Hinge structure applied to folding mouse

Abstract

The utility model discloses a hinge structure applied to a folding mouse, which belongs to the technical field of electronic products and comprises a front hinge, a rear hinge, a middle hinge block, a rotating shaft and a cam action group. The middle hinge block is arranged between the front hinge and the rear hinge, and the two rotating shafts are movably arranged on the two sides of the middle hinge block in a penetrating mode respectively. Two ends of one rotating shaft are respectively connected with two ends of the front hinge, and two ends of the other rotating shaft are respectively connected with two ends of the rear hinge; one cam action group is arranged on the adjacent side of each of the two ends of each rotating shaft in a penetrating mode, the two cam action groups are connected with the front hinge and the middle hinge block respectively, and the other two cam action groups are connected with the rear hinge and the middle hinge block respectively. The hinge structure applied to the folding mouse solves the technical problem of how to improve the foldable storage performance of the folding mouse.

Description

Technical Field

[0001] This utility model relates to the technical field of electronic products, and in particular to a hinge structure for use in folding mice. Background Technology

[0002] A foldable mouse is a peripheral product that combines portability with innovative design. Its core feature is its foldable structure, and it is typically suitable for mobile office, business travel and other scenarios.

[0003] Specifically, the overall structure of a foldable mouse revolves around three core elements: the folding mechanism, lightweight materials, and precision component layout. It balances portability and functionality through designs such as hinges, magnets, and telescopic extension. Generally, the technical challenge of foldable mice lies in ensuring structural stability when folded and operational comfort when unfolded, which requires a combination of high-precision mechanical engineering and ergonomic design.

[0004] Based on this, Chinese patent CN213210985U discloses a folding mouse, which includes a main control board, a button section, a bending component, a first outer shell, and a second outer shell. The main control board is disposed inside the first outer shell, and the button section is disposed on the upper side of the first outer shell and abuts against a micro switch of the main control board through its button contacts. The bending component includes a first fixing member and a second fixing member, which are hinged together. The first outer shell is fixedly connected to the first fixing member, and the second outer shell is fixedly connected to the second fixing member. This allows the bending component inside the mouse to rotate by rotating the first and second outer shells, realizing the switching between an ergonomically folding enabled state and a closed state suitable for portable storage. Therefore, it has the advantages of being easy to carry and having a good grip.

[0005] However, existing folding mice still suffer from the technical problem of not being able to fold completely for storage. Specifically, traditional mice are generally inseparable as a whole, though some are partially foldable; for example, existing patents disclose folding mice that primarily use a single hinge design, allowing the tail of the mouse to fold for storage, but the main body cannot be completely folded. For a mouse to fold completely, a hinge is necessary with two main functions: first, it must connect the front and rear parts of the mouse with sufficient strength to ensure stability and prevent deformation during normal or slightly forceful one-handed operation; second, it must be able to achieve complete folding and storage through dual hinges. Utility Model Content

[0006] Therefore, it is necessary to provide a hinge structure for foldable mice to address the technical issue of how to improve the foldable storage performance of foldable mice.

[0007] A hinge structure for a folding mouse includes: a front hinge, a rear hinge, a middle hinge block, a pivot, and a cam actuation group; the middle hinge block is disposed between the front hinge and the rear hinge, and two pivots are respectively movably disposed on both sides of the middle hinge block; the two ends of one pivot are respectively connected to the two ends of the front hinge, and the two ends of the other pivot are respectively connected to the two ends of the rear hinge; a cam actuation group is disposed adjacent to each end of each of the two ends of each pivot, wherein two cam actuation groups are respectively connected to the front hinge and the middle hinge block, and the other two cam actuation groups are respectively connected to the rear hinge and the middle hinge block.

[0008] Furthermore, each of the aforementioned cam actuation units is provided with a spring, a cam cylinder, and a toothed sleeve.

