CN109899330A - Hydraulic pressing down system in rolling mill - Google Patents
Hydraulic pressing down system in rolling mill Download PDFInfo
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- CN109899330A CN109899330A CN201910187114.4A CN201910187114A CN109899330A CN 109899330 A CN109899330 A CN 109899330A CN 201910187114 A CN201910187114 A CN 201910187114A CN 109899330 A CN109899330 A CN 109899330A
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Abstract
The invention discloses a kind of hydraulic pressing down system in rolling mill, including pumping plant and pressure oil cylinder, pumping plant is connected with main fuel feeding pressure duct, pressure pipe road in main fuel feeding, main oil return line, main overflow passage, fast oil extraction road and circulating oil path, pressure pipe road and pressure cylinder rod chamber and pressure oil cylinder rodless cavity unilaterally connected in main fuel feeding, main fuel feeding pressure duct and pressure oil cylinder rodless cavity unilaterally connected, circulating oil path is connected to pressure cylinder rod chamber and pressure oil cylinder rodless cavity simultaneously, normally closed gate valve is provided on circulating oil path, the present invention realizes that pressure oil cylinder is moved up and moved down by middle pressure oil road, unidirectional pressure rolling is realized using high-pressure oil passage high pressure oil one-way flow, pressure oil cylinder rodless cavity is connected to using circulating oil path and rod chamber realizes oil circulation, conveniently make to depress hydraulic oil in oil cylinder and carries out replacement cycles filtering, avoid servo valve card slag, reach and mentions Cleanliness of hydraulic oil in high pipeline reduces particle residue, improves servo valve and depresses the service life of oil cylinder.
Description
Technical field
The invention belongs to hydraulic transmission technology fields, are specifically related to hydraulic pressing down system in rolling mill.
Background technique
Hot Rolling Process For High Temperature Alloy Plate machine and cold sheet mill generally use Electro-pressing and the press down system of hydraulic pressing are added to provide rolling
Power, Electro-pressing design runlength length, low-response, degree of regulation are low, are only used for putting roll gap in advance before the rolling；Hydraulic pressing stroke
Short, response quickly, good in anti-interference performance, degree of regulation are high, are suitable for adjusting roll gap in real time during the rolling process；Therefore in hot rolling
Roll-force mainly is provided by hydraulic pressing in machine, completes the rolling of steel plate；One typical hydraulic press down system is by PLC
Controller, servo valve and hydraulic cylinder composition；It is watched by electric controller output servo valve control signal (voltage or current signal)
Valve is taken, controls the opening degree of servo valve, different opening degrees corresponds to different hydraulic fluid flow rates, and then hydraulic cylinder can provide difference
Roll-force be used for steel rolling.
In hot-rolling mill and cold-rolling mill, milling train servo pressure hydraulic system is the difficult point and again during hydraulic technique employee makees
Point, and break down, the place that shutdown maintenance and maintenance are most, it needs to overcome high pressure, high temperature and high-clean requirement, tie up
Protect it is at high cost, the especially renewal cost of pressure oil cylinder in 40-50 ten thousand/only, pressure oil cylinder on existing every milling train of our factory it is flat
Equal service life at 2 years or so, the cost of servo valve 5-6 ten thousand/, the servo valve average life span on every milling train was on 1 year left side
It is right；In process of production, other than equipment cost, there are also due to servo valve failure, depressing oil cylinder failure causes to roll Reeb
Dynamic, steel plate or steel strip surface thickness is different and belt phenomenon, the loss of bring product reduce the various problems such as lumber recovery,
In order to improve the service life of servo valve and milling train, hydraulic system fault is reduced, product loss is reduced, improves lumber recovery, mostly
Number regularly replaces hydraulic oil using periodic replacement filter core, however during maintenance of equipment and point inspection replacement sebific duct, invisible will be miscellaneous
Object and particle are brought into hydraulic system, wherein in servo valve oil outlet to pressure oil cylinder rodless cavity and rod chamber this two segment pipe
In, hydraulic oil is not filtered for a long time, and sundries and particle is caused to remain always in the duct, is depressed in-oil cylinder piston seal and is existed
It rubs back and forth under high pressure, is prone to wear in seriously causing and lets out, so as to cause pressure oscillation, rolling fluctuation leads to steel plate or steel band
Surface thickness is different and belt phenomenon, valve core of servo valve are very high to cleanliness of hydraulic oil requirement, remains in pipeline
Sundries and particle easily wear spool and blocking, cause servo valve service life short, failure is more, it is therefore desirable to hydraulic system
It improves, is conducive to improve cleanliness of hydraulic oil in pipeline, reduces particle residue, improve servo valve and depress the use of oil cylinder
Service life.
