CN221138043U - High-safety hydraulic braking system - Google Patents

Abstract

The utility model discloses a high-safety hydraulic braking system which comprises a main oil supply path, a braking oil path, a first oil pipe, a second oil pipe, a braking control valve and a double-path braking foot valve, wherein the main oil supply path is connected with the braking oil path through a first pressure reducing valve, the liquid inlet end of the braking control valve is connected with the braking oil path, the braking control valve is provided with two liquid outlet ends and is respectively connected with the first oil pipe and the second oil pipe, the double-path braking foot valve is arranged on the first oil pipe and the second oil pipe, the liquid outlet end of the first oil pipe is connected with a braking element on a front axle, and the liquid outlet end of the second oil pipe is connected with a braking element on a rear axle. Compared with the prior art, the hydraulic control system is used for replacing the pneumatic control braking system, so that the hydraulic control system is higher in stability, has a pipe explosion interlocking function, and further improves the safety of the braking system.

Description

High-safety hydraulic braking system

Technical Field

The utility model relates to the technical field of hydraulic systems, in particular to a high-safety hydraulic braking system.

Background

With the rapid development of the economy in China, the running braking safety of the excavator is particularly important; at present, the excavator mostly adopts pneumatic braking. However, the air is used as a transmission medium, and the potential safety hazard problem of braking failure caused by water icing occurs in the cold north due to the fact that the air contains moisture, so that the application range of the excavator is limited. The control stability of the gas is poor, and when the gas pressure is too high, the use requirement and the service life of the gas pressure pipe fitting are easily influenced; when the air pressure is too low, the braking effect is affected. Therefore, the existing excavator is poor in pneumatic braking stability and safety.

In view of the above, the present inventors have made intensive studies to solve the above problems, and have made the present application.

Disclosure of Invention

The utility model mainly aims to provide a high-safety hydraulic braking system, which adopts hydraulic pressure to replace a pneumatic control braking system, has stronger stability, has a pipe explosion interlocking function and further improves the safety of the braking system.

In order to achieve the above object, the solution of the present utility model is:

The utility model provides a high security's hydraulic braking system, includes main oil feed way, brake oil way, first oil pipe, second oil pipe, brake control valve and double-circuit brake foot valve, main oil feed way with be connected through first relief pressure valve between the brake oil way, brake control valve's feed liquor end with the brake oil way is connected, brake control valve has two liquid ends and is connected with first oil pipe and second oil pipe respectively, the double-circuit brake foot valve sets up on first oil pipe and second oil pipe, the liquid end of first oil pipe is connected with the braking element on the front axle, the liquid end of second oil pipe is connected with the braking element on the rear axle.

Further, the brake control valve comprises a first control end and a second control end, the first control end controls the brake control valve to be switched from an initial position to a first working position, the second control valve controls the brake control valve to be switched from the initial position to a second working position, when the brake control valve is in the initial position, a brake oil circuit is communicated with the first oil pipe and the second oil pipe, when the brake control valve is in the first working position, the brake oil circuit is communicated with the second oil pipe, the first oil pipe is blocked, when the brake control valve is in the second working position, the brake oil circuit is communicated with the first oil pipe, and the second oil pipe is blocked.

Further, the hydraulic control system further comprises a steering oil path and a pilot oil path, wherein the steering oil path is connected with the main oil supply path through a second pressure reducing valve, and the pilot oil path is connected with the main oil supply path through a third pressure reducing valve.

Furthermore, an accumulator and a liquid filling Ls oil way are arranged on the brake oil way, a liquid filling Ls valve is arranged on the liquid filling Ls oil way, and a throttle valve is arranged between the liquid outlet end of the first pressure reducing valve and the accumulator.

Further, the braking element is a disc brake.

Compared with the prior art, the hydraulic braking device has the beneficial effects that hydraulic pressure is adopted to replace a pneumatic control braking element, so that the hydraulic braking stability and reliability are better, the phenomenon of braking failure can be avoided, and the safety of a braking system is improved. In addition, the braking control valve can play the effect of pipe explosion interlocking, when first oil pipe or second oil pipe take place to explode the pipe or pressure release loses the braking ability, first control end and second control end can play the suggestion effect to switch the braking control valve to first station or second station, carry out the shutoff to the oil pipe of pipe explosion or pressure release, make another oil pipe can stabilize hydraulic pressure and normal work, avoid front axle and rear axle to lose the braking ability simultaneously, further improve the security performance of braking.

