CN114147990B

CN114147990B - Ultrahigh molecular weight polyethylene pipe production equipment

Info

Publication number: CN114147990B
Application number: CN202111387403.2A
Authority: CN
Inventors: 朱颖慧; 金雪龙
Original assignee: Dalian Tianwei Pipe Industry Co ltd
Current assignee: Dalian Tianwei Pipe Industry Co ltd
Priority date: 2021-11-22
Filing date: 2021-11-22
Publication date: 2024-05-28
Anticipated expiration: 2041-11-22
Also published as: CN114147990A

Abstract

The invention relates to the field of pipe production equipment, in particular to ultra-high molecular weight polyethylene pipe production equipment, which comprises a fixed shell, a polyethylene material extrusion structure and an extrusion molding structure, and is characterized in that: the polyethylene material extrusion structure and the extrusion forming structure are both in sliding connection with the fixed shell, a first movable groove is formed in the top of the fixed shell, a first graduated scale and a second graduated scale are arranged on the top of the fixed shell, one end of the second graduated scale is welded with the top of the fixed shell, and the first graduated scale is in sliding connection with the second graduated scale; the polyethylene material extrusion structure comprises an extrusion shell, an extrusion cavity, a first extrusion screw, a second extrusion screw, a transmission rod, a first worm wheel, a second worm wheel and a material bin, wherein the extrusion shell is in sliding connection with the inner wall of the fixed shell, and the pipe can be cut along with the synchronous cutting structure of the external extrusion speed of the pipe, so that the pipe cannot be broken in the cutting process, and the product quality is improved.

Description

Ultrahigh molecular weight polyethylene pipe production equipment

Technical Field

The invention relates to the field of pipe production equipment, in particular to ultra-high molecular weight polyethylene pipe production equipment.

Background

The ultra-high molecular weight polyethylene refers to polyethylene with a linear structure and a viscosity average molecular weight of more than 150 ten thousand (the molecular weight of common polyethylene is only 2 ten thousand-30 ten thousand), and the polyethylene has excellent comprehensive properties of wear resistance, impact resistance, corrosion resistance, self-lubrication, non-adhesion and the like. The plastic pipe manufactured by taking ultra-high molecular weight polyethylene as the basic raw material has the characteristics of wear resistance, impact resistance, corrosion resistance, self-lubrication, no scaling and the like, and becomes an ideal pipe suitable for conveying solid-liquid mixture, solid powder, liquid, gas and other mediums. And the ultra-high molecular weight polyethylene pipe is popularized and developed for more than ten years, and the ultra-high molecular weight polyethylene pipe has been widely applied to a plurality of fields expected at the beginning to play a unique and important role.

In recent years, due to the breakthrough of plunger pushing, single screw extrusion and other technologies, the ultra-high molecular weight polyethylene pipe also realizes industrialized continuous production in China. In the traditional extrusion type pipe manufacturing method, a knife switch is generally used for cutting the pipe, and the cutting fracture is damaged by the knife switch, so that a large amount of waste of raw materials is caused; the pipe production device can only produce pipes with one length generally, cannot produce pipe products with other specifications, and has low adaptation rate.

Therefore, it is necessary to invent an ultra-high molecular weight polyethylene pipe production apparatus to solve the above problems.

Disclosure of Invention

Aiming at the problems in the prior art, the invention provides ultra-high molecular weight polyethylene pipe production equipment. The problem of tubular product can lead to the fact the fracture damage because the cutting mode is behind in the cutting process after the ejection of compact is solved.

