Special tool for replacing second intermediate roll and back-up roll of 20-roll mill

Abstract

The invention belongs to the technical field of automatic roll changing of 20-roll mills, and relates to a special tool for roll changing of a second intermediate roll and a supporting roll of a 20-roll mill, which comprises a tool connecting shaft and an automatic rotary clamping device, the tool connecting shaft is used for connecting the second intermediate roll and the supporting roll and is detachably and fixedly connected with the automatic rotary clamping device, and the automatic rotary clamping device is fixedly connected with the tool connecting shaft. The tail end of the tool connecting shaft is inserted into the blind hole through the conical hole of the locking sleeve, a 45-degree guide clamping groove is formed in the tail end of the tool connecting shaft, and the length of the ejector rod is larger than the depth of the second stepped hole so that the ejector rod can be inserted into the 45-degree guide clamping groove. And when the pull rod slides to the small-aperture position of the first stepped hole from the position where the second stepped hole is located, the ejector rod locks the 45-degree guide clamping groove under the action of the locking sleeve. According to the automatic roll changing device, the tool connecting shaft is matched with the automatic rotary clamping device to achieve automatic roll changing of the second middle roll and the supporting roll, the production efficiency is improved, and the labor intensity is reduced.

Description

Technical Field

[0001] The invention belongs to the technical field of automatic roll changing of a 20-roller rolling mill, and relates to a special tool for changing the second intermediate roll and the support roll of a 20-roller rolling mill. Background Art

[0002] The 20-roll mill is the core equipment of the ultra-thin plate production line, which is used to repeatedly roll plates of ordinary thickness to achieve the production of ultra-thin plates. The 20-roll mill is mainly composed of a frame, a roll system, a roll box, a press device, a drive device, etc. Among them, the roll system is a very important component, which is divided into two groups, upper and lower. Each group consists of 4 support rolls, 3 second intermediate rolls, 2 first intermediate rolls and 1 working roll. The frame is a rectangular integral frame arch cast with high-quality steel, and the roll box is an upper and lower split roll box that slides with the arch window. The roll system of the 20-roll mill is very complex, with a large number of rolls, and there are also great differences in the structural dimensions of different types of rolls in the roll system, and the replacement frequency is very high.

[0003] At present, the second intermediate roll and support roll in the 20-roll mill are replaced by manually operated balance beams. There are many rolls, low replacement efficiency, and high labor intensity. Usually more than 5 operators are required to complete the operation. In addition, due to the use of balance beams, the parallelism of the rolls is difficult to control during the roll replacement process, and roll jams often occur. At present, many companies are exploring the use of roll changing robots to achieve automatic roll replacement, among which how to achieve automatic roll replacement of the second intermediate roll and support roll is one of the keys.

[0004] Therefore, it is very necessary to explore a safe and reliable special tool for changing the second intermediate roll and the support roll in a 20-roll mill to meet the needs of automatic roll changing of the second intermediate roll and the support roll, improve production efficiency and reduce labor intensity. Summary of the invention

[0005] In view of this, the object of the present invention is to provide a special tool for changing the second intermediate roll and the support roll of a 20-roll rolling mill, so as to realize automatic roll changing of the second intermediate roll and the support roll.

[0006] In order to achieve the above object, the present invention provides the following technical solutions:

[0007] A special tool for changing the second intermediate roll and the support roll of a 20-roller rolling mill, comprising a tooling connecting shaft and an automatic rotary clamping device, wherein the tooling connecting shaft is used to connect the second intermediate roll and the support roll, and is detachably fixedly connected to the automatic rotary clamping device;

