91results about How to "Guaranteed normal braking" patented technology

The invention discloses an intelligent deep hole rope winch driven by a variable frequency motor. The intelligent deep hole rope winch comprises the variable frequency motor, a winch rack, a roller rack, a hydraulic disk brake, a rope arranging mechanism and a monitoring system. The variable frequency motor and the roller rack are arranged on the left side and the right side of the winch rack respectively; the roller rack is horizontally provided with a winch central shaft which is connected with the roller rack through a bearing, and the inside of the roller rack is provided with a roller which is connected with the radial outside of the winch central shaft; the left end of the winch central shaft extends out of the roller rack and is connected with the driven plate of an electromagnetic clutch through a connection board, the output shaft of the variable frequency motor is connected with the input shaft of a reducer gearbox, and the output shaft of the reducer gearbox is connected with the driving plate of the electromagnetic clutch through a shaft sleeve; the rope arranging mechanism is arranged above the roller rack, and ropes are wound onto the roller through the rope arranging mechanism; the monitoring system comprises a rope length and rope speed sensor, a tension testing mechanism and a monitoring computer. The intelligent deep hole rope winch driven by the variable frequency motor has the advantages of high efficiency, safety, intelligent control, energy saving and environmental protection.

The invention discloses a trailer control valve which comprises a valve body with an inner cavity. A travel brake cavity, a large piston return cavity, a booster cavity, an air outlet cavity and a parking cavity are formed in the inner cavity of the valve body from top to bottom in sequence, an air inlet, an air supply opening, an air outlet, an exhaust port, a travel control opening and a parking control opening are communicated with the inner cavity of the valve body and are formed in the valve body, a pressure increasing valve, a pressure reducing valve and a pressure preparing valve which are communicated with one another are arranged on the valve body, the air inlet is communicated with an air cylinder of a motor tractor, the air supply opening is communicated with the air inlet through a throttling valve and outputs air pressure to an energy supply pipeline of a trailer, the air outlet is communicated with the air inlet through a combined valve, and the combined valve is a normally-closed valve and is controlled by the travel control opening / the parking control opening. Double-loop control of electric control signals and air control signals is adopted, the electrical control over the trailer control valve is achieved, the defect that in the traditional air pressure control process, due to the fact that the pipeline is long, air pressure signals are slow to transmit is overcome, and the vehicle brake response time is shortened.

The invention relates to a valve assembly (7) for a trailer braking assembly (1) for a commercial vehicle. The valve assembly (1) comprises a supply port (15), a spring-loaded port (28), and a manual actuating element (38). An emergency braking- and / or uncoupling function is integrated in the valve assembly (7) and causes automatic exhaust of the spring-loaded port when the supply port is not under pressure. According to the valve assembly, the only manual actuating element (38) can be actuated to perform pressure loading and exhaust upon the spring-loaded port (28) when a supply port (28) is pressurized or not under pressure. Therefore, the manual actuating element (38) can be used in multiple functions, and can not only ensure a parking function of a traditional parking valve, but also ensure a release function of a traditional release valve.

The invention provides a rack type safe brake device for an electromagnetic lever of lifting equipment. A movable rack can horizontally move or can be kept on certain designated position on a rail component; after entering a brake state, the top of the movable rack is directly contacted with the main bearing structure of a cage of the lifting equipment or is contacted with bearing through an intermediate transition bearing part; an operation mechanism of the movable rack is used for operating the movable rack to horizontally move or stay on certain designated position on the rail component; and the designated position includes a brake position meshed with a driving rack of the lifting equipment or a free position which is completely separated from the driving rack of the lifting equipment at an interval. An electromagnetic lever is adopted to control the rack meshing mode for safe protection brake, and the beneficial effects of saving energy, remarkably improving the levelling accuracy and safely protecting the brake quality can be achieved.

The invention provides a robot joint and a robot with the robot joint. The robot joint comprises a first joint body, a second joint body, a drive device and a seal assembly. The first joint body is provided with a storage cavity and an installing hole communicating with the storage cavity, and the storage cavity is used for storing lubricating media. The second joint body is movably connected withthe first joint body. The drive end of the drive device penetrates through the installing hole and is in drive connection with the second joint body so that the drive end can be used for driving thesecond joint body to move. The seal assembly is located between the hole wall of the installing hole and the outer surface of the drive end so as to seal the connected position of the installing holeand the drive end. The robot joint and the robot effectively solve the problem that in the prior art, lubricating oil located in a robot joint is likely to enter a motor, and consequently normal usageof the motor is influenced.

