Ejection mechanism of a mold

Abstract

The application provides an ejection mechanism of a mold and belongs to the technical field of injection molds. The problem of low production efficiency is solved. The ejection mechanism comprises a top plate located below a movable mold and two top rods arranged in the movable mold, the lower end of the first top rod is fixed to the top plate, the upper end of the second top rod is fixed to a top block embedded in the top of the movable mold, a linkage structure is arranged between the lower end of the second top rod and the top plate, the linkage structure enables the top plate to drive the second top rod to move upward synchronously, the outer side of the second top rod is provided with an abutting part which can abut against the movable mold to disconnect the linkage between the top plate and the second top rod, a through hole is arranged on the top block, a core rod and a pressing spring are arranged in the through hole, one end of the core rod is located at a gap of the top block, the pressing spring acts on the core rod in a direction away from the gap, and the side wall of the movable mold at the embedded position of the top block is arranged in an inclined manner and the other end of the core rod abuts against the side wall. The ejection mechanism has the advantages of improving the production efficiency of products.

Description

Technical Field

[0001] The invention belongs to the technical field of injection molds and relates to an ejection mechanism of a mold. Background Art

[0002] Injection molds are the most common type of molding tool used in the production of thermoplastic products. They consist of a fixed mold and a movable mold positioned below the fixed mold. When the fixed and movable molds are closed, they form a cavity. Molten plastic is injected into the cavity to form a product with the same shape as the cavity. After the product is formed, the movable and fixed molds are separated to complete the mold opening. Generally, the product is attached to the movable mold after the mold is opened. With the popularization of robots, the degree of automation in the injection molding industry is also increasing, resulting in streamlined production with automatic product ejection and automatic part removal by robots.

[0003] Among them, the automatic ejection of the product relies on the arrangement of an ejection mechanism on the mold, specifically on the movable mold side. For products with regular and flat shapes, the structure of the ejection mechanism is relatively simple, generally including a top plate located below the movable mold and driven by a hydraulic cylinder to move upward, and several ejector rods passing through the movable mold and fixed to the top plate at the lower end. The ejector rods are driven upward by the top plate to automatically push the product upward. Furthermore, in order to ensure the stable ejection of the product, an ejector block is embedded on the top of the movable mold (of course, the top surface of the ejector block also constitutes the cavity surface of the cavity together with the top surface of the movable mold), and then some of the ejector rods are fixed to the ejector block. Here, for the sake of convenience, the ejector rod directly acting on the product is called ejector rod one, and the ejector rod fixed to the ejector block is called ejector rod two, that is, the ejector plate moves upward with ejector rod one and ejector rod two at the same time. However, for products that are not too regular in shape and need to have a protrusion formed on the side of the movable mold, a notch needs to be set on one side of the ejector block to cooperate with the side wall of the movable mold where the ejector block is embedded to form a molding groove connected to the mold cavity, so that the molten plastic will be injected into the molding groove at the same time as it is injected into the mold cavity to form the above-mentioned protrusion. Since the molded protrusion is inverted on the ejector block, it is necessary to set the ejection action of the product to a two-stage type, wherein the first stage is still the ejector plate with ejector rod 1 and ejector rod 2 moving upward to eject the product, and the second stage is the ejector plate with ejector rod 1 continuing to move upward relative to ejector rod 2 to separate the part of the product inverted on the ejector block from the ejector block. Its structure can refer to, for example, a secondary ejection mechanism disclosed in patent application number 201410197888.2.

[0004] According to actual needs, it is sometimes required that the above-mentioned protrusions have holes. The most ideal way is to have this hole directly after the product is injection molded. However, since the protrusion itself is relatively small in size and has a special position, it is difficult to achieve core pulling and demolding at the hole by using the traditional inclined top core pulling mechanism for the slider on the movable mold. Therefore, generally after the product is added, the required hole is processed on the protrusion of the product, which results in a relatively low production efficiency. Summary of the Invention

[0005] The purpose of the present invention is to solve the above problems existing in the prior art and propose a mold ejection mechanism to solve the problem of low production efficiency.

