Injection mold structure with secondary ejection function

Abstract

An injection mold structure with a secondary ejection function comprises a forming mold and an ejection mold, the ejection mold comprises an ejector pin plate A, an ejector pin plate B and a bottom plate, cavities are formed in the ejector pin plate A and the ejector pin plate B, fixing seats are installed in the cavities, seesaws capable of rotating in the cavities are hinged to the fixing seats, and the bottom plate is hinged to the forming mold. A top column which extends into the cavity and abuts against the lower surface of the left side of a hinge point of the seesaw is installed on the bottom plate, a top column which abuts against the lower surface of the seesaw is installed on the bottom plate, a limiting ejector pin which abuts against the upper surface of the seesaw movably sleeves the fixed seat, the height of the limiting ejector pin is larger than that of the limiting column, a first ejector pin is fixedly installed on the ejector pin plate A, and a second ejector pin is fixedly installed on the ejector pin plate B; and the end part of the seesaw on the right side of the seesaw hinge point is propped against a second ejector pin. According to the utility model, a secondary ejection structure is realized on the two ejector plates, so that the mold structure is greatly simplified, the overall thickness of the mold is reduced, the design and manufacturing period of the mold is shortened, and the subsequent disassembly, assembly, modification and maintenance of the mold are greatly simplified and helped.

Description

Technical Field

[0001] The utility model relates to the field of molds, in particular to an injection mold structure with a secondary ejection function. Background Art

[0002] In the process of injection mold design, since products often need to meet requirements such as their own assembly and structural strength, some features such as relatively high screw pillars and ribs are designed. In mold design, when the features of product ribs and screw pillars are relatively high, the clamping force on the mold is correspondingly relatively large. The technical requirements of ABS plastic parts are that there are no bubbles on the surface or inside of the plastic parts, no deformation, shrinkage marks, overflow materials, and there are no flash (burrs) and burrs around. For the above requirements of the product, in order to avoid defects such as easy breakage, tearing, or even piercing the product surface in the corresponding area due to the large clamping force during the mold ejection process, which seriously affects the relevant functions of the product and the appearance surface of the product, thus unable to meet the requirements of customers for the product. For such special situations, usually, the secondary ejection structure of the mold is used to complete the smooth demolding of the product. The commonly used mold requires three ejector plates, two sets of mechanical latches, two different stroke limit blocks for the ejection, and all the ejector pins participating in the first ejection need to be additionally provided with fixing blocks, etc. The above design scheme will increase the thickness of the template and also increase the number of many related components in the mold, thereby increasing the production cost of the whole set of molds and the manufacturing cycle of the mold. When the total thickness of the designed mold exceeds the maximum mold thickness requirement of the specified injection molding machine tonnage of the customer, this scheme will not be able to meet the actual production requirements of the customer. Summary of the Utility Model

[0003] The purpose of the utility model is to overcome the deficiencies of the prior art and provide an injection mold structure with a secondary ejection function to solve the technical problems raised in the above background art.

[0004] The purpose of the utility model is realized by the following technical solutions:

[0005] An injection mold structure with a secondary ejection function includes a forming mold and an ejection mold arranged below the forming mold. The ejection mold includes an ejector plate A, an ejector plate B, and a bottom plate arranged in sequence from top to bottom. The ejector plate A and the ejector plate B are fixed together to form an integral body. Cavities are provided on the ejector plate A and the ejector plate B. A fixing seat is installed in the cavity. A seesaw that can rotate in the cavity is hinged on the fixing seat. A ejector post extending into the cavity and abutted against the lower surface of the seesaw is installed on the bottom plate. A limit ejector pin abutted against the upper surface of the seesaw is movably sleeved on the fixing seat. A limit post is fixedly installed on the surface of the ejector plate A. The height of the limit ejector pin is greater than the height of the limit post. A first ejection pin is fixedly installed on the ejector plate A. The end of the seesaw on the right side of the hinge point of the seesaw abuts against a second ejection pin. Both the first ejection pin and the second ejection pin extend upward to the upper surface of the forming mold.

[0006] In the above - mentioned utility model content, further, the cross - section of the limiting ejector pin is in a T - shaped structure. A limiting part is arranged on the fixed seat. The limiting ejector pin is inversely sleeved on the limiting part and the waist of the limiting ejector pin abuts against the lower surface of the limiting part.

[0007] In the above - mentioned utility model content, further, a limiting plate is fixedly installed on the limiting part, and a limiting inclined surface cooperating with the limiting plate is arranged on the seesaw.

[0008] In the above - mentioned utility model content, further, a first rotation relief groove cooperating with the limiting ejector pin is arranged on the upper surface of the seesaw.

[0009] In the above - mentioned utility model content, further, a second rotation relief groove is arranged at the end of the seesaw where it abuts against the second ejector pin.

