Plastic cover mold structure with bent pin structure and supporting structure

Abstract

The present invention discloses a mold structure for a plastic cover with a bent pin structure, including a left mold and a right mold. The two molds can be combined to inject a plastic cover. A rubber coating device and a mold changing device are also provided on the mold cavity. The mold changing device includes a first bottom cavity plate and a second bottom cavity plate. The first bottom cavity plate is slidably arranged on the right mold to serve as the bottom surface of the mold cavity in the right mold. After the injection molding is completed, the first bottom cavity plate can be opened to both sides to expose the bottom surface of the right mold cavity. The second bottom cavity plate is slidably arranged on the right mold and is located above the bottom surface of the right mold cavity. The mold structure for a plastic cover with a bent pin structure and a supporting structure of the present invention can complete the injection molding and rubber coating work on one injection molding machine, eliminating the process of taking out the parts and repositioning them after the injection molding is completed, thereby improving work efficiency. At the same time, holes are punched on the rubber coating surface and the rubber coating operation is performed when the injection molded parts are hot, so that the rubber coating has stronger adhesion and higher product stability.

Description

Technical Field

[0001] The invention relates to the technical field of overmolding, in particular to an overmolding plastic cover mold structure with a bent pin structure and a matching structure. Background Art

[0002] After the cup is injection molded, it is often necessary to coat the bottom or lid of the cup with a layer of glue so that it does not make a loud noise when the cup or lid is taken out. However, the bottom or lid of the cup needs to be coated with glue after the injection molding is completed, and then it needs to be re-installed into the overmolding mold for coating. The process of taking out and clamping often needs to be done manually.

[0003] At the same time, the bottom surface of the rubber lagging is often smooth, so the rubber lagging is easy to fall off. Summary of the invention

[0004] The present invention aims at the deficiencies in the prior art and provides a plastic cover mold structure with a bent pin structure and a matching structure.

[0005] In order to solve the above technical problems, the present invention is solved through the following technical solutions: a plastic cover mold structure with a bent pin structure, including a left mold and a right mold, which can be combined to inject a plastic cover, and the mold cavity is also provided with a glue-coating device and a mold changing device, the mold changing device includes a first bottom cavity plate, the first bottom cavity plate is slidably arranged on the right mold, and is used to serve as the bottom surface of the mold cavity in the right mold. After the injection molding is completed, the first bottom cavity plate can be opened to both sides to expose the bottom surface of the right mold cavity, and the second bottom cavity plate is slidably arranged on the right mold and is located above the bottom surface of the right mold cavity. After the first bottom cavity plate leaves the top of the bottom surface of the right mold cavity, the second bottom cavity plate can touch the bottom surface of the mold cavity and serve as a new bottom plate. A glue-coating cavity and a glue injection port are provided on the second bottom cavity plate. After the glue injection port injects glue into the glue-coating cavity, the glue-coating work of the bottom surface of the plastic cover is completed.

[0006] In the above scheme, preferably, the mold changing device also includes a bending pin and a hydraulic rod, the bending pin is arranged on the telescopic rod of the hydraulic rod, the hydraulic rod is arranged on the right mold, the first bottom cavity plate is slidably arranged on the inclined plate of the bending pin, and the first bottom cavity plate is slidably arranged on the right mold left and right at the same time, the bending pin is lifted upward to drive the first bottom cavity plate to slide outward, thereby opening the bottom surface of the cavity in the right mold.

[0007] The beneficial effect is that after the injection molding is completed, the mold can be automatically replaced to complete the rubber coating operation of the bottom surface.

[0008] In the above scheme, preferably, a guide column is provided on the right mold, the second bottom cavity plate is slidably provided on the guide column, and a first elastic member is provided on the guide column, and its two ends respectively contact the second bottom cavity plate and the right mold, and a first long groove is also opened on the second bottom cavity plate, and a first rotating shaft is slidably provided in the first long groove, and a second rotating shaft is provided on the side of the first bottom cavity plate, and the mold changing device also includes a first connecting rod, and the two ends of the first connecting rod are respectively rotatably provided on the first rotating shaft and the second rotating shaft.

