A mold structure for preventing a shrinkage clip from being pinched after an injection-molded product is ejected

Abstract

The utility model relates to mould structure technical field discloses a mould structure of preventing injection moulded product ejection post shrinkage clamp piece, including lower mould, the lower mould inner wall is provided with demoulding electric telescopic handle, the lower mould inside is provided with the backup pad, the backup pad end face is provided with a plurality of demoulding mechanism, a plurality of demoulding mechanism includes a plurality of cylinder, a plurality of cylinder inner wall all are provided with the air release electric telescopic handle, a plurality of air release electric telescopic handle output all are provided with the limit column. In the utility model, the limit column is cancelled the obstruction to the hole above the second air passage by sliding down in the air hole, lets air pass through the second air passage and can be connected with the lower mould inside, plays the function of deflation, when deflation is completed, the demoulding electric telescopic handle pulls the cylinder and goes up to the model and pushes, air will enter the gap between the model and the mould, make the model demoulding more relaxed, effectively avoid the model to appear shrinkage clamp piece's situation.

Description

Technical Field

[0001] This utility model relates to the field of mold structure technology, and in particular to a mold structure for preventing shrinkage of clamping parts after injection molding products are ejected. Background Technology

[0002] Injection molding is a highly efficient manufacturing process for thermoplastic products. The process involves injecting molten plastic into the cavity of a mold, which then cools and solidifies. The ejection system of the mold then removes the molded product from the mold core. Some products with special structures do not immediately complete all shrinkage after ejection. Instead, they continue to shrink inward due to temperature changes for a short period after being freed from the core constraint. This phenomenon is called post-shrinkage, and the mold that causes post-shrinkage will clamp the mold.

[0003] Most existing mold mechanisms use an ejector pin structure to push the mold during demolding. However, the mold that is completely in contact with the mold will generate a vacuum suction force, which will aggravate the shrinkage. A simple ejector pin structure cannot solve this problem. Therefore, those skilled in the art have provided a mold structure that prevents shrinkage of the clamping part after the injection molded product is ejected, so as to solve the problem mentioned in the background art. Utility Model Content

[0004] The purpose of this invention is to address the shortcomings of existing technologies by proposing a mold structure that prevents shrinkage of the clamping parts after injection molding. By first releasing the air and then inflating it in conjunction with the column, the mold can be demolded more easily, and the shrinkage of the clamping parts can be avoided.

[0005] To achieve the above objectives, this utility model provides the following technical solution: a mold structure for preventing shrinkage of clamping parts after ejection of injection molded products, including a lower mold, an electric telescopic rod for demolding provided on the inner wall of the lower mold, a support plate provided inside the lower mold, and a plurality of demolding mechanisms provided on the end face of the support plate; The demolding mechanism includes multiple columns, each column having an electric venting telescopic rod on its inner wall, a limiting column at the output end of each electric venting telescopic rod, an air pump on its inner wall, air holes on the end faces of each column, four second air passages on the inner walls of each air hole, and a third air passage connected to each second air passage.

[0006] Furthermore, an upper mold is provided at the outer end of the lower mold, and an injection nozzle is provided on the end face of the upper mold.

[0007] Furthermore, the inner wall of the lower mold is provided with two flexible plates, and the output end of the demolding electric telescopic rod is located on the end face of the support plate.

[0008] Furthermore, the end face of the support plate is provided with two limiting grooves, and the inner wall of the lower mold is provided with two limiting posts, which are respectively disposed inside the two limiting grooves.

[0009] Furthermore, the inner wall of the lower mold is provided with multiple demolding holes, and multiple demolding mechanisms are respectively arranged on the inner wall of the multiple demolding holes.

[0010] Furthermore, each of the plurality of limiting columns is provided with a groove inside, and each of the plurality of grooves has four connecting holes on its inner wall.

[0011] Furthermore, each of the multiple limiting columns has a first air passage on its end face, and each of the multiple air pumps is connected to the multiple first air passages via air pipes.

[0012] Furthermore, each of the outer end faces of the plurality of columns is provided with four square grooves, and the plurality of limiting columns are respectively disposed on the inner wall of the plurality of vents.

[0013] This utility model has the following beneficial effects: 1. This utility model proposes a mold structure to prevent shrinkage of clamping parts after injection molding of products. After the mold is injection molded, the venting electric telescopic rod in the demolding mechanism is activated. The venting electric telescopic rod pulls the limiting column, allowing the limiting column to slide downward inside the air hole and remove the obstruction of the upper hole of the second air channel. This allows air to connect with the lower mold through the second air channel, playing a role in venting. This eliminates the vacuum suction force, making the mold demolding more convenient and avoiding the situation of shrinkage clamping parts in the mold.

