CN112539204A - Electric proportional pump emergency control device and concrete pump truck - Google Patents
Electric proportional pump emergency control device and concrete pump truck Download PDFInfo
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- CN112539204A CN112539204A CN202011537866.8A CN202011537866A CN112539204A CN 112539204 A CN112539204 A CN 112539204A CN 202011537866 A CN202011537866 A CN 202011537866A CN 112539204 A CN112539204 A CN 112539204A
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- 239000003921 oil Substances 0.000 claims description 201
- 239000010720 hydraulic oil Substances 0.000 claims description 20
- 230000007704 transition Effects 0.000 claims description 20
- 238000006073 displacement reaction Methods 0.000 claims description 16
- 230000001502 supplementing effect Effects 0.000 claims description 15
- 238000000034 method Methods 0.000 claims description 7
- 230000009471 action Effects 0.000 description 5
- 238000005086 pumping Methods 0.000 description 5
- 230000002457 bidirectional effect Effects 0.000 description 4
- 230000008569 process Effects 0.000 description 4
- 238000001816 cooling Methods 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- 230000007246 mechanism Effects 0.000 description 2
- 239000013589 supplement Substances 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000017525 heat dissipation Effects 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 239000000047 product Substances 0.000 description 1
- 230000004044 response Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
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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
- 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
- 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
- F15B21/042—Controlling the temperature of the fluid
- F15B21/0423—Cooling
-
- 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
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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 electric proportional pump emergency control device and a concrete pump truck, and belongs to the field of concrete pump trucks.
Description
Technical Field
The invention relates to the technical field of concrete pump trucks, in particular to an electric proportional pump emergency control device and a concrete pump truck.
Background
Along with the development of the concrete pump truck towards the long cantilever crane, the closed hydraulic system is stable in reversing and small in impact, the electric proportional closed bidirectional variable pump directly drives the main oil cylinder to work, the oil pump and the main oil cylinder are not provided with complex hydraulic valve groups, the power loss is small, and the electric proportional closed bidirectional variable pump is more and more widely applied to the long cantilever crane pump truck pumping hydraulic system. However, the existing electric proportional closed bidirectional variable displacement pump has no emergency control function, if an electric control system fails or a main oil pump proportional electromagnet fails, a pumping hydraulic system cannot work, and due to the particularity of concrete pumping mechanical equipment, concrete is filled in a distributing pipe, a concrete cylinder and an S valve, and if the concrete cannot be processed in time, the concrete is solidified quickly, so that the equipment is very unfavorable, and great maintenance cost is caused. Therefore, an emergency control system of the electric proportional closed type bidirectional variable pump is very important.
Disclosure of Invention
The invention aims to solve the defects in the prior art, and provides an electric proportional pump emergency control device and a concrete pump truck.
In order to achieve the purpose, the invention adopts the following technical scheme:
an emergency control device of an electric proportional pump comprises a main oil pump system, a hydraulic oil tank, a first main oil cylinder and a second main oil cylinder connected with the first main oil cylinder;
the main oil pump system comprises a variable pump, a variable cylinder, a safety oil supplementing valve, a first overflow valve, a reversing valve, a second overflow valve and an emergency control module;
the hydraulic control system comprises a variable cylinder, an emergency control module, a main oil way I, a main oil way II, an overflow valve I, a hydraulic oil tank, a main oil way II, a safety oil supplementing valve II, an overflow valve I, a safety oil supplementing valve II and a safety oil supplementing valve II, wherein the hydraulic oil tank is connected with the hydraulic oil tank through an oil way;
the variable displacement pump is connected with the first main oil cylinder through the first main oil way and connected with the second main oil cylinder through the second main oil way, the first main oil way and the second main oil way are connected with the reversing valve together, the reversing valve is connected with the second overflow valve, and the second overflow valve is connected with the hydraulic oil tank.
According to a further preferred scheme, the emergency control module comprises a transition hydraulic valve and a manual reversing valve, the transition hydraulic valve comprises a proportional valve and a transition valve body, the transition valve body with an oil channel inside is additionally arranged on two electromagnets of the proportional valve, the oil channel inside the transition valve body is connected with an oil port corresponding to the proportional valve respectively, the transition valve body is connected with the manual reversing valve, the oil port corresponding to the manual reversing valve is connected with a main oil way III, and when the electromagnets of the proportional valve are damaged, reversing of the main oil pump system is controlled through the manual reversing valve.
