Threaded core-pulling mechanism in injection mold

Abstract

The utility model discloses a kind of injection mold internal thread core-pulling mechanism, including bottom plate, the top four corners of bottom plate are uniformly fixedly connected with support leg, the top of support leg is fixedly connected with mounting seat, the top of mounting seat is fixedly connected with fixed mould, the inside of fixed mould is slidably connected with multiple thimbles, the bottom of thimble is fixedly connected with backing plate, the bottom of backing plate is provided with limit plate, the limit plate is fixedly connected in the bottom of mounting seat, the bottom of backing plate is symmetrically provided with two slide rods, two the slide rod and limit plate are slidably connected, the surface of slide rod is movably sleeved with connecting spring. The utility model is by starting motor one, convex rib plate rotates, waits to rotate a certain angle and lifts batten upward, slide rod slides in limit plate, connecting spring is extruded and shrinks, thimble slides in fixed mould inside, to lift product upward, and due to the elastic force of connecting spring can slow down the speed of thimble moving up, avoid to cause damage to product.

Description

Technical Field

[0001] This utility model relates to the field of injection mold technology, specifically to an internal thread core-pulling mechanism for injection molds. Background Technology

[0002] Injection molds are tools used to produce plastic products; they also give plastic products their complete structure and precise dimensions. Injection molding is a processing method used for the mass production of certain complex-shaped parts. Specifically, it refers to injecting molten plastic into a mold cavity under high pressure using an injection molding machine, and then cooling and solidifying it to obtain the molded product.

[0003] According to announcement number CN206796433U, an internal thread core-pulling structure for an injection mold includes a stud core with an external thread corresponding to the internal threaded hole of the product. A drive shaft is located at the tail end of the stud core, and a synchronous stud is mounted on the drive shaft. A synchronous threaded sleeve is threaded to the outer side of the synchronous stud. The pitch of the synchronous stud is the same as that of the stud core. The drive shaft is connected to a core-pulling power source via a transmission mechanism. After the product is formed, the core-pulling power source causes the drive shaft to rotate. At this time, the synchronous stud rotates and moves axially within the synchronous threaded sleeve, thereby causing the stud core to move axially while rotating, achieving automatic core-pulling. Then, the injection mold begins to separate, and the product is ejected through the ejection mechanism of the injection mold, allowing the product to be removed from the injection mold. This invention is not only simple and reliable in structure, but also ensures that the internal threaded hole is not damaged during core-pulling and is beneficial to improving production efficiency.

[0004] The product can be ejected through the ejection mechanism, making it convenient to remove the material. However, during the ejection process, excessive force may be applied, causing damage to the product. Utility Model Content

[0005] The purpose of this invention is to provide a core-pulling mechanism for internal threads in injection molds to solve the problems mentioned in the background art.

[0006] To achieve the above objectives, this utility model provides the following technical solution: a core-pulling mechanism for an internal thread of an injection mold, comprising a base plate, with four feet fixedly connected to the top of the base plate, a mounting base fixedly connected to the top of each foot, a fixed mold fixedly connected to the top of the mounting base, a plurality of ejector pins slidably connected inside the fixed mold, a pad fixedly connected to the bottom of each ejector pin, a limit plate provided at the bottom of the pad, the limit plate fixedly connected to the bottom of the mounting base, two sliding rods symmetrically arranged at the bottom of the pad, the two sliding rods slidably connected to the limit plate, a connecting spring movably sleeved on the surface of each sliding rod, and a lifting plate fixedly connected to the bottom of each sliding rod.

[0007] As a further preferred embodiment of this technical solution, the bottom of the fixed mold is provided with multiple through holes, the number of which is matched with the number of ejector pins. The ejector pins pass through the through holes and extend into the interior of the mounting base. The connecting spring is located between the limiting plate and the lifting plate.

[0008] As a further preferred embodiment of this technical solution, a motor base is fixedly connected to the top of the base plate, a motor is fixedly connected to the top of the motor base, and a convex rib plate is fixedly sleeved on the output shaft of the motor, with the convex rib plate in contact with the bottom of the lifting plate.

[0009] As a further preferred embodiment of this technical solution, a guide groove is provided at one top end of the mounting base, a support plate is fixedly connected to the side of the mounting base near the guide groove, and a cylinder is fixedly connected to the top of the support plate.

