Parking braking system for unpowered transfer trolley

Abstract

The invention relates to the technical field of unpowered transfer vehicles, in particular to a parking braking system for an unpowered transfer vehicle. Comprising a brake disc, a brake, a pressure supply oil cylinder and a reciprocating arc motion mechanism. The brake disc is fixedly connected to a wheel rim of the transfer trolley and rotates along with a wheel. The brake comprises brake pads, a brake spring, an oil injection cavity and a piston, the brake pads are located on the two sides of the brake disc, and the pressure supply oil cylinder is connected with the oil injection cavity through a pipeline. One end of the reciprocating arc motion mechanism is connected with the pressure supply oil cylinder, and the other end is connected with a vehicle body of the transfer vehicle; the brake spring pushes the piston, the piston pushes the brake pad to clamp the brake disc, and wheel braking is achieved. The vehicle body of the transfer vehicle drives the reciprocating arc motion mechanism to compress the pressure supply oil cylinder, hydraulic oil is injected into the oil injection cavity, the piston is pushed to compress the brake spring, the brake pad loosens the brake disc, and braking of the wheels is relieved. And very strong braking force can be provided for the transfer trolley so as to ensure that the transfer trolley cannot move at will.

Description

Technical Field

[0001] The present invention relates to the technical field of unpowered transfer vehicles, and particularly to a parking brake system for an unpowered transfer vehicle. Background Art

[0002] The typical characteristic of a crawler vehicle is that its moving part uses a crawler running device. By means of two parallel rotating closed crawlers, the vehicle can move. Compared with wheeled vehicles, crawler vehicles have greater traction ability and stronger cross-country passability, and can pass through complex road surfaces with lower bearing capacity and larger undulations. Therefore, they are widely used in the fields of agriculture and construction engineering, etc.

[0003] Crawler vehicles, especially crawler excavators, often encounter situations where they need to move short distances during operation, from one construction site to another.

[0004] Currently, the transportation operation of crawler excavators usually uses flatbed trailers for transportation or relies on their own crawlers to move. Moving with their own crawlers is extremely likely to damage the road surface. Usually, when an excavator moves in a factory area, rubber plates need to be laid to prevent damage to the paved road surface. The moving speed of the excavator is 3 - 5 km / h, which is very slow, and laying rubber plates is more time-consuming, labor-intensive, and material-consuming.

[0005] Chinese Patent with the application number 202220264736.X discloses "A transportation roller skate for crawler excavators", which is an unpowered transfer vehicle, improving the transportation speed of crawler excavators, reducing transportation costs, and at the same time eliminating damage to the road surface.

[0006] However, when the unpowered transfer vehicle is operating, the excavator needs to first use the excavating device to align the two transfer vehicles with the two crawlers on both sides respectively and then drive its own crawlers onto the transfer vehicle, and the transfer vehicle may slide before the crawlers are in place.

[0007] Currently, the unloaded transfer vehicle relies solely on its own weight to restrict its movement. When the transfer vehicle is parked on a slope, it is likely to slip, and the transfer vehicle may move back and forth when the excavator gets on it, which is not convenient for getting on. Moreover, transfer vehicles with a weight of more than 100 tons have a very large self-weight and cannot be controlled by manpower. Therefore, it is necessary to repeatedly adjust the position of the transfer vehicle to align the crawlers, greatly reducing the working efficiency of the transfer vehicle and having certain potential safety hazards. And ordinary braking systems cannot provide the braking force required for transfer vehicles with a weight of more than 100 tons. Summary of the Invention

[0008] To overcome the deficiencies of the above-mentioned prior art, the present invention provides a parking brake system for an unpowered transfer vehicle, which can provide a very powerful braking force to ensure that the transfer vehicle will not move randomly, is particularly suitable for transfer vehicles with a weight of more than 100 tons, and the magnitude of the braking force can be multiplied according to the number of brakes, with a very high upper limit.

