CN223383545U - V-CUT knife for electronic circuit board - Google Patents

Abstract

The utility model relates to the technical field of circuit board processing, in particular to an electronic circuit board V-CUT knife which can automatically clean cutting scraps on the surface of a circuit board when the circuit board is CUT, is convenient to use, reduces labor intensity and has high practicability, and comprises a bottom plate, a moving mechanism, a clamping mechanism, a lifting mechanism, a cutting mechanism and a cleaning mechanism, wherein the cutting mechanism is arranged on the lifting mechanism, the lifting mechanism is used for lifting the cutting mechanism, the clamping mechanism is arranged on the moving mechanism, the moving mechanism is used for moving the clamping mechanism, the clamping mechanism has the function of clamping and fixing, the cutting mechanism is arranged above the clamping mechanism, the cleaning mechanism is arranged on the bottom plate, and the cleaning mechanism has the function of cleaning.

Description

V-CUT knife for electronic circuit board

Technical Field

The utility model relates to the technical field of circuit board processing, in particular to a V-CUT knife for an electronic circuit board.

Background

The V-CUT knife is a device for grooving the circuit board, and is used for cutting a V-shaped groove on the circuit board when the circuit board is processed, and then a worker can gently break the circuit board along the V-shaped groove by breaking the circuit board, so that the processing of the circuit board is facilitated. In the prior art, the patent application number 201820365855.8 discloses a multi-cutter V-CUT machine which mainly comprises a blade fixing shaft, a plurality of V-CUT cutters, a cutting bed and the like, wherein when a circuit board is processed, the circuit board is placed on the cutting bed, then the plurality of V-CUT cutters are rotated through the blade fixing shaft, V-shaped grooves are CUT on the surface of the circuit board through the rotating V-CUT cutters, the inventor considers that the problem exists in the use process, cutting scraps generated in the process of cutting the circuit board can fall on the surface of the circuit board, when the circuit board is CUT, workers are required to manually clean scraps on the surface of the circuit board, the use is inconvenient, and the practicability is poor.

Disclosure of utility model

In order to solve the technical problems, the utility model provides the V-CUT knife for the electronic circuit board, which can automatically clean cutting scraps on the surface of the circuit board when the circuit board is CUT, is convenient to use, reduces labor intensity and has high practicability.

The V-CUT knife for the electronic circuit board comprises a bottom plate, a moving mechanism, a clamping mechanism, a lifting mechanism, a cutting mechanism and a cleaning mechanism, wherein the cutting mechanism is arranged on the lifting mechanism, the lifting mechanism is used for lifting the cutting mechanism, the clamping mechanism is arranged on the moving mechanism, the moving mechanism is used for moving the clamping mechanism, the clamping mechanism has the clamping and fixing functions, the cutting mechanism is arranged above the clamping mechanism, the cleaning mechanism is arranged on the bottom plate, the cleaning mechanism has the cleaning function, when the circuit board is CUT, the circuit board is clamped and fixed through the clamping mechanism, then the cutting mechanism is lowered through the lifting mechanism, the cutting mechanism is lowered to a height suitable for cutting the circuit board, then the clamping mechanism is used for driving the circuit board to move rightwards through the moving mechanism, the circuit board is contacted with the cutting mechanism in the rightward moving process, the CUT circuit board is enabled to CUT into a V-shaped groove on the circuit board, the CUT circuit board is enabled to move rightwards, the CUT fragments on the surface of the circuit board are enabled to be cleaned through the cleaning mechanism, the circuit board can be automatically cleaned, the circuit board surface can be CUT, the fragments are convenient to use, and the cleaning performance is high, and the cleaning performance is achieved.

Preferably, the moving mechanism comprises an electric sliding rail A and a sliding plate, wherein the electric sliding rail A is arranged at the upper end of the bottom plate, the sliding plate is arranged on the electric sliding rail A, the electric sliding rail A is used for moving the sliding plate left and right, the clamping mechanism is arranged at the upper end of the sliding plate, when the circuit board moves left and right, the electric sliding rail A is opened, the clamping mechanism is driven by the electric sliding rail A to move the circuit board in the left and right direction through the sliding plate, and the left and right movement of the circuit board is facilitated.

