Composite core-pulling forming mechanism and injection mold

Abstract

The invention discloses a composite core-pulling forming mechanism and an injection mold. The composite core-pulling forming mechanism comprises a first core-pulling assembly and a second core-pulling assembly, and the first core-pulling assembly limits the second core-pulling assembly to conduct core-pulling operation through an elastic block so as to control the core-pulling movement of the first core-pulling assembly to be earlier than the core-pulling movement of the second core-pulling assembly. Besides, a positioning ejector pin is further assembled in the second core-pulling assembly, the positioning ejector pin abutting against the product moves relative to the forming block for core-pulling displacement, the product is pressed through the positioning ejector pin at the structure position of dense through holes of the product, and the technical problem that core-pulling strain is caused due to mold sticking is solved. In conclusion, on the basis of the structural design, effective demolding of products with dense through holes is achieved, meanwhile, one-time injection molding of products with adjacent through hole structures can be achieved, and the integrity and the qualified rate of the demolded products can be guaranteed.

Description

Technical Field

[0001] The invention relates to the field of injection molds, and in particular to a composite core-pulling molding mechanism and an injection mold. Background Art

[0002] The injection mold with core pulling mechanism is mainly designed for the molding of through holes or groove structures on products, so as to achieve the purpose of one-time injection molding of products, improve processing efficiency and reduce processing costs.

[0003] Most existing products have dense through holes on their surfaces to penetrate the air inside and outside the product to achieve air intake or exhaust, etc. During the one-time injection molding process, such dense through holes have the characteristics of small area, multiple through holes and dense distribution, so the thickness of such products is often thin (similar to Figure 7 In the case of the product shown in the figure, the molding block and the product are prone to mold sticking during the core pulling process of the one-time injection molding process. Based on the above situation, the core is pulled and separated continuously, and the product is prone to core pulling damage. In particular, the product has a through-hole structure adjacent to the dense through-holes while having dense through-holes, which greatly increases the difficulty of the one-time injection molding of the product.

[0004] In summary, how to solve the technical problem in the prior art that a plurality of adjacent through-hole structures, one of which is a dense through-hole, is easily caused to core-pulling damage during the core-pulling process is one of the important technical problems that technicians in this field need to solve. Summary of the invention

[0005] In order to solve the technical problems existing in the prior art, the purpose of the present invention is to provide a composite core-pulling molding mechanism and an injection mold.

[0006] To achieve the above object, the present invention adopts the following technical solutions:

[0007] A composite core-pulling molding mechanism comprises a first core-pulling assembly and a second core-pulling assembly, wherein:

[0008] The first core pulling assembly includes a first slider, a shovel and a spring block, the shovel passes through the first slider and is connected to the spring block, and the spring block presses the second slider of the second core pulling assembly to control the first core pulling assembly to perform core pulling movement before the second core pulling assembly;

[0009] The second core pulling assembly comprises a forming block, a second slide rail, a positioning ejector and the second slider; the forming block is connected to the second slider and moves synchronously with the core pulling, and the second slider is slidably mounted on the second slide rail to achieve the core pulling displacement; the positioning ejector can pass through the forming block to abut against the product, and is fixedly mounted by a positioning piece;

[0010] The forming block and the second slider perform core pulling displacement synchronously, and the positioning ejector pushes against the product to cooperate with the separation of the forming block from the product surface to complete the core pulling operation.

[0011] Further preferably, the second slider is equipped with a linkage slider, the forming block is embedded in the end of the linkage slider, and the linkage slider slides synchronously with the second slider and the forming block;

[0012] An ejection cavity is arranged in the linkage slide block, and the positioning ejector pin is assembled in the ejection cavity.

[0013] Further preferably: the positioning ejector pin is fixed on a positioning ejector pin plate assembly, and the positioning ejector pin plate assembly is fixedly connected to the positioning member;

[0014] The positioning ejector plate assembly is movably installed in the ejection cavity;

[0015] The second slider, linkage slider and forming block that perform core pulling displacement synchronously cooperate with the relatively fixed positioning ejector plate group and positioning ejector to separate the forming block from the product surface and complete the core pulling operation.

[0016] Further preferably, the positioning member comprises a positioning rod and a positioning seat, the positioning seat is embedded in the embedding groove of the second slide rail, and the positioning rod is connected to the positioning seat.

