Multifunctional practical training platform for air braking system of commercial vehicle

Abstract

The utility model discloses a multifunctional practical training platform for an air brake system of a commercial vehicle, which belongs to the technical field of air brake systems and comprises a rack, a clamping mechanism used for installing a front air brake tank and a rear air brake tank is arranged on one side of a frame of the rack, and the clamping mechanism is composed of symmetrically distributed fixing plates and a supporting plate located between the two fixing plates. The supporting plate vertically moves along the fixing plate; the sliding plate is arranged above the supporting plate and moves inwards and outwards in the horizontal direction; the front brake gas tank is installed at the position, located on one side of the sliding plate, above the supporting plate, and the rear brake gas tank is installed above the sliding plate. The gas tanks can be replaced and carried conveniently, after the fixing plate is moved to the lowest position, the sliding plate is pulled open to achieve separation of the two gas tanks, the space where personnel are located is increased when the gas tanks are disassembled and carried, and the gas tanks are further disassembled and replaced conveniently.

Description

Technical Field

[0001] The utility model relates to the technical field of pneumatic braking systems, and more specifically, to a multi-functional training platform for a commercial vehicle pneumatic braking system. Background Technique

[0002] As one of the important systems to ensure vehicle driving safety and increase the average speed of automobiles, the braking system can be divided into pneumatic braking and hydraulic braking according to different braking working media in the teaching process of automobile maintenance. Commercial vehicles usually adopt pneumatic braking. The operating mechanism of the pneumatic braking system has a complex structure and a relatively large number of braking pipelines, etc., making the maintenance of the pneumatic braking system a teaching difficulty in the commercial vehicle maintenance course.

[0003] The Chinese patent document with the publication number CN209895672U in the prior art provides an experimental platform for a commercial vehicle pneumatic braking system, including a console module, a frame module and a gas source module. The frame module includes a front first axle, a front second axle, a middle axle, a rear axle, a horn, a quick release valve, a relay valve 1, an air compressor, an exhaust brake valve, an exhaust brake solenoid valve, a front brake chamber pressure sensor, a pipe group, a crossbeam pipe joint, a differential valve, a relay valve 2 and a rear brake chamber pressure sensor. The crossbeam pipe joint and the gas source module are connected by an air pipe. The console module is of an L-shaped structure and is sequentially provided with a control panel 1, a control panel 2, a control panel 3, a vehicle logo, an 18-bit terminal block, a 6-bit air pipe joint, a power indicator light and a wire reel from top to bottom. The front brake chamber pressure sensor, the rear brake chamber pressure sensor, the horn and the exhaust electromagnetic brake valve are all connected to the 18-bit terminal block through wires. The advantages of the present utility model compared with the prior art are: multi-functional and high flexibility.

[0004] Although the device has many beneficial effects, there are still the following problems: The air tanks for simulating the front and rear air brakes need to be installed on one side of the bench. After a long time of experiments or training, due to equipment wear, corrosion, staff mistakes, etc., the air tanks may be damaged, or due to experimental needs, other air tanks need to be replaced. At this time, usually, the valve joints are manually loosened, and then the air tanks are manually removed. However, in fact, the air tanks themselves are large in volume and heavy, and it is extremely inconvenient during the disassembly and handling process. Content of the Utility Model

[0005] 1. Technical Problem to be Solved

[0006] The purpose of the present utility model is to provide a multi-functional training platform for a commercial vehicle pneumatic braking system to solve the problem that the air tank itself is large in volume and heavy, and it is extremely inconvenient during the disassembly and handling process as proposed in the above background technique.

[0007] 2. Technical Solution

[0008] A multi-functional training bench for a commercial vehicle air braking system, comprising:

[0009] A bench frame, on one side of the frame of the bench frame, there is a clamping mechanism for installing front and rear air brake cylinders. The clamping mechanism consists of symmetrically distributed fixed plates and a support plate located between the two fixed plates. The support plate moves vertically along the fixed plates;

[0010] A sliding plate, arranged above the support plate and moving in and out along the horizontal direction;

[0011] A front brake air cylinder and a rear brake air cylinder. The front brake air cylinder is installed at a position above the support plate and on one side of the sliding plate, and the rear brake air cylinder is installed above the sliding plate.