[0014] 2. The present invention proposes a mold structure to prevent shrinkage of the clamping parts after ejection of injection molded products. After the air is released, the venting electric telescopic rod is activated to drive the limiting column to descend so that the hole on the limiting column is aligned with the hole below the second air channel. The air pump is activated to inflate the limiting column so that the gas enters the second air channel. The demolding electric telescopic rod pulls the column to rise and pushes the mold. Air will enter the gap between the mold and the mold, making the demolding of the mold easier and effectively preventing the mold from shrinking the clamping parts. Attached Figure Description

[0015] Figure 1 This is an axonometric view of the present invention; Figure 2 This is a side axial section schematic diagram of the lower mold of this utility model; Figure 3 This is an axonometric view of the support plate of this utility model; Figure 4 This is an axonometric view of the column of this utility model; Figure 5 This is a side sectional axial view of the demolding mechanism of this utility model.

[0016] Legend: 1. Lower mold; 2. Demolding hole; 3. Demolding mechanism; 4. Upper mold; 5. Injection nozzle; 6. Limiting post; 7. Flexible plate; 8. Support plate; 9. Limiting groove; 10. Electric demolding telescopic rod; 301. Column; 302. Square groove; 303. Air hole; 304. Limiting post; 305. Electric venting telescopic rod; 306. Air pump; 307. Air pipe; 308. First air passage; 309. Plate groove; 310. Connecting hole; 311. Second air passage; 312. Third air passage. Detailed Implementation

[0017] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0018] Example 1, referring to Figures 1 to 3 One embodiment of this utility model is a mold structure for preventing shrinkage of clamping parts after ejection of injection molded products, including a lower mold 1, an electric demolding telescopic rod 10 provided on the inner wall of the lower mold 1, a support plate 8 provided inside the lower mold 1, and a plurality of demolding mechanisms 3 provided on the end face of the support plate 8.

[0019] Furthermore, an upper mold 4 is provided at the outer end of the lower mold 1, and an injection nozzle 5 is provided on the end face of the upper mold 4. Two flexible plates 7 are provided on the inner wall of the lower mold 1. The output end of the demolding electric telescopic rod 10 is provided on the end face of the support plate 8. Two limiting grooves 9 are provided on the end face of the support plate 8. Two limiting posts 6 are provided on the inner wall of the lower mold 1. The two limiting posts 6 are respectively provided inside the two limiting grooves 9. Multiple demolding holes 2 are provided on the inner wall of the lower mold 1. Multiple demolding mechanisms 3 are respectively provided on the inner wall of the multiple demolding holes 2.

[0020] Specifically, the demolding electric telescopic rod 10 is fixedly installed in the middle of the inner top surface of the lower mold 1, the support plate 8 is slidably installed on the inner wall of the lower mold 1, multiple demolding mechanisms 3 are equidistantly fixed on the upper end surface of the support plate 8, the upper mold 4 is movably installed on the upper end of the upper mold 4, the injection nozzle 5 is opened in the middle of the upper end surface of the upper mold 4, two flexible plates 7 are respectively fixedly installed on the front and rear sides between the support plate 8 and the inner top surface of the lower mold 1, the flexible plates 7 can be folded to limit the downward position of the support plate 8, two limiting posts 6 are respectively fixedly installed on both sides between the inner top surface and the inner bottom surface of the lower mold 1, the upper end surface of the support plate 8 is provided with limiting grooves 9 on both sides, the two limiting posts 6 and the two limiting grooves 9 are slidably connected, there are six demolding holes 2, three in a group are opened on the front and rear sides of the inner top surface of the lower mold 1, and the demolding mechanism 3 is slidably sleeved on the inner wall of the demolding hole 2.

[0021] Example 2, refer to Figures 4 to 5 An embodiment of this utility model provides: multiple demolding mechanisms 3 include multiple columns 301, each column 301 has an electric venting telescopic rod 305 on its inner wall, each electric venting telescopic rod 305 has a limiting post 304 at its output end, each column 301 has an air pump 306 on its inner wall, each column 301 has an air hole 303 on its end face, each air hole 303 has four second air passages 311 on its inner wall, and each second air passage 311 is connected to a third air passage 312.

[0022] Furthermore, each of the multiple limiting posts 304 has a groove 309 inside, and each groove 309 has four connecting holes 310 on its inner wall. Each of the multiple limiting posts 304 has a first air passage 308 on its end face. Each of the multiple air pumps 306 is connected to the multiple first air passages 308 through an air pipe 307. Each of the multiple posts 301 has four square grooves 302 on its outer end face. Each of the multiple limiting posts 304 is respectively set on the inner wall of the multiple air holes 303.

