Pipe cutter

Abstract

The utility model discloses a pipe cutter, which belongs to the technical field of cutting tools and comprises a first shell and a second shell, one end of the first shell is connected with one end of the second shell, the other end of the first shell is close to the other end of the second shell to form a cutting space, and a blade arranged on the first shell and a roller arranged on the second shell are arranged in the cutting space. And the distance between the blade and the roller is adjustable. According to the scheme, the first shell and the second shell contain the blade and the rolling wheel correspondingly, the distance between the blade and the rolling wheel in the first shell and the second shell can be adjusted, the blade and the rolling wheel are made to be close to each other or away from each other, and therefore the caliber of the cutting knife is adjusted, pipe cutting of different sizes and specifications is achieved, operation is easy and convenient, and practicability is high. And the applicability is wider.

Description

Technical Field

[0001] The utility model relates to a pipe cutting tool, more particularly to a pipe cutting knife. Background Art

[0002] A pipe cutter is a tool for cutting pipes, which is portable and easy to use. However, existing pipe cutters can only be used for pipes of one diameter, have a relatively single function, and have poor applicability. In addition, the use process is relatively complicated.

[0003] For example: Chinese patent publication number CN215358546, publication date December 31, 2021, the name of the utility model is a convenient pipe cutter, the application discloses a pipe cutter tool, including a housing and a push knife assembly and a blade installed in the housing, the push knife assembly includes a drive column and a drive shaft connected to the drive column, the blade is fixed to the end of the drive column, a slide rail corresponding to the drive column is provided in the housing, and the drive column is slidably installed in the slide rail. This solution can automatically cut the pipe fittings, which has the advantages of saving time and effort and having a good cutting effect, but this solution can only cut pipes of a single specification and has poor applicability. Utility Model Content

[0004] The utility model overcomes the problem of poor applicability of existing pipe cutters and provides a pipe cutter. In this solution, the pipe cutter has multiple assembly nodes, which can adjust the size of the cutter diameter and adapt to pipes of various specifications, and has wider applicability.

[0005] To address the aforementioned technical issues, the present invention employs the following technical solution: a pipe cutter comprising a first housing and a second housing, the first and second housings being connected at one end and brought together at the other ends to form a cutting space. A blade disposed on the first housing and a roller disposed on the second housing are disposed within the cutting space, the distance between the blade and the roller being adjustable. In this solution, the first and second housings respectively house the blade and the roller, and the distance between the blade and the roller within the first and second housings can be adjusted so that the blade and the roller move closer or further apart, thereby adjusting the diameter of the cutter to achieve cutting of pipes of varying sizes. This solution provides simple and convenient operation and a wide range of applicability.

[0006] Preferably, the first and second housings are slidably connected, and the distance between the blade and the roller is adjustable by adjusting the distance between the first and second housings. The roller can be moved toward or away from the blade, and by changing the distance between the roller and the blade, a variety of cutting diameters can be achieved.

[0007] Preferably, at least two positional nodes are defined between the first and second housings. These positional nodes are arranged adjacent to and connected to each other. The first and second housings are connected by a stepped shaft that mates with the positional nodes. The blade is rotatably connected to the interior of the first housing, and the roller is rotatably connected to the interior of the second housing, with the blade's rotational axis parallel to the roller's rotational axis. The adjacent and connected positional nodes allow for adjustment of the relative position between the first and second housings without completely separating them. Specifically, the stepped shaft serves as the fixed axis between the first and second housings, and the stepped shaft can be moved and repositioned at different positional nodes to adjust and fix the relative position of the first and second housings. During the pipe cutting process, both the blade and the roller rotate, achieving rotational cutting of the pipe, resulting in a smoother cut. The blade and roller axes are parallel to each other, forming a three-point contact between the two rollers and the blade and the pipe, ensuring a stable grip of the pipe.

[0008] Preferably, a first elastic member is disposed within the first housing, the first elastic member abutting against the blade, the edge of the blade protruding from the outside of the first housing. A blade is disposed within the first housing, and thus a first elastic member is also required within the first housing to abut against the blade in an initial state and ensure that the edge of the blade protrudes from the outside of the first housing, thereby ensuring that the blade can perform cutting operations normally.

