Die structure for solving glue overflow of LSR cold runner

Abstract

The utility model provides a mould structure for solving the problem of glue overflow of an LSR cold runner, which comprises a heat insulation plate, a fixed plate, a splitter plate and a fixed mould plate, a cylinder is arranged on the fixed plate, the splitter plate is provided with a mounting groove, a runner plate is arranged in the mounting groove, the runner plate comprises an upper runner plate and a lower runner plate, the fixed mould plate is provided with a nozzle sleeve, the lower runner plate is provided with an upper runner and a first runner hole, and the nozzle sleeve is provided with a second runner hole. The upper runner is communicated with the first runner hole, the bottom of the mounting groove is provided with a plurality of groups of second runner holes and lower runners, the lower runners are connected with the second runner holes, the fixed plate is provided with a glue inlet, the glue inlet is communicated with the upper runner, the air cylinder is provided with a valve needle, and the valve needle penetrates through the upper runner plate and penetrates through the nozzle sleeve from the second runner holes. Liquid silica gel enters the upper runner from the gel inlet, passes through the first runner hole to the lower runner, then passes through the second runner hole to the nozzle sleeve from the lower runner and finally enters the cavity, and a double-runner structure is adopted, so that on one hand, the runner area is reduced, the situation that the gel overflows from a gap during pressurization is avoided, on the other hand, the gel flows more evenly, and the problem of uneven filling is avoided.

Description

Technical Field

[0001] This utility model relates to the field of injection mold technology, specifically to a mold structure for solving the problem of overflow in LSR cold runners. Background Technology

[0002] Industrially, liquid silicone rubber (LSR) is mainly used for drying instruments, meters, and equipment. This type of LSR is generally inorganic silicone. As packaging LSR, it is widely used in precision instruments, leather, clothing, food, pharmaceuticals, and electrical appliances. Food-grade LSR can be used to make baby bottle nipples, medical products, and other food-grade products. LSR molds are a type of thermosetting plastic mold that uses liquid silicone as the molding material. The material is fed into a silicone injection molding machine through a dedicated mixing system, and then injected into a heated liquid silicone mold under a certain pressure and speed through the LSR cold runner system to form the product. Existing LSR cold runner systems have the following problems: 1. The runner plate and template are fixed with bolts, which cannot completely compress and fit together. Multi-cavity injection requires a large runner area, causing the material to easily overflow from gaps and template holes when the injection pressure increases; 2. Uneven material flow during multi-cavity injection leads to uneven product filling. Utility Model Content

[0003] This invention provides a mold structure to solve the problem of overflow in LSR cold runner systems, aiming to improve the problem of uneven filling caused by overflow and uneven flow in existing LSR cold runner systems.

[0004] This utility model is implemented as follows: A mold structure for solving the problem of LSR cold runner overflow includes a heat insulation plate, a fixed plate, a flow divider plate, and a fixed template arranged from top to bottom. A cylinder is installed on the fixed plate. The flow divider plate has an installation groove, and a runner plate is installed in the installation groove. The runner plate includes an upper runner plate and a lower runner plate. A nozzle sleeve is provided on the fixed template. The lower runner plate has an upper runner and several first runner holes. The upper runner is connected to the first runner holes. Several sets of second runner holes and a lower runner are opened at the bottom of the installation groove. The lower runner is connected to the second runner holes. The fixed plate has a glue inlet, which is connected to the upper runner. A valve needle is installed on the cylinder. The valve needle passes through the upper runner plate, through the second runner holes, and to the nozzle sleeve.

[0005] Furthermore, a sealing groove is provided around the upper flow channel and the lower flow channel, and a sealing ring is installed in the sealing groove.

[0006] Furthermore, two positioning posts are provided at the bottom of the mounting groove, and two positioning holes are opened in the flow channel plate, with the positioning posts corresponding to the positioning holes.

[0007] Furthermore, a timing control valve is installed on the side of the fixed template.

[0008] Furthermore, a partition is provided between the diverter plate and the fixed template.

