Ejection anti-breaking protection mechanism

Abstract

The utility model discloses an ejection anti-breakage protection mechanism in an injection mold. The ejection anti-breakage protection mechanism comprises a lower mold fixing plate, and a driving mechanism is arranged on the lower mold fixing plate; a thick ejector pin is mounted on the large ejector pin seat, and the position of the large ejector pin seat is switched through a driving mechanism; the large ejector pin seat is provided with a thick ejector pin, the small ejector pin seat is provided with a thin ejector pin which is arranged in the same direction as the thick ejector pin, an elastic assembly is arranged between the lower die fixing plate and the large ejector pin seat, a supporting rod is arranged between the small ejector pin seat and the elastic assembly, and the supporting rod penetrates through a through hole in the large ejector pin seat. In the initial state of the mechanism, the large ejector pin seat extrudes the small ejector pin seat, and the elastic assembly is in a compressed state; ejection movement and stroke separation control of the small ejector pin with weak strength and other ejector pins with high strength are achieved on the mold, so that the length of the small ejector pin with weak strength on the mold is increased, the lifting strength is enhanced, the development cost is saved, the maintenance cost is reduced, and the competitiveness of the product market is improved.

Description

TECHNICAL FIELD

[0001] The application relates to the technical field of injection molds, in particular to a ejection anti-breaking protection mechanism. BACKGROUND

[0002] Plastic products are widely used in daily life. The plastic products are produced on an injection molding machine by using a plastic mold. Each product corresponds to a set of molds. Most of the plastic molds use ejector pins to eject the products. Some small features on the plastic products may cause the space on the mold to be insufficient to arrange large-diameter and high-strength ejector pins, such as horn features and small ribs. Due to the product modeling structure, these areas can only arrange small-diameter and low-strength ejector pins to eject these features. The small ejector pins and the ejector pins arranged in other areas on the product are fixed on the ejector pin plate and are ejected or returned at the same time during molding. Therefore, the length and stroke of the small ejector pins are affected by the stroke of the other ejector pins in the same set of molds. If the stroke of the other ejector pins in the same set of molds is large, the length of the small ejector pins will also be lengthened accordingly. The small ejector pins are thin and long, and even if a support is designed, the length of the support will be limited by the stroke of the other ejector pins. During molding, the small ejector pins are prone to breaking due to their low strength, resulting in low production efficiency and high maintenance cost. If some special mechanisms are used in the mold design to avoid this situation, the mold mechanism will be complex and the cost will be high. CONTENT OF THE UTILITY MODEL

[0003] The application aims to provide an ejection anti-breaking protection mechanism. Based on the traditional mold structure design, the small ejector pins are often designed to be very long without using some special mechanisms, and the risk of breaking during use is high.

[0004] To achieve the above-mentioned purpose, the application adopts the following technical scheme:

[0005] The application discloses an ejection anti-breaking protection mechanism, which comprises

[0006] A lower mold fixed plate is provided with a driving mechanism;

[0007] A large ejector pin seat is provided with a coarse ejector pin. The large ejector pin seat is switched in position by the driving mechanism;

[0008] A small ejector pin seat is provided with a small ejector pin arranged in the same direction as the coarse ejector pin. An elastic component is arranged between the lower mold fixed plate and the large ejector pin seat. A support rod is arranged between the small ejector pin seat and the elastic component. The support rod passes through the through hole in the large ejector pin seat. In the initial state of the mechanism, the large ejector pin seat presses the small ejector pin seat, and the elastic component is in a compressed state.

[0009] Further, the large ejector seat is provided with a male mold plate, the male mold plate is matched with a molded product, the driving mechanism drives the large ejector seat to move towards the male mold plate, and the coarse ejector pin and the fine ejector pin perform the ejection work.

[0010] Further, the small ejector seat comprises an upper fixed block and a lower fixed block which are fixedly connected, the fine ejector pin is fixed on the upper fixed block, the lower fixed block is fixedly connected with the supporting rod, the male mold plate is provided with a first guide rod on the side facing the upper fixed block, the upper fixed block is provided with a first guide sleeve, and the small ejector seat is moved to make the first guide rod and the first guide sleeve cooperate.

[0011] Further, the supporting rod is in plurality, and the plurality of supporting rods are arranged in matrix between the elastic assembly and the small ejector seat.

[0012] Further, the elastic assembly comprises a connecting plate, a spring and a second limiting block.

[0013] The second guide assembly is movably arranged on the connecting plate, one side of the second guide assembly passes through the connecting plate and is fixedly connected with the lower mold fixed plate, the spring is sleeved on the second guide assembly between the connecting plate and the lower mold fixed plate, and the spring elastically releases the connecting plate.

