Ejection mechanism of injection mold

Abstract

The utility model relates to the technical field of injection molds, in particular to an ejection mechanism of an injection mold. According to the technical scheme, the mold comprises a mold body, a transmission box and a piston seat, the mold body is fixedly installed at the top of the transmission box, a two-way lead screw is rotatably installed in the transmission box, a threaded sleeve is installed at the top of the two-way lead screw in a threaded mode, a movable groove is formed in the mold body, and the piston seat is slidably installed in the movable groove; a sliding column is installed in the piston seat in a penetrating mode, a sealing disc is fixedly installed at the top of the sliding column, and an ejection disc is fixedly connected to the top of the sealing disc. According to the utility model, the piston seat, the movable groove and the ventilation cavity are matched with each other, so that the situation that a plastic part is adhered and torn can be effectively avoided, and the ejection disc, the sealing disc, the limiting groove and the sealing groove are matched with each other, so that the sealing effect is improved through a dual-sealing effect. And the situation that pouring materials in the injection molding cavity leak can be effectively avoided.

Description

Technical Field

[0001] The utility model relates to the technical field of injection molds, in particular to an ejection mechanism of an injection mold. Background Art

[0002] At present, in the production process of plastic products, injection molds are usually needed to perform molding operations on plastic products. Injection molds are tools for producing plastic products and are also tools that give plastic products complete structures and precise dimensions. After injection molding is completed using the injection mold, the molded plastic parts need to be demolded. Among them, the "ejection mechanism of an injection mold" disclosed by the authorization announcement number "CN211763019U" has solved the problems that the ejector rod will be damaged during the long-term production process of the mold, resulting in a short service life of the ejector rod and high operation and maintenance costs. In addition, the contact area between the existing ejector molding molds is too small, and it is not easy to eject the molding mold. After further retrieval, it was found that the authorization announcement number "C N215472853U” discloses “an ejection mechanism for an injection mold”, which, through a specific technical structure setting, effectively solves the technical drawbacks that due to the gap between the product and the bottom surface of the material cavity, the overflow material will remain around the concave hole, resulting in the difficulty of placing the product stably during the next cutting process. However, in actual use, the ejection mechanism of the injection mold with a similar structure still has many defects, such as: after the injection molding is completed, the plastic part will adhere to the injection cavity, and when the plastic part is directly ejected by the ejection mechanism, it will cause the plastic part to tear, reducing the ejection effect. At the same time, the sealing of most ejection structures is relatively general, which is easy to cause leakage when the casting material is introduced into the injection cavity. Therefore, it is necessary to design an ejection mechanism for the injection mold. Utility Model Content

[0003] The purpose of the utility model is to provide an ejection mechanism for an injection mold to solve the problems raised in the above background technology.

[0004] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: an ejection mechanism of an injection mold, comprising a mold body, a transmission box, a sealing seat and a piston seat, the mold body is fixedly installed on the top of the transmission box, a bidirectional screw is rotatably installed inside the transmission box, a threaded sleeve is threadedly installed on the top of the bidirectional screw, a movable groove is opened inside the mold body, a piston seat is slidably installed inside the movable groove, a sliding column is installed inside the piston seat, a sealing disk is fixedly installed on the top of the sliding column, an ejection disk is fixedly connected to the top of the sealing disk, and ventilation cavities are opened in the mold body on both sides of the movable groove.

[0005] By driving the rotation of the two-way screw rod, the piston seat can be pushed to slide upward along the movable groove. When the piston seat moves upward, the air in the movable groove can be pressed to move upward, and the air pressure can be used to push the sealing plate and the ejector plate to move upward. The sliding column can slide along the piston seat to prevent the sealing plate and the ejector plate from being skewed. When the sealing plate and the ejector plate move upward, they can be separated from the sealing groove and the limiting groove, so that the air in the movable groove can pass into the interior of the injection cavity, and the airflow can be evenly distributed on the inner wall of the injection cavity, so that the adhesion between the plastic part and the injection cavity can be separated. The piston seat continues to move upward and contact with the sealing plate, which can drive the ejector plate to continue to move upward, so that the plastic part in the injection cavity can be ejected for demolding, which can effectively avoid the adhesion and tearing of the plastic parts.

