Pneumatic brake system for heavy-duty truck to get out of trouble on road

Abstract

The utility model relates to an air brake system for road rescue of a heavy-duty truck. The air brake system solves the problem that road rescue is difficult. The dryer (8) is connected with a port 1 of the four-loop protection valve (12); a port 21 of the four-loop protection valve (12) is connected with a rear-loop service brake gas cylinder (9); a port 22 is connected with a front loop service brake gas cylinder (10); a port 23 is connected with a parking brake gas cylinder (11); a 24 port is connected with the distribution valve (3); two one-way valves are arranged between the 21 port and the 22 port; a one-way valve is arranged between a 23 port and a 21 port of the four-loop protection valve (12); a separating switch (5) and a pneumatic brake joint (6) are respectively arranged on the lower sides of the bumper bracket and the tail cross beam seat; a separation switch (5) on a bumper is connected to a front loop service brake cylinder (10); and the separation switch (5) on the tail cross beam is connected to the distribution valve (3). The road rescue time is shortened, the structure is simple, and the cost is low.

Description

Technical Field

[0001] This utility model relates to a braking system, specifically a pneumatic braking system for heavy-duty trucks to get out of trouble on roads. Background Technology

[0002] In recent years, the number of road traffic accidents, traffic fatalities, and direct property losses in my country have remained high, posing a serious threat to the lives and property of the Chinese public. The design and function of existing road rescue equipment, particularly towing devices, only meet basic towing and clearing needs and cannot provide rapid and effective rescue for heavy-duty trucks.

[0003] Heavy-duty trucks use air brakes, with compressed air generated by an air compressor connected to the engine for power take-off. When the powertrain of a heavy-duty truck malfunctions, the air compressor cannot operate, and due to the limited air storage capacity in the brake system's cylinders, it is impossible to use tow hooks and tow ropes to extricate the truck from a stuck situation. Existing road rescue methods typically use large flatbed trucks for hoisting and transport, which faces problems such as long clearance times, high rescue costs, limitations imposed by complex terrain, and an increased risk of secondary accidents. Utility Model Content

[0004] This utility model optimizes the air circuit design of the braking system of heavy-duty trucks, adding the function of providing braking air source for towed vehicles. It solves the problems of existing heavy-duty truck road rescue, which usually uses large flatbed trucks for hoisting and transport, resulting in long clearing time, high rescue cost, hoisting restrictions due to complex terrain, and easy secondary accidents.

[0005] This utility model is achieved through the following technical solution:

[0006] A pneumatic braking system for road extrication of heavy-duty trucks includes a compressed air pipe (1), a frame pipe (2), a distribution valve (3), a service relay valve (4), a disconnect switch (5), a pneumatic brake connector (6), a parking relay valve (7), a dryer (8), a rear circuit service brake cylinder (9), a front circuit service brake cylinder (10), a parking brake cylinder (11), and a four-circuit protection valve (12).

[0007] Compressed air is cooled by compressed air pipe (1) and frame pipe (2), and after being dried by dryer (8), it is connected to the air inlet 1 of four-circuit protection valve (12) to supply air to four-circuit protection valve (12); the first air inlet 21 of four-circuit protection valve (12) is connected to the rear circuit service brake cylinder (9), and supplies air to the rear axle service brake chamber through service relay valve (4) to perform service braking; the second air inlet 22 of four-circuit protection valve (12) is connected to the front circuit service brake cylinder (10), and supplies air to the front axle service brake chamber to perform service braking; the third air inlet 23 of four-circuit protection valve (12) is connected to the parking brake cylinder (11), and supplies air to the parking brake chamber through parking relay valve (7) to release parking. Braking; the fourth air inlet 24 of the four-circuit protection valve (12) is connected to the distribution valve (3) to supply air to other air-using units of the vehicle; two one-way valves are provided between the first air inlet 21 and the second air inlet 22 of the four-circuit protection valve (12), so that the front circuit service brake cylinder (10) and the rear circuit service brake cylinder (9) can supply air to the parking brake cylinder (11) and the distribution valve (3), while the front circuit service brake cylinder (10) and the rear circuit service brake cylinder (9) are not ventilated; a one-way valve is provided between the third air inlet 23 and the first air inlet 21 of the four-circuit protection valve (12), so that the parking brake cylinder (11) can supply air to the rear circuit service brake cylinder (9), that is, to charge the front circuit service brake cylinder (10);

[0008] A disconnect switch (5) and an air brake connector (6) are respectively installed on the underside of the bumper bracket and the rear crossbeam. The disconnect switch (5) is used to control the opening and closing of the air circuit. The disconnect switch (5) on the bumper is connected to the front circuit service brake air cylinder (10) for air intake of the air cylinder when being towed. The disconnect switch (5) on the rear crossbeam is connected to the distribution valve (3) for providing air source to the towed vehicle.

