Four-side inner-pulling mold

Abstract

The utility model provides a four-side inner-pulling mould, which relates to the field of moulds, and comprises a mould structure formed by combining an appearance demoulding mechanism, an internal demoulding mechanism and a glue feeding mechanism, the appearance demoulding mechanism is used for demoulding an inverted buckle on the outer side of a product, the internal demoulding mechanism is used for demoulding an inverted buckle in the product, and the glue feeding mechanism is a point glue feeding three-plate mould. According to the invention, the design of the sliding block and the inner-pulling secondary ejection is adopted. The appearance is demolded by an upper mold sliding block mechanism, and when the injection molding machine is opened, the nylon expansion plug, the elastic rubber and the hook leg cooperate to laterally move the upper mold sliding block to be separated from the appearance buckling position. According to the internal-pulling secondary ejection structure for internal demolding, when an injection molding machine ejects out, the ejector pin plate, the buckling machine assembly, the insert check block and the like are linked, so that the internal-pulling insert moves inwards in parallel to be separated from a buckling position, and the demolding problem is efficiently solved.

Description

TECHNICAL FIELD

[0001] The utility model relates to the mould field especially relates to a four -sided inner -pull mould. BACKGROUND

[0002] In the field of injection molding of plastic products, the design and application of the mold play a decisive role in product quality and production efficiency. With the rapid development of industry and the diversification of consumer demand for plastic products, plastic products with complex structures are increasingly widely used in various industries. Among them, the plastic cover with inwardly turned four sides is a representative product, which is usually made of PP material.

[0003] The traditional mold has many problems that are difficult to overcome when facing the molding of such products. On the one hand, when the product inwardly turned amount is greater than 0.45mm and the demolding direction is flat, the product is small and has inwardly turned four sides, and there is a strong demolding position in the middle of the product, the conventional demolding structure is difficult to achieve smooth demolding. For example, the common simple ejection demolding method, when facing large amount of inwardly turned, it is difficult to provide enough demolding space and reasonable demolding path, which easily leads to product deformation, breakage and even damage to the mold during demolding, seriously affecting product quality and production efficiency.

[0004] On the other hand, for such products, not only the demolding should be realized, but also the integrity and functionality of the product should be ensured. When the outwardly turned amount is 0.3mm, the conventional demolding method cannot guarantee the integrity of the buckle position, thereby affecting the assembly and use performance of the product. Moreover, as an appearance part, the appearance quality of the product is also very important, and the traditional demolding method may leave obvious marks on the surface of the product, reducing the market competitiveness of the product.

[0005] The existing mold technology has great limitations in demolding efficiency, product integrity and functionality guarantee when molding products such as plastic covers with inwardly turned four sides. Therefore, an innovative mold design is needed to solve the above technical problems and improve production efficiency and product quality. INVENTION CONTENTS

[0006] The utility model in the prior art, adopt the slide and the inner pull twice top design. The appearance demolding relies on the slide mechanism of the upper mold, the nylon inflation plug, the elastic glue and the hook leg cooperate to make the upper mold slide block side shift and separate from the appearance buckle position. The internal demolding uses the inner pull twice top structure, the ejector plate, the buckle assembly and the insert block are linked to make the inner pull insert parallel to the inside and move out of the buckle position, which efficiently solves the demolding problem.

[0007] In order to solve the above technical problems, the utility model solves the problems of large inwardly turned demolding, product integrity and functionality guarantee through the following technical scheme.

[0008] In order to achieve the above object, the utility model adopts the following technical scheme:

[0009] A four inside pulling mold is used for forming a plastic cover product with PP material four inside reverse buckling, which comprises a mold structure composed of an external shape demolding mechanism, an internal demolding mechanism and a glue feeding mechanism, the external shape demolding mechanism is used for product outside reverse buckling demolding, the internal demolding mechanism is used for product internal reverse buckling demolding, and the glue feeding mechanism is a point glue feeding three-plate mold.

