CN109899330B - Hydraulic pressing system of rolling mill - Google Patents
Hydraulic pressing system of rolling mill Download PDFInfo
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- CN109899330B CN109899330B CN201910187114.4A CN201910187114A CN109899330B CN 109899330 B CN109899330 B CN 109899330B CN 201910187114 A CN201910187114 A CN 201910187114A CN 109899330 B CN109899330 B CN 109899330B
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Abstract
The invention discloses a hydraulic pressing system of a rolling mill, which comprises a pump station and a pressing oil cylinder, wherein the pump station is connected with a main oil supply high-pressure pipeline, a main oil supply medium-pressure pipeline, a main oil return pipeline, a main overflow pipeline, a quick oil discharge pipeline and a circulating oil way, the main oil supply medium-pressure pipeline is communicated with a rod cavity of the pressing oil cylinder and a rodless cavity of the pressing oil cylinder in a one-way manner, the main oil supply high-pressure pipeline is communicated with the rodless cavity of the pressing oil cylinder in a one-way manner, the circulating oil way is communicated with the rod cavity of the pressing oil cylinder and the rodless cavity of the pressing oil cylinder simultaneously, and a normally closed gate valve is arranged on the circulating oil way. Reduce the particle and remain, improve the service life of servo valve and screwdown hydro-cylinder.
Description
Technical Field
The invention belongs to the technical field of hydraulic transmission, and particularly relates to a rolling mill hydraulic pressing system.
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 point inspection and replacement of the rubber tube, wherein the oil outlet of the servo valve is connected with two sections of pipelines of 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 pipelines all the time, a piston in the pressing oil cylinder is sealed and rubbed back and forth under high pressure, and the piston in, 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 the above, an object of the present invention is to provide a rolling mill hydraulic screwdown system, which is provided with a high-pressure oil path, a medium-pressure oil path, a fast oil discharge path and a circulating oil path, wherein the medium-pressure oil path is used to move a screwdown cylinder up and down, the high-pressure oil of the high-pressure oil path flows in a single direction to perform one-way screwdown rolling, and the circulating oil path is used to communicate a rodless cavity and a rod cavity of the screwdown cylinder to perform oil path circulation, so as to prevent jamming of a servo valve, facilitate circulation filtration of hydraulic oil in two pipelines, i.e., a rod-free cavity and a rod cavity of the screwdown cylinder from an oil outlet of the servo valve, thereby improving cleanliness of the hydraulic.
In order to achieve the purpose, the invention discloses a hydraulic pressing system of a rolling mill, which comprises a pump station and 1 pair of oppositely arranged pressing oil cylinders, wherein the pump station is connected with a main oil supply high-pressure pipeline, a main oil supply medium-pressure pipeline, a main oil return pipeline, a main overflow pipeline, a quick oil discharge pipeline and a circulating oil way, the main oil supply medium-pressure pipeline is provided with a normally closed two-position four-way electromagnetic directional valve I and a normally closed two-position four-way electromagnetic directional valve II, oil outlets of the normally closed two-position four-way electromagnetic directional valve I and the normally closed two-position four-way electromagnetic directional valve II are respectively communicated with a rod cavity of the pressing oil cylinder and a rod-free cavity of the pressing oil cylinder in a one-way manner, the main oil supply high-pressure pipeline is provided with a servo valve, the oil outlet of the servo valve is communicated with the rod cavity of the pressing oil cylinder in a one, the quick oil discharge pipeline is provided with a normally closed two-position three-way electromagnetic reversing valve, an oil inlet of the normally closed two-position three-way electromagnetic reversing valve is communicated with the main oil supply high-pressure pipeline, an oil return port is communicated with the main overflow pipeline, an oil outlet of the normally closed two-position three-way electromagnetic reversing valve is communicated with a hydraulic control oil port of a hydraulic control one-way valve, an inlet of the hydraulic control one-way valve is communicated with a rodless cavity of the pressing oil cylinder, and an outlet of.
Further, an oil inlet hole and an oil outlet hole which are used for being communicated with the rodless cavity and the rod cavity are formed in the side wall of the pressing oil cylinder, the oil inlet hole and the oil outlet hole are respectively communicated with an oil outlet of a normally-closed two-position four-way electromagnetic reversing valve I and an oil outlet of a normally-closed two-position four-way electromagnetic reversing valve II, an oil inlet hole I and an oil outlet hole I which are communicated with the rodless cavity and the rod cavity of the pressing oil cylinder are formed in the other side, far away from the oil inlet hole and the oil outlet hole, of the side wall of the pressing oil cylinder, the circulating oil path comprises an upper valve block and a lower valve block which are sealed at the oil inlet hole I and the oil outlet hole I, an inner oil path of the upper valve block and an inner oil path of the lower valve block which are communicated with the oil inlet hole I and the oil outlet hole I are respectively formed in the upper valve block and the lower valve block.