Summary of the invention
In view of this, the purpose of the present invention is to provide a kind of hydraulic pressing down system in rolling mill, the hydraulic pressing down system in rolling mill
By being provided with high-pressure oil passage, middle pressure oil road, fast oil extraction road and circulating oil path, by middle pressure oil road realize pressure oil cylinder move up and
It moves down, realizes unidirectional pressure rolling using high-pressure oil passage high pressure oil one-way flow, be connected to pressure oil cylinder rodless using circulating oil path
Chamber and rod chamber realize oil circulation, avoid servo valve card slag, conveniently make servo valve oil outlet to pressure oil cylinder rodless cavity and have
Hydraulic oil in this two segment pipe of rod cavity carries out circulating filtration, reaches and improves cleanliness of hydraulic oil in pipeline, reduces particle residue,
It improves servo valve and depresses the service life of oil cylinder.
In order to achieve the above object, a kind of hydraulic pressing down system in rolling mill of the present invention, including pumping plant and 1 pair of pressure being oppositely arranged
Lower oil cylinder, the pumping plant are connected with main fuel feeding pressure duct, pressure pipe road, main oil return line, main overflow passage, fast row in main fuel feeding
Oil circuit and circulating oil path, pressure pipe road is provided with normally closed type two-position four-way solenoid directional control valve I and normally closed type two in the main fuel feeding
Position four-way electromagnetic reversing valve II, the normally closed type two-position four-way solenoid directional control valve I and normally closed type two-position four-way solenoid directional control valve II
Oil outlet respectively with pressure cylinder rod chamber and depress oil cylinder rodless cavity unilaterally connected, be arranged on the main fuel feeding pressure duct
Have a servo valve, the servo valve oil outlet and pressure oil cylinder rodless cavity unilaterally connected, the circulating oil path simultaneously with pressure oil cylinder
Rod chamber is connected to pressure oil cylinder rodless cavity, and normally closed gate valve is provided on the circulating oil path, and the fast oil extraction road is provided with
Normally closed type two position, three-way electromagnetic change valve, the normally closed type two position, three-way electromagnetic change valve oil inlet and main fuel feeding pressure duct connect
It is logical, oil return opening is connected to main oil return line, oil outlet is communicated with hydraulic control one-way valve hydraulic control hydraulic fluid port, the fluid-control one-way valve inlet and
The connection of pressure oil cylinder rodless cavity, fluid-control one-way valve outlet are connected to main overflow passage.
Further, fuel feed hole for being connected to rodless cavity and rod chamber and fuel-displaced is provided on the pressure cylinder side wall
Hole, the fuel feed hole and oil outlet respectively with normally closed type two-position four-way solenoid directional control valve I and normally closed type two-position four-way electromagnetic switch
The oil outlet of valve II is connected to, and the other side far from fuel feed hole and oil return hole is provided with and pressure oil cylinder on the pressure cylinder side wall
The fuel feed hole I and oil outlet I that rodless cavity is connected to rod chamber, the circulating oil path include being sealed at fuel feed hole I and oil outlet I
Uuper valve block and lower valve block, be respectively arranged with the uuper valve block being connected to fuel feed hole I and oil outlet I in the uuper valve block and lower valve block
Oil circuit in interior oil circuit and lower valve block is communicated with hose assembly, the normally closed lock between oil circuit in oil circuit and lower valve block in uuper valve block
Valve is mounted on uuper valve block or lower valve block.
