Injection molding device with out-of-mold cooling and demoulding

Abstract

The present invention relates to an injection molding device with off-mold cooling and demolding, which is used for injection molding a plastic part with an inner cavity. The injection molding device comprises an injection mold, and the injection mold comprises a lower mold base, a lower mold core, an upper mold base and an upper mold core. The injection mold also comprises an insert, and the insert has an inner cavity forming block for forming the inner cavity of the plastic part. The insert is detachably installed in the lower mold base and / or the lower mold core, and the inner cavity forming block is located in the lower mold core; the injection molding device also comprises a demolding push rod and a cooling demolding mechanism, the demolding push rod is movably arranged in the insert, and the front end of the demolding push rod passes through the inner cavity forming block and the rear end extends out of the insert; the cooling demolding mechanism comprises a cooling demolding frame and a thrust block, and the cooling demolding frame is provided with a demolding station for placing the insert, and after the insert is positioned and placed on the demolding station, the rear end of the demolding push rod is opposite to the thrust block; the thrust block can move toward the demolding station.

Description

Technical Field

[0001] The invention relates to the field of injection molds, and in particular to an injection molding device with out-of-mold cooling and demoulding. Background Art

[0002] The connector is the relay station of the wiring harness in the automobile circuit. Figure 1 and attached Figure 1 , which mainly includes a plastic part 1 made of insulating plastic material, and often has an insert 2 therein. The plastic part 1 is manufactured by injection molding and wraps the insert 2. In the plastic part 1, there is often an inner cavity 1a for plugging in. The side wall of the inner cavity 1a has very high requirements on the size, because the size of the inner cavity 1a is the primary condition for the connector to be connected with other docking products and to ensure reliable and uninterrupted connection. However, when the plastic part 1 is made by injection molding, it will be affected by the thermal expansion and contraction of the high-temperature molten plastic. There is a shrinkage error between the mold size and the product size. For products with regular shapes such as round and square shapes, the shrinkage error can be reserved through calculation, but for products with irregular shapes, the shrinkage rate is different at different positions, and this problem cannot be solved by calculation. Therefore, when cooling, the shrinkage of various parts of the plastic part 1 is prone to inconsistency, especially the uneven shrinkage of the side walls of the inner cavity, which will cause the finished product to fail to meet the design requirements and cause the problem of cooling deformation of the injection molded parts. Summary of the invention

[0003] In view of the above-mentioned shortcomings of the prior art, the technical problem to be solved by the present invention is to provide an injection molding device with out-of-mold cooling and demolding, which can cool and demold the plastic parts outside the mold, ensure the size of the inner cavity in the plastic parts, and improve the quality of the injection molded products.

[0004] To achieve the above-mentioned object, the present invention provides an injection molding device with mold-out cooling and demolding, which is used for injection molding a plastic part with an inner cavity. The injection molding device comprises an injection mold, and the injection mold comprises a lower mold base, a lower mold core, an upper mold base and an upper mold core. The lower mold core is fixed to the lower mold base, and the upper mold core is fixed to the upper mold base. The injection mold also comprises an insert, and the insert has an inner cavity forming block for forming an inner cavity of the plastic part. The insert is detachably installed in the lower mold base and / or the lower mold core, and the inner cavity The forming block is located in the lower mold core; the injection molding device also includes a demoulding push rod and a cooling demoulding mechanism, the demoulding push rod is movably arranged in the insert, the front end of the demoulding push rod passes through the inner cavity forming block, and the rear end extends out of the insert; the cooling demoulding mechanism includes a cooling demoulding frame and a thrust block, the cooling demoulding frame is provided with a demoulding station for placing the insert, and after the insert is positioned and placed on the demoulding station, the rear end of the demoulding push rod is opposite to the thrust block; the thrust block can move toward the demoulding station.

[0005] Furthermore, the cooling and demolding mechanism also includes a pressing block fixed to the upper mold base, a chamfered surface is provided at the lower end of the pressing block, and the thrust block is movably arranged on the cooling and demolding frame and located below the chamfered surface. When the pressing block moves downward with the upper mold base, the chamfered surface can be pressed against the thrust block and push the thrust block to move toward the demolding station.

