CN114042991A

CN114042991A - Copper pipe cutting machine

Info

Publication number: CN114042991A
Application number: CN202111493786.1A
Authority: CN
Inventors: 刘雄
Original assignee: Foshan Huize Heat Exchanger Equipment Co ltd
Current assignee: Foshan Huize Heat Exchanger Equipment Co ltd
Priority date: 2021-12-08
Filing date: 2021-12-08
Publication date: 2022-02-15
Anticipated expiration: 2041-12-08
Also published as: CN114042991B

Abstract

The application discloses a copper pipe cutting machine, which belongs to the technical field of cutting and comprises a rack, wherein a main shaft is rotatably connected to the rack, and a through hole for a pipe to pass through is formed in the axis position of the main shaft; the end face of the tool apron is fixedly connected with the end face of the main shaft, the axis of the tool apron is provided with a through hole, the through hole is over against the through hole, the end face of the tool apron, far away from the main shaft, is provided with a plurality of sliding chutes, the sliding chutes are arranged at equal intervals along the circumferential direction of the through hole, the sliding chutes extend along the radial direction of the tool apron, sliding blocks are connected in the sliding chutes in a sliding manner, one sliding block is fixed with a blade, and the rest sliding blocks are provided with riding wheels; the driving mechanism is used for driving the main shaft to rotate and is fixedly connected with the rack; and the contraction mechanism is used for driving the sliding block to slide towards the direction of the through hole in the sliding groove and is fixedly connected with the rack. This application has can high-efficiently cut the copper pipe, and can solve the problem that the mouth of pipe warp and burr are big when cutting.

Description

Copper pipe cutting machine

Technical Field

The application relates to the technical field of cutting, in particular to a copper pipe cutting machine.

Background

Copper tubes are also called copper tubes, have good electrical conductivity and thermal conductivity, and are the main materials of conductive fittings and heat dissipation fittings of electronic products.

In the related art, a pipe cutting machine is generally adopted for cutting large-diameter pipes; because the pipe diameter of the copper pipe is small, the pipe cutting machine cannot be suitable for cutting and processing the small-pipe-diameter copper pipe due to the problems of clamping and cutting, and therefore, the copper pipe with the small pipe diameter is generally cut by operating a saw blade type cutting machine by workers. During cutting, a worker presses down the saw blade type cutting machine, and the saw blade type cutting machine cuts the copper pipe from one side.

With respect to the related art among the above, the inventors consider that the following drawbacks exist: in the cutting process, the problem that the pipe orifice is deformed and burrs are large easily occurs to the copper pipe.

Disclosure of Invention

In order to improve the problem that the mouth of pipe warp, the burr is big among the cutting process, this application provides a copper pipe cutting machine.

The application provides a copper pipe cutting machine adopts following technical scheme:

a copper pipe cutting machine comprising:

the pipe fitting machine comprises a machine frame, wherein a main shaft is rotatably connected to the machine frame, and a through hole for a pipe to pass through is formed in the axis position of the main shaft;

the end face of the tool apron is fixedly connected with the end face of the main shaft, the axis of the tool apron is provided with a through hole, the through hole is over against the through hole, the end face of the tool apron, far away from the main shaft, is provided with a plurality of sliding chutes, the sliding chutes are arranged at equal intervals along the circumferential direction of the through hole, the sliding chutes extend along the radial direction of the tool apron, sliding blocks are connected in the sliding chutes in a sliding manner, one sliding block is fixed with a blade, and the rest sliding blocks are provided with riding wheels;

the driving mechanism is used for driving the main shaft to rotate and is fixedly connected with the rack;

and the contraction mechanism is used for driving the sliding block to slide towards the direction of the through hole in the sliding groove and is fixedly connected with the rack.

Through adopting above-mentioned technical scheme, the copper pipe passes from the through-hole of main shaft and the through-hole of blade holder, and the frame provides the support for the copper pipe, and through-hole can be fixed a position the copper pipe. The contraction mechanism drives the sliding block to slide towards the direction of the through hole in the sliding groove, the blade and the supporting wheel are folded towards the direction of the through hole, the blade is in contact with and extrudes the copper pipe, the supporting wheel supports the copper pipe, meanwhile, the driving mechanism drives the main shaft to rotate, the main shaft drives the cutter holder to rotate, and the blade performs rotary cutting on the copper pipe. In the rotary cutting process, the blade has pressure to all points on the periphery of the copper pipe, the stress is uniform, and the deformation of the pipe orifice can be effectively improved. The blade can cut each point on the global of copper pipe, can improve the big problem of burr. The copper pipe penetrates through the through hole and the through hole, the copper pipe has certain length and weight, and when the driving mechanism drives the cutter holder to rotate at a high speed, the copper pipe cannot rotate at a high speed along with the copper pipe, so that the cutter blade can cut the copper pipe.

