Tension regulating device in cold rolling annealing furnace

Abstract

The present application relates to annealing correction device technical field, disclose a kind of tension regulation and control device in cold rolling annealing furnace.The device includes fixed support fixed in the inner wall of annealing furnace, center rotating shaft rotationally arranged on fixed support and double-arm rocker fixed on center rotating shaft;Double-arm rocker two ends are respectively installed first guide roller and second guide roller, so that cold-rolled strip steel forms horizontal conveying path along the surface of two guide rollers.Double-arm rocker lower side is connected with arc guide rail, and arc guide rail is located between two guide rollers and is provided with inner rail groove, and counterweight roller is arranged in inner rail groove.When tension fluctuation makes double-arm rocker deflect, arc guide rail tilts along, counterweight roller moves along rail groove to corresponding side, changes its relative center rotating shaft gravity torque arm, provides follow-up support compensation to strip steel deformation area, to realize non-electric control type tension adjustment under high-temperature environment in furnace.

Description

Technical Field

[0001] This invention relates to the field of annealing straightening devices, and particularly to a tension control device for cold rolling annealing furnaces. Background Technology

[0002] Continuous annealing of cold-rolled strip steel is typically carried out in a high-temperature protective atmosphere to release residual rolling stress and improve microstructure and properties. After being heated in the furnace, the strip steel's stiffness decreases, and localized thermal stress release, uneven tension, or changes in support can all cause strip shape fluctuations. Therefore, the stability of the strip tension within the furnace directly affects the surface quality of the annealed strip and the reliability of its transport.

[0003] Existing continuous annealing lines mostly rely on external tension rollers, correction rollers, or electronically controlled actuators for tension adjustment. Due to the high temperature, limited space, and high requirements for sealing and reliability of the protective atmosphere inside the annealing furnace, it is difficult to place electronically controlled sensors and external drive components inside the furnace for a long time. When local tension fluctuations inside the furnace have caused the strip to sink or bend, relying solely on external adjustment also results in a response lag. Summary of the Invention

[0004] To address the aforementioned problems, this invention provides a tension control device for a cold-rolled annealing furnace, comprising a fixed bracket fixed to the inner wall of the annealing furnace, a central rotating shaft rotatably mounted on the fixed bracket, and a double-arm rocker arm fixed on the central rotating shaft that can horizontally reciprocate as the central rotating shaft rotates; a first guide roller and a second guide roller are rotatably mounted at both ends of the double-arm rocker arm, and the cold-rolled strip is horizontally laid on the top surfaces of the first guide roller and the second guide roller to form a horizontal rolling and conveying path; The double-arm rocker arm is connected to an arc-shaped guide rail, which is located at the bottom of the middle position between the first guide roller and the second guide roller. The arc-shaped guide rail is provided with an inner rail groove, and a counterweight roller is rolled in the inner rail groove. Under normal conditions, the counterweight roller is centered between the first guide roller and the second guide roller, and the counterweight roller is in close contact with and supported on the bottom surface of the cold-rolled strip. When tension fluctuations occur during the operation of cold-rolled strip, the double-arm rocker arm is driven to deflect around the central axis, and the arc-shaped guide rail is simultaneously driven to tilt to one side along with the double-arm rocker arm. This causes the counterweight roller to roll along the inner rail groove towards the tension fluctuation area of ​​the cold-rolled strip, thereby changing the horizontal gravitational moment arm of the counterweight roller relative to the central axis, and thus realizing the dynamic adjustment of the tension deformation of the cold-rolled strip.

[0005] Preferably, the fixed bracket is arranged in an L-shape, and a U-shaped base is fixed in the middle of the inner surface of one of the bent sides of the L-shape, and the central rotating shaft is rotatably mounted on the U-shaped base.

[0006] Preferably, the double-arm rocker arm is located on the front side of the U-shaped base, and a rotation gap is left between it and the front side of the U-shaped base. A torsion spring is connected between the double-arm rocker arm and the U-shaped base. The torsion spring is used to maintain the double-arm rocker arm in a horizontal state under normal operating conditions of cold-rolled strip steel.

[0007] Preferably, the two ends of the double-arm rocker are equipped with shafts, and the first guide roller and the second guide roller are provided with bearing sleeves. The first guide roller and the second guide roller are assembled onto the corresponding shafts through the bearing sleeves.

