Ejection mechanism for injection mold

Abstract

The utility model discloses an ejection mechanism for an injection mold, and relates to the field of injection molds, the ejection mechanism comprises an air valve assembly arranged in a bottom mold, the air valve assembly comprises a valve rod which is located in a second sliding groove and achieves longitudinal sliding, the top of the valve rod is fixedly connected with a valve top, and a conical flaring matched with the valve top in shape is formed in the top of the bottom mold; a cavity communicated with the second sliding groove is formed in the bottom die, a jacking mechanism for driving the valve rod and the valve top to move upwards is arranged in the cavity, and the jacking mechanism comprises a slope block located at the bottom of an inner cavity of the cavity and achieving transverse sliding. According to the device, the valve body is jacked up through the jacking mechanism, the situation that the valve body is jacked up through blowing is avoided, only the mold needs to be jacked up through blowing, and then the air pressure needed by blowing is reduced, so that energy consumption is reduced, and meanwhile the situation that due to unstable air pressure, the gap between the conical flaring and the valve body is too small, the blown air amount is too small, and the mold jacking effect is affected is avoided; and even the mold cannot be jacked up smoothly.

Description

Technical Field

[0001] This application relates to the field of injection molds, and more particularly to an ejection mechanism for injection molds. Background Technology

[0002] Injection molding, also known as injection molding, is a molding method that combines injection and molding. At a certain temperature, plastic material that is completely melted by a screw is injected into the mold cavity under high pressure. After cooling and solidification, a molded product is obtained. After the injection mold is formed, an ejector structure is needed to eject the molded product.

[0003] For example, Chinese patent publication number CN116447326A discloses an air valve device for molds, but it still has the following shortcomings in actual use:

[0004] The aforementioned device moves the valve top by blowing air, creating a gap between the valve top and the top groove. This allows gas to be blown out through the gap, lifting the mold. However, this method requires blowing air to lift the valve body and then the mold. This requires a large air pressure and volume, and the air pressure may be unstable. If the air pressure is too low, the gap between the top groove and the valve top will be too small, resulting in a small amount of air being blown out, which will affect the lifting effect of the mold or even prevent the mold from being lifted smoothly. Utility Model Content

[0005] To address the issues of high energy consumption, unstable air pressure, and impaired mold lifting performance, which could even prevent the mold from lifting smoothly, this application provides an ejection mechanism for injection molds.

[0006] The ejection mechanism for injection molds provided in this application adopts the following technical solution:

[0007] An ejection mechanism for an injection mold includes a valve assembly disposed inside a bottom mold. The valve assembly includes a valve stem located within a second slide groove and capable of longitudinal sliding, with a valve top fixed to its top. The bottom mold has a tapered flared opening at its top that matches the shape of the valve top. The bottom mold has a cavity communicating with the second slide groove. The cavity contains an ejector mechanism that drives the valve stem and valve top to move upward. The ejector mechanism includes an inclined block located at the bottom of the cavity and capable of lateral sliding. A connecting plate is fixed to one side of the valve stem surface, and a push rod is fixed to one side of the connecting plate bottom. The bottom end of the push rod abuts against the inclined surface of the inclined block.

[0008] By adopting the above technical solution, the valve stem and valve top are moved upward by the lifting mechanism. Therefore, the valve top will no longer block and seal the conical flare. There will be a gap between the conical flare and the valve top, avoiding the need to lift the valve body by blowing air. Blowing air only needs to lift the mold, thereby reducing the air pressure required for blowing and thus reducing energy consumption. Moreover, the ejection mechanism can precisely control the displacement of the valve body, ensuring the stability and consistency of each valve body ejection. This ensures that the gap between the conical flare and the valve top is consistent each time, indirectly ensuring that the air volume for lifting the mold is consistent each time. This avoids the gap between the conical flare and the valve top being too small due to unstable air pressure, resulting in too little air volume, which would affect the mold lifting effect or even prevent the mold from being lifted smoothly.