Further, a gate valve II 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 I, 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.
Furthermore, an energy accumulator, a pressure valve and a two-position two-way electromagnetic loading valve are arranged on the oil inlet pipeline of the servo valve of the main oil supply high-pressure pipeline, an oil inlet hole of the servo valve is communicated with the main oil supply high-pressure pipeline through a one-way valve, an oil return hole is communicated with the main oil return pipeline, a normal oil outlet hole is communicated with a rodless cavity of the pressing oil cylinder, the other 1 reversing 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 an overflow hole of the pressure valve and the oil outlet hole of the two-position two-way.
Further, an oil inlet hole of the normally closed two-position four-way electromagnetic reversing valve II is communicated with a main oil supply medium-pressure pipeline, an oil return hole is communicated with a main oil return pipeline, a normal oil outlet hole is in a closed state, and the other 1 reversing oil outlet hole is simultaneously communicated with a rodless cavity of the pressing oil cylinder through 1 pair of one-way valves and 1 pair of one-way throttle valves.
Furthermore, an oil outlet of the servo valve is communicated with an overflow valve I, and an overflow port of the overflow valve I is communicated with a main overflow pipeline.
Further, oil outlets of the normally closed two-position four-way electromagnetic reversing valve I and the normally closed two-position four-way electromagnetic reversing valve II are communicated with overflow valves II, and overflow ports of the overflow valves II are communicated with a main overflow pipeline.
The invention has the beneficial effects that:
the rolling mill hydraulic pressing system is provided with the high-pressure oil way, the medium-pressure oil way, the quick-discharge oil way and the circulating oil way, realizes the upward movement and the downward movement of the pressing oil cylinder through the medium-pressure oil way, realizes the one-way pressing rolling by utilizing the high-pressure oil way, realizes the oil way circulation by utilizing the circulating oil way to communicate the rodless cavity and the rod cavity of the pressing oil cylinder, avoids the slag jamming of the servo valve, ensures that the hydraulic oil in two sections of pipelines, namely the rodless cavity and the rod cavity of the pressing oil cylinder, from the oil outlet of the servo valve flows out in a replacement way, achieves the purposes of improving the cleanliness of the.
Drawings
FIG. 1 is a schematic diagram of a rolling mill hydraulic hold-down system of 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-normally closed two-position four-way electromagnetic directional valve I; 9-normally closed 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 normally closed two-position three-way electromagnetic directional 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
Preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings.
1-3 are schematic structural diagrams of the rolling mill hydraulic pressing system of the invention; the invention relates to a hydraulic pressing system of a rolling mill, which comprises a pump station and 1 pair of oppositely arranged pressing oil cylinders 1, wherein the pump station is connected with a main oil supply high-pressure pipeline LP, a main oil supply medium-pressure pipeline MP, a main oil return pipeline T, a main overflow pipeline Y, a quick oil discharge pipeline and a circulating oil way, the main oil supply medium-pressure pipeline MP is provided with a normally closed two-position four-way electromagnetic directional valve I8 and a normally closed two-position four-way electromagnetic directional valve II9, 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 respectively communicated with a rod cavity of the pressing oil cylinder 1 and a rod-free cavity of the pressing oil cylinder in a one-way manner, the main oil supply high-pressure pipeline LP is provided with a servo valve 2, an oil outlet of the servo valve 2 is communicated with the rod-free cavity of the pressing oil cylinder 1 in a one-way manner, the quick oil discharge pipeline is provided with a normally closed two-position three-way electromagnetic reversing valve 19, an oil inlet of the normally closed two-position three-way electromagnetic reversing valve 19 is communicated with a main oil supply high-pressure pipeline LP, an oil return port is communicated with a main overflow pipeline Y, an oil outlet of the normally closed two-position three-way electromagnetic reversing valve 19 is communicated with a hydraulic control oil port of a hydraulic control one-way valve 10a, an inlet of the hydraulic control one-way valve 10a is communicated with a rodless cavity of the pressing oil cylinder 1, and an outlet of the hydraulic control.
In the embodiment, 2 sets of pumps or dual pumps are adopted to supply oil to the pressing oil cylinder, and oil is supplied to different oil ways according to the action of pressing the oil cylinder, wherein the pressure of a main oil supply high-pressure pipeline LP is set to be 330bar, and the pressure of a main oil supply medium-pressure pipeline M is set to be 80 bar.