[0010] The beneficial effects of the present utility model are as follows:

[0011] The present utility model realizes a secondary ejection structure on two ejector plates, greatly simplifies the mold structure, reduces the overall thickness of the mold, shortens the design and manufacturing cycle of the mold, and greatly simplifies and helps the subsequent disassembly, modification and maintenance of the mold. Therefore, the innovation of this mold slide structure will produce significant economic benefits in aspects such as mold design innovation and mold cost control. Brief Description of the Drawings

[0012] Figure 1 is a schematic structural diagram of the present utility model;

[0013] Figure 2 is Figure 1 the front view of

[0014] Figure 3 is a state diagram of the first - stage ejection of the present utility model;

[0015] Figure 4 is Figure 3 the front view of

[0016] Figure 5 is a state diagram of the second - stage ejection of the present utility model;

[0017] Figure 6 is Figure 5 the front view of

[0018] In the figure, 1 - the first ejector pin 1, 2 - the second ejector pin 2, 3 - the ejector post, 4 - the limiting part, 5 - the seesaw, 6 - the limiting ejector pin, 7 - the limiting plate, 8 - the seesaw hinge point, 9 - the ejector plate A, 10 - the ejector plate B, 11 - the bottom plate, 12 - the fixing seat, 13 - the limiting post, 14 - the first rotation relief groove, 15 - the forming die, 16 - the second rotation relief groove, 17 - the limiting inclined surface. Detailed implementation manners

[0019] The following uses specific specific examples to illustrate the implementation manners of the present utility model. Those skilled in the art can easily understand other advantages and effects of the present utility model from the content disclosed in this specification. The present utility model can also be implemented or applied through other different specific implementation manners. Various details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of the present utility model. It should be noted that, without conflict, the following embodiments and the features in the embodiments can be combined with each other.

[0020] It should be noted that the drawings provided in the following embodiments only illustrate the basic concept of the present utility model in a schematic manner. Therefore, only the components related to the present utility model are shown in the drawings, rather than being drawn according to the number, shape, and size of the components in actual implementation. The type, quantity, and ratio of each component in actual implementation can be arbitrarily changed, and the component layout type may also be more complex.

[0021] Embodiment:

[0022] An injection mold structure with a secondary ejection function, refer to the attached Figure 1 and the attached Figure 2As shown in the figure, it includes a forming die 15 and an ejection die arranged below the forming die 15. The ejection die includes an ejector plate A9, an ejector plate B10, and a bottom plate 11 arranged in sequence from top to bottom. The ejector plate A9 and the ejector plate B10 are fixed together to form an integral body. Cavities are provided on the ejector plate A and the ejector plate B. A fixing seat 12 is installed in the cavities. Specifically, the fixing seat 12 is directly inlaid in the cavities of the top plate A and the top plate B. A seesaw 5 that can rotate in the cavity is hinged on the fixing seat 12. A top column 3 extending into the cavity and abutting against the lower surface of the seesaw 5 is installed on the bottom plate 11. A limiting ejector pin 6 abutting against the upper surface of the seesaw 5 is movably sleeved on the fixing seat 12. The seesaw 5 is in a horizontal state under the action of the limiting ejector pin 6 and the top column 3. A limiting portion 4 is provided on the fixing seat 12. The limiting ejector pin 6 is directly sleeved on the limiting portion 4 of the fixing seat 12. Considering that the limiting ejector pin 6 is movably sleeved, in order to prevent the limiting ejector pin 6 from falling off the limiting portion, the cross-section of the limiting ejector pin 6 is set as a T-shaped structure. The limiting ejector pin 6 is inversely sleeved on the limiting portion 4, and the waist of the T-shaped structure of the limiting ejector pin abuts against the lower surface of the limiting portion 4. The waist of the T-shaped structure of the limiting ejector pin is used to limit the limiting ejector pin 6. A limiting column 13 is fixedly installed on the surface of the ejector plate A9. The height of the limiting ejector pin 6 is greater than the height of the limiting column 13. The distance from the top of the limiting ejector pin 6 to the lower surface of the forming die 15 is the stroke of the first ejection of the die. The distance from the top of the limiting column 13 to the lower surface of the forming die 15 is the stroke of the second ejection of the die. A first ejection pin 1 is fixedly installed on the ejector plate A9. The end of the seesaw 5 on the right side of the hinge point 8 of the seesaw abuts against a second ejection pin 2. Both the first ejection pin 1 and the second ejection pin 2 extend upward to the upper surface of the forming die 15.

