CN110285106B - Multi-way valve, swing oil cylinder low-speed motion control system thereof and overhead working truck - Google Patents
Multi-way valve, swing oil cylinder low-speed motion control system thereof and overhead working truck Download PDFInfo
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- CN110285106B CN110285106B CN201910660061.3A CN201910660061A CN110285106B CN 110285106 B CN110285106 B CN 110285106B CN 201910660061 A CN201910660061 A CN 201910660061A CN 110285106 B CN110285106 B CN 110285106B
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- 230000033001 locomotion Effects 0.000 title claims abstract description 18
- 230000001105 regulatory effect Effects 0.000 claims abstract description 26
- 230000002457 bidirectional effect Effects 0.000 abstract description 6
- 230000006872 improvement Effects 0.000 description 7
- 238000000034 method Methods 0.000 description 5
- 239000012530 fluid Substances 0.000 description 4
- 230000009471 action Effects 0.000 description 2
- 230000000903 blocking effect Effects 0.000 description 2
- 238000007254 oxidation reaction Methods 0.000 description 2
- 230000004044 response Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000000052 comparative effect Effects 0.000 description 1
- 230000001276 controlling effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
Classifications
-
- 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
-
- 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
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Structural Engineering (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- General Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- Geology (AREA)
- Fluid-Pressure Circuits (AREA)
Abstract
The invention discloses a multi-way valve, which comprises an electronic proportional speed regulating valve, a main overflow valve, a first electromagnetic switch reversing valve and a second electromagnetic switch reversing valve; the electronic proportional speed regulating valve is arranged between an oil inlet of the electromagnetic switch reversing valve and an oil inlet of the multi-way valve, and bypasses an oil return port of the multi-way valve; the first electromagnetic switch reversing valve and the second electromagnetic switch reversing valve are connected in parallel, a common oil inlet of the first electromagnetic switch reversing valve is communicated with an outlet of the electronic proportional speed regulating valve, and a common oil return port of the first electromagnetic switch reversing valve is communicated with an oil return port of the multi-way valve; the main overflow valve is arranged between the oil inlet of the multi-way valve and the oil return port of the multi-way valve. According to the invention, the swing speed and direction of the working bucket are controlled through the combination of the single-connection bidirectional overflow valve of the multi-way valve swing cylinder and the unidirectional return throttle valve arranged on the working oil way, so that the small flow stable control of the swing cylinder is realized, the control of the swing speed and the low-speed movement of the swing cylinder of the working bucket is realized, and the bidirectional overflow valve only limits the single-connection working pressure of the multi-way valve swing cylinder and does not influence the working pressure of other working joints.
Description
Technical Field
The invention relates to a multi-way valve, a swing oil cylinder low-speed motion control system thereof and an overhead working truck, and belongs to the technical field of hydraulic pressure.
Background
As a typical working bucket lifting operation device, an overhead working truck needs a working bucket swinging oil cylinder to swing stably at a low speed. How to realize the low-speed stable control of the swinging oil cylinder of the working bucket, the speed is adjustable, and simultaneously, the faster response is realized with low cost, which is a problem to be solved by the technicians in the field.
At present, a typical working bucket swinging oil cylinder swings stably at a low speed and mainly passes through working oil of the working bucket swinging oil cylinderBy setting orifices in the road, usually of diameterTo->An orifice or a one-way orifice; another mode is to set a bypass proportional throttle valve on the valve group oil inlet path to adjust the working linkage oil inlet flow rate as disclosed by a multifunctional working bucket electrohydraulic leveling valve group (ZL 201721312443. X), thereby realizing low-speed control.
In the first mode, two orifices are required to be respectively arranged on the working oil inlet path and the working oil return path, so that the oil filling speed of the oil working linkage oil inlet path of the swing oil cylinder is low due to the throttling of the oil inlet of the working oil path, and the response time of the execution movement of the swing oil cylinder is long; the second approach requires high accuracy for the comparative throttle valve, resulting in high cost of the throttle element and associated electrical control.
Disclosure of Invention
Aiming at the problems in the prior art, the invention provides a multi-way valve, a swing oil cylinder low-speed motion control system and an overhead working truck thereof, and the functions of low-speed stable control and speed adjustable of the swing oil cylinder are realized.
