Cooling device of plastic mold

Abstract

The utility model relates to the technical field of cooling of plastic molds, in particular to a cooling device of a plastic mold. The cooling device of the plastic mold comprises a blow molding machine body, first U-shaped pipes, second U-shaped pipes, an impeller, a filter box and a clamping assembly, a first mold and a second mold are symmetrically installed in the blow molding machine body, the first U-shaped pipes are arranged in the first mold at equal intervals, and insertion pipes are installed at one ends of the first U-shaped pipes; second U-shaped pipes are arranged in the second mold at equal intervals, and inserting grooves matched with the inserting pipes are formed in one ends of the second U-shaped pipes. According to the cooling device of the plastic mold, through the synergistic effect of the multiple sets of first U-shaped pipes and second U-shaped pipes, cooling liquid can flow in the multiple channels at the same time, the contact area and the heat exchange path of the cooling liquid and the mold are increased, then heat of the mold is rapidly taken away, the cooling time is greatly shortened, and the cooling efficiency is improved. And the overall production efficiency is obviously improved.

Description

Technical Field

[0001] This utility model relates to the field of plastic mold cooling technology, and in particular to a cooling device for plastic molds. Background Technology

[0002] In the production process of plastic products, blow molding has been widely used in various industries due to its high efficiency and flexibility. As the core equipment for realizing this process, the blow molding machine works by placing the heated and softened plastic preform into the mold cavity, inflating the preform with compressed air so that it fits tightly against the inner wall of the mold, and then cooling and solidifying to form various hollow plastic products, such as the plastic bottles, plastic buckets and various plastic containers that we see every day.

[0003] Traditional blow molding molds have significant shortcomings in cooling. In most cases, they use a single cooling channel for cooling. This single-channel design limits the flow path of the coolant within the mold, making it impossible to fully and efficiently absorb the heat generated during the blow molding process. This greatly reduces cooling efficiency. Especially when producing large plastic containers, the slow cooling speed forces the molding cycle of individual products to be extended, which in turn seriously affects the overall production progress and reduces the company's production efficiency.

[0004] In addition, the filter device in the cooling system of traditional blow molding machines also has problems; its internal structure is complex, and the operation is cumbersome when cleaning or replacing the filter screen. It usually requires the use of special tools to unscrew the bolts that fix the filter screen one by one before the filter screen can be removed. This process not only consumes time and manpower and increases the workload of workers, but may also damage parts due to frequent disassembly, further increasing equipment maintenance costs and affecting the continuity of production.

[0005] Therefore, it is necessary to provide a new cooling device for plastic molds to solve the above-mentioned technical problems. Utility Model Content

[0006] To solve the above-mentioned technical problems, this utility model provides a cooling device for plastic molds.

[0007] The cooling device for plastic molds provided by this utility model includes: a blow molding machine body, a first U-shaped tube, a second U-shaped tube, an impeller, a filter box, and a snap-fit ​​assembly. A first mold and a second mold are symmetrically installed inside the blow molding machine body. The first mold has first U-shaped tubes equidistantly spaced inside, each with an insert tube at one end. The second mold has second U-shaped tubes equidistantly spaced inside, each with a slot matching the insert tube at one end. An impeller for agitating the coolant is installed inside the first U-shaped tube near the insert tube. A filter box for filtering the coolant is provided on one side of the blow molding machine body. A filter screen frame is installed inside the filter box. A snap-fit ​​assembly is installed between the filter box and the filter screen frame for quick disassembly and replacement of the filter screen.

[0008] Preferably, valve one is symmetrically rotatably connected inside the insertion tube, a first sealing ring is installed on the inner wall of the end of the insertion tube away from the impeller, a trapezoidal plate is fixedly connected to the end of the slot near the second U-shaped tube, valve two is rotatably connected to the middle of the slot, and a second sealing ring is installed on the inner wall of the end of the slot away from the trapezoidal plate.

[0009] Preferably, a connecting seat is installed on one side of both the first mold and the second mold. The first U-shaped tube is connected to a water inlet pipe through the connecting seat, and the second U-shaped tube is connected to a drain pipe through the connecting seat. The other end of the drain pipe is connected to a cooling box.

