Injection molding device

Abstract

The present invention relates to the field of mold technology, and specifically to an injection molding device, comprising a mold body and an injection mechanism, the injection mechanism comprising a flexible material pipe and a closing component arranged outside the material pipe, the material pipe is used to transport the material liquid of the injection mechanism to the mold body, and the closing component is used to close or open the material pipe; an overflow component connected to the mold body is provided at the end of the material pipe, the overflow component comprises an overflow seat and an overflow nozzle elastically connected to the overflow seat, an overflow pipe is provided inside the overflow seat and the overflow nozzle, and the overflow pipe is connected to the material pipe, the overflow nozzle can be selectively crimped to the mold body, and the overflow nozzle forms a relatively sliding connection relationship with the overflow seat through elastic connection and selective crimping to the mold body, thereby adjusting the length of the overflow pipe by means of the relative sliding between the overflow nozzle and the overflow seat, and preventing the material liquid from overflowing by means of the increase in the length of the overflow pipe.

Description

Technical Field

[0001] The present invention relates to the technical field of molds, in particular to an injection molding device. Background Art

[0002] During injection molding, the molten liquid is typically subjected to a positive pressure higher than atmospheric pressure to ensure it can flow smoothly through the feed pipe and into the mold. After injection molding is complete, although the feed port is closed, a certain amount of liquid remains in the pipe. The nozzle at the end of the pipe is separated from the mold's feed port. Therefore, the positively pressurized liquid can overflow from the nozzle due to the pressure differential, resulting in waste and contamination of the nozzle. Summary of the Invention

[0003] The object of the present invention is to provide an injection molding device to solve the above-mentioned problem of liquid overflow.

[0004] To achieve the above-mentioned purpose, the technical solution of the present invention is as follows: an injection molding device comprises a mold body and an injection mechanism, the injection mechanism comprises a flexible material tube and a closing component arranged outside the material tube, the material tube is used to transport the material liquid of the injection mechanism to the mold body, and the closing component is used to close or open the material tube; an overflow component connected to the mold body is provided at the end of the material tube, the overflow component comprises an overflow seat and an overflow nozzle elastically connected to the overflow seat, an overflow pipe is provided inside the overflow seat and the overflow nozzle, and the overflow pipe is connected to the material tube, the overflow nozzle can be selectively crimped to the mold body, and the overflow nozzle forms a relatively sliding connection relationship with the overflow seat by elastic connection and selective crimping to the mold body, so that the length of the overflow pipe is adjusted by means of the relative sliding between the overflow nozzle and the overflow seat, and the overflow of the material liquid is prevented by means of the increase in the length of the overflow pipe;

[0005] During injection molding, the mold body and the injection mechanism are close to squeeze the overflow nozzle, so that the overflow nozzle and the overflow seat are close to each other and the overflow pipe is shortened, so that the liquid material enters the mold body along the overflow nozzle; after the injection molding is completed, the mold body and the injection mechanism are separated from each other to release the overflow nozzle, and the overflow nozzle is separated from the overflow seat under the action of the elastic connection and the overflow pipe is extended, so that the extended part of the overflow pipe is used to accommodate the liquid material to reduce the pressure of the liquid material, thereby preventing the liquid material from overflowing.

[0006] In one embodiment, the material closing assembly includes a first material closing structure and a second material closing structure that are connected and move relative to each other. The first material closing structure and the second material closing structure are respectively located on two opposite sides of the material pipe in the radial direction. The material pipe is clamped by the relative movement of the first material closing structure and the second material closing structure to achieve the closing or opening of the material pipe.

[0007] In one embodiment, the material pipe is inserted into a closed material sleeve, and a closed material pusher is provided on one side of the closed material sleeve, which moves relative to the closed material sleeve. The closed material pusher forms the first closed material structure, and an inner wall of the closed material sleeve forms the second closed material structure, and the inner wall is arranged relative to the closed material pusher.

[0008] In one embodiment, a first connecting part is provided at the end of the overflow seat, and a second connecting part is provided at the overflow nozzle. The second connecting part is sleeved in the first connecting part, and a first step is provided at the end of the first connecting part. A spring is provided between the first step and the end face of the second connecting part, thereby forming an elastic connection of the overflow nozzle relative to the overflow seat.

