1. A parking brake release system, comprising:

a parking brake (2) comprising a parking brake oil chamber (210) and a brake oil chamber (220);

a piston rod (211) is arranged in the parking brake oil chamber (210), the piston rod (211) divides the parking brake oil chamber (210) into a rod chamber and a rodless chamber, a pressure spring (212) is arranged in the rodless chamber, and the pressure spring (212) is connected with the piston rod (211);

the main control oil path (1) is connected with 2 hydraulic pipes at the outlet end, wherein one hydraulic pipe is connected with the brake oil chamber (220), the other hydraulic pipe is connected with an oil inlet V1 of the shuttle valve (4), and the oil outlet of the shuttle valve (4) is connected with the rod chamber of the parking brake oil chamber (210);

the manual pumping device (3) is detachably connected to one end of the transition valve block (5), and the other end of the transition valve block (5) is connected with the oil inlet V2 of the shuttle valve (4) so that the manual pumping device (3) is communicated with the rod cavity;

the manual pumping device (3) is adapted to pump and/or unload hydraulic oil to the rod chamber.

2. Parking brake release system according to claim 1, characterized in that the manual pumping device (3) is connected with the transition valve block (5) by a connecting joint (6);

the connection joint (6) comprises a male end (610) and a female end (620), the male end (610)/the female end (620) are arranged on the transition valve block (5), and the female end (620)/the male end (610) are arranged on the manual pump (3);

the male end (610) is in threaded connection with the female end (620).

3. Parking brake release system according to claim 2, wherein a first one-way valve (611) is provided in the male end (610) and a second one-way valve (621) is provided in the female end (620);

when the male end (611) is connected with the female end (5621), the first check valve (611) is elastically abutted with a valve core of the second check valve (621) so that the manual pumping device (3) is communicated with the rod chamber of the parking brake oil chamber (210).

4. Parking brake release system according to claim 2, characterized in that the manual pumping means (3) comprises a manual pump (320) and an oil tank (310);

the inlet end of the manual pump (320) is connected to the oil tank (310), and the outlet end of the manual pump is connected with the female end (620)/the male end (610) of the connecting joint (56);

and a third one-way valve (330) is further arranged between the female end (620)/the male end (610) and the manual pump (320), and hydraulic oil in the oil tank (310) can be pumped out by pressing the manual pump (320).

5. Parking brake release system according to claim 4, characterized in that the manual pumping means (3) further comprises an unloading valve (350);

the unloading valve (350) is connected with the third one-way valve (330) and the manual pump (320) in parallel and used for unloading the hydraulic oil in the parking brake oil chamber (210) and the rod chamber.

6. Parking brake release system according to claim 4, wherein the manual pumping means (3) further comprises a pressure gauge (340);

the pressure gauge (340) is arranged between the third one-way valve (330) and the female end (620)/the male end (610) and used for detecting the outlet pressure of the manual pump (320).

7. A construction machine vehicle, characterized by comprising:

a wheel;

a brake pad (7);

the parking brake release system according to any one of claims 1 to 6;

the brake pad (7) is arranged at the end part of the piston rod (211) and can be in friction contact with and/or separated from the wheel under the driving of the piston rod (211);

when the friction between the brake pad (7) and the wheel is released, the wheel is parked and braked;

when the brake pad (7) is out of frictional contact with the wheel, the wheel releases the parking brake.

8. A parking brake releasing method for an engineering machinery vehicle is characterized by comprising the following steps:

communicating a manual pumping device with a parking brake oil chamber;

and controlling the manual pumping device to start and releasing the parking brake.

9. The method for releasing parking brake of engineering machinery vehicle according to claim 8, wherein the controlling the manual pumping device to start and releasing parking brake specifically comprises:

pressing the manual pump, and stopping pressing the manual pump when the pressure value displayed by the pressure gauge exceeds the parking release pressure, so that the parking brake is released;

and when the engineering machinery vehicle moves to a specified position, the unloading valve is controlled to be started, and the parking brake is recovered.

10. The method for releasing parking brake of construction machinery vehicle according to claim 9, further comprising half parking brake release:

and controlling the unloading valve to start, and unloading the hydraulic oil part in the parking brake oil cavity to enable the engineering mechanical vehicle to be in a semi-active release state.

Background

Mine cars are important transportation vehicles in strip mining, and the possibility of failure is very high due to the severe operating environment. When the mining wide-body vehicle breaks down in the operation process, particularly when the vehicle cannot be started, the broken-down vehicle needs to be transported to a specified place for repair in order to not influence the continuous operation of the work. However, once the vehicle cannot be started, which means that the parking brake function of the vehicle is turned on, the rear wheels of the vehicle are locked by the brakes. After the brake is locked, the mine vehicle is a large-tonnage mechanical product, so that the trailer is extremely difficult to pull, and the tire is damaged if the trailer is forced. Other hydraulically braked engineering machinery vehicles also have similar problems as mining vehicles, such as loaders, road rollers and the like.

