Engineering machinery vehicle braking circulation cooling system and cooling method thereof

Abstract

The invention belongs to a mechanical vehicle braking circulation cooling system in the technical field of engineering vehicle braking, and further relates to a mechanical vehicle braking circulation cooling method. An air outlet of an air storage cylinder (1) is communicated with an air brake valve (2), an air outlet of the air brake valve (2) is respectively communicated with an air inlet of an oil injection air booster pump (3) and an oil pumping air booster pump (4), an oil inlet of the oil injection air booster pump (3) is communicated with an oil outlet of a liquid storage tank (6), an oil outlet of the oil injection air booster pump (3) is communicated with a brake wheel cylinder (7), and an oil pumping opening of the oil pumping air booster pump (4) is communicated with the brake wheel cylinder (7). An oil return opening of the oil pumping air booster pump (4) is communicated with an oil inlet of the heat dissipation dehydrator (5), and an oil outlet of the heat dissipation dehydrator (5) is communicated with an oil inlet of the liquid storage tank (6). According to the mechanical vehicle brake circulation cooling system, the temperature of brake fluid is effectively reduced to the normal temperature, circulation, cooling and water removal of the high-temperature brake fluid are achieved, and vehicle driving safety is guaranteed.

Description

Technical Field

[0001] The present invention belongs to the technical field of engineering vehicle brakes, and more specifically, relates to an engineering vehicle brake circulation cooling system. The present invention also relates to an engineering vehicle brake circulation cooling method. Background Art

[0002] During the driving process of a vehicle, under certain specific conditions (such as long downhill, hot weather, and on-site operations), due to long-term, high-speed and frequent braking, the friction lining and the brake disc or brake drum will heat up rapidly due to friction, and the temperature is often above 300°C, and can even reach a high temperature of 600°C to 700°C in an instant, and then the "brake thermal decay" phenomenon will occur: the brake friction coefficient will drop significantly; the braking torque will drop significantly; the vehicle braking distance will increase significantly, which is easy to cause brake failure and even vehicle fire, and has become a major hidden danger affecting property safety and production safety. The "brake thermal decay" phenomenon is more likely to occur on engineering vehicles. Since engineering vehicles generally travel back and forth on the site, the working environment is harsh, the braking torque is large, the braking action is frequent, and they are in a high-intensity working state of "stopping for people but not stopping" for a long time, the "thermal decay" phenomenon often occurs and is extremely difficult to avoid. When "brake thermal decay" occurs, high temperature heat is usually concentrated in two parts of the brake system: one is the brake friction lining and the wheel hub brake disc or brake drum, that is, the brake; the other is transferred from the brake to the brake fluid in the hydraulic pipeline through heat conduction. The high temperature in the brake pipeline will reduce the viscosity of the brake fluid, and because the brake fluid needs to be ventilated in the reservoir, it will continuously absorb moisture in the air, and will produce high-temperature vapor mixed with water and oil, thereby damaging the rubber seals in various parts of the brake system, causing oil boiling, leakage, and other phenomena that cause brake fluid loss. In turn, the loss of brake fluid in the pipeline will lead to major faults such as longer vehicle braking distance, weak braking, and even brake failure, which seriously threatens the driving safety of the vehicle. The solution for the existing brake system is usually to use brake fluid with a higher boiling point, good high temperature resistance, and poor water absorption, but it cannot eliminate the problem of brake fluid absorbing water, and high-temperature brake fluid will still damage rubber seals in various parts of the system, so it cannot effectively solve the negative impact of high braking temperature.

[0003] In the prior art, there is a technology named "vehicle brake system" and published as "CN118284548A", which comprises: a hydraulic control unit (6) for controlling the braking force generated in a vehicle (1); a first master chamber (first master cylinder (21a)) which is connected to at least a wheel cylinder (24) of a front wheel (2) of the vehicle (1) and is a master chamber for the front wheel (2); and a second master chamber (second master cylinder (21b)) which is connected to at least a wheel cylinder (26) of a rear wheel (3) of the vehicle (1) and is a master chamber for the rear wheel (3); the hydraulic control unit (6) controls the braking force generated in one of the front wheels (2) and the rear wheels (3); the first master chamber and the second master chamber are connected to the hydraulic control unit (6); and in the first master chamber and the second master chamber, the master chamber for the other wheel of the front wheel (2) and the rear wheel (3) is connected to the wheel cylinder of the other wheel without passing through the hydraulic control unit (6).

[0004] However, this technology does not involve the technical problems and technical solutions of the present application. Summary of the invention

[0005] The technical problem to be solved by the present invention is: in view of the deficiencies in the prior art, a brake circulation cooling system for an engineering machinery vehicle is provided, which has a simple structure and can effectively reduce the temperature of the brake fluid to room temperature, realize the circulation, cooling and dehydration of the high-temperature brake fluid, and ensure the driving safety of the vehicle.