[0009] Furthermore, the spring passes through the rotating shaft, with one end of the spring abutting against the side of the front hinge and the other end of the spring abutting against the side of the cam cylinder; the cam cylinder is sleeved in the rotating shaft, with the side of the cam cylinder movably connected to the side of the toothed sleeve, and the side of the toothed sleeve connected to the side of the intermediate hinge block.

[0010] Furthermore, the pivot is a flat pivot; the front hinge has a front hinge body and two front inner flat sleeves; a front inner flat sleeve is respectively provided at both ends of the side of the front hinge body, and one end of the pivot is inserted through each front inner flat sleeve.

[0011] Furthermore, the rear hinge has a rear hinge body and two rear inner flat sleeves; a rear inner flat sleeve is respectively provided at both ends of the side of the rear hinge body, and one end of the rotating shaft is inserted through each rear inner flat sleeve.

[0012] Furthermore, the cam cylinder has a cam cylinder body, a flat cavity inside the cam, and an alternating high and low convex and concave edge structure.

[0013] Furthermore, a flat cavity is provided within the cam cylinder, and the flat cavity within the cam is matched with the outer contour of the rotating shaft.

[0014] Furthermore, the alternating high and low convex and concave edge structure is disposed on one side of the cam cylinder, and the other side of the cam cylinder is abutted and connected to the spring; the alternating high and low convex and concave edge structure is engaged with the toothed sleeve.

[0015] Furthermore, the front hinge is provided with a plurality of front stop blocks, which are evenly distributed between the two front inner flat sleeves; the rear hinge is provided with a plurality of rear stop blocks, which are evenly distributed between the two rear inner flat sleeves.

[0016] Furthermore, the intermediate hinge block is provided with an intermediate block, a hinge cylinder, and multi-stage stop grooves; each side of the intermediate block is provided with a hinge cylinder, and a rotating shaft is movably inserted through each hinge cylinder; the outer surface of each hinge cylinder is provided with a plurality of multi-stage stop grooves; each multi-stage stop groove is provided with a plurality of stop slots, each front stop block is movably connected to a multi-stage stop groove, and each rear stop block is movably connected to a multi-stage stop groove.

[0017] In summary, the hinge structure of this utility model for a folding mouse includes a front hinge, a rear hinge, a middle hinge block, a pivot, and a cam actuation group. The middle hinge block is positioned between the front and rear hinges, and two pivots are movably inserted through both sides of the middle hinge block. One pivot's two ends are connected to both ends of the front hinge, and the other pivot's two ends are connected to both ends of the rear hinge. A cam actuation group is inserted adjacent to each end of each pivot. Two cam actuation groups connect the front hinge and the middle hinge block, and two other cam actuation groups connect the rear hinge and the middle hinge block. This hinge structure for a folding mouse can achieve complete folding and storage through a dual-axis rotational folding structure. Furthermore, in this technical solution, the first and second mouse bodies can be folded and stored sequentially or simultaneously, further reducing the space required for mouse storage after folding. Therefore, the hinge structure of this utility model applied to a folding mouse solves the technical problem of how to improve the foldable storage performance of a folding mouse. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of a hinge structure for a folding mouse according to the present invention;

[0019] Figure 2 This is a schematic diagram of the hinge structure of this utility model applied to a folding mouse in its usage state;

[0020] Figure 3 This is a schematic diagram of another usage state of the hinge structure of this utility model applied to a folding mouse;

[0021] Figure 4 This is a schematic diagram of the hinge structure of this utility model applied to a folding mouse from another direction;

[0022] Figure 5 This is an exploded view of the hinge structure of a folding mouse according to the present invention.

[0023] Figure 6 This is another exploded structural diagram of a hinge structure for a folding mouse according to the present invention. Detailed Implementation

[0024] To make the above-mentioned objects, features, and advantages of this utility model more apparent and understandable, the specific embodiments of this utility model will be described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a full understanding of this utility model. However, this utility model can be implemented in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of this utility model. Therefore, this utility model is not limited to the specific embodiments disclosed below.

