CN106976825A - Bypass the scissor aerial work platform hydraulic control system of off-load electromagnetic direct-drive - Google Patents
Bypass the scissor aerial work platform hydraulic control system of off-load electromagnetic direct-drive Download PDFInfo
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- CN106976825A CN106976825A CN201710212583.8A CN201710212583A CN106976825A CN 106976825 A CN106976825 A CN 106976825A CN 201710212583 A CN201710212583 A CN 201710212583A CN 106976825 A CN106976825 A CN 106976825A
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- valve
- drive
- electromagnetic direct
- walking
- control module
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Classifications
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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
- B66F11/042—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 actuated by lazy-tongs mechanisms or articulated levers
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60K—ARRANGEMENT OR MOUNTING OF PROPULSION UNITS OR OF TRANSMISSIONS IN VEHICLES; ARRANGEMENT OR MOUNTING OF PLURAL DIVERSE PRIME-MOVERS IN VEHICLES; AUXILIARY DRIVES FOR VEHICLES; INSTRUMENTATION OR DASHBOARDS FOR VEHICLES; ARRANGEMENTS IN CONNECTION WITH COOLING, AIR INTAKE, GAS EXHAUST OR FUEL SUPPLY OF PROPULSION UNITS IN VEHICLES
- B60K17/00—Arrangement or mounting of transmissions in vehicles
- B60K17/04—Arrangement or mounting of transmissions in vehicles characterised by arrangement, location, or kind of gearing
- B60K17/10—Arrangement or mounting of transmissions in vehicles characterised by arrangement, location, or kind of gearing of fluid gearing
-
- 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
- B66F7/00—Lifting frames, e.g. for lifting vehicles; Platform lifts
- B66F7/06—Lifting frames, e.g. for lifting vehicles; Platform lifts with platforms supported by levers for vertical movement
- B66F7/08—Lifting frames, e.g. for lifting vehicles; Platform lifts with platforms supported by levers for vertical movement hydraulically or pneumatically operated
-
- 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)
- Combustion & Propulsion (AREA)
- Chemical & Material Sciences (AREA)
- Transportation (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- General Engineering & Computer Science (AREA)
- Forklifts And Lifting Vehicles (AREA)
- Fluid-Pressure Circuits (AREA)
Abstract
The present invention relates to hydraulic test, more particularly to a kind of scissor aerial work platform hydraulic control system for bypassing off-load electromagnetic direct-drive, include elevating control module, course changing control module, travelling control module, course changing control module includes electromagnetic direct-drive switching valve, electromagnetic direct-drive switching valve is made up of steering main valve plug, left steering electromagnet and right turn electromagnet, main valve plug is turned to provided with bypass unloading channel, neutral position off-load；Travelling control module includes electromagnetic direct-drive walking valve, and walking main valve plug is provided with bypass unloading channel, neutral position off-load.The present invention realizes thread cartridge magnetic valve function using switch electromagnet and the combination of many flow-through main valves so that magnetic valve internal structure relative simplicity, reduces requirement on machining accuracy, reduction installation and after cost.By switch electromagnet and many flow-through main valve Combination Designs, the excessively stream pressure loss can be suitably reduced, the capacity usage ratio of hydraulic system is improved to greatest extent, main frame endurance is lifted.
Description
Technical field
The present invention relates to technical field of hydraulic pressure, more particularly to a kind of scissor aerial work platform hydraulic control system.
Background technology
Aerial work platform is a kind of Multifunctional hoisting loading mechanization equipment, in addition to being conveyed as the goods of different height,
It is widely used in the operations such as the installation, maintenance in high-altitude, such as municipal administration maintenance, harbour, logistics center's cargo transport, building decoration etc.,
Stage+module automobile chassis, storage battery chassis etc., can freely walk.Aerial work platform Related product mainly has：Scissor-type
Aerial work platform, trailer-type aerial work platform, crank type aerial working platform, straight arm type aerial work platform, aluminium alloy
Aerial work platform, double-cylinder type aerial work platform, the major class of spider-type aerial work platform seven.Other scissor-type work high above the ground is put down
Platform is cheap compared to arm-type car；It is more flexible compared to the aerial work platform mobility such as hand propelled, spider-type, column type, therefore cut
V shape aerial work platform is increasingly approved that the work high above the ground that market portion has held a safe lead major types is put down by client
Platform.