[0006] To solve the above-mentioned technical problems, the technical solution adopted by the present invention is: The present invention relates to a brake circulation cooling system for engineering machinery vehicles, wherein an air inlet of an air reservoir is connected to an air source, an air outlet of the air reservoir is connected to an air brake valve, an air outlet of the air brake valve is respectively connected to an air inlet of an oil-injecting air booster pump and an air inlet of an oil-extracting air booster pump, an oil inlet of the oil-injecting air booster pump is connected to an oil outlet of a liquid storage tank, an oil outlet of the oil-injecting air booster pump is connected to a brake wheel cylinder, an oil extraction port of the oil-extracting air booster pump is connected to a brake wheel cylinder, an oil return port of the oil-extracting air booster pump is connected to an oil inlet of a heat sink dehydrator, and an oil outlet of the heat sink dehydrator is connected to an oil inlet of a liquid storage tank.

[0007] The air outlet of the air storage cylinder is connected to the air brake valve through the first pipeline, the air brake valve is connected to one end of the second pipeline, the other end of the second pipeline is connected to the oil injection air booster pump through the first branch pipe, and the other end of the second pipeline is connected to the oil extraction air booster pump through the second branch pipe.

[0008] The oil inlet of the oil-injection air booster pump is connected to the oil outlet of the liquid storage tank through the third pipeline, and the oil outlet of the liquid storage tank is connected to the brake wheel cylinder through the fourth pipeline.

[0009] The oil extraction port of the oil extraction air booster pump is connected to the brake wheel cylinder through the fifth pipeline, the oil return port of the oil extraction air booster pump is connected to the oil inlet of the heat dissipation and dehydration device through the sixth pipeline, and the oil outlet of the heat dissipation and dehydration device is connected to the oil inlet of the liquid storage tank through the seventh pipeline.

[0010] When the mechanical vehicle starts, the air source supplies air to the air reservoir until the braking pressure is reached; when the mechanical vehicle brakes, the driver steps on the air brake valve pedal, and the compressed air in the air reservoir enters through the air brake valve outlet from the air inlet of the oil-injecting air booster pump and the air inlet of the oil-extracting air booster pump respectively, and the pistons of the oil-injecting air booster pump and the oil-extracting air booster pump move forward respectively, and the oil-injecting air booster pump and the oil-extracting air booster pump generate hydraulic pressure, which is injected into the brake wheel cylinder to generate braking force, thereby slowing down and braking the mechanical vehicle.

[0011] When the mechanical vehicle releases the brakes and the driver releases the air brake valve pedal, the gas in the oil-filling air booster pump and the oil-extracting air booster pump is discharged to the atmosphere through the air brake valve respectively, and the pistons of the oil-filling air booster pump and the oil-extracting air booster pump return to their respective positions under the action of their respective springs, and the high-temperature brake fluid in the brake wheel cylinder 7 is pumped into the return oil to the heat sink and dehydrator through the oil-extracting air booster pump, and then flows back to the liquid storage tank for storage after being cooled in the heat sink and dehydrator, completing a cycle of cooling.

[0012] The heat dissipation and water removal device is provided with a hydrophilic fiber net and a molecular sieve.

[0013] The oil-injected air booster pump comprises a housing, a piston is arranged in the housing, and a return spring is arranged on one side of the piston close to the air outlet of the air booster pump.

[0014] The oil extraction air booster pump comprises a shell, a piston is arranged in the shell, and a return spring is arranged on the side of the piston close to the air outlet of the air booster pump.

[0015] The present invention also relates to a brake circulation cooling method for an engineering machinery vehicle, which has simple steps, effectively reduces the temperature of the brake fluid to room temperature, realizes the circulation, cooling and water removal of the high-temperature brake fluid, and ensures the driving safety of the vehicle. The cooling steps of the brake circulation cooling method for an engineering machinery vehicle are: S1. When the mechanical vehicle starts, the air source supplies air to the air reservoir until the brake pressure is reached; when the mechanical vehicle brakes, the driver steps on the air brake valve pedal, and the compressed air in the air reservoir enters from the air inlet of the oil-injection air booster pump and the air inlet of the oil-extraction air booster pump through the air outlet of the air brake valve, and the pistons of the oil-injection air booster pump and the oil-extraction air booster pump move forward respectively, and the oil-injection air booster pump and the oil-extraction air booster pump generate hydraulic pressure, which is injected into the brake wheel cylinder to generate braking force, so that the mechanical vehicle slows down and brakes; S2. When the mechanical vehicle releases the brakes and the driver releases the air brake valve pedal, the gas in the oil-filling air booster pump and the oil-extracting air booster pump is discharged to the atmosphere through the air brake valve respectively, and the pistons of the oil-filling air booster pump and the oil-extracting air booster pump return to their respective positions under the action of their respective springs. The high-temperature brake fluid in the brake wheel cylinder is pumped into the return oil to the heat sink and dehydrator through the oil-extracting air booster pump, and then flows back to the liquid storage tank for storage after being cooled in the heat sink and dehydrator, completing a cycle of cooling.

