A hydraulic brake valve group, hydraulic brake system and mine dump truck

Abstract

The utility model discloses a hydraulic brake valve group, hydraulic braking system and mine dump truck, including hydraulic brake valve group, hydraulic oil tank, pressure sensor, energy accumulator, brake pedal, front brake, rear brake and parking brake, hydraulic brake valve group includes valve body and the one -way valve of integration in valve body, emergency brake solenoid valve, pressure reducing valve, loading brake solenoid valve, throttle valve, pressure reducing valve and parking brake solenoid valve, brake pedal is linked with A1 mouth, A2 mouth and A3 mouth of valve body, front brake, rear brake are linked with brake pedal and the A4 mouth of valve body, parking brake is linked with D mouth of valve body, energy accumulator is linked with B mouth of valve body, pressure sensor is linked with C mouth of valve body, and hydraulic oil tank is linked with T mouth and T1 mouth of valve body. The utility model aims at designing a kind of hydraulic brake valve group, satisfies the required of mine dump truck various working conditions braking performance.

Description

Technical Field

[0001] This utility model relates to a hydraulic brake valve assembly, belonging to the technical field of mining dump trucks. Background Technology

[0002] Mining dump trucks, as specialized heavy-duty vehicles used in open-pit mines and large-scale infrastructure projects, have high requirements for braking performance due to their heavy loads and complex, harsh working conditions. Existing brake valve assembly designs are incomplete; to ensure driver safety, the functional design of the brake valve assembly must be rigorous and comprehensive, meeting the needs of both daily operations and emergencies. Summary of the Invention

[0003] In view of the shortcomings of the existing technology, this utility model aims to design a hydraulic brake valve group to meet the braking performance requirements of mining dump trucks under various working conditions.

[0004] This utility model is achieved according to the following technical solution: In a first aspect, this utility model provides a hydraulic brake valve assembly, including a valve body, wherein a loading brake solenoid valve, a parking brake solenoid valve, and an emergency brake solenoid valve are integrated within the valve body; the P port on the valve body is connected to an external pressure oil source, and the pressure oil is divided into two main paths through the P port, namely: The main oil flows to the inlet of the parking brake solenoid valve, and the outlet of the parking brake solenoid valve is connected to port D on the valve body. The other main oil line flows in through a check valve and then splits into several branches, namely: The P port is connected to the auxiliary port on the valve body to form the first branch; The oil inlet of the emergency braking solenoid valve is connected to a check valve, and the oil outlet of the emergency braking solenoid valve is connected to port A1 on the valve body, forming a second branch. The A2 port on the valve body is connected to a check valve to form a third branch; The A3 port on the valve body is connected to a check valve to form a fourth branch. The oil inlet of the loading brake solenoid valve is connected to a check valve, and the oil outlet of the loading brake solenoid valve is connected to port A4 on the valve body, forming a fifth branch.

[0005] In some embodiments, the valve body also integrates a pressure reducing valve for regulating the oil pressure in the pipeline. The pressure reducing valve is arranged in the pipeline between the P port and the parking brake solenoid valve, and the spring side oil port of the pressure reducing valve is connected to the T1 port on the valve body.

[0006] In some embodiments, the valve body also integrates a pressure reducing valve for regulating the oil pressure in the pipeline. The pressure reducing valve is arranged in the pipeline between the check valve and the loading brake solenoid valve, and the spring-side oil port of the pressure reducing valve is connected to the T-port on the valve body.

[0007] In some embodiments, the valve body also integrates a throttle valve, which is connected to a T-port on the valve body.

[0008] Secondly, this utility model provides a hydraulic braking system, comprising: The aforementioned hydraulic brake valve assembly; The brake pedal is connected to ports A1, A2, and A3 of the valve body; The travel brake is connected to the brake pedal and the A4 port of the valve body; The parking brake is connected to port D of the valve body; The hydraulic oil tank is connected to the T port and T1 port of the valve body.

[0009] In some embodiments, the travel brake includes a front brake and a rear brake, which are respectively connected to a brake pedal, and the rear brake is connected to port A4 of the valve body.

[0010] In some embodiments, an accumulator for storing oil is also included, the auxiliary port including port B, and the accumulator is connected to port B.

[0011] In some embodiments, a pressure sensor for detecting the oil pressure of the hydraulic brake valve assembly is also included. The auxiliary port includes a C port, and the pressure sensor is connected to the C port. When the pressure sensor detects that the pressure is lower than a preset value, the emergency brake solenoid valve is energized, and the vehicle emergency brake is automatically triggered.

