CN112797042A - Integrated main control valve, hydraulic system and crane - Google Patents
Integrated main control valve, hydraulic system and crane Download PDFInfo
- Publication number
- CN112797042A CN112797042A CN202110140827.2A CN202110140827A CN112797042A CN 112797042 A CN112797042 A CN 112797042A CN 202110140827 A CN202110140827 A CN 202110140827A CN 112797042 A CN112797042 A CN 112797042A
- Authority
- CN
- China
- Prior art keywords
- oil
- valve
- pilot
- communicated
- control
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Images
Classifications
-
- 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
- F15B1/00—Installations or systems with accumulators; Supply reservoir or sump assemblies
- F15B1/02—Installations or systems with accumulators
-
- 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
Landscapes
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Fluid-Pressure Circuits (AREA)
Abstract
The invention relates to a crane hydraulic control system, which aims to solve the problems of multiple connecting pipelines and complex structure of the existing crane hydraulic system; the integrated main control valve comprises an oil inlet joint, a winch joint, a telescopic amplitude joint and an oil return joint, pilot hydraulic control ends of main valves of the winch joint and the telescopic amplitude joint are connected with valve core control electromagnetic valves, oil inlet ends of the valve core control electromagnetic valves are connected with the pilot hydraulic control ends of the main valves, and oil outlet ends of the valve core control electromagnetic valves are communicated with a pressure relief oil way. In the invention, the valve core control electromagnetic valve is provided with only two oil ports, which is convenient for integration and arrangement on the integrated main control valve, so that hydraulic parts in an upper hydraulic control system of the crane can be integrated in the main control valve, thereby reducing connecting pipelines of the hydraulic system, reducing the cost of the whole machine and reducing oil leakage risk points of the pipeline of the whole machine.
Description
Technical Field
The invention relates to a hydraulic control system of a crane, in particular to an integrated main control valve, a hydraulic system and a crane.
Background
The hydraulic system for getting on the crane comprises a main pump, a pilot handle, a pilot oil supply valve, a main control valve, a telescopic oil cylinder switching valve, a two-section arm oil cylinder, a three-four-five-section arm oil cylinder and the like, wherein the pilot pump provides pilot flow and pressure for the main control valve; the pilot oil supply valve controls the switch of the pilot pressure, and the load safety of the system is ensured by cutting off the pilot pressure; the crane main control valve comprises a quadruple control oil path for controlling a main coil, an auxiliary coil, a variable amplitude and a telescopic oil cylinder of the automobile crane. The switching valve of the telescopic oil cylinder enables the main control valve to control the telescopic of the two-section arm oil cylinder or the three-four-five-section arm oil cylinder through switching.
The existing main control valve and a hydraulic system controlled by the main control valve have a plurality of hydraulic elements and a plurality of connecting pipelines of the whole machine, so that the cost of the whole machine is high and the quality feedback is high.
Disclosure of Invention
The invention aims to solve the technical problems that an existing crane hydraulic system is provided with a plurality of connecting pipelines and is complex in structure, and provides an integrated main control valve, a hydraulic system and a crane.
The technical scheme for realizing the purpose of the invention is as follows: the integrated main control valve is used for controlling a hydraulic system of a crane getting on a vehicle and comprises an oil inlet link, a winch link, a telescopic amplitude link and an oil return link, wherein the oil inlet link is provided with a P port, an oil return T port and a pressure relief L port communicated with a pressure relief oil path; oil return oil paths of the winch link, the telescopic amplitude variation link and the oil return link are communicated with each other and then are connected with an oil return T port through a back pressure valve; the oil inlet main oil path of the winch link, the telescopic amplitude-varying link and the oil return link is communicated with the port P; the winch connection and the telescopic amplitude variation connection are provided with pilot control oil ports communicated with pilot control ends of the main valve cores;
the winch is characterized in that pilot hydraulic control ends of main valves of the winch connection and the telescopic amplitude-varying connection are connected with valve core control electromagnetic valves, oil inlet ends of the valve core control electromagnetic valves are connected with the pilot hydraulic control ends of the main valves, and oil outlet ends of the valve core control electromagnetic valves are communicated with pressure relief oil paths. In the invention, when the valve core control electromagnetic valve is closed, the valve rod of the main valve core is controlled by the pilot pressure of the pilot control oil port, when the action controlled by the main valve core needs to be stopped urgently, the valve core control electromagnetic valve corresponding to the main valve core is conducted, the pilot control end of the main valve core is directly communicated with the pressure relief oil way, and the valve rod of the main valve core is reset to the middle position. Because the valve core control electromagnetic valve is only provided with two oil ports, the valve core control electromagnetic valve is convenient to integrate and arrange on the integrated main control valve, so that hydraulic parts in an upper hydraulic control system of the crane can be integrated in the main control valve, connecting pipelines of the hydraulic system are reduced, the cost of the whole crane is reduced, and oil leakage risk points of the pipeline of the whole crane can be reduced.