[0025] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0026] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this utility model, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0027] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0028] In this utility model, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0029] It should be noted that when an element is referred to as being "fixed to" or "set on" another element, it can be directly on the other element or there may be an intervening element. When an element is considered to be "connected to" another element, it can be directly connected to the other element or there may be an intervening element. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only possible implementation.

[0030] Please see Figure 1 This utility model discloses a hinge structure for a folding mouse, comprising: a front hinge 1, a rear hinge 2, a middle hinge block 3, a pivot 4, and a cam action group 5. The middle hinge block 3 is disposed between the front hinge 1 and the rear hinge 2, and two pivots 4 are respectively movably inserted through both sides of the middle hinge block 3. The two ends of one pivot 4 are respectively connected to the two ends of the front hinge 1, and the two ends of the other pivot 4 are respectively connected to the two ends of the rear hinge 2. A cam action group 5 is inserted through each adjacent side of each end of each pivot 4, wherein two cam action groups 5 are respectively connected to the front hinge 1 and the middle hinge block 3, and the other two cam action groups 5 are respectively connected to the rear hinge 1 and the middle hinge block 3.

[0031] For details, please continue reading. Figures 2 to 3This utility model discloses a hinge structure for a folding mouse, which enables the mouse to be fully folded. The traditional mouse body can be divided into three sections: a first mouse body 11, a second mouse body 22, and a middle hinge block 3. The first mouse body 11 is connected to the front hinge 1, and the second mouse body 22 is connected to the rear hinge 2. The first mouse body 11 and the second mouse body 22 are connected by the middle hinge block 3. Therefore, the first mouse body 11 can be folded and stored along one of the pivots 4 on the side of the intermediate hinge block 3, while the second mouse body 22 can be folded and stored along the other pivot 4 on the side of the intermediate hinge block 3. When the two mouse bodies are folded and stored, they can abut and fit together. It can be seen that, compared with the existing rear-folding mouse solutions, the hinge structure of this utility model for folding mice can achieve complete folding and storage through a dual-axis rotational folding structure. Moreover, in the technical solution of the hinge structure of this utility model for folding mice, the first mouse body 11 and the second mouse body 22 can be folded and stored separately or simultaneously. After folding, the storage space required for the mouse can be further reduced. Therefore, it can be said that the hinge structure of this utility model for folding mice solves the technical problem of how to improve the foldable storage performance of folding mice.

[0032] For further information, please refer to [link / reference]. Figures 4 to 6 In one specific embodiment, each of the cam action groups 5 is provided with a spring 501, a cam cylinder 502, and a toothed sleeve 503; the spring 501 passes through the rotating shaft 4, one end of the spring 501 abuts against the side of the front hinge 1, and the other end of the spring 501 abuts against the side of the cam cylinder 502; the cam cylinder 502 is sleeved in the rotating shaft 4, and the side of the cam cylinder 502 is movably connected to the side of the toothed sleeve 503, and the side of the toothed sleeve 503 is connected to the side of the intermediate hinge block 3.

[0033] Specifically, the pivot 4 is a flat pivot; the front hinge 1 has a front hinge body 101 and two front inner flat sleeves 102; a front inner flat sleeve 102 is respectively provided at both ends of the side of the front hinge body 101, and one end of the pivot 4 is passed through each front inner flat sleeve 102.

[0034] Similarly, the rear hinge 2 has a rear hinge body 201 and two rear inner flat sleeves 202; a rear inner flat sleeve 202 is respectively provided at both ends of the side of the rear hinge body 201, and one end of the rotating shaft 4 is passed through each rear inner flat sleeve 202.