[0009] Preferably, a second elastic member is further disposed within the first housing, and abuts against the blade's rotating shaft. The second elastic member is a leaf spring structure, which can also abut against the blade's rotating shaft. When the blade cuts the pipe, the blade moves a small distance into the first housing, and the leaf spring applies pressure to the blade's rotating shaft, thereby causing the blade to exert a squeezing force on the pipe, pushing the blade to reach a certain cutting depth, thereby completing the pipe cutting.

[0010] Preferably, a blade shaft positioning hole is provided on the first housing, and a limit plate is provided on the blade shaft positioning hole, and the limit plate is rotatably connected to the blade shaft positioning hole. The blade shaft positioning hole is used to position the blade so that the blade can be within a certain effective range. In order to prevent the blade from jumping or displacing along the axial direction of its shaft, a limit plate is further provided on the first housing to abut the end of the blade shaft, and the limit plate is fixed to the housing by a rotational connection. When the limit plate rotates to be flush with the surface of the first housing, the end of the blade shaft is limited. When the limit plate rotates to a position not flush with the surface of the first housing, the blade shaft can be freely moved axially, so that the blade can be replaced at this time, making the operation of replacing the blade more convenient and simple.

[0011] Preferably, a third elastic member is sleeved on the stepped shaft. The third elastic member can be a spring structure, which is used to limit the stepped shaft and ensure that the stepped shaft does not move axially at the position node, resulting in failure to use the pipe cutter normally.

[0012] Preferably, the first shell is a detachable structure. Since the first shell has many structures inside, in order to facilitate the installation of the structures inside the first shell, the first shell can be composed of upper and lower halves, which greatly facilitates the assembly of structures such as the blade and elastic parts, and also facilitates subsequent inspection and maintenance.

[0013] Preferably, a gap is provided between the axial ends of the blade and the first housing. Since the blade needs to rotate during use and the edge of the blade needs to protrude outside the first housing, maintaining a certain gap between the blade and the first housing can prevent friction between the blade and the first housing, which may cause wear on the blade or the housing.

[0014] Preferably, a limit block is further provided in the first housing, and the limit block is provided at a position corresponding to the rotation axis of the limit plate. The limit block can limit the rotation axis of the limit plate to prevent the limit plate from rotating ineffectively.

[0015] Compared with the prior art, the beneficial effects of the present invention are: (1) the pipe cutter is more convenient and simple to use, and the cut of the pipe is smoother; (2) the pipe cutter has multiple assembly nodes, which can adjust the size of the cutter diameter and adapt to pipes of various specifications, and has a wider applicability; (3) it is easy to inspect and maintain, the blade can be replaced, and the shell can be disassembled to inspect the internal structure, and the service life is longer. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is the main view of the utility model.

[0017] Figure 2 This is the axonometric drawing of the utility model.

[0018] Figure 3 This is a schematic diagram of the internal structure assembly of the first shell of the present invention.

[0019] Figure 4 This is a top view of the internal structure of the first shell of the present invention.

[0020] Figure 5 This is an exploded schematic diagram of the internal structure of the second shell of the present invention.

[0021] Figure 6 This is an axonometric drawing of the present invention in another size specification state.

[0022] Figure 7 This is a front view of the utility model in another size specification state.

[0023] Figure 8 for Figure 7 Cross-sectional view along the AA direction.

[0024] Figure 9 This is the axonometric drawing of this new stepped shaft.

[0025] Figure 10 This is a schematic diagram of the limit plate of the utility model in the open state.

