Injection mold capable of delaying sliding block, preventing collision and automatically separating product water gap
By using a slider delay and anti-collision design, combined with an inclined guide post hole and anti-collision ejector pin structure, the problem of sticking to the mold of the suction source parts of the medical negative pressure ball assembly is solved, realizing automated demolding and separation of sprue material without manual trimming, thus improving production efficiency and mold life.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- JIANGSU YANGTZE RIVER MEDICAL TECH CORP
- Filing Date
- 2025-06-04
- Publication Date
- 2026-05-19
AI Technical Summary
The suction source components on the medical negative pressure ball assembly tend to adhere to the surface of the front mold cavity after injection molding, making demolding difficult and affecting production cycle and mold life.
The design incorporates a slider delay and anti-collision features. The slider delay core pulling is achieved through the waist-shaped oblique guide post hole and anti-collision ejector pin structure. A gate cavity is set inside the slider insert to automatically separate the sprue material. Combined with wear-resistant plates and elastic limit clamps, the slider movement is ensured to be stable.
It effectively prevents products from sticking to the mold, improves demolding efficiency, extends mold life, reduces frictional wear, and enables automated demolding and separation of sprue material without manual trimming.
Smart Images
Figure CN224255957U_ABST
Abstract
Description
Technical Field
[0001] This utility model belongs to the field of mold technology, specifically relating to an injection mold with slider delay, anti-collision, and automatic separation of product sprue. Background Technology
[0002] Medical negative pressure bulb assemblies are negative pressure drainage and suction devices widely used in medical devices. Their precise structural design typically includes several sub-components such as interface fittings for connecting to the suction source, the bulb itself, and a check valve. Among these, the fittings for connecting to the suction source are a crucial component of the entire negative pressure bulb system, and their injection molding quality directly affects the overall device's sealing performance and operational safety.
[0003] Currently, the suction source components for medical negative pressure ball assemblies are mostly manufactured using traditional cold runner injection molding processes, with submarine gate injection being the most common method. Due to the structural characteristics of this component, it has a large contact area with the front mold, especially in areas such as the product's inner cavity or flange. This makes it prone to forming a tight-fitting effect after injection molding and cooling, resulting in significant sticking forces during demolding. The component easily adheres to the surface of the front mold cavity, severely impacting production cycle time and mold lifespan. Utility Model Content
[0004] To solve the above problems, this utility model provides an injection mold with slider delay, anti-collision, and automatic separation of product sprue, including a front mold and a rear mold. The front mold includes a fixed mold base plate, a hot runner mounting plate, a front mold core plate, and a front mold core stacked sequentially. The hot runner mounting plate has a hot runner structure that connects to the sprue cavity. A front mold insert is nested on the front mold core, and a front mold pin is nested on the front mold insert. Angled guide pillars are provided on both sides of the front mold core on the front mold core plate. The rear mold includes a moving mold base plate, a push plate, a push rod fixing plate, a rear mold core plate, and a rear mold core stacked sequentially. A stroke cavity is provided between the moving mold base plate and the rear mold core plate for the push plate and push rod fixing plate to move toward or away from the rear mold core. A rear mold insert is nested on the rear mold core. The rear mold core plate has sliding slider seats on both sides of the rear mold core. The slider seats have waist-shaped oblique guide post holes that match the oblique guide posts. The slider seats slide with the oblique guide posts. Slider inserts are connected to the opposite sides of the slider seats on both sides. The moving mold base plate is positioned with an ejector pin. The ejector sleeve is positioned on the push rod fixing plate. The ejector pin and ejector sleeve are coaxially arranged and both extend upward through the rear mold core. After the front mold core, front mold insert, front mold insert pin, rear mold core, rear mold insert, ejector pin, ejector sleeve and slider insert are closed, a product cavity is formed. The product cavity is connected to the sprue cavity. The slider insert and the rear mold core together form the undercut structure on the outside of the product.
