Upper puller die positioning device
By introducing a diagonal rod, a limiting gear disk, and a rotating rod structure into the upper pull head mold positioning device, the problem of unsuitable hook ring angle adjustment is solved, and a stable positioning effect for different pull head models is achieved.
Patent Information
- Application Number
- CN202520126481.4
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-01-20
- Publication Date
- 2026-01-02
- Estimated Expiration
- 2035-01-20
AI Technical Summary
The existing upper pull-out mold positioning device cannot adjust the hook to a suitable angle when processing pull-outs of different sizes and models, resulting in poor positioning effect.
By setting a diagonal bar, a limiting gear disk, and a rotating rod structure on one side of the hook, the angle of the hook ring can be adjusted and fixed. The angle of the rotating rod can be adjusted and fixed by using the cooperation of the limiting block and the spring.
This technology enables the hook to be adjusted to the ideal angle when processing pull heads of different sizes and models, ensuring the stability of the positioning effect and the normal use of the device.
Smart Images
Figure CN223745882U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to positioning device field, specifically is a kind of upper pull head mould positioning device. BACKGROUND
[0002] Upper pull head mould is a mould for manufacturing zipper pull head, in the production process of zipper, pull head is a key component, and its quality directly affects the use effect of zipper, and the design and manufacture of upper pull head mould are crucial to produce high-quality zipper, and upper pull head mould also needs to install pull safety device on one side in use process, that is, when threading chain, the pull ring on pull head is hooked, the pull hook of the safety of pull head is opened, and the upper pull head mould can achieve use effect.
[0003] The existing upper pull head mould positioning device is movably installed with a group of pull hooks in upper pull head mould, one end of pull hook is fixed in upper pull head mould, pull hook cylinder is arranged on one side of pull hook, hook ring is further arranged on one end of pull hook, pull hook cylinder can drive pull hook to rotate when running, hook ring arranged on one side of pull hook can hook pull ring, prevent pull head from jumping, and can also pull open safety, so that zipper can enter pull head, thereby achieving the positioning effect of upper pull head mould positioning device.
[0004] However, for the existing upper pull head mould positioning device, the existing hook ring can only adjust the length of pull hook, and when processing pull heads of different sizes and models, the hook ring cannot be adjusted to the suitable angle, and the hook ring and the pull ring on the pull head are difficult to achieve ideal contact effect, so that the positioning effect of the device is poor in use process, and the work is affected. UTILITY MODEL CONTENTS
[0005] Therefore, the utility model aims at providing an upper pull head mould positioning device to solve the technical problem of poor use effect of the existing upper pull head mould positioning device.
[0006] To achieve the above object, the utility model provides the following technical scheme: a kind of up-draw head mould positioning device, the top of the up-draw head mould is provided with mould base, one side of the mould base is provided with fixed base, one side of the fixed base is fixedly installed with pull hook cylinder, the up-draw head mould is provided with through slot, the through slot is provided with pull hook, one end of the pull hook is provided with rotating base, the other end of the pull hook is provided with inclined rod, one side of the inclined rod is provided with first limit gear disc, one side of the first limit gear disc is fixedly installed with fixed rod, one end of the fixed rod is provided with first fixed slot, one side of the fixed rod is provided with fixed hole, rotating rod is sleeved on the fixed rod, the two sides of the rotating rod are provided with second limit gear disc, one end of the rotating rod is provided with second inner slot, the second inner slot is sleeved with hook ring, one side of the rotating rod is provided with limit block, one end of the limit block is provided with third limit gear disc, the third limit gear disc is connected with the second inner slot provided on one side of rotating rod, the limit block is provided with through hole, the two sides of the through hole are provided with fixed block, and the limit block is provided with inner cavity, one side of the inner cavity is provided with spring, one end of the spring is connected with bottom plate, and the bottom plate is fixedly installed on pull rod.
