Rotary pneumatic tensioning device between rollers

Abstract

The utility model relates to the technical field of rollers, in particular to a rotary pneumatic tensioning device between rollers, which comprises a tensioning power mechanism and a tensioning pipe group. The tensioning pipe set comprises an inner tensioning pipe and an outer tensioning pipe, the inner tensioning pipe can move in a reciprocating mode in an inner cavity of the outer tensioning pipe, and the outer diameter of a second port of the inner tensioning pipe is the same as the inner diameter of a first port of the outer tensioning pipe. The tensioning power mechanism comprises an inner pipe tensioning supporting frame, an outer pipe tensioning supporting frame, an inner pipe tensioning air cylinder and an outer pipe tensioning air cylinder, the tensioning inner pipe is located on the inner side of the inner pipe tensioning supporting frame, and the tensioning outer pipe is located on the inner side of the outer pipe tensioning supporting frame. The inner pipe tensioning air cylinder drives the inner pipe tensioning supporting frame to drive the inner tensioning pipe, and the outer pipe tensioning air cylinder drives the outer pipe tensioning supporting frame to drive the outer tensioning pipe to do reciprocating motion. A plurality of groups of rollers are convenient to combine and operate, the rollers are flexibly combined according to different processing materials, the automation degree is improved, and the roller connecting device is suitable for roller connection under various working conditions.

Description

Technical Field

[0001] The utility model relates to the technical field of rollers, in particular to a rotary pneumatic tensioning device between rollers. Background Art

[0002] The raw materials used in processing Chinese herbal medicines and pills contain moisture. The raw materials are quickly dried using high-temperature hot air through a drum to reduce the moisture content of the raw materials and achieve the purpose of air-drying. The traditional drum structure is a group of drums, which is bulky, not conducive to transportation and installation and commissioning. The air-drying quality is unstable, and the moisture content of the materials after air-drying varies greatly, affecting production quality and efficiency. The prior art in this field considers the use of multiple groups of drum connection combinations. The drums are grouped and designed for combined connection. The drum temperature can be controlled in groups, which improves production quality and efficiency, and the quality is stable and reliable. At the same time, it reduces the occupied space, facilitates combined movement, and facilitates group cleaning and maintenance. However, a connecting mechanism is required to connect the drums. Utility Model Content

[0003] The utility model aims to solve at least one of the technical problems existing in the related art. To this end, the utility model provides a rotary pneumatic tensioning device between rollers.

[0004] The utility model provides a rotary pneumatic tensioning device between rollers, comprising a tensioning power mechanism and a tensioning tube group;

[0005] The expansion tube group comprises an expansion inner tube and an expansion outer tube, wherein the expansion inner tube can reciprocate in the inner cavity of the expansion outer tube, and the outer diameter of the second port of the expansion inner tube is the same as the inner diameter of the first port of the expansion outer tube, the first port of the expansion inner tube is used to connect to the first roller, and the second port of the expansion outer tube is used to connect to the second roller;

[0006] The tensioning power mechanism includes an inner tube tensioning support frame, an outer tube tensioning support frame, an inner tube tensioning cylinder and an outer tube tensioning cylinder. The tensioning inner tube is connected through the inner side of the inner tube tensioning support frame, and the tensioning outer tube is connected through the inner side of the outer tube tensioning support frame. The inner tube tensioning cylinder drives the tensioning inner tube to move back and forth by driving the inner tube tensioning support frame, and the outer tube tensioning cylinder drives the tensioning outer tube to move back and forth by driving the outer tube tensioning support frame.

[0007] Furthermore, according to a rotary pneumatic tensioning device between rollers provided by the utility model, it also includes an inner tube tensioning retaining ring and an outer tube tensioning retaining ring, the inner side of the inner tube tensioning retaining ring is fixedly connected to the tensioning inner tube, the inner side of the outer tube tensioning retaining ring is fixedly connected to the tensioning outer tube, the outer side of the inner tube tensioning retaining ring and the inner side of the inner tube tensioning support frame, and the outer side of the outer tube tensioning retaining ring and the inner side of the outer tube tensioning support frame are respectively connected through annular sliding components.

[0008] Furthermore, according to a rotary pneumatic tensioning device between rollers provided by the utility model, the annular sliding assembly includes a ball and an annular groove, the ball is arranged in the annular groove, and the outer side of the inner tube tensioning ring and the outer side of the outer tube tensioning ring are respectively provided with the annular groove and a plurality of the balls.

