Connection Structure and Method between an Expandable Bladder and a Tension Roller for a Variable Tension Roller System

Abstract

The present invention belongs to the technical field of strip rolling, and particularly relates to a connection structure and method between an expandable bladder and a tension roll for a variable tension roll system. A connection structure between an expandable bladder and a tension roll for a variable tension roll system includes a tension roll mandrel, an expandable bladder wrapped outside the tension roll mandrel. The expandable bladder is segmented and sealed axially along the tension roll mandrel. Each segment of the expandable bladder is respectively provided with an inlet and an outlet for a liquid or gas pressure medium. Quick-change joints are respectively arranged at the inlet and the outlet. The expandable bladder is hermetically connected to the tension roll mandrel through the quick-change joints. The quick-change joint adopted by the present invention includes an expandable bladder connection section and a tension roll mandrel connection section. Through the insertion and extraction of the two sections, the relative rotation during the connection process between the expandable bladder body and the tension roll mandrel is avoided, the processability of their connection is improved, the relative deformation of the hot melt connection between one end of the quick-change joint and the expandable bladder body during the connection process is reduced, and the reliability of the joint seal is improved.

Description

Technical Field

[0001] The invention belongs to the technical field of strip rolling, and particularly relates to a connection structure and method between an expandable bladder and a tension roll for a variable tension roll system. Background Art

[0002] Tension is one of the most direct and effective control means for shape control. Giving full play to the regulating ability of tension on shape is an important direction for deeply exploring the rolling shape control efficiency. Different types of rolling mills have different control abilities and effects on the transverse flatness of the strip. Most of them control the strip shape by adjusting the bending force of different rolls, the transverse shifting of intermediate rolls, tilting rolls, segmented cooling, high-tension rolling, etc. However, the effects of bending force and roll shifting on shape control are mainly reflected at the edges. Tilting rolls mainly control the shape wedge. Segmented cooling mainly controls high-order waviness and belongs to a near-steady-state regulation process with poor real-time performance. High tension is beneficial to reducing the rolling force but has poor fine control ability for local strip shape. Therefore, the scope of action of each shape control means in the strip width direction is limited. Moreover, under the limitations of rolling and subsequent heat treatment control processes, with a certain shape control target, for strips with high requirements for cross-sectional profile regulation such as silicon steel and DI materials, the strip cross-sectional profile control develops from traditional center cross-sectional convexity control to edge thinning control. The coupling phenomenon of flatness and cross-sectional profile regulation is very likely to occur during the production process. Especially when conventional cold rolling develops towards extremely thin rolling, the demand for new shape control means becomes more and more urgent.

[0003] The tension roll system for axial variable tension rolling controls the pressure in each expandable bladder through a control valve group to apply different supporting forces along the axis of the tension roll, thereby constructing different tensile stresses in the strip width direction. It can be used as a coiling guide roll, a tension roll group, a tension measuring roll, and an inter-stand loop roll. While meeting the process requirements, it constructs different supporting reaction forces for the strip to achieve variable tension rolling in the strip width direction during the rolling process, improves the control ability and flexibility of tension on shape, provides a more powerful shape control means for high-precision strip rolling, and is beneficial to improving the quality of strip materials. The tension roll system for axial variable tension rolling includes two core parts: a tension roll mandrel and an expandable bladder. Since the expandable bladder is coated on the outer surface of the tension roll mandrel and there are an oil inlet and an oil return port, how to achieve reliable connection and disassembly between the tension roll mandrel and the expandable bladder is one of the key technologies in the manufacture of the tension roll system. Summary of the Invention

[0004] Aiming at the above problems, the purpose of the invention is to provide a connection structure and method between an expandable bladder and a tension roll for a variable tension roll system, which realizes the connection between the expandable bladder and the tension roll mandrel by inserting and pulling out both ends of a quick-release joint, with simple and fast installation and good sealing performance.

