A stripping mechanism

Abstract

The present invention relates to a stripping mechanism, including a stripping piece, wherein the stripping piece has an inserting portion for inserting between a punch and a battery shell wrapped at the lower part of the punch and abutting against the inner wall portion of a material head at the upper part of the battery shell, a floating piece whose lower surface portion can abut against the upper end of the material head and an elastic piece that always has a tendency to make the floating piece push the battery shell to move downward relative to the punch are arranged on the outer side of the inserting portion, and the floating piece is a floating ring that is sleeved outside the inserting portion and is annular; the stripping piece is provided with a supporting portion for limiting the floating piece from continuing to move downward at a position corresponding to the floating piece, and a gap is formed between the supporting portion and the inserting portion for the material head at the upper end of the battery shell to penetrate. In the process of the punch moving upward, the inserting portion abuts against the inner wall portion of the material head of the battery shell, so that in the process of the punch moving upward, the periphery of the battery shell is subjected to uniform force, thereby reducing the phenomenon of twisting and bulging of the peripheral wall of the battery shell.

Description

Technical Field

[0001] The invention belongs to the technical field of batteries, and in particular relates to a stripping mechanism for a battery outer shell. Background Art

[0002] Steel case battery is a common high-performance lithium-ion battery with energy density, long cycle life, good rate performance and safety performance. It is mainly used in mobile electronic products and power fields. When producing steel case batteries, in order to ensure the structural integrity of the steel shell, a continuous multi-station step-by-step stretching method is usually used to process the outer shell. The outer shell is usually a steel shell. The multi-station step-by-step stretching method is a process in which the diameter gradually decreases and the height gradually increases. The steel shells of each station are conveyed by automatic feeding using a reciprocating manipulator. Before feeding, the steel shell 6' must be removed from the punch. When the steel shell 6' is located in the punch 5', the steel shell 6' is usually located at the bottom of the punch 5', and the upper end of the steel shell 6' has a material head 61' with an expanded diameter. For details, see Figures 7 to 9 shown.

[0003] At present, stripping ring 1' or stripping plate is usually used for stripping, and stripping ring 1' is fixed on fixing member 2'. Figure 1 As shown, the steel shell 6' is tightly wrapped on the surface of the punch 5' after being stretched and formed by the interaction between the punch 5' and the die; the steel shell 6' moves upward along with the punch 5', and when it moves upward to the stripping end surface 11' of the stripping ring 1', it abuts against the upper end of the steel shell head 61', see Figure 2 as shown; Figure 3 As shown, since the stripping sleeve is fixed in position, if the punch continues to move upward, the stripping end surface 11' of the stripping ring 1' will forcibly separate the steel shell 6' from the surface of the punch 5' until the two are completely separated. This is the so-called stripping process.

[0004] Under the influence of many factors such as the tensile properties, the performance of the material itself, the setting of the stretch ratio and the surface condition of the mold, the end surface of the steel shell head 61' is not an ideal plane, but has certain ups and downs, which is the so-called "ear" phenomenon, see Figure 4 As shown in the figure, the serious "bulging ear" phenomenon will have an adverse effect on the shell wall of the steel shell 6' during the stripping process. The ideal and flat end surface of the steel shell head 61' can make the periphery of the steel shell 6' evenly bear the extrusion force f during the stripping process, so as to complete the stripping smoothly; when there is a bulging ear, when the stripping starts, as shown in the figure, the bulging ear is not formed, and the bulging ear is formed. Figure 5 As shown, since the highest point A of the lug is the first to contact the stripping end surface, the steel shell 6' is subjected to unilateral force. Under the action of the unilateral force, the steel shell 6' has the following Figure 5The twisting trend in the direction shown; at the beginning of the stripping, due to the support restriction of the punch 5', this unilateral twisting trend has no effect on the steel shell 6', but when the stripping is coming to an end, that is, when the steel shell 6' is about to leave the punch 5', the support restriction of the punch 5' on the steel shell 6' is greatly reduced. When the twisting is serious, the steel shell 6' cylinder body will be lifted up by the end face of the punch 5', causing the steel shell 6' cylinder body near the upper mouth to bulge outward, see Figure 6 shown.

