A rotary table ejection device and injection molding machine using the same

Abstract

The utility model relates to the technical fields of injection molding machine, specifically relates to a carousel ejection device and application the injection molding machine of device, including the connecting seat of sleeve connection in the outer side of the one end of pivot far from carousel, the connecting seat is through the limit rotating mechanism with pivot rotation connection, and limit rotating mechanism restricts the motion of connecting seat relative to pivot in the axial direction, the inner side of connecting seat relative to carousel is connected with middle plate through drive mechanism, drive mechanism is used for adjusting the position of middle plate relative to pivot in the axial direction, thereby adjusting the relative distance between middle plate and carousel. The utility model can satisfy that the carousel and middle plate have the clearance and reduce friction and loss when the carousel of injection molding machine rotates, can also satisfy that the carousel and middle plate have no clearance and prevent the carousel from tilting or spare and accessory from falling when the carousel is stationary.

Description

Technical Field

[0001] This utility model relates to the technical field of injection molding machines, specifically to a rotary ejector device and an injection molding machine using the device. Background Technology

[0002] The turntable and center platen are core components of an injection molding machine, respectively undertaking the crucial functions of mold parting and hydraulic support. The turntable is driven by gears or a transmission mechanism to achieve mold parting, as in two-color injection molding. The center platen, located at the center of the injection molding machine, connects the moving and stationary mold plates and is the core carrier of the hydraulic and control systems. During two-color injection molding, if there is no gap between the turntable and center platen, friction will occur as the turntable rotates, causing wear and tear on both, affecting product lifespan, and resulting in poor mold fit accuracy and low product yield. If there is a gap between the turntable and center platen, the turntable will tilt when stationary due to its own weight and the internal clearance of the bearings. Although existing technologies use copper plates on the center platen to address the problem of tearing, the risk of wear still exists. Therefore, adjusting the gap to solve the wear or tilting problems of the turntable and center platen is particularly important. Utility Model Content

[0003] To address the problems existing in the prior art, one objective of this invention is to provide a rotary table ejection device. By adjusting this device, the injection molding machine can achieve both a gap between the rotary table and the center plate to reduce friction and wear when the rotary table is rotating, and a zero gap between the rotary table and the center plate to prevent the rotary table from tilting or parts from falling off when the rotary table is stationary. A second objective of this invention is to provide an injection molding machine that, when combined with the aforementioned rotary table ejection device, makes the entire device more compact, ensures that each component performs its function effectively, reduces wear and tear and component loss, decreases maintenance time, and makes injection molding operations and rotary table operation more stable.

[0004] The present invention relates to a rotary ejection device and an injection molding machine using the device, comprising a connecting seat sleeved on the outer side of a rotating shaft away from the rotary disk. The connecting seat is rotatably connected to the rotating shaft via a limiting rotation mechanism, and the limiting rotation mechanism restricts the movement of the connecting seat relative to the rotating shaft in the axial direction. The connecting seat is connected to a middle plate on the inner side of the rotary disk via a driving mechanism. The driving mechanism is used to adjust the position of the middle plate relative to the rotating shaft in the axial direction, thereby adjusting the relative distance between the middle plate and the rotary disk.

[0005] In one embodiment, the limiting rotation mechanism includes a bearing housing fixedly connected to the rotating shaft and a first bearing embedded between the connecting seat and the bearing housing. The bearing housing is also provided with a locking nut for limiting the axial movement of the first bearing.

[0006] In one embodiment, the first bearing is a tapered roller bearing, and there are two first bearings arranged side by side along the axial direction.

[0007] In one embodiment, the number of drive mechanisms is two and they are arranged symmetrically on the connecting seat relative to the pivot axis.

[0008] In one embodiment, the drive mechanism includes a hydraulic cylinder, a piston rod, and a fixing nut. The hydraulic cylinder is fixed to the side of the middle plate near the connecting seat. The piston rod is connected to the hydraulic cylinder, and the movable end of the piston rod passes through the connecting seat and is fixedly connected to the connecting seat by the fixing nut.