But present scissor aerial work platform hydraulic control system has following problems：1st, scissor-type high-altitude
Job platform hydraulic control system is integrated in control valve block from four thread cartridge magnetic valves, control aerial work platform
Lifting, steering, advance（Retreat）And high low speed walking, wherein using 3-position 4-way（Or five is logical）Thread cartridge magnetic valve is distinguished
Control is turned to and advanced（Retreat）, because three multiport thread cartridge electromagnetic valve structures are relative complex, requirement on machining accuracy is high, examines
Consider security reliability main frame unit and use import brand, virtually add installation and after cost, be unfavorable for main frame
Home-produced Reconstruction.2nd, in order to ensure to turn to preferential and regime flow（3.5L/min）It is required that, the 3-position 4-way electricity turned in control
Pressure compensated flow regulating valve has been installed before magnet valve（Start the general setting value of pressure in 6-8bar）, cause not turn to linear rows
Additionally system pressure 6-8bar is improved when walking operating mode；Although thread cartridge electromagnetic valve structure is compact to be easy to integrated, pressure damage
Mistake value is often bigger than normal and non-constant, is especially being especially apparent more than three in flow-through；Moreover aerial work platform is typically using storage
Battery is as power resources, and cruising time is short and development bottleneck of charging interval length system aerial work platform, therefore to greatest extent
The capacity usage ratio of raising hydraulic system also have certain realistic meaning.3rd, running gear is not provided with the back of the body on motor oil return line
Pressure valve, i.e., do not form certain oil return resistance, have considerable influence to mechanism kinematic stationarity.
The content of the invention
In view of the above-mentioned problems, the goal of the invention of the present invention is to provide, a kind of cost is low, restriction loss is small and operates steadily
Bypass off-load electromagnetic direct-drive scissor aerial work platform hydraulic control system.
For up to above-mentioned purpose, the technical proposal of the invention is realized in this way：A kind of bypass off-load electromagnetic direct-drive of construction
Scissor aerial work platform hydraulic control system, includes elevating control module, course changing control module, travelling control module,
Elevating control module preferentially gives elevating mechanism fuel feeding by two position four-way solenoid valves, and course changing control module is steady prior to walking mechanism
Flow fuel feeding simultaneously connects brake to steering mechanism, travelling control module drive running motor, and its difference is：Turn to control
Molding block includes electromagnetic direct-drive switching valve, electromagnetic direct-drive switching valve by steering main valve plug, be arranged on steering main valve plug control end
Left steering electromagnet and right turn electromagnet composition, turn to main valve plug provided with bypass unloading channel, neutral position off-load；Walking
Control module include electromagnetic direct-drive walking valve, electromagnetic direct-drive walk valve by walking main valve plug, be arranged on walking main valve plug control
End it is forward walk electromagnet and rear walking electromagnet composition, walking main valve plug is provided with bypass unloading channel, neutral position off-load.
It is preferred that the main valve plug of the electromagnetic direct-drive switching valve is three six logical sliding valve structures.
It is preferred that the main valve plug of the electromagnetic direct-drive walking valve is three six logical sliding valve structures.
It is preferred that the bypass unloading channel for turning to main valve plug is in parallel with pressure compensated flow regulating valve oil inlet.
It is preferred that being provided with pressure-differentially-set valve between brake oil inlet passage and electromagnetic direct-drive walking valve oil inlet；Electromagnetism is straight
Drive walking valve work oil return line and be provided with counterbalance valve.
