A two-color injection mold for plastic products

Abstract

The application relates to the technical field of injection molds, in particular to a two-color injection mold for plastic products, which comprises a right mold and a left mold. The right mold comprises a right base plate, one side wall of the right base plate is fixedly connected with a right cover plate, one side wall of the right cover plate is provided with a gap slot, and two half molds are arranged in the gap slot. The two half molds are used in cooperation with a pushing connection assembly, the inner walls of the two half molds are provided with grooves or connecting protrusions, the outer wall of the product once injected has the grooves and the protrusions, the inner wall of the product secondly injected has protrusions matched with the grooves or grooves matched with the protrusions, the connection between the materials of the product once injected and the product secondly injected is unstable, but a stable wedge can be formed between the grooves and the protrusions, the materials of the product once injected and the product secondly injected can be stably connected, the limitation on the materials during two-color injection is avoided, and the practicability of two-color injection is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to injection mold technical field, specifically to a kind of double-color injection mold for plastic product. BACKGROUND

[0002] Double-color injection mold is a kind of special mold technology for manufacturing plastic products composed of two different colors or different materials, which is by twice injection of different materials (or same material different color) on the same injection molding machine, finally forming a composite structure of parts, this technology is widely used in consumer electronics, automobile, medical devices, daily necessities and other fields, to improve product functionality and aesthetics.

[0003] One side of double-color injection mold is installed on the rotatable mold plate, after the first injection of film, the mold plate drives the film mold to rotate 180°, and the second injection is carried out, so that after the first injection of film, when the mold plate separates the film, in order to make the first injection product be able to be demoulded smoothly, the outer wall of the first injection product cannot have protrusion or groove, so that the first injection material and the second injection material are limited, only two materials have certain adhesion, can be used for double-color injection, otherwise the materials of twice injection will have the possibility of falling apart, which greatly limits the practicability of double-color injection. SUMMARY

[0004] In view of the deficiencies of the prior art, the present application provides a double-color injection mold for plastic product.

[0005] To achieve the above object, the present application provides the following technical scheme: a double-color injection mold for plastic product, comprising a right mold and a left mold;

[0006] The right mold comprises a right seat plate, and a right cover plate is fixedly connected to one side of the right seat plate, a let slot is formed in one side of the right cover plate, two half molds are arranged in the let slot, a connecting rod is fixedly connected to one side of each half mold, one end of the connecting rod penetrates the right cover plate and extends to one side of the right cover plate, a pushing connection assembly is arranged on one side of the connecting rod on one side of the right cover plate, a spring sheet is fixedly connected to one side of the half mold, a fixed plate is fixedly connected to one end of the spring sheet, the fixed plate is fixedly connected to the inner wall of the let slot, and a mold cavity is formed in one side of the right cover plate.

[0007] Preferably, the pushing connection assembly comprises a push rod fixed rod penetrating the right seat plate, and a wedge block is fixedly connected to one end of the push rod fixed rod; a connecting block is fixedly connected to one end of the connecting rod, a rotating stick is rotatably connected to one side of the connecting block, and the rotating stick is arranged on one side of the wedge block.

[0008] Preferably, the left die includes a left seat plate, and a left cover plate is fixedly connected to one side wall of the left seat plate, four fixing holes are formed in the one side wall of the left cover plate, and a pin die is fixedly connected to the inner wall of the fixing hole, a blanking ejector rod is slidably connected to the inner wall of the pin die, a compression spring is sleeved on the outer wall of the blanking ejector rod, one end of the compression spring is fixedly connected to the blanking ejector rod, the other end of the compression spring is fixedly connected to the pin die, a fixing seat is rotatably connected to the one side wall of the left seat plate, a guide block is fixedly connected to the one side wall of the fixing seat, and one end of the blanking ejector rod penetrates through the left seat plate and extends to the fixing seat.

[0009] Preferably, the driving mechanism includes a motor fixedly connected to the fixing seat, and a gear is fixedly connected to the driving end of the motor, and a ring tooth groove is formed in the one side wall of the left seat plate and engaged with the gear.