Further, the gate valve I and pressure gauge with oil communication in lower valve block, the uuper valve block are provided on the lower valve block
On be provided with gate valve II, pressure gauge and pressure sensor with oil communication in oil circuit in uuper valve block and lower valve block.
Further, the uuper valve block and lower valve block are detachably connected on pressure oil cylinder by bolt, the gate valve I and lock
Valve II passes through bolt respectively and is detachably connected on uuper valve block and lower valve block front surface, and the normally closed gate valve is detachable by bolt
It is connected on uuper valve block or lower valve block side, the hose assembly is detachably connected on by bump joint or nipple
Valve block or lower valve block are far from the other side side of normally closed gate valve.
Further, the main fuel feeding pressure duct be located on servo valve oil inlet pipeline be provided with accumulator, pressure valve and
Bi-bit bi-pass electromagnetism charge valve, the servo valve fuel feed hole is connected to by check valve with main fuel feeding pressure duct, oil return hole and master
Oil return line connection, normality oil outlet are connected to pressure oil cylinder rodless cavity, and another 1 commutation oil outlet is in close state, described
Accumulator, pressure valve and bi-bit bi-pass electromagnetism charge valve fuel feed hole are connected to servo valve fuel feed hole, the pressure valve overflow hole
It is connected to main oil return line with bi-bit bi-pass electromagnetism charge valve oil outlet.
Further, pipeline connection, oil return are pressed in the normally closed type two-position four-way solenoid directional control valve II fuel feed hole and main fuel feeding
The connection of Kong Yuzhu oil return line, normality oil outlet are in close state, and another 1 commutation oil outlet passes through 1 pair of check valve and 1 pair of list
It is connected to simultaneously with pressure oil cylinder rodless cavity to throttle valve.
Further, the servo valve oil outlet is communicated with overflow valve I, and the overflow valve I overflow port and main overflow passage connect
It is logical.
Further, the normally closed type two-position four-way solenoid directional control valve I and normally closed type two-position four-way solenoid directional control valve II go out
Hydraulic fluid port is communicated with overflow valve II, and the overflow valve II overflow port is connected to main overflow passage.
The beneficial effects of the present invention are:
Hydraulic pressing down system in rolling mill of the present invention by being provided with high-pressure oil passage, middle pressure oil road, fast oil extraction road and circulating oil path,
It realizes that pressure oil cylinder is moved up and moved down by middle pressure oil road, realizes unidirectional pressure rolling using high-pressure oil passage, utilize circulating oil path
Connection pressure oil cylinder rodless cavity and rod chamber realize oil circulation, avoid servo valve card slag, make servo valve oil outlet to pressure oil
Hydraulic oil in cylinder rodless cavity and rod chamber this two segment pipe carries out displacement outflow, reaches and improves cleanliness of hydraulic oil in pipeline,
Particle residue is reduced, servo valve is improved and depresses the service life of oil cylinder.
Detailed description of the invention
Fig. 1 is hydraulic pressing down system in rolling mill schematic diagram of the present invention；
Fig. 2 is the main view that oil cylinder is depressed in Fig. 1；
Fig. 3 is that the schematic diagram that oil supply system is pressed in oil cylinder is depressed in Fig. 1.
