Cooling system of injection molding machine for plastic product production

Abstract

The invention relates to the technical field of plastic product production, in particular to a cooling system of an injection molding machine for plastic product production, which is matched with the injection molding machine comprising an injection machine, a movable mold, a limiting rod and a return pipe for use, and comprises a cold water pipe, a limiting frame, a disc, a fixed mold, a driving assembly, a sprue extrusion-breaking assembly, a cooling cavity and a conical connecting seat, the limiting frame is installed on the periphery of the limiting rod, and the cold water pipe is connected to the limiting frame. Power is provided for the driving assembly when cooling water flows into the cooling channel, the flowing speed of the cooling water in the spiral channel is increased, the cooling speed of the pouring gate part is greatly increased, and the cooling water after pouring gate cooling flows into the cooling channel again, so that the cooling efficiency is improved. The problems that when high-crystallinity plastic is subjected to injection molding production, the cooling efficiency is low due to the fact that the cooling time is prolonged to fully guarantee the cooling quality, and sprue residues exist on a high-crystallinity plastic product due to insufficient cooling at a sprue, and the appearance of the product is affected are solved.

Description

Technical Field

[0001] This invention relates to the field of plastic product manufacturing technology, specifically to a cooling system for an injection molding machine used in plastic product manufacturing. Background Technology

[0002] An injection molding machine is a molding device used to produce plastic products. It heats and melts plastic material, injects it into a mold cavity, and then cools and solidifies it to form a plastic product with a specific shape and properties. An injection molding machine mainly consists of an injection unit, a mold clamping unit, a hydraulic system, an electrical control system, and a heating and cooling system. Injection molding machines can be classified into vertical injection molding machines, angle injection molding machines, and horizontal injection molding machines according to the arrangement of the injection unit. Among these, the horizontal injection molding machine, with its horizontally arranged injection and mold clamping units, is suitable for the production of large products and is currently the most widely used type.

[0003] When using a horizontal injection molding machine to produce highly crystalline plastics such as polyethylene and polypropylene, compared to other plastic materials, it is necessary to ensure that the highly crystalline plastic products are sufficiently cooled to avoid shrinkage, air bubbles, and dimensional instability caused by insufficient cooling. This requires a longer cooling time for highly crystalline plastics, resulting in low efficiency of the injection molding machine when using highly crystalline plastics as raw materials. In addition, the slower cooling rate will also cause the plastic at the gate to not be fully solidified when the mold is opened, leaving a large gate residue on the highly crystalline plastic product. This not only affects the appearance of the product but also requires additional post-processing steps to remove the residue.

[0004] Therefore, a cooling system for injection molding machines used in the production of plastic products is proposed. Summary of the Invention

[0005] The purpose of this invention is to provide a cooling system for an injection molding machine used in the production of plastic products. By utilizing the power provided by the cooling water flowing into the cooling channel to accelerate the flow speed of the cooling water in the spiral channel, the cooling speed of the gate is greatly improved. Furthermore, the cooling water after the gate is cooled flows back into the cooling channel. This solves the problems of low cooling efficiency and insufficient cooling at the gate during injection molding of high-crystallinity plastics, which are caused by prolonged cooling time to ensure sufficient cooling quality. This also addresses the issue of gate residue on high-crystallinity plastic products, which affects the appearance of the products. The invention significantly improves the cooling efficiency of various parts of high-crystallinity plastic products after injection molding and effectively ensures the injection molding quality of high-crystallinity plastic products.

[0006] To achieve the above objectives, the present invention provides the following technical solution:

[0007] A cooling system for an injection molding machine used in the production of plastic products, compatible with an injection molding machine including an injection unit, a moving mold, a limiting rod, and a return pipe, includes a cold water pipe, a limiting frame, a disc, a fixed mold, a drive assembly, a gate extrusion assembly, a cooling cavity, and a conical connecting seat. The limiting frame is installed on the outer periphery of the limiting rod, the cold water pipe is connected to the limiting frame, the disc is installed at the center of the limiting frame, and the inner periphery of the disc has an arc-shaped guide groove. The fixed mold is disposed inside the limiting frame, and the outer periphery of the fixed mold is sealed and fitted to the inner periphery of the limiting frame. The device includes a sealing sheet, a drive assembly installed between the fixed mold and the limiting frame, a cooling cavity located between the limiting frame, the fixed mold, and the sealing sheet, a conical connecting seat connected between the fixed mold and the limiting frame, and a gate extrusion assembly installed between the disc and the conical connecting seat. The gate extrusion assembly is connected to the drive assembly. When cooling water flows into the cooling cavity through the cold water pipe, the drive assembly provides power to the gate extrusion assembly. The gate extrusion assembly moves in accordance with the arc-shaped guide groove, and the drive assembly accelerates the flow of cooling water within the conical connecting seat.