[0005] Therefore, it is necessary to further improve the existing stripping mechanism. Summary of the invention

[0006] The first technical problem to be solved by the present invention is to provide a stripping mechanism for eliminating the bulging of the battery shell peripheral wall by changing the position of the stripping piece acting on the battery shell material head during stripping, so that the periphery of the battery shell is evenly stressed during the stripping process.

[0007] The second technical problem to be solved by the present invention is to provide a stripping mechanism for smoothly conveying the battery casing separated from the stripping piece.

[0008] The technical solution adopted by the present invention to solve the above-mentioned first technical problem is: a stripping mechanism, including a stripping piece, wherein a through hole for accommodating a punch and for the punch to pass through when moving upward relative to the stripping piece is formed inside the stripping piece, characterized in that:

[0009] The stripping member has an inserting portion for inserting between the male mold and the battery shell wrapped at the lower part of the male mold and abutting against the inner wall portion of the material head at the upper part of the battery shell, and the outer side of the inserting portion is provided with a floating member whose lower surface portion can abut against the upper end of the material head and an elastic member that always has the tendency to make the floating member push the battery shell to move downward relative to the male mold, and the floating member is a floating ring that is sleeved outside the inserting portion and is annular;

[0010] The stripping member is provided with a support portion for limiting the floating member from further moving downward at a position corresponding to the floating member, and a gap is formed between the support portion and the plug-in portion for the material head at the upper end of the battery housing to penetrate.

[0011] In order to facilitate insertion between the punch and the battery shell, the plug-in part is a cylindrical structure, and the lower part of the plug-in part has an inclined surface that gradually tilts inward from top to bottom and can abut against the inclined surface of the inner wall of the material head. In this way, the inclined surface is the stripping end surface of the plug-in part. During the upward movement of the punch, the battery shell may bend upward during the downward movement of the battery shell under the action of the floating part. The existence of the inclined surface of the plug-in part can press the battery shell downward with the inclined surface of the inner wall of the hopper to the inner wall. On the one hand, it is convenient to separate the battery shell from the punch during the upward movement of the punch; on the other hand, it reduces the uniformity of the battery shell body.

[0012] The technical solution adopted by the present invention to solve the above-mentioned second technical problem is: the support part is located below the floating part, and the stripping part forms a space for avoiding the transportation of the battery shell that has separated from the stripping part, and the upper end surface of the support part is located below the lower end surface of the plug-in part.

[0013] The support part can be arranged on a U-shaped plate located on the outside of the stripping piece, or on two strip plates arranged relatively at intervals. For the convenience of processing, preferably, two strip plates arranged relatively at intervals are arranged on the outside of the stripping piece, and the support part is arranged on the lower part of the strip plates, and the space is formed between the two support parts.

[0014] In order to increase the connection firmness of the strip plate, preferably, the strip plate has a limiting step for supporting the ring seat at a position near the middle, and when the strip plate is installed on the ring seat, the upper surface of the limiting step abuts against part of the lower surface of the ring seat. There are many structural forms of the plug-in part, which can be in the form of an integral cylindrical structure or in the form of an annular plug-in part formed by an interval arrangement. In order to make the periphery of the battery shell evenly stressed during the stripping process, preferably, the stripping piece includes a ring seat, the plug-in part is arranged on the bottom surface of the ring seat and extends downward, the ring seat and the plug-in part are correspondingly provided with the above-mentioned through holes, and the elastic member is located on the outside of the plug-in part and between the lower surface of the ring seat and the floating member.

[0015] In order to enable the floating ring to better push the material head at the upper end of the battery housing downward relative to the punch under the action of the elastic member, preferably, there are at least three elastic members, which are arranged between the ring seat and the floating ring at intervals along the circumference of the floating ring.

[0016] The elastic member can be in the form of a spring or a spring sheet. Preferably, the elastic member is a spring arranged between the lower surface of the ring seat and the upper surface of the floating ring, one end of the spring is connected to the lower surface of the ring seat, and the other end of the spring is connected to the upper surface of the floating ring.

[0017] In order to facilitate the accommodation of the elastic member and increase the firmness of the connection of the elastic member, preferably, a first spring hole is opened on the upper surface of the floating ring at the position corresponding to the spring, and a second spring hole is opened on the lower surface of the ring seat at the position corresponding to the spring, and the two ends of the spring are respectively accommodated in the corresponding first spring hole and the second spring hole, and the two ends of the spring can respectively abut against the corresponding end wall of the first spring hole and the end wall of the second spring hole.

