CN115352034A

CN115352034A - Plastic pipe bending equipment

Info

Publication number: CN115352034A
Application number: CN202211040164.8A
Authority: CN
Inventors: 林真源; 刘璐
Original assignee: Fujian Hengjie Plastic Industry New Material Co Ltd
Current assignee: Fujian Hengjie Plastic Industry New Material Co Ltd
Priority date: 2022-08-29
Filing date: 2022-08-29
Publication date: 2022-11-18

Abstract

The invention relates to the technical field of pipe fitting machining, and discloses a plastic pipe bending machining device which comprises a bottom plate, wherein a machining mechanism is arranged at the top of the bottom plate, and the machining mechanism comprises a sliding groove. According to the plastic pipe bending processing equipment, the threaded rotating shaft A is rotated to enable the two sliding columns to relatively slide in the sliding grooves, the two arc-shaped clamping plates are relatively moved through the connecting rod to clamp one end of a plastic pipe, the threaded rotating shaft A is rotated to drive the driving wheel to rotate, and the threaded rotating shaft B is rotated through the driven wheel and the belt to drive the other two arc-shaped clamping plates to relatively move to clamp the other end of the plastic pipe, so that the two ends of the plastic pipe are fixed, and the plastic pipe is prevented from shaking to affect the bending effect when bent; carry and draw the kelly, make the kelly break away from the fixture block, stimulate arc pinch-off blades this moment and make the fixture block break away from the connecting rod to dismantle arc pinch-off blades, otherwise the installation makes arc pinch-off blades be equipped with dismantlement and change function, thereby improve equipment's adaptation degree.

Description

Plastic pipe bending equipment

Technical Field

The invention relates to the technical field of pipe fitting processing, in particular to a plastic pipe bending processing device.

Background

The plastic pipe is made by using synthetic resin, namely polyester as raw material, adding stabilizer, lubricant, plasticizer and the like, and extruding the raw material in a pipe making machine by a plastic method, and is mainly used as a tap water supply system pipe, a drainage, exhaust and pollution discharge sanitary pipe, an underground drainage pipe system, a rainwater pipe, a threading pipe for electric wire installation and assembly and the like of a house building; in the production process of the plastic pipe, the plastic pipe needs to be subjected to local bending treatment, so that the plastic pipe is suitable for the actual use environment;

the existing plastic pipe bending mode adopts a mechanical or manual pulling mode, but the existing mechanical equipment cannot bend pipelines with different diameters, so that the adaptability of single mechanical equipment is low, and different equipment is required to be used during bending processing, thereby increasing the production cost; mechanical equipment cannot fix the plastic pipe, and the two ends of the plastic pipe need to be manually compacted during bending, so that the pipeline shakes during bending, and the bending effect is influenced; the bending angle of the plastic pipe is difficult to be accurate due to the manual pulling mode, time and labor are wasted, and labor cost is increased.

Disclosure of Invention

The technical problem to be solved by the invention is as follows: the equipment adaptation degree is low, can't fix plastic tubing, plastic tubing bending angle adjusts when crooked.

In order to solve the technical problems, the invention adopts the technical scheme that: the plastic pipe bending processing equipment comprises a bottom plate, wherein a processing mechanism is arranged at the top of the bottom plate and comprises a sliding chute;

the sliding groove is formed in the top of the bottom plate, a sliding column is connected to the inner surface of the sliding groove in a sliding mode, a threaded rotating shaft A is connected to the inner wall of the sliding column in a threaded mode, a rotating groove is formed in the inner surface of the sliding groove, the inner surface of the rotating groove is rotatably connected with one end of the threaded rotating shaft A through a bearing, a transmission groove is formed in the inner surface of the rotating groove, a driving wheel is fixedly mounted on the surface of the threaded rotating shaft A, the driving wheel is connected with a driven wheel through a belt in a transmission mode, and a threaded rotating shaft B is fixedly mounted on the inner wall of the driven wheel;

