Metal casting mold for preventing casting defects

Abstract

This invention relates to the field of casting mold technology, and more particularly to a metal casting mold for preventing casting defects. The mold includes a lower mold and an upper mold. A mounting plate is fixedly installed at the lower end of the lower mold. An ejector mechanism is provided between the mounting plate and the lower mold. A connecting frame is connected to one side of the upper surface of the mounting plate via a moving mechanism. A support frame is fixedly connected to the front end of the connecting frame. Two sliding openings are formed through the front surface of the support frame. A lifting rod is slidably connected vertically to the inner side of each sliding opening. A moving strip is slidably inserted into the inner side of the lifting rod via a reset mechanism. A movable opening is formed at the front end of the lifting rod. The front end of the moving strip extends to the inner side of the movable opening and is fixedly connected to a bent end. This invention utilizes the lifting rod to receive and transfer the demolding sand core, reducing sand drop and casting defects. It also allows for tilted transport, reducing material handling difficulty and improving operational efficiency.

Description

Technical Field

[0001] This invention relates to the field of casting mold technology, and more particularly to a metal casting mold for preventing casting defects. Background Technology

[0002] In the metal casting process, for the production of castings with S-shaped exhaust pipes, it is necessary to use a special sand core forming mold to complete the pre-processing of the exhaust pipe sand core. The forming quality of the sand core directly determines the forming accuracy and yield of the inner wall of the exhaust pipe in the subsequent casting.

[0003] The existing mold uses a traditional upper and lower mold closing structure. The S-shaped vent pipe sand core has an irregularly curved structure, with an overall continuous curved spatial surface shape. It has no straight stress surface and no straight demolding channel, which is significantly different from the demolding structure of conventional straight sand cores. After the sand core is cast, solidified, and shaped, the operator must remove the sand core within the gap between the upper and lower molds. Because the internal forming cavity space is sealed and narrow after the upper and lower molds are closed, removing it by directly lifting and sliding makes the removal process cumbersome, time-consuming, and extremely difficult.

[0004] Meanwhile, manual removal involves unavoidable operational errors and stability issues. The S-shaped sand core has a curved and slender overall structure, making it highly susceptible to impacts, scratches, and compression between the outer wall of the sand core and the inner walls of the upper and lower mold cavities during demolding due to uneven force applied by hand or deviations in the offset angle. This can result in minor scratches, burrs, or localized sand loss on the outer wall of the sand core, or more serious issues such as cracking, damage, uneven wall thickness, or even partial breakage and detachment at the bent parts of the sand core.

[0005] Various defects generated during the sand core removal process can be directly inherited by subsequent casting processes. During the subsequent casting of molten metal, damaged sand cores cannot accurately limit the molten metal's shape, and sand loss can lead to sand holes, pores, and pits on the inner wall of the exhaust pipe. Cracks and defects in the sand core can cause casting defects such as bulges, burrs, excessive wall thickness, and localized material shortages on the inner wall of the exhaust pipe, increasing raw material consumption and labor costs. Therefore, a metal casting mold to prevent casting defects is proposed. Summary of the Invention

[0006] The purpose of this invention is to address the shortcomings of the prior art by proposing a metal casting mold that prevents casting defects.

[0007] To achieve the above objectives, the technical solution adopted by the present invention is as follows: a metal casting mold for preventing casting defects, comprising a lower mold and an upper mold, wherein a mounting plate is fixedly provided at the lower end of the lower mold, an ejector mechanism is provided between the mounting plate and the lower mold, a connecting frame is connected to one side of the upper surface of the mounting plate through a moving mechanism, a support frame is fixedly connected to the front end of the connecting frame, two sliding openings are provided through the front surface of the support frame, a lifting rod is slidably connected to the inner side of each sliding opening along the vertical direction, a moving strip is slidably inserted into the inner side of the lifting rod through a reset mechanism, a movable opening is provided at the front end of the lifting rod, a bent end is fixedly connected to the front end of the movable opening, a limiting plate is rotatably connected to the inner side of the movable opening, an inclined guide plate is fixedly connected to the rear end of the limiting plate, a beveled surface is provided at the lower rear end of the inclined guide plate, a lifting plate is connected to the front end of the upper surface of the connecting frame and below each lifting rod through a lifting mechanism, a triangular block is fixedly connected to the rear end of the lower surface of the moving strip, and a pushing component is provided on the upper surface of the lifting plate;

[0008] During the upward movement of the lifting plate, the pushing component pushes the triangular block forward, causing the moving strip to move forward synchronously. The bent end first fits against the pushing oblique surface, and then the moving strip continues to move forward and pushes the oblique guide plate, driving the limiting plate to rotate upward and tilt up.

