Automatic ejection device for an injection molding machine

Abstract

The utility model relates to the field of ejection device, concretely to automatic ejection device of injection molding machine, including the casing, is seted up with the adjusting groove in the casing, is seted up with the cylinder mounting groove at the center of adjusting groove bottom, is fixedly installed with the cylinder in the cylinder mounting groove, still include: support plate, support plate fixed mounting is on the cylinder piston rod upper end, support plate side wall fixed mounting has a plurality of connecting rods, support plate upper surface fixed mounting has main installation shaft, and the main installation shaft upper surface is seted up with main telescopic groove. In the utility model, through the cylinder to push support plate upward, first sealing washer and second sealing washer prevent plastic flash or chippings to enter the ejection mechanism, reduce the friction jam, improved the sealing performance when the equipment operation, reduced the possibility that the outside dust or other impurities entered the system inside, prolonged the equipment life, and provided better sealing effect in the ejection process, prevent leakage, prevent the first mounting plate and second mounting plate edge place scratch product surface simultaneously.

Description

Technical Field

[0001] This utility model relates to the field of ejection devices, and more particularly to an automatic ejection device for an injection molding machine. Background Technology

[0002] Injection molding machines are core equipment in plastic processing, primarily used to inject molten plastic into a mold cavity, where it cools and solidifies to form plastic products. Injection molding machines can quickly and continuously produce large quantities of complex-shaped plastic products with high precision requirements, suitable for manufacturing various types of plastic products, such as automotive parts, appliance housings, electronic device housings, and toys. By precisely controlling temperature, pressure, and time parameters, injection molding machines ensure consistent dimensions and appearance for each product. During injection molding, after the plastic product cools and solidifies, it typically adheres tightly to the inner surface of the mold cavity. Due to friction between the plastic part and the mold, and the potential vacuum effect, gravity alone cannot allow the finished product to detach naturally. Therefore, an ejector device is needed to help push the finished product out of the mold. The ejector device automatically pushes the plastic product out of the mold after mold opening. By applying a uniform ejection force, it avoids deformation, cracks, or other defects caused by localized stress concentration, ensuring product integrity and aesthetics, improving yield, and reducing mold wear and preventing mold damage caused by improper ejection. Precise control of ejection force and stroke avoids quality problems caused by uneven ejection, ensuring that every product meets high quality standards. A well-designed ejection device can effectively reduce the failure rate, lower maintenance costs, and improve the stability and reliability of the equipment.

[0003] Chinese Patent No. CN221584411 U discloses an ejection device for an injection molding machine. It achieves uniform ejection force distribution through multiple evenly distributed ejector rods. However, when ejecting molded products, there is a problem that the product surface is easily damaged during ejection. In view of this, an automatic ejection device for an injection molding machine is provided. Utility Model Content

[0004] The main purpose of this utility model is to provide an automatic ejection device for injection molding machines to solve the problem in related technologies that the product surface is easily damaged during ejection.

[0005] To achieve the above objectives, according to one aspect of this utility model, an automatic ejection device for an injection molding machine is provided, comprising a housing, an adjustment groove inside the housing, a cylinder mounting groove at the center of the bottom surface of the adjustment groove, a cylinder being fixedly installed in the cylinder mounting groove, and a support plate fixedly installed on the upper end of the cylinder piston rod. A plurality of connecting rods are fixedly installed on the side wall of the support plate. A main mounting shaft is fixedly installed on the upper surface of the support plate, a main telescopic groove is formed on the upper surface of the main mounting shaft, a main connecting shaft is slidably installed in the main telescopic groove, a first mounting plate is fixedly installed on the upper surface of the main connecting shaft, a plurality of secondary mounting shafts are fixedly installed on the upper surface of the connecting rods, secondary mounting shafts are formed on the upper surface of the secondary mounting shafts, secondary connecting shafts are slidably installed in the secondary telescopic grooves, and a second mounting plate is fixedly installed on the upper surface of the secondary connecting shafts. The injection-molded product is ejected through the first and second mounting plates.

[0006] Furthermore, a main ejector groove with a connecting adjustment groove is provided at the center of the upper surface of the housing, and several secondary ejector grooves are provided in a ring array on the upper surface of the housing.

[0007] Furthermore, a first support spring is fixedly installed at the bottom of the main telescopic groove, and the other end of the first support spring is fixedly installed on the lower surface of the main connecting shaft.

[0008] Furthermore, a second support spring is fixedly installed at the bottom of the secondary telescopic groove, and the other end of the second support spring is fixedly installed on the lower surface of the secondary connecting shaft.

