CN114370437B - Scissor fork type aerial work platform lifting hydraulic control system - Google Patents
Scissor fork type aerial work platform lifting hydraulic control system Download PDFInfo
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- CN114370437B CN114370437B CN202111668528.2A CN202111668528A CN114370437B CN 114370437 B CN114370437 B CN 114370437B CN 202111668528 A CN202111668528 A CN 202111668528A CN 114370437 B CN114370437 B CN 114370437B
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- 239000003921 oil Substances 0.000 claims description 214
- 239000010720 hydraulic oil Substances 0.000 claims description 8
- 230000003111 delayed effect Effects 0.000 claims 1
- 238000004880 explosion Methods 0.000 claims 1
- 238000000034 method Methods 0.000 description 7
- 230000003749 cleanliness Effects 0.000 description 4
- 239000012530 fluid Substances 0.000 description 3
- 230000006978 adaptation Effects 0.000 description 2
- 230000001174 ascending effect Effects 0.000 description 2
- 238000010276 construction Methods 0.000 description 2
- 238000013016 damping Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000001914 filtration Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000000903 blocking effect Effects 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 230000000750 progressive effect Effects 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
Classifications
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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
-
- 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
- F15B11/02—Systems essentially incorporating special features for controlling the speed or actuating force of an output member
- F15B11/028—Systems essentially incorporating special features for controlling the speed or actuating force of an output member for controlling the actuating force
-
- 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
- F15B11/02—Systems essentially incorporating special features for controlling the speed or actuating force of an output member
- F15B11/04—Systems essentially incorporating special features for controlling the speed or actuating force of an output member for controlling the speed
-
- 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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- 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
- F15B2211/00—Circuits for servomotor systems
- F15B2211/20—Fluid pressure source, e.g. accumulator or variable axial piston pump
- F15B2211/205—Systems with pumps
- F15B2211/20507—Type of prime mover
- F15B2211/20515—Electric motor
-
- 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
- F15B2211/00—Circuits for servomotor systems
- F15B2211/70—Output members, e.g. hydraulic motors or cylinders or control therefor
- F15B2211/78—Control of multiple output members
Landscapes
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Forklifts And Lifting Vehicles (AREA)
Abstract
The invention discloses a scissor type aerial work platform lifting hydraulic control system, which comprises: a lifting hydraulic cylinder; an oil inlet path; an oil return path; the reversing valve comprises an oil inlet P1 connected with the oil inlet, an oil return port T1 connected with the oil return path and a working oil port A1, the reversing valve is positioned at a first station, the working oil port A1 is communicated with the oil return port T1, the reversing valve is positioned at a second station, and the working oil port A1 is communicated with the oil inlet P1; the proportional reversing valve comprises an oil inlet P2 connected with the working oil port A1 and a working oil port A2 connected with the rodless cavity; the proportional reversing valve is positioned at a first station, and a first oil duct between the oil inlet P2 and the working oil port A2 is communicated; the proportional reversing valve is positioned at a second station, and a second oil duct with adjustable opening between the oil inlet P2 and the working oil port A2 is communicated; the reversing valve is positioned at a second station, and the proportional reversing valve is positioned at a first station; the reversing valve is positioned at a first station, and the proportional reversing valve is positioned at a second station. The descending speed of the aerial working platform is adjustable.
Description
Technical Field
The invention relates to the technical field of hydraulic control of scissor type aerial work platforms, in particular to a hydraulic control system for lifting of a scissor type aerial work platform.
Background
There is an increasing demand for scissor aerial work platforms in the construction industry, logistics industry, airports, railways, etc. However, the requirements for the lifting speed of the aerial platform are different due to different use requirements of different industries. The existing scissor type aerial work platform descends by means of dead weight, and the descending speed of the platform is controlled by utilizing damping, so that descending damping needs to be replaced frequently due to inconsistent use requirements of different clients, and a plurality of inconveniences are brought to the use of different clients.
Therefore, how to make the lowering speed of the scissor aerial platform meet the use requirements of different customers is a problem to be solved by those skilled in the art.
Disclosure of Invention
In view of the above, the present invention is to provide a hydraulic control system for lifting a scissor aerial platform, which can make the lowering speed of the scissor aerial platform meet the use requirements of different clients.
