Novel magnetic attraction installation type mold ejector pin

Abstract

The utility model relates to a novel magnetic attraction installation type mould ejector pin which comprises a positioning base plate and an ejector pin body, the ejector pin body is matched with a guide sleeve of the positioning base plate in an up-down sliding mode, the lower end of the ejector pin body is detachably connected with a limiting base body, and the ejector pin body is provided with a gradually-shrunk inclined face which is arranged from top to bottom in a gradually-shrunk mode at the position on the lower side of the positioning base plate. A positioning sleeve is arranged on the lower side of the positioning base plate, a gradually-shrunk open hole is formed in the positioning sleeve and used for abutting against the gradually-shrunk inclined face, and a plurality of first magnetic attraction plates are arranged at the positions, close to the gradually-shrunk inclined face, in the ejector pin; a second magnetic suction plate used for being sucked with the first magnetic suction plate is arranged at the position, close to the gradually-shrunk open hole, in the positioning sleeve, and a reset spring is arranged between the limiting seat body and the positioning sleeve. The positioning precision of the ejector pin in the resetting process is enhanced, it is guaranteed that the ejector pin can accurately return to the initial position, stability is kept in the working process, and the service life of the ejector pin is prolonged. And external interference is avoided.

Description

Technical Field

[0001] This utility model relates to the field of mold ejector technology, and in particular to a novel magnetically mounted mold ejector. Background Technology

[0002] In the mold manufacturing and injection molding industry, mold ejector pins are an indispensable key component. Their main function is to separate the product from the mold through an ejection action after the product is formed, ensuring smooth demolding. Traditional mold ejector pins are usually fixedly installed, and their extension length is not adjustable. This means that when dealing with products of different sizes and shapes, it is necessary to replace them with multiple ejector pins of different specifications, increasing production costs and operational complexity.

[0003] Therefore, to improve the flexibility and applicability of mold ejector pins, a magnetically mounted mold ejector pin (application number CN202221554047.9) has been developed. Its structure includes a mounting base, a limiting roller, a central ejector pin, a first magnet, a magnetic sleeve, and a second magnet. This design achieves stable mounting and position adjustment of the central ejector pin through magnetic force, allowing for convenient adjustment of the ejector pin's extension length according to different mold requirements, thus improving the ejector pin's versatility and adaptability. However, although the above design solves some of the problems of traditional ejector pins, it still has some shortcomings in practical applications. Specifically, when the central ejector pin completes its ejection action and resets, it mainly relies on gravity to return the central ejector pin to its initial position, and the magnetic force between the first and second magnets is used for horizontal limiting and vertical height fixation. While this mechanism ensures the stability of the ejector pin in most cases, inaccurate positioning may occur under the following circumstances: 1. Increased friction: During long-term use, the friction between the ejector pin and the mold may increase due to wear or contamination, preventing the ejector pin from fully returning to its original position under gravity. 2. Magnetic attenuation: Over time, the magnetism between the first and second magnets may gradually weaken, affecting their positioning accuracy of the ejector pin. 3. External interference: Other external factors such as vibration and temperature changes may also adversely affect the reset accuracy of the ejector pin.

[0004] These problems not only lead to inaccurate center pin reset, affecting the precision and efficiency of subsequent production, but also increase the workload of equipment maintenance and debugging, reducing overall production efficiency. Therefore, developing a novel magnetically mounted mold ejector pin to overcome the shortcomings of existing technologies and improve the reset accuracy and stability of the center pin is of significant practical and technical value. This application proposes an improvement solution based on this need. Utility Model Content

[0005] This invention proposes a novel magnetically mounted mold ejector pin, which solves the aforementioned problems existing in the use of existing technologies.

[0006] The technical solution of this utility model is implemented as follows: A novel magnetically mounted mold ejector pin includes a positioning base plate and an ejector pin. A guide sleeve is fixedly connected to the middle of the positioning base plate. The ejector pin slides up and down and is engaged with the guide sleeve. A limiting seat is detachably connected to the lower end of the ejector pin. The ejector pin has a tapered inclined surface that gradually narrows from top to bottom on the lower side of the positioning base plate. A positioning sleeve is provided on the lower side of the positioning base plate. A tapered opening that gradually narrows from top to bottom is opened in the positioning sleeve. The tapered opening is used to abut against the tapered inclined surface. A plurality of first magnetic plates are provided inside the ejector pin near the tapered inclined surface. A second magnetic plate is correspondingly provided inside the positioning sleeve near the tapered opening for attracting the first magnetic plates. A return spring is provided between the limiting seat and the positioning sleeve.

