A heavy-duty tractor and semitrailer braking system training platform

Abstract

The utility model discloses a heavy tractor and semitrailer braking system practical training platform, including tractor platform body, semitrailer platform body, set up on the tractor platform body's tractor brake mechanism, set up on the semitrailer platform body's semitrailer brake mechanism, always open indicating lamp band, control indicating lamp band, execution indicating lamp band and controller, always open indicating lamp band is set up on the always open gas path of tractor brake mechanism and semitrailer brake mechanism, control indicating lamp band is set up on the control gas path, execution indicating lamp band is set up on the execution gas path, and the controller is through the linkage control of different pressure switch always open indicating lamp band, control indicating lamp band and execution indicating lamp band's lighting. The utility model is provided with the indicating lamp band of different colors on the gas path of different functions respectively, and the conduction state of different function gas paths can be visualized and displayed in real time, better understand the working principle of heavy tractor and semitrailer braking system, improve learning effect.

Description

Technical Field

[0001] This utility model relates to the field of automotive training equipment technology, specifically a training platform for the braking system of heavy-duty tractors and semi-trailers. Background Technology

[0002] A heavy-duty tractor-trailer consists of a tractor unit and a semi-trailer. The semi-trailer is connected to the rear of the tractor unit, which provides power to drive the semi-trailer in a synchronized manner. The braking system, as a crucial component of a vehicle, plays a vital role in its development.

[0003] In the process of vocational teaching, students are guided to learn through training platforms. However, the existing training platforms for heavy-duty tractor and semi-trailer braking systems have the following technical defects: (1) Most of the existing training equipment uses single system simulation, which makes it difficult to reflect the collaborative working principle of the tractor and semi-trailer composite braking system; (2) It lacks the function of visualizing the air circuit process, so students cannot understand and master the braking working principle well, which greatly reduces the learning effect. Utility Model Content

[0004] The technical problem this utility model aims to solve is to provide a training platform for the braking system of heavy-duty tractors and semi-trailers. Different colored indicator lights are set on the air circuits with different functions to visually display the conduction status of different functional air circuits in real time, so as to better understand the working principle of the braking system of heavy-duty tractors and semi-trailers and improve the learning effect.

[0005] The technical solution of this utility model is as follows:

[0006] A training platform for a heavy-duty tractor and semi-trailer braking system includes a tractor platform body, a semi-trailer platform body, a tractor braking mechanism mounted on the tractor platform body, a semi-trailer braking mechanism mounted on the semi-trailer platform body, a normally open indicator light strip, a control indicator light strip, an execution indicator light strip, and a controller.

[0007] The aforementioned tractor braking mechanism includes a four-circuit protection valve, a tractor main air tank, a tractor auxiliary air tank, a parking brake valve, a trailer valve, a semi-trailer brake valve, a service brake master cylinder, a tractor service brake relay valve, a tractor parking relay valve, a tractor compound brake chamber, a normally open air circuit pressure switch, a parking brake control pressure switch, a service brake control pressure switch, and a semi-trailer brake control pressure switch. The air inlet of the four-circuit protection valve is connected to an air source. The air inlets of the tractor main air tank, tractor auxiliary air tank, parking brake valve, trailer valve, semi-trailer brake valve, and service brake master cylinder are all connected to the air outlet of the four-circuit protection valve through normally open air circuits. The air inlets of the tractor service brake relay valve and the tractor parking relay valve are both connected to the air outlet of the tractor main air tank through normally open air circuits. The air ports are connected as follows: the control interface of the tractor parking relay valve is connected to the air outlet of the parking brake valve through the control air circuit; the air outlets of the semi-trailer brake valve and the service brake master cylinder are both connected to the control interface of the tractor service brake relay valve through the control air circuit; the air outlets of the semi-trailer brake valve and the service brake master cylinder are both connected to the control interface of the trailer valve through the control air circuit; the air outlets of the tractor service brake relay valve and the tractor parking relay valve are both connected to the tractor compound brake chamber through the execution air circuit; the normally open air circuit pressure switch is located at the air outlet of the four-circuit protection valve; the parking brake control pressure switch is located at the air outlet of the parking brake valve; the service brake control pressure switch is located at the air outlet of the service brake master cylinder; and the semi-trailer brake control pressure switch is located at the air outlet of the semi-trailer brake valve.

