CN109049086B

CN109049086B - Dust-free pipe cutting machine for cutting small-pipe-diameter pipes

Info

Publication number: CN109049086B
Application number: CN201811010447.1A
Authority: CN
Inventors: 张建均; 牟亦龙; 柳玉龙; 林鸥; 王江; 冯锦奎
Original assignee: Yonggao Co Ltd
Current assignee: Era Co Ltd
Priority date: 2018-08-31
Filing date: 2018-08-31
Publication date: 2020-12-18
Anticipated expiration: 2038-08-31
Also published as: CN109049086A

Abstract

The invention provides a dust-free pipe cutting machine for cutting small-caliber pipes, and belongs to the technical field of machinery. The automatic cutting device solves the problem of how to realize the automatic cutting of small-caliber pipes with high speed and high quality. This pipe cutting machine includes frame and cutting device, cutting device include with frame sliding connection and the mounting bracket that can remove, it is connected with the barrel to rotate on the mounting bracket, the both ends of barrel are equipped with clamping component, circumference location has sliding component on the barrel, sliding component can be along barrel endwise slip, be fixed with the link on the middle section of barrel, the both ends of link are equipped with knife rest and gyro wheel frame respectively, the cutter piece has on the knife rest, the gyro wheel has on the gyro wheel frame, the window has on the section of thick bamboo wall of barrel, be equipped with guide structure between sliding component and the link, along with sliding component's endwise slip, guide structure can make cutter piece and gyro wheel radially follow the both sides entering window of barrel respectively along the barrel. The whole cutting process of the pipe cutting machine is full-automatic, the cutting speed is high, and the cutting quality is good.

Description

Dust-free pipe cutting machine for cutting small-pipe-diameter pipes

Technical Field

The invention belongs to the technical field of machinery, and relates to a dust-free pipe cutting machine for cutting a pipe with a small pipe diameter.

Background

At present, the plastic pipe has the advantages of light weight, practicability, environmental protection, corrosion resistance and the like, and is widely applied to the fields of water supply, drainage, gas and municipal public engineering in China. Because of its advantages of portability, easy interface processing, easy construction and the like, the utility model is popular with users. The PVC pipe has the advantages of good resistance, compressive strength, small fluid resistance, corrosion resistance, excellent chemical resistance, good water tightness and the like, and is widely applied. In recent years, due to the expansion of the application range of plastic pipes, the increase of varieties and the continuous improvement of quality, higher requirements are put on machines for processing the plastic pipes.

In the prior art, a pipe cutting machine is generally adopted for cutting large-diameter pipes; however, for the cutting processing of the small-caliber pipe, because the pipe diameter of the pipe is small, the existing pipe cutting machine cannot be suitable for the cutting processing of the small-caliber pipe due to the clamping and cutting problems; generally, a cutting device consisting of a motor and a saw blade is operated manually to cut in a rotating manner, so that not only can chips be easily generated in the rotating and pipe friction cutting processes of the saw blade, but also the problems of serious pipe orifice deformation, large burrs and the like can be easily caused, and sawdust dust can be generated in the cutting process, which has certain harm to the environment and the human health.

Disclosure of Invention

The invention aims to provide a dust-free pipe cutting machine for cutting small-diameter pipes, aiming at solving the problems in the prior art, and the technical problem of how to realize the automatic cutting of the small-diameter pipes with high speed and high quality.

The purpose of the invention can be realized by the following technical scheme: a dust-free pipe cutting machine for cutting small-diameter pipes comprises a machine frame and a cutting device arranged in the machine frame, and is characterized in that the cutting device comprises a mounting frame which is connected with the machine frame in a sliding mode and can move under the driving of a first driving piece, a barrel which is cylindrical and has an inner diameter larger than the outer diameter of the pipes is connected to the mounting frame in a rotating mode, the barrel can rotate under the driving of a second driving piece, clamping assemblies used for clamping the pipes and fixing the pipes relative to the mounting frame are arranged at two ends of the barrel, sliding assemblies are circumferentially positioned on the barrel and can slide axially along the barrel under the driving of a third driving piece, a connecting frame is fixed to the middle section of the barrel, a cutter frame and a roller frame which can slide in the diameter direction of the barrel are respectively connected to two ends of the connecting frame in a sliding mode, and a cutting blade is connected to the cutter frame in a rotating, the roller wheel frame is rotatably connected with roller wheels, the barrel wall of the gun barrel is provided with windows penetrating through the barrel walls on two sides, a guide structure is arranged between the sliding assembly and the connecting frame, and the guide structure can enable the cutting blades and the roller wheels to respectively enter the windows from two sides of the gun barrel along the radial direction of the gun barrel along the axial sliding of the sliding assembly.