[0007] Preferably, a connecting circular plate is integrally formed on the outer wall of the positioning sleeve, and at least four adjusting threaded rods are fixedly connected to the lower end of the positioning base plate. The connecting circular plate has a through-hole for the adjusting threaded rods to pass through. The adjusting threaded rods are evenly distributed in a circle on the connecting circular plate, and each adjusting threaded rod is threaded with an upper nut and a lower nut. The upper nut and the lower nut are located on the upper and lower sides of the connecting circular plate, respectively, and are used to fix and clamp the connecting circular plate.

[0008] Preferably, the limiting seat includes a main seat and a cover seat. The main seat has a convex groove extending through one side. A retaining seat is integrally formed on the lower side of the ejector pin. The retaining seat can be detachably inserted into the convex groove. The cover seat is detachably fixed on the main seat and is used to cover the opening of the convex groove.

[0009] Preferably, the width of the card holder is smaller than the inner diameter of the return spring.

[0010] Preferably, the cover seat is provided with a screw for fixing with the main seat, and the cover seat is integrally formed with a pressing protrusion for inserting into the convex groove, the pressing protrusion pressing against the card seat and the lower end of the ejector pin.

[0011] Preferably, the upper side of both the main seat and the pressing protrusion is provided with a spring positioning arc segment. There are three spring positioning arc segments on the main seat and one on the pressing protrusion. The four spring positioning arc segments are arranged equidistantly in a circle, and the spring positioning arc segments are located on the lower end of the inner diameter of the return spring.

[0012] Preferably, an upper positioning ring is fixedly connected to the lower side of the positioning sleeve, and the upper positioning ring is located at the upper end of the inner diameter of the reset spring.

[0013] In summary, the beneficial effects of this utility model are as follows:

[0014] 1. The guide sleeve design ensures stable linear movement of the ejector pin during its upward and downward sliding. The structure of the tapered opening and tapered inclined surface abutting each other enhances the positioning accuracy of the ejector pin during reset. The attraction between the first and second magnetic plates, along with the action of the reset spring, ensures that the ejector pin can accurately return to its initial position and remain stable during operation, unaffected by external interference.

[0015] 2. The design of the adjusting threaded rod and connecting circular plate allows for flexible adjustment of the positioning sleeve's position, thereby changing the extension length of the ejector pin. The clamping and fixing of the upper and lower nuts ensures the positioning sleeve remains stable after adjustment, preventing positional shifts due to vibration or other factors.

[0016] 3. The limiting seat body consists of a main seat body and a cover seat body. The retaining seat can be detachably inserted into the raised groove, facilitating the installation and removal of the limiting seat body from the ejector pin. The design of the cover seat body further enhances the stability of the structure, preventing the retaining seat from loosening or falling off. In addition, the width of the retaining seat is smaller than the inner diameter of the return spring, ensuring that the return spring can be removed downwards to remove the ejector pin, thus facilitating replacement.

[0017] 4. The setting of the spring positioning arc segment and the upper positioning ring further enhances the positioning effect of the reset spring and avoids the reset spring from shifting during compression and reset. The spring positioning arc segment is divided into four parts, which will not interfere with the disassembly between the cover seat and the main seat. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0019] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0020] Figure 2 for Figure 1 A schematic diagram of the structure when observed from another angle;

[0021] Figure 3 This is a cross-sectional structural diagram of the present invention;

[0022] Figure 4 This is an exploded view of the structure of this utility model.

[0023] In the diagram: 1. Positioning base plate; 2. Ejector pin; 21. Gradient inclined surface; 22. First magnetic suction plate; 23. Card holder; 3. Guide sleeve; 4. Limiting seat; 41. Main seat; 411. T-shaped groove; 42. Cover seat; 421. Pressing protrusion; 43. Screw; 44. Spring positioning arc segment; 5. Positioning sleeve; 51. Gradient opening; 52. Second magnetic suction plate; 53. Upper positioning ring; 6. Connecting round plate; 61. Through hole; 7. Return spring; 8. Adjusting threaded rod; 81. Upper nut; 82. Lower nut. Detailed Implementation

[0024] The following will refer to the appendix in the embodiments of this utility model. Figure 1-4 The technical solutions in the embodiments of this utility model are clearly and completely described herein. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0025] Example:

