Injection molding part ejection mechanism and method and injection molding device

Abstract

The invention relates to an injection molding part ejection mechanism and method and an injection molding device, and belongs to the field of injection molding machines. The injection molding part ejection mechanism comprises a support assembly and a sliding plate slidably connected with the support assembly, a plurality of lead screws extending in the sliding direction of the sliding plate are arranged on the support assembly, and the sliding plate is rotationally connected with the lead screws; the sliding plate is connected with an ejector pin, and the lead screw is in transmission connection with a motor. According to the ejection mechanism, the multiple lead screws are symmetrically arranged, the multiple lead screws are driven by the motor to synchronously rotate to push the ejector plate to achieve the ejection action, the unbalance loading torque is eliminated through the symmetrical arrangement of the multiple lead screws, the movement stability is good, the response speed is high, the precision in the aspects of positioning and synchronization is high in the mode that the lead screws are driven by the motor, the structure is simple, stability is good, and energy consumption is low; and the risk of oil leakage is avoided.

Description

Technical Field

[0001] This application relates to the field of injection molding machines, and in particular to an ejection mechanism, method and injection device for injection molded parts. Background Technology

[0002] Injection molding is an important method of plastic processing. As a key component of injection molding machines, the ejection mechanism is used to eject and demold the workpiece after injection molding. Its performance directly affects the demolding efficiency and molding quality of the workpiece.

[0003] Currently, mainstream ejection mechanisms are divided into two categories: hydraulic and mechanical. Hydraulic ejection uses a hydraulic cylinder to push the ejector plate to achieve the ejection action, and the ejection force is controlled by adjusting the hydraulic pressure. The advantages of this structure are large thrust and easy control, but the disadvantages are the risk of oil leakage and slow response speed. Mechanical ejection uses a crank-connecting rod or cam mechanism to drive the ejector plate to achieve the ejection action. The problem with mechanical ejection is that the positioning accuracy is poor due to transmission backlash.

[0004] With the increasing demand for high-precision injection molding, the limitations of traditional ejection mechanisms in terms of stability, synchronization, and energy consumption are becoming increasingly apparent. Summary of the Invention

[0005] In order to solve the problems of traditional ejection mechanisms mentioned in the background art, this application provides an ejection mechanism, method and injection device for injection molded parts.

[0006] The technical solution provided in this application for an ejection mechanism, method, and injection molding device for injection molded parts is as follows: An ejection mechanism for injection molded parts includes a support assembly and a slide plate slidably connected to the support assembly. The support assembly is provided with a plurality of lead screws extending along the sliding direction of the slide plate. The slide plate is screwed to the lead screws. The slide plate is connected to an ejector pin. The lead screws are driven by a motor.

[0007] By adopting the above technical solution, the ejector plate is pushed by the synchronous rotation of multiple lead screws driven by the motor to achieve the ejection action. The symmetrical layout of the multiple lead screws eliminates the off-center load torque, resulting in good motion stability and fast response speed. The motor-driven lead screw method has high accuracy in positioning and synchronization, and has a simple structure, good stability, low energy consumption, and no risk of oil leakage.

[0008] Preferably, the bracket assembly includes a pair of spaced-apart mounting plates and guide posts fixedly connected to the pair of mounting plates. The guide posts are parallel to the lead screw, and the slide plate is slidably connected to the guide posts.

[0009] By adopting the above technical solution, smooth gliding of the skateboard can be achieved.

[0010] Preferably, the slide plate is provided with a guide sleeve and a linear bearing, the guide sleeve is slidably connected to the guide post, and the linear bearing is screwed to the lead screw.

[0011] By adopting the above technical solution, smooth gliding of the skateboard can be achieved.

[0012] Preferably, the ejector pin is parallel to the lead screw, and the ejector pin is slidably connected to one of the mounting plates.

[0013] By adopting the above technical solution, it is easy to design the ejector pin to slide through one of the mounting plates, thereby improving its sliding stability.

[0014] Preferably, the ejector pin slides through one of the mounting plates, and there are multiple ejector pins.

[0015] By adopting the above technical solution, the ejector pin is designed to slide through one of the mounting plates to improve its sliding stability.

[0016] Preferably, the motor is fixedly connected to another mounting plate.

[0017] By adopting the above technical solution, the motor can be easily installed and fixed.

[0018] Preferably, there are multiple guide posts, and the multiple guide posts and lead screws are distributed in a centrally symmetrical manner around the same center.

[0019] By adopting the above technical solution, the eccentric load moment is eliminated, resulting in good motion stability.

[0020] Preferably, both the lead screw and the output shaft of the motor are equipped with pulleys, and multiple pulleys are connected by a synchronous belt drive.

[0021] By adopting the above technical solution, the synchronous rotation of multiple lead screws driven by the motor can be achieved.

[0022] In another aspect of this disclosure, an injection molding part ejection method is provided, applied to the aforementioned injection molding part ejection mechanism, comprising: This causes the motor to drive multiple lead screws to rotate synchronously. Multiple lead screws rotate, causing the slide to move along the lead screw axis; The movement of the slide plate causes the ejector pin to move, ejecting the injection molded part.

[0023] By adopting the above technical solution, the ejection action is achieved by relying on the synchronous rotation of multiple lead screws driven by the motor to push the ejector plate. The symmetrical layout of the multiple lead screws eliminates the off-center load torque, resulting in good motion stability and fast response speed. The motor-driven lead screw method has high accuracy in positioning and synchronization, and is simple in structure, has good stability, low energy consumption, and no risk of oil leakage.

[0024] In another aspect of this disclosure, an injection molding apparatus is provided, including the aforementioned injection molding part ejection mechanism.

[0025] By adopting the above technical solution, the injection molding device can achieve the ejection action by driving multiple lead screws to rotate synchronously with a motor to push the ejector plate. The symmetrical layout of the multiple lead screws eliminates the off-center load torque, resulting in good motion stability and fast response speed. The motor-driven lead screw method has high precision in positioning and synchronization, and is simple in structure, has good stability, low energy consumption, and no risk of oil leakage.

[0026] In summary, this application includes at least one of the following beneficial technical effects: The ejection mechanism of this application adopts a multi-screw symmetrical layout. It relies on the motor to drive the multi-screw to rotate synchronously and push the ejector plate to achieve the ejection action. The multi-screw symmetrical layout eliminates the off-center load torque, has good motion stability and fast response speed. The motor-driven screw method has high accuracy in positioning and synchronization, and has a simple structure, good stability, low energy consumption and no risk of oil leakage. Attached Figure Description

[0027] Figure 1 This is a schematic diagram of the ejection mechanism of the injection molded part in the embodiments of this application. Figure 1 .

[0028] Figure 2 This is a schematic diagram of the ejection mechanism of the injection molded part in the embodiments of this application. Figure 2 .

[0029] Figure 3 This is a schematic diagram of the ejection mechanism of the injection molded part in the embodiments of this application. Figure 3 .

[0030] Explanation of reference numerals in the attached drawings: 1. Bracket assembly; 11. Mounting plate; 12. Guide post; 2. Slide plate; 21. Guide sleeve; 22. Linear bearing; 3. Lead screw; 4. Threshold pin; 5. Electric motor; 6. Pulley; 7. Limit switches. Detailed Implementation

[0031] Exemplary embodiments will now be described more fully with reference to the accompanying drawings. However, these exemplary embodiments can be implemented in many forms and should not be construed as limited to the embodiments set forth herein; rather, they are provided so that this disclosure will be thorough and complete, and will fully convey the concept of the exemplary embodiments to those skilled in the art. The same reference numerals in the drawings denote the same or similar structures, and therefore detailed descriptions of them will be omitted. Furthermore, the drawings are merely illustrative of this disclosure and are not necessarily drawn to scale.

[0032] The following is in conjunction with the appendix Figures 1-2 This application will be described in further detail.

