A mold suitable for single cavity delayed ejection

Abstract

This invention discloses a mold suitable for single-cavity delayed ejection, relating to the field of mold technology. It includes a moving mold frame, several sliders, and a corresponding number of eccentric sliding mechanisms. The sliders are circumferentially positioned at the top of the core mold, and are used in conjunction with the core mold and fixed mold to form the product material through injection molding. The sliders are located at the moving mold frame, which has circumferentially arranged slideways matching the number of sliders. This invention, by superimposing direct ejector pins and delayed ejector pins, combined with the strong ejection of the moving mold frame, achieves complete forced ejection logic within the limited internal space of a single-cavity mold, meeting the single-cavity production needs of small plastic components. Simultaneously, when the delayed ejector pin contacts the direct ejector pin, the moving mold frame also contacts the bottom of the product material. At this point, the sliders have already yielded, and the sprue and product material are ejected synchronously, avoiding the problem of sprue breaking before the product in traditional solutions, causing product defects.

Description

Technical Field

[0001] This invention relates to the field of mold technology, specifically to a mold suitable for single-cavity delayed ejection. Background Technology

[0002] Currently, a plastic component for a controller is being manufactured, such as... Figure 1 As shown, the plastic component has barbs on the inside, making it difficult to demold after molding. Since the barbs are embedded in the core mold after molding, traditional ejector pin demolding can easily cause irregular breakage of the sprue material and make it difficult to peel the product. Therefore, we considered using the mold itself for strong demolding. However, even with strong demolding, the problem of irregular breakage of the sprue material still exists. Therefore, we considered ejecting the sprue material and the product material simultaneously to achieve demolding. This still requires delayed demolding. At the same time, since the plastic component is relatively small and the current demand is low, cost issues need to be considered during production. After consideration, we chose to use a single-cavity mold for production. The mold is small and suitable for small-batch production. However, since the ejector pin hole is located in the middle of the base plate, it is not suitable for single-cavity molds. If a traditional delayed ejection structure is used, that is, a multi-cavity mold size is used, but only a single cavity is produced, the mold shape will be large, the footprint will be large, the structure will not be compact, and waste will occur. Therefore, in view of this situation, this invention proposes a new solution. Summary of the Invention

[0003] The purpose of this invention is to provide a mold suitable for single-cavity delayed ejection, so as to solve the problems mentioned in the background art.

[0004] To achieve the above objectives, the present invention provides the following technical solution: a mold suitable for single-cavity delayed ejection, comprising a fixed mold, a moving mold, a bottom mold, a direct ejector pin, and a core mold, wherein the fixed mold and the moving mold cooperate to form a flow channel and directly abut against the top of the direct ejector pin, characterized in that: The moving mold includes a moving mold skeleton, several sliders, and a number of eccentric sliding mechanisms corresponding to the sliders. Several sliders are circumferentially arranged at the top position of the core mold. The sliders cooperate with the core mold and the fixed mold to form the product material through injection molding. Several sliders are attached to the surface of the product material, and the sliders divide the surface of the product material into several equal parts. Two sliders are attached to the surface of the sprue material, and the two sliders are attached to each other at the midpoint of the sprue material. During demolding, the product material is forcefully ejected by the moving mold skeleton, while at the same time, the sprue material is ejected synchronously by the direct ejector pins along with the product material.

[0005] Further regarding this solution, the movable mold further includes a first movable mold base frame and a second movable mold base frame, the second movable mold base frame is located on the top of the first movable mold base frame, the sliding blocks are arranged at the movable mold skeleton, the movable mold skeleton is circumferentially provided with slide rails the number of which is consistent with that of the sliding blocks, a delay ejector pin is arranged directly below the direct ejector pin, a gap H2 is provided between the delay ejector pin and the direct ejector pin, a gap H1 is provided between the bottom of the slide rail of the movable mold skeleton and the bottom end of the product, and H1=H2.

[0006] Further regarding this solution, the bottom of the direct ejector pin is located at the first movable mold base frame, an ejector pin plate is arranged at the bottom mold, the delay ejector pin is fixed at the position of the ejector pin plate, and the delay ejector pin and the direct ejector pin are arranged coaxially.

