Secondary injection mold

Abstract

The utility model discloses a secondary injection mold which comprises a front mold assembly and a rear mold assembly, and the rear mold assembly comprises a rear mold plate, a positioning seat, a first forming mechanism, a second forming mechanism and a pin inserting mechanism; the positioning seat is arranged on the rear mold plate, a product to be subjected to secondary injection molding is used for being fixed to the positioning seat, the first forming mechanism and the second forming mechanism are arranged on the two sides of the positioning seat respectively, and the pin mechanism comprises a pin base and a plurality of sets of pins fixed to the pin base; and after the front mold assembly and the rear mold assembly are assembled, the product, the first forming mechanism and the second forming mechanism are enclosed to form a secondary injection molding cavity, and the contact pin is inserted into a thin hole reserved in the product. The drawing needle is inserted into the fine hole of the product to shape the fine hole, so that the secondary injection molding does not influence the quality of the product.

Description

Technical Field

[0001] The utility model relates to the technical field of injection molds, in particular to a secondary injection mold. Background Art

[0002] In small electrical appliances such as electric toothbrushes, some products are equipped with small inner diameter holes. During secondary injection molding, these holes are easily deformed due to the high temperature of secondary injection molding, which increases the difficulty of secondary injection molding. Take the toothbrush head of an electric toothbrush as an example. Figure 1 As shown, Figure 1 The left side of the middle is a toothbrush head 10 of the prior art that has been completed by one injection molding. The surface of the toothbrush head 10 has fine holes 11 for installing bristles later. During the secondary injection molding, Figure 1 As shown on the right side of the figure, the surface of the toothbrush head 10 needs to be coated with rubber to form a rubber skin 12. Due to overheating of the rubber coating, the wall thickness of the toothbrush head 10 is relatively thin due to the presence of the pores 11. If the rubber coating is directly performed on the toothbrush head 10, the pores 11 will be deformed due to heat and the rubber will leak, affecting the product quality. Utility Model Content

[0003] The utility model provides a secondary injection mold, which uses a drawing needle to be inserted into the fine holes of a product to shape the fine holes, thereby ensuring that the secondary injection molding does not affect the quality of the product.

[0004] In order to solve the above problems, the utility model adopts the following technical solutions:

[0005] An embodiment of the utility model provides a secondary injection mold, comprising a front mold assembly and a rear mold assembly, the rear mold assembly comprising a rear mold plate, a positioning seat, a first molding mechanism, a second molding mechanism and a pin mechanism; the positioning seat is arranged on the rear mold plate, and the product to be secondary injection molded is used to be fixed on the positioning seat, the first molding mechanism and the second molding mechanism are respectively arranged on both sides of the positioning seat, and the pin mechanism comprises a pin base and a plurality of groups of pins fixed on the pin base; after the front mold assembly and the rear mold assembly are molded together, the product, the first molding mechanism and the second molding mechanism are enclosed to form a secondary injection cavity, and the pins are inserted into fine holes reserved on the product.

[0006] In some embodiments, the front mold assembly includes a front mold plate, and two first driving mechanisms and a second driving mechanisms are arranged on the front mold plate; the first molding mechanism and the second molding mechanism are both slidably connected to the rear mold plate, and the pin base is slidably connected to the first molding mechanism; in the process of closing the front mold assembly and the rear mold assembly, the two first driving mechanisms are respectively used to drive the first molding mechanism and the second molding mechanism to close toward each other, and after the first molding mechanism and the second molding mechanism are closed, the second driving mechanism is used to drive the pin to be inserted into the fine hole reserved on the product.

[0007] In some embodiments, the first molding mechanism includes a first molding block and a first insert fixed on the first molding block, and the second molding mechanism includes a second molding block and a second insert fixed on the second molding block. After the front mold assembly and the rear mold assembly are molded together, the first insert abuts against the second insert, and the product, the first insert and the second insert are combined to form a secondary injection molding cavity, and the first insert is provided with a through hole for the pin to pass through.

[0008] In some embodiments, the first driving mechanism includes a driving plate, on which an inclined guide rail is provided, and the first forming block and the second forming block are both provided with an inclined guide groove matched with the inclined guide rail, and the inclined guide rail slides in cooperation with the inclined guide groove; the second driving mechanism includes an inclined guide block, and the pin base is provided with a guide groove matched with the inclined guide block, and the inclined guide block slides in cooperation with the guide groove; in the process of closing the front mold assembly and the rear mold assembly, the inclined guide rail first slides in the inclined guide groove, and when the inclined guide rail slides into place along the inclined guide groove, the inclined guide block is inserted into the guide groove.

