Air brake system for dump truck

Abstract

The utility model relates to the technical field of mining dump trucks, in particular to an air braking system for a dump truck, which comprises an air compressor, one end of the air compressor is connected with an electric control air dryer, and one end of the electric control air dryer is connected with a four-loop protection valve. The four-loop protection valve is connected with a first gas storage cylinder, a second gas storage cylinder, a third gas storage cylinder, a fourth gas storage cylinder and an auxiliary gas storage cylinder, one end of the third gas storage cylinder is connected with the fourth gas storage cylinder and is connected with a third four-axle driving relay valve, and the other end of the third gas storage cylinder is connected with a brake main valve; one end of the first air cylinder is connected with the second air cylinder, the second air cylinder is connected with the first two-axle traveling relay valve, the brake master valve is connected with the second air cylinder, and one end of the brake master valve is connected with the first two-axle traveling relay valve and the third four-axle traveling relay valve. And the effect of four-axle service braking and parking braking of the dumper can be achieved.

Description

Technical Field

[0001] This utility model relates to the field of mining dump truck technology, specifically to a pneumatic braking system for dump trucks. Background Technology

[0002] Heavy-duty mining dump trucks are off-highway dump trucks with advantages such as high load capacity and high working efficiency, and are widely used in large-scale open-pit mining and earthwork construction projects. The braking system is a crucial component of mining dump trucks, having a vital impact on the vehicle's safety and reliability, and is related to the safety of life and property.

[0003] Currently, heavy-duty mining dump trucks generally use air pressure braking systems. Compressed air is supplied by an air compressor to power the air braking system. An air dryer dries and filters the compressed air, an air tank stores the air, and the flow of compressed air is controlled by the master brake valve to brake the vehicle.

[0004] However, due to limitations in the performance of air compressors, various valve components, and system matching issues, existing heavy-duty mining dump truck pneumatic braking systems suffer from problems such as low air pressure, small air tank volume, and the system only acting on the rear wheels when parked. This results in low braking torque, poor stability, and low safety, failing to meet the requirements of vehicles operating in open-pit mines with slippery roads, numerous curves, and steep slopes.

[0005] Therefore, it is necessary to provide a new type of pneumatic braking system for dump trucks. Utility Model Content

[0006] In view of the technical problems existing in the prior art, the present invention provides a pneumatic braking system for dump trucks.

[0007] The technical solution adopted by this utility model to solve its technical problem is as follows: A pneumatic braking system for dump trucks is provided, including an air compressor. One end of the air compressor is connected to an electronically controlled air dryer. One end of the electronically controlled air dryer is connected to a four-circuit protection valve. The four-circuit protection valve is connected to a first air reservoir, a second air reservoir, a third air reservoir, a fourth air reservoir, and an auxiliary air reservoir. One end of the third air reservoir is connected to the fourth air reservoir. A third and fourth axle travel relay valve is connected to the fourth air reservoir. The other end of the third air reservoir is connected to a master brake valve. One end of the first air reservoir is connected to the second air reservoir. The second air reservoir is connected to a first and second axle travel relay valve. The master brake valve is connected to the second air reservoir. One end of the master brake valve is connected to the first and second axle travel relay valves and the third and fourth axle travel relay valves respectively. The first and second axle travel relay valves are connected to the first and second axle composite air chambers and the second axle composite air chamber. The third and fourth axle travel relay valves are connected to the third and fourth axle composite brake chambers.

[0008] One end of the auxiliary air storage cylinder is connected to a handbrake valve. One end of the handbrake valve is connected to the first and second axle parking relay valves and the third and fourth axle parking relay valves. One end of the first and second axle parking relay valves is connected to the first axle composite air chamber and the second axle composite air chamber. One end of the third and fourth axle parking relay valves is connected to the third axle composite brake air chamber and the fourth axle composite brake air chamber.

[0009] Furthermore, the air compressor outlet is connected to the air inlet of the electronically controlled air dryer, and the air outlet of the electronically controlled air dryer is connected to the air inlet of the four-circuit protection valve.

