CN113915188B - Self-adaptive hydraulic control system - Google Patents
Self-adaptive hydraulic control system Download PDFInfo
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- CN113915188B CN113915188B CN202111207970.5A CN202111207970A CN113915188B CN 113915188 B CN113915188 B CN 113915188B CN 202111207970 A CN202111207970 A CN 202111207970A CN 113915188 B CN113915188 B CN 113915188B
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- 230000002596 correlated effect Effects 0.000 claims abstract description 5
- 230000003044 adaptive effect Effects 0.000 claims description 13
- 239000007788 liquid Substances 0.000 claims description 10
- 230000001105 regulatory effect Effects 0.000 claims description 10
- 239000012530 fluid Substances 0.000 claims description 4
- 239000003921 oil Substances 0.000 description 121
- 239000000463 material Substances 0.000 description 7
- 230000033001 locomotion Effects 0.000 description 4
- 238000000034 method Methods 0.000 description 3
- 238000010521 absorption reaction Methods 0.000 description 1
- 230000001276 controlling 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
- 239000000284 extract Substances 0.000 description 1
- 239000010720 hydraulic oil Substances 0.000 description 1
- 230000010354 integration Effects 0.000 description 1
- 238000004080 punching Methods 0.000 description 1
Classifications
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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
- F15B13/00—Details of servomotor systems ; Valves for servomotor systems
- F15B13/02—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors
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- 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
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- Engineering & Computer Science (AREA)
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- 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 a self-adaptive hydraulic control system, which relates to the field of hydraulic control systems and comprises a first oil way, a second oil way and a load feedback valve, wherein the first oil way is provided with a first load port, the second oil way is provided with a second load port, the first load port is used for being connected with a rod cavity of a load cylinder body, the second load port is used for being connected with a rodless cavity of the load cylinder body, the first load port is communicated with the load feedback valve, and the oil pressure of the first load port is used for adjusting the opening degree of the load feedback valve so as to adjust the oil pressure of the second oil way flowing into the second load port and enable the oil pressure of the second oil way flowing into the second load port to be positively correlated with the oil pressure of the first load port flowing into the load feedback valve. The self-adaptive hydraulic control system can enable the feeding of the hydraulic system to be more stable.
Description
Technical Field
The invention relates to the field of hydraulic control systems, in particular to a self-adaptive hydraulic control system.
Background
With the gradual popularization of equipment such as a domestic hydraulic inching feeding control device, higher requirements are put forward on inching self-adaptive control of a hydraulic system. Particularly, quick feeding and accurate positioning are required in full-automatic high-speed punching equipment, and the hydraulic equipment for micro feeding is automatically adapted according to the weight of a material stack, so that the self-adaptive control mode is always stable in the first place, the hydraulic dynamic response during high-frequency micro feeding can be overcome, and the problems of stable control and control precision of the micro lifting of the plate under different weights are solved. The control system has the advantages of strong pollution resistance, simple control, self-adaptive adjustment of hydraulic internal pressure feedback, high integration degree and the like. However, the existing multistage micro-speed valve hydraulic system always has the defects of unstable control precision and high failure rate, and once the problem of the hydraulic system occurs, the situation of incapability of feeding or multiple feeding is caused, the stable use of similar working conditions cannot be met, and the problem that the stable control precision of equipment becomes a technical problem to be overcome once in the industry is solved. Therefore, the use of the self-adaptive hydraulic control system solves the problem of stable control of the feeding device under various working conditions. The self-adaptive function in the self-adaptive hydraulic control system is to realize the self-adaptive adjusting function through internal hydraulic pressure feedback under different material pile weights, so as to prevent the material pile weights from influencing the feeding device. In the conventional micro-motion self-adaptive hydraulic system of the feeding device in actual use, self-adaptive control through internal hydraulic pressure feedback cannot be achieved, and the condition of multiple feeding in the feeding process also exists, so that faults of host equipment frequently occur, and hidden quality hazards in the using process cannot be avoided.
Disclosure of Invention
The invention aims to provide a self-adaptive hydraulic control system which solves the problems in the prior art and can enable the feeding of a hydraulic system to be more stable.