Preferably, the clamping mechanism comprises a support plate, a screw rod, two groups of clamping blocks and two groups of compression bolts, wherein the support plate is fixedly arranged at the upper end of the sliding plate, the screw rod is rotatably arranged on the support plate, the front part and the rear part of the screw rod are respectively provided with external threads with opposite screwing directions, the two groups of clamping blocks are respectively slidably arranged on the support plate, the two groups of clamping blocks are respectively screwed with the front part and the rear part of the screw rod, the two groups of compression bolts are respectively screwed at the upper parts of the two groups of clamping blocks, the lower ends of the two groups of compression bolts are respectively provided with a pressing plate, the lower ends of the two groups of compression bolts are respectively positioned at the outer sides of the two groups of clamping blocks, when the circuit board is placed at the upper end of the support plate, the screw rod is rotated, the two groups of clamping blocks are mutually close by the rotating screw rod, the two groups of compression bolts are respectively positioned below the two groups of compression bolts, the two groups of compression bolts are then rotated, the two groups of compression bolts are respectively lowered, the two groups of compression bolts are respectively driven to lower the pressing plates of the two groups of compression bolts, the circuit board are respectively, the two groups of compression bolts are pressed, the pressing plates are respectively, the lower, the pressing plates of the two groups of compression bolts are respectively, and the compression bolts are respectively, the two groups of compression bolts are positioned at the lower, and the lower ends of the compression bolts, and the compression bolts are respectively.

The lifting mechanism comprises a lifting frame, a hydraulic cylinder A, a push rod and a sliding rod, wherein the hydraulic cylinder A is fixedly arranged at the upper end of the lifting frame, the push rod and the sliding rod are both arranged on the lifting frame in a vertical sliding mode, the upper end of the push rod is connected with the output end of the hydraulic cylinder A, the cutting mechanism is fixedly arranged at the lower ends of the push rod and the sliding rod, the lifting frame is fixedly lifted on a bracket of a workshop, when a circuit board is cut, the hydraulic cylinder A is opened, the hydraulic cylinder A enables the cutting mechanism to adjust the height through the push rod until the cutting mechanism is adjusted to be suitable for cutting the height of the circuit board, then the circuit board is enabled to move rightwards, and the V-shaped groove can be cut by the cutting mechanism.

Preferably, the cutting mechanism comprises a supporting frame, a motor, a driving shaft, a plurality of V-shaped pit knives and a plurality of connecting mechanisms, wherein the supporting frame is fixedly arranged at the lower ends of a sliding rod and a pushing rod, the motor is fixedly arranged on the supporting frame, the driving shaft is rotatably arranged on the supporting frame, the input end of the driving shaft is connected with the output end of the motor, the plurality of V-shaped pit knives are respectively arranged on the driving shaft through the plurality of connecting mechanisms, the connecting mechanisms are used for connecting the V-shaped pit knives with the driving shaft, when a circuit board is cut, the motor is turned on, the plurality of V-shaped pit knives rotate through the driving shaft, and when the circuit board passes through the lower parts of the plurality of V-shaped pit knives, the plurality of V-shaped grooves can be cut out on the circuit board at the same time, and the use is convenient.

The connecting mechanism comprises a connecting plate and a fastening bolt, wherein the V-shaped hole cutter is provided with a sliding groove, the driving shaft is provided with the sliding groove, the sliding groove on the V-shaped hole cutter is connected with the sliding rail on the driving shaft in a front-back sliding mode, the driving shaft is provided with a plurality of internal threaded holes, the connecting plate is fixedly arranged on the V-shaped hole cutter, the connecting plate is provided with a through hole, the fastening bolt penetrates through the through hole of the connecting plate and then is screwed with the internal threaded holes on the driving shaft, when the V-shaped hole cutters are arranged, the fastening bolt penetrates through the connecting plate on the V-shaped hole cutter and then is screwed with the internal threaded holes on the driving shaft, corresponding positions on the driving shaft, then the V-shaped hole cutters are fixed on the driving shaft.

