CN219926852U

CN219926852U - Extrusion coating die

Info

Publication number: CN219926852U
Application number: CN202321242913.5U
Authority: CN
Inventors: 杨多信; 姚东生; 查尚文
Original assignee: Shanghai Yike Polymer Technology Co ltd
Current assignee: Shanghai Yike Polymer Technology Co ltd
Priority date: 2023-05-22
Filing date: 2023-05-22
Publication date: 2023-10-31
Anticipated expiration: 2033-05-22

Abstract

The utility model provides an extrusion coating die which comprises an outer die body, a split die, a neck die, a core rod and a core die, wherein a main runner is formed by inserting a cone part of the split die into a cone-shaped groove of the outer die body, a conical hole is arranged in the neck die, the wide mouth end of the conical hole is matched with the narrow mouth end of the conical groove, the core die is inserted into the conical hole to form a conical runner communicated with the main runner, the main runner and the conical runner have no flat pressure section, the die pressure is effectively reduced, the backflow of a material melt is avoided, the stable production of a pipe is ensured, and the problems that the existing extrusion coating die is large in overload of a machine, high in die pressure, and unstable in the production process of the material melt are solved.

Description

Extrusion coating die

Technical Field

The utility model belongs to the technical field of dies, and particularly relates to an extrusion coating die.

Background

Extrusion molding of cladding tubes is a process of forming a double-layer or multi-layer processed product by coating the outer layer of a tube body with a heated melt of plastic, and is mainly completed by a die. And coating and forming through a mold runner by using the flow pressure of the melt.

When the medical thin-wall braided tube is extruded for cladding, the tube is required to be thin in wall, the die is less in discharging, a straight section exists in a runner formed by the core die and the mouth die, the cross section clearance area of the straight section is small, the pressure of a material melt at the straight section is large, the overload of a machine is large, the die pressure is high, the material melt is reversed, the tube production process is unstable, the appearance is poor and the like.

Disclosure of Invention

The embodiment of the utility model provides an extrusion coating mold, which is characterized in that a main runner is formed by inserting a cone part of a split mold into a cone groove of an outer mold body, a core mold is inserted into a cone hole of a neck mold, a cone runner communicated with the main runner is formed, the main runner and the cone runner have no flat pressure section, the mold pressure is effectively reduced, the reverse flow of a material melt is avoided, the stable production of a pipe is ensured, and the problems that the existing extrusion coating mold, the core mold and the neck mold form the runner with the flat section, the clearance area of the section of the flat section is small, the pressure of the material melt at the flat section is large, the overload of a machine is large, the mold pressure is high, the material melt is reversed, and the pipe production process is unstable are solved.

The embodiment of the utility model provides an extrusion coating die, which comprises an outer die body, a split die, a mouth die, a core rod and a core die;

the two opposite sides of the outer die body are respectively provided with a conical groove and a connecting groove, the narrow mouth end of the conical groove is communicated with the connecting groove, the outer wall of the outer die body is provided with a feeding hole, the feeding hole is communicated with the conical groove, the split die is arranged on the outer die body and is provided with a cone part, the cone part is spliced with the conical groove and is in clearance fit with the conical groove to form a main runner, the split die is provided with a through hole, the mouth die is arranged in the connecting groove, the side of the mouth die facing the split die is provided with a conical hole, the wide-mouth end of the conical hole is matched with the narrow-mouth end of the conical groove, the wide-mouth end of the conical hole faces the split die, the narrow-mouth end of the conical hole penetrates through the side, opposite to the split die, of the split die, the core rod is inserted into the through hole, a first channel is arranged in the core rod, the core rod is connected with the core rod, the core rod is inserted into the conical hole, the core rod and the conical hole are in clearance fit, a conical flow channel communicated with the main flow channel is formed, and a second channel coaxial with the first channel is arranged in the core model.

In one possible implementation, the extrusion coating die further includes a fixed cover plate for fixing the die;

the die comprises a clamped part and an extending part, wherein the clamped part and the extending part are of an integrated structure, the conical hole is formed in the clamped part and the extending part, and the clamped part is spliced with the connecting groove;

the fixed cover plate is provided with an avoidance hole, the fixed cover plate is fixedly arranged on the side, provided with the connecting groove, of the outer die body, the extension portion penetrates through the avoidance hole, and the outer die body and the fixed cover plate clamp the clamped portion so that the die is fixed.