[0009] In one embodiment, the overflow nozzle includes a metal pressing piece and a rubber head, the second connecting portion is formed on the metal pressing piece, and the rubber head is arranged at an end of the metal pressing piece away from the overflow seat, so that the rubber head can be selectively crimped to the mold body.

[0010] In one embodiment, a second step is provided on the inner side of the metal pressing piece, and the rubber head abuts against the second step, so that the second step forms an installation limit for the rubber head.

[0011] In one embodiment, the injection mechanism also includes a feeding seat connected to the overflow assembly, a feeding pipe is provided in the feeding seat, one end of the feeding pipe is connected to the material pipe, and the other end is connected to the overflow pipe, and the feeding seat is connected to the mold body for relative movement, thereby driving the overflow assembly to move relative to the mold body to squeeze or release the overflow nozzle to adjust the length of the overflow pipe.

[0012] In one embodiment, the mold body includes a movable mold and a fixed mold, the fixed mold is provided with a feed port, the overflow nozzle of the overflow assembly is connected to the feed port, and when the movable mold and the fixed mold are separated, the overflow nozzle leaves the feed port to release the overflow nozzle, thereby extending the overflow pipe.

[0013] In one embodiment, the feed pipe is provided with two outlets, each of the outlets is connected to one of the overflow components.

[0014] The beneficial effects of the present invention are:

[0015] 1. The present invention provides a closing component and an overflow component on the material pipe. The combination of the two can cut off the material liquid in time and prevent the material liquid from overflowing at the end of injection molding. When injection molding is completed, the closing component can close the material pipe to stop feeding the material to the mold body. The elastic connection between the overflow seat and the overflow nozzle enables the overflow nozzle to move away from the overflow seat when released, thereby automatically extending the length of the overflow channel. The material liquid between the closing component and the overflow nozzle has a tendency to overflow due to pressure. The extended overflow pipe can accommodate the material liquid, thereby preventing the material liquid from overflowing outside the injection mechanism.

[0016] 2. The closing component is a movable mechanism, and the flexible material tube is easy to deform. Through simple actions, the material tube can be closed or opened as needed to control the flow of material and liquid, and the control difficulty is low.

[0017] 3. During injection molding, one end of the overflow pipe is connected to the feed pipe, and the other end is connected to the feed port of the mold body. At this time, the overflow pipe plays the role of feeding. When the overflow nozzle leaves the feed port after the injection molding is completed, the overflow pipe is extended to accommodate the overflow of the liquid. During the next injection molding, the liquid in the overflow pipe can be supplied to the mold body again, reducing the waste of liquid and keeping the mold body and injection mechanism clean. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a perspective view of an embodiment of the present invention.

[0019] Figure 2 It is a top view of an embodiment of the present invention without a material box.

[0020] Figure 3 yes Figure 2 CC cross-sectional view.

[0021] Figure 4 Schematic diagram of the overflow pipe of the overflow assembly in a shortened state according to an embodiment of the present invention.

[0022] Figure 5 It is a schematic diagram of the overflow pipe of the overflow assembly in an embodiment of the present invention in an extended state.

[0023] Figure 6 It is a schematic three-dimensional diagram of the release tube state of the material closing assembly according to an embodiment of the present invention.

[0024] Figure 7 It is a schematic top view of the release tube state of the closing assembly according to an embodiment of the present invention.

[0025] Figure 8 It is a schematic three-dimensional diagram of the clamping state of the material closing assembly according to an embodiment of the present invention.

[0026] Figure 9 It is a schematic top view of the clamping state of the material tube of the material closing assembly according to an embodiment of the present invention.

[0027] Among them: 1 mold body, 11 movable mold, 12 fixed mold, 121 feed port, 2 injection mechanism, 21 material pipe, 22 closing assembly, 221 closing sleeve, 222 closing pusher, 223 cylinder, 23 overflow assembly, 231 overflow seat, 2311 first connecting part, 2312 first step, 232 overflow nozzle, 2321 second connecting part, 233 spring, 234 metal pressing part, 2341 second step, 235 rubber head, 24 feeding seat, 25 right-angle connecting pipe, 3 material box. DETAILED DESCRIPTION

[0028] To further illustrate various embodiments, the present invention is provided with accompanying drawings. These drawings form part of the present disclosure and are primarily used to illustrate the embodiments and, in conjunction with the relevant description in the specification, to explain the operating principles of the embodiments. By referring to these drawings, one of ordinary skill in the art will understand other possible embodiments and the advantages of the present invention. The components in the figures are not drawn to scale, and similar reference numerals are generally used to represent similar components.

