Circulating cooling device for low-polymerization-degree polyvinyl chloride production

Abstract

The utility model discloses a circulating cooling device for low polymerization degree polyvinyl chloride production, which comprises a base and a vertical plate fixed on one side of the top end of the base, a circulating cooling water pipe is fixed in the vertical plate, and an axle box is mounted on the other side of the top end of the base. A bearing pipe concentric with the circulating cooling water pipe is connected to the outer wall of the side, away from the base, of the axle box in a bolted mode, an outer hollow roller is rotationally installed in the bearing pipe, and a rotation driving unit used for driving the outer hollow roller to rotate is installed at the top end of the axle box. According to the utility model, the rolling contact between the outer hollow roller and the polyvinyl chloride coiled material is realized, the purpose of uniformly reducing the heat of the polyvinyl chloride coiled material with the polymerization degree is achieved, and compared with a fixed contact point, the rolling contact can enable the contact area between the outer hollow roller and the polyvinyl chloride coiled material to be larger, so that the efficiency and the uniformity of heat conduction are improved.

Description

Technical Field

[0001] The utility model relates to the technical field of polyvinyl chloride coil processing, in particular to a circulating cooling device for the production of low-polymerization-degree polyvinyl chloride. Background Technique

[0002] The cooling device in the processing of low-polymerization-degree polyvinyl chloride (PVC) coils is a crucial process equipment. Its main function is to effectively control and regulate the temperature of the PVC material to ensure that the coils can meet the expected quality and performance standards during production. The cooling device usually consists of a cooling roll group, a cooling system, and a regulating and controlling system. The cooling roll group is the core component, composed of a guide roll, a cooling roll, and a support roll, made of high-thermal-conductivity materials such as aluminum alloy or stainless steel to ensure that the material can be cooled and solidified evenly and quickly. The cooling system uses a circulating cooling medium, such as water or a specific liquid, to take away heat from inside the cooling roll and effectively reduce the temperature of the PVC material; for example, a cooling mechanism for the production of polyvinyl chloride waterproof coils disclosed in the authorized publication number CN220784598U, a cooling component is installed on the upper part of the cooling box, a winding component is installed at the position corresponding to the cooling component outside the cooling box, the cooling component includes a cooling chamber installed in the middle of the cooling box, a treatment box is installed on the top of the cooling box, a return water pump is connected to the bottom of the cooling box through a pipeline, a water adding pump is connected to the outside of the treatment box through a pipeline, and the liquid inlet end of the water adding pump is connected and installed with a water storage tank through a pipeline, which can make the overall device realize the recycling of water and improve the cooling effect when cooling the waterproof coils. However, in this technical solution, the cooling roll cannot actively roll and contact with the polyvinyl chloride coil, and the contact point between the polyvinyl chloride coil and the cooling roll is always a single point. Due to the limited contact points, the fixed contact point results in better cooling effect around this point than other areas, thus causing uneven temperature distribution on the surface of the coil, easily leading to shape distortion or internal stress of the coil, and further causing defects or uneven texture on the surface of the coil. Summary of the Invention

[0003] The purpose of the utility model is to provide a circulating cooling device for the production of low-polymerization-degree polyvinyl chloride. An outer hollow roll is rotatably installed on the outer surface of the circulating cooling water pipe through a shaft box. The outer hollow roll is used as a transition piece to exchange heat between the circulating cooling water pipe and the polyvinyl chloride coil, and the outer hollow roll is in rolling contact with the polyvinyl chloride coil to solve the problems proposed in the above background technique.

[0004] To achieve the above object, the present utility model provides the following technical solution: A circulating cooling device for the production of low-polymerization-degree polyvinyl chloride, comprising a base and a vertical plate fixed on one side of the top of the base, and a circulating cooling water pipe is fixed inside the vertical plate. On the other side of the top of the base, a shaft box is installed, and a supporting pipe concentric with the circulating cooling water pipe is bolted on the outer wall of the shaft box away from the base. An outer hollow roller is rotatably installed inside the supporting pipe, and a rotary driving unit for driving the outer hollow roller to rotate is installed on the top of the shaft box.

[0005] Preferably, a limiting cylinder concentric with the circulating cooling water pipe is bolted on the outer wall of the other side of the shaft box, and hollow parts are provided at the top and bottom of the limiting cylinder.

[0006] Preferably, the rotary driving unit adopts a reduction motor, and a pair of gear transmission structures for driving the outer hollow roller to rotate self is installed at the output end of the reduction motor.

[0007] Preferably, the outer hollow roller is made of an aluminum alloy material member.

[0008] Preferably, the circulating cooling water pipe includes a straight water pipe fixed inside the vertical plate, and a liquid discharge pipe and a first liquid inlet pipe respectively installed on both sides of the bottom end of the straight water pipe. A second switching valve is installed at one end of the straight water pipe.

