CN219372699U - Positioning mechanism and plug-in mechanism - Google Patents

Abstract

The utility model belongs to the technical field of plug-in equipment, and particularly relates to a positioning mechanism and a plug-in mechanism, which comprise a frame; at least one positioning area is arranged in the frame, and each positioning area is correspondingly provided with a positioning component; the positioning assembly comprises a plurality of laser positioners; the plurality of laser positioners are arranged on the frame, the plurality of laser positioners are positioned around the positioning area, and the plurality of laser positioners irradiate to the middle area of the positioning area so as to position products placed in the middle area of the positioning area; the pins of the electronic component are accurately positioned by emitting laser to irradiate the periphery of the pins of the electronic component respectively through the plurality of laser positioners, so that the pins of the electronic component are accurately aligned with the conductive jacks of the circuit board, the pins of the electronic component can be accurately inserted into the conductive jacks of the circuit board, and the phenomenon that the electronic component is askew and the like is avoided.

Description

Positioning mechanism and plug-in mechanism

Technical Field

The utility model belongs to the technical field of plug-in equipment, and particularly relates to a positioning mechanism and a plug-in mechanism.

Background

The plug-in machine is automatic production equipment commonly used by electronic enterprises, and comprises a plug-in device and a conveying device in the prior art; the clamping head of the plug-in device can be used for clamping the electronic element (electronic component) on the feeding device or the feeding fixing position, and inserting the electronic element into the conductive through hole of the printed circuit board on the conveying device to realize automatic plug-in.

The existing plug-in device lacks an electronic element positioning mechanism, when a clamping head of the plug-in device grabs an electronic element on a feeding device or a feeding fixed position, if deviation occurs in the position of the electronic element on the clamping head, the pin of the electronic element and a conductive jack of a circuit board cannot be aligned accurately, and phenomena such as plug-in failure, plug-in skew and the like occur. For example: the utility model discloses a component clamping mechanism for a component inserter, which comprises a fixing frame, a first driving mechanism, a second driving mechanism, a rotating mechanism and a clamping jaw mechanism, wherein the rotating mechanism comprises a rotating shaft and a rotating arm rotatably arranged on the rotating shaft, the rotating shaft is fixedly arranged on the fixing frame, a first rotating end and a second rotating end are respectively arranged at two ends of the rotating arm, the second driving mechanism is fixedly arranged on one side of the fixing frame, an output end of the second driving mechanism is connected with a pressure head connecting piece, the clamping jaw mechanism comprises a first clamping jaw, a second clamping jaw and a third clamping jaw which are arranged side by side, and lower ends of the first clamping jaw, the second clamping jaw and the third clamping jaw are respectively bent upwards to form a first clamping end, a second clamping end and a third clamping end. The component clamping mechanism for the component inserter has the technical problems.

Therefore, it is needed to provide a card mechanism with electronic component positioning function to solve the above-mentioned technical problems.

Disclosure of Invention

The utility model aims to provide a positioning mechanism, which aims to solve the technical problems that when a clamping head of an insertion device in the prior art grabs an electronic element on a feeding device or a feeding fixed position, if deviation occurs in the position of the electronic element on the clamping head, pins of the electronic element cannot be aligned with conductive jacks of a circuit board accurately, and phenomena such as insertion skew occur.

In order to achieve the above object, a positioning mechanism provided by an embodiment of the present utility model includes a frame; at least one positioning area is arranged in the frame, and each positioning area is correspondingly provided with a positioning component; the positioning assembly comprises a plurality of laser positioners; the laser positioners are arranged on the frame, are positioned around the positioning area and irradiate the middle area of the positioning area so as to position products placed in the middle area of the positioning area.

Optionally, the frame is provided with a plurality of mounting slots, and each laser positioner is fixed to one of the mounting slots.

Optionally, a fixing piece is arranged above the mounting groove, the fixing piece compresses the laser positioner, and the fixing piece is fixed on the frame through a fastening screw.

Optionally, a plurality of the laser positioners are arranged in a pairwise manner.

Optionally, a plurality of groups of positioning components are arranged on the frame.

Optionally, a connecting frame is arranged on the frame.

An insert mechanism having the above positioning mechanism.