[0006] The purpose of the present invention can be achieved through the following technical solutions:

[0007] The ejection mechanism of the mold includes a top plate located below the movable mold and a first ejector rod and a second ejector rod both provided in the movable mold, a lower end of the ejector rod is fixed to the top plate, an upper end of the second ejector rod is fixed to a top block embedded in the top of the movable mold and having a notch on one side, and a linkage structure is provided between its lower end and the top plate, which can enable the top plate to drive the second ejector rod to move upward synchronously, and the outer side of the second ejector rod has a rest portion that can abut against the movable mold to release the linkage between the top plate and the second ejector rod, and is characterized in that a through hole is provided on the ejector block, a core rod and a pressure spring are provided in the through hole, one end of the core rod extends out of the through hole and is located at the notch of the ejector block, and the pressure spring acts on the core rod in a direction away from the notch, a side wall of the movable mold in the position where the ejector block is embedded is inclined and the other end of the core rod abuts against the side wall, and in the process of the top plate driving the second ejector rod to move upward, a gap is formed between the top block and the side wall for the core rod to move in a direction away from the notch.

[0008] The ejection mechanism is achieved by providing a through hole on the ejector block and arranging a core rod in the through hole. One end of the core rod abuts against a side wall of the movable mold in the position where the ejector block is embedded, and the other end extends out of the through hole and is located in the notch of the ejector block. In this way, when the molten plastic is injected into the mold, the part of the molded product that is inverted at the notch can be directly provided with a hole by virtue of the existence of the end of the core rod extending out of the notch of the ejector block. Furthermore, a pressure spring is provided in the through hole to act on the core rod in a direction away from the notch. A side wall of the movable mold that abuts against one end of the core rod in the position where the ejector block is embedded is inclined. During the process in which the ejector plate drives the second ejector pin to move upward until the abutting portion abuts against the movable mold (i.e., the first ejection process of the product), a gap is formed between the ejector block and the side wall for the core rod to move in a direction away from the notch. The gap becomes larger and larger as the second ejector pin continues to move upward, so that the core rod can continue to move in a direction away from the notch under the action of the pressure spring while the ejector block moves upward, thereby automatically completing the separation of the portion of the product that is inverted in the notch of the ejector block. In other words, after the product is ejected once, the core rod has been separated from the product, so that the portion of the product that is inverted in the notch of the ejector block can still be successfully separated from the ejector block during the second ejection process. Through the above arrangement, while ensuring that the product can be ejected normally, the mold can directly produce a product with a hole in the undercut portion, without having to process the hole separately after the product is injection molded, thereby improving the production efficiency of the product.

[0009] In the ejection mechanism of the above-mentioned mold, the through hole is a stepped hole and its smaller part is connected to the notch. The core rod has a head located in the larger part of the through hole and a rod extending out of the smaller part of the through hole. The pressure spring is sleeved outside the rod located in the larger part of the through hole and its two ends respectively rest on the head and the stepped surface in the through hole.

[0010] The core rod is mainly used to make the part of the molded product that is inverted on the ejector block have the required hole position. The top pressure spring is sleeved on the outside of the rod part located in the larger part of the through hole, and its two ends respectively rest on the head of the core rod and the step surface in the through hole, so that the elastic force of the top pressure spring acts on the core rod in the direction of causing the end of the core rod located at the notch of the ejector block to retract 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 ejector block is embedded, the top pressure spring can be used to realize automatic separation of the core rod and the product, so that the mold can use the core rod to directly produce products with holes on the undercut part without affecting the normal ejection of the product, thereby improving the production efficiency of the product.

[0011] In the ejection mechanism of the above-mentioned mold, the movable mold has an embedding groove running through its top, the ejector block is located in the embedding groove, and the outer side of the head has a guide surface. When the ejector plate is reset and moved downward, the guide surface can move along the edge of the groove and compress the top pressure spring.

