Injection mold convenient to demold based on cooperation of ejector pin shoveling machine and small sliding block
By using a coordinated design of ejector pins and small sliders, the problem of difficult demolding of products with internal mold clips was solved, achieving smooth demolding and ensuring mold strength, thus improving the efficiency of injection mold use.
Patent Information
- Application Number
- CN202610057215.X
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2026-01-16
- Publication Date
- 2026-02-17
AI Technical Summary
When processing products with a surrounding inner buckle, existing injection molds cannot accommodate multiple push plates to drive the demolding machine due to limited space inside the mold core, resulting in difficulties in demolding.
The design employs a combination of ejector pins and a small slider. Through the cooperation of limiting protrusions, solid lubricant, and compression chamber, the slider can smoothly slide and the product can be separated. Demolding is completed by the cooperation of the ejector pin and the small slider.
It enables smooth demolding of small products with internal clips, ensures the strength of the mold, and reduces friction through lubrication and airflow channels, thereby improving demolding efficiency.
Smart Images
Figure CN121535936A_ABST
Abstract
Description
Technical Field
[0001] This invention belongs to the field of injection mold technology, and in particular relates to an injection mold based on the coordinated action of an ejector pin and a small slider for easy demolding. Background Technology
[0002] Existing injection mold demolding solutions for this type of product generally adopt a structural design of "mold core + multiple sets of sliders + independent push plate": by setting sliders on the outer periphery of the mold core to match the number of internal clips, the sliders extend and cooperate with the mold core to form the internal clip cavity of the product; during demolding, the independent push plate inside the mold is used to drive the shovel to move, thereby pushing the sliders to retract inward and disengage from the internal clips, thereby achieving the purpose of removing the product; However, the inner buckle of some products is not set on one side, but around the perimeter. Therefore, multiple shovels are needed to form the inner buckle. However, the shovels need to be pushed by the push plate inside the mold to move. The space inside the mold core is small, so it is not possible to set multiple push plates to drive different shovels to move, which affects the use of the mold.
[0003] Therefore, it is necessary to invent an injection mold based on the coordinated action of an ejector pin and a small slider to facilitate demolding and solve the above problems. Summary of the Invention
[0004] To address the aforementioned problems, this invention provides an injection mold based on the coordinated action of an ejector pin and a small slider for easy demolding, thereby solving the problems mentioned in the background art.
[0005] To achieve the above objectives, the present invention provides the following technical solution: An injection mold based on the coordinated action of an ejector pin and a small slider for easy demolding includes a base, two injection stations are provided on the inner side of the base, and an injection device is provided in each injection station. The injection device includes a left mold, a right mold and an inner liner assembly. The left mold and the right mold are arranged symmetrically from left to right, and several semi-cylindrical grooves are symmetrically opened on the side facing each other. The semi-cylindrical grooves of the right mold and the left mold facing each other can be spliced to form a complete injection cavity. The inner liner assembly is located at the axis of the injection cavity. The injection molding assembly includes a mold core, a scraper, and a slider. The mold core is fixedly connected to the base. There are two scrapers, which are rod-shaped structures. The two scrapers are symmetrically and vertically slidably inserted into the bottom end of the mold core. The upper half of the two scrapers is designed with a slope on the opposite side, and the two slopes are inclined from bottom to top towards each other. Two strip-shaped limiting protrusions are fixedly connected to the slope of the scraper, and the limiting protrusions are parallel to the slope of the scraper. The side of the mold core is horizontally provided with a mounting hole at the position directly opposite the limiting protrusion. The slider is slidably inserted into the mounting hole, and the side of the slider closer to the scraper is slidably mounted on the limiting protrusion.
[0006] Furthermore, the two limiting protrusions are located in the same vertical plane, and the side of each protrusion away from the shovel is parallel to the inclined surface of the shovel. The limiting protrusions have a notch near the bottom, and the slider can slide and engage with the side of the notch. A lubrication mechanism is provided at the notch.
