CN210191449U - Slippage anti-misoperation parking brake hydraulic system - Google Patents
Slippage anti-misoperation parking brake hydraulic system Download PDFInfo
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- CN210191449U CN210191449U CN201920991417.7U CN201920991417U CN210191449U CN 210191449 U CN210191449 U CN 210191449U CN 201920991417 U CN201920991417 U CN 201920991417U CN 210191449 U CN210191449 U CN 210191449U
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- electromagnetic directional
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- 238000000034 method Methods 0.000 claims abstract description 6
- 239000003921 oil Substances 0.000 claims description 60
- 239000010720 hydraulic oil Substances 0.000 claims description 15
- 230000002265 prevention Effects 0.000 abstract description 3
- 238000005034 decoration Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
- 239000010705 motor oil Substances 0.000 description 1
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- Valves And Accessory Devices For Braking Systems (AREA)
Abstract
The utility model discloses a prevent maloperation parking braking hydraulic system and control method thereof slides belongs to engineering machine tool and industrial vehicle technical field. The oil outlet of the hydraulic pump is connected with the electromagnetic directional valve I and the pilot valve; the electromagnetic directional valve I is connected to brakes in the hydraulic motor I and the hydraulic motor II; the pilot valve is connected to the plunger pump; an electromagnetic directional valve II is arranged in an oil path between the hydraulic pump and the pilot valve; a pressure switch and a shuttle valve set are installed in an oil path between the pilot valve and the plunger pump, the shuttle valve set screens the highest pressure from the pilot valve and transmits the highest pressure to the pressure switch, and the pressure switch controls whether the electromagnetic directional valve I is electrified or not. When the safety device is not prepared, no pressure is output even if the pilot valve is operated by mistake, the whole vehicle keeps the original state, and misoperation prevention is realized; when the safety device finishes preparation, no matter whether the pilot valve is operated before, as long as the pilot valve is stopped to be operated, the vehicle keeps braking until the pilot valve is operated again by a driver, and parking braking is realized.
Description
Technical Field
The utility model relates to a parking braking hydraulic system specifically is a prevent maloperation parking braking hydraulic system and control method thereof slides, belongs to engineering machine tool and industrial vehicle technical field.
Background
The skid steer loader is a wheel type special chassis device which realizes vehicle steering by utilizing linear velocity difference of wheels at two sides. The device is mainly used for occasions with narrow operation places, uneven ground and frequent operation content change.
The skid steer loader mostly adopts a pilot-controlled closed hydraulic system for walking, and as shown in fig. 1, the hydraulic system comprises a plunger pump, a hydraulic motor and a pilot valve. The parking brake is applied by a brake in the hydraulic motor. The control logic is as follows:
when the vehicle is started and the safety measure is not prepared, the electromagnetic directional valve I4 is not electrified and is in an initial position, at the moment, the gear pump 1 supplies oil to the oil inlet of the pilot valve 7 and overflows through the overflow valve, no hydraulic oil flows into a Z5 braking port of the hydraulic motor I5 and a Z10 braking port of the hydraulic motor II 10, and the brake brakes the whole vehicle and cannot walk;
when the vehicle is started and safety measures are prepared, the electromagnetic directional valve I4 is electrified, the valve core moves leftwards and is located at a working position, the gear pump 1 supplies oil to a Z5 braking port of the hydraulic motor I5, a P7 oil inlet of the pilot valve 7 and a Z10 braking port of the hydraulic motor II 10 through the electromagnetic directional valve I4, brakes of the two hydraulic motors are opened, and at the moment, the skid-steer loader can walk.
In practice, this system has two disadvantages:
firstly, if the skid-steer loader is stopped on a road surface with a slope, once the safety measures are prepared, the brake of the hydraulic motor is opened, and the vehicle has the danger of sliding and landslide;
second, no matter whether the safeguard measure is ready to finish, gear pump 1 all can be to the fuel feeding of 7 oil inlets of pilot valve, touch pilot valve 7 like the mistake this moment, then hydraulic oil arrives plunger pump 2 control ports through 7 working ports of pilot valve, thereby change the output discharge capacity of plunger pump 2, plunger pump 2 will be simultaneously to hydraulic motor 5 and the oil feeding of hydraulic motor 10, the pressure is established to the walking hydraulic system, hydraulic motor has the motion trend, if walking motor brake leads to braking torque not enough because of reasons such as wearing and tearing, the whole car then can appear walking phenomenon, seriously influence the safe operation of equipment and can cause the personal safety accident even.