[0010] Furthermore, the outlet of the four-circuit protection valve is connected to the first air reservoir, the second air reservoir, the third air reservoir, the fourth air reservoir, and the auxiliary air reservoir; the first air reservoir, the second air reservoir, the third air reservoir, and the fourth air reservoir are respectively connected to the air inlet of the brake master valve.

[0011] Furthermore, the air outlet of the brake master valve is connected to the control ports of the first and second axle travel relay valves and the third and fourth axle travel relay valves, respectively.

[0012] Furthermore, the air outlets of the first and second axle travel relay valves and the third and fourth axle travel relay valves are respectively connected to the travel chambers of the first axle composite air chamber, the second axle composite air chamber, the third axle composite brake air chamber, and the fourth axle composite brake air chamber.

[0013] Furthermore, the outlet of the four-circuit protection valve is used to supply gas to the first gas storage cylinder, the second gas storage cylinder, the third gas storage cylinder, the fourth gas storage cylinder, and the auxiliary gas storage cylinder.

[0014] Furthermore, the auxiliary air storage cylinder supplies air to the handbrake valve.

[0015] Furthermore, a diverter valve block is connected to the outlet of the parking and auxiliary gas storage tank.

[0016] Furthermore, the diversion valve block is respectively connected to an air horn, a solenoid valve block, and a third and fourth axle parking relay valve.

[0017] The beneficial effects of this utility model are as follows: 1. By setting up the first and second air storage cylinders, the compressed air from one path supplies air to the brake master valve, and the other path supplies air to the first and second axle travel relay valves; the compressed air from the third and fourth air storage cylinders supplies air to the brake master valve. The compressed air from the first and second air storage cylinders flows to the first and second axle composite brake chambers via the first and second axle travel relay valves, and the compressed air from the third and fourth air storage cylinders flows to the third and fourth axle composite brake chambers via the third and fourth axle travel relay valves, thereby achieving the effect of four-axle travel braking for the dump truck.

[0018] 2. By setting the air outlet of the handbrake valve and the control port of the first and second axle parking relay valves and the third and fourth axle parking relay valves, the compressed air in the pipeline is discharged through the exhaust port of the handbrake valve. The compressed air between the first and second axle parking relay valves and the first axle compound brake chamber, the second axle compound brake chamber, the third axle compound brake chamber, and the fourth axle compound brake chamber is discharged through the exhaust port of the first and second axle parking relay valves and the third and fourth axle parking relay valves, the parking brake effect of the dump truck is achieved. Attached Figure Description

[0019] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0020] Figure 1 This is a schematic diagram of the structure of a pneumatic braking system for dump trucks provided by this utility model;

[0021] The component names and their numbers in the diagram are as follows:

[0022] 1. Air compressor; 2. Electrically controlled air dryer; 3. Four-circuit protection valve; 4. Third air reservoir; 5. Fourth air reservoir; 6. First air reservoir; 7. Second air reservoir; 8. Auxiliary air reservoir; 9. Master brake valve; 10. First and second axle travel relay valves; 11. Third and fourth axle travel relay valves; 12. First axle compound brake chamber; 13. Second axle compound brake chamber; 14. Third axle compound brake chamber; 15. Fourth axle compound brake chamber; 16. Handbrake valve; 17. First and second axle parking relay valves; 18. Third and fourth axle parking relay valves; 19. Diverter valve block; 20. Solenoid valve assembly; 21. Differential lock cylinder; 22. Air horn. Detailed Implementation

[0023] To make the technical problem to be solved, the technical solution, and the beneficial effects of this utility model clearer, the present utility model will now be described in detail with reference to the accompanying drawings. This drawing is a simplified schematic diagram, illustrating only the basic aspects of the present utility model, and therefore only shows the components relevant to the present utility model. Obviously, the described embodiments are only some, not all, of the embodiments of this utility model. All other embodiments obtained by those skilled in the art based on the embodiments of this utility model without creative effort are within the scope of protection of this utility model.