[0007] Furthermore, the lubrication mechanism includes a solid lubricant and a retaining spring. The solid lubricant is slidably inserted into the side of the shovel, and the top of the solid lubricant is inclined from top to bottom away from the notch. The retaining spring is fixedly connected between the solid lubricant and the inside of the shovel, and the retaining spring and the solid lubricant can be detached. The bottom end of the slider is provided with a beveled pressure hole at the position directly opposite the solid lubricant, and the beveled pressure hole of the slider is parallel to the bevel of the solid lubricant.
[0008] Furthermore, a vertical compression chamber is provided at the center of the mold core. A piston matching the inner diameter of the compression chamber is slidably installed in the vertical direction inside the compression chamber. Vertical strip holes are provided on both sides of the compression chamber, directly opposite the two excavators. The excavators can always fit against the strip holes to seal them. Connecting blocks are symmetrically fixedly connected to both sides of the piston. The two connecting blocks are slidably installed in the two strip holes respectively. The side of the connecting block away from the piston is fixedly connected to the excavator directly opposite. Several air jet holes are evenly provided on the side wall of the compression chamber. The air jet holes are always located in the bottom area of the piston.
[0009] Furthermore, the top of the shovel is provided with a top block of the same size as the top. A rod is vertically fixedly connected to the bottom center of the top block. A vertical insertion hole is opened at the top center of the shovel. The rod is vertically slidably inserted into the insertion hole. A return spring is fixedly connected between the bottom end of the rod and the bottom inner wall of the insertion hole. Vertical first tooth grooves are symmetrically opened on both sides of the rod. Teeth are evenly distributed from top to bottom in the first tooth grooves. Gears are rotatably installed on the inner walls of both sides of the insertion hole at positions directly opposite to the two first tooth grooves. The gears can always mesh with the teeth in the first tooth grooves. A vertical second tooth groove is opened at the position directly opposite the first tooth grooves. A section of teeth is also distributed on the upper part of the second tooth groove. The teeth in the second tooth groove can mesh with the gears.
[0010] Furthermore, the top of the shovel is provided with a storage groove coaxial with it, and a support ring coaxial with it is slidably installed in the storage groove along the vertical direction. A buffer spring is fixedly connected between the bottom of the support ring and the inner wall of the bottom of the storage groove.
[0011] Furthermore, in the initial state, the teeth in the second tooth groove are located at the top of the gear and separated from it, while at this time the end of the slider away from the limiting protrusion can extend out of the surface of the shovel.
[0012] Furthermore, the support ring is made of wear-resistant rubber, and in the initial state, the top block can press the support ring downward under the action of the return spring on the insertion rod and fit it together with the top of the shovel.
[0013] Furthermore, a movable block is slidably inserted at the end of the slider away from the strip protrusion, and a support spring is fixedly connected between the movable block and the inside of the slider, and the end of the movable block away from the support spring can always be located outside the slider under the action of the support spring.
[0014] Furthermore, the surfaces of the top block and the shovel are provided with several vertical airflow grooves, and the airflow grooves on the surfaces of the top block and the shovel are interconnected.
[0015] The technical effects and advantages of this invention are as follows: 1. This invention solves the problem of insufficient space in the mold core when small products have internal buckles by using the cooperation of the shovel and the slider. With this solution, the mold core can also be processed to carry water, ensuring the strength of the mold. 2. By incorporating a solid lubricant, during the movement of the shovel, when the slider slides to a position directly opposite the solid lubricant, the solid lubricant lubricates the side of the slider that contacts the limiting protrusion, thereby enabling the slider to slide more smoothly along the limiting protrusion. 3. The present invention has a compression chamber. After injection molding is completed, as the shovel moves downward, the slider can gradually enter the inner side of the mold core under the pull of the limiting protrusion. During this process, the piston can move downward under the drive of the shovel and squeeze the air in the compression chamber, so that the air in the compression chamber can enter the gap between the mold core and the product, thereby helping the product to separate from the mold core. Attached Figure Description
[0016] Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 This is a three-dimensional schematic diagram of the structure of the mold core, slider, and shovel in this invention; Figure 3 This is a three-dimensional sectional view of the mold core in this invention; Figure 4 In this invention Figure 3 Enlarged view of part A; Figure 5 This is a three-dimensional schematic diagram of the structure of the mold core, slider, and support ring in this invention; Figure 6 This is a three-dimensional schematic diagram of the structure of the shovel, slider, and solid lubricant in this invention; Figure 7 This is a three-dimensional schematic diagram of the shovel in this invention.