Disclosure of Invention
In order to solve the technical problem, the utility model provides a prevent maloperation parking braking hydraulic system and control method slides makes hydraulic system have the function of preventing maloperation under the condition that does not change the operation.
The utility model adopts the technical proposal that: a parking brake hydraulic system capable of preventing misoperation in sliding comprises a plunger pump, a hydraulic motor I and a hydraulic motor II, wherein brakes are arranged in the hydraulic motor I and the hydraulic motor II; the oil outlet of the hydraulic pump is respectively connected with an electromagnetic directional valve I and a pilot valve; the oil outlet of the electromagnetic reversing valve I is respectively connected to brakes in the hydraulic motor I and the hydraulic motor II; the pilot valve oil outlet is connected to the plunger pump;
an electromagnetic directional valve II is arranged in an oil path between the hydraulic pump and the pilot valve;
and a pressure switch is arranged in an oil path between the pilot valve and the plunger pump, and the pressure switch controls whether the electromagnetic directional valve I is electrified or not.
It further comprises the following steps: the oil ports A7, B7, C7 and D7 of the pilot valve are respectively connected with the control port of the plunger pump through a shuttle valve group, the port A9 of the shuttle valve group is connected with a pressure switch, and the shuttle valve group screens the highest pressure from the pilot valve and transmits the highest pressure to the pressure switch.
And an oil outlet of the hydraulic pump is connected with an overflow valve.
An oil inlet P4 of the electromagnetic directional valve I is connected with an oil outlet of the hydraulic pump, and an oil outlet A4 of the electromagnetic directional valve I is respectively connected with a braking port Z5 of a brake in the hydraulic motor I and a braking port Z10 of a brake in the hydraulic motor II.
And an oil port T4 of the electromagnetic directional valve I, an oil drainage port L5 of an oil port of the hydraulic motor, an oil port T6 of the electromagnetic directional valve II, an oil port T7 of the pilot valve and an oil drainage port L10 of the hydraulic motor II are all connected with the hydraulic oil tank.
A control method for a slip misoperation prevention parking brake hydraulic system comprises the following steps:
when the vehicle is started and the insurance measure is not prepared;
the electromagnetic directional valve II is not electrified and is in an initial position; the pilot valve has no inflow of hydraulic oil, cannot build pressure and is not opened; the electromagnetic directional valve I is not electrified and is in an initial position;
at the moment, the gear pump overflows through an overflow valve, no hydraulic oil flows into a braking port Z5 of the hydraulic motor I and a braking port Z10 of the hydraulic motor II, and the whole vehicle is braked;
starting the vehicle, and preparing insurance measures;
the electromagnetic directional valve II is electrified, and a valve core of the electromagnetic directional valve II moves leftwards and is in a working position;
the hydraulic pump supplies oil to the pilot valve;
when a pilot valve is operated by a driver, pressure is built in two of the oil ports A7, B7, C7 and D7, the shuttle valve group transmits the pressure to the pressure switch, and the pressure switch is opened and controls the electromagnetic reversing valve I to reverse;
the valve core of the electromagnetic directional valve moves left and is in a working position;
the hydraulic pump supplies oil to a brake port Z5 of the hydraulic motor I and a brake port Z10 of the hydraulic motor II through the electromagnetic directional valve I, brakes in the hydraulic motor I and the hydraulic motor II are opened, and at the moment, the skid steer loader can walk.
Compared with the prior art, the beneficial effects of the utility model are that:
when a vehicle is started and the safety device is not prepared, hydraulic oil output by a hydraulic pump is blocked by an electromagnetic directional valve II and overflows through an overflow valve, no hydraulic oil flows into an oil inlet of a pilot valve, no pressure is built, no pressure is output even if the pilot valve is operated by mistake, the whole vehicle is kept in an original state, and the function of preventing misoperation is realized;
when the vehicle is started and the safety device is prepared, no matter whether the pilot valve is operated before, the pilot valve is only required to be stopped to be operated, namely, no pressure output exists in the oil ports of the pilot valves A7, B7, C7 and D7, the pressure switch cannot be opened, the electromagnetic directional valve I is located at the initial position, no hydraulic oil flows into the braking port Z5 of the hydraulic motor I and the braking port Z10 of the hydraulic motor II, the vehicle keeps braking until the pilot valve is operated again by a driver, and the parking braking function is realized.
Drawings
FIG. 1 is a schematic diagram of a prior art skid hydraulic system;
FIG. 2 is a schematic diagram of the system of the present invention;
in the figure: the hydraulic control system comprises a hydraulic pump 1, a plunger pump 2, an overflow valve 3, an electromagnetic directional valve I4, a hydraulic motor I5, an electromagnetic directional valve II 6, a pilot valve 7, a pressure switch 8, a shuttle valve group 9, a hydraulic motor II 10 and a hydraulic oil tank 11.
