CN115231485A - Leveling hydraulic control system and aerial work platform - Google Patents
Leveling hydraulic control system and aerial work platform Download PDFInfo
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- CN115231485A CN115231485A CN202210841200.4A CN202210841200A CN115231485A CN 115231485 A CN115231485 A CN 115231485A CN 202210841200 A CN202210841200 A CN 202210841200A CN 115231485 A CN115231485 A CN 115231485A
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- 239000003921 oil Substances 0.000 claims abstract description 501
- 239000010720 hydraulic oil Substances 0.000 claims abstract description 86
- 230000001502 supplementing effect Effects 0.000 claims abstract description 63
- 230000001603 reducing effect Effects 0.000 claims description 109
- 238000013016 damping Methods 0.000 claims description 6
- 238000000034 method Methods 0.000 description 8
- 239000013589 supplement Substances 0.000 description 7
- 238000010586 diagram Methods 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 2
- 238000004904 shortening Methods 0.000 description 2
- 230000003111 delayed effect Effects 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B66—HOISTING; LIFTING; HAULING
- B66F—HOISTING, LIFTING, HAULING OR PUSHING, NOT OTHERWISE PROVIDED FOR, e.g. DEVICES WHICH APPLY A LIFTING OR PUSHING FORCE DIRECTLY TO THE SURFACE OF A LOAD
- B66F11/00—Lifting devices specially adapted for particular uses not otherwise provided for
- B66F11/04—Lifting devices specially adapted for particular uses not otherwise provided for for movable platforms or cabins, e.g. on vehicles, permitting workmen to place themselves in any desired position for carrying out required operations
- B66F11/044—Working platforms suspended from booms
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B66—HOISTING; LIFTING; HAULING
- B66F—HOISTING, LIFTING, HAULING OR PUSHING, NOT OTHERWISE PROVIDED FOR, e.g. DEVICES WHICH APPLY A LIFTING OR PUSHING FORCE DIRECTLY TO THE SURFACE OF A LOAD
- B66F13/00—Common constructional features or accessories
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B66—HOISTING; LIFTING; HAULING
- B66F—HOISTING, LIFTING, HAULING OR PUSHING, NOT OTHERWISE PROVIDED FOR, e.g. DEVICES WHICH APPLY A LIFTING OR PUSHING FORCE DIRECTLY TO THE SURFACE OF A LOAD
- B66F17/00—Safety devices, e.g. for limiting or indicating lifting force
- B66F17/006—Safety devices, e.g. for limiting or indicating lifting force for working platforms
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B11/00—Servomotor systems without provision for follow-up action; Circuits therefor
- F15B11/16—Servomotor systems without provision for follow-up action; Circuits therefor with two or more servomotors
- F15B11/161—Servomotor systems without provision for follow-up action; Circuits therefor with two or more servomotors with sensing of servomotor demand or load
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B13/00—Details of servomotor systems ; Valves for servomotor systems
- F15B13/02—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors
- F15B13/06—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors for use with two or more servomotors
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Structural Engineering (AREA)
- Life Sciences & Earth Sciences (AREA)
- Geology (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- General Engineering & Computer Science (AREA)
- Forklifts And Lifting Vehicles (AREA)
- Fluid-Pressure Circuits (AREA)
Abstract
The invention discloses a leveling hydraulic control system and an aerial work platform, comprising: a main oil passage; the leveling oil way comprises a first leveling oil cylinder, a second leveling oil cylinder, a first balance valve and a second balance valve, wherein a rodless cavity of the first leveling oil cylinder and a rodless cavity of the second leveling oil cylinder are communicated with a first oil port of the main oil way; and the pressure supplementing oil way is used for supplementing hydraulic oil into the leveling oil way so as to keep the pressure value in the leveling oil way at a preset pressure value.
Description
Technical Field
The invention relates to the technical field of aerial work, in particular to a leveling hydraulic control system and an aerial work platform.
Background
In the technical field of high-altitude operation, when the boom of the high-altitude operation vehicle is subjected to amplitude variation, in order to ensure the safety of an operator standing on a high-altitude operation platform, when the boom of the high-altitude operation vehicle is subjected to amplitude variation, the high-altitude operation platform connected with the boom is usually leveled through a leveling hydraulic control system. The traditional leveling hydraulic control system has the problem of leveling lag, so that the aerial work platform cannot be kept level all the time when the arm support performs amplitude variation.
Disclosure of Invention
The present invention is directed to solving at least one of the problems of the prior art. Therefore, the invention provides a leveling hydraulic control system which can enable an aerial work platform to be always kept horizontal when an arm support performs amplitude variation.
The invention also provides an aerial work platform with the leveling hydraulic control system.
According to an embodiment of the first aspect of the invention, the leveling hydraulic control system includes: a main oil passage; the leveling oil circuit comprises a first leveling oil cylinder, a second leveling oil cylinder, a first balancing valve and a second balancing valve, wherein the first leveling oil cylinder and the second leveling oil cylinder are used for leveling an aerial work platform, a rodless cavity of the first leveling oil cylinder is communicated with a rodless cavity of the second leveling oil cylinder, a rod cavity of the first leveling oil cylinder is communicated with a rod cavity of the second leveling oil cylinder, a rodless cavity of the first leveling oil cylinder and a rodless cavity of the second leveling oil cylinder are communicated with a first oil port of the main oil circuit, a rod cavity of the first leveling oil cylinder and a rod cavity of the second leveling oil cylinder are communicated with a second oil port of the main oil circuit, an oil inlet of the first balancing valve is communicated with a rodless cavity of the second leveling oil cylinder, an oil outlet of the first balancing valve is communicated with a first oil port of the main oil circuit, an oil inlet of the second balancing valve is communicated with a rod cavity of the second leveling oil cylinder, and an oil outlet of the second balancing valve is communicated with a second oil port of the main oil circuit; a first oil port of the pressure supplementing oil way is communicated with a third oil port of the main oil way, a rodless cavity of the first leveling oil cylinder and a rodless cavity of the second leveling oil cylinder are both communicated with a second oil port of the pressure supplementing oil way, and a rod cavity of the first leveling oil cylinder and a rod cavity of the second leveling oil cylinder are both communicated with the third oil port of the pressure supplementing oil way; the pressure supplementing oil way is used for supplementing hydraulic oil into the leveling oil way so as to enable the pressure value in the leveling oil way to keep a preset pressure value.
