Runner-free injection mold for external thread assembly of medical drainage bag

Abstract

The utility model discloses a medical drainage bag external thread assembly non-runner injection mold, which comprises a front mold and a rear mold, the front mold comprises a fixed mold seat plate, a hot runner mounting plate, a front mold core plate and a front mold core which are sequentially laminated, and the bottom of the front mold core plate is provided with an inclined guide pillar and a wedge block on the side edge of the front mold core. A needle valve type hot runner mechanism is arranged in the hot runner mounting plate, the rear mold comprises a movable mold base plate, an ejector pin plate, a rear mold core plate and a rear mold core which are sequentially arranged in a laminated mode, a sliding block base is arranged above the rear mold core plate and located on the side edge of the rear mold core in a sliding mode, and an inclined guide hole penetrating up and down is formed in the sliding block base; the side, away from the inclined face, of the sliding block base is connected with a sliding block insert, and a sliding block round insert is arranged on the sliding block insert in an embedded mode. According to the scheme, glue is fed through the needle valve type hot runner system, runner congelation is avoided, the raw material utilization rate is increased, and the raw material cost is saved.

Description

Technical Field

[0001] This utility model belongs to the field of mold technology, specifically relating to a flow channelless injection mold for an external threaded assembly of a medical drainage bag. Background Technology

[0002] The external threaded component of the medical drainage bag is made of medical-grade ABS. It has eight cavities per mold and weighs about 1g. Currently, it is produced by cold runner injection molding. The product is arranged vertically in the mold, with a submarine gate for injection. The gate is located on the side of the product. The demolding method is ejection by push tube. The molding cycle is about 18 seconds, and about 7g of runner material is produced per mold.

[0003] However, when using cold runner injection molding, additional runners are needed to guide the plastic into the mold cavity, resulting in waste material after cooling. Each mold produces approximately 8g of finished product, with about 7g of solidified runner material generated, leading to low raw material utilization and significant waste. Furthermore, the longer cooling and solidification time for both the product and the runner material results in longer cycle times and lower production efficiency. The additional runner waste also increases mold maintenance costs and affects production continuity. Utility Model Content

[0004] To address the aforementioned problems, this utility model provides a flow-free injection mold for a medical drainage bag external thread assembly, comprising 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 bottom of the front mold core plate, located on the side of the front mold core, is provided with an inclined guide post and a wedge block. The hot runner mounting plate has a needle valve type hot runner mechanism inside. The rear mold includes a moving mold base plate, an ejector plate, a rear mold core plate, and a rear mold core, stacked sequentially. A slider seat is slidably mounted on the upper part of the rear mold core plate, located on the side of the rear mold core. The slider seat has an inclined guide hole that runs vertically through it. The slider seat slides against the inclined guide post through the inclined guide hole. The slider seat also has an inclined surface that abuts against the wedge block. A slider insert is connected to the side of the slider seat away from the inclined surface. A slider circular insert is nested on the slider insert. After the front mold core, rear mold core, and slider circular insert are molded together, a product cavity is formed.

[0005] Preferably, the needle valve type hot runner mechanism includes a main nozzle, a manifold plate, and a sub-nozzle. The main nozzle, the manifold plate, and the sub-nozzle are all provided with heating and temperature control elements and interconnected melt channels. A cylinder is provided in the fixed mold base plate above the sub-nozzle. The output end of the cylinder is connected to a valve needle, which extends through the manifold plate into the sub-nozzle.

[0006] Preferably, the bottom of the front mold core plate is screwed with an inclined guide post seat, the inclined guide post is fixed on the inclined guide post seat, and the wedge block is provided with a first slider wear-resistant plate on the side near the slider seat.

[0007] Preferably, the rear mold core plate is provided with slider pressure strips on both sides of the sliding seat, and the rear mold core plate is provided with a second slider wear-resistant plate below the sliding seat.

