Rolling mill for producing steel ring with equal elongation on both inner and outer surfaces

Abstract

The application discloses a rolling mill for steel rings with equal elongation rates on the inner and outer surfaces, and relates to the field of steel ring rolling mills.The rolling mill comprises a box body, a mounting table is arranged in the middle of the box body, a sliding rail is arranged on the upper portion of the mounting table, a sliding table is slidably connected in the sliding rail, a sliding roller is rotatably connected to the sliding table, a fixed roller is rotatably connected below the sliding roller, a lifting roller capable of contacting the fixed roller is arranged at the bottom end of the mounting table, a horizontal distance measuring structure capable of lifting is arranged at the central positions of the fixed roller and the sliding roller, pressing tables are fixedly connected to the two sides below the fixed roller, and a thickness measuring structure facing the steel ring is arranged on the pressing tables.The vertical steel ring rolling structure is arranged on the mounting table, the rollers are slidably connected on the sliding rail, the situation that the elongation rates of the inner and outer surfaces of the steel ring are different during the rolling process is effectively prevented, and the rolled steel ring maintains uniform thickness.

Description

Technical Field

[0001] This invention relates to the field of steel ring rolling mills, specifically to a rolling mill that produces steel rings with equal elongation on both the inner and outer sides. Background Technology

[0002] A steel belt continuously variable transmission (CVT) is a transmission that uses the change in diameter of a steel belt or chain on a steel pulley to achieve continuously variable speed. The steel belt in a CVT is composed of two multi-layered steel rings and hundreds of push plates.

[0003] The steel ring assembly in the steel strip has extremely high requirements for form and position tolerances, dimensional tolerances, and fit tolerances. At the same time, it also places extremely high demands on load-bearing capacity and fatigue resistance. In the existing steel ring production process, long strip raw materials need to be welded into rings using laser welding equipment. Due to the thinness of the steel ring, it is difficult to use a vertical ring rolling mill due to the deformation caused by its own gravity. In the existing technology, a horizontal ring rolling mill is generally used to process the steel ring. During the processing, the diameter and thickness of the steel ring are checked multiple times until the diameter and thickness of the steel ring meet the standards. Then, the steel ring is removed and a new steel ring to be rolled is placed in it. The steel ring rolled by the rolling mill also needs to undergo heat treatment to improve its load-bearing capacity and fatigue resistance.

[0004] Regarding the aforementioned technologies, due to the thin wall thickness of the steel rings in the steel strip, the horizontal ring rolling mill's clamping arms are prone to uneven force application during the rolling process, causing deformation of the steel ring. This results in differences in the curvature of the steel ring on both sides of the roll, leading to different elongation rates on the inner and outer surfaces of the steel ring. This easily leads to uneven rolling thickness of the steel ring, affecting its load-bearing capacity and service life in later use. Furthermore, in the existing steel ring rolling process, to determine whether the steel ring has been rolled completely, multiple measurements of the steel ring's diameter and thickness are required. These measurements necessitate pausing the horizontal ring rolling mill, impacting rolling efficiency. In summary, existing steel ring rolling mills are prone to uneven rolling thickness when rolling steel rings. Summary of the Invention

[0005] Based on this, the purpose of the present invention is to provide a rolling mill with equal elongation on both the inner and outer sides of a steel ring, so as to solve the technical problem that the existing steel ring rolling mill is prone to uneven rolling thickness of the steel ring.

[0006] To achieve the above objectives, the present invention provides the following technical solution: a rolling mill with equal elongation on both the inner and outer sides of a steel ring, comprising a housing, an installation platform in the middle of the housing, a slide rail in the upper part of the installation platform, a slide table slidably connected within the slide rail, a sliding roll rotatably connected to the slide table, a fixed roll rotatably connected to the installation platform directly below the sliding roll, a lifting roll capable of contacting the fixed roll at the bottom of the installation platform, the lifting roll rotatably connected to the lifting platform, a lifting structure at the bottom of the lifting platform, a horizontal distance measuring structure capable of lifting and lowering at the center position of the fixed roll and the sliding roll, the distance between the contact surfaces of the fixed roll and the sliding roll contacting the steel ring being equal to the diameter of the steel ring, and pressure platforms fixedly connected to both sides of the installation platform below the fixed roll, with thickness measuring structures facing the steel ring on the pressure platforms.

