CN220600117U - Amplitude-variable hydraulic control system with emergency falling function - Google Patents
Amplitude-variable hydraulic control system with emergency falling function Download PDFInfo
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- CN220600117U CN220600117U CN202322333669.XU CN202322333669U CN220600117U CN 220600117 U CN220600117 U CN 220600117U CN 202322333669 U CN202322333669 U CN 202322333669U CN 220600117 U CN220600117 U CN 220600117U
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- 239000010720 hydraulic oil Substances 0.000 claims abstract description 32
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- 230000008859 change Effects 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 230000007246 mechanism Effects 0.000 description 3
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- 230000002457 bidirectional effect Effects 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 238000013016 damping Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
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Abstract
An amplitude-variable hydraulic control system with emergency falling. The problems of low control precision and potential safety hazard of the existing luffing control system are solved. The hydraulic oil of the first reversing valve is connected with the rodless cavity of the amplitude changing oil cylinder through the second reversing valve, and the second reversing valve is provided with a first position enabling hydraulic oil of the first reversing valve to be communicated with the rodless cavity and a second position enabling hydraulic oil of the rodless cavity to be connected with the oil tank through the proportional flow valve. The rodless cavity of the amplitude variation oil cylinder is connected with the second reversing valve, so that a hydraulic oil return channel of the rodless cavity of the amplitude variation oil cylinder becomes simple, the control precision is greatly improved, and the safety is high.
Description
Technical Field
The utility model relates to engineering machinery, in particular to an amplitude-variable hydraulic control system with emergency falling.
Background
An overhead working truck is a special vehicle that transports workers and equipment to the site and performs overhead work. In the use process of the overhead working truck, an operator can stand on the platform, the height of the telescopic oil cylinder of the luffing oil cylinder, which is tens of meters from the ground after all the telescopic oil cylinders extend out, so that extremely high requirements are provided for the safety of a telescopic system of the luffing system, and meanwhile, the comfort of the operator is also important. The prior luffing system is shown in figure 1, and comprises a reversing valve, a bidirectional balance valve and a luffing cylinder, wherein when the luffing cylinder stretches: the reversing valve is positioned at the right position, the one-way valve side of the hydraulic oil balance valve (left side) enters a rodless cavity of the oil cylinder, meanwhile, the control oil can open the balance valve (right side), and the oil in the rod cavity of the oil cylinder passes through the right side of the balance valve and returns to the reversing valve to realize the extension of the oil cylinder; when the amplitude-variable oil cylinder contracts, the amplitude-variable oil cylinder is: the reversing valve is positioned at the left position, the one-way valve of the hydraulic oil balancing valve (right side) is inserted into the rod cavity of the oil cylinder, meanwhile, the balancing valve (left side) is opened by control oil, and oil in the rodless cavity of the oil cylinder passes through the balancing valve (left side) to the reversing valve for oil return, so that the oil cylinder is contracted. This system has the following problems: 1. the falling speed of the amplitude variation is limited by adjusting the input current of the reversing valve and controlling the opening of the valve core of the reversing valve, and the amplitude variation is required to pass through a balance valve (right side) to the oil cylinder and then pass through the balance valve (left side) to return to the reversing valve to the oil tank when falling, so that the accuracy of the amplitude variation (i.e. the shrinkage of the amplitude variation oil cylinder) is low due to the influence of a loop and a delay pipeline.
2. Because there is often a long-time operation in a certain position again when working aloft, when the operation needs to become amplitude and fall, because through long-time standing to and under the effect of gravity, the fluid in the pipeline can not keep for a long time, does not have hydraulic oil in the pipeline, can have the shake problem in the moment that hydraulic oil is full of the pipe, and the operator also can feel the platform shake on the platform, causes the operator uncomfortable, also has certain potential safety hazard.
3. When the hydraulic main pump of the overhead working truck fails or an electrical system fails, the luffing cylinder cannot retract, and operators working on the platform of the overhead working truck can only descend from the high altitude by means of other equipment; to this problem, the high-working-capacity industrial truck of the rice number at present can be provided with an emergency pump, and oil can be supplied through the emergency pump when the main pump fails, but the amplitude-variable balance valve does not have a purely mechanical emergency mechanism, and because the emergency pump generally provides smaller flow, after the service time of the main valve is prolonged, internal leakage can be increased, and the problem that the amplitude-variable oil cylinder of the emergency pump cannot retract can be caused.
Disclosure of Invention
The utility model provides an amplitude variation hydraulic control system with emergency drop, which aims to solve the problems of low control precision and potential safety hazard of the existing amplitude variation control system in the background technology.