[0008] The automatic rotary clamping device comprises a locking sleeve, a support, a push rod, a pull rod, a sleeve, an elastic member, a second gear and a top head, the locking sleeve is rotatably mounted in the support, a first stepped hole arranged along the axial direction is provided in the locking sleeve, and the large-diameter end of the first stepped hole is located at the front end of the locking sleeve, and a second gear is fixedly sleeved at the end of the locking sleeve to drive it to rotate; the pull rod is slidably mounted in the first stepped hole, and a blind hole for accommodating the end of the tooling shaft is provided at the front end of the pull rod, and a plurality of second stepped holes arranged radially and connected to the blind holes are provided around the front end of the pull rod, and the push rod is slidably placed in the second stepped hole; the sleeve is fixedly mounted in the locking sleeve and slidably sleeved on the pull rod, the elastic member is arranged on the sleeve, one end of which is connected to the sleeve, and the other end is connected to the pull rod, and provides a force for the pull rod toward the end, and the top head is arranged at the end of the pull rod, and is used to provide a thrust to the front end of the pull rod when the pull rod needs it;

[0009] A conical surface is also provided on the part of the tooling connecting shaft close to the 45-degree guide slot, and a conical hole matching the conical surface is provided in the locking sleeve, so that the tooling connecting shaft and the locking sleeve are in contact connection;

[0010] The end of the tooling shaft is inserted into the blind hole through the tapered hole of the locking sleeve, and a 45-degree guide slot is provided at the end of the tooling shaft. The length of the push rod is greater than the depth of the second step hole, so that the push rod can be inserted into the 45-degree guide slot and slide from the position of the second step hole on the pull rod to the small aperture of the first step hole. The push rod locks the 45-degree guide slot under the action of the locking sleeve.

[0011] Furthermore, a first 45-degree guide surface and a second 45-degree guide surface are respectively provided on both sides of the protrusion at one end of the 45-degree guide slot close to the ejector head, so as to push the ejector rod to move outward when the end of the tooling shaft is pulled out and inserted into the blind hole, thereby allowing the ejector rod to be inserted into the 45-degree guide slot.

[0012] Furthermore, a third 45-degree guide surface is provided at the step of the first stepped hole to facilitate the sliding of the ejector rod at the step.

[0013] Furthermore, both ends of the push rod are designed with spherical surfaces to respectively cooperate with the first 45-degree guide surface and the second 45-degree guide surface in the 45-degree guide slot and the third 45-degree guide surface in the first stepped hole.

[0014] Furthermore, the automatic rotating clamping device also includes a first gear meshing with the second gear, and the first gear is connected to a servo motor to drive the second gear to rotate.

[0015] Furthermore, the automatic rotary clamping device also includes an electro-hydraulic direct-drive cylinder for driving the plug to move toward the pull rod, so as to provide a thrust toward the front end of the pull rod when the pull rod needs it.

[0016] Furthermore, the elastic member is a disc spring assembly, and the locking sleeve is rotatably installed in the support via a bearing.

[0017] Furthermore, the tooling coupling includes a support roller tooling coupling and a second intermediate roller tooling coupling, which are respectively used to connect the support roller and the second intermediate roller, and the end structures of the support roller tooling coupling and the second intermediate roller tooling coupling are the same, both having a 45-degree guide slot for connecting an automatic rotating clamping device.

[0018] Furthermore, the support roller tooling coupling includes a first coupling, the front end of the first coupling is provided with a thread for connecting the support roller shaft end, the middle part is provided with a threaded pin mounting hole and a waist-shaped hole for positioning the support roller and the bearing seat, the end is provided with a 45-degree guide slot, and the part of the first coupling close to the 45-degree guide slot is provided with a conical surface matching the conical hole in the locking sleeve.

[0019] Furthermore, the second intermediate roller tooling connecting shaft includes a second connecting shaft, the front end of the second connecting shaft is provided with a third stepped hole, the third stepped hole is provided with evenly distributed fixing screw mounting holes, which are used to cooperate with the fixing screws to fix the second intermediate roller, the end is provided with a 45-degree guide slot, and the part of the first connecting shaft close to the 45-degree guide slot is provided with a tapered surface matching the tapered hole in the locking sleeve.