[0009] To achieve the above object, the present invention is implemented by the following technical solutions:

[0010] A parking brake system for a non-powered transfer vehicle, comprising a brake disc, a brake, a pressure supply oil cylinder and a reciprocating arc motion mechanism; the brake disc is fixedly connected to the wheel rim of the transfer vehicle and rotates together with the wheel; the brake includes brake pads, a brake spring, an oil injection cavity and a piston, the brake pads are located on both sides of the brake disc, and the pressure supply oil cylinder is connected to the oil injection cavity through a pipeline; one end of the reciprocating arc motion mechanism is connected to the pressure supply oil cylinder, and the other end is connected to the vehicle body of the transfer vehicle; the brake spring pushes the piston, and the piston pushes the brake pads to clamp the brake disc to achieve wheel braking; the vehicle body of the transfer vehicle drives the reciprocating arc motion mechanism to compress the pressure supply oil cylinder, inject hydraulic oil into the oil injection cavity, and push the piston to compress the brake spring to release the brake pads from the brake disc, so that the wheel is released from braking.

[0011] Further, the brake further includes an adjusting nut, and the adjusting nut is threadedly connected to the piston for adjusting the braking force of the brake.

[0012] Further, the pressure supply oil cylinder is a single-acting oil cylinder, which has only one oil port, and the working oil can only enter the rodless cavity.

[0013] Further, the reciprocating arc motion mechanism is a cam swing rod mechanism.

[0014] Further, the cam swing rod mechanism includes a swing rod, a cam, a transmission shaft and a pedal; the swing rod is hinged on the vehicle body of the transfer vehicle, one end is hinged to the piston rod of the pressure supply oil cylinder, and the other end is in contact with the cam; the cam is installed on the transmission shaft, the transmission shaft is hinged on the vehicle body of the transfer vehicle, one end of the pedal is fixedly connected to the vehicle body of the transfer vehicle, and the other end is sleeved on the transmission shaft; the vehicle body drives the transmission shaft to rotate through the pedal, and then drives the cam to rotate, the cam rotation drives the swing rod, and the swing rod pushes the piston rod of the pressure supply oil cylinder.

[0015] Further, the pedal and the transmission shaft are connected by an expansion sleeve.

[0016] Further, the cam and the transmission shaft are connected by two keys, and the two keys are arranged at positions 180° apart on the circumference of the transmission shaft and are axially fixed by a spacer sleeve.

[0017] Further, it further includes an accumulator, and the accumulator is connected to the pressure supply oil cylinder through a pipeline.

[0018] Further, it further includes a hydraulic valve block, and the hydraulic valve block is connected to the accumulator and the pressure supply oil cylinder through pipelines.

[0019] Further, the hydraulic valve block is provided with an accumulator interface, an accumulator pressure measurement interface, an oil circuit pressure measurement interface, a pressure relief valve, a first quick plug interface, a manual valve, a system interface and a second quick plug interface.

[0020] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0021] 1. The present invention is provided with a brake disc and a brake. The brake includes brake pads, a brake spring, an oil injection chamber and a piston. The brake spring pushes the piston, and the piston pushes the brake pads to clamp the brake disc to achieve wheel braking. It can provide very strong braking force for the transporter to ensure that the transporter will not move randomly, which is convenient for the crawler excavator to get on and off the transporter, improves the safety performance of the transporter, and improves the working efficiency of the transporter. The disc brake is adopted, with large braking force. The braking ability is improved by expanding the number of brakes. Even when the weight class of the transporter exceeds 100 tons, sufficient braking force can be provided. It is especially suitable for transporters with a weight of more than 100 tons, and the magnitude of the braking force can be multiplied according to the number of brakes, with an extremely high upper limit. When the transporter is not working or when the vehicle to be transported gets on and off the transporter, the present invention provides braking force to ensure that the transporter does not move randomly; after the vehicle to be transported gets on the transporter, the present invention can automatically release the braking force.

[0022] 2. The brake of the present invention is provided with an adjusting nut, and the braking force of the brake can be adjusted through the adjusting nut.

[0023] 3. The present invention is provided with an accumulator, which is an energy storage device in the hydraulic system. When the pressure in the system exceeds the set pressure, the hydraulic oil will be released into the accumulator to prevent damage to the system due to excessive pressure. When the pressure is lower than the set pressure, the hydraulic oil flows back into the system from the accumulator.

[0024] 4. The present invention is provided with a hydraulic valve block. Its accumulator interface is connected to the accumulator. Its oil circuit pressure measuring interface is used to measure the initial pressure of the system and the pressure during system operation; its pressure relief valve is used to limit the maximum pressure of the system and exhaust the system; its first quick plug interface and second quick plug interface are used for oil injection or connecting other accessories; its manual valve is used to control whether the system is connected to the accumulator; its system interface is used to connect to the entire system. By precisely controlling the flow direction, flow rate and pressure of the oil, the hydraulic system can more accurately control various hydraulic actuators, thereby realizing complex control and automated operation. This precise control not only improves the safety of the system, but also enhances the reliability and performance of the system.