[0009] Preferably, the moving mechanism includes a telescopic rod fixedly installed on one side of the upper surface of the mounting plate, a sliding plate fixedly connected to the telescopic end of the telescopic rod, guide bars fixedly connected to both sides of the lower surface of the sliding plate, slide rails fixedly connected to the upper surface of the mounting plate and the two sides near the telescopic rod, the guide bars slidingly engaging with the slide rails, and one end of the connecting frame fixedly connected to the upper surface of the sliding plate.

[0010] Preferably, the reset mechanism includes a slot formed inside the lifting rod, a movable bar slidably inserted into the inner side of the slot, a guide opening at the rear end of the slot, the triangular block slidably inserted into the inner side of the guide opening, a guide rod fixedly connected to the inner wall of the guide opening, a compression spring sleeved on the outer surface of the guide rod, and the compression spring located on the front surface of the triangular block.

[0011] Preferably, rotating shafts are fixedly connected to both sides of the limiting plate, and the rotating shafts are rotatably connected to the inner wall of the movable opening.

[0012] Preferably, the lifting mechanism includes a long-distance cylinder and a short-distance cylinder fixedly installed at the front end of the upper surface of the connecting frame. The telescopic ends of the long-distance cylinder and the short-distance cylinder are respectively fixedly connected to the lower surface of the lifting plate above the connecting frame. A stabilizing rod slides through the edge of the upper surface of the lifting plate. An end seat is fixedly connected to the upper end of the stabilizing rod. The front end of the end seat is fixedly connected to the upper side of the support frame.

[0013] Preferably, the pushing component includes two wheel seats fixedly mounted on the upper surface of the lifting plate, and a contact wheel is rotatably mounted between the two wheel seats, with the contact wheel located below the triangular block.

[0014] Preferably, a support plate is slidably connected to the front surface of the support frame along the vertical direction, a lead screw is threaded through the upper surface of the support plate, the two ends of the lead screw are respectively rotatably connected to the support frame, a servo motor is fixedly installed at the upper end of the support frame, the output shaft of the servo motor is fixedly connected to the upper end of the lead screw, the support plate contacts the lower surface of the lifting rod, and sliders are fixedly provided at the rear ends of both sides of the lifting rod, with the sliders slidingly engaging with the sliding openings.

[0015] Preferably, the ejector mechanism includes an ejector cylinder fixedly mounted on the upper surface of the mounting plate, a top plate fixedly connected to the telescopic end of the ejector cylinder, a plurality of ejector pins fixedly connected to the upper surface of the top plate, the upper end of the ejector pins being slidably inserted into the inner bottom surface of the lower mold, and an injection hole being provided on one side of the inner wall of the lower mold.

[0016] Compared with the prior art, the present invention has the following beneficial effects:

[0017] 1. After the sand core is ejected from the mold by the ejector pin mechanism, the present invention uses a lifting rod to support and smoothly transfer the sand core as a whole, so that the sand core can be quickly moved out of the mold working area between the upper and lower molds. This eliminates the traditional method of picking up parts between molds, effectively reduces the problems of collision, scratching and sand falling between the sand core and the mold cavity and surrounding parts, effectively ensures the integrity of the overall structure of the sand core, and avoids various casting defects such as sand holes, pits and burrs on the inner wall of the vent pipe during subsequent molten metal pouring.

[0018] 2. In the process of sand core transfer, the present invention can adjust the sand core to an inclined posture for transfer. Compared with the traditional flat picking method, it greatly reduces the difficulty of manual grasping. Operators can complete the picking operation more easily and safely, optimize the overall operation process, reduce the picking time, reduce the intensity of manual operation, effectively improve the overall operation efficiency of sand core picking and circulation, and adapt to the needs of continuous casting production. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the lower mold portion of a metal casting mold for preventing casting defects according to the present invention.

[0020] Figure 2 This is a cross-sectional view of the support frame of a metal casting mold for preventing casting defects according to the present invention.

