CN113976630B - Device capable of preheating roller at constant temperature and operation method thereof - Google Patents
Device capable of preheating roller at constant temperature and operation method thereof Download PDFInfo
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- CN113976630B CN113976630B CN202111372170.9A CN202111372170A CN113976630B CN 113976630 B CN113976630 B CN 113976630B CN 202111372170 A CN202111372170 A CN 202111372170A CN 113976630 B CN113976630 B CN 113976630B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B27/00—Rolls, roll alloys or roll fabrication; Lubricating, cooling or heating rolls while in use
- B21B27/06—Lubricating, cooling or heating rolls
- B21B27/10—Lubricating, cooling or heating rolls externally
- B21B27/106—Heating the rolls
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B37/00—Control devices or methods specially adapted for metal-rolling mills or the work produced thereby
- B21B37/46—Roll speed or drive motor control
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B37/00—Control devices or methods specially adapted for metal-rolling mills or the work produced thereby
- B21B37/74—Temperature control, e.g. by cooling or heating the rolls or the product
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B38/00—Methods or devices for measuring, detecting or monitoring specially adapted for metal-rolling mills, e.g. position detection, inspection of the product
- B21B38/006—Methods or devices for measuring, detecting or monitoring specially adapted for metal-rolling mills, e.g. position detection, inspection of the product for measuring temperature
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B38/00—Methods or devices for measuring, detecting or monitoring specially adapted for metal-rolling mills, e.g. position detection, inspection of the product
- B21B38/06—Methods or devices for measuring, detecting or monitoring specially adapted for metal-rolling mills, e.g. position detection, inspection of the product for measuring tension or compression
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
- Y02P70/10—Greenhouse gas [GHG] capture, material saving, heat recovery or other energy efficient measures, e.g. motor control, characterised by manufacturing processes, e.g. for rolling metal or metal working
Abstract
The invention relates to a device capable of preheating a roller at a fixed temperature and an operation method thereof, wherein the device comprises a rolling mill main body, a preheating roller rack, a temperature measuring instrument, a variable frequency power supply and a control system; the rolling mill main body comprises a rolling mill frame, an upper working roll and a lower working roll; the upper working roll and the lower working roll are symmetrically arranged inside the roller frame; the preheating roller frames are respectively and symmetrically arranged on two sides of the working roller; the temperature measuring instruments are respectively arranged on one side of the working roll; the preheating rollers are respectively arranged on the inner end faces of the preheating roller frames close to one end of the working roller and are connected to a variable frequency power supply; the control system is connected with the temperature measuring instrument, the preheating roller frame and the variable frequency power supply. The invention has the functions of heating the roller and detecting the temperature of the roller, can carry out on-line constant-temperature preheating on the working roller, can control the preheating temperature on line, has uniform temperature of the working roller after preheating, has flexibility, can change the position along with different working requirements, and does not occupy the normal rolling space in the non-preheating working state.
Description
Technical Field
The invention relates to the technical field of steel rolling equipment in metallurgical industry, in particular to a device capable of preheating a roller at a constant temperature and an operation method thereof.
Background
Titanium and titanium alloys are widely used in the aerospace industry, the automotive industry, the petroleum and chemical industry and other fields because of their characteristics of high specific strength, high heat resistance, high corrosion resistance, excellent low temperature resistance and the like. But because of the properties of less titanium alloy slippage system, poor plastic deformation capability at room temperature, narrow processing temperature range and the like, the precision rolling of the titanium alloy is difficult. Due to the particularity of the titanium alloy rolling process, the roller must be preheated before the titanium alloy is precisely rolled. Aiming at the problem, different heating means are adopted to preheat the roller at home and abroad successively, and the preheating of the inner expanding fluid, the preheating of flame, the radiation preheating of an external resistance wire cover, the rolling preheating and the like are carried out. The inner fluid preheating is to introduce high-temperature fluid such as heat conduction oil into the roller, and the roller preheating is realized through the heat convection of the high-temperature fluid on the inner wall of the roller; an external resistance wire cover radiation preheating method is characterized in that a heat-insulating cover with a resistance wire is arranged outside a roller, when in preheating, large current is conducted to the resistance wire to enable the resistance wire to generate high temperature, the temperature is transferred to roller flame through thermal radiation to preheat, the flame jet heating is carried out on a rolling mill, and the outer surface of the roller is heated through high-temperature flame; the rolling preheating is mainly that before rolling the titanium alloy rolled piece, a plurality of slabs made of other materials are rolled firstly, and the titanium alloy slabs are rolled after the temperature of the roller is raised to a proper temperature.