[0012] Preferably, the support plate includes a transverse plate and connecting rods I located at the four corner positions of the transverse plate. The transverse plate is located below the sliding plate and linearly and equidistantly provided with a number of trapezoidal straight grooves. Guide straight rods for facilitating the linear movement of the sliding plate are installed at both sides of the trapezoidal straight grooves.

[0013] Preferably, the sliding plate includes a longitudinal plate that moves linearly along the guide straight rods. A number of trapezoidal straight strips are installed below the longitudinal plate. A number of pulleys are installed on one side of the trapezoidal straight strips. The trapezoidal straight strips and the pulleys are arranged at intervals. The trapezoidal straight strips and the pulleys are both located inside the trapezoidal straight grooves and move linearly in and out along the guide straight rods.

[0014] Preferably, the end of the connecting rod I is connected to a sliding seat. Two limiting tracks are provided on the surface of each fixed plate. Two sets of stabilizing components are installed inside each limiting track. The two sets of stabilizing components are symmetrically arranged on the upper and lower sides of the sliding seat respectively. The two sets of stabilizing components are connected in communication to form an oil circuit for the internal flow of hydraulic oil. When the sliding seat moves, it squeezes the stabilizing components, causing the hydraulic oil inside the stabilizing components to flow to the other stabilizing component to stably support the sliding seat.

[0015] Preferably, the stabilizing component includes a telescopic oil bladder, an oil storage tank, a pressing plate and a connecting pipe. The telescopic oil bladder is connected in communication with the oil storage tank and is located inside the limiting track. The end of the telescopic oil bladder is hermetically installed with the pressing plate. One end of the connecting pipe is connected in communication with the bottom of the oil storage tank. The other end of the connecting pipe passes through the limiting track and extends to the outside and is connected in communication with the stacked connecting pipes to form an oil circuit.

[0016] Preferably, a number of sets of buffer components are installed outside the limiting track. Each set of buffer components includes a connecting rod II, a first buffer spring and a second buffer spring. The connecting rod II penetrates through the sliding seat and is respectively connected to the inner top wall and the inner bottom wall of the limiting track. The first buffer spring is sleeved and installed at the position of the connecting rod II below the sliding seat. The second buffer spring is sleeved and installed at the position of the connecting rod II above the sliding seat.

[0017] Preferably, T-shaped limit blocks are provided on both side walls of the sliding seat, and T-shaped limit grooves are linearly opened at positions corresponding to the T-shaped limit blocks on the inner side walls of the limit track. The sliding seat is kept in upper and lower limits by the T-shaped limit blocks embedded in the T-shaped limit grooves.

[0018] Preferably, a trailer braking system for simulating trailer braking is installed at the tail of the bench. The trailer braking system includes a one-axle braking air chamber for simulating the first axle of the trailer, a two-axle braking air chamber for simulating the second axle of the trailer, and a three-axle braking air chamber for simulating the third axle of the trailer. A three-axle synchronous valve for supplying air for parking braking is installed between the one-axle braking air chamber and the two-axle braking air chamber, and a trailer air storage tank for supplying air to release the parking braking is installed between the two-axle braking air chamber and the three-axle braking air chamber.

[0019] Preferably, two of each of the one-axle braking air chamber, the two-axle braking air chamber, and the three-axle braking air chamber are provided, and the three are arranged in sequence along the tail of the bench. A first air supply pipe is installed and connected between the three-axle synchronous valve and the trailer air storage tank, second air supply pipes are installed and connected between the trailer air storage tank and the two-axle braking air chamber and the three-axle braking air chamber respectively, and a third air supply pipe is installed and connected between the three-axle synchronous valve and the three-axle braking air chamber. The other side of the three-axle synchronous valve is connected to a control pipe and an air inlet pipe in sequence from top to bottom.

[0020] 3. Beneficial effects

[0021] Compared with the prior art, the advantages of the present utility model are as follows:

[0022] 1. In the present utility model, the air tank is carried by designing the support plate and the sliding plate. The support plate can move up and down along the fixed plate to adjust the height of the air tank from the ground, so as to facilitate the replacement and handling of the air tank. After moving the fixed plate to the lowest position, the sliding plate is pulled open to separate the two air tanks, increasing the space for personnel when disassembling and handling the air tank, and further facilitating the disassembly and replacement of the air tank.