[0009] The beneficial effect is that the replacement can be achieved automatically.

[0010] In the above scheme, preferably, two first bottom cavity plates are symmetrically arranged on the left and right, and the left and right first bottom cavity plates are each provided with a second rotating shaft, and one end of the first connecting rod is rotatably arranged on the second rotating shaft, and the other end is rotatably arranged on the second rotating shaft, and the first bottom cavity plate slides outward, driving the first rotating shaft to slide upward, and when the first bottom cavity plate completely leaves the second bottom cavity plate, the first rotating shaft just touches the end wall of the upper end of the first long groove, and the first bottom cavity plate continues to slide outward, driving the second bottom cavity plate to slide upward, so that it is combined with the right mold.

[0011] In the above scheme, preferably, a ejector part is also slidably arranged on the first bottom cavity plate, which can extend out of the bottom surface of the first bottom cavity plate and is provided with a plurality of sharp needles. After the left and right first bottom cavity plates are merged, the sharp needles can extend upward, and pinholes are left on the bottom surface of the plastic cover during injection molding. When the first bottom cavity plate is opened outward, the ejector part can be automatically retracted to make the rubber coating adhere more firmly.

[0012] In the above scheme, preferably, the first cavity plate is provided with a first inclined hole, the bent pin includes a first inclined plate, the first inclined plate is slidably arranged on the first inclined hole, and there is a gap between the first inclined plate and the first inclined hole, a sliding cavity is provided in the first bottom cavity plate, the upper end of the ejector pin is also provided with a first inclined block and a second guide post, the ejector pin is slidably arranged in the sliding cavity through the second guide post, and a second elastic member is sleeved on the second guide post, two ends of which respectively touch the sliding cavity and the upper end limit blocks of the second guide post, a sliding block is also slidably arranged in the first bottom cavity plate, the front end of which touches the first inclined block, and the rear end touches the first inclined plate, the bent pin slides downward, first slides in the first inclined hole, and after touching the front end surface of the first inclined hole, drives the first cavity plate to slide outward, and when the bent pin slides in the first inclined hole, the ejector pin is retracted downward under the action of the second elastic member, and the bottom surface of the pointed needle is flush with the bottom surface of the first bottom cavity plate.

[0013] In the above scheme, preferably, a locking hole is opened on the sliding block, and a locking pin is elastically slidably arranged in the first bottom cavity plate. The rear end of the locking pin is connected to one end of a pull rope, and the other end is arranged on the side wall of the right mold. When the left and right first bottom cavity plates are merged, the pull rope is tightened, and the locking pin leaves the position of the sliding block. When the sharp needle is retracted into the first bottom cavity plate, the locking hole is aligned with the locking pin, and the left and right first bottom cavity plates are separated, the pull rope is loosened, and the locking pin extends into the locking hole to lock the sliding block.

[0014] The beneficial effect is that holes are automatically left on the bottom surface of the cup cover during injection molding, and are automatically retracted when the molds are exchanged, so that the glue has stronger adhesion to the bottom surface of the cup cover during glue injection.

[0015] A matching structure that cooperates with the overmolded plastic cover mold structure with a bent pin structure as described in the claim includes a sol cavity, in which a sol liquid is arranged, and a glue outlet is arranged on it, which is connected with the glue injection port through a pipeline. A piston ring is arranged on the bent pin, and the piston ring is slidably arranged in the sol cavity. The hydraulic rod pushes forward to drive the piston ring to slide in the sol cavity, thereby increasing the pressure in the sol cavity and injecting the glue liquid into the overmolded cavity.

