Drive-by-wire brake valve group for inspection vehicle

Abstract

The utility model relates to a drive-by-wire brake valve group for an inspection vehicle, and belongs to the technical field of brake systems, in particular to the technical field of brake systems of anti-explosion inspection vehicles. The hydraulic brake system special for the anti-explosion inspection vehicle is constructed by arranging the priority valve, the pressure compensation valve, the proportional pressure reducing valve, the high-pressure selection valve and other valve structures, hydraulic rubber pipes of the foot valve, the brake valve and the brake can be reduced, the driving space is released, shorter brake response time can be achieved, and the service life of the anti-explosion inspection vehicle is prolonged. The brake distance is reduced, the safety is improved, and the oil leakage phenomenon of a cab is avoided. In addition, when one energy accumulator fails, the arrangement of the high-pressure selection valve ensures that the other energy accumulator can still work normally, and the safety is further improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to a line control brake valve group for inspection vehicle belongs to brake system technical field, especially is the brake system technical field of explosion -proof inspection vehicle. BACKGROUND

[0002] The explosion -proof inspection vehicle is a kind of vehicle specially used for inspection and monitoring in dangerous environment (such as petroleum, chemical industry etc.), and its brake system must consider the requirements of explosion -proof and safety in design.Due to the particularity of working environment, the brake system of explosion -proof inspection vehicle needs to be detected and maintained regularly, to ensure that it is always in good working condition and sealing.

[0003] The brake system of existing security, carrying equipment is all hydraulic brake, adopts foot valve control brake pump to brake high pressure oil on-off, foot valve is usually installed in cab.However, since foot valve and brake pump, brake all adopt hydraulic rubber tube connection, this hydraulic rubber tube not only occupies the space of driving, but also is easy to leak oil, its sealing property is difficult to guarantee, will lead to driving and operation process to be seriously affected.

[0004] At present, there is still lack of hydraulic brake system that can be applied to explosion -proof inspection vehicle and meet the requirements of reducing manual strength, improving safety and sealing in prior art. CONTENT OF UTILITY MODEL

[0005] To solve the above problems, the utility model provides a line control brake valve group for inspection vehicle, with P port for high pressure oil supply, O port for auxiliary functional oil outlet, A1 port and A2 port for connecting two accumulators respectively, PB port for connecting parking brake port, B port for connecting service brake port;

[0006] The line control brake valve group for inspection vehicle further includes priority valve and pressure compensation valve connected in sequence from P port, and the pressure compensation valve is controlled according to the pressure of A1 port and A2 port;And proportional pressure reducing valve connected with B port, electromagnetic ball valve connected with PB port and hand pump, the on-off of proportional pressure reducing valve is controlled by the signal of foot brake connected with service brake port, and the on-off of electromagnetic ball valve is controlled by the signal of parking brake port.

[0007] Further, A1 port and A2 port are provided with high pressure selection valve, the high pressure selection valve is connected with priority valve and proportional pressure reducing valve, and the high pressure selection valve can cut off the oil circuit connected with the failed accumulator.

[0008] Further, the high pressure selection valve can compare the pressure of accumulator connection port A1 and A2, when the pressure of A1 port is greater than A2 port, the high pressure selection valve will cut off A1 port to A2 port.

[0009] Further, the proportional pressure reducing valve is a straight-through proportional pressure reducing valve.

[0010] Further, the electromagnetic ball valve is configured with a pressure reducing valve.

[0011] Further, the priority valve can provide high-pressure oil of the P port to the high-pressure selection valve preferentially, thereby being shared by the A1 port and the A2 port, and when the pressure of the A1 port and the A2 port reaches a set value, the high-pressure oil of the P port bypasses the priority valve to the O port for auxiliary function oil outlet.

[0012] Further, the pressure compensation valve can detect the A1 port and the A2 port, and when the pressure of the A1 port and the A2 port reaches a set value, the pressure compensation valve is opened, the high-pressure oil of the pressure compensation valve enters the control port of the priority valve, the spool of the priority valve is opened, and the high-pressure oil of the P port bypasses the priority valve to the O port for auxiliary function oil outlet.

[0013] Further, the priority valve is configured with a relief valve.