[0021] Figure 3 This invention relates to a metal casting mold for preventing casting defects. Figure 2 Enlarged view of point A in the middle;

[0022] Figure 4 This invention relates to a metal casting mold for preventing casting defects. Figure 2 Enlarged view at point B in the middle;

[0023] Figure 5 This is a schematic diagram of the support frame of a metal casting mold for preventing casting defects according to the present invention.

[0024] Figure 6 This is a schematic diagram of the moving mechanism of a metal casting mold for preventing casting defects according to the present invention.

[0025] Figure 7 This is a schematic diagram of the sand core lifting process of a metal casting mold for preventing casting defects according to the present invention.

[0026] Figure 8 This invention relates to a metal casting mold for preventing casting defects. Figure 7 Enlarged view at point C;

[0027] Figure 9 This is a partial cross-sectional view of the limiting plate of a metal casting mold for preventing casting defects during rotation, according to the present invention.

[0028] Figure 10 This is a schematic diagram of the upper mold of a metal casting mold for preventing casting defects according to the present invention.

[0029] Figure 11 This is a schematic diagram illustrating the use of a core shooter with a metal casting mold for preventing casting defects according to the present invention.

[0030] The components are as follows: 1. Mounting plate; 2. Lower mold; 3. Connecting frame; 4. Support frame; 5. Lifting rod; 6. Slider; 7. Slide opening; 8. Slot; 9. Moving bar; 10. Bent end; 11. Movable opening; 12. Limiting plate; 13. Inclined guide plate; 14. Beveled surface; 15. Rotating shaft; 16. Guide opening; 17. Triangular block; 18. Guide rod; 19. Compression spring; 20. Lifting plate; 21. Contact wheel; 22. Wheel seat; 23. Long-distance cylinder; 24. Short-distance cylinder; 25. Stabilizing rod; 26. End seat; 27. Servo motor; 28. Support plate; 29. ​​Lead screw; 30. Sliding plate; 31. Telescopic rod; 32. Slide rail; 33. Guide bar; 34. Ejector pin; 35. Ejector plate; 36. Ejector cylinder; 37. Injection hole; 38. Upper mold. Detailed Implementation

[0031] The following description is intended to disclose the invention and enable those skilled in the art to implement it. The preferred embodiments described below are merely examples, and other obvious variations will occur to those skilled in the art.

[0032] like Figure 1 - Figure 11The metal casting mold shown includes a lower mold 2 and an upper mold 38 to prevent casting defects. A mounting plate 1 is fixedly installed at the lower end of the lower mold 2. An ejector mechanism is provided between the mounting plate 1 and the lower mold 2. A connecting frame 3 is connected to one side of the upper surface of the mounting plate 1 via a moving mechanism. A support frame 4 is fixedly connected to the front end of the connecting frame 3. Two sliding openings 7 are formed through the front surface of the support frame 4. A lifting rod 5 is slidably connected vertically inside each sliding opening 7. A moving strip 9 is slidably inserted into the inner side of the lifting rod 5 via a reset mechanism. The front end has an opening 11. The front end of the moving bar 9 extends to the inside of the opening 11 and is fixedly connected to a bent end 10. The inside of the opening 11 is rotatably connected to a limit plate 12. The rear end of the limit plate 12 is fixedly connected to an inclined guide plate 13. The lower rear end of the inclined guide plate 13 has a beveled surface 14. The front end of the upper surface of the connecting frame 3 and the lower part of each lifting rod 5 are respectively connected to a lifting plate 20 through a lifting mechanism. The rear end of the lower surface of the moving bar 9 is fixedly connected to a triangular block 17. The upper surface of the lifting plate 20 is provided with a pushing component.

[0033] During the upward movement of the lifting plate 20, the pushing component pushes the triangular block 17 forward, causing the moving strip 9 to move forward synchronously. The bent end 10 first fits against the pushing oblique surface 14, and then the moving strip 9 continues to move forward and pushes the oblique guide plate 13, driving the limiting plate 12 to rotate upward and tilt up.

[0034] The moving mechanism includes a telescopic rod 31 fixedly installed on one side of the upper surface of the mounting plate 1. A sliding plate 30 is fixedly connected to the telescopic end of the telescopic rod 31. Guide bars 33 are fixedly connected to both sides of the lower surface of the sliding plate 30. Slide rails 32 are fixedly connected to both sides of the upper surface of the mounting plate 1 near the telescopic rod 31. The guide bars 33 and slide rails 32 slide in cooperation to ensure smooth and stable movement, and at the same time play a limiting and guiding role to prevent the sliding plate 30 from shifting or shaking. One end of the connecting frame 3 is fixedly connected to the upper surface of the sliding plate 30. The connecting frame 3 moves back and forth synchronously with the sliding plate 30.

[0035] The reset mechanism includes a slot 8 inside the lifting rod 5. A moving bar 9 is slidably inserted into the inside of the slot 8. A guide port 16 is provided at the rear end of the slot 8. A triangular block 17 is slidably inserted into the inside of the guide port 16. A guide rod 18 is fixedly connected to the inner wall of the guide port 16. A compression spring 19 is sleeved on the outer surface of the guide rod 18. The compression spring 19 is located on the front surface of the triangular block 17. With the elastic rebound force of the compression spring 19, the triangular block 17 and the moving bar 9 can be driven to reset quickly.

[0036] The two sides of the limiting plate 12 are respectively fixedly connected to the rotating shaft 15. The rotating shaft 15 is rotatably connected to the inner wall of the movable port 11, which can effectively limit the rotation trajectory of the limiting plate 12 and avoid jamming or deviation during operation.

[0037] The lifting mechanism includes a long-distance cylinder 23 and a short-distance cylinder 24 fixedly installed at the front end of the upper surface of the connecting frame 3. The telescopic ends of the long-distance cylinder 23 and the short-distance cylinder 24 are respectively fixedly connected to the lower surface of the lifting plate 20 above the application. A stabilizing rod 25 slides through the edge of the upper surface of the lifting plate 20. An end seat 26 is fixedly connected to the upper end of the stabilizing rod 25. The front end of the end seat 26 is fixedly connected to the upper side of the support frame 4. The stabilizing rod 25 can effectively limit the swaying and deviation of the lifting plate 20, ensure that its lifting process is vertical and stable, and improve the overall operation accuracy and structural stability.

[0038] The pushing component includes two wheel seats 22 fixedly installed on the upper surface of the lifting plate 20. A contact wheel 21 is rotatably installed between the two wheel seats 22. The wheel seats 22 can provide stable support for the contact wheel 21, ensuring stable rotation. The contact wheel 21 is located below the triangular block 17, which effectively reduces contact friction, reduces component wear, and improves the smoothness of operation and service life. After the contact wheel 21 pushes the triangular block 17, the contact wheel 21 moves into the inner side of the guide port 16. At this time, the lifting plate 20 contacts the rear end of the lower surface of the lifting rod 5, ensuring that the lifting rod 5 can continue to be lifted.

[0039] A support plate 28 is vertically slidably connected to the front surface of the support frame 4 to ensure that the support plate 28 does not deviate while sliding vertically. A lead screw 29 is threaded through the upper surface of the support plate 28. The two ends of the lead screw 29 are rotatably connected to the support frame 4. A servo motor 27 is fixedly installed at the upper end of the support frame 4. The output shaft of the servo motor 27 is fixedly connected to the upper end of the lead screw 29. The support plate 28 contacts the lower surface of the lifting rod 5. Slider blocks 6 are fixedly installed at the rear ends of both sides of the lifting rod 5. The sliders 6 slide with the sliding mouth 7 to effectively constrain the movement trajectory and ensure that the lifting rod 5 slides smoothly without deviation or jamming.

[0040] The ejector mechanism includes an ejector cylinder 36 fixedly mounted on the upper surface of the mounting plate 1. The telescopic end of the ejector cylinder 36 is fixedly connected to a top plate 35. The telescopic movement of the ejector cylinder 36 drives the top plate 35 to rise and fall smoothly as a whole. Several ejector pins 34 are fixedly connected to the upper surface of the top plate 35. The upper ends of the ejector pins 34 slide into the inner bottom surface of the lower mold 2. An injection hole 37 is provided on one side of the inner wall of the lower mold 2. High-pressure core sand from the core shooting machine is injected into the internal cavity formed by the lower mold 2 and the upper mold 38 through the injection hole 37. The core sand compacts and solidifies within the cavity, completing the initial core forming. During use... Figure 11 As shown, it is fixed inside the core shooting machine by mounting plate 1. A specific example can be used in a horizontal parting (horizontal) core shooting machine, where core shooting is performed through the horizontal injection hole 37.