In the integrated main control valve, a damping hole is arranged on an oil path between the pilot liquid control end of each main valve core and the corresponding pilot control oil port, and the oil inlet of the valve core control electromagnetic valve is connected between the pilot liquid control end of the corresponding main valve core and the damping hole.
In the integrated main control valve, a three-way pressure compensation valve is further arranged in the oil inlet joint, an oil inlet end of the three-way pressure compensation valve is communicated with the P port, an oil return end of the three-way pressure compensation valve is communicated with an oil inlet end of the back pressure valve, and a control end of the three-way pressure compensation valve is connected with an LS oil path communicated with the LS port.
In the integrated main control valve, the oil return joint is provided with a pilot pressure control electromagnetic valve, a pressure reducing valve and a one-way valve which are connected in series, the oil inlet end of the pressure reducing valve is communicated with the oil inlet main oil way, the oil outlet end of the one-way valve is connected with the oil inlet end of the pilot pressure control electromagnetic valve, the oil outlet end of the pilot pressure control electromagnetic valve is communicated with the pressure relief oil way, and the oil return joint is provided with a pilot oil supply interface communicated with the oil outlet end of the one-way valve.
In the integrated main control valve, the oil return joint is also provided with an overflow valve, the oil inlet end of the overflow valve is communicated with the oil outlet end of the pressure reducing valve, and the oil outlet end of the overflow valve is communicated with the pressure relief oil way.
In the integrated main control valve, the telescopic oil cylinder switching valve is arranged in the oil return connection, the pilot control end of the telescopic oil cylinder switching valve is connected with the oil outlet end of the two-position three-way electromagnetic valve, the oil inlet end of the two-position three-way electromagnetic valve is communicated with the oil outlet end of the one-way valve, and the oil return end of the two-position three-way electromagnetic valve is communicated with the pressure relief oil way.
The technical scheme for realizing the purpose of the invention is as follows: the hydraulic system is used for controlling the automobile crane to get on the automobile and comprises a pilot handle and is characterized by further comprising the integrated main control valve, wherein the oil inlet end of the pilot handle is connected with a pilot oil supply interface on the oil return joint, and the pilot control oil outlet end of the pilot handle is correspondingly connected with each pilot control oil port on the integrated main control valve.
The technical scheme for realizing the purpose of the invention is as follows: the automobile crane is characterized by comprising the hydraulic system.
Compared with the prior art, the integrated main control valve can greatly reduce hydraulic elements and connecting pipelines of the whole machine, reduce the cost of the whole machine, reduce oil leakage risk points of the pipelines of the whole machine and improve the quality of the whole machine.
Drawings
Fig. 1 is a partial schematic diagram of a hydraulic system on a truck crane according to the invention.
Fig. 2 is a schematic diagram of an integrated main control valve of the present invention.
Fig. 3 is a schematic diagram of an oil inlet coupling portion of the integrated main control valve of the present invention.
Fig. 4 is a schematic diagram of a hoisting unit in the integrated main control valve according to the present invention.
Fig. 5 is a schematic diagram of the telescoping horn linkage section of the integrated master control valve of the present invention.
Fig. 6 is a schematic diagram of an oil return portion of the integrated main control valve according to the present invention.
Part names and serial numbers in the figure:
the hydraulic control system comprises an oil inlet coupling 1, a winch coupling 2, a telescopic amplitude coupling 3, an oil return coupling 4, a main pump 5, an integrated main control valve 6, a two-section arm cylinder 7, a multi-section arm cylinder 8, a pilot handle 9, a three-way pressure compensation valve 11, a back pressure valve 12, a first main valve element 21, a second main valve element 22, a valve element control electromagnetic valve 23, a damping hole 24, a third main valve element 31, a fourth main valve element 32, a switching oil path 33, an overflow valve 41, a telescopic cylinder switching valve 42, a two-position three-way electromagnetic valve 43, a constant flow valve 44, a main safety valve 45, a Ls overflow valve 46, a pilot pressure control electromagnetic valve 47, an overflow valve 48, an accumulator 49, a one-way valve 410, a pressure reducing valve 411, a pressure relief oil path 412.
Detailed Description
The following description of the embodiments refers to the accompanying drawings.
As shown in fig. 1, the hydraulic system on the truck crane is used for the loading control of the truck crane, and comprises a main pump 5, a pilot handle 9, an integrated main control valve 6 and a telescopic oil cylinder. The main pump 5 sucks hydraulic oil from a hydraulic oil tank to supply oil to the integrated main control valve 6, the integrated main control valve 6 reduces the pressure of the oil inlet main oil path and outputs the pressure oil as a pilot oil source to supply oil to the pilot handle 9, and the pilot handle 9 conveys pilot control pressure oil to a pilot control end of a main valve core correspondingly connected in the integrated main control valve 6 under the operation of an operator to realize corresponding action.
As shown in fig. 2, the integrated main control valve 6 comprises an oil inlet joint 1, a winch joint 2, a telescopic amplitude joint 3 and an oil return joint 4. The oil return oil paths of all the units are communicated with each other and then are connected with an oil return T port through a back pressure valve, and the oil inlet main oil path of each unit is communicated with the P port.
As shown in fig. 3, the oil inlet union 1 is provided with a P port, an oil return T port, and a pressure relief L port communicated with the pressure relief oil path. The oil inlet connection is internally provided with a three-way pressure compensation valve 11, the oil inlet end of the three-way pressure compensation valve 11 is communicated with the port P, the oil return end is communicated with the oil inlet end of the back pressure valve 12, and the control end is connected with an LS oil path communicated with the LS port.
As shown in fig. 4, a first main valve element 21 and a second main valve element 22 are provided in the hoisting unit 2 for controlling a main hoisting hydraulic motor and an auxiliary hoisting hydraulic motor (not shown), respectively. The oil inlet ends of the first main valve core 21 and the second main valve core 22 are connected with an oil inlet main oil path of the main valve core, the oil return end is connected with an oil return path of the main valve core, two working oil ports of the first main valve core 21 are connected with a main hoisting hydraulic motor through an A1 port and a B1 port, and two working oil ports of the second main valve core 22 are connected with an auxiliary hoisting hydraulic motor through an A2 port and a B2 port. Four pilot control ports, namely a port 1, a port b1, a port 2 and a port b2, are provided in the end cap of the pair. The ports a1 and b1 are respectively communicated with pilot control ends at two ends of the first main valve spool 21, and the ports a2 and b2 are respectively communicated with pilot control ends at two ends of the second main valve spool 22. And a damping hole 24 and a valve core control electromagnetic valve 23 are arranged between the pilot control ends at the two ends of the two main valve cores and the corresponding pilot control oil ports. The pilot control oil port is communicated with pilot control ends at two ends of the corresponding main valve core through a damping hole 24. The spool control solenoid valve 23 is a two-position two-way valve, an oil inlet of the spool control solenoid valve is connected between the corresponding main spool pilot hydraulic control end and the damping hole 24, and an oil outlet of the spool control solenoid valve 23 is communicated with a pressure relief oil path.
As shown in fig. 5, a third main valve element 31 and a fourth main valve element 32 are provided in the luffing jib 3, for controlling a luffing cylinder (not shown) and a telescopic cylinder, respectively. The oil inlet ends of the third main valve core 31 and the fourth main valve core 32 are connected with the oil inlet main oil path of the main valve core, the oil return end is connected with the oil return path of the main valve core, the working oil port of the third main valve core 31 is connected with the amplitude-variable oil cylinder through a port B3, and the working oil port of the fourth main valve core 32 is connected with the telescopic oil cylinder through a port B4 and used for returning oil when the telescopic oil cylinder retracts. Four pilot control ports, namely a port 3, a port b3, a port 4 and a port b4, are provided in the end cap of the pair. The ports a3 and b3 are respectively communicated with pilot control ends at two ends of the third main valve spool 31, and the ports a3 and b4 are respectively communicated with pilot control ends at two ends of the fourth main valve spool 32. In the telescopic amplitude-variable connection, as in the hoisting connection, a damping hole 24 and a valve core control electromagnetic valve 23 are arranged between the pilot control ends at the two ends of the two main valve cores and the corresponding pilot control oil ports. The pilot control oil port is communicated with pilot control ends at two ends of the main valve core through a damping hole 24. The spool control solenoid valve 23 is a two-position two-way valve, an oil inlet thereof is connected between the pilot hydraulic control end of the corresponding main spool and the damping hole, and an oil outlet thereof is communicated with the pressure relief oil path.
