CN219358687U - Clamping device - Google Patents

Abstract

The utility model provides a clamping device which is used for clamping a cutter with a fixing groove on the side wall and comprises a fixing seat and a fastening component. The fixing seat is provided with a mounting hole and a containing hole which are communicated, the mounting hole is used for containing a cutter, the bottom wall of the containing hole is provided with an air inlet hole which is communicated with the inside and the outside, the fastening assembly is arranged in the containing hole and comprises a limiting piece, a sliding piece and an elastic piece, two ends of the limiting piece are respectively propped against the side wall of the containing hole and the sliding piece, one end of the sliding piece is provided with a clearance groove, two ends of the elastic piece are respectively propped against the top wall of the containing hole and the other end of the sliding piece, the air inlet hole is used for introducing air to push the sliding piece to move, at least part of the limiting piece is contained in the clearance groove for the cutter to be installed in the mounting hole, and the elastic piece is used for driving the sliding piece to prop against the limiting piece to be clamped into the fixing groove after the air is withdrawn. According to the clamping device, the sliding part moves in the accommodating hole by introducing or withdrawing the gas in the accommodating hole, and the position of the limiting part relative to the mounting hole is adjusted, so that the efficiency of dismounting the cutter is improved.

Description

Clamping device

Technical Field

The utility model relates to the technical field of cutter fixing, in particular to a clamping device.

Background

When the numerical control machine tool processes the cutter, the cutter is required to be fixed firstly, the cutter is generally inserted into the mounting hole of the cutter holder when the cutter is fixed, and then the cutter holder is penetrated through a plurality of screw threads and abutted against the cutter, so that the cutter is fixed. However, in order to enable the tool to be smoothly placed into the tool holder, the inner diameter of the mounting hole in the tool holder is generally larger than the diameter of the tool, so that after the tool is placed into the tool holder, a plurality of screws are required to be adjusted repeatedly to align the tool with the central axis of the tool holder, the operation is complicated, the labor intensity is high, and the disassembly and assembly efficiency of the tool is low.

Disclosure of Invention

In view of the foregoing, it is desirable to provide a clamping device that improves the efficiency of tool removal.

The embodiment of the utility model provides a clamping device which is used for clamping a cutter, a fixing groove is formed in the side wall of the connecting end of the cutter, and the clamping device comprises:

the fixing seat is provided with a mounting hole and a containing hole which are communicated, the mounting hole is used for containing the connecting end of the cutter, and the bottom wall of the containing hole is provided with an air inlet hole so as to be communicated with the inside and the outside of the containing hole;

the fastening assembly is arranged in the accommodating hole and comprises a limiting piece, a sliding piece and an elastic piece, wherein two ends of the limiting piece respectively prop against the side wall of the accommodating hole and the sliding piece, one end of the sliding piece is provided with a clearance groove, and two ends of the elastic piece respectively prop against the top wall of the accommodating hole and the other end of the sliding piece; wherein, the liquid crystal display device comprises a liquid crystal display device,

the air inlet is used for introducing air to push the sliding piece to move towards the direction away from the air inlet, so that at least part of the limiting piece is accommodated in the avoidance groove, the connecting end of the cutter is installed in the mounting hole, and the elastic piece is used for driving the sliding piece to move towards the direction close to the air inlet after the air is withdrawn, so as to push the limiting piece to be clamped into the fixing groove of the cutter, and further clamp and fix the connecting end of the cutter.

When the clamping device works, air is introduced into the accommodating hole through the air inlet hole, the introduced air pushes the sliding part to move in the direction away from the air inlet hole, so that at least part of the limiting part is accommodated in the clearance groove on the sliding part, the mounting hole is provided with enough mounting space for the connecting end of the cutter to be installed in the mounting hole, at the moment, the elastic part is compressed, then, the air in the accommodating hole is withdrawn, the elastic part is released by the compressed elastic force, so as to push the sliding part to move in the direction close to the air inlet hole, the sliding part pushes the limiting part to protrude to the mounting hole to be clamped in the fixing groove of the cutter, and therefore, the installation of the cutter is completed. Therefore, the clamping device is simple in structure and convenient to operate, and the efficiency of tool disassembly is improved by introducing or withdrawing gas into the accommodating hole to enable the sliding part to move in the accommodating hole and adjusting the position of the limiting part relative to the mounting hole.

