A tool for cutting small diameter pipe liners

Abstract

The utility model belongs to the processing technical field of small diameter pipeline with lining, especially relates to a tool for cutting small pipe diameter pipeline lining, which comprises a base, a cutting assembly detachably installed on the base, the cutting assembly being used for ring cutting the pipeline with plastic lining, a supporting mechanism assembled on the sidewall of the base, and the pipeline with plastic lining being supported on the supporting mechanism. The cutting assembly provided on the base not only realizes the ring cutting function of the pipeline with plastic lining, meets the core requirement of cutting the small pipe diameter pipeline lining, but also is detachable, so that the cutting part can be replaced, maintained or cleaned in the later period, the overall service life of the tool is prolonged, and the supporting mechanism assembled on the sidewall of the base can stably support the pipeline with plastic lining and allow the pipeline to rotate relative to the supporting mechanism, so as to provide stable and adjustable operating conditions for the ring cutting operation and ensure uniform cutting track.

Description

Technical Field

[0001] This utility model belongs to the field of processing technology for small-diameter pipes with linings, and particularly relates to a tool for cutting the lining of small-diameter pipes. Background Technology

[0002] Currently, in the field of small-diameter pipeline processing with liners, small-diameter pipelines (usually referring to pipelines with an inner diameter of less than 50mm) are widely used in industries such as chemical, water treatment, and gas transmission because they combine the structural strength of the pipeline body with the corrosion resistance and leak-proof properties of the lining. The linings of these pipelines are mostly made of plastic materials (such as polyethylene, polytetrafluoroethylene, etc.). In actual installation, maintenance, or modification processes, it is often necessary to perform precise circumferential cutting on the pipeline lining to meet the needs of pipeline connection, port sealing, or partial replacement. Therefore, the cutting accuracy and ease of operation of small-diameter pipeline linings directly affect the stable operation of the subsequent pipeline system. However, the current cutting operations for small-diameter pipeline linings still face many technical challenges, and existing solutions are difficult to meet actual processing needs.

[0003] Among them, the existing method of manually cutting the plastic by inserting a small knife into the pipe is prone to problems such as inaccurate plastic cutting dimensions, uneven end faces, and excessive burrs. The solution of using an electric drill for cutting also has the same problems of inaccurate cutting dimensions, excessive burrs on the end face, and even damage to the metal conduit when the small knife is too sharp, or the small knife is too dull, causing the plastic to be unable to be cut or to curl up and roll inward, resulting in the scrapping of the pipe.

[0004] To address this issue, we propose a tool for cutting the lining of small-diameter pipes. Utility Model Content

[0005] The purpose of this utility model is to address the aforementioned technical problems by providing a tool for cutting the inner lining of small-diameter pipes, thereby improving cutting accuracy.

[0006] In view of this, the present invention provides a tool for cutting the inner lining of small-diameter pipes, comprising: a base, on which a cutting component is detachably mounted, the cutting component being used for circumferentially cutting the pipe with a plastic inner lining; a support mechanism is mounted on the side wall of the base, the pipe with the plastic inner lining is supported on the support mechanism, and the pipe with the plastic inner lining is rotatable relative to the support mechanism; a first screw hole is provided through the bottom of the base, and a pressing component is installed in the first screw hole, the pressing component being used to apply pressing force to the support mechanism, so that the inner wall of the pipe with the plastic inner lining fits against the cutting component.

[0007] Furthermore, the cutting assembly includes a third screw hole on the side wall of the base, a washer is fitted on one side of the third screw hole, a cutter is fitted on the other side of the washer, the cutter and the washer are penetrated by a third bolt, and the third bolt is threadedly connected to the third screw hole.

[0008] Furthermore, a ring blade tip is fixedly connected to the outer wall of the cutter. The ring blade tip has a conical cross-section and is distributed in a ring on the outer wall of the cutter.

[0009] Furthermore, the support mechanism includes a fourth screw hole that passes through both sides of the fixed block. A first groove is opened on one side of the fourth screw hole, which is adapted to be installed with the bearing. A second bolt is provided on one side of the bearing, and the second bolt passes through the center of the bearing and is threadedly connected to the fourth screw hole.

[0010] Furthermore, the base has scale lines on its side.

[0011] Furthermore, a second groove is provided on the side wall of the fixing block, and the second groove is adapted to the gasket.

