Cooling device for PPR pipe production

Abstract

The utility model relates to the field of PPR pipe cooling, and particularly discloses a PPR pipe production cooling device which comprises a machine body and a cooling box installed on the machine body. An air cooling box is arranged at the end, facing the pipe conveying direction, of the cooling box, holes for pipes to penetrate through are formed in the two ends of the air cooling box, the air cooling box is provided with an air pipe externally connected with an air source, a plurality of ventilation holes are formed in the air cooling box, and sealing pieces used for sealing gaps between the walls of the holes and the pipes are arranged on the air cooling box. The PPR pipe has the advantages that stress caused by sudden cooling of the high-temperature pipe during production cooling of the PPR pipe is reduced, the strength of the PPR pipe is enhanced, and the service life of the pipe is prolonged.

Description

Technical Field

[0001] This application relates to the field of cooling technology in pipe production, and in particular to a cooling device for PPR pipe production. Background Technology

[0002] The PPR pipe cooling device is a special equipment used for rapid cooling and shaping during the production of PPR (random copolymer polypropylene) pipes. Its core function is to rapidly solidify the molten pipes extruded at high temperatures through physical cooling methods, ensuring the geometric accuracy, mechanical properties and surface quality of the pipes.

[0003] After PPR pipes are extruded, the common cooling methods are spray cooling or immersion cooling. Because the pipes are at a high temperature and have low strength when they are freshly extruded, the sudden cooling will cause them to shrink, which will increase the stress on the pipes and make them more brittle. The more brittle the pipes are more easily damaged during use, resulting in a shorter service life and failing to meet the requirements of pipe use.

[0004] Regarding the existing related technologies, the inventors believe that there are the following defects: Direct water cooling of PPR pipes at high temperatures can easily lead to increased stress, increased brittleness, and shortened service life. Utility Model Content

[0005] In order to improve the situation where direct water cooling in PPR pipe production easily leads to increased brittleness of the pipe, this application provides a cooling device for PPR pipe production.

[0006] The PPR pipe production cooling device provided in this application adopts the following technical solution:

[0007] A PPR pipe production cooling device includes a body and a cooling box installed on the body, characterized in that: an air-cooled box is provided at one end of the cooling box facing the pipe conveying direction, both ends of the air-cooled box are provided with holes through which the pipe passes, the air-cooled box is provided with an air duct for connecting an external air source, the air-cooled box has multiple ventilation holes, and the air-cooled box is provided with a sealing element for sealing the gap between the hole wall and the pipe.

[0008] By adopting the above technical solution, after the PPR pipe is extruded, the pipe first enters the air-cooling box. At this time, the air duct performs a suction operation. Due to the sealing effect of the seal, the airflow mainly enters the air-cooling box through the vent and acts on the pipe for initial cooling. After air cooling, the pipe enters the cooling box, where the cooling water in the cooling box further cools the pipe. This avoids direct contact between the pipe and the cold water when the pipe is at a high extrusion temperature, which can reduce the stress generated during pipe cooling, improve the brittleness of the pipe, and extend the service life of the pipe.

[0009] Optionally, sealing rollers are provided on both sides of the hole, and the peripheral wall of the pipe is in contact with the sealing rollers.

[0010] By adopting the above technical solution, the pipe enters the air-cooled box for air cooling after passing through the sealing roller. The sealing roller is in close contact with the pipe, which helps to improve the airtightness of the air-cooled box except for the vent, so that the external airflow mainly enters through the vent, thereby improving the cooling effect of the air-cooled box.

[0011] Optionally, the seal is a copper ring adapted to the hole.

[0012] By adopting the above technical solution, when the air-cooled box cools the pipes, the sealing element at the hole position is sealed with a copper ring, which helps to improve the air-cooled box's sealing performance and air-cooling effect. Using a copper ring can also extend the service life of the sealing element.

[0013] Optionally, the ventilation hole is located on the opposite side of the air duct.