[0017] Further preferably, the shovel is connected to the spring block via a draw hook to pull the spring block to move in a direction away from the second sliding block.

[0018] Further preferably, the second sliding block is installed with a screw, and the screw is sleeved with a spring.

[0019] Further preferably: the spring block presses against the screw;

[0020] The compressed energy-storing spring pushes the elastic block to move in a direction away from the second sliding block through the pushing screw.

[0021] Further preferably, the second sliding block is connected to a driving member, and is driven by the driving member to perform a reciprocating sliding displacement along the direction of the second slide rail to achieve sliding core pulling or sliding resetting.

[0022] An injection mold comprises a mold frame, a mold core and the above-mentioned composite core-pulling molding mechanism, wherein:

[0023] The mold frame includes a movable mold group and a static mold group, and the mold core includes a movable mold core and a static mold core;

[0024] The movable mold core and the moving mold core are fixedly connected to the movable mold group and the static mold group respectively;

[0025] The shovel of the first core pulling assembly in the composite core pulling molding mechanism is connected and linked to the static die set, and the second slide rail of the second core pulling mechanism in the composite core pulling molding mechanism is fixedly connected to the movable die set.

[0026] Further preferably, it also includes a third core pulling assembly, a fourth core pulling assembly and a fifth core pulling assembly, wherein:

[0027] The third core-pulling assembly is arranged relative to the composite core-pulling forming mechanism;

[0028] The fourth core pulling assembly and the fifth core pulling assembly are arranged opposite to each other.

[0029] After adopting the above technical solution, the present invention has the following advantages compared with the background technology:

[0030] The present invention designs a first core pulling component and a second core pulling component, and the first core pulling component limits the second core pulling component to perform core pulling operation through a spring block, so as to control the core pulling movement of the first core pulling component to precede the core pulling movement of the second core pulling component; in addition, the second core pulling component is also equipped with a positioning ejector, which pushes the positioning ejector of the product to relatively displace with the forming block of the core pulling displacement, and presses the product at the structure of dense through holes of the product through the positioning ejector to avoid the technical problem of core pulling damage caused by mold sticking. In summary, based on the above structural design, effective demolding of products with dense through holes can be achieved, and one-time injection molding of products with adjacent through hole structures can be achieved, and the integrity and qualified rate of demolded products can also be ensured. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 It is a structural stereoscopic schematic diagram of the composite core-pulling forming mechanism described in an embodiment of the present invention;

[0032] Figure 2 yes Figure 1 A front view of the structure shown;

[0033] Figure 3 yes Figure 2 a top view of the structure shown;

[0034] Figure 4 is a structural cross-sectional view of the composite core-pulling forming mechanism described in an embodiment of the present invention;

[0035] Figure 5 The structure of the injection mold equipped with the composite core-pulling molding mechanism in the embodiment of the present invention is shown in FIG. Figure 1 ;

[0036] Figure 6 The structure of the injection mold equipped with the composite core-pulling molding mechanism in the embodiment of the present invention is shown in FIG. Figure 2 ;

[0037] Figure 7 It is a schematic diagram of the structure of product A manufactured by the injection mold of the present invention.

[0038] The symbols of the drawings in the above specification are explained as follows:

[0039] 100-first core pulling assembly; 110-first slider; 120-shovel; 130-spring block; 140-screw; 150-spring;

[0040] 200-second core pulling assembly; 210-linked slider; 211-linked slide seat; 212-linked slide body; 220-positioning ejector assembly; 221-positioning ejector plate assembly; 222-positioning ejector; 230-forming block; 240-positioning member; 241-positioning rod; 242-positioning seat; 250-driving member; 260-second slider; 270-second slide rail;

[0041] 310-static mold top plate; 320-static mold pad; 330-static mold plate;

[0042] 410-movable mold plate; 420-movable mold pad; 430-movable mold bottom plate; 440-thrust plate assembly; 450-thrust pin; 460-square iron;

[0043] 510-Static mold core; 520-Dynamic mold core;

[0044] 610-third shovel; 620-third slide block;

[0045] 710-the fourth shovel; 720-the fourth slide block;

[0046] 810-fifth shovel; 820-fifth slide block;

[0047] A-product; A1-product face; A2-product first hole; A3-product second hole; A4-product third hole. DETAILED DESCRIPTION