[0005] The technical solution of the present invention lies in: a connection structure between an expandable bladder and a tension roller for a variable tension roller system, including a tension roller mandrel, and an expandable bladder wrapped around the outside of the tension roller mandrel. The expandable bladder is segmented and sealed axially along the tension roller mandrel. Each segment of the expandable bladder is respectively provided with an inlet and an outlet for a liquid or gas pressure medium. Quick-change joints are respectively provided at the inlet and the outlet. The expandable bladder is hermetically connected to the tension roller mandrel through the quick-change joints.

[0006] The quick-change joint includes an expandable bladder connection section and a tension roller mandrel connection section. The expandable bladder connection section includes an expandable bladder connection section body. The upper part of the expandable bladder connection section body is provided with a quick-change joint vulcanization connection end. The quick-change joint vulcanization connection end is bonded to the body of the expandable bladder through vulcanization and heat melting. The outside of the expandable bladder connection section body is provided with a quick-change joint sliding sleeve. A quick-change joint sliding sleeve spring is arranged inside the quick-change joint sliding sleeve. The outside of the quick-change joint sliding sleeve is provided with an annular flange. A plurality of round holes are evenly distributed on the surface of the annular flange. The inside of the expandable bladder connection section body is hollow and is divided into a first hollow section and a second hollow section. An upper quick-change joint sealing valve is arranged in the first hollow section. An upper quick-change joint valve core and an upper spring are installed inside the upper quick-change joint sealing valve. A plurality of catch holes are circumferentially arranged on the inner side wall of the second hollow section. Quick-change joint connection catch beads are arranged in the catch holes.

[0007] An annular flange is arranged on the outer side of the upper end of the quick-change joint vulcanization connection end, and an annular groove is arranged in the middle of the annular flange.

[0008] The diameter of the second hollow section is larger than that of the first hollow section. A sealing gasket is arranged at the top of the second hollow section. A quick-change joint sliding sleeve snap ring is circumferentially arranged on the outer side wall of the second hollow section.

[0009] The tension roller mandrel connection section includes a tension roller mandrel connection section body. A quick-change joint sealing valve sealing ring is arranged at the top of the tension roller mandrel connection section body. The inside of the tension roller mandrel connection section body is hollow and is provided with a lower quick-change joint sealing valve. A lower quick-change joint valve core and a lower spring are installed inside the lower quick-change joint sealing valve. A quick-change joint threaded fixing end is arranged on the upper outer side of the tension roller mandrel connection section body. An annular protrusion is arranged on the upper outer side of the quick-change joint threaded fixing end. The annular protrusion is clamped with the quick-change joint connection catch bead. The lower part of the quick-change joint threaded fixing end is hermetically connected to the tension roller mandrel through a sealing thread.

[0010] A snap ring is arranged at the lower inner side of the tension roller mandrel connection section body, and the lower quick-change joint sealing valve is fixed inside the tension roller mandrel connection section body by the snap ring.

[0011] The sealing thread is a 55-degree sealed pipe thread, and a sealing gasket or thread sealing grease is arranged at the sealing thread connection.

[0012] The inflatable bladder includes, from outside to inside, a bladder surface rubber layer, an intermediate layer, and a reinforcing cord fabric layer. The intermediate layer is composed of nylon threads and steel wires. The steel wires and nylon filaments are cross-laid inside the bladder surface rubber layer, and the laying cross angle ranges from 0° to 90°.

[0013] A connection method for an inflatable bladder and a tension roller of a variable tension roller system, using any one of the above-mentioned connection structures for the inflatable bladder and the tension roller of the variable tension roller system, includes the following steps:

[0014] S1: Vulcanize and bond the quick-change joint vulcanized connection end of the inflatable bladder connection section body to the body of the inflatable bladder respectively, and connect the quick-change joint threaded fixed end of the tension roller mandrel connection section body to the tension roller mandrel through a sealed thread.

[0015] S2: Insert the quick-change joint threaded fixed end of the tension roller mandrel connection section body into the second hollow section of the inflatable bladder connection section body. Control the radial expansion and contraction of the quick-change joint connection beads through the axial movement of the quick-change joint sliding sleeve, so that the quick-change joint connection beads clamp the annular protrusion at the upper end of the quick-change joint threaded fixed end to complete the connection of the quick-change joint.