[0025] 5. The pedal of the present invention is connected to the transmission shaft through an expansion sleeve, which is convenient for adjusting the initial angle of the pedal. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a three-dimensional structure schematic diagram of the present invention and the transporter.

[0027] Figure 2 It is a schematic side view of the structure of the present invention and the transporter.

[0028] Figure 3 This is a schematic structural diagram of the brake of the present invention.

[0029] Figure 4 This is a three-dimensional structural schematic diagram of the cam swing rod mechanism of the present invention.

[0030] Figure 5 This is a schematic structural diagram of the hydraulic valve block of the present invention.

[0031] Figure 6 This is a schematic diagram of the braking torque of the brake of the present invention.

[0032] In the figure: 1. Brake disc; 2. Brake; 3. Pressure supply oil cylinder; 4. Accumulator; 5. Hydraulic valve block; 6. Hydraulic pipeline; 7. Swing rod; 8. Cam; 9. Transmission shaft; 10. Pedal; 11. Adjusting nut; 12. Brake spring; 13. Piston; 14. Oil injection cavity; 15. Brake pad; 16. Spacer sleeve; 17. Graphite bronze sleeve; 18. Bearing seat; 19. Expansion sleeve; 20. Accumulator interface; 21. Accumulator pressure measurement interface; 22. Oil circuit pressure measurement interface; 23. Pressure relief valve; 24. First quick plug interface; 25. Manual valve; 26. System interface; 27. Second quick plug interface. Detailed implementation manners

[0033] The embodiments of the present invention will be described in detail below. To make the objectives, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments. The description of at least one exemplary embodiment below is actually only illustrative and in no way limits the present invention and its application or use. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0034] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "axial", "radial", "circumferential", etc. indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present invention.

[0035] In the description of the present invention, it should be noted that, unless otherwise clearly specified and defined, the terms "installed", "connected", and "coupled" should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or an integral connection; it may be directly connected, or indirectly connected through an intermediate medium, and it may be the communication inside two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations.

[0036] In the description of the present invention, it should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present invention. As used herein, unless the context clearly indicates otherwise, the singular forms are also intended to include the plural forms. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, they specify the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0037] Unless otherwise specifically stated, the relative arrangements of the components and steps, numerical expressions, and values set forth in these embodiments do not limit the scope of the present invention. At the same time, it should be clear that, for the convenience of description, the dimensions of the various parts shown in the drawings are not drawn according to the actual proportional relationship. Technologies, methods, and devices known to those of ordinary skill in the relevant art may not be discussed in detail, but where appropriate, the said technologies, methods, and devices should be regarded as part of the authorized specification. In all the examples shown and discussed here, any specific values should be construed as merely exemplary and not as a limitation. Therefore, other examples of the exemplary embodiments may have different values. It should be noted that: like reference numerals and letters denote like items in the following drawings, and thus, once an item is defined in one drawing, it does not need to be further discussed in subsequent drawings.

[0038] In addition, it should be noted that the use of terms such as "first" and "second" to limit components is only for the convenience of distinguishing the corresponding components. Without further statement, the above terms have no special meaning and thus cannot be construed as limiting the protection scope of the present invention.

[0039] As Figures 1-5 shown, a parking brake system for a non-powered transporter. In this embodiment, it is used for a 200-ton transporter, which is used to transport an excavator. Wheels are provided on both sides of the transporter body. For the convenience of showing the structure of the present invention, in Figure 1The transfer vehicle only shows the wheels on one side. The present invention includes a brake disc 1, a brake 2, a pressure supply oil cylinder 3, an accumulator 4, a hydraulic valve block 5 and a reciprocating arc motion mechanism. The reciprocating arc motion mechanism adopts a cam swing rod mechanism, and the cam swing rod mechanism includes a swing rod 7, a cam 8, a transmission shaft 9, a pedal 10, a spacer sleeve 16, a graphite copper sleeve 17, a bearing seat 18 and a expansion sleeve 19.

