Plastic mold slider internal spring pin structure

Abstract

The utility model provides a kind of plastic mould slider internal spring needle structure, comprising: front mould, rear mould and slider seat split internal formation mould cavity;Inclined guide pillar is fixed in front mould bottom, and extend towards the side away from mould cavity downwards;Inclined guide pillar is inserted along its oblique direction and is slidably connected in slider seat;Pin assembly is installed in slider seat, and pin assembly is slidably connected in slider seat along slider seat sliding direction;Slider control block is fixed in front mould;The side wall of slider control block close to pin assembly side, on one side vertical setting, on one side bending extension towards the side away from pin assembly;Pin assembly extends along its sliding direction both ends, one end is located at the product diameter position of mould cavity, and the other end is abutted on the vertical surface of slider control block;Spring is installed between slider control block and slider seat. The present application can complete the control to spring needle with single inclined plane, avoid the effect that product is adhered to slider.

Description

Technical Field

[0001] This utility model belongs to the field of injection mold technology, specifically, it relates to a spring pin structure inside a plastic mold slider. Background Technology

[0002] Molds are various shapes and tools used in industrial production to obtain desired products through methods such as injection molding, blow molding, extrusion, die casting, forging, smelting, and stamping. In short, a mold is a tool used to create shaped objects. This tool is composed of various parts, and different molds are composed of different parts. It mainly achieves the shaping of the object by changing the physical state of the material being molded. During the injection molding process, a thinner diameter section is formed at the slider position on the side edge of the product. With conventional slider structures, the slider structure near the product is prone to sticking when the mold opens, leading to a higher risk of breakage at the diameter section. Therefore, the internal spring pin structure of the plastic mold slider was developed.

[0003] Patent document CN106142459A discloses a slider-pin mechanism for a mold, including a plate A and a plate B. A front mold core is provided in the plate A, and a rear mold core is provided in the plate B. A slider is provided between the front and rear mold cores. A ramp surface is provided on one side of the slider. An inclined surface that mates with the ramp surface is provided on the plate A. A shovel is also provided on the plate A, and an inclined guide post that penetrates the slider is provided on the shovel. Wear-resistant blocks are provided on the ramp surface of the slider. A pin mechanism is provided inside the slider and arranged along the slider's movement direction. This utility model, by providing a pin mechanism on the slider, uses the shovel to hold the pin in place during mold opening, keeping the product a certain distance from the slider beforehand. When the mold opens to a certain distance, the pin disengages from the shovel.

[0004] However, the spring pin in patent document CN106142459A requires a specific shape at the tail to cooperate with the inclined surface to achieve control, as well as the cooperation between the two inclined surfaces. This places high demands on the assembly process and the machining accuracy of the inclined surfaces, and also makes subsequent maintenance more complicated.

[0005] To enable control of the spring pin using a single inclined plane and reduce the manufacturing requirements for the spring pin's structure and shape, this invention designs a spring pin structure inside a plastic mold slider, solving the aforementioned problems. Utility Model Content

[0006] In view of the deficiencies in the existing technology, the purpose of this utility model is to provide a spring pin structure inside the slider of a plastic mold.

[0007] According to the present invention, a spring pin structure for a plastic mold slider is provided, comprising: a mechanical spring pin structure, a front half mold, and a rear half mold; the mechanical spring pin structure includes a slider seat, an ejector pin assembly, an inclined guide post, a slider control block, and a spring; the front half mold is lifted and connected above the rear half mold; the slider seat is disposed between the front half mold and the rear half mold and is slidably connected to the upper surface of the rear half mold; the front half mold, the rear half mold, and the slider seat are assembled to form a mold cavity; The inclined guide post is fixed to the bottom of the front half mold and extends downward toward the side away from the mold cavity; the inclined guide post is inserted into and slidably connected to the slider seat along its inclined direction; the horizontal vector of the sliding direction of the slider seat is consistent with the horizontal vector of the inclined direction of the inclined guide post. The ejector pin assembly is mounted on the slider seat and is slidably connected to the slider seat along the sliding direction of the slider seat; the slider control block is fixed to the front half mold; the side wall of the slider control block near the ejector pin assembly is vertically set on the upper side and bent and extended towards the side away from the ejector pin assembly on the lower side. The ejector pin assembly extends at both ends along its sliding direction, with one end abutting against the product diameter located in the mold cavity and the other end abutting against the vertical surface of the slider control block; a spring is installed between the slider control block and the slider seat, and the spring drives the ejector pin assembly away from the mold cavity; The ejector pin assembly includes at least a first working state and a second working state; in the first state, the ejector pin assembly abuts against the vertical surface of the slider control block and abuts against the product diameter; in the second state, the ejector pin assembly abuts against the inclined surface of the slider control block and abuts away from the product diameter.