The existing parking brake release system is mostly arranged on a main control oil way, and if the main control oil way breaks down, the parking brake release can not be realized. When the fault vehicle is dragged to a specified position, the vehicle is prevented from sliding for safety, the parking brake is required to be recovered, and the parking brake cannot be recovered after the parking brake of the existing parking brake removing system is removed, so that potential safety hazards exist.

Disclosure of Invention

Technical problem to be solved

In view of the above disadvantages and shortcomings of the prior art, the invention provides a parking brake release system, an engineering machinery vehicle and a parking brake release method, which realize parking brake release and parking active recovery through a manual pumping device, and solve the problem that the parking brake release system needs to be arranged on a main control oil path, and the parking brake release cannot be realized when a main controller oil path fails in the prior art.

(II) technical scheme

In order to achieve the purpose, the invention provides a parking brake release system, an engineering mechanical vehicle and a parking brake release method, and the specific technical scheme is as follows:

a parking brake release system comprising:

the parking brake comprises a parking brake oil cavity and a brake oil cavity;

a piston rod is arranged in the parking brake oil cavity, the parking brake oil cavity is divided into a rod cavity and a rodless cavity by the piston rod, a pressure spring is arranged in the rodless cavity, and the pressure spring is connected with the piston rod;

the main control oil path, the exit end connects with 2 hydraulic pipes, one of which connects with the brake oil chamber, the other connects with the shuttle valve oil inlet V1, the oil outlet of the shuttle valve connects with the rod chamber of the parking brake oil chamber;

the manual pumping device is detachably connected to one end of the transition valve block, and the other end of the transition valve block is connected with the oil inlet V2 of the shuttle valve, so that the manual pumping device is communicated with the rod cavity;

the manual pumping device is adapted to pump and/or unload hydraulic oil to the rod chamber.

Further, the manual pumping device is connected with the transition valve block through a connecting joint;

the connecting joint comprises a male end and a female end, the male end is arranged on the transition valve block, and the female end is arranged on the manual pumping device;

the male end is in threaded connection with the female end.

Furthermore, a first one-way valve is arranged in the male end, and a second one-way valve is arranged in the female end;

when the male end is connected with the female end, the valve core of the first one-way valve is elastically abutted against the valve core of the second one-way valve, so that the manual pumping device is communicated with the parking brake oil cavity through the shuttle valve.

Further, the manual pumping device comprises a manual pump and an oil tank;

the inlet end of the manual pump is connected to the oil tank, and the outlet end of the manual pump is connected with the female end of the connecting joint;

still be provided with the third check valve between female end and the manual pump, press the manual pump, can pump the hydraulic oil in the oil tank.

Further, the manual pumping device also comprises an unloading valve;

the unloading valve is connected with the third one-way valve and the manual pump in parallel and is used for unloading the hydraulic oil in the rod cavity of the parking brake oil cavity

Further, the manual pumping device also comprises a pressure gauge;

the manometer is located between third check valve and the female end for detect manual pump export pressure.

A work machine vehicle comprising:

a wheel;

a brake pad;

the parking brake release system;

the brake pad is arranged at the end part of the piston rod and can be in friction contact with and/or separated from the wheel under the driving of the piston rod;

when the friction between the brake pad and the wheel is removed, the wheel is parked and braked;

when the brake pads are out of frictional contact with the wheel, the wheel releases the parking brake.

A parking brake releasing method for an engineering machinery vehicle comprises the following steps:

communicating a manual pumping device with a parking brake oil chamber;

controlling the manual pumping device to start and releasing the parking brake;

further, control manual pumping unit and start, remove parking brake, specifically include:

pressing the manual pump, and stopping pressing the manual pump when the pressure value displayed by the pressure gauge exceeds the parking release pressure, so that the parking brake is released;

and when the engineering machinery vehicle moves to a specified position, the unloading valve is controlled to be started, and the parking brake is recovered.

Further, the method also comprises the following steps of releasing the semi-parking brake:

and controlling the unloading valve to start, and unloading the hydraulic oil part in the parking brake oil cavity to enable the engineering mechanical vehicle to be in a semi-active release state.

(III) advantageous effects

The parking brake release system, the engineering machinery vehicle and the parking brake release method effectively overcome the defects in the prior art.

