Bush injection mold

Abstract

The utility model relates to the technical field of injection molds, in particular to a bushing injection mold which comprises a bottom plate, a top plate and four guide columns fixedly arranged between the bottom plate and the top plate, sliding seats capable of elastically resetting slide between the left and right opposite guide columns, a hydraulic cylinder arranged on the top plate is used for driving the two sliding seats to synchronously move downwards, and sliding grooves are formed in the opposite sides of the two sliding seats. Two movable dies capable of being elastically separated slide between the sliding grooves, the deviating sides of the movable dies are rotationally connected with rolling shafts, the top face of the bottom plate is provided with right-angle triangular blocks with the inclined faces facing the rolling shafts, and the rolling shafts are in rolling fit with the inclined faces of the triangular blocks. The two sliding seats are arranged between the two sliding seats in a sliding mode, the sliding seats move downwards to drive the two movable molds to be closed oppositely, the two movable molds are arranged on the bottom plate, semicircular cavities are formed in the opposite sides of the movable molds, a mold core matched with the cavities is arranged on the top face of the bottom plate, and a top ring is arranged on the periphery of the mold core in a sleeved mode and fixedly connected with the bottom faces of the corresponding sliding seats through symmetrically-welded connecting plates. And when the sliding seat elastically resets, the movable mold is elastically separated, so that the connecting plate is driven to drive the ejection ring to eject the molded bushing, and mold closing molding and automatic demolding of the bushing are realized.

Description

Technical Field

[0001] This utility model relates to the field of injection mold technology, specifically to a bushing injection mold. Background Technology

[0002] In the field of injection molding, bushing molds are the core tools for manufacturing ring-shaped or cylindrical plastic products. They are widely used in the automotive, machinery and electronics industries to produce key components such as bearing bushings and seals.

[0003] Existing bushing injection molds still have certain defects in practical applications. After injection molding, the bushing products tend to stick to the cavity wall of the fixed mold or the core of the moving mold, making demolding difficult and requiring manual removal. This process not only increases labor intensity but also causes damage or deformation to the bushing surface due to improper operation, reducing product yield. At the same time, frequent manual intervention slows down the production pace, forming an efficiency bottleneck and restricting the improvement of automated production levels. Utility Model Content

[0004] The purpose of this invention is to provide a bushing injection mold to solve the problems mentioned in the background.

[0005] To achieve the above objectives, this utility model provides the following technical solution: a bushing injection mold, comprising a base plate and a top plate, and four guide pillars fixed between the base plate and the top plate and arranged in a rectangular pattern. Each pair of left and right opposite guide pillars is slidably fitted with a slide block that can elastically return to its original position after moving downwards. A hydraulic cylinder is fixed to the top surface of the top plate to drive the two slide blocks to move downwards synchronously. Each of the two slide blocks has a groove on its opposite side. Two moving molds, which can elastically separate after closing, are slidably disposed between the two grooves. The opposite sides of the two moving molds are respectively... A longitudinally arranged roller is rotatably connected. Two right-angled triangular blocks with inclined surfaces facing the roller are fixed on the top surface of the base plate. The two rollers roll and engage with the inclined surfaces of the two right-angled triangular blocks respectively. A semi-circular cavity is opened on the opposite side of each of the two moving molds. A core is fixed on the top surface of the base plate, located between the two semi-circular cavities and whose outer contour matches the contour of the semi-circular cavity. A top ring located below the two moving molds is movably fitted around the outer periphery of the core. Connecting plates are symmetrically welded to the outer periphery of the top ring. The outer ends of the two connecting plates are respectively fixed to the bottom surface of the corresponding slide.

[0006] Preferably, the top surface of the base plate has an annular groove along the outer periphery of each guide post, and each annular groove is provided with a first spring that is movably sleeved on the outer periphery of the guide post. The end of the first spring away from the annular groove elastically abuts against the bottom surface of the slide.

[0007] Preferably, the piston shaft of the hydraulic cylinder movably passes through the top plate and is fixedly connected to a pressure plate located below the top plate. The pressure plate is slidably disposed on the four guide pillars, and four connecting sleeves are fixedly connected to the bottom surface of the pressure plate. Each connecting sleeve is movably disposed outside the corresponding guide pillar, and the bottom end of the connecting sleeve is fixedly connected to the top surface of the slide block.