[0048] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0049] It should be noted that in the present invention, the terms "up", "down", "left", "right", "vertical", "horizontal", "inside", "outside", etc. are based on the orientation or position relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element of the present invention must have a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0050] Example

[0051] For products with multiple through holes, multiple core pulling components are often used to adapt to the molding process during the one-time injection molding process. However, two adjacent through holes have a dense through hole, which is very likely to cause the product to be strained during the core pulling molding process. Therefore, the inventor has developed a composite core pulling molding mechanism, which is composed of a first core pulling component 100 and a second core pulling component 200 connected to form a mechanism that restricts and cooperates with each other to perform core pulling molding processing, so as to solve the above structural problem.

[0052] like Figure 1 , Figure 2 , Figure 3 and Figure 4 As shown, the second core pulling assembly 200 is the main structure for realizing the dense through hole core pulling forming processing, which includes a linkage slider 210, a second slider 260, a driving member 250, a second slide rail 270 and a positioning ejector group 220; the second slider 260 is assembled on the second slide rail 270, and can slide back and forth on the second slide rail 270 to realize sliding core pulling and sliding reset; the linkage slider 210 is connected to the second slider 260 and slides synchronously; the positioning ejector group 220 is assembled in the linkage slider 210, and can slide in the linkage slider 210 In other words, the linkage slider 210 and the positioning ejector pin group 220 are designed to be in a relative motion relationship. The effect achieved by this structural design is that when the positioning ejector pin group 220 is relatively fixed, the linkage slider 210 slides relative to the positioning ejector pin group 220. Based on the above structural design, when the linkage slider 210 equipped with the forming block 230 is driven by the driven member 250 to perform core pulling displacement, the positioning ejector pin group 220 can be relatively fixed and pressed against the surface of the formed product, thereby effectively solving the technical problem of core pulling damage caused by the forming block 230 being pulled as a whole.

[0053] To achieve the above functions, the positioning ejector pin group 220 is relatively fixed by the positioning member 240. The specific structure is as follows: Figure 1 , Figure 2 , Figure 3 and Figure 4 As shown, the positioning ejector assembly 220 includes a positioning ejector plate assembly 221 and a positioning ejector 222. The positioning ejector 222 is fixedly mounted on the ejector plate assembly 440. The positioning ejector 222 passes through the molding block 230 and can abut against the product after injection molding to position the product and effectively avoid core pulling. The positioning member 240 includes a positioning rod 241 and a positioning seat 242. The positioning seat 242 is fixedly connected to the second slide rail 270. The positioning seat 242 is connected to the positioning ejector plate assembly 221 through the positioning rod 241, so as to realize the relative motion relationship between the positioning ejector assembly 220 and the linkage slider 210.

[0054] Detailed: Figure 1 , Figure 2 , Figure 3 and Figure 4 As shown, when the driving member 250 drives the linkage slider 210 to slide and pull the core through the second slider 260, the positioning seat 242 is fixed on the second slide rail 270, and the second slide rail 270 and the second slider 260 are in a relative sliding displacement relationship. The positioning ejector plate group 221 is fixedly connected to the positioning seat 242 through the positioning rod 241 and is also relatively fixed. At this time, the positioning ejector 222 is also relatively fixed; a relative motion relationship is formed between the linkage slider 210 that performs the core pulling sliding displacement and the positioning ejector group 220. In the process of the linkage slider 210 driving the forming block 230 to pull the core and demold, the positioning ejector group 220 is pressed against the product, which effectively solves the technical problem of core pulling damage caused by the forming block 230 being pulled as a whole.

[0055] like Figure 1 , Figure 2 , Figure 3 and Figure 4 As shown, the linkage slider 210 is to provide a space for relative sliding displacement with the positioning ejector group 220. In terms of structure, the linkage slider 210 is formed by connecting the linkage slider 211 and the linkage slide body 212. Specifically, the linkage slider 211 is connected to the second slider 260 and driven by the second slider 260 to perform synchronous sliding displacement. The linkage slider 211 is a hollow body and its side facing away from the second slider 260 is an open surface; the linkage slide body 212 is a through body, which is buckled at the open surface of the linkage slider 211 and embedded in the molding block 230 at the opening away from the linkage slider 211. The molding block 230 is provided with dense protrusions toward the product molding cavity of the mold for dense through-hole molding. The dense protrusions protrude from the linkage slider 210. The molding block 230 is provided with through holes that allow the positioning ejector 222 to be ejected. In this embodiment, an end of the second sliding block 260 away from the driving member 250 is designed with an inclined surface, and the linkage sliding seat 211 is fixed on the inclined surface to match the position of the product molding cavity of the mold.