[0009] In some embodiments, a positioning block is provided on the second insert, and after the front mold assembly and the rear mold assembly are molded together, the positioning block is inserted into a recessed hole reserved on the product.

[0010] In some embodiments, the pin insertion mechanism further includes a support block, and the pin passes through the support block.

[0011] In some embodiments, the product is sleeved on a positioning seat, and an ejector pin is provided on the positioning seat and can slide relative to the positioning seat along the mold opening direction, and the ejector pin is used to eject the product.

[0012] The utility model has at least the following beneficial effects: when the utility model performs secondary injection molding on the product, the pins on the rear mold assembly will be inserted into the fine holes reserved on the product, so as to shape the fine holes. Even if the inner wall of the fine hole melts due to high temperature, the support and shaping effect of the pins prevents the inner wall of the fine hole from deformation and glue leakage, thereby successfully completing the secondary injection molding and ensuring the quality of the product. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 A comparison diagram of a toothbrush head before and after secondary injection molding in the prior art;

[0014] Figure 2 A cross-sectional schematic diagram of a secondary injection mold according to an embodiment of the utility model;

[0015] Figure 3 This is a schematic structural diagram of a front template according to an embodiment of the utility model;

[0016] Figure 4This is a schematic structural diagram of a rear mold assembly according to an embodiment of the utility model;

[0017] Figure 5 This is a schematic structural diagram of a rear mold assembly of an embodiment of the utility model after removing the second molding mechanism;

[0018] Figure 6 This is a structural schematic diagram of a pin insertion mechanism according to an embodiment of the utility model;

[0019] Figure 7 This is a schematic structural diagram of a first embedded block in one embodiment of the utility model;

[0020] Figure 8 This is a schematic structural diagram of a second molding mechanism and a positioning seat in one embodiment of the utility model.

[0021] Wherein, the accompanying drawings are marked as follows:

[0022] Product 10, fine hole 11, rubber 12, concave hole 13;

[0023] Front mold assembly 100, front mold plate 110, receiving groove 111, first driving mechanism 120, driving plate 121, inclined guide rail 122, second driving mechanism 130, inclined guide block 131,

[0024] Rear mold assembly 200, rear template 210, first molding mechanism 220, first molding block 221, first insert block 222, perforation 223, second molding mechanism 230, second molding block 231, second insert block 232, positioning block 233, positioning seat 240, ejector pin 241, pin base 251, pin 252, guide groove 253, support block 254. DETAILED DESCRIPTION

[0025] The utility model provides the following description with reference to the accompanying drawings to help fully understand the various embodiments of the utility model as defined by the claims and their equivalents. The description includes various specific details to help understanding, but these details should be regarded as exemplary only. Therefore, those skilled in the art will recognize that various changes and modifications can be made to the various embodiments described herein without departing from the scope and spirit of the utility model.

[0026] In the description of the present invention, descriptions of orientations, such as up, down, front, back, left, right, etc., and orientations or positional relationships indicated are based on the orientations or positional relationships shown in the drawings and are only for the convenience of describing the present invention and simplifying the description. They do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0027] It will be understood that when one element (eg, a first element) is “connected” to another element (eg, a second element), the element may be directly connected to the other element or an intervening element (eg, a third element) may be present between the element and the other element.

[0028] The embodiment of the utility model provides a secondary injection mold, such as Figure 2-8 As shown, it includes a front mold assembly 100 and a rear mold assembly 200, and the front mold assembly 100 and the rear mold assembly 200 can be molded together or separated from each other. The rear mold assembly 200 includes a rear mold plate 210, a positioning seat 240, a first molding mechanism 220, a second molding mechanism 230 and a pin mechanism. The positioning seat 240 is arranged on the rear mold plate 210, and the product 10 to be secondary injection molded is used to be fixed on the positioning seat 240 to keep the product stable and ensure that the product can be accurately clamped and a corresponding molding cavity can be formed after the mold is closed. The first molding mechanism 220 and the second molding mechanism 230 are respectively arranged on both sides of the positioning seat 240, and the pin mechanism includes a pin base 251 and a plurality of groups of pins 252 fixed on the pin base 251. The number, size and shape of the pins 252 naturally need to be respectively adapted to the number, size and shape of the fine holes on the product 10. After the front mold assembly 100 and the rear mold assembly 200 are molded together, the product 10, the first molding mechanism 220 and the second molding mechanism 230 are combined to form a secondary injection molding cavity for secondary injection molding. A rubber layer can be formed on the surface of the product 10. The pins 252 are inserted into the fine holes reserved on the product 10 to shape the fine holes. Even if the inner walls of the fine holes are melted due to the high temperature of the secondary injection molding, the support and shaping effect of the pins 252 prevents the inner walls of the fine holes from deformation and glue leakage, thereby ensuring the quality of the product while successfully completing the secondary injection molding.