Compared with prior art, beneficial effect has the present invention：
（1）Electromagnetic direct-drive switching valve and electromagnetic direct-drive walking valve are substituted into flow-through thread cartridge magnetic valve more than three, i.e., using opening
Thread cartridge magnetic valve function is realized in powered-down magnet and the combination of many flow-through main valves so that magnetic valve internal structure relative simplicity, drop
Low requirement on machining accuracy, reduction installation and after cost, are easy to main frame Home-produced Reconstruction；
（2）Pressure compensated flow regulating valve oil inlet parallel connection bypass oil duct, connects the middle position unloading channel of electromagnetic direct-drive switching valve,
, from the bypass straight mistake of oil duct, eliminate flow stabilizing valve from without turning to oil stream during straight line moving operating mode and start pressure, system pressure is more former
System reduces 6-8bar；By switch electromagnet and many flow-through main valve Combination Designs, thread cartridge magnetic valve function is realized, can be with
The appropriate reduction excessively stream pressure loss, improves the capacity usage ratio of hydraulic system, lifts main frame endurance to greatest extent.
（3）Pressure-differentially-set valve, electromagnetic direct-drive row are provided between brake oil inlet passage and electromagnetic direct-drive walking valve oil inlet
Walk valve work oil return line and be provided with counterbalance valve.Running motor is in descending, and load even occurs in the reduction of outer load pressure, cause be
Pressure of uniting is reduced, because the pressure superposition value of pressure-differentially-set valve and counterbalance valve is set in the half-clutch interval of brake so that brake
In half-clutch state, now brake is equivalent to brake function so that complete machine descending steadily slows down, and dilatory will not pause；Electricity
Magnetic directly drives walking valve work oil return line and is provided with counterbalance valve, forms certain oil return resistance so that mechanism kinematic is steady, so as to ensure
Reliable, the trouble free service of whole hydraulic system, make hydraulic oil maintain optimum working temperature.
Brief description of the drawings
Fig. 1 aerial work platform hydraulic system principle figures in the prior art；
The hydraulic system principle figure that Fig. 2 embodiment of the present invention is implemented；
Fig. 3 control system schematic diagrams of the embodiment of the present invention；
Description of symbols in figure：
1-oil pump, 2-filter, 3-fuel tank, 4-hydraulic control system, 5-running motor, 6-manual-operated emergent unblock dress
Put, 7-brake, 8-steering cylinder, 9-control valve, 10-control valve, 11-elevating ram, 12-pressure gauge；
4.01-Y1 magnetic valves, 4.02-safety valve, 4.03-steering safety valve, 4.04-check valve, 4.05-level pressure are poor
Valve, 4.06-counterbalance valve, 4.07-Fill valve, 4.08-Y7 magnetic valves, 4.09-Y5 electromagnet, 4.10-walking main valve,
4.11-Y6 electromagnet, 4.12-Y3 electromagnet, 4.13-steering main valve, 4.14-Y4 electromagnet, 4.15-pressure compensation stream
Adjustable valve, 4.16-lifting safety valve, and P1 hydraulic fluid ports, T1 hydraulic fluid ports, T2 hydraulic fluid ports, C1 hydraulic fluid ports, C2 hydraulic fluid ports, B1 hydraulic fluid ports, B2 hydraulic fluid ports,
BR hydraulic fluid ports, BS hydraulic fluid ports, AS hydraulic fluid ports, CSE hydraulic fluid ports etc. are constituted.
Embodiment
For a better understanding of the present invention, the technology of the present invention is further illustrated with reference to the accompanying drawings and detailed description
Scheme, referring to Fig. 2 and Fig. 3.