[0010] Preferably, the one side wall of the right cover plate is fixedly connected with a connecting plate, and a groove is formed in the one side wall of the connecting plate, and a trimming knife is detachably connected to the inner wall of the groove.

[0011] Preferably, the one side wall of the fixing seat is fixedly connected with a connecting shaft, a bearing is fixedly sleeved on the outer wall of the connecting shaft, and the outer wall of the bearing is fixedly connected with the left seat plate.

[0012] Preferably, a clamping groove is formed in one end of the blanking ejector rod, and a ball is arranged in the clamping groove.

[0013] Preferably, a fixing through hole is formed in the one side wall of the fixing seat.

[0014] Compared with the prior art, the present application has the following beneficial effects:

[0015] In the present application, two half dies are used in cooperation with a pushing connecting assembly, the inner walls of the two half dies are provided with grooves or connecting protrusions, so that the outer wall of the product once injection molded has grooves and protrusions, and the inner wall of the product secondarily injection molded has protrusions matched with the grooves or grooves matched with the protrusions, so that the connection between the materials of the first injection molding and the second injection molding is not stable, but a stable wedge can be formed between the grooves and the protrusions, and the materials of the first injection molding and the second injection molding can be stably connected, avoiding the limitation on the materials during double-color injection molding and improving the practicability of double-color injection molding.

[0016] This invention, through the use of a trimming blade and other components, allows the trimming blade to approach the product after one injection molding during mold closing. This enables the trimming blade to trim the edges of the freshly molded product. Even if overflow occurs between the two mold halves, the trimming blade can neatly trim the edges, preventing the overflow from affecting the second injection molding. Furthermore, this trimming is performed simultaneously with the next product injection, without delaying the injection molding time. Consequently, this device does not compromise injection molding efficiency during trimming.

[0017] In this invention, after the second injection molding is completed, the mold is separated again. Then, the motor drives the product that has been molded in the second injection to rotate. When rotating, one end of the ejector rod contacts the guide block, causing the guide block to push the ejector rod to move. The moving ejector rod pushes the product after the second injection molding to complete the product unloading, which is convenient and quick. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0019] Figure 2 for Figure 1 Enlarged structural diagram at point A;

[0020] Figure 3 This is a schematic diagram of the left mold structure of the present invention;

[0021] Figure 4 This is a schematic diagram of the right mold structure of the present invention;

[0022] Figure 5 for Figure 4 Enlarged structural diagram at point B;

[0023] Figure 6 for Figure 4 Enlarged structural diagram at point C;

[0024] Figure 7 This is a schematic cross-sectional view of the left mold structure of the present invention;

[0025] Figure 8 for Figure 7 Enlarged structural diagram at point D.

[0026] In the diagram: 1. Right seat plate; 2. Right cover plate; 3. Relief groove; 4. Half mold; 5. Connecting rod; 6. Spring plate; 7. Fixing plate; 8. Mold cavity; 9. Push rod fixing rod; 10. Wedge block; 11. Connecting block; 12. Rotating roller; 13. Left seat plate; 14. Left cover plate; 15. Fixing hole; 16. Pin mold; 17. Material ejector rod; 18. Compression spring; 19. Fixing seat; 20. Guide block; 21. Motor; 22. Gear; 23. Ring tooth groove; 24. Connecting plate; 25. Groove; 26. Trimming knife; 27. Connecting shaft; 28. Bearing; 29. ​​Ball bearing; 30. Fixing through hole; 101. Right mold; 102. Left mold. Detailed Implementation

[0027] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.

