Multi-ejection injection molding rear mold
By designing a multi-ejection post-mold, the injection molded parts are ejected in stages using secondary ejector pins and primary ejector pins. Combined with the automatic control of telescopic claws and guide blocks, the problem of difficult demolding of injection molded parts is solved, and smooth demolding and structural protection of injection molded parts are achieved.
Patent Information
- Application Number
- CN202423283597.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-30
- Publication Date
- 2026-01-13
- Estimated Expiration
- 2034-12-30
AI Technical Summary
When injection molded parts have complex structures, traditional ejector pins can easily damage parts of the structure, leading to difficulties in demolding.
Design a multi-ejection injection mold that uses secondary ejector pins and primary ejector pins to eject the injection molded parts in stages, and combines telescopic claws and guide blocks to achieve automatic control, ensuring smooth demolding of the injection molded parts.
It enables smooth demolding of injection molded parts, avoids structural damage, and features a simple structure and precise control.
Smart Images
Figure CN223790938U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to injection mold, especially a kind of multiple ejection injection post mould. BACKGROUND
[0002] Injection part is widely used due to its good mechanical and chemical properties. Injection part is usually molded into the shape required by injection mold, and the injection part needs to be removed from the injection mold after injection molding. When the structure of the injection part is complex, the injection part will stick to the post mold, so a traditional injection mold will be provided with a ejector pin to eject the injection part. When the injection part is complex, the use of ejector pin will damage part of the structure. SUMMARY
[0003] In view of the deficiencies of the prior art, the utility model aims to provide a multiple ejection injection post mould.
[0004] The utility model discloses a technical scheme that solves its technical problem is: a kind of multiple ejection injection mold, including back mould base plate, be provided in the back mould base plate front side's back mould cushion block, be provided in the back mould cushion block front side's back mould connecting plate, be provided in the back mould connecting plate front side's back mould plate, be provided in the back mould plate front side's back mould kernel, be provided in the back mould connecting plate with the back mould base plate between primary ejector plate and secondary ejector plate, primary ejector plate and secondary ejector plate are arranged from back to front in order, primary ejector plate and secondary ejector plate are slidably connected front and back, one primary ejector post is equipped on primary ejector plate, one primary ejector post is sequentially penetrated secondary ejector plate, back mould connecting plate, back mould plate, back mould kernel front, the side of secondary ejector plate is fixedly connected with forward secondary ejector rod, back mould connecting plate side is equipped with guide block, guide block extends to the side of back mould plate, the side of back mould plate is equipped with guide groove to guide block, secondary ejector rod and guide groove are slidably matched, the side of back mould plate is elastically telescopic connection with telescopic claw, the telescopic direction of telescopic claw is directly to the side of guide block towards back mould plate, the telescopic direction of telescopic claw is perpendicular to secondary ejector rod sliding path and each other intersection, the one end of back mould plate that telescopic claw projects is equipped with front and rear avoiding slot, the width of avoiding slot is greater than the width of secondary ejector rod, the avoiding slot is the through groove that extends front and rear, the one end of back mould plate that telescopic claw projects is equipped with pressure surface, the both sides of guide groove are equipped with extrusion inclined surface, the pressure surface extends from the front side center of back mould plate to the back of outside of back mould plate, the extrusion inclined surface extends from the front side center of back mould plate to the back of outside of back mould plate, the extrusion inclined surface is attached to the pressure surface, when the front side of back mould connecting plate is in the state of attachment with the back side of back mould plate, telescopic claw is in the state of complete projection, the distance between the bottom of avoiding slot and the bottom of guide groove is less than the thickness of secondary ejector rod, i.e. the front end of secondary ejector rod abuts the back side of telescopic claw, when back mould plate is at the front stroke terminal point, telescopic claw is in the state of compression, secondary ejector rod penetrates avoiding slot.