[0008] As described above, after injection molding, cooling water enters the cooling chamber through the cold water pipe, which can exchange heat with the fixed mold in advance. Then, as the cooling water continues to flow, the flow of cooling water provides power to the drive component, which in turn drives the gate extrusion component, further accelerating the flow speed of the cooling water when cooling the gate. This ensures that the gate position is fully cooled when the mold is opened, thereby improving the cooling efficiency of high-crystallinity plastic products and ensuring the production quality of high-crystallinity plastic products.

[0009] Preferably, the inner wall of the fixed mold is equipped with partition strips, and multiple columns are installed between the outer periphery of the fixed mold and the inner periphery of the limiting frame. The side wall of the fixed mold is constructed with conical flow inlets that are the same number as the partition strips. The partition strips are internally constructed with cooling channels that extend to the side wall of the fixed mold. The side wall of the fixed mold is fitted with a short connector, the end of which is connected to a return pipe, and the end of the cooling channel is located inside the short connector.

[0010] As mentioned above, the cooling channel can increase the heat exchange area between the cooling water and the fixed mold, thereby significantly improving the cooling efficiency of high-crystallinity plastic products and ensuring that the plastic products in contact with the spacer can be cooled evenly, thus avoiding cracking or deformation due to increased internal stress when the high-crystallinity plastic raw material is cooled.

[0011] Preferably, the conical connector has a spiral channel inside, and the conical connector also has a transmission groove extending into the inside of the disc.

[0012] As described above, under the action of the spiral channel and the transmission groove, cooling water enters the interior of the conical connecting seat through the spiral channel, thereby cooling the gate part of the high crystallinity plastic product.

[0013] Preferably, the drive assembly includes a first vane, a rotating shaft, a transmission shaft, and a second vane. The rotating shaft is rotatably mounted on the inner wall of the limiting frame. The first vane is mounted on the end of the rotating shaft and is disposed in the conical inlet. The transmission shaft is rotatably connected to the conical connecting seat, and the end of the transmission shaft near the rotating shaft is connected to the rotating shaft via a bevel gear set. The second vane is mounted on the outer circumference of the transmission shaft and is disposed in the inlet of the spiral channel.

[0014] As described above, when cooling water flows into the conical inlet, the water flow can drive the first swivel to rotate, and then through the transmission effect of the rotating shaft and the drive shaft, drive the second swivel to rotate. When the second swivel rotates, it can accelerate the flow speed of cooling water in the spiral channel, thereby greatly improving the cooling efficiency of the gate part of the high crystallinity plastic product.

[0015] Preferably, the gate extrusion assembly includes a threaded rod, a slider, an extrusion ring, and an annular bar. The threaded rod is rotatably mounted in the transmission groove, and its end is connected to the transmission shaft via a bevel gear set. The end of the threaded rod extends into the arc-shaped guide groove. The slider slides against the transmission groove and is threadedly connected to the threaded portion of the threaded rod. The extrusion ring is disposed in the arc-shaped guide groove, and its end is connected to the outer circumference of the extrusion ring. The annular bar is mounted on the inner circumference of the extrusion ring.

[0016] As described above, when the extrusion ring moves horizontally along the arc-shaped guide groove towards the fixed mold side, it can extrude the raw material at the gate to form a ring-shaped ladder structure, thereby reducing the diameter of the gate. This not only improves the cooling efficiency at the gate, but also ensures that there is sufficient raw material at the gate position, preventing the gate from collapsing due to insufficient raw material, thus greatly improving the injection molding quality of high-crystallinity plastic products.

[0017] Preferably, the conical connecting seat has an internal connecting groove extending into the fixed mold, and the connecting groove is connected to the conical inlet. The connection position between the connecting groove and the conical inlet is located on the side of the first swivel blade near the spacer bar.

[0018] As mentioned above, under the action of the connecting groove, the cooling water in the spiral channel will enter the cooling channel and participate in the cooling of the fixed mold.