Optionally, the device comprises a rack and a plurality of groups of plug-in devices arranged on the rack in a side-by-side manner; the plug-in device comprises an upper and lower driving assembly, a connecting rod, a plug-in seat, a first driving piece and two clamping pieces; the connecting rod is movably arranged on the rack and can move up and down relative to the rack, the plug-in seat is arranged at the lower end of the connecting rod, the first driving piece is arranged on the plug-in seat, the two clamping pieces are arranged on the first driving piece and are driven to be close to or far away from each other by the first driving piece, so that the two clamping pieces clamp or release the electronic element; the up-down driving component is arranged on the rack and is in transmission connection with the connecting rod so as to drive the connecting rod to move up and down; the frame is arranged on the rack, and each positioning component is arranged corresponding to one plug-in device; when the two clamping pieces clamp the electronic element to be placed in the middle area of the positioning area, the plurality of laser positioners irradiate pins of the electronic element to be positioned.

Optionally, the up-down driving assembly comprises a first driving wheel, a second driving wheel, a first driving belt, a first driving motor and a moving seat; the first driving wheel and the second driving wheel are both connected to the frame through a rotating shaft in a rotating way, the first driving wheel and the second driving wheel are arranged up and down, and the first driving belt is matched with the first driving wheel and the second driving wheel; the movable seat is vertically and slidably connected to the frame through a linear guide rail, and is fixedly connected with the first transmission belt; the upper end of the connecting rod is fixedly connected with the movable seat; the first driving motor is arranged on the frame, and a driving shaft of the first driving motor is fixedly connected with a rotating shaft of the first driving wheel.

Optionally, the frame is further provided with a rotary drive assembly; the rotary driving assembly comprises a third driving wheel, a fourth driving wheel, a second driving belt and a second driving motor; the center of the third driving wheel is rotationally connected with the frame through a connecting sleeve, the connecting rod penetrates through a sleeve hole of the connecting sleeve, and the connecting rod can move up and down along the sleeve hole; a circumferential limiting structure is arranged between the trepanning and the connecting rod so that the connecting rod can rotate along with the connecting sleeve; the second driving motor is arranged on the frame, the fourth driving wheel is arranged on the driving shaft of the second driving motor, and the second driving belt is matched with the third driving wheel and the fourth driving wheel.

Compared with the prior art, the positioning mechanism provided by the embodiment of the utility model has one or more of the following technical schemes:

the positioning mechanism is applied to, but not limited to, an interposer mechanism. The pins of the electronic element are placed in the middle area of the positioning area, laser is emitted by the plurality of laser positioners to irradiate the pins of the electronic element, and the pins of the electronic element are accurately positioned, so that the pins of the electronic element are accurately aligned with the conductive jacks of the circuit board, the pins of the electronic element can be accurately inserted into the conductive jacks of the circuit board, and the phenomenon of deflection and the like of the electronic element is avoided.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present utility model, the drawings that are needed in the embodiments or the description of the prior art will be briefly described below, it being obvious that the drawings in the following description are only some embodiments of the present utility model, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.

Fig. 1 is a schematic structural view of a positioning mechanism according to the present utility model.

Fig. 2 is another view of the positioning mechanism of the present utility model.

Fig. 3 is a schematic structural view of the card mechanism of the present utility model.

Fig. 4 is another view of the card mechanism of the present utility model.

Fig. 5 is a schematic partial structure of the card device of the present utility model.

Wherein, each reference sign in the figure:

100. a frame;

200. a plug-in device; 210. an up-down driving assembly; 211. a first driving wheel; 212. a second driving wheel; 213. a first belt; 214. a first driving motor; 215. a movable seat; 216. a linear guide rail; 220. a connecting rod; 230. a plug-in seat; 240. a first driving member; 241. a slide block; 250. a clamping member; 251. a clamping groove; 260. a positioning piece; 261. a positioning part; 262. a chute;

300. a rotary drive assembly; 310. a third driving wheel; 311. connecting sleeves; 312. trepanning; 320. a fourth driving wheel; 330. a second belt; 340. a second driving motor;

400. a positioning mechanism; 410. a frame; 411. a connecting frame; 412. a mounting groove; 420. a positioning area; 430. a positioning assembly; 431. a laser locator; 440. a fixing member; 441. a connection hole;

500. an electronic component.

