CN115653957B - Hydraulic leveling system and aerial work platform - Google Patents
Hydraulic leveling system and aerial work platform Download PDFInfo
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- CN115653957B CN115653957B CN202211575707.6A CN202211575707A CN115653957B CN 115653957 B CN115653957 B CN 115653957B CN 202211575707 A CN202211575707 A CN 202211575707A CN 115653957 B CN115653957 B CN 115653957B
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- 230000002457 bidirectional effect Effects 0.000 claims description 18
- 239000003921 oil Substances 0.000 abstract description 196
- 239000010720 hydraulic oil Substances 0.000 abstract description 29
- 230000000694 effects Effects 0.000 abstract description 4
- 230000009471 action Effects 0.000 description 2
- 230000001360 synchronised effect Effects 0.000 description 2
- 230000006978 adaptation Effects 0.000 description 1
- 230000003111 delayed effect Effects 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
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- 230000008569 process Effects 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
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Abstract
The invention belongs to the technical field of hydraulic equipment and discloses a hydraulic leveling system and an aerial work platform. The hydraulic leveling system provided by the invention can avoid the problem that the telescopic rod in the leveling cylinder at the far end of the oil pump generates telescopic delay relative to the telescopic rod of the leveling cylinder at the near end due to insufficient hydraulic oil pressure, and can effectively ensure the leveling speed and the leveling effect of a lifting platform when being applied to an aerial work platform.
Description
Technical Field
The invention relates to the technical field of hydraulic equipment, in particular to a hydraulic leveling system and an aerial work platform.
Background
At present, in order to further improve the leveling effect of an aerial work platform, a leveling hydraulic system of the aerial work platform is generally provided with a plurality of leveling cylinders. In a hydraulic system with a plurality of leveling oil cylinders, telescopic rods of the leveling oil cylinders are connected with a lifting platform together, rod cavities and rodless cavities of the leveling oil cylinders are communicated in sequence and are communicated with oil tanks, oil pumps and other components in the hydraulic system. When the hydraulic leveling system works, hydraulic oil in the oil tank is pumped by the oil pump and then sequentially introduced into the rod cavities or the rodless cavities of the leveling oil cylinders through the pipelines, so that the common control of the telescopic rods of the leveling oil cylinders is realized. For some high-altitude operation platforms with higher meters, the pipeline for communicating the leveling cylinders is longer, and in the process that hydraulic oil flows into the leveling cylinders through the pipeline in sequence, the oil pressure in the pipeline far away from the oil pump is slowly lifted, so that the telescopic action of the telescopic rod in the leveling cylinder at the far end after being pushed by the hydraulic oil is delayed relative to that of the leveling cylinder at the near end, and the leveling speed and the leveling reliability are influenced.
Disclosure of Invention
The invention aims to provide a hydraulic leveling system and an aerial work platform, and effectively solves the problems of introduction of hydraulic oil in a leveling oil cylinder at the far end of an oil pump in a multi-cylinder hydraulic leveling system and action lag of a telescopic rod.
In order to achieve the purpose, the invention adopts the following technical scheme:
a hydraulic leveling system comprises an oil tank, an oil pump, a leveling reversing valve and a plurality of leveling oil cylinders, wherein the oil tank is communicated with an oil inlet of the oil pump, an oil outlet of the oil pump is communicated with an oil inlet of the leveling reversing valve, two working oil ports of the leveling reversing valve are respectively communicated with a rod cavity and a rodless cavity of the leveling oil cylinders in sequence through a first oil pipe and a second oil pipe, and the hydraulic leveling system further comprises a pressurizing reversing valve and a pressurizing pump; wherein,
two adjacent all be provided with between the leveling cylinder pressure boost switching-over valve, the oil inlet of pressure boost switching-over valve passes through the booster pump intercommunication the oil tank, two working fluid ports of pressure boost switching-over valve communicate respectively first oil pipe with the second oil pipe.