[0012] During the first stage of product ejection, the ejector block partially extends out of the slot, and the head of the core rod is no longer constrained by the slot walls. Under the action of the pressure spring, it automatically extends out of the larger portion of the through-hole, thereby automatically separating the core rod from the product. As the ejector plate returns and moves downward, the guide surface on the outer side of the core rod's head moves along the edge of the slot, gradually compressing the pressure spring, allowing the core rod to extend from the through-hole into the notch of the ejector block. This ensures that the mold can directly produce products with holes in the undercut portion using the core rod, thereby improving product production efficiency.

[0013] In the ejection mechanism of the above-mentioned mold, the side of the ejector block is provided with a mounting groove connected to the larger part of the through hole, the outer side of the head of the core rod is provided with an abutment step, and a limit block piece is fixed in the mounting groove, which is partially located in the larger part of the through hole and can abut against the abutment step.

[0014] Through the above arrangement, the distance that the core rod moves under the elastic force of the top pressure spring can be limited, thereby preventing the core rod from extending excessively and being unable to be reset using the first or second guide surface when the top plate is reset and moved downward, thereby ensuring the reliability of the mold using the core rod to directly produce products with holes on the undercut part.

[0015] In the ejection mechanism of the above-mentioned mold, a positioning seat with an installation cavity is fixed on the top plate, and the lower end of the second ejector rod is located in the installation cavity. The linkage structure includes a support spring located in the installation cavity, an annular boss provided outside the lower end of the second ejector rod, and an annular shoulder protruding from the inner side wall of the installation cavity. The second ejector rod passes through the center of the annular shoulder, and the two ends of the support spring respectively abut against the bottom wall of the installation cavity and the lower end of the second ejector rod, and make the upper side wall of the annular boss abut against the lower side wall of the annular shoulder.

[0016] The elastic force of the support spring acts upward on the ejector pin 2, so that the upper side wall of the annular boss at the lower end of the ejector pin 2 abuts against the lower side wall of the annular shoulder protruding from the inner wall of the mounting cavity. In this way, when the ejector plate just starts to move upward, the ejector pin 2 can move synchronously with the above-mentioned cooperation, thereby enabling the ejector pin 1 and the ejector pin 2 to move synchronously during the initial movement of the ejector plate to complete the first-stage ejection of the product; when the abutting portion abuts against the movable mold, the upward movement of the ejector pin 2 is blocked, and the ejector plate can continue to move upward relative to the ejector pin 2 through the compression of the support spring, thereby completing the second-stage ejection of the product through further movement of the ejector pin 1 to separate the part of the product inverted at the notch of the ejector block from the ejector block.

[0017] The interaction of the support spring, annular shoulder, and annular boss allows the ejector plate to initially and stably drive ejector pin 2 upward, ensuring reliable product ejection. However, the method of using the friction generated by the plunger's pressure on both sides to drive ejector pin 2 upward is prone to slippage, as the direction of the plunger's force is perpendicular to the direction of ejector pin 2's movement, preventing smooth product ejection.

[0018] 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 threadedly connected to the lower seat body. The installation cavity is formed by connecting the lower seat body and the upper seat body, and the annular shoulder is located on the upper seat body.

[0019] During assembly, the support spring is placed on the lower seat, and then the second push rod is passed through the upper seat from bottom to top. The upper seat is then threaded onto the lower seat to form a positioning seat. The installation cavity formed between the upper and lower seats allows the elastic force of the support spring to act upward on the second push rod. Finally, the positioning seat is fixed to the top plate with fasteners. This makes the second push rod, support spring, and positioning seat form an independent component, which facilitates subsequent maintenance.

[0020] In the ejection mechanism of the above-mentioned mold, the second ejector rod includes a main rod body and a sub-rod body. The lower end of the sub-rod body is located in the positioning seat, and the upper end of the sub-rod body has a connecting hole. The lower end of the main rod body is inserted into the connecting hole and the main rod body and the sub-rod body are fixed by connecting screws that pass through the sub-rod body from bottom to top and are threadedly connected to the lower end of the main rod body. The lower seat body is fixed to the bottom of the top plate, and the bottom of the lower seat body is provided with an operating hole connected to the mounting cavity.