[0017] In the diagram: 1. Base; 2. Left mold; 3. Right mold; 4. Mold core; 5. Shovel; 6. Slider; 7. Limiting protrusion; 8. Solid lubricant; 9. Clamping spring; 10. Angled pressure port; 11. Compression chamber; 12. Piston; 13. Connecting block; 14. Air jet hole; 15. Top block; 16. Insert rod; 17. Return spring; 18. First tooth groove; 19. Gear; 20. Second tooth groove; 21. Support ring; 22. Buffer spring; 23. Airflow groove. Detailed Implementation
[0018] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the present invention will be clearly and completely described below in conjunction with the embodiments.
[0019] This invention provides, for example Figures 1 to 7 The injection mold shown is based on the coordinated action of an ejector pin and a small slider 6 for easy demolding. It includes a base 1, with two injection stations arranged inside the base 1. An injection device is arranged in each injection station, and the injection device includes a left mold 2, a right mold 3 and an inner liner assembly. The left mold 2 and the right mold 3 are arranged symmetrically from left to right, and several semi-cylindrical grooves are symmetrically opened on the side facing each other. The semi-cylindrical grooves of the right mold 3 and the left mold 2 can be spliced together to form a complete injection cavity. The inner liner assembly is located at the axis of the injection cavity. The injection molding assembly includes a mold core 4, a scraper 5, and a slider 6. The mold core 4 is fixedly connected to the base 1. There are two scrapers 5, and the scrapers 5 are rod-shaped structures. The two scrapers 5 are symmetrically and vertically slidably inserted into the bottom end of the mold core 4. The upper half of the two scrapers 5 is designed with a slope on the side that is away from each other. The two slopes are inclined from bottom to top towards each other. Two strip-shaped limiting protrusions 7 are fixedly connected to the slope of the scraper 5. The limiting protrusions 7 are parallel to the slope of the scraper 5. The side of the mold core 4 is horizontally provided with a mounting hole at the position directly opposite the limiting protrusions 7. The slider 6 is slidably inserted into the mounting hole, and the side of the slider 6 closest to the scraper 5 is slidably mounted on the limiting protrusions 7. Before injection molding, the left mold 2 and the right mold 3 can move towards each other and merge together, so that the mold core 4 is surrounded at its axis by the semi-cylindrical grooves on the left mold 2 and the right mold 3. At the same time, the shovel 5 is at its highest point, and the free end of the slider 6 can extend out of the outside of the mold core 4 under the pushing action of the limiting protrusion 7. During injection molding, as the raw material is injected into the gap between the semi-cylindrical groove and the outer side of the mold core 4, the raw material can be injection molded into the product shape under the cooperation of the semi-cylindrical groove and the mold core 4. The position of the slider 6 can leave an inner buckle hole on the inner wall of the product. After injection molding is completed, as the left mold 2 and the right mold 3 move away from each other, the outer side of the product is no longer clamped by the left mold 2 and the right mold 3. At this time, as the shovel 5 moves downward, the slider 6 can move towards the inner side of the mold core 4 under the pull of the limiting protrusion 7, thereby realizing the separation of the slider 6 from the product. Thus, while completing the pre-reserved inner buckle hole on the inner side of the product, it is convenient to separate the molded product from the mold core 4. This invention solves the problem of small products with inner buckles and insufficient space in the mold core 4 through this solution. With this solution, the mold core 4 can also be processed with water channels to ensure the strength of the mold.