Detailed Description

Embodiments of the present utility model are described in detail below, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to like or similar elements or elements having like or similar functions throughout. The embodiments described below by referring to the drawings are exemplary and intended to illustrate embodiments of the utility model and should not be construed as limiting the utility model.

In the description of the embodiments of the present utility model, it should be understood that the terms "length," "width," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like indicate orientations or positional relationships based on the orientation or positional relationships shown in the drawings, merely to facilitate description of the embodiments of the present utility model and simplify description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present utility model.

Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include one or more such feature. In the description of the embodiments of the present utility model, the meaning of "plurality" is two or more, unless explicitly defined otherwise.

In the embodiments of the present utility model, unless explicitly specified and limited otherwise, the terms "mounted," "connected," "secured" and the like are to be construed broadly and include, for example, either permanently connected, removably connected, or integrally formed; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communicated with the inside of two elements or the interaction relationship of the two elements. The specific meaning of the above terms in the embodiments of the present utility model will be understood by those of ordinary skill in the art according to specific circumstances.

In one embodiment of the present utility model, referring to fig. 1-5, a positioning mechanism is provided that includes a frame 410. At least one positioning area 420 is disposed in the frame 410, and each positioning area 420 is correspondingly provided with a positioning component 430; the positioning assembly 430 includes a plurality of laser positioners 431, wherein the plurality of laser positioners 431 are disposed on the frame 410, the plurality of laser positioners 431 are disposed around the positioning area 420, and the plurality of laser positioners 431 are directed toward the middle area of the positioning area 420 to position the product disposed in the middle area of the positioning area 420.

Wherein the positioning mechanism 400 is applied to, but not limited to, a card mechanism.

The laser locator 431 may be an infrared laser locator 431, and the infrared laser locator 431 is well known in the art, and how the infrared laser locator 431 locates is well known to those skilled in the art.

Compared with the prior art, the above technical solutions of the positioning mechanism 400 provided in the embodiments of the present utility model have at least one of the following technical effects:

referring to fig. 1, 2 and 3, the pins of the electronic component 500 are disposed in the middle area of the positioning area 420, and the pins of the electronic component 500 are precisely positioned by emitting laser to irradiate the pins of the electronic component through the plurality of laser positioners 431, so that the pins of the electronic component 500 are precisely aligned with the conductive jacks of the circuit board, and thus the pins of the electronic component 500 can be precisely inserted into the conductive jacks of the circuit board, and the phenomenon of skew of the electronic component 500 is avoided.

In addition, the plurality of laser positioners 431 emit laser from different directions to irradiate different settings of the pins of the electronic component, so that the position of the pins of the electronic component is detected by at least one laser positioner 431 only if the positions of the pins of the electronic component are slightly shifted, and the positioning precision is high.

When the positions of the pins of the electronic component clamped by the plug-in device 200 are shifted, the positions of the at least one laser positioner 431 irradiated on the electronic component are changed, and the positions of the pins of the electronic component can be adjusted by rotating the rotary driving assembly 300 of the plug-in device 200, so that the pins of the electronic component 500 are aligned with the conductive jacks of the circuit board again, and the plug-in accuracy is ensured.

Referring to fig. 1 and 2, the frame 410 is provided with a plurality of mounting slots 412, and each of the laser positioners 431 is fixed to one of the mounting slots 412 for easy installation.

Further, referring to fig. 1 and 2, a fixing member 440 is disposed above the mounting groove 412, the fixing member 440 presses the laser positioner 431, and the fixing member 440 is fixed to the frame 410 by a fastening screw, so that the mounting is firm.

Further, referring to fig. 1 and 2, the fixing member 440 is provided with a coupling hole 441 therethrough, and the fastening screw is screwed to the frame 410 through the coupling hole 441, thereby facilitating installation.

Preferably, referring to fig. 1 and 2, a plurality of the laser positioners 431 are disposed in a pair-by-pair relationship. Of course, in other embodiments, the plurality of laser positioners 431 may be disposed offset from each other, which is not limited herein.

In another embodiment of the present utility model, referring to fig. 3-5, there is also provided an insert mechanism having the positioning mechanism 400 described above.