[0010] Preferably, the external shape demolding mechanism adopts an upper mold sliding block mechanism, the upper mold sliding block mechanism comprises a first plate, a second plate, a third plate, a fourth plate, a fifth plate, a hook leg and an upper mold sliding block, nylon inflation plugs are arranged in the fourth plate and the fifth plate, and the hook leg is fixed on the third plate.

[0011] Preferably, elastic glue is arranged on the third plate and the fourth plate, the nylon inflation plugs are used for opening the third plate and the fourth plate, and the hook leg enables the upper mold sliding block to move to both sides, so that the product shape buckle is separated.

[0012] Preferably, a small pull rod is arranged in the mold structure for limiting.

[0013] Preferably, the internal demolding mechanism adopts an inside pulling secondary ejection structure, the inside pulling secondary ejection structure comprises a lower mold punch, a sliding block stopper, a buckle assembly, an inside pulling insert, an insert stopper, a sixth plate, a seventh plate, an eighth plate, a ninth plate, a tenth plate, an eleventh plate, a twelfth plate and a thirteenth plate, and the lower mold punch and the sliding block stopper are both fixed on the seventh plate and the eighth plate fixed plate.

[0014] Preferably, the eleventh plate and the twelfth plate are combined to form a ejector pin plate, the thirteenth plate is provided with an ejection hole, the ejection hole is pushed up by a top rod, and the ejector pin plate is fixed on the fifth plate through a return needle and is synchronously moved up.

[0015] Preferably, the buckle assembly comprises a fourteenth plate, a fifteenth plate, a sixteenth plate, a seventeenth plate and the like, the fourteenth plate is fixed in the seventh plate and the eighth plate, and the fifteenth plate, the sixteenth plate and the seventeenth plate are connected with the sixth plate, the eleventh plate, the twelfth plate and other components in the mold structure.

[0016] Preferably, the inside pulling insert and the insert stopper are matched with each other, the insert stopper has an inclined surface, the inclined surface drives the inside pulling insert to move parallelly inwards to separate from the product buckle.

[0017] Preferably, the fifteenth plate, the sixteenth plate and the seventeenth plate are fixed on the sixth plate through a buckle limiting screw.

[0018] Preferably, a spring is arranged between the eleventh plate and the twelfth plate to reset.

[0019] Compared with the prior art, the utility model has the following beneficial effects:

[0020] The four-side inner extraction mold provided by the application is designed by adopting a sliding block and an inner extraction secondary ejection for complex conditions such as a large inner undercut amount of a product. The shape demolding relies on an upper mold sliding block mechanism. When an injection molding machine is opened, a nylon inflation plug, an elastic glue and a hooked leg cooperate to make the upper mold sliding block laterally move and separate from the shape undercut. The inner demolding uses an inner extraction secondary ejection structure. When the injection molding machine is ejected, a ejector plate, a clamping assembly and an insert block are linked to make the inner extraction insert move inward and separate from the undercut, thereby efficiently solving the demolding problem.

[0021] The application ensures that the product is not damaged in the demolding process through precise mold design and motion control. The shape demolding adopts the upper mold sliding block mechanism, which avoids the extrusion injury of the shape undercut caused by direct demolding and clamping, and guarantees the appearance quality of the appearance part and the integrity and functionality of the undercut. In the inner demolding mechanism, the precise motion control of each component makes the inner extraction insert separate from the undercut at the appropriate time, prevents the product from being deformed or broken during demolding, and effectively guarantees the functionality of the product.

[0022] When the mold is closed, the two sets of ejector plates are reset by springs, the AB plate is closed, the hooked leg is inserted into the upper mold sliding block to complete the closing action, the mold components are accurately reset, a good foundation is provided for the next injection molding, the stability of the product quality is guaranteed, and the rate of defective products is reduced.

