CN209818412U - Hydraulic system for rolling mill servo pressing - Google Patents
Hydraulic system for rolling mill servo pressing Download PDFInfo
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- CN209818412U CN209818412U CN201920313204.9U CN201920313204U CN209818412U CN 209818412 U CN209818412 U CN 209818412U CN 201920313204 U CN201920313204 U CN 201920313204U CN 209818412 U CN209818412 U CN 209818412U
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Abstract
The utility model discloses a hydraulic system for rolling mill servo-down, including pump station and screwdown cylinder, the pump station is connected with main oil supply pipeline, main oil return pipeline and main overflow pipeline, screwdown cylinder is equipped with inlet port and outlet port, screwdown cylinder lateral wall is equipped with upper valve block and lower valve block, upper valve block and lower valve block are equipped with upper valve block inner oil circuit and lower valve block inner oil circuit, upper valve block inner oil circuit and lower valve block inner oil circuit between intercommunication have rubber tube assembly and normally closed gate valve; the utility model discloses a intercommunication has normally closed gate valve and rubber tube assembly between the non-rod chamber of pressure cylinder and the rod chamber, when changing hydraulic oil, open the normally closed gate valve, make hydraulic oil flow in from the inlet port, through last valve block, the normally closed gate valve under the open mode, lower valve block and oil gallery flow out, export the hydraulic oil that presses the non-rod chamber of pressure cylinder and have this two sections pipelines in the rod chamber and replace the filtration with the servo valve, reach the interior hydraulic oil cleanliness of improvement pipeline, reduce and remain the granule, improve the service life of servo valve and pressure cylinder.
Description
Technical Field
The utility model belongs to the technical field of hydraulic transmission, specifically relate to a hydraulic system that is used for rolling mill servo to push down.
Background
The medium and heavy plate hot rolling mill and the sheet cold rolling mill generally adopt a pressing system under the condition of electrically pressing down to add liquid and pressure to provide rolling force, are long in designed stroke, slow in response and low in adjustment precision under the condition of electrically pressing, and are only used for pre-swinging a roll gap before rolling; the hydraulic pressing stroke is short, the response is quick, the anti-interference performance is good, the adjusting precision is high, and the device is suitable for adjusting the roll gap in real time in the rolling process; therefore, the rolling force is mainly provided by hydraulic pressing in the hot rolling mill, and the rolling of the steel plate is completed; a typical hydraulic pressing system consists of a PLC controller, a servo valve and a hydraulic cylinder; the electric controller outputs servo valve control signals (voltage or current signals) to the servo valve to control the opening degree of the servo valve, different opening degrees correspond to different hydraulic oil flow rates, and then the hydraulic cylinder can provide different rolling forces for steel rolling.
In a hot rolling mill and a cold rolling mill, a servo pressing hydraulic system of the rolling mill is a difficult point and a key point in the work of a hydraulic technician, and is also a place with most faults, shutdown maintenance and overhaul, the requirements of high pressure, high temperature and high cleanness need to be overcome, the maintenance cost is high, particularly, the replacement cost of a pressing oil cylinder is 40-50 thousands per mill, the average service life of the pressing oil cylinder on each rolling mill of the current factory is about 2 years, the cost of a servo valve is 5-6 thousands per mill, and the average service life of the servo valve on each rolling mill is about 1 year; in the production process, besides the equipment cost, the problems of product loss, reduction of yield and the like caused by rolling force fluctuation, uneven surface thickness of a steel plate or a steel strip and strip breakage due to the failure of a servo valve and the failure of a pressing oil cylinder are solved, in order to improve the service life of the servo valve and a rolling mill, reduce the failure of a hydraulic system, reduce the product loss and improve the yield, filter elements are replaced regularly and hydraulic oil is replaced regularly, however, impurities and particles are invisibly brought into the hydraulic system in the process of equipment maintenance and spot inspection and replacement of the rubber tube, wherein in two sections of pipelines from an outlet of the servo valve to a rodless cavity and a rod cavity of the pressing oil cylinder, the hydraulic oil is not filtered for a long time, the impurities and the particles are remained in the pipeline all the time, a piston in the pressing oil cylinder is sealed and rubbed back and forth under high pressure, the piston in the pressing oil, the rolling force fluctuation causes the phenomena of different surface thicknesses of steel plates or steel strips and strip breakage, the valve core of the servo valve has very high requirement on the cleanliness of hydraulic oil, and sundries and particles remained in a pipeline are easy to wear the valve core and block, so that the service life of the servo valve is short, and the faults are many, therefore, the hydraulic system is required to be improved, the cleanliness of the hydraulic oil in the pipeline is favorably improved, the particle residue is reduced, and the service lives of the servo valve and a pressing oil cylinder are prolonged.
