High-quality plastic hose extrusion molding production line

Abstract

This application relates to a high-quality plastic hose extrusion molding production line, comprising a hose extruder, a water cooling mechanism, and a traction mechanism arranged in sequence. The water cooling mechanism includes a water tank, a pallet assembly, and a spray system. A first partition plate and a second partition plate divide the water tank into a first water storage chamber, a second water storage chamber, and a third water storage chamber. One end of the first pallet is located above the first water storage chamber, and the other end extends above the second water storage chamber. The second pallet is located below the first pallet, with one end below the first pallet and above the first water storage chamber, and the other end above the second water storage chamber. Both ends of the third pallet are located above the third water storage chamber. The spray system includes a first spray assembly, a second spray assembly, and a third spray assembly. This application achieves a gradual cooling of the hose from slow to rapid, reducing internal stress caused by the large difference in cooling rates between the inner and outer layers, thereby reducing the risk of damage to the hose strength and improving hose quality.

Description

Technical Field

[0001] This application relates to the field of hose manufacturing technology, and in particular to a high-quality plastic hose extrusion molding production line. Background Technology

[0002] The high-pressure washer connects the spray gun and cleaning fluid via a hose, which plays an indispensable role.

[0003] During hose production, the hose body is extruded using an extruder and then water-cooled for shaping. Typically, the water cooling system consists of a water tank containing water, with the hose moving submerged for cooling. However, in actual use, it has been found that the hose is initially at a high temperature after extrusion. Sudden cooling can cause the outer layer to harden while the inner layer remains very hot, making it difficult for heat to dissipate quickly. This uneven cooling and inconsistent shrinkage can generate significant internal stress. This internal stress can lead to problems such as warping, bending, reduced strength, and cracking, affecting the hose's quality. Summary of the Invention

[0004] To ensure good cooling performance of the hose, this application provides a high-quality plastic hose extrusion molding production line.

[0005] This application provides a high-quality plastic hose extrusion molding production line, which adopts the following technical solution:

[0006] A high-quality plastic hose extrusion molding production line includes a hose extruder, a water cooling mechanism, and a traction mechanism arranged in sequence. The water cooling mechanism includes a water tank, a pallet assembly, and a spray system. The water tank is provided with a first partition plate and a second partition plate, the height of which is lower than the height of the water tank opening. The first and second partition plates divide the water tank into a first water storage chamber, a second water storage chamber, and a third water storage chamber. The pallet assembly includes a first pallet, a second pallet, and a third pallet. The length of the first pallet, the second pallet, and the third pallet extends along the length of the water tank. The first pallet, the second pallet, and the third pallet are concave arc plates, and the lowest point of the arc surface of the first pallet, the second pallet, and the third pallet extends along the length of the water tank.

[0007] One end of the first tray is located above the first water storage chamber, and the other end extends to the top of the second water storage chamber;

[0008] The second tray is located below the first tray, with one end of the second tray located below the first tray and above the first water storage chamber, and the other end located above the second water storage chamber;

[0009] The two ends of the third support plate are located above the third water storage chamber;

[0010] The spraying system includes a first spraying component, a second spraying component, and a third spraying component. The first spraying component sprays water from the first water storage chamber onto the top of the first tray. The second spraying component sprays water from the second water storage chamber onto the top of the second tray. The third spraying component sprays water from the third water storage chamber onto the top of the third tray.