[0023] Specifically, the deflation electric telescopic rod 305 is fixedly installed at the middle position of the inner bottom surface of the column 301, the limiting column 304 is fixedly installed at the output end of the deflation electric telescopic rod 305, the air pump 306 is fixedly installed at the front side of the inner bottom surface of the column 301, the air hole 303 is opened at the middle position of the upper end face of the column 301, four second air passages 311 are equidistantly opened on the inner wall of the air hole 303, and the second air passage 311 is provided with two holes respectively located on the upper and lower sides of the air hole 303, and four third air passages 312 are equidistantly opened on the upper side of the outer end face of the column 301, and the third air passages 312 and the second air passages 312 are connected. The upper side of the channel 311 is connected and the groove 309 is opened in the middle of the inside of the limiting post 304. The connecting hole 310 is opened at equal intervals in the middle of the outer end face of the limiting post 304. The connecting hole 310 and the second air channel 311 are opened in the same direction. The first air channel 308 is opened in the middle of the lower end face of the limiting post 304, near the front. The air pipe 307 is embedded in the lower side of the inner wall of the first air channel 308. The first air channel 308 is connected to the inner bottom surface of the groove 309. The limiting post 304 is slidably sleeved on the inner wall of the air hole 303. Four square grooves 302 are opened at equal intervals in the lower side of the outer end face of the post 301.

[0024] Working principle: The upper mold 4 and the lower mold 1 are combined, and injection molding is performed into the mold through the injection nozzle 5. After the model is formed, the venting electric telescopic rod 305 is activated to pull the limiting column 304, causing the limiting column 304 to descend and move away from the obstruction of the second air passage 311. At this time, air can be discharged from the hole below the second air passage 311. Then, the venting electric telescopic rod 305 is activated again to pull the limiting column 304. The limiting column 304 connects the connecting hole 310 with the hole below the second air passage 311. At this time, the air pump 306 is activated to fill the first air passage 308 through the air pipe 307. The gas reaches the tray 309 and then enters the inner wall of the second air passage 311 through the connecting hole 310. The gas enters the space between the model and the mold from the second air passage 311 and the third air passage 312. At this time, the demolding electric telescopic rod 10 is activated to pull the support plate 8, causing the support plate 8 to push the model through the column 301 and cooperate with the gas to demold the model.

[0025] Finally, it should be noted that the above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Although the present utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A mold structure for preventing shrinkage of clamping parts after ejection of injection molded products, comprising a lower mold (1), characterized in that: The lower mold (1) is provided with a demolding electric telescopic rod (10) on its inner wall, and a support plate (8) is provided inside the lower mold (1). Multiple demolding mechanisms (3) are provided on the end face of the support plate (8). The multiple demolding mechanisms (3) include multiple columns (301), each column (301) has an electric venting telescopic rod (305) on its inner wall, each electric venting telescopic rod (305) has a limiting column (304) at its output end, each column (301) has an air pump (306) on its inner wall, each column (301) has an air hole (303) on its end face, each air hole (303) has four second air passages (311) on its inner wall, and each second air passage (311) is connected to a third air passage (312).

2. The mold structure for preventing shrinkage of the clamping part after ejection of the injection molded product according to claim 1, characterized in that: The lower mold (1) is provided with an upper mold (4) at its outer end, and the upper mold (4) has an injection nozzle (5) on its end face.

3. The mold structure for preventing shrinkage of the clamping part after ejection of the injection molded product according to claim 1, characterized in that: The inner wall of the lower mold (1) is provided with two soft plates (7), and the output end of the demolding electric telescopic rod (10) is located on the end face of the support plate (8).

4. The mold structure for preventing shrinkage of the clamping part after ejection of the injection molded product according to claim 1, characterized in that: The support plate (8) has two limiting grooves (9) on its end face, and the lower mold (1) has two limiting posts (6) on its inner wall. The two limiting posts (6) are respectively set inside the two limiting grooves (9).

5. The mold structure for preventing shrinkage of the clamping part after ejection of the injection molded product according to claim 1, characterized in that: The lower mold (1) has multiple demolding holes (2) on its inner wall, and multiple demolding mechanisms (3) are respectively arranged on the inner wall of the multiple demolding holes (2).

6. The mold structure for preventing shrinkage of the clamping part after ejection of the injection molded product according to claim 1, characterized in that: Each of the multiple limiting posts (304) has a groove (309) inside, and each of the multiple grooves (309) has four connecting holes (310) on its inner wall.

7. The mold structure for preventing shrinkage of the clamping part after ejection of the injection molded product according to claim 1, characterized in that: Each of the multiple limiting posts (304) has a first air passage (308) on its end face, and each of the multiple air pumps (306) is connected to the multiple first air passages (308) through an air pipe (307).

8. The mold structure for preventing shrinkage of the clamping part after ejection of the injection molded product according to claim 1, characterized in that: Each of the multiple columns (301) has four square grooves (302) on its outer end face, and the multiple limiting columns (304) are respectively arranged on the inner wall of multiple air holes (303).

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