[0016] The beneficial effects of the present invention are as follows: the mold structure and supporting structure of the rubber-coated plastic cover with a bent pin structure of the present invention realize that the injection molding and rubber-coating work can be completed on one injection molding machine, eliminating the process of taking out and repositioning the parts after the injection molding is completed, thereby improving work efficiency. At the same time, holes are punched on the rubber-coated surface and the rubber-coating operation is performed when the injection molded parts are hot, so that the adhesion of the rubber-coated parts is stronger and the product stability is higher. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of the present invention.

[0018] Figure 2 It is a cross-sectional view of the present invention.

[0019] Figure 3 It is an internal schematic diagram of the present invention.

[0020] Figure 4 It is an internal transverse cross-sectional view of the present invention.

[0021] Figure 5 It is an internal longitudinal sectional view of the present invention.

[0022] Figure 6 It is a partial schematic diagram of the present invention. DETAILED DESCRIPTION

[0023] The present invention is further described in detail below in conjunction with the accompanying drawings and specific embodiments: Figure 1-Figure 6The mold structure of the plastic cover with a bent pin structure includes a left mold 1, a right mold 2, a mold changing device 4 and a sol cavity 5. The left mold 1 and the right mold 2 are combined for injection molding, and a cup cover can be formed by injection molding first. The mold changing device 4 includes a bent pin 41, a first bottom cavity plate 42, a second bottom cavity plate 43, a hydraulic rod 44, an ejector 45 and a first connecting rod 46. The first bottom cavity plate 42 is set on the right mold 2 for guiding sliding, and the first bottom cavity plate 42 is symmetrically arranged with two pieces. After the two pieces are combined, the bottom surface of the mold cavity of the right mold 2 is formed, and the left and right first bottom cavity plates 42 can move to both sides. After cutting open, the bottom surface of the cavity of the right mold 2 is completely exposed, and four guide pillars 21 are arranged on the right mold 2, and the second bottom cavity plate 43 is slidingly arranged on the guide pillars 21, and a first elastic member 22 is arranged on the guide pillars 21, and two ends thereof are respectively in contact with the second bottom cavity plate 43 and the right mold 2. When no force is applied, the second bottom cavity plate 43 is in a state of being separated from the right mold 2 under the action of the first elastic member 22. After the first bottom cavity plate 42 is removed, the second bottom cavity plate 43 can slide upward and press against the right mold 2, and a glue-encapsulating cavity 431 and a glue injection port 432 are provided on the bottom surface of the second bottom cavity plate 43.

[0024] After the cup cover is injection-molded, the left and right first bottom cavity plates 42 are opened to both sides. After being fully opened, the second bottom cavity plate 43 slides upward to complete the bottom film replacement work. After the encapsulating liquid is injected from the injection port 432, the encapsulating process of the cup cover bottom is completed.

[0025] The second bottom cavity plate 43 is also provided with a first long groove 433, in which a first rotating shaft 434 is slidably arranged, and the sides of the left and right first bottom cavity plates 42 are provided with second rotating shafts 421, and two first connecting rods 46 are provided, one end of each of which is rotatably arranged on the first rotating shaft 434, and the other end is rotatably arranged on the second rotating shafts 421 of the left and right first bottom cavity plates 42, respectively, and a first inclined hole 422 is provided on the first cavity plate 42, and the bent pin 41 includes a first inclined plate 411, which is slidably arranged on the first inclined hole 422, and there is a gap between the first inclined plate 411 and the first inclined hole 422, and the bent pin 41 is arranged on the telescopic rod of the hydraulic rod 44, and the hydraulic rod 44 is arranged on the right mold 2.