[0011] By adopting the above technical solution, when the equipment is first started, water at a first temperature is added to the first water storage chamber, water at a second temperature is added to the second water storage chamber, and water at a third temperature is added to the third water storage chamber, with the first temperature > the second temperature > the third temperature. Three independent cooling chambers with different temperatures replace the traditional single-temperature water tank, thus achieving a gradual cooling of the hose from slow to rapid. The high-temperature hose (approximately 180-220℃) exiting the hose extruder first reaches the first pallet. The hose is initially cooled by spraying with water at a relatively high first temperature (e.g., 50-60℃). This avoids the thermal shock of "ice and fire," allowing the outer material to cool slowly without instantly hardening and blocking the heat conduction path, giving the inner layer sufficient time to conduct heat to the outer layer. This greatly reduces the internal stress caused by the different cooling rates of the inner and outer layers, laying a good foundation for subsequent cooling, thus reducing the risk of damage to the hose's strength and improving hose quality. After gentle cooling in the first water storage chamber, the overall temperature of the hose has decreased uniformly. At this point, cooler water (e.g., 25-35℃) is sprayed for further cooling. Since the temperature difference between the inside and outside has been reduced, rapid cooling at this point will not generate significant stress and can efficiently cool the hose to near the water temperature. In the third water chamber, even cooler water (e.g., 15-25°C, or even cooling water) is used for final cooling of the hose, ensuring that both its internal and external temperatures drop to room temperature and stabilize completely, thus achieving final cooling.

[0012] Furthermore, since one end of the second tray is located below the first tray and the other end is located above the second water storage chamber, the freshly extruded high-temperature hose continuously replenishes heat to the water on the first tray. The water on the first tray reaches the second tray through the end away from the hose extruder, and then flows into the first and second water storage chambers respectively through both ends of the second tray. This ensures a continuous supply of heat to both chambers, preventing the water temperature from cooling down easily. Additionally, some water returning to the first water storage chamber is cooled by the water in the second water storage chamber, preventing the water temperature in the first water storage tank from rising too quickly and thus stabilizing the water temperature.

[0013] Optionally, the first spray assembly includes a first main pipe, a first water pump, and a plurality of first bamboo-joint spray pipes. The first main pipe is disposed on one side of the water tank. One end of the first water pump is connected to the bottom of the first water storage chamber, and the other end is connected to the first main pipe. The length direction of the first main pipe is the same as the length direction of the first water storage chamber. The plurality of first bamboo-joint spray pipes are spaced apart along the length direction of the first main pipe, and the nozzles of the first bamboo-joint spray pipes face the lowest position of the top surface of the first tray.

[0014] By adopting the above technical solution, the first main pipe is connected to several first bamboo-joint water spray pipes. After the first water pump drives water from the first water storage chamber into the first main pipe, the water can flow out from the first bamboo-joint water spray pipes. The bamboo-joint water spray pipes are selected to facilitate the adjustment of the water spray position.

[0015] Optionally, a trademark printer may also be included, which is disposed between the water-cooling mechanism and the traction mechanism.

[0016] By adopting the above technical solution, the hose can be easily printed with trademarks after cooling.

[0017] Optionally, the water temperature in the first water storage chamber is 50-60℃, the water temperature in the second water storage chamber is 25-35℃, and the water temperature in the third water storage chamber is 10-25℃.

[0018] By adopting the above technical solution, the water temperature in the first water storage chamber is set to be higher, while the temperature in the second water storage chamber is set to be significantly lower, allowing the high-temperature tube blank to exchange heat with water at 50-60℃. The outer layer does not instantly vitrify, allowing heat to be conducted gradually and continuously from the inner layer to the outer layer. This provides a time window for the relaxation and orderly arrangement of the polymer chains, thereby reducing stress generation in both the outer and inner layers, ensuring the long-term dimensional stability, bending fatigue resistance, and peel strength (of multilayer tubes).

[0019] The second water storage chamber, with a water temperature of 25-35℃, serves as the main cooling zone. After being gently cooled by the first chamber, the overall temperature of the hose has dropped below 100℃, with a very small temperature difference between the inside and outside. At this point, using 25-35℃ warm water for efficient cooling will not generate significant thermal stress. This achieves a substantial increase in cooling efficiency while ensuring low stress, allowing the production line to maintain a high speed and ensuring that the hose obtains sufficient rigidity and shape retention.