The invention provides a control device of a vacuum servo braking system and an automobile. The vacuum servo braking system comprises at least two vacuum pumps and at least two vacuum pressure sensors. The control device comprises a power supply control module, a processor, and pressure signal collecting modules separately connected to the vacuum pressure sensors correspondingly and vacuum pump signal collecting modules and control signal output modules separately connected to the vacuum pumps correspondingly, wherein the processor determines the vacuum pressure value of the vacuum servo braking system by acquiring the pressure sensing signals of the vacuum pressure sensors and controls the vacuum pumps to start or stop according to the vacuum pressure value; and the processor acquires the working state signals of the vacuum pumps, and controls corresponding vacuum pumps to stop when the corresponding vacuum pumps are in fault states. The control device provided by the invention guarantees normal braking of the vacuum servo braking system by means of fault detection and execution of corresponding control policies, so that the safety performance of the whole automobile is improved.

The invention discloses an air brake pressure control system and a brake control method. The system comprises an air inflation electromagnetic valve, an exhaust electromagnetic valve, a pressure sensor, a detection module, a pressure control unit and a controller, wherein controller comprises a learning record module and an abnormal control module. According to the brake control method, a synchronous learning and a recording control strategy of the learning record module is utilized, when signals of the pressure sensor are abnormal, the abnormal control module calls the control strategy of thelearning record module, and the air inflation electromagnetic valve or the exhaust electromagnetic valve is controlled to gradually reach the target pressure according to the corresponding control strategy. Compared with a certain fixed state that a control electromagnetic valve is in the normal power or normal power loss, the pressure of a pressure chamber to be controlled is more accurate.

The invention discloses a brake control system of a railway vehicle. The brake control system comprises bullet train brake subsystems in one-to-one correspondence with multiple section of bullet trains on a railway vehicle, each bullet train brake subsystem comprises: a traction control device, which is used for receiving a brake signal, outputting an electric braking force corresponding to the brake signal, and outputting an auxiliary brake signal when the electric braking force does not meet the braking force requirement corresponding to the brake signal; a spring brake device, which is usedfor outputting a braking force corresponding to an auxiliary brake signal when the auxiliary brake signal is received, and is also used for outputting a braking force corresponding to the brake signal when receiving the brake signal. When the braking force provided by the traction control device is insufficient, the spring brake device applies a passive hydraulic braking force to supplement the braking force lacking in the traction control device, the stress of a car coupler is reduced, and the service life of the car coupler is guaranteed. The invention further discloses a rail vehicle, which has the above beneficial effects.

The invention discloses an integrated electronic hydraulic braking system and method, and belongs to the technical field of automobile braking systems. The braking system adopts a mode that a linear motor directly drives a braking master cylinder to control hydraulic pressure of the system, and the linear motor and the braking master cylinder are integrated to serve as a power source of the braking system; under a conventional braking mode, the motion of the linear motor is controlled, so that pressure in a brake wheel cylinder can be quickly and accurately adjusted, high-pressure energy storage devices such as a high-pressure energy accumulator and a hydraulic pump are eliminated, and a mode that the linear motor replaces a rotating motor to be combined with a transmission mechanism is adopted, so that the influence of mechanical friction on the system process is reduced; when the motor fails or the system loses power, braking performance of an automobile can still be realized by a driver stepping on a brake pedal, and thus the reliability of the braking system is ensured; and an anti-lock braking function is integrated to improve the active safety performance of the braking system.

The invention relates to a solar tracking power generation device with adaptive illumination angle adjustment. The solar tracking power generation device comprises a photovoltaic cell panel angle / orientation adjustment module, a heat dissipation module, a cleaning module, a sunlight detection module, a control module and a lithium battery charging-discharging module; wherein, the photovoltaic cellpanel angle / orientation adjustment module is disposed on the circular track of the sunlight detection module; the heat dissipation module, the cleaning module and the control module are fixed to thephotovoltaic cell panel angle / orientation adjustment module; and the lithium battery charging-discharging module is fixed under the sunlight detection module. The solar tracking power generation device improves the power transmission efficiency of photoelectric conversion, provides a cleaning device to ensure the cleanliness of a photovoltaic cell panel, a support table and the circular track. Thus, not only does the sunlight vertically irradiate the photovoltaic cell panel all the time, but also each appliance is in an optimal working condition.

