In-mold automatic sprue cutting device

Abstract

The invention relates to an in-mold automatic cutting pouring gate device, which belongs to the technical field of injection mold accessories, and comprises a pressing block, the pressing block is arranged in a pressing block groove and is fixedly provided with a convex block capable of being pressed on a pouring gate piece in a pouring groove, the bottom end of the pressing block is provided with an insertion hole communicated with a pressing block through hole, and a limiting ring is fixed on the inner hole wall of the insertion hole in a penetrating manner; the top end of the pressing block ejector pin can abut against the bottom end of the limiting ring, so that after the plastic part ejector pin ejects an injection molding finished product in the groove, the pressing block ejector pin is used for ejecting the pressing block. After the injection mold is opened, an injection molding finished product is ejected out through the plastic part ejector pin, and due to the fact that the protruding block makes contact with the sprue part in a pressing mode, the injection molding finished product can be automatically separated from the sprue part; and then a pressing block ejector pin is used for delaying (the pressing block ejector pin firstly slides in an insertion hole, when an injection molding finished product is automatically separated from the sprue piece, the pressing block ejector pin makes contact with a limiting ring, and the pressing block is pushed upwards to move upwards) to eject out the pressing block, so that the sprue piece loses supporting force and is separated from a pouring groove, and demolding of the sprue piece is completed.

Description

Technical Field

[0001] The invention relates to the technical field of injection mold accessories, and in particular to an in-mold automatic cutting gate device. Background Art

[0002] Injection molds are tools for producing plastic products and also tools for giving plastic products complete structures and precise dimensions. Injection molding is a processing method used in mass production of certain parts with complex shapes. Specifically, it refers to injecting heated and melted plastic into the mold cavity under high pressure by an injection molding machine, and then cooling and solidifying to obtain a molded product.

[0003] At present, the traditional injection mold is mainly composed of an upper template, a lower template and an ejector rod, wherein the upper template is provided with a casting hole; the lower template is located below the upper template and its top surface is provided with a mold groove, and the bottom of the lower mold groove is provided with an ejector hole; the ejector rod slides in the ejector; in actual application, the upper template is pressed against the lower template, the ejector rod is placed in the ejector hole, and an injection cavity is formed between the ejector rod, the casting hole and the mold groove; when the finished product is formed in the injection cavity, the ejector rod can be pushed upward to eject the injection molded product. Although the above structure can realize the rapid demolding of the injection molded product, after the injection molded product is demolded, since the injection molded product is connected to the gate piece in the casting hole, it needs to be manually trimmed again, which is time-consuming and labor-intensive, and increases the process and labor costs.

[0004] Therefore, how to design an automatic in-film cutting gate device that has a simple structure, is easy to operate, and can automatically cut the gate piece is a problem that technical personnel in this field urgently need to solve. Summary of the invention

[0005] The invention provides an in-mold automatic cutting gate device, which solves the technical problem that the existing injection mold cannot automatically cut the gate piece, which increases the process and labor costs.

[0006] The technical solution of the present invention to solve the above technical problems is as follows: an in-mold automatic cutting gate device is installed on an injection mold, the injection mold includes a base, a lower template, an upper template and an ejector plate, the interior of the base is provided with a lifting area and the bottom end thereof is provided with an ejector hole connected to the lifting area; the lower template is placed on the base and a groove is provided on its top surface; the upper template is placed on the lower template and a casting hole is provided on it; the ejector plate is placed in the lifting area; an ejector rod is slid in the ejector hole to push the ejector plate to move up and down; it includes: a pressing block,

[0007] The top of the base is provided with a plastic part through hole and a pressing block through hole communicating with the lifting zone; the top surface of the lower template is provided with a pressing block groove and a casting groove communicating with the casting hole and the molding groove, the bottom of the molding groove is provided with a plastic part through hole communicating with the plastic part through hole, and the bottom of the pressing block groove is provided with a pressing block through hole communicating with the pressing block through hole; the top surface of the ejector plate is fixed with a plastic part ejector pin which sequentially extends into the plastic part through hole and the plastic part through hole, and a pressing block ejector pin which sequentially extends into the pressing block through hole and the pressing block through hole;

[0008] The pressing block is placed in the pressing block groove and is fixed with a protrusion that can press against the gate piece in the casting groove. The bottom end of the pressing block is provided with a socket connected to the pressing block through hole and a limiting ring is fixed on the inner hole wall of the socket. The top end of the pressing block ejector pin can press against the bottom end of the limiting ring, so that after the plastic part ejector pin ejects the injection molded product in the groove, the pressing block can be ejected using the pressing block ejector pin.

