A pu tube and a forming die and a forming method thereof

Abstract

The application discloses a PU pipe and a forming die and a forming method thereof, which comprise an extruder, a die mounting base and a forming die body clamped and mounted at the right end of the die mounting base, radiating fins are arranged on the front and back sides of the forming die body, the radiating fins are moved leftward and rightward through the expansion and contraction mechanism arranged at the front and back ends of the die mounting base, a cooling pipe in a ring shape is fixed to the inner side of the fixed frame, a plurality of cooling air nozzles for blowing cold air to the PU pipe and cooling the PU pipe are arranged at equal angles on the inner side of the cooling pipe, and the right side of the fixed frame is provided with an auxiliary mechanism with an extrusion shaping function. The PU pipe and the forming die and the forming method thereof are convenient for quickly disassembling, assembling and replacing the forming die body and the die mounting base, the PU pipe just extruded is blown and cooled through the cooling pipe and the cooling air nozzle, soft collapse is prevented, and the PU pipe just extruded can be extrusion formed through the arrangement of the auxiliary mechanism.

Description

Technical Field

[0001] This invention relates to the technical field of PU pipe molding molds, specifically to a PU pipe, its molding mold, and a molding method. Background Technology

[0002] PU stands for polyurethane, a polymer material typically made from isoniazid (MDI) and raw materials such as polyether, polyester, and polyol through a reaction. PU pipes are polyurethane pipes extruded through an extruder. They have many advantages such as wear resistance, oil resistance, aging resistance, and chemical corrosion resistance, and are widely used in many fields such as industry, agriculture, food, medicine, and civil engineering. In the production and manufacturing process of PU pipes, molding dies are required to extrude PU pipes of corresponding diameters according to the shape of the molding die.

[0003] As disclosed in announcement number CN115256863B, a PU tube, its molding die, and molding method are described. This PU tube is processed into a colored PU tube through a double-layer co-extrusion process. The outer layer of the PU tube is a color masterbatch layer, and the inner layer is a polyurethane layer, which reduces the amount of color masterbatch used. Furthermore, an observation port is provided on the side of the color masterbatch layer, which allows the PU tube to be distinguished and the internal fluid flow to be observed. The inner layer aligned with the observation port is the virgin polyurethane material layer, which reduces the requirements for the extruder. This molding die can control the size of the observation port as needed and can automatically adjust the amount of virgin material used according to the size of the observation port, which can save the amount of virgin polyurethane material used and ensure the recycling of recycled materials.

[0004] As disclosed in announcement number CN220995377U, a plastic pipe extrusion mold includes an extruder and an extrusion mold. The extruder is provided with a connecting block, which is fixedly connected to the extruder. An installation block is provided on the outside of the connecting block. Pushing the extrusion mold causes the fixed block to move. When the limiting groove on the installation block moves to the positioning block, the pressure on the limiting spring disappears. The limiting spring drives the positioning block to reset and insert into the limiting groove of the installation block through the slider. The extrusion mold can be installed and fixed on the extruder. Therefore, when installing the extrusion mold on the extruder, no special tools are needed. The extrusion mold can be installed and fixed on the extruder simply by plugging it in. The installation and fixing is simple and convenient, saving time and effort.

[0005] However, existing PU tubes, their molding dies, and molding methods still have the following shortcomings:

[0006] Existing PU tubes, their molding dies, and molding methods lack components for heat dissipation of the molding dies themselves. The molds are kept at high temperatures for extended periods, which can negatively impact product production. Furthermore, the extruded PU tubes need to be transported a distance before being cooled by external cooling equipment, such as cooling water tanks. Without timely and rapid initial cooling at the extrusion outlet, the freshly formed PU tubes are prone to collapsing, affecting the molding effect. Moreover, it is inconvenient to extrude and shape the freshly extruded PU tubes.

