CN218255416U - Plastic pipeline cutting device - Google Patents

Abstract

The utility model relates to a plastic pipeline cutting device, which comprises a cutting box; a group of supporting legs is fixedly connected to the bottom end of the cutting box; a first through hole is formed in the cutting box; an annular groove is formed in the inner wall of the first through hole; an annular groove is formed in the side wall of the annular groove; a first annular rack plate is arranged in the annular groove; a group of connecting columns are fixedly connected to the side wall of the first annular rack plate and are connected in the annular groove in a sliding manner; a cutting piece is arranged on the annular inner wall of the first annular rack plate; in order to solve and pass through draw gear entering cutting box at the plastic conduit, when needs cut off the plastic conduit, cutter extrusion cutting about generally adopting not only extrudees the plastic conduit, appears slightly warping, and the extrusion cutting of cutter about and can cause the cutting plane unsmooth, influences the problem of whole plastic conduit's quality.

Description

Plastic pipeline cutting device

Technical Field

The utility model belongs to the technical field of the pipeline production, specific plastic conduit cutting device that says so.

Background

The plastic pipeline is produced by the processes of mixing, plasticizing extrusion, traction, cooling molding, cutting, rolling and the like of plastic materials, has the characteristics of light self weight, long service life, energy conservation and the like, and is suitable for the fields of municipal administration, engineering and the like.

In the prior art, when a plastic pipeline enters a cutting box through a traction device and needs to be cut off, an upper cutter and a lower cutter are generally adopted for extrusion cutting, so that the plastic pipeline is extruded and slightly deformed, and the extrusion cutting of the upper cutter and the lower cutter can cause the uneven cutting surface and influence the quality of the whole plastic pipeline; therefore, the utility model provides a plastic pipeline cutting device.

SUMMERY OF THE UTILITY MODEL

In order to compensate prior art's not enough, solve and pass through draw gear at plastic conduit and get into the cutting incasement, when needs cut off plastic conduit, cutter extrusion cutting about generally adopting not only extrudees plastic conduit, appears slightly warping, and the extrusion cutting of cutter about and can cause the cutting plane unsmooth, influences the problem of whole plastic conduit's quality, the utility model provides a plastic conduit cutting device.

The utility model provides a technical scheme that its technical problem adopted is: the utility model relates to a plastic pipeline cutting device, which comprises a cutting box; a group of supporting legs is fixedly connected to the bottom end of the cutting box; a first through hole is formed in the cutting box; an annular groove is formed in the inner wall of the first through hole; an annular groove is formed in the side wall of the annular groove; a first annular rack plate is arranged in the annular groove; a group of connecting columns are fixedly connected to the side wall of the first annular rack plate and are connected in the annular groove in a sliding mode; a cutting piece is arranged on the annular inner wall of the first annular rack plate; the inner wall of the annular groove is provided with a power unit, and the power unit drives the first annular rack plate to rotate; drive first ring-shaped rack board through power pack and rotate, first ring-shaped rack board rotates and can drive the cutting piece and rotate to first through-hole direction and remove, and then carries out annular cutting to the plastic conduit who is located in first through-hole and handle, utilizes annular cutting can slowly stretch into the plastic conduit in and cut, and the cutting depth is by shallow to dark, lets the cutting plane more level and smooth, and the annular cutting can guarantee that the condition of wire drawing can not appear in the cutting quality simultaneously.

Preferably, the power unit comprises an electric motor; the motor is fixedly connected to the side wall of the annular groove; the output end of the motor is provided with a first rotating shaft; a first gear is fixedly connected to the first rotating shaft; the first gear and the first ring-shaped rack plate are meshed with each other; drive first ring-shaped rack board through first gear and rotate, and then let the cutting piece carry out the annular and cut the processing to plastic conduit.

Preferably, the cutting element comprises an inverted T-shaped post; the annular inner wall of the first annular rack plate is provided with an annular gear; the top end of the ring gear is provided with a ring T-shaped groove; the annular T-shaped groove is connected with an inverted T-shaped column in a sliding mode, and the top end of the inverted T-shaped column is fixedly connected to the inner wall of the first annular rack plate; the inner wall of the ring gear is in threaded connection with a threaded column, and the bottom end of the threaded column is fixedly connected with a movable plate; the bottom end of the moving plate is fixedly connected with a cutting blade; the threaded post is defined by a guide; the ring gear rotates through the power part; the screw thread post can drive the cutting piece and remove to first through-hole center department, and then cuts the plastic conduit who is located first through-hole and handles.