In some embodiments, the slider comprises:

the first sliding body is propped against the limiting piece, and one end of the first sliding body is provided with the clearance groove;

the second sliding body is connected with one end of the first sliding body, which is away from the avoidance groove, and the cross section area of the second sliding body is smaller than that of the first sliding body; wherein, the liquid crystal display device comprises a liquid crystal display device,

the elastic piece is sleeved on the second sliding body, and two ends of the elastic piece respectively support against the top wall of the accommodating hole and the second sliding body.

In some embodiments, the avoidance slot is disposed along a circumferential side of the slider and includes a first arc-shaped wall, a avoidance bottom wall, and a second arc-shaped wall that are sequentially connected.

In some embodiments, the mount comprises:

the fixing piece is provided with the mounting hole and an open accommodating groove;

the locking piece is in threaded connection with the opening end of the accommodating groove and abuts against one end of the elastic piece, and the accommodating hole is formed by surrounding the locking piece and the accommodating groove.

In some embodiments, the accommodating holes, the air inlet holes and the fastening components are all multiple, the accommodating holes are arranged at intervals along the circumferential direction of the mounting hole, each group of fastening components is arranged in one accommodating hole, and the air inlet hole is formed in the bottom wall of each accommodating hole.

In some embodiments, the mounting hole comprises a first mounting hole and a second mounting hole, the air inlets are communicated with the first mounting hole, the second mounting hole penetrates through the bottom wall of the first mounting hole and is communicated with the accommodating hole for accommodating the connecting end of the cutter, the fixing seat further comprises a sealing piece, the sealing piece is in threaded connection with the side wall of the first mounting hole, the sealing piece is provided with an air vent, and the air vent is communicated with the first mounting hole.

In some embodiments, the side wall of the accommodating hole is provided with an exhaust hole, and the exhaust hole penetrates through the side wall of the accommodating hole to communicate the inside and the outside of the accommodating hole.

In some embodiments, the clamping device further comprises:

the liquid spraying assembly is arranged on the fixing seat and used for spraying liquid to one end of the cutter, which is opposite to the connecting end.

In some embodiments, the fixing base is further provided with a liquid through hole and a liquid inlet hole, the liquid inlet hole is communicated with the liquid through hole and used for introducing liquid, the liquid spraying assembly comprises a fastener and a liquid spraying pipe, the fastener is sleeved on the liquid spraying pipe and is connected to the side wall of the liquid through hole in a threaded mode, one end of the liquid spraying pipe is communicated with the liquid inlet hole, and the other end of the liquid spraying pipe is located outside the mounting hole and used for spraying liquid to one end of the opposite connecting end in the cutter.

In some embodiments, the clamping device further comprises:

one end of the ventilation piece is communicated with the air inlet hole, and the other end of the ventilation piece is used for being communicated with an air source so as to introduce air to the air inlet hole.

Drawings

Fig. 1 is a schematic structural view of a cutter according to an embodiment of the present utility model.

Fig. 2 is an assembly schematic diagram of a cutter and a clamping device according to an embodiment of the present utility model.

Fig. 3 is a cross-sectional view of the tool and clamping device of fig. 2 taken along the direction iii-iii.

Fig. 4 is an exploded view of the clamping device of fig. 2.

Fig. 5 is a schematic structural view of the slider of fig. 4.

Fig. 6 is a cross-sectional view of the mount of fig. 3.

Description of the main reference signs

Tool 10

Fixing groove 10a

Connection terminal 11

Clamping device 20

Fixing seat 21

Mounting holes 21a

Receiving hole 21b

Air intake hole 21c

Accommodation groove 21d

First mounting hole 21e

Second mounting holes 21f

Exhaust hole 21g

Liquid through hole 21h

Liquid inlet 21m

Fixing member 211

Retaining member 212

Seal 213

Vent hole 213a

Fastening assembly 22

Limiting piece 221

Slider 222

Avoidance slot 222a

First curved wall 222b

Avoidance bottom wall 222c

Second arc wall 222d

First sliding body 2221

Second sliding body 2222

Elastic member 223

Spray assembly 23

Fastener 231

Hydrojet tube 232

Detailed Description

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

In the description of the present utility model, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings are merely for convenience in describing the present utility model and simplifying the description, and do not indicate or imply that the device or element 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 of the described features. In the description of the present utility model, the meaning of "a plurality" is two or more, unless explicitly defined otherwise.

