PVC pipe cooling and shaping equipment

Abstract

This utility model discloses a PVC pipe cooling and shaping device, including a water cooling device and a traction cooling mechanism. The working end of a linear motor is connected to the side wall of the first end of a connecting pipe, the first end of the connecting pipe is connected to the air outlet of a fan, the air inlet of the fan is connected to a cold air source, and a traction head is installed on the outer wall of the second end of the connecting pipe. A third through hole is axially provided inside the connecting pipe, and the first, second, and third through holes are coaxially arranged. During operation, the traction head pulls the PVC pipe through the second through hole. This utility model cools the outer wall of the PVC pipe with water cooling and the inner wall of the PVC pipe with air cooling, so that the temperature difference between the inner and outer walls of the pipe is small, ensuring the cooling and shaping quality of the PVC pipe. Both air cooling and water cooling are performed by cooling the head end of the PVC pipe first and then the tail end. This design ensures that the temperature difference between the cooling medium and different parts of the PVC pipe is not too large, ensuring linear cooling of the PVC pipe and avoiding cracks caused by sudden temperature drops.

Description

Technical Field

[0001] This utility model relates to the technical field of PVC pipe production equipment, and in particular to a PVC pipe cooling and shaping device. Background Technology

[0002] PVC pipes are made primarily from sanitary-grade polyvinyl chloride (PVC) resin, with the addition of appropriate amounts of stabilizers, lubricants, fillers, and colorants. The process involves extrusion molding using a plastic extruder and injection molding using an injection molding machine. The pipes and fittings are then produced through processes such as cooling, curing, shaping, inspection, and packaging. However, existing cooling and shaping technologies have the following problems:

[0003] 1. In most cases, cooling is achieved by direct water mist or water contact with the outer wall of the formed pipe in a single stage. This cooling method can lead to a large temperature difference between the inner and outer walls of the pipe. Sudden cooling can easily cause internal stress concentration, resulting in microcracks or uneven crystallization (especially in thick-walled pipes).

[0004] Therefore, it is necessary to develop PVC pipe cooling and shaping equipment to solve the above problems. Utility Model Content

[0005] The purpose of this invention is to design a PVC pipe cooling and shaping device to solve the above problems.

[0006] This utility model achieves the above objectives through the following technical solutions:

[0007] PVC pipe cooling and shaping equipment, including:

[0008] Water cooling device; The water cooling device includes a water cooling pipe, multiple water inlets, and multiple water outlets. The multiple water inlets are radially installed on the side wall of the first end of the water cooling pipe, and the multiple water outlets are radially installed on the side wall of the second end of the water cooling pipe. Multiple water passages are provided inside the side wall of the water cooling pipe from the first end to the second end. One end of the water passage is connected to the water inlet, and the other end of the water passage is connected to the water outlet. The second end of the water cooling pipe is located close to the extrusion head of the PVC pipe extruder. A first through hole is axially provided inside the inner membrane head of the extrusion head, and a second through hole is axially provided inside the water cooling pipe. The diameter of the second through hole is slightly larger than the outer diameter of the PVC pipe.

[0009] The traction cooling mechanism includes a linear motor, a connecting pipe, a traction head for clamping the inner wall of the PVC pipe from the inside out, and a fan. The linear motor is fixed in position, and its working end is connected to the first end side wall of the connecting pipe. The first end of the connecting pipe is connected to the air outlet of the fan, and the air inlet of the fan is connected to a cold air source. The traction head is installed on the second end outer wall of the connecting pipe. A third through hole is axially provided inside the connecting pipe. The first, second, and third through holes are coaxially arranged. During operation, the traction head pulls the PVC pipe through the second through hole.

[0010] The beneficial effects of this utility model are as follows:

[0011] Water cooling is used to cool the outer wall of the PVC pipe, while air cooling is used to cool the inner wall of the PVC pipe. This ensures that the temperature difference between the inner and outer walls of the pipe is small, thus guaranteeing the cooling and molding quality of the PVC pipe.

[0012] Both air cooling and water cooling systems cool the PVC pipe head first, then the tail end. This design ensures that the temperature difference between the cooling medium and different parts of the PVC pipe is not too large, guaranteeing linear cooling throughout the PVC pipe and preventing cracks caused by sudden temperature drops. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the structure of this application;

[0014] Figure 2 This is a schematic diagram of the extrusion head in this application (viewpoint 1);

[0015] Figure 3 This is a schematic diagram of the extruder head in this application (viewpoint 2);

[0016] Figure 4 This is a schematic diagram of the water-cooling device in this application;

[0017] Figure 5 This is a schematic diagram of the water passage structure in this application;

[0018] Figure 6 This is a schematic diagram of the guide groove in this application;

[0019] Figure 7 This is a schematic diagram of the traction cooling mechanism in this application;

[0020] Figure 8 This is a schematic diagram of the annular airbag structure in this application;

[0021] Figure 9 This is a schematic diagram of the structure of the annular airbag after inflation in this application;

[0022] Figure 10 This is a schematic diagram of the structure of the ring-shaped airbag in this application after inflation and its mating with the PVC pipe;

[0023] Figure 11 This is a schematic diagram of the working status of this application. Figure 1 ;

[0024] Figure 12 This is a schematic diagram of the working status of this application. Figure 2 .