In order to achieve the above object, the present invention provides the following solutions:
The invention provides a self-adaptive hydraulic control system which comprises a first oil way, a second oil way and a load feedback valve, wherein the first oil way is provided with a first load port, the second oil way is provided with a second load port, the first load port is used for being connected with a rod cavity of a load cylinder body, the second load port is used for being connected with a rodless cavity of the load cylinder body, the first load port is communicated with the load feedback valve, and the oil pressure of the first load port is used for adjusting the opening degree of the load feedback valve so as to adjust the oil pressure of the second oil way flowing into the second load port and enable the oil pressure of the second oil way flowing into the second load port to be positively correlated with the oil pressure of the first load port flowing into the load feedback valve.
Preferably, the hydraulic oil pump further comprises a reversing valve, the first oil way is provided with a first reversing valve connecting port, the second oil way is provided with a second reversing valve connecting port, the reversing valve is respectively communicated with the first reversing valve connecting port and the second reversing valve connecting port, and the reversing valve can be used for reversing the oil flow directions in the first oil way and the second oil way.
Preferably, the hydraulic control system further comprises a hydraulic resistance regulating valve, wherein the hydraulic resistance regulating valve is arranged in series between the first load port and the first reversing valve connecting port in the first oil way.
Preferably, the reversing valve comprises a first valve port for communicating with an oil source, a second valve port for communicating with an oil return tank, a third valve port for communicating with a connecting port of the first reversing valve and a fourth valve port for communicating with a load feedback valve, and the reversing valve can adjust the communication relation between the first valve port and the second valve port and the third valve port and the fourth valve port so as to adjust the flow direction of oil in the first oil path and the second oil path.
Preferably, the load feedback valve comprises a load feedback valve body, a first valve port communicated with the fourth valve port, a second valve port communicated with the second load port and a third valve port communicated with the first load port, a valve core slideway is arranged in the load feedback valve body, the valve core slideway is communicated with the first valve port and the third valve port, a load feedback valve core is slidably arranged in the valve core slideway, oil liquid in the first load port enters the load feedback valve through the third valve port, and the load feedback valve core in the load feedback valve is controlled to slide through oil pressure so as to control the oil flow of the first valve port flowing into the second valve port.
Preferably, the load feedback valve further comprises a control cavity, one end of the load feedback valve core is connected with a piston, the piston is arranged in the control cavity in a sliding mode, the control cavity is divided into a first cavity and a second cavity by the piston, the first cavity is communicated with the valve port III, the second cavity is provided with an oil fluid communication port, and the piston moves in the control cavity to drive the load feedback valve core to move so as to adjust the oil fluid flow of the valve port I flowing into the valve port II.
Preferably, the load feedback valve further comprises a valve port IV communicated with the oil return tank, the valve core slideway is communicated with the valve port II and the valve port IV, the load feedback valve core slides in the valve core slideway and can control the flow rate of the valve port II flowing into the valve port IV so as to discharge excessive oil from the valve port I flowing into the valve port II from the valve port IV, and the load feedback valve core moves to enable the flow rate of the valve port II flowing into the valve port IV and the flow rate of the valve port I flowing into the valve port II simultaneously.
Preferably, the load feedback valve core comprises a valve core block and a return spring, the end part of the return spring is fixedly connected with the valve core block and the load feedback valve body respectively, and the return spring is used for pushing the valve core block to return when the oil pressure of the first load port is reduced.
Preferably, the oil liquid communication port is used for being communicated with the oil return tank.
Preferably, the reversing valve is an electromagnetic direct-drive type high-performance reversing valve.
Preferably, the reversing valve is an electromagnetic direct-drive type high-performance reversing valve.