The above techniques all have different technical limitations: the inner fluid preheating needs to axially arrange a through hole in the roller, so that the rigidity of the roller is reduced, and the processing cost of the roller is increased; the flame preheating can improve the surface temperature of the roller, but the flame heating temperature is difficult to accurately regulate and control, the surface temperature of the roller is non-uniform, and the environmental pollution caused by the flame heating is not negligible; although the preheating effect of the radiation preheating of the external resistance wire cover is uniform, the heating efficiency is low, and the heat-insulating cover occupies a large amount of space of the rolling mill, so that the rolling process is not facilitated; the rolling preheating is a common preheating method in the current production, but the preheating process is long, the production continuity is poor, and the phenomena of roller bonding and the like are easily generated when a high-temperature plate blank is rolled by a normal-temperature roller, so that the roller consumption of the working roller is increased, and the effective working time of the working roller is reduced. Therefore, the existing roller preheating mode has certain defects and shortcomings, and further lifting and perfecting space is provided.
Disclosure of Invention
In view of the above problems, an object of the present invention is to provide a device and an operation method thereof capable of preheating a roll at a constant temperature, which can perform online preheating at a constant temperature on a work roll, the preheating temperature can be controlled online, the temperature of the work roll after preheating is uniform, the preheating device has flexibility, the position can be changed according to different work requirements, and the non-preheating working state does not occupy a normal rolling space.
The technical scheme adopted by the invention is as follows:
the invention provides a device capable of preheating a roller at a fixed temperature, which comprises a rolling mill main body, a preheating roller rack, a temperature measuring instrument, a variable frequency power supply and a control system, wherein the preheating roller rack is arranged on the preheating roller rack;
the rolling mill main body comprises a rolling mill frame, an upper working roll and a lower working roll; the upper working roll and the lower working roll are symmetrically arranged on the upper side and the lower side of the middle part in the roll stand;
the preheating roller frames are respectively and symmetrically arranged on the left side and the right side of the upper working roller and the left side and the right side of the lower working roller; the tops of the preheating roller frames on the two sides of the upper working roller are hinged with the middle part of the lower surface of the top end of the roller frame, and the inner end surface of the bottom is rotatably connected with three preheating rollers; the bottoms of the preheating roller frames on the two sides of the lower working roller are hinged with the middle part of the upper surface of the bottom end of the roller frame, and the inner end surface of the top is rotatably connected with three preheating rollers; the preheating roller frame can realize two working postures of lifting or putting down, and when the preheating roller frame is in a non-preheating state, the preheating roller frames on the upper side and the lower side are lifted and respectively in parking postures close to the upper side and the lower side of the roller frame; when in a preheating state, the preheating roller frames on the upper side and the lower side are put down and are respectively contacted with the upper working roller and the lower working roller through the preheating rollers; the variable frequency power supply is respectively connected with each preheating roller;
the temperature measuring instruments are respectively arranged on one sides of the upper working roll and the lower working roll, respectively detect the surfaces of the rolls, transmit detected temperature signals to the control system, the control system calculates the preheating temperature of the rolls according to the temperature signals, and when the preheating temperature reaches a preset value, the variable frequency power supply stops electrifying.
