Manual pipe cutter with elastic buffer structure

Abstract

The utility model belongs to the technical field of pipe cutting knife, specifically relates to manual pipe cutting knife with elastic buffer structure, and the utility model discloses the following technical scheme: manual pipe cutting knife with elastic buffer structure includes: cutter body, has straight handle portion and curved portion, straight handle portion sets up through -hole, and through -hole has the pilot section, rolling subassembly, sliding sleeve, set up through -hole, and through -hole has the thread section, pipe cutting subassembly includes blade, end cap, rotating rod has the outer thread portion with the thread section cooperation of sliding sleeve, and the outer end protrudes end cap, control subassembly is fixedly connected with rotating rod, and including the axial portion of the sleeve setting in the end cap and the radial convex part of the sleeve setting in the straight handle portion and the one end close to blade, elastic part is located between radial convex part and end cap, wherein, when cutting pipe, rolling subassembly and blade hold the pipe material to be cut, and elastic part is compressed. The utility model has the beneficial effects of providing a new elastic buffer structure.

Description

Technical Field

[0001] This utility model belongs to the field of pipe cutter technology, specifically relating to a manual pipe cutter with an elastic buffer structure. Background Technology

[0002] A pipe cutter is a tool used to cut PVC, PP-R and other plastic pipes, as well as aluminum-plastic composite pipes and thin metal pipes. In fields such as air conditioning and cold chain technology, pipe cutters are commonly used to cut pipes (such as copper pipes).

[0003] Existing manual pipe cutters include a blade body, two sets of rotatable rollers fixed to the blade body, and a cutting assembly that moves relative to the blade body. The cutting assembly includes a rotatable blade, and during operation, the cutting blade and rollers press against the pipe and rotate. When there is no elastic buffer between the cutting assembly and the blade body, the blade is prone to chipping and damage when cutting copper pipes, affecting its service life (for example, if the feed is 1mm, the blade will directly shift 1mm relative to the pipe; excessive feed in a single operation will damage the blade and result in an uneven cut).

[0004] To address the issue of blade chipping, CN209006764U discloses a portable pipe cutter with elastic preload, incorporating a spring-loaded elastic buffer structure. However, this design still suffers from problems such as structural complexity, high precision requirements, and stringent spring requirements. Other manual pipe cutters with elastic buffer structures also exhibit similar or other issues. Summary of the Invention

[0005] This invention addresses the shortcomings of existing manual pipe cutters with elastic buffer structures by providing a manual pipe cutter with an elastic buffer structure, either by improving the elastic buffer structure or by providing a new elastic buffer structure.

[0006] To achieve the above objectives, this utility model adopts the following technical solution: a manual pipe cutter with an elastic buffer structure, the manual pipe cutter with an elastic buffer structure comprising: The blade body has a straight shank and a curved section. The straight shank has a through hole, and the through hole has a guide section. A rolling assembly is installed on the curved portion of the cutter body at the end furthest from the straight shank. The sliding sleeve is located in the through hole and engages with the guide section to prevent rotation. It has a through hole with a threaded section. A tube cutting assembly, including a blade rotatably disposed on a sleeve near the end of a rolling element; The elastic element is located outside the straight handle portion; During pipe cutting, the rolling assembly and the blade clamp the pipe to be cut, and the elastic element is compressed and preload is applied to the sliding sleeve.

[0007] This utility model discloses a manual pipe cutter with an elastic buffer structure. Its moving parts include a sliding sleeve, a rotating rod, and a control assembly (the deformation of the elastic element is not considered as movement). When cutting the pipe, the pipe to be cut is first placed on the rolling assembly. Then, the control assembly is rotated, causing the rotating rod to rotate (without axial displacement) and drive the sliding sleeve and the blade on it to move linearly towards the rolling assembly (the blade body prevents the sliding sleeve from rotating). When the blade touches the pipe to be cut, the sliding sleeve can no longer move. At this time, the control assembly is rotated again. During the rotation, the rotating rod will move axially away from the blade, which in turn drives the control assembly axially away from the blade. During the process of moving away from the blade, the control assembly compresses the elastic element, and a preload is applied to the blade through the elastic element, the control assembly, the rotating rod, and the sliding sleeve. The sliding sleeve is reliably guided by the cooperation of the sliding sleeve and the blade body.