In one possible implementation, the extrusion coating die further comprises a heating assembly comprising a first heating device and a second heating device;

the first heating device is arranged on the outer wall of the outer die body, and the second heating device is arranged on the outer wall of the fixed cover plate.

In one possible implementation, the extrusion coating die further comprises a feed die body;

the outer wall of the outer die body is provided with a mounting position communicated with the feeding hole, the feeding die body is arranged in the mounting position, and the feeding die body is communicated with the feeding hole.

In one possible implementation manner, the outer wall of the cone portion is provided with a spiral groove, the spiral groove surrounds the cone portion, one end of the spiral groove corresponds to the feeding hole, the other end of the spiral groove is located at the small head end of the cone portion, and the spiral groove and the cone groove are combined to encircle a long spiral flow channel.

In a possible implementation manner, the split-flow die further comprises a fixing part, the fixing part and the cone part are of an integrated structure, and the through hole penetrates through the fixing part and the cone part;

the fixing part is fixedly arranged on the side, provided with the conical groove, of the outer die body.

In a possible implementation manner, the mandrel includes a connecting portion and a conical portion, the connecting portion and the conical portion are integrally formed, and the second channel penetrates through the connecting portion and the conical portion;

the connecting part is connected with the core rod, the outer wall of the core rod is connected with a nut, and the nut and the conical part clamp the split die so as to fix the core die and the core rod.

In one possible implementation manner, a first clamping block is arranged on the outer wall of the connecting portion, a second clamping block is arranged on the inner wall of the first channel, the connecting portion is connected with the first channel in an inserting mode, and the first clamping block is connected with the second clamping block in a clamping mode.

According to the extrusion coating die provided by the embodiment of the utility model, the taper part of the split die is spliced with the taper groove of the outer die body to form the main runner, the taper hole is arranged in the die, the wide-mouth end of the taper hole is matched with the narrow-mouth end of the taper groove, the mandrel is spliced in the taper hole to form the taper runner communicated with the main runner, the main runner and the taper runner have no flat pressure section, the die pressure is effectively reduced, the backflow of a material melt is avoided, the stable production of a pipe is ensured, the problems that the existing extrusion coating die is provided with the flat section of the runner formed by the mandrel and the die, the cross-section clearance area of the flat section is small, the pressure of the material melt at the flat section is large, the overload of a machine is large, the die pressure is high, the backflow of the material melt is avoided, and the pipe production process is unstable are solved.

Drawings

FIG. 1 is a schematic view of the structure of an extrusion coating die provided by the present utility model;

FIG. 2 is a schematic view of the outer mold body of FIG. 1;

FIG. 3 is a schematic view of the split die of FIG. 1;

FIG. 4 is a schematic view of the die of FIG. 1;

FIG. 5 is a schematic view of the mandrel and its connection structure of FIG. 1;

fig. 6 is a schematic view of the core mold of fig. 1;

fig. 7 is a schematic view of the structure of the stationary cover plate and the heating assembly of fig. 1.

Reference numerals illustrate:

10-an outer mold body; 20-split-flow die; 30-die; 40-core rod; 50-mandrel; 60-fixing a cover plate; 70-a heating assembly; 80-feeding die body; a 90-nut;

11-a conical groove; 12-connecting grooves; 13-a feed hole; 21-cone section; 22-through holes; 23-helical grooves; 24-fixing part; 31-a tapered hole; 32-clamped part; 33-extension; 41-a first channel; 42-a second clamping block; 51-a second channel; 52-connecting part; 53-conical section; 54-a first fixture block; 61-avoiding holes; 71-a first heating device; 72-a second heating device.

Detailed Description

In order to make the technical solution of the present utility model better understood by those skilled in the art, the technical solution of the present utility model will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present utility model, and it is apparent that the described embodiments are only some embodiments of the present utility model, not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the present utility model without making any inventive effort, shall fall within the scope of the present utility model.

The existing extrusion coating mould has the problems that a straight section exists in a runner formed by a core mould and a neck mould, the cross section clearance area of the straight section is small, the pressure of a material melt at the straight section is large, the mould pressure is high, the material melt is reversed, the pipe production process is unstable and the like.

According to the utility model, the tapered hole 31 is arranged in the die 30, the narrow opening end of the tapered hole 31 penetrates through the side of the die 30, which is opposite to the split die 20, the mandrel 50 is spliced with the tapered hole 31 to form a tapered runner communicated with a main runner, the whole runner formed by the mandrel and the die in the die is tapered, no straight section exists, the die pressure is effectively reduced, material melt backflow is avoided, and stable production of the pipe is ensured.