Preferably, the drive mechanism includes:

the driving wheel is sleeved on the main shaft and is fixedly connected with the main shaft;

and the driving motor is fixedly connected with the rack, and an output shaft of the driving motor is connected with the driving wheel.

Through adopting above-mentioned technical scheme, start driving motor, driving motor's output shaft drives the drive wheel and rotates, and the drive wheel drives the main shaft and rotates simple and practical.

Preferably, the retracting mechanism includes:

the sleeve is sleeved on the cutter holder, and the sleeve and the cutter holder are arranged coaxially;

the driving piece is used for driving the sleeve to move along the direction parallel to the axis of the tool apron and is fixedly connected with the rack;

one end of the sliding block extends out of the peripheral surface of the tool apron, the end face of the end portion of the sliding block is an inclined plane, and the sleeve is used for driving the inclined plane to enable the sliding block to slide towards the direction of the through hole in the sliding groove.

Through adopting above-mentioned technical scheme, driving piece drive sleeve removes along the parallel direction of blade holder axis, and the sleeve can contact the inclined plane, through the cooperation of sleeve and inclined plane, makes the slider can slide to the through-hole direction in the spout.

Preferably, the driving part adopts a cylinder, the cylinder is fixedly connected with the rack, the telescopic direction of a piston rod of the cylinder is parallel to the axis direction of the cutter holder, a connecting rod is arranged on the piston rod of the cylinder, and one end of the connecting rod, far away from the cylinder, is fixedly connected with the sleeve.

Through adopting above-mentioned technical scheme, start the cylinder, the piston rod of cylinder is flexible, and the piston rod passes through the connecting rod and drives the sleeve at the axis direction round trip movement of blade holder.

Preferably, the rack is provided with a limiting rod, the end part of the limiting rod is provided with a limiting block, the limiting block is opposite to the piston rod of the air cylinder, and a distance is reserved between the limiting block and the end part of the piston rod, so that the sleeve can drive the inclined plane.

Through adopting above-mentioned technical scheme, after the piston rod of cylinder extended the stroke of predetermineeing, the piston rod touched the stopper, and the stopper blocks the piston rod to reduce the inertia of piston rod and to the influence of stroke, can carry out accurate restriction to the stroke of piston rod.

Preferably, a connecting piece is arranged on the rack and located below the air cylinder, a guide groove is formed in the connecting piece, the extending direction of the guide groove is parallel to the axis direction of the cutter holder, and the connecting rod is connected with the guide groove in a sliding mode.

Through adopting above-mentioned technical scheme, the piston rod of cylinder is flexible, and the connecting rod slides in the guide way, and the guide way can lead to the connecting rod, makes telescopic removal more accurate.

Preferably, an elastic part is arranged at a position, close to the through hole, in the sliding groove, one side, far away from the through hole, of the elastic part is connected with the sliding block, and the elastic part is used for enabling the sliding block to reset.

Through adopting above-mentioned technical scheme, when accomplishing the cutting, the piston rod shrink back of cylinder, the elasticity of elastic component makes the slider move to keeping away from the through-hole direction in the spout, makes the slider reset, and blade and riding wheel leave the copper pipe, are convenient for carry out the next cutting.

Preferably, be equipped with the connecting cylinder in the frame, the connecting cylinder with the main shaft coaxial line sets up, and the axis position of connecting cylinder is equipped with the mounting hole, the mounting hole runs through the connecting cylinder, and the terminal surface that the main shaft was kept away from to the connecting cylinder articulates there is the holding member of supporting, it has a plurality ofly to support the holding member and set up along mounting hole circumference equidistance interval, supports to be equipped with reset spring on the holding member, reset spring's one end with support the holding member and connect, reset spring's the other end and connecting cylinder are connected, have cup jointed the drive cover on the connecting cylinder, the drive cover is used for the drive to support the holding member to the axis direction rotation of connecting cylinder, and reset spring is used for making to support the holding member and rotates to the axis direction of keeping away from the connecting cylinder.

