Die expanding device of rib rolling machine

Abstract

The utility model discloses a mould expanding device of a rib rolling machine, which relates to the technical field of inner cylinder processing and comprises a base, a rotating cylinder is arranged at the upper end of the base, a plurality of positioning blocks are arranged on the outer side of the rotating cylinder and arranged along the circumferential direction of the rotating cylinder, corresponding arc-shaped plates are arranged at one ends, far away from the rotating cylinder, of the positioning blocks, and the arc-shaped plates are attached to the inner wall of the inner cylinder. Positioning grooves are formed in the positioning blocks, inclined rods are arranged at the two ends of each positioning block and are telescopic, clamping rods corresponding to the positioning blocks one to one are fixedly arranged on the sides, close to the positioning blocks, of the arc-shaped plates, the clamping rods are inserted into the positioning grooves, guide faces are fixedly arranged at the ends, away from the arc-shaped plates, of the clamping rods, the guide faces guide the inclined rods, and guide rings are arranged on the outer sides of the clamping rods. A telescopic assembly is arranged at the upper end of the rotating cylinder and used for driving the positioning block to move, and a rotating piece is arranged at the lower end of the rotating cylinder and used for driving the rotating cylinder to rotate. The mold expanding device has the effect of improving the use convenience of the mold expanding device.

Description

Technical Field

[0001] This utility model relates to the field of inner cylinder processing technology, and in particular to a mold expansion device for a rolling machine. Background Technology

[0002] In the production process of the inner drum of a fully automatic washing machine, sheet-like raw materials are usually bent into a cylindrical shape, and then the two ends are connected by welding or other connection methods to form the inner drum body. In order to improve the supporting strength of the inner drum body, the inner drum body is fixed by an expansion film device, and rollers roll and squeeze on its surface to form concave and convex ribs.

[0003] Related technology can be found in Chinese Patent No. CN221675567U, which discloses a drum-type washing machine inner drum expansion device. The device includes an expansion device body, which is fixedly mounted on an expansion platform. The bottom of the expansion platform is fixed by support legs, and the outer side of the expansion device body wraps around the inner drum body. The expansion device body includes a positioning seat, and a first expansion plate is movably mounted inside the positioning seat. A second expansion plate is mounted on one side of the first expansion plate, a third expansion plate is mounted on the upper left side of the second expansion plate, and a fourth expansion plate is mounted on the upper side of the third expansion plate. A drive disc is movably mounted on the lower inside of the positioning seat, and four sets of drive ports are evenly distributed on the drive disc. This drum-type washing machine inner drum expansion device uses four sets of expansion plates combined to form a circle, uniformly expanding and stretching the inner wall of the bottom of the inner drum body, ensuring the quality of the inner drum body after expansion and preventing deformation, resulting in a complete circular cross-section.

[0004] Regarding the aforementioned technologies, the expansion mold and expansion device are an integral structure. However, due to the differences in the dimensions of different inner cylinders, the expansion mold is not versatile enough and cannot adapt to inner cylinders of various sizes. The only way to match the inner cylinder size is to replace the entire expansion device, which increases the complexity of operation and time cost, making the expansion device inconvenient to use. Utility Model Content

[0005] To improve the ease of use of the bulging device, this application provides a bulging device for a rolling machine.

[0006] This application provides a mold expansion device for a rolling machine, which adopts the following technical solution:

[0007] A rolling mill expansion device includes a base, a rotating cylinder at the upper end of the base, and a plurality of positioning blocks on the outer side of the rotating cylinder. The positioning blocks are arranged circumferentially around the rotating cylinder. A corresponding arc-shaped plate is provided at the end of the positioning block away from the rotating cylinder. The arc-shaped plate fits against the inner wall of the inner cylinder. A positioning groove is opened in the positioning block. Inclined rods are provided at both ends of the positioning blocks. The inclined rods are telescopically oriented. A corresponding locking rod is fixed on the side of the arc-shaped plate near the positioning block. The locking rod is inserted into the positioning groove. A guide surface is fixed on the end of the locking rod away from the arc-shaped plate. The guide surface guides the inclined rod. A guide ring is provided on the outer side of the locking rod. The guide ring is slidably connected to the locking rod along the length direction of the locking rod. A telescopic component is provided at the upper end of the rotating cylinder. The telescopic component is used to drive the positioning blocks to move. A rotating component is provided at the lower end of the rotating cylinder. The rotating component is used to drive the rotating cylinder to rotate.

