Front mold slide structure
By designing the front mold sliding structure and utilizing the cooperation of the sprue plate, front template, and shovel base, the problem of difficult core pulling on the inner sidewall of multiple undercut structures was solved, enabling smooth demolding of the product and core pulling operation of multiple undercuts.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- SHENZHEN EVA MOULD MFG CO LTD
- Filing Date
- 2025-04-23
- Publication Date
- 2026-05-05
AI Technical Summary
In injection molding, when multiple undercut structures on the product are located on the inner sidewall of the hole, the existing sliding structure and inclined ejector structure are difficult to achieve effective core pulling, causing the product to stick to the mold core and unable to be demolded smoothly.
Design a front mold sliding structure, including a sprue plate, a front template, a spade base, a slider, and a limiting mechanism. Through the coordinated movement of the spade base and the slider, multiple undercut core pulling and anti-reset can be achieved, preventing the product from sticking to the mold core.
It achieves effective core pulling of multiple undercut structures, avoids the product sticking to the mold core, occupies little space, and can complete the core pulling operation of multiple parts at one time.
Smart Images
Figure CN224197233U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of injection molds, and more specifically, to a front mold sliding structure. Background Technology
[0002] Molds are indispensable tools in injection molding. Injection molding involves injecting molten plastic material at high speed into a closed cavity of the desired shape. After the plastic material cools and solidifies, the mold is opened to eject the solidified plastic product, thus obtaining the molded product. Because injection molding has advantages such as low molding cost, short molding cycle, simple molding process, and ease of molding complex shapes, it is widely used in the plastics industry. Three-plate molds, also known as narrow-gate molds, are often used in situations where gate marks are not allowed around the product. They produce products with small gate marks and an aesthetically pleasing appearance, and are widely used in injection molding.
[0003] When molding a product, if the product is located on the undercut structure of the front mold, it will stick to the mold core of the front mold, making it impossible to demold. Therefore, the mold will use a sliding structure or a slanted ejector structure to pull the core to prevent the product from sticking to the mold core of the front mold. However, when there are multiple undercut structures on the product, and the undercut structure is located on the inner wall of a hole on the product, the stroke of the sliding structure is limited by the diameter of the hole. Due to the small space, the core pulling position of the sliding structure is limited, which makes it impossible for general sliding structures and slanted ejector structures to achieve core pulling. Utility Model Content
[0004] To address the aforementioned shortcomings of existing technologies, a front mold sliding structure is provided.
[0005] The technical solution adopted by this utility model to solve its technical problem is: a front mold sliding structure, including a sprue plate and a front mold plate arranged in sequence. A shovel base that slides up and down is embedded on the top surface of the front mold plate. A limiting mechanism that restricts the stroke of the shovel base is provided on the front mold plate. A rubber plug is provided on the top surface of the shovel base. A rubber plug hole that cooperates with the rubber plug to pull the shovel base is provided on the sprue plate. A front mold core is provided directly below the shovel base. A plurality of sliders that slide radially along the front mold core are embedded on the front mold core. A slot is provided on the top surface of the front mold core. A shovel base that matches and is inserted into the slot is provided at the bottom end of the shovel base. A plurality of shovel base grooves that drive the corresponding sliders to slide are provided on the side wall of the shovel base away from the shovel base. A limiting block that restricts the up and down sliding of the slider is provided between the front mold core and the shovel base. An anti-reset mechanism that prevents the shovel base from moving down and resetting after the mold is opened is provided on the front mold core.
[0006] Preferably, the shovel base includes a connecting part and a transmission part, which are integrally formed. The connecting part is connected to the shovel base seat, and the transmission part has a regular hexagonal frustum structure. The lower bottom surface of the transmission part is connected to one end of the connecting part, and the upper bottom surface of the transmission part is provided with a countersunk through hole penetrating the connecting part. Three shovel base grooves are provided, and the three shovel base grooves are circumferentially and equally spaced on the side wall of the transmission part.