[0026] like Figures 1 to 4 As shown, this utility model discloses a novel magnetically mounted mold ejector pin, including a positioning base plate 1 and an ejector pin 2. The positioning base plate 1 has several fixing screws 9 for fixing to the bottom of the mold. A guide sleeve 3 is fixedly connected to the middle of the positioning base plate 1, and the ejector pin 2 slides up and down to engage with the guide sleeve 3. A limiting seat 4 is detachably connected to the lower end of the ejector pin 2. Furthermore, the ejector pin 2 has a tapered inclined surface 21 on the lower side of the positioning base plate 1, which tapers downwards. A positioning sleeve 5 is provided on the lower side. The positioning sleeve 5 has a tapered opening 51 that is gradually narrowed from top to bottom. The tapered opening 51 is used to abut against the tapered inclined surface 21. In addition, a number of first magnetic plates 22 are provided inside the ejector pin 2 near the tapered inclined surface 21. The positioning sleeve 5 is provided inside the positioning sleeve near the tapered opening 51 for attracting the first magnetic plates 22. In this utility model, a return spring 7 is also provided between the limiting seat 4 and the positioning sleeve 5.

[0027] Furthermore, a connecting circular plate 6 is integrally formed on the outer wall of the positioning sleeve 5, and at least four adjusting threaded rods 8 are fixedly connected to the lower end of the positioning base plate 1. A through-hole 61 for the adjusting threaded rods 8 to pass through is provided on the connecting circular plate 6. The through-hole 61 is larger than the diameter of the adjusting threaded rod 8. The adjusting threaded rods 8 are evenly distributed in a circle on the connecting circular plate 6. Each adjusting threaded rod 8 is threaded with an upper nut 81 and a lower nut 82. The upper nut 81 and the lower nut 82 are located on the upper and lower sides of the connecting circular plate 6 respectively and are used to fix and clamp the connecting circular plate 6.

[0028] The working principle of this utility model is as follows:

[0029] 1. Ejection Operation: When ejection is required, the ejection drive structure on the mold presses against the bottom end of the limiting seat 4, compressing the return spring 7, causing the ejector pin 2 to move upward and eject. During this process, the first magnetic suction plate 22 on the ejector pin 2 disengages from the second magnetic suction plate 52 inside the positioning sleeve 5, and under the action of the guide sleeve 3, the ejector pin 2 maintains stable vertical movement.

[0030] 2. Product Ejection: Ejector pin 2 continues to move upward, ejecting the product from the mold. Due to the presence of guide sleeve 3, ejector pin 2 maintains linear motion throughout the entire ejection process, ensuring the accuracy of the ejection action.

[0031] 3. Reset Operation: After the product is ejected, the ejection drive structure on the mold resets and no longer presses against the bottom end of the limiting seat 4. At this time, the reset spring 7 begins to reset, pushing the limiting seat 4 downward and causing the ejector pin 2 to return to its initial position. The tapered inclined surface 21 on the ejector pin 2 gradually approaches and finally abuts against the tapered opening 51 inside the positioning sleeve 5, achieving precise positioning.

[0032] 4. Magnetic attraction: When the ejector pin 2 is fully reset, the first magnetic plate 22 and the second magnetic plate 52 re-attract each other, keeping the ejector pin 2 stable in this position and preventing shaking caused by non-human factors such as vibration.

[0033] 5. Length Adjustment: When it is necessary to adjust the extension length of the ejector pin 2, first rotate the upper nut 81 and lower nut 82 on the adjusting threaded rod 8 so that they no longer press against the connecting round plate 6. Then move the position of the connecting round plate 6. After the positioning sleeve 5 is moved to the required adjustment position, tighten the upper nut 81 and lower nut 82 to fix the position of the connecting round plate 6, thereby adjusting the extension length of the ejector pin 2.

[0034] Through the above design, this utility model can not only achieve more precise reset, but also flexibly adjust the extension length of the ejector pin 2 according to actual needs, thereby improving production efficiency and product quality.

[0035] The limiting seat 4 includes a main seat 41 and a cover seat 42. The main seat 41 has a convex groove 411 extending through one side, and a retaining seat 23 is integrally formed on the lower side of the ejector pin 2. The retaining seat 23 can be detachably inserted into the convex groove 411. The cover seat 42 is detachably fixed to the main seat 41 and is used to cover the opening of the convex groove 411. This structure facilitates the removal and installation of the limiting seat 4 from the ejector pin 2. Furthermore, the cover seat 42 is provided with a screw 43 for fixing to the main seat 41, and a pressing protrusion 421 is integrally formed on the cover seat 42 for inserting into the convex groove 411. The pressing protrusion 421 presses against the retaining seat 23 and the lower end of the ejector pin 2. The design of the screw 43 and the clamping protrusion 421 allows the cover seat 42 to be firmly fixed on the main seat 41. At the same time, the clamping protrusion 421 clamps the card seat 23 and the lower end of the ejector pin 2, further enhancing the stability of the overall structure.