[0018] In order to facilitate the installation of the stripping piece on the fixing piece, preferably, a groove for inserting the flange portion of the fixing piece is provided on the outer peripheral wall of the ring seat, and there are two grooves which are arranged relatively spaced apart.

[0019] Compared with the prior art, the advantages of the present invention are: the plug-in portion on the stripping piece of the stripping mechanism can be inserted between the punch and the battery shell wrapped under the punch, and the plug-in portion can be abutted against the inner wall portion of the material head on the upper part of the battery shell. When a lug appears on the top of the battery shell material head, the floating piece abuts against the top surface of the material head under the elastic action of the elastic piece, and in the process of the punch moving upward, the plug-in portion abuts against the inner wall portion of the battery shell material head, so that in the process of the punch moving upward, the periphery of the battery shell is subjected to uniform force, thereby reducing the phenomenon of torsional bulging of the peripheral wall of the battery shell; in addition, when the battery shell is completely separated from the punch, the floating piece can push the battery shell to move downward under the elastic reset action of the elastic piece and completely separate from the stripping mechanism, thereby realizing the stripping of the battery shell; in addition, the upper end face of the support portion is lower than the lower end face of the stripping ring, that is, the lower end face of the floating piece located on the support portion is lower than the lower end face of the stripping ring, and the battery shell can be completely separated from the stripping ring under the push of the floating piece, thereby creating conditions for smoothly transporting the battery shell. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a schematic diagram of the structure of removing materials through a stripping ring in the background technology;

[0021] Figure 2 for Figure 1 A schematic diagram of the structure in which the battery housing is partially separated from the male mold;

[0022] Figure 3 for Figure 1 Schematic diagram of the structure in which the battery housing is completely separated from the male mold;

[0023] Figure 4 It is a schematic structural diagram of a battery housing having a lug through a stripping head of a stripping ring in the background technology;

[0024] Figure 5 for Figure 4 A schematic diagram of the structure in which the battery housing is partially separated from the male mold;

[0025] Figure 6 for Figure 4 Schematic diagram of the structure in which the battery housing is partially separated from the male mold (the battery housing is twisted);

[0026] Figure 7 It is a structural schematic diagram of a battery housing in the background technology;

[0027] Figure 8 It is a schematic diagram of the structure of the material head at the upper end of the battery housing in the background technology;

[0028] Fig. 9 It is a schematic diagram of another structural form of the material head at the upper end of the battery housing in the background technology;

[0029] Fig.10 It is a structural schematic diagram of a stripping mechanism according to an embodiment of the present invention installed on a fixing member;

[0030] Fig.11 It is a structural schematic diagram of a stripping mechanism according to an embodiment of the present invention;

[0031] Fig.12 for Fig.11 Schematic diagram of the three-dimensional decomposition structure;

[0032] Fig.13 for Fig.11 A schematic diagram of a three-dimensional decomposition structure from another angle;

[0033] Fig.14 for Fig.11 sectional view of

[0034] Fig.15 It is a structural schematic diagram of the state where the punch is installed in the through hole;

[0035] Fig.16 It is a schematic diagram of the structure in which the plug-in portion is inserted between the male die and the material head in an embodiment of the present invention;

[0036] Fig.17 It is a schematic diagram of the structure in which the plug-in portion and the inner wall of the material head are in a state of abutting against each other in an embodiment of the present invention;

[0037] Fig.18 for Fig.17 A schematic diagram of the enlarged structure of the middle part A;

[0038] Fig.19 This is a schematic diagram of the structure of a battery housing in an embodiment of the present invention when the battery housing is partially separated from the male mold;

[0039] Fig. 20 This is a schematic diagram of the structure of the battery housing in an embodiment of the present invention when it is completely separated from the male mold;

[0040] Fig.21 The schematic diagram of the structure of the battery housing in the embodiment of the present invention is a state where the battery housing is completely separated from the stripping mechanism.

[0041] Fig. 22 It is a schematic diagram of the structure in which the battery housing is located below the stripping mechanism in an embodiment of the present invention;

[0042] Fig.23 for Fig.21 Schematic diagram of the enlarged structure of part B in the middle. DETAILED DESCRIPTION

[0043] The present invention is further described in detail below with reference to the accompanying drawings.

[0044] like Figures 10 to 23 As shown, the stripping mechanism of the embodiment of the present invention includes a stripping member 1, a strip plate 2, a floating member 3 and an elastic member 4.