[0008] As an improvement, the manual pipe cutter with an elastic buffer structure also includes: End cap, fixed to the outer side of the straight shank of the blade, away from the blade; The rotating rod has an external thread that mates with the threaded section of the sliding sleeve, and its outer end extends out of the end cap; The control assembly, fixedly connected to the rotating rod, includes an axial portion sleeved outside the end cap and a radial protrusion sleeved outside the straight shank portion near the blade end.

[0009] As an improvement, the elastic element is located between the radial protrusion and the end cap.

[0010] As an improvement, the rotating rod forms an abutment portion located between the end cap and the sliding sleeve. Before the elastic element is compressed, there is a gap between the abutment portion of the rotating rod and the end cap.

[0011] As an improvement, the through hole of the cutter body forms a guide section, an abutment section, and a receiving section. The abutment portion is located between the receiving section and the guide section. A limiting gasket is also provided in the receiving section, and the limiting gasket is located between the abutment portion and the end wall of the abutment section of the cutter body; and / or, The end cap is threaded to the straight shank of the blade.

[0012] As an improvement, multiple circumferentially distributed ribs are extended into the guide section of the through hole of the cutter body, and the outer surface of the sliding sleeve has four guide anti-rotation planes. The multiple ribs form four planes that cooperate with the guide anti-rotation planes.

[0013] As an improvement, the control assembly includes a knob, a cover, and a screw. The knob and the cover are threaded together. The outer end of the rotating rod has a threaded hole. The screw is screwed into the threaded hole of the rotating rod. The knob forms the aforementioned axial part and radial protrusion. The cover is anti-rotationally connected to the rotating rod.

[0014] As an improvement, a spare blade is provided between the screw and the cap.

[0015] As an improvement, the threaded hole of the sleeve is located near its end furthest from the blade; and / or, The axial length of the threaded section of the sliding sleeve is 1 / 6 to 1 / 2 of the length of the through hole of the sliding sleeve. The part of the through hole of the sliding sleeve other than the threaded section is the smooth shaft section, and the diameter of the smooth shaft section is larger than that of the threaded section.

[0016] As an improvement, the stroke of the elastic element from before compression to just being compressed is less than the axial distance between the protrusion of the cutter body and the elastic element; and / or, A first gasket is provided between the radial protrusions of the elastic element and the control component.

[0017] As an improvement, the elastic element is sleeve-shaped before compression; and / or, The elastic element is a compression spring. The compression spring can be a rubber spring, a disc spring, or other composite type of compression spring.

[0018] As an improvement, the rolling assembly has two sets distributed along the circumference of the pipe to be cut; the rolling assembly includes a pin, multiple bearings mounted on the pin, and retaining rings between the bearings; and / or, The tube cutting assembly includes a pin located on the sliding sleeve near the rolling component. The pin has a cap and a shank. The shank of the pin is provided with a ball screw. The cap and the ball screw of the pin are located on both sides of the sliding sleeve. The blade is rotatably connected to the shank of the pin.

[0019] The beneficial effects of this utility model of a manual pipe cutter with an elastic buffer structure are as follows: When cutting a pipe, first place the pipe to be cut on the rolling assembly, then rotate the control assembly to make the rotating rod rotate and drive the sliding sleeve and the blade on it to move linearly towards the rolling assembly. When the blade touches the pipe to be cut, the sliding sleeve can no longer move. At this time, continue to rotate the control assembly. During the rotation, the rotating rod will move axially away from the blade, thereby driving the control assembly axially away from the blade. During the process of moving away from the blade, the control assembly compresses the elastic element, and applies pre-pressure to the blade through the elastic element, the control assembly, the rotating rod, and the sliding sleeve; the sliding sleeve is reliably guided by the cooperation of the sliding sleeve and the blade body. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the manual pipe cutter according to Embodiment 1 of this utility model.

[0021] Figure 2 This is a cross-sectional view of the manual pipe cutter according to Embodiment 1 of this utility model.

[0022] Figure 3 This is an exploded view of the manual pipe cutter according to Embodiment 1 of this utility model.

[0023] Figure 4 and Figure 5 This is a schematic diagram of the manual pipe cutter body at different angles according to Embodiment 1 of this utility model.

[0024] Figure 6 This is a schematic diagram of the sliding sleeve of the manual pipe cutter according to Embodiment 1 of this utility model.

[0025] Figure 7 This is a schematic diagram of the rotating rod of the manual pipe cutter according to Embodiment 1 of this utility model.

