Cooling structure of tubular product injection mold

Abstract

The utility model provides a tubular product injection mold cooling structure which comprises an upper mold core, a lower mold core and a mold core, and the upper mold core abuts against the lower mold core. A mold core penetrates through the center of the lower mold core and penetrates through the lower mold core to extend into a groove formed in the upper mold core. The upper mold core, the lower mold core and the mold core are connected to form a mold cavity. The upper mold core is provided with a first cooling system, the mold core is provided with a second cooling system, the first cooling system is arranged around the periphery of the mold cavity, and the second cooling system is arranged along the center of the mold core. The first cooling system comprises a first drainage groove and first flow channels, the first drainage groove is formed in the side, away from the lower mold core, of the upper mold core, the first flow channels are arranged around the mold cavity in an array mode, and the first flow channels are communicated through the first drainage groove. Through the first cooling system and the second cooling system, products can be rapidly cooled, uniform shrinkage of the products is ensured, warping or deformation of the products is avoided, the quality of the products is improved, and the production efficiency is improved.

Description

Technical Field

[0001] This utility model belongs to the field of injection mold technology, specifically relating to a cooling structure for injection molds of tubular products. Background Technology

[0002] Injection molding is a highly efficient and precise process for manufacturing complex shapes. The resulting products are lightweight, low-cost, and have high production efficiency, making it commonly used for producing various plastic pipes and connectors. During injection molding, the mold needs to be cooled and solidified before opening to ensure the product has sufficient strength and shape accuracy. Existing injection molds typically have cooling pipes located on the upper and lower sides of the mold cavity. Cooling water is injected from one side of the mold, carrying away heat from the product and exiting from the other side. This arrangement results in cooling pipes being relatively far from the product, leading to a long heat conduction path. Because heat is concentrated in the core area, the product cools from one end to the other, easily creating a temperature gradient, causing uneven shrinkage, and potentially leading to warping or deformation.

[0003] Therefore, the above problems urgently need to be solved. Utility Model Content

[0004] Purpose of the utility model: In order to overcome the above shortcomings, this utility model provides a cooling structure for tubular product injection molds, which simultaneously cools the inner and outer sides of the mold cavity, reduces product warping and deformation, and improves product quality.

[0005] Technical Solution: To achieve the above objectives, this utility model provides a cooling structure for an injection mold of tubular products, including an upper mold core, a lower mold core, and a mold core, with the upper and lower mold cores abutting each other. The mold core passes through the center of the lower mold core, and extends through the lower mold core into a groove provided in the upper mold core. The upper mold core, lower mold core, and mold core are connected to form a mold cavity. The upper mold core is provided with a first cooling system, and the mold core is provided with a second cooling system. The first cooling system is arranged around the outer periphery of the mold cavity, and the second cooling system is arranged along the center of the mold core. The first cooling system includes a first drainage groove and a first flow channel. The first drainage groove is located on the side of the upper mold core away from the lower mold core, and the first flow channel is arranged in an array around the mold cavity. The first drainage groove connects the first flow channel. This utility model is used for injection molding of tubular products. During injection molding, the mold is closed to form a mold cavity, molten plastic is injected into the mold cavity, and after holding pressure and cooling, the mold is separated. During the cooling process, cooling water is injected into the first cooling system to remove heat from the outer periphery of the mold cavity, and cooling water is injected into the second cooling system to remove heat from the mold core, so that the product can be cooled down quickly, ensuring uniform shrinkage of the product, avoiding warping or deformation of the product, improving product quality and increasing production efficiency.

[0006] Furthermore, in the aforementioned cooling structure for tubular product injection molds, the first flow channel includes a tube section and a head. A partition plate is connected along the tube section's axis, dividing the tube section into two chambers. The end of the partition plate furthest from the head is flush with the opening of the first drainage channel. The partition plate divides the tube section into two chambers. Coolant flows into the first drainage channel through cooling pipes provided on the upper mold plate, entering from the tube section chamber on one side of the partition plate, then turning at the head and flowing out on the other side of the partition plate, flowing back into the first drainage channel, and then into the other first flow channel. It again flows from one side of the partition plate, turning at the head, and repeating this serpentine flow pattern to carry away heat from the outer periphery of the mold cavity. This allows the first flow channel to be located in the heat core area, improving cooling efficiency.

