CN204235856U - A kind of double wall heat Heat-Shrinkable Tubings inner glue layer no-mould adjusted tool - Google Patents

Abstract

A double-wall heat-shrinkable tube inner rubber layer adjustment-free mold, comprising a rocket-shaped mandrel, a middle die set on the mandrel, and a die set on the middle die, the mandrel is provided with an inner cavity for compression Air channel, the air inlet end of the mandrel is provided with a circular convex rib for positioning, the outer diameter of the middle part of the mandrel is gradually reduced to form an inclined conical surface, and a tubular air outlet is extended; the outer wall of the mandrel is in contact with the The gap between the inner walls of the middle mold forms a trumpet-shaped inner rubber layer to extrude the cavity. A straight inner rubber layer buffer flow channel is formed between the outer pipe walls at the air end of the mold. During the use of the mold, the probability of the core mold being collided by external force is reduced, and the service life of the mold is long; with a buffer flow channel design, the thickness of the inner rubber layer is uniform during melt co-extrusion, and the concentricity is good, and the extrusion stress of the inner rubber layer is eased to promote The hot melt adhesive flows forward smoothly; the mold debugging time is shortened and the production efficiency is improved.

Description

An adjustment-free mold for the inner rubber layer of a double-wall heat-shrinkable sleeve

technical field

The utility model relates to the field of extrusion molds, in particular to an adjustment-free mold for the inner rubber layer of a double-wall heat-shrinkable sleeve.

Background technique

The heat-shrinkable double-walled sleeve is a high-end product in the heat-shrinkable sleeve. The outer layer is made of high-quality cross-linked polyolefin material, which is a high-strength composite material processed by compounding the inner layer with hot-melt adhesive. The double-wall pipe is formed by melting and co-extruding the outer layer of cross-linked polyolefin material and the inner layer of hot melt adhesive through an extrusion die.

The double-wall pipe extrusion die is mainly composed of a die, a middle die, and a core die. The mold is installed on the production equipment, and each part needs to be installed and debugged separately, and the mold debugging sequence must be from the inside to the outside. The installation and debugging of the traditional double-wall pipe mold consumes a lot of manpower and time, which greatly affects the production efficiency. At present, the thickness of the inner rubber layer of the heat-shrinkable double-walled sleeve is mainly adjusted through the installation gap between the middle mold and the mandrel. The existing general mold does not have a hot-melt adhesive buffer shaping flow channel design, and the inner rubber layer is melted directly. The outer layer of cross-linked polyolefin material is melt-coextruded. Therefore, the adjustment of the gap between the core mold and the middle mold directly affects the uniformity of the inner rubber layer, which is prone to problems such as partial wall of the rubber layer and poor concentricity.

The core mold and the middle mold are easily collided during the separate installation process, which affects the service life of the mold. Moreover, the electroplating material on the surface of the mold is very thin, and various parts of the mold are prone to collisions during storage and use, resulting in stress deformation, and the coating material may be damaged or fall off, resulting in a shortened service life of the mold. Therefore, the installation and adjustment process requires operators to be cautious. On the other hand, the installation of the double-wall core mold and the middle mold is completed at a high temperature of 100°C to 150°C, and there are inevitably potential safety hazards during the installation process. Therefore, installation and The shorter the debugging time, the smaller the potential safety hazard of the operator being burned by high temperature.

Therefore, providing an extrusion die for a heat-shrinkable double-wall sleeve that can ensure the quality of the extruded product and facilitate the installation and debugging of the operator has very positive significance for production.

Utility model content

In order to overcome the deficiencies and existing problems of the prior art, the utility model provides an adjustment-free mold for the inner rubber layer of the double-wall heat shrinkable sleeve, which can not only ensure the quality of the extruded product, but also facilitate the installation and debugging of the operator, and improve the production efficiency.

The utility model is realized through the following technical solutions: a double-wall heat-shrinkable tube inner rubber layer free-adjusting mold, including a rocket-shaped core mold, a middle mold set on the core mold and a mouth mold set on the middle mold , the mandrel is provided with an inner cavity as a compressed air passage, and the air inlet end of the mandrel is provided with a circular convex rib for position limitation. A tubular air outlet; the gap between the outer wall of the mandrel and the inner wall of the middle mold forms a trumpet-shaped inner rubber layer extrusion cavity, and the tail end of the middle mold is provided with a stepped position that is closely connected with the annular rib of the mandrel Snap together, and form a straight inner rubber layer buffer flow channel between the inner wall of the front end of the middle mold and the outer pipe wall of the air outlet end of the mandrel.