[0009] Furthermore, according to a rotary pneumatic tensioning device between rollers provided by the utility model, it also includes a mounting plate, the tensioning power mechanism and the tensioning tube group are mounted on the mounting plate, an opening is provided in the center of the mounting plate, and the size of the opening is adapted to the second port of the tensioning outer tube.

[0010] Furthermore, according to the utility model, a rotary pneumatic tensioning device between rollers further includes an inner tube tensioning guide assembly and an outer tube tensioning guide assembly, and the inner tube tensioning guide assembly and the outer tube tensioning guide assembly are arranged on the mounting plate.

[0011] Furthermore, according to a rotary pneumatic tensioning device between rollers provided by the utility model, the outer tube tensioning support frame is provided with two relative outer tube tensioning cylinders, and the outer tube tensioning support frame is provided with two groups of relative outer tube tensioning guide assemblies; the inner tube tensioning support frame is provided with two relative inner tube tensioning cylinders, and the inner tube tensioning support frame is provided with two groups of relative inner tube tensioning guide assemblies; the inner tube tensioning cylinders, the inner tube tensioning guide assemblies, the outer tube tensioning cylinders, and the outer tube tensioning guide assemblies are evenly spaced on the mounting plate.

[0012] Furthermore, according to a rotary pneumatic tensioning device between rollers provided by the utility model, the inner tube tensioning guide assembly and the outer tube tensioning guide assembly respectively include a guide rod, a linear bearing and a connecting plate, one end of the guide rod is fixedly connected to the mounting plate, the linear bearing is movably sleeved on the guide rod, the linear bearing is connected to the connecting plate, the connecting plate of the inner tube tensioning guide assembly is connected to the inner tube tensioning support frame, and the connecting plate of the outer tube tensioning guide assembly is connected to the outer tube tensioning support frame.

[0013] Furthermore, according to the rotary pneumatic tensioning device between rollers provided by the utility model, it also includes a tube sealing ring, which is arranged at the first port of the tensioning outer tube and is used for sealing and adapting with the second port of the tensioning inner tube.

[0014] Furthermore, according to a rotary pneumatic tensioning device between rollers provided by the utility model, the inner tensioning tube and the outer tensioning tube are both in a truncated cone shape.

[0015] Furthermore, according to a rotary pneumatic tensioning device between rollers provided by the utility model, the second surface of the mounting plate is provided with a scissor-type opening and closing mechanism, and the opening and closing mechanism is used to close or open the opening of the mounting plate; the first surface of the mounting plate is provided with a driver to control the opening and closing action of the opening and closing mechanism; the inner tube tensioning guide assembly, the outer tube tensioning guide assembly, the inner tube tensioning cylinder and the outer tube tensioning cylinder are arranged on the first surface of the mounting plate.

[0016] The above one or more technical solutions in the embodiments of the utility model have at least one of the following technical effects:

[0017] The utility model provides a rotary pneumatic tensioning device between rollers, which can make it easy to operate when multiple groups of rollers are combined, and the rollers can be flexibly combined according to different processing materials. At the same time, it is convenient to maintain and clean the rollers, and the temperature of the rollers can be controlled in groups, thereby improving production efficiency and quality and reducing costs. The design of the inner tube tensioning guide component and the outer tube tensioning guide component ensures that the inner tube tensioning support frame and the outer tube tensioning support frame can run smoothly and have high stability and reliability. Since the outer side of the inner tube tensioning retaining ring and the inner side of the inner tube tensioning support frame, as well as the outer side of the outer tube tensioning retaining ring and the inner side of the outer tube tensioning support frame, are respectively connected by annular sliding components, the rotary pneumatic tensioning device between the rollers provided by the utility model can rotate synchronously with the rollers, thereby improving the degree of automation of material entry and exit, and has a wide range of applications, and can be suitable for roller connection in various working conditions such as multi-drum dryers.

[0018] Additional aspects and advantages of the present invention will be given in part in the following description, and in part will become apparent from the following description, or will be learned through the practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the technical solutions in the present invention or the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0020] Figure 1 The utility model is a schematic diagram of the overall structure of a rotary pneumatic tensioning device between rollers.

[0021] Figure 2 It is a structural schematic diagram of the scissor-type opening and closing mechanism provided by the utility model.

