CN110594228B - Automatic vibration table hydraulic system that buffering was switched - Google Patents
Automatic vibration table hydraulic system that buffering was switched Download PDFInfo
- Publication number
- CN110594228B CN110594228B CN201910951919.1A CN201910951919A CN110594228B CN 110594228 B CN110594228 B CN 110594228B CN 201910951919 A CN201910951919 A CN 201910951919A CN 110594228 B CN110594228 B CN 110594228B
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- Prior art keywords
- valve
- port
- hydraulic
- way cartridge
- cartridge valve
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- 230000003139 buffering effect Effects 0.000 title claims abstract description 13
- 230000004044 response Effects 0.000 claims abstract description 39
- 238000013016 damping Methods 0.000 claims abstract description 24
- 239000003921 oil Substances 0.000 claims description 27
- 239000010729 system oil Substances 0.000 claims description 8
- 102000046255 Type III Sodium-Phosphate Cotransporter Proteins Human genes 0.000 claims description 3
- 108091006286 Type III sodium-phosphate co-transporters Proteins 0.000 claims description 3
- 230000009471 action Effects 0.000 abstract description 15
- 230000000694 effects Effects 0.000 abstract description 10
- 238000006243 chemical reaction Methods 0.000 abstract description 5
- 238000000034 method Methods 0.000 abstract description 5
- 230000008569 process Effects 0.000 abstract description 5
- 230000010355 oscillation Effects 0.000 abstract description 3
- 239000010720 hydraulic oil Substances 0.000 description 7
- 230000009286 beneficial effect Effects 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 1
- 230000010354 integration Effects 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 230000035945 sensitivity Effects 0.000 description 1
- 230000011664 signaling Effects 0.000 description 1
- 230000007704 transition Effects 0.000 description 1
- 230000001960 triggered effect Effects 0.000 description 1
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
- 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
-
- 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
- F15B21/008—Reduction of noise or vibration
-
- 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
- F15B21/08—Servomotor systems incorporating electrically operated control 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
- F15B13/00—Details of servomotor systems ; Valves for servomotor systems
- F15B2013/002—Modular valves, i.e. consisting of an assembly of interchangeable components
- F15B2013/004—Cartridge valves
Landscapes
- 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)
- Apparatuses For Generation Of Mechanical Vibrations (AREA)
Abstract
The vibration table hydraulic system capable of automatically buffering and switching comprises a two-way cartridge valve I, a two-way cartridge valve II, a damping I, a damping II, a high-response electromagnetic directional valve, a hydraulic directional valve and a sensitive differential pressure transmitter, and is characterized in that the high-response electromagnetic directional valve works at high frequency to control the two-way cartridge valve to rapidly act, and the hydraulic directional valve is used for buffering control during high-speed switching, so that the sensitive differential pressure transmitter detects a differential pressure value in the action process to send an action signal, and the automatic buffering and switching function under the high-frequency working condition is achieved; the two-way cartridge valve is switched at high speed through high-frequency control of the high-response electromagnetic reversing valve, so that the effect of rapid oscillation is realized, and the condition that the switching speed cannot meet the requirement is avoided; the hydraulic reversing valve is used for buffer control during high-speed conversion, so that the effect of stable control under high-frequency operation is achieved, the pipeline and equipment are prevented from being damaged by high-frequency action impact, and the stability is higher.
Description
Technical Field
The invention relates to the technical field of vibrating tables, in particular to a vibrating table hydraulic system capable of automatically buffering and switching.
Background
With the gradual popularization of the domestic hydraulic vibration table and the high-frequency vibration device equipment, higher requirements are put forward on high-frequency automatic control and buffer switching treatment of a hydraulic system, particularly under the control of control frequency response of about 20HZ, a response electromagnetic reversing valve is used as a guide, a two-way cartridge valve is driven to be used as a main stage for transferring energy, and the combined control mode is always stable in the first place, so that the dynamic response during high-frequency operation can be overcome, and the hydraulic system has the advantages of high oil-passing capacity, high pollution resistance and high integration degree.
In the hydraulic system of the high-speed vibrating table in the prior art, the problem that the high-frequency dynamic response cannot follow exists, if the dynamic response is forcedly improved, reversing impact can be brought, so that a high-pressure pipeline in the hydraulic system is often broken to leak oil, the stability of use cannot be met under similar working conditions, and the hydraulic system becomes a technical problem to be overcome in the industry.
