Correcting treatment device and method for hot-rolled elliptical coil

Abstract

The invention discloses a correction treatment device and method for a hot-rolled elliptical coil. The correction treatment device comprises a heating part, an extruding part and an expanding part, the number of the heating parts is two, and the heating parts are symmetrically arranged on the two sides of the extrusion part. The expansion part is arranged on one side of the heating part; the expanding part comprises a lifting mechanism, a pushing mechanism and an expanding mechanism; the pushing mechanism is arranged on the lifting mechanism; and the expansion mechanism is arranged on the pushing mechanism. According to the method, the elliptically deformed strip steel is effectively corrected.

Description

Technical Field

[0001] The present invention relates to a device and method for correcting a hot-rolled elliptical coil, in particular to a device and method for correcting an elliptical steel coil, belonging to the technical field of correction equipment for hot-rolled elliptical steel coils. Background Art

[0002] Due to the different cooling and storage methods, hot-rolled strip often has elliptical defects during the coiling and storage stages. The main reasons for the elliptical shape of the steel coil include the combined effects of organizational transformation, phase change expansion, interlayer dislocation, internal thermal stress and bainite transformation. During the production process of hot-rolled strip, as the temperature of the strip decreases, phase change will occur, resulting in a corresponding increase in the volume of the strip, which then expands, and the expansion affects the organizational structure of the hot-rolled strip. During the coiling process of hot-rolled strip, due to the inconsistent temperature distribution inside and outside the steel coil, there are differences in the phase change speed and expansion degree inside and outside the steel coil. This difference causes interlayer dislocation of the steel coil, destroys the stability of the steel coil, and ultimately causes the steel coil to lose its own weight. The steel coil is deformed under the action of the bainite transformation, and an elliptical deformation occurs. At the same time, during the storage process, the temperature of the outer ring of the steel coil drops the fastest, and first drops to the phase transformation point to undergo phase transformation expansion, which aggravates the expansion tendency. In particular, during the cooling process of hot-rolled high-strength steel, due to the high coiling temperature, which is usually controlled at 660℃~700℃, the transformation time from austenite to ferrite or pearlite is relatively long, which is equivalent to isothermal transformation. The volume expansion caused by the phase transformation changes smoothly, and the elliptical problem is not prominent. However, when entering the bainite transformation zone, the bainite transformation that occurs in a short time will produce a large volume expansion, and the expansion amount between layers is different, which is prone to elliptical deformation under the action of its own weight. There are multiple risk factors in the transportation of elliptical steel coils, which are mainly reflected in loading and unloading. The process is complicated, the transportation risks are high, and the loading and fixing operations are complicated, which may cause traffic accidents or casualties. First, due to its special shape and weight, the loading and unloading process is very troublesome and requires professional lifting tools and skills. Otherwise, the center of gravity of the truck may be affected during loading, and even cause rollover or tire burst. Secondly, during transportation, the steel coils need to be properly loaded and fixed to ensure safety and stability. However, due to the special shape of the steel coils, the loading and fixing operations are relatively complicated. If the loading and fixing are improper, the steel coils may slide, overturn or fall off during transportation, causing traffic accidents or casualties. The problem of oval steel coils is particularly obvious in the use of downstream customers. , so that the downstream unit cannot put the elliptical steel coil into the reel for direct production; the inner ring can be cut off for slight elliptical coils, but if the inner ring is cut off for severe elliptical coils, not only the inner diameter is too large, the steel coil and the reel are not synchronized, and normal production cannot be achieved, so it can only be re-judged and processed, and a large amount of cutting waste is caused, which affects the yield rate; in addition, during the production process of the downstream unit, the elliptical coil has different diameters in all directions and inconsistent circumferential speeds, which can easily cause scratches on the surface of the steel coil, bringing a series of problems to production costs, order fulfillment, and product quality; at present, one idea to solve the above problems is to reduce the expansion during the coiling process of hot-rolled strip steel, for example, Chinese patent CN202211209367.5 discloses a flexible control method for failure of hot rolled steel strip flat coil, which mainly evaluates the flat coil condition of the steel grade, calculates or measures the Ar3 temperature in the phase change temperature of the steel grade, obtains the isothermal transformation law of austenite, cools the hot rolled steel strip by a segmented cooling method, rapidly cools the hot rolled steel strip to ferrite, pearlite or bainite by a front-stage rapid cooling method, calculates the austenite phase transformation rate when the hot rolled steel strip reaches the coiler reel, increases the austenite phase transformation rate by adjusting the process parameters, and performs a logical judgment of the austenite phase transformation rate; however, this method can only be evaluated by rolling simulation, and in the actual rolling process, the temperature of the steel strip is The degree is changing all the time, and the cooling rates in the length direction and thickness direction are different, so it is impossible to quickly obtain accurate phase change data; Chinese patent CN202122074268.8 discloses a component structure for preventing hot-rolled steel strip from flattening, which mainly includes a saddle, a clamping assembly, a coil transport vehicle, a grating detection unit and a control unit; the coil transport vehicle is located in the gap of the saddle, and the cylinder pushes the fan-shaped block of the clamping assembly toward the steel coil, and according to the detection data of the grating detection unit, the control unit is used to squeeze the steel coil; Chinese patent CN201010233029.6 discloses a coiling method for preventing hot-rolled steel strip from flattening, which includes a first stage The first stage: the strip is rolled out from the finishing mill and enters the coiler after laminar cooling, and the coiling temperature is 500℃~600℃; the second stage: the coiled steel coil stays on the coiler drum for 20s~60s; Chinese patent CN202210305753.8 discloses a method for controlling hot-rolled strip flat coils, including a steel coil shaping and cooling process, the steel coil after the strip coiling process enters the steel coil shaping and cooling process, and the steel coil whose test results do not meet the requirements is shaped until the steel coil meets the size requirements, and then spray cooling is performed to shape; the steel coil whose test results meet the requirements is directly sprayed and cooled to shape; the above inventions are obtained by controlling the cooling method Different coiling temperatures are set, and the shape of the steel coil is controlled before the steel coil is put into storage to prevent the appearance of oval coils; however, it does not mention the oval coils caused by the storage method after the steel coil is put into storage, such as its own gravity, high stacking, etc., and some steel types with relatively delayed phase change, which produce ovals due to phase change during the storage stage. The correction and treatment of such oval coils are not involved, and no corresponding solutions are given; therefore, how to correct the coil shape for the oval coils put into storage is an urgent problem to be solved at present, so that such oval coils can be used normally to improve the yield rate of hot rolling mills and downstream manufacturers; corresponding correction and treatment devices and methods are needed. . Summary of the invention