Through adopting above-mentioned technical scheme, the copper pipe passes the mounting hole of connecting cylinder, the through hole of main shaft in proper order to and the through-hole of blade holder, and through the axis direction rotation of driving the piece of keeping to the connecting cylinder of driving cover drive, keep to the piece contactable and keep to tight copper pipe, improve the stability of copper pipe, the blade of being convenient for cuts the copper pipe. When the diameter of the copper pipe is smaller than that of the through hole, the abutting piece can also abut against the copper pipe, so that the copper pipe is kept at the axis position of the cutter holder, the cutting is more stable, and the notch is smooth.

Preferably, driving sleeve and connecting cylinder threaded connection, the tip that the driving sleeve is close to the piece of supporting is equipped with the conical surface, support and be equipped with the spigot surface on the piece, conical surface and spigot surface butt, conical surface drive spigot surface are so that support the piece and rotate to the axis direction of connecting cylinder.

Through adopting above-mentioned technical scheme, rotate the driving sleeve, the driving sleeve can remove along the length direction of connecting cylinder, through the cooperation of conical surface and spigot surface, can make to support the tight piece and rotate to the axis direction of connecting cylinder, supports the contact of tight piece and supports tight copper pipe.

In summary, the present application includes at least one of the following beneficial technical effects:

1. in the rotary cutting process, the blade has pressure on each point of the circumferential surface of the copper pipe, and the stress is uniform, so that the deformation condition of the pipe orifice can be effectively improved; the blade can cut all points on the periphery of the copper pipe, so that the problem of large burrs can be solved;

2. the limiting block blocks the piston rod, so that the stroke of the piston rod can be accurately limited;

3. the abutting piece can contact and abut against the copper pipe, so that the stability of the copper pipe is improved, and the copper pipe can be conveniently cut by the blade.

Drawings

FIG. 1 is a schematic structural diagram of a copper pipe cutting machine according to an embodiment of the present application;

FIG. 2 is a cross-sectional view of a copper pipe cutting machine according to an embodiment of the present application;

FIG. 3 is an enlarged schematic view of portion A of FIG. 2;

FIG. 4 is an elevation view of the tool holder;

FIG. 5 is a cross-sectional view of the connecting tube, the abutment member and the driving sleeve.

Description of reference numerals:

1. a frame; 11. a control box; 12. a foot switch; 13. a mounting seat; 14. a main shaft; 141. a connecting shaft; 142. a chassis; 143. a through hole; 15. a protection plate; 16. a mounting frame; 17. mounting blocks; 2. a tool apron; 21. a blade; 22. a riding wheel; 23. an elastic member; 24. a through hole; 3. a drive mechanism; 31. a driving wheel; 32. a drive motor; 4. a retracting mechanism; 41. a sleeve; 42. a drive member; 43. a connecting rod; 44. connecting sheets; 45. a guide groove; 46. a limiting rod; 47. a limiting block; 5. a chute; 51. a first groove; 52. a second groove; 6. a slider; 61. a first end; 62. a second end; 63. a bevel; 7. a connecting cylinder; 71. mounting holes; 8. an abutting piece; 81. a tightening part; 82. a guide portion; 83. a return spring; 84. a guide surface; 9. a drive sleeve; 91. a conical surface.

Detailed Description

The present application is described in further detail below with reference to figures 1-5.

The embodiment of the application discloses copper pipe cutting machine. Referring to fig. 1, the copper pipe cutting machine comprises a frame 1, a cutter holder 2, a driving mechanism 3 and a contraction mechanism 4, wherein a control box 11 is fixed at one end of the frame 1, a foot switch 12 is electrically connected to the control box 11, and the driving mechanism 3 and the contraction mechanism 4 are electrically connected with the control box 11.

The foot switch 12 is stepped on, and the control box 11 controls the driving mechanism 3 and the contraction mechanism 4 to start; when the pedal switch 12 is released, the control box 11 controls the driving mechanism 3 and the retracting mechanism 4 to stop, which is convenient for the operation of the working personnel.

