CN218084079U - Extruder and adjustable extrusion die head thereof - Google Patents

Abstract

The utility model discloses an extruder and adjustable extrusion die head thereof, include the feeding seat with the fuselage intercommunication, with the main die body of feeding seat intercommunication, insert the last die sleeve of locating main die body inside top, insert the lower die sleeve of locating the inside below of main die body, insert the unloading cover of locating in last die sleeve, connect in the outer die sleeve of main die body bottom, and set up on the main die body, a gear drive mechanism for driving the unloading cover through gear drive and carrying out vertical elevating movement, leave the gap as the runner between the outer wall of unloading cover and the inner wall of lower die sleeve, the unloading chute with the runner intercommunication is seted up on the top of outer die sleeve, the bottom of unloading cover is provided with and is used for keeping off the material slope with unloading chute complex, with adjust the unloading chute when unloading cover elevating movement and keep off the clearance on material slope. So, drive the unloading cover through gear drive mechanism and carry out elevating movement, the synchronous change keeps off the material slope and the clearance of unloading chute, realizes flow control. The utility model discloses still disclose an extruder, its beneficial effect as above.

Description

Extruder and adjustable extrusion die head thereof

Technical Field

The utility model relates to an extrusion moulding technical field, in particular to adjustable extrusion die head. The utility model discloses still relate to an extruder.

Background

The extruder is one of the important components of the extrusion blow molding device, the extrusion die head is the core component of the extruder, the mechanical property and the appearance quality of products, the uniformity among batches of finished products, the production efficiency and the economy of molding processing are greatly influenced, and the stability during canning and sealing of the medical-grade products has great relation to the integral yield and whether the products are qualified or not.

At present, in the extrusion die head device of the traditional extruder, after materials in a molten state enter each tube blank channel from a machine body, the materials are gradually extruded through a die, and the shape and the structure of the die are fixed when leaving a factory, so that the discharge flow of the extrusion die head is kept fixed, and the discharge flow of a plurality of tube blank channels is further kept consistent theoretically. However, due to the influence of factors such as manufacturing and processing errors, the uniformity of the roughness and the processing precision of the flow channel where each tube blank is located cannot be guaranteed, and the uniformity of the temperature of each tube blank also causes that the flow rate of the molten material in each tube blank is difficult to keep consistent in practice. In addition, in the actual production process, the extruder may need to simultaneously produce a plurality of products with different types and different specifications, different products may need to use different flow rates, and the extrusion die head with fixed flow rate in the prior art cannot be sufficient.

Therefore, how to realize the flow regulation of the molten material in the tube blank flow passage is a technical problem faced by the technical personnel in the field.

SUMMERY OF THE UTILITY MODEL

The utility model aims at providing an adjustable extrusion die head can realize the flow control of melting material in the pipe runner. Another object of the utility model is to provide an extruder.

In order to solve the technical problem, the utility model provides an adjustable extrusion die head, include with the feeding seat of fuselage intercommunication, with the master mould body of feeding seat intercommunication, insert and locate the last die sleeve of master mould body inside top, insert and locate the lower die sleeve of master mould body inside below, insert and locate go up the unloading cover in the die sleeve, connect in the outer die sleeve of master mould body bottom, and set up in on the master mould body, be used for driving through gear drive the gear drive mechanism that the unloading cover carries out vertical elevating movement, the outer wall of unloading cover with leave the gap as the runner between the inner wall of lower die sleeve, the top of outer die sleeve seted up with the unloading chute of runner intercommunication, the bottom of unloading cover be provided with be used for with unloading chute complex keeps off the material slope, with adjust during unloading cover elevating movement the unloading chute with the clearance that keeps off the material slope.

Preferably, the gear driving mechanism comprises a rotating shaft vertically arranged at the top end of the main die body, a driving gear rotatably sleeved on the rotating shaft, and a driven gear rotatably sleeved on the top of the blanking sleeve, the driving gear is in meshing transmission with the driven gear, and the inner circular surface of the driven gear and the outer wall of the top of the blanking sleeve form thread transmission.

Preferably, the gear driving mechanism further comprises a gear mounting seat arranged at the top end of the upper die sleeve and used for positioning and mounting the driven gear so as to limit the vertical freedom of movement of the driven gear.