[0021] By configuring the ejector rod to include a main rod body and a secondary rod body, and by securing the two via a connecting screw that passes through the secondary rod body from bottom to top and is threaded into the lower end of the main rod body, the secondary rod body and the main rod body are detachably connected. Simultaneously, the lower base body is secured to the bottom of the top plate, and an operating hole communicating with the mounting cavity is provided at the bottom of the lower base body. This allows a worker to directly insert a screwdriver through the operating hole into the mounting cavity to remove the connecting screw, thereby enabling the worker to dismantle the entire ejection mechanism, excluding the main rod body, without disturbing the ejector block, further improving the convenience of subsequent maintenance.

[0022] Compared to the prior art, the ejection mechanism of this mold is achieved by providing a through hole in the ejector block, within which a core rod is disposed. One end of the core rod rests against the side wall of the movable mold where the ejector block is embedded, while the other end of the core rod extends out of the through hole and is located in the notch of the ejector block. When the molten plastic is injected into the mold, the portion of the molded product that is inverted in the notch can be directly provided with a hole by virtue of the end of the core rod extending out of the notch of the ejector block, thereby improving production efficiency. Furthermore, a pressure spring is provided in the through hole, acting on the core rod in a direction away from the notch, and a side wall of the movable mold where the ejector block is embedded is tilted. During a product ejection process, as the gap between the ejector block and the side wall of the movable mold increases, the core rod can utilize the elastic force of the pressure spring to continuously move away from the notch, thereby automatically separating the core rod from the product, thereby ensuring that the arrangement of the core rod does not affect the normal ejection of the product. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a cross-sectional view of the ejection mechanism of this mold.

[0024] Figure 2 yes Figure 1 An enlarged cross-sectional view of the linkage structure between the second lower end of the middle push rod and the top plate.

[0025] Figure 3 yes Figure 2 Enlarged cross-sectional view of the middle top block.

[0026] Figure 4 It is a side view of the top block side where the larger part of the through hole is located.

[0027] Figure 5 yes Figure 4 Schematic cross-sectional view along the AA direction.

[0028] Figure 6 This is a cross-sectional view of the ejection mechanism of the mold after completing a section of ejection.

[0029] Figure 7 yes Figure 6 Enlarged cross-sectional view of the middle top block.

[0030] Figure 8 This is a cross-sectional view of the ejection mechanism of this mold after completing the second-stage ejection.

[0031] In the figure, 1, movable mold; 1a, embedding groove; 2, top block; 2a, notch; 2b, through hole 2c, mounting groove; 3, top plate; 3a, clearance hole 1; 4, top rod 1; 5, top rod 2; 5a, abutment part; 5b, annular boss; 5c, main rod body; 5d, auxiliary rod body; 6, positioning seat; 6a, mounting cavity; 6b, annular shoulder; 6c, lower seat body; 6c1, operating hole; 6d, upper seat body; 7, supporting spring; 8, core rod; 8a, head; 8a1, guide surface; 8a2, abutment step; 8b, rod; 9, pressure spring; 10, limit block; 11, base; 11a, connecting column; 11b, seat plate; 11b1, clearance hole 2; 12, connecting screw. DETAILED DESCRIPTION

[0032] The following are specific embodiments of the present invention and the accompanying drawings to further describe the technical solutions of the present invention, but the present invention is not limited to these embodiments.

