CN218397303U

CN218397303U - Polymer large-diameter pipeline forming device

Info

Publication number: CN218397303U
Application number: CN202221953841.0U
Authority: CN
Inventors: 侯昌强; 马坤林
Original assignee: Sichuan Yida Pipe Industry Co ltd
Current assignee: Sichuan Yida Pipe Industry Co ltd
Priority date: 2022-07-27
Filing date: 2022-07-27
Publication date: 2023-01-31
Anticipated expiration: 2032-07-27

Abstract

The utility model relates to a pipeline production facility technical field, the utility model provides a big footpath pipeline forming device of polymer, forming device sets up on the make-up machine, forming device is used for carrying out the shaping operation to the pipeline, including a shaping section of thick bamboo, a polishing section of thick bamboo and a location section of thick bamboo, a shaping section of thick bamboo, a polishing bucket and a location section of thick bamboo all set up in the make-up machine, a polishing section of thick bamboo both ends still are provided with annular convex part, the annular convex part adaptation cover at a polishing section of thick bamboo both ends is established on a shaping section of thick bamboo and a location section of thick bamboo, a polishing section of thick bamboo rotates, the groove of polishing has still been seted up on the polishing section of thick bamboo inner wall, the inslot of polishing still is provided with the gyro wheel of polishing, mounting bracket and control mechanism, the gyro wheel both ends of polishing all rotate and are provided with the mounting bracket, the mounting bracket activity sets up at the inslot of polishing, control mechanism is used for driving the mounting bracket to remove the groove removal, the gyro wheel of polishing and pipeline surface contact, the utility model provides a forming device capable of getting rid of removing the unsmooth vestige of pipeline surface.

Description

Polymer large-diameter pipeline forming device

Technical Field

The utility model relates to a pipeline production equipment technical field, especially a big footpath pipeline forming device of polymer.

Background

The high molecular polyethylene pipe is named as ultra-high molecular weight polyethylene (UHMW-PE) pipe, and is a novel plastic pipe with abrasion resistance, impact resistance, corrosion resistance, impact energy absorption, no scale formation, no water absorption and extremely small self-lubricating friction coefficient. The production of such pipes uses extruders, which are important mechanical devices in plastic processing and molding, and usually comprise a transmission device, a feeding device, a charging barrel, a screw, a head and a die. The plastic material enters the extruder from the feeding device, is conveyed forward under the drive of the rotation of the screw rod, is heated by the charging barrel and is sheared and compressed by the screw rod to be melted in the forward movement process, so that the change from a glass state to a high-elastic state and then a viscous state is realized, the viscous state material is conveyed to the machine head under the drive of the screw rod and then passes through a cooling device arranged on the machine head, and the viscous state material is cooled and shaped in the cooling device and leaves the extruder to form a workpiece to be processed. In conventional pipeline production process, the pipeline stock of viscous state can get into the make-up machine and adsorb the design to its outside profile after being extruded the rudiment that forms the pipeline, and the pipeline can be because of the convex vestige appears in the surface atress by the adsorption process, and the adhesion appears on pipeline surface probably and forming device surface simultaneously, and the pipeline surface that leads to making appears unevenness's vestige, influences pipeline finished product quality.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to overcome prior art's shortcoming, provide one kind and can get rid of the irregular vestige of pipeline surface, let pipeline surface keep glossy forming device.

The purpose of the utility model is realized through the following technical scheme:

the utility model provides a big footpath pipeline forming device of polymer, forming device sets up on the make-up machine, forming device is used for carrying out the shaping operation to the pipeline, including a shaping section of thick bamboo, a polishing section of thick bamboo and a location section of thick bamboo, a shaping section of thick bamboo, a polishing section of thick bamboo and a location section of thick bamboo all set up in the make-up machine, shaping section of thick bamboo one end and make-up machine feed inlet intercommunication, the polishing section of thick bamboo both ends still are provided with annular convex part, the annular convex part adaptation cover at polishing section of thick bamboo both ends is established a shaping section of thick bamboo with on the location section of thick bamboo, a location section of thick bamboo passes through structure pole and make-up machine inner wall rigid coupling, a shaping section of thick bamboo, a polishing section of thick bamboo and a location section of thick bamboo coaxial setting and inside intercommunication, a polishing section of thick bamboo rotates under the drive of motor, the polishing section of thick bamboo still has seted up the groove of polishing on the polishing section of thick bamboo inner wall, still be provided with polishing gyro wheel, mounting bracket, be provided with all rotate at the polishing gyro wheel both ends the mounting bracket, be used for the drive gyro wheel pivoted motor setting on the mounting bracket, two the mounting bracket mirror image sets up the polishing inslot of polishing, the polishing groove, control mechanism sets up the polishing inslot, control mechanism sets up the polishing groove is in the polishing.