Preferably, the cleaning mechanism comprises a fixed frame, a hydraulic cylinder B, a movable rod, an electric sliding rail B, a sliding block, a dust collection pipe, a hose and a dust collector, wherein the fixed frame is fixedly arranged on a bottom plate, the hydraulic cylinder B is fixedly arranged at the upper end of the fixed frame, the movable rod is vertically and slidably arranged at the upper part of the fixed frame, the upper end of the movable rod is connected with the output end of the hydraulic cylinder B, the electric sliding rail B is fixedly arranged at the lower end of the movable rod, the sliding block is arranged on the electric sliding rail B, the electric sliding rail B is used for moving the sliding block back and forth, the dust collection pipe is fixedly arranged at the lower end of the sliding block, the input end of the dust collection pipe is communicated with the dust collector through a hose, after the circuit board is cut, the circuit board is moved to the lower part of the dust collection pipe, the hydraulic cylinder B is opened, the electric sliding rail B drives the sliding block and the dust collection pipe to descend through the movable rod, the distance between the dust collection pipe and the circuit board is a proper distance, then the dust collector is opened, the chips at the upper end of the circuit board enter the dust collector through the dust collection pipe and the hose, and meanwhile the electric sliding rail B is opened, the dust collection pipe is used for driving the sliding block to move back and forth, and the dust collection pipe can be cleaned thoroughly, and cleaned.

Compared with the prior art, the automatic cutting machine has the beneficial effects that cutting scraps on the surface of the circuit board can be automatically cleaned when the circuit board is cut, the use is convenient, the labor intensity is reduced, and the practicability is high.

Drawings

FIG. 1 is a schematic view of a first axial structure of the present utility model;

FIG. 2 is a schematic view of a second axial structure of the present utility model;

FIG. 3 is a schematic view of the structure of the clamping mechanism;

FIG. 4 is a schematic view of the cutting mechanism and the lifting mechanism;

Fig. 5 is a schematic view of the structure of the drive shaft, motor, connection plate, etc.;

FIG. 6 is a schematic structural view of a cleaning mechanism;

fig. 7 is a schematic view of the structure of the suction pipe, hose, cleaner, etc.

The drawing comprises 1, a bottom plate, 2, an electric sliding rail A, 3, a sliding plate, 4, a support plate, 5, a screw rod, 6, a clamping block, 7, a compression bolt, 8, a lifting frame, 9, a hydraulic cylinder A, 10, a push rod, 11, a sliding rod, 12, a supporting frame, 13, a motor, 14, a driving shaft, 15, a V pit knife, 16, a connecting plate, 17, a fastening bolt, 18, a fixed frame, 19, a hydraulic cylinder B, 20, a moving rod, 21, an electric sliding rail B, 22, a sliding block, 23, a dust suction pipe, 24, a hose, 25, a dust collector, 26 and a circuit board.

Detailed Description

In order that the utility model may be readily understood, a more complete description of the utility model will be rendered by reference to the appended drawings. This utility model may be embodied in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.

Example 1

As shown in fig. 1 to 7, the electronic circuit board V-cut knife of the present utility model comprises a base plate 1, a moving mechanism, a clamping mechanism, a lifting mechanism, a cutting mechanism and a cleaning mechanism, wherein the cutting mechanism is mounted on the lifting mechanism, the lifting mechanism is used for lifting the cutting mechanism, the clamping mechanism is mounted on the moving mechanism, the moving mechanism is used for moving the clamping mechanism, the clamping mechanism has a clamping and fixing function, the cutting mechanism is positioned above the clamping mechanism, the cleaning mechanism is mounted on the base plate 1, the cleaning mechanism has a cleaning function, when the circuit board 26 is cut, the circuit board 26 is clamped and fixed by the clamping mechanism, then the cutting mechanism is lowered by the lifting mechanism, the cutting mechanism is lowered to a height suitable for cutting the circuit board 26, then the clamping mechanism is driven by the moving mechanism to move the circuit board 26 rightward, the circuit board 26 is contacted with the cutting mechanism in the rightward moving process, the cutting mechanism cuts a bar-shaped V-shaped groove on the circuit board 26, the cut circuit board 26 is continuously moved rightward to the lower side of the cleaning mechanism, the cleaning mechanism is automatically cleaned by the cleaning mechanism, and the cutting of the surface of the circuit board 26 can be cleaned automatically, and the cutting mechanism can clean the surface of the circuit board 26 automatically, and the cutting mechanism has high practical strength.