Preferably, the gear driving mechanism further comprises a support pillar vertically arranged at the top end of the main die body and a cover pressing plate covered on the support pillar, the top end of the rotating shaft is inserted into the bottom surface of the cover pressing plate, and the top end of the gear mounting seat abuts against the bottom surface of the cover pressing plate.

Preferably, the blanking die further comprises a mandrel inserted in the blanking sleeve in a vertically sliding manner, and a wall thickness adjusting mechanism arranged on the main die body and used for driving the mandrel to perform vertical lifting motion, wherein an adjusting cone is arranged at the bottom end of the mandrel, and a discharging cone groove matched with the adjusting cone is formed in the bottom end of the outer die sleeve so as to adjust the gap between the adjusting cone and the discharging cone groove during lifting motion of the mandrel.

Preferably, the outer wall of the top of the mandrel is provided with threads and forms a screw rod, and the wall thickness adjusting mechanism comprises a transmission nut which is rotatably arranged at the top end of the main die body and forms thread transmission with the screw rod.

Preferably, the wall thickness adjusting mechanism further comprises a nut mounting seat arranged at the top end of the main die body and used for positioning and mounting the transmission nut so as to limit the vertical movement freedom degree of the transmission nut.

Preferably, the gas inlet joint is communicated with the gas inlet at the top end of the mandrel, a gas outlet is formed in the bottom end of the adjusting cone, and the gas outlet is communicated with the gas inlet.

Preferably, the die further comprises a plurality of adjusting screws inserted in the radial direction of the outer die sleeve and arranged on the outer edge of the outer die sleeve, and the adjusting screws are used for adjusting the thickness of the outer die sleeve in the circumferential direction.

The utility model also provides an extruder, including the fuselage and with the adjustable extrusion die that the fuselage links to each other, wherein, adjustable extrusion die specifically is above-mentioned arbitrary adjustable extrusion die.

The utility model provides an adjustable extrusion die head mainly includes feeding seat, die body, goes up the die sleeve, goes down die sleeve, unloading cover, outer die sleeve and gear drive mechanism. The feeding seat is communicated with the machine body and is mainly used for introducing molten materials into the feeding seat from the machine body to realize feeding. The main die body is a main body structure of the extrusion die head and is mainly used for mounting and containing other parts, a plurality of tube blanks are arranged in the main die body, and the main die body is communicated with the feeding seat so that the molten materials can respectively enter all the tube blanks in the main die body through the feeding seat. The upper die sleeve is inserted above each tube blank in the main die body, the lower die sleeve is inserted below each tube blank in the main die body, and a preset space is arranged between the upper die sleeve and the lower die sleeve and can be used for molten materials to flow. The blanking sleeve is also inserted into each tube blank in the main die body, is specifically inserted into the upper die sleeve and extends along the tube blank, an annular gap is reserved between the outer wall of the blanking sleeve and the inner wall of the lower die sleeve, and the gap is communicated with a preset interval space between the upper die sleeve and the lower die sleeve and mainly used as a flow channel for molten materials in the tube blank. The outer die sleeve is connected to the bottom of the main die body and is a die part of the extrusion die head, and the molten material is discharged and formed through the outer die sleeve. The gear driving mechanism is arranged on the main die body, the output end of the gear driving mechanism is connected with the blanking sleeve, and the gear driving mechanism is mainly used for driving the blanking sleeve to perform vertical lifting motion in the tube blank in a gear transmission mode. Importantly, a discharging chute is arranged at the top end of the outer die sleeve, and a notch of the discharging chute is communicated with an outlet of the flow channel so that the molten material enters the discharging chute through the flow channel. Simultaneously, be provided with in the bottom of unloading cover and keep off the material slope, should keep off material slope mainly used and the cooperation of unloading chute: when the gear driving mechanism drives the blanking sleeve to vertically move downwards, the slope surface of the material blocking slope gradually approaches the groove wall of the blanking chute, the gap between the slope surface and the material blocking slope gradually becomes smaller, which is equivalent to the narrowing of a flow passage, so that the material flow is reduced; when the gear driving mechanism drives the blanking sleeve to vertically rise, the slope surface of the material blocking slope is gradually far away from the groove wall of the blanking chute, the gap between the material blocking slope and the blanking chute is gradually increased, which is equivalent to the widening of the flow channel, so that the material flow is improved. Therefore, the utility model provides an adjustable extrusion die head, gear drive through gear drive mechanism carries out vertical elevating movement with power transmission to unloading cover in the pipe with the drive unloading cover to carry out elevating movement's in-process at the unloading cover, the clearance of the material stopping slope of synchronous change unloading cover and the unloading chute of outer die sleeve, and then the volume size of synchronous change runner realizes the flow control of melting material in the pipe runner.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required to be used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the provided drawings without creative efforts.