[0006] Preferably, a motor is fixedly mounted on the top of the inner wall of the transmission box, and the output end of the motor and the bidirectional screw rod are installed via a belt transmission. The motor can drive the bidirectional screw rod to rotate using the belt.

[0007] Preferably, a fixed column is fixedly installed at the bottom of the piston seat, and a movable rod is movably connected between the fixed column and the threaded sleeve. The two-way screw rod and the threaded sleeve are threadedly engaged, which can drive the two sets of threaded sleeves to move relative to each other. When the threaded sleeves are driven to move relative to each other, the two movable rods can be driven to move together, and the piston seat can be supported by the fixed column to slide upward along the movable groove.

[0008] Preferably, an injection cavity is provided at the top of the mold body, and a limiting groove corresponding to the ejector plate is provided at the bottom of the injection cavity. By injecting the casting material into the injection cavity, the plastic part can be easily molded, and by fitting the ejector plate into the limiting groove, the ejector plate can be fitted with the bottom of the injection cavity, so that a primary seal can be easily performed.

[0009] Preferably, a sealing groove corresponding to the sealing disc is formed at the bottom of the limit groove, and a reset spring is fixedly connected between the sealing disc and the sealing groove. The sealing disc is embedded in the sealing groove, which can effectively perform secondary sealing. Through the double sealing effect, the casting material in the injection cavity can be effectively prevented from leaking. The reset spring can pull the sealing disc back to the sealing groove to seal.

[0010] Preferably, a sealing block is fixedly mounted on the inner wall of the ventilation cavity, and a sealing seat is movably connected between the sealing blocks. When the piston seat moves upward, the air in the movable groove can be pressed upward, and at this time, the pressure will push the sealing seat and the sealing block to fit together for sealing, so that the air in the movable groove will not flow out through the ventilation cavity.

[0011] Preferably, the sealing seat and the sealing block are movably mounted via a tension spring, and the two ends of the tension spring are fixedly connected to the sealing seat and the sealing block respectively. When the air pressure inside the movable groove is balanced with the outside, the tension spring can pull the sealing seat and the sealing block to engage for sealing, making it convenient to squeeze the air in the movable groove into the injection cavity for demoulding operation next time.

[0012] Compared with the prior art, the beneficial effects of the utility model are:

[0013] 1. By setting the piston seat, the movable groove and the ventilation cavity to cooperate with each other, when the piston seat moves upward, the air in the movable groove can be squeezed upward, so that the air can push the sealing plate and the ejection plate out a certain distance, so that the air can enter the bottom of the injection cavity, and the air flow can be evenly distributed on the inner wall of the injection cavity, so that the adhesion between the plastic part and the injection cavity can be separated, and then the ejection plate can be used to eject the plastic part, which can effectively avoid the adhesion and tearing of the plastic part.

[0014] 2. By providing the ejector plate, the sealing plate, the limit groove and the sealing groove, the ejector plate can be embedded in the limit groove, so that the ejector plate can be fitted with the bottom of the injection cavity, which can facilitate primary sealing. By embedding the sealing plate in the sealing groove, secondary sealing can be effectively performed. The double sealing effect can effectively prevent the casting material in the injection cavity from leaking. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 This is a schematic diagram of the main cross-sectional structure of the utility model;

[0016] Figure 2 This is a cross-sectional view of the mold body of the utility model;

[0017] Figure 3 It is a schematic diagram of the ejector plate structure of the utility model;

[0018] Figure 4 This is a schematic diagram of the sealing seat structure of the utility model;

[0019] Figure 5 This is a schematic diagram of the piston seat structure of the utility model.

[0020] In the figure: 1. mold body; 101. injection cavity; 102. ventilation cavity; 103. limit groove; 104. sealing groove; 105. movable groove; 2. transmission box; 3. motor; 301. belt; 4. bidirectional screw; 401. threaded sleeve; 5. movable rod; 6. piston seat; 601. fixed column; 7. ejector plate; 701. sealing plate; 702. return spring; 703. sliding column; 8. sealing seat; 801. sealing block; 802. tension spring. DETAILED DESCRIPTION

[0021] The technical solution of the utility model is further described below in conjunction with the accompanying drawings and specific embodiments.