[0007] Further regarding this solution, the bottom end of the core mold is fixed in the first movable mold base frame and extends vertically upward to the injection molding position of the sliding block, a plurality of ejector rods are installed at the ejector pin plate, the second movable mold base frame is provided with limiting shafts in corresponding numbers at positions corresponding to the ejector rods, the limiting shafts are fixed at the top ends of the ejector rods, the ejector rods penetrate through the first movable mold base frame and the first movable mold base frame slides relative to the ejector rods, the telescopic spring is located between the first movable mold base frame and the ejector pin plate, a fixed rod is further installed on the ejector pin plate, the top end of the fixed rod is fixed to the first movable mold base frame, and the bottom of the mold is further provided with a fixed cylinder.

[0008] Further regarding this solution, the first movable mold base frame is further provided with a sliding sleeve at a position coaxial with the direct ejector pin, a return spring is arranged in the sliding sleeve, the direct ejector pin is sleeved in the return spring, and the top end of the direct ejector pin is a convex-shaped end head.

[0009] Further regarding this solution, a position block is installed on the first movable mold base frame at the position corresponding to the delay ejector pin, the position block is provided with a hole penetrating through both ends, and the delay ejector pin passes through the hole to be in contact with the direct ejector pin.

[0010] Further regarding this solution, the core mold is an independent workpiece in the shape of a rod body, and after the movable mold and the fixed mold are closed, an injection cavity is formed at the top end position of the core mold.

[0011] Further regarding this solution, the number of the slide rails and the sliding blocks is three, the intersection of the midlines of the three slide rails corresponds to the position of the product material, the edges where the three sliding blocks are attached divide the product material into three equal parts, and the edge where two adjacent sliding blocks are attached divides the nozzle material into two equal parts.

[0012] Further regarding this solution, the flow passage formed by the cooperation of the fixed mold and the movable mold is located on one side of the injection cavity, in the initial state, injection holes are formed between the sliding blocks, the injection holes and the injection holes on the fixed mold are coaxial to form the flow passage, and the flow passage is communicated with the injection cavity to realize the injection molding of the product material.

[0013] Further, when the mold is demolded, the moving mold and the bottom mold move downwards synchronously. Each eccentric sliding mechanism synchronously controls the corresponding slider to slide centrifugally along the slide to make room at the top of the product material. Then, the delayed ejector pin moves toward the direct ejector pin, while the moving mold skeleton moves toward the product material. When the delayed ejector pin contacts the direct ejector pin, the bottom of the slide of the moving mold skeleton contacts the product material. The moving mold skeleton and the delayed ejector pin continue to perform ejection actions synchronously, and the moving mold skeleton forcefully ejects the product material, while the sprue is ejected by the direct ejector pin.

[0014] Compared with the prior art, the beneficial effects of the present invention are: This mold suitable for single-cavity delayed ejection achieves complete forced ejection logic within the limited internal space of a single-cavity mold by stacking direct ejector pins and delayed ejector pins, combined with the strong ejection of the moving mold skeleton. This meets the single-cavity production needs of small plastic components. At the same time, when the delayed ejector pin just contacts the direct ejector pin, the moving mold skeleton also just contacts the bottom of the product material. At this time, the slider has completed its clearance, and the sprue material and the product material are ejected synchronously, avoiding the problem of the sprue material breaking before the product and causing product defects in traditional solutions.

[0015] Meanwhile, the present invention employs three sliders circumferentially positioned on the top of the core mold, and drives the sliders to centrifugally move by an eccentric sliding mechanism. The edges of two adjacent sliders that are in contact with each other precisely divide the sprue material into two equal parts. This geometric layout ensures that the sliders do not collide or interfere with the sprue material or the product during the moving process, thus guaranteeing the smoothness and reliability of demolding while maintaining a compact structure. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the material structure of the product of the present invention; Figure 2 This is a schematic diagram of the overall structure of the present invention; Figure 3 This is a cross-sectional structural diagram of the present invention; Figure 4 This is a schematic diagram of the moving mold skeleton and slider of the present invention; Figure 5 This is a schematic diagram of the H1 position structure of the present invention; Figure 6 This is a schematic diagram of the cross-sectional structure of the mold of the present invention; Figure 7 This is a schematic diagram of the slider position structure of the present invention; Figure 8 This is a schematic diagram of an embodiment of the slider position of the present invention; Figure 9 This is another cross-sectional structural diagram of the present invention.