[0005] Preferably, the push rod fixing plate is also provided with a sprue ejector pin and an anti-collision ejector pin. An anti-collision ejector pin through hole is provided between the slider seat and the slider insert. The sprue ejector pin passes through the rear mold core plate and extends into the sprue material cavity. When the sprue ejector pin ejects the sprue material, the anti-collision ejector pin passes through the rear mold core plate and extends into the anti-collision ejector pin through hole. A sprue pull ring is nested on the rear mold core. The sprue pull ring and the sprue ejector pin are coaxially arranged.
[0006] Preferably, the end of the sprue cavity is provided with a gate cavity, which is opened inside the slider insert and is connected to the product cavity.
[0007] Preferably, the front mold core plate is provided with inclined guide post seats on both sides of the front mold core, the inclined guide post is positioned on the inclined guide post seat, the inclined guide post seat is provided with an inclined surface below the inclined guide post seat, the end of the slider seat away from the slider insert is provided with a contact inclined surface that matches the inclined surface of the inclined guide post seat, and a first slider wear plate is connected to the contact inclined surface.
[0008] Preferably, the rear mold core plate is provided with a second slider wear-resistant plate at the bottom of the slider seat, the rear mold core plate is provided with slider pressure strips on both sides of the slider seat, the slider seat is provided with lugs on both sides, the lugs are located between the second slider wear-resistant plate and the slider pressure strips, and the rear mold core plate is also provided with a third slider wear-resistant plate, the third slider wear-resistant plate being located in the middle of the slider seat.
[0009] Preferably, the second slider wear plate is provided with an elastic limiting clamp in the middle, and the second slider wear plate is provided with a limiting bolt on the side away from the slider insert. The bottom surface of the slider seat is provided with a V-shaped clearance groove on both the side near and away from the slider insert.
[0010] The advantages of this utility model are:
[0011] 1. In this design, the oblique guide post hole on the slider seat is an oblong hole. When the mold opens, the slider seat will only contact the oblique guide post after the rear mold moves a certain distance. This can realize the function of delayed core pulling of the slider when the front and rear molds are separated. Then, with the help of the product's undercut structure, it can be pulled away from the front mold and left in the rear mold, which can effectively prevent the product from sticking to the front mold.
[0012] 2. This solution is equipped with anti-collision ejector pins. There is an anti-collision ejector pin through hole between the slider seat and the slider insert. After the slider core is pulled out, the anti-collision ejector pin is exactly coaxial with the through hole. If the ejector pin does not return to its original position after the product is ejected, the anti-collision ejector pin is in the through hole, which can prevent the slider from returning to its original position and avoid damage to the mold.
[0013] 3. In this solution, the gate cavity is located inside the slider insert. The gate cavity is connected to the product cavity. When the lateral slider seat is pulled, the slider insert drives the sprue material in the inner gate cavity to be directly separated from the molded product without manual trimming. This facilitates the simultaneous ejection of the product and sprue material by the ejector and the sprue ejector pin. Attached Figure Description
[0014] Figure 1 This is a front sectional view of the present invention.
[0015] Figure 2 This is a side view sectional structural diagram of the present invention.
[0016] Figure 3 This is an enlarged structural diagram of the cavity portion of the product of this utility model.
[0017] Figure 4 This is an enlarged structural diagram of the waist-shaped oblique guide post hole of this utility model.
[0018] Figure 5 This is a three-dimensional structural diagram of the slider seat and slider insert of this utility model.
[0019] Figure 6 This is a cross-sectional structural diagram of the slider seat and slider insert of this utility model.
[0020] Figure 7 This is a top view of the slider insert of this utility model.
[0021] Figure 8 This is an enlarged structural diagram of the gating cavity of this utility model.