[0007] Therefore, we propose a PU pipe, its molding die, and its molding method to solve the problems mentioned above. Summary of the Invention

[0008] The purpose of this invention is to provide a PU tube, its molding die, and its molding method to solve the problems mentioned in the background art, such as the lack of a component for heat dissipation of the molding die itself, the mold being in a high-temperature state for a long time, which will have an adverse effect on product production, and the fact that the extruded PU tube needs to be transported a distance before being cooled by external cooling equipment, such as a cooling water tank, without timely initial rapid cooling at the extrusion outlet, the newly formed PU tube is prone to collapse, affecting the molding effect, and it is inconvenient to squeeze and shape the newly extruded PU tube.

[0009] To achieve the above objectives, the present invention provides the following technical solution: a PU tube, its molding die, and a molding method, comprising an extruder, a die mounting base, and a molding die body fitted and mounted on the right end of the die mounting base; the PU tube is formed by extruding organic diisocyanate or polyhydroxy compound as the main material after mixing; heat dissipation fins are attached to both the front and rear sides of the molding die body, and the heat dissipation fins can move left and right through telescopic mechanisms provided at the front and rear ends of the die mounting base;

[0010] It also includes a fixed frame, on the inner side of which a ring-shaped cooling pipe is fixed, and multiple cooling nozzles that blow cold air onto the PU pipe and cool it are arranged at equal angles on the inner side of the cooling pipe. An auxiliary mechanism with extrusion and shaping function is arranged at equal angles on the right side of the fixed frame, and the auxiliary mechanism forms an elastic structure at the right end of the fixed frame.

[0011] The upper and lower sides of the right end of the mold mounting base are fixedly connected to the fixing plates for positioning, and the fixing plates are engaged with the fixing blocks in the middle. The fixing blocks are fixed to the upper and lower ends of the left side of the forming mold body respectively.

[0012] The molding die body and the die mounting base are connected by limiting mechanisms symmetrically arranged at the upper and lower ends of the die mounting base. The limiting mechanisms drive the molding die body to form a disassembly structure at the right end of the die mounting base.

[0013] Meanwhile, the limiting mechanism consists of connecting plates fixed on the upper and lower sides of the right end of the mold mounting base, a connecting rod inserted into the middle of the connecting plate, a connecting post hinged to the right end of the connecting rod, a mounting rod fixedly connected to the right end of the connecting post, and a mounting cap with a limiting function.

[0014] The connecting column drives the mounting rod to form a flipping structure at the right end of the connecting rod, and both the front and rear ends of the mounting rod are engaged with the fixing block. The connecting rod is telescopically connected in the connecting plate, and the outer surface of the connecting rod is threaded with a mounting cap.

[0015] Meanwhile, the mounting cap is fitted onto the left side of the connecting plate.

[0016] Preferably, the telescopic mechanism includes a nested movable column and a support column. The movable column is fixed to the heat sink by bolts, and anti-detachment blocks are fixedly connected to the upper and lower sides of the left end of the movable column. The movable column drives the anti-detachment blocks to form a left-right sliding structure with the support column.

[0017] Preferably, the movable column and the support column are limited by a fastening bolt that passes through the right end of the support column.

[0018] Preferably, the fixed frame is connected to the mold mounting base via a fixed bracket fixed on the left side, a support plate is fixedly connected to the outer side of the right end of the fixed frame, and a connecting bolt for adjustment is threadedly connected to the middle of the support plate. An auxiliary plate is rotatably connected to the side of the connecting bolt near the fixed frame, and a side plate is fixedly connected to the right end of the auxiliary plate.

[0019] The side plate and the positioning block fixed to the right end of the fixed frame form a sliding structure.

[0020] Preferably, the auxiliary mechanism consists of a connecting bracket located on the right side of the fixed frame and a clamping rod rotatably mounted in the middle of the connecting bracket and fitted against the PU tube.

[0021] Preferably, a hollow plate is fixedly connected to the middle of the connecting bracket, and a sliding structure is formed between the hollow plate and the side plate. A buffer spring is provided between the hollow plate and the positioning block.