The dust-free pipe cutting machine for cutting the small-caliber pipes is directly butted with the pipe extruder, so that the automatic cutting of the small-caliber pipes with high speed and high quality can be realized, and the working principle is as follows: when a pipe enters from one end of the gun barrel after being extruded by the extruder and penetrates out from the other end of the gun barrel, the pipe is clamped by the clamping assembly, the pipe is fixed differently relative to the mounting rack, because the pipe is extruded continuously by the extruder, the cutting device slides on the rack along with the movement of the pipe, namely, the pipe is extruded continuously, the pipe and the cutting device move synchronously, in the process, the gun barrel rotates under the action of the driving piece II, the sliding assembly, the connecting rack, the cutting blade and the roller rotate along with the gun barrel, then, the sliding assembly performs feeding action under the driving of the driving piece III, namely, the sliding assembly moves, under the action of the guide structure, the cutter rack and the roller rack move and feed to the gun barrel along the diameter direction until the cutting blade and the roller enter into a window of the gun barrel and contact with the pipe, and the cutting blade and the roller rotate along with the circumferential direction around the pipe and perform radial feeding action, thus realizing the annular cutting of the pipe; after cutting is finished, discharging under the pushing of the extruded pipe, then controlling the cutting device to reset by the driving piece I, controlling the sliding assembly, the cutting blade, the roller and other parts to reset by the driving piece three, and then repeating the process to perform next cutting operation; through the pipe cutting machine of above structural design, need not the manual operation cutting, not only cutting speed is fast, and the mode of the annular cutting of above cutting blade and gyro wheel cooperation can not excessively extrude the mouth of pipe moreover, can not lead to the mouth of pipe to warp or the big problem of burr appears, and the cutting quality is good.

In the dust-free pipe cutting machine for cutting small-caliber pipes, the guide structure comprises a first guide plate and a second guide plate which are fixed on the sliding assembly, the first guide plate and the second guide plate are positioned on two sides of the gun barrel and positioned in the same diameter direction, a first guide groove inclined relative to the axis direction of the gun barrel is formed in the first guide plate, a second guide groove opposite to the first guide groove in inclination direction is formed in the second guide plate, the cutting blade is rotatably connected to one end of the cutter frame, a first guide wheel capable of rolling along the first guide groove is arranged at the other end of the cutter frame, the roller is rotatably connected to one end of the roller frame, and a second guide wheel capable of rolling along the second guide groove is arranged at the other end of the roller frame. Alternatively, the guide wheel can be rotatably connected to the guide plate, and the guide groove can be formed in the tool rest and the roller frame; through the design, when the sliding assembly moves axially, the first guide groove and the second guide groove are opposite in inclination direction, so that the first guide wheel and the second guide wheel can control the cutter frame and the roller frame to synchronously move and feed to the gun barrel along the diameter direction when the first guide groove and the second guide groove roll respectively until the cutter blade and the roller enter a window of the gun barrel to be contacted with a pipe, and the cutter blade and the roller move along with circumferential rotation around the pipe and radial feeding so as to realize annular cutting of the pipe.

In the dust-free pipe cutting machine for cutting the small-diameter pipe, the second guide plate is provided with a third guide groove parallel to the axis of the gun barrel, the third guide groove is connected with one end, close to the gun barrel, of the second guide groove, and the second guide wheel can sequentially roll along the second guide groove and the third guide groove. Through the design of the third guide groove, the roller can not feed inwards in the radial direction after being fed to a proper position, so that the roller can provide proper pressure for the pipe in the cutting process, the pipe cannot be excessively extruded to cause deformation of the pipe orifice, and the cutting quality of the pipe is improved.