[0008] The semi-trailer braking mechanism includes a semi-trailer air tank, a semi-trailer service brake relay valve, a semi-trailer parking relay valve, and a semi-trailer brake chamber. The air inlet of the semi-trailer air tank is connected to the air outlet of the trailer valve through a normally open air passage. The air inlets of the semi-trailer service brake relay valve and the semi-trailer parking relay valve are both connected to the air outlet of the semi-trailer air tank through normally open air passages. The control interface of the semi-trailer parking relay valve is connected to the air outlet of the parking brake valve through a control air passage. The control interface of the semi-trailer service brake relay valve is connected to the air outlet of the trailer valve. The air outlets of the semi-trailer service brake relay valve and the semi-trailer parking relay valve are both connected to the semi-trailer brake chamber through an execution air passage.

[0009] The outer wall of the normally open air circuit is equipped with a normally open indicator light strip, the outer wall of the control air circuit is equipped with a control indicator light strip, and the outer wall of the execution air circuit is equipped with an execution indicator light strip. The normally open indicator light strip, the control indicator light strip, and the execution indicator light strip are different colors. The normally open air circuit pressure switch, the parking brake control pressure switch, the service brake control pressure switch, the semi-trailer brake control pressure switch, the normally open indicator light strip, the control indicator light strip, and the execution indicator light strip are all connected to the controller.

[0010] All connecting air lines in the tractor braking mechanism and the semi-trailer braking mechanism are made of high-pressure air pipes, and the joints at both ends of the high-pressure air pipes are quick-connect joints; the connecting air line between the tractor braking mechanism and the semi-trailer braking mechanism is made of spiral high-pressure air pipe.

[0011] The main air tank of the tractor unit includes a front axle air tank and a rear axle air tank. The air inlet of the front axle air tank, the first air inlet of the semi-trailer brake valve, and the first air inlet of the service brake master cylinder are all connected to the first air outlet of the four-circuit protection valve through a normally open air passage. The air inlet of the rear axle air tank, the second air inlet of the semi-trailer brake valve, and the second air inlet of the service brake master cylinder are all connected to the second air outlet of the four-circuit protection valve through a normally open air passage. The air inlet of the auxiliary air tank, the air inlet of the parking brake valve, and the air inlet of the trailer valve are all connected to the third air outlet of the four-circuit protection valve through a normally open air passage.

[0012] The tractor unit has two service brake relay valves, namely a first tractor unit service brake relay valve and a second tractor unit service brake relay valve; the tractor unit also has two parking relay valves, namely a first tractor unit parking relay valve and a second tractor unit parking relay valve; the air inlets of both the first tractor unit service brake relay valve and the first tractor unit parking relay valve are connected to the air outlet of the tractor unit's front axle air tank via normally open air lines, and the air inlets of both the second tractor unit service brake relay valve and the second tractor unit parking relay valve are connected to the air outlet of the tractor unit's rear axle air tank via normally open air lines. The first air outlet of the semi-trailer brake valve and the first air outlet of the service brake master cylinder... Each air outlet is connected to the control interface of the first tractor's service brake relay valve via a control air circuit. The second air outlet of the semi-trailer brake valve and the second air outlet of the service brake master cylinder are both connected to the control interface of the second tractor's service brake relay valve via a control air circuit. The control interfaces of the first tractor's parking relay valve and the second tractor's parking relay valve are both connected to the air outlet of the parking brake valve via a control air circuit. The air outlets of the first or second tractor's service brake relay valve and the parking relay valve of the first or second tractor are all connected to the tractor's compound brake chamber via an execution air circuit.