[0007] By adopting the above technical scheme, the problem of poor use effect of the existing up-draw head mould positioning device is solved. By providing an inclined rod on one side of the pull hook, a first limit gear disc is fixedly installed on one side of the inclined rod, a fixed rod is provided on one side of the first limit gear disc, a rotating rod is sleeved on the fixed rod, second limit gear discs are provided on the two sides of the rotating rod, a limit block is further provided on one side of the rotating rod, a third limit gear disc is provided on one side of the limit block, and the second limit gear discs provided on the two sides of the rotating rod are respectively engaged with the first limit gear disc and the third limit gear disc. The angle of the rotating rod is limited, the limit block is sleeved on the fixed rod, the fixed block provided in the limit block is sleeved in the first fixed slot, and the rotation of the first fixed slot is limited, thereby fixing the rotating rod. When the size and model of the pull head change and the angle of the hook ring needs to be adjusted, slide the limit block to the side to release the constraint of the first limit gear disc and the third limit gear disc on the rotating rod, then adjust the angle of the rotating rod, and when the angle is adjusted to the ideal position, slide the limit block to the original position, limit the rotating rod again, avoid the rotating rod from rotating during use, and affect the normal use of the device.
[0008] The utility model further provides that the inside of the pull hook is provided with a first inner slot, the first inner slot vertically and horizontally penetrates the pull hook, and the pull hook cylinder is provided with a connecting end at one end and is sleeved inside the pull hook and fixed by bolts.
[0009] As preferably, by setting the first inner groove in the inside of the pull hook, the first inner groove vertically and transversely penetrates the pull hook, and the pull hook cylinder is provided with a connecting end and is sleeved in the inside of the pull hook, and is fixed by bolts, the pull hook cylinder can be fixedly installed on one side of the pull hook through the first inner groove, so that the pull hook can rotate in the upper pull head mold, and the use effect is achieved.
[0010] The utility model further sets up, the both sides of the inner chamber are provided with through -hole, the through -hole passes through the limiting piece setting, the one end of the pull hook is provided with rotating base, the pull hook is through rotating base and is movably installed in the through groove of the upper pull head mold.
[0011] As preferably, by setting the first inner groove in the inside of the pull hook, the first inner groove vertically and transversely penetrates the pull hook, and the pull hook cylinder is provided with a connecting end and is sleeved in the inside of the pull hook, and is fixed by bolts, the pull hook cylinder can be fixedly installed on one side of the pull hook through the first inner groove, so that the pull hook can rotate in the upper pull head mold, and the use effect is achieved.
[0012] The utility model further sets up, the one end of the fixed block is set as arc convex surface, the one side of the first fixed groove is set as arc concave surface, and the radius of arc surface and the diameter of arc concave surface are same.
[0013] As preferably, by setting the first inner groove in the inside of the pull hook, the first inner groove vertically and transversely penetrates the pull hook, and the pull hook cylinder is provided with a connecting end and is sleeved in the inside of the pull hook, and is fixed by bolts, the pull hook cylinder can be fixedly installed on one side of the pull hook through the first inner groove, so that the pull hook can rotate in the upper pull head mold, and the use effect is achieved.
[0014] The utility model further sets up, the diameter of the pull rod and the diameter of the through -hole are same, and the one end of the pull rod is provided with round boss.
[0015] As preferably, by setting the first inner groove in the inside of the pull hook, the first inner groove vertically and transversely penetrates the pull hook, and the pull hook cylinder is provided with a connecting end and is sleeved in the inside of the pull hook, and is fixed by bolts, the pull hook cylinder can be fixedly installed on one side of the pull hook through the first inner groove, so that the pull hook can rotate in the upper pull head mold, and the use effect is achieved.
[0016] The utility model further sets up, the diameter of the through -hole of the limiting piece and the diameter of the fixed rod are same, and the through -hole of the limiting piece is passed through and is provided with third limit gear disc.
[0017] As preferably, by setting the first inner groove in the inside of the pull hook, the first inner groove vertically and transversely penetrates the pull hook, and the pull hook cylinder is provided with a connecting end and is sleeved in the inside of the pull hook, and is fixed by bolts, the pull hook cylinder can be fixedly installed on one side of the pull hook through the first inner groove, so that the pull hook can rotate in the upper pull head mold, and the use effect is achieved.
[0018] The utility model further sets up, first limit gear disc, second limit gear disc and third limit gear disc's diameter is same, and first limit gear disc, second limit gear disc and third limit gear disc's one side all are provided with a plurality of groups of protruding pieces, and the protruding piece between first limit gear disc, second limit gear disc and third limit gear disc is mutually clamped.
