CN220428495U

CN220428495U - Fixed inner wall cutting device for polyethylene plastic steel winding pipe

Info

Publication number: CN220428495U
Application number: CN202321861068.XU
Authority: CN
Inventors: 杨进步; 牟其善; 王涛; 王龙
Original assignee: Shandong Haoyuan Pipe Industry Co ltd
Current assignee: Shandong Haoyuan Pipe Industry Co ltd
Priority date: 2023-07-14
Filing date: 2023-07-14
Publication date: 2024-02-02
Anticipated expiration: 2033-07-14

Abstract

The fixed inner wall cutting device of the polyethylene plastic steel winding pipe comprises a workbench and a pipe support, wherein a plurality of steel mould rods are circumferentially arranged on one side of the workbench, and spiral patterns are arranged on each steel mould rod. The utility model has the positive effects that: the utility model relates to a fixed inner wall cutting device of a polyethylene plastic steel winding pipe, which comprises a workbench, wherein one side of the workbench is provided with a plurality of circumferentially arranged steel mould bars which can spirally wind a plastic steel plate strip into a pipe, a cutting bracket and a rotatable cutting cutter shaft are arranged on a fixed platform which extends into the pipe in the circumferentially distributed steel mould bars, the cutting cutter shaft is provided with a plurality of cutting cutters which can rotationally realize the cutting of the protrusion of the inner wall of the pipe, the inner wall of the pipe is cut flat, and an automatic damping adjusting device can be arranged between the cutting cutter shaft and the fixed platform, so that the cutting depth can be adjusted according to different types of pipes, the smooth running of the cutting is ensured, and the purpose of enabling the inner wall of the pipe to be smooth is achieved.

Description

Fixed inner wall cutting device for polyethylene plastic steel winding pipe

Technical Field

The utility model relates to the technical field of pipe processing equipment, in particular to a fixed inner wall cutting device of a polyethylene plastic steel winding pipe.

Background

In the field of pipe processing and manufacturing at present, for producing pipes with larger pipe diameters, a production and manufacturing method for winding plastic steel plate strips into pipes is generally adopted, and the method has various advantages, for example, pipes with different pipe diameters can be wound into pipes by using the same plastic steel plate strip, and the manufacturing cost of a plastic steel plate strip die can be effectively reduced. However, the processing method has the fatal defect that adjacent plastic steel plate strips are thermally bonded together by the rubber material in the spiral winding process, spiral rubber material bulges or sags are formed on the inner wall of the pipe, the roughness of the inner wall of the pipe is increased, and the advantage of smoothness of the inner wall of the polyethylene pipe is greatly reduced.

Disclosure of Invention

The utility model aims to provide a fixed inner wall cutting device for a polyethylene plastic steel winding pipe, which cuts the bulges on the inner wall of the pipe flat by a plurality of cutting blades at high speed and stably and continuously so as to achieve the purpose of smoothing the inner wall of the pipe and solve the problems in the prior art.