[0010] As a further preferred embodiment of this technical solution, a mounting bracket is slidably connected inside the guide groove. The mounting bracket is fixedly connected to the output rod of the cylinder. A second motor is fixedly connected to the side of the mounting bracket near the cylinder. A connecting shaft is fixedly connected to the output shaft of the second motor. The connecting shaft is rotatably connected to the mounting bracket. A drive gear is fixedly sleeved on the surface of the connecting shaft.

[0011] As a further preferred embodiment of this technical solution, a rotating shaft is rotatably connected to the middle of the mounting bracket, a threaded mandrel is fixedly connected to one end of the rotating shaft near the drive gear, and a transmission gear is fixedly sleeved on the surface of the rotating shaft, the transmission gear meshing with the drive gear.

[0012] As a further preferred embodiment of this technical solution, a connecting seat is fixedly connected to the side of the mounting bracket away from the cylinder, and a threaded sleeve is fixedly connected inside the connecting seat, and the threaded sleeve and the threaded mandrel are threadedly connected.

[0013] This utility model provides a core-pulling mechanism for internal threads in injection molds, which has the following beneficial effects:

[0014] (1) This utility model starts the motor, whose output shaft drives the convex plate to rotate. The convex plate rotates at a certain angle and lifts the lifting plate upward. The slide rod slides in the limiting plate, the connecting spring is squeezed and contracted, and the ejector pin slides in the fixed mold, thereby lifting the product upward. Furthermore, the elasticity of the connecting spring can slow down the upward movement speed of the ejector pin, thus avoiding damage to the product.

[0015] (2) This utility model starts the second motor, whose output shaft drives the connecting shaft to rotate, and the drive gear rotates accordingly. Since the transmission gear and the drive gear mesh, the transmission gear drives the rotating shaft and the threaded mandrel to rotate. Since the threaded mandrel and the threaded sleeve are matched, the threaded mandrel rotates inside the threaded sleeve while driving the rotating shaft to slide on the mounting bracket, thereby moving the threaded mandrel out of the fixed mold and realizing the demolding of the internal thread. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the structure of this utility model;

[0017] Figure 2 This is a schematic diagram of the cylinder and mounting bracket structure of this utility model;

[0018] Figure 3 This is a schematic diagram of the threaded mandrel and threaded sleeve structure of this utility model;

[0019] Figure 4 This is a schematic cross-sectional view of the mounting base of this utility model;

[0020] Figure 5 This is a schematic diagram of the mold and pad structure of this utility model.

[0021] In the diagram: 1. Base plate; 2. Support leg; 3. Mounting seat; 4. Fixed mold; 5. Ejector pin; 6. Pad plate; 7. Limiting plate; 8. Slide rod; 9. Connecting spring; 10. Lifting plate; 11. Motor base; 12. Motor 1; 13. Raised rib plate; 14. Guide groove; 15. Support plate; 16. Cylinder; 17. Mounting bracket; 18. Motor 2; 19. Connecting shaft; 20. Drive gear; 21. Rotating shaft; 22. Threaded mandrel; 23. Transmission gear; 24. Connecting seat; 25. Threaded sleeve. Detailed Implementation

[0022] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention.

[0023] This utility model provides a technical solution: such as Figures 1 to 5 As shown, in this embodiment, an internal thread core-pulling mechanism for injection molds includes a base plate 1. Support legs 2 are fixedly connected to the four top corners of the base plate 1. Mounting seats 3 are fixedly connected to the top of the support legs 2. A fixed mold 4 is fixedly connected to the top of the mounting seat 3. Multiple ejector pins 5 are slidably connected inside the fixed mold 4. A pad 6 is fixedly connected to the bottom of each ejector pin 5. A limiting plate 7 is provided at the bottom of the pad 6. The limiting plate 7 is fixedly connected to the bottom of the mounting seat 3. Two sliding rods 8 are symmetrically arranged at the bottom of the pad 6. The two sliding rods 8 are slidably connected to the limiting plate 7. A connecting spring 9 is movably sleeved on the surface of each sliding rod 8. A lifting plate 10 is fixedly connected to the bottom of each sliding rod 8.