Optionally, the oil-saving control system further comprises a constant flow valve, an oil outlet of the booster pump is communicated with an oil inlet of the constant flow valve, and an oil outlet of the constant flow valve is communicated with an oil inlet of the booster reversing valve through a third oil pipe.
Optionally, the oil tank further comprises an overflow valve, an oil inlet of the overflow valve is communicated with the third oil pipe, and an oil outlet of the overflow valve is communicated with the oil tank.
Optionally, a working oil port b1 of the pressure boosting reversing valve is communicated with the first oil pipe through a first connecting pipeline, a first check valve is arranged on the first connecting pipeline, and the first check valve is configured to be communicated in a one-way manner from the working oil port b1 of the pressure boosting reversing valve to the first oil pipe.
Optionally, a working oil port b2 of the pressure-boosting reversing valve is communicated with the second oil pipe through a second connecting pipeline, a second check valve is arranged on the second connecting pipeline, and the second check valve is configured to be communicated in a one-way manner from a working oil port b1 of the pressure-boosting reversing valve to the second oil pipe.
Optionally, the hydraulic control system further comprises a first bidirectional balance valve, the first bidirectional balance valve comprises a first switch valve and a second switch valve, the first switch valve is arranged between a working oil port a1 of the leveling reversing valve and the adjacent rod cavity of the leveling oil cylinder and on the first oil pipe, the second switch valve is arranged between a working oil port a2 of the leveling reversing valve and the adjacent rod cavity of the leveling oil cylinder and on the second oil pipe.
Optionally, the leveling device further comprises a second bidirectional balance valve, the second bidirectional balance valve is arranged between two adjacent leveling cylinders, the second bidirectional balance valve comprises a third switch valve and a fourth switch valve, the third switch valve is arranged on the first oil pipe between the rod cavity of one of the leveling cylinders and the rod cavity of the other leveling cylinder, and the fourth switch valve is arranged on the second oil pipe between the rodless cavity of one of the leveling cylinders and the rodless cavity of the other leveling cylinder.
Optionally, the boost converter valve is provided as a solenoid converter valve.
Optionally, the leveling and reversing valve is provided as a solenoid reversing valve.
The aerial work platform comprises a lifting platform and the hydraulic leveling system, wherein the hydraulic leveling system is provided with a plurality of telescopic rods of the leveling oil cylinders, and the telescopic rods are connected with the lifting platform.
Has the advantages that:
according to the hydraulic leveling system, the pressurizing reversing valve and the pressurizing pump are additionally arranged, the pressurizing reversing valve is arranged between two adjacent leveling cylinders, the pressurizing pump is controlled to work, so that a part of hydraulic oil in the oil tank can be pre-introduced into the first oil pipe or the second oil pipe through the pressurizing pump via the pressurizing reversing valve, the oil pressure in the first oil pipe or the second oil pipe is increased and is in a leveling standby state, when the hydraulic leveling system works, the hydraulic oil in the oil tank is pumped by the oil pump and then is introduced into the first oil pipe or the second oil pipe, and then the hydraulic oil is pre-pumped by the pressurizing pump to rapidly lift the oil pressure in the first oil pipe or the second oil pipe and rapidly drive the telescopic rod of the leveling cylinder to stretch, so that synchronous stretching of the telescopic rods of the leveling cylinders at different positions is effectively ensured, the problem that the telescopic rod in the leveling cylinder at the far end of the oil pump generates stretching delay relative to the telescopic rod of the leveling cylinder at the near end due to insufficient hydraulic oil pressure is solved, and the leveling speed and the leveling effect are effectively ensured.
Drawings
FIG. 1 is a schematic view of a hydraulic circuit of the hydraulic leveling system of the present invention.
In the figure:
100. an oil tank;
200. an oil pump;
300. leveling the reversing valve;
400. a leveling cylinder;
510. a first oil pipe; 520. a second oil pipe; 530. a third oil pipe; 541. a first connecting line; 542. a first check valve; 551. a second connecting line; 552. a second one-way valve;
610. a booster reversing valve; 620. a booster pump; 630. a constant flow valve; 640. an overflow valve;
700. a first bidirectional balancing valve; 710. a first on-off valve; 720. a second on-off valve;
800. a second bidirectional balancing valve; 810. a third on-off valve; 820. and a fourth switch valve.
