Cable cutting device capable of conveniently fixing cable

Abstract

The invention discloses a cable cutting device convenient for fixing a cable, and relates to the technical field of cable cutting. The device comprises a base, two sets of cutting devices and two sets of fixing devices, the circle centers of the two sets of cutting devices and the two sets of fixing devices are located on the same horizontal line, and each set of cutting device comprises a fixing disc, six movable sector plates evenly moving in the six directions of the circle center and a rotating disc controlling the six movable sector plates to move and further comprises a connecting column. The number of the connecting columns is six, each connecting column is composed of two vertical pipes and a transverse pipe, the transverse pipe is connected between the two vertical pipes, the cutting device and the fixing device are used in cooperation, cables of different sizes can be fixed to be cut, and during cutting, the cables making contact with the two clamping ends are not prone to generating indentations.

Description

Technical Field

[0001] The invention relates to the technical field of cable cutting, and in particular to a cable cutting device which is convenient for fixing cables. Background Art

[0002] In some specific application scenarios, such as automated production lines, mechanical equipment, etc., the length of the cable needs to be precisely controlled to meet the requirements of the equipment. At this time, the cable needs to be precisely cut to ensure that its length meets the equipment requirements.

[0003] In the patent document with the publication number: CN113857396B, a cable cutting device for fixing cables is disclosed, including a platform, a bracket is provided at the bottom of the platform, two guide clamping assemblies are horizontally provided on the upper part of the platform and are arranged opposite to each other, and the guide clamping assemblies are fixedly connected to the platform through a fixing plate, and the cable passes through the two guide clamping assemblies; the platform is provided with a cutting mechanism, and the cutting mechanism can correspondingly cut the cable segment between the two guide clamping assemblies; the guide clamping assembly includes a guide cylinder, a shoulder is provided at one end of the guide cylinder, and a plurality of clamping claws are provided on the end face of the shoulder, and the shoulders of the two guide clamping assemblies and the corresponding plurality of clamping claws are arranged opposite to each other. The present invention can effectively fix the cable and perform cutting operations, avoid the problem of slippage when the cable is not fixed or fixed at a single place during cutting, reduce the trouble of manually fixing the cable, ensure safe operation, improve work efficiency, and has the advantages of convenient operation, safety, and high efficiency.

[0004] This patent and the prior art have the following technical problems in actual use:

[0005] 1. This patent controls the swing of the clamp to fix the cable by moving the pressing sleeve. If stability is to be maintained, the teeth on the clamp can fix the cable, but only cables with the same diameter can be fixed.

[0006] 2. This patent uses a saw blade to cut the cable, which is suitable for cutting thicker cables. Single-sided cutting of thinner cables requires a large clamping force on the cable, which can easily cause indentations on thinner and softer cables. Summary of the invention

[0007] The purpose of the present invention is to solve the above problems and provide a cable cutting device which is convenient for fixing cables.

[0008] In order to achieve the above-mentioned purpose, the present invention specifically adopts the following technical solutions:

[0009] A cable cutting device convenient for fixing cables comprises a base, two groups of cutting devices and two groups of fixing devices, the centers of the two groups of cutting devices and the two groups of fixing devices are on the same horizontal line, each group of the cutting devices comprises a fixed disk, six movable sector plates that move evenly along the six directions of the center of the circle and a rotating disk that controls the movement thereof, the fixed disk is provided with six mutually intersecting straight grooves, an integrally formed fixing ring is fixedly installed on the side of the fixed disk away from the movable sector plates, a regular hexagon is surrounded between the straight grooves, each of the movable sector plates moves along the trajectory of each of the straight grooves, a blade is fixedly installed on one side of the six movable sector plates, each group of the fixing devices comprises an annular chassis, an annular spring and six pressure plates that can move radially on the annular chassis, an integrally formed annular outer frame is fixedly installed on the outer side of the annular chassis, a first driving device for moving the two annular outer frames and a second driving device for moving the cutting devices of the two groups of cutting devices are provided on the base;

[0010] It also includes connecting columns, the number of which is six, and the connecting columns are composed of two vertical tubes and one horizontal tube. A horizontal tube is connected in the middle of the two vertical tubes. The center of the upper vertical tube is on the same vertical line as the end point of the straight section of the movable sector plate. The other end of the upper vertical tube is fixedly installed with the corresponding pressure plate. A circular groove is provided on the movable sector plate, and the other end of the lower vertical tube can be detachably plugged into the corresponding circular groove.