Fig. 1 is a schematic overall structure diagram of a specific embodiment of the present invention.

Fig. 2 is an enlarged schematic view of the middle structure of fig. 1.

Fig. 3 is an enlarged schematic view of a lower structure of fig. 1.

Fig. 4 is an enlarged schematic view of the upper structure of fig. 1.

Fig. 5 is another view of fig. 1.

Wherein, in fig. 1-5:

a flow channel-a;

the device comprises a machine body-1, a feeding seat-2, a main die body-3, an upper die sleeve-4, a lower die sleeve-5, a blanking sleeve-6, an outer die sleeve-7, a gear driving mechanism-8, a mandrel-9, a wall thickness adjusting mechanism-10, an air inlet joint-11, an adjusting screw-12 and a shunt pipeline-13;

the automatic material-blocking device comprises a material-blocking slope 61, a discharging chute 71, a discharging conical groove 72, a rotating shaft 81, a driving gear 82, a driven gear 83, a gear mounting seat 84, a support column 85, a cover pressing plate 86, an adjusting cone 91, a screw rod 92, an air inlet 93, an air outlet 94, a transmission nut 101 and a nut mounting seat 102.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.

Referring to fig. 1, fig. 2, fig. 3, fig. 4, and fig. 5, fig. 1 is a schematic diagram of an overall structure of an embodiment of the present invention, fig. 2 is an enlarged schematic diagram of a middle structure of fig. 1, fig. 3 is an enlarged schematic diagram of a lower structure of fig. 1, fig. 4 is an enlarged schematic diagram of an upper structure of fig. 1, and fig. 5 is a schematic diagram of another view angle of fig. 1 (arrows in the drawings indicate a flowing direction of a molten material in a flow channel a).

The utility model provides an among the specific embodiment, adjustable extrusion die head mainly includes feeding seat 2, main mould body 3, goes up die sleeve 4, lower die sleeve 5, unloading cover 6, outer die sleeve 7 and gear drive mechanism 8.

The feeding seat 2 is communicated with the machine body 1 and is mainly used for introducing molten materials into the feeding seat 2 from the machine body 1 to realize feeding.

The main die body 3 is a main structure of the extrusion die head, and is mainly used for installing and accommodating other parts, and a plurality of tube blanks, for example, 4 or more, are arranged in the main structure. The main mold body 3 is communicated with the feeding base 2, so that the molten material enters each tube blank in the main mold body 3 through the feeding base 2. Generally, in order to realize uniform feeding of molten materials, a multi-stage shunt pipeline 13, for example, 4 shunt pipelines 13 in 2 stages, is disposed between the machine body 1 and the feeding base 2, and after the molten materials enter from the feeding base 2, the molten materials can be equally divided into 4 shunt pipelines 13 and respectively enter into 4 tube blanks. The shunt pipeline 13 has no dead angle and no step structure, and ensures smooth flow of the molten material.

The upper die sleeve 4 is inserted above each tube blank in the main die body 3, the lower die sleeve 5 is inserted below each tube blank in the main die body 3, and a preset space is formed between the upper die sleeve and the lower die sleeve for the flow of the molten materials. Generally, an arc-shaped ring groove is formed in the outer wall of the lower die sleeve 5 and is communicated with the shunt pipeline 13, so that the molten materials are uniformly mixed in the arc-shaped ring groove and reach a certain pressure, and then flow upwards to pass through a preset spacing space between the upper die sleeve 4 and the lower die sleeve 5. Specifically, the predetermined space may be formed in an arc shape so that the molten material smoothly flows from the outer wall to the inner wall of the lower mold sleeve 5 through the top.

The blanking sleeve 6 is also inserted into each tube blank in the main die body 3, is specifically inserted into the upper die sleeve 4 and extends along the tube blank, an annular gap is left between the outer wall of the blanking sleeve 6 and the inner wall of the lower die sleeve 5, and the gap is communicated with a preset interval space between the upper die sleeve 4 and the lower die sleeve 5 and mainly serves as a flow channel a of a molten material in the tube blank.