[0033] In one aspect of this disclosure, an ejection mechanism for injection molded parts is provided, such as... Figure 1 and Figure 2 As shown, it includes a support assembly 1 and a slide plate 2 slidably connected to the support assembly 1, the slide plate 2 sliding on the support assembly 1.

[0034] Specifically, such as Figure 1 and Figure 2 As shown, the bracket assembly 1 includes a pair of spaced-apart mounting plates 11 and guide posts 12 that are fixedly connected to the pair of mounting plates 11. Preferably, there are multiple guide posts 12, thereby enhancing the connection strength of the pair of spaced-apart mounting plates 11.

[0035] Preferably, a pair of spaced-apart mounting plates 11 are parallel to each other to facilitate the assembly and disassembly of the bracket assembly 1.

[0036] like Figure 1 and Figure 2 As shown, in some embodiments, the slide plate 2 is slidably connected to the guide post 12; furthermore, as... Figure 2 As shown, the slide plate 2 is provided with a guide sleeve 21, which is slidably connected to the guide post 12. The guide sleeve 21 facilitates the smooth sliding of the slide plate 2 along the guide post 12.

[0037] In practice, the guide sleeve 21 can be fixedly connected to the slide plate 2 and cannot be disassembled, or it can be designed to be disassembled so that the guide sleeve 21 can be replaced.

[0038] like Figure 1 and Figure 2 As shown, in some embodiments, the support assembly 1 is provided with multiple lead screws 3 extending along the sliding direction of the slide plate 2. The guide post 12 is parallel to the lead screws 3, the slide plate 2 is screwed to the lead screws 3, the slide plate 2 is connected to a ejector pin 4, and the lead screws 3 are driven by a motor 5. With this design, after the motor 5 starts, it drives the lead screws 3 to rotate, which in turn drives the slide plate 2 to slide along the guide post 12, pushing the ejector pin 4 to achieve the ejection action.

[0039] Preferably, the multiple guide posts 12 and lead screws 3 are centrally symmetrically distributed around the same center. This design eliminates the off-center load moment and makes the sliding plate 2 move smoothly.

[0040] like Figure 1 and Figure 2 As shown, in some embodiments, the slide plate 2 is provided with a linear bearing 22, which is screwed to the lead screw 3. This design facilitates the smooth sliding of the slide plate 2.

[0041] In practice, the linear bearing 22 can be either fixedly connected to the slide plate 2 and cannot be disassembled, or it can be designed to be disassembled for easy replacement.

[0042] In this embodiment, by adopting the above technical solution, the multi-screw 3 is driven by the motor 5 to rotate synchronously and push the ejector plate 4 to achieve the ejection action. The symmetrical layout of the multi-screw 3 eliminates the off-center load torque, resulting in good motion stability and fast response speed. The method of the motor 5 driving the screw 3 has high accuracy in positioning and synchronization, and has a simple structure, good stability, low energy consumption, and no risk of oil leakage.

[0043] Furthermore, such as Figure 1 and Figure 2 As shown, in some embodiments, the ejector pin 4 is parallel to the lead screw 3, and the ejector pin 4 is slidably connected to the upper mounting plate 11. This design facilitates the ejector pin 4 to slide through the upper mounting plate 11, thereby improving its sliding stability.

[0044] Preferably, the ejector pin 4 slides through the upper mounting plate 11. There are multiple ejector pins 4. This design makes it easier to design the ejector pin 4 to slide through the upper mounting plate 11, thereby improving its sliding stability.

[0045] like Figure 1 and Figure 2 As shown, in some embodiments, the motor 5 is fixedly connected to the lower mounting plate 11. This design facilitates the transmission connection between the motor 5 and the pulley 6 at the lower end of the lead screw 3. Figure 1 and Figure 2 As shown, both the lead screw 3 and the output shaft of the motor 5 are equipped with pulleys 6, and multiple pulleys 6 are connected by a synchronous belt (not shown in the figure).