The leveling hydraulic control system provided by the embodiment of the invention at least has the following beneficial effects:
in the leveling hydraulic control system, the rodless cavity of the first leveling cylinder and the rodless cavity of the second leveling cylinder are both communicated with the first oil port of the main oil way, and the rod cavity of the first leveling cylinder and the rod cavity of the second leveling cylinder are both communicated with the second oil port of the main oil way, so that when the arm support becomes larger in amplitude upwards, the arm support can drive the first leveling cylinder to extend out, at the moment, hydraulic oil can simultaneously enter the rodless cavity of the first leveling cylinder and the rodless cavity of the second leveling cylinder from the first oil port of the main oil way, the second leveling cylinder also extends out, and the aerial work platform inclines upwards. Because the rod cavity of the first leveling cylinder is communicated with the rod cavity of the second leveling cylinder, when the first leveling cylinder extends out, hydraulic oil in the rod cavity of the first leveling cylinder can enter the rod cavity of the second leveling cylinder, so that the pressure in the rod-free cavity of the second leveling cylinder is increased, a first balance valve connected with the rod-free cavity of the second leveling cylinder can be further opened, and hydraulic oil in the rod-free cavity of the second leveling cylinder can flow out of the second leveling cylinder through the first balance valve, so that the second leveling cylinder contracts, and the upward inclined aerial work platform can be leveled. Similarly, when the boom changes the amplitude downwards, the boom can drive the first leveling cylinder to contract, at the moment, hydraulic oil can simultaneously enter the rodless cavity of the first leveling cylinder and the rodless cavity of the second leveling cylinder from the second oil port of the main oil way, and then the second leveling cylinder also contracts, so that the aerial work platform inclines downwards. Because the rodless cavity of the first leveling cylinder is communicated with the rodless cavity of the second leveling cylinder, when the first leveling cylinder contracts, hydraulic oil in the rodless cavity of the first leveling cylinder can enter the rodless cavity of the second leveling cylinder, so that the pressure in the rod cavity of the second leveling cylinder is increased, a second balance valve connected with the rod cavity of the second leveling cylinder can be further opened, and hydraulic oil in the rod cavity of the second leveling cylinder can flow out of the second leveling cylinder through the second balance valve, so that the second leveling cylinder extends out, and therefore a downward-inclined aerial work platform can be leveled.
In the process of leveling the aerial work platform, a first balance valve connected with a rodless cavity of a second leveling cylinder and a second balance valve connected with a rod cavity of the second leveling cylinder both need certain pressure to be opened, so that the aerial work platform cannot be in a horizontal state before the first balance valve or the second balance valve is opened, and the aerial work platform can generate a leveling lag phenomenon in the process of upward amplitude variation or downward amplitude variation of an arm support. At the moment, the pressure supplementing oil circuit communicated with the leveling oil circuit can supplement hydraulic oil into the leveling oil circuit, so that the pressure supplementing oil circuit can supplement the hydraulic oil into the leveling oil circuit, the pressure value in the leveling oil circuit is kept at the preset pressure value, the time for the opening pressure of the first balance valve or the second balance valve in the leveling oil circuit to reach can be shortened, the problem of leveling lag of the aerial work platform is avoided, and the aerial work platform can be always in a horizontal state. In the process that the second leveling oil cylinder replenishes hydraulic oil into the pressure replenishing oil circuit, because the first oil port of the pressure replenishing oil circuit is communicated with the third oil port of the main oil circuit, the second oil port of the pressure replenishing oil circuit is communicated with the rodless cavity of the first leveling oil cylinder and the rodless cavity of the second leveling oil cylinder, and the third oil port of the pressure replenishing oil circuit is communicated with the rod cavity of the first leveling oil cylinder and the rod cavity of the second leveling oil cylinder, the hydraulic oil in the main oil circuit can be replenished into the leveling oil circuit through the first oil port of the pressure replenishing oil circuit, the second oil port of the pressure replenishing oil circuit and the third oil port of the pressure replenishing oil circuit, so that the pressure in the leveling oil circuit is improved, the aim of shortening the reaching time of the opening pressure of the first balance valve or the second balance valve in the leveling oil circuit is fulfilled, the situation that the high-altitude operation platform is delayed, and the high-altitude operation platform can be always in a horizontal state is avoided.
According to some embodiments of the present invention, the pressure compensating oil path includes a safety valve, a pressure reducing valve, a first pipeline and a second pipeline, a first end of the first pipeline is communicated with a first oil port of the pressure compensating oil path, a second end of the first pipeline is communicated with a second oil port of the pressure compensating oil path, a first end of the second pipeline is communicated with the first pipeline, a second end of the second pipeline is communicated with a third oil port of the pressure compensating oil path, the pressure reducing valve and the safety valve are both disposed between the second end of the second pipeline and the first oil port of the pressure compensating oil path, and the pressure reducing valve is disposed on the first pipeline;
the oil inlet of the pressure reducing valve is communicated with the first oil port of the pressure supplementing oil way, the second oil port of the pressure supplementing oil way and the third oil port of the pressure supplementing oil way are communicated with the oil outlet of the pressure reducing valve, the oil inlet of the safety valve is communicated with the first pipeline, and the oil outlet of the safety valve is communicated with an oil tank.
According to some embodiments of the invention, the safety valve is arranged between the pressure reducing valve and the first oil port of the pressure supplementing oil way, and the first oil port of the pressure supplementing oil way and the oil inlet of the pressure reducing valve are both communicated with the oil inlet of the safety valve.
According to some embodiments of the present invention, a first orifice and a second orifice are disposed on the first pipeline, the first orifice is disposed between the safety valve and the first port of the pressure compensating oil path, and the second orifice is disposed between the safety valve and the pressure reducing valve.
According to some embodiments of the invention, the safety valve is a one-way valve.
According to some embodiments of the invention, the relief valve is a relief valve.
According to some embodiments of the invention, the pressure reducing valve is arranged between the safety valve and the first oil port of the pressure supplementing oil circuit, and an oil outlet of the pressure reducing valve is communicated with an oil inlet of the safety valve.
According to some embodiments of the invention, the pressure compensating oil circuit further comprises a constant flow valve, the constant flow valve is arranged on the first pipeline, a first oil port of the constant flow valve is communicated with a first oil port of the pressure compensating oil circuit, and a second oil port of the constant flow valve is communicated with an oil inlet of the pressure reducing valve.