[0012] In some embodiments, the loading brake solenoid valve is electrically connected to the loading brake switch located in the cab. When the vehicle is loading or unloading, the loading brake switch is used to brake or release the vehicle. The parking brake solenoid valve is electrically connected to the gear shift lever located in the cab. The parking brake is controlled by the gear shift lever.

[0013] Thirdly, this utility model provides a mining dump truck, including the aforementioned hydraulic brake valve assembly; or, including the aforementioned hydraulic brake system.

[0014] The beneficial effects of this utility model are: 1. The brake valve assembly is equipped with a loading brake solenoid valve, which can be controlled by a switch in the cab when the vehicle is loading or unloading, making it easy to operate.

[0015] 2. The brake valve assembly is equipped with a parking brake solenoid valve, which is integrated into the gear shift lever in the cab when energized and de-energized. The parking brake can be applied or released by controlling the gear shift lever.

[0016] 3. The brake valve assembly is equipped with an emergency brake solenoid valve. When the pressure is lower than the set value, the solenoid valve is energized and automatically triggers the vehicle's emergency braking, improving vehicle driving safety and protecting the driver's personal safety. Attached Figure Description

[0017] The accompanying drawings, as part of this utility model, are used to provide a further understanding of the present utility model. The illustrative embodiments and descriptions of the present utility model are used to explain the present utility model, but do not constitute an undue limitation of the present utility model. Obviously, the drawings described below are merely some embodiments; those skilled in the art can obtain other drawings based on these drawings without any creative effort.

[0018] In the attached diagram: Figure 1 This is a schematic diagram of a hydraulic brake valve assembly according to the present invention; Attached diagram labels: 1. Hydraulic brake valve assembly, 2. Hydraulic oil tank, 3. Check valve, 4. Pressure sensor, 5. Accumulator, 6. Emergency brake solenoid valve, 7. Pressure reducing valve, 8. Loading brake solenoid valve, 9. Brake pedal, 10. Front brake, 11. Rear brake, 12. Throttle valve, 13. Pressure reducing valve, 14. Parking brake solenoid valve, 15. Parking brake.

[0019] It should be noted that these accompanying drawings and textual descriptions are not intended to limit the scope of the present invention in any way, but rather to illustrate the concept of the present invention to those skilled in the art by referring to specific embodiments. Detailed Implementation

[0020] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions in the embodiments will be clearly and completely described below with reference to the accompanying drawings. The following embodiments are used to illustrate this utility model, but are not intended to limit the scope of this utility model.

[0021] 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 or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0022] Figure 1 A schematic diagram of a hydraulic braking system is provided, including a hydraulic brake valve assembly 1, a hydraulic oil tank 2, a pressure sensor 4, an accumulator 5, a brake pedal 9, a front brake 10, a rear brake 11, and a parking brake 15. The hydraulic brake valve assembly 1 is... Figure 1 The entire component assembly within the dashed box includes the valve body and the one-way valve 3, emergency brake solenoid valve 6, pressure reducing valve 7, loading brake solenoid valve 8, throttle valve 12, pressure reducing valve 13, and parking brake solenoid valve 14 integrated within the valve body. The valve body is equipped with ports P, A1, A2, A3, A4, B, C, D, T, and T1.

[0023] Pressurized oil enters through port P of hydraulic brake valve assembly 1 and is divided into two paths. One path of oil passes through pressure reducing valve 13 and acts on the inlet of parking brake solenoid valve 14. The outlet of parking brake solenoid valve 14 is connected to parking brake 15 through port D. The other path of oil flows in through check valve 3 and is then divided into five paths.

[0024] The first path acts on the accumulator 5 through port B and on the pressure sensor 4 through port C; the second path acts on the bottom inlet of the emergency brake solenoid valve 6, and the top outlet of the emergency brake solenoid valve 6 acts on the pilot port of the brake pedal 9 through port A1; the third and fourth paths act on the inlet of the brake pedal 9 through ports A2 and A3; the fifth path acts on the bottom inlet of the load brake solenoid valve 8 through the pressure reducing valve 7, and the top outlet of the load brake solenoid valve 8 acts on the rear brake 11 through port A4; the outlet of the brake pedal 9 is connected to the front brake 10 and the rear brake 11.