[0008] Preferably, a stroke cavity is provided between the moving mold base plate and the rear mold core plate for the ejector plate to move toward or away from the rear mold core, a limiting clamp is provided in the middle of the second slider wear plate, and clearance grooves that cooperate with the limiting clamp are provided on both sides of the bottom surface of the slider base, and a limiting bolt is provided on the side of the second slider wear plate away from the product cavity.

[0009] Preferably, the side of the wedge block closest to the slider seat is also an inclined surface.

[0010] The advantages of this utility model are:

[0011] 1. This solution adopts a needle valve hot runner system, which eliminates the runner waste generated in traditional cold runners, greatly improving the raw material utilization rate of each mold product. At the same time, since the hot runner can maintain the constant temperature of the molten plastic, there is no need to wait for the runner solidified material to cool down, thereby shortening the molding cycle and improving production efficiency.

[0012] 2. This solution employs structural designs such as inclined guide pillars, wedge blocks, slider seats, and slider inserts to enable precise positioning and formation of the internal hole structure through mechanical actions during mold closing and opening, thus ensuring the formation of complex product structures and smooth demolding.

[0013] 3. In this design, a first wear-resistant plate is provided on the side of the wedge block near the slider seat, and a second wear-resistant plate is provided on the rear mold core plate. These wear-resistant plates effectively reduce friction loss and extend the service life of key sliding components. Attached Figure Description

[0014] Figure 1 This is a structural diagram of the present utility model.

[0015] Figure 2 This is a schematic diagram of the needle valve type hot runner mechanism of this utility model.

[0016] Figure 3 This is a cross-sectional structural diagram of the present invention.

[0017] Figure 4 This is a three-dimensional structural diagram of the slider seat of this utility model.

[0018] Figure 5 This is a side view of the slider seat of this utility model.

[0019] Figure 6 This is a cross-sectional structural diagram of the slider seat of this utility model.

[0020] In the figure: front mold 10, rear mold 20, front mold core 101, inclined guide post 102, wedge block 103, first slider wear plate 104, inclined guide post seat 105, front mold core plate 106, fixed mold base plate 107, hot runner mounting plate 108, needle valve type hot runner system 109, rear mold core 201, slider seat 202, slider round insert 203, slider pressure strip 204, second slider wear plate 205, rear mold core plate 206, slider insert 207, moving mold base plate 208, ejector plate 209, limit clamp 210, limit bolt 211, main nozzle 1091, flow divider plate 1092, branch nozzle 1093, cylinder 1094, clearance groove 2101. Detailed Implementation

[0021] 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.

[0022] 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.

[0023] 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.

[0024] Example 1, such as Figure 1-2As shown, a flow channelless injection mold for a medical drainage bag external thread assembly 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 106, and a front mold core 101 stacked in sequence. The hot runner mounting plate 108 is provided with a needle valve type hot runner mechanism 109. During the process of molten plastic being injected from the injection molding machine nozzle until it flows into the mold cavity, the temperature is controlled by the needle valve type hot runner mechanism 109, so that the molten plastic always maintains a constant temperature and a molten state, and no flow channel solidification is generated.

[0025] Combination Figure 3 The needle valve type hot runner mechanism 109 includes a main nozzle 1091, a manifold 1092, and a branch nozzle 1093. Each of the main nozzle 1091, manifold 1092, and branch nozzle 1093 has a heating and temperature control element and interconnected melt channels. The branch nozzle 1093 extends below the front mold core plate 106 to the front mold core 101. A cylinder 1094 is located above the branch nozzle 1093 in the fixed mold base plate 107. The output end of the cylinder 1094 is connected to a valve needle 1095. The valve needle 1095 extends through the corresponding manifold 1092 to the branch nozzle 1093, reaching the gate, controlling the opening and closing of the gate. The main nozzle 1091 contacts the injection molding machine nozzle ball head, and the melt flows through the main nozzle 1091, manifold 1092, and branch nozzle 1093 into the product cavity. The number of nozzles 1093, cylinders 1094 and valve needles 1095 in the needle valve hot runner mechanism 109 is usually set to multiple, matching the number of cavity gates, and multiple cavity gates can be opened and closed at the same time.