Therefore, the use requirement of the hydraulic system of the vibrating table is to stably control the automatic buffer switching function of the vibrating table. The automatic buffer switching function can automatically switch under the control frequency of 20HZ and has the function of buffering and preventing impact, so that the impact on a high-pressure pipeline or equipment is prevented. In the hydraulic system of the vibrating table used in the prior art, some control frequency response of 20HZ is not achieved, even if high-frequency reversing switching can be met, the generated pressure impact is large, equipment faults are frequently caused, and the stability of the use process cannot be guaranteed.
The hydraulic system of the high-frequency vibrating table in the prior art does not have a fully controlled high-speed main valve control function, so that the high-speed main valve can only give out the impact opening and closing action characteristic of high pressure in an extreme control mode when the vibrating table works at high frequency. In addition, the hydraulic control system of the vibrating table has no high-speed dynamic buffering function, the action switching control depends on time delay control, so that the hydraulic control system can not be suitable for various complex working conditions, delay the switching time of each vibration period, have no use stability, lead most of high-frequency vibrating tables to be unable to reach a high-frequency working state, and severely restrict the application and popularization of the hydraulic control high-frequency vibrating tables.
Disclosure of Invention
In order to solve the problems, the invention provides a vibrating table hydraulic system with automatic buffer switching, and provides a simple and reliable vibrating table hydraulic system with automatic buffer switching. In order to achieve the above purpose, the technical scheme adopted by the invention is as follows: the hydraulic system is provided with a total system oil source port, a vibrating table oil port and an oil return port, wherein the total system oil source port is a pipeline led out from an outlet of the high-pressure pump or in the high-pressure accumulator, the vibrating table oil port is a pipeline connected to the equipment actuator, and the oil return port is a pipeline connected to the oil tank.
The vibration table hydraulic system capable of automatically buffering and switching comprises a two-way cartridge valve I, a two-way cartridge valve II, a damping I, a damping II, a high-response electromagnetic directional valve, a hydraulic directional valve and a sensitive differential pressure transmitter, wherein the two-way cartridge valve I and the two-way cartridge valve II are respectively provided with an A port, a B port and a control cavity C, the control cavity C controls the opening and closing of a main valve core of the two-way cartridge valve, the opening and closing of the A port and the B port are controlled by the opening and closing of the main valve core of the two-way cartridge valve, the A port of the two-way cartridge valve I and the B port of the two-way cartridge valve II are respectively connected with an oil source port of a total system, the B port of the two-way cartridge valve I and the B port of the two-way cartridge valve are respectively connected with an oil port of a vibration table, the control cavity C of the two-way cartridge valve I is connected with the damping I, the A port of the high-response electromagnetic directional valve is connected with the other end of the damping I, the P port of the high-response electromagnetic directional valve is connected with the P port of the total system oil source port, the T port of the high-response electromagnetic directional valve is connected with an oil return port, the B port of the hydraulic directional valve is connected with the other end of the hydraulic directional valve, the hydraulic directional valve is connected with the other end of the hydraulic directional valve.
Compared with the prior art, the invention has the following beneficial effects: simple structure, high-frequency automatic buffer switching effect is obvious. The two-way cartridge valve is switched at high speed through high-frequency control of the high-response electromagnetic reversing valve, so that the effect of rapid oscillation is realized, and the condition that the switching speed cannot meet the requirement is avoided; the hydraulic reversing valve is used for buffer control during high-speed conversion, so that action impact is not generated during high-speed action switching of the vibrating table, the effect of stable control under high-frequency operation is achieved, pipelines and equipment are prevented from being damaged by high-frequency action impact, the application range is wider, and the stability is stronger.
Drawings
The present invention is described in further detail below with reference to the accompanying drawings.
FIG. 1 is a schematic diagram of the structure of the present invention;
In the accompanying drawings: 1. the device comprises two-way cartridge valves I and 2, two-way cartridge valves II and 3, damping I and 4, damping II and 5, a high-response electromagnetic reversing valve, a hydraulic reversing valve 6 and 7 and a sensitive differential pressure transmitter.
Detailed Description
In order to enable those skilled in the art to better understand the technical solution of the present invention, the present invention will be further described with reference to fig. 1 and a specific embodiment.