[0035] Therefore, when the user moves the first mouse body 11 or the second mouse body 22, thereby driving the front hinge body 101 or the rear hinge body 201, the front hinge body 101 or the rear hinge body 201 can correspondingly drive the front inner flat sleeve 102 or the rear inner flat sleeve 202, so that the corresponding rotating shaft 4 rotates accordingly. This is because the outer contour of the rotating shaft 4 is a flat structure, and the inner cavity of the front inner flat sleeve 102 or the rear inner flat sleeve 202 corresponds to a flat structure that matches the outer shell of the rotating shaft 4, thus enabling the front hinge body 101 or the rear hinge body 201 to be linked with the corresponding rotating shaft 4 respectively.

[0036] Furthermore, the cam cylinder 502 has a cam cylinder body 502a, a flat cavity inside the cam 502b, and an alternating high and low convex and concave edge structure 502c; the flat cavity inside the cam 502b is disposed in the cam cylinder body 502a, and the flat cavity inside the cam 502b is matched with the outer contour of the rotating shaft 4; the alternating high and low convex and concave edge structure 502c is disposed on one side of the cam cylinder body 502a, and the other side of the cam cylinder body 502a is in contact with the spring 501; the alternating high and low convex and concave edge structure 502c is engaged with the toothed sleeve 503.

[0037] Specifically, the toothed sleeve 503 has a toothed structure on its side and a circular structure in its inner cavity. Thus, when the rotating shaft 4 rotates, it can drive the cam cylinder 502 to rotate along with the rotating shaft 4. Furthermore, when the cam cylinder 502a rotates, the alternating high and low convex and concave edge structure 502c provided on its side can sequentially match and mesh with the toothed structure of the toothed sleeve 503.

[0038] Therefore, when the user manually moves the first mouse body 11 or the second mouse body 22, thereby rotating the rotating shaft 4, the rotating shaft 4 drives the cam cylinder 502 to rotate. When the cam cylinder 502 rotates, the alternating high and low convex and concave edge structure 502c provided on its side alternately engages with the side of the toothed sleeve 503. When it rotates to a preset angle, it pushes the spring 501 to compress or extend and reset. Thus, at a preset angle, the cam cylinder 502 can be fixedly engaged with the toothed sleeve 503 under the elastic force of the spring 501. This allows the front hinge 1 to form a preset angle of 85° or 131.5° with the middle hinge block 3. Similarly, the rear hinge 2 can also form a preset angle of 85° or 131.5° with the middle hinge block 3. Alternatively, the front hinge 1 can be pre-set to form a 155° angle with the middle hinge block 3, while the rear hinge 2 can form a 157° angle with the middle hinge block 3.

[0039] Furthermore, the front hinge 1 is also provided with a plurality of front stop blocks 103, which are evenly distributed between the two front inner flat sleeves 102.

[0040] Furthermore, the rear hinge 2 is also provided with a plurality of rear stop blocks 203, which are evenly distributed between the two rear inner flat sleeves 202.

[0041] The intermediate hinge block 3 is provided with an intermediate block 301, a hinge cylinder 302, and a multi-stage stop groove 303; each side of the intermediate block 301 is provided with a hinge cylinder 302, and a rotating shaft 4 is movably inserted through each hinge cylinder 302; a plurality of multi-stage stop grooves 303 are provided on the outer surface of each hinge cylinder 302; a plurality of stop grooves 303 are provided in each multi-stage stop groove 303, each front stop block 103 is movably connected to a multi-stage stop groove 303, and each rear stop block 203 is movably connected to a multi-stage stop groove 303.

[0042] Specifically, in some other embodiments, the hinge structure of this utility model applied to a folding mouse is provided with two or more opening angles. For example, in one opening angle, the front hinge body 101 and the middle hinge block 3 form an opening angle of 131.5 degrees. At this time, the alternating high and low concave and convex edge structure 502c provided on the side of the cam cylinder 502 can be engaged with the toothed sleeve 503. Subsequently, the front stop block 103 provided on the side edge of the front hinge body 101 can be made to abut against the engagement position of each of the stop grooves 303a in the multi-level stop grooves 303, thereby fixing the opening angle formed between the front hinge body 101 and the middle hinge block 3, such as 131.5 degrees, 155 degrees, etc. The rear hinge body 201 can also adopt a similar design to form an opening angle of 131.5 degrees or 157 degrees with the middle hinge block 3, respectively.