[0028] Please see Figures 1-8 A two-color injection mold for plastic products, comprising a right mold 101 and a left mold 102;

[0029] The right mold 101 includes a right seat plate 1, and a right cover plate 2 is fixedly connected to one side wall of the right seat plate 1. A relief groove 3 is provided on one side wall of the right cover plate 2, and two half molds 4 are provided in the relief groove 3. A connecting rod 5 is fixedly connected to one side wall of each half mold 4, and one end of the connecting rod 5 passes through the right cover plate 2 and extends to one side of the right cover plate 2. A push connecting assembly is provided on one side of the connecting rod 5 located on one side of the right cover plate 2. A spring plate 6 is fixedly connected to one side wall of the half mold 4, and a fixing plate 7 is fixedly connected to one end of the spring plate 6. The fixing plate 7 is fixedly connected to the inner wall of the relief groove 3. A mold cavity 8 is provided on one side wall of the right cover plate 2.

[0030] As can be seen from the above structure, by setting two half-molds 4 and using them in conjunction with push-connecting components, the inner walls of the two half-molds 4 can be opened with grooves or connecting protrusions. In this way, the outer wall of the product after the first injection molding will have grooves and protrusions. During the second injection molding, the inner wall of the product after the second injection molding will form protrusions that match the grooves or grooves that match the protrusions. This means that even if the connection between the materials of the first injection molding and the second injection molding is unstable, a stable wedge can be formed between the grooves and protrusions, which can also stably connect the materials of the first injection molding and the second injection molding. This avoids the material restrictions in two-color injection molding and improves the practicality of two-color injection molding.

[0031] Furthermore, the push-connecting assembly includes a push rod fixing rod 9 that penetrates the right seat plate 1, and a wedge block 10 is fixedly connected to one end of the push rod fixing rod 9. A connecting block 11 is fixedly connected to one end of the connecting rod 5, and a rotating roller 12 is rotatably connected to one side wall of the connecting block 11. The rotating roller 12 is located on one side of the wedge block 10. By setting the wedge block 10 and the rotating roller 12 to work together, when the push rod pushes the right mold 101 to move and close the mold, the push rod will first push the push rod fixing rod 9 to move. The moving push rod fixing rod 9 pushes the wedge block 10 to move. After the wedge block 10 moves to a certain position, the wedge block 10 contacts the rotating roller 12, so that the wedge block 10 pushes the rotating roller 12 to move. The moving rotating roller 12 drives the connecting rod 5 and the two half molds 4 to move, so that the two half molds 4 can be combined into a complete cavity.

[0032] Furthermore, the left mold 102 includes a left seat plate 13, and a left cover plate 14 is fixedly connected to one side wall of the left seat plate 13. Four fixing holes 15 are provided on one side wall of the left cover plate 14, and a pin mold 16 is fixedly connected to the inner wall of each fixing hole 15. A discharge ejector rod 17 is slidably connected to the inner wall of the pin mold 16, and a compression spring 18 is sleeved on the outer wall of the discharge ejector rod 17. One end of the compression spring 18 is fixedly connected to the discharge ejector rod 17, and the other end of the compression spring 18 is fixedly connected to the pin mold 16. A fixed seat 19 is rotatably connected to one side wall of the left seat plate 13, and one side wall of the fixed seat 19 is fixedly connected to... A guide block 20 is connected to the left seat plate 13, and one end of the ejector rod 17 passes through the left seat plate 13 and extends to one side of the fixed seat 19. A drive mechanism is provided on one side of the fixed seat 19. By setting up the pin mold 16, the compression spring 18 and the guide block 20, after the right mold 101 is reset, the drive mechanism drives the left seat plate 13, the left cover plate 14, the pin mold 16 and the ejector rod 17 to rotate 90 degrees. When the pin mold 16 rotates 90 degrees, one of the pin molds 16 moves to one side of the two half molds 4, and the product that has just been injected once moves to one side of the connecting plate 24. Then the mold is closed again for the next injection.

[0033] Furthermore, the drive mechanism includes a motor 21 fixedly connected to the fixed base 19, and a gear 22 is fixedly connected to the drive end of the motor 21. A ring tooth groove 23 is provided on one side wall of the left base plate 13, and the ring tooth groove 23 meshes with the gear 22. By setting the gear 22 and the ring tooth groove 23 to work together, the motor 21 starts, causing the motor 21 to drive the gear 22 to rotate, and the rotating gear 22 passes through the ring tooth groove 23.