The technical scheme adopted for solving the technical problems is as follows: the utility model provides a fixed inner wall cutting device of polyethylene plastic steel winding pipe, includes workstation and tubular product support, and a plurality of steel mould sticks of circumference arrangement are installed to workstation one side, all are equipped with the heliciform decorative pattern on each steel mould stick, the steel mould stick can synchronous rotation be with the plastic steel sheet area spiral winding processing of parcel in steel mould stick periphery into tubular product, still installs the fixed platform who stretches into inside tubular product on the workstation of the inside steel mould stick of circumference distribution, is equipped with the cutting support of arranging side by side on the fixed platform, installs rotatable cutting arbor between the cutting support, is equipped with the cutting sword on the cutting arbor, still install first motor on the fixed platform, the output shaft and the cutting sword axle of first motor are connected, and first motor start can drive the cutting sword and rotate and cut machine-formed tubular product inner wall. The second motor is installed at the bottom of the steel mould bars, the chain is installed on the output shaft of the second motor, the chain wheels are installed on the rotating shafts of the steel mould bars, the chain wheels are meshed with the chain, and the second motor can start to drive the steel mould bars to rotate. The output shaft of the first motor is provided with a speed reducer and a first belt pulley, one end of the cutting cutter shaft extending out of the cutting support is provided with a second belt pulley, and a belt is arranged between the first belt pulley and the second belt pulley in a matched mode. The two ends of the cutting cutter shaft in the length direction are arranged on a cutting support through a movable sleeve, a cutting cutter shaft guide groove matched with the movable sleeve is formed in the cutting support, cutter shaft ball bearings are arranged in the movable sleeve, the cutting cutter shaft is arranged between the two cutter shaft ball bearings in a matched mode, a damping jacking device is arranged between the movable sleeve and a fixed platform, and the damping jacking device always has a trend of descending the movable sleeve to the bottom of the cutting cutter shaft guide groove. An inclined angle exists between the trend direction of the cutting cutter shaft guide groove and the inner wall surface of the pipe, the cutting cutter shaft is under the action of a damping jacking device in the cutting cutter shaft guide groove, the cutting cutter is close to the inner wall of the pipe when the cutting cutter shaft moves downwards in the cutting cutter shaft guide groove, and the cutting cutter is far away from the inner wall of the pipe when the cutting cutter shaft moves upwards in the cutting cutter shaft guide groove. The cutting cutter shaft guide groove is arc-shaped and is matched with an arc taking the axis of the first motor as the center of a circle and taking the distance from the axis of the first motor to the cutting cutter shaft as the radius. The damping jacking device comprises an adjusting plate, wherein the adjusting plate is positioned between two cutting brackets, spring sleeves are respectively arranged at two ends of the length direction of the adjusting plate, damping springs are arranged in the spring sleeves in a matched mode, the damping springs are positioned between a movable sleeve and the spring sleeves, adjusting bolts are hinged to the bottom of a fixed platform, through holes matched with the adjusting bolts are formed in the adjusting plate, adjusting nuts are arranged outside the adjusting bolts at the upper side of the adjusting plate, and the adjusting nuts can be rotated to enable the adjusting plate to compress or stretch the damping springs. Still be equipped with damping damper in damping spring, damping damper is including the damping steel bar and the damping steel cylinder of mutually supporting, be equipped with the damping ring between damping steel bar and the damping steel cylinder, wherein the upper end of damping steel cylinder is fixed on the spring sleeve, the lower extreme of damping steel bar is fixed on moving the cover, install locking bolt in the damping steel cylinder, set up on regulating plate and the spring sleeve with locking bolt matched with screw hole, locking bolt stretches out the fixed rotor that sets up of one end of regulating plate, rotate the rotor and can let locking bolt and damping steel bar contact, let the damping spring between regulating plate and the moving cover no longer compressed. The damping jacking device comprises an adjusting plate, wherein the adjusting plate is positioned between two cutting brackets, two ends of the length direction of the adjusting plate are respectively provided with an elastic sheet steel cylinder and a damping steel cylinder which are communicated, the elastic sheet steel cylinder is positioned at the upper end of the damping steel cylinder, the diameter of the elastic sheet steel cylinder is larger than that of the damping steel cylinder, a plurality of shock-absorbing steel sheets are installed in the elastic sheet steel cylinder, damping steel rods are installed in the damping steel cylinder in a matched manner, the shock-absorbing steel sheets are positioned at the upper end of the damping steel rods, the damping steel rods are fixed on a movable sleeve, an adjusting bolt is hinged to the bottom of a fixed platform, a through hole matched with the adjusting bolt is formed in the adjusting plate, an adjusting nut is installed outside the adjusting bolt at the upper side of the adjusting plate, the adjusting nut is rotated to enable the adjusting plate to compress or stretch the shock-absorbing steel sheets, a locking bolt is also installed at the upper end of the elastic sheet steel cylinder, threaded holes matched with the locking bolt are formed in the adjusting plate and the spring sleeve, one end of the locking bolt extends out of the adjusting plate is fixedly provided with a rotating sheet, and the locking bolt is enabled to form hard contact connection with the shock-absorbing steel sheets and the damping steel rods. The middle position of the cutting knife is provided with a fixed sleeve matched with the cutting knife shaft, both ends of the length direction of the cutting knife are provided with cutting edges, and an included angle between the cutting edges at both ends is 180 degrees. And a plurality of groups of cutters which are arranged side by side are arranged on the cutting cutter shaft, and the installation and rotation angles of the cutters of each group on the cutting cutter shaft are different.