[0011] Furthermore, the rotating disk includes a collar, a rotating ring and six oblique limit rods evenly distributed along the center of the rotating ring. The inner wall of the collar is fixedly installed with integrally formed protrusions on the upper and lower sides. The distance between the two protrusions is the same as the thickness of the fixed disk. The oblique limit rod is connected to the upper protrusion and the rotating ring. An oblique track is provided on the oblique limit rod. A rectangular plate is fixedly installed on the two collars.

[0012] Furthermore, the arc-shaped end of the movable sector plate is fixedly installed with the special-shaped connecting block, the upper part of the special-shaped connecting block is fixedly installed with a short column, and the bottom of the special-shaped connecting block is fixedly installed with an integrally formed slide plate, the slide plate corresponds to the straight groove, the short column slides on the oblique limiting rod, and the outer wall of the short column is adjacent to the wall surface of the oblique limiting rod located on the oblique track.

[0013] Furthermore, the upper wall surface of the movable sector plate is adjacent to the bottom surface of the rotating ring, and the lower wall surface of the special-shaped connecting block is adjacent to the upper wall surface of the fixed disk.

[0014] Furthermore, an annular through groove for accommodating an annular spring is provided in the middle of the outer wall of the annular chassis, and through holes corresponding to the pressure plate are symmetrically provided on the annular chassis along the center of the circle. The cross-section of the annular outer frame is L-shaped, and an accommodating cavity is formed between the annular chassis and the annular outer frame, and a top plate is fixedly mounted on the annular outer frame.

[0015] Furthermore, a deformable arc-shaped rubber pad is provided at the end of the pressure plate close to the center of the circle, a plurality of micro springs are fixedly installed between the end of the pressure plate close to the center of the circle and the annular outer frame, and a short arc-shaped groove for accommodating a part of the annular spring is provided at the end of the pressure plate away from the center of the circle, and the cross-section of the short arc-shaped groove is the same as the cross-section of the annular through groove, both of which are semicircular. When the annular spring is in a natural state, the end of the pressure plate away from the center of the circle is within the projection range of the annular chassis. When the annular spring is stretched, the end of the pressure plate away from the center of the circle protrudes to the outside of the annular chassis.

[0016] Furthermore, a first accommodating cavity is provided in the middle of the upper end of the base, and two second accommodating cavities are provided on both sides of the first accommodating cavity on the base. The first accommodating cavity is longer than the second accommodating cavity, and the size is marked on one side of the second accommodating cavity on the base.

[0017] Further, the first driving device includes a first threaded rod, a first motor and two first sliders, each group of the second driving device includes a second threaded rod, a second motor and two second sliders, the first threaded rod and the second threaded rod are both threaded rods with different rotation directions from the center to both sides, the two first sliders are inserted on the first threaded rod and are located on both sides of the center, the two second sliders in each group of the second driving device are inserted on the second threaded rod and are located on both sides of the center, the first threaded rod is inserted on the base at a position in the first accommodating cavity, the first threaded rod is located on the outside of the base and is fixedly installed together with the output shaft of the first motor, the second threaded rod is inserted on the base at a position in the second accommodating cavity, the second threaded rod is located on the outside of the base and is fixedly installed together with the output shaft of the second motor, a stepper motor driver is electrically connected between the two second motors, the first slider is fixedly installed together with the annular outer frame, and the two second sliders are fixedly installed together with the fixing ring.

[0018] The beneficial effects of the present invention are as follows:

[0019] 1. The present invention clamps the cable by the elastic force of the annular spring itself. Due to the elastic deformation ability of the spring, the spring clamping can adapt to workpieces of different sizes, with a wide clamping range. Moreover, for softer cables, a more uniform clamping force can avoid the generation of clamp marks.

[0020] 2. Compared with unidirectional cutting, the present invention does not require too much clamping force at the clamping end during the cutting process by cutting all around. Due to the cutting all around, the stress generated during the cutting process is more dispersed, which is not easy to cause excessive local stress and does not require a larger clamping force to fix the material. It is similar to holding the two ends of a rope, cutting downward with a knife and cutting horizontally with scissors. In this way, the use of circumferential cutting can further avoid the generation of cable clamp marks at the clamping end.

