Molecularly oriented plastic pipe forming apparatus

Abstract

The utility model discloses a molecular directional plastic pipe forming device, including dynamic end mechanism, static end mechanism and the mould cylinder of connecting between dynamic end mechanism and static end mechanism, wherein static end mechanism is fixed with the core rod, and this core rod is located in the mould cylinder, and this static end mechanism is equipped with static end connecting piece, slewing connecting piece, carousel and compression column, and this static end connecting piece is fixed in the core rod, and the carousel is connected with static end connecting piece through slewing connecting piece, and the carousel is equipped with the sliding slot, and the sliding slot has A end and B end, and the distance from A end to the core rod axis is greater than the distance from B end to the core rod axis, and the static end connecting piece is equipped with the through -hole that distributes along the radial of core rod, and the compression column inserts the through -hole, and one end of compression column is connected with the sliding slot slidingly, and the other end can be close to or away from the core rod, and the static end connecting piece is equipped with the drive piece of drive carousel slewing.

Description

Technical Field

[0001] This utility model belongs to the field of plastic tube molding technology, specifically relating to a molecularly oriented plastic tube molding device. Background Technology

[0002] Molecularly oriented plastic tube technology mainly involves heating the plastic tube to a highly elastic state, and then applying pressure or tension to cause plastic deformation along the direction of force. This causes the molecular chains to stretch from their original contracted state to a horizontal or vertical alignment, and then rapidly decrease to a glassy, ​​fixed state. As a result, the strength, toughness, impact resistance, and fatigue resistance of the plastic tube are significantly improved, achieving the goal of saving materials.

[0003] The molding equipment for molecularly oriented plastic tubes mainly includes a mold cylinder, a moving end mechanism, and a stationary end mechanism. The stationary end mechanism is connected to a mandrel and located inside the mold cylinder. During the molding process, the tube blank is fitted onto the mandrel. The mold cylinder has several support structures, and the moving end mechanism and the stationary end mechanism are used to fix and seal the tube blank.

[0004] The stationary end mechanism is generally equipped with a stationary end locking device for fixing the tube blank. For example, the existing utility model patent with publication number CN216182681U and patent name "Plastic Pipe Blow Molding Locking and Sealing Device" uses a special-shaped steel ball with a return spring set on the mold cylinder. The special-shaped steel ball is also called a pressure ball. The special-shaped steel ball is pressed or moved away from the tube blank radially by the clamping push cylinder driven by the hydraulic cylinder. When the hydraulic cylinder extends and pushes the clamping push cylinder forward, the clamping push cylinder drives the special-shaped steel ball to press the tube blank. When the hydraulic cylinder retracts and pushes the clamping push cylinder backward, the clamping push cylinder moves away from the special-shaped steel ball, and the special-shaped steel ball moves away from the tube blank under the drive of the return spring.

[0005] However, under the action of high-pressure airflow, the tube blank will expand radially and axially according to the shape of the mold. Radial expansion will not affect the return of the clamping ball, but axial expansion will stretch the tube blank from both ends to the middle section along the axis. Therefore, a tensile force along the axial direction of the tube blank will be generated on the clamping ball. As a result, the clamping ball will tilt along the axial direction of the tube blank when it moves radially. That is, the clamping ball will have an angle in its track. When the hydraulic cylinder retracts and pushes the clamping cylinder backward, the return spring cannot overcome the radial force to achieve rebound, and the clamping ball cannot return to its normal position. Summary of the Invention

[0006] To address the aforementioned problems, this invention provides a molecularly oriented plastic tube forming device that can solve the problem of the stationary end locking device failing to reset properly.

[0007] The embodiments of this utility model are achieved through the following technical solutions: A molecularly oriented plastic tube forming apparatus includes a moving end mechanism, a stationary end mechanism, and a mold cylinder connecting the moving end mechanism and the stationary end mechanism. The stationary end mechanism has a mandrel fixed within the mold cylinder. The stationary end mechanism includes a stationary end connector, a rotary connector, a turntable, and a clamping column. The stationary end connector is fixed to the mandrel. The turntable is connected to the stationary end connector via the rotary connector. The turntable has a groove with ends A and B. The distance from end A to the mandrel axis is greater than the distance from end B to the mandrel axis. The distance between the axes is such that the stationary end connector has through holes distributed radially along the mandrel. The clamping pin is inserted into the through holes, and one end of the clamping pin is slidably connected to the slide groove, while the other end can be close to or away from the mandrel. The stationary end connector is also provided with a driving member for driving the turntable to rotate. When the driving member drives the turntable to rotate in the first preset direction, the clamping pin slides to end A of the slide groove and moves away from the mandrel. When the driving member drives the turntable to rotate in the second preset direction, the clamping pin slides to end B of the slide groove and moves closer to the mandrel.