Referring to fig. 2 and 3, a mounting base 13 is fixed on the top of the frame 1, a main shaft 14 is arranged in the middle of the mounting base 13, and the main shaft 14 is horizontally arranged. The main shaft 14 includes a connecting shaft 141 and a base plate 142, the connecting shaft 141 is rotatably connected to the mounting base 13 through a bearing, the base plate 142 and the connecting shaft 141 are integrally formed, the diameter of the base plate 142 is larger than that of the connecting shaft 141, the base plate 142 is located at an end portion of the connecting shaft 141, and the base plate 142 and the connecting shaft 141 are coaxially arranged. A through hole 143 is formed in an axial position of the connecting shaft 141, and the through hole 143 penetrates the connecting shaft 141 and the chassis 142 along a length direction of the connecting shaft 141. The diameter of the through hole 143 is slightly larger than the outer diameter of the copper tube to be processed, so that the copper tube can pass through the through hole 143.

The driving mechanism 3 comprises a transmission wheel 31 and a driving motor 32, the transmission wheel 31 is positioned at one end of the connecting shaft 141 far away from the tool apron 2, and the transmission wheel 31 is fixedly connected with the connecting shaft 141. The driving wheel 31 is sleeved on the connecting shaft 141, and the driving wheel 31 and the connecting shaft 141 are coaxially arranged. The rack 1 is provided with a mounting frame 16, a driving motor 32 is fixedly connected with the mounting frame 16, and the driving motor 32 is electrically connected with the control box 11. In the present embodiment, the output shaft of the driving motor 32 is connected to the transmission wheel 31 through a belt; in other embodiments, the output shaft of the driving motor 32 may be connected to the transmission wheel 31 by a chain.

The driving motor 32 is started, the output shaft of the driving motor 32 drives the transmission wheel 31 to rotate, and the transmission wheel 31 drives the spindle 14 to rotate.

The tool apron 2 is cylindrical, the diameter of the tool apron 2 is the same as that of the base plate 142, the tool apron 2 is fixed on the end face, deviating from the connecting shaft 141, of the base plate 142 through a bolt, and the tool apron 2 and the base plate 142 are coaxially arranged. The axial line of the tool holder 2 is provided with a through hole 24, the through hole 24 penetrates through the tool holder 2, wherein the aperture of the through hole 24 is the same as that of the through hole 143, and the through hole 24 is opposite to the through hole 143.

The top of frame 1 is still fixed with guard plate 15, and guard plate 15 is "n" type, and guard plate 15 covers in mount pad 13 and blade holder 2. When the main shaft 14 drives the tool apron 2 to rotate at a high speed, the protection plate 15 plays a role in protection, the situation that a worker touches the tool apron 2 rotating at a high speed is reduced, and safety is improved.

The end surface of the tool apron 2 facing away from the chassis 142 is provided with a plurality of sliding grooves 5, in this embodiment, the number of the sliding grooves 5 is three, and the three sliding grooves 5 are arranged at equal intervals along the circumferential direction of the through hole 24; in other embodiments, the number of chutes 5 may also be four. The slide groove 5 includes a first groove 51 and a second groove 52, one end of the first groove 51 communicates with the circumferential surface of the holder 2, the other end of the first groove 51 communicates with one end of the second groove 52, and the other end of the second groove 52 communicates with the end surface of the holder 2 facing away from the base plate 142. The direction perpendicular to the axis of the holder 2 is the lengthwise direction of the second groove 52, and the lengthwise direction of the second groove 52 extends in the radial direction of the holder 2.

Referring to fig. 3 and 4, the slide grooves 5 are slidably connected with the slide block 6, the slide block 6 has a first end 61 and a second end 62, the first end 61 is located in the first groove 51, and the end of the first end 61 extends from the circumferential surface of the tool holder 2. The second end 62 is located in the second groove 52, the second end 62 is detachably and fixedly connected with the first end 61, the second end 62 is perpendicular to the first end 61, and the end of the second end 62, which is far away from the first end 61, extends from the end surface of the tool holder 2, which faces away from the bottom plate 142. Of the three second ends 62, one second end 62 is fixed with the blade 21, and the other two second ends 62 are rotatably connected with the riding wheels 22. The axis of the blade 21 and the axes of the two supporting rollers 22 are located on the same circle, and the center of the circle is located on the axis of the tool apron 2, wherein the diameter of the blade 21 is larger than that of the supporting rollers 22.

