CN116100769A - Mold ejection mechanism - Google Patents

Abstract

The invention provides an ejection mechanism of a mold, and belongs to the technical field of injection molds. It has solved the problem that production efficiency is low. The movable die comprises a top plate positioned below a movable die, a first ejector rod and a second ejector rod which are all arranged in the movable die in a penetrating way, wherein the lower end of the first ejector rod is fixed with the top plate, the upper end of the second ejector rod is fixed with a top block embedded in the top of the movable die, a linkage structure which enables the top plate to drive the second ejector rod to move upwards synchronously is arranged between the lower end of the second ejector rod and the top plate, the outer side of the second ejector rod is provided with a propping part which can prop against the movable die to enable the top plate to release linkage with the second ejector rod, the top block is provided with a through hole, a core rod and a top spring are arranged in the through hole, one end of the core rod is positioned at a notch of the top block and the top spring acts on the core rod in a direction away from the notch, and one side wall of the movable die in the embedded position of the top block is obliquely arranged, and the other end of the core rod props against the side wall. It has the advantages of improving the production efficiency of the product, etc.

Description

Mold ejection mechanism

technical field

The invention belongs to the technical field of injection molds and relates to an ejection mechanism of a mold.

Background technique

Molding compound injection mold is the most commonly used molding mold in the production of thermoplastic products. It includes a fixed mold and a movable mold set under the fixed mold. After entering the cavity, the product with the same shape as the cavity can be formed. After the product is formed, the movable mold and the fixed mold are separated to complete the mold opening. Generally speaking, the product is adsorbed on the movable mold after the mold is opened. side. With the popularity of manipulators, the degree of automation in the injection molding industry is getting higher and higher, and thus a streamlined production of automatic product ejection and automatic pick-up with manipulators has been formed.

Among them, the automatic ejection of the product relies on setting the ejection mechanism on the mold, specifically on the side of the movable mold. For products with relatively regular and flat shapes, the structure of the ejection mechanism is relatively simple. It consists of a top plate that is located under the movable mold and driven by a hydraulic cylinder and can move upwards, and a number of ejector pins that pass through the movable mold and whose lower ends are fixed to the top plate. The top plate drives each ejector pin to move upwards to automatically push the product And further, in order to ensure the stable ejection of the product, a top block will be embedded on the top of the movable mold (of course, the top surface of the top block is also the cavity surface that forms the cavity together with the top surface of the movable mold), and then the Some ejector pins are fixed with the ejector block. Here, for the convenience of distinguishing, the ejector pin directly acting on the product is called ejector pin 1 and the ejector pin fixed with the ejector block is called ejector pin 2. Push rod one and push rod two move upwards. However, for products that are not too regular in shape and need to form a protruding part toward the side of the movable mold, a gap needs to be provided on one side of the top block to match the side wall of the movable mold where the top block is embedded to form a gap with the mold. The cavity is connected to the forming groove, so that the molten plastic will also be injected into the forming groove to form the above-mentioned protrusion when it is injected into the cavity. Since the formed protrusion is buckled on the top block, Therefore, it is necessary to set the ejection action of the product as a two-stage type, in which the first stage is still the product is ejected by the top plate moving upward with the ejector pin 1 and the ejector pin 2, and the second stage is the top plate with the top Rod 1 continues to move upward relative to ejector rod 2 to separate the part where the product is buckled on the ejector block from the ejector block. For its structure, refer to a secondary ejection mechanism disclosed in patent application No. 201410197888.2, for example.

According to actual needs, it is sometimes required to have a hole on the above-mentioned protruding part. The ideal way is to have this hole directly after the product is injection molded. It is difficult to realize the core-pulling and demoulding at the hole position by using the traditional inclined-top core-pulling mechanism for the slider on the movable mold. Go up to process the required hole position, so there is a problem of relatively low production efficiency.

Contents of the invention

The object of the present invention is to propose a mold ejection mechanism to solve the problem of low production efficiency in view of the above-mentioned problems in the prior art.