[0023] The application can adapt to complex structures such as a small product, inner undercut on four sides, a strong demolding position in the middle and an outer undercut amount of 0.3 mm, solves the problems that the conventional structure cannot realize the inner undercut amount demolding and cannot guarantee the integrity and functionality of the outer undercut, expands the application range of the mold, and meets the diversified production needs of products. BRIEF DESCRIPTION OF DRAWINGS

[0024] In order to more clearly illustrate the technical solutions in the embodiments of the application, the following will briefly introduce the drawings needed in the embodiments. Obviously, the drawings in the following description are only some embodiments of the application, and other drawings can be obtained by those skilled in the art without any creative effort on the basis of these drawings.

[0025] Figure 1 It is a schematic diagram of the overall structure of the utility model;

[0026] Figure 2 It is a schematic diagram of the action of the mold structure parts of the utility model;

[0027] Figure 3 It is a schematic diagram of the action of the opening part structure of the shape demolding mechanism of the utility model;

[0028] Figure 4 is a structure schematic diagram of the lower die part of the utility model product;

[0029] Figure 5 is a structure action schematic diagram of the inner buckle separation part of the utility model product;

[0030] Figure 6 is a separation action schematic diagram of the utility model product;

[0031] Figure 7 is a schematic diagram of the utility model product.

[0032] Figure number explanation: 1, first board;2, second board;3, third board;4, fourth board;5, fifth board;6, sixth board;7, seventh board;8, eighth board;9, ninth board;10, tenth board;11, eleventh board;12, twelfth board;13, thirteenth board;14, fourteenth board;15, fifteenth board;16, sixteenth board;17, seventeenth board;18, hook leg;19, upper die sliding block;20, nylon inflation plug;21, elastic glue;22, small pull rod;23, lower die punch;24, sliding block stopper;25, buckle machine assembly;26, inner extraction insert;27, insert stopper;28, ejector plate;29, ejection hole;30, needle return;31, buckle position limiting screw;32, spring;110, external shape demolding mechanism;210, internal demolding mechanism. DETAILED DESCRIPTION

[0033] The utility model will be further described in detail below in combination with the drawings.

[0034] The following description is used to disclose the utility model so that those skilled in the art can implement the utility model. The preferred embodiments in the following description are only as examples, and other obvious modifications can be thought of by those skilled in the art. The basic principles defined in the following description can be used in other embodiments, modification schemes, improvement schemes, equivalent schemes and other technical schemes without departing from the spirit and scope of the utility model.

[0035] Those skilled in the art should understand that in the disclosure of the utility model, the orientation or position indicated by the terms "longitudinal", "transverse", "upper", "lower", "left", "right", "front", "rear", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like is based on the orientation or position relationship shown in the drawings, which is only for the simplified description of the utility model for the convenience of description, and does not indicate or imply that the indicated device or element must have a particular orientation, be constructed and operated in a particular orientation, therefore the above-mentioned terms can not be understood as a limitation of the utility model.

[0036] It can be understood that the term "one" should be understood as "at least one" or "one or more", that is, in one embodiment, the number of one element can be one, and in another embodiment, the number of the element can be multiple, and the term "one" cannot be understood as a limitation on the number. Embodiments

[0037] Please refer to Figures 1-7 A four-sided inner pulling mold, which comprises a mold structure composed of an external shape demolding mechanism 110, an internal demolding mechanism 210 and a glue feeding mechanism. The external shape demolding mechanism 110 is used for demolding the product outside the reverse buckle, the internal demolding mechanism 210 is used for demolding the product inside the reverse buckle, and the glue feeding mechanism is a point glue feeding three-plate mold.

[0038] The four-sided inner pulling mold of the present application is mainly composed of an external shape demolding mechanism 110, an internal demolding mechanism 210 and a glue feeding mechanism, and the following is the detailed structure and working principle.

[0039] I. Detailed structure and connection mode of each component

[0040] The external shape demolding mechanism 110 adopts an upper mold sliding block mechanism, which includes a No. 1 plate 1, a No. 2 plate 2, a No. 3 plate 3, a No. 4 plate 4, a No. 5 plate 5, a hook leg 18 and an upper mold sliding block 19. The No. 4 plate 4 and the No. 5 plate 5 AB plate are provided with nylon expansion plugs 20, the No. 3 plate 3 and the No. 4 plate 4 are provided with elastic glue 21, and the hook leg 18 is fixed on the No. 3 plate 3.

