Multi-station squeezing production line

Abstract

A plurality of plastic extruding machines are arrayed on a workshop floor, a bottom rail is erected above the plastic extruding machines, a longitudinal moving force piece is suitable for driving a longitudinal moving frame to longitudinally move along the bottom rail, a transverse moving force piece is suitable for driving a transverse moving sliding table to transversely move along the longitudinal moving frame, and a crane is connected with the transverse moving sliding table. The crane is suitable for hoisting a finished product frame output by the plastic extruding machine and is also suitable for placing a material frame to a preparation station of the plastic extruding machine, the temporary storage bin is connected with the transverse moving sliding table, a discharging opening of the temporary storage bin is provided with an opening and closing structure, the filling telescopic pipe extends in the vertical direction, and the telescopic power piece is suitable for driving the lower end of the filling telescopic pipe to stretch into or be away from a material barrel of the plastic extruding machine. Compared with the prior art, raw material supply and finished product transfer-out can be carried out above a workshop, so that a channel between plastic extruding machines can be narrowed, more plastic extruding machines can be arrayed in the workshop, and the utilization rate of industrial land in the workshop is increased.

Description

Technical Field

[0001] The utility model relates to extrusion production, in particular to a multi-station extrusion production line. Background Art

[0002] Plastic products are the most commonly used components in toys, and toy manufacturers generally have multiple extrusion molding machines / extruders.

[0003] In practice, it has been found that when multiple extruders are deployed, a large aisle must be reserved to allow for forklifts or material transport carts to move horizontally and vertically to refill the extruders with pellets and to facilitate the collection of plastic products. In addition, the aisle must also retain a pedestrian passage. As can be seen, in this setup, the distance between the extruders is large, occupying a large amount of industrial land. Utility Model Content

[0004] The utility model aims to solve at least one of the technical problems mentioned above, and provides a multi-station extrusion production line that uses overhead material transfer to solve the problem of large spacing between extruders and improve the utilization rate of industrial land.

[0005] In order to achieve the above purpose, the technical solution adopted by the utility model is:

[0006] A multi-station extrusion production line includes a bottom rail, a longitudinal movement unit, a transverse movement unit, a crane, a buffer bin, a filling telescopic tube, a telescopic power member and a plurality of extruders, wherein the plurality of extruders are arrayed on the workshop floor, the bottom rail is erected above the plurality of extruders, the longitudinal movement unit includes a longitudinal movement frame and a longitudinal movement force member, the longitudinal movement force member is suitable for driving the longitudinal movement frame to move longitudinally along the bottom rail, the longitudinal movement frame extends transversely, the transverse movement unit includes a transverse slide and a transverse movement force member, the transverse movement force member is suitable for driving The transverse slide moves laterally along the longitudinal frame, the crane is connected to the transverse slide, the crane is suitable for lifting the finished product frame output by the extruder, and is also suitable for placing the material frame to the preparation station of the extruder, the buffer bin is connected to the transverse slide, the blanking port of the buffer bin is provided with an opening and closing structure, the filling telescopic tube extends vertically, the upper end of the filling telescopic tube is suitable for docking with the blanking port of the buffer bin, and the telescopic power part is suitable for driving the lower end of the filling telescopic tube to extend into or away from the material barrel of the extruder.

[0007] Compared with the existing technology, the beneficial effects of this application include: being able to supply raw materials and transfer finished products above the workshop, narrowing the channels between extruders, arranging more extruders in the workshop, and improving the utilization rate of the workshop's industrial land.

[0008] As an improvement of the above technical solution, the longitudinal moving frame is provided with a control room, and the control room is provided with a central console. The central console is suitable for controlling the transverse moving unit, the longitudinal moving unit, the crane, the opening and closing structure and the telescopic power part. The control room is provided with an observation window suitable for observing the extruder and its barrel.

[0009] As an improvement of the above technical solution, the workshop is provided with a partition, and the partition is provided with a raw material warehouse. The raw material warehouse is located above the longitudinal movement unit and the transverse movement unit. The buffer warehouse is suitable for being transferred to the bottom of the raw material warehouse to receive the rubber material in the raw material warehouse.

