CN112664655B - High-reliability fine cooling injection valve of cold rolling mill - Google Patents
High-reliability fine cooling injection valve of cold rolling mill Download PDFInfo
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- CN112664655B CN112664655B CN201910975670.8A CN201910975670A CN112664655B CN 112664655 B CN112664655 B CN 112664655B CN 201910975670 A CN201910975670 A CN 201910975670A CN 112664655 B CN112664655 B CN 112664655B
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Abstract
The invention discloses a high-reliability fine cooling injection valve of a cold rolling mill, which comprises a valve body, a lower end cover of an air cylinder and the air cylinder; the front end of the valve body is provided with a valve seat and a liquid inlet, the rear end of the valve body is connected with the front end of the lower end cover of the cylinder, and the rear end of the lower end cover of the cylinder is connected with the rod cavity of the cylinder; a valve rod is arranged in the valve body, and the rear end of the valve rod penetrates through the lower end cover of the cylinder, extends to the rod cavity of the cylinder and is connected with a piston in the rod cavity of the cylinder; the front end part of the valve rod is spherical, the valve port on the valve seat is spherical, and the front end part of the valve rod is in sealed fit with the valve port on the valve seat; the rear end of the valve rod is sleeved with a return spring, the front end part of the return spring is abutted against the rear end face of the lower end cover of the cylinder, and the rear end part of the return spring is abutted against a piston in a rod cavity of the cylinder; the cavity of the rod of the cylinder is also provided with an air return pipeline. The invention improves the performance index of the fine cooling valve and the field operation parameters, and overcomes the defect that the original injection valve is easy to be blocked by impurities because emulsion enters the control valve and the valve core.
Description
Technical Field
The invention relates to the technology of cold continuous rolling mills, in particular to a high-reliability fine cooling injection valve of a cold rolling mill.
Background
In order to obtain better plate shape, the cold continuous rolling unit in China is sequentially provided with a fine cooling device. Practice proves that better strip steel plate shape and surface quality can be obtained by cooling the working rolls and the steel plates by emulsion in a sectional manner in the process of rolling wide thin strip steel, but the current fine cooling device still has some problems to be improved in production practice.
In actual use, the emulsion injection valve is opened and closed by a special model algorithm based on the residual plate profile deviation measured on the outlet plate roll.If the pressure is higher than a certain threshold value, the nozzles are opened, and if the pressure is lower than the certain threshold value, the nozzles are closed, so that some nozzles need to be opened and closed frequently, and if the nozzles cannot be opened or closed normally, the nozzles cannot play a role in adjusting the plate type and can make the plate type worse. However, as shown in fig. 1, when the compressed air is not supplied, the pressure at the air end of the injection valve is zero and the pressure at the emulsion end is P 1 The spring force of the right end of the valve core 100 is F, and when P is met 1 A 1 When F is greater than F, the valve core 100 moves to the right side, the valve port is opened, the emulsion enters the injection port, and the emulsion is sprayed out. When the compressed air is connected, the pressure of the air end and the emulsion end of the injection valve are respectively P 2 And P 1 When P is satisfied 2 A 2 +F＞P 1 A 1 When in use, the valve core 100 moves towards the left side until the valve port is closed, but the service life of the injection valve is not long due to structural defects, firstly, emulsion in an emulsion loop easily enters a control gas circuit through the valve core, and the emulsion enters a pneumatic control valve to cause the pneumatic valve to fail; secondly, the valve core is easily blocked by impurities such as ferrous powder in the emulsion, so that the valve core is in a normally open state or a normally closed state, and the control effect is lost.
In the existing patent application, as disclosed in patent application No. 200910194489.X, a direct-acting type fine cooling electromagnetic injection valve for cooling a cold-rolled strip plate roller comprises an injection nozzle assembly, an injection beam, a valve core, a valve body, an electromagnet assembly and cooling liquid. The electromagnet assembly and the valve core are assembled to form a valve body, and the electromagnet assembly is of a solenoid structure; the spray nozzle assembly consists of a spray nozzle body and a spray nozzle; the spray beam is a base which is organically connected with the rolling mill; the valve core is made of heat-resistant, corrosion-resistant and non-deformable inlet sealing materials. The invention directly controls the electromagnetic valve by the electric signal of the online plate shape, accurately adjusts the flow of the cooling liquid sprayed out by the spray valve in unit time by adjusting the pulse width of the electric signal, adjusts the thermal convexity of the roller by cooling the roller in sections, accurately solves the thermal convexity of the online roller in different sections, ensures the quality of cold-rolled strip plates and improves the rolling linear speed of a rolling mill. The technical scheme of the patent utilizes an electromagnet assembly to directly drive a valve core of the injection valve, although the principle is feasible, the injection valve is installed in a high-temperature and high-humidity rack environment, so that the problem of direct application of an electromagnet on reliability is solved, and the service life is generally not long. Injection valves of this type are also rarely practical in the field at present.