The outer die sleeve 7 is connected to the bottom of the main die body 3 and is a die part of the extrusion die head, and the molten material is discharged and formed through the outer die sleeve 7.

The gear driving mechanism 8 is arranged on the main die body 3, the output end of the gear driving mechanism is connected with the blanking sleeve 6, and the gear driving mechanism is mainly used for driving the blanking sleeve 6 to perform vertical lifting motion in the tube blank in a gear transmission mode.

Importantly, a discharging chute 71 is arranged at the top end of the outer die sleeve 7, and the notch of the discharging chute 71 is communicated with the outlet of the flow channel a, so that the molten material enters the discharging chute 71 through the flow channel a. Simultaneously, be provided with in the bottom of unloading cover 6 and keep off material slope 61, should keep off material slope 61 mainly used and the cooperation of unloading chute 71: when the gear driving mechanism 8 drives the blanking sleeve 6 to move downwards vertically, the slope surface of the material blocking slope 61 gradually approaches the wall of the blanking chute 71, the gap between the two gradually decreases, which is equivalent to the narrowing of the flow channel a, so that the material flow is reduced; when the gear driving mechanism 8 drives the blanking sleeve 6 to rise vertically, the slope surface of the material blocking slope 61 is gradually far away from the groove wall of the blanking chute 71, the gap between the material blocking slope and the blanking chute is gradually increased, which is equivalent to the widening of the flow channel a, so that the material flow is improved.

So, the adjustable extrusion die head that this embodiment provided, through gear drive with power transmission to unloading cover 6 of gear drive 8, drive unloading cover 6 and carry out vertical elevating movement in the pipe to in-process that unloading cover 6 carries out elevating movement, the synchronous clearance that changes the fender material slope 61 of unloading cover 6 and the unloading chute 71 of outer die sleeve 7, and then the volume size of synchronous change runner a realizes the flow control of melting material in pipe runner a.

In an alternative embodiment with respect to the gear drive mechanism 8, the gear drive mechanism 8 mainly includes a rotating shaft 81, a drive gear 82, and a driven gear 83. The rotating shaft 81 is disposed on the main mold body 3, and is generally vertically disposed on the top end surface of the main mold body 3, and maintains the degree of freedom of the rotational movement. The driving gear 82 is sleeved on the rotating shaft 81 and keeps synchronous rotation with the rotating shaft 81. The driven gear 83 is sleeved on the top of the blanking sleeve 6 and forms meshing transmission with the driving gear 82. Meanwhile, the inner circular surface of the driven gear 83 is provided with an internal thread, and the outer wall of the top of the blanking sleeve 6 is provided with an external thread, and the internal thread and the external thread are in threaded transmission connection. So set up, when drive unit drive pivot 81 rotated, driving gear 82 carried out synchronous revolution, and then driven gear 83 carries out the meshing rotation, driven gear 83 again through with the screw drive at unloading cover 6 top, turn into the linear motion of unloading cover 6 with rotary motion, drive unloading cover 6 promptly and carry out elevating movement along the vertical. The vertical elevating movement of unloading cover 6 is realized through gear drive's mode to this embodiment, and the vertical displacement volume of unloading cover 6 can accurate control through carrying out accurate control to the motion state (for example rotation angle, rotation rate etc.) of driving gear 82 during, and then the accurate control keeps off the clearance of material slope 61 and unloading chute 71, finally realizes the accurate regulation of the flow of melting material.

Further, in order to ensure stable thread transmission between the driven gear 83 and the blanking sleeve 6, a gear mounting seat 84 is additionally arranged in the embodiment. Specifically, this gear mount 84 sets up the top position at last die sleeve 4, mainly used location installation driven gear 83 to guarantee that driven gear 83 has rotatory motion freedom in gear mount 84, nevertheless restrict driven gear 83's vertical motion freedom simultaneously, prevent that driven gear 83 from producing along vertical direction's linear motion on unloading cover 6.