[0003] The purpose of the present invention is to overcome the shortcomings of the prior art and provide a device and method for correcting hot-rolled elliptical coils, which can effectively correct elliptical deformed strip steel.

[0004] The problem described in the present invention is solved by the following technical solutions: A correction processing device for hot-rolled elliptical coils comprises a heating part, an extrusion part and an expansion part; the number of the heating parts is two, and they are symmetrically arranged on both sides of the extrusion part; the expansion part is arranged on one side of the heating part; the expansion part comprises a lifting mechanism, a pushing mechanism and an expansion mechanism; the pushing mechanism is arranged on the lifting mechanism; the expansion mechanism is arranged on the pushing mechanism.

[0005] The above-mentioned correction processing device for hot-rolled elliptical coils, the lifting mechanism includes a base, a first slide rail, a first electric cylinder and a lifting plate; the first slide rail is arranged on the ground, and the base is slidably arranged on the first slide rail; a hole is arranged at the center of the top end surface of the base, and the first electric cylinder is arranged in the hole of the top end surface of the base, and the end of the piston rod of the first electric cylinder is connected to the center of the bottom end surface of the lifting plate; a guide rod is arranged on the bottom end surface of the lifting plate, and a guide hole is arranged at the top end of the base, and the guide rod is inserted into the guide hole of the base.

[0006] The above-mentioned correction processing device for hot-rolled elliptical coils, the pushing mechanism includes a horizontal cylinder, a hydraulic cylinder, a push column, a push rod and a disc; the shell of the horizontal cylinder is arranged on the top end surface of the lifting plate through a bracket; the hydraulic cylinder shell is arranged at one end of the horizontal cylinder; the push column is arranged in the horizontal cylinder, and its length is less than the length of the horizontal cylinder; the end of the hydraulic cylinder piston rod is connected to the end of the push column; the disc is arranged on the inner wall of the horizontal cylinder; the push rod is arranged on the end surface of the push column away from the hydraulic cylinder, the disc has a hole in the center, and the push rod passes through the center hole of the disc.