[0036] It should be noted that the width of the retainer 23 is smaller than the inner diameter of the return spring 7. This structure ensures that the return spring 7 can be disassembled downwards to remove the ejector pin 2. The retainer 23 will not interfere with the return spring 7 disassembling from the ejector pin 2, thus facilitating the replacement of the return spring 7.

[0037] In this invention, both the main seat 41 and the pressing protrusion 421 are provided with spring positioning arc segments 44 on their upper sides. Three spring positioning arc segments 44 are provided on the main seat 41 and one on the pressing protrusion 421, resulting in four spring positioning arc segments 44 arranged equidistantly in a circle. The spring positioning arc segments 44 are located at the lower end of the inner diameter of the return spring 7. Additionally, an upper positioning ring 53 is fixedly connected to the lower side of the positioning sleeve 5, located at the upper end of the inner diameter of the return spring 7. The arrangement of the spring positioning arc segments 44 and the upper positioning ring 53 further enhances the positioning effect of the return spring 7, preventing the return spring 7 from shifting during compression and reset. The fact that the spring positioning arc segments 44 are divided into four will not interfere with the disassembly of the cover seat 42 and the main seat 41.

[0038] It should also be noted that the terms used in this utility model, such as "front", "rear", "vertical", "horizontal", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limiting the scope of protection of this utility model.

[0039] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. 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. A novel magnetic mounting type mold ejector pin comprising a positioning base plate and an ejector pin, characterized in that: The positioning base plate middle part is fixedly connected with a guide sleeve, the thimble slides up and down on the guide sleeve, the lower end of the thimble is detachably connected with a limiting seat body, the thimble is provided with a tapered inclined surface arranged from top to bottom at the position below the positioning base plate, the lower side of the positioning base plate is provided with a positioning sleeve, the positioning sleeve is provided with a tapered hole arranged from top to bottom, the tapered hole is used for abutting against the tapered inclined surface, the thimble is provided with a plurality of first magnetic plates at the position close to the tapered inclined surface, the positioning sleeve is provided with a plurality of second magnetic plates corresponding to the first magnetic plates at the position close to the tapered hole, and the limiting seat body and the positioning sleeve are provided with a return spring.

2. A novel magnetic mounting type mold ejector pin according to claim 1, characterized in that: The outer side wall of the positioning sleeve is integrally formed with a connecting circular plate, the lower end of the positioning base plate is fixedly connected with at least four adjusting threaded rods, the connecting circular plate is provided with a through hole for the adjusting threaded rods to pass through, and the adjusting threaded rods are uniformly distributed in a circle on the connecting circular plate. The upper nut and the lower nut are threadedly connected on each adjusting threaded rod, and the upper nut and the lower nut are respectively located on the upper side and the lower side of the connecting circular plate and are used for fixedly clamping the connecting circular plate.

3. A novel magnetic mounting type mold ejector pin according to claim 1, characterized in that: The limiting seat body comprises a main seat body and a cover seat body, the main seat body is provided with a convex slot penetrating through one side thereof, the thimble is integrally formed with a clamping seat on the lower side, the clamping seat is detachably clamped into the convex slot, and the cover seat body is detachably fixed on the main seat body and is used for covering the opening position of the convex slot.

4. A novel magnetic mounting type mold ejector pin according to claim 3, characterized in that: The width of the clamping seat is less than the inner diameter of the return spring.

5. A novel magnetic mounting type mold ejector pin according to claim 3, characterized in that: The cover seat body is provided with a screw rod for fixing the main seat body, the cover seat body is integrally formed with a pressing protrusion for being inserted into the convex slot, and the pressing protrusion is pressed on the clamping seat and the lower end of the thimble.

6. A novel magnetic mounting type mold ejector pin according to claim 5, characterized in that: The upper side of the main seat body and the pressing protrusion is provided with a spring positioning arc segment, the spring positioning arc segment is provided with three on the main seat body and one on the pressing protrusion, the four spring positioning arc segments are circumferentially equidistantly arranged, and the spring positioning arc segment is located at the lower end of the inner diameter of the return spring.

7. A new type of magnetically mounted mold ejector pin according to claim 1, characterized in that: The lower side of the positioning sleeve is fixedly connected with an upper positioning ring, and the upper positioning ring is located at the upper end of the inner diameter of the return spring.

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