[0005] As further improvement of the design, the back mould base plate is provided with a forwardly extending main guide post and a secondary guide post, the primary ejector plate and the secondary ejector plate are slidably matched with the main guide post, the primary ejector plate is slidably matched with the secondary guide post, a secondary reset spring is connected between the back mould connecting plate and the secondary ejector plate, and a primary reset spring is connected between the back mould connecting plate and the primary ejector plate.
[0006] As a further improvement of the design, the rear die pad opposite side is provided with reset step, the width between the reset step is less than the width of the secondary ejector pin plate, the secondary ejector pin plate is limited by the reset step front side when in rear limit, the main guide column is the stepped guide column with thin front end and thick rear end, the secondary ejector pin plate is in sliding fit with the small diameter end of the main guide column, the primary ejector pin plate is in sliding fit with the large diameter end of the main guide column, the secondary ejector pin plate is limited by the stepped part of the main guide column when in rear limit.
[0007] As a further improvement of the design, the rear die connecting plate is provided with rear die guide column, the rear die plate is in sliding fit with the rear die guide column.
[0008] As a further improvement of the design, the rear die bottom plate is provided with counter, the primary ejector pin plate is provided with counter paw connected through bolt, the bolt penetrates the waist round hole of the counter paw, the waist round hole extends forward and backward.
[0009] As a further improvement of the design, the front end corner of the upper and lower sides of the secondary ejector rod is provided with chamfer, the upper and lower sides of the rear end corner of the avoiding groove is provided with chamfer, the secondary ejector rod is in fit with the avoiding groove when penetrating the avoiding groove.
[0010] As a further improvement of the design, the rear die connecting plate and the rear die plate are provided with ejector pin guide insert, the primary ejector pin column is in sliding fit with the ejector pin guide insert.
[0011] As a further improvement of the design, the primary ejector pin plate is provided with reset column extending forward, the reset column extends forward to the front side of the rear die plate.
[0012] The beneficial effects of the present utility model are as follows: the secondary ejector rod is used to eject the rear die plate, and then the primary ejector pin column is used to eject the injection molded part from the rear die, so that the injection molded part is ejected step by step, and the injection molded part is smoothly demolded; the telescopic paw and the guide block are used to realize the automatic control of the stroke of the secondary ejector rod when ejecting the rear die plate, and the structure is simple. BRIEF DESCRIPTION OF DRAWINGS
[0013] The present utility model is further described below in combination with the drawings and embodiments.
[0014] Figure 1 It is the overall three-dimensional structure schematic diagram of the present utility model;
[0015] Figure 2 It is the front view schematic diagram of the present utility model.
[0016] Figure 3 It is the A-A position cross section schematic diagram of the present utility model in Figure 2 .
[0017] Figure 4 is the utility model in Figure 2 the middle B-B position section view schematic diagram.
[0018] Figure 5 is the utility model's guide block, secondary ejector pin and telescopic claw combination three-dimensional schematic diagram.
[0019] Figure 6 is the utility model's secondary ejector pin and telescopic claw combination three-dimensional schematic diagram.
[0020] In the figure 1. rear mold base plate, 2. secondary reset spring, 3. rear mold connecting plate, 4. guide block, 40. guide groove, 41. extrusion inclined surface, 5. rear mold core, 6. telescopic claw, 60. avoid slot, 61. pressure surface, 7. rear mold pad, 8. secondary ejector pin plate, 9. counter, 10. counting claw, 11. primary ejector pin plate, 12. reset step, 13. secondary ejector pin, 14. rear mold plate, 15. main guide column, 16. ejector pin guide insert, 17. primary reset spring, 18. reset column, 19. primary ejector pin column, 20. rear mold guide column, 21. secondary guide column. DETAILED DESCRIPTION
[0021] The utility model will be combined with the specific embodiment and the drawing to explain in detail, the illustrative embodiment and the explanation of the utility model are only used to explain the utility model, but do not as the limitation to the utility model.