As also disclosed in patent application No. 200620125639.3, the variable flow injection valve for rolling oil is provided, in which a valve seat penetrates through a side wall of a beam body and extends into the beam body, a pressing flange is disposed at the other side of the beam body and is in threaded connection with the valve seat to form an inner cavity space, an inner circle of the pressing flange is provided with an axial positioning convex edge, the inner circle of the valve seat is also provided with an axial positioning convex edge, a sealing elastic gasket, a static ceramic sheet, a dynamic ceramic sheet and a rotating shaft are disposed in the inner cavity space, the sealing elastic gasket is in contact with the positioning convex edge of the inner circle of the pressing flange, the dynamic ceramic sheet and the static ceramic sheet form a variable flow sealing pair, one end of the rotating shaft is connected with the dynamic ceramic sheet, and the other end of the rotating shaft is exposed to be connected with a stepping motor; the front end of the valve seat is provided with an oil port corresponding to an oil duct of the variable flow sealing pair; the movable ceramic chip sector grooves and the static ceramic chip sector grooves are matched at different positions to form variable flow windows with different sizes. The technical scheme realizes the continuous variable flow adjustment of the rolling oil, is favorable for improving the cooling control level of the rolling mill, and meets the requirement of nonferrous metal processing. However, the technical scheme of the patent relates to a continuous control technology for the valve port of the injection valve, a stepping motor is used as a control element, and the size of the continuously variable valve port is generated between the stepping motor and a static ceramic piece through the rotation of a movable ceramic piece, so that the injection quantity of the emulsion is controlled. The technical structure is complex, the stepping motor is arranged inside the rack, the reliability is high, and the service life is not long.
Disclosure of Invention
Aiming at the defects in the prior art, the invention aims to provide the high-reliability fine cooling injection valve of the cold rolling mill, which is improved to a certain extent on the basis of meeting the performance index of the fine cooling valve and the field operation parameters and overcomes the defect that the original injection valve is easy to be stuck by impurities in emulsion because the emulsion enters the control valve and the valve core.
In order to realize the purpose, the invention adopts the following technical scheme:
a high-reliability fine cooling injection valve of a cold rolling mill comprises a valve body, a lower end cover of an air cylinder and the air cylinder;
the front end of the valve body is provided with a valve seat and a liquid inlet, the rear end of the valve body is connected with the front end of the lower end cover of the air cylinder, and the rear end of the lower end cover of the air cylinder is connected with the rod cavity of the air cylinder;
a valve rod is arranged in the valve body, and the rear end of the valve rod penetrates through the lower end cover of the cylinder, extends to the rod cavity of the cylinder and is connected with a piston in the rod cavity of the cylinder;
the front end part of the valve rod is arranged to be spherical, the valve port on the valve seat is arranged to be spherical, and the front end part of the valve rod is in close fit with the valve port on the valve seat;
a return spring is sleeved on the rear end of the valve rod, the front end part of the return spring is abutted against the rear end face of the lower end cover of the cylinder, and the rear end part of the return spring is abutted against a piston in a rod cavity of the cylinder;
and a gas return pipeline is also arranged in the rod cavity of the cylinder.
And guide sleeves are arranged between the valve body and the valve rod and between the lower end cover of the air cylinder and the valve rod.
O-shaped rings are arranged between the valve seat and the valve body, between the valve body and the lower end cover of the air cylinder, between the lower end cover of the air cylinder and between the lower end cover of the air cylinder and the valve rod.
And a check ring is also arranged between the lower end cover of the cylinder and the valve core.
And O-shaped rings are arranged on the outer side of the front end of the valve body and the outer side of the lower end cover of the air cylinder.
And a Gray ring is arranged on the outer side of the piston.
The liquid inlets are four and arranged at intervals of 90 degrees.
The high-reliability fine cooling injection valve of the cold rolling mill, provided by the invention, overcomes the two defects that an emulsion is easy to block an air loop and a valve core is easy to block impurities in the emulsion as soon as possible in the prior art, and the problem of blocking of the impurities occurs after the original injection valve is used for 3 months.
Drawings
FIG. 1 is a schematic illustration of a prior art injection valve;
FIG. 2 is a schematic diagram of the structure of the injection valve of the present invention;
fig. 3 is a diagram of the state of use of the injection valve according to the invention.
Detailed Description
The technical scheme of the invention is further explained by combining the drawings and the embodiment.
Referring to fig. 2, the high-reliability fine cooling injection valve of the cold rolling mill provided by the invention comprises a valve body 1, a cylinder lower end cover 2 and a cylinder 3.