[0020] The beneficial effects of the present invention are:

[0021] The present invention provides a special tool for changing the second intermediate roll and support roll of a 20-roll rolling mill. The second intermediate roll and the support roll are fixedly connected by arranging a second intermediate roll tooling shaft and a support roll tooling shaft, and an automatic rotating clamping device which is detachably fixedly connected to the tooling shaft is provided, thereby realizing automatic roll changing of the second intermediate roll and the support roll.

[0022] The present invention sets the end structures of the second intermediate roller tooling coupling shaft and the supporting roller tooling coupling shaft to be consistent, which not only meets the needs of fixing and positioning the rollers, but also meets the needs of using an automatic rotating clamping device to clamp the two rollers, greatly reducing spare parts and improving roller changing efficiency.

[0023] The present invention realizes the positioning and clamping and locking of the roller by adopting a locking sleeve with a tapered hole and a pull rod structure with a push rod; by adopting a disc spring group and an electro-hydraulic direct-drive cylinder to respectively provide locking and releasing power for the pull rod, and by adopting a servo motor to drive the gear transmission, the rotational positioning of the second intermediate roller and the support roller is realized, and finally the automatic roller changing needs of the second intermediate roller and the support roller are met, thereby improving production efficiency and reducing labor intensity.

[0024] Other advantages, objectives and features of the present invention will be described in the following description to some extent, and to some extent, will be obvious to those skilled in the art based on the following examination and study, or can be taught from the practice of the present invention. The objectives and other advantages of the present invention can be realized and obtained through the following description. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to make the purpose, technical solutions and advantages of the present invention more clear, the present invention will be described in detail below in conjunction with the accompanying drawings, wherein:

[0026] Figure 1 It is a structural schematic diagram of a special tool for changing the second intermediate roll and the backup roll of a 20-roller rolling mill in the present invention;

[0027] Figure 2 It is a schematic diagram of the structure of the automatic rotary clamping device in the present invention;

[0028] Figure 3 It is a structural schematic diagram of the support roller fixture connecting shaft in the present invention;

[0029] Figure 4 It is a structural schematic diagram of the second intermediate roller fixture connecting shaft in the present invention;

[0030] Figure 5 This is a diagram of the automatic clamping state of the second intermediate roll and the support roll of the 20-roller rolling mill in the present invention.

[0031] Reference numerals: support roller fixture shaft 1, second intermediate roller fixture shaft 2, automatic rotary clamping device 3, 45-degree guide slot 4, first 45-degree guide surface 401, second 45-degree guide surface 402;

[0032] Support roller fixture connecting shaft 1: first connecting shaft 101, threaded pin 102, waist-shaped hole 103;

[0033] Second intermediate roller fixture connecting shaft 2: set screw 201, second connecting shaft 202;

[0034] Automatic rotary clamping device 3: locking sleeve 301, support 302, push rod 303, pull rod 304, sleeve 305, disc spring group 306, first gear 307, second gear 308, servo motor 309, push head 3010, electro-hydraulic direct drive cylinder 3011, locking nut 3012, bearing 3013, tapered hole 3014, third 45-degree guide surface 3015, first step hole 3016, second step hole 3017. DETAILED DESCRIPTION

[0035] The following describes the embodiments of the present invention by specific examples, and those skilled in the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification. The present invention can also be implemented or applied through other different specific embodiments, and the details in this specification can also be modified or changed in various ways based on different viewpoints and applications without departing from the spirit of the present invention. It should be noted that the illustrations provided in the following embodiments only illustrate the basic concept of the present invention in a schematic manner, and the following embodiments and features in the embodiments can be combined with each other without conflict.

[0036] Among them, the drawings are only used for illustrative explanations, and they only represent schematic diagrams rather than actual pictures, and should not be understood as limitations on the present invention. In order to better illustrate the embodiments of the present invention, some parts of the drawings may be omitted, enlarged or reduced, and do not represent the size of actual products. For those skilled in the art, it is understandable that some well-known structures and their descriptions in the drawings may be omitted.