In order to achieve the purpose, the multi-way valve comprises an electronic proportional speed regulating valve, a main overflow valve, a first electromagnetic switch reversing valve and a second electromagnetic switch reversing valve;
the electronic proportional speed regulating valve is arranged between an oil inlet of the electromagnetic switch reversing valve and an oil inlet of the multi-way valve, and bypasses an oil return port of the multi-way valve;
the first electromagnetic switch reversing valve and the second electromagnetic switch reversing valve are connected in parallel, a common oil inlet of the first electromagnetic switch reversing valve is communicated with an outlet of the electronic proportional speed regulating valve, and a common oil return port of the first electromagnetic switch reversing valve is communicated with an oil return port of the multi-way valve;
the main overflow valve is arranged between the oil inlet of the multi-way valve and the oil return port of the multi-way valve.
As an improvement, the electronic proportional speed regulating valve adopts a two-position three-way electronic proportional speed regulating valve.
As an improvement, the first electromagnetic switch reversing valve is a three-position four-way electromagnetic switch reversing valve.
In addition, the invention also provides a swing cylinder low-speed motion control system, which comprises the multi-way valve, the two-way overflow valve, the first one-way oil return throttle valve, the second one-way oil return throttle valve, the balance valve and the swing cylinder;
the balance valve is arranged between the first one-way oil return throttle valve, the second one-way oil return throttle valve and the swing oil cylinder;
the left-hand oil port of the swing oil cylinder is connected with a first one-way oil return throttle valve through a balance valve, and the right-hand oil port of the swing oil cylinder is connected with a second one-way oil return throttle valve through a balance valve;
an oil inlet of the first one-way oil return throttle valve and an oil inlet of the second one-way oil return throttle valve are connected with a first electromagnetic switch reversing valve of the multi-way valve;
the two-way overflow valve is arranged between two working oil ways which are respectively connected with the multi-way valve by the first one-way oil return throttle valve and the second one-way oil return throttle valve.
As an improvement, an oil inlet of the first electromagnetic switch reversing valve is connected with an outlet of the electronic proportional speed regulating valve, a first working oil port of the first electromagnetic switch reversing valve is connected with an oil inlet of the first one-way oil return throttle valve, a second working oil port of the first electromagnetic switch reversing valve is connected with an oil inlet of the second one-way oil return throttle valve, and an oil return port of the first electromagnetic switch reversing valve is connected with an oil return port of the multi-way valve.
As an improvement, the first one-way oil return throttle valve and the second one-way oil return throttle valve are throttle valves for oil inlet all-pass oil return throttle.
As an improvement, the two-way overflow valve comprises a first overflow valve and a second overflow valve;
and an oil inlet of the first overflow valve is bypassed at a first working oil port of the first electromagnetic switch reversing valve, and an oil inlet of the second overflow valve is bypassed at a second working oil port of the first electromagnetic switch reversing valve.
As an improvement, the balancing valve is a two-way balancing valve.
Finally, the invention also provides an overhead working truck, which is provided with the swing oil cylinder low-speed motion control system.
Compared with the prior art, the invention has the beneficial effects that:
1) According to the invention, the swing speed and direction of the working bucket are controlled through the combination of the single-connection bidirectional overflow valve of the multi-way valve swing cylinder and the unidirectional return throttle valve arranged on the working oil way, so that the small flow stable control of the swing cylinder is realized, the control of the swing speed and the low-speed movement of the swing cylinder of the working bucket is realized, and the bidirectional overflow valve only limits the single-connection working pressure of the multi-way valve swing cylinder and does not influence the working pressure of other working joints.
2) According to the invention, through the matching of the pressure set value of the bidirectional overflow valve and the load adjustment of the swing oil cylinder, smaller flow control of the orifice with larger diameter is realized. The larger diameter of the throttle hole can improve the pollution resistance of the throttle hole and solve the blocking problem of the throttle hole caused by high-temperature oxidation generated by high-speed friction of liquid flow. Compared with the method adopting a high-performance proportional throttle valve for throttling and speed regulation, the method reduces the cost of the hydraulic system.