[0033] like Figure 1 、 Figure 2 and Figure 3 As shown, the ejection mechanism of the mold includes a top plate 3 located below the movable mold 1 and capable of moving upward, and a top rod 4 and a top rod 5 both of which are inserted into the movable mold 1 (in practice, there are several top rods 4, but only one is shown in this embodiment). A base 11 is fixed below the movable mold 1, and the top plate 3 is arranged on the inner side of the base 11. A hydraulic cylinder (not shown in the figure) is connected to the bottom of the base 11. The top plate 3 is fixedly connected to the upper end of the piston rod of the hydraulic cylinder. Therefore, when the piston rod of the hydraulic cylinder is pushed upward, the top plate 3 can be driven to move upward, or when the piston rod of the hydraulic cylinder is retracted downward and reset, the top plate 3 can be pulled to move downward and reset. The movable mold 1 is provided with a positioning hole 1 and a positioning hole 2 extending through both ends. The upper end of the positioning hole 1 extends through the top of the movable mold 1. A push rod 1 4 is provided within the positioning hole 1 and its lower end is fixed to the top plate 3. The upper end of the positioning hole 2 communicates with the portion of the movable mold 1 where the top block 2 is embedded. A push rod 2 5 is provided within the positioning hole 2 and its upper end is fixed to the top block 2 embedded in the top of the movable mold 1 and having a notch 2a on one side. In practice, the movable mold 1 has a groove 1a extending through its top, the top block 2 is located within the groove 1a, and the upper end of the positioning hole 2 communicates with the groove 1a. A linkage structure is provided between the lower end of the push rod 2 5 and the top plate 3 to enable the two to move upward synchronously. The outer side of the push rod 2 5 has a contact portion 5a that can abut against the movable mold 1 to decouple the top plate 3 from the push rod 2 5.

[0034] In this embodiment, if Figure 1 and Figure 2As shown, a positioning seat 6 with a mounting cavity 6a is fixed on the top plate 3, and the lower end of the top rod 2 5 is located in the mounting cavity 6a. The linkage structure includes a support spring 7 located in the mounting cavity 6a, an annular boss 5b provided outside the lower end of the top rod 2 5, and an annular shoulder 6b protruding from the inner wall of the mounting cavity 6a. The top 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 bottom wall of the mounting cavity 6a and the lower end of the top rod 2 5 and make the upper side wall of the annular boss 5b abut against the lower side wall of the annular shoulder 6b. The elastic force of the support spring 7 acts upward on the ejector pin 2 5, so that the upper side wall of the annular boss 5b at the lower end of the ejector pin 2 5 abuts against the lower side wall of the annular shoulder 6b protruding from the inner wall of the mounting cavity 6a. In this way, when the ejector plate 3 just starts to move upward, the ejector pin 2 5 can move synchronously with the above-mentioned cooperation, that is, form a linkage. As a result, when the ejector plate 3 initially moves, it can drive the ejector pins 1 4 and 2 5 to move synchronously to complete a section of the ejection of the product. The state after completing a section of the ejection is as follows: Figure 6 and Figure 7 As shown; when the abutment portion 5a abuts against the movable mold 1, the upward movement of the ejector pin 2 5 is blocked, and the compression of the support spring 7 allows the ejector plate 3 to continue to move upward relative to the ejector pin 2 5, that is, the linkage between the ejector plate 3 and the ejector pin 2 5 is released, thereby completing the second stage ejection of the product by further moving the ejector pin 1 4 so that the part of the product that is inverted at the notch 2a of the ejector block 2 is separated from the ejector block 2. The state after completing the second stage ejection is shown in FIG. Figure 8 As shown. The positioning seat 6 includes a lower seat body 6c fixedly connected to the top plate 3 by fasteners and an upper seat body 6d threadedly connected to the lower seat body 6c. The installation cavity 6a is formed by connecting the lower seat body 6c and the upper seat body 6d. The annular shoulder 6b is located on the upper seat body 6d. The top rod 5 includes a main rod body 5c and a secondary rod body 5b. The lower end of the secondary rod body 5b is located in the positioning seat 6. The upper end of the secondary rod body 5b has a connecting hole. The lower end of the main rod body 5c is inserted into the connecting hole. The main rod body 5c and the secondary rod body 5d are fixed by a 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. The abutment portion 5a is the upper end of the secondary rod body 5b. The outer diameter of the secondary rod body 5b is larger than the aperture of the positioning hole 2. In this embodiment, top plate 3 is provided with a clearance hole 3a. Lower base 6c is fixedly connected to the bottom of top plate 3, with upper base 6d positioned within clearance hole 3a. Lower base 6c has an operating hole 6c1 at its bottom, communicating with mounting cavity 6a. Base 11 comprises a connecting post 11a fixedly connected to the bottom of movable mold 1 and a base plate 11b secured to connecting post 11a via fasteners. Base plate 11b has a clearance hole 11b1 defined in it, with the bottom of lower base 6c positioned within clearance hole 11b1.