[0024] When the motor 12 is started, its output shaft drives the convex plate 13 to rotate. The convex plate 13 rotates at a certain angle and lifts the lifting plate 10 upward. The slide rod 8 slides within the limiting plate 7, the connecting spring 9 is compressed and contracted, and the ejector pin 5 slides inside the fixed mold 4, thereby lifting the product upward. The elasticity of the connecting spring 9 can slow down the upward movement of the ejector pin 5 to avoid damage to the product. After the product is removed, the convex plate 13 continues to rotate, the connecting spring 9 rebounds, and drives the slide rod 8 and the lifting plate 10 downward, thereby returning the ejector pin 5 to its original position. A pressure sensor is installed on the limiting plate 7 to detect whether the pad 6 is in contact with the limiting plate 7, thereby ensuring that the ejector pin 5 is completely moved into the through hole of the fixed mold 4.

[0025] The bottom of the fixed mold 4 is provided with multiple through holes, the number of which is matched with the number of ejector pins 5. The ejector pins 5 pass through the through holes and extend into the interior of the mounting base 3. The connecting spring 9 is located between the limiting plate 7 and the lifting plate 10.

[0026] A motor base 11 is fixedly connected to the top of the base plate 1, a motor 12 is fixedly connected to the top of the motor base 11, and a convex rib plate 13 is fixedly sleeved on the output shaft of the motor 12. The convex rib plate 13 is in contact with the bottom of the lifting plate 10.

[0027] The top end of the mounting base 3 is provided with a guide groove 14, and a support plate 15 is fixedly connected to the side of the mounting base 3 near the guide groove 14. A cylinder 16 is fixedly connected to the top of the support plate 15.

[0028] When the cylinder 16 is activated, its output rod drives the mounting bracket 17 and the connecting seat 24 to rotate inside the guide groove 14, thereby completely removing the threaded mandrel 22 from the mold. The cylinder 16 can then return the threaded mandrel 22 to its original position. The guide groove 14 and the mounting bracket 17 are compatible, which can guide and limit the movement of the mounting bracket 17 and the connecting seat 24.

[0029] The guide groove 14 is internally slidably connected to a mounting bracket 17. The mounting bracket 17 is fixedly connected to the output rod of the cylinder 16. A motor 18 is fixedly connected to the side of the mounting bracket 17 near the cylinder 16. A connecting shaft 19 is fixedly connected to the output shaft of the motor 18. The connecting shaft 19 is rotatably connected to the mounting bracket 17. A drive gear 20 is fixedly sleeved on the surface of the connecting shaft 19.

[0030] A rotating shaft 21 is rotatably connected to the middle of the mounting bracket 17. A threaded spindle 22 is fixedly connected to one end of the rotating shaft 21 near the drive gear 20. A transmission gear 23 is fixedly sleeved on the surface of the rotating shaft 21, and the transmission gear 23 meshes with the drive gear 20.

[0031] A connecting seat 24 is fixedly connected to the side of the mounting bracket 17 away from the cylinder 16. A threaded sleeve 25 is fixedly connected inside the connecting seat 24. The threaded sleeve 25 and the threaded mandrel 22 are threadedly connected.

[0032] When core removal is required, motor 18 is started, and its output shaft drives the connecting shaft 19 to rotate. The drive gear 20 rotates accordingly. Since the transmission gear 23 and the drive gear 20 mesh, the transmission gear 23 drives the rotating shaft 21 and the threaded mandrel 22 to rotate. Since the threaded mandrel 22 and the threaded sleeve 25 are matched, the threaded mandrel 22 rotates inside the threaded sleeve 25 while driving the rotating shaft 21 to slide on the mounting bracket 17, thereby removing the threaded mandrel 22 from the fixed mold 4 and realizing the demolding of the internal thread. When reset is required, motor 18 is reversed, and the drive gear 20 rotates in the opposite direction. The threaded mandrel 22 rotates inside the threaded sleeve 25 under the drive of the transmission gear 23 and gradually returns to the initial position to facilitate core removal for subsequent product processing.