Disclosure of Invention
In view of this, the utility model aims at providing a hydraulic system for rolling mill servo screwdown, this a hydraulic system for rolling mill servo screwdown is through having normally closed gate valve and rubber tube assembly at screwdown hydro-cylinder rodless chamber and intercommunication between having the pole chamber, make hydraulic system when changing hydraulic oil, open normally closed gate valve, make hydraulic oil flow in from the inlet port, and through last valve block, normally closed gate valve under the open mode, lower valve block and oil gallery flow, make the servo valve export press the hydro-cylinder rodless chamber and have the hydraulic oil in these two sections pipelines of pole chamber to replace and filter, reach and improve the interior hydraulic oil cleanliness of pipeline, it remains to reduce the granule, improve the life of servo valve and screwdown hydro-cylinder.
In order to achieve the aim, the utility model relates to a hydraulic system for servo pressing of a rolling mill, which comprises a pump station and 1 pair of pressing cylinders which are oppositely arranged, the pump station is connected with a main oil supply pipeline, a main oil return pipeline and a main overflow pipeline, the screw-down oil cylinder is provided with an oil inlet hole and an oil outlet hole which are respectively communicated with the rodless cavity and the rod cavity, the oil inlet hole is communicated with the main oil supply pipeline through an oil inlet pipeline, the oil outlet hole is communicated with the main oil return pipeline through an oil outlet pipeline, an upper valve block and a lower valve block are arranged on the other side of the side wall of the pressing oil cylinder far away from the oil inlet hole and the oil return hole, the upper valve block and the lower valve block are respectively provided with an upper valve block internal oil way and a lower valve block internal oil way which are communicated with a rodless cavity and a rod cavity of the pressing oil cylinder, a rubber pipe assembly is communicated between the upper valve block internal oil way and the lower valve block internal oil way, and a normally closed gate valve for controlling the opening of an oil circuit in the upper valve block or the oil circuit in the lower valve block is arranged on the upper valve block or the lower valve block.
Further, a gate valve I and a pressure gauge which are communicated with an oil path in the lower valve block are arranged on the lower valve block, and a gate valve II, a pressure gauge and a pressure sensor which are communicated with an oil path in the upper valve block and the oil path in the lower valve block are arranged on the upper valve block.
Further, go up valve block and valve block down and can dismantle the connection on the hydro-cylinder that pushes down through the bolt, gate valve I and gate valve II can dismantle through the bolt respectively and connect on last valve block and valve block positive surface down, normally closed gate valve can dismantle through the bolt and connect on last valve block or valve block side down, the rubber tube assembly passes through flange joint or screwed joint and can dismantle the connection on the opposite side face that normally closed gate valve was kept away from to last valve block or valve block down.
Further, the main oil supply pipeline comprises a main oil supply high-pressure pipeline and a main oil supply medium-pressure pipeline, the main oil supply high-pressure pipeline is communicated with the rod-free cavity of the pressing oil cylinder through 2 oil inlet high-pressure pipelines, the main oil supply medium-pressure pipeline is communicated with the rod-free cavity of the pressing oil cylinder through an oil inlet medium-pressure pipeline, and the main oil supply medium-pressure pipeline is communicated with the rod-free cavity of the pressing oil cylinder through an oil outlet pipeline.