According to some embodiments of the invention, the pressure compensating oil way further comprises a first check valve, the first check valve is arranged on the first pipeline, and the first check valve is arranged between the first end of the second pipeline and the second oil port of the pressure compensating oil way;
the pressure supplementing oil way further comprises a second one-way valve, the second one-way valve is arranged on the second pipeline, and the second one-way valve is arranged between the first end of the second pipeline and a third oil port of the pressure supplementing oil way.
According to a second aspect of the invention, an aerial work platform comprises: the leveling hydraulic control system as described above.
The aerial work platform provided by the embodiment of the invention at least has the following beneficial effects:
in the aerial work platform, the leveling hydraulic control system can shorten the time for the opening pressure of the first balance valve or the second balance valve in the leveling oil circuit to reach, so that the problem of leveling lag of the aerial work platform is avoided, and the aerial work platform can be always in a horizontal state.
Drawings
The invention is further described with reference to the following figures and examples, in which:
fig. 1 is a schematic structural diagram of a leveling hydraulic control system according to a first embodiment of the invention;
fig. 2 is a schematic structural diagram of a leveling hydraulic control system according to a second embodiment of the present invention;
fig. 3 is a schematic structural diagram of a leveling hydraulic control system according to a third embodiment of the present invention.
Reference numbers:
100. a main oil path;
200. leveling an oil way; 210. a first leveling cylinder; 220. a second leveling cylinder; 230. a first counter-balance valve; 240. a second balancing valve;
300. a pressure supplementing oil way; 310. a safety valve; 320. a pressure reducing valve; 330. a first pipeline; 331. a first orifice; 332. a second orifice; 340. a second pipeline; 350. a constant flow valve; 360. a first check valve; 370. a second check valve;
400. and an oil tank.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are illustrative only for the purpose of explaining the present invention, and are not to be construed as limiting the present invention.
In the description of the present invention, it should be understood that the orientation descriptions, such as the orientation or positional relationship indicated by upper, lower, etc., are based on the orientation or positional relationship shown in the drawings, and are only for convenience of description and simplification of the description, but do not indicate or imply that the device or element referred to must have a particular orientation, be constructed in a particular orientation, and be operated, and thus should not be construed as limiting the present invention.
In the description of the present invention, a plurality means two or more. If the first and second are described for the purpose of distinguishing technical features, they are not to be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated or implicitly indicating the precedence of the technical features indicated.
In the description of the present invention, unless otherwise explicitly limited, terms such as arrangement, installation, connection and the like should be understood in a broad sense, and those skilled in the art can reasonably determine the specific meanings of the above terms in the present invention in combination with the specific contents of the technical solutions.
Referring to fig. 1 and 3, a leveling hydraulic control system according to an embodiment of the present invention includes: a main oil path 100, a leveling oil path 200, and a pressure compensating oil path 300.
Specifically, the leveling oil path 200 includes a first leveling oil cylinder 210, a second leveling oil cylinder 220, a first balancing valve 230 and a second balancing valve 240, the first leveling oil cylinder 210 and the second leveling oil cylinder 220 are both used for leveling an aerial work platform, a rodless cavity of the first leveling oil cylinder 210 is communicated with a rodless cavity of the second leveling oil cylinder 220, a rod cavity of the first leveling oil cylinder 210 is communicated with a rod cavity of the second leveling oil cylinder 220, the rodless cavity of the first leveling oil cylinder 210 and the rodless cavity of the second leveling oil cylinder 220 are both communicated with a first oil port a of the main oil path 100, the rod cavity of the first leveling oil cylinder 210 and the rod cavity of the second leveling oil cylinder 220 are both communicated with a second oil port b of the main oil path 100, an oil inlet of the first balancing valve 230 is communicated with the rodless cavity of the second leveling oil cylinder 220, an oil outlet of the first balancing valve 230 is communicated with a first oil port a of the main oil path 100, an oil inlet of the second balancing valve 240 is communicated with a rod cavity of the second leveling oil port of the second leveling oil cylinder 220, and an oil port of the second balancing valve 240 b of the main oil path 100; the first oil port d of the pressure compensating oil path 300 is communicated with the third oil port c of the main oil path 100, the rodless cavity of the first leveling cylinder 210 and the rodless cavity of the second leveling cylinder 220 are both communicated with the second oil port e of the pressure compensating oil path 300, and the rod cavity of the first leveling cylinder 210 and the rod cavity of the second leveling cylinder 220 are both communicated with the third oil port f of the pressure compensating oil path 300; the pressure compensating oil path 300 is configured to compensate hydraulic oil into the leveling oil path 200, so that a pressure value in the leveling oil path 200 is maintained at a preset pressure value.
More specifically, the preset pressure needs to satisfy the condition that the first balance valve 230 and the second balance valve 240 in the leveling oil path 200 cannot be opened when the boom does not start luffing, so as to prevent the aerial work platform from tipping over due to the opening of the first balance valve 230 and the second balance valve 240 in the leveling oil path 200 when the boom does not start luffing.
Further, the pipeline of the leveling oil path 200 and the pipeline of the pressure compensating oil path 300 both adopt small-diameter rubber hoses, and the pressure of the hydraulic oil can be increased when the hydraulic oil flows through the small-diameter rubber hoses, so that the opening time of the balance valve can be further shortened.
Further, the first leveling cylinder 210 is a lower leveling cylinder, the second leveling cylinder 220 is an upper leveling cylinder, and the boom can drive the lower leveling cylinder to extend and retract when the boom changes its amplitude.
