Injection mold stable in discharging

Abstract

The injection mold comprises a front mold body and a rear mold body, the front mold body is used for being installed at an injection molding opening of an injection molding machine, the front mold body comprises a panel and a plate a arranged on the panel, the rear mold body comprises a bottom plate, mold feet arranged on the bottom plate and a plate b arranged on the mold feet, and an ejection mechanism is arranged on the bottom plate; the ejection mechanism comprises an ejector base plate, an ejector retainer plate arranged on the ejector base plate and an ejector pin arranged on the ejector retainer plate, an ejection hole allowing the ejector pin plate to penetrate through is formed in the plate b, and an overstock hole is formed in the bottom plate and used for allowing an ejector rod on the injection molding machine to penetrate through and eject the ejector base plate; return pins are arranged on the ejector retainer plate and located at the two ends of the ejector retainer plate in the length direction, reset holes allowing the return pins to penetrate through are formed in the plate b, and the distance between the return pins and the ejector retainer plate is larger than that between the ejector pins and the ejector retainer plate. The discharging device has the effect that the ejector pin is stably reset so as to improve the discharging stability.

Description

Technical Field

[0001] The present application relates to the field of injection molds, and in particular, to an injection mold with stable blanking. Background Art

[0002] An injection mold is a tool for producing plastic products and also a tool for endowing plastic products with a complete structure and precise dimensions. Injection molding is a processing method used when mass-producing some parts with complex shapes. Specifically, it means injecting the heat-melted plastic into the mold cavity at high pressure by an injection molding machine, and after cooling and solidifying, a formed product is obtained.

[0003] The blanking of common molds is realized by ejector pins. The reset of the ejector pin plate mostly uses a spring for reset. However, ordinary springs are generally applicable to small molds. For the reset of large molds, nitrogen springs are required. However, the manufacturing cost of nitrogen springs is relatively high, they are not resistant to high temperatures, and the installation requirements are relatively high. Therefore, an economical and efficient structure is needed to reset the ejector pin plate. Utility Model Content

[0004] In order to enable the ejector pin to be reset in time to improve the stability of blanking, the present application provides an injection mold with stable blanking.

[0005] An injection mold with stable blanking provided by the present application adopts the following technical solutions:

[0006] An injection mold with stable blanking includes a front mold and a rear mold. The front mold is used to be installed at the injection port of an injection molding machine. The front mold includes a panel and an A plate arranged on the panel. The rear mold includes a bottom plate, mold feet arranged on the bottom plate, and a B plate arranged on the mold feet. A top ejection mechanism is provided on the bottom plate. The top ejection mechanism includes a bottom ejector pin plate, a surface ejector pin plate arranged on the bottom ejector pin plate, and ejector pins arranged on the surface ejector pin plate. A top ejection hole for the ejector pin plate to pass through is opened on the B plate. A pressing hole is opened on the bottom plate. The pressing hole is used for the ejector rod on the injection molding machine to pass through and push the bottom ejector pin plate. Return pins are arranged on the surface ejector pin plate. The return pins are located at both ends in the length direction of the surface ejector pin plate. A reset hole for the return pins to pass through is opened on the B plate. The distance between the return pins and the surface ejector pin plate is greater than the distance between the ejector pins and the surface ejector pin plate.

[0007] By adopting the above technical solution, the ejection mechanism ejects the product through the ejector rod on the injection molding machine. When the mold is opened, the rear mold moves away from the front mold on the injection molding machine. During the movement, the fixed ejector rod on the injection molding machine passes through the extrusion hole, and then pushes the bottom needle plate. While pushing the bottom needle plate, the face needle plate is driven to move. The ejector pins on the face needle plate eject through the ejection holes, thereby ejecting the cooled product for blanking. After that, the injection molding machine closes the rear mold. When the rear mold approaches the front mold, the return pin abuts against the a plate. At this time, the returned return pin drives the face needle plate to reset. The ejector pins on the face needle plate are driven simultaneously, and the ejector pins gradually retract into the b plate until the return pin is pushed to the end and accommodated in the reset hole, and the ejector pins complete the reset. This injection mold with stable blanking drives the ejector pins to retract into the b plate to complete the reset by the way that the return pin abuts against the front mold, replacing the traditional spring reset method and using a mechanical mechanism for reset, preventing the spring from malfunctioning and affecting the reset of the ejector pins and blanking, making the reset of the ejector pins stable, and thus ensuring the stability of blanking.