[0037] The same or similar numbers in the drawings of the embodiments of the present invention correspond to the same or similar parts; in the description of the present invention, it should be understood that if the terms "upper", "lower", "left", "right", "front", "rear", etc. indicate the orientation or position relationship, they are based on the orientation or position relationship shown in the drawings, which is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation. Therefore, the terms describing the position relationship in the drawings are only used for illustrative purposes and cannot be understood as limiting the present invention. For ordinary technicians in this field, the specific meanings of the above terms can be understood according to specific circumstances.

[0038] See also Figure 1 to Figure 5 , is a special tool for replacing the second intermediate roll and support roll of a 20-roll rolling mill, comprising a support roll tooling shaft 1, a second intermediate roll tooling shaft 2 and an automatic rotary clamping device 3, wherein the support roll tooling shaft 1 and the second intermediate roll tooling shaft 2 can be detachably fixedly connected to the automatic rotary clamping device 3, and the structure of the connection between the support roll tooling shaft 1 and the second intermediate roll tooling shaft 2 and the automatic rotary clamping device 3 is the same, so that the automatic rotary clamping device 3 can clamp the support roll and the second intermediate roll respectively, so as to realize the automatic clamping and replacement of the second intermediate roll and the support roll of the 20-roll rolling mill.

[0039] The automatic rotary clamping device 3 is used to automatically clamp the support roller fixture shaft 1 or the second intermediate roller fixture shaft 2, and automatically rotate the corresponding roller to a set angle through the support roller fixture shaft 1 or the second intermediate roller fixture shaft 2, and includes a locking sleeve 301, a support 302, a push rod 303, a pull rod 304, a sleeve 305, a disc spring group 306, a first gear 307, a second gear 308, a servo motor 309, a push head 3010 and an electro-hydraulic direct drive cylinder 3011;

[0040] The support is used to support the automatic rotating clamping device. The locking sleeve 301 is installed in the support 302 through a bearing 3013. A tapered hole 3014 is provided at the front end for cooperating with the tooling shaft to achieve precise positioning of the roller connected to the tooling shaft. A first stepped hole 3016 arranged along the axial direction is provided in the middle of the locking sleeve 301 to achieve scaling of the push rod 303 along its radial direction, thereby achieving locking and loosening of the tooling shaft. A second gear 308 is provided at the fixed sleeve at its end to drive the locking sleeve 301 to rotate.

[0041] The push rod 303 adopts a stepped shaft design and is slidably mounted in a second stepped hole 3017 arranged radially in the pull rod 304. The length of the push rod 303 is greater than the depth of the second stepped hole. The end of the push rod 303 away from the pull rod 304 is a large diameter end, thereby meeting the requirements of movement and limitation of the push rod 303 at the same time.

[0042] The pull rod 304 is axially slidably installed in the locking sleeve 301, and a blind hole is provided at the front end for accommodating the 45-degree guide slot 4 in the tooling shaft to provide an operating space for the end of the tooling shaft; and four second stepped holes arranged radially and connected to the blind holes are provided around the front end of the pull rod 304 for installing the push rod 303; the end of the pull rod 304 is provided with a thread for installing the locking nut 3012;

[0043] The sleeve 305 is installed in the locking sleeve 301 and connected to the locking sleeve 301 at its end by bolts to fix the sleeve on the locking sleeve; the sleeve 305 is slidably sleeved on the pull rod 304, and a disc spring group 306 is arranged in the sleeve 305. The front end of the disc spring group 306 is connected to the sleeve 305, and the end is connected to the locking nut 3012 on the pull rod. The sleeve 305 is used to provide guide positioning for the pull rod 304, and at the same time provide installation support and reverse force for the disc spring group 306. The pull rod 304 moves toward the end under the action of the pre-tightening force of the disc spring group 306.

[0044] The inner diameter of the inner hole of the first stepped hole in the locking sleeve 301 near the front end is larger than the inner diameter of the inner hole adjacent to it and near the end, so that when the pull rod 304 moves toward the end under the action of the pre-tightening force of the disc spring group 306, the top rod 303 installed in the second stepped hole shrinks toward the center of the pull rod 304.