Compared with the prior art, the invention has the following technical effects:
According to the self-adaptive hydraulic control system provided by the invention, the first load port is used for being connected with the rod cavity of the load cylinder body, the second load port is used for being connected with the rodless cavity of the load cylinder body, the first load port is communicated with the load feedback valve, the oil pressure of the first load port is used for adjusting the opening degree of the load feedback valve so as to adjust the oil pressure of the second oil way flowing into the second load port, and the oil pressure of the second oil way flowing into the second load port is positively correlated with the oil pressure of the first load port flowing into the load feedback valve. The oil pressure of the first load port can adjust the oil flow input to the second load port by the load feedback valve so as to adjust the feeding speed, and when the weight of the material is large, the pressure of the first load port is small, so that the oil flow input to the second load port by the load feedback valve is small, and the feeding speed is reduced; when the materials are few and the weight is light, the pressure of the first load port is high, so that the oil flow of the second load port input by the load feedback valve is regulated, the feeding speed is increased, the purpose of uniform feeding is achieved, the self-adaptive regulation of the oil pressure of the second load port is realized, and the feeding of the hydraulic system is more stable.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings that are needed in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
Fig. 1 is a schematic structural diagram of an adaptive hydraulic control system provided in the present invention.
In the figure: 1-an adaptive hydraulic control system; 2-a liquid resistance regulating valve; 3-reversing valve; 4-an oil source; 5-returning the oil tank; 6, an oil discharge port; 7-a load feedback valve; 8-a second load port; 9-a first load port; 10-a third valve port; 11-a first valve port; 12-a second valve port; 13-fourth valve port; 14-valve port I; 15-valve port IV; 16-an oil liquid communication port and 17-a valve port III; 18-valve port two.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
The invention aims to provide a self-adaptive hydraulic control system which solves the problems in the prior art and can enable the feeding of a hydraulic system to be more stable.
In order that the above-recited objects, features and advantages of the present invention will become more readily apparent, a more particular description of the invention will be rendered by reference to the appended drawings and appended detailed description.
The present embodiment provides an adaptive hydraulic control system 1, as shown in fig. 1, including a first oil path, a second oil path and a load feedback valve 7, where the first oil path has a first load port 9, the second oil path has a second load port 8, the first load port 9 is used for connecting a rod cavity of a load cylinder, the second load port 8 is used for connecting a rodless cavity of the load cylinder, the first load port 9 is communicated with the load feedback valve 7, and the oil pressure of the first load port 9 is used for adjusting the opening degree of the load feedback valve 7 to adjust the flow rate of the second oil path flowing into the second load port 8 and make the oil pressure of the second oil path flowing into the second load port 8 positively correlated with the oil pressure of the first load port 9 flowing into the first load port 9. The oil pressure of the first load port 9 can adjust the oil flow input by the load feedback valve 7 to the second load port 8 so as to adjust the feeding speed, and when the weight of the material is large, the pressure of the first load port 9 is small, so that the oil flow input by the load feedback valve 7 to the second load port 8 is small, and the feeding speed is reduced; when the materials are few and the weight is light, the pressure of the first load port 9 is high, so that the oil flow of the second load port 8 input by the load feedback valve 7 is regulated, the feeding speed is increased, the purpose of uniform feeding is achieved, the self-adaptive regulation of the oil pressure of the second load port 8 is realized, and the feeding of the hydraulic system is more stable.
In this embodiment, the reversing valve further includes a reversing valve 3, the first oil circuit has a first reversing valve connector, the second oil circuit has a second reversing valve connector, the reversing valve 3 is respectively communicated with the first reversing valve connector and the second reversing valve connector, and the reversing valve 3 can reverse the oil flow direction in the first oil circuit and the second oil circuit. The reversing valve 3 reverses the flow direction of the oil in the first oil path and the second oil path, so that the reciprocating motion of the piston rod in the load cylinder body can be realized, and the feeding can be repeated.
In this embodiment, the hydraulic resistance adjusting valve 2 is further included, and the hydraulic resistance adjusting valve 2 is disposed in series between the first load port 9 and the first reversing valve connection port in the first oil path. The hydraulic resistance adjusting valve 2 can adjust the pressure of the first load port 9 by adjusting the flow rate of the oil in the first oil path, so that the first load port 9 can have a basic pressure fed back to the load feedback valve 7, and the load feedback valve 7 can provide the minimum oil flow rate for the second load port 8. The range of use of the adaptive hydraulic control system 1 is increased.