[0016] The technical solution of the present invention is adopted, and the working principle and beneficial effects are as follows: The brake circulation cooling system for engineering machinery vehicles described in the present invention is provided with an air reservoir when the structure is set up. The air reservoir is used to store air. The air inlet of the air reservoir is connected to an air source. The air source is used to supply air to the air reservoir. The air outlet of the air reservoir is connected to an air brake valve. The air brake valve is used to control the on-off of air. The air outlet of the air brake valve is respectively connected to the air inlet of an oil-injection air booster pump and the oil-extraction air booster pump. Air is fed into the oil-injection air booster pump and the oil-extraction air booster pump. The oil inlet of the oil-injection air booster pump is connected to the oil outlet of a liquid storage tank. The fluid storage tank is used to store brake fluid (brake oil), and can supply brake fluid to the brake wheel cylinder through an oil-filling air booster pump. The oil outlet of the fluid storage tank is connected to the oil-filling air booster pump, and the oil suction port of the oil-pumping air booster pump is connected to the brake wheel cylinder. The oil return port of the oil-pumping air booster pump is connected to the oil inlet of the heat dissipation and dehydration device. The oil-pumping air booster pump is also used to pump back the air of the brake wheel cylinder, thereby pumping the brake fluid in the brake wheel cylinder into the heat dissipation and dehydration device for brake fluid cooling, and then the brake fluid flows back to the oil inlet of the fluid storage tank. The working principle of the cooling system of the present invention is: when the driver steps on the air brake valve pedal, compressed air enters the oil-injection air booster pump and the oil-extraction air booster pump from the air reservoir through the air brake valve along the pipeline at the same time, and at the same time pushes the pistons of the two booster pumps forward. The forward movement of the piston compresses the brake fluid, so that liquid pressure is generated in the pipeline. At this time, the piston of the oil-extraction air booster pump moves forward to send in air and then blocks the oil extraction port of the oil-extraction air booster pump, so that the brake fluid cannot enter the oil-extraction air booster pump. The high-pressure brake fluid enters the two brake wheel cylinders of the front axle of the vehicle along the pipeline at the same time, pushes the piston of the brake wheel cylinder 7 to move, generates braking force, causes the friction lining to rub against the brake disc (or brake drum), and slows down and brakes the vehicle. When the driver releases the air brake valve pedal, the compressed air is discharged from the oil-filled air booster pump and the oil-extracted air booster pump to the atmosphere through the pipeline from the air brake valve exhaust port, and the system is depressurized. The pistons of the oil-filled air booster pump and the oil-extracted air booster pump return to their original positions under the action of the return spring, driving the pistons to return to their original positions. The high-temperature brake fluid generated by friction in the brake wheel cylinder 7 flows back along the pipeline. Because the oil-filled air booster pump has a one-way valve that blocks the passage into the oil-filled air booster pump, and the piston return of the oil-extracted air booster pump generates suction, the high-temperature brake fluid is drawn into the heat dissipation and dehydration device along the pipeline for cooling, and the cooled brake fluid flows back to the fluid storage tank. In this way, a brake fluid cycle is completed. The cooled brake fluid can be used for the brake fluid supply for the next braking. In this process, the high-temperature brake fluid dissipates heat and absorbs water through the pipeline and the heat dissipation and dehydration device, and then flows back to the storage tank that stores a large amount of normal-temperature brake fluid. The brake fluid will quickly drop to room temperature, which is much lower than the boiling point of the brake fluid (generally 203°C), thus preventing the occurrence of brake fluid boiling and overflow, ensuring the safety of the brake system, and further ensuring the braking safety of the entire vehicle. The system of the present invention, 1. By making the oil injection air booster pump and the oil extraction air booster pump operate at the same time, the overheated brake fluid can be pumped into the circulating cooling pipeline when the brake fluid returns, preventing the high temperature of the brake fluid from damaging the brake pipeline and the air booster pump.2. By letting the high-temperature return brake fluid flow through the heat dissipator, the high temperature is initially dissipated and the water in it is absorbed. 3. By letting the return brake fluid flow into a large-volume fluid storage tank and mix with a large amount of normal-temperature brake fluid, the temperature of the brake fluid is reduced to room temperature and supplied to the oil filling air booster pump, ultimately achieving the circulation, cooling and water removal functions of the high-temperature brake fluid. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The following is a brief description of the contents and symbols in the drawings of this specification: Figure 1 It is a structural schematic diagram of the brake circulation cooling system for an engineering machinery vehicle according to the present invention; The accompanying drawings are marked as follows: 1. air cylinder; 2. air brake valve; 3. oil-injection air booster pump (oil-injection air booster pump cylinder); 4. oil-extraction air booster pump (oil-extraction air booster pump cylinder); 5. heat dissipation and water remover; 6. liquid storage tank (oil storage tank); 7. brake wheel cylinder; 8. first pipeline; 9. second pipeline; 10. first branch pipe; 11. second branch pipe; 12. third pipeline; 13. fourth pipeline; 14. fifth pipeline; 15. sixth pipeline; 16. seventh pipeline; 17. one-way valve. DETAILED DESCRIPTION