Appended drawing reference: 1- depresses oil cylinder；2- servo valve；3- accumulator；4- pressure valve；5- bi-bit bi-pass electromagnetism charge valve；
6- overflow valve I；7- overflow valve II；8- normally closed type two-position four-way solenoid directional control valve I；9- normally closed type two-position four-way solenoid directional control valve
II；10- check valve；10a- hydraulic control one-way valve；11- one-way throttle valve；11a- fuel feeding throttle valve；11b- meter out valve；12- lock
Valve I；13- gate valve II；The normally closed gate valve of 14-；15- pressure sensor；16- uuper valve block；17- lower valve block；18- hose assembly；19- is normal
Enclosed two position, three-way electromagnetic change valve；20- overflow valve III；The main fuel feeding pressure duct of LP-；Pressure pipe road in the main fuel feeding of MP-；T- master
Oil return line；The main overflow passage of Y-.
Specific embodiment
Below in conjunction with attached drawing, a preferred embodiment of the present invention will be described in detail.
It is as shown in Figs. 1-3 the structural schematic diagram of hydraulic pressing down system in rolling mill of the present invention；A kind of rolling mill hydraulic pressure of the present invention
Lower system, including the pressure oil cylinder 2 that pumping plant and 1 pair are oppositely arranged, the pumping plant is connected with main fuel feeding pressure duct LP, main fuel feeding
Middle pressure pipe road MP, main oil return line T, main overflow passage Y, fast oil extraction road and circulating oil path, in the main fuel feeding on the MP of pressure pipe road
It is provided with normally closed type two-position four-way solenoid directional control valve I8 and normally closed type two-position four-way solenoid directional control valve II9, the normally closed type two
The oil outlet of four-way electromagnetic reversing valve I8 and normally closed type two-position four-way solenoid directional control valve II9 respectively with pressure 1 rod chamber of oil cylinder and
Oil cylinder rodless cavity unilaterally connected is depressed, is provided with servo valve 2,2 oil outlet of servo valve on the main fuel feeding pressure duct LP
With pressure 1 rodless cavity unilaterally connected of oil cylinder, the circulating oil path connects with pressure 1 rod chamber of oil cylinder and pressure oil cylinder rodless cavity simultaneously
It is logical, normally closed gate valve 14 is provided on the circulating oil path, the fast oil extraction road is provided with the commutation of normally closed type two-position three-way electromagnetic
Valve 19,19 oil inlet of normally closed type two position, three-way electromagnetic change valve is connected to main fuel feeding pressure duct LP, oil return opening and leads back
Oil pipe line T connection, oil outlet are communicated with hydraulic control one-way valve 10a hydraulic control hydraulic fluid port, the hydraulic control one-way valve 10a entrance and pressure oil cylinder
The connection of 1 rodless cavity, fluid-control one-way valve outlet 10a are connected to main overflow passage Y.
The present embodiment gives pressure oil cylinder fuel feeding using 2 groups of pumps or duplex pump, and the progress according to pressure cylinder action is different
Oil circuit fuel feeding, wherein the pressure of main fuel feeding pressure duct LP is set as 330bar, the pressure of pressure pipe road M is set as in main fuel feeding
80bar。
The present embodiment is real by middle pressure oil road by being provided with high-pressure oil passage, middle pressure oil road, fast oil extraction road and circulating oil path
Now pressure oil cylinder is moved up and is moved down, and realizes unidirectional pressure rolling using high-pressure oil passage, using circulating oil path be connected to pressure oil cylinder without
Rod cavity and rod chamber realize oil circulation, avoid servo valve card slag, make servo valve oil outlet to pressure oil cylinder rodless cavity and have bar
Hydraulic oil in this two segment pipe of chamber carries out displacement outflow, reaches and improves cleanliness of hydraulic oil in pipeline, reduces particle residue, mentions
The service life of high servo valve and pressure oil cylinder.