[0007] The above-mentioned correction processing device for hot-rolled elliptical coils, the expansion mechanism includes a plurality of expansion members, and each expansion member is circumferentially symmetrically arranged on the outer wall of the horizontal cylinder; the expansion member includes an arc-shaped expansion plate, a strip groove, a guide plate, a first hinge rod and a second hinge rod; the strip groove is arranged on the outer wall of the horizontal cylinder, and it connects the inner and outer walls of the horizontal cylinder, and the length direction of the strip groove is parallel to the axial center line direction of the horizontal cylinder; the disc is located at the center position of the strip groove; the arc-shaped expansion plate covers the outer wall of the horizontal cylinder, and it is located outside the strip groove; the bottom end surface of the arc-shaped expansion plate is provided with a first upper hinge seat and a second upper hinge seat; the outer wall of the push rod is provided with a first lower hinge seat and The second lower hinge seat; the top end of the first hinge rod is hingedly connected to the first upper hinge seat, and the bottom end of the first hinge rod is hingedly connected to the first lower hinge seat; the top end of the second hinge rod is hingedly connected to the second upper hinge seat, and the bottom end of the second hinge rod is hingedly connected to the second lower hinge seat; the first upper hinge seat, the first lower hinge seat and the first hinge rod are located on the same side of the disc, and the second upper hinge seat, the second lower hinge seat and the second hinge rod are located on the other side of the disc; the first upper hinge seat and the second upper hinge seat are both located in the strip groove; a guide plate is provided at the center of the inner side wall of the arc expansion plate, a guide hole is provided on the circumferential side wall of the disc, and the guide plate is inserted in the guide hole of the disc.

[0008] The above-mentioned hot-rolled elliptical coil correction processing device, the extrusion part includes a lifting and lowering mechanism, a lower extrusion piece and an upper extrusion piece; the number of the lifting and lowering mechanisms is two, and they are arranged opposite to each other on the ground; the lower extrusion piece and the upper extrusion piece are both arranged between the lifting and lowering mechanisms on both sides.

[0009] The above-mentioned correction processing device for hot-rolled elliptical coils, the lifting and lowering mechanism includes a column, a second electric cylinder, a guide plate and a horizontal plate; a hole is provided at the top end of the column, and the second electric cylinder is arranged in the hole at the top end of the column; the end of the piston rod of the second electric cylinder is connected to the bottom end surface of the horizontal plate; a guide hole is provided on the top end surface of the column, a guide plate is provided at the bottom end of the horizontal plate, and the guide plate is inserted into the guide hole at the top end of the column.

[0010] The above-mentioned correction processing device for hot-rolled elliptical coils, the lower extrusion part includes a lower arc plate, a lower support block and a lower arc pressure plate; the lower arc plate is arranged between the top ends of the columns on both sides, and the opening direction of the lower arc plate is upward; the number of the lower support blocks is two, and they are symmetrically arranged on both sides of the upper end surface of the lower arc plate; the lower arc pressure plate is hingedly arranged on the upper end surface of the lower support block.

[0011] The above-mentioned correction processing device for hot-rolled elliptical coils, the upper extrusion part includes an upper arc plate, an upper support block and an upper arc pressure plate; the upper arc plate is arranged between the horizontal plates on both sides, and the opening direction of the upper arc plate is downward; the number of the upper support blocks is two, and they are symmetrically arranged on both sides of the lower end surface of the upper arc plate; the upper arc pressure plate is hingedly arranged on the lower end surface of the upper support block.

[0012] The above-mentioned correction processing device for hot-rolled elliptical coils, the heating part includes a slide plate, a second slide rail, a third electric cylinder, a vertical plate, a vertical column, a vertical rod and an electric heating winding coil; the second slide rail is set on the ground, and it is located on one side of the extrusion part; the slide plate is slidably set on the second slide rail; the third electric cylinder is set at the center of the top end surface of the slide plate, and the end of its piston rod is connected to the top end surface of the vertical plate; the number of the vertical columns is two, and they are symmetrically arranged on both sides of the upper end surface of the slide plate, and vertical grooves are arranged on the side walls of the vertical columns; vertical rods are arranged on both sides of the side walls of the vertical plate, and the vertical rods on both sides are respectively slidably set in the vertical grooves of the vertical columns on both sides; the electric heating winding coils are evenly arranged on the end surface of the vertical plate close to the extrusion part.