In order to achieve the above object, the present invention provides the following technical solutions:
a scissor aerial work platform lift hydraulic control system, comprising:
the lifting hydraulic cylinder is used for driving the lifting of the aerial working platform;
An oil inlet path for supplying hydraulic oil;
the oil return path is used for returning oil to the oil tank;
the reversing valve comprises an oil inlet P1, an oil return port T1 and a working oil port A1, wherein the oil inlet P1 is connected with the oil inlet, the oil return port T1 is connected with the oil return path, the working oil port A1 is communicated with the oil return port T1 when the reversing valve is in a first station, and the working oil port A1 is communicated with the oil inlet P1 when the reversing valve is in a second station;
The proportional reversing valve comprises an oil inlet P2 and a working oil port A2, the oil inlet P2 is connected with the working oil port A1, and the working oil port A2 is connected with a rodless cavity of the lifting hydraulic cylinder; when the proportional reversing valve is in a first station, a first oil duct between the oil inlet P2 and the working oil port A2 is communicated; when the proportional reversing valve is in a second station, a second oil duct between the oil inlet P2 and the working oil port A2 is communicated, and the opening of the second oil duct is adjustable; when the reversing valve is positioned at the second station, the proportional reversing valve is positioned at the first station; when the reversing valve is positioned at the first station, the proportional reversing valve is positioned at the second station.
Preferably, the oil pump further comprises a control handle, wherein the control handle is connected with a controller, and the controller controls the opening amount of the second oil duct according to the action amplitude of the control handle.
Preferably, a first filter is arranged between the working oil port A2 and the rodless cavity.
Preferably, the first filter is integrated with the proportional reversing valve.
Preferably, the first oil passage is provided with a one-way valve, so that the oil flow direction of the first oil passage is from the oil inlet P2 to the working oil port A2.
Preferably, the lifting hydraulic cylinder comprises a first lifting hydraulic cylinder and a second lifting hydraulic cylinder, a first explosion-proof valve is arranged between the working oil port A2 and the first lifting hydraulic cylinder, and a second explosion-proof valve is arranged between the working oil port A2 and the second lifting hydraulic cylinder.
Preferably, when the lifting hydraulic cylinder needs to descend, the switching action of the second explosion-proof valve lags behind the switching action of the proportional reversing valve by a preset time period.
Preferably, a throttle valve is built in the second explosion-proof valve to control the descending speed of the second lifting hydraulic cylinder.
Preferably, the method further comprises:
The inlet of the first overflow valve is arranged on a pipeline between the working oil port A1 and the oil inlet P2, and the outlet of the first overflow valve is connected with the oil return path;
and/or the inlet of the second overflow valve is arranged on the oil inlet path, and the outlet of the second overflow valve is connected with the oil return path.
Preferably, an oil inlet of the oil inlet channel is connected with a motor pump set for providing hydraulic power.
When the scissor type aerial work platform lifting hydraulic control system provided by the invention works, when the scissor type aerial work platform is required to be lifted, the reversing valve is positioned at the second station, the proportional reversing valve is positioned at the first station, at the moment, the working oil port A1 of the reversing valve 4 is communicated with the oil inlet P1, the first oil passage between the oil inlet P2 of the proportional reversing valve and the working oil port A2 is communicated, hydraulic oil supplied by the oil inlet path flows out from the working oil port A1 of the reversing valve after entering the oil inlet P1 of the reversing valve, flows into the oil inlet P2 of the proportional reversing valve, flows out from the working oil port A2 of the proportional reversing valve through the first oil passage of the proportional reversing valve, finally flows into the rodless cavity of the lifting hydraulic cylinder, and pushes the piston rod of the lifting hydraulic cylinder to extend out, so that the aerial work platform is lifted.
When the scissor type aerial work platform is required to descend, the reversing valve is located at a first station, the proportional reversing valve is located at a second station, at the moment, a working oil port A1 of the reversing valve is communicated with an oil return port T1, a second oil duct between an oil inlet P2 of the proportional reversing valve and the working oil port A2 is communicated, the aerial work platform compresses oil in a rodless cavity of the lifting hydraulic cylinder by means of dead weight, oil in the rodless cavity of the lifting hydraulic cylinder enters the proportional reversing valve, then flows out of the oil inlet P2 of the proportional reversing valve through the second oil duct of the proportional reversing valve, then flows into the reversing valve from the working oil port A1, finally flows into an oil return path from the oil return port T1 of the reversing valve, and finally returns the oil to an oil tank. Because the aperture of the second oil duct of the proportional reversing valve is adjustable, in the descending process of the aerial working platform, the descending speed of the aerial working platform can be adjusted by adjusting the aperture of the second oil duct of the proportional reversing valve, so that the descending speed of the aerial working platform can be adjusted to meet the use requirements of different clients.