[0029] See Figures 1 to 9 As shown, the present invention discloses an injection molding device, including a mold body 1 and an injection mechanism 2. The mold body 1 includes a movable mold 11 and a fixed mold 12. The fixed mold 12 is provided with a feed port 121. A cavity is also provided between the movable mold 11 and the fixed mold 12, and the feed port 121 is connected to the cavity through a runner in the mold. The molten liquid from the injection mechanism 2 enters the cavity through the feed port 121 and the runner for cooling and molding.

[0030] The injection mechanism 2 includes a flexible material tube 21 and a closing assembly 22 disposed outside the material tube 21. The material tube 21 is used to transport the material liquid from the injection mechanism 2 to the mold body 1, and the closing assembly 22 is used to close or open the material tube 21. An overflow assembly 23 connected to the mold body 1 is provided at the end of the material tube 21. The overflow assembly 23 includes an overflow seat 231 and an overflow nozzle 232 elastically connected to the overflow seat 231. The overflow nozzle 232 can be selectively crimped to the mold body 1, more specifically, it can be selectively connected to or away from the feed port 121 of the mold body 1. An overflow channel A is provided within the overflow seat 231 and the overflow nozzle 232, and the overflow channel A is connected to the material tube 21, so that the material liquid in the material tube 21 enters the feed port 121 of the mold body through the overflow channel A. The overflow nozzle 232 is elastically connected and optionally crimped to the mold body 1 to form a relatively sliding connection with the overflow seat 231, thereby adjusting the length of the overflow pipe A by means of the relative sliding between the overflow nozzle 232 and the overflow seat 231, and preventing the overflow of the liquid by means of the increase in the length of the overflow pipe A.

[0031] During injection molding, the mold body 1 and the injection mechanism 2 are close to the extrusion overflow nozzle 232, so that the overflow nozzle 232 and the overflow seat 231 are close to shorten the overflow channel A ( Figure 4 ), so that the material liquid enters the mold body 1 along the overflow nozzle 232; after the injection molding is completed, the mold body 1 and the injection mechanism 2 are separated to release the overflow nozzle 232, and the overflow nozzle 232 is separated from the overflow seat 231 under the action of the elastic connection and extends the overflow channel A ( Figure 5 ), so that the extended part of the overflow pipe A is used to accommodate the feed liquid to reduce the pressure of the feed liquid, thereby preventing the feed liquid from overflowing.

[0032] See Figure 4 and Figure 5 As shown, the overflow seat 231 has a first connecting portion 2311 at its distal end, and the overflow nozzle 232 has a second connecting portion 2321. The second connecting portion 2321 is sleeved within the first connecting portion 2311. A first step 2312 is provided at the distal end of the first connecting portion 2311. A spring 233 is disposed between the first step 2312 and the end surface of the second connecting portion 2321, thereby elastically connecting the overflow nozzle 232 to the overflow seat 231. The first connecting portion 2311 and the second connecting portion 2321 form an axial connection between the overflow seat 231 and the overflow nozzle 232, with their relative motion direction parallel to the axial direction of the overflow nozzle 232. The spring 233, in conjunction with the fixed mold 12 axially disposed in the overflow nozzle 232's direction, enables movement of the overflow nozzle 232 relative to the overflow seat 231. To prevent liquid from leaking through the gap between the first connecting portion 2311 and the second connecting portion 2321, a sealing rubber is disposed between the first connecting portion 2311 and the second connecting portion 2321.

