An injection mold with a push-type delayed ejection mechanism

Abstract

This utility model discloses an injection mold with a push-type delayed ejection mechanism. It relates to the field of injection mold technology and includes a mounting frame and an ejection assembly. The mounting frame has an extrusion device and a through slot on its top and bottom sides, respectively. Guide sleeves are provided around the mounting frame, and guide rods connected to the upper mold are inserted into the guide sleeves. A lower mold is provided on the guide sleeves, contacting the upper mold. A connecting rod connected to the upper mold is provided at the output end of the extrusion device. Depending on the thickness of the part being molded, the ejection assembly can be inserted into fixed holes of different heights. The position of the ejection assembly on the vertical rod can be adjusted, thereby adjusting the distance between the ejection rod and the movable block. This ensures that during delayed ejection of the part, the extrusion device's extension stroke is not excessive, and the distance between the upper mold and the part after demolding allows for safe material handling, thus improving the applicability of the delayed ejection mechanism.

Description

Technical Field

[0001] This utility model relates to the field of injection mold technology, specifically to an injection mold with a push-type delayed ejection mechanism. Background Technology

[0002] Injection molding, also known as injection molding, is a molding method that combines injection and molding. The advantages of injection molding are that the shapes can range from simple to complex, the sizes can range from large to small, the product dimensions are precise, the products are easy to update and replace, and it can produce complex-shaped parts. Specifically, it is a method of injecting plastic material that has been completely melted by stirring with a screw at a certain temperature into the mold cavity under high pressure, and then obtaining the molded product after cooling and solidification.

[0003] In some injection molds, the lifting of the upper mold after molding marks the start of demolding. If demolding occurs before the upper mold reaches the required demolding height, the part may be squeezed between the mold and the upper mold. Similarly, if the upper mold is raised too low, removing the internal part becomes difficult and creates a feeling of pressure, posing a potential danger. CN217968137U discloses an injection mold with a delayed ejection mechanism. After the equipment is raised, the extrusion platen moves upward. Only when the extrusion platen reaches a designated height and continues to rise does it extrude and eject the molded material from the molding channel. This ensures that a certain distance exists between the upper mold and the part when the part is removed, thus preventing squeezing between the part and the upper mold through delayed ejection. Furthermore, the close proximity between the part and the upper mold during material removal prevents obstruction or collision, making material removal safer and more reliable.

[0004] However, in the existing technology, the distance between the extrusion top block and the top connecting middle block is fixed. When the thickness of the part is too thin, the excessive delay distance will cause the extrusion equipment to have an excessively long extension stroke, resulting in high cost and low efficiency. When the thickness of the part is too thick, the excessive delay distance will cause the distance between the part and the upper die to be too close when picking up the material. Therefore, the existing technology has a limited scope of application. Moreover, when the mold is closed, there is a lack of buffer between the upper and lower dies, which can easily cause excessive mold closing force, thereby damaging the mold. Utility Model Content

[0005] To address the shortcomings of existing technologies, this utility model provides an injection mold with a push-type delayed ejection mechanism, which solves the problems existing in the prior art.

[0006] To achieve the above objectives, this utility model is implemented through the following technical solution: an injection mold with a push-type delayed ejection mechanism, including a mounting frame and an ejection assembly, wherein an extrusion device and a through groove are respectively provided on the top and bottom sides of the mounting frame, guide sleeves are provided around the mounting frame, and a guide rod connected to the upper mold is inserted into the guide sleeve, a lower mold that contacts the upper mold is provided on the guide sleeve, a connecting rod connected to the upper mold is provided at the output end of the extrusion device, a flow channel and two screw mounting sleeves are provided on the upper mold, and a cavity and a return spring are provided on the lower mold, wherein a movable block with its top extending into the cavity is provided on the return spring;

[0007] Both screw mounting sleeves are equipped with vertical rods that penetrate the upper and lower molds. Fixing holes are evenly opened on opposite sides of the two vertical rods. The two ends of the ejector assembly are respectively inserted into the fixing holes at the same height on both sides. The bottom of the vertical rod is provided with a protrusion, and the bottom sides of the mounting bracket are provided with buffer components that contact the protrusion.