Further, the inlet of the inner rubber layer is arranged on the side of the middle mold. Preferably, there are more than two feed ports for the inner rubber layer, which are uniformly arranged on the side of the middle mold.

Further, the inner rubber layer extrusion die cavity includes a straight feed flow channel close to the inner rubber layer feed port, a conical flow channel formed on the inclined conical surface of the mandrel, and the front end of the middle die, which are sequentially connected. The inner rubber layer buffers the flow channel.

Preferably, the tubular air outlet end of the mandrel extends outward from the opening at the front end of the middle die, and cooperates with the mouth die set on the middle die. Form a double-wall co-extruded buffer flow channel.

Further, the inner cavity of the core mold is narrowed in the middle of the core mold, so that the inner diameter of the air inlet end of the compressed air channel is larger than the inner diameter of the air outlet end. The inlet end of the mandrel is connected with the air supply device.

Compared with the prior art, the utility model fixes the core mold and the middle mold together as a whole, the core mold is fixed by the middle mold, the probability of the core mold being collided by external force is reduced during the use of the mold, and the service life of the mold is long; it has buffer flow Road design, the inner rubber layer has uniform thickness and good concentricity during melt co-extrusion, and eases the extrusion stress of the inner rubber layer, and promotes the smooth forward flow of hot melt adhesive. , The two materials are seamlessly bonded together; when the mold is installed, the operator does not need to debug the glue layer and can directly produce, which shortens the mold debugging time, improves production efficiency, and reduces the possibility of the operator being burned by high temperature.

Description of drawings

Fig. 1 is the disassembled state structural representation of mold core and middle mold of the present utility model;

Fig. 2 is the assembling schematic diagram of mold core and middle mold of the present utility model;

In the figure: 1-core mold, 2-middle mold, 3-inner cavity, 4-circular convex rib, 5-cone surface, 6-outlet end, 7-inner rubber layer extrusion cavity, 8-step position, 9-inner rubber layer feed port, 10-feed flow channel, 11-cone flow channel, 12-inner rubber layer buffer flow channel, 13-inner rubber layer discharge port.

Detailed ways

In order to facilitate the understanding of those skilled in the art, the utility model will be further described in detail below in conjunction with the accompanying drawings and specific embodiments. It should be pointed out that the specific embodiments described here are only used to explain the utility model, not to limit the utility model.

As shown in Figures 1 and 2, a double-wall heat-shrinkable sleeve inner rubber layer free adjustment mold includes a rocket-shaped core mold 1, a middle mold 2 set on the core mold, and a mouth mold set on the middle mold . The mandrel is provided with an inner cavity 3 as a compressed air channel, and the air inlet end of the mandrel is provided with a circular convex rib 4 for position limitation, and the air inlet end is connected with the air supply device; The diameter gradually decreases to form an inclined conical surface 5, and a tubular gas outlet end 6 extends out. Preferably, the inner cavity 3 of the core mold is narrowed in the middle of the core mold, so that the inner diameter of the air inlet end of the compressed air channel is larger than the inner diameter of the air outlet end.

The middle mold 2 is set on the core mold 1, and the inner wall contour of the middle mold matches the outer contour of the mandrel, so that the gap between the outer wall of the mandrel mold and the inner wall of the middle mold forms a trumpet-shaped inner rubber layer extrusion cavity 7 . The tail end of the middle mold is provided with a step 8 which is tightly engaged with the annular rib 4 of the mandrel, and the circumferential rib of the mandrel is against the step 8, so that the middle mold and the mandrel are relatively fixed. The middle mold and the core mold are fixed together to form a whole, and the core mold is fixed by the middle mold. After the two are assembled and fixed, the operator does not need to debug the glue layer when the mold is installed, which shortens the mold debugging time and improves production efficiency. During the use of the mold, the probability of the core mold being collided by external force is reduced, the service life of the mold is long, and the core mold is fixed in the middle mold, and the material layer of the mold electroplating material is not easy to fall off.

The feed port 9 for the inner rubber layer is located on the side of the middle mold 2 . Preferably, there are more than two inlets 9 for the inner rubber layer, which are uniformly arranged on the side of the middle mold 2 .