[0041] After the lower mold 2 and the upper mold 38 are closed, the core injection operation is completed through the injection hole 37, forming a venting bend sand core in the cavity formed by the lower mold 2 and the upper mold 38. After the lower mold 2 and the upper mold 38 are separated, the top cylinder 36 drives the top plate 35 to move upward, and the ejector pin 34 ejects the sand core out of the mold. Then the telescopic rod 31 retracts, driving the sliding plate 30, the connecting frame 3, and the support frame 4 to move forward synchronously until the front end of the lifting rod 5 reaches the position below both ends of the sand core. Then the long-distance cylinder 23 and the short-distance cylinder 24 are controlled to extend upward synchronously. During the upward movement of the lifting plate 20, the contact wheel 21 pushes the triangular block 17 forward and squeezes the compression spring 19, synchronously driving the moving bar 9 to move forward; the bent end 10 of the moving bar 9 first contacts the beveled surface 14 and applies a pushing force, driving the limiting plate 12 to rotate around the rotating shaft 15. At this time, the state is as follows. Figure 9 As shown, as the moving strip 9 continues to move forward, its front end further pushes against the inclined guide plate 13, causing the limiting plate 12 to continue rotating until the inclined surface 14 is in contact with the upper surface of the moving strip 9. The limiting plate 12 then completes its upward rotation and reaches its limit position. At this time, the two limiting plates 12 on both sides are respectively positioned on the front sides of both ends of the sand core, as shown in the figure. Figure 7 , Figure 8 As shown. The long-distance cylinder 23 then extends further, and the corresponding side lifting rod 5 lifts one end of the sand core, causing the entire sand core to tilt. The side limiting plates 12 effectively block the sand core, preventing it from slipping off the surface of the lifting rod 5. The subsequent telescopic rod 31 continues to retract, and the lifting rod 5, carrying the sand core, moves forward, causing the sand core to detach from the mold area between the upper mold 38 and the lower mold 2. The tilted placement of the sand core facilitates operator removal, solving the problem of sand core collisions caused by traditional removal methods operating in mold gaps, ensuring the integrity of the sand core structure, and avoiding defects in the inner wall of the vent pipe during subsequent casting processes.

[0042] This structure, through the special design of the bent end 10, avoids jamming and damage to the moving bar 9 during its advancement due to excessive tilt angle of the inclined guide plate 13. Relying on the action logic of the bent end 10 prioritizing contact with the inclined surface 14 and pushing it forward, the inclined guide plate 13 completes its angle rotation beforehand, and then, in conjunction with subsequent thrust, completes the overall movement, resulting in a smoother and more stable operation.

[0043] The pin 34 is positioned below the two lifting rods 5 to ensure that it does not interfere with the subsequent movement of the lifting rods 5.

[0044] By controlling the operation of the servo motor 27, the lead screw 29 is rotated, which in turn causes the support plate 28 to move up or down, changing the initial height of the two lifting rods 5, ensuring that when the support frame 4 moves forward, it can be positioned below the sand core, making adjustment convenient.

[0045] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely principles of the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed invention. The scope of protection claimed by the appended claims and their equivalents is defined.

Claims

1. A metal casting mold for preventing casting defects, comprising a lower mold (2) and an upper mold (38), characterized in that: A mounting plate (1) is fixedly installed at the lower end of the lower mold (2). An ejector pin mechanism is provided between the mounting plate (1) and the lower mold (2). A connecting frame (3) is connected to one side of the upper surface of the mounting plate (1) through a moving mechanism. A support frame (4) is fixedly connected to the front end of the connecting frame (3). Two sliding openings (7) are opened through the front surface of the support frame (4). A lifting rod (5) is slidably connected vertically inside each sliding opening (7). A moving strip (9) is slidably inserted into the inner side of the lifting rod (5) through a reset mechanism. An movable opening (11) is opened at the front end of the lifting rod (5). The front end of the moving bar (9) extends to the inside of the movable opening (11) and is fixedly connected to a bent end (10). The inside of the movable opening (11) is rotatably connected to a limiting plate (12). The rear end of the limiting plate (12) is fixedly connected to an inclined guide plate (13). The lower rear end of the inclined guide plate (13) is provided with a beveled surface (14). The front end of the upper surface of the connecting frame (3) and the lower part of each lifting rod (5) are respectively connected to a lifting plate (20) through a lifting mechanism. The rear end of the lower surface of the moving bar (9) is fixedly connected to a triangular block (17). The upper surface of the lifting plate (20) is provided with a pushing component. During the upward movement of the lifting plate (20), the pushing member pushes the triangular block (17) forward, causing the moving strip (9) to move forward synchronously. The bent end (10) first fits against the pushing oblique surface (14), and then the moving strip (9) continues to move forward and pushes the oblique guide plate (13), driving the limiting plate (12) to rotate upward and tilt up.