[0019] Preferably, the diameter of the conical inlet near the cooling channel is smaller than the diameter of the inlet near the disk.

[0020] As described above, by utilizing the diameter settings at both ends of the conical inlet, when cooling water flows into the conical inlet, the change in the cross-sectional area of ​​the conical inlet can provide sufficient pressure for the rotation of the first blade.

[0021] Preferably, the sealing sheet is a silicone sheet, and the silicone sheet is located on the side of the column near the disk.

[0022] The aforementioned silicone sealing sheet can deform and expand when a large amount of cooling water flows into the cooling chamber, increasing the volume of the cooling chamber. After cooling is completed, the silicone sheet can reverse and revert to its original position under its own elasticity, drawing out the water from the cooling channel. This ensures that there is no residual cooling water in the cooling channel. When high-crystallinity plastic products are injection molded again, the high-crystallinity plastic products can be prevented from being quickly molded on the fixed mold by the cooling water, ensuring the flow effect of the high-crystallinity plastic in the fixed mold. At the same time, the reverse flow of cooling water in the cooling channel drives the extrusion ring to reset.

[0023] Preferably, the diameter of the first blade near the disk is greater than the diameter of the blade near the fixed mold.

[0024] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0025] 1. In this invention, after injection molding of highly crystalline plastic, cooling water enters the cooling chamber through a cold water pipe and flows into the cooling channel through a conical inlet. The flow of cooling water provides power to the drive component, thereby driving the second vane in the component to rotate. This accelerates the flow speed of the cooling water in the conical connecting seat, thus significantly increasing the cooling speed at the gate position. Combined with the conical inlet and the cooling channel, the cooling area of ​​the fixed mold can be effectively increased, thereby effectively improving the cooling speed of the fixed mold. This not only effectively improves the efficiency of injection molding of highly crystalline plastic products, but also ensures that the gate position cools faster than other positions, thus effectively avoiding appearance defects in plastic products caused by raw material backflow during mold opening.

[0026] 2. Through the cooling chamber, partitions, conical inlet, and cooling channel, a certain amount of cooling water can be introduced into the cooling chamber through the cold water pipe after the injection molding operation is completed. Then, a large amount of cooling water can exchange heat with the plastic product through the top mold. Before the cooling water flows into the cooling channel, the temperature of the plastic product can be reduced in advance, thereby effectively improving the cooling efficiency of the plastic product and thus improving the injection molding production efficiency of high crystallinity plastic products.

[0027] 3. By using the gate extrusion component, during the cooling process after injection molding of high-crystallinity plastic products, the flow of cooling water provides power to the extrusion ring, thereby causing the extrusion ring to fit against the edge of the arc-shaped guide groove. This pushes the unsolidified material further into the fixed mold, which not only effectively prevents the gate from being sunken due to insufficient material, but also forms a ring barrier at the gate, thereby reducing the diameter of the gate. This shortens the cooling time of the gate during subsequent cooling and ensures that the gate is fully cooled. Attached Figure Description

[0028] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0029] Figure 2 This is a schematic diagram of the limiting frame of the present invention;

[0030] Figure 3 This is a schematic diagram of the fixed mold structure of the present invention;

[0031] Figure 4 This is a cross-sectional view of the limiting frame of the present invention;

[0032] Figure 5 This is a partial structural cross-sectional view of the mold of the present invention;

[0033] Figure 6 This is a cross-sectional view of the extrusion ring of the present invention;

[0034] Figure 7 This is a cross-sectional view of the tapered connecting seat of the present invention;

[0035] Figure 8 This is a schematic diagram of the reflux pipe of the present invention.

[0036] In the diagram: 1. Injection molding machine; 2. Cold water pipe; 3. Limiting frame; 31. Sealing plate; 4. Moving mold; 5. Limiting rod; 6. Disc; 61. Arc-shaped guide groove; 7. Return pipe; 71. Short connector; 8. Fixed mold; 81. Spacer bar; 82. Column; 83. Conical inlet; 84. Cooling channel; 9. Drive assembly; 91. First vane; 92. Rotating shaft; 93. Transmission shaft; 94. Second vane; 10. Gate extrusion assembly; 101. Threaded rod; 102. Slider; 103. Extrusion ring; 104. Annular bar; 11. Cooling cavity; 12. Conical connecting seat; 121. Spiral channel; 122. Transmission groove; 123. Connecting groove. Detailed Implementation

[0037] 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.

