Rotating shaft elastic limiting structure and rotating disc type injection molding machine

Abstract

The invention relates to the field of injection molding machines, and discloses a rotating shaft elastic limiting structure and a rotating disc type injection molding machine. The rotating shaft elastic limiting structure comprises a template, a rotating disc arranged at one end of the template and needle bearings arranged at the two ends of the template respectively; the template is provided with a rotating shaft fixed with the turntable, a movable plate which is fixedly arranged on the rotating shaft and can move along with the rotating shaft, and extrusion plates which are respectively arranged on two sides of the movable plate and can be driven by the hand movable plate; the fixed plate is arranged on the side, away from the movable plate, of the extrusion plate and used for limiting the displacement amount of the extrusion plate, the reset component is arranged between the movable plate and the fixed plate which are opposite to each other and used for driving the movable plate to move away from the fixed plate, and the reset component can push the rotating shaft to reset when the rotating shaft moves due to axial movement. Therefore, the turntable which is displaced due to the axial movement of the rotating shaft is far away from the template, an avoiding space is provided for the next axial movement of the rotating shaft, and the probability that the turntable is damaged due to mutual friction with the template is reduced.

Description

Technical Field

[0001] The present invention relates to the field of injection molding machines, and particularly to a shaft elastic limit structure and a rotary table type injection molding machine. Background Art

[0002] In a rotary table type injection molding machine, the rotary table and the rotating shaft are fixed by screws and cooperate with the template through bearings. Since a large radial load will be generated when the rotary table type injection molding machine is in use, when selecting bearings, needle roller bearings with larger radial load capacity are usually selected. The inner ring of the needle roller bearing is fixedly arranged on the rotating shaft, and the outer ring is fixedly arranged on the template. When the rotary table rotates, since the needle roller bearing is a separable structure of the inner and outer rings, the rotating shaft and the inner ring of the needle roller bearing fixed to the rotating shaft may displace relative to the outer ring of the needle roller bearing due to axial movement. Since the rotary table is fixed on the rotating shaft, when the rotating shaft displaces, the rotary table will also displace, resulting in friction and damage between the rotary table and the template. Summary of the Invention

[0003] Aiming at the shortcomings of the prior art that when the rotary table drives the rotating shaft to rotate, the rotating shaft will have axial movement, resulting in mutual wear between the position of the rotary table thereon and the template and thus damage, the present invention provides a shaft elastic limit structure and a rotary table type injection molding machine that can reduce the probability of damage when the rotary table rotates.

[0004] To solve the above technical problems, the present invention is solved by the following technical solutions:

[0005] A shaft elastic limit structure includes a rotating shaft, and a limit structure for controlling the displacement amount of the axial movement of the rotating shaft is arranged at one end of the rotating shaft. The limit structure includes a moving plate fixedly arranged on the rotating shaft and capable of moving together with the rotating shaft during axial movement. On both sides of the moving plate, pressing plates that can be driven by the moving plate are respectively arranged. On the side of the two pressing plates away from the moving plate, fixing plates for limiting the displacement amount of the pressing plates are arranged. A reset component for driving the moving plate to move away from the fixing plate is arranged between the moving plate and the fixing plate facing each other.

[0006] With the above solution, the moving plate connected to the rotating shaft can move together when the rotating shaft has axial movement. When the moving plate displaces, the moving plate will apply pressure to the pressing plate to drive the pressing plate to move. When the rotating shaft stops rotating, at this time, the reset component will push the moving plate and the pressing plate to move away from the fixing plate, so as to realize the reset of the moving plate and the pressing plate. Since the moving plate is fixed to the rotating shaft, when the moving plate retracts, it will drive the rotating shaft to reset, thereby providing a moving space for the subsequent axial movement of the rotating shaft and simultaneously controlling the displacement range of the axial movement of the rotating shaft.

[0007] Preferably, the reset component includes a plurality of springs circumferentially arranged between the fixing plate and the moving plate, and both ends of the springs are respectively abutted against the two.

