Drawing type tension separating device

Abstract

The utility model provides a drawing type tension separating device which comprises a left end side plate, a right end side plate, an upper roller assembly, a lower roller assembly and a positioning track, the lower roller assembly is further provided with sliding mechanisms corresponding to the lower portions of the two ends of a lower roller body respectively, the sliding mechanisms are matched with the positioning track in a sliding mode, and the positioning end plate is detachably connected with the left end plate. A drawing hole for the lower roller assembly to pass through is formed in the right end side plate, when the positioning end plate and the left end plate are detached, the drawing end plate carries the lower roller body, the sliding mechanism and the positioning end plate to be drawn out of the drawing hole, and the drawing hole does not interfere with the drawn-out lower roller assembly. The lower roller assembly is reasonable in structural design, and when the lower roller needs to be maintained and replaced, the lower roller assembly can be integrally pulled out and then disassembled and maintained through pulling operation. The lower roller assembly can be taken out without hoisting, compared with the mode that the lower roller is directly disassembled between the original side plates, the disassembly operation of the lower roller assembly disassembled after being pulled out is not limited by space, and disassembly and replacement operation are easier.

Description

Technical Field

[0001] This utility model relates to the field of battery cell manufacturing technology, and in particular to a pull-out tension isolation device. Background Technology

[0002] The electrode tension isolation component is a key functional module in lithium battery electrode production equipment. Its core function is to precisely isolate or adjust the tension transmission of the electrode in different process stages, so as to avoid electrode deformation, breakage or coating defects caused by tension fluctuations, thereby ensuring the stability and consistency of electrode processing.

[0003] Existing electrode tension isolation assemblies, positioned between different process stages, typically consist of an upper roller and a lower roller. The upper roller is driven to rotate, while the lower roller is adjustable relative to it. During tension isolation and control, the electrode passes through the gap between the upper and lower rollers. A motor or cylinder drives the lower roller to adjust the gap between it and the upper roller, achieving dynamic isolation and adjustment of the electrode tension. In this process, the lower roller usually employs a rubber roller design or a design with a rubber sleeve covering the mandrel. After a certain working time, the rubber roller or sleeve may experience surface aging and cracking, requiring timely replacement. Otherwise, it will not only affect the tension isolation effect but also cause friction and scratching of the electrode surface, significantly impacting the quality of the finished electrode. Furthermore, existing lower rollers using an integrated stepped roller are only suitable for one corresponding electrode width; changing the electrode specification requires replacing the lower roller with one of the corresponding specifications.

[0004] Currently, in existing electrode tension isolation assemblies, the upper and lower rollers are positioned and supported at both ends by side plates. During online roller changes, the limited space between the lower roller end and the side plate creates a problem of confined manual operation space, making it difficult to remove the lower roller from the side plate. Manually removed lower rollers then require a lifting mechanism to be hoisted out of the tension isolation assembly. Reinstalling the lower roller after maintenance requires repeating the hoisting and installation process. Due to space and tool limitations, the lower roller maintenance process is cumbersome, resulting in significant downtime and impacting the continuity of electrode production.

[0005] The key focus of the improved design of the electrode tension isolation assembly is to further improve the existing assembly to make the lower roller maintenance more convenient and quick. Utility Model Content

[0006] The technical problem to be solved by this utility model is: in order to overcome the shortcomings of the prior art, this utility model provides a pull-out tension isolation component assembly. It adopts a pull-out structural design. Relative to one side plate, the lower roller assembly can be pulled out as a whole from the other side plate for maintenance and replacement. No hoisting operation is required, and the maintenance and replacement process is convenient and quick.

[0007] The technical solution adopted by this utility model to solve its technical problem is: a pull-out tension isolation device, including a left side plate, a right side plate, an upper roller assembly, and a lower roller assembly; the upper roller assembly is positioned between the left side plate and the right side plate; a positioning track is provided between the left side plate and the right side plate corresponding to the lower part of the upper roller assembly; the lower roller assembly is located between the upper roller assembly and the positioning track, including a positioning end plate, a pull-out end plate, and a lower roller body; the lower roller body is located between the positioning end plate and the pull-out end plate; a sliding mechanism is provided at each end of the lower roller assembly corresponding to the lower roller body; the sliding mechanism slides with the positioning track; the positioning end plate is detachably connected to the left side plate; and a pull-out hole is opened on the right side plate for the lower roller assembly to pass through. When the positioning end plate is detached from the left side plate, the pull-out end plate carries the lower roller body, the sliding mechanism, and the positioning end plate together and pulls them out from the pull-out hole; the pull-out hole does not interfere with the pulled-out lower roller assembly.