[0041] The internal demolding mechanism 210 adopts an inner pulling twice-ejecting structure, which includes a lower mold punch 23, a sliding block stopper 24, a buckle mechanism assembly 25, an inner pulling insert 26, an insert stopper 27, a No. 6 plate 6, a No. 7 plate 7, a No. 8 plate 8, a No. 9 plate 9, a No. 10 plate 10, a No. 11 plate 11, a No. 12 plate 12 and a No. 13 plate 13. The lower mold punch 23 and the sliding block stopper 24 are fixed on the No. 7 plate 7 and the No. 8 plate 8; the No. 11 plate 11 and the No. 12 plate 12 combine to form a ejector plate 28, the ejector plate 28 is fixed on the No. 5 plate 5 through a needle return 30; the No. 13 plate 13 is provided with an ejection hole 29; the buckle mechanism assembly 25 includes a No. 14 plate 14, a No. 15 plate 15, a No. 16 plate 16, a No. 17 plate 17 and the like, the No. 14 plate 14 is fixed in the No. 7 plate 7 and the No. 8 plate 8, the No. 15 plate 15, the No. 16 plate 16 and the No. 17 plate 17 connect the No. 6 plate 6, the No. 11 plate 11, the No. 12 plate 12 and other components inside the mold structure; the inner pulling insert 26 cooperates with the insert stopper 27, the insert stopper 27 has an inclined surface; the No. 15 plate 15, the No. 16 plate 16 and the No. 17 plate 17 are fixed on the No. 6 plate 6 through a buckle position limiting screw 31; the No. 11 plate 11 and the No. 12 plate 12 are provided with a spring 32.

[0042] Other components: The mold structure is provided with a small pull rod 22 for limiting.

[0043] Working principle

[0044] (I) Mold opening stage

[0045] First mold opening - profile demolding mechanism 110 starts: the injection molding machine sends a mold opening command to start opening the mold. Because the nylon inflation plug 20 is installed between the No. 4 plate 4 and the No. 5 plate 5 (AB) plate, this nylon inflation plug 20 will provide a preferential separation trend at the moment of mold opening, so that the No. 3 plate 3 and the No. 4 plate 4 provided with the elastic glue 21 are opened first. The hook leg 18 fixed on the No. 3 plate 3 will move synchronously with the movement of the No. 3 plate 3. The movement of the hook leg 18 plays a traction role, pulling the upper mold slider 19 to move open to both sides. This movement of the upper mold slider 19 makes the cooperation between the upper mold slider 19 and the product profile buckle position be released, so as to realize the complete separation of the product profile buckle position. This step is mainly aimed at the demolding of the product outer side undercut. Through the ingenious design of the upper mold slider mechanism, the characteristics of the nylon inflation plug 20 and the elastic glue 21, and the cooperation of the hook leg 18 and the upper mold slider 19, the smooth demolding of the product outer side undercut is realized, avoiding the problem of the product profile buckle position being damaged by the workpiece due to direct mold opening and demolding, and ensuring the product appearance quality and the integrity of the buckle position.

[0046] Second mold opening - upper mold and AB plate opening: the injection molding machine continues the mold opening action, and the mold continues to open according to the pre-set specified action. At this time, the small pull rod 22 plays a role, which serves as a limiting device to ensure that each part of the mold is opened in the correct order and stroke. Under the limiting control of the small pull rod 22, the upper mold part is completely opened first. Then, the No. 4 plate 4 and the No. 5 plate 5 of the AB plate are opened, and the upper mold assembly part and the lower mold assembly part are completely separated PL4. Due to factors such as stress of the product in design and demolding process, the product finally stays in the lower mold part. The mold opening action of this stage further creates conditions for subsequent internal demolding, and at the same time ensures the accuracy and stability of the mold opening action through the limiting of the small pull rod 22.