[0017] In the diagram: 1. Fixed mold; 2. Moving mold; 201. Inclined guide post; 202. Traction block; 203. Moving mold base frame one; 204. Moving mold skeleton; 205. Slider; 206. Moving mold base frame two; 3. Bottom mold; 4. Product material; 5. Core mold; 6. Direct ejector pin; 601. Sliding sleeve; 602. Return spring; 7. Ejector plate; 8. Delayed ejector pin; 9. Position block; 10. Sprue material; 11. Telescopic spring; 12. Ejector rod; 13. Limiting shaft; 14. Fixed rod; 15. Fixed cylinder. Detailed Implementation

[0018] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0019] This invention provides a technical solution: a mold suitable for single-cavity delayed ejection, comprising a fixed mold 1, a moving mold 2, and a bottom mold 3, as shown below. Figure 1 As shown, this mold is used to produce a small product material 4 on the controller. Each mold has only one cavity for injection molding the material, such as... Figure 2 and Figure 3 As shown, specifically, in this embodiment, the core mold 5 is set at the moving mold 2, and the core mold 5 is a single workpiece in the shape of a rod. After the moving mold 2 and the fixed mold 1 are closed, a cavity is formed at the top of the core mold 5, that is, the injection cavity. The product material 4 is formed by injection molding, and the sprue material 10 and the product material 4 are demolded by the moving mold 2 and the direct ejector pin 6.

[0020] like Figure 3 , Figure 4 and Figure 5 As shown, to ensure the smooth implementation of the above embodiments, in this embodiment, the fixed mold 1, the moving mold 2, and the bottom mold 3 are designed sequentially from top to bottom. The fixed mold 1 and the moving mold 2 cooperate to form a flow channel and are directly against the top of the direct ejector pin 6. The top of the direct ejector pin 6 has a diameter slightly smaller than the diameter of the flow channel. During injection molding, the end of the direct ejector pin 6 extends into the material handle of the sprue 10, which can prevent the material handle from moving with the slider 205 and reduce the occurrence of material jamming and breakage. The moving mold 2 also includes a moving mold skeleton 204, a number of sliders 205, and a number of eccentric sliding mechanisms corresponding to the sliders 205. The number of sliders 205 are circumferentially arranged at the top position of the core mold 5. The sliders 205 form the product by cooperating with the core mold 5 and the fixed mold 1. The slider 205 is located at the moving mold skeleton 204, and the moving mold skeleton 204 has a number of slides in the circumferential direction that are the same as the number of sliders 205. A delayed ejector pin 8 is provided directly below the direct ejector pin 6. A gap H2 is provided between the delayed ejector pin 8 and the direct ejector pin 6. A gap H1 is provided between the bottom of the slide of the moving mold skeleton 204 and the bottom of the product material 4. H1=H2.

[0021] like Figure 6 As shown, during demolding, the moving mold 2 and the bottom mold 3 move downwards synchronously. Each eccentric sliding mechanism synchronously controls the corresponding slider 205 to slide centrifugally along the slide to make room at the top of the product material 4. Then, the delayed ejector pin 8 moves closer to the direct ejector pin 6. At the same time, the moving mold skeleton 204 moves towards the product material 4. When the delayed ejector pin 8 contacts the direct ejector pin 6, the bottom of the slide of the moving mold skeleton 204 contacts the product material 4. The moving mold skeleton 204 and the delayed ejector pin 8 continue to perform the ejection action synchronously. The moving mold skeleton 204 forcefully ejects the product material 4, and the sprue 10 is ejected by the direct ejector pin 6.

[0022] Looking back Figure 3 and Figure 4 Specifically, the moving mold 2 includes a first moving mold base 203 and a second moving mold base 206. The second moving mold base 206 is located on top of the first moving mold base 203 and can move independently in the vertical direction. The moving mold skeleton 204 is fixedly installed on the top of the second moving mold base 206. The eccentric sliding mechanism includes traction blocks 202 slidably installed at each slide of the moving mold skeleton 204. In the initial state, the traction blocks 202 abut against the slider 205, and the slider 205 is circumferentially and tightly attached to the surface of the product material 4. In the initial state, the fixed mold 1 faces the moving mold 2, and an inclined guide post 201 is provided at each position of the traction block 202. The inclined guide post 201 is used to control the movement of the traction block 202 along the slide. Specifically, the inclined guide post 201 is inclined from top to bottom in a direction away from the core mold 5, and is through-cut at the traction block 202. There is a through hole with the same inclination angle as the inclined guide post 201. The inclined guide post 201 is fitted into the through hole. In this embodiment, the traction block 202 and the slider 205 are fixed together. When the moving mold 2 descends, the position of the inclined guide post 201 in the through hole will change. Specifically, as the moving mold 2 moves downward, the lower end of the inclined guide post 201 will be located at the position of the through hole during the gradual descent. Since the inclined guide post 201 is inclined away from the core mold 5, naturally, the traction block 202 will also move away from the core mold 5 under the action of the inclined guide post 201. The slider 205, the traction block 202 and the inclined guide post 201 are all circumferentially distributed around the core mold 5. In this case, the moving mold 2 descends, making room between the product material 4 and the fixed mold 1. The slider 205 moves, making room around the product material 4, providing conditions for ejecting the product material 4.