The invention provides a brake device supporting rail-compatible running of a trapped rail car. The brake device comprises a frame, oil cylinders and disc springs and further comprises lifting block and hook swing mechanisms, wherein the oil cylinders, the disc springs and the lifting block and hook swing mechanisms are arranged in the frame, and the disc springs are arranged on the lower portions of the oil cylinders. Each lifting block and hook swing mechanism comprises a pressing block assembly, a lifting block assembly and a hook swing part, wherein the pressing block assembly comprises a flange, a rod part and an upper friction block, the lifting block assembly comprises a brake hook and a lower friction block, and the hook swing part comprises a swing plate, a lug fork, a tension spring, a lug plate, a guide wheel and a stud. The guide wheels are attached to the outer side faces of rails; and the peripheries of the studs are sleeved with the guide wheels, and the guide wheels can freely rotate around the central lines of the studs. On the basis of an original brake device, one lifting block and hook swing mechanism is additionally arranged. When the trapped rail car runs, the mechanisms perceive rail changes through the guide wheels and drive the brake hooks to be opened or closed, and therefore collision of the brake hooks and connecting clamping plates is avoided, it is ensured that the trapped rail car can run in a rail-compatible manner, and the trapped rail car can be braked on special-shaped rails.

The invention provides a strong breeze resisting minitype wind driven generator which comprises a generator main shaft, a blade, a shell, a generator rotor and a generator stator, wherein the blade is fixed on the generator main shaft; the shell supports the generator main shaft through a bearing; the shell comprises a stator shell, a front end cover which is positioned at the front end of the stator shell and a rear end cover which is positioned at the rear end of the stator shell; the generator rotor is positioned in the shell and fixed on the generator main shaft; the generator stator is fixed on the inner surface of the stator shell of the shell, corresponding to the generator rotor. The wind driven generator is characterized by also comprising a controller and a mechanical electromagnetic brake which are connected, wherein the mechanical electromagnetic brake is installed on the generator main shaft; and the controller is used for controlling the mechanical electromagnetic brake to brake. The strong breeze resisting minitype wind driven generator provided by the invention can not be forced to rotate by strong breeze, thus the safety of the minitype wind driven generator is ensured.

The invention discloses a hybrid fuzzy braking method for a brushless direct-current motor of an electric vehicle. The hybrid fuzzy braking method is used for performing braking control for the motor when a braking signal of the electric vehicle is valid, and includes detecting the rotational speed of the motor by the aid of Hall signals; judging whether the detected rotational speed of the motor is higher than a set rotational speed or not so as to determine a braking mode; adopting a mechanical braking mode if the rotational speed of the motor is lower than or equal to the set rotational speed; and adopting a hybrid braking mode combining a mechanical braking function with an energy feedback braking function if the rotational speed of the motor is higher than the set rotational speed, and disabling the energy feedback braking function while only keeping the mechanical braking function when the rotational speed of the motor is lower than the set rotational speed in a hybrid braking procedure. A self-tuning fuzzy PID (proportional integral differential) control algorithm is adopted to realize the energy feedback braking function of the hybrid braking mode, so that feedback current and pumping voltage keep lower than set values and are close to the set values to the greatest extent. The hybrid fuzzy braking method has the advantages that motor braking and energy feedback effects can be guaranteed in a braking procedure of the electric vehicle, and a driving circuit is safe.

The invention relates to a brake device for controlling the pressure applied to a brake cylinder in a pneumatic braking system, having a pneumatic pilot unit (1) located in a valve housing (3) for actuating a relay valve (2) for controlling the brake pressure (C), wherein a balance beam (8) disposed therebetween and transmitting actuating force acts together with means for displacing a counterbearing (10) as a function of the load state of the automobile, said brake device displacing the counterbearing (10) continuously in proportion to a brake pressure-speed characteristic curve utilizing the maximal permissible adhesion during braking from a high speed.