[0008] Preferably, a transition tread wheel is rotatably mounted in the middle of the double-arm rocker arm, and the transition tread wheel is located between the first guide roller and the second guide roller; the transition tread wheel is used to receive the cold-rolled strip steel introduced by the first guide roller and to roll and convey it to the second guide roller, and under normal conditions, the transition tread wheel and the counterweight roller respectively squeeze the upper and lower surfaces of the cold-rolled strip steel to form a clamping and limiting structure for the strip steel.

[0009] Preferably, the arc-shaped guide rail is curved upwards and disposed on the front side of the U-shaped base. The middle low-position area of ​​the curved shape of the arc-shaped guide rail corresponds to the bottom position of the counterweight roller. The two raised ends of the arc-shaped guide rail are symmetrically arranged with the middle low-position area as the center, and the two raised ends are respectively arranged facing the first guide roller and the second guide roller. The inner rail groove is opened along the arc-shaped contour of the arc-shaped guide rail.

[0010] Preferably, a connecting rod is fixed to the back of the arc-shaped guide rail. The connecting rod is vertically downward and has an adjustment track. A slider is provided on the back of the arc-shaped guide rail. The slider slides and adapts to the adjustment track, so that the arc-shaped guide rail drives the counterweight roller to adjust the clamping gap up and down relative to the transition tread wheel. A locking screw is installed on the slider through a threaded hole. The inner end of the locking screw enters the adjustment track, so that the arc-shaped guide rail achieves self-locking position after adjustment.

[0011] Preferably, the counterweight roller is composed of a wheel axle, unit wheels and guide posts. Two unit wheels are symmetrically rotated at both ends of the wheel axle. The guide post is fixed in the middle of the wheel axle. The guide post is vertically inserted into the inner rail groove and is fitted with a circumferential rotating sleeve that makes rolling contact with the inner rail groove.

[0012] The advantages of this invention compared to existing technologies are as follows: This invention connects an arc-shaped guide rail to a double-arm rocker arm, and sets a rolling counterweight roller in the inner groove of the arc-shaped guide rail. The first guide roller and the second guide roller define the horizontal conveying path of the strip steel. When the strip steel experiences tension fluctuations at either guide position, causing the double-arm rocker arm to deflect, the arc-shaped guide rail tilts accordingly. The counterweight roller moves towards the deflected side under the action of gravity, changing its gravitational moment arm relative to the central axis of rotation, and forming a follow-up support for the bottom surface of the strip steel in the corresponding area, thereby achieving tension compensation without relying on the in-furnace electrical control actuators. The transition treadle and the counterweight roller act on the upper and lower surfaces of the strip steel respectively, which can maintain the basic posture of the strip steel when passing through the device during conveying; the torque linkage between the arc-shaped guide rail, the counterweight roller, and the double-arm rocker arm is used to perform local compensation when tension fluctuations occur, reducing the impact of strip steel sinking and bending on the plate shape under high temperature conditions. Attached Figure Description

[0013] Figure 1 This is a schematic diagram illustrating the working principle of cold-rolled strip steel in accordance with an embodiment of the present invention; Figure 2 The embodiments of the present invention are provided by Figure 1 The resulting top view; Figure 3 The embodiments of the present invention are provided by Figure 1 Leading-in front view plan; Figure 4 This is a three-dimensional schematic diagram of an embodiment of the present invention; Figure 5 The embodiments of the present invention are provided by Figure 4 A schematic diagram of the back plan; Figure 6 This is a schematic diagram showing the arc-shaped guide rail after being cut open according to an embodiment of the present invention.

[0014] In the diagram: 1. Fixed bracket; 2. Central rotating shaft; 3. Double-arm rocker arm; 4. First guide roller; 5. Second guide roller; 6. Arc-shaped guide rail; 7. Counterweight roller; 8. Inner rail groove; 9. Cold-rolled strip steel; 10. U-shaped base; 11. Rotation clearance; 12. Torsion spring; 13. Shaft; 14. Bearing sleeve; 15. Transition tread wheel; 16. Connecting rod; 17. Adjusting track; 18. Slider; 19. Wheel axle; 20. Unit wheel; 21. Guide column; 22. Circumferential rotating sleeve. Detailed Implementation

[0015] The above and other embodiments and advantages of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.