Detailed Description
The present invention will be described in further detail with reference to the drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting of the invention. It should be further noted that, for the convenience of description, only some of the structures related to the present invention are shown in the drawings, not all of the structures.
In the description of the present invention, unless expressly stated or limited otherwise, the terms "connected," "connected," and "fixed" are to be construed broadly, e.g., as meaning permanently connected, removably connected, or integral to one another; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
In the present invention, unless otherwise expressly stated or limited, "above" or "below" a first feature means that the first and second features are in direct contact, or that the first and second features are not in direct contact but are in contact with each other via another feature therebetween. Also, the first feature being "on," "above" and "over" the second feature includes the first feature being directly on and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature. "beneath," "under" and "beneath" a first feature includes the first feature being directly beneath and obliquely beneath the second feature, or simply indicating that the first feature is at a lesser elevation than the second feature.
In the description of the present embodiment, the terms "upper", "lower", "right", etc. are used in an orientation or positional relationship based on that shown in the drawings only for convenience of description and simplicity of operation, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first" and "second" are used only for descriptive purposes and are not intended to have a special meaning.
The embodiment provides an aerial working platform which comprises a jib assembly, a lifting platform arranged on the jib assembly and a hydraulic leveling system. Referring to fig. 1, the hydraulic leveling system includes an oil tank 100, an oil pump 200, a leveling and reversing valve 300, a plurality of leveling cylinders 400, a pressurization and reversing valve 610, and a booster pump 620, where the oil tank 100 is communicated with an oil inlet of the oil pump 200, an oil outlet of the oil pump 200 is communicated with an oil inlet of the leveling and reversing valve 300, two working oil ports of the leveling and reversing valve 300 are sequentially communicated with rod cavities and rodless cavities of the leveling cylinders 400 through a first oil pipe 510 and a second oil pipe 520, respectively, telescopic rods of the leveling cylinders 400 are all connected with a lifting platform, the pressurization and reversing valve 610 is disposed between two adjacent leveling cylinders 400, an oil inlet of the pressurization and reversing valve 610 is communicated with the oil tank 100 through the booster pump 620, and two working oil ports of the pressurization and reversing valve 610 are respectively communicated with the first oil pipe 510 and the second oil pipe 520.
In this embodiment, the operation of the booster pump 620 is controlled, so that a part of the hydraulic oil in the oil tank 100 can be pre-pumped into the first oil pipe 510 or the second oil pipe 520 through the booster pump 620 via the booster directional valve 610, and the hydraulic oil in the first oil pipe 510 or the second oil pipe 520 is increased and is in a leveling standby state, when the hydraulic leveling system operates, the hydraulic oil in the oil tank 100 is pumped by the oil pump 200 and then is pumped into the first oil pipe 510 or the second oil pipe 520, and then the hydraulic oil pre-pumped by the booster pump 620 is matched with the hydraulic oil pre-pumped into the first oil pipe 510 or the second oil pipe 520, so that the hydraulic oil in the first oil pipe 510 or the second oil pipe 520 is rapidly raised and the telescopic rod of the leveling cylinder 400 is rapidly driven to stretch, thereby effectively ensuring the synchronous stretching of the telescopic rods of the leveling cylinders 400 at different positions, avoiding the problem that the telescopic rod of the leveling cylinder 400 at the far end of the oil pump 200 generates a stretching delay relative to the telescopic rod of the leveling cylinder 400 at the near end due to insufficient pressure, and effectively ensuring the leveling speed and the leveling effect.
In this embodiment, two leveling cylinders 400 are provided.
Specifically, as shown in fig. 1, the working oil port a1 of the leveling directional control valve 300 is communicated with the first oil pipe 510, the working oil port a2 of the leveling directional control valve 300 is communicated with the second oil pipe 520, the working oil port b1 of the boosting directional control valve 610 is communicated with the first oil pipe 510 through the first connecting pipeline 541, and the working oil port b2 of the boosting directional control valve 610 is communicated with the second oil pipe 520 through the second connecting pipeline 551.