Preferably, the power member comprises a second annular rack plate; a second annular rack plate is rotatably connected to the side wall of the annular groove far away from the annular groove; a second gear is fixedly connected to the end part of the first rotating shaft; the second gear is meshed with the outer side wall of the second annular rack plate; the side wall of the second annular rack plate is meshed with the annular gear; the second ring-shaped rack plate can drive the ring gear to rotate relatively, so that the threaded column is moved down integrally, the cutting piece is extended into the first through hole, annular cutting processing is carried out on the pipeline from shallow to deep, the threaded column can be far away from the first through hole to move along with the first rotating shaft in the reverse rotation mode, and then the initial position is returned, and cutting of the plastic pipeline is completed.

Preferably, the guide member includes a square groove; the top end of the threaded column is provided with a square groove; a square column is fixedly connected to the inner wall of the first annular rack plate; the square column is connected in the square groove in a sliding manner; the condition of axial rotation is avoided appearing, guarantees the state of screw thread post under ring gear rotates.

Preferably, the second gear inner diameter is larger than the first gear inner diameter; the second ring rack plate inner diameter is greater than the first ring rack plate inner diameter; the rotation rate of the second ring-shaped rack plate can be made higher than that of the first ring-shaped rack plate, and the rotation of the ring gear is ensured.

Preferably, the bottom end of the moving plate is hinged with a pair of hinged plates which are symmetrically distributed relative to the cutting blade, and a torsional spring is arranged at the hinged position; a first groove is formed in the end part of the hinged plate; a second rotating shaft is rotatably connected in the first groove; the outer side wall of the second rotating shaft is fixedly connected with a roller; the worker running roller can contact with the pipeline lateral wall each other earlier, and then carries out whole extrusion to it and smooths the processing, avoids the appearance of the burr of initial annular cutting.

Preferably, a first through groove is formed at the bottom end of the annular groove; the cutting piece is an arc piece; utilize the first open mode who leads to the groove bottom can conveniently clear up cutting impurity, avoid impurity to pile up, and the cutting piece is the arc piece, makes things convenient for the rotatory cutting of annular.

The utility model has the advantages as follows:

1. a plastic conduit cutting device, drive first ring rack board through power pack and rotate, first ring rack board rotates and can drive the cutting piece and rotate the removal to first through-hole direction, and then carry out the annular cutting to the plastic conduit who is located in first through-hole and handle, utilize the annular cutting can slowly stretch into the plastic conduit and cut, the depth of cut is by shallow to dark, let the cutting plane more level and smooth, the condition of wire drawing can not appear in the quality of guaranteeing to cut of annular cutting simultaneously.

2. A plastic conduit cutting device, drive first axis of rotation through the motor, can drive first gear and second gear rotation simultaneously, and then drive first ring rack board and second ring rack board simultaneously and rotate, because of first gear and second gear internal diameter are different, can drive second ring rack board and be higher than first ring rack board, and both are relative speed unchangeable, consequently when first ring rack board rotates, second ring rack board can drive ring gear relative rotation this moment, and then let the screw post wholly move down, and then let the cutting piece stretch into in the first through-hole, carry out annular cutting to the pipeline by shallow to dark and handle.

The above description of the present invention is only an overview of the technical solutions of the present application, and in order to make the technical solutions of the present application more clearly understood by those skilled in the art, further, the present invention can be implemented according to the contents described in the text and the drawings of the present application, and in order to make the above objects, other objects, features, and advantages of the present application more easily understood, the following description will be made in conjunction with the detailed description of the present application and the drawings.

Drawings

The drawings are only for purposes of illustrating the principles, implementations, applications, features, and effects of particular embodiments of the application, as well as others related thereto, and are not to be construed as limiting the application.

In the drawings of the specification:

fig. 1 is a perspective view of the present invention;

fig. 2 is a cross-sectional view of the present invention;

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

FIG. 4 is a side cross-sectional view of the present invention;

fig. 5 is a partially enlarged view of fig. 4 at B.