[0046] The use of a synchronous belt enables the motor 5 to drive the multi-screw 3 to rotate synchronously, achieving high positioning and synchronization accuracy. This avoids the problem of insufficient synchronization accuracy causing the ejector pin 4 to push the injection molded part sequentially, resulting in deformation of the injection molded part.

[0047] Of course, in other embodiments, a transmission method in which the motor 5 is directly connected to the lead screw 3 can also be used. In this case, the motor 5 is preferably a geared motor 5.

[0048] In practice, the number of lead screw 3, guide post 12, and ejector pin 4 can be set according to actual needs. There is no specific limit to the number, as long as it is greater than one. For example, in this embodiment... Figure 1 and Figure 2 The diagram shows 2 lead screws 3, 2 guide posts 12, and 5 ejector pins 4.

[0049] The ejection mechanism of the injection molded part in this embodiment adopts a structure design in which the motor 5 drives the multi-screw 3 to rotate and drive the ejector pin 4 plate to realize the ejection action. Compared with the traditional hydraulic ejection mechanism, there is no risk of oil leakage, avoiding the problem of oil pollution in the environment. The motor 5 has a fast response speed, precise and efficient adjustment, and high accuracy. Moreover, the energy consumption of the motor 5 drive is lower, saving at least 40% more energy than the hydraulic system.

[0050] The ejection mechanism of injection molded parts will be described in detail below through a specific embodiment.

[0051] like Figure 1 and Figure 2 As shown, the injection molding ejection mechanism includes a support assembly 1 and a slide plate 2 slidably connected to the support assembly 1. The slide plate 2 slides on the support assembly 1. The support assembly 1 is provided with multiple lead screws 3 extending along the sliding direction of the slide plate 2. The guide post 12 is parallel to the lead screw 3. The slide plate 2 is screwed to the lead screw 3. The slide plate 2 is connected to an ejector pin 4. The lead screw 3 is driven by a motor 5.

[0052] The bracket assembly 1 includes a pair of spaced-apart mounting plates 11 and guide posts 12 fixedly connected to the pair of mounting plates 11. A lead screw 3 is rotatably connected to the mounting plates 11 via an angular contact bearing. The lead screw 3 is a ball screw pair conforming to GB / T17587.3 standard, with a diameter of 32mm, a lead of 10mm, and a long service life. Furthermore, the ball screw is a planetary roller screw, which, compared to a conventional ball screw 3, increases the load-bearing capacity by 300%, making it suitable for heavy-duty injection molding applications.

[0053] When the bracket assembly 1 of this embodiment is fixedly installed on the injection molding device, it is necessary to ensure that the verticality of the guide post 12 is ≤0.02mm / m.

[0054] In some embodiments, the slide plate 2 is provided with a linear bearing 22, which is screwed to the lead screw 3, and the linear guide rail adopts the HIWIN brand HG series with specification SR35.

[0055] The motor 5 is a servo motor 5, which is selected from the Yaskawa Σ-7 series with a rated power of 1.5kW.

[0056] Motor 5 and pulley 6 are connected by a coupling.

[0057] The slide plate 2 is provided with a guide sleeve 21, which is slidably connected to the guide post 12. When assembling the guide sleeve 21 and the guide post 12, the gap between the guide sleeve 21 and the guide post 12 needs to be adjusted to 0.05-0.08mm.

[0058] In some embodiments, such as Figure 3 As shown, each of the pair of spaced mounting plates 11 is equipped with a limit switch 7. The limit switch 7 is used to control the motor 5 to stop working after the slide plate 2 contacts it.

[0059] In another aspect of the embodiments of this disclosure, an injection molding part ejection method is provided, applied to the aforementioned injection molding part ejection mechanism, comprising: S1. Make the motor 5 drive multiple lead screws 3 to rotate synchronously; S2. Multiple lead screws 3 rotate synchronously, causing the slide plate 2 to move along the axis of the lead screws 3; S3, the movement of the slide plate 2 drives the movement of the ejector pin 4 to eject the injection molded part.