the connecting rod is fixedly installed at the top of the sliding column, a clamping groove is formed in one side of the connecting rod, a clamping block is clamped on the inner surface of the clamping groove, an arc-shaped clamping plate is fixedly installed on one side of the clamping block, a clamping rod is connected to the inner wall of the clamping block in a sliding mode, a through groove is formed in the top of the connecting rod in a penetrating mode, the inner surface of the through groove is connected with the surface of the clamping rod in a sliding mode, a spring is sleeved on the surface of the clamping rod, one end of the spring is fixedly connected with the surface of the clamping rod, and the other end of the spring is fixedly connected with the top of the connecting rod;

and a bending mechanism is arranged at the top of the bottom plate.

Further, bottom plate bottom fixed mounting has the supporting leg, and four supporting legs of bottom plate bottom are the array and distribute to support the bottom plate and above structure.

Further, the mechanism of buckling includes the motor that just reverses, just reverse motor bottom and bottom plate top fixed connection, just reverse motor output fixed mounting has the pivot, pivot top fixed mounting has the bull stick, the bull stick top articulates there is the connecting rod, the connecting rod top articulates there is the horizontal pole, horizontal pole one end fixed mounting has the stick of buckling, horizontal pole surface sliding connection has the stand, stand bottom and bottom plate top fixed connection open the motor that reverses, just reverses motor output and drives the pivot and rotate to drive the bull stick and rotate, make the horizontal pole horizontal slip in the stand through the connecting rod, and do not produce when making the horizontal pole slide because of the spacing of stand and rock, thereby drive when buckling stick horizontal slip with plastic tubing surface contact, and promote the plastic tubing, thereby make the plastic tubing middle part receive the stick extrusion of buckling and be crooked, crooked to suitable angle, close the motor that reverses, make the crooked angle of plastic tubing by accurate control, improved crooked quality, and practiced thrift the cost of labor.

Furthermore, the shape of the horizontal cross section of each sliding column is matched with the shape of the horizontal cross section of the inner surface of the sliding groove, the sliding columns are arranged in two groups, each group is two, the two groups of sliding columns are distributed on the surfaces of the threaded rotating shaft A and the threaded rotating shaft B, and the two sliding columns in each group are symmetrically distributed in the sliding grooves, so that the sliding columns do not shake when sliding in the sliding grooves, and the sliding of the sliding columns is more stable.

Further, screw thread pivot A is two-way threaded rod, and screw thread pivot A surface is forward screw thread with a traveller inner wall contact site, be reverse screw thread with another traveller inner wall contact site, and screw thread pivot A is smooth surface with traveller contactless site, when making threaded rod A rotate, two traveller reverse slip, thereby make two travelers be close to or keep away from, thereby drive two arc clamp plates and be close to or keep away from, thereby make two arc clamp plates press from both sides tight plastic tubing, thereby avoid the bending process in the plastic tubing production displacement influence crooked effect.

Furthermore, the thread rotating shaft B and the thread rotating shaft A are symmetrically distributed inside the bottom plate, and the thread shapes, the lengths and the sizes of the thread rotating shaft B and the thread rotating shaft A are the same, so that the rotating amplitude and the rotating shape of the thread rotating shaft B and the thread rotating shaft A are equal, and the thread rotating shaft B and the arc-shaped clamping plate at the top of the thread rotating shaft A simultaneously clamp two ends of the plastic pipeline.

Furthermore, the notch height of transmission groove is greater than the external diameter of action wheel, and transmission inslot surface and belt surface contactless avoid thereby belt surface and transmission inslot surface to take place the friction and make the belt produce wearing and tearing, have increased the life of belt.

Further, the arc clamping plates are provided with two groups, each group is provided with two groups, the two groups of arc clamping plates are respectively positioned at the top of the thread rotating shaft A and the top of the thread rotating shaft B, and the two arc clamping plates in each group are symmetrically distributed at the top of the sliding groove, so that the two groups of arc clamping plates simultaneously clamp the two ends of the plastic pipe, and the middle part of the plastic pipe is convenient to bend.