[0038] Please see Figures 1 to 8 This invention provides a cooling system for an injection molding machine used in the production of plastic products. The technical solution is as follows:

[0039] Reference Figure 1-4A cooling system for an injection molding machine used in the production of plastic products, which is used in conjunction with an injection molding machine including an injection unit 1, a moving mold 4, a limiting rod 5, and a return pipe 7. The system includes a cold water pipe 2, a limiting frame 3, a disc 6, a fixed mold 8, a drive assembly 9, a gate extrusion assembly 10, a cooling chamber 11, and a conical connecting seat 12. The limiting frame 3 is installed on the outer periphery of the limiting rod 5, and the cold water pipe 2 is connected to the limiting frame 3. A circular hole is constructed at the center of the limiting frame 3, and the disc 6 is installed at the center of the limiting frame 3, i.e., the disc 6 is embedded in the... In the circular hole, the inner circumference of the disc 6 is constructed with an arc-shaped guide groove 61. The diameter of the arc-shaped guide groove 61 on the side closer to the moving mold 4 is smaller than the diameter on the other side. The fixed mold 8 is set inside the limiting frame 3. A sealing sheet 31 is sealed between the outer circumference of the fixed mold 8 and the inner circumference of the limiting frame 3. The drive assembly 9 is installed between the fixed mold 8 and the limiting frame 3. The cooling cavity 11 is set between the limiting frame 3, the fixed mold 8 and the sealing sheet 31. Under the action of the sealing sheet 31, the space formed by the sealing sheet 31, the fixed mold 8 and the inner side of the limiting frame 3 is the cooling cavity. The cooling chamber 11 and the conical connecting seat 12 are connected between the fixed mold 8 and the limiting frame 3. During injection molding, the high crystallinity raw material enters the fixed mold 8 through the conical connecting seat 12 under the action of the injection molding machine 1. The gate extrusion component 10 is installed between the disc 6 and the conical connecting seat 12, and the gate extrusion component 10 is connected to the drive component 9. When the cooling water flows from the cooling chamber 11 into the structure of the fixed mold 8, it provides power to the drive component 9. When the cooling water flows into the cooling chamber 11 through the cold water pipe 2, the drive component 9 inputs power to the gate extrusion component 10. The gate extrusion component 10 moves in accordance with the arc-shaped guide groove 61, and the drive component 9 accelerates the flow of cooling water in the conical connecting seat 12. After the cooling water enters the cooling chamber 11 through the cold water pipe 2, it exchanges heat with the fixed mold 8 in advance. During the continued flow of the cooling water, the flow of cooling water provides power to the drive component 9, and the drive component 9 drives the gate extrusion component 10, accelerating the flow speed of the cooling water when cooling the gate position, ensuring that the gate position has been sufficiently cooled when the mold is opened.

[0040] Reference Figure 3 , Figure 5 and Figure 8As one embodiment of the present invention, specifically, a spacer 81 is installed on the inner wall of the fixed mold 8. The spacer 81 is used to form the shape of a high-crystallinity plastic product in the fixed mold 8. A plurality of columns 82 are installed between the outer periphery of the fixed mold 8 and the inner periphery of the limiting frame 3. The columns 82 are used to fix the fixed mold 8 inside the limiting frame 3. The side wall of the fixed mold 8 is constructed with conical inlets 83 in the same number as the spacer 81. The spacer 81 is constructed with a cooling channel 84 inside. The cooling channel 84 increases the heat exchange area between the cooling water and the fixed mold 8, improves the cooling efficiency of the high-crystallinity plastic product, and the plastic product in contact with the spacer 81 can be uniformly cooled. The cooling water enters the cooling channel 84 through the conical inlets 83. The cooling channel 84 extends to the side wall of the fixed mold 8. A short connector 71 is attached to the side wall of the fixed mold 8. The end of the short connector 71 is connected to the return pipe 7, and the end of the cooling channel 84 is located inside the short connector 71. The water flowing out of the cooling channel 84 flows into the return pipe 7 through the short connector 71.