[0022] In the diagram: Front mold 10, rear mold 20, fixed mold base plate 107, hot runner mounting plate 108, front mold core plate 104, front mold core 101, front mold insert 105, front mold insert pin 106, cooling water jacket 110, inclined guide pillar seat 103, inclined guide pillar 102, rear mold core 201, rear mold insert 209, ejector pin 210, ejector sleeve 211, sprue ejector pin 215, sprue pull ring 217, anti-collision ejector pin 216. Rear mold core plate 206, slider insert 203, slider pressure strip 204, slider seat 202, second slider wear plate 205, first slider wear plate 207, third slider wear plate 208, elastic limit clamp 218, limit bolt 219, push plate 214, push rod fixing plate 213, moving mold base plate 212, product outer undercut structure 220, waist-shaped oblique guide post hole 2021, sprue cavity 2022. Detailed Implementation
[0023] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention.
[0024] In the description of this utility model, it should be noted that the terms "upper", "lower", "inner", "outer", "front end", "rear end", "both ends", "one end", "the other end", 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 utility model 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 utility model.
[0025] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installed," "equipped with," and "connected," etc., should be interpreted broadly. For example, "connected" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be a connection within two components. Simultaneously, when an component is referred to as "fixed to" or "equipped on" another component, it can be directly on the other component or may have an intervening component present. When an component is referred to as "connected to" another component, it can be directly connected to the other component or may have an intervening component present. When an component is referred to as "fixedly connected to" another component, it can be a common fixed connection method such as welding, bolting, or gluing. In short, those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.
[0026] Example 1, as Figure 1-2 As shown, an injection mold with slider delay, anti-collision, and automatic separation of product sprues includes a front mold 10 and a rear mold 20. The front mold 10 includes a fixed mold base plate 107, a hot runner mounting plate 108, a front mold core plate 104, and a front mold core 101 stacked sequentially. The hot runner mounting plate 108 is provided with a hot runner structure, which connects to each sprue cavity 2022, and the sprue cavity 2022 is connected to the corresponding product mold cavity. A front mold insert 105 is nested on the front mold core 101, and a front mold pin 106 is nested on the front mold insert 105.
[0027] Combination Figure 1The hot runner structure includes a main nozzle 1091, a manifold 1092, and a sub-nozzle 1093. Each of the main nozzle 1091, manifold 1092, and sub-nozzle 1093 has internal heating and temperature control elements and interconnected melt channels. The sub-nozzle 1093 passes through the front mold core plate 104 and extends to the sprue cavity 2022. The main nozzle 1011 contacts the injection molding machine nozzle ball head. The molten material flows through the main nozzle 1011, manifold 1012, and sub-nozzle 1013 into the sprue cavity 2022, and then into each product mold cavity. Several cooling water jackets 110 are also nested on the front mold core 101. The cooling water jackets 110 are coaxially arranged with the sub-nozzles 1013 and located at the inlet end of each sprue cavity 2022. The cooling water jacket 110 is an annular cooling water channel set between the lower end of the sub-nozzle 1013 and the inlet of the sprue cavity 2022. The cooling water jacket 110 is used to effectively cool the transition area of the molten material from the outlet of the sub-nozzle 1013 to the inlet of the sprue cavity, so as to improve the product quality and shorten the cooling cycle.
[0028] The rear mold 20 includes a moving mold base plate 212, a push plate 214, a push rod fixing plate 213, a rear mold core plate 206, and a rear mold core 201 arranged in sequence. A stroke cavity is provided between the moving mold base plate 212 and the rear mold core plate 206 for the push plate 214 and the push rod fixing plate 213 to move toward or away from the rear mold core 201. A rear mold insert 209 is nested on the rear mold core 201. Sliding slider seats 202 are slidably provided on both sides of the rear mold core 201 on the rear mold core plate 206. Sliding slider inserts 203 are connected to the opposite side of the sliding slider seats 202 on both sides. A ejector pin 210 is positioned on the moving mold base plate 212. An ejector sleeve 211 is positioned on the push rod fixing plate 213. The ejector pin 210 and the ejector sleeve 211 are coaxially arranged and both extend upward through the rear mold core 201. The ejector sleeve 211 is sleeved outside the ejector pin 210 and is used to eject the molded product.