[0056] like Figure 1 , Figure 2 , Figure 3 and Figure 4 As shown, the positioning ejector plate group 221 includes a positioning ejector base plate and a positioning ejector panel which are fixedly connected to each other and displace synchronously. The positioning ejector 222 is fixed on the positioning ejector base plate and passes through the positioning ejector panel. The positioning ejector 222 is penetrated in the ejection through hole and passes through the ejection through hole to position and support the product during the core pulling operation driven by the linkage slider 210 to drive the forming block 230, thereby effectively preventing the product from being strained during the core pulling and demolding process.

[0057] It should be noted that: Figure 4 As shown, the opening of the positioning through holes is adapted to the distribution of the positioning ejector pins 222 , two or more positioning through holes are opened between adjacent positioning protrusions, and the positioning ejector pins 222 abut against the connection between adjacent dense through holes.

[0058] To solve the problem of how to adapt to the structure of opening adjacent through holes on the product, and one through hole is a dense through hole, such as Figure 1 , Figure 2 , Figure 3 and Figure 4 As shown, a first core pulling assembly 100 and a second core pulling assembly 200 are designed, and the first core pulling assembly 100 is placed on the second core pulling assembly 200 to limit the sliding core pulling movement of the second core pulling mechanism. Specifically: the spring block 130 in the first core pulling mechanism is used to stop the core pulling movement of the second slider 260 of the second core pulling assembly 200 when it is not driven; in other words, only after the spring block 130 is driven away from the second slider 260, the second slider 260 can be driven to perform the core pulling molding movement. The setting of this structure is used to determine the movement sequence between the first core pulling assembly 100 and the second core pulling assembly 200.

[0059] like Figure 4 As shown, the first core pulling assembly 100 includes a first slider 110 and a spring block 130. The first slider 110 limits the second slider 260 to slide along the second slide rail 270 through the spring block 130, that is, the spring block 130 is stuck on the second slider 260 to accurately position the second slider 260. Figure 4 As shown, the first slider 110 is located above the second slider 260, and the first slider 110 is installed with a shovel 120. The bottom of the shovel 120 is connected and linked to the spring block 130 through a hook, and one end of the spring block 130 is against the second slider 260, thereby limiting the sliding displacement of the second slider 260.

[0060] Based on the above structure: Figure 4 As shown, the first slider 110 is connected with the shovel 120, and the mold opening action drives the shovel 120 to move upward, thereby driving the first slider 110 to slide and pull the core. At the same time, the driven shovel 120 pulls the spring block 130 and the shovel 120 to move upward synchronously through the hook. When the spring block 130 is completely separated from the second slider 260 and the second slider 260 is in an unrestricted state, the second slider 260 can be driven by the driving member 250 to move the core.

[0061] like Figure 4As shown, in order to ensure that the shovel 120 can effectively drive the elastic block 130 to move upward synchronously, a screw 140 is installed on the second slider 260, and the screw 140 is equipped with a spring 150; the end of the elastic block 130 close to the second slider 260 presses on the screw 140. Based on the above structure, when the composite core-pulling forming mechanism does not start the core-pulling movement, the elastic block 130 in a static state presses on the screw 140, and the spring 150 mounted on the screw 140 is in a compressed energy storage state; after starting the core-pulling action, the upward shovel 120 drives the elastic block 130 through the hook, and the compressed energy-accumulated spring 150 releases its capacity, and synchronously pushes the elastic block 130 to move upward synchronously. In other words: in order to ensure that the elastic block 130 can effectively move upward away from the second elastic block 130, two forces act on the elastic block 130, one force is the pulling force of the shovel 120, and the other force is the elastic thrust of the screw 140 equipped with the spring 150.

