Special soaking type sizing sleeve for PP-R (polypropylene random copolymer)

Abstract

The utility model discloses a special PP-R (polypropylene random copolymer) soaking type sizing sleeve which comprises a sizing copper sleeve, a fixed flange and a reducing disc, wherein the sizing copper sleeve adopts a seamless copper pipe sleeve as a core component, uniform cooling and sizing are realized through vacuum adsorption holes, and the concentricity is high; the sizing copper sleeve is adaptively connected with the cooling water tank through a fixed flange; the variable-diameter disc adopts a non-uniform distribution proportional disc design principle, consists of square metal sheets with different drift diameters, and is fixed on the two cylindrical metal rods, the drift diameter size is close to the shrinkage of the pipe, and the uniform shrinkage of the pipe is ensured. Different from a traditional disc sizing sleeve, the special PP-R soaking type sizing sleeve is more optimized in design, the effective cooling length is longer, the pipe cooling time is prolonged, the pipe is shrunk uniformly, and the dimensional stability is enhanced. After the soaking sizing sleeve is used, products are uniformly cooled, the surfaces are smooth, the number of unqualified products is reduced, qualified products are improved, comprehensive quality improvement and cost reduction are realized, and the soaking sizing sleeve is suitable for wide-range popularization and application.

Description

Technical Field

[0001] This utility model relates to the field of sizing sleeves for PP-R. Background Technology

[0002] Traditional PP-R sizing sleeves are mostly disc-type sizing sleeves, mainly composed of a water-sealing ring, a water-collecting shroud, and a disc structure. The water-sealing ring is used for cooling the front end of the pipe, while the water-collecting shroud and discs are used for cooling the rear end, ensuring the surface of the pipe entering the vacuum chamber is cured and hardened. Because the water-sealing ring is a very small water ring with a small water flow rate, the pipe blank, fresh from the mold, is at a very high temperature. The molten raw material releases small molecules at high temperatures, which condense at the water-sealing ring upon cooling. Over time, this can cause blockage of the water-sealing ring, resulting in defective products due to uneven cooling. This phenomenon is called "water ring breakage." Because the product quality problems caused by this phenomenon are highly concealed and difficult to detect, they can lead to batch losses and thus pose a quality risk to the product.

[0003] After the tube blank is cooled at the front end, it enters the water collection hood, and the entire tube is immersed in water. Due to the large water flow of this cooling method, the water washes the tube significantly, resulting in a few watermarks on the surface of the tube after it is formed, and the overall appearance is not glossy.

[0004] Because the effective length of the disc section of the disc-type sizing sleeve is relatively short, the pipe is not cooled sufficiently and unevenly, resulting in large fluctuations in pipe quality and a high risk of quality problems.

[0005] Therefore, a new type of sizing sleeve was developed to solve the quality problems of "water ring breakage" and watermarks on the product surface caused by the sealing ring. Summary of the Invention

[0006] The purpose of this utility model is to provide a special immersion-type sizing sleeve for PP-R, to replace the existing disc-type sizing sleeve, to solve the quality problems of "water ring breakage" and watermarks on the product surface, and to improve product quality.

[0007] The technical solution of this utility model is a PP-R special immersion type sizing sleeve, including a cooling water tank, and further including: a sizing copper sleeve, a fixed flange and a reducing disc; wherein the outer shell of the sizing copper sleeve is provided with a water nozzle, which is connected to an external cooling pipeline to cool the front end of the pipe; the inner wall of the sleeve is provided with a vacuum adsorption hole; the sizing copper sleeve is adapted to the cooling water tank through the fixed flange; the reducing disc is completely immersed in the cooling water tank and is composed of square metal plates of different diameters; the reducing disc is non-uniformly arranged and fixed on two cylindrical metal rods.

[0008] Furthermore, starting from the front end of the cooling water tank, the diameter of the square metal plate gradually decreases, making the diameter size close to the shrinkage of the pipe.

[0009] This utility model has the following beneficial effects.

