CN210066879U - Stop mode control device for wheel loader - Google Patents
Stop mode control device for wheel loader Download PDFInfo
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- CN210066879U CN210066879U CN201821287526.2U CN201821287526U CN210066879U CN 210066879 U CN210066879 U CN 210066879U CN 201821287526 U CN201821287526 U CN 201821287526U CN 210066879 U CN210066879 U CN 210066879U
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- valve
- stop mode
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- 230000006837 decompression Effects 0.000 claims abstract description 47
- 230000001174 ascending effect Effects 0.000 claims abstract description 10
- 230000000630 rising effect Effects 0.000 claims abstract description 7
- 230000000903 blocking effect Effects 0.000 claims description 2
- 230000002441 reversible effect Effects 0.000 claims description 2
- 238000010586 diagram Methods 0.000 description 4
- 238000000034 method Methods 0.000 description 4
- 239000004576 sand Substances 0.000 description 3
- 239000000470 constituent Substances 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000009412 basement excavation Methods 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000002040 relaxant effect Effects 0.000 description 1
- 230000003252 repetitive effect Effects 0.000 description 1
- 230000035939 shock Effects 0.000 description 1
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Abstract
The utility model relates to a locking mode control device of wheel loader, a serial communication port, include: an angle sensor that senses an angle of a boom of the wheel loader; a control part for confirming whether the boom is located at a decompression operation time point according to the sensed angle of the boom, and closing a main control valve of the wheel loader at a highest ascending angle or a lowest descending angle of the boom; and a decompression unit configured to decompress the hydraulic pressure transmitted from the hydraulic pump of the wheel loader to the boom cylinder from the decompression operation time point to a maximum rising angle or a minimum falling angle of the boom.
Description
Technical Field
The present invention relates to a stop mode control device for a wheel loader, and more particularly, to a device for relaxing an impact in a stop mode of a wheel loader.
Background
Generally, a wheel loader can perform a work of carrying earth and sand and loading to a truck. Accordingly, the boom of the wheel loader can be repeatedly moved to the highest position for loading the truck with sand and the lowest position for the movement after loading. To improve the efficiency of such work, the wheel loader may have a stop mode in which the control lever is temporarily fixed in an operated state.
According to the related art, in the stop mode, if the boom reaches the highest raised position or the lowest lowered position, the main control valve may be closed. Therefore, the hydraulic pressure in the supply from the main control valve to the boom cylinder may be suddenly blocked. Therefore, the operator will feel a large impact and even, there is a possibility that a heavy object such as sand may fall or the wheel loader may be overturned.
SUMMERY OF THE UTILITY MODEL
The utility model provides a can reduce the locking mode controlling means of wheel loader of the impact in the locking mode.
The above-mentioned utility model can be realized through following technical scheme.
According to an aspect of the present invention, a stop mode control device of a wheel loader may include an angle sensor, a control portion, and a decompression unit. The angle sensor may sense an angle of a boom of a wheel loader (wheel loader). The control part may confirm whether the boom is located at a decompression operation time point according to the sensed angle of the boom. The control unit may close a main control valve of the wheel loader at a highest elevation angle or a lowest descent angle of the boom. The decompression unit may decompress the hydraulic pressure transmitted from the hydraulic pump of the wheel loader to the boom cylinder from the decompression operation time point to the maximum rising angle or the minimum falling angle of the boom.
In some exemplary embodiments, the angle sensor may sense an angle of the boom in a stop mode of the wheel loader. The control part may close the main control valve in the stop mode.
In some exemplary embodiments, the decompression operation time point may be a time point 4 ° to 6 ° before the highest elevation angle or the lowest depression angle.
In some exemplary embodiments, the pressure reducing unit may be connected between the main control valve and the boom cylinder to bypass a portion of the hydraulic pressure supplied from the main control valve to the boom cylinder.
