A quick release structure for injection mold

Abstract

The utility model discloses a kind of quick release structure for injection mold, the quick release structure is installed on mould frame, including ejection reset transmission structure, the ejection reset transmission structure is installed in the inside of mould frame, further include inner mould structure, the inner mould structure includes inner mould, ejection mechanism and intermediate structure, inner mould is fixed on the lower die plate of mould frame, ejection mechanism is installed in the inside of the inner mould, and detachably connect the intermediate structure, intermediate structure movably installs in the cavity between lower die plate and inner mould and detachably connect transmission connecting rod, transmission connecting rod is through lower die plate and is fixed on ejection reset transmission structure.This device structure design is simple, without together with ejection reset transmission structure to disassemble, lower die plate does not need to open frame, and it is simple to replace, high efficiency.

Description

Technical Field

[0001] This utility model relates to the technical field of partial improvement design of injection molds, and in particular to a quick-release structure for injection molds. Background Technology

[0002] In the process of producing plastic molds on injection molding machines, in order to save costs, multiple products with similar part numbers will be produced using the same mold. This facilitates the switching and maintenance of different part numbers using the same mold. However, the existing mold structure cannot meet the needs well, often requiring more time and manpower, increasing costs. Furthermore, the excessive weight of mold components during switching can easily cause safety hazards. In addition, the conventional quick-break structure provides poor support for the forming position inside the mold, which can easily lead to poor quality during injection molding.

[0003] In the prior art, patent CN215550422U discloses an easily replaceable injection mold, comprising: a lower mold assembly, including a lower mold plate, a lower mold core body, and a quick-release block; two recesses are formed in the middle of the lower mold core body, and slots are formed on one side of the lower mold core body corresponding to each recess; one end of the quick-release block passes through the slot and extends into the recess, and the quick-release block cooperates with the lower mold core body to form the lower mold core; and an upper mold assembly, including an upper mold plate and an upper mold core; the upper mold core is used to abut against the lower mold core body and the quick-release block; two upper recesses are formed in the middle of the upper mold core; the gap between the upper recesses, the lower recesses, and one end of the quick-release block forms an injection cavity, and the internal contour of the injection cavity can be changed by replacing different quick-release blocks. The aforementioned easily replaceable injection mold has a simple structure and is convenient to use. By replacing the quick-release blocks, the internal contour of the injection cavity can be quickly changed by replacing the lower mold core, simplifying the replacement process, effectively improving production efficiency, and reducing production costs.

[0004] Patent CN222387482U discloses a quick-release mechanism for plastic injection molds, including a lower mold base and an upper mold base. A fixed mold is installed on the lower mold base for supporting and positioning the plastic product; an injection molding mechanism is installed on the upper mold base for pressing and molding the plastic product; multiple quick-release structures are provided between the lower mold base and the upper mold base for quick assembly and disassembly; the quick-release structure includes a first fixed plate fixed on the upper mold base and a second fixed plate fixed on the lower mold base. A limit slot is provided on the first fixed plate, and a locking block is fixedly connected to the second fixed plate. The locking block slides and engages inside the limit slot. This utility model relates to the field of plastic injection mold technology. This quick-release mechanism for plastic injection molds solves the problems of existing quick-release mechanisms for injection molds having complex assembly and disassembly structures, high manufacturing costs, and inconvenience in flexibly adjusting the mold position during installation, thus limiting their use.

[0005] In order to solve one of the above problems, this application provides a quick-release structure for injection molds. Utility Model Content

[0006] The purpose of this utility model is to solve the problems existing in the prior art and to propose a quick-release structure for injection molds. Its structure is simple in design, does not require disassembly together with the ejection and reset transmission structure, does not require opening the lower mold plate frame, is easy to replace, and is highly efficient.

[0007] To achieve the above objectives, the present invention adopts the following technical solution: a quick-release structure for injection molds, which is installed on a mold frame and includes an ejection and reset transmission structure installed inside the mold frame. It also includes an inner mold structure, which includes an inner mold, an ejection mechanism, and an intermediate structure. The inner mold is fixed to the lower mold plate of the mold frame. The ejection mechanism is installed inside the inner mold and detachably connected to the intermediate structure. The intermediate structure is movably installed in the cavity between the lower mold plate and the inner mold and detachably connected to a transmission connecting rod. The transmission connecting rod passes through the lower mold plate and is fixed to the ejection and reset transmission structure.