[0009] Preferably, the inner diameter of the outer hollow roller is less than or equal to the outer diameter of the straight water pipe, and a ball bearing for assisting the outer hollow roller to rotate self is installed inside the supporting pipe.

[0010] Compared with the prior art, the beneficial effect of the present utility model is that: The circulating cooling device for the production of low-polymerization-degree polyvinyl chloride is provided with structures such as a rotary driving unit and an outer hollow roller that cooperate with each other. The rotary power of the rotary driving unit is transmitted to the outer hollow roller, and the outer hollow roller rotates self and continuously changes the contact point with the low-polymerization-degree polyvinyl chloride coil, that is, realizes rolling contact with the polyvinyl chloride coil, so as to achieve the purpose of evenly reducing the temperature of the low-polymerization-degree polyvinyl chloride coil. Compared with the fixed contact point, the rolling contact can make the contact area between the outer hollow roller and the PVC material larger, thereby increasing the efficiency and uniformity of heat conduction, and enabling the entire surface of the coil to be cooled more evenly. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 is the front view structural schematic diagram of the present utility model;

[0012] Figure 2 is the side view structural schematic diagram of the present utility model;

[0013] Figure 3 is the three-dimensional structural schematic of the present utility model Figure 1 ;

[0014] Figure 4 Schematic three-dimensional structure of the present utility model Figure 2 ;

[0015] Figure 5 Schematic three-dimensional structure of the present utility model Figure 3 。

[0016] In the figure: 1, base; 101, vertical plate; 2, axle box; 201, limiting cylinder; 202, hollowed-out part; 3, supporting pipe; 4, rotary driving unit; 5, circulating cooling water pipe; 501, straight water pipe; 502, drain pipe; 503, first inlet pipe; 504, second switching valve; 6, outer hollow roller. Specific embodiments

[0017] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present utility model. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without creative efforts shall fall within the protection scope of the present utility model.

[0018] Please refer to Figures 1-5 , an embodiment provided by the present utility model: a circulating cooling device for the production of low-polymerization-degree polyvinyl chloride, including a base 1 and a vertical plate 101 fixed on one side of the top of the base 1, and a circulating cooling water pipe 5 is fixed inside the vertical plate 101. On the other side of the top of the base 1, an axle box 2 is installed, and a supporting pipe 3 concentric with the circulating cooling water pipe 5 is bolted to the outer wall of the side of the axle box 2 away from the base 1. An outer hollow roller 6 is rotatably installed inside the supporting pipe 3, and a rotary driving unit 4 for driving the outer hollow roller 6 to rotate is installed at the top of the axle box 2;

[0019] A limiting cylinder 201 concentric with the circulating cooling water pipe 5 is bolted to the outer wall of the other side of the axle box 2, and hollowed-out parts 202 are provided at the top and bottom of the limiting cylinder 201. During the rotation of the outer hollow roller 6, the limiting cylinder 201 and the supporting pipe 3 support the rotation of the outer hollow roller 6 to ensure the stable rotation of the outer hollow roller 6. The rotary driving unit 4 adopts a reduction motor, and a pair of gear transmission structures for driving the outer hollow roller 6 to rotate self is installed at the output end of the reduction motor;

[0020] When the outer hollow roller 6 rotates, the rotary driving unit 4 adopts a reduction motor, and the output end of the reduction motor can drive the outer hollow roller 6 to rotate through a gear transmission structure, a belt transmission structure or a sprocket transmission structure, so that the outer hollow roller 6 is in rolling contact with the coil material. Through the rolling contact, the situation of uneven surface, defects or uneven texture caused by uneven cooling can be avoided;

[0021] The inner diameter of the outer hollow roller 6 is less than or equal to the outer diameter of the straight water pipe 501, and a ball bearing for assisting the outer hollow roller 6 to rotate is installed inside the support pipe 3;

[0022] The outer hollow roller 6 is made of an aluminum alloy member. Aluminum alloy has excellent thermal conductivity, which means that the outer hollow roller 6 can quickly and effectively take away the heat on the surface of the polyvinyl chloride coil from the cooling medium;

[0023] As a transition piece, the outer hollow roller 6 can effectively promote the heat exchange between the circulating cooling water pipe 5 and the polyvinyl chloride coil. When the cooling medium inside the circulating cooling water pipe 5 flows, the heat on the surface of the polyvinyl chloride coil can be taken away through the rolling contact of the outer hollow roller 6;

[0024] The circulating cooling water pipe 5 includes a straight water pipe 501 fixed inside the vertical plate 101 and drain pipes 502 and a first inlet pipe 503 respectively installed on both sides of the bottom end of the straight water pipe 501. A second switch valve 504 is installed at one end of the straight water pipe 501. The staff connects the first inlet pipe 503 and the drain pipe 502 to a water supply pump and a recovery tank respectively, so that cold water continuously enters the straight water pipe 501 through the first inlet pipe 503 and is discharged through the drain pipe 502, so as to achieve the purpose of circulating cold water. The cooling medium flows through the pipeline inside the straight water pipe 501, absorbs heat and takes away the heat on the surfaces of the outer hollow roller 6 and the coil material, thereby quickly reducing the temperature of the PVC material.