[0026] In the figure: 1. First shell, 1.1. Upper shell, 1.11. Upper connecting part, 1.2. Lower shell, 1.21. Lower connecting part, 2. Second shell, 3. Blade, 3.1. Blade shaft, 3.2. Thickened part, 4. Roller, 4.1. Roller positioning hole, 5. Position node, 6. Step shaft, 7. First elastic member, 8. Blade shaft positioning hole, 9. Limiting plate, 10. Third elastic member, 11. Second elastic member, 11.1. Leaf spring slot, 11.2. Fulcrum, 12. Limiting block, 13. Long round hole, 14. Connecting hole, 15. Positioning hole. DETAILED DESCRIPTION

[0027] The technical solution of the present invention will be further described below with reference to specific embodiments and in conjunction with the accompanying drawings.

[0028] Example 1: Figures 1 to 9 The pipe cutter shown in the figure comprises a first shell 1 and a second shell 2. Both the first shell 1 and the second shell 2 are approximately semicircular in shape. The ends of the first shell 1 and the second shell 2 are connected together to form a node 5, forming a roughly circular structure. Both the first shell 1 and the second shell 2 have hollow interiors. Between the first shell 1 and the second shell 2, away from the node 5, is a concave arc-shaped structure for accommodating pipes.

[0029] The first housing 1 is provided with a blade 3 structure, and the second housing 2 is provided with a roller 4 structure. Figure 3As shown, the first shell 1 is a detachable structure divided into upper and lower halves, consisting of an upper shell 1.1 and a lower shell 1.2. A blade 3 structure is also provided inside the first shell 1. Specifically, the blade 3 has a blade shaft 3.1. The blade 3 is located in the middle of the blade shaft 3.1 and thickened portions 3.2 are provided at both ends of the blade 3. The thickened portions 3.2 can enhance the fixing strength of the blade 3. A blade shaft positioning hole 8 is provided at the concave arc-shaped opening position on the upper shell 1.1 and the lower shell 1.2, and the two ends of the blade shaft 3.1 are respectively located in the two blade shaft positioning holes 8. Among them, the aperture of the blade shaft positioning hole 8 is slightly smaller than the radial dimension of the blade shaft 3.1, so that the blade shaft positioning holes 8 on the upper shell 1.1 and the lower shell 1.2 can limit the blade shaft 3.1 in the axial direction. The surface of the second housing 2 is provided with two pairs of roller positioning holes 4.1, each located on two opposing surfaces of the second housing 2. The roller 4 has two locating shafts at either end that engage with the roller positioning holes 4.1. Once assembled on the second housing 2, the roller 4 can rotate about its own axis, facilitating easier rotation (either of the pipe or of the pipe cutter) during pipe cutting. The two rollers 4 are spaced apart to accommodate the pipe structure. The rotating axes of the two rollers 4 and the blade 3 are parallel to each other, creating a three-point contact between the two rollers 4 and one blade 3. This three-point contact ensures a stable grip on the pipe.

[0030] An upper connecting portion 1.11 is provided at one end of the upper shell 1.1. The upper connecting portion 1.11 is a relatively flat structure. An oblong hole 13 structure is provided on the upper connecting portion 1.11. A lower connecting portion 1.21 is provided at one end of the lower shell 1.2 corresponding to the upper connecting portion 1.11 of the first shell 1. The lower connecting portion 1.21 is adapted to the upper connecting portion 1.11. Two connecting holes 14 are provided on the lower connecting portion 1.21. The two connecting holes 14 are connected together to form an "8"-shaped structure. When the upper shell 1.1 and the lower shell 1.2 are assembled together, the oblong hole 13 corresponds to the positions of the two connecting holes 14.

[0031] There are two position nodes 5 between the first shell 1 and the second shell 2. Specifically, Figure 3 、 Figure 4 as well as Figure 5As shown, a stepped shaft 6 is disposed within the two connecting holes 14 and the oblong hole 13 on the first housing 1. The stepped shaft 6 is inserted into one of the connecting holes 14 and also fits within the oblong hole 13. Because the radial dimensions of the stepped shaft 6 are different and the two connecting holes 14 are connected, the position of the stepped shaft 6 within the two connecting holes 14 can be adjusted, thereby enabling the position of the stepped shaft 6 to be switched. Specifically, when the position of the stepped shaft 6 needs to be switched, the thin portion of the stepped shaft 6 (the portion with the smaller radial dimension of the stepped shaft 6) is moved to the connecting point between the two connecting holes 14. The stepped shaft 6 can then be moved from the connecting point between the two connecting holes 14 to the other connecting hole 14. The thick portion of the stepped shaft 6 (the portion with the larger radial dimension of the stepped shaft 6) is then moved into the connecting hole 14, securing the stepped shaft 6 within the connecting hole 14. This allows the stepped shaft 6 to be adjusted within the connecting hole 14. The oblong hole 13 of the upper housing 1.1 does not interfere with the movement of the stepped shaft 6.