In the description of the present utility model, 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 connected, electrically connected or can be communicated with each other; 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 present utility model can be understood by those of ordinary skill in the art according to the specific circumstances.

The embodiments of the present utility model will be described in detail below with reference to the accompanying drawings.

Referring to fig. 1, fig. 1 shows a tool 10 according to an embodiment of the present utility model, wherein a fixing groove 10a is formed on a side wall of a connecting end 11 of the tool 10, and the tool 10 may be a tool shank for mounting a tool bit, or may be an integral tool of a tool shank and a tool bit. In this embodiment, the cutter 10 is specifically a shank for mounting a cutter bit, specifically, the other end of the cutter 10 opposite to the connecting end 11 is used for mounting cutter bits of different types, and the fixing groove 10a is an annular groove.

Referring to fig. 2, an embodiment of the present utility model provides a clamping device 20 for clamping a tool 10, referring to fig. 3, the clamping device 20 includes a fixing base 21 and a fastening component 22, the fixing base 21 is used for being mounted on a numerical control machine, so that the numerical control machine can process the tool 10 clamped in the clamping device 20 by cutting, drilling, cutting, polishing, etc., and the processing position is one end of the tool 10 opposite to the connecting end 11, i.e. one end of the tool 10 protruding out of the mounting hole 21a after being fixed to the clamping device 20.

Referring to fig. 3 and fig. 4 together, in some embodiments, the fixing base 21 is provided with a mounting hole 21a and a receiving hole 21b, the mounting hole 21a is used for receiving the connecting end 11 of the tool 10, the bottom wall of the receiving hole 21b is provided with an air inlet 21c to communicate the inside and the outside of the receiving hole 21b, the fastening assembly 22 is disposed in the receiving hole 21b and comprises a limiting member 221, a sliding member 222 and an elastic member 223, two ends of the limiting member 221 respectively abut against a side wall of the receiving hole 21b and the sliding member 222, one end of the sliding member 222 is provided with a position avoiding groove 222a, and two ends of the elastic member 223 respectively abut against the top wall of the receiving hole 21b and the other end of the sliding member 222. The air inlet 21c is used for introducing air to push the sliding piece 222 to move in a direction away from the air inlet 21c, so that at least part of the limiting piece 221 is accommodated in the avoidance groove 222a for the cutter 10 to be installed in the installation hole 21a, the elastic piece 223 is used for driving the sliding piece 222 to move in a direction close to the air inlet 21c after removing air to push the limiting piece 221 to be clamped in the fixing groove 10a, and the air in the accommodation hole 21b can be extracted from the air inlet 21c or other positions arranged on the fixing seat 21 by an external mechanism in a mode of removing air. In this embodiment, the limiting member 221 may be a ball.

When the clamping device 20 is operated, the air is introduced into the accommodating hole 21b through the air inlet 21c, the introduced air pushes the sliding piece 222 to move in a direction away from the air inlet 21c, so that the limiting piece 221 is at least partially accommodated in the avoidance groove 222a on the sliding piece 222, the installation hole 21a has enough installation space for accommodating the cutter 10 in the installation hole 21a, at this time, the elastic piece 223 is compressed, then the air in the accommodating hole 21b is withdrawn, the elastic piece 223 is released by the compressed elastic force, so as to push the sliding piece 222 to move towards a direction close to the air inlet 21c, and the sliding piece 222 pushes the limiting piece 221 to protrude to the installation hole 21a so as to be clamped in the fixing groove 10a of the cutter 10, thereby completing the installation of the cutter 10. Therefore, the clamping device 20 can move the sliding member 222 in the accommodating hole 21b by ventilating or withdrawing the air into the accommodating hole 21b, and adjust the position of the limiting member 221 relative to the mounting hole 21a, so that the quick assembly and disassembly of the cutter 10 can be realized, the structure is simple, the operation is convenient, and the assembly and disassembly efficiency of the cutter 10 is improved.