The effect of adopting above-mentioned technical scheme does, and the pipeline gets into a shaping section of thick bamboo, is adsorbed to its outer wall by a shaping section of thick bamboo, makes the pipeline outer wall can become regular pipe form, and the pipeline passes a shaping section of thick bamboo and gets into a section of thick bamboo of polishing, and a section of thick bamboo of polishing constantly rotates under the effect of motor, and the gyro wheel of polishing rotates around the pipeline along with the rotation of a section of thick bamboo of polishing, and gyro wheel self of polishing simultaneously also carries out the rotation that self leads to self under the effect of motor and polishes the pipeline surface.

As a further improvement of the above scheme, the mounting bracket is an L-shaped structural plate, the long side of the mounting bracket is connected with the polishing roller in a rotating manner, the two side edges of the polishing groove are provided with limit grooves, two the mounting bracket corresponds to two of the limit grooves, the short side of the mounting bracket is movably clamped in the limit grooves, and the length direction of the limit grooves is parallel to the diameter direction of the polishing barrel.

Adopt above-mentioned technical scheme's effect to be connected, the long limit of mounting bracket and the gyro wheel rotation of polishing, and the long limit lets the gyro wheel of polishing can be whole stretches out from the inslot of polishing with being connected of the gyro wheel of polishing, and the minor face activity card of mounting bracket is established at the spacing inslot, is limited for the removal with the active mode of mounting bracket, restricts the activity direction of mounting bracket simultaneously.

As a further improvement of the above scheme, the control mechanism is a screw rod, the screw rod is rotatably arranged in the grinding groove, the axis of the screw rod is perpendicular to the axis of the grinding cylinder, and the mounting rack is in threaded connection with the screw rod.

The effect of adopting above-mentioned technical scheme does, and the lead screw rotates the axial that the manipulation mounting bracket moved along the lead screw to drive the axial displacement of gyro wheel along the lead screw of polishing.

As a further improvement of the scheme, the polishing machine further comprises a water cooling system, wherein the water cooling system comprises a water delivery pipe and a plurality of water spray nozzles arranged on the surface of the water delivery pipe, the water cooling system is arranged in the polishing groove, a plurality of nozzles forming the water cooling system are opposite to the polishing roller, a water storage tank is also arranged on the outer side of the polishing barrel, and the water cooling system is communicated with the water storage tank.

The effect of adopting above-mentioned technical scheme does, and pipeline stock surface temperature is higher, and the nozzle that constitutes water cooling system can spray water to the gyro wheel surface of polishing, and the help gyro wheel of polishing cools down.

As a further improvement of the scheme, the polishing device further comprises a cleaning device, the cleaning device is arranged on the inner wall of the polishing barrel, the cleaning device is arranged beside the polishing groove and comprises a scraper and a spring, the bottom edge profile of the scraper is matched and attached to the inner wall of the polishing barrel in a matching mode, the scraper is in sliding fit with the inner wall of the polishing barrel, one end of the spring is connected to the scraper, and the spring pushes the scraper to be in contact with the polishing roller.

Adopt above-mentioned technical scheme's effect to do, the incomplete bits of polishing from the pipeline on can the adhesion of the gyro wheel surface of polishing in the rotation, and the scraper blade is promoted by the spring and is polished gyro wheel in close contact with, and the scraper blade can be scraped off the incomplete bits on gyro wheel surface of polishing.