The utility model has the positive effects that: the utility model relates to a fixed inner wall cutting device of a polyethylene plastic steel winding pipe, which comprises a workbench, wherein one side of the workbench is provided with a plurality of circumferentially arranged steel mould bars which can spirally wind a plastic steel plate strip into a pipe, a cutting bracket and a rotatable cutting cutter shaft are arranged on a fixed platform which extends into the pipe in the circumferentially distributed steel mould bars, the cutting cutter shaft is provided with a plurality of cutting cutters which can rotationally realize the cutting of the protrusion of the inner wall of the pipe, the inner wall of the pipe is cut flat, and an automatic damping adjusting device can be arranged between the cutting cutter shaft and the fixed platform, so that the cutting depth can be adjusted according to different types of pipes, the smooth running of the cutting is ensured, and the purpose of enabling the inner wall of the pipe to be smooth is achieved.

Drawings

FIG. 1 is a schematic three-dimensional structure of the present utility model;

FIG. 2 is a front view of the present utility model;

FIG. 3 is a right side view of FIG. 2;

FIG. 4 is a cross-sectional view taken along line A-A of FIG. 2;

FIG. 5 is an enlarged view of the B-B cross-sectional view of FIG. 2;

FIG. 6 is a schematic structural view of a damped jacking device;

FIG. 7 is a schematic view of another embodiment of a damped jacking device;

fig. 8 is a partial enlarged view of I in fig. 7.

Detailed Description

The utility model relates to a fixed inner wall cutting device of a polyethylene plastic steel winding pipe, which is shown in figures 1-3, and comprises a workbench 1 and a pipe bracket 13, wherein the workbench 1 is vertically arranged, and the pipe bracket 13 is used for receiving a processed formed pipe 12. For realizing the winding of plastic steel plate strip into the pipe, a plurality of steel mould bars 3 that circumference was arranged are installed to workstation 1 one side, all are equipped with the heliciform decorative pattern on each steel mould bar 3, because the setting of heliciform decorative pattern, the plastic steel plate strip 2 of winding on steel mould bar 3 can follow the rotation of steel mould bar 3 and carry out spiral winding, form complete tubular product 12 and forward rotatory precession, promptly steel mould bar 3 can synchronous rotation will wrap up at the plastic steel plate strip 2 spiral winding processing of steel mould bar 3 periphery into tubular product 12.

The inner wall of the pipe 12 manufactured by the processing mode is provided with the bulge, so that the inner wall of the pipe is smoother, the bulge is cut, the workbench 1 inside the steel mould rod 3 is further provided with the fixing platform 8 extending into the pipe, and the fixing platform 8 extends into the pipe from the middle of the circumferentially distributed steel mould rod 3. The fixed platform 8 is provided with cutting brackets 10 which are arranged side by side, a rotatable cutting knife shaft 14 is arranged between the cutting brackets 10, and a cutting knife 11 is arranged on the cutting knife shaft 14. Wherein the cutting support 10 is advanced to leave the action range of the steel mould rod 3, so as to ensure the corresponding processing of the inner peripheral wall of the formed pipe, and avoid the interference of the cutting knife 11 and the steel mould rod 3.

The fixed platform 8 is also provided with a first motor 4, an output shaft of the first motor 4 is connected with a cutting cutter shaft 14, the first motor 4 is started to drive a cutting cutter 11 to rotate so as to cut the inner wall of the pipe 12 which is formed by machining, the bulge on the inner wall of the pipe is removed, and the purpose that the inner wall of the pipe is relatively smooth is achieved.