[0006] Furthermore, the thrust block is provided with a roller, and the roller is located below the chamfered surface. When the pressing block moves downward, the chamfered surface presses against the roller.

[0007] Furthermore, the cooling demoulding frame is provided with a limiting structure for limiting the position of the insert.

[0008] Furthermore, the limiting structure includes a limiting column fixed on the cooling demolding frame, and a limiting stop surface. The insert is provided with a limiting groove. When the insert is placed on the demolding station, the limiting column is located in the limiting groove, and the front end of the insert is against the limiting stop surface.

[0009] Further, the insert comprises a main body and an inner cavity forming block, and the inner cavity forming block is detachably mounted on the main body.

[0010] Furthermore, a positioning mounting column is inserted on the main body of the insert, and a positioning mounting hole is provided on the inner cavity forming block, and the positioning mounting hole is sleeved on the positioning mounting column.

[0011] Furthermore, a plastic part used for injection molding a connector, wherein the plastic part is wrapped with an insert, and the insert is located at the bottom of the inner cavity, the main body of the insert includes a positioning block for positioning and installing in the lower mold base, and an injection molding participating block for participating in the injection molding, the inner cavity forming block is located in the injection molding participating block, and during injection molding, the insert is installed on the injection molding participating block and is located at the front end of the inner cavity forming block.

[0012] Furthermore, the insert is provided with an ejector pin, and a avoidance hole is provided at the front end of the demoulding push rod. When the insert is installed on the injection molding participating block, the ejector pin is aligned with the avoidance hole.

[0013] Furthermore, a guide rod is provided on the thrust block, a guide hole is opened on the lower die base, and the guide rod is located in the guide hole.

[0014] As described above, the injection molding device according to the present invention has the following beneficial effects:

[0015] By setting an injection mold with an insert, a demoulding push rod and a cooling demoulding mechanism, during injection molding, the insert is installed in the lower mold base or the lower mold core, and the inner cavity forming block participates in the injection molding work; during injection molding, the plastic part is wrapped on the inner cavity forming block to form an inner cavity there; after the mold is opened, the insert and the plastic part on it are taken out together, and cooled and demoulded on the cooling demoulding mechanism located outside the injection mold, and the insert is placed on the demoulding station of the cooling demoulding frame and positioned, waiting for the cooling of the plastic part. Since the inner cavity side wall part of the plastic part is always wrapped on the inner cavity forming block during the cooling process, and closely matches the inner cavity forming block without gap, there will be no shrinkage inconsistency problem during the cooling process, and the inner cavity size is always consistent with the size of the inner cavity forming block. After cooling, by pushing the thrust block toward the insert on the demoulding station, the thrust block pushes the demoulding push rod to move forward, and the front end of the demoulding push rod extends out of the inner cavity forming block, pushing the plastic part off from the inner cavity forming block, and realizing the demoulding work. The injection molding device of the present invention can smoothly perform the injection molding of plastic parts, and cool and demold the plastic parts outside the mold, thereby avoiding the problem of uneven shrinkage in the inner cavity during cooling, ensuring the size of the inner cavity in the plastic part, and effectively improving the quality of the injection molded product. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 Schematic diagram of the structure of the plastic parts of the connector.

[0017] Figure 2 Schematic diagram of the structure of the insert in the connector.

[0018] Figure 3 It is a schematic structural diagram of the injection molding device of the present invention.

[0019] Figure 4 This is a schematic diagram of the demoulding of the insert on the cooling demoulding mechanism in the present invention, and some structures are omitted in this figure.

[0020] Figure 5 for Figure 4 Top view of the .

[0021] Figure 6 It is a schematic diagram of the structure of the insert in the present invention.