[0032] It should be noted that in this solution, the connection hole 14 is provided in the lower shell 1.2, and the oblong hole 13 is provided in the upper shell 1.1. In addition to the above arrangement, the connection hole 14 can also be provided in the upper shell 1.1, and the oblong hole 13 can also be provided in the lower shell 1.2. In addition, in this solution, two types of holes are provided in the first shell 1: one is an oblong hole 13, and the other is two connecting holes 14 connected together. In addition to the above arrangement, a unified arrangement of two connecting holes 14 connected together can also be provided, that is, two connecting holes 14 are provided in both the upper shell 1.1 and the lower shell 1.2, and the two connecting holes 14 are connected together. This arrangement also allows the stepped shaft 6 to be adjusted in position within the connecting hole 14 without being completely disassembled.

[0033] The interior of the second shell 2 is a hollow structure, and two positioning holes 15 are provided on the surface of the second shell 2. The two positioning holes 15 are respectively provided on two opposite surfaces of the second shell 2, and the positions of the two positioning holes 15 correspond to each other. In the first shell 1, the upper connecting portion 1.11 of the upper shell 1.1 has a surface lower than the surface of the upper shell 1.1, making the size and thickness of the upper connecting portion 1.11 smaller; the lower connecting portion 1.21 of the lower shell 1.2 has a surface lower than the surface of the lower shell 1.2, making the size and thickness of the lower connecting portion 1.21 smaller. When the upper shell 1.1 and the lower shell 1.2 are assembled together, the overall size of the connecting portion composed of the upper connecting portion 1.11 and the lower connecting portion 1.21 is also smaller than the thickness of the first shell 1, so that the connecting portion of the first shell 1 can be assembled inside the second shell 2, and the surfaces of the first shell 1 and the second shell 2 are flush with each other, making the entire pipe cutter surface smoother. After the first shell 1 and the second shell 2 are assembled together, the positioning hole 15 on the second shell 2 corresponds to the connection hole 14 on the first shell 1, and the stepped shaft 6 connects the first shell 1 and the second shell 2. When the position of the stepped shaft 6 is adjusted in the two connection holes 14, the relative position between the first shell 1 and the second shell 2 can be adjusted, thereby realizing the distance between the roller 4 and the blade 3 to adapt to the cutting of pipes of different specifications.

[0034] Since the connecting portion of the first shell 1 is a relatively straight structure and has a certain length, the first shell 1 and the second shell 2 can only slide (translate) relative to each other along the length direction of the connecting portion, so that the blade 3 on the first shell 1 and the roller 4 on the second shell 2 are close to or away from each other, thereby realizing the adjustment of the cutting size.

[0035] In this embodiment, the stepped shaft 6 can be specifically a stepped bolt. A third elastic member 10 is also provided on the stepped shaft 6. The third elastic member 10 is a telescopic spring structure. The spring is sleeved on the shaft portion of the stepped shaft 6. The end dimension of the stepped shaft 6 is larger than the radial dimension of the shaft portion. As a result, one end of the spring abuts the end of the stepped shaft 6, and the other end abuts the first housing 1. The third elastic member 10 can achieve a reset operation of the stepped shaft 6. Specifically, in the initial state, the thick part of the stepped shaft 6 is located in the connecting hole 14, the first shell 1 and the second shell 2 are relatively fixed, the stepped shaft 6 is pressed, the third elastic member 10 is compressed, the thick part of the stepped shaft 6 is out of the connecting hole 14, and the thin part enters the connecting hole 14, and then the first shell 1 and the second shell 2 are pulled or pushed away from each other or close to each other, so that the stepped shaft 6 moves from one connecting hole 14 to another connecting hole 14, and then the stepped shaft 6 is released, and the stepped shaft 6 returns to its position under the elastic force of the third elastic member 10, so that the thick part of the stepped shaft 6 returns to the connecting hole 14, thereby achieving the fixation of the first shell 1 and the second shell 2.