[0023] like Figure 7 and Figure 8As shown, it is important to understand that this embodiment is provided with three slides. The intersection of the midpoints of the three slides is the position of the product material 4. The edges of the three sliders 205 that are in contact with each other divide the product material 4 into three equal parts. The edges of two adjacent sliders 205 that are in contact with each other divide the sprue material 10 into two equal parts. With the support of this structure, when the three sliders 205 move synchronously along the slides, they can make room for the positions of the sprue material 10 and the product material 4, thus avoiding collision interference. The above embodiment is a preferred embodiment of this technical solution. This embodiment can also be provided with four slides. The intersection of the midpoints of the four slides is the position of the product material 4. The edges of the four sliders 205 that are in contact with each other divide the product material 4 into four equal parts. When the four sliders 205 move synchronously along the slides, they can just make way for the position of the outlet material 10 and the product material 4.

[0024] In other words, several sliders 205 are attached to the surface of the product material 4, and the sliders 205 divide the surface of the product material 4 into several equal parts. Two sliders 205 are attached to the surface of the sprue material 10, and the point where the two sliders 205 are attached is exactly located at the midpoint of the sprue material 10.

[0025] Looking back Figure 3 and Figure 4 To ensure the smooth implementation of the above embodiments, it is also necessary to understand that the flow channel formed by the fixed mold 1 and the moving mold 2 is located on one side of the injection cavity. That is, in the initial state, there is an injection hole between the sliders 205, which is coaxial with the injection hole on the fixed mold 1 to form a flow channel. The flow channel is connected to the injection cavity to realize the injection molding of the product material 4.

[0026] To eject the sprue 10, the bottom of the direct ejector pin 6 is located at position 203 of the moving mold base. After the direct ejector pin 6 moves a certain distance toward the fixed mold 1, the sprue 10 can be ejected. The delayed ejector pin 8 is fixed at the position of the ejector plate 7. The delayed ejector pin 8 is directly below the direct ejector pin 6. The delayed ejector pin 8 pushes the direct ejector pin 6 to eject the sprue 10 along with the product material 4.

[0027] like Figure 3 and Figure 9As shown, the bottom of the core mold 5 is fixed inside the moving mold base 203, and the top is vertically upward to the injection molding point of the slider 205. That is to say, in this embodiment, the position of the core mold 5 changes with the position of the moving mold base 203. Therefore, in order to achieve the demolding action, it is also necessary to know that a number of ejector pins 12 are installed at the ejector plate 7, and a number of corresponding limiting shafts 13 are set at the positions of the ejector pins 12 on the moving mold base 206. The limiting shafts 13 are fixed to the top of the ejector pins 12, and the ejector pins 12 pass through the moving mold base 203. 3. The moving mold base 203 slides with the ejector pin 12. A wide-diameter groove is provided at the bottom of the moving mold base 203, and a telescopic spring 11 is installed in the groove. The telescopic spring 11 is located between the moving mold base 203 and the ejector plate 7. A fixed rod 14 is also installed on the ejector plate 7. The top of the fixed rod 14 is fixed to the moving mold base 203. A fixed cylinder 15 is also provided at the bottom of the entire mold. After the moving mold 2 and the bottom mold 3 descend a certain distance, the ejector plate 7 contacts the fixed cylinder 15. Based on the above structure, the specific demolding action of this mold is as follows: During demolding, the fixed mold 1 remains stationary, while the moving mold 2 descends. After the ejector plate 7 abuts against the fixed cylinder 15, the moving mold base 1 203 continues to descend, and the core mold 5 follows the moving mold base 1 203. The moving mold base 2 206 and the moving mold skeleton 204 stop after contacting the fixed cylinder 15. As the core mold 5 continues to descend, the moving mold base 2 206 and the moving mold skeleton 204 rise relative to the core mold 5, or in other words, the moving mold skeleton 204 gradually approaches the core mold 5. At the same time, the ejector plate 7 also rises relative to the moving mold base 1 203, causing the delayed ejector pin 8 to move towards the direct ejector pin 6. During this process, since H1=H2, when the delayed ejector pin 8 just contacts the direct ejector pin 6, the moving mold skeleton 204 on the moving mold base 2 206 also just contacts the bottom of the product material 4. At this time, due to the descent of the moving mold 2, the slider 205 has opened, making room for the product material 4 to be ejected. In this configuration, the product material 4 can be ejected by simply pushing the moving mold base 206 upwards. It is important to note that the purpose of the delayed ejector pin 8 is not to delay the ejection of the sprue material 10, but rather to ensure that the sprue material 10 and the product material 4 are ejected synchronously. After the slider 205 provides demolding space for the product material 4, part of the sprue material 10 is still attached to the moving mold skeleton 204. There is a certain degree of adhesion between the sprue material 10 and the moving mold skeleton 204. Strong demolding will cause the product material 4 to break on the core mold 5. Therefore, if the sprue material 10 is not ejected synchronously, it is easy for the sprue material 10 and the product material 4 to break irregularly, resulting in defects in the product material 4. During strong demolding, before the product material 4 is ejected, the moving mold skeleton 204 has already undergone a small displacement. This displacement is sufficient to allow the sprue material 10 to peel off from the moving mold skeleton 204, facilitating subsequent demolding.