[0013] A correction method for a hot-rolled oval coil comprises the following steps: Step 1: After placing the steel strip on the lower arc-shaped pressing plate, the third electric cylinders on both sides are activated to raise the vertical plate so that it can be aligned with the steel strip, and then the slide plate is slid so that the electric heating winding coils on both sides are close to the side of the steel strip; the power supply of the electric heating winding coil is turned on to heat the side wall of the oval steel strip; after the heating operation is completed, the third electric cylinder is reset to drive the vertical plate downward; Step 2: After being heated, the oval steel strip is easier to shape; start the second electric cylinder to drive the lower arc plate and the upper arc plate to approach each other, so that the upper arc pressing plate and the lower arc pressing plate cooperate to extrude and shape the oval steel strip, and perform preliminary shaping on the oval steel strip, so that it is deformed from an oval shape to a circular shape; Step 3: Start the first electric cylinder to raise the lifting plate until the axis of the horizontal cylinder is aligned with the axis of the strip, and then push the base to slide until the expansion mechanism is located inside the strip; then start the hydraulic cylinder, which pushes the push column and the push rod forward, thereby driving the first hinge rod and the second hinge rod to tilt, and the arc expansion plate moves away from the horizontal cylinder under the push of the hinge rod. When the arc expansion plate expands in all directions and contacts the inner wall of the strip, it pushes the inner wall of the strip to expand evenly in all directions until the inner wall of the strip is in a circular state; Step 4: When the strip is corrected and restored to a circular shape, all parts are reset and the strip can be removed.

[0014] The present invention heats the steel strip through a heating part, so that the steel strip is easier to shape under a higher temperature state; the two ends of the elliptical steel strip with the largest outward expansion are extruded through an extrusion part, so that it transitions from an ellipse to a circle; and the steel strip is expanded from the inner wall to the outside through an expansion part, thereby expanding the steel strip from the inside to the outside, so that the inner wall contour of the steel strip gradually becomes round. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a schematic diagram of the overall three-dimensional structure of the present invention; Figure 2 This is a schematic diagram of the three-dimensional structure of the extrusion part of the present invention; Figure 3 It is a schematic diagram of the internal three-dimensional structure of the expansion part of the present invention.

[0016] The list of numbers in the figure is: 1. base, 2. lifting plate, 3. horizontal cylinder, 4. hydraulic cylinder, 5. push column, 6. push rod, 7. round plate, 8. arc expansion plate, 9. strip groove, 10. guide plate, 11. first hinge rod, 12. second hinge rod, 13. column, 14. second electric cylinder, 15. guide plate, 16. horizontal plate, 17. lower arc plate, 18. lower arc pressure plate, 19. upper arc plate, 20. upper arc pressure plate, 21. slide plate, 22. third electric cylinder, 23. vertical plate, 24. vertical column, 25. vertical rod, 26. electric heating winding coil. DETAILED DESCRIPTION

[0017] See also Figure 1 , 2 and Figure 3 The present invention includes a heating part, an extrusion part and an expansion part; the number of the heating parts is two, and they are symmetrically arranged on both sides of the extrusion part; the heating parts on both sides can heat the two sides of the elliptical strip steel, and the strip steel under high temperature state is easy to be shaped; the strip steel is extruded from the outside by the extrusion part to shape it; the strip steel is expanded and shaped from the inside to the outside by the expansion part; the expansion part is arranged on one side of the heating part; the expansion part includes a lifting mechanism, a pushing mechanism and an expansion mechanism; the pushing mechanism is arranged on the lifting mechanism; the expansion mechanism is arranged on the pushing mechanism.

[0018] The lifting mechanism includes a base 1, a first slide rail, a first electric cylinder and a lifting plate 2; the first slide rail is arranged on the ground, and the base 1 is slidably arranged on the first slide rail; the base 1 slides on the first slide rail, thereby driving the pushing mechanism and the expansion mechanism to approach or move away from the strip steel; a hole is arranged at the center of the top end surface of the base 1, and the first electric cylinder is arranged in the hole of the top end surface of the base 1, and the end of the piston rod of the first electric cylinder is connected to the center of the bottom end surface of the lifting plate 2; the first electric cylinder can drive the lifting plate 2 to rise and fall, thereby enabling the expansion mechanism to align with the center hole of the strip steel; a guide rod is arranged on the bottom end surface of the lifting plate 2, and a guide hole is arranged at the top end of the base 1, and the guide rod is inserted into the guide hole of the base 1; the guide rod provides guidance for the lifting and lowering of the lifting plate 2 to ensure its reliable lifting and lowering.