In the leveling hydraulic control system, because the rodless cavity of the first leveling cylinder 210 and the rodless cavity of the second leveling cylinder 220 are both communicated with the first oil port a of the main oil path 100, and the rod cavity of the first leveling cylinder 210 and the rod cavity of the second leveling cylinder 220 are both communicated with the second oil port b of the main oil path 100, when the boom becomes upward in amplitude, the boom can drive the first leveling cylinder 210 to extend out, at the moment, hydraulic oil can simultaneously enter the rodless cavity of the first leveling cylinder 210 and the rodless cavity of the second leveling cylinder 220 from the first oil port a of the main oil path 100, and then the second leveling cylinder 220 also extends out of the aerial work platform to tilt upward. Because the rod cavity of the first leveling cylinder 210 is communicated with the rod cavity of the second leveling cylinder 220, when the first leveling cylinder 210 extends, hydraulic oil in the rod cavity of the first leveling cylinder 210 can enter the rod cavity of the second leveling cylinder 220, so that the pressure in the rodless cavity of the second leveling cylinder 220 is increased, further, the first balance valve 230 connected with the rodless cavity of the second leveling cylinder 220 can be opened, hydraulic oil in the rodless cavity of the second leveling cylinder 220 can flow out of the second leveling cylinder 220 through the first balance valve, so that the second leveling cylinder 220 is contracted, and thus, an overhead working platform which inclines upwards can be leveled. Similarly, when the boom becomes lower in amplitude, the boom can drive the first leveling cylinder 210 to contract, the hydraulic oil can simultaneously enter the rodless cavity of the first leveling cylinder 210 and the rodless cavity of the second leveling cylinder 220 from the second oil port b of the main oil path 100, and then the second leveling cylinder 220 also contracts, so that the aerial work platform inclines downwards. Because the rodless cavity of the first leveling cylinder 210 is communicated with the rodless cavity of the second leveling cylinder 220, when the first leveling cylinder 210 contracts, hydraulic oil in the rodless cavity of the first leveling cylinder 210 can enter the rodless cavity of the second leveling cylinder 220, so that the pressure in the rod cavity of the second leveling cylinder 220 is increased, further, a second balance valve 240 connected with the rod cavity of the second leveling cylinder 220 can be opened, and hydraulic oil in the rod cavity of the second leveling cylinder 220 can flow out of the second leveling cylinder 220 through the second balance valve 240, so that the second leveling cylinder 220 extends out, and thus, a downward-inclined aerial work platform can be leveled.
In the process of leveling the aerial work platform, the first balance valve 230 connected with the rodless cavity of the second leveling cylinder 220 and the second balance valve 240 connected with the rod cavity of the second leveling cylinder 220 both need a certain pressure to be opened, so that the aerial work platform cannot be in a horizontal state before the first balance valve 230 or the second balance valve 240 is opened, and the aerial work platform has a leveling lag phenomenon in the process of upward luffing or downward luffing of the boom. At this time, the pressure compensating oil path 300 communicated with the leveling oil path 200 can compensate hydraulic oil into the leveling oil path 200, so that the pressure compensating oil path 300 can compensate hydraulic oil into the leveling oil path 200, so that the pressure value in the leveling oil path 200 is kept at the preset pressure value, and the time for the opening pressure of the first balance valve 230 or the second balance valve 240 in the leveling oil path 200 to reach can be shortened, thereby avoiding the problem of leveling delay of the aerial work platform, and enabling the aerial work platform to be in a horizontal state all the time. In the process that the second leveling oil cylinder 220 supplements the hydraulic oil to the pressure supplementing oil path 300, because the first oil port d of the pressure supplementing oil path 300 is communicated with the third oil port c of the main oil path 100, the second oil port e of the pressure supplementing oil path 300 is communicated with the rodless cavity of the first leveling oil cylinder 210 and the rodless cavity of the second leveling oil cylinder 220, and the third oil port f of the pressure supplementing oil path 300 is communicated with the rod cavity of the first leveling oil cylinder 210 and the rod cavity of the second leveling oil cylinder 220, the hydraulic oil in the main oil path 100 can be supplemented to the leveling oil path 200 through the first oil port d of the pressure supplementing oil path 300, the second oil port e of the pressure supplementing oil path 300 and the third oil port f of the pressure supplementing oil path 300, so as to improve the pressure in the leveling oil path 200, achieve the purpose that the opening pressure reaching time of the first balancing valve 230 or the second balancing valve 240 in the leveling oil path 200 can be shortened, avoid the high-altitude work platform from lagging, and enable the high-altitude work platform to be in a horizontal state all the time.
Referring to fig. 1 to 3, it can be understood that the pressure compensating oil path 300 includes a relief valve 310, a pressure reducing valve 320, a first pipeline 330 and a second pipeline 340, a first end of the first pipeline 330 is communicated with a first port d of the pressure compensating oil path 300, a second end of the first pipeline 330 is communicated with a second port e of the pressure compensating oil path 300, a first end of the second pipeline 340 is communicated with the first pipeline 330, a second end of the second pipeline 340 is communicated with a third port f of the pressure compensating oil path 300, the pressure reducing valve 320 and the relief valve 310 are both disposed between the second end of the second pipeline 340 and the first port d of the pressure compensating oil path 300, and the pressure reducing valve 320 is disposed on the first pipeline 330; an oil inlet of the pressure reducing valve 320 is communicated with a first port d of the pressure supplementing oil path 300, a second port e of the pressure supplementing oil path 300 and a third port f of the pressure supplementing oil path 300 are both communicated with an oil outlet of the pressure reducing valve 320, an oil inlet of the safety valve 310 is communicated with the first pipeline 330, and an oil outlet of the safety valve 310 is used for being communicated with the oil tank 400.
Thus, the hydraulic oil entering the pressure compensating oil path 300 from the third oil port c of the main oil path 100 can enter the first pipeline 330 and the second pipeline 340, and then flow to the leveling oil path 200 through the first pipeline 330 and the second pipeline 340, so as to achieve the purpose of supplementing the hydraulic oil to the leveling oil path 200, and the pressure in the leveling oil path 200 can maintain the preset pressure value. In this process, the pressure reducing valve 320 provided on the first line 330 can function to reduce the pressure of the hydraulic oil in the pressure-replenishing oil passage 300, preventing the pressure of the hydraulic oil flowing from the pressure-replenishing oil passage 300 into the leveling oil passage 200 from being excessive. The relief valve 310 provided between the second end of the second line 340 and the first port d of the pressure-replenishing oil path 300 functions to maintain the oil pressure of the hydraulic oil in the pressure-replenishing oil path 300.
It should be noted that the pressure of the hydraulic oil entering the pressure reducing valve 320 from the oil inlet of the pressure reducing valve 320 can be reduced to the preset pressure value of the pressure reducing valve 320 by the action of the pressure reducing valve 320, and flows out from the oil outlet of the pressure reducing valve 320. When the pressure of the hydraulic oil at the oil outlet of the pressure reducing valve 320 is less than or equal to the preset pressure value of the pressure reducing valve 320, the pressure reducing valve 320 normally performs pressure reducing work; when the pressure of the hydraulic oil at the oil outlet of the pressure reducing valve 320 is greater than the preset pressure value of the pressure reducing valve 320, the pressure reducing valve 320 will be locked to stop the pressure reducing operation, and at this time, the pressure reducing valve 320 is used as a passage without a pressure reducing function.