[0018] The following is a further detailed description of the specific implementation of the present invention, such as the shape, structure, mutual position and connection relationship between the various components involved, the function and working principle of each part, etc., through the description of the embodiments with reference to the accompanying drawings: As attached Figure 1As shown, the present invention is a brake circulation cooling system for engineering machinery vehicles, the air inlet of the air reservoir 1 is connected to the air source, the air outlet of the air reservoir 1 is connected to the air brake valve 2, the air outlet of the air brake valve 2 is respectively connected to the air inlet of the oil-injection air booster pump 3 and the oil-extraction air booster pump 4, the oil inlet of the oil-injection air booster pump 3 is connected to the oil outlet of the liquid storage tank 6, the oil outlet of the oil-injection air booster pump 3 is connected to the brake wheel cylinder 7, the oil extraction port of the oil-extraction air booster pump 4 is connected to the brake wheel cylinder 7, the oil return port of the oil-extraction air booster pump 4 is connected to the oil inlet of the heat dissipation dehumidifier 5, and the oil outlet of the heat dissipation dehumidifier 5 is connected to the oil inlet of the liquid storage tank 6. The above structure proposes an improved technical solution to the deficiencies in the prior art. When the structure is set, an air reservoir 1 is set, and the air reservoir 1 is used to store air. The air inlet of the air reservoir 1 is connected to the air source, and the air source is used to supply air to the air reservoir 1. The air outlet of the air reservoir 1 is connected to the air brake valve 2, and the air brake valve 2 is used to control the air on and off. The air outlet of the air brake valve 2 is respectively connected to the air inlet of the oil-injecting air booster pump 3 and the oil-extracting air booster pump 4, and the air is sent to the oil-injecting air booster pump 3 and the oil-extracting air booster pump 4. The oil inlet of the oil-injecting air booster pump 3 is connected to the oil outlet of the liquid storage tank 6, and the liquid storage tank 6 is used to store the brake oil. Liquid (brake oil), and brake fluid can be supplied to the brake wheel cylinder 7 through the oil-filled air booster pump 3. The oil outlet of the fluid storage tank 6 is connected to the oil-filled air booster pump 3. The oil suction port of the oil-pumping air booster pump 4 is connected to the brake wheel cylinder 7. The oil return port of the oil-pumping air booster pump 4 is connected to the oil inlet of the heat dissipation and dehydration device 5. The oil-pumping air booster pump 4 is also used to pump back the air of the brake wheel cylinder 7, so that the brake fluid in the brake wheel cylinder 7 is pumped into the heat dissipation and dehydration device 5 for brake fluid cooling, and then the brake fluid flows back to the oil inlet of the fluid storage tank 6. The working principle of the cooling system of the present invention is: when the driver steps on the pedal of the air brake valve 2, the compressed air enters the oil-injecting air booster pump 3 and the oil-injecting air booster pump 4 from the air reservoir 1 through the air brake valve 2 along the pipeline at the same time, and at the same time pushes the pistons of the two booster pumps forward. The forward movement of the piston compresses the brake fluid, so that liquid pressure is generated in the pipeline. At this time, the piston of the oil-injecting air booster pump 4 moves forward to send in air and the rear piston blocks the oil extraction port of the oil-injecting air booster pump 4, so that the brake fluid cannot enter the oil-injecting air booster pump 4. The high-pressure brake fluid enters the two brake wheel cylinders 7 of the front axle of the vehicle along the pipeline at the same time, pushing the piston of the brake wheel cylinder 7 to move, generating braking force, causing the friction lining to rub against the brake disc (or brake drum), thereby slowing down and braking the vehicle. When the driver releases the pedal of the air brake valve 2, the compressed air is discharged from the oil-injected air booster pump 3 and the oil-extracted air booster pump 4 to the atmosphere through the pipeline from the exhaust port of the air brake valve 2, and the system is depressurized. The pistons of the oil-injected air booster pump 3 and the oil-extracted air booster pump 4 return to their original positions under the action of the return springs, driving the pistons to return to their original positions, and the high-temperature brake fluid generated by friction in the brake wheel cylinder 7 flows back along the pipeline. Because the one-way valve 17 of the oil-injected air booster pump 3 blocks the passage into the oil-injected air booster pump 3, and the return of the piston of the oil-extracted air booster pump 4 generates suction, the high-temperature brake fluid is pumped into the heat sink 5 along the pipeline for cooling, and the cooled brake fluid flows back to the fluid storage tank 6.In this way, a brake fluid cycle is completed. The cooled brake fluid can be used for the brake fluid supply for the next brake. In this process, the high-temperature brake fluid dissipates heat and absorbs water through the pipeline and the heat dissipation and dehydration device 5, and then flows back to the storage tank 6 which stores a large amount of normal temperature brake fluid. The brake fluid will quickly drop to room temperature, which is far lower than the boiling point of the brake fluid (generally 203°C), thus preventing the occurrence of brake fluid boiling and boiling over, ensuring the safety of the brake system, and further ensuring the braking safety of the entire vehicle. The system of the present invention, 1. By making the oil filling air booster pump and the oil extraction air booster pump operate at the same time, the overheated brake fluid can be pumped into the circulating cooling pipeline during the return of the brake fluid, preventing the high temperature of the brake fluid from damaging the brake pipeline and the air booster pump. 2. By allowing the return high-temperature brake fluid to flow through the heat dissipation and dehydration device, its high temperature is initially dissipated and the water therein is sucked out. 3. By allowing the return brake fluid to flow into the large-volume fluid storage tank and mix with a large amount of normal-temperature brake fluid, the temperature of the brake fluid is reduced to room temperature and provided to the oil injection air booster pump, and finally the circulation, cooling and water removal functions of the high-temperature brake fluid are realized. The engineering machinery vehicle brake circulation cooling system of the present invention has a simple structure, effectively reduces the temperature of the brake fluid to room temperature, realizes the circulation, cooling and water removal of the high-temperature brake fluid, and ensures the driving safety of the vehicle.

