Front mold needle drawing structure

Abstract

The front mold needle drawing structure comprises a bottom plate, a plate B, a push plate, a plate A, a base plate, a stripper plate and a panel which are sequentially stacked from bottom to top, a rear mold core is installed in the plate A, a front mold core is installed at the position, corresponding to the rear mold core, of the top of the plate A, the upper portion of the front mold core is located in the base plate, a front insert is installed in the front mold core, and a movable block is movably arranged at the position, located at the top of the front insert, in the base plate; a front insert pin is further mounted on the movable block, and the front insert pin movably penetrates through the front insert; and a pull-open component is arranged at each of two ends of the movable block on the stripper plate, and when the stripper plate and the base plate are subjected to mold opening, the pull-open components are at least used for driving the front insert pin to be pulled out from the front insert through the movable block. According to the invention, smooth core pulling of the front insert pin can be realized in the mold opening process, the problem of mold sticking caused by large wrapping force of the column position of the product is avoided, and the demolding performance of the product is obviously improved.

Description

Technical Field

[0001] The present invention relates to the technical field of plastic molds, in particular to a front mold pin extraction structure. Background Art

[0002] In the field of plastic mold manufacturing, especially when it comes to products with deep front mold side columns near the gate, there are often problems with strong clamping force on the product column and easy mold sticking. There are two traditional solutions: 1) Use ordinary front mold pin molding and injection molding to apply release agent: Although this method can solve the mold sticking problem to a certain extent, it is not applicable because the product is a food-grade appearance part and release agent cannot be used.

[0003] 2) Using an eccentric nozzle and enlarging the mold and injection molding machine: While this method can achieve needle extraction, it has several drawbacks. First, product quality is unstable, increasing the defect rate. Second, manufacturing costs are significantly increased due to the need to modify the mold and injection molding machine. Finally, this solution significantly impacts product performance and normal production, failing to meet the requirements of efficient and stable production. Summary of the Invention

[0004] The purpose of the present invention is to provide a front mold needle extraction structure, which can realize the smooth core extraction of the front insert needle during the mold opening process, avoid the mold sticking problem caused by the large clamping force of the product column position, and significantly improve the demolding performance of the product. At the same time, compared with the traditional scheme, the present invention avoids the problem of unstable product quality caused by the use of release agents or the modification of the mold base and the injection molding machine, ensures the consistency and stability of the product, and reduces the defective rate.

[0005] In order to achieve the above objectives, the following technical solutions are adopted: A front mold needle extraction structure comprises a bottom plate, a B plate, a push plate, an A plate, a pad plate, a sprue plate and a panel plate which are stacked in sequence from bottom to top; a rear mold core is installed in the A plate, a front mold core is installed at the top of the A plate corresponding to the rear mold core, and the upper part of the front mold core is located in the pad plate, a front insert is installed in the front mold core, and a movable block is movably arranged in the pad plate at the top of the front insert; a front insert needle is also installed on the movable block, and the front insert needle is movably arranged through the front insert; a pulling assembly is installed at each end of the movable block on the sprue plate, and when the sprue plate and the pad plate are opened, the pulling assembly is at least used to drive the front insert needle to be pulled out from the front insert through the movable block; a filling nozzle is also installed on the panel, and the lower part of the filling nozzle is arranged in the sprue plate; the filling nozzle is provided with a melt flow outlet, and the melt flow outlet is also connected to a gate; the middle part of the gate is arranged in the pad plate, and the lower part of the gate is arranged through the front insert.

[0006] Furthermore, a first mounting groove is provided on the top of the pad, and the movable block is movably arranged in the first mounting groove; a first clamping slot is provided at each end of the movable block; the pulling assembly includes a fixed block and a swinging block; the fixed block is installed at the bottom of the sprue plate, and a U-shaped groove is provided at one end of the fixed block close to the movable block; a pin is connected between the inner walls on both sides of the U-shaped groove; the upper part of the swinging block is arranged in the U-shaped groove and is rotatably connected to the pin, and a torsion spring is also installed at the connection between the swinging block and the pin; the lower part of the swinging block is inserted in the first clamping slot, and the lower part of the swinging block is provided with a hook portion that extends obliquely in the direction of the first clamping slot.

