Ejection device for an injection molding machine

Abstract

This utility model relates to the field of injection molding machine manufacturing and discloses an ejection device for an injection molding machine, including an ejection base, an ejection plate, and a screw drive assembly. The screw drive assembly includes a screw with both ends rotatably engaged with the moving platen and the ejection base, a nut fixed on the ejection plate and engaged with the screw, and a drive motor mounted on the ejection base for driving the screw to rotate. The drive motor and the screw are driven by a first pulley synchronization assembly. Several ejection rods that are inserted into the moving platen and used to eject material are fixed on the side of the ejection plate near the moving platen. Two sets of screw drive assemblies are provided, with the screw and drive motor arranged in a quadrilateral shape and the screws and drive motors arranged diagonally. The screws are synchronized by a second pulley synchronization assembly. This ejection device has high space utilization and low load requirements for a single motor, and is suitable for the ejection needs of large injection molding machines.

Description

Technical Field

[0001] This utility model relates to the field of injection molding machine manufacturing, and in particular to an ejection device for an injection molding machine. Background Technology

[0002] Two-plate mold clamping devices are generally equipped with hydraulic ejection devices. However, hydraulic ejection devices have low control precision and cannot meet the needs of some customers. Electric ejection devices, on the other hand, use lead screw pairs for transmission, which significantly improves control precision. Therefore, electric ejection devices are gradually replacing hydraulic ejection devices.

[0003] An electric ejector device is installed on a moving mold plate and an ejector base that is matched with the moving mold plate. The specific structure is disclosed in Chinese Patent No. CN221717725U, which discloses an electric injection molding machine ejector mechanism, including an ejector plate and a drive component that drives the ejector plate to move closer to or away from the moving mold. The ejector plate is guided and slidably moved in the space formed inside the moving mold plate (the space formed by the matching distance between the moving mold plate and the ejector base). The drive component includes a set of ball screw components. The screw nut in the ball screw component is fixed on the ejector plate. The two ends of the ball screw are rotatably set at the two ends of the space inside the moving mold plate. The space inside the moving mold plate is also provided with a guide rod parallel to the ball screw and used to guide the ejector plate. The rotation of the ball screw is controlled by a servo motor, which is installed on the moving mold plate.

[0004] This transmission structure, consisting of a single motor and a single lead screw, relies on a single lead screw to bear the entire ejection force, which inevitably fails to meet the ejection requirements of large two-plate mold clamping devices. On the other hand, the structure of a double lead screw, a single motor, and a synchronous belt would lead to problems such as excessive motor load, low motor transmission efficiency, large motor size, and insufficient installation space. Utility Model Content

[0005] This invention addresses the shortcomings of large two-platen mold clamping devices, such as excessive motor load, low transmission efficiency, and insufficient installation space, which are caused by using a single lead screw and single motor or a double lead screw and single motor. It provides an ejection device for injection molding machines that has high space utilization and reduces the load requirement of a single motor.

[0006] To solve the above-mentioned technical problems, the present invention provides a solution through the following technical method: An ejection device for an injection molding machine includes an ejection base that is spaced with a moving template, an ejection plate that moves between the moving template and the ejection base, and a screw drive assembly for driving the ejection plate. The screw drive assembly includes a screw with both ends rotatably engaged with the moving template and the ejection base, a nut fixed on the ejection plate and engaged with the screw, and a drive motor mounted on the ejection base for driving the screw to rotate. The drive motor and the screw are driven by a first pulley synchronization assembly. Several ejection rods that are inserted into the moving template and used to eject material are fixed on the side of the ejection plate near the moving template. Two sets of screw drive assemblies are provided, with the screw and drive motor arranged in a quadrilateral shape and the screws and drive motors arranged diagonally. The screws are synchronized by a second pulley synchronization assembly.