[0008] With the above solution, when the axial movement of the rotating shaft occurs due to rotation, the rotating shaft will drive the pressing plate to move through the moving plate and compress the spring. When the rotating shaft stops rotating, the spring arranged between the fixed plate and the moving plate will push the moving plate back to its original position, providing a displacement space for the subsequent axial movement of the rotating shaft and simultaneously controlling the displacement range of the axial movement of the rotating shaft.

[0009] Preferably, a guiding member for guiding the movement of the pressing plate and the moving plate is arranged between the two fixed plates.

[0010] Preferably, the guiding member includes guiding columns arranged between the two fixed plates, and both ends of the guiding columns respectively penetrate outside the corresponding pressing plates.

[0011] With the above solution, the guiding columns arranged between the two fixed plates can guide the movement of the pressing plate and the moving plate, making the movement of the pressing plate and the moving plate more stable.

[0012] Preferably, a position limiting member for driving the pressing plate and the moving plate to always return to the initial position under the action of the spring is arranged on the guiding column between the two pressing plates.

[0013] Preferably, the position limiting member includes a limiting section with a diameter larger than that of the guiding column arranged on the guiding column between the two pressing plates.

[0014] With the above solution, the limiting section with a diameter larger than that of the guiding column arranged on the guiding column, the side walls at both ends thereof can abut against the side wall of the pressing plate when the moving plate and the pressing plate are pushed back by the spring force, thereby limiting the position when the pressing plate and the moving plate are pushed back, and making the moving plate and the pressing plate always in the initial position after being pushed back.

[0015] Preferably, the spring is sleeved on the guiding column.

[0016] With the above solution, sleeving the spring on the guiding column can reduce the probability of the spring arranged between the fixed plate and the pressing plate detaching from between the two.

[0017] Preferably, a gasket is respectively arranged at one end of the two pressing plates close to the moving plate.

[0018] Preferably, a rotary injection molding machine includes a template, a turntable arranged at one end of the template, and needle roller bearings coaxially arranged at both ends of the template. The middle part of the template is provided with the above-mentioned rotating shaft elastic limiting structure, and the two fixed plates are fixedly arranged on the side of the template far from the turntable through bolts, and the turntable is fixedly arranged at one end of the rotating shaft extending outside the template.

[0019] With the above solution, since the turntable is fixedly arranged on the rotating shaft, when the rotating shaft moves due to axial end play, the turntable will also move accordingly. At this time, the turntable will gradually approach the side wall of the template. When the rotating shaft stops rotating, the spring will push the rotating shaft to reset, and at this time, the turntable will also move away from the template along with the rotating shaft, enabling the turntable to move within a certain range. The operator only needs to adjust the gap between the turntable and the template during installation to reduce the probability of damage to the turntable caused by mutual friction with the template.

[0020] Due to the adoption of the above technical solution, the present invention has remarkable technical effects: the moving plate connected to the rotating shaft can move together when the rotating shaft has axial end play. When the moving plate moves, the moving plate will exert pressure on the pressing plate to drive the pressing plate to move. When the rotating shaft stops rotating, at this time, the reset component will push the moving plate and the pressing plate to move away from the fixed plate, thereby realizing the reset of the moving plate and the pressing plate. Since the moving plate is fixed to the rotating shaft, when the moving plate retracts, it will drive the rotating shaft to reset, thus providing a moving space for subsequent axial end play of the rotating shaft and simultaneously controlling the displacement range of the axial end play of the rotating shaft. Brief Description of the Drawings

[0021] Figure 1 is an axonometric view of a rotating shaft elastic limit structure and a rotary injection molding machine in this embodiment;

[0022] Figure 2 is Figure 1 an enlarged view of part A in

[0023] Figure 3 is a sectional view of a rotating shaft elastic limit structure and a rotary injection molding machine in this embodiment;

[0024] Figure 4 is Figure 3 an enlarged view of part B in

[0025] Figure 5 is an axonometric view of the rotating shaft and the rotating shaft elastic limit structure in this embodiment;

[0026] Figure 6 is an exploded view of the rotating shaft elastic limit structure in this embodiment.