[0010] As an improvement of the above technical solution, the crane includes a seat block, a winch main shaft, a winch motor, an auxiliary shaft, a movable pulley and a wire rope. The seat block is connected to the transverse slide, and the winch main shaft and the auxiliary shaft are both rotatably connected to the seat block. The middle part of the wire rope is hung around the auxiliary shaft. The wire rope segment pulled out from one side of the auxiliary shaft passes around the lower edge of the movable pulley and is wound around the winch main shaft. The wire rope segment pulled out from the other side of the auxiliary shaft passes around the lower edge of the movable pulley and is connected to the seat block. A hook is provided at the lower end of the movable pulley housing.

[0011] As an improvement to the above technical solution, the longitudinal moving frame is provided with a lifting capacity mark.

[0012] As an improvement to the above technical solution, anti-collision rubber columns are provided at both ends of the longitudinal direction of the longitudinal moving frame, and the rubber columns are made of plastic, silicone or latex.

[0013] As an improvement of the above technical solution, the opening and closing structure includes a mounting seat, a rotary valve and an opening and closing motor. The rotary valve includes a rotor and a plurality of baffles protruding from the peripheral wall of the rotor. The plurality of baffles are distributed at equal intervals along the circumference of the rotor. The buffer bin and the mounting seat jointly hold the end of the rotor. The opening and closing motor is suitable for driving the rotary valve to rotate. The two adjacent baffles are suitable for moving the rubber particles in the buffer bin to the discharge port of the mounting seat.

[0014] As an improvement of the above technical solution, the transverse slide is provided with a transfer hole, the cache bin is connected to the transverse slide through the mounting seat, the discharge port of the mounting seat is docked with the transfer hole, and the filling telescopic tube is suitable for docking with the transfer hole below the transverse slide.

[0015] As an improvement of the above technical solution, the filling telescopic tube includes an inner tube, a middle tube surrounding the inner tube, and an outer tube surrounding the middle tube. The upper end of the inner tube is provided with a convex eaves, and the convex eaves are suitable for connecting to the cache bin or the transverse slide. The lower end face of the inner tube is detachably connected to a first retaining ring, and the first retaining ring is suitable for preventing the middle tube from falling off the inner tube downward. The telescopic power part is connected to the outer tube, and the lower end of the outer tube is detachably connected to a second retaining ring, and the second retaining ring is suitable for lifting the middle tube upward. A third retaining ring is provided at the lower end of the middle tube, and the third retaining ring is suitable for preventing the outer tube from falling off the middle tube downward.

[0016] As an improvement to the above technical solution, the second retaining ring is connected to the inner circumferential wall of the outer tube through a threaded outer circumferential wall thereof, and the inner ring of the second retaining ring is configured as an inverted conical surface. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The following is a further detailed description of the specific embodiments of the present invention with reference to the accompanying drawings, wherein:

[0018] Figure 1 This is a schematic structural diagram of a multi-station extrusion production line according to an embodiment of the present utility model;

[0019] Figure 2 for Figure 1 Shows the schematic diagram of the longitudinal movement unit structure of the multi-station extrusion production line;

[0020] Figure 3 for Figure 1 Shows a partial structural diagram of a multi-station extrusion production line;

[0021] Figure 4 for Figure 1 Shows a schematic diagram of the crane structure of a multi-station extrusion production line;

[0022] Figure 5 for Figure 1 Shows a schematic diagram of the buffer warehouse structure of a multi-station extrusion production line;

[0023] Figure 6 for Figure 5 A cross-sectional view showing a cache bin;

[0024] Figure 7 for Figure 1 Shows a schematic diagram of the filler telescopic tube structure of a multi-station extrusion production line;

[0025] Figure 8 for Figure 1 A cross-sectional view of the packing bellows is shown.

[0026] The accompanying drawings are only one specific embodiment of the present invention, and the form and structure of this specific embodiment should not limit the scope of other embodiments.