[0007] Preferably, the shovel base groove has a T-shaped structure, and the axis of the shovel base groove is inclined from the side away from the center of the transmission part at the top to the side closer to the center of the transmission part at the bottom. The slider is provided with a transmission block that matches and slides in the shovel base groove.
[0008] Preferably, an ejector spring is provided between the bottom of the slot of the front mold core and the bottom of the shovel base.
[0009] Preferably, the anti-reset mechanism includes multiple positioning beads, which are disposed on the limiting block at a position directly above the corresponding slider. Each slider has two positioning grooves on its top surface that cooperate with the corresponding positioning beads, and the two positioning grooves are located on opposite sides of the top surface of the slider in the slider sliding direction.
[0010] Preferably, the top surface of the front mold core is provided with a plurality of positioning blocks, and the limiting block is provided with a plurality of limiting grooves for the positioning blocks to be matched and inserted.
[0011] Preferably, the limiting block has a circular ring structure, and the top and bottom surfaces of the limiting block abut against the shovel base and the front mold core respectively. The limiting block is fixedly connected to the front mold core, and the shovel base passes through the center of the limiting block and is inserted into the slot.
[0012] Preferably, the limiting mechanism includes a stop block, and a limiting notch extending vertically is provided at the edge of the top surface of the shovel base. The stop block is embedded in the front template, and one end of the stop block extends into the limiting notch.
[0013] Preferably, the front mold core is provided with a plurality of mold core notches extending radially along the front mold core, the top of the mold core notch and both ends extending radially along the front mold core are open, and the slider is slidably disposed in the corresponding mold core notch.
[0014] The beneficial effects of this utility model are as follows: When the mold is opened, the sprue plate pulls out the runner solidified material and drives the shovel base to move upward through the plug hole and the plug. At this time, the shovel base moves upward relative to the front mold core. The shovel base, through the shovel base groove and the limiting block, makes multiple sliders slide towards the center of the shovel base, thereby allowing the sliders to pull out the undercut on the product. After the sliders have pulled out the undercut, the limiting mechanism restricts the shovel base from moving upward, allowing the shovel base to separate from the sprue plate, avoiding affecting the removal of the runner solidified material from the sprue plate. The anti-reset mechanism prevents the sliders from re-inserting into the undercut of the product, thereby preventing the product from sticking to the front mold core when the front mold plate and the rear mold plate are separated. This structure occupies little space and can complete the core pulling and resetting of multiple parts at one time. At the same time, it can complete the core pulling of the undercut structure on the inner wall of the hole. Attached Figure Description
[0015] Figure 1 This is a cross-sectional structural diagram of the present invention with the sprue plate and front template removed;
[0016] Figure 2 This is a schematic diagram of the overall structure of an embodiment of the present utility model;
[0017] Figure 3 This is an embodiment of the present utility model. Figure 2 Enlarged view of region A in the middle;
[0018] Figure 4 This is a schematic diagram of the structure of this utility model, which removes the sprue plate and the front template.
[0019] Figure 5 This is a schematic diagram of the structure of the limiting block and the front mold core in an embodiment of this utility model;
[0020] Figure 6 This is a schematic diagram of the slider structure according to an embodiment of the present invention;
[0021] Figure 7 This is a schematic diagram of the shovel base according to an embodiment of the present invention.
[0022] Reference numerals: 1. Sprue plate, 10. Plug hole, 11. Front template, 2. Shovel base, 20. Limiting notch, 21. Plug, 3. Front mold core, 30. Slot, 31. Mold core notch, 32. Positioning block, 4. Slider, 40. Transmission block, 5. Shovel base, 50. Connecting part, 51. Transmission part, 52. Shovel base groove, 53. Countersunk through hole, 6. Limiting block, 60. Limiting groove, 7. Ejection spring, 8. Positioning bead, 80. Positioning groove, 9. Stop block. Detailed Implementation
[0023] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below. Obviously, the described embodiments are some embodiments of this utility model, but not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model. In addition, the directional terms mentioned in this utility model, such as "up," "down," "front," "back," "left," "right," "inner," and "outer," are only for reference to the directions in the accompanying drawings. The directional terms are used to better and more clearly explain and understand this utility model, and are not intended to indicate or imply the necessary orientation of this utility model. Therefore, they should not be construed as limitations on this utility model.
