CN220037120U - Landing leg hydraulic system and telescopic arm forklift for overhead working machinery - Google Patents
Landing leg hydraulic system and telescopic arm forklift for overhead working machinery Download PDFInfo
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- CN220037120U CN220037120U CN202321442852.7U CN202321442852U CN220037120U CN 220037120 U CN220037120 U CN 220037120U CN 202321442852 U CN202321442852 U CN 202321442852U CN 220037120 U CN220037120 U CN 220037120U
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- 239000003921 oil Substances 0.000 claims abstract description 59
- 238000001514 detection method Methods 0.000 claims abstract description 18
- 239000010720 hydraulic oil Substances 0.000 claims abstract description 12
- 230000009467 reduction Effects 0.000 claims abstract description 4
- 208000035657 Abasia Diseases 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000000630 rising effect Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000008602 contraction Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 230000008569 process Effects 0.000 description 1
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- Forklifts And Lifting Vehicles (AREA)
Abstract
The utility model discloses a landing leg hydraulic system and a telescopic arm forklift for an overhead working machine, wherein the landing leg hydraulic system comprises: the hydraulic oil cylinder comprises a rod cavity and a rodless cavity, wherein the rod cavity is connected with a first working oil way, and the rodless cavity is connected with a second working oil way; pressure detecting means for detecting a pressure of the rodless chamber; the control valve group comprises a hydraulic lock which is arranged on the first working oil path, a pilot oil working oil path of the hydraulic lock is communicated with the rodless cavity, and the hydraulic lock is used for being opened under the condition that the rodless cavity is larger than the preset pressure so as to realize the pressure reduction of the rodless cavity. When the pressure in the rodless cavity is increased to the preset pressure due to temperature rise, the hydraulic lock is opened, the rod cavity is communicated with the system loop, the pressure in the rodless cavity is removed, and the situation that the whole vehicle cannot walk due to misjudgment of the landing leg support caused by the fact that the pressure in the rodless cavity continuously rises to the alarm pressure by the pressure detection device and the whole vehicle control unit is avoided.
Description
Technical Field
The utility model relates to the technical field of telescopic boom forklift trucks, in particular to a landing leg hydraulic system for an overhead working machine and a telescopic boom forklift truck.
Background
The telescopic boom forklift truck, the aerial work platform, the crane and the like are movable aerial work machines for serving aerial work, equipment installation, overhaul and the like in various industries. Such work machines are often configured with legs because of the need to obtain stable foundation support to avoid tipping over during operation. During operation, the supporting legs are spread, the weight of the whole machine and the load is transferred to each supporting leg, the supporting legs adjust the vehicle body level, and the stability of the high-altitude operation machine in the working state is ensured.
The landing leg adopts the pneumatic cylinder to promote mostly, in order to avoid the landing leg to prop the ground back whole car maloperation walking and lead to the landing leg to damage, prior art judges whether the landing leg props the ground through detecting landing leg hydro-cylinder pressure, and when the landing leg props the ground, whole car can't walk. When the oil cylinder pressure value detected by the pressure detection device reaches an alarm pressure threshold value, the pressure detection device outputs an alarm signal, and the control unit obtains a landing leg grounding supporting result. However, due to the expansion and contraction phenomenon caused by the change of the working temperature, even if the support leg is in a contracted state, the situation that the support leg is in the ground supporting state is misjudged due to the fact that the pressure value of the support leg oil cylinder is increased due to the fact that the temperature is increased easily occurs, and therefore the whole vehicle cannot walk in the contracted state of the support leg, and the working process is affected.
Disclosure of Invention
The utility model aims to provide a landing leg hydraulic system and a telescopic arm forklift truck for an overhead working machine, which are used for solving the technical problem that the whole truck cannot walk due to misjudgment of landing legs on a ground support by the existing overhead working machine.
To achieve the above object, the present utility model provides a leg hydraulic system for an overhead working machine, the leg hydraulic system comprising: the hydraulic oil cylinder comprises a rod cavity and a rodless cavity, wherein the rod cavity is connected with a first working oil way, and the rodless cavity is connected with a second working oil way; pressure detection means for detecting a pressure of the rodless chamber; the control valve group comprises a hydraulic lock which is arranged on the first working oil path, a pilot oil working oil path of the hydraulic lock is communicated with the rodless cavity, and the hydraulic lock is used for being opened under the condition that the rodless cavity is larger than preset pressure so as to realize pressure reduction of the rodless cavity.
The landing leg hydraulic system for the overhead working machine disclosed by the utility model also has the following additional technical characteristics:
the hydraulic lock includes a first pilot operated check valve disposed on the first working oil path, the first pilot operated check valve configured to allow hydraulic oil to flow to the rod chamber and to be blocked in a reverse direction.
