Thin-wall long core-pulling injection mold

Abstract

The utility model provides a thin-wall long core-pulling injection mold. The thin-wall long core-pulling injection mold comprises a front mold, a front mold core, a rear mold, a rear mold core and a long core-pulling mechanism, the long core pulling mechanism comprises a driver, a core pulling sliding block assembly, a mold locking assembly, a forming sliding block and a forming shaft column. The core-pulling sliding block assembly and the forming sliding block are both assembled on the rear mold in a lateral sliding mode, the core-pulling sliding block assembly and the forming sliding block are connected through a delay linkage piece, the first end of the forming shaft column is fixed to the core-pulling sliding block assembly, and the second end of the forming shaft column penetrates through the forming sliding block and is inserted into the rear mold core. The mold locking assembly is blocked on the outer side of the forming sliding block so as to limit the forming sliding block to be pulled outwards. The core-pulling sliding block assembly is provided with a pressing block corresponding to the stopping block so as to drive the mold locking assembly to give way in the core-pulling movement of the core-pulling sliding block assembly; the driver is in driving connection with the core-pulling sliding block assembly so as to drive the core-pulling sliding block assembly to slide. And stable core pulling of the thin-wall long-strip-shaped product is achieved.

Description

Technical Field

[0001] The utility model relates to the field of injection molds, in particular to a thin-wall long core-pulling injection mold. Background Art

[0002] An injection mold is a tool for producing plastic products; it is also a tool that gives plastic products a complete structure and precise dimensions. Injection molding is a processing method used in mass production of certain parts with complex shapes. Specifically, it refers to the process of injecting heated and molten plastic into the mold cavity under high pressure by an injection molding machine, and obtaining a molded product after cooling and solidification.

[0003] When some long hollow products are obtained by injection molding, it is necessary to insert a molding column into the molding cavity. After the injection molding is completed, the molding column is first pulled out and then demolded. Because the product is hollow, long and thin-walled, the molding column has a large contact area with the product. In order to prevent damage to the product during core pulling, a more stable core pulling structure needs to be designed. Utility Model Content

[0004] Therefore, the utility model provides a thin-wall long core-pulling injection mold to solve the above problems.

[0005] To achieve the above purpose, the technical solution provided by the utility model is as follows:

[0006] A thin-walled long core-pulling injection mold comprises a front mold, a front mold core arranged on the front mold, a rear mold, a rear mold core arranged on the rear mold, and a long core-pulling mechanism; the long core-pulling mechanism comprises a driver, a core-pulling slider assembly, a locking mold assembly, a molding slider, and a molding shaft column; the core-pulling slider assembly and the molding slider can be assembled on the rear mold in a laterally slidable manner, the core-pulling slider assembly and the molding slider are connected by a delayed linkage, the first end of the molding shaft column is fixed to the core-pulling slider assembly, and the second end of the molding shaft column passes through the molding slider and is inserted into the rear mold core; the locking mold assembly blocks the outer side of the molding slider to limit the molding slider from being pulled outward; the core-pulling slider assembly has a pressure block corresponding to the locking mold assembly to drive the locking mold assembly to give way during the core-pulling movement of the core-pulling slider assembly; the driver drives and connects the core-pulling slider assembly to drive the core-pulling slider assembly to slide.

[0007] Furthermore, the mold locking assembly includes a blocking block and an elastic member, and the blocking block is lifted up to block the forming slider under the action of the elastic member; the pressing block of the core-pulling slider assembly corresponds to the blocking block.

[0008] Furthermore, the blocking block has a first inclined mating surface, and the pressing block has a second inclined mating surface. The core pulling movement of the core pulling slider assembly drives the blocking block to descend and make way through the oblique guide cooperation between the second inclined mating surface of the pressing block and the first inclined mating surface of the blocking block.

[0009] Furthermore, there are two elastic members, which act on two sides of the blocking block respectively, and the middle position of the blocking block is used to cooperate with the pressing block.