In this embodiment, the reversing valve 3 includes a first port 11 communicating with the oil source 4, a second port 12 communicating with the oil return tank 5, a third port 10 communicating with the first reversing valve connection port, and a fourth port 13 communicating with the load feedback valve 7, and the reversing valve 3 can adjust the communication relationship between the first port 11 and the second port 12 and the third port 10 and the fourth port 13 to adjust the flow direction of the oil in the first oil path and the second oil path. Thereby realizing reversing the oil flow direction in the first oil way and the second oil way.
In this embodiment, the first valve port 11 is a P port of the reversing valve 3, the second valve port 12 is a T port of the reversing valve 3, the third valve port 10 is an a port of the reversing valve 3, and the fourth valve port 13 is a B port of the reversing valve 3.
In this embodiment, the load feedback valve 7 includes a load feedback valve body, a first valve port 14 communicated with a fourth valve port 13, a second valve port 18 communicated with a second load port 8, and a third valve port 17 communicated with a first load port 9, a valve core slideway is arranged in the load feedback valve body, the valve core slideway is communicated with the first valve port 14 and the third valve port 17, the load feedback valve core is slidably arranged in the valve core slideway, the oil in the first load port 9 enters the load feedback valve 7 through the third valve port 17, and the oil pressure controls the load feedback valve core in the load feedback valve 7 to slidably control the oil flow of the first valve port 14 flowing into the second valve port 18. Thereby realizing the self-adaptive adjustment of the oil pressure of the second load port 8 according to the oil pressure of the first load port 9.
In this embodiment, the first port 14 is a P port of the load feedback valve 7, the fourth port 15 is a T port of the load feedback valve 7, the second port 18 is an a port of the load feedback valve 7, the third port 17 is an X port of the load feedback valve 7, and the oil communication port 16 is a Y port of the load feedback valve 7.
In this embodiment, the load feedback valve 7 further includes a control chamber, one end of the load feedback valve core is provided with a piston, the piston is slidably disposed in the control chamber, the piston divides the control chamber into a first cavity and a second cavity, the first cavity is communicated with the third valve port 17, the second cavity has an oil communication port 16, the piston moves in the control chamber, and the movement drives the load feedback valve core to move, so as to adjust the oil flow of the first valve port 14 flowing into the second valve port 18, and also enable the second cavity to absorb oil or discharge oil. The oil absorption or drainage of the second cavity can provide a buffer for the movement of the load feedback spool.
In this embodiment, the load feedback valve further includes a fourth valve port 15 that is communicated with the oil return tank, the valve core slide way is communicated with the second valve port 18 and the fourth valve port 15, and the load feedback valve core can control the flow rate of the second valve port 18 flowing into the fourth valve port 15 in the sliding of the valve core slide way, so as to discharge the excessive oil entering the second valve port 18 from the first valve port 14 from the fourth valve port 15, realize unloading, further regulate the flow rate of the oil flowing into the second load port 8, and make the feeding of the adaptive hydraulic control system 1 more stable. And the load feedback valve core moves to enable the flow of the second valve port 18 flowing into the fourth valve port 15 and the flow of the first valve port 14 flowing into the second valve port 18 at the same time so as to adjust the oil pressure of the second valve port 18 entering the second load port. The load feedback valve core can increase the flow of the first port 14 into the second port 18 and simultaneously reduce the flow of the second port 18 into the fourth port 15, or reduce the flow of the first port 14 into the second port 18 and simultaneously increase the flow of the second port 18 into the fourth port 15, so as to further adjust the oil pressure of the second port 18 into the second load port.
In this embodiment, the load feedback valve core includes a valve core block and a return spring, the end of the return spring is fixedly connected with the valve core block and the load feedback valve body respectively, and the return spring is used for pushing to reset the valve core block when the oil pressure of the first load port 9 is reduced.