[0007] By adopting the above scheme, two sets of lead screw transmission components are set up. Each set of lead screws is rotated by a drive motor under the first pulley synchronization component. The two sets of lead screws are synchronized by a second pulley synchronization component, which can reduce the load requirements of each drive motor. The lead screws and drive motors are diagonally distributed, resulting in a very compact structure that can reduce the installation volume of the ejection base. The above configuration can improve the space utilization of the installation and reduce the load requirements of a single motor, making it suitable for the ejection requirements of large injection molding machines.

[0008] Preferably, the first pulley synchronization assembly includes a first synchronous pulley coaxially fixed on the motor shaft of the drive motor, a second synchronous pulley coaxially fixed on the lead screw at the end of the ejector base away from the moving template, and a first synchronous belt that is fitted between the first and second synchronous pulleys; the second pulley synchronization assembly includes a third synchronous pulley coaxially fixed on the lead screw on the side of the second synchronous pulley away from the ejector base, and a second synchronous belt that is fitted between adjacent third synchronous pulleys.

[0009] With the above scheme, since the two sets of lead screws are diagonally distributed, the second synchronous belt, after assembly, is arranged in a "Z" shape or a "Z" shape mirror image of the two first synchronous belts. The layout is reasonable and can effectively shorten the setting length of the first and second synchronous belts.

[0010] Preferably, a tensioning assembly for tensioning the second synchronous belt is provided on the ejector base.

[0011] Preferably, the tensioning assembly includes a fixed seat fixed to the ejector base, an adjusting seat that can be guided and slid relative to the fixed seat and limited, and a tensioning wheel rotatably disposed on the adjusting seat. A drive assembly is provided between the adjusting seat and the fixed seat to drive the adjusting seat to move and tension the second synchronous belt when the adjusting seat and the fixed seat are released from the limitation.

[0012] Using the above scheme, after the adjusting seat and the fixed seat are released from their limits, the position of the adjusting seat can be changed through the drive component, thereby achieving the tensioning of the tensioning wheel on the second synchronous belt.

[0013] Preferably, the adjusting seat has a parallel waist-shaped guide groove, the fixed seat has a threaded groove, and a clamping bolt is screwed into the threaded groove. The clamping bolt is inserted into the waist-shaped guide groove and can be rotated to disengage from the adjusting seat or have its head abut against the adjusting seat.

[0014] Using the above scheme, the clamping bolt engages with the threaded groove while its head engages with the distance between the adjusting seat and the adjusting seat. At this time, the clamping bolt can restrict the adjusting seat from coming off the fixed seat and guide the adjusting seat to move relative to the fixed seat. When the head of the clamping bolt abuts against the adjusting seat, the adjusting seat and the fixed seat are limited.

[0015] Preferably, the drive assembly includes an adjustment block that is vertically folded at the end of the adjustment seat and parallel to the side wall of the fixed seat, an adjustment bolt that is screwed onto the adjustment block and abuts against the side wall of the fixed seat, and a lock nut that is screwed onto the adjustment bolt.

[0016] Using the above method, after the adjusting seat and the fixed seat are released from the limit, first rotate the locking nut to leave a gap that exceeds the adjustment distance of the adjusting bolt, then rotate the adjusting bolt until the adjusting seat moves to the tensioning wheel to tension the second synchronous belt, and then rotate the locking nut in the opposite direction to lock it.

[0017] Preferably, an electromagnetic brake is provided on the drive motor, which is coaxially arranged with the motor shaft and used to brake the rotation of the motor shaft.

[0018] By adopting the above scheme, the electromagnetic brake can engage in braking when the drive motor fails, preventing the danger of runaway.

[0019] Preferably, the outer edge of the ejector base is provided with several weight-reducing grooves, and the ejector base is in the shape of an inclined "cross".

[0020] By adopting the above solution, the amount of material used for the ejector base is reduced, thus lowering costs.

[0021] Preferably, the ejector base is detachably fixed to the moving template by two connecting frames, and the ejector base and the connecting frames are detachably fixedly connected.

[0022] The above-mentioned solution allows for easy disassembly, assembly, and maintenance of the detachable structure.

[0023] Preferably, a soundproof cover is detachably fixed to the ejector base, covering all components on the side of the ejector base away from the moving template.