[0007] By adopting the above technical solution, a vertical steel ring rolling structure is used, with a slide rail set on the mounting platform. Rollers are slidably connected up and down in the slide rail, so that the slidably connected rolls cooperate with the rolls fixed on the mounting platform. This effectively prevents the steel ring from having different elongation rates on the inner and outer sides during the rolling process, thus ensuring that the rolled steel ring has a uniform thickness.

[0008] The present invention is further configured such that a first fixing plate is fixedly connected to the bottom end of the slide table, and a second fixing plate is provided above the fixed roller on the mounting platform. At least one first toothed belt is provided on the first fixing plate facing the second fixing plate, and at least one second toothed belt is provided on the second fixing plate facing the first fixing plate. The first toothed belt and the second toothed belt are parallel to each other and both pass through the toothed belt box. The teeth of the first toothed belt and the second toothed belt are arranged facing each other and mesh with the same gear.

[0009] By adopting the above technical solution, the gears inside the toothed belt box are driven to rotate by the up-and-down movement of the first fixed plate. While the gears inside the toothed belt box are rotating, the first toothed belt and the second toothed belt move upward and downward relative to the gears, respectively. This allows the toothed belt box to remain in the center position between the fixed roller and the sliding roller, providing the conditions for the rangefinder installed on the toothed belt box to accurately measure the horizontal diameter of the inner wall of the steel ring.

[0010] The invention is further configured such that the toothed belt box is located at the center between the fixed roll and the sliding roll, and the toothed belt box is provided with a rangefinder facing both sides.

[0011] By adopting the above technical solution, the horizontal diameter of the inner wall of the steel ring is measured using a rangefinder. Since the diameter of the inner wall of the steel ring in the vertical direction is determined when the steel ring is installed, and the vertical diameter is kept as the rolling target diameter of the steel ring, when the horizontal diameter is equal to the rolling target diameter, it means that the diameter of the steel ring meets the requirements.

[0012] The invention is further configured such that a second telescopic rod is provided on the mounting platform, a lifting platform is connected to the top of the second telescopic rod, and a lifting roller with an axis parallel to the axis of the fixed roller is rotatably connected to the top of the lifting platform. The contact surface between the fixed roller and the lifting roller is also parallel to the axial direction of the lifting roller.

[0013] By adopting the above technical solution, the extension of the second telescopic rod causes the lifting roller to rise, and the interaction force between the lifting roller and the fixed roller squeezes the steel ring, thereby achieving the purpose of rolling the steel ring.

[0014] The present invention is further configured such that a first stop bar is connected to both sides of the mounting platform inside the box body, and a box door is rotatably connected to both sides of the box body. A second stop bar is connected to each box door. When the box door is closed, the projections of the first stop bar and the second stop bar toward the box door coincide.

[0015] By adopting the above technical solution, the first and second stop rods play a role in limiting the steel ring when the box door is closed, effectively preventing the steel ring from swinging on both sides during the rolling process.

[0016] The present invention is further configured such that a fixed column is fixedly connected to the door, a telescopic column is slidably connected inside the fixed column, one end of the telescopic column is connected to a second stop bar, and a compression spring is provided between the other end and the bottom surface of the inner wall of the fixed column.

[0017] By adopting the above technical solution, the swaying of the steel ring on both sides during the rolling process can be further avoided.

[0018] The invention is further configured such that the top surface of the pressure table is lower than the bottom surface of the fixed roll, an upward-facing thickness measuring probe is provided on the pressure table, the thickness measuring probe is connected to a thickness gauge via a wire, and the thickness gauge is mounted on the mounting platform.

[0019] By adopting the above technical solution, the steel ring can be better fitted onto the pressure table when the pressure plate is pressed down, thereby providing better measurement conditions for the thickness measuring probe and achieving the purpose of accurately measuring the thickness of the steel ring.

[0020] The invention is further configured such that the mounting platform is provided with first telescopic rods facing downward on both sides of the second fixed plate, and the bottom end of the first telescopic rods is provided with a pressure plate facing the pressure table, and the projection of the pressure plate toward the pressure table completely covers the thickness measuring probe.

[0021] By adopting the above technical solution, the extension of the telescopic part of the first telescopic rod is used to drive the pressure plate to move downward, pressing the steel ring onto the pressure plate, so that the thickness measuring probe can accurately measure the wall thickness of the steel ring.