In this embodiment, the oil communication port 16 is used for communicating with the oil return tank 5, so that the oil discharged from the second cavity can return to the oil return tank 5, and the oil can be extracted from the oil return tank 5, the oil communication port 16 is communicated with the oil return tank 5 through the oil discharge port 6, and the oil communication port 16 extracts the oil from the oil return tank 5 through the oil discharge port 6.
In this embodiment, the reversing valve 3 is preferably an electromagnetic direct-drive type high-performance reversing valve.
In this embodiment, during feeding, the oil source 4 is connected to the P port of the electromagnetic direct-drive high-performance reversing valve, and when the electromagnetic direct-drive high-performance reversing valve is powered on to work at the a end, the P port is communicated with the B port, and the B port is connected with the P port of the load feedback valve 7. The X port of the load feedback valve 7 is connected with the first load port 9, the pressure feedback value of the first load port 9 acts on the right side hydraulic control port of the load feedback valve 7, oil discharged by controlling the movement of the piston flows back to the oil drain port through the Y port, thus the opening stroke opening of the load feedback valve core of the load feedback valve 7 can be controlled, the output flow of the A port of the load feedback valve 7 is controlled by the pressure of the first load port 9, the self-adaptive adjustment of the output flow of the second load port 8 of the feeding device under the action of different stack weights is realized, and the micro-motion feeding action is stably controlled. Because the stroke of the load feedback valve core of the load feedback valve 7 is controlled, the flow which is introduced through the electromagnetic direct-drive high-performance reversing valve cannot flow out of the port A of the load feedback valve 7 completely, and the redundant oil flows back to the oil return tank 5 through the port T of the load feedback valve 7. The oil pressure of the first load port 9 is fed back to the X port of the load feedback valve 7, the flow flows to the A port of the electromagnetic direct-drive high-performance reversing valve from the a port to the b port of the hydraulic resistance regulating valve 2, and at the moment, the hydraulic resistance regulating valve 2 can regulate according to the total amount of the oil flowing out of the matched feeding device actuator, so that the pressure fed back to the X port of the load feedback valve 7 is proportionally adapted. During return stroke, the opening A of the electromagnetic direct-drive high-performance reversing valve is communicated with the opening T, and the electromagnetic direct-drive high-performance reversing valve flows to the oil return tank 4 from the opening T. When the electromagnetic direct-drive high-performance reversing valve works at the electrified end b, the port P of the electromagnetic direct-drive high-performance reversing valve is communicated with the port A, the port A of the electromagnetic direct-drive high-performance reversing valve is connected with the port B to the port a of the liquid resistance regulating valve 2, the electromagnetic direct-drive high-performance reversing valve enters the first load port 9 and applies a high pressure feedback value to the load feedback valve 7, the load feedback valve core moves to enable oil liquid discharged by the second cavity to flow out through the port Y of the load feedback valve 7, the port P of the load feedback valve 7 is communicated with the port A, the port T and the port A, and oil liquid of the second load port 8 enters the port T and the port P through the port A of the load feedback valve 7 and flows to the oil return tank 5.
The principles and embodiments of the present invention have been described in detail with reference to specific examples, which are provided to facilitate understanding of the method and core ideas of the present invention; also, it is within the scope of the present invention to be modified by those of ordinary skill in the art in light of the present teachings. In view of the foregoing, this description should not be construed as limiting the invention.
Claims (8)
1. An adaptive hydraulic control system, characterized by: the hydraulic control system comprises a first oil way, a second oil way and a load feedback valve, wherein the first oil way is provided with a first load port, the second oil way is provided with a second load port, the first load port is used for being connected with a rod cavity of a load cylinder body, the second load port is used for being connected with a rodless cavity of the load cylinder body, the first load port is communicated with the load feedback valve, and the oil pressure of the first load port is used for adjusting the opening degree of the load feedback valve so as to adjust the oil pressure of the second oil way flowing into the second load port and enable the oil pressure of the second oil way flowing into the second load port to be positively correlated with the oil pressure of the first load port flowing into the load feedback valve; the reversing valve is communicated with the first reversing valve connecting port and the second reversing valve connecting port respectively, and can be used for reversing the flow direction of oil in the first oil way and the second oil way; the hydraulic control system further comprises a hydraulic resistance regulating valve, wherein the hydraulic resistance regulating valve is arranged in series between the first load port and the first reversing valve connecting port in the first oil way.