[0008] In one embodiment of this utility model, the clamping column is provided with a roller connected to the slide groove.

[0009] In one embodiment of this utility model, the clamping column is provided with a rotating shaft, and the rotating shaft is provided with a bearing that is tactilely connected to the sliding groove.

[0010] In one embodiment of this utility model, the groove is an arc groove or a straight groove.

[0011] In one embodiment of this utility model, the slewing connector is a slewing bearing.

[0012] In one embodiment of the present invention, the stationary end mechanism further includes a mandrel fixing seat and a base. The base is provided with a hinge support point. The mandrel fixing seat is hinged to the hinge support point via a pin. An adjustment and locking structure is also provided between the mandrel fixing seat and the base. The adjustment and locking structure can drive the mandrel fixing seat to rotate around the pin.

[0013] In one embodiment of the present invention, the adjusting locking structure includes a connecting block and an adjusting bolt. The connecting block is hinged to the mandrel fixing seat, and the connecting block is connected to the base through the adjusting bolt.

[0014] In one embodiment of this utility model, the moving end mechanism includes: a moving end locking cylinder, a sealing cylinder, a connecting plate, and a connecting cylinder. One end of the sealing cylinder is connected to the connecting cylinder, and the other end of the sealing cylinder is connected to the connecting plate. The moving end locking cylinder is connected to the connecting plate. The connecting plate is hinged with locking pins in a circular array along the axial direction of the connecting cylinder. The locking pins extend into the interior of the connecting cylinder. The piston rod of the moving end locking cylinder extends into the connecting cylinder, and a wedge block is provided at the end of the piston rod of the moving end locking cylinder. The wedge block cooperates with the locking pin to control the opening or closing of the locking pin. The piston end of the sealing cylinder is provided with a tube blank sealing ring, and the sealing cylinder can drive the tube blank sealing ring to abut against the tube blank.

[0015] The technical solution of this utility model has at least the following advantages and beneficial effects: This invention, by adding a rotary connector and a turntable with a groove at the stationary end, transforms the rotational motion of the turntable into the linear motion of the pressure column at the output end. Both motion directions are driven by the active force, overcoming the difficulty of the original technology where the pressure ball is stuck and cannot return to its original position due to the axial displacement of the pressure ball along the tube blank caused by the expansion and deformation of the tube wall. Attached Figure Description

[0016] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this utility model and should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 This is a schematic diagram of the appearance of the present utility model; Figure 2 This is a schematic diagram of the internal structure of the present invention; Figure 3 for Figure 1 The right view; Figure 4 This is a schematic diagram of the stationary end mechanism in this utility model; Figure 5 for Figure 4 A magnified view of part C in the middle; Figure 6 This is a schematic diagram of the clamping column in this utility model; Figure 7 This is a schematic diagram of the moving end mechanism in this utility model; Figure 8 This is a schematic diagram of the moving end locking cylinder, connecting plate, wedge block and locking pin in the moving end mechanism.

[0018] Icons: 1-Moving end mechanism, 11-Moving end locking cylinder, 12-Sealing cylinder, 13-Connecting plate, 14-Connecting cylinder, 15-Wedge block, 16-Locking pin, 17-Blank sealing ring, 2-Stationary end mechanism, 22-Mandrel fixing seat, 23-Base, 231-Hinge support point, 24-Adjusting locking structure, 241-Connecting block, 242-Adjusting bolt, 25-Stationary end connector, 26-Rotary connector, 27-Turntable, 271-Slide groove, 28-Pressure column, 3-Mold cylinder, 4-Mandrel. Detailed Implementation