[0024] Example 1,

[0025] like Figure 1As shown, this embodiment provides a pneumatic braking system for dump trucks, including an air compressor 1. One end of the air compressor 1 is connected to an electronically controlled air dryer 2, and the other end of the electronically controlled air dryer 2 is connected to a four-circuit protection valve 3. The air outlet of the air compressor 1 is connected to the air inlet of the electronically controlled air dryer 2, and the air outlet of the electronically controlled air dryer 2 is connected to the air inlet of the four-circuit protection valve 3. The air compressor 1 is connected to the air inlet of the air dryer after heat dissipation through a steel pipe to supply air to the system. After being dried and filtered by the air dryer, the compressed air flows to the air inlet of the four-circuit protection valve 3 and is supplied to each air storage tank through the air outlet of the four-circuit protection valve 3.

[0026] The four-circuit protection valve 3 is connected to a first air reservoir 6, a second air reservoir 7, a third air reservoir 4, a fourth air reservoir 5, and an auxiliary air reservoir 8. The outlet of the four-circuit protection valve 3 is connected to the first air reservoir 6, the second air reservoir 7, the third air reservoir 4, the fourth air reservoir 5, and the auxiliary air reservoir 8. The first air reservoir 6, the second air reservoir 7, the third air reservoir 4, and the fourth air reservoir 5 are respectively connected to the air inlet of the brake master valve 9. The outlet of the four-circuit protection valve 3 is used to supply air to the first air reservoir 6, the second air reservoir 7, the third air reservoir 4, the fourth air reservoir 5, and the auxiliary air reservoir 8. The outlet of the brake master valve 9 is respectively connected to the first air reservoir 6, the second air reservoir 7, the third air reservoir 4, the fourth air reservoir 5, and the auxiliary air reservoir 8. The control ports of the second axle travel relay valve 10 and the third and fourth axle travel relay valves 11 are connected. The compressed air from the first air reservoir 6 and the second air reservoir 7 is supplied to the brake master valve 9 on one side, and the compressed air from the third air reservoir 4 and the fourth air reservoir 5 is supplied to the brake master valve 9 on the other side. The first air reservoir 6 and the second air reservoir 7 form the first and second axle air reservoirs, and the third air reservoir 4 and the fourth air reservoir 5 form the third and fourth axle air reservoirs. Therefore, the first and second axle air reservoirs supply air to the brake master valve 9, and the other air reservoir supplies air to the first and second axle travel relay valve 10; the third and fourth axle air reservoirs supply air to the brake master valve 9, and the other air reservoir supplies air to the third and fourth axle travel relay valve 11.

[0027] One end of the third air reservoir 4 is connected to the fourth air reservoir 5 and is connected to the third and fourth axle travel relay valve 11. The other end of the third air reservoir 4 is connected to the brake master valve 9. One end of the first air reservoir 6 is connected to the second air reservoir 7. The second air reservoir 7 is connected to the first and second axle travel relay valve 10. The brake master valve 9 is connected to the second air reservoir 7. One end of the brake master valve 9 is connected to the first and second axle travel relay valve 10 and the third and fourth axle travel relay valve 11 respectively. The first and second axle travel relay valve 10 is connected to the first axle composite air chamber and the second axle composite air chamber. The third and fourth axle travel relay valve 11 is connected to the third axle composite brake air chamber 14 and the fourth axle composite brake air chamber 15.

[0028] When the driver presses the brake pedal, compressed air flows through the outlet of the brake master valve 9 to the control ports of the first and second axle service relay valves 10 and the third and fourth axle service relay valves 11. Compressed air from the first air reservoir 6 and the second air reservoir 7 flows through the first and second axle service relay valves 10 to the first axle composite brake chamber 12 and the second axle composite brake chamber 13. Compressed air from the third air reservoir 4 and the fourth air reservoir 5 flows through the third and fourth axle service relay valves 11 to the third axle composite brake chamber 14 and the fourth axle composite brake chamber 15, thereby enabling service braking of all four axles.