Furthermore, an energy accumulator, a pressure valve, a two-position two-way electromagnetic loading valve and 2 servo valves are arranged on the oil inlet high-pressure pipeline, an oil inlet hole of each servo valve is communicated with the main oil supply high-pressure pipeline through a one-way valve, an oil return hole of each servo valve is communicated with the main oil return pipeline, 1 oil outlet hole is communicated with a rodless cavity of the pressing oil cylinder, the other 1 oil outlet hole is in a closed state, the oil inlet holes of the energy accumulator, the pressure valve and the two-position two-way electromagnetic loading valve are communicated with the oil inlet hole of the servo valve, and the oil outlet holes of the pressure valve and the two-position two-way electromagnetic loading valve.
Further, a two-position four-way electromagnetic reversing valve I and a two-position four-way electromagnetic reversing valve II are arranged on the oil inlet medium pressure pipeline, an oil inlet hole of the two-position four-way electromagnetic reversing valve I is communicated with the main oil supply medium pressure pipeline, an oil return hole is communicated with the main oil return pipeline, a normal oil outlet hole is in a closed state, the other 1 reversing oil outlet hole is simultaneously communicated with 1 pair of screw-down oil cylinder rod cavities, an oil inlet hole of the two-position four-way electromagnetic reversing valve II is communicated with the main oil supply medium pressure pipeline, the oil return hole is communicated with the main oil return pipeline, the normal oil outlet hole is in a closed state, and the other 1 reversing oil outlet hole is simultaneously communicated with the screw-down oil cylinder rod-free cavity through 1.
The beneficial effects of the utility model reside in that:
the utility model discloses a hydraulic system for rolling mill servo screwdown is provided with valve block and lower valve block through the opposite side of keeping away from inlet port and oil gallery on the pressure cylinder lateral wall, go up valve block and lower valve block respectively with pressure cylinder rodless chamber and have the pole chamber intercommunication, it has the rubber tube assembly through normally closed gate valve intercommunication between going up on valve block and the lower valve block, make hydraulic system when changing hydraulic oil, open the normally closed gate valve, make hydraulic oil flow in from the inlet port, and through last valve block, open state lower normally closed gate valve, lower valve block and oil gallery flow, make the servo valve export press the cylinder rodless chamber and have the hydraulic oil in these two sections pipelines of pole chamber to replace the filtration, reach the interior hydraulic oil cleanliness of improvement pipeline, it remains to reduce the granule, improve the service life of servo valve and pressure cylinder.
Drawings
FIG. 1 is a schematic diagram of a hydraulic system for servo pressing of a rolling mill according to the present invention;
FIG. 2 is a front view of the hold-down cylinder of FIG. 1;
fig. 3 is a schematic diagram of a medium-pressure oil supply system of the medium-pressure lower oil cylinder in fig. 1.
Reference numerals: 1-pressing down the oil cylinder; 2-a servo valve; 3-an accumulator; 4-a pressure valve; 5-a two-position two-way electromagnetic loading valve; 6-overflow valve I; 7-overflow valve II; 8-two-position four-way electromagnetic directional valve I; 9-two-position four-way electromagnetic directional valve II; 10-a one-way valve; 10 a-a pilot operated check valve; 11-one-way throttle valve; 11 a-an oil supply throttle valve; 11 b-return throttle valve; 12-a gate valve I; 13-gate valve II; 14-normally closed gate valve; 15-a pressure sensor; 16-an upper valve block; 17-a lower valve block; 18-hose assembly; 19-a two-position three-way electromagnetic loading valve; 20-overflow valve III; LP-main supply high pressure line; MP-main oil supply medium pressure pipeline; t-main return line; y-main overflow line.
Detailed Description
The preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings.
