A device for repairing cracks in steel billet straightening rolls

Abstract

This utility model discloses a device for repairing cracks in a steel billet straightening roll, including a repair table. A rotatable bearing seat is located at the center of the repair table, and a seat hole is located at the center of the bearing seat. The seat hole matches the shaft diameter of the straightening roll. During inspection and repair, the straightening roll is vertically inserted into the seat hole of the bearing seat. A correction assembly is provided on the repair table. The correction assembly includes a support bracket with a movably mounted push rod. The end of the push rod has an arc-shaped shaft support that matches the shaft diameter of the straightening roll. A carbon arc gouging assembly is also provided on the repair table to remove cracks in the cracked area. This utility model features stable operation, high repair accuracy, and good safety.

Description

Technical Field

[0001] This utility model relates to the field of steelmaking technology, specifically to a device for repairing cracks in billet straightening rolls. Background Technology

[0002] Under the long-term influence of rolling forces, thermal stress, and mechanical impacts, fatigue cracks are prone to develop at the joint between the shaft and the roll body in steelmaking leveling machines. If not addressed promptly, these cracks can propagate and lead to shaft-roll separation, causing equipment failure, production interruption, and even equipment and personnel accidents. Currently, the conventional repair method involves laying the roll body flat on the ground, using carbon arc gouging to remove the cracked area, and then manually welding it in. However, this method has several drawbacks: First, the roll body is unstable when horizontally placed, and gouging can easily cause wobbling, leading to inaccurate gouging positioning and potentially incomplete removal of debris deep within the crack, affecting the quality of subsequent welding repairs. Second, since cracks have already formed, the concentricity of the shaft and roll needs to be corrected under the combined effects of rolling forces, thermal stress, and mechanical impacts. Traditional correction methods rely on manual methods using a square or experience, resulting in poor precision. Third, the welding relies on manual fixation, and the welding position is mostly at an overhead or vertical angle. The welder's operating space is narrow, which can easily lead to defects such as incomplete fusion and slag inclusion. In addition, the roller and shaft will roll and shake during welding, which will also affect the welding quality. Utility Model Content

[0003] This invention aims to overcome the deficiencies of existing technologies and provide a device for repairing cracks in steel billet straightening rolls, thereby solving the problems mentioned in the background art.

[0004] To achieve the above objectives, the present invention adopts the following technical solution: A device for repairing cracks in a steel billet straightening roll includes a repair platform. A rotatable bearing seat is located at the center of the repair platform, and a seat hole is located at the center of the bearing seat. The seat hole matches the shaft diameter of the straightening roll. During inspection and repair, the straightening roll is vertically inserted into the seat hole of the bearing seat. A correction assembly is provided on the repair platform. The correction assembly includes a support frame, on which a push rod is movably mounted. An arc-shaped shaft support matching the shaft diameter of the straightening roll is located at the end of the push rod. A carbon arc gouging assembly is also provided on the repair platform to remove cracks in the cracked area.

[0005] The above-mentioned billet straightening roll crack repair device includes a support frame with a vertical slide rail and a slide block, the slide block being able to slide up and down along the slide rail; the slide block having a horizontal sliding hole matching a push rod, the other end of the push rod being connected to a booster assembly; the booster assembly including a nut and a screw matching the nut, the nut being fixed on the slide block, its screw hole being coaxially arranged with the sliding hole on the slide block, one end of the screw passing through the nut and entering the sliding hole on the slide block, and connecting to the push rod, a thrust ball bearing being provided between the screw and the push rod.

[0006] The aforementioned billet straightening roller crack repair device has a size scale on the push rod.

[0007] The above-mentioned steel billet straightening roll crack repair device includes a braking part, which comprises a bracket three and a brake rod. The brake rod end is provided with a brake shoe assembly, which consists of a semi-circular brake shoe one and a brake shoe two. Brake shoe one is installed at the end of the brake rod. Brake shoe one and brake shoe two are provided with matching connecting ears, and the connecting ears are provided with connecting holes. Brake shoe two is movably fixed to brake shoe one by fastening bolts and connecting holes on the connecting ears, thereby realizing the braking of the straightening roll shaft.

