CN110608207B - Emergency unloading device for hydraulic actuating element of engineering machinery - Google Patents

Emergency unloading device for hydraulic actuating element of engineering machinery Download PDF

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Publication number
CN110608207B
CN110608207B CN201910887312.1A CN201910887312A CN110608207B CN 110608207 B CN110608207 B CN 110608207B CN 201910887312 A CN201910887312 A CN 201910887312A CN 110608207 B CN110608207 B CN 110608207B
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CN
China
Prior art keywords
pilot
unloading
engineering machinery
actuating element
hydraulic actuating
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Active
Application number
CN201910887312.1A
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Chinese (zh)
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CN110608207A (en
Inventor
周良峰
罗成发
胡勇
高皓
玉有恩
陈宗宜
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Guangxi Liugong Machinery Co Ltd
Liugong Changzhou Machinery Co Ltd
Liuzhou Liugong Excavators Co Ltd
Original Assignee
Guangxi Liugong Machinery Co Ltd
Liugong Changzhou Machinery Co Ltd
Liuzhou Liugong Excavators Co Ltd
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Application filed by Guangxi Liugong Machinery Co Ltd, Liugong Changzhou Machinery Co Ltd, Liuzhou Liugong Excavators Co Ltd filed Critical Guangxi Liugong Machinery Co Ltd
Priority to CN201910887312.1A priority Critical patent/CN110608207B/en
Publication of CN110608207A publication Critical patent/CN110608207A/en
Application granted granted Critical
Publication of CN110608207B publication Critical patent/CN110608207B/en
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B1/00—Installations or systems with accumulators; Supply reservoir or sump assemblies
    • F15B1/02—Installations or systems with accumulators
    • F15B1/022—Installations or systems with accumulators used as an emergency power source, e.g. in case of pump failure
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B11/00—Servomotor systems without provision for follow-up action; Circuits therefor
    • F15B11/16—Servomotor systems without provision for follow-up action; Circuits therefor with two or more servomotors
    • F15B11/17—Servomotor systems without provision for follow-up action; Circuits therefor with two or more servomotors using two or more pumps
    • 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
    • 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
    • F15B20/00—Safety arrangements for fluid actuator systems; Applications of safety devices in fluid actuator systems; Emergency measures for fluid actuator systems
    • 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
    • F15B20/00—Safety arrangements for fluid actuator systems; Applications of safety devices in fluid actuator systems; Emergency measures for fluid actuator systems
    • F15B20/002—Electrical failure
    • 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
    • F15B21/00—Common features of fluid actuator systems; Fluid-pressure actuator systems or details thereof, not covered by any other group of this subclass
    • F15B21/04—Special measures taken in connection with the properties of the fluid
    • F15B21/041—Removal or measurement of solid or liquid contamination, e.g. filtering
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/20—Fluid pressure source, e.g. accumulator or variable axial piston pump
    • F15B2211/205—Systems with pumps
    • F15B2211/2053—Type of pump
    • F15B2211/20538—Type of pump constant capacity
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/20—Fluid pressure source, e.g. accumulator or variable axial piston pump
    • F15B2211/205—Systems with pumps
    • F15B2211/2053—Type of pump
    • F15B2211/20546—Type of pump variable capacity
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/20—Fluid pressure source, e.g. accumulator or variable axial piston pump
    • F15B2211/205—Systems with pumps
    • F15B2211/20576—Systems with pumps with multiple pumps
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/60—Circuit components or control therefor
    • F15B2211/615—Filtering means
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/70—Output members, e.g. hydraulic motors or cylinders or control therefor
    • F15B2211/71—Multiple output members, e.g. multiple hydraulic motors or cylinders
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/80—Other types of control related to particular problems or conditions
    • F15B2211/86—Control during or prevention of abnormal conditions
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/80—Other types of control related to particular problems or conditions
    • F15B2211/86—Control during or prevention of abnormal conditions
    • F15B2211/862—Control during or prevention of abnormal conditions the abnormal condition being electric or electronic failure