Referring to fig. 3-5, the card mechanism includes a rack 100 and a plurality of sets of card devices 200 arranged side by side on the rack 100. The card assembly 200 includes an up-down driving assembly 210, a connection rod 220, a card holder 230, a first driving member 240, and two clamping members 250. The connecting rod 220 is movably disposed on the frame 100 and can move up and down relative to the frame 100, the plug-in seat 230 is disposed at the lower end of the connecting rod 220, the first driving member 240 is disposed on the plug-in seat 230, and the two clamping members 250 are disposed on the first driving member 240 and drive the two clamping members 250 to approach or separate from each other through the first driving member 240, so that the two clamping members 250 clamp or release the electronic component 500. The up-down driving assembly 210 is disposed on the frame 100 and is in transmission connection with the connecting rod 220, so as to drive the connecting rod 220 to move up and down, thereby driving the two clamping members 250 to move up and down.

Referring to fig. 3-5, in operation, the multiple groups of card devices 200 can perform card insertion operation, the electronic component 500 is clamped by the two clamping members 250, and then the up-down driving assembly 210 drives the two clamping members 250 to move down, so that pins of the electronic component 500 are inserted into electrical connection holes of the circuit board, thereby realizing card insertion operation. Therefore, the efficient plug-in mechanism performs plug-in operation through the plurality of groups of plug-in devices 200, greatly improves the plug-in efficiency, and is beneficial to mass production and processing.

Referring to fig. 3-5, a clamping groove 251 is formed on one side of each of the two clamping members 250, and the two clamping grooves 251 are respectively adapted to clamp two opposite sides of the electronic component 500 when they are close to each other, so as to position and clamp the electronic component 500 between the two clamping members 250, so as to stably clamp the electronic component 500.

Referring to fig. 3-5, the first driving member 240 is a finger cylinder, and the two clamping members 250 are respectively fixed to two fingers of the finger cylinder. The two fingers are driven to approach or separate from each other by the finger cylinder, so that the two clamping pieces 250 are driven to approach or separate from each other, and the structure is simple.

In another embodiment of the present utility model, referring to fig. 1, 2 and 3, the first driving member 240 is further provided with a positioning member 260, a positioning portion 261 is disposed at a lower end of the positioning member 260, the positioning portion 261 is located between the two clamping members 250, the positioning portion 261 is used for abutting against a top portion of the electronic component 500 clamped between the two clamping members 250, positioning the top portion of the electronic component 500, and then approaching to each other through the two clamping grooves 251 to clamp the electronic component 500.

Further, referring to fig. 3-5, the positioning member 260 is slidably connected to the first driving member 240, the positioning member 260 is provided with a connecting member, the connecting member is used for fixing or releasing the positioning member 260, and the positioning member 260 can move up and down relative to the first driving member 240 when releasing the fixing, so as to adjust the height position of the positioning portion 261 between the two clamping members 250, so as to adapt to electronic components 500 with different heights, and the practicability is very high.

Further, referring to fig. 3 to 5, the positioning member 260 is provided with at least one threaded hole therethrough, the connecting member is a screw, each threaded hole is adapted to be connected with one screw, when the positioning member 260 is fixed, the screw is screwed down, and the screw rod of the screw abuts against the first driving member 240. When the positioning piece 260 is released from being fixed, the screw is unscrewed, the screw rod of the screw is far away from the first driving piece 240, and the positioning piece 260 can be pushed to move up and down along the first driving piece 240 so as to adjust the height position of the positioning part 261 between the two clamping pieces 250, so that the structure is simple, and the operation is convenient.

Further, referring to fig. 3 to 5, the positioning member 260 is provided with a sliding groove 262, the first driving member 240 is provided with a sliding block 241, and the sliding block 241 is adapted to be slidably connected to the sliding groove 262, so that the positioning member 260 is slidably connected to the first driving member 240, which is simple in structure. Specifically, the chute 262 may be a "T" chute 262, and the slider 241 may be a "T" slider 241.