[0008] Optionally, fixing holes are provided on the face needle plate, and the ejector pins are threadedly connected to the fixing holes to be fixed on the face needle plate.

[0009] By adopting the above technical solution, setting the fixing holes facilitates fixing the ejector pins on the face needle plate, so that when the bottom needle plate is pushed, the face needle plate is driven to move to eject the product with the ejector pins.

[0010] Optionally, through holes are provided at both ends of the face needle plate in the length direction of the face needle plate. Threaded holes are provided on the bottom needle plate. The return pins pass through the through holes and are threadedly connected to the threaded holes to fix the return pins on the bottom needle plate. Limit protrusions are provided on the return pins. When the return pins are fixed in the threaded holes, the limit protrusions abut against the face needle plate.

[0011] By adopting the above technical solution, setting the threaded holes facilitates the threaded holes and the through holes. After the return pins pass through the through holes and are threadedly connected to the threaded holes, the return pins are fixed. The face needle plate is limited and fixed by the limit protrusions on the return pins, so that the face needle plate and the bottom needle plate are fixed as a whole.

[0012] Optionally, guide posts are provided at the four corners of the b plate, and guide grooves for accommodating the guide posts are provided on the a plate.

[0013] By adopting the above technical solution, the guide posts and the guide grooves are provided in cooperation to guide the rear during mold closing, so that the rear mold is stably closed on the front mold.

[0014] Optionally, a molding cavity is provided on the side of the a plate facing the b plate, and a molding protrusion is provided on the side of the b plate facing the a plate. The molding protrusion is accommodated in the molding cavity.

[0015] By adopting the above technical solution, a molding cavity and a molding protrusion are provided and matched with each other. After the mold is closed, the shape of the product is formed in the molding cavity, and it is molded into a plastic molded part after injection molding and cooling.

[0016] Optionally, a positioning ring is provided on the panel, and the positioning ring is used to position the front mold at the injection port.

[0017] By adopting the above technical solution, the positioning ring is set for positioning, which is convenient for installing the front mold at the injection port.

[0018] Optionally, a feeding port is provided at the positioning ring. The feeding port penetrates through the a-plate and the panel, and the feeding port is communicated with the molding cavity.

[0019] By adopting the above technical solution, the feeding port is provided to facilitate the injection molding machine to inject plastic raw materials into the molding cavity.

[0020] Optionally, fixing screws are provided on the bottom plate, and the fixing screws are used to fix the mold feet and the b-plate on the bottom plate.

[0021] By adopting the above technical solution, the fixing screws are set to be threadedly connected with the b-plate after passing through the bottom plate and the mold feet, so as to fix the bottom plate and the mold feet on the b-plate.

[0022] In summary, the present application includes at least one of the following beneficial technical effects:

[0023] 1. The ejection mechanism ejects the product through the ejector rod on the injection molding machine. When the mold is opened, the rear mold moves away from the front mold on the injection molding machine. During the movement, the fixed ejector rod on the injection molding machine passes through the extrusion hole, and then the bottom needle plate is pushed. While pushing the bottom needle plate, the surface needle plate is driven to move. The ejector pins on the surface needle plate eject through the ejection holes, so as to eject the cooled product and make it blank. Then the injection molding machine closes the rear mold. When the rear mold approaches the front mold, the return pin abuts against the a-plate. At this time, the returned return pin drives the surface needle plate to reset. The ejector pins on the surface needle plate are driven simultaneously, and the ejector pins gradually retract into the b-plate until the return pin is pushed to the end and accommodated in the reset hole, and the ejector pins are reset. This injection molding mold with stable blanking drives the ejector pins to retract into the b-plate to complete the reset by the way that the return pin abuts against the front mold, instead of the traditional spring reset method, and uses a mechanical mechanism for resetting, preventing the spring from malfunctioning and affecting the reset of the ejector pins and blanking, making the reset of the ejector pins stable, so as to ensure the stability of blanking;

[0024] 2. The guide posts and guide grooves are provided and matched with each other to guide the rear part during mold closing, so that the rear mold is stably closed on the front mold;

[0025] 3. The positioning ring is provided for positioning, which is convenient for installing the front mold at the injection port. Description of the Drawings

[0026] Figure 1It is a schematic diagram of the overall structure of an injection mold with stable blanking according to an embodiment of the present application.