In the dust-free pipe cutting machine for cutting small-caliber pipes, the sliding assembly comprises a sliding sleeve sleeved on the barrel, the sliding sleeve and the barrel are circumferentially positioned, the first guide plate and the second guide plate are respectively fixedly connected to the sliding sleeve, the sliding sleeve is rotatably connected with a connecting sleeve through a bearing, and the connecting sleeve can drive the sliding sleeve to axially move under the driving of the third driving part. Through the cooperation design of above sliding sleeve and adapter sleeve for the sliding sleeve can follow the barrel and rotate, can carry out axial displacement again in order to realize the radial feed action of cutter blade and gyro wheel, thereby makes this pipe cutting machine can realize the annular cutting, guarantees the cutting quality of tubular product.

In the dust-free pipe cutting machine for cutting the pipe with the small pipe diameter, the outer circumferential surface of the gun barrel is fixedly provided with a strip-shaped key which is arranged along the axial direction, and the inner wall of the sliding sleeve is provided with a groove which is in sliding fit with the key. Through the matching design of the keys and the grooves, the circumferential positioning of the sliding sleeve and the gun barrel is realized.

In the dust-free pipe cutting machine for cutting the small-diameter pipe, a guide rod arranged along the axial direction of the gun barrel is fixed on the connecting sleeve, and the guide rod is connected with the mounting frame in a sliding manner. Through the design, the connecting sleeve can stably drive the sliding sleeve to move axially, so that the stability of radial feeding of the cutting blade and the roller is improved, and the cutting quality of the pipe is improved.

In the dust-free pipe cutting machine for cutting small-diameter pipes, the clamping assembly includes a first cylindrical clamping sleeve fixedly connected to the mounting frame and a second cylindrical clamping sleeve inserted into the first clamping sleeve, one end of the first clamping sleeve extends into a port at an end corresponding to the barrel, an outer diameter of an extending end of the first clamping sleeve is smaller than an inner diameter of the barrel, a tapered clamping hole with an inward large end is formed in the port of the extending end of the first clamping sleeve, the second clamping sleeve is inserted into the first clamping sleeve, and the second clamping sleeve can extend into the tapered clamping hole and elastically deform under the driving of the clamp cylinder. The working principle of the clamping assembly designed above is as follows: when the pipe coming out of the extruder penetrates out of one end of the pipe cutting machine, before cutting, the clamping assemblies at two ends of the gun barrel work, namely the clamping sleeve II extends into the conical clamping hole under the action of the clamp cylinder and is elastically reduced and deformed, so that the pipe located in the clamping sleeve II is clamped and fixed, and the clamping sleeve II is wrapped in the circumferential direction of the pipe, so that the clamping effect is good, and the cutting quality of the pipe is improved.

In the dust-free pipe cutting machine for cutting the pipe with the small pipe diameter, the outer circumferential surface of the jacket is provided with a plurality of openings arranged along the circumferential direction, the openings extend along the axial direction of the second jacket, and one end of each opening penetrates through the end part of the extending end of the second jacket. Through the design of above open-ended for press from both sides the quick realization elastic deformation more easily of cover two, thereby make tubular product can obtain faster, better clamp tightly, be favorable to improving tubular product and press from both sides tight fastness.

In the dust-free pipe cutting machine for cutting the pipe with the small pipe diameter, the end opening at the outer end of the jacket is provided with a guide taper hole with a large end facing outwards. Through the design, the pipe can smoothly extend into the second clamping sleeve, and the clamping and cutting of the pipe are facilitated.

In the dust-free pipe cutting machine for cutting small-caliber pipes, a casing for sealing the cutting device is fixed on the frame, a feed inlet is formed in one end of the casing, a discharge outlet is formed in the other end of the casing, the mounting frame comprises a bottom plate which is slidably connected with the frame, and a first mounting plate, a second mounting plate and a third mounting plate which are sequentially fixed on the bottom plate, two ends of the gun barrel are rotatably connected with the first mounting plate and the second mounting plate through bearings respectively, and sealing plates are fixed on the frame on two sides of the gun barrel. Through the design of above casing and shrouding, can block the cutting dust, realize dustless cutting.