[0029] The front mold core 101, front mold insert 105, front mold pin 106, rear mold core 201, rear mold insert 209, ejector pin 210, ejector sleeve 211, and side slider inserts 203, after mold closing, form the product cavity. The product cavity is connected to the sprue cavity 2022. The slider inserts 203 and the rear mold core 201 together constitute the undercut structure 220 on the outer side of the product. Figure 3 As shown, the bottom edge of the slider insert 203 protrudes a portion towards the product cavity relative to the rear mold core 201. After the product is formed, a portion of its outer periphery will be overturned under the slider insert 203. As long as the slider insert 203 remains stationary, it will obstruct the movement of the formed product towards the front mold 10.
[0030] Combination Figure 4 and Figure 5The front mold core plate 104 has inclined guide pillars 102 on both sides of the front mold core 101. The slider seat has waist-shaped inclined guide pillar holes 2021 that match the inclined guide pillars 102. The slider seat and the inclined guide pillars 102 are slidably engaged. The front mold core plate 104 has inclined guide pillar seats 103 on both sides of the front mold core 101. The inclined guide pillars 102 are positioned on the inclined guide pillar seats 103. The inclined guide pillar seats 103 have an inclined surface below them. The end of the slider seat 202 away from the slider insert 203 has a contact inclined surface that matches the inclined surface of the inclined guide pillar seat 103. The first slider wear plate 207 is connected to the contact inclined surface. The front mold 1 is fixed and the sliding engagement between the inclined guide pillars 102 and the slider seat 202 is driven by the rear mold 2 moving away from or closer to the front mold 1, thereby driving the inclined guide pillar seats 103 and the slider seat 202 to push or separate. During mold closing, the inclined guide post 102 is entirely positioned within the oblong inclined guide post hole 2021. Due to the structure of the oblong hole, there is a gap between the inclined guide post 102 and the side of the oblong inclined guide post hole 2021 closest to the inclined guide post seat 103. When the mold opens, the rear mold 20 moves a certain distance before the slider seat 202 contacts the inclined guide post 102. This allows the slider seat 202 to delay core pulling during mold separation between the front and rear molds 20, meaning that the slider seat 202 remains stationary for an initial period during mold opening. The product's undercut structure then pulls the product away from the front mold 10 and onto the rear mold 20, effectively preventing the product from sticking to the front mold 10.
[0031] Combination Figure 1The push rod fixing plate 213 is also equipped with a sprue ejector pin 215 and an anti-collision ejector pin 216. An anti-collision ejector pin through hole 2161 is opened between the slider seat 202 and the slider insert 203. The sprue ejector pin 215 passes through the rear mold core plate 206 and the rear mold core 201 and extends into the sprue material cavity 2022. When the sprue ejector pin 215 ejects the sprue material, the anti-collision ejector pin 216 passes through the rear mold core plate 206 and extends into the anti-collision ejector pin through hole 2161. The ejector sleeve 211, the sprue ejector pin 215, and the anti-collision ejector pin 216 are all positioned on the push rod fixing plate 213, which can realize three synchronous actions: the ejector sleeve 211 ejects the product, the sprue ejector pin 215 ejects the sprue material, and the anti-collision ejector pin 216 is inserted into the anti-collision ejector pin through hole 2161. During mold opening, the slider seat 202 moves towards the side away from the product cavity via the inclined guide post 102. After the slider seat 202 completes the lateral core pulling, the anti-collision ejector pin through hole 2161 is coaxial with the anti-collision ejector pin 216. Therefore, when the ejector sleeve 211 ejects the product and the sprue ejector pin 215 ejects the sprue material, the anti-collision ejector pin 216 will be inserted into the anti-collision ejector pin through hole 2161. If the sprue ejector pin 215 fails to return to its original position, the anti-collision ejector pin 216 will remain within this through hole, preventing the slider seat 202 from returning to its original position and thus avoiding collision between the slider insert 203 and the sprue ejector pin 215, preventing mold damage. A sprue pull ring 217 is nested on the rear mold core 201. The sprue pull ring 217 is coaxially arranged with the sprue ejector pin 215. The sprue pull ring 217 holds the sprue material during mold opening, keeping the sprue material on the rear mold 20 side.