[0009] In one embodiment, both ends of the cylinder are detachably connected covers, and the middle plate has a groove adapted to the cylinder, with a space between the bottom of the groove and the cylinder.

[0010] The injection molding machine of this utility model uses a rotary ejector device as described above, and the middle plate is rotatably connected to the rotating shaft through a second bearing, and bearing caps are respectively fixed on both sides of the middle plate.

[0011] In one embodiment, the second bearing includes two needle roller bearings and is respectively located near the two bearing caps, with an inner spacer and an outer spacer provided between the two needle roller bearings.

[0012] Compared with the prior art, the beneficial effects of this utility model's technical solution are:

[0013] 1. This utility model achieves an adjustable relative distance between the turntable and the middle plate by setting an ejection device between the middle plate and the rotating shaft. By using the limiting action of the drive mechanism and the limiting rotation mechanism, the rotating shaft can rotate relative to the middle plate while the turntable and the middle plate can have a gap or be completely in contact. In this way, when the turntable is rotating, the gap between the turntable and the middle plate can reduce friction and wear, and when the turntable is stationary, there is no gap between the turntable and the middle plate to prevent the turntable from tilting or parts from falling off.

[0014] 2. The injection molding machine of this utility model, especially the two-color injection molding machine, adopts the above-mentioned rotary table ejection device, which can ensure a compact structural fit on the basis of the original equipment, avoid direct wear between the rotary table and the middle plate, reduce the number of maintenance times and time, and make the injection operation and rotary table operation more stable. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the structure of a turntable ejection device according to this utility model;

[0016] Figure 2This is a schematic diagram of the structure of a rotary ejector device of this utility model applied to an injection molding machine.

[0017] Explanation of reference numerals in the attached drawings: 1-rotating shaft, 2-turntable, 3-middle plate, 4-connecting seat, 5-limiting rotation mechanism, 51-bearing seat, 52-first bearing, 53-locking nut, 6-drive mechanism, 61-oil cylinder, 62-piston rod, 63-fixing nut, 7-second bearing, 8-bearing cover, 9-inner spacer ring, 10-outer spacer ring. Detailed Implementation

[0018] The accompanying drawings are for illustrative purposes only and should not be construed as limiting the scope of this patent. To better illustrate this embodiment, some components in the drawings may be omitted, enlarged, or reduced, and do not represent the actual dimensions of the product. It is understandable to those skilled in the art that some well-known structures and their descriptions may be omitted in the drawings.

[0019] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation" and "connection" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can be described as the internal communication between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances. The technical solution of this utility model will be further described below with reference to the accompanying drawings and embodiments.

[0020] like Figure 1 and Figure 2 As shown, the present invention discloses a rotary ejection device and an injection molding machine using the device, including a connecting seat 4 sleeved on the outer side of the rotating shaft 1 away from the rotary disk 2. The connecting seat 4 is rotatably connected to the rotating shaft 1 through a limiting rotation mechanism 5, and the limiting rotation mechanism 5 restricts the movement of the connecting seat 4 relative to the rotating shaft 1 in the axial direction. The inner side of the connecting seat 4 relative to the rotary disk 2 is connected to the middle plate 3 through a driving mechanism 6. The driving mechanism 6 is used to adjust the position of the middle plate 3 relative to the rotating shaft 1 in the axial direction, thereby adjusting the relative distance between the middle plate 3 and the rotary disk 2. This invention utilizes an ejector device between the middle plate 3 and the rotating shaft 1 to achieve an adjustable relative distance between the turntable 2 and the middle plate 3. By employing the limiting action of the drive mechanism 6 in conjunction with the limiting rotation mechanism 5, the rotating shaft 1 can rotate relative to the middle plate 3, while the rotating shaft 1 and the turntable 2 can both shift left and right relative to the axial direction of the middle plate 3. This allows a gap to be created between the turntable 2 and the middle plate 3, or they can be completely pressed together. In this way, when the turntable 2 rotates, the gap between the turntable 2 and the middle plate 3 reduces friction and wear, while when the turntable 2 is stationary, there is no gap between the turntable 2 and the middle plate 3, preventing the turntable 2 from tilting or parts from falling off.