Drawings

FIG. 1 is a schematic view of an oil path structure according to the present utility model

In the figure:

A main oil supply path 11, a brake oil path 12, a first oil pipe 13, a second oil pipe 14,

Steering oil passage 15, pilot oil passage 16, liquid charge Ls oil passage 17, steering Ls oil passage 18, multiway valve Ls oil passage 19, brake control valve 2, first control end 21,

A second control end 22, a two-way brake foot valve 3, a first pressure reducing valve 41,

A second pressure reducing valve 42, a third pressure reducing valve 43, a front axle 51, a rear axle 52, an accumulator 6, a charging Ls valve 7, a throttle valve 8.

Detailed Description

In order to further explain the technical scheme of the utility model, the utility model is explained in detail by specific examples.

As shown in fig. 1, a high-safety hydraulic brake system comprises a main oil supply path 11, a brake oil path 12, a first oil pipe 13, a second oil pipe 14, a brake control valve 2 and a two-way brake foot valve 3, wherein a liquid supply pump is arranged at a liquid inlet end of the main oil supply path 11, and high-pressure oil is supplied to the main oil supply path 11 through the liquid supply pump. The main oil supply passage 11 and the brake oil passage 12 are connected by a first pressure reducing valve 41, and the high-pressure oil in the main oil supply passage 11 is reduced in pressure by the first pressure reducing valve 41 so that the oil pressure satisfies the pressure demand of the brake element. The liquid inlet end of the brake control valve 2 is connected with the brake oil way 12, the brake control valve 2 is provided with two liquid outlet ends and is respectively connected with the first oil pipe 13 and the second oil pipe 14, the two-way brake foot valve 3 is arranged on the first oil pipe 13 and the second oil pipe 14, the liquid outlet end of the first oil pipe 13 is connected with a brake element on the front axle 51, the liquid outlet end of the second oil pipe 14 is connected with a brake element on the rear axle 52, more specifically, the brake element can adopt disc brake, and the first oil pipe 13 and the second oil pipe 14 provide hydraulic pressure for the disc brake, so that a brake effect is realized. The two-way brake foot valve 3 is a conventional hydraulic control fitting capable of controlling the supply or release of pressure to the brake element. Compared with the prior art, the hydraulic braking device adopts hydraulic to replace pneumatic control braking elements, has better hydraulic braking stability and reliability, can avoid the phenomenon of braking failure, and improves the safety of a braking system. And the air circuit elements such as an air pump, an air storage tank, a brake valve, a quick release valve and the like can be omitted, so that the cost and the expense are further saved. In addition, the air circuit drives the air compressor by using a belt, and the air storage tank stores certain air pressure, but various air valves have poor tightness, so that the energy loss is large; the utility model adopts hydraulic energy supply, and the first pressure reducing valve 41 is used for reducing pressure, so that the energy is needed for taking the energy, the phenomenon of energy waste is avoided, and the energy-saving effect is achieved.

In this embodiment, the brake control valve 2 includes a first control end 21 and a second control end 22, the first control end 21 and the second control end 22 may be provided with a pressure or spool displacement signal switch, the first control end 21 controls the brake control valve 2 to switch from an initial position to a first operating position, the second control valve controls the brake control valve 2 to switch from the initial position to a second operating position, when the brake control valve 2 is in the initial position, the brake oil path 12 is communicated with both the first oil pipe 13 and the second oil pipe 14, when the brake control valve 2 is in the first operating position, the brake oil path 12 is communicated with the second oil pipe 14, the first oil pipe 13 is blocked, and when the brake control valve 2 is in the second position, the brake oil path 12 is communicated with the first oil pipe 13, and the second oil pipe 14 is blocked.

During normal operation, the brake control valve 2 is located at an initial position, and at this time, the brake oil path 12 is communicated with the first oil pipe 13 and the second oil pipe 14, so as to provide stable hydraulic pressure for the brake elements of the front axle 52 and the rear axle 52, and the front axle 51 and the rear axle 52 are normally braked through the two-way brake foot valve 3. When the first oil pipe 13 is burst or pressure release and braking capability is lost, the first control end 21 senses oil pressure in the first oil pipe 13 and sends prompt and signal feedback, at the moment, the brake control valve 2 is switched to the first station, the liquid inlet end of the first oil pipe 13 is blocked by the brake control valve 2, the brake oil way 12 is normally communicated with the second oil pipe 14, pressure stability in the second oil pipe 14 is ensured, and the rear axle 52 can always maintain good braking performance. On the contrary, when the second oil pipe 14 is burst or pressure release and braking capability is lost, the second control end 22 senses oil pressure in the second oil pipe 14 and sends prompt and signal feedback, at the moment, the brake control valve 2 is switched to the second station, the liquid inlet end of the second oil pipe 14 is blocked by the brake control valve 2, the brake oil way 12 is normally communicated with the first oil pipe 13, pressure stability in the first oil pipe 13 is ensured, and the front axle 51 can always maintain good braking performance. Compared with the prior art, the utility model can play a role in pipe explosion interlocking, when the first oil pipe 13 or the second oil pipe 14 is subjected to pipe explosion or pressure relief and the braking capability is lost, the first control end 21 and the second control end 22 can play a role in prompting, the braking control valve 2 is switched to the first station or the second station, the pipe explosion or pressure relief is blocked, the other oil pipe can stably and normally work, the front axle 51 and the rear axle 52 are prevented from losing the braking capability at the same time, and the braking safety performance is further improved.