Fuel feed hole for being connected to rodless cavity and rod chamber and fuel-displaced is provided on preferred pressure 1 side wall of oil cylinder
Hole, the fuel feed hole and oil outlet respectively with normally closed type two-position four-way solenoid directional control valve I8 and normally closed type two-position four-way electromagnetic switch
The oil outlet of valve II9 is connected to, and the other side far from fuel feed hole and oil return hole is provided with and pressure oil on pressure 1 side wall of oil cylinder
The fuel feed hole I and oil outlet I that 1 rodless cavity of cylinder is connected to rod chamber, the circulating oil path include being sealed in fuel feed hole I and oil outlet
Uuper valve block 16 and lower valve block 17 at I are respectively arranged with and fuel feed hole I and oil outlet I in the uuper valve block 16 and lower valve block 17
Oil circuit in oil circuit and lower valve block in the uuper valve block of connection is communicated with hose assembly between oil circuit in oil circuit and lower valve block in uuper valve block
18, the normally closed gate valve 14 is mounted on uuper valve block 16 or lower valve block 17, and the present embodiment makes hydraulic system when replacing hydraulic oil,
Open normally closed gate valve, make hydraulic oil from fuel feed hole flow into rodless cavity and by fuel feed hole I, oil circuit in uuper valve block, normally closed gate valve,
Oil circuit in hose assembly 18, lower valve block, oil outlet I and oil return hole outflow, make servo valve oil outlet to pressure oil cylinder rodless cavity with
Hydraulic oil in this two segment pipe of rod chamber carries out circulation outflow, into fuel tank in be filtered after be again introduced into hydraulic system
It is interior, reach and improve cleanliness of hydraulic oil in pipeline, reduce particle residue, improves servo valve and depress the service life of oil cylinder.
Be provided with the gate valve I12 and pressure gauge with oil communication in lower valve block on the preferred lower valve block 17, it is described on
Gate valve II13, pressure gauge and the pressure sensor with oil communication in oil circuit in uuper valve block and lower valve block are provided in valve block 16
15, which is mainly equipped with gate valve I12, pressure gauge and pressure sensor 15 using existing uuper valve block 16 and lower valve block 17,
Realize that the pressure to pressure oil cylinder controls, and by the way that circulating oil path to be mounted on uuper valve block 16 and lower valve block 17, is easily installed glue
Pipe assembly 18 and normally closed gate valve 14 reduce equipment improving cost.
The preferred uuper valve block 16 and lower valve block 17 are detachably connected on pressure oil cylinder 1 by bolt, the gate valve
I12 and gate valve II13 passes through bolt respectively and is detachably connected on 17 front surface of uuper valve block 16 and lower valve block, the normally closed gate valve
14 are detachably connected on 17 side of uuper valve block 16 or lower valve block by bolt, the hose assembly 18 by bump joint or
Nipple is detachably connected on the other side side of uuper valve block 16 or lower valve block 17 far from normally closed gate valve 14, and the structure is to glue
The installation site of pipe assembly 18 and normally closed gate valve 14 is defined, and installation is facilitated to save the set-up time.
The preferred main fuel feeding pressure duct LP, which is located on 2 oil inlet pipeline of servo valve, is provided with accumulator 3, pressure valve
4 and bi-bit bi-pass electromagnetism charge valve 5,2 fuel feed hole of servo valve is connected to by check valve with main fuel feeding pressure duct LP, oil return
The connection of Kong Yuzhu oil return line, normality oil outlet are connected to pressure 1 rodless cavity of oil cylinder, and another 1 commutation oil outlet, which is in, closes shape
State, the accumulator 3, pressure valve 4 and 5 fuel feed hole of bi-bit bi-pass electromagnetism charge valve are connected to 1 fuel feed hole of servo valve, the pressure
4 overflow hole of power valve and 5 oil outlet of bi-bit bi-pass electromagnetism charge valve are connected to main oil return line T, and the present embodiment is given in servo valve 2
Before 1 rodless cavity of oil cylinder is depressed for high pressure oil, electric signal does not control bi-bit bi-pass electromagnetism charge valve 5 and is acted, and main fuel feeding is high
Hydraulic oil enters main oil return line T by bi-bit bi-pass electromagnetism charge valve 5 in pressure pipe road, and electric signal control bi-bit bi-pass electromagnetism adds
It carries valve 5 and carries out commutation action, 5 oil circuit of bi-bit bi-pass electromagnetism charge valve is closed, and hydraulic oil passes through pressure in main fuel feeding pressure duct
4 overflow of valve load, generates the pressure oil of 330bar in main fuel feeding pressure duct, is worked, is being pressed by control servo valve 2 at this time
The pressure that 330bar is formed in lower 1 rodless cavity of oil cylinder, rolls steel plate or strip.