[0019] The pushing mechanism includes a horizontal cylinder 3, a hydraulic cylinder 4, a push column 5, a push rod 6 and a disc 7; the shell of the horizontal cylinder 3 is arranged on the top surface of the lifting plate 2 through a bracket; the shell of the hydraulic cylinder 4 is arranged at one end of the horizontal cylinder 3; the push column 5 is arranged in the horizontal cylinder 3, and its length is less than the length of the horizontal cylinder 3; the end of the piston rod of the hydraulic cylinder 4 is connected to the end of the push column 5; the hydraulic cylinder 4 drives the push column 5 and the push rod 6 to move forward and backward synchronously through the extension and contraction of the piston rod; the disc 7 is arranged on the inner wall of the horizontal cylinder 3; the push rod 6 is arranged on the end surface of the push column 5 away from the hydraulic cylinder 4, the disc 7 has a hole in the center, and the push rod 6 passes through the center hole of the disc 7.

[0020] The expansion mechanism includes a plurality of expansion members, and each expansion member is symmetrically arranged on the outer wall of the horizontal cylinder 3 in a circumferential direction; the expansion members include an arc-shaped expansion plate 8, a strip groove 9, a guide plate 10, a first hinge rod 11 and a second hinge rod 12; the strip groove 9 is arranged on the outer wall of the horizontal cylinder 3, and it connects the inner and outer walls of the horizontal cylinder 3, and the length direction of the strip groove 9 is parallel to the axial center line direction of the horizontal cylinder 3; the disc 7 is located at the center position of the strip groove 9; the arc-shaped expansion plate 8 covers the outer wall of the horizontal cylinder 3, and it is located outside the strip groove 9; when the arc-shaped expansion plate 8 expands and moves outward, it expands outward inside the strip steel, which makes the inside of the elliptically deformed strip steel gradually rounded, and then restores the round strip steel state; the bottom end surface of the arc-shaped expansion plate 8 is provided with a first upper hinge seat and a second upper hinge seat; the outer wall of the push rod 6 is provided with a first lower hinge seat The hinge seat and the second lower hinge seat; the top end of the first hinge rod 11 is hingedly connected to the first upper hinge seat, and the bottom end of the first hinge rod 11 is hingedly connected to the first lower hinge seat; the top end of the second hinge rod 12 is hingedly connected to the second upper hinge seat, and the bottom end of the second hinge rod 12 is hingedly connected to the second lower hinge seat; the first upper hinge seat, the first lower hinge seat and the first hinge rod 11 are located on the same side of the disc 7, and the second upper hinge seat, the second lower hinge seat and the second hinge rod 12 are located on the other side of the disc 7; the first upper hinge seat and the second upper hinge seat are both located in the strip groove 9; a guide piece 10 is provided at the center of the inner side wall of the arc expansion plate 8, a guide hole is provided on the circumferential side wall of the disc 7, and the guide piece 10 is inserted in the guide hole of the disc 7; the existence of the guide piece 10 makes the arc expansion plate 8 reliably move along the radial direction of the original disc 7.

[0021] The extrusion part includes a lifting and lowering mechanism, a lower extrusion piece and an upper extrusion piece; there are two lifting and lowering mechanisms, which are arranged opposite to each other on the ground; the lower extrusion piece and the upper extrusion piece are arranged between the lifting and lowering mechanisms on both sides; the lifting and lowering mechanism drives the lower extrusion piece and the upper extrusion piece to approach each other, thereby extruding the elliptical strip steel, and finally correcting the elliptical deformed strip steel.

[0022] The lifting and lowering mechanism includes a column 13, a second electric cylinder 14, a guide plate 15 and a horizontal plate 16; a hole is provided at the top of the column 13, and the second electric cylinder 14 is arranged in the hole at the top of the column 13; the end of the piston rod of the second electric cylinder 14 is connected to the bottom end surface of the horizontal plate 16; the second cylinder 14 can drive the horizontal plate 16 to lift and lower vertically; a guide hole is provided on the top end surface of the column 13, a guide plate 15 is provided at the bottom end of the horizontal plate 16, and the guide plate 15 is inserted into the guide hole at the top end of the column 13; the guide plate 15 ensures that the horizontal plate 16 can be reliably lifted and lowered.