[0043] Therefore, when the mouse is in the open state and subjected to unexpected pressure, such as being stepped on while on the ground, the alternating convex and concave edge structure 502c provided on the side of the cam cylinder 502 will slide backward and compress the spring 501 through the inclined surface of the toothed sleeve 503. At this time, the first-stage stop function disappears, and the second stage of the hinge unfolds, making it flat with the intermediate hinge block 3 as a whole, thereby preventing damage to the hinge. After the flattening pressure is removed, each hinge can be manually returned to its initial position.

[0044] In summary, the hinge structure of this utility model for a folding mouse includes a front hinge 1, a rear hinge 2, a middle hinge block 3, a pivot 4, and a cam action group 5. The middle hinge block 3 is disposed between the front hinge 1 and the rear hinge 2, and two pivots 4 are respectively movably inserted through both sides of the middle hinge block 3. The two ends of one pivot 4 are respectively connected to the two ends of the front hinge 1, and the two ends of the other pivot 4 are respectively connected to the two ends of the rear hinge 2. A cam action group 5 is inserted through each adjacent side of each end of each pivot 4. Two cam action groups 5 are respectively connected to the front hinge 1 and the middle hinge block 3, and the other two cam action groups 5 are respectively connected to the rear hinge 1 and the middle hinge block 3. This invention discloses a hinge structure for a foldable mouse that achieves complete folding and storage through a dual-axis rotational folding mechanism. Furthermore, in this technical solution, the first mouse body 11 and the second mouse body 22 can be folded and stored sequentially or simultaneously; after folding, the space required for mouse storage can be further reduced. Therefore, this invention solves the technical problem of how to improve the foldable storage performance of a foldable mouse.

[0045] More specifically, in the technical solution proposed in this utility model for a hinge structure applied to a folding mouse, complex functions are achieved through a simple structure. This hinge structure uses a conventional cam assembly plus a linear spring, with the hinge driving a flat shaft; the flat shaft then drives the cam to achieve movement and positioning. Furthermore, in this technical solution, the engagement depth of the front cam is shallower than that of the rear cam; therefore, the rotational force is not the same, allowing the front of the mouse to open first, followed by the rear. Further, the middle part of the hinge structure and the cam assembly proposed in this utility model can be formed by powder metallurgy, and the thickness of the middle connecting block is greater than 1.0 mm. The front and rear hinges can be stamped from 1.0 mm thick SUS420 stainless steel sheet, resulting in excellent structural strength. Overall, the hinge structure proposed in this utility model has four sets of cams. The two sets on the right are responsible for the rotation angle, satisfying the tactile force and angle for opening; while the two sets of cams on the left are responsible for angle limiting and overload protection. The hinge proposed in this invention allows users to experience enjoyment during work, unfolding and folding like a toy with crisp movements and the satisfying click of gears meshing when fully engaged. It is also easy to carry, taking up minimal space when folded. Currently, folding mice on the market are single-axis, only folding up the tail section and not achieving true folding functionality.

[0046] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0047] The embodiments described above are merely illustrative of several implementations of this utility model, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the utility model patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this utility model, and these all fall within the protection scope of this utility model. Therefore, the protection scope of this utility model patent should be determined by the appended claims.