[0022] Figure 3 It is a schematic diagram of the structure of the tensioned outer tube provided by the utility model.

[0023] Figure 4 It is a schematic diagram of the tensioning inner tube structure provided by the utility model.

[0024] Figure 5 It is a schematic diagram of the tightened state of the tightened outer tube and the tightened inner tube provided by the utility model.

[0025] Figure 6 It is a schematic diagram of the tension outer tube and the tension inner tube provided by the utility model in the pulled apart state.

[0026] Reference numerals:

[0027] 1. Tension inner tube; 2. Tension support frame for inner tube; 3. Tension cylinder for inner tube; 4. Tension cylinder for outer tube; 5. Mounting plate; 6. Guide rod; 7. Linear bearing; 8. Connecting plate; 9. Driver; 10. Opening; 11. Opening and closing mechanism; 12. Tension outer tube; 14. Sealing ring; 15. Sealing ring stand; 16. Tension support frame for outer tube; 17. Tension retaining ring for inner tube. DETAILED DESCRIPTION

[0028] In order to make the purpose, technical solution and advantages of the utility model clearer, the technical solution of the utility model will be clearly and completely described below in conjunction with the drawings in the utility model. Obviously, the described embodiments are part of the embodiments of the utility model, rather than all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model. The following embodiments are used to illustrate the utility model, but cannot be used to limit the scope of the utility model.

[0029] In the description of the embodiments of the present utility model, it should be noted that the terms "center", "longitudinal", "lateral", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the embodiments of the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the embodiments of the present utility model. In addition, the terms "first", "second", and "third" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance.

[0030] In the description of the embodiments of the present utility model, it should be noted that, unless otherwise clearly specified and limited, the terms "connected" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in the embodiments of the present utility model can be understood according to specific circumstances.

[0031] In the embodiments of the present invention, unless otherwise clearly specified and limited, the first feature being "above" or "below" the second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, the first feature being "above", "above" and "above" the second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. The first feature being "below", "below" and "below" the second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0032] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the utility model embodiment. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0033] Combine the following Figure 1-Figure 6 Description of the utility model of a rotary pneumatic tensioning device between rollers:

[0034] According to the utility model, a rotary pneumatic tensioning device between rollers includes a tensioning power mechanism and a tensioning tube group;

[0035] The expansion tube group includes an expansion inner tube 1 and an expansion outer tube 12, wherein the expansion inner tube 1 reciprocates in the inner cavity of the expansion outer tube 12, and the outer diameter of the second port of the expansion inner tube 1 is the same as the inner diameter of the first port of the expansion outer tube 12, the first port of the expansion inner tube 1 is used to connect to the first roller, and the second port of the expansion outer tube 12 is used to connect to the second roller;

[0036] In an embodiment, the tensioning inner tube 1 can be telescopically sleeved in the tensioning outer tube 12, and the tensioning inner tube 1 is coaxially arranged with the tensioning outer tube 12. The tensioning inner tube 1 can reciprocate in the inner cavity of the tensioning outer tube 12 along the axial direction. When the second port of the tensioning inner tube 1 moves to the first port of the tensioning outer tube 12, the two ports are tightly connected, and the second port of the tensioning inner tube 1 is clamped in the first port of the tensioning outer tube 12. The tensioning inner tube 1 moves toward the inner cavity of the tensioning outer tube 12 under the driving action of the tensioning power mechanism.

[0037] The tensioning power mechanism includes an inner tube tensioning support frame 2, an outer tube tensioning support frame 16, an inner tube tensioning cylinder 3 and an outer tube tensioning cylinder 4. The tensioning inner tube 1 is connected to the inner side of the inner tube tensioning support frame 2, and the tensioning outer tube 12 is connected to the inner side of the outer tube tensioning support frame 16. The inner tube tensioning cylinder 3 drives the tensioning inner tube 1 to move back and forth by driving the inner tube tensioning support frame 2, and the outer tube tensioning cylinder 4 drives the tensioning outer tube 12 to move back and forth by driving the outer tube tensioning support frame 16.

[0038] According to the utility model, a rotary pneumatic tensioning device between rollers is provided, which also includes an inner tube tensioning retaining ring 17 and an outer tube tensioning retaining ring. The inner side of the inner tube tensioning retaining ring 17 is fixedly connected to the tensioning inner tube 1, the inner side of the outer tube tensioning retaining ring is fixedly connected to the tensioning outer tube 12, the outer side of the inner tube tensioning retaining ring 17 is connected to the inner side of the inner tube tensioning support frame 2, and the outer side of the outer tube tensioning retaining ring is connected to the inner side of the outer tube tensioning support frame 16, respectively, through annular sliding components.