Further preferably, the manual reversing valve is a three-position four-way manual reversing valve.
Further preferably, the proportional valve is a three-position four-way electromagnetic proportional valve.
Further preferably, the hot oil shuttle valve is a three-position one-way reversing valve.
A control method of an electric proportional pump emergency control device comprises the following steps:
the oil inlet of the manual reversing valve is taken from the outlet main oil way III of the oil supplementing pump, when the electromagnet of the proportional valve fails, the manual reversing valve is manually controlled to be in a left position state, the switching proportional valve is in the left position state, pressure oil enters a left cavity of the variable cylinder, the piston of the variable cylinder is pushed to move rightwards, so that the pressure oil in a right cavity enters the hydraulic oil tank, and the variable pump has displacement after the piston of the variable cylinder moves, so that an emergency working condition is realized; when the manual control manual reversing valve is in a right position state, the switching proportional valve is in the right position state, pressure oil enters a right cavity of the variable cylinder and pushes a piston of the variable cylinder to move leftwards, so that the pressure oil in a left cavity enters the hydraulic oil tank, the variable pump has displacement to reverse after the piston of the variable cylinder moves, and finally reversing under emergency working conditions is achieved.
A concrete pump truck comprising an electric proportional pump emergency control device as claimed in any one of claims.
Compared with the prior art, the invention has the following beneficial effects:
the emergency control module consists of a transition hydraulic valve and a manual reversing valve, pressure oil is led out from a Ps port of a shell of the main oil pump to an oil inlet of the manual reversing valve, when an electric control system fails or a proportional electromagnet of the main oil pump fails, the manual reversing valve is operated to carry out reversing control on the main oil pump, reversing of the main oil pump realizes reciprocating motion reversing of the main oil cylinder, and concrete in the distributing pipe, the concrete cylinder and the S valve is cleaned out. The emergency control module is essentially characterized in that a hydraulic control reversing function is added on the basis of the original electric proportional control, an oil way is switched by operating a manual reversing valve, and a variable mechanism of a main oil pump is directly controlled in a hydraulic control mode to complete the reversing of the main oil pump. The control mode of the original main oil pump is properly modified, and a transition hydraulic control valve for emergency control is added outside a variable mechanism of the main oil pump and serves as a carrier for receiving hydraulic control signals, so that the reversing of the main oil pump is realized. The external control valve can be manual or electric controlled, and the emergency control of the pumping hydraulic system is realized. Because the device is the hydraulic means of main oil pump outside, emergent convenient operation can also carry out remote control, has improved the reliability of pump sending hydraulic system.
Drawings
Fig. 1 is a schematic diagram of oil circuit control of the overall structure of the present invention.
In the figure: 1. a hydraulic oil tank; 2. a first main oil cylinder; 3. a second main oil cylinder; 4. a variable displacement pump; 5. a variable cylinder; 6. a safety oil supply valve; 7. a first overflow valve; 8. a hot oil shuttle valve; 9. an overflow valve II; 10. a hydraulic control valve; 11. a manual control valve; I. a first main oil way; II. A main oil way II; III, a main oil way III.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments.
In the description of the present invention, it is to be understood that the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", and the like, indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, are merely for convenience in describing the present invention and simplifying the description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention.
Examples
As shown in fig. 1, an emergency control device for an electric proportional pump comprises a main oil pump system, a hydraulic oil tank 1, a first main oil cylinder 2 and a second main oil cylinder 3 connected with the first main oil cylinder 2, wherein the main oil pump system comprises a variable pump 4, a variable cylinder 5, a safety oil supplementing valve 6, a first overflow valve 7, a hot oil shuttle valve 8 (a three-position one-way reversing valve), a second overflow valve 9 and an emergency control module;
the oil ports of the left cavity and the right cavity of the variable cylinder 5 are respectively connected with corresponding oil ports on a proportional valve in an emergency control module through oil paths, one oil port of the proportional valve in the emergency control module is connected with a hydraulic oil tank 1 through an oil path, the other oil port of the proportional valve is connected with two safety oil replenishing valves 6 through a main oil path III, the two safety oil replenishing valves 6 are arranged in parallel, the oil port of one safety oil replenishing valve 6 is connected with a main oil path I, the oil port of the other safety oil replenishing valve 6 is connected with a main oil path II, the main oil path III is connected with an oil inlet of an overflow valve I7, and the oil port of the overflow valve I7 is connected with the hydraulic oil tank 1 through an oil path;
the emergency control module comprises a transition hydraulic valve 10 and a manual reversing valve 11, the transition hydraulic valve 10 comprises a proportional valve and a transition valve body, the transition valve body with an oil channel inside is additionally arranged on two electromagnets of the proportional valve, the oil channel inside the transition valve body is connected with an oil port corresponding to the proportional valve respectively, the oil channel inside the transition valve body is connected with an oil port corresponding to the manual reversing valve 11 respectively, an oil inlet of the manual reversing valve 11 is connected with the main oil channel III, and when the electromagnets of the proportional valve are damaged, the reversing of the main oil pump system is controlled through the manual reversing valve 11.