[0020] Optionally, the volume of the first water storage chamber is 1 / 4 to 2 / 3 of the volume of the second water storage chamber.

[0021] Optionally, the distance between the lowest point of the top of the second tray and the lowest point of the bottom surface of the first tray is 0.5-1cm, and during operation, the spray system keeps the water level on the second tray at 1.5-2cm.

[0022] By adopting the above technical solution, less water flows back from the second tray to the first water storage chamber, but the total amount of water flowing on the second tray is greater. This results in most of the water flowing on the second tray entering the second water storage chamber and a small portion entering the first water storage chamber, thereby better controlling the temperature gradient. Without any other additional heating control, the water temperature in the first water storage chamber is automatically and continuously maintained at 50-60℃, and the water temperature in the second water storage chamber is automatically and continuously maintained at 25-35℃.

[0023] Optionally, the inner wall of the water tank is provided with a plurality of insertion slots for the first partition plate to be inserted, and the insertion slots are arranged along the length of the water tank.

[0024] By adopting the above technical solution, the position of the first partition plate in the insertion slot can be adjusted as needed, thereby adjusting the volume of the first water storage chamber and the second water storage chamber.

[0025] Optionally, the bottom of the first tray, the second tray, and the third tray are provided with support bases, which are placed inside the water tank.

[0026] By adopting the above technical solution, it is convenient to install the first tray, the second tray, and the third tray inside the water tank.

[0027] In summary, this application includes at least one of the following beneficial technical effects:

[0028] 1. The proposed solution achieves a gradual cooling of the hose from slow to rapid, reducing internal stress caused by the large difference in cooling rates between the inner and outer layers, thus preventing damage to the hose's strength and improving its quality. 2. One end of the second support plate is located below the first support plate, and the other end is located above the second water storage chamber. The volume of the first water storage chamber is 1 / 4 to 2 / 3 of the volume of the second water storage chamber. The distance between the lowest point of the top of the second support plate and the lowest point of the bottom surface of the first support plate is 0.5-1 cm. During operation, the spray system maintains the water level on the second support plate at 1.5-2 cm, facilitating better control of the temperature gradient within each water storage chamber. Without additional heating control, the water temperature in the first water storage chamber is continuously maintained at 50-60℃, and the water temperature in the second water storage chamber is continuously maintained at 25-35℃. Attached Figure Description

[0029] Figure 1 This is a schematic diagram of the overall structure of a high-quality plastic hose extrusion molding production line according to an embodiment.

[0030] Figure 2 This is a partial view of the high-quality plastic hose extrusion molding production line of the embodiment, mainly showing the structure inside the water tank.

[0031] Figure 3 yes Figure 2 The enlarged view at point A mainly shows the connector slot.

[0032] Figure 4 This is a partial view of a high-quality plastic hose extrusion molding production line according to an embodiment, mainly showing the pallet assembly.

[0033] Explanation of reference numerals in the attached drawings: 1. Hose extruder; 2. Label printer; 3. Traction mechanism; 4. Water tank; 41. First partition plate; 42. Second partition plate; 43. First water storage chamber; 44. Second water storage chamber; 45. Third water storage chamber; 46. Insertion groove; 5. Support plate assembly; 51. First support plate; 52. Second support plate; 53. Third support plate; 6. Spraying system; 61. First spraying assembly; 611. First main pipe; 612. First water pump; 613. First bamboo-joint spray pipe; 62. Second spraying assembly; 621. Second main pipe; 622. Second water pump; 623. Second bamboo-joint spray pipe; 63. Third spraying assembly; 631. Third main pipe; 632. Third water pump; 633. Third bamboo-joint spray pipe; 64. Support base. Detailed Implementation

[0034] The present application will be further described in detail below with reference to the accompanying drawings.