[0062] In summary, combined Figures 1 to 4 As shown, the action principle of the composite core-pulling forming mechanism is as follows:

[0063] Action 1: The first core pulling assembly 100 performs core pulling displacement:

[0064] The mold opening action drives the shovel 120. The driven shovel 120 can drive the first slider 110 to move the core while pulling the spring block 130 through the hook. At the same time, the compressed and energy-storing spring 150 drives the screw 140 to push the spring block 130 and the shovel 120 to move synchronously, thereby moving away from the second slider 260 to release the second slider 260.

[0065] Action 2: The second core pulling assembly 200 performs core pulling displacement;

[0066] The driving member 250 drives the released second slider 260 to move along the direction of the second slide rail 270, and the slidingly displaced second slider 260 drives the linkage slider 210 and the forming block 230 to move synchronously; at this time, the positioning ejector group 220 in the linkage slider 210 is relatively fixed by the positioning member 240, that is, a relative displacement state is formed between the positioning ejector group 220 and the linkage slider 210, the linkage slider 210 slides and displaces, and the positioning ejector group 220 is relatively fixed; the linkage slider 210 that performs core pulling and sliding displacement forms a relative motion relationship with the positioning ejector group 220, and during the process of the linkage slider 210 driving the forming block 230 to pull the core and demold, the positioning ejector group 220 presses against the product, and the technical problem of core pulling caused by the forming block 230 being pulled as a whole is solved.

[0067] To manufacture Figure 7 For the product A, an injection mold is designed. Figure 7As shown, the product A is bent as a whole, and has a product face A1, a first product hole A2, a second product hole A3, and a third product hole A4. The product face A1 is a dense through hole, and the dense through hole is composed of a plurality of through holes, and the plurality of through holes are densely distributed; the first product hole A2 and the second product hole A3 are respectively opened at the two ends of the product A, and the third product hole A4 is located on the side of the product A, and the third holes of the two products A are arranged adjacent to each other. In order to be suitable for the structural design of the product A with openings on all four sides, the injection mold needs to be designed with a core-pulling structure that is compatible with the structure of the product A, so as to realize one-time injection molding of the product A. It should be noted that in order to be suitable for the dense through hole molding processing such as the product face A1, the above-mentioned composite core-pulling molding mechanism is applied.

[0068] like Figure 5 and Figure 6 As shown, the injection mold includes a mold frame, a mold core and the composite core-pulling molding mechanism, and the mold core and the composite core-pulling molding mechanism are installed in conjunction with the mold frame; the mold core includes a static mold core 510 and a dynamic mold core 520, and the static mold core 510 and the dynamic mold core 520 are interlocked to form a product molding cavity that is compatible with product A.

[0069] like Figure 5 and Figure 6 As shown, the mold frame includes a static mold group and a dynamic mold group. The static mold group includes a static mold top plate 310, a static mold pad 320 and a static mold plate 330 arranged in sequence, and the static mold core 510 is fixedly connected to the static mold plate 330. The dynamic mold group includes a dynamic mold plate 410, a dynamic mold pad 420, a square iron 460, an ejection mechanism and a dynamic mold bottom plate 430; the two square irons 460 are fixed on the dynamic mold bottom plate 430 and symmetrically distributed, and an ejection cavity is formed between the two square irons 460. The ejector plate group 440 in the ejection mechanism is installed in the ejection cavity, and the ejector 450 is fixed on the ejector plate group 440. The dynamic mold pad 420 is fixedly connected to the two square irons 460, and the dynamic mold plate 410 is fixedly connected to the dynamic mold core 520 and connected to the dynamic mold pad 420. The composite core-pulling molding mechanism is assembled in the moving mold group and cooperates with the product molding cavity to realize the cooperation and formation of the second hole A3 of the product and the surface A1 of the product. In order to realize the processing and forming of the first hole A2 of the product, a third core-pulling assembly is also designed in the mold frame, and in order to realize the processing and forming of the third hole A4 of the product, a fourth core-pulling assembly is designed, and a fifth core-pulling assembly is also provided to cooperate with the molding of product A.