The technical scheme of the utility model is as follows: the amplitude variation hydraulic control system with the emergency falling comprises an amplitude variation oil cylinder and a first reversing valve, wherein the amplitude variation oil cylinder comprises a rod cavity and a rodless cavity, an amplitude variation control valve group is arranged between the first reversing valve and the amplitude variation oil cylinder, the amplitude variation control valve group comprises a second reversing valve and a proportional flow valve, the rod cavity is connected with an oil tank, hydraulic oil of the first reversing valve is connected with the rodless cavity of the amplitude variation oil cylinder through the second reversing valve, and the second reversing valve is provided with a first position for enabling hydraulic oil of the first reversing valve to be communicated with the rodless cavity and a second position for enabling hydraulic oil of the rodless cavity to be connected with the oil tank through the proportional flow valve.
As a further development of the utility model, the proportional flow valve is connected to the tank via a pressure compensator.
As a further improvement of the utility model, the pressure oil at the oil inlet of the pressure compensator enters the control cavity of the pressure compensator, the pressure oil at the oil outlet of the proportional flow valve enters the spring cavity of the pressure compensator, and the pressure oil and the elastic force in the spring cavity of the pressure compensator are matched with each other to control the opening of the pressure compensator.
As a further development of the utility model, the proportional flow valve is an electric proportional valve, which is provided with a manual control.
As a further improvement of the utility model, the amplitude control valve group comprises an overflow valve, and the overflow valve is arranged between the rodless cavity of the amplitude oil cylinder and the oil tank.
As a further improvement of the utility model, a throttle valve is arranged between the rodless cavity of the amplitude-variable oil cylinder and the overflow valve.
As a further improvement of the utility model, a one-way valve is arranged between the first reversing valve and the second reversing valve, and the second reversing valve is used for reversely stopping the rodless cavity to be connected with the oil tank when the second reversing valve is positioned at the first position.
As a further development of the utility model, the proportional flow valve selects hydraulic oil from between the one-way valve and the second directional valve when the second directional valve is in the second position, so that hydraulic oil without a rod chamber is connected to the tank.
As a further improvement of the utility model, the first reversing valve is a two-position four-way reversing valve.
As a further improvement of the utility model, the second reversing valve is a two-position two-way electromagnetic reversing valve, and the second reversing valve is provided with a manual reversing operation part.
The utility model has the beneficial effects that the rodless cavity of the luffing cylinder is connected with the second reversing valve, so that the potential shaking problem when the platform stands for a long time and then the luffing cylinder is retracted is eliminated. The hydraulic oil return channel of the rodless cavity of the amplitude variation oil cylinder is simple, and the control precision is greatly improved; through the arrangement of the proportional flow valve, the amplitude falling speed can be controlled, and the precision of the aerial working platform is improved. The utility model also has the advantages of simple structure, convenient assembly, safety, reliability, long service life and the like.
Drawings
Fig. 1 is a schematic diagram of the hydraulic principle of the luffing control system of the existing overhead working truck.
Fig. 2 is a schematic structural diagram of an embodiment of the present utility model.
Fig. 3 is a schematic diagram of the hydraulic principle of the luffing control system according to the embodiment of the present utility model.
In the figure, 1, an amplitude-variable oil cylinder; 11. a rod cavity is arranged; 12. a rodless cavity; 2. a first reversing valve; 3. a variable amplitude control valve group; 4. a second reversing valve; 41. a manual reversing operation part; 5. a proportional flow valve; 51. a manual control; 6. a pressure compensator; 7. an overflow valve; 8. a throttle valve; 9. a one-way valve; t, an oil tank.