[0008] In the above solution, to address the issue of the difficulty in replacing the original lower roller assembly, the lower roller assembly is designed as a side-pull-out structure relative to the side plate. The positioning track and the sliding mechanism work together in a sliding support manner. During positioning, the positioning track provides support for the lower roller assembly, and during pulling, it acts as a guide for sliding. The sliding mechanism slides along the positioning track, causing the lower roller assembly above it to move synchronously. The lower roller assembly is pulled outward from the pull-out hole on the right side plate, allowing for convenient and quick removal from the line without the need for clamps or hoisting.

[0009] Furthermore, the sliding mechanism includes a pulley and a slide block. The slide block is fixed to a corresponding positioning end plate or pull-out end plate, and the pulley is rotatably mounted on the slide block. The positioning track is a positioning light column with an arc-shaped upper surface. The pulley is a wheel-shaped structure with an arc-shaped groove on its outer surface. This wheel-shaped structure is rotatably mounted on the slide block, and the arc-shaped groove rolls into contact with the outer circumferential surface of the positioning light column. This rolling contact between the arc-shaped groove and the outer circumferential surface of the positioning light column allows the pulley to slide freely relative to the positioning light column. Furthermore, from the perspective of upper and lower support, the arc-shaped groove effectively increases the contact area between the pulley and the positioning light column, enabling the positioning light column to more effectively and stably support the lower roller assembly above.

[0010] Furthermore, the right end of the positioning light column extends outward from the right side plate and has an extension portion.

[0011] Furthermore, to address the need for a certain degree of adjustability in the lower roller body during tension interruption, the lower roller assembly is symmetrically equipped with gap adjustment mechanisms corresponding to the positioning end plate and the pull-out end plate. These gap adjustment mechanisms include an adjusting cylinder, an adjusting push block, a positioning clamping block, and an adjusting plate. The adjusting plate is slidably mounted on the positioning end plate or the pull-out end plate, and a positioning clamping block is fixed to the adjusting plate. The adjusting cylinder is positioned correspondingly on the left or right side plate, with its output end pointing towards the corresponding side end of the lower roller body. The adjusting push block is fixed to the output end of the adjusting cylinder. A horizontally penetrating groove is formed on the positioning clamping block, and the adjusting push block is limited in the height direction within this groove, with an adjustable gap between the adjusting push block and the upper and lower inner walls of the groove in the height direction.

[0012] Preferably, in order to facilitate the pulling and ensure that no interference occurs when the lower roller assembly is pulled out, the positioning end plate and the adjusting plate are both provided with sliding grooves. When pulling out, the sliding grooves on the positioning end plate, the adjusting plate and the positioning clamp block form a channel for the adjusting push block to pass through. This channel does not interfere with the adjusting push block and the output end of the adjusting cylinder.

[0013] Furthermore, the gap adjustment mechanism also includes an adjustment guide rail and an adjustment slider. The adjustment guide rail is fixedly mounted on the positioning end plate or the pull-out end plate, and the adjustment slider is slidably mounted on the adjustment guide rail. The corresponding adjustment plate is fixedly positioned to the adjustment slider. The adjustment slider slides up and down along the height direction. When the adjustment slider slides to the lowest point of its stroke, the lower end face of the adjustment slider is supported and limited by the slide block. Thus, the slide block has a dual function: on the one hand, it provides a reference and positioning for the positioning and installation of the pulley; on the other hand, it also sets a lower limit for the stroke of the adjustment slider. This ensures that the adjusting plate, which slides up and down under the action of the adjusting cylinder, is effectively restricted in the lower stroke position during its up and down movement, preventing it from sliding off.

[0014] Preferably, in order to facilitate the removal of the lower roller assembly, a pull handle is fixed to the outer end face of the pull-out end plate, so that the lower roller assembly can be pulled out from the side during disassembly.