[0008] Preferably, each of the two sliding blocks has a movable groove that connects to the sliding groove on one side opposite to each other. A light shaft abuts between the left and right sides of each movable groove. A second spring and a slider elastically abutting at both ends of the second spring are movably sleeved on the outer periphery of each light shaft. The free ends of the two sliders on each light shaft are respectively fixed on the corresponding moving mold.

[0009] Preferably, two bearing seats are fixed on opposite sides of the two moving molds, and each roller is rotatably connected between the corresponding two bearing seats.

[0010] Preferably, the top surface of the base plate is provided with a receiving groove, and the top ring and the two connecting plates can be accommodated in the receiving groove.

[0011] Preferably, one of the moving molds has an injection hole on its top surface that communicates with its own semi-circular cavity.

[0012] Preferably, both moving molds have cooling grooves on their bottom surfaces, which are located near their respective semi-circular cavities; cooling holes communicating with the cooling grooves are respectively provided on opposite sides of the two moving molds, and the cooling holes include water inlet holes and water outlet holes.

[0013] Compared with the prior art, this utility model provides a bushing injection mold with the following advantages: This utility model slides two moving molds between two slide blocks that can be elastically reset after moving downwards. When the slide blocks move downwards, they can drive the roller and the right-angled triangular block to push the moving molds to close towards each other. When the slide blocks elastically reset, the moving molds elastically separate, thereby driving the connecting plate to drive the top ring to eject the formed bushing, and finally realizing the bushing mold forming and automatic demolding. This solves the problems of manual demolding required in the existing bushing production, which easily damages the product, damages the mold, and is inefficient. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0015] Figure 2 This is a partial cross-sectional schematic diagram of the present invention;

[0016] Figure 3 This is a schematic diagram of the moving mold in this utility model;

[0017] Figure 4This is a full sectional view of the moving mold in this utility model.

[0018] In the diagram: 1. Base plate; 2. Top plate; 3. Guide pillar; 4. Slide block; 5. Hydraulic cylinder; 6. Slide groove; 7. Moving mold; 8. Roller; 9. Right-angled triangular block; 10. Semi-circular cavity; 11. Core; 12. Top ring; 13. Connecting plate; 14. Annular groove; 15. First spring; 16. Pressure plate; 17. Connecting sleeve; 18. Movable groove; 19. Optical axis; 20. Second spring; 21. Slider; 22. Bearing seat; 23. Receiving groove; 24. Injection hole; 25. Cooling groove; 26. Cooling hole. Detailed Implementation

[0019] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0020] Example: Please refer to Figures 1 to 4A bushing injection mold includes a base plate 1 and a top plate 2, and four guide pillars 3 fixed between the base plate 1 and the top plate 2 in a rectangular arrangement. A sliding block 4, which can elastically return to its original position after moving downwards, is slidably fitted between each pair of left and right opposite guide pillars 3. A hydraulic cylinder 5 is fixed on the top surface of the top plate 2 to drive the two sliding blocks 4 to move downwards synchronously. A groove 6 is opened on the opposite side of each of the two sliding blocks 4. Two moving molds 7, which can elastically separate after closing, are slidably fitted between the two grooves 6. A longitudinally arranged roller 8 is rotatably connected to the opposite side of each of the two moving molds 7. Two right-angled triangular blocks 9 with inclined surfaces facing the roller 8 are fixed on the top surface of the base plate 1. The two rollers 8 are respectively rolled in contact with the inclined surfaces of the two right-angled triangular blocks 9. A semi-circular cavity 10 is opened on the opposite side of each of the two moving molds 7. A semi-circular cavity 10 is fixed on the top surface of the base plate 1 between the two semi-circular cavities 10, with its outer contour aligned with the contour of the semi-circular cavity 10. A matching core 11 is provided, and a top ring 12 located below the two moving molds 7 is movably fitted around the outer periphery of the core 11. A connecting plate 13 is symmetrically welded around the outer periphery of the top ring 12. The outer ends of the two connecting plates 13 are respectively fixed to the bottom surface of the corresponding slide 4. Further, the slide 4 is driven to move down along the guide post 3 by the hydraulic cylinder 5, which drives the moving mold 7 to move down synchronously. During this period, the roller 8 rolls from the top to the bottom of the inclined plane of the right-angled triangular block 9, pushing the two moving molds 7 to close in opposite directions, so that the semi-circular cavity 10 and the core 11 surround and form the bushing molding cavity. After the mold closing and injection molding are completed, the hydraulic cylinder 5 is depressurized, the slide 4 elastically returns to its original position and rises, and the roller 8 rolls from the bottom to the top of the inclined plane of the right-angled triangular block 9, no longer generating opposing thrust on the moving mold 7. The moving mold 7 then elastically separates. At the same time, the slide 4 drives the top ring 12 and the connecting plate 13 to rise, pushing the molded bushing out of the core 11, realizing the molding and demolding of the bushing.