[0027] The names of the parts referred to by each digital label in the above drawings are as follows: 1, template; 2, rotating shaft; 3, turntable; 4, needle roller bearing; 5, moving plate; 501, washer; 502, wear-resistant sheet; 6, pressing plate; 7, fixed plate; 8, bolt; 9, guide post; 10, limiting section; 11, spring; 12, gasket. Detailed Description of the Embodiment

[0028] The present invention will be further described in detail below in conjunction with the drawings and embodiments.

[0029] Embodiment

[0030] A shaft elastic limit structure and a rotary injection molding machine. Refer to Figures 1-4 , including a template 1, a turntable 3 arranged at one end of the template 1, and needle roller bearings 4 arranged at both ends of the template 1 respectively. An elastic limit structure for the shaft 2 is arranged in the middle of the template 1. The elastic limit structure for the shaft 2 includes a shaft 2 and a limit structure for controlling the displacement of the shaft 2 at one end of the shaft 2. The limit structure includes a moving plate 5 fixedly arranged at one end of the shaft 2, pressing plates 6 arranged on both sides of the moving plate 5 respectively, fixing plates 7 arranged at the ends of the two pressing plates 6 away from the moving plate 5 for limiting the displacement of the moving plate 5 and the pressing plates 6, and a reset component for driving the pressing plates 6 and the moving plate 5 to reset. The turntable 3 is fixedly arranged at the position where the shaft 2 extends out of the template 1. A gasket 12 is arranged at one end of each of the two pressing plates 6 close to the moving plate 5. In this embodiment, the moving plate 5 is composed of a washer 501 fixed to the shaft 2 and a wear-resistant piece 502 fixed to the washer 501. The outer ring of the needle roller bearing 4 is fixed to the template 1, and the inner ring is fixed to the shaft 2. When the turntable 3 is installed on the shaft 2, a certain gap can be left between the turntable 3 and the template 1 for the shaft 2 to displace when axially moving, so as to further reduce the probability of the turntable 3 being worn due to the axial movement of the shaft 2.

[0031] Refer to Figures 3-6 , the reset component includes a plurality of springs 11 circumferentially arranged between the fixing plate 7 and the moving plate 5. The two ends of the springs 11 are respectively abutted against the two. A position limiting component for driving the pressing plates 6 and the moving plate 5 to always reset to the initial position under the action of the springs 11 is arranged between the two pressing plates 6. The position limiting component includes a limiting section 10 arranged on the side walls at both ends between the two pressing plates 6, which can be abutted against the side wall of the pressing plate 6 when the pressing plate 6 and the moving plate 5 reset. Guide components for guiding the movement of the pressing plate 6 are arranged at both ends of the limiting section 10. The guide components include guide posts 9 arranged coaxially at both ends of the limiting section 10 with opposite extending directions and diameters smaller than that of the limiting section 10. The two ends of the two guide posts 9 away from the limiting section 10 respectively penetrate out of the pressing plate 6. The number of the guide posts 9 is the same as that of the springs 11, and the springs 11 are sleeved on the parts where the guide posts 9 extend out of the pressing plate 6. In this embodiment, eight guide posts 9 are arranged, and a spring 11 is sleeved on each end of each guide post 9 respectively. The number of bolts 8 arranged is the same as that of the guide posts 9, and the limiting section 10 and the guide posts 9 are sleeved on the screw rod of the bolt 8.