According to the invention, the manual pumping device is detachably connected to the shuttle valve of the main control oil way through the transition valve block by arranging the manual pumping device. When the parking brake of the fault vehicle needs to be released, the manual pumping device is pressed to pump hydraulic oil into the parking brake oil cavity, and when the oil pressure of the hydraulic oil exceeds the parking brake release pressure, the parking brake releases the brake. After the fault car is transferred to the designated position, for the sake of safety, the parking brake of the fault car is recovered through the manual pumping device, and the potential safety hazard caused by the movement of the fault car can be avoided during repair. According to the invention, the manual pumping device and the main control oil way are independently arranged, so that the problem that the parking brake cannot be released due to the damage of the main control oil way is effectively avoided.

Drawings

The accompanying drawings, which are included to provide a further understanding of the application and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the application and together with the description serve to explain the application and not to limit the application, and in which:

FIG. 1 is a schematic diagram of a parking brake release system in an embodiment;

FIG. 2 is a schematic structural diagram of a magnetic scale manual pumping device in an embodiment;

fig. 3 is a schematic structural view of a connection joint in an embodiment.

[ description of reference ]

1. A main control oil way;

2. a parking brake;

210. a parking brake oil chamber; 211. a piston rod; 212. a pressure spring;

220. a brake oil chamber;

3. a manual pumping device; 310. an oil tank; 320. a manual pump; 330. a third check valve; 340. a pressure gauge; 350. an unloading valve;

4. a shuttle valve; 5. a transition valve block;

6. connecting a joint;

610. a male end; 611. a first check valve;

620. a female end; 621. a second unidirectional;

7. a brake pad.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention clearer, the technical solutions in the embodiments of the present invention will be described in more detail below with reference to the accompanying drawings in the preferred embodiments of the present invention. In the drawings, the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The described embodiments are only some, but not all embodiments of the invention. The embodiments described below with reference to the drawings are illustrative and intended to be illustrative of the invention and are not to be construed as limiting the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention. Embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

In the description of the present embodiment, it is to be understood that the terms "center", "longitudinal", "lateral", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplicity of description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed in a particular orientation, and be operated, and therefore, should not be construed as limiting the scope of the present embodiment.

Referring to fig. 1 to 3, the present embodiment provides a parking brake release system including a parking brake 2, a main control oil passage 1, and a manual pumping device 3.

Specifically, parking brake 2 includes a parking brake oil chamber 210 and a brake oil chamber 220, a piston rod 211 is disposed in parking brake oil chamber 210, piston rod 211 divides parking brake oil chamber 210 into a rod chamber and a rodless chamber, a compression spring 212 is disposed in the rodless chamber, and a brake pad 7 is disposed at an end of piston rod 211. The outlet end of the main control oil path 1 is provided with 2 hydraulic pipes, wherein one hydraulic pipe is communicated with the brake oil chamber 220, the other hydraulic pipe is connected with an oil inlet V1 of the shuttle valve 4, and an oil outlet of the shuttle valve 4 is connected with a rod chamber of the parking brake oil chamber 210. The manual pumping device 3 is connected with the shuttle valve 4 oil inlet V2 through the transition valve block 5, and the manual pumping device 3 is suitable for pumping hydraulic oil to the rod cavity of the parking brake oil cavity 210 and unloading the hydraulic oil in the rod cavity. The shuttle valve 4 functions as: and the pressure oil of the main control oil circuit 1 is isolated when the parking brake is released, and the hydraulic oil pumped by the manual pumping device 3 is isolated when the parking brake is recovered.

When the automobile is normally driven, the rod cavity of the parking brake oil cavity 210 is filled with high-pressure oil, the high-pressure oil pushes the piston rod 211 to move towards the direction of the rodless cavity, the brake pad 7 is driven to move towards the direction far away from the wheel, and the pressure spring 212 is compressed. When braking is needed, the main control oil path 1 injects hydraulic oil into the brake oil cavity 220 to push the brake pad to be in frictional contact with the wheel for braking. When parking braking is needed, high-pressure oil in the rod cavity of the parking braking oil cavity 210 is discharged, the pressure spring pushes the piston rod 211 to move towards the rod cavity, and the brake pad 7 locks the wheels, so that parking braking is achieved. If the vehicle fails and cannot be started, the manual pumping device 3 is pressed, high-pressure oil is pumped into the rod cavity of the parking brake oil cavity 210, the high-pressure oil pushes the piston rod 211 to move towards the direction of the rodless cavity, the brake pad 7 is separated from the wheel, parking brake is released, the failed vehicle is transferred to a specified position, then the high-pressure oil in the rod cavity is discharged through the manual pumping device 3, and the failed vehicle recovers parking brake.