[0016] S3: Auxiliary connect the inner surface of the inflatable bladder and the outer surface of the tension roller mandrel by gluing to complete the connection between the inflatable bladder and the tension roller.

[0017] In the step S2, an inflatable bladder connection section installer is used to connect the quick-change joint sliding sleeve, and then connect the inflatable bladder connection section and the tension roller mandrel connection section. The inflatable bladder connection section installer includes a "Y"-shaped installation arm and sliding sleeve claws vertically connected to both sides of the "Y"-shaped end of the installation arm. The specific process is as follows: Put the sliding sleeve claws into the round holes on the quick-change joint sliding sleeve, and control the axial movement of the quick-change joint sliding sleeve by lifting the installation arm.

[0018] The technical effects of the present invention are as follows: 1. The quick-change joint adopted by the present invention includes an inflatable bladder connection section and a tension roller mandrel connection section. Through the insertion and extraction of the two sections, the relative rotation during the connection process between the inflatable bladder body and the tension roller mandrel is avoided, and the connection processability of the two is improved; 2. The present invention realizes the connection by the insertion and extraction of the quick-change joint, reduces the relative deformation of the hot-melt connection between one end of the quick-change joint and the inflatable bladder body during the connection process, and improves the reliability of the joint seal; 3. The inflatable bladder body and the tension roller mandrel of the present invention are auxiliary-connected by gluing, which improves the connection strength between the inflatable bladder body and the tension roller mandrel; 4. The present invention adopts a flexible inflatable bladder, and a rubber layer is used on the outside to avoid scratching the surface of the strip by the rigid roller, and nylon threads and steel wires are arranged inside to improve the load-bearing capacity of the bladder body.

[0019] The following will be further described with reference to the accompanying drawings. Description of the Drawings

[0020] Figure 1 FIG. is a three-dimensional schematic diagram of an expandable bladder and a tension roller for a variable tension roller system according to an embodiment of the present invention.

[0021] Figure 2 FIG. is a structural cross-sectional view of an expandable bladder and a tension roller for a variable tension roller system according to an embodiment of the present invention.

[0022] Figure 3 FIG. is a partially enlarged schematic diagram of the connection structure between an expandable bladder and a tension roller for a variable tension roller system according to an embodiment of the present invention.

[0023] Figure 4 FIG. is a schematic diagram of a quick-change joint structure between an expandable bladder and a tension roller for a variable tension roller system according to an embodiment of the present invention.

[0024] Figure 5 FIG. is a schematic diagram of the layered structure of the bladder body of an expandable bladder for a variable tension roller system and a tension roller according to an embodiment of the present invention.

[0025] Figure 6 FIG. is a schematic diagram of the installation of the connection section of the expandable bladder of an expandable bladder and a tension roller for a variable tension roller system according to an embodiment of the present invention.

[0026] Figure 7 FIG. is a top view of the installation of the connection section of the expandable bladder of an expandable bladder and a tension roller for a variable tension roller system according to an embodiment of the present invention.

[0027] Figure 8 FIG. is a sectional view taken along line A-A of the installation of the connection section of the expandable bladder of an expandable bladder and a tension roller for a variable tension roller system according to an embodiment of the present invention.

[0028] [[ID=3...]]Reference Numerals: 1 - Expandable Bladder, 2 - Tension Roller Core Shaft, 3 - Quick-Change Joint, 101 - Rubber Layer on the Bladder Surface, 102 - Intermediate Layer, 103 - Reinforcing Cord Fabric Layer, 301 - Vulcanized Connection End of the Quick-Change Joint, 302 - Upper Quick-Change Joint Spool and Upper Spring, 303 - Upper Quick-Change Joint Sealing Valve, 304 - Quick-Change Joint Sleeve, 305 - Quick-Change Joint Sleeve Spring, 306 - Quick-Change Joint Connection Ball, 307 - Quick-Change Joint Sleeve Snap Ring, 308 - Threaded Fixed End of the Quick-Change Joint, 309 - Sealing Ring of the Quick-Change Joint Sealing Valve, 310 - Sealing Gasket, 311 - Circlip, 312 - Body of the Expandable Bladder Connection Section, 313 - Body of the Tension Roller Core Shaft Connection Section, 314 - Lower Quick-Change Joint Sealing Valve, 315 - Lower Quick-Change Joint Spool and Lower Spring, 316 - Annular Flange, 317 - Round Hole, 4 - Installer for the Expandable Bladder Connection Section, 401 - Sleeve Claw, 402 - Installation Arm. Detailed Description of the Embodiment

