A female mold inclined ejector mechanism

Abstract

The utility model relates to injection mold technical field especially, it relates to a female mould inclined roof mechanism, including front mould fixed plate, front mould board and back mould board, and the front mould board is equipped with front mould kernel, and the back mould board is equipped with back mould kernel, and the female mould inclined roof is set up in the front mould board, and the front mould kernel, back mould kernel and female mould inclined roof form the cavity of product together, the female mould inclined roof includes horizontal part and inclined part, and the horizontal part is located in the front mould board, and the inclined part stretches into the front mould kernel, the front mould kernel includes first fixed part, second fixed part and cavity, and the second fixed part is equipped with through -hole and closed empty hole, and the front mould kernel is equipped with the compression block, and the compression block includes the hanging platform and vertical part, and the vertical part stretches into the through -hole, in the mould closing state, the vertical part contacts with back mould kernel, and the horizontal part contacts with the hanging platform, the horizontal part top is equipped with spring hole, and the spring hole is equipped with spring, and the spring acts on the horizontal part of female mould inclined roof, the utility model discloses reasonable structure is applicable to the injection product with barbed structure, and effectively promotes the demoulding efficiency and mould life.

Description

Technical Field

[0001] This utility model relates to the field of injection mold technology, and in particular to a female mold inclined ejector mechanism. Background Technology

[0002] In injection molding, products with undercut structures are prone to jamming or damage during demolding, affecting production efficiency and product quality. Traditional undercut demolding methods often employ slider mechanisms or hydraulic ejection mechanisms, which are complex, space-consuming, costly to manufacture, and inconvenient to maintain. Especially when undercuts are present in the front mold, the demolding mechanism design becomes even more difficult, often requiring external power or complex transmissions, resulting in unstable operation and slow response. Therefore, there is an urgent need for a simple, reliable, and angled ejector mechanism suitable for undercut demolding in front molds to improve the automation level and production efficiency of molds. Utility Model Content

[0003] The purpose of this invention is to provide a female mold inclined ejector mechanism to solve the problems mentioned in the background art.

[0004] To achieve the above objectives, this utility model provides the following technical solution: a female mold inclined ejector mechanism, comprising a front mold fixing plate, a front template connected to the front mold fixing plate, and a rear template connected to the front template. The front template is provided with a front mold core, and the rear template is provided with a rear mold core. The front mold core and the rear mold core are adjacent to each other. A female mold inclined ejector is provided inside the front template. The front mold core, the rear mold core, and the female mold inclined ejector together form the cavity of the product. The female mold inclined ejector includes a horizontal part and an inclined part. The horizontal part is located in the front template, and the inclined part extends into the front mold core. The mold core includes a first fixing part, a second fixing part, and a cavity. The second fixing part has a through hole and a closed cavity. The front mold core has a clamping block that passes through the cavity and the second fixing part. The clamping block includes a mounting platform and a vertical part, with the vertical part extending into the through hole. In the mold closed state, the vertical part contacts the rear mold core, and the horizontal part contacts the mounting platform. A spring hole is provided above the horizontal part. The spring hole is located in the front template and extends into the front mold fixing plate. A spring is provided in the spring hole, and the spring acts on the horizontal part of the inclined top of the female mold.

[0005] Preferably, the inclined portion is provided with a barb groove for forming a barb on the product.

[0006] Preferably, the length of the barb is 0.5-1.0 mm.

[0007] Preferably, the inclined portion of the female mold top forms an angle with the mold opening direction, the angle being 5°-10°.

[0008] Preferably, the spring is a compression spring, which is in a compressed state when the mold is closed.

[0009] Preferably, the height of the cavity is 10-20 mm.

[0010] Compared with existing technologies, this utility model provides a female mold inclined ejector mechanism, which has the following beneficial effects: This utility model achieves automatic reset and demolding actions by setting a female mold inclined ejector in the front mold plate, and cooperating with a clamping block and a spring. When the mold is closed, the rear mold core presses against the clamping block to fix the female mold inclined ejector, and the spring is in a compressed state; when the mold is opened, the rear mold core disengages, and the spring pushes the female mold inclined ejector to move along the inclined direction, so that it can smoothly disengage from the product undercut. This mechanism has the advantages of compact structure, reliable operation, no need for external power, and strong applicability. It is particularly suitable for the automatic demolding of the front mold undercut, effectively improving the automation level and production efficiency of the mold, while reducing the manufacturing cost and maintenance difficulty of the mold. Attached Figure Description

[0011] Figure 1 This is a schematic diagram of the product structure of this utility model; Figure 2 This is a schematic diagram of the structure of the present invention before injection molding in the mold-closed state; Figure 3 This is a schematic diagram of the injection-molded structure in the mold-closed state of this utility model; Figure 4 This is a schematic diagram of the clamping block structure of this utility model; Figure 5 This is a schematic diagram of the structure of the present invention with the clamping block removed.