[0022] The present invention is further configured such that the heights of the fixed roller, the sliding roller, and the lifting roller are all greater than the height of the steel ring, and the distance between the first stop bar and the second stop bar is equal to the height of the steel ring when the box door is closed.

[0023] By adopting the above technical solution, the situation where the height of the steel ring is greater than the height of the roll cannot be rolled is prevented, and the stability of the steel ring rolling process is improved at the same time.

[0024] A rolling process for producing a steel ring with equal elongation on both its inner and outer sides, using a rolling mill that produces the same elongation on both sides, includes the following steps:

[0025] Step 1: Grind the weld seam of the laser-welded steel ring until it matches the curvature of the inner and outer surfaces of the steel ring.

[0026] Step 2: Hang the steel ring on the rolling roll and adjust the height of the rolling roll so that the distance between the top surface of the rolling roll and the bottom surface of the fixed roll is equal to the target rolling diameter of the steel ring;

[0027] Step 3: Perform the first rolling of the steel ring, maintain the rolling pressure between the fixed roll and the sliding roll at 100-150MPa, maintain the rotation speed of the fixed roll at 100-150r / min, extend the first telescopic rod once every 0.5-1min, and stop rolling when the distance measuring instrument and the thickness measuring instrument simultaneously read the data that the steel ring size is qualified.

[0028] Step 4: Using charcoal and urea in a mass ratio of 1:3 as infiltration agents, the steel ring rolled in Step 3 is placed into an electric furnace for nitrocarburizing. The nitrocarburizing temperature is 600-620°C, and the temperature is held for 2-3 hours. After removing from the furnace, the ring is water-quenched.

[0029] Step 5: Perform the second rolling of the steel ring, maintaining the rolling pressure between the fixed roll and the sliding roll at 200-220MPa, and keeping the rotation speed of the fixed roll at 30-40r / min. The first telescopic rod extends once every 2-3 minutes. Stop rolling when the distance measuring instrument and the thickness gauge simultaneously read the data indicating that the steel ring size is qualified.

[0030] Step Six: Place the steel ring obtained from step five into an electric furnace and hold it at 180-190°C for 4-6 hours. Then, remove it from the furnace and air-cool it for quenching.

[0031] In summary, the present invention has the following main beneficial effects:

[0032] 1. This invention uses a vertical steel ring rolling structure, with a slide rail on the mounting platform and a roller slidingly connected inside the slide rail. The sliding roller cooperates with the roller fixed on the mounting platform, moving the sliding roller to the target diameter position of the steel ring. A horizontal laser ranging device continuously positioned between the fixed roller and the sliding roller measures the diameter of the inner ring of the steel ring. When the horizontal diameter of the steel ring meets the standard, and the thickness of the steel ring measured by the thickness measuring structure also meets the standard, one rolling operation of the steel ring is completed. This effectively prevents the inner and outer elongation rates of the steel ring from being different during the rolling process, thus ensuring that the rolled steel ring has a uniform thickness.

[0033] 2. This invention utilizes a structure in which the toothed belt and the toothed belt box cooperate with each other. While the sliding roller moves up and down, the toothed belt box also moves up and down under the drive of the two sets of toothed belt structures. This ensures that the laser ranging device on the toothed belt box is always kept in the position between the sliding roller and the fixed roller. This position is also the circular position of the steel ring, thereby measuring a more accurate inner diameter of the steel ring in the horizontal direction.

[0034] 3. This invention sets vertical baffles inside the box structure and sets another set of baffles on the box door corresponding to the baffles. The baffles inside the box and the baffles on the box door work together to limit the edge of the steel ring, effectively preventing the steel ring from vibrating during the rolling process, greatly improving the stability of the steel ring rolling and further improving the quality of the steel ring rolling. Attached Figure Description

[0035] Figure 1 This is a perspective view of the box door in the open state of the present invention;

[0036] Figure 2 This is a perspective view of the box door in the open state, representing another aspect of the present invention.

[0037] Figure 3 For the present invention Figure 2 Enlarged view of A in the middle;

[0038] Figure 4 This is a perspective view of one of the cabinet doors of the present invention after removal;

[0039] Figure 5 For the present invention Figure 4 Enlarged view of B in the middle;

[0040] Figure 6 This is a perspective view of the box door with the present invention removed;

[0041] Figure 7 For the present invention Figure 6 Enlarged view of C in the middle;

[0042] Figure 8 For the present invention Figure 6 Enlarged view of D;

[0043] Figure 9 For the present invention Figure 6 A magnified view of E in the middle.