The synchronous rotation of the steel mould bars 3 can be realized through the driving of servo motors on respective rotating shafts, further, in order to realize the synchronous rotation of the steel mould bars 3 and effectively reduce the use of a power driving mechanism, the manufacturing cost is reduced, a second motor 26 is installed at the bottom of the steel mould bars 3, a chain 27 is installed on the output shaft of the second motor 26, chain wheels 28 are installed on the rotating shafts of a plurality of steel mould bars 3, the chain wheels 28 are meshed with the chain 27, the second motor 26 is started to drive the steel mould bars 3 to rotate, and the plastic steel plate belt 2 is spirally wound to form a pipe.

In order to realize the stable power transmission of the rotation of the cutting knife shaft 14, the output shaft of the first motor 4 is provided with a speed reducer 5 and a first belt pulley 6, one end of the cutting knife shaft 14 extending out of the cutting bracket 10 is provided with a second belt pulley 29, a belt 7 is cooperatively arranged between the first belt pulley 6 and the second belt pulley 29, and the first motor 4 is started to drive the cutting knife shaft 14 and the cutting knife 11 to rotate through the transmission of the belt pulley and the belt 7 so as to cut the inner wall of the pipe.

Further, in order to realize the mounting of the cutting arbor 14 on the cutting holder 10 and the relative rotation of the cutting arbor 14, both ends in the longitudinal direction of the cutting arbor 14 are mounted on the cutting holder 10 through the moving sleeve 33. Cutting support 10 is provided with cutting arbor guide slot 15 matched with movable sleeve 33, arbor ball bearings 16 are installed in movable sleeve 33, cutting arbor 14 is installed between two arbor ball bearings 16 in a matched mode, cutting arbor 14 can rotate at high speed in arbor ball bearings 16, cutting arbor 14 is fixedly connected with the inner ring of arbor ball bearings 16, and movable sleeve 33 is fixedly connected with the outer ring of arbor ball bearings 16. A damping jacking device 9 is arranged between the movable sleeve 33 and the fixed platform 8, and the damping jacking device 9 always has a trend of pushing the movable sleeve 33 to descend to the bottom of the cutter shaft guide groove 15. The cutting knife shaft guide groove 15 and the damping jacking device 9 can adaptively adjust the cutting knife depth according to the protruding height state in the inner wall of the pipe, so that the purpose of enabling the inner wall of the pipe to be smooth is achieved.

As shown in fig. 3, the rotation direction of the cutter 11 is clockwise, so that the cutting force of the cutter 11 to the pipe wall is inclined downward, the reaction force of the pipe wall to the cutter 11 is inclined upward, and when the force is too large, the cutter shaft 14 is pushed obliquely upward along the cutter shaft guide groove 15, so that the cutting depth is reduced, and when the resistance is reduced, the elastic pressure of the damping jacking device 9 to the cutter shaft 14 pushes the cutter shaft 14 to the original position, and the cutting amplitude is changed very little in the cutting process, so as to ensure the cutting stability.

The trend direction of the cutting knife shaft guide groove 15 has a certain inclination angle with the inner wall of the pipe, the cutting knife shaft 14 is acted by the damping jacking device 9 in the cutting knife shaft guide groove 15, the cutting knife 11 is close to the inner wall of the pipe when moving downwards, the cutting knife 11 is far away from the inner wall of the pipe when moving upwards, and the cutting depth of the cutting knife 11 to the inner wall of the pipe is adjusted through the vertical movement of the cutting knife shaft 14 in the cutting knife shaft guide groove 15.