[0022] This solution also provides another technical solution: a method for using a PU tube and its molding die, the method comprising the following steps:

[0023] Step 1: By setting up a limiting mechanism, quick disassembly and replacement of the molding die body and the die mounting base can be achieved;

[0024] Step 2: The telescopic mechanism drives the heat sink to move left and right at both ends of the mold mounting base. The heat sink is attached to the front and rear sides of the molding mold body to improve the heat dissipation effect of the molding mold body itself and prevent the molding mold body from overheating.

[0025] Step 3: Quickly blow air onto the freshly extruded PU tube through the cooling pipe connected to the air cooler and the cooling nozzles set inside the cooling pipe to cool it down and prevent it from collapsing.

[0026] Step 4: By setting up auxiliary mechanisms, the extruded PU tube can be extruded and shaped.

[0027] Compared with the prior art, the beneficial effects of the present invention are as follows: the PU tube, its molding die, and the molding method, through the setting of the limiting mechanism, facilitate the quick disassembly and replacement between the molding die body and the mold mounting base. The telescopic mechanism drives the heat sink to move left and right and fit against the front and rear sides of the molding die body, which can dissipate heat and cool the molding die body itself, preventing the molding die body from being too hot during long-term use and affecting product production. Moreover, the cooling pipe and cooling air nozzle blow air to cool the freshly extruded PU tube to prevent it from collapsing. Combined with the setting of the auxiliary mechanism, the freshly extruded PU tube can be extruded and molded.

[0028] 1. It is equipped with a fixing block, a fixing plate and a limiting mechanism. The limiting mechanism includes a connecting plate, a connecting rod, a connecting column, a mounting rod and a mounting cap. With the setting of the fixing block, the fixing plate and the limiting mechanism, the molding mold body and the mold mounting base can be disassembled and replaced very quickly and stably.

[0029] 2. It is equipped with heat sinks and telescopic structure. The telescopic structure includes nested movable columns and support columns. The telescopic structure drives the heat sinks to move left and right on the front and rear sides of the mold mounting base, so that the heat sinks are fitted to the front and rear sides of the molding mold body. This allows the heat sinks to be quickly dissipated from the molding mold body and prevent the molding mold body from overheating during long-term use, which would affect the production quality of the product.

[0030] 3. Equipped with cooling pipes and cooling nozzles, the cooling pipes are connected to an external air cooler. Through the cooling pipes and cooling nozzles, cold air is blown onto the PU tube, thereby quickly cooling the freshly extruded PU tube and preventing it from collapsing.

[0031] 4. An auxiliary mechanism is provided, which consists of a connecting bracket and a clamping roller that rotates on the connecting bracket. The auxiliary mechanism enables further extrusion molding of the freshly extruded PU tube and facilitates stable conveying of the PU tube for the next step of processing. Attached Figure Description

[0032] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0033] Figure 2 This is a schematic diagram of the overall structure of the mold mounting base, molding mold body, heat sink and fixing frame of the present invention;

[0034] Figure 3 For the present invention Figure 1 Enlarged structural diagram at point A in the middle;

[0035] Figure 4 This is a schematic diagram of the overall structure of the mold mounting base, the molding mold body, and the limiting mechanism of the present invention;

[0036] Figure 5 This is a top view of the structure of the limiting mechanism of the present invention;

[0037] Figure 6 This is a schematic diagram of the structure in which the connecting column, mounting rod, and fixing block flip and detach.

[0038] Figure 7 This is a rear view structural diagram of the mold mounting base, molding mold body, heat sink and telescopic mechanism of the present invention;

[0039] Figure 8 This is a schematic diagram of the explosion structure of the movable column, support column, heat sink, anti-detachment block, and fastening bolt of the present invention;

[0040] Figure 9 This is a side view of the structure of the present invention;

[0041] Figure 10 This is a schematic diagram of the overall structure of the fixing frame, cooling pipe, cooling nozzle and PU pipe of the present invention;

[0042] Figure 11 This is a schematic diagram of the overall structure of the PU tube passing through the cooling tube and cooling nozzle of the present invention;

[0043] Figure 12 This is a schematic diagram of the fixed frame, PU tube, and auxiliary mechanism of the present invention;

[0044] Figure 13 This is an exploded structural diagram of the connecting bracket, clamping rod, hollow plate, and positioning block of the present invention.