[0024] By adopting the above solution, the soundproof enclosure can reduce transmission noise.

[0025] This utility model, by adopting the above technical solution, has significant technical effects: it sets up two sets of lead screw transmission components, each set of lead screws is driven by a drive motor and rotates under a set of first pulley synchronization components, and the two sets of lead screws are synchronized by a second pulley synchronization component, which can reduce the load requirements of each drive motor; the lead screws and drive motors are diagonally distributed, the structure is very compact, which can reduce the installation volume of the ejection base and shorten the installation length of the first and second synchronization belts. The above configuration can improve the space utilization of the installation and reduce the load requirements of a single motor, which is suitable for the ejection requirements of large injection molding machines. Attached Figure Description

[0026] Figure 1 This is an isometric view of an ejection device for an injection molding machine according to this embodiment; Figure 2 This is an isometric view of the ejector device in this embodiment when the two lead screws are not synchronized; Figure 3 This is an isometric view of the ejector device in this embodiment after the soundproof cover has been removed; Figure 4 This is a front view of the ejector device in this embodiment after the soundproof cover has been removed; Figure 5 This is a partial isometric view of the tensioning assembly in this embodiment tensioning the second synchronous belt. Figure 1 ; Figure 6 This is a partial isometric view of the tensioning assembly in this embodiment tensioning the second synchronous belt. Figure 2 ; Figure 7 This is a partial isometric view of the ejection device in this embodiment.

[0027] The parts referred to by the numbers in the above attached diagrams are as follows: 1. Moving template; 2. Ejector plate; 3. Ejector base; 301. Weight reduction groove; 4. Connecting frame; 5. Soundproof cover; 6. Mounting plate; 7. Drive motor; 8. First synchronous pulley; 9. Second synchronous pulley; 10. First synchronous belt; 11. Guide rod; 12. Third synchronous pulley; 13. Second synchronous belt; 14. Tensioning pulley; 15. Electromagnetic brake; 16. Fixed seat; 17. Adjusting seat; 18. Adjusting block; 19. Auxiliary push rod; 20. Screw rod; 21. Nut; 22. Center push rod; 23. Locking nut; 24. Pressure bolt; 25. Waist-shaped guide groove; 26. Adjusting bolt. Detailed Implementation

[0028] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments.

[0029] An ejector device for an injection molding machine, as described above. Figures 1-7As shown, the assembly includes an ejector base 3, an ejector plate 2, and a lead screw drive assembly. The ejector base 3 is detachably fixed to the moving template 1 on each side via a connecting frame 4. The ejector base 3 and the connecting frame 4, as well as the moving template 1 and the connecting frame 4, are detachably fixed together by bolts. Two parallel guide rods 11 are fixedly installed between the ejector base 3 and the moving template 1. Guide holes for the guide rods 11 to pass through are provided on both sides of the ejector plate 2. The ejector plate 2 slides between the ejector base 3 and the moving template 1 guided by the guide rods 11. Several ejector rods are fixed to the side of the ejector plate 2 closest to the moving template 1, which are inserted into the moving template 1 and used to eject material. The ejector rods include a central ejector rod 22 located at the center of the ejector plate 2 and auxiliary ejector rods 19 distributed around the central ejector rod 22. Both the central ejector rod 22 and the auxiliary ejector rods 19 are inserted into the moving template 1 and can penetrate the moving template 1 to achieve ejection.

[0030] Two sets of lead screw transmission assemblies are provided to drive the movement of the ejector plate 2. Each set of lead screw transmission assemblies includes a lead screw 20 with both ends rotatably engaged with the moving template 1 and the ejector base 3, a nut 21 fixed on the ejector plate 2 and engaged with the lead screw 20, and a drive motor 7 mounted on the ejector base 3 to drive the lead screw 20 to rotate. The drive motor 7 is a servo motor. The drive motor 7 and the lead screw 20 are transmitted through a first pulley synchronization assembly. The lead screw 20 and the drive motor 7 are arranged in a quadrilateral shape, and the lead screw 20 and the drive motor 7 are diagonally distributed. The lead screw 20 are synchronized through a second pulley synchronization assembly.