[0025] When the vehicle is in normal operation and the driver does not perform any braking operation, the emergency brake solenoid valve 6 and the loading brake solenoid valve 8 are not energized. The pressure oil passing through the one-way valve 3 is cut off at the bottom oil port of the emergency brake solenoid valve 6 and the loading brake solenoid valve 8. The parking brake solenoid valve 14 is energized, and the pressure oil at port P passes through the pressure reducing valve 13 and the parking brake solenoid valve 14, and acts on the parking brake 15 through port D. The pilot oil port of the brake pedal 9 is connected to the hydraulic oil tank 2 through port A1 and the emergency brake solenoid valve 6, and through port T1. The rear brake 11 is connected to the hydraulic oil tank 2 through port A4 and the loading brake solenoid valve 8. The spring-side oil ports of the pressure reducing valve 7 and the pressure reducing valve 13 are connected to the hydraulic oil tank 2 through ports T1 and T.

[0026] It should be noted that the one-way valve 3 ensures that the oil can only flow in from the left side, preventing backflow and consumption of the braking system's oil supply. The pressure sensor 4 detects the real-time pressure of the brake valve assembly 1. The accumulator 5 stores oil, stabilizes system pressure, absorbs shocks and pulsations, and provides an emergency power source in case of system failure. The pressure reducing valves 7 and 13 can be precisely adjusted according to the brake's required pressure, ensuring normal brake operation. Under normal operating conditions, the top and bottom ports of the throttle valve 12 are closed, ensuring that the brake system pressure oil does not flow back to the hydraulic oil tank 2 through the throttle valve 12. When the mine car is under maintenance, the brake system pressure can be released by opening the throttle valve 12, ensuring the safety of maintenance personnel.

[0027] In a further embodiment, the loading brake solenoid valve 8 is electrically connected to the loading brake switch located in the cab. When the vehicle is loading or unloading, the loading brake switch is used to brake or release the vehicle. The parking brake solenoid valve 14 is electrically connected to the gear shift lever located in the cab. The parking brake is controlled by the gear shift lever.

[0028] Working principle: such as Figure 1 As shown, when the driver depresses the brake pedal, the brake pedal 9 valve core moves, connecting the inlet and outlet ports. Hydraulic oil from ports A2 and A3 of brake valve group 1 flows through brake pedal 9 to the front brake 10 and rear brake 11, braking the vehicle. When the mine car is loading or unloading, the driver presses the loading brake switch, energizing the loading brake solenoid valve 8. The valve core moves to the left, and hydraulic oil flows through pressure reducing valve 7 and loading brake solenoid valve 8 to the rear brake 11. After the vehicle stops, the driver puts the gear lever in the parking position. The parking brake solenoid valve 14 is de-energized, and the solenoid valve core moves downward. The hydraulic oil passing through pressure reducing valve 13 is stopped on the left side of the parking brake solenoid valve 14. The parking brake oil flows back to the hydraulic oil tank 2 through port T of the parking brake solenoid valve 14, releasing the pressure. The parking brake spring applies spring force, achieving parking braking. When a system malfunctions, if the pressure sensor 4 detects that the pressure of the brake valve assembly 1 is lower than the set value, the emergency brake solenoid valve 6 is energized, the valve core moves to the left, and the pressure oil passing through the one-way valve 3 flows through the oil port at the bottom of the emergency brake solenoid valve 6, and acts on the brake pedal 9 through port A1. The oil finally acts on the front brake 10 and the rear brake 11 to realize the emergency braking function.

[0029] In summary, this utility model provides a hydraulic braking system that achieves the following functions and effects: 1. The brake valve assembly is equipped with a loading brake solenoid valve, which can be controlled by a switch in the cab when the vehicle is loading or unloading, making it easy to operate.

[0030] 2. The brake valve assembly is equipped with a parking brake solenoid valve, which is integrated into the gear shift lever in the cab when energized and de-energized. The parking brake can be applied or released by controlling the gear shift lever.

[0031] 3. The brake valve assembly is equipped with an emergency brake solenoid valve. When the pressure is lower than the set value, the solenoid valve is energized and automatically triggers the vehicle's emergency braking, improving vehicle driving safety and protecting the driver's personal safety.

[0032] The mining dump truck provided by this utility model is described below. The mining dump truck described below can be referred to in correspondence with the hydraulic braking system described above.

[0033] The present invention provides a mining dump truck, which may include the hydraulic braking system described in any of the above embodiments.

[0034] The beneficial effects achieved by the mining dump truck provided by this utility model are consistent with the beneficial effects achieved by the hydraulic braking system provided by this utility model, so they will not be repeated here.