[0019] As preferred, by setting the first limit gear disc, the second limit gear disc and the third limit gear disc with the same diameter, and setting a plurality of protruding pieces on one side of the first limit gear disc, the second limit gear disc and the third limit gear disc, and mutually clamping the protruding pieces between the first limit gear disc, the second limit gear disc and the third limit gear disc, a limiting effect can be achieved on the rotating rod on which the second limit gear disc is fixedly installed, avoiding the rotating rod from rotating during use.
[0020] The utility model further sets up, the side of hook ring is provided with second fixed groove, and one end of hook ring is provided with curved hook.
[0021] As preferred, by setting the second fixed groove on one side of the hook ring, the installation of the hook ring is facilitated, and the curved hook is provided on one end of the hook ring, so that the hook ring can better contact the pull ring.
[0022] The utility model further sets up, one end of pull rod is sleeved in fixed hole, and fixed block is sleeved in first fixed groove.
[0023] As preferred, by sleeving one end of the pull rod in the fixed hole, a limiting effect can be achieved on the sliding of the limiting block, and the fixed block is sleeved in the first fixed groove, so that the limiting block cannot rotate, and the third limit gear disc on one side of the limiting block can achieve the fixing effect on the rotating rod.
[0024] In summary, the utility model mainly has the following beneficial effects:
[0025] 1. The utility model discloses a fixed rod, first fixed slot, fixed hole, first limit gear plate, pull hook cylinder, fixed base, rotary lever, second inner groove, second limit gear plate, hook ring, second fixed slot, limit block, fixed block spring, three limit gear plates, inner chamber and pull rod are seted up, solve the problem that the use effect of the existing pull head mould positioning device is not good, the side of pull hook is provided with the inclined pole, the side fixed mounting of inclined pole has first limit gear plate, the side of first limit gear plate is provided with fixed rod, and the rotary lever is seted up on the fixed rod, and the second limit gear plate is seted up on the both sides of rotary lever, and the side of rotary lever still is provided with limit block, the side of limit block is provided with third limit gear plate, and the second limit gear plate seted up on the both sides of rotary lever is respectively with first limit gear plate and third limit gear plate and is engaged, and the angle of rotary lever plays a limit effect, and the limit block is seted up on the fixed rod, and the fixed block seted up in limit block is seted up in first fixed slot, and the rotation of first fixed slot plays a limit, and thus plays a fixed effect to rotary lever, when the size and model of pull head change, need to adjust the angle of hook ring, slide limit block to the side and remove the constraint of first limit gear plate and third limit gear plate to rotary lever, then adjust the angle of rotary lever, and after angle adjustment reaches the ideal position, the original position of limit block is slid, and the rotary lever is limited again, avoids the rotary lever from rotating in the use process, and thus influences the normal use of device.
[0026] 2. The utility model discloses a limit block is seted up, and the inner chamber is seted up in the limit block, and the spring is seted up in the inner chamber, and one end of spring contacts bottom plate, and the pull rod is seted up on bottom plate, when not needing to adjust the angle of rotary lever, one end of pull rod will be seted up in the fixed hole seted up on the side of fixed rod, thereby can play a limit effect to the movement of limit block, avoids the looseness of limit block in the use process of device, thereby influences the fixed effect of rotary lever, and the round block is still seted up on the side of pull rod, and the stretching of pull rod is convenient, and the device is more practical. ACCURACY OF DRAWINGS
[0027] Figure 1 It is the first structure schematic drawing of the utility model;
[0028] Figure 2 It is the first local enlarged view of the utility model;
[0029] Figure 3 It is the pull hook detail view of the utility model;
[0030] Figure 4 It is the second local enlarged view of the utility model;
[0031] Figure 5 It is the second structure schematic drawing of the utility model;
[0032] Figure 6The limiting block detail view of the utility model;
[0033] Figure 7 The first block sectional view of the utility model;
[0034] Figure 8 The second sectional view of the utility model.