[0026] Combination Figure 2 The bottom of the front mold core plate 106 is provided with a slanted guide post 102 and a wedge block 103 on the side of the front mold core 101. The bottom of the front mold core plate 106 is screwed with a slanted guide post seat 105, and the slanted guide post 102 is fixed on the slanted guide post seat 105.

[0027] The rear mold 20 includes a moving mold base plate 208, an ejector plate 209, a rear mold core plate 206, and a rear mold core 201, which are stacked in sequence. A slider seat 202 is slidably mounted above the rear mold core plate 206 on the side of the rear mold core 201. The slider seat 202 has a through-hole oblique guide hole, and the slider seat 202 slides with the oblique guide post 102 through the oblique guide hole. The slider seat 202 also has an oblique surface that abuts against the wedge block 103. The rear mold core plate 206 also has a groove to accommodate the oblique guide post 102.

[0028] When the front mold 10 and the rear mold 20 are closed, the front mold 10 is fixed, and the rear mold 20 moves towards the front mold 10. The inclined guide post 102 passes through the inclined guide hole and enters the groove on the rear mold core plate 206. At the same time, the wedge block 103 abuts against the inclined surface of the slider seat 202, causing the slider seat 202 to move towards the rear mold core 201. A slider insert 207 is connected to the side of the slider seat 202 away from the inclined surface. A slider round insert 203 is nested on the slider insert 207. After the front mold core 101, the rear mold core 201, and the slider round insert 203 are closed, a product cavity is formed.

[0029] The wedge block 103 preferably has an inclined surface on the side near the slider seat 202. A first slider wear-resistant plate 104 is provided on the side of the wedge block 103 near the slider seat 202. Slider pressure strips 204 are provided on both sides of the slider seat on the rear mold core plate 206, and a second slider wear-resistant plate 205 is provided on the rear mold core plate 206 below the slider seat. The slider pressure strips 204 and the second slider wear-resistant plate 205 are bolted to the rear mold core plate 206. The slider pressure strips 204 limit the movement of both sides of the slider seat 202. Lugs are provided on both sides of the slider seat 202, and grooves are provided on the opposite sides of the slider pressure strips 204. The lugs slide within the grooves to further ensure sliding stability. The first slider wear-resistant plate 104 and the second slider wear-resistant plate 205 effectively reduce friction loss and extend the service life of key sliding components. Through the above design measures, this solution can effectively prevent displacement or jitter during the movement of the slider, ensuring the stability of the mold during mold closing, mold opening and demolding, thereby improving the precision and quality of product molding.

[0030] Combination Figure 4-6 A travel cavity is provided between the moving mold base plate 208 and the rear mold core plate 206 for the ejector plate 209 to move toward or away from the rear mold core 201. A limiting clamp 210 is provided in the middle of the second slider wear plate 205, and a limiting bolt 211 is provided on the side of the second slider wear plate 205 away from the product cavity. Both the limiting clamp 210 and the limiting bolt 211 are bolted to the rear mold core plate 206. The bottom surface of the slider seat 202 is provided with V-shaped clearance grooves 2101 on both sides near and away from the slider insert 207. The stroke range of the slider seat 202 is between the two V-shaped clearance grooves 2101. The top surface of the limiting clamp 210 includes 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 limiting clamp 210, 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 2101, the spring compression force of the limiting clamp 210 is released, and the V-shaped protrusion and the V-shaped clearance groove 2101 cooperate to limit the movement of the slider seat towards or away from the cavity of the rear mold core 201. The limiting bolt 211 is used to further prevent the slider seat 202 from moving outward.

[0031] The actions of mold closing and mold opening serve as the power source, driving the sliding engagement between the inclined guide post 102 and the slider seat 202, thereby driving the wedge block 103 and the slider seat 202 to push or separate. During the mold closing process of the front mold 10 and the rear mold 20, the inclined guide post 102 enters the inclined guide hole of the slider seat 202, and the inclined surface of the first slider wear plate 104 on the wedge block 103 pushes against the inclined surface of the slider seat 202, pushing the slider round insert 203 towards the product cavity. Thus, when the mold closing is completed, the front mold core 101, the rear mold core 201 and the slider round insert 203 form a complete product cavity. The part of the slider round insert 203 located in the product cavity can form the inner hole structure of the product.