[0013] The tractor braking mechanism also includes two bidirectional single-way valves. The first air outlet of the semi-trailer brake valve and the first air outlet of the service brake master cylinder are respectively connected to the two air inlets of one of the bidirectional single-way valves through a control air circuit. The air outlet of one of the bidirectional single-way valves is connected to the first control interface of the trailer valve through a control air circuit. The second air outlet of the semi-trailer brake valve and the second air outlet of the service brake master cylinder are respectively connected to the two air inlets of the other bidirectional single-way valve through a control air circuit. The air outlet of the other bidirectional single-way valve is connected to the second control interface of the trailer valve through a control air circuit.

[0014] The semi-trailer has two air tanks: one for the front axle and one for the rear axle. It also has two service brake relay valves: a first service brake relay valve and a second service brake relay valve. The air inlets of both the front and rear axle air tanks are connected to the first outlet of the trailer valve via a normally open air passage. The air inlet of the first service brake relay valve is connected to the outlet of the front axle air tank via a normally open air passage. The air inlet of the second service brake relay valve is connected to... The air outlet of the air tank of the semi-trailer rear axle is connected to the control interface of the first semi-trailer service brake relay valve and the control interface of the second semi-trailer service brake relay valve, which are both connected to the second air outlet of the trailer valve. The semi-trailer brake chamber includes a semi-trailer compound brake chamber and a semi-trailer single diaphragm brake chamber. The air outlets of the first semi-trailer service brake relay valve and the semi-trailer parking relay valve are both connected to the semi-trailer compound brake chamber through an actuation air circuit, and the air outlet of the second semi-trailer service brake relay valve is connected to the semi-trailer single diaphragm brake chamber through an actuation air circuit.

[0015] The tractor braking mechanism also includes multiple tractor wheels, each connected to a corresponding tractor composite brake chamber. The semi-trailer braking mechanism also includes multiple semi-trailer wheels, each connected to a corresponding semi-trailer brake chamber.

[0016] Advantages of this utility model:

[0017] (1) This utility model sets indicator lights of different colors on the normally open air circuit, control air circuit and execution air circuit of the tractor braking mechanism and the semi-trailer braking mechanism. When the indicator light is lit, it indicates that the corresponding air circuit is open. When the indicator light is off, it indicates that the corresponding air circuit is closed and no gas is introduced. This allows trainees to visually grasp the conduction status of different functional air circuits, better understand the working principle of the heavy tractor and semi-trailer braking system, and improve the learning effect.

[0018] (2) All connecting air lines in the tractor braking mechanism and semi-trailer braking mechanism of this utility model are made of high-pressure air pipes. The connectors at both ends of the high-pressure air pipes are quick-connect connectors. Trainees can quickly connect the corresponding connecting air lines to the corresponding components through the quick-connect connectors, improve trainees' hands-on ability, and achieve rapid disassembly and assembly training. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the structure of this utility model.

[0020] Figure 2 This is a schematic diagram of the tractor braking mechanism of this utility model.

[0021] Figure 3This is a structural schematic diagram of the semi-trailer braking mechanism of this utility model.

[0022] Figure 4 This is a schematic diagram of the structure of the indicator light strip of this utility model being installed on the outer wall of a high-pressure gas pipe.

[0023] Reference numerals: 1-Tractor platform body, 2-Semi-trailer platform body, 31-Four-circuit protection valve, 32-Tractor front axle air tank, 33-Tractor rear axle air tank, 34-Tractor auxiliary air tank, 35-Parking brake valve, 36-Trailer valve, 37-Semi-trailer brake valve, 38-Service brake master cylinder, 39-Two-way single-pass valve, 310-First tractor service brake relay valve, 311-Second tractor service brake relay valve, 312-First tractor parking relay valve, 313-Second tractor parking relay valve, 314-Tractor composite brake... 315 - Tractor wheel; 316 - Normally open air circuit pressure switch; 317 - Parking brake control pressure switch; 318 - Service brake control pressure switch; 319 - Semi-trailer brake control pressure switch; 41 - Semi-trailer front axle air tank; 42 - Semi-trailer rear axle air tank; 43 - First semi-trailer service brake relay valve; 44 - Second semi-trailer service brake relay valve; 45 - Semi-trailer parking relay valve; 46 - Semi-trailer compound brake chamber; 47 - Semi-trailer single diaphragm brake chamber; 48 - Semi-trailer wheel; 5 - High-pressure air pipe; 6 - Indicator light strip. Detailed Implementation

[0024] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0025] See Figures 1-4 :

[0026] A training platform for a heavy-duty tractor and semi-trailer braking system includes a tractor platform body 1, a semi-trailer platform body 2, a tractor braking mechanism mounted on the tractor platform body 1, a semi-trailer braking mechanism mounted on the semi-trailer platform body 2, a normally open indicator light strip, a control indicator light strip, an execution indicator light strip, and a controller.