[0033] The overflow nozzle 232 comprises a metal pressing piece 234 and a rubber head 235. A second connection portion 2321 is formed on the metal pressing piece 234, and the rubber head 235 is located at the end of the metal pressing piece 234 away from the overflow seat 231, allowing the rubber head 235 to selectively connect to the mold body 1. A second step 2341 is provided on the inner side of the metal pressing piece 234, against which the rubber head 235 abuts, thereby forming a mounting stop for the rubber head 235 and ensuring the accuracy of the overflow nozzle 232. The rubber head 235, made of rubber, directly contacts the mold body 1. Its relatively soft texture ensures a seal between the overflow nozzle 232 and the feed port 121, preventing liquid leakage during the injection molding process. The portion abutting the overflow seat 231 is made of the metal pressing piece 234, which utilizes its hardness to fully compress the spring 233, ensuring that the overflow channel A is fully contracted and leaving space for the overflow channel A to extend.

[0034] See Figure 1 and Figure 3As shown, the injection mechanism 2 further includes a feed base 24 connected to the overflow assembly 23. A feed conduit B is disposed within the feed base 24. One end of the feed conduit B is connected to the material pipe 21, and the other end is connected to the overflow conduit A. The feed base 24 is connected to the mold body 1 for relative movement, thereby driving the overflow assembly 23 to move relative to the mold body 1 to squeeze or release the overflow nozzle 232 to adjust the length of the overflow conduit A. The movement mechanism of the feed base 24 is not shown in the figure. The movement of the feed base 24 is linked to the opening and closing of the mold body 1. When the movable mold 11 and the fixed mold 12 are separated (i.e., the mold body 1 is opened), the feed base 24 drives the overflow nozzle 232 away from the feed port 121 to release the overflow nozzle 232, thereby extending the overflow conduit A. When the movable mold 11 and the fixed mold 12 are closed (i.e., the mold body 1 is closed), the feed base 24 drives the overflow nozzle 232 to abut against the feed port 121 to squeeze the overflow nozzle 232, thereby shortening the overflow conduit A.

[0035] In this example, the feed pipe B has two outlets B1, each outlet B1 is connected to an overflow assembly 23, and the two sets of overflow assemblies 23 move synchronously with the feed base 24. In other embodiments, depending on the structure of the mold body 1, the feed pipe B may have only one or more outlets B1, and accordingly, the overflow assemblies 23 may be one or more sets.

[0036] See Figures 6 to 9 As shown, the material closing assembly 22 comprises a first material closing structure and a second material closing structure that are connected and movable relative to each other. The first and second material closing structures are located on opposite radial sides of a material pipe 21 (represented by dashed lines in the figure). The relative movement of the first and second material closing structures clamps the material pipe 21 to close or open the material pipe 21. In this example, the material pipe 21 is disposed within a material closing sleeve 221. A material closing pusher 222 is provided on one side of the material closing sleeve 221, which moves relative to the sleeve 221. The material closing pusher 222 forms the first material closing structure, while an inner wall of the sleeve 221 forms the second material closing structure, and the inner wall is disposed opposite the material closing pusher 222. The material closing pusher 222 is connected to the end of a cylinder 223. The cylinder 223 is extended or retracted to control the material closing pusher 222 to move closer to or farther from the inner wall of the sleeve 221, thereby clamping or releasing the material pipe 21. In other embodiments, the first material closing structure and the second material closing structure may be a pusher respectively, the material tube 21 is arranged between the two pushers, and the two pushers or one of the pushers are driven by a cylinder.

[0037] See Figures 1 to 9As shown, one end of the feed pipe 21 is connected to the feed base 24 via a right-angle connecting pipe 25, and the other end is connected to the feed bin 3, thereby supplying the liquid in the feed bin 3 to the mold body. The feed pipe 21 is configured as a flexible tube and is easily deformed. When the closing pusher 222 approaches the inner wall of the closing sleeve 221, which forms the second closing structure, the closing pusher 222 flattens the feed pipe 21, thereby cutting off the liquid supply between the feed bin 3 and the mold body 1. When the closing pusher 222 moves away from the inner wall of the closing sleeve 221, which forms the second closing structure, the feed pipe 21 recovers, reconnecting the liquid supply between the feed bin 3 and the mold body 1. After the feed pipe 21 is closed by the closing assembly 22, the liquid still has a certain pressure, and the overflow nozzle 232 is now away from the feed inlet 121, the overflow conduit A is extended, and the liquid is stored in the extended overflow conduit A, reducing the pressure until it equals the external pressure, preventing the liquid from overflowing.