Referring to fig. 4 and fig. 5, in some embodiments, the sliding member 222 includes a first sliding body 2221 and a second sliding body 2222. The first sliding body 2221 abuts against the limiting piece 221, the avoidance groove 222a is formed at one end of the first sliding body 2221, the second sliding body 2222 is connected with one end of the first sliding body 2221, which is away from the avoidance groove 222a, and the cross section area of the second sliding body 2222 is smaller than that of the first sliding body 2221. The elastic member 223 is sleeved on the second sliding body 2222, and two ends of the elastic member 223 respectively support the top wall of the accommodating hole 21b and the second sliding body 2222.

Therefore, the second sliding body 2222 can guide the elastic member 223 in the expansion and contraction direction, so as to avoid the shake of the elastic member 223 and improve the stability of the operation of the elastic member 223.

Referring to fig. 5, in some embodiments, the avoidance slot 222a is disposed along a circumferential side of the sliding member 222, and includes a first arc-shaped wall 222b, a avoidance bottom wall 222c, and a second arc-shaped wall 222d connected in sequence.

Therefore, the first arc wall 222b and the second arc wall 222d located at two sides of the avoidance bottom wall 222c can guide the limiting piece 221, so that the limiting piece 221 can be smoothly clamped to the avoidance groove 222a, and the stability of the clamping of the limiting piece 221 to the avoidance groove 222a is improved. In addition, the first arc wall 222b and the second arc wall 222d can reduce the damage of the limiting member 221 to the avoidance groove 222a in the clamping process, and prolong the service life of the sliding member 222.

Referring to fig. 3 and fig. 4, in some embodiments, the fixing base 21 includes a fixing member 211 and a locking member 212. The fixing member 211 is provided with a mounting hole 21a and an open accommodating groove 21d, the locking member 212 is in threaded connection with the open end of the accommodating groove 21d and abuts against one end of the elastic member 223, and the locking member 212 and the accommodating groove 21d enclose to form an accommodating hole 21b. Illustratively, retaining member 212 may be a countersunk bolt.

Therefore, the fastening assembly 22 can be quickly assembled and disassembled by disassembling the locking member 212, so that the assembly efficiency of the clamping device 20 is improved.

In some embodiments, the accommodating holes 21b, the air inlet holes 21c and the fastening components 22 are all multiple, the accommodating holes 21b are arranged at intervals along the circumferential direction of the mounting hole 21a, each group of fastening components 22 is arranged in one accommodating hole 21b, and the bottom wall of each accommodating hole 21b is provided with one air inlet hole 21c. In this embodiment, the number of the receiving holes 21b, the air intake holes 21c and the fastening members 22 is four.

As a result, the plurality of stoppers 221 can be held by the fixing groove 10a of the tool 10 on the circumferential side of the mounting hole 21a, thereby improving the uniformity of fixing the tool 10 and reducing the risk of tilting of the tool 10 to the mounting hole 21a.

Referring to fig. 4 and 6 together, in some embodiments, the mounting hole 21a includes a first mounting hole 21e and a second mounting hole 21f, the plurality of air intake holes 21c are communicated with the first mounting hole 21e, the second mounting hole 21f penetrates through the bottom wall of the first mounting hole 21e and is communicated with the receiving hole 21b for receiving the connecting end 11 of the tool 10, the fixing base 21 further includes a sealing member 213, the sealing member 213 is in threaded connection with the side wall of the first mounting hole 21e, the sealing member 213 is provided with an air vent 213a, and the air vent 213a is communicated with the first mounting hole 21e.

Therefore, the ventilation hole 213a can communicate with the plurality of air intake holes 21c through the first mounting hole 21e at the same time, and when the operation is performed, the air supply to the plurality of air intake holes 21c can be performed by introducing air into the ventilation hole 213a, so that the ventilation efficiency is improved, and the sealing member 213 can form a stopper for the tool inserted into the mounting hole 21a.

