An injection mold ejector pin device with adjustable ejection distance

Abstract

This utility model relates to the technical field of ejector pin devices, and discloses an adjustable ejection distance ejector pin device for injection molds. It includes a base, a fixed mold fixedly mounted on the upper end of the base, and sliding grooves on both sides of the lower end of the fixed mold. Screws are rotatably mounted inside the two sliding grooves, and driven gears are fixedly connected to the lower ends of the two screws. Synchronous motors are fixedly mounted on both sides inside the fixed mold, and driving gears are fixedly connected to the output ends of the two synchronous motors. Movable sleeves are threaded onto the outer walls of the two screws, and a support plate is fixedly connected between the two movable sleeves. In this utility model, the ejection distance of the ejector pins can be adjusted. By adjusting the ejector pins, it can adapt to the production of plastic parts of different specifications within the same series, avoiding mold jamming or damage to plastic parts due to insufficient distance. It can also accelerate the cooling speed of the mold, shorten the cooling time, and ensure that the ejector pins do not damage the plastic products during the ejection process.

Description

Technical Field

[0001] This utility model relates to the field of ejector device technology, and in particular to an ejector device for injection molds with adjustable ejection distance. Background Technology

[0002] In the injection molding process, mold ejector pins are used to eject the molded product from the mold. Traditional mold ejector pins are cylindrical ejector rods with equal outer diameters and cylindrical ejector pin countersunk heads. This type of mold ejector pin is installed in the mounting hole in the mold. When it is necessary to eject the molded product, the ejector pin rod of the mold ejector pin extends out of the mounting hole and ejects the product. In order to adapt to the ejection requirements of plastic parts with different wall thicknesses and different structures (such as deep cavities, protrusions, and undercuts), it is necessary to use an injection mold ejector pin device with adjustable ejection distance.

[0003] Most existing injection mold ejector devices have a fixed ejection distance for the ejector pins, which cannot be adjusted. When producing plastic parts of different specifications in the same series, insufficient distance can easily lead to mold jamming or damage to the plastic parts. Furthermore, after injection molding, natural cooling is usually required, which increases the cooling time. Insufficient cooling time can cause the ejector pins to damage the plastic products during the ejection process, thereby increasing production costs.

[0004] Therefore, those skilled in the art have provided an injection mold ejector pin device with adjustable ejection distance to solve the problems mentioned in the background art. Utility Model Content

[0005] The purpose of this utility model is to overcome the shortcomings of the existing technology and provide an injection mold ejector pin device with adjustable ejection distance. This device can adjust the ejection distance of the ejector pin, and can adapt to the production of plastic parts of different specifications in the same series by adjusting the ejector pin, avoiding mold jamming or damage to plastic parts due to insufficient distance, and can accelerate the cooling speed of the mold, shorten the cooling time, and ensure that the ejector pin will not damage the plastic product during the ejection process.

[0006] To achieve the above objectives, this utility model provides the following technical solution:

[0007] An adjustable ejection distance injection mold ejector pin device includes a base, a fixed mold fixedly mounted on the upper end of the base, and sliding grooves on both sides of the lower end of the fixed mold. Screws are rotatably mounted inside the two sliding grooves, and driven gears are fixedly connected to the lower ends of the two screws. Synchronous motors are fixedly mounted on both sides inside the fixed mold, and driving gears are fixedly connected to the output ends of the two synchronous motors. Movable sleeves are threaded onto the outer walls of the two screws, and a support plate is fixedly connected between the two movable sleeves.

[0008] Furthermore, the two driving gears are respectively meshed with their corresponding driven gears;

[0009] The above technical solution uses a synchronous motor to drive the drive gear to rotate, which in turn drives the driven gear to rotate, causing the lead screws on both sides of the fixed mold to rotate, which in turn drives the movable sleeve to move. This allows the position of the support plate to be adjusted, thereby adjusting the ejection distance of the ejector pin.