[0026] Figure 8 This is a partial cross-sectional view of the manual pipe cutter according to Embodiment 1 of this utility model.

[0027] In the diagram, 1 is the blade body; 11 is the straight shank; 12 is the curved section; 13 is the through hole; 131 is the guide section; 132 is the rib; 133 is the abutment section; and 134 is the receiving section. 2. Rolling assembly; 21. Pin; 22. Bearing; 23. Retaining ring; 3. Sliding sleeve; 31. Through hole; 311. Threaded section; 32. Guide anti-rotation plane; 4. Pipe cutting assembly; 41. Pin; 42. Blade; 43. Ball screw; 5. End caps; 6. Rotating rod; 61. External threaded part; 62. Abutting part; 63. Threaded hole part; 7. Control components; 71. Knob; 711. Axial part; 712. Radial protrusion; 72. Cap; 73. Spare blade; 74. Screw; 8. Elastic components; 9. Limiting gasket; 10. First gasket. Detailed Implementation

[0028] The technical solutions of the embodiments of the present invention will be explained and described below with reference to the accompanying drawings. However, the following embodiments are only preferred embodiments of the present invention and not all embodiments. Other embodiments obtained by those skilled in the art based on the embodiments in the implementation methods without creative effort are all within the protection scope of the present invention.

[0029] See Figures 1 to 8 The manual pipe cutter with an elastic buffer structure according to this utility model embodiment includes: The blade body has a straight shank and a curved section. The straight shank has a through hole, and the through hole has a guide section. A rolling assembly is installed on the curved portion of the cutter body at the end furthest from the straight shank. The sliding sleeve is located in the through hole and engages with the guide section to prevent rotation. It has a through hole with a threaded section. A tube cutting assembly, including a blade rotatably disposed on a sleeve near the end of a rolling element; End cap, fixed to the outer side of the straight shank of the blade, away from the blade; The rotating rod has an external thread that mates with the threaded section of the sliding sleeve, and its outer end extends out of the end cap; The control assembly, fixedly connected to the rotating rod, includes an axial portion sleeved outside the end cap and a radial protrusion sleeved outside the straight shank portion near the blade end. An elastic element is located between the radial protrusion and the end cap; During pipe cutting, the rolling assembly and the blade clamp the pipe to be cut, and the elastic element is compressed and preload is applied to the sliding sleeve.

[0030] The manual pipe cutter with an elastic buffer structure of this utility model has movable parts including a sliding sleeve, a rotating rod, and a control assembly (the deformation of the elastic element is not considered as movement). When cutting the pipe, the pipe to be cut is first placed on the rolling assembly, and then the control assembly is rotated to make the rotating rod rotate (without axial displacement) and drive the sliding sleeve and the blade on it to move linearly towards the rolling assembly (the blade body prevents the sliding sleeve from rotating). When the blade touches the pipe to be cut, the sliding sleeve can no longer move. At this time, the control assembly is rotated again. During the rotation, the rotating rod will move axially away from the blade, which in turn drives the control assembly to move axially away from the blade. During the process of moving away from the blade, the control assembly compresses the elastic element, and applies pre-pressure to the blade through the elastic element, the control assembly, the rotating rod, and the sliding sleeve; the sliding sleeve is reliably guided by the cooperation of the sliding sleeve and the blade body.

[0031] Example 1 See Figures 1 to 8 The manual pipe cutter with an elastic buffer structure according to Embodiment 1 of this utility model includes: The blade body 1 has a straight shank portion 11 and a curved portion 12. The straight shank portion 11 has a through hole 13, and the through hole 13 has a guide section 131. The rolling assembly 2 is installed at the end of the curved portion 12 of the blade body 1 that is away from the straight shank portion 11; Sliding sleeve 3, located in through hole 13 and anti-rotation fit with guide section 131, has through hole 31, through hole 31 having thread section 311; The tube cutting assembly 4 includes a blade 42 rotatably disposed on the sleeve 3 near the end of the rolling element; End cap 5 is fixed to the outer side of the straight shank 11 of the blade body 1, away from the blade 42. The rotating rod 6 has an external thread 61 that mates with the threaded section 311 of the sliding sleeve 3, and its outer end extends out of the end cap 5; The control assembly 7 is fixedly connected to the rotating rod 6 and includes an axial portion 711 sleeved outside the end cover 5 and a radial protrusion 712 sleeved outside the straight shank portion 11 near one end of the blade 42. The elastic element 8 is located between the radial protrusion 712 and the end cap 5; During pipe cutting, the rolling assembly 2 and the blade 42 clamp the pipe to be cut, and the elastic element 8 is compressed and a preload is applied to the sliding sleeve 3.