In the dust-free pipe cutting machine for cutting small-caliber pipes, the fixing plates are fixed on the outer sides of the first mounting plate and the third mounting plate, the clamp cylinders are fixed on the corresponding fixing plates, the second jacket is fixed with the push plate, and the push plate is fixedly connected with the piston rods of the corresponding clamp cylinders. Through the design, the clamp cylinder is connected with the second clamping sleeve, so that the clamp cylinder can control the second clamping sleeve to clamp or loosen.

Compared with the prior art, the dust-free pipe cutting machine for the pipe with the small pipe diameter has the following advantages:

1. the whole cutting process of the dust-free pipe cutting machine is full-automatic, manual operation for cutting is not needed, and the cutting speed is high;

2. through a specially designed annular cutting mode, excessive extrusion on the pipe orifice is avoided, the problem of deformation of the pipe orifice or large burrs is avoided, and the cutting quality is good;

3. in the cutting process, the external environment of the pipe cutting machine is ensured to be dust-free and environment-friendly.

Drawings

Fig. 1 is a schematic view of the overall structure of the dust-free pipe cutting machine.

Fig. 2 is a schematic view of the overall structure of the dust-free pipe cutting machine with the casing removed.

Fig. 3 is a schematic view of a part of an explosion structure of a cutting device in the dust-free pipe cutting machine.

Fig. 4 is a schematic structural diagram of a cutting device in the dust-free pipe cutting machine.

Fig. 5 is a schematic sectional view of the cutting device in the dust-free pipe cutting machine.

Fig. 6 is a schematic structural diagram of a gun barrel in the dust-free pipe cutting machine.

Fig. 7 is a schematic structural matching view of a connecting frame part in the dust-free pipe cutting machine.

Fig. 8 is a schematic view of the structural fit of the connecting sleeve part in the dust-free pipe cutting machine.

Fig. 9 is an exploded view of the clamp assembly of the dust-free pipe cutter.

In the figure, 1, a frame; 2. a housing; 3. a carrier roller; 4. a mounting frame; 41. a base plate; 42. a first mounting plate; 43. a second mounting plate; 44. mounting a third plate; 45. closing the plate; 5. a first driving part; 6. a barrel; 61. a window; 7. a driving part II; 8. a clamping assembly; 81. a first jacket; 811. a tapered clamp hole; 82. a second jacket; 821. an opening; 822. a guiding taper hole; 9. a sliding assembly; 91. a sliding sleeve; 92. connecting sleeves; 10. a driving member III; 11. a first guide plate; 111. a first guide groove; 12. a second guide plate; 121. a second guide groove; 122. a third guide groove; 13. a connecting frame; 14. a tool holder; 15. a roller frame; 16. cutting a blade; 17. a first guide wheel; 18. a roller; 19. a second guide wheel; 20. a key; 21. a guide bar; 22. a clamp cylinder; 23. a fixing plate; 24. and pushing the plate.

Detailed Description

The following are specific embodiments of the present invention and are further described with reference to the drawings, but the present invention is not limited to these embodiments.