[0029] In some embodiments, the front mold assembly 100 includes a front mold plate 110, on which two first drive mechanisms 120 and a second drive mechanism 130 are disposed. The first molding mechanism 220 and the second molding mechanism 230 are both slidably connected to the rear mold plate 210, and the pin base 251 is slidably connected to the first molding mechanism 220. The first molding mechanism 220 and the second molding mechanism 230 can slide relative to each other, and the sliding direction of the pin base 251 relative to the first molding mechanism 220 can be parallel to the sliding direction of the first molding mechanism 220 relative to the rear mold plate 210. During the process of closing the front mold assembly 100 and the rear mold assembly 200, the two first driving mechanisms 120 are respectively used to drive the first molding mechanism 220 and the second molding mechanism 230 to close toward each other, so that the product 10, the first molding mechanism 220 and the second molding mechanism 230 can be enclosed to form a secondary injection cavity. After the first molding mechanism 220 and the second molding mechanism 230 are closed, the second driving mechanism 130 drives the pin base 251 to move, so that the pin 252 is inserted into the fine hole reserved on the product 10. After the first molding mechanism 220 and the second molding mechanism 230 are closed, the product 10 can be clamped and positioned. After that, the pin 252 moves to the fine hole reserved on the product 10, which can ensure that the pin 252 is accurately aligned with the fine hole reserved on the product 10, and the pin 252 can be smoothly inserted into the fine hole reserved on the product 10.

[0030] After the front mold assembly 100 and the rear mold assembly 200 are opened, the second driving mechanism 130 drives the pin base 251 to move in the opposite direction, thereby pulling the pin 252 out of the fine hole reserved on the product 10, and the two first driving mechanisms 120 are respectively used to drive the first molding mechanism 220 and the second molding mechanism 230 away from each other, thereby exposing the product 10 that has completed the secondary injection molding.

[0031] Furthermore, the first molding mechanism 220 includes a first molding block 221 and a first insert 222 fixed on the first molding block 221, and the second molding mechanism 230 includes a second molding block 231 and a second insert 232 fixed on the second molding block 231. After the front mold assembly 100 and the rear mold assembly 200 are molded, the first insert 222 abuts against the second insert 232, and the product 10, the first insert 222 and the second insert 232 are enclosed to form a secondary injection molding cavity, and more complex structures can be formed by the inserts to ensure the quality of the secondary injection molded product. The first insert 222 is provided with a through hole 223 for the insertion pin 252 to pass through, and the insertion pin 252 can pass through the through hole 223 and then be inserted into the fine hole reserved on the product 10.

[0032] Furthermore, the first driving mechanism 120 includes a driving plate 121, on which an inclined guide rail 122 is provided, and both the first forming block 221 and the second forming block 231 are provided with an inclined guide groove 201 adapted to the inclined guide rail 122, and the inclined guide rail 122 is slidably matched with the inclined guide groove 201. The second driving mechanism 130 includes an inclined guide block 131, and the pin base 141 is provided with a guide groove 253 adapted to the inclined guide block 131, and the inclined guide block is slidably matched with the guide groove. During the process of closing the front mold assembly 100 and the rear mold assembly 200, the inclined guide rail 122 first slides in the inclined guide groove 201 to drive the first molding block 221 and the second molding block 231 to slide respectively, thereby making the first molding block 221 and the second molding block 231 close to each other. When the inclined guide rail 122 slides into place along the inclined guide groove 201, the inclined guide block 131 is inserted into the guide groove 253, thereby driving the pin base 251 to move.

[0033] The front template 110 may be provided with a receiving groove 111 , and the driving plate 121 and the inclined guide block 131 may be fixed in the receiving groove 111 . When the front mold assembly 100 and the rear mold assembly 200 are molded together, the first molding mechanism 220 and the second molding mechanism 230 are both accommodated in the receiving groove 111 .