The aerial work platform liquid walked certainly based on bypass off-load electromagnetic direct-drive control implemented by technical solution of the present invention
The inlet port of oil pump 1 is connected with hydraulic oil container 3 in pressure control system；The oil-out of oil pump 1 is put down with the work high above the ground of middle position unloading type
Platform hydraulic control system 4（Hereinafter referred to as hydraulic control system 4）P1 mouths be connected；The CSE mouths of hydraulic control system 4 and control
The P2 mouths of valve 9 and the P3 mouths of control valve 10 are connected；The left and right chamber phase of the AS mouths of hydraulic control system 4 and BS mouthfuls and steering cylinder
Even；The P4 mouths of the BR mouth manual-operated emergents tripper 6 of hydraulic control system 4 are connected；C1, C2, B1, B2 of hydraulic control system 4
Mouth is connected respectively at the oil inlet and outlet of running motor；The T2 mouths of hydraulic control system 4 are connected with filter 2, eventually pass back to fuel tank
3。
Hydraulic control system 4 implements structure as shown in figure 3, P1 hydraulic fluid ports are connected in Y1 magnetic valves 4.01, safety valve 4.02；Institute
Right oil-out when stating left position of the Y1 magnetic valves 4.01 in figure is connected with the lifting oil inlet of safety valve 4.16 and CSE hydraulic fluid ports, Y1
Left oil-out during left position of the magnetic valve 4.02 in figure leads to the oil inlet passage of course changing control module；Course changing control module is entered
Oily passage connection turns to the oil-feed of the intermediate oil inlet in figure during middle position mouthful of main valve 4.13 and pressure compensated flow regulating valve 4.15
Mouth is connected；The E1 oil-outs of pressure compensated flow regulating valve 4.15 exist with turning to the oil inlet of safety valve 4.03 and turning to main valve 4.13
Left oil inleting port in figure during middle position is connected；E2 oil-outs, the steering safety valve 4.03 of pressure compensated flow regulating valve 4.15 are fuel-displaced
The oil inlet passage of mouth and the oil-out UNICOM walking module of check valve 4.04；The oil inlet passage of walking module enters with pressure-differentially-set valve 4.05
The intermediate oil inlet mouthful and BR hydraulic fluid ports of hydraulic fluid port, walking main valve 4.10 in figure during middle position are connected；The oil-out of pressure-differentially-set valve 4.05 and row
Left oil inleting port of the main valve 4.10 in middle position is walked to connect；Walk left oil-out of the main valve 4.10 in figure during left position and C1 mouthfuls and Y7
Right oil inlet of the magnetic valve 4.08 in figure during left position is connected；Right oil-out and B2 mouthful of the walking main valve 4.10 in figure during left position
And the oil-out of Y7 magnetic valves 4.08 is connected；Upper middle oil-out of the main valve 4.10 in middle position of walking connects with the oil-out of counterbalance valve 4.06
It is logical；The lower oil-out of main valve 4.10 of walking is connected with the oil inlet of counterbalance valve 21；The oil inlet of check valve 4.07 walking main valve 4.10
Drainback passage connect, oil-out and C2 hydraulic fluid ports are connected；Turn to the two ends of main valve 4.13 and be respectively equipped with Y3 electromagnet 4.12 and Y4 electricity
Magnet 4.14, walking main valve 4.10 two ends are respectively equipped with Y5 electromagnet 4.09 and Y6 electromagnet 4.11.
The present invention operation principle be：
When the 1st, lifting.When complete machine is lifted, the commutation work of Y1 magnetic valves 4.01, the right position in figure, oil pump output fluid warp
Y1 magnetic valves 4.01 reach control valve 9 and control valve 10, to the rodless cavity fuel feeding of elevating ram, complete lifting action.In lifting
When, oil-free enters steering module and walking module, and steering mechanism and walking mechanism can not work, while brake 7 is in locked
State, it is ensured that complete machine is static in original place in lifting process.
When the 2nd, walking.When complete machine is walked, Y1 magnetic valves 4.01 do not work, the left position in figure, oil pump output fluid warp
Y1 magnetic valves 4.01, steering module oil inlet passage reach the import of pressure compensated flow regulating valve 4.15 and turn to main valve 4.13 and be in
Intermediate oil inlet mouthful during middle position, when steering main valve 4.13 does not work, the need of work of pressure compensated flow regulating valve 4.15 is higher
By turning to the middle position off-load oil duct of main valve 4.13, pressure-differentially-set valve is directly directly reached through check valve 4.04 for Opening pressure, fluid
4.05 oil inlets, walking main valve 4.10 intermediate oil inlet during middle position mouthful and BR hydraulic fluid ports in figure, when Y6 electromagnet 4.11 is powered, OK
Walk the work of main valve 4.10 and be in left position in figure, the walking middle position oil inlet passage of main valve 4.10 is shut, and fluid enters running motor work,
Complete machine is walked forward；Similarly Y5 electromagnet 4.09 is powered, and the walking work of main valve 4.10 is in right position in figure, and complete machine is walked backward.