[0009] Preferably, a slider is fixedly connected to the bottom of the inclined block, and a groove adapted to the shape of the slider is opened at the bottom of the cavity. The slider is located in the groove and slides laterally. An electromagnet is fixedly installed on one side of the bottom of the groove.

[0010] By adopting the above technical solution, the slider and the slide groove slide together, and the slide groove can guide the inclined block to slide along a predetermined path, ensuring the accuracy of the sliding and avoiding deviation.

[0011] Preferably, a spring is fixedly connected to one side of the slider, and the other end of the spring is fixedly connected to the inner cavity of the slide groove away from the electromagnet.

[0012] By adopting the above technical solution, the spring can generate a continuous restoring force on the slider. When the slider is subjected to an external force and slides in the groove, when the external force is removed, the elastic force of the spring will push the slider back to its original position.

[0013] Preferably, the electromagnet repels the slider when energized.

[0014] By adopting the above technical solution, when the magnetic field generated by the electromagnet after it is energized interacts with the iron slider, and the magnetic poles of the electromagnet and the magnetic poles of the slider are the same, according to the principle of like poles repelling each other, a repulsive force will be generated between them, and the slider will slide in the direction of the push rod in the first groove.

[0015] Preferably, a sliding rod that movably penetrates the side wall of the connecting plate is fixed between the top and bottom of the cavity, and a spring is sleeved on the surface of the sliding rod, with its top and bottom ends respectively fixed to the top of the cavity and the top of the connecting plate.

[0016] By adopting the above technical solution, the push rod is subjected to an upward thrust, which drives the connecting plate fixed to it to move upward along the slide rod. At the same time, the spring is compressed. When the push rod is no longer subjected to an upward thrust, the elastic force of the spring will push the connecting plate and the push rod back to their original positions.

[0017] Preferably, an air inlet is provided at the bottom of the valve stem, and air outlets are provided on both sides of the top surface of the valve.

[0018] By adopting the above technical solution, gas enters the valve stem and valve top through the air inlet and then exits through the air outlet. The valve top is lifted by the lifting mechanism, which creates a gap between the conical flare and the valve top. Gas is ejected from the gap, lifting the mold.

[0019] Preferably, an air tube is fixedly installed inside the bottom mold, with one end extending to be flush with the bottom of the inner cavity of the second slide groove and the other end extending to the outside.

[0020] By adopting the above technical solution, one end of the air pipe is extended to the outside and connected to an air pump, and the air pump is turned on to supply air.

[0021] Preferably, the bottom mold is provided with a top mold, the bottom of the top mold is fixedly connected with a pair of guide posts, and the top of the bottom mold is fixedly connected with a pair of guide grooves, the guide posts and guide grooves being matched with each other.

[0022] By adopting the above technical solutions, it can be ensured that the top mold and bottom mold can be accurately aligned during the fit, thereby improving the precision and stability of the mold. The fit between the guide pillar and the guide groove can guide the opening and closing action of the mold, making the movement of the mold more stable and smooth.

[0023] In summary, this application includes at least one of the following beneficial technical effects:

[0024] 1. By sliding the inclined block towards the ejector pin, the inclined angle generates an upward component force along the inclined plane. This component force acts on the ejector pin, which is subjected to an upward thrust. As a result, the valve rod and valve top, which are fixed to the ejector pin through the connecting plate, move upward. Therefore, the valve top will no longer block and seal the conical flare. There will be a gap between the conical flare and the valve top, avoiding the need to lift the valve body by blowing air. Blowing air only needs to lift the mold, thereby reducing the air pressure required for blowing and thus reducing energy consumption.