According to the embodiment, the high-pressure oil way, the medium-pressure oil way, the quick-discharge oil way and the circulating oil way are arranged, the pressing oil cylinder is moved up and down through the medium-pressure oil way, the high-pressure oil way is used for realizing one-way pressing rolling, the circulating oil way is used for communicating a rodless cavity and a rod cavity of the pressing oil cylinder to realize oil way circulation, the jamming of a servo valve is avoided, hydraulic oil in two pipelines from an oil outlet of the servo valve to the rodless cavity and the rod cavity of the pressing oil cylinder is replaced and flows out, the cleanliness of the hydraulic oil in the pipeline is improved, the particle residue is reduced.
Preferably, the side wall of the pressing oil cylinder 1 is provided with an oil inlet and an oil outlet which are used for being communicated with a rodless cavity and a rod cavity, the oil inlet and the oil outlet are respectively communicated with an oil outlet of a normally closed two-position four-way electromagnetic directional valve I8 and a normally closed two-position four-way electromagnetic directional valve II9, the other side of the side wall of the pressing oil cylinder 1, which is far away from the oil inlet and the oil outlet, is provided with an oil inlet I and an oil outlet I which are communicated with the rodless cavity and the rod cavity of the pressing oil cylinder 1, the circulating oil path comprises an upper valve block 16 and a lower valve block 17 which are sealed at the oil inlet I and the oil outlet I, an upper valve block inner oil path and a lower valve block inner oil path which are communicated with the oil inlet I and the oil outlet I are respectively arranged in the upper valve block 16 and the lower valve block 17, a rubber tube assembly 18 is communicated between the upper valve block inner oil path and the lower valve block oil path, the gate valve 14 is arranged on the upper, and opening the normally closed gate valve to enable hydraulic oil to flow into the rodless cavity from the oil inlet hole and flow out through the oil inlet hole I, the oil path in the upper valve block, the normally closed gate valve, the rubber tube assembly 18, the oil path in the lower valve block, the oil outlet hole I and the oil return hole, so that the hydraulic oil in two sections of pipelines from the oil outlet of the servo valve to the rodless cavity and the rod cavity of the pressing oil cylinder circularly flows out and enters the oil tank to be filtered and then enters the hydraulic system again, thereby achieving the purposes of improving the cleanliness of the hydraulic oil in the pipelines, reducing particle residues and prolonging the service life of the servo valve and.
Preferably, the lower valve block 17 is provided with a gate valve II13 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 I12, 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, an energy accumulator 3, a pressure valve 4 and a two-position two-way electromagnetic loading valve 5 are arranged on the oil inlet pipeline of the servo valve 2 of the main oil supply high-pressure pipeline LP, an oil inlet hole of the servo valve 2 is communicated with the main oil supply high-pressure pipeline LP through a one-way valve, an oil return hole is communicated with the main oil return pipeline, a normal oil outlet hole is communicated with a rodless cavity of the pressing-down oil cylinder 1, the other 1 reversing oil outlet holes are in a closed state, oil inlet holes 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 hole of the servo valve 2, an overflow hole of the pressure valve 4 and an oil outlet hole of the two-position two-way electromagnetic loading valve 5 are communicated with the main oil return pipeline T, in the embodiment, before the servo valve 2 supplies high-pressure oil to the rodless cavity of the pressing-down oil cylinder 1, an electric signal does not control the, 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 the main oil supply high-pressure pipeline is loaded in an overflowing mode 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, 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, an oil inlet hole of the normally closed two-position four-way electromagnetic reversing valve II9 is communicated with a main oil supply medium-pressure pipeline MP, an oil return hole is communicated with a main oil return pipeline T, a normal oil outlet hole is in a closed state, and the other 1 reversing oil outlet hole is simultaneously communicated with a rodless cavity of the pressing oil cylinder 1 through 1 pair of one-way valves 10 and 1 pair of one-way throttle valves 11.
Preferably, the oil outlet of the servo valve 2 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 2 and avoiding pressure fluctuation caused by impact on the servo valve 2.
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 III20, 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 rolling mill hydraulic pressing system of the embodiment is as follows:
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 detail may be made therein without departing from the scope of the invention as defined by the appended claims.
Claims (8)
1. The utility model provides a rolling mill hydraulic pressure screwdown system, includes pump station and 1 to the screwdown hydro-cylinder of relative setting, its characterized in that: the pump station is connected with a main oil supply high-pressure pipeline, a main oil supply medium-pressure pipeline, a main oil return pipeline, a main overflow pipeline, a quick oil discharge pipeline and a circulating oil way, the main oil supply medium-pressure pipeline is provided with a normally-closed two-position four-way electromagnetic reversing valve I and a normally-closed two-position four-way electromagnetic reversing valve II, oil outlets of the normally-closed two-position four-way electromagnetic reversing valve I and the normally-closed two-position four-way electromagnetic reversing valve II are respectively communicated with a rod cavity of a pressing oil cylinder and a rod cavity of the pressing oil cylinder in a one-way mode, a servo valve is arranged on the main oil supply high-pressure pipeline, an oil outlet of the servo valve is communicated with the rod cavity of the pressing oil cylinder in a one-way mode, the circulating oil way is communicated with the rod cavity of the pressing oil cylinder and the rod cavity of the pressing oil cylinder simultaneously, a, The oil outlet is communicated with a hydraulic control oil port of a hydraulic control one-way valve, the inlet of the hydraulic control one-way valve is communicated with the rodless cavity of the pressing oil cylinder, and the outlet of the hydraulic control one-way valve is communicated with the main oil return pipeline.