As a further improvement of the scheme, the cleaning device further comprises a limiting cover, the limiting cover is arranged on the inner wall of the polishing barrel, a through hole is formed in one side, close to the polishing roller, of the limiting cover, the scraper is in sliding fit with the through hole of the limiting cover, the other end of the spring is connected to the inner wall of the limiting cover, and the limiting cover pushes the scraper to be in contact with the inner wall of the polishing barrel.

Adopt above-mentioned technical scheme's effect to do, spacing cover cuts apart scraper blade and spring and pipeline, and spacing cover also restricts the removal and the deformation direction of scraper blade and spring simultaneously.

As a further improvement of the scheme, a plurality of annular grooves are circumferentially arrayed on the inner wall of the forming barrel, a plurality of shaping holes are circumferentially arrayed at the bottom of the annular groove closest to a feed inlet of the forming machine in the forming barrel and communicated with the output end of an external vacuum machine, the inner wall of the forming barrel is in contact with the surface of an official channel, and the diameter of the inner wall of the grinding barrel is smaller than that of the inner wall of the forming barrel.

The effect of adopting above-mentioned technical scheme does, and the pipeline outer wall can be adsorbed by the internal pressure of the ring channel that is connected with the vacuum machine, lets the pipeline outer wall hug closely the shaping section of thick bamboo inner wall.

As a further improvement of the scheme, the inner wall of the positioning cylinder is of a funnel-shaped structure, and the wide end of the inner wall of the positioning cylinder is connected with the polishing cylinder.

The effect of adopting above-mentioned technical scheme does, and the pipeline lies in the part of polishing a section of thick bamboo and has the time to be in unsettled state, and the surface of location section of thick bamboo slope can promote to carry out the restoration and the repairment of appearance because unsettled pipeline that appears deformation.

The utility model has the advantages of it is following:

the utility model discloses in the use, after the pipeline outer wall is processed into regular pipe form by the shaping section of thick bamboo, the pipeline gets into the section of thick bamboo that polishes, and the gyro wheel of polishing in the section of thick bamboo that polishes is when rotating around the pipeline, and self also rotating, polishes the pipeline inner wall, can get rid of the unevenness's vestige that appears on the pipeline outer wall in the remolding process, guarantees that the pipeline surface is smooth and level; the gyro wheel of polishing can be followed the groove of polishing and removed, can the outer wall demand of polishing of the pipeline of different diameters of adaptation.

Drawings

Fig. 1 is a schematic view of the overall structure of the present invention;

FIG. 2 is a schematic view of the internal structure of the polishing groove of the present invention;

FIG. 3 is a schematic view of the internal structure of the cleaning device of the present invention;

in the figure: 1-forming cylinder, 2-polishing cylinder, 3-positioning cylinder, 4-polishing roller, 5-mounting rack, 6-screw rod, 7-water cooling system, 8-scraper, 9-spring, 101-annular groove, 102-shaping hole, 201-polishing groove, 202-limiting groove, 701-water storage tank and 801-limiting cover.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the invention, i.e., the described embodiments are only some, but not all embodiments of the invention. While the components of the embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations, it should be understood that the terms "upper," "lower," "front," "rear," "inner," "outer," and the like are used in the description of the invention and are based on the orientations and positional relationships illustrated in the figures and are used for convenience in describing the invention and to simplify the description, but do not indicate or imply that the device or element so referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus should not be considered as limiting the invention.

Thus, the following detailed description of the embodiments of the present invention, presented in the accompanying drawings, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. Based on the embodiment of the present invention, all other embodiments obtained by those skilled in the art without creative efforts belong to the protection scope of the present invention.

It is noted that relational terms such as "first" and "second," and the like, may be 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. Furthermore, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrases "comprising a" \8230; "does not exclude the presence of additional like elements in the process, method, article, or apparatus that comprises the element.

The invention will be further described with reference to the accompanying drawings, but the scope of the invention is not limited to the following description.