As shown in FIG. 1, the moving mechanism comprises an electric slide rail A2 and a sliding plate 3, wherein the electric slide rail A2 is arranged at the upper end of a bottom plate 1, the sliding plate 3 is arranged on the electric slide rail A2, the electric slide rail A2 is used for moving the sliding plate 3 left and right, the clamping mechanism is arranged at the upper end of the sliding plate 3, when the circuit board 26 moves left and right, the electric slide rail A2 is opened, the electric slide rail A2 drives the clamping mechanism to drive the circuit board 26 to move left and right through the sliding plate 3, and the left and right movement of the circuit board 26 is facilitated.

As shown in figures 1 and 3, the clamping mechanism comprises a support plate 4, a lead screw 5, two groups of clamping blocks 6 and two groups of compression bolts 7, wherein the support plate 4 is fixedly arranged at the upper end of the sliding plate 3, the lead screw 5 is rotatably arranged on the support plate 4, the front part and the rear part of the lead screw 5 are respectively provided with external threads with opposite rotation directions, the two groups of clamping blocks 6 are respectively arranged on the support plate 4 in a sliding manner, the two groups of clamping blocks 6 are respectively screwed with the front part and the rear part of the lead screw 5, the two groups of compression bolts 7 are respectively screwed at the upper parts of the two groups of clamping blocks 6, the lower ends of the two groups of compression bolts 7 are respectively provided with a pressing plate, the lower ends of the two groups of compression bolts 7 are respectively positioned at the outer sides of the two groups of clamping blocks 6, when the circuit board 26 is placed at the upper end of the support plate 4, the lead screw 5 is rotated to enable the two groups of clamping blocks 6 to be mutually close to each other, the two groups of compression bolts 7 are further driven to be mutually close, the front part and the rear part of the circuit board 26 are respectively positioned below the two groups of compression bolts 7, the two groups of compression bolts 7 are then rotated to enable the two groups of compression bolts 7 to be respectively lowered, the two groups of compression bolts 7 are respectively screwed down, the lower than the two groups of compression bolts 7 are further driven to be respectively arranged at the lower ends of the two groups of compression bolts 7, the lower ends of the circuit board 26, and the compression bolts are fixed in the process, and the stability is improved.

As shown in figures 1 and 4, the lifting mechanism comprises a lifting frame 8, a hydraulic cylinder A9, a push rod 10 and a sliding rod 11, wherein the hydraulic cylinder A9 is fixedly arranged at the upper end of the lifting frame 8, the push rod 10 and the sliding rod 11 are both arranged on the lifting frame 8 in a vertical sliding mode, the upper end of the push rod 10 is connected with the output end of the hydraulic cylinder A9, the cutting mechanism is fixedly arranged at the lower ends of the push rod 10 and the sliding rod 11, the lifting frame 8 is fixedly lifted on a bracket of a workshop, when a circuit board 26 is cut, the hydraulic cylinder A9 is opened, the hydraulic cylinder A9 enables the cutting mechanism to adjust the height through the push rod 10 until the cutting mechanism is adjusted to be suitable for cutting the circuit board 26, then the circuit board 26 is enabled to move rightwards, and the circuit board 26 can be cut into V-shaped grooves with different depths according to the circuit boards with different thicknesses.

Referring to fig. 4, the cutting mechanism comprises a frame 12, a motor 13, a driving shaft 14, a plurality of V-shaped hole cutters 15 and a plurality of connecting mechanisms, wherein the frame 12 is fixedly arranged at the lower ends of the sliding rod 11 and the push rod 10, the motor 13 is fixedly arranged on the frame 12, the driving shaft 14 is rotatably arranged on the frame 12, the input end of the driving shaft 14 is connected with the output end of the motor 13, the plurality of V-shaped hole cutters 15 are respectively arranged on the driving shaft 14 through the plurality of connecting mechanisms, the connecting mechanisms are used for connecting the V-shaped hole cutters 15 with the driving shaft 14, when the circuit board 26 is cut, the motor 13 is turned on to enable the plurality of V-shaped hole cutters 15 to rotate through the driving shaft 14, and when the circuit board 26 passes through the lower parts of the plurality of V-shaped hole cutters 15, the rotated V-shaped hole cutters 15 cut out V-shaped grooves on the upper part of the circuit board 26 at the same time, and the use is convenient.