[0008] Furthermore, as described above, the ejection mechanism is connected to the intermediate structure via a fourth screw, and the intermediate structure is connected to the transmission connecting rod after passing through the inner mold via a fifth screw.

[0009] Furthermore, as described above, the intermediate structure includes an auxiliary connecting plate located within the lower template, a fourth screw threadedly connecting the auxiliary connecting plate and the ejection mechanism, and a fifth screw threadedly connecting the auxiliary connecting plate and the transmission connecting rod.

[0010] Furthermore, as described above, the fifth screw is threaded onto the rod portion of the transmission connecting rod, and the end of the transmission connecting rod is fixed within the ejection and reset transmission structure.

[0011] Furthermore, as described above, the ejection mechanism includes an ejector pin, an ejector plate, and an ejector pin fixing plate. The rod of the ejector pin penetrates the inner mold, and the end of the ejector pin is fixed between the ejector plate and the ejector pin fixing plate. The ejector plate and the auxiliary connecting plate are connected and fixed together by a fourth screw.

[0012] Furthermore, as described above, the ejector pin fixing plate is movably installed in the cavity between the inner mold and the lower mold plate.

[0013] Furthermore, as described above, the ejector plate and the ejector fixing plate are fixed together by bolts, and the ejector fixing plate is machined with a stepped through hole to accommodate the ejector pin.

[0014] Furthermore, as described above, the inner mold includes a support plate, an intermediate plate, and a cavity. A cavity for accommodating an ejector pin fixing plate is installed between the support plate and the intermediate plate. The ejector pin plate moves through the support plate, and the rod of the ejector pin passes through the ejector pin fixing plate, the intermediate plate, and the cavity in sequence.

[0015] Furthermore, as described above, the concave mold is limited and fixed by the step position of the first clamping block and the second clamping block respectively. The side of the first clamping block contacts the first extrusion block. The first extrusion block is fixed to the lower template by the second screw. The side of the second clamping block contacts the second extrusion block. The second extrusion block is fixed to the lower template by the third screw.

[0016] Furthermore, as described above, the first clamping block, the intermediate plate, and the support plate are fixed together by bolts and then fixed to the lower template by the first screw passing through them in sequence. The second clamping block, the intermediate plate, and the support plate are all machined with coaxial mounting holes for the fifth screw to pass through.

[0017] Compared with the prior art, the beneficial effects of this utility model are: the structure of this device is simple. By disassembling the fourth and fifth screws, the inner mold structure and the ejection reset transmission structure can be separated without disassembling the ejection reset transmission structure together. The operation is simple. For the use scenario of multiple part numbers and common mold frame, the disassembly and assembly efficiency is high and the maintenance cost is low.

[0018] Compared to conventional quick-release structures, the lower mold plate does not require an open frame, and the inner mold has better support during injection molding, which can withstand injection pressure to a greater extent and reduce quality problems such as mold deformation and product burrs. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the structure of this utility model; Figure 2 for Figure 1 A cross-sectional view along the AA direction; Figure 3 This is a schematic diagram of the quick-release structure before the improvement. Figure 4 for Figure 3 A cross-sectional view along the BB direction.

[0020] In the diagram: 1. Injection molded part; 2. First screw; 3. Second screw; 4. First clamping block; 5. First pressing block; 6. Ejector pin; 7. Ejector plate; 8. Auxiliary connecting plate; 9. Third screw; 10. Second clamping block; 11. Lower mold plate; 12. Fourth screw; 13. Fifth screw; 14. Transmission connecting rod; 15. Second pressing block; 16. Die; 17. Intermediate plate; 18. Support plate; 19. Ejector pin fixing plate; 20. Ejection and reset transmission structure. Detailed Implementation

[0021] In the description of this utility model, it should be understood that the terms "upper," "lower," "front," "rear," "left," "right," "top," "bottom," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0022] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "fixed," "installed," "connected," "set," etc., should be interpreted broadly. For example, when an element is said to be "fixed to" another element, it can be directly on the other element or there may be an intervening element. When an element is said to be "installed" on another element, it can be directly installed on the other element or there may be an intervening element. When an element is said to be "connected" to another element, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be a connection within the two elements.