Further, fixture block horizontal cross sectional shape and draw-in groove internal surface horizontal cross sectional shape looks adaptation, and fixture block inner wall horizontal cross sectional shape and kelly horizontal cross sectional shape and logical inslot surface horizontal cross sectional shape looks adaptation make the fixture block card in the draw-in groove more firm and do not produce and rock, and the fixture block does not produce when the kelly card advances fixture block inner wall and leads to the inslot and rocks, makes fixture block and connecting rod be connected through the kelly to installation arc pinch-off blades.

Furthermore, the vertical cross-sectional shape of stand inner wall side is the rectangle, and the vertical cross-sectional shape of stand inner wall side and the vertical cross-sectional shape looks adaptation of horizontal pole side, makes the horizontal pole not produce when the stand inner wall slides and rocks, and the square inner wall cross-section of stand is spacing to the horizontal pole, produces the rotation when avoiding the horizontal pole to slide.

The invention has the beneficial effects that:

(1) This plastic tubing bending equipment rotates screw thread pivot A, make two travelers relative slip in the spout, thereby it presss from both sides tight plastic tubing one end to make two arc pinch-off blades relative motion through the connecting rod, thereby screw thread pivot A rotates and drives the action wheel and rotate, make screw thread pivot B rotate through following driving wheel and belt, thereby it presss from both sides the tight plastic tubing other end to drive two other arc pinch-off blades relative motion, thereby fixed plastic tubing both ends, produce when avoiding the plastic tubing bending and rock the crooked effect of influence.

(2) This plastic tubing bending process equipment carries the draw-bar, makes the draw-bar break away from the fixture block, and pulling arc pinch-off blades makes the fixture block break away from the connecting rod this moment to dismantle arc pinch-off blades, otherwise the installation makes arc pinch-off blades be equipped with dismantlement and change the function, makes equipment change the arc pinch-off blades of different specifications according to the diameter of crooked plastic tubing, thereby improve equipment's adaptation degree, reduce equipment quantity, reduction in production cost.

Drawings

FIG. 1 is a schematic front view of the novel structure of the present invention;

FIG. 2 is a schematic front cross-sectional view of the present invention;

FIG. 3 is an enlarged schematic view of the invention at A;

FIG. 4 is a schematic plan view of the present invention;

FIG. 5 is a schematic plan sectional view of the base plate of the present invention;

FIG. 6 is a left side schematic view of the inventive belt.

Description of reference numerals:

1, 2 support legs, 3 bending mechanisms, 301 forward and reverse rotating motors, 302 rotating shafts, 303 rotating rods, 304 connecting rods, 305 cross rods, 306 bending rods, 307 upright columns, 4 processing mechanisms, 401 sliding grooves, 402 sliding columns, 403 threaded rotating shafts A, 404 rotating grooves, 405 driving wheels, 406 driven wheels, 407 belts, 408 threaded rotating shafts B, 409 connecting rods, 410 clamping grooves, 411 clamping blocks, 412 arc-shaped clamping plates, 413 clamping rods, 414 through grooves and 415 springs.

Detailed Description

In order to explain technical contents, achieved objects, and effects of the present invention in detail, the following description is made with reference to the accompanying drawings in combination with the embodiments.

The most key concept of the invention is as follows: set up processing agency 4 and make the plastic tubing both ends fixed by arc clamping plate 412, do not produce when making the plastic tubing crooked and rock, and arc clamping plate 412 possesses dismantlement and change effect, makes the curved plastic tubing diameter of equipment as required change the arc clamping plate of looks adaptation to it is higher to make equipment adaptation degree.