In some exemplary embodiments, the pressure reduction unit may include: an on-off valve connected between the main control valve and the boom cylinder; and an electromagnetic valve for controlling the operation of the opening and closing valve.
In some exemplary embodiments, the pressure reducing unit may further include an accumulator connected to the opening-closing valve to store the hydraulic pressure bypassed by the opening-closing valve.
In some exemplary embodiments, the pressure reducing unit may further include a relief valve for limiting the hydraulic pressure bypassed to the pressure reducing valve.
In some exemplary embodiments, the pressure reducing unit may control a pilot pressure that moves a spool of the main control valve.
In some exemplary embodiments, the pressure reduction unit may include: a solenoid valve connected between a control lever of the wheel loader and the main control valve; a pressure reducing valve for setting a limit value of the pilot pressure in the solenoid valve; and a check valve for preventing a reverse flow of the pilot pressure in order to simultaneously control an ascending operation and a descending operation of the boom.
In some exemplary embodiments, the control part may stop the operation of the decompression unit if the boom reaches the highest ascent angle or the lowest descent angle.
In some exemplary embodiments, the control part may close the main control valve by blocking the supply of current with a control lever electromagnet of the wheel loader.
The utility model has the following effects.
According to the present invention, in the stop mode, the hydraulic pressure supplied to the boom cylinder can be reduced by bypassing the hydraulic pressure supplied from the main control valve to the boom cylinder or controlling the pilot pressure transmitted from the control lever to the main control valve at the decompression operation time point before the boom reaches the highest elevation angle or the lowest depression angle. Accordingly, the speed at which the boom is raised to the maximum raising position or the speed at which the boom is lowered to the maximum lowering position is reduced, and the impact transmitted to the operator is alleviated. As a result, it is also possible to prevent accidents in which the weight being carried by the wheel loader falls or the wheel loader turns upside down.
Drawings
Fig. 1 is a sectional view showing a side structure of a wheel loader according to an embodiment of the present invention.
Fig. 2 and 3 are hydraulic circuit diagrams showing a stop mode control device of a wheel loader according to an embodiment of the present invention, fig. 2 is a state in which a decompression unit of the control device is not activated, and fig. 3 is a state in which the decompression unit of the control device is activated.
Fig. 4 is a flow chart, in turn, illustrating a method for controlling a stopping mode of a wheel loader using the arrangement illustrated in fig. 3.
Fig. 5 and 6 are hydraulic circuit diagrams showing a stop mode control device of a wheel loader according to another embodiment of the present invention, fig. 5 is a state where a decompression unit of the control device is not activated, and fig. 6 is a state where the decompression unit of the control device is activated.
Fig. 7 is a flow chart, in turn, illustrating a method for controlling a stopping mode of a wheel loader using the arrangement illustrated in fig. 6.
Description of the symbols
110: angle sensor, 120, 122: first and second control levers, 130, 132: first and second electromagnets, 140: MCV, 150, 152: first and second boom cylinders, 160: pressure reducing unit, 162: opening and closing valve, 164: solenoid valves, 166: safety valve, 170: pressure reducing unit, 172: solenoid valve, 174: pressure reducing valve, 176: check valve, 180: a control unit.
Detailed Description
Preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings.
The present invention may take various forms with various modifications, and specific embodiments thereof are shown in the drawings and will herein be described in detail. However, it should be understood that the present invention is not limited to the specific forms disclosed, but includes all modifications, equivalents, and alternatives falling within the spirit and scope of the present invention. In the description of the drawings, like reference numerals are used for like components.
The terms first, second, etc. may be used to describe various elements, but these elements should not be limited by these terms. These terms are used only for the purpose of distinguishing one constituent element from another constituent element. For example, a first component may be named as a second component, and similarly, a second component may also be named as a first component, without departing from the scope of the present invention.
Unless defined otherwise, including technical or scientific terms, all terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. Terms such as those defined in commonly used dictionaries should be interpreted as having a meaning that is consistent with their meaning in the context of the relevant art and will not be interpreted in an idealized or overly formal sense unless expressly so defined herein.