In this embodiment, when it is required to control the telescopic rod of the leveling cylinder 400 to extend outward, the valve body of the pressurization reversing valve 610 is controlled to move rightward, so that the oil inlet of the pressurization reversing valve 610 is communicated with the working oil port b2, the oil return port of the pressurization reversing valve 610 is communicated with the working oil port b1, the pressurizing pump 620 is controlled to pump hydraulic oil to the oil tank 100, the hydraulic oil passes through the pressurizing pump 620 and then is introduced into the first oil pipe 510 through the first connecting pipeline 541, so that the oil pressure in the first oil pipe 510 is effectively raised and kept in a standby state, then the valve body of the leveling reversing valve 300 is controlled to move rightward, so that the oil inlet of the leveling reversing valve 300 is communicated with the working oil port a2, the oil return port of the leveling reversing valve 300 is communicated with the working oil port a1, then the oil pump 200 is controlled to pump hydraulic oil to the oil tank 100, the hydraulic oil passes through the first oil pipe 510 after passing through the oil pump 200, at this time, because the hydraulic oil is introduced into the first oil pipe 510 in advance, the oil pipe 510, so that the oil pressure in the first oil pipe 510 can reach the working state at once and quickly reach the leveling state and can drive the leveling cylinders 400 to lift the leveling platform.
When the telescopic rods of the leveling oil cylinders need to be controlled to retract inwards, the valve bodies of the pressurization reversing valves 610 are controlled to move leftwards, so that the oil inlets of the pressurization reversing valves 610 are communicated with the working oil ports b1, the oil return ports of the pressurization reversing valves 610 are communicated with the working oil ports b2, the pressurization pumps 620 are controlled to pump hydraulic oil to the oil tank 100, the hydraulic oil passes through the pressurization pumps 620 and then is led into the second oil pipe 520 through the second connecting pipeline 551, so that the oil pressure in the second oil pipe 520 is effectively lifted and kept in a standby state, then the valve bodies of the leveling reversing valves 300 are controlled to move leftwards, so that the oil inlets of the leveling reversing valves 300 are communicated with the working oil ports a1, the oil return ports of the leveling reversing valves 300 are communicated with the working oil ports a2, then the oil pumps 200 are controlled to pump the hydraulic oil to the oil tank 100, the hydraulic oil is led into the second oil pipes 520 after passing through the oil pumps 200, at the second oil pipes 520 are pre-pumped with the hydraulic oil, so that the oil pressure in the second oil pipes 520 can reach the working state immediately and can be quickly led into the rod cavities of the leveling oil cylinders 400, and further, so that the leveling telescopic rods of the leveling oil cylinders 400 at different positions can effectively retract inwards, and the lifting platform is driven to perform leveling operation in the opposite direction.
In this embodiment, the leveling directional valve 300 and the pressurization directional valve 610 are all set as three-position four-way electromagnetic directional valves, electromagnets are disposed on two sides of the valve body, and the electromagnets on the corresponding sides attract the valve body to realize the left and right movement of the valve body.
In this embodiment, the first connection pipeline 541 is provided with a first check valve 542, and the first check valve 542 is configured to be unidirectionally conducted from the working oil port b1 of the pressure boosting reversing valve 610 to the first oil pipe 510, so as to prevent the hydraulic oil in the first oil pipe 510 from flowing back to the pressure boosting reversing valve 610 through the first connection pipeline 541; the second connecting line 551 is provided with a second check valve 552, and the second check valve 552 is configured to be unidirectionally conducted from the working oil port b1 of the pressure boosting reversing valve 610 to the direction of the second oil pipe 520, so that the hydraulic oil in the second oil pipe 520 can be prevented from flowing back to the pressure boosting reversing valve 610 through the second connecting line 551.