[0039] In the embodiment, preferably, the tensioning inner tube 1 is fixedly connected to the inner side of the inner tube tensioning retaining ring 17, and the tensioning outer tube 12 is fixedly connected to the inner side of the outer tube tensioning retaining ring. The connection method can be welding, and it can be adjusted according to the material, working conditions, etc.; the inner tube tensioning cylinder 3 and the outer tube tensioning cylinder 4 can both be set as linear cylinders.

[0040] In the embodiment, the outer tube tensioning retainer and the inner tube tensioning retainer can both rotate circumferentially in the inner tube tensioning support frame 2 and the outer tube tensioning support frame 16 respectively through an annular sliding assembly, and the circumferential rotation is the circumferential track direction of the annular sliding assembly.

[0041] In the embodiment, the inner tube tensioning retaining ring 17 can rotate circumferentially along the inner tube tensioning support frame 2, and the outer tube tensioning retaining ring can rotate circumferentially along the outer tube tensioning support frame 16, so that the first roller drives the tensioned inner tube 1 and the second roller drives the tensioned outer tube 12 to rotate.

[0042] In the embodiment, the inner tube tensioning support frame 2, the outer tube tensioning support frame 16, the outer tube tensioning retaining ring, the inner tube tensioning retaining ring 17, the tensioning inner tube 1 and the tensioning outer tube 12 are coaxially arranged.

[0043] According to a rotary pneumatic tensioning device between rollers provided by the utility model, the annular sliding assembly includes balls and annular grooves, the balls are arranged in the annular grooves, and the outer sides of the inner tube tensioning retaining ring 17 and the outer sides of the outer tube tensioning retaining ring are respectively provided with annular grooves and a plurality of the balls.

[0044] In the embodiment, a full circle of balls is installed at the connection between the inner tube tensioning support frame 2 and the inner tube tensioning retaining ring 17, so that the inner tube tensioning retaining ring 17 can rotate in the inner tube tensioning support frame 2; the outer side of the inner tube tensioning retaining ring 17 is connected to the inner side of the inner tube tensioning support frame 2. Preferably, the inner tube tensioning support frame 2 can be provided with a groove, and the edge of the inner tube tensioning retaining ring 17 is arranged in the groove, which can not only realize the rotation of the inner tube tensioning retaining ring 17 in the inner tube tensioning support frame 2, but also enable the inner tube tensioning support frame 2 to drive the inner tube tensioning retaining ring 17 to reciprocate in a straight line; the outer tube tensioning retaining ring and the outer tube tensioning support frame 16 are arranged in the same way to achieve the same function.

[0045] According to the utility model, a rotary pneumatic tensioning device between rollers is provided, which also includes a mounting plate 5, the tensioning power mechanism and the tensioning tube group are mounted on the mounting plate 5, and an opening 10 is provided in the center of the mounting plate, and the size of the opening is adapted to the second port of the tensioning outer tube 12.

[0046] In the embodiment, the expansion outer tube 12 passes through the opening 10 and is connected to the roller to be connected.

[0047] According to the utility model, a rotary pneumatic tensioning device between rollers further comprises an inner tube tensioning guide assembly and an outer tube tensioning guide assembly, wherein the inner tube tensioning guide assembly and the outer tube tensioning guide assembly are arranged on the mounting plate 5 .

[0048] In the embodiment, the inner tube tensioning guide assembly is used to guide and limit the movement direction of the tensioned inner tube 1, and the outer tube tensioning guide assembly is used to guide and limit the movement direction of the tensioned outer tube 12, thereby improving the operation stability of the tensioned inner tube 1 and the tensioned outer tube 12.

[0049] According to a rotary pneumatic tensioning device between rollers provided by the utility model, the outer tube tensioning support frame 16 is provided with two opposite outer tube tensioning cylinders, and the outer tube tensioning support frame 16 is provided with two groups of opposite outer tube tensioning guide assemblies; the inner tube tensioning support frame 2 is provided with two opposite inner tube tensioning cylinders 3, and the inner tube tensioning support frame 2 is provided with two groups of opposite inner tube tensioning guide assemblies; the inner tube tensioning cylinder 3, the inner tube tensioning guide assembly, the outer tube tensioning cylinder 4 and the outer tube tensioning guide assembly are evenly spaced and arranged on the mounting plate 5.