Fig. 1-3 show a schematic structural diagram of a hydraulic system for servo-down of a rolling mill according to the present invention; the utility model relates to a hydraulic system for servo pressing of a rolling mill, which comprises a pump station and 1 pair of pressing oil cylinders which are oppositely arranged, the pump station is connected with a main oil supply pipeline, a main oil return pipeline T and a main overflow pipeline Y, the screw-down oil cylinder 1 is provided with an oil inlet hole and an oil outlet hole which are respectively communicated with the rodless cavity and the rod cavity, the oil inlet hole is communicated with the main oil supply pipeline through an oil inlet pipeline, the oil outlet hole is communicated with the main oil return pipeline through an oil outlet pipeline, an upper valve block 16 and a lower valve block 17 are arranged on the other side of the side wall of the pressing oil cylinder 1 far away from the oil inlet hole and the oil return hole, the upper valve block 16 and the lower valve block 17 are respectively provided with an inner oil way of the upper valve block and an inner oil way of the lower valve block which are communicated with the rodless cavity and the rod cavity of the screw-down cylinder 1, a rubber pipe assembly 18 is communicated between the inner oil way of the upper valve block and the inner oil way of the lower valve block, and a normally closed gate valve 14 for controlling the opening of an oil path in the upper valve block or the oil path in the lower valve block is arranged on the upper valve block 16 or the lower valve block 17.
In the embodiment, the upper valve block and the lower valve block are arranged on the other side, far away from the oil inlet hole and the oil return hole, of the side wall of the pressing oil cylinder, the upper valve block and the lower valve block are respectively communicated with the rodless cavity and the rod cavity of the pressing oil cylinder, and the rubber pipe assembly is communicated between the upper valve block and the lower valve block through the normally closed gate valve.
Preferably, the lower valve block 17 is provided with a gate valve I12 and a pressure gauge communicated with an oil path in the lower valve block, the upper valve block 16 is provided with a gate valve II13, a pressure gauge and a pressure sensor 15 communicated with an oil path in the upper valve block and an oil path in the lower valve block, the structure mainly utilizes the existing upper valve block 16 and the existing lower valve block 17 to be provided with the gate valve I12, the pressure gauge and the pressure sensor 15 to realize pressure control of a pressing oil cylinder, and a circulating oil path is arranged on the upper valve block 16 and the lower valve block 17, so that a rubber pipe assembly 18 and a normally closed gate valve 14 are conveniently arranged, and the equipment improvement cost is reduced.
Preferably, the upper valve block 16 and the lower valve block 17 are detachably connected to the pressing oil cylinder 1 through bolts, the gate valve I12 and the gate valve II13 are detachably connected to the front surfaces of the upper valve block 16 and the lower valve block 17 through bolts, the normally closed gate valve 14 is detachably connected to the side surface of the upper valve block 16 or the lower valve block 17 through bolts, the rubber pipe assembly 18 is detachably connected to the side surface of the other side, far away from the normally closed gate valve 14, of the upper valve block 16 or the lower valve block 17 through a flange joint or a threaded joint, and the structure limits the installation positions of the rubber pipe assembly 18 and the normally closed gate valve 14, is convenient to install and saves installation time.
Preferably, the main oil supply pipeline comprises a main oil supply high-pressure pipeline LP and a main oil supply medium-pressure pipeline MP, the main oil supply high-pressure pipeline LP is communicated with the rodless cavity of the pressing oil cylinder 1 through 2 oil inlet high-pressure pipelines, the main oil supply medium-pressure pipeline MP is communicated with the rodless cavity of the pressing oil cylinder 1 through an oil inlet medium-pressure pipeline, and the main oil supply medium-pressure pipeline MP is communicated with the rodless cavity of the pressing oil cylinder through an oil outlet pipeline.