[0012] Furthermore, the fixing block has symmetrical waist-shaped grooves on both sides, and two first bolts are movably connected in the waist-shaped grooves. The base sidewall has four second screw holes that are threadedly connected to the corresponding first bolts to adjust the height of the fixing block.

[0013] Furthermore, the extrusion assembly includes a push rod disposed within the first screw hole, the push rod having a third thread on its outer side, the third thread on the push rod being adapted to the internal thread of the first screw hole, and the other end of the push rod abutting against the side wall of the fixing block.

[0014] Furthermore, the inner wall of the pipe with plastic lining is the pipe lining, the pipe lining abuts against the tip of the ring cutter, and the outer wall of the pipe with plastic lining is the pipe outer wall.

[0015] Furthermore, the inner ring of the bearing is movably connected to the second bolt, and the outer wall of the outer ring of the bearing abuts against the outer wall of the pipeline.

[0016] The beneficial effects of this utility model are:

[0017] The cutting assembly mounted on the base not only enables circumferential cutting of pipes with plastic liners, meeting the core requirement of cutting small-diameter pipe liners, but also facilitates easy replacement, maintenance, or cleaning of the cutting components due to their detachability, extending the overall service life of the tool. The support mechanism mounted on the side wall of the base stably supports the pipes with plastic liners while allowing the pipes to rotate relative to the support mechanism, providing stable and adjustable operating conditions for circumferential cutting and ensuring a uniform cutting trajectory. The extrusion assembly at the bottom of the base applies extrusion force to the support mechanism, precisely controlling the position of the pipes with plastic liners, ensuring a tight fit between the inner wall of the pipe and the cutting assembly, effectively avoiding cutting deviations caused by loose fit, and improving cutting accuracy and effect. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the overall structure of a tool for cutting the inner lining of small-diameter pipes proposed in this utility model;

[0019] Figure 2 This is a schematic diagram of the base structure of a tool for cutting the inner lining of small-diameter pipes proposed in this utility model;

[0020] Figure 3 This is a schematic diagram of the fixing block structure of a tool for cutting the inner lining of small-diameter pipes proposed in this utility model;

[0021] Figure 4 This is a schematic diagram of the second groove structure on the fixing block of a tool for cutting the inner lining of small-diameter pipes proposed in this utility model;

[0022] Figure 5 This is a schematic diagram of the bearing and cutter mounting structure of a tool for cutting the inner lining of small-diameter pipes proposed in this utility model;

[0023] Figure 6 This is a schematic diagram of the support mechanism structure of a tool for cutting the inner lining of small-diameter pipes proposed in this utility model;

[0024] Figure 7 This is a schematic diagram of the extrusion assembly structure of a tool for cutting the inner lining of small-diameter pipes proposed in this utility model;

[0025] The markings in the diagram are as follows:

[0026] 1. Base; 2. Fixing block; 3. First bolt; 4. Push rod; 5. Bearing; 6. Second bolt; 7. Washer; 8. Cutter; 9. Third bolt; 10. Pipe with plastic liner; 11. Scale line; 12. First screw hole; 13. Second screw hole; 14. Third screw hole; 21. Waist-shaped groove; 22. First groove; 23. Fourth screw hole; 24. Second groove; 41. Third thread; 51. Inner ring; 52. Outer ring; 61. First thread; 81. Ring cutter tip; 91. Second thread; 101. Pipe liner; 102. Pipe outer wall. Detailed Implementation

[0027] The technical solutions of the embodiments of this application will be clearly described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this application. All other embodiments obtained by those skilled in the art based on the embodiments of this application are within the scope of protection of this application.

[0028] In the description of this application, it should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to this application. For ease of description, the dimensions of the various parts shown in the drawings are not drawn to actual scale. Techniques, methods, and devices known to those skilled in the art may not be discussed in detail, but where appropriate, such techniques, methods, and devices should be considered part of the specification. In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not as limitations. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters in the following drawings denote similar items; therefore, once an item is defined in one drawing, it need not be further discussed in subsequent drawings.

[0029] It should be noted that the terms "first," "second," etc., used in the specification and claims of this application are used to distinguish similar objects and not to describe a specific order or sequence. It should be understood that such use of data can be interchanged where appropriate so that embodiments of this application can be implemented in orders other than those illustrated or described herein, and the objects distinguished by "first," "second," etc., are generally of the same class and are not limited in number; for example, a first object can be one or more. Furthermore, in the specification and claims, "and / or" indicates at least one of the connected objects, and the character " / " generally indicates that the preceding and following objects are in an "or" relationship.