[0034] Furthermore, a connecting plate 24 is fixedly connected to one side wall of the right cover plate 2, and a groove 25 is provided on one side wall of the connecting plate 24. A trimming blade 26 is detachably connected to the inner wall of the groove 25. By setting the trimming blade 26 and other components for use, when the mold is closed, the trimming blade 26 moves closer to the product that has been injected once, so that the trimming blade 26 can trim the edge of the product that has just been injected. In this way, even if there is overflow between the two half molds 4, the trimming blade 26 can trim the edge neatly and avoid the overflowing edge from affecting the second injection.

[0035] Furthermore, a connecting shaft 27 is fixedly connected to one side wall of the fixed base 19, and a bearing 28 is fixedly sleeved on the outer wall of the connecting shaft 27. The outer wall of the bearing 28 is fixedly connected to the left seat plate 13. By setting the connecting shaft 27 and the bearing 28 to work together, the stability of the connection between the fixed base 19 and the left seat plate 13 can be increased.

[0036] Furthermore, a groove is provided at one end of the feeding rod 17, and a ball bearing 29 is provided in the groove; by providing the ball bearing 29, the friction between one end of the feeding rod 17 and the guide block 20 can be reduced.

[0037] Furthermore, a fixing through hole 30 is provided on one side wall of the fixing seat 19; by providing the fixing through hole 30, the left mold 102 can be fixed to one side of the injection molding machine using bolts and the fixing through hole 30.

[0038] Before use, use bolts and fixing through holes 30 to fix the left mold 102 to one side of the injection molding machine. Connect the push rod of the injection molding machine that pushes the right mold 101 to move and close the mold to the push rod fixing rod 9. When in use, when the push rod pushes the right mold 101 to move and close the mold, the push rod will first push the push rod fixing rod 9 to move. The moving push rod fixing rod 9 pushes the wedge block 10 to move. After the wedge block 10 moves to a certain position, the wedge block 10 contacts the rotating roller 12, so that the wedge block 10 pushes the rotating roller 12 to move. The moving rotating roller 12 drives the connecting rod 5 and the two half molds 4 to move, so that the two half molds 4 can be combined into a complete cavity.

[0039] Then the push rod pushes the right mold 101 closer to the left mold 102 to complete the mold closing. After the mold is closed, injection molding and cooling can be performed into the two half molds 4 to produce a product that is injection molded in one go. Then the push rod pulls the push rod fixing rod 9 and the right mold 101 to reset. When the push rod fixing rod 9 is reset, the reset push rod fixing rod 9 first drives the wedge block 10 to reset. When the wedge block 10 is reset, the spring plate 6 pushes the two half molds 4 to separate. After the two half molds 4 are separated, the push rod fixing rod 9 continues to pull the right mold 101 to reset.

[0040] After the right mold 101 is reset, the product that was injected once is fitted onto the outer wall of one of the pin molds 16.

[0041] In this way, grooves or connecting protrusions can be opened on the inner walls of the two half molds 4. Thus, the outer wall of the product after the first injection molding will have grooves and protrusions. During the second injection molding, the inner wall of the product after the second injection molding will form protrusions that match the grooves or grooves that match the protrusions. This means that even if the connection between the materials of the first injection molding and the second injection molding is unstable, the grooves and protrusions can form a stable wedge, which can also stably connect the materials of the first injection molding and the second injection molding. This avoids the material restrictions in two-color injection molding and improves the practicality of two-color injection molding.

[0042] After the right mold 101 is reset, the motor 21 starts, which drives the gear 22 to rotate. The rotating gear 22 drives the left seat plate 13, left cover plate 14, pin mold 16 and ejector rod 17 to rotate 90 degrees through the ring tooth groove 23. When the pin mold 16 rotates 90 degrees, one of the pin molds 16 moves to one side of the two half molds 4. The product that has just been injected into the mold moves to one side of the connecting plate 24. Then the mold is closed again for the next injection. During this mold closing, the trimming knife 26 moves closer to the product that has just been injected into the mold, so that the trimming knife 26 can trim the edge of the product that has just been injected into the mold. In this way, even if there is overflow between the two half molds 4, the trimming knife 26 can trim the edge neatly and avoid the overflowing edge from affecting the second injection.