[0021] In summary, by using the cutting device and the fixing device in coordination, not only can cables of different sizes be fixed for cutting, but also the cables contacted by the two clamping ends are not prone to indentation during cutting. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is an overall schematic diagram of the present invention;

[0023] Figure 2 It is an overall schematic diagram of the cutting device of the present invention;

[0024] Figure 3 It is a schematic diagram of disassembly and assembly of the cutting device of the present invention;

[0025] Figure 4 is a schematic diagram of the fixing device of the present invention;

[0026] Figure 5 It is a schematic diagram of disassembly and assembly of the fixing device of the present invention;

[0027] Figure 6 It is a schematic diagram of the relationship between the connecting column, the pressing plate, and the movable sector plate of the present invention;

[0028] Figure 7 It is a schematic diagram of a pressing plate of the present invention;

[0029] Figure 8 It is a schematic diagram of the state of the cutting device when it completes cutting.

[0030] Figure numerals: 1, base; 11, first accommodating chamber; 12, second accommodating chamber; 2, cutting device; 21, fixed plate; 211, linear groove; 212, fixed ring; 22, movable sector plate; 221, circular groove; 222, special-shaped connecting block; 223, short column; 224, slide plate; 23, rotating plate; 231, collar; 232, rotating ring; 233, oblique limiting rod; 234, protrusion; 235, oblique track; 236, rectangular plate; 3, fixing device; 31, annular chassis; 311, ring shaped outer frame; 312, accommodating cavity; 313, annular groove; 314, through hole; 32, annular spring; 33, pressure plate; 331, arc-shaped rubber pad; 332, micro spring; 333, short arc-shaped groove; 34, top plate; 4, connecting column; 41, vertical tube; 42, horizontal tube; 5, first driving device; 51, first threaded rod; 52, first motor; 53, first slider; 6, second driving device; 61, second threaded rod; 62, second motor; 63, second slider; 64, stepper motor driver; 7, blade. DETAILED DESCRIPTION

[0031] To make the purpose, technical solution and advantages of the embodiments of the present invention more clear, the technical solution in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention.

[0032] A cable cutting device for facilitating fixing of cables according to a preferred embodiment of the present invention will be described in detail below.

[0033] Embodiment 1, as Figure 1-Figure 8 As shown, a cable cutting device for fixing cables comprises a base 1, two groups of cutting devices 2 and two groups of fixing devices 3. The centers of the two groups of cutting devices 2 and the two groups of fixing devices 3 are on the same horizontal line. Each group of cutting devices 2 comprises a fixed disk 21, six movable sector plates 22 that move uniformly in six directions along the center of the circle and a rotating disk 23 for controlling the movement thereof. The fixed disk 21 is provided with six mutually intersecting linear grooves 211. An integrally formed fixing ring 212 is fixedly installed on one side of the fixed disk 21 away from the movable sector plate 22. The linear grooves 211 are arranged on the fixed disk 21. A regular hexagon is formed between the six moving sector plates 22, each moving sector plate 22 moves along the track of each straight groove 211, a blade 7 is fixedly installed on one side of the six moving sector plates 22, each set of fixing devices 3 includes an annular chassis 31, an annular spring 32 and six pressing plates 33 that can move radially on the annular chassis 31, an integrally formed annular outer frame 311 is fixedly installed on the outer side of the annular chassis 31, and a first driving device 5 for moving the two annular outer frames 311 and a second driving device 6 for moving the two sets of cutting devices 2 are arranged on the base 1;

[0034] It also includes connecting columns 4, the number of which is six, and the connecting columns 4 are composed of two vertical tubes 41 and one horizontal tube 42. A horizontal tube 42 is connected in the middle of the two vertical tubes 41. The center of the upper vertical tube 41 is on the same vertical line as the end point of the straight section of the movable sector plate 22. The other end of the upper vertical tube 41 is fixedly installed with the corresponding pressure plate 33. A circular groove 221 is opened on the movable sector plate 22, and the other end of the lower vertical tube 41 can be detachably plugged into the corresponding circular groove 221.