[0027] The tractor braking mechanism includes a four-circuit protection valve 31, a front axle air tank 32, a rear axle air tank 33, an auxiliary air tank 34, a parking brake valve 35, a trailer valve 36, a semi-trailer brake valve 37, a service brake master cylinder 38, two two-way single-pass valves 39, a first tractor service brake relay valve 310, a second tractor service brake relay valve 311, a first tractor parking relay valve 312, a second tractor parking relay valve 313, six tractor compound brake chambers 314, six tractor wheels 315, three normally open air circuit pressure switches 316, a parking brake control pressure switch 317, a service brake control pressure switch 318, and a semi-trailer brake control pressure switch 319; the air inlet of the four-circuit protection valve 31. The air inlet a of the tractor's front axle air tank 32, the first air inlet a1 of the semi-trailer brake valve 37, and the first air inlet a1 of the service brake master cylinder 38 are all connected to the first air outlet b1 of the four-circuit protection valve 31 through a normally open air passage. The air inlet a of the tractor's rear axle air tank 33, the second air inlet a2 of the semi-trailer brake valve 37, and the second air inlet a2 of the service brake master cylinder 38 are all connected to the second air outlet b2 of the four-circuit protection valve 31 through a normally open air passage. The air inlet a of the tractor's auxiliary air tank 34, the air inlet a of the parking brake valve 35, and the air inlet a of the trailer valve 36 are all connected to the third air outlet b3 of the four-circuit protection valve 31 through a normally open air passage. The first tractor's service brake relay valve 310 and the first tractor's parking relay valve are also connected to the air inlet a of the four-circuit protection valve 31. The air inlet a of valve 312 is connected to the air outlet b of the air tank 32 of the tractor's front axle via a normally open air passage. The air inlets a of the second tractor's service brake relay valve 311 and the second tractor's parking relay valve 313 are connected to the air outlet b of the air tank 33 of the tractor's rear axle via a normally open air passage. The first air outlet b1 of the semi-trailer brake valve 37 and the first air outlet b1 of the service brake master cylinder 38 are respectively connected to the two air inlets of one of the two-way single-pass valves 39 via a control air passage. The air outlet b of one of the two-way single-pass valves 39 is connected to the first control interface c1 of the trailer valve 36 via a control air passage. The first air outlet b1 of the semi-trailer brake valve 37 and the first air outlet b1 of the service brake master cylinder 38 are both connected to the first tractor's service brake relay valve via a control air passage. The control interface c of 310 is connected. The second air outlet b2 of the semi-trailer brake valve 37 and the second air outlet b2 of the service brake master cylinder 38 are respectively connected to the two air inlets of another two-way single-pass valve 39 through the control air circuit. The air outlet b of the other two-way single-pass valve 39 is connected to the second control interface c2 of the trailer valve 36 through the control air circuit. The second air outlet b2 of the semi-trailer brake valve 37 and the second air outlet b2 of the service brake master cylinder 38 are both connected to the control interface c of the second tractor vehicle service brake relay valve 311 through the control air circuit. The control interfaces c of the first tractor vehicle parking relay valve 312 and the second tractor vehicle parking relay valve 313 are both connected to the air outlet b of the parking brake valve 35 through the control air circuit. In the first two tractor vehicle compound brake chambers 314,Each tractor compound brake chamber 314 is connected to the outlet b of the first tractor service brake relay valve 310 and the first tractor parking relay valve 312 via an actuation air circuit. Of the last four tractor compound brake chambers 314, each is connected to the outlet b of the second tractor service brake relay valve 311 and the second tractor parking relay valve 313 via an actuation air circuit. The six tractor wheels 315 are respectively connected to the six tractor compound brake chambers 314. 14. A one-to-one correspondence is established: three normally open air circuit pressure switches 316 are respectively located at the first air outlet b1, the second air outlet b2, and the third air outlet b3 of the four-circuit protection valve 31; the parking brake control pressure switch 317 is located at the air outlet b of the parking brake valve 35; the service brake control pressure switch 318 is located at the first air outlet b1 of the service brake master cylinder 38; and the semi-trailer brake control pressure switch 319 is located at the second air outlet b2 of the semi-trailer brake valve 37.