Furthermore, in order to improve the structural stability, the supporting column 85 and the cover pressing plate 86 are additionally arranged in the embodiment. The supporting pillars 85 are erected on the top end face of the main mold body 3, have a certain height, and are generally distributed on the top end face of the main mold body 3 opposite to the rotating shaft 81. The cover pressing plate 86 covers and presses the top end of the supporting column 85, and the top end of the rotating shaft 81 is inserted into the bottom surface of the cover pressing plate 86, so that the rotating shaft 81 is stably installed; meanwhile, the top end of the gear mounting seat 84 abuts against the bottom surface of the cover pressing plate 86, and stable mounting of the gear mounting seat 84 is achieved. Accordingly, a through hole is formed in the middle region of the cover pressing plate 86 so that the top end of the mandrel 9 can pass through, and the wall thickness adjusting mechanism 10 and the like can be disposed on the top end face of the cover pressing plate 86.

The utility model provides an in another kind of embodiment, still be provided with dabber 9 in main die body 3, this dabber 9 can insert vertically with sliding and establish in unloading cover 6 to the top of dabber 9 extends to the top end of main die body 3 outward always, and the bottom of dabber 9 extends to the bottom end of main die body 3 outward always, mainly used and outer die sleeve 7 cooperation, adjust with the wall thickness of the bottle base of realization extrusion formation to the material. Specifically, an adjusting cone 91 is arranged at the bottom end of the mandrel 9, the adjusting cone 91 is conical or trumpet-shaped, the discharge cone groove 72 is formed at the bottom end of the outer die sleeve 7, a certain gap is reserved between the outer wall surface of the adjusting cone 91 and the inner wall surface of the discharge cone groove 72, and the width of the gap is the wall thickness of the bottle blank. In order to adjust the wall thickness, the mandrel 9 needs to perform vertical lifting movement to adjust the gap between the outer wall surface of the adjusting cone 91 and the inner wall surface of the discharging cone groove 72, and the adjusting principle is similar to the flow adjusting.

Meanwhile, considering that the wall thickness adjustment of the extrusion die head in the prior art is mainly realized through actuating mechanisms such as a servo proportional valve control oil cylinder, if the oil cylinder leaks oil or the proportional valve fails, the wall thickness adjustment is easy to be extremely unstable, so that the wall thickness adjustment mode of the extrusion die head in the prior art is not reliable or has certain limitation, and aiming at the problem, the wall thickness adjusting mechanism 10 is additionally arranged in the embodiment.

Specifically, the wall thickness adjusting mechanism 10 mainly includes a transmission nut 101, and the transmission nut 101 is provided on the top end face of the main mold 3 (or the cover pressing plate 86), while a thread is provided on the top outer wall of the mandrel 9 to form the top of the mandrel 9 into the lead screw 92, and the transmission nut 101 and the lead screw 92 form a thread transmission. With such an arrangement, the rotation of the transmission nut 101 can be converted into the linear motion of the lead screw 92 through the screw transmission by screwing the transmission nut 101, so as to drive the mandrel 9 to perform vertical lifting motion.

Further, in order to ensure stable thread transmission between the transmission nut 101 and the screw rod 92, a nut mounting seat 102 is additionally arranged in the embodiment. Specifically, the nut mounting seat 102 is disposed on the top end face of the main mold body 3 (or the cover pressing plate 86), and is mainly used for positioning and mounting the transmission nut 101, so as to ensure that the transmission nut 101 has a rotational freedom degree in the nut mounting seat 102, but limit the vertical freedom degree of the transmission nut 101, and prevent the transmission nut 101 from generating linear motion along the vertical direction on the screw rod 92.

In addition, the top end of the mandrel 9 is provided with an air inlet 93, and in order to facilitate the blow molding of the bottle blank, an air inlet joint 11 is connected to the air inlet 93 so as to introduce compressed air. Meanwhile, an air outlet 94 is formed at the bottom end of the adjusting cone 91, and the air outlet 94 is communicated with the air inlet 93 through the inner cavity of the mandrel 9 so as to enable compressed air to enter the bottle blank.

Furthermore, in this embodiment, an adjusting screw 12 is inserted into the outer die case 7. Specifically, a plurality of adjusting screws 12 are simultaneously arranged on the outer die sleeve 7, and each adjusting screw 12 is distributed along the circumferential direction of the outer die sleeve 7 and is inserted on the outer circular surface of the outer die sleeve 7 along the radial direction, and is mainly used for adjusting the thickness of each different angle position of the outer die sleeve 7 in the circumferential direction in a rotating and abutting manner, so as to ensure that each bottle blank is kept consistent front and back.