[0020] like Figure 6 As shown, the two limiting protrusions 7 are located in the same vertical plane, and the side of both away from the shovel 5 is parallel to the inclined surface of the shovel 5. The limiting protrusions 7 have a notch near the bottom, and the slider 6 can slide and engage with the side of the notch. A lubrication mechanism is provided at the notch. The lubrication mechanism includes a solid lubricant 8 and a retaining spring 9. The solid lubricant 8 is slidably inserted into the side of the shovel 5, and the top of the solid lubricant 8 is inclined from top to bottom away from the notch. The retaining spring 9 is fixedly connected between the solid lubricant 8 and the inside of the shovel 5, and the retaining spring 9 and the solid lubricant 8 can be disassembled. The bottom of the slider 6 is provided with a beveled pressure port 10 opposite to the solid lubricant 8, and the beveled pressure port 10 of the slider 6 is parallel to the bevel of the solid lubricant 8. By incorporating a solid lubricant 8, during the movement of the excavator 5, when the slider 6 moves along the limiting protrusion 7 to contact the solid lubricant 8, the slider 6 can squeeze the solid lubricant 8 through its inclined pressure port 10. This allows the solid lubricant 8 to move into the excavator 5 under the squeezing action of the slider 6 and compress the clamping spring 9. The reaction force of the clamping spring 9 on the solid lubricant 8 keeps the solid lubricant 8 and the slider 6 in close contact. Thus, when the slider 6 slides to a position directly opposite the solid lubricant 8, the solid lubricant 8 can lubricate the side of the slider 6 that contacts the limiting protrusion 7, thereby allowing the slider 6 to slide more smoothly along the limiting protrusion 7.
[0021] like Figures 2 to 5As shown, a vertical compression chamber 11 is provided at the center of the mold core 4. A piston 12 matching the inner diameter of the compression chamber 11 is slidably installed in the compression chamber 11 along the vertical direction. Vertical strip holes are provided on both sides of the compression chamber 11 at positions directly opposite to the two excavators 5. The excavators 5 can always fit together with the strip holes to seal them. Connecting blocks 13 are symmetrically fixedly connected to both sides of the piston 12. The two connecting blocks 13 are slidably installed in the two strip holes respectively. The side of the connecting block 13 away from the piston 12 is fixedly connected to the excavator 5 directly opposite. Several air jet holes 14 are evenly provided on the side wall of the compression chamber 11. The air jet holes 14 are always located in the bottom area of the piston 12. With the compression chamber 11 provided, after injection molding is completed, as the shovel 5 moves downward, the slider 6 can gradually enter the inner side of the mold core 4 under the pull of the limiting protrusion 7. During this process, the piston 12 can move downward under the drive of the shovel 5 and squeeze the air in the compression chamber 11, so that the air in the compression chamber 11 can enter the gap between the mold core 4 and the product, thereby helping the product to separate from the mold core 4.
[0022] like Figures 2 to 7 As shown, the top of the shovel 5 is provided with a top block 15 of the same size as its top. A rod 16 is vertically fixedly connected to the center of the bottom of the top block 15. A vertical insertion hole is opened at the center of the top of the shovel 5. The rod 16 is vertically slidably inserted into the insertion hole. A return spring 17 is fixedly connected between the bottom end of the rod 16 and the inner wall of the bottom of the insertion hole. Vertical first toothed grooves 18 are symmetrically opened on both sides of the rod 16. Teeth are evenly distributed from top to bottom in the first toothed grooves 18. The inner walls of both sides of the insertion hole are perpendicular to the two first toothed grooves 18. Gears 19 are rotatably installed at the correct positions, and gears 19 can always mesh with the teeth in the first tooth groove 18. The shovel 5 has a vertical second tooth groove 20 at the position directly opposite the first tooth, and a section of teeth is also distributed on the upper part of the second tooth groove 20. The teeth in the second tooth groove 20 can mesh with gears 19. In the initial state, the teeth in the second tooth groove 20 are located at the top of gears 19 and separated from them. At this time, the end of the slider 6 away from the limiting protrusion 7 can extend out of the surface of the shovel 5. With the top block 15 in place, after injection molding is complete, as the shovel 5 moves downward, the teeth in the second toothed groove 20 on the shovel 5 gradually approach the gear 19 from top to bottom. At the same time, the slider 6 also gradually moves towards the inside of the mold core 4 under the pull of the limiting protrusion 7. When the teeth in the second toothed groove 20 mesh with the gear 19, the slider 6 is completely retracted into the mold core 4. At this time, as the shovel 5 continues to move downward, the teeth in the second toothed groove 20 can drive the gear 19 to rotate. As the gear 19 rotates, the teeth in the first toothed groove 18 of the insert rod 16 can drive the insert rod 16 and the top block 15 to move upward under the action of the gear 19. As the top block 15 moves upward, it can push the product fitted on the mold core 4 upward, thereby helping the product to separate better from the mold core 4.