The hydraulic lock comprises a second hydraulic check valve and a third hydraulic check valve which are arranged on the first working oil path in series, and the second hydraulic check valve and the third hydraulic check valve are configured to allow hydraulic oil to flow to the rod cavity and to be blocked reversely.
The second hydraulic control one-way valve and the third hydraulic control one-way valve are identical in structure and specification.
The control valve group further comprises a balance valve, and the balance valve is arranged on the second working oil path.
The pressure detection device is a pressure sensor, and the pressure sensor is connected with the second working oil circuit through a pressure detection oil circuit.
The utility model provides a telescopic arm forklift truck which comprises a chassis and supporting legs arranged on the chassis, wherein the supporting legs comprise a supporting leg hydraulic system for an overhead working machine.
The supporting legs are frog type supporting legs.
Due to the adoption of the technical scheme, the utility model has at least the following technical effects: in the leg hydraulic system provided by the utility model, the pressure detection device is used for detecting the pressure of the rodless cavity, and the detected pressure value can be transmitted to the whole vehicle control unit, so that the control unit can judge whether the leg is in an open ground supporting state or not by comparing the pressure value of the rodless cavity. The hydraulic lock is arranged on the first working oil path connected with the rod cavity, the pilot oil working oil path of the hydraulic lock is communicated with the rodless cavity, the hydraulic lock is used for being opened under the condition that the rodless cavity is larger than the preset pressure to reduce the pressure of the rodless cavity, in other words, when the pressure in the rodless cavity is increased to the preset pressure due to temperature rise in the contracted state of the supporting leg, the hydraulic lock on the first working oil path is opened by the pressure on the pilot oil working oil path, the rod cavity is communicated with the system loop, the pressure in the rodless cavity is removed, and the phenomenon that the pressure in the rodless cavity continuously rises to the alarm pressure to enable the pressure detection device and the control unit to misjudge that the supporting leg supports the ground to cause the whole vehicle to be unable to walk is avoided.
Drawings
The accompanying drawings, which are included to provide a further understanding of the utility model and are incorporated in and constitute a part of this specification, illustrate embodiments of the utility model and together with the description serve to explain the utility model and do not constitute a limitation on the utility model. In the drawings:
FIG. 1 is a schematic diagram of a leg hydraulic system for an overhead working machine according to a first embodiment of the present utility model;
FIG. 2 is a schematic diagram of a leg hydraulic system for an overhead working machine according to a second embodiment of the present utility model;
fig. 3 is a schematic structural view of the telescopic boom forklift provided by the utility model.
Reference numerals:
1 a hydraulic cylinder, 11 a rod cavity, 12 a rodless cavity, 2 a first working oil way, 3 a second working oil way, 4 a pressure detection device, 5 a control valve group, 51 a first hydraulic check valve, 52 a second hydraulic check valve, 53 a third hydraulic check valve, 54 a balance valve, 6 a pilot oil working oil way, 7 a chassis and 8 supporting legs.
Detailed Description
In order to more clearly illustrate the general inventive concept, reference will be made in the following detailed description, by way of example, to the accompanying drawings.
It should be noted that in the following description, numerous specific details are set forth in order to provide a thorough understanding of the present utility model, however, the present utility model may be practiced in other ways than as described herein, and therefore the scope of the present utility model is not limited by the specific embodiments disclosed below.
In the embodiment of the utility model, a landing leg hydraulic system and a telescopic boom forklift for an overhead working machine are provided, and for convenience of explanation and understanding, the following matters provided by the utility model are all described on the basis of the structure of a graphical product. It will of course be appreciated by those skilled in the art that the above-described construction is provided as a specific example and illustrative only and is not intended to constitute a specific limitation on the scope of the utility model.
The utility model provides a landing leg hydraulic system for an overhead working machine, which is shown in fig. 1 and 2, and comprises a hydraulic cylinder 1, a pressure detection device 4 and a control valve group 5, wherein: the hydraulic cylinder 1 comprises a rod cavity 11 and a rodless cavity 12, wherein the rod cavity 11 is connected with a first working oil way 2, and the rodless cavity 12 is connected with a second working oil way 3; the pressure detection device 4 is used for detecting the pressure of the rodless cavity 12; the control valve group 5 comprises a hydraulic lock, the hydraulic lock is arranged on the first working oil path 2, a pilot oil working oil path 6 of the hydraulic lock is communicated with the rodless cavity 12, and the hydraulic lock is used for being opened under the condition that the rodless cavity 12 is larger than the preset pressure so as to realize the pressure reduction of the rodless cavity 12.