When the cutting depth is adjusted, as the cutting knife shaft 14 is connected with the damping jacking device 9 and is controlled by the damping jacking device, the cutting knife shaft 14 can vertically move in the cutting knife shaft guide groove 15, in order to ensure that the belt 7 for rotating power transmission can not be loosened after the cutting knife shaft 14 moves, the cutting knife shaft guide groove 15 is arc-shaped and is matched with an arc taking the axis of the first motor 4 as the center of a circle and the distance from the axis of the first motor 4 to the cutting knife shaft 14 as the radius, thus the distance between the first belt pulley 6 and the second belt pulley 29 can not be changed no matter the cutting knife shaft 14 is positioned at any position in the cutting knife shaft guide groove 15, the belt 7 matched with the cutting knife shaft guide groove can not be changed in tightness, normal rotating driving of the cutting knife shaft 14 can be ensured, and the cutting depth of the inner wall of a pipe can be changed, and the normal rotating cutting of the cutting knife 11 can be maintained.

Further, as shown in fig. 6, the damping jacking device 9 includes an adjusting plate 30, and the adjusting plate 30 is located between two cutting brackets 10. Spring sleeves 18 are arranged at two ends of the length direction of the adjusting plate 30, damping springs 17 are arranged in the spring sleeves 18 in a matched mode, and the damping springs 17 are located between the movable sleeve 33 and the spring sleeves 18, so that elastic adjustment of the cutting knife shaft 14 located in the cutting knife shaft guide groove 15 can be achieved.

In order to realize the adjustment of the pretightening force of the damping spring 17, an adjusting bolt 21 is hinged at the bottom of the fixed platform 8, a through hole matched with the adjusting bolt 21 is formed in the adjusting plate 30, an adjusting nut 22 is arranged outside Zhou Peige of the adjusting bolt 21 at the upper side of the adjusting plate 30, the adjusting nut 22 is rotated to enable the adjusting plate 30 to compress or stretch the damping spring 17, the pretightening force of the damping spring 17 is further adjusted, and meanwhile, the tightness of the integral damping jacking device 9, or the initial positions of the cutting cutter shaft 14 and the cutting blade 11, are adjusted.

Further, a damping and shock absorbing mechanism is further arranged in the shock absorbing spring 17 and comprises a damping steel rod 19 and a damping steel cylinder 20 which are matched with each other, a damping ring 31 is arranged between the damping steel rod 19 and the damping steel cylinder 20, the upper end of the damping steel cylinder 20 is fixed on the spring sleeve 18, and the lower end of the damping steel rod 19 is fixed on the movable sleeve 33. Wherein the cutter shaft 14 is arranged in the cutter shaft guide groove 15 through the cutter shaft ball bearing 16 and the moving sleeve 33, and is connected with the damping spring 17 and the damping steel rod 19 through the moving sleeve 33.

When the cutting pressure is overlarge, the stress of the cutting knife 11 acts on the damping steel rod 19 through the cutting knife shaft 14, the lifting damping spring 17 obliquely reduces the cutting pressure, and meanwhile, the damping steel rod 19 consumes impact energy under the action of sealing friction force in the damping steel cylinder 20, so that excessive impact is avoided. When the cutting pressure is smaller, the damping spring 17 can push the cutting cutter shaft 14 back to the original position, so that the elastic adjustment of the cutting depth is realized, the smoothness of the inner wall of the pipe is ensured, and the service life of the cutter can be effectively prolonged.

When the damping jacking device 9 is not required to act, the damping jacking device 9 can be locked, in order to achieve the purpose, a locking bolt 23 is arranged in the damping steel cylinder 20, threaded holes matched with the locking bolt 23 are formed in the adjusting plate 30 and the spring sleeve 18, one end of the locking bolt 23 extending out of the adjusting plate 30 is fixedly provided with a rotating plate 24, the rotating plate 24 can enable the locking bolt 23 to be in contact with the damping steel rod 19, the damping spring 17 between the adjusting plate 30 and the moving sleeve 33 is not compressed any more, hard connection is achieved between the adjusting plate 30 and the moving sleeve 33, and elastic floating can not occur any more.

Further, in another structural embodiment of the damping jacking device 9, as shown in fig. 7, the damping jacking device 9 includes an adjusting plate 30, the adjusting plate 30 is located between two cutting brackets 10, two ends of the adjusting plate 30 in the length direction are respectively provided with a spring steel cylinder 32 and a damping steel cylinder 20 which are communicated, the spring steel cylinders 32 are located at the upper ends of the damping steel cylinders 20, and the diameter of the spring steel cylinders 32 is larger than that of the damping steel cylinders 20.