[0023] 2. In the present utility model, by setting the stabilizing component, when the support plate moves up and down, the sliding seat will squeeze the upper and lower stabilizing components, so that the hydraulic oil inside the squeezed stabilizing component enters another stabilizing component through the oil circuit. Thus, when the sliding seat moves up and down, the upper and lower stabilizing components and the sliding seat always keep close fit, applying force to the sliding seat, thereby increasing the stability when the support plate moves up and down;

[0024] 3. In the present utility model, by designing the buffer component, a protective measure is added between the top and bottom ends of the sliding seat and the limit track to prevent injuries to personnel caused by the sliding seat falling or rising rapidly due to accidents, improving safety;

[0025] 4. Compared with the training bench of the air braking system of the tractor in the traditional technology, the utility model adds a trailer braking part. By simulating the trailer braking part through the air circuit structure and valve parts, students can be familiar with the components and their composition of the trailer air braking system, which helps students understand the switching of the braking air chambers and connecting pipelines of the first, second, and third axles, and enables them to master proficiently the pipeline connection of different types of air braking systems. At the same time, it includes the valve parts of the air braking system of traditional vehicles, and corresponding teaching and training work of relevant projects can be carried out according to different needs. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 is the overall structural schematic diagram proposed by the utility model;

[0027] Figure 2 is the partial structural schematic diagram proposed by the utility model;

[0028] Figure 3 is the structural schematic diagram of the bench mounting fixing plate proposed by the utility model;

[0029] Figure 4 is the structural schematic diagram of the support plate and the sliding plate proposed by the utility model;

[0030] Figure 5 is the structural schematic diagram of the stabilizing assembly proposed by the utility model;

[0031] Figure 6 is the structural schematic diagram of the fixing plate and the limiting track proposed by the utility model;

[0032] Figure 7 is the structural schematic diagram of the support, stabilizing assembly and limiting track proposed by the utility model;

[0033] Figure 8 is the structural schematic diagram of the driving mode of the motor screw rod proposed by the utility model;

[0034] Figure 9 is the structural schematic diagram of the trailer braking system from the first perspective proposed by the utility model;

[0035] Figure 10 is the structural schematic diagram of the trailer braking system from the second perspective proposed by the utility model;

[0036] Description of reference numerals in the figure: 1. Bench; 2. Fixed plate; 3. Support plate; 4. Sliding plate; 5. Stabilizing component; 6. Buffer component; 7. Limiting track; 8. Sliding seat; 9. T-shaped limiting block; 10. T-shaped limiting groove; 11. First-bridge brake air chamber; 12. Second-bridge brake air chamber; 13. Third-bridge brake air chamber; 14. Third-bridge synchronization valve; 15. Trailer air storage tank; 16. First air supply pipe; 17. Second air supply pipe; 18. Third air supply pipe; 19. Control pipeline; 20. Intake pipe;

[0037] 31. Transverse plate; 32. Trapezoidal straight groove; 33. Guide straight rod; 34. Connecting rod one;

[0038] 41. Longitudinal plate; 42. Trapezoidal straight bar; 43. Pulley; 44. Handle;

[0039] 51. Telescopic oil bladder; 52. Oil storage tank; 53. Extrusion plate; 54. Connecting pipe;

[0040] 61. Connecting rod two; 62. First buffer spring; 63. Second buffer spring. Detailed implementation mode

[0041] In the description of the present utility model, it should be understood that the orientation or positional relationship indicated by terms such as "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc. is the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present utility model 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 cannot be understood as a limitation to the present utility model.

[0042] In the description of the present utility model, the meaning of "a plurality of" is two or more, unless otherwise specifically defined.

[0043] In the description of the present utility model, it should be noted that unless otherwise clearly specified and limited, terms such as "installation", "provided with", "sheathed / connected", "connection", etc. should be understood in a broad sense. For example, "connection" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific situations.

[0044] Please refer to Figure 1-8 , the present utility model provides a technical solution:

[0045] A multi-functional training bench for the air brake system of commercial vehicles mainly simulates the air brake system of a tractor + semi-trailer through its structure. In addition to including the valve parts of the air brake system of traditional vehicles, it is equipped with an EBS electronic control system, and corresponding teaching and training work can be carried out according to different needs. That is, it can be assembled according to the traditional brake system or the EBS system.