[0032] Specific process: When the turntable 3 rotates to cause axial movement of the rotating shaft 2, the moving plate 5 fixedly arranged at the end of the rotating shaft 2 away from the turntable 3 will be displaced under the drive of the rotating shaft 2. When the moving plate 5 moves, it will push the pressing plate 6 towards the fixed plate 7 in the same direction as the moving direction of the rotating shaft 2. The spring 11 arranged between the pressing plate 6 and the fixed plate 7 will be compressed by the pressing plate 6. At this time, the spring 11 will exert a reaction force on the pressing plate 6, thereby reducing the displacement amplitude of the rotating shaft 2. The fixed plate 7 will limit the range of axial movement of the rotating shaft 2. Since the turntable 3 is fixedly arranged at the end of the rotating shaft 2 away from the fixed plate 7, when the rotating shaft 2 rotates and moves axially, the turntable 3 will also move axially. While restricting the movement amplitude of the rotating shaft 2 through the fixed plate 7 and the spring 11, the movement amplitude of the turntable 3 will also be restricted. When the turntable 3 stops rotating, the compressed spring 11 will recover, thereby pushing the rotating shaft 2 back to its original position until the side wall of the pressing plate 6 abuts against the side wall of the limiting section 10. At this time, the rotating shaft 2 is reset to its initial position, providing a space for movement when axial movement occurs subsequently. Therefore, when the operator installs the turntable 3 on the rotating shaft 2, leaving a space for the turntable 3 to displace when the rotating shaft 2 moves axially between the turntable 3 and the template 1 can reduce the probability of the turntable 3 rubbing against the template 1 due to the axial movement of the rotating shaft 2, reduce the probability of damage to the turntable 3, and improve the service life of the turntable 3. At the same time, since there is a certain gap between the template 1 and the turntable 3, when the mold is closed, the turntable 3 will be squeezed by the turntable clamping mechanism and move closer to the template 1 and fit with the template 1. At this time, the spring 11 at the part of the limiting section 10 away from the template 1 will be compressed; when the mold is opened, the turntable 3 will lose the extrusion of the turntable clamping mechanism on it. At this time, the compressed spring 11 will recover and push the turntable 3 to move away from the template 1 and reset.

[0033] The above are only the preferred embodiments of the present invention. The protection scope of the present invention is not limited to the above embodiments. All technical solutions falling within the idea of the present invention belong to the protection scope of the present invention. It should be noted that for those of ordinary skill in the art in this technical field, without departing from the principle of the present invention, several improvements and refinements should also be regarded as within the protection scope of the present invention.

Claims

1. A shaft elastic limit structure, including a shaft (2), characterized in that: A limiting structure for controlling the axial displacement amount of the rotating shaft (2) is provided at one end of the rotating shaft (2). The limiting structure includes a moving plate (5) fixedly arranged on the rotating shaft (2) and capable of moving axially together with the rotating shaft (2). Pressing plates (6) that can be driven by the moving plate are respectively arranged on both sides of the moving plate (5). Fixing plates (7) for restricting the displacement amount of the pressing plates (6) are arranged on the sides of the two pressing plates (6) away from the moving plate (5). A reset component for driving the moving plate to move away from the fixing plate is arranged between the moving plate (5) and the fixing plate that face each other.

2. The elastic limiting structure for a rotating shaft according to claim 1, wherein: The reset component includes a plurality of springs (11) arranged between the fixing plate (7) and the moving plate (5). The two ends of the spring (11) are respectively abutted against the two.

3. The elastic limit structure of a rotating shaft according to claim 2, wherein: A guiding component for guiding the movement of the pressing plate and the moving plate is arranged between the two fixing plates.

4. The elastic limit structure of a rotating shaft according to claim 3, wherein: The guiding component includes guiding columns arranged between the two fixing plates. The two ends of the guiding columns respectively penetrate outside the corresponding pressing plates.

5. The elastic limit structure of a rotating shaft according to claim 4, characterized in that: A position limiting component for driving the pressing plate and the moving plate to always reset to the initial position under the action of the spring is arranged on the guiding column between the two pressing plates.

6. The elastic limit structure of a rotating shaft according to claim 5, wherein: The position limiting component includes a limiting section with a diameter larger than that of the guiding column arranged on the guiding column between the two pressing plates.

7. The elastic limiting structure of a rotating shaft according to claim 3, characterized in that: The spring is sleeved on the guiding column.

8. A shaft elastic limit structure according to claim 1, characterized in that: A gasket (12) is respectively arranged at one end of the two pressing plates (6) close to the moving plate (5).

9. A rotary injection molding machine, comprising a template (1), a turntable (3) arranged at one end of the template (1), and needle roller bearings (4) coaxially arranged at both ends of the template (1), characterized in that, The middle part of the template (1) is provided with a rotating shaft elastic limiting structure as described in any one of claims 1-8. The two fixing plates (7) are fixedly arranged on the side of the template (1) away from the turntable (3) through bolts (8). The turntable (3) is fixedly arranged at one end of the rotating shaft (2) extending outside the template (1).

Images