[0035] During operation, the two sets of fixing devices 3 are moved so that the connecting columns 4 connected to the pressing plates 33 on the two sets of fixing devices 3 are plugged into the six movable sector plates 22 on the two sets of cutting devices 2. The two rotating disks 23 are rotated counterclockwise, and the rotating disks 23 drive the six movable sector plates 22 to rotate. Under the action of the connecting columns 4, the six pressing plates 33 connected to the connecting columns 4 are radially moved, thereby enlarging the area formed between the pressing plates 33, and the annular spring 32 is stretched, and the cable is passed through the two sets of fixing devices 3 and the center of the two sets of cutting devices 2 to ensure that both ends of the cable are straightened, and then the two sets of cutting devices 2 are released. , under the action of the annular spring 32, the six pressure plates 33 move radially toward the center of the circle and stop when they reach the contact end of the cable, thereby clamping the cable. Then, according to the required length of the cable, the two sets of cutting devices 2 are moved to the required position. Since the six connecting columns 4 are separated from the six pressure plates 33, the fan-shaped plate 22 on the cutting device 2 and the pressure plate 33 on the fixing device 3 will not move synchronously. At this time, the two rotating disks 23 are rotated clockwise to make the regular hexagonal opening area formed between the six moving fan-shaped plates 22 change from large to small and then disappear completely, and the blades 7 on the six moving fan-shaped plates 22 can cut the cable.

[0036] It is worth noting that the center of the upper vertical tube 41 in the connecting column 4 is on the same vertical line as the end point of the straight segment of the movable sector plate 22, the other end of the upper vertical tube 41 is fixedly installed with the corresponding pressure plate 33, the center of the upper vertical tube 41 is on the same plane as the central axis of the pressure plate 33, and the other end of the lower vertical tube 41 is detachably plugged into the corresponding circular groove 221. Since the moving length of the center point of the circular groove 221 is the same as the moving length of the end point of the straight segment of the movable sector plate 22, and the end point of the straight segment of the movable sector plate 22 moves radially along the center of the cutting device 2, such a design can make the moving trajectory of the pressure plate 33 the same as the moving trajectory of the end of the movable sector plate 22. Since the centers of the two groups 2 and the two groups 3 are on the same horizontal line, this can ensure that the pressure plate 33 moves radially along the center of the annular chassis 31.

[0037] Embodiment 2 provides a rotating disk 23;

[0038] like Figure 2-Figure 3As shown, the rotating disk 23 includes a collar 231, a rotating ring 232 and six oblique limiting rods 233 evenly distributed along the center of the rotating ring 232. The inner wall of the collar 231 is fixedly installed with integrally formed protrusions 234 on both sides. The distance between the two protrusions 234 is the same as the thickness of the fixed disk 21. The oblique limiting rod 233 is connected to the upper protrusion 234 and the rotating ring 232. An oblique track 235 is provided on the oblique limiting rod 233. A rectangular plate 236 is fixedly installed on the two collars 231.

[0039] Furthermore, a special-shaped connecting block 222 is fixedly installed on the arc-shaped end of the movable sector plate 22, a short column 223 is fixedly installed on the upper part of the special-shaped connecting block 222, and an integrally formed slide plate 224 is fixedly installed on the bottom of the special-shaped connecting block 222. The slide plate 224 corresponds to the straight groove 211, and the short column 223 slides on the oblique limiting rod 233. The outer wall of the short column 223 is adjacent to the wall surface of the oblique limiting rod 233 located on the oblique track 235.

[0040] Furthermore, the upper wall surface of the movable sector plate 22 is adjacent to the bottom surface of the rotating ring 232 , and the lower wall surface of the special-shaped connecting block 222 is adjacent to the upper wall surface of the fixed plate 21 .

[0041] Embodiment 3 provides an annular chassis 31;

[0042] like Figure 4-Figure 7 As shown, an annular through groove 313 for accommodating the annular spring 32 is provided in the middle of the outer wall of the annular chassis 31, and a through hole 314 corresponding to the pressure plate 33 is symmetrically provided on the annular chassis 31 along the center of the circle. The cross-section of the annular outer frame 311 is L-shaped, and an accommodating cavity 312 is formed between the annular chassis 31 and the annular outer frame 311, and a top plate 34 is fixedly mounted on the annular outer frame 311.