[0010] Furthermore, the delayed linkage part is a connecting screw, the first end of which passes through the molding slider and is fixed on the core-pulling slider assembly, and the second end of the connecting screw is a nut; an abutment step corresponding to the nut is provided on the molding slider; when the core-pulling slider assembly abuts against the molding slider, the abutment step and the nut are spaced apart; when the core-pulling slider assembly is separated from the molding slider by a certain distance, the nut abuts against the abutment step, thereby forming a linkage between the molding slider and the core-pulling slider assembly.

[0011] Furthermore, the molded shaft column is a hollow cylinder, and a cooling pipe is installed in the molded shaft column.

[0012] Furthermore, the core-pulling slider assembly specifically includes a first slider, a second slider and the pressure block, the first slider and the second slider are spliced ​​and fixed, and the pressure block is fixedly connected to the first slider and the second slider; the first end of the forming shaft column is formed with a radially outwardly extending limiting boss, and the limiting boss is limited between the first slider and the second slider, and the cooling pipe is fixed in the first slider and passed through the forming shaft column.

[0013] Furthermore, the driver is an electric push rod or a cylinder.

[0014] Furthermore, the rear mold is also provided with an ejection mechanism, which includes an ejector plate and a product ejector and a gate ejector connected to the ejector plate. The product ejector is used for corresponding products, and the gate ejector is used for corresponding sprue materials; the product ejector forms a delayed linkage with the ejector plate so that the product ejector is ejected later than the gate ejector.

[0015] Furthermore, the delayed linkage cooperation structure between the product ejector and the ejector plate is as follows: the ejector plate forms a limiting cavity, the end of the product ejector is limited in the limiting cavity of the ejector plate, and can be lifted and lowered within the range of the limiting cavity.

[0016] The technical solution provided by the utility model has the following beneficial effects:

[0017] Through the injection mold provided by the present application, when core pulling is performed, the core pulling slider assembly is driven by the driver to move outward to pull the core. In the initial stage, the molding slider is blocked by the mold locking assembly and remains motionless, thereby supporting the product; the core pulling slider assembly drives the molding shaft column to be pulled out a certain distance in advance, so that the molding shaft column and the product are separated in advance, and the molding shaft column and the product are stably separated, effectively avoiding damage to the product. Afterwards, the continued outward movement of the core pulling slider assembly drives the mold locking assembly to give way through the pressure block, and the core pulling slider assembly drives the molding slider to move outward together through the delayed linkage, thereby achieving complete lateral separation. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 The figure is a schematic structural diagram of a thin-walled long core-pulling injection mold in an embodiment;

[0019] Figure 2 The figure shows a partial structural schematic diagram of a thin-walled long core-pulling injection mold in an embodiment;

[0020] Figure 3 Shown Figure 2 Sectional view along line AA;

[0021] Figure 4 Shown Figure 3 Enlarged schematic diagram of the middle C area;

[0022] Figure 5 Shown Figure 2 Sectional view along the midline BB;

[0023] Figure 6 Shown Figure 5 A magnified schematic diagram of the middle D area;

[0024] Figure 7 Shown Figure 5 A magnified schematic diagram of the middle E region;

[0025] Figure 8 The figure shows a partial structural schematic diagram of the long core pulling mechanism in the embodiment;

[0026] Fig. 9 The figure shows a schematic diagram of the structural decomposition of the pressing block and the clamping assembly in the embodiment. DETAILED DESCRIPTION

[0027] To further illustrate the various embodiments, the present invention provides drawings. These drawings are part of the disclosure of the present invention, which are mainly used to illustrate the embodiments and can be used in conjunction with the relevant descriptions in the specification to explain the operating principles of the embodiments. With reference to these contents, a person of ordinary skill in the art should be able to understand other possible implementations and advantages of the present invention. The components in the figures are not drawn to scale, and similar component symbols are generally used to represent similar components.

[0028] In the description of the present invention, terms such as "up", "down", "left", "right", "front", "back", etc., and the orientation or position relationship are based on the orientation or position relationship shown in the drawings, and are only for the convenience of description and simplification of operation, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation of the present invention.

