A rotary table push cylinder mechanism for a two-color injection molding machine

Abstract

This utility model discloses a rotary push cylinder mechanism for a two-color injection molding machine, including a template with supporting feet at the bottom. A hollow shaft is rotatably mounted at the center of the template, and a turntable is connected to one end of the hollow shaft. An external gear is mounted on the side of the turntable. A drive assembly is provided for the template to mesh with the external gear. Several push cylinders are mounted in the middle of the template, and a clamping assembly for fixing the turntable is provided on the side of the template. When the friction plate of the cylinder is worn to a certain extent, the gap between the front cover of the push cylinder and the mounting surface of the template can be reduced. When the friction plate is completely worn, the push cylinder can be completely removed from the back of the template for replacement without disassembling the mold turntable, making maintenance convenient.

Description

Technical Field

[0001] This utility model relates to the technical field of two-color injection molding machines, and in particular to a rotary table push cylinder mechanism for a two-color injection molding machine. Background Technology

[0002] With the continuous development of two-color injection molding machines, the clamping tonnage of these machines is constantly increasing, and the weight of the mold on the turntable is also rising accordingly. To prevent the turntable from rubbing against the mold plate surface during its 180-degree reciprocating rotation after the mold is installed, most machines currently install a push-cylinder mechanism on the turntable to disengage the turntable from the mold plate before the turntable reciprocates. However, the turntable push-cylinder structure has the following problems:

[0003] After the turntable pusher cylinder pushes the turntable away from the template, there are several issues that need to be addressed regarding the maintenance of cylinder pressure during turntable rotation. a) If the cylinder pressure is not maintained, due to the heavy weight of the mold on the turntable, there will be a certain degree of tilt between the turntable and the template surface after separation. During turntable rotation, the turntable may push back the cylinder, potentially causing wear between the turntable and the template surface. To prevent this wear, friction plates should be installed on the template surface, or the cylinder pressure should be maintained continuously. b) If the cylinder pressure is maintained continuously, the cylinder will press the turntable tightly against the turntable's fixing claws. During turntable rotation, significant frictional resistance will be generated between the turntable and the fixing claws. This can result in insufficient driving force for the turntable, preventing it from rotating, and in severe cases, causing iron powder to be ground out and damaging the turntable. Utility Model Content

[0004] The purpose of this utility model is to provide a rotary table push cylinder mechanism for a two-color injection molