Injection mold for thin-walled plastic parts

Abstract

The utility model discloses a kind of thin-wall plastic injection mould, including fixed mould, the upper end of fixed mould is equipped with runner, the lower end of fixed mould is equipped with lug, the top of fixed mould inside is equipped with hydraulic ram a, the output end of hydraulic ram a is connected with mold split, the front and rear ends of mold split are all penetrated by guide rod, the upper end of guide rod is connected with fixed mould;The upper end of mold split is equipped with movable mould, the inside of movable mould is penetrated by slide rod, and the one end between slide rod and movable mould is connected with spring a, the lower end of slide rod is connected with mold split;The left and right sides of mold split are all equipped with rotating rod.The thin-wall plastic injection mould moves by driving mold split, so that mold split and movable mould are separated from fixed mould, simultaneously drive adjusting plate to rotate, control movable mould to move and mold split to separate, realize the first stage separation stripping of plastic part, this separation mode guarantees that each position of plastic part is balanced, avoid its small area top and cause stress damage.

Description

Technical Field

[0001] This utility model relates to the field of injection mold technology, specifically to a thin-walled plastic injection mold. Background Technology

[0002] With the continuous advancement of technology, plastic products are being used more and more widely in various fields, and the demand for thinner plastic parts is increasing. Thin-walled plastic parts have advantages such as light weight and low material consumption, but they face many challenges in the injection molding process.

[0003] Traditional injection molds, when producing thin-walled plastic parts, apply ejection force to a small area during demolding due to the thinness of the plastic parts, which can easily damage the parts. They also cannot loosen the thin-walled plastic parts in stages for demolding. Therefore, we propose a thin-walled plastic part injection mold to solve the above-mentioned problems. Utility Model Content

[0004] The purpose of this utility model is to provide a thin-walled plastic injection mold to solve the problem mentioned in the background art that, due to the thin wall thickness of the plastic parts, the ejection force applied to the thin-walled plastic parts during the demolding process is applied to a small area, which easily causes damage to the plastic parts and makes it impossible to gradually loosen the thin-walled plastic parts for demolding in stages.

[0005] To achieve the above objectives, this utility model provides the following technical solution: a thin-walled plastic injection mold, including a fixed mold, a flow channel is provided at the upper end of the fixed mold, a protrusion is installed at the lower end of the fixed mold, a hydraulic rod a is installed at the top of the inner side of the fixed mold, the output end of the hydraulic rod a is connected to a mold parting, and guide rods are passed through both the front and rear ends of the mold parting, with the upper end of the guide rods connected to the fixed mold;

[0006] The upper end of the mold is fitted with a moving mold, and a sliding rod runs through the interior of the moving mold. One end of the sliding rod is connected to the moving mold by a spring a, and the lower end of the sliding rod is connected to the mold.

[0007] Rotating rods are installed on both the left and right sides of the mold parting, and adjusting plates are connected to the outer sides of the rotating rods. A spring c is connected between the adjusting plates and the mold parting.

[0008] A hydraulic rod b is installed inside the mold, and the output end of the hydraulic rod b is connected to a mounting plate. A top rod is connected to the upper side of the mounting plate.

[0009] The left and right side walls of the mold are equipped with drive components to assist in the loosening and demolding of the plastic parts.

[0010] Preferably, the drive assembly includes air passages formed on the left and right side walls of the mold parting, a piston is disposed inside the air passage, a spring b is connected between the piston and the air passage, and a moving rod is connected to one side of the piston.

[0011] Preferably, the contact surfaces between the protrusions and the adjusting plate are distributed in an inclined manner, and the adjusting plate has an inclined structure.

[0012] Preferably, the width of the moving mold is less than the distance between two adjacent protrusions, and the distance between two adjacent protrusions is less than the length of the adjusting plate.

[0013] Preferably, the adjusting plate forms a rotating structure with the mold splitting rod, and one side of the adjusting plate is in contact with the moving rod.

[0014] Preferably, the ejector pin slides through the mold parting line, and the highest point of the ejector pin in the initial state is flush with the highest point of the mold parting line.

[0015] Compared with the prior art, the beneficial effects of this utility model are:

[0016] (1) The thin-walled plastic injection mold drives the mold parting movement to separate the mold parting and the moving mold from the fixed mold. At the same time, it drives the adjustment plate to rotate, controls the movement of the moving mold and the separation of the mold parting, and realizes the first stage of separation and demolding of the plastic part. This separation method ensures that the plastic part is subjected to balanced force at each position and avoids small area push-up and force damage.