Further, the preheating roller frame comprises a preheating roller frame, a front hydraulic push rod connecting piece, a front hydraulic push rod, a front supporting arm, a rear hydraulic push rod, a rear supporting arm, a first pin shaft, a second pin shaft, a third pin shaft, a fourth pin shaft, a front supporting arm connecting piece, a fifth pin shaft, a sixth pin shaft, a seventh pin shaft, a first preheating roller bearing, a pressure sensor, a second preheating roller bearing and a third preheating roller bearing; one end of the rear supporting arm is fixedly arranged on the roller frame, and the other end of the rear supporting arm is welded with a sleeve; the middle upper part of the front supporting arm is matched with a sleeve of the rear supporting arm through a third pin shaft to form a revolute pair; the rear hydraulic push rod is positioned above the rear supporting arm, a hydraulic cylinder of the rear hydraulic push rod is connected with the roller frame, and the front end of the push rod is provided with a sleeve which can form a revolute pair with a first pin shaft and is connected to the inner side of one end of the front supporting arm through the first pin shaft; the front support arm connecting pieces are arranged on two sides of the middle lower part of the front support arm, and the front support arm is connected with a revolute pair at one end of the front support arm connecting piece on the two sides through a fourth pin shaft; the hydraulic cylinder of the front hydraulic push rod is connected with the outer side of one end of the front support arm through a second pin shaft to form a revolute pair; the front end of the front hydraulic push rod is welded with a sleeve, front hydraulic push rod connecting pieces are arranged on two sides of the front hydraulic push rod, and one end of each front hydraulic push rod connecting piece and the other end of each front support arm connecting piece are connected with the front end sleeve of the front hydraulic push rod together through a fifth pin shaft; two hinge mounting walls are symmetrically processed on the outer surface of the preheating roller frame, each mounting wall is correspondingly provided with two hinge mounting holes for mounting a pin shaft, and the other end of the front hydraulic push rod connecting piece is connected into the mounting hole on the outer side of the hinge mounting wall through a seventh pin shaft; the other end of the front supporting arm is connected into a mounting hole in the inner side of the hinge mounting wall through a sixth pin shaft;
the pressure sensor is arranged in a bearing seat of the preheating roller and used for detecting the pressure applied to the preheating roller and feeding back a pressure index to the control system; the first preheating roller bearing, the second preheating roller bearing and the third preheating roller bearing are uniformly arranged on the left side and the right side of the preheating roller frame in pairs along the arc-shaped contour of the preheating roller frame; the three preheating rollers are respectively connected with the preheating roller frame in a rotating mode through a first preheating roller bearing, a second preheating roller bearing and a third preheating roller bearing.
Further, the preheating roller frame is of an arc-shaped structure corresponding to the upper working roller and the lower working roller.
Further, the rotation of the preheating roller in the working process is realized through the friction between the preheating roller and the upper working roller and the lower working roller.
Furthermore, the preheating roller is an electromagnetic heating roller, an axial through hole is formed in the preheating roller, a roller core wound with a multi-turn coil is installed in the axial through hole, the coil is connected with an external variable frequency power supply through a conductive sliding ring, and the external variable frequency power supply supplies power independently and can be independently regulated and controlled.
A method of operating an apparatus for the constant temperature preheating of rolls, said method comprising the steps of:
step 1, calculating preheating temperature and preheating pressure of a working roller and a preheating roller according to the material of a plate to be rolled and the rolling process requirement; calculating output parameters of the variable frequency power supply; selecting proper rotating speed of the working roll in the preheating process;
step 9, in the preheating process, observing whether the surface of the working roll has obvious indentation, scratch and adhesion, if the defects exist, stopping preheating, and checking whether the preheating roll frame has the problems of looseness, inclination and the like; if no defect appears, continuing heating;
step 10, after the temperature measuring instrument detects that the surface of the working roll reaches a preset temperature, the control system cuts off the variable frequency power supply, and the preheating roll stops heating;
step 11, the control system controls the front hydraulic push rod to be retracted to drive the preheating roller frame to be adjusted to a non-working angle; the rear hydraulic push rod is retracted to drive the front support arm to move, the preheating roller is moved to a non-preheating working position, and normal rolling work can be carried out after preheating work is finished.
Compared with the prior art, the invention has the following beneficial effects:
1. compared with a rolling preheating mode, the method has the advantages that the traditional high-temperature rolled steel plate is replaced by a four-group preheating roller heating mode, the heating area is increased, the preheating rollers have active heating capacity compared with a cold rolled steel plate, the heating speed is obviously increased, and the material cost and the fuel cost are saved.
2. The preheating roller and the working roller have the characteristic of self-matching speed, the sliding friction between the electromagnetic heating roller and the working roller is reduced, the working roller only generates little abrasion in the preheating process, and the effective working time of the roller in one roller changing period can be effectively prolonged.
3. The invention adopts the axial through hole to install the electromagnetic heating roller wound by the right multi-turn coil iron core, the temperature generated by the coil passes through the outer layer of the electromagnetic heating roller, and the temperature is equalized in the axial direction, so that the working roller is preheated in such a way, the temperature of the working roller is more uniform in the axial direction, and the adverse effect of the thermal convexity of the roller on the plate shape caused by uneven temperature is avoided.
4. The preheating rack has flexibility, and can be stopped at the upper side and the lower side of the rolling mill in a non-preheating state, so that the rolling space of the rolling mill is not occupied.
Drawings
FIG. 1 is a schematic view of the overall structure of the present invention;
FIG. 2 is a schematic structural view of a preheating roller frame in FIG. 1;
fig. 3 is a schematic structural view of the preheating roll of fig. 1.