In another embodiment of the present utility model, referring to fig. 3 to 5, the up-down driving assembly 210 includes a first driving wheel 211, a second driving wheel 212, a first driving belt 213, a first driving motor 214, and a moving base 215. The first driving wheel 211 and the second driving wheel 212 are both connected to the frame 100 through a rotating shaft, the first driving wheel 211 and the second driving wheel 212 are arranged up and down, and the first driving belt 213 is adapted to be arranged on the first driving wheel 211 and the second driving wheel 212. The moving seat 215 is vertically and slidably connected to the frame 100 through a linear guide rail 216, and the moving seat 215 is fixedly connected to the first driving belt 213. The upper end of the connecting rod 220 is fixedly connected with the movable seat 215. The first driving motor 214 is disposed on the frame 100, and a driving shaft of the first driving motor 214 is fixedly connected with a rotating shaft of the first driving wheel 211. The first driving motor 214 drives the first driving wheel 211 to rotate, the first driving wheel 211 drives the first driving belt 213 to move, and the first driving wheel 211 drives the moving seat 215 to move up and down along the linear guide rail 216, so as to drive the two clamping pieces 250 to move up and down to clamp the electronic component 500 or plug in the electronic component 500. For example, the two clamping members 250 move up to the electronic component on the feeding device or the feeding fixing position and clamp the electronic component 500, and then the two clamping members 250 move down to insert the pins of the electronic component 500 into the electrical connection holes of the circuit board, so as to implement the inserting operation.

Further, the first driving wheel 211 and the second driving wheel 212 are synchronous pulleys, and correspondingly, the first driving belt 213 is a synchronous belt; alternatively, the first driving wheel 211 and the second driving wheel 212 are both sprockets, and correspondingly, the first driving belt 213 is a chain.

In another embodiment of the present utility model, referring to fig. 3-5, the housing 100 is further provided with a rotary drive assembly 300. The rotary drive assembly 300 includes a third drive wheel 310, a fourth drive wheel 320, a second drive belt 330, and a second drive motor 340. The center of the third driving wheel 310 is rotatably connected to the frame 100 through a connecting sleeve 311, the connecting rod 220 is inserted into a sleeve hole 312 of the connecting sleeve 311, and the connecting rod 220 can move up and down along the sleeve hole 312. A circumferential limiting structure is arranged between the sleeve hole 312 and the connecting rod 220, so that the connecting rod 220 can rotate along with the connecting sleeve 311. The second driving motor 340 is disposed on the frame 100, the fourth driving wheel 320 is disposed on a driving shaft of the second driving motor 340, and the second driving belt 330 is adapted to be disposed on the third driving wheel 310 and the fourth driving wheel 320. The second driving motor 340 drives the connecting rod 220 to rotate to drive the two clamping pieces 250 to rotate, so that the positions of the electronic components 500 clamped in the two clamping pieces 250 are adjusted, pins of the electronic components 500 can be inserted into jacks at different positions on the electronic components 500, the practicability is extremely high, and the performance of the plug-in machine is improved.

Further, the trepanning 312 is configured as a "D" shaped hole, the connecting rod 220 is configured as a "D" shaped rod, and the "D" shaped rod and the "D" shaped hole are adapted to form the circumferential limit structure, so that the connecting rod 220 can move up and down along the trepanning 312 of the connecting sleeve 311, and the connecting rod 220 can rotate along with the rotation of the connecting sleeve 311, with simple structure.

In other embodiments, the sleeve hole 312 is provided as a square hole, the connecting rod 220 is provided as a square rod, and the square rod and the square hole are matched to form the circumferential limit structure, so that the connecting rod 220 can move up and down along the sleeve hole 312 of the connecting sleeve 311, and the connecting rod 220 can rotate along with the rotation of the connecting sleeve 311, and the structure is simple.

Further, the third driving wheel 310 and the fourth driving wheel 320 are synchronous pulleys, and correspondingly, the second driving belt 330 is a synchronous belt; alternatively, the third and fourth drive wheels 310, 320 are sprockets, and correspondingly, the second drive belt 330 is a chain.

Referring to fig. 1, 2 and 3, a connection frame 411 is provided on the frame 410, and the frame 410 is disposed on the frame 100 through the connection frame 411, so that the frame 410 is convenient to install. The frame 410 is provided with a plurality of sets of positioning assemblies 430, and each positioning assembly 430 is disposed corresponding to one of the card devices 200. When the two clamping members 250 clamp the electronic component 500 to be placed in the middle area of the positioning area 420, the plurality of laser positioners 431 irradiate pins of the electronic component to be positioned; after the positioning is completed, the up-down driving assembly 210 drives the two clamping pieces 250 to drive the electronic components to move downwards for inserting, so that the pins of the electronic component 500 can be accurately inserted into the conductive jacks of the circuit board.