The specific structure of the extrusion coating die provided by the utility model is described in detail below with reference to the accompanying drawings.

Referring to fig. 1-7, an embodiment of the present utility model provides an extrusion coating die comprising an outer die body 10, a split die 20, a die 30, a mandrel 40, and a mandrel 50;

the whole outer die body 10 can be a cuboid or a cylinder, the left side and the right side of the outer die body 10 are respectively provided with a conical groove 11 and a connecting groove 12, the connecting groove 12 can be a round groove or a square groove, the narrow opening end of the conical groove 11 is communicated with the connecting groove 12, the inner diameter of the narrow opening end is smaller than the inner diameter or the side length of the connecting groove 12, the outer wall of the outer die body 10 is provided with a feeding hole 13, and the feeding hole 13 is communicated with the middle part of the conical groove 11 or near the wide opening end;

the split die 20 is arranged on the outer die body 10, the split die 20 is provided with a cone part 21, the cone part 21 is spliced with the cone groove 11, the cone part 21 and the cone groove 11 are in clearance fit to form a main runner, and the split die 20 is provided with a through hole 22;

the die 30 is arranged in the connecting groove 12, a conical hole 31 is arranged on the side, facing the split-flow die 20, of the die 30, the wide-mouth end of the conical hole 31 is matched with the narrow-mouth end of the conical groove 11, the wide-mouth end of the conical hole 31 faces the split-flow die 20, the narrow-mouth end of the conical hole 31 penetrates through the side, facing away from the split-flow die 20, of the die 30, and the narrow-mouth end size of the conical hole 31 is larger than the outer diameter of an outer braided tube;

the core rod 40 can be a cylinder, the core rod 40 is spliced with the through hole 22, a first channel 41 is arranged in the core rod 40, and the first channel 41 is matched with an external braided tube;

the main body of the core mold 50 is conical, one end of the core mold 50 is connected with the core rod 40, the core mold 50 is inserted into the conical hole 31, the core mold 50 and the conical hole are in clearance fit, a conical flow passage communicated with the main flow passage is formed, a second passage 51 coaxial with the first passage 41 is arranged in the core mold 50, and an external braided tube sequentially penetrates through the first passage 41 and the second passage 51.

According to the extrusion coating mold provided by the embodiment of the utility model, the conical part 21 of the split mold 20 is spliced with the conical groove 11 of the outer mold body 10 to form the main runner, the conical hole 31 is arranged in the die 30, the wide mouth end of the conical hole 31 is matched with the narrow mouth end of the conical groove 11, the core mold 50 is inserted in the conical hole 31 to form the conical runner communicated with the main runner, the main runner and the conical runner have no flat pressure section, the mold pressure is effectively reduced, the reverse flow of a material melt is avoided, the stable production of a pipe is ensured, and the problems that the existing extrusion coating mold has the flat section, the small cross-section clearance area of the flat section, the large pressure of the material melt at the flat section, large overload of a machine, high mold pressure and reverse flow of the material melt and unstable pipe production process are solved.

Referring to fig. 1 and 7, in some embodiments, the extrusion coating die further includes a fixing cover plate 60, and the fixing cover plate 60 may be a metal plate having a certain strength, and the fixing cover plate 60 is used to fix the die 30;

the die 30 comprises a clamped part 32 and an extending part 33, the clamped part 32 can be a circular disc, the extending part 33 can be a circular cylinder, the diameter of the circular disc is larger than that of the circular cylinder, the clamped part 32 and the extending part 33 are of an integrated structure, the conical hole 31 is arranged in the clamped part 32 and the extending part 33, the clamped part 32 is spliced with the connecting groove 12, and the thickness of the clamped part 32 is matched with the depth of the connecting groove 12;

the fixed cover plate 60 is provided with an avoidance hole 61, the avoidance hole 61 is matched with the extension part 33, the fixed cover plate 60 is fixedly arranged on the side of the outer die body 10, which is provided with the connecting groove 12, the extension part 33 penetrates through the avoidance hole 61, and the outer die body 10 and the fixed cover plate 60 clamp the clamped part 32 so as to fix the die 30.