2. A metal casting mold for preventing casting defects according to claim 1, characterized in that: The moving mechanism includes a telescopic rod (31) fixedly installed on one side of the upper surface of the mounting plate (1). The telescopic end of the telescopic rod (31) is fixedly connected to a sliding plate (30). Guide bars (33) are fixedly connected to both sides of the lower surface of the sliding plate (30). Slide rails (32) are fixedly connected to both sides of the upper surface of the mounting plate (1) and close to the telescopic rod (31). The guide bars (33) and slide rails (32) slide in cooperation. One end of the connecting frame (3) is fixedly connected to the upper surface of the sliding plate (30).

3. A metal casting mold for preventing casting defects according to claim 1, characterized in that: The reset mechanism includes a slot (8) opened inside the lifting rod (5), a moving bar (9) is slidably inserted into the inner side of the slot (8), a guide opening (16) is opened at the rear end of the slot (8), the triangular block (17) is slidably inserted into the inner side of the guide opening (16), a guide rod (18) is fixedly connected to the inner wall of the guide opening (16), a compression spring (19) is sleeved on the outer surface of the guide rod (18), and the compression spring (19) is located on the front surface of the triangular block (17).

4. A metal casting mold for preventing casting defects according to claim 1, characterized in that: The two sides of the limiting plate (12) are respectively fixedly connected to the rotating shaft (15), and the rotating shaft (15) is rotatably connected to the inner wall of the movable opening (11).

5. A metal casting mold for preventing casting defects according to claim 1, characterized in that: The lifting mechanism includes a long-distance cylinder (23) and a short-distance cylinder (24) fixedly installed at the front end of the upper surface of the connecting frame (3). The telescopic ends of the long-distance cylinder (23) and the short-distance cylinder (24) are respectively fixedly connected to the lower surface of the lifting plate (20) above the application. A stabilizing rod (25) slides through the edge of the upper surface of the lifting plate (20). An end seat (26) is fixedly connected to the upper end of the stabilizing rod (25). The front end of the end seat (26) is fixedly connected to the upper side of the support frame (4).

6. A metal casting mold for preventing casting defects according to claim 1, characterized in that: The pushing component includes two wheel seats (22) fixedly installed on the upper surface of the lifting plate (20), and a contact wheel (21) is rotatably installed between the two wheel seats (22), the contact wheel (21) being located below the triangular block (17).

7. A metal casting mold for preventing casting defects according to claim 1, characterized in that: The front surface of the support frame (4) is vertically slidably connected to a support plate (28). A lead screw (29) is threaded through the upper surface of the support plate (28). The two ends of the lead screw (29) are rotatably connected to the support frame (4). A servo motor (27) is fixedly installed at the upper end of the support frame (4). The output shaft of the servo motor (27) is fixedly connected to the upper end of the lead screw (29). The support plate (28) contacts the lower surface of the lifting rod (5). Slider blocks (6) are fixedly installed at the rear ends of both sides of the lifting rod (5). The sliders (6) are slidably engaged with the sliding opening (7).

8. A metal casting mold for preventing casting defects according to claim 1, characterized in that: The ejector mechanism includes an ejector cylinder (36) fixedly installed on the upper surface of the mounting plate (1). The telescopic end of the ejector cylinder (36) is fixedly connected to a top plate (35). A plurality of ejector pins (34) are fixedly connected to the upper surface of the top plate (35). The upper end of the ejector pin (34) is slidably inserted into the inner bottom surface of the lower mold (2). An injection hole (37) is provided on one side of the inner wall of the lower mold (2).

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