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The invention provides a strong wind resistant small-sized wind driven generator; and the strong wind resistant small-sized wind driven generator comprises a power generator spindle, a blade, a shell, a power generator rotor and a power generator stator, wherein the blade is fixed on the power generator spindle; the shell is used for supporting the power generator spindle by a bearing; the shell comprises a stator shell as well as a front end cover and a back end cover; the front end cover is positioned at the front end of the stator shell; the back end cover is positioned at the back end of the stator shell; the power generator stator is positioned in the shell and fixed on the power generator spindle; corresponding to the power generator rotor, the power generator stator is fixed on the internal surface of the stator shell of the shell; the strong wind resistant small-sized wind driven generator is characterized by further comprising a controller and a mechanical electromagnetic brake, which are connected with each other; the mechanical electromagnetic brake is mounted on the power generator spindle; and the controller is used for controlling the mechanical electromagnetic brake to brake. The strong wind resistant small-sized wind driven generator provided by the invention cannot be forced to operate when being blown by strong wind, so that the safety of the small-sized wind driven generator is ensured.

The invention discloses a shuttle valve with a middle position unloading function and a braking system for a hydraulic motor drive, and belongs to the technical field of hydraulic motor drive braking. The top of a valve chamber of the shuttle valve is communicated with a third oil outlet through an oil outlet channel, the bottom of the valve chamber is provided with an oil return channel, a through hole distributed in the vertical direction is formed in a valve element, the left end and the right end of the valve element are each provided with an elasticity reset device, and when a hydraulic system stops supplying oil, the valve element is forced by the elasticity reset devices to reset, so that the oil outlet channel, the through hole and the oil return channel are communicated to form an unloading channel of the shuttle valve. The braking system for the hydraulic motor drive comprises a brake acting on a hydraulic motor and the shuttle valve; the third oil outlet of the shuttle valve is connected with a hydraulic interface of the brake through a pipeline, and any one of shuttle valves is adopted as the shuttle valve. Accordingly, the shuttle valve can relieve pressure as required, therefore, normal braking of the brake can be guaranteed, and then the hydraulic motor gear drive works normally.

The invention discloses a safety braking device for a gear and rack type lifting device. A movable rack can move horizontally on a rail assembly or keep at certain determined positions. The top of the movable rack makes direct contact with a main bearing structure of a lifting device lift car after entering a braking state for bearing or makes contact with the main bearing structure through a middle transition bearing part for bearing. An operation mechanism for the movable rack operates the movable rack to horizontally move on a rail hole or stay and keep at certain determined positions, wherein the determined positions include a braking position engaged with a drive rack of the lifting device or a free position completely disengaged from the drive rack of the lifting device and having a certain gap with the drive rack. A rack engagement manner is adopted for conducting safety protection braking, and the beneficial effect of obviously improving the safety protection braking quality is achieved.

The invention provides a vehicle emergency braking device, belongs to the technical field of automotive safety protection and achieves the effect that a vehicle is stopped at a short distance by using additional braking force. The vehicle emergency braking device is technically characterized by comprising a braking buffer part, a braking control unit and a braking part. The braking buffer part comprises a braking shaft, a pulley, a slotted steel tube, a sliding block and a wire rope. The braking shaft is horizontally fixed to a crossbeam of the vehicle and located at the position of the center of gravity of the vehicle, the pulley is installed at the middle of the braking shaft, the slotted steel tube is arranged at the crossbeam of a vehicle chassis, the sliding block is installed in one end of the slotted steel tube in a sleeving manner, the other end of the slotted steel tube is provided with a round hole and is close to the pulley, one end of the wire rope is connected to the sliding block, the wire rope is arranged along the slotted steel tube, and the other end of the wire rope penetrates out of the round hole, is wound on the pulley and is then connected to the braking part. The vehicle emergency braking device is particularly suitable for emergency braking of the vehicle and the vehicle can be stopped at a short distance.

The invention provides a strong wind resistant small-sized wind driven generator; and the strong wind resistant small-sized wind driven generator comprises a power generator spindle, a blade, a shell, a power generator rotor and a power generator stator, wherein the blade is fixed on the power generator spindle; the shell is used for supporting the power generator spindle by a bearing; the shell comprises a stator shell as well as a front end cover and a back end cover; the front end cover is positioned at the front end of the stator shell; the back end cover is positioned at the back end of the stator shell; the power generator stator is positioned in the shell and fixed on the power generator spindle; corresponding to the power generator rotor, the power generator stator is fixed on the internal surface of the stator shell of the shell; the strong wind resistant small-sized wind driven generator is characterized by further comprising a controller and a mechanical electromagnetic brake, which are connected with each other; the mechanical electromagnetic brake is mounted on the power generator spindle; and the controller is used for controlling the mechanical electromagnetic brake to brake. The strong wind resistant small-sized wind driven generator provided by the invention cannot be forced to operate when being blown by strong wind, so that the safety of the small-sized wind driven generator is ensured.