Specifically, as shown in fig. 1 and 2, the dust-free pipe cutting machine for cutting a pipe with a small pipe diameter comprises a frame 1, carrier rollers 3 arranged at two ends of the frame 1, and a cutting device arranged in the frame 1, wherein a casing 2 for sealing the cutting device is fixed on the frame 1, a feed inlet is formed in one end of the casing 2, and a discharge outlet is formed in the other end of the casing. In this embodiment, there are two the same cutting device, this cutting device include with 1 sliding connection of frame and can be under the drive of driving piece 5 along the mounting bracket 4 of 1 length direction of frame upward removal, be fixed with the slide rail in the frame 1, sliding connection has the slip table on the slide rail, and mounting bracket 4 links firmly with the slip table. The driving part I5 is a driving cylinder, a hydraulic cylinder or a linear motor and the like. As shown in fig. 3, 4 and 5, the barrel 6 which is in a cylindrical shape and has an inner diameter larger than the outer diameter of the pipe is rotatably connected to the mounting frame 4, the mounting frame 4 includes a bottom plate 41 which is slidably connected to the frame 1, and a first mounting plate 42, a second mounting plate 43 and a third mounting plate 44 which are sequentially fixed to the bottom plate 41, two ends of the barrel 6 are rotatably connected to the first mounting plate 42 and the second mounting plate 43 through bearings, respectively, and sealing plates 45 are fixed to the frame 1 on two sides of the barrel 6. The gun barrel 6 can rotate relative to the mounting frame 4 under the drive of the second driving piece 7. Wherein, the barrel 6 is fixed with a belt wheel which is positioned between a second mounting plate 43 and a third mounting plate 44, and the second driving part 7 is a rotating motor or a hydraulic motor.

The two ends of the barrel 6 are further provided with clamping assemblies 8 for clamping the pipe and fixing the pipe relative to the mounting frame 4, wherein as shown in fig. 9, each clamping assembly 8 comprises a first cylindrical jacket 81 fixedly connected with the mounting frame 4 and a second cylindrical jacket 82 inserted into the first jacket 81, one end of the first jacket 81 extends into a port of the corresponding end of the barrel 6, the outer diameter of the extending end of the first jacket 81 is smaller than the inner diameter of the barrel 6, a tapered clamping hole 811 with an inward large end is formed in the port of the extending end of the first jacket 81, the second jacket 82 is inserted into the first jacket 81, and the second jacket 82 can extend into the tapered clamping hole 811 and is elastically deformed and reduced under the driving of the clamp cylinder 22. A plurality of openings 821 arranged along the circumferential direction are formed on the outer circumferential surface of the second jacket 82, the openings 821 extend along the axial direction of the second jacket 82, and one end of each opening penetrates through the end part of the extending end of the second jacket 82. The outer end port of the second jacket 82 is provided with a guide taper hole 822 with a large end facing outwards. The outer sides of the first mounting plate 42 and the third mounting plate 44 are both fixed with a fixing plate 23, the clamp cylinder 22 is fixed on the corresponding fixing plate 23, the second jacket 82 is fixed with a push plate 24, and the push plate 24 is fixedly connected with a piston rod of the corresponding clamp cylinder 22.

The barrel 6 is also circumferentially provided with a sliding assembly 9, the sliding assembly 9 can axially slide along the barrel 6 under the driving of a driving piece three 10, a guide plate I11 and a guide plate II 12 are fixed on the sliding assembly 9, and the guide plate I11 and the guide plate II 12 are located on two sides of the barrel 6 and located in the same diameter direction. The sliding assembly 9 comprises a sliding sleeve 91 sleeved on the gun barrel 6, the sliding sleeve 91 is circumferentially positioned with the gun barrel 6, a first guide plate 11 and a second guide plate 12 are fixedly connected to the sliding sleeve 91 respectively, a connecting sleeve 92 is rotatably connected to the sliding sleeve 91 through a bearing, and the connecting sleeve 92 can drive the sliding sleeve 91 to axially move under the driving of a third driving part 10. The driving part three 10 is a driving cylinder, a hydraulic cylinder or a linear motor. The outer peripheral surface of the barrel 6 is fixed with a strip-shaped key 20 which is arranged along the axial direction, and the inner wall of the sliding sleeve 91 is provided with a groove which is in sliding fit with the key 20. The connecting sleeve 92 is fixed with a guide rod 21 arranged along the axial direction of the gun barrel 6, and the guide rod 21 is connected with the mounting frame 4 in a sliding way.