[0021] An annular groove 14 is formed on the top surface of the base plate 1 along the outer periphery of each guide post 3. A first spring 15 is movably sleeved on the outer periphery of the guide post 3 in each annular groove 14. The end of the first spring 15 away from the annular groove 14 elastically abuts against the bottom surface of the slide block 4. Furthermore, by setting the annular groove 14 and the first spring 15 on the outer periphery of the guide post 3, when the hydraulic cylinder 5 drives the slide block 4 to move downward, the slide block 4 squeezes the first spring 15 to compress and store force. After the hydraulic cylinder 5 is depressurized, the first spring 15 releases the stored force and elastically pushes the slide block 4 to move upward along the guide post 3, thereby realizing the elastic reset of the slide block 4.

[0022] The piston shaft of the hydraulic cylinder 5 moves through the top plate 2 and is fixedly connected to a pressure plate 16 located below the top plate 2. The pressure plate 16 is slidably mounted on four guide pillars 3, and four connecting sleeves 17 are fixedly connected to the bottom surface of the pressure plate 16. Each connecting sleeve 17 is movably mounted on the corresponding guide pillar 3, and the bottom end of the connecting sleeve 17 is fixedly connected to the top surface of the slide block 4. Furthermore, by setting the pressure plate 16 and the connecting sleeves 17, when the hydraulic cylinder 5 drives the piston shaft to move downward, the piston shaft drives the pressure plate 16 to move downward synchronously along the guide pillar 3. The pressure plate 16 then transmits the driving force to the two slide blocks 4 through the connecting sleeves 17, ensuring that the two slide blocks 4 are evenly stressed and move downward synchronously along the guide pillar 3, and avoiding the slide blocks 4 from shifting downward.

[0023] Two sliding blocks 4 each have a movable groove 18 on their opposite sides that connects to the sliding groove 6. Each movable groove 18 has a light shaft 19 between its left and right sides. Each light shaft 19 has a second spring 20 movably sleeved on its outer periphery and a slider 21 elastically abutting against both ends of the second spring 20. The free ends of the two sliders 21 on each light shaft 19 are fixed on the corresponding moving mold 7. Furthermore, by setting the movable groove 18, light shaft 19, second spring 20 and slider 21, when the mold is closed, the roller 8 rolls from the top to the bottom of the inclined plane of the right-angled triangle block 9, pushing the moving mold 7 to move towards each other. The moving mold 7 drives the slider 21 to slide along the light shaft 19 and squeeze the second spring 20. When the sliding block 4 rises and the roller 8 rolls from the bottom to the top of the inclined plane of the right-angled triangle block 9, the second spring 20 releases its stored force, pushing the slider 21 to slide in the opposite direction along the light shaft 19. The slider 21 then drives the two moving molds 7 to separate away from each other, thereby realizing the elastic separation of the moving mold 7.

[0024] Two bearing seats 22 are fixed on opposite sides of the two moving molds 7. Each roller 8 is rotatably connected between the corresponding two bearing seats 22. Furthermore, by fixing the bearing seats 22 on the side of the moving mold 7 and rotatably connecting the roller 8 between the two bearing seats 22, stable support is provided for the roller 8, ensuring that the roller 8 can rotate flexibly and without deviation when rolling along the inclined plane of the right-angled triangular block 9, thus ensuring smooth mold closing and separation of the moving mold 7.