[0008] Preferably, the front mold includes a front mold panel, a front mold hot runner plate, and a front mold A plate arranged layer by layer from top to bottom; The rear mold includes, from top to bottom, the rear mold B plate, the upper ejector plate, the lower ejector plate, and the rear mold base plate, arranged in layers. The slider seat is located between the front mold plate A and the rear mold plate B, and is slidably connected to the upper surface of the rear mold plate B; the inclined guide post is fixed to the bottom of the front mold plate A; the slider control block is fixedly installed on the front mold plate A.

[0009] Preferably, the ejector pin assembly includes a slider ejector pin plate, a slider ejector pin base plate, a slider ejector pin, and a slider reset pin; The slider ejector plate and the slider ejector base plate are spliced ​​and fixedly connected; The slider ejector pin and slider reset pin are installed between the slider ejector plate and the slider ejector base plate. The slider ejector plate and the slider ejector base plate clamp and position the slider ejector pin and slider reset pin. The slider ejector plate and the slider ejector base plate are slidably connected to the slider seat along the slider seat direction; the slider reset pin extends toward the slider control block direction, passes through and is slidably connected to the slider seat, and the extended end of the slider reset pin abuts against the slider control block. The slider ejector pin extends toward the mold cavity side, passes through and slides to the slider seat, and the extended end of the slider ejector pin abuts against the product diameter position at the mold cavity.

[0010] Preferably, a shovel base is fixed to the bottom of the front mold A plate, and the shovel base abuts against the slider seat.

[0011] Preferably, an inclined guide post fixing block is sleeved on the outer side of the inclined guide post, and the inclined guide post fixing block is fixed to the front mold plate A.

[0012] Preferably, a front mold core is installed at the bottom of the front mold A plate; a rear mold core is installed at the top of the rear mold B plate; the front mold A plate and the rear mold B plate abut against each other, and the front mold core, the rear mold core and the slider seat are spliced ​​together to form a mold cavity inside.

[0013] Preferably, a rear mold support plate is provided between the rear mold B plate and the upper ejector plate, and the rear mold support plate is fixed to the rear mold B plate.

[0014] Preferably, the upper ejector plate and the lower ejector plate are fixedly connected, and a demolding ejector pin is clamped and positioned between the upper ejector plate and the lower ejector plate. The demolding ejector pin extends upward and passes through the upper ejector plate, the rear mold support plate, the rear mold B plate and the rear mold core. The demolding ejector pin is slidably connected to the rear mold support plate, the rear mold B plate and the rear mold core, and the top end of the demolding ejector pin is located at the bottom end of the mold cavity.

[0015] Preferably, a middle support guide post is installed and fixed above the rear mold base plate, and a middle support guide sleeve is installed and fixed on the upper ejector plate and the lower ejector plate. The middle support guide sleeve is sleeved and vertically connected to the middle support guide post, and the upper ejector plate and the lower ejector plate are vertically connected between the rear mold support plate and the rear mold base plate.

[0016] The upper ejector plate is equipped with an ejection mechanism, which drives the upper ejector plate and the lower ejector plate to rise and fall relative to the rear mold B plate. The demolding ejector pins rise and fall with the upper ejector plate and the lower ejector plate. Preferably, a front mold heat insulation plate is provided between the front half mold and the front mold fixed plate of the injection molding machine, and a rear mold heat insulation plate is provided between the rear half mold and the rear mold moving plate of the injection molding machine.

[0017] Compared with the prior art, the present invention has the following beneficial effects: 1. This application innovatively designs a small ejector plate structure inside the slider, which can combine multiple spring pins as needed.

[0018] 2. The small ejector plate structure of this application has sufficient space to place the spring, so as to facilitate the easy replacement and adjustment of the spring force in the future.

[0019] 3. The small ejector plate structure of this application has small guide pillars on the top, which makes the spring pins more reliable and less prone to jamming during the reciprocating motion of the slider mold opening action.

[0020] 4. Compared with the existing patents that make the tube surface on the mold frame, the insert of the slider control block of this application can be processed by a grinding machine, while the mold frame plate of the existing patent can only be processed by a milling machine. The method of separating the slider control block insert is easier to control the accuracy.