[0009] Furthermore, the plurality of connecting rods are fixedly installed in a circular array on the side wall of the support plate, and a connecting ring is fixedly installed at one end of each connecting rod.

[0010] Furthermore, the radius of the main mounting shaft is larger than that of the secondary mounting shaft, and the secondary mounting shafts are fixedly installed in a ring array around the main mounting shaft.

[0011] Furthermore, a first sealing ring is fixedly installed at the edge of the first mounting plate.

[0012] Furthermore, a second sealing ring is fixedly installed at the edge of the second mounting plate.

[0013] Compared with the prior art, the present invention has the following beneficial effects:

[0014] In this invention, a cylinder pushes a support plate upward. Several connecting rods are fixedly mounted in a circular array on the sidewall of the support plate. A connecting ring is fixedly mounted at one end of each connecting rod. A main mounting shaft is fixedly mounted at the center of the upper surface of each connecting rod, and several secondary mounting shafts are fixedly mounted on the upper surface of the connecting rod. These secondary mounting shafts are fixedly mounted in a circular array around the main mounting shaft. When the support plate moves upward, the first and second mounting plates pass through the main ejection groove and secondary ejection groove, respectively, pushing the injection-molded product upward. The first and second support springs absorb ejection vibrations, preventing hard contact that could scratch the product surface and preventing excessive instantaneous thrust. Simultaneously, they can adaptively adjust to minor unevenness on the product surface, ensuring that appropriate ejection force is applied to each contact point, preventing product jamming. The mounting shaft is located in the center, and the secondary mounting shafts are distributed in a ring array around it, providing more uniform support force during the ejection process. This enables multi-point synchronous ejection, ensuring that the product remains balanced as it leaves the mold and reducing warping or cracking caused by single-point ejection. The first and second mounting plates increase the contact area, reducing stress concentration and preventing product damage. The first and second sealing rings prevent plastic flash or debris from entering the ejection mechanism, reducing friction and jamming, improving the sealing performance during equipment operation, reducing the possibility of external dust or other impurities entering the system, extending the equipment's service life, and providing a better sealing effect during ejection to prevent leakage. At the same time, it prevents the edges of the first and second mounting plates from scratching the product surface. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the installation structure of the ejector device in a preferred embodiment of the present invention;

[0016] Figure 2 This is a schematic cross-sectional view of the shell structure in a preferred embodiment of the present invention;

[0017] Figure 3 This is a schematic diagram of the shell structure in a preferred embodiment of the present invention;

[0018] Figure 4 This is a schematic diagram of the ejection device structure in a preferred embodiment of the present invention;

[0019] Figure 5 This is a cross-sectional view of the support plate in a preferred embodiment of the present invention.

[0020] Figure label:

[0021] 1. Housing; 11. Adjustment groove; 12. Main ejector groove; 111. Cylinder mounting groove; 121. Secondary ejector groove;

[0022] 2. Cylinder; 21. Support plate; 22. Main mounting shaft; 23. Secondary mounting shaft; 211. Connecting rod; 212. Connecting ring; 221. Main telescopic groove; 222. Main connecting shaft; 223. First support spring; 224. First mounting plate; 225. First sealing ring; 231. Secondary telescopic groove; 232. Secondary connecting shaft; 233. Second support spring; 234. Second mounting plate; 235. Second sealing ring. Detailed Implementation

[0023] To further illustrate the technical means and effects adopted by this utility model in order to achieve the intended utility model purpose, the following detailed description of the specific implementation methods, structure, features and effects of this utility model is provided in conjunction with the accompanying drawings and preferred embodiments.

[0024] This embodiment provides an automatic ejection device for an injection molding machine, including a housing 1. An adjustment groove 11 is provided inside the housing 1. A cylinder mounting groove 111 is provided at the center of the bottom surface of the adjustment groove 11, and a cylinder 2 is fixedly installed in the cylinder mounting groove 111. The device also includes a support plate 21, which is fixedly installed on the upper end of the piston rod of the cylinder 2. Several connecting rods 211 are fixedly installed on the side wall of the support plate 21. A main mounting shaft 22 is fixedly installed on the upper surface of the support plate 21, and a main telescopic groove 2 is provided on the upper surface of the main mounting shaft 22. 21. A main connecting shaft 222 is slidably installed in the main telescopic groove 221. A first mounting plate 224 is fixedly installed on the upper surface of the main connecting shaft 222. Several secondary mounting shafts 23 are fixedly installed on the upper surface of the connecting rod 211. A secondary telescopic groove 231 is opened on the upper surface of the secondary mounting shaft 23. A secondary connecting shaft 232 is slidably installed in the secondary telescopic groove 231. A second mounting plate 234 is fixedly installed on the upper surface of the secondary connecting shaft 232. The injection-molded product is ejected through the first mounting plate 224 and the second mounting plate 234.