[0022] Component number description

[0023] 1 Plastic parts

[0024] 1a Inner cavity

[0025] 2 Inserts

[0026] 2a Ejector pin

[0027] 3 Lower die base

[0028] 4 Lower mold core

[0029] 5 Upper mold core

[0030] 6 Upper die seat

[0031] 7 Inserts

[0032] 7a Lumen forming block

[0033] 7b Injection molding block

[0034] 7c Limiting groove

[0035] 7d Positioning block

[0036] 7e Positioning column

[0037] 8 Demoulding push rod

[0038] 8a Avoidance hole

[0039] 9 Cooling demoulding frame

[0040] 9a Limit column

[0041] 10 Thrust block

[0042] 10a Scroll wheel

[0043] 11 Briquetting

[0044] 11a Bevel

[0045] 12 Guide rod DETAILED DESCRIPTION

[0046] The following is a description of the implementation of the present invention by means of specific embodiments. Those skilled in the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification.

[0047] It should be noted that the structures, proportions, sizes, etc. drawn in the drawings of this specification are only used to match the contents disclosed in the specification for people familiar with this technology to understand and read, and are not used to limit the limiting conditions for the implementation of the present invention, so they have no substantial technical significance. Any modification of the structure, change of the proportional relationship or adjustment of the size, without affecting the effects and purposes that can be achieved by the present invention, should still fall within the scope of the technical content disclosed by the present invention. At the same time, the terms such as "upper", "lower", "left", "right", "middle" and so on quoted in this specification are only for the convenience of description, and are not used to limit the scope of the implementation of the present invention. The change or adjustment of their relative relationship should also be regarded as the scope of the implementation of the present invention without substantially changing the technical content.

[0048] See also Figures 1 to 6The present invention provides an injection molding device with out-of-mold cooling and demoulding, which is used for injection molding a plastic part 1 having an inner cavity 1a. Figure 1 The plastic part 1 shown is a plastic part in the connector. The inner cavity 1a is used for plugging with other parts. The plastic part 1 is wrapped with an insert 2. The structure of the insert 2 is as follows: Figure 2 shown.

[0049] The injection molding device of the present invention includes an injection mold, which includes a lower mold base 3, a lower mold core 4, an upper mold base 6 and an upper mold core 5. The lower mold core 4 is fixed to the lower mold base 3, and the upper mold core 5 is fixed to the upper mold base 6. The upper mold core 5 moves up and down with the upper mold base 6 to close and open the mold. The main structures and functions of the lower mold base 3, the lower mold core 4, the upper mold base 6 and the upper mold core 5 in the injection mold are existing and will not be described in detail here. The injection mold also includes an insert 7, which has an inner cavity forming block 7a for forming an inner cavity 1a of the plastic part 1. The insert 7 is detachably installed in the lower mold base 3 and / or the lower mold core 4, and the inner cavity forming block 7a is located in the lower mold core 4. The injection molding device also includes a demoulding push rod 8 and a cooling demoulding mechanism. The demoulding push rod 8 is movably arranged in the insert 7, and the front end of the demoulding push rod 8 passes through the inner cavity forming block 7a and the rear end extends out of the insert 7; the cooling demoulding mechanism includes a cooling demoulding frame 9 and a thrust block 10, and the cooling demoulding frame 9 and the thrust block 10 are both located outside the injection mold. A demoulding station for placing the insert 7 is provided on the cooling demoulding frame 9, and after the insert 7 is positioned and placed on the demoulding station, the rear end of the demoulding push rod 8 is opposite to the thrust block 10; the thrust block 10 can move toward the demoulding station and push the demoulding push rod 8 in the insert 7 located on the demoulding station.