[0030] It should be noted that in the description of this application, the directional terms such as "front, back, up, down, left, right", "horizontal, vertical, horizontal" and "top, bottom" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description. Unless otherwise stated, these directional terms do not indicate or imply that the device or element referred to must have a specific orientation or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on the scope of protection of this application. The directional terms "inner" and "outer" refer to the inner and outer contours relative to the outline of each component itself.

[0031] It should be noted that, in this application, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes that element. Furthermore, it should be noted that the scope of the methods and apparatuses in the embodiments of this application is not limited to performing functions in the order shown or discussed, but may also include performing functions substantially simultaneously or in the reverse order, depending on the functions involved. For example, the described methods may be performed in a different order than described, and various steps may be added, omitted, or combined. Additionally, features described with reference to certain examples may be combined in other examples.

[0032] Reference Figures 1 to 5 A tool for cutting the lining of small-diameter pipes, comprising:

[0033] Base 1, on which a cutting component is detachably installed, the cutting component being used to circumferentially cut the pipe 10 with a plastic liner;

[0034] A support mechanism is mounted on the side wall of the base 1, the pipe with plastic lining is supported on the support mechanism, and the pipe with plastic lining can rotate relative to the support mechanism.

[0035] The bottom of the base 1 has a through-hole 12, and a pressing component is installed in the first screw hole 12. The pressing component is used to apply pressing force to the support mechanism so that the inner wall of the plastic-lined pipe 10 fits against the cutting component.

[0036] This application detachably installs the appropriate cutting component onto the base 1, aligning the cutting component with the cutting position of the plastic-lined pipe 10, thus preparing for the circumferential cutting operation. Next, the plastic-lined pipe is placed on the support mechanism on the side wall of the base 1, providing stable support for the pipe. At this point, the operator can push the pipe, causing it to rotate relative to the support mechanism around its own axis. Finally, by adjusting the extrusion component inside the first screw hole 12 at the bottom of the base 1, the extrusion component applies extrusion force to the support mechanism. Under this force, the support mechanism moves the pipe towards the cutting component until the inner wall of the pipe is completely in contact with the cutting component. Then, the operator rotates the pipe, and the cutting component performs a circumferential cutting operation on the pipe liner 101, achieving precise cutting of the small-diameter pipe liner 101.

[0037] In the example of this application, the cutting assembly includes a third screw hole 14 opened on the side wall of the base 1. A washer 7 is fitted on one side of the third screw hole 14, and a cutter 8 is fitted on the other side of the washer 7. The cutter 8 and the washer 7 are penetrated by a third bolt 9, and the third bolt 9 is threadedly connected to the third screw hole 14. A second thread 91 is opened on the outer side of the third bolt 9, and the second thread 91 on the third bolt 9 is adapted to the internal thread of the third screw hole 14.

[0038] As a preferred example of this utility model, the gasket 7 is placed on one side of the third screw hole 14 on the side wall of the base 1, and then the cutter 8 is attached to the outside of the gasket 7, so that the axes of the cutter 8, the gasket 7 and the third screw hole 14 are aligned. Then, the third bolt 9 is passed through the cutter 8 and the gasket 7 and screwed into the third screw hole 14. By tightening the third bolt 9, the cutter 8 and the gasket 7 are firmly fixed to the base 1 by the thread locking action of the bolt and the screw hole, preventing the cutter 8 from shifting during cutting. If it is necessary to adapt to linings of different thicknesses or pipes of different diameters, the screwing depth can be adjusted by rotating the third bolt 9, thereby changing the length of the cutter 8 extending out of the base 1, so that the cutter 8 can accurately act on the cutting position of the pipe lining 101. At the same time, the gasket 7 forms a buffer layer between the cutter 8 and the base 1. When the third bolt 9 is tightened, the gasket 7 can disperse the pressure between the cutter 8 and the base 1, avoiding hard contact that could cause deformation or damage to the components, and ensuring the stable operation of the cutting assembly.

[0039] In the example of this application, a ring blade tip 81 is fixedly connected to the outer wall of the cutter 8. The ring blade tip 81 has a conical cross-section and is distributed in a ring on the outer wall of the cutter 8.