The purpose of the present invention can be achieved through the following technical solutions:

The ejection mechanism of the mold includes the top plate located under the movable mold and the ejector pin one and the ejector pin two which are both pierced in the movable mold. The lower end of the ejector pin is fixed to the top plate, and the upper end of the ejector pin two is embedded in the movable mold The top block with a gap on one side of the top is fixed, and there is a linkage structure between its lower end and the top plate that enables the top plate to drive the two ejector pins to move up synchronously. The abutting part for releasing the linkage of the second rod is characterized in that the top block is provided with a through hole, and a core rod and a pressing spring are arranged in the through hole, and one end of the core rod protrudes out of the through hole and is located in the gap of the top block and the top pressure spring acts on the core rod in the direction away from the notch, the side wall of the movable mold in the position where the top block is embedded is inclined and the other end of the core rod is against the side wall, and the top plate drives the top rod 2 to move upward. During the process, a gap is formed between the top block and the side wall for the core rod to move away from the notch.

The ejection mechanism is provided with a through hole on the top block, and a core rod is set in the through hole, one end of the core rod is against the side wall of the movable mold in the position where the top block is embedded, and the other end extends out of the through hole. And it is located at the gap of the top block, so that when the molten plastic is injected into the mold, the part of the molded product that is buckled at the gap can be directly brought There are holes. Moreover, the through hole is also provided with a pressing spring acting on the core rod in the direction away from the notch, and the side wall of the movable mold that is in the position where the top block is embedded and abuts against one end of the core rod is inclined, and the top plate drives the two push rods upward. During the process of moving until the abutting part abuts against the movable mold (that is, a section of ejection process of the product), a gap is formed between the top block and the side wall for the core rod to move away from the notch. With the continuous upward movement of the ejector rod 2, it becomes larger and larger, so that the core rod can continuously move away from the gap under the action of the ejector spring while moving up with the ejector block to automatically complete the reverse buckle with the product Partial detachment at the notch of the top block, that is to say, the core rod has been separated from the product after the first ejection of the product, so that the product can still be successfully buckled at the notch of the top block when the product is ejected in the second stage. Normal separation of part from top block. Through the above setting, the product with holes on the undercut part can be directly produced by the mold while ensuring that the product can be ejected normally, and there is no need to process the holes after the product is injection molded, thereby improving the production efficiency of the product.

In the ejection mechanism of the above-mentioned mold, the through hole is a stepped hole and its smaller size part communicates with the gap, the core rod has a head located in the larger part of the through hole size and a smaller size through the through hole. For the rod outside the part, the pressing spring is sleeved outside the rod in the larger part of the through hole, and its two ends are respectively against the head and the step surface in the through hole.

The core rod mainly uses the rod part so that the part of the molded product buckled on the top block has the required hole position, and the top pressure spring is sleeved outside the rod part in the larger part of the through hole, and its two The ends of the core rod are respectively against the head of the core rod and the step surface in the through hole, so that the elastic force of the pressing spring acts on the core rod in the direction that the end of the core rod at the notch of the top block is retracted into the through hole. In this way, when the head of the core rod is ejected with a section of the product and separated from the side wall of the movable mold where the top block is embedded, the core rod and the product can be automatically separated by means of the top pressure spring, so that the core rod will not be affected. While the product is normally ejected, the mold can use the core rod to directly produce the product with holes on the undercut part, thereby improving the production efficiency of the product.

In the above-mentioned ejection mechanism of the mold, there is a slot running through the top of the movable mold, the top block is located in the slot, and the outer side of the head has a guide surface. When the top plate resets and moves down, the guide surface can move along the slot. The edge of the notch moves and compresses the top pressure spring.

When a section of the product is ejected, the top block part protrudes out of the slot and the head of the core rod is no longer restricted by the slot wall of the slot, and automatically protrudes under the action of the top pressure spring. The through hole is larger in size. Parts outside, so as to realize the automatic separation of the core rod and the product. When the top plate resets and moves down, the guide surface outside the head of the core rod moves along the edge of the notch of the slot to make the core rod gradually compress the top pressure spring, so that the rod part of the core rod can extend from the through hole into the top block. In order to ensure that the mold can use the core rod to directly produce products with holes on the undercut part to improve the production efficiency of the product.