The variable pump 4 is connected with the first main oil cylinder 2 through a first main oil way I and is connected with the second main oil cylinder 3 through a second main oil way II, the first main oil way I and the second main oil way II are connected with corresponding oil ports on the hot oil shuttle valve 8 together, an oil outlet of the hot oil shuttle valve 8 is connected with an oil inlet of a second overflow valve 9, and an oil outlet of the second overflow valve 9 is connected with the hydraulic oil tank 1.
The action process is as follows:
when the variable pump 4 supplies oil to the top (the port B is high in pressure and the port A is low in pressure), pressure oil output by the variable pump 4 enters a left cavity of a primary oil cylinder I2 through a primary oil way I and pushes a piston of the primary oil cylinder I2 to extrude to the right cavity, pressure oil in the right cavity of the primary oil cylinder I2 flows to pressure oil in the right cavity of a primary oil cylinder II 3, the piston of the primary oil cylinder II 3 is extruded to the left cavity, and pressure oil in the left cavity returns to the inside of the variable pump 4 through a primary oil way II; after the variable pump 4 is reversed, when the variable pump 4 supplies oil to the bottom (the port A is high in pressure and the port B is low in pressure), pressure oil output by the variable pump 4 enters a left cavity of the main oil cylinder II 3 through the main oil way II and pushes a piston of the main oil cylinder II 3 to extrude towards the right cavity, pressure oil in the right cavity of the main oil cylinder II 3 flows to pressure oil in the right cavity of the main oil cylinder I2, the piston of the main oil cylinder I2 is extruded towards the left cavity, and the pressure oil in the left cavity returns to the inside of the variable pump 4 through the main oil way I; the reversing action is realized by changing the angle of a swash plate inside the variable displacement pump from a positive angle to a negative angle. The safety oil supplementing valve 6 has two functions, when the pressure of the port A (high-pressure side) exceeds the set value of the safety oil supplementing valve 6, the safety oil supplementing valve 6 is opened, and oil returns to the port B (low-pressure side) through a one-way valve in the other safety oil supplementing valve 6; the hot oil shuttle valve 8 is only circulated between the variable displacement pump 4 and the oil cylinder because oil liquid, and a hydraulic system is easy to heat, so the hot oil shuttle valve 8 is arranged to replace oil liquid on the low-pressure side in the system for cooling, and the specific action process is as follows: when the pressure of the port B is high, the valve core of the hot oil shuttle valve 8 is switched to an upper state, at the moment, the low-pressure side (the low pressure of the port A) flows back to an oil tank through the hot oil shuttle valve 8 through the overflow valve II 9 for heat dissipation and cooling, the oil volume in the system is reduced due to leakage in the variable displacement pump 4 and replacement of hot oil in the system by the hot oil shuttle valve 8, so that oil needs to be supplemented to the system, the oil supplement is realized through a one-way valve in the hot oil shuttle valve 6, and the supplemented oil comes from pressure oil (an oil way III) of an oil supplement pump. The oil inlet of the manual reversing valve 11 is taken from the oil outlet circuit III (Ps) of the oil replenishing pump, when the electromagnet of the proportional valve fails, the manual reversing valve 11 is manually controlled to be in a left position state, the switching proportional valve is in the left position state, pressure oil enters a left cavity of the variable cylinder 5 and pushes a piston of the variable cylinder 5 to move rightwards, so that the pressure oil in a right cavity enters the hydraulic oil tank 1, and the variable pump 4 has displacement after the piston of the variable cylinder 5 moves, so that the emergency working condition is realized; when the manual control manual reversing valve 11 is in a right position state, the switching proportional valve is in a right position state, pressure oil enters a right cavity of the variable cylinder 5, a piston of the variable cylinder 5 is pushed to move leftwards, so that the pressure oil in a left cavity enters the hydraulic oil tank 1, the variable pump 4 has displacement reversing after the piston of the variable cylinder 5 moves, and reversing under an emergency working condition is finally realized; from the process, the manual reversing valve 11 is used for controlling the proportional valve to switch and reverse when the electromagnet of the proportional valve fails or the electric control system fails, so that the reversing of the variable displacement pump 4 is realized, the alternative action of the main oil cylinder is further completed, the concrete in the concrete cylinder is discharged, and the emergency working condition is finally realized. The emergency control system is a backup or redundant design, and both the emergency control system and the electrical control system are intended to control the proportional valve.