[0035] Numerous specific details are set forth in the specification provided herein. However, it will be understood that embodiments of the present invention may be practiced without these specific details. In some instances, well-known methods, structures, and techniques have not been shown in detail so as not to obscure the understanding of this specification.

[0036] Furthermore, those skilled in the art will understand that although some embodiments described herein include certain features found in other embodiments but not others, combinations of features from different embodiments are also within the scope of protection of this invention and form different embodiments. For example, in the embodiments described above, those skilled in the art can use them in combination based on known technical solutions and the technical problems to be solved by this application.

[0037] The above description is merely a preferred embodiment of the present utility model and is not intended to limit the present utility model in any way. Although the present utility model has been disclosed above with reference to a preferred embodiment, it is not intended to limit the present utility model. Any person skilled in the art can make some modifications or alterations to the above-described technical content to create equivalent embodiments without departing from the scope of the present utility model. Any simple modifications, equivalent changes, and alterations made to the above embodiments based on the technical essence of the present utility model without departing from the scope of the present utility model shall still fall within the scope of the present utility model.

Claims

1. A hydraulic brake valve assembly, characterized in that: The valve body includes a loading brake solenoid valve, a parking brake solenoid valve, and an emergency brake solenoid valve. The P port on the valve body is connected to an external pressure oil source, and the pressure oil is divided into two main paths through the P port: The main oil flows to the inlet of the parking brake solenoid valve, and the outlet of the parking brake solenoid valve is connected to port D on the valve body. The other main oil line flows in through a check valve and then splits into several branches, namely: The P port is connected to the auxiliary port on the valve body to form the first branch; The oil inlet of the emergency braking solenoid valve is connected to a check valve, and the oil outlet of the emergency braking solenoid valve is connected to port A1 on the valve body, forming a second branch. The A2 port on the valve body is connected to a check valve to form a third branch; The A3 port on the valve body is connected to a check valve to form a fourth branch. The oil inlet of the loading brake solenoid valve is connected to a check valve, and the oil outlet of the loading brake solenoid valve is connected to port A4 on the valve body, forming a fifth branch.

2. The hydraulic brake valve assembly according to claim 1, characterized in that: The valve body also integrates a pressure reducing valve for regulating the oil pressure in the pipeline. The pressure reducing valve is arranged in the pipeline between the P port and the parking brake solenoid valve, and the spring side oil port of the pressure reducing valve is connected to the T1 port on the valve body.

3. A hydraulic brake valve assembly according to claim 1, characterized in that: The valve body also integrates a pressure reducing valve for regulating the oil pressure in the pipeline. The pressure reducing valve is arranged in the pipeline between the check valve and the loading brake solenoid valve, and the spring side oil port of the pressure reducing valve is connected to the T port on the valve body.

4. A hydraulic brake valve assembly according to claim 1, characterized in that: The valve body also integrates a throttle valve, which is connected to the T-port on the valve body.

5. A hydraulic braking system, characterized in that, include: The hydraulic brake valve assembly according to any one of claims 1 to 4; The brake pedal is connected to ports A1, A2, and A3 of the valve body; The travel brake is connected to the brake pedal and the A4 port of the valve body; The parking brake is connected to port D of the valve body; The hydraulic oil tank is connected to the T port and T1 port of the valve body.

6. A hydraulic braking system according to claim 5, characterized in that: The travel brake includes a front brake and a rear brake, which are respectively connected to the brake pedal, and the rear brake is connected to port A4 of the valve body.

7. A hydraulic braking system according to claim 5, characterized in that: It also includes an accumulator for storing oil, and the auxiliary port includes port B, to which the accumulator is connected.

8. A hydraulic braking system according to claim 5, characterized in that: It also includes a pressure sensor for detecting the oil pressure of the hydraulic brake valve assembly. The auxiliary port includes port C, and the pressure sensor is connected to port C. When the pressure sensor detects that the pressure is lower than a preset value, the emergency brake solenoid valve is energized, automatically triggering the vehicle's emergency braking.

9. A hydraulic braking system according to claim 5, characterized in that: The loading brake solenoid valve is electrically connected to the loading brake switch located in the cab. When the vehicle is loading or unloading, the loading brake switch is used to brake or release the vehicle. The parking brake solenoid valve is electrically connected to the gear shift lever located in the driver's cab, and the parking brake is applied or released by controlling the gear shift lever.

10. A mining dump truck, characterized in that: It includes the hydraulic brake valve assembly according to any one of claims 1 to 4; or, it includes the hydraulic brake system according to any one of claims 5 to 9.

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