In the above-mentioned ejection mechanism of the mold, the side of the top block is provided with a mounting groove that communicates with the larger part of the through hole, and the outside of the head of the core rod has an abutment step, and a part is fixed in the mounting groove A limiting stopper in the larger portion of the through hole and capable of abutting against the step.

Through the above settings, the moving distance of the core rod under the elastic force of the top pressure spring can be limited, preventing the core rod from extending too far and making it impossible to use the guide surface 1 or guide surface 2 to reset when the top plate is reset and moved down, ensuring that the mold Reliability of using mandrels to directly produce products with holes in the undercut portion.

In the ejection mechanism of the above-mentioned mold, a positioning seat with an installation cavity is fixed on the top plate, the lower end of the second ejector rod is located in the installation cavity, and the linkage structure includes a support spring located in the installation cavity, and a support spring located at the second lower end of the ejector rod. The outer annular shoulder and the annular shoulder protruding from the inner wall of the installation cavity, the second push rod passes through the center of the annular shoulder, and the two ends of the support spring are respectively against the bottom wall of the installation cavity and the lower end of the second ejector rod. Make the upper side wall of the annular shoulder abut against the lower side wall of the annular shoulder.

The elastic force of the support spring acts upward on the push rod 2, so that the upper side wall of the annular shoulder at the lower end of the push rod 2 abuts against the lower side wall of the annular shoulder protruding from the inner wall of the installation cavity, so that when the top plate just starts to move upward At the same time, the ejector pin 2 can be moved synchronously by means of the above-mentioned cooperation, so that the ejector pin 1 and the ejector pin 2 can be driven to move synchronously when the top plate initially moves to complete a stage of ejection of the product; , the upward movement of the ejector rod 2 is blocked, and the support spring is compressed so that the top plate can continue to move upward relative to the ejector rod 2, thereby completing the second-stage ejection of the product through the further movement of the ejector rod 1 to make the product The part of the undercut at the notch of the top block is separated from the top block.

Through the mutual cooperation of the support spring, the annular retaining shoulder and the annular shoulder, the top plate can initially stably drive the ejector rod 2 to move upward, ensuring the reliability of the product when it is ejected. On both sides, the friction force generated by the plunger’s top pressure is used to drive the ejector rod 2 to move upward. Since the direction of the plunger’s force is perpendicular to the moving direction of the ejector rod 2, it is prone to slipping and cause The product cannot be ejected smoothly.

In the ejection mechanism of the above-mentioned mold, the positioning seat includes a lower seat body fixedly connected to the top plate by fasteners and an upper seat body screwed on the lower seat body, and the installation cavity is formed by the lower seat body and the upper seat body. Formed after connection, the ring-shaped shoulder is located on the upper body.

Specifically, when assembling, the support spring is placed on the lower seat body, and then the push rod 2 is passed through the upper seat body from bottom to top, and the upper seat body is threaded on the lower seat body to form a positioning seat, which is formed between the upper seat body and the lower seat body. The installation cavity enables the elastic force of the support spring to act upward on the push rod two, and finally the positioning seat is fixed to the top plate by fasteners. Thus, the second push rod, the support spring and the positioning seat constitute an independent assembly, which facilitates later maintenance.

In the ejection mechanism of the above-mentioned mold, the ejector rod 2 includes a main rod body and an auxiliary rod body, the lower end of the auxiliary rod body is located in the positioning seat, the upper end of the auxiliary rod body has a connecting hole, and the lower end of the main rod body is plugged into the connecting hole. And the main rod body and the auxiliary rod body are fixed through the connecting screw that passes through the auxiliary rod body from bottom to top and is threadedly connected to the lower end of the main rod body. through the operation hole.

By setting the push rod two to include the main rod body and the auxiliary rod body, and making the two pass through the auxiliary rod body from bottom to top through the rod portion and screwed into the connecting screw in the lower end of the main rod body, the auxiliary rod body and the main rod body can be fixed. Disassemble the connection. At the same time, the lower base body is fixed on the bottom of the top plate and an operation hole communicating with the installation cavity is provided at the bottom of the lower base body, so that the staff can directly insert a screwdriver from the operation hole into the installation cavity to remove the connecting screw, thereby The staff can dismantle the entire ejection mechanism except the main rod without involving the jack block, which further improves the convenience of later maintenance.