[0014] Further, the second guide assembly comprises a second guide rod and a second guide sleeve, the second guide sleeve is arranged on the connecting plate, the spring is arranged on a section of the second guide rod which passes through the second guide sleeve and is adjacent to the lower mold fixed plate, and the second guide rod is fixedly connected with the second limiting block at the end close to the large ejector seat.

[0015] Further, the number of the second guide assembly and the supporting rod is in plurality, and the plurality of second guide assemblies and the plurality of supporting rods are staggered.

[0016] Further, the large ejector seat is provided with a limiting groove at the bottom, and the elastic assembly is arranged in the limiting groove.

[0017] Further, the fine ejector pin is provided with a supporting high layer at one end, and the supporting high layer is fixedly connected with the small ejector seat.

[0018] The beneficial effects of the present application are as follows.

[0019] The protection structure in the application can protect the thin ejector pin, greatly reduce the length of the thin ejector pin in design, realize the separation control of the ejection movement and stroke of the thin ejector pin with high strength and other ejector pins with high strength on the mold, and only need the displacement amount actually required by the thin ejector pin, so as to improve the length of the thin ejector pin with high strength and weak strength on the mold, enhance the supporting height and improve the strength, save the development cost, reduce the maintenance cost, and improve the competitiveness of the product in the market.

[0020] The elastic component of the mechanism is provided with a second guide component capable of limiting position, so as to ensure the displacement amount of the thin ejector pin, and the structure is strong in protection, and the precision of ejection can be ensured. BRIEF DESCRIPTION OF DRAWINGS

[0021] Figure 1 Figure 6 is a schematic view of the public mold plate side axial section in the mold closing state of the ejection breakage protection mechanism in the application;

[0022] Figure 2 Figure 7 is a schematic view of the part structure in the application; Figure 1

[0023] Figure 3 Figure 8 is a schematic view of the public mold plate side axial section in the mold opening state of the ejection breakage protection mechanism in the application;

[0024] Figure 4 Figure 9 is a schematic view of the part structure in the application; Figure 3

[0025] Figure 10 is a schematic view of the ejection breakage protection mechanism in the application; Figure 5

[0026] Figure 6 Figure 11 is an exploded view of the ejection breakage protection mechanism in the application.

[0027] Wherein:

[0028] 1, thin ejector pin; 2, upper fixed block; 3, lower fixed block; 4, first guide rod; 5, first guide sleeve; 6, supporting rod; 7, connecting plate; 8, second guide rod; 9, second guide sleeve; 10, second limiting block; 11, stopper; 12, spring; 13, male mold pin; 14, public mold plate; 15, upper ejector pin plate; 16, lower ejector pin plate; 17, lower mold fixed plate; 18, return pin; 19, driving mechanism; 20, thick ejector pin; 23, ejector pin plate limiting block; 24, product; 25, supporting height layer. DETAILED DESCRIPTION

[0029] ​​Clearly, the described embodiments are merely a part of the embodiments of the present application, rather than all the embodiments. The description of the at least one example embodiment is merely illustrative, and is by no means intended to limit the present application and its application or use in any way.

[0030] As shown in Figure 1 and Figure 2 , the present embodiment discloses a ejection anti-breaking protection mechanism, which comprises a lower mold fixed plate 17, a large ejector pin seat and a small ejector pin seat, the lower mold fixed plate 17 is provided with a driving mechanism 19; the large ejector pin seat is provided with a coarse ejector pin 20, and the large ejector pin seat is switched in position by the driving mechanism 19; in the present embodiment, the lower mold fixed plate 17, the large ejector pin seat and the small ejector pin seat are arranged from bottom to top, the small ejector pin seat is provided with a fine ejector pin 1 arranged in the same direction as the coarse ejector pin 20, an elastic component is arranged between the lower mold fixed plate 17 and the large ejector pin seat, a supporting rod 6 is fixed between the small ejector pin seat and the elastic component, and the supporting rod 6 passes through a through hole in the large ejector pin seat; wherein, in the initial state of the mechanism, the large ejector pin seat is forced to extrude the small ejector pin seat, and the elastic component is in a compressed state, and the elastic component in the compressed state is prepared for the subsequent ejection action of the fine ejector pin 1.

[0031] In use, the driving mechanism 19 drives the large ejector pin seat to move upwards, at this time the elastic component is released from the constraint, and under the release of the elastic potential energy, the elastic component pushes the supporting rod 6 to move the small ejector pin seat upwards until it is limited by the limiting part in the elastic component, at this time the large ejector pin seat can still move, realizing large displacement of the coarse ejector pin 20 and small displacement of the small ejector pin, reducing the design length of the fine ejector pin 1 and enhancing the use strength; in actual production, the driving mechanism 19 can use an oil cylinder or an air cylinder as a driving device.