Preferably, an energy accumulator 3, a pressure valve 4, a two-position two-way electromagnetic loading valve 5 and 2 servo valves 2 are arranged on the oil inlet high-pressure pipeline, an oil inlet of the servo valve 2 is communicated with a main oil supply high-pressure pipeline LP through a one-way valve, an oil return hole is communicated with a main oil return pipeline, 1 oil outlet is communicated with a rodless cavity of the pressing oil cylinder 1, the other 1 oil outlet is in a closed state, oil inlets of the energy accumulator 3, the pressure valve 4 and the two-position two-way electromagnetic loading valve 5 are communicated with an oil inlet of the servo valve, the pressure valve and the oil outlet of the two-position two-way electromagnetic loading valve 5 are communicated with a main oil return pipeline T, in the embodiment, before the servo valve 2 supplies high-pressure oil to the rodless cavity of the pressing oil cylinder 1, an electric signal does not control the two-position two-way electromagnetic loading valve 5 to act, hydraulic oil in the oil inlet high-pressure pipeline enters the main oil return pipeline, an oil way of the two-position two-way electromagnetic loading valve 5 is closed, hydraulic oil in the oil inlet high-pressure pipeline is loaded in an overflowing mode through the pressure valve 4, 330bar pressure oil is generated in the oil inlet high-pressure pipeline, at the moment, the servo valve 2 is controlled to work, 330bar pressure is formed in a rodless cavity of the pressing oil cylinder 1, and a steel plate or a plate strip is rolled.
Preferably, a two-position four-way electromagnetic directional valve I8 and a two-position four-way electromagnetic directional valve II9 are arranged on the oil inlet medium pressure pipeline, an oil inlet hole of the two-position four-way electromagnetic directional valve I8 is communicated with a main oil supply medium pressure pipeline MP, an oil return hole is communicated with a main oil return pipeline, a normal oil outlet hole is in a closed state, the other 1 reversing oil outlet hole is communicated with a rod cavity of the pressing oil cylinder 1 through a one-way valve and a one-way throttle valve, an oil inlet hole of the two-position four-way electromagnetic directional valve II9 is communicated with the main oil supply medium pressure pipeline MP, an oil return hole is communicated with a main oil return pipeline T, the normal oil outlet hole is in a closed state, the other 1 reversing oil outlet hole is communicated with a rodless cavity of the pressing oil cylinder 1 through the one-way valve and the one-way throttle valve, in the embodiment, the two-position four-way electromagnetic directional valve I8 is controlled by, the pressing oil cylinder 1 is driven to move downwards, after the pressing oil cylinder moves in place, the two-position two-way electromagnetic loading valve 5 is controlled by an electric signal to perform reversing action, and then the servo valve 2 works to roll a steel plate or a plate strip.
Preferably, the oil outlet of the servo valve 1 is communicated with an overflow valve I6, an overflow port of the overflow valve I6 is communicated with a main overflow pipeline Y, and the structure is favorable for adjusting the pressure of the oil outlet of the servo valve 1 and avoiding pressure fluctuation caused by impact on the servo valve 1.
Preferably, the oil outlets of the normally closed two-position four-way electromagnetic directional valve I8 and the normally closed two-position four-way electromagnetic directional valve II9 are communicated with an overflow valve II0, an overflow port of the overflow valve II0 is communicated with a main overflow pipeline Y, and the structure is favorable for adjusting the pressure of the oil outlets of the normally closed two-position four-way electromagnetic directional valve I8 and the normally closed two-position four-way electromagnetic directional valve II9 and avoiding the pressure fluctuation caused by impact on the normally closed two-position four-way electromagnetic directional valve I8 and the normally closed two-position four-way electromagnetic directional valve II 9.