[0027] Extruder (100, barrel (110;

[0028] Bottom rail(200;

[0029] Longitudinal movement unit (300, longitudinal movement frame (310, longitudinal movement force member (320;

[0030] Transverse moving unit (400, transverse moving slide (410, transverse moving force member (420;

[0031] Crane (500, seat block (510, hoisting main shaft (520, hoisting motor (530, auxiliary shaft (540, movable pulley (550, wire rope (560, hook (570);

[0032] Cache (600, mounting seat (610, rotary valve (620, rotor (621, baffle (622, opening and closing motor (630;

[0033] Filler expansion tube (700), inner tube (710, convex eaves (711), first baffle ring (712, middle tube (720), third baffle ring (721), outer tube (730, second baffle ring (731). DETAILED DESCRIPTION

[0034] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0035] Reference Figures 1 to 3The utility model provides a multi-station extrusion production line, comprising a bottom rail (200), a longitudinal moving unit (300), a transverse moving unit (400), a crane (500), a buffer bin (600), a filling telescopic tube (700), a telescopic power member and a plurality of extruders (100), wherein the plurality of extruders (100) are arrayed on a workshop floor, the bottom rail (200) is erected above the plurality of extruders (100), the longitudinal moving unit (300) comprises a longitudinal moving frame (310) and a longitudinal moving power member (320), the longitudinal moving power member (320) being adapted to drive the longitudinal moving frame (310) to move longitudinally along the bottom rail (200), the longitudinal moving frame (310) extending transversely, the transverse moving unit (400) comprising a transverse sliding table (410) and a transverse moving power member Part (420), the transverse moving force part (420 is suitable for driving the transverse sliding table (410) to move transversely along the longitudinal moving frame (310), the crane (500) is connected to the transverse sliding table (410), the crane (500) is suitable for lifting the finished product frame output by the extruder (100), and is also suitable for placing the material frame to the preparation station of the extruder (100), the buffer bin (600) is connected to the transverse sliding table (410, and the blanking port of the buffer bin (600) is provided with an opening and closing structure, the filling telescopic tube (700) extends vertically, the upper end of the filling telescopic tube (700) is suitable for docking with the blanking port of the buffer bin (600), and the telescopic power part is suitable for driving the lower end of the filling telescopic tube (700) to extend into or away from the barrel (110) of the extruder (100).

[0036] The longitudinal moving force member (320) and the transverse moving force member (420) can be a traveling structure, which includes a traveling wheel and a motor that is connected to the traveling wheel. The longitudinal moving frame (310) and the transverse moving slide (410) are provided with the traveling wheel. The longitudinal moving force member (320) and the transverse moving force member (420) can also be a combination structure of a motor and a belt / chain / screw nut pair / gear rack. The motor is connected to the belt / chain to make the belt / chain rotate back and forth. The longitudinal moving frame (310) and the transverse moving slide (410) are fixedly connected to one of the points of the corresponding belt / chain; or, the longitudinal moving frame (310) and the transverse moving slide (410) are fixedly connected to the corresponding nut block, and the motor drives the screw to rotate to make the nut block slide; or, the rack serves as a traveling rail, the gear serves as a traveling wheel, and is connected to the corresponding motor. The motor can be an electric motor (motor), a hydraulic motor, or a pneumatic motor.

[0037] In the present invention, the transverse moving unit (400) is stacked on the longitudinal moving unit (300), and the transverse moving unit (400) and the longitudinal moving unit (300) together enable the crane (500), the buffer bin (600), the filler telescopic tube (700) and the filler telescopic power member to move transversely and longitudinally. The longitudinal moving unit (300) is stacked on the transverse moving unit (400), and the longitudinal moving frame (310) and the transverse moving slide (410) are correspondingly replaced, which is an equivalent replacement.

[0038] The cables and / or hoses between the bottom rail (200) and the longitudinal moving force member (320), and between the longitudinal moving frame (310) and the transverse moving force member (420) can be in the form of tracks, with the two ends of the tracks connected to corresponding points respectively. The tracks can bend and change with the movement, which is common knowledge in machine tool settings; the cables / hoses can also be in the form of rollers, with a plurality of rollers being provided. The rollers rotate relative to their rotation axes during rolling, and the plurality of rollers are arranged at intervals along the cables / hoses. The rotation axes of the rollers are connected to the cables / hoses. When two adjacent rollers approach or move away from each other, the cables / hoses between the two adjacent rollers are drooped or straightened.

[0039] The operation process of the present invention is as follows: when the finished product frame in the extruder (100) is filled with a sufficient amount of plastic products, the extruder (100) pushes the material frame of the preparation station to push the preparation material frame into the working station, and the preparation material frame pushes the finished product frame out of the extruder (100). The crane (500) puts a new material frame into the preparation station of the extruder (100) and takes the finished product frame away; when the rubber material in the barrel (110) of the extruder (100) is used up, the buffer bin (600) and the filling telescopic tube (700) are transferred to the upper part of the barrel (110), the telescopic tube is extended downward to be inserted into the barrel (110), and the drop opening of the buffer bin (600) is opened to facilitate the filling of rubber pellets into the barrel (110).