[0031] The first pulley synchronization assembly includes a first synchronization pulley 8 coaxially fixed on the motor shaft of the drive motor 7, a second synchronization pulley 9 coaxially fixed on the end of the lead screw 20 away from the moving template 1 of the ejector base 3, and a first synchronization belt 10 that is configured to cooperate between the first synchronization pulley 8 and the second synchronization pulley 9; the second pulley synchronization assembly includes a third synchronization pulley 12 coaxially fixed on the side of the lead screw 20 away from the ejector base 3 of the second synchronization pulley 9, and a second synchronization belt 13 that is configured to cooperate between adjacent third synchronization pulleys 12.

[0032] A tensioning assembly for tensioning the second synchronous belt 13 is provided on the ejector base 3. The tensioning assembly includes a fixed base 16 fixed on the ejector base 3, an adjusting base 17 that can be guided and slid relative to the fixed base 16 and limited, and a tensioning wheel 14 rotatably provided on the adjusting base 17. Two sets of waist-shaped guide grooves 25 are provided parallel on both sides of the tensioning wheel 14 on the adjusting base 17. The fixed base 16 is provided with a threaded groove, and a clamping bolt 24 is screwed into the threaded groove. The clamping bolt 24 is inserted into the waist-shaped guide groove 25 and can be rotated to disengage from the adjusting base 17 or have its head abut against the adjusting base 17.

[0033] A drive assembly is provided between the adjusting seat 17 and the fixed seat 16 to drive the adjusting seat 17 to move and tension the second synchronous belt 13 when the adjusting seat 17 and the fixed seat 16 are released from their limiting positions. The drive assembly includes an adjusting block 18 that is vertically folded at the end of the adjusting seat 17 and parallel to the side wall of the fixed seat 16, an adjusting bolt 26 that is screwed onto the adjusting block 18 and abuts against the side wall of the fixed seat 16, and a locking nut 23 that is screwed onto the adjusting bolt 26.

[0034] The outer edge of the ejector base 3 is provided with several weight-reducing grooves 301. The ejector base 3 is in the shape of an inclined "cross". This design can reduce the amount of material used and lower the cost.

[0035] To save installation space, the ejector base 3 is provided with a clearance groove for the drive motor 7 to pass through. At the end of the ejector base 3 away from the ejector plate 2, a mounting plate 6 for fixing the drive motor 7 is detachably fixed by bolts. An electromagnetic brake 15 is provided on the drive motor 7, which is coaxially arranged with the motor shaft of the drive motor 7 and is used to brake the rotation of the motor shaft.

[0036] A soundproof cover 5, which covers all components on the side of the ejector base 3 away from the moving template 1, can also be detachably fixed to the ejector base 3 by bolts. This setting is used to significantly reduce transmission noise.

[0037] The design of this ejection device features two sets of lead screw transmission components. Each set of lead screws 20 rotates via a drive motor 7 under the synchronization of a first pulley assembly. The two sets of lead screws 20 are synchronized via a second pulley synchronization assembly, which reduces the load requirement of each drive motor 7. The lead screws 20 and the drive motors 7 are diagonally distributed, resulting in a very compact structure that reduces the size of the ejection base 3 and shortens the length of the first and second synchronous belts 10 and 13. A tensioning assembly is added, which, by adjusting the tensioning assembly, improves the synchronization of the rotation of the two sets of lead screws 20. The above configuration improves the space utilization of the ejection device and reduces the load requirement of a single motor, making it suitable for the ejection needs of large injection molding machines.

[0038] The above description is merely a preferred embodiment of this utility model. The protection scope of this utility model is not limited to the above embodiments. All technical solutions falling within the scope of this utility model's concept are protected. It should be noted that for those skilled in the art, any improvements and modifications made without departing from the principle of this utility model should also be considered within the protection scope of this utility model.