[0010] 1. Unlike traditional disc sizing sleeves, the PP-R dedicated immersion type sizing sleeve has a more optimized design, with a longer effective cooling length, which extends the cooling of the pipe, resulting in more uniform pipe shrinkage and enhanced dimensional stability;

[0011] 2. After using the sizing sleeve of this utility model for soaking, the product cools evenly, the surface is smooth, the number of defective products decreases, and the number of qualified products increases;

[0012] 3. It not only ensures the stability of product production and improves product quality, but also completely solves the quality problems caused by the "water ring breakage" of the sealing ring, achieving comprehensive cost reduction and quality improvement of the product. Attached Figure Description

[0013] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments:

[0014] Figure 1 This is the general drawing of the PP-R special immersion type sizing sleeve of this utility model;

[0015] Figure 2 This is a schematic diagram of a sizing copper bushing structure;

[0016] Figure 3 This is a schematic diagram of a square metal sheet structure;

[0017] Explanation of icon numbers:

[0018] 1-Sizing copper sleeve; 2-Fixed flange; 3-Reducing disc; 4-Vacuum adsorption hole; 5-Cooling water tank; 6-Water nozzle; 7-Cylindrical metal rod; 8-Square metal plate; 9-Vessel diameter. Detailed Implementation

[0019] This utility model provides a mold for a PP-R special immersion type sizing sleeve, including: a sizing copper sleeve 1, a fixed flange 2, and a reducing disc 3.

[0020] The sizing copper sleeve 1 uses a seamless copper tube sleeve as its core component, and achieves uniform cooling and shaping through vacuum adsorption holes 4, resulting in high concentricity. The sizing copper sleeve 1 is adapted to the cooling water tank 5 through a fixed flange 2, and is connected to the external cooling pipeline through a water nozzle 6 for front-end cooling of the pipe.

[0021] The variable diameter disc 3 is completely immersed in the cooling water tank 5. The variable diameter disc adopts the design principle of non-uniformly distributed proportional discs and is composed of eight square metal plates 8 with different diameters. They are fixed on two cylindrical metal rods 7. The diameter size is designed from large to small. The diameter size is close to the shrinkage of the pipe, which ensures uniform shrinkage of the pipe and improves dimensional stability. Due to the uniform cooling of the product, the surface is smoother.

[0022] The working principle is as follows:

[0023] The amorphous tube blank, which is in a high-temperature molten state and is extruded from the extruder, first enters the sizing copper sleeve 1. At the cooling pipe connected to the water nozzle 6, it is uniformly cooled and shaped under the action of the vacuum adsorption hole 2 of the sizing copper sleeve, with high concentricity, and the surface of the tube blank begins to harden initially. After initial cooling and hardening, the tube blank enters the variable diameter disc 3 immersed in the cooling water tank through the fixed flange 2. This structure has the advantage of uniform disc cooling, and at the same time, it will not cause product quality problems such as water washing on the product surface due to excessive water volume. The product appearance quality is smooth, the tube shrinks uniformly, and the product dimensions are stable, thereby improving the product appearance quality.

[0024] The above description is merely a preferred embodiment of the present utility model and is not intended to limit the scope of the present utility model. All equivalent changes and modifications made in accordance with the scope of the present application should be within the technical scope of the present utility model.

Claims

1. A PP-R dedicated immersion type sizing sleeve, comprising a cooling water tank (5), characterized in that, Also includes: Fixed-diameter copper bushing (1), fixed flange (2) and reducing disc (3); The fixed-sizing copper sleeve (1) is equipped with a water nozzle (6) on its outer shell. The external cooling pipeline is connected through the water nozzle (6) to cool the front end of the pipe. The inner wall of the sleeve is equipped with a vacuum adsorption hole (4). The fixed-sizing copper sleeve (1) is adapted to the cooling water tank (5) through the fixed flange (2). The variable-diameter disc (3) is completely immersed in the cooling water tank (5) and is composed of square metal plates (8) with different diameters (9). The variable-diameter disc (3) is non-uniformly arranged and fixed on two cylindrical metal rods (7).

2. The PP-R special soaking type sizing sleeve as described in claim 1, characterized in that, Starting from the front end of the cooling water tank (5), the diameter (9) on the square metal sheet (8) gradually decreases, making the diameter size close to the shrinkage of the pipe.

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