In some embodiments, the sidewall of the accommodating hole 21b is provided with an exhaust hole 21g, and the exhaust hole 21g penetrates the sidewall of the accommodating hole 21b to communicate the inside and outside of the accommodating hole 21b.

As such, the intake hole 21c and the exhaust hole 21g form passages for the intake and exhaust of gas, respectively, such as: the air intake hole 21c is connected to an air vent (for example, a booster pump), and the air exhaust hole 21g is connected to an air discharge member (an air suction pump), thereby improving the working efficiency of the clamping device 20.

Referring to fig. 2 and 4 together, in some embodiments, the holding device 20 further comprises a spray assembly 23. The spray assembly 23 is provided on the holder 21 for spraying a liquid to the tool 10 located outside the mounting hole 21a, i.e., the end of the tool 10 opposite to the connection end 11. Illustratively, the liquid may be water, a cleaning liquid, or the like.

Therefore, the liquid spraying assembly 23 can remove scraps generated in the machining process of one end of the cutter 10 opposite to the connecting end 11, and the machining efficiency of the cutter 10 is improved.

In some embodiments, the fixing base 21 is further provided with a liquid through hole 21h and a liquid inlet hole 21m, the liquid inlet hole 21m is communicated with the liquid through hole 21h for guiding in liquid, the liquid spraying component 23 comprises a fastener 231 and a liquid spraying pipe 232, the fastener 231 is sleeved on the liquid spraying pipe 232 and is connected to the side wall of the liquid through hole 21h in a threaded manner, one end of the liquid spraying pipe 232 is communicated with the liquid inlet hole 21m, and the other end of the liquid spraying pipe 232 is located outside the mounting hole 21a and is used for spraying liquid to one end of the cutter 10 opposite to the connecting end 11. Exemplary fasteners 231 may be hollow round tubes with threaded segments on the outside.

Therefore, the liquid spraying pipe 232 is detachably connected with the fixing seat 21 through the fastener 231, so that the liquid spraying assembly 23 is convenient to assemble, disassemble and replace, and the structure is simple and the manufacturing cost is low.

In some embodiments, the clamping device 20 further comprises a vent (not shown). One end of the ventilation piece is communicated with the air inlet hole 21c, and the other end of the ventilation piece is used for being communicated with an air source so as to introduce air into the air inlet hole 21c. Illustratively, the breather may be a booster pump.

The clamping device 20 operates as follows:

firstly, air is introduced into the plurality of air inlet holes 21c through the first mounting holes 21e by adopting the air vent, and the introduced air pushes the corresponding sliding piece 222 to move in a direction away from the air inlet holes 21c until at least part of the plurality of limiting pieces 221 are accommodated in the avoidance grooves 222a on the sliding piece 222, and at the moment, the plurality of elastic pieces 223 are compressed;

then, the cutter is inserted into the second mounting hole 21f, and the fixing groove 10a of the connecting end of the cutter 10 is made to correspond to the plurality of stopper pieces 221 in the radial direction of the second mounting hole 21 f;

finally, the exhaust member is used to draw out the air in the accommodating hole 21b from the air outlet 21g, and the plurality of elastic members 223 are released by the compressed elastic force to push the corresponding first sliding body 2221 to move towards the direction approaching the air inlet 21c, and push the limiting member 221 to protrude to the mounting hole 21a so as to be clamped in the fixing groove 10a of the connecting end 11 of the cutter 10.

It will be evident to those skilled in the art that the utility model is not limited to the details of the foregoing illustrative embodiments, and that the present utility model may be embodied in other specific forms without departing from the spirit or essential characteristics thereof. The present embodiments are, therefore, to be considered in all respects as illustrative and not restrictive, the scope of the utility model being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein.

Finally, it should be noted that the above-mentioned embodiments are merely for illustrating the technical solution of the present utility model and not for limiting the same, and although the present utility model has been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that modifications and equivalents may be made to the technical solution of the present utility model without departing from the spirit and scope of the technical solution of the present utility model.