The technical scheme adopted for solving the technical problems is as follows: the ultra-high molecular weight polyethylene pipe production equipment comprises a fixed shell, a polyethylene material extrusion structure and an extrusion forming structure, wherein the polyethylene material extrusion structure and the extrusion forming structure are in sliding connection with the fixed shell, a first movable groove is formed in the top of the fixed shell, a first scale and a second scale are arranged on the top of the fixed shell, one end of the second scale is welded with the top of the fixed shell, and the first scale is in sliding connection with the second scale;

The polyethylene material extrusion structure comprises an extrusion shell, an extrusion cavity, a first extrusion screw, a second extrusion screw, a transmission rod, a first worm wheel, a second worm wheel and a material bin, wherein the extrusion shell is in sliding connection with the inner wall of a fixed shell, the first extrusion screw and the second extrusion screw are meshed, the first extrusion screw and the second extrusion screw are both in rotary connection with the extrusion shell, a first motor is arranged in the fixed shell, a transmission shaft of the first motor is fixedly connected with the second extrusion screw, the transmission rod is fixedly connected with the first extrusion screw, and the first worm wheel and the second worm wheel are respectively fixedly sleeved with the transmission rod and the transmission shaft;

The extrusion molding structure comprises an extrusion rod, an extrusion barrel, a sliding chute, a sliding barrel and a sliding sleeve, wherein the sliding barrel is fixedly connected with the extrusion shell in an inserting mode, the extrusion barrel is connected with the sliding barrel in a sliding mode, the extrusion rod is connected with the extrusion barrel in a sliding mode, the outer wall of the extrusion rod is provided with an annular cutting groove, and the sliding sleeve is fixedly connected with the extrusion barrel in a sleeving mode;

the pipe cutting structure is arranged at the top of the extrusion molding structure, and one end of the pipe cutting structure is hinged with the top of the extrusion barrel.

Specifically, a first sliding block is arranged at the top of the fixed shell, the first sliding block is in sliding sleeve joint with a second graduated scale, the bottom of the first sliding block is fixedly connected with the top of the extrusion shell, a first scale indicator is arranged at the top of the extrusion shell, the bottom of the first scale indicator is fixedly connected with the top of the extrusion shell, and the first scale indicator points to scales;

The top of the sliding sleeve is provided with a second sliding block, the bottom of the second sliding block is fixedly connected with the top of the sliding sleeve, the second sliding block is in sliding connection with the first scale, the top of the sliding sleeve is provided with a second scale indicating needle, the bottom of the second scale indicating needle is fixedly connected with the top of the extrusion shell, and the second scale indicating needle points to scales;

Specifically, tubular product cutting structure includes first cutting structure, cuts structure and position control structure cut off, first cutting structure is articulated with the extrusion bucket, position control structure and first cutting structure top fixed connection cut off, cut structure and fixed shell inner wall rotation connection cut off.

Specifically, first cutting structure includes rotatory sleeve, second movable groove, second motor, motor drive shaft, extrusion piece, T shape rotor plate, telescopic link and cutting knife, rotatory sleeve is articulated with extrusion barrel top, T shape rotor plate rotates with rotatory sleeve and pegs graft, just T shape rotor plate one end and motor drive shaft fixed connection, extrusion piece and T shape rotor plate slip joint, telescopic link both ends respectively with motor drive shaft and T shape rotor plate fixed connection, cutting knife one end and T shape rotor plate fixed grafting.

Specifically, cut-off structure includes first cutting rod, first arc cutting knife, second cutting rod and second arc cutting knife, first cutting rod and second cutting rod all rotate with fixed shell inner wall and are connected, just first cutting rod and second cutting rod mutual swivelling joint, first arc cutting knife and first cutting rod fixed connection, second arc cutting knife and second cutting rod fixed connection.

Specifically, the position control structure includes first rotary rod, second rotary rod, stripper plate, third rotary rod, fourth rotary rod, fifth rotary rod and sixth rotary rod, first rotary rod one end and T shape rotary plate top fixed connection, the other end passes through torsion spring with the second rotary rod and is connected, stripper plate bottom and second rotary rod are articulated, just stripper plate both sides and first movable groove slip grafting, pass through torsion spring swivelling joint between third rotary rod and the fourth rotary rod, just third rotary rod and the fourth rotary rod other end respectively with first cutting rod and second cutting rod swivelling joint, pass through torsion spring swivelling joint between fifth rotary rod and the sixth rotary rod, just the fifth rotary rod and the sixth rotary rod other end respectively with first cutting rod and second cutting rod swivelling joint.