[0035] Mark explanation:
[0036] 1, the upper pull head mold, 11, the mold base, 2, the pull hook, 21, the rotating base, 22, the first inner groove, 23, the inclined rod, 24, the fixed rod, 25, the first fixed groove, 26, the fixed hole, 27, the first limiting gear disc, 3, the pull hook cylinder, 4, the fixed base, 5, the rotating rod, 51, the second inner groove, 52, the second limiting gear disc, 6, the hook ring, 61, the second fixed groove, 7, the limiting block, 71, the fixed block, 72, the spring, 8, the third limiting gear disc, 9, the inner cavity, 10, the pull rod, 101, the bottom plate. Specific implementation
[0037] The technical scheme in the embodiments of the utility model will be described clearly and completely below in conjunction with the drawings in the embodiments of the utility model. The embodiments described below with reference to the drawings are exemplary and are only used to explain the utility model and cannot be understood as limiting the utility model.
[0038] The embodiments of the utility model will be described below according to the overall structure of the utility model.
[0039] Please refer to Figures 1-8 , including upper pull head mold 1, the top of upper pull head mold 1 is provided with mold base 11, one side of mold base 11 is provided with fixed base 4, one side of fixed base 4 is fixedly installed with pull hook cylinder 3, through groove is set up in upper pull head mold 1, pull hook 2 is set up in through groove, one end of pull hook 2 is provided with rotating base 21, the other end of pull hook 2 is provided with inclined rod 23, one side of inclined rod 23 is provided with first limiting gear disc 27, one side of first limiting gear disc 27 is fixedly installed with fixed rod 24, one end of fixed rod 24 is provided with first fixed groove 25, fixed rod 24 is provided with fixed hole 26 on one side, rotating rod 5 is sleeved on fixed rod 24, second limiting gear disc 52 is set up on both sides of rotating rod 5, second inner groove 51 is set up on one end of rotating rod 5, hook ring 6 is sleeved in second inner groove 51, one side of rotating rod 5 is provided with limiting block 7, one end of limiting block 7 is provided with third limiting gear disc 8, third limiting gear disc 8 is connected with second inner groove 51 set up on one side of rotating rod 5, through hole is set up in limiting block 7, fixed block 71 is set up on both sides of through hole, and inner cavity 9 is set up in limiting block 7, spring 72 is installed on one side of inner cavity 9, one end of spring 72 is connected with bottom plate 101, bottom plate 101 is fixedly installed on pull rod 10.
[0040] In the above embodiment, please refer to the specific Figure 1 and Figure 3 , the first inner groove 22 is vertically and transversely through the pull hook 2, and the pull hook cylinder 3 is provided with a connecting end and is sleeved in the pull hook 2, and is fixed by bolts. By setting the first inner groove 22, the pull hook cylinder 3 can be fixedly installed on one side of the pull hook 2, so that the pull hook 2 can rotate in the upper pull head mold 1, and the use effect is achieved.
[0041] In the above embodiment, please refer to the specific Figure 7 , the two sides of the inner cavity 9 are provided with through holes, the through holes pass through the limiting block 7, one end of the pull hook 2 is provided with a rotating base 21, and the pull hook 2 is movably installed in the through groove of the upper pull head mold 1 through the rotating base 21. By setting the through holes on the two sides of the inner cavity 9, the through holes pass through the limiting block 7, the pull rod 10 is convenient to install, one end of the pull hook 2 is provided with a rotating base 21, and the pull hook 2 is movably installed in the through groove of the upper pull head mold 1 through the rotating base 21, so that the pull hook 2 can be arc-shaped in the through groove. Rotating, so that the hook ring 6 achieves the use effect.
[0042] In the above embodiment, please refer to the specific Figure 2 and Figure 6 , one end of the fixed block 71 is provided as a circular arc convex surface, one side of the first fixed groove 25 is provided as a circular arc concave surface, and the radius of the circular arc surface is the same as the diameter of the circular arc concave surface. By setting one end of the fixed block 71 as a circular arc convex surface, one side of the first fixed groove 25 is provided as a circular arc concave surface, and the radius of the circular arc surface is the same as the diameter of the circular arc concave surface, so that the fixed block 71 can be sleeved in the first fixed groove 25, thereby achieving the limiting effect of the limiting block 7.
[0043] In the above embodiment, please refer to the specific Figure 7 , the diameter of the pull rod 10 is the same as the diameter of the through hole, and one end of the pull rod 10 is provided with a circular protrusion. By setting the diameter of the pull rod 10 to be the same as the diameter of the through hole, the pull rod 10 can be easily sleeved in the inner cavity 9, avoiding collision between the pull rod 10 and the limiting block 7. One end of the pull rod 10 is provided with a circular protrusion, which is convenient for personnel to hold the pull rod 10, and the device is more practical.
