Fractional ejection mechanism of injection mold

Abstract

The utility model relates to a multi-time ejection mechanism of an injection mold, which comprises a rear mold bottom plate, a rear mold cushion block, a rear mold plate and an ejector plate assembly, the ejector plate assembly comprises a first ejector plate, a second ejector plate and a secondary release mechanism, the secondary release mechanism comprises a traction hook, a telescopic claw and a release seat, and a guide strip is arranged on one side, facing the telescopic claw, of the release seat. The guide strip comprises a first guide part, a second guide part and a third guide part from front to back, the first guide part and the third guide part are both planes parallel to the moving direction of the first ejector plate, and the second guide part is an inclined plane. According to the utility model, through the matching of the towing hook and the telescopic claw, the first ejector plate is towed by the second ejector plate to jointly eject forwards in an initial ejection stage, then the telescopic claw is separated from the towing hook under the guidance of the release seat, the first ejector plate stops ejecting forwards, and the second ejector plate continues to eject forwards; only one ejection driving device is needed, the structure is simple, and the stroke of the first ejector plate is convenient to control.

Description

Technical Field

[0001] The utility model relates to an injection mold, in particular to a stepwise ejection mechanism of the injection mold. Background Art

[0002] Due to mold release requirements, some injection molds are often equipped with a staged ejection mechanism to achieve the stepwise ejection of the ejector pins. Existing staged ejection mechanisms typically use multiple ejector drivers to independently control the ejector pin strokes. This approach results in a complex ejector structure, high costs, and difficulty controlling the stability of the ejection stroke. Utility Model Content

[0003] In view of the deficiencies in the prior art, the present invention aims to provide a stepwise ejection mechanism for an injection mold.

[0004] The technical solution adopted by the utility model to solve its technical problems is: an injection mold step-by-step ejection mechanism, comprising a rear mold base plate, a rear mold pad arranged on the front side of the rear mold base plate, a rear mold plate arranged on the front side of the rear mold pad, and an ejector plate assembly arranged between the rear mold base plate and the rear mold plate, the ejector plate assembly comprising a first ejector plate, a second ejector plate located in front of the first ejector plate, a secondary release mechanism connecting the first ejector plate and the second ejector plate, the secondary release mechanism comprising a traction hook fixedly connected to the side surface of the second ejector plate, a telescopic claw elastically connected to the side surface of the first ejector plate, a release seat fixedly connected to the rear mold base plate or the rear mold pad, the release seat is provided with a guide bar on one side of the telescopic claw, the guide bar comprising a first guide portion, a second guide portion, and a third guide portion from front to back, the first guide portion and the third guide portion are both parallel to the The first guide portion is provided with a first end for sliding the guide portion into the first chute, and the second guide portion is provided with a second end for sliding the guide portion into the first chute.

[0005] As a further improvement of the present design, two guide bars are provided on each of the release seats, and a guide groove is formed between the two guide bars to facilitate the passage of the traction hook.

[0006] As a further improvement of the present design, the rear mold bottom plate is provided with an installation pit for the release seat to extend into, and the four sides of the installation pit are in contact with the bottom of the release seat.

[0007] As a further improvement of this design, the second ejector plate includes a front plate and a rear plate affixed to the rear side of the front plate. The front plate and the rear plate are detachably mechanically connected. A positioning notch is provided on the rear side of the edge of the front plate. A positioning block is provided on the side where the traction hook affixes to the second ejector plate. The positioning block affixes to the positioning notch. The front plate and the rear plate are respectively connected to the traction hook by bolts.

[0008] As a further improvement of this design, a sliding hole is provided on the side of the first ejector plate, and the telescopic claw slides in cooperation with the sliding hole. A spring is provided between the tail end of the telescopic claw and the first ejector plate, and the spring applies an elastic force to the telescopic claw toward the release seat.

