US Pat. No. 9,809,118

SYSTEM AND METHOD FOR PARALLEL POWER SUPPLY CONTROL FOR AUXILIARY CONVERTERS OF MOTOR TRAIN UNIT IN PRESENCE OF INTERCONNECTING LINES

CRRC QINGDAO SIFANG ROLLI...

1. A method for controlling a system for parallel power supply control for auxiliary converters of a motor train unit in the
presence of interconnecting lines, the system for parallel power supply control for auxiliary converters of the motor train
unit in the presence of interconnecting lines comprising multiple three-phase inverter modules in parallel connection with
each other, wherein any two-phase circuit of a three-phase inverter module is separately in parallel connection with a corresponding
two-phase circuit of a three-phase inverter module adjacent to the three-phase inverter module by using a connecting line
module, the connecting line module is connected to a control system, each of the three-phase inverter modules is also connected
to the control system, the three-phase lines of each the three-phase inverter modules are all provided with switches; and
the connecting line module comprises a current transformer which is in parallel connection with two ends of a certain phase
circuit, the current transformer is in parallel connection with a voltage resistor and is connected in series with a current
sensor, and any two adjacent connecting line modules are in parallel connection; and the current transformer is connected
to the control system; wherein the method comprises the following steps:
(1) the current transformer finishes adjusting phase-circuit current of the three-phase inverter module, and adjusts larger
current to be small current whose signal is easier to be used by the control system;

(2) the current sensor collects current of the three-phase inverter module, including current phase and amplitude, and sends
the collection result to the control system; and

(3) the control system gathers the collected current value, and compares the phases and amplitudes of the current value of
the same phase circuit of any two adjacent three-phase inverter modules, when the phases and amplitudes of the current of
the same phase circuit of any two adjacent three-phase inverter modules are unequal, the control system calculates the difference
of the phases and that of the amplitudes, and controls the two inverter modules for automatic current sharing according to
the calculation result until the phases and amplitudes of the current of the two adjacent three-phase inverter modules are
equal; and the control system executes the same operation as above on two parallel phase circuits of two adjacent three-phase
inverter modules.

US Pat. No. 9,669,732

TRACTION CONTROL SYSTEM FOR ELECTRIC MULTIPLE UNITS

CRRC QINGDAO SIFANG ROLLI...

1. A traction control system for electric multiple units, provided to control the operation of inverter power module and four-quadrant
power module of a traction converter for electric multiple units, mainly comprising a power supply module, inverter/four-quadrant
modules, an I/O module, a network module and a debugging module, wherein,
the inverter/four-quadrant modules each mainly consist of a fast computing board, a signal sampling board and a pulse interface
board,

the signal sampling board is mainly configured to receive signals from an external sensor, receive pulse feedback signals
sent by the pulse interface board and receive control signals sent by the fast computing board, and send pulse signals to
the pulse interface board, send processed acquisition signals to the fast computing board, and send relay control signals
to the I/O module;

the fast computing board is mainly configured to receive analog signals and digital signals acquired and processed by the
signal sampling board and receive control signals sent by a host processor, and send control signals to the signal sampling
board and send processing signals to the network module;

the pulse interface board can be connected to two groups of inverter power modules and two groups of four-quadrant power modules
at most;

the pulse interface board is mainly configured to receive IGBT status signals sent by the inverter power module and four-quadrant
power module and receive IGBT control signals sent by the signal sampling board, and send the IGBT status signals to the signal
sampling board and send the IGBT control signals to the inverter power module and four-quadrant power module;

bidirectional communication between the signal sampling board and the fast computing board is realized by a high-speed differential
LinkPort bus;

bidirectional communication between the signal sampling board and the I/O module is realized by a high-speed bus;
bidirectional communication between the fast computing board and the host processor, between the network module and the host
processor, and between the debugging module and the host processor are realized by a CPCI bus;

bidirectional communication between the I/O module and the inverter/four-quadrant modules is realized by a high-speed bus;
bidirectional communication between the I/O module and the network module, between the I/O module and the debugging module
are realized by a CAN bus;

the network module comprises a network board, and the network module receives digital signals and analog signals sent by the
I/O module and transfers the digital signals and the analog signals to the host processor via the CPCI bus; receives command
signals from the host processor via the CPCI bus, and sends commands to the I/O module to control the I/O module to output
analog signals and analog signals; controls data interaction between an MVB interface unit and an external MVB bus; and sends
MVB data to the host processor via the CPCI bus, and sends data to be sent by the host processor to the MVB interface unit
via the CPCI bus;

the debugging module comprises a debugging board; the debugging module receives debugging commands and debugging signals sent
by the host processor via the CPCI bus; the debugging module receives debugging signals sent by the signal sampling board
via a high-speed bus; and,

the power supply module supplies power to the inverter/four-quadrant modules, the I/O module, the network module and the debugging
module.

