CN220662946U

CN220662946U - High-speed vertical packing machine

Info

Publication number: CN220662946U
Application number: CN202322356077.XU
Authority: CN
Inventors: 孔旭鑫; 孔浩宇; 王海晓; 方昌新; 罗飞
Original assignee: Wenzhou Jiuyi Machinery Co ltd
Current assignee: Wenzhou Jiuyi Machinery Co ltd
Priority date: 2023-08-30
Filing date: 2023-08-30
Publication date: 2024-03-26
Anticipated expiration: 2033-08-30

Abstract

The utility model provides a high-speed vertical packing machine, which belongs to the technical field of packing machines and comprises a forming device, wherein the forming device comprises a forming cylinder and a mounting mechanism, the mounting mechanism comprises two fixed blocks, a mounting rack and a first mounting plate, the forming cylinder is connected with the first mounting plate, a fixed seat is arranged on the frame corresponding to the fixed blocks, a first shaft is longitudinally arranged in the fixed seat in a sliding manner, one end of the first shaft is connected with the fixed blocks, the other end of the first shaft is connected with a second mounting plate, at least two second shafts are arranged on the second mounting plate, the second shafts penetrate through the second mounting plate and are connected with a third mounting plate, the second shafts and the second mounting plate are provided with a pressing seat, and springs are sleeved on the second shafts; according to the utility model, the forming cylinder is connected through the mounting structure with the buffer function, so that the impact force generated when materials fall is reduced, and the position deviation of the forming cylinder caused by loosening of the connecting structure in the long-term use process is avoided, thereby improving the forming quality of the bag body and the consistency of the heat sealing position of the bag body.

Description

High-speed vertical packing machine

Technical Field

The utility model relates to the technical field of packaging machines, in particular to a high-speed vertical packaging machine.

Background

The vertical packing machine is a common device used in industrial production and is mainly used for packing materials such as medicines, feeds and the like. The current vertical packaging machine generally comprises a film loading mechanism, a film releasing mechanism, a film pulling mechanism, a former, a longitudinal sealing mechanism, a transverse sealing mechanism and a feeding mechanism, wherein the vertical packaging machine tightens a packaging film through the film pulling mechanism in the packaging process and then transports the packaging film to the former, the packaging film forms a cylindrical structure through the former, the longitudinal sealing mechanism seals the side surface of the cylindrical structure and simultaneously injects materials into the cylindrical structure, and finally the transverse sealing mechanism completes transverse shearing and transverse sealing.

The patent of publication No. CN218490003U discloses an accessory wrapping bag material loading assembly line among the prior art, it includes vertical packing plant, vertical packing plant includes packaging film winding mechanism and sets up the mounting panel in packaging film winding mechanism below, install the shaping hopper in proper order along packaging film winding mechanism's unloading direction on the mounting panel, indulge and seal the mechanism, packaging film feed mechanism and violently seal the mechanism, wherein form funnel-shaped shaping hopper by hopper baffle and shaping baffle, the welding has the stationary blade that is used for installing on the mounting panel on the shaping baffle, the screw has been seted up on the stationary blade, but in a large amount of materials fall into the shaping hopper, because the effect of gravity can cause the impact to the shaping hopper, in long-term use, lead to the connecting bolt between shaping hopper and the mounting panel to become flexible easily, make shaping hopper position skew, thereby influence the shaping of bag body and lead to bag heat seal position dislocation.

Disclosure of Invention

The utility model aims to overcome the defects and the shortcomings of the prior art and provides a high-speed vertical packing machine.

The technical scheme adopted by the utility model is as follows: the utility model provides a high-speed vertical packagine machine, includes the frame, be provided with feedway, confession membrane device, forming device, draw membrane device, indulge and seal device and violently seal the device in the frame, forming device upper end is towards feedway, and its lower extreme is towards violently seal the device to through drawing membrane device and indulging the encapsulation device, forming device is including a shaping section of thick bamboo and installation mechanism, a shaping section of thick bamboo is used for carrying the material in inside and at outer wall shaping bag body, installation mechanism is including the interval setting in two fixed blocks of frame, the mounting bracket that sets up between two fixed blocks and the first mounting panel that sets up on the mounting bracket, a shaping section of thick bamboo is connected in first mounting panel, the frame corresponds the fixed block and is provided with the fixing base, longitudinal sliding is provided with first axle in the fixing base, first axle one end is connected with the fixed block, and the other end is connected with the second mounting panel, be provided with two at least second axle on the second mounting panel, the second axle runs through the second mounting panel and is connected with the third mounting panel, second axle and second mounting panel are provided with the seat of pressing, the cover is equipped with the spring in the second axle respectively with the butt with the spring with the third mounting panel and pressing with the third mounting panel.