Fig. 1 is a sectional view showing a side structure of a wheel loader according to an embodiment of the present invention.
Referring to fig. 1, a wheel loader may include a boom B, an arm a, a bucket T, and the like. The arm a may be rotatably connected to a tip end of the boom B. The bucket T may be rotatably coupled to a front end of the arm a. The boom B can be rotated up and down by the boom cylinder. The arm a can be rotated up and down by the arm cylinder. The boom cylinder and the arm cylinder may be formed in a pair. As another embodiment, the boom cylinder and the arm cylinder may be one.
Such a wheel loader can carry a weight and load it to a truck. Specifically, the wheel loader can carry the heavy object to a position close to the truck. The wheel loader can load the weight onto the truck by completely tilting the bucket T after raising the boom B. Thereafter, the wheel loader may lower the boom B in a state where the bucket T is positioned at the return stroke to the excavation position. The wheel loader may repeat the above-described operation after moving to the position where the weight is located.
The above-described repetitive motion may be automatically performed by the stop mode. In the detent mode, the lever may be temporarily fixed in an operated state. Therefore, in the state where the stop mode is in operation, the boom B may stop at the maximum elevation angle without being raised upward at the maximum elevation angle of the boom B. Further, at the lowest lowering angle of the boom B, the boom B may not be lowered any more, but may be stopped at the lowest lowering angle. Such stop mode may be performed by angle sensor 110 that measures the angle of boom B.
Fig. 2 and 3 are hydraulic circuit diagrams showing a stop mode control device of a wheel loader according to an embodiment of the present invention, fig. 2 is a state in which a decompression unit of the control device is not activated, and fig. 3 is a state in which the decompression unit of the control device is activated.
Referring to fig. 2 and 3, the stop mode control apparatus of the present embodiment may include an angle sensor 110, first and second control levers 120 and 122, an MCV140 (main control valve), first and second boom cylinders 150 and 152, a control part 180, and a pressure reducing unit 160.
The angle sensor 110 may be attached to the boom B. The rotation angle of the boom B sensed by the angle sensor 110 may be transmitted to the control part 180. The control part 180 may include an electromagnetic control unit of the wheel loader.
First and second electromagnets 130, 132 may be affixed to the first and second control levers 120, 122. The first and second control levers 120 and 122 are maintained in an operated state by supplying current to the first and second electromagnets 130 and 132, thereby enabling a stop mode operation. The control section 180 may control the supply of electric current to the first and second electromagnets 130, 132.
The first and second control levers 120, 122 may supply pilot pressure to the MCV 140. The pilot pressure may move a spool of the MCV140 to selectively open and close a passage of the MCV 140.
The MCV140 may be disposed between the hydraulic pump P and the first and second boom cylinders 150 and 152. The hydraulic pressure generated from the hydraulic pump P may be selectively supplied to the first and second boom cylinders 150 and 152 through the MCV 140. That is, the hydraulic pressure may be selectively supplied to the first and second boom cylinders 150, 152 through the passages of the MCV140 according to the spool position of the MCV 140.
For example, during an operation in which the boom B ascends or descends in the stop mode, the pilot pressure is transmitted from the first and second control levers 120 and 122 to the spool of the MCV140 so that the passage of the MCV140 may be opened. Thus, hydraulic pressure may be supplied to the first and second boom cylinders 150 and 152 through the opened passage of the MCV140 so that the boom B may be raised or lowered.