[0023] Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0024] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0025] like Figure 3 and Figure 4As shown, the original quick-release structure involved removing the inner mold forming part, ejection system, and related structures as a single unit from the mold frame (fixed on the injection molding machine) for multi-part number switching production and maintenance. This required integrating 2-4 ejector plates 7 and related positioning and ejection reset transmission structures 20 with the inner mold forming structure and removing them from the lower mold of the injection mold (the ejection reset transmission structure 20 generally includes multiple ejector plates, center support, return pins, return springs, and related locking parts, which is a conventional technology). This resulted in an excessively large overall quick-release structure, and the weight made it difficult to remove from the lower mold on the injection molding machine using only one force. This replacement process not only consumed a lot of manpower and resources but also wasted valuable production time. Furthermore, the operation of the upper and lower molds was cumbersome, dangerous, and prone to accidents. In order to avoid the top plate, the original quick-release structure required a frame to be opened on the B plate of the mold base, which resulted in poor support strength for the inner mold, especially for multi-cavity and multi-assembly insert products. During injection molding, it was difficult to withstand the injection pressure, which easily caused the sheet metal to deform and resulted in defective burrs on the injection molded part 1. In addition, for the case of long ejector pins 6, especially when the ejector pins 6 are less than Ø1.2mm, the ejection force is insufficient and they are easy to break during the ejection process.

[0026] Example 1 Reference Figure 1-2 As shown, this utility model discloses a quick-release structure for injection molds. The quick-release structure is installed on a mold frame and includes an ejection and reset transmission structure 20, which is installed inside the mold frame (a mature existing technology). It also includes an inner mold structure, which includes an inner mold, an ejection mechanism, and an intermediate structure. The inner mold is fixed on the lower mold plate 11 of the mold frame. The ejection mechanism is installed inside the inner mold and detachably connected to the intermediate structure. The intermediate structure is movably installed in the cavity between the lower mold plate 11 and the inner mold and is detachably connected to a transmission connecting rod 14. The transmission connecting rod 14 passes through the lower mold plate 11 and is fixed on the ejection and reset transmission structure 20.

[0027] This application indirectly drives the ejection mechanism to work by transmitting / bearing the ejection force of the ejection reset transmission structure 20 through the intermediate structure. On the one hand, it can directly disconnect from or maintain the connection with the ejection reset transmission structure 20. Disconnection and disassembly can reduce the weight of the entire quick-release structure. Installation is also simple and replacement is efficient. On the other hand, it can shorten the length of the ejector pin 6 to improve the strength of the ejector pin 6, increase fatigue resistance and make its service life longer.

[0028] Example 2 Reference Figure 1-2As shown, based on the technical solution of Embodiment 1, a quick-release structure for injection molds is provided. The ejection mechanism is connected to an intermediate structure via a fourth screw 12, and the intermediate structure is connected to a transmission connecting rod 14 via a fifth screw 13 passing through the inner mold. Specifically, the intermediate structure includes an auxiliary connecting plate 8 located within the lower mold plate 11. The fourth screw 12 is threadedly connected to the auxiliary connecting plate 8 and the ejection mechanism, and the fifth screw 13 is threadedly connected to the auxiliary connecting plate 8 and the transmission connecting rod 14.

[0029] Furthermore, the fifth screw 13 is threadedly connected to the rod portion of the transmission connecting rod 14, and the end of the transmission connecting rod 14 is fixed within the ejection and reset transmission structure 20.

[0030] Regarding the structural design of the ejection mechanism, the ejection mechanism includes an ejector pin 6, an ejector plate 7, and an ejector pin fixing plate 19. The rod of the ejector pin 6 penetrates the inner mold, and the end of the ejector pin 6 is fixed between the ejector plate 7 and the ejector pin fixing plate 19. The ejector plate 7 is connected and fixed together with the auxiliary connecting plate 8 by a fourth screw 12. In addition, the ejector pin fixing plate 19 is movably installed in the cavity between the inner mold and the lower mold plate 11. Furthermore, the ejector plate 7 and the ejector pin fixing plate 19 are fixed together by bolts, and the ejector pin fixing plate 19 has a stepped through hole for accommodating the ejector pin 6.