[0040] More preferably, the system further includes a controller, which may be a single chip microcomputer, a PLC, a DSP, an FPGA, a personal computer, etc. The extruder (100), the longitudinal force member (320), the transverse force member (420), the crane (500), the opening and closing structure, the telescopic power member, etc. are electrically connected to the controller. The system further includes a switch panel, and each switch unit of the switch panel is electrically connected to the controller.

[0041] In the fully automatic control, when the finished product frame of the extruder (100) is full of plastic products, the extruder (100) pushes the material frame of the preparation station, so that the preparation material frame is pushed into the working position. The preparation material frame pushes the finished product frame out of the extruder (100). The controller receives a detection signal and controls the transverse movement unit (400) and the longitudinal movement unit (300) to move the crane (500) above the extruder (100) to replenish the preparation material frame at the preparation station of the extruder (100) and then lift the finished product frame away. When the barrel (110) of the extruder (100) has finished outputting the rubber material, the controller receives a detection signal and controls the transverse movement unit (400) and the longitudinal movement unit (300) to move the buffer bin (600) and the filling telescopic tube (700) above the barrel (110) to complete the replenishment of the rubber pellets in the barrel (110).

[0042] In some embodiments of the present invention, the longitudinal moving frame (310) is provided with a control room, and the control room is provided with a central console. The central console is suitable for controlling the transverse moving unit (400), the longitudinal moving unit (300), the crane (500), the opening and closing structure and the telescopic power member. The control room is provided with an observation window suitable for observing the extruder (100) and its barrel (110). It can be understood that the central console includes a switch panel and even includes a display screen, a DVD, an audio system, etc.

[0043] Compared with the prior art, the beneficial effects of the present application include: being able to replenish raw materials and transfer finished products over the workshop, narrowing the passages between the extruders (100), enabling the workshop to array more extruders (100), and improving the utilization rate of the workshop's industrial land.

[0044] Preferably, the workshop is provided with a partition, the partition is provided with a raw material warehouse, the raw material warehouse is located above the longitudinal movement unit (300) and the transverse movement unit (400), and the buffer warehouse (600) is suitable for being transferred to the bottom of the raw material warehouse to receive the rubber material in the raw material warehouse.

[0045] Preferably, the workshop is provided with a first ladder suitable for climbing to the control room, the control room is connected to the lower end of the longitudinal moving frame (310), and the longitudinal moving frame (310) is provided with a second ladder, which extends from the control room to the upper end of the longitudinal moving frame (310). When leaving get off work on a daily basis, workers can climb to the upper end of the longitudinal moving frame (310) to cover the upper end of the buffer warehouse (600) to prevent insects and rodents from entering the buffer warehouse (600).

[0046] Reference Figure 1 and Figure 4 In some embodiments of the present invention, the crane (500) includes a seat block (510), a hoisting main shaft (520), a hoisting motor (530), an auxiliary shaft (540), a movable pulley (550) and a wire rope (560). The seat block (510) is connected to the transverse slide (410). The hoisting main shaft (520) and the auxiliary shaft (540) are both rotatably connected to the seat block (510). The middle portion of the wire rope (560) is hung around the auxiliary shaft (540). The wire rope (560) pulled out from one side of the auxiliary shaft (540) is segmented around the lower edge of the movable pulley (550) and then wound around the hoisting main shaft (520). The steel wire rope (560) pulled out from the other side of the auxiliary shaft (540) is divided into sections and passes around the lower edge of the movable pulley (550) and is connected to the seat block (510). A hook (570) is provided at the lower end of the outer shell of the movable pulley (550). It can be understood that the movable pulley (550) includes an outer shell and a movable wheel. In the present invention, four sections of rope are used to lift the movable pulley (550) and the items hung thereon. The hoisting motor (530) and the hoisting main shaft (520) are only responsible for one of them. The lifting force exerted by the hoisting motor (530) is one-fourth of the load. The present invention effectively improves the hanging capacity of the hoisting motor (530).

[0047] In some embodiments of the present invention, the longitudinal moving frame (310) is provided with a lifting capacity mark.