[0008] Preferably, the mounting bracket is vertically provided with a scale plate.

[0009] Preferably, the ejector assembly includes an ejector rod located below the movable block, and both the ejector rod and the movable block are opposite to the scale plate. Fixed rods that slide out from both sides of the ejector rod and are inserted into the fixed holes are provided. A support spring is provided between the fixed rod and the ejector rod. An anti-slip sleeve is provided at the front end of the fixed rod. Both the vertical rod and the ejector rod are opposite to the through groove.

[0010] Preferably, the two rear ends of the ejector rod are provided with sliding plates, and the opposite sides of the two vertical rods are provided with sliding grooves with open bottoms, and the sliding grooves are slidably connected to the sliding plates.

[0011] Preferably, the buffer assembly includes a slide rod vertically slidably connected to the bottom of the mounting bracket, a slide rail is provided at the top of the slide rod, and a buffer spring connected to the mounting bracket is provided on the slide rail. A slider that contacts the bottom of the protrusion is slidably connected to the slide rail laterally, and a screw is connected between the slider and the slide rail.

[0012] Preferably, T-shaped positioning rods are attached to the ends of the two slide rails that are far apart from each other, and the two positioning rods are respectively connected to the two sliders.

[0013] This invention provides an injection mold with a push-type delayed ejection mechanism. Compared with the prior art, it has the following advantages:

[0014] 1. This injection mold with a push-type delayed ejection mechanism allows the ejection assembly to be inserted into fixed holes of different heights according to the thickness of the molded parts. The position of the ejection assembly on the vertical rod can be adjusted, thereby adjusting the distance between the ejection rod and the movable block. This ensures that when the parts are ejected with a delay, the problem of excessive extension and retraction of the extrusion equipment is not caused, and the distance between the upper mold and the part after demolding can be safely used for material handling. This improves the applicability of the delayed ejection mechanism.

[0015] 2. This injection mold with a push-type delayed ejection mechanism uses a buffer component to buffer the mold just before it closes. It is highly practical. During buffering, the protrusion on the vertical rod can compress the slider, which in turn compresses the buffer spring on the slide rail. This slows down the mold closing speed and prevents the mold from being damaged due to excessive force during the mold closing. In addition, the slider can move away from the protrusion on the slide rail without affecting the disassembly and assembly of the vertical rod. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0017] Figure 2 This is a cross-sectional view of the overall structure of this utility model;

[0018] Figure 3 This is a schematic diagram of the ejection assembly of this utility model;

[0019] Figure 4 This is a schematic diagram of the buffer component of this utility model.

[0020] In the diagram: 1. Mounting bracket; 2. Extrusion equipment; 3. Guide sleeve; 4. Lower die; 5. Connecting rod; 6. Upper die; 7. Runner; 8. Screw mounting sleeve; 9. Cavity; 10. Movable block; 11. Return spring; 12. Vertical rod; 13. Fixing hole; 14. Protrusion; 15. Scale plate; 16. Ejector rod; 17. Fixing rod; 18. Support spring; 19. Anti-slip sleeve; 20. Slide plate; 21. Slide rod; 22. Slide rail; 23. Buffer spring; 24. Slider; 25. Screw; 26. Positioning rod. Detailed Implementation

[0021] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0022] See Figures 1-4 This utility model provides the following two technical solutions:

[0023] First embodiment: An injection mold with a push-type delayed ejection mechanism includes a mounting frame 1 and an ejection assembly. The top and bottom sides of the mounting frame 1 are respectively provided with an extrusion device 2 and a through groove. The extrusion device 2 is used to drive the upper mold 6 to rise and fall, which is equivalent to a hydraulic telescopic rod or other telescopic structure. Guide sleeves 3 are provided around the mounting frame 1, and guide rods connected to the upper mold 6 are inserted into the guide sleeves 3. A lower mold 4 that contacts the upper mold 6 is provided on the guide sleeves 3. A connecting rod 5 connected to the upper mold 6 is provided at the output end of the extrusion device 2. The upper mold 6 is provided with a flow channel 7 and two screw mounting sleeves 8. The flow channel 7 is used to inject molten plastic. The lower mold 4 is provided with a cavity 9 and a return spring 11. The return spring 11 is provided with a movable block 10 that extends into the cavity 9. The movable block 10 is equivalent to the bottom of the cavity 9. When demolding, the movable block 10 is squeezed, which compresses the return spring 11, and the part in the cavity 9 can be pushed out through the movable block 10.