[0043] Furthermore, a deformable arc-shaped rubber pad 331 is provided at the end of the pressure plate 33 close to the center of the circle, and a plurality of micro springs 332 are fixedly installed between the end of the pressure plate 33 close to the center of the circle and the annular outer frame 311. A short arc-shaped groove 333 for accommodating a part of the annular spring 32 is provided at the end of the pressure plate 33 away from the center of the circle. The cross-section of the short arc-shaped groove 333 is the same as the cross-section of the annular through groove 313, both of which are semicircular. When the annular spring 32 is in a natural state, the end of the pressure plate 33 away from the center of the circle is within the projection range of the annular chassis 31. When the annular spring 32 is stretched, the end of the pressure plate 33 away from the center of the circle protrudes to the outside of the annular chassis 31.

[0044] Embodiment 4 provides a base 1;

[0045] like Figure 1As shown, a first accommodating cavity 11 is provided in the middle of the upper end of the base 1, and two second accommodating cavities 12 are provided on both sides of the first accommodating cavity 11 on the base 1. The first accommodating cavity 11 is longer than the second accommodating cavity 12, and the size is marked on one side of the second accommodating cavity 12 on the base 1.

[0046] Furthermore, the first driving device 5 includes a first threaded rod 51, a first motor 52 and two first sliders 53, and each set of the second driving devices 6 includes a second threaded rod 61, a second motor 62 and two second sliders 63. The first threaded rod 51 and the second threaded rod 61 are threaded rods with different rotation directions from the center to the sides. The two first sliders 53 are inserted on the first threaded rod 51 and are located on both sides of the center. The two second sliders 63 in each set of the second driving devices 6 are inserted on the second threaded rod 61 and are located on both sides of the center. The first threaded rod 51 is inserted in the base The base 1 is located at the position of the first accommodating cavity 11, the first threaded rod 51 is located at one end outside the base 1 and is fixedly installed with the output shaft of the first motor 52, the second threaded rod 61 is inserted into the position of the second accommodating cavity 12 on the base 1, the second threaded rod 61 is located at one end outside the base 1 and is fixedly installed with the output shaft of the second motor 62, a stepper motor driver 64 is electrically connected between the two second motors 62, the first slider 53 is fixedly installed with the annular outer frame 311, and the two second sliders 63 are fixedly installed with the fixing ring 212.

[0047] The above description of the disclosed embodiments enables one skilled in the art to implement or use the present invention. Various modifications to these embodiments will be apparent to one skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but rather to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A cable cutting device for fixing cables, comprising a base (1), two sets of cutting devices (2) and two sets of fixing devices (3), characterized in that: The centers of the two groups of cutting devices (2) and the two groups of fixing devices (3) are on the same horizontal line. Each group of cutting devices (2) comprises a fixing disk (21), six movable sector plates (22) that move evenly in six directions along the center of the circle, and a rotating disk (23) that controls the movement thereof. The fixing disk (21) is provided with six mutually intersecting linear grooves (211). An integrally formed fixing ring (212) is fixedly installed on one side of the fixing disk (21) away from the movable sector plates (22). The linear grooves (211) form a regular hexagon. Each movable sector plate (22) moves along each of the six linear grooves (211). The six movable sector plates (22) are arranged to move along the track of the linear grooves (211); a blade (7) is fixedly mounted on one side of each of the six movable sector plates (22); each group of the fixing devices (3) comprises an annular chassis (31), an annular spring (32) and six pressing plates (33) capable of radially moving on the annular chassis (31); an integrally formed annular outer frame (311) is fixedly mounted on the outer side of the annular chassis (31); a first driving device (5) for moving the two annular outer frames (311) and a second driving device (6) for moving the two groups of cutting devices (2) are arranged on the base (1); It also includes a connecting column (4), the number of the connecting columns (4) is six, the connecting column (4) is composed of two vertical tubes (41) and a horizontal tube (42), the two vertical tubes (41) are connected to a horizontal tube (42) in the middle, the center of the upper vertical tube (41) and the end point of the straight section of the movable sector plate (22) are on the same vertical line, the other end of the upper vertical tube (41) is fixedly installed with the corresponding pressing plate (33), the movable sector plate (22) is provided with a circular groove (221), and the other end of the lower vertical tube (41) is detachably plugged into the corresponding circular groove (221).