[0045] In the diagram: 1. Extruder; 2. Mold mounting base; 3. Molding mold body; 4. Fixing block; 5. Fixing plate; 6. Connecting plate; 7. Connecting rod; 8. Connecting column; 9. Mounting rod; 10. Mounting cap; 11. Heat sink; 12. Movable column; 13. Support column; 14. Anti-detachment block; 15. Fastening bolt; 16. Fixing bracket; 17. Fixing frame; 18. Cooling pipe; 19. Cooling nozzle; 20. Support plate; 21. Connecting bolt; 22. Auxiliary plate; 23. Side plate; 24. Positioning block; 25. Connecting bracket; 26. Clamping roller; 27. Hollow plate; 28. Buffer spring. Detailed Implementation

[0046] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0047] Please see Figures 1-13 The present invention provides the following technical solution:

[0048] To address the shortcomings of existing PU tubes, molding dies, and molding methods, which lack heat dissipation components for the molding die itself, resulting in prolonged high temperatures that negatively impact product production, and the fact that extruded PU tubes need to be transported a distance before being cooled by external cooling equipment such as cooling water tanks, failing to achieve rapid initial cooling at the extrusion outlet, causing the freshly formed PU tubes to easily collapse and affecting the molding effect, and making it inconvenient to extrude and shape the freshly extruded PU tubes, this solution provides a PU tube, its molding die, and molding method, comprising an extruder 1, a die mounting base 2, and a molding die body 3 that is engaged and mounted on the right end of the die mounting base 2.

[0049] like Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 and Figure 6As shown, the PU tube is made by extruding organic diisocyanate or polyhydroxy compound as the main material through an extruder 1. A limiting mechanism is symmetrically arranged at the upper and lower ends of the mold mounting base 2. This limiting mechanism consists of connecting plates 6 fixed to the upper and lower sides of the right end of the mold mounting base 2, a connecting rod 7 inserted into the middle of the connecting plate 6, a connecting post 8 hinged to the right end of the connecting rod 7, a mounting rod 9 fixedly connected to the right end of the connecting post 8, and a mounting cap 10 with a limiting function. First, the molding die body 3 is engaged with the right end of the mold mounting base 2, and the molding die body 3 drives the fixing block 4 to engage with the middle of the fixing plate 5, thus positioning the molding die body 3 and the mold mounting base 2. The connecting column 8 is flipped and rotated at the right end of the connecting rod 7. The connecting column 8 drives the mounting rod 9 to flip, so that the mounting rod 9 is located on the right side of the fixing block 4. Then, the connecting rod 7 is pulled to the left, and the connecting rod 7 and the connecting plate 6 slide together. The connecting rod 7 and the connecting column 8 drive the mounting rod 9 to engage in the middle of the fixing block 4. Then, the mounting cap 10 on the outer surface of the connecting rod 7 is rotated, so that the mounting cap 10 is fitted to the left end of the connecting plate 6, limiting the connection between the connecting rod 7 and the connecting plate 6. Through the setting of the fixing block 4, the fixing plate 5 and the limiting mechanism, it is convenient to quickly disassemble and replace the molding mold body 3 and the mold mounting base 2.

[0050] After installation or replacement, as follows Figure 7 and Figure 8 As shown, heat sinks 11 are attached to both the front and rear sides of the molding die body 3. The heat sinks 11 move left and right through telescopic mechanisms located at the front and rear ends of the mold mounting base 2. The telescopic mechanisms include a nested movable column 12 and a support column 13. When the molding die body 3 is not installed between the mold mounting base 2, the heat sinks 11 are located on the front and rear sides of the mold mounting base 2 to avoid interference with the installation between the molding die body 3 and the mold mounting base 2. After the molding die body 3 is installed, by pulling the movable column 12 to the right, the movable column 12 and the support column 13 slide together. At the same time, the movable column 12 drives the heat sinks 11 to be attached to the front and rear sides of the molding die body 3. Anti-detachment blocks 14 are fixedly connected to the upper and lower ends of the movable column 12. The movable column 12 drives the anti-detachment blocks 14 to slide between the support column 13. When it moves to the position shown in the figure, the heat sinks 11 move left and right through the mold mounting base 2. Figure 7 In the state shown, the support column 13 and the movable column 12 are limited by rotating the fastening bolt 15, thereby positioning the heat sink 11 and the molding die body 3. The heat sink 11 and the molding die body 3 are fitted together, which helps to dissipate the heat of the molding die body 3 more quickly and prevents the heat of the molding die body 3 from accumulating during long-term use, thus affecting the production quality of the product.