[0044] In the diagram: 1. Box body; 2. Mounting platform; 3. Fixed roller; 4. Sliding roller; 5. Lifting roller; 6. Slide rail; 7. Slide table; 8. First fixed plate; 9. Second fixed plate; 10. First toothed belt; 11. Second toothed belt; 12. Toothed belt box; 13. Rangefinder; 14. Pressing platform; 15. Thickness probe; 16. Thickness gauge; 17. First telescopic rod; 18. Pressing plate; 19. Second telescopic rod; 20. Guide rod; 21. Lifting platform; 22. First stop bar; 23. Second stop bar; 24. Box door; 25. Fixed column; 26. Telescopic column; 27. Steel ring body. Detailed Implementation

[0045] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and should not be construed as limiting the present invention.

[0046] The embodiments of the present invention will now be described.

[0047] Example 1

[0048] A rolling mill with equal elongation on both the inner and outer sides of a steel ring, such as... Figure 1-9 As shown, the device includes a housing 1, with a mounting platform 2 located in the center of the housing 1. A slide rail 6 is installed on the upper part of the mounting platform 2, and a slide table 7 is slidably connected within the slide rail 6. Specifically, a servo motor-driven lead screw within the slide rail 6 controls the up-and-down movement of the slide table 7 to ensure the accuracy of its movement. A sliding roller 4 is rotatably connected to the slide table 7. A fixed roller 3 is rotatably connected to the mounting platform 2 directly below the sliding roller 4. Specifically, a drive motor is installed within the mounting platform 2 to drive the fixed roller 3 to rotate. A power supply is installed at the bottom of the mounting platform 2. A lifting roller 5 is connected to the fixed roller 3. The lifting roller 5 is rotatably connected to the lifting platform 21. The bottom end of the lifting platform 21 is provided with a lifting structure. Specifically, the lifting structure includes a second telescopic rod 19. A horizontal distance measuring structure that can be raised and lowered is provided at the center position of the fixed roller 3 and the sliding roller 4. The distance between the contact surfaces of the fixed roller 3 and the sliding roller 4 that contact the steel ring is equal to the diameter of the steel ring. The mounting platform 2 is fixedly connected to pressure platforms 14 on both sides below the fixed roller 3, and a thickness measuring structure facing the steel ring is provided on the pressure platform 14.

[0049] Please see Figure 1 , Figure 4-9The mounting platform 2 is equipped with a second telescopic rod 19, and the top of the second telescopic rod 19 is connected to a lifting platform 21. The top of the lifting platform 21 is rotatably connected to a lifting roller 5 whose axis is parallel to the axis of the fixed roller 3. The contact surface between the fixed roller 3 and the lifting roller 5 is also parallel to the axial direction of the lifting roller 5. When the second telescopic rod 19 extends, the lifting roller 5 rises. The interaction force between the lifting roller 5 and the fixed roller 3 squeezes the steel ring, thereby achieving the purpose of rolling the steel ring. Specifically, in order to enhance the stability of the lifting platform 21 during lifting, four guide rods 20 that extend and retract together with the second telescopic rod 19 are provided between the lifting platform 21 and the mounting platform 2.

[0050] Please see Figure 6-8 The toothed belt box 12 is located at the center between the fixed roll 3 and the sliding roll 4. The toothed belt box 12 is equipped with a rangefinder 13 facing both sides. Specifically, the rangefinder 13 on the toothed belt box 12 is a laser rangefinder. The laser of the laser rangefinder irradiates the inner wall of the steel ring to accurately measure the horizontal diameter of the inner wall of the steel ring. The rangefinder 13 is used to measure the horizontal diameter of the inner wall of the steel ring. Since the diameter of the inner wall of the steel ring in the vertical direction is determined when the steel ring is installed, and the vertical diameter is kept as the rolling target diameter of the steel ring, when the horizontal diameter is equal to the rolling target diameter, it means that the diameter of the steel ring meets the requirements.