[0035] Furthermore, if Figure 1 、 Figure 2 、 Figure 4 and Figure 5As shown, the ejector block 2 is provided with a through hole 2b, within which a core rod 8 and a pressure spring 9 are located. One end of the core rod 8 extends through the through hole 2b and is located within the notch 2a of the ejector block 2. The pressure spring 9 acts on the core rod 8 in a direction away from the notch 2a. A side wall of the movable mold 1 within which the ejector block 2 is embedded is inclined, i.e., a side wall of the embedding groove 1a is inclined. The other end of the core rod 8 abuts against this side wall, and a gap is formed between this side wall and the ejector block 2 during the synchronous upward movement of the ejector rod 5 driven by the ejector plate 3, allowing the core rod 8 to move away from the notch 2a. Specifically, the through hole 2b is a stepped hole, with the smaller portion of the through hole 2b communicating with the notch 2a on the side of the ejector block 2. The core rod 8 has a head 8a located within the larger portion of the through hole 2b and a rod 8b extending outside the smaller portion of the through hole 2b. The pressure spring 9 is sleeved outside the rod 8b located within the larger portion of the through hole 2b, with its ends abutting against the head 8a and the stepped surface within the through hole 2b, respectively. The head 8a has a guide surface 8a1 on its outer side. When the top plate 3 returns to its original position and moves downward, the guide surface 8a1 can move along the edge of the slot 1a and compress the pressure spring 9. Furthermore, a mounting groove 2c is provided on the side of the top block 2, communicating with the larger portion of the through hole 2b. The head 8a of the core rod 8 has an abutment step 8a2 on its outer side. A stopper 10, partially located within the larger portion of the through hole 2b, is secured within the mounting groove 2c via fasteners. When the core rod 8 moves under the action of the pressure spring 9, the abutment step 8a2 can abut against the stopper 10.

[0036] The ejection mechanism is achieved by providing a through hole 2b on the ejector block 2 and arranging a core rod 8 in the through hole 2b. The head 8a of the core rod 8 abuts against the side wall of the movable mold 1 where the ejector block 2 is embedded, and the rod portion 8b of the core rod 8 extends out of the through hole 2b and is located at the notch 2a of the ejector block 2. In this way, when the molten plastic is injected into the mold, the portion of the molded product that is inverted at the notch 2a can be directly provided with a hole by virtue of the presence of the rod portion 8b of the core rod 8 extending out of the notch 2a of the ejector block 2. When the ejector 2 is in the second stage, the rod 8b of the core rod 8 is separated from the product by the action of the spring 9 and the spring 9 moves upward, so that the product can be ejected in the second stage. Through the above arrangement, while ensuring that the product can be ejected normally, the mold can directly produce products with holes on the undercut part, without the need to process the holes after the product is injection molded, thereby improving the production efficiency of the product.

[0037] After the product is taken out, the hydraulic cylinder drives the top plate 3 to move downward and reset, and the top rod 1 4 and the top rod 2 5 (specifically, the top plate 3 is pressed on the annular shoulder 6b through the annular boss 5b on the positioning seat 6 to form a downward thrust on the top rod 2 5) also move downward and reset together with the top plate 3, and the top block 2 is re-embedded in the embedding groove 1a at the top of the movable mold 1. During this process, the core rod 8 moves along the edge of the groove 1a through the guide surface 8a1 at the head 8a, so that the core rod 8 gradually compresses the top pressure spring 9, so that the rod part 8b of the core rod 8 can be extended to the notch 2a of the top block 2 again to ensure that the required hole can be directly formed on the part of the product upside down on the top block 2 during the next injection molding.

[0038] The specific embodiments described herein are merely illustrative of the spirit of the present invention. Persons skilled in the art may make various modifications, additions, or substitutions to the described specific embodiments without departing from the spirit of the present invention or exceeding the scope of the appended claims.

