Underwater pelletizing die head

Abstract

The utility model discloses an underwater pelletizing die head which is fixedly arranged at the downstream end of an extruder, the die head comprises a die head body, a die cavity is arranged on the die head body, an electric heating device is arranged outside the die head body, a mouth die plate is detachably fixed at the downstream end part of the die head body, and the mouth die plate is arranged on the die cavity. A plurality of mounting holes are formed in the mouth mold plate, a ceramic isolation sleeve is mounted on the mouth mold plate, ceramic inner sleeves embedded into the mounting holes are arranged on the ceramic isolation sleeve, and inner holes of the ceramic inner sleeves form extrusion holes; the underwater pelletizing die head can prevent the extrusion holes from being blocked by carbonization of plastics due to over-high temperature.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of plastic granulation, especially to underwater cutting die head. BACKGROUND

[0002] In the production process of plastic particles, the plastic is heated and melted by the extruder and then extruded for cutting. There are two ways for conveying after cutting, one is underwater cutting, and the other is water tank cutting. The applicant previously applied for a kind of underwater cutting machine with publication number CN116021666A. This underwater cutting machine carries out the cutting process underwater, and the material after cutting directly flows out with the water flow.

[0003] However, when producing some high-flow elastomers, the material is heated and melted by the extruder and then extruded from the die head. The current die head is a metal die head, which is provided with a large number of holes. When the material is heated and melted in the extruder, the material in direct contact with the extruder die head may carbonize and turn black due to the high temperature, and the carbonized and blackened material will adhere to the discharge hole of the die head, causing the discharge hole to be blocked, thereby affecting the efficiency of the die head extrusion. In addition, it needs to be disassembled and cleaned, which is very wasteful of manpower and time, causing downtime SUMMARY

[0004] The technical problem to be solved by the utility model is to provide a kind of underwater cutting die head, which can avoid the blockage of extrusion hole caused by the high temperature of plastic carbonization.

[0005] To solve the above technical problems, the technical scheme of the utility model is as follows: a kind of underwater cutting die head, the die head is fixedly installed at the downstream end of the extruder, the die head includes a die head body, a die cavity is arranged on the die head body, an electric heating device is arranged on the outside of the die head body, characterized in that: the downstream end of the die head body is detachably fixed with a mouth plate, a plurality of mounting holes are arranged on the mouth plate, a ceramic isolation sleeve is installed on the mouth plate, a ceramic inner sleeve embedded in the mounting hole is arranged on the ceramic isolation sleeve, and the inner hole of the ceramic inner sleeve constitutes an extrusion hole.

[0006] As a preferred scheme, the ceramic isolation sleeve includes an isolation plate part, the downstream plate surface of the isolation plate part is provided with the ceramic inner sleeve, and the isolation plate part is attached to the mouth plate and pre-pressed between the die head body and the mouth plate.

[0007] As a preferred scheme, the mounting hole is a conical mounting hole, and correspondingly, the ceramic inner sleeve is also a conical ceramic inner sleeve.

[0008] As a preferred scheme, the die body and the die plate are fixed by bolts and the ceramic isolation gasket is pressed and fixed between the die body and the die plate, and the isolation gasket presses the isolation plate part.

[0009] As a preferred scheme, the die plate comprises a die mounting plate fixed between the die body, the die mounting plate is provided with a die embedding hole in the center, and a die body is embedded in the die embedding hole.

[0010] As a preferred scheme, the die embedding hole is a stepped hole, and the die body is provided with a limiting stepped surface matched with the stepped hole.

[0011] As a preferred scheme, the ceramic isolation sleeve is a split structure, and a plurality of ceramic isolation sleeves are provided, each of which comprises a ceramic inner sleeve, and the upstream end of the ceramic inner sleeve is provided with a flange plate.

[0012] As a preferred scheme, the upstream plate surface of the die plate is further provided with a sink groove matched with the flange plate.

[0013] After the above technical scheme is adopted, the effect of the utility model is that: the underwater cutting die is fixedly installed at the downstream end of the extruder, the die body is provided with a die cavity, the outer part of the die body is provided with an electric heating device, the downstream end of the die body is detachably fixed with a die plate, the die plate is provided with a plurality of mounting holes, the die plate is provided with a ceramic isolation sleeve, the ceramic isolation sleeve is provided with a ceramic inner sleeve embedded in the mounting hole, and the inner hole of the ceramic inner sleeve constitutes an extrusion hole; the ceramic isolation sleeve is a non-metal material, so the heat conductivity is reduced, the influence of temperature on the material in the extrusion hole is reduced, and the extrusion hole is prevented from being blocked due to high temperature carbonization of the plastic.