The two second shafts are provided with at least one limiting shaft, the limiting shafts penetrate through the second mounting plate, and the limiting shafts are connected with at least two limiting nuts in a threaded mode and are located on two sides of the second mounting plate respectively.

Two guide rods are arranged in parallel between the two fixing blocks, the mounting frame is arranged on the two guide rods in a sliding mode, and the fixing blocks are connected with the mounting frame through adjusting bolts.

The feeding device comprises a tray assembly, a hopper assembly and a switch assembly, wherein the tray assembly comprises a rotating seat arranged on a frame, a driving assembly used for driving the rotating seat to rotate and a tray arranged on the rotating seat, a plurality of first discharging holes are circumferentially arranged at the bottom of the tray, a synchronous rotating tray is arranged below the tray, a second discharging hole is arranged on the tray corresponding to the first discharging hole, a charging barrel is arranged in the first discharging hole and the second discharging hole, a baffle assembly is arranged at the discharging end of the second discharging hole in a rotating mode, the baffle assembly is provided with a closing state for closing the second discharging hole and an opening state for opening the second discharging hole, the switch assembly is used for enabling the baffle assembly to switch between the closing state and the opening state, a vertical plate is arranged on the frame, a first plate is arranged on the vertical plate towards the tray, a second plate is arranged on one side of the tray close to the hopper assembly, the first plate and the second plate is arranged on the moving track of the charging barrel, and the lower end face of the first plate and the second plate are in contact with the charging barrel.

The baffle assembly comprises a baffle, a fixing bolt, a pressing spring and a gasket, wherein a through hole for the fixing bolt to pass through is formed in the baffle, the fixing bolt is connected to the material plate, the pressing spring is sleeved on the fixing bolt, the gasket is arranged between the pressing spring and the baffle, the pressing spring is a conical spring, and one end of the diameter of the pressing spring is larger than that of the pressing spring towards the material plate.

The switch assembly comprises an upright post and a cross rod arranged on the upright post, wherein the cross rod is arranged towards the material plate and is provided with a linkage wheel on the moving track of the baffle, and the side wall of the baffle is provided with a linkage part matched with the linkage wheel.

The hopper assembly comprises a support, a hopper arranged on the support and a discharging barrel connected to the lower end of the hopper, wherein the discharging barrel comprises a longitudinally arranged elastic barrel body and a rigid fixing ring arranged at the upper end and the lower end of the elastic barrel body, side walls of the elastic barrel body are in butt joint and transversely arranged moving blocks, a limiting plate for the moving blocks to move is arranged on the support, one of the limiting plate and the moving blocks is provided with a proximity switch, the other of the limiting plate and the moving block is provided with an induction plate, one side of the elastic barrel body is provided with a clamping assembly, the clamping assembly is used for extruding the elastic barrel body, the proximity switch and the induction plate are arranged at a certain interval, and the clamping assembly works after the two are in contact with each other.

The clamping assembly comprises a fourth mounting plate provided with a bracket, a clamping cylinder arranged on the fourth mounting plate and two clamping blocks connected with the clamping cylinder, wherein the two clamping blocks are respectively positioned on two sides of the elastic cylinder body, each clamping block comprises a clamping end, and each clamping end is arc-shaped and tangent with the elastic cylinder body.

The beneficial effects of the utility model are as follows: according to the utility model, the forming cylinder is connected to the frame through the mounting structure with the buffer function, so that when a large amount of materials fall into the forming hopper, the impact force generated by the materials can be reduced, and the position of the forming cylinder is prevented from being deviated due to loosening of the connecting structure in the long-term use process, so that the forming quality of the bag body and the consistency of the heat sealing position of the bag body are improved.