[0008] By adopting the above technical solution, the telescopic component drives the positioning block to move, and the movement of the positioning block drives the movement of the arc plate, realizing the expansion and contraction of the arc plate, so that the arc plate is tightly attached to the inner cylinder. The rotating component starts to drive the rotating cylinder to rotate, the rotation of the rotating cylinder drives the positioning block to rotate, the rotation of the positioning block drives the arc plate to rotate, and the rotation of the arc plate drives the inner cylinder to rotate, realizing the processing of the inner cylinder. When the clamping rod is inserted into the positioning groove, the guide surface can guide the tilting rod to extend and retract, which facilitates the insertion and locking of the clamping rod and enhances the connection stability. When it is necessary to replace the arc plate, the clamping rod is moved, and the guide ring guides the tilting rod to contact the guide surface of the clamping rod. After the tilting rod contacts the guide surface of the clamping rod, the tilting rod extends and retracts, which separates the tilting rod from the clamping rod, thus facilitating the replacement of the arc plate and making the arc plate adaptable to inner cylinders of different sizes, improving the convenience of using the expansion mold device.

[0009] Optionally, the telescopic assembly includes a cylinder, a connecting cylinder, a lifting rod, and several hinge rods. The cylinder is located at the upper end of the rotating cylinder. The lifting rod is coaxially fixed with the output end of the cylinder. The connecting cylinder is located inside the rotating cylinder and is fixedly connected to the lifting rod. Several hinge rods are evenly distributed around the circumference of the connecting cylinder and are hinged to the connecting cylinder. A positioning plate is provided at the end of the hinge rod away from the connecting cylinder. The positioning plate is hinged to the hinge rod. A positioning block is fixed at the end of the positioning plate away from the hinge rod. Several hinge rods are provided on the outside of the rotating cylinder. The hinge rods are hinged to the rotating cylinder. The end of the hinge rod away from the rotating cylinder is hinged to the positioning plate.

[0010] By adopting the above technical solution, the cylinder one starts and drives the lifting rod to rise and fall, the lifting rod rises and falls and drives the connecting cylinder to rise and fall, the hinge rod one achieves extension and retraction under the limiting action of the hinge rod two, the extension and retraction of the hinge rod one drives the arc plate to extend and retract, realizes the mold expansion function, and improves the convenience of using the mold expansion device.

[0011] Optionally, a number of sliders are fixed on the outside of the connecting cylinder, and a groove corresponding to each slider is opened inside the rotating cylinder. The slider is located in the groove and is slidably connected to the rotating cylinder in the vertical direction.

[0012] By adopting the above technical solution, when the connecting cylinder moves vertically, it drives the slider to slide vertically in the groove of the rotating cylinder, which can ensure that the moving direction of the connecting cylinder is more stable and accurate, making the movement of the telescopic component more stable and reliable, thereby improving the stability and reliability of the expansion device.

[0013] Optionally, the rotating component includes a motor and a rotating plate. The motor is fixed to the upper end of the base, and the rotating plate is fixed to the output shaft of the motor. The end of the rotating plate away from the motor is bolted to the rotating drum.

[0014] By adopting the above technical solution, the motor starts and drives the rotating plate to rotate, the rotating plate drives the rotating drum to rotate, the rotating drum drives the arc plate to rotate, and the arc plate drives the inner cylinder to rotate, thereby realizing the processing of the inner cylinder.