[0040] As a preferred example of this utility model, when the cutter 8 is working, the conical ring tip 81 fixed on its outer wall directly contacts the inner wall of the pipe 10 with plastic liner. Since the ring tip 81 is conical, the pressure at the tip is greater. When the extrusion assembly pushes the pipe to fit with the cutter 8, the conical tip can easily penetrate the plastic liner. As the operator rotates the pipe, the ring-shaped ring tips 81 form a continuous cutting trajectory around the inner wall of the pipe. Each ring tip 81 participates in the cutting process and works together on the liner to ensure that the cutting trajectory is complete and uniform, avoiding local incomplete cutting due to uneven distribution of the tips. The conical structure can reduce the contact area with the liner during the cutting process, reduce the cutting resistance, make the pipe rotate more smoothly, and finally form a smooth and flat cutting surface, reducing subsequent trimming processes.

[0041] In the example of this application, the support mechanism includes a fourth screw hole 23 that is provided through both sides of the fixed block 2. A first groove 22 is provided on one side of the fourth screw hole 23. The first groove 22 is adapted to be installed with the bearing 5. A second bolt 6 is provided on one side of the bearing 5. The second bolt 6 passes through the center of the bearing 5 and is threadedly connected to the fourth screw hole 23. A first thread 61 is provided on the outer wall of the second bolt 6. The first thread 61 on the second bolt 6 is adapted to the internal thread of the fourth screw hole 23.

[0042] As a preferred example of this utility model, the bearing 5 is first fitted into the first groove 22 of the fixing block 2, so that the outer ring 52 of the bearing 5 fits tightly against the inner wall of the first groove 22, thus achieving the initial positioning of the bearing 5. Then, the second bolt 6 is inserted through the central shaft of the bearing 5 and screwed into the fourth screw hole 23 of the fixing block 2. By tightening the second bolt 6, the bearing 5 is firmly fixed on the fixing block 2, ensuring that the bearing 5 does not loosen during the support process. When the pipe with plastic liner is placed on the support mechanism, the outer wall 102 of the pipe contacts the outer ring 52 of the bearing 5. At this time, when the operator rotates the pipe, the pipe will drive the outer ring 52 of the bearing 5 to rotate synchronously. The inner ring 51 of the bearing 5 remains stationary because it is fixed with the second bolt 6. The rolling elements between the inner and outer rings 52 of the bearing 5 convert the sliding friction between the pipe and the support mechanism into rolling friction, which greatly reduces the rotation resistance, making the pipe rotation easier. At the same time, it avoids damage caused by direct friction between the outer wall 102 of the pipe and the support mechanism, ensuring the integrity of the pipe body.

[0043] In the example of this application, the base 1 is provided with scale lines 11 on its side.

[0044] As a preferred example of this utility model, the scale line 11 on the side of the base 1 marks precise dimensional values ​​starting from a fixed reference point; during tool assembly and cutting operations, when adjusting the position of the cutting component, the operator can determine the installation dimensions of the cutting component by observing the alignment position of the edge of the cutting component with the scale line 11, ensuring that the cutting component is aligned with the preset cutting point; when adjusting the height of the support mechanism, the height value of the support mechanism can be read according to the scale line 11, so that the support height matches the pipe diameter.

[0045] In the example of this application, the sidewall of the fixing block is provided with a second groove 24, which is adapted to the gasket 7.

[0046] As a preferred example of this utility model, the second groove 24 on the side wall of the fixing seat is perfectly matched with the shape and size of the gasket 7. When installing the cutting assembly, the gasket 7 is first embedded in the second groove 24. The groove wall of the second groove 24 limits the gasket 7, preventing the gasket 7 from shifting in the horizontal or vertical direction, and ensuring that the gasket 7 is always in the preset position between the cutter 8 and the fixing seat. Then, the cutter 8 is installed and the third bolt 9 is tightened. At this time, under the constraint of the second groove 24, the gasket 7 is tightly fitted with the side wall of the fixing seat and will not be displaced due to the bolt tightening force or cutting vibration. The stable positioning of the gasket 7 enables it to continuously play a buffering role, dispersing the pressure transmitted from the cutter 8 to the fixing seat, while ensuring that the distance between the cutter 8 and the fixing seat is stable, avoiding the change in the position of the cutter 8 due to the offset of the gasket 7, thereby ensuring the accuracy of the cutting trajectory.

[0047] In the example of this application, the fixing block 2 has symmetrical waist-shaped grooves 21 on both sides, and two first bolts 3 are movably connected in the waist-shaped grooves 21. The side wall of the base 1 is provided with four second screw holes 13, and the second screw holes 13 are threadedly connected to the corresponding first bolts 3 for adjusting the height of the fixing block 2.