[0015] Furthermore, the lower roller body includes a mandrel and several rubber sleeve assemblies positioned on the mandrel. The mandrel surface has a keyway, and the inner wall of each rubber sleeve assembly has a key that mates with the keyway. Both ends of each rubber sleeve assembly are provided with clamps to position and fix the rubber sleeve to the mandrel. The rubber sleeve assembly and mandrel are separate components, allowing for the use of the same mandrel to accommodate rubber sleeve assemblies of different lengths according to the electrode width requirements. The keyway connection between the rubber sleeve assembly and the mandrel effectively positions them, preventing twisting after positioning.

[0016] Furthermore, in order to facilitate the mating of the rubber sleeve assembly with the keyway of the mandrel, one side of the keyway of the mandrel extends through to the end face of the mandrel.

[0017] Furthermore, the aforementioned sleeve assembly includes several sleeve portions connected axially in sequence. The sleeve assembly is formed by the integral assembly of these sleeve portions, and sleeves of different lengths can be combined according to actual needs to accommodate different electrode widths.

[0018] The beneficial effects of this utility model are that the pull-out tension isolation component provided by this utility model has a reasonable structural design. The lower roller assembly is designed to be pulled outward from the right side plate. When maintenance or replacement of the lower roller is required, the entire lower roller assembly can be pulled out for disassembly and maintenance. Removing the lower roller assembly does not require hoisting. Compared to directly disassembling the lower roller between the original side plates, the disassembly operation is not limited by space and is easier to perform. Attached Figure Description

[0019] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0020] Figure 1 This is a perspective view of an embodiment of the present utility model.

[0021] Figure 2 This is a bottom view of an embodiment of the present utility model.

[0022] Figure 3 yes Figure 2 Enlarged partial sectional view of AA.

[0023] Figure 4 This is a schematic diagram of the present invention after removing the upper roller assembly and the right side plate.

[0024] Figure 5 This is a schematic diagram of the positioning end plate in an embodiment of this utility model.

[0025] Figure 6 This is a schematic diagram of the structure of the lower roller body in Embodiment 2 of this utility model.

[0026] Figure 7 This is a schematic diagram of the mandrel structure in Embodiment 2 of this utility model.

[0027] In the figure: 1. Left side plate; 2. Upper roller assembly; 3. Right side plate; 4. Lower roller assembly; 5. Positioning rail; 6. Pull-out end plate; 7. Positioning end plate; 8. Slide seat; 9. Pulley; 10. Positioning support; 11. Mandrel; 12. Rubber sleeve; 13. Adjusting push block; 14. Adjusting cylinder; 15. Adjusting guide rail; 16. Adjusting plate; 17. Adjusting slider; 18. Positioning clamp; 19. Slide groove; 20. Keyway; 21. Clamp; 22. Extension. Detailed Implementation

[0028] The present invention will now be described in further detail with reference to the accompanying drawings. These drawings are simplified schematic diagrams, illustrating only the basic structure of the present invention. Therefore, they only show the components relevant to the present invention. Orientations and references (e.g., up, down, left, right, etc.) are only used to aid in the description of the features in the drawings. Therefore, the following specific embodiments are not intended to be restrictive, and the scope of the claimed subject matter is defined solely by the appended claims and their equivalents.

[0029] Example 1:

[0030] like Figures 1 to 5 The pull-out tension isolation device shown is an embodiment of this utility model.

[0031] like Figure 1 As shown, the pull-out tension disconnect device includes a left side plate 1, a right side plate 3, an upper roller assembly 2, and a lower roller assembly 4. The upper roller assembly 2 is positioned between the left side plate 1 and the right side plate 3. After assembly, the lower roller assembly 4 is also located between the left side plate 1 and the right side plate 3, and is located below the upper roller assembly 2. Furthermore, there is an adjustable floating gap between the lower roller body of the lower roller assembly 4 and the upper roller.

[0032] Specifically, such as Figure 4 As shown, the lower roller assembly 4 is supported by a positioning track 5 positioned between the left side plate 1 and the right side plate 3, corresponding to the lower roller assembly 2 below. The lower roller assembly 4 includes a positioning end plate 7, a pull-out end plate 6, and a lower roller body. The positioning end plate 7 is detachably positioned and connected to the left side plate 1 by bolts, while the right side plate 3 has a pull-out hole for the lower roller assembly 4 to pass through. A pull-out handle is fixed to the outer end face of the pull-out end plate 6, facilitating lateral force application during disassembly. When the bolts on the positioning end plate 7 and the left side plate are loosened, and the pull-out handle is pulled outward, the pull-out end plate 6, carrying the lower roller body, the sliding mechanism, and the positioning end plate 7, is pulled out through the pull-out hole without interference between the pull-out hole and the lower roller assembly 4.