Drawings

In order to more clearly illustrate the embodiments of the utility model or the technical solutions of the prior art, the drawings which are required in the description of the embodiments or the prior art will be briefly described, it being obvious that the drawings in the description below are only some embodiments of the utility model, and that it is within the scope of the utility model to one skilled in the art to obtain other drawings from these drawings without inventive faculty.

FIG. 1 is a schematic illustration of the present utility model;

FIG. 2 is a schematic view of a molding apparatus according to the present utility model;

FIG. 3 is a schematic diagram of a molding apparatus according to a second embodiment of the present utility model;

FIG. 4 is a partial schematic view of the present utility model;

FIG. 5 is a partial schematic view of a feeder device according to the present utility model;

FIG. 6 is a schematic view of a baffle assembly of the present utility model;

FIG. 7 is a schematic view of an opening assembly of the present utility model;

fig. 8 is an enlarged view at a in fig. 4.

Detailed Description

The utility model will now be described in further detail with reference to the accompanying drawings. The drawings are simplified schematic representations which merely illustrate the basic structure of the utility model and therefore show only the structures which are relevant to the utility model.

In the description of the present application, it should be understood that the terms "longitudinal," "radial," "length," "width," "thickness," "upper," "lower," "left," "right," "front," "rear," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like indicate orientations or positional relationships that are based on the orientation or positional relationships shown in the drawings, merely to facilitate description of the present application and simplify description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be configured and operated in a particular orientation, and therefore should not be construed as limiting the present application. In the description of the present application, unless otherwise indicated, the meaning of "a plurality" is two or more.

In the description of the present application, it should be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be either fixedly connected, detachably connected, or integrally connected, for example; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the terms in this application will be understood by those of ordinary skill in the art in a specific context.

In the description of the present application, it should be noted that, in the embodiments of the present utility model, all the expressions "first" and "second" are used to distinguish two entities with the same name and different parameters, and it is noted that the "first" and "second" are merely used for convenience of expression, and should not be construed as limiting the embodiments of the present utility model, and the following embodiments are not described in detail herein.

As shown in fig. 1 to 8, an embodiment of the present utility model is provided:

the utility model provides a high-speed vertical packagine machine, includes frame 1, be provided with feedway 2, confession membrane device 3, forming device 4, draw membrane device, indulge encapsulation device 5 and violently seal device 6 on the frame 1, forming device 4 upper end is towards feedway 2, and its lower extreme is towards violently seal device 6 to through drawing membrane device and indulging encapsulation device 5, wherein confession membrane device 3, draw membrane device, indulge encapsulation device 5 and violently seal device 6, can refer to the relevant patent of packagine machine among the prior art, or the applicant's earlier application publication number is a composite film and PE membrane high dose granule packagine machine that the patent of CN216375067U disclosed, and a vertical packagine machine's encapsulation station and a vertical packagine machine that the patent of publication number is CN 209080339U.

In this embodiment, as shown in fig. 3, the molding device 4 includes a molding cylinder 41 and a mounting mechanism, the molding cylinder 41 is used for conveying materials inside and molding a bag body on an outer wall, the mounting mechanism includes two fixing blocks 42 disposed on the frame 1 at intervals, a mounting frame 43 disposed between the two fixing blocks 42, and a first mounting plate 44 disposed on the mounting frame 43, the molding cylinder 41 is connected to the first mounting plate 44, a fixing seat 45 is disposed on the frame 1 corresponding to the fixing block 42, a first shaft 46 is disposed in the fixing seat 45 in a longitudinally sliding manner, one end of the first shaft 46 is connected with the fixing block 42, the other end is connected with a second mounting plate 47, at least two second shafts 48 are disposed on the second mounting plate 47, the second shafts 48 penetrate through the second mounting plate 47 and are connected with a third mounting plate 49, the second shaft 48 and the second mounting plate 47 are provided with a pressing seat 401, the second shaft 48 is sleeved with a spring 402, two ends of the spring 402 are respectively abutted with the pressing seat 401 and the third mounting plate 49, when a large amount of materials fall into the forming hopper, downward impact force is caused to the forming cylinder 41, the forming cylinder 41 acts on the second mounting plate 47 through the mounting frame 43, the two fixing blocks 42 and the first shaft 46 to move downwards, and meanwhile, the pressing seat 401 moves to the third mounting plate 49 to compress the spring 402, thereby playing a role of buffering the forming cylinder 41 under the action of the spring 402, connecting the forming cylinder to the frame through a mounting structure with the buffering effect, reducing impact force generated by the materials, avoiding deviation of the position of the forming cylinder caused by loosening of the connecting structure in the long-term use process, prolonging the service life of the device, meanwhile, the forming quality of the bag body and the consistency of the heat sealing position of the bag body are improved.

