An inner slide block structure for a plastic mold
By introducing slide bars, pressure bars, limit bolts, and DLC coating into the slider structure inside the plastic mold, the problems of flash and sticking during demolding of the inner slider are solved, achieving a stable and low-loss demolding effect for plastic parts.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- FOSHAN YANXIU MOLD PARTS CO LTD
- Filing Date
- 2025-12-12
- Publication Date
- 2026-07-07
AI Technical Summary
Existing plastic molds with internal sliders are prone to flash and sticking to plastic parts during demolding, leading to problems such as wear or jamming of the plastic parts.
The internal slider structure design includes a slider, a pressure bar, a limit bolt, and a DLC coating. By reserving an expansion gap and using a low-friction coefficient coating, combined with the use of an inclined groove and a spring, stable demolding of the plastic part is achieved.
It effectively avoids flash and jamming of plastic parts during demolding, reduces friction loss, and improves sliding accuracy and the integrity of plastic parts.
Smart Images
Figure CN224465061U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of plastic mold technology, specifically to an internal slider structure for plastic molds. Background Technology
[0002] The internal slider structure is a core design feature in plastic molds for handling complex demolding issues, especially suitable for plastic parts with undercuts, side holes, or internal protrusions. It achieves non-destructive demolding of plastic parts by converting the vertical movement of the mold opening and closing into the horizontal movement of the slider.
[0003] In the process of realizing this invention, the inventors discovered at least the following problems in the prior art:
[0004] Existing plastic mold internal sliders are prone to flash during demolding under high temperature and pressure. In addition, if the plastic part sticks to the slider, it may cause wear or jamming during demolding.
[0005] Therefore, the aforementioned technical problems need to be solved. Utility Model Content
[0006] The purpose of this invention is to provide an internal slider structure for plastic molds, so as to solve the problems mentioned in the background art.
[0007] By adopting the above technical solution, the problem of the plastic part easily getting stuck and damaged when the plastic part sticks to the inner slider body during demolding is solved.
[0008] To solve the above-mentioned technical problems, this utility model provides the following technical solution:
[0009] An internal slider structure for a plastic mold includes a lower mold and an upper mold. A lower injection molding block is fixedly installed in the middle of the inner side of the lower mold. An inner slider body is slidably installed on both sides of the lower injection molding block. A sliding rod and a pressure rod are movably installed and fixedly connected inside the inner slider body. A first spring is sleeved on the outer side of the pressure rod. A first groove is formed at the bottom of the sliding rod. A first limiting bolt extending into the first groove is installed through a screw hole at the bottom of the inner slider body. An upper injection molding block is fixedly installed at the bottom of the upper mold, and an expansion gap is reserved between the lower injection molding block and the upper injection molding block.
[0010] Preferably, the front and rear ends of the bottom sides of the inner wall of the lower mold are provided with sliding grooves, and a sliding strip fixedly connected to the bottom of the inner slider body is slidably installed inside the sliding groove.
[0011] Preferably, L-shaped top blocks are provided on both sides of the bottom of the upper mold, and first bolts extending into the interior of the L-shaped top blocks are installed through both sides of the top of the upper mold.
[0012] Preferably, the front and rear ends of the top of the inner slider body are provided with inclined grooves, and the front and rear ends of the bottom inner side of the L-shaped top block are fixedly installed with inclined rods extending into the inclined grooves.
[0013] Preferably, the lower mold has a second groove located at the bottom of the lower injection molding block, and a second spring is uniformly fixedly installed inside the second groove.
[0014] Preferably, the lower mold has cavities at its front and rear ends, and the lower injection molding block has fixed plates that are slidably installed inside the cavities at its front and rear ends. The upper mold has support cylinders that extend through the lower mold and into the cavities at its bottom front and rear ends. A buffer rod that contacts the fixed plate is movably installed inside the support cylinder, and a third spring that is fixedly connected to the buffer rod is fixedly installed inside the support cylinder.
[0015] Preferably, the upper mold and the upper injection block are provided with an injection port, and a second bolt is rotatably installed in the screw holes on both sides of the bottom of the lower mold inner wall.