[0032] In this embodiment, the rotating rod 6 forms an abutment portion 62, which is located between the end cap 5 and the sliding sleeve 3. Before the elastic member 8 is compressed, there is a gap between the abutment portion 62 of the rotating rod 6 and the end cap 5.

[0033] In this embodiment, the through hole 13 of the blade body 1 forms a guide section 131, an abutment section 133, and a receiving section 134. The abutment portion 62 is located between the receiving section 134 and the guide section 131. A limiting gasket 9 is also provided in the receiving section 134, and the limiting gasket 9 is located between the abutment portion 62 and the end wall of the abutment section 133 of the blade body 1. The limiting gasket 9 can abut against the blade body 1, restricting the initial position of the rotating rod 6, the sliding sleeve 3, the tube cutting assembly 4, etc. before tube cutting, preventing the operating components from being subjected to force at the beginning, making the rotation smoother, and also preventing the blade 42 and the rolling assembly 2 from getting too close.

[0034] In this embodiment, the end cap 5 is threadedly connected to the straight shank portion 11 of the blade body 1.

[0035] In this embodiment, multiple circumferentially distributed ribs 132 extend from the guide section 131 of the through hole 13 of the cutter body 1, and the outer surface of the sliding sleeve 3 has four guide anti-rotation planes 32. The multiple ribs 132 form four planes that cooperate with the guide anti-rotation planes 32. By setting the ribs 132, the frictional contact area between the cutter body 1 and the sliding sleeve 3 is reduced, thereby reducing friction.

[0036] In this embodiment, the control assembly 7 includes a knob 71, a cap 72, and a screw 74. The knob 71 and the cap 72 are threaded together. The outer end of the rotating rod 6 has a screw hole 63. The screw 74 is screwed into the screw hole 63 of the rotating rod 6. The knob 71 forms the aforementioned axial portion 711 and radial protrusion 712. The control assembly 7 is composed of multiple parts, which facilitates the assembly between the control assembly 7 and the blade body 1.

[0037] In this embodiment, the screw cap 72 is connected to the rotating rod 6 to prevent rotation and form a limiting structure, and there is a gap between the screw cap 72 and the end cap 5.

[0038] In this embodiment, a spare blade 7342 is provided between the screw 74 and the cap 72.

[0039] In this embodiment, the threaded hole of the sliding sleeve 3 is located near the end of it away from the blade 42.

[0040] In this embodiment, the axial length of the threaded section 311 of the sliding sleeve 3 is 1 / 6 to 1 / 2 of the length of the through hole 31 of the sliding sleeve 3. The portion of the through hole 31 of the sliding sleeve 3 other than the threaded section 311 is a smooth shaft section, and the diameter of the smooth shaft section is larger than that of the threaded section 311. By reducing the axial length of the threaded section 311 of the sliding sleeve 3, the machining difficulty is reduced.

[0041] In this embodiment, the stroke of the elastic element 8 from before compression to just after compression is less than the axial distance between the protrusion of the blade body 1 and the elastic element. That is... Figure 2 The axial gap between the elastic element 8 and the end cap 5 is less than the axial distance between the protrusion of the blade body 1 and the elastic body. When the elastic element 8 is compressed to a sufficient degree, there is still or just no gap between the protrusion of the blade body 1 and the elastic body, thereby ensuring that the elastic element 8 can be compressed to a sufficient degree.

[0042] In this embodiment, a first gasket 10 is provided between the elastic element 8 and the radial protrusion 712 of the control component 7 to facilitate production and installation.

[0043] In this embodiment, the elastic element 8 is in the shape of a sleeve before being compressed. In other embodiments, the elastic element 8 may also be a compression spring.

[0044] In this embodiment, there are two sets of rolling components 2, which are distributed along the circumferential direction of the pipe to be cut; the rolling components 2 include a pin 21, a plurality of bearings 22 disposed on the pin 21, and a retaining ring 23 between the bearings 22.