The two second shafts 48 are provided with at least one limiting shaft 403, the limiting shaft 403 penetrates through the second mounting plate 47, and at least two limiting nuts 404 are screwed on the limiting shaft 403 and are respectively located at two sides of the second mounting plate 47, so that the up-down movement range of the second mounting plate 47 can be limited, the spring 402 can maintain enough supporting force, and the spring 402 is prevented from being excessively compressed.

As shown in fig. 2, two guide rods 405 are disposed in parallel between the two fixing blocks 42, the mounting frame 43 is slidably disposed on the two guide rods 405, and the fixing blocks 42 are provided with adjusting bolts 406 to connect with the mounting frame 43, so that the mounting frame 43 can be transversely adjusted within a certain range, and the forming device 4 is convenient to adapt to other devices.

The feeding device 2 comprises a tray assembly 21, a hopper assembly 22 and a switch assembly 23, the tray assembly 21 comprises a rotating seat 211 arranged on the frame 1, a driving assembly for driving the rotating seat 211 to rotate and a tray 212 arranged on the rotating seat 211, the driving assembly comprises a driving motor and a gear assembly, a plurality of first discharging holes are circumferentially arranged at the bottom of the tray 212, a material plate 213 capable of synchronously rotating is arranged below the tray 212, a second discharging hole is arranged on the material plate 213 corresponding to the first discharging hole, a material cylinder 214 is arranged in the first discharging hole and the second discharging hole, the volume of the material cylinder 214 is increased, a baffle assembly 24 is rotatably arranged at the discharging end of the second discharging hole, the baffle assembly 24 is provided with a closed state for closing the second discharging hole and an open state for opening the second discharging hole, the switch assembly 23 is used for enabling the baffle assembly 24 to be switched between the closed state and the open state, the forming cylinder 41 is arranged below the baffle assembly 24, the baffle assembly 24 is arranged in the open state, and the forming cylinder 41 falls into the forming cylinder 41 when the baffle assembly 24 is in the open state.

The machine frame 1 is provided with a vertical plate 25, a first plate 251 is arranged on the vertical plate 25 towards the inside of the charging tray 212, a second plate 252 is arranged on one side of the first plate 251, which is close to the hopper assembly 22, of the first plate 251, the second plate 252 is arranged on the moving track of the charging barrel 214, the lower end faces of the first plate 251 and the second plate 252 are contacted with the upper end face of the charging barrel 214, and the quantitative charging can be carried out on one charging barrel 214 while the quantitative charging is carried out on the other charging barrel 214 through the continuous rotation of the charging tray 212, so that the material discharging time of the materials is shortened, the quantitative charging is realized by scraping the surface materials by means of the rotation of the charging tray 212 after the charging barrel 214 is filled with the materials in the bag body each time, the quantitative charging effect is good, and the quantitative discharging efficiency is high.

The baffle assembly 24 comprises a baffle 241, a fixing bolt 242, a pressing spring 243 and a gasket, wherein a through hole for the fixing bolt 242 to pass through is formed in the baffle 241, the fixing bolt 242 is connected to the material plate 213, the pressing spring 243 is sleeved on the fixing bolt 242, the gasket is arranged between the pressing spring 243 and the baffle 241, the baffle 241 is pressed against the second discharge hole through the pressing spring 243, the material is prevented from falling, the pressing spring 243 adopts a conical spring, one end of the diameter of the pressing spring is larger than that of the pressing spring 243 and faces the material plate 213, the supporting force of the baffle 241 is improved, and the baffle 241 can better seal the second discharge hole.