As shown in fig. 1, the telescopic cylinder includes a two-joint arm cylinder 7 and a multi-joint arm cylinder 8. The two-section arm oil cylinder 7 is used for driving the two-section arm to extend and retract relative to the basic arm. Three-section arm, four-section arm and five-section arm (existing in five-section arm crane, a multi-section arm oil cylinder is generally called three-four-five-section arm oil cylinder) of the crane share the multi-section arm oil cylinder for expansion. The extension control of the two-section arm cylinder 7 and the multi-section arm cylinder 8 is switched by a telescopic cylinder switching valve 42, the telescopic cylinder switching valve 42 is arranged in an oil return connection, and a pressure reducing valve 411 is further arranged in the oil return connection to realize pilot oil supply.
As shown in fig. 5, a pilot pressure control solenoid valve 47, an overflow valve 48, and a pressure reducing valve 411 and a check valve 410 connected in series are provided in the oil return line, an oil inlet end of the pressure reducing valve 411 is communicated with an oil inlet main oil passage, an oil outlet end of the check valve 410 is connected with an oil inlet end of a pilot pressure control solenoid valve 4747, and an oil outlet end of the pilot pressure control solenoid valve 47 is communicated with a pressure relief oil passage 412. The oil inlet end of the overflow valve 48 is communicated with the oil outlet end of the pressure reducing valve, and the oil outlet end of the overflow valve is communicated with the pressure relief oil path. The oil return joint is provided with a pilot oil supply port X1 communicated with the oil outlet end of the one-way valve 410.
The telescopic cylinder switching valve 42 is a two-position four-way valve, a first oil port of the telescopic cylinder switching valve is communicated with a port B5 on the end cover, a second oil port of the telescopic cylinder switching valve is communicated with a port A5 on the end cover, a third oil port of the telescopic cylinder switching valve is communicated with a working oil port (an oil port communicated with a port A4) of a fourth main valve core 32 in the telescopic variable-amplitude connector 3 through a switching oil path 33, and a fourth oil port of the telescopic cylinder switching valve is communicated with an oil return. The pilot hydraulic control end of the telescopic cylinder switching valve 42 is connected with a two-position three-way electromagnetic valve 43. The oil inlet end of the two-position three-way solenoid valve 43 is communicated with the oil outlet end of the one-way valve 410, the oil outlet end of the two-position three-way solenoid valve 43 is connected with the pilot hydraulic control end of the telescopic cylinder switching valve 42, and the oil return end of the two-position three-way solenoid valve 43 is communicated with the pressure relief oil path 412. The port B5 is connected with the two-section arm oil cylinder 7, and the port A5 is connected with the multi-section arm oil cylinder. The switching valve 42 of the telescopic cylinder is controlled by the two-position three-way electromagnetic valve 43, so that the third oil port is communicated with the first oil port or the second oil port. When the third port is communicated with the first port, the pressure oil flows out from the working port of the fourth main valve core 32, enters the second-section arm cylinder 7, and extends, and when the third port is communicated with the second port, the pressure oil flows out from the working port of the fourth main valve core 32, enters the multi-section arm cylinder 8, and extends. When the two-section arm oil cylinder 7 and the multi-section arm oil cylinder 8 retract, oil returned by the oil cylinders returns from the oil port B4 of the telescopic luffing connector 3 through the fourth main valve core 32.
As shown in fig. 6, in the oil return connection, a constant flow valve 44 and a Ls relief valve 46 are connected between the Ls oil path 415 and the oil return path 413, and a main relief valve 45 is provided between the oil inlet main oil path and the oil return path. The LS port is provided in the oil return line and communicates with the LS oil passage 415.
The integrated main control valve 6 is connected with the pilot handle 9 through a pilot oil supply port X1 on the oil return link, and provides a pilot pressure oil source for pilot control to the pilot handle 9. The pilot handle 9 outputs pilot control oil to the pilot control ends of the main valve cores of the winch link 2 and the telescopic amplitude-variable link 3 under the control and swing of an operator so as to realize corresponding action control. In order to realize the pressure stabilization at the pilot oil supply interface, the integrated main control valve 6 is provided with an energy accumulator 49 communicated with the oil outlet end of the one-way valve.