The oil supply process of the hydraulic system for the servo pressing of the rolling mill comprises the following steps:
pressing action: starting a pump station, controlling a normally closed two-position four-way electromagnetic reversing valve II9 to perform reversing action through an electric signal, starting medium-pressure oil supply to a rodless cavity of a pressing oil cylinder 1, enabling a piston of the pressing oil cylinder 1 to move downwards, and returning hydraulic oil in a rod cavity of the pressing oil cylinder 1 to a main oil return pipeline T through a normally closed two-position four-way electromagnetic reversing valve I8;
rolling: the electric signal controls the two-position two-way electromagnetic loading valve 5 to perform reversing action, the oil way of the two-position two-way electromagnetic loading valve 5 is closed, hydraulic oil in a main oil supply high-pressure pipeline is loaded in an overflowing manner through the pressure valve 4, 330bar pressure oil is generated in the main oil supply high-pressure pipeline, at the moment, the servo valve 2 is controlled to work, the electric signal controls the normally closed two-position four-way electromagnetic reversing valve II9 of the servo valve 2 to stop working, 330bar pressure is formed in a rodless cavity of the pressing oil cylinder 1, and a steel plate or a plate strip is;
lifting action: the servo valve 2 is controlled to stop working through an electric signal, the main oil supply high-pressure pipeline is closed to stop supplying oil to the pressing oil cylinder 1, the normally closed two-position four-way electromagnetic directional valve I8 is controlled by the electric signal to perform a reversing action, medium-pressure oil supply is started for a rod cavity of the pressing oil cylinder 1, a piston of the pressing oil cylinder 1 moves upwards, and hydraulic oil in a rodless cavity of the pressing oil cylinder 1 returns to the main oil return pipeline T through the oil return throttling valve 11a and a hydraulic oil outlet of the hydraulic control one-way valve 10 a.
Quick discharge action: when the lifting mechanism moves, the normally closed two-position three-way electromagnetic directional valve is controlled to work through an electric signal, hydraulic oil of a main oil supply high-pressure pipeline LP enters through an oil inlet of the normally closed two-position three-way electromagnetic directional valve 19, an oil outlet of the normally closed two-position three-way electromagnetic directional valve 19 is communicated with a hydraulic oil port of a hydraulic control one-way valve 10a, the hydraulic control one-way valve 10a is opened, hydraulic oil of a rodless cavity of the pressing oil cylinder 1 is quickly drained through the hydraulic control one-way valve 10a, and the pressing oil cylinder 1;
and (3) cyclic action: and opening the normally closed gate valve, controlling the servo valve 2 to stop working through an electric signal, and controlling the normally closed two-position four-way electromagnetic directional valve I8 or the normally closed two-position four-way electromagnetic directional valve II9 to perform a reversing action through the electric signal, so that the hydraulic oil flows into the rodless cavity from the oil inlet hole and flows out through the oil inlet hole I, the oil passage in the upper valve block, the normally closed gate valve, the rubber pipe assembly 18, the oil passage in the lower valve block, the oil outlet hole I and the oil return hole, and the hydraulic oil in two pipelines, namely the rodless cavity and the rod cavity of the pressing oil cylinder from the oil outlet of the servo valve circularly flows out, enters the oil tank.
Finally, it is noted that the above-mentioned preferred embodiments illustrate rather than limit the invention, and that, although the invention has been described in detail with reference to the above-mentioned preferred embodiments, it will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the scope of the invention as defined by the appended claims.
Claims (6)
1. The utility model provides a hydraulic system for rolling mill is servo to be pushed down, includes pump station and 1 screwdown hydro-cylinder to relative setting, the pump station is connected with main oil feed line, main oil return line and main overflow pipeline, be provided with inlet port and the oil outlet that communicates with no pole chamber and pole chamber respectively on the screwdown hydro-cylinder, the inlet port is linked together through oil feed line and main oil feed line, the oil outlet is linked together its characterized in that through oil outlet pipeline and main oil return line: an upper valve block and a lower valve block are arranged on the other side, far away from the oil inlet hole and the oil return hole, of the side wall of the pressing oil cylinder, an upper valve block inner oil path and a lower valve block inner oil path which are communicated with a rodless cavity and a rod cavity of the pressing oil cylinder are respectively arranged in the upper valve block and the lower valve block, a rubber pipe assembly is communicated between the upper valve block inner oil path and the lower valve block inner oil path, and a normally closed gate valve for controlling the opening of the upper valve block inner oil path or the lower valve block inner oil path is arranged on the upper valve block or the lower valve block.