[0007] Furthermore, the inner walls at both ends of the first mounting groove each provide a first socket that passes through to the top of the pad, and the lower part of the swing block is inserted into the first socket; the top of the pad is provided with a first inclined surface at one end of the first socket, and the first inclined surface is inclined downward in the direction of the first socket and passes through the first socket; the lower part of the inner wall at the bottom of the U-shaped notch is also provided with a second inclined surface, and the upper part of the second inclined surface is inclined upward in the direction of the pin; the first card slot is V-shaped, and the hook part is also provided with a V-shaped protrusion block that is compatible with the first card slot.

[0008] Furthermore, a second mounting groove connected to the first mounting groove is provided at the bottom of the pad, and the upper part of the front mold core is located in the second mounting groove; a first yellow spring is also provided between the top of the front insert and the bottom of the movable block.

[0009] Furthermore, the upper part of the pouring nozzle is of cylindrical structure, the lower part of the pouring nozzle is of conical structure, and the melt flow outlet is opened at the bottom of the pouring nozzle; the gate includes a first pipe; the middle of the top of the first pipe is also connected to a second pipe arranged in the vertical direction, and the second pipe is inserted from the melt flow outlet into the pouring nozzle; the two ends of the bottom of the first pipe are also connected to a third pipe arranged in the vertical direction; the top of the pad is provided with a third mounting groove perpendicular to the length direction of the first mounting groove, and the third mounting groove and the first mounting groove are arranged crosswise with each other; the first pipe is arranged in the third mounting groove, and the two third pipes are arranged through the front insert.

[0010] Furthermore, a connecting hole is respectively provided at both ends of the top of the first pipe; a hook is also installed at the lower part of the filling nozzle corresponding to the two connecting holes, and the hook is connected to the first pipe through the connecting hole.

[0011] Furthermore, a limiting pull rod is installed on the nozzle plate, and the lower part of the limiting pull rod passes through the pad and is inserted into the A plate; a second yellow spring is also provided between the bottom of the nozzle plate and the top of the pad, and the limiting pull rod is arranged through the second yellow spring.

[0012] By adopting the above scheme, the beneficial effects of the present invention are: The present invention can realize the smooth core pulling of the front insert pin during the mold opening process, avoids the mold sticking problem caused by the large clamping force of the product column position, and significantly improves the demoulding performance of the product. At the same time, compared with the traditional solution, the present invention avoids the problem of unstable product quality caused by the use of release agents or the modification of the mold base and the injection molding machine, ensures the consistency and stability of the product, and reduces the defective rate. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 A cross-sectional view of the present invention from a first viewing angle; Figure 2 for Figure 1 A partial enlarged schematic diagram; Figure 3 is a cross-sectional view from a second viewing angle of the present invention; Figure 4 A perspective view showing some structures omitted in the present invention; Figure 5 It is a partial enlarged schematic diagram of the pad of the present invention; Figure 6 It is a structural schematic diagram of the pull-out assembly, movable block and gate of the present invention; Figure 7 It is a structural schematic diagram of the fixing block of the present invention; Figure 8 A schematic diagram of the product structure; The accompanying drawings illustrate: 1. Bottom plate; 2. B plate; 3. Push plate; 4. A plate; 5. Pad; 6. Runner plate; 7. Face plate; 41. Rear mold core; 42. Front mold core; 43. Front insert; 44. First yellow spring; 51. Movable block; 52. Front insert; 53. First slot; 54. First mounting slot; 55. First jack; 56. First inclined surface; 57. Third mounting slot; 61. Fixed block; 62. Swing block; 63. U-shaped notch; 64. Pin; 65. Hook; 66. Second inclined surface; 67. V-shaped raised block; 68. Limiting rod; 69. Second yellow spring; 60. Front screw; 71. Filling nozzle; 72. Gate; 73. Hook; 721. First pipe; 722. Second pipe; 723. Third pipe. DETAILED DESCRIPTION

[0014] The present invention is described in detail below with reference to the accompanying drawings and specific embodiments.