[0019] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. The components of the embodiments of this utility model described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0020] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0021] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0022] In the description of this utility model, it should be noted that if terms such as "inner" or "outer" are used to indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship in which the utility model product is usually placed during use, they are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0023] In the description of this utility model, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "install," "configure," and "connect" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances. Example

[0024] Please refer to Figure 1 This embodiment provides a molecularly oriented plastic tube forming device, including a moving end mechanism 1, a stationary end mechanism 2, and a mold cylinder 3 connected between the moving end mechanism 1 and the stationary end mechanism 2. The mold cylinder 3 is placed on the ground or at a predetermined position by multiple support seats. The internal space of the moving end mechanism 1, the internal space of the stationary end mechanism 2, and the mold cylinder 3 together constitute a mold cavity for forming plastic tubes. The inlet of the mold cavity is located in the moving end mechanism 1. During the molecularly oriented plastic tube forming, the tube blank (not shown in the figure) first enters the mold cavity from the moving end mechanism 1, then the moving end mechanism 1 is closed to seal the mold cavity, and then air blowing and expansion are performed.

[0025] Please refer to Figure 1 , 2 In this embodiment, the stationary end mechanism 2 includes a mandrel 4, a mandrel fixing seat 22, and a base 23. The mandrel 4 is located inside the mold cylinder 3 and one end is fixed to the mandrel fixing seat 22; in other words, the mandrel 4 is a cantilever beam structure. The base 23 is provided with a hinge support point 231. The mandrel fixing seat 22 is hinged to the hinge support point 231 via a pin. Furthermore, an adjustment and locking structure 24 is provided between the mandrel fixing seat 22 and the base 23. By adjusting the structure, the mandrel fixing seat 22 can be driven to rotate around the pin. That is, according to the lever principle, the mandrel 4 and the mandrel fixing seat 22 together form a lever. The pin that hinges the mandrel fixing seat 22 to the hinge support point 231 is the fulcrum. The adjustment and locking structure 24 acts on the right side of the fulcrum, and the mandrel 4 is located on the left side of the fulcrum. By adjusting the locking structure 24, the attitude of the lever is adjusted to adjust the position of the suspended end of the mandrel 4. In existing technology, the mandrel 4 is a cantilever beam structure, approximately 6 meters long. Once one end of the mandrel 4 is fixed, with only one fulcrum, the end of the mandrel 4 inevitably sags, causing the center of the mandrel 4's end axis to become concentric with the mold cavity inlet, preventing the billet from entering the mold cavity. This embodiment uses an adjustment and locking structure 24 to adjust the posture of the mandrel 4, ensuring that the center of the mandrel 4's end axis is concentric with the mold cavity inlet of the moving end mechanism 1.

[0026] Please refer to Figure 1 , 2 In this embodiment, the adjusting locking structure 24 includes a connecting block 241 and an adjusting bolt 242. The connecting block 241 is hinged to the mandrel fixing seat 22, and the connecting block 241 is connected to the base 23 through the adjusting bolt 242. The rotation adjustment of the mandrel fixing seat 22 around the fulcrum is achieved by turning the adjusting bolt 242. The position of the connecting block 241 can also be fixed by the nut on the adjusting bolt 242. When the mandrel fixing seat 22 rotates to the correct position around the fulcrum, the nut on the adjusting bolt 242 is tightened to fix the posture of the mandrel fixing seat 22, which is to fix the posture of the mandrel 4.

