Anti-adhesion sizing sleeve

Abstract

The utility model provides an anti-adhesion sizing sleeve, and belongs to the technical field of pipe extrusion equipment. The problem of how to reduce the rejection rate of products while reducing the maintenance cost of a machine is solved. The anti-adhesion sizing sleeve comprises a tubular body, a surface treatment layer formed through sand blasting treatment is arranged on the inner wall of the body in the circumferential direction, the surface treatment layer is made of carborundum materials, and a lubricating layer formed through spraying treatment is arranged on the inner wall of the surface treatment layer in the circumferential direction. And the lubricating layer is made of a polyphenylene sulfide material. According to the anti-adhesion sizing sleeve, the rejection rate of products can be reduced while the maintenance cost of a machine is reduced.

Description

Technical Field

[0001] The utility model belongs to the technical field of pipe extrusion equipment and relates to an anti - adhesion sizing sleeve. Background Art

[0002] In the prior art, PVC pipes are generally produced by an extruder through an extrusion molding method.

[0003] In recent years, according to the implementation of national standards, in order to ensure more environmental protection, lead - containing stabilizers have been gradually prohibited from use, and more environmentally friendly stabilizers such as calcium - zinc stabilizers are used as the base materials when producing PVC pipes.

[0004] However, in the actual manufacturing process, during the cooling and sizing process of raw materials containing calcium - zinc stabilizers, precipitation will occur more or less. This leads to the situation that during the extrusion process, some raw materials will adhere to the inner surface of the sizing sleeve, and during the subsequent production process, the raw materials adhering to the inner surface of the sizing sleeve gradually solidify and harden, and the subsequently extruded PVC pipes will be scratched by them, resulting in an increase in the rejection rate of products. Furthermore, workers need to frequently check and clean the sizing sleeve of the extruder, increasing the maintenance cost in vain. Summary of the Invention

[0005] The purpose of the utility model is to address the above problems existing in the prior art and propose an anti - adhesion sizing sleeve. The technical problem to be solved by the utility model is: how to reduce the rejection rate of products while reducing the machine maintenance cost.

[0006] The purpose of the utility model can be achieved by the following technical solutions: an anti - adhesion sizing sleeve, including a tubular body, characterized in that a surface treatment layer formed by sandblasting is circumferentially provided on the inner wall of the body, and the surface treatment layer is composed of emery material; a lubricating layer formed by spraying is circumferentially provided on the inner wall of the surface treatment layer, and the lubricating layer is composed of polyphenylene sulfide material.

[0007] Compared with the prior art, the anti-adhesion sizing sleeve is different in that: through the setting of the lubricating layer, the strong friction between the inner wall of the sizing sleeve and the extruded product in the prior art is avoided, the situation of raw material precipitation during the extrusion process of the product is reduced, and the rejection rate of the product is lowered. In addition, even if raw material precipitation occurs due to other reasons during the manufacturing process, due to the low friction coefficient of the inner wall of the lubricating layer, the precipitates can be carried out together with the extrusion of the product, thus preventing the precipitates from adhering to the inside of the sizing sleeve and preventing damage to the product formed next time. At the same time, it is not necessary to clean the machine frequently, reducing the machine maintenance cost while reducing the rejection rate of the product. Secondly, it should be noted that the lubricating layer is specifically formed by spraying with polyphenylene sulfide material in the prior art, which has the characteristics of high wear resistance and low friction coefficient. And in addition to the above structure, before spraying to form the lubricating layer, a surface treatment layer made of emery material is formed on the inside of the body by sandblasting. Specifically, the surface treatment layer is formed by first sandblasting 30-80 mesh emery on the inside of the body, then cleaning the body with sodium hydroxide solution (5%), pure water and anhydrous ethanol in sequence, and finally drying it with compressed air. While removing the oxide layer on the inner surface of the surface treatment layer, it ensures that the inner surface roughness of the surface treatment layer is higher, thereby ensuring the adhesion strength between the sprayed and formed lubricating layer and the surface treatment layer.

[0008] In the above-mentioned anti-adhesion sizing sleeve, the thickness of the lubricating layer is between 0.1 mm and 0.5 mm. While ensuring that the lubricating layer has a low friction coefficient, it also ensures the flatness of its inner surface.

[0009] In the above-mentioned anti-adhesion sizing sleeve, the thickness of the surface treatment layer is between 0.05 mm and 0.2 mm. To ensure its bonding strength with the lubricating layer.

[0010] In the above-mentioned anti-adhesion sizing sleeve, the body is made of brass material, and a number of long strip-shaped through holes are provided on the body. It ensures that the heat conductivity of each part of the body is consistent, ensuring the forming quality of the product, and during the manufacturing process, vacuum can be pumped out through each through hole to ensure that the outer wall of the product is completely attached to the inner wall of the lubricating layer, guaranteeing the forming quality of the product.

[0011] In the above-mentioned anti-adhesion sizing sleeve, a number of the through holes are divided into several groups, and several groups of the through holes are arranged at intervals along the circumferential direction of the body, and several through holes in the same group are arranged at intervals along the axial direction of the body. Thus, during the process from the raw material entering the body to the product being extruded, the outer wall of the product can always be attached to the inner wall of the lubricating layer, ensuring the roundness of the extruded product and guaranteeing the forming quality of the product.