[0015] Optionally, the tilting rod includes a connecting rod, a tilting block, and an elastic element. The connecting rod is fixed inside the positioning block, and the tilting block is located at the end of the connecting rod near the locking rod. The tilting block is slidably connected to the connecting rod along the length direction of the connecting rod. The tilting block tilts from top to bottom towards the connecting rod. The elastic element is located between the connecting rod and the tilting block. The elastic element is used to drive the tilting block to slide along the length direction of the connecting rod.

[0016] By adopting the above technical solution, the tilting block can slide along the length of the connecting rod. In conjunction with the guide surface of the clamping rod, the tilting rod can be guided. At the same time, the elastic element can drive the tilting block to slide along the length of the connecting rod, ensuring good contact between the tilting block and the clamping rod. This makes the connection between the arc plate and the positioning block more stable and reliable, which is conducive to the normal operation of the expansion device.

[0017] Optionally, the positioning block is provided with a push rod corresponding to the tilting block. The push rod is slidably connected to the positioning block along the width direction of the positioning block and abuts against the tilting block. A fixing nut is provided at the end of the push rod away from the tilting block, and the fixing nut is threadedly connected to the push rod.

[0018] By adopting the above technical solution, after the tilting rod and the locking rod are engaged, the sliding push rod is made to press against the locking rod, and the fixing nut is rotated to position the push rod, thereby controlling the position of the tilting block and ensuring the stability of the tilting rod's guiding and connecting functions to the locking rod.

[0019] Optionally, a fixing plate is fixedly provided at the upper end of the arc-shaped plate, and a baffle is provided at the end of the fixing plate away from the fixing plate. The baffle is slidably connected to the fixing plate in a vertical direction. The baffle is provided with a guide surface, which is used to guide the inner cylinder to fit into the arc-shaped plate. An elastic element is fixedly provided between the fixing plate and the baffle.

[0020] By adopting the above technical solution, after the guide surface on the baffle contacts the inner cylinder, a lateral thrust is applied to the inserted inner cylinder during the vertical sliding process, forcing the inner cylinder to move towards the side of the arc plate, and finally achieving a tight fit between the two. This guides the inner cylinder to fit with the arc plate, which is convenient for the inner cylinder processing. The second elastic element provides elastic force when the baffle slides and can also buffer the impact force during the fitting process, reducing the probability of structural damage caused by rigid collision of the inner cylinder.

[0021] Optionally, a support plate is fixed at the lower end of the base, and cylinders are fixed at both ends of the support plate. The output end of cylinder is coaxially fixed with the base. Limiting blocks are slidably connected at both ends of the support plate. The limiting blocks are used to limit the inner cylinder. The limiting blocks have arc-shaped surfaces that fit against the outer wall of the inner cylinder.

[0022] By adopting the above technical solution, the support plate at the lower end of the base can play a supporting role. The cylinder two drives the base to adjust its vertical position. The limiting blocks at both ends of the support plate can use their arc surfaces to fit against the outer wall of the inner cylinder to limit the inner cylinder and ensure that the inner cylinder is in the appropriate position.

[0023] In summary, this application includes at least one of the following beneficial technical effects:

[0024] 1. When it is necessary to replace the arc plate, move the clamp rod. After the guide ring guides the tilting rod to contact the guide surface of the clamp rod, the tilting rod extends and retracts, separating the tilting rod from the clamp rod. This makes it easier to replace the arc plate, allowing the arc plate to be adapted to inner cylinders of different sizes, and improving the convenience of using the expansion mold device.

[0025] 2. When the connecting cylinder moves vertically, it drives the slider to slide vertically in the groove of the rotating cylinder, which can ensure that the movement direction of the connecting cylinder is more stable and accurate, making the movement of the telescopic component more stable and reliable, thereby improving the stability of the expansion device.