Compared with the prior art, the ejection mechanism of this mold is provided with a through hole on the top block, and a core rod is arranged in the through hole. One end of the core rod is against the side wall of the movable mold where the top block is embedded, and the other end of the core rod One end protrudes out of the through hole and is located at the notch of the top block. When the molten plastic is injected into the mold, the part of the molded product that is protruded from the notch of the top block can be reversed by the existence of the end of the core rod protruding from the notch. Can be directly provided with holes, thereby increasing production efficiency. At the same time, by setting the pressing spring in the through hole to act on the core rod in the direction away from the notch and setting the side wall of the movable mold where the ejector block is embedded at an incline, during the process of ejecting the product once A larger and larger gap is formed between the block and the side wall of the movable mold so that the core rod can continuously move away from the gap by the elastic force of the pressing spring to automatically complete the separation of the core rod from the product, thereby ensuring the setting of the core rod It will not affect the normal ejection action of the product.

Description of drawings

Fig. 1 is a sectional view of the ejection mechanism of the mold.

Fig. 2 is an enlarged cross-sectional view of the linkage structure between the second lower end of the ejector rod and the top plate in Fig. 1 .

Fig. 3 is an enlarged cross-sectional view of the top block in Fig. 2 .

Fig. 4 is a side view of the side of the top block where the larger part of the through hole is located.

Fig. 5 is a schematic cross-sectional view along A-A in Fig. 4 .

Fig. 6 is a cross-sectional view of the ejection mechanism of the mold after a stage of ejection is completed.

Fig. 7 is an enlarged cross-sectional view of the top block in Fig. 6 .

Fig. 8 is a cross-sectional view of the ejection mechanism of the mold after the second-stage ejection is completed.

In the figure, 1, moving mold; 1a, embedding groove; 2, top block; 2a, notch; 2b, through hole 2c, installation groove; 3, top plate; 3a, relief hole 1; 4, ejector rod 1; 5, Push rod two; 5a, abutting part; 5b, annular shoulder; 5c, main rod body; 5d, auxiliary rod body; 6, positioning seat; 6a, installation cavity; 6b, annular shoulder; Operation hole; 6d, upper base; 7, support spring; 8, core rod; 8a, head; 8a1, guide surface; 11, the base; 11a, the connecting column; 11b, the seat plate; 11b1, the second relief hole; 12, the connecting screw.

Detailed ways

The following are specific embodiments of the present invention and in conjunction with the accompanying drawings, the technical solutions of the present invention are further described, but the present invention is not limited to these embodiments.

As shown in Figure 1, Figure 2 and Figure 3, the ejection mechanism of the mold includes a top plate 3 located below the movable mold 1 and capable of moving upwards, and a ejector pin 4 and a ejector pin 2 5 that are both installed in the movable mold 1. (In reality, the number of ejector pins 4 is several, and only one is shown in this embodiment), the base 11 is fixed below the movable mold 1, the top plate 3 is arranged on the inner side of the base 11 and the bottom of the base 11 is connected with a hydraulic pressure Cylinder (not shown in the figure), the top plate 3 is fixedly connected with the upper end of the piston rod of the hydraulic cylinder, so that when the piston rod of the hydraulic cylinder is pushed out upwards, the top plate 3 can be driven to move upward or the piston rod of the hydraulic cylinder can be driven to move upward. Just can pull top board 3 to move downwards and reset when retracting downwards and reset. Among them, the movable mold 1 is provided with a positioning hole 1 through which both ends penetrate and a positioning hole 2 penetrated at both ends, the upper end of the positioning hole 1 runs through the top of the movable mold 1, and the ejector pin 4 is pierced in the positioning hole 1 And its lower end is fixed with the top plate 3, the upper end opening of the positioning hole 2 is connected with the movable mold 1 where the top block 2 is embedded, the ejector rod 2 5 is set in the positioning hole 2 and its upper end is embedded in the top of the movable mold 1 The top block 2 with a notch 2a on one side is fixed. In practice, the movable mold 1 has a slot 1a that runs through its top. The top block 2 is located in the slot 1a. The upper end of the positioning hole 2 and the slot 1a connected. There is a linkage structure between the lower end of the ejector rod 25 and the top plate 3, which can make the two move up synchronously. The outer side of the ejector rod 25 has an abutment part that can abut against the movable mold 1 to release the linkage between the top plate 3 and the ejector rod 25. 5a.