[0028] The semi-trailer braking mechanism includes a front axle air tank 41, a rear axle air tank 42, a first semi-trailer service brake relay valve 43, a second semi-trailer service brake relay valve 44, a semi-trailer parking relay valve 45, four semi-trailer compound brake chambers 46, four semi-trailer single diaphragm brake chambers 47, and eight semi-trailer wheels 48. The air inlets a of the semi-trailer brake chambers, the front axle air tank 41, and the rear axle air tank 42 are all connected to the first air outlet b1 of the trailer valve 36 via normally open air passages. The air inlet a of the first semi-trailer service brake relay valve 43 is connected to the air outlet b of the front axle air tank 41 via a normally open air passage. The air inlet a of the second semi-trailer service brake relay valve 44 is connected to the air outlet b of the rear axle air tank 46 via a normally open air passage. The air outlet b of 2 is connected, the control interface c of the first semi-trailer service brake relay valve 43 and the control interface c of the second semi-trailer service brake relay valve 44 are both connected to the second air outlet b2 of the trailer valve 36, the control interface c of the semi-trailer parking relay valve 45 is connected to the air outlet b of the parking brake valve 35 through the control air circuit, each semi-trailer compound brake chamber 46 is connected to the air outlet b of the first semi-trailer service brake relay valve 43 and the air outlet b of the semi-trailer parking relay valve 45 through the execution air circuit, each semi-trailer single diaphragm brake chamber 47 is connected to the air outlet b of the second semi-trailer service brake relay valve 44 through the execution air circuit, and the eight semi-trailer wheels 48 are respectively connected to the semi-trailer brake chambers or the semi-trailer single diaphragm brake chambers 47 one by one;

[0029] Normally open air circuits are equipped with normally open indicator light strips (blue light strips) on the outer wall of the air circuit, control air circuits are equipped with control indicator light strips (yellow light strips) on the outer wall of the air circuit, and execution air circuits are equipped with execution indicator light strips (red light strips) on the outer wall of the air circuit. The three normally open air circuit pressure switches 316, parking brake control pressure switch 317, service brake control pressure switch 318, semi-trailer brake control pressure switch 319, normally open indicator light strips, control indicator light strips, and execution indicator light strips are all connected to the controller.

[0030] All connecting air lines (including normally open air lines, control air lines, and execution air lines) in the tractor braking mechanism and the semi-trailer braking mechanism are made of high-pressure air pipes (working pressure range 0-10 bar). The high-pressure air pipes 5 corresponding to the normally open air lines, control air lines, and execution air lines are provided with indicator light strips 6 of corresponding colors (blue light strip, yellow light strip, or red light strip) extending along the pipe axis on the outer wall. The connectors at both ends of the high-pressure air pipes are all 8mm PU quick-connect connectors. The connecting air lines between the tractor braking mechanism and the semi-trailer braking mechanism are made of spiral high-pressure air pipes.

[0031] When the gas source is supplied, all normally open gas paths are always open. The first outlet b1, the second outlet b2, and the third outlet b3 of the four-circuit protection valve 31 are open and the gas pressure is greater than 5 bar. The three normally open gas path pressure switches 316 at the three outlets of the four-circuit protection valve 31 are opened and send signals to the controller. The controller controls the blue lights on all normally open indicator lights to light up.