[0014] By adopting the above technical solution, the ventilation holes are located on the opposite side of the air duct, so that the cooling air blows from one side of the pipe to the other side. The cooling airflow continuously wraps around the pipe, effectively increasing the heat exchange area between the pipe and the cooling airflow and improving the cooling uniformity of the pipe.

[0015] Optionally, a drying box is provided on the side of the cooling box away from the air-cooled box. The drying box has perforations on both sides for pipes to pass through, and multiple drying pipes connected to the air ducts are provided inside the drying box.

[0016] By adopting the above technical solution, the drying box is connected to the air-cooled box through the air duct. The airflow drawn in by the air duct exchanges heat with the pipes in the air-cooled box and forms warm air that enters the drying box. It is then blown onto the pipes that have been cooled by the cooling box through the drying pipe to dry the pipes. The generated warm air is effectively utilized, improving energy efficiency, saving energy consumption, and facilitating the further processing of PPR pipes.

[0017] Optionally, the walls of the perforations are provided with sponge.

[0018] By adopting the above technical solution, the walls of the drying box and cooling box are equipped with sponges, which can effectively wipe away water stains on the pipes after they have been soaked in the cooling box. This allows the pipes to undergo preliminary dehydration and drying after being cooled in the cooling box, which is beneficial for the next step of processing.

[0019] Optionally, the bottom of the drying chamber is funnel-shaped, and a water outlet is provided at the lowest point of the drying chamber.

[0020] By adopting the above technical solution, the inside of the drying box is funnel-shaped. When the drying tube inside the drying box blows air to dry the pipes, the blown water is collected at the bottom of the drying box along the inner wall of the funnel shape, which is conducive to collecting the water generated during the drying of the pipes and discharging it in time. The funnel shape of the drying box reduces the internal space of the drying box, which is conducive to the accumulation of heat inside the drying box, increasing the internal temperature of the drying box, and further improving the drying efficiency of the drying box.

[0021] Optionally, the drying tubes are arranged on both sides above the pipe transport direction and perpendicular to the pipe transport direction.

[0022] By adopting the above technical solution, the drying tube is set above the pipe and tilted at 45 degrees perpendicular to the pipe. The drying tube has strip-shaped openings facing the pipe. When the pipe passes through, the drying tube sprays out a high-speed airflow to continuously dry the pipe, which is beneficial for the pipe to enter the next processing step.

[0023] In summary, this application includes at least one of the following beneficial technical effects:

[0024] 1. An air-cooled box is installed facing the direction of pipe transportation in the cooling box. After the pipe is extruded, it is initially cooled in the air-cooled box to reduce the pipe temperature. This avoids the hot pipe directly entering the cooling box for immersion cooling, reduces the stress caused by the sudden cooling of the pipe, enhances the pipe strength, and increases the service life of the pipe.

[0025] 2. The air duct draws in heat from the high-temperature pipes in the air-cooled box, creating a hot airflow that flows into the drying pipes of the drying box. This dries the pipes passing through the drying box. The drying box and the air-cooled box are connected by the air duct. A single fan can be used for initial cooling and drying of the pipes, making full use of the fan. The heat generated during pipe production is also used to dry the pipes through the air duct, allowing for the reuse of heat generated during production. This improves the cooling and drying of pipe production while saving energy. Attached Figure Description

[0026] Figure 1 This is a schematic diagram of the overall structure of Embodiment 1 of this application;

[0027] Figure 2 yes Figure 1 Schematic diagram of the cross-sectional structure along line AA;

[0028] Figure 3 This is a cross-sectional schematic diagram of the copper ring, air-cooled box, vent, pipe, hole, and tubing used in Embodiment 2 of this application.