[0007] Furthermore, in the above-mentioned tubular product injection mold cooling structure, in order to ensure the separation of the two sides of the partition plate, the partition plate is arranged radially along the mold core, and the two sides of the partition plate abut against the side wall of the first drainage groove respectively.

[0008] Furthermore, in the aforementioned cooling structure of the tubular product injection mold, the second cooling system includes a first guide block, a middle guide block, and a second guide block. These blocks are sequentially connected from the upper mold core to the lower mold core within a cavity in the mold core. A cover plate is located on the side of the second guide block away from the first guide block, sealingly connecting the cover plate to the mold core. The cover plate abuts against the second guide block. A first groove is located on the outer wall of the first guide block, a middle groove on the outer wall of the middle guide block, and a second groove on the outer wall of the second guide block. The first groove, middle groove, and second groove are connected in a straight line to form a flow channel. The second guide block has a liquid inlet hole, and the middle guide block has a middle flow channel. The liquid inlet hole and the middle flow channel are connected, as are the middle flow channel and the middle groove. The cover plate has a liquid inlet hole, which is connected to the liquid inlet hole. The cover plate has a liquid outlet hole, and a second flow channel is located on the end of the second guide block away from the first guide block, connecting the liquid outlet hole and the second groove.

[0009] During the cooling process, cooling water is injected through the inlet hole and enters the middle flow channel through the inlet through-hole. The cooling water then flows into the middle groove from the middle flow channel. The cooling liquid in the middle groove flows to the first groove and the second groove respectively. After passing through the second flow channel, it flows out through the outlet hole. The cooling water flows out from the middle flow channel, first cooling the middle part of the mold cavity, causing the product to gradually shrink from the middle to both ends, reducing the internal stress of the product and preventing warping and deformation.

[0010] Furthermore, in the aforementioned cooling structure for the tubular product injection mold, a first flow groove is provided at the end of the first guide block away from the second guide block. The first guide block has a second through hole, the middle guide block has a third through hole, and the second guide block has a fourth through hole, which are connected. The liquid outlet and the fourth through hole are also connected. The coolant in the first groove flows into the first flow groove, enters the second through hole, passes through the second, third, and fourth through holes, and then flows out from the liquid outlet, cooling the outer periphery of the first guide block and improving cooling efficiency.

[0011] Furthermore, in the above-mentioned cooling structure of the tubular product injection mold, the first drainage block has a first central hole at its center, the middle drainage block has a second central hole, and the second drainage block has a third central hole at its center. The first central hole, the second central hole, and the third central hole are connected to form a channel through which the ejector pin passes.

[0012] Furthermore, in the aforementioned cooling structure for the tubular product injection mold, a first sealing ring is provided along the outer periphery of the first drainage groove. The upper mold core and the upper mold plate are connected, and the upper mold core and the upper mold plate abut against each other. The first sealing ring forms a sealed connection between the upper mold plate and the first drainage groove to prevent coolant from overflowing.

[0013] As can be seen from the above technical solution, this utility model has the following beneficial effects: The cooling structure of the tubular product injection mold of this utility model, by injecting cooling water into the first cooling system to remove heat from the outer periphery of the mold cavity and injecting cooling water into the second cooling system to remove heat from the mold core, enables the product to cool down rapidly, ensuring uniform shrinkage of the product, avoiding warping or deformation, improving product quality, and increasing production efficiency. After the cooling water flows out from the central runner, it flows to both ends, causing the product to gradually shrink from the middle to both ends, reducing internal stress and preventing warping and deformation. Attached Figure Description

[0014] Figure 1 This is a front view of the cooling structure of the tubular product injection mold of this utility model;

[0015] Figure 2 This is a schematic diagram of the cooling structure of the tubular product injection mold of this utility model;

[0016] Figure 3 This is a top view of the cooling structure of the tubular product injection mold of this utility model;

[0017] Figure 4 This is a bottom view of the cooling structure of the tubular product injection mold of this utility model;

[0018] Figure 5 for Figure 3 The sectional view shown in section A;

[0019] Figure 6 This is an exploded view of the second cooling system;

[0020] Figure 7 This is a schematic diagram of the structure of the second drainage block.