[0046] It specifically includes the following structures:

[0047] The bench 1, as shown in the structure diagram of the bench 1 (the connecting pipes are not shown in the figure). A clamping mechanism for installing the front and rear air brake cylinders is arranged on one side of the frame of the bench 1. The front air cylinder for supplying air to the front air brake and the rear air cylinder for supplying air to the rear air brake are installed on one side of the bench, which is convenient for demonstrating the overall structure and simulating the vehicle air brake system. Continuing to refer to Figure 1 it can be seen that the clamping mechanism consists of symmetrically distributed fixed plates 2 and a support plate 3 located between the two fixed plates 2. The support plate 3 moves vertically along the fixed plate 2. When simulating the use of the brake system, the support plate 3 is lifted above. When it is necessary to replace, disassemble or perform other operations on the air cylinder, the height of the support plate 3 can be reduced, so as to facilitate the personnel to take away and carry the air cylinder, etc.; Figure 2 In this embodiment, a motor is used to drive the threaded rod to rotate, thereby driving the support plate 3 to lift and lower. The driving method includes but is not limited to the method provided in this embodiment. Hydraulic cylinders, manual rotation, etc. can all be used as alternative methods, as long as the support plate 3 can be moved up and down. This is prior art, so it will not be elaborated here;

[0048] Please refer to the attached Figure 8 specification.

[0049] The sliding plate 4 is arranged above the support plate 3. The sliding plate 4 can be pulled by a handle to move outward along the horizontal direction, so as to conveniently extend the air cylinder installed above the sliding plate 4 forward by a certain distance, thereby increasing the distance between the two air cylinders and increasing the operating space for personnel to operate on the air cylinder, facilitating personnel to disassemble and carry the air cylinder; and, the front brake air cylinder and the rear brake air cylinder. The front brake air cylinder is installed at a position above the support plate 3 on one side of the sliding plate 4, and the rear brake air cylinder is installed above the sliding plate 4.

[0050] Please refer to the attached Figure 4, a specific description of the support plate 3 in this embodiment is given. The support plate 3 includes a transverse plate 31 and connecting rods 34 at the four corner positions of the transverse plate 31. The connecting rods 34 move up and down along the fixed plate 2, so as to facilitate lifting or lowering the position of the support plate 3, and further change the height of the gas tank. A number of trapezoidal straight grooves 32 are linearly and equidistantly opened at the position of the transverse plate 31 below the sliding plate 4. Guide straight rods 33 for facilitating the linear movement of the sliding plate 4 are installed on both sides of the trapezoidal straight grooves 32. Through the trapezoidal straight grooves 32 and the guide straight rods 33, the sliding plate 4 is pulled outwards from above the support plate 3.

[0051] Please refer to the attached drawings of the specification Figure 4 , a specific description of the sliding plate 4 in this embodiment is given. The sliding plate 4 includes a longitudinal plate 41 that moves linearly along the guide straight rod 33. A handle 44 is installed on the outer side of the longitudinal plate 41. A number of trapezoidal straight strips 42 are installed below the longitudinal plate 41. A number of pulleys 43 are installed on one side of the trapezoidal straight strips 42. The trapezoidal straight strips 42 and the pulleys 43 are arranged at intervals. The trapezoidal straight strips 42 and the pulleys 43 are both located inside the trapezoidal straight grooves 32 and move linearly in and out along the guide straight rod 33. The user pulls the longitudinal plate 41 through the handle 44. Since the trapezoidal straight strips 42 and the pulleys 43 are distributed at intervals inside the trapezoidal straight grooves 32, the longitudinal plate 41 can move outwards smoothly. Because the gas tank itself is heavy, the trapezoidal straight strips 42 can play the role of reinforcing ribs, and the pulleys 43 can also play a supporting role.