[0009] The beneficial effects of this utility model are:

[0010] This utility model discloses a mold structure for solving the problem of LSR cold runner overflow, comprising a heat insulation plate, a fixed plate, a flow divider plate, and a fixed template. A cylinder is mounted on the fixed plate. The flow divider plate has an installation groove, and a runner plate is installed in the installation groove. The runner plate includes an upper runner plate and a lower runner plate. A nozzle sleeve is provided on the fixed template. The lower runner plate has an upper runner and several first runner holes, with the upper runner connecting to the first runner holes. Several sets of second runner holes and a lower runner are provided at the bottom of the installation groove, with the lower runner connecting to the second runner holes. The fixed plate has a glue inlet, which connects to the upper runner. A valve needle is mounted on the cylinder, and the valve needle passes through the upper runner plate, through the second runner holes, and to the nozzle sleeve. During injection molding, liquid silicone enters the upper runner from the injection port, passes through the first runner hole to the lower runner, and then passes through the second runner hole to the nozzle sleeve. The control cylinder drives the valve needle to rise, and the liquid silicone enters the mold cavity. This utility model adopts a dual runner structure with upper and lower runners. On the one hand, it reduces the area of ​​the runners and prevents the silicone from overflowing from the gaps when pressurized. On the other hand, the silicone flows more evenly, avoiding the problem of uneven filling of the product. Attached Figure Description

[0011] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this utility model and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained from these drawings without creative effort.

[0012] Figure 1 This is a schematic diagram of the overall mold structure for solving the problem of LSR cold runner overflow as described in this utility model;

[0013] Figure 2 This is a diagram of the internal structure of the manifold plate in the mold structure for solving the problem of LSR cold runner overflow as described in this utility model;

[0014] Figure 3 This is an exploded view of the manifold plate of the mold structure for solving the problem of LSR cold runner overflow as described in this utility model;

[0015] Figure 4 This is a diagram of the manifold structure of the mold structure for solving the problem of LSR cold runner overflow as described in this utility model;

[0016] Figure 5 This is a diagram of the lower runner plate structure of the mold structure for solving the problem of LSR cold runner overflow as described in this utility model;

[0017] Figure 6 This is a cross-sectional view of the mold structure for solving the problem of LSR cold runner overflow as described in this utility model.

[0018] Figure label:

[0019] 10. Heat insulation board; 101. Glue inlet;

[0020] 20. Fixing plate; 201. Cylinder; 2011. Valve needle;

[0021] 30. Diverter plate; 301. Mounting groove; 3011. Lower flow channel; 3012. Second flow channel hole; 3013. Positioning post; 302. Upper flow channel plate; 303. Lower flow channel plate; 3031. Upper flow channel; 3032. First flow channel hole; 304. Sealing groove; 305. Positioning hole;

[0022] 40. Partition;

[0023] 50. Fixed template; 501. Nozzle sleeve; 502. Timing control valve. Detailed Implementation

[0024] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this utility model, not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of this utility model without creative effort are within the scope of protection of this utility model. Therefore, the following detailed description of the embodiments of this utility model provided in the accompanying drawings is not intended to limit the scope of the claimed utility model, but merely represents selected embodiments of this utility model. All other embodiments obtained by those skilled in the art based on the embodiments of this utility model without creative effort are within the scope of protection of this utility model.

[0025] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0026] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0027] Please refer to Figure 1 As shown, this embodiment provides a mold structure for solving the problem of LSR cold runner overflow, including a heat insulation plate 10, a fixing plate 20, a flow divider plate 30 and a fixed template 50 arranged from top to bottom. The heat insulation plate 10, the fixing plate 20 and the flow divider plate 30 are assembled and installed on the fixed template 50 by bolts.

[0028] Please refer to Figure 2-5 As shown, the manifold 30 has a mounting groove 301, in which a flow channel plate is installed. The flow channel plate includes an upper flow channel plate 302 and a lower flow channel plate 303. The lower flow channel plate 303 has an upper flow channel 3031 and several first flow channel holes 3032. The upper flow channel 3031 connects to the first flow channel holes 3032. The bottom of the mounting groove 301 has several sets of second flow channel holes 3012 and a lower flow channel 3011. The lower flow channel 3011 connects to the second flow channel holes 3012. The fixing plate 20 is provided with an inlet 101, which connects to the upper flow channel plate 302. Specifically, liquid silicone enters the upper flow channel 3031 from the inlet 101. In this embodiment, the upper flow channel 3031 connects to four first flow channel holes 3032. The liquid silicone flows from the four first flow channel holes 3032 to the lower flow channel 3011. The lower flow channel 3011 includes four channels, each of which connects to two second flow channel holes 3012 at both ends. This double-layer flow channel structure design of the upper and lower flow channels 3031 reduces overflow caused by increased flow channel area due to multiple cavities. Furthermore, two positioning posts 3013 are provided at the bottom of the mounting groove 301. The flow channel plate has two positioning holes 305, with the positioning posts 3013 corresponding to the positioning holes 305. The upper flow channel plate 302 and the lower flow channel plate 303 have positioning holes 305 at the same position. The quick positioning and installation of the flow channel plate is achieved through the cooperation of the positioning posts 3013 and the positioning holes 305.