Example 2:
the oil inlet of the manual reversing valve 11 is taken from the oil outlet circuit III (Ps) of the oil replenishing pump, when the electromagnet of the proportional valve fails, the manual reversing valve 11 is manually controlled to be in a left position state, the switching proportional valve is in the left position state, pressure oil enters a left cavity of the variable cylinder 5 and pushes a piston of the variable cylinder 5 to move rightwards, so that the pressure oil in a right cavity enters the hydraulic oil tank 1, and the variable pump 4 has displacement after the piston of the variable cylinder 5 moves, so that the emergency working condition is realized; when the manual control manual reversing valve 11 is in a right position state, the switching proportional valve is in a right position state, pressure oil enters a right cavity of the variable cylinder 5, a piston of the variable cylinder 5 is pushed to move leftwards, so that the pressure oil in a left cavity enters the hydraulic oil tank 1, the variable pump 4 has displacement reversing after the piston of the variable cylinder 5 moves, and reversing under an emergency working condition is finally realized; from the process, the manual reversing valve 11 is used for controlling the proportional valve to switch and reverse when the electromagnet of the proportional valve fails or the electric control system fails, so that the reversing of the variable displacement pump 4 is realized, the alternative action of the main oil cylinder is further completed, the concrete in the concrete cylinder is discharged, and the emergency working condition is finally realized.
The electric proportional pump emergency control device is applied to concrete pump truck products produced by the company, the using effect achieves the purpose of the invention, the hydraulic system works stably and reliably, the customer response is good, the emergency operation is convenient, remote control can be performed, and the reliability of the pumping hydraulic system is improved.
The above description is only a preferred embodiment of the present invention, but the scope of the present invention is not limited thereto. The substitution may be of partial structures, devices, method steps, or may be a complete solution. The technical solution and the inventive concept thereof according to the present invention should be equally replaced or changed within the protection scope of the present invention.
Claims (7)
1. The utility model provides an electric proportional pump emergency control device, includes main oil pump system, hydraulic tank (1), master cylinder (2), the master cylinder two (3) that link to each other with master cylinder (2), its characterized in that:
the main oil pump system comprises a variable pump (4), a variable cylinder (5), a safe oil supplementing valve (6), a first overflow valve (7), a reversing valve (8), a second overflow valve (9) and an emergency control module;
two cavities of oil ports of the variable cylinder (5) are connected with an emergency control module, the emergency control module is connected with a hydraulic oil tank (1) through an oil way and is connected with two safety oil supplementing valves (6) through a main oil way III, the two safety oil supplementing valves (6) are arranged in parallel, one safety oil supplementing valve (6) is connected with a main oil way I, the other safety oil supplementing valve is connected with a main oil way II, and the main oil way III (III) is connected with an overflow valve I (7);
the variable pump (4) is connected with the first main oil cylinder (2) through a first main oil way (I) and connected with the second main oil cylinder (3) through a second main oil way (II), the first main oil way (I) and the second main oil way (II) are jointly connected with a reversing valve (8), the reversing valve (8) is connected with a second overflow valve (9), and the second overflow valve (9) is connected with the hydraulic oil tank (1).
2. The emergency control device for the electric proportional pump according to claim 1, wherein: the emergency control module comprises a transition hydraulic valve (10) and a manual reversing valve (11), the transition hydraulic valve (10) comprises a proportional valve and a transition valve body, two transition valve bodies with oil passages inside are additionally arranged on two electromagnets of the proportional valve, the oil passages inside the transition valve bodies are respectively connected with oil ports corresponding to the proportional valve, the transition valve bodies are connected with the manual reversing valve (11), the oil ports corresponding to the manual reversing valve (11) are connected with three (III) of a main oil passage, and when the electromagnets of the proportional valve are damaged, reversing of the main oil pump system is controlled through the manual reversing valve (11).