[0043] Furthermore, since the trimming is carried out simultaneously with the next product injection, the injection time will not be delayed due to the trimming, thus ensuring that the efficiency of the injection is not affected when the device is trimming.

[0044] After the trimming is completed, the right mold 101 and the left mold 102 separate. After the molds are separated, the motor 21 starts, which drives the gear 22 to rotate. The rotating gear 22 drives the left seat plate 13, the left cover plate 14, the pin mold 16 and the ejector pin 17 to rotate 90 degrees again through the ring tooth groove 23. At this time, the product that has just been trimmed moves to one side of the mold cavity 8. When the right mold 101 and the left mold 102 close, the trimmed product will be inserted into the mold cavity 8 for the second injection molding.

[0045] After the second injection molding is completed, the mold is separated again. Then, the motor 21 drives the product that has been injected for the second time to rotate. When rotating, one end of the ejector rod 17 contacts the guide block 20, causing the guide block 20 to push the ejector rod 17 to move. The moving ejector rod 17 pushes the product after the second injection molding to complete the product ejection.

[0046] 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 two-color injection mold for plastic products, comprising a right mold (101) and a left mold (102), characterized in that... ； The right mold (101) includes a right seat plate (1), and a right cover plate (2) is fixedly connected to one side wall of the right seat plate (1). A relief groove (3) is provided on one side wall of the right cover plate (2), and two half molds (4) are provided in the relief groove (3). A connecting rod (5) is fixedly connected to one side wall of each half mold (4), and one end of the connecting rod (5) passes through the right cover plate (2) and extends to one side of the right cover plate (2). A push connection assembly is provided on one side of the connecting rod (5) located on one side of the right cover plate (2). A spring plate (6) is fixedly connected to one side wall of the half mold (4), and a fixing plate (7) is fixedly connected to one end of the spring plate (6). The fixing plate (7) is fixedly connected to the inner wall of the relief groove (3). A mold cavity (8) is provided on one side wall of the right cover plate (2). The push connection assembly includes a push rod fixing rod (9) that passes through the right seat plate (1), and a wedge block (10) is fixedly connected to one end of the push rod fixing rod (9); a connecting block (11) is fixedly connected to one end of the connecting rod (5), and a rotating rod (12) is rotatably connected to one side wall of the connecting block (11), and the rotating rod (12) is located on one side of the wedge block (10). The left mold (102) includes a left seat plate (13), and a left cover plate (14) is fixedly connected to one side wall of the left seat plate (13). Four fixing holes (15) are opened on one side wall of the left cover plate (14), and a pin mold (16) is fixedly connected to the inner wall of the fixing holes (15). A material feeding rod (17) is slidably connected to the inner wall of the pin mold (16), and a compression spring (18) is sleeved on the outer wall of the material feeding rod (17). One end of the compression spring (18) is fixedly connected to the material feeding rod (17), and the other end of the compression spring (18) is fixedly connected to the pin mold (16). A fixed seat (19) is rotatably connected to one side wall of the left seat plate (13), and a guide block (20) is fixedly connected to one side wall of the fixed seat (19). One end of the material feeding rod (17) passes through the left seat plate (13) and extends to one side of the fixed seat (19). A driving mechanism is provided on one side of the fixed seat (19). The driving mechanism includes a motor (21) fixedly connected to the fixed base (19), and a gear (22) is fixedly connected to the driving end of the motor (21). A ring tooth groove (23) is provided on one side wall of the left seat plate (13), and the ring tooth groove (23) meshes with the gear (22). A connecting plate (24) is fixedly connected to one side wall of the right cover plate (2), and a groove (25) is provided on one side wall of the connecting plate (24). A trimming knife (26) is detachably connected to the inner wall of the groove (25). A connecting shaft (27) is fixedly connected to one side wall of the fixed seat (19), and a bearing (28) is fixedly sleeved on the outer wall of the connecting shaft (27). The outer wall of the bearing (28) is fixedly connected to the left seat plate (13). One end of