[0021] 5. The slider control block structure of this application is easier to replace if it wears out after long-term use, and it can use better heat-treated hard materials, resulting in better durability. Existing patents use heat-treated hard materials on a single mold base plate, which would increase costs significantly.

[0022] 6. In summary, compared with the existing patent structures, the new structure of this application is more cost-effective, the spring adjustment is more convenient, more reliable, and more durable. Attached Figure Description

[0023] Other features, objects, and advantages of this invention will become more apparent from the following detailed description of non-limiting embodiments with reference to the accompanying drawings: Figure 1 This is a schematic diagram of the overall structure of this utility model.

[0024] Figure 2 This is a cross-sectional view of the left slider ejecting the insert pin of this utility model.

[0025] Figure 3 This is a cross-sectional view of the right slider reset pin of this utility model.

[0026] Figure 4 This is a schematic diagram of the ejector pin assembly structure of this utility model.

[0027] The diagram shows: 1. Front mold panel; 2. Front mold hot runner plate; 3. Front mold A plate; 4. Rear mold B plate; 5. Rear mold support plate; 6. Upper ejector plate; 7. Lower ejector plate; 8. Rear mold base plate; 9. Front mold heat insulation plate; 10. Rear mold heat insulation plate; 11. Slider seat; 12. Slider ejector plate; 13. Slider ejector base plate; 14. Slider ejector insert; 15. Slider reset pin; 16. Shovel base; 17. Angled guide post; 18. Angled guide post fixing block; 19. Slider control block; 20. Spring. Detailed Implementation

[0028] The present invention will now be described in detail with reference to specific embodiments. These embodiments will help those skilled in the art to further understand the present invention, but do not limit the present invention in any way. It should be noted that those skilled in the art can make several changes and improvements without departing from the concept of the present invention. These all fall within the protection scope of the present invention.

[0029] like Figures 1-4As shown, a spring-loaded structure inside a plastic mold slider includes: a mechanical spring-loaded structure, a front mold half, and a rear mold half. The mechanical spring-loaded structure includes a slider seat 11, an ejector pin assembly, an inclined guide post 17, a slider control block 19, and a spring 20. The front mold half is vertically connected to the upper part of the rear mold half. The slider seat 11 is disposed between the front mold half and the rear mold half and is slidably connected to the upper surface of the rear mold half. The front mold half, the rear mold half, and the slider seat 11 are assembled to form a mold cavity.

[0030] The inclined guide post 17 is fixed to the bottom of the front half of the mold and extends downward toward the side away from the mold cavity. The inclined guide post 17 is inserted into and slidably connected to the slider seat 11 along its inclined direction. The horizontal vector of the sliding direction of the slider seat 11 is consistent with the horizontal vector of the inclined direction of the inclined guide post 17.

[0031] The ejector pin assembly is mounted on the slider seat 11 and is slidably connected to the slider seat 11 along the sliding direction of the slider seat 11. The slider control block 19 is fixed to the front half of the mold. The slider control block 19 is located on the side wall near the ejector pin assembly, with the upper side vertically positioned and the lower side bent and extended away from the ejector pin assembly.

[0032] The ejector pin assembly extends at both ends along its sliding direction, with one end abutting against the product diameter located in the mold cavity, and the other end abutting against the vertical surface of the slider control block 19. The spring 20 is installed between the slider control block 19 and the slider seat 11, and the spring 20 drives the ejector pin assembly away from the mold cavity.

[0033] The ejector pin assembly includes at least a first working state and a second working state; in the first state, the ejector pin assembly abuts against the vertical surface of the slider control block 19 and abuts against the product diameter; in the second state, the ejector pin assembly abuts against the inclined surface of the slider control block 19 and abuts away from the product diameter.

[0034] The working principle of this application is as follows: During the injection molding process, a thin product diameter will be generated at the slider position on the side edge of the product. In conventional slider structures, the slider structure is prone to sticking to the end near the product when the slider is ejected from the mold and the mold is opened, resulting in a high risk of the diameter sticking and breaking. Therefore, this utility model designs the slider seat 11 to slide away from the mold cavity by being guided by the inclined guide post 17 during the mold opening process. The ejector pin assembly is kept stationary by the abutment of the vertical surface of the slider control block 19. After the upper half of the mold separates to a certain extent, the ejector pin assembly is located at the inclined surface of the slider control block 19. Driven by the spring 20, the ejector pin assembly separates from the product diameter, so that the slider seat 11 and the product diameter are separated first under the limit of the ejector pin assembly. Then the ejector pin assembly separates again to avoid the product diameter sticking to the slider seat 11.