Preferably, a valve seat 4 and a liquid inlet 5 are arranged at the front end of the valve body 1, the rear end of the valve body 1 is hermetically connected with the front end of the cylinder lower end cover 2, the rear end of the cylinder lower end cover 2 is hermetically connected with a rod cavity of the cylinder 3, and a nozzle mounting opening 8 is arranged on the valve seat 4.
Preferably, a valve rod 6 is arranged in the valve body 1, the rear end of the valve rod 6 penetrates through the lower end cover 2 of the cylinder, extends to the rod cavity of the cylinder 3, and is connected with a piston 7 in the rod cavity of the cylinder 3, and an air inlet 10 is arranged at the rear end of the cylinder 3. The power source for controlling the valve rod 6 is made into a complete cylinder form, so that the contact between emulsion and compressed air is effectively isolated, and the driving force of the valve rod 6 is increased.
Preferably, the front end of the valve rod 6 is spherical, the valve port on the valve seat 4 is spherical, the front end of the valve rod 6 and the valve port on the valve seat 4 form a sealing fit, and the valve port on the valve seat 4 is communicated with the nozzle mounting port 8. The front end part of the valve rod 6 is spherical, so that the area of emulsion entering the injection port cavity 12 is enlarged on the basis of ensuring zero leakage, and the phenomenon that the valve rod 6 is blocked and cannot be opened due to impurities such as iron powder and the like is favorably reduced.
Preferably, a return spring 9 is sleeved on the rear end of the valve rod 6, the front end of the return spring 9 abuts against the rear end face of the cylinder lower end cover 2, and the rear end of the return spring 9 abuts against the piston 7 in the rod cavity of the cylinder 3.
Preferably, the rod cavity of the cylinder 3 is further provided with an air return pipeline 11, and when emulsion enters the rod cavity of the cylinder 3, the emulsion can return to the outside of the valve body 1 through the air return pipeline 11 and cannot enter the control air circuit.
Preferably, guide sleeves 13 are arranged between the valve body 1 and the valve rod 6 and between the cylinder lower end cover 3 and the valve rod 6, and are used for guiding and sealing the valve rod 6.
Preferably, the outer side of the front end of the valve body 1 and the outer side of the cylinder lower end cover 2 are both provided with an O-ring 14 for sealing between the injection valve and the injection beam box body.
Preferably, O-rings 15 are arranged between the valve seat 4 and the valve body 1, between the valve body 1 and the cylinder lower end cover 2, between the cylinder lower end cover 2 and the cylinder 3, and between the cylinder lower end cover 2 and the valve rod 6, and are used for sealing to prevent emulsion from entering the cylinder.
Preferably, a retainer ring 16 is further disposed between the cylinder lower end cover 2 and the valve core 3 for positioning the guide sleeve 13.
Preferably, a Glare ring 17 is arranged on the outer side of the piston 7 and used for sealing a rod cavity and a rodless cavity of the cylinder.
Preferably, four liquid inlets 5 are arranged at 90-degree intervals and used for allowing the emulsion to flow in.
The injection valve is arranged in an injection beam box, emulsion enters the injection port cavity 12 through four liquid inlets 5 at the front end of the valve body 1 at intervals of 90 degrees, the injection valve is in an open state shown in figure 2, the valve rod 6 is connected with the piston 7 with a rod cavity of the cylinder 3, at the moment, the piston 7 is pressed to the right side of the cylinder by the return spring 9, so the valve rod 6 is separated from the valve seat 4, a valve port is opened, and the emulsion with pressure is injected through a nozzle arranged at the position of the nozzle mounting port 8.
When compressed air is introduced into the air inlet 10, the compressed air pushes the piston 7 to overcome the return spring 9 to move leftwards, so as to drive the valve rod 6 to move leftwards, the front end part of the valve rod 6 is spherical and matched with a spherical valve port on the valve seat 4, the valve port is closed, and the emulsion is sealed in the jet port cavity 12 and cannot be sprayed out. While the gas in the rod chamber of the cylinder 3 is discharged through the return gas line 11.
Referring to fig. 3, the injection valves 200 of the present invention are installed in the upper and lower injection beams 18, 19, each of which has three rows of nozzles, each row has 25 injection valves 200 of the present invention, and 150 injection valves 200 of the present invention are installed in the upper and lower injection beams 18, 19, respectively, and selectively spray emulsion to three positions of the roll gap between the upper and lower work rolls 21, 22, the work roll itself, and the roll gap between the work roll and the middle roll according to the plate shape detected by the plate shape detector 20, some injection valves require closing, some injection valves require opening, and fast switching is performed according to the plate shape. The opening and closing of the injection valves is connected to a pneumatic control system 25 through air pipes connected to the individual valves, and control air pipes 23, 24 through the upper and lower injection beams.
It should be understood by those skilled in the art that the above embodiments are only for illustrating the present invention and are not to be used as a limitation of the present invention, and that changes and modifications to the above described embodiments are within the scope of the claims of the present invention as long as they are within the spirit and scope of the present invention.