A plurality of shock-absorbing steel plates 25 are arranged in the elastic sheet steel cylinder 32, a damping steel rod 19 is arranged in the damping steel cylinder 20 in a matched mode, the shock-absorbing steel plates 25 are arranged at the upper end of the damping steel rod 19, the damping steel rod 19 is fixed on the movable sleeve 33, and elastic adjustment of the cutting cutter shaft 14 can be achieved through the shock-absorbing steel plates 25.

In order to realize the adjustment of the pretightening force of the shock-absorbing steel sheet 25, an adjusting bolt 21 is hinged at the bottom of the fixed platform 8, a through hole matched with the adjusting bolt 21 is formed in the adjusting plate 30, an adjusting nut 22 is arranged outside Zhou Peige of the adjusting bolt 21 at the upper side of the adjusting plate 30, the adjusting nut 22 is rotated to enable the adjusting plate 30 to compress or stretch the shock-absorbing steel sheet 25, the pretightening force of the shock-absorbing steel sheet 25 is further adjusted, and meanwhile, the tightness of the integral damping jacking device 9, or the initial positions of the cutting cutter shaft 14 and the cutting blade 11, are adjusted.

The shock-absorbing steel sheets 25 are mutually meshed and crossed by the left and right groups of arc-shaped steel sheets to be inserted into the gap of the opposite side, when the pressure is increased, the shock-absorbing steel sheets 25 are pressed by the damping steel rods 19, so that the two groups of steel sheets are mutually rubbed and extend into the gap of the opposite side, the impact is quite damped, and when the pressure is relieved, the shock-absorbing steel sheets 25 can rebound to the original state, and the cutting knife shaft 14 and the cutting knife 11 are pushed to move and reset.

When the damping jacking device 9 is not required to act, the damping jacking device 9 can be locked, in order to achieve the purpose, the upper end of the elastic sheet steel cylinder 32 is further provided with a locking bolt 23, the adjusting plate 30 and the spring sleeve 18 are provided with threaded holes matched with the locking bolt 23, one end of the locking bolt 23 extending out of the adjusting plate 30 is fixedly provided with a rotating plate 24, the rotating plate 24 can enable the locking bolt 23 to form hard contact connection with the shock-absorbing steel sheet 25 and the damping steel rod 19, the shock-absorbing steel sheet 25 is not compressed any more, the hard connection between the adjusting plate 30 and the moving sleeve 33 is achieved, and elastic floating can not occur any more.

Further, the middle position of the cutter 11 is provided with a fixed sleeve matched with the cutter shaft 14, both ends of the cutter 11 in the length direction are provided with cutting edges, an included angle between the cutting edges at both ends is 180 degrees, and the cutting edges with the structure can enable the cutter 11 to be more stable in rotation and achieve accurate cutting of the inner wall of the pipe.

Further, in order to meet the cutting requirements of different types of pipes and different thicknesses, a plurality of groups of cutters 11 are arranged side by side on the cutter shaft 14, and the installation rotation angles of the cutter groups 11 on the cutter shaft 14 are different.

The primary problem of realizing accurate cutting is the stable balance problem of the device, and the cutting knife device is directly installed on the fixed platform 8, and the platform and the workbench 1 are firmly and reliably connected together, so that the high-precision operation of the system is ensured. The device utilizes a plurality of milling cutters to cut continuously at a high speed, thereby greatly improving the work efficiency. The device design of the cutter 11 rotation is driven by a belt, and a plurality of belt pulleys can be arranged at each end to work together, and 2, 3 or even 4 belt pulleys can work simultaneously to ensure the stability of the driving.

The pipe material also runs in a spiral shape during the operation of the device, but the pipe material runs slowly, a certain linear speed of the cutting blade is required to ensure the cutting effect, and particularly, the device is relatively close to the inner wall of the pipe material, and the cutter arm is relatively short, so that the pipe material is stable, but the rotating speed of the cutting blade is required to be increased to maintain the equivalent cutting linear speed, and the rotating speed can be designed to be different from 1400 rpm to 2800 rpm according to different conditions.