Wherein, the reference numbers: 1-a roll stand; 2-upper working roll; 3-lower working roll; 4-preheating roller frame; 5-preheating rollers; 6-a temperature measuring instrument; 7-a variable frequency power supply; 8-a control system; 41-preheating roller frame; 42-front hydraulic push rod connection; 43-front hydraulic push rod; 44-front support arm; 45-rear hydraulic push rod; 46-rear support arm; 47-a first pin; 48-a second pin; 49-a third pin; 410-a fourth pin; 411-front support arm attachment; 412-fifth pin; 413-a sixth pin; 414-seventh hinge pin; 415-a first pre-heat roller bearing; 416-a pressure sensor; 417 — second pre-heat roller bearing; 418-third preheat roller bearing; 419-hinge mounting wall; 51-a coil; 52-roll core; 53-conductive slip rings.
Detailed Description
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
It should be noted that in the description of the present invention, the terms "upper", "lower", "top", "bottom", "one side", "the other side", "left", "right", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of describing the present invention and simplifying the description, but do not mean that a device or an element must have a specific orientation, be configured and operated in a specific orientation.
Referring to fig. 1 to 3, a specific structure of an embodiment of the device for constant-temperature preheating of a roller according to the present invention is shown. The device comprises a rolling mill main body, a preheating roll rack 4, a preheating roll 5, a temperature measuring instrument 6, a variable frequency power supply 7 and a control system 8.
The rolling mill main body comprises a rolling mill frame 1, an upper working roll 2 and a lower working roll 3; the upper working roll 2 and the lower working roll 3 are symmetrically arranged on the upper side and the lower side of the middle part in the roll stand.
Preheating roll frames 4 are symmetrically arranged on the left side and the right side of the upper working roll 2; preheating roller frames 4 are symmetrically arranged on the left side and the right side of the lower working roller 3; the preheating roll frames 4 on the two sides of the upper working roll 2 and the preheating roll frames 4 on the two sides of the lower working roll 3 are symmetrical to each other; the tops of preheating roll frames 4 on two sides of the upper working roll 2 are hinged with the middle part of the lower surface of the top end of the roll frame 1, and the inner end surface of the bottom is rotatably connected with three preheating rolls 5; the bottoms of the preheating roller frames 4 on two sides of the lower working roller 3 are hinged with the middle part of the upper surface of the bottom end of the roller frame 1, and the inner end surface of the top part is rotatably connected with three preheating rollers 5; the preheating roll frames 4 can be lifted or put down in two working postures, and when the preheating roll frames 4 are not in a preheating state, the preheating roll frames 4 on the upper side and the lower side are lifted and respectively in parking postures close to the upper side and the lower side of the roll frame 1; in a preheating state, the preheating roller frames 4 on the upper side and the lower side are put down and are respectively contacted with the upper working roller 2 and the lower working roller 3 through the preheating rollers 5; the preheating rollers 5 are all electromagnetic heating rollers, axial through holes are formed in the rollers, a roller core 52 wound with a multi-turn coil 51 is arranged in each axial through hole, the coil 51 is connected with an external variable frequency power supply 7 through a conductive sliding ring 53 at the end part of each preheating roller, the external variable frequency power supply 7 supplies power independently, and independent regulation and control can be realized.
The temperature measuring instruments 6 are respectively arranged on one sides of the upper working roll 2 and the lower working roll 3, respectively detect the surfaces of the rolls, transmit detected temperature signals to the control system 8, the control system 8 calculates the preheating temperature of the rolls according to the temperature signals, when the preheating temperature reaches a preset value, the variable frequency power supply stops being electrified, and the preheating roll frame 4 restores to a non-preheating working posture.
The preheating roller frames 4 on the left side and the right side of the upper working roller 2 are identical in structure and are symmetrical left and right; the preheating roller frames 4 on the left side and the right side of the lower working roller 3 are in bilateral symmetry; the preheating roll frames 4 on the left and right sides of the upper working roll 2 and the preheating roll frames 4 on the left and right sides of the lower working roll 3 are identical in structure and are arranged in a vertically symmetrical mode. The preheating roll frame 4 on the left side of the working roll 2 is explained below as an example:
the preheating roller frame 4 comprises a preheating roller frame 41, a front hydraulic push rod connecting piece 42, a front hydraulic push rod 43, a front supporting arm 44, a rear hydraulic push rod 45, a rear supporting arm 46, a first pin shaft 47, a second pin shaft 48, a third pin shaft 49, a fourth pin shaft 410, a front supporting arm connecting piece 411, a fifth pin shaft 412, a sixth pin shaft 413, a seventh pin shaft 414, a first preheating roller bearing 415, a pressure sensor 416, a second preheating roller bearing 417, a third preheating roller bearing 418 and a hinge mounting wall 419.