[0009] As a further improvement of this design, each telescopic claw is provided with two springs, each spring is opposite to a guide bar, steps are provided on both sides of the telescopic claw, and stop blocks are connected on both sides of the sliding hole opening by bolts, and the gap between the stop blocks is smaller than the outer width of the two steps of the telescopic claw.

[0010] As a further improvement of the present design, a hollow observation hole is provided on the side of the rear mold pad, the observation hole is opposite to the release seat, and the orthographic projection of the release seat on the cross section of the observation hole is smaller than the cross section of the observation hole.

[0011] The beneficial effects of the utility model are as follows: the utility model utilizes the cooperation of the traction hook and the telescopic claw so that in the initial ejection stage, the second ejector plate is used to pull the first ejector plate to eject forward together; then, under the guidance of the release seat, the telescopic claw disengages from the traction hook, the first ejector plate stops ejecting forward, and the second ejector plate continues to eject forward; only one ejection drive device is required, the structure is simple, and the stroke of the first ejector plate is easily controlled. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0013] Figure 1 It is a schematic diagram of the overall three-dimensional structure of the utility model.

[0014] Figure 2 It is a three-dimensional schematic diagram of the utility model without the rear template and the rear mold pad.

[0015] Figure 3 It is a cross-sectional schematic diagram of the utility model without the rear template and the rear template pad.

[0016] Figure 4 It is a cross-sectional schematic diagram of the cooperation between the ejector plate assembly and the secondary release mechanism of the utility model.

[0017] Figure 5 It is a three-dimensional schematic diagram of the cooperation between the release seat and the towing hook of the utility model.

[0018] In the figure, 1. rear mold bottom plate, 2. rear mold pad, 3. observation hole, 4. second ejector plate, 40. front plate, 41. rear plate, 5. first ejector plate, 6. secondary release mechanism, 60. telescopic claw, 61. release seat, 62. traction hook, 620. groove, 621. guide surface, 622. positioning block, 623. positioning notch, 624. traction surface, 63. sliding hole, 64. spring, 65. guide bar, 650. first guide part, 651. second guide part, 652. third guide part, 66. guide groove, 7. first ejector body, 8. second ejector body, 9. mounting pit, 10. rear template. DETAILED DESCRIPTION

[0019] The present invention will be described in detail below with reference to the accompanying drawings and specific embodiments. The exemplary embodiments and descriptions are only used to explain the present invention but are not intended to limit the present invention. Example

[0020] See Figure 1 、 Figure 2 and Figure 3The present embodiment provides a stepwise ejection mechanism for an injection mold, comprising a rear mold base plate 1, a rear mold cushion block 2 arranged on the front side of the rear mold base plate 1, a rear mold plate 10 arranged on the front side of the rear mold cushion block 2, and an ejector plate assembly arranged between the rear mold base plate 1 and the rear mold plate 10, wherein the ejector plate assembly comprises a first ejector plate 5, a second ejector plate 4 located in front of the first ejector plate 5, and a secondary release mechanism 6 connecting the first ejector plate 5 and the second ejector plate 4, wherein the secondary release mechanism 6 comprises a first ejector plate 5 fixedly connected to the second ejector plate 4. The traction hook 62 on the side of the secondary ejector plate 4, the telescopic claw 60 elastically connected to the side of the primary ejector plate, and the release seat 61 fixed to the rear mold bottom plate 1 or the rear mold pad 2, the release seat 61 is provided with a guide bar 65 on the side facing the telescopic claw 60, and the guide bar 65 includes a first guide portion 650, a second guide portion 651, and a third guide portion 652 from front to back. The first guide portion 650 and the third guide portion 652 are both planes parallel to the moving direction of the first ejector plate 5. The third guide portion The vertical distance between the first guide portion 652 and the first ejector plate 5 is greater than the vertical distance between the first guide portion 650 and the first ejector plate 5. The second guide portion 651 is an inclined surface connecting the first guide portion 650 and the third guide portion 652. The head of the telescopic claw 60 is provided with a guide surface 621 that fits in with the inclined surface of the second guide portion 651. The guide surface 621 extends from the rear side of the head of the telescopic claw 60 to the front side of the tail of the telescopic claw 60. The first guide portion 650 and the second guide portion 651 are perpendicular to each other. The distance difference is greater than the depth of the telescopic claw 60 extending into the traction hook 62. The traction hook 62 is provided with a groove 620 for facilitating the extension of the telescopic claw 60. The rear side of the groove 620 is provided with a traction surface 624. The rear side of the part of the telescopic claw 60 extending into the groove 620 is provided with a pulled surface that fits with the traction surface 624. The traction surface 624 and the pulled surface are both perpendicular to the moving direction of the first ejector plate 5. The second ejector plate 4 is provided with a second ejector body 8, and the first ejector plate 5 is provided with a first ejector body 7.