[0038] Although the present invention has been specifically shown and described in conjunction with the preferred embodiments, it should be understood by those skilled in the art that the remaining undescribed portions are prior art, and that various changes in form and details made to the present invention without departing from the spirit and scope of the present invention as defined by the appended claims fall within the scope of protection of the present invention.

Claims

1. An injection molding device, comprising a mold body and an injection mechanism, characterized in that: The injection mechanism includes a flexible material tube and a closing component arranged outside the material tube, the material tube is used to transport the material liquid of the injection mechanism to the mold body, and the closing component is used to close or open the material tube; the end of the material tube is provided with an overflow component connected to the mold body, the overflow component includes an overflow seat and an overflow nozzle elastically connected to the overflow seat, an overflow pipe is provided inside the overflow seat and the overflow nozzle, and the overflow pipe is connected to the material tube, the overflow nozzle is used to be crimped to the mold body, and the overflow nozzle forms a relatively sliding connection relationship with the overflow seat through the elastic connection and its use for crimping to the mold body, so that the length of the overflow pipe is adjusted by means of the relative sliding between the overflow nozzle and the overflow seat, and the overflow of the material liquid is prevented by the increase in the length of the overflow pipe; The material closing assembly includes a first material closing structure and a second material closing structure that are connected and move relative to each other. The first material closing structure and the second material closing structure are respectively located on two opposite sides of the material pipe in the radial direction. The material pipe is clamped by the relative movement of the first material closing structure and the second material closing structure to close or open the material pipe. The material pipe is inserted into a material closing sleeve, and a material closing pusher is provided on one side of the material closing sleeve and moves relative to the material closing sleeve. The material closing pusher forms the first material closing structure, and an inner wall of the material closing sleeve forms the second material closing structure, and the inner wall is arranged relative to the material closing pusher. The end of the overflow seat is provided with a first connecting portion, and the overflow nozzle is provided with a second connecting portion, the second connecting portion is sleeved in the first connecting portion, and the end of the first connecting portion is provided with a first step, and a spring is provided between the first step and the end surface of the second connecting portion, thereby forming an elastic connection between the overflow nozzle and the overflow seat; During injection molding, the mold body and the injection mechanism are close to each other to squeeze the overflow nozzle, and the overflow nozzle is connected to the feed port of the mold body, so that the overflow nozzle and the overflow seat are close to each other and the overflow pipe is shortened, so that the liquid enters the mold body along the overflow nozzle; after the injection molding is completed, the mold body and the injection mechanism are separated from each other to release the overflow nozzle, and the overflow nozzle is separated from the feed port of the mold body. Under the action of the spring, the overflow nozzle is separated from the overflow seat and the overflow pipe is extended, so that the extended part of the overflow pipe and the gap of the extended spring are used to accommodate the liquid to reduce the pressure of the liquid, thereby preventing the liquid from overflowing.

2. An injection molding device according to claim 1, characterized in that: The overflow nozzle includes a metal pressing piece and a rubber head, the metal pressing piece is formed with the second connecting portion, and the rubber head is arranged at one end of the metal pressing piece away from the overflow seat, so that the rubber head is used to be crimped to the mold body.

3. An injection molding device according to claim 2, characterized in that: A second step is provided on the inner side of the metal pressing piece, and the rubber head abuts against the second step, so that the second step forms an installation limit for the rubber head.

4. The injection molding device according to claim 1, characterized in that: The injection mechanism also includes a feeding seat connected to the overflow component, a feeding pipe is provided in the feeding seat, one end of the feeding pipe is connected to the material pipe, and the other end is connected to the overflow pipe, and the feeding seat is connected to the mold body for relative movement, thereby driving the overflow component to move relative to the mold body to squeeze or release the overflow nozzle to adjust the length of the overflow pipe.

5. The injection molding device according to claim 4, characterized in that: The mold body includes a movable mold and a fixed mold. The fixed mold is provided with a feed port. The overflow nozzle of the overflow assembly is connected to the feed port. When the movable mold and the fixed mold are separated, the overflow nozzle leaves the feed port to release the overflow nozzle, thereby extending the overflow pipe.

6. The injection molding device according to claim 4, characterized in that: The feed pipe is provided with two outlets, and each outlet is connected to one of the overflow components.

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