[0029] One end of the auxiliary air storage cylinder 8 is connected to a handbrake valve 16. One end of the handbrake valve 16 is connected to the first and second axle parking relay valves 17 and the third and fourth axle parking relay valves 18. One end of the first and second axle parking relay valves 17 is connected to the first axle composite air chamber and the second axle composite air chamber. One end of the third and fourth axle parking relay valves 18 is connected to the third axle composite brake air chamber 14 and the fourth axle composite brake air chamber 15. The air outlets of the first and second axle driving relay valves 10 and the third and fourth axle driving relay valves 11 are connected to the driving chambers of the first axle composite air chamber, the second axle composite air chamber, the third axle composite brake air chamber 14, and the fourth axle composite brake air chamber 15, respectively.

[0030] Compressed air from the auxiliary air reservoir 8 is supplied to the handbrake valve 16 on one side and to the first and second axle parking relay valves 17 and the third and fourth axle parking relay valves 18 on the other. When the driver pulls the lever, the compressed air flows through the outlet of the handbrake valve 16 to the control port of the first and second axle parking relay valves 17 and the third and fourth axle parking relay valves 18. The compressed air in the auxiliary air reservoir 8 flows through the outlets of the first and second axle parking relay valves 17 and the third and fourth axle parking relay valves 18 to the parking ports of the first axle compound brake chamber 12, the second axle compound brake chamber 13, the third axle compound brake chamber 14, and the fourth axle compound brake chamber 15, thereby releasing the parking brake.

[0031] The outlet of the parking and auxiliary air storage tank 8 is connected to a diversion valve block 19, and the diversion valve block 19 is connected to an air horn 22, a solenoid valve block and a third and fourth axle parking relay valve 18 respectively; the solenoid valve assembly 20 is connected to a differential lock cylinder 21.

[0032] The compressed air from the auxiliary air storage tank 8 flows to the air inlet of the diverter valve block 19. The compressed air controls the differential lock cylinder 21 through the air outlet of the solenoid valve assembly 20. At the same time, another path of compressed air from the air outlet of the diverter valve block 19 flows to the air horn 22, which provides a warning.

[0033] By setting up a system where compressed air from the first air reservoir 6 and the second air reservoir 7 is supplied to the brake master valve 9, the compressed air from the first air reservoir 6 and the second air reservoir 7 flows through the first and second axle travel relay valves 10 to the first axle composite brake chamber 12 and the second axle composite brake chamber 13, and the compressed air from the third air reservoir 4 and the fourth air reservoir 5 flows through the third and fourth axle travel relay valves 11 to the third axle composite brake chamber 14 and the fourth axle composite brake chamber 15, thus achieving the effect of four-axle travel braking for the dump truck.

[0034] When the driver pulls down the handle, compressed air in the pipeline between the air outlet of the handbrake valve 16 and the control ports of the first and second axle parking relay valves 17 and the third and fourth axle parking relay valves 18 is discharged through the exhaust port of the handbrake valve 16. Compressed air between the first and second axle parking relay valves 17 and the third and fourth axle parking relay valves 18 and the first axle compound brake chamber, the second axle compound brake chamber, the third axle compound brake chamber, and the fourth axle compound brake chamber is discharged through the exhaust ports of the first and second axle parking relay valves 17 and the third and fourth axle parking relay valves 18, thus achieving the effect of parking brake on the dump truck; and the parking brake system acts on all wheels.

[0035] In Example 2, a two-stage drying and filtration device is used in the compressed air drying and filtration stage. Compared with the single drying and filtration function of the electronically controlled air dryer in the first example, the two-stage drying and filtration device in this example first performs preliminary coarse filtration on the air to remove larger particulate impurities and some moisture, and then performs fine drying treatment. This results in higher cleanliness and lower moisture content of the compressed air output to the four-circuit protection valve, effectively reducing the failure rate of subsequent air circuit components caused by impurities and moisture, further improving the reliability and stability of the entire braking system, and ensuring the safety of the braking process.