[0025] When the embodiment of the present application is in use, first, the staff winds the polyvinyl chloride coil with a certain degree of polymerization to be cooled around the outer hollow roller 6, and connects the polyvinyl chloride coil with a certain degree of polymerization after production to the coiling device. When the coiling device winds the polyvinyl chloride coil with a certain degree of polymerization, the staff connects the water inlet and outlet of the circulating cooling water pipe 5 to an external cold water supply end and a recovery end. At this time, cold water continuously circulates in the circulating cooling water pipe 5 and exchanges heat with the outer hollow roller 6. During the process of cooling and temperature reduction in the circulating cooling water pipe 5, the staff turns on the rotary drive unit 4 to work, then the rotary power of the rotary drive unit 4 is transmitted to the outer hollow roller 6, and the outer hollow roller 6 rotates itself and continuously changes the contact point with the polyvinyl chloride coil with a certain degree of polymerization, that is, it makes rolling contact with the polyvinyl chloride coil, so as to achieve the purpose of evenly reducing the heat of the polyvinyl chloride coil with a certain degree of polymerization. Compared with the fixed contact point, the rolling contact can make the contact area between the outer hollow roller 6 and the PVC material larger, thereby increasing the efficiency and uniformity of heat conduction, enabling the entire surface of the coil to be cooled more evenly, and reducing the temperature gradient, which helps to avoid the generation of surface and internal stresses and improve the dimensional stability of the coil product;

[0026] For those skilled in the art, it is obvious that the present utility model is not limited to the details of the above-mentioned exemplary embodiments, and the present utility model can be implemented in other specific forms without departing from the spirit or basic characteristics of the present utility model. Therefore, from any point of view, the embodiments should be regarded as exemplary and non-restrictive. The scope of the present utility model is defined by the appended claims rather than the above description. Therefore, all changes falling within the meaning and scope of the equivalent elements of the claims are intended to be embraced within the present utility model. Any reference signs in the claims should not be construed as limiting the claims involved.

Claims

1. A circulating cooling device for producing low-polymerization degree polyvinyl chloride, characterized in that: The invention comprises a base (1) and a vertical plate (101) fixed to one side of the top of the base (1), wherein a circulating cooling water pipe (5) is fixed inside the vertical plate (101), an axle box (2) is installed on the other side of the top of the base (1), and a bearing tube (3) concentric with the circulating cooling water pipe (5) is bolted to the outer wall of the axle box (2) on the side away from the base (1), an outer hollow roller (6) is rotatably installed inside the bearing tube (3), and a rotation drive unit (4) for driving the outer hollow roller (6) to rotate is installed on the top of the axle box (2).

2. A circulating cooling device for producing low-polymerization degree polyvinyl chloride according to claim 1, characterized in that: A limiting cylinder (201) which is concentric with the circulating cooling water pipe (5) is bolted to the outer wall on the other side of the axle box (2), and hollow portions (202) are provided at the top and bottom ends of the limiting cylinder (201).

3. A circulating cooling device for producing low-polymerization degree polyvinyl chloride according to claim 1, characterized in that: The rotation drive unit (4) adopts a reduction motor, and the output end of the reduction motor is equipped with a gear transmission structure for driving the outer hollow roller (6) to rotate.

4. A circulating cooling device for producing low-polymerization degree polyvinyl chloride according to claim 1, characterized in that: The outer hollow roller (6) is made of a component made of aluminum alloy.

5. A circulating cooling device for producing low-polymerization degree polyvinyl chloride according to claim 1, characterized in that: The circulating cooling water pipe (5) comprises a straight water pipe (501) fixed inside the vertical plate (101), and a liquid discharge pipe (502) and a first liquid inlet pipe (503) respectively installed on both sides of the bottom end of the straight water pipe (501); a second switch valve (504) is installed at one end of the straight water pipe (501).

6. A circulating cooling device for producing low-polymerization degree polyvinyl chloride according to claim 5, characterized in that: The inner diameter of the outer hollow roller (6) is smaller than or equal to the outer diameter of the straight water pipe (501), and a ball bearing for assisting the outer hollow roller (6) in self-rotation is installed inside the supporting tube (3).

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