[0032] The indicator light strip illuminates under different states in this utility model:

[0033] 1. The vehicle is in a parked state (i.e., in a parked state):

[0034] At this time, the parking brake valve 35 is opened, the air circuit of the parking brake valve 35 is disconnected, the air pressure at the outlet b of the parking brake valve 35 is not greater than 5 bar, the parking brake control pressure switch 317 at the outlet of the parking brake valve 35 is closed, and the parking brake control pressure switch 317 at the outlet b of the parking brake valve 35 is closed. At this time, the yellow light on the control indicator strip of the execution air circuit connected to the parking brake valve 35 and the first tractor parking relay valve 312, the second tractor parking relay valve 313, and the semi-trailer parking relay valve 45 respectively remains off, and at the same time, the red light on the execution indicator strip of the corresponding connected execution air circuit also remains off.

[0035] 2. When the vehicle is in motion:

[0036] At this time, when the parking brake valve 35 is released, the air passage of the parking brake valve 35 is opened, the air outlet b of the parking brake valve 35 is vented and the air pressure is greater than 5 bar. The parking brake control pressure switch 317 at the air outlet b of the parking brake valve 35 is turned on and sends a signal to the controller. The controller controls the control indicator strips on the execution air lines connected to the parking brake valve 35 with the first tractor parking relay valve 312, the second tractor parking relay valve 313 and the semi-trailer parking relay valve 45 to light up. At the same time, the execution indicator strips on the execution air lines connected to the air outlet b of the first tractor parking relay valve 312, the second tractor parking relay valve 313 and the semi-trailer parking relay valve 45 are lit up.

[0037] 3. When the vehicle is in motion and the foot brake is applied:

[0038] At this time, the parking brake valve 35 remains in the released state, while the service brake master cylinder 38 is activated. Both air outlets b of the service brake master cylinder 38 are open and the air pressure is greater than 5 bar. The service brake control pressure switch 318 at the air outlet b of the service brake master cylinder 38 is activated and sends a signal to the controller. The controller controls the control air path between the two air outlets b1 and b2 of the service brake master cylinder 38 and the air inlets of the two bidirectional one-way valves 39, the control air path between the two air outlets of the service brake master cylinder 38 and the control interface c of the first tractor service brake relay valve 310 and the second tractor service brake relay valve 311, and the two bidirectional one-way valves 39. The control indicator lights on the control air paths between the air outlets of the 9th and the two control interfaces c1 and c2 of the trailer valve 36, the control air path between the second air outlet b2 of the trailer valve 36 and the control interface c of the first semi-trailer travel brake relay valve 43, and the control air path between the second air outlet b2 of the trailer valve 36 and the control interface c of the second semi-trailer travel brake relay valve 44 are illuminated. At the same time, the execution indicator lights on the execution air paths connected to the air outlet b of the first tractor travel brake relay valve 310, the second tractor travel brake relay valve 311, the first semi-trailer travel brake relay valve 43, and the second semi-trailer travel brake relay valve 44 are illuminated.

[0039] 4. Semi-trailer braking status:

[0040] At this time, the semi-trailer brake valve 37 is activated, and both air outlets b1 and b2 of the semi-trailer brake valve 37 are ventilated with an air pressure greater than 5 bar. The semi-trailer brake control pressure switch 319 at the second air outlet b2 of the semi-trailer brake valve 37 is opened and sends a signal to the controller. The controller controls the control air paths between the two air outlets b1 and b2 of the semi-trailer brake valve 37 and the air inlets of the two bidirectional single-way valves 39, the control air paths between the air outlets b1 and b2 of the two bidirectional single-way valves 39 and the two control interfaces c1 and c2 of the trailer valve 36, and the trailer... The control indicator lights on the control air circuit between the second air outlet b2 of valve 36 and the control interface c of the first semi-trailer travel brake relay valve 43, and between the second air outlet b2 of trailer valve 36 and the control interface c of the second semi-trailer travel brake relay valve 44, illuminate. At the same time, the execution indicator lights on the execution air circuits connected to the air outlet b of the first tractor travel brake relay valve 310, the second tractor travel brake relay valve 311, the first semi-trailer travel brake relay valve 43, and the second semi-trailer travel brake relay valve 44 illuminate.