[0025] The top surface of the base plate 1 is provided with a receiving groove 23, in which the top ring 12 and the two connecting plates 13 can be accommodated. Furthermore, by providing the receiving groove 23, when the slide block 4 presses down to drive the moving mold 7 to close, the slide block 4 simultaneously drives the top ring 12 and the connecting plates 13 to move downward. At this time, the top ring 12 and the connecting plates 13 can be completely accommodated in the receiving groove 23, avoiding interference between the two and the top surface of the base plate 1, ensuring that the slide block 4 can smoothly move down to the mold closing position and achieve stable mold closing.

[0026] One of the moving molds 7 has an injection hole 24 on its top surface that communicates with its own semi-circular cavity 10. Both moving molds 7 have cooling grooves 25 on their bottom surfaces, which are located close to their respective semi-circular cavities 10. On the opposite side of the two moving molds 7, there are cooling holes 26 that communicate with the cooling grooves 25. The cooling holes 26 include inlet holes and outlet holes. Furthermore, by setting the cooling grooves 25 and the inlet and outlet holes, during injection molding, the cooling water enters the cooling grooves 25 from the inlet hole, flows around the groove and absorbs the heat of the semi-circular cavity 10, and then exits from the outlet hole, so as to achieve rapid cooling of the moving molds 7, shorten the cooling time of the bushing molding, and reduce the adhesion between the bushing and the cavity, which facilitates subsequent demolding.

[0027] Working principle: First, the mold closing action is initiated, driven by the hydraulic cylinder 5 on the top surface of the top plate 2. The piston of the hydraulic cylinder 5 extends downward and drives the pressure plate 16 to move synchronously down along the four guide pillars 3. Since the bottom surface of the pressure plate 16 is fixed to the two slide blocks 4 one-to-one through the four connecting sleeves 17, the driving force is evenly transmitted to the two slide blocks 4 through the connecting sleeves 17, so that the slide blocks 4 slide steadily downward along the left and right opposite guide pillars 3. During this process, the slide blocks 4 squeeze the first spring 15 in the annular groove 14 on the outer periphery of the guide pillar 3. The first spring 15 contracts and stores force to prepare for subsequent reset. At the same time, the downward movement of the slide blocks 4 drives the moving mold 7 that cooperates with it. As the moving mold 7 moves downwards synchronously, the roller 8, which is rotatably connected to the bearing seat 22, also moves downwards synchronously. The roller 8 rolls from the top to the bottom of the inclined plane of the right-angled triangular block 9, generating a horizontal lateral thrust. This pushes the two moving molds 7 to move towards each other along the slide groove 6 of the slide block 4. When the moving mold 7 moves, it will drive the slider 21 on the optical shaft 19 in the movable groove 18 to slide synchronously, squeezing the second spring 20 between the sliders 21. The second spring 20 contracts and stores elastic potential energy until the two moving molds 7 are completely closed. At this time, the semi-circular cavity 10 inside the moving mold 7 and the core 11 on the top surface of the base plate 1 are precisely enclosed to form a complete bushing molding cavity. Simultaneously with mold closing, the slide block 4 drives the top ring 12 to move downwards synchronously via the connecting plate 13. The top ring 12 and the connecting plate 13 are completely accommodated in the receiving groove 23 of the bottom plate 1, avoiding interference with the bottom plate 1 and ensuring accurate and stable mold closing position. After the mold is closed, molten plastic is injected into the molding cavity through the injection hole 24 on the top surface of one of the moving molds 7. The cooling system is activated to cool down the mold. Cooling water enters from the water inlet on the side of the moving mold 7, flows through the cooling tank 25 located near the semi-circular cavity 10, and fully absorbs the heat of the moving mold 7 and the molding cavity during its circulation within the tank. It is then discharged from the water outlet, rapidly reducing the temperature of the molten plastic inside the cavity, shortening the molding and cooling time of the bushing, and reducing the adhesion between the bushing and the cavity wall, thus facilitating subsequent demolding. After the bushing molding and cooling are completed... Hydraulic cylinder 5 is depressurized, and the previously compressed first spring 15 releases its stored energy, elastically pushing slide 4 upward along guide post 3 to achieve elastic reset of slide 4. Slide 4 rises, driving moving mold 7 to move upward synchronously. Roller 8 then rolls from the bottom to the top of the inclined plane of right-angled triangular block 9, and the lateral thrust on moving mold 7 gradually disappears. At this time, the second spring 20 compressed in movable groove 18 releases its elastic potential energy, pushing slider 21 to slide in the opposite direction along optical axis 19. Slider 21 drives the two moving molds 7 to separate in opposite directions, completing the mold opening action. At the same time, during the rise of slide 4, the top ring 12 moves upward synchronously through connecting plate 13. The top ring 12 pushes the formed bushing upward along the outer periphery of core 11, smoothly removing the bushing from core 11, and finally achieving complete forming and demolding of bushing.