Further, the hydraulic leveling system further comprises a constant flow valve 630, an oil outlet of the booster pump 620 is communicated with an oil inlet of the constant flow valve 630, and an oil outlet of the constant flow valve 630 is communicated with an oil inlet of the booster reversing valve 610 through a third oil pipe 530. The provision of constant flow valve 630 enables the oil in third oil pipe 530 to be regulated efficiently and reliably according to actual conditions.
Further, the hydraulic leveling system further comprises an overflow valve 640, an oil inlet of the overflow valve 640 is communicated with the third oil pipe 530, and an oil outlet of the overflow valve 640 is communicated with the oil tank 100. Through setting up overflow valve 640, can keep the invariant of the interior oil pressure of third oil pipe 530 when booster pump 620 carries out the pump oil, avoid third oil pipe 530 interior oil pressure too big, effectively protect third oil pipe 530.
Further, with continued reference to fig. 1, the hydraulic leveling system further includes a first bidirectional balance valve 700, the first bidirectional balance valve 700 includes a first switch valve 710 and a second switch valve 720, the first switch valve 710 is disposed on the first oil pipe 510 between the working oil port a1 of the leveling reversing valve 300 and the rod chamber of the adjacent leveling cylinder 400, and the second switch valve 720 is disposed on the second oil pipe 520 between the working oil port a2 of the leveling reversing valve 300 and the rodless chamber of the adjacent leveling cylinder 400. Specifically, when the leveling work is performed, the first switching valve 710 is opened to conduct the portion of the first oil pipe 510 between the working oil port a1 of the leveling and reversing valve 300 and the rod chamber of the adjacent leveling cylinder 400, and the second switching valve 720 is opened to conduct the second oil pipe 520 between the working oil port a2 of the leveling and reversing valve 300 and the rod chamber of the adjacent leveling cylinder 400; when the leveling work is completed, the first switch valve 710 is closed to cut off the conduction of the part of the first oil pipe 510, and the second switch valve 720 is closed to cut off the conduction of the part of the second oil pipe 520, so as to prevent the hydraulic oil from continuing to flow, and the lifting platform can be reliably kept at the leveled position.
Further, the hydraulic leveling system further includes a second bidirectional balancing valve 800, the second bidirectional balancing valve 800 is disposed between two adjacent leveling cylinders 400, the second bidirectional balancing valve 800 includes a third on-off valve 810 and a fourth on-off valve 820, the third on-off valve 810 is disposed on the first oil pipe 510 between the rod chamber of one of the leveling cylinders 400 and the rod chamber of the other leveling cylinder 400, and the fourth on-off valve 820 is disposed on the second oil pipe 520 between the rodless chamber of one of the leveling cylinders 400 and the rodless chamber of the other leveling cylinder 400. Specifically, when the leveling work is performed, the third switching valve 810 is opened to communicate the portion of the first oil pipe 510 between the rod chambers of the adjacent two leveling cylinders 400, and the fourth switching valve 820 is opened to communicate the portion of the second oil pipe 520 between the rod chambers of the adjacent two leveling cylinders 400; when the leveling work is completed, the third switching valve 810 is closed to cut off the conduction of the part of the first oil pipe 510, and the fourth switching valve 820 is closed to cut off the conduction of the part of the second oil pipe 520, so that the hydraulic oil is further prevented from continuously flowing in cooperation with the first bidirectional balancing valve 700 to ensure that the lifting platform is reliably kept at the leveled position.
It should be understood that the above-described embodiments of the present invention are merely examples for clearly illustrating the present invention and are not intended to limit the embodiments of the present invention. Numerous obvious variations, adaptations and substitutions will occur to those skilled in the art without departing from the scope of the invention. And are neither required nor exhaustive of all embodiments. Any modification, equivalent replacement, and improvement made within the spirit and principle of the present invention should be included in the protection scope of the claims of the present invention.