[0045] like Figures 10 to 13 As shown, the stripping member 1 is a stripping ring with an annular structure. A through hole 1a is formed inside the stripping member 1 to accommodate the punch 5 and allow the punch 5 to pass through when moving upward relative to the stripping member 1. Specifically, the stripping member 1 includes a ring seat 12 and an inserting portion 11 arranged on the bottom surface of the ring seat 12. A groove 123 is opened on the outer wall of the ring seat 12. There are two grooves 123 in this embodiment, and the two grooves 123 are arranged opposite to each other. In order to fix the stripping member 1 on the fixing member 7, a flange 71 is provided on the inner wall of the fixing member at a position corresponding to the groove 123, see Fig.10 As shown, the stripping piece 1 is installed with the fixing piece 7 by plugging and fitting the groove 123 with the corresponding flange 71 .

[0046] The plug-in portion 11 is a cylindrical structure, which is arranged on the bottom surface of the ring seat 12 and extends downward. The ring seat 12 and the plug-in portion 11 are correspondingly provided with the above-mentioned through holes 1a. The battery housing 6 is usually wrapped at the lower position of the outer wall of the punch 5, and the upper end of the battery housing 6 has a head 61 with an increased diameter. The above-mentioned plug-in portion 11 can be inserted between the punch 5 and the battery housing 6 wrapped at the lower part of the punch 5. Specifically, the plug-in portion 11 can be inserted between the punch 5 and the head 61 of the battery housing 6, and the outer wall of the plug-in portion 11 can be against the inner wall of the head 61 at the upper part of the battery housing 6. For details, see Figures 17 to 20As shown, when the punch 5 wrapped with the battery shell 6 moves upward relative to the stripping ring and is in the stripping state, the lower end surface of the floating part 2 abuts against the upper end of the material head 61 of the battery shell 6, and the plug-in part 11 abuts against part of the inner wall of the material head 61 of the battery shell. In order to better achieve the abutment between the plug-in part 11 and the inner wall of the material head 61 of the battery shell 6, the lower part of the plug-in part 11 has an inclined surface 111 that gradually tilts inward from top to bottom and can abut against the inclined surface of the inner wall of the material head 61. In this embodiment, the inclined surface 111 is consistent with the inclination direction and angle of the inner wall of the material head 61, and the inclined surface 111 can fit with part of the inner wall of the material head 61; in the above, there are many ways to achieve the upward movement of the punch 5 relative to the stripping piece 1, as long as the upward movement of the punch 5 relative to the stripping piece 1 can be achieved.

[0047] The floating member 3 is located on the outside of the plug-in portion 11. The floating member 3 in this embodiment is a floating ring structure that is sleeved outside the plug-in portion 11 and is in an annular shape. The floating member 3 has a tendency to push the battery housing 6 to move downward relative to the punch 5 under the action of the elastic member 4. The stripping member 1 is provided with a support portion 21 at a position corresponding to the floating member 3 to limit the floating member 3 from continuing to move downward. The support portion 21 is located below the floating member 3. Specifically, two relatively spaced strip plates 2 are provided on the outside of the stripping member 1. In this embodiment, the two strip plates 2 are located on the left and right sides of the stripping ring. For details, see Fig.11 As shown; and the lower part of the two strip plates 2 is provided with the above-mentioned support portion 21; in order to facilitate the conveying of the battery shell, a space 21c is formed between the support portions 21 on the two strip plates 2 on the stripping member 1 to avoid the conveying of the battery shell 6 that is separated from the stripping member 1, see Fig. 22 As shown, that is, the space 21c is the space in the conveying direction of the battery shell. The conveying direction of the battery shell in this embodiment is along the front and rear direction of the stripping ring. For details, see Fig.13 and the upper end surface of the support portion 21 is located below the lower end surface of the plug-in portion 11, that is, the lower end surface of the floating ring is lower than the lower end surface of the plug-in portion 11, see Fig.21 and Fig.23 When the battery housing 6 is completely separated from the male mold 5, see Fig. 20As shown, the plug-in portion 11 of the stripping ring is inserted between the punch 5 and the material head 61 of the battery shell 6. Since the plug-in portion 11 of the stripping ring is fixed and the lower end surface of the floating ring is lower than the lower end surface of the plug-in portion 11, the floating ring pushes the battery shell 6 downward under the action of the elastic member to prevent the battery shell 6 from being limited by the plug-in portion 11 and being tripped during the subsequent transportation of the battery shell by the manipulator, that is, to prevent the battery shell 6 from being tripped by the stripping ring and causing an accident. The lower end surface of the floating ring is lower than the lower end surface of the plug-in portion 11, which reduces the possibility of the battery shell 6 being tripped by the stripping ring, facilitates the transportation of the battery shell by the manipulator, and creates conditions for the subsequent smooth transportation of the battery shell. For the transportation direction of the battery shell, see Fig.13 The arrow in the middle points to the anterior-posterior direction.