Referring to fig. 1 and 7, in some embodiments, the extrusion coating die further comprises a heating assembly 70, the heating assembly 70 comprising a first heating device 71 and a second heating device 72;

the first heating device 71 is disposed on the outer wall of the outer mold body 10, and the second heating device 72 is disposed on the outer wall of the fixed cover plate 60, thereby ensuring the solution temperature.

Referring to FIG. 1, in some embodiments, the extrusion coating die further comprises a feed die body 80, wherein a feed channel is provided in the feed die body 80;

the outer wall of the outer die body 10 is provided with a mounting position communicated with the feeding hole 13, the feeding die body 80 is arranged in the mounting position, and a feeding channel of the feeding die body 80 is communicated with the feeding hole 13, so that a solution can enter conveniently.

Referring to fig. 1 and 3, in some embodiments, the outer wall of the cone 21 is provided with a spiral groove 23, the spiral groove 23 surrounds the cone 21, one end of the spiral groove 23 corresponds to the feed hole 13, the other end is located at the small end of the cone 21, and the spiral groove 23 and the cone 11 surround a long spiral flow passage, so that the solution can flow conveniently.

In some embodiments, the split-die 20 further includes a fixing portion 24, where the fixing portion 24 is a plate body and is matched with the left side surface of the outer die body 10, the fixing portion 24 and the cone portion 21 are in an integral structure, and the through hole 22 penetrates through the fixing portion 24 and the cone portion 21;

the fixing part 24 is fixedly arranged on the left side surface of the outer die body 10 through screws, so that the outer die body 10 and the split die 20 are stably connected, and the disassembly and the maintenance are convenient.

Referring to fig. 1, 5 and 6, in some embodiments, the core mold 50 includes a connection part 52 and a conical part 53, the connection part 52 may be a circular body, the connection part 52 and the conical part 53 are integrally formed, and the second channel 51 penetrates the connection part 52 and the conical part 53;

the connecting portion 52 is connected to the core rod 40, and a nut 90 is connected to the outer wall of the core rod 40, and the nut 90 and the conical portion 53 clamp the split die 20 to fix the core die 50 and the core rod 40 as the nut 90 is tightened.

In some embodiments, the outer wall of the connecting portion 52 is provided with a plurality of first clamping blocks 54, the plurality of first clamping blocks 54 are respectively connected with the first clamping blocks 42, the inner wall of the first channel 41 is provided with second clamping blocks 42, the gap between every two adjacent first clamping blocks 54 is larger than that between every two adjacent second clamping blocks 42, the gap between every two adjacent second clamping blocks 42 is larger than that between every two adjacent first clamping blocks 54, the connecting portion 52 is spliced with the first channel 41, and the plurality of first clamping blocks 54 are connected with the second clamping blocks 42 in a clamping manner through the gap between every two adjacent second clamping blocks 42, so that the core rod 40 and the core mold 50 are fixed on the split-flow die 20.

According to the technical characteristics, the working principle of the extrusion coating die in the practical application scene is as follows:

when the die is assembled, the split die 20 is inserted into the conical groove 11 of the outer die body 10 and is fixed by a screw to form a main runner, the core rod 40 is inserted into the through hole 22 of the split die 20, the core rod 40 and the core die 50 are connected, the nut 90 is rotated to enable the nut 90 and the core die 50 to clamp and fix the split die 20, the neck die 30 is inserted into the connecting groove 12, the conical part 53 of the core die 50 is inserted into the conical hole 31 of the neck die 30 to form a conical runner communicated with the main runner, and finally the fixed cover plate 60, the heating assembly 70 and the feeding die body 80 are installed;

the whole runner that forms of mandrel and bush in this mould is the toper, does not have straight section, effectively reduces mould pressure, avoids material melt to flow backward, guarantees the stable production of tubular product.

It is to be understood that, based on the several embodiments provided in the present utility model, those skilled in the art may combine, split, reorganize, etc. the embodiments of the present utility model to obtain other embodiments, which all do not exceed the protection scope of the present utility model.

The foregoing detailed description of the embodiments of the present utility model further illustrates the purposes, technical solutions and advantageous effects of the embodiments of the present utility model, and it should be understood that the foregoing is merely a specific implementation of the embodiments of the present utility model, and is not intended to limit the scope of the embodiments of the present utility model, and any modifications, equivalent substitutions, improvements, etc. made on the basis of the technical solutions of the embodiments of the present utility model should be included in the scope of the embodiments of the present utility model.