[0031] Example 3 Reference Figure 1-2 As shown, based on the technical solution of the above embodiment, a quick-release structure for injection molds, for the structural design of the inner mold, the inner mold includes a support plate 18, an intermediate plate 17, and a cavity 16. A cavity for accommodating an ejector pin fixing plate 19 is installed between the support plate 18 and the intermediate plate 17. The ejector pin plate 7 movably passes through the support plate 18, and the rod of the ejector pin 6 sequentially passes through the ejector pin fixing plate 19, the intermediate plate 17, and the cavity 16. Further, the cavity 16 is limited and fixed by the stepped positions of the first clamping block 5 and the second clamping block 15, respectively. The side of the first clamping block 5 contacts the first extrusion block 4, and the first extrusion block 4 is fixed to the lower template 11 by the second screw 3. The side of the second clamping block 15 contacts the second extrusion block 10, and the second extrusion block 10 is fixed to the lower template 11 by the third screw 9. Furthermore, the first clamping block 5, the intermediate plate 17, and the support plate 18 are fixed together by bolts and then sequentially fixed to the lower template 11 by the first screw 2. The second clamping block 15, the intermediate plate 17, and the support plate 18 are all machined with coaxial mounting holes for the fifth screw 13 to pass through. By removing the fourth screw 12 and the fifth screw 13, the inner mold structure can be separated from the ejection and reset transmission structure 20, achieving a quick disassembly and assembly operation.

[0032] To meet the production needs of part number switching and facilitate mold maintenance and repair, existing quick-release structures (such as...) Figure 3 and Figure 4 The design (shown) has been improved by separating the ejector return transmission structure from the inner mold forming section into two components. The ejector pin 6 and ejector plate 7 are cleverly designed inside the inner mold. The B plate (lower mold plate 11) of the mold base does not need to be open, allowing the inner mold to better fit the bottom of the B plate frame, providing better support. This structure also allows for more support pillars within the ejector plate 7, enabling it to withstand injection pressure better during injection molding and reducing mold deformation. The auxiliary connecting plate 8 is connected to the ejector plate 7 inside the inner mold using the fourth screw 12. Only the inner mold is first installed into the frame cavity of the lower mold plate 11, and then the first extrusion plate in the length and width directions is installed. Tighten the first screw 2, the second screw 3, and the third screw 9 to fix the inner mold to the lower template 11. Then, use the fifth screw 13 to lock the auxiliary connecting plate 8 inside the inner mold to the ejection and reset transmission structure 20 inside the mold frame via the transmission connecting rod 14. When switching parts or performing production maintenance, it is not necessary to remove the ejection and reset transmission mechanism (i.e., the top plate, return pin, return structure, related secondary ejection mechanism, the middle support for positioning the top plate and the mold frame, springs, and other related auxiliary components of the rear mold part of the mold frame), making the weight of the replaceable part of the rear mold lighter. For inner molds with many cavities and large product layouts, this structure can reduce the need for the original plastic mold frame to return, position, upper and lower top plates, and related secondary ejection mechanisms when switching the rear mold part, which can greatly reduce the weight. This makes it more convenient, faster, safer, and more stable for fitters when repairing molds and switching multiple parts. The quick-release part also has no local protrusions. It is important to note that the height error range of the ejector pin of the ejector reset transmission mechanism inside the mold frame must be within 0.01 mm to prevent the ejector plate 7 inside the inner mold from getting stuck after the auxiliary connecting plate 8 is locked with the fifth screw 13. All positioning and motion mechanisms must work smoothly together.

[0033] In this utility model device, when the quick-release structure needs to be replaced, it is only necessary to remove the screws connecting the intermediate structure to separate the inner mold structure from the ejection and reset transmission structure. Specifically, the separation of the inner mold structure from the ejection and reset transmission structure can be achieved by disassembling the fourth screw 12 and the fifth screw 13. The assembly and fit relationships of the various components involved, the main components of the mold frame and lower mold such as the die 16, the ejection mechanism, and the ejection and reset transmission mechanism, are existing technologies or materials. Technical personnel can directly purchase or order these from the market according to the required product model and specifications.