[0040] On each side of a single transfer vehicle, there are two brakes 2 and one brake disc 1, and a total of four brakes 2 are connected in parallel to the hydraulic pipeline 6 together.

[0041] The brake disc 1 is a metal brake disc. The brake disc 1 is connected to the wheel rim of the transfer vehicle through a steel pipe diameter change by means of bolt connection and rotates together with the wheel. At the same time, the brake disc 1 is located between the brake pads 15 on both sides of the brake 2, and there is a gap of 0.25 mm to 0.75 mm between the brake disc 1 and the brake pads 15 on both sides in the released brake state. When braking, the brake pads 15 clamp the brake disc 1 to prevent the wheel from rotating.

[0042] As Figure 3 shown, the brake 2 is a hydraulic parking brake, including brake pads 15, a brake spring 12, a piston 13 and an adjusting nut 11. The housing of the brake 2 is fixedly connected to the side of the transfer vehicle body by bolts. An oil injection cavity 14 and a spring cavity are provided inside the housing of the brake 2.

[0043] The piston 13 is installed inside the housing and is a two-way piston. One side of the piston 13 is the oil injection cavity 14, and the other side is the spring cavity. The central cylinder rod on the oil injection cavity side extends all the way to the outside of the housing and contacts the brake pads 15. In the braking state, the brake spring 12 pushes the piston 13 to press the cylinder rod against the brake pads 15 to clamp the brake disc 1 to complete braking. When hydraulic oil is filled into the oil injection cavity 14, the piston 13 drives the cylinder rod to compress and move towards the brake spring 12 side, and the brake pads 15 leave the brake disc 1 to release the brake state. The braking force of the brake can be adjusted through the adjusting nut 11. The braking torque of the brake can be adjusted within 2000 N·m to 7000 N·m according to the diameter of the brake disc, and the braking force can be increased exponentially by increasing the number of brakes.

[0044] The pressure supply oil cylinder 3 is a single-acting oil cylinder, which only has one oil port. The working oil can only enter the rodless cavity, and the oil port is connected to the hydraulic pipeline 6.

[0045] As Figure 1 、 4As shown in the figure, the cam swing rod mechanism includes a swing rod 7, a cam 8, a transmission shaft 9, a pedal 10, a spacer sleeve 16, a graphite bronze sleeve 17, a bearing seat 18 and a expansion sleeve 19. The pedal 10 is an arc-shaped plate, the top end of which is fixedly connected to the bottom surface of the vehicle body of the transporter. The expansion sleeve 19 is fixedly connected to the bottom end of the pedal 10. The pedal 10 and the transmission shaft 9 are connected by the expansion sleeve 19 to facilitate the adjustment of the initial angle of the pedal 10. To ensure strength and reduce the rotational resistance of the transmission shaft 9, the transmission shaft 9 is connected to the bearing seat 18 by the graphite bronze sleeve 17. The bearing seat 18 is fixedly connected to the vehicle body of the transporter by bolts. The cam 8 and the transmission shaft 9 are connected by a 180-degree double key and axially positioned by the spacer sleeve 16. The end of the cylinder rod of the pressure supply oil cylinder 3 is connected to the top end of the swing rod 7 by a pin shaft. The swing rod 7 is hinged on the vehicle body of the transporter, and the bottom surface of the swing rod 7 is in contact with the cam 8. The pedal 10 drives the transmission shaft 9 to rotate, and then drives the cam 8 to rotate. The cam 8 drives the swing rod 7 to swing, and then drives the cylinder rod of the pressure supply oil cylinder 3 to lift and lower.

[0046] The present invention is provided with an accumulator 4, and the accumulator 4 is connected to the pressure supply oil cylinder 3 through a pipeline. The accumulator 4 is an energy storage device in the hydraulic system. When the pressure in the system exceeds the set pressure, the hydraulic oil will be released into the accumulator to prevent the system from being damaged due to excessive pressure. When the pressure is lower than the set pressure, the hydraulic oil flows back from the accumulator into the system.