[0025] like Figure 1 , Figure 3 As shown, a main ejector groove 12 with a connecting adjustment groove 11 is provided at the center of the upper surface of the housing 1, and a number of secondary ejector grooves 121 are provided in a ring array on the upper surface of the housing 1. The first mounting plate 224 and the second mounting plate 234 pass through the main ejector groove 12 and the secondary ejector grooves 121 respectively to push the injection-molded product upward.

[0026] like Figure 5 As shown, a first support spring 223 is fixedly installed at the bottom of the main telescopic groove 221, and the other end of the first support spring 223 is fixedly installed on the lower surface of the main connecting shaft 222.

[0027] like Figure 5As shown, a second support spring 233 is fixedly installed at the bottom of the secondary telescopic groove 231. The other end of the second support spring 233 is fixedly installed on the lower surface of the secondary connecting shaft 232. The first support spring 223 and the second support spring 233 absorb the ejection vibration, avoid hard contact and scratch the surface of the product, prevent excessive instantaneous thrust, and can adaptively adjust according to the slight unevenness of the product surface to ensure that appropriate ejection force can be applied to each contact point and prevent the product from jamming.

[0028] like Figure 2 , Figure 4 As shown, several connecting rods 211 are fixedly installed in a ring array on the side wall of the support plate 21. A connecting ring 212 is fixedly installed at one end of the connecting rod 211 to increase the structural strength of the support plate 21.

[0029] like Figure 2 , Figure 4 As shown, the radius of the main mounting shaft 22 is larger than that of the secondary mounting shaft 23. The secondary mounting shafts 23 are fixedly installed in a ring array around the main mounting shaft 22. The main mounting shaft 22 is located in the center, and the secondary mounting shafts 23 are distributed in a ring array around it. This provides more uniform support force during the ejection process, realizes multi-point synchronous ejection, ensures that the product remains balanced during the process of leaving the mold, and reduces product warping or cracking problems caused by single-point ejection.

[0030] like Figure 5 As shown, a first sealing ring 225 is fixedly installed at the edge of the first mounting plate 224;

[0031] like Figure 5 As shown, a second sealing ring 235 is fixedly installed at the edge of the second mounting plate 234. The first sealing ring 225 and the second sealing ring 235 prevent plastic burrs or debris from entering the ejection mechanism, reduce friction and jamming, improve the sealing performance during equipment operation, reduce the possibility of external dust or other impurities entering the system, extend the service life of the equipment, and provide a better sealing effect during ejection to prevent leakage. At the same time, they prevent the edges of the first mounting plate 224 and the second mounting plate 234 from scratching the product surface.

[0032] In practical use, the cylinder 2 pushes the support plate 21 upward. Several connecting rods 211 are fixedly installed in a circular array on the side wall of the support plate 21. A connecting ring 212 is fixedly installed at one end of each connecting rod 211. A main mounting shaft 22 is fixedly installed at the center of the upper surface of the connecting rod 211. Several secondary mounting shafts 23 are fixedly installed on the upper surface of the connecting rod 211, arranged in a circular array around the main mounting shaft 22. A main telescopic groove 221 is formed on the upper surface of the main mounting shaft 221. A first support spring 223 is fixedly installed at the bottom of the main telescopic groove 221. The other end of the first support spring 223 is fixedly... A main connecting shaft 222 is fixedly installed, and a first mounting plate 224 is fixedly installed on the upper surface of the main connecting shaft 222. A first sealing ring 225 is fixedly installed at the edge of the first mounting plate 224. A secondary mounting shaft 23 has a secondary telescopic groove 231 on its upper surface. A second support spring 233 is fixedly installed at the bottom of the secondary telescopic groove 231. A secondary connecting shaft 232 is fixedly installed at the other end of the second support spring 233. A second mounting plate 234 is fixedly installed on the upper surface of the secondary connecting shaft 232. A second sealing ring 235 is fixedly installed at the edge of the second mounting plate 234. When the support plate 21 moves upward, the first mounting plate 224 and the second mounting plate 225... The ejector plate 234 passes through the main ejector groove 12 and the secondary ejector groove 121 respectively, pushing the injection-molded product upwards. The first support spring 223 and the second support spring 233 absorb the ejection vibration, preventing hard contact and scratching the product surface, and preventing excessive instantaneous thrust. At the same time, they can adaptively adjust according to the slight unevenness of the product surface, ensuring that each contact point can apply appropriate ejection force and preventing the product from jamming. The main mounting shaft 22 is located in the center, and the secondary mounting shafts 23 are distributed in a ring array around it, providing more uniform support force during ejection, realizing multi-point synchronous ejection, and ensuring that the product remains intact during the process of leaving the mold. The first mounting plate 224 and the second mounting plate 234 increase the contact area, reduce stress concentration, and prevent product damage. The first sealing ring 225 and the second sealing ring 235 prevent plastic burrs or debris from entering the ejection mechanism, reduce friction and jamming, improve the sealing performance during equipment operation, reduce the possibility of external dust or other impurities entering the system, extend the service life of the equipment, and provide a better sealing effect during ejection to prevent leakage. At the same time, they prevent the edges of the first mounting plate 224 and the second mounting plate 234 from scratching the product surface.