[0048] In order to facilitate the upper end surface of the material head 61 of the battery housing 6 to abut against the bottom surface of the floating member 3 , a gap 1 b is formed between the support portion 21 and the insertion portion 11 for the material head 61 at the upper end of the battery housing 6 to penetrate.

[0049] In order to facilitate the installation of the above-mentioned strip plate 2 on the ring seat 11, a limiting step 22 for supporting the ring seat 12 is provided at a position near the middle of the strip plate 2. When the strip plate 2 is installed on the ring seat 12, the upper surface of the limiting step 22 is abutted against a portion of the lower surface of the ring seat 12, and corresponding assembly holes 100 for installing the connecting member 8 are opened on the corresponding sides of each strip plate 2 and the ring seat 12. Each strip plate 2 has two assembly holes 100, which are arranged at intervals up and down; the strip plate 2 is installed in the corresponding assembly hole 100 through the connecting member 8 to achieve a fixed connection with the ring seat 12.

[0050] like Figures 10 to 23 As shown, the elastic member 4 is located outside the plug-in portion 11 and between the lower surface of the ring seat 12 and the floating member 3; there are at least three elastic members 4, which are arranged between the ring seat 12 and the floating ring at intervals along the circumference of the floating ring. In this embodiment, there are four elastic members 4, see Fig.12 and Fig.13 As shown. The elastic member 4 is a spring disposed between the lower surface of the ring seat 12 and the upper surface of the floating ring, one end of the spring is connected to the lower surface of the ring seat 12, and the other end of the spring is connected to the upper surface of the floating ring. In order to conveniently accommodate the spring, a first spring hole 31 is provided on the upper surface of the floating ring at a position corresponding to the spring, and a second spring hole 122 is provided on the lower surface of the ring seat 12 at a position corresponding to the spring. The two ends of the spring are respectively accommodated in the corresponding first spring hole 31 and the second spring hole 122, and the two ends of the spring can respectively abut against the corresponding end wall of the first spring hole 31 and the end wall of the second spring hole 122.

[0051] like Fig.14As shown, the floating member 3 can move up and down within the range of △h, △h>0; and the outer diameter of the stripping member is d1, and the distance between the inner end surfaces of the two support parts along the radial direction of the floating ring is d2; Fig. 22 As shown, the inner diameter of the upper end surface of the material head 61 is d4, and the outer diameter of the upper end surface of the material head 61 is d3, wherein d2>d3, d1<d4.

[0052] The stripping process of the stripping mechanism is as follows:

[0053] The punch 5 is inserted into the through hole 1a, and the punch 5 can move upward relative to the stripping member 1. The punch 5 drives the battery housing 1 to move upward until the material head 61 of the battery housing 6 passes through the gap 1a, and the upper end of the material head 61 of the battery housing 6 can be against the bottom surface of the floating member 3, see Fig.15 As shown; the convex mold 5 continues to move upward, the elastic member 4 will be compressed, and the insertion portion 11 of the stripping member 1 can be inserted between the convex mold 5 and the material head 61 of the battery housing 6, see Fig.16 As shown; during the upward movement of the punch 5 relative to the stripping member 1, the inclined surface of the lower end of the plug-in portion 11 abuts against the inner wall portion of the material head 61, see Figure 17 to Figure 18 As shown; the punch 5 continues to move upward relative to the stripping piece 1 and the stripping process begins, see Fig.19 As shown, the floating member 3 has a tendency to push the material head 61 downward under the action of the elastic member 4, and the plug-in portion 11 also pushes the material head 61 of the battery housing 6 to move downward relative to the punch 5. The floating member 3 and the plug-in portion 11 jointly push the material head 61 to move downward relative to the punch 5, so that the circumferential force of the battery housing 6 is relatively uniform; when the battery housing 6 is completely separated from the punch 5, see Fig. 20 As shown, the floating member 3 pushes the battery housing 6 downward relative to the stripping member 1 under the action of the elastic member 4. At this time, the battery housing 6 is pushed by the floating member 3 and separates from the stripping mechanism by inertia, thereby completing the entire battery housing stripping process.