The switch assembly 23 includes a stand 231 and a cross bar 232 disposed on the stand 231, the cross bar 232 is disposed towards the material plate 213 and is provided with a linkage wheel 233 on a moving track of the baffle 241, a linkage part matched with the linkage wheel 233 is disposed on a side wall of the baffle 241, when the baffle 241 passes the linkage wheel 233, the baffle 241 is firstly opened to discharge, and then the baffle 241 is closed after discharging, in addition, the switch assembly 23 may further be: two sets of upright posts, cross bars and linkage wheels, one set is arranged on the discharging side for opening the baffle 241, and the other set is arranged on the feeding side for closing the baffle 241 before feeding; the method can also be as follows: a reset member is mounted to the shutter assembly 24 to maintain it in a closed position and is opened when passing through the switch assembly 23.

The hopper assembly 22 comprises a bracket 221, a hopper 222 arranged on the bracket 221, and a discharging barrel 223 connected to the lower end of the hopper 222, wherein the discharging barrel 223 comprises a longitudinally arranged elastic barrel 201 and a rigid fixing ring 202 arranged at the upper end and the lower end of the elastic barrel 201, in the embodiment, the elastic barrel 201 is made of rubber materials, the rigid fixing ring 202 is made of metal materials, such as stainless steel, when the elastic barrel is blocked, the side wall of the elastic barrel is outwards expanded to be arc-shaped, the side wall of the elastic barrel 201 is abutted against a moving block 203 which is transversely arranged, a limiting plate 204 for the moving block 203 to move is arranged on the bracket 221, one of the limiting plate 204 and the moving block 203 is provided with a proximity switch 205, the other one of the limiting plate and the moving block 203 is provided with a sensing plate 206, one side of the elastic barrel 201 is provided with a clamping assembly, the clamping assembly is used for extruding the elastic barrel 201, when the elastic barrel is blocked, the side wall of the elastic barrel is expanded, the moving block is pushed to enable the sensing plate 206 to touch the proximity switch 205, and the clamping assembly is continuously extruded and the elastic barrel 201 at a certain frequency to perform dredging, and the discharging barrel is prevented from being internally provided with stirring blades, and meanwhile, the stirring blade is convenient to maintain and the speed is kept.

The proximity switch 205 and the sensing plate 206 are arranged at a certain interval, and the clamping assembly works after the proximity switch 205 and the sensing plate 206 touch each other, wherein the interval is adjusted according to the actual situation, a certain distance value can be preset, and the proximity switch 205 and the sensing plate 206 are prevented from touching each other when materials normally pass through.

The clamping assembly comprises a fourth mounting plate 207 provided with a bracket 221, a clamping cylinder 208 arranged on the fourth mounting plate 207 and two clamping blocks 209 connected with the clamping cylinder 208, wherein the two clamping blocks 209 are respectively positioned on two sides of the elastic cylinder 201, the clamping blocks 209 comprise clamping ends 210, the clamping ends 210 are arc-shaped and tangent with the elastic cylinder 201, the contact area is reduced, the pressure is increased, the better extrusion effect is achieved, and accordingly the discharging cylinder 223 is quickly dredged.

The foregoing disclosure is illustrative of the present utility model and is not to be construed as limiting the scope of the utility model, which is defined by the appended claims.

Claims

1. The high-speed vertical packaging machine comprises a frame (1), a feeding device (2), a film feeding device (3), a forming device (4), a film pulling device, a longitudinal sealing device (5) and a transverse sealing device (6) are arranged on the frame (1), the upper end of the forming device (4) faces the feeding device (2), the lower end of the forming device faces the transverse sealing device (6) and passes through the film pulling device and the longitudinal sealing device (5), the high-speed vertical packaging machine is characterized in that the forming device (4) comprises a forming cylinder (41) and a mounting mechanism, the forming cylinder (41) is used for conveying materials inside and forming a bag body on the outer wall, the mounting mechanism comprises two fixing blocks (42) arranged on the frame (1) at intervals, a mounting frame (43) arranged between the two fixing blocks (42) and a first mounting plate (44) arranged on the mounting frame (43), the forming cylinder (41) is connected with the first mounting plate (44), the frame (1) is correspondingly provided with a fixing seat (45) corresponding to the fixing block (42), a first shaft (46) is longitudinally arranged in the fixing seat (45) in a sliding manner, the first shaft (46) is connected with at least two second shafts (47) are arranged at the other ends (47), the second shaft (48) penetrates through the second mounting plate (47) and is connected with a third mounting plate (49), the second shaft (48) and the second mounting plate (47) are provided with a pressing seat (401), a spring (402) is sleeved on the second shaft (48), and two ends of the spring (402) are respectively abutted against the pressing seat (401) and the third mounting plate (49).