[0021] In the diagram: 1. Upper mold core; 11. First cooling system; 111. First runner groove; 112. First flow channel; 1121. Pipe section; 1122. Head; 1123. Partition plate; 113. First sealing ring; 2. Lower mold core; 3. Mold core; 4. Mold cavity; 31. Second cooling system; 311. First runner block; 3111. First groove; 3112. First flow channel; 3113. Second through hole; 3 114. First central hole; 312. Central guide block; 3121. Central groove; 3122. Central flow channel; 3123. Third through hole; 3124. Second central hole; 313. Second guide block; 3131. Second groove; 3132. Liquid inlet through hole; 3133. Fourth through hole; 3134. Third central hole; 3135. Second flow channel; 314. Cover plate; 3141. Liquid inlet hole; 3142. Liquid outlet hole. Detailed Implementation

[0022] Example 1

[0023] like Figure 1-4 The diagram illustrates a cooling structure for a tubular injection mold, comprising an upper mold core 1, a lower mold core 2, and a mold core 3, with the upper mold core 1 and lower mold core 2 abutting each other. The mold core 3 passes through the center of the lower mold core 2 and extends into a groove in the upper mold core 1. The upper mold core 1, lower mold core 2, and mold core 3 are connected to form a mold cavity 4. The upper mold core 1 is provided with a first cooling system 11, and the mold core 3 is provided with a second cooling system 31. The first cooling system 11 is arranged around the outer periphery of the mold cavity 4, and the second cooling system 31 is arranged along the center of the mold core 3. The first cooling system 11 includes a first flow channel 111 and a first flow path 112. The first flow channel 111 is located on the side of the upper mold core 1 away from the lower mold core 2, and the first flow path 112 is arranged in an array around the mold cavity 4, with the first flow channel 111 connecting the first flow path 112. The first flow channel 111 is annular, and the first flow path 112 is arranged along the mold cavity 4.

[0024] like Figure 5The cooling structure of the tubular injection mold shown includes a first flow channel 112 comprising a tube section 1121 and a head section 1122. A partition plate 1123 is connected to the tube section 1121 along its axis, dividing the tube section 1121 into two chambers. The end of the partition plate 1123 furthest from the head section 1122 is flush with the opening of the first drainage channel 111. Coolant flows into the first drainage channel 111 through a cooling pipe provided in the upper mold plate, enters the tube section 1121 chamber on one side of the partition plate 1123, flows into the head section 1122, flows into the other side of the partition plate 1123, flows back into the first drainage channel 111, and then into the other tube section 1121, repeating this serpentine flow pattern to carry away heat from the outer periphery of the mold cavity 4. This allows the first flow channel 112 to be located in the heat core area, improving cooling efficiency.

[0025] In this embodiment, in order to ensure that the two sides of the partition 1123 are separated, the partition 1123 is arranged radially along the mold core 3, and the two sides of the partition 1123 abut against the side wall of the first drainage groove 111 respectively.