[0021] The cooperation between the traction hook 62 and the telescopic claw allows the second ejector plate 4 to pull the first ejector plate 5 to be ejected forward together in the initial ejection stage. Subsequently, under the guidance of the release seat 61, the telescopic claw 60 disengages from the traction hook 62, the first ejector plate 5 stops being ejected forward, and the second ejector plate 4 continues to be ejected forward. Only one ejection drive device is required, the structure is simple, and it is easy to control the stroke of the first ejector plate 5.

[0022] See Figure 5 Two guide bars 65 are provided on each release seat 61, and a guide groove 66 is formed between the two guide bars 65 for the traction hook 62 to pass through, so as to apply a balanced retraction force to the telescopic claw 60, facilitate the smooth retraction of the telescopic claw 60, and make the traction hook 62 and the telescopic claw 60 disengage more smoothly.

[0023] See Figure 2 The rear mold bottom plate 1 is provided with a mounting pit 9 for the release seat 61 to extend into. The four sides of the mounting pit 9 fit with the bottom of the release seat 61 to offset the lateral force and torque applied to the release seat 61 and improve the stability of the release seat 61.

[0024] See Figure 1 and 4 The second ejector plate 4 includes a front plate 40 and a rear plate 41 that abuts the rear side of the front plate 40. The front plate 40 and the rear plate 41 are detachably mechanically connected. A positioning notch 623 is provided on the rear edge of the front plate 40. A positioning block 622 is provided on the side of the traction hook 62 that abuts the second ejector plate 4. The positioning block 622 abuts the positioning notch 623. The front plate 40 and the rear plate 41 are respectively connected to the traction hook 62 via bolts. The second ejector plate 4 is formed by combining the front plate 40 and the rear plate 41, which facilitates the installation and stability of the ejector pins and can accommodate thinner ejector pins.

[0025] See Figure 4 The first ejector plate 5 has a sliding hole 3 formed on its side, with the telescopic claw 60 slidingly engaged with the sliding hole 3. A spring 64 is provided between the rear end of the telescopic claw 60 and the first ejector plate 5. The spring 64 applies an elastic force to the telescopic claw 60 toward the release seat 61. The sliding hole 3 provides guidance and lateral support for the telescopic claw 60, thereby offsetting any lateral forces acting on the telescopic claw 60.

[0026] See Figure 4 Each telescopic claw 60 is equipped with two springs 64 to balance the elastic force acting on the claw 60, facilitating smooth sliding of the claw 60. Each spring 64 opposes a guide bar 65. Steps are provided on either side of the telescopic claw 60. Stoppers (not shown) are bolted to either side of the opening of the slide hole 63. The gap between the stoppers is smaller than the outer width of the two steps of the telescopic claw, facilitating positioning and replacement of the telescopic claw 60.

[0027] See Figure 1 The side of the rear mold spacer 2 is provided with a hollow observation hole 3, which is opposite to the release seat 61. The orthographic projection of the release seat 61 on the cross section of the observation hole 3 is smaller than the cross section of the observation hole 3. This facilitates rapid identification of which secondary release mechanism 6 is faulty when a malfunction occurs and facilitates maintenance of the secondary release mechanism 6.