As shown in figure 1, an automatic buffer switching vibration table hydraulic system comprises a two-way cartridge valve I1, a two-way cartridge valve II 2, a damping I3, a damping II 4, a high-response electromagnetic reversing valve 5, a hydraulic reversing valve 6 and a sensitive differential pressure transmitter 7, wherein the two-way cartridge valve I1 and the two-way cartridge valve II 2 are respectively provided with an A port, a B port and a control cavity C, the control cavity C controls the opening and closing of a main valve core of the two-way cartridge valve, the opening and closing of the main valve core of the two-way cartridge valve control the A port and the B port, the two-way cartridge valve I1 and the B port of the two-way cartridge valve II 2 are respectively connected with a total system oil source port, the control cavity C of the two-way cartridge valve I1 and the B port of the two-way cartridge valve II 2 are respectively connected with an oil port of a vibration table, the A port of the high-response electromagnetic reversing valve 5 is connected with the other end of the damping I3, the P port of the high-response electromagnetic reversing valve 5 is connected with a P port of the total system oil source port, the sensitive differential pressure transmitter is connected with the hydraulic reversing valve 6 and the hydraulic reversing valve II 2 is connected with the other end of the hydraulic reversing valve, the hydraulic reversing valve 6 is connected with the hydraulic reversing valve 6 and the other end of the hydraulic reversing valve is connected with the hydraulic reversing valve II.
Further, the two-way cartridge valve I1 and the two-way cartridge valve II 2 are set to be TLC016AB40E-7X.
Further, the types of the damping I3 and the damping II 4 are set to NPT1/8-1.0.
Further, the model of the high-response electromagnetic directional valve 5 is set to GX-4WE6D50/AG24N9K4.
Further, the model of the hydraulic reversing valve 6 is set to GX-4WH6D50/AN9K4T.
Further, the model of the sensitivity differential signaling device 7 is set as GX-ZKF06-II.
The working principle and working process of the invention are as follows: the frequency of using the high-response electromagnetic directional valve 5 is fast. The two-way cartridge valve has the characteristics of large oil-passing capacity and high-speed conversion buffering of the hydraulic reversing valve 6, the high-response electromagnetic reversing valve 5 works at high frequency to control the two-way cartridge valve to rapidly act, the hydraulic reversing valve 5 performs buffering control during high-speed conversion, and the sensitive differential pressure transmitter 7 detects differential pressure values in the action process to send action signals so as to achieve the automatic buffering switching function under the high-frequency working condition. Simple structure, clear principle, high reliability and simple debugging. When faults occur, the problems are easy to check, and the problems are convenient to solve. Meanwhile, the production and manufacturing cost is low, the hydraulic vibration table can be completely popularized to other similar hydraulic equipment, the problem that a high-pressure pipeline in the hydraulic vibration table is frequently broken and leaked oil is solved under the condition of extremely low cost, and the service life of the equipment is prolonged.
The specific working principle is as follows: the oil source port of the total system is communicated with the port A of the two-way cartridge valve I1 and the two-way cartridge valve II 2, and is also communicated with the port P of the high-response electromagnetic directional valve 5, the port P of the hydraulic directional valve 6, a control port at one end and one end of the sensitive differential pressure transmitter 7; when the high-response electromagnetic reversing valve 5 is in a power-off state, the valve core of the high-response electromagnetic reversing valve 5 is in a parallel position, hydraulic oil is introduced into the port A from the port P of the high-response electromagnetic reversing valve 5 and then is communicated to the other end of the damper I3, one end of the damper I3 is communicated with the control cavity C of the two-way cartridge valve I1, the main valve core of the two-way cartridge valve I1 is in a closed state, the port P and one end control port of the hydraulic reversing valve 6 are driven by the pressure of the oil source port of the total system, the valve core of the hydraulic reversing valve 6 is shifted to a cross position, at the moment, the hydraulic oil is introduced into the port B through the port P of the hydraulic reversing valve 6 and then enters the other end of the damper II 4, and is communicated to the control cavity C of the two-way cartridge valve II 2 from one end of the damper II 4, so that the main valve core of the two-way cartridge valve II 2 is in the closed state, and hydraulic oil cannot enter the oil port of the vibrating table.