[0021] Specifically, the limiting rotation mechanism 5 includes a bearing seat 51 fixedly connected to the rotating shaft 1 and a first bearing 52 embedded between the connecting seat 4 and the bearing seat 51. The bearing seat 51 is also provided with a locking nut 53 for limiting the axial movement of the first bearing 52. In addition to enabling relative rotation between the connecting seat 4 and the bearing seat 51 through the first bearing 52, the limiting rotation mechanism 5 also provides a locking nut 53 at the end of the bearing seat 51, which is provided to the first bearing 52 in conjunction with the stepped structure on the side of the bearing seat 51. This restricts the left and right movement of the first bearing 52 in the axial direction. With the help of the driving mechanism 6, the connecting seat 4, the bearing seat 51, the rotating shaft 1 and the turntable 2 move together relative to the middle plate 3, thereby adjusting the gap between the turntable 2 and the middle plate 3. Furthermore, the first bearing 52 is a tapered roller bearing, and there are two first bearings 52 arranged side by side along the axial direction. The use of this double-row tapered roller bearing has the advantages of compact structure, strong load-bearing capacity, and separable inner and outer rings, which facilitates the disassembly and assembly of structures such as the limit rotation mechanism 5 and the connecting seat 4.

[0022] Specifically, there are two drive mechanisms 6, symmetrically arranged on the connecting seat 4 relative to the rotating shaft 1. The drive mechanisms 6 are generally adjusted and operated when the turntable 2 is stationary or just starting to rotate. Only the two symmetrically arranged structures are needed to push out the turntable 2, ensuring even force distribution. Furthermore, the drive mechanism 6 includes a hydraulic cylinder 61, a piston rod 62, and a fixing nut 63. The hydraulic cylinder 61 is fixed to the side of the middle plate 3 near the connecting seat 4. The piston rod 62 is connected to the hydraulic cylinder 61, and the movable end of the piston rod 62 passes through the connecting seat 4 and is fixedly connected to the connecting seat 4 by the fixing nut 63. Other hydraulic or electric devices can also be used for the drive mechanism 6. Here, the combination of the hydraulic cylinder 61 and the piston rod 62 is preferred. By fixing the hydraulic cylinder 61 to the middle plate 3 and the piston rod 62 to the connecting seat 4 by the fixing nut 63, the connecting seat 4 can be adjusted left and right relative to the middle plate 3. The power output of the hydraulic cylinder 61 is more stable, the load-bearing capacity is stronger, the wiring application is reduced, and interference with the rotating shaft drive of the injection molding machine itself is avoided.

[0023] Furthermore, both ends of the hydraulic cylinder 61 are detachable covers. The middle plate 3 has a groove adapted to the hydraulic cylinder 61, and there is space between the bottom of the groove and the hydraulic cylinder 61. The hydraulic cylinder 61 is a small, detachable structure. A groove is cut into the middle plate 3, and the stepped structure on the side of the hydraulic cylinder 61 is used to fit into the groove. The space at the bottom of the groove can be used to lay a buffer pad, etc., to avoid collision between the middle plate 3 and the turntable 2 during the driving process.

[0024] like Figure 2As shown, this utility model discloses an injection molding machine that utilizes a rotary ejector device as described above. The middle plate 3 is rotatably connected to the rotating shaft 1 via a second bearing 7, and bearing caps 8 are fixed to both sides of the middle plate 3. This utility model's injection molding machine, especially a two-color injection molding machine, employs the aforementioned rotary ejector device, ensuring a compact structural fit on the basis of the original equipment, avoiding direct wear between the rotary plate 2 and the middle plate 3, reducing maintenance frequency and time, and making the injection molding operation and rotary plate 2 operation more stable. The rotatable connection between the middle plate 3 and the rotating shaft 1 is specifically achieved through the second bearing 7, which is limited by the bearing caps 8 on the middle plate 3, further preventing the second bearing 7 from shifting into the gap when the rotary plate 2 is stationary. The second bearing 7 specifically includes two needle roller bearings, each positioned near the two bearing caps 8, with an inner spacer 9 and an outer spacer 10 between the two needle roller bearings. Needle roller bearings have a high load-bearing capacity and are suitable for support structures with limited radial mounting dimensions. The inner spacer 9 and outer spacer 10 support the two needle roller bearings in opposite positions, providing a certain support force, thereby reducing the tilting of turntable 2 and shaft 1 due to gravity.