Claims (2)
1. The utility model provides a fine cooling injection valve of cold rolling mill of high reliability which characterized in that: comprises a valve body, a lower end cover of a cylinder and the cylinder;
the front end of the valve body is provided with a valve seat and a liquid inlet, the rear end of the valve body is connected with the front end of the lower end cover of the air cylinder, and the rear end of the lower end cover of the air cylinder is connected with the rod cavity of the air cylinder;
a valve rod is arranged in the valve body, and the rear end of the valve rod penetrates through the lower end cover of the cylinder, extends to the rod cavity of the cylinder and is connected with a piston in the rod cavity of the cylinder;
the front end part of the valve rod is arranged to be spherical, the valve port on the valve seat is arranged to be spherical, and the front end part of the valve rod is in close fit with the valve port on the valve seat;
the rear end of the valve rod is sleeved with a return spring, the front end part of the return spring is abutted against the rear end face of the lower end cover of the cylinder, and the rear end part of the return spring is abutted against a piston in a rod cavity of the cylinder;
the rod cavity of the cylinder is also provided with an air return pipeline, when emulsion enters the rod cavity of the cylinder, the emulsion can return to the outside of the valve body through the air return pipeline and cannot enter the control air circuit,
o-shaped rings are arranged between the valve seat and the valve body, between the valve body and the lower end cover of the air cylinder, between the lower end cover of the air cylinder and between the lower end cover of the air cylinder and the valve rod;
a check ring is arranged between the lower end cover of the cylinder and the valve rod;
o-shaped rings are arranged on the outer side of the front end of the valve body and the outer side of the lower end cover of the air cylinder;
a GREEN ring is arranged on the outer side of the piston;
the liquid inlets are four and arranged at intervals of 90 degrees.
2. The fine cooling injection valve of the high-reliability cold rolling mill as claimed in claim 1, characterized in that: and guide sleeves are arranged between the valve body and the valve rod and between the lower end cover of the air cylinder and the valve rod.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910975670.8A CN112664655B (en) | 2019-10-15 | 2019-10-15 | High-reliability fine cooling injection valve of cold rolling mill |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910975670.8A CN112664655B (en) | 2019-10-15 | 2019-10-15 | High-reliability fine cooling injection valve of cold rolling mill |
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| Publication Number | Publication Date |
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| CN112664655A CN112664655A (en) | 2021-04-16 |
| CN112664655B true CN112664655B (en) | 2022-09-20 |
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CH109552A (en) * | 1924-04-22 | 1925-04-01 | Rochefort Francois | Fuel injection device for internal combustion engines. |
| GB598566A (en) * | 1945-05-22 | 1948-02-20 | H M Hobson Aircraft & Motor Co | Improvements in fuel injection systems for internal combustion engines |
| JPH10103192A (en) * | 1996-09-25 | 1998-04-21 | Mitsubishi Heavy Ind Ltd | Two fluid injection valve |
| CN200986026Y (en) * | 2006-12-04 | 2007-12-05 | 苏州有色金属加工研究院 | Air cylinder type roller milling oil injection valve |
| JP2010190181A (en) * | 2009-02-20 | 2010-09-02 | Denso Corp | Fuel injection valve |
| CN105332826A (en) * | 2015-11-27 | 2016-02-17 | 哈尔滨工程大学 | Leakage-free electromagnetic-control fuel gas ejection device |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE10160263A1 (en) * | 2001-12-07 | 2003-06-18 | Bosch Gmbh Robert | Fuel injection device for an internal combustion engine |
| JP4461329B2 (en) * | 2004-08-31 | 2010-05-12 | 旭有機材工業株式会社 | Fluid control device |
-
2019
- 2019-10-15 CN CN201910975670.8A patent/CN112664655B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CH109552A (en) * | 1924-04-22 | 1925-04-01 | Rochefort Francois | Fuel injection device for internal combustion engines. |
| GB598566A (en) * | 1945-05-22 | 1948-02-20 | H M Hobson Aircraft & Motor Co | Improvements in fuel injection systems for internal combustion engines |
| JPH10103192A (en) * | 1996-09-25 | 1998-04-21 | Mitsubishi Heavy Ind Ltd | Two fluid injection valve |
| CN200986026Y (en) * | 2006-12-04 | 2007-12-05 | 苏州有色金属加工研究院 | Air cylinder type roller milling oil injection valve |
| JP2010190181A (en) * | 2009-02-20 | 2010-09-02 | Denso Corp | Fuel injection valve |
| CN105332826A (en) * | 2015-11-27 | 2016-02-17 | 哈尔滨工程大学 | Leakage-free electromagnetic-control fuel gas ejection device |
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| CN112664655A (en) | 2021-04-16 |
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