[0012] Compared with the prior art, the anti-adhesion sizing sleeve has the following advantages:

[0013] The body is made of brass material to ensure that the heat conduction effects of all parts are consistent. After forming a surface treatment layer on the inner wall of the body by means of sandblasting with emery, a lubricating layer composed of polyphenylene sulfide material is formed on the inner surface of the surface treatment layer by spraying. While ensuring the adhesion strength of the lubricating layer through the surface treatment layer, the low friction coefficient of the inner surface of the lubricating layer avoids the raw materials precipitated during the extrusion molding process of the product from adhering to the inner surface of the lubricating layer, reducing the machine maintenance cost and the rejection rate of the product at the same time. Description of the Drawings

[0014] Figure 1 It is a schematic structural diagram of this anti-adhesion sizing sleeve and its partial enlarged view.

[0015] Figure 2 It is a sectional view of this anti-adhesion sizing sleeve cut along the length direction of the body.

[0016] Figure 3 is Figure 2 The partial enlarged view at position A in

[0017] In the figure, 1 is the body; 11 is the surface treatment layer; 111 is the lubricating layer; 12 is the through hole. Detailed Implementation Modes

[0018] The following are specific embodiments of the present invention and in combination with the drawings, the technical solutions of the present invention are further described, but the present invention is not limited to these embodiments.

[0019] As Figure 1 shown, this anti-adhesion sizing sleeve includes a tubular body 1. The body 1 is made of brass material. A plurality of strip-shaped through holes 12 are provided on the outer wall of the body 1. The plurality of through holes 12 are divided into several groups. The several groups of through holes 12 are arranged at intervals along the circumferential direction of the body 1, and the several through holes 12 in the same group are arranged at intervals along the length direction of the body 1.

[0020] Combined with Figure 2 and Figure 3, on the inner wall of the body 1, there is a surface treatment layer 11 along the circumferential direction. Specifically, it is formed on the inner circumferential wall of the body 1 by means of sandblasting with 30 - 80 mesh emery material. After spraying, the inner surface of the copper sleeve is successively cleaned with sodium hydroxide solution (5%), pure water and anhydrous ethanol, and dried with compressed air. While ensuring that the oxide layer on the inner circumferential surface of the surface treatment layer 11 is removed, the thickness of the surface treatment layer 11 is between 0.05 mm and 0.2 mm, and the inner circumferential surface of the presented surface treatment layer 11 has a certain roughness. In addition, on the inner circumferential surface of the surface treatment layer 11, a lubricating layer 111 with a thickness between 0.1 mm and 0.5 mm is formed by electrostatic powder spraying of polyphenylene sulfide. Polyphenylene sulfide is a prior art and has excellent self-lubricating properties, ensuring that the inner surface of the lubricating layer 111 maintains a low friction coefficient.

[0021] As an alternative solution, the spraying material can also be replaced with polyetheretherketone, polyamide material or ultra-high molecular weight polyethylene material instead of polyphenylene sulfide, and the spraying method can also be replaced with suspension spraying method instead of electrostatic powder spraying method.

[0022] During production operations, after the raw materials enter the sizing sleeve, the extruder sucks vacuum outward through each through-hole 12, so that the outer wall of the formed product fits against the inner wall of the lubricating layer 111. While ensuring the shape of the product, due to the low friction coefficient characteristic of the lubricating layer 111 itself, it effectively avoids the precipitation of raw materials in the formed product and adhesion to the inner surface of the lubricating layer 111.

[0023] The specific embodiments described herein are merely illustrative of the spirit of the present invention. Those skilled in the art to which the present invention pertains can make various modifications or supplements to the described specific embodiments or use similar methods for substitution, but will not deviate from the spirit of the present invention or exceed the scope defined by the appended claims.

[0024] Although terms such as body 1, surface treatment layer 11, lubricating layer 111, through-hole 12, etc. are used more in this article, the possibility of using other terms is not excluded. Using these terms is only to more conveniently describe and explain the essence of the present invention; interpreting them as any additional limitation is contrary to the spirit of the present invention.

Claims

1. An anti-adhesion sizing sleeve, comprising a tubular body (1), characterized in that: The inner wall of the body (1) has a surface treatment layer (11) formed by sandblasting along the circumferential direction, and the surface treatment layer (11) is composed of a corundum material; the inner wall of the surface treatment layer (11) has a lubricating layer (111) formed by spraying along the circumferential direction, and the lubricating layer (111) is composed of a polyphenylene sulfide material.

2. The anti-adhesion sizing sleeve according to claim 1, characterized in that: The lubricating layer (111) has a thickness between 0.1 mm and 0.5 mm.

3. The anti-adhesion sizing sleeve according to claim 1 or 2, characterized in that: The thickness of the surface treatment layer (11) is between 0.05 mm and 0.2 mm.

4. The anti-adhesion sizing sleeve according to claim 3, characterized in that: The main body (1) is made of brass material and is provided with a plurality of long strip-shaped through holes (12).

5. The anti-adhesion sizing sleeve according to claim 4, characterized in that: The plurality of through holes (12) are divided into a plurality of groups, the plurality of groups of through holes (12) are arranged at intervals along the circumference of the body (1), and the plurality of through holes (12) in the same group are arranged at intervals along the axial direction of the body (1).

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