[0029] Example 1

[0030] As Figure 1 、 Figure 2 shown, a connection structure between an expandable bladder and a tension roller for a variable tension roller system includes a tension roller mandrel 2 and an expandable bladder 1 wrapped around the outside of the tension roller mandrel 2. The expandable bladder 1 is segmented and sealed axially along the tension roller mandrel 2. Each segment of the expandable bladder 1 is respectively provided with an inlet and an outlet for a liquid or gas pressure medium. Quick-change joints 3 are respectively provided at the inlet and the outlet. The expandable bladder 1 is hermetically connected to the tension roller mandrel 2 through the quick-change joints 3.

[0031] During actual use, in the present invention, the expandable bladder 1 is hermetically connected to the tension roller mandrel 2 through the quick-change joints 3, which is simple and fast to install and has good sealing performance.

[0032] Example 2

[0033] Preferably, on the basis of Example 1, in this embodiment, as Figure 3 、 Figure 4 shown, the quick-change joint 3 includes an expandable bladder connection section and a tension roller mandrel connection section. The expandable bladder connection section includes an expandable bladder connection section body 312. A quick-change joint vulcanization connection end 301 is provided at the upper part of the expandable bladder connection section body 312. The quick-change joint vulcanization connection end 301 is bonded to the body of the expandable bladder 1 through vulcanization and hot melting. A quick-change joint sliding sleeve 304 is provided outside the expandable bladder connection section body 312. A quick-change joint sliding sleeve spring 305 is provided inside the quick-change joint sliding sleeve 304. An annular flange 316 is provided outside the quick-change joint sliding sleeve 304. A plurality of round holes 317 are evenly distributed on the surface of the annular flange 316. The inside of the expandable bladder connection section body 312 is hollow and is divided into a first hollow section and a second hollow section. An upper quick-change joint sealing valve 303 is provided in the first hollow section. An upper quick-change joint valve core and an upper spring 302 are installed in the upper quick-change joint sealing valve 303. A plurality of bead holes are circumferentially provided on the inner side wall of the second hollow section. Quick-change joint connection beads 306 are provided in the bead holes.

[0034] During actual use, a quick-change joint vulcanization connection end 301 is provided at the upper part of the expandable bladder connection section body 312 of the present invention. The quick-change joint vulcanization connection end 301 is vulcanized and heat-bonded to the body of the expandable bladder 1. The quick-change joint connection bead 306 is assembled in a plurality of bead holes circumferentially provided on the inner side wall of the second hollow section. An annular flange 316 is provided on the outer side of the quick-change joint sliding sleeve 304. A plurality of circular holes 317 are evenly distributed on the surface of the annular flange 316. By controlling the plurality of circular holes 317 evenly distributed on the surface of the annular flange 316, the axial movement of the quick-change joint sliding sleeve 304 is controlled, so as to control the radial expansion and contraction of the quick-change joint connection bead 306, and realize the connection between the expandable bladder connection section and the tension roller mandrel connection section.

[0035] Embodiment 3

[0036] Preferably, on the basis of Embodiment 2, in this embodiment, an annular flange is provided on the outer side of the upper end of the quick-change joint vulcanization connection end 301, and an annular groove is provided in the middle of the annular flange.

[0037] During actual use, the present invention enables the connection end of the expandable bladder 1 to easily penetrate into the annular groove. When bonding is achieved by vulcanization and heat melting, the vulcanization bonding area and stiffness can be increased, and the connection reliability can be improved.