2. The rolling mill hydraulic reduction system of claim 1, wherein: the oil circulation system is characterized in that an oil inlet hole and an oil outlet hole which are communicated with a rodless cavity and a rod cavity are formed in the side wall of the pressing oil cylinder, the oil inlet hole and the oil outlet hole are communicated with an oil outlet of a normally-closed two-position four-way electromagnetic reversing valve I and an oil outlet of a normally-closed two-position four-way electromagnetic reversing valve II respectively, the other side, far away from the oil inlet hole and the oil outlet hole, of the side wall of the pressing oil cylinder is provided with an oil inlet hole I and an oil outlet hole I which are communicated with the rodless cavity and the rod cavity of the pressing oil cylinder, the circulation oil way comprises an upper valve block and a lower valve block which are sealed at the oil inlet hole I and the oil outlet hole I, an inner oil way of the upper valve block and an inner oil way of the lower valve block which are communicated with the oil inlet hole I and the oil outlet hole I are respectively arranged in the upper valve.
3. The rolling mill hydraulic reduction system of claim 2, wherein: the upper valve block is provided with a gate valve I, 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.
4. A rolling mill hydraulic reduction system as set forth in claim 3 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.
5. The rolling mill hydraulic reduction system of any one of claims 1 to 4, wherein: the main oil supply high-pressure pipeline is positioned on an oil inlet pipeline of the servo valve and is provided with an energy accumulator, a pressure valve and a two-position two-way electromagnetic loading valve, an oil inlet hole of the servo valve is communicated with the main oil supply high-pressure pipeline through a one-way valve, an oil return hole is communicated with a main oil return pipeline, a normal oil outlet hole is communicated with a rodless cavity of the pressing oil cylinder, the other 1 reversing 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 an overflow hole of the pressure valve and the oil outlet hole of the two-.
6. The rolling mill hydraulic reduction system of claim 1, wherein: and an oil inlet hole of the normally closed two-position four-way electromagnetic directional valve II is communicated with a main oil supply medium-pressure pipeline, an oil return hole is communicated with a main oil return pipeline, a normal oil outlet hole is in a closed state, and the other 1 reversing oil outlet hole is simultaneously communicated with a rodless cavity of the pressing oil cylinder through 1 pair of one-way valves and 1 pair of one-way throttle valves.
7. The rolling mill hydraulic reduction system of claim 1, wherein: the oil outlet of the servo valve is communicated with an overflow valve I, and an overflow port of the overflow valve I is communicated with a main overflow pipeline.
8. The rolling mill hydraulic reduction system of claim 1, wherein: and oil outlets of the normally closed two-position four-way electromagnetic reversing valve I and the normally closed two-position four-way electromagnetic reversing valve II are communicated with overflow valves II, and overflow ports of the overflow valves II are communicated with a main overflow pipeline.
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| CN113400194A (en) * | 2021-04-08 | 2021-09-17 | 齐重数控装备股份有限公司 | Hydraulic system of numerical control roller snagging machine tool |
| CN115815338B (en) * | 2023-01-10 | 2023-07-04 | 太原理工大学 | Hydraulic pressing system suitable for double-machine linkage ultra-large shaft wedge cross rolling mill |
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| CN202824153U (en) * | 2012-07-25 | 2013-03-27 | 中色科技股份有限公司 | Hydraulic control system for prestress oil cylinder of aluminum tape cast rolling machine |
| CN103008362A (en) * | 2012-11-27 | 2013-04-03 | 中色科技股份有限公司 | Hydraulic press-down parallel servo control method and loop for plate and strip rolling mill |
| CN103111471A (en) * | 2013-02-28 | 2013-05-22 | 浙江远景铝业有限公司 | Dual-roll rolling machine hydraulic pressing down system and operation method thereof |
| CN204099314U (en) * | 2014-07-15 | 2015-01-14 | 常州宝菱重工机械有限公司 | The automatic thickness hydraulic control system of high low pressure independence split |
| CN205117849U (en) * | 2015-11-19 | 2016-03-30 | 重庆钢铁(集团)有限责任公司 | Rolling mill is led a device and is prevented hydraulic system that falls |
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