[0023] The lower extrusion member includes a lower arc plate 17, a lower support block and a lower arc pressure plate 18; the lower arc plate 17 is arranged between the top ends of the columns 13 on both sides, and the opening direction of the lower arc plate 17 is upward; there are two lower support blocks, and they are symmetrically arranged on both sides of the upper end surface of the lower arc plate 17; the existence of two lower arc pressure plates 18 enables the strip to be better supported; the lower arc pressure plate 18 is hingedly arranged on the upper end surface of the lower support block.

[0024] The upper extrusion member includes an upper arc plate 19, an upper support block and an upper arc pressure plate 20; the upper arc plate 19 is arranged between the horizontal plates 16 on both sides, and the opening direction of the upper arc plate 19 faces downward; there are two upper support blocks, and they are symmetrically arranged on both sides of the lower end surface of the upper arc plate 19; the upper arc pressure plate 20 is hingedly arranged on the lower end surface of the upper support block; the upper arc pressure plate and the lower arc pressure plate cooperate to reliably clamp and extrude the strip steel.

[0025] The heating part includes a slide plate 21, a second slide rail, a third electric cylinder 22, a vertical plate 23, a vertical column 24, a vertical rod 25 and an electric heating winding coil 26; the second slide rail is set on the ground and is located on one side of the extrusion part; the slide plate 21 is slidably set on the second slide rail; the slide plate 21 adjusts the position of the rest of the heating part by moving, so as to keep a suitable distance between it and the strip; the third electric cylinder 22 is set at the center of the top end surface of the slide plate 21, and the end of its piston rod is connected to the top end surface of the vertical plate 23; the third electric cylinder 22 can adjust the position of the vertical plate 23 , so that it can approach the strip at a suitable height; the number of the vertical columns 24 is two, and they are symmetrically arranged on both sides of the upper end surface of the slide plate 21, and vertical grooves are arranged on the side walls of the vertical columns 24; vertical rods 25 are arranged on both sides of the side walls of the vertical plate 23, and the vertical rods 25 on both sides are respectively slidably arranged in the vertical grooves of the vertical columns 24 on both sides; the cooperation of the vertical columns 24 and the vertical rods 25 makes the vertical plate 23 better lifted and lowered; electric heating winding coils 26 are evenly arranged on the end surface of the vertical plate 23 close to the extrusion part, and the electric heating winding coils 26 are used to heat the side walls of the strip.

[0026] The present invention comprises the following steps: Step 1: After the steel strip is placed on the lower arc-shaped pressing plate 18, the third electric cylinders 22 on both sides are activated to raise the vertical plate 23 so that it can be aligned with the steel strip, and then the slide plate 21 is slid so that the electric heating winding coils 26 on both sides are close to the side of the steel strip; the power supply of the electric heating winding coils 26 is turned on to heat the side wall of the elliptical steel strip; after the heating operation is completed, the third electric cylinder 22 is reset to drive the vertical plate 23 downward; Step 2: After being heated, the oval steel strip is easier to shape; start the second electric cylinder 14 to drive the lower arc plate 17 and the upper arc plate 19 to approach each other, so that the upper arc pressing plate 20 and the lower arc pressing plate 18 cooperate to extrude and shape the oval steel strip, and perform preliminary shaping on the oval steel strip, so that it is deformed from an oval shape to a circular shape; Step 3: Start the first electric cylinder to raise the lifting plate 2 until the axis of the horizontal cylinder 3 is aligned with the axis of the strip, and then push the base 1 to slide until the expansion mechanism is located inside the strip; then start the hydraulic cylinder 4, which pushes the push column 5 and the push rod 6 forward, thereby driving the first hinge rod 11 and the second hinge rod 12 to tilt, and the arc expansion plate 8 is pushed away from the horizontal cylinder 3 by the hinge rod. When the arc expansion plate 8 expands in all directions and contacts the inner wall of the strip, it pushes the inner wall of the strip to expand evenly in all directions until the inner wall of the strip is in a circular state; Step 4: When the strip is corrected and restored to a circular shape, all parts are reset and the strip can be removed.