[0027] Please refer to Figure 1-6 In this embodiment, the stationary end mechanism 2 is further provided with a stationary end connector 25, a slewing connector 26, a turntable 27, and a clamping column 28. The slewing connector 26 is selected as a slewing bearing, or the slewing connector 26 can adopt a structure with a similar function to the slewing bearing. The stationary end connector 25 is fixed on the mandrel 4 and connected to the mold cylinder 3. The outer ring of the slewing bearing is fixed on the stationary end connector 25, and the inner ring of the slewing bearing is connected to the turntable 27. The turntable 27 can rotate relative to the stationary end connector 25 through the slewing bearing. The turntable 27 is also provided with a plurality of sliding grooves 271, each sliding groove 271 having an A end and a B end. The distance L1 from the A end to the axis of the mandrel 4 is greater than the distance L2 from the B end to the axis of the mandrel 4, that is, the B end of the sliding groove 271 is closer to the mandrel 4. The stationary end connector 25 is provided with several through holes radially distributed along the mandrel 4 and a drive unit for rotating the drive turntable 27. The number of sliding grooves 271, through holes, and clamping pins 28 are equal. The clamping pins 28 are inserted into the through holes, and linear bearings connected to the clamping pins 28 are installed in the through holes. One end of the clamping pin 28 is slidably connected to the sliding groove 271, and the other end can be close to or away from the mandrel 4. The drive unit is a hydraulic cylinder. The piston rod of the drive unit is connected to the turntable 27. When the piston rod of the drive unit extends, the drive turntable 27 rotates in the first preset direction, and the clamping pin 28 slides from end B to end A of the sliding groove 271. Under the restriction of the sliding groove 271, the clamping pin 28 moves away from the mandrel 4. When the piston rod of the drive unit retracts, the drive turntable 27 rotates in the second preset direction, and the clamping pin 28 slides from end A to end B of the sliding groove 271, and the clamping pin 28 moves closer to the mandrel 4.

[0028] It should be noted that, please refer to Figure 3 The difference L1-L2 between the distance L1 from end A to the axis of mandrel 4 and the distance L2 from end B to the axis of mandrel 4 can be determined by those skilled in the art based on the actual situation, as long as it meets the following conditions: when the turntable 27 rotates along the second preset direction and the clamping column 28 moves to end B of the slide groove 271, the free end of the clamping column 28 can clamp the tube blank sleeved on the mandrel 4; when the turntable 27 rotates along the first preset direction and the clamping column 28 moves to end A of the slide groove 271, the free end of the clamping column 28 disengages from the tube blank sleeved on the mandrel 4.

[0029] It should be noted that the A end and B end of the slide groove 271 refer to the ends of the slide groove 271 and are located on the center line of the slide groove 271. The slide groove 271 can be an arc groove or a straight groove. In this embodiment, the slide groove 271 is an arc groove.

[0030] Please refer to Figure 5-6It should be noted that the connection between the clamping column 28 and the slide groove 271 can be a roller-slide groove 271 connection, that is, the clamping column 28 is equipped with a roller, which is inserted into the slide groove 271, and the roller can slide between the inner end and the B end of the slide groove 271. Alternatively, the connection between the clamping column 28 and the slide groove 271 can be a bearing-slide groove 271 connection, that is, the clamping column 28 is equipped with a rotating shaft, and the rotating shaft is equipped with a bearing that is rolledly connected to the slide groove 271, and the bearing can slide between the A end and the B end within the slide groove 271. In this embodiment, the connection between the clamping column 28 and the slide groove 271 adopts the bearing-slide groove 271 connection method.

[0031] In existing technology, the moving end seal relies on a combination of a hydraulically powered clamping ball and a rubber sealing ring. The inner diameter of the sealing ring must be slightly smaller than the outer diameter of the tube blank to achieve a seal. Otherwise, it is impossible to prevent high-pressure airflow from passing through the gap without contacting the tube blank. However, in practice, it has been found that when the inner diameter of the sealing ring is smaller than the outer diameter of the tube blank, the friction between the rubber and the high-temperature plastic tube is too great. At the same time, the bending of the PVC tube after baking makes it impossible to overcome the friction force through power. This also exacerbates the uneven circumferential pressure of the sealing ring, increasing the local friction force. Therefore, a seal cannot be achieved in practice.