A straight inner rubber layer buffer flow channel 12 is formed between the inner wall of the front end of the middle mold and the outer pipe wall of the air outlet end of the core mold. The buffer channel 12 of the inner rubber layer makes the inner rubber layer uniform in thickness and good in concentricity during the melt co-extrusion process, and the design of the buffer channel of the inner rubber layer eases the extrusion stress of the inner rubber layer and promotes the smooth flow of the hot melt adhesive. Front flow, when the inner rubber layer is co-extruded with the outer skin material, the two materials can form a seamless bond.

Preferably, the tubular air outlet end 6 of the mandrel also extends outward from the opening at the front end of the middle mold (that is, the inner rubber layer outlet 13), and cooperates with the die set on the middle mold. A straight double-wall co-extrusion buffer flow channel is formed between the outer tube wall at the air outlet end of the mandrel and the inner wall of the die, which is used for co-extrusion buffering of the inner rubber layer and the outer skin material, which is conducive to the seamless bonding of the two materials.

The inner rubber layer extrusion cavity 7 includes a straight feed flow channel 10 close to the inner rubber layer feed port, a tapered flow channel 11 formed on the inclined conical surface of the mandrel and an inner rubber at the front end of the middle mold. Layer buffer flow channel 12. The feed flow channel 10, the conical surface flow channel 11, and the inner rubber layer buffer flow channel 12 are sequentially connected. The hot melt adhesive enters the feed channel 10 of the inner rubber layer extrusion cavity 7 through the inner rubber layer feed port 9 on the side of the middle mold 2, flows forward smoothly and then reaches the cone surface flow channel 11. At this time, the inner rubber layer The cross-sectional area of the extrusion cavity 7 decreases gradually, and the flow velocity of the hot melt adhesive increases until it reaches the buffer channel 12 of the inner rubber layer. It is bonded together with the outer leather material. During the extrusion process of the hot melt adhesive, the inner cavity of the mandrel is fed with compressed air through the air supply device at the inlet end, and the compressed air is ejected from the air outlet of the mandrel so that the inner rubber layer can be formed and cooled smoothly.

The contents mentioned in the above embodiments are not limitations of the present utility model, any obvious replacements are within the protection scope of the present utility model without departing from the inventive concept of the present utility model.

Claims (7)

1. a double wall heat Heat-Shrinkable Tubings inner glue layer no-mould adjusted tool, the mouth mould comprising the core (1) in rocket-shaped, be sleeved on the middle mould (2) on core and be sleeved on middle mould, it is characterized in that: described core is provided with inner chamber (3) as compressed air channel, the inlet end of this core is provided with one for spacing hoop fin (4), external diameter in the middle part of core reduces gradually in an inclination conical surface (5), and extends a tubulose outlet side (6); The inner glue layer that gap between described core outer wall and middle mould inwall forms bell mouth shape extrudes die cavity (7), in this, the tail end of mould is provided with step position (8) and closely engages with the hoop fin (4) of core, and forms a straight inner glue layer buffer runner (12) between the inwall of middle mould front end and the outer tube wall of core outlet side.

2. double wall heat Heat-Shrinkable Tubings inner glue layer no-mould adjusted tool according to claim 1, is characterized in that: described inner glue layer charging aperture (9) is located at middle mould (2) side.

3. double wall heat Heat-Shrinkable Tubings inner glue layer no-mould adjusted tool according to claim 2, is characterized in that: described inner glue layer charging aperture (9) number is two or more, is evenly located at middle mould (2) side.

4. the double wall heat Heat-Shrinkable Tubings inner glue layer no-mould adjusted tool according to Claims 2 or 3, is characterized in that: described inner glue layer extrudes the inner glue layer buffer runner (12) that die cavity (7) comprises the straight charging runner (10) of the close inner glue layer charging aperture be communicated with successively, the conical surface runner (11) that the inclination conical surface of core is formed and middle mould front end.

5. double wall heat Heat-Shrinkable Tubings inner glue layer no-mould adjusted tool according to claim 1, it is characterized in that: the outward opening of tubulose outlet side (6) from middle mould (2) front end of described core extends, coordinate with the mouth mould be set on middle mould, between the outer tube wall of this section of overhanging core outlet side and mouth mould inwall, form double-walled co-extrusion buffer runner.

6. double wall heat Heat-Shrinkable Tubings inner glue layer no-mould adjusted tool according to claim 1, is characterized in that: described core inner chamber (3) is narrowed in core medium position, makes the inlet end internal diameter of compressed air channel be greater than outlet side internal diameter.

7. double wall heat Heat-Shrinkable Tubings inner glue layer no-mould adjusted tool according to claim 1, is characterized in that: the inlet end of described core (1) connects with feeder.