[0010] Furthermore, the two movable sleeves are limited to slide within the groove;

[0011] Through the above technical solution, the movable sleeve slides inside the groove, thereby achieving the limiting position.

[0012] Furthermore, hydraulic push rods are fixedly provided on both sides of the upper end of the support plate, and an ejector plate is fixedly connected between the two hydraulic push rods and located at its upper end. Three sleeves are fixedly provided in the middle of the upper end of the fixed mold, and an ejector pin is fixedly provided in the middle of the upper end of the ejector plate and its upper end is slidably provided inside the sleeve.

[0013] The above technical solution uses a hydraulic push rod to move the ejector plate, which in turn moves the ejector pin, allowing the cooled plastic part to be ejected. With the cooperation of the sleeve, the ejector plate moves in a straight line, preventing the ejector pin from tilting.

[0014] Furthermore, springs are fitted on the outer walls of the three ejector pins and are located between the ejector plate and the fixed mold, and a moving mold is placed on the upper end of the fixed mold;

[0015] The above technical solution allows the use of springs to absorb the impact force during mold opening and closing, reducing wear and deformation of mold components and extending their service life.

[0016] Furthermore, a U-shaped cooling channel is provided inside the moving mold, an input pipe is fixedly connected to one side of the U-shaped cooling channel, and an output pipe is fixedly connected to the side of the U-shaped cooling channel away from the input pipe;

[0017] The above technical solution injects coolant into the U-shaped cooling channel through the input pipe and discharges it through the output pipe, thereby achieving circulation and accelerating the cooling speed of the plastic part, shortening the cooling time, and ensuring that the ejector pin will not damage the plastic product during the ejection process.

[0018] Furthermore, the moving mold has an injection hole in the middle of its upper end, the fixed mold has positioning pins fixedly installed on both sides of its upper end, the moving mold has positioning holes on both sides of its upper end that correspond to the positioning pins, and the base has through holes at the four corners of its lower end.

[0019] The above technical solution allows for the injection of hot melt raw materials by opening injection holes, prevents displacement of the fixed mold and moving mold during use by using positioning pins and positioning holes, and facilitates the fixing of the fixed mold by opening through holes.

[0020] This utility model has the following beneficial effects:

[0021] 1. This utility model proposes an adjustable ejector pin device for injection molds. By setting up a synchronous motor, driven gear, driving gear, lead screw, and movable sleeve, the position of the support plate can be adjusted, thereby adjusting the ejection distance of the ejector pin. By adjusting the ejector pin, it can be adapted to the production of plastic parts of different specifications in the same series, avoiding mold jamming or damage to plastic parts due to insufficient distance. By setting up a U-shaped cooling channel, input pipe, and output pipe, the cooling speed of the mold can be accelerated, the cooling time can be shortened, and it can be ensured that the ejector pin will not damage the plastic product during the ejection process, thus improving its convenience and practicality. Attached Figure Description

[0022] Figure 1 This is a perspective view of an adjustable ejection distance ejector pin device for an injection mold proposed in this utility model.

[0023] Figure 2 This is a front sectional view of an adjustable ejection distance injection mold ejector pin device proposed in this utility model;

[0024] Figure 3 for Figure 2 Enlarged view of point A in the middle;

[0025] Figure 4 This is a schematic diagram of another perspective of the adjustable ejection distance injection mold ejector pin device proposed in this utility model;

[0026] Figure 5 This is a top sectional view of the moving mold of an injection mold ejector pin device with adjustable ejection distance proposed in this utility model.