[0035] Specifically, the front mold half is fixed to the front mold plate of the injection molding machine using pressure plate screws, and the rear mold half is fixed to the rear mold moving plate of the injection molding machine using pressure plate screws. The injection molding machine closes the mold for injection molding. After injection molding, the rear mold half is pulled open by the injection molding machine, and the product is ejected from the mold. The front mold half includes, from top to bottom, a front mold panel 1, a front mold hot runner plate 2, and a front mold A plate 3, arranged layer by layer. The rear mold half includes, from top to bottom, a rear mold B plate 4, an upper ejector plate 6, a lower ejector plate 7, and a rear mold base plate 8, arranged layer by layer. A slider seat 11 is located between the front mold A plate 3 and the rear mold B plate 4, and is slidably connected to the upper surface of the rear mold B plate 4. Pressure strips are located on both sides of the slider seat 11, allowing it to slide stably even under vertical force. An inclined guide post 17 is fixed to the bottom of the front mold A plate 3. A slider control block 19 is fixedly installed on the front mold A plate 3.

[0036] The ejector assembly includes a slider ejector plate 12, a slider ejector base plate 13, a slider ejector pin 14, and a slider reset pin 15. The slider ejector plate 12 and the slider ejector base plate 13 are fixedly installed by bolts. The slider ejector pin 14 and the slider reset pin 15 are installed between the slider ejector plate 12 and the slider ejector base plate 13, which clamp and position the slider ejector pin 14 and the slider reset pin 15. The slider ejector plate 12 and the slider ejector base plate 13 extend with small guide posts that are slidably connected to the slider seat 11, thereby allowing the slider ejector plate 12 and the slider ejector base plate 13 to be slidably connected to the slider seat 11 along the direction of the slider seat 11. The slider reset pin 15 extends towards the slider control block 19, passes through and is slidably connected to the slider seat 11, and its extended end abuts against the slider control block 19. The slider ejector pin 14 extends toward the mold cavity side, passes through and slides to the slider seat 11, and the extended end of the slider ejector pin 14 abuts against the product diameter position at the mold cavity.

[0037] Preferably, the bottom of the front mold A plate 3 is provided with a shovel base 16 fixed by screws. When the front mold A plate 3 and the rear mold B plate 4 are closed, the shovel base 16 abuts against the slider seat 11, and the abutting surface of the shovel base 16 and the slider seat 11 is in the same direction of inclination as the inclined guide post 17. The shovel base 16 is used to press the slider seat 11 to prevent the plastic product size from becoming larger due to the high pressure of the injection molding machine forcing the slider to retreat during injection molding after mold closing, which would affect the product size and appearance. This ensures that the slider seat 11 maintains the correct position under the action of high pressure during injection molding.

[0038] Preferably, an inclined guide post fixing block 18 is sleeved on the outside of the inclined guide post 17. The inclined guide post fixing block 18 is fixed to the front mold A plate 3 by screws to reinforce the installation of the inclined guide post 17.

[0039] Specifically, the front mold panel 1, the front mold hot runner plate 2, and the front mold A plate 3 are fixed together with screws. The front mold panel 1 is fixedly clamped on the front mold plate of the injection molding machine to fix the front half of the mold. The middle of the front mold panel 1 is the injection entrance of the injection mold. The injection entrance is connected to the positioning nozzle injection system of the injection molding machine. The nozzle injection system is used to stably transport the molten rubber material of the injection molding machine to the mold cavity.

[0040] The front mold panel 1 injection inlet and the front mold hot runner plate 2 are equipped with a hot runner system. The hot runner system is used to heat the runner during the injection process, so that the plastic material in the runner is always kept in a molten state, avoiding the waste of plastic material due to cooling and solidification.

[0041] Specifically, the front mold core is installed at the bottom of the front mold plate A 3. The rear mold core is installed at the top of the rear mold plate B 4. The front mold plate A 3 and the rear mold plate B 4 abut against each other, so that the front mold core, the rear mold core and the slide block 11 are connected to each other to form a mold cavity. The mold cavity is connected to the upper injection inlet through a hot runner system. At least one mold cavity is provided between the front mold plate A 3 and the rear mold plate B 4.

[0042] In one embodiment, two mold cavities are provided between the front mold plate A 3 and the rear mold plate B 4.