The invention has the beneficial effects that:

(1) According to the stainless steel bar heat treatment equipment, the first sliding block 15 and the second sliding block 17 are shifted, the scale values pointed by the first scale pointer 16 and the second scale pointer 18 are observed while shifting, the numerical values of the two scales are added, and the default pipe length is the length of the pipe currently produced, so that the length of the pipe produced can be freely controlled, and the plasticity is high.

(2) According to the stainless steel bar heat treatment equipment, the second motor 53 is started to drive the motor transmission shaft 54 to rotate, so that the T-shaped rotating plate 56 and the cutting knife 58 are driven to rotate, and the upper part of a pipe at the outlet of a finished pipe product is cut off; because the finished pipe is extruded outwards all the time, the expansion rod 57 is controlled to extend through the hydraulic pressure, so that the cutting position can move along with the extrusion of the pipe, and damage to the intact pipe caused by the cutting knife 58 when the cutting knife rotates is avoided.

(3) According to the stainless steel bar heat treatment equipment disclosed by the invention, the first cutting structure 5 is driven to rotate by the automatic control hydraulic mechanism, so that the first rotary rod 711 and the second rotary rod 712 are driven to rotate, the extrusion plate 713 is pushed forward, the third rotary rod 714 and the fourth rotary rod 715 are pushed outwards, the first cutting rod 61 and the second cutting rod 63 are driven to rotate around the central connection part, the first arc cutting knife 62 and the second arc cutting knife 64 are contacted with a pipe and cut, the sizes of the two arc cutting knives are completely matched with the pipe, and the cut finished product has no quality defects such as burrs.

Drawings

The invention will be further described with reference to the drawings and examples.

FIG. 1 is a side cross-sectional view of the present invention;

FIG. 2 is a side view of the present invention;

FIG. 3 is an enlarged schematic view of portion A shown in FIG. 1;

FIG. 4 is an enlarged schematic view of portion B shown in FIG. 1;

FIG. 5 is an enlarged schematic view of portion C shown in FIG. 3;

FIG. 6 is an enlarged schematic view of portion D shown in FIG. 3;

FIG. 7 is an enlarged schematic view of the portion E shown in FIG. 3;

FIG. 8 is an enlarged schematic view of portion F shown in FIG. 2;

FIG. 9 is an enlarged schematic view of the portion G shown in FIG. 2;

In the figure: 1. a fixed housing; 11. a first scale; 12. a second scale; 13. a first movable groove; 14. a first motor; 15. a first slider; 16. a first scale indicator; 17. a second slider; 18. a second scale indicator needle; 2. a polyethylene material extrusion structure; 21. extruding the housing; 22. an extrusion chamber; 23. a first extrusion screw; 24. a second extrusion screw; 25. a transmission rod; 26. a first worm wheel; 27. a second worm wheel; 28. a material bin; 3. extruding and forming a structure; 31. an extrusion rod; 311. cutting a groove; 32. extruding the barrel; 321. a chute; 33. a sliding barrel; 34. a sliding sleeve; 4. a pipe cutting structure; 5. a first cutting structure; 51. rotating the sleeve; 52. a second movable groove; 53. a second motor; 54. a motor drive shaft; 55. the extrusion is fast; 56. a T-shaped rotating plate; 57. a telescopic rod; 58. a cutting knife; 6. a scissors-type cutting structure; 61. a first cutting bar; 62. a first arc cutter; 63. a second cutting bar; 64. a second arc cutter; 7. a position control structure; 71. an extrusion structure; 711. a first rotating lever; 712. a second rotating lever; 713. an extrusion plate; 714. a third rotating lever; 715. a fourth rotating lever; 716. a fifth rotating lever; 717. and a sixth rotating rod.

Detailed Description

The invention is further described in connection with the following detailed description in order to make the technical means, the creation characteristics, the achievement of the purpose and the effect of the invention easy to understand.