US Pat. No. 9,616,904

TELESCOPIC MECHANISM IN TELESCOPIC HITCH BUFFER DEVICE FOR USE IN HIGH SPEED ELECTRIC MULTIPLE UNITS

CRRC QINGDAO SIFANG ROLLI...

1. A telescopic mechanism in a telescopic hitch buffer device for use in high speed electric multiple unit (EMU) trains, wherein
the telescopic mechanism comprises a compression rod (2) located inside a movable housing (1) of said hitch buffer device, one end of said compression rod (2) being connected to the movable housing (1), and a bearing connector (3) encasing the compression rod (2); a guiding barrel (4) is fixedly mounted outside the bearing connector (3); an extension/retraction driving mechanism (9) is provided between the guiding barrel (4) and the movable housing (1); one end of the compression rod (2) is connected to the movable housing (1) via a torsion spring (5), for keeping the compression rod (2) and the bearing connector (3) in a locked state; a locking mechanism comprises protrusions (6) distributed at another end of the compression rod (2), and grooves (7) in engagement with the protrusions (6) on the inner wall of the bearing connector (3); the locking mechanism is in an unlocked state when the protrusions (6) face the grooves (7), both the compression rod (2) and the bearing connector (3) can slide relative to each other; an unlocking driving mechanism (8) is provided on the outside of the movable housing (1).

US Pat. No. 9,540,221

SELF-ADJUSTING SUPPORTING HEAD

CRRC QINGDAO SIFANG ROLLI...

1. A self-adjusting supporting head, comprising a vehicle body lifting column (10) and a load-bearing detection device arranged on the vehicle body lifting column (10), the load-bearing detection device comprises a spring supporting plate (5), a spring (6), a limiting switch tip (8), a load limiting switch (9) and a floating load-bearing adjusting device, the floating load-bearing adjusting device is mounted at the top of the vehicle
body lifting column (10) and the spring supporting plate (5) is arranged below the floating load-bearing adjusting device, the spring (6) is mounted on the periphery of the spring supporting plate (5), the upper end of the limiting switch tip(8) is connected to the spring supporting plate (5) and on the low end side is provided with a load limiting switch (9), wherein the floating load-bearing adjusting device comprises a floating load-bearing block (1), a floating load-bearing mounting base (2) and a floating connector, the floating load-bearing block (1) is mounted at the upper end of the vehicle body lifting column (10), the floating load-bearing block mounting base (2) is mounted below the floating load-bearing block (1), the floating load-bearing block (1) is connected with the floating load-bearing block mounting base (2) by a floating connector, and the floating load-bearing block(1) is in spherical fit with the floating load-bearing block mounting base(2), a floating gap is formed by the floating connector between the floating load-bearing block (1) and the floating load-bearing block mounting base (2).

US Pat. No. 9,828,009

HAND BRAKE

CRRC QINGDAO SIFANG ROLLI...

1. A hand brake, comprising a hand wheel (4), a chain (5), an enclosure (1), a drive shaft assembly (3) which is disposed in the enclosure (1), a bull gear (13), and a base assembly (6); wherein the hand wheel (4) is connected to the drive shaft assembly (3), one end of the chain (5) is fixed to the bull gear (13), and a main shaft of the bull gear (13) is a chain winding shaft (2), the base assembly (6) comprises a base (22); wherein the hand brake further comprises a limiting device disposed on the chain winding shaft (2) between the bull gear (13) and the base (22); the limiting device comprises a first bearing (10), a torsion spring holder (12), a torsion spring (11), a guide plate (9), and a guide plate holder (23); the torsion spring (11) is sleeved on outside of the first bearing (10), the torsion spring holder (12) is disposed at a first side of the torsion spring (11) close to the bull gear (13); the guide plate (9) and the guide plate holder (23) are successively disposed at a second side of the torsion spring (11) close to the base (22); a first stopper post (8) is secured to a side of the guide plate (9) facing the torsion spring (11); a second stopper post (26) is secured to a side of the base (22) facing the guide plate holder (23); a third stopper post (7) is secured to a side of the torsion spring holder (12) facing the torsion spring (11); both ends of the torsion spring (11) are curved hooks, the guide plate (9) and the guide plate holder (23) are of an annular structure; an arcuate groove is provided on the guide plate (9) that passes through the guide plate (9), and a hole matching with the second stopper post (26) in size is arranged on the guide plate holder (23), and the second stopper post (26) passes through the guide plate holder (23) via the hole and slides in the arcuate groove.