Claims (10)
1. A hydraulic leveling system comprises an oil tank (100), an oil pump (200), a leveling reversing valve (300) and a plurality of leveling oil cylinders (400), wherein the oil tank (100) is communicated with an oil inlet of the oil pump (200), an oil outlet of the oil pump (200) is communicated with an oil inlet of the leveling reversing valve (300), two working oil ports of the leveling reversing valve (300) are respectively communicated with a rod cavity and a rodless cavity of the leveling oil cylinders (400) in sequence through a first oil pipe (510) and a second oil pipe (520), and the hydraulic leveling system is characterized by further comprising a pressurizing reversing valve (610) and a booster pump (620); wherein,
adjacent two all be provided with between leveling cylinder (400) pressure boost switching-over valve (610), the oil inlet of pressure boost switching-over valve (610) passes through pressure boost pump (620) intercommunication oil tank (100), two working oil mouths of pressure boost switching-over valve (610) communicate respectively first oil pipe (510) with second oil pipe (520).
2. The hydraulic leveling system as recited in claim 1 further comprising a constant flow valve (630), an oil outlet of the boost pump (620) being in communication with an oil inlet of the constant flow valve (630), an oil outlet of the constant flow valve (630) being in communication with an oil inlet of the boost reversing valve (610) through a third oil pipe (530).
3. The hydraulic leveling system according to claim 2, further comprising a relief valve (640), an oil inlet of the relief valve (640) being communicated with the third oil pipe (530), and an oil outlet of the relief valve (640) being communicated with the oil tank (100).
4. The hydraulic leveling system according to claim 1, wherein a working oil port b1 of the pressure boosting reversing valve (610) is communicated with the first oil pipe (510) through a first connecting pipeline (541), a first check valve (542) is arranged on the first connecting pipeline (541), and the first check valve (542) is configured to be communicated in a one-way manner from the working oil port b1 of the pressure boosting reversing valve (610) to the first oil pipe (510).
5. The hydraulic leveling system according to claim 1, wherein a working oil port b2 of the pressure boosting reversing valve (610) is communicated with the second oil pipe (520) through a second connecting pipeline (551), a second one-way valve (552) is arranged on the second connecting pipeline (551), and the second one-way valve (552) is configured to be in one-way communication from the working oil port b1 of the pressure boosting reversing valve (610) to the direction of the second oil pipe (520).
6. The hydraulic leveling system according to claim 1, further comprising a first bidirectional balance valve (700), wherein the first bidirectional balance valve (700) comprises a first switch valve (710) and a second switch valve (720), the first switch valve (710) is disposed on the first oil pipe (510) between the working oil port a1 of the leveling reversing valve (300) and the rod chamber of the adjacent leveling cylinder (400), and the second switch valve (720) is disposed on the second oil pipe (520) between the working oil port a2 of the leveling reversing valve (300) and the rod-free chamber of the adjacent leveling cylinder (400).
7. The hydraulic leveling system according to claim 1, further comprising a second bidirectional balancing valve (800), the second bidirectional balancing valve (800) being disposed between two adjacent leveling cylinders (400), the second bidirectional balancing valve (800) comprising a third on-off valve (810) and a fourth on-off valve (820), the third on-off valve (810) being disposed on the first oil pipe (510) between the rod chamber of one of the leveling cylinders (400) and the rod chamber of the other leveling cylinder (400), the fourth on-off valve (820) being disposed on the second oil pipe (520) between the rodless chamber of one of the leveling cylinders (400) and the rodless chamber of the other leveling cylinder (400).
8. The hydraulic leveling system of claim 1, wherein the booster directional valve (610) is configured as a solenoid directional valve.
9. The hydraulic leveling system according to claim 1, wherein the leveling directional valve (300) is provided as a solenoid directional valve.
10. An aerial work platform comprising a lifting platform, characterized in that it further comprises a hydraulic leveling system according to any one of claims 1 to 9, the telescopic rods of the leveling cylinders (400) being connected to the lifting platform.
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| CN202211575707.6A CN115653957B (en) | 2022-12-09 | 2022-12-09 | Hydraulic leveling system and aerial work platform |
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| CN116892550B (en) * | 2023-09-08 | 2023-12-19 | 临工重机股份有限公司 | Workbench leveling method |
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