[0048] In some embodiments of the present invention, anti-collision rubber columns are provided at both ends of the longitudinal direction of the longitudinal moving frame (310), and the rubber columns are made of plastic, silicone or latex.

[0049] Reference Figure 1 、 Figure 3 、 Figure 5 and Figure 6 In some embodiments of the present invention, the opening and closing structure includes a mounting seat (610), a rotary valve (620) and an opening and closing motor (630). The rotary valve (620) includes a rotor (621) and a plurality of baffles (622) protruding from the peripheral wall of the rotor (621). The plurality of baffles (622) are evenly spaced along the circumference of the rotor (621). The buffer chamber (600) and the mounting seat (610) jointly hold the end of the rotor (621). The opening and closing motor (630) is suitable for driving the rotary valve (620) to rotate. The two adjacent baffles (622) are suitable for moving the rubber particles in the buffer chamber (600) to the discharge port of the mounting seat (610). It can be understood that in the present invention, the rotary valve (620) is easy to disassemble and assemble. The buffer chamber (600) can be closed by stopping the rotary valve (620), and the buffer chamber (600) can be continuously discharged by rotating the rotary valve (620). It can be understood that the end of the rotor (621) is held, which does not mean that the rotation of the rotor (621) is locked.

[0050] Reference Figure 1 In some embodiments of the present invention, the transverse slide (410) is provided with a transfer hole, the buffer bin (600) is connected to the transverse slide (410) through the mounting base (610), the discharge port of the mounting base (610) is docked with the transfer hole, and the filling telescopic tube (700) is adapted to dock with the transfer hole below the transverse slide (410).

[0051] Reference Figure 1 、 Figure 3 、 Figure 7 and Figure 8In some embodiments of the present invention, the filling telescopic tube (700) includes an inner tube (710), a middle tube (720) surrounding the inner tube (710), and an outer tube (730) surrounding the middle tube (720). The upper end of the inner tube (710) is provided with a convex eave (711), and the convex eave (711) is suitable for connecting to the buffer bin (600) or the transverse slide (410). The lower end surface of the inner tube (710) is detachably connected to a first retaining ring (712), and the first retaining ring (712 is suitable for preventing the middle tube (720) from falling off the inner tube (710). The telescopic power member is connected to the outer tube (730), and the lower end of the outer tube (730) is detachably connected to a second retaining ring (731), and the second retaining ring (731) is suitable for lifting the middle tube (720) upward. 0, a third retaining ring (721) is provided at the lower end of the middle tube (720, and the third retaining ring (721) is adapted to prevent the outer tube (730) from being disengaged downward from the middle tube (720). In the present invention, the inner tube (710), the middle tube (720) and the outer tube (730) are detachable for easy maintenance, replacement and cleaning. The telescopic power member can be simply a cylinder body, such as a pneumatic cylinder, an electric cylinder or a hydraulic cylinder; the telescopic power member can also be a winding machine and a lifting rope, one end of the lifting rope is connected to the outer tube (730, and the other end is wound on the winding machine; the telescopic power member can also be a combination structure of a motor and a gear rack / screw nut pair, the rack / screw being connected to the upper end of the outer tube (730), and the motor driving the gear / nut block to rotate so that the rack / screw moves up and down.

[0052] Reference Figure 8 In some embodiments of the present invention, the second retaining ring (731) is connected to the inner wall of the outer tube (730) through a threaded connection on its outer wall, and the inner ring of the second retaining ring (731) is configured as an inverted conical surface. In the present invention, the appearance of the lower end of the outer tube (730) is relatively smooth, and the inner conical second retaining ring (731) facilitates the full discharge of the rubber material.

[0053] The above embodiments are only used to illustrate the technical solution of the present invention and are not intended to limit the present invention. Any modification or equivalent replacement that does not depart from the spirit and scope of the present invention shall be included in the scope of the technical solution of the present invention.