[0041] Reference Figure 4 and Figure 7 As one embodiment of the present invention, specifically, the conical connecting seat 12 has a spiral channel 121 inside, and the conical connecting seat 12 also has a transmission groove 122 extending into the disk 6. Under the action of the spiral channel 121 and the transmission groove 122, cooling water enters the conical connecting seat 12 through the spiral channel 121 to cool the gate part of the high crystallinity plastic product.

[0042] Reference Figure 4 In one embodiment of the present invention, the drive assembly 9 specifically includes a first swivel blade 91, a rotating shaft 92, a transmission shaft 93, and a second swivel blade 94. The rotating shaft 92 is rotatably mounted on the inner wall of the limiting frame 3. The first swivel blade 91 is mounted on the end of the rotating shaft 92 and is disposed in the conical inlet 83. The transmission shaft 93 is rotatably connected to the conical connecting seat 12, and the end of the transmission shaft 93 near the rotating shaft 92 is connected to the rotating shaft 92 through a bevel gear set. The second swivel blade 94 is mounted on the outer periphery of the transmission shaft 93 and is disposed in the inlet of the spiral channel 121. When cooling water flows into the conical inlet 83, the water flow drives the first swivel blade 91 to rotate. The first swivel blade 91 drives the rotating shaft 92 to rotate. The rotating shaft 92 drives the transmission shaft 93 and the second swivel blade 94 on the outer periphery of the transmission shaft 93 to rotate through the bevel gear set. When the second swivel blade 94 rotates, it accelerates the flow speed of the cooling water entering the spiral channel 121, thereby improving the cooling efficiency of the gate part of the high crystallinity plastic product.

[0043] Reference Figure 4 and Figure 6In one embodiment of the present invention, the gate extrusion assembly 10 specifically includes a threaded rod 101, a slider 102, an extrusion ring 103, and an annular bar 104. The threaded rod 101 is rotatably mounted in the transmission groove 122, and the end of the threaded rod 101 is connected to the transmission shaft 93 through a bevel gear set. The end of the threaded rod 101 extends into the arc-shaped guide groove 61. The slider 102 is slidably fitted in the transmission groove 122, and the slider 102 is threadedly connected to the threaded portion of the threaded rod 101. When the transmission shaft 93 rotates, the transmission shaft 93 drives the threaded rod 101 to rotate through the bevel gear set. When the threaded rod 101 rotates, it drives the slider 102. The extrusion ring 103 is set in the arc-shaped guide groove 61 and moves horizontally along the transmission groove 122. When the slider 102 moves, it drives the extrusion ring 103 to move horizontally along the arc-shaped guide groove 61. The end of the slider 102 is connected to the outer circumference of the extrusion ring 103. The annular strip 104 is installed on the inner circumference of the extrusion ring 103. When the extrusion ring 103 moves horizontally towards the fixed mold 8 along the arc-shaped guide groove 61, it extrudes the raw material at the gate, reducing the diameter of the gate. This not only improves the cooling efficiency at the gate, but also ensures that there is sufficient raw material at the gate position, preventing the gate from collapsing due to insufficient raw material, and greatly improving the injection molding quality of high-crystallinity plastic products.

[0044] Reference Figure 4 and Figure 7 As one embodiment of the present invention, specifically, the conical connecting seat 12 has a connecting groove 123 extending into the fixed mold 8, and the connecting groove 123 is connected to the conical inlet 83. The end of the connecting groove 123 extending into the fixed mold 8 and the connection position of the conical inlet 83 is located on the side of the first swivel 91 near the spacer 81. The cooling water in the spiral channel 121 after cooling at the gate position enters the cooling channel 84 through the connecting groove 123 and participates in the circulation of cooling water in the cooling channel 84 from the side of the first swivel 91 near the spacer 81. The cooling water exchanges heat with the high crystallinity plastic product through the spacer 81.

[0045] Reference Figure 4 and Figure 5 As one embodiment of the present invention, specifically, the diameter of the conical inlet 83 near the cooling channel 84 is smaller than the diameter of the end near the disk 6. When the cooling water flows into the conical inlet 83, the pressure of the cooling water entering the cooling channel 84 is increased under the action of the change in the cross-sectional area of ​​the conical inlet 83, thereby providing sufficient pressure for the rotation of the first blade 91.