Detailed Description
Embodiments of the utility model are further described below with reference to the accompanying drawings:
the amplitude-variable hydraulic control system with the emergency falling is shown by combining fig. 2 with fig. 3, and comprises an amplitude-variable oil cylinder 1 and a first reversing valve 2, wherein the first reversing valve 2 is a two-position four-way reversing valve. The amplitude-variable oil cylinder 1 comprises a rod cavity 11 and a rodless cavity 12, an amplitude-variable control valve group 3 is arranged between the first reversing valve 2 and the amplitude-variable oil cylinder 1, the amplitude-variable control valve group 3 comprises a second reversing valve 4 and a proportional flow valve 5, the rod cavity 11 is connected with an oil tank T, hydraulic oil of the first reversing valve 2 is connected with a rodless cavity 12 of the amplitude-variable oil cylinder 1 through the second reversing valve 4, and the second reversing valve 4 is provided with a first position for enabling hydraulic oil of the first reversing valve 2 to be communicated with the rodless cavity 12 and a second position for enabling hydraulic oil of the rodless cavity 12 to be connected with the oil tank T through the proportional flow valve 5. The utility model has the beneficial effects that the rodless cavity of the luffing cylinder is connected with the second reversing valve, so that the potential shaking problem when the platform stands for a long time and then the luffing cylinder is retracted is eliminated. The hydraulic oil return channel of the rodless cavity of the amplitude variation oil cylinder is simple, and the control precision is greatly improved; through the arrangement of the proportional flow valve, the amplitude falling speed can be controlled, and the precision of the aerial working platform is improved. The utility model also has the advantages of simple structure, convenient assembly, safety, reliability, long service life and the like. Further description is made in connection with the principle of hydraulics: the amplitude-variable oil cylinder extends to act: the hydraulic oil passes through the reversing position of the first reversing valve to the oil inlet one-way valve, the second reversing valve (electromagnetic reversing valve) and the rodless cavity of the amplitude-variable oil cylinder, at the moment, the residual hydraulic oil in the rod cavity of the amplitude-variable oil cylinder (generally no oil exists, the position of the oil tank is lower and has back pressure, and the hydraulic oil generally does not enter the rod cavity) directly returns to the oil tank through an internal oil duct of the amplitude-variable control valve group, so that the extending action of the oil cylinder is realized; the variable amplitude oil cylinder contracts: the electromagnetic directional valve (the second directional valve) is electrified, the proportional flow valve is electrified, hydraulic oil in the rodless cavity of the amplitude-variable oil cylinder is electrified through the second directional valve, and the proportional flow valve and the pressure compensation valve return oil tank realize the shrinkage action of the oil cylinder. A one-way valve 9 is arranged between the first reversing valve 2 and the second reversing valve 4, and the second reversing valve 4 is connected with the oil tank T by a reverse stop rodless cavity 12 when the second reversing valve 4 is positioned at a first position. Specifically, the proportional flow valve 5 selects hydraulic oil from between the check valve 9 and the second directional valve 4 when the second directional valve is in the second position so that the hydraulic oil of the rodless chamber 12 is connected to the tank T. Because the working ports of the amplitude control valve bank are directly arranged in the rodless cavity and the rod-containing cavity of the amplitude cylinder, hydraulic oil in the rodless cavity of the cylinder directly acts on the electromagnetic directional valve, and the oil inlet one-way valve is filled with oil when the cylinder stretches, the oil paths between the electromagnetic directional valve and the proportional flow valve are full of oil, the process that the platform is not filled with the pipeline after the platform is kept stand for a long time and the amplitude cylinder stretches again is avoided, and thus the potential shaking problem when the platform is kept stand for a long time and then the amplitude cylinder stretches back is eliminated.
The proportional flow valve 5 is connected with the oil tank T through a pressure compensator 6. Specifically, the pressure oil at the oil inlet of the pressure compensator 6 enters the control cavity of the pressure compensator 6, the pressure oil at the oil outlet of the proportional flow valve 5 enters the spring cavity of the pressure compensator 6, and the pressure oil and the elastic force in the spring cavity of the pressure compensator 6 cooperate with each other to control the opening of the pressure compensator 6. In particular, the method comprises the steps of,
the use of the balance valve is reduced, meanwhile, the oil is not required to return through the balance valve of the oil cylinder and the connecting oil way thereof (the opening of the valve core of the change valve is controlled to be limited by adjusting the input current of the change valve, and the oil is required to pass through the balance valve to the oil cylinder when the amplitude falls and returns to the change valve to the oil tank when the amplitude falls) like the old system (the oil return channel of the hydraulic oil of the rodless cavity of the oil cylinder is simplified, and the control precision is improved; the opening of the proportional flow valve is controlled by adjusting the current of the proportional flow valve to control the amplitude falling speed, and the falling speed is independent of the load and is only related to the input current of the proportional flow valve under the action of the pressure compensator, so that the accuracy of the aerial working platform is improved.
The proportional flow valve 5 is an electric proportional valve, and the proportional flow valve 5 is provided with a manual control member 51. Specifically, the second reversing valve 4 is a two-position two-way electromagnetic reversing valve, and the second reversing valve 4 is provided with a manual reversing operation portion 41. However, when the hydraulic and electric system fails (as shown in fig. 2, the platform of the aerial working vehicle is not high from the ground, and the operator on the ground can conveniently operate), the manual reversing operation part for operating the second reversing valve and the manual control part of the proportional flow valve can realize the control of the amplitude-variable oil cylinder by the emergency mechanism, so that the aerial working platform descends to the lowest position.
The amplitude-variable control valve group 3 comprises an overflow valve 7, and the overflow valve 7 is arranged between a rodless cavity 12 of the amplitude-variable oil cylinder 1 and an oil tank T. A throttle valve 8 is arranged between the rodless cavity 12 of the amplitude variation oil cylinder 1 and the overflow valve 7. Specifically, when the emergency mechanism of the proportional flow valve of the second reversing valve fails, the hydraulic oil in the rodless cavity of the oil cylinder can be returned through the overflow valve by adjusting the adjusting screw of the overflow valve to be completely loosened, so that the emergency retraction of the amplitude oil cylinder is realized. Because the damping (throttle valve) with small aperture is arranged in front of the overflow valve, the retraction speed of the amplitude-variable oil cylinder can be slow and stable.