Referring to fig. 1 to 6, a plastic pipe bending apparatus includes a bottom plate 1, a processing mechanism 4 is disposed on the top of the bottom plate 1, and the processing mechanism 4 includes a chute 401;

the sliding chute 401 is arranged at the top of the bottom plate 1, the inner surface of the sliding chute 401 is connected with a sliding column 402 in a sliding manner, the inner wall of the sliding column 402 is connected with a threaded rotating shaft A403 in a threaded manner, the inner surface of the sliding chute 401 is provided with a rotating groove 404, the inner surface of the rotating groove 404 is rotatably connected with one end of the threaded rotating shaft A403 through a bearing, the inner surface of the rotating groove 404 is provided with a transmission groove 416, the surface of the threaded rotating shaft A403 is fixedly provided with a driving wheel 405, the driving wheel 405 is in transmission connection with a driven wheel 406 through a belt 407, and the inner wall of the driven wheel 406 is fixedly provided with a threaded rotating shaft B408;

a connecting rod 409 is fixedly mounted at the top of the sliding column 402, a clamping groove 410 is formed in one side of the connecting rod 409, a clamping block 411 is clamped on the inner surface of the clamping groove 410, an arc-shaped clamping plate 412 is fixedly mounted on one side of the clamping block 411, a clamping rod 413 is connected to the inner wall of the clamping block 411 in a sliding mode, a through groove 414 is formed in the top of the connecting rod 409 in a penetrating mode, the inner surface of the through groove 414 is connected with the surface of the clamping rod 413 in a sliding mode, a spring 415 is sleeved on the surface of the clamping rod 413, one end of the spring 415 is fixedly connected with the surface of the clamping rod 413, and the other end of the spring 415 is fixedly connected with the top of the connecting rod 409;

the top of the bottom plate 1 is provided with a bending mechanism 3;

from the above description, the beneficial effects of the present invention are: the thread rotating shaft A403 is rotated to enable the two sliding columns 402 to relatively slide in the sliding grooves 401, the two arc-shaped clamping plates 412 are relatively moved through the connecting rod 409 to clamp one end of the plastic pipe, the thread rotating shaft A403 rotates to drive the driving wheel 405 to rotate, and the thread rotating shaft B408 is rotated through the driven wheel 406 and the belt 407 to drive the other two arc-shaped clamping plates 412 to relatively move to clamp the other end of the plastic pipe, so that the two ends of the plastic pipe are fixed, and the plastic pipe is prevented from shaking to affect the bending effect when bent; carry pull kelly 413, make kelly 413 break away from fixture block 411, pulling arc clamping plate 412 this moment makes fixture block 411 break away from connecting rod 409 to dismantle arc clamping plate 412, otherwise the installation makes arc clamping plate 412 possess dismantlement and change the function, makes equipment change the arc clamping plate 412 of different specifications according to the diameter of crooked plastic tubing, thereby improve equipment's adaptation degree, reduce equipment quantity, reduction in production cost.

Furthermore, the bottom of the bottom plate 1 is fixedly provided with a supporting leg 2.

As can be seen from the above description, the beneficial effects of the present invention are: four supporting legs 2 at the bottom of the bottom plate 1 are distributed in an array mode, and therefore the bottom plate 1 and the structures above are supported.

Further, the bending mechanism 3 comprises a forward and reverse rotating motor 301, the bottom of the forward and reverse rotating motor 301 is fixedly connected with the top of the bottom plate 1, a rotating shaft 302 is fixedly mounted at the output end of the forward and reverse rotating motor 301, a rotating rod 303 is fixedly mounted at the top of the rotating shaft 302, a connecting rod 304 is hinged to the top of the rotating rod 303, a cross rod 305 is hinged to the top of the connecting rod 304, a bending rod 306 is fixedly mounted at one end of the cross rod 305, a stand column 307 is slidably connected to the surface of the cross rod 305, and the bottom of the stand column 307 is fixedly connected with the top of the bottom plate 1.