As shown in fig. 1-9, the ultra-high molecular weight polyethylene pipe production equipment comprises a fixed shell 1, a polyethylene material extrusion structure 2 and an extrusion molding structure 3, wherein the polyethylene material extrusion structure 2 and the extrusion molding structure 3 are in sliding connection with the fixed shell 1, and a first movable groove 13 is formed in the top of the fixed shell 1;

the polyethylene material extrusion structure 2 comprises an extrusion shell 21, an extrusion cavity 22, a first extrusion screw 23, a second extrusion screw 24, a transmission rod 25, a first worm wheel 26, a second worm wheel 27 and a material bin 28, wherein the extrusion shell 21 is in sliding connection with the inner wall of the fixed shell 1, the first extrusion screw 23 and the second extrusion screw 24 are meshed, the first extrusion screw 23 and the second extrusion screw 24 are both in rotational connection with the extrusion shell 21, a first motor 14 is arranged in the fixed shell 1, a transmission shaft of the first motor 14 is fixedly connected with the second extrusion screw 24, the transmission rod 25 is fixedly connected with the first extrusion screw 23, and the first worm wheel 26 and the second worm wheel 27 are fixedly sleeved with the transmission rod 25 and the transmission shaft respectively. The specific use is as follows: the manual work adds the material to in the material storehouse 28, and the material can be because gravity effect whereabouts, starts first motor 14 this moment, and first motor 14 can drive two extrusion screw rods and do the rotation of opposite direction, carries the material that will heat forward, carries with the screw rod and can carry out abundant stirring and heating to the material, improves tubular product extrusion quality.

The top of the fixed shell 1 is provided with a first graduated scale 11 and a second graduated scale 12, one end of the second graduated scale 12 is welded with the top of the fixed shell 1, and the first graduated scale 11 is in sliding connection with the second graduated scale 12;

The top of the fixed shell 1 is provided with a first sliding block 15, the first sliding block 15 is in sliding sleeve joint with a second graduated scale 12, the bottom of the first sliding block 15 is fixedly connected with the top of the extrusion shell 21, the top of the extrusion shell 21 is provided with a first scale indicator 16, the bottom of the first scale indicator 16 is fixedly connected with the top of the extrusion shell 21, and the first scale indicator 16 points to a scale 0;

The top of the sliding sleeve 34 is provided with a second sliding block 17, the bottom of the second sliding block 17 is fixedly connected with the top of the sliding sleeve 34, the second sliding block 17 is in sliding connection with the first scale 11, the top of the sliding sleeve 34 is provided with a second scale indicating needle 18, the bottom of the second scale indicating needle 18 is fixedly connected with the top of the extrusion shell 21, and the second scale indicating needle 18 points to the scale 0. The specific use is as follows: when the pipe to be produced needs to be adjusted to the required length, the first sliding block 15 and the second sliding block 17 are only required to be shifted, the scale values pointed by the first scale pointer 16 and the second scale pointer 18 are observed while shifting, the values of the two scales are added, and the default pipe length is the length of the pipe to be produced at present, so that the length of the pipe to be produced can be freely controlled, and the plasticity is high.

The extrusion structure 3 comprises an extrusion rod 31, an extrusion barrel 32, a sliding chute 321, a sliding barrel 33 and a sliding sleeve 34, wherein the sliding barrel 33 is fixedly connected with the extrusion shell 21 in a sleeved mode, the extrusion barrel 32 is connected with the sliding barrel 33 in a sliding mode, the extrusion rod 31 is connected with the extrusion barrel 32 in a sliding mode, an annular cutting groove 311 is formed in the outer wall of the extrusion rod 31, and the sliding sleeve 34 is fixedly connected with the extrusion barrel 32 in a sleeved mode. The specific use is as follows: the distance between the sliding barrel 33 and the extrusion barrel 32 is adjusted, so that the discharging speed of the polyethylene material extrusion structure 2 can be changed, the density of the pipe finished product can be changed by changing the discharging speed, and the diversity of product manufacturing is realized.