As shown in fig. 1-3, a device for forming a large diameter polymer pipe is provided, which is arranged on a forming machine, and is used for forming a pipe, and comprises a forming cylinder 1, a polishing cylinder 2 and a positioning cylinder 3, wherein the forming cylinder 1, the polishing cylinder 2 and the positioning cylinder 3 are all arranged in the forming machine, one end of the forming cylinder 1 is communicated with a feed inlet of the forming machine, annular convex parts are arranged at two ends of the polishing cylinder 2, the annular convex parts at two ends of the polishing cylinder 2 are fittingly sleeved on the forming cylinder 1 and the positioning cylinder 3, the positioning cylinder 3 is fixedly connected with the inner wall of the forming machine through a structural rod, the forming cylinder 1, the polishing cylinder 2 and the positioning cylinder 3 are coaxially arranged and internally communicated, the polishing cylinder 2 rotates under the driving of a motor, a polishing groove 201 is further arranged on the inner wall of the polishing cylinder 2, and a mounting rack 4, 5 and a control mechanism are further arranged in the polishing groove 201, the two ends of the polishing roller 4 are both rotatably provided with the mounting frames 5, a motor for driving the polishing roller 4 to rotate is arranged on the mounting frames 5, the two mounting frames 5 are arranged in a mirror image manner, the mounting frames 5 are movably arranged in the polishing groove 201, the control mechanism is arranged in the polishing groove 201 and is used for driving the mounting frames 5 to move along the polishing groove 201, the polishing roller 4 is in contact with the surface of the pipeline, the pipeline enters the forming cylinder 1 and is adsorbed on the outer wall of the forming cylinder 1, so that the outer wall of the pipeline can be in a regular round tube shape, the pipeline passes through the forming cylinder 1 and enters the polishing cylinder 2, the polishing cylinder 2 continuously rotates under the action of the motor, the polishing roller 4 rotates around the pipeline along with the rotation of the polishing cylinder 2, and the polishing roller 4 also performs self-rotation under the action of the motor to polish the surface of the pipeline, the unevenness trace existing on the surface of the pipeline is ground, the surface of the pipeline can be kept smooth, the quality of the product is guaranteed, the control mechanism is used for driving the mounting frame 5 to move along the grinding groove 201, the grinding roller 4 can change the distance between the grinding roller and the axis of the grinding cylinder 2, the pipeline can be ground to adapt to different sizes, and the universality is stronger.

As a further improvement of the above scheme, mounting bracket 5 is the L shape structural slab, the long limit of mounting bracket 5 with grinding roller 4 rotates and connects, grinding groove 201's both sides limit has still seted up spacing groove 202, two mounting bracket 5 and two spacing groove 202's position corresponds, mounting bracket 5's minor face activity card is established in spacing groove 202, spacing groove 202's length direction with grinding barrel 2's diameter direction is parallel, and mounting bracket 5's long limit rotates with grinding roller 4 to be connected, and long limit and grinding roller 4's being connected lets grinding roller 4 can be whole stretch out from grinding the inslot, increases the pipeline diameter scope that this device can the adaptation be polished, and mounting bracket 5's minor face activity card is established in spacing groove 202, defines mounting bracket 5's activity mode for the removal, restricts mounting bracket 5's activity direction simultaneously, hoisting device's overall stability.

As a further improvement of the above scheme, the control mechanism is a screw rod 6, the screw rod 6 is rotatably disposed in the polishing groove 201, an axis of the screw rod 6 is perpendicular to an axis of the polishing barrel 2, the mounting frame 5 is in threaded connection with the screw rod 6, and the screw rod 6 rotates to operate the mounting frame 5 to move along the axial direction of the screw rod 6, so as to drive the polishing roller 4 to move along the axial direction of the screw rod 6 and adjust the position of the polishing roller 4.

As the further improvement of above-mentioned scheme, still include water cooling system 7, water cooling system 7 includes the raceway and a plurality of water spray nozzles that set up on its surface, water cooling system 7 sets up in the groove 201 of polishing, constitute water cooling system 7's a plurality of nozzles are just right the gyro wheel 4 of polishing, the 2 outsides of polishing section of thick bamboo still are provided with storage water tank 701, water cooling system 7 with storage water tank 701 intercommunication, pipeline stock surface temperature is higher, and the nozzle of constituteing water cooling system 7 can spray water 4 surfaces of polishing the gyro wheel, and the help is polished the gyro wheel 4 and is cooled down, avoids polishing the gyro wheel 4 because the temperature transmission of accepting from the pipeline leads to self overheated damage, and the water on 4 surfaces of gyro wheel of polishing simultaneously also can carry out preliminary cooling and hardening to the pipeline, lets the pipeline be difficult again because of being touched and warp after the surface is polished smoothly.