[0012] Explanation of reference numerals in the attached drawings: 1. Front mold fixing plate; 2. Front template; 21. Front mold core; 211. First fixing part; 212. Second fixing part; 213. Cavity; 3. Rear template; 31. Rear mold core; 4. Female mold slant ejector; 41. Horizontal part; 42. Inclined part; 5. Product; 51. Cavity; 6. Through hole; 7. Closed hole; 8. Clamping block; 81. Hanging platform; 82. Vertical part; 9. Spring hole; 91. Spring; 10. Barb; 101. Barb groove. Detailed Implementation

[0013] The technical solutions of the present utility model will now be described with reference to the accompanying drawings in the embodiments of the present utility model: like Figure 1-5 As shown, the present invention provides a female mold inclined ejector mechanism, including a front mold fixing plate 1, a front template 2 connected to the front mold fixing plate 1, and a rear template 3 connected to the front template 2. The front template 2 is provided with a front mold core 21, and the rear template 3 is provided with a rear mold core 31. The front mold core 21 and the rear mold core 31 are adjacent to each other. A female mold inclined ejector 4 is provided in the front template 2. The front mold core 21, the rear mold core 31 and the female mold inclined ejector 4 together form the cavity 51 of the product 5.

[0014] The female mold slanted ejector 4 includes a horizontal part 41 and an inclined part 42. The horizontal part 41 is located in the front mold plate 2, and the inclined part 42 extends into the front mold core 21. The inclined part 42 of the female mold slanted ejector 4 forms an angle β with the mold opening direction, where β is 5°-10°, to facilitate oblique demolding during mold opening. The inclined part 42 is provided with a barb groove 101 for forming a product barb 10. The length of the barb 10 is L, which is 0.5-1.0 mm, preferably 0.7 mm.

[0015] The front mold core 21 includes a first fixing part 211, a second fixing part 212, and a cavity 213. The first fixing part 211 and the second fixing part 212 are located on both sides of the inclined part 42, respectively. The second fixing part 212 has a through hole 6 and a closed cavity 7. A clamping block 8 is provided in the front mold core 21, and the clamping block 8 passes through the cavity 213 and the second fixing part 212. The clamping block 8 includes a mounting platform 81 and a vertical part 82, and the vertical part 82 extends into the through hole 6.

[0016] A spring hole 9 is provided above the horizontal part 41. The spring hole 9 is located in the front template 2 and extends into the front mold fixing plate 1. A spring 91 is installed in the spring hole 9. The spring 91 is a compression spring. In the mold closing state, the spring 91 is in a compressed state and stores elastic potential energy. The spring 91 acts on the horizontal part 41 of the female mold inclined ejector 4, providing it with a downward driving force.

[0017] In the mold-closed state, the vertical part 82 of the clamping block 8 contacts the surface of the rear mold core 31, and the horizontal part 41 contacts the mounting plate 81. The rear mold core 31 generates an upward supporting force on the clamping block 8. This supporting force is transmitted through the mounting plate 81 of the clamping block 8, causing the mounting plate 81 to tightly press against the horizontal part 41 of the female mold inclined ejector 4. This securely locks the female mold inclined ejector 4 in a predetermined position during injection molding, preventing it from shifting due to the impact force of the molten plastic and ensuring the dimensional accuracy of the product. At this time, the spring 91 is compressed in the spring hole 9 and is in an energy-storing state.

[0018] The height of cavity 213 is H, which is 10-20mm, preferably 15mm, to provide sufficient movement space for clamping block 8, ensuring that it can effectively clamp and release the female mold inclined ejector 4.

[0019] According to the principle of tangent function, the design of the angle β between the inclined part 42 of the female mold slant ejector 4 and the mold opening direction should take into account L and H, requiring tanβ>L / H, that is, β>arctan(L / H). This is also the principle of the structural parameter design of this utility model, where L is the length of the barb 10 and H is the height of the cavity 213.

[0020] The working process of this utility model is as follows: 1. Mold closing and injection molding stage: The mold closes under the drive of the injection molding machine, with the front mold plate 2 and the rear mold plate 3 closing together. The rear mold core 31 moves forward, and its surface contacts the vertical part 82 of the clamping block 8, pushing the entire clamping block 8 upward. The mounting platform 81 of the clamping block 8 rises accordingly and finally presses against the horizontal part 41 of the female mold slant ejector 4, overcoming the elastic force of the spring 91 and completely fixing the female mold slant ejector 4. At this time, the mold cavity 51 is ready, and molten plastic is injected into the cavity 51, including the barb groove 101 on the female mold slant ejector 4, thereby forming a product 5 with barbs 10.

[0021] 2. Mold opening and demolding stage: After injection molding is completed and the mold is held under pressure and cooled, the mold begins to open.

[0022] Step 1: Template separation. The front template 2 and the rear template 3 are separated first under the pull of the injection molding machine, which in turn causes the front mold core 21 and the rear mold core 31 to separate.