[0010] Preferably, a liquid storage tank is provided on the side of the blow molding machine body near the filter box. The top of the liquid storage tank is fixedly connected to the filter box. A first pump body is fixedly connected to the top of the liquid storage tank. The output end of the first pump body is connected to the water inlet pipe. The input end of the first pump body is connected to one side of the filter box through a pipe. The other side of the filter box is connected to the inside of the liquid storage tank through a pipe.

[0011] Preferably, the snap-fit ​​assembly includes: a spring, a trapezoidal block, and a trapezoidal groove. Both sides of the filter frame are provided with mounting grooves. Springs are symmetrically fixed to the inner walls of the mounting grooves. The other end of each spring is fixedly connected to a trapezoidal block. The outer wall of the trapezoidal block is slidably connected to the inner wall of the mounting groove. The inner wall of the filter box is symmetrically provided with trapezoidal grooves corresponding to the mounting grooves. The trapezoidal blocks snap-fit ​​with the corresponding trapezoidal grooves.

[0012] Preferably, a second pump body is fixedly connected to the top of the cooling tank. The input end of the second pump body is connected to the interior of the cooling tank through a pipe, and the output end of the second pump body is connected to the liquid storage tank through a pipe.

[0013] Preferably, the end of the insertion tube furthest from the first U-shaped tube is designed with a bevel.

[0014] Compared with related technologies, the cooling device for plastic molds provided by this utility model has the following beneficial effects:

[0015] Through the synergistic effect of multiple sets of first U-shaped tubes and second U-shaped tubes, the coolant can flow simultaneously in multiple channels, increasing the contact area and heat exchange path between the coolant and the mold, thereby quickly removing heat from the mold, significantly shortening the cooling time, and significantly improving overall production efficiency.

[0016] The impeller design allows the coolant that has absorbed the heat from the first mold to be fully mixed, resulting in a more uniform temperature distribution of the coolant and enhancing the heat exchange between the coolant and the mold. This disturbance effect on the coolant further improves the cooling efficiency, ensuring that the mold can be cooled down quickly and evenly.

[0017] The design of the snap-fit ​​assembly between the filter box and the filter screen frame greatly saves disassembly and assembly time, reduces the workload of workers, and reduces the risk of component damage due to frequent disassembly, thereby reducing equipment maintenance costs. Attached Figure Description

[0018] Figure 1 A schematic diagram of the cooling device for the plastic mold provided by this utility model;

[0019] Figure 2 for Figure 1 The diagram shows a cross-sectional view of the first mold.

[0020] Figure 3 for Figure 2 The diagram shows a cross-sectional view of the cannula.

[0021] Figure 4 for Figure 2 The diagram shows a cross-sectional view of the slot.

[0022] Figure 5 for Figure 1 The diagram shows a cross-sectional view of the filter box.

[0023] Figure 6 for Figure 1 The diagram shows the structure of the snap-fit ​​assembly.

[0024] Numbered in the diagram: 1. Blow molding machine body; 2. First mold; 3. Second mold; 4. First U-shaped tube; 5. Insert tube; 6. Second U-shaped tube; 7. Slot; 8. Impeller; 9. Filter box; 10. Filter screen frame; 11. Valve 1; 12. First sealing ring; 13. Trapezoidal plate; 14. Valve 2; 15. Second sealing ring; 16. Connecting seat; 17. Water inlet pipe; 18. Drain pipe; 19. Cooling box; 20. Liquid storage tank; 21. First pump body; 22. Spring; 23. Trapezoidal block; 24. Trapezoidal groove; 25. Second pump body. Detailed Implementation

[0025] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present utility model and are not intended to limit the present utility model.

[0026] The specific implementation of this utility model will be described in detail below with reference to specific embodiments.