In this embodiment, as shown in Figures 1 and 2, a positioning seat 6 with an installation cavity 6a is fixed on the top plate 3, the lower end of the push rod 2 5 is located in the installation cavity 6a, and the linkage structure includes a support located in the installation cavity 6a The spring 7, the annular shoulder 5b located outside the lower end of the push rod 2 5 and the annular shoulder 6b protruding from the inner wall of the installation cavity 6a, the push rod 2 5 passes through the center of the ring shoulder 6b, and the two ends of the support spring 7 are respectively Abut against the bottom wall of the installation cavity 6a and the lower end of the push rod 2 5 and make the upper side wall of the annular shoulder 5b and the lower side wall of the annular shoulder 6b abut. The elastic force of the support spring 7 acts upward on the push rod 2 5, so that the upper side wall of the annular shoulder 5b at the lower end of the push rod 2 5 abuts against the lower side wall of the annular shoulder 6b protruding from the inner wall of the installation cavity 6a, so that When the top plate 3 just starts to move upwards, the above-mentioned cooperation enables the two ejector pins 5 to move synchronously, that is, to form a linkage, so that when the top plate 3 initially moves, it can drive the ejector pin one 4 and the ejector pin two 5 to move synchronously to complete the product One section of ejection, the state after a section of ejection is shown in Figure 6 and Figure 7; It is compressed so that the top plate 3 can continue to move up relative to the ejector pin 2, that is, the linkage between the top plate 3 and the ejector pin 2 5 is released, so that the second-stage ejection of the product can be completed through the further movement of the ejector pin 4. The part of the product buckled at the notch 2a of the top block 2 is separated from the top block 2, and the state after the two-stage ejection is completed is shown in FIG. 8 . The positioning seat 6 includes a lower base body 6c fixedly connected to the top plate 3 by fasteners and an upper base body 6d threaded on the lower base body 6c. The installation cavity 6a is formed by connecting the lower base body 6c with the upper base body 6d. The annular shoulder 6b is located on the upper seat body 6d. Push rod two 5 comprises main rod body 5c and auxiliary rod body 5b, and the lower end of auxiliary rod body 5b is positioned in positioning seat 6, and the upper end of auxiliary rod body 5b has connecting hole, and the lower end of main rod body 5c is plugged in the connecting hole and main rod body 5c is connected with auxiliary rod body 5c. The rod body 5d is fixed by the connecting screw that passes through the secondary rod body 5d from bottom to top and is threadedly connected to the lower end of the main rod body 5c through the rod portion. Two apertures. In this embodiment, the top plate 3 is provided with a relief hole 3a, the lower seat 6c is fixedly connected to the bottom of the top plate 3, and the upper seat 6d is located in the relief hole 3a, and the bottom of the lower seat 6c is provided with and installed The chamber 6a communicates with the operating hole 6c1. The base 11 includes a connecting column 11a fixedly connected to the bottom of the movable mold 1 and a seat plate 11b fixedly connected to the connecting column 11a by a fastener. The seat plate 11b is provided with a relief hole 11b1, and the bottom of the lower seat body 6c is located at Make way for hole two 11b1.