[0028] The above description is merely an embodiment of the present invention and does not limit the patent scope of the present invention. Any equivalent structure or equivalent process transformation made by using the contents of the description and drawings of the present invention, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. A stepwise ejection mechanism for an injection mold, comprising a rear mold base plate, a rear mold pad disposed in front of the rear mold base plate, a rear mold plate disposed in front of the rear mold pad, and an ejector plate assembly disposed between the rear mold base plate and the rear mold plate, characterized in that: The ejector plate assembly includes a first ejector plate, a second ejector plate located in front of the first ejector plate, and a secondary release mechanism connecting the first ejector plate and the second ejector plate, the secondary release mechanism including a traction hook fixedly connected to the side surface of the second ejector plate, a telescopic claw elastically connected to the side surface of the first ejector plate, and a release seat fixedly connected to the rear mold bottom plate or the rear mold pad, the release seat is provided with a guide bar facing the telescopic claw, the guide bar includes a first guide portion, a second guide portion, and a third guide portion from front to back, the first guide portion and the third guide portion are both planes parallel to the moving direction of the first ejector plate, and the vertical distance between the third guide portion and the first ejector plate is greater than the vertical distance between the first guide portion and the first ejector plate The vertical distance of the needle plate, the second guide part is an inclined surface connecting the first guide part and the third guide part, the telescopic claw head is provided with a guide surface that fits with the inclined surface of the second guide part, and the guide surface extends from the rear side of the telescopic claw head to the front side of the telescopic claw tail, and the vertical distance difference between the first guide part and the second guide part is greater than the depth of the telescopic claw extending into the traction hook, and the traction hook is provided with a groove for facilitating the extension of the telescopic claw, and the rear side of the groove is provided with a traction surface, and the rear side of the part of the telescopic claw extending into the groove is provided with a pulled surface that fits with the traction surface, and the traction surface and the pulled surface are both perpendicular to the moving direction of the first thimble plate, a second thimble body is provided on the second thimble plate, and a first thimble body is provided on the first thimble plate.

2. The injection mold stepwise ejection mechanism according to claim 1, characterized in that: Two guide bars are provided on each of the release seats, and a guide groove is formed between the two guide bars for the traction hook to pass through.

3. The injection mold stepwise ejection mechanism according to claim 2, characterized in that: The rear mold bottom plate is provided with a mounting pit for the release seat to extend into, and the periphery of the mounting pit is in contact with the bottom periphery of the release seat.

4. The injection mold stepwise ejection mechanism according to claim 1, characterized in that: The second ejector plate includes a front plate and a rear plate affixed to the rear side of the front plate. The front plate and the rear plate are detachably mechanically connected. A positioning notch is provided on the rear side of the edge of the front plate. A positioning block is provided on the side where the traction hook affixes to the second ejector plate. The positioning block affixes to the positioning notch. The front plate and the rear plate are respectively connected to the traction hook by bolts.

5. The injection mold stepwise ejection mechanism according to claim 1, characterized in that: A sliding hole is provided on the side of the first ejector plate, and the telescopic claw is slidably matched with the sliding hole. A spring is provided between the tail end of the telescopic claw and the first ejector plate, and the spring applies an elastic force to the telescopic claw toward the release seat.

6. The injection mold stepwise ejection mechanism according to claim 5, characterized in that: Each telescopic claw is provided with two springs, each spring is opposite to a guide bar, steps are provided on both sides of the telescopic claw, and stop blocks are connected on both sides of the sliding hole opening by bolts, and the gap between the stop blocks is smaller than the outer width of the two steps of the telescopic claw.

7. The injection mold stepwise ejection mechanism according to any one of claims 1 to 6, characterized in that: A hollow observation hole is provided on the side of the rear mold pad, and the observation hole is opposite to the release seat. The orthographic projection of the release seat on the cross section of the observation hole is smaller than the cross section of the observation hole.

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