From the above description, the beneficial effects of the present invention are: the positive and negative rotation motor 301 is started, the output end of the positive and negative rotation motor 301 drives the rotating shaft 302 to rotate, so that the rotating rod 303 is driven to rotate, the cross rod 305 can horizontally slide in the upright column 307 through the connecting rod 304, the cross rod 305 does not shake when sliding due to the limitation of the upright column 307, the bending rod 306 is driven to horizontally slide and contact with the surface of the plastic pipe, the plastic pipe is pushed, the middle of the plastic pipe is extruded by the bending rod 306 to be bent, the plastic pipe is bent to a proper angle, the positive and negative rotation motor 301 is closed, the bending angle of the plastic pipe is accurately controlled, the bending quality is improved, and the labor cost is saved.

Further, the horizontal cross-sectional shape of the sliding posts 402 is matched with the horizontal cross-sectional shape of the inner surface of the sliding groove 401, and two groups of sliding posts 402 are arranged, each group is two, the two groups of sliding posts 402 are distributed on the surfaces of the threaded rotating shaft a403 and the threaded rotating shaft B408, and the two sliding posts 402 in each group are symmetrically distributed in the sliding groove 401.

From the above description, the beneficial effects of the present invention are: the sliding column 402 does not shake when sliding in the sliding groove 401, and the sliding of the sliding column 402 is more stable.

Further, the threaded rotating shaft a403 is a two-way threaded rod, a contact portion of the surface of the threaded rotating shaft a403 with the inner wall of one sliding column 402 is a forward thread, a contact portion with the inner wall of the other sliding column 402 is a reverse thread, and a non-contact portion of the threaded rotating shaft a403 with the sliding column 402 is a smooth surface.

From the above description, the beneficial effects of the present invention are: when making threaded rod A403 rotate, two travelers 402 reverse slip to make two travelers 402 be close to or keep away from, thereby drive two arc clamp plate 412 and be close to or keep away from, thereby make two arc clamp plate 412 press from both sides tight plastic tubing, thereby avoid crooked in-process plastic tubing to produce the displacement and influence crooked effect.

Further, the threaded rotating shaft B408 and the threaded rotating shaft a403 are symmetrically distributed inside the bottom plate 1, and the threaded shapes, lengths and sizes of the threaded rotating shaft B408 and the threaded rotating shaft a403 are the same.

From the above description, the beneficial effects of the present invention are: the rotating amplitudes and forms of the threaded rotating shaft B408 and the threaded rotating shaft A403 are equal, so that the threaded rotating shaft B408 and the arc-shaped clamping plate 412 at the top of the threaded rotating shaft A403 simultaneously clamp two ends of the plastic pipeline.

Further, the height of the notch of the transmission groove 416 is larger than the outer diameter of the driver 405, and the inner surface of the transmission groove 416 is not in contact with the surface of the belt 407.

From the above description, the beneficial effects of the present invention are: the abrasion of the belt 407 caused by the friction between the surface of the belt 407 and the inner surface of the transmission groove 416 is avoided, and the service life of the belt 407 is prolonged.

Further, two sets of arc-shaped clamping plates 412 are provided, two for each set, and the two sets of arc-shaped clamping plates 412 are respectively located at the top of the threaded rotating shaft a403 and the top of the threaded rotating shaft B408, and the two arc-shaped clamping plates 412 in each set are symmetrically distributed at the top of the sliding chute 401.

From the above description, the beneficial effects of the present invention are: so that the two groups of arc-shaped clamping plates 412 simultaneously clamp the two ends of the plastic pipe, thereby facilitating the bending of the middle part of the plastic pipe.

Further, the horizontal cross-sectional shape of the fixture block 411 is matched with the horizontal cross-sectional shape of the inner surface of the fixture groove 410, and the horizontal cross-sectional shape of the inner wall of the fixture block 411 is matched with the horizontal cross-sectional shape of the clamping rod 413 and the horizontal cross-sectional shape of the inner surface of the through groove 414.

From the above description, the beneficial effects of the present invention are: so that the fixture block 411 is more stably clamped in the clamping groove 410 without shaking, and the fixture block does not shake when the clamping rod 413 is clamped into the inner wall of the fixture block 411 and the through groove 414, so that the fixture block 411 is connected with the connecting rod 409 through the clamping rod 413, thereby installing the arc-shaped clamping plate 412.