[0044] In the above embodiment, please refer to the specific Figure 2 and Figure 6The diameter of the through hole formed in the limiting block 7 is the same as the diameter of the fixed rod 24, and the through hole formed in the limiting block 7 penetrates the third limiting gear disc 8, by setting the diameter of the through hole formed in the limiting block 7 to be the same as the diameter of the fixed rod 24, and setting the through hole formed in the limiting block 7 to penetrate the third limiting gear disc 8, the limiting block 7 is sleeved, avoiding the collision between the fixed rod 24 and the third limiting gear disc 8, thereby affecting the normal use of the device.
[0045] In the above embodiment, please refer to Figure 2 and Figure 4 , the diameters of the first limiting gear disc 27, the second limiting gear disc 52 and the third limiting gear disc 8 are the same, and a plurality of protrusions are arranged on one side of the first limiting gear disc 27, the second limiting gear disc 52 and the third limiting gear disc 8, and the protrusions between the first limiting gear disc 27, the second limiting gear disc 52 and the third limiting gear disc 8 are clamped with each other, by setting the diameters of the first limiting gear disc 27, the second limiting gear disc 52 and the third limiting gear disc 8 to be the same, and arranging a plurality of protrusions on one side of the first limiting gear disc 27, the second limiting gear disc 52 and the third limiting gear disc 8, and clamping the protrusions between the first limiting gear disc 27, the second limiting gear disc 52 and the third limiting gear disc 8 with each other, the rotating rod 5 on which the second limiting gear disc 52 is fixed can be limited, avoiding the rotating rod 5 from rotating during use
[0046] In the above embodiment, please refer to Figure 6 , a second fixing groove 61 is formed on one side of the hook ring 6, and a curved hook is arranged at one end of the hook ring 6, by forming the second fixing groove 61 on one side of the hook ring 6, the installation of the hook ring 6 is facilitated, and the curved hook arranged at one end of the hook ring 6 enables the hook ring 6 to better contact the pull ring.
[0047] In the above embodiment, please refer to Figure 2 and Figure 8 , one end of the pull rod 10 is sleeved in the fixed hole 26, and the fixed block 71 is sleeved in the first fixing groove 25, by sleeving one end of the pull rod 10 in the fixed hole 26, the sliding of the limiting block 7 can be limited, and by sleeving the fixed block 71 in the first fixing groove 25, the limiting block 7 cannot rotate, so that the third limiting gear disc 8 on one side of the limiting block 7 can fix the rotating rod 5.
[0048] The utility model discloses a specific work time: when the model and size of the puller that processes change, because the position that the original hook ring 6 and the pull ring contact will change, the device needs to take out pull rod 10 that is clamped in fixed hole 26 through extruding spring 72 before use, and the limit block 7 is along fixed rod 24 and slides to one end, makes first limit gear plate 27 and third limit gear plate 8 and the second limit gear plate 52 of both sides of rotating rod 5 not contact, thereby release the limit of rotating rod 5, and the end of pull rod 10 is provided with round block, and the holding of pull rod 10 is convenient, and it is more convenient to use, then according to the model and size adjustment rotating rod 5's angle of puller, when the angle adjustment can reach the ideal positioning effect, then again push limit block 7 to the original place, and first limit gear plate 27 and third limit gear plate 8 and the second limit gear plate 52 of both sides of rotating rod 5 are re-engaged, and the rotation of rotating rod 5 is limited, because limit block 7 is internally provided with fixed block 71, and fixed block 71 is sleeved in first fixed slot 25, can strengthen the fixation of limit block 7 and fixed block 71 to rotating rod 5, avoid rotating rod 5 to rotate, and spring 72 resets when limit block 7 moves to the original position, and one end of pull rod 10 is re-sleeved in fixed hole 26, avoid limit block 7 to slide, thereby influence rotating rod 5 angle's fixed, then through pull hook cylinder 3 and drive one end through rotating base 21 swing installation in the pull hook 2 of upper puller mould 1 rotation, thereby make the hook ring 6 that pull hook 2 one side sets up can hook the pull ring, prevent the puller to jump, and can pull open the safety, make the zipper can enter the puller, reach the use effect.