Claims

1. A stripping mechanism, comprising a stripping member (1), wherein the stripping member (1) is provided with a through hole (1a) for accommodating a punch (5) and for allowing the punch (5) to move upward relative to the stripping member (1) and pass through, characterized in that: The stripping member (1) has an inserting portion (11) which is inserted between the male mold (5) and the battery housing (6) wrapped around the lower part of the male mold (5) and can abut against the inner wall portion of the material head (61) at the upper part of the battery housing (6); the outer side of the inserting portion (11) is provided with a floating member (3) whose lower surface can abut against the upper end of the material head (61) and an elastic member (4) which always has the tendency to make the floating member (3) push the battery housing (6) to move downward relative to the male mold (5); the floating member (3) is a floating ring which is sleeved outside the inserting portion (11) and is in an annular shape; The floating member (3) can move up and down relative to the plug-in portion (11); The stripping member (1) is provided with a support portion (21) at a position corresponding to the floating member (3) for limiting the floating member (3) from continuing to move downward, and a gap (1b) is formed between the support portion (21) and the plug-in portion (11) for the material head (61) at the upper end of the battery housing (6) to penetrate.

2. The stripping mechanism according to claim 1, characterized in that: The plug-in portion (11) is a cylindrical structure, and the lower portion of the plug-in portion (11) has an inclined surface (111) which gradually inclines inward from top to bottom and can abut against the inclined surface of the inner wall portion of the material head (61).

3. The stripping mechanism according to claim 1, characterized in that: The support portion (21) is located below the floating member (3), and the stripping member (1) forms a space (21c) for avoiding the transportation of the battery casing (6) separated from the stripping member (1), and the upper end surface of the support portion (21) is located below the lower end surface of the plug-in portion (11).

4. The stripping mechanism according to claim 3, characterized in that: Two strip plates (2) arranged at a distance from each other are arranged on the outer side of the stripping member (1), the lower part of each strip plate (2) is provided with the support part (21), and the space (21c) is formed between the two support parts (21).

5. The stripping mechanism according to claim 4, characterized in that: The stripping member (1) includes a ring seat (12), the plug-in portion (11) is arranged on the bottom surface of the ring seat (12) and extends downward, the ring seat (12) and the plug-in portion (11) are correspondingly provided with the above-mentioned through holes (1a), and the elastic member (4) is located on the outside of the plug-in portion (11) and between the lower surface of the ring seat (12) and the floating ring.

6. The stripping mechanism according to claim 5, characterized in that: The strip plate (2) has a limiting step (22) at a position near the middle thereof for supporting the ring seat (12); when the strip plate (2) is installed on the ring seat (12), the upper surface of the limiting step (22) abuts against a portion of the lower surface of the ring seat (12).

7. The stripping mechanism according to claim 5, characterized in that: There are at least three elastic members (4), which are arranged between the ring seat (12) and the floating ring at intervals along the circumference of the floating ring.

8. The stripping mechanism according to claim 7, characterized in that: The elastic member (4) is a spring arranged between the lower surface of the ring seat (12) and the upper surface of the floating ring, one end of the spring is connected to the lower surface of the ring seat (12), and the other end of the spring is connected to the upper surface of the floating ring.

9. The stripping mechanism according to claim 8, characterized in that: A first spring hole (31) is provided on the upper surface of the floating ring at a position corresponding to the spring, and a second spring hole (122) is provided on the lower surface of the ring seat (12) at a position corresponding to the spring. Both ends of the spring are respectively accommodated in the corresponding first spring hole (31) and the second spring hole (122), and the two ends of the spring can respectively abut against the corresponding end wall of the first spring hole (31) and the end wall of the second spring hole (122).

10. The stripping mechanism according to claim 5, characterized in that: The outer peripheral wall of the ring seat (12) is provided with a groove (123) for the flange (71) of the fixing member (7) to be inserted therein, and there are two grooves (123) which are arranged at a relative interval.

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