As the further improvement of above-mentioned scheme, still include cleaning device, cleaning device sets up on 2 inner walls of a polishing section of thick bamboo, cleaning device sets up polish the groove 201 other, cleaning device includes scraper blade 8 and

spring

9, 8 base profiles of scraper blade with polish the laminating of 2 inner wall adaptations of a section of thick bamboo, scraper blade 8 with polish 2 inner wall sliding fit of a section of thick bamboo, spring 9 one end is connected on scraper blade 8, spring 9 promotes scraper blade 8 with polish gyro wheel 4 contact, the incomplete bits that polish from the pipeline can be glued on the gyro wheel 4 surface of polishing in the rotation, scraper blade 8 is promoted by the spring and is polished gyro wheel 4 in close contact with, scraper blade 8 can scrape the incomplete bits on 4 surfaces of the gyro wheel of polishing, avoids these incomplete bits to be stained with again on the pipeline, guarantees the product quality.

As a further improvement of the above scheme, the cleaning device further comprises a limiting cover 801, the limiting cover 801 covers the inner wall of the grinding cylinder 2, a through hole is further formed in one side of the limiting cover 801 close to the grinding roller 4, the scraper 8 is in sliding fit with the through hole of the limiting cover 801, the other end of the spring 9 is connected to the inner wall of the limiting cover 801, the limiting cover 801 pushes the scraper 8 to contact with the inner wall of the grinding cylinder 2, the scraper 8 and the spring 9 are separated from the pipeline by the limiting cover 801, and the limiting cover 801 simultaneously limits the movement and deformation directions of the scraper 8 and the spring 9, so that the connection between the structures is tighter.

As the further improvement of above-mentioned scheme, circumference array has a plurality of ring channels 101 on the 1 inner wall of a shaping section of thick bamboo, be closest to the make-up machine feed inlet in the shaping section of thick bamboo 1 ring channel 101 bottom circumference array has a plurality of shaping holes 102, shaping hole 102 and external vacuum machine's output intercommunication, 1 inner wall of a shaping section of thick bamboo and official way surface contact, the inner wall diameter of a section of thick bamboo 2 of polishing is less than the inner wall diameter of a shaping section of thick bamboo 1, the pipeline outer wall can be adsorbed by the interior pressure of the ring channel 101 that is connected with the vacuum machine, lets the pipeline outer wall hug closely a shaping section of thick bamboo 1 inner wall, carries out preliminary design operation to the pipeline.

As the further improvement of above-mentioned scheme, 3 inner walls of a location section of thick bamboo are hopper-shaped structure, 3 inner wall diameters of a location section of thick bamboo wide one end with a section of thick bamboo 2 of polishing is connected, and the part that the pipeline is located a section of thick bamboo 2 of polishing has the period to be in unsettled state, and the surface of 3 slopes of a location section of thick bamboo can promote because unsettled pipeline that appears deformation carries out the reseing and maintaining of appearance, and whole repair process is progressive, can not leave new vestige on the pipeline surface again.

The present invention is not limited to the details of the embodiments in the above description, and any person skilled in the art can easily modify the technical solution of the present invention without departing from the scope of the technical solution of the present invention, or modify it into equivalent embodiments with equivalent modifications, and these simple modifications all belong to the protection scope of the present invention. It should be noted that the various technical features described in the above embodiments can be combined in any suitable manner without contradiction, and in order to avoid unnecessary repetition, the present invention does not need to describe any combination of the features. In addition, various embodiments of the present invention can be combined arbitrarily, and the disclosed content should be regarded as the present invention as long as it does not violate the idea of the present invention.