In the description of the present utility model, it should be noted that the terms "center", "longitudinal", "lateral", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, are merely for convenience in describing the present utility model and simplifying the description, and do not indicate or imply that the apparatus or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present utility model. Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the present utility model, it should be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be either fixedly connected, detachably connected, or integrally connected, for example; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present utility model will be understood in specific cases by those of ordinary skill in the art. Furthermore, in the description of the present utility model, unless otherwise indicated, the meaning of "a plurality" is two or more.
The skilled person will know: while the utility model has been described in terms of the foregoing embodiments, the inventive concepts are not limited to the utility model, and any modifications that use the inventive concepts are intended to be within the scope of the appended claims.
Claims (10)
1. The amplitude-variable hydraulic control system with the emergency falling comprises an amplitude-variable oil cylinder (1) and a first reversing valve (2), wherein the amplitude-variable oil cylinder (1) comprises a rod cavity (11) and a rodless cavity (12), and is characterized in that an amplitude-variable control valve group (3) is arranged between the first reversing valve (2) and the amplitude-variable oil cylinder (1), the amplitude-variable control valve group (3) comprises a second reversing valve (4) and a proportional flow valve (5), the rod cavity (11) is connected with an oil tank (T), hydraulic oil of the first reversing valve (2) is connected with a rodless cavity (12) of the amplitude-variable oil cylinder (1) through the second reversing valve (4), and the second reversing valve (4) is provided with a first position enabling hydraulic oil of the first reversing valve (2) to be communicated with the rodless cavity (12) and a second position enabling hydraulic oil of the rodless cavity (12) to be connected with the oil tank (T) through the proportional flow valve (5).
2. The luffing hydraulic control system with emergency drop according to claim 1, characterized in that the proportional flow valve (5) is connected to the tank (T) via a pressure compensator (6).
3. The luffing hydraulic control system with emergency drop according to claim 2, wherein the pressure oil at the oil inlet of the pressure compensator (6) enters a control cavity of the pressure compensator (6), the pressure oil at the oil outlet of the proportional flow valve (5) enters a spring cavity of the pressure compensator (6), and the opening of the pressure compensator (6) is controlled by cooperation of the pressure oil and the spring force in the spring cavity of the pressure compensator (6).
4. The luffing hydraulic control system with emergency drop according to claim 1, wherein the proportional flow valve (5) is an electric proportional valve, and the proportional flow valve (5) is provided with a manual control member (51).
5. The luffing hydraulic control system with emergency drop according to claim 1, wherein the luffing control valve group (3) comprises an overflow valve (7), and the overflow valve () is arranged between a rodless cavity (12) of the luffing cylinder (1) and the oil tank (T).
6. The luffing hydraulic control system with emergency drop according to claim 5, wherein a throttle valve (8) is arranged between the rodless cavity (12) of the luffing cylinder (1) and the overflow valve (7).
7. The luffing hydraulic control system with emergency drop according to claim 1, wherein a one-way valve (9) is arranged between the first reversing valve (2) and the second reversing valve (4), and the second reversing valve (4) is connected with the oil tank (T) by reversely stopping the rodless cavity (12) when the second reversing valve is in the first position.
8. The luffing hydraulic control system with emergency drop according to claim 7, characterized in that the proportional flow valve (5) selects hydraulic oil from between the one-way valve (9) and the second reversing valve (4) when the second reversing valve is in the second position so that the hydraulic oil of the rodless chamber (12) is connected to the tank (T).
9. The luffing hydraulic control system with emergency drop according to claim 1, wherein the first reversing valve (2) is a two-position four-way reversing valve.
10. The luffing hydraulic control system with emergency drop according to claim 1, wherein the second reversing valve (4) is a two-position two-way electromagnetic reversing valve, and the second reversing valve (4) is provided with a manual reversing operation part (41).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202322333669.XU CN220600117U (en) | 2023-08-30 | 2023-08-30 | Amplitude-variable hydraulic control system with emergency falling function |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202322333669.XU CN220600117U (en) | 2023-08-30 | 2023-08-30 | Amplitude-variable hydraulic control system with emergency falling function |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN220600117U true CN220600117U (en) | 2024-03-15 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202322333669.XU Active CN220600117U (en) | 2023-08-30 | 2023-08-30 | Amplitude-variable hydraulic control system with emergency falling function |
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| Country | Link |
|---|---|
| CN (1) | CN220600117U (en) |
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2023
- 2023-08-30 CN CN202322333669.XU patent/CN220600117U/en active Active
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