[0027] Please see Figures 1 to 6 A cooling device for a plastic mold, comprising: a blow molding machine body 1, a first U-shaped tube 4, a second U-shaped tube 6, an impeller 8, a filter box 9, and a snap-fit ​​assembly. A first mold 2 and a second mold 3 are symmetrically installed inside the blow molding machine body 1. The first mold 2 has first U-shaped tubes 4 evenly spaced inside, each with a insertion tube 5 installed at one end. The second mold 3 has second U-shaped tubes 6 evenly spaced inside, each with a slot 7 matching the insertion tube 5 at one end. An impeller 8 for agitating the coolant is installed inside the first U-shaped tubes 4 near the insertion tube 5. A filter box 9 for filtering the coolant is located on one side of the blow molding machine body 1. A filter screen frame 10 is installed inside the filter box 9. A snap-fit ​​assembly is installed between the filter box 9 and the filter screen frame 10 for quick removal and replacement of the filter screen. Valves 11 are symmetrically rotatably connected inside the insertion tubes 5. A valve 11 is installed on the inner wall of the insertion tube 5 away from the impeller 8. The slot 7 is equipped with a first sealing ring 12. A trapezoidal plate 13 is fixedly connected to the inside of the slot 7 near the end of the second U-shaped tube 6. A valve 14 is rotatably connected to the middle of the slot 7. A second sealing ring 15 is installed on the inner wall of the end of the slot 7 away from the trapezoidal plate 13. A connecting seat 16 is installed on one side of the first mold 2 and the second mold 3. The first U-shaped tube 4 is connected to a water inlet pipe 17 through the connecting seat 16. The second U-shaped tube 6 is connected to a drain pipe 18 through the connecting seat 16. The other end of the drain pipe 18 is connected to a cooling box 19. A liquid storage tank 20 is provided on the side of the blow molding machine body 1 near the filter box 9. The top of the liquid storage tank 20 is fixedly connected to the filter box 9. A first pump body 21 is fixedly connected to the top of the liquid storage tank 20. The output end of the first pump body 21 is connected to the water inlet pipe 17. The input end of the first pump body 21 is connected to one side of the filter box 9 through a pipe. The other side of the filter box 9 is connected to the inside of the liquid storage tank 20 through a pipe. The end of the insertion tube 5 away from the first U-shaped tube 4 is designed with a slope.

[0028] It should be noted that the drive device inside the blow molding machine body 1 consists of components such as a motor, transmission gears, and lead screw and nut. The motor provides power, which is then changed by the transmission gears to drive the lead screw and nut to move, thereby realizing the linear movement of the mold.

[0029] Torque springs 22 are installed at the rotating shafts of valve 11 and valve 24. When the insert tube 5 is inserted into the slot 7, valve 24 is opened and the torsion spring 22 is compressed by the pressure of the inclined end of the insert tube 5. When the trapezoidal plate 13 opens valve 11, valve 11 is similarly opened and the corresponding torsion spring 22 is compressed by the pressure of the trapezoidal plate 13. After the mold has cooled down, the first mold 2 and the second mold 3 move away from each other under the action of the drive device inside the blow molding machine body 1. At this time, the insert tube 5 is disengaged from the corresponding slot 7, and valve 11 and valve 24 return to the closed state under the action of the torsion spring 22. Valve 11 is tightly fitted with the first sealing ring 12 installed inside the insert tube 5, and valve 214 is tightly fitted with the second sealing ring 15 installed inside the slot 7 to ensure sealing.

[0030] Please see Figure 5 and Figure 6 The snap-fit ​​assembly includes: a spring 22, a trapezoidal block 23, and a trapezoidal groove 24. The filter screen frame 10 has mounting grooves on both sides. The inner walls of the mounting grooves are symmetrically fixedly connected with springs 22. The other end of the springs 22 is fixedly connected with trapezoidal blocks 23. The outer wall of the trapezoidal blocks 23 is slidably connected to the inner wall of the mounting groove. The inner wall of the filter box 9 has trapezoidal grooves 24 corresponding to the mounting grooves. The trapezoidal blocks 23 are snap-fitted with the corresponding trapezoidal grooves 24. The top of the cooling box 19 is fixedly connected with a second pump body 25. The input end of the second pump body 25 is connected to the interior of the cooling box 19 through a pipe. The output end of the second pump body 25 is connected to the liquid storage tank 20 through a pipe.

[0031] It should be noted that: a fine filter screen is installed on the side of the filter frame 10 near the input end of the first pump body 21 to filter out small impurities in the coolant, and a coarse filter screen is installed on the other side to filter out large particulate impurities.

[0032] The working principle of the cooling device for plastic molds provided by this utility model is as follows:

[0033] When the blow molding machine body 1 is started, the blow molding process begins. First, the heating device heats the plastic raw material to a softened state, and the softened plastic is extruded through the extrusion mechanism. At this time, the drive device inside the blow molding machine body 1 starts to operate, driving the first mold 2 and the second mold 3 to approach each other along a specific track. As the two gradually approach each other, the softened plastic is precisely loaded into the mold cavity.