[0051] Please refer to 6-9. A first fixing plate 8 is fixedly connected to the bottom of the slide table 7. A second fixing plate 9 is provided on the mounting platform 2 above the fixed roller 3. At least one first toothed belt 10 is provided on the first fixing plate 8 facing the second fixing plate 9, and at least one second toothed belt 11 is provided on the second fixing plate 9 facing the first fixing plate 8. The first toothed belt 10 and the second toothed belt 11 are parallel to each other and both pass through the toothed belt box 12. The teeth of the first toothed belt 10 and the second toothed belt 11 face each other and mesh with the same gear. Specifically, the first toothed belt 10... Both the first toothed belt 10 and the second toothed belt 11 are provided with two toothed belts. The multi-toothed belt structure can ensure the stable up and down movement of the toothed belt box 12. The power of the up and down movement of the first fixed plate 8 drives the gear inside the toothed belt box 12 to rotate. While the gear inside the toothed belt box 12 rotates, the first toothed belt 10 and the second toothed belt 11 move upward and downward relative to the gear, respectively. This allows the toothed belt box 12 to be kept in the center position between the fixed roller 3 and the sliding roller 4, providing the conditions for the rangefinder installed on the toothed belt box 12 to accurately measure the horizontal diameter of the inner wall of the steel ring.

[0052] Please see Figure 6 , 8-9. The heights of the fixed roll 3, sliding roll 4, and lifting roll 5 are all greater than the height of the steel ring. When the box door 24 is closed, the distance between the first stop 22 and the second stop 23 is equal to the height of the steel ring, preventing the steel ring from being unable to be rolled due to its height exceeding the height of the rolls. The fact that the distance between the first stop 22 and the second stop 23 is the same as the height of the steel ring effectively limits the swaying of the steel ring on both sides, thus improving the stability of the steel ring rolling process. At the same time, because the two vertical first stop 22 and the two vertical second stop 23 are close to each other and limit the steel ring, the steel ring is also in a vertical position. The state, that is, the axis of the steel ring is kept parallel to the ground, so that the contact surface between the steel ring and the roll is also kept horizontal, thereby better ensuring that the inner and outer surfaces of the steel ring have the same elongation rate during the rolling process. The mounting platform 2 is provided with first telescopic rods 17 facing downward on both sides of the second fixed plate 9. The bottom end of the first telescopic rod 17 is provided with a pressure plate 18 facing the pressure table 14. The projection of the pressure plate 18 towards the pressure table 14 completely covers the thickness measuring probe 15. By extending the telescopic part of the first telescopic rod 17, the pressure plate 18 is moved downward, pressing the steel ring on the pressure plate 18, so that the thickness measuring probe 15 can accurately measure the wall thickness of the steel ring.

[0053] Please see Figure 6-9 The top surface of the pressure table 14 is lower than the bottom surface of the fixed roller 3. An upward-facing thickness measuring probe 15 is installed on the pressure table 14. The thickness measuring probe 15 is connected to a thickness gauge 16 via a wire. Specifically, the thickness gauge 16 is an ultrasonic thickness gauge. The thickness gauge 16 is connected to the thickness measuring probe 15 via a wire. The thickness measuring probe 15 is set vertically upward. The thickness gauge 16 is installed on the mounting platform 2. When the pressure plate 18 is pressed down, it can make the steel ring fit better against the pressure table 14, thereby providing better measurement conditions for the thickness measuring probe 15 and achieving the purpose of accurately measuring the thickness of the steel ring. Specifically, when the first telescopic rod 17 extends, since the steel ring is in a rotating state driven by the fixed roller 3, the edge of the pressure plate 18 will rub against the steel ring. After the pressure plate 18 presses down the steel ring, the thickness measuring probe 15 instantly completes the thickness measurement of the steel ring. The first telescopic rod 17 quickly resets and will not affect the normal rotation of the steel ring.

[0054] A rolling process for producing a steel ring with equal elongation on both its inner and outer sides, using a rolling mill that produces the same elongation on both sides, includes the following steps:

[0055] Step 1: Grind the weld seam of the laser-welded steel ring until it matches the curvature of the inner and outer surfaces of the steel ring.

[0056] Step 2: Hang the steel ring on the rolling roll and adjust the height of the rolling roll so that the distance between the top surface of the rolling roll and the bottom surface of the fixed roll is equal to the target rolling diameter of the steel ring;

[0057] Step 3: Perform the first rolling of the steel ring, maintain the rolling pressure between the fixed roll and the sliding roll at 100MPa, maintain the rotation speed of the fixed roll at 100r / min, extend the first telescopic rod once every 1min, and stop rolling when the rangefinder and thickness gauge simultaneously read the data that the steel ring size is qualified.