[0048] As a preferred example of this utility model, the waist-shaped grooves 21 on both sides of the fixing block 2 are opened in the vertical direction. The first bolt 3 passes through the waist-shaped groove 21 and is threadedly connected to the second screw hole 13 on the side wall of the base 1. At this time, the head of the first bolt 3 abuts against the outer wall of the fixing block 2, fixing the fixing block 2 to the base 1. When it is necessary to adapt to pipelines of different diameters, the first bolt 3 is loosened first to create a gap between the first bolt 3 and the fixing block 2. At this time, the fixing block 2 can move up and down along the length of the waist-shaped groove 21, thereby driving the support mechanism to rise and fall synchronously. After the operator adjusts the fixing block 2 to a suitable height according to the pipeline diameter requirements, the first bolt 3 is tightened again, and the fixing block 2 is fixed again by using the threaded locking effect of the bolt and the screw hole. Since the waist-shaped groove 21 and the first bolt 3 are symmetrically arranged, the fixing block 2 is subjected to uniform force during the lifting and lowering process, and there will be no unilateral tilting, ensuring that the support mechanism always remains in a horizontal state and provides stable support for the pipeline.

[0049] In the example of this application, the extrusion assembly includes a push rod 4 disposed in the first screw hole 12, the push rod 4 having a third thread 41 on its outer side, the third thread 41 on the push rod 4 being adapted to the internal thread of the first screw hole 12, and the other end of the push rod 4 abutting against the side wall of the fixing block 2.

[0050] In a preferred embodiment of this utility model, the third thread 41 on the outer side of the push rod 4 of the extrusion assembly is fully adapted to the internal thread of the first threaded hole 12 at the bottom of the base 1. In the initial state, the push rod 4 does not apply pressure to the fixing block 2, and the support mechanism is in the initial position. When it is necessary to make the inner wall of the pipeline fit with the cutting assembly, the operator rotates the push rod 4. Using the helical transmission of the thread, the push rod 4 moves towards the side of the fixing block 2 along the axial direction of the first threaded hole 12 until the end of the push rod 4 abuts against the side wall of the fixing block 2. Continuing to rotate the push rod 4, the push rod 4 generates extrusion force on the fixing block 2. Under the action of the extrusion force, the fixing block 2 drives the support mechanism and the pipeline to move towards the cutting assembly until the inner wall of the pipeline fits with the cutting assembly. Since the threaded connection has a self-locking characteristic, after the rotation of the push rod 4 is stopped, the push rod 4 will not retract on its own due to the reaction force of the fixing block 2. The extrusion force remains stable, ensuring that the pipeline always remains in contact with the cutting assembly during the cutting process.

[0051] In the example of this application, the inner wall of the plastic-lined pipe 10 is the pipe liner 101, the pipe liner 101 abuts against the ring cutter tip 81, and the outer side of the plastic-lined pipe 10 is the pipe outer wall 102.

[0052] As a preferred example of this utility model, the pipe 10 with a plastic liner consists of an outer pipe wall 102 and an inner pipe liner 101. The target of the cutting operation is the inner pipe liner 101. When installing the pipe, it is necessary to ensure that the inner pipe liner 101 on the inner wall of the pipe corresponds to the ring tip 81 of the cutter 8, so that the ring tip 81 only contacts the inner pipe liner 101 and does not contact the outer pipe wall 102. When the extrusion assembly pushes the pipe to move, the inner pipe liner 101 directly abuts against the ring tip 81, and the ring tip 81 penetrates the inner pipe liner 101.

[0053] In the example of this application, the inner shaft of the bearing 5 is the inner ring 51, which is movably connected to the second bolt 6, and the outer shaft of the bearing 5 is the outer ring 52, the outer wall of which abuts against the outer wall 102 of the pipeline.