[0034] During the approach of the first mold 2 and the second mold 3, the insertion tube 5 inside the first mold 2, near the end of the first U-shaped tube, also moves and begins to approach the slot 7 inside the second mold 3, near the end of the second U-shaped tube. The end of the insertion tube 5 away from the first U-shaped tube has a beveled design. When the insertion tube 5 is inserted into the slot 7, its beveled end first contacts the valve 14, which is rotatably connected inside the slot 7. Due to the continuous advancement of the insertion tube 5, the horizontal component force generated by the bevel gradually pushes the valve 14 open. The valve 14 is designed to rotate around an axis. When subjected to the force of the beveled end of the insertion tube 5, it can smoothly rotate and open around the axis, allowing the insertion tube 5 to proceed. The insertion tube 5 continues to advance into the slot 7 until the trapezoidal plate 13 contacts the valve 11, which is symmetrically and rotatably connected inside the insertion tube 5. The unique contour shape of the trapezoidal plate 13 allows it to open the valve 11 by means of its inclined side when it contacts the valve 11. The valve 11 is also a rotatable connection structure. Under the action of the trapezoidal plate 13, it rotates and opens around its own rotation axis. When the first mold 2 and the second mold 3 are in complete contact and achieve a tight fit, the insertion tube 5 is also completely inserted into the slot 7. At this point, the first U-shaped tube and the second U-shaped tube are successfully connected, creating a passage for the circulation of coolant.

[0035] Next, the first pump 21 starts working, drawing out the coolant stored in the storage tank 20. During the process of drawing out the coolant, it first passes through the filter screen inside the filter box 9. The filter screen is installed on the filter screen frame 10, and the filter screen frame 10 is connected to the filter box 9 by a snap-fit ​​assembly. The coolant enters from one side inlet of the filter box 9. Under pressure, the coolant passes through the filter screen, and the impurities in it are intercepted by the filter screen, thus filtering the coolant and ensuring that the coolant entering the cooling circulation system is clean. This prevents impurities from causing wear or blockage to the mold and cooling pipes. After filtration, the coolant is transported through the water inlet pipe 17 and the connecting seat 16 to the first U-shaped pipes that are equidistantly opened inside the first mold 2.

[0036] The coolant flows along the first U-shaped tube. When it reaches one end near the insertion tube 5, it encounters the impeller 8 installed inside the first U-shaped tube. Under the pressure generated by the continuous delivery of coolant by the first pump body 21, the flow of coolant drives the impeller 8 to rotate. The rotation of the impeller 8 can mix the coolant that has absorbed the heat inside the first mold 2, making the temperature distribution of the coolant more uniform and enhancing the cooling effect. The mixed coolant is delivered to the second U-shaped tube through the insertion tube 5. In the second U-shaped tube, it continues to absorb the heat inside the second mold 3. Subsequently, the coolant that has absorbed the heat from the two molds merges at the end of the second U-shaped tube through the connecting seat 16 and is then discharged into the cooling box 19 through the drain pipe 18.

[0037] In the cooling tank 19, the coolant that has absorbed a large amount of heat will be cooled down. When the coolant inside the cooling tank 19 accumulates to a certain amount and reaches the preset start-up liquid level of the second pump body 25, the second pump body 25 starts to work. The second pump body 25 transports the coolant in the cooling tank 19 to the storage tank 20 through the pipeline to realize the recycling of the coolant.

[0038] Throughout the cooling process, the heat generated by the first mold 2 and the second mold 3 can be quickly and comprehensively removed through the coordinated operation of multiple sets of first U-shaped tubes and second U-shaped tubes, greatly reducing the cooling time and significantly improving production efficiency.