Claims

1. The forming device is arranged on a forming machine and used for forming a pipeline, and is characterized by comprising a forming barrel (1), a polishing barrel (2) and a positioning barrel (3), wherein the forming barrel (1), the polishing barrel (2) and the positioning barrel (3) are arranged in the forming machine, one end of the forming barrel (1) is communicated with a feed inlet of the forming machine, annular convex parts are arranged at two ends of the polishing barrel (2), the annular convex parts at two ends of the polishing barrel (2) are sleeved on the forming barrel (1) and the positioning barrel (3) in an adaptive manner, the positioning barrel (3) is fixedly connected with the inner wall of the forming machine through a structural rod, the forming barrel (1), the polishing barrel (2) and the positioning barrel (3) are coaxially arranged and internally communicated, the polishing barrel (2) is driven by a motor to rotate, a polishing groove (201) is formed in the inner wall of the polishing barrel (2), polishing rollers (4), a polishing control mechanism and a mounting rack (5) are arranged at two ends of the polishing roller (5), and a motor driving mechanism is arranged on the mounting rack (201), the control mechanism is arranged in the grinding groove (201), the control mechanism is used for driving the mounting frame (5) to move along the grinding groove (201), and the grinding roller (4) is in contact with the surface of the pipeline.

2. The device for forming the large-diameter high-molecular pipeline according to claim 1, wherein the mounting rack (5) is an L-shaped structural plate, the long side of the mounting rack (5) is rotatably connected with the polishing roller (4), the two side edges of the polishing groove (201) are further provided with limiting grooves (202), the two mounting racks (5) correspond to the two limiting grooves (202), the short sides of the mounting racks (5) are movably clamped in the limiting grooves (202), and the length direction of the limiting grooves (202) is parallel to the diameter direction of the polishing barrel (2).

3. The device for forming the large-diameter high-molecular pipeline according to claim 1, wherein the control mechanism is a screw rod (6), the screw rod (6) is rotatably arranged in the grinding groove (201), the axis of the screw rod (6) is perpendicular to the axis of the grinding cylinder (2), and the mounting frame (5) is in threaded connection with the screw rod (6).

4. The device for forming the large-diameter high-molecular pipeline according to claim 1, further comprising a water cooling system (7), wherein the water cooling system (7) comprises a water pipe and a plurality of water nozzles arranged on the surface of the water pipe, the water cooling system (7) is arranged in the grinding groove (201), the plurality of nozzles forming the water cooling system (7) are opposite to the grinding roller (4), a water storage tank (701) is further arranged outside the grinding cylinder (2), and the water cooling system (7) is communicated with the water storage tank (701).

5. The device for forming the large-diameter high-molecular pipeline according to claim 1, further comprising a cleaning device, wherein the cleaning device is arranged on the inner wall of the grinding cylinder (2), the cleaning device is arranged beside the grinding groove (201), the cleaning device comprises a scraper (8) and a spring (9), the bottom profile of the scraper (8) is matched and attached to the inner wall of the grinding cylinder (2), the scraper (8) is in sliding fit with the inner wall of the grinding cylinder (2), one end of the spring (9) is connected to the scraper (8), and the spring (9) pushes the scraper (8) to contact with the grinding roller (4).

6. The device for forming the large-diameter polymer pipeline according to claim 5, wherein the cleaning device further comprises a limiting cover (801), the limiting cover (801) is covered on the inner wall of the grinding cylinder (2), a through hole is further formed in one side, close to the grinding roller (4), of the limiting cover (801), the scraper (8) is in sliding fit with the through hole of the limiting cover (801), the other end of the spring (9) is connected to the inner wall of the limiting cover (801), and the limiting cover (801) pushes the scraper (8) to contact with the inner wall of the grinding cylinder (2).

7. The forming device for the large-diameter high-molecular pipeline according to claim 1, wherein a plurality of annular grooves (101) are circumferentially arrayed on the inner wall of the forming cylinder (1), a plurality of shaping holes (102) are circumferentially arrayed at the bottom of the annular groove (101) closest to a feeding port of the forming machine in the forming cylinder (1), the shaping holes (102) are communicated with an output end of an external vacuum machine, the inner wall of the forming cylinder (1) is in contact with the surface of a pipeline, and the diameter of the inner wall of the grinding cylinder (2) is smaller than that of the inner wall of the forming cylinder (1).

8. The forming device of the large-diameter high-molecular pipeline according to claim 1, wherein the inner wall of the positioning cylinder (3) is funnel-shaped, and the wide end of the inner wall of the positioning cylinder (3) is connected with the grinding cylinder (2).