Further, as shown in Fig. 1, Fig. 2, Fig. 4 and Fig. 5, a through hole 2b is provided on the top block 2, and a core rod 8 and a pressing spring 9 are arranged in the through hole 2b, and one end of the core rod 8 protrudes through the through hole 2b. The hole 2b is located in the notch 2a of the top block 2, and the pressure spring 9 acts on the core rod 8 in the direction away from the notch 2a. The side wall of the movable mold 1 in the position where the top block 2 is embedded is inclined, that is, the socket 1a The groove wall on one side is inclined, and the other end of the core rod 8 rests on the side wall, and when the top plate 3 drives the push rod 2 and 5 to move upwards synchronously, there is formed between the side wall and the top block 2 for the core rod 8 to move away from. The clearance for movement in the direction of the notch 2a. Specifically, the through hole 2b is a stepped hole, the smaller part of the through hole 2b communicates with the notch 2a on the side of the top block 2, the core rod 8 has a head 8a located in the larger part of the through hole 2b and a through hole The rod part 8b outside the smaller part of the hole 2b, the pressing spring 9 is sleeved outside the rod part 8b in the larger part of the through hole 2b, and its two ends are respectively against the head 8a and the part in the through hole 2b. on the step surface. There is a guide surface 8a1 outside the head 8a, and when the top plate 3 resets and moves down, the guide surface 8a1 can move along the notch edge of the socket 1a and compress the pressing spring 9. Further, the side of the top block 2 is provided with a mounting groove 2c communicating with the larger part of the through hole 2b, and the outside of the head 8a of the core rod 8 has an abutment step 8a2, and a part is fixed in the mounting groove 2c by a fastener. The stopper 10 located in the larger part of the through hole 2 b can abut against the stopper 10 when the core rod 8 moves under the action of the pressing spring 9 .

The ejection mechanism is provided with a through hole 2b on the top block 2, and a core rod 8 is arranged in the through hole 2b, and the head 8a of the core rod 8 is against the side wall of the movable mold 1 where the top block 2 is embedded. , the rod portion 8b of the core rod 8 extends out of the through hole 2b and is located at the gap 2a of the top block 2, so that when the molten plastic is injected into the mold, the rod portion 8b of the core rod 8 can extend out of the top block 2 The part at the notch 2a exists so that the part of the molded product that is undercut at the notch 2a can directly have a hole. Moreover, the through hole 2b is also provided with a pressing spring 9 acting on the core rod 8 in the direction away from the notch 2a, and the side wall of the movable mold 1 abutting against the end of the core rod 8 in the position where the top block 2 is embedded is inclined. During the period during which the top plate 3 drives the ejector rod 2 5 to move upward until the abutting portion 5a abuts against the movable mold 1 (that is, a section of the ejection process of the product), a supply core is formed between the top block 2 and the side wall. The gap where the rod 8 moves away from the notch 2a, the gap will become larger and larger as the push rod 2 5 continues to move up, so that the core rod 8 can move up with the top block 2 while pressing Under the action of the spring 9, it continuously moves away from the notch 2a to automatically complete the detachment from the part of the product undercut at the notch 2a of the top block 2. It is separated from the product, so that the product can still be successfully separated from the top block 2 when the product is pushed out in the second stage. Through the above setting, the product with holes on the undercut part can be directly produced by the mold while ensuring that the product can be ejected normally, and there is no need to process the holes after the product is injection molded, thereby improving the production efficiency of the product.

After the product is taken out, the hydraulic cylinder drives the top plate 3 to move downward and reset, and the ejector rod one 4 and the ejector rod two 5 (specifically, the top plate 3 presses on the annular shoulder 6b through the annular shoulder 5b on the positioning seat 6 and presses against the ejector rod two 5 to form a downward thrust) also moves downward together with the top plate 3 and resets, and the top block 2 is re-embedded into the slot 1a at the top of the movable mold 1. During this process, the core rod 8 passes along the guide surface 8a1 at the head 8a The movement of the notch edge of the groove 1a makes the core rod 8 gradually compress the pressing spring 9, so that the rod part 8b of the core rod 8 can extend to the gap 2a of the top block 2 again to ensure that the product can also be buckled in the next injection molding. The required holes are directly molded on the part of the top block 2 .

The specific embodiments described herein are merely illustrative of the spirit of the invention. Those skilled in the art to which the present invention belongs can make various modifications or supplements to the described specific embodiments or adopt similar methods to replace them, but they will not deviate from the spirit of the present invention or go beyond the definition of the appended claims range.