[0026] In the initial state, the hydraulic rod 44 is completely retracted, the first inclined plate 411 on the bent pin 41 contacts the inclined wall inside the first inclined hole 422, and the left and right first bottom cavity plates 42 contact each other. After the cup cover is injection-molded, the hydraulic rod 44 begins to extend, which drives the bent pin 41 to slide downward, and the first inclined plate 411 first breaks away from the contact with the inner inclined wall of the first inclined hole 422. After rising a certain distance, the outer wall of the first inclined plate 411 contacts the outer inclined wall of the first inclined hole 422. At this time, the bent pin 41 continues to slide downward, thereby driving the first bottom cavity plate 42 to open outward, thereby driving one end of the first connecting rod 46 The first bottom cavity plate 431 is moved outward, thereby causing the other end to slide upward along the first long groove 433. After the first bottom cavity plate 42 completely leaves the moving range of the second bottom cavity plate 43, the first rotating shaft 434 just touches the end wall at the upper end of the first long groove 433. At this time, the bending pin 41 continues to descend, thereby driving the first bottom cavity plate 42 to continue to open, and at the same time drives the second bottom cavity plate 43 to move upward to compress the first elastic member 22. Finally, the second bottom cavity plate 43 touches the right mold 2, and the glue-coating cavity 431 and the bottom surface of the cup cover after injection molding form a glue injection cavity again. At this time, glue is injected inward from the glue injection port 432 to complete the glue coating process for the bottom of the cup cover.

[0027] A sliding cavity 425 is provided in the first bottom cavity plate 42, and a sharp needle 451, a first inclined block 452 and a second guide column 453 are provided on the ejector member 45. The ejector member 45 is slidably arranged in the sliding cavity 425 through the sliding guide of the second guide column 453. There are multiple needle tips 451, which are located on the bottom surface of the ejector member 45. A through hole matching the needle tip is provided on the bottom surface of the first bottom cavity plate 42. A second elastic member 423 is also sleeved on the second guide column 453, and both ends of the second elastic member 423 are respectively in contact with the sliding cavity 425 and the upper limit blocks of the second guide column 453.

[0028] When the needle tip 451 is not subjected to force, the bottom surface of the needle tip 451 is flush with the bottom surface of the first bottom cavity plate 42 and is in a retracted state. When the ejector member 45 is pressed, the needle tip 451 extends downward.

[0029] A sliding block 424 is also slidably arranged in the first bottom cavity plate 42, and its front end contacts the first inclined block 452, and its rear end contacts the first inclined plate 411. A locking hole 426 is provided on the sliding block 424, and a locking pin 427 is elastically slidably arranged in the first bottom cavity plate 42. The rear end of the locking pin 427 is connected to one end of a pull rope, and the other end is arranged on the side wall of the right mold 2.

[0030] In the initial state, the left and right first bottom cavity plates 42 are merged together, the pull rope is in a tightened state, the front end of the locking pin 427 leaves the sliding travel range of the sliding block 424, and the ejector member 45 is in an extended state. At this time, the mold starts injection molding. After the injection molding is completed, the bent pin 41 starts to slide downward, the first inclined plate 411 starts to move downward, and breaks contact with the sliding block 424. The ejector member 45 slides into the first bottom cavity plate 42 under the action of the second elastic member 423. After being retracted, a hole is left on the bottom surface of the cup cover. At this time, the first inclined plate 411 just touches the outer inclined wall of the first inclined hole 422, thereby driving the first bottom cavity plate 42 to slide outward. While sliding outward, the rope is loosened, so that the locking pin 427 is immersed in the locking hole 426, thereby locking the sliding block 424 and connecting it with the first bottom cavity plate 42 as a whole for synchronous movement.

[0031] A glue outlet 51 is provided in the middle of the sol chamber 5, and the bottom end of the glue outlet 51 is located at the bottom of the sol chamber 5. There is high-temperature sol liquid in the sol chamber 5, and the bottom of the glue outlet 51 is located in the sol liquid. The upper end of the glue outlet 51 is connected with the glue injection port 432 through a pipeline, and a solenoid valve is provided at the glue injection port 432. A piston ring 412 is also provided on the bent pin 41, and the piston ring 412 is slidably provided in the sol chamber 5.

[0032] When the hydraulic rod 44 is extended, the piston ring 412 is driven to slide downward, thereby increasing the pressure in the sol chamber 5 and squeezing the sol liquid in the sol chamber 5 out from the glue outlet 432. When the solenoid valve is not opened, the pressure in the sol chamber 5 continues to increase with the extension of the hydraulic rod 44. When the solenoid valve is opened, the sol liquid is ejected from the glue injection port 432 and enters the glue encapsulation chamber 43.