[0023] Step 2: Pressing and releasing. As the rear template 3 moves backward, the rear mold core 31 moves away quickly, and its supporting force on the vertical part 82 of the pressing block 8 disappears instantly.

[0024] Step 3: Spring-driven demolding. The spring 91, which has been compressed, immediately releases its stored elastic potential energy and pushes the horizontal part 41 of the inclined ejector 4 of the female mold downward.

[0025] Step 4: The female mold ejector detaches from the barb. Driven by spring force, the female mold ejector 4 moves downwards. Due to the angle between the inclined portion 42 and the mold opening direction, this downward linear motion is converted into a composite motion that simultaneously involves downward and lateral displacement (away from the product barb 10). Under this motion, the inclined portion 42 of the female mold ejector 4, especially the barb groove 101 portion thereon, quickly detaches from the product barb 10, thus completing the demolding of the barb 10.

[0026] Step 5: Displacement Control. During this process, the clamping block 8 falls due to its own weight, and its mounting platform 81 eventually falls into the closed hole 7 of the front mold core 21, preparing for the next mold closing cycle. The total displacement of the female mold inclined ejector 4 is limited by the height of the cavity 213, ensuring the accuracy and safety of the movement.

[0027] 3. Reset Phase: When the next injection cycle begins, the mold closes again. The rear mold core 31 will contact and lift the clamping block 8 first. The mounting platen 81 of the clamping block 8 will then move upward and press the horizontal part 41 of the female mold inclined ejector 4 again, so that it overcomes the spring force and returns to the working position. At the same time, the spring 91 is recompressed, and the entire mechanism returns to the initial mold closing and locking state, ready for the next injection.

[0028] As can be seen from the above detailed description, the female mold inclined ejector mechanism of this utility model directly drives the clamping block 8 to move upward during mold closing via the rear mold core 31. The clamping block 8's mounting platform 81 applies pressure to the horizontal part 41 of the female mold inclined ejector 4, thereby achieving automatic locking. The built-in spring 91 serves as the power source, enabling automatic and precise demolding during mold opening. The entire mechanism has a compact structure, fully integrated inside the front mold, eliminating the need for external hydraulic or pneumatic devices. Its rapid and reliable response greatly simplifies the mold structure and reduces manufacturing and maintenance costs. It is particularly suitable for situations where the front mold has deep cavities, small barbs, or other difficult demolding conditions, effectively improving production efficiency and mold life.

[0029] The above embodiments are merely some, not all, of the embodiments of this utility model. All other embodiments obtained by those skilled in the art based on the embodiments of this utility model without inventive effort are within the scope of protection of this utility model.

Claims

1. A mother mold inclined ejector mechanism, comprising a front mold fixing plate (1), a front template (2) connected to the front mold fixing plate (1), and a rear template (3) connected to the front template (2), wherein the front template (2) is provided with a front mold core (21), and the rear template (3) is provided with a rear mold core (31), wherein the front mold core (21) and the rear mold core (31) are adjacent to each other, characterized in that: The front mold plate (2) is provided with a female mold sloping top (4). The front mold core (21), the rear mold core (31), and the female mold sloping top (4) together form the cavity (51) of the product (5). The female mold sloping top (4) includes a horizontal part (41) and an inclined part (42). The horizontal part (41) is located in the front mold plate (2), and the inclined part (42) extends into the front mold core (21). The front mold core (21) includes a first fixing part (211), a second fixing part (212), and a cavity (213). The second fixing part (212) is provided with a through hole (6) and a closed cavity (7). The front mold core (21) is provided with a clamping block (8). The clamping block (8) penetrates the cavity (213) and the second fixing part (212). The clamping block (8) includes a hanging platform (81) and a vertical part (82). The vertical part (82) extends into the through hole (6). In the mold closing state, the vertical part (82) contacts the rear mold core (31), and the horizontal part (41) contacts the hanging platform (81). A spring hole (9) is provided above the horizontal part (41). The spring hole (9) is located in the front template (2) and extends into the front mold fixing plate (1). A spring (91) is provided in the spring hole (9). The spring (91) acts on the horizontal part (41) of the female mold inclined top (4).

2. The inclined ejector mechanism for the female mold according to claim 1, characterized in that: The inclined portion (42) is provided with a barb groove (101) for forming a product barb (10).

3. The inclined ejector mechanism for the female mold according to claim 2, characterized in that: The length of the barb (10) is 0.5-1.0 mm.

4. The inclined ejector mechanism for the female mold according to claim 1, characterized in that: The inclined part (42) of the mother mold inclined top (4) forms an angle with the mold opening direction, and the angle is 5°-10°.

5. The inclined ejector mechanism for the female mold according to claim 1, characterized in that: The spring (91) is a compression spring, which is in a compressed state when the mold is closed.

6. The inclined ejector mechanism for the female mold according to claim 1, characterized in that: The height of the cavity (213) is 10-20mm.

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