[0026] like Figure 5-7 The cooling structure of the tubular injection mold shown includes a second cooling system 31 comprising a first guide block 311, a middle guide block 312, and a second guide block 313. These blocks are sequentially connected from the upper mold core 1 to the lower mold core 2 within the cavity of the mold core 3. A cover plate 314 is provided on the side of the second guide block 313 away from the first guide block 311. The cover plate 314 and the mold core 3 are sealed together, and the cover plate 314 abuts against the second guide block 313. A first groove 3111 is provided on the outer wall of the first guide block 311, a middle groove 3121 is provided on the outer wall of the middle guide block 312, and a second groove 3131 is provided on the outer wall of the second guide block 313. The first groove 3111, the middle groove 3121, and the second groove 3131 are connected in a straight line to form a flow channel. The second diversion block 313 is provided with a liquid inlet through hole 3132, and the middle diversion block 312 is provided with a middle flow channel 3122. The liquid inlet through hole 3132 and the middle flow channel 3122 are connected, and the middle flow channel 3122 and the middle groove 3121 are connected. The cover plate 314 is provided with a liquid inlet hole 3141, and the liquid inlet hole 3132 are connected. The cover plate 314 is provided with a liquid outlet hole 3142, and the second diversion block 313 is provided with a second flow channel 3135 at the end away from the first diversion block 311. The second flow channel 3135 connects the liquid outlet hole 3142 and the second groove 3131. To ensure accurate positioning of the first groove 3111, the middle groove 3121, and the second groove 3131, the first drain block 311, the middle drain block 312, the second drain block 313, and the cover plate 314 are respectively provided with positioning holes. Positioning pins are inserted into the positioning holes to position the first drain block 311, the middle drain block 312, the second drain block 313, and the cover plate 314. There are two positioning holes.

[0027] In this embodiment, the first guide block 311 has a first flow groove 3112 at the end away from the second guide block 313. The first guide block 311 has a second through hole 3113, the middle guide block 312 has a third through hole 3123, and the second guide block 313 has a fourth through hole 3133. The second through hole 3113, the third through hole 3123, and the fourth through hole 3133 are connected. The liquid outlet hole 3142 is connected to the fourth through hole 3133.

[0028] In this embodiment, the first drainage block 311 has a first central hole 3114 at its center, the middle drainage block 312 has a second central hole 3124, and the second drainage block 313 has a third central hole 3134 at its center. The first central hole 3114, the second central hole 3124, and the third central hole 3134 are connected to form a channel through which the ejector pin passes.

[0029] In this embodiment, a first sealing ring 113 is provided along the outer periphery of the first drainage groove 111. The upper mold core 1 is connected to the upper template, and the upper mold core 1 and the upper template abut against each other. The first sealing ring 113 makes the upper template and the first drainage groove 111 form a sealed connection to prevent coolant from overflowing.

[0030] The cooling steps of this utility model include: The cooling steps of the first cooling system 11 include: Coolant flows into the first diversion groove 111 from one end through the cooling pipe provided on the upper template, flows into the tube section 1121 chamber on one side of the partition plate 1123, enters the head 1122 and then turns to flow out from the other side of the partition plate 1123, flows into the first diversion groove 111 again, and then flows into another first flow channel 112, and flows in a serpentine manner repeatedly, and finally flows out from the cooling pipe provided on the upper template corresponding to the other end of the first diversion groove 111.

[0031] The cooling steps of the second cooling system 31 include: cooling water enters the inlet through-hole 3132 through the cooling pipe provided in the lower template, enters the middle flow channel 3122 through the inlet through-hole 3132, flows from the middle flow channel 3122 into the middle groove 3121, the cooling water in the middle groove 3121 flows into the first groove 3111 and the second groove 3131 respectively, the cooling water flowing out of the second groove 3131 flows into the second flow channel 3135, and flows out from the outlet hole 3142. The cooling water flowing out of the first groove 3111 flows into the first flow channel 3112, enters the second through-hole 3113, and flows out from the outlet hole 3142 after passing through the second through-hole 3113, the third through-hole 3123 and the fourth through-hole 3133.

[0032] The above embodiments are exemplary and are intended to illustrate the technical concept and features of this utility model, so that those skilled in the art can understand the content of this utility model and implement it accordingly. They should not be construed as limiting the scope of protection of this utility model. All equivalent changes or modifications made in accordance with the spirit and essence of this utility model should be covered within the scope of protection of this utility model.