[0041] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A training platform for braking systems of heavy-duty tractors and semi-trailers, characterized in that: It includes a tractor platform body, a semi-trailer platform body, a tractor braking mechanism mounted on the tractor platform body, a semi-trailer braking mechanism mounted on the semi-trailer platform body, a normally open indicator light strip, a control indicator light strip, an execution indicator light strip, and a controller. The aforementioned tractor braking mechanism includes a four-circuit protection valve, a tractor main air tank, a tractor auxiliary air tank, a parking brake valve, a trailer valve, a semi-trailer brake valve, a service brake master cylinder, a tractor service brake relay valve, a tractor parking relay valve, a tractor compound brake chamber, a normally open air circuit pressure switch, a parking brake control pressure switch, a service brake control pressure switch, and a semi-trailer brake control pressure switch. The air inlet of the four-circuit protection valve is connected to an air source. The air inlets of the tractor main air tank, tractor auxiliary air tank, parking brake valve, trailer valve, semi-trailer brake valve, and service brake master cylinder are all connected to the air outlet of the four-circuit protection valve through normally open air circuits. The air inlets of the tractor service brake relay valve and the tractor parking relay valve are both connected to the air outlet of the tractor main air tank through normally open air circuits. The air ports are connected as follows: the control interface of the tractor parking relay valve is connected to the air outlet of the parking brake valve through the control air circuit; the air outlets of the semi-trailer brake valve and the service brake master cylinder are both connected to the control interface of the tractor service brake relay valve through the control air circuit; the air outlets of the semi-trailer brake valve and the service brake master cylinder are both connected to the control interface of the trailer valve through the control air circuit; the air outlets of the tractor service brake relay valve and the tractor parking relay valve are both connected to the tractor compound brake chamber through the execution air circuit; the normally open air circuit pressure switch is located at the air outlet of the four-circuit protection valve; the parking brake control pressure switch is located at the air outlet of the parking brake valve; the service brake control pressure switch is located at the air outlet of the service brake master cylinder; and the semi-trailer brake control pressure switch is located at the air outlet of the semi-trailer brake valve. The semi-trailer braking mechanism includes a semi-trailer air tank, a semi-trailer service brake relay valve, a semi-trailer parking relay valve, and a semi-trailer brake chamber. The air inlet of the semi-trailer air tank is connected to the air outlet of the trailer valve through a normally open air passage. The air inlets of the semi-trailer service brake relay valve and the semi-trailer parking relay valve are both connected to the air outlet of the semi-trailer air tank through normally open air passages. The control interface of the semi-trailer parking relay valve is connected to the air outlet of the parking brake valve through a control air passage. The control interface of the semi-trailer service brake relay valve is connected to the air outlet of the trailer valve. The air outlets of the semi-trailer service brake relay valve and the semi-trailer parking relay valve are both connected to the semi-trailer brake chamber through an execution air passage. The outer wall of the normally open air circuit is equipped with a normally open indicator light strip, the outer wall of the control air circuit is equipped with a control indicator light strip, and the outer wall of the execution air circuit is equipped with an execution indicator light strip. The normally open indicator light strip, the control indicator light strip, and the execution indicator light strip are different colors. The normally open air circuit pressure switch, the parking brake control pressure switch, the service brake control pressure switch, the semi-trailer brake control pressure switch, the normally open indicator light strip, the control indicator light strip, and the execution indicator light strip are all connected to the controller.

2. The heavy-duty tractor and semi-trailer braking system training platform according to claim 1, characterized in that: All connecting air lines in the tractor braking mechanism and the semi-trailer braking mechanism are made of high-pressure air pipes, and the joints at both ends of the high-pressure air pipes are quick-connect joints; the connecting air line between the tractor braking mechanism and the semi-trailer braking mechanism is made of spiral high-pressure air pipe.