The reference numerals referred to in the above figures are explained below:

1. cutting the box; 11. a first through hole; 12. supporting legs; 13. an annular groove; 14. a first ring-shaped rack plate; 15. an annular groove; 16. connecting columns; 2. an electric motor; 21. a first rotating shaft; 22. a first gear; 3. an inverted T-shaped post; 31. an annular T-shaped slot; 32. a ring gear; 33. a threaded post; 34. moving the plate; 35. cutting the slices; 4. a second annular rack plate; 41. a second gear; 42. a square groove; 43. a square column; 44. a first through groove; 45. a hinge plate; 46. a first groove; 47. a second rotating shaft; 48. and (4) rolling.

Detailed Description

In order to explain in detail possible application scenarios, technical principles, practical embodiments, and the like of the present application, the following detailed description is given with reference to the accompanying drawings in conjunction with the listed embodiments. The embodiments described herein are merely for more clearly illustrating the technical solutions of the present application, and therefore, the embodiments are only used as examples, and the scope of the present application is not limited thereby.

Reference herein to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of the application. The appearances of the phrase "an embodiment" in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or related to other embodiments specifically defined. In principle, in the present application, the technical features mentioned in the embodiments can be combined in any manner to form a corresponding implementable solution as long as there is no technical contradiction or conflict.

Unless defined otherwise, technical terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs; the use of relational terms herein is intended to describe specific embodiments only and is not intended to limit the present application.

In the description of the present application, the term "and/or" is a expression for describing a logical relationship between objects, meaning that three relationships may exist, for example a and/or B, meaning: there are three cases of A, B, and both A and B. In addition, the character "/" herein generally indicates that the former and latter associated objects are in a logical relationship of "or".

In this application, terms such as "first" and "second" are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions.

Without further limitation, in this application, the use of "including," "comprising," "having," or other similar expressions in phrases and expressions of "including," "comprising," or "having," is intended to cover a non-exclusive inclusion, and such expressions do not exclude the presence of additional elements in a process, method, or article that includes the recited elements, such that a process, method, or article that includes a list of elements may include not only those elements but also other elements not expressly listed or inherent to such process, method, or article.

As is understood in the examination of the guidelines, the terms "greater than", "less than", "more than" and the like in this application are to be understood as excluding the number; the expressions "above", "below", "within" and the like are understood to include the present numbers. In addition, in the description of the embodiments of the present application, "a plurality" means two or more (including two), and expressions related to "a plurality" similar thereto are also understood, for example, "a plurality of groups", "a plurality of times", and the like, unless specifically defined otherwise.

In the description of the embodiments of the present application, spatially relative expressions such as "central," "longitudinal," "lateral," "length," "width," "thickness," "up," "down," "front," "back," "left," "right," "vertical," "horizontal," "vertical," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," "circumferential," and the like are used, and the indicated orientations or positional relationships are based on the orientations or positional relationships shown in the specific embodiments or drawings and are only for convenience of describing the specific embodiments of the present application or for the convenience of the reader, and do not indicate or imply that the device or component in question must have a specific position, a specific orientation, or be constructed or operated in a specific orientation and therefore should not be construed as limiting the embodiments of the present application.

Unless specifically stated or limited otherwise, the terms "mounted," "connected," "secured," and "disposed" used in the description of the embodiments of the present application should be construed broadly. For example, the connection can be a fixed connection, a detachable connection, or an integrated arrangement; it can be a mechanical connection, an electrical connection, or a communication connection; they may be directly connected or indirectly connected through an intermediate; which may be communication within two elements or an interaction of two elements. Specific meanings of the above terms in the embodiments of the present application can be understood by those skilled in the art to which the present application pertains in accordance with specific situations.