Claims

1. A cooling structure for a tubular product injection mold, characterized in that: The mold includes an upper mold core (1), a lower mold core (2), and a mold core (3), wherein the upper mold core (1) and the lower mold core (2) abut against each other; the mold core (3) is inserted through the center of the lower mold core (2), and the mold core (3) extends through the lower mold core (2) into a groove provided in the upper mold core (1); the upper mold core (1), the lower mold core (2), and the mold core (3) are connected to form a mold cavity (4); the upper mold core (1) is provided with a first cooling system (11), and the mold core (3) is provided with a second cooling system (31). The first cooling system (11) is arranged around the outer periphery of the mold cavity (4), and the second cooling system (31) is arranged along the center of the mold core (3). The first cooling system (11) includes a first flow channel (111) and a first flow channel (112). The first flow channel (111) is located on the side of the upper mold core (1) away from the lower mold core (2). The first flow channel (112) is arranged in an array around the mold cavity (4). The first flow channel (111) connects the first flow channel (112).

2. The cooling structure for tubular product injection molds according to claim 1, characterized in that: The first flow channel (112) includes a tube (1121) and a head (1122). The tube (1121) is connected to a partition plate (1123) along the axis. The partition plate (1123) divides the tube (1121) into two chambers. The end of the partition plate (1123) away from the head (1122) is flush with the opening of the first drainage groove (111).

3. The cooling structure for tubular product injection molds according to claim 2, characterized in that: The partition plate (1123) is arranged radially along the mold core (3), and the two sides of the partition plate (1123) abut against the side wall of the first drainage groove (111).

4. The cooling structure for tubular product injection molds according to claim 1, characterized in that: The second cooling system (31) includes a first guide block (311), a middle guide block (312), and a second guide block (313). The first guide block (311), the middle guide block (312), and the second guide block (313) are sequentially connected to the cavity provided in the mold core (3) from the upper mold core (1) to the lower mold core (2). A cover plate (314) is provided on the side of the second guide block (313) away from the first guide block (311). The cover plate (314) and the mold core (3) are sealed together, and the cover plate (314) and the second guide block (313) abut against each other. A first groove (3111) is provided on the outer wall of the first guide block (311), a middle groove (3121) is provided on the outer wall of the middle guide block (312), and a second groove (3131) is provided on the outer wall of the second guide block (313). The first and second grooves (3111, 3121, and 3131) are connected in a straight line to form a flow channel; the second flow block (313) is provided with an inlet hole (3132), the first flow block (312) is provided with a flow channel (3122), the inlet hole (3132) and the flow channel (3122) are connected, and the flow channel (3122) and the groove (3121) are connected; the cover plate (314) is provided with an inlet hole (3141), the inlet hole (3141) and the inlet hole (3132) are connected; the cover plate (314) is provided with an outlet hole (3142), and the second flow block (313) is provided with a second flow channel (3135) at the end away from the first flow block (311), and the second flow channel (3135) connects the outlet hole (3142) and the second groove (3131).

5. The cooling structure for tubular product injection molds according to claim 4, characterized in that: The first flow block (311) is provided with a first flow groove (3112) at the end away from the second flow block (313), and the first flow block (311) is provided with a second through hole (3113). The first flow groove (3112) connects the first groove (3111) and the second through hole (3113). The middle flow block (312) is provided with a third through hole (3123), and the second flow block (313) is provided with a fourth through hole (3133). The second through hole (3113), the third through hole (3123) and the fourth through hole (3133) are connected. The liquid outlet hole (3142) and the fourth through hole (3133) are connected.

6. The cooling structure for tubular product injection molds according to claim 4, characterized in that: The first drainage block (311) has a first central hole (3114) at its center, the middle drainage block (312) has a second central hole (3124), and the second drainage block (313) has a third central hole (3134) at its center. The first central hole (3114), the second central hole (3124), and the third central hole (3134) are connected to form a channel through which the ejector pin passes.

7. The cooling structure for tubular product injection molds according to claim 2, characterized in that: A first sealing ring (113) is provided along the outer periphery of the first drainage groove (111).

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