[0052] Please refer to the attached drawings of the specification Figure 7 , a specific description of the state when the support plate 3 in this embodiment moves up and down is given. The end of the connecting rod 34 is connected to the sliding seat 8. Two limit tracks 7 are opened on the surface of each fixed plate 2. Two sets of stable components 5 are installed inside each limit track 7. The two sets of stable components 5 are symmetrically arranged on the upper and lower sides of the sliding seat 8 respectively. The two sets of stable components 5 are connected to form an oil path for the internal hydraulic oil to flow. When the sliding seat 8 moves downwards, it squeezes the lower stable component 5, so that the hydraulic oil inside the lower stable component 5 flows to the upper stable component 5 to stably support the sliding seat 8. Therefore, no matter how much the lower stable component 5 shortens, the upper stable component 5 will elongate by the same length, so that the upper and lower sides of the stable component 5 always maintain a stressed state, making the movement of the support plate 3 more stable. At the same time, the lower stable component 5 provides an upward supporting force for the sliding seat 8, so as to ensure that the support plate 3 always plays a supporting role when moving up and down.

[0053] Please refer to the attached drawings of the specification Figure 5, the stabilizing component 5 in this embodiment will be further described. The stabilizing component 5 includes a telescopic oil bladder 51, an oil storage tank 52, a pressing plate 53, and a connecting pipe 54. The telescopic oil bladder 51 is connected to the oil storage tank 52 and is located inside the limiting track 7. The end of the telescopic oil bladder 51 is hermetically installed with the pressing plate 53. One end of the connecting pipe 54 is connected to the bottom of the oil storage tank 52, and the other end of the connecting pipe 54 passes through the limiting track 7 and extends to the outside to be connected to the stacked connecting pipe 54 to form an oil circuit. Taking the process of the support plate 3 moving downward as an example, when the support plate 3 moves downward, the sliding seat 8 at the corner of the support plate 3 presses the pressing plate 53 of the lower stabilizing component 5 below. The pressing plate 53 moves downward to press the hydraulic oil inside the telescopic oil bladder 51. The hydraulic oil inside the telescopic oil bladder 51 flows through the oil storage tank 52 and the connecting pipe 54 into the oil storage tank 52 above and further into the telescopic oil bladder 51 above, thereby pushing the upper pressing plate 53 to move downward. It should be noted that when the pressing plate 53 moves to contact the telescopic oil bladder 51, if the support plate 3 is still moving downward, the pressing plate 53 will press the telescopic oil bladder 51, and the telescopic oil bladder 51 itself can also expand and contract. Therefore, the telescopic oil bladder 51 will contract. Similarly, the upper telescopic oil bladder 51 will expand.

[0054] Please refer to the attached drawings of the specification Figure 6-7 , the buffer component 6 in this embodiment will be further described. A plurality of groups of buffer components 6 are installed on the outer side of the limiting track 7. Each group of buffer components 6 includes a second connecting rod 61, a first buffer spring 62, and a second buffer spring 63. The second connecting rod 61 passes through the sliding seat 8 and is respectively connected to the inner top wall and the inner bottom wall of the limiting track 7. The first buffer spring 62 is sleeved on the second connecting rod 61 at a position below the sliding seat 8, and the second buffer spring 63 is sleeved on the second connecting rod 61 at a position above the sliding seat 8. Taking the support plate 3 moving downward as an example again, when the sliding seat 8 moves downward, it will press the lower first buffer spring 62. The greater the distance the support plate 3 descends, the greater the extrusion force on the first buffer spring 62 and the greater the reverse force provided, which can effectively prevent the support plate 3 from falling rapidly due to accidents or operational errors, thus improving safety.

[0055] Please refer to the attached drawings of the specification Figure 7 , the moving state of the sliding seat 8 in this embodiment will be further described. T-shaped limiting blocks 9 are provided on both side walls of the sliding seat 8. T-shaped limiting grooves 10 are linearly opened at positions corresponding to the T-shaped limiting blocks 9 on both inner side walls of the limiting track 7. The sliding seat 8 realizes up-and-down limiting by the T-shaped limiting blocks 9 embedded in the T-shaped limiting grooves 10, so that the sliding seat 8 will not deviate when moving up and down.