Claims

1. An extrusion coating die, characterized in that: comprising the following steps:

the device comprises an outer die body (10), wherein conical grooves (11) and connecting grooves (12) are respectively arranged on two opposite sides of the outer die body (10), the narrow opening end of the conical grooves (11) is communicated with the connecting grooves (12), a feeding hole (13) is formed in the outer wall of the outer die body (10), and the feeding hole (13) is communicated with the conical grooves (11);

the split die (20) is arranged on the outer die body (10), the split die (20) is provided with a cone portion (21), the cone portion (21) is inserted into the cone groove (11) and is in clearance fit with the cone groove (11) to form a main runner, and the split die (20) is provided with a through hole (22);

the die (30), the die (30) is arranged in the connecting groove (12), a conical hole (31) is formed in the side, facing the split die (20), of the die (30), the wide-mouth end of the conical hole (31) is matched with the narrow-mouth end of the conical groove (11), the wide-mouth end of the conical hole (31) faces the split die (20), and the narrow-mouth end of the conical hole (31) penetrates through the side, facing away from the split die (20), of the die (30);

the core rod (40) is inserted into the through hole (22), and a first channel (41) is arranged in the core rod (40);

the mandrel (50), mandrel (50) with plug (40) are connected, mandrel (50) with bell mouth (31) are pegged graft mutually, and both clearance fit, form with the toper runner that the sprue is linked together, be equipped with in mandrel (50) with second passageway (51) coaxial with first passageway (41).

2. The extrusion coating die of claim 1, wherein:

the extrusion coating die further comprises a fixed cover plate (60), wherein the fixed cover plate (60) is used for fixing the die (30);

the die (30) comprises a clamped part (32) and an extending part (33), the clamped part (32) and the extending part (33) are of an integrated structure, the conical hole (31) is formed in the clamped part (32) and the extending part (33), and the clamped part (32) is spliced with the connecting groove (12);

the die is characterized in that an avoidance hole (61) is formed in the fixed cover plate (60), the fixed cover plate (60) is fixedly arranged on the side, provided with the connecting groove (12), of the outer die body (10), the extending portion (33) penetrates through the avoidance hole (61), and the outer die body (10) and the fixed cover plate (60) clamp the clamped portion (32) so that the die (30) is fixed.

3. The extrusion coating die of claim 2, wherein:

the extrusion coating die further comprises a heating assembly (70), the heating assembly (70) comprising a first heating device (71) and a second heating device (72);

the first heating device (71) is arranged on the outer wall of the outer die body (10), and the second heating device (72) is arranged on the outer wall of the fixed cover plate (60).

4. The extrusion coating die of claim 1, wherein:

the extrusion coating die further comprises a feed die body (80);

the outer wall of the outer die body (10) is provided with a mounting position communicated with the feeding hole (13), the feeding die body (80) is arranged in the mounting position, and the feeding die body (80) is communicated with the feeding hole (13).

5. The extrusion coating die of claim 1, wherein:

the outer wall of cone portion (21) is equipped with helicla flute (23), helicla flute (23) are around cone portion (21), the one end of helicla flute (23) with feed port (13) are corresponding, and the other end is located the tip of cone portion (21), long spiral runner is encircleed with taper groove (11) to helicla flute (23).

6. The extrusion coating die of claim 1, wherein:

the split die (20) further comprises a fixing part (24), the fixing part (24) and the cone part (21) are of an integrated structure, and the through hole (22) penetrates through the fixing part (24) and the cone part (21);

the fixing part (24) is fixedly arranged on the side, provided with the conical groove (11), of the outer die body (10).

7. The extrusion coating die of claim 1, wherein:

the mandrel (50) comprises a connecting part (52) and a conical part (53), the connecting part (52) and the conical part (53) are of an integral structure, and the second channel (51) penetrates through the connecting part (52) and the conical part (53);

the connecting part (52) is connected with the core rod (40), a nut (90) is connected to the outer wall of the core rod (40), and the split die (20) is clamped by the nut (90) and the conical part (53) so as to fix the core die (50) and the core rod (40).

8. The extrusion coating die of claim 7, wherein:

the outer wall of connecting portion (52) is equipped with first fixture block (54), the inner wall of first passageway (41) is equipped with second fixture block (42), connecting portion (52) with first passageway (41) are pegged graft mutually, first fixture block (54) with second fixture block (42) looks joint.