In this embodiment, the pilot oil supply valve composed of the pressure reducing valve 411, the check valve 410, and the pilot pressure control solenoid valve 47 is integrated in the main control valve, so that the number of hydraulic components and connecting lines of the whole machine is reduced, the cost of the whole machine is reduced, and the risk of oil leakage of the whole machine line can be reduced. The oil outlet end of the pilot pressure control solenoid valve 47 communicates with the relief oil passage 412. The pressure relief oil passage 412 is provided with no back pressure valve, and the pressure is lower than that of the oil return passage 413, so that the pressure of the pilot handle can be cut off in a quick response mode when the pilot pressure is cut off. In the hoisting connection 2 and the telescopic amplitude-changing connection 3, the valve core control electromagnetic valve 23 is provided with only two oil ports, and the integration and the arrangement on the integrated main control valve are convenient.
Claims (8)
1. An integrated main control valve is used for controlling a hydraulic system of a crane to get on a vehicle and comprises an oil inlet joint (1), a winch joint (2), a telescopic amplitude joint (3) and an oil return joint (4), wherein the oil inlet joint (1) is provided with a P port, an oil return T port and a pressure relief L port communicated with a pressure relief oil path (412); the oil return oil paths (413) of all the units are communicated with each other and then are connected with an oil return T port through a back pressure valve (12), and the oil inlet main oil path (414) of each unit is communicated with the P port; the winch (2) and the telescopic amplitude variation (3) are provided with pilot control oil ports communicated with pilot control ends of main valve cores of the winch and the telescopic amplitude variation (3);
the hydraulic control system is characterized in that pilot hydraulic control ends of main valves in the winch connection (2) and the telescopic amplitude-varying connection (3) are connected with valve core control electromagnetic valves (23), oil inlet ends of the valve core control electromagnetic valves (23) are connected with the pilot hydraulic control ends of the main valves, and oil outlet ends of the valve core control electromagnetic valves are communicated with a pressure relief oil path (412).
2. The integrated main control valve according to claim 1, wherein a damping hole (24) is provided on an oil path between the pilot-controlled end of each main spool and the corresponding pilot-controlled oil port, and the oil inlet of the spool control solenoid valve (23) is connected between the pilot-controlled end of the corresponding main spool and the damping hole (24).
3. The integrated main control valve according to claim 1 or 2, characterized in that a three-way pressure compensation valve (11) is further arranged in the oil inlet joint (1), an oil inlet end of the three-way pressure compensation valve is communicated with the P port, an oil return end of the three-way pressure compensation valve is communicated with an oil inlet end of the back pressure valve (12), and a control end of the three-way pressure compensation valve is connected with an LS oil path (415) communicated with the LS port.
4. The integrated main control valve according to claim 3, wherein a pilot pressure control solenoid valve (47) and a pressure reducing valve (411) and a check valve (410) which are connected in series are arranged in the oil return connection (4), an oil inlet end of the pressure reducing valve (410) is communicated with an oil inlet main oil path (414), an oil outlet end of the check valve (410) is connected with an oil inlet end of the pilot pressure control solenoid valve (47), an oil outlet end of the pilot pressure control solenoid valve (47) is communicated with a pressure relief oil path (412), and a pilot oil supply interface communicated with an oil outlet end of the check valve (410) is arranged on the oil return connection (4).
5. The integrated main control valve according to claim 4, wherein an overflow valve (48) is further arranged in the oil return joint (4), an oil inlet end of the overflow valve (48) is communicated with an oil outlet end of the pressure reducing valve (411), and an oil outlet end of the overflow valve (48) is communicated with the pressure relief oil path (412).
6. The integrated main control valve according to claim 4 or 5, characterized in that a telescopic cylinder switching valve (42) is arranged in the oil return union (4), a pilot control end of the telescopic cylinder switching valve (42) is connected with an oil outlet end of a two-position three-way solenoid valve (43), an oil inlet end of the two-position three-way solenoid valve (43) is communicated with an oil outlet end of the one-way valve (410), and an oil return end of the two-position three-way solenoid valve (43) is communicated with a pressure relief oil path (412).