[0009] The beneficial effects of the present invention are as follows: the structural design of the traditional injection molding template is changed. After the injection mold is opened, the finished injection molded product is first ejected by using the plastic part ejector. Since the protrusion is pressed on the gate part, the finished injection molded product and the gate part can be automatically separated. Then, the pressing block is ejected by delaying the ejector pin (first sliding in the socket, when the finished injection molded product and the gate part are automatically separated, the ejector pin of the pressing block contacts the limiting ring and pushes the pressing block upward to move upward, so that the gate part loses its supporting force and separates from the casting groove, thereby completing the demoulding of the gate part.

[0010] Based on the above technical solution, the present invention can also be improved as follows.

[0011] Furthermore, the base includes an upper plate and a lower plate, the top of the lower plate is provided with a lifting groove; the upper plate is placed on the lower plate; the lifting area is the lifting groove; the ejection hole is provided on the lower plate; the plastic part through-hole and the pressing block through-hole are both provided on the upper plate; and the lower template is placed on the upper plate.

[0012] Furthermore, a placement groove is provided on the top surface of the upper plate, and the lower template is placed in the placement groove; the plastic part through-holes and the pressing block through-holes are both provided at the bottom of the placement groove.

[0013] A further beneficial effect of adopting the above method is that placing the lower template in the placement groove can not only improve the stability of the placement of the lower template, but also reduce the overall volume of the injection molding template.

[0014] Furthermore, the molding grooves and the pressing block grooves are two symmetrically arranged, and the casting groove is connected to the two molding grooves.

[0015] Furthermore, the plastic part through-hole, the plastic part through-hole and the plastic part ejector pin are multiple and arranged relatively.

[0016] Furthermore, a conformal groove adapted to the gate piece is provided on the bottom surface of the protrusion. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of a side view of a stereoscopic structure of an in-mold automatic cutting gate device of the present invention;

[0018] Figure 2 It is a top and side perspective structural schematic diagram of an in-mold automatic cutting gate device of the present invention;

[0019] Figure 3 It is a schematic diagram of the top and side views of the structure of an in-mold automatic cutting gate device of the present invention after removing the injection molded product, the gate piece and the pressing block;

[0020] Figure 4 It is a schematic diagram of the side view structure of an ejector plate, a plastic part ejector, a pressing block ejector, an injection molded product, a gate part and a pressing block in an in-mold automatic cutting gate device of the present invention;

[0021] Figure 5 It is a schematic diagram of the top view of the structure of an in-mold automatic cutting gate device of the present invention;

[0022] Figure 6 It is a schematic diagram of the top view of the structure of a pressing block in an in-mold automatic cutting gate device of the present invention;

[0023] Figure 7 The present invention is a schematic diagram of the structure of a pressing block in an automatic in-mold cutting gate device viewed from above.

[0024] In the accompanying drawings, the components represented by the reference numerals are listed as follows:

[0025] 1. Base, 11. Upper plate, 12. Lower plate, 2. Lower template, 21. Groove, 22. Block groove, 23. Casting groove, 24. Plastic through hole, 25. Block through hole, 3. Ejector plate, 4. Block, 41. Socket, 5. Plastic ejector, 6. Block ejector, 7. Bump, 71. Conformal groove, 8. Limiting ring, 9. Gate part, 10. Injection molded product. DETAILED DESCRIPTION

[0026] The principles and features of the present invention are described below in conjunction with the accompanying drawings. The examples given are only used to explain the present invention and are not used to limit the scope of the present invention.

[0027] like Figure 1 , Figure 3 , Figure 4 and Figure 7As shown, an automatic in-mold cutting gate device is installed on an injection mold. The injection mold includes a base 1, a lower mold plate 2, an upper mold plate and an ejector plate 3. The base 1 is provided with a lifting area inside and an ejector hole connected to the lifting area at its bottom end; the lower mold plate 2 is placed on the base 1 and a groove 21 is provided on its top surface; the upper mold plate is placed on the lower mold plate 2 and a casting hole is provided thereon; the ejector plate 3 is placed in the lifting area; an ejector rod is slid in the ejector hole to push the ejector plate 3 to move up and down; it includes: a pressing block 4,

[0028] The top of the base 1 is provided with a plastic part through hole and a pressing block through hole connected to the lifting zone; the top surface of the lower template 2 is provided with a pressing block groove 22 and a casting groove 23 connected to the casting hole and the mold groove 21, the bottom of the mold groove 21 is provided with a plastic part through hole 24 connected to the plastic part through hole, and the bottom of the pressing block groove 22 is provided with a pressing block through hole 25 connected to the pressing block through hole; the top surface of the ejector plate 3 is fixed with a plastic part ejector pin 5 which sequentially extends into the plastic part through hole and the plastic part through hole 24, and a pressing block ejector pin 6 which sequentially extends into the pressing block through hole and the pressing block through hole 25;

[0029] The pressing block 4 is placed in the pressing block groove 22 and is fixed with a protrusion 7 that can press against the gate piece 9 in the casting groove 23. The bottom end of the pressing block 4 is provided with a socket 41 that communicates with the pressing block through hole 25, and a limit ring 8 is fixed on the inner hole wall of the socket 41; the top end of the pressing block ejector pin 6 can press against the bottom end of the limit ring 8, so that after the plastic part ejector pin 5 ejects the injection molded product 10 in the mold groove 21, the pressing block ejector pin 6 can be used to eject the pressing block 4.