Further, in some embodiments, the pressure reducing valve 320 is an overflow type pressure reducing valve 320, when the pressure reducing valve 320 is locked and stops reducing pressure, an overflow port of the pressure reducing valve 320 is opened due to an excessive pressure in the pressure reducing valve 320, and at this time, the hydraulic oil in the pressure reducing valve 320 flows out of the pressure reducing valve 320 through the overflow port, so as to achieve the purpose of relieving pressure inside the pressure reducing valve 320, and the pressure reducing valve 320 returns to a normal pressure reducing state until the pressure of the hydraulic oil at an oil outlet of the pressure reducing valve 320 is less than or equal to a preset pressure value of the pressure reducing valve 320.
The first embodiment is as follows:
referring to fig. 1, it can be understood that the relief valve 310 is disposed between the pressure reducing valve 320 and the first port d of the pressure supplementing oil path 300, and the first port d of the pressure supplementing oil path 300 and the oil inlet of the pressure reducing valve 320 are both communicated with the oil inlet of the relief valve 310.
It should be noted that, when the pressure reducing valve 320 works normally, the safety valve 310 serves as a back pressure valve, and at this time, the hydraulic oil flowing from the third port c of the main oil path 100 to the first port d of the pressure compensating oil path 300 enters the oil inlet of the pressure reducing valve 320 and the oil inlet of the safety valve 310 respectively. At this time, the relief valve 320 performs a normal relief operation, and the relief valve 310 receives a back pressure of the hydraulic oil from the first port d of the pressure-compensating oil path 300. When the pressure of the oil inlet of the safety valve 310 is smaller than the opening pressure of the safety valve 310, the safety valve 310 is in a closed state, at this time, the pressure of the hydraulic oil entering the oil inlet of the pressure reducing valve 320 is gradually increased, and when the pressure of the oil inlet of the safety valve 310 is greater than or equal to the opening pressure of the safety valve 310, the safety valve 310 is opened, at this time, the hydraulic oil in the oil inlet of the safety valve 310 can enter the oil tank 400 through the oil outlet of the safety valve 310, so that the pressure of the hydraulic oil entering the pressure supplementing oil path 300 from the first oil port d of the pressure supplementing oil path 300 is always kept constant. In this way, the safety valve 310 can determine the pressure of the hydraulic oil entering the oil inlet of the pressure reducing valve 320, so that the pressure entering the oil inlet of the pressure reducing valve 320 always depends on the opening pressure of the safety valve 310, that is, the pressure value supplemented into the leveling oil path 200 by the pressure supplementing oil path 300 always depends on the opening pressure of the safety valve 310.
Further, when the pressure reducing valve 320 stops operating, the relief valve 310 functions as a relief valve, preventing the pressure of the hydraulic oil flowing from the pressure-replenishing oil passage 300 to the leveling oil passage 200 from becoming excessive.
In this way, the hydraulic oil introduced from the third port c of the main oil passage 100 into the first port d of the pressure-replenishing oil passage 300 can be introduced into the oil inlet of the relief valve 310 and the oil inlet of the pressure-reducing valve 320, respectively. The hydraulic oil in the oil inlet of the pressure reducing valve 320 is reduced to a preset pressure value of the pressure reducing valve 320 through the pressure reducing function of the pressure reducing valve 320, then flows to the second oil port b of the main oil circuit 100 and the third oil port c of the main oil circuit 100 through the oil outlet of the pressure reducing valve 320, finally flows to the rodless cavity of the second leveling cylinder 220 and the rodless cavity of the first leveling cylinder 210 through the second oil port b of the main oil circuit 100, and flows to the rod cavity of the second leveling cylinder 220 and the rod cavity of the first leveling cylinder 210 through the third oil port c of the main oil circuit 100, so that the preset pressure value is always maintained in the leveling oil circuit 200, the leveling time of the aerial work platform is shortened, and the aerial work platform can be always in a horizontal state.
Referring to fig. 1, the first pipe 330 is provided with a first orifice 331 and a second orifice 332, the first orifice 331 is disposed between the relief valve 310 and the first port d of the pressure compensating oil path 300, and the second orifice 332 is disposed between the relief valve 310 and the pressure reducing valve 320.
In this way, the first damping hole 331 provided between the relief valve 310 and the first port d of the pressure-replenishing oil path 300 can alleviate the impact of the hydraulic oil entering the pressure-replenishing oil path 300 from the first port d of the pressure-replenishing oil path 300 on the pressure-replenishing oil path 300. The second damping hole 332 disposed between the safety valve 310 and the pressure reducing valve 320 can further reduce the impact of the hydraulic oil entering the oil inlet of the pressure reducing valve 320 on the pressure reducing valve 320, so as to prevent the pressure reducing valve 320 from being damaged, thereby improving the safety and stability of the leveling hydraulic control system.
Referring to fig. 1, it will be appreciated that the relief valve 310 is a one-way valve.
It should be noted that, when the check valve is used as a back pressure valve, the lowest pressure required by the hydraulic oil entering the check valve from the first oil port of the check valve to push the valve element away is called the opening pressure of the check valve, the opening pressure of the check valve is related to the stiffness of the spring of the check valve, if the stiffness of the spring of the check valve is larger, the check valve can maintain a certain back pressure, and the hydraulic oil can pass through the check valve only after overcoming the spring force, so that the check valve plays a role of the back pressure valve.
Thus, when the pressure reducing valve 320 normally operates, the check valve serves as a back pressure valve, and at this time, the hydraulic oil flowing from the third port c of the main oil path 100 to the first port d of the pressure compensating oil path 300 respectively enters the oil inlet of the pressure reducing valve 320 and the first port of the check valve. At this time, the pressure reducing valve 320 normally performs the pressure reducing operation, and the check valve receives the back pressure of the hydraulic oil from the first port d of the pressure compensating oil path 300. When the pressure of the first oil port of the check valve is smaller than the opening pressure of the check valve, the check valve is in a closed state, at this time, the pressure of the hydraulic oil entering the oil inlet of the pressure reducing valve 320 is gradually increased, and when the pressure of the first oil port of the check valve is greater than or equal to the opening pressure of the check valve, the check valve is opened, at this time, the hydraulic oil in the first oil port of the check valve can enter the oil tank 400 through the second oil port of the check valve, so that the pressure of the hydraulic oil entering the pressure supplementing oil path 300 from the first oil port d of the pressure supplementing oil path 300 is always kept constant. Therefore, the check valve can determine the pressure of the hydraulic oil entering the oil inlet of the pressure reducing valve 320, so that the pressure entering the oil inlet of the pressure reducing valve 320 always depends on the opening pressure of the check valve, that is, the pressure value supplemented into the leveling oil path 200 by the pressure supplementing oil path 300 always depends on the opening pressure of the check valve.