Drawings
Fig. 1 is a schematic diagram of the hydraulic principle of the swing cylinder low-speed swing control system of the invention.
In the figure: 1. the device comprises a multi-way valve, 11, an electronic proportional speed regulating valve, 12, a main overflow valve, 13, a first electromagnetic switch reversing valve, 14, a second electromagnetic switch reversing valve, 2, a two-way overflow valve, 21, a first overflow valve, 22, a second overflow valve, 3, a first one-way oil return throttle valve, 4, a second one-way oil return throttle valve, 5, a balance valve, 6 and a swinging oil cylinder;
p, the multiway valve oil inlet, T, multiway valve oil return opening, A1, first electromagnetic switch switching-over valve first work hydraulic fluid port, B1, first electromagnetic switch switching-over valve second work hydraulic fluid port, A2, second electromagnetic switch switching-over valve first work hydraulic fluid port, B2, second electromagnetic switch switching-over valve second work hydraulic fluid port.
Detailed Description
The present invention will be described in further detail below in order to make the objects, technical solutions and advantages of the present invention more apparent. It should be understood that the detailed description and specific examples, while indicating the invention, are intended for purposes of illustration only and are not intended to limit the scope of the invention.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs, and the terms used herein in this description of the invention are for the purpose of describing particular embodiments only and are not intended to be limiting of the invention.
As shown in fig. 1, a multi-way valve comprises an electronic proportional speed regulating valve 11, a main overflow valve 12, a first electromagnetic switch reversing valve 13 and a second electromagnetic switch reversing valve 14;
the electronic proportional speed regulating valve 11 is a two-position three-way electronic proportional speed regulating valve, and the electronic proportional speed regulating valve 11 is arranged between a parallel oil inlet of the first electromagnetic switch reversing valve and the parallel oil inlet P of the multi-way valve and bypasses an oil return port T of the multi-way valve; the first electromagnetic switch reversing valve 13 and the second electromagnetic switch reversing valve 14 are connected in parallel, a common oil inlet of the first electromagnetic switch reversing valve is communicated with an outlet of the electronic proportional speed regulating valve 11, and a common oil return port of the first electromagnetic switch reversing valve is communicated with an oil return port T of the multi-way valve; the electronic proportional speed regulating valve 11 is arranged between the oil inlet P of the multi-way valve and the common oil inlets of the first electromagnetic switch reversing valve 13 and the second electromagnetic switch reversing valve 14, and mainly completes the flow control of the common oil inlets of the first electromagnetic switch reversing valve 13 and the second electromagnetic switch reversing valve 14;
the main overflow valve 12 is arranged between the multi-way valve oil inlet P and the multi-way valve oil return port T and is used for overload protection and limiting the highest working pressure of the multi-way valve.
In addition, the invention also provides a swing cylinder low-speed motion control system which comprises the multi-way valve 1, the two-way overflow valve 2, the first one-way oil return throttle valve 3, the second one-way oil return throttle valve 4, the balance valve 5 and the swing cylinder 6;
the balance valve 5 is a bidirectional balance valve and is arranged among the first unidirectional oil return throttle valve 3, the second unidirectional oil return throttle valve 4 and the swing cylinder 6;
the left-hand oil port of the swing oil cylinder 6 is connected with the oil return port of the first one-way oil return throttle valve 3 through the balance valve 5, and the right-hand oil port of the swing oil cylinder 6 is connected with the oil return port of the second one-way oil return throttle valve 4 through the balance valve 5;
an oil inlet of the first one-way oil return throttle valve 3 is connected with a first working oil port A1 of a first electromagnetic switch reversing valve of the multi-way valve 1, and an oil inlet of the second one-way oil return throttle valve 4 is connected with a second working oil port B1 of the first electromagnetic switch reversing valve of the multi-way valve 1;
the two-way overflow valve 2 is arranged between two working oil ways which are respectively connected with the multi-way valve 1 by the first one-way oil return throttle valve 3 and the second one-way oil return throttle valve 4.