When the boom B reaches the highest elevation angle or the lowest descent angle, the control unit 180 may block the supply of the current to the first and second electromagnets 120 and 122. Here, the maximum elevation angle and the minimum lowering angle of the boom B may be determined according to the working environment of the wheel loader. That is, the maximum raising angle and the minimum lowering angle of the boom B may be set by the judgment of the operator. By the interruption of the current supply, the pilot pressure is not transmitted to the spool of the MCV140, so that the passage of the MCV140 can be closed. Thereby, the hydraulic pressure in the supply to the first and second boom cylinders 150 and 152 is suddenly interrupted, so that the boom B may not be raised any more at the highest raising angle or lowered no more at the lowest lowering angle. However, a sudden interruption of the hydraulic pressure may act on the operator with a large impact. Furthermore, such shocks will be transmitted to the whole wheel loader, thereby possibly causing the weight to fall from the bucket T, and even the wheel loader may turn upside down.
To prevent this, the decompression unit 160 may gradually decompress the hydraulic pressure supplied to the first and second boom cylinders 150 and 152 from the decompression operation time point before the highest rising angle or the lowest falling angle of the boom B. The decompression operation time point may be a time point 4 ° to 6 ° before the highest elevation angle or the lowest descent angle of the boom B, and is preferably a time point 5 ° before. The decompression unit 160 may gradually decompress the hydraulic pressure supplied to the first and second boom cylinders 150 and 152 from the decompression operation time point to the maximum rising angle or the minimum falling angle of the boom B. When the boom B reaches the highest elevation angle or the lowest descent angle, the control unit 180 may stop the operation of the decompression unit 160.
In the present embodiment, the decompression unit 160 may partially bypass the hydraulic pressure supplied from the MCV140 to the first and second boom cylinders 150 and 152. The decompression unit 160 may include an opening and closing valve 162, a solenoid valve 164, a relief valve 166, and an accumulator 168.
The opening/closing valve 162 may be connected between the MCV140 and the first and second boom cylinders 150 and 152. Accordingly, a part of the hydraulic pressure supplied from the MCV140 to the first and second boom cylinders 150 and 152 can be bypassed to the opening/closing valve 162. Thus, the hydraulic pressure in the supply from the MCV140 to the first and second boom cylinders 150 and 152 can be gradually decreased. As a result, the raising speed or lowering speed of the boom B can be slowed. The hydraulic pressure bypassed to the opening/closing valve 162 may be stored in the accumulator 168.
The solenoid valve 164 can control the opening and closing operation of the opening and closing valve 162. The solenoid valve 164 can open or close the opening and closing valve 162 by a control signal of the control section 180.
The relief valve 166 can restrict the hydraulic pressure bypassing the opening and closing valve 162. When the bypass hydraulic pressure to the opening/closing valve 162 becomes equal to or higher than the pressure set at the relief valve 166, the bypass hydraulic pressure can be stored in the accumulator 168 through the relief valve 166. Accordingly, the deceleration speed of the boom B can be controlled by the pressure set in the relief valve 166.
Fig. 4 is a flow chart, in turn, illustrating a method for controlling a stopping mode of a wheel loader using the arrangement illustrated in fig. 3.
Referring to fig. 3 and 4, in step ST300, the control unit 180 may confirm whether the wheel loader is in the stop mode. In the stop mode, the control part 180 may supply current to the first and second electromagnets 130 and 132 to temporarily fix the first and second levers 120 and 122 in an operated state.
In step ST302, the angle of boom B may be measured by angle sensor 110. The angle of the boom B measured by the angle sensor 110 may be input to the control part 180.
In step ST304, the control unit 180 may determine whether the boom B reaches the decompression operation time point. The decompression operation time point may be a time point 4 ° to 6 ° before the highest elevation angle or the lowest descent angle of the boom B, and is preferably a time point 5 ° before. That is, the control part 180 may determine whether the angle of the boom B transmitted from the angle sensor 110 reaches a time point 4 ° to 6 ° before the boom B in the ascending state reaches the highest ascending angle or a time point 4 ° to 6 ° before the boom B in the descending state reaches the lowest descending angle.
If the boom B has not reached the decompression operation time point, the angle sensor 110 may re-measure the angle of the boom B and the measured angle of the boom B may be transmitted to the control part 180 as in ST 304.