the feeding rod (17) is provided with a slot, and a ball bearing (29) is provided in the slot; The fixing seat (19) has a fixing through hole (30) on one side wall. Before use, use bolts and fixing through holes (30) to fix the left mold (102) to one side of the injection molding machine. Connect the push rod of the injection molding machine that pushes the right mold (101) to move and close the mold with the push rod fixing rod (9). When in use, when the push rod pushes the right mold (101) to move and close the mold, the push rod will first push the push rod fixing rod (9) to move. The moving push rod fixing rod (9) pushes the wedge block (10) to move. After the wedge block (10) moves to a certain position, the wedge block (10) contacts the rotating roller (12), so that the wedge block (10) pushes the rotating roller (12) to move. The moving rotating roller (12) drives the connecting rod (5) and the two half molds (4) to move, so that the two half molds (4) can be combined into a complete cavity. Then the push rod pushes the right mold (101) closer to the left mold (102) to complete the mold closing. After the mold is closed, injection molding and cooling can be performed in the two half molds (4) to produce a product that is injection molded in one go. Then the push rod pulls the push rod fixing rod (9) and the right mold (101) to reset. When the push rod fixing rod (9) is reset, the reset push rod fixing rod (9) first drives the wedge block (10) to reset. When the wedge block (10) is reset, the spring plate (6) pushes the two half molds (4) to separate. After the two half molds (4) are separated, the push rod fixing rod (9) continues to pull the right mold (101) to reset. After the right mold (101) is reset, the product of one injection molding is fitted onto the outer wall of one of the pin molds (16); In this way, grooves or connecting protrusions can be opened on the inner walls of the two half molds (4). In this way, the outer wall of the product injected in one injection will have grooves and protrusions. When the second injection is performed, the inner wall of the product injected in the second injection will form a protrusion that matches the groove or a groove that matches the protrusion. Even if the connection between the materials of the first injection and the second injection is unstable, a stable wedge can be formed between the groove and the protrusion, which can also stably connect the materials of the first injection and the second injection, avoiding the material restrictions in two-color injection and improving the practicality of two-color injection. After the right mold (101) is reset, the motor (21) starts, causing the motor (21) to drive the gear (22) to rotate. The rotating gear (22) drives the left seat plate (13), left cover plate (14), pin mold (16) and ejector rod (17) to rotate 90 degrees through the ring tooth groove (23). When the pin mold (16) rotates 90 degrees, one of the pin molds (16) moves to one side of the two half molds (4), and the product that has just been injected into the outer sleeve moves to one side of the connecting plate (24). Then the mold is closed again for the next injection. During this mold closing, the trimming knife (26) moves closer to the product that has just been injected into the outer sleeve, so that the trimming knife (26) can trim the product that has just been injected into the outer sleeve. In this way, even if there is overflow between the two half molds (4), the trimming knife (26) can trim the edge neatly, avoiding the overflowing edge from affecting the second injection. After the trimming is completed, the right mold (101) and the left mold (102) are separated. After the mold is separated, the motor (21) is started, which drives the gear (22) to rotate. The rotating gear (22) drives the left seat plate (13), the left cover plate (14), the pin mold (16) and the ejector pin (17) to rotate 90 degrees again through the ring tooth groove (23). At this time, the product that has just been trimmed is moved to one side of the mold cavity (8). When the right mold (101) and the left mold (102) are closed, the trimmed product will be inserted into the groove mold cavity (8) for the second injection molding. After the second injection molding is completed, the mold is separated again. Then the motor (21) drives the product that has been completed in the second injection molding to rotate. When rotating, one end of the ejector rod (17) contacts the guide block (20), so that the guide block (20) pushes the ejector rod (17) to move. The moving ejector rod (17) pushes the product after the second injection molding to complete the product ejection.

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