As shown in fig. 1 to 5, the plastic pipeline cutting device of the present invention comprises a cutting box 1; a group of supporting legs 12 are fixedly connected to the bottom end of the cutting box 1; a first through hole 11 is formed in the cutting box 1; an annular groove 13 is formed in the inner wall of the first through hole 11; an annular groove 15 is formed in the side wall of the annular groove 13; a first annular rack plate 14 is arranged in the annular groove 13; a group of connecting columns 16 are fixedly connected to the side wall of the first annular rack plate 14, and the connecting columns 16 are connected in the annular groove 15 in a sliding manner; a cutting piece is arranged on the annular inner wall of the first annular rack plate 14; a power unit is arranged on the inner wall of the annular groove 13 and drives the first annular rack plate 14 to rotate; among the prior art, in plastic conduit passed through draw gear entering cutting box 1, when needs cut off plastic conduit, cutter extrusion cutting about generally adopting, not only extrude plastic conduit, appear slightly warping, and the extrusion cutting of cutter from top to bottom can cause the cutting plane unsmooth, influences the quality of whole plastic conduit, for this reason the utility model discloses at the during operation, after in getting into cutting box 1 with plastic conduit through draw gear, when needs cut plastic conduit, drive first annular rack plate 14 through power pack and rotate this moment, first annular rack plate 14 rotates and can drive the cutting piece and move to 11 direction rotations of first through-hole, and then carry out annular cutting to the plastic conduit who is located first through-hole 11 and handle, utilize annular cutting can slowly stretch into the plastic conduit and cut, the cutting depth is by shallow to dark, lets the cutting plane more level and smooth, and the circumstances of wire drawing can not appear in the cutting quality can be guaranteed in annular cutting simultaneously.

The power unit comprises an electric motor 2; the motor 2 is fixedly connected to the side wall of the annular groove 13; the output end of the motor 2 is provided with a first rotating shaft 21; a first gear 22 is fixedly connected to the first rotating shaft 21; the first gear 22 and the first ring rack plate 14 are engaged with each other; during operation, start motor 2, motor 2 can drive first gear 22 through first axis of rotation 21 and rotate, then drives first annular rack plate 14 through first gear 22 and rotates, and then lets the cutting piece carry out the annular and carry out cutting treatment to plastic conduit.

The cutting element comprises an inverted T-shaped post 3; a ring gear 32 is arranged on the ring-shaped inner wall of the first ring-shaped rack plate 14; the top end of the ring gear 32 is provided with a ring T-shaped groove 31; the annular T-shaped groove 31 is connected with an inverted T-shaped column 3 in a sliding mode, and the top end of the inverted T-shaped column 3 is fixedly connected to the inner wall of the first annular rack plate 14; the inner wall of the ring gear 32 is in threaded connection with a threaded column 33, and the bottom end of the threaded column 33 is fixedly connected with a moving plate 34; the bottom end of the moving plate 34 is fixedly connected with a cutting blade 35; the threaded post 33 is defined by a guide; the ring gear 32 is rotated by a power member; during operation, at first ring rack plate 14 ring rack, the power part can drive ring gear 32 and rotate this moment, because of threaded connection between ring gear 32 and the screw thread post 33, and screw thread post 33 passes through the guide and rotates, consequently drives ring gear 32 and rotates at the power part, and screw thread post 33 can drive cutting piece 35 and remove to first through-hole 11 center department, and then cuts the processing to the plastic conduit who is located first through-hole 11.

The power member comprises a second ring-shaped rack plate 4; the side wall of the annular groove 13 far away from the annular groove 15 is rotatably connected with a second annular rack plate 4; a second gear 41 is fixedly connected to the end part of the first rotating shaft 21; the second gear 41 and the outer side wall of the second ring-shaped rack plate 4 are engaged with each other; the side wall of the second ring-shaped rack plate 4 is meshed with the ring gear 32; during operation, the motor 2 drives the first rotating shaft 21, and simultaneously drives the first gear 22 and the second gear 41 to rotate, and further simultaneously drives the first annular rack plate 14 and the second annular rack plate 4 to rotate, and due to the different inner diameters of the first gear 22 and the second gear 41, the second annular rack plate 4 is driven to be higher than the first annular rack plate 14, and the relative rates of the first annular rack plate and the second annular rack plate are unchanged, so when the first annular rack plate 14 rotates, the second annular rack plate 4 can drive the annular gear 32 to relatively rotate, and further the threaded column 33 moves down integrally, and further the cutting blade 35 extends into the first through hole 11, and annular cutting processing is performed on the pipeline from shallow depth to deep depth, and similarly and reversely rotates the first rotating shaft 21, and the threaded column 33 can move away from the first through hole 11, and further returns to the initial position, and cutting of the plastic pipeline is completed.

The guide includes a square slot 42; the top end of the threaded column 33 is provided with a square groove 42; a square column 43 is fixedly connected to the inner wall of the first annular rack plate 14; the square column 43 is connected in the square groove 42 in a sliding manner; during operation, because of the setting of square post 43 and square groove 42, can guarantee that screw thread post 33 is linear motion, avoid appearing the axial pivoted condition, guarantee screw thread post 33 and rotate the state under ring gear 32.