US Pat. No. 10,088,387

BRAKE BEAM FATIGUE TEST STAND

CRRC QINGDAO SIFANG ROLLI...

1. A brake beam fatigue test stand, for simultaneously testing a fatigue strength of two brake beams, comprising: a base, and four upright columns vertical to the base and arranged on the base at intervals; wherein, from a left side to a right side of the base successively, there are a first upright column, a second upright column, a third upright column and a fourth upright column, wherein,a first tangential load actuator capable of applying a tangential load is mounted vertically between the first upright column and the second upright column, with simulated wheels being mounted on a front side and a rear side of a bottom of the first tangential load actuator;
a pressure load actuator capable of applying a pressure load is mounted vertically between the second upright column and the third upright column;
a second tangential load actuator capable of applying a tangential load is mounted vertically between the third upright column and the fourth upright column, with simulated wheels being mounted on a front side and a rear side of a bottom of the second tangential load actuator; the second tangential load actuator and the first tangential load actuator are symmetrically arranged by taking the pressure load actuator as a center; and,
the two brake beams are uprightly mounted on a front side and a rear side of the upright columns, with two ends of the brake beam being supported on treads of the simulated wheels.

US Pat. No. 9,527,708

SEGMENTED INVERTING COVER PLATE APPARATUS FOR UNDERFLOOR VEHICLE LIFTING JACK

CRRC QINGDAO SIFANG ROLLI...

1. A segmented inverting cover apparatus for an underfloor vehicle lifting jack, comprising:
a cover, wherein the cover comprises a first movable cover plate and a second movable cover plate, the first movable cover
plate and the second movable cover plate are pivotly connected to each other via a first pin shaft;

an anti-inversion block being directly below the first pin shaft when the cover is in a horizontal closed position, the anti-inversion
block being mounted to a lower surface of the second movable cover plate; and

an inverting arm positioned below the first movable cover plate when the cover is in the horizontal closed position, wherein
one end of the inverting arm is slidably connected with the anti-inversion block, another end of the inverting arm is connected
to a powered push rod, and the inverting arm is also slidably connected to the first movable cover plate;

wherein the anti-inversion block has two side blocks extending parallel to one another and defining a first elongated hollow
groove therebetween which extends in a direction perpendicular to the first pin shaft and slidably receives said one end of
the inverting arm.

US Pat. No. 10,097,024

CONTROL SYSTEM AND CONTROL METHOD FOR A PHASE SHIFTED FULL BIDGE CHARGER

CRRC QINGDAO SIFANG ROLLI...