[0029] The utility model is now further described in conjunction with the accompanying drawings and specific implementation methods.

[0030] Reference Figures 1 to 9 As shown, a thin-walled long core-pulling injection mold provided in this embodiment includes a front mold 11, a front mold core (not shown) arranged on the front mold 11, a rear mold 12, a rear mold core 13 arranged on the rear mold 12, and a long core-pulling mechanism; wherein the long core-pulling mechanism includes a driver 60, a core-pulling slider assembly 20, a mold locking assembly 40, a molding slider 30, and a molding shaft column 70; the core-pulling slider assembly 20 and the molding slider 30 can both be assembled on the rear mold 12 in a sideways sliding manner, and the molding slider 30 cooperates with the rear mold core 13 to form a product. The core-pulling slider assembly 20 and the molding slider 30 are connected by a delayed linkage 50, so that the core-pulling slider assembly 20 and the molding slider 30 form a delayed linkage, that is, the core-pulling slider assembly 20 forms a linkage with the molding slider 30 through the delayed linkage 50 only after it moves outward for a certain distance.

[0031] The first end of the molding shaft column 70 is fixed to the core-pulling slider assembly 20 , and the second end of the molding shaft column 70 passes through the molding slider 30 and is inserted into the rear mold core 13 for molding products.

[0032] The mold locking assembly 40 blocks the outer side of the molding slider 30 to limit the molding slider 30 from being pulled outward; the core pulling slider assembly 20 has a pressure block 23 corresponding to the mold locking assembly 40 to drive the mold locking assembly 40 to give way during the core pulling movement of the core pulling slider assembly 20; the driver 60 drives and connects the core pulling slider assembly 20 to drive the core pulling slider assembly 20 to slide.

[0033] When the above-mentioned thin-walled long core-pulling injection mold is used for injection molding to obtain a product and demolding, the first step is for the front mold 11 and the rear mold 12 to complete the mold opening action, and the second step is to first pull out the molding shaft column 70 and the molding slider 30; specifically: the driver 60 drives the core-pulling slider assembly 20 to move outward to pull the core. In the initial stage, there is no linkage between the core-pulling slider assembly 20 and the molding slider 30, and the molding slider 30 is blocked by the clamping assembly 40 and remains motionless, thereby supporting the product; the core-pulling slider assembly 20 drives the molding shaft column 70 to be pulled out a distance in advance, so that the molding shaft column 70 is separated from the product in advance, and the molding shaft column 70 is stably separated from the product, effectively avoiding damage to the product. Afterwards, the continued outward movement of the core-pulling slider assembly 20 drives the clamping assembly 40 to give way through the pressure block 23, and the core-pulling slider assembly 20 drives the molding slider 30 to move outward together through the delayed linkage 50 to achieve complete lateral separation. The third step is to eject the product; demolding is completed.

[0034] In this embodiment, the mold locking assembly 40 includes a blocking block 41 and an elastic member 42. The blocking block 41 is lifted up to block the molding slide block 30 under the action of the elastic member 42; Figure 8 As shown, the elastic member 42 is disposed at the bottom of the blocking block 41 and exerts an upward elastic force on the blocking block 41, so that the blocking block 41 is lifted to the outside of the forming slider 30, thereby blocking the forming slider 30. The pressing block 23 of the core-pulling slider assembly 20 corresponds to the blocking block 41, so as to drive the blocking block 41 to descend and give way during the core-pulling movement of the core-pulling slider assembly 20.

[0035] Specifically, the blocking block 41 has a first inclined mating surface 411, and the pressing block 23 has a second inclined mating surface 231. The core pulling movement of the core pulling slider assembly 20 drives the blocking block 41 to descend and make way through the oblique guide cooperation between the second inclined mating surface 231 of the pressing block 23 and the first inclined mating surface 411 of the blocking block 41. With such a configuration, the driving of the blocking block 41 by the pressing block 23 is smoother and less prone to jamming.