The embodiment also provides an extruder, which mainly comprises a machine body 1 and an adjustable extrusion die head connected with the machine body 1, wherein the specific content of the adjustable extrusion die head is the same as the related content, and the details are not repeated here.

The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims (10)

1. The utility model provides an adjustable extrusion die head, its characterized in that, include with feeding seat (2) of fuselage (1) intercommunication, with main die body (3) of feeding seat (2) intercommunication, insert locate last die sleeve (4) of main die body (3) inside top, insert and locate lower die sleeve (5) of main die body (3) inside below, insert and locate go up unloading cover (6) in die sleeve (4), connect in outer die sleeve (7) of main die body (3) bottom, and set up in on main die body (3), be used for driving through gear drive unloading cover (6) carry out vertical elevating movement's gear drive mechanism (8), the outer wall of unloading cover (6) with leave the gap as runner (a) between the inner wall of lower die sleeve (5), the top of outer die sleeve (7) seted up with unloading chute (71) that runner (a) communicate, the bottom of unloading cover (6) be provided with the chute (61) that keeps off material (71) complex, with when the slope is adjusted the unloading chute (61) and is kept off the material the clearance.

2. The adjustable extrusion die head according to claim 1, wherein the gear driving mechanism (8) comprises a rotating shaft (81) vertically arranged at the top end of the main die body (3), a driving gear (82) rotatably sleeved on the rotating shaft (81), and a driven gear (83) rotatably sleeved on the top of the blanking sleeve (6), the driving gear (82) is in meshing transmission with the driven gear (83), and the inner circular surface of the driven gear (83) forms a threaded transmission with the outer wall of the top of the blanking sleeve (6).

3. The adjustable extrusion die head according to claim 2, wherein the gear driving mechanism (8) further comprises a gear mounting seat (84) arranged at the top end of the upper die sleeve (4) for positioning and mounting the driven gear (83) so as to limit the freedom of vertical movement of the driven gear (83).

4. The adjustable extrusion die head according to claim 3, wherein the gear driving mechanism (8) further comprises a supporting column (85) erected at the top end of the main die body (3), and a cover pressing plate (86) covered on the supporting column (85), the top end of the rotating shaft (81) is inserted into the bottom surface of the cover pressing plate (86), and the top end of the gear mounting seat (84) abuts against the bottom surface of the cover pressing plate (86).

5. The adjustable extrusion die head according to any one of claims 1 to 4, further comprising a mandrel (9) vertically slidably inserted into the blanking sleeve (6), and a wall thickness adjusting mechanism (10) disposed on the main die body (3) and used for driving the mandrel (9) to perform vertical lifting movement, wherein an adjusting cone (91) is disposed at the bottom end of the mandrel (9), and a discharging cone groove (72) used for being matched with the adjusting cone (91) is disposed at the bottom end of the outer die sleeve (7), so as to adjust a gap between the adjusting cone (91) and the discharging cone groove (72) when the mandrel (9) performs lifting movement.

6. The adjustable extrusion die according to claim 5, characterized in that the top outer wall of the mandrel (9) is provided with threads and forms a screw mandrel (92), and the wall thickness adjusting mechanism (10) comprises a transmission nut (101) rotatably arranged at the top end of the main die body (3) and forms a thread transmission with the screw mandrel (92).

7. The adjustable extrusion die head according to claim 6, wherein the wall thickness adjusting mechanism (10) further comprises a nut mounting seat (102) arranged at the top end of the main die body (3) for positioning and mounting the transmission nut (101) so as to limit the freedom of vertical movement of the transmission nut (101).

8. The adjustable extrusion die head according to claim 5, further comprising an air inlet joint (11) communicated with an air inlet (93) at the top end of the mandrel (9), wherein an air outlet (94) is formed at the bottom end of the adjusting cone (91), and the air outlet (94) is communicated with the air inlet (93).

9. The adjustable extrusion die according to claim 1, further comprising a plurality of adjusting screws (12) inserted at an outer edge of the outer die sleeve (7) in a radial direction thereof for adjusting a thickness of the outer die sleeve (7) in a circumferential direction.

10. An extruder comprising a body (1) and an adjustable extrusion die connected to the body (1), characterized in that the adjustable extrusion die is in particular an adjustable extrusion die according to any of claims 1-9.

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