When the high-response electromagnetic directional valve 5 is electrified and commutated to a crossing position, hydraulic oil in a control cavity C of the two-way cartridge valve I1 flows back to an oil tank from a damping I3 to an opening A of the high-response electromagnetic directional valve 5, then flows into a port T of the high-response electromagnetic directional valve 5, at the moment, a main valve core of the two-way cartridge valve I1 is quickly opened, hydraulic oil flows to an oil port of a vibrating table through an opening B of the two-way cartridge valve I1, when the pressure of the oil port of the vibrating table rises to be approximately equal to that of a total system oil source, a control port of the hydraulic directional valve 6 drives the valve core to be shifted to a parallel position, hydraulic oil in a control cavity C of the two-way cartridge valve II 2 flows back to the oil tank through a damping II 4 to an opening B of the hydraulic directional valve 6, then flows to the oil tank through the opening T of the hydraulic directional valve 6, the main valve core of the two-way cartridge valve II 2 is quickly opened, the high-response electromagnetic directional valve 5 is powered off and reset to the parallel position of the valve core, and then the hydraulic oil flows to the opening A through the opening P of the high-response electromagnetic directional valve 5 and then is communicated to one end of the damping I, and the other end of the damping 3I is communicated with the other end of the two-way cartridge valve I1 through the two-way cartridge valve I1, and the two-way cartridge valve I1 is not communicated with the vibration table I is in a state of the vibration valve I is closed; the hydraulic reversing valve 6 is controlled by the damping II 4 to perform opening action, the opening characteristic of the hydraulic reversing valve 6 is controlled by the damping II 4 in a matching manner in the process, so that the hydraulic reversing valve 6 can be stably operated, the hydraulic reversing valve 6 can be quickly connected with the high-response electromagnetic reversing valve 5, the high-response electromagnetic reversing valve 5 is guided by the electromagnetic pilot valve to quickly enter a closed state, the opening of the hydraulic reversing valve 6 is controlled by stroke adjustment, the hydraulic reversing valve 6 is set on the basis of the matching of stable transition with the high-speed acting valve, the inlet and outlet of the hydraulic reversing valve 6 generate large pressure difference, the hydraulic pressure control valve is driven to push to a left working position for the second time, the hydraulic reversing valve 6 is forced to be quickly closed due to high-pressure control oil switched by the hydraulic pressure valve, the maximum hydraulic pressure difference is generated between the oil source port of the total system and the oil port of the vibrating table after the hydraulic reversing valve 6 is completely closed, and the sensitive differential pressure transmitter 7 is triggered and started to start to execute the next action cycle. Through the accurate combination of the automatic switching of the hydraulic reversing valve 6 and the sensitive differential pressure transmitter 7, the stable control of the high-frequency response hydraulic automatic switching vibrating table is realized.
Compared with the prior art, the invention has the following beneficial effects: simple structure, high-frequency automatic buffer switching effect is obvious. The two-way cartridge valve is switched at high speed through high-frequency control of the high-response electromagnetic reversing valve, so that the effect of rapid oscillation is realized, and the condition that the switching speed cannot meet the requirement is avoided; the hydraulic reversing valve is used for buffer control during high-speed conversion, so that action impact is not generated during high-speed action switching of the vibrating table, the effect of stable control under high-frequency operation is achieved, pipelines and equipment are prevented from being damaged by high-frequency action impact, the application range is wider, and the stability is stronger.
By using the technical scheme of the invention or under the inspired by the technical scheme of the invention, a similar technical scheme is designed by a person skilled in the art, so that the technical effects are achieved, and the technical effects fall into the protection scope of the invention.
Claims (8)
1. The vibration table hydraulic system capable of automatically buffering and switching comprises a two-way cartridge valve I (1), a two-way cartridge valve II (2), a damping I (3), a damping II (4), a high-response electromagnetic directional valve (5), a hydraulic directional valve (6) and a sensitive differential pressure signal generator (7), and is characterized in that the two-way cartridge valve I (1) and the two-way cartridge valve II (2) are respectively provided with an A port, a B port and a control cavity C, the A ports of the two-way cartridge valve I (1) and the two-way cartridge valve II (2) are respectively connected with a total system oil source port, the B ports of the two-way cartridge valve I (1) and the two-way cartridge valve II (2) are respectively connected with an oil port of a vibration table, the control cavity C of the two-way cartridge valve I (1) is connected with the damping I (3), the A port of the high-response electromagnetic directional valve (5) is connected with the other end of the damping I (3), the P port of the high-response electromagnetic directional valve (5) is connected with the total system oil source port, the T port of the high-response electromagnetic directional valve (5) is connected with the hydraulic directional valve (6) is connected with the hydraulic directional valve (4) at one end of the two-way cartridge valve II, the hydraulic directional valve (6) is connected with the other end of the hydraulic directional valve (4), the P port and one end control port of the hydraulic reversing valve (6) are respectively connected with the oil source port of the total system, the T port of the hydraulic reversing valve (6) is connected with the oil return port, one end of the sensitive differential pressure transmitter (7) is connected with the oil source port of the total system, and the other end of the sensitive differential pressure transmitter (7) is connected with the oil port of the vibrating table.
2. The automatic buffer switching vibrating table hydraulic system according to claim 1, wherein the two-way cartridge valve I (1) is set to TLC016AB40E-7X.