The invention relates to a household cooking appliance which includes a receptacle (2) closed by a removable lid (3) provided with a lock tab (34) that is inserted in a slot (12) arranged in a case. The lock tab (34) is used to act on a safety part (7). The safety part (7) moves between an idle position and an activating position. The safety part (7) is returned to the idle position via a return mechanism (72). When the lock tab (34) of the lid (3) returns to an operating position, the safety part (7) moves to an activated position. On an operating position, a bolt (74B) which is connected with the safety part (7) into one body can guarantee the fixation of the lock tab (34). The case (13) includes an automatic blocking unit (50) which can lock the safety part (7) in an activated position, and an unlocking button (5) which deactivates the automatic blocking unit (50), for allowing the reverse of the part in a rest position. A return unit (72) is dimensioned such that effort exerted by the safety part (7) on the tab (34) causes automatic ejection of the tab (34) outside the slot (12) when the button (5) is actuated.

The invention discloses an electronic brake booster. The electronic brake booster comprises a motor and a boosting transmission device, wherein the boosting transmission device is driven by the motor and is provided with a rotary / translation conversion transmission mechanism; and the conversion transmission mechanism is used for converting motor rotating drive motion into output motion of translation for operating a brake system. The electronic brake booster is characterized in that the conversion transmission mechanism comprises a thread screw rod and a tooth-formed transmission belt; the thread screw rod comprises a nut and a screw rod; and the motor is in transmission connection with the nut through the tooth-formed transmission belt. By adopting the combination of the thread screw rod and the tooth-formed transmission belt, the motor rotating drive motion is converted into output motion of translation for operating the brake system, so that the cost is effectively reduced, and the transmission torque is increased; and the thread screw rod has a self-locking function, and the thread screw can be fixed to keep on braking in the process of keeping brake force even the motor is interrupted.

The invention relates to a main brake valve with electronic control and pneumatic control, which is characterized in that dual-circuit electronic control and dual-circuit pneumatic control are generated respectively by electrical signals and pneumatic signals which are obtained through detecting a brake intent, thereby controlling the rise and drop of brake pressure of a brake system, wherein twocontrol circuits independently exist in the main brake valve, when one of the control circuits malfunctions, the other control circuit keeps running; and when one circuit in the dual-circuit control malfunctions, the other circuit still takes effect. By using the main brake valve provided by the invention, braking operations implemented by drivers become safer and more reliable.

The invention relates to a horizontal safety braking device for gear and rack driven lifting equipment. The horizontal safety braking device comprises a load-bearing part, a track component, movable racks, a limiting mechanism of the movable racks, a control mechanism of the movable racks, a control device of the control mechanism of the movable racks and a manual unlocking mechanism which are configured in the horizontal direction, wherein after the horizontal safety braking device enters the braking state, the tops of the movable racks are in direct contact with the main load-bearing structure of the lifting equipment cage, or in contact with the main load-bearing structure of the lifting equipment cage through a middle transition load-bearing part for load bearing; the control mechanism of the movable racks configured in the horizontal direction controls the movable racks to perform horizontal movement on the track component or remain at certain determined positions; the determined positions comprises the braking position where the movable racks are meshed with driving racks of the lifting equipment or a free position where the movable racks and the driving racks of the lifting equipment are totally separated and spaced by an interval, and the benefits of economizing the effective space, obviously improving the leveling accuracy and the safety protection braking quality are achieved.

The invention discloses a parking brake control unit with integrated remote relieving function. The parking brake control unit comprises a first cock, a second cock, a third cock and a pulse solenoid valve, wherein the first cock is arranged on a pipeline and used for communicating with an air main; the second cock is used for communicating with a brake pipe; the third cock is used for communicating with an average pipe; the pulse solenoid valve is arranged on the pipeline and used for communicating with a parking brake cylinder; the first cock and the second cock communicate with the pulse solenoid valve; the pulse solenoid valve comprises a release piston end; the second cock also communicates with a piston end of the pulse solenoid valve; a third check valve is arranged between the second cock and the piston end; and the direction of the third check valve points to the piston end from the second cock.