[0008] The above-mentioned billet straightening roll crack repair device is further provided with a carbon arc gouging assembly on the repair table. The gouging assembly includes a carbon arc gouging gun, which is mounted on the second support. Beneficial effects

[0009] Compared with the prior art, this invention has the following advantages: Placing the straightening roller vertically on a rotatable bearing of the repair table provides greater stability and higher precision compared to traditional horizontal rotation repair. Furthermore, during rotation, the degree of eccentricity of the straightening roller shaft can be assessed by adjusting the distance between the push rod and the roller shaft, allowing for correction via the push rod. This method offers higher reliability, precision, and safety compared to traditional methods relying on manual tapping. In addition, the braking assembly on the repair table provides stable braking of the straightening roller, improving welding accuracy during manual welding and facilitating surface cleaning. The carbon arc gouging assembly allows for deep and reliable cleaning of cracks on the straightening roller. Attached Figure Description

[0010] The present invention will now be described in further detail with reference to the accompanying drawings.

[0011] Figure 1 This is a schematic diagram of the overall structure of this utility model; Figure 2 This is a partial structural schematic diagram of the present invention; Figure 3 This is another partial structural schematic diagram of this utility model; The labels in the diagram represent: 1. Repair table, 2. Shaft seat, 3. Straightening roller, 4. Support 1, 4-1. Push rod, 4-1-1. Arc-shaped shaft support, 4-2. Slide rail, 4-3. Slide block, 5. Nut, 5-1. Screw, 5-2. Thrust ball bearing, 6. Carbon arc air gouging gun, 7. Support 2, 8. Support 3, 9. Brake rod, 9-1. Brake shoe 1, 9-2. Brake shoe 2, 9-3. Fastening bolt. Detailed Implementation

[0012] The present invention will be further described in detail below with reference to the accompanying drawings and embodiments.

[0013] like Figure 1-3 As shown, this utility model includes a repair table 1. A rotatable bearing seat 2 is centrally located on the repair table 1. The bearing seat 2 has a centrally located seat hole that matches the shaft diameter of a tension roller 3. For tension rollers 3 with stepped shafts, the maximum shaft diameter can be selected to match the seat hole. During inspection and repair, the tension roller 3 is vertically inserted into the seat hole of the bearing seat 2 to facilitate the repair of cracks and damage between the roller body and the shaft. A correction assembly is provided on the repair table 1. The correction assembly includes a support 4, on which a push rod 4-1 is movably mounted. The end of the push rod 4-1 has an arc-shaped shaft support 4-1-1 that matches the shaft diameter of the tension roller 3. The shaft diameter here can be selected from the thinnest part of the stepped shaft; this section is positioned higher to increase the applied torque. A carbon arc gouging assembly is also provided on the repair table 1 to remove cracks. After the carbon arc gouging assembly has cleaned the cracks, it can be replaced with an electric welding assembly for welding repair.

[0014] The correction assembly can be designed as follows: A vertical slide rail 4-2 and a slide block 4-3 are provided on the bracket 4. The slide block 4-3 can slide up and down along the slide rail 4-2. By rotating the straightening roller 3, the eccentricity direction between the axis of the straightening roller 3 and the roller body can be inferred from the distance between the axis of the straightening roller 3 and the push rod 4-1. A locking pin can be provided on the slide block 4-3, which can be locked when the slide block slides along the slide rail 4-2 to an appropriate position. A horizontal sliding hole is provided on the slide block 4-3, which matches the push rod 4-1. The other end of the push rod 4-1 is connected to a pusher assembly. When it is found that the axis of the straightening roller 3 is biased to one side, the pusher assembly can be used to push the push rod 4-1 for correction. The booster assembly includes a nut 5 and a matching screw 5-1. The nut 5 is fixed on the slide block 4-3, and its screw hole is coaxially arranged with the sliding hole on the slide block 4-3. One end of the screw 5-1 passes through the nut 5 and enters the sliding hole on the slide block 4-3, and is connected to the push rod 4-1. A thrust ball bearing 5-2 can be provided between the screw 5-1 and the push rod 4-1. In this way, when the screw 5-1 is rotated, the rotational torque during its rotation will not be transmitted to the pusher 5-1, which is beneficial to the stability of the straightening roller 3.

[0015] To facilitate the detection of the offset between the straightening roller 3 and the shaft, a size scale can be set on the push rod 4-1.