[0070] Combination Figures 1 to 7As shown, in the composite core pulling molding mechanism, the first core pulling assembly 100 is installed in cooperation with the static mold plate 330, the shovel machine 120 in the first core pulling assembly 100 is connected to the static mold plate 330, and the second core pulling assembly 200 is installed in cooperation with the movable mold group. Specifically: the end of the first slider 110 in the first core pulling mechanism is the molding end, and the molding end of the first slider 110 cooperates with the product molding cavity to realize the processing and molding of the first product A hole of product A, and the shovel machine 120 for driving the core pulling displacement of the first slider 110 is connected to the static mold plate 330, and the product A is connected to the spring block 130 through a hook, and the spring block 130 presses against the screw 140 with a spring 150, and the screw 140 is assembled on the second slider 260, and the second slider 260 is slidably connected to the second slide rail 270 Next, the second slide rail 270 is fixed on the static mold pad 320, and the second slider 260 is installed with a linkage slider 210. A positioning ejector group 220 is slidably installed in the linkage slider 210. The positioning ejector plate group 221 in the positioning ejector group 220 is connected to the positioning seat 242 through a positioning rod 241. The positioning seat 242 is fixed in the embedding groove on the bottom surface of the second slide rail 270. The linkage slider 210 is embedded in the molding block 230. The dense protrusions of the molding block 230 extend into the product molding cavity to realize the molding processing of the product surface A1.

[0071] Combination Figures 1 to 7 As shown, the third core pulling assembly is arranged relative to the composite core pulling molding mechanism, and includes a third slider 620 and a third shovel 610. The third shovel 610 is connected to the static mold plate 330, and the third shovel 610 is connected to the third slider 620 to drive the third slider 620 to perform core pulling operation. The fourth core pulling assembly is arranged relative to the fifth core pulling assembly, and the fourth core pulling assembly includes a fourth slider 720 and a fourth shovel 710. The fourth shovel 710 is connected to the static mold plate 330, and the fourth shovel 710 is connected to the fourth slider 720 to drive the fourth slider 720 to perform core pulling operation; the fifth core pulling assembly includes a fifth slider 820 and a fifth shovel 810. The fifth shovel 810 is connected to the static mold plate 330, and the fifth shovel 810 is connected to the fifth slider 820 to drive the fifth slider 820 to perform core pulling operation.

[0072] According to the above injection mold structure, combined with Figures 1 to 7 As shown, the finished product is processed in one go and product A is obtained. The steps of demoulding product A are as follows:

[0073] Step 1: Open the mold.

[0074] The movable die set is driven to move in a direction away from the static die set, wherein the movable die plate 410 in the movable die set drives the movable die core 520 to move in a synchronous manner to open the mold.

[0075] Step 2: Pull the core.

[0076] The composite core-pulling molding mechanism, the third core-pulling assembly, the fourth core-pulling assembly and the fifth core-pulling assembly are all driven by the mold opening displacement to perform core pulling at the same time, as follows:

[0077] The first core pulling assembly 100 in the composite core pulling molding mechanism is driven by the mold opening movement to perform core pulling displacement; the shovel 120 in the first core pulling assembly 100 drives the first slider 110 to perform core pulling displacement due to the mold opening movement;

[0078] The third shovel 610, the fourth shovel 710 and the fifth shovel 810 in the third core pulling assembly, the fourth core pulling assembly and the fifth core pulling assembly are all driven by the mold opening movement to drive the third slider 620, the fourth slider 720 and the fifth slider 820 to perform core pulling displacement;

[0079] It should be noted that the first core pulling assembly 100 and the second core pulling assembly 200 in the composite core pulling molding mechanism are pulled and displaced in sequence. Specifically, the first core pulling assembly 100 is pulled first; when the shovel 120 in the first core pulling assembly 100 is driven by the hook during the mold opening movement, the spring block 130 is also pushed by the elastic energy storage screw 140, thereby moving away from the second slider 260, until the second slider 260 is released, and the released second slider 260 is driven by the driving member 250 to pull and displace the core. The second core-pulling assembly 200 pulls the core backward; when the second slider 260 is driven to move toward the second slide rail 270 for core-pulling, it drives the linkage slider 210; at this time, the positioning ejector group 220 is fixed by the positioning piece 240, and the linkage slider 210 that performs core-pulling displacement drives the forming block 230 to perform core-pulling displacement synchronously. At this time, the fixed positioning ejector 222 presses against the surface of product A, avoiding the strain on the surface A1 of the product during the molding process, thereby solving the technical problems existing in the prior art.

[0080] Step three: eject and demould.