[0060] By adopting the above technical solution, the ejection action is achieved by relying on the motor 5 to drive the multi-screw 3 to rotate synchronously and push the ejector plate 4. The symmetrical layout of the multi-screw 3 eliminates the off-center load torque, resulting in good motion stability and fast response speed. The method of the motor 5 driving the screw 3 has high accuracy in positioning and synchronization, and the structure is simple, stable, energy-efficient, and has no risk of oil leakage.

[0061] In S1, after installing the timing belt, it is necessary to check that the axial movement of the two lead screws 3 is ≤0.01mm. Additionally, before starting the motor 5, the motor parameters need to be set, and parameters such as synchronization accuracy need to be tested under no-load conditions.

[0062] In another aspect of the present disclosure, an injection molding apparatus is provided, including the aforementioned injection molding part ejection mechanism.

[0063] By adopting the above technical solution, the injection molding device can achieve the ejection action by driving the multi-screw 3 synchronously to push the ejector plate 4 through the motor 5. The symmetrical layout of the multi-screw 3 eliminates the off-center load torque, resulting in good motion stability and fast response speed. The method of driving the screw 3 by the motor 5 has high precision in positioning and synchronization, and has a simple structure, good stability, low energy consumption, and no risk of oil leakage.

[0064] Unless otherwise defined, the technical or scientific terms used in this application shall have the ordinary meaning understood by one of ordinary skill in the art to which this application pertains. The terms "first," "second," "third," and similar terms used in this application specification and claims do not indicate any order, quantity, or importance, but are merely used to distinguish different components. The terms "an" or "a" and similar terms do not indicate a quantity limitation, but rather indicate the presence of at least one. The terms "comprising" or "including" and similar terms mean that the elements or objects preceding "comprising" or "including" encompass the elements or objects listed following "comprising" or "including" and their equivalents, and do not exclude other elements or objects. "Above," "below," "left," "right," etc., are used only to indicate relative positional relationships; when the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0065] The above are all preferred embodiments of this application and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. An ejection mechanism for injection molded parts, characterized in that: The device includes a support assembly and a slide plate slidably connected to the support assembly. The support assembly is provided with multiple lead screws extending along the sliding direction of the slide plate. The slide plate is screwed to the lead screws. The slide plate is connected to a pin. The lead screws are driven by a motor.

2. The injection molding ejection mechanism according to claim 1, characterized in that: The bracket assembly includes a pair of spaced-apart mounting plates and guide posts fixedly connected to the pair of mounting plates. The guide posts are parallel to the lead screw, and the sliding plate is slidably connected to the guide posts.

3. The injection molding ejection mechanism according to claim 2, characterized in that: The slide plate is equipped with a guide sleeve and a linear bearing. The guide sleeve is slidably connected to the guide post, and the linear bearing is screwed to the lead screw.

4. The injection molding ejection mechanism according to claim 2, characterized in that: The ejector pin is parallel to the lead screw, and the ejector pin is slidably connected to one of the mounting plates.

5. The injection molding ejection mechanism according to claim 4, characterized in that: The ejector pin slides through one of the mounting plates, and there are multiple ejector pins.

6. The injection molding ejection mechanism according to claim 5, characterized in that: The motor is fixedly connected to another mounting plate.

7. The injection molding ejection mechanism according to claim 2, characterized in that: There are multiple guide posts, and the multiple guide posts and lead screws are distributed in a centrally symmetrical manner around the same center.

8. The injection molding ejection mechanism according to claim 1, characterized in that: Both the lead screw and the output shaft of the motor are equipped with pulleys, and multiple pulleys are connected by a synchronous belt drive.

9. A method for ejecting an injection molded part, applied to the injection molded part ejection mechanism of any one of claims 1-8, characterized in that, include: This causes the motor to drive multiple lead screws to rotate synchronously. Multiple lead screws rotate, causing the slide to move along the lead screw axis; The movement of the slide plate causes the ejector pin to move, ejecting the injection molded part.

10. An injection molding device, characterized in that: The injection molding ejection mechanism includes any one of claims 1-8.

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