[0028] Looking back Figure 3, in this process, it should be noted that since the core mold 5 is fixed at the first moving mold base frame 203, when the second moving mold base frame 206 moves upward, the position of the core mold 5 will not be adjusted due to the movement of the second moving mold base frame 206. Meanwhile, positions of the second moving mold base frame 206 corresponding to the inclined guide pillars 201 all reserve spaces for the inclined guide pillars 201, that is, the inclined guide pillars 201 do not come into contact with the second moving mold base frame 206. Therefore, when the second moving mold base frame 206 rises relatively, it will not affect the predetermined position of the sliding block 205. The overall descending of the moving mold 2 is driven by an external driving source, which keeps the moving mold 2 descending as a whole but does not bind the first moving mold base frame 203 and the second moving mold base frame 206 at the same time. In other words, the first moving mold base frame 203 and the second moving mold base frame 206 can still move separately under an external force. The external driving source may be an oil cylinder, an air cylinder, or a carrier powered by an oil cylinder or an air cylinder.

[0029] Back to previous view Figure 3 , to ensure the smooth implementation of this embodiment, it should be understood that a sliding sleeve 601 is further provided at the position of the first moving mold base frame 203 coaxial with the direct ejector pin 6. A return spring 602 is arranged in the sliding sleeve 601, the direct ejector pin 6 is sleeved inside the return spring 602, the top end of the direct ejector pin 6 is a "convex"-shaped head, and the hole opened at the position of the first moving mold base frame 203 corresponding to the direct ejector pin 6 has at least the same diameter as the head or a diameter slightly larger than the diameter of the head to ensure the movement of the direct ejector pin 6. After the mold completes demolding and resetting, the direct ejector pin 6 can be reset under the action of the return spring 602.

[0030] A position block 9 is installed on the first moving mold base frame 203 at the position corresponding to the delayed ejector pin 8. The position block 9 is provided with a hole penetrating through both ends, and the delayed ejector pin 8 passes through the hole to come into contact with the direct ejector pin 6.

[0031] Although the embodiments of the present invention have been shown and described, it will be understood by those of ordinary skill in the art that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principle and spirit of the present invention, and the scope of the present invention is defined by the appended embodiments and their equivalents.

Claims

1. A mold suitable for single-cavity delayed ejection, comprising: The mold consists of a fixed mold (1), a moving mold (2), a bottom mold (3), a direct ejector pin (6), and a core mold (5). The fixed mold (1) and the moving mold (2) cooperate to form a flow channel and are directly abutted against the top of the direct ejector pin (6). Its characteristic is that: The moving mold (2) includes a moving mold skeleton (204), a number of sliders (205) and an eccentric sliding mechanism corresponding to the number of sliders (205). The sliders (205) are circumferentially arranged at the top position of the core mold (5). The sliders (205) are injection molded to form product material (4) after cooperating with the core mold (5) and the fixed mold (1). Several sliders (205) are attached to the surface of the product material (4), and the sliders (205) divide the surface of the product material (4) into several equal parts. Two sliders (205) are attached to the surface of the sprue material (10), and the two sliders (205) are attached to each other at the midpoint of the sprue material (10). During demolding, the product material (4) is ejected by the moving mold skeleton (204), and at the same time, the sprue material (10) is ejected by the direct ejector pin (6) and the product material (4) simultaneously.