In addition, the embodiment adopts the proportional reversing valve with a response speed not very high to adjust the descending speed of the aerial working platform, and has higher cost performance.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, it being obvious that the drawings in the following description are only embodiments of the present invention, and that other drawings may be obtained according to the provided drawings without inventive effort for a person skilled in the art.
Fig. 1 is a control schematic diagram of a scissor type aerial work platform lifting hydraulic control system according to an embodiment of the present invention.
The reference numerals in fig. 1 are as follows:
The hydraulic oil pump is characterized in that the hydraulic oil pump is composed of a lifting hydraulic cylinder 1, an oil inlet path 2, an oil return path 3, a reversing valve 4, a proportional reversing valve 5, a first filter 6, a one-way valve 7, a first explosion-proof valve 8, a second explosion-proof valve 9, a first overflow valve 10, a second overflow valve 11, a hydraulic pump 12, a motor 13, a second filter 14, a third filter 15, an air filter 16 and an oil tank 17.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
The invention provides a scissor type aerial work platform lifting hydraulic control system, which can enable the descending speed of the scissor type aerial work platform to meet the use requirements of different clients.
Referring to fig. 1, a control schematic diagram of a hydraulic control system for lifting a scissor aerial platform according to an embodiment of the present invention is shown.
The invention provides a scissor type aerial work platform lifting hydraulic control system, which comprises a lifting hydraulic cylinder 1, an oil inlet path 2, an oil return path 3, a reversing valve 4 and a proportional reversing valve 5, wherein the lifting hydraulic cylinder 1 is used for driving the aerial work platform to lift, and when a piston rod of the lifting hydraulic cylinder 1 extends out, the aerial work platform rises; when the piston rod of the lifting hydraulic cylinder 1 is retracted, the aerial working platform descends. The oil inlet path 2 is used for supplying hydraulic oil; the oil return path 3 is used for returning oil to the oil tank 17. The reversing valve 4 comprises an oil inlet P1, an oil return port T1 and a working oil port A1, the oil inlet P1 is connected with the oil inlet path 2, the oil return port T1 is connected with the oil return path 3, the working oil port A1 is communicated with the oil return port T1 when the reversing valve 4 is in a first station, and the working oil port A1 is communicated with the oil inlet P1 when the reversing valve 4 is in a second station. The proportional reversing valve 5 comprises an oil inlet P2 and a working oil port A2, the oil inlet P2 is connected with the working oil port A1, and the working oil port A2 is connected with a rodless cavity of the lifting hydraulic cylinder 1; when the proportional reversing valve 5 is positioned at the first station, a first oil passage between the oil inlet P2 and the working oil port A2 is communicated; when the proportional reversing valve 5 is positioned at the second station, a second oil duct between the oil inlet P2 and the working oil port A2 is communicated, and the opening of the second oil duct is adjustable; when the reversing valve 4 is at the second station, the proportional reversing valve 5 is at the first station; when the reversing valve 4 is in the first station, the proportional reversing valve 5 is in the second station.
When the scissor type aerial work platform is required to be lifted, the reversing valve 4 is positioned at the second station, the proportional reversing valve 5 is positioned at the first station, at the moment, the working oil port A1 of the reversing valve 4 is communicated with the oil inlet P1, the first oil passage between the oil inlet P2 of the proportional reversing valve 5 and the working oil port A2 is communicated, hydraulic oil supplied by the oil inlet path 2 enters the oil inlet P1 of the reversing valve 4, flows out from the working oil port A1 of the reversing valve 4 and flows into the oil inlet P2 of the proportional reversing valve 5, flows out from the working oil port A2 of the proportional reversing valve 5 through the first oil passage of the proportional reversing valve 5, finally flows into the rodless cavity of the lifting hydraulic cylinder 1, and pushes the piston rod of the lifting hydraulic cylinder 1 to extend, so that the aerial work platform is lifted.