Claims (10)

1. A clamping device for centre gripping cutter, fixed slot has been seted up to the lateral wall of the link of cutter, its characterized in that, clamping device includes:

the fixing seat is provided with a mounting hole and a containing hole which are communicated, the mounting hole is used for containing the connecting end of the cutter, and the bottom wall of the containing hole is provided with an air inlet hole so as to be communicated with the inside and the outside of the containing hole;

the fastening assembly is arranged in the accommodating hole and comprises a limiting piece, a sliding piece and an elastic piece, wherein two ends of the limiting piece respectively prop against the side wall of the accommodating hole and the sliding piece, one end of the sliding piece is provided with a clearance groove, and two ends of the elastic piece respectively prop against the top wall of the accommodating hole and the other end of the sliding piece; wherein, the liquid crystal display device comprises a liquid crystal display device,

the air inlet is used for introducing air to push the sliding piece to move towards the direction away from the air inlet, so that at least part of the limiting piece is accommodated in the avoidance groove, the connecting end of the cutter is installed in the mounting hole, and the elastic piece is used for driving the sliding piece to move towards the direction close to the air inlet after the air is withdrawn, so as to push the limiting piece to be clamped into the fixing groove of the cutter, and further clamp and fix the connecting end of the cutter.

2. The clamping device as recited in claim 1, wherein said slider comprises:

the first sliding body is propped against the limiting piece, and one end of the first sliding body is provided with the clearance groove;

the second sliding body is connected with one end of the first sliding body, which is away from the avoidance groove, and the cross section area of the second sliding body is smaller than that of the first sliding body; wherein, the liquid crystal display device comprises a liquid crystal display device,

the elastic piece is sleeved on the second sliding body, and two ends of the elastic piece respectively support against the top wall of the accommodating hole and the second sliding body.

3. The clamping device as claimed in claim 1, characterized in that,

the avoidance groove is arranged along the peripheral side of the sliding piece and comprises a first arc-shaped wall, a avoidance bottom wall and a second arc-shaped wall which are sequentially connected.

4. The clamping device of claim 1, wherein the holder comprises:

the fixing piece is provided with the mounting hole and an open accommodating groove;

the locking piece is in threaded connection with the opening end of the accommodating groove and abuts against one end of the elastic piece, and the accommodating hole is formed by surrounding the locking piece and the accommodating groove.

5. The clamping device as claimed in claim 1, characterized in that,

the accommodating holes, the air inlets and the fastening components are all multiple, the accommodating holes are arranged at intervals along the circumferential direction of the mounting hole, each group of fastening components are arranged in one accommodating hole, and the bottom wall of each accommodating hole is provided with one air inlet.

6. The clamping device as claimed in claim 5, characterized in that,

the mounting holes comprise a first mounting hole and a second mounting hole, the air inlet holes are communicated with the first mounting hole, and the second mounting hole penetrates through the bottom wall of the first mounting hole and is communicated with the accommodating hole for accommodating the connecting end of the cutter;

the fixing seat further comprises a sealing piece, the sealing piece is in threaded connection with the side wall of the first mounting hole, the sealing piece is provided with a vent hole, and the vent hole is communicated with the first mounting hole.

7. The clamping device as claimed in claim 1, characterized in that,

the side wall of the accommodating hole is provided with an exhaust hole, and the exhaust hole penetrates through the side wall of the accommodating hole to communicate the inside and the outside of the accommodating hole.

8. The clamping device as recited in claim 1, further comprising:

the liquid spraying assembly is arranged on the fixing seat and used for spraying liquid to one end of the cutter, which is opposite to the connecting end.

9. The clamping device as claimed in claim 8, characterized in that,

the fixing seat is also provided with a liquid through hole and a liquid inlet hole, and the liquid inlet hole is communicated with the liquid through hole and is used for introducing liquid;

the liquid spraying assembly comprises a fastener and a liquid spraying pipe, the fastener is sleeved on the liquid spraying pipe and is connected to the side wall of the liquid through hole in a threaded mode, one end of the liquid spraying pipe is communicated with the liquid inlet hole, the other end of the liquid spraying pipe is located outside the mounting hole and used for spraying liquid to one end of the opposite connecting end of the cutter.

10. The clamping device as recited in claim 1, further comprising:

one end of the ventilation piece is communicated with the air inlet hole, and the other end of the ventilation piece is used for being communicated with an air source so as to introduce air to the air inlet hole.