One end of the rear supporting arm 46 is fixedly arranged on a bulge in the middle of the lower surface of the top end of the roller frame 1, and the other end of the rear supporting arm is welded with a sleeve; the middle upper part of the front supporting arm 44 is matched with the sleeve of the rear supporting arm 46 through a third pin shaft 49 to form a revolute pair; the rear hydraulic push rod 45 is positioned above the rear supporting arm 46, the hydraulic cylinder end of the rear hydraulic push rod is convexly connected with the middle part of the lower surface of the top end of the roller rack 1, the front end of the push rod is provided with a sleeve, a revolute pair is formed by the sleeve and a first pin shaft 47, and the revolute pair is connected with the right side of the upper end of the front supporting arm 44 through the first pin shaft 47; when the rear hydraulic rod 45 is extended, the front support arm 44 is caused to perform a rotational movement about the revolute pair of the third pin 49 of the rear support arm 46. The front support arm connecting pieces 411 are arranged at the front side and the rear side of the middle lower part of the front support arm 44, and the middle lower part of the front support arm 44 is connected with the right end revolute pair of the front support arm connecting pieces 411 at the two sides through a fourth pin shaft 410; the hydraulic cylinder end of the front hydraulic push rod 43 is connected with the left side of the upper end of the front support arm 44 through a second pin shaft 48 to form a revolute pair; a sleeve is welded at the push rod end of the front hydraulic push rod 43, front hydraulic push rod connecting pieces 42 are arranged on two sides of the sleeve, and the upper end of each front hydraulic push rod connecting piece 42 and the left end of each front support arm connecting piece 411 are connected with the front end sleeve of the front hydraulic push rod 43 through a fifth pin shaft 412; two hinge mounting walls 419 are symmetrically processed on the outer surface of the preheating roller frame 41, two corresponding hinge mounting holes are formed in the left side and the right side of each mounting wall and used for mounting a pin shaft, and the lower end of the front hydraulic push rod connecting piece 42 is connected into the mounting hole in the left side of the hinge mounting wall 419 through a seventh pin shaft 414; the lower end of the front support arm 44 is connected to a mounting hole on the right side of the hinge mounting wall 419 by a sixth pin 413. When the front hydraulic push rod 43 extends out, the front support arm connecting member 411 is driven to rotate around the fourth pin 410, and the preheating roller frame 41 is driven to rotate around the sixth pin 413. The movement of the preheating roller frame 41 is matched with the movement of the front support arm 44, so that the movement of the preheating roller frame 41 such as the integral ascending or descending or the angle adjustment is realized.
The pressure sensors 416 are arranged in the bearing seats of the preheating rollers and are used for detecting the pressure on the preheating rollers 5 and feeding back pressure signals to the control system 8, the control system 8 processes pressure signals, analyzes the pressure between the preheating rollers 5 and the working rollers, controls the hydraulic systems of the two groups of hydraulic push rods in the preheating roller rack 4 and adjusts the pressure between the preheating rollers 5 and the upper working roller 2 or the lower working roller 3; the preheating roller frame 41 is of an arc-shaped structure corresponding to the upper working roller 2 and the lower working roller 3; the first preheating roller bearing 415, the second preheating roller bearing 417 and the third preheating roller bearing 418 are uniformly arranged on the left side and the right side of the preheating roller frame 41 in pairs along the arc-shaped contour of the preheating roller frame 41; the three preheating rollers 5 are respectively rotatably connected with the preheating roller frame 41 through a first preheating roller bearing 415, a second preheating roller bearing 417 and a third preheating roller bearing 418, namely the arrangement of the three preheating rollers 5 corresponds to the outer arc lines of the upper working roller 2 and the lower working roller 3 and is parallel to the upper working roller 2 and the lower working roller 3; the preheating roller 5 is only arranged on the preheating roller frame 41 through a bearing and is not independently arranged and driven, and the rotation in the working process is realized through the friction between the preheating roller and the upper working roller 2 and between the preheating roller and the lower working roller 3.