[0047] As Figure 5 As shown in the figure, the main body of the hydraulic valve block 5 is provided with an accumulator interface 20, an accumulator pressure measuring interface 21, an oil circuit pressure measuring interface 22, a pressure relief valve 23, a first quick plug interface 24 and a second quick plug interface 25. The accumulator interface 20 is connected to the accumulator 4. The accumulator interface 20 is connected to the accumulator pressure measuring interface 21 and the left end of the manual valve 25 inside the main body of the hydraulic valve block for measuring the pressure inside the accumulator. The oil circuit pressure measuring interface 22 is connected to the system interface 26, the pressure relief valve 23, the first quick plug interface 24, the right end of the manual valve 25, the system interface 26 and the second quick plug interface 27 inside the main body of the hydraulic valve block 5. Among them, the oil circuit pressure measuring interface 22 is used to measure the initial pressure of the system and the pressure during the operation of the system. The pressure relief valve 23 is used to limit the maximum pressure of the system and exhaust the system. The first quick plug interface 24 and the second quick plug interface 27 are used for oil injection or connecting other accessories. The manual valve 25 is used to control whether the system is connected to the accumulator 4, and the system interface 26 is used to connect to the entire hydraulic system. By precisely controlling the flow direction, flow rate and pressure of the oil fluid, the hydraulic system can more accurately control various hydraulic actuators, thereby realizing complex control and automated operation. This precise control not only improves the safety of the system, but also enhances the reliability and performance of the system.

[0048] As Figure 6As shown in the figure, on the brake disc 1 with a diameter of 460 mm of the 200-ton transfer vehicle, a single brake 2 can generate a braking torque of approximately 4700 N·m. The self-weight of the 200-ton transfer vehicle is about 17000 kg. When it stops on a 5-degree slope, the downward sliding force generated by its own gravity is about 14000 N. The tire diameter is 1.67 m. Approximately 11690 N·m of braking torque is required to ensure that the transfer vehicle does not move. A single transfer vehicle is equipped with 4 brakes 2, which can provide a total braking torque of 18800 N·m, sufficient to control the transfer vehicle from slipping. If the front side of the vehicle body contacts the ground when the transfer vehicle is placed, certain frictional force will also be generated, and it can stop on a steeper slope. If you want to further increase the braking force, you can also increase the number of brakes 2. Similarly, when the excavator gets on the transfer vehicle, the braking system of the present invention can provide a total braking force of 45000 N in the state of 8 brakes 2 on two transfer vehicles, ensuring the stability of the transfer vehicle during the process of the excavator getting on the transfer vehicle.

[0049] As Figure 1 , Figure 2 shown, the working principle and working process of the present invention are as follows:

[0050] When the transfer vehicle is not working, under the elastic force of the brake spring 12 of the present invention, the piston 13 presses the hydraulic oil in the oil injection cavity 14 back into the pressure supply oil cylinder 3. At the same time, the piston 13 pushes the brake pads 15 to clamp the brake disc 1 to lock the wheels, and the present invention brakes the transfer vehicle.

[0051] When the excavator gets on the transfer vehicle, the excavator track presses on the upper surface of the vehicle body of the transfer vehicle, and the vehicle body rotates clockwise. The pedal 10 drives the transmission shaft 9 and the cam 8 to rotate clockwise. The cam 8 drives the swing rod 7 to push the cylinder rod of the pressure supply oil cylinder 3 upward. The pressure supply oil cylinder 3 is compressed, and the hydraulic oil inside the pressure supply oil cylinder 3 is pressed into the hydraulic pipeline 6 and finally enters the oil injection cavity 14 of the brake 2. The hydraulic oil pushes the piston 13 to compress the brake spring 12, so that the brake pads 15 loosen the brake disc 1 and the wheels can rotate. When the excavator completely gets on the transfer vehicle, the transfer vehicle can be towed by the tractor for the transportation of the excavator.

[0052] When the excavator gets off the transfer vehicle, when the track leaves the pedal 10, the brake spring 12 pushes the piston 13 to press the hydraulic oil in the oil injection cavity 14 back into the pressure supply oil cylinder 3. At the same time, the piston 13 will push the brake pads 15 to clamp the brake disc 1 to lock the wheels. The hydraulic oil enters the pressure supply oil cylinder 3 to make the cylinder rod of the pressure supply oil cylinder 3 extend to push the 7 swing rods, and the swing rod 7 pushes the cam 8 to drive the transmission shaft 9 and the pedal 10 back to the initial position.

[0053] In the released braking state, the pressure within the entire hydraulic system will reach 14 to 18 MPa and remain at this pressure throughout the transfer process. At this time, a part of the hydraulic oil should enter the accumulator 4. In this way, when the system oil is lacking or the pressure in the system is insufficient, the oil in the accumulator 4 will supplement the system oil, preventing the transfer vehicle from experiencing an emergency brake due to a sudden loss of system pressure during the transfer process, which could pose a danger.