[0027] Figure 2 It is a schematic structure of the front mold and the rear mold of the embodiment Figure 1 .

[0028] Figure 3 It is an exploded schematic diagram of the ejection mechanism of the embodiment.

[0029] Figure 4 It is a schematic structure of the front mold and the rear mold of the embodiment Figure 2 .

[0030] Explanation of reference numerals: 1, front mold; 101, panel; 102, plate a; 2, rear mold; 201, bottom plate; 202, mold feet; 203, plate b; 3, ejection mechanism; 31, bottom ejector plate; 32, top ejector plate; 33, ejector pin; 4, ejection hole; 5, extrusion hole; 6, return pin; 7, reset hole; 8, fixing hole; 9, through hole; 10, threaded hole; 11, limiting protrusion; 12, guide pillar; 13, guide groove; 14, molding cavity; 15, molding protrusion; 16, positioning ring; 17, feeding port; 18, fixing screw. Specific embodiments

[0031] The following is a further detailed description of the present application in conjunction with the attached Figures 1-4 drawings.

[0032] An embodiment of the present application discloses an injection mold with stable blanking. Refer to Figure 1 , the injection mold with stable blanking includes a front mold 1 and a rear mold 2. The front mold 1 is used to be installed at the injection port of an injection molding machine. The front mold 1 includes a panel 101 and a plate a 102 fixed on the panel 101. The rear mold 2 includes a bottom plate 201, mold feet 202 installed on the bottom plate 201, and a plate b 203 installed on the mold feet 202.

[0033] Refer to Figure 2 and Figure 3The bottom plate 201 is provided with an ejection mechanism 3, which includes a bottom needle plate 31, a face needle plate 32 installed on the bottom needle plate 31, and an ejector pin 33 installed on the face needle plate 32. The b plate 203 is provided with an ejection hole 4 for the ejector pin 33 to pass through. The face needle plate 32 is provided with a return pin 6, which is located at both ends of the face needle plate 32 in the length direction. The b plate 203 is provided with a reset hole 7 for the return pin 6 to pass through. The distance between the return pin 6 and the face needle plate 32 is greater than the distance between the ejector pin 33 and the face needle plate 32. The face needle plate 32 is provided with a fixing hole 8, and the ejector pin 33 is threadedly connected in the fixing hole 8 to be fixed to the face needle plate 32. The face needle plate 32 is provided with through holes 9, which are located at both ends of the face needle plate 32 in the length direction. The bottom needle plate 31 is provided with threaded holes 10. The return pin 6 passes through the through holes 9 and is threadedly connected to the threaded holes 10 so that the return pin 6 is fixed to the bottom needle plate 31. The return pin 6 is integrally fixed with a limiting protrusion 11. When the return pin 6 is fixed in the threaded hole 10, the limiting protrusion 11 is pressed against the face needle plate 32.

[0034] Reference Figure 2 and Figure 4 , guide pillars 12 are fixed on the four corners of the b plate 203, and a guide groove 13 for accommodating the guide pillars 12 is provided on the a plate 102. A molding cavity 14 is provided on the side of the a plate 102 facing the b plate 203, and a molding protrusion 15 is fixed on the side of the b plate 203 facing the a plate 102, and the molding protrusion 15 is accommodated in the molding cavity 14. A positioning ring 16 is fixed on the side of the panel 101 away from the a plate 102, and the positioning ring 16 is used to position the front mold 1 at the injection port. A feed port 17 is provided at the positioning ring 16, and the feed port 17 passes through the panel 101 and the a plate 102, and the feed port 17 is connected to the molding cavity 14. A fixing screw 18 is installed on the bottom plate 201, and the fixing screw 18 is used to fix the mold foot 202 and the b plate 203 on the bottom plate 201. The bottom plate 201 is provided with a backlog hole 5, which is used for the ejector rod on the injection molding machine to pass through and push the bottom needle plate 31.