[0036] The elastic member 42 is specifically a spring, and there are two of them, acting on both sides of the blocking block 41 respectively. The middle position of the blocking block 41 is used to cooperate with the pressing block 23. With this arrangement, the force is balanced and not easy to deviate.

[0037] The above-mentioned mold locking assembly 40 is a more preferred structure. Of course, in other embodiments, the structure of the mold locking assembly 40 can also be implemented by other structures.

[0038] In this embodiment, the delay linkage member 50 is a connecting screw 51, the first end of which passes through the forming slider 30 and is fixed on the core-pulling slider assembly 20, and the second end of the connecting screw 51 is a nut 52; the forming slider 30 is provided with an abutting step 31 corresponding to the nut 52; when the core-pulling slider assembly 20 abuts against the forming slider 30, as shown in FIG. Figure 4 As shown, the abutting step 31 and the nut 52 are arranged at a distance. When the core-pulling slider assembly 20 is separated from the forming slider 30 by a distance, the nut 52 abuts against the abutting step 31, thereby forming a linkage between the forming slider 30 and the core-pulling slider assembly 20. The connecting screw 51 is used to realize the delayed linkage between the core-pulling slider assembly 20 and the forming slider 30, and the structural design is simple and easy to implement. Of course, in other embodiments, other components with delayed linkage effect can also be used instead.

[0039] The molding shaft column 70 is a hollow cylinder, and a cooling pipe 71 is installed in the molding shaft column 70. The addition of the cooling pipe 71 can speed up the cooling and molding of the injection molded product.

[0040] Specifically, the core-pulling slider assembly 20 specifically includes a first slider 21, a second slider 22 and the pressing block 23, the first slider 21 and the second slider 22 are spliced ​​and fixed, and the pressing block 23 is fixedly connected to the first slider 21 and the second slider 22; the first end of the forming shaft column 70 is formed with a limiting boss 72 extending radially outward, and the limiting boss 72 is limited between the first slider 21 and the second slider 22, and the cooling pipe 71 is fixed in the first slider 21 and penetrates the forming shaft column 70. In this way, the assembly of the cooling pipe 71 and the forming shaft column 70 is achieved.

[0041] The driver 60 is a cylinder, which is commonly used in the field of injection molding. Of course, in other embodiments, a driver capable of linear pushing and pulling, such as an electric push rod, may also be used.

[0042] Specifically, in this embodiment, the rear mold 12 is further provided with an ejection mechanism, which includes an ejector plate 14 and a product ejector 15 and a gate ejector (not shown) connected to the ejector plate 14. The product ejector 15 is used to correspond to the product, and the gate ejector is used to correspond to the sprue material. The product ejector 15 forms a delayed linkage with the ejector plate 14, so that the product ejector 15 is ejected later than the gate ejector. That is, when the ejection starts, the gate ejector first ejects the sprue material, so that the sprue material is separated from the product first, and then the product ejector 15 ejects the product; in this way, the sprue material and the product can be separated in advance.

[0043] Specifically, the structure of the delayed linkage cooperation between the ejector pin 15 and the ejector plate 14 is as follows: Figure 7As shown, the ejector plate 14 forms a limited cavity 141, and the end of the product ejector 15 is limited in the limited cavity 141 of the ejector plate 14, and can move up and down within the range of the limited cavity 141, that is, the height dimension of the limited cavity 141 is greater than the thickness dimension of the end of the product ejector 15. When the ejector plate 14 starts to rise, the gate ejector and the ejector plate 14 act synchronously, while the product ejector 15 remains stationary. When the ejector plate 14 is lifted to the bottom wall of the limited cavity 141 and abuts against the product ejector 15, the product ejector 15 is synchronously driven to move up and eject, thereby realizing the delayed ejection of the product ejector 15. Of course, in other embodiments, the delayed ejection structure of the product ejector 15 is not limited to this.

[0044] Although the present invention has been specifically demonstrated and described in conjunction with the preferred embodiments, those skilled in the art should understand that various changes may be made to the present invention in form and detail without departing from the spirit and scope of the present invention as defined in the appended claims, all of which are within the scope of protection of the present invention.