[0054] The present invention can provide a very powerful braking force for the transfer vehicle to ensure that the transfer vehicle does not move randomly, facilitating the upper and lower movement of the crawler excavator on and off the transfer vehicle, improving the safety performance of the transfer vehicle, and enhancing the working efficiency of the transfer vehicle. By using disc brakes, a large braking force is generated. The braking capacity is improved by increasing the number of brakes. Even when the weight class of the transfer vehicle exceeds 100 tons, sufficient braking force can be provided. It is especially suitable for transfer vehicles with a weight of over 100 tons, and the magnitude of the braking force can be multiplied according to the number of brakes, with a very high upper limit.

[0055] As described above, only some specific embodiments of the present invention are provided. The protection scope of the present invention is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present invention, based on the technical solution and inventive concept of the present invention, through equivalent replacement or modification, should be covered within the protection scope of the present invention.

Claims

1. A parking brake system for an unpowered transport vehicle, characterized in that: It includes a brake disc, a brake, a pressure supply cylinder and a reciprocating arc motion mechanism; The brake disc is fixedly connected to the wheel rim of the transfer vehicle and rotates with the wheel; The brake comprises a brake pad, a brake spring, an oil injection chamber and a piston, the brake pad is located on both sides of the brake disc, and the pressure supply cylinder is connected to the oil injection chamber pipeline; One end of the reciprocating arc motion mechanism is connected to the pressure supply cylinder, and the other end is connected to the body of the transfer vehicle; The brake spring pushes the piston, and the piston pushes the brake pad to clamp the brake disc to achieve wheel braking; The body of the transfer vehicle drives the reciprocating arc motion mechanism to compress the pressure supply cylinder, and the hydraulic oil is injected into the oil filling chamber, pushing the piston to compress the brake spring so that the brake pad releases the brake disc, so that the wheel is released from the brake.

2. A parking brake system for an unpowered transport vehicle according to claim 1, characterized in that: The brake also includes an adjusting nut, which is threadedly connected to the piston and is used to adjust the braking force of the brake.

3. A parking brake system for an unpowered transport vehicle according to claim 1, characterized in that: The pressure supply cylinder is a single-acting cylinder having only one oil port, and the working oil can only enter the rodless cavity.

4. A parking brake system for an unpowered transport vehicle according to claim 1, characterized in that: The reciprocating arc motion mechanism is a cam rocker mechanism.

5. A parking brake system for an unpowered transport vehicle according to claim 4, characterized in that: The cam rocker mechanism comprises a rocker, a cam, a transmission shaft and a pedal; The swing arm is hinged on the body of the transfer vehicle, one end of which is hinged to the piston rod of the pressure supply cylinder, and the other end of which is in contact with the cam; The cam is installed on the transmission shaft, the transmission shaft is hinged on the body of the transfer vehicle, one end of the pedal is fixed to the body of the transfer vehicle, and the other end is sleeved on the transmission shaft; The vehicle body drives the transmission shaft to rotate through the pedal, which in turn drives the cam to rotate. The rotation of the cam drives the rocker rod, and the rocker rod pushes the piston rod of the pressure supply cylinder.

6. A parking brake system for an unpowered transport vehicle according to claim 5, characterized in that: The pedal is connected to the transmission shaft via an expansion sleeve.

7. A parking brake system for an unpowered transport vehicle according to claim 5, characterized in that: The cam is connected to the transmission shaft by two keys, which are arranged 180 degrees apart on the circumference of the transmission shaft and are axially fixed by a spacer.

8. A parking brake system for an unpowered transport vehicle according to claim 1, characterized in that: It also includes an accumulator, which is connected to the pressure supply cylinder pipeline.

9. A parking brake system for an unpowered transport vehicle according to claim 9, characterized in that: It also includes a hydraulic valve block, which is connected to the accumulator and a pressure supply cylinder pipeline.

10. A parking brake system for an unpowered transport vehicle according to claim, characterized in that: The hydraulic valve block is provided with an accumulator interface, an accumulator pressure measuring interface, an oil circuit pressure measuring interface, a pressure relief valve, a first quick-plug interface, a manual valve, a system interface and a second quick-plug interface.

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