[0014] In addition, the ceramic isolation sleeve comprises an isolation plate part, the downstream plate surface of the isolation plate part is provided with the ceramic inner sleeve, the isolation plate part is attached to the die plate and is pre-pressed between the die body and the die plate; the die plate and the die body are matched with each other to ensure that the isolation plate part is effectively fixed, so that the ceramic inner sleeve can be installed in the mounting hole accurately and reliably.

[0015] In addition, the mounting hole is a conical mounting hole, and the ceramic inner sleeve is also a conical ceramic inner sleeve; because the pressure of the material during the extrusion process is very large, the conical ceramic inner sleeve matched with the conical mounting hole can ensure that the ceramic inner sleeve is installed accurately during the extrusion of the material, and the stability of the extrusion is ensured.

[0016] And because the die head body and the die plate are further provided with a ceramic isolation gasket, the die head body and the die plate are fixed by bolts and the isolation gasket is pressed and fixed, and the isolation gasket presses the isolation plate part; further temperature control is performed to protect the stability of the temperature during material extrusion.

[0017] And because the die plate includes a die mounting plate, the die mounting plate is fixed between the die head body, the die mounting plate is provided with a die embedding hole in the center, the die body is embedded in the die embedding hole, and the mounting hole is arranged on the die body; this can facilitate the installation and production of the die mounting plate and the die body, thereby facilitating the replacement of the die and reducing the cost.

[0018] And because the die embedding hole is a stepped hole, and the die body is provided with a limiting stepped surface matched with the stepped hole, the stepped hole and the limiting stepped surface cooperate to effectively limit the position of the die body, and ensure that the installation position is firmly and stably installed during material extrusion.

[0019] And because the ceramic isolation sleeve is a split structure, the number of ceramic isolation sleeves is multiple, and each ceramic isolation sleeve includes one ceramic inner sleeve, and the upstream end of the ceramic inner sleeve is provided with a flange plate; the flange plate can increase the contact area with the die plate body, and because the ceramic inner sleeve and the flange plate are pressed on the die body during material extrusion, the discharge stability and reliability can also be ensured, and the single ceramic inner sleeve is convenient to produce.

[0020] And because the upstream plate surface of the die plate is further provided with a sink groove matched with the flange plate; the installation position of the ceramic inner sleeve can be further limited, the installation stability and reliability are further ensured, the side surface of the die body is flush, and the aesthetic appearance is improved. BRIEF DESCRIPTION OF DRAWINGS

[0021] The utility model will be further explained in connection with the drawings and examples.

[0022] Figure 1 is the perspective view of the utility model embodiment;

[0023] Figure 2 is the sectional view of the utility model embodiment;

[0024] Figure 3 is the structure schematic view of one kind of die plate and ceramic inner sleeve of the utility model embodiment;

[0025] Figure 4 is the structure schematic view of another kind of die plate and ceramic inner sleeve of the utility model embodiment;

[0026] Figure 5 is Figure 2 the enlarged view of A place;

[0027] In the attached diagram: 1. Extruder; 2. Die head body; 3. Die cavity; 4. Electric heating device; 5. Die body; 6. Mounting hole; 7. Ceramic inner sleeve; 8. Extrusion orifice; 9. Isolation plate; 10. Isolation gasket; 11. Die mounting plate; 12. Die insert; 13. Limiting step surface; 14. Ceramic isolation sleeve; 15. Flange plate; 16. Settling tank. Detailed Implementation

[0028] The present invention will be further described in detail below through specific embodiments.

[0029] like Figures 1 to 5 As shown, an underwater pelletizing die is fixedly installed at the downstream end of an extruder 1. The die includes a die body 2, a die cavity 3, and an electric heating device 4 on the outside of the die body 2. The die is characterized in that: a die template is detachably fixed at the downstream end of the die body 2, the die template has a plurality of mounting holes 6, a ceramic isolation sleeve 14 is installed on the die template, and a ceramic inner sleeve 7 is provided on the ceramic isolation sleeve 14 and embedded in the mounting holes 6. The inner hole of the ceramic inner sleeve 7 forms an extrusion hole 8.

[0030] like Figure 3 and Figure 5 As shown, the ceramic isolation sleeve 14 includes an isolation plate portion 9, and the ceramic inner sleeve 7 is provided on the downstream plate surface of the isolation plate portion 9. The isolation plate portion 9 is attached to the orifice template and pre-pressed between the die head body 2 and the orifice template. The isolation plate portion 9 is effectively fixed by the cooperation between the orifice template and the die head body 2, so that the ceramic inner sleeve 7 can be placed in the mounting hole 6, and the installation is accurate and reliable.

[0031] Furthermore, the mounting hole 6 is a conical mounting hole 6, and correspondingly, the ceramic inner sleeve 7 is also a conical ceramic inner sleeve 7; since the material is under very high pressure during the extrusion process, the conical ceramic inner sleeve 7 and the conical mounting hole 6 can ensure that the ceramic inner sleeve 7 is accurately installed during extrusion and ensure the stability of the extrusion; the ceramic inner sleeve 7 is made of non-metallic material and does not have good thermal conductivity, which can effectively isolate the heat transmitted from the die head body 2 to the die plate.