[0033] The above description is merely a preferred embodiment of the present utility model and is not intended to limit the present utility model in any way. Although the present utility model has been disclosed above with reference to a preferred embodiment, it is not intended to limit the present utility model. Any person skilled in the art can make some modifications or alterations to the above-disclosed technical content to create equivalent embodiments without departing from the scope of the present utility model. Any simple modifications, equivalent changes and alterations made to the above embodiments based on the technical essence of the present utility model without departing from the scope of the present utility model shall still fall within the scope of the present utility model.

Claims

1. An automatic ejection device for an injection molding machine, comprising a housing (1), characterized in that, The housing (1) has an adjustment groove (11) inside, and a cylinder mounting groove (111) is provided at the center of the bottom surface of the adjustment groove (11). A cylinder (2) is fixedly installed in the cylinder mounting groove (111), and the housing (111) also includes: A support plate (21) is fixedly installed on the upper end of the piston rod of the cylinder (2). Several connecting rods (211) are fixedly installed on the side wall of the support plate (21). A main mounting shaft (22) is fixedly installed on the upper surface of the support plate (21). A main telescopic groove (221) is opened on the upper surface of the main mounting shaft (221). A main connecting shaft (222) is slidably installed in the main telescopic groove (221). A first mounting plate (224) is fixedly installed on the upper surface of the main connecting shaft (222). Several secondary mounting shafts (23) are fixedly installed on the upper surface of the connecting rods (211). A secondary telescopic groove (231) is opened on the upper surface of the secondary mounting shafts (23). A secondary connecting shaft (232) is slidably installed in the secondary telescopic groove (231). A second mounting plate (234) is fixedly installed on the upper surface of the secondary connecting shaft (232). The injection-molded product is ejected through the first mounting plate (224) and the second mounting plate (234).

2. The automatic ejection device for an injection molding machine according to claim 1, characterized in that, The upper surface of the housing (1) is provided with a main ejector groove (12) that connects to the adjustment groove (11) at the center, and the upper surface of the housing (1) is provided with a number of secondary ejector grooves (121) in a ring array.

3. The automatic ejection device for an injection molding machine according to claim 1, characterized in that, The bottom of the main telescopic groove (221) is fixedly installed with a first support spring (223), and the other end of the first support spring (223) is fixedly installed on the lower surface of the main connecting shaft (222).

4. The automatic ejection device for an injection molding machine according to claim 1, characterized in that, The bottom of the secondary telescopic groove (231) is fixedly installed with a second support spring (233), and the other end of the second support spring (233) is fixedly installed on the lower surface of the secondary connecting shaft (232).

5. The automatic ejection device for an injection molding machine according to claim 1, characterized in that, The plurality of connecting rods (211) are fixedly installed in a ring array on the side wall of the support plate (21), and a connecting ring (212) is fixedly installed at one end of the connecting rod (211).

6. The automatic ejection device for an injection molding machine according to claim 1, characterized in that, The radius of the main mounting shaft (22) is larger than that of the secondary mounting shaft (23), and the secondary mounting shaft (23) is fixedly installed in a ring array around the main mounting shaft (22).

7. The automatic ejection device for an injection molding machine according to claim 1, characterized in that, A first sealing ring (225) is fixedly installed at the edge of the first mounting plate (224).

8. The automatic ejection device for an injection molding machine according to claim 1, characterized in that, A second sealing ring (235) is fixedly installed at the edge of the second mounting plate (234).

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