[0024] Examples of embodiments of this utility model Figures 1 to 7 As shown, a front mold sliding structure includes a sprue plate 1 and a front mold plate 11 arranged sequentially. A sliding shovel base 2 is embedded on the top surface of the front mold plate 11. A limiting mechanism restricting the stroke of the shovel base 2 is provided on the front mold plate 11. Preferably, a shovel base flow channel is also provided on the top surface of the shovel base 2, connecting the main flow channel on the front mold plate 11 and the glue inlet on the front mold plate 11. A glue plug 21 is provided on the top surface of the shovel base 2. A glue plug hole 10, which cooperates with the glue plug 21 to pull the shovel base 2, is provided on the sprue plate 1. A front mold core 3 is provided directly below the shovel base 2. The glue plug 21 is screwed onto the top surface of the shovel base 2, and the pulling force of the glue plug hole 10 pulling the glue plug 21 is adjusted by turning the screw. Multiple sliders 4 that slide radially along the front mold core 3 are embedded on the front mold core 3. Multiple mold rods extending radially along the front mold core 3 are provided on the front mold core 3. The notch 31 has an opening at its top and at both ends extending radially along the front mold core 3. That is, the end of the notch 31 near the center of the front mold core 3 and the end away from the center of the front mold core 3 are both open structures. The slider 4 is slidably disposed in the corresponding notch 31. The top surface of the front mold core 3 is provided with a slot 30. The bottom end of the shovel base 2 is provided with a shovel base 5 that matches the slot 30. The side wall of the shovel base 5 away from the shovel base 2 is provided with a plurality of shovel base grooves 52 that drive the corresponding slider 4 to slide. That is, the plurality of shovel base grooves 52 are located on the lower side of the side wall of the shovel base 5. A limiting block 6 is provided between the front mold core 3 and the shovel base 2 to restrict the slider 4 from sliding up and down, so that the shovel base 5 will not move the slider 4 up and down, allowing the slider 4 to slide only along the radial direction of the front mold core 3. The front mold core 3 is provided with an anti-reset mechanism to prevent the shovel base 5 from moving down and resetting after the mold is opened.
[0025] During mold opening, the sprue plate 1 pulls out the runner solidified material while simultaneously driving the shovel base 2 upward through the plug hole 10 and plug 21. At this time, the shovel base 5 moves upward relative to the front mold core 3. The shovel base 5, through the shovel base groove 52 and the limiting block 6, causes multiple sliders 4 to slide towards the center of the shovel base 5, thereby allowing the sliders 4 to pull out the undercut on the product. After the sliders 4 have pulled out the undercut, the limiting mechanism restricts the shovel base 2 from moving upward, allowing the shovel base 2 to separate from the sprue plate 1, avoiding affecting the removal of the runner solidified material from the sprue plate 1. The anti-reset mechanism prevents the sliders 4 from re-inserting into the undercut of the product, thereby preventing the product from sticking to the front mold core 3 when the front mold plate 11 and the rear mold plate are separated. This structure occupies little space and can complete the core pulling of multiple parts at once, and can also complete the core pulling of the undercut structure on the inner wall of the hole.
[0026] Further improvements, such as Figure 1 and Figure 7 As shown, the shovel base 5 includes a connecting part 50 and a transmission part 51, which are integrally formed. The connecting part 50 is connected to the shovel base 2. The transmission part 51 has a regular hexagonal frustum structure. The slot 30 of the front mold core 3 also has a regular hexagonal frustum structure. The lower bottom surface of the transmission part 51 is connected to one end of the connecting part 50. The upper bottom surface of the transmission part 51 is provided with a countersunk through hole 53 that penetrates the connecting part 50. The shovel base 5 is threadedly connected to the shovel base 2 by a screw passing through the countersunk through hole 53, thereby connecting the connecting part 50 to the shovel base 2. Three shovel base grooves 52 are provided, and the three shovel base grooves 52 are circumferentially and equally spaced on the side wall of the transmission part 51.