[0032] like Figure 2 As shown, a ceramic isolation washer 10 is also provided between the die head body 2 and the orifice template. The die head body 2 and the orifice template are fixed together by bolts, and the isolation washer 10 is pressed and fixed. The isolation washer 10 presses against the isolation plate part 9. Since the temperature on the die head will also affect the material extrusion, the isolation washer 10 is used to further separate the materials, control the temperature, protect the temperature stability during material extrusion, and ensure that the ceramic inner sleeve 7 is installed firmly.

[0033] In this embodiment, the die template includes a die mounting plate 11, which is fixed to the die head body 2. The die mounting plate 11 has a die insert hole 12 at its center, and a die body 5 is embedded in the die insert hole 12. The mounting hole 6 is provided on the die body 5. By embedding the die body 5 into the die insert hole 12, the die mounting plate 11 is fixed to the isolation gasket 10 and the die head body 2, thus completing the installation. This facilitates the installation and production of the die mounting plate 11 and the die body 5, thereby facilitating die replacement and reducing costs.

[0034] Furthermore, the die insert 12 is configured as a stepped hole, and correspondingly, the die body 5 is provided with a limiting step surface 13 that cooperates with the stepped hole; in this way, the step hole and the limiting step surface 13 cooperate to effectively restrict the position of the die body 5, ensuring that the installation position is firmly and stably installed when the material is extruded.

[0035] like Figure 4 As shown, the ceramic isolation sleeve 14 is a split structure, and there are multiple ceramic isolation sleeves 14. Each ceramic isolation sleeve 14 includes a ceramic inner sleeve 7. The upstream end of the ceramic inner sleeve 7 is provided with a flange plate 15. The flange plate 15 can increase the contact area with the die body. Since the ceramic inner sleeve 7 and the flange plate 15 are forced to press against the die body 5 when the material is extruded, the discharge can be ensured to be stable and reliable. In addition, the production of a single ceramic inner sleeve 7 is convenient.

[0036] Furthermore, a recessed groove 16 adapted to the flange plate 15 is provided on the upstream plate surface of the die template; this can further restrict the installation position of the ceramic inner sleeve 7, further ensure stable and reliable installation, and make the side of the die body 5 flush, thus improving aesthetics.

[0037] The above-described embodiments are merely preferred embodiments of the present utility model and are not intended to limit the scope of the present utility model. Any modifications and alterations to the technical solution of the present utility model without departing from its design spirit shall fall within the protection scope defined by the claims of the present utility model.

Claims

1. An underwater slitting die, said die being fixedly mounted to the downstream end of an extruder, said die comprising a die body having a die cavity formed therein, said die body having an electric heating device disposed on the exterior thereof, characterized in that: The downstream end of the die body is detachably fixed with a die plate, the die plate is provided with a plurality of mounting holes, the die plate is installed with a ceramic isolation sleeve, the ceramic isolation sleeve is provided with a ceramic inner sleeve embedded in the mounting hole, and the inner hole of the ceramic inner sleeve constitutes an extrusion hole.

2. An underwater cutting die as claimed in claim 1, wherein: The ceramic isolation sleeve comprises an isolation plate part, the downstream plate surface of the isolation plate part is provided with the ceramic inner sleeve, the isolation plate part is attached to the die plate and is pre-pressed between the die body and the die plate.

3. An underwater cutting die as claimed in claim 2, wherein: The mounting hole is a tapered mounting hole, and correspondingly, the ceramic inner sleeve is also a tapered ceramic inner sleeve.

4. An underwater cutting die as claimed in claim 3, wherein: A ceramic isolation gasket is further arranged between the die body and the die plate, the die body and the die plate are fixed by bolts and the isolation gasket is tightly fixed, and the isolation gasket tightly presses the isolation plate part.

5. An underwater cutting die as claimed in claim 4, wherein: The die plate comprises a die mounting plate, the die mounting plate is fixed between the die body, the center of the die mounting plate is provided with a die embedding hole, the die body is embedded in the die embedding hole, and the mounting hole is arranged on the die body.

6. An underwater cutting die as claimed in claim 5, wherein: The die embedding hole is arranged as a stepped hole, and correspondingly, the die body is provided with a limiting stepped surface matched with the stepped hole.

7. An underwater cutting die as defined in claim 1 wherein: The ceramic isolation sleeve is a split structure, the number of the ceramic isolation sleeves is multiple, each ceramic isolation sleeve comprises one ceramic inner sleeve, and the upstream end of the ceramic inner sleeve is provided with a flange plate.

8. An underwater cutting die as claimed in claim 7, wherein: The upstream plate surface of the die plate is further provided with a sink groove matched with the flange plate.

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