[0015] Reference Figure 8As shown, the product targeted by the present invention is a transparent water tank, SAN rubber material, and a food-grade appearance part (no release agent can be applied). In order to smoothly extract the needle, a front mold needle extraction structure is designed, including a bottom plate 1, a B plate 2, a push plate 3, an A plate 4, a pad 5, a sprue plate 6 and a panel 7 stacked in sequence from bottom to top; a rear mold core 41 is installed in the A plate 4, and a front mold core 42 is installed at the top of the A plate 4 corresponding to the rear mold core 41, and the upper part of the front mold core 42 is located in the pad 5. In one embodiment, a front insert 43 is installed in the front mold core 42, and a movable part is movably arranged in the pad 5 at the top of the front insert 43. The movable block 51 is provided with a front insert 52, and the front insert 52 is movable through the front insert 43; a pull-out assembly is installed at each end of the movable block 51 on the sprue plate 6, and when the sprue plate 6 and the backing plate 5 are molded, the pull-out assembly is at least used to drive the front insert 52 to be pulled out from the front insert 43 through the movable block 51; a filling nozzle 71 is also installed on the panel 7, and the lower part of the filling nozzle 71 is arranged in the sprue plate 6; the filling nozzle 71 is provided with a melt flow outlet, and the melt flow outlet is also connected to a gate 72; the middle part of the gate 72 is arranged in the backing plate 5, and the lower part of the gate 72 is arranged through the front insert 43.

[0016] Furthermore, in this embodiment, a first mounting groove 54 is provided on the top of the pad 5, and the movable block 51 is movably arranged in the first mounting groove 54; a first clamping groove 53 is also provided at each end of the movable block 51; the pulling assembly includes a fixed block 61 and a swinging block 62; the fixed block 61 is installed at the bottom of the nozzle plate 6, and a U-shaped notch 63 is also provided at one end of the fixed block 61 close to the movable block 51; a pin 64 is connected between the inner walls of both sides of the U-shaped notch 63; the upper part of the swinging block 62 is arranged in the U-shaped notch 63 and is rotatably connected to the pin 64, and a torsion spring is also installed at the connection between the swinging block 62 and the pin 64; the lower part of the swinging block 62 is inserted in the first clamping groove 53, and swings The lower part of the block 62 is provided with a hook portion 65 extending obliquely in the direction of the first slot 53; the inner walls at both ends of the first mounting slot 54 are also provided with a first socket 55 that passes through to the top of the pad 5, and the lower part of the swing block 62 is inserted into the first socket 55; the top of the pad 5 is provided with a first inclined surface 56 at one end of the first socket 55, and the first inclined surface 56 is inclined downward in the direction of the first socket 55 and passes through the first socket 55; the lower part of the inner wall at the bottom of the U-shaped notch 63 is also provided with a second inclined surface 66, and the upper part of the second inclined surface 66 is inclined upward in the direction of the pin 64; the first slot 53 is V-shaped, and the hook portion 65 is also provided with a V-shaped protrusion block 67 that is adapted to the first slot 53.

[0017] The swing block 62 can rotate relative to the pin 64. In the initial state, the swing block 62 is in an inclined state, that is, one side of the upper part of the swing block 62 is in contact with the second inclined surface 66. The second inclined surface 66 is a swing limit surface that can limit the swing amplitude of the swing block 62. The first inclined surface 56 on the backing plate 5 is a mold closing reset surface. When the backing plate 5 and the gate plate 6 are closed, the hook portion 65 at the lower part of the swing block 62 will be blocked by the first inclined surface 56, thereby causing the swing block 62 to rotate in the direction of the first slot 53, that is, to move along the first inclined surface 56. Inserted into the first socket 55, during the process of the swing block 62 being inserted into the first socket 55, the V-shaped protrusion block 67 can be inserted into the first slot 53 until the lower surface of the V-shaped protrusion block 67 is in contact with the V-shaped lower inclined surface (the first slot 53 is V-shaped, and its V-shaped lower inclined surface is a movable limiting surface, which can limit the rotation stroke of the swing block 62). Subsequently, when the pad 5 and the sprue plate 6 are opened, the swing block 62 can lift the movable block 51 upward through the V-shaped protrusion block 67, and then pull the front insert 52 out of the front insert 43.