Claims

1. A multi-station extrusion production line, characterized in that: include: Multiple extruders are arrayed on the workshop floor; A bottom rail is mounted above the plurality of extruders; A longitudinal movement unit comprises a longitudinal movement frame and a longitudinal movement force member, wherein the longitudinal movement force member is adapted to drive the longitudinal movement frame to move longitudinally along the bottom rail, and the longitudinal movement frame extends in a transverse direction; A transverse movement unit, comprising a transverse movement slide and a transverse movement force member, wherein the transverse movement force member is adapted to drive the transverse movement slide to move transversely along the longitudinal movement frame; A crane connected to the transverse slide, the crane being suitable for hoisting the finished product frame output by the extruder and also suitable for placing the material frame to the preparatory station of the extruder; A buffer bin is connected to the transverse slide, and a blanking port of the buffer bin is provided with an opening and closing structure; A filling telescopic tube and a telescopic power member, wherein the filling telescopic tube extends vertically, the upper end of the filling telescopic tube is suitable for docking with the dropout port of the buffer bin, and the telescopic power member is suitable for driving the lower end of the filling telescopic tube to extend into or away from the barrel of the extruder.

2. The multi-station extrusion production line according to claim 1, characterized in that: The longitudinal moving frame is provided with a control room, and the control room is provided with a central console. The central console is suitable for controlling the transverse moving unit, the longitudinal moving unit, the crane, the opening and closing structure and the telescopic power part. The control room is provided with an observation window suitable for observing the extruder and its barrel.

3. The multi-station extrusion production line according to claim 1, characterized in that: The workshop is provided with a partition, and the partition is provided with a raw material warehouse. The raw material warehouse is located above the longitudinal movement unit and the transverse movement unit. The buffer warehouse is suitable for being transferred to the bottom of the raw material warehouse to receive the rubber material in the raw material warehouse.

4. The multi-station extrusion production line according to claim 1, characterized in that: The crane includes a seat block, a hoisting main shaft, a hoisting motor, an auxiliary shaft, a movable pulley and a wire rope. The seat block is connected to the transverse slide. The hoisting main shaft and the auxiliary shaft are both rotatably connected to the seat block. The middle part of the wire rope is hung around the auxiliary shaft. The wire rope segment pulled out from one side of the auxiliary shaft passes around the lower edge of the movable pulley and is wound around the hoisting main shaft. The wire rope segment pulled out from the other side of the auxiliary shaft passes around the lower edge of the movable pulley and is connected to the seat block. A hook is provided at the lower end of the movable pulley housing.

5. The multi-station extrusion production line according to claim 4, characterized in that: The longitudinal moving frame is provided with a lifting capacity mark.

6. The multi-station extrusion production line according to any one of claims 1 to 5, characterized in that: Anti-collision rubber columns are provided at both ends of the longitudinal moving frame, and the rubber columns are made of plastic, silicone or latex.

7. The multi-station extrusion production line according to any one of claims 1 to 5, characterized in that: The opening and closing structure includes a mounting seat, a rotary valve and an opening and closing motor. The rotary valve includes a rotor and a plurality of baffles protruding from the peripheral wall of the rotor. The plurality of baffles are distributed at equal intervals along the circumference of the rotor. The buffer bin and the mounting seat jointly hold the end of the rotor. The opening and closing motor is suitable for driving the rotary valve to rotate. The two adjacent baffles are suitable for moving the rubber particles in the buffer bin to the discharge port of the mounting seat.

8. The multi-station extrusion production line according to claim 7, characterized in that: The transverse slide is provided with a transfer hole, the buffer bin is connected to the transverse slide via the mounting seat, the discharge port of the mounting seat is docked with the transfer hole, and the filler telescopic tube is suitable for docking with the transfer hole below the transverse slide.

9. The multi-station extrusion production line according to any one of claims 1 to 5, characterized in that: The filling telescopic tube includes an inner tube, a middle tube surrounding the inner tube, and an outer tube surrounding the middle tube. The upper end of the inner tube is provided with a convex eaves, and the convex eaves are suitable for connecting to the cache bin or the transverse slide. The lower end face of the inner tube is detachably connected to a first retaining ring, and the first retaining ring is suitable for preventing the middle tube from falling off the inner tube downward. The telescopic power part is connected to the outer tube, and the lower end of the outer tube is detachably connected to a second retaining ring, and the second retaining ring is suitable for lifting the middle tube upward. A third retaining ring is provided at the lower end of the middle tube, and the third retaining ring is suitable for preventing the outer tube from falling off the middle tube downward.

10. The multi-station extrusion production line according to claim 9, characterized in that: The second retaining ring is threadedly connected to the inner circumferential wall of the outer tube through its outer circumferential wall, and the inner ring of the second retaining ring is configured as an inverted conical surface.

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