The preferred normally closed type two-position four-way solenoid directional control valve II9 fuel feed hole is connected to pressure pipe road MP in main fuel feeding, returns
Oilhole is connected to main oil return line T, and normality oil outlet is in close state, and another 1 commutation oil outlet passes through 1 pair of 10 He of check valve
1 pair of one-way throttle valve 11 is connected to pressure 1 rodless cavity of oil cylinder simultaneously.
Preferred 1 oil outlet of servo valve is communicated with overflow valve I6, the overflow valve I6 overflow port and main overflow passage Y
Connection, the structure are conducive to adjust 1 oil outlet pressure of servo valve, and servo valve 1 is avoided to be led to pressure oscillation by impact.
The preferred normally closed type two-position four-way solenoid directional control valve I8's and normally closed type two-position four-way solenoid directional control valve II9 goes out
Hydraulic fluid port is communicated with overflow valve II0, and the overflow valve II0 overflow port is connected to main overflow passage Y, and it is normal which is conducive to adjustment
The oil outlet pressure of enclosed two-position four-way solenoid directional control valve I8 and normally closed type two-position four-way solenoid directional control valve II9, avoid normally closed type
Two-position four-way solenoid directional control valve I8 and normally closed type two-position four-way solenoid directional control valve II9 is led to pressure oscillation by impact.
Its Fuel injection system of embodiment hydraulic pressing down system in rolling mill is as follows:
Pressure movement: it is dynamic to carry out commutation by electric signal control normally closed type two-position four-way solenoid directional control valve II9 for starting pumping plant
Make, starts middle pressure fuel feeding to pressure 1 rodless cavity of oil cylinder, move down pressure 1 piston of oil cylinder, pressure 1 rod chamber of oil cylinder is hydraulic
Oil returns to main oil return line T by normally closed type two-position four-way solenoid directional control valve I8；
Roll work: electric signal controls bi-bit bi-pass electromagnetism charge valve 5 and carries out commutation action, bi-bit bi-pass electromagnetism charge valve
5 oil circuits are closed, and hydraulic oil is loaded by 4 overflow of pressure valve in main fuel feeding pressure duct, are generated in main fuel feeding pressure duct
The pressure oil of 330bar is worked by control servo valve 2 at this time, and electric signal control 2 normally closed type two-position four-way electromagnetism of servo valve changes
It works and stops to valve II9, form the pressure of 330bar in pressure 1 rodless cavity of oil cylinder, steel plate or strip are rolled；
Lifting movement: controlling servo valve 2 by electric signal and stop working, and main fuel feeding pressure duct, which is closed, to be stopped giving pressure oil
1 fuel feeding of cylinder, electric signal control normally closed type two-position four-way solenoid directional control valve I8 and carry out commutation action, open to pressure 1 rod chamber of oil cylinder
Fuel feeding is pressed in beginning, moves up pressure 1 piston of oil cylinder, and pressure 1 rodless cavity hydraulic oil of oil cylinder passes through meter out valve 11a, liquid
The hydraulic control oil outlet of control check valve 10a returns to main oil return line T.