The preheating roller frame 41 can be lifted up and put down, and two postures of the preheating roller frame can be realized according to working requirements:
(1) When the preheating roller is in a non-preheating state, the front arm hydraulic cylinder of the preheating roller retracts, the movement is transmitted to the preheating roller frame 41 through the front hydraulic push rod connecting piece 42, the front hydraulic push rod 43 and the front supporting arm 44, the angle of the preheating roller frame 41 is adjusted, and the angle is controlled to be a non-working angle; the preheating roller rear arm hydraulic cylinder retracts, the front support arm 44 is controlled to lift up through the rear support arm 46 and the rear hydraulic push rod 45, and the preheating roller frame 41 is in a parking posture close to the roller frame 1;
(2) In a preheating state, the front arm hydraulic cylinder of the preheating roller extends out, the movement is transmitted to the preheating roller frame 41 through the front hydraulic push rod connecting piece 42, the front hydraulic push rod 43 and the front support arm 44, the angle of the preheating roller frame 41 is adjusted, and the angle is controlled to be a working angle; the preheating roller rear arm hydraulic cylinder extends out, the front support arm 44 is controlled to be put down through the rear support arm 46 and the rear hydraulic push rod 45, and the preheating roller frame 41 is in a working state.
The following three heating modes can be used according to the actually set preheating temperature during the preheating operation:
the single preheating roller works, and when the required power of the preheating temperature is below 30 percent of the maximum power, only the second preheating roller 5 is electrified to work;
the double preheating rollers work, and when the preset temperature required power is between 30% and 60% of the maximum power, the first preheating roller 5 and the third preheating roller 5 are electrified and work simultaneously;
the three preheating rollers work, and when the preheating temperature is higher and the heating power requirement is more than 60% of the maximum heating power, the three preheating rollers 5 are electrified to work simultaneously.
A method of operating an apparatus for the constant temperature preheating of rolls, said method comprising the steps of:
step 1, calculating the preheating temperature according to the material of the plate to be rolled and the rolling process requirement, and calculating the preheating pressure of a working roller and a preheating roller 5; calculating the output parameters of the variable frequency power supply 7; selecting proper rotating speed of the working roll in the preheating process;
step 9, in the preheating process, observing whether the surface of the working roll has obvious indentation, scratch and adhesion, if the defects exist, stopping preheating, and checking whether the preheating roll frame 4 has the problems of looseness, inclination and the like; if no defect occurs, continuing heating;
step 10, after the thermodetector 6 detects that the surface of the working roll reaches a preset temperature, the control system 8 cuts off the variable frequency power supply 7, and the preheating roll 5 stops heating;
step 11, the control system 8 controls the front hydraulic push rod 43 to retract to drive the preheating roller frame 41 to adjust to a non-working angle; the rear hydraulic push rod 45 retracts to drive the front support arm 44 to move, the preheating roller 5 is moved to a non-preheating working position, and normal rolling work can be carried out after preheating work is finished.
The above-mentioned embodiments are merely illustrative of the preferred embodiments of the present invention, and do not limit the scope of the present invention, and various modifications and improvements of the technical solution of the present invention by those skilled in the art should fall within the protection scope defined by the claims of the present invention without departing from the spirit of the present invention.