1. A control method for a phase shifted full bridge charger using a control system as below:the control system comprising a sampling system and a charger controller; wherein, the sampling system comprises an input voltage acquisition device mounted at an input terminal of the charger to acquire an input voltage, a total output voltage acquisition device and a total output current acquisition device both mounted at an output terminal of the charger to respectively acquire a total output voltage and a total output current, and a charging current acquisition device mounted at an input terminal of a storage battery to acquire a charging current;
the charger controller comprising:
a start and running determination unit configured to receive a total output voltage signal, a total output current signal, a charging current signal and a duty ratio, and determine whether the charger operates in a waiting state, a pre-charging state, a soft start state or a running state, and generate a corresponding state signal; and the running state comprises a constant-voltage running state, a total-current-limiting running state and a charging-current-limiting running state;
a soft start control unit configured to control the charger during the soft start state of the charger;
a running control unit configured to control the charger in the running state of the charger and determine the running state of the charger;
the running control unit comprising:
a mode determination unit configured to receive a total output voltage value, a total output current value and a charging current value, to determine which running state the charger operates in, and to generate a running state signal of the charger;
a constant-voltage control unit configured to control the charger when the charger operates in the constant-voltage running state;
a total-current-limiting control unit configured to control the charger when the charger operates in the total-current-limiting running state;
a charging-current-limiting control unit configured to control the charger when the charger operates in the charging-current-limiting running state;
the charger controller further comprises a smooth switchover control unit configured to receive the running state signal of the charger fed back by the mode determination unit, and a soft start state signal fed back by the start and running determination unit;
when the charger is switched between the soft start state and the running states, the control system is smoothly switched a control unit corresponding to the soft start state or the three running states of the running control unit to control a PSFB circuit connection of the charger;
the control method comprising the following steps:
determining whether the pre-charging of the charger ends; if so, the charger comes into the soft start state, and an operation of the charger is controlled by the soft start control unit;
determining whether the soft start of the charger ends; if so, the charger comes into the running state, the running control unit operates, and the smooth switchover control unit allows that a control is switched to the constant-voltage control unit;
receiving, by the mode determination unit, the total output voltage value, the total output current value and the charging current value; a total output current limiting value; and configuring, for the mode determination unit, a set value of the charging current, a total output current limiting value, a charging current limiting value, and a reference value of the total output voltage; determining the running state of the charger by the above received values and set values; and feeding an instruction for the running state of the charger back to the smooth switchover control unit;
in the constant-voltage running state, a constant-voltage control algorithm is used, however,
when

 the charger comes into the total-current-limiting running state, and the smooth switchover control unit controls the switchover to the total-current-limiting control unit; otherwise, when

 the charger comes into the charging-current-limiting running state, and the smooth switchover control unit controls the switchover to the charging-current-limiting control unit; otherwise, the charger is still in the constant-voltage running state;
in the charging-current-limiting running state, a charging-current-limiting control algorithm is used, however,
when

 the charger comes into the constant-voltage running state, and the smooth switchover control unit controls the switchover to the constant-voltage control unit; otherwise, when

 the charger comes into the total-current-limiting running state, and the smooth switchover control unit controls the switchover to the total-current-limiting control unit; otherwise, the charger still operates in the charging-current-limiting running state;
in the total-current-limiting running state, a total-current-limiting control algorithm is used, however,
when

 the charger comes into the constant-voltage running state, and the smooth switchover control unit controls the switchover to the constant-voltage control unit; otherwise, when

 the charger comes into the charging-current-limiting running state, and the smooth switchover control unit controls the switchover to the charging-current-limiting control unit; otherwise, the charger still operates in the total-current-limiting running state;
in the above formulas, Vout denotes the total output voltage value, Iout denotes the total output current value, Iout-ref denotes the total output current limiting value, Ibat denotes the charging current value, Ibat-ref denotes the charging current limiting value, and Vref denotes the reference value of the total output voltage.

US Pat. No. 9,932,053

HAND BRAKE LIMITING DEVICE

CRRC QINGDAO SIFANG ROLLI...

1. A hand brake limiting device, comprising a bearing I (10), a spring (11), a spring holder (12), one or more guide plate (9) and a guide plate holder (23), wherein the bearing I (10) is disposed on the spring holder (12) and the spring is sleeved on the outside of the bearing I (10), the one or more guide plate (9) and the guide plate holder (23) are disposed successively at one side of the spring away from the spring holder (12); a stopper post III (7) is secured to one side of the spring holder (12) facing the spring, a stopper post I (8) is respectively secured to one side of each of the one or more guide plate (9) facing the spring (11), a stopper post II (26) is secured to one side of the guide plate holder (23) facing the one or more guide plate (9); two ends of the spring are in curved shape, each of the one or more guide plate (9) is respectively provided with an arcuate groove that penetrates each of the one or more guide plate (9); the number of guide plates (9) is n, 1?n?10; when n?2, the stopper post I on the nth guide plate (9) rotates in the arcuate groove of the n?1th guide plate with the n?1th guide plate being adjacent to the nth guide plate (9) and closer to the spring; and the stopper post II (26) rotates in the arcuate groove of the nth guide plate.

US Pat. No. 10,056,985

BROADBAND COMMUNICATION NETWORK ARCHITECTURE WITH TRAIN CONTROL NETWORK AND TRAIN SERVING NETWORK COMBINED, AND COMMUNICATION METHOD THEREOF

CRRC QINGDAO SIFANG ROLLI...