[0035] The implementation principle of an injection mold with stable blanking in an embodiment of the present application is as follows: The ejection mechanism 3 ejects the product through the ejector rod on the injection molding machine. When the mold is opened, the rear mold 2 moves away from the front mold 1 on the injection molding machine. During the movement, the fixed ejector rod on the injection molding machine passes through the extrusion hole 5, and then pushes the bottom needle plate 31. While pushing the bottom needle plate 31, the surface needle plate 32 is driven to move. The ejector pin 33 on the surface needle plate 32 ejects through the ejection hole 4, so as to eject the cooled product and make it blank. After that, the injection molding machine closes the rear mold 2. When the rear mold 2 approaches the front mold 1, the return pin 6 abuts against the a plate 102. At this time, the returned return pin 6 drives the surface needle plate 32 to reset. The ejector pin 33 on the surface needle plate 32 is driven simultaneously. The ejector pin 33 gradually retracts into the b plate 203 until the return pin 6 is pushed into and accommodated in the reset hole 7, and the ejector pin 33 completes the reset. The injection mold with stable blanking drives the ejector pin 33 to retract into the b plate 203 to complete the reset by the way that the return pin 6 abuts against the front mold 1. Instead of the traditional spring reset method, a mechanical mechanism is used for resetting, preventing the spring from malfunctioning and affecting the reset of the ejector pin 33 and blanking, making the reset of the ejector pin 33 stable, so as to ensure the stability of blanking.

[0036] The above are all the preferred embodiments of the present application, and the protection scope of the present application is not limited thereby. Therefore, all equivalent changes made according to the structure, shape, and principle of the present application shall be covered within the protection scope of the present application.

Claims

1. An injection mold with stable material discharge, comprising a front mold (1) and a rear mold (2), wherein the front mold (1) is used to be installed at the injection port of an injection molding machine, the front mold (1) comprises a panel (101) and an a plate (102) arranged on the panel (101), and the rear mold (2) comprises a bottom plate (201), a mold foot (202) arranged on the bottom plate (201) and a b plate (203) arranged on the mold foot (202), characterized in that: The bottom plate (201) is provided with an ejection mechanism (3), the ejection mechanism (3) comprising a bottom needle plate (31), a face needle plate (32) arranged on the bottom needle plate (31) and an ejector pin (33) arranged on the face needle plate (32); the b plate (203) is provided with an ejection hole (4) for the ejector pin (33) to pass through; the bottom plate (201) is provided with a backfill hole (5), the backfill hole (5) is used for the ejector rod on the injection molding machine to pass through and push the bottom needle plate (31); the face needle plate (32) is provided with a return pin (6), the return pin (6) is located at both ends of the face needle plate (32) in the length direction; the b plate (203) is provided with a reset hole (7) for the return pin (6) to pass through, and the distance between the return pin (6) and the face needle plate (32) is greater than the distance between the ejector pin (33) and the face needle plate (32).

2. The injection mold with stable material feeding according to claim 1, characterized in that: The face needle plate (32) is provided with a fixing hole (8), and the ejector pin (33) is threadedly connected in the fixing hole (8) to be fixed to the face needle plate (32).

3. The injection mold with stable material feeding according to claim 2, characterized in that: The surface needle plate (32) is provided with a through hole (9), and the through holes (9) are located at both ends of the surface needle plate (32) in the length direction. The bottom needle plate (31) is provided with a threaded hole (10). The return pin (6) passes through the through hole (9) and is threadedly connected to the threaded hole (10) so that the return pin (6) is fixed to the bottom needle plate (31). The return pin (6) is provided with a limiting protrusion (11). When the return pin (6) is fixed in the threaded hole (10), the limiting protrusion (11) is pressed against the surface needle plate (32).

4. The injection mold with stable material feeding according to claim 3, characterized in that: Guide pillars (12) are provided on the four corners of the b plate (203), and guide grooves (13) for accommodating the guide pillars (12) are provided on the a plate (102).

5. The injection mold with stable material feeding according to claim 1, characterized in that: A molding cavity (14) is provided on the side of the a plate (102) facing the b plate (203), and a molding protrusion (15) is provided on the side of the b plate (203) facing the a plate (102), wherein the molding protrusion (15) is accommodated in the molding cavity (14).

6. The injection mold with stable material feeding according to claim 1, characterized in that: The panel (101) is provided with a positioning ring (16), and the positioning ring (16) is used to position the front mold (1) at the injection port.

7. The injection mold with stable material feeding according to claim 6, characterized in that: The positioning ring (16) is provided with an inlet (17), the inlet (17) passes through the a-plate (102) and the panel (101), and the inlet (17) is in communication with the molding cavity (14).

8. The injection mold with stable material feeding according to claim 1, characterized in that: The bottom plate (201) is provided with a fixing screw (18), and the fixing screw (18) is used to fix the mold foot (202) and the b-plate (203) on the bottom plate (201).

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