2. The adaptive hydraulic control system of claim 1, wherein: the reversing valve comprises a first valve port, a second valve port, a third valve port and a fourth valve port, wherein the first valve port is communicated with an oil source, the second valve port is communicated with an oil return tank, the third valve port is communicated with a first reversing valve connector, the fourth valve port is communicated with a load feedback valve, and the reversing valve can adjust the communication relation between the first valve port and the second valve port and the third valve port and the fourth valve port so as to adjust the flow direction of oil in the first oil way and the second oil way.
3. The adaptive hydraulic control system of claim 2, wherein: the load feedback valve comprises a load feedback valve body, a first valve port communicated with the fourth valve port, a second valve port communicated with the second load port and a third valve port communicated with the first load port, a valve core slide way is arranged in the load feedback valve body, the valve core slide way is communicated with the first valve port and the third valve port, a load feedback valve core is slidably arranged in the valve core slide way, oil liquid in the first load port enters the load feedback valve through the third valve port, and the load feedback valve core in the load feedback valve is controlled to slide through oil pressure so as to control the oil flow of the first valve port flowing into the second valve port.
4. The adaptive hydraulic control system of claim 3, wherein: the load feedback valve further comprises a control cavity, one end of the load feedback valve core is connected with a piston, the piston is arranged in the control cavity in a sliding mode, the control cavity is divided into a first cavity and a second cavity by the piston, the first cavity is communicated with the valve port III, the second cavity is provided with an oil fluid communication port, and the piston moves in the control cavity to drive the load feedback valve core to move so as to adjust the oil fluid flow of the valve port I flowing into the valve port II.
5. The adaptive hydraulic control system of claim 4, wherein: the load feedback valve further comprises a valve port IV communicated with the oil return box, the valve core slideway is communicated with the valve port II and the valve port IV, the load feedback valve core can control the flow rate of the valve port II flowing into the valve port IV in a sliding manner in the valve core slideway so as to discharge excessive oil liquid entering into the valve port II from the valve port I from the valve port IV, and the load feedback valve core can move to enable the flow rate of the valve port II flowing into the valve port IV and the flow rate of the valve port I flowing into the valve port II simultaneously.
6. The adaptive hydraulic control system of claim 5, wherein: the load feedback valve core comprises a valve core block and a return spring, the end part of the return spring is fixedly connected with the valve core block and the load feedback valve body respectively, and the return spring is used for pushing the valve core block to return when the oil pressure of the first load port is reduced.
7. The adaptive hydraulic control system of claim 4, wherein: the oil liquid communication port is used for being communicated with the oil return tank.
8. The adaptive hydraulic control system of claim 1, wherein: the reversing valve is an electromagnetic direct-drive type high-performance reversing valve.
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| CN202111207970.5A CN113915188B (en) | 2021-10-18 | 2021-10-18 | Self-adaptive hydraulic control system |
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| CN202111207970.5A CN113915188B (en) | 2021-10-18 | 2021-10-18 | Self-adaptive hydraulic control system |
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| CN206958007U (en) * | 2017-03-29 | 2018-02-02 | 淄博黄河龙生物工程有限公司 | Accumulation of energy filter |
| WO2020006932A1 (en) * | 2018-07-03 | 2020-01-09 | 徐州海伦哲专用车辆股份有限公司 | Bucket leveling system for aerial work truck |
| CN109989951A (en) * | 2019-03-28 | 2019-07-09 | 贵州大学 | A kind of varying load job platform decrease speed control device and method |
| CN111878475A (en) * | 2020-07-29 | 2020-11-03 | 锦州力特液压科技有限公司 | Load-sensitive multi-way valve bank |
| CN112555213A (en) * | 2020-11-20 | 2021-03-26 | 常德中联重科液压有限公司 | Hydraulic control loop, valve group unit and engineering machinery |
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