[0081] The ejector plate assembly 440 is driven to move toward the static mold assembly for ejection. The driven ejector plate assembly 440 drives the ejector pin 450 to pass through the movable mold pad 420, the movable mold plate 410 and the movable mold core 520 to eject the product A from the mold. It should be noted that an inclined ejector rod (not shown) is also provided on the ejector plate assembly 440. The inclined ejector rod and the ejector pin 450 are driven by the ejector plate assembly 440 to synchronously perform the ejection operation to realize the ejection of the product A.

[0082] The above is only a preferred specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions that can be easily thought of by a person skilled in the art within the technical scope disclosed by the present invention should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention should be based on the protection scope of the claims.

Claims

1. Composite core-pulling forming mechanism, characterized by: It includes a first core pulling assembly and a second core pulling assembly, wherein: The first core pulling assembly includes a first slider, a shovel and a spring block, the shovel passes through the first slider and is connected to the spring block, and the spring block presses the second slider of the second core pulling assembly to control the first core pulling assembly to perform core pulling movement before the second core pulling assembly; The second core pulling assembly comprises a forming block, a second slide rail, a positioning ejector and the second slider; the forming block is connected to the second slider and moves synchronously with the core pulling, and the second slider is slidably mounted on the second slide rail to achieve the core pulling displacement; the positioning ejector can pass through the forming block to abut against the product, and is fixedly mounted by a positioning piece; The forming block and the second slider perform core pulling displacement synchronously, and the positioning ejector pushes against the product to cooperate with the separation of the forming block from the product surface to complete the core pulling operation.

2. The composite core-pulling forming mechanism according to claim 1, characterized in that: The second slider is equipped with a linkage slider, the forming block is embedded in the end of the linkage slider, and the linkage slider slides synchronously with the second slider and the forming block; An ejection cavity is arranged in the linkage slide block, and the positioning ejector pin is assembled in the ejection cavity.

3. The composite core-pulling forming mechanism according to claim 2 is characterized in that: The positioning ejector pin is fixed on the positioning ejector pin plate assembly, and the positioning ejector pin plate assembly is fixedly connected to the positioning member; The positioning ejector plate assembly is movably installed in the ejection cavity; The second slider, linkage slider and forming block that perform core pulling displacement synchronously cooperate with the relatively fixed positioning ejector plate group and positioning ejector to separate the forming block from the product surface and complete the core pulling operation.

4. The composite core-pulling forming mechanism according to claim 1, characterized in that: The positioning member comprises a positioning rod and a positioning seat. The positioning seat is embedded in the embedding groove of the second slide rail, and the positioning rod is connected to the positioning seat.

5. The composite core-pulling forming mechanism according to claim 1, characterized in that: The shovel is connected to the spring block via a draw hook to pull the spring block to move in a direction away from the second sliding block.

6. The composite core-pulling forming mechanism according to claim 1, characterized in that: The second sliding block is provided with a screw, and the screw is sleeved with a spring.

7. The composite core-pulling forming mechanism according to claim 6, characterized in that: The spring block presses against the screw; The compressed energy-storing spring pushes the elastic block to move in a direction away from the second sliding block through the pushing screw.

8. The composite core-pulling forming mechanism according to claim 1, characterized in that: The second sliding block is connected to the driving member and is driven by the driving member to perform reciprocating sliding displacement along the direction of the second sliding rail to achieve sliding core pulling or sliding resetting.

9. Injection mold, characterized in that: It comprises a mold frame, a mold core and the composite core-pulling molding mechanism according to any one of claims 1 to 8, wherein: The mold frame includes a movable mold group and a static mold group, and the mold core includes a movable mold core and a static mold core; The movable mold core and the moving mold core are fixedly connected to the movable mold group and the static mold group respectively; The shovel of the first core pulling assembly in the composite core pulling molding mechanism is connected and linked to the static die set, and the second slide rail of the second core pulling mechanism in the composite core pulling molding mechanism is fixedly connected to the movable die set.

10. The injection mold according to claim 9, characterized in that: It also includes a third core pulling assembly, a fourth core pulling assembly and a fifth core pulling assembly, wherein: The third core-pulling assembly is arranged relative to the composite core-pulling forming mechanism; The fourth core pulling assembly and the fifth core pulling assembly are arranged opposite to each other.

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