Further, the vertical cross-sectional shape of the inner wall side of the upright 307 is rectangular, and the vertical cross-sectional shape of the inner wall side of the upright 307 is matched with the vertical cross-sectional shape of the side of the cross bar 305.

From the above description, the beneficial effects of the present invention are: the cross bar 305 does not shake when the inner wall of the upright column 307 slides, and the cross section of the square inner wall of the upright column 307 is limited to the cross bar 305, so that the cross bar 305 is prevented from rotating when sliding.

In summary, according to the plastic pipe bending apparatus provided by the present invention, the threaded rotating shaft a403 is rotated to enable the two sliding posts 402 to relatively slide in the sliding groove 401, the two arc-shaped clamping plates 412 are relatively moved through the connecting rod 409 to clamp one end of the plastic pipe, the threaded rotating shaft a403 is rotated to drive the driving wheel 405 to rotate, the driven wheel 406 and the belt 407 are used to drive the threaded rotating shaft B408 to rotate, so as to drive the other two arc-shaped clamping plates 412 to relatively move to clamp the other end of the plastic pipe, thereby fixing the two ends of the plastic pipe, and avoiding the plastic pipe from shaking during bending to affect the bending effect; the clamping rod 413 is pulled, so that the clamping rod 413 is separated from the clamping block 411, the arc-shaped clamping plate 412 is pulled at the moment, the clamping block 411 is separated from the connecting rod 409, the arc-shaped clamping plate 412 is disassembled, otherwise, the arc-shaped clamping plate 412 has the disassembling and replacing functions, the equipment is enabled to replace the arc-shaped clamping plate 412 with different specifications according to the diameter of the bent plastic pipe, the adaptability of the equipment is improved, the number of the equipment is reduced, and the production cost is reduced; the positive and negative rotation motor 301 is started, the output end of the positive and negative rotation motor 301 drives the rotating shaft 302 to rotate, so that the rotating rod 303 is driven to rotate, the cross rod 305 can horizontally slide in the upright column 307 through the connecting rod 304, the cross rod 305 does not shake when sliding due to the limitation of the upright column 307, the bending rod 306 is driven to horizontally slide and contact with the surface of the plastic pipe, the plastic pipe is pushed, the middle of the plastic pipe is extruded by the bending rod 306 to be bent, the plastic pipe is bent to a proper angle, the positive and negative rotation motor 301 is closed, the bending angle of the plastic pipe is accurately controlled, the bending quality is improved, and the labor cost is saved.

The above description is only an embodiment of the present invention, and not intended to limit the scope of the present invention, and all equivalent changes made by using the contents of the present specification and the drawings, or applied directly or indirectly to the related technical fields, are included in the scope of the present invention.

Claims

1. A plastic tubing bending process equipment, includes bottom plate (1), its characterized in that: the top of the bottom plate (1) is provided with a processing mechanism (4), and the processing mechanism (4) comprises a sliding groove (401);

the sliding chute (401) is arranged at the top of the bottom plate (1), a sliding column (402) is connected to the inner surface of the sliding chute (401) in a sliding mode, a threaded rotating shaft A (403) is connected to the inner wall of the sliding column (402) in a threaded mode, a rotating groove (404) is formed in the inner surface of the sliding chute (401), the inner surface of the rotating groove (404) is rotatably connected with one end of the threaded rotating shaft A (403) through a bearing, a transmission groove (416) is formed in the inner surface of the rotating groove (404), a driving wheel (405) is fixedly arranged on the surface of the threaded rotating shaft A (403), the driving wheel (405) is in transmission connection with a driven wheel (406) through a belt (407), and a threaded rotating shaft B (408) is fixedly arranged on the inner wall of the driven wheel (406);