[0058] Step 4: Using charcoal and urea in a mass ratio of 1:3 as infiltration agents, the steel ring rolled in Step 3 is placed into an electric furnace for nitrocarburizing. The nitrocarburizing temperature is 600°C, and the temperature is maintained for 2 hours. After being removed from the furnace, the ring is water-quenched.

[0059] Step 5: Perform the second rolling of the steel ring, maintain the rolling pressure between the fixed roll and the sliding roll at 200MPa, maintain the rotation speed of the fixed roll at 30r / min, extend the first telescopic rod once every 3 minutes, and stop rolling when the rangefinder and thickness gauge simultaneously read the data that the steel ring size is qualified.

[0060] Step Six: Place the steel ring obtained from step five rolling into an electric furnace, hold it at 180°C for 4 hours, and then air-cool and quench it.

[0061] Example 2

[0062] A rolling mill with equal elongation on both the inner and outer sides of a steel ring, such as... Figure 1-9 As shown, based on Embodiment 1, the difference is that, inside the housing 1, first stop bars 22 are connected to both sides of the mounting platform 2, and housing doors 24 are rotatably connected to both sides of the housing 1. Second stop bars 23 are connected to each housing door 24. When the housing door 24 is closed, the projections of the first stop bars 22 and the second stop bars 23 towards the housing door 24 coincide. The first stop bars 22 and the second stop bars 23, when the housing door 24 is closed, serve to limit the movement of the steel ring, effectively preventing the steel ring from swinging during the rolling process. A fixed column 25 is fixedly connected to the upper part, and a telescopic column 26 is slidably connected inside the fixed column 25. One end of the telescopic column 26 is connected to a second stop 23, and a compression spring is provided between the other end and the bottom surface of the inner wall of the fixed column 25. The spring between the fixed column 25 and the telescopic column 26 ensures that when the box door 24 is closed, the second stop 23 always maintains the tendency to extend towards the first stop 22, thereby avoiding gaps between the first stop 22 and the second stop 23, and further preventing the steel ring from swinging on both sides during the rolling process.

[0063] A rolling process for producing a steel ring with equal elongation on both its inner and outer sides, using a rolling mill that produces the same elongation on both sides, includes the following steps:

[0064] Step 1: Grind the weld seam of the laser-welded steel ring until it matches the curvature of the inner and outer surfaces of the steel ring.

[0065] Step 2: Hang the steel ring on the rolling roll and adjust the height of the rolling roll so that the distance between the top surface of the rolling roll and the bottom surface of the fixed roll is equal to the target rolling diameter of the steel ring;

[0066] Step 3: Perform the first rolling of the steel ring, maintain the rolling pressure between the fixed roll and the sliding roll at 150MPa, maintain the rotation speed of the fixed roll at 150r / min, extend the first telescopic rod once every 0.5min, and stop rolling when the rangefinder and thickness gauge simultaneously read the data that the steel ring size is qualified;

[0067] Step 4: Using charcoal and urea in a mass ratio of 1:3 as infiltration agents, the steel ring rolled in Step 3 is placed into an electric furnace for nitrocarburizing. The nitrocarburizing temperature is 620°C, and the temperature is maintained for 3 hours. After being removed from the furnace, the ring is water-quenched.

[0068] Step 5: Perform the second rolling of the steel ring, maintaining the rolling pressure between the fixed roll and the sliding roll at 220MPa, the rotation speed of the fixed roll at 40r / min, and the first telescopic rod extending once every 2 minutes. Stop rolling when the distance measuring instrument and the thickness gauge simultaneously read the data indicating that the steel ring size is qualified.

[0069] Step Six: Place the steel ring obtained from step five rolling into an electric furnace, hold it at 190°C for 6 hours, and then air-cool and quench it after removing it from the furnace.

[0070] The working principle of this invention is as follows: The height of the sliding roller 4 is adjusted so that the distance between the top end of the sliding roller 4 and the bottom end of the fixed roller 3 is equal to the target diameter of the steel ring body 27. The top end of the steel ring body 27 is hung on the sliding roller 4, and the bottom end of the steel ring body 27 is fitted onto the fixed roller 3. At this time, the steel ring body 27 is elliptical, with its major axis vertical and its minor axis horizontal. Then, the second telescopic rod 19 extends, maintaining a set pressure between the lifting roller 5 and the fixed roller 3. The fixed roller 3 rotates at a set speed. The rolling of the steel ring body 27 begins. The rangefinder 13 measures the horizontal diameter of the steel ring body 27 in real time, while the first telescopic rod 17 extends intermittently. The pressure plate 18 presses down the steel ring body 27. When the steel ring body 27 is attached to the pressure table 14, the thickness probe 15 accurately measures the thickness of the steel ring body 27. After the first telescopic rod 17 extends and the thickness gauge 16 completes the thickness detection of the steel ring body 27, the first telescopic rod 17 immediately resets. When the thickness and diameter of the steel ring body 27 meet the standards at the same time, the rolling of the steel ring body 27 is completed.