Claims

1. A thin-walled long core-pulling injection mold, comprising a front mold, a front mold core arranged on the front mold, a rear mold, a rear mold core arranged on the rear mold, and a long core-pulling mechanism; characterized in that: The long core-pulling mechanism includes a driver, a core-pulling slider assembly, a mold locking assembly, a molding slider and a molding shaft column; the core-pulling slider assembly and the molding slider can be assembled on the rear mold in a sideways sliding manner, the core-pulling slider assembly and the molding slider are connected by a delayed linkage, the first end of the molding shaft column is fixed to the core-pulling slider assembly, and the second end of the molding shaft column passes through the molding slider and is inserted into the rear mold core; the mold locking assembly blocks the outside of the molding slider to limit the outward withdrawal of the molding slider; the core-pulling slider assembly has a pressure block corresponding to the mold locking assembly to drive the mold locking assembly to give way during the core-pulling movement of the core-pulling slider assembly; the driver drives the connection to the core-pulling slider assembly to drive the core-pulling slider assembly to slide.

2. The thin-walled long core-pulling injection mold according to claim 1, characterized in that: The mold locking assembly includes a blocking block and an elastic member. The blocking block is lifted up to block the forming slider under the action of the elastic member; the pressing block of the core-pulling slider assembly corresponds to the blocking block.

3. The thin-walled long core-pulling injection mold according to claim 2, characterized in that: The blocking block has a first inclined matching surface, and the pressing block has a second inclined matching surface. The core pulling movement of the core pulling slider assembly drives the blocking block to descend and give way through the oblique guide matching between the second inclined matching surface of the pressing block and the first inclined matching surface of the blocking block.

4. The thin-walled long core-pulling injection mold according to claim 2 or 3, characterized in that: There are two elastic members, which act on two sides of the blocking block respectively, and the middle position of the blocking block is used to cooperate with the pressing block.

5. The thin-walled long core-pulling injection mold according to claim 1, characterized in that: The delayed linkage part is a connecting screw, the first end of which passes through the forming slider and is fixed on the core-pulling slider assembly, and the second end of the connecting screw is a nut; an abutment step corresponding to the nut is provided on the forming slider; when the core-pulling slider assembly abuts against the forming slider, the abutment step and the nut are arranged at a distance; when the core-pulling slider assembly is separated from the forming slider by a certain distance, the nut abuts against the abutment step, thereby forming a linkage between the forming slider and the core-pulling slider assembly.

6. The thin-walled long core-pulling injection mold according to claim 1, characterized in that: The molded shaft column is a hollow cylinder, and a cooling pipe is installed in the molded shaft column.

7. The thin-walled long core-pulling injection mold according to claim 6, characterized in that: The core-pulling slider assembly specifically includes a first slider, a second slider and the pressure block, the first slider and the second slider are spliced ​​and fixed, and the pressure block is fixedly connected to the first slider and the second slider; a radially outwardly extending limiting boss is formed at the first end of the forming shaft column, and the limiting boss is limited between the first slider and the second slider, and the cooling pipe is fixed in the first slider and penetrates into the forming shaft column.

8. The thin-walled long core-pulling injection mold according to claim 1, characterized in that: The driver is an electric push rod or an oil cylinder.

9. The thin-walled long core-pulling injection mold according to claim 1, characterized in that: The rear mold is also provided with an ejection mechanism, which includes an ejector plate and a product ejector and a gate ejector connected to the ejector plate. The product ejector is used for corresponding products, and the gate ejector is used for corresponding sprue materials; the product ejector forms a delayed linkage with the ejector plate so that the product ejector is ejected later than the gate ejector.

10. The thin-walled long core-pulling injection mold according to claim 9, characterized in that: The delayed linkage cooperation structure between the product ejector and the ejector plate is as follows: the ejector plate forms a limited cavity, the end of the product ejector is limited in the limited cavity of the ejector plate, and can be lifted and lowered within the range of the limited cavity.

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