[0025] In the description of this application, it should be understood that the orientation or positional relationship indicated by directional terms such as "front, back, up, down, left, right", "horizontal, vertical, horizontal" and "top, bottom" is usually based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing this application and simplifying the description. Unless otherwise stated, these directional terms do not indicate or imply that the device or element referred to must have a specific orientation or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on the scope of protection of this application.

[0026] The positional relationships described in the figures are for illustrative purposes only and should not be construed as limiting this patent. Clearly, the above embodiments of this utility model are merely examples to clearly illustrate the present utility model, and are not intended to limit the implementation of the present utility model. Those skilled in the art can make other variations or modifications based on the above description. It is neither necessary nor possible to exhaustively list all possible implementations here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this utility model should be included within the scope of protection of the claims of this utility model.

Claims

1. A rotary table ejection device, characterized in that, The device includes a connecting seat (4) sleeved on the outer side of the rotating shaft (1) away from the turntable (2). The connecting seat (4) is rotatably connected to the rotating shaft (1) through a limiting rotation mechanism (5), and the limiting rotation mechanism (5) restricts the movement of the connecting seat (4) relative to the rotating shaft (1) in the axial direction. The connecting seat (4) is connected to the middle plate (3) on the inner side of the turntable (2) through a driving mechanism (6). The driving mechanism (6) is used to adjust the position of the middle plate (3) relative to the rotating shaft (1) in the axial direction, thereby adjusting the relative distance between the middle plate (3) and the turntable (2).

2. The rotary table ejection device according to claim 1, characterized in that, The limiting rotation mechanism (5) includes a bearing seat (51) fixedly connected to the rotating shaft (1) and a first bearing (52) embedded between the connecting seat (4) and the bearing seat (51). The bearing seat (51) is also provided with a locking nut (53) for limiting the axial movement of the first bearing (52).

3. The turntable ejection device according to claim 2, characterized in that, The first bearing (52) is a tapered roller bearing, and there are two first bearings (52) arranged side by side along the axial direction.

4. The rotary table ejection device according to claim 1, characterized in that, The number of drive mechanisms (6) is two and they are arranged symmetrically on the connecting seat (4) relative to the rotating shaft (1).

5. The rotary table ejection device according to claim 4, characterized in that, The drive mechanism (6) includes a hydraulic cylinder (61), a piston rod (62), and a fixing nut (63). The hydraulic cylinder (61) is fixed on the side of the middle plate (3) near the connecting seat (4). The piston rod (62) is connected to the hydraulic cylinder (61), and the movable end of the piston rod (62) passes through the connecting seat (4) and is fixedly connected to the connecting seat (4) by the fixing nut (63).

6. The rotary table ejection device according to claim 5, characterized in that, The left and right ends of the oil cylinder (61) are detachable covers. The middle plate (3) has a groove that is compatible with the oil cylinder (61), and there is space between the bottom of the groove and the oil cylinder (61).

7. An injection molding machine, characterized in that, The injection molding machine uses a turntable ejection device as described in any one of claims 1-6, and the middle plate (3) is rotatably connected to the rotating shaft (1) through a second bearing (7), and bearing caps (8) are respectively fixed on both sides of the middle plate (3).

8. The injection molding machine according to claim 7, characterized in that, The second bearing (7) includes two needle roller bearings and is respectively located near the two bearing caps (8), with an inner spacer (9) and an outer spacer (10) between the two needle roller bearings.

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