[0036] A first elastic member 7 is also provided in the lower shell 1.2. The first elastic member 7 is a curved long elastic structure. A groove structure is provided in the lower shell 1.1 for installing the first elastic member 7. Specifically, one end of the first elastic member 7 is in contact with the thickened portion 3.2 of the blade 3 structure, and the other end of the first elastic member 7 is arranged around the lower connecting portion 1.21 of the lower shell 1.2, so that the first elastic member 7 is fixed at the position of the lower connecting portion 1.21, and the middle part of the first elastic member 7 is provided as a curved arc structure, so that the end of the first elastic member 7 can also press the blade 3, so that the blade 3 is pressed against the inner wall of the concave arc-shaped opening of the first shell 1, which plays a certain limiting role on the blade 3.

[0037] In addition, a second elastic member 11 structure is provided in the upper shell 1.1 and the lower shell 1.2. The second elastic member 11 is a leaf spring. The two second elastic members 11 structures are respectively arranged at both ends of the blade shaft 3.1. Specifically, Figure 3 and Figure 4 As shown, a leaf spring slot 11.1 structure for accommodating the second elastic member 11 is further provided inside the upper shell 1.1 and the lower shell 1.2. The leaf spring slot 11.1 structure and the blade shaft positioning hole 8 are integrated, so that the blade 3 can move toward the inside of the first shell 1 in the blade shaft positioning hole 8 to facilitate the cutting work of the blade 3; the second elastic member 11 (leaf spring) structure is a curved plate structure, and the leaf spring slot 11.1 is also a curved slot, but the curvature of the second elastic member 11 and the leaf spring slot 11.1 are different. The curvatures are different. One end of the second elastic member 11 is located at the connecting portion of the first shell 1, and the other end of the second elastic member 11 is close to the blade shaft positioning hole 8. The second elastic member 11 is fixed at the connecting portion. The end of the second elastic member 11 close to the blade shaft positioning hole 8 is a movable portion, and when the pipe cutter is not in use, the second elastic member 11 remains separated from the blade shaft 3.1, and the middle part of the second elastic member 11 abuts against the inner wall of the leaf spring slot 11.1 to form a fulcrum 11.2.

[0038] When the pipe cutter is not in use, only the first elastic member 7 abuts the blade 3, keeping the blade 3 relatively fixed in position. The second elastic member 11 maintains a certain distance from the blade 3. When the pipe cutter is in use, the pipe is located between the blade 3 and the roller 4, squeezing the blade 3. As a result, the blade 3 moves along the excess space in the blade shaft positioning hole 8 and is squeezed by the second elastic member 11. This second elastic member 11 generates an elastic squeezing force on the blade 3, pressing the blade 3 against the surface of the pipe, making it easier for the blade 3 to cut the pipe.

[0039] The second elastic member 11 has a different function from the first elastic member 7. The elastic force of the first elastic member 7 is smaller than that of the second elastic member 11. The first elastic member 7 can make the blade 3 press against the pipe to prevent the pipe from being displaced relative to the cutting knife; the second elastic member 11 can drive the blade 3 to cut. Specifically, the second elastic member 11 (leaf spring) applies elastic pressure to the blade 3, so that the blade has sufficient pressure to cut the pipe. At the same time, due to the elastic force of the second elastic member 11, the blade shaft 3.1 has a certain amount of movable margin during the cutting process, so the cut surface of the pipe will be relatively flat and free of burrs.