[0050] In an embodiment, multiple groups of the inner tube tensioning guide assembly, the outer tube tensioning guide assembly, the inner tube tensioning cylinder 3 and the outer tube tensioning cylinder 4 can be provided, and adjustments can be made according to the working conditions. The inner tube tensioning guide assembly, the outer tube tensioning guide assembly, the inner tube tensioning cylinder 3 and the outer tube tensioning cylinder 4 need to be arranged at intervals so as not to interfere with each other during operation; preferably, they are arranged at even intervals, which can also improve the stability of operation.

[0051] According to a rotary pneumatic tensioning device between rollers provided by the utility model, the inner tube tensioning guide assembly and the outer tube tensioning guide assembly respectively include a guide rod 6, a linear bearing 7 and a connecting plate 8, one end of the guide rod 6 is fixedly connected to the mounting plate 5, the linear bearing 7 is movably passed through the guide rod 6, the linear bearing 7 is connected to the connecting plate 8, the connecting plate of the inner tube tensioning guide assembly is connected to the inner tube tensioning support frame 2, and the connecting plate of the outer tube tensioning guide assembly is connected to the outer tube tensioning support frame 16.

[0052] According to the utility model, a rotary pneumatic tensioning device between rollers further comprises a tube sealing ring, which is arranged at the first port of the tensioning outer tube 12 and is used for sealing and adapting with the second port of the tensioning inner tube 1 .

[0053] In the embodiment, a tube sealing ring is provided at the connection between the tensioning inner tube 1 and the tensioning outer tube 12, and a sealing ring 14 can be provided at the first port of the tensioning inner tube 1 and the second port of the tensioning outer tube, and the sealing ring 14 is used to improve the tightness of the connection between the tensioning device and the roller. The tensioning inner tube 1, the tensioning outer tube 12, the mounting plate 5, the inner tube tensioning support frame 2, the inner tube tensioning retaining ring 17, the tensioning outer tube 12 and the outer tube tensioning support frame 16, the outer tube tensioning retaining ring, the guide rod 6, etc. can all be made of stainless steel, and the tube sealing ring and the sealing ring 14 can be made of silicone.

[0054] According to the rotary pneumatic tensioning device between rollers provided by the utility model, the tensioning inner tube 1 and the tensioning outer tube 12 are both in the shape of a truncated cone.

[0055] In the embodiment, preferably, the inner cavity of the tension inner tube 1 and the inner cavity of the tension outer tube 12 are both configured to have a small first port and a large second port. A sealing ring platform 15 is provided along the port circumference outside the first port of the tension inner tube 1. The sealing ring platform 15 is provided with a groove for placing the sealing ring 14. The sealing ring platform 15 can be configured as a hollow structure, which is convenient for processing and reduces the mass of the tension inner tube 1. The second port of the tension outer tube 12 can also be provided with a sealing ring groove, which can be adjusted according to the working conditions.

[0056] According to a rotary pneumatic tensioning device between rollers provided by the utility model, a scissor-type opening and closing mechanism 11 is provided on the second surface of the mounting plate, and the opening and closing mechanism 11 is used to close or open the opening 10 of the mounting plate 5; a driver 9 is provided on the first surface of the mounting plate 5 to control the action of the opening and closing mechanism 11; the inner tube tensioning guide assembly, the outer tube tensioning guide assembly, the inner tube tensioning cylinder and the outer tube tensioning cylinder are arranged on the first surface of the mounting plate.

[0057] In an embodiment, the opening and closing mechanism driver can be set as a linear cylinder, and the driver 9 is evenly spaced from the inner tube tensioning cylinder, the outer tube tensioning cylinder, the inner tube tensioning guide assembly and the outer tube tensioning guide assembly so as not to interfere with each other during operation.

[0058] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the utility model, rather than to limit it. Although the utility model has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the various embodiments of the utility model.