On the contrary, if the boom B reaches the decompression operation time point, the decompression unit 160 may be activated at step ST 306. Specifically, the control unit 180 may transmit a control signal to the solenoid valve 164 to open the opening and closing valve 162. Therefore, a part of the hydraulic pressure being supplied from the MCV140 to the first and second boom cylinders 150 and 152 can be bypassed to the accumulator 168 through the open/close valve 162. As a result, the hydraulic pressure in the supply to the first and second boom cylinders 150 and 152 can be reduced.
In step ST308, the control unit 180 may determine whether the boom B reaches the highest elevation angle or the lowest descent angle. If the boom B has not reached the highest elevation angle or the lowest lowering angle, the hydraulic pressure can be continuously bypassed by the opening/closing valve 162 as in step ST 306.
On the other hand, when the boom B reaches the highest elevation angle or the lowest descent angle, the control unit 180 may block the current supply to the first and second electromagnets 130 and 132 at step ST 310. By the interruption of the current supply, the passage of the MCV140 is blocked, so that the hydraulic pressure is no longer supplied from the MCV140 to the first and second boom cylinders 150, 152. As a result, the arm B can be stopped at the highest rising angle or the lowest falling angle.
In step ST312, the control portion 180 may transmit a control signal to the solenoid valve 164 to close the opening and closing valve 162. By closing the opening/closing valve 162, the hydraulic pressure does not bypass the opening/closing valve 162. The interruption of the current supply to the first and second electromagnets 130, 132 and the closing of the on-off valve 162 may be performed simultaneously.
Fig. 5 and 6 are hydraulic circuit diagrams showing a stop mode control device of a wheel loader according to another embodiment of the present invention, fig. 5 is a state where a decompression unit of the control device is not activated, and fig. 6 is a state where the decompression unit of the control device is activated.
The control device of the present embodiment may include substantially the same components as those of the control device illustrated in fig. 3, except for the decompression unit. Therefore, the same components are denoted by the same reference numerals, and repeated descriptions of the same components may be omitted.
Referring to fig. 5 and 6, the decompression unit 170 of the present embodiment may control the pilot pressure transmitted from the first and second levers 120 and 122 to the MCV140 to reduce the ascending speed or the descending speed of the boom B. The pressure reducing unit 170 may include a solenoid valve 172, a pressure reducing valve 174, and a check valve 176.
The solenoid valve 172 may be connected between the first and second control levers 120, 122 and the MCV 140. The solenoid valve 172 can be opened and closed by a control signal of the control unit 180. A portion of the pilot pressure 172 may bypass the open solenoid valve 172. Thus, the pilot pressure that moves the spool of the MCV140 is reduced so that the passage of the MCV140 can be partially opened. As a result, the hydraulic pressure passing through the partially opened passage of the MCV140 also drops, and thus the hydraulic pressure supplied to the first and second boom cylinders 150 and 152 can be decompressed. This can reduce the raising speed or lowering speed of the boom B.
A pressure relief valve 174 may be connected to the solenoid valve 172. The pressure set in the pressure reducing valve 174 may be a limit value of the pilot pressure. That is, if the pilot pressure becomes equal to or higher than the pressure set in the pressure reducing valve 174, the pilot pressure can pass through the pressure reducing valve 174. Accordingly, the raising speed or lowering speed of the boom B can be determined by the pressure set in the pressure reducing valve 174.
The check valve 176 may be disposed at a branching point where the pilot line from the first and second control levers 120, 122 connected to the MCV140 branches off to the solenoid valve 172. The check valve 176 may prevent the pilot pressure provided from the first control lever 120 to the solenoid valve 172 from flowing backward to the second control lever 122 or the pilot pressure provided from the second control lever 122 to the solenoid valve 172 from flowing backward to the first control lever 120. The check valve 176 can control the speed of the boom B at the time of ascending and descending at the same time.