Further, when the pressure reducing valve 320 stops operating, the check valve functions as a relief valve, preventing the pressure of the hydraulic oil flowing from the pressure-replenishing oil passage 300 to the leveling oil passage 200 from becoming excessive.
Example two:
referring to fig. 2, it will be appreciated that the relief valve 310 is a relief valve.
Thus, when the pressure reducing valve 320 normally operates, the overflow valve serves as a back pressure valve, and at this time, the hydraulic oil flowing from the third port c of the main oil passage 100 to the first port d of the pressure compensating oil passage 300 respectively enters the oil inlet of the pressure reducing valve 320 and the first port of the overflow valve. At this time, the relief valve 320 performs a relief operation normally, and the relief valve receives a back pressure of the hydraulic oil from the first port d of the pressure-compensating oil path 300. When the pressure of the first port of the overflow valve is smaller than the opening pressure of the overflow valve, the overflow valve is in a closed state, at this time, the pressure of the hydraulic oil entering the oil inlet of the pressure reducing valve 320 is gradually increased, and when the pressure of the first port of the overflow valve is greater than or equal to the opening pressure of the overflow valve, the overflow valve is opened, at this time, the hydraulic oil in the first port of the overflow valve can enter the oil tank 400 through the second port of the overflow valve, so that the pressure of the hydraulic oil entering the pressure supplementing oil path 300 from the first port d of the pressure supplementing oil path 300 is always kept constant. Therefore, the relief valve can determine the pressure of the hydraulic oil entering the oil inlet of the pressure reducing valve 320, so that the pressure entering the oil inlet of the pressure reducing valve 320 always depends on the opening pressure of the relief valve, that is, the pressure value supplemented into the leveling oil path 200 by the pressure supplementing oil path 300 always depends on the opening pressure of the relief valve.
Further, when the pressure reducing valve 320 stops operating, the relief valve functions as a relief valve, preventing the pressure of the hydraulic oil flowing from the pressure compensating oil passage 300 to the leveling oil passage 200 from becoming excessive.
It should be noted that the opening pressure of the relief valve is greater than the opening pressure of the check valve.
Example three:
referring to fig. 3, it can be understood that a pressure reducing valve 320 is disposed between the relief valve 310 and the first port d of the pressure-replenishing oil path 300, and an oil outlet of the pressure reducing valve 320 communicates with an oil inlet of the relief valve 310.
It should be noted that, when the pressure reducing valve 320 works normally, the safety valve 310 serves as a back pressure valve, and at this time, the hydraulic oil flowing out of the oil outlet of the pressure reducing valve 320 enters the oil inlet of the safety valve 310, the second oil port b of the main oil path 100, and the third oil port c of the main oil path 100. At this time, the pressure reducing valve 320 performs the pressure reducing operation normally, and the relief valve 310 receives the back pressure of the hydraulic oil from the oil outlet of the pressure reducing valve 320. When the pressure of the oil inlet of the safety valve 310 is smaller than the opening pressure of the safety valve 310, the safety valve 310 is in a closed state, at this time, the pressure of the hydraulic oil entering the second port b of the main oil path 100 and the third port c of the main oil path 100 is gradually increased, when the pressure of the oil inlet of the safety valve 310 is greater than or equal to the opening pressure of the safety valve 310, the safety valve 310 is opened, at this time, the hydraulic oil in the oil inlet of the safety valve 310 can enter the oil tank 400 through the oil outlet of the safety valve 310, and thus the pressure of the hydraulic oil entering the second port b of the main oil path 100 and the third port c of the main oil path 100 from the oil outlet of the pressure reducing valve 320 is always kept constant. In this way, the safety valve 310 can determine the pressure of the hydraulic oil entering the second port b of the main oil path 100 and the third port c of the main oil path 100, so that the pressure entering the second port b of the main oil path 100 and the third port c of the main oil path 100 always depends on the opening pressure of the safety valve 310, that is, the pressure value supplemented to the leveling oil path 200 by the pressure supplementing oil path 300 always depends on the opening pressure of the safety valve 310.
Further, when the pressure reducing valve 320 stops operating, the relief valve 310 functions as a relief valve, preventing the pressure of the hydraulic oil flowing from the pressure-replenishing oil passage 300 to the leveling oil passage 200 from becoming excessive.
As such, the hydraulic oil introduced from the third port c of the main oil passage 100 into the first port d of the pressure-replenishing oil passage 300 can be introduced into the oil inlet of the pressure-reducing valve 320. The hydraulic oil in the oil inlet of the pressure reducing valve 320 is reduced to a preset pressure value of the pressure reducing valve 320 through the pressure reducing effect of the pressure reducing valve 320, then flows to the second oil port b of the main oil path 100 and the third oil port c of the main oil path 100 through the oil outlet of the pressure reducing valve 320, and finally flows to the rodless cavity of the second leveling oil cylinder 220 and the rodless cavity of the first leveling oil cylinder 210 through the second oil port b of the main oil path 100, and flows to the rod cavity of the second leveling oil cylinder 220 and the rod cavity of the first leveling oil cylinder 210 through the third oil port c of the main oil path 100, so that the preset pressure value is always maintained in the leveling oil path 200, thereby shortening the leveling time of the aerial work platform, and enabling the aerial work platform to be in a horizontal state all the time. Meanwhile, the hydraulic oil at the oil outlet of the pressure reducing valve 320 also flows to the oil inlet of the safety valve 310, so that the pressure value supplemented into the leveling oil path 200 by the pressure supplementing oil path 300 always depends on the opening pressure of the safety valve 310, and the phenomenon that the aerial work platform is tilted due to the fact that the pressure supplemented into the leveling oil path 200 by the pressure supplementing oil path 300 is too high is avoided.
Referring to fig. 3, it can be understood that the pressure supplementing oil path 300 further includes a constant flow valve 350, the constant flow valve 350 is disposed on the first pipeline 330, the first port g of the constant flow valve 350 is communicated with the first port d of the pressure supplementing oil path 300, and the first port h of the constant flow valve 350 is communicated with the oil inlet of the pressure reducing valve 320.