[0014] The hydraulic braking system for the explosion-proof patrol vehicle has the advantages that:

[0015] The hydraulic braking system for the explosion-proof patrol vehicle has the advantages that: BRIEF DESCRIPTION OF DRAWINGS

[0016] Figure 1 It is a schematic diagram of the overall structure in an embodiment of the hydraulic braking system for the explosion-proof patrol vehicle;

[0017] In the figure, 1 is a relief valve, 2 is a priority valve, 3 is a proportional pressure reducing valve, 4 is an electromagnetic ball valve, 5 is a hand pump, 6 is a pressure reducing valve, 7 is a high-pressure selection valve, and 8 is a pressure compensation valve. DETAILED DESCRIPTION

[0018] The technical solutions of the hydraulic braking system for the explosion-proof patrol vehicle will be described clearly and completely below with reference to the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the hydraulic braking system for the explosion-proof patrol vehicle, rather than all the embodiments. Based on the embodiments in the hydraulic braking system for the explosion-proof patrol vehicle, all other embodiments obtained by those skilled in the art without creative labor fall within the protection scope of the hydraulic braking system for the explosion-proof patrol vehicle.

[0019] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this utility model and for simplifying the description, and do not 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. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance. Specifically, the terms "first position" and "second position" refer to two different positions.

[0020] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to fixed connections or detachable connections; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; and internal connections between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0021] Example 1

[0022] This utility model provides a wire-controlled brake valve assembly for an inspection vehicle, which has a P port for high-pressure oil supply, an O port for functional oil inlet, A1 and A2 ports respectively connected to two accumulators, a PB port connected to the parking brake port, a B port connected to the service brake port, and a T port.

[0023] The inspection vehicle's wire-controlled brake valve group also includes a priority valve 2 and a pressure compensation valve 8 connected sequentially from the P port. The pressure compensation valve 8 is controlled to open and close according to the pressure at ports A1 and A2. When the pressure at ports A1 and A2 reaches the set value, the pressure compensation valve 8 opens, and the oil passing through the pressure compensation valve 8 returns to the control port of the priority valve 2. When the priority valve 2 opens, the high-pressure oil passes through the priority valve 2 to port O, thereby realizing the charging and charging cut-off of the accumulator.

[0024] It also includes a proportional pressure reducing valve connected to port B, an electromagnetic ball valve 4 connected to port PB, and a manual pump 5. The opening and closing of the proportional pressure reducing valve is controlled by a signal from the foot brake connected to the service brake port. The foot brake will give an analog signal according to the amplitude of foot pressing. The vehicle controller collects the analog signal and calculates and outputs a signal to the proportional pressure reducing valve. The opening and closing of the electromagnetic ball valve 4 is controlled by a signal from the parking brake port.

[0025] Furthermore, the A1 and A2 ports are equipped with a high-pressure selection valve 7. The high-pressure selection valve 7 can compare the pressure of the accumulator connection ports A1 and A2. When the pressure of port A1 is greater than that of port A2, the high-pressure selection valve 7 will cut off the connection between port A1 and port A2. The high-pressure selection valve 7 is connected to the priority valve 2 and the proportional pressure reducing valve. The high-pressure selection valve 7 can cut off the oil circuit connected to the failed accumulator.

[0026] The priority valve 2 prioritizes the supply of high-pressure oil from port P to the high-pressure selector valve 7, thus sharing the oil supply between ports A1 and A2. When the pressures at ports A1 and A2 reach a set value, the high-pressure oil from port P bypasses through the priority valve 2 to port O, the outlet for auxiliary functions. The pressure compensation valve 8 detects ports A1 and A2. When the pressures at ports A1 and A2 reach a set value, the pressure compensation valve 8 opens, allowing the high-pressure oil from the pressure compensation valve 8 to enter the control port of the priority valve 2. This causes the valve core of the priority valve 2 to open, and the high-pressure oil from port P bypasses through the priority valve 2 to port O, the outlet for auxiliary functions.

[0027] Furthermore, the proportional pressure reducing valve needs to be a straight-through proportional pressure reducing valve with a small internal leakage, including a first proportional pressure reducing valve 3.1 and a second proportional pressure reducing valve 3.2 connected in parallel.