[0051] In addition, such as Figure 9 , Figure 10 , Figure 11 , Figure 12 and Figure 13 As shown, the PU tube, which is extruded and formed by the cooperation of the extruder 1, the mold mounting base 2 and the forming mold body 3, moves to the right and passes through the middle of the fixed frame 17. The fixed frame 17 is connected to the mold mounting base 2 through the fixed bracket 16. At the same time, a ring-shaped cooling pipe 18 is fixed on the inner side of the fixed frame 17, and multiple cooling nozzles 19 are set at equal angles on the inner side of the cooling pipe 18, which face the PU tube and blow cold air to cool the PU tube. The cooling pipe 18 is connected to an external cold air fan. When the PU tube is just extruded, cold air is blown into the PU tube through the cooling nozzles 19 to quickly cool it down and prevent it from collapsing during the transportation process. After cooling, it is cooled down by the next stage tool, such as by passing through a long water tank.

[0052] An auxiliary mechanism with extrusion and shaping function is provided at an equal angle on the right side of the fixed frame 17. This auxiliary mechanism forms an elastic structure at the right end of the fixed frame 17. The auxiliary mechanism includes a connecting bracket 25 located on the right side of the fixed frame 17 and a clamping rod 26 rotatably mounted in the middle of the connecting bracket 25 and fitting snugly against the PU tube. A connecting bolt 21, threadedly connected to the middle of the support plate 20, rotates between the connecting bolt 21 and the auxiliary plate 22. The auxiliary plate 22 causes the side plate 23 to slide against the positioning block 24, allowing the anti-detachment block 14 to move the connecting bracket 25 and the clamping rod 26 at the right end of the fixed frame 17. The clamping rollers 26 are respectively attached to the outside of the PU tube. With the help of the auxiliary mechanism, the freshly extruded PU tube can be extruded and shaped. During the conveying process, when the clamping rollers 26 are squeezed, the clamping rollers 26, together with the connecting bracket 25, drive the hollow plate 27 to move, so that the hollow plate 27 slides between the positioning block 24. The hollow plate 27 squeezes the buffer spring 28, so that the buffer spring 28 undergoes elastic deformation. Thus, the clamping rollers 26 form an elastic structure at the right end of the fixed frame 17, which can play a certain buffering role. While clamping, it can also improve the stability of the PU tube during the conveying process.

[0053] The contents not described in detail in this specification are existing technologies known to those skilled in the art. All standard parts used in this invention can be purchased from the market, and irregular parts can be customized according to the description and drawings. The specific connection methods of each part adopt conventional methods such as bolts, rivets, and welding that are mature in the prior art. The machinery, parts and equipment adopt conventional models in the prior art, and the circuit connection adopts conventional connection methods in the prior art, which will not be described in detail here.