A pipe cutting structure 4 is arranged at the top of the extrusion molding structure 3, and one end of the pipe cutting structure 4 is hinged with the top of the extrusion barrel 32;

the pipe cutting structure 4 comprises a first cutting structure 5, a shear type cutting structure 6 and a position control structure 7, wherein the first cutting structure 5 is hinged with the extrusion barrel 32, the position control structure 7 is fixedly connected with the top of the first cutting structure 5, and the shear type cutting structure 6 is rotatably connected with the inner wall of the fixed shell 1;

The first cutting structure 5 comprises a rotary sleeve 51, a second movable groove 52, a second motor 53, a motor transmission shaft 54, an extrusion block 55, a T-shaped rotary plate 56, a telescopic rod 57 and a cutting knife 58, wherein the rotary sleeve 51 is hinged to the top of the extrusion barrel 32, the T-shaped rotary plate 56 is rotatably connected with the rotary sleeve 51 in an inserting mode, one end of the T-shaped rotary plate 56 is fixedly connected with the motor transmission shaft 54, the extrusion block 55 is slidably connected with the T-shaped rotary plate 56 in a clamping mode, two ends of the telescopic rod 57 are fixedly connected with the motor transmission shaft 54 and the T-shaped rotary plate 56 respectively, and one end of the cutting knife 58 is fixedly connected with the T-shaped rotary plate 56 in an inserting mode. The specific use is as follows: starting a second motor 53 to drive a motor transmission shaft 54 to rotate, so as to drive a T-shaped rotating plate 56 and a cutting knife 58 to rotate, and cutting off the upper part of the pipe at the outlet of the pipe finished product; because the finished pipe is extruded outwards all the time, the expansion rod 57 is controlled to extend through the hydraulic pressure, so that the cutting position can move along with the extrusion of the pipe, and damage to the intact pipe caused by the cutting knife 58 when the cutting knife rotates is avoided.

The shear-type cutting structure 6 comprises a first cutting rod 61, a first arc-shaped cutting knife 62, a second cutting rod 63 and a second arc-shaped cutting knife 64, wherein the first cutting rod 61 and the second cutting rod 63 are both rotationally connected with the inner wall of the fixed shell 1, the first cutting rod 61 and the second cutting rod 63 are rotationally connected with each other, the first arc-shaped cutting knife 62 is fixedly connected with the first cutting rod 61, and the second arc-shaped cutting knife 64 is fixedly connected with the second cutting rod 63. The specific use is as follows: after the cutting of the top of the pipe is completed, the machine automatically controls the hydraulic mechanism to drive the first cutting structure 5 to rotate, thereby driving the rotation of the first rotary rod 711 and the second rotary rod 712, pushing the extrusion plate 713 forward, thereby pushing the third rotary rod 714 and the fourth rotary rod 715 outwards, and thus driving the first cutting rod 61 and the second cutting rod 63 to rotate around the central joint, the first arc cutting knife 62 and the second arc cutting knife 64 are in contact with the pipe and complete the cutting, the sizes of the two arc cutting knives are completely matched with the pipe, and the cut finished product has no quality defects such as burrs.

The position control structure 7 includes a first rotating rod 711, a second rotating rod 712, a pressing plate 713, a third rotating rod 714, a fourth rotating rod 715, a fifth rotating rod 716 and a sixth rotating rod 717, one end of the first rotating rod 711 is fixedly connected with the top of the T-shaped rotating plate 56, the other end of the first rotating rod 711 is connected with the second rotating rod 712 through a torsion spring, the bottom of the pressing plate 713 is hinged with the second rotating rod 712, two sides of the pressing plate 713 are slidably connected with the first movable groove 13 in an inserting manner, the third rotating rod 714 and the fourth rotating rod 715 are rotatably connected through torsion springs, the other ends of the third rotating rod 714 and the fourth rotating rod 715 are rotatably connected with the first cutting rod 61 and the second cutting rod 63 respectively, the fifth rotating rod 716 and the sixth rotating rod 717 are rotatably connected through torsion springs, and the other ends of the fifth rotating rod 716 and the sixth rotating rod 717 are rotatably connected with the first cutting rod 61 and the second cutting rod 63 respectively. The specific use is as follows: when the first cutting rod 61 and the second cutting rod 63 rotate around the central connection, the fifth rotating rod 716 and the sixth rotating rod 717 are driven to push inwards, so that the second rotating rod 712 is propped against the central connection to keep the stability of the structure, thereby playing an automatic role, avoiding possible errors caused by manual operation and improving the manufacturing efficiency.