When the scissor type aerial work platform is required to descend, the reversing valve 4 is located at a first station, the proportional reversing valve 5 is located at a second station, at the moment, the working oil port A1 of the reversing valve 4 is communicated with the oil return port T1, a second oil passage between the oil inlet P2 of the proportional reversing valve 5 and the working oil port A2 is communicated, the aerial work platform compresses oil in a rodless cavity of the lifting hydraulic cylinder 1 by means of dead weight, after the oil in the rodless cavity of the lifting hydraulic cylinder 1 enters the proportional reversing valve 5, the oil flows out of the oil inlet P2 of the proportional reversing valve 5 through the second oil passage of the proportional reversing valve 5, then flows into the reversing valve 4 from the working oil port A1, finally flows into the oil return passage 3 from the oil return port T1 of the reversing valve 4, and finally the oil flows back to the oil tank 17. Because the aperture of the second oil duct of the proportional reversing valve 5 is adjustable, in the descending process of the aerial working platform, the descending speed of the aerial working platform can be adjusted by adjusting the aperture of the second oil duct of the proportional reversing valve 5, so that the descending speed of the aerial working platform can be adjusted to meet the use requirements of different clients.
In addition, the embodiment adopts the proportional reversing valve 5 with a response speed not very high to adjust the descending speed of the aerial working platform, and the cost performance is relatively high.
In order to facilitate the adjustment of the opening of the second oil passage of the proportional reversing valve 5, on the basis of the above embodiment, the present invention further includes a control handle, and the control handle is connected with a controller, and the controller controls the opening amount of the second oil passage according to the movement amplitude of the control handle. That is, in this embodiment, by adding the control handle so as to be convenient for an operator to operate, when the operator operates the control handle, the controller controls the opening amount of the second oil duct of the proportional reversing valve 5 according to the magnitude of the motion amplitude of the control handle, thereby achieving the purpose of adjusting the lowering speed of the aerial work platform, being convenient to operate, and being capable of adjusting the lowering speed of the aerial work platform at any time and any place.
In order to avoid the problem that the proportional reversing valve 5 is blocked due to low cleanliness of oil in the rodless cavity, a first filter 6 is arranged between the working oil port A2 and the rodless cavity on the basis of the embodiment. Like this, when high altitude construction platform descends, the fluid in lifting hydraulic cylinder 1 rodless chamber gets into proportional reversing valve 5 after the filtration of first filter 6, can promote the cleanliness of the fluid that gets into proportional reversing valve 5, avoids proportional reversing valve 5 to block because of impurity etc. in the fluid, consequently reducible proportional reversing valve 5's fault rate.
In view of the convenience of the assembly of the scissor type aerial work platform lifting hydraulic control system, the first filter 6 is integrated with the proportional directional valve 5 on the basis of the above-described embodiment. In other words, the first filter 6 is built in the proportional directional valve 5, so that the proportional directional valve 5 is the proportional directional valve 5 with filtering function, oil can be automatically cleaned, and the proportional directional valve 5 can be directly installed at a required position during assembly, thereby bringing convenience to the overall assembly of the scissor type aerial work platform lifting hydraulic control system.
In addition, when the aerial working platform ascends, in order to avoid oil backflow, the stability of the aerial working platform ascending is improved, and on the basis of the embodiment, the first oil duct is provided with the one-way valve 7, so that the oil flow direction of the first oil duct is from the oil inlet P2 to the working oil port A2. That is, the arrangement of the check valve 7 makes the oil in the first oil passage flow from the oil inlet P2 to the working oil port A2, but not from the working oil port A2 to the oil inlet P2, so that the stability of the aerial working platform in the lifting process can be improved, the fluctuation in the lifting process is avoided, and the pressure maintaining effect is also provided after the aerial working platform is lifted in place, so that the safety is improved.
Further, in order to enable the aerial platform to have enough power when ascending, and meanwhile, in order to promote safety, on the basis of the embodiment, the lifting hydraulic cylinder 1 comprises a first lifting hydraulic cylinder and a second lifting hydraulic cylinder, a first explosion-proof valve 8 is arranged between the working oil port A2 and the first lifting hydraulic cylinder, and a second explosion-proof valve 9 is arranged between the working oil port A2 and the second lifting hydraulic cylinder. That is, the present embodiment drives the aerial work platform to rise and fall simultaneously using the first lifting hydraulic cylinder and the second lifting hydraulic cylinder. It is understood that the working oil ports A2 of the proportional reversing valve 5 are connected with rodless cavities of the first lifting hydraulic cylinder and the second lifting hydraulic cylinder, respectively.