[0045] The second gear 308 is installed on the locking sleeve 301 and is connected to the first gear 307 meshing therewith. The first gear 307 is connected to the servo motor 309, so that the servo motor 309 drives the first gear 307 to accurately adjust the angle of the support roller bearing seat or the second intermediate roller, thereby realizing the installation of the support roller or the second intermediate roller in the slots arranged at different angles.

[0046] The electro-hydraulic direct-drive cylinder 3011 is arranged at the end of the entire automatic rotary clamping device, and is used to provide a larger forward thrust for the ram 3010 in a smaller space, while avoiding the need to set up a hydraulic station and arrange hydraulic pipelines. The ram 3010 is in contact connection with the end of the pull rod 304, so that the force of the electro-hydraulic direct-drive cylinder 3011 pushes the pull rod 304 forward through the ram 3010 to overcome the pre-tightening force of the disc spring group 306, thereby allowing the ram 303 to enter the inner hole in the first step hole near the front end of the locking sleeve 301, thereby loosening the tooling coupling.

[0047] Preferably, both ends of the push rod 303 adopt a spherical design, and a third 45-degree guide surface 3015 matching the spherical design is provided at the step of the first stepped hole 3016 , so as to achieve scaling of the push rod 303 .

[0048] A 45-degree guide slot 4 cooperating with the ejector pin 303 is provided at one end of the tooling shaft, and a first 45-degree guide surface 401 and a second 45-degree guide surface 402 are respectively provided on both sides of the protrusion of one end of the 45-degree guide slot 4 close to the ejector head 3010 to cooperate with the spherical design of the ejector pin 303, thereby pushing the ejector pin 303 to move outward.

[0049] The tooling connection shaft comprises a support roller tooling connection shaft 1 connected to the support roller and a second intermediate roller tooling connection shaft 2 connected and positioned with the second intermediate roller;

[0050] The main components of the support roller tooling coupling include: a first coupling 101, a threaded pin 102 and a waist-shaped hole 103. The first coupling 101 is used to connect the support roller shaft end and the automatic rotating clamping device 3, and the threaded pin 102 and the waist-shaped hole 103 position and fix the support roller and the support roller bearing seat.

[0051] The front end of the first connecting shaft 101 is provided with a thread for connecting with the shaft end of the support roller; the middle part is provided with a threaded pin mounting hole and a waist-shaped hole 103, which are respectively used to position the support roller and the bearing seat to prevent the position of the bearing seat from changing when the support roller rotates; the end is provided with a 45-degree guide slot 4, the first 45-degree guide surface 401 and the second 45-degree guide surface 402 are used to push open the push rod when the first connecting shaft 101 enters and exits the locking sleeve, the 45-degree guide slot 4 is used for the push rod to lock the first connecting shaft 101, and a conical surface matching the conical hole 3014 in the locking sleeve 301 is provided on the part of the first connecting shaft close to the 45-degree guide slot 4.

[0052] The main components of the second intermediate roller fixture shaft include: a second shaft 202 and a set screw 201, which are used to connect the second intermediate roller shaft end and the automatic rotating clamping device 3, and position and lock the second intermediate roller shaft end in the circumferential direction through the set screw 201.

[0053] A third stepped hole is provided at the front end of the second connecting shaft 202 for mounting and cooperating with the shaft end of the second intermediate roller; the third stepped hole is provided with evenly distributed fixing screw mounting holes for cooperating with the fixing screw 201 to fix the second intermediate roller; the end structure of the second connecting shaft 202 is the same as that of the first connecting shaft, and is provided with a conical surface cooperating with the locking sleeve and a 45-degree guide groove, which are respectively used to push open the push rod and lock the connecting shaft when the second connecting shaft enters and exits the locking sleeve, so that the locking sleeve can simultaneously clamp the support roller and the second intermediate roller.