[0023] like Figure 4 and Figure 5 As shown, the top of the shovel 5 is provided with a storage groove coaxial with it. A support ring 21 coaxial with it is slidably installed in the storage groove along the vertical direction. A buffer spring 22 is fixedly connected between the bottom of the support ring 21 and the inner wall of the bottom of the storage groove. The support ring 21 is made of wear-resistant rubber. In the initial state, the top block 15 can press the support ring 21 downward under the action of the return spring 17 pulling the plug rod 16 and stick it together with the top of the shovel 5. With the buffer spring 22 in place, during the upward reset of the shovel 5, as the teeth in the second tooth groove 20 separate from the gear 19, the teeth in the second tooth groove 20 no longer obstruct or restrict the gear 19. At this time, the top block 15 can move downward quickly under the pulling force of the reset spring 17 on the insert rod 16. When the top block 15 contacts the support ring 21, as the top block 15 presses down on the support ring 21, the support ring 21 can move downward and compress the buffer spring 22. This converts the kinetic energy of the top block 15 when it moves downward into the elastic potential energy of the buffer spring 22, thereby reducing the impact force of the top block 15 on the top of the shovel 5 when it falls, and protecting the shovel 5.
[0024] like Figure 2 and Figure 5 As shown, the surfaces of the top block 15 and the shovel 5 are provided with several vertical airflow grooves 25, and the airflow grooves 25 on the surfaces of the top block 15 and the shovel 5 are interconnected. By providing airflow channels 25, during demolding, as the piston 12 forces the air in the compression chamber 11 into the gap between the inside of the product and the mold core 4, and as the ejector block 15 pushes the product upward, both the outside air and the air in the compression chamber 11 can enter the inner area of the product well, thereby reducing the negative pressure inside the product after injection molding, making it easier for the product to separate from the mold core 4.
[0025] The above embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit it.
Claims
1. An injection mold based on the cooperation of a ejector pin and a small slider to facilitate demolding, comprising a base (1), characterized in that: The base (1) is provided with two injection molding stations, which are provided with injection molding devices, the injection molding device comprises a left mold (2), a right mold (3) and an inner lining assembly; the left mold (2) and the right mold (3) are symmetrically arranged, and a plurality of semicylindrical grooves are symmetrically formed on the opposite sides of the left mold (2) and the right mold (3); the semicylindrical grooves on the opposite sides of the right mold (3) and the left mold (2) can be connected to form a complete injection molding cavity, and the inner lining assembly is located at the axis of the injection molding cavity; the injection molding assembly comprises a mold core (4), a shovel (5) and a sliding block (6), the mold core (4) is fixedly connected to the base (1), the number of the shovel (5) is two, and the shovel (5) is in the form of a rod; the two shovels (5) are symmetrically and vertically inserted into the bottom end of the mold core (4); the upper half of the two shovels (5) is designed as an inclined surface, and the two inclined surfaces are inclined towards each other from bottom to top; the inclined surface of the shovel (5) is fixedly connected with two strip-shaped limiting protrusions (7), and the limiting protrusions (7) are parallel to the inclined surface of the shovel (5); the side surface of the mold core (4) is provided with a mounting hole opposite to the limiting protrusions (7), and the sliding block (6) is slidingly inserted into the mounting hole and is fixedly connected with the limiting protrusions (7) on the side close to the shovel (5).
2. The injection mold based on the cooperation of ejector pin and small slider to facilitate demolding, according to claim 1, characterized in that: The two limiting protrusions (7) are located in the same vertical plane, and the sides away from the shovel (5) are parallel to the inclined surface of the shovel (5); the limiting protrusions (7) are provided with a notch close to the bottom end, and the sliding block (6) can be slidingly connected with the side surface of the notch; and the notch is provided with a lubricating mechanism.