In addition, considering that when the high-altitude operation platform descends at a low speed, the displacement of the control handle is small, the dead zone exists in the proportional reversing valve 5, when the dead zone of the proportional reversing valve 5 is not yet passed, and the oil in the rodless cavity of the lifting hydraulic cylinder 1 flows into the proportional reversing valve 5 from the second explosion-proof valve 9, the condition of unstable flow can occur, so that the high-altitude operation platform shakes in the descending process. That is, when the aerial working platform needs to descend, the proportional reversing valve 5 is firstly enabled to act, the second oil duct of the proportional reversing valve 5 is enabled to have a stable opening amount, and then the second explosion-proof valve 9 is enabled to act, so that the aerial working platform starts to descend, the phenomenon of unstable flow is avoided, the speed stability of the aerial working platform is better when the proportion is reduced, and the lifting experience and the comfort of the aerial working platform are improved.
In addition, in order to avoid the lowering of the aerial platform too fast to cause the lowering of the stall, on the basis of the above embodiment, the second explosion-proof valve 9 is built with a throttle valve to control the lowering speed of the second lifting hydraulic cylinder. In this embodiment, the throttle valve is built in the second explosion-proof valve 9, so that the lowering stall of the aerial working platform caused by the blocking of the second explosion-proof valve 9 is prevented.
Further, on the basis of the above embodiment, the hydraulic oil recovery device further comprises a first overflow valve 10 and/or a second overflow valve 11, wherein an inlet of the first overflow valve 10 is arranged on a pipeline between the working oil port A1 and the oil inlet P2, and an outlet of the first overflow valve 10 is connected with the oil return channel 3; an inlet of the second overflow valve 11 is arranged on the oil inlet path 2, and an outlet of the second overflow valve 11 is connected with the oil return path 3. It can be appreciated that the first relief valve 10 is capable of adjusting the maximum pressure at which the lifting hydraulic cylinder 1 lifts; the second relief valve 11 can adjust the maximum pressure output from the oil inlet passage 2 to ensure the safety of the hydraulic control system.
In addition, it should be noted that, as long as the oil inlet path 2 is connected to any hydraulic source with stable pressure, as a preferable scheme, on the basis of the above embodiment, the oil inlet of the oil inlet path 2 is connected to a motor pump set for providing hydraulic power. That is, the present embodiment supplies hydraulic power to the oil intake path 2 through the motor pump unit.
The motor-pump unit comprises a hydraulic pump 12 and an electric motor 13 connected to the hydraulic pump 12. Preferably, a second filter 14 is connected to the inlet of the hydraulic pump 12 to ensure cleanliness of the oil entering the hydraulic pump 12.
Preferably, an air filter 16 is also provided in a tank 17 for providing a source of oil to the hydraulic pump 12.
In addition, the oil return 3 is preferably provided with a third filter 15 to ensure cleanliness of the oil returned to the oil tank 17.
It should also be noted that in this specification, relational terms such as first and second, and the like are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions.
In this specification, each embodiment is described in a progressive manner, and each embodiment is mainly described by a difference from other embodiments, and identical and similar parts between the embodiments are referred to each other.
The hydraulic control system for lifting the scissor type aerial work platform provided by the invention is described in detail above. The principles and embodiments of the present invention have been described herein with reference to specific examples, the description of which is intended only to facilitate an understanding of the method of the present invention and its core ideas. It should be noted that it will be apparent to those skilled in the art that various modifications and adaptations of the invention can be made without departing from the principles of the invention and these modifications and adaptations are intended to be within the scope of the invention as defined in the following claims.