[0016] In one implementation, such as Figures 1-6 As shown: This embodiment provides a tension control device for a cold rolling annealing furnace, including a fixed bracket 1 fixed to the inner wall of the annealing furnace, a central rotating shaft 2 rotatably mounted on the fixed bracket 1, and a double-arm rocker arm 3 fixed on the central rotating shaft 2 that can horizontally reciprocate as the central rotating shaft 2 rotates; a first guide roller 4 and a second guide roller 5 are rotatably mounted at both ends of the double-arm rocker arm 3, and the cold-rolled strip steel 9 is horizontally laid on the top surface of the first guide roller 4 and the second guide roller 5 to form a horizontal rolling and conveying path; The double-arm rocker arm 3 is connected to an arc-shaped guide rail 6. The arc-shaped guide rail 6 is located at the bottom of the middle position between the first guide roller 4 and the second guide roller 5. The arc-shaped guide rail 6 is provided with an inner rail groove 8, and a counterweight roller 7 is rolled in the inner rail groove 8. Under normal conditions, the counterweight roller 7 is centered between the first guide roller 4 and the second guide roller 5, and the counterweight roller 7 is in close contact with and supported on the bottom surface of the cold-rolled strip steel 9; When tension fluctuations occur during the operation of the cold-rolled strip 9, the double-arm rocker arm 3 is driven to deflect around the central axis 2, and the arc-shaped guide rail 6 is simultaneously driven to tilt to one side along with the double-arm rocker arm 3, so that the counterweight roller 7 rolls along the inner rail groove 8 towards the tension fluctuation area of ​​the cold-rolled strip 9, thereby changing the horizontal gravitational moment arm of the counterweight roller 7 relative to the central axis 2, and thus realizing the dynamic adjustment of the tension deformation of the cold-rolled strip 9.

[0017] During installation, the fixed bracket 1 can be fixed at a predetermined position on the inner wall of the annealing furnace, so that the device is located on the furnace conveying path of the cold-rolled strip 9. The length direction of the double-arm rocker arm 3 is roughly consistent with the conveying direction of the strip. The first guide roller 4 is close to the feeding side, and the second guide roller 5 is close to the discharging side. The cold-rolled strip 9 passes through the areas where the first guide roller 4, the transition tread roller 15, and the second guide roller 5 are located in sequence and continues to be conveyed to the discharging end.

[0018] Under normal operating conditions, the cold-rolled strip 9 is fed into the device area by the upstream equipment at a set speed and laid on the roller surfaces of the first guide roller 4 and the second guide roller 5. The counterweight roller 7 is located in the lower middle area of ​​the arc-shaped guide rail 6, with its upper part attached to the bottom surface of the cold-rolled strip 9 to form a reference support; the double-arm rocker arm 3 is kept in an approximately horizontal state under the combined action of the torsion spring 12 and the strip.

[0019] When the strip on one side sinks or bends due to uneven tension during high-temperature annealing, the downward pressure on the corresponding guide roller increases, and the double-arm rocker arm 3 deflects slightly towards that side around the central axis 2. After the arc-shaped guide rail 6 tilts in the same direction as the double-arm rocker arm 3, the counterweight roller 7 moves towards a lower position along the inner rail groove 8 under its own weight, gradually approaching the area of ​​the sinking strip. Since the two sides of the arc-shaped guide rail 6 are raised, when the counterweight roller 7 moves towards that side, its support position is closer to the corresponding guide roller, which can provide upper support to the bottom surface of the strip closer to the deformation position, thereby mitigating the sinking and bending at that point.

[0020] Once the strip steel is subjected to balanced forces, the double-arm rocker arm 3 returns to its initial position under the combined action of the torsion spring 12 and the counterweight roller 7. The counterweight roller 7 then returns to the middle region of the arc-shaped guide rail 6 along the inner rail groove 8, and the device returns to its normal support state.

[0021] The above adjustment process is triggered by the change in the force on the strip, and does not require the placement of electrical detection components or external driving components inside the furnace. It uses the change in gravitational torque between the double-arm rocker arm 3, the arc-shaped guide rail 6 and the counterweight roller 7 for compensation, which is suitable for working conditions where it is inconvenient to place electrical control mechanisms inside a high-temperature furnace.

[0022] Specifically, the fixed bracket 1 is arranged in an L-shape, with a U-shaped base 10 fixed to the middle of the inner surface of one of the bent sides of the L-shape. The central rotating shaft 2 is rotatably mounted on the U-shaped base 10. The fixed bracket 1 adopts an L-shaped bent structure, which facilitates fixation to the inner wall of the furnace and provides an installation plane for the U-shaped base 10. The central rotating shaft 2 is mounted inside the U-shaped base 10, and the U-shaped base 10 provides rotational support and lateral limit for the central rotating shaft 2, allowing the double-arm rocker arm 3 to swing with the central rotating shaft 2 as a reference.