1. A broadband communication network on-board a train shared by a train control network and a train serving network, the broadband communication network, used for co-network data transmission of the train control network and the train serving network, comprising a trusted network and an untrusted network; wherein:the trusted network comprises a plurality of trusted carriage-level network elements and a plurality of trusted train-level network elements, each middle carriage of the train and each of a front carriage and a last carriage of the train are provided with at least one trusted carriage-level network element, one trusted train-level network element is provided in each of the front carriage and the last carriage, respectively, the trusted carriage-level network element communicates with the trusted train-level network element; data transmitted in the trusted network comprises control data, monitored data and diagnostic information data in the train control network, and passenger information data and video information data in the train serving network;
the untrusted network comprises untrusted train-level network elements respectively provided in the front carriage and the last carriage; the trusted train-level network element in the front carriage communicates with the untrusted train-level network element in the front carriage via a first security gateway provided in the front carriage, the trusted train-level network element in the last carriage communicates with the untrusted train-level network element in the last carriage via a second security gateway provided in the last carriage, and the first and the second security gateways are redundant to each other; the untrusted network is responsible for a connection between the train and a ground;
data to be transmitted between the trusted network and the untrusted network is communicated bi-directionally between the trusted train-level network elements and the untrusted train-level network elements via the first or the second security gateway.

US Pat. No. 10,246,110

HEAVY FREIGHT TRAIN MARSHALLING DEVICE AND MARSHALLING METHOD, AND ELECTRONICALLY CONTROLLED PNEUMATIC BRAKE SYSTEM

CRRC QINGDAO SIFANG ROLLI...

1. A heavy freight train marshalling device, comprising a Head End Unit (HEU) and a plurality of carriage control units, wherein,the HEU is communicated with each of the carriage control units;
each carriage control unit comprises a carriage control module, and a Beidou positioning module and a communication module respectively connected with the carriage control module;
a first-vehicle identification terminal is further provided in the carriage control unit working as a first vehicle;
the carriage control module acquires first-vehicle state data via the first-vehicle identification terminal;
the Beidou positioning module is configured to acquire latitude and longitude data of the corresponding carriage control unit; and,
the carriage control mode receives, via the communication module, a command transmitted by the HEU, and transmits, to the HEU and via the communication module, the latitude and longitude data of the carriage control unit read from the Beidou positioning module and the first-vehicle state data of the carriage control unit;
wherein a calculation module for calculating the distance between the carriage control units is provided in the HEU.

US Pat. No. 10,203,962

TIGERSHARC DSP BOOT MANAGEMENT CHIP AND METHOD

CRRC QINGDAO SIFANG ROLLI...

1. A DSP boot management chip, comprising an interface unit, a two-port RAM unit, a management unit and a DSP download management unit; whereinthe interface unit is connected to the two-port RAM unit and the management unit, respectively;
the management unit is connected to an external control system via a control line, and the management unit is further connected to the two-port RAM unit and the DSP download management unit, respectively;
the DSP download management unit is connected to at least one DSP chip via a parallel bus;
the DSP boot management chip further comprises a flash drive unit and a NOR flash chip; the management unit is connected to the flash drive unit; the two-port RAM unit is connected to the NOR flash chip via the flash drive unit; and, the NOR flash chip is communicated with the DSP download management unit via the flash drive unit;
the management unit is configured to perform control to the selection of downloading a DSP boot program via the interface unit by an external bus, or perform control to the selection of downloading the DSP boot program by the NOR flash chip, and the management unit is configured to perform control to the selection of booting via the NOR flash chip or via an external bus;
the management unit is further configured to, when selecting to boot via the NOR flash chip, drive the NOR flash chip to download the DSP boot program via the flash drive unit, so that the DSP boot program is stored into the NOR flash chip, and the DSP chip reads the DSP boot program in the DSP boot management chip via the DSP download management module; and
when selecting to boot via the external bus, the DSP boot program is transferred to the DSP chip via the two-port RAM unit and the DSP download management unit.

US Pat. No. 10,189,489

OFFLINE VARIABLE MONITORING SYSTEM AND METHOD FOR MPUS OF AN EMU TRAIN

CRRC QINGDAO SIFANG ROLLI...