[0038] Embodiment 4

[0039] Preferably, on the basis of Embodiment 2 or Embodiment 3, in this embodiment, the diameter of the second hollow section is larger than the diameter of the first hollow section. A sealing gasket 310 is provided at the top of the second hollow section, and a quick-change joint sliding sleeve snap ring 307 is circumferentially provided on the outer side wall of the second hollow section.

[0040] During actual use, the quick-change joint sliding sleeve 304 of the present invention is sleeved outside the expandable bladder connection section body 312, and radial restraint and limit are realized through the quick-change joint sliding sleeve spring 305 and the quick-change joint sliding sleeve snap ring 307. The quick-change joint sliding sleeve snap ring 307 prevents the quick-change joint sliding sleeve 304 from axially falling off the expandable bladder connection section body 312.

[0041] Embodiment 5

[0042] Preferably, on the basis of Embodiment 2, in this embodiment, the tension roller mandrel connection section includes a tension roller mandrel connection section body 313. A quick-change joint seal valve sealing ring 309 is provided at the top of the tension roller mandrel connection section body 313. The interior of the tension roller mandrel connection section body 313 is hollow and is provided with a lower quick-change joint seal valve 314. A lower quick-change joint valve core and a lower spring 315 are installed inside the lower quick-change joint seal valve 314. An upper outer part of the tension roller mandrel connection section body 313 is provided with a quick-change joint threaded fixing end 308. An annular protrusion is provided on the upper outer side of the quick-change joint threaded fixing end 308. The annular protrusion is clamped with a quick-change joint connection catch 306. The lower part of the quick-change joint threaded fixing end 308 is connected to the tension roller mandrel 2 through a sealed thread.

[0043] During actual use, in the present invention, an upper outer part of the tension roller mandrel connection section body 313 is provided with a quick-change joint threaded fixing end 308. An annular protrusion is provided on the upper outer side of the quick-change joint threaded fixing end 308. The annular protrusion is clamped with a quick-change joint connection catch 306. The lower part of the quick-change joint threaded fixing end 308 is connected to the tension roller mandrel 2 through a sealed thread.

[0044] Embodiment 6

[0045] Preferably, on the basis of Embodiment 5, in this embodiment, a circlip 311 is provided at the lower inner side of the tension roller mandrel connection section body 313. The circlip 311 fixes the lower quick-change joint seal valve 314 inside the tension roller mandrel connection section body 313.

[0046] During actual use, in the present invention, the circlip 311 fixes the lower quick-change joint seal valve 314 inside the tension roller mandrel connection section body 313, facilitating the installation and disassembly of the lower quick-change joint seal valve 314.

[0047] Embodiment 7

[0048] Preferably, on the basis of Embodiment 5 or Embodiment 6, in this embodiment, the sealed thread is a 55-degree sealed pipe thread, and a sealing washer or thread sealing grease is provided at the sealed thread connection.

[0049] During actual use, in the present invention, the sealed thread is a 55-degree sealed pipe thread, and a sealing washer or thread sealing grease is provided at the sealed thread connection to ensure the connection sealing effect.

[0050] Embodiment 8

[0051] Preferably, on the basis of Embodiment 1, in this embodiment, as Figure 5As shown, the inflatable bladder 1 includes a bladder surface rubber layer 101, an intermediate layer 102, and a reinforcing cord fabric layer 103 from outside to inside. The intermediate layer 102 is composed of nylon threads and steel wires. The steel wires and nylon filaments are cross-laid inside the bladder surface rubber layer 101, and the laying cross angle ranges from 0° to 90°.

[0052] During actual use, the flexible inflatable bladder 1 is adopted in the present invention. The bladder surface rubber layer 101 is used on the outside to prevent the rigid roller from scratching the surface of the strip, and the nylon threads and steel wires are arranged in the internal intermediate layer 102 to improve the bearing capacity of the bladder.