[0049] Although the embodiments of the utility model have been shown and described, the specific embodiments are only the explanation of the utility model, and are not the limitation of the utility model, and the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable way, and the person skilled in the art can make the modification, replacement and change of the embodiment without creative contribution after reading the specification without departing from the principles and the tenet of the utility model, but as long as in the patent right claim range of the utility model, it is protected by the patent law.
Claims
1. A puller head mold positioning device comprising a puller head mold (1), characterized in that: The top of the upper pull head mold (1) is provided with a mold base (11), one side of the mold base (11) is provided with a fixed base (4), one side of the fixed base (4) is fixedly installed with a pull hook air cylinder (3), a through groove is formed in the upper pull head mold (1), the pull hook (2) is arranged in the through groove, one end of the pull hook (2) is provided with a rotating base (21), the other end of the pull hook (2) is provided with an inclined rod (23), one side of the inclined rod (23) is provided with a first limiting gear plate (27), one side of the first limiting gear plate (27) is fixedly installed with a fixed rod (24), one end of the fixed rod (24) is provided with a first fixed groove (25), one side of the fixed rod (24) is provided with a fixed hole (26), the rotating rod (5) is sleeved on the fixed rod (24), the second limiting gear plate (52) is arranged on both sides of the rotating rod (5), one end of the rotating rod (5) is provided with a second inner groove (51), the hook ring (6) is sleeved in the second inner groove (51), one side of the rotating rod (5) is provided with a limiting block (7), one end of the limiting block (7) is provided with a third limiting gear plate (8), the third limiting gear plate (8) is connected with the second inner groove (51) arranged on one side of the rotating rod (5), the limiting block (7) is provided with a through hole, the fixed block (71) is arranged on both sides of the through hole, and the inner cavity (9) is arranged in the limiting block (7), one side of the inner cavity (9) is installed with a spring (72), one end of the spring (72) is connected with a bottom plate (101), and the bottom plate (101) is fixedly installed on the pull rod (10).
2. A puller head mold positioning device as defined in claim 1, wherein: The first inner groove (22) is formed in the pull hook (2), the first inner groove (22) vertically and transversely penetrates the pull hook (2), one end of the pull hook air cylinder (3) is provided with a connecting end, and the pull hook air cylinder (3) is sleeved in the pull hook (2) and fixed by bolts.
3. A puller head mold positioning device as defined in claim 1, wherein: The through hole is arranged on both sides of the inner cavity (9), the through hole penetrates the limiting block (7), one end of the pull hook (2) is provided with the rotating base (21), and the pull hook (2) is movably installed in the through groove formed in the upper pull head mold (1) through the rotating base (21).
4. A puller head mold positioning device as defined in claim 1 wherein: One end of the fixed block (71) is provided as a circular convex surface, one side of the first fixed groove (25) is provided as a circular concave surface, and the radius of the circular convex surface is the same as the diameter of the circular concave surface.
5. A puller head mold positioning device as defined in claim 3 wherein: The diameter of the pull rod (10) is the same as the diameter of the through hole, and one end of the pull rod (10) is provided with a circular convex block.
6. A puller head mold positioning device as defined in claim 1 wherein: The diameter of the through hole formed in the limiting block (7) is the same as the diameter of the fixed rod (24), and the through hole formed in the limiting block (7) penetrates the third limiting gear plate (8).
7. A pull head mold positioning device as defined in claim 1, wherein: The diameters of the first limiting gear plate (27), the second limiting gear plate (52) and the third limiting gear plate (8) are the same, a plurality of convex blocks are arranged on one side of the first limiting gear plate (27), the second limiting gear plate (52) and the third limiting gear plate (8), and the convex blocks between the first limiting gear plate (27), the second limiting gear plate (52) and the third limiting gear plate (8) are clamped with each other.
8. A pull head mold positioning device as defined in claim 1, wherein: One side of the hook ring (6) is provided with a second fixing groove (61), and one end of the hook ring (6) is provided with a curved hook.
9. A pull head mold positioning device as defined in claim 1, wherein: One end of the pull rod (10) is sleeved in the fixing hole (26), and the fixing block (71) is sleeved in the first fixing groove (25).