[0035] This application discloses a high-quality plastic hose extrusion molding production line. (Refer to...) Figure 1 A high-quality plastic hose extrusion molding production line includes a hose extruder 1, a water cooling mechanism, a label printer 2, and a traction mechanism 3 arranged in sequence. The hose extruder 1 heats plastic particles and extrudes them into hoses. The hose material is polyethylene, and the extrusion temperature is between 180-220℃, specifically 200℃. The water cooling mechanism is used to cool and shape the hoses. The label printer 2, which is commercially available, is located between the water cooling mechanism and the traction mechanism 3. The label printer 2 prints the label on the outer wall of the cooled hose. The traction mechanism 3 moves the hose along the production line.

[0036] Reference Figure 1 , Figure 2 The water-cooling mechanism includes a water tank 4, a support plate assembly 5, and a spray system 6. A first partition plate 41 and a second partition plate 42 are fixed inside the water tank 4. The height of the first partition plate 41 and the second partition plate 42 is lower than the height of the opening of the water tank 4. The first partition plate 41 and the second partition plate 42 divide the water tank 4 into a first water storage chamber 43, a second water storage chamber 44, and a third water storage chamber 45. The volume of the first water storage chamber 43 is 1 / 4 to 2 / 3 of the volume of the second water storage chamber 44.

[0037] Reference Figure 3 The inner wall of the water tank 4 is provided with several insertion slots 46 for the first partition plate 41 to be inserted. The insertion slots 46 are arranged along the length of the water tank 4. The position of the first partition plate 41 can be adjusted as needed, thereby adjusting the volume of the first water storage chamber 43 and the second water storage chamber 44.

[0038] When the production line is working, the water temperature in the first water storage chamber 43 is 50-60℃, the water temperature in the second water storage chamber 44 is 25-35℃, and the water temperature in the third water storage chamber 45 is 10-25℃.

[0039] Reference Figure 1 , Figure 4 The tray assembly 5 includes a first tray 51, a second tray 52, and a third tray 53. The length of the first tray 51, the second tray 52, and the third tray 53 extends along the length of the water tank 4. The first tray 51, the second tray 52, and the third tray 53 are all concave arc plates with uniform thickness, and the lowest point of the arc surface of the first tray 51, the second tray 52, and the third tray 53 extends along the length of the water tank 4.

[0040] Reference Figure 1 , Figure 4 One end of the first tray 51 is located above the first water storage chamber 43, and the other end extends above the second water storage chamber 44.

[0041] Reference Figure 1 , Figure 4 The second tray 52 is positioned below the first tray 51. One end of the second tray 52 is located below the first tray 51 and above the first water storage chamber 43; the other end is located above the second water storage chamber 44 near the second partition plate 42.

[0042] Reference Figure 1 , Figure 4 The third tray 53 is located above the third water storage chamber 45 at both ends, with one end located above the second partition plate 42 and the other end located above the end of the water tank 4 away from the hose extruder 1.

[0043] Reference Figure 1 , Figure 2 The spray system 6 includes a first spray assembly 61, a second spray assembly 62, and a third spray assembly 63. The first spray assembly 61 sprays water from the first water storage chamber 43 onto the top of the first tray 51. The second spray assembly 62 sprays water from the second water storage chamber 44 onto the top of the second tray 52. ​​The third spray assembly 63 sprays water from the third water storage chamber 45 onto the top of the third tray 53.

[0044] Reference Figure 1 , Figure 2The first spray assembly 61 includes a first main pipe 611, a first water pump 612, and a plurality of first bamboo-joint spray pipes 613. The first main pipe 611 is disposed on one side of the water tank 4. One end of the first water pump 612 is connected to the bottom of the first water storage chamber 43, and the other end is connected to the first main pipe 611. The length direction of the first main pipe 611 is the same as the length direction of the first water storage chamber 43. The plurality of first bamboo-joint spray pipes 613 are spaced apart along the length direction of the first main pipe 611. The nozzles of the first bamboo-joint spray pipes 613 face the lowest position of the top surface of the first support plate 51.