Detailed Description
The following is a specific embodiment of the present invention, which will be further described with reference to the accompanying drawings.
Example one
Referring to fig. 2, an oil outlet of a hydraulic pump 1 is connected with an overflow valve 3, an oil inlet P4 of an electromagnetic directional valve i 4 and an oil inlet P6 of an electromagnetic directional valve ii 6 respectively. An oil outlet A4 of the electromagnetic directional valve I4 is respectively connected with a brake port Z5 of a brake in the hydraulic motor I5 and a brake port Z10 of a brake in the hydraulic motor II 10. An oil outlet A6 of the electromagnetic directional valve II 6 is connected with an oil inlet P7 of the pilot valve 7, and oil outlets A7, B7, C7 and D7 of the pilot valve 7 are respectively connected with a control port of the plunger pump 2 through a shuttle valve group. The pressure switch 8 is connected with a port A9 of the shuttle valve group, and the pressure switch 8 controls whether the electromagnetic directional valve I4 is electrified or not. The plunger pump 2 is connected with a hydraulic motor I5 and a hydraulic motor II 10. An oil port T4 of the electromagnetic directional valve I4, an oil drainage port L5 of the hydraulic motor oil port 5, an oil port T6 of the electromagnetic directional valve II 6, an oil port T7 of the pilot valve 7 and an oil drainage port L10 of the hydraulic motor II 10 are all connected with the hydraulic oil tank 11.
Example two
On the basis of the first embodiment, the control method of the slip misoperation prevention parking brake hydraulic system comprises the following steps:
when the vehicle is started and the insurance measure is not prepared;
the electromagnetic directional valve II 6 is not electrified and is in an initial position; the pilot valve 7 has no hydraulic oil flowing in, pressure cannot be built, the pressure switch 8 is not opened, the electromagnetic directional valve I4 is not electrified and is in an initial position;
at the moment, hydraulic oil output by the gear pump 1 overflows through the overflow valve 3, no hydraulic oil flows into a braking port Z5 of the hydraulic motor I5 and a braking port Z10 of the hydraulic motor II 10, and the brake brakes the whole vehicle and cannot walk;
at the moment, even if the pilot valve is operated by mistake, no pressure is output, the whole vehicle is kept in the original state, and the function of preventing misoperation is realized.
Starting the vehicle, and preparing insurance measures;
the electromagnetic directional valve II 6 is electrified, and the valve core of the electromagnetic directional valve II 6 moves leftwards and is in a working position;
the hydraulic pump 1 supplies oil to the pilot valve 7;
when a driver operates the pilot valve 7, two of the oil ports A7, B7, C7 and D7 establish pressure, the shuttle valve group 9 transmits the pressure to the pressure switch 8, and the pressure switch 8 is opened and controls the electromagnetic reversing valve I4 to reverse;
a valve core of the electromagnetic directional valve 4 moves left and is in a working position;
the hydraulic pump 1 supplies oil to a brake port Z5 of a hydraulic motor I5 and a brake port Z10 of a hydraulic motor II 10 through an electromagnetic directional valve I4, brakes in the hydraulic motor I5 and the hydraulic motor II 10 are opened, and at the moment, the skid-steer loader can walk;
and no matter whether the pilot valve is operated before, as long as the pilot valve 7 is stopped to be operated, namely, no pressure output exists at the oil ports of the pilot valves A6, B6, C6 and D6, no pressure output exists at the shuttle valve group, the pressure switch 8 cannot be opened, the electromagnetic directional valve I4 is at the initial position, no hydraulic oil flows into the Z4 braking port of the hydraulic motor I5 and the Z10 braking port of the hydraulic motor II 10, the brake is braked, and the vehicle keeps to be braked until the pilot valve 7 is operated again by a driver, so that the parking brake function is realized.
The above description is only a preferred embodiment of the present invention, and it should be noted that: for those skilled in the art, on the premise of not departing from the principle of the present invention, several improvements and decorations can be made, for example, the shuttle valve set for the pressure switch 8 can be replaced by an independent shuttle valve, which is arranged between the pilot valve and the plunger pump control port; the pressure switch arranged between the pilot valve and the control port of the plunger pump for controlling the electromagnetic directional valve I4 can be replaced by an independent electric button, and the like, and the improvement and the decoration also can be regarded as the protection scope of the utility model.