[0019] The air outlet of the air reservoir 1 is connected to the air brake valve 2 through the first pipeline 8, the air brake valve 2 is connected to one end of the second pipeline 9, the other end of the second pipeline 9 is connected to the oil-injection air booster pump 3 through the first branch pipe 10, and the other end of the second pipeline 9 is connected to the oil-extraction air booster pump 4 through the second branch pipe 11. The oil inlet of the oil-injection air booster pump 3 is connected to the oil outlet of the liquid storage tank 6 through the third pipeline 12, and the oil outlet of the liquid storage tank 6 is connected to the brake wheel cylinder 7 through the fourth pipeline 13. The oil extraction port of the oil-extraction air booster pump 4 is connected to the brake wheel cylinder 7 through the fifth pipeline 14, the oil return port of the oil-extraction air booster pump 4 is connected to the oil inlet of the heat dissipation dehumidifier 5 through the sixth pipeline 15, and the oil outlet of the heat dissipation dehumidifier 5 is connected to the oil inlet of the liquid storage tank 6 through the seventh pipeline 16. The above structure realizes the reliable connection of related components through various pipelines, and the connection seal is reliable.

[0020] When the mechanical vehicle starts, the air source supplies air to the air reservoir 1 until the brake pressure is reached; when the mechanical vehicle brakes, the driver steps on the pedal of the air brake valve 2, and the compressed air in the air reservoir 1 enters from the air inlet of the oil-injection air booster pump 3 and the air inlet of the oil-extraction air booster pump 4 through the air outlet of the air brake valve 2, and the pistons of the oil-injection air booster pump 3 and the oil-extraction air booster pump 4 move forward respectively, and the oil-injection air booster pump 3 and the oil-extraction air booster pump 4 generate hydraulic pressure, which is injected into the brake wheel cylinder 7 to generate braking force, so that the mechanical vehicle slows down and brakes. The above structure can reliably achieve the braking of the mechanical vehicle by the driver stepping on the pedal of the air brake valve 2.

[0021] When the mechanical vehicle releases the brakes, when the driver releases the pedal of the air brake valve 2, the gas in the oil-filling air booster pump 3 and the oil-extracting air booster pump 4 is discharged to the atmosphere through the air brake valve 2, and the pistons of the oil-filling air booster pump 3 and the oil-extracting air booster pump 4 return to their respective positions under the action of their respective springs, and the high-temperature brake fluid in the brake wheel cylinder 7 is pumped into the return oil to the heat dissipation and dehydration device 5 by the oil-extracting air booster pump 4, and then flows back to the liquid storage tank 6 for storage after being cooled by the heat dissipation and dehydration device 5, completing a cycle cooling. The above structure does not require special operation, and after the driver releases the pedal of the air brake valve 2, the cooling cycle of the brake fluid can be realized, thereby effectively controlling the temperature of the brake fluid.