[0045] Reference Figure 1 , Figure 2 The second spray assembly 62 includes a second main pipe 621, a second water pump 622, and a plurality of second bamboo-joint spray pipes 623. The second main pipe 621 is disposed on one side of the water tank 4. One end of the second water pump 622 is connected to the bottom of the second water storage chamber 44, and the other end is connected to the second main pipe 621. The length direction of the second main pipe 621 is the same as the length direction of the second water storage chamber 44. The plurality of second bamboo-joint spray pipes 623 are spaced apart along the length direction of the second main pipe 621. The nozzles of the second bamboo-joint spray pipes 623 face the lowest position of the top surface of the second support plate 52.

[0046] Reference Figure 1 , Figure 2 The third spray assembly 63 includes a third main pipe 631, a third water pump 632, and several third bamboo-joint spray pipes 633. The third main pipe 631 is located on one side of the water tank 4. One end of the third water pump 632 is connected to the bottom of the third water storage chamber 45, and the other end is connected to the third main pipe 631. The length direction of the third main pipe 631 is the same as the length direction of the third water storage chamber 45. Several third bamboo-joint spray pipes 633 are spaced apart along the length direction of the third main pipe 631. The nozzles of the third bamboo-joint spray pipes 633 face the lowest position of the top surface of the third support plate 53.

[0047] Reference Figure 1 , Figure 2 , Figure 4 The first bamboo-section water spray pipe 613, the second bamboo-section water spray pipe 623, and the third bamboo-section water spray pipe 633 are evenly spaced. The length of the second support plate 52 is longer than that of the first bamboo-section water spray pipe 613. The distance between the lowest point of the top of the second support plate 52 and the lowest point of the bottom surface of the first support plate 51 is 0.5-1cm. During operation, the spray system 6 maintains the water level on the second support plate 52 at 1.5-2cm.

[0048] Reference Figure 2 , Figure 4The volume of the first water storage chamber 43 is smaller than that of the second water storage chamber 44, which makes it easy for the water in the first water storage chamber 43 to increase significantly. Therefore, the distance between the lowest point of the top of the second support plate 52 and the lowest point of the bottom surface of the first support plate 51 is set to be smaller, reducing the amount of water flowing back from the second support plate 52 into the first water storage chamber 43, so that the water level in the first water storage chamber 43 does not rise too quickly.

[0049] Reference Figure 4 The bottom of the first tray 51, the second tray 52 and the third tray 53 are provided with support bases 64. The support bases 64 are placed in the water tank 4 and support the first tray 51, the second tray 52 and the third tray 53 in the water tank 4.

[0050] The traction mechanism 3 is a commercially available double belt traction machine. The double belt traction machine includes two sets of belt assemblies and two sets of motors (not shown in the figure). The belt assembly includes two pulleys and belts tensioned and connected to the two pulleys. The two sets of belt assemblies are arranged vertically. The motors drive the pulleys of one belt assembly to rotate one by one. The two sets of belt assemblies rotate in opposite directions, so that the belts that are close to each other will drive the hose to move.

[0051] The implementation principle of a high-quality plastic hose extrusion molding production line according to an embodiment of this application is as follows: Before production, appropriate amounts of water are added to the first water storage chamber 43, the second water storage chamber 44, and the third water storage chamber 45. This water can be entirely cold water, or initially, water at 50-60°C is added to the first water storage chamber 43, water at 25-35°C to the second water storage chamber 44, and water at 10-25°C to the third water storage chamber 45. If all added water is cold water, it typically requires a period of operation for the water temperature to reach a suitable level due to the heat transferred from the newly extruded hose.

[0052] During production, the hose extruder 1 extrudes the hose, which is then pulled by the traction machine to pass through the first support plate 51, the second support plate 52 and the third support plate 53 in sequence. At the same time, the first bamboo section water spray pipe 613, the second bamboo section water spray pipe 623 and the third bamboo section water spray pipe 633 spray water onto the hose to achieve cooling and shaping. Then the hose passes through the trademark printer 2 and the double belt traction machine before being discharged.