Wherein, the contraction mechanism 4 is used for driving the slide block 6 to slide in the slide groove 5 towards the through hole 24. The copper pipe passes through the through hole 143 and the through hole 24, the contraction mechanism 4 drives the sliding block 6 to slide towards the through hole 24, the blade 21 and the riding wheel 22 are folded towards the through hole 24, the blade 21 contacts and extrudes the copper pipe firstly, then the riding wheel 22 contacts the copper pipe, and the riding wheel 22 provides support for the copper pipe. Meanwhile, the driving motor 32 drives the main shaft 14 to rotate, the main shaft 14 drives the tool apron 2 to rotate, the tool apron 2 drives the blade 21 and the supporting wheel 22, and the blade 21 performs rotary cutting on the copper pipe.

The elastic member 23 is fixed to the side wall of the second groove 52 close to the through hole 24, and in this embodiment, the elastic member 23 is a spring, one end of the spring is fixedly connected to the side wall of the second groove 52, and the other end of the spring is fixedly connected to the side wall of the second end 62. In other embodiments, the elastic member 23 may be a rubber pad. By arranging the elastic part 23, after the cutting is finished, the slide block 6 can be reset by the elastic force of the elastic part 23, and the blade 21 and the riding wheel 22 are separated from the copper pipe so as to carry out the next cutting.

Referring to fig. 2 and 3, the retracting mechanism 4 includes a sleeve 41 and a driving member 42, the sleeve 41 is hollow and cylindrical, the sleeve 41 is sleeved on the tool holder 2, the sleeve 41 and the tool holder 2 are coaxially disposed, and a gap is left between an inner wall of the sleeve 41 and a circumferential surface of the tool holder 2. The end face of the first end 61 protruding from the peripheral surface of the holder 2 is a slope 63, the slope 63 is inclined downward from the side far from the bottom plate 142 to the side near the bottom plate 142, and the side of the sleeve 41 far from the mounting seat 13 contacts with the slope 63.

The driving member 42 is a cylinder, and the cylinder is electrically connected to the control box 11. The cylinder is located the top of mount pad 13, and the body and the mount pad 13 fixed connection of cylinder. The cylinder is the level setting, and the flexible direction of cylinder piston rod is parallel with the axis direction of blade holder 2, and the end fixing of piston rod has connecting rod 43, and connecting rod 43 is vertical to be set up, the bottom and the sleeve 41 fixed connection of connecting rod 43.

When the cylinder is started, the piston rod of the cylinder extends, the piston rod drives the sleeve 41 to move towards the direction away from the mounting seat 13, and the sliding block 6 is folded towards the through hole 24 in the sliding groove 5 through the matching of the sleeve 41 and the inclined surface 63.

The side of the mounting base 13 close to the bottom plate 142 is fixed with a connecting piece 44, and the connecting piece 44 is perpendicular to the side of the bottom plate 142. The connecting piece 44 is provided with a guide groove 45, the guide groove 45 is U-shaped, the extending direction of the guide groove 45 is parallel to the axial direction of the tool apron 2, the connecting rod 43 penetrates through the guide groove 45 from top to bottom, and the connecting rod 43 is connected with the side wall of the guide groove 45 in a sliding manner. A limiting rod 46 is fixed to the top of the mounting seat 13, a limiting block 47 is fixed to the end portion of the limiting rod 46, the limiting block 47 faces the piston rod of the air cylinder, and a distance exists between the limiting block 47 and the end portion of the piston rod.

After a piston rod of the air cylinder extends to a preset stroke, the piston rod touches the limiting block 47, the limiting block 47 blocks the piston rod so as to reduce the influence of inertia of the piston rod on the stroke, and the limiting block 47 can accurately limit the stroke of the piston rod; when the piston rod touches the stopper 47, the side of the sleeve 41 away from the mounting seat 13 can completely pass through the inclined surface 63. The connecting rod 43 slides in the guide groove 45, and the guide groove 45 can guide the connecting rod 43, so that the sleeve 41 can move more accurately.

Referring to fig. 2 and 5, the frame 1 is provided with an installation block 17, the installation block 17 is provided with a connecting cylinder 7, and the connecting cylinder 7 penetrates through the installation block 17 and is fixedly connected with the installation block 17. The connecting cylinder 7 and the connecting shaft 141 are coaxially arranged, an installation hole 71 is formed in the axis position of the connecting cylinder 7, the installation hole 71 penetrates through the connecting cylinder 7 along the length direction of the connecting cylinder 7, and the aperture of the installation hole 71 is the same as that of the through hole 24.