[0029] Reference numerals: 1. Body; 2. Cooling box; 3. Air-cooled box; 4. Drying box; 5. Air duct; 6. Ventilation hole; 7. Hole; 8. Sealing roller; 9. Perforation; 10. Sponge; 11. Drying tube; 12. Pipe; 13. Copper ring. Detailed Implementation

[0030] The following is in conjunction with the appendix Figure 1-3 This application will be described in further detail. Example 1

[0031] This application discloses a cooling device for PPR pipe production. (Refer to...) Figure 1 and Figure 2 The PPR pipe production cooling device includes a body 1, a cooling box 2 mounted on the body 1, a cooling box 3 fixedly connected to the cooling box 2 facing the conveying direction of the pipe 12, holes 7 for conveying pipes opened at both ends of the cooling box 3, an air duct 5 for connecting to an external air source installed inside the cooling box 3, a vent hole opened on the opposite side of the air duct 5, and an external fan connected to the air duct 5 to provide an air source, a drying box 4 fixedly connected to the side of the cooling box 2 away from the cooling box 3, a drying pipe 11 installed inside the drying box 4, the drying pipe 11 being connected to the air duct 5, and holes 7 for pipes to pass through opened on both sides of the drying box 4.

[0032] When the extruded pipe 12 enters the air-cooling box 3, the air duct 5 connected to the air-cooling box 3 performs a suction operation to initially cool the pipe 12. The pipe 12 then enters the cooling box 2 through the air-cooling box 3 for further cooling by immersion in cold water. When the pipe 12 enters the drying box 4 after being cooled by the cooling box 2, the drying pipe 11 in the drying box 4 blows air to dry the pipe 12. The initial air cooling of the extruded pipe 12 in the air-cooling box 3 pre-cools the pipe 12, preventing the high-temperature pipe 12 from directly contacting the cold water for cooling. This avoids excessive stress caused by sudden temperature changes in the pipe 12, which could lead to increased brittleness and a shorter service life.

[0033] refer to Figure 2 The air-cooled box 3 is rotatably connected to the sealing rollers 8 at the hole 7 and on both sides of the tube 12. The periphery of the tube 12 is in contact with the sealing rollers 8, and the sealing rollers 8 are also in close contact with the hole 7.

[0034] When the extruded PPR pipe enters the air-cooled box 3, the sealing roller 8 can improve the sealing performance of the air-cooled box 3 except for the ventilation hole 6, and at the same time reduce the friction on the pipe 12. When the pipe 12 enters the air-cooled box 3 and the air duct 5 starts to perform suction, airflow is formed inside the air-cooled box 3, which reduces the temperature of the pipe 12, reduces the stress generated on the pipe 12, and reduces the brittleness of the pipe 12.

[0035] refer to Figure 2The drying chamber 4 has perforations 9 on both sides for transporting the pipes 12. Sponges 10 are fixed to the walls of the perforations 9. A drying pipe 11 is installed inside the drying chamber 4 and is connected to the air duct 5. The drying pipe 11 is positioned above the pipes 12, perpendicular to the pipes 12 and inclined at 45 degrees. The drying pipe 11 has elongated slots facing the direction in which the pipes 12 pass. Several drying pipes 11 are arranged side-by-side at 20cm intervals on both sides of the direction in which the pipes 12 pass.

[0036] After being cooled in the cooling box 2, the pipes undergo initial drying by using a sponge 10 or a rubber scraper. Inside the drying box 4, the drying pipes 11 further dry the pipes with blowing air, facilitating further processing of the pipes 12. The pipes 12 enter the drying box, where the parallel drying pipes 11 spray high-speed airflow to continuously dry any remaining moisture. The inclined angle of the drying pipes 11 ensures that the airflow blows downwards onto the pipes 12, making it easier for moisture to fall off and improving the drying efficiency.

[0037] refer to Figure 2 The air-cooled box 3 has multiple ventilation holes 6 on the opposite side of the connecting air duct 5. The ventilation holes 6 are round holes with a diameter of 2cm and a spacing of 1cm. The ventilation holes are located on the opposite side of the air duct 5, which is conducive to the rapid intake of external airflow into the air-cooled box 3 by the air duct 5, avoiding the accumulation of heat in the air-cooled box 3, and making the cooling airflow evenly wrap around the pipe 12, so as to achieve the effect of uniform cooling of the pipe 12.