[0053] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this invention, "a plurality of" means two or more, unless otherwise explicitly specified.

[0054] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0055] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "over," and "on top" of the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0056] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0057] 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 high-quality plastic hose extrusion molding production line, comprising a hose extruder (1), a water cooling mechanism, and a traction mechanism (3) arranged in sequence, characterized in that: The water cooling mechanism includes a water tank (4), a tray assembly (5), and a spray system (6). The water tank (4) is equipped with a first partition plate (41) and a second partition plate (42). The height of the first partition plate (41) and the second partition plate (42) is lower than the height of the opening of the water tank (4). The first partition plate (41) and the second partition plate (42) divide the water tank (4) into a first water storage chamber (43), a second water storage chamber (44), and a third water storage chamber (45). The tray assembly... (5) Includes a first tray (51), a second tray (52) and a third tray (53); the length direction of the first tray (51), the second tray (52) and the third tray (53) extends along the length direction of the water tank (4), the first tray (51), the second tray (52) and the third tray (53) are concave arc plates, and the lowest point of the arc surface of the first tray (51), the second tray (52) and the third tray (53) extends along the length direction of the water tank (4); One end of the first tray (51) is located above the first water storage chamber (43), and the other end extends to the top of the second water storage chamber (44); The second tray (52) is located below the first tray (51). One end of the second tray (52) is located below the first tray (51) and above the first water storage chamber (43), and the other end is located above the second water storage chamber (44). The two ends of the third support plate (53) are located above the third water storage chamber (45); The spray system (6) includes a first spray assembly (61), a second spray assembly (62) and a third spray assembly (63). The first spray assembly (61) sprays water from the first water storage chamber (43) onto the top of the first tray (51). The second spray assembly (62) sprays water from the second water storage chamber (44) onto the top of the second tray (52). The third spray assembly (63) sprays water from the third water storage chamber (45) onto the top of the third tray (53). The volume of the first water storage chamber (43) is 1 / 4 to 2 / 3 of the volume of the second water storage chamber (44); The water temperature in the first water storage chamber (43) is 50-60℃, the water temperature in the second water storage chamber (44) is 25-35℃, and the water temperature in the third water storage chamber (45) is 10-25℃. The distance between the lowest point of the top of the second tray (52) and the lowest point of the bottom surface of the first tray (51) is 0.5-1cm. During operation, the spray system (6) keeps the water level on the second tray (52) at 1.5-2cm.

2. The high-quality plastic hose extrusion molding production line according to claim 1, characterized in that: The first spray assembly (61) includes a first main pipe (611), a first water pump (612), and a plurality of first bamboo-joint spray pipes (613). The first main pipe (611) is located on one side of the water tank (4). One end of the first water pump (612) is connected to the bottom of the first water storage chamber (43), and the other end is connected to the first main pipe (611). The length direction of the first main pipe (611) is the same as the length direction of the first water storage chamber (43). A plurality of first bamboo-joint spray pipes (613) are spaced apart along the length direction of the first main pipe (611). The nozzles of the first bamboo-joint spray pipes (613) face the lowest position on the top surface of the first tray (51).

3. The high-quality plastic hose extrusion molding production line according to claim 1, characterized in that: It also includes a trademark printer (2), which is disposed between the water cooling mechanism and the traction mechanism (3).

4. The high-quality plastic hose extrusion molding production line according to claim 1, characterized in that: The inner wall of the water tank (4) is provided with a plurality of insertion slots (46) for the first partition plate (41) to be inserted into, and the insertion slots (46) are arranged along the length of the water tank (4).

5. The high-quality plastic hose extrusion molding production line according to claim 1, characterized in that: The bottom of the first tray (51), the second tray (52) and the third tray (53) are provided with support bases (64), which are placed in the water tank (4).

Images