[0034] In some embodiments, a positioning block 233 is provided on the second insert block 232. After the front mold assembly 100 and the rear mold assembly 200 are molded together, the positioning block 233 is inserted into the recessed hole 13 reserved on the product 10. On the one hand, this can prevent the secondary injection molding rubber from clogging the recessed hole 13. On the other hand, the positioning block 233 will further position the product 10.

[0035] In some embodiments, the pin mechanism also includes a support block 254, and the pin 252 passes through the support block 254. The support block 254 is naturally provided with an opening for the pin 252 to pass through. Since the pin 252 is relatively long, the support block 254 can support the pin 252 to avoid the position of the pin 252 from being skewed, thereby ensuring that the pin 252 can be smoothly inserted into the fine hole reserved on the product 10.

[0036] In some embodiments, the product 10 is sleeved on the positioning seat 240, and the positioning seat 240 can be inserted into the socket at the bottom of the product 10. The positioning seat 240 is provided with an ejector pin 241 that can slide relative to the positioning seat 240 along the mold opening direction. After the secondary injection molding of the product 10 is completed, the ejector pin 241 is ejected outward to push the product 10 away from the positioning seat 240, so that the operator can remove the product 10 that has completed the secondary injection molding.

[0037] The terms and words used in the above description and claims are not limited to the literal meanings, but are only used by the applicant to enable a clear and consistent understanding of the utility model. Therefore, it should be clear to those skilled in the art that the above description of various embodiments of the utility model is provided only for illustration, and not for limiting the utility model as defined by the attached claims and their equivalents.

Claims

1. A secondary injection mold, characterized in that: It includes a front mold assembly and a rear mold assembly, the rear mold assembly includes a rear mold plate, a positioning seat, a first molding mechanism, a second molding mechanism and a pin mechanism; the positioning seat is arranged on the rear mold plate, and the product to be secondary injection molded is used to be fixed on the positioning seat, the first molding mechanism and the second molding mechanism are respectively arranged on both sides of the positioning seat, and the pin mechanism includes a pin base and a plurality of groups of pins fixed on the pin base; after the front mold assembly and the rear mold assembly are molded together, the product, the first molding mechanism and the second molding mechanism are enclosed to form a secondary injection molding cavity, and the pins are inserted into fine holes reserved on the product.

2. The secondary injection mold according to claim 1, characterized in that: The front mold assembly includes a front mold plate, and two first driving mechanisms and a second driving mechanism are arranged on the front mold plate; the first molding mechanism and the second molding mechanism are both slidably connected to the rear mold plate, and the pin base is slidably connected to the first molding mechanism; in the process of closing the front mold assembly and the rear mold assembly, the two first driving mechanisms are respectively used to drive the first molding mechanism and the second molding mechanism to close towards each other, and after the first molding mechanism and the second molding mechanism are closed, the second driving mechanism is used to drive the pin to be inserted into the fine hole reserved on the product.

3. The secondary injection mold according to claim 2, characterized in that: The first molding mechanism includes a first molding block and a first insert fixed on the first molding block, and the second molding mechanism includes a second molding block and a second insert fixed on the second molding block. After the front mold assembly and the rear mold assembly are molded together, the first insert abuts against the second insert, and the product, the first insert and the second insert are combined to form a secondary injection molding cavity. The first insert is provided with a through hole for the pin to pass through.

4. The secondary injection mold according to claim 3, characterized in that: The first driving mechanism includes a driving plate, on which an inclined guide rail is arranged, and the first forming block and the second forming block are both provided with an inclined guide groove matched with the inclined guide rail, and the inclined guide rail and the inclined guide groove are slidably matched; the second driving mechanism includes an inclined guide block, and the pin base is provided with a guide groove matched with the inclined guide block, and the inclined guide block and the guide groove are slidably matched; in the process of closing the front mold assembly and the rear mold assembly, the inclined guide rail first slides in the inclined guide groove, and when the inclined guide rail slides into place along the inclined guide groove, the inclined guide block is inserted into the guide groove.

5. The secondary injection mold according to claim 3, characterized in that: The second insert block is provided with a positioning block, and after the front mold assembly and the rear mold assembly are molded together, the positioning block is inserted into a concave hole reserved on the product.

6. The secondary injection mold according to any one of claims 1 to 5, characterized in that: The pin insertion mechanism also includes a support block, and the pin passes through the support block.

7. The secondary injection mold according to any one of claims 1 to 5, characterized in that: The product is sleeved on the positioning seat, and the positioning seat is provided with an ejector pin which can slide relative to the positioning seat along the mold opening direction, and the ejector pin is used to eject the product.

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