[0009] This invention adds a roadside air supply line to the original brake air circuit, which improves the ability of heavy trucks to get out of trouble on the road, reduces the cost of roadside assistance when heavy trucks break down, reduces the time of roadside assistance, effectively alleviates traffic congestion caused by vehicle failure, has a simple structure and low cost, and is easy to retrofit for old vehicles. Attached Figure Description

[0010] Figure 1 This is a schematic diagram of the present invention;

[0011] Figure 2 This is a schematic diagram of a four-circuit protection valve. Detailed Implementation

[0012] This utility model adds an air supply line for roadside assistance to the original braking system, as shown in the diagram. Figure 1As shown. The air braking system is a multi-circuit braking system, which uses a four-circuit protection valve (12) to distribute and protect the pressure of each circuit. The principle of the four-circuit protection valve (12) is as follows. Figure 2 As shown.

[0013] The compressed air generated by the air compressor is cooled by the compressed air pipe (1) and the frame pipe (2), and after being dried by the dryer (8), it is connected to port 1 of the four-circuit protection valve (12) to supply air to the four-circuit protection valve (12); the first air inlet 21 is connected to the rear circuit service brake cylinder (9), and supplies air to the rear axle service brake chamber through the service relay valve (4) to perform service braking; the second air inlet 22 is connected to the front circuit service brake cylinder (10), and supplies air to the front axle service brake chamber to perform service braking; the third air inlet 23 is connected to the parking brake cylinder (11), and supplies air to the parking brake chamber through the parking relay valve (7) to release the parking brake; the fourth air inlet 24 is connected to the distribution valve (3) to supply air to other air-using units of the vehicle. There are two one-way valves between the first air inlet 21 and the second air inlet 22. The front circuit service brake cylinder (10) and the rear circuit service brake cylinder (9) can supply air to the parking brake cylinder (11) and the distribution valve (3). The front circuit service brake cylinder (10) and the rear circuit service brake cylinder (9) are not connected to the air supply. There is a one-way valve between the third air inlet 23 and the first air inlet 21. The parking brake cylinder (11) can supply air to the rear circuit service brake cylinder (9). That is, filling the front circuit service brake cylinder (10) can provide an air source for the whole vehicle.

[0014] This utility model adds a disconnect switch (5) and an air brake connector (6) to the underside of the bumper bracket and the rear crossbeam. During rescue, the spiral tube in the vehicle tool is used to connect the air brake connectors (6) of the front and rear vehicles. The disconnect switch (5) is used to control the opening and closing of the air circuit. The disconnect switch (5) of the bumper is connected to the front circuit service brake cylinder (10) for air intake of the cylinder when being towed. The disconnect switch (5) of the rear crossbeam is connected to the distribution valve (3) for providing air source to the towed vehicle.

Claims

1. A pneumatic braking system for escaping road entrapment in heavy-duty trucks, characterized in that: Includes compressed air pipe (1), frame pipe (2), distribution valve (3), travel relay valve (4), disconnect switch (5), air brake connector (6), parking relay valve (7), dryer (8), rear circuit travel brake cylinder (9), front circuit travel brake cylinder (10), parking brake cylinder (11) and four-circuit protection valve (12); Compressed air is cooled by compressed air pipe (1) and frame pipe (2), and after being dried by dryer (8), it is connected to the air inlet 1 of four-circuit protection valve (12) to supply air to four-circuit protection valve (12); the first air inlet 21 of four-circuit protection valve (12) is connected to the rear circuit service brake cylinder (9), and supplies air to the rear axle service brake chamber via service relay valve (4) to perform service braking; the second air inlet 22 of four-circuit protection valve (12) is connected to the front circuit service brake cylinder (9). 10) Connect to supply air to the front axle service brake chamber for service braking; the third air inlet 23 of the four-circuit protection valve (12) is connected to the parking brake cylinder (11), and supplies air to the parking brake chamber via the parking relay valve (7) to release the parking brake; the fourth air inlet 24 of the four-circuit protection valve (12) is connected to the distribution valve (3) to supply air to the vehicle's air supply units excluding the rear axle service brake chamber, the front axle service brake chamber, and the parking brake chamber; the four-circuit protection valve ( Two one-way valves are provided between the first air inlet 21 and the second air inlet 22 of the four-circuit protection valve (12). The front circuit service brake cylinder (10) and the rear circuit service brake cylinder (9) can supply air to the parking brake cylinder (11) and the distribution valve (3). The front circuit service brake cylinder (10) and the rear circuit service brake cylinder (9) are not ventilated. A one-way valve is provided between the third air inlet 23 and the first air inlet 21 of the four-circuit protection valve (12). The parking brake cylinder (11) can supply air to the parking brake cylinder (11) and the distribution valve (3). The rear circuit service brake cylinder (9) supplies air, that is, it fills the front circuit service brake cylinder (10); the bumper bracket and the rear crossbeam are respectively equipped with a disconnect switch (5) and an air brake connector (6). The disconnect switch (5) is used to control the opening and closing of the air circuit; the disconnect switch (5) on the bumper is connected to the front circuit service brake cylinder (10) for air intake when being towed; the disconnect switch (5) on the rear crossbeam is connected to the distribution valve (3) for providing air source to the towed vehicle.

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