[0047] Ejection initial stage - ejector plate and related components movement: After the upper and lower mold halves are fully opened, the injection molding machine continues to move until it reaches the maximum mold opening stroke. Then, the injection molding machine starts the ejection operation, the ejector pin passes through the ejection hole 29 and pushes against the ejector plate 28 composed of the eleventh plate 11 and the twelfth plate 12, moving upwards. Because the ejector plate 28 is fixed to the fifth plate 5 through the needle return 30, the fifth plate 5 will move upwards synchronously with the ejector plate 28. In the internal demolding mechanism 210, the buckle machine assembly 25 plays a key role in connection and control. The fourteenth plate 14 in the buckle machine assembly 25 is fixed to the seventh plate 7 and the eighth plate 8, and the fifteenth plate 15, the sixteenth plate 16 and the seventeenth plate 17 are connected to the sixth plate 6, the eleventh plate 11, the twelfth plate 12 and other components inside the mold structure. When the ejector plate 28 moves upwards, it will drive the sixteenth plate 16 to move upwards, which in turn pushes the fifteenth plate 15 to move upwards. Since the fifteenth plate 15 is fixed to the sixth plate 6, this series of linkage makes the sixth plate 6 and the fifth plate 5 move upwards synchronously with the eleventh plate 11, the twelfth plate 12 and the ejector plate. This movement makes the lower mold punch 23 and other related fixed components separate, and during the separation process, the inner extraction insert 26 creates a gap in the inner wall, creating space conditions for the subsequent movement of the inner extraction insert 26.

[0048] Internal extraction demolding stage - inner extraction insert 26 out of buckle position: During the upward movement of the ejector plate 28 and other components, the inclined surface of the insert block 27 will contact the outer side of the inner extraction insert 26. Due to the design of the inclined surface of the insert block 27, when the two contact, the insert block 27 will generate a horizontal pushing force on the inner extraction insert 26, causing the inner extraction insert 26 to move parallelly inward, thereby out of the product buckle position. This process realizes the demolding of the internal reverse buckle of the product. Through the ingenious design of the mechanical structure, the cooperation of the inclined surface of the insert block 27 and the inner extraction insert 26 realizes the precise internal demolding action during the mold movement, solving the problem of internal reverse buckle demolding of the product.

[0049] Product ejection stage - buckle machine unhooking and product ejection: The injection molding machine continues the ejection operation, and at this time the buckle position assembly is unhooked. Under the action of the limiting screw 31, the sixth plate 6 stops moving upwards. The injection molding machine continues to eject, the fifth plate 5 continues to move upwards, and finally the product is ejected. This step completes the entire product demolding process. Through the unhooking of the buckle machine assembly 25 and the limiting of the buckle position limiting screw, as well as the final ejection action of the fifth plate, it is ensured that the product can be smoothly separated from the mold, and the accurate movement and position control of each component during the demolding process are guaranteed.

[0050] (II) Mold closing stage

[0051] Ejector plate 28 reset: when the mold is closed, first two groups of ejector plate (No. 11 plate 11 and No. 12 plate 12) rely on the elastic force of the spring 32 set between No. 11 plate 11 and No. 12 plate 12 to reset first. The elastic force of the spring 32 makes the ejector plate 28 return to the initial position, ready for the next injection molding.

[0052] AB plate closing and hook leg 18 insertion: then No. 4 plate 4 and No. 5 plate 5 of AB plate perform closing action. During the closing process, the hook leg 18 is inserted into the upper mold slider 19, and the closing action is completed. This process restores the closed state of the mold, so that the mold can perform injection molding operation again. Through the closing of the AB plate and the cooperation of the hook leg 18 and the upper mold slider 19, the accuracy and stability of the mold closing are ensured, and the next injection molding can be carried out smoothly.