Claims

1. The ejection mechanism of the mold comprises a top plate (3) located below the movable mold (1) and a top rod (4) and a second top rod (5) both of which are inserted into the movable mold (1), wherein the lower end of the top rod (4) is fixed to the top plate (3), the upper end of the second top rod (5) is fixed to a top block (2) embedded in the top of the movable mold (1) and having a notch (2a) on one side, and a linkage structure is provided between the lower end and the top plate (3) so that the top plate (3) drives the second top rod (5) to move upward synchronously, and the outer side of the second top rod (5) has a supporting portion (5a) that can abut against the movable mold (1) to release the linkage between the top plate (3) and the second top rod (5), characterized in that: The top block (2) is provided with a through hole (2b), and a core rod (8) and a pressure spring (9) are provided in the through hole (2b). One end of the core rod (8) extends out of the through hole (2b) and is located at the notch (2a) of the top block (2), and the pressure spring (9) acts on the core rod (8) in a direction away from the notch (2a). One 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. In the process of the top plate (3) driving the top rod (5) to move upward, a gap is formed between the top block (2) and the side wall for the core rod (8) to move in a direction away from the notch (2a). The through hole (2b) is a stepped hole, and the core rod (8) has a head (8a) located in the larger part of the through hole (2b) and a rod (8b) extending out of the smaller part of the through hole (2b), a top pressure spring (9) is sleeved on the outside of the rod (8b) located in the larger part of the through hole (2b) and its two ends respectively abut against the step surfaces in the head (8a) and the through hole (2b), a movable mold (1) has a groove (1a) passing through the top thereof, a top block (2) is located in the groove (1a), and a guide surface (8a1) is provided on the outside of the head (8a), and when the top plate (3) is reset and moved downward, the guide surface (8a1) can move along the edge of the groove (1a) and compress the top pressure spring (9).

2. The ejection mechanism of the mold according to claim 1, characterized in that: The side of the top block (2) is provided with a mounting groove (2c) connected to the larger part of the through hole (2b), the outer side of the head (8a) of the core rod (8) is provided with abutment step (8a2), ​​and a limiting block (10) is fixed in the mounting groove (2c), which is partially located in the larger part of the through hole (2b) and can abut against the abutment step (8a2).

3. The ejection mechanism of the mold according to claim 1 or 2, characterized in that: A positioning seat (6) having a mounting cavity (6a) is fixed on the top plate (3), the lower end of the second top rod (5) is located in the mounting cavity (6a), and the linkage structure includes a support spring (7) located in the mounting cavity (6a), an annular boss (5b) provided outside the lower end of the second top rod (5), and an annular shoulder (6b) protruding from the inner wall of the mounting cavity (6a), the second top rod (5) passes through the center of the annular shoulder (6b), and the two ends of the support spring (7) respectively abut against the bottom wall of the mounting cavity (6a) and the lower end of the second top rod (5) and make the upper side wall of the annular boss (5b) abut against the lower side wall of the annular shoulder (6b).

4. The ejection mechanism of the mold according to claim 3, characterized in that: The positioning seat (6) includes a lower seat body (6c) fixedly connected to the top plate (3) by fasteners and an upper seat body (6d) threadedly connected to the lower seat body (6c). The installation cavity (6a) is formed by connecting the lower seat body (6c) and the upper seat body (6d), and the annular shoulder (6b) is located on the upper seat body (6d).

5. The ejection mechanism of the mold according to claim 4, characterized in that: The second top rod (5) includes a main rod body (5c) and a sub-rod body (5d), the lower end of the sub-rod body (5d) is located in the positioning seat (6), the upper end of the sub-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 sub-rod body (5d) are fixed to each other through a connecting screw (12) that passes through the sub-rod body (5d) from bottom to top and is threadedly connected to the lower end of the main rod body (5c), the lower seat (6c) is fixed to the bottom of the top plate (3), and the bottom of the lower seat (6c) is provided with an operating hole (6c1) connected to the installation cavity (6a).

Images