Claims (5)
1. The utility model provides a device to roller constant temperature preheating which characterized in that: the device comprises a rolling mill main body, a preheating roll rack, a temperature measuring instrument, a variable frequency power supply and a control system;
the rolling mill main body comprises a rolling mill frame, an upper working roll and a lower working roll; the upper working roll and the lower working roll are symmetrically arranged on the upper side and the lower side of the middle part in the roll stand;
the preheating roller frames are respectively and symmetrically arranged on the left side and the right side of the upper working roller and the left side and the right side of the lower working roller; the tops of the preheating roller frames on the two sides of the upper working roller are hinged with the middle part of the lower surface of the top end of the roller frame, and the inner end surface of the bottom is rotatably connected with three preheating rollers; the bottoms of the preheating roller frames on the two sides of the lower working roller are hinged with the middle part of the upper surface of the bottom end of the roller frame, and the inner end surface of the top is rotatably connected with three preheating rollers; the preheating roller frame can realize two working postures of lifting or putting down, and when the preheating roller frame is in a non-preheating state, the preheating roller frames on the upper side and the lower side are lifted and respectively in parking postures close to the upper side and the lower side of the roller frame; when in a preheating state, the preheating roller frames on the upper side and the lower side are put down and are respectively contacted with the upper working roller and the lower working roller through the preheating rollers; the variable frequency power supply is respectively connected with the preheating rollers;
the temperature measuring instruments are respectively arranged on one sides of the upper working roll and the lower working roll, respectively detect the surfaces of the rolls, transmit detected temperature signals to the control system, the control system calculates the preheating temperature of the rolls according to the temperature signals, and when the preheating temperature reaches a preset value, the variable frequency power supply stops electrifying;
the preheating roller frame comprises a preheating roller frame, a front hydraulic push rod connecting piece, a front hydraulic push rod, a front supporting arm, a rear hydraulic push rod, a rear supporting arm, a first pin shaft, a second pin shaft, a third pin shaft, a fourth pin shaft, a front supporting arm connecting piece, a fifth pin shaft, a sixth pin shaft, a seventh pin shaft, a first preheating roller bearing, a pressure sensor, a second preheating roller bearing and a third preheating roller bearing; one end of the rear supporting arm is fixedly arranged on the roller frame, and the other end of the rear supporting arm is welded with a sleeve; the middle upper part of the front supporting arm is matched with a sleeve of the rear supporting arm through a third pin shaft to form a revolute pair; the rear hydraulic push rod is positioned above the rear supporting arm, a hydraulic cylinder of the rear hydraulic push rod is connected with the roller frame, and the front end of the push rod is provided with a sleeve which can form a revolute pair with a first pin shaft and is connected to the inner side of one end of the front supporting arm through the first pin shaft; the front support arm connecting pieces are arranged on two sides of the middle lower part of the front support arm, and the front support arm is connected with a revolute pair at one end of each front support arm connecting piece on the two sides through a fourth pin shaft; the hydraulic cylinder of the front hydraulic push rod is connected with the outer side of one end of the front support arm through a second pin shaft to form a revolute pair; the front end of the front hydraulic push rod is welded with a sleeve, front hydraulic push rod connecting pieces are arranged on two sides of the front hydraulic push rod, and one end of each front hydraulic push rod connecting piece and the other end of each front supporting arm connecting piece are connected with the front end sleeve of the front hydraulic push rod together through a fifth pin shaft; two hinge mounting arms are symmetrically processed on the outer surface of the preheating roller frame, each mounting arm is correspondingly provided with two hinge mounting holes for mounting a pin shaft, and the other end of the front hydraulic push rod connecting piece is connected into the mounting hole on the outer side of each hinge mounting arm through a seventh pin shaft; the other end of the front support arm is connected to a mounting hole in the inner side of the hinge mounting arm through a sixth pin shaft;
the pressure sensor is arranged in a bearing seat of the preheating roller and used for detecting the pressure applied to the preheating roller and feeding back a pressure signal to the control system; the first preheating roller bearing, the second preheating roller bearing and the third preheating roller bearing are uniformly arranged on the left side and the right side of the preheating roller frame in pairs along the arc-shaped contour of the preheating roller frame; the three preheating rollers are respectively connected with the preheating roller frame in a rotating mode through a first preheating roller bearing, a second preheating roller bearing and a third preheating roller bearing.
2. The device for preheating the rollers at a constant temperature according to claim 1, wherein: the preheating roller frame is of an arc-shaped structure corresponding to the upper working roller and the lower working roller.
3. The device for preheating the rollers at a constant temperature according to claim 1, wherein: the rotation of the preheating roller in the working process is realized by the friction between the preheating roller and the upper working roller or the lower working roller.
4. The device for preheating the rollers at a constant temperature according to claim 1, wherein: the preheating roller is an electromagnetic heating roller, an axial through hole is formed in the preheating roller, a roller core wound with a multi-turn coil is installed in the axial through hole, the coil is connected with an external variable frequency power supply through a conductive sliding ring, and the external variable frequency power supply supplies power independently and can be independently regulated and controlled.