Claims

1. An ejection device for an injection molding machine, comprising an ejection base (3) that is spaced to a moving template (1), an ejection plate (2) that moves between the moving template (1) and the ejection base (3), and a screw drive assembly for driving the ejection plate (2) to move. The screw drive assembly comprises a screw (20) whose two ends are rotatably engaged with the moving template (1) and the ejection base (3), a nut (21) fixed on the ejection plate (2) and engaged with the screw (20), and a drive motor (7) mounted on the ejection base (3) for driving the screw (20) to rotate. The drive motor (7) and the screw (20) are driven by a first pulley synchronization assembly. A plurality of ejector rods that are inserted into the moving template (1) and used to eject material are fixed on the side of the ejection plate (2) near the moving template (1). The lead screw pair transmission assembly is provided in two sets. The lead screw (20) and the drive motor (7) are arranged in a quadrilateral shape, and the lead screw (20) and the drive motor (7) are arranged diagonally. The lead screw (20) are synchronized through the second pulley synchronization assembly.

2. The ejector device for an injection molding machine according to claim 1, characterized in that: The first pulley synchronization assembly includes a first synchronization pulley (8) coaxially fixed on the motor shaft of the drive motor (7), a second synchronization pulley (9) coaxially fixed on the end of the lead screw (20) away from the moving template (1) of the ejector base (3), and a first synchronization belt (10) that is fitted between the first synchronization pulley (8) and the second synchronization pulley (9); the second pulley synchronization assembly includes a third synchronization pulley (12) coaxially fixed on the side of the lead screw (20) away from the ejector base (3) of the second synchronization pulley (9), and a second synchronization belt (13) that is fitted between adjacent third synchronization pulleys (12).

3. An ejector device for an injection molding machine according to claim 2, characterized in that: A tensioning assembly for tensioning the second synchronous belt (13) is provided on the ejector base (3).

4. An ejector device for an injection molding machine according to claim 3, characterized in that: The tensioning assembly includes a fixed seat (16) fixed on the ejector base (3), an adjusting seat (17) that can be guided and slid relative to the fixed seat (16) and limited, and a tensioning wheel (14) rotatably disposed on the adjusting seat (17). A drive assembly is provided between the adjusting seat (17) and the fixed seat (16) to drive the adjusting seat (17) to move and tension the second synchronous belt (13) when the adjusting seat (17) is released from the limitation of the fixed seat (16).

5. An ejector device for an injection molding machine according to claim 4, characterized in that: The adjusting seat (17) has a parallel waist-shaped guide groove (25), and the fixed seat (16) has a threaded groove. A clamping bolt (24) is screwed onto the threaded groove. The clamping bolt (24) is inserted into the waist-shaped guide groove (25) and can be rotated to disengage from the adjusting seat (17) or its head abuts against the adjusting seat (17).

6. An ejector device for an injection molding machine according to claim 5, characterized in that: The drive assembly includes an adjustment block (18) that is vertically folded at the end of the adjustment seat (17) and parallel to the side wall of the fixed seat (16), an adjustment bolt (26) that is screwed onto the adjustment block (18) and abuts against the side wall of the fixed seat (16), and a lock nut (23) that is screwed onto the adjustment bolt (26).

7. An ejector device for an injection molding machine according to claim 2, characterized in that: An electromagnetic brake (15) is provided on the drive motor (7) and is coaxially arranged with the motor shaft and used to brake the rotation of the motor shaft.

8. An ejector device for an injection molding machine according to claim 1, characterized in that: The outer edge of the ejector base (3) is provided with several weight-reducing grooves (301), and the ejector base (3) is in the shape of an inclined "cross".

9. An ejector device for an injection molding machine according to any one of claims 1-8, characterized in that: The ejector base (3) is detachably fixed to the moving template (1) via two connecting frames (4), and the ejector base (3) and the connecting frames (4) are detachably fixedly connected.

10. An ejector device for an injection molding machine according to claim 9, characterized in that: A soundproof cover (5) is detachably fixed on the ejector base (3) to cover all components on the side of the ejector base (3) away from the moving template (1).

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