[0018] Furthermore, in this embodiment, a second mounting groove communicating with the first mounting groove 54 is further provided at the bottom of the backing plate 5, and the upper portion of the front mold core 42 is located in the second mounting groove; a first yellow spring 44 is further provided between the top of the front insert 43 and the bottom of the movable block 51; the upper portion of the nozzle 71 is cylindrical in structure, the lower portion of the nozzle 71 is conical in structure, and the melt flow outlet is provided at the bottom of the nozzle 71; the gate 72 includes a first pipe 721; the middle of the top of the first pipe 721 is further connected to a second pipe 722 arranged in a vertical direction, and the second pipe 722 is inserted from the melt flow outlet to the nozzle 71; the two ends of the bottom of the first pipe 721 are also connected to a third pipe 723 arranged in the vertical direction; the top of the pad 5 is provided with a third mounting groove 57 perpendicular to the length direction of the first mounting groove 54, and the third mounting groove 57 and the first mounting groove 54 are arranged crosswise with each other; the first pipe 721 is arranged in the third mounting groove 57, and the two third pipes 723 are arranged through the front insert 43; a connecting hole is provided at each end of the top of the first pipe 721; a hook 73 is also installed at the lower part of the filling nozzle 71 corresponding to the two connecting holes, and the hook 73 is connected to the first pipe 721 through the connecting hole.

[0019] In this embodiment, the product is cast using two fine nozzles (i.e., two third pipes 723), and there is a column position in the middle of the product. During injection molding, the column position has a large clamping force and is easy to stick to the mold; the column position in the middle of the product is formed by a front pin 52, and the front pin 52 is mounted on the movable block 51. The movable block 51 is mounted in the pad 5 and has two first yellow springs 44 underneath it. The fixed block 61 is mounted on the nozzle plate 6 and has a pin 64 that can drive the swing block 62 to realize the pulling and resetting action. When resetting, when the hook portion 65 of the swing block 62 contacts the mold reset surface on the pad 5, it will be forced into the first plug hole 55, and the V-shaped protrusion block 67 will be inserted into the first slot 53, and then the mold is closed together.

[0020] When opening the mold, first the A / B plate 2 does not move, and the space between the pad 5 and the nozzle plate 6 is opened first. At this time, the fine nozzle is pulled off by the hook needle 73 and remains on the nozzle plate 6, and the swing block 62 pulls the movable block 51 and drives the front needle 52 to pull the core first. The first yellow spring 44 below it plays an auxiliary role and prevents the front needle 52 from retreating, so that there is a large gap between the front needle 52 and the product column surface and it does not stick to the mold. Then continue to open the pad 5 and the nozzle plate 6. The swing block 62 swings outward and separates from the movable block 51 due to the released retreat space. The swing block 62 stops when it rotates to the swing limit surface on the fixed block 61. When the pad 5 and the nozzle plate 6 are opened to 115mm (a limit pull rod 68 is also installed on the nozzle plate 6, and the lower part of the limit pull rod 68 penetrates After passing the pad 5, it is inserted into the A plate 4. A second yellow spring 69 is also provided between the bottom of the sprue plate 6 and the top of the pad 5. The limiting pull rod 68 is arranged through the second yellow spring 69, and the opening distance is controlled by the limiting pull rod 68). The first mold opening is completed; then, the sprue plate 6 and the panel 7 are opened, and the fine sprue is separated from the hook needle 73 and automatically falls off (a front mountain screw 60 is also installed on the sprue plate 6, and the upper part of the front mountain screw 60 is inserted into the panel 7, and the opening distance is controlled to be 10mm by the front mountain screw 60). The second mold opening is completed; finally, the A / B plate 2 is opened, the third mold opening is completed, the product is ejected, and then the product is taken out and enters the next working cycle, thereby meeting the mold opening requirements and normal production of such products.