In the leg hydraulic system provided by the utility model, the pressure detection device 4 is used for detecting the pressure of the rodless cavity 12, and the detected pressure value can be transmitted to the whole vehicle control unit, so that the control unit can judge whether the leg is in an open ground supporting state or not by comparing the pressure value of the rodless cavity 12. The hydraulic lock is arranged on the first working oil path 2 connected with the rod cavity 11, the pilot oil working oil path 6 of the hydraulic lock is communicated with the rodless cavity 12, the hydraulic lock is used for being opened under the condition that the rodless cavity 12 is larger than the preset pressure to reduce the pressure of the rodless cavity 12, in other words, when the pressure in the rodless cavity 12 is increased to the preset pressure due to temperature rise in the contracted state of the supporting leg, the hydraulic lock on the first working oil path 2 is opened by the pressure on the pilot oil working oil path 6, the rod cavity 11 is communicated with a system loop, the pressure in the rodless cavity 12 is removed, and the situation that the pressure in the rodless cavity 12 continuously rises to the alarm pressure to cause the pressure detection device 4 to misjudge that the supporting leg supports the ground to cause the whole vehicle to be unable to walk is avoided. In specific implementation, the ratio of the acting areas of the rod cavity 11 and the rodless cavity 12 and the pilot ratio of the hydraulic lock can be selected by reasonably setting the alarm pressure obtained by the pressure detection device 4, so that the hydraulic lock can be opened when the rodless cavity 12 reaches the preset pressure, and the preset pressure is smaller than the alarm pressure, when the landing leg is contracted, the pressure of the rodless cavity 12 is increased due to the increase of the ambient temperature, when the pressure of the rodless cavity 12 is increased to the preset pressure and the alarm pressure is not reached, the hydraulic lock is opened, the pressure of the rodless cavity 12 is removed, and therefore the pressure of the rodless cavity 12 is prevented from being increased to the alarm pressure due to the increase of the temperature, and the pressure detection device 4 and the whole vehicle control unit are prevented from misjudging that the landing leg supports the ground to alarm.
It should be noted that the present utility model is not limited to the structure of the hydraulic lock, and any one of the following embodiments may be adopted:
embodiment one: as shown in fig. 1, the hydraulic lock includes a first pilot operated check valve 51 provided on the first working oil passage 2, the first pilot operated check valve 51 being configured to allow hydraulic oil to flow to the rod chamber 11 and to be blocked in the reverse direction. Compared with other forms of hydraulic locks, the hydraulic lock is formed by adopting the single hydraulic control one-way valve, has simple and reliable structure, and reduces the cost of the control valve group 5. When the pressure in the rodless cavity 12 is increased to the preset pressure due to the temperature rise in the contracted state of the supporting leg, the pilot oil working oil way 6 of the hydraulic lock opens the first hydraulic control one-way valve 51, so that the rod cavity 11 of the hydraulic oil cylinder 1 is communicated with a system loop through the first hydraulic control one-way valve 51, the pressure in the rodless cavity 12 is further removed, and the pressure in the rodless cavity 12 is prevented from continuously rising to the alarm pressure.
Embodiment two: as shown in fig. 2, the hydraulic lock includes a second pilot check valve 52 and a third pilot check valve 53 disposed in series on the first working oil passage 2, the second pilot check valve 52 and the third pilot check valve 53 being configured to allow hydraulic oil to flow toward the rod chamber 11 and to be blocked reversely. According to the hydraulic lock, the two serially connected hydraulic control check valves are adopted to form the hydraulic lock, one of the second hydraulic control check valve 52 and the third hydraulic control check valve 53 also forms a redundant valve structure on the basis of reducing the cost of the control valve group 5, so that the redundant design of the hydraulic lock is realized, when one of the second hydraulic control check valve 52 and the third hydraulic control check valve 53 fails, the other hydraulic control check valve can still realize the function of the hydraulic lock, the risk caused by failure of the hydraulic lock due to clamping stagnation of the check valve is solved, and the safety and reliability of the landing leg hydraulic system are greatly improved. When the pressure in the rodless cavity 12 is increased to the preset pressure due to the temperature rise in the contracted state of the supporting leg, the second hydraulic control one-way valve 52 and the third hydraulic control one-way valve 53 are opened by the pilot oil working oil circuit 6 of the hydraulic lock, so that the rod cavity 11 of the hydraulic oil cylinder 1 is communicated with a system loop through the third hydraulic control one-way valve 53 and the second hydraulic control one-way valve 52, the pressure in the rodless cavity 12 is further removed, and the pressure in the rodless cavity 12 is prevented from continuously rising to the alarm pressure.
Further, the second hydraulic check valve 52 and the third hydraulic check valve 53 may be identical in structure and specification, so that the front-back positional relationship of the two in the first working oil path 2 is not required, and the two may be interchanged.