[0045] In this embodiment, the tube cutting assembly 4 includes a pin 41 located at one end of the sliding sleeve 3 near the rolling assembly 2. The pin 41 has a cap and a rod. The rod of the pin 41 is provided with a ball screw 43. The cap of the pin 41 and the ball screw 43 are located on both sides of the sliding sleeve 3. The blade 42 is rotatably connected to the rod of the pin 41.

[0046] In this embodiment, during assembly, the rolling assembly 2 is first assembled with the blade body 1, then the sliding sleeve 3 assembly is placed into the through hole 13 of the blade body 1, the tube cutting assembly 4 is assembled with the sliding sleeve 3 (or can be assembled last), the limiting shim 9 is placed in, then the rotating rod 6 is screwed into the sliding sleeve 3, then the knob 71, the first shim 10 and the elastic element 8 are sequentially placed on the outside of the blade body 1, the end cap 5 is screwed onto the blade body 1, the anti-rotation surface of the cap 72 is aligned with the anti-rotation surface of the rotating rod 6, the cap 72 and the knob 71 are screwed together, and finally the cap 72, the spare blade 7342 and the rotating rod 6 are screwed together with the screw 74.

[0047] In this embodiment, in the initial state, the abutting part 62 of the rotating rod 6 is supported by the blade body 1 through the limiting pad 9. The axial gap between the elastic element 8 and the end cap 5 is smaller than the axial distance between the protrusion of the blade body 1 and the elastic element. There is an axial gap between the screw cap 72 and the end cap 5. There is a radial gap between the screw hole part 63 of the rotating rod 6 and the end cap 5. When cutting the pipe, the pipe to be cut is first placed on the rolling assembly 2 and supported by the rolling assembly 2. Then, the knob 71 of the control assembly 7 is rotated to make the rotating rod 6 rotate and drive the sliding sleeve 3 and the blade 42 on it to move linearly towards the rolling assembly 2. When the blade 42 comes into contact with the pipe to be cut, the sliding sleeve 3 can no longer move. At this time, the control assembly 7 is rotated again. During the rotation, the rotating rod 6 will move axially away from the blade 42, thereby driving the control assembly 7 to move axially away from the blade 42. During the process of moving away from the blade 42, the control assembly 7 compresses the elastic element 8. The elastic element 8 applies pre-pressure to the blade 42 through the knob 71, the screw cap 72, the screw 74, the rotating rod 6 and the sliding sleeve 3.

[0048] The beneficial effects of the manual pipe cutter with elastic buffer structure in Embodiment 1 of this utility model are as follows: When cutting a pipe, the pipe to be cut is first placed on the rolling assembly 2, and then the control assembly 7 is rotated to make the rotating rod 6 rotate and drive the sliding sleeve 3 and the blade 42 thereon to move linearly towards the rolling assembly 2. When the blade 42 touches the pipe to be cut, the sliding sleeve 3 can no longer move. At this time, the control assembly 7 is rotated again, and the rotating rod 6 will move axially away from the blade 42 during the rotation, thereby driving the control assembly 7 to move axially away from the blade 42. During the process of moving away from the blade 42, the control assembly 7 compresses the elastic element 8. The elastic element applies pre-pressure to the blade 42 through the knob 71, the cap 72, the screw 74, the rotating rod 6 and the sliding sleeve 3, and the pre-pressure is reliable. The sliding sleeve 3 is reliably guided by the cooperation between the sliding sleeve 3 and the blade body 1. The blade body 1 forms a rib 132, which reduces the friction between the blade body 1 and the sliding sleeve 3 and can also reduce the amount of material used.

[0049] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Those skilled in the art should understand that the present invention includes, but is not limited to, the content described in the above specific embodiments. Any modifications that do not depart from the functional and structural principles of the present invention will be included within the scope of the claims.

Claims

1. A manual pipe cutter with an elastic buffer structure, characterized in that: Manual pipe cutters with elastic buffer structures include: The blade body (1) has a straight shank (11) and a curved section (12). The straight shank (11) has a through hole (13) and the through hole (13) has a guide section (131). A rolling assembly (2) is installed on the end of the curved part (12) of the blade body (1) away from the straight shank part (11); The sliding sleeve (3) is located in the through hole (13) and is anti-rotationally engaged with the guide section (131). It has a through hole (31) with a threaded section (311). The tube cutting assembly (4) includes a blade (42) rotatably disposed on the sleeve (3) near the end of the rolling element. The elastic element (8) is located outside the straight handle portion (11); During pipe cutting, the rolling assembly (2) and the blade (42) clamp the pipe to be cut, and the elastic element (8) is compressed and pre-pressure is applied to the sliding sleeve (3).