[0043] Preferably, a rear mold support plate 5 is provided between the rear mold B plate 4 and the upper ejector plate 6. The rear mold support plate 5 is fixed to the rear mold B plate 4 to enhance the strength of the rear mold B plate 4 and enhance the stability of the rear mold insert during the downward pulling action.

[0044] The rear mold base plate 8 is fixed to the rear mold support plate 5 and is used to connect and fix the rear half mold, and is clamped on the rear mold moving plate.

[0045] The upper ejector plate 6 and the lower ejector plate 7 are fixedly connected. A demolding ejector pin is clamped and positioned between the upper ejector plate 6 and the lower ejector plate 7. The demolding ejector pin extends upward and passes through the upper ejector plate 6, the rear mold support plate 5, the rear mold B plate 4 and the rear mold core. The demolding ejector pin is slidably connected to the rear mold support plate 5, the rear mold B plate 4 and the rear mold core, and the top of the demolding ejector pin is located at the bottom of the mold cavity.

[0046] A center ejector guide post is installed and fixed above the rear mold base plate 8. A center ejector guide sleeve is installed and fixed on the upper ejector plate 6 and the lower ejector plate 7. The center ejector guide sleeve is fitted and flexibly connected to the center ejector guide post. The upper ejector plate 6 and the lower ejector plate 7 are flexibly connected between the rear mold support plate 5 and the rear mold base plate 8. The center ejector guide sleeve and the center ejector guide post provide guidance when the upper ejector plate 6 and the lower ejector plate 7 move up and down. An ejection mechanism is provided on the upper ejector plate 6. The ejection mechanism drives the upper ejector plate 6 and the lower ejector plate 7 to move up and down relative to the rear mold B plate 4. The demolding ejector pin moves up and down with the upper ejector plate 6 and the lower ejector plate 7, so that after the plastic mold is injection molded, the demolding ejector pin ejects the product out of the mold cavity.

[0047] Preferably, a front mold heat insulation plate 9 is provided between the front half mold and the front mold fixed plate of the injection molding machine, and a rear mold heat insulation plate 10 is provided between the rear half mold and the rear mold moving plate of the injection molding machine. The front mold heat insulation plate 9 and the rear mold heat insulation plate 10 are used to block heat transfer, ensure mold temperature stability, and protect the injection molding machine.

[0048] In the description of this application, it should be understood that the terms "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this application 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 application.

[0049] The specific embodiments of this utility model have been described above. It should be understood that this utility model is not limited to the specific embodiments described above, and those skilled in the art can make various changes or modifications within the scope of the claims, which do not affect the substantive content of this utility model. Unless otherwise specified, the embodiments and features described in this application can be arbitrarily combined with each other.

Claims

1. A spring pin structure inside a plastic mold slider, characterized in that, include: The mechanical spring pin structure includes a front mold and a rear mold; the mechanical spring pin structure includes a slider seat (11), an ejector pin assembly, an inclined guide post (17), a slider control block (19), and a spring (20); the front mold is lifted and connected above the rear mold; the slider seat (11) is located between the front mold and the rear mold and is slidably connected to the upper surface of the rear mold; the front mold, the rear mold, and the slider seat (11) are assembled to form a mold cavity; The inclined guide post (17) is fixed to the bottom of the front half mold and extends downward toward the side away from the mold cavity; the inclined guide post (17) is inserted into and slidably connected to the slider seat (11) along its inclined direction; the horizontal vector of the sliding direction of the slider seat (11) is consistent with the horizontal vector of the inclined direction of the inclined guide post (17); The ejector pin assembly is installed on the slider seat (11), and the ejector pin assembly is slidably connected to the slider seat (11) along the sliding direction of the slider seat (11); the slider control block (19) is fixed to the front half mold; the slider control block (19) is located on the side wall near the ejector pin assembly, with the upper side set vertically and the lower side bent and extended toward the side away from the ejector pin assembly. The ejector pin assembly extends at both ends along its sliding direction, with one end abutting against the product diameter located in the mold cavity and the other end abutting against the vertical surface of the slider control block (19); the spring (20) is installed between the slider control block (19) and the slider seat (11), and the spring (20) drives the ejector pin assembly away from the mold cavity; The ejector pin assembly includes at least a first working state and a second working state; in the first state, the ejector pin assembly abuts against the vertical surface of the slider control block (19) and abuts against the product diameter; in the second state, the ejector pin assembly abuts against the inclined surface of the slider control block (19) and abuts away from the product diameter.