[0046] Reference Figure 4In one embodiment of the present invention, the sealing sheet 31 is specifically set as a silicone sheet, and the silicone sheet is located on the side of the column 82 near the disk 6. When a large amount of cooling water flows into the cooling chamber 11, the silicone sheet deforms and expands, and the volume of the cooling chamber 11 increases. After the subsequent cooling is completed, the silicone sheet reverses and resets to draw the water in the cooling channel 84 into the cooling chamber 11, so that there is no residual cooling water in the cooling channel 84. The return flow of the cooling water drives the first swivel blade 91 to rotate in the opposite direction, thereby driving the gate extrusion assembly 10 to return to the initial state.

[0047] Reference Figure 4 As one embodiment of the present invention, specifically, the diameter of the first vane 91 near the disk 6 is greater than the diameter of the end near the fixed mold 8. When the cooling water just enters the conical inlet 83, it can drive the first vane 91 to rotate, thereby driving the rotating shaft 92 to rotate, and then quickly driving the threaded rod 101 in the gate extrusion assembly 10 to rotate.

[0048] Working principle: After the high-crystallinity plastic product is injection molded, cooling water with a certain pressure is introduced into the cooling chamber 11 through the cold water pipe 2. The cooling water squeezes the silicone sealing sheet 31 to expand and deform. Then, when the cooling water enters the cooling channel 84 through the conical inlet 83, the flowing cooling water provides power to the drive component 9, which in turn provides power to the gate extrusion component 10. At the same time, the second blade 94 rotates at the inlet of the spiral channel 121, accelerating the flow speed of the cooling water in the spiral channel 121, so that the gate position of the high-crystallinity plastic product is cooled quickly. Meanwhile, the extrusion ring 103 moves horizontally along the arc-shaped guide groove 61, squeezing the raw material at the gate position, making the gate position dense. The cooling water flowing out of the spiral channel 121 flows into the cooling channel 84, ensuring the cooling speed of the high-crystallinity plastic product.

[0049] Specifically, after the cooling water enters the conical inlet 83, it drives the first swivel blade 91 to rotate. This, in turn, causes the shaft 92 to drive the transmission shaft 93 to rotate via a bevel gear set. This, in turn, causes the transmission shaft 93 to drive the second swivel blade 94 to rotate. Under the action of the second swivel blade 94 rotating at the inlet of the spiral channel 121, the speed of the cooling water entering the spiral channel 121 is increased. Furthermore, the transmission shaft 93 also drives the threaded rod 101 to rotate via the bevel gear set. When the threaded rod 101 rotates, it drives the slider 102 along the transmission groove 122 towards the arc-shaped guide groove 6. 1. The edge moves until the edge of the extrusion ring 103 fits against the arc-shaped guide groove 61. When the extrusion ring 103 moves, the extrusion ring 103 and the ring bar 104 work together to push the excess material at the gate towards the fixed mold 8 side, thereby ensuring the compactness of the gate part of the high crystallinity plastic product and ensuring the injection molding quality of the high crystallinity plastic product. The cooling water in the spiral channel 121 flows into the cooling channel 84 through the connecting groove 123, and then flows into the short connector 71 from the edge of the cooling channel 84 and gathers to flow into the return water pipe.

[0050] After the cooling operation is completed, the silicone sealing sheet 31 is reset, and the volume of the cooling chamber 11 becomes smaller. Therefore, the small amount of cooling water remaining in the cooling channel 84 is drawn into the cooling chamber 11. At the same time, when the cooling water flows from the conical inlet 83 into the cooling chamber 11, it drives the first vane 91 to rotate in the opposite direction. Then, the rotating shaft 92 drives the threaded rod 101 to rotate in the opposite direction through the transmission shaft 93, and resets the extrusion ring 103 to the initial position.