Fast row's movement: while lifting movement, controlling the work of normally closed type two position, three-way electromagnetic change valve by electric signal,
Main fuel feeding pressure duct LP hydraulic oil is entered by 19 oil inlet of normally closed type two position, three-way electromagnetic change valve, normally closed type two-position three way
19 oil outlet of solenoid directional control valve is communicated with hydraulic control one-way valve 10a hydraulic control hydraulic fluid port, opens hydraulic control one-way valve 10a, makes to depress oil cylinder 1
Rodless cavity hydraulic oil makes to depress 1 rapid increase of oil cylinder by hydraulic control one-way valve 10a quick fluid-discharge；
Circulation action: opening normally closed gate valve, controls servo valve 2 by electric signal and stops working, electric signal controls normally closed type
Two-position four-way solenoid directional control valve I8 or normally closed type two-position four-way solenoid directional control valve II9 carries out commutation action, makes hydraulic oil from oil inlet
Hole flows into rodless cavity and by oil circuit in fuel feed hole I, oil circuit in uuper valve block, normally closed gate valve, hose assembly 18, lower valve block, fuel-displaced
Hole I and oil return hole outflow, make servo valve oil outlet to the hydraulic oil depressed in oil cylinder rodless cavity and rod chamber this two segment pipe into
Row circulation outflow, into fuel tank in be filtered device filtering after be again introduced into hydraulic system.
Finally, it is stated that preferred embodiment above is only used to illustrate the technical scheme of the present invention and not to limit it, although logical
It crosses above preferred embodiment the present invention is described in detail, however, those skilled in the art should understand that, can be
Various changes are made to it in form and in details, without departing from claims of the present invention limited range.
Claims (8)
1. a kind of hydraulic pressing down system in rolling mill, the pressure oil cylinder being oppositely arranged including pumping plant and 1 pair, it is characterised in that: the pump
Station is connected with main fuel feeding pressure duct, pressure pipe road, main oil return line, main overflow passage, fast oil extraction road and recycle oil in main fuel feeding
Road, pressure pipe road is provided with normally closed type two-position four-way solenoid directional control valve I in the main fuel feeding and normally closed type two-position four-way electromagnetism changes
To valve II, the oil outlet of the normally closed type two-position four-way solenoid directional control valve I and normally closed type two-position four-way solenoid directional control valve II are distinguished
With pressure cylinder rod chamber and depress oil cylinder rodless cavity unilaterally connected, be provided with servo valve on the main fuel feeding pressure duct, institute
State servo valve oil outlet and pressure oil cylinder rodless cavity unilaterally connected, the circulating oil path simultaneously with pressure cylinder rod chamber and pressure
Oil cylinder rodless cavity is connected to, and normally closed gate valve is provided on the circulating oil path, and the fast oil extraction road is provided with normally closed type two three
Electric change valve, the normally closed type two position, three-way electromagnetic change valve oil inlet is connected to main fuel feeding pressure duct, oil return opening with
The connection of main oil return line, oil outlet be communicated with hydraulic control one-way valve hydraulic control hydraulic fluid port, the fluid-control one-way valve inlet and pressure oil cylinder without
Rod cavity connection, fluid-control one-way valve outlet are connected to main overflow passage.
2. hydraulic pressing down system in rolling mill as described in claim 1, it is characterised in that: be arranged on the pressure cylinder side wall useful
In the fuel feed hole and oil outlet that are connected to rodless cavity and rod chamber, the fuel feed hole and oil outlet respectively with normally closed type two-position four-way
Solenoid directional control valve I is connected to the oil outlet of normally closed type two-position four-way solenoid directional control valve II, on the pressure cylinder side wall far from into
The other side of oilhole and oil return hole be provided with pressure oil cylinder rodless cavity and the fuel feed hole I that is connected to of rod chamber and oil outlet I, it is described
Circulating oil path includes the uuper valve block and lower valve block being sealed at fuel feed hole I and oil outlet I, difference in the uuper valve block and lower valve block
Oil circuit in oil circuit and lower valve block, oil circuit and lower valve block in uuper valve block are provided in the uuper valve block being connected to fuel feed hole I and oil outlet I
Hose assembly is communicated between interior oil circuit, the normally closed gate valve is mounted on uuper valve block or lower valve block.