2. The internal spring pin structure of the plastic mold slider according to claim 1, characterized in that, The front mold includes a front mold panel (1), a front mold hot runner plate (2), and a front mold A plate (3) arranged layer by layer from top to bottom; The rear half mold includes a rear mold B plate (4), an upper ejector plate (6), a lower ejector plate (7), and a rear mold base plate (8), which are arranged layer by layer from top to bottom. The slider seat (11) is located between the front mold A plate (3) and the rear mold B plate (4) and is slidably connected to the upper surface of the rear mold B plate (4); the inclined guide post (17) is fixed to the bottom of the front mold A plate (3); the slider control block (19) is fixedly installed on the front mold A plate (3).

3. The internal spring pin structure of the plastic mold slider according to claim 2, characterized in that, The ejector pin assembly includes a slider ejector pin plate (12), a slider ejector pin base plate (13), a slider ejector pin (14), and a slider reset pin (15). The slider ejector plate (12) and the slider ejector base plate (13) are spliced ​​and fixedly connected; The slider ejector pin (14) and slider reset pin (15) are installed between the slider ejector plate (12) and the slider ejector base plate (13). The slider ejector plate (12) and the slider ejector base plate (13) clamp and position the slider ejector pin (14) and slider reset pin (15). The slider ejector plate (12) and the slider ejector base plate (13) are slidably connected to the slider seat (11) along the direction of the slider seat (11); the slider reset pin (15) extends toward the slider control block (19), the slider reset pin (15) passes through and is slidably connected to the slider seat (11), and the extended end of the slider reset pin (15) abuts against the slider control block (19). The slider ejector pin (14) extends toward the mold cavity side, the slider ejector pin (14) passes through and slides to the slider seat (11), and the extended end of the slider ejector pin (14) abuts against the product diameter position at the mold cavity.

4. The internal spring pin structure of the plastic mold slider according to claim 2, characterized in that, The bottom of the front mold plate A (3) is fixed with a shovel base (16), which abuts against the slider seat (11).

5. The internal spring pin structure of the plastic mold slider according to claim 2, characterized in that, An inclined guide post fixing block (18) is sleeved on the outside of the inclined guide post (17), and the inclined guide post fixing block (18) is fixed to the front mold plate A (3).

6. The internal spring pin structure of the plastic mold slider according to claim 2, characterized in that, The front mold plate A (3) is equipped with a front mold core at the bottom; the rear mold plate B (4) is equipped with a rear mold core at the top; the front mold plate A (3) and the rear mold plate B (4) abut against each other, and the front mold core, the rear mold core and the slider seat (11) are spliced ​​together to form a mold cavity inside.

7. The internal spring pin structure of the plastic mold slider according to claim 6, characterized in that, A rear mold support plate (5) is provided between the rear mold B plate (4) and the upper ejector plate (6), and the rear mold support plate (5) is fixed to the rear mold B plate (4).

8. The internal spring pin structure of the plastic mold slider according to claim 7, characterized in that, The upper ejector plate (6) and the lower ejector plate (7) are fixedly connected. A demolding ejector pin is clamped and positioned between the upper ejector plate (6) and the lower ejector plate (7). The demolding ejector pin extends upward and passes through the upper ejector plate (6), the rear mold support plate (5), the rear mold B plate (4) and the rear mold core. The demolding ejector pin is slidably connected to the rear mold support plate (5), the rear mold B plate (4) and the rear mold core, and the top of the demolding ejector pin is located at the bottom of the mold cavity.

9. The internal spring pin structure of the plastic mold slider according to claim 8, characterized in that, A middle support guide post is installed and fixed above the rear mold base plate (8). A middle support guide sleeve is installed and fixed on the upper ejector plate (6) and the lower ejector plate (7). The middle support guide sleeve is sleeved and raised and lowered to the middle support guide post. The upper ejector plate (6) and the lower ejector plate (7) are raised and lowered to be connected between the rear mold support plate (5) and the rear mold base plate (8). The upper ejector plate (6) is provided with an ejection mechanism. The ejection mechanism drives the upper ejector plate (6) and the lower ejector plate (7) to rise and fall relative to the rear mold B plate (4). The demolding ejector pin rises and falls with the upper ejector plate (6) and the lower ejector plate (7).

10. The internal spring pin structure of the plastic mold slider according to claim 1, characterized in that, A front mold heat insulation plate (9) is provided between the front half mold and the front mold fixed plate of the injection molding machine, and a rear mold heat insulation plate (10) is provided between the rear half mold and the rear mold moving plate of the injection molding machine.

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