As an improvement of the embodiment, the first electromagnetic switch reversing valve 13 is a three-position four-way electromagnetic switch reversing valve, which is used for controlling the movement direction of the swinging oil cylinder 6, and an oil inlet of the first electromagnetic switch reversing valve is connected with an outlet of the electronic proportional speed regulating valve 11;
the first working oil port A1 of the first electromagnetic switch reversing valve is connected with the oil inlet of the first one-way oil return throttle valve 3, the second working B1 of the first electromagnetic switch reversing valve is connected with the oil inlet of the second one-way oil return throttle valve 4, and the oil return port of the first electromagnetic switch reversing valve 13 is connected with the oil return port T of the multi-way valve.
The first one-way oil return throttle valve 3 and the second one-way oil return throttle valve 4 are throttle valves for oil inlet full-through oil return throttle, and the throttle valves have the functions of enabling oil return of the swing oil cylinder 6 to form throttle ports and back pressure and improving the small-flow inching stability of the swing oil cylinder. The oil outlet of the first one-way oil return throttle valve 3 is connected with the balance valve 5, and the oil outlet of the second one-way oil return throttle valve 4 is connected with the balance valve 5.
The two-way relief valve 2 includes a first relief valve 21 and a second relief valve 22. The oil inlet of the first overflow valve 21 is bypassed at the first working oil port A1 of the first electromagnetic switch reversing valve to limit the working pressure of the first working oil port A1 of the first electromagnetic switch reversing valve, and the second overflow valve 22 is bypassed at the second working oil port B1 of the first electromagnetic switch reversing valve to limit the working pressure of the second working oil port B1 of the first electromagnetic switch reversing valve.
According to the invention, through the proportional pressure limiting arrangement of the oil return throttling port formed by the first one-way oil return throttling valve 3 and the second one-way oil return throttling valve 4 and the two-way overflow valve arranged in the bypass of the working oil way of the swinging oil cylinder, the stable and adjustable rotation speed of the swinging oil cylinder of the working bucket can be realized.
The lower pressure limiting arrangement of the two-way overflow valve can enable orifices matched with the two-way overflow valve to select larger diameters of the first one-way oil return throttle valve 3 and the second one-way oil return throttle valve 4And meanwhile, the swing oil cylinder has small stable rotation speed. The method improves the capability of the throttle orifice for resisting pollution, oxidization, blocking and flow stopping and improves the reliability of the system. Compared with the method for throttling and speed regulating by using a high-performance proportional throttle valve, the method reduces the cost of the hydraulic system and has the following working principle:
when the electronic proportional speed regulating valve 11 receives the signal of the amplifier to be started and the first electromagnetic switch reversing valve 13 receives the signal of the controller to be in the lower position, part of pressure oil flows from the oil inlet P of the multi-way valve, passes through the electronic proportional speed regulating valve 11, the first working oil port A1 of the first electromagnetic switch reversing valve and the first one-way return throttle valve 3, and then flows into the swing oil cylinder 6 through the balance valve 5 to push the swing oil cylinder to rotate left. The oil return pushed out by the swing oil cylinder 6 flows through the balance valve 5, the second one-way oil return throttle valve 4, the second working oil port B1 of the first electromagnetic switch reversing valve and the electromagnetic switch reversing valve 13 to the oil return port T of the multi-way valve, and the swing oil cylinder completes the left-hand action. The other part of pressure oil flows through the first overflow valve 21 to the second working oil port B1 of the first electromagnetic switch reversing valve, and is merged with the oil return of the swing cylinder to return to the oil return port T of the multi-way valve;
the flow rate through the second one-way return throttle valve 4 is determined by the set pressure of the first relief valve 21 minus the work load of the swing cylinder 6 and the residual pressure after the pressure loss of the balance valve 5 together with the throttle diameter of the second one-way return throttle valve 4.