[0025] 2. The ejection mechanism can precisely control the displacement of the valve body, ensuring the stability and consistency of each ejection of the valve body. This, in turn, ensures that the gap between the conical flare and the valve body is consistent each time, indirectly ensuring that the air volume for each mold ejection is consistent. This avoids the gap between the conical flare and the valve body being too small due to unstable air pressure, resulting in insufficient air volume and affecting the mold ejection effect, or even causing the mold to fail to eject smoothly. Attached Figure Description

[0026] Figure 1 This is a schematic diagram of the overall structure of this application;

[0027] Figure 2 This is a schematic diagram of the valve stem and valve top structure of this application;

[0028] Figure 3 This is an enlarged schematic diagram of the structure at point A in the figure;

[0029] Figure 4 This is a schematic diagram of the overall structure of the valve top when it is lifted by the lifting mechanism of this application;

[0030] Figure 5 for Figure 4 Enlarged schematic diagram of the structure at point B.

[0031] Reference numerals: 1. Bottom mold; 2. Guide cylinder; 3. Guide pillar; 4. Top mold; 5. Mold body;

[0032] 6. Valve assembly; 61. Valve top; 62. Valve stem; 63. Inlet / outlet port; 64. Outlet port; 65. Air pipe; 66. Slide groove two; 67. Conical flare;

[0033] 7. Cavity;

[0034] 8. Lifting mechanism; 81. Connecting plate; 82. Slide rod; 83. Spring 2; 84. Top rod; 85. Inclined block; 86. Slide groove 1; 87. Electromagnet; 88. Sliding block; 89. Spring 1; 810. Through hole. Detailed Implementation

[0035] The following is in conjunction with the appendix Figures 1-5 This application will be described in further detail.

[0036] This application discloses an ejection mechanism for injection molds.

[0037] Reference Figure 1 , Figure 2 An ejection mechanism for an injection mold includes a valve assembly 6 disposed inside a bottom mold 1. The valve assembly 6 includes a valve stem 62 located in a second slide groove 66 and capable of longitudinal sliding. The second slide groove 66, which is adapted to the shape of the valve stem 62, is opened in the center of the bottom mold 1. A conical flared opening 67, which communicates with the second slide groove 66, is opened at the top of the bottom mold 1 at a position corresponding to the position of the second slide groove 66. A valve top 61, which is fixedly connected to the top of the valve stem 62, is located inside the conical flared opening 67. The surface of the valve top 61 abuts against the inner surface of the conical flared opening 67. An L-shaped air pipe 65 is inserted into the bottom mold 1. One end of the air pipe 65 extends to be flush with the bottom of the inner cavity of the second slide groove 66. The other end of the air pipe 65, which is away from the second slide groove 66, movably passes through the side wall of the bottom mold 1 and extends to the outside. An air inlet 63 is opened in the center of the bottom of the valve stem 62. A pair of air outlets 64 are symmetrically opened on the left and right sides of the surface of the valve top 61.

[0038] A pair of guide cylinders 2 are symmetrically fixed on both sides of the top of the bottom mold 1. A pair of guide posts 3, which are adapted to the shape of the guide cylinders 2, are fixed at the bottom of the top mold 4 at the position corresponding to the pair of guide cylinders 2. The top mold 4 is installed on the top of the bottom mold 1 by inserting the guide posts 3 into the guide cylinders 2.

[0039] One end of the air pipe 65 is connected to the output end of the air pump, and the air pump is turned on to supply air. The gas enters the inner cavity of the valve stem 62 and the valve top 61 through the air inlet 63, and then exits through the air outlet 64. When the valve top 61 is lifted, the valve top 61 will no longer block and seal the conical flare 67. There will be a gap between the conical flare 67 and the valve top 61, and the gas discharged from the air outlet 64 will be discharged through the gap, pushing the mold body 5 out.