Working principle: (1) material extrusion process: the material is manually added into the material bin 28, the material falls down due to the gravity, the first motor 14 is started at this time, and the first motor 14 drives the two extrusion screws to rotate in opposite directions, so that the heated material is conveyed forward.

(2) The length adjustment process of the pipe comprises the following steps: when the pipe to be produced needs to be adjusted to the required length, the first slide block 15 and the second slide block 17 are only required to be shifted, the scale values pointed by the first scale pointer 16 and the second scale pointer 18 are observed while shifting, and the values of the two scales are added together and the default pipe length is the length of the pipe currently produced.

(3) The first cutting process: after passing through the polyethylene material extrusion structure 2 and the extrusion molding structure 3, the cooled pipe can be cut when the pipe appears from the discharge hole; starting a second motor 53 to drive a motor transmission shaft 54 to rotate, so as to drive a T-shaped rotating plate 56 and a cutting knife 58 to rotate, and cutting off the upper part of the pipe at the outlet of the pipe finished product; since the finished tube is always extruded outwardly, the expansion of the expansion rod 57 is controlled hydraulically so that the cutting position can be moved with the extrusion of the tube.

(4) The second cutting process: after the cutting of the top of the pipe is completed, the machine automatically controls the hydraulic mechanism to drive the first cutting structure 5 to rotate, thereby driving the first rotary rod 711 and the second rotary rod 712 to rotate, pushing the extrusion plate 713 forward, thereby pushing the third rotary rod 714 and the fourth rotary rod 715 outwards, driving the first cutting rod 61 and the second cutting rod 63 to rotate around the central connection part, and driving the fifth rotary rod 716 and the sixth rotary rod 717 to push the second rotary rod 712 inwards, so as to keep the stability of the structure, at the moment, the first arc-shaped cutting knife 62 and the second arc-shaped cutting knife 64 are in contact with the pipe and complete the cutting, at the moment, the hydraulic mechanism is controlled again to reset the first cutting structure 5, so that the cutting of a section of pipe is completed.

The foregoing has shown and described the basic principles, principal features and advantages of the invention. It will be understood by those skilled in the art that the present invention is not limited to the foregoing examples, and that the foregoing description and description are merely illustrative of the principles of this invention, and various changes and modifications may be made without departing from the spirit and scope of the invention, which is defined in the appended claims. The scope of the invention is defined by the appended claims and equivalents thereof.

Claims

1. The utility model provides an ultra-high molecular weight polyethylene pipe production facility, includes fixed shell (1), polyethylene material extrusion structure (2) and extrusion structure (3), its characterized in that: the polyethylene material extrusion structure (2) and the extrusion forming structure (3) are in sliding connection with the fixed shell (1), a first movable groove (13) is formed in the top of the fixed shell (1), a first graduated scale (11) and a second graduated scale (12) are arranged on the top of the fixed shell (1), one end of the second graduated scale (12) is welded with the top of the fixed shell (1), and the first graduated scale (11) is in sliding connection with the second graduated scale (12);

The polyethylene material extrusion structure (2) comprises an extrusion shell (21), an extrusion cavity (22), a first extrusion screw (23), a second extrusion screw (24), a transmission rod (25), a first worm wheel (26), a second worm wheel (27) and a material bin (28), wherein the extrusion shell (21) is in sliding connection with the inner wall of a fixed shell (1), the first extrusion screw (23) and the second extrusion screw (24) are meshed, the first extrusion screw (23) and the second extrusion screw (24) are in rotary connection with the extrusion shell (21), a first motor (14) is arranged in the fixed shell (1), a transmission shaft of the first motor (14) is fixedly connected with the second extrusion screw (24), the transmission rod (25) is fixedly connected with the first extrusion screw (23), and the first worm wheel (26) and the second worm wheel (27) are respectively in fixed connection with the transmission rod (25) and the transmission shaft;

the extrusion molding structure (3) comprises an extrusion rod (31), an extrusion barrel (32), a sliding groove (321), a sliding barrel (33) and a sliding sleeve (34), wherein the sliding barrel (33) is fixedly connected with the extrusion shell (21) in an inserting mode, the extrusion barrel (32) is slidably connected with the sliding barrel (33) in an inserting mode, the extrusion rod (31) is slidably connected with the extrusion barrel (32) in an inserting mode, an annular cutting groove (311) is formed in the outer wall of the extrusion rod (31), and the sliding sleeve (34) is fixedly connected with the extrusion barrel (32) in a sleeving mode;

a pipe cutting structure (4) is arranged at the top of the extrusion forming structure (3), and one end of the pipe cutting structure (4) is hinged with the top of the extrusion barrel (32);