[0023] Specifically, the double-arm rocker arm 3 is located on the front side of the U-shaped base 10, with a rotational clearance 11 between it and the front side of the U-shaped base 10. A torsion spring 12 connects the double-arm rocker arm 3 and the U-shaped base 10. The torsion spring 12 is used to maintain the double-arm rocker arm 3 in a horizontal state under normal operating conditions of the cold-rolled strip 9. The rotational clearance 11 provides space for the reciprocating deflection of the double-arm rocker arm 3, preventing it from interfering with the U-shaped base 10. The torsion spring 12 provides a reset torque, enabling the double-arm rocker arm 3 to maintain a horizontal reference position when there is no significant unilateral tension fluctuation, and drives the mechanism to return to its original position after the compensation action is completed.

[0024] Specifically, the two ends of the double-arm rocker arm 3 are equipped with shafts 13, and the first guide roller 4 and the second guide roller 5 are provided with bearing sleeves 14. The first guide roller 4 and the second guide roller 5 are assembled onto the corresponding shafts 13 through the bearing sleeves 14. The shafts 13 serve as support components for the first guide roller 4 and the second guide roller 5, and the bearing sleeves 14 are used to reduce the rotational resistance of the guide rollers when they move with the strip, thereby reducing drag and abrasion between the roller surface and the strip.

[0025] Specifically, a transition tread wheel 15 is rotatably mounted in the middle of the double-arm rocker arm 3, and the transition tread wheel 15 is located between the first guide roller 4 and the second guide roller 5. The transition tread wheel 15 is used to receive the cold-rolled strip steel 9 introduced by the first guide roller 4 and to roll and convey it to the second guide roller 5. Under normal conditions, the transition tread wheel 15 and the counterweight roller 7 respectively press the upper and lower surfaces of the cold-rolled strip steel 9, forming a clamping and limiting structure for the strip steel. The transition tread wheel 15 and the counterweight roller 7 are arranged vertically opposite each other, so that the cold-rolled strip steel 9 is subject to limited clamping in this area, which not only maintains the conveying posture, but also provides a contact basis for the subsequent movement of the counterweight roller 7.

[0026] Using the transition tread wheel 15 as the dividing line, the area where the strip passes through this device can be divided into the left compensation area between the first guide roller 4 and the transition tread wheel 15, and the right compensation area between the second guide roller 5 and the transition tread wheel 15; the counterweight roller 7 moves to the corresponding area according to the deflection direction of the double-arm rocker arm 3.

[0027] When the cold-rolled strip 9 experiences localized sinking or bending between the first guide roller 4 and the transition tread roller 15, the force exerted by the strip on that side on the first guide roller 4 increases, causing the double-arm rocker arm 3 to deflect to the leftward compensation zone. The arc-shaped guide rail 6 then tilts to the left, and the counterweight roller 7 moves along the inner rail groove 8 to the left and approaches below the first guide roller 4, providing upward support to the bottom surface of the strip in the leftward compensation zone. As the force at this point returns to equilibrium, the double-arm rocker arm 3 returns to its normal position, and the counterweight roller 7 returns to the middle position of the arc-shaped guide rail 6.

[0028] When the cold-rolled strip 9 experiences a similar sinking or bending between the second guide roller 5 and the transition treadle 15, the double-arm rocker arm 3 deflects to the right compensation zone, the arc-shaped guide rail 6 tilts to the right, and the counterweight roller 7 moves below the second guide roller 5, providing support to the bottom surface of the strip within the right compensation zone. After this lateral deformation weakens, the mechanism resets under the gravity of the torsion spring 12 and the counterweight roller 7.

[0029] Specifically, the arc-shaped guide rail 6 is curved upwards and positioned on the front side of the U-shaped base 10. The lower middle region of the curved shape of the arc-shaped guide rail 6 corresponds to the bottom position of the counterweight roller 7. The two raised ends of the arc-shaped guide rail 6 are symmetrically arranged with the lower middle region as the center, and the two raised ends are respectively arranged facing the first guide roller 4 and the second guide roller 5. The inner rail groove 8 is opened along the arc-shaped contour of the arc-shaped guide rail 6. The arc-shaped guide rail 6 adopts an arc-shaped structure with a low middle and high sides, which makes it easy for the counterweight roller 7 to stay at the middle reference position under normal conditions. When the arc-shaped guide rail 6 tilts with the double-arm rocker arm 3, the counterweight roller 7 can roll along the inner rail groove 8 to the lower side and gradually approach the strip steel area below the corresponding guide roller. This structure makes the moving direction of the counterweight roller 7 match the deflection direction of the double-arm rocker arm 3.