3. The injection mold based on the cooperation of ejector pin and small slider to facilitate demolding, according to claim 2, characterized in that: The lubricating mechanism comprises a solid lubricant (8) and a pressing spring (9), the solid lubricant (8) is slidingly inserted into the side surface of the shovel (5), and the top end of the solid lubricant (8) is inclined away from the notch from top to bottom; the pressing spring (9) is fixedly connected between the solid lubricant (8) and the inside of the shovel (5), and the pressing spring (9) and the solid lubricant (8) can be detached; the bottom end of the sliding block (6) is provided with an inclined pressing opening (10) opposite to the solid lubricant (8), and the inclined pressing opening (10) of the sliding block (6) is parallel to the inclined surface of the solid lubricant (8).
4. The injection mold based on the cooperation of ejector pin and small slider to facilitate demolding, according to claim 3, characterized in that: The mold core (4) is provided with a vertical compression cavity (11) at the axis, the compression cavity (11) is slidingly installed with a piston (12) matched with the inner diameter of the compression cavity (11) in the vertical direction, the compression cavity (11) is provided with vertical strip-shaped holes opposite to the two shovels (5) on both sides, and the shovels (5) can always be attached to the strip-shaped holes to close them; the piston (12) is symmetrically fixedly connected with a connecting block (13) on both sides, the two connecting blocks (13) are slidingly installed in the two strip-shaped holes respectively, and the side away from the piston (12) of the connecting block (13) is fixedly connected with the opposite shovel (5); a plurality of jet holes (14) are uniformly formed on the side wall of the compression cavity (11), and the jet holes (14) are always located in the bottom region of the piston (12).
5. The injection mold based on the cooperation of ejector pin and small slider to facilitate demolding, according to claim 4, characterized in that: The top of the shovel (5) is provided with a top block (15) with the same size as the top of the shovel (5), the bottom center of the top block (15) is vertically and fixedly connected with a inserting rod (16), the top center of the shovel (5) is provided with a vertical inserting hole, the inserting rod (16) is vertically and slidingly inserted into the inserting hole, the bottom end of the inserting rod (16) and the inner wall of the bottom of the inserting hole are fixedly connected with a return spring (17), the two sides of the inserting rod (16) are symmetrically provided with vertical first tooth grooves (18), the first tooth grooves (18) are uniformly and downwardly distributed with teeth, the inner walls of the two sides of the inserting hole and the two first tooth grooves (18) are opposite and are rotatably provided with gear wheels (19), and the gear wheels (19) can always be engaged with the teeth in the first tooth grooves (18), the shovel (5) is provided with a vertical second tooth groove (20) at the position opposite to the first tooth, and the second tooth groove (20) is also distributed with a section of teeth at the upper portion, and the teeth in the second tooth groove (20) can be engaged with the gear wheels (19).
6. The injection mold based on the cooperation of ejector pin and small slider to facilitate demolding, according to claim 5, characterized in that: The top of the shovel (5) is provided with a receiving groove coaxial with the shovel (5), the receiving groove is vertically and slidingly provided with a support ring (21) coaxial with the receiving groove, and the bottom of the support ring (21) and the inner wall of the bottom of the receiving groove are fixedly connected with a buffer spring (22).
7. The injection mold based on the cooperation of ejector pin and small slider to facilitate demolding, according to claim 6, characterized in that: In the initial state, the teeth in the second tooth groove (20) are located at the top of the gear wheel (19) and separated from the gear wheel (19), and at this time, the end of the sliding block (6) away from the limiting protrusion (7) can extend out of the surface of the shovel (5).
8. The injection mold based on the cooperation of ejector pin and small slider to facilitate demolding, according to claim 7, characterized in that: The support ring (21) is made of wear-resistant rubber material, and in the initial state, the top block (15) can press the support ring (21) downward and be attached to the top of the shovel (5) under the action of the pulling force of the return spring (17) on the inserting rod (16).
9. The injection mold based on the cooperation of ejector pin and small slider to facilitate demolding, according to claim 8, characterized in that: The surfaces of the top block (15) and the shovel (5) are provided with a plurality of vertical air flow grooves (25), and the air flow grooves (25) on the surfaces of the top block (15) and the shovel (5) are communicated with each other.