[0016] Preferably, a second limiting bolt is rotatably installed through the screw holes on both sides of the bottom of the lower mold. A fourth spring is fixedly installed inside the mounting groove at the top of the second limiting bolt. A support plate is fixedly installed at the top of the fourth spring. A steel ball is movably installed at the top of the support plate. An arc groove is opened at the bottom of the inner slider body, through which the steel ball slides.
[0017] Compared with the prior art, this utility model provides an internal slider structure for plastic molds, which has the following beneficial effects:
[0018] 1. By setting sliding rods and pressure rods inside the inner slider body, when the inner slider body slides to both sides for demolding, if the plastic part sticks to the inner slider body, one end of the pressure rod also sticks to the plastic part. Under the elastic force of the first spring, the pressure rod exerts pressure on the molded plastic part. At this time, the two inner slider bodies slide to both sides. Under the pressure of the pressure rod, the plastic part remains stationary. Subsequently, the plastic part separates from the inner side of the inner slider body, and the inner slider body continues to slide. At this time, the top of the first limiting bolt slides outward inside the first groove. Since the contact area between the pressure rod and the plastic part is small, the first limiting bolt drives the sliding rod and pressure rod to separate from the plastic part, thus realizing the demolding operation. This avoids the situation where the plastic part sticks to the inner slider body during demolding in the traditional way, which can easily cause jamming and damage to the plastic part.
[0019] 2. By leaving a sufficient expansion gap between the lower and upper injection molding blocks, and applying a DLC coating, the DLC coating, which is an amorphous thin film composed of carbon elements, has excellent properties such as high hardness, low coefficient of friction, wear resistance, corrosion resistance and chemical inertness. This prevents flash from occurring during injection molding of plastic parts, while reducing friction loss and improving sliding accuracy. Attached Figure Description
[0020] Figure 1 This is a front view structural diagram of the present utility model;
[0021] Figure 2 This is a top view of the lower mold structure of this utility model;
[0022] Figure 3 This is a side sectional view of the present invention.
[0023] Figure 4 This is a frontal cross-sectional view of the lower mold of this utility model;
[0024] Figure 5 This is a front view cross-sectional structural diagram of the second groove of this utility model;
[0025] Figure 6 This is a frontal cross-sectional view of the upper mold of this utility model;
[0026] Figure 7 This is a front view cross-sectional structural diagram of the inner slider of this utility model;
[0027] Figure 8 This is a front view cross-sectional structural diagram of the inclined groove of this utility model;
[0028] Figure 9 This is a front view cross-sectional structural diagram of the second limiting bolt of this utility model;
[0029] Figure 10 For the present utility model Figure 3 A magnified schematic diagram of the structure at point A in the middle.
[0030] In the diagram: 1. Lower mold; 101. Lower injection molding block; 102. Inner slider; 103. Slide rod; 104. Pressure rod; 105. First spring; 106. First groove; 107. First limiting bolt; 108. Slide groove; 109. Slide bar; 110. Fixing plate; 111. Inclined groove; 112. Arc groove; 2. Upper mold; 201. Upper injection molding block; 202. L-shaped top block; 203. First bolt; 204. Inclined rod; 205. Injection port; 3. Second groove; 301. Second spring; 4. Cavity; 401. Support cylinder; 402. Buffer rod; 403. Third spring; 5. Second bolt; 6. Second limiting bolt; 601. Fourth spring; 602. Support plate; 603. Steel ball. Detailed Implementation
[0031] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.
[0032] As described in the background section, there are shortcomings in the existing technology. In order to solve the above-mentioned technical problems, this application proposes an internal slider structure for plastic molds.