As shown in fig. 4 and 5, the connecting mechanism comprises a connecting plate 16 and a fastening bolt 17, wherein the V-hole knife 15 is provided with a sliding groove, the driving shaft 14 is provided with a sliding groove, the sliding groove on the V-hole knife 15 is connected with the sliding rail on the driving shaft 14 in a front-back sliding manner, the driving shaft 14 is provided with a plurality of internal threaded holes, the connecting plate 16 is fixedly arranged on the V-hole knife 15, the connecting plate 16 is provided with a through hole, the fastening bolt 17 passes through the through hole of the connecting plate 16 and then is screwed with the internal threaded holes on the driving shaft 14, after the V-hole knife 15 is slid to a designated position on the driving shaft 14, the fastening bolt 17 passes through the connecting plate 16 on the V-hole knife 15 and then is screwed with the internal threaded holes on the driving shaft 14, so that the V-hole knife 15 is fixed on the driving shaft 14, and as the V-hole knife 15 is detachably connected with the driving shaft 14, the V-hole knife 15 can slide on the driving shaft 14, the spacing between the V-hole knives 15 on the driving shaft 14 can be adjusted, and when the V-hole knives 15 are arranged on the driving shaft 14, the V-hole knife 15 can be cut into different V-grooves on the circuit board, and the practicability is high.

Referring to fig. 1, 6 and 7, the cleaning mechanism comprises a fixed frame 18, a hydraulic cylinder B19, a moving rod 20, an electric sliding rail B21, a sliding block 22, a dust collection pipe 23, a hose 24 and a dust collector 25, wherein the fixed frame 18 is fixedly arranged on a base plate 1, the hydraulic cylinder B19 is fixedly arranged at the upper end of the fixed frame 18, the moving rod 20 is arranged at the upper part of the fixed frame 18 in a sliding manner, the upper end of the moving rod 20 is connected with the output end of the hydraulic cylinder B19, the electric sliding rail B21 is fixedly arranged at the lower end of the moving rod 20, the sliding block 22 is arranged on the electric sliding rail B21, the electric sliding rail B21 is used for moving the sliding block 22 forwards and backwards, the dust collection pipe 23 is fixedly arranged at the lower end of the sliding block 22, the input end of the dust collection pipe 23 is communicated with the dust collector 25 through the hose 24, after the circuit board 26 is cut, the circuit board 26 is moved to the lower part of the dust collection pipe 23, the hydraulic cylinder B19 is opened, the electric sliding rail B21 drives the sliding block 22 and the dust collection pipe 23 to descend through the moving rod 20, the sliding block 22 is driven by the sliding rail B21 to the circuit board 26 to the output end of the hydraulic cylinder B19, the electric sliding block 23 is driven by the sliding block 22 to the electric sliding block 22, the electric sliding block 23 is driven by the electric sliding block 23 to the electric sliding block 26 is driven by the electric sliding block 26 to move the electric sliding block is driven by the electric sliding block 23, and the electric sliding block 23 is driven by the electric sliding block 23, the electric sliding block is driven by the electric sliding B is driven by the electric B is driven to be moved.

Example 2

The clamping mechanism may also be a flat nose pliers based on embodiment 1, and the clamping of the circuit board 26 may also be achieved.

The electric slide rail A2, the lifting frame 8, the V pit knife 15 and the dust collector 25 of the V-CUT knife of the electronic circuit board are all purchased in the market, and a person skilled in the art only needs to install and operate according to the attached use instruction without creative labor of the person skilled in the art.

The foregoing is merely a preferred embodiment of the present utility model, and it should be noted that it will be apparent to those skilled in the art that modifications and variations can be made without departing from the technical principles of the present utility model, and these modifications and variations should also be regarded as the scope of the utility model.

Claims (7)

1. The V-CUT knife for the electronic circuit board comprises a bottom plate (1) and is characterized by further comprising a moving mechanism, a clamping mechanism, a lifting mechanism, a cutting mechanism and a cleaning mechanism, wherein the cutting mechanism is arranged on the lifting mechanism, the lifting mechanism is used for lifting the cutting mechanism, the clamping mechanism is arranged on the moving mechanism, the moving mechanism is used for moving the clamping mechanism, the clamping mechanism has a clamping and fixing function, the cutting mechanism is arranged above the clamping mechanism, the cleaning mechanism is arranged on the bottom plate (1), and the cleaning mechanism has a cleaning function.