[0025] Legend: 1-Extruder head, 2-Water cooling device, 3-Guide groove, 4-Traction cooling mechanism, 5-Outer membrane head, 6-Inner membrane head, 7-Feed inlet, 8-High-pressure gas inlet, 9-Outlet, 10-First through hole, 11-Water cooling pipe, 12-Water inlet, 13-Water outlet, 14-Second through hole, 15-Water passage, 16-Connecting pipe, 17-Annular airbag, 18-Inflation eye, 19-PVC pipe, 20-Fan, 21-Air inlet, 22-Air outlet, 23-Horizontal bar, 24-Vertical bar, 25-Slider, 26-Guide rail, 27-Motor, 28-Screw. Detailed Implementation

[0026] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this utility model. The components of the embodiments of this utility model described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0027] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0028] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0029] In the description of this utility model, it should be understood that the terms "upper", "lower", "inner", "outer", "left", "right", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship that the utility model product is usually placed in during use, or the orientation or positional relationship that is commonly understood by those skilled in the art. They are only used to facilitate the description of this utility model and to simplify the description, and are not intended to indicate or imply that the device or component referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0030] Furthermore, the terms "first," "second," etc., are used only to distinguish descriptions and should not be interpreted as indicating or implying relative importance.

[0031] In the description of this utility model, it should also be noted that, unless otherwise explicitly specified and limited, terms such as "set" and "connection" should be interpreted broadly. For example, "connection" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be a connection within two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0032] The specific embodiments of this utility model will now be described in detail with reference to the accompanying drawings.

[0033] like Figure 1 and 2 As shown in Figures 3, 4, and 7, the PVC pipe 19 cooling and shaping equipment includes:

[0034] Water-cooling device 2; Water-cooling device 2 includes a water-cooling pipe 11, multiple inlets 12, and multiple outlets 13. The multiple inlets 12 are radially installed on the side wall of the first end of the water-cooling pipe 11, and the multiple outlets 13 are radially installed on the side wall of the second end of the water-cooling pipe 11. Multiple water passages 15 are provided inside the side wall of the water-cooling pipe 11 from the first end to the second end. One end of the water passage 15 is connected to the inlet 12, and the other end of the water passage 15 is connected to the outlet 13. The second end of the water-cooling pipe 11 is close to the PVC pipe. The extruder 19 has an extrusion head 1 with an axial first through hole 10 inside the inner membrane head 6 and a second through hole 14 inside the water cooling pipe 11. The diameter of the second through hole 14 is slightly larger than the outer diameter of the PVC pipe 19. During operation, the inlet and outlet can be connected to water circulation equipment, such as a heat exchanger or a water storage tank. Cooling water can enter the inlet through a water pump, thus realizing a cooling water circulation system. This system is existing technology, and its structure and working principle will not be further explained here.

[0035] The traction cooling mechanism 4 includes a linear motor 27, a connecting pipe 16, a traction head for clamping the inner wall of the PVC pipe 19 from the inside out, and a fan 20. The linear motor 27 is fixedly positioned, and the working end of the linear motor 27 is connected to the first end side wall of the connecting pipe 16. The first end of the connecting pipe 16 is connected to the air outlet 22 of the fan 20, and the air inlet 21 of the fan 20 is connected to a cold air source. The traction head is installed on the second end outer wall of the connecting pipe 16. A third through hole is axially provided inside the connecting pipe 16. The first through hole 10, the second through hole 14, and the third through hole are coaxially arranged. During operation, the traction head pulls the PVC pipe 19 through the second through hole 14.

[0036] like Figure 5As shown, the water passage 15 is formed in a spiral shape, and multiple water passages 15 are parallel to each other. This structural design ensures a longer contact time between the cooling water and the water-cooled pipe 11, enabling better heat exchange.

[0037] like Figure 4 As shown, multiple water inlets 12 are evenly installed around the centerline of the water-cooling pipe 11, and multiple water outlets 13 are evenly installed around the centerline of the water-cooling pipe 11.