[0033] like Figure 3 , Figure 4 and Figure 5 As shown, to provide support for the lower roller body during positioning, and to facilitate the sliding and pulling of the lower roller body outward in the pull-out type, the lower roller assembly 4 is also equipped with sliding mechanisms at both ends of the lower roller body. The sliding mechanism includes a pulley 9 and a slide block 8. The slide block 8 is fixed to the corresponding positioning end plate 7 or pull-out end plate 6, and the pulley 9 is rotatably mounted on the slide block 8. The positioning track 5 is a positioning light column, and its two ends are fixed to the left side plate 1 and the right side plate 3, respectively.

[0034] In this embodiment, for force balance, two positioning light columns are designed, with their axes parallel to the upper roller axis and symmetrically arranged on both sides below the upper roller. The upper surface of the positioning light column is an arc-shaped structure. The pulley 9 is a wheel-shaped structure with an arc-shaped groove on its outer surface. This wheel-shaped structure is rotatably mounted on the slide block 8, and the arc-shaped groove rolls in contact with the outer circumference of the positioning light column. The rolling contact between the arc-shaped groove and the outer circumference of the positioning light column allows the pulley 9 to slide unimpeded relative to the positioning light column. Furthermore, from the perspective of upper and lower support, the arc-shaped groove effectively increases the contact area between the pulley 9 and the positioning light column, enabling the positioning light column to more effectively and stably support the lower roller assembly 4 above.

[0035] Meanwhile, to provide better support for the lower roller assembly 4 when it is pulled out, the right end of the positioning light column extends outward from the right side plate 3, having an extension portion 22. To achieve this stable extension, in this embodiment, the positioning light column is positioned and installed between the left side plate 1 and the right side plate 3 by setting a positioning support 10. The positioning support 10 is fixedly installed on the right side wall of the left side plate 1 and the right side plate 3, and the positioning light column is supported and fixed on the positioning support 10. Thus, the right end of the positioning light column extends from the right side wall of the right side plate 3, and the extension portion 22 is supported by the positioning support 10 on the right side wall of the right side plate. When the lower roller assembly 4 is pulled outward to the end, effective support can be provided for the left end of the lower roller assembly 4, that is, the end on the positioning end plate 7 side, which facilitates further disassembly and disassembly.

[0036] The positioning track 5 and the sliding mechanism work together to provide support for the lower roller assembly 4 during positioning. During the pulling process, the positioning track 5 acts as a guide for sliding. The sliding mechanism slides along the positioning track 5, causing the lower roller assembly 4 above it to move synchronously. The lower roller assembly 4 is pulled outward from the pull-out hole of the right side plate 3. The lower roller assembly 4 can be easily and quickly removed from the line without the need for clamps or hoisting.

[0037] For tension isolation applications, the lower roller body needs to have a certain degree of adjustability, such as... Figure 5As shown, the lower roller assembly 4 is symmetrically provided with gap adjustment mechanisms corresponding to the positioning end plate 7 and the pull-out end plate 6. The gap adjustment mechanism includes an adjusting cylinder 14, an adjusting push block 13, a positioning clamping block 18, and an adjusting plate 16. The adjusting plate 16 is slidably disposed on the positioning end plate 7 or the pull-out end plate 6, and the positioning clamping block 18 is fixed on the adjusting plate 16. The adjusting cylinder 14 is positioned correspondingly on the left side plate 1 or the right side plate 3, and the output end of the adjusting cylinder 14 points to the corresponding side end of the lower roller body. The adjusting push block 13 is fixed to the output end of the adjusting cylinder 14. A sliding groove 19 is provided through the positioning clamping block 18 in the horizontal direction. The adjusting push block 13 is limited in the height direction and disposed in the sliding groove 19. The adjusting push block 13 has an adjustment gap with the upper and lower inner walls of the sliding groove 19 in the height direction.