When the electronic proportional speed regulating valve 11 is opened by receiving the signal of the amplifier and the first electromagnetic switch reversing valve 13 is in an upper position by receiving the signal of the controller, part of pressure oil flows from the oil inlet P of the multi-way valve group through the electronic proportional speed regulating valve 11, the second working oil port B1 of the first electromagnetic switch reversing valve and the second one-way return throttle valve 4, and then flows into the swing oil cylinder 6 through the balance valve 5 to push the swing oil cylinder to rotate right. The oil return pushed out by the swing oil cylinder 6 flows through the balance valve 5, the first one-way oil return throttle valve 3, the first working oil port A1 of the first electromagnetic switch reversing valve and the oil return port T from the first electromagnetic switch reversing valve 13 to the multi-way valve, and the swing oil cylinder completes the right-handed action. The other part of pressure oil flows through the second overflow valve 22 to the first working oil port A1 of the first electromagnetic switch reversing valve and is converged with the oil return of the swing cylinder to return to the oil return port T of the multi-way valve;
the flow rate of the first one-way return throttle valve 3 is determined by the set pressure of the second overflow valve 22 minus the residual pressure of the swing cylinder 6 after the working load and the balance valve 5 are lost, and the throttle diameter of the first one-way return throttle valve 3.
The lower adjustable overflow setting pressure and the larger return throttling diameter are matched to realize stable rotation of the swing oil cylinder, and the speed can be set in proportion.
The operating pressure of the second electromagnetic switching-over valve 14 is limited by the main relief valve 12 and is not affected by the double relief valve 2.
Finally, the invention also provides an overhead working truck, which is provided with the swing oil cylinder low-speed motion control system.
According to the invention, the rotation speed of the swinging oil cylinder of the working bucket can be stably and adjustably realized through the proportional pressure limiting arrangement of the oil return throttle formed by the first one-way oil return throttle and the second one-way oil return throttle and the two-way overflow valve arranged by the working oil way bypass of the swinging oil cylinder.
The foregoing description of the preferred embodiments of the invention is not intended to be limiting, but rather is intended to cover all modifications, equivalents, or alternatives falling within the spirit and principles of the invention.
Claims (9)
1. The multi-way valve is characterized by comprising an electronic proportional speed regulating valve (11), a main overflow valve (12), a first electromagnetic switch reversing valve (13) and a second electromagnetic switch reversing valve (14);
the electronic proportional speed regulating valve (11) is arranged between an oil inlet of the electromagnetic switch reversing valve and an oil inlet (P) of the multi-way valve, and bypasses an oil return port (T) of the multi-way valve;
the first electromagnetic switch reversing valve (13) and the second electromagnetic switch reversing valve (14) are connected in parallel, a common oil inlet of the first electromagnetic switch reversing valve is communicated with an outlet of the electronic proportional speed regulating valve (11), and a common oil return port of the first electromagnetic switch reversing valve is communicated with an oil return port (T) of the multi-way valve;
the main overflow valve (12) is arranged between the oil inlet (P) of the multi-way valve and the oil return port (T) of the multi-way valve.
2. A multiway valve according to claim 1, characterized in that the electronic proportional speed valve (11) is a two-position three-way electronic proportional speed valve.
3. A multi-way valve according to claim 1, characterized in that the first electromagnetic switch reversing valve (13) is a three-position four-way electromagnetic switch reversing valve.
4. A swing cylinder low-speed motion control system, which is characterized by comprising a multi-way valve (1), a two-way overflow valve (2), a first one-way oil return throttle valve (3), a second one-way oil return throttle valve (4), a balance valve (5) and a swing cylinder (6) according to any one of claims 1-3;
the balance valve (5) is arranged between the first one-way oil return throttle valve (3), the second one-way oil return throttle valve (4) and the swing cylinder (6);
the left-hand oil port of the swing oil cylinder (6) is connected with the first one-way oil return throttle valve (3) through the balance valve (5), and the right-hand oil port of the swing oil cylinder (6) is connected with the second one-way oil return throttle valve (4) through the balance valve (5);
an oil inlet of the first one-way oil return throttle valve (3) and an oil inlet of the second one-way oil return throttle valve (4) are connected with a first electromagnetic switch reversing valve (13) of the multi-way valve (1);
the two-way overflow valve (2) is arranged between two working oil ways which are respectively connected with the multi-way valve (1) by the first one-way oil return throttle valve (3) and the second one-way oil return throttle valve (4).