[0022] Embodiment: please see Figure 1 、 Figure 3 And Figure 5The embodiment provides a multi-time ejection post-moulding mould, which comprises a post-moulding base plate 1, a post-moulding cushion block 7 arranged on the front side of the post-moulding base plate 1, a post-moulding connecting plate 3 arranged on the front side of the post-moulding cushion block 7, a post-moulding plate 14 arranged on the front side of the post-moulding connecting plate 3, a post-moulding core 5 arranged on the front side of the post-moulding plate 14, a primary ejection pin plate 11 and a secondary ejection pin plate 8 arranged between the post-moulding connecting plate 3 and the post-moulding base plate 1, the primary ejection pin plate 11 and the secondary ejection pin plate 8 are arranged in sequence from back to front, the primary ejection pin plate 11 and the secondary ejection pin plate 8 are slidably connected front to back, a primary ejection pin column 19 is arranged on the primary ejection pin plate 11, the primary ejection pin column 19 penetrates the secondary ejection pin plate 8, the post-moulding connecting plate 3, the post-moulding plate 14 and the post-moulding core 5 in sequence from back to front, a secondary ejection pin 13 extending forward is fixed to the side of the secondary ejection pin plate 8, a guide block 4 is arranged on the side of the post-moulding connecting plate 3, the guide block 4 extends forward to the side of the post-moulding plate 14, a guide groove 40 is arranged on the side of the post-moulding plate 14, the secondary ejection pin 13 and the guide groove 40 are slidably connected, a telescopic claw 6 is elastically connected to the side of the post-moulding plate 14, the telescopic direction of the telescopic claw 6 is opposite to the side of the post-moulding plate 14, the telescopic direction of the telescopic claw 6 is perpendicular to the sliding path of the secondary ejection pin 13 and intersects with each other, the telescopic claw 6 is provided with front and back avoiding grooves 60 at one end of the post-moulding plate 14, the width of the avoiding grooves 60 is greater than the width of the secondary ejection pin 13, the avoiding grooves 60 are through grooves extending front to back, the telescopic claw 6 is provided with a pressure surface 61 at one end of the post-moulding plate 14, the two sides of the guide groove 40 are provided with extrusion inclined surfaces 41, the pressure surface 61 extends from the front center of the post-moulding plate 14 to the back of the outer side of the post-moulding plate 14, the extrusion inclined surfaces 41 extend from the front center of the post-moulding plate 14 to the back of the outer side of the post-moulding plate 14, the extrusion inclined surfaces 41 are attached to the pressure surface 61, when the side of the post-moulding plate 14 is attached to the front side of the post-moulding connecting plate 3, the telescopic claw 6 is in a fully extended state, the distance between the bottom of the avoiding grooves 60 and the bottom of the guide groove 40 is less than the thickness of the secondary ejection pin 13, that is, the front end of the secondary ejection pin 13 abuts against the back side of the telescopic claw 6, when the post-moulding plate 14 is at the front stroke end point, the telescopic claw 6 is in a compressed state, the secondary ejection pin 13 penetrates the avoiding grooves 60.
[0023] The secondary ejection pin 13 is used to eject the post-moulding plate 14, and then the primary ejection pin column 19 is used to eject the injection-moulded part from the post-moulding core 5, so that the injection-moulded part is ejected step by step, and the smooth demoulding of the injection-moulded part is ensured.
[0024] See Figure 3, in order to improve the guide accuracy of the secondary ejector plate 8 and the primary ejector plate 11, the rear mold base plate 1 is provided with a main guide pillar 15 and a secondary guide pillar 21 extending forward, the primary ejector plate 11 and the secondary ejector plate 8 are in sliding fit with the main guide pillar 15, the primary ejector plate 11 is in sliding fit with the secondary guide pillar 21, the secondary reset spring 2 is connected between the rear mold connecting plate 3 and the secondary ejector plate 8, and the primary reset spring 17 is connected between the rear mold connecting plate 3 and the primary ejector plate 11.