Fig. 7 is a flow chart, in turn, illustrating a method for controlling a stopping mode of a wheel loader using the arrangement illustrated in fig. 6.
Referring to fig. 6 and 7, in step ST400, the control unit 180 may confirm whether the wheel loader is in the stop mode. In the stop mode, the control part 180 may supply current to the first and second electromagnets 130 and 132 to temporarily fix the first and second levers 120 and 122 in an operated state.
In step ST402, angle sensor 110 may measure the angle of boom B. The angle of the boom B measured by the angle sensor 110 may be input to the control part 180.
In step ST404, the control unit 180 may determine whether the boom B reaches the decompression operation time point. The decompression operation time point may be a time point 4 ° to 6 ° before the highest elevation angle or the lowest descent angle of the boom B, and is preferably a time point 5 ° before. That is, the control part 180 may determine whether the angle of the boom B transmitted from the angle sensor 110 reaches a time point 4 ° to 6 ° before the boom B in ascending reaches the highest ascending angle or a time point 4 ° to 6 ° before the boom B in descending reaches the lowest descending angle.
If the boom B has not reached the decompression operation time point, the angle sensor 110 may re-measure the angle of the boom B and the measured angle of the boom B may be transmitted to the control part 180 as in step ST 404.
On the contrary, if the boom B reaches the decompression operation time point, the decompression unit 170 may be activated at step ST 406. Specifically, the control part 180 may transmit a control signal to the solenoid valve 172 to open the solenoid valve 172. Thus, a portion of the pilot pressure in the supply from the first and second control levers 120, 122 to the MCV140 may bypass the solenoid valve 172. Thus, the pilot pressure that moves the spool of the MCV140 is reduced, so that the passage of the MCV140 may not be completely opened but partially opened. As a result, the hydraulic pressure passing through the partially opened passage of the MCV140 also drops, and thus the hydraulic pressure supplied to the first and second boom cylinders 150 and 152 can be decompressed. This can reduce the raising speed or lowering speed of the boom B.
The degree of pilot pressure bypassing the solenoid valve 172 may be adjusted by a pressure set to the pressure reducing valve 174. Further, the check valve 176 prevents the pilot pressure supplied from the first control lever 120 to the solenoid valve 172 from flowing backward to the second control lever 122 or the pilot pressure supplied from the second control lever 122 to the solenoid valve 172 from flowing backward to the first control lever 120, and thus the pilot pressure can be controlled by only one pressure reducing unit 170 in the operation of raising and lowering the boom B.
In step ST408, the control unit 180 may determine whether the boom B reaches the highest elevation angle or the lowest descent angle. If the boom B has not reached the highest ascent angle or the lowest descent angle, the pilot pressure may continue to be bypassed by the solenoid valve 172 as in step ST 406.
On the other hand, if the boom B reaches the highest elevation angle or the lowest descent angle, the control unit 180 may block the current supply to the first and second electromagnets 130 and 132 at step ST 410. Since the pilot pressure is not supplied to the MCV140, the passage of the MCV140 is blocked, so that the hydraulic pressure is no longer supplied from the MCV140 to the first and second boom cylinders 150 and 152. As a result, the arm B can be stopped at the highest rising angle or the lowest falling angle.
In step ST412, the control part 180 may transmit a control signal to the solenoid valve 172 to close the solenoid valve 172. By closing the solenoid valve 172, the pilot pressure may not bypass the solenoid valve 172. The interruption of the current supply to the first and second electromagnets 130, 132 and the closing of the solenoid valve 172 may also be performed simultaneously.
As described above, according to the present embodiment, in the stop mode, the hydraulic pressure supplied to the boom cylinder can be reduced by bypassing the hydraulic pressure supplied from the main control valve to the boom cylinder or controlling the pilot pressure transmitted from the control lever to the main control valve at the decompression operation time point before the boom reaches the highest ascent angle or the lowest descent angle. Accordingly, the speed at which the boom is raised to the maximum raising position or the speed at which the boom is lowered to the maximum lowering position is reduced, and the impact transmitted to the operator is alleviated. As a result, it is also possible to prevent accidents in which the weight being carried by the wheel loader falls or the wheel loader turns upside down.