3. The automatic buffer switching vibrating table hydraulic system according to claim 1, wherein the two-way cartridge valve II (2) is set to TLC016AB40E-7X.
4. The automatic buffer switching vibrating table hydraulic system according to claim 1, wherein the damping I (3) is set to NPT1/8-1.0.
5. The automatic buffer switching vibrating table hydraulic system according to claim 1, wherein the type of the damper II (4) is set to NPT1/8-1.0.
6. The automatic buffer switching vibrating table hydraulic system according to claim 1, characterized in that the model of the high-response electromagnetic directional valve (5) is set to GX-4WE6D50/AG24N9K4.
7. The automatic buffer switching vibrating table hydraulic system according to claim 1, characterized in that the hydraulic reversing valve (6) is set to be GX-4WH6D50/AN9K4T.
8. The automatic buffer switching vibrating table hydraulic system according to claim 1, characterized in that the model of the sensitive differential pressure transmitter (7) is set as GX-ZKF06-II.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910951919.1A CN110594228B (en) | 2019-10-09 | 2019-10-09 | Automatic vibration table hydraulic system that buffering was switched |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910951919.1A CN110594228B (en) | 2019-10-09 | 2019-10-09 | Automatic vibration table hydraulic system that buffering was switched |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN110594228A CN110594228A (en) | 2019-12-20 |
| CN110594228B true CN110594228B (en) | 2024-06-07 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910951919.1A Active CN110594228B (en) | 2019-10-09 | 2019-10-09 | Automatic vibration table hydraulic system that buffering was switched |
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| Country | Link |
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| CN (1) | CN110594228B (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112648249B (en) * | 2020-12-18 | 2022-09-23 | 山东泰丰智能控制股份有限公司 | High-speed switching fluid infusion control system |
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| JPS5756734A (en) * | 1980-09-22 | 1982-04-05 | Hitachi Ltd | Start controller for tester |
| CN2293689Y (en) * | 1997-01-28 | 1998-10-07 | 华东冶金学院 | Two-way plug-in valve capable of realizing high frequency commutation |
| WO2004070230A1 (en) * | 2003-02-05 | 2004-08-19 | Kajima Corporation | Attenuation coefficient switching type hydraulic damper |
| CN202707661U (en) * | 2012-08-23 | 2013-01-30 | 中联重科股份有限公司渭南分公司 | Pilot buffer valve, buffer damping hydraulic control loop and engineering mechanical equipment |
| CN103883576A (en) * | 2013-12-31 | 2014-06-25 | 三一汽车起重机械有限公司 | Pounder hydraulic system and engineering machinery |
| CN104500483A (en) * | 2014-12-18 | 2015-04-08 | 太原重工股份有限公司 | Pilger pipe mill and flow and pressure quick-switching hydraulic control device thereof |
| CN210623244U (en) * | 2019-10-09 | 2020-05-26 | 山东泰丰智能控制股份有限公司 | Automatic shaking table hydraulic system that buffering switched |
-
2019
- 2019-10-09 CN CN201910951919.1A patent/CN110594228B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5756734A (en) * | 1980-09-22 | 1982-04-05 | Hitachi Ltd | Start controller for tester |
| CN2293689Y (en) * | 1997-01-28 | 1998-10-07 | 华东冶金学院 | Two-way plug-in valve capable of realizing high frequency commutation |
| WO2004070230A1 (en) * | 2003-02-05 | 2004-08-19 | Kajima Corporation | Attenuation coefficient switching type hydraulic damper |
| CN202707661U (en) * | 2012-08-23 | 2013-01-30 | 中联重科股份有限公司渭南分公司 | Pilot buffer valve, buffer damping hydraulic control loop and engineering mechanical equipment |
| CN103883576A (en) * | 2013-12-31 | 2014-06-25 | 三一汽车起重机械有限公司 | Pounder hydraulic system and engineering machinery |
| CN104500483A (en) * | 2014-12-18 | 2015-04-08 | 太原重工股份有限公司 | Pilger pipe mill and flow and pressure quick-switching hydraulic control device thereof |
| CN210623244U (en) * | 2019-10-09 | 2020-05-26 | 山东泰丰智能控制股份有限公司 | Automatic shaking table hydraulic system that buffering switched |
Non-Patent Citations (1)
| Title |
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| 二位四通水液压换向阀的设计与试验研究;陈远玲;魏威;任瑞文;卢煜海;杨青松;;液压与气动;20160615(第06期);全文 * |
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| CN110594228A (en) | 2019-12-20 |
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