[0022] The heat dissipation and water removal device 5 is provided with a hydrophilic fiber net and a molecular sieve. With the above structure, the hydrophilic fiber net and the molecular sieve in the heat dissipation and water removal device 5 can absorb impurities and water in the brake fluid.

[0023] The oil-injected air booster pump 3 comprises a housing, a piston is arranged in the housing, and a return spring is arranged on the side of the piston close to the air outlet of the air booster pump 3. With the above structure, when the oil-injected air booster pump 3 injects brake fluid into the brake wheel cylinder 7, the piston moves forward to squeeze the return spring, and after the driver releases the pedal of the air brake valve 2, the return spring is reset to push the piston to achieve reset.

[0024] The oil-injected air booster pump 4 includes a housing, a piston is arranged in the housing, and a return spring is arranged on the side of the piston close to the air outlet of the air booster pump 3. In the above structure, when the oil-injected air booster pump 3 injects brake fluid into the brake wheel cylinder 7, the piston moves forward to squeeze the return spring, and after the driver releases the pedal of the air brake valve 2, the return spring is reset to push the piston to achieve reset.

[0025] The present invention also relates to a brake circulation cooling method for an engineering machinery vehicle, which has simple steps, effectively reduces the temperature of the brake fluid to room temperature, realizes the circulation, cooling and water removal of the high-temperature brake fluid, and ensures the driving safety of the vehicle. The cooling steps of the brake circulation cooling method for an engineering machinery vehicle are: S1. When the mechanical vehicle starts, the air source supplies air to the air reservoir 1 until the brake pressure is reached; when the mechanical vehicle brakes, the driver steps on the air brake valve 2 pedal, and the compressed air in the air reservoir 1 enters from the air inlet of the oil-injection air booster pump 3 and the air inlet of the oil-extraction air booster pump 4 through the air outlet of the air brake valve 2. The pistons of the oil-injection air booster pump 3 and the oil-extraction air booster pump 4 move forward respectively, and the oil-injection air booster pump 3 and the oil-extraction air booster pump 4 generate hydraulic pressure, which is injected into the brake wheel cylinder 7 to generate braking force, so that the mechanical vehicle brakes. Mechanical vehicle deceleration and braking; S2. When the mechanical vehicle releases the brake, when the driver releases the air brake valve 2 pedal, the gas in the oil-filled air booster pump 3 and the oil-extracted air booster pump 4 is discharged to the atmosphere through the air brake valve 2, and the pistons of the oil-filled air booster pump 3 and the oil-extracted air booster pump 4 return to their respective positions under the action of their respective springs, and the high-temperature brake fluid in the brake wheel cylinder 7 is pumped into the return oil to the heat dissipation and dehydration device 5 through the oil-extracted air booster pump 4, and then flows back to the liquid storage tank 6 for storage after being cooled by the heat dissipation and dehydration device 5, completing a cycle cooling. The method of the present invention, 1. The components of the system are all mature products that are widely sold on the market, with low cost and easy installation and debugging; 2. The system is a closed circulation system, which is less affected by the external environment and is more reliable and durable; 3. The system can work fully automatically, without the need for additional operation by the driver, and will not increase the additional operation burden; 4. It can be installed on a variety of vehicle models, with good adaptability and low installation difficulty, and can be widely promoted and applied.