[0026] 3. The support plate at the lower end of the base can provide support, and the second cylinder drives the base to adjust its vertical position, improving the flexibility of the device. Attached Figure Description

[0027] Figure 1 This is a schematic diagram of the overall structure of the expansion device of a rolling machine.

[0028] Figure 2 This is a cross-sectional schematic diagram designed to highlight the rotating drum connection structure.

[0029] Figure 3 This is a cross-sectional schematic diagram designed to highlight the connection structure of the positioning blocks.

[0030] Explanation of reference numerals in the attached drawings: 1. Base; 11. Motor; 111. Rotating plate; 12. Rotating cylinder; 121. Connecting cylinder; 1211. Slider; 122. Positioning plate; 123. Positioning block; 1231. Positioning groove; 1232. Locking rod; 1233. Guide surface; 1234. Guide ring; 1235. Connecting rod; 1236. Inclined block; 1237. Elastic element one; 1238. Push rod; 1239. Fixing nut; 124. Arc plate; 1241. Fixing plate; 1242. Elastic element two; 1243. Baffle; 125. Hinge rod one; 126. Hinge rod two; 127. Cylinder one; 128. Lifting rod; 13. Support plate; 131. Limiting block; 132. Cylinder two; 133. Arc surface; 2. Inner cylinder. Detailed Implementation

[0031] The present application will be further described in detail below with reference to all the accompanying drawings.

[0032] This application discloses a mold expansion device for a rolling machine. Example

[0033] Reference Figure 1 and Figure 2 A rolling mill expansion device includes a base 1, with a motor 11 fixedly mounted on the upper end of the base 1. A rotating plate 111 is mounted on the output shaft of the motor 11. The motor 11 starts and drives the rotating plate 111 to rotate. A rotating cylinder 12 is mounted on the upper end of the rotating plate 111, and the rotating cylinder 12 is bolted to the rotating plate 111, providing high connection strength and facilitating maintenance and replacement. The rotation of the rotating plate 111 drives the rotating cylinder 12 to rotate. A telescopic assembly is mounted on the upper end of the rotating cylinder 12. The telescopic assembly includes a cylinder 127, a connecting cylinder 121, a lifting rod 128, and several hinge rods 125. The cylinder 127 is located on the upper end of the rotating cylinder 12, and the lifting rods 128 are coaxially fixed to the output end of the cylinder 127. Cylinder 127 starts and drives the lifting rod 128 to rise and fall. Connecting cylinder 121 is located inside rotating cylinder 12 and is fixedly connected to lifting rod 128. Lifting rod 128 rises and falls, driving connecting cylinder 121 to rise and fall. Several hinge rods 125 are evenly distributed around the circumference of connecting cylinder 121 and are hinged to connecting cylinder 121. The end of hinge rod 125 away from connecting cylinder 121 is provided with a corresponding positioning plate 122. Positioning plate 122 is hinged to hinge rod 125. Several hinge rods 126 are provided on the outside of rotating cylinder 12. Hinged rods 126 are hinged to rotating cylinder 12. The end of hinge rod 126 away from rotating cylinder 12 is hinged to positioning plate 122.

[0034] Reference Figure 1 and Figure 2The first hinge rod 125 extends and retracts under the limiting action of the second hinge rod 126. The extension and retraction of the first hinge rod 125 drives the extension and retraction of the positioning plate 122. Two positioning blocks 123 are fixed on the side of the positioning plate 122 away from the first hinge rod 125. The two positioning blocks 123 are located at both ends of the positioning plate 122. The extension and retraction of the positioning plate 122 drives the extension and retraction of the positioning blocks 123. An arc plate 124 is provided on the side of the positioning block 123 away from the positioning plate 122. The arc plate 124 is detachably connected to the positioning block 123. The extension and retraction of the positioning block 123 drives the arc plate 124 to expand and contract, so that the arc plate 124 fits against the inner cylinder 2.