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Analytical Chemistry (AREA)
  • Fluid-Pressure Circuits (AREA)

Abstract

The invention discloses an emergency unloading device for a hydraulic actuating element of engineering machinery, which belongs to the technical field of engineering machinery and comprises an unloading interface connected with the hydraulic actuating element of the engineering machinery and an unloading speed regulator connected with an oil tank; a detachable connecting pipe is connected between the unloading interface and the unloading speed regulator; the unloading speed regulator comprises a speed regulating throttle valve and a first pressure measuring joint which are connected in series; the unloading interface comprises a second pressure measuring joint and a pressure sensor which are connected in series; the connecting pipe is arranged between the first pressure measuring joint and the second pressure measuring joint. The invention can solve the problem that the hydraulic actuating element of the existing engineering machinery cannot be unloaded due to the fact that the whole machine cannot be electrified or the pilot unlocking solenoid valve is damaged or the energy accumulator is damaged.

Description

Emergency unloading device for hydraulic actuating element of engineering machinery
Technical Field
The invention relates to the technical field of engineering machinery, in particular to an emergency unloading device for a hydraulic actuating element of the engineering machinery.
Background
The hydraulic executing element of the engineering machinery is a device which utilizes fluid energy to do mechanical work in a hydraulic system of the engineering machinery to realize various actions of the whole machine. Generally, in order to ensure normal operation and maintenance of the engineering machinery and avoid safety accidents caused by the disassembly and assembly of hydraulic elements of the whole machine under the high-pressure state of oil, the routine maintenance, the maintenance or the repair of unloading the high-pressure oil in an execution element chamber to an oil tank must be carried out after the engineering machinery is shut down. A hydraulic system of engineering machinery comprises a hydraulic actuating element, a multi-way reversing valve, a pilot accumulator and a pilot unlocking electromagnetic valve, wherein a pressure oil source is provided by a hydraulic pump; a pilot control handle is arranged between the control end of the multi-way reversing valve and the pilot unlocking electromagnetic valve; the unloading scheme of the hydraulic actuating element of the engineering machinery is that a pilot energy accumulator is filled with liquid to accumulate certain pressure energy when the engineering machinery works, after the engineering machinery is stopped, the whole machine is powered on under the state that an engine is not started, so that the pilot unlocking electromagnetic valve is controlled to be powered on and reversed, a pilot operating handle is communicated with pressure oil in the pilot energy accumulator, the oil is filled with liquid through the energy accumulator to have certain pressure energy, the pilot operating handle pushes a multi-way reversing valve to be reversed, and then the high-pressure oil in an actuating element cavity can be unloaded and returned to a tank. However, in practical application, once the engineering machinery cannot be powered on due to the fault of an electrical system or the pilot-operated unlocking solenoid valve is damaged or the energy accumulator is damaged, the problems of potential safety hazard and inconvenient maintenance caused by the fact that the execution element cannot be unloaded are caused.
Disclosure of Invention
The invention provides an emergency unloading device for a hydraulic actuating element of engineering machinery, which can solve the problem that the hydraulic actuating element of the existing engineering machinery cannot be unloaded due to the fact that the whole machine cannot be electrified or a pilot unlocking solenoid valve is damaged or an energy accumulator is damaged.
In order to solve the problems, the technical scheme adopted by the invention is as follows: the emergency unloading device for the hydraulic actuating element of the engineering machinery comprises an unloading interface connected with the hydraulic actuating element of the engineering machinery and an unloading speed regulator connected with an oil tank; and a detachable connecting pipe is connected between the unloading interface and the unloading speed regulator.
In the above technical solution, a more specific technical solution may also be: the unloading speed regulator comprises a speed regulating throttle valve and a first pressure measuring joint which are connected in series; the unloading interface comprises a second pressure measuring joint and a pressure sensor which are connected in series; the connecting pipe is arranged between the first pressure measuring joint and the second pressure measuring joint.
Further: the hydraulic actuating element is an oil cylinder, a rodless cavity of the oil cylinder is connected with the unloading interface and one working oil port of the multi-way reversing valve, and a rod cavity of the oil cylinder is connected with the other working oil port of the multi-way reversing valve; and an oil inlet of the multi-way reversing valve is connected with the hydraulic pump.
Further: a pilot operating handle is arranged between the two pilot control ends of the multi-way reversing valve, and the pilot operating handle is provided with an unloading pilot oil input port; a pilot energy accumulator is arranged between the hydraulic pump and the oil tank; and a pilot unlocking solenoid valve is arranged between the pilot energy accumulator and an unloading pilot oil input port of the pilot control handle.
Further: a one-way valve is arranged between the pilot unlocking electromagnetic valve and the pilot energy accumulator; and a filter is arranged between the pilot accumulator and the hydraulic pump.
Further: the connecting pipe is a measuring hose.
Due to the adoption of the technical scheme, compared with the prior art, the invention has the following beneficial effects:
1. the emergency unloading device comprises an unloading interface connected with a hydraulic actuating element of the engineering machinery and an unloading speed regulator connected with an oil tank; a detachable connecting pipe is connected between the unloading interface and the unloading speed regulator; the existing hydraulic system of the engineering machinery is not required to be modified, and the connecting pipe is not assembled on the whole excavator, and belongs to the technical field that vehicle-mounted accessories of the whole excavator are placed in a maintenance bag; the unloading speed regulator and the unloading interface are assembled on the excavator; when the engineering machinery cannot be electrified or the pilot unlocking solenoid valve is damaged or the energy accumulator is damaged due to the fault of an electrical system, the connecting pipe is connected between the unloading speed regulator and the unloading interface, and pressure oil in the hydraulic execution element can be unloaded and returned to the oil tank under the action of the dead weight of the working device, so that the potential safety hazard is avoided, and the daily maintenance, the maintenance or the repair of the whole machine is ensured.
2. The unloading speed regulator comprises a speed regulating throttle valve and a first pressure measuring joint which are connected in series; the unloading interface comprises a second pressure measuring joint and a pressure sensor which are connected in series; the speed regulating throttle valve can control the descending speed of the oil cylinder; the pressure sensor can detect the pressure value at the unloading position of the oil cylinder in real time, the unloading speed is controllable, the operation is convenient, and the safety of pressure oil unloading in the hydraulic actuating element is further realized.
3. Because a pilot control handle is arranged between the two pilot control ends of the multi-way reversing valve, the pilot control handle is provided with an unloading pilot oil input port; a pilot energy accumulator is arranged between the hydraulic pump and the oil tank; a pilot unlocking solenoid valve is arranged between the pilot energy accumulator and an unloading pilot oil input port of the pilot control handle; the whole engine can be electrified under the state that the engine is not started, so that the pilot unlocking solenoid valve is controlled to be electrified and reversed, pilot pressure oil accumulated in the pilot energy accumulator pushes the multi-way reversing valve to be reversed through the pilot control handle, and high-pressure oil in the cavity of the execution element is unloaded and returns to the oil tank; therefore, the maintenance after the normal shutdown of the whole machine is ensured.
Drawings
FIG. 1 is a hydraulic schematic of an embodiment of the present invention.
Detailed Description
The invention will be further described in detail with reference to the following examples:
the emergency unloading device for the hydraulic actuating element of the engineering machinery shown in fig. 1 comprises an unloading interface 5 connected with the hydraulic actuating element of the engineering machinery and an unloading speed regulator 3 connected with an oil tank 10; a detachable connecting pipe 4 is connected between the unloading interface 5 and the unloading speed regulator 3; the connecting pipe 4 is a measuring hose; the unloading speed regulator 3 comprises a speed regulating throttle valve 31 and a first pressure measuring joint 32, wherein the speed regulating throttle valve 31 is connected with the first pressure measuring joint 32 in series; the unloading interface 5 comprises a second pressure measuring joint 51 and a pressure sensor 52, and the second pressure measuring joint 51 is connected with the pressure sensor 52 in series; the connection pipe 4 is connected between the first pressure tap 32 and the second pressure tap 51; the hydraulic actuating element is an oil cylinder 6, a rodless cavity of the oil cylinder 6 is connected with a pressure sensor 52, a second pressure measuring joint 51 and one working oil port 7a of the multi-way reversing valve 7, and a rod cavity of the oil cylinder 6 is connected with the other working oil port 7b of the multi-way reversing valve 7; an oil inlet 7P of the multi-way reversing valve 7 is connected with a hydraulic pump 8, the hydraulic pump 8 comprises a variable main pump 82 and a pilot constant delivery pump 81, the oil inlet 7P of the multi-way reversing valve 7 is connected with an oil outlet of the variable main pump 82, and an oil return port 7T of the multi-way reversing valve 7 is connected with an oil tank 10; the multi-way reversing valve 7 is provided with two pilot control ends, namely a pilot control end 7A and a pilot control end 7B, a pilot control handle 2 is arranged between the pilot control end 7A and the pilot control end 7B, the pilot control handle 2 is provided with an unloading pilot oil input port 2a, the unloading pilot oil input port 2a of the pilot control handle 2 is connected with an oil outlet 9B of a pilot unlocking electromagnetic valve 9, an oil inlet 9a of the pilot unlocking electromagnetic valve 9 is connected with an oil outlet 12B of a one-way valve 12, and an oil inlet 12a of the one-way valve 12 is connected with one ends of a pilot energy accumulator 11 and a filter 13; the other end of the filter 13 is connected to an oil outlet of the pilot constant delivery pump 81.
When the pilot-operated constant delivery pump works, the pilot-operated constant delivery pump charges the pilot energy accumulator to accumulate pressure energy, after the engineering machinery is shut down, the whole machine is powered on under the condition that the engine is not started, so that the pilot-operated unlocking electromagnetic valve is powered on to be reversed, pilot-operated pressure oil accumulated in the pilot energy accumulator pushes the multi-way reversing valve to be reversed through the pilot-operated handle, and high-pressure oil in the execution element cavity is unloaded and returns to the oil tank. When the engineering machinery cannot be electrified or the pilot unlocking solenoid valve is damaged or the energy accumulator is damaged due to the fault of an electrical system, the connecting pipe is connected between the unloading speed regulator and the unloading interface, pressure oil in the hydraulic execution element can be unloaded and returned to the oil tank under the action of the dead weight of the working device, the process is controllable, the potential safety hazard is avoided, and the daily maintenance, the maintenance or the repair of the whole machine is ensured.

Claims (5)

1. The emergency unloading device for the hydraulic actuating element of the engineering machinery is characterized in that: comprises an unloading interface connected with a hydraulic actuating element of the engineering machinery and an unloading speed regulator connected with an oil tank; a detachable connecting pipe is connected between the unloading interface and the unloading speed regulator, and is connected between the unloading speed regulator and the unloading interface when the engineering machinery cannot be electrified due to the fault of an electrical system or a pilot unlocking electromagnetic valve is damaged or an energy accumulator is damaged; the unloading speed regulator comprises a speed regulating throttle valve and a first pressure measuring joint which are connected in series; the unloading interface comprises a second pressure measuring joint and a pressure sensor which are connected in series; the connecting pipe is arranged between the first pressure measuring joint and the second pressure measuring joint.
2. The emergency unloading device for the hydraulic actuating element of the engineering machinery as claimed in claim 1, wherein: the hydraulic actuating element is an oil cylinder, a rodless cavity of the oil cylinder is connected with the unloading interface and one working oil port of the multi-way reversing valve, and a rod cavity of the oil cylinder is connected with the other working oil port of the multi-way reversing valve; and an oil inlet of the multi-way reversing valve is connected with the hydraulic pump.
3. The emergency unloading device for the hydraulic actuating element of the engineering machinery as claimed in claim 2, wherein: a pilot operating handle is arranged between the two pilot control ends of the multi-way reversing valve, and the pilot operating handle is provided with an unloading pilot oil input port; a pilot energy accumulator is arranged between the hydraulic pump and the oil tank; and a pilot unlocking solenoid valve is arranged between the pilot energy accumulator and an unloading pilot oil input port of the pilot control handle.
4. The emergency unloading device for the hydraulic actuating element of the engineering machinery as claimed in claim 3, wherein: a one-way valve is arranged between the pilot unlocking electromagnetic valve and the pilot energy accumulator; and a filter is arranged between the pilot accumulator and the hydraulic pump.
5. The emergency unloading device for the hydraulic actuating element of the engineering machinery as claimed in claim 4, wherein: the connecting pipe is a measuring hose.
CN201910887312.1A 2019-09-19 2019-09-19 Emergency unloading device for hydraulic actuating element of engineering machinery Active CN110608207B (en)

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CN110608207B true CN110608207B (en) 2021-05-14

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Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1800654A (en) * 2005-12-20 2006-07-12 武汉科技大学 Asymmetric cylinder closed-loop speed system controlled by electro-hydraulic proportional pump
CN201817846U (en) * 2010-10-14 2011-05-04 天津玖丰重工机械有限公司 Pilot controlled system for false action of excavator
CN103276762A (en) * 2013-05-28 2013-09-04 上海三一重机有限公司 Structure for improving bucket rod suction and hydraulic excavator
CN103603836A (en) * 2013-11-28 2014-02-26 长沙中联消防机械有限公司 working bucket hydraulic control system and engineering vehicle
CN204553374U (en) * 2014-12-30 2015-08-12 辽宁海龙科技股份有限公司 A kind of Working arm of furance detatching machine controller for lifting and hydraulic system thereof
CN105909582A (en) * 2016-06-30 2016-08-31 马鞍山市致呈机电有限公司 Hydraulic system of steel ladle hydraulic turnover device
CN205937259U (en) * 2016-05-27 2017-02-08 徐工集团工程机械股份有限公司科技分公司 Integrated valve block and system based on load feedback control
CN107700578A (en) * 2017-09-30 2018-02-16 山东临工工程机械有限公司 Loading machine hydraulic system of working
CN108678062A (en) * 2018-06-25 2018-10-19 山东临工工程机械有限公司 Loading machine stable module system

Patent Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1800654A (en) * 2005-12-20 2006-07-12 武汉科技大学 Asymmetric cylinder closed-loop speed system controlled by electro-hydraulic proportional pump
CN201817846U (en) * 2010-10-14 2011-05-04 天津玖丰重工机械有限公司 Pilot controlled system for false action of excavator
CN103276762A (en) * 2013-05-28 2013-09-04 上海三一重机有限公司 Structure for improving bucket rod suction and hydraulic excavator
CN103603836A (en) * 2013-11-28 2014-02-26 长沙中联消防机械有限公司 working bucket hydraulic control system and engineering vehicle
CN204553374U (en) * 2014-12-30 2015-08-12 辽宁海龙科技股份有限公司 A kind of Working arm of furance detatching machine controller for lifting and hydraulic system thereof
CN205937259U (en) * 2016-05-27 2017-02-08 徐工集团工程机械股份有限公司科技分公司 Integrated valve block and system based on load feedback control
CN105909582A (en) * 2016-06-30 2016-08-31 马鞍山市致呈机电有限公司 Hydraulic system of steel ladle hydraulic turnover device
CN107700578A (en) * 2017-09-30 2018-02-16 山东临工工程机械有限公司 Loading machine hydraulic system of working
CN108678062A (en) * 2018-06-25 2018-10-19 山东临工工程机械有限公司 Loading machine stable module system

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