[0032] During injection molding, molten plastic is guided and transported to the product cavity by the needle valve-type hot runner mechanism 109. After filling, the gates of each cavity are closed by the needle valve, and the product is left to cool and solidify in the mold. During the mold separation process between the front mold 10 and the rear mold 20, the inclined guide post 102 moves away from the inclined guide hole of the slider seat 202, the inclined surface of the first slider wear plate 104 on the wedge block 103 separates from the inclined surface of the slider seat 202, and the slider round insert 203 moves away from the product cavity. After the front mold 10 and the rear mold 20 are completely separated and the slider round insert 203 is completely away from the product cavity, the product remains in the cavity of the rear mold core 201. The ejector plate 209 moves towards the rear mold core 201, and the ejector pins achieve the purpose of ejecting and demolding the product.

[0033] 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. A channelless injection mold for an external threaded assembly of a medical drainage bag, 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 (106), and a front mold core (101) stacked in sequence. The bottom of the front mold core plate (106) is provided with a slanted guide post (102) and a wedge block (103) on the side of the front mold core (101). The hot runner mounting plate (108) is provided with a needle valve type hot runner mechanism (109) inside. The rear mold (20) includes a moving mold base plate (208), an ejector plate (209), a rear mold core plate (206), and a rear mold core (201) stacked in sequence. A slider seat (202) is slidably provided above the rear mold core (201) on the side. The slider seat (202) is provided with a through-hole. The slider seat (202) is slidably engaged with the inclined guide post (102) through the through-hole. The slider seat (202) is also provided with an inclined surface that abuts against the wedge block (103). A slider insert (207) is connected to the side of the slider seat (202) away from the inclined surface. A slider round insert (203) is nested on the slider insert (207). After the front mold core (101), the rear mold core (201) and the slider round insert (203) are closed, a product cavity is formed.

2. The channelless injection mold for the external thread assembly of the medical drainage bag according to claim 1, characterized in that: The needle valve type hot runner mechanism (109) includes a main nozzle (1091), a manifold (1092) and a sub-nozzle (1093). The main nozzle (1091), the manifold (1092) and the sub-nozzle (1093) are all equipped with heating and temperature control elements and interconnected melting channels. A cylinder (1094) is provided in the fixed mold base plate (107) above the sub-nozzle (1093). The output end of the cylinder (1094) is connected to a valve needle (1095). The valve needle (1095) extends through the manifold (1092) into the sub-nozzle (1093).

3. The flow-channel-free injection mold for the external thread assembly of the medical drainage bag according to claim 2, characterized in that: The bottom of the front mold core plate (106) is screwed with an inclined guide post seat (105), the inclined guide post (102) is fixed on the inclined guide post seat (105), and the wedge block (103) is provided with a first slider wear plate (104) on the side near the slider seat (202).

4. The flow-channel-free injection mold for the external thread assembly of the medical drainage bag according to claim 3, characterized in that: The rear mold core plate (206) is provided with slider pressure strips (204) on both sides of the sliding seat, and the rear mold core plate (206) is provided with a second slider wear-resistant plate (205) below the sliding seat.

5. The flow-channel-free injection mold for the external thread assembly of the medical drainage bag according to claim 4, characterized in that: A travel cavity is provided between the moving mold base plate (208) and the rear mold core plate (206) for the ejector plate (209) to move toward or away from the rear mold core (201). A limiting clamp (210) is provided in the middle of the second slider wear plate (205). A clearance groove (2101) is provided on both sides of the bottom surface of the slider seat (202). A limiting bolt (211) is provided on the side of the second slider wear plate (205) away from the product cavity.

6. The flow-channel-free injection mold for the external thread assembly of the medical drainage bag according to claim 5, characterized in that: The side of the wedge block (103) near the slider seat (202) is also an inclined surface.

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