[0016] For cases where the crack between the roller body and the shaft is too large, it may lead to shaft loosening. To facilitate crack cleaning and ensure stability during welding, a braking unit can be installed in the repair device. The braking unit includes a bracket 8 and a brake rod 9. The brake rod 9 has a brake shoe assembly at its end, consisting of a semi-circular brake shoe 9-1 and a brake shoe 9-2. Brake shoe 9-1 is installed at the end of the brake rod 9. Brake shoe 9-1 and brake shoe 9-2 have matching connecting ears with connecting holes. Brake shoe 9-2 is movably fixed to brake shoe 9-1 by fastening bolts 9-3 and connecting holes on the connecting ears, thereby braking the shaft of the straightening roller 3. The braking unit is generally used for handheld welding with a welding torch. It can also be configured to mount the welding torch or welding gun on a relevant bracket for welding. The structure of brake shoe 1 and brake shoe 2 is as follows: the outer layer is a steel semi-circular arc layer, and the inner layer is a braking layer, which can be made of rubber.

[0017] To facilitate air gouging and welding repair, the repair table 1 is also equipped with a carbon arc gouging assembly, which includes a carbon arc gouging gun 6 mounted on a support 7. After carbon arc gouging, the carbon arc gouging gun 6 can be replaced with a welding gun for welding. Whether for carbon arc gouging or welding, the straightening roller 3 can rotate while operating, ensuring good stability.

[0018] Support 2 7 can adopt a cross structure design, consisting of a vertical rod 7-1 and a horizontal rod 7-2. The vertical rod 7-1 is equipped with a guide rail and a matching vertical slider 7-3. The vertical slider 7-3 has a horizontal guide hole, which matches the horizontal rod 7-2, allowing the horizontal rod 7-2 to slide horizontally within the guide hole. A rotating shaft 6-1 is located at the end of the horizontal rod 7-2, through which the carbon arc gouging gun 6 is rotatably mounted. The rotating shaft 6-1 has threads and a locking nut to lock the rotation of the carbon arc gouging gun 6. Support 3 8 can adopt the same structure as support 2 7.

Claims

1. A device for repairing cracks in steel billet straightening rolls, characterized in that, The system includes a repair table (1), a rotatable bearing seat (2) at the center of the repair table (1), a seat hole at the center of the bearing seat (2), the seat hole matching the shaft diameter of the straightening roller (3), and the straightening roller (3) being vertically inserted into the seat hole of the bearing seat (2) during inspection and repair; a correction assembly is provided on the repair table (1), the correction assembly including a support (4), a push rod (4-1) movably provided on the support (4), and an arc-shaped shaft support (4-1-1) matching the shaft diameter of the straightening roller (3) at the end of the push rod (4-1); a carbon arc gouging assembly is also provided on the repair table (1), which can remove cracked areas.

2. The billet straightening roll crack repair device according to claim 1, characterized by, The bracket (4) is provided with a vertical slide rail (4-2) and a slide block (4-3). The slide block (4-3) can slide up and down along the slide rail (4-2). The slide block (4-3) is provided with a horizontal sliding hole, which matches the push rod (4-1). The other end of the push rod (4-1) is connected to a booster assembly. The booster assembly includes a nut (5) and a screw (5-1) that matches the nut. The nut (5) is fixed on the slide block (4-3), and its screw hole is coaxially set with the sliding hole on the slide block (4-3). One end of the screw (5-1) passes through the nut (5) and enters the sliding hole on the slide block (4-3), and is connected to the push rod (4-1). A thrust ball bearing (5-2) is provided between the screw (5-1) and the push rod (4-1).

3. The billet straightening roll crack repair device according to claim 1, characterized by, The push rod (4-1) is provided with a size scale.

4. The billet straightening roll crack repair device according to claim 1, characterized by, The braking part of the repair device includes a bracket three (8) and a brake rod (9). The brake rod (9) is provided with a brake shoe assembly at its end. The brake shoe assembly consists of a semi-circular brake shoe one (9-1) and a brake shoe two (9-2). The brake shoe one (9-1) is installed at the end of the brake rod (9). The brake shoe one (9-1) and the brake shoe two (9-2) are provided with matching connecting ears. The connecting ears are provided with connecting holes. The brake shoe two (9-2) is movably fixed to the brake shoe one (9-1) through the fastening bolt (9-3) and the connecting hole on the connecting ear, so as to brake the shaft of the straightening roller (3).

5. The billet straightening roll crack repair device according to claim 1, characterized by, The repair table (1) is also equipped with a carbon arc gouging assembly, which includes a carbon arc gouging gun (6) and is mounted on the support (7).

Images