2. The manual pipe cutter with elastic buffer structure according to claim 1, characterized in that: The manual pipe cutter with elastic buffer structure also includes: End cap (5) is fixed to the outside of the straight shank (11) of the blade body (1) away from the blade (42); The rotating rod (6) has an external thread (61) that mates with the threaded section (311) of the sliding sleeve (3), and the outer end extends out of the end cap (5). The control assembly (7), which is fixed to the rotating rod (6), includes an axial portion (711) sleeved outside the end cap (5) and a radial protrusion (712) sleeved outside the straight shank portion (11) near the end of the blade (42). The elastic element (8) is located between the radial protrusion (712) and the end cap (5).

3. The manual pipe cutter with elastic buffer structure according to claim 2, characterized in that: The rotating rod (6) forms an abutment part (62), which is located between the end cap (5) and the sliding sleeve (3). Before the elastic member (8) is compressed, there is a gap between the abutment part (62) of the rotating rod (6) and the end cap (5).

4. The manual pipe cutter with elastic buffer structure according to claim 3, characterized in that: The through hole (13) of the blade body (1) forms a guide section (131), an abutment section (133), and a receiving section (134). The abutment part (62) is located between the receiving section (134) and the guide section (131). A limiting gasket (9) is also provided in the receiving section (134). The limiting gasket (9) is located between the abutment part (62) and the end wall of the abutment section (133) of the blade body (1); and / or, The end cap (5) is threaded to the straight shank (11) of the blade body (1).

5. The manual pipe cutter with elastic buffer structure according to claim 4, characterized in that: Multiple ribs (132) are extended in the guide section (131) of the through hole (13) of the blade body (1) and distributed in a circumferential direction. The outer surface of the sliding sleeve (3) has four guide anti-rotation planes (32). The multiple ribs (132) form four planes that cooperate with the guide anti-rotation planes (32).

6. The manual pipe cutter with an elastic buffer structure according to claim 2, characterized in that: The control assembly (7) includes a knob (71), a cover (72) and a screw (74). The knob (71) and the cover (72) are threaded together. The outer end of the rotating rod (6) has a screw hole (63). The screw (74) is screwed into the screw hole (63) of the rotating rod (6). The knob (71) forms the aforementioned axial part (711) and radial protrusion (712). The cover (72) is anti-rotationally connected to the rotating rod (6).

7. The manual pipe cutter with elastic buffer structure according to claim 6, characterized in that: A spare blade (73) is provided between the screw (74) and the cap (72).

8. The manual pipe cutter with elastic buffer structure according to claim 1, characterized in that: The threaded hole of the sleeve (3) is adjacent to the end of the sleeve that is furthest from the blade (42); and / or, The axial length of the threaded section (311) of the sliding sleeve (3) is 1 / 6 to 1 / 2 of the length of the through hole (31) of the sliding sleeve (3). The part of the through hole (31) of the sliding sleeve (3) other than the threaded section (311) is the optical axis section. The diameter of the optical axis section is larger than that of the threaded section (311).

9. The manual pipe cutter with elastic buffer structure according to claim 1, characterized in that: The stroke of the elastic element (8) from before compression to just after compression is less than the axial distance between the protrusion of the cutter body (1) and the elastic element; and / or, A first gasket (10) is provided between the radial protrusion (712) of the elastic element (8) and the control assembly (7); and / or, The elastic element (8) is in the shape of a sleeve before being compressed; and / or, The elastic element (8) is a compression spring.

10. The manual pipe cutter with elastic buffer structure according to claim 1, characterized in that: The rolling assembly (2) has two sets and is distributed along the circumference of the pipe to be cut; the rolling assembly (2) includes a pin (21), a plurality of bearings (22) disposed on the pin (21), and retaining rings (23) between the bearings (22); and / or, The tube cutting assembly (4) includes a pin (41) located on the end of the sliding sleeve (3) near the rolling assembly (2). The pin (41) has a cap and a rod. The rod of the pin (41) is provided with a ball screw (43). The cap of the pin (41) and the ball screw (43) are located on both sides of the sliding sleeve (3). The blade (42) is rotatably connected to the rod of the pin (41).

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