The inner diameter of the second gear 41 is larger than that of the first gear 22; the second ring rack plate 4 has an inner diameter larger than that of the first ring rack plate 14; during operation, the inner diameter of the second gear 41 is larger than that of the first gear 22, the inner diameter of the second annular rack plate 4 is larger than that of the first annular rack plate 14, the rotation speed of the second annular rack plate 4 can be higher than that of the first annular rack plate 14, and the rotation of the ring gear 32 is guaranteed.

The bottom end of the moving plate 34 is hinged with a pair of hinged plates 45 which are symmetrically distributed relative to the cutting blade 35, and the hinged position is provided with a torsion spring; a first groove 46 is formed in the end part of the hinge plate 45; a second rotating shaft 47 is rotatably connected in the first groove 46; a roller 48 is fixedly connected to the outer side wall of the second rotating shaft 47; during operation, when the whole 11 directions of first through-hole that move to screw thread post 33, running roller 48 can earlier contact each other with the pipeline lateral wall this moment, and then carries out whole extrusion to it and smooths the processing, avoids the appearance of the burr of initial annular cutting.

The bottom end of the annular groove 13 is provided with a first through groove 44; the cutting piece 35 is an arc-shaped piece; during operation has seted up first logical groove 44 in annular groove 13 bottom, then utilizes the open mode of first logical groove 44 bottom to conveniently clear up cutting impurity, avoids impurity to pile up, and cuts piece 35 and make things convenient for the rotatory cutting of annular.

The working principle is as follows: when the plastic pipeline is required to be cut off, the plastic pipeline is generally extruded and cut by the upper and lower cutters, the plastic pipeline is extruded and slightly deformed, and the extrusion and cutting of the upper and lower cutters can cause the uneven cutting surface, so that the quality of the whole plastic pipeline is influenced, therefore, when the utility model is in operation, after the plastic pipeline is introduced into the cutting box 1 by the traction device, when the plastic pipeline is required to be cut, the motor 2 drives the first rotating shaft 21, and simultaneously drives the first gear 22 and the second gear 41 to rotate, and further simultaneously drives the first annular rack plate 14 and the second annular rack plate 4 to rotate, because the inner diameters of the first gear 22 and the second gear 41 are different, the second annular rack plate 4 is driven to be higher than the first annular rack plate 14, and the relative speeds of the first gear 22 and the second gear 41 are unchanged, when the first annular rack plate 14 rotates, the second annular rack plate 4 can drive the annular gear 32 to rotate relatively, and further enable the threaded column 33 to move down integrally, and further enable the cutting piece 35 to extend into the first through hole 11, so that the annular cutting surface can be cut smoothly and the annular cutting surface can not be cut, and the wire drawing quality of the plastic pipeline can be ensured; due to the arrangement of the square column 43 and the square groove 42, the threaded column 33 can be ensured to move linearly, the axial rotation is avoided, and the state of the threaded column 33 under the rotation of the ring gear 32 is ensured; when the whole screw thread post 33 removed to 11 directions of first through-holes, this moment running roller 48 can earlier with pipeline lateral wall contact each other, and then carry out whole extrusion to it and smooth the processing, avoid the appearance of the burr of initial annular cutting.

In this embodiment, a power mechanism or power unit, including but not limited to an engine, an electric motor, a pneumatic tool, a hydraulic pump, etc. The power unit also comprises a direct power source and an indirect power source, wherein the direct power source can provide power for the power unit, such as an engine, a motor and the like, and the indirect power source comprises a cylinder, a hydraulic cylinder and the like. The power mechanism or the power unit can be matched through a gear and a rack, a sliding block is matched with a sliding groove, a lead screw is matched with a nut to drive the linear reciprocating motion of the execution unit, and the like.

In the present embodiment, the transmission mechanism or transmission unit includes a speed reducer, a gearbox, a worm gear mechanism, a link mechanism, a compound mechanism, and the like. The transmission mechanism or the transmission unit is used for transmitting power from the power mechanism or the power unit to the execution mechanism or the execution unit.

In this embodiment, the actuator or actuator unit includes, but is not limited to, a compression mechanism, a rotation mechanism, a swing mechanism, a vibration mechanism, a lift mechanism, a cutting mechanism, and the like.