[0033] A first pressure touch switch is arranged on the top surface of the second bottom cavity plate 43. When the second bottom cavity plate 43 touches the right mold 2, the first pressure touch switch is pressed, and the solenoid valve is controlled to open. When the second bottom cavity plate 43 returns upward, the pressure touch of the first pressure touch switch disappears, thereby controlling the solenoid valve to close.

[0034] The sol chamber 5 is a heat-insulating chamber, and is provided with an air inlet valve, which can automatically open to take in air when the internal air pressure is lower than the external air pressure. The hot melt in the sol chamber 5 is sufficient for the mold to be injected for a long time. When the internal hot melt adhesive is used up, it can be automatically dispensed by manual operation or an automatic detection device.

[0035] Its working principle or usage is as follows:

[0036] In the initial state, the first inclined plate 411 on the bent pin 41 contacts the inclined wall inside the first inclined hole 422, and the left and right first bottom cavity plates 42 contact each other, and the needle tip 451 is in a downwardly extended state. At this time, the injection molding machine performs injection molding on the mold to complete the injection molding of the cup cover. After the injection molding is completed, the hydraulic rod 44 begins to extend, which drives the bent pin 41 to slide downward, and the first inclined plate 411 first breaks away from the contact with the inner inclined wall of the first inclined hole 422. At this time, the pressure contact force of the rear end of the sliding block 424 disappears, so the force acting on the first inclined block 452 disappears, thereby making the ejector piece Under the action of the second elastic member 423, 45 is retracted upward into the first bottom cavity plate 42, leaving a pinhole on the bottom surface of the cup cover, and the elastic force of the second elastic member 423 is sufficient to enable the needle tip 451 to overcome the friction force of the injection molded part on it and return upward, and after the ejector pin 45 is completely retracted, the first inclined plate 411 just touches the outer inclined wall of the first inclined hole 422, thereby driving the first bottom cavity plate 42 to slide outward, and while sliding outward, the rope is loosened, so that the locking pin 427 is immersed in the locking hole 426, thereby locking the sliding block 424 and connecting it with the first bottom cavity plate 42 as a whole, and performing synchronous movement.

[0037] At this time, the bent pin 41 continues to slide downward, thereby driving the first bottom cavity plate 42 to open outward, thereby driving one end of the first connecting rod 46 to move outward, so that the other end thereof slides upward along the first long groove 433. After the first bottom cavity plate 42 completely leaves the moving range of the second bottom cavity plate 43, the first rotating shaft 434 just touches the end wall at the upper end of the first long groove 433. At this time, the bent pin 41 continues to descend, thereby driving the first bottom cavity plate 42 to continue to open, and at the same time driving the second bottom cavity plate 43 to move upward, compressing the first elastic member 22. Finally, the second bottom cavity plate 43 touches the right mold 2, and the glue-encapsulating cavity 431 and the bottom surface of the cup cover after injection molding form a glue injection chamber again. At this time, the first pressure touch switch is pressed, and the solenoid valve on the control injection port 432 is opened.

[0038] During the extension of the hydraulic rod 44, the piston ring 412 is driven to slide downward, thereby increasing the pressure in the sol chamber 5. When the solenoid valve is not opened, the pressure in the sol chamber 5 continues to increase with the extension of the hydraulic rod 44. When the solenoid valve is opened, the glue is sprayed out from the injection port 432 and enters the glue encapsulation cavity 43, completing the glue injection process. At this time, the pinholes in the cup cover are filled with glue, making the glue adhere more firmly.

[0039] After the glue injection is completed and the cooling is completed, the glue solidifies and the mold is removed to take out the finished cup cover.