The right position in figure is in when the work of Y7 magnetic valves 4.08, now two running motors are in parallel connection, complete machine low speed is big to be turned round
Square is walked；When Y7 magnetic valves 4.08 do not work the left position in figure, now two running motors are in series connection, and complete machine can
Realize and walk at a high speed.Meanwhile, the pressure of counterbalance valve 4.06 and pressure-differentially-set valve 4.05 is set in the half-clutch interval of brake so that system
Dynamic device 7 is in half-clutch state, and now brake 7 is equivalent to brake function so that complete machine descending steadily slows down, and dilatory will not stop
.
When the 3rd, turning to and walk.When complete machine is turned to and is walked, Y1 magnetic valves 4.01 are not operate at the left position in figure, oil pump
Fluid is exported to reach the import of pressure compensated flow regulating valve 4.15 through Y1 magnetic valves 4.01, steering module oil inlet passage and turn to master
The oil inlet of valve 4.13.When Y4 electromagnet 4.14 is powered, turns to main valve 4.13 and be operated in left position in figure, middle position unloading channel is sealed
Extremely, pump output fluid enters steering cylinder left chamber through AS mouthfuls, realizes right turn；Similarly Y3 electromagnet 4.12 is powered, and turns to main valve
4.13 are operated in right position in figure, realize left steering.Meanwhile, the unnecessary fluid that oil pump 1 is exported is through pressure compensated flow regulating valve
4.15 E2 oil-outs, are rotated, complete machine is walked forward to walking horse 5 up to fluid is provided.
Claims (5)
1. a kind of scissor aerial work platform hydraulic control system for bypassing off-load electromagnetic direct-drive, includes elevating control mould
Block, course changing control module, travelling control module, elevating control module are supplied by the way that two position four-way solenoid valves are preferential to elevating mechanism
Oil, course changing control module is prior to walking mechanism current stabilization amount fuel feeding to steering mechanism, and travelling control module drive running motor is simultaneously
Connect brake, it is characterised in that：Course changing control module includes electromagnetic direct-drive switching valve, and electromagnetic direct-drive switching valve is led by turning to
Valve element, the left steering electromagnet for being arranged on steering main valve plug control end and right turn electromagnet composition, turn to main valve plug provided with side
Road unloading channel, neutral position off-load；Travelling control module includes electromagnetic direct-drive walking valve, and electromagnetic direct-drive walks valve by walking
Main valve plug, be arranged on walking main valve plug control end it is forward walk electromagnet and rear walking electromagnet composition, walking main valve plug is provided with
Bypass unloading channel, neutral position off-load.
2. the scissor aerial work platform hydraulic control system of bypass off-load electromagnetic direct-drive according to claim 1, its
It is characterised by：The main valve plug of the electromagnetic direct-drive switching valve is three six logical sliding valve structures.
3. the scissor aerial work platform hydraulic control system of bypass off-load electromagnetic direct-drive according to claim 1, its
It is characterised by：The main valve plug of the electromagnetic direct-drive walking valve is three six logical sliding valve structures.
4. the scissor aerial work platform hydraulic control system of bypass off-load electromagnetic direct-drive according to claim 1, its
It is characterised by：The bypass unloading channel for turning to main valve plug is in parallel with pressure compensated flow regulating valve oil inlet.