5. The swing cylinder low-speed motion control system according to claim 4, wherein an oil inlet of a first electromagnetic switch reversing valve (13) is connected with an outlet of an electronic proportional speed regulating valve (11), a first working oil port (A1) of the first electromagnetic switch reversing valve is connected with an oil inlet of a first one-way return throttle valve (3), a second working oil port (B1) of the first electromagnetic switch reversing valve is connected with an oil inlet of a second one-way return throttle valve (4), and an oil return port of the first electromagnetic switch reversing valve (13) is connected with an oil return port (T) of a multi-way valve.
6. The swing cylinder low-speed motion control system according to claim 4, wherein the first one-way oil return throttle valve (3) and the second one-way oil return throttle valve (4) are throttle valves for oil inlet all-pass oil return throttle.
7. The swing cylinder low-speed motion control system according to claim 4, wherein the two-way relief valve (2) comprises a first relief valve (21) and a second relief valve (22);
an oil inlet of the first overflow valve (21) is bypassed at a first working oil port (A1) of the first electromagnetic switch reversing valve, and an oil inlet of the second overflow valve (22) is bypassed at a second working oil port (B1) of the first electromagnetic switch reversing valve.
8. The swing cylinder low speed motion control system according to claim 4, wherein the balance valve (5) is a two-way balance valve.
9. An overhead working truck, characterized in that the overhead working truck is equipped with the swing cylinder low-speed motion control system according to any one of claims 4 to 8.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910660061.3A CN110285106B (en) | 2019-07-22 | 2019-07-22 | Multi-way valve, swing oil cylinder low-speed motion control system thereof and overhead working truck |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201910660061.3A CN110285106B (en) | 2019-07-22 | 2019-07-22 | Multi-way valve, swing oil cylinder low-speed motion control system thereof and overhead working truck |
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| CN110285106A CN110285106A (en) | 2019-09-27 |
| CN110285106B true CN110285106B (en) | 2024-02-13 |
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| CN201910660061.3A Active CN110285106B (en) | 2019-07-22 | 2019-07-22 | Multi-way valve, swing oil cylinder low-speed motion control system thereof and overhead working truck |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104379846A (en) * | 2012-05-29 | 2015-02-25 | 现代重工业株式会社 | Independent flow control hydraulic system for excavator in pressure control mode |
| CN204251287U (en) * | 2014-11-17 | 2015-04-08 | 宁波海宏液压有限公司 | Electri forklift control cock group |
| CN106122157A (en) * | 2016-08-31 | 2016-11-16 | 徐州徐工随车起重机有限公司 | A kind of hydraulic control system of the high-altitude operation vehicle of ratio throttle grverning |
| CN107605843A (en) * | 2017-10-12 | 2018-01-19 | 徐州徐工随车起重机有限公司 | A kind of electro-hydraulic leveling valve group of multifunctional working bucket |
| CN210423204U (en) * | 2019-07-22 | 2020-04-28 | 徐州徐工随车起重机有限公司 | Multi-way valve, swing oil cylinder low-speed motion control system thereof and aerial work vehicle |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201574992U (en) * | 2009-11-10 | 2010-09-08 | 三一重工股份有限公司 | Multi-way valve, hydraulic device and concrete pump vehicle |
-
2019
- 2019-07-22 CN CN201910660061.3A patent/CN110285106B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104379846A (en) * | 2012-05-29 | 2015-02-25 | 现代重工业株式会社 | Independent flow control hydraulic system for excavator in pressure control mode |
| CN204251287U (en) * | 2014-11-17 | 2015-04-08 | 宁波海宏液压有限公司 | Electri forklift control cock group |
| CN106122157A (en) * | 2016-08-31 | 2016-11-16 | 徐州徐工随车起重机有限公司 | A kind of hydraulic control system of the high-altitude operation vehicle of ratio throttle grverning |
| CN107605843A (en) * | 2017-10-12 | 2018-01-19 | 徐州徐工随车起重机有限公司 | A kind of electro-hydraulic leveling valve group of multifunctional working bucket |
| CN210423204U (en) * | 2019-07-22 | 2020-04-28 | 徐州徐工随车起重机有限公司 | Multi-way valve, swing oil cylinder low-speed motion control system thereof and aerial work vehicle |
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| CN110285106A (en) | 2019-09-27 |
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