[0028] Furthermore, the electromagnetic ball valve 4 is equipped with a pressure reducing valve 6, which serves to output a stable pressure by passing the high-pressure oil at port P through the pressure reducing valve, ensuring stable release of the parking brake. The priority valve 2 is equipped with a relief valve 1, which serves to limit the pressure at port P, ensuring that the pressure at port P is within the set pressure range, thus ensuring safe operation of the system.

[0029] When the device receives the service braking electrical signal from the foot valve, the device's VCU calculates the signal and generates an analog signal to be output to the proportional pressure reducing valve, thereby controlling the output pressure of the proportional pressure reducing valve and thus controlling the service braking pressure.

[0030] When the device receives the parking brake release electrical signal from the parking brake switch, it calculates the parking brake release electrical signal through the device's VCU and generates a switching signal to be output to the solenoid ball valve 4, thereby controlling the opening and closing of the solenoid ball valve 4 and realizing the release of the parking brake.

[0031] When either of the two accumulators connected to ports A1 and A2 fails, the high-pressure selector valve 7 will cut off the oil circuit connected to the failed accumulator, ensuring that the other accumulator can work normally and ensuring the safety of the braking system.

[0032] Although the present invention has been disclosed above with reference to preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art can make various modifications and alterations without departing from the spirit and scope of the present invention. Therefore, the scope of protection of the present invention should be determined by the claims.

Claims

1. A brake-by-wire valve group for a patrol car, characterized by comprising: P port for high pressure oil supply, O port for auxiliary function oil outlet, A1 port and A2 port respectively connected to two accumulators, PB port connected to parking brake port, B port connected to service brake port; The line control brake valve group for the inspection vehicle further comprises a priority valve (2) and a pressure compensation valve (8) connected in sequence from the P port, wherein the pressure compensation valve (8) is controlled according to the pressure of the A1 port and the A2 port; a proportional pressure reducing valve connected to the B port, an electromagnetic ball valve (4) connected to the PB port, and a hand pump (5), wherein the opening and closing of the proportional pressure reducing valve is controlled by the signal of the foot brake connected to the service brake port, and the opening and closing of the electromagnetic ball valve (4) is controlled by the signal of the parking brake port.

2. The brake-by-wire valve set for a patrol car according to claim 1, wherein The A1 port and the A2 port are provided with a high pressure selection valve (7) connected to the priority valve (2) and the proportional pressure reducing valve, and the high pressure selection valve (7) can cut off the oil circuit connected to the failed accumulator.

3. The brake-by-wire valve set for a patrol car according to claim 2, wherein The high pressure selection valve (7) can compare the pressure of the accumulator connection port A1 with the pressure of the accumulator connection port A2, and when the pressure of the accumulator connection port A1 is greater than the pressure of the accumulator connection port A2, the high pressure selection valve (7) will cut off the oil circuit from the accumulator connection port A1 to the accumulator connection port A2.

4. The brake-by-wire valve set for a patrol car according to claim 1, wherein The proportional pressure reducing valve is a straight-through proportional pressure reducing valve.

5. The brake-by-wire valve set for a patrol car according to claim 1, wherein The electromagnetic ball valve (4) is provided with a pressure reducing valve (6).

6. The brake-by-wire valve set for a patrol car according to claim 1, wherein The priority valve (2) can preferentially provide high pressure oil from the P port to the high pressure selection valve (7), thereby providing for the A1 port and the A2 port, and when the pressure of the A1 port and the A2 port reaches a set value, the high pressure oil from the P port bypasses the priority valve (2) to the auxiliary function oil outlet O port.

7. The brake-by-wire valve set for a patrol car according to claim 6, wherein The pressure compensation valve (8) can detect the A1 port and the A2 port, and when the pressure of the A1 port and the A2 port reaches a set value, the pressure compensation valve (8) is opened, the high pressure oil of the pressure compensation valve (8) enters the control port of the priority valve (2), the valve core of the priority valve (2) is opened, and the high pressure oil from the P port bypasses the priority valve (2) to the auxiliary function oil outlet O port.

8. The brake-by-wire valve set for a patrol car according to claim 7, wherein The priority valve (2) is provided with an overflow valve (1).

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