[0033] This utility model provides a core-pulling mechanism for internal threads in injection molds, the specific working principle of which is as follows:

[0034] In use, after the product is formed, start motor 18. Its output shaft drives the connecting shaft 19 to rotate, and the drive gear 20 rotates accordingly. Since the transmission gear 23 and the drive gear 20 mesh, the transmission gear 23 drives the rotating shaft 21 and the threaded mandrel 22 to rotate. Since the threaded mandrel 22 and the threaded sleeve 25 are compatible, the threaded mandrel 22 rotates inside the threaded sleeve 25 while driving the rotating shaft 21 to slide on the mounting bracket 17, thereby removing the threaded mandrel 22 from the fixed mold 4. Start cylinder 16. The mounting bracket 17 and the connecting seat 24 slide inside the guide groove 14, thereby completely detaching the threaded mandrel 22 from the fixed mold 4. Start motor 12. Its output shaft drives the convex plate 13 to rotate. The convex plate 13 rotates at a certain angle and lifts the lifting plate 10 upward. The slide rod 8 slides inside the limiting plate 7. The connecting spring 9 is compressed and contracted. The ejector pin 5 slides inside the fixed mold 4, thereby lifting the product upward, and the product can be taken out.

[0035] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. Threaded core-pulling mechanism in an injection mold comprising a base plate (1), characterized in that: The base plate (1) has four fixed feet (2) at the top corners. The top of the feet (2) is fixedly connected to the mounting base (3). The top of the mounting base (3) is fixedly connected to the fixed mold (4). The fixed mold (4) has multiple ejector pins (5) slidably connected inside. The bottom of the ejector pins (5) is fixedly connected to the pad (6). The bottom of the pad (6) is provided with a limit plate (7). The limit plate (7) is fixedly connected to the bottom of the mounting base (3). The bottom of the pad (6) is symmetrically provided with two slide rods (8). The two slide rods (8) and the limit plate (7) are slidably connected. The surface of the slide rod (8) is movably sleeved with a connecting spring (9). The bottom of the slide rod (8) is fixedly connected to a lifting plate (10).

2. An injection mold core pin mechanism according to claim 1 wherein: The bottom of the fixed mold (4) is provided with multiple through holes, the number of which is matched with the number of ejector pins (5). The ejector pins (5) pass through the through holes and extend into the interior of the mounting base (3). The connecting spring (9) is located between the limiting plate (7) and the lifting plate (10).

3. The core-pulling mechanism for internal threads of an injection mold according to claim 1, characterized in that: The top of the base plate (1) is fixedly connected to a motor base (11), the top of the motor base (11) is fixedly connected to a motor (12), the output shaft of the motor (12) is fixedly sleeved with a convex rib plate (13), and the convex rib plate (13) is in contact with the bottom of the lifting plate (10).

4. The core-pulling mechanism for internal threads of an injection mold according to claim 1, characterized in that: The top end of the mounting base (3) is provided with a guide groove (14), and a support plate (15) is fixedly connected to the side of the mounting base (3) near the guide groove (14). A cylinder (16) is fixedly connected to the top of the support plate (15).

5. The core-pulling mechanism for an internal thread of an injection mold according to claim 4, characterized in that: The guide groove (14) is slidably connected to a mounting bracket (17). The mounting bracket (17) is fixedly connected to the output rod of the cylinder (16). The mounting bracket (17) is fixedly connected to a second motor (18) on the side near the cylinder (16). The output shaft of the second motor (18) is fixedly connected to a connecting shaft (19). The connecting shaft (19) is rotatably connected to the mounting bracket (17). A drive gear (20) is fixedly sleeved on the surface of the connecting shaft (19).

6. The core-pulling mechanism for an internal thread of an injection mold according to claim 5, characterized in that: The mounting bracket (17) is rotatably connected to a rotating shaft (21) in the middle. A threaded spindle (22) is fixedly connected to one end of the rotating shaft (21) near the drive gear (20). A transmission gear (23) is fixedly sleeved on the surface of the rotating shaft (21). The transmission gear (23) meshes with the drive gear (20).

7. The core-pulling mechanism for internal threads of an injection mold according to claim 5, characterized in that: The mounting bracket (17) is fixedly connected to a connecting seat (24) on the side away from the cylinder (16). A threaded sleeve (25) is fixedly connected inside the connecting seat (24). The threaded sleeve (25) and the threaded mandrel (22) are threadedly connected.

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