[0022] Embodiment 1

[0023] like Figure 1 , Figure 2 , Figure 3 , Figure 4 and Figure 5 As shown, the utility model proposes an ejection mechanism of an injection mold, comprising a mold body 1, a transmission box 2 and a piston seat 6, the mold body 1 is fixedly installed on the top of the transmission box 2, a bidirectional screw rod 4 is rotatably installed inside the transmission box 2, a threaded sleeve 401 is threadedly installed on the top of the bidirectional screw rod 4, a movable groove 105 is opened inside the mold body 1, a piston seat 6 is slidably installed inside the movable groove 105, a sliding column 703 is installed through the inside of the piston seat 6, a sealing disk 701 is fixedly installed on the top of the sliding column 703, and an ejection disk 7 is fixedly connected to the top of the sealing disk 701, and ventilation cavities 102 are opened in the mold body 1 on both sides of the movable groove 105;

[0024] A fixing column 601 is fixedly installed at the bottom of the piston seat 6, and a movable rod 5 is movably connected between the fixing column 601 and the threaded sleeve 401, an injection cavity 101 is opened at the top of the mold body 1, and a limiting groove 103 corresponding to the ejection disk 7 is opened at the bottom of the injection cavity 101, a sealing groove 104 corresponding to the sealing disk 701 is opened at the bottom of the limiting groove 103, and a return spring 702 is fixedly connected between the sealing disk 701 and the sealing groove 104, a sealing block 801 is fixedly installed on the inner wall of the ventilation cavity 102, and a sealing seat 8 is movably connected between the sealing blocks 801.

[0025] The working principle of the ejection mechanism of the injection mold according to the first embodiment is as follows: by injecting the casting material into the injection cavity 101, the plastic part can be conveniently molded; by the ejection plate 7 being embedded in the limiting groove 103, the ejection plate 7 can be fitted with the bottom of the injection cavity 101, which can facilitate primary sealing; by the sealing plate 701 being embedded in the sealing groove 104, secondary sealing can be effectively performed; and by the double sealing effect, leakage of the casting material in the injection cavity 101 can be effectively avoided;

[0026] When demoulding, by driving the rotation of the bidirectional screw rod 4, the bidirectional screw rod 4 and the threaded sleeve 401 are threadedly engaged, which can drive the two sets of threaded sleeves 401 to move relative to each other. By driving the threaded sleeves 401 to move relative to each other, the two movable rods 5 can be driven to move together, and the piston seat 6 can be supported by the fixed column 601 to slide upward along the movable groove 105. When the piston seat 6 moves upward, it can press the air in the movable groove 105 to move upward. At this time, the pressure will push the sealing seat 8 to fit the sealing block 801 to seal, so that the air in the movable groove 105 will not flow out through the ventilation cavity 102;

[0027] When the air is pushed upward by the piston seat 6, the air pressure can be used to push the sealing plate 701 and the ejection plate 7 to move upward, and the sliding column 703 can slide along the piston seat 6, so that the sealing plate 701 and the ejection plate 7 will not be skewed. When the sealing plate 701 and the ejection plate 7 move upward, they can be separated from the sealing groove 104 and the limiting groove 103, so that the air in the movable groove 105 can pass into the interior of the injection cavity 101, and the air flow can be evenly distributed on the inner wall of the injection cavity 101, so that the adhesion between the plastic part and the injection cavity 101 can be separated, and the piston seat 6 continues to move upward to contact the sealing plate 701, which can drive the ejection plate 7 to continue to move upward, so that the plastic part in the injection cavity 101 can be ejected for demoulding operation conveniently, and the adhesion and tearing of the plastic part can be effectively avoided;

[0028] After the plastic in the injection cavity 101 is demoulded, the bidirectional screw rod 4 is driven to rotate in the opposite direction, which can drive the two sets of threaded sleeves 401 to rotate with each other, and can drive the movable rod 5 to expand, and can pull the piston seat 6 to move downward along the movable groove 105. The sealing disk 701 can be pulled back to the sealing groove 104 through the action of the reset spring 702 to seal.