[0025] Please see Figure 3 , in order to control the reset position of the secondary ejector plate 8, the rear mold cushion block 7 is provided with a reset step 12 on one side, the width between the reset steps 12 is smaller than the width of the secondary ejector plate 8, the secondary ejector plate 8 abuts against the front side of the reset step 12 when it is in the rear limit position, the main guide pillar 15 is a stepped guide pillar with a thin front end and a thick rear end, the secondary ejector plate 8 is in sliding fit with the small-diameter end of the main guide pillar 15, the primary ejector plate 11 is in sliding fit with the large-diameter end of the main guide pillar 15, and the secondary ejector plate 8 abuts against the stepped part of the main guide pillar 15 when it is in the rear limit position.
[0026] Please see Figure 4 , in order to ensure the sliding accuracy of the rear mold plate 14, the rear mold connecting plate 3 is provided with a rear mold guide pillar 20, and the rear mold plate 14 is in sliding fit with the rear mold guide pillar 20.
[0027] Please see Figure 1 , in order to facilitate the use of the mold, the rear mold base plate 1 is provided with a counter 9, and the primary ejector plate 11 is connected with a counting claw 10 abutting against the counter 9 through a bolt. In order to facilitate the adjustment of the position of the counting claw 10 and the counting of the counter 9, the bolt penetrates the waist round hole of the counting claw 10, and the waist round hole extends forward and backward.
[0028] Please see Figure 6 , in order to facilitate the retraction of the secondary ejector rod 13 into the avoidance groove 60 after the extension claw 6, the front end corners of the upper and lower sides of the secondary ejector rod 13 are provided with chamfers, the upper and lower side corners of the rear end of the avoidance groove 60 are provided with chamfers, and the secondary ejector rod 13 is in fit with the avoidance groove 60 when the secondary ejector rod 13 penetrates the avoidance groove 60.
[0029] Please see Figure 3 , in order to improve the sliding accuracy of the primary ejector rod 19, the rear mold connecting plate 3 and the rear mold plate 14 are provided with an ejector guide insert 16, and the primary ejector rod 19 is in sliding fit with the ejector guide insert 16.
[0030] Please see Figure 3In order to ensure that the primary ejector post 19 is reset in place, the primary ejector plate 11 is provided with a reset post 18 extending forward, and the reset post 18 extends forward to the front side of the rear mold plate 14.
[0031] When the ejection mold is opened, the primary ejector plate 11 and the secondary ejector plate 8 move forward, the secondary ejector rod 13 abuts against the rear side of the retractable claw 6, and then pushes the rear mold plate 14 to move forward, and then the retractable claw 6 is retracted under the extrusion of the guide block 4 until the secondary ejector rod 13 is inserted into the avoidance slot 60, the rear mold plate 14 stops moving forward, the primary ejector plate 11 and the secondary ejector plate 8 continue to move forward, and the primary ejector post 19 pushes the injection molded part on the rear mold core 5 out of the mold cavity.
[0032] The above is only an embodiment of the present application, and does not limit the patent range of the present application, and any equivalent structure or equivalent process transformation, or direct or indirect application in other related technical fields, is also included in the patent protection range of the present application.