[0040] Reference Figures 3-5 A cavity 7 connected to the second slide groove 66 is opened inside the bottom mold 1. A lifting mechanism 8 is set at the bottom of the cavity 7 and at the position corresponding to the surface of the valve stem 62 in the cavity 7. The lifting mechanism 8 includes an inclined block 85 and a slider 88 is fixedly installed at the bottom of the inclined block 85. A slide groove 86 adapted to the shape of the slider 88 is opened at the bottom of the cavity 7. The inclined block 85 is located in the slide groove 86 through the slider 88 and is laterally slidable at the bottom of the cavity 7. An electromagnet 87 is fixedly installed at the bottom of the slide groove 86 on the side away from the slider 88. When the electromagnet 87 is energized, the magnetic field generated interacts with the iron slider 88. When the magnetic poles of the electromagnet 87 and the magnetic poles of the slider 88 are the same, according to the principle of like poles repulsion, they will generate a repulsive force. A spring 89 is fixedly connected to the center of the side of the slider 88 away from the electromagnet 87. The end of the spring 89 away from the slider 88 is fixedly connected to the side of the slide groove 86 away from the electromagnet 87. The slider 88 is magnetic.

[0041] The connecting plate 81 is fixedly installed on the surface of the valve stem 62 at the position corresponding to the cavity 7. The top of the connecting plate 81 has a through hole 810. The slide rod 82 is slidably installed in the through hole 810. The top and bottom of the slide rod 82 are fixedly installed on the top and bottom of the cavity 7, respectively. The bottom of the push rod 84 is fixedly installed on the side of the bottom of the push rod 84 near the inclined block 85. The bottom end of the push rod 84 abuts against the inclined surface of the inclined block 85. A second spring 83 is sleeved on the surface of the slide rod 82 at the position between the top of the cavity 7 and the top of the connecting plate 81. The top end of the second spring 83 is fixedly connected to the top of the cavity 7, and the bottom end of the second spring 83 is fixedly connected to the top of the connecting plate 81.

[0042] When electromagnet 87 is energized, a repulsive force is generated between electromagnet 87 and slider 88. Under the action of the repulsive force, slider 88 slides away from electromagnet 87 in the groove 86, and at the same time, spring 89 is compressed. As a result, inclined block 85, which is fixed to slider 88, slides in the same direction at the bottom of cavity 7. Due to the inclination angle of the inclined surface, an upward component force is generated along the inclined surface. This component force acts on push rod 84. Push rod 84 is pushed upward, and valve stem 62, which is fixed to push rod 84 through connecting plate 81, and valve top 61 move upward. Therefore, valve top 61 will no longer block and seal conical flare 67, and there will be a gap between conical flare 67 and valve top 61.

[0043] Then, the end of the air pipe 65 extending to the outside is connected to the output end of the air pump, and the air pump is turned on to supply air. The gas enters the inner cavity of the valve stem 62 and the valve top 61 through the air inlet 63, and then is discharged through the air outlet 64. The gas discharged through the air outlet 64 is discharged through the gap, pushing out the mold body 5, thus completing the demolding.

[0044] To avoid lifting the valve body by blowing air, subsequent air blowing only needs to lift the mold body 5, thereby reducing the air pressure required for blowing and thus reducing energy consumption. Furthermore, by ejecting the valve top 61 using the above method, the displacement of the valve body can be precisely controlled, ensuring the stability and consistency of each ejection of the valve top 61. This ensures that the gap between the conical flare 67 and the valve top 61 is consistent each time, indirectly ensuring that the air volume for lifting the mold body 5 is consistent each time. This avoids the gap between the conical flare 67 and the valve top 61 being too small due to unstable air pressure, resulting in insufficient air volume, which would affect the lifting effect of the mold body 5 or even prevent the mold body 5 from being lifted smoothly.

[0045] The implementation principle of an ejection mechanism for an injection mold according to an embodiment of this application is as follows: When the electromagnet 87 is energized, a repulsive force is generated between the electromagnet 87 and the slider 88. Under the action of the repulsive force, the slider 88 slides away from the electromagnet 87 in the slide groove 86, and at the same time, it compresses the spring 89. Consequently, the inclined block 85, which is fixed to the slider 88, slides in the same direction at the bottom of the cavity 7. The ejector rod 84 is subjected to an upward thrust, and the ejector rod 84 is fixed to the connecting plate 81. The valve stem 62 and valve top 61 move upward, so the valve top 61 will no longer block and seal the conical flare 67. There will be a gap between the conical flare 67 and the valve top 61. Then, the end of the air pipe 65 extended to the outside is connected to the output end of the air pump, and the air pump is turned on to supply air. The gas enters the inner cavity of the valve stem 62 and valve top 61 through the air inlet 63, and then exits through the air outlet 64. The gas exiting through the air outlet 64 is discharged through the gap, pushing out the mold body 5, thus completing the demolding.