[0027] Explanation of reference numerals in the attached figures:

[0028] 1. Base; 2. Fixed mold; 3. Slide groove; 4. Lead screw; 5. Movable sleeve; 6. Driven gear; 7. Synchronous motor; 8. Drive gear; 9. Support plate; 10. Hydraulic push rod; 11. Ejector plate; 12. Sleeve; 13. Ejector pin; 14. Spring; 15. Moving mold; 16. U-shaped cooling channel; 17. Input pipe; 18. Output pipe; 19. Injection hole; 20. Through hole; 21. Locating pin; 22. Locating hole. Detailed Implementation

[0029] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of specific embodiments. Obviously, the described specific embodiments are only a part of the specific embodiments of the present invention, and not all of them. Based on the specific embodiments of the present invention, all other specific embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0030] Reference Figure 1-3 This utility model provides a specific embodiment: an adjustable ejection distance injection mold ejector device, including a base 1, a fixed mold 2 fixedly mounted on the upper end of the base 1, and sliding grooves 3 on both sides of the lower end of the fixed mold 2. Screws 4 are rotatably mounted inside the two sliding grooves 3, and driven gears 6 are fixedly connected to the lower ends of the two screws 4. Synchronous motors 7 are fixedly mounted on both sides inside the fixed mold 2, and driving gears 8 are fixedly connected to the output ends of the two synchronous motors 7. Movable sleeves 5 are threaded onto the outer walls of the two screws 4, and a support plate 9 is fixedly connected between the two movable sleeves 5. The two driving gears 8 are meshed with the corresponding driven gears 6. The synchronous motors 7 drive the driving gears 8 to rotate, thereby driving the driven gears 6 to rotate, causing the screws 4 on both sides of the fixed mold 2 to rotate, and thus moving the movable sleeves 5. This allows adjustment of the position of the support plate 9, thereby adjusting the ejection distance of the ejector pin 13. The two movable sleeves 5 slide within the sliding grooves 3, thus achieving limiting.

[0031] Reference Figure 2 , 4Hydraulic push rods 10 are fixedly installed on both sides of the upper end of the support plate 9. An ejector plate 11 is fixedly connected between the two hydraulic push rods 10 and located at its upper end. Three sleeves 12 are fixedly installed in the upper middle part of the fixed mold 2. Ejector pins 13 are fixedly installed in the upper middle part of the ejector plate 11, with their upper ends sliding inside the sleeves 12. The hydraulic push rods 10 push the ejector plate 11 to move, thereby driving the ejector pins 13 to move, allowing the cooled plastic part to be ejected. With the cooperation of the sleeves 12, it is ensured that the ejector plate 11 moves in a straight line, preventing the ejector pins 13 from tilting. Springs 14 are sleeved on the outer walls of the three ejector pins 13 and located between the ejector plate 11 and the fixed mold 2. A moving mold 15 is placed on the upper end of the fixed mold 2. The springs 14 absorb the impact force during mold opening and closing, reducing wear and deformation of mold components and extending service life. A U-shaped cooling channel 16 is opened inside the moving mold 15. An input pipe 17 is fixedly connected to one side of the U-shaped cooling channel 16, and an output pipe 18 is fixedly connected to the side of the U-shaped cooling channel 16 away from the input pipe 17. Coolant is injected into the U-shaped cooling channel 16 through the input pipe 17 and discharged through the output pipe 18, thereby achieving circulation and accelerating the cooling speed of the plastic part, shortening the cooling time, and ensuring that the ejector pin 13 will not damage the plastic product during the ejection process. An injection hole 19 is opened in the middle of the upper end of the moving mold 15. Positioning pins 21 are fixedly installed on both sides of the upper end of the fixed mold 2. Positioning holes 22 are opened on both sides of the upper end of the moving mold 15 and correspond to the positioning pins 21. Through holes 20 are opened at the four corners of the lower end of the base 1. The injection hole 19 is opened to facilitate the injection of hot melt material. The positioning pins 21 and positioning holes 22 are used to prevent displacement of the fixed mold 2 and the moving mold 15 during use. The through holes 20 are opened to facilitate the fixation of the fixed mold 2.