[0056] Embodiment 2

[0057] Based on Embodiment 1, this embodiment further provides a trailer braking system installed at the tail of the test bench 1. Please refer to the attached Figure 9-10 , the trailer braking system in this embodiment is used to simulate trailer braking, that is, to simulate the three sets of wheels at the rear of the trailer, namely the first-bridge braking air chamber 11 simulating the first bridge of the trailer, the second-bridge braking air chamber 12 simulating the second bridge of the trailer, and the third-bridge braking air chamber 13 simulating the third bridge of the trailer. A three-bridge synchronous valve 14 for supplying air for parking braking is installed between the first-bridge braking air chamber 11 and the second-bridge braking air chamber 12, and a trailer air storage tank 15 for releasing parking braking air supply is installed between the second-bridge braking air chamber 12 and the third-bridge braking air chamber 13. Through the air circuit structure, the air pressure braking process and the release of the air pressure braking process of the actual trailer are simulated.

[0058] Specifically, the trailer braking system in this embodiment is described as follows. The first-bridge braking air chamber 11, the second-bridge braking air chamber 12, and the third-bridge braking air chamber 13 are all provided with two, and the three are arranged in sequence along the tail of the test bench 1 to simulate the three sets of wheels of the trailer;

[0059] A first air supply pipe 16 is installed and connected between the three-bridge synchronous valve 14 and the trailer air storage tank 15. The first air supply pipe 16 is used for the three-bridge synchronous valve 14 to supply air to the trailer air storage tank 15;

[0060] The trailer air storage tank 15 is installed and connected to both the second-bridge braking air chamber 12 and the third-bridge braking air chamber 13 through a second air supply pipe 17. The second air supply pipe 17 is used for the trailer air storage tank 15 to supply air for releasing the parking brake of the second-bridge braking air chamber 12 and the third-bridge braking air chamber 13;

[0061] A third air supply pipe 18 is installed and connected between the three-bridge synchronous valve 14 and the third-bridge braking air chamber 13. The third air supply pipe 18 is used for the three-bridge synchronous valve 14 to supply air for braking the third-bridge braking air chamber 13;

[0062] On the other side of the three-bridge synchronous valve 14, a control pipeline 19 and an air inlet pipe 20 are connected in sequence. The control pipeline 19 controls the trailer simulation system, and the air inlet pipe 20 supplies air to the three-bridge synchronous valve 14.

[0063] For the air pressure braking system involved in this embodiment, conventional technical means in the art can be adopted. Its supporting hydraulic system, solenoid valve, and pipeline can also be provided by the manufacturer. In addition, the circuits, electronic components, and modules involved in the present utility model are all prior arts, which can be fully realized by those skilled in the art without further elaboration. The content protected by the present utility model does not involve improvements to the internal structure and method.

[0064] The foregoing has shown and described the basic principles, main features and advantages of the present utility model. Those skilled in the art should understand that the present utility model is not limited by the above embodiments. The above embodiments and the descriptions in the specification are only preferred examples of the present utility model and are not used to limit the present utility model. Without departing from the spirit and scope of the present utility model, the present utility model will have various changes and improvements, and these changes and improvements all fall within the scope of the present utility model claimed. The scope of protection claimed by the present utility model is defined by the appended claims and their equivalents.

Claims

1. A multifunctional training platform for commercial vehicle pneumatic brake system, characterized in that: include: A stand (1), a clamping mechanism for mounting front and rear air brake tanks is arranged on one side of the frame of the stand (1), the clamping mechanism comprising symmetrically distributed fixing plates (2) and a supporting plate (3) located between the two fixing plates (2), and the supporting plate (3) moves vertically along the fixing plates (2); A sliding plate (4) is arranged above the supporting plate (3) and moves inward and outward along a horizontal direction; A front brake air tank and a rear brake air tank, wherein the front brake air tank is installed above the support plate (3) at a position on one side of the sliding plate (4), and the rear brake air tank is installed above the sliding plate (4).

2. A multifunctional training platform for commercial vehicle pneumatic brake system according to claim 1, characterized in that: The support plate (3) comprises a transverse plate (31) and connecting rods (34) located at four corners of the transverse plate (31); a plurality of trapezoidal straight grooves (32) are provided at equal intervals in a straight line on the transverse plate (31) below the sliding plate (4); guide straight rods (33) are installed at positions on both sides of the trapezoidal straight grooves (32) to facilitate the linear movement of the sliding plate (4).