Claims

1. A correction device for hot-rolled oval coils, characterized in that: It includes a heating part, an extrusion part and an expansion part; the number of the heating parts is two, and they are symmetrically arranged on both sides of the extrusion part; the expansion part is arranged on one side of the heating part; the expansion part includes a lifting mechanism, a pushing mechanism and an expansion mechanism; the pushing mechanism is arranged on the lifting mechanism; the expansion mechanism is arranged on the pushing mechanism.

2. The hot rolled oval coil correction device according to claim 1, characterized in that: The lifting mechanism comprises a base (1), a first slide rail, a first electric cylinder and a lifting plate (2); the first slide rail is arranged on the ground, and the base (1) is slidably arranged on the first slide rail; a hole is arranged at the center of the top end surface of the base (1), and the first electric cylinder is arranged in the hole of the top end surface of the base (1), and the end of the piston rod of the first electric cylinder is connected to the center of the bottom end surface of the lifting plate (2); a guide rod is arranged at the bottom end surface of the lifting plate (2), and a guide hole is arranged at the top end of the base (1), and the guide rod is inserted into the guide hole of the base (1).

3. The hot rolled oval coil correction device according to claim 2, characterized in that: The pushing mechanism comprises a horizontal cylinder (3), a hydraulic cylinder (4), a push column (5), a push rod (6) and a disc (7); the shell of the horizontal cylinder (3) is arranged on the top surface of the lifting plate (2) through a bracket; the shell of the hydraulic cylinder (4) is arranged at one end of the horizontal cylinder (3); the push column (5) is arranged in the horizontal cylinder (3), and its length is less than the length of the horizontal cylinder (3); the end of the piston rod of the hydraulic cylinder (4) is connected to the end of the push column (5); the disc (7) is arranged on the inner wall of the horizontal cylinder (3); the push rod (6) is arranged on the end surface of the push column (5) away from the hydraulic cylinder (4), the disc (7) has a hole in the center, and the push rod (6) passes through the center hole of the disc (7).

4. The hot rolled oval coil correction device according to claim 3, characterized in that: The expansion mechanism comprises a plurality of expansion members, and each expansion member is symmetrically arranged on the outer wall of the horizontal cylinder (3); the expansion member comprises an arc expansion plate (8), a strip groove (9), a guide plate (10), a first hinge rod (11) and a second hinge rod (12); the strip groove (9) is arranged on the outer wall of the horizontal cylinder (3) and is connected to the inner and outer walls of the horizontal cylinder (3), and the length direction of the strip groove (9) is parallel to the axial center line direction of the horizontal cylinder (3); the disc (7) is located at the center position of the strip groove (9); the arc expansion plate (8) covers the outer wall of the horizontal cylinder (3) and is located outside the strip groove (9); the bottom end surface of the arc expansion plate (8) is provided with a first upper hinge seat and a second upper hinge seat; the outer wall of the push rod (6) is provided with a first lower hinge seat and a second lower hinge seat. The top end of the first hinge rod (11) is hingedly connected to the first upper hinge seat, and the bottom end of the first hinge rod (11) is hingedly connected to the first lower hinge seat; the top end of the second hinge rod (12) is hingedly connected to the second upper hinge seat, and the bottom end of the second hinge rod (12) is hingedly connected to the second lower hinge seat; the first upper hinge seat, the first lower hinge seat and the first hinge rod (11) are located on the same side of the disc (7), and the second upper hinge seat, the second lower hinge seat and the second hinge rod (12) are located on the other side of the disc (7); the first upper hinge seat and the second upper hinge seat are both located in the strip groove (9); a guide plate (10) is provided at the center of the inner side wall of the arc expansion plate (8), a guide hole is provided on the circumferential side wall of the disc (7), and the guide plate (10) is inserted into the guide hole of the disc (7).

5. The hot rolled oval coil correction device according to claim 4, characterized in that: The extrusion part comprises a lifting and lowering mechanism, a lower extrusion piece and an upper extrusion piece; the number of the lifting and lowering mechanisms is two, and they are arranged oppositely on the ground; the lower extrusion piece and the upper extrusion piece are both arranged between the lifting and lowering mechanisms on both sides.