[0038] In existing technologies, when pulling the formed PVC pipe 19, a rigid tube is often directly inserted into the end of the PVC pipe 19 via interference fit before pulling; or a clamp is directly used to hold the outer wall of the end of the PVC pipe 19. Such pulling connection methods can damage the PVC pipe 19, affecting product quality. To solve this problem, such as... Figure 7 and 8 As shown, the traction head of this application is an annular airbag 17, which is installed on the first end side wall of the connecting pipe 16. An inflation hole 18 is provided on the first end of the annular airbag 17 away from the connecting pipe 16. When it is necessary to traction the PVC pipe 19, the annular airbag 17 is partially inserted into the PVC pipe 19, exposing the inflation hole 18. Then, the annular airbag 17 is inflated through the inflation hole 18 until the outer wall of the annular airbag 17 forms support for the inside of the PVC pipe 19, and the friction between the outer wall of the annular airbag 17 and the inner wall of the PVC pipe 19 is sufficient to enable the traction cooling mechanism 4 to pull the PVC pipe 19. Figure 8 The diagram shown is a schematic of the installation structure of the annular airbag 17 on the connecting tube 16. Figure 9 The diagram shown is a schematic of the structure of the annular airbag 17 after it has been inflated. Figure 10 The diagram shown is a schematic of the structure of the annular airbag 17 after expansion and its fit with the inner wall of the PVC pipe 19.

[0039] In some embodiments, the outer wall of the annular airbag 17 is made of a material with a high coefficient of friction in order to increase the friction between the annular airbag 17 and the inner wall of the VC tube.

[0040] like Figure 7As shown, the traction cooling mechanism 4 also includes a horizontal bar 23 and a vertical bar 24. The horizontal bar 23 is perpendicular to the vertical bar 24. The linear motor 27 includes a slider 25, a guide rail 26, a motor 27, a screw 28, and a slider 25. The guide rail 26 and the slider 25 are guided and slidably engaged. The slider 25 has a screw hole. The rotating shaft of the motor 27 is connected to the first end of the screw 28. The screw 28 and the slider 25 are threadedly engaged. The upper end of the slider 25 is connected to the lower end of the vertical bar 24. The upper end of the vertical bar 24 is connected to the first end of the horizontal bar 23. The second end of the horizontal bar 23 is connected to the first end side wall of the connecting pipe 16. The guide rail 26 is parallel to the connecting pipe 16. The working principle of the linear motor 27 is as follows: when the motor 27 is working, the screw 28 rotates. Because the guide rail 26 and the slider 25 are circumferentially limited, and because the screw 28 and the slider 25 are threadedly engaged, the slider 25 slides along the guide rail 26. The sliding of the guide rail 26 moves the vertical rod 24 and the horizontal rod 23, and finally drives the connecting pipe 16 to move.

[0041] like Figure 7 As shown, a rectangular groove is provided inside the guide rail 26, and the slider 25 is formed into a cuboid shape. Figure 1 and 6 As shown, the PVC pipe 19 cooling and shaping device also includes a guide groove 3. The guide groove 3 is located outside the first end of the water cooling device 2. An arc-shaped groove is provided inside the guide groove 3. The diameter of the arc-shaped groove is the same as the diameter of the PVC pipe 19, and the bottom height of the arc-shaped groove is the same as the bottom height of the second through hole 14. It should be noted that because of the arrangement of the horizontal bar 23 and the vertical bar 24, and their positional relationship with the guide groove 3, and because the horizontal bar 23 is connected to the middle of the side wall of the connecting pipe 16, the guide groove 3 does not obstruct the movement of the traction cooling mechanism 4.

[0042] like Figure 2 and 3 The figure shows the extrusion head 1 of a PVC pipe 19 extruder. Except for the first through hole 10 in the inner die head 6, the rest of this structure is existing technology, and its working principle and detailed structure will not be described in detail here. The extrusion head 1 includes an inner die head 6 and an outer die head 5. Both the inner die head 6 and the outer die head 5 are circular cylindrical structures. The inner die head 6 and the outer die head 5 are coaxially arranged and the inner die head 6 is placed inside the outer die head 5. An annular outlet 9 is provided between the outer wall of the inner die head 6 and the inner wall of the outer die head 5. The PVC pipe 19 is extruded from the outlet 9. In addition, the outer die head 5 is also connected to a feed port 7 for injecting the PVC pipe 19 fused material and a high-pressure gas inlet 8 for injecting high-pressure gas.