[0032] As shown in the accompanying Figure 1As shown, the upper part of the large ejector seat in the embodiment is provided with a male mold plate 14, the male mold plate 14 is provided with an inserted male mold pin 13, which is used for facilitating processing and improving exhaust optimization molding. After production, the matching molded product 24 is formed on the male mold plate 14. The driving mechanism 19 drives the large ejector seat to move towards the male mold plate 14. The coarse ejector pin 20 and the fine ejector pin 1 perform the ejection operation. In actual production, a female mold plate is also arranged above the male mold plate 14. The product 24 is molded and cooled by folding the male and female mold plates. In the embodiment, the large ejector seat is provided with a needle return 18 on both sides. The needle return 18 facilitates the assembly of the male mold side parts. When the mold is closed, the needle return 18 plays a role in pressing the large ejector seat, which is fast and convenient. Under normal circumstances, the large ejector seat is composed of two plates for the convenience of component installation. In the embodiment, the large ejector seat is fixedly connected by a bolt between the upper ejector plate 15 and the lower ejector plate 16. The upper ejector plate 15 is used to fix a plurality of coarse ejector pins 20, and the lower ejector plate 16 abuts against the elastic assembly. Considering the safety in use, the edge of the upper ejector plate 15 is also bolted with an ejector plate limiting block 23.

[0033] As shown in the accompanying drawings, Figure 2 The small ejector seat in the embodiment includes an upper fixed block 2 and a lower fixed block 4 fixedly connected in sequence. The two are fixedly connected by a bolt. The fine ejector pin 1 is fixedly installed on the upper fixed block 2. The lower fixed block 4 is fixedly connected with the supporting rod 6. The side of the male mold plate 14 facing the upper fixed block 2 is provided with a first guide rod 4. The upper fixed block 2 has a first guide sleeve 5. When working, the small ejector seat moves, so that the first guide rod 4 and the first guide sleeve 5 cooperate. The cooperation between the first guide sleeve 5 and the first guide rod 4 ensures the accuracy of the path when the fine ejector pin 1 moves.

[0034] In a further embodiment, the supporting rod 6 is designed as four. The four supporting rods 6 are installed in matrix between the elastic assembly and the small ejector seat. This design ensures the connection strength of the elastic assembly and the small ejector seat, and ultimately improves the overall strength of the structure.

[0035] As shown in the accompanying drawings, Figure 3 , Figure 5 and Figure 6 The elastic assembly in the embodiment is basically released by a compressed spring 12. The elastic assembly includes a connecting plate 7, a spring 12 and a second limiting block. The second guide assembly is movably provided on the connecting plate 7. One side of the second guide assembly passes through the connecting plate 7 and is fixedly connected with the lower mold fixed plate 17. The spring 12 is sleeved on the second guide assembly between the connecting plate 7 and the lower mold fixed plate 17. The spring 12 elastically releases the connecting plate 7. The second guide assembly in the embodiment includes a second guide rod 8 and a second guide sleeve 9. The second guide sleeve 9 is installed on the connecting plate 7 and longitudinally penetrates the connecting plate 7. The spring 12 is installed on the section of the second guide rod 8 penetrating the second guide sleeve 9 and adjacent to the lower mold fixed plate 17. The end of the second guide rod 8 close to the large ejector seat is fixedly provided with the second limiting block. The second limiting block can be screwed or riveted on the second guide rod 8.

[0036] In a further embodiment, the positions of the second guide sleeve 9 and the supporting rod 6 are arranged, four mounting holes are opened in the array of the connecting plate 7 in production, the second guide sleeve 9 is fixed in the mounting hole, at this time, one supporting rod 6 is arranged between two adjacent second guide sleeves 9, which are arranged in cross staggered manner, thereby improving the overall strength of the mechanism.

[0037] In a further embodiment, a limiting groove is opened in the bottom of the large ejector pin seat, the connecting plate 7 is placed in the limiting groove when it is compressed; the second limiting block 11 of the stopper 10 is bolted on the lower die fixed plate 17 at the bottom of the limiting groove; the spring 12 is prevented from being excessively compressed, thereby improving the safety performance in use; in addition, the high layer 25 is arranged at one end of the thin ejector pin 1, the high layer 25 serves as a reinforcing layer of the thin ejector pin 1, which can improve the structural strength of the thin ejector pin 1 itself, and the high layer 25 is fixedly connected with the upper fixed block 2.