[0024] Both screw mounting sleeves 8 are equipped with vertical rods 12 that penetrate the upper mold 6 and the lower mold 4, facilitating the installation and removal of the vertical rods 12. The vertical rods 12 can penetrate the lower mold 4 when the mold is closed. The two vertical rods 12 are evenly vertically provided with fixing holes 13 on opposite sides. The two ends of the ejector assembly are respectively inserted into the fixing holes 13 at the same height on both sides, so that the height of the ejector assembly can be adjusted. The bottom of the vertical rods 12 is provided with protrusions 14, and the bottom sides of the mounting bracket 1 are provided with buffer components that contact the protrusions 14, so that buffering is provided when the mold is about to be closed, which is highly practical.

[0025] A scale plate 15 is vertically installed on the mounting bracket 1.

[0026] The ejector assembly includes an ejector rod 16, which is located below the movable block 10. Both the ejector rod 16 and the movable block 10 are opposite to the scale plate 15, which facilitates the measurement of the distance between the ejector rod 16 and the movable block 10, so as to adjust the height of the ejector rod 16 laterally. Both sides of the ejector rod 16 have a fixed rod 17 that slides out and is inserted into the fixed hole 13. A support spring 18 is provided between the fixed rod 17 and the ejector rod 16, so that the fixed rod 17 can be stably inserted into the fixed hole 13. In order to facilitate pulling the fixed rods 17 on both sides, an anti-slip sleeve 19 is provided at the front end of the fixed rod 17. In order to allow vertical disassembly and assembly of the vertical rod 12 and the ejector rod 16, both the vertical rod 12 and the ejector rod 16 are opposite to the through groove.

[0027] When adjusting the height of the ejector rod 16 between the two vertical rods 12, it is more convenient to adjust if the ejector rod 16 can be guided. Therefore, a sliding plate 20 is provided at the rear end of both sides of the ejector rod 16. A sliding groove with an open bottom is opened on the opposite side of the two vertical rods 12, and the sliding groove is slidably connected to the sliding plate 20. The open bottom of the sliding groove allows the ejector rod 16 to be moved out.

[0028] The buffer assembly includes a slide rod 21 vertically slidably connected to the bottom of the mounting bracket 1. A slide rail 22 is provided at the top of the slide rod 21, and a buffer spring 23 connected to the mounting bracket 1 is provided on the slide rail 22. A slider 24 that contacts the bottom of the protrusion 14 is slidably connected to the slide rail 22. A screw 25 connects the slider 24 and the slide rail 22. During buffering, the protrusion 14 on the vertical rod 12 can compress the slider 24, so that the slide rail 22 compresses the buffer spring 23, which can slow down the mold closing speed and avoid excessive force during mold closing, which could damage the mold. The slider 24 can be moved away from the protrusion 14 on the slide rail 22 by removing the screw 25, so as not to affect the disassembly and assembly of the vertical rod 12.

[0029] The second implementation differs from the first implementation in that: T-shaped positioning rods 26 are attached to the ends of the two slide rails 22 that are far apart from each other, and the two positioning rods 26 are respectively connected to the two sliders 24. When the sliders 24 are pulled until the positioning rods 26 are limited by the slide rails 22, the screws 25 are inserted to fix the sliders 24, which improves the convenience of installation.

[0030] Furthermore, all content not described in detail in this specification is existing technology known to those skilled in the art, and the model parameters of each electrical appliance are not specifically limited; conventional equipment can be used.