[0027] Further improvements, such as Figure 6 and Figure 7 As shown, the shovel base groove 52 has a T-shaped structure, and the axis of the shovel base groove 52 is inclined from the side away from the center of the transmission part 51 at the top to the side closer to the center of the transmission part 51 at the bottom. The slider 4 is provided with a transmission block 40 that slides in the shovel base groove 52. That is, the transmission block 40 is also a T-shaped structure. Preferably, the transmission block 40 is located on the upper side of the slider 4 near the side wall of the shovel base 5, so that the shovel base 5 can drive the slider 4 to slide for a sufficient stroke through the shovel base groove 52 and the transmission block 40.
[0028] Further improvements, such as Figure 1 and Figure 7As shown, an ejector spring 7 is provided between the bottom of the slot 30 of the front mold core 3 and the bottom of the shovel base 5. Preferably, the front mold core 3 has a blind hole at the bottom of the slot 30 that is coaxial with the countersunk through hole 53. The two ends of the ejector spring 7 are located on the bottom surface of the countersunk head of the countersunk through hole 53 and the bottom of the blind hole at the bottom of the slot, respectively. The ejector spring 7 is in a compressed state when the mold is closed. The ejector spring 7 prevents the rubber plug 21 from wearing out, which would cause the shovel base 2 to not travel enough, thus preventing the shovel base 5 from not opening the slider 4. This prevents damage to the undercut structure of the slider 4 when the product is removed from the front mold.
[0029] Further improvements, such as Figure 1 , Figure 5 and Figure 6 As shown, the anti-reset mechanism includes multiple positioning beads 8, which are disposed on the limiting block 6 at a position directly above the corresponding slider 4. There are three positioning beads 8. Each slider 4 has two positioning grooves 80 on its top surface that cooperate with the corresponding positioning bead 8. The two positioning grooves 80 are located on opposite sides of the top surface of the slider 4 in the sliding direction of the slider 4. That is, the two positioning grooves 80 correspond to the side of the top surface of the slider 4 that is closer to the shovel base 5 and the side that is farther away from the shovel base 5. The center distance between the two positioning grooves 80 is the stroke of the slider 4.
[0030] Further improvements, such as Figure 1 and Figure 5 As shown, a plurality of positioning blocks 32 are provided on the top surface of the front mold core 3, and a plurality of limiting grooves 60 are provided on the limiting block 6 for the positioning blocks 32 to be matched and inserted. Preferably, there are three positioning blocks 32 and three limiting grooves 60. The three positioning blocks 32 are circumferentially spaced on the top surface of the front mold core 3, and the three limiting grooves 60 are circumferentially spaced on the bottom surface of the limiting block 6.
[0031] Further improvements, such as Figure 1 , Figure 4 and Figure 5 As shown, the limiting block 6 has a circular structure. The top and bottom surfaces of the limiting block 6 abut against the shovel base 2 and the front mold core 3 respectively. The limiting block 6 is fixedly connected to the front mold core 3. Preferably, three circumferentially spaced connecting through holes with countersunk heads are provided on the top surface of the limiting block 6. Three threaded blind holes coaxial with the corresponding connecting through holes are provided on the top surface of the front mold core 3. The limiting block 6 and the front mold core 3 are fixedly connected together by screws, connecting through holes and threaded blind holes. The shovel base 5 passes through the center of the limiting block 6 and is inserted into the slot 30, that is, the shovel base 5 passes through the annular hole in the center of the limiting block 6.