3. hydraulic pressing down system in rolling mill as claimed in claim 2, it is characterised in that: be provided on the lower valve block and lower valve block
The gate valve I and pressure gauge of interior oil communication are provided with and oil communication in oil circuit in uuper valve block and lower valve block on the uuper valve block
Gate valve II, pressure gauge and pressure sensor.
4. hydraulic pressing down system in rolling mill as claimed in claim 3, it is characterised in that: the uuper valve block and lower valve block pass through bolt
It is detachably connected on pressure oil cylinder, the gate valve I and gate valve II pass through bolt respectively and be detachably connected on uuper valve block and lower valve
On block front surface, the normally closed gate valve is detachably connected on uuper valve block or lower valve block side by bolt, the hose assembly
Uuper valve block or lower valve block are detachably connected on far from the other side side of normally closed gate valve by bump joint or nipple.
5. hydraulic pressing down system in rolling mill according to any one of claims 1-4, it is characterised in that: the main fuel feeding pressure duct
Accumulator, pressure valve and bi-bit bi-pass electromagnetism charge valve, the servo valve oil inlet are provided on servo valve oil inlet pipeline
Hole is by the way that check valve is connected to main fuel feeding pressure duct, oil return hole is connected to main oil return line, normality oil outlet and pressure oil cylinder
Rodless cavity connection, another 1 commutation oil outlet are in close state, the accumulator, pressure valve and bi-bit bi-pass electromagnetism charge valve
Fuel feed hole is connected to servo valve fuel feed hole, the pressure valve overflow hole and bi-bit bi-pass electromagnetism charge valve oil outlet with lead back
Oil pipe line connection.
6. hydraulic pressing down system in rolling mill as described in claim 1, it is characterised in that: the normally closed type two-position four-way electromagnetic switch
Valve II fuel feed hole presses pipeline connection, oil return hole to be connected to main oil return line with main fuel feeding, and normality oil outlet is in close state,
Another 1 commutation oil outlet is connected to pressure oil cylinder rodless cavity simultaneously by 1 pair of check valve and 1 pair of one-way throttle valve.
7. hydraulic pressing down system in rolling mill as described in claim 1, it is characterised in that: the servo valve oil outlet is communicated with overflow
Valve I, the overflow valve I overflow port are connected to main overflow passage.
8. hydraulic pressing down system in rolling mill as described in claim 1, it is characterised in that: the normally closed type two-position four-way electromagnetic switch
The oil outlet of valve I and normally closed type two-position four-way solenoid directional control valve II are communicated with overflow valve II, the overflow valve II overflow port with
Main overflow passage connection.
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| CN201910187114.4A CN109899330B (en) | 2019-03-13 | 2019-03-13 | Hydraulic pressing system of rolling mill |
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| CN201910187114.4A CN109899330B (en) | 2019-03-13 | 2019-03-13 | Hydraulic pressing system of rolling mill |
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| CN109899330B CN109899330B (en) | 2021-04-20 |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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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 |
| CN115815338A (en) * | 2023-01-10 | 2023-03-21 | 太原理工大学 | Hydraulic pressing system suitable for double-machine linkage ultra-large shaft wedge cross rolling mill |
| CN118437778A (en) * | 2024-05-10 | 2024-08-06 | 无锡市长江液压缸有限公司 | Control system of AGC depressing cylinder of large-scale rolling mill |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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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 |
| CN115815338A (en) * | 2023-01-10 | 2023-03-21 | 太原理工大学 | Hydraulic pressing system suitable for double-machine linkage ultra-large shaft wedge cross rolling mill |
| CN118437778A (en) * | 2024-05-10 | 2024-08-06 | 无锡市长江液压缸有限公司 | Control system of AGC depressing cylinder of large-scale rolling mill |
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