The end surface of the connecting cylinder 7 far away from the main shaft 14 is hinged with a plurality of abutting pieces 8, in the embodiment, the number of the abutting pieces 8 is three, and the three abutting pieces 8 are arranged at equal intervals along the circumferential direction of the mounting hole 71; in other embodiments, the number of the fastening members 8 may be four.

The abutting piece 8 comprises an abutting portion 81 and a guide portion 82, the guide portion 82 is hinged with the connecting cylinder 7, the guide portion 82 and the abutting portion 81 are integrally formed, and the guide portion 82 is located on one side, close to the mounting seat 13, of the abutting portion 81. The guide portion 82 is provided with a return spring 83, one end of the return spring 83 is fixedly connected with the guide portion 82, the other end of the return spring 83 is fixedly connected with the connecting cylinder 7, and the elastic force of the return spring 83 enables the abutting portion 81 to rotate towards the axis direction far away from the connecting cylinder 7.

The guide portion 82 is provided with a guide surface 84, the connecting cylinder 7 is sleeved with the driving sleeve 9, the driving sleeve 9 is in threaded connection with the connecting cylinder 7, the end portion, close to the guide portion 82, of the driving sleeve 9 is provided with a conical surface 91, the diameter of the conical surface 91 is gradually reduced towards the direction of the guide portion 82, and the conical surface 91 is abutted to the guide surface 84.

The copper pipe sequentially passes through the mounting hole 71, the through hole 143 and the through hole 24, the driving sleeve 9 is rotated clockwise, the driving sleeve 9 moves on the connecting cylinder 7 in the direction away from the mounting seat 13, the abutting portion 81 rotates in the axial direction of the connecting cylinder 7 through the matching of the conical surface 91 and the guide surface 84, and the abutting portion 81 can contact and abut against the copper pipe, so that the stability of the copper pipe is improved, and the copper pipe can be conveniently cut by the blade 21.

The implementation principle of the copper pipe cutting machine provided by the embodiment of the application is as follows: the copper pipe sequentially passes through the mounting hole 71, the through hole 143 and the through hole 24, then the driving sleeve 9 is rotated clockwise, the abutting piece 8 rotates towards the axial direction of the connecting cylinder 7, and the abutting part 81 contacts and abuts against the copper pipe. The pedal switch 12 is stepped on, the cylinder is started, the piston rod of the cylinder extends, the piston rod is abutted to the limiting block 47, the piston rod drives the sleeve 41 to move towards the direction far away from the mounting seat 13, the slide block 6 is folded towards the direction of the through hole 24 in the sliding groove 5 through the matching of the sleeve 41 and the inclined surface 63, the blade 21 contacts and extrudes the copper pipe, and the riding wheel 22 contacts and provides support for the copper pipe. Meanwhile, the driving motor 32 is started, the output shaft of the driving motor 32 drives the cutter holder 2 to rotate, the cutter holder 2 drives the blade 21, and the blade 21 performs rotary cutting on the copper pipe.

After cutting, the pedal switch 12 is released, the driving motor 32 stops, the piston rod of the cylinder contracts, the sleeve 41 moves towards the direction close to the mounting seat 13, the slide block 6 resets under the action of the elastic force of the elastic piece 23, and the blade 21 and the riding wheel 22 leave the copper pipe. The driving sleeve 9 is rotated counterclockwise, and the abutting part 81 releases the copper tube under the action of the return spring 83 so as to move the copper tube for the next cutting.

The above embodiments are preferred embodiments of the present application, and the protection scope of the present application is not limited by the above embodiments, so: all equivalent changes made according to the structure, shape and principle of the present application shall be covered by the protection scope of the present application.

Claims

1. A copper pipe cutting machine, characterized by comprising:

the pipe fitting machine comprises a machine frame (1), wherein a main shaft (14) is rotatably connected to the machine frame (1), and a through hole (143) for a pipe to pass through is formed in the axis position of the main shaft (14);

the tool rest (2) is fixedly connected with the end face of the main shaft (14), a through hole (24) is formed in the axis position of the tool rest (2), the through hole (24) is opposite to the through hole (143), a plurality of sliding grooves (5) are formed in the end face, far away from the main shaft (14), of the tool rest (2), the sliding grooves (5) are arranged at equal intervals along the circumferential direction of the through hole (24), the sliding grooves (5) extend along the radial direction of the tool rest (2), sliding blocks (6) are connected in the sliding grooves (5) in a sliding mode, a blade (21) is fixed on one sliding block (6), and supporting wheels (22) are arranged on the other sliding blocks (6);

the driving mechanism (3) is used for driving the main shaft (14) to rotate, and the driving mechanism (3) is fixedly connected with the rack (1);

and the contraction mechanism (4) is used for driving the sliding block (6) to slide towards the direction of the through hole (24) in the sliding groove (5), and the contraction mechanism (4) is fixedly connected with the rack (1).