[0026] The engineering machinery vehicle brake circulation cooling system described in the present invention comprises an air storage cylinder 1 for storing air, an air inlet of the air storage cylinder 1 being connected to an air source, the air source being used to supply air to the air storage cylinder 1, an air outlet of the air storage cylinder 1 being connected to an air brake valve 2, the air brake valve 2 being used to control the on-off of air, an air outlet of the air brake valve 2 being respectively connected to an air inlet of an oil-injection air booster pump 3 and an oil-extraction air booster pump 4, air being fed into the oil-injection air booster pump 3 and the oil-extraction air booster pump 4, an oil inlet of the oil-injection air booster pump 3 being connected to an oil outlet of a liquid storage tank 6, and the liquid storage tank 6 being used to The brake fluid (brake oil) is stored and the brake fluid can be supplied to the brake wheel cylinder 7 through the oil-filling air booster pump 3. The oil outlet of the fluid storage tank 6 is connected to the oil-filling air booster pump 3. The oil suction port of the oil-drawing air booster pump 4 is connected to the brake wheel cylinder 7. The oil return port of the oil-drawing air booster pump 4 is connected to the oil inlet of the heat dissipation and dehydration device 5. The oil-drawing air booster pump 4 is also used to pump back the air of the brake wheel cylinder 7, so that the brake fluid in the brake wheel cylinder 7 is pumped into the heat dissipation and dehydration device 5 for cooling the brake fluid, and then the brake fluid flows back to the oil inlet of the fluid storage tank 6. The working principle of the cooling system of the present invention is: when the driver steps on the pedal of the air brake valve 2, the compressed air enters the oil-injecting air booster pump 3 and the oil-injecting air booster pump 4 from the air reservoir 1 through the air brake valve 2 along the pipeline at the same time, and at the same time pushes the pistons of the two booster pumps forward. The forward movement of the piston compresses the brake fluid, so that liquid pressure is generated in the pipeline. At this time, the piston of the oil-injecting air booster pump 4 moves forward to send in air and the rear piston blocks the oil extraction port of the oil-injecting air booster pump 4, so that the brake fluid cannot enter the oil-injecting air booster pump 4. The high-pressure brake fluid enters the two brake wheel cylinders 7 of the front axle of the vehicle along the pipeline at the same time, pushing the piston of the brake wheel cylinder 7 to move, generating braking force, causing the friction lining to rub against the brake disc (or brake drum), thereby slowing down and braking the vehicle. When the driver releases the pedal of the air brake valve 2, the compressed air is discharged from the oil-filled air booster pump 3 and the oil-extracted air booster pump 4 to the atmosphere through the pipeline from the exhaust port of the air brake valve 2, and the system is depressurized. The pistons of the oil-filled air booster pump 3 and the oil-extracted air booster pump 4 return to their original positions under the action of the return spring, driving the pistons to return to their original positions. The high-temperature brake fluid generated by friction in the brake wheel cylinder 7 flows back along the pipeline. Because the one-way valve 17 of the oil-filled air booster pump 3 blocks the passage into the oil-filled air booster pump 3, and the piston return of the oil-extracted air booster pump 4 generates suction, the high-temperature brake fluid is drawn into the heat dissipation and dehydration device 5 along the pipeline for cooling, and the cooled brake fluid flows back to the fluid storage tank 6. In this way, a brake fluid cycle is completed. The cooled brake fluid can be used for the brake fluid supply for the next braking. During this process, the high-temperature brake fluid dissipates heat and absorbs water through the pipeline and the heat dissipation and dehydration device 5, and then flows back to the storage tank 6 which stores a large amount of normal-temperature brake fluid. The brake fluid will quickly drop to room temperature, which is far lower than the boiling point of the brake fluid (generally 203°C), thus preventing the boiling and overflow of the brake fluid, ensuring the safety of the brake system and thus the braking safety of the entire vehicle.The system of the present invention, 1. By making the oil filling air booster pump and the oil extraction air booster pump operate simultaneously, the overheated brake fluid can be pumped into the circulating cooling pipeline when the brake fluid returns, so as to prevent the high temperature of the brake fluid from damaging the brake pipeline and the air booster pump. 2. By making the return high-temperature brake fluid flow through the heat dissipation and water removal device, the high temperature is initially dissipated and the water therein is sucked out. 3. By making the return brake fluid flow into a large-volume fluid storage tank and mix with a large amount of normal-temperature brake fluid, the temperature of the brake fluid is reduced to normal temperature and is used by the oil filling air booster pump, thereby finally realizing the circulation, cooling and water removal functions of the high-temperature brake fluid.

[0027] The present invention is described above by way of example in conjunction with the accompanying drawings. It is obvious that the specific implementation of the present invention is not limited to the above-mentioned method. As long as various improvements are made using the method concept and technical solution of the present invention, or the concept and technical solution of the present invention are directly applied to other occasions without improvement, they are all within the protection scope of the present invention.

Claims

1. A brake circulation cooling system for an engineering machinery vehicle, characterized in that: The air inlet of the air storage cylinder (1) is connected to the air source, the air outlet of the air storage cylinder (1) is connected to the air brake valve (2), the air outlet of the air brake valve (2) is respectively connected to the air inlet of the oil injection air booster pump (3) and the oil extraction air booster pump (4), the oil inlet of the oil injection air booster pump (3) is connected to the oil outlet of the liquid storage tank (6), the oil outlet of the oil injection air booster pump (3) is connected to the brake wheel cylinder (7), the oil extraction port of the oil extraction air booster pump (4) is connected to the brake wheel cylinder (7), the oil return port of the oil extraction air booster pump (4) is connected to the oil inlet of the heat dissipation dehydrator (5), and the oil outlet of the heat dissipation dehydrator (5) is connected to the oil inlet of the liquid storage tank (6).

2. The brake circulation cooling system for construction machinery vehicles according to claim 1 is characterized in that: The air outlet of the air storage cylinder (1) is connected to the air brake valve (2) through the first pipeline (8), the air brake valve (2) is connected to one end of the second pipeline (9), the other end of the second pipeline (9) is connected to the oil injection air booster pump (3) through the first branch pipe (10), and the other end of the second pipeline (9) is connected to the oil extraction air booster pump (4) through the second branch pipe (11).