Claims
1. A multi-shot ejection injection mold, characterized by, The back mold base plate, the back mold cushion block arranged on the front side of the back mold base plate, the back mold connecting plate arranged on the front side of the back mold cushion block, the back mold plate arranged on the front side of the back mold connecting plate, the back mold core arranged on the front side of the back mold plate, the primary ejector plate and the secondary ejector plate arranged between the back mold connecting plate and the back mold base plate, the primary ejector plate and the secondary ejector plate are arranged in sequence from back to front, the primary ejector plate and the secondary ejector plate are slidably connected front and back, the primary ejector plate is provided with a primary ejector post, the primary ejector post penetrates the secondary ejector plate, the back mold connecting plate, the back mold plate and the back mold core in sequence from front to back, the side of the secondary ejector plate is fixedly connected with a forward secondary ejector rod, the side of the back mold connecting plate is provided with a guide block, the guide block extends to the side of the back mold plate, the side of the guide block towards the back mold plate is provided with a guide groove, the secondary ejector rod and the guide groove are in sliding fit, the side of the back mold plate is elastically connected with a retractable claw, the retractable direction of the retractable claw is opposite to the side of the guide block towards the back mold plate, the retractable direction of the retractable claw is perpendicular to the sliding path of the secondary ejector rod and intersects with each other, the end of the back mold plate where the retractable claw extends out is provided with front and back avoiding grooves, the width of the avoiding grooves is greater than the width of the secondary ejector rod, the avoiding grooves are through grooves extending front and back, the end of the back mold plate where the retractable claw extends out is provided with a pressure receiving surface, the two sides of the guide groove are provided with extrusion inclined surfaces, the pressure receiving surface extends from the front center of the back mold plate to the back of the outer side of the back mold plate, the extrusion inclined surface extends from the front center of the back mold plate to the back of the outer side of the back mold plate, the extrusion inclined surface is in close contact with the pressure receiving surface, when the back side of the back mold plate and the front side of the back mold connecting plate are in close contact, the retractable claw is in a fully extended state, the distance between the bottom of the avoiding groove and the bottom of the guide groove is less than the thickness of the secondary ejector rod, that is, the front end of the secondary ejector rod abuts against the back side of the retractable claw, when the back mold plate is at the front stroke end point, the retractable claw is in a compressed state, the secondary ejector rod penetrates the avoiding groove.
2. A multi-shot ejection injection mold according to claim 1, characterized in that The back mold base plate is provided with a forward extending main guide column and a secondary guide column, the primary ejector plate and the secondary ejector plate are in sliding fit with the main guide column, the primary ejector plate is in sliding fit with the secondary guide column, the back mold connecting plate and the secondary ejector plate are connected with a secondary reset spring, the back mold connecting plate and the primary ejector plate are connected with a primary reset spring.
3. A multi-shot ejection injection mold back mold according to claim 2, characterized in that, The back mold cushion block is provided with a reset step on the opposite side, the width between the reset steps is less than the width of the secondary ejector plate, the secondary ejector plate abuts against the front side of the reset step when in back limiting, the main guide column is a stepped guide column with a thin front end and a thick rear end, the secondary ejector plate is in sliding fit with the small diameter end of the main guide column, the primary ejector plate is in sliding fit with the large diameter end of the main guide column, the secondary ejector plate abuts against the stepped part of the main guide column when in back limiting.
4. A multi-shot ejection injection mold back mold according to claim 1, wherein, The back mold connecting plate is provided with a back mold guide column, the back mold plate is in sliding fit with the back mold guide column.
5. A multi-shot ejection injection mold back mold according to claim 1, wherein, The back mold base plate is provided with a counter, the primary ejector plate is provided with a counting pawl connected with the counter through a bolt, the bolt penetrates a waist round hole on the counting pawl, and the waist round hole extends forward and backward.
6. A multi-shot ejection injection mold back mold according to claim 1, wherein, The front end corners of the upper and lower sides of the secondary ejector rod are provided with chamfers, the upper and lower side corners of the rear end of the avoiding groove are provided with chamfers, and the secondary ejector rod is in fit with the avoiding groove when the secondary ejector rod penetrates the avoiding groove.
7. A multi-shot ejection injection mold back mold according to claim 1, wherein, The back mold connecting plate and the back mold plate are provided with an ejector guide insert, and the primary ejector rod is in sliding fit with the ejector guide insert.
8. A multi-shot ejection injection mold back mold according to claim 1, wherein, The primary ejector plate is provided with a reset column extending forward, and the reset column extends forward to the front side of the back mold plate.