[0054] Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A PU tube forming mold, comprising an extruder (1), a mold mounting base (2), and a forming mold body (3) engaged with the right end of the mold mounting base (2); characterized in that, The PU tube is formed by extruding organic diisocyanate or polyhydroxy compound as the main material through an extruder (1). The front and rear sides of the forming mold body (3) are fitted with heat sinks (11), and the heat sinks (11) can move left and right through the telescopic mechanism set at the front and rear ends of the mold mounting base (2). It also includes a fixed frame (17), on the inner side of which a ring-shaped cooling pipe (18) is fixed, and on the inner side of the cooling pipe (18) are multiple cooling nozzles (19) that face the PU pipe and blow cold air to cool the PU pipe. On the right side of the fixed frame (17), an auxiliary mechanism with extrusion and shaping function is provided at equal angles. At the same time, the auxiliary mechanism forms an elastic structure at the right end of the fixed frame (17). The upper and lower sides of the right end of the mold mounting base (2) are fixedly connected to the fixing plates (5) for positioning, and the fixing plates (5) are engaged with the fixing blocks (4) in the middle. At the same time, the fixing blocks (4) are fixed to the upper and lower ends of the left side of the forming mold body (3). The molding die body (3) and the die mounting base (2) are connected by limiting mechanisms symmetrically arranged at the upper and lower ends of the die mounting base (2). The limiting mechanisms drive the molding die body (3) to form a disassembly structure at the right end of the die mounting base (2). Meanwhile, the limiting mechanism consists of a connecting plate (6) fixed on the upper and lower sides of the right end of the mold mounting base (2), a connecting rod (7) inserted into the middle of the connecting plate (6), a connecting post (8) hinged to the right end of the connecting rod (7), a mounting rod (9) fixedly connected to the right end of the connecting post (8), and a mounting cap (10) with a limiting function. The connecting column (8) drives the mounting rod (9) to form a flip structure at the right end of the connecting rod (7), and both the front and rear ends of the mounting rod (9) are engaged with the fixing block (4). The connecting rod (7) is telescopically connected in the connecting plate (6), and the outer surface of the connecting rod (7) is threaded with a mounting cap (10). Meanwhile, the mounting cap (10) is fitted to the left side of the connecting plate (6).

2. The PU tube forming mold according to claim 1, characterized in that: The telescopic mechanism includes a nested movable column (12) and a support column (13). The movable column (12) is fixed to the heat sink (11) by bolts, and anti-detachment blocks (14) are fixedly connected to the upper and lower sides of the left end of the movable column (12). The movable column (12) drives the anti-detachment blocks (14) and the support column (13) to form a left-right sliding structure.

3. The PU tube forming mold according to claim 2, characterized in that: The movable column (12) and the support column (13) are limited by a fastening bolt (15) that passes through the right end of the support column (13).

4. The PU tube forming mold according to claim 1, characterized in that: The fixed frame (17) is connected to the mold mounting base (2) by a fixed bracket (16) fixed on the left side. A support plate (20) is fixedly connected to the outer side of the right end of the fixed frame (17), and a connecting bolt (21) for adjustment is threaded in the middle of the support plate (20). An auxiliary plate (22) is rotatably connected to the side of the connecting bolt (21) near the fixed frame (17), and a side plate (23) is fixedly connected to the right end of the auxiliary plate (22). The side plate (23) and the positioning block (24) fixed to the right end of the fixed frame (17) form a sliding structure.

5. A PU tube forming mold according to claim 4, characterized in that: The auxiliary mechanism consists of a connecting bracket (25) located on the right side of the fixed frame (17) and a clamping rod (26) rotatably mounted in the middle of the connecting bracket (25) and fitted with the PU tube.

6. The PU tube forming mold according to claim 5, characterized in that: A hollow plate (27) is fixedly connected to the middle of the connecting bracket (25), and a sliding structure is formed between the hollow plate (27) and the side plate (23). A buffer spring (28) is provided between the hollow plate (27) and the positioning block (24).

7. A method of using a PU tube molding die as described in claim 1, characterized in that: The method of using the PU tube molding die includes the following steps: Step 1: By setting up a limiting mechanism, quick disassembly and replacement of the molding die body (3) and the die mounting base (2) can be achieved; Step 2: The telescopic mechanism drives the heat sink (11) to move left and right at the front and rear ends of the mold mounting base (2). The heat sink (11) is attached to the front and rear sides of the molding mold body (3) to improve the heat dissipation effect of the molding mold body (3) and prevent the molding mold body (3) from overheating. Step 3: Quickly blow air to cool the freshly extruded PU tube through the cooling pipe (18) connected to the air cooler and the cooling nozzle (19) set inside the cooling pipe (18) to prevent it from collapsing. Step 4: By setting up auxiliary mechanisms, the extruded PU tube can be extruded and shaped.

Images