[0032] Working principle: When using this adjustable ejection distance injection mold ejector device, the synchronous motor 7 drives the drive gear 8 to rotate, which in turn drives the driven gear 6 to rotate, causing the lead screws 4 on both sides of the fixed mold 2 to rotate, which in turn drives the movable sleeve 5 to move. This allows for adjustment of the position of the support plate 9, thereby adjusting the ejection distance of the ejector pin 13. By adjusting the ejector pin 13, it can be adapted to the production of plastic parts of different specifications in the same series, avoiding mold jamming or damage to plastic parts due to insufficient distance. Coolant is injected into the U-shaped cooling channel 16 through the input pipe 17 and discharged through the output pipe 18, thereby achieving circulation and accelerating the cooling speed of the plastic parts, shortening the cooling time, and ensuring that the ejector pin 13 will not damage the plastic products during the ejection process. The hydraulic push rod 10 pushes the ejector plate 11 to move, thereby driving the ejector pin 13 to move, so that the cooled plastic parts can be ejected.

[0033] The following points should be noted in this article:

[0034] 1. The accompanying drawings of the embodiments disclosed herein only relate to the structures involved in the embodiments disclosed herein; other structures can be referred to in general design.

[0035] 2. Where there is no conflict, the embodiments of this disclosure and the features in the embodiments can be combined with each other to obtain new embodiments.

[0036] Finally, it should be noted that the above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Although the present utility model has been described in detail with reference to the foregoing specific embodiments, those skilled in the art can still modify the technical solutions described in the foregoing specific embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. An adjustable ejection distance ejector pin device for injection molds, comprising a base (1), characterized in that: The base (1) is fixedly provided with a fixed mold (2) at the upper end. The fixed mold (2) has sliding grooves (3) on both sides at the lower end. The two sliding grooves (3) are rotatably provided with lead screws (4). The lower ends of the two lead screws (4) are fixedly connected with driven gears (6). The fixed mold (2) is fixedly provided with synchronous motors (7) on both sides inside. The output ends of the two synchronous motors (7) are fixedly connected with driving gears (8). The outer walls of the two lead screws (4) are threaded with movable sleeves (5). The two movable sleeves (5) are fixedly connected with a support plate (9).

2. The adjustable ejection distance ejector pin device for injection molds according to claim 1, characterized in that: The two driving gears (8) are respectively meshed with the corresponding driven gears (6).

3. The injection mold ejector pin device with adjustable ejection distance according to claim 1, characterized in that: The two movable sleeves (5) are limited to slide inside the groove (3).

4. The injection mold ejector pin device with adjustable ejection distance according to claim 1, characterized in that: Hydraulic push rods (10) are fixedly installed on both sides of the upper end of the support plate (9). An ejector plate (11) is fixedly connected between the two hydraulic push rods (10) and located at its upper end. Three sleeves (12) are fixedly installed in the middle of the upper end of the fixed mold (2). An ejector pin (13) is fixedly installed in the middle of the upper end of the ejector plate (11) and its upper end is slidably installed inside the sleeve (12).

5. The injection mold ejector pin device with adjustable ejection distance according to claim 4, characterized in that: Springs (14) are fitted on the outer walls of the three ejector pins (13) and are located between the ejector plate (11) and the fixed mold (2). A moving mold (15) is placed on the upper end of the fixed mold (2).

6. The injection mold ejector pin device with adjustable ejection distance according to claim 5, characterized in that: The moving mold (15) has a U-shaped cooling channel (16) inside. An input pipe (17) is fixedly connected to one side of the U-shaped cooling channel (16), and an output pipe (18) is fixedly connected to the side of the U-shaped cooling channel (16) away from the input pipe (17).

7. The injection mold ejector pin device with adjustable ejection distance according to claim 6, characterized in that: The moving mold (15) has an injection hole (19) in the middle of its upper end. The fixed mold (2) has a positioning pin (21) fixed on both sides of its upper end. The moving mold (15) has a positioning hole (22) on both sides of its upper end, which corresponds to the positioning pin (21). The base (1) has through holes (20) at its four corners at its lower end.

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