[0032] For this, please refer to Figure 7-8 This embodiment employs a moving end mechanism 1 comprising a moving end locking cylinder 11, a sealing cylinder 12, a connecting plate 13, and a connecting cylinder 14. One end of the sealing cylinder 12 is connected to the connecting cylinder 14, and the other end of the sealing cylinder 12 is connected to the connecting plate 13. The piston end of the sealing cylinder 12 is provided with a tube blank sealing ring 17, which can drive the tube blank sealing ring 17 to abut against the tube blank. The moving end locking cylinder 11 is connected to the connecting plate 13. Several locking pins 16 are hinged in a circular array along the axial direction of the connecting cylinder 14 on the inner side of the connecting plate 13. The locking pins 16 extend into the connecting cylinder 14, and their free ends have pressure balls that can contact the plastic tube. The piston rod of the moving end locking cylinder 11 extends into the connecting cylinder 14. A wedge block 15 is provided at the end of the piston rod of the moving end locking cylinder 11. The surface of the wedge block 15 has grooves that mate with the locking pins 16. Each locking pin 16 can slide within its corresponding groove. The moving end locking cylinder 11 controls the position of the wedge, thereby controlling the opening or closing of the locking pins 16 via the wedge block 15. Figure 2As shown, the moving end mechanism 1 is now removed, and the tube blank is loaded into the mold cavity from the mold cavity inlet. After the tube blank is loaded, the moving end mechanism 1 is reinstalled and locked. The moving end locking cylinder 11 drives the wedge block 15 to move to the left. The locking pin 16 opens under the drive of the wedge block 15 until it locks the tube blank. Then the sealing cylinder 12 extends and drives the tube blank sealing ring 17 to move to the right until it presses against the end of the tube blank to achieve a seal. When the plastic tube needs to be unloaded after molding, both the moving end locking cylinder 11 and the sealing cylinder 12 retract, the wedge block 15 moves to the right, the locking pin 16 retracts and moves away from the plastic tube, and the tube blank sealing ring 17 moves away from the end of the plastic tube. Then the subsequent actions are performed until the molded plastic tube is taken out.

[0033] Please refer to Figure 1-2 The working principle of the mandrel 4 attitude adjustment in this embodiment is as follows: After being fixed by the mandrel fixing seat 22 and the mandrel 4, it extends into the mold cylinder 3. The mandrel fixing seat 22 is connected to the base 23 through two pins and adjusting bolt 242. At this time, the fulcrum of the mandrel 4 is the pin on the left side of the mandrel fixing seat 22. By tightening the adjusting bolt 242, the right end of the mandrel fixing seat 22 is pulled down, and the mandrel fixing seat 22 will rotate around the pin on the left side. Then the end of the mandrel 4 in the mold cylinder 3 will tilt upward. By continuously measuring the distance to the inner wall of the mold cylinder 3, the adjusting bolt 242 is adjusted to the required angle.

[0034] Please refer to Figure 2 , 7 -8. The working principle of the moving end seal in this embodiment: In the prior art, after the pressing ball is inserted into the tube blank by the moving end locking cylinder 11 to provide radial support, the sealing cylinder 12 pushes the tube blank sealing ring 17 towards the center of the mold cavity because the pressing ball has a self-aligning structure, until it is close to the end face of the tube blank. At this time, the tube blank sealing ring 17 is concentric with the annular surface of the tube blank end face. When the contact distance between the tube blank sealing ring 17 and the tube blank is -5mm, it stops. The tube blank sealing ring 17 is made of rubber and the contact surface is arc-shaped and compressible. In practice, the compression amount is 5mm. After the tube blank is blown up, the pressing ball is returned to its position by the moving end locking cylinder 11, and then the sealing oil pushes the tube blank sealing ring 17 away from the center of the mold cavity to disengage the seal.

[0035] Please refer to Figure 2 , 4-6. Working principle of the stationary end clamping structure in this embodiment: The outer ring of the slewing bearing is connected to the mold cylinder 3, and the inner ring is connected to the turntable 27. When the driving component extends, the turntable 27 rotates around the axis of the mold cylinder 3. The turntable 27 has 12 arc-shaped sliding grooves 271, which limit the movement path of the clamping column 28 bearing. The height difference of the clamping column 28 can be achieved by changing the curvature. The outer diameter of the bearing is always tangent to the surface of the sliding groove 271, that is, it rolls in the sliding groove 271. When the turntable 27 rotates in the second preset direction, the clamping column 28 moves to the B end of the sliding groove 271, and the free end of the clamping column 28 can clamp the tube blank sleeved on the mandrel 4. When the turntable 27 rotates in the first preset direction, the clamping column 28 moves to the A end of the sliding groove 271, and the free end of the clamping column 28 disengages from the tube blank sleeved on the mandrel 4.

[0036] This embodiment adds a rotary connector 26 and a turntable 27 with a groove 271 to the stationary end, so that the rotational motion of the turntable 27 is converted into the linear motion of the output end pressing column 28. Both motion directions are active power, which overcomes the difficulty of the original technology where the pressing ball is stuck and cannot return to its original position due to the expansion and deformation of the tube wall causing the pressing ball to be displaced along the tube blank axial direction.