[0033] Please see Figures 1-10 An inner slider structure for a plastic mold includes a lower mold 1 and an upper mold 2. A lower injection molding block 101 is fixedly installed in the middle of the inner side of the lower mold 1. Inner slider bodies 102 are slidably installed on both sides of the lower injection molding block 101 on the inner side of the lower mold 1. A sliding rod 103 and a pressure rod 104 are movably installed and fixedly connected inside the inner slider body 102. A first spring 105 is sleeved on the outer side of the pressure rod 104. A first groove 106 is formed at the bottom of the sliding rod 103. A threaded hole extending to the first groove is installed through the screw hole at the bottom of the inner slider body 102. The first limiting bolt 107 inside 106, the bottom of the upper mold 2 is fixedly installed with an upper injection molding block 201, and an expansion gap is reserved between the lower injection molding block 101 and the upper injection molding block 201. L-shaped top blocks 202 are provided on both sides of the bottom of the upper mold 2. The first bolt 203 extending into the interior of the L-shaped top block 202 is installed through both sides of the top of the upper mold 2. The front end and rear end of the top of the inner slider body 102 are provided with inclined grooves 111. The front end and rear end of the bottom of the inner side of the L-shaped top block 202 are fixedly installed with inclined rods 204 extending into the inclined grooves 111.
[0034] Through the above structural design, the internal slider structure of this plastic mold reserves sufficient expansion gap between the lower injection molding block 101 and the upper injection molding block 201, and simultaneously applies a DLC coating. Since the DLC coating is an amorphous thin film composed of carbon elements, it possesses excellent properties such as high hardness, low coefficient of friction, wear resistance, corrosion resistance, and chemical inertness, preventing flash during injection molding of the plastic part, reducing frictional loss, and improving sliding accuracy. The L-shaped top block 202 is fixed to both sides of the bottom of the upper mold 2 by the first bolt 203, facilitating disassembly and maintenance by personnel. When the plastic part is demolded after injection molding, the upper mold 2 lifts upwards, and the L-shaped top block 202 drives the inclined rod 204 upwards. Since both the inclined rod 204 and the inclined groove 111 are inclined, the inclined rod 204 slides upwards inside the inclined groove 111, driving the two sets of internal slider bodies 1... 02 Slide to both sides for demolding. If the plastic part sticks to the inner slider body 102 under high temperature and pressure, one end of the pressure rod 104 also sticks to the plastic part. Under the elastic force of the first spring 105, the pressure rod 104 exerts pressure on the molded plastic part. At this time, the two inner slider bodies 102 slide to both sides. Under the pressure of the pressure rod 104, the plastic part remains stationary. Then the plastic part separates from the inner side of the inner slider body 102. The inner slider body 102 continues to slide. At this time, the top of the first limiting bolt 107 slides outward inside the first groove 106. Since the contact area between the pressure rod 104 and the plastic part is small, the first limiting bolt 107 drives the slide rod 103 and the pressure rod 104 to separate from the plastic part, thus realizing the demolding operation. This solves the problem that the plastic part is easily jammed and damaged when the inner slider body 102 sticks to the inner slider body 102 during demolding.
[0035] Furthermore, grooves 108 are provided on the front and rear ends of both sides of the bottom of the inner wall of the lower mold 1. A slide bar 109, which is fixedly connected to the bottom of the inner slider body 102, is slidably installed inside the groove 108. When the inner slider body 102 slides, the slide bar 109 slides inside the groove 108 to limit the inner slider body 102, preventing it from derailing and making the sliding of the inner slider body 102 more stable.
[0036] Furthermore, the lower mold 1 has a second groove 3 located at the bottom of the lower injection molding block 101, and a second spring 301 is uniformly fixedly installed inside the second groove 3. When the plastic part is demolded, the lower injection molding block 101 rises upward under the elastic force of the second spring 301, lifting the plastic part and making it easier to demold.
[0037] Furthermore, the lower mold 1 has cavities 4 at its front and rear ends. The lower injection molding block 101 has fixed plates 110 that are slidably installed inside the cavities 4 at its front and rear ends. The upper mold 2 has support cylinders 401 that extend through the lower mold 1 into the cavity 4 at its front and rear ends. The support cylinder 401 has a buffer rod 402 that is movably installed inside the support cylinder 401 and contacts the fixed plate 110. The support cylinder 401 also has a third spring 403 that is fixedly connected to the buffer rod 402. When the plastic part is demolded, the upper mold 2 moves upward and slides inside the inclined groove 111 via the inclined rod 204, causing the inner slider body 102 to slide. At the same time, the support cylinder 401 moves upward inside the cavity 4. Under the elastic force of the third spring 403, the bottom end of the buffer rod 402 still exerts a squeezing force on the fixed plate 110. When the inner slider body 102 moves and both sides of the plastic part are completely demolded, the upper mold 2 rises to a suitable height so that the third spring 403 is in a relaxed state. Then, the support cylinder 401 continues to drive the buffer rod 402 to rise, so that the lower injection molding block 101 can be lifted up by the elastic force of the second spring 301 for demolding. This achieves the goal of demolding both sides of the plastic part from the inner slider body 102 first, and then lifting the plastic part by the lower injection molding block 101. This avoids the situation where the plastic part is not demolded from the inner slider body 102 when it is lifted up, which would cause damage to the plastic part.