[0046] When the product is ejected and the air pump stops working, the electromagnet 87 is turned off. The repulsive force between the electromagnet 87 and the slider 88 disappears, and the slider 88 is driven back to its original position under the action of the first spring 89. The inclined block 85 is driven back to its original position, and the thrust of the inclined block 85 on the push rod 84 disappears. Under the action of the second spring 83, the connecting plate 81 and the push rod 84 are driven back to their support positions. The valve stem 62, which is fixed to the connecting plate 81, drives the valve top 61 to return to its original position. After the valve top 61 moves downward, it re-blocks the conical flare 67.

[0047] The above are merely optional embodiments of this disclosure and are not intended to limit this disclosure. Various modifications and variations can be made to this disclosure by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this disclosure should be included within the scope of protection of this disclosure.

Claims

1. An ejection mechanism for an injection mold, comprising a valve assembly (6) disposed inside a bottom mold (1), the valve assembly (6) comprising a valve stem (62) located in a slide groove (66) and capable of longitudinal sliding and having a valve top (61) fixedly connected to its top, the bottom mold (1) having a tapered flared opening (67) at its top adapted to the shape of the valve top (61), characterized in that: The bottom mold (1) has a cavity (7) that communicates with the second slide (66). The cavity (7) is provided with a lifting mechanism (8) that drives the valve stem (62) and valve top (61) to move upward. The lifting mechanism (8) includes an inclined block (85) located at the bottom of the cavity (7) and capable of lateral sliding. A connecting plate (81) is fixedly connected to one side of the surface of the valve stem (62). A top rod (84) with its bottom end abutting against the inclined surface of the inclined block (85) is fixedly connected to one side of the bottom of the connecting plate (81).

2. The ejection mechanism for an injection mold according to claim 1, characterized in that: The bottom of the inclined block (85) is fixedly connected to a slider (88), and the bottom of the cavity (7) is provided with a groove (86) that matches the shape of the slider (88). The slider (88) is located in the groove (86) and slides laterally. An electromagnet (87) is fixedly installed on one side of the bottom of the groove (86).

3. The ejection mechanism for an injection mold according to claim 2, characterized in that: One side of the slider (88) is fixedly connected to a spring (89) whose other end is fixedly connected to the inner cavity of the slide groove (86) away from the electromagnet (87).

4. The ejection mechanism for an injection mold according to claim 3, characterized in that: The electromagnet (87) repels the slider (88) when energized.

5. The ejection mechanism for an injection mold according to claim 1, characterized in that: A sliding rod (82) is fixedly connected between the top and bottom of the cavity (7) and the side wall of the connecting plate (81). A spring (83) is sleeved on the surface of the sliding rod (82), with its top and bottom ends fixed to the top of the cavity (7) and the top of the connecting plate (81) respectively.

6. The ejection mechanism for an injection mold according to claim 1, characterized in that: The valve stem (62) has an air inlet (63) at its bottom and an air outlet (64) on both sides of the valve top (61) surface.

7. The ejection mechanism for an injection mold according to claim 1, characterized in that: An air tube (65) with one end extending to the bottom of the inner cavity of the second slide (66) and the other end extending to the outside is fixedly inserted inside the bottom mold (1).

8. The ejection mechanism for an injection mold according to claim 1, characterized in that: The bottom mold (1) is provided with a top mold (4) at the top. A pair of guide posts (3) are fixedly connected to the bottom of the top mold (4). A pair of guide grooves (2) are fixedly connected to the top of the bottom mold (1). The guide posts (3) and guide grooves (2) are matched with each other.

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