[0040] It should also be noted that the blade 3 is between the upper shell 1.1 and the lower shell 1.2, exposed to the outside of the first shell 1, and between the first shell 1 and the second shell 2. Specifically, the thickened portion 3.2 of the blade 3 protrudes from the outside of the first shell 1, and in order to prevent the upper shell 1.1 and the lower shell 1.2 from clamping the blade 3, there is a clearance fit between the thickened portion 3.2 and the upper shell 1.1 and the lower shell 1.2, so that the blade 3 can rotate normally inside the first shell 1.

[0041] On the first housing 1, a limit plate 9 is provided at the position corresponding to the blade shaft positioning hole 8. The limit plate 9 can cover the surface of the blade shaft positioning hole 8 and be flush with the surface of the first housing 1. Specifically, the limit plate 9 is connected to the first housing 1 in a rotational manner. Figure 8 and Figure 9 As shown, when the limit plate 9 rotates to be level with the surface of the first shell 1, the end of the blade shaft 3.1 is limited. When the limit plate 9 rotates to a position that is not level with the surface of the first shell 1, the blade shaft 3.1 can be freely moved axially, so that the blade 3 can be replaced at this time, making the operation of replacing the blade 3 more convenient and simple.

[0042] A limit block 12 is also provided inside the first housing 1. The limit block 12 is provided at the position of the limit plate 9 and is used to limit the bottom of the limit plate 9. Figure 8 As shown, the limit block 12 is an L-shaped structure, one end of which is fixed to the inside of the first housing 1 by a screw, and the other end abuts against the lower part of the rotation axis of the limit plate 9. When the limit plate 9 rotates, it can be more stable and prevent the limit plate 9 from separating from the first housing 1.

[0043] When the pipe cutter is used, the pipe is first placed in the concave arc-shaped opening of the first shell 1 and the second shell 2, so that the blade 3 and the two rollers 4 are in contact with the pipe. At this time, the second elastic member 11 and the first elastic member 7 will apply an extrusion force to the blade 3, so that the blade 3 presses the pipe tightly. Then the user only needs to rotate the pipe cutter or rotate the pipe to cut the pipe.

Claims

1. A pipe cutter, characterized in that: It includes a first shell and a second shell, one end of the first shell and the second shell are connected to each other, and the other ends are close to each other to form a cutting space, and a blade provided on the first shell and a roller provided on the second shell are arranged in the cutting space, and the distance between the blade and the roller is adjustable; the first shell and the second shell are slidably connected, and the distance between the blade and the roller is adjustable by adjusting the distance between the first shell and the second shell.

2. A pipe cutter according to claim 1, characterized in that: At least two position nodes are provided between the first shell and the second shell, and the position nodes are arranged adjacent to and connected to each other. The first shell and the second shell are connected by a stepped shaft adapted to the position nodes; the blade is rotatably connected to the inside of the first shell, and the roller is rotatably connected to the inside of the second shell, and the rotating axis of the blade is parallel to the rotating axis of the roller.

3. A pipe cutter according to claim 1 or 2, characterized in that: A first elastic member is disposed in the first shell, the first elastic member abuts against the blade, and an edge of the blade protrudes from the outside of the first shell.

4. A pipe cutter according to claim 3, characterized in that: A second elastic member is further provided in the first shell, and the second elastic member abuts against the rotating shaft of the blade.

5. A pipe cutter according to claim 3, characterized in that: A blade shaft positioning hole is provided on the first shell, a limiting plate is provided on the blade shaft positioning hole, and the limiting plate is rotatably connected to the blade shaft positioning hole.

6. A pipe cutter according to claim 2, characterized in that: A third elastic member is sleeved on the stepped shaft.

7. A pipe cutter according to claim 1 or 2, characterized in that: The first shell is a structure that can be disassembled in half.

8. A pipe cutter according to claim 7, characterized in that: Gaps are provided between the axial ends of the blade and the first housing.

9. A pipe cutter according to claim 5, characterized in that: A limiting block is further provided in the first shell, and the limiting block is provided at a position corresponding to the rotation axis of the limiting plate.

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