[0017] (2) When the driving adjustment plate rotates, the moving rod can be pushed to control the piston to slide in the air passage and spray out the air in the air passage. The air flow is used to blow the plastic part on the moving mold, making its edge loose. With the movement of the ejector rod, the plastic part can be demolded quickly and its demolding damage can be avoided. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0019] Figure 2 This is a schematic diagram of the structure of this utility model from below;

[0020] Figure 3 This is a cross-sectional structural diagram of the present invention;

[0021] Figure 4 This is a schematic diagram of the main cross-section of the present invention;

[0022] Figure 5 This utility model Figure 4 Enlarged structural diagram at point A in the diagram;

[0023] Figure 6 This is a schematic diagram of the parting section structure of this utility model;

[0024] Figure 7 This is a schematic diagram of the modular structure of this utility model.

[0025] In the diagram: 1. Fixed mold; 2. Runner; 3. Protrusion; 4. Hydraulic rod a; 5. Mold parting; 6. Guide rod; 7. Moving mold; 8. Slide rod; 9. Spring a; 10. Rotating rod; 11. Adjusting plate; 12. Hydraulic rod b; 13. Mounting plate; 14. Ejector rod; 15. Air passage; 16. Piston; 17. Spring b; 18. Moving rod; 19. Spring c. Detailed Implementation

[0026] 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.

[0027] Please see Figures 1-7 The present invention provides the following technical solution: a thin-walled plastic injection mold, including a fixed mold 1, a flow channel 2 opened at the upper end of the fixed mold 1, a protrusion 3 installed at the lower end of the fixed mold 1, a hydraulic rod a4 installed at the top of the inner side of the fixed mold 1, the output end of the hydraulic rod a4 connected to a parting mold 5, guide rods 6 passing through both the front and rear ends of the parting mold 5, the upper end of the guide rods 6 connected to the fixed mold 1; rotating rods 10 are installed on both the left and right sides of the parting mold 5, an adjusting plate 11 is connected to the outer side of the rotating rods 10, and a spring c19 is connected between the adjusting plate 11 and the parting mold 5;

[0028] Furthermore, the contact surfaces between the protrusions 3 and the adjusting plate 11 are distributed in an inclined manner, and the adjusting plate 11 has an inclined structure, so the protrusions 3 can be used to drive the adjusting plate 11 to rotate.

[0029] The upper end of the mold 5 is fitted with a moving mold 7, and a slide rod 8 passes through the interior of the moving mold 7. One end of the slide rod 8 is connected to the moving mold 7 by a spring a9, and the lower end of the slide rod 8 is connected to the mold 5.

[0030] Furthermore, the width of the moving mold 7 is less than the distance between two adjacent protrusions 3, and the distance between two adjacent protrusions 3 is less than the length of the adjusting plate 11. This can prevent the protrusions 3 from blocking the moving mold 7 from moving and allow the protrusions 3 to smoothly contact the adjusting plate 11.

[0031] A hydraulic rod b12 is installed inside the mold 5. The output end of the hydraulic rod b12 is connected to the mounting plate 13. A push rod 14 is connected to the upper side of the mounting plate 13.

[0032] Furthermore, the ejector pin 14 slides through the mold parting 5. The highest point of the ejector pin 14 in the initial state is flush with the highest point of the mold parting 5. The movement of the ejector pin 14 can be used to eject the plastic part out of the mold.

[0033] The left and right side walls of the mold 5 are equipped with drive components to help loosen and demold the plastic parts.

[0034] Furthermore, the drive assembly includes air passages 15 opened on the left and right side walls of the mold 5, a piston 16 is provided inside the air passages 15, a spring b17 is connected between the piston 16 and the air passages 15, and a moving rod 18 is connected to one side of the piston 16.

[0035] Furthermore, the adjusting plate 11 forms a rotating structure with the split mold 5 through the rotating rod 10. One side of the adjusting plate 11 contacts the moving rod 18. The moving rod 18 is pushed by the rotation of the adjusting plate 11 to realize the jetting of airflow.