[0035] Reference Figure 1 and Figure 2 The rotation of the rotating drum 12 drives the positioning plate 122 to rotate, the rotation of the positioning plate 122 drives the positioning block 123 to rotate, the rotation of the positioning block 123 drives the arc plate 124 to rotate, and the rotation of the arc plate 124 drives the inner cylinder 2 to rotate, which facilitates the processing of the inner cylinder 2 and improves the convenience of using the device.

[0036] Reference Figure 2 and Figure 3 The arc plate 124 is provided with a corresponding locking rod 1232 on the side near the positioning block 123. The locking rod 1232 is provided with a guide surface 1233. The positioning block 123 is provided with a positioning groove 1231. Both ends of the positioning block 123 are provided with inclined rods. The inclined rods include a connecting rod 1235, an inclined block 1236 and an elastic element 1237. The connecting rod 1235 is fixed in the positioning block 123. The inclined block 1236 is located at the end of the connecting rod 1235 near the locking rod 1232. The inclined block 1236 is slidably connected to the connecting rod 1235 along the length direction of the connecting rod 1235. The inclined block 1236 is inclined from top to bottom towards the connecting rod 1235. The elastic element 1237 is located between the connecting rod 1235 and the inclined block 1236. When the locking rod 1232 is inserted into the positioning groove 1231, the guide surface 1233 guides the inclined rod to extend and retract, so that the inclined block 1236 can lock the locking rod 1232.

[0037] Reference Figure 2 and Figure 3 A guide ring 1234 is provided on the outer side of the clamping rod 1232. The guide ring 1234 is slidably connected to the clamping rod 1232 along the length direction of the clamping rod 1232. When disassembling, the clamping rod 1232 is moved. After the clamping rod 1232 contacts the guide ring 1234, the tilting rod retracts and separates from the clamping rod 1232 under the action of the guide ring 1234, thereby realizing the disassembly of the positioning block 123 and the arc plate 124. This facilitates the replacement of the arc plate 124 to adapt to the inner cylinder 2 of different sizes, and improves the convenience of using the device.

[0038] Reference Figure 1 and Figure 2A number of sliders 1211 are fixed on the outside of the connecting cylinder 121. The rotating cylinder 12 has a groove corresponding to each slider 1211. The sliders 1211 are located in the groove. When the connecting cylinder 121 moves vertically, it drives the sliders 1211 to slide vertically in the groove of the rotating cylinder 12. This ensures that the moving direction of the connecting cylinder 121 is more stable and accurate, making the movement of the device smoother and more reliable, thereby improving the stability and reliability of the expansion device.

[0039] Reference Figure 2 The positioning block 123 is provided with a push rod 1238 corresponding to the tilting block 1236. The push rod 1238 is slidably connected to the positioning block 123 along the width direction of the positioning block 123. When the tilting rod is engaged with the locking rod 1232, the push rod 1238 is slid to abut against the locking rod 1232. The end of the push rod 1238 away from the tilting block 1236 is provided with a fixing nut 1239, and the fixing nut 1239 is threadedly connected to the push rod 1238. After the push rod 1238 abuts against the tilting block 1236, the fixing nut 1239 is rotated to position the push rod 1238, thereby controlling the position of the tilting block 1236 and ensuring the stability of the tilting rod's guiding and connecting function to the locking rod 1232.

[0040] Reference Figure 2 A support plate 13 is fixedly provided at the lower end of the base 1. Cylinder 132 is fixedly provided at both ends of the support plate 13. The output end of cylinder 132 is coaxially fixed with the base 1. The support plate 13 supports cylinder 132. When cylinder 132 is started, it drives the base 1 to rise and fall, which facilitates the adjustment of the position of the base 1 and improves the flexibility of the device. Limiting blocks 131 are slidably connected at both ends of the support plate 13. Limiting blocks 131 are used to limit the inner cylinder 2. Limiting blocks 131 have an arc surface 133. The arc surface 133 fits against the outer wall of the inner cylinder 2 to limit the inner cylinder 2 and ensure that the inner cylinder 2 is in a suitable position.