[0030] Specifically, a connecting rod 16 is fixed to the back of the arc-shaped guide rail 6. The connecting rod 16 is vertically downward and has an adjustment track 17. A slider 18 is provided on the back of the arc-shaped guide rail 6. The slider 18 slides and fits into the adjustment track 17, so that the arc-shaped guide rail 6 can drive the counterweight roller 7 to adjust the clamping gap with the transition tread wheel 15. A locking screw is installed on the slider 18 through a threaded hole. The inner end of the locking screw enters into the adjustment track 17, so that the arc-shaped guide rail 6 can achieve position self-locking after adjustment.

[0031] The back of the arc-shaped guide rail 6 is connected to the slider 18 via a connecting rod 16. The slider 18 can move up and down along the adjusting track 17, thereby changing the height position of the arc-shaped guide rail 6 and the counterweight roller 7 relative to the transition tread wheel 15. Through this adjustment structure, the clamping gap can be set according to the thickness of the cold-rolled strip steel 9. After adjustment, the locking screw is tightened against the adjusting track 17 to keep the arc-shaped guide rail 6 at the set height.

[0032] Specifically, the counterweight roller 7 is composed of a wheel axle 19, unit wheels 20 and guide posts 21. Two unit wheels 20 are symmetrically connected to both ends of the wheel axle 19. A guide post 21 is fixed in the middle of the wheel axle 19. The guide post 21 is vertically inserted into the inner rail groove 8 and is fitted with a circumferential rotating sleeve 22 that rolls in contact with the inner rail groove 8.

[0033] The counterweight roller 7 adopts a combination structure of axle 19, two unit wheels 20, and central guide post 21. The two unit wheels 20 respectively contact the bottom surface of the strip steel, which can distribute the support pressure and reduce the risk of local indentation; the guide post 21 extends into the inner rail groove 8, and the circumferential rotating sleeve 22 rolls with the rail groove, so that the counterweight roller 7 has less resistance when moving in the arc trajectory, reducing jamming.

[0034] It should be further noted that when the cold-rolled strip 9 passes through the area of ​​this device, it can adopt a low-speed steady-state operation mode, so that the strip has a corresponding residence time in the furnace within the clamping zone. The fixed support 1, double-arm rocker arm 3, arc-shaped guide rail 6, counterweight roller 7 and related connecting parts in the device can be made of heat-resistant alloy materials to adapt to the high temperature and protective atmosphere environment in the annealing furnace, and reduce deformation, oxidation and changes in fit clearance during long-term use.

[0035] The above orientation references do not represent the specific orientations of each component in this implementation scheme. This implementation scheme is only for the convenience of describing the scheme and to make relative descriptions based on the orientations referenced. In reality, the specific orientations of each component are based on their actual installation and use, as well as the orientation descriptions that are customary to those skilled in the art. This is hereby stated.

[0036] The specific embodiments described above further illustrate the inventive purpose, technical solution, and beneficial effects of the present invention. It should be understood that the above descriptions are merely specific embodiments of the present invention and are not intended to limit the scope of protection of the present invention. In particular, it should be noted that any modifications, equivalent substitutions, or improvements made by those skilled in the art within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A tension control device for a cold rolling annealing furnace, characterized in that, The system includes a fixed bracket (1) fixed to the inner wall of the annealing furnace, on which a central rotating shaft (2) is rotatably mounted. A double-arm rocker arm (3) is fixed on the central rotating shaft (2) and can swing horizontally back and forth when rotating with the central rotating shaft (2). A first guide roller (4) and a second guide roller (5) are rotatably mounted at both ends of the double-arm rocker arm (3). Cold-rolled strip steel (9) is horizontally laid on the top surface of the first guide roller (4) and the second guide roller (5) to form a horizontal rolling and conveying path. The double-arm rocker arm (3) is connected to an arc-shaped guide rail (6). The arc-shaped guide rail (6) is located at the bottom of the middle position between the first guide roller (4) and the second guide roller (5). The arc-shaped guide rail (6) is provided with an inner rail groove (8). A counterweight roller (7) is rolled in the inner rail groove (8). In normal conditions, the counterweight roller (7) is centered between the first guide roller (4) and the second guide roller (5), and the counterweight roller (7) is attached to and supported on the bottom surface of the cold-rolled strip (9); When tension fluctuations occur during the operation of the cold-rolled strip (9), the double-arm rocker arm (3) is driven to deflect around the central axis (2), and the arc-shaped guide rail (6) is driven to tilt to one side along with the double-arm rocker arm (3), so that the counterweight roller (7) rolls along the inner rail groove (8) towards the tension fluctuation area of ​​the cold-rolled strip (9), thereby changing the horizontal gravitational moment arm of the counterweight roller (7) relative to the central axis (2), and thus realizing the dynamic adjustment of the tension deformation of the cold-rolled strip (9).