The invention discloses a rail transit vehicle and a brake cylinder pressure control system and method thereof. The brake cylinder pressure control system comprises a BCU, and the BCU is connected with a train pipe control BP module and a brake cylinder pre-control EP module; the system is characterized in that the BCU and the brake cylinder pre-control EP module are electrically connected with aswitching electromagnetic valve; and the switching electromagnetic valve communicates with an air distribution valve and an action valve mounted on an action pipe communicating with a brake cylinder.According to the system, the problem that when the brake cylinder pre-control EP module breaks down, the action pipe has no pressure or the pressure cannot be relieved, so that a locomotive has no brake cylinder pressure or the brake cylinder pressure cannot be relieved is solved, and safe operation of the locomotive is ensured.

The invention provides a power-operated trolley, which comprises a frame, a steering axle, a storage battery box, an electronic control device, a driving motor, a steering device, a speed reduction box, a driving axle, a wheel assembly, an emergency braking device and a parking braking automatic control system, wherein the driving motor is provided with an electromagnetic brake, the driving axle is provided with a hydraulic brake, the emergency braking device comprises a fixing cross beam, a movable cross beam, emergency switches, springs and rotating handles, the number of the emergency switches, the springs and the rotating handles are respectively two, the two ends of the two rotating handles are respectively hinged to rotating handle hinges on the fixed cross beam and rotating handle hinges on the movable cross beam, and the connecting lines of four hinging points form a parallelogram. When the power-operated trolley is used for performing transporting operation with large carrying load, the energy consumption is low, the cost is low, driving braking and parking braking are effectively ensured through combined braking of hydraulic braking and electromagnetic braking, the safety performance is high, the specific parallelogram mechanism of the emergency braking device effectively ensures braking in emergency situations, and the safety of carried goods is effectively ensured.

The invention relates to a vacuum degree control method and system suitable for hybrid power braking. The vacuum degree control system suitable for hybrid power braking includes an engine control unit, a storage battery, a braking vacuum degree sensor, an atmospheric pressure sensor, an engine, an electric vacuum pump, a whole vehicle control unit, an electric vacuum pump relay and a vacuum booster; the method comprises the four steps that the engine control unit controls the electric vacuum pump to work according to a current braking vacuum degree; the electric vacuum pump is protected duringworking; the whole vehicle control unit runs according to logic; variables are set through the engine control unit. Compared with the prior art, the vacuum degree control method and system suitable for hybrid power braking have the advantages that the electric vacuum pump does not need to work consistently, the safety can be ensured, the energy consumption is reduced, the service life is prolonged, and the normal work of the electric vacuum pump of a whole vehicle in a life cycle is ensured; with complete and effective vacuum system fault judgment logic, it is ensured that any failure possibility of the vacuum system can be detected.

The invention discloses a vehicle capable of automatically controlling running. The vehicle comprises a frame, an automatic steering device, a driving and braking device and an automatic navigation obstacle avoidance device. The automatic steering device, the driving and braking device and the automatic navigation obstacle avoidance device are connected and controlled by a vehicle body controller,the road direction recognition and the action recognition of the vehicle are realized by a RFID card reader and a magnetic navigator which are arranged on the vehicle, a laser obstacle avoidance sensor detects an obstacle in front of the vehicle, the ground clearance of an automatic lifting device is monitored and fed back in real time, the outdoor driving can be effectively ensured, and the ground clearance of a magnetic navigation sensor and the RFID card reader can be effectively guaranteed to be 20-40 mm in the outdoor vehicle driving process; and the magnetic navigation sensor and the RFID card reader module can be retracted into the vehicle body through an automatic lifting protection device, a motor is guaranteed to automatically run and brake by driving a motor controller and an electric push rod, and a steering power supply mechanism achieves steering of the vehicle in an automatic driving state.

The application discloses a parking brake control unit with a remote release function. The parking brake control unit comprises a first cock arranged on a pipeline and used for being communicated with a main air duct, a second cock used for being communicated with a brake pipe, and a third cock used for being communicated with an average pipe, and further comprises a pulse solenoid valve arranged on the pipeline and used for being communicated with a parking brake cylinder, wherein the first cock and the second cock are communicated with the pulse solenoid valve; the pulse solenoid valve comprises a pilot control terminal used for controlling the status of the pulse solenoid valve according to pressure input; the second cock is further communicated with the pilot control terminal of the pulse solenoid valve.