7. A hydraulic system for controlling the loading of an automobile crane, comprising a pilot handle (9), and further comprising an integrated main control valve (6) according to any one of claims 4 to 6, wherein the oil inlet end of the pilot handle (9) is connected to a pilot oil supply port of the oil return line, and the pilot oil outlet end of the pilot handle (9) is correspondingly connected to each pilot oil port of the integrated main control valve.
8. A truck crane characterized by the hydraulic system of claim 7.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110140827.2A CN112797042A (en) | 2021-02-02 | 2021-02-02 | Integrated main control valve, hydraulic system and crane |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110140827.2A CN112797042A (en) | 2021-02-02 | 2021-02-02 | Integrated main control valve, hydraulic system and crane |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN112797042A true CN112797042A (en) | 2021-05-14 |
Family
ID=75813667
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110140827.2A Pending CN112797042A (en) | 2021-02-02 | 2021-02-02 | Integrated main control valve, hydraulic system and crane |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN112797042A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113464514A (en) * | 2021-07-30 | 2021-10-01 | 湖南三一中型起重机械有限公司 | Integrated electric control multi-way valve and crane |
-
2021
- 2021-02-02 CN CN202110140827.2A patent/CN112797042A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113464514A (en) * | 2021-07-30 | 2021-10-01 | 湖南三一中型起重机械有限公司 | Integrated electric control multi-way valve and crane |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US7752842B2 (en) | Circuit for controlling a double-action hydraulic drive cylinder | |
| US9303632B2 (en) | Energy recovery control circuit and work machine | |
| WO2020006932A1 (en) | Bucket leveling system for aerial work truck | |
| JPH081202B2 (en) | Operating circuit of single-acting hydraulic cylinder | |
| US20180112686A1 (en) | Hydraulic actuator system of vehicle having secondary load-holding valve with tank connection | |
| GB2440810A (en) | Control valves | |
| CN102788055A (en) | Hydraulic system of wrecker | |
| US7059237B2 (en) | Multiple-directional switching valve | |
| EP3280847B1 (en) | A load sensing hydraulic system for a working machine, and a method for controlling a load sensing hydraulic system | |
| CN112797042A (en) | Integrated main control valve, hydraulic system and crane | |
| US10982691B2 (en) | System and method for controlling construction machine | |
| CN214698545U (en) | Integrated main control valve, hydraulic system and crane | |
| CN210655875U (en) | Hydraulic control system of folding arm type lorry-mounted crane | |
| CN210565409U (en) | Crane with a movable crane | |
| CN104179739B (en) | The two-way Confluent control system of double pump and apply the fire fighting truck of this system | |
| CN209875588U (en) | Oil source valve, hydraulic system and engineering machinery | |
| CN205779975U (en) | A kind of descending valve plate of fork truck electro-hydraulic proportional multi-way valve | |
| CN112855650B (en) | Landing leg hydraulic control system and crane | |
| KR100923396B1 (en) | Variable Priority System of Attachment on Excavator | |
| CN219176676U (en) | Control valve group, hydraulic system and operation machine | |
| CN217557055U (en) | Electrically-controlled full-variable hydraulic system and loader | |
| CN218235644U (en) | Hydraulic control system and working machine | |
| CN111677704B (en) | Hydraulic system and engineering machinery | |
| CN217558669U (en) | Hydraulic system main valve and working machine | |
| CN217759049U (en) | Pilot signal valve group, full-variable hydraulic system and loader |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| TA01 | Transfer of patent application right |
Effective date of registration: 20230327 Address after: 545000 No. 6, Yangtai Road, Yanghe industrial new area, Liuzhou City, Guangxi Zhuang Autonomous Region Applicant after: Guangxi Zhongyuan Machinery Co.,Ltd. Applicant after: ANHUI LIUGONG CRANE Co.,Ltd. Applicant after: GUANGXI LIUGONG MACHINERY Co.,Ltd. Address before: 545006 No.1 Hexiang Road (Yanghe industrial new area), Yufeng District, Liuzhou City, Guangxi Zhuang Autonomous Region 545006 Applicant before: LIUZHOU LIUGONG HYDRAULIC COMPONENTS Co.,Ltd. Applicant before: ANHUI LIUGONG CRANE Co.,Ltd. Applicant before: GUANGXI LIUGONG MACHINERY Co.,Ltd. |
|
| TA01 | Transfer of patent application right |