[0034] The above description is merely a preferred embodiment of this utility model, and common knowledge regarding specific structures and characteristics is not described in detail here. It is obvious to those skilled in the art that this utility model is not limited to the details of the above embodiments, and that it can be implemented in other specific forms without departing from the spirit or basic characteristics of this utility model. Therefore, the embodiments should be considered exemplary and non-limiting in all respects. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in this utility model, based on the technical solution and inventive concept of this utility model, should be included within the protection scope of this utility model.

Claims

1. A quick-release structure for an injection mold, the quick-release structure being mounted on a mold base, comprising an ejection and reset transmission structure (20), said ejection and reset transmission structure (20) being mounted inside the mold base, characterized in that, It also includes an inner mold structure, which includes an inner mold, an ejection mechanism and an intermediate structure. The inner mold is fixed on the lower template (11) of the mold frame. The ejection mechanism is installed inside the inner mold and is detachably connected to the intermediate structure. The intermediate structure is movably installed in the cavity between the lower template (11) and the inner mold and is detachably connected to the transmission connecting rod (14). The transmission connecting rod (14) passes through the lower template (11) and is fixed on the ejection reset transmission structure (20).

2. The quick-release structure for injection molds according to claim 1, characterized in that, The ejection mechanism is connected to the intermediate structure via the fourth screw (12), and the intermediate structure is connected to the transmission connecting rod (14) after passing through the inner mold via the fifth screw (13).

3. The quick-release structure for injection molds according to claim 2, characterized in that, The intermediate structure includes an auxiliary connecting plate (8) located in the lower template (11), a fourth screw (12) threadedly connecting the auxiliary connecting plate (8) and the ejection mechanism, and a fifth screw (13) threadedly connecting the auxiliary connecting plate (8) and the transmission connecting rod (14).

4. A quick-release structure for injection molds according to claim 3, characterized in that, The transmission connecting rod (14) is threadedly connected to the fifth screw (13), and the end of the transmission connecting rod (14) is fixed in the ejection and reset transmission structure (20).

5. A quick-release structure for injection molds according to claim 3, characterized in that, The ejection mechanism includes an ejector pin (6), an ejector plate (7), and an ejector fixing plate (19). The rod of the ejector pin (6) passes through the inner mold, and the end of the ejector pin (6) is fixed between the ejector plate (7) and the ejector fixing plate (19). The ejector plate (7) and the auxiliary connecting plate (8) are connected and fixed together by a fourth screw (12).

6. A quick-release structure for injection molds according to claim 5, characterized in that, The ejector pin fixing plate (19) is movably installed in the cavity between the inner mold and the lower mold plate (11).

7. A quick-release structure for injection molds according to claim 6, characterized in that, The ejector plate (7) and the ejector fixing plate (19) are fixed together by bolts, and the ejector fixing plate (19) has a stepped through hole for accommodating the ejector (6).

8. A quick-release structure for injection molds according to claim 5, characterized in that, The inner mold includes a support plate (18), an intermediate plate (17) and a cavity (16). A cavity for accommodating an ejector pin fixing plate (19) is installed between the support plate (18) and the intermediate plate (17). The ejector pin plate (7) is movably inserted through the support plate (18). The rod of the ejector pin (6) passes through the ejector pin fixing plate (19), the intermediate plate (17) and the cavity (16) in sequence.

9. A quick-release structure for injection molds according to claim 8, characterized in that, The concave mold (16) is fixed by the step position of the first clamping block (5) and the second clamping block (15). The side of the first clamping block (5) contacts the first extrusion block (4). The first extrusion block (4) is fixed on the lower template (11) by the second screw (3). The side of the second clamping block (15) contacts the second extrusion block (10). The second extrusion block (10) is fixed on the lower template (11) by the third screw (9).

10. A quick-release structure for injection molds according to claim 9, characterized in that, The first clamping block (5), the intermediate plate (17) and the support plate (18) are fixed together by bolts and then fixed on the lower template (11) by the first screw (2) passing through them in sequence. The second clamping block (15), the intermediate plate (17) and the support plate (18) are all machined with coaxial mounting holes for the fifth screw (13) to pass through.

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