[0036] Specifically, firstly, the plastic raw material is added to the barrel of the injection molding machine. The heating device of the injection molding machine heats the plastic raw material to a molten state. The molten plastic melt is injected into the cavity formed by the fixed mold 1, the moving mold 7, and the parting mold 5 through the runner 2. After molding and cooling in the cavity, the hydraulic rod a4 can be opened to push the parting mold 5 downward. At this time, the parting mold 5 drives the moving mold 7 to move downward synchronously until the adjusting plate 11 moves to contact the protrusion 3. Using the blocking of the protrusion 3, the adjusting plate 11 is rotated under force. The adjusting plate 11 squeezes and stores the spring c19. At the same time, the adjusting plate 11 pushes the moving mold 7 above, so that the moving mold 7 and the parting mold 5 gradually separate. At this time, the slide rod 8 slides in the moving mold 7 and squeezes and stores the spring a9, so that the moving mold 7 remains stable and moves vertically, separating the top of the parting mold 5 from the plastic part. This separation method ensures that the plastic part is subjected to balanced force at all positions, avoiding damage caused by small-area pushing.

[0037] During the first-stage separation process, the rotation of the adjusting plate 11 pushes the moving rod 18, causing the moving rod 18 to push the piston 16 connected to its end. The piston 16 ejects the airflow from the air passage 15, using the airflow to blow the plastic part on the moving mold 7, loosening its edges. This opens the hydraulic rod b12, pushing the ejector rod 14 upward. The ejector rod 14 then pushes the loosened plastic part to quickly demold. After the plastic part is demolded and removed, the hydraulic rod b12 can be controlled to retract, causing the ejector rod 14 to move downward and reset. At the same time, the hydraulic... When the pressure rod a4 retracts, it controls the mold parting 5 to move upward and reset. At this time, the push of the protrusion 3 on the adjusting plate 11 is released. At this time, the spring c19 drives the adjusting plate 11 to reset and rotate, releasing the push of the adjusting plate 11 on the moving mold 7 and the moving rod 18. The spring a9 can then control the moving mold 7 to reset. The spring b17 drives the piston 16 to reset and move, drawing the airflow back into the air passage 15, gradually completing the mold closing, and continuing to process the plastic part. The contents not described in detail in this specification are existing technologies known to those skilled in the art.

[0038] Although the present invention 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 invention should be included within the protection scope of the present invention.

Claims

1. A thin-walled plastic injection mold, comprising a fixed mold (1), characterized in that: The upper end of the fixed mold (1) is provided with a flow channel (2), the lower end of the fixed mold (1) is provided with a protrusion (3), the top of the inner side of the fixed mold (1) is provided with a hydraulic rod a (4), the output end of the hydraulic rod a (4) is connected to a mold splitting (5), and the front and rear ends of the mold splitting (5) are both provided with guide rods (6), the upper end of the guide rods (6) is connected to the fixed mold (1). The upper end of the split mold (5) is fitted with a moving mold (7), and a slide rod (8) runs through the interior of the moving mold (7). A spring a (9) is connected between one end of the slide rod (8) and the moving mold (7), and the lower end of the slide rod (8) is connected to the split mold (5). Rotating rods (10) are installed on both the left and right sides of the mold (5). An adjusting plate (11) is connected to the outside of the rotating rod (10). A spring c (19) is connected between the adjusting plate (11) and the mold (5). The mold (5) is equipped with a hydraulic rod b (12), the output end of the hydraulic rod b (12) is connected to a mounting plate (13), and the upper side of the mounting plate (13) is connected to a push rod (14). The left and right sidewalls of the mold parting (5) are equipped with drive components to assist in the loosening and demolding of plastic parts.

2. The thin-walled plastic injection mold according to claim 1, characterized in that: The drive assembly includes air passages (15) opened on the left and right side walls of the parting mold (5), a piston (16) is provided inside the air passage (15), a spring b (17) is connected between the piston (16) and the air passage (15), and a moving rod (18) is connected to one side of the piston (16).

3. The thin-walled plastic injection mold according to claim 1, characterized in that: The contact surfaces of the protrusions (3) and the adjusting plate (11) are distributed in an inclined manner, and the adjusting plate (11) has an inclined structure.

4. The thin-walled plastic injection mold according to claim 1, characterized in that: The width of the moving mold (7) is less than the distance between two adjacent protrusions (3), and the distance between two adjacent protrusions (3) is less than the length of the adjusting plate (11).

5. A thin-walled plastic injection mold according to claim 2, characterized in that: The adjusting plate (11) forms a rotating structure with the splitting mold (5) through the rotating rod (10), and one side of the adjusting plate (11) is in contact with the moving rod (18).

6. A thin-walled plastic injection mold according to claim 1, characterized in that: The push rod (14) slides through the mold part (5), and the highest point of the push rod (14) in the initial state is flush with the highest point of the mold part (5).

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