2. A high-speed vertical packing machine according to claim 1, characterized in that two of said second shafts (48) are provided with at least one limiting shaft (403), said limiting shaft (403) penetrating said second mounting plate (47), said limiting shaft (403) being threaded with at least two limiting nuts (404) and being located on either side of the second mounting plate (47).

3. A high-speed vertical packing machine according to claim 1, characterized in that two guide rods (405) are arranged in parallel between two fixed blocks (42), the mounting frame (43) is slidably arranged on the two guide rods (405), and the fixed blocks (42) are provided with adjusting bolts (406) to connect with the mounting frame (43).

4. The high-speed vertical packing machine according to claim 1, wherein the feeding device (2) comprises a tray assembly (21), a hopper assembly (22) and a switch assembly (23), the tray assembly (21) comprises a rotating seat (211) arranged on the frame (1), a driving assembly for driving the rotating seat (211) to rotate and a tray (212) arranged on the rotating seat (211), a plurality of first discharging holes are circumferentially arranged at the bottom of the tray (212), a synchronously rotating tray (213) is arranged below the tray (212), a second discharging hole is arranged on the tray (213) corresponding to the first discharging hole, a feed cylinder (214) is arranged in the first discharging hole and the second discharging hole, a baffle assembly (24) is rotatably arranged at the discharging end of the second discharging hole, the baffle assembly (24) has a closed state for closing the second discharging hole and an open state for opening the second discharging hole, the switch assembly (23) is used for enabling the baffle assembly (24) to be arranged between the closed state and the open state, a tray (251) is arranged in the vertical tray (25) and is arranged on the first side (22), the first plate (251) and the second plate (252) are arranged on the moving track of the charging barrel (214), and the lower end surfaces of the first plate and the second plate are contacted with the upper end surface of the charging barrel (214).

5. The high-speed vertical packing machine according to claim 4, wherein the baffle assembly (24) comprises a baffle (241), a fixing bolt (242), a pressing spring (243) and a gasket, the baffle (241) is provided with a through hole for the fixing bolt (242) to pass through, the fixing bolt (242) is connected to the material plate (213), the pressing spring (243) is sleeved on the fixing bolt (242), the gasket is arranged between the pressing spring (243) and the baffle (241), and the pressing spring (243) adopts a conical spring, and one end with a larger diameter faces the material plate (213).

6. The high-speed vertical packing machine according to claim 5, wherein the switch assembly (23) comprises a column (231) and a cross bar (232) arranged on the column (231), the cross bar (232) is arranged towards the material plate (213) and is provided with a linkage wheel (233) on the moving track of the baffle plate (241), and the side wall of the baffle plate (241) is provided with a linkage part matched with the linkage wheel (233).

7. The high-speed vertical packing machine according to claim 6, wherein the hopper assembly (22) comprises a bracket (221), a hopper (222) arranged on the bracket (221) and a discharging barrel (223) connected to the lower end of the hopper (222), the discharging barrel (223) comprises a longitudinally arranged elastic barrel (201) and a rigid fixing ring (202) arranged at the upper end and the lower end of the elastic barrel (201), the side wall of the elastic barrel (201) is abutted against a moving block (203) which is transversely arranged, a limiting plate (204) for the moving block (203) to move is arranged on the bracket (221), one of the limiting plate (204) and the moving block (203) is provided with a proximity switch (205), the other one of the limiting plate and the moving block is provided with a sensing plate (206), one side of the elastic barrel (201) is provided with a clamping assembly, the clamping assembly is used for extruding the elastic barrel (201), and the proximity switch (205) and the sensing plate (206) are arranged at a certain interval, and the clamping assembly works after the two are abutted against each other.

8. The high-speed vertical packing machine according to claim 7, wherein the clamping assembly comprises a fourth mounting plate (207) provided with a bracket (221), a clamping cylinder (208) arranged on the fourth mounting plate (207) and two clamping blocks (209) connected with the clamping cylinder (208), the two clamping blocks (209) are respectively positioned at two sides of the elastic cylinder (201), the clamping blocks (209) comprise clamping ends (210), and the clamping ends (210) are arc-shaped and tangent with the elastic cylinder (201).