[0038] Furthermore, an injection port 205 is provided through the interior of the upper mold 2 and the upper injection molding block 201, and a second bolt 5 is rotatably installed in the screw holes on both sides of the bottom of the inner wall of the lower mold 1. The injection port 205 facilitates injection molding operations. When the two sets of inner slider bodies 102 slide to both sides inside the lower mold 1, the second bolt 5 blocks and limits the movement of the inner slider bodies 102, so that the inner slider bodies 102 stop moving after sliding to the appropriate position.
[0039] Furthermore, second limiting bolts 6 are rotatably installed through the screw holes on both sides of the bottom of the lower mold 1. A fourth spring 601 is fixedly installed inside the mounting groove at the top of the second limiting bolt 6. A support plate 602 is fixedly installed at the top of the fourth spring 601. A steel ball 603 is movably installed at the top of the support plate 602. The bottom of the inner slider body 102 has an arc groove 112 in which the steel ball 603 slides. When the two sets of inner slider bodies 102 slide to the appropriate position and stop, under the elastic force of the fourth spring 601, the support plate 602 lifts the steel ball 603 and extends it into the arc groove 112 to limit the inner slider body 102, so that the inner slider body 102 stops more stably in the appropriate position. When the inner slider body 102 moves inward to perform injection molding again, the steel ball 603 retracts into the mounting groove at the top of the second limiting bolt 6 under the squeezing force of the inner slider body 102, thereby making the injection and demolding of the plastic part more convenient.
[0040] Working principle:
[0041] During injection molding, molten plastic material is injected into the mold through injection port 205. At this time, the lower mold 1 and the upper mold 2 are closed. The expansion gap reserved between the lower injection block 101 and the upper injection block 201, as well as the applied DLC coating, play a role in preventing flash from occurring on the plastic part under high temperature and high pressure, while reducing friction loss and improving sliding accuracy. After injection molding is completed, the demolding stage begins. The upper mold 2 is lifted upward, and the L-shaped top block 202 drives the inclined rod 204 to rise. Since both the inclined rod 204 and the inclined groove 111 are inclined, the inclined rod 204 slides upward inside the inclined groove 111, driving the two sets of inner slider bodies 102 to slide to both sides. If the plastic part is stuck to the inner slider body 102, and one end of the pressure rod 104 is also stuck to the plastic part, the pressure rod 104 exerts pressure on the molded plastic part under the elastic force of the first spring 105. When the two inner slider bodies 102 slide to both sides, the plastic part remains stationary under the pressure of the pressure rod 104. Subsequently, the plastic part separates from the inner side of the inner slider body 102, and the inner slider body 102 continues to slide. The top of the first limiting bolt 107 slides outward inside the first groove 106. Because the contact area between the pressure rod 104 and the plastic part is small, the first limiting bolt 107 drives the slide rod 103 and the pressure rod 104 to separate from the plastic part, completing the demolding operation and solving the problem of the plastic part sticking, jamming, and being damaged by the inner slider body 102. During the sliding process of the inner slider body 102, the slide bar 109 slides inside the slide groove 108, limiting the inner slider body 102 and making its sliding more stable. When the plastic part is demolded, the upper mold 2 moves upward and drives the inner slider body 102 to slide through the inclined rod 204. The support cylinder 401 moves upward inside the cavity 4. Under the elastic force of the third spring 403, the bottom end of the buffer rod 402 has a squeezing force on the fixed plate 110. When the inner slider body 102 moves and the two sides of the plastic part are completely demolded, the upper mold 2 rises to a suitable height, the third spring 403 relaxes, and the lower injection molding block 101 is lifted up under the elastic force of the second spring 301. This achieves the demolding of the two sides of the plastic part from the inner slider body 102 first, and then the lower injection molding block 101 lifts up the plastic part, avoiding damage to the plastic part. When the two sets of inner slider bodies 102 slide to the appropriate positions and stop, under the elastic force of the fourth spring 601, the support plate 602 lifts the steel ball 603 and extends it into the arc groove 112, limiting the inner slider body 102 and making it stop stably; when the inner slider body 102 moves inward and is injected again, the steel ball 603 shrinks into the mounting groove at the top of the second limiting bolt 6 under the squeezing force of the inner slider body 102, which facilitates the injection and demolding of the plastic part.