Preferably, the hydraulic brake system further includes a steering oil passage 15 and a pilot oil passage 16, wherein the steering oil passage 15 is connected to the main oil supply passage 11 through a second pressure reducing valve 42, and the pilot oil passage 16 is connected to the main oil supply passage 11 through a third pressure reducing valve 43. Wherein the liquid outlet end pressure of the second pressure reducing valve 42 is larger than the liquid outlet end pressure of the first pressure reducing valve 41, and the liquid outlet end pressure of the first pressure reducing valve 41 is larger than the liquid outlet end pressure of the third pressure reducing valve 43. This novel hydraulic braking system combines brake oil circuit 12, steering oil circuit 15 and guide oil circuit 16 integration for whole hydraulic system structure is succinct compact more, makes things convenient for the system to carry out structural arrangement. The brake oil passage 12 is provided with an accumulator 6 and a liquid charge Ls oil passage 17, the liquid charge Ls oil passage 17 is provided with a liquid charge Ls valve 7, and a throttle valve 8 is arranged between the liquid outlet end of the first pressure reducing valve 41 and the accumulator 6. In operation, when the pressure of the accumulator 6 is lower than the spring pressure set in the liquid charging Ls valve 7, the oil pressure of the brake oil passage 12 is transferred to the liquid charging Ls oil passage 17, the system selects the maximum oil pressure from the liquid charging Ls oil passage 17, the steering Ls oil passage 18 and the multi-way valve Ls oil passage 19 to feed back to the liquid supply pump, so that the liquid supply pump starts to supply oil, wherein the steering Ls oil passage 18 is connected with the steering oil passage 15, and the multi-way valve Ls oil passage 19 is connected with the multi-way valve oil passage. That is, when the pressure of the accumulator 6 is lower than the outlet pressure set by the first pressure reducing valve 41, the pressure of the brake oil path 12 is directly transmitted to the liquid charging Ls oil path 17, at this time, the liquid supply pump starts to increase the discharge capacity, the accumulator 6 charges, and the throttle valve 8 is arranged between the outlet end of the first pressure reducing valve 41 and the accumulator 6, so that the pressure is full with time lag, and the purpose of full energy storage is achieved. Then, when the pressure of the accumulator 6 is higher than the spring pressure set in the liquid charge Ls valve 7, the liquid charge Ls valve 7 blocks the liquid charge Ls oil passage 17.

The above examples and drawings are not intended to limit the form or form of the present utility model, and any suitable variations or modifications thereof by those skilled in the art should be construed as not departing from the scope of the present utility model.

Claims (5)

1. The utility model provides a high security's hydraulic braking system, its characterized in that includes main oil feed way, brake oil way, first oil pipe, second oil pipe, brake control valve and double-circuit brake foot valve, main oil feed way with be connected through first relief pressure valve between the brake oil way, brake control valve's feed liquor end with the brake oil way is connected, brake control valve has two liquid ends and is connected with first oil pipe and second oil pipe respectively, double-circuit brake foot valve sets up on first oil pipe and second oil pipe, the liquid end of first oil pipe is connected with the braking component on the front axle, the liquid end of second oil pipe is connected with the braking component on the rear axle.

2. The high safety hydraulic brake system of claim 1 wherein the brake control valve includes a first control end and a second control end, the first control end controlling the brake control valve to switch from the initial position to the first operating position, the second control end controlling the brake control valve to switch from the initial position to the second operating position, the brake fluid passage communicating with both the first fluid passage and the second fluid passage when the brake control valve is in the initial position, the brake fluid passage communicating with the second fluid passage when the brake control valve is in the first operating position, the first fluid passage being blocked, the brake fluid passage communicating with the first fluid passage when the brake control valve is in the second position, the second fluid passage being blocked.

3. A high-safety hydraulic brake system according to claim 2, further comprising a steering oil passage connected to the main oil supply passage through a second pressure reducing valve and a pilot oil passage connected to the main oil supply passage through a third pressure reducing valve.

4. A high safety hydraulic brake system according to claim 3, wherein the brake oil path is provided with an accumulator and a liquid Ls-filled oil path, the liquid Ls-filled oil path is provided with a liquid Ls valve, and a throttle valve is arranged between the liquid outlet end of the first pressure reducing valve and the accumulator.

5. A high safety hydraulic brake system according to claim 1 wherein the brake element is a disc brake.