1. An offline variable monitoring system for central control units of an electric multiple unit train, comprising a main control unit, a serial port unit, an Ethernet interface, a TF card interface and a status indicator, wherein the serial port unit, the Ethernet interface, the TF card interface and the status indicator are all electrically connected to the main control unit; the serial port unit comprises four serial ports which are separately connected to four central control units of the electric multiple unit train; the main control unit is connected to a PC via the Ethernet interface, and a configuration software corresponding to the monitoring system is provided inside the PC; and the main control unit is connected to a TF expansion card via the TF card interface, an MAP file and a configuration file are stored in the TF expansion card, and the main control unit records monitored offline variable values into the TF expansion card; wherein the offline variable values are real-time logic control variables, and are able to be recorded into the TF expansion card for downloading and storing.

US Pat. No. 10,147,292

TRAIN SMOKE AND FIRE ALARM COMMUNICATION METHOD BASED ON INDEPENDENT MODULES COMBINATION AND 3U CHASSIS STRUCTURE

CRRC QINGDAO SIFANG ROLLI...

1. A train smoke and fire alarm communication method based on independent modules combination and a 3U chassis structure, comprising the following steps:externally connecting a carriage number connector X4 of an IO (Input and Output) board to an address line to identify a carriage number, and invoking a detector configuration;
acquiring, by detectors, temperature information and smoke concentration information in an ambient environment of each detector, and transmitting the acquired temperature information and smoke concentration information to a CPU (Central Processing Unit) board to be processed;
by the CPU board, determining the acquired temperature information and smoke concentration information, outputting alarm information when the temperature or the smoke concentration exceeds a set threshold, and transmitting the alarm information to an HMI (Human Machine Interface) display screen in a cab via a train network;
after the alarm, interrupting signals output between the 10 board and a train safety loop, and transmitting the alarm information to the HMI display screen in the cab, and lightening a red alarm indicator on the DISP board corresponding to the detector giving the alarm; and
by a DS (Data Storage) board, collecting and storing the temperature information, the smoke concentration information and the alarm information;
by an Enet (Ethernet) board, collecting the temperature information, the smoke concentration information and the alarm information, as well as communication state of each board and storing states, and connecting the information on a switch by an Ethernet; and, by a wireless board, uploading the information to a cloud server;
the detectors include CAN (Control Area Network) interface detectors or FSK (Frequency-shift Keying) interface detectors; and the detectors transmit the acquired temperature information and smoke concentration information to the CPU board through a CAN board or an FSK board, respectively, to be processed;
the communication mechanism between the detectors and the CAN board or the FSK board is a group transmission-response mechanism, and the group command transmission-response mechanism comprises two processes, that is, group command transmission and group command response;
the process of transmitting a group command from the CAN board to the detectors FSD (Fire Smoke Detector) adopts a command frame address increment algorithm; the CAN board transmits a command frame via its port CAN#0, and a first detector FSD1 receives the command frame from the CAN board and forwards; when forwarding, the first detector FSD1 performs address increment processing on the command frame address to calculate a new command frame address, and transmits the new command frame address to a next detector FSD;
in the group command response process, the nth detector FSDn transmits and forwards a response slave command frame address of the detector at this node via its port CAN#1, and receives response frame IDs from other detectors via its port CAN#0; when forwarding the response slave command frame address of the detector at this node, the nth detector FSDn performs address increment processing on the slave command frame address to calculates a new slave command frame address, and transmits the new slave command frame address to a previous detector FSD.

US Pat. No. 10,480,551

TRACTION CONTROL SYSTEM FOR ELECTRIC MULTIPLE UNITS

CRRC QINGDAO SIFANG ROLLI...

1. An oil tank ventilation device for a hydraulic brake unit of a tramcar, comprising a vent plug, a sealing ring, a gas guide hole and a gas guide pipe; wherein the gas guide hole is a through-hole structure arranged at an upper end inside an integrated valve block; the vent plug is arranged inside an electrical element protection case, and performs gas exchange from an outside through a harness hole provided on the electrical element protection case; the vent plug is mounted in the gas guide hole on the integrated valve block which is on one side of an interior of the electrical element protection case, and the vent plug is coaxial with the gas guide hole and is communicated with an inner chamber of the integrated valve block through the gas guide hole; the sealing ring is mounted at a junction of the vent plug and the integrated valve block; and, one end of the gas guide pipe is mounted with the gas guide hole on the integrated valve block which is on one side of an interior of an oil tank, while another end of the gas guide pipe is stretched into an air chamber above the interior of the oil tank, and the gas guide pipe is coaxial and communicated with the gas guide hole.