[0032] The end of the sprue cavity 2022 is provided with a gating cavity. Each gating cavity is integrally formed inside the slider insert 203. The gating cavity is connected to the product cavity and combined with... Figure 7-8 The adjacent first and second gate cavities 2031 and 2032 are each set at the same angle on the left and right sides, respectively, and are located within the left and right side slider inserts 203. When pulling the core from the side slider seat 202, the traditional gate cavity is composed of two side slider inserts 203 joined together. Therefore, after the two side slider inserts 203 separate, they do not exert force on the sprue material inside the gate cavity, and the sprue material inside the gate cavity cannot be separated from the molded product, requiring manual trimming. However, in this solution, the slider insert 203, when moving, can directly separate the sprue material inside the inner gate cavity from the molded product, thus... Figure 7 For example, the slider insert 203 on the left moves the first gate cavity 2031 to the left, and the slider insert 203 on the right moves the second gate cavity 2032 to the right. The sprue material in the gate cavity is separated from the molded product directly by the movement of the slider inserts 203 on both sides, without the need for manual trimming. This makes it easier for the ejector 211 and the sprue ejector pin 215 to eject the product and sprue material simultaneously.
[0033] Combination Figure 2 and Figure 5A first slider wear-resistant plate 207 is connected to the contact slope of the slider seat 202. A second slider wear-resistant plate 205 is provided on the rear mold core plate 206 at the bottom of the slider seat 202. Slider pressure strips 204 are provided on both sides of the slider seat 202 on the rear mold core plate 206. Lugs are provided on both sides of the slider seat 202, located between the second slider wear-resistant plate 205 and the slider pressure strips 204. A third slider wear-resistant plate 208 is also provided on the rear mold core plate 206, located in the middle of the slider seat 202. The first slider wear-resistant plate 207, the second slider wear-resistant plate 205, and the third slider wear-resistant plate can effectively reduce friction loss and extend the service life of key sliding components. Through the above design measures, this scheme can effectively prevent displacement or vibration during slider movement, ensuring the stability of the mold during mold closing, mold opening, and demolding, thereby improving the precision and quality of product molding.
[0034] Combination Figure 6 The second slider wear plate 205 has an elastic limiting clamp 218 in the middle, and a limiting bolt 219 is provided on the side of the second slider wear plate 205 away from the slider insert 203. V-shaped clearance grooves are provided on the bottom surface of the slider seat 202 on both the side close to and away from the slider insert 203. Both the elastic limiting clamp 218 and the limiting bolt 219 are bolted to the rear mold core plate 206. The bottom surface of the slider seat 202 is provided with V-shaped clearance grooves on both sides near and away from the slider insert 203. The stroke range of the slider seat 202 is between the two V-shaped clearance grooves. The top surface of the elastic limiting clamp 218 contains a corresponding V-shaped protrusion and has a spring inside. When the bottom plane of the slider seat 202 contacts the V-shaped protrusion of the elastic limiting clamp 218, the spring is compressed and the V-shaped protrusion retracts. When the slider seat 202 slides left and right to the position of the V-shaped clearance groove, the spring compression force of the elastic limiting clamp 218 is released, and the V-shaped protrusion and the V-shaped clearance groove cooperate to limit the slider seat moving towards or away from the cavity of the rear mold core 201. The limiting bolt 219 is used to further prevent the slider seat 202 from moving outward.