[0032] Further improvements, such as Figure 3 and Figure 4As shown, the limiting mechanism includes a stop block 9. A limiting notch 20 extending vertically is provided at the edge of the top surface of the shovel base 2. The stop block 9 is embedded in the front template 11, and one end of the stop block 9 extends into the limiting notch 20. Preferably, the shovel base 2 is a cuboid structure. Two limiting notches 20 are provided on the top surface of each shovel base 2. The two limiting notches 20 are located at opposite corners of the top surface of the shovel base 2. The stroke of the shovel base 2 in the vertical direction is limited by the stop block 9 and the limiting notch 20, thereby allowing the shovel base 2 to separate from the sprue plate 1 and avoiding affecting the removal of the flow channel condensate on the sprue plate 1.
[0033] It should be understood that those skilled in the art can make improvements or modifications based on the above description, and all such improvements and modifications should fall within the protection scope of the appended claims.
Claims
1. A front mold sliding structure, comprising a sprue plate and a front mold plate arranged sequentially; characterized in that, The top surface of the front mold plate is embedded with a shovel base that slides up and down; the front mold plate is provided with a limiting mechanism to restrict the stroke of the shovel base; a rubber plug is provided on the top surface of the shovel base; a rubber plug hole is provided on the sprue plate to cooperate with the rubber plug to pull the shovel base; a front mold core is provided directly below the shovel base; multiple sliders that slide radially along the front mold core are embedded on the front mold core; a slot is provided on the top surface of the front mold core; a shovel base that matches the slot is provided at the bottom end of the shovel base; multiple shovel base grooves that drive the corresponding sliders to slide are provided on the side wall of the shovel base away from the shovel base; a limiting block is provided between the front mold core and the shovel base to restrict the up and down sliding of the sliders; an anti-reset mechanism is provided on the front mold core to prevent the shovel base from moving down and resetting after mold opening.
2. The front mold sliding structure according to claim 1, characterized in that, The shovel base includes a connecting part and a transmission part; the connecting part and the transmission part are integrally formed; the connecting part is connected to the shovel base seat; the transmission part has a regular hexagonal frustum structure; the lower bottom surface of the transmission part is connected to one end of the connecting part; the upper bottom surface of the transmission part is provided with a countersunk through hole penetrating the connecting part; three shovel base grooves are provided; the three shovel base grooves are circumferentially and equally spaced on the side wall of the transmission part.
3. The front mold sliding structure according to claim 2, characterized in that, The shovel base groove has a T-shaped structure; the axis of the shovel base groove is inclined from the side away from the center of the transmission part at the top to the side closer to the transmission part at the bottom; the slider is provided with a transmission block that matches and slides in the shovel base groove.
4. A front mold sliding structure according to claim 1 or 2, characterized in that, An ejector spring is provided between the bottom of the slot of the front mold core and the bottom of the shovel base.
5. A front mold sliding structure according to claim 1, characterized in that, The anti-reset mechanism includes multiple positioning beads; the multiple positioning beads are disposed on the limiting block at a position directly above the corresponding slider; each slider has two positioning grooves on its top surface that cooperate with the corresponding positioning beads; the two positioning grooves are located on opposite sides of the top surface of the slider in the slider sliding direction.
6. A front mold sliding structure according to claim 5, characterized in that, The top surface of the front mold core is provided with multiple positioning blocks; the limiting block is provided with multiple limiting slots for the positioning blocks to be matched and inserted.
7. A front mold sliding structure according to claim 1, characterized in that, The limiting block has a circular ring structure; the top and bottom surfaces of the limiting block abut against the shovel base and the front mold core respectively; the limiting block is fixedly connected to the front mold core; the shovel base passes through the center of the limiting block and is inserted into the slot.
8. A front mold sliding structure according to claim 1, characterized in that, The limiting mechanism includes a stop block; a limiting notch extending vertically is provided at the edge of the top surface of the shovel base; the stop block is embedded in the front template; one end of the stop block extends into the limiting notch.
9. A front mold sliding structure according to claim 1, characterized in that, The front mold core is provided with a plurality of mold core notches extending radially along the front mold core; the top of the mold core notch and both ends extending radially along the front mold core are open; the slider is slidably disposed in the corresponding mold core notch.