[0053] Example 9

[0054] A connection method for an inflatable bladder and a tension roller of a variable tension roller system, using the connection structure of any of the above-mentioned inflatable bladders for a variable tension roller system and a tension roller, includes the following steps:

[0055] S1: Sulfurize and thermally bond the quick-change joint vulcanization connection end 301 of the inflatable bladder connection section body 312 with the body of the inflatable bladder 1 respectively, and connect the quick-change joint threaded fixing end 308 of the tension roller mandrel connection section body 313 with the tension roller mandrel 2 through a sealed thread.

[0056] S2: Insert the quick-change joint threaded fixing end 308 of the tension roller mandrel connection section body 313 into the second hollow section of the inflatable bladder connection section body 312. Control the radial expansion and contraction of the quick-change joint connection bead 306 through the axial movement of the quick-change joint sliding sleeve 304, so that the quick-change joint connection bead 306 clamps the annular protrusion at the upper end of the quick-change joint threaded fixing end 308 to complete the connection of the quick-change joint 3.

[0057] In the step S2, an inflatable bladder connection section installer 4 is used to connect the quick-change joint sliding sleeve 304, and then connect the inflatable bladder connection section and the tension roller mandrel connection section. As Figures 6 to 8 shown, the inflatable bladder connection section installer 4 includes a "Y"-shaped installation arm 402 and sliding sleeve claws 401 vertically connected to both sides of the "Y"-shaped end of the installation arm 402. The specific process is: put the sliding sleeve claws 401 into the round holes 317 on the quick-change joint sliding sleeve 304, and control the axial movement of the quick-change joint sliding sleeve 304 by lifting the installation arm 402.

[0058] The above is only a preferred specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions that can be easily thought of by those skilled in the art within the technical scope disclosed by the present invention should be covered within the protection scope of the present invention.

Claims

1. A connecting structure between an expandable bladder and a tension roller for a variable tension roller system, characterized in that: It includes a tension roll mandrel (2) and an expandable bladder (1) wrapped around the outside of the tension roll mandrel (2). The expandable bladder (1) is arranged in a segmented and sealed manner along the axial direction of the tension roll mandrel (2). Each segment of the expandable bladder (1) is respectively provided with an inlet and an outlet for a liquid or gas pressure medium. Quick-change joints (3) are respectively arranged at the inlet and the outlet. The expandable bladder (1) is hermetically connected to the tension roll mandrel (2) through the quick-change joints (3).

2. The connecting structure between the expandable bladder and the tension roller for a variable tension roller system according to claim 1, characterized in that: The quick-change joint (3) includes an expandable bladder connection section and a tension roll mandrel connection section. The expandable bladder connection section includes an expandable bladder connection section body (312). An upper quick-change joint vulcanization connection end (301) is arranged on the upper part of the expandable bladder connection section body (312). The upper quick-change joint vulcanization connection end (301) is bonded to the body of the expandable bladder (1) through vulcanization and hot melting. A quick-change joint sliding sleeve (304) is arranged on the outside of the expandable bladder connection section body (312). A quick-change joint sliding sleeve spring (305) is arranged inside the quick-change joint sliding sleeve (304). An annular flange (316) is arranged on the outside of the quick-change joint sliding sleeve (304). A plurality of round holes (317) are evenly distributed on the surface of the annular flange (316). The inside of the expandable bladder connection section body (312) is hollow and is divided into a first hollow section and a second hollow section. An upper quick-change joint sealing valve (303) is arranged in the first hollow section. An upper quick-change joint valve core and an upper spring (302) are installed in the upper quick-change joint sealing valve (303). A plurality of bead holes are circumferentially arranged on the inner side wall of the second hollow section. A quick-change joint connection bead (306) is arranged in the bead holes.

3. The connection structure between the expandable bladder and the tension roller for a variable tension roller system according to claim 2, characterized in that: An annular flange is arranged on the outer side of the upper end of the upper quick-change joint vulcanization connection end (301), and an annular groove is arranged in the middle of the annular flange.

4. The connection structure between the expandable bladder and the tension roller for a variable tension roller system according to claim 3, characterized in that: The diameter of the second hollow section is larger than that of the first hollow section. A sealing gasket (310) is arranged at the top of the second hollow section. A quick-change joint sliding sleeve snap ring (307) is circumferentially arranged on the outer side wall of the second hollow section.