Further, the manual pumping device 3 is connected to the transition valve block 5 by a connector fitting 6, the connector fitting 6 comprising a male end 610 and a female end 620. Wherein, male end 610 adopts the welded mode to be fixed in on the transition valve piece 5, and female end 620 is located on manual pumping device 3, male end 610 and female end 620 threaded connection. In this embodiment, the positions of the male end 610 and the female end 620 are not limited, and the female end 620 may be disposed on the transition valve block 5, and the male end 610 may be disposed on the manual pumping device 3. Further, a first one-way valve 611 is arranged in the male end 610, a second one-way valve 621 is arranged in the female end 620, and the first one-way valve 611 and the second one-way valve 621 have one-way conductivity, so that the hydraulic oil in the main control oil path 1 and the manual pumping device 3 can be prevented from overflowing. When the male end 610 and the female end 620 of the connection joint 6 are connected, the valve bodies of the first check valve 611 and the second check valve 621 elastically abut, and the connection joint 6 is put into a communication state. In this embodiment, the transition valve block 5 is disposed in the cab, the manual pumping device 3 is separately stored, and when the parking brake needs to be released, the female end 620 of the manual pumping device 3 is in threaded connection with the male end 610 of the transition valve block 5. The manual pumping device 3 is connected with the shuttle valve 4 of the main control oil circuit 1 through the connecting joint 6, and is very convenient and fast.

Specifically, referring to fig. 2, the manual pumping device 3 in the present embodiment includes a manual pump 320 and an oil tank 310, an inlet of the manual pump 320 is connected to the oil tank 310, an outlet of the manual pump 320 is connected to a female end 620 of the connection joint 6, a third check valve 330 is disposed between the manual pump 320 and the connection joint 6, hydraulic oil in the oil tank 310 can be pumped into a rod chamber of the parking brake oil chamber 6 by pressing the manual pump 320, and the third check valve 330 is used for preventing the hydraulic oil from flowing back. Further, a pressure gauge 340 is disposed between the manual pump 320 and the third check valve 330 for monitoring the outlet pressure of the manual pump 320 in real time. When the pressure-relief device is used specifically, when the outlet pressure of the manual pump 320 is monitored to be larger than the parking brake release pressure, the manual pump 320 is stopped being pressed, the parking brake is released, and the phenomenon that the pressure spring 212 is compressed in a transition mode due to the fact that the manual pump 320 is continuously pressed to influence the service life of the pressure spring 212 is avoided. Further, the manual pumping device 3 further comprises an unloading valve 350, the unloading valve 350 is arranged in parallel with the third one-way valve 330 and the manual pump 320, and the operation of the unloading valve 350 can unload the high-pressure oil in the rod cavity of the parking brake oil chamber 6 so as to restore the parking brake. If dangerous road conditions are met in the process of towing a vehicle with a fault, when semi-parking braking is required to be relieved, high-pressure oil in a rod cavity can be properly discharged by operating the unloading valve 350, and the wheels are in a semi-braking state, so that slow traveling of the vehicle is realized, the safety of the towing process is ensured, and potential safety hazards are effectively avoided.

The aforesaid is the concrete structure of the parking braking system of removing that this embodiment provided, and manual pumping installations 3 links to each other with shuttle valve 4 through attach fitting 6, and manual pumping installations 3 and main control oil circuit 1 mutual independence can realize through manual pumping installations 3 that parking braking is removed, parking braking resumes and half parking braking, have realized smooth trailer, have guaranteed the security of trailer process simultaneously, and the parking braking system of removing that this implementation provided's structure is comparatively simple, low in manufacturing cost.

Based on the specific structure of the parking brake release system, the embodiment further provides an engineering machinery vehicle, the parking brake release system is adopted, and meanwhile, a parking brake release method is further provided, and the parking brake release method comprises the following steps:

1) the manual pumping device 3 is communicated with the parking brake oil chamber 210;

the male end 610 and the female end 620 of the connector 6 are threadedly connected, and the manual pumping device 3 communicates with the rod chamber of the parking brake oil chamber 210.

2) Releasing the parking brake;

pressing the manual pump 320, pumping hydraulic oil to the rod cavity of the parking brake oil cavity 210, and stopping pressing the manual pump 320 to release the parking brake when the oil pressure displayed by the pressure gauge 340 exceeds the parking brake release pressure;

3) recovering the parking brake;

after the engineering machinery vehicle is dragged to a specified position, the unloading valve 350 is operated, high-pressure oil in the rod cavity of the parking brake oil cavity 210 is unloaded, and the parking brake is recovered.

4) And half parking brake release:

in the process of towing, when the vehicle passes through a dangerous road condition section, the unloading valve 350 is operated, and part of high-pressure oil in the rod cavity of the parking brake oil cavity 210 is unloaded, so that the wheel is in a semi-braking state, and the vehicle can safely run.

The above is only a preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can substitute or change the technical solution of the present invention and the inventive concept within the technical scope of the present invention.