[0050] The basic working principle of the injection molding device of the present invention is as follows: Figure 3 and Figure 4 During injection molding, the insert 7 is installed in the lower mold base 3 or the lower mold core 4, wherein the inner cavity forming block 7a extends into the lower mold core 4 to participate in the injection molding work, and at this time, the demolding push rod 8 retreats to be located in the inner cavity forming block 7a, which does not affect the injection molding. After the mold is closed, the upper mold core 5, the lower mold core 4, and the insert 7 will form an injection cavity for injecting the plastic part 1, and at this time the inner cavity forming block 7a is located in the injection cavity; then the injection molding work is carried out to obtain the plastic part 1 in the injection cavity, and the plastic part 1 is wrapped on the inner cavity forming block 7a to form an inner cavity 1a there. After the mold is opened, the insert 7 and the plastic part 1 thereon are taken out together, and cooled and demolded on the cooling and demolding mechanism located outside the injection mold, see Figure 4 For the convenience of explanation, Figure 4Part of the structure is omitted, and only part of the structure of the insert 7 is shown. Specifically, the insert 7 is placed on the demoulding station of the cooling demoulding frame 9 and positioned. At this time, the rear end of the demoulding push rod 8 in the insert 7 faces the thrust block 10, waiting for the cooling of the plastic part 1. Since the side wall of the inner cavity 1a of the plastic part 1 is always wrapped on the inner cavity forming block 7a during the cooling process, and is tightly matched with the inner cavity forming block 7a without gap, there will be no shrinkage inconsistency problem during the cooling process. The size of the inner cavity 1a is always consistent with the size of the inner cavity forming block 7a, so that the size of the inner cavity 1a obtained after the plastic part 1 is cooled can meet the design requirements. After cooling, demoulding is performed, by pushing the thrust block 10 toward the insert 7 on the demoulding station, the thrust block 10 abuts against the rear end of the demoulding push rod 8, and pushes the demoulding push rod 8 to move forward, the front end of the demoulding push rod 8 extends out of the inner cavity forming block 7a, and then abuts against the plastic part 1, pushing the plastic part 1 off from the inner cavity forming block 7a, and realizing the demoulding work.

[0051] The injection molding device of the present invention can smoothly perform the injection molding of the plastic part 1, and cool and demold the plastic part 1 outside the mold, avoiding the problem of uneven shrinkage in the inner cavity 1a during cooling, ensuring the size of the inner cavity 1a in the plastic part 1, and effectively improving the quality of the injection molded product.

[0052] See also Figures 3 to 6 The present invention is further described below with a specific embodiment:

[0053] In this embodiment, see Figure 1 , Figure 2 and Figure 3 As a preferred design, the cooling demolding mechanism also includes a pressing block 11 fixed to the upper mold base 6. The lower end of the pressing block 11 is provided with a chamfered surface 11a, which faces the lower front direction, that is, toward the demolding station. The thrust block 10 is movably arranged on the cooling demolding frame 9 and is located below the chamfered surface 11a. During the mold closing process, when the pressing block 11 moves downward with the upper mold base 6, the chamfered surface 11a can be pressed against the thrust block 10 and push the thrust block 10 to move toward the demolding station, and then contact and push the demolding push rod 8 to move forward to realize the demolding work. By adopting the above method, the power during mold closing can be used to realize automatic demolding and simplify the mechanism. The injection mold can be used with multiple inserts 7. After the insert 7 is taken out after injection molding, it is cooled and demolded on the cooling demolding frame 9, and another insert 7 is installed in the mold at the same time, so that the next injection work can be carried out immediately, and the mold closing power is used to perform the demolding work while the mold is closed. Of course, in other embodiments, other driving mechanisms may be used to drive the movement of the thrust block 10 .

[0054] In this embodiment, see Figure 3 and Figure 4As a preferred design, the moving block 10 has a roller 10a, which is located below the chamfered surface 11a. When the pressing block 11 moves downward, the chamfered surface 11a presses against the roller 10a. There are two pressing blocks 11, which are respectively located at the left and right ends of the thrust block 10. There is a roller 10a at each of the left and right ends of the thrust block 10, which is respectively located below the two chamfered surfaces 11a. When demolding, the chamfered surface 11a presses on the roller 10a, and the roller 10a rolls when the thrust block 10 is pushed forward, reducing friction and making the entire movement smoother.

[0055] In this embodiment, see Figure 3 and Figure 4 As a preferred design, a limiting structure for limiting the position of the insert 7 is provided on the cooling demolding frame 9. Specifically, the limiting structure includes a limiting column 9a fixed on the cooling demolding frame 9, and a limiting stop surface (not shown in the drawings). A limiting groove 7c is provided on the insert 7. The limiting column 9a is a center column, and the limiting groove 7c is an arc groove, which is arranged at the rear side of the insert 7. When the insert 7 is placed on the demolding station, the limiting column 9a is located in the limiting groove 7c, which can limit the left and right positions of the insert 7, and the front end of the insert 7 is against the limiting stop surface to limit the front position of the insert 7. The limiting structure also plays a positioning role, which is convenient for the placement and positioning of the insert 7 on the demolding station.