[0029] By continuing to move the piston seat 6 downward, negative pressure is formed in the movable groove 105, allowing external air to enter the ventilation cavity 102, pushing the sealing seat 8 and the sealing block 801 to separate, allowing air to enter the movable groove 105. When the air pressure inside the movable groove 105 is balanced with the external pressure, the sealing seat 8 can automatically reset.

[0030] Embodiment 2

[0031] like Figure 1 and Figure 4As shown, the utility model proposes an ejection mechanism of an injection mold. Compared with the first embodiment, this embodiment also includes: a motor 3 is fixedly installed on the top of the inner wall of the transmission box 2, and the output end of the motor 3 and the bidirectional screw 4 are installed through a belt 301 for transmission, and the sealing seat 8 and the sealing block 801 are movably installed through a tension spring 802, and the two ends of the tension spring 802 are fixedly connected to the sealing seat 8 and the sealing block 801 respectively.

[0032] In this embodiment, Figure 1 As shown, the motor 3 can use the belt 301 to drive the bidirectional screw rod 4 to rotate; Figure 4 As shown, when the air pressure inside the movable groove 105 is balanced with the outside, the tension spring 802 can pull the sealing seat 8 to engage with the sealing block 801 for sealing, making it convenient to squeeze the air in the movable groove 105 into the injection cavity 101 for demolding operation next time.

[0033] The above-mentioned specific embodiments are only several preferred embodiments of the present invention. Based on the technical solution of the present invention and the relevant inspiration of the above-mentioned embodiments, those skilled in the art can make various alternative improvements and combinations to the above-mentioned specific embodiments.

Claims

1. An ejection mechanism for an injection mold, comprising a mold body (1), a transmission box (2) and a piston seat (6), characterized in that: The top of the transmission box (2) is fixedly mounted with a mold body (1), a bidirectional screw rod (4) is rotatably mounted inside the transmission box (2), a threaded sleeve (401) is threadedly mounted on the top of the bidirectional screw rod (4), a movable groove (105) is provided inside the mold body (1), a piston seat (6) is slidably mounted inside the movable groove (105), a sliding column (703) is installed through the inside of the piston seat (6), a sealing disk (701) is fixedly mounted on the top of the sliding column (703), an ejection disk (7) is fixedly connected to the top of the sealing disk (701), and ventilation cavities (102) are provided in the mold body (1) on both sides of the movable groove (105).

2. The ejection mechanism of an injection mold according to claim 1, characterized in that: A motor (3) is fixedly mounted on the top of the inner wall of the transmission box (2), and the output end of the motor (3) and the bidirectional screw rod (4) are driven and mounted via a belt (301).

3. The ejection mechanism of an injection mold according to claim 1, characterized in that: A fixing column (601) is fixedly mounted on the bottom of the piston seat (6), and a movable rod (5) is movably connected between the fixing column (601) and the threaded sleeve (401).

4. The ejection mechanism of an injection mold according to claim 1, characterized in that: An injection cavity (101) is provided at the top of the mold body (1), and a limiting groove (103) corresponding to the ejection plate (7) is provided at the bottom of the injection cavity (101).

5. The ejection mechanism of an injection mold according to claim 4, characterized in that: A sealing groove (104) corresponding to the sealing disk (701) is provided at the bottom of the limiting groove (103), and a return spring (702) is fixedly connected between the sealing disk (701) and the sealing groove (104).

6. The ejection mechanism of an injection mold according to claim 1, characterized in that: A sealing block (801) is fixedly mounted on the inner wall of the ventilation cavity (102), and a sealing seat (8) is movably connected between the sealing blocks (801).

7. The ejection mechanism of an injection mold according to claim 6, characterized in that: The sealing seat (8) and the sealing block (801) are movably mounted via a tension spring (802), and the two ends of the tension spring (802) are fixedly connected to the sealing seat (8) and the sealing block (801) respectively.

Images