The rest of the present embodiment is the same as the first embodiment, and the unexplained features in the present embodiment are all explained by the first embodiment, and are not described here again.

The foregoing is a further detailed description of the utility model in connection with the preferred embodiments, and it is not intended that the utility model be limited to the specific embodiments described. For those skilled in the art, the architecture of the utility model can be flexible and changeable without departing from the concept of the utility model, and serial products can be derived. But a few simple derivatives or substitutions should be construed as falling within the scope of the utility model as defined by the appended claims.

Claims (10)

1. A positioning mechanism, comprising a frame; at least one positioning area is arranged in the frame, and each positioning area is correspondingly provided with a positioning component; the positioning assembly comprises a plurality of laser positioners; the laser positioners are arranged on the frame, are positioned around the positioning area and irradiate the middle area of the positioning area so as to position products placed in the middle area of the positioning area.

2. The positioning mechanism of claim 1, wherein: the frame is provided with a plurality of mounting grooves, and each laser positioner is fixed in one mounting groove.

3. The positioning mechanism of claim 2, wherein: a fixing piece is arranged above the mounting groove, the fixing piece presses the laser positioner, and the fixing piece is fixed on the frame through a fastening screw.

4. The positioning mechanism of claim 1, wherein: the plurality of laser positioners are arranged in a pairwise manner.

5. The positioning mechanism of claim 1, wherein: and a plurality of groups of positioning assemblies are arranged on the frame.

6. The positioning mechanism of claim 1, wherein: the frame is provided with a connecting frame.

7. An insert mechanism having a positioning mechanism as claimed in any one of claims 1 to 6.

8. The card mechanism of claim 7, wherein: comprises a rack and a plurality of groups of plug-in devices arranged on the rack in parallel; the plug-in device comprises an upper and lower driving assembly, a connecting rod, a plug-in seat, a first driving piece and two clamping pieces; the connecting rod is movably arranged on the rack and can move up and down relative to the rack, the plug-in seat is arranged at the lower end of the connecting rod, the first driving piece is arranged on the plug-in seat, the two clamping pieces are arranged on the first driving piece and are driven to be close to or far away from each other by the first driving piece, so that the two clamping pieces clamp or release the electronic element; the up-down driving component is arranged on the rack and is in transmission connection with the connecting rod so as to drive the connecting rod to move up and down; the frame is arranged on the rack, and each positioning component is arranged corresponding to one plug-in device; when the two clamping pieces clamp the electronic element to be placed in the middle area of the positioning area, the plurality of laser positioners irradiate pins of the electronic element to be positioned.

9. The card mechanism of claim 8, wherein: the upper and lower driving assembly comprises a first driving wheel, a second driving wheel, a first driving belt, a first driving motor and a moving seat; the first driving wheel and the second driving wheel are both connected to the frame through a rotating shaft in a rotating way, the first driving wheel and the second driving wheel are arranged up and down, and the first driving belt is matched with the first driving wheel and the second driving wheel; the movable seat is vertically and slidably connected to the frame through a linear guide rail, and is fixedly connected with the first transmission belt; the upper end of the connecting rod is fixedly connected with the movable seat; the first driving motor is arranged on the frame, and a driving shaft of the first driving motor is fixedly connected with a rotating shaft of the first driving wheel.

10. The card mechanism of claim 8, wherein: the rack is also provided with a rotary driving assembly; the rotary driving assembly comprises a third driving wheel, a fourth driving wheel, a second driving belt and a second driving motor; the center of the third driving wheel is rotationally connected with the frame through a connecting sleeve, the connecting rod penetrates through a sleeve hole of the connecting sleeve, and the connecting rod can move up and down along the sleeve hole; a circumferential limiting structure is arranged between the trepanning and the connecting rod so that the connecting rod can rotate along with the connecting sleeve; the second driving motor is arranged on the frame, the fourth driving wheel is arranged on the driving shaft of the second driving motor, and the second driving belt is matched with the third driving wheel and the fourth driving wheel.