[0037] This embodiment uses a lever-based adjustment structure to adjust the tilt angle of the mandrel 4, achieving concentricity between the end of the mandrel 4 and the mold cavity inlet. This solves the problem of the mandrel 4 sagging. Furthermore, it avoids the need for expensive alloy materials to achieve concentricity between the end of the mandrel 4 and the mold cavity inlet, similar to a cantilever beam structure, and also avoids complex calculations and practical control of the material's tilt angle. Instead, based on data measurement feedback, the adjusting bolt 242 is adjusted, thereby adjusting the height of the right side of the mandrel fixing seat 22, adjusting the mandrel 4 to a suitable tilt angle. This embodiment uses a sealing cylinder 12 and a tube blank sealing ring 17 to achieve end face sealing, which solves the problem that the tube blank cannot be sealed in the existing technology.

[0038] The above are merely preferred embodiments of this utility model and are not intended to limit the scope of this utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A molecularly oriented plastic tube forming apparatus, comprising a moving end mechanism, a stationary end mechanism, and a mold cylinder connected between the moving end mechanism and the stationary end mechanism, wherein a mandrel is fixed in the stationary end mechanism and the mandrel is located inside the mold cylinder, characterized in that, The stationary end mechanism includes a stationary end connector, a rotary connector, a turntable, and a clamping post. The stationary end connector is fixed to the mandrel. The turntable is connected to the stationary end connector via the rotary connector. The turntable has a sliding groove with end A and end B. The distance from end A to the mandrel axis is greater than the distance from end B to the mandrel axis. The stationary end connector has through holes distributed radially along the mandrel. The clamping post is inserted into the through holes, with one end slidably connected to the sliding groove and the other end able to move closer to or further away from the mandrel. The stationary end connector is also provided with a drive unit for driving the turntable to rotate. When the drive unit drives the turntable to rotate in the first preset direction, the clamping column slides to end A of the groove and the clamping column moves away from the mandrel. When the drive unit drives the turntable to rotate in the second preset direction, the clamping column slides to end B of the groove and the clamping column moves closer to the mandrel.

2. The molecularly oriented plastic tube forming apparatus according to claim 1, characterized in that, The clamping column is equipped with a roller connected to the slide groove.

3. The molecularly oriented plastic tube forming apparatus according to claim 1, characterized in that, The clamping column is equipped with a rotating shaft, which is provided with a bearing that is tactilely connected to the slide groove.

4. The molecularly oriented plastic tube forming apparatus according to claim 1, characterized in that, The groove is either an arc groove or a straight groove.

5. The molecularly oriented plastic tube forming apparatus according to claim 1, characterized in that, The slewing connector is a slewing bearing.

6. The molecularly oriented plastic tube forming apparatus according to claim 1, characterized in that, The stationary end mechanism also includes a mandrel fixing seat and a base. The base is provided with a hinge support point. The mandrel fixing seat is hinged to the hinge support point through a pin. An adjustment and locking structure is also provided between the mandrel fixing seat and the base. The adjustment and locking structure can drive the mandrel fixing seat to rotate around the pin.

7. The molecularly oriented plastic tube forming apparatus according to claim 6, characterized in that, The adjustment and locking structure includes a connecting block and an adjusting bolt. The connecting block is hinged to the mandrel fixing seat, and the connecting block is connected to the base through the adjusting bolt.

8. The molecularly oriented plastic tube forming apparatus according to claim 1, characterized in that, The moving end mechanism includes: a moving end locking cylinder, a sealing cylinder, a connecting plate, and a connecting cylinder. One end of the sealing cylinder is connected to the connecting cylinder, and the other end is connected to the connecting plate. The moving end locking cylinder is connected to the connecting plate. The connecting plate is hinged with locking pins in a ring array along the axial direction of the connecting cylinder. The locking pins extend into the interior of the connecting cylinder. The piston rod of the moving end locking cylinder extends into the connecting cylinder, and a wedge block is provided at the end of the piston rod of the moving end locking cylinder. The wedge block cooperates with the locking pin to control the opening or closing of the locking pin. The piston end of the sealing cylinder is provided with a tube blank sealing ring, and the sealing cylinder can drive the tube blank sealing ring to abut against the tube blank.

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