[0035] 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 injection mold with slider delay, anti-collision, and automatic separation of product sprue, characterized in that: The system includes a front mold (10) and a rear mold (20). The front mold (10) includes a fixed mold base plate (107), a hot runner mounting plate (108), a front mold core plate (104), and a front mold core (101) stacked in sequence. The hot runner mounting plate (108) is provided with a hot runner structure, which is connected to the sprue cavity (2022). A front mold insert (105) is nested on the front mold core (101), and a front mold pin (106) is nested on the front mold insert (105). The front mold core plate (104) is mounted on the rear mold core plate. The front mold core (101) has inclined guide pillars (102) on both sides. The rear mold (20) includes a moving mold base plate (212), a push plate (214), a push rod fixing plate (213), a rear mold core plate (206), and a rear mold core (201) stacked in sequence. A stroke cavity is provided between the moving mold base plate (212) and the rear mold core plate (206) for the push plate (214) and the push rod fixing plate (213) to move toward or away from the rear mold core (201). A rear mold insert (209) is nested on the rear mold core (201). On the core plate (206), slider seats (202) are slidably provided on both sides of the rear mold core (201). The slider seats (202) have waist-shaped oblique guide post holes (2021) that match the oblique guide post (102). The slider seats (202) and the oblique guide post (102) are slidably engaged. Slider inserts (203) are connected to the opposite sides of the two slider seats (202). The moving mold base plate (212) is provided with a ejector pin (210). The push rod fixing plate (213) is provided with an ejector sleeve (211). The ejector pin (210) and ejector sleeve (211) are coaxially arranged and both extend upward through the rear mold core (201). The front mold core (101), front mold insert (105), front mold insert pin (106), rear mold core (201), rear mold insert (209), ejector pin (210), ejector sleeve (211) and slider insert (203) form a product cavity after the mold is closed. The product cavity is connected to the sprue cavity (2022). The slider insert (203) and the rear mold core (201) together constitute the undercut structure (220) on the outer side of the product.
2. The injection mold with slider delay, anti-collision, and automatic separation of product sprue as described in claim 1, characterized in that: The push rod fixing plate (213) is also provided with a sprue ejector pin (215) and an anti-collision ejector pin (216). An anti-collision ejector pin through hole (2161) is provided between the slider seat (202) and the slider insert (203). The sprue ejector pin (215) passes through the rear mold core plate (206) and the rear mold core (201) and extends into the sprue material cavity (2022). When the sprue ejector pin (215) ejects the sprue material, the anti-collision ejector pin (216) passes through the rear mold core plate (206) and extends into the anti-collision ejector pin through hole (2161). A sprue pull ring (217) is nested on the rear mold core (201). The sprue pull ring (217) and the sprue ejector pin (215) are coaxially arranged.
3. The injection mold with slider delay, anti-collision, and automatic separation of product sprue as described in claim 2, characterized in that: The end of the sprue cavity (2022) is provided with a gate cavity, which is opened inside the slider insert (203) and is connected to the product cavity.
4. The injection mold with slider delay, anti-collision, and automatic separation of product sprue as described in claim 3, characterized in that: The front mold core plate (104) is provided with inclined guide post seats (103) on both sides of the front mold core (101). The inclined guide post (102) is positioned on the inclined guide post seat (103). An inclined surface is provided below the inclined guide post seat (103). The end of the slider seat (202) away from the slider insert (203) is provided with a contact inclined surface that matches the inclined surface of the inclined guide post seat (103). A first slider wear plate (207) is connected to the contact inclined surface.
5. The injection mold with slider delay, anti-collision, and automatic separation of product sprue as described in claim 4, characterized in that: The rear mold core plate (206) is provided with a second slider wear-resistant plate (205) at the bottom of the slider seat (202). The rear mold core plate (206) is provided with slider pressure strips (204) on both sides of the slider seat (202). The slider seat (202) is provided with lugs on both sides. The lugs are located between the second slider wear-resistant plate (205) and the slider pressure strips (204). The rear mold core plate (206) is also provided with a third slider wear-resistant plate (208), which is located in the middle of the slider seat (202).
6. The injection mold with slider delay, anti-collision, and automatic separation of product sprue as described in claim 5, characterized in that: The second slider wear plate (205) is provided with an elastic limiting clip (218) in the middle, and the second slider wear plate (205) is provided with a limiting bolt (219) on the side away from the slider insert (203). The bottom surface of the slider seat (202) is provided with a V-shaped clearance groove on both the side close to and away from the slider insert (203).