6. The hot rolled oval coil correction device according to claim 5, characterized in that: The lifting and lowering mechanism comprises a column (13), a second electric cylinder (14), a guide plate (15) and a horizontal plate (16); a hole is provided at the top end of the column (13), and the second electric cylinder (14) is arranged in the hole at the top end of the column (13); the end of the piston rod of the second electric cylinder (14) is connected to the bottom end surface of the horizontal plate (16); a guide hole is provided at the top end surface of the column (13), a guide plate (15) is provided at the bottom end of the horizontal plate (16), and the guide plate (15) is inserted into the guide hole at the top end of the column (13).

7. The hot rolled oval coil correction device according to claim 6, characterized in that: The lower extrusion member comprises a lower arc plate (17), a lower support block and a lower arc pressure plate (18); the lower arc plate (17) is arranged between the top ends of the columns (13) on both sides, and the opening direction of the lower arc plate (17) faces upward; the number of the lower support blocks is two, and they are symmetrically arranged on both sides of the upper end surface of the lower arc plate (17); the lower arc pressure plate (18) is hingedly arranged on the upper end surface of the lower support block.

8. The hot rolled oval coil correction device according to claim 7, characterized in that: The upper extrusion member comprises an upper arc plate (19), an upper support block and an upper arc pressure plate (20); the upper arc plate (19) is arranged between the horizontal plates (16) on both sides, and the opening direction of the upper arc plate (19) faces downward; the number of the upper support blocks is two, and they are symmetrically arranged on both sides of the lower end surface of the upper arc plate (19); the upper arc pressure plate (20) is hingedly arranged on the lower end surface of the upper support block.

9. The hot rolled oval coil correction device according to claim 8, characterized in that: The heating part comprises a slide plate (21), a second slide rail, a third electric cylinder (22), a vertical plate (23), a vertical column (24), a vertical rod (25) and an electric heating winding coil (26); the second slide rail is arranged on the ground and is located on one side of the extrusion part; the slide plate (21) is slidably arranged on the second slide rail; the third electric cylinder (22) is arranged at the center of the top end surface of the slide plate (21), and the end of its piston rod is connected to the top end surface of the vertical plate (23); the number of the vertical columns (24) is two, and they are symmetrically arranged on both sides of the upper end surface of the slide plate (21), and the side walls of the vertical columns (24) are provided with vertical grooves; the side walls of the vertical plate (23) are provided with vertical rods (25), and the vertical rods (25) on both sides are respectively slidably arranged in the vertical grooves of the vertical columns (24) on both sides; the electric heating winding coil (26) is evenly arranged on the end surface of the vertical plate (23) close to the extrusion part.

10. A correction method for hot-rolled oval coil according to any one of claims 1 to 9, characterized in that: The steps include: Step 1: After the steel strip is placed on the lower arc-shaped pressing plate (18), the third electric cylinders (22) on both sides are activated to raise the vertical plate (23) so that it can be aligned with the steel strip, and then the slide plate (21) is slid so that the electric heating coils (26) on both sides are close to the side of the steel strip; the power supply of the electric heating coils (26) is turned on so that it heats the side wall of the elliptical steel strip; after the heating operation is completed, the third electric cylinder (22) is reset to drive the vertical plate (23) downward; Step 2: After the elliptical steel strip is heated, it is easier to shape; the second electric cylinder (14) is started to drive the lower arc plate (17) and the upper arc plate (19) to approach each other, so that the upper arc pressing plate (20) and the lower arc pressing plate (18) cooperate to extrude and shape the elliptical steel strip, and the elliptical steel strip is initially shaped so that it is deformed from an elliptical shape to a circular shape; Step 3: Start the first electric cylinder to raise the lifting plate (2) until the axis of the horizontal cylinder (3) is aligned with the axis of the steel strip, and then push the base (1) to slide until the expansion mechanism is located inside the steel strip; then start the hydraulic cylinder (4), which pushes the push column (5) and the push rod (6) forward, thereby driving the first hinge rod (11) and the second hinge rod (12) to tilt, and the arc expansion plate (8) moves away from the horizontal cylinder (3) under the push of the hinge rod. When the arc expansion plate (8) expands in all directions and contacts the inner wall of the steel strip, it pushes the inner wall of the steel strip to expand evenly in all directions until the inner wall of the steel strip is in a circular state; Step 4: When the strip is corrected and restored to a circular shape, all parts are reset and the strip can be removed.

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