5. the scissor aerial work platform hydraulic control system of bypass off-load electromagnetic direct-drive according to claim 1, its
It is characterised by：Pressure-differentially-set valve is provided between brake oil inlet passage and electromagnetic direct-drive walking valve oil inlet；Electromagnetic direct-drive is walked
Valve work oil return line is provided with counterbalance valve.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710212583.8A CN106976825B (en) | 2017-04-01 | 2017-04-01 | Bypass the scissor aerial work platform hydraulic control system of off-load electromagnetic direct-drive |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710212583.8A CN106976825B (en) | 2017-04-01 | 2017-04-01 | Bypass the scissor aerial work platform hydraulic control system of off-load electromagnetic direct-drive |
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| Publication Number | Publication Date |
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| CN106976825A true CN106976825A (en) | 2017-07-25 |
| CN106976825B CN106976825B (en) | 2018-12-14 |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107477041A (en) * | 2017-08-28 | 2017-12-15 | 美通重工有限公司 | Fork lifting platform elevating ram valve block |
| CN108661970A (en) * | 2018-07-25 | 2018-10-16 | 浙江高宇液压机电有限公司 | Scissor aerial work platform walking brake fluid pressure control valve group and system |
| CN110040439A (en) * | 2019-04-28 | 2019-07-23 | 淮北矿业股份有限公司 | A kind of follow-on fully-mechanized digging machine scratch board conveyor hydraulic system |
| CN112026917A (en) * | 2020-09-01 | 2020-12-04 | 山东华龙农业装备股份有限公司 | Self-propelled mechanism of electric scissor maintenance operation device and self-propelled mode control method thereof |
| CN112357850A (en) * | 2020-09-01 | 2021-02-12 | 山东华龙农业装备股份有限公司 | Lifting mechanism of electric scissor maintenance operation device |
| CN114198353A (en) * | 2021-12-31 | 2022-03-18 | 杭叉集团股份有限公司 | Scissor fork type aerial work platform hydraulic control system |
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| CN203946859U (en) * | 2014-05-28 | 2014-11-19 | 湖南星邦重工有限公司 | A kind of lifting of scissor-type altitude job platform and down maneuver hydraulic efficiency pressure system |
| CN106314137A (en) * | 2015-06-16 | 2017-01-11 | 徐工集团工程机械股份有限公司 | Walking brake control hydraulic system and shear-fork aerial work platform |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107477041A (en) * | 2017-08-28 | 2017-12-15 | 美通重工有限公司 | Fork lifting platform elevating ram valve block |
| CN108661970A (en) * | 2018-07-25 | 2018-10-16 | 浙江高宇液压机电有限公司 | Scissor aerial work platform walking brake fluid pressure control valve group and system |
| CN110040439A (en) * | 2019-04-28 | 2019-07-23 | 淮北矿业股份有限公司 | A kind of follow-on fully-mechanized digging machine scratch board conveyor hydraulic system |
| CN112026917A (en) * | 2020-09-01 | 2020-12-04 | 山东华龙农业装备股份有限公司 | Self-propelled mechanism of electric scissor maintenance operation device and self-propelled mode control method thereof |
| CN112357850A (en) * | 2020-09-01 | 2021-02-12 | 山东华龙农业装备股份有限公司 | Lifting mechanism of electric scissor maintenance operation device |
| CN112026917B (en) * | 2020-09-01 | 2022-03-11 | 山东华龙农业装备股份有限公司 | Self-propelled mechanism of electric scissor maintenance operation device and self-propelled mode control method thereof |
| CN112357850B (en) * | 2020-09-01 | 2022-08-23 | 山东华龙农业装备股份有限公司 | Lifting mechanism of electric scissor maintenance operation device |
| CN114198353A (en) * | 2021-12-31 | 2022-03-18 | 杭叉集团股份有限公司 | Scissor fork type aerial work platform hydraulic control system |
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| Publication number | Publication date |
|---|---|
| CN106976825B (en) | 2018-12-14 |
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Address after: 317000 358, zhe Road, Dayang street, Taizhou, Zhejiang. Applicant after: Zhejiang Gaoyu Hydraulic Mechanical and Electrical Co., Ltd. Address before: 317000 No. 358, extension Road, Dayang street, Taizhou, Zhejiang. Applicant before: Zhejiang Gaoyu Hydraulic Mechanical and Electrical Co., Ltd. |
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