[0039] When it is necessary to clean or replace the filter screen inside the filter box 9, the operation is extremely simple. The operator only needs to hold the specially designed handle on one side of the filter screen frame 10 and pull it outward. During the pulling process, the inner wall of the trapezoidal groove 24 symmetrically opened on the inner wall of the filter box 9 will squeeze the trapezoidal block 23 installed in the installation groove inside the filter screen frame 10. The trapezoidal block 23 slides in the installation groove and compresses the spring 22 connected to it at the same time. As the filter screen frame 10 is continuously pulled, the trapezoidal block 23 gradually comes out of the trapezoidal groove 24 until it is completely detached. At this time, the filter screen frame 10 can be removed from the filter box 9 for cleaning or replacement of the filter screen. After the operation is completed, the filter screen frame 10 is reinserted into the filter box 9. Under the elastic force of the spring 22, the trapezoidal block 23 is once again engaged with the trapezoidal groove 24, completing the installation process. This design greatly saves the operator's disassembly and assembly time and significantly improves work efficiency.

[0040] The above description is merely an embodiment of this utility model and does not limit the patent scope of this utility model. Any equivalent structural or procedural transformations made based on the content of this utility model specification and drawings, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of this utility model.

Claims

1. A cooling device for a plastic mold, characterized in that, include: Blow molding machine body (1), the first mold (2) and the second mold (3) are symmetrically installed inside the blow molding machine body (1); The first U-shaped tube (4) is provided at equal intervals inside the first mold (2), and a tube (5) is installed at one end of each first U-shaped tube (4). The second U-shaped tube (6) is provided at equal intervals inside the second mold (3), and a slot (7) matching the insertion tube (5) is provided at one end of each second U-shaped tube (6). Impeller (8) is installed inside the first U-shaped tube (4) near the insertion tube (5) to agitate the coolant. A filter box (9) is provided on one side of the blow molding machine body (1) for filtering coolant. A filter screen frame (10) is installed inside the filter box (9). A snap-fit ​​assembly is installed between the filter box (9) and the filter frame (10). The snap-fit ​​assembly is used to quickly remove and install the filter frame (10) to replace the filter.

2. The cooling device for plastic molds according to claim 1, characterized in that, The inside of the insertion tube (5) is symmetrically connected to a valve (11). The inner wall of the insertion tube (5) away from the impeller (8) is equipped with a first sealing ring (12). The inside of the slot (7) is fixedly connected to a trapezoidal plate (13) near the second U-shaped tube (6). The middle of the slot (7) is rotatably connected to a valve (14). The inner wall of the slot (7) away from the trapezoidal plate (13) is equipped with a second sealing ring (15).

3. The cooling device for plastic molds according to claim 1, characterized in that, A connecting seat (16) is installed on one side of the first mold (2) and the second mold (3). The first U-shaped pipe (4) is connected to the water inlet pipe (17) through the connecting seat (16). The second U-shaped pipe (6) is connected to the drain pipe (18) through the connecting seat (16). The other end of the drain pipe (18) is connected to the cooling box (19).

4. The cooling device for plastic molds according to claim 3, characterized in that, A liquid storage tank (20) is provided on the side of the blow molding machine body (1) near the filter box (9). The top of the liquid storage tank (20) is fixedly connected to the filter box (9). A first pump body (21) is fixedly connected to the top of the liquid storage tank (20). The output end of the first pump body (21) is connected to the water inlet pipe (17). The input end of the first pump body (21) is connected to one side of the filter box (9) through a pipe. The other side of the filter box (9) is connected to the inside of the liquid storage tank (20) through a pipe.

5. The cooling device for a plastic mold according to claim 1, characterized in that, The snap-fit ​​assembly includes: a spring (22), a trapezoidal block (23) and a trapezoidal groove (24). The filter frame (10) has mounting grooves on both sides. The inner walls of the mounting grooves are symmetrically fixed with springs (22). The other end of the springs (22) is fixedly connected with trapezoidal blocks (23). The outer wall of the trapezoidal blocks (23) is slidably connected to the inner wall of the mounting groove. The inner wall of the filter box (9) is symmetrically provided with trapezoidal grooves (24) corresponding to the mounting grooves. The trapezoidal blocks (23) snap-fit ​​with the corresponding trapezoidal grooves (24).

6. The cooling device for a plastic mold according to claim 3, characterized in that, A second pump body (25) is fixedly connected to the top of the cooling tank (19). The input end of the second pump body (25) is connected to the interior of the cooling tank (19) through a pipe, and the output end of the second pump body (25) is connected to the liquid storage tank (20) through a pipe.

7. The cooling device for plastic molds according to claim 2, characterized in that, The end of the insertion tube (5) away from the first U-shaped tube (4) is designed with a bevel.

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