[0023] In the specific working process of the present utility model, refer to the attached Figure 3 and the attached Figure 4 As shown in the figure, under the action of the injection molding machine top rod of the die, the ejector plate A9 and the ejector plate B10 move upward. The first ejection pin 1 and the second ejection pin 2 move upward together and eject the injection molded part on the forming die 15 upward. When the top of the limiting ejector pin 6 contacts the bottom of the forming die 15, the first ejection of the injection molded part is completed. As the ejector plate A9 and the ejector plate B10 continue to move upward, refer to the attached Figure 5 and the attached Figure 6As shown, the limit ejector pin 6 slides downward under the action of the forming die and begins to squeeze the seesaw 5 downward. During the squeezing process, the seesaw 5 starts to rotate counterclockwise with the seesaw hinge point 8 as the fulcrum. During the rotation of the seesaw 5, the second ejector pin 2 is driven to perform a secondary upward ejection. When the top of the limit column 13 contacts the lower surface of the forming die, the seesaw 5 stops rotating, and the secondary ejection of the second ejector pin 2 is completed. It should be noted that during the secondary ejection process, after the limit ejector pin 6 contacts the bottom surface of the forming die 15, the first ejector pin 1 will continue to move upward until the top surface of the limit column 13 contacts the bottom surface of the forming die 15. As shown in the appendix Figure 4 In the structural schematic diagram shown, after the limit ejector pin 6 contacts the bottom surface of the forming die 15, the first ejector pin 1 will continue to eject upward by 16 cm until the top surface of the limit column 13 contacts the bottom surface of the forming die 15. And the second ejector pin 2 is ejected upward by 30.35 cm under the action of the seesaw 5 (as shown in the appendix Figure 6 shown). The second ejector pin 2 will eject upward 14.35 cm more than the first ejector pin 1. Thus, the secondary ejection and demolding of the injection molded part are completed.

[0024] It should be further explained for the above embodiments that considering that there may be structural dead points between the seesaw 5 and the limit ejector pin 6 and the second ejector pin 2 during the rotation process of the seesaw 5, and thus the situation where the seesaw 5 cannot rotate may occur. Continuing to refer to the appendix Figure 1 shown, a first rotation relief groove 14 cooperating with the limit ejector pin 6 is provided on the upper surface of the seesaw 5, and a second rotation relief groove 16 is provided at the end of the seesaw 5 where it abuts against the second ejector pin 2. Thus, it is prevented that there are motion structural dead points between the seesaw 5 and the limit ejector pin 6 and the second ejector pin 2 during the rotation process of the seesaw 5. Secondly, a limit plate 7 is fixedly installed on the limiting part 4, and a limit inclined surface 17 cooperating with the limit plate is provided on the seesaw. After the secondary ejection of the injection molded part is completed, the limit inclined surface 17 abuts against the lower surface of the limit plate 7, and thus the rotational limit of the seesaw 5 can be completed.

[0025] The above embodiments only represent the specific implementation manners of the present invention, and the description is relatively specific and detailed, but it cannot be thus understood as a limitation on the scope of the patent of the present invention. It should be pointed out that for those of ordinary skill in the art, without departing from the concept of the present invention, several deformations and improvements can still be made, and these all belong to the protection scope of the present invention.

Claims

1. An injection mold structure with a secondary ejection function, comprising a molding mold and an ejection mold arranged below the molding mold, characterized in that: The ejection mold includes an ejector plate A, an ejector plate B and a bottom plate which are arranged in sequence from top to bottom. The ejector plate A and the ejector plate B are fixed together to form a whole. A cavity is provided on the ejector plate A and the ejector plate B. A fixed seat is installed in the cavity. A seesaw that can rotate in the cavity is hinged on the fixed seat. An ejector column extending into the cavity and abutting against the lower surface of the seesaw is installed on the bottom plate. A limiting ejector pin abutting against the upper surface of the seesaw is movably mounted on the fixed seat. A limiting column is fixedly installed on the surface of the ejector plate A. The height of the limiting ejector pin is greater than the height of the limiting column. A first ejector pin is fixedly installed on the ejector plate A. The end of the seesaw on the right side of the hinge point of the seesaw abuts against the second ejector pin. The first ejector pin and the second ejector pin both extend upward to the upper surface of the molding mold.

2. The injection mold structure with secondary ejection function according to claim 1, characterized in that: The cross section of the limiting ejector pin is T-shaped. The fixing seat is provided with a limiting portion. The limiting ejector pin is invertedly sleeved on the limiting portion and the waist of the limiting ejector pin abuts against the lower surface of the limiting portion.

3. The injection mold structure with secondary ejection function according to claim 2, characterized in that: A limiting plate is fixedly mounted on the limiting portion, and a limiting inclined surface cooperating with the limiting plate is arranged on the seesaw.

4. The injection mold structure with secondary ejection function according to claim 1, characterized in that: The upper surface of the seesaw is provided with a first rotational clearance groove matched with the limiting ejector pin.

5. The injection mold structure with secondary ejection function according to claim 1, characterized in that: A second rotational clearance groove is arranged on the end of the seesaw which abuts against the second ejection needle.

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