Although the present invention has been described with reference to the preferred embodiments, those skilled in the art will appreciate that the present invention can be modified and changed in various ways without departing from the scope of the invention as set forth in the following claims.
Claims (11)
1. A stop mode control apparatus of a wheel loader, comprising:
an angle sensor that senses an angle of a boom of the wheel loader;
a control part for confirming whether the boom is located at a decompression operation time point according to the sensed angle of the boom, and closing a main control valve of the wheel loader at a highest ascending angle or a lowest descending angle of the boom; and
and a decompression unit configured to decompress the hydraulic pressure transmitted from the hydraulic pump of the wheel loader to the boom cylinder from the decompression operation time point to a maximum raising angle or a minimum lowering angle of the boom.
2. A stop mode control device for a wheel loader according to claim 1,
the angle sensor senses an angle of the boom in a stop mode of the wheel loader,
the control portion closes the main control valve in the stop mode.
3. A stop mode control device for a wheel loader according to claim 1,
the decompression operation time point is a time point 4 ° to 6 ° before the highest rising angle or the lowest falling angle.
4. A stop mode control device for a wheel loader according to claim 1,
the pressure reducing unit is connected between the main control valve and the boom cylinder to bypass a part of the hydraulic pressure supplied from the main control valve to the boom cylinder.
5. A stop mode control device for a wheel loader according to claim 4,
the decompression unit includes:
an on-off valve connected between the main control valve and the boom cylinder; and
and a solenoid valve for controlling the operation of the opening/closing valve.
6. A stop mode control device for a wheel loader according to claim 5,
the decompression unit further includes an accumulator connected to the opening-closing valve and storing the hydraulic pressure bypassed by the opening-closing valve.
7. A stop mode control device for a wheel loader according to claim 5,
the pressure reducing unit further includes a relief valve for restricting the hydraulic pressure bypassed to the opening and closing valve.
8. A stop mode control device for a wheel loader according to claim 1,
the pressure reducing unit controls pilot pressure for moving a spool of the main control valve.
9. A stop mode control device for a wheel loader according to claim 8,
the decompression unit includes:
a solenoid valve connected between a control lever of the wheel loader and the main control valve;
a pressure reducing valve for setting a limit value of the pilot pressure in the solenoid valve; and
and a check valve for preventing a reverse flow of the pilot pressure in order to simultaneously control an ascending operation and a descending operation of the boom.
10. A stop mode control device for a wheel loader according to claim 1,
the control unit stops the operation of the decompression unit when the boom reaches the maximum raising angle or the minimum lowering angle.
11. A stop mode control device for a wheel loader according to claim 1,
the control portion closes the main control valve by blocking supply of electric current with a control lever electromagnet of the wheel loader.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821287526.2U CN210066879U (en) | 2018-08-09 | 2018-08-09 | Stop mode control device for wheel loader |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821287526.2U CN210066879U (en) | 2018-08-09 | 2018-08-09 | Stop mode control device for wheel loader |
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| Publication Number | Publication Date |
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| CN210066879U true CN210066879U (en) | 2020-02-14 |
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| CN201821287526.2U Active CN210066879U (en) | 2018-08-09 | 2018-08-09 | Stop mode control device for wheel loader |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112252387A (en) * | 2020-10-30 | 2021-01-22 | 徐州徐工挖掘机械有限公司 | Boom deflection system of excavator, excavator and boom deflection control method of excavator |
-
2018
- 2018-08-09 CN CN201821287526.2U patent/CN210066879U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112252387A (en) * | 2020-10-30 | 2021-01-22 | 徐州徐工挖掘机械有限公司 | Boom deflection system of excavator, excavator and boom deflection control method of excavator |
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