As a preferred embodiment of the present utility model, as shown in fig. 1 and 2, the control valve group 5 further includes a balance valve 54, and the balance valve 54 is disposed on the second working oil passage 3. The pressure difference and the flow difference on the second working oil passage 3 are balanced by the balancing valve 54, and the working condition of the hydraulic oil is improved.
As a preferred embodiment of the present utility model, as shown in fig. 1 and 2, the pressure detecting device 4 is a pressure sensor, and the pressure sensor is connected to the second working oil path 3 through a pressure detecting oil path.
As shown in fig. 3, the telescopic boom forklift truck provided by the utility model comprises a chassis 7 and a supporting leg 8 arranged on the chassis 7, wherein the supporting leg 8 comprises a supporting leg hydraulic system for an overhead working machine.
It should be noted that, since the telescopic boom forklift includes the leg hydraulic system for the overhead working machine in all the foregoing embodiments and examples, the leg hydraulic system for the overhead working machine has the beneficial effects that the telescopic boom forklift provided by the present utility model includes, and is not described herein.
It should be further noted that the structure of the supporting leg 8 is not limited in the present utility model, in the preferred embodiment, the supporting leg 8 shown in fig. 2 is a frog-shaped supporting leg, and the supporting range of the frog-shaped supporting leg is larger, so that the present utility model is suitable for the working condition of large-scale overhead operation brought by the boom luffing and elongation of the telescopic boom forklift. In other embodiments, the legs may also be vertical legs or the like.
The technical solution protected by the present utility model is not limited to the above embodiments, and it should be noted that, the combination of the technical solution of any one embodiment with the technical solution of the other embodiment or embodiments is within the scope of the present utility model. While the utility model has been described in detail in the foregoing general description and specific examples, it will be apparent to those skilled in the art that modifications and improvements can be made thereto. Accordingly, such modifications or improvements may be made without departing from the spirit of the utility model and are intended to be within the scope of the utility model as claimed.
Claims (8)
1. A leg hydraulic system for an overhead working machine, the leg hydraulic system comprising:
the hydraulic oil cylinder comprises a rod cavity and a rodless cavity, wherein the rod cavity is connected with a first working oil way, and the rodless cavity is connected with a second working oil way;
pressure detection means for detecting a pressure of the rodless chamber;
the control valve group comprises a hydraulic lock which is arranged on the first working oil path, a pilot oil working oil path of the hydraulic lock is communicated with the rodless cavity, and the hydraulic lock is used for being opened under the condition that the rodless cavity is larger than preset pressure so as to realize pressure reduction of the rodless cavity.
2. The leg hydraulic system for an overhead working machine according to claim 1, wherein,
the hydraulic lock includes a first pilot operated check valve disposed on the first working oil path, the first pilot operated check valve configured to allow hydraulic oil to flow to the rod chamber and to be blocked in a reverse direction.
3. The leg hydraulic system for an overhead working machine according to claim 1, wherein,
the hydraulic lock comprises a second hydraulic check valve and a third hydraulic check valve which are arranged on the first working oil path in series, and the second hydraulic check valve and the third hydraulic check valve are configured to allow hydraulic oil to flow to the rod cavity and to be blocked reversely.
4. A leg hydraulic system for an overhead working machine according to claim 3, wherein,
the second hydraulic control one-way valve and the third hydraulic control one-way valve are identical in structure and specification.
5. A leg hydraulic system for an overhead working machine according to any one of claims 1 to 4, characterized in that,
the control valve group further comprises a balance valve, and the balance valve is arranged on the second working oil path.
6. A leg hydraulic system for an overhead working machine according to any one of claims 1 to 4, characterized in that,
the pressure detection device is a pressure sensor, and the pressure sensor is connected with the second working oil circuit through a pressure detection oil circuit.
7. A telescopic boom forklift comprising a chassis and a leg mounted to the chassis, wherein the leg comprises a leg hydraulic system for an overhead working machine according to any one of claims 1 to 6.
8. The telescopic boom forklift of claim 7, wherein,
the supporting legs are frog type supporting legs.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321442852.7U CN220037120U (en) | 2023-06-06 | 2023-06-06 | Landing leg hydraulic system and telescopic arm forklift for overhead working machinery |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321442852.7U CN220037120U (en) | 2023-06-06 | 2023-06-06 | Landing leg hydraulic system and telescopic arm forklift for overhead working machinery |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN220037120U true CN220037120U (en) | 2023-11-17 |
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ID=88721961
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202321442852.7U Active CN220037120U (en) | 2023-06-06 | 2023-06-06 | Landing leg hydraulic system and telescopic arm forklift for overhead working machinery |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN220037120U (en) |
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2023
- 2023-06-06 CN CN202321442852.7U patent/CN220037120U/en active Active
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