3. The emergency control device for the electric proportional pump according to claim 2, wherein: the manual reversing valve (11) is a three-position four-way manual reversing valve.
4. The emergency control device for the electric proportional pump according to claim 2, wherein: the proportional valve is a three-position four-way electromagnetic proportional valve.
5. The emergency control device for the electric proportional pump according to claim 1, wherein: the hot oil shuttle valve (8) is a three-position one-way reversing valve.
6. The method for controlling the emergency control device of the electric proportional pump according to any one of claims 1 to 5, comprising the steps of:
the oil inlet of the manual reversing valve (11) is taken from an oil way III at the outlet of the oil replenishing pump, when the electromagnet of the proportional valve fails, the manual reversing valve (11) is manually controlled to be in a left position state, the switching proportional valve is in the left position state, pressure oil enters a left cavity of the variable cylinder (5), the piston of the variable cylinder (5) is pushed to move rightwards, so that the pressure oil in a right cavity enters the hydraulic oil tank (1), and the variable pump (4) has displacement after the piston of the variable cylinder (5) moves, so that an emergency working condition is realized; when the manual control manual reversing valve (11) is in a right position state, the switching proportional valve is in a right position state, pressure oil enters a right cavity of the variable cylinder (5) to push a piston of the variable cylinder (5) to move leftwards, so that the pressure oil in a left cavity enters the hydraulic oil tank (1), the variable pump (4) has displacement to perform reversing after the piston of the variable cylinder (5) moves, and finally the reversing under the emergency working condition is realized.
7. A concrete pump truck comprising an electric proportional pump emergency control device according to any one of claims 1 to 5.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011537866.8A CN112539204A (en) | 2020-12-23 | 2020-12-23 | Electric proportional pump emergency control device and concrete pump truck |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011537866.8A CN112539204A (en) | 2020-12-23 | 2020-12-23 | Electric proportional pump emergency control device and concrete pump truck |
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| Publication Number | Publication Date |
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| CN112539204A true CN112539204A (en) | 2021-03-23 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202011537866.8A Pending CN112539204A (en) | 2020-12-23 | 2020-12-23 | Electric proportional pump emergency control device and concrete pump truck |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114635885A (en) * | 2022-05-18 | 2022-06-17 | 徐工集团工程机械股份有限公司建设机械分公司 | Oil cylinder driven closed type traveling system and working method thereof |
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| CN203214291U (en) * | 2013-03-25 | 2013-09-25 | 华菱星马汽车（集团）股份有限公司 | Concrete pump truck and automatic reverse pump device thereof |
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| CN104019076A (en) * | 2014-05-27 | 2014-09-03 | 安徽星马专用汽车有限公司 | Main oil pump reversing system of closed system pump truck and closed system pump truck |
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| US20180319634A1 (en) * | 2014-10-30 | 2018-11-08 | Xuzhou Heavy Machinery Co., Ltd. | Crane hydraulic system and controlling method of the system |
| CN112096671A (en) * | 2020-09-30 | 2020-12-18 | 潍柴动力股份有限公司 | Variable pump and hydraulic system |
| CN215257041U (en) * | 2020-12-23 | 2021-12-21 | 安徽星马专用汽车有限公司 | Electric proportional pump emergency control device and concrete pump truck |
-
2020
- 2020-12-23 CN CN202011537866.8A patent/CN112539204A/en active Pending
Patent Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH05106563A (en) * | 1991-05-20 | 1993-04-27 | Kawasaki Heavy Ind Ltd | Hydraulic control device for variable displacement type oil hydraulic pump |
| CN203214291U (en) * | 2013-03-25 | 2013-09-25 | 华菱星马汽车（集团）股份有限公司 | Concrete pump truck and automatic reverse pump device thereof |
| CN103434649A (en) * | 2013-07-22 | 2013-12-11 | 燕山大学 | Deceleration and return air hydraulic control system of unmanned aerial vehicle (UAV) ejection device |
| CN104019076A (en) * | 2014-05-27 | 2014-09-03 | 安徽星马专用汽车有限公司 | Main oil pump reversing system of closed system pump truck and closed system pump truck |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114635885A (en) * | 2022-05-18 | 2022-06-17 | 徐工集团工程机械股份有限公司建设机械分公司 | Oil cylinder driven closed type traveling system and working method thereof |
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