The technical scheme of the utility model is not limited to the scope of the embodiments of the utility model. The technical content that is not described in detail in the utility model is known in the prior art.

Claims

1. The utility model provides a fixed inner wall cutting device of polyethylene plastic steel winding pipe which characterized in that: including workstation (1) and tubular product support (13), a plurality of steel mould bars (3) that circumference was arranged are installed to workstation (1) one side, all are equipped with heliciform decorative pattern on each steel mould bar (3), steel mould bar (3) can synchronous rotation with wrap up in the spiral winding of plastic steel sheet area (2) of steel mould bar (3) periphery and process into tubular product (12), still install fixed platform (8) that stretch into tubular product inside on workstation (1) inside steel mould bar (3) of circumference distribution, be equipped with cutting support (10) of arranging side by side on fixed platform (8), install rotatable cutting arbor (14) between cutting support (10), be equipped with cutting sword (11) on cutting arbor (14), still install first motor (4) on fixed platform (8), the output shaft and the cutting arbor (14) of first motor (4) are connected, and first motor (4) start can drive cutting sword (11) and rotate and cut the inside wall of tubular product (12) of processing shaping.

2. A polyethylene plastic steel wound pipe fixed inner wall cutting device according to claim 1, wherein: a second motor (26) is arranged at the bottom of the steel mould rods (3), a chain (27) is arranged on an output shaft of the second motor (26), chain wheels (28) are arranged on rotating shafts of the steel mould rods (3), the chain wheels (28) are meshed with the chain (27), and the second motor (26) can be started to drive the steel mould rods (3) to rotate.

3. A polyethylene plastic steel wound pipe fixed inner wall cutting device according to claim 1, wherein: the output shaft of the first motor (4) is provided with a speed reducer (5) and a first belt pulley (6), one end of the cutting cutter shaft (14) extending out of the cutting support (10) is provided with a second belt pulley (29), and a belt (7) is arranged between the first belt pulley (6) and the second belt pulley (29) in a matched mode.

4. A polyethylene plastic steel wound pipe fixed inner wall cutting device according to claim 1, wherein: the cutting tool is characterized in that two ends of the cutting tool shaft (14) in the length direction are mounted on a cutting support (10) through a moving sleeve (33), a cutting tool shaft guide groove (15) matched with the moving sleeve (33) is formed in the cutting support (10), tool shaft ball bearings (16) are mounted in the moving sleeve (33), the cutting tool shaft (14) is mounted between the two tool shaft ball bearings (16) in a matched mode, a damping jacking device (9) is mounted between the moving sleeve (33) and a fixed platform (8), and the damping jacking device (9) always has a trend of descending the moving sleeve (33) to the bottom of the cutting tool shaft guide groove (15).

5. The polyethylene plastic steel wound pipe fixed inner wall cutting device according to claim 4, wherein: an inclination angle exists between the trend direction of the cutting cutter shaft guide groove (15) and the inner wall surface of the pipe (12), the cutting cutter shaft (14) is prevented from being lifted by the damping jacking device (9) in the cutting cutter shaft guide groove (15), the cutting cutter (11) is close to the inner wall of the pipe (12) when the cutting cutter shaft (14) moves downwards in the cutting cutter shaft guide groove (15), and the cutting cutter (11) is far away from the inner wall of the pipe (12) when the cutting cutter shaft (14) moves upwards in the cutting cutter shaft guide groove (15).

6. The polyethylene plastic steel wound pipe fixed inner wall cutting device according to claim 4, wherein: the cutter shaft guide groove (15) is arc-shaped and is matched with an arc taking the axis of the first motor (4) as a center of a circle and taking the distance from the axis of the first motor (4) to the cutter shaft (14) as a radius.