[0056] In this embodiment, multiple inserts 7 can be installed in the injection mold at the same time, and the inserts 7 can have multiple inner cavity forming blocks 7a at the same time, so that multiple plastic parts 1 can be produced by injection molding at the same time. In addition, the cooling demolding frame 9 is provided with multiple demolding stations, which can simultaneously place multiple inserts 7, and the thrust block 10 simultaneously pushes multiple demolding push rods 8 to demold the plastic parts 1 on the multiple inserts 7.

[0057] In this embodiment, see Figure 4 The insert 7 includes a main body, and the inner cavity forming block 7a is detachably mounted on the main body, which is convenient for disassembly and replacement. A positioning mounting column 7e is provided on the main body of the insert 7, and a positioning mounting hole is provided on the inner cavity forming block 7a. The inner cavity forming block 7a is sleeved on the positioning mounting column 7e through the positioning mounting hole, thereby stabilizing the position of the inner cavity forming block 7a and facilitating installation. Correspondingly, a strip groove is provided on the demoulding push rod 8 for the positioning mounting column 7e to pass through to avoid interference with the positioning mounting column 7e.

[0058] The injection molding device of the present invention can be used to inject a variety of plastic parts 1 with inner cavities 1a, and can be used to inject plastic parts 1 in connectors, where the inner cavities 1a in the plastic parts 1 are used for plugging with other parts. Figure 1 and Figure 2, the plastic part 1 is wrapped with an insert 2, and the insert 2 is located at the bottom of the inner cavity 1a of the plastic part 1. As a preferred design, the main body includes a positioning block 7d and an injection molding participating block 7b. The positioning block 7d is used to be installed in the lower mold base 3 to play a positioning and installation role. The injection molding participating block 7b extends into the lower mold core 4 to participate in the injection molding. It is provided with a corresponding cavity structure, which together with the corresponding cavity structures on the lower mold core 4 and the upper mold core 5 constitutes an injection molding cavity. The inner cavity forming block 7a is located in the cavity structure of the injection molding participating block 7b. During injection molding, refer to Figure 4 , the insert 2 is installed on the injection molding block 7b and is located at the front end of the inner cavity forming block 7a. After the injection molding is completed, the obtained plastic part 1 wraps the insert 2. For the insert 2 with the ejector pin 2a, see Figure 1 and Figure 2 , the ejector pin 2a of the insert 2 extends into the inner cavity 1a of the plastic part 1. At this time, a corresponding avoidance hole 8a is provided on the front end of the demoulding push rod 8. After the demoulding push rod 8 extends out of the inner cavity to form the block 7a, the avoidance hole 8a is just inserted into the ejector pin 2a, so that the ejector pin 2a will not be damaged by the ejector pin 8 on the plastic part 1.

[0059] In this embodiment, see Figure 3 and Figure 4 As a preferred design, a guide rod 12 is further provided on the thrust block 10. The guide rod 12 is along the front-to-back direction, that is, the movement direction of the thrust block 10. The cooling demolding frame 9 is arranged at the front side of the lower die base 3. A guide hole is provided on the front side surface of the lower die base 3. A guide rod 12 is further provided on the thrust block 10. A guide hole is provided on the lower die base 3. The guide rod 12 is located in the guide hole. The front-to-back movement of the thrust block 10 is guided by the guide rod 12 and the guide hole.

[0060] In summary, the present invention effectively overcomes various shortcomings in the prior art and has high industrial utilization value.

[0061] The above embodiments are merely illustrative of the principles and effects of the present invention, and are not intended to limit the present invention. Anyone familiar with the art may modify or alter the above embodiments without departing from the spirit and scope of the present invention. Therefore, all equivalent modifications or alterations made by a person of ordinary skill in the art without departing from the spirit and technical concept disclosed by the present invention shall still be covered by the claims of the present invention.