Those skilled in the art will appreciate that while some embodiments herein include some features included in other embodiments, rather than others, combinations of features of different embodiments are meant to be within the scope of the application and form different embodiments. For example, in the claims, any of the claimed embodiments may be used in any combination.

Finally, it should be noted that: the above embodiments are only used for illustrating the technical solutions of the present application, and not for limiting the same; although the present application has been described in detail with reference to the foregoing embodiments, it should be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; such modifications and substitutions do not depart from the spirit and scope of the present disclosure, and the present disclosure should be construed as being covered by the claims and the specification. In particular, the technical features mentioned in the embodiments can be combined in any way as long as there is no structural conflict. The present application is not intended to be limited to the particular embodiments disclosed herein but is to cover all embodiments that may fall within the scope of the appended claims.

Claims (8)

1. A plastic pipe cutting device, characterized by comprising a cutting box (1); a group of supporting legs (12) are fixedly connected to the bottom end of the cutting box (1); a first through hole (11) is formed in the cutting box (1); an annular groove (13) is formed in the inner wall of the first through hole (11); an annular groove (15) is formed in the side wall of the annular groove (13); a first annular rack plate (14) is arranged in the annular groove (13); a group of connecting columns (16) are fixedly connected to the side wall of the first annular rack plate (14), and the connecting columns (16) are connected in the annular groove (15) in a sliding manner; a cutting piece is arranged on the annular inner wall of the first annular rack plate (14); and a power unit is arranged on the inner wall of the annular groove (13), and the power unit drives the first annular rack plate (14) to rotate.

2. A plastic pipe cutting apparatus as claimed in claim 1, wherein said power unit comprises an electric motor (2); the motor (2) is fixedly connected to the side wall of the annular groove (13); the output end of the motor (2) is provided with a first rotating shaft (21); a first gear (22) is fixedly connected to the first rotating shaft (21); the first gear (22) and the first ring-shaped rack plate (14) are engaged with each other.

3. A plastic pipe cutting apparatus as claimed in claim 2, wherein said cutting member comprises an inverted T-shaped post (3); a ring gear (32) is arranged on the ring-shaped inner wall of the first ring-shaped rack plate (14); the top end of the ring gear (32) is provided with a ring T-shaped groove (31); the annular T-shaped groove (31) is connected with an inverted T-shaped column (3) in a sliding mode, and the top end of the inverted T-shaped column (3) is fixedly connected to the inner wall of the first annular rack plate (14); the inner wall of the ring gear (32) is in threaded connection with a threaded column (33), and the bottom end of the threaded column (33) is fixedly connected with a moving plate (34); the bottom end of the moving plate (34) is fixedly connected with a cutting blade (35); the threaded post (33) is defined by a guide; the ring gear (32) is rotated by a power member.

4. A plastic pipe cutting apparatus as claimed in claim 3, wherein said power member comprises a second ring-shaped rack plate (4); the side wall of the annular groove (13) far away from the annular groove (15) is rotatably connected with a second annular rack plate (4); a second gear (41) is fixedly connected to the end part of the first rotating shaft (21); the second gear (41) and the outer side wall of the second annular rack plate (4) are meshed with each other; the side wall of the second annular rack plate (4) is meshed with the annular gear (32).

5. A plastic pipe cutting apparatus as claimed in claim 4, wherein said guide comprises a square slot (42); a square groove (42) is formed at the top end of the threaded column (33); a square column (43) is fixedly connected to the inner wall of the first annular rack plate (14); the square column (43) is connected in the square groove (42) in a sliding mode.

6. A plastic pipe cutting apparatus as claimed in claim 5, wherein said second gear (41) has an inner diameter greater than the inner diameter of the first gear (22); the inner diameter of the second ring-shaped rack plate (4) is larger than the inner diameter of the first ring-shaped rack plate (14).

7. A plastic pipe cutting device according to claim 6, wherein the bottom end of the moving plate (34) is hinged with a pair of hinged plates (45) symmetrically distributed about the cutting blade (35), and the hinged position is provided with a torsion spring; a first groove (46) is formed in the end part of the hinge plate (45); a second rotating shaft (47) is connected in the first groove (46) in a rotating mode; and a roller (48) is fixedly connected to the outer side wall of the second rotating shaft (47).

8. A plastic pipeline cutting device as claimed in claim 7, wherein the bottom end of the annular groove (13) is provided with a first through groove (44); the cutting blade (35) is an arc-shaped blade.

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