Claims (7)

1. The ejection mechanism of the mold, including the top plate (3) located under the movable mold (1) and the ejector pin one (4) and the ejector pin two (5) which are both pierced in the movable mold (1). The lower end of ejector rod one (4) is fixed to the top plate (3), the upper end of ejector rod two (5) is fixed to the top block (2) embedded in the top of the movable mold (1) and has a gap (2a) on one side, and its lower end There is a linkage structure between the top plate (3) that enables the top plate (3) to drive the second ejector rod (5) to move upwards synchronously, and the outer side of the second ejector rod (5) has a structure that can abut against the movable mold (1) so that the top plate (3) ) and the abutting part (5a) that releases linkage with the ejector rod two (5), it is characterized in that, the described ejector block (2) is provided with a through hole (2b), and a core rod ( 8) With the pressure spring (9), one end of the core rod (8) protrudes out of the through hole (2b) and is located at the gap (2a) of the top block (2) and the pressure spring (9) moves away from the gap (2a) The direction acts on the core rod (8), the side wall of the movable mold (1) in the position where the top block (2) is embedded is inclined, and the other end of the core rod (8) is against the side wall, and the top plate (3 ) drives the push rod two (5) to move upwards, forming a gap between the top block (2) and the side wall for the core rod (8) to move away from the notch (2a). 2. The ejection mechanism of the mold according to claim 1, characterized in that, the through hole (2b) is a stepped hole, and the core rod (8) has a head located in a larger part of the through hole (2b) part (8a) and the rod part (8b) passing through the smaller part of the through hole (2b), the pressure spring (9) is sleeved on the rod part (8b) in the larger part of the through hole (2b) and its two ends respectively lean against the head (8a) and the stepped surface in the through hole (2b). 3. The ejection mechanism of the mold according to claim 2, characterized in that, the movable mold (1) has a slot (1a) running through its top, and the top block (2) is located in the slot (1a) Inside, there is a guide surface (8a1) on the outside of the head (8a). When the top plate (3) resets and moves down, the guide surface (8a1) can move along the notch edge of the socket (1a) and compress the pressure spring (9). 4. The ejection mechanism of the mold according to claim 3, characterized in that, the side of the top block (2) is provided with a mounting groove (2c) communicating with the larger part of the through hole (2b), The outside of the head (8a) of the core rod (8) has an abutment step (8a2), and the part fixed in the installation groove (2c) is located in the larger part of the through hole (2b) and can abut against the abutment step (8a2). Rely on the stopper (10). 5. The ejection mechanism of the mold according to claim 1 or 2 or 3 or 4, characterized in that, the positioning seat (6) with the installation cavity (6a) is fixed on the described top plate (3), and the ejector rod The lower end of the second (5) is located in the installation cavity (6a), and the linkage structure includes the support spring (7) located in the installation cavity (6a), the annular shoulder (5b) and the protruding On the annular shoulder (6b) on the inner wall of the installation cavity (6a), the push rod 2 (5) passes through the center of the annular shoulder (6b), and the two ends of the support spring (7) respectively abut against the installation cavity (6a) The bottom wall of the bottom wall and the lower end of the push rod two (5) and the upper side wall of the annular shoulder (5b) and the lower side wall of the annular shoulder (6b) are abutted against. 6. The ejection mechanism of the mold according to claim 5, characterized in that, the positioning seat (6) includes a lower seat body (6c) fixedly connected to the top plate (3) by fasteners and a threaded connection On the upper base (6d) on the lower base (6c), the installation cavity (6a) is formed by connecting the lower base (6c) with the upper base (6d), and the annular shoulder (6b) is located on the upper base (6d) . 7. The ejection mechanism of the mold according to claim 6, characterized in that, the second ejector rod (5) comprises a main rod body (5c) and an auxiliary rod body (5d), and the lower end of the auxiliary rod body (5d) is positioned at In the seat (6), the upper end of the auxiliary rod body (5d) has a connecting hole, the lower end of the main rod body (5c) is inserted into the connecting hole and the main rod body (5c) and the auxiliary rod body (5d) pass through the rod part (8b) from the bottom Pass through the secondary rod body (5d) and be screwed to the connecting screw (12) in the lower end of the main rod body (5c) to fix it, the lower seat body (6c) is fixed on the bottom of the top plate (3), and the lower seat body (6c) The bottom is provided with an operation hole (6c1) communicating with the installation cavity (6a).

Images