5. The connection structure between the expandable bladder and the tension roller for a variable tension roller system according to claim 4, characterized in that: The tension roll mandrel connection section includes a tension roll mandrel connection section body (313). A quick-change joint sealing valve sealing ring (309) is arranged at the top of the tension roll mandrel connection section body (313). The inside of the tension roll mandrel connection section body (313) is hollow. A lower quick-change joint sealing valve (314) is arranged inside the tension roll mandrel connection section body (313). A lower quick-change joint valve core and a lower spring (315) are installed in the lower quick-change joint sealing valve (314). A quick-change joint threaded fixing end (308) is arranged on the upper outer side of the tension roll mandrel connection section body (313). An annular protrusion is arranged on the upper outer side of the quick-change joint threaded fixing end (308). The annular protrusion is clamped with the quick-change joint connection bead (306). The lower part of the quick-change joint threaded fixing end (308) is hermetically threadedly connected to the tension roll mandrel (2).

6. The connection structure between the expandable bladder and the tension roller for a variable tension roller system according to claim 5, characterized in that: A circlip (311) is provided at the lower part inside the connecting section body (313) of the tension roller mandrel, and the circlip (311) fixes the lower quick-change joint sealing valve (314) inside the connecting section body (313) of the tension roller mandrel.

7. The connection structure between the expandable bladder and the tension roller for a variable tension roller system according to claim 6, characterized in that: The sealing thread is a 55-degree sealed pipe thread, and a sealing washer or thread sealing grease is provided at the sealing thread connection.

8. The connection structure between the expandable bladder and the tension roller for a variable tension roller system according to claim 7, characterized in that: The expandable bladder (1) includes, from outside to inside, a bladder surface rubber layer (101), an intermediate layer (102), and a reinforcing cord fabric layer (103). The intermediate layer (102) is composed of nylon threads and steel wires, and the steel wires and nylon filaments are cross-laid inside the bladder surface rubber layer (101), and the laying cross angle range is 0° to 90°.

9. A connection method between an expandable bladder and a tension roller for a variable tension roller system, using any one of the connection structures between the expandable bladder and the tension roller for a variable tension roller system as described in claim 8, characterized in that: It includes the following steps: S1: The vulcanized connection end (301) of the quick-change joint of the expandable bladder connection section body (312) and the body of the expandable bladder (1) are vulcanized and hot-bonded respectively, and the threaded fixed end (308) of the quick-change joint of the tension roller mandrel connection section body (313) and the tension roller mandrel (2) are connected through a sealing thread. S2: The threaded fixed end (308) of the quick-change joint of the tension roller mandrel connection section body (313) is inserted into the second hollow section of the expandable bladder connection section body (312). The axial movement of the quick-change joint sliding sleeve (304) is controlled to radially expand and contract the quick-change joint connecting ball (306), so that the quick-change joint connecting ball (306) clamps the annular protrusion at the upper end of the threaded fixed end (308) of the quick-change joint, and the connection of the quick-change joint (3) is completed. S3: The inner surface of the expandable bladder (1) and the outer surface of the tension roller mandrel (2) are assistedly connected by gluing to complete the connection between the expandable bladder and the tension roller.

10. A connection method between an expandable bladder and a tension roller for a variable tension roller system according to claim 9, characterized in that: In the step S2, a expandable bladder connection section installer (4) is used to connect the quick-change joint sliding sleeve (304), and then the expandable bladder connection section and the tension roller mandrel connection section are connected. The expandable bladder connection section installer (4) includes a "Y"-shaped mounting arm (402) and sliding sleeve claws (401) vertically connected to both sides of the "Y"-shaped end of the mounting arm (402). The specific process is as follows: The sliding sleeve claws (401) are sleeved into the round holes (317) on the quick-change joint sliding sleeve (304), and by lifting the mounting arm (402), the axial movement of the quick-change joint sliding sleeve (304) is controlled.

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