[0054] The working principle of the special tool for changing the second intermediate roll and the support roll of the 20-high rolling mill is as follows:

[0055] First, install the support roller fixture shaft 1 to the support roller shaft end, and position the support roller and the support roller bearing seat through the threaded pin 102 and the support roller bearing seat positioning pin in conjunction with the threaded pin mounting hole and the waist-shaped hole 103. Similarly, install the second intermediate roller fixture shaft 2 to the second intermediate roller shaft end, and lock and fix it through the set screw 201 in conjunction with the set screw mounting hole;

[0056] Then the electro-hydraulic direct-drive cylinder 3011 pushes the pull rod 304 forward through the push head 3010, so that the push rod 303 is in the larger stepped hole in the locking sleeve 301;

[0057] Then, the automatic rotary clamping device 3 is moved forward as a whole, so that the end of the tooling connecting shaft (support roller tooling connecting shaft 1 or the second intermediate roller tooling connecting shaft 2) enters the locking sleeve 301, and the automatic rotary clamping device 3 continues to move forward as a whole, so that the conical surface of the connecting shaft contacts the conical hole of the locking sleeve, and keeps pushing the head forward, while the second 45-degree guide surface 402 pushes the ejector rod to move outward, and then the ejector rod 303 falls into the 45-degree guide slot 4 at the end of the connecting shaft;

[0058] Then the electro-hydraulic direct-drive cylinder 3011 retracts, and the pull rod 304 and the push rod 303 move backward under the drive of the disc spring assembly 306. First, the push rod 303 returns to the smaller stepped hole in the locking sleeve, so that the push rod moves toward the center of the pull rod;

[0059] The pull rod 304 then continues to move backward, so that the push rod 303 presses against the first 45-degree guide surface 401 of the connecting shaft, thereby pulling the connecting shaft tightly against the locking sleeve, completing the clamping of the support roller or the second intermediate roller;

[0060] Then the servo motor 309 drives the gear set consisting of the first gear 307 and the second gear 308 to rotate, adjusts the support roller or the second intermediate roller to a predetermined angle, and then inserts the support roller or the second intermediate roller into the corresponding installation position;

[0061] Finally, remove the support roller fixture coupling and the second intermediate roller fixture coupling to complete the roller change.

[0062] The working principle of removing the second intermediate roll and the support roll from the rolling mill is the same as the working principle of the above-mentioned roll changing process. After adjusting the support roll or the second intermediate roll to a predetermined angle, the support roll or the second intermediate roll is removed from the rolling mill.

[0063] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solution of the present invention can be modified or replaced by equivalents without departing from the purpose and scope of the technical solution, which should be included in the scope of the claims of the present invention.

Claims

1. A special tool for changing the second intermediate roll and the backup roll of a 20-roll mill, characterized in that: It includes a tooling connecting shaft and an automatic rotary clamping device, wherein the tooling connecting shaft is used to connect the second intermediate roller and the supporting roller, and is detachably fixedly connected to the automatic rotary clamping device; The automatic rotary clamping device comprises a locking sleeve, a support, a push rod, a pull rod, a sleeve, an elastic member, a second gear and a top head, the locking sleeve is rotatably mounted in the support, a first stepped hole arranged along the axial direction is provided in the locking sleeve, and the large-diameter end of the first stepped hole is located at the front end of the locking sleeve, and a second gear is fixedly sleeved at the end of the locking sleeve to drive it to rotate; the pull rod is slidably mounted in the first stepped hole, and a blind hole for accommodating the end of the tooling shaft is provided at the front end of the pull rod, and a plurality of second stepped holes arranged radially and connected to the blind holes are provided around the front end of the pull rod, and the push rod is slidably placed in the second stepped hole; the sleeve is fixedly mounted in the locking sleeve and slidably sleeved on the pull rod, the elastic member is arranged on the sleeve, one end of which is connected to the sleeve, and the other end is connected to the pull rod, and provides a force for the pull rod toward the end, and the top head is arranged at the end of the pull rod, and is used to provide a thrust to the front end of the pull rod when the pull rod needs it; A conical surface is also provided on the part of the tooling connecting shaft close to the 45-degree guide slot, and a conical hole matching the conical surface is provided in the locking sleeve, so that the tooling connecting shaft and the locking sleeve are in contact connection; The end of the tooling shaft is inserted into the blind hole through the tapered hole of the locking sleeve, and a 45-degree guide slot is provided at the end of the tooling shaft. The length of the push rod is greater than the depth of the second step hole, so that the push rod can be inserted into the 45-degree guide slot and slide from the position of the second step hole on the pull rod to the small aperture of the first step hole. The push rod locks the 45-degree guide slot under the action of the locking sleeve.