[0051] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A cooling system for an injection molding machine used in the production of plastic products, which is used in conjunction with an injection molding machine including an injection unit (1), a moving mold (4), a limiting rod (5), and a return pipe (7), characterized in that: The system includes a cold water pipe (2), a limiting frame (3), a disc (6), a fixed mold (8), a drive assembly (9), a gate extrusion assembly (10), a cooling cavity (11), and a conical connecting seat (12). The limiting frame (3) is installed on the outer periphery of the limiting rod (5), the cold water pipe (2) is connected to the limiting frame (3), the disc (6) is installed at the center of the limiting frame (3), and the inner periphery of the disc (6) is constructed with an arc-shaped guide groove (61). The fixed mold (8) is located inside the limiting frame (3), and a sealing sheet (31) is sealed between the outer periphery of the fixed mold (8) and the inner periphery of the limiting frame (3). The drive assembly (9) is installed between the fixed mold (8) and the limiting frame (3). Between the limiting frame (3), the fixed mold (8) and the sealing plate (31), the cooling cavity (11) is set between the limiting frame (3), the fixed mold (8) and the sealing plate (31), the conical connecting seat (12) is connected between the fixed mold (8) and the limiting frame (3), the gate extrusion assembly (10) is installed between the disc (6) and the conical connecting seat (12), and the gate extrusion assembly (10) is connected to the drive assembly (9). When the cooling water flows into the cooling cavity (11) through the cold water pipe (2), the drive assembly (9) inputs power to the gate extrusion assembly (10). The gate extrusion assembly (10) moves in contact with the arc-shaped guide groove (61), and the drive assembly (9) accelerates the flow of cooling water in the conical connecting seat (12).

2. The cooling system of the injection molding machine for producing plastic products according to claim 1, characterized in that: The inner wall of the fixed mold (8) is equipped with partition strips (81), and multiple columns (82) are installed between the outer periphery of the fixed mold (8) and the inner periphery of the limiting frame (3). The side wall of the fixed mold (8) is constructed with conical inlets (83) in the same number as the partition strips (81). The partition strips (81) are constructed with cooling channels (84) inside. The cooling channels (84) extend to the side wall of the fixed mold (8). The side wall of the fixed mold (8) is fitted with a short connector (71). The end of the short connector (71) is connected to the return pipe (7), and the end of the cooling channel (84) is located inside the short connector (71).

3. The cooling system of the injection molding machine for producing plastic products according to claim 2, characterized in that: The conical connector (12) has a spiral channel (121) inside, and a transmission groove (122) extending into the disk (6) is also constructed inside the conical connector (12).

4. The cooling system of the injection molding machine for producing plastic products according to claim 3, characterized in that: The drive assembly (9) includes a first blade (91), a rotating shaft (92), a transmission shaft (93), and a second blade (94). The rotating shaft (92) is rotatably mounted on the inner wall of the limiting frame (3). The first blade (91) is mounted on the end of the rotating shaft (92) and is located in the conical inlet (83). The transmission shaft (93) is rotatably connected to the conical connecting seat (12), and the end of the transmission shaft (93) near the rotating shaft (92) is connected to the rotating shaft (92) through a bevel gear set. The second blade (94) is mounted on the outer periphery of the transmission shaft (93) and is located in the inlet of the spiral channel (121).

5. The cooling system of the injection molding machine for producing plastic products according to claim 3, characterized in that: The gate extrusion assembly (10) includes a threaded rod (101), a slider (102), an extrusion ring (103), and an annular bar (104). The threaded rod (101) is rotatably mounted in the transmission groove (122), and the end of the threaded rod (101) is connected to the transmission shaft (93) through a bevel gear set. The end of the threaded rod (101) extends into the arc-shaped guide groove (61). The slider (102) slides and fits in the transmission groove (122), and the slider (102) is threadedly connected to the threaded part of the threaded rod (101). The extrusion ring (103) is disposed in the arc-shaped guide groove (61), and the end of the slider (102) is connected to the outer circumference of the extrusion ring (103). The annular bar (104) is installed on the inner circumference of the extrusion ring (103).

6. The cooling system of the injection molding machine for producing plastic products according to claim 5, characterized in that: The conical connecting seat (12) has an internal structure with a connecting groove (123) extending into the fixed mold (8), and the connecting groove (123) is connected to the conical inlet (83).

7. The cooling system of the injection molding machine for producing plastic products according to claim 6, characterized in that: The connection point between the connecting groove (123) and the conical inlet (83) is located on the side of the first swirl vane (91) near the spacer (81).

8. The cooling system of the injection molding machine for producing plastic products according to claim 7, characterized in that: The diameter of the conical inlet (83) near the cooling channel (84) is smaller than the diameter of the inlet near the disk (6).

9. The cooling system of the injection molding machine for producing plastic products according to claim 2, characterized in that: The sealing sheet (31) is a silicone sheet, and the silicone sheet is located on the side of the column (82) near the disk (6).

10. The cooling system of the injection molding machine for producing plastic products according to claim 7, characterized in that: The diameter of the first blade (91) near the disk (6) is greater than the diameter of the end near the fixed mold (8).

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