3. The heavy-duty tractor and semi-trailer braking system training platform according to claim 1, characterized in that: The main air tank of the tractor unit includes a front axle air tank and a rear axle air tank. The air inlet of the front axle air tank, the first air inlet of the semi-trailer brake valve, and the first air inlet of the service brake master cylinder are all connected to the first air outlet of the four-circuit protection valve through a normally open air passage. The air inlet of the rear axle air tank, the second air inlet of the semi-trailer brake valve, and the second air inlet of the service brake master cylinder are all connected to the second air outlet of the four-circuit protection valve through a normally open air passage. The air inlet of the auxiliary air tank, the air inlet of the parking brake valve, and the air inlet of the trailer valve are all connected to the third air outlet of the four-circuit protection valve through a normally open air passage.

4. The heavy-duty tractor and semi-trailer braking system training platform according to claim 3, characterized in that: The tractor unit has two service brake relay valves, namely a first tractor unit service brake relay valve and a second tractor unit service brake relay valve; the tractor unit also has two parking relay valves, namely a first tractor unit parking relay valve and a second tractor unit parking relay valve; the air inlets of both the first tractor unit service brake relay valve and the first tractor unit parking relay valve are connected to the air outlet of the tractor unit's front axle air tank via normally open air lines, and the air inlets of both the second tractor unit service brake relay valve and the second tractor unit parking relay valve are connected to the air outlet of the tractor unit's rear axle air tank via normally open air lines. The first air outlet of the semi-trailer brake valve and the first air outlet of the service brake master cylinder... Each air outlet is connected to the control interface of the first tractor's service brake relay valve via a control air circuit. The second air outlet of the semi-trailer brake valve and the second air outlet of the service brake master cylinder are both connected to the control interface of the second tractor's service brake relay valve via a control air circuit. The control interfaces of the first tractor's parking relay valve and the second tractor's parking relay valve are both connected to the air outlet of the parking brake valve via a control air circuit. The air outlets of the first or second tractor's service brake relay valve and the parking relay valve of the first or second tractor are all connected to the tractor's compound brake chamber via an execution air circuit.

5. The heavy-duty tractor and semi-trailer braking system training platform according to claim 4, characterized in that: The tractor braking mechanism also includes two bidirectional single-way valves. The first air outlet of the semi-trailer brake valve and the first air outlet of the service brake master cylinder are respectively connected to the two air inlets of one of the bidirectional single-way valves through a control air circuit. The air outlet of one of the bidirectional single-way valves is connected to the first control interface of the trailer valve through a control air circuit. The second air outlet of the semi-trailer brake valve and the second air outlet of the service brake master cylinder are respectively connected to the two air inlets of the other bidirectional single-way valve through a control air circuit. The air outlet of the other bidirectional single-way valve is connected to the second control interface of the trailer valve through a control air circuit.

6. The heavy-duty tractor and semi-trailer braking system training platform according to claim 1, characterized in that: The semi-trailer has two air tanks: one for the front axle and one for the rear axle. It also has two service brake relay valves: a first service brake relay valve and a second service brake relay valve. The air inlets of both the front and rear axle air tanks are connected to the first outlet of the trailer valve via a normally open air passage. The air inlet of the first service brake relay valve is connected to the outlet of the front axle air tank via a normally open air passage. The air inlet of the second service brake relay valve is connected to... The air outlet of the air tank of the semi-trailer rear axle is connected to the control interface of the first semi-trailer service brake relay valve and the control interface of the second semi-trailer service brake relay valve, which are both connected to the second air outlet of the trailer valve. The semi-trailer brake chamber includes a semi-trailer compound brake chamber and a semi-trailer single diaphragm brake chamber. The air outlets of the first semi-trailer service brake relay valve and the semi-trailer parking relay valve are both connected to the semi-trailer compound brake chamber through an actuation air circuit, and the air outlet of the second semi-trailer service brake relay valve is connected to the semi-trailer single diaphragm brake chamber through an actuation air circuit.

7. The heavy-duty tractor and semi-trailer braking system training platform according to claim 1, characterized in that: The tractor braking mechanism also includes multiple tractor wheels, each connected to a corresponding tractor composite brake chamber. The semi-trailer braking mechanism also includes multiple semi-trailer wheels, each connected to a corresponding semi-trailer brake chamber.

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