a connecting rod (409) is fixedly mounted at the top of the sliding column (402), a clamping groove (410) is formed in one side of the connecting rod (409), a clamping block (411) is clamped on the inner surface of the clamping groove (410), an arc-shaped clamping plate (412) is fixedly mounted on one side of the clamping block (411), a clamping rod (413) is connected to the inner wall of the clamping block (411) in a sliding mode, a through groove (414) penetrates through the top of the connecting rod (409), the inner surface of the through groove (414) is connected with the surface of the clamping rod (413) in a sliding mode, a spring (415) is sleeved on the surface of the clamping rod (413), one end of the spring (415) is fixedly connected with the surface of the clamping rod (413), and the other end of the spring (415) is fixedly connected with the top of the connecting rod (409);

the top of the bottom plate (1) is provided with a bending mechanism (3).

2. A plastic pipe bending apparatus according to claim 1, wherein: the bottom of the bottom plate (1) is fixedly provided with supporting legs (2).

3. A plastic pipe bending apparatus according to claim 1, wherein: mechanism (3) buckle including just reversing motor (301), just reversing motor (301) bottom and bottom plate (1) top fixed connection, just reversing motor (301) output fixed mounting has pivot (302), pivot (302) top fixed mounting has bull stick (303), bull stick (303) top articulates there is connecting rod (304), connecting rod (304) top articulates there is horizontal pole (305), horizontal pole (305) one end fixed mounting has stick (306) of buckling, horizontal pole (305) surface sliding connection has stand (307), stand (307) bottom and bottom plate (1) top fixed connection.

4. A plastic pipe bending apparatus according to claim 1, wherein: the horizontal cross-sectional shape of the sliding columns (402) is matched with the horizontal cross-sectional shape of the inner surface of the sliding groove (401), two groups of sliding columns (402) are arranged, each group is two, the two groups of sliding columns (402) are distributed on the surfaces of the threaded rotating shaft A (403) and the threaded rotating shaft B (408), and the two sliding columns (402) in each group are symmetrically distributed in the sliding groove (401).

5. A plastic pipe bending apparatus according to claim 1, wherein: the thread rotating shaft A (403) is a bidirectional threaded rod, the contact part of the surface of the thread rotating shaft A (403) and the inner wall of one sliding column (402) is a forward thread, the contact part of the surface of the thread rotating shaft A (403) and the inner wall of the other sliding column (402) is a reverse thread, and the non-contact part of the thread rotating shaft A (403) and the sliding column (402) is a smooth surface.

6. A plastic pipe bending apparatus according to claim 1, wherein: the thread rotating shaft B (408) and the thread rotating shaft A (403) are symmetrically distributed in the bottom plate (1), and the thread shapes, the lengths and the sizes of the thread rotating shaft B (408) and the thread rotating shaft A (403) are the same.

7. A plastic pipe bending apparatus according to claim 1, wherein: the notch height of the transmission groove (416) is larger than the outer diameter of the driving wheel (405), and the inner surface of the transmission groove (416) is not in contact with the surface of the belt (407).

8. A plastic pipe bending apparatus according to claim 1, wherein: the two groups of arc-shaped clamping plates (412) are arranged, each group comprises two arc-shaped clamping plates, the two groups of arc-shaped clamping plates (412) are respectively positioned at the top of the threaded rotating shaft A (403) and the top of the threaded rotating shaft B (408), and the two arc-shaped clamping plates (412) in each group are symmetrically distributed at the top of the sliding groove (401).

9. A plastic pipe bending apparatus according to claim 1, wherein: the horizontal section shape of the fixture block (411) is matched with the horizontal section shape of the inner surface of the clamping groove (410), and the horizontal section shape of the inner wall of the fixture block (411) is matched with the horizontal section shape of the clamping rod (413) and the horizontal section shape of the inner surface of the through groove (414).

10. A plastic pipe bending apparatus according to claim 3, wherein: the vertical cross section of the side surface of the inner wall of the upright column (307) is rectangular, and the vertical cross section of the side surface of the inner wall of the upright column (307) is matched with the vertical cross section of the side surface of the cross rod (305).