Claims

1. An injection molding device with off-mold cooling and demoulding, used for injection molding a plastic part (1) having an inner cavity (1a), the injection molding device comprising an injection mold, the injection mold comprising a lower mold base (3), a lower mold core (4), an upper mold base (6) and an upper mold core (5), the lower mold core (4) being fixed to the lower mold base (3), and the upper mold core (5) being fixed to the upper mold base (6), characterized in that: The injection mold further comprises an insert (7), wherein the insert (7) comprises an inner cavity forming block (7a) for forming an inner cavity (1a) of the plastic part (1), the insert (7) being detachably mounted in the lower mold base (3) and / or the lower mold core (4), and the inner cavity forming block (7a) being located in the lower mold core (4); the injection molding device further comprises a demoulding push rod (8) and a cooling demoulding mechanism, wherein the demoulding push rod (8) is movably arranged on the insert (7) In the embodiment, the front end of the demoulding push rod (8) passes through the inner cavity to form a block (7a), and the rear end extends out of the insert (7); the cooling demoulding mechanism comprises a cooling demoulding frame (9) and a thrust block (10); the cooling demoulding frame (9) is provided with a demoulding station for placing the insert (7), and after the insert (7) is positioned and placed on the demoulding station, the rear end of the demoulding push rod (8) is opposite to the thrust block (10); the thrust block (10) can move toward the demoulding station.

2. The injection molding device according to claim 1, characterized in that: The cooling demoulding mechanism also includes a pressing block (11) fixed to the upper mold base (6), the lower end of the pressing block (11) is provided with a chamfered surface (11a), the thrust block (10) is movably arranged on the cooling demoulding frame (9) and is located below the chamfered surface (11a), and when the pressing block (11) moves downward with the upper mold base (6), the chamfered surface (11a) can be pressed against the thrust block (10) and push the thrust block (10) to move toward the demoulding station.

3. The injection molding device according to claim 2, characterized in that: The thrust block (10) is provided with a roller (10a), and the roller (10a) is located below the chamfered surface (11a). When the pressing block (11) moves downward, the chamfered surface (11a) presses against the roller (10a).

4. The injection molding device according to claim 1, characterized in that: The cooling demoulding frame (9) is provided with a limiting structure for limiting the position of the insert (7).

5. The injection molding device according to claim 4, characterized in that: The limiting structure comprises a limiting column (9a) fixed on a cooling demoulding frame (9) and a limiting stop surface. The insert (7) is provided with a limiting groove (7c). When the insert (7) is placed on the demoulding station, the limiting column (9a) is located in the limiting groove (7c), and the front end of the insert (7) abuts against the limiting stop surface. The limiting column (9a) is used to limit the left-right position of the insert (7).

6. The injection molding device according to claim 1, characterized in that: The insert (7) comprises a main body and an inner cavity forming block (7a), wherein the inner cavity forming block (7a) is detachably mounted on the main body.

7. The injection molding device according to claim 6, characterized in that: A positioning installation column (7e) is inserted on the main body of the insert (7), and a positioning installation hole is provided on the inner cavity forming block (7a), and the positioning installation hole is sleeved on the positioning installation column (7e).

8. The injection molding device according to claim 7, characterized in that: A plastic part (1) for injection molding a connector, wherein an insert (2) is wrapped in the plastic part (1), and the insert (2) is located at the bottom of an inner cavity (1a), the main body of the insert (7) comprises a positioning block (7d) for positioning and mounting in a lower mold base (3), and an injection molding participating block (7b) for participating in injection molding, the inner cavity forming block (7a) is located in the injection molding participating block (7b), and during injection molding, the insert (2) is mounted on the injection molding participating block (7b) and is located at the front end of the inner cavity forming block (7a).

9. The injection molding device according to claim 8, characterized in that: The insert (2) is provided with an ejector pin (2a), the front end of the demoulding push rod (8) is provided with an avoidance hole (8a), and when the insert (2) is mounted on the injection molding participating block (7b), the ejector pin (2a) is aligned with the avoidance hole (8a).

10. The injection molding device according to claim 1, characterized in that: The thrust block (10) is also provided with a guide rod (12), the lower die base (3) is provided with a guide hole, and the guide rod (12) is located in the guide hole.

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