[0040] After taking out, the hydraulic rod 44 retracts, driving the bending pin 41 to slide upward, and at this time the sliding block 424 is locked and connected with the first bottom cavity plate 42 as a whole for synchronous movement. Therefore, the inner wall of the first inclined plate 411 on the bending pin 41 touches the sliding block 424, driving the first bottom cavity plate 42 to slide toward the center, causing the first rotating shaft 434 to slide downward, causing the pressure contact force on the second bottom cavity plate 43 to disappear, and the second bottom cavity plate 43 returns to its initial state upward under the action of the first elastic member 22. When it is separated from the right mold, the pressure contact disappearance solenoid valve of the first pressure contact switch is closed.

[0041] After the first bottom cavity plate 42 moves inwards for a certain distance, the rope is tightened, and the first bottom cavity plate 42 continues to move inwards, pulling out the locking pin 427 outwards, thereby releasing the lock on the sliding block 424. At this time, the ejector parts 45 are all located above the bottom of the cavity of the right mold 2. At this time, the bent pin 41 continues to slide upwards, and after the left and right first bottom cavity plates 42 touch each other, the bent pin 41 continues to slide upwards, pressing the sliding block 424 inwards, and the front end of the sliding block 424 touches the first inclined block 452, causing the ejector part 45 to slide downward and enter the cavity of the right mold 2, so that everything returns to the initial state.

[0042] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit the same. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that the technical solutions described in the aforementioned embodiments may still be modified, or some of the technical features may be replaced by equivalents. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A plastic cover mold structure with a bent pin structure, characterized in that: It comprises a left mold (1) and a right mold (2), which can be combined to form a plastic cover by injection molding, and the mold cavity of the right mold (2) is also provided with a mold changing device (4); The mold changing device (4) comprises a first bottom cavity plate (42) and a second bottom cavity plate (43); the first bottom cavity plate (42) is slidably arranged on the right mold (2) and is used to serve as the bottom surface of the inner mold cavity of the right mold (2); after injection molding is completed, the first bottom cavity plate (42) can be opened to both sides to expose the bottom surface of the mold cavity of the right mold (2); the second bottom cavity plate (43) is slidably arranged on the right mold (2) and is located below the bottom surface of the mold cavity of the right mold (2); after the first bottom cavity plate (42) leaves the bottom surface of the mold cavity of the right mold (2), the second bottom cavity plate (43) can contact the bottom surface of the mold cavity and serve as a new bottom plate; The second bottom cavity plate (43) is provided with a glue encapsulating cavity (431) and a glue injection port (432). After the glue injection port (432) injects glue liquid into the glue encapsulating cavity (431), the glue encapsulation work of the bottom surface of the plastic cover is completed; The mold changing device (4) further comprises a bending pin (41) and a hydraulic rod (44), wherein the bending pin (41) is arranged on a telescopic rod of the hydraulic rod (44), the hydraulic rod (44) is arranged on the right mold (2), and the first bottom cavity plate (42) is slidably arranged on the inclined plate of the bending pin (41), and the bending pin (41) slides downward to drive the first bottom cavity plate (42) to slide outward, thereby opening the bottom surface of the inner cavity of the right mold (2); The right mold (2) is provided with a guide column (21), the second bottom cavity plate (43) is slidably arranged on the guide column (21), and a first elastic member (22) is arranged on the guide column (21), and its two ends respectively contact the second bottom cavity plate (43) and the right mold (2), and the second bottom cavity plate (43) is also provided with a first long groove (433), and a first rotating shaft (434) is slidably arranged in the first long groove (433), and a second rotating shaft (421) is arranged on the side of the first bottom cavity plate (42), and the mold changing device (4) further comprises a first connecting rod (46), and the two ends of the first connecting rod (46) are respectively rotatably arranged on the first rotating shaft (434) and the second rotating shaft (421); Two first bottom cavity plates (42) are symmetrically arranged on the left and right sides. A second rotating shaft (421) is arranged on each of the left and right first bottom cavity plates (42). One end of a first connecting rod (46) is rotatably arranged on each of the second rotating shafts (421). The other end of the first connecting rod (46) is rotatably arranged on the first rotating shaft (434). The first bottom cavity plate (42) slides outward, driving the first rotating shaft (434) to slide upward. When the first bottom cavity plate (42) completely leaves the second bottom cavity plate (43), the first rotating shaft (434) just touches the end wall at the upper end of the first long groove (433). The first bottom cavity plate (42) continues to slide outward, driving the second bottom cavity plate (43) to slide upward, so that the second bottom cavity plate (43) is combined with the right mold (2).