5. A method of operating a device for the constant-temperature preheating of rolling rolls according to claim 2, characterized in that it comprises the following steps:
step 1, calculating preheating temperature and preheating pressure of a working roller and a preheating roller according to the material of a plate to be rolled and the rolling process requirement; calculating output parameters of the variable frequency power supply; selecting proper rotating speed of the working roll in the preheating process;
step 2, checking whether the preheating roller frame is in a normal state; the working roll idles for two circles to check whether the working roll is in a normal state; detecting whether the readings of the pressure sensors are normal or not, and if all the mechanisms are in normal states, preheating the working roll;
step 3, starting a control system, wherein the control system controls a front hydraulic push rod of the preheating roller to extend out to drive a preheating roller frame to adjust to a proper angle; then the hydraulic push rod extends out to drive the front support arm to move, and the three preheating rollers are moved to preset preheating working positions;
step 4, the pressure sensor acquires pressure data received by the preheating roller and feeds the pressure data back to the control system, the control system calculates a pressure value between the preheating roller and the working roller according to the feedback data, adjusts an output value of the hydraulic system according to a difference between a preset pressure value and an actual pressure value, and changes the pressure of the preheating roller and the working roller to enable the preheating roller and the working roller to reach the preset pressure;
step 5, starting a thermodetector, checking whether the readings are normal and stable, resetting, and preparing to start detection;
step 6, starting the variable frequency power supply to electrify the preheating roller, observing whether a power supply circuit is normal, if the power supply voltage fluctuates severely, turning off the variable frequency power supply, and checking whether the circuit and the variable frequency power supply are damaged; if the circuit is normal, preheating operation is started;
step 7, starting the working roller, driving the preheating roller to rotate and starting preheating;
step 8, detecting the surface temperature of the working roll in real time in the preheating process by using a temperature measuring instrument;
step 9, in the preheating process, observing whether the surface of the working roll has obvious indentation, scratch and adhesion, if the defects appear, stopping preheating, and checking whether the frame of the preheating roll has the problems of looseness, inclination and the like; if no defect occurs, continuing heating;
step 10, after the temperature measuring instrument detects that the surface of the working roll reaches a preset temperature, the control system cuts off the variable frequency power supply, and the preheating roll stops heating;
step 11, the control system controls the front hydraulic push rod to be retracted to drive the preheating roller frame to be adjusted to a non-working angle; the rear hydraulic push rod is retracted to drive the front support arm to move, the preheating roller is moved to a non-preheating working position, and normal rolling work can be carried out after preheating work is finished.
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| CN114535299A (en) * | 2022-01-29 | 2022-05-27 | 太原理工大学 | Posture-variable roller heating system for rolling of difficult-to-deform alloy |
| CN116329284B (en) * | 2023-05-15 | 2023-11-03 | 张家港扬子江冷轧板有限公司 | Roller preheating device |
| CN116765137B (en) * | 2023-08-22 | 2023-11-10 | 绵阳双辉金属科技有限公司 | Steel sheet calendering roller temperature control system that adjusts temperature fast |
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| KR101149194B1 (en) * | 2009-06-26 | 2012-05-24 | 현대제철 주식회사 | Preheating Apparatus for Roll |
| CN201676875U (en) * | 2010-04-26 | 2010-12-22 | 广州先艺电子科技有限公司 | Small hot mill |
| CN203108934U (en) * | 2013-03-08 | 2013-08-07 | 上海西重所重型机械成套有限公司 | Roller on-line heating device |
| CN103240275B (en) * | 2013-05-14 | 2014-05-07 | 吉林大学 | On-line heating device and heating method of magnesium alloy sheet warm rolling rollers |
| CN103658189A (en) * | 2013-11-16 | 2014-03-26 | 中国重型机械研究院股份公司 | Device for on-line roller heating and temperature controlling for warm-rolling mill |
| CN105521996B (en) * | 2016-02-04 | 2018-02-02 | 东北大学 | A kind of magnesium alloy strip hot-rolling heating rolling device and method |
| CN206567328U (en) * | 2017-03-08 | 2017-10-20 | 南京万基彩钢钢制品有限公司 | A kind of hot-rolling mill |
| CN206783993U (en) * | 2017-06-13 | 2017-12-22 | 佛山智造工业设计有限公司 | A kind of heater for producing PVC artificial leather |
| CN207592437U (en) * | 2017-12-17 | 2018-07-10 | 邯郸市正华金属加工有限公司 | One kind is used to breathe out fragrant slot production hot-rolling mill |
| CN210026228U (en) * | 2019-04-09 | 2020-02-07 | 山东瑞德管业有限公司 | Pipe clamping device in PVC pipe production line |
| CN111842497A (en) * | 2020-07-21 | 2020-10-30 | 山西盛镁科技有限公司 | Contact type on-line heating constant-temperature rolling system for metal plate strip and rolling process thereof |
| CN112497605A (en) * | 2020-11-17 | 2021-03-16 | 益阳市思创传动部件制造有限公司 | Rubber roller heating plasticity forming machine |
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