[0053] In summary, the four-face inner ejector mold effectively solves the demolding problem of PP material four-side inner undercut plastic cover product through the accurate cooperation of each component in the opening and closing process of the mold, while ensuring the integrity and functionality of the product.

[0054] Those skilled in the art should understand that the embodiments of the utility model shown in the above description and the drawings are only as examples and do not limit the utility model. The purpose of the utility model has been completely and effectively realized. The function and structure principle of the utility model have been demonstrated and explained in the embodiments, and the embodiments of the utility model can have any deformation or modification without departing from the principle.

Claims

1. A four-sided inner draw mold for molding a plastic cover product of PP material with an inner reverse buckle around the periphery, characterized in that, The mould structure is composed of an external demoulding mechanism (110), an internal demoulding mechanism (210) and a glue feeding mechanism, the external demoulding mechanism (110) is used for demoulding the product from the outside, the internal demoulding mechanism (210) is used for demoulding the product from the inside, and the glue feeding mechanism is a point glue feeding three-plate mould.

2. A four-sided inward-draft mold according to claim 1, characterized in that: The external demoulding mechanism (110) adopts an upper die sliding block mechanism, which comprises a first plate (1), a second plate (2), a third plate (3), a fourth plate (4), a fifth plate (5), a hook leg (18) and an upper die sliding block (19), the fourth plate (4) and the fifth plate (5) are internally provided with nylon expansion plugs (20), and the hook leg (18) is fixed on the third plate (3).

3. A four-sided inward drawing die according to claim 2, wherein: The third plate (3) and the fourth plate (4) are provided with elastic glue (21), the nylon expansion plug (20) is used for opening the third plate (3) and the fourth plate (4), and the hook leg (18) moves the upper die sliding block (19) to the two sides to realize the separation of the product shape from the buckle position.

4. A four-sided inward drawing die according to claim 1, wherein: The mould structure is internally provided with a small pull rod (22) for limiting.

5. A four-sided inward drawing die according to claim 1, wherein: The internal demoulding mechanism (210) adopts an internal extraction secondary ejection structure, which comprises a lower die punch (23), a sliding block stopper (24), a buckle mechanism assembly (25), an internal extraction insert (26), an insert stopper (27), a sixth plate (6), a seventh plate (7), an eighth plate (8), a ninth plate (9), a tenth plate (10), an eleventh plate (11), a twelfth plate (12) and a thirteenth plate (13), and the lower die punch (23) and the sliding block stopper (24) are both fixed on the fixed plates of the seventh plate (7) and the eighth plate (8).

6. A four-sided inward drawing die according to claim 5, wherein: The eleventh plate (11) and the twelfth plate (12) combine to form a ejector plate (28), the thirteenth plate (13) is internally provided with an ejection hole (29), the ejection hole (29) is lifted up by a top rod, the ejector plate (28) is fixed on the fifth plate (5) by a needle returner (30) and is lifted up synchronously.

7. A four-sided inward drawing die according to claim 5 wherein: The buckle mechanism assembly (25) comprises a fourteenth plate (14), a fifteenth plate (15), a sixteenth plate (16) and a seventeenth plate (17), the fourteenth plate (14) is fixed in the seventh plate (7) and the eighth plate (8), and the fifteenth plate (15), the sixteenth plate (16) and the seventeenth plate (17) are connected with the sixth plate (6), the eleventh plate (11) and the twelfth plate (12).

8. A four-sided inward drawing die according to claim 5 wherein: The internal extraction insert (26) cooperates with the insert stopper (27), the insert stopper (27) has an inclined surface, the inclined surface drives the internal extraction insert (26) to move parallelly inward to separate from the product buckle position.

9. A four-sided inward drawing die according to claim 7, wherein: The fifteenth plate (15), the sixteenth plate (16) and the seventeenth plate (17) are fixed on the sixth plate (6) by a buckle limiting screw (31).

10. A four-sided inward drawing die according to claim 5, wherein: The eleventh plate (11) and the twelfth plate (12) are provided with a spring (32) for resetting.

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