[0038] The gap adjustment mechanism also includes an adjustment guide rail 15 and an adjustment slider 17. The adjustment guide rail 15 is fixed on the positioning end plate 7 or the pull-out end plate 6. The adjustment slider 17 is slidably mounted on the adjustment guide rail 15, and the corresponding adjustment plate 16 is fixedly positioned with the adjustment slider 17. The adjustment slider 17 slides up and down along the height direction. When the adjustment slider 17 slides to the lowest point of its stroke, the lower end face of the adjustment slider 17 is supported and limited by the slide block 8. Thus, the slide block 8 has a dual function: on the one hand, it provides a reference and positioning for the positioning and installation of the pulley 9; on the other hand, it also sets a lower limit for the stroke of the adjustment slider 17, so that the adjustment plate 16, which slides up and down under the action of the adjustment cylinder 14, can be effectively restricted in the lower stroke position during the up and down movement, preventing it from sliding off.

[0039] Based on the aforementioned gap adjustment mechanism, to facilitate pulling out and ensure no interference occurs when the lower roller assembly 4 is pulled out, both the positioning end plate 7 and the adjusting plate 16 have sliding grooves 19. In actual design, the sliding grooves 19 can adopt a C-shaped groove structure design. During pulling out, the sliding grooves 19 on the positioning end plate 7, the adjusting plate 16, and the positioning clamping block 18 form a channel for the adjusting push block 13 to pass through, and this channel does not interfere with the adjusting push block 13 and the output end of the adjusting cylinder 14.

[0040] This pull-out tension isolation component features a rationally designed structure. The lower roller assembly 4 is designed to be pulled outward from the right side plate 3. When maintenance or replacement of the lower roller is required, the entire lower roller assembly 4 can be pulled out for disassembly and maintenance. Removing the lower roller assembly 4 does not require hoisting. Compared to directly disassembling the lower roller between the original side plates, the removal of the lower roller assembly 4 is not limited by space, making disassembly and replacement easier and improving maintenance and replacement efficiency.

[0041] Example 2:

[0042] In Embodiment 2 of this utility model, the lower roller body of the pull-out tension disconnect device is as follows: Figure 6and Figure 7 As shown. Example 2, based on Example 1, further improves the structure of the lower roller body.

[0043] Specifically, the lower roller body includes a spindle 11 and several rubber sleeve assemblies positioned on the spindle 11. The surface of the spindle 11 has a keyway 20. The inner wall of the rubber sleeve assembly is fitted with a key that engages with the keyway 20 on the surface of the spindle 11. Both ends of the rubber sleeve assembly are respectively provided with clamps 21 that position and fix the rubber sleeve to the spindle 11.

[0044] The rubber sleeve assembly and the mandrel 11 are separate components, allowing the same mandrel 11 to accommodate rubber sleeve assemblies of different lengths according to the electrode width requirements. The rubber sleeve assembly and the mandrel 11 are engaged by a keyway 20, which effectively positions them and prevents twisting after positioning. To facilitate the engagement of the rubber sleeve assembly and the keyway 20 of the mandrel 11, one side of the keyway 20 extends to the end face of the mandrel 11. Considering ease of disassembly, the end face to which the keyway 20 extends is typically designated as the entry face of the rubber sleeve assembly. The key of the rubber sleeve assembly is pushed in from this end, engaging with the keyway 20, until it reaches the desired position.

[0045] The sleeve assembly includes several sleeve portions 12 connected axially in sequence. The sleeve assembly is formed by assembling the sleeve portions 12 separately, and sleeves of different lengths can be combined according to actual needs to accommodate different electrode widths.

[0046] During installation, the rubber sleeve assembly is positioned and positioned in conjunction with the keyway 20 and the spindle 11, and then secured to the spindle 11 from both ends using clamps 21. Thus, while the lower roller assembly 4 can be easily removed from the side plate via a pull-out structure, the lower roller body within the lower roller assembly 4 also adopts a separate structure of the spindle 11 and the rubber sleeve assembly, allowing for the selection of different length combinations of rubber sleeves depending on the electrode width. The grouped and spaced rubber sleeve assemblies can simultaneously perform tension-breaking operations on multiple electrode widths on the same spindle 11, facilitating easy disassembly and assembly, allowing for replacement as needed, and simplifying maintenance. Furthermore, this expands the applicability of the tension-breaking device and has a promising market prospect.

[0047] Based on the above-described preferred embodiments of this utility model, and through the foregoing description, those skilled in the art can make various changes and modifications without departing from the technical concept of this utility model. The technical scope of this utility model is not limited to the contents of the specification, but must be determined according to the scope of the claims.