[0038] refer to Figure 2 The bottom of the drying box 4 is funnel-shaped, and a water outlet is provided at the lowest point of the drying box 4.

[0039] When the drying tube 11 inside the drying oven 4 dries the water that passes through the tube 12, the water stains formed can collect along the funnel-shaped interior to the bottom of the drying oven 4. The funnel-shaped space reduces the volume of the drying oven 4, which is conducive to the collection of internal temperature, increases the temperature of the drying oven 4, and further improves the drying effect of the drying oven 4. Example 2

[0040] refer to Figure 2 and Figure 3 The difference between this embodiment and Embodiment 1 is that the sealing element is a copper ring 13 fixed to the wall of the hole 7 and adapted to be inserted into the pipe 12. The copper ring 13 helps to improve the sealing performance of the air-cooled box 3, has a longer service life, and requires less maintenance, while the sealing roller 8 exerts less friction on the pipe 12 during transportation. In other feasible embodiments, the copper ring can also be connected to a circulating heat exchange medium, such as cooling water or heat exchange oil at a certain temperature, to facilitate further staged cooling of the pipe 12.

[0041] The implementation principle of the PPR pipe production cooling device in this application embodiment is as follows: the extruded PPR pipe 12 first enters the air-cooling box 3 for preliminary air cooling to reduce the temperature of the pipe 12. The air-cooling box 3 is equipped with sealing rollers 8 or copper rings 13 to ensure the airtightness of the air-cooling box 3. Then the pipe 12 enters the cooling box 2 for further immersion cooling. After cooling, the pipe 12 enters the drying box 4 for drying. The air-cooling box 3 and the drying box 4 are connected by air ducts 5, making full use of the air ducts 5 to pre-cool and dry the pipe 12. This avoids the problem of the pipe 12 becoming more brittle and reducing its strength due to direct water cooling at high temperature, effectively extending the service life of the pipe 12 and meeting the usage requirements of the pipe 12.

[0042] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A cooling device for PPR pipe production, comprising a body (1) and a cooling box (2) mounted on the body (1), characterized in that: The cooling box (2) is provided with an air-cooled box (3) at one end facing the conveying direction of the pipe (12). Both ends of the air-cooled box (3) are provided with holes (7) through which the pipe (12) passes. The air-cooled box (3) is provided with an air duct (5) for connecting an external air source. The air-cooled box (3) is provided with multiple ventilation holes (6). The air-cooled box (3) is provided with a sealing element for sealing the gap between the hole wall (7) and the pipe (12).

2. The PPR pipe production cooling device according to claim 1, characterized in that: The sealing element is two sealing rollers (8) disposed on the wall of the hole (7) and located on both sides of the pipe (12).

3. The PPR pipe production cooling device according to claim 1, characterized in that: The sealing element is a copper ring (13) that is fixed to the wall of the hole (7) and is compatible with the pipe material.

4. A PPR pipe production cooling device according to claim 1, characterized in that: The ventilation hole (6) is located on the opposite side of the air duct (5).

5. A PPR pipe production cooling device according to claim 1, characterized in that: A drying box (4) is provided on the side of the cooling box (2) away from the air-cooled box (3). The drying box (4) has perforations (9) on both sides for the pipes (12) to pass through. Multiple drying pipes (11) connected to the air duct (5) are provided inside the drying box (4).

6. A PPR pipe production cooling device according to claim 5, characterized in that: The perforated wall (9) is provided with a sponge (10).

7. A PPR pipe production cooling device according to claim 5, characterized in that: The bottom of the drying box (4) is funnel-shaped, and a water outlet is provided at the lowest point of the drying box (4).

8. A PPR pipe production cooling device according to claim 5, characterized in that: The drying tube (11) is located on both sides above the transport direction of the pipe (12) and perpendicular to the transport direction of the pipe (12).

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