2. The special tool for changing the second intermediate roll and the backup roll of a 20-high rolling mill according to claim 1, characterized in that: A first 45-degree guide surface and a second 45-degree guide surface are respectively provided on both sides of the protrusion at one end of the 45-degree guide slot close to the ejector head, so as to push the ejector rod to move outward when the end of the tooling shaft is pulled out and inserted into the blind hole, thereby allowing the ejector rod to be inserted into the 45-degree guide slot.

3. The special tool for changing the second intermediate roll and the backup roll of a 20-high rolling mill according to claim 2, characterized in that: A third 45-degree guide surface is provided at the step of the first stepped hole to enable the push rod to slide at the step.

4. The special tool for changing the second intermediate roll and the backup roll of a 20-high rolling mill according to claim 3, characterized in that: Both ends of the push rod are designed with spherical surfaces to respectively match with the first 45-degree guide surface and the second 45-degree guide surface in the 45-degree guide slot and the third 45-degree guide surface in the first stepped hole.

5. The special tool for changing the second intermediate roll and the backup roll of a 20-high rolling mill according to claim 1, characterized in that: The automatic rotating clamping device also includes a first gear meshing with the second gear, and the first gear is connected to a servo motor to drive the second gear to rotate.

6. The special tool for changing the second intermediate roll and the backup roll of a 20-high rolling mill according to claim 1, characterized in that: The automatic rotary clamping device also includes an electro-hydraulic direct-drive cylinder for driving the head to move toward the pull rod, so as to provide a thrust to the front end of the pull rod when the pull rod needs it.

7. The special tool for changing the second intermediate roll and the backup roll of a 20-high rolling mill according to claim 1, characterized in that: The elastic member is a disc spring group, and the locking sleeve is rotatably installed in the support through a bearing.

8. The special tool for changing the second intermediate roll and the backup roll of a 20-high rolling mill according to any one of claims 1 to 7, characterized in that: The tooling coupling shaft comprises a support roller tooling coupling shaft and a second intermediate roller tooling coupling shaft respectively used to connect the support roller and the second intermediate roller, and the end structures of the support roller tooling coupling shaft and the second intermediate roller tooling coupling shaft are the same, both having a 45-degree guide slot for connecting an automatic rotary clamping device.

9. The special tool for changing the second intermediate roll and the backup roll of a 20-high rolling mill according to claim 8, characterized in that: The support roller tooling coupling includes a first coupling, the front end of the first coupling is provided with a thread for connecting the support roller shaft end, the middle part is provided with a threaded pin mounting hole and a waist-shaped hole for positioning the support roller and the bearing seat, the end is provided with a 45-degree guide slot, and the part of the first coupling close to the 45-degree guide slot is provided with a conical surface matching the conical hole in the locking sleeve.

10. The special tool for changing the second intermediate roll and the backup roll of a 20-high rolling mill according to claim 8, characterized in that: The second intermediate roller tooling connecting shaft includes a second connecting shaft, a front end of the second connecting shaft is provided with a third stepped hole, the third stepped hole is provided with evenly distributed fixing screw mounting holes for fixing the second intermediate roller with the fixing screws, a 45-degree guide slot is provided at the end, and a conical surface matching the conical hole in the locking sleeve is provided at the part of the first connecting shaft close to the 45-degree guide slot.

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