7. The polyethylene plastic steel wound pipe fixed inner wall cutting device according to claim 4, wherein: the damping jacking device (9) comprises an adjusting plate (30), wherein the adjusting plate (30) is located between two cutting brackets (10), spring sleeves (18) are arranged at two ends of the length direction of the adjusting plate (30), damping springs (17) are arranged in the spring sleeves (18) in a matched mode, the damping springs (17) are located between moving sleeves (33) and the spring sleeves (18), adjusting bolts (21) are hinged to the bottom of a fixed platform (8), through holes matched with the adjusting bolts (21) are formed in the adjusting plate (30), adjusting nuts (22) are arranged outside Zhou Peige of the adjusting bolts (21) on the upper side of the adjusting plate (30), and the adjusting nuts (22) are rotated to enable the adjusting plate (30) to compress or stretch the damping springs (17).

8. The polyethylene plastic steel wound pipe fixed inner wall cutting device according to claim 7, wherein: still be equipped with damping damper in damping spring (17), damping damper is including damping steel bar (19) and damping steel cylinder (20) that mutually support, be equipped with damping ring (31) between damping steel bar (19) and damping steel cylinder (20), wherein the upper end of damping steel cylinder (20) is fixed on spring sleeve (18), the lower extreme of damping steel bar (19) is fixed on moving sleeve (33), install locking bolt (23) in damping steel cylinder (20), set up on adjusting plate (30) and spring sleeve (18) with locking bolt (23) matched with screw hole, locking bolt (23) stretch out the fixed rotating piece (24) that sets up of one end of adjusting plate (30), rotating piece (24) can let locking bolt (23) and damping steel bar (19) contact, damping spring (17) between adjusting plate (30) and moving sleeve (33) no longer compressed.

9. The polyethylene plastic steel wound pipe fixed inner wall cutting device according to claim 4, wherein: the damping jacking device (9) comprises an adjusting plate (30), wherein the adjusting plate (30) is positioned between two cutting brackets (10), two ends of the length direction of the adjusting plate (30) are respectively provided with a spring plate steel cylinder (32) and a damping steel cylinder (20) which are communicated, the spring plate steel cylinder (32) is positioned at the upper end of the damping steel cylinder (20), the diameter of the spring plate steel cylinder (32) is larger than that of the damping steel cylinder (20), a plurality of shock-absorbing steel sheets (25) are arranged in the spring plate steel cylinder (32), a damping steel rod (19) is arranged in the damping steel cylinder (20) in a matched manner, the shock-absorbing steel sheets (25) are positioned at the upper end of the damping steel rod (19), the damping steel rod (19) is fixed on a moving sleeve (33), an adjusting bolt (21) is hinged to the bottom of a fixed platform (8), a through hole matched with the adjusting bolt (21) is formed in the adjusting plate (30), an adjusting nut (22) is arranged outside the adjusting bolt (21) at the upper side of the adjusting plate (30), the adjusting nut (22) is arranged in a rotating mode, the adjusting nut (22) can enable the adjusting plate (30) or the damping steel sheet (25) to be compressed, the damping steel rod (19) is arranged at the upper end of the spring plate (23) in a matched manner, the locking sleeve (23) is also arranged on the spring plate (23), one end of the locking bolt (23) extending out of the adjusting plate (30) is fixedly provided with a rotating sheet (24), and the rotating sheet (24) can enable the locking bolt (23) to form hard contact connection with the shock-absorbing steel sheet (25) and the damping steel rod (19), so that the shock-absorbing steel sheet (25) is not compressed any more.

10. A polyethylene plastic steel wound pipe fixed inner wall cutting device according to claim 1, wherein: the middle position of the cutting knife (11) is provided with a fixed sleeve matched with the cutting knife shaft (14), both ends of the cutting knife (11) in the length direction are provided with cutting edges, and an included angle between the cutting edges at both ends is 180 degrees.

11. A polyethylene plastic steel wound pipe fixed inner wall cutting device according to claim 1, wherein: a plurality of groups of cutters (11) which are arranged side by side are arranged on the cutter shaft (14), and the installation rotation angles of the cutters (11) of each group on the cutter shaft (14) are different.