It should be noted that the flow rate of the hydraulic oil flowing out from the first port h of the constant flow valve 350 is kept constant regardless of the change in the flow rate of the hydraulic oil entering the pressure-replenishing oil path 300 from the first port d of the pressure-replenishing oil path 300.
Thus, the flow rate of the hydraulic oil flowing into the pressure compensating oil path 300 can be controlled by the constant flow valve 350, and the relief valve 310 is prevented from overflowing.
Referring to fig. 1 to 3, it can be understood that the pressure compensating oil path 300 further includes a first check valve 360, the first check valve 360 is disposed on the first pipeline 330, and the first check valve 360 is disposed between the first end of the second pipeline 340 and the second port e of the pressure compensating oil path 300; the pressure compensating oil path 300 further includes a second check valve 370, the second check valve 370 is disposed on the second pipeline 340, and the second check valve 370 is disposed between the first end of the second pipeline 340 and the third port f of the pressure compensating oil path 300.
Thus, the hydraulic oil flowing out of the oil outlet of the pressure reducing valve 320 can flow to the second oil port e of the pressure compensating oil path 300 through the first oil port of the first check valve 360 and the second oil port of the first check valve 360, so that the pressure compensating oil path 300 can supplement the hydraulic oil to the rodless cavity of the first leveling cylinder 210 and the rodless cavity of the second leveling cylinder 220, and meanwhile, the hydraulic oil flowing out of the oil outlet of the pressure reducing valve 320 can flow to the third oil port f of the pressure compensating oil path 300 through the first oil port of the second check valve 370 and the second oil port of the second check valve 370, so that the pressure compensating oil path 300 can supplement the hydraulic oil to the rod cavity of the first leveling cylinder 210 and the rod cavity of the second leveling cylinder 220. In this process, the first check valve 360 can enable the hydraulic oil flowing out of the oil outlet of the pressure reducing valve 320 to slowly flow to the second oil port e of the pressure supplementing oil path 300, so that the pressure supplementing oil path 300 can slowly supplement the hydraulic oil to the rodless cavity of the first leveling cylinder 210 and the rodless cavity of the second leveling cylinder 220, and the hydraulic oil entering the rodless cavity of the first leveling cylinder 210 and the rodless cavity of the second leveling cylinder 220 from the second oil port e of the pressure supplementing oil path 300 is prevented from generating pressure impact on the rodless cavity of the first leveling cylinder 210 and the rodless cavity of the second leveling cylinder 220; meanwhile, the second check valve 370 may enable the hydraulic oil flowing out of the oil outlet of the pressure reducing valve 320 to slowly flow to the third oil port f of the pressure supplementing oil path 300, so that the pressure supplementing oil path 300 may slowly supplement the hydraulic oil to the rod cavity of the first leveling cylinder 210 and the rod cavity of the second leveling cylinder 220, and the hydraulic oil entering the rod cavity of the first leveling cylinder 210 and the rod cavity of the second leveling cylinder 220 from the third oil port f of the pressure supplementing oil path 300 is prevented from generating pressure impact on the rod cavity of the first leveling cylinder 210 and the rod cavity of the second leveling cylinder 220.
The aerial work platform comprises the leveling hydraulic control system.
In the aerial work platform, the leveling hydraulic control system can shorten the time for the opening pressure of the first balance valve 230 or the second balance valve 240 in the leveling oil path 200 to reach, so that the problem of leveling delay of the aerial work platform is avoided, and the aerial work platform can be always in a horizontal state, so that the aerial work platform has high safety, and the personal safety of operators standing on the aerial work platform can be ensured.
The embodiments of the present invention have been described in detail with reference to the drawings, but the present invention is not limited to the embodiments, and various changes can be made within the knowledge of those skilled in the art without departing from the gist of the present invention.
Claims (10)
1. A leveling hydraulic control system, comprising:
a main oil passage;
the leveling oil circuit comprises a first leveling oil cylinder, a second leveling oil cylinder, a first balancing valve and a second balancing valve, wherein the first leveling oil cylinder and the second leveling oil cylinder are used for leveling an aerial work platform, a rodless cavity of the first leveling oil cylinder is communicated with a rodless cavity of the second leveling oil cylinder, a rod cavity of the first leveling oil cylinder is communicated with a rod cavity of the second leveling oil cylinder, the rodless cavity of the first leveling oil cylinder and the rodless cavity of the second leveling oil cylinder are both communicated with a first oil port of the main oil circuit, the rod cavity of the first leveling oil cylinder and the rod cavity of the second leveling oil cylinder are both communicated with a second oil port of the main oil circuit, an oil inlet of the first balancing valve is communicated with the rodless cavity of the second leveling oil cylinder, an oil outlet of the first balancing valve is communicated with the first oil port of the main oil circuit, an oil inlet of the second balancing valve is communicated with the rod cavity of the second leveling oil cylinder, and an oil outlet of the second balancing valve is communicated with the second oil port of the main oil circuit;
a first oil port of the pressure supplementing oil way is communicated with a third oil port of the main oil way, a rodless cavity of the first leveling oil cylinder and a rodless cavity of the second leveling oil cylinder are both communicated with a second oil port of the pressure supplementing oil way, and a rod cavity of the first leveling oil cylinder and a rod cavity of the second leveling oil cylinder are both communicated with the third oil port of the pressure supplementing oil way;
the pressure supplementing oil way is used for supplementing hydraulic oil into the leveling oil way so as to enable the pressure value in the leveling oil way to keep a preset pressure value.
2. The leveling hydraulic control system according to claim 1, wherein the pressure compensating oil passage includes a relief valve, a pressure reducing valve, a first pipeline, and a second pipeline, a first end of the first pipeline is communicated with a first oil port of the pressure compensating oil passage, a second end of the first pipeline is communicated with a second oil port of the pressure compensating oil passage, a first end of the second pipeline is communicated with the first pipeline, a second end of the second pipeline is communicated with a third oil port of the pressure compensating oil passage, the pressure reducing valve and the relief valve are both disposed between the second end of the second pipeline and the first oil port of the pressure compensating oil passage, and the pressure reducing valve is disposed on the first pipeline;
the first oil port of the pressure reducing valve is communicated with the first oil port of the pressure supplementing oil way, the second oil port of the pressure supplementing oil way and the third oil port of the pressure supplementing oil way are both communicated with the second oil port of the pressure reducing valve, the first oil port of the safety valve is communicated with the first pipeline, and the second oil port of the safety valve is communicated with an oil tank.