[0029] Please refer to Figure 2-5As shown, a sealing groove 304 is provided around the upper flow channel 3031 and the lower flow channel 3011, and a sealing ring is installed in the sealing groove 304. Specifically, when the upper flow channel plate 302 and the lower flow channel plate 303 are pressed together, the sealing ring around the upper flow channel 3031 is compressed to prevent the liquid silicone in the upper flow channel 3031 from overflowing; then the upper flow channel plate 302 and the lower flow channel plate 303 are locked in the mounting groove 301, and the lower flow channel plate 303 presses the sealing ring around the lower flow channel 3011 to prevent the liquid silicone in the lower flow channel 3011 from overflowing. The sealing ring further plays the role of sealing to prevent the liquid silicone from leaking.

[0030] Please refer to Figure 6 As shown, the fixed template 50 is equipped with a nozzle sleeve 501, and a cylinder 201 is installed on the fixed plate 20. A valve needle 2011 is installed on the cylinder 201. The valve needle 2011 passes through the upper runner plate 302, through the second runner hole 3012, and into the nozzle sleeve 501. Liquid silicone flows from the second runner hole 3012 into the nozzle sleeve 501. The control cylinder 201 drives the valve needle 2011 to open and close the gate of the nozzle sleeve 501, and the liquid silicone flows through the nozzle sleeve 501 into the mold cavity. Furthermore, a timing control valve 502 is installed on the side of the fixed template 50. The timing control valve 502 can simultaneously control the extension and retraction of the valve needle 2011 driven by the cylinder 201, facilitating the synchronous opening and closing of the valve needles 2011 of multiple gates, thereby ensuring the parallelism of the product pouring.

[0031] In addition, a partition plate 40 is provided between the manifold 30 and the fixed template 50 to prevent the heat of the fixed template 50 from being transferred to the manifold 30, and to prevent the liquid silicone from solidifying and blocking the first flow channel hole 3032 and the second flow channel hole 3012 when heated in the manifold 30.

[0032] The above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A mold structure for solving the problem of overflow in the cold runner of LSR, characterized in that: The device includes, from top to bottom, a heat insulation plate, a fixing plate, a flow divider plate, and a fixed template. A cylinder is mounted on the fixing plate. The flow divider plate has an installation groove, and a flow channel plate is installed in the installation groove. The flow channel plate includes an upper flow channel plate and a lower flow channel plate. A nozzle sleeve is provided on the fixed template. The lower flow channel plate has an upper flow channel and several first flow channel holes. The upper flow channel is connected to the first flow channel holes. Several sets of second flow channel holes and a lower flow channel are provided at the bottom of the installation groove. The lower flow channel is connected to the second flow channel holes. The fixing plate has a glue inlet, which is connected to the upper flow channel. A valve needle is mounted on the cylinder. The valve needle passes through the upper flow channel plate, through the second flow channel hole, and to the nozzle sleeve.

2. The mold structure for solving the problem of LSR cold runner overflow according to claim 1, characterized in that: A sealing groove is provided around the upper flow channel and the lower flow channel, and a sealing ring is installed in the sealing groove.

3. The mold structure for solving the problem of LSR cold runner overflow according to claim 1, characterized in that: Two positioning posts are further provided at the bottom of the mounting groove, and two positioning holes are opened in the flow channel plate, with the positioning posts corresponding to the positioning holes.

4. The mold structure for solving the problem of LSR cold runner overflow according to claim 1, characterized in that: A timing control valve is installed on the side of the fixed template.

5. The mold structure for solving the problem of LSR cold runner overflow according to claim 1, characterized in that: A partition is provided between the flow divider and the fixed template.

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