[0071] Although embodiments of the present invention have been shown and described, these specific embodiments are merely illustrative of the invention and are not intended to limit it. The specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. After reading this specification, those skilled in the art may make modifications, substitutions, and variations to the embodiments as needed without departing from the principles and spirit of the invention, provided that such modifications, substitutions, and variations are within the scope of the claims of the present invention and are protected by patent law.

Claims

1. A rolling mill with equal elongation on both the inner and outer sides of a steel ring, comprising a housing, characterized in that: A mounting platform is located in the center of the housing. A slide rail is installed on the upper part of the mounting platform, and a slide table is slidably connected within the slide rail. A sliding roller is rotatably connected to the slide table. A fixed roller is rotatably connected to the mounting platform directly below the sliding roller. A lifting roller capable of contacting the fixed roller is located at the bottom of the mounting platform. The lifting roller is rotatably connected to a lifting platform. A lifting structure is located at the bottom of the lifting platform. A horizontal distance measuring structure capable of lifting and lowering is located at the center position of the fixed roller and the sliding roller. The distance between the contact surfaces of the fixed roller and the sliding roller with the steel ring is equal to the diameter of the steel ring. Pressure platforms are fixedly connected to both sides of the mounting platform below the fixed roller, and thickness measuring structures facing the steel ring are located on the pressure platforms. A first fixing plate is fixedly connected to the bottom of the slide table. A second fixing plate is located above the fixed roller on the mounting platform. The plate has at least one first toothed belt on the first fixed plate facing the second fixed plate, and at least one second toothed belt on the second fixed plate facing the first fixed plate. The first and second toothed belts are parallel to each other and both pass through a toothed belt box. The teeth of the first and second toothed belts face each other and mesh with the same gear. The toothed belt box is located at the center between the fixed roll and the sliding roll. The toothed belt box is equipped with a distance measuring instrument facing both sides. The top surface of the pressure table is lower than the bottom surface of the fixed roll. The pressure table is equipped with an upward-facing thickness measuring probe. The thickness measuring probe is connected to a thickness measuring instrument via a wire. The thickness measuring instrument is mounted on a mounting platform. The mounting platform is equipped with first telescopic rods facing downward on both sides of the second fixed plate. The bottom end of the first telescopic rod is equipped with a pressure plate facing the pressure table. The projection of the pressure plate onto the pressure table completely covers the thickness measuring probe.

2. The rolling mill with equal elongation on both the inner and outer sides of the steel ring according to claim 1, characterized in that: A second telescopic rod is provided on the mounting platform. A lifting platform is connected to the top of the second telescopic rod. A lifting roller with an axis parallel to the axis of the fixed roller is rotatably connected to the top of the lifting platform. The contact surface between the fixed roller and the lifting roller is also parallel to the axial direction of the lifting roller.

3. The rolling mill with equal elongation on both the inner and outer sides of the steel ring according to claim 1, characterized in that: The box body is equipped with first stop bars on both sides of the mounting platform, and box doors are rotatably connected to both sides of the box body. Second stop bars are connected to the box doors. When the box doors are closed, the projections of the first stop bars and the second stop bars toward the box doors coincide.

4. The rolling mill with equal elongation on both the inner and outer sides of the steel ring according to claim 3, characterized in that: A fixed column is fixedly connected to the door, and a telescopic column is slidably connected inside the fixed column. One end of the telescopic column is connected to a second stop, while a compression spring is provided between the other end and the bottom surface of the inner wall of the fixed column.

5. The rolling mill with equal elongation on both the inner and outer sides of the steel ring according to claim 4, characterized in that: The heights of the fixed roll, sliding roll, and lifting roll are all greater than the height of the steel ring. When the box door is closed, the distance between the first stop bar and the second stop bar is equal to the height of the steel ring.

Images