[0041] Reference Figure 2 A fixed plate 1241 is fixedly provided at the upper end of the arc plate 124. A baffle 1243 is provided at the end of the fixed plate 1241 away from the fixed plate 1241. The baffle 1243 is slidably connected to the fixed plate 1241 in a vertical direction. The baffle 1243 is provided with a guide surface, which is used to guide the inner cylinder 2 to fit with the arc plate 124. An elastic element 2 1242 is fixed between the fixed plate 1241 and the baffle 1243. After the guide surface on the baffle 1243 contacts the inner cylinder 2, the elastic element 2 1242 compresses the baffle 1243 to slide vertically, and applies a lateral thrust to the inserted inner cylinder 2, forcing the inner cylinder 2 to move towards one side of the arc plate 124, so that the two fit tightly together. This guides the inner cylinder 2 to fit with the arc plate 124. Then the elastic element 2 1242 drives the baffle 1243 to reset, which facilitates the processing of the inner cylinder 2.

[0042] The implementation principle of the expansion device of the rolling mill according to an embodiment of this application is as follows: Cylinder 127 starts, driving the lifting rod 128 to rise and fall. The rising and falling of the lifting rod 128 drives the connecting cylinder 121 to rise and fall. The expansion and contraction of the arc plate 124 is achieved through hinge rod 125 and hinge rod 126, making the arc plate 124 tightly fit with the inner cylinder 2. Motor 11 starts, driving the rotating plate 111 to rotate. The rotation of the rotating plate 111 drives the rotating cylinder 12 to rotate. The rotation of the rotating cylinder 12 drives the arc plate 124 to rotate. The rotation of the arc plate 124 drives... The inner cylinder 2 rotates, facilitating its processing. When the arc plate 124 is replaced, the fixing nut 1239 is rotated, and the sliding push rod 1238 is slid to separate the push rod 1238 from the tilting rod. Then, the arc plate 124 is pushed, and the movement of the arc plate 124 causes the locking rod 1232 to move. Under the action of the guide ring 1234, the tilting rod retracts and separates from the locking rod 1232, realizing the disassembly of the arc plate 124. This facilitates the replacement of the arc plate 124, adapts to different sizes of the inner cylinder 2, and improves the flexibility of the device.

[0043] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A mold expansion device for a rolling machine, comprising a base (1), characterized in that: The upper end of the base (1) is provided with a rotating cylinder (12), and a number of positioning blocks (123) are provided on the outer side of the rotating cylinder (12). The positioning blocks (123) are arranged circumferentially along the rotating cylinder (12). The end of the positioning block (123) away from the rotating cylinder (12) is provided with a corresponding arc plate (124). The arc plate (124) is in contact with the inner wall of the inner cylinder (2). The positioning block (123) is provided with a positioning groove (1231). Both ends of the positioning block (123) are provided with inclined rods. The inclined rods are telescopic. The side of the arc plate (124) near the positioning block (123) is fixed with a corresponding locking rod (123). 1232), the clamping rod (1232) is inserted into the positioning groove (1231). The end of the clamping rod (1232) away from the arc plate (124) is fixed with a guide surface (1233). The guide surface (1233) guides the inclined rod. The outer side of the clamping rod (1232) is provided with a guide ring (1234). The guide ring (1234) is slidably connected to the clamping rod (1232) along the length direction of the clamping rod (1232). The upper end of the rotating drum (12) is provided with a telescopic component. The telescopic component is used to drive the positioning block (123) to move. The lower end of the rotating drum (12) is provided with a rotating component. The rotating component is used to drive the rotating drum (12) to rotate.