[0054] In a preferred embodiment of this utility model, the bearing 5 consists of an inner ring 51, an outer ring 52, and rolling elements. The inner ring 51 is movably connected to the second bolt 6, meaning that the inner ring 51 can rotate around the axis of the second bolt 6, while the second bolt 6 is fixed to the fixing block 2, keeping the position of the inner ring 51 unchanged. The outer ring 52 contacts the rolling elements of the bearing 5 and can rotate freely around the inner ring 51. When the pipe with the plastic liner is placed on the support mechanism, the outer wall 102 of the pipe abuts against the outer wall of the outer ring 52. At this time, the outer ring 52 remains relatively stationary with the pipe under the pressure of the pipe. When the operator rotates the pipe, the pipe drives the outer ring 52 to rotate synchronously. The outer ring 52 rolls relative to the inner ring 51 through the rolling elements, converting the friction between the pipe and the support mechanism into rolling friction, reducing rotational resistance. At the same time, the contact area between the outer ring 52 and the outer wall 102 of the pipe is large, which can provide stable support for the pipe, preventing the pipe from shaking or shifting during rotation and ensuring a smooth cutting process.

[0055] The embodiments of this application have been described above with reference to the accompanying drawings. Unless otherwise specified, the embodiments and features in the embodiments of this application can be combined with each other. This application is not limited to the specific embodiments described above. The specific embodiments described above are merely illustrative and not restrictive. Those skilled in the art can make many other forms under the guidance of this application without departing from the spirit and scope of the claims, and all of these forms are within the protection scope of this application.

Claims

1. A tool for cutting the lining of small-diameter pipes, characterized in that... ,include: A base (1) is provided with a cutting assembly that is detachably mounted on the base (1) for circumferentially cutting a pipe (10) with a plastic liner. A support mechanism is mounted on the side wall of the base (1), the plastic-lined pipe is supported on the support mechanism, and the plastic-lined pipe can rotate relative to the support mechanism. The bottom of the base (1) is provided with a first screw hole (12), and a pressing component is installed in the first screw hole (12). The pressing component is used to apply a pressing force to the support mechanism so that the inner wall of the plastic-lined pipe (10) fits with the cutting component.

2. The tool for cutting the lining of small-diameter pipes according to claim 1, characterized in that, The cutting assembly includes a third screw hole (14) opened on the side wall of the base (1), a washer (7) is fitted on one side of the third screw hole (14), and a cutter (8) is fitted on the other side of the washer (7). The cutter (8) and the washer (7) are penetrated by a third bolt (9), and the third bolt (9) is threadedly connected to the third screw hole (14).

3. The tool for cutting the lining of small-diameter pipes according to claim 2, characterized in that, The outer wall of the cutter (8) is fixedly connected with a ring blade tip (81), the cross section of the ring blade tip (81) is conical, and the ring blade tip (81) is distributed in a ring on the outer wall of the cutter (8).

4. The tool for cutting the lining of small-diameter pipes according to claim 3, characterized in that, The support mechanism includes a fourth screw hole (23) that is provided through both sides of the fixed block (2). A first groove (22) is provided on one side of the fourth screw hole (23). The first groove (22) is adapted to be installed with the bearing (5). A second bolt (6) is provided on one side of the bearing (5). The second bolt (6) passes through the center of the bearing (5) and is threadedly connected to the fourth screw hole (23).

5. A tool for cutting the lining of small-diameter pipes according to claim 4, characterized in that, The base (1) has scale lines (11) on its side.

6. A tool for cutting the lining of small-diameter pipes according to claim 5, characterized in that, The fixing block (2) has a second groove (24) on its side wall, which is adapted to the gasket (7).

7. A tool for cutting the lining of small-diameter pipes according to claim 6, characterized in that, The fixing block (2) has symmetrical waist-shaped grooves (21) on both sides. Two first bolts (3) are movably connected in the waist-shaped grooves (21). The base (1) has four second screw holes (13) through the side wall. The second screw holes (13) are threadedly connected to the corresponding first bolts (3).

8. A tool for cutting the lining of small-diameter pipes according to claim 7, characterized in that, The extrusion assembly includes a push rod (4) disposed in the first screw hole (12), the push rod (4) having a third thread (41) on its outer side, the third thread (41) on the push rod (4) being adapted to the internal thread of the first screw hole (12), and the other end of the push rod (4) abutting against the side wall of the fixing block (2).

9. A tool for cutting the lining of small-diameter pipes according to claim 8, characterized in that, The inner wall of the plastic-lined pipe (10) is the pipe liner (101), the pipe liner (101) abuts against the ring cutter tip (81), and the outer side of the plastic-lined pipe (10) is the pipe outer wall (102).

10. A tool for cutting the lining of small-diameter pipes according to claim 9, characterized in that, The inner ring (51) of the bearing (5) is movably connected to the second bolt (6), and the outer wall of the outer ring (52) of the bearing (5) abuts against the outer wall (102) of the pipeline.

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