3. The brake circulation cooling system for construction machinery vehicles according to claim 2 is characterized in that: The oil inlet of the oil-injected air booster pump (3) is connected to the oil outlet of the liquid storage tank (6) through a third pipeline (12), and the oil outlet of the liquid storage tank (6) is connected to the brake wheel cylinder (7) through a fourth pipeline (13).

4. The brake circulation cooling system for engineering machinery vehicles according to claim 3 is characterized in that: The oil extraction port of the oil extraction air booster pump (4) is connected to the brake wheel cylinder (7) through the fifth pipeline (14), the oil return port of the oil extraction air booster pump (4) is connected to the oil inlet of the heat dissipation and dehydration device (5) through the sixth pipeline (15), and the oil outlet of the heat dissipation and dehydration device (5) is connected to the oil inlet of the liquid storage tank (6) through the seventh pipeline (16).

5. The brake circulation cooling system for construction machinery vehicles according to claim 1, characterized in that: When the engineering machinery vehicle starts, the air source supplies air to the air reservoir (1) until the brake pressure is reached; when the engineering machinery vehicle brakes, the driver steps on the air brake valve (2) pedal, and the compressed air in the air reservoir (1) enters through the air outlet of the air brake valve (2) from the air inlet of the oil injection air booster pump (3) and the air inlet of the oil extraction air booster pump (4), respectively, and the pistons of the oil injection air booster pump (3) and the oil extraction air booster pump (4) move forward respectively, and the oil injection air booster pump (3) and the oil extraction air booster pump (4) generate hydraulic pressure, which is injected into the brake wheel cylinder (7) to generate braking force, so that the mechanical vehicle slows down and brakes.

6. The brake circulation cooling system for construction machinery vehicles according to claim 1, characterized in that: When the engineering machinery vehicle releases the brakes and the driver releases the air brake valve (2) pedal, the gas in the oil-injection air booster pump (3) and the oil-extraction air booster pump (4) is discharged to the atmosphere through the air brake valve (2), and the pistons of the oil-injection air booster pump (3) and the oil-extraction air booster pump (4) return to their positions under the action of their own springs. The high-temperature brake fluid in the brake wheel cylinder (7) is pumped into the return oil to the heat dissipation and dehydration device (5) through the oil-extraction air booster pump (4), and then flows back to the liquid storage tank (6) for storage after being cooled by the heat dissipation and dehydration device (5), completing a cycle cooling.

7. The engineering machinery vehicle brake circulation cooling system according to claim 1 or 2, characterized in that: The heat dissipation and dehumidification device (5) is provided with a hydrophilic fiber net and a molecular sieve.

8. The engineering machinery vehicle brake circulation cooling system according to claim 1 or 2, characterized in that: The oil-injected air booster pump (3) comprises a housing, a piston is arranged in the housing, and a return spring is arranged on the side of the piston close to the air outlet of the air booster pump (3).

9. The mechanical vehicle brake circulation cooling system according to claim 1 or 2, characterized in that: The oil extraction air booster pump (4) comprises a housing, a piston is arranged inside the housing, and a return spring is arranged on the side of the piston close to the air outlet of the air booster pump (3).

10. A brake cycle cooling method for an engineering machinery vehicle, characterized in that: The cooling steps of the mechanical vehicle brake cycle cooling method are: S1. When the engineering machinery vehicle starts, the air source supplies air to the air reservoir (1) until the brake pressure is reached; when the engineering machinery vehicle brakes, the driver steps on the air brake valve (2) pedal, and the compressed air in the air reservoir (1) enters through the air outlet of the air brake valve (2) from the air inlet of the oil injection air booster pump (3) and the air inlet of the oil extraction air booster pump (4), respectively, and the pistons of the oil injection air booster pump (3) and the oil extraction air booster pump (4) move forward respectively, and the oil injection air booster pump (3) and the oil extraction air booster pump (4) generate hydraulic pressure, which is injected into the brake wheel cylinder (7) to generate braking force, so that the mechanical vehicle decelerates and brakes; S2. When the engineering vehicle is released from braking and the driver releases the air brake valve (2) pedal, the gas in the oil-injection air booster pump (3) and the oil-extraction air booster pump (4) is discharged to the atmosphere through the air brake valve (2), and the pistons of the oil-injection air booster pump (3) and the oil-extraction air booster pump (4) return to their original positions under the action of their respective springs. The high-temperature brake fluid in the brake wheel cylinder (7) is pumped into the return oil to the heat sink and dehydrator (5) through the oil-extraction air booster pump (4), and then flows back to the liquid storage tank (6) for storage after being cooled in the heat sink and dehydrator (5), completing a cycle of cooling.

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