[0036] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0037] It should be understood that the terms "length", "width", "up", "down", "front and back", "left and right", "vertical", "horizontal", "top", "bottom", "inner", and "outer" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0038] Based on the preferred embodiments of this utility model described above, those skilled in the art can make various changes and modifications without departing from the scope of this utility model. The technical scope of this utility model is not limited to the contents of the specification, but must be determined according to the scope of the claims.

Claims

1. A pneumatic braking system for a dump truck, characterized by: The utility model provides an air compressor, one end of the air compressor is connected with an electric control air dryer, one end of the electric control air dryer is connected with a four circuit protection valve, the four circuit protection valve is connected with a first air cylinder, a second air cylinder, a third air cylinder, a fourth air cylinder, an auxiliary air cylinder, one end of the third air cylinder is connected with the fourth air cylinder, the fourth air cylinder is connected with a third fourth bridge operating valve, the other end of the third air cylinder is connected with a brake master valve, one end of the first air cylinder is connected with the second air cylinder, the second air cylinder is connected with a first second bridge operating valve, the brake master valve is connected with the second air cylinder, one end of the brake master valve is connected with the first second bridge operating valve and the third fourth bridge operating valve respectively, the first second bridge operating valve is connected with a first bridge composite air chamber and a second bridge composite air chamber, the third fourth bridge operating valve is connected with a third bridge composite brake air chamber and a fourth bridge composite brake air chamber. One end of the auxiliary air cylinder is connected with a hand brake valve, one end of the hand brake valve is connected with a first second bridge parking valve and a third fourth bridge parking valve respectively, one end of the first second bridge parking valve is connected with the first bridge composite air chamber and the second bridge composite air chamber, one end of the third fourth bridge parking valve is connected with the third bridge composite brake air chamber and the fourth bridge composite brake air chamber.

2. A pneumatic braking system for a dump truck as defined in claim 1, characterized in that: The air outlet of the air compressor is connected with the air inlet of the electric control air dryer, and the air outlet of the electric control air dryer is connected with the air inlet of the four circuit protection valve.

3. The pneumatic braking system for a dump truck according to claim 1, characterized in that: The air outlets of the four circuit protection valve are connected with the first air cylinder, the second air cylinder, the third air cylinder, the fourth air cylinder and the auxiliary air cylinder, and the first air cylinder, the second air cylinder, the third air cylinder and the fourth air cylinder are connected with the air inlets of the brake master valve respectively.

4. The pneumatic braking system for a dump truck according to claim 1, characterized in that: The air outlets of the brake master valve are connected with the control ports of the first second bridge operating valve and the third fourth bridge operating valve respectively.

5. The pneumatic braking system for a dump truck according to claim 1, characterized by: The air outlets of the first second bridge operating valve and the third fourth bridge operating valve are connected with the operating cavities of the first bridge composite air chamber, the second bridge composite air chamber, the third bridge composite brake air chamber and the fourth bridge composite brake air chamber respectively.

6. The pneumatic braking system for a dump truck according to claim 2, characterized by: The air outlets of the four circuit protection valve are used for supplying air to the first air cylinder, the second air cylinder, the third air cylinder, the fourth air cylinder and the auxiliary air cylinder.

7. A pneumatic braking system for a dump truck as defined in claim 6, characterized in that: The auxiliary air cylinder supplies air to the hand brake valve.

8. A pneumatic braking system for a dump truck as defined in claim 6, wherein: The air outlets of the parking air cylinder and the auxiliary air cylinder are connected with a flow dividing valve block.

9. A pneumatic braking system for a dump truck as defined in claim 8, characterized in that: The flow dividing valve block is connected with an air horn, an electromagnetic valve block and the third fourth bridge parking valve respectively.

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