3. The multifunctional training platform for the pneumatic brake system of commercial vehicles according to claim 2, characterized in that: The sliding plate (4) comprises a longitudinal plate (41) which moves linearly along the guide straight rod (33), a plurality of trapezoidal straight bars (42) are installed below the longitudinal plate (41), a plurality of pulleys (43) are installed on one side of the trapezoidal straight bars (42), the trapezoidal straight bars (42) and the pulleys (43) are arranged at intervals, and the trapezoidal straight bars (42) and the pulleys (43) are both located inside the trapezoidal straight groove (32) and move linearly inward and outward along the guide straight rod (33).

4. The multifunctional training platform for commercial vehicle pneumatic brake system according to claim 2, characterized in that: The end of the connecting rod (34) is connected to the sliding seat (8), and two limiting rails (7) are provided on the surface of each of the fixing plates (2). Two groups of stabilizing components (5) are installed inside each of the limiting rails (7). The two groups of stabilizing components (5) are symmetrically arranged on the upper and lower sides of the sliding seat (8), and the two groups of stabilizing components (5) are interconnected to form an oil path for the flow of internal hydraulic oil.

5. The multifunctional training platform for commercial vehicle pneumatic brake system according to claim 4, characterized in that: The stabilizing component (5) comprises a telescopic oil bag (51), an oil storage tank (52), an extrusion plate (53) and a connecting pipe (54); the telescopic oil bag (51) is connected to the oil storage tank (52) and is located inside the limiting track (7); the end of the telescopic oil bag (51) is sealed and mounted with the extrusion plate (53); one end of the connecting pipe (54) is connected to the bottom of the oil storage tank (52); the other end of the connecting pipe (54) passes through the limiting track (7) and extends to the outside to be connected to the stacked connecting pipes (54) to form an oil circuit.

6. The multifunctional training platform for commercial vehicle pneumatic brake system according to claim 4, characterized in that: A plurality of groups of buffer components (6) are installed on the outer side of the limiting track (7), each group of buffer components (6) comprises a second connecting rod (61), a first buffer spring (62) and a second buffer spring (63), the second connecting rod (61) passes through the sliding seat (8) and is respectively connected to the inner top wall and the inner bottom wall of the limiting track (7), the first buffer spring (62) is sleeved and installed at a position where the second connecting rod (61) is located below the sliding seat (8), and the second buffer spring (63) is sleeved and installed at a position where the second connecting rod (61) is located above the sliding seat (8).

7. The multifunctional training platform for commercial vehicle pneumatic brake system according to claim 4, characterized in that: T-shaped limit blocks (9) are arranged on both side walls of the sliding seat (8), and T-shaped limit grooves (10) are linearly provided on both side walls of the inner side of the limit track (7) at positions corresponding to the T-shaped limit blocks (9), and the sliding seat (8) maintains upper and lower limits by means of the T-shaped limit blocks (9) embedded in the T-shaped limit grooves (10).

8. The multifunctional training platform for commercial vehicle pneumatic brake system according to claim 1, characterized in that: A trailer brake system for simulating trailer braking is installed at the rear of the test bench (1), the trailer brake system comprising a first bridge brake air chamber (11) simulating a first bridge of a trailer, a second bridge brake air chamber (12) simulating a second bridge of a trailer, and a third bridge brake air chamber (13) simulating a third bridge of a trailer, a third bridge synchronization valve (14) for supplying air for parking brake is installed between the first bridge brake air chamber (11) and the second bridge brake air chamber (12), and a trailer air reservoir (15) for supplying air for releasing parking brake is installed between the second bridge brake air chamber (12) and the third bridge brake air chamber (13).

9. The multifunctional training platform for commercial vehicle pneumatic brake system according to claim 8, characterized in that: The first bridge brake air chamber (11), the second bridge brake air chamber (12) and the third bridge brake air chamber (13) are each provided in two, and the three are sequentially distributed along the rear of the platform (1); a first air supply pipe (16) is installed between the three-bridge synchronization valve (14) and the trailer air reservoir (15) and are connected; a second air supply pipe (17) is installed between the trailer air reservoir (15) and the second bridge brake air chamber (12) and the third bridge brake air chamber (13) and are connected; a third air supply pipe (18) is installed between the three-bridge synchronization valve (14) and the third bridge brake air chamber (13) and are connected; and the other side of the three-bridge synchronization valve (14) is sequentially connected to a control pipeline (19) and an air intake pipe (20) up and down.

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