Claims

1. A hinge structure applied to a folding mouse, characterized in that, It includes: front Hinge (1), rear hinge (2), intermediate hinge block (3), shaft (4) and cam action group (5); the intermediate hinge block (3) is arranged between the front hinge (1) and the rear hinge (2), and the two shafts (4) are movably arranged on the two sides of the intermediate hinge block (3) respectively; the two ends of one of the shafts (4) are connected with the two ends of the front hinge (1) respectively, and the two ends of the other shaft (4) are connected with the two ends of the rear hinge (2) respectively; each end of the two ends of each shaft (4) is provided with a cam action group (5), wherein the two cam action groups (5) are connected with the front hinge (1) and the intermediate hinge block (3) respectively, and the other two cam action groups (5) are connected with the rear hinge (2) and the intermediate hinge block (3) respectively.

2. The hinge structure applied to the folding mouse according to claim 1, characterized in that: Each cam action group (5) is provided with a spring (501), a cam rotating cylinder (502) and a toothed sleeve connector (503).

3. The hinge structure for a foldable mouse according to claim 2, wherein: The spring (501) is arranged in the shaft (4), one end of the spring (501) abuts against the side surface of the front hinge (1), and the other end of the spring (501) abuts against the side surface of the cam rotating cylinder (502); the cam rotating cylinder (502) is sleeved in the shaft (4), the side surface of the cam rotating cylinder (502) is movably connected with the side surface of the toothed sleeve connector (503), and the side surface of the toothed sleeve connector (503) is connected with the side surface of the intermediate hinge block (3).

4. The hinge structure for a foldable mouse according to claim 3, wherein: The shaft (4) is a flat shaft; the front hinge (1) has a front hinge body (101) and two front inner flat sleeve connecting barrels (102); the side surfaces of the two ends of the front hinge body (101) are respectively provided with a front inner flat sleeve connecting barrel (102), and one end of the shaft (4) is arranged in each front inner flat sleeve connecting barrel (102).

5. The hinge structure for a foldable mouse according to claim 4, wherein: The rear hinge (2) has a rear hinge body (201) and two rear inner flat sleeve connecting barrels (202); the side surfaces of the two ends of the rear hinge body (201) are respectively provided with a rear inner flat sleeve connecting barrel (202), and one end of the shaft (4) is arranged in each rear inner flat sleeve connecting barrel (202).

6. The hinge structure for a foldable mouse according to claim 5, wherein: The cam rotating cylinder (502) has a cam cylinder body (502a), a cam inner flat cavity (502b) and a high-low alternating convex-concave edge structure (502c).

7. The hinge structure for a foldable mouse according to claim 6, wherein: The cam inner flat cavity (502b) is arranged in the cam cylinder body (502a), and the cam inner flat cavity (502b) is arranged to match the outer contour of the shaft (4).

8. The hinge structure for a foldable mouse according to claim 7, wherein: The high-low alternating convex-concave edge structure (502c) is arranged on one side surface of the cam cylinder body (502a), the other side surface of the cam cylinder body (502a) is connected with the spring (501) in abutment, and the high-low alternating convex-concave edge structure (502c) is engaged with the toothed sleeve connector (503).

9. The hinge structure for a foldable mouse according to claim 8, wherein: The front hinge (1) is provided with a plurality of front stop blocks (103) which are evenly arranged between the two front inner flat sleeve sleeves (102); the rear hinge (2) is provided with a plurality of rear stop blocks (203) which are evenly arranged between the two rear inner flat sleeve sleeves (202).

10. The hinge structure for a foldable mouse according to claim 9, wherein: The intermediate hinge block (3) is provided with an intermediate block (301), a hinge sleeve body (302) and a plurality of multi-stage stop clamping grooves (303); the two sides of the intermediate block (301) are each provided with a hinge sleeve body (302), and each hinge sleeve body (302) is correspondingly movably provided with a rotating shaft (4); the outer surface of each hinge sleeve body (302) is provided with a plurality of multi-stage stop clamping grooves (303); each multi-stage stop clamping groove (303) is provided with a plurality of stop blocks (303a), each front stop block (103) is movably connected in one multi-stage stop clamping groove (303), and each rear stop block (203) is movably connected in one multi-stage stop clamping groove (303).

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