[0030] like Figure 1 and Figure 2 As shown, in some specific embodiments, the base 1 may include an upper plate 11 and a lower plate 12, and a lifting groove 121 is provided at the top of the lower plate 12; the upper plate 11 is placed on the lower plate 12; the lifting area is the lifting groove 121; the ejection hole is provided on the lower plate 12; the plastic part perforation and the pressing block perforation are both provided on the upper plate 11; and the lower template 2 is placed on the upper plate 11.

[0031] like Figure 1 and Figure 2 As shown, in some specific embodiments, the top surface of the upper plate 11 may be provided with a placement groove, and the lower template 2 is placed in the placement groove; the plastic part perforations and the pressing block perforations are both provided at the bottom of the placement groove.

[0032] like Figure 1 and Figure 2 As shown, in some specific embodiments, the mold groove 21 and the briquetting groove 22 can be two symmetrically arranged, and the casting groove 23 is connected to the two mold grooves 21.

[0033] Specifically, the plastic part through-hole, the plastic part through-hole 24 and the plastic part ejector pin 5 can be a plurality of relatively arranged ones.

[0034] like Figure 7As shown, in some specific embodiments, the bottom surface of the protrusion 7 may be provided with a conformal groove 71 adapted to the gate member 9 .

[0035] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. An in-mold automatic cutting gate device, installed on an injection mold, the injection mold comprising a base (1), a lower mold plate (2), an upper mold plate and an ejector plate (3), the base (1) is provided with a lifting area inside and an ejector hole connected to the lifting area at its bottom end; the lower mold plate (2) is placed on the base (1) and a groove (21) is provided on its top surface; the upper mold plate is placed on the lower mold plate (2) and a casting hole is provided thereon; the ejector plate (3) is placed in the lifting area; an ejector rod is slid in the ejector hole to push the ejector plate (3) to move up and down; characterized in that include: Briquetting (4), The top of the base (1) is provided with a plastic part through hole and a pressing block through hole communicating with the lifting zone; the top surface of the lower template (2) is provided with a pressing block groove (22) and a casting groove (23) communicating with the casting hole and the molding groove (21); the bottom of the molding groove (21) is provided with a plastic part through hole (24) communicating with the plastic part through hole; the bottom of the pressing block groove (22) is provided with a pressing block through hole (25) communicating with the pressing block through hole; the top surface of the ejector plate (3) is fixed with a plastic part ejector pin (5) extending into the plastic part through hole and the plastic part through hole (24) in sequence, and a pressing block ejector pin (6) extending into the pressing block through hole and the pressing block through hole (25) in sequence; The pressing block (4) is placed in the pressing block groove (22) and is fixed with a protrusion (7) that can press against a gate member (9) in the casting groove (23); the bottom end of the pressing block (4) is provided with a plug hole (41) that communicates with the pressing block through hole (25), and a limit ring (8) is fixed on the inner hole wall of the plug hole (41); the top end of the pressing block ejector pin (6) can press against the bottom end of the limit ring (8), so that after the injection molded product (10) in the molding groove (21) is ejected by the plastic ejector pin (5), the pressing block ejector pin (6) is used to eject the pressing block (4).

2. The in-mold automatic cutting gate device according to claim 1, characterized in that: The base (1) comprises an upper plate (11) and a lower plate (12); a lifting groove (121) is provided at the top of the lower plate (12); the upper plate (11) is placed on the lower plate (12); the lifting area is the lifting groove (121); the ejection hole is provided on the lower plate (12); the plastic part through-hole and the pressing block through-hole are both provided on the upper plate (11); and the lower template (2) is placed on the upper plate (11).

3. The in-mold automatic cutting gate device according to claim 2, characterized in that: The top surface of the upper plate (11) is provided with a placement groove, and the lower template (2) is placed in the placement groove; the plastic part through-holes and the pressing block through-holes are both arranged at the bottom of the placement groove.

4. The in-mold automatic cutting gate device according to claim 1, characterized in that: The molding groove (21) and the pressing block groove (22) are both two symmetrically arranged, and the casting groove (23) is connected to the two molding grooves (21).

5. The in-mold automatic cutting gate device according to claim 1, characterized in that: The plastic part through-holes, the plastic part through-holes (24) and the plastic part ejector pins (5) are all arranged in a plurality relative to each other.

6. The in-mold automatic cutting gate device according to claim 1, characterized in that: The bottom surface of the protrusion (7) is provided with a conformal groove (71) adapted to the gate member (9).

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