[0043] Working principle:

[0044] Linear motor 27 operates, pushing connecting pipe 16 through water-cooling pipe 11. At this time, PVC pipe 19 is extruded from outlet 9 and undergoes a certain shaping under air cooling. Then, an annular airbag 17 is inserted into PVC pipe 19, and inflated through air inlet 18 until it expands and connects to the inner wall of PVC pipe 19. Subsequently, PVC pipe 19 continues to be extruded, while linear motor 27 operates in a directional direction, pulling PVC pipe 19. When PVC pipe 19 is pulled into the water-cooling pipe... At time 11, the fan 20 starts working, drawing in cold air through the inlet 21 and blowing it into the connecting pipe 16 through the outlet 22. The air then passes through the inner wall of the PVC pipe 19, cooling its internal structure. The air is then blown out from the first end of the first through-hole 10. Simultaneously, cooling water (or other coolant) is introduced through the water inlet 12. The cooling water moves along the water passage 15 and exchanges heat with the outer wall of the PVC pipe 19 through the water-cooling pipe 11, achieving internal and external cooling of the PVC pipe 19. Finally, the PVC pipe 19 is pulled into the guide groove 3, forming a support to prevent it from bending and sagging under gravity. After the entire PVC pipe 19 is extruded, it is pulled out by the traction cooling mechanism 4 and finally vented through the air inlet 18, allowing the cooled PVC pipe 19 to be removed. In this application, both the cooling water and cold air are cooled at a lower temperature at the head end, and the PVC pipe 19 is cooled at the tail end using preheated cold air and cooling water after heat exchange, thus achieving linear cooling of the PVC pipe 19. Figure 11 As shown, in this state, the annular airbag 17 is inserted into the PVC pipe 19, and after the annular airbag 17 inflates, it connects to the inner wall of the PVC pipe 19; as Figure 12 As shown, in this state, the head of the PVC pipe 19 has been pulled out of the water cooling pipe 11, and the PVC pipe 19 is placed on the guide groove 3.

[0045] The above description is only a preferred embodiment of the present utility model. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the technical principles of the present utility model, and these improvements and modifications should also be considered within the protection scope of the present utility model.

Claims

1. A PVC pipe cooling and setting apparatus, characterized by, include: Water cooling system; The water cooling device includes a water cooling pipe, multiple water inlets, and multiple water outlets. The multiple water inlets are radially installed on the side wall of the first end of the water cooling pipe, and the multiple water outlets are radially installed on the side wall of the second end of the water cooling pipe. Multiple water passages are provided inside the side wall of the water cooling pipe from the first end to the second end. One end of the water passage is connected to the water inlet, and the other end of the water passage is connected to the water outlet. The second end of the water cooling pipe is located close to the extrusion head of the PVC pipe extruder. A first through hole is axially provided inside the inner membrane head of the extrusion head, and a second through hole is axially provided inside the water cooling pipe. The diameter of the second through hole is larger than the outer diameter of the PVC pipe. The traction cooling mechanism includes a linear motor, a connecting pipe, a traction head for clamping the inner wall of the PVC pipe from the inside out, and a fan. The linear motor is fixed in position, and its working end is connected to the first end side wall of the connecting pipe. The first end of the connecting pipe is connected to the air outlet of the fan, and the air inlet of the fan is connected to a cold air source. The traction head is installed on the second end outer wall of the connecting pipe. A third through hole is axially provided inside the connecting pipe. The first, second, and third through holes are coaxially arranged. During operation, the traction head pulls the PVC pipe through the second through hole.

2. The PVC pipe cooling and sizing apparatus of claim 1, wherein, The water passage is spiral-shaped.

3. The PVC pipe cooling and sizing apparatus of claim 1, wherein, Multiple water inlets are evenly installed around the centerline of the water-cooling pipe, and multiple water outlets are evenly installed around the centerline of the water-cooling pipe.

4. The PVC pipe cooling and shaping equipment according to claim 1, characterized in that, The traction head is a ring-shaped airbag, which is installed on the side wall of the first end of the connecting pipe. An inflation hole is provided on the first end of the ring-shaped airbag away from the connecting pipe.

5. The PVC pipe cooling and shaping equipment according to claim 1, characterized in that, The traction cooling mechanism also includes a horizontal bar and a vertical bar. The linear motor includes a slider, a guide rail, a motor, a screw, and a slider. The guide rail and the slider are guided and slidably coupled. The slider has a screw hole. The motor shaft is connected to the first end of the screw. The screw and the slider are threadedly coupled. The upper end of the slider is connected to the lower end of the vertical bar. The upper end of the vertical bar is connected to the first end of the horizontal bar. The second end of the horizontal bar is connected to the first end side wall of the connecting pipe. The guide rail is parallel to the connecting pipe.

6. The PVC pipe cooling and shaping equipment according to claim 5, characterized in that, The guide rail has a rectangular groove, and the slider is shaped like a cuboid.

7. The PVC pipe cooling and shaping equipment according to claim 1, characterized in that, The PVC pipe cooling and shaping equipment also includes a guide groove, which is set outside the first end of the water cooling device. An arc-shaped groove is set inside the guide groove. The diameter of the arc-shaped groove is the same as the diameter of the PVC pipe, and the bottom height of the arc-shaped groove is the same as the bottom height of the second through hole.

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