[0021] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A front mold needle extraction structure, comprising a bottom plate, a B plate, a push plate, an A plate, a pad plate, a sprue plate, and a face plate stacked in sequence from bottom to top; a rear mold core is installed in the A plate, a front mold core is installed on the top of the A plate corresponding to the rear mold core, and the upper part of the front mold core is located in the pad plate, characterized in that: A front insert is installed in the front mold core, and a movable block is movably arranged on the top of the front insert in the pad; a front insert needle is also installed on the movable block, and the front insert needle is movably arranged through the front insert; a pulling assembly is installed on each end of the movable block on the sprue plate, and when the sprue plate and the pad are opened, the pulling assembly is at least used to drive the front insert needle to be pulled out from the front insert through the movable block; a filling nozzle is also installed on the panel, and the lower part of the filling nozzle is arranged in the sprue plate; the filling nozzle is provided with a melt flow outlet, and the melt flow outlet is also connected to a gate; the middle part of the gate is arranged in the pad, and the lower part of the gate passes through the front insert.

2. The front mold needle extraction structure according to claim 1, characterized in that: The top of the pad is provided with a first mounting groove, and the movable block is movably arranged in the first mounting groove; a first clamping slot is also provided at each end of the movable block; the pulling assembly includes a fixed block and a swinging block; the fixed block is installed at the bottom of the sprue plate, and a U-shaped groove is also provided at one end of the fixed block close to the movable block; a pin is connected between the inner walls on both sides of the U-shaped groove; the upper part of the swinging block is arranged in the U-shaped groove and is rotatably connected to the pin, and a torsion spring is also installed at the connection between the swinging block and the pin; the lower part of the swinging block is inserted in the first clamping slot, and the lower part of the swinging block is provided with a hook portion that extends obliquely in the direction of the first clamping slot.

3. The front mold needle extraction structure according to claim 2, characterized in that: The inner walls at both ends of the first mounting groove each have a first socket that passes through to the top of the pad, and the lower part of the swing block is inserted into the first socket; the top of the pad is provided with a first inclined surface at one end of the first socket, and the first inclined surface is inclined downward in the direction of the first socket and passes through the first socket; the lower part of the inner wall at the bottom of the U-shaped notch is also provided with a second inclined surface, and the upper part of the second inclined surface is inclined upward in the direction of the pin; the first card slot is V-shaped, and the hook part is also provided with a V-shaped protrusion block that is compatible with the first card slot.

4. The front mold needle extraction structure according to claim 3, characterized in that: The bottom of the pad is also provided with a second mounting groove connected to the first mounting groove, and the upper part of the front mold core is located in the second mounting groove; a first yellow spring is also provided between the top of the front insert and the bottom of the movable block.

5. The front mold needle extraction structure according to claim 2, characterized in that: The upper part of the pouring nozzle is cylindrical in structure, the lower part of the pouring nozzle is conical in structure, and the melt flow outlet is opened at the bottom of the pouring nozzle; the gate includes a first pipe; the middle of the top of the first pipe is also connected to a second pipe arranged in the vertical direction, and the second pipe is inserted from the melt flow outlet into the pouring nozzle; the two ends of the bottom of the first pipe are also connected to a third pipe arranged in the vertical direction; the top of the pad is provided with a third mounting groove perpendicular to the length direction of the first mounting groove, and the third mounting groove and the first mounting groove are arranged crosswise with each other; the first pipe is arranged in the third mounting groove, and the two third pipes are arranged through the front insert.

6. The front mold needle extraction structure according to claim 5, characterized in that: A connecting hole is respectively provided at both ends of the top of the first pipe; a hook is respectively installed at the lower part of the filling nozzle corresponding to the two connecting holes, and the hook is connected to the first pipe through the connecting hole.

7. The front mold needle extraction structure according to claim 1, characterized in that: A limiting pull rod is also installed on the nozzle plate, and the lower part of the limiting pull rod passes through the pad and is inserted into the A plate; a second yellow spring is also provided between the bottom of the nozzle plate and the top of the pad, and the limiting pull rod is arranged through the second yellow spring.

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