The top of the fixed shell (1) is provided with a first sliding block (15), the first sliding block (15) is in sliding sleeve joint with a second graduated scale (12), the bottom of the first sliding block (15) is fixedly connected with the top of the extrusion shell (21), the top of the extrusion shell (21) is provided with a first scale indicator (16), the bottom of the first scale indicator (16) is fixedly connected with the top of the extrusion shell (21), and the first scale indicator (16) points to a scale 0;

The top of the sliding sleeve (34) is provided with a second sliding block (17), the bottom of the second sliding block (17) is fixedly connected with the top of the sliding sleeve (34), the second sliding block (17) is in sliding connection with the first scale (11), the top of the sliding sleeve (34) is provided with a second scale indicating needle (18), the bottom of the second scale indicating needle (18) is fixedly connected with the top of the extrusion shell (21), and the second scale indicating needle (18) points to a scale 0;

The pipe cutting structure (4) comprises a first cutting structure (5), a shearing type cutting structure (6) and a position control structure (7), wherein the first cutting structure (5) is hinged with the extrusion barrel (32), the position control structure (7) is fixedly connected with the top of the first cutting structure (5), and the shearing type cutting structure (6) is rotatably connected with the inner wall of the fixed shell (1);

The first cutting structure (5) comprises a rotary sleeve (51), a second movable groove (52), a second motor (53), a motor transmission shaft (54), an extrusion block (55), a T-shaped rotary plate (56), a telescopic rod (57) and a cutting knife (58), wherein the rotary sleeve (51) is hinged to the top of the extrusion barrel (32), the T-shaped rotary plate (56) is rotationally inserted into the rotary sleeve (51), one end of the T-shaped rotary plate (56) is fixedly connected with the motor transmission shaft (54), the extrusion block (55) is in sliding clamping connection with the T-shaped rotary plate (56), two ends of the telescopic rod (57) are fixedly connected with the motor transmission shaft (54) and the T-shaped rotary plate (56) respectively, and one end of the cutting knife (58) is fixedly inserted into the T-shaped rotary plate (56);

The shear type cutting structure (6) comprises a first cutting rod (61), a first arc-shaped cutting knife (62), a second cutting rod (63) and a second arc-shaped cutting knife (64), wherein the first cutting rod (61) and the second cutting rod (63) are both rotationally connected with the inner wall of the fixed shell (1), the first cutting rod (61) and the second cutting rod (63) are rotationally connected with each other, the first arc-shaped cutting knife (62) is fixedly connected with the first cutting rod (61), and the second arc-shaped cutting knife (64) is fixedly connected with the second cutting rod (63);

The position control structure (7) comprises a first rotating rod (711), a second rotating rod (712), a squeezing plate (713), a third rotating rod (714), a fourth rotating rod (715), a fifth rotating rod (716) and a sixth rotating rod (717), one end of the first rotating rod (711) is fixedly connected with the top of the T-shaped rotating plate (56), the other end of the first rotating rod is connected with the second rotating rod (712) through a torsion spring, the bottom of the squeezing plate (713) is hinged with the second rotating rod (712), two sides of the squeezing plate (713) are in sliding connection with the first movable groove (13), the third rotating rod (714) and the fourth rotating rod (715) are in rotating connection through torsion springs, the other ends of the third rotating rod (714) and the fourth rotating rod (715) are respectively connected with the first cutting rod (61) and the second cutting rod (63), the other ends of the fifth rotating rod (716) and the sixth rotating rod (717) are respectively connected with the first cutting rod (61) and the second cutting rod (63) through torsion springs.