[0038] Specific use;

[0039] In the overall use of the device, first, the male and female molds are closed for operation, during which the product 24 is obtained by injection molding and cooling forming, at this time, the male and female molds are opened, details are not described here, the product 24 is attached to the male mold plate 14, then the ejection operation is performed, here, the hole in the product is ejected, the driving mechanism 19 is started to drive the large ejector pin seat to move to the product 24, the initial spring 12 is compressed, under the release of the spring 12, the connecting plate 7 pushes the thin ejector pin 1 to move to the product 24, until it is limited by the second limiting block on the second guide rod 8, at this time, the thin ejector pin 1 meets the requirement of the ejection stroke S2, the driving mechanism 19 continues to drive the thick ejector pin 20 to move, until it completes the required ejection stroke S1; here, S2 < S1, the thin ejector pin 1 does not need to perform redundant stroke action with the thick ejector pin 20, thereby greatly reducing the risk of breakage.

[0040] In the description of the present application, it should be understood that the orientations or positional relationships indicated by the terms "center", "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like are based on the orientations or positional relationships shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the devices or elements indicated must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application. In addition, the terms "first", "second" and the like are only for the purpose of description, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the technical features indicated. Therefore, the features limited by "first", "second" and the like can explicitly or implicitly include one or more of the features. In the description of the present application, unless otherwise stated, the meaning of "a plurality of" is two or more.

[0041] In the description of the application, it should be explained that, unless otherwise explicitly specified and limited, the terms "mounting", "connection", "connection" should be understood broadly, for example, it can be fixed connection, or detachable connection, or integral connection; it can be mechanical connection, or electrical connection; it can be directly connected, or indirectly connected through intermediate medium, or the communication inside two elements. For ordinary skilled in the art, the specific meaning of the above terms in the application can be understood through specific circumstances.

Claims

1. An ejection break-off protection mechanism characterized by, The utility model relates to a moulding mechanism for moulding products, which comprises: a lower mould fixing plate (17) provided with a driving mechanism (19); a large ejector pin seat provided with a rough ejector pin (20) and capable of switching position by the driving mechanism (19); a small ejector pin seat provided with a fine ejector pin (1) arranged in the same direction as the rough ejector pin (20), and provided with an elastic component between the lower mould fixing plate (17) and the large ejector pin seat, and provided with a supporting rod (6) between the small ejector pin seat and the elastic component, and the supporting rod (6) passes through a through hole in the large ejector pin seat; wherein, in the initial state of the mechanism, the large ejector pin seat presses the small ejector pin seat, and the elastic component is in a compressed state.

2. The ejection break-off protection mechanism of claim 1, wherein A male mould plate (14) is arranged above the large ejector pin seat, the male mould plate (14) is matched with a moulded product (24), the driving mechanism (19) drives the large ejector pin seat to move towards the male mould plate (14), and the rough ejector pin (20) and the fine ejector pin (1) perform ejection work.

3. The ejection break-off protection mechanism of claim 2, wherein, The small ejector pin seat comprises an upper fixed block (2) and a lower fixed block (3) fixedly connected in sequence, the fine ejector pin (1) is fixed to the upper fixed block (2), the lower fixed block (3) is fixedly connected to the supporting rod (6), a first guide rod (4) is arranged on the side of the male mould plate (14) facing the upper fixed block (2), a first guide sleeve (5) is arranged on the upper fixed block (2), and the small ejector pin seat moves so that the first guide rod (4) cooperates with the first guide sleeve (5).

4. The ejection break-off protection mechanism of claim 1, wherein The supporting rod (6) is in the form of a plurality of rods, and the plurality of supporting rods (6) are arranged in a matrix between the elastic component and the small ejector pin seat.

5. The ejection break-off protection mechanism of claim 1, wherein, The elastic component comprises a connecting plate (7), a spring (12) and a second limiting block. A second guide component is movably arranged on the connecting plate (7), one side of the second guide component passes through the connecting plate (7) and is fixed to the lower mould fixing plate (17), the spring (12) is arranged on the second guide component between the connecting plate (7) and the lower mould fixing plate (17), and the spring (12) elastically releases the connecting plate (7).

6. The ejection break-off protection mechanism of claim 5, wherein, The second guide component comprises a second guide rod (8) and a second guide sleeve (9), the second guide sleeve (9) is arranged on the connecting plate (7), the spring (12) is arranged on the section of the second guide rod (8) passing through the second guide sleeve (9) and adjacent to the lower mould fixing plate (17), and a second limiting block is fixed to the end of the second guide rod (8) close to the large ejector pin seat.

7. The ejection break-off protection mechanism of claim 5, wherein, The number of the second guide component and the supporting rod (6) is both multiple, and the plurality of second guide components and the plurality of supporting rods (6) are arranged alternately.

8. The ejection break-off protection mechanism of claim 1, wherein, A limiting groove is arranged at the bottom of the large ejector pin seat, and the elastic component is arranged in the limiting groove.

9. The ejection break-off protection mechanism according to any one of claims 1 to 8, characterized in that One end of the fine ejector pin (1) is provided with a high supporting layer (25), and the high supporting layer (25) is fixedly connected to the small ejector pin seat.

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