2. The hydraulic system for rolling mill servo reduction of claim 1, wherein: the upper valve block is provided with a gate valve II, a pressure gauge and a pressure sensor which are communicated with an oil path in the upper valve block and an oil path in the lower valve block.
3. The hydraulic system for rolling mill servo reduction of claim 2, wherein: go up valve block and lower valve block and can dismantle the connection through the bolt on pushing down the hydro-cylinder, gate valve I and gate valve II can dismantle through the bolt respectively and connect on last valve block and lower valve block positive surface, normally closed gate valve can dismantle through the bolt and connect on last valve block or lower valve block side, the rubber tube assembly can be dismantled through flange joint or screwed joint and connect on the opposite side that normally closed gate valve was kept away from to last valve block or lower valve block.
4. A hydraulic system for rolling mill servo reduction as claimed in any one of claims 1 to 3, wherein: the main oil supply pipeline comprises a main oil supply high-pressure pipeline and a main oil supply medium-pressure pipeline, the main oil supply high-pressure pipeline is communicated with the rod-free cavity of the pressing-down oil cylinder through 2 oil inlet high-pressure pipelines, the main oil supply medium-pressure pipeline is communicated with the rod-free cavity of the pressing-down oil cylinder through the oil inlet medium-pressure pipeline, and the main oil supply medium-pressure pipeline is communicated with the rod-free cavity of the pressing-down oil cylinder through an oil outlet pipeline.
5. The hydraulic system for rolling mill servo reduction of claim 4, wherein: the oil inlet high-pressure pipeline is provided with an energy accumulator, a pressure valve, a two-position two-way electromagnetic loading valve and 2 servo valves, an oil inlet hole of each servo valve is communicated with the main oil supply high-pressure pipeline through a one-way valve, an oil return hole of each servo valve is communicated with the main oil return pipeline, 1 oil outlet hole of each servo valve is communicated with a rodless cavity of the pressing oil cylinder, the other 1 oil outlet hole of each servo valve is in a closed state, the oil inlet holes of the energy accumulator, the pressure valve and the two-position two-way electromagnetic loading valve are all communicated with the oil inlet hole of the servo valve, and the oil outlet holes of the pressure valve and.
6. The hydraulic system for rolling mill servo reduction of claim 4, wherein: the oil inlet medium-pressure pipeline is provided with a two-position four-way electromagnetic reversing valve I and a two-position four-way electromagnetic reversing valve II, an oil inlet hole of the two-position four-way electromagnetic reversing valve I is communicated with the main oil supply medium-pressure pipeline, an oil return hole of the two-position four-way electromagnetic reversing valve I is communicated with the main oil return pipeline, a normal oil outlet hole is in a closed state, the other 1 reversing oil outlet hole is simultaneously communicated with 1 pair of pressing oil cylinder rod cavities, an oil inlet hole of the two-position four-way electromagnetic reversing valve II is communicated with the main oil supply medium-pressure pipeline, the oil return hole of the two-position four-way electromagnetic reversing valve II is communicated with the main oil return pipeline, the normal oil outlet hole is in a.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920313204.9U CN209818412U (en) | 2019-03-13 | 2019-03-13 | Hydraulic system for rolling mill servo pressing |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920313204.9U CN209818412U (en) | 2019-03-13 | 2019-03-13 | Hydraulic system for rolling mill servo pressing |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN209818412U true CN209818412U (en) | 2019-12-20 |
Family
ID=68875456
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201920313204.9U Expired - Fee Related CN209818412U (en) | 2019-03-13 | 2019-03-13 | Hydraulic system for rolling mill servo pressing |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN209818412U (en) |
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2019
- 2019-03-13 CN CN201920313204.9U patent/CN209818412U/en not_active Expired - Fee Related
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| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20191220 Termination date: 20210313 |
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| CF01 | Termination of patent right due to non-payment of annual fee |