3. The leveling hydraulic control system of claim 2, wherein the relief valve is disposed between the pressure reducing valve and the first port of the pressure makeup oil path, and the first port of the pressure makeup oil path and the first port of the pressure reducing valve are both in communication with the first port of the relief valve.
4. The leveling hydraulic control system according to claim 3, wherein a first damping hole and a second damping hole are provided in the first pipeline, the first damping hole is provided between the safety valve and the first oil port of the pressure compensating oil path, and the second damping hole is provided between the safety valve and the pressure reducing valve.
5. The leveling hydraulic control system of claim 3, wherein the relief valve is a check valve.
6. The leveling hydraulic control system of claim 3, wherein the relief valve is an overflow valve.
7. The leveling hydraulic control system of claim 2, wherein the pressure reducing valve is disposed between the safety valve and the first port of the pressure-replenishing oil path, and the second port of the pressure reducing valve is in communication with the first port of the safety valve.
8. The leveling hydraulic control system of claim 7, wherein the pressure compensating oil circuit further comprises a constant flow valve, the constant flow valve is disposed on the first pipeline, and a first oil port of the constant flow valve is communicated with a first oil port of the pressure compensating oil circuit, and a second oil port of the constant flow valve is communicated with a first oil port of the pressure reducing valve.
9. The leveling hydraulic control system according to claim 2, wherein the pressure supplementing oil path further comprises a first check valve, the first check valve is disposed on the first pipeline, and the first check valve is disposed between the first end of the second pipeline and the second oil port of the pressure supplementing oil path;
the pressure supplementing oil way further comprises a second one-way valve, the second one-way valve is arranged on the second pipeline, and the second one-way valve is arranged between the first end of the second pipeline and a third oil port of the pressure supplementing oil way.
10. An aerial work platform comprising a levelling hydraulic control system as claimed in any one of claims 1 to 9.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210841200.4A CN115231485A (en) | 2022-07-18 | 2022-07-18 | Leveling hydraulic control system and aerial work platform |
| PCT/CN2022/132204 WO2024016529A1 (en) | 2022-07-18 | 2022-11-16 | Leveling hydraulic control system and aerial work platform |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210841200.4A CN115231485A (en) | 2022-07-18 | 2022-07-18 | Leveling hydraulic control system and aerial work platform |
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| CN115231485A true CN115231485A (en) | 2022-10-25 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202210841200.4A Pending CN115231485A (en) | 2022-07-18 | 2022-07-18 | Leveling hydraulic control system and aerial work platform |
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| Country | Link |
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| CN (1) | CN115231485A (en) |
| WO (1) | WO2024016529A1 (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115653957A (en) * | 2022-12-09 | 2023-01-31 | 临工重机股份有限公司 | Hydraulic leveling system and aerial work platform |
| WO2024016529A1 (en) * | 2022-07-18 | 2024-01-25 | 湖南星邦智能装备股份有限公司 | Leveling hydraulic control system and aerial work platform |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108278229A (en) * | 2018-03-19 | 2018-07-13 | 湖南星邦重工有限公司 | A kind of crank arm type high-altitude operation vehicle connector leveling hydraulic system |
| CN207762038U (en) * | 2017-12-26 | 2018-08-24 | 长沙天盾重工有限责任公司 | A kind of high-altitude operation vehicle leveling hydraulic loop |
| US20180319634A1 (en) * | 2014-10-30 | 2018-11-08 | Xuzhou Heavy Machinery Co., Ltd. | Crane hydraulic system and controlling method of the system |
| CN111547653A (en) * | 2020-05-19 | 2020-08-18 | 三一海洋重工有限公司 | Fork leveling system and method and telescopic arm forklift |
| CN113830709A (en) * | 2021-11-25 | 2021-12-24 | 徐州徐工随车起重机有限公司 | Double-rotation telescopic amplitude-variable lifting platform, leveling mechanism hydraulic system and control method |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FI955172A0 (en) * | 1995-10-30 | 1995-10-30 | Sakari Pinomaeki | Foerfarande i ett tryckmediumsystem och ett tryckmediumsystem |
| JP2002321895A (en) * | 2001-04-26 | 2002-11-08 | Aichi Corp | Leveling device of high lift work vehicle |
| CN108644164B (en) * | 2018-06-21 | 2024-03-01 | 徐州海伦哲专用车辆股份有限公司 | Static pressure leveling system of overhead working truck |
| CN111396390B (en) * | 2020-04-29 | 2021-05-18 | 徐州徐工随车起重机有限公司 | Balance valve group suitable for stability control of overhead working truck |
| CN115231485A (en) * | 2022-07-18 | 2022-10-25 | 湖南星邦智能装备股份有限公司 | Leveling hydraulic control system and aerial work platform |
-
2022
- 2022-07-18 CN CN202210841200.4A patent/CN115231485A/en active Pending
- 2022-11-16 WO PCT/CN2022/132204 patent/WO2024016529A1/en unknown
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20180319634A1 (en) * | 2014-10-30 | 2018-11-08 | Xuzhou Heavy Machinery Co., Ltd. | Crane hydraulic system and controlling method of the system |
| CN207762038U (en) * | 2017-12-26 | 2018-08-24 | 长沙天盾重工有限责任公司 | A kind of high-altitude operation vehicle leveling hydraulic loop |
| CN108278229A (en) * | 2018-03-19 | 2018-07-13 | 湖南星邦重工有限公司 | A kind of crank arm type high-altitude operation vehicle connector leveling hydraulic system |
| CN111547653A (en) * | 2020-05-19 | 2020-08-18 | 三一海洋重工有限公司 | Fork leveling system and method and telescopic arm forklift |
| CN113830709A (en) * | 2021-11-25 | 2021-12-24 | 徐州徐工随车起重机有限公司 | Double-rotation telescopic amplitude-variable lifting platform, leveling mechanism hydraulic system and control method |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2024016529A1 (en) * | 2022-07-18 | 2024-01-25 | 湖南星邦智能装备股份有限公司 | Leveling hydraulic control system and aerial work platform |
| CN115653957A (en) * | 2022-12-09 | 2023-01-31 | 临工重机股份有限公司 | Hydraulic leveling system and aerial work platform |
Also Published As
| Publication number | Publication date |
|---|---|
| WO2024016529A1 (en) | 2024-01-25 |
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