As shown in fig. 7 and 8, the first guide plate 11 is provided with a first guide groove 111 inclined relative to the axial direction of the barrel 6, the second guide plate 12 is provided with a second guide groove 121 inclined opposite to the first guide groove 111, the middle section of the barrel 6 is fixed with a connecting frame 13, two ends of the connecting frame 13 are respectively connected with a cutter frame 14 and a roller frame 15 which can slide in the diameter direction of the barrel 6 in a sliding manner, one end of the cutter frame 14 is rotatably connected with a cutting blade 16, the other end of the cutter frame 14 is rotatably connected with a first guide wheel 17 which can roll along the first guide groove 111, one end of the roller frame 15 is rotatably connected with a roller 18, the other end of the roller frame 15 is rotatably connected with a second guide wheel 19 which can roll along the second guide groove 121, the second guide plate 12 is provided with a third guide groove 122 which is parallel to the axial direction of the barrel 6, the third guide groove 122 is close to one end of the barrel 6 with the second guide groove 121, and the second. As shown in fig. 6, the barrel wall of the barrel 6 is formed with a window 61 penetrating from one side to the other side of the barrel wall in the diameter direction, the cutter blade 16 can enter the window 61 on one side of the barrel 6, and the roller 18 can enter the window 61 on the other side of the barrel 6.

The specific embodiments described herein are merely illustrative of the spirit of the invention. Various modifications or additions may be made to the described embodiments or alternatives may be employed by those skilled in the art without departing from the spirit or ambit of the invention as defined in the appended claims.

Although the terms of the frame 1, the housing 2, the idler roller 3, the mounting frame 4, the bottom plate 41, the first mounting plate 42, the second mounting plate 43, the third mounting plate 44, the sealing plate 45, the first driving member 5, the barrel 6, the window 61, the second driving member 7, the clamping assembly 8, the first jacket 81, the tapered clamp hole 811, the second jacket 82, the opening 821, the guide tapered hole 822, the sliding assembly 9, the sliding sleeve 91, the connecting sleeve 92, the third driving member 10, the first guide plate 11, the first guide groove 111, the second guide plate 12, the second guide groove 121, the third guide groove 122, the connecting frame 13, the tool holder 14, the roller holder 15, the cutting blade 16, the first guide wheel 17, the roller 18, the second guide wheel 19, the key 20, the guide rod 21, the clamp cylinder 22, the fixing plate 23, the pushing plate 24 and the like are used more frequently, the possibility of using other. These terms are used merely to more conveniently describe and explain the nature of the present invention; they are to be construed as being without limitation to any additional limitations that may be imposed by the spirit of the present invention.

Claims

1. The dust-free pipe cutting machine for cutting small-pipe-diameter pipes comprises a rack (1) and a cutting device arranged in the rack (1), and is characterized in that the cutting device comprises a mounting rack (4) which is connected with the rack (1) in a sliding manner and can move under the driving of a driving piece I (5), a barrel (6) which is cylindrical and has an inner diameter larger than the outer diameter of the pipe is rotatably connected onto the mounting rack (4), the barrel (6) can rotate under the driving of a driving piece II (7), clamping components (8) which are used for clamping the pipe and fixing the pipe relative to the mounting rack (4) are arranged at two ends of the barrel (6), sliding components (9) are circumferentially positioned on the barrel (6), the sliding components (9) can axially slide along the barrel (6) under the driving piece III (10), a connecting rack (13) is fixed onto the middle section of the barrel (6), and two ends of the connecting rack (13) are respectively connected with a tool rest which can slide in the diameter direction of the barrel (6) in a sliding manner (14) The cutting blade (16) is connected to the tool rest (14) in a rotating mode, the roller (18) is connected to the roller frame (15) in a rotating mode, a window (61) penetrating through the barrel walls on two sides is formed in the barrel wall of the gun barrel (6), a guide structure is arranged between the sliding assembly (9) and the connecting frame (13), and the cutting blade (16) and the roller (18) can enter the window (61) from two sides of the gun barrel (6) along the radial direction of the gun barrel (6) through the guide structure along with axial sliding of the sliding assembly (9); the guiding structure comprises a first guiding plate (11) and a second guiding plate (12) which are fixed on the sliding assembly (9), the first guiding plate (11) and the second guiding plate (12) are positioned on two sides of the gun barrel (6) and positioned on the same diameter direction, a first guiding groove (111) which inclines relative to the axis direction of the gun barrel (6) is arranged on the first guiding plate (11), a second guiding groove (121) which inclines opposite to the first guiding groove (111) is arranged on the second guiding plate (12), a cutting blade (16) is rotatably connected to one end of a tool rest (14), a first guiding wheel (17) which can roll along the first guiding groove (111) is arranged at the other end of the tool rest (14), a roller (18) is rotatably connected to one end of a roller frame (15), a second guiding wheel (19) which can roll along the second guiding groove (121) is arranged at the other end of the roller frame (15), and a third guiding groove (122) which is parallel to the axis of the gun barrel (6) is arranged on the second guiding plate (12, the third guide groove (122) is connected with one end, close to the gun barrel (6), of the second guide groove (121), and the second guide wheel (19) can roll along the second guide groove (121) and the third guide groove (122) in sequence.