2. The mold structure for overmolding a plastic cover with a bent pin structure according to claim 1, characterized in that: The first bottom cavity plate (42) is also slidably provided with an ejector pin (45), which can extend out of the bottom surface of the first bottom cavity plate (42) and is provided with a plurality of sharp pins (451). After the left and right first bottom cavity plates (42) are combined, the sharp pins (451) can extend upwards. During injection molding, pinholes are left on the bottom surface of the plastic cover, which can be automatically retracted when the first bottom cavity plate (42) is opened outwards, so that the rubber coating adheres more firmly.

3. The mold structure for overmolding a plastic cover with a bent pin structure according to claim 2, characterized in that: The first bottom cavity plate (42) is provided with a first inclined hole (422), the bent pin (41) includes a first inclined plate (411), the first inclined plate (411) is slidably arranged on the first inclined hole (422), and a gap is provided between the first inclined plate (411) and the first inclined hole (422), a sliding cavity (425) is provided in the first bottom cavity plate (42), a first inclined block (452) and a second guide column (453) are further provided at the upper end of the ejector pin (45), the ejector pin (45) is slidably arranged in the sliding cavity (425) through the second guide column (453), and a second elastic member (423) is sleeved on the second guide column (453), and the two ends of the second elastic member (423) are respectively ejected. The first bottom cavity plate (42) is provided with a sliding block (424) which contacts the upper limit block of the sliding cavity (425) and the second guide column (453). The front end of the sliding block (424) contacts the first inclined block (452) and the rear end contacts the first inclined plate (411). The bent pin (41) slides downward, first slides in the first inclined hole (422), and after contacting the front end surface of the first inclined hole (422), the first cavity plate (42) is driven to slide outward. When the bent pin (41) slides in the first inclined hole (422), the ejector pin (45) is retracted downward under the action of the second elastic member (423), and the bottom surface of the pointed pin (451) is flush with the bottom surface of the first bottom cavity plate (42).

4. The mold structure for overmolding a plastic cover with a bent pin structure according to claim 3, characterized in that: The sliding block (424) is provided with a locking hole (426), and a locking pin (427) is elastically slidably arranged in the first bottom cavity plate (42). The rear end of the locking pin (427) is connected to one end of a pull rope, and the other end is arranged on the side wall of the right mold (2). When the left and right first bottom cavity plates (42) are merged, the pull rope is tightened, and the locking pin (427) leaves the position of the sliding block (424). When the pointed needle (451) is received in the first bottom cavity plate (42), the locking hole (426) is aligned with the locking pin (427), the left and right first bottom cavity plates (42) are separated, the pull rope is loosened, and the locking pin (427) extends into the locking hole (426) to lock the sliding block (424).

5. A matching structure for cooperating with the plastic cover mold structure with a bent pin structure as claimed in claim 1, characterized in that: The invention comprises a sol chamber (5) in which a sol liquid is arranged. A glue outlet (51) is arranged in the middle of the sol chamber (5). The glue outlet (51) is connected to a glue injection port (432) through a pipeline. A piston ring (412) is arranged on the bent pin (41). The piston ring (412) is slidably arranged in the sol chamber (5). When the hydraulic rod (44) is extended, the piston ring (412) is driven to slide downward in the sol chamber (5), thereby increasing the pressure in the sol chamber (5) and injecting the glue liquid into the glue encapsulation chamber (431).

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