2. The tension control device in the cold rolling annealing furnace according to claim 1, characterized in that, The fixed bracket (1) is arranged in an L-shape, and a U-shaped base (10) is fixed in the middle of the inner surface of one of the L-shaped bends. The central rotating shaft (2) is rotatably mounted on the U-shaped base (10).

3. The tension control device in the cold rolling annealing furnace according to claim 2, characterized in that, The double-arm rocker arm (3) is located on the front side of the U-shaped base (10) and has a rotation gap (11) between it and the front side of the U-shaped base (10). A torsion spring (12) is connected between the double-arm rocker arm (3) and the U-shaped base (10). The torsion spring (12) is used to maintain the double-arm rocker arm (3) in a horizontal state under normal operating conditions of cold-rolled strip (9).

4. The tension control device in the cold rolling annealing furnace according to claim 3, characterized in that, The two ends of the double-arm rocker arm (3) are equipped with shafts (13), and the first guide roller (4) and the second guide roller (5) are provided with bearing sleeves (14). The first guide roller (4) and the second guide roller (5) are assembled on the corresponding shafts (13) through the bearing sleeves (14).

5. The tension control device in the cold rolling annealing furnace according to claim 4, characterized in that, A transition tread wheel (15) is rotatably mounted in the middle of the double-arm rocker arm (3). The transition tread wheel (15) is located between the first guide roller (4) and the second guide roller (5). The transition tread wheel (15) is used to receive the cold-rolled strip steel (9) introduced by the first guide roller (4) and to roll and convey it to the second guide roller (5). Under normal conditions, the transition tread wheel (15) and the counterweight roller (7) respectively squeeze the upper and lower surfaces of the cold-rolled strip steel (9) to form a clamping and limiting structure for the strip steel.

6. The tension control device in the cold rolling annealing furnace according to claim 5, characterized in that, The arc-shaped guide rail (6) is bent upwards and disposed on the front side of the U-shaped base (10). The middle low area of ​​the curved shape of the arc-shaped guide rail (6) corresponds to the bottom position of the counterweight roller (7). The two raised ends of the arc-shaped guide rail (6) are symmetrically arranged with the middle low area as the center, and the two raised ends are respectively arranged facing the first guide roller (4) and the second guide roller (5). The inner rail groove (8) is opened along the arc-shaped contour of the arc-shaped guide rail (6).

7. The tension control device in the cold rolling annealing furnace according to claim 6, characterized in that, A connecting rod (16) is fixed on the back of the arc-shaped guide rail (6). The connecting rod (16) is vertically downward and has an adjustment track (17). A slider (18) is provided on the back of the arc-shaped guide rail (6). The slider (18) slides and adapts to the adjustment track (17), so that the arc-shaped guide rail (6) drives the counterweight roller (7) to adjust the clamping gap up and down relative to the transition tread wheel (15). A locking screw is installed on the slider (18) through a threaded hole. The inner end of the locking screw enters the adjustment track (17), so that the arc-shaped guide rail (6) can achieve position self-locking after adjustment up and down.

8. The tension control device in the cold rolling annealing furnace according to claim 7, characterized in that, The counterweight roller (7) is composed of a wheel axle (19), unit wheels (20) and guide post (21). Two unit wheels (20) are symmetrically connected to both ends of the wheel axle (19). The guide post (21) is fixed in the middle of the wheel axle (19). The guide post (21) is vertically inserted into the inner rail groove (8) and is fitted with a circumferential rotating sleeve (22) that rolls in contact with the inner rail groove (8).

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