[0031] In use, insert the vertical rod 12 into the bottom through slot. Then, according to the thickness of the part being molded and the scale on the scale plate 15, fix the fixing rod 17 on the ejector rod 16 into the required fixing hole 13. Then extend the slider 24 to contact the bottom of the protrusion 14. Next, move the upper mold 6 of the extrusion device 2 upward, so that the ejector rod 16 moves upward as well. Only when it contacts the movable block 10 will the part be extruded for demolding. After demolding, stop moving upward. This will not cause the extrusion device 2 to have an excessively long extension stroke, and will ensure that the distance between the upper mold 6 and the part after demolding is safe enough for material handling. After material handling is completed, the mold is closed. When the mold is about to be closed, the protrusion 14 on the vertical rod 12 will squeeze the slider 24, so that the slide rail 22 squeezes the buffer spring 23. This can prevent the mold closing speed from being too fast and the force from being too great, and better protect the upper mold 6 and the lower mold 4.

[0032] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0033] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. An injection mold with a push-type delayed ejection mechanism, characterized in that: The assembly includes a mounting frame (1) and an ejector assembly. The mounting frame (1) is provided with an extrusion device (2) and a through slot on its top and bottom sides, respectively. The mounting frame (1) is provided with guide sleeves (3) around its perimeter, and a guide rod connected to the upper mold (6) is inserted into the guide sleeve (3). The guide sleeve (3) is provided with a lower mold (4) that contacts the upper mold (6). The output end of the extrusion device (2) is provided with a connecting rod (5) connected to the upper mold (6). The upper mold (6) is provided with a flow channel (7) and two screw mounting sleeves (8). The lower mold (4) is provided with a cavity (9) and a return spring (11), and the return spring (11) is provided with a movable block (10) that extends into the cavity (9) at its top. Both screw mounting sleeves (8) are provided with vertical rods (12) that penetrate the upper mold (6) and the lower mold (4). The two vertical rods (12) are provided with fixing holes (13) evenly and vertically on opposite sides. The two ends of the ejection assembly are respectively inserted into the fixing holes (13) at the same height on both sides. The bottom of the vertical rod (12) is provided with a protrusion (14), and the bottom sides of the mounting bracket (1) are provided with buffer components that contact the protrusion (14).

2. The injection mold with a push-type delayed ejection mechanism according to claim 1, characterized in that: A scale plate (15) is vertically arranged on the mounting bracket (1).

3. The injection mold with a push-type delayed ejection mechanism according to claim 2, characterized in that: The ejection assembly includes an ejection rod (16), which is located below the movable block (10). Both the ejection rod (16) and the movable block (10) are opposite to the scale plate (15). Both sides of the ejection rod (16) have a fixed rod (17) that slides out into the fixed hole (13). A support spring (18) is provided between the fixed rod (17) and the ejection rod (16). An anti-slip sleeve (19) is provided at the front end of the fixed rod (17). Both the vertical rod (12) and the ejection rod (16) are opposite to the through groove.

4. The injection mold with a push-type delayed ejection mechanism according to claim 3, characterized in that: The ejector rod (16) has a sliding plate (20) at both rear ends. The opposite sides of the vertical rods (12) are provided with a sliding groove with an open bottom, and the sliding groove is slidably connected to the sliding plate (20).

5. An injection mold with a push-type delayed ejection mechanism according to claim 1, characterized in that: The buffer assembly includes a slide rod (21) that is vertically slidably connected to the bottom of the mounting bracket (1). A slide rail (22) is provided on the top of the slide rod (21), and a buffer spring (23) connected to the mounting bracket (1) is provided on the slide rail (22). A slider (24) that contacts the bottom of the protrusion (14) is slidably connected to the slide rail (22), and a screw (25) is connected between the slider (24) and the slide rail (22).

6. An injection mold with a push-type delayed ejection mechanism according to claim 5, characterized in that: T-shaped positioning rods (26) are attached to the ends of the two slide rails (22) that are far apart from each other, and the two positioning rods (26) are respectively connected to the two sliders (24).

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