2. Copper pipe cutting machine according to claim 1, characterized in that said drive mechanism (3) comprises:

the transmission wheel (31), the transmission wheel (31) is sleeved on the main shaft (14), and the transmission wheel (31) is fixedly connected with the main shaft (14);

the driving motor (32), the driving motor (32) is fixedly connected with the rack (1), and an output shaft of the driving motor (32) is connected with the driving wheel (31).

3. Copper pipe cutting machine according to claim 1, characterized in that said retraction mechanism (4) comprises:

the sleeve (41) is sleeved on the cutter holder (2), and the sleeve (41) and the cutter holder (2) are arranged coaxially;

the driving piece (42) is used for driving the sleeve (41) to move along the direction parallel to the axis of the tool apron (2), and the driving piece (42) is fixedly connected with the rack (1);

one end of the sliding block (6) extends out of the peripheral surface of the tool holder (2), the end face of the end portion is an inclined surface (63), and the sleeve (41) is used for driving the inclined surface (63) to enable the sliding block (6) to slide towards the through hole (24) in the sliding groove (5).

4. Copper pipe cutting machine according to claim 3, characterized in that the driving member (42) is a cylinder, the cylinder is fixedly connected with the frame (1), the extension direction of a piston rod of the cylinder is parallel to the axial direction of the tool apron (2), the piston rod of the cylinder is provided with a connecting rod (43), and one end of the connecting rod (43) far away from the cylinder is fixedly connected with the sleeve (41).

5. Copper pipe cutting machine according to claim 4, characterized in that the frame (1) is provided with a limiting rod (46), the end of the limiting rod (46) is provided with a limiting block (47), the limiting block (47) is opposite to the piston rod of the cylinder, and a distance is provided between the limiting block (47) and the end of the piston rod, so that the sleeve (41) can drive the inclined plane (63).

6. Copper pipe cutting machine according to claim 4, characterized in that the frame (1) is provided with a connecting piece (44), the connecting piece (44) is located below the cylinder, the connecting piece (44) is provided with a guide groove (45), the extending direction of the guide groove (45) is parallel to the axial direction of the tool apron (2), and the connecting rod (43) and the guide groove (45) are connected in a sliding manner.

7. Copper pipe cutting machine according to claim 3, characterized in that an elastic member (23) is arranged in the chute (5) at a position close to the through hole (24), wherein one side of the elastic member (23) away from the through hole (24) is connected with the slider (6), and the elastic member (23) is used for resetting the slider (6).

8. The copper pipe cutting machine according to claim 1, wherein a connecting cylinder (7) is arranged on the machine frame (1), the connecting cylinder (7) and the main shaft (14) are coaxially arranged, an installation hole (71) is formed in the axial position of the connecting cylinder (7), the installation hole (71) penetrates through the connecting cylinder (7), a resisting piece (8) is hinged to the end surface, away from the main shaft (14), of the connecting cylinder (7), the resisting piece (8) is provided with a plurality of resisting pieces (8), the resisting pieces (8) are arranged at equal intervals along the circumferential direction of the installation hole (71), a return spring (83) is arranged on each resisting piece (8), one end of each return spring (83) is connected with each resisting piece (8), the other end of each return spring (83) is connected with the connecting cylinder (7), a driving sleeve (9) is sleeved on the connecting cylinder (7), and the driving sleeve (9) is used for driving each resisting piece (8) to rotate towards the axial direction of the connecting cylinder (7), the return spring (83) is used for rotating the abutting piece (8) in the axial direction far away from the connecting cylinder (7).

9. Copper pipe cutting machine according to claim 8, characterized in that the driving sleeve (9) is screwed to the connecting cylinder (7), the end of the driving sleeve (9) close to the fastening member (8) is provided with a conical surface (91), the fastening member (8) is provided with a guide surface (84), the conical surface (91) is abutted against the guide surface (84), and the conical surface (91) drives the guide surface (84) to rotate the fastening member (8) to the axial direction of the connecting cylinder (7).