2. A cable cutting device for facilitating fixing of cables according to claim 1, characterized in that: The rotating disk (23) comprises a collar (231), a rotating ring (232) and six oblique limiting rods (233) evenly distributed along the center of the rotating ring (232); the inner wall of the collar (231) is fixedly mounted with integrally formed protrusions (234) on both upper and lower sides; the distance between the two protrusions (234) is the same as the thickness of the fixed disk (21); the oblique limiting rod (233) is connected to the upper protrusion (234) and the rotating ring (232); an oblique track (235) is provided on the oblique limiting rod (233); and a rectangular plate (236) is fixedly mounted on the two collars (231).

3. A cable cutting device for facilitating fixing of cables according to claim 2, characterized in that: The arc-shaped end of the movable sector plate (22) is fixedly mounted with the special-shaped connecting block (222), the upper part of the special-shaped connecting block (222) is fixedly mounted with a short column (223), the bottom of the special-shaped connecting block (222) is fixedly mounted with an integrally formed slide plate (224), the slide plate (224) corresponds to the linear groove (211), the short column (223) slides on the oblique limiting rod (233), and the outer wall of the short column (223) is adjacent to the wall surface of the oblique limiting rod (233) located on the oblique track (235).

4. A cable cutting device for facilitating fixing of cables according to claim 3, characterized in that: The upper wall surface of the movable sector plate (22) is adjacent to the bottom surface of the rotating ring (232), and the lower wall surface of the special-shaped connecting block (222) is adjacent to the upper wall surface of the fixed plate (21).

5. A cable cutting device for facilitating fixing of cables according to claim 1, characterized in that: An annular through groove (313) for accommodating the annular spring 3 (2) is provided in the middle of the outer wall of the annular chassis (31), and through holes (314) corresponding to the pressure plate (33) are symmetrically provided on the annular chassis (31) along the center of the circle. The cross section of the annular outer frame (311) is L-shaped, and an accommodating cavity (312) is formed between the annular chassis (31) and the annular outer frame (311). A top plate (34) is fixedly mounted on the annular outer frame (311).

6. A cable cutting device for facilitating fixing of cables according to claim 5, characterized in that: A deformable arc-shaped rubber pad (331) is provided at the end of the pressing plate (33) close to the center of the circle, and a plurality of micro springs (332) are fixedly installed between the end of the pressing plate (33) close to the center of the circle and the annular outer frame (311). A short arc-shaped groove (333) for accommodating a part of the annular spring (32) is provided at the end of the pressing plate (33) away from the center of the circle, and the cross section of the short arc-shaped groove (333) is the same as the cross section of the annular through groove (313), and both are semicircular. When the annular spring (32) is in a natural state, the end of the pressing plate (33) away from the center of the circle is within the projection range of the annular chassis (31). When the annular spring (32) is stretched, the end of the pressing plate (33) away from the center of the circle protrudes to the outside of the annular chassis (31).

7. A cable cutting device for facilitating fixing of cables according to claim 1, characterized in that: A first accommodating cavity (11) is provided in the middle of the upper end of the base (1), and two second accommodating cavities (12) are provided on the base (1) on both sides of the first accommodating cavity (11), the first accommodating cavity (11) is longer than the second accommodating cavity (12), and a size is marked on one side of the second accommodating cavity (12) on the base (1).

8. A cable cutting device for facilitating fixing of cables according to claim 7, characterized in that: The first driving device (5) comprises a first threaded rod (51), a first motor (52) and two first sliders (53); each set of the second driving devices (6) comprises a second threaded rod (61), a second motor (62) and two second sliders (63); the first threaded rod (51) and the second threaded rod (61) are both threaded rods with different rotation directions from the center to the two sides; the two first sliders (53) are inserted on the first threaded rod (51) and are located on both sides of the center; the two second sliders (63) in each set of the second driving devices (6) are inserted on the second threaded rod (61) and are located on both sides of the center; the first threaded rod (51) is inserted on the base (1) The first threaded rod (51) is located at a position of the first accommodating cavity (11), one end of the first threaded rod (51) located outside the base (1) is fixedly mounted together with the output shaft of the first motor (52), the second threaded rod (61) is inserted into the base (1) and located at a position of the second accommodating cavity (12), one end of the second threaded rod (61) located outside the base (1) is fixedly mounted together with the output shaft of the second motor (62), a stepper motor driver (64) is electrically connected between the two second motors (62), the first slider (53) is fixedly mounted together with the annular outer frame (311), and the two second sliders (63) are fixedly mounted together with the fixing ring (212).

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