Claims (5)
1. A slip anti-misoperation parking brake hydraulic system comprises a plunger pump (2) connected with a hydraulic motor I (5) and a hydraulic motor II (10), wherein brakes are arranged in the hydraulic motor I (5) and the hydraulic motor II (10); an oil outlet of the hydraulic pump (1) is respectively connected with an electromagnetic directional valve I (4) and a pilot valve (7); oil outlets of the electromagnetic directional valve I (4) are respectively connected to brakes in a hydraulic motor I (5) and a hydraulic motor II (10); an oil outlet of the electromagnetic directional valve II (6) is connected to an oil inlet of the pilot valve (7); the oil outlet of the pilot valve (7) is connected to the plunger pump (2);
the method is characterized in that:
an electromagnetic directional valve II (6) is arranged in an oil path between the hydraulic pump (1) and the pilot valve (7);
and a pressure switch (8) and a shuttle valve group (9) are arranged in an oil path between the pilot valve (7) and the plunger pump (2), and the pressure switch (8) controls whether the electromagnetic directional valve I (4) is electrified or not.
2. The slip anti-misoperation parking brake hydraulic system according to claim 1, wherein: oil ports A7, B7, C7 and D7 of the pilot valve (7) are respectively connected with a control port of the plunger pump (2) through a shuttle valve group (9), a pressure switch (8) is connected with an A9 port of the shuttle valve group (9), and the shuttle valve group (9) screens the highest pressure from the pilot valve (7) and transmits the highest pressure to the pressure switch (8).
3. The slip anti-misoperation parking brake hydraulic system according to claim 1, wherein: an oil outlet of the hydraulic pump (1) is connected with an overflow valve (3).
4. The slip anti-misoperation parking brake hydraulic system according to claim 1, wherein: an oil inlet P4 of the electromagnetic directional valve I (4) is connected with an oil outlet of the hydraulic pump (1), and an oil outlet A4 of the electromagnetic directional valve I (4) is respectively connected with a braking port Z5 of a brake in the hydraulic motor I (5) and a braking port Z10 of a brake in the hydraulic motor II (10).
5. The slip anti-misoperation parking brake hydraulic system according to claim 1, wherein: and an oil port T4 of the electromagnetic directional valve I (4), an oil drain port L5 of the hydraulic motor I (5), an oil return port T6 of the electromagnetic directional valve II (6), an oil port T7 of the pilot valve (7) and an oil drain port L10 of the hydraulic motor II (10) are connected with the hydraulic oil tank (11).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920991417.7U CN210191449U (en) | 2019-06-28 | 2019-06-28 | Slippage anti-misoperation parking brake hydraulic system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920991417.7U CN210191449U (en) | 2019-06-28 | 2019-06-28 | Slippage anti-misoperation parking brake hydraulic system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN210191449U true CN210191449U (en) | 2020-03-27 |
Family
ID=69869591
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201920991417.7U Withdrawn - After Issue CN210191449U (en) | 2019-06-28 | 2019-06-28 | Slippage anti-misoperation parking brake hydraulic system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN210191449U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110182192A (en) * | 2019-06-28 | 2019-08-30 | 徐州徐工特种工程机械有限公司 | Slide anti-misoperation parking braking hydraulic system and its control method |
-
2019
- 2019-06-28 CN CN201920991417.7U patent/CN210191449U/en not_active Withdrawn - After Issue
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110182192A (en) * | 2019-06-28 | 2019-08-30 | 徐州徐工特种工程机械有限公司 | Slide anti-misoperation parking braking hydraulic system and its control method |
| CN110182192B (en) * | 2019-06-28 | 2024-03-26 | 徐州徐工特种工程机械有限公司 | Slip misoperation-preventing parking brake hydraulic system and control method thereof |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20230918 Address after: 221004 No.99, Kunpeng North Road, Xuzhou Economic and Technological Development Zone, Xuzhou City, Jiangsu Province Patentee after: XCMG CONSTRUCTION MACHINERY Co.,Ltd. SCIENCE AND TECHNOLOGY BRANCH Address before: 221004 West Side of Guangde Road, Economic and Technological Development Zone, Xuzhou City, Jiangsu Province Patentee before: XUZHOU XUGONG SPECIAL CONSTRUCTION MACHINERY Co.,Ltd. |
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| TR01 | Transfer of patent right | ||
| AV01 | Patent right actively abandoned |
Granted publication date: 20200327 Effective date of abandoning: 20240326 |
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| AV01 | Patent right actively abandoned |
Granted publication date: 20200327 Effective date of abandoning: 20240326 |
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| AV01 | Patent right actively abandoned | ||
| AV01 | Patent right actively abandoned |