2. The dust-free pipe cutting machine for cutting small-diameter pipes according to claim 1, wherein the sliding assembly (9) comprises a sliding sleeve (91) sleeved on the barrel (6), the sliding sleeve (91) is circumferentially positioned with the barrel (6), the first guide plate (11) and the second guide plate (12) are respectively fixedly connected to the sliding sleeve (91), a connecting sleeve (92) is rotatably connected to the sliding sleeve (91) through a bearing, and the connecting sleeve (92) can drive the sliding sleeve (91) to axially move under the driving of the driving member III (10).

3. The dust-free pipe cutting machine for cutting small-diameter pipes according to claim 2, wherein the outer circumferential surface of the barrel (6) is fixed with a strip-shaped key (20) which is arranged along the axial direction, and the inner wall of the sliding sleeve (91) is provided with a groove which is in sliding fit with the key (20).

4. The dust-free pipe cutting machine for cutting small-diameter pipes according to any one of claims 1 to 3, wherein the clamping assembly (8) comprises a first cylindrical jacket (81) fixedly connected with the mounting frame (4) and a second cylindrical jacket (82) inserted into the first jacket (81), one end of the first jacket (81) extends into a corresponding end port of the barrel (6), the outer diameter of the extending end of the first jacket (81) is smaller than the inner diameter of the barrel (6), the end port of the extending end of the first jacket (81) is provided with a conical clamping hole (811) with an inward large end, the second jacket (82) is inserted into the first jacket (81), and the second jacket (82) can extend into the conical clamping hole (811) and generate elastic reduction deformation under the driving of the clamp cylinder (22).

5. The dust-free pipe cutting machine for cutting the small-diameter pipe according to claim 4, wherein the second jacket (82) is provided with a plurality of circumferentially arranged openings (821) on the outer circumferential surface, the openings (821) extend along the axial direction of the second jacket (82) and one end of each opening penetrates through the end of the extending end of the second jacket (82).

6. The dust-free pipe cutting machine for cutting small-diameter pipes according to claim 4, wherein the outer end port of the second jacket (82) is provided with a guide taper hole (822) with a large end facing outwards.

7. The dust-free pipe cutting machine for cutting small-diameter pipes is characterized in that a casing (2) for sealing a cutting device is fixed on the frame (1), one end of the casing (2) is provided with a feeding hole, the other end of the casing is provided with a discharging hole, the mounting frame (4) comprises a bottom plate (41) which is in sliding connection with the frame (1), and a first mounting plate (42), a second mounting plate (43) and a third mounting plate (44) which are sequentially fixed on the bottom plate (41), two ends of the gun barrel (6) are respectively in rotating connection with the first mounting plate (42) and the second mounting plate (43) through bearings, and sealing plates (45) are fixed on the frame (1) on two sides of the gun barrel (6).

8. The dust-free pipe cutting machine for cutting small-diameter pipes according to claim 7, wherein the mounting plates (42) and the mounting plates (44) are fixed with fixing plates (23) on the outer sides, the clamp cylinders (22) are fixed on the corresponding fixing plates (23), the second clamping sleeve (82) is fixed with a pushing plate (24), and the pushing plate (24) is fixedly connected with the piston rods of the corresponding clamp cylinders (22).