2. The expansion device of a rolling mill according to claim 1, characterized in that: The telescopic assembly includes a cylinder (127), a connecting cylinder (121), a lifting rod (128), and several hinge rods (125). The cylinder (127) is located at the upper end of the rotating cylinder (12). The lifting rod (128) is coaxially fixed with the output end of the cylinder (127). The connecting cylinder (121) is located inside the rotating cylinder (12), and the connecting cylinder (121) is fixedly connected to the lifting rod (128). Several hinge rods (125) are evenly distributed around the connecting cylinder (121), and the hinge rods (125) are connected to the cylinder (128). The connecting cylinder (121) is hinged, and a positioning plate (122) is provided at the end of the first hinge rod (125) away from the connecting cylinder (121). The positioning plate (122) is hinged to the first hinge rod (125). The positioning block (123) is fixed at the end of the positioning plate (122) away from the first hinge rod (125). Several second hinge rods (126) are provided on the outside of the rotating cylinder (12). The second hinge rods (126) are hinged to the rotating cylinder (12), and the end of the second hinge rods (126) away from the rotating cylinder (12) is hinged to the positioning plate (122).

3. The expansion device of a rolling mill according to claim 2, characterized in that: A plurality of sliders (1211) are fixed on the outside of the connecting cylinder (121), and a sliding groove corresponding to each slider (1211) is opened in the rotating cylinder (12). The sliders (1211) are located in the sliding groove and are slidably connected to the rotating cylinder (12) in the vertical direction.

4. The expansion device of a rolling mill according to claim 1, characterized in that: The rotating component includes a motor (11) and a rotating plate (111). The motor (11) is fixed at the upper end of the base (1). The rotating plate (111) is coaxially fixed with the output shaft of the motor (11). The end of the rotating plate (111) away from the motor (11) is bolted to the rotating drum (12).

5. The expansion device of a rolling mill according to claim 1, characterized in that: The tilting rod includes a connecting rod (1235), a tilting block (1236), and an elastic element (1237). The connecting rod (1235) is fixed inside the positioning block (123). The tilting block (1236) is located at one end of the connecting rod (1235) near the locking rod (1232). The tilting block (1236) is slidably connected to the connecting rod (1235) along the length direction of the connecting rod (1235). The tilting block (1236) tilts from top to bottom towards the connecting rod (1235). The elastic element (1237) is located between the connecting rod (1235) and the tilting block (1236). The elastic element (1237) is used to drive the tilting block (1236) to slide along the length direction of the connecting rod (1235).

6. The expansion device of a rolling mill according to claim 5, characterized in that: The positioning block (123) is provided with a push rod (1238) corresponding to the inclined block (1236). The push rod (1238) is slidably connected to the positioning block (123) along the width direction of the positioning block (123), and the push rod (1238) abuts against the inclined block (1236). A fixing nut (1239) is provided at the end of the push rod (1238) away from the inclined block (1236), and the fixing nut (1239) is threadedly connected to the push rod (1238).

7. The expansion device of a rolling mill according to claim 1, characterized in that: A fixing plate (1241) is fixedly provided at the upper end of the arc plate (124). A baffle (1243) is provided at the end of the fixing plate (1241) away from the fixing plate (1241). The baffle (1243) is slidably connected to the fixing plate (1241) in the vertical direction. The baffle (1243) is provided with a guide surface, which is used to guide the inner cylinder (2) to fit against the arc plate (124). An elastic element (1242) is fixedly provided between the fixing plate (1241) and the baffle (1243).

8. The expansion device of a rolling mill according to claim 1, characterized in that: The lower end of the base (1) is fixed with a support plate (13), and both ends of the support plate (13) are fixed with cylinders (132). The output end of cylinders (132) is coaxially fixed with the base (1). Limiting blocks (131) are slidably connected to both ends of the support plate (13). The limiting blocks (131) are used to limit the inner cylinder (2). The limiting blocks (131) are provided with arc-shaped surfaces (133), and the arc-shaped surfaces (133) are in contact with the outer wall of the inner cylinder (2).

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