US Pat. No. 10,345,197

LOADING TEST TEST-AND-CONTROL SYSTEM AND METHOD OF VEHICLE LIFTER LIFTING UNIT

CRRC QINGDAO SIFANG ROLLI...

1. A loading test test-and-control system of vehicle lifter lifting unit, comprising a base, wherein,the base is provided thereon with a support bracket;
the support bracket is provided with a loading unit for applying a loading force to a lifting unit to be tested;
the loading unit is electrically connected with a control unit which controls a pressure applied by the loading unit according to a set value;
the lifting unit to be tested is directly mounted on the base; and the lifting unit to be tested comprises a support head and a vertical support column;
the support bracket comprises a first support column and a second support column, both of which are provided on the base; a horizontal beam is provided between the first support column and the second support column; the lifting unit to be tested is positioned between the first support column and the second support column, and is positioned below the horizontal beam; the loading unit is mounted on the horizontal beam and positioned between the horizontal beam and the lifting unit to be tested;
the loading unit comprises a hydraulic cylinder, a fixed end of the hydraulic cylinder is mounted on the support bracket and below the horizontal beam, a piston end of the hydraulic cylinder and a joint provided at a lower end of the piston end are at a side close to the lifting unit to be tested; a bottom of the piston end of the hydraulic cylinder is provided with a pressure sensor capable of detecting loading pressure of the hydraulic cylinder, the pressure sensor is positioned below the joint, and the pressure sensor is connected to the control unit to transmit a pressure signal sensed by the pressure sensor to the control unit; the joint and the pressure sensor are movably connected via a connecting member.

US Pat. No. 10,655,381

LOCKING DEVICE AND OPENING AND CLOSING MECHANISM HAVING THE SAME

CRRC QINGDAO SIFANG ROLLI...

1. An opening and closing mechanism comprising a locking device, a baseplate, a fairing, a support arm, and a powered push cylinder, wherein:the locking device comprises:
a casing, the casing comprising a first end having a hole and a second end having an opening;
a rod provided within the casing, wherein the rod passes through the hole and extends out of the casing such that a first end portion of the rod is positioned outside the casing, and a fastener is provided on the on the first end portion;
a raised member located outside the casing and provided at a second end portion of the rod, the raised member having a diameter greater than a diameter of the opening, and a gap being formed between the raised member and the casing, wherein when the raised member moves relative to the casing along an axial direction of the rod, a dimension of the gap changes;
a spring sleeved on the rod, wherein when the gap is reduced to zero, the spring on the rod is in a compressed state; and
a first shaft provided on the raised member; and a second shaft provided on the casing adjacent to the first end of the casing;
the locking device is rotatably mounted on the baseplate by the second shaft;
a third shaft is provided on the baseplate; a first end of the support arm is rotatably sleeved on the third shaft, and a second end of the support arm is connected to the fairing by a fairing mounting base;
a sliding groove in which the first shaft of the locking device is slidably located is formed on the support arm; the locking device is connected to a piston rod of the powered push cylinder, such that the piston rod can push the locking device to rotate with respect to the baseplate, and the first shaft slides in the sliding groove to cause the support arm to push the fairing mounting base to open or close the fairing; and
the opening and closing mechanism is further provided with a closed-state limit stop to prevent the fairing from moving beyond a closing position and an open-state limit stop to prevent the fairing from moving beyond a maximal opening position.

US Pat. No. 10,611,386

THREADED INTERFACE BUFFER WITH ANTI-ROTATION STRUCTURE

CRRC QINGDAO SIFANG ROLLI...

1. A threaded interface buffer with anti-rotation structure, comprising a buffer housing, a buffer capsule and a drawbar; wherein,the drawbar comprises a connection portion connected to the buffer capsule;
the drawbar is in threaded connection to the buffer capsule through the connection portion;
a first level anti-rotation structure, for limiting the relative rotation of the drawbar and the buffer capsule, is mounted on the drawbar and the buffer capsule;
a second level anti-rotation structure, for limiting the relative rotation of the drawbar and the buffer housing, is mounted between the drawbar and the buffer housing, the second level anti-rotation structure comprises an anti-rotation plate; one end of the anti-rotation plate is connected to the drawbar, the other end of the anti-rotation plate is connected to the buffer housing.