[0042] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.
Claims
1. An internal slider structure for a plastic mold, comprising a lower mold (1) and an upper mold (2), characterized in that: A lower injection molding block (101) is fixedly installed in the middle of the inner side of the lower mold (1). An inner slider body (102) located on both sides of the lower injection molding block (101) is slidably installed on both sides of the inner side of the lower mold (1). A slide rod (103) and a pressure rod (104) are fixedly connected and movably installed inside the inner slider body (102). A first spring (105) is sleeved on the outside of the pressure rod (104). A first groove (106) is opened at the bottom of the slide rod (103). A first limiting bolt (107) extending into the first groove (106) is installed through the screw hole at the bottom of the inner slider body (102). An upper injection molding block (201) is fixedly installed at the bottom of the upper mold (2), and an expansion gap is reserved between the lower injection molding block (101) and the upper injection molding block (201).
2. The internal slider structure for a plastic mold according to claim 1, characterized in that: The lower mold (1) has a sliding groove (108) on the front and rear sides of the bottom of the inner wall. A sliding strip (109) that is fixedly connected to the bottom of the inner slider body (102) is slidably installed inside the sliding groove (108).
3. The internal slider structure for a plastic mold according to claim 1, characterized in that: The upper mold (2) has L-shaped top blocks (202) on both sides of its bottom, and the upper mold (2) has first bolts (203) extending into the L-shaped top blocks (202) installed through both sides of its top.
4. The internal slider structure for a plastic mold according to claim 3, characterized in that: The front and rear ends of the top of the inner slider body (102) are provided with inclined grooves (111), and the front and rear ends of the bottom of the inner side of the L-shaped top block (202) are fixedly installed with inclined rods (204) extending into the inclined grooves (111).
5. The internal slider structure for a plastic mold according to claim 1, characterized in that: The lower mold (1) has a second groove (3) located at the bottom of the lower injection molding block (101) inside, and a second spring (301) is uniformly fixed inside the second groove (3).
6. The internal slider structure for a plastic mold according to claim 1, characterized in that: The lower mold (1) has cavities (4) at its front and rear ends. The lower injection molding block (101) has a fixed plate (110) that is slidably installed inside the cavity (4) at its front and rear ends. The upper mold (2) has a support cylinder (401) that extends through the lower mold (1) into the cavity (4) at its front and rear ends. A buffer rod (402) that contacts the fixed plate (110) is movably installed inside the support cylinder (401). A third spring (403) that is fixedly connected to the buffer rod (402) is fixedly installed inside the support cylinder (401).
7. The internal slider structure for a plastic mold according to claim 1, characterized in that: The upper mold (2) and the upper injection block (201) are provided with an injection port (205) that runs through them. The lower mold (1) is provided with a second bolt (5) that is rotatably installed in the screw holes on both sides of the bottom of the inner wall.
8. The internal slider structure for a plastic mold according to claim 1, characterized in that: The screw holes on both sides of the bottom of the lower mold (1) are through which the second limiting bolt (6) is rotatably installed. The mounting groove at the top of the second limiting bolt (6) is fixedly provided with a fourth spring (601). The top of the fourth spring (601) is fixedly installed with a support plate (602). The top of the support plate (602) is movably provided with a steel ball (603). The bottom of the inner slider body (102) is provided with an arc groove (112) in which the steel ball (603) slides.