Claims

1. A rotary pneumatic tensioning device between rollers, characterized in that: It includes a tensioning power mechanism and a tensioning tube group; The expansion tube group comprises an expansion inner tube and an expansion outer tube, wherein the expansion inner tube can reciprocate in the inner cavity of the expansion outer tube, and the outer diameter of the second port of the expansion inner tube is the same as the inner diameter of the first port of the expansion outer tube, the first port of the expansion inner tube is used to connect to the first roller, and the second port of the expansion outer tube is used to connect to the second roller; The tensioning power mechanism includes an inner tube tensioning support frame, an outer tube tensioning support frame, an inner tube tensioning cylinder and an outer tube tensioning cylinder. The tensioning inner tube is connected through the inner side of the inner tube tensioning support frame, and the tensioning outer tube is connected through the inner side of the outer tube tensioning support frame. The inner tube tensioning cylinder drives the tensioning inner tube to move back and forth by driving the inner tube tensioning support frame, and the outer tube tensioning cylinder drives the tensioning outer tube to move back and forth by driving the outer tube tensioning support frame.

2. A rotary pneumatic tensioning device between rollers according to claim 1, characterized in that: It also includes an inner tube tensioning retaining ring and an outer tube tensioning retaining ring, the inner side of the inner tube tensioning retaining ring is fixedly connected to the tensioning inner tube, the inner side of the outer tube tensioning retaining ring is fixedly connected to the tensioning outer tube, the outer side of the inner tube tensioning retaining ring is connected to the inner side of the inner tube tensioning support frame, and the outer side of the outer tube tensioning retaining ring is connected to the inner side of the outer tube tensioning support frame, respectively, through annular sliding components.

3. A rotary pneumatic tensioning device between rollers according to claim 2, characterized in that: The annular sliding assembly comprises a ball and an annular groove, the ball is arranged in the annular groove, and the outer side of the inner tube tightening retaining ring and the outer side of the outer tube tightening retaining ring are respectively provided with the annular groove and a plurality of the balls.

4. A rotary pneumatic tensioning device between rollers according to claim 1, characterized in that: It also includes a mounting plate, the tensioning power mechanism and the tensioning tube group are mounted on the mounting plate, an opening is provided at the center of the mounting plate, and the size of the opening is adapted to the second port of the tensioning outer tube.

5. A rotary pneumatic tensioning device between rollers according to claim 4, characterized in that: It also includes an inner tube tensioning guide assembly and an outer tube tensioning guide assembly, and the inner tube tensioning guide assembly and the outer tube tensioning guide assembly are arranged on the mounting plate.

6. A rotary pneumatic tensioning device between rollers according to claim 5, characterized in that: The outer tube tensioning support frame is provided with two opposite outer tube tensioning cylinders, and the outer tube tensioning support frame is provided with two groups of opposite outer tube tensioning guide assemblies; the inner tube tensioning support frame is provided with two opposite inner tube tensioning cylinders, and the inner tube tensioning support frame is provided with two groups of opposite inner tube tensioning guide assemblies; the inner tube tensioning cylinders, the inner tube tensioning guide assemblies, the outer tube tensioning cylinders and the outer tube tensioning guide assemblies are evenly spaced on the mounting plate.

7. A rotary pneumatic tensioning device between rollers according to claim 6, characterized in that: The inner tube tensioning guide assembly and the outer tube tensioning guide assembly respectively include a guide rod, a linear bearing and a connecting plate, one end of the guide rod is fixedly connected to the mounting plate, the linear bearing is movably sleeved on the guide rod, the linear bearing is connected to the connecting plate, the connecting plate of the inner tube tensioning guide assembly is connected to the inner tube tensioning support frame, and the connecting plate of the outer tube tensioning guide assembly is connected to the outer tube tensioning support frame.

8. A rotary pneumatic tensioning device between rollers according to claim 1, characterized in that: It also includes a tube sealing ring, which is arranged at the first port of the tensioned outer tube and is used for sealing and fitting with the second port of the tensioned inner tube.

9. A rotary pneumatic tensioning device between rollers according to any one of claims 1 to 8, characterized in that: The inner expansion tube and the outer expansion tube are both in a truncated cone shape.

10. A rotary pneumatic tensioning device between rollers according to claim 5, characterized in that: The second surface of the mounting plate is provided with a scissor-type opening and closing mechanism, which is used to close or open the opening of the mounting plate; the first surface of the mounting plate is provided with a driver to control the opening and closing action of the opening and closing mechanism; the inner tube tensioning guide assembly, the outer tube tensioning guide assembly, the inner tube tensioning cylinder and the outer tube tensioning cylinder are arranged on the first surface of the mounting plate.

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