[0028] 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. A bushing injection mold comprising a base plate (1) and a top plate (2), and four guide posts (3) fixed between the base plate (1) and the top plate (2) and distributed in a rectangular shape, characterized in that: Each of the two guide posts (3) is slidably connected with a slide (4) which can be elastically reset after moving downward, the top surface of the top plate (2) is fixedly connected with a hydraulic cylinder (5) which drives the two slides (4) to move downward synchronously, the opposite side of each of the two slides (4) is provided with a sliding groove (6), the two sliding grooves (6) are slidably connected with two movable molds (7) which can be elastically separated after being closed, the side, away from each other, of the two movable molds (7) is respectively rotatably connected with a longitudinal roller (8), the top surface of the bottom plate (1) is fixedly connected with two right-angled triangular blocks (9) which are inclined towards the rollers (8), the two rollers (8) are respectively and slidably connected with the inclined surfaces of the two right-angled triangular blocks (9), the opposite side of the two movable molds (7) is respectively provided with a semicircular cavity (10), the top surface of the bottom plate (1) is fixedly connected with a core (11) which is located between the two semicircular cavities (10) and has an outer contour matching the semicircular cavities (10), the outer periphery of the core (11) is movably sleeved with a top ring (12) which is located below the two movable molds (7), the outer periphery of the top ring (12) is symmetrically welded with a connecting plate (13), the outer end of each of the two connecting plates (13) is fixedly connected to the bottom surface of the corresponding slide (4).

2. A bushing injection mold as defined in claim 1, wherein: The top surface of the bottom plate (1) is provided with an annular groove (14) along the outer periphery of each guide post (3), each annular groove (14) is provided with a first spring (15) which is movably sleeved on the outer periphery of the guide post (3), one end of the first spring (15), away from the annular groove (14), is elastically abutted against the bottom surface of the slide (4).

3. A bushing injection mold as defined in claim 1, wherein: The piston shaft of the hydraulic cylinder (5) is movably penetrated through the top plate (2) and fixedly connected with a pressing plate (16) which is located below the top plate (2), the pressing plate (16) is slidably arranged on the four guide posts (3), and the bottom surface of the pressing plate (16) is fixedly connected with four connecting sleeves (17), each connecting sleeve (17) is movably sleeved on the corresponding guide post (3), and the bottom end of the connecting sleeve (17) is fixedly connected with the top surface of the slide (4).

4. A bushing injection mold as defined in claim 1, wherein: The side, away from each other, of the two slides (4) is respectively provided with a movable slot (18) which is communicated with the sliding groove (6), each movable slot (18) is abutted with a light shaft (19) between the left and right sides, the outer periphery of each light shaft (19) is movably sleeved with a second spring (20) and a sliding block (21) which is elastically abutted against the two ends of the second spring (20), and the free end of each light shaft (19) is fixedly connected with the corresponding movable mold (7).

5. A bushing injection mold as defined in claim 1, wherein: The side, away from each other, of the two movable molds (7) is respectively fixedly connected with two bearing seats (22), and each roller (8) is rotatably connected between the corresponding two bearing seats (22).

6. A bushing injection mold as defined in claim 1, wherein: The top surface of the bottom plate (1) is provided with a receiving groove (23), and the top ring (12) and the two connecting plates (13) can be accommodated in the receiving groove (23).

7. A bushing injection mold as defined in claim 1, wherein: The top surface of one of the movable molds (7) is provided with an injection hole (24) which is communicated with the semicircular cavity (10) of the movable mold (7).

8. A bushing injection mold as defined in claim 1, wherein: The bottom surface of the two movable dies (7) is provided with cooling grooves (25) which are arranged close to the semicircular cavity (10); the side of the two movable dies (7) which faces away from each other is respectively provided with cooling holes (26) which are in communication with the cooling grooves (25), and the cooling holes (26) comprise water inlet holes and water outlet holes.

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