2. A mold suitable for single-cavity delayed ejection according to claim 1, characterized in that: The moving mold (2) also includes a moving mold base frame one (203) and a moving mold base frame two (206). The moving mold base frame two (206) is located on top of the moving mold base frame one (203). The slider (205) is located at the moving mold skeleton (204). The moving mold skeleton (204) has slides in the same number as the slider (205) in the circumferential direction. A delayed ejector pin (8) is located directly below the direct ejector pin (6). A gap H2 is provided between the delayed ejector pin (8) and the direct ejector pin (6). A gap H1 is provided between the bottom of the slide of the moving mold skeleton (204) and the bottom of the product material (4). H1=H2.

3. A mold suitable for single-cavity delayed ejection according to claim 2, characterized in that: The bottom of the direct ejector pin (6) is located at the moving mold base frame (203), and an ejector plate (7) is provided at the bottom mold (3). The delayed ejector pin (8) is fixed at the position of the ejector plate (7), and the delayed ejector pin (8) is coaxially arranged with the direct ejector pin (6).

4. A mold suitable for single-cavity delayed ejection according to claim 3, characterized in that: The bottom end of the core mold (5) is fixed inside the moving mold base (203) and extends vertically upward to the injection molding point of the slider (205). Several ejector pins (12) are installed on the ejector plate (7). The moving mold base (206) is provided with a number of corresponding limiting shafts (13) at the positions of the ejector pins (12). The limiting shafts (13) are fixed to the top of the ejector pins (12). The ejector pins (12) pass through the moving mold base (203) and slide between the moving mold base (203) and the ejector pins (12). The telescopic spring (11) is located between the moving mold base (203) and the ejector plate (7). A fixed rod (14) is also installed on the ejector plate (7). The top of the fixed rod (14) is fixed to the moving mold base (203). A fixed cylinder (15) is also provided at the bottom of the mold.

5. A mold suitable for single-cavity delayed ejection according to claim 3, characterized in that: The moving mold base frame (203) is also provided with a sliding sleeve (601) at a position coaxial with the direct ejector pin (6). A return spring (602) is provided inside the sliding sleeve (601). The direct ejector pin (6) is sleeved inside the return spring (602). The top of the direct ejector pin (6) is a "convex" shaped end.

6. A mold suitable for single-cavity delayed ejection according to claim 2, characterized in that: The eccentric sliding mechanism includes a traction block (202) slidably installed at each slide of the moving mold skeleton (204). When the traction block (202) is in the initial state, the fixed mold (1) faces the moving mold (2) and an inclined guide post (201) is provided at each position of the traction block (202). The inclined guide post (201) is inclined from top to bottom in a direction away from the core mold (5), and a through hole with the same inclination angle as the inclined guide post (201) is opened through the traction block (202). The inclined guide post (201) is sleeved at the through hole.

7. A mold suitable for single-cavity delayed ejection according to claim 1, characterized in that: The core mold (5) is a single workpiece in the shape of a rod. After the moving mold (2) and the fixed mold (1) are closed, an injection cavity is formed at the top of the core mold (5).

8. A mold suitable for single-cavity delayed ejection according to claim 2, characterized in that: The number of the slides and sliders (205) is three. The intersection of the midpoints of the three slides corresponds to the position of the product material (4). The edges of the three sliders (205) that are in contact with each other divide the product material (4) into three equal parts. The edges of two adjacent sliders (205) that are in contact with each other divide the sprue material (10) into two equal parts.

9. A mold suitable for single-cavity delayed ejection according to claim 7, characterized in that: The flow channel formed by the fixed mold (1) and the moving mold (2) is located on one side of the injection cavity. In the initial state, an injection hole is formed between the sliders (205). The injection hole and the injection hole on the fixed mold (1) are coaxial to form a flow channel. The flow channel is connected to the injection cavity to realize the injection molding of the product material (4).

10. A mold suitable for single-cavity delayed ejection according to claim 2, characterized in that: When the mold is demolded, the moving mold (2) and the bottom mold (3) move downward synchronously. Each eccentric sliding mechanism synchronously controls the corresponding slider (205) to slide centrifugally along the slide to make room for the top space of the product material (4). Then the delayed ejector pin (8) moves closer to the direct ejector pin (6). At the same time, the moving mold skeleton (204) moves towards the product material (4). When the delayed ejector pin (8) contacts the direct ejector pin (6), the bottom of the slide of the moving mold skeleton (204) contacts the product material (4). The moving mold skeleton (204) and the delayed ejector pin (8) continue to perform the ejection action synchronously.

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