Claims (8)
1. A scissor type aerial work platform lifting hydraulic control system is characterized by comprising:
A lifting hydraulic cylinder (1) for driving the lifting of the aerial working platform;
An oil inlet path (2) for supplying hydraulic oil; an oil inlet of the oil inlet channel (2) is connected with a motor pump set for providing hydraulic power, the motor pump set comprises a hydraulic pump (12) and a motor (13) connected with the hydraulic pump (12), and an inlet of the hydraulic pump (12) is connected with a second filter (14);
An oil return path (3) for returning oil to the oil tank (17);
The reversing valve (4) comprises an oil inlet P1, an oil return port T1 and a working oil port A1, wherein the oil inlet P1 is connected with the oil inlet path (2), the oil return port T1 is connected with the oil return path (3), the working oil port A1 is communicated with the oil return port T1 when the reversing valve (4) is positioned at a first station, and the working oil port A1 is communicated with the oil inlet P1 when the reversing valve (4) is positioned at a second station;
The proportional reversing valve (5), the proportional reversing valve (5) comprises an oil inlet P2 and a working oil port A2, the oil inlet P2 is connected with the working oil port A1, and the working oil port A2 is connected with a rodless cavity of the lifting hydraulic cylinder (1); when the proportional reversing valve (5) is positioned at a first station, a first oil passage between the oil inlet P2 and the working oil port A2 is communicated; when the proportional reversing valve (5) is positioned at a second station, a second oil duct between the oil inlet P2 and the working oil port A2 is communicated, and the opening of the second oil duct is adjustable; when the reversing valve (4) is positioned at the second station, the proportional reversing valve (5) is positioned at the first station; when the reversing valve (4) is positioned at a first station, the proportional reversing valve (5) is positioned at a second station;
the lifting hydraulic cylinder (1) comprises a first lifting hydraulic cylinder and a second lifting hydraulic cylinder, a first explosion-proof valve (8) is arranged between the working oil port A2 and the first lifting hydraulic cylinder, and a second explosion-proof valve (9) is arranged between the working oil port A2 and the second lifting hydraulic cylinder;
when the lifting hydraulic cylinder (1) needs to descend, the switching action of the second explosion-proof valve (9) is delayed by a preset time period from the switching action of the proportional reversing valve (5).
2. The scissor lift hydraulic control system of claim 1, further comprising a control handle, wherein the control handle is connected with a controller, and wherein the controller controls the opening amount of the second oil duct according to the movement amplitude of the control handle.
3. The scissor type aerial work platform lifting hydraulic control system according to claim 1, wherein a first filter (6) is arranged between the working oil port A2 and the rodless cavity.
4. A scissor lift hydraulic control system according to claim 3, characterized in that the first filter (6) is integrated with the proportional reversing valve (5).
5. The scissor type aerial work platform lifting hydraulic control system according to claim 1, wherein the first oil duct is provided with a one-way valve (7) so that the oil flow direction of the first oil duct is from the oil inlet P2 to the working oil port A2.
6. A scissor lift hydraulic control system according to any of the claims 1-5, characterized in that said second explosion proof valve (9) is built-in with a throttle valve to control the lowering speed of said second lift hydraulic cylinder.
7. The scissor lift hydraulic control system of any of claims 1-5, further comprising:
The inlet of the first overflow valve (10) is arranged on a pipeline between the working oil port A1 and the oil inlet P2, and the outlet of the first overflow valve (10) is connected with the oil return channel (3);
And/or a second overflow valve (11), wherein an inlet of the second overflow valve (11) is arranged on the oil inlet path (2), and an outlet of the second overflow valve (11) is connected with the oil return path (3).
8. The scissor type aerial work platform lifting hydraulic control system according to any one of claims 1-5, wherein an oil inlet of the oil inlet way (2) is connected with a motor pump set for providing hydraulic power.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111668528.2A CN114370437B (en) | 2021-12-31 | 2021-12-31 | Scissor fork type aerial work platform lifting hydraulic control system |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111668528.2A CN114370437B (en) | 2021-12-31 | 2021-12-31 | Scissor fork type aerial work platform lifting hydraulic control system |
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| Publication Number | Publication Date |
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| CN114370437A CN114370437A (en) | 2022-04-19 |
| CN114370437B true CN114370437B (en) | 2024-09-20 |
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| CN202111668528.2A Active CN114370437B (en) | 2021-12-31 | 2021-12-31 | Scissor fork type aerial work platform lifting hydraulic control system |
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| CN114715819B (en) * | 2022-05-10 | 2023-06-23 | 上海圣克赛斯液压股份有限公司 | High-altitude parachuting simulation hydraulic lifting system |
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| CN104528555B (en) * | 2014-12-19 | 2017-03-22 | 中联重科股份有限公司 | Main arm variable amplitude control system of crane and crane |
| CN207762035U (en) * | 2017-12-26 | 2018-08-24 | 长沙天盾重工有限责任公司 | A kind of scissor-type altitude job platform hydraulic system |
| CN215171263U (en) * | 2021-06-04 | 2021-12-14 | 三一帕尔菲格特种车辆装备有限公司 | Scissor-fork type aerial work platform and lifting hydraulic system thereof |
| CN113700706B (en) * | 2021-07-09 | 2024-10-22 | 武汉船用机械有限责任公司 | Hydraulic control system for lifting device |
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