2. The electronic circuit board V-CUT tool according to claim 1, wherein the moving mechanism comprises an electric slide rail a (2) and a sliding plate (3), the electric slide rail a (2) is mounted at the upper end of the base plate (1), the sliding plate (3) is mounted on the electric slide rail a (2), the electric slide rail a (2) is used for moving the sliding plate (3) left and right, and the clamping mechanism is mounted at the upper end of the sliding plate (3).

3. The V-CUT tool for electronic circuit boards according to claim 2, wherein the clamping mechanism comprises a support plate (4), a screw rod (5), two groups of clamping blocks (6) and two groups of compression bolts (7), the support plate (4) is fixedly installed at the upper end of the sliding plate (3), the screw rod (5) is rotatably installed on the support plate (4), the front part and the rear part of the screw rod (5) are respectively provided with external threads with opposite rotation directions, the two groups of clamping blocks (6) are respectively installed on the support plate (4) in a front sliding mode and the rear sliding mode, the two groups of clamping blocks (6) are respectively screwed with the front part and the rear part of the screw rod (5), the two groups of compression bolts (7) are respectively screwed at the upper parts of the two groups of clamping blocks (6), the lower ends of the two groups of compression bolts (7) are respectively provided with a pressing plate, and the lower ends of the two groups of compression bolts (7) are respectively located at the outer sides of the two groups of clamping blocks (6).

4. The electronic circuit board V-CUT knife according to claim 1, wherein the lifting mechanism comprises a lifting frame (8), a hydraulic cylinder a (9), a push rod (10) and a sliding rod (11), the hydraulic cylinder a (9) is fixedly installed at the upper end of the lifting frame (8), the push rod (10) and the sliding rod (11) are both vertically and slidably installed on the lifting frame (8), the upper end of the push rod (10) is connected with the output end of the hydraulic cylinder a (9), and the cutting mechanism is fixedly installed at the lower ends of the push rod (10) and the sliding rod (11).

5. The V-CUT knife for electronic circuit board according to claim 4, wherein the cutting mechanism comprises a frame (12), a motor (13), a driving shaft (14), a plurality of V-shaped hole cutters (15) and a plurality of connecting mechanisms, the frame (12) is fixedly installed at the lower ends of the sliding rod (11) and the pushing rod (10), the motor (13) is fixedly installed on the frame (12), the driving shaft (14) is rotatably installed on the frame (12), the input end of the driving shaft (14) is connected with the output end of the motor (13), the plurality of V-shaped hole cutters (15) are installed on the driving shaft (14) through the plurality of connecting mechanisms, and the connecting mechanisms are used for connecting the V-shaped hole cutters (15) with the driving shaft (14).

6. The electronic circuit board V-CUT tool according to claim 5, wherein the connecting mechanism comprises a connecting plate (16) and a fastening bolt (17), a chute is arranged on the V-pit tool (15), a chute is arranged on the driving shaft (14), the chute on the V-pit tool (15) is connected with the sliding rail on the driving shaft (14) in a front-back sliding manner, a plurality of internal threaded holes are arranged on the driving shaft (14), the connecting plate (16) is fixedly arranged on the V-pit tool (15), a through hole is arranged on the connecting plate (16), and the fastening bolt (17) is screwed with the internal threaded holes on the driving shaft (14) after penetrating through the through hole of the connecting plate (16).

7. The electronic circuit board V-CUT tool according to claim 1, wherein the cleaning mechanism comprises a fixed frame (18), a hydraulic cylinder B (19), a movable rod (20), an electric sliding rail B (21), a sliding block (22), a dust collection tube (23), a hose (24) and a dust collector (25), the fixed frame (18) is fixedly installed on the bottom plate (1), the hydraulic cylinder B (19) is fixedly installed at the upper end of the fixed frame (18), the movable rod (20) is installed at the upper part of the fixed frame (18) in a sliding manner up and down, the upper end of the movable rod (20) is connected with the output end of the hydraulic cylinder B (19), the electric sliding rail B (21) is fixedly installed at the lower end of the movable rod (20), the sliding block (22) is installed on the electric sliding rail B (21), the electric sliding rail B (21) is used for moving the sliding block (22) forwards and backwards, the dust collection tube (23) is fixedly installed at the lower end of the sliding block (22), and the input end of the dust collection tube (23) is communicated with the dust collector (25) through the hose (24).