Claims

1. A pull tension breakaway device characterized by: It includes a left side plate, a right side plate, an upper roller assembly, and a lower roller assembly; the upper roller assembly is positioned between the left and right side plates; a positioning track is provided between the left and right side plates below the upper roller assembly. The lower roller assembly is disposed between the upper roller assembly and the positioning track, and includes a positioning end plate, a pull-out end plate, and a lower roller body. The lower roller body is disposed between the positioning end plate and the pull-out end plate. The lower roller assembly is also provided with sliding mechanisms at both ends below the lower roller body. The sliding mechanisms are slidably engaged with the positioning track. The positioning end plate is detachably connected to the left end plate, and the right end plate has a pull-out hole for the lower roller assembly to pass through. When the positioning end plate is detached from the left end plate, the pull-out end plate carries the lower roller body, the sliding mechanism, and the positioning end plate together and is pulled out from the pull-out hole. The pull-out hole does not interfere with the pulled-out lower roller assembly.

2. A pull tension breakaway device as claimed in claim 1, wherein: The sliding mechanism includes a pulley and a slide base. The slide base is fixed to a corresponding positioning end plate or pull-out end plate, and the pulley is rotatably mounted on the slide base. The positioning track is a positioning light column with an arc surface structure on its upper surface. The pulley is a wheel-shaped structure with an arc-shaped groove on its outer surface. The wheel-shaped structure is rotatably mounted on the slide base, and the arc-shaped groove rolls in cooperation with the outer circumferential surface of the positioning light column.

3. A pull tension breakaway device as claimed in claim 2, wherein: The right end of the positioning light column extends outward from the right side plate and has an extension portion.

4. A pull tension stop device as claimed in claim 2, wherein: The lower roller assembly is symmetrically provided with gap adjustment mechanisms corresponding to the positioning end plate and the pull-out end plate. The gap adjustment mechanism includes an adjustment cylinder, an adjustment push block, a positioning clamping block, and an adjustment plate. The adjustment plate is slidably mounted on the positioning end plate or the pull-out end plate, and the positioning clamping block is fixed on the adjustment plate. The adjustment cylinder is positioned on the left side plate or the right side plate, and the output end of the adjustment cylinder points to the corresponding side end of the lower roller body. The adjustment push block is fixed to the output end of the adjustment cylinder. A sliding groove is formed through the positioning clamping block in the horizontal direction. The adjustment push block is limited in the height direction and is set in the sliding groove. The adjustment push block has an adjustment gap with the upper and lower inner walls of the sliding groove in the height direction.

5. A pull tension stop device as claimed in claim 4, wherein: The positioning end plate and the adjusting plate both have sliding grooves. When pulled out, the sliding grooves on the positioning end plate, the adjusting plate and the positioning clamp block form a channel for the adjusting push block to pass through. This channel does not interfere with the adjusting push block and the output end of the adjusting cylinder.

6. A pull tension stop device as claimed in claim 4, wherein: The gap adjustment mechanism further includes an adjustment guide rail and an adjustment slider. The adjustment guide rail is fixedly fixed on the positioning end plate or the pull-out end plate, and the adjustment slider is slidably disposed on the adjustment guide rail. The adjustment plate on the corresponding side is fixedly positioned with the adjustment slider. The adjusting slider slides up and down along the height direction. When the adjusting slider slides to the lowest point of its stroke, the lower end of the adjusting slider is supported and limited by the slide block.

7. A pull tension stop device as claimed in claim 1, wherein: A pull handle is fixed to the outer end face of the pull-out end plate.

8. A pull tension stop device as claimed in claim 1, wherein: The lower roller body includes a mandrel and several rubber sleeve assemblies positioned on the mandrel. The mandrel has a keyway on its surface, and the inner wall of the rubber sleeve assembly has a key that mates with the keyway on the mandrel surface. Both ends of the rubber sleeve assembly are respectively provided with clamps to position and fix the rubber sleeve to the mandrel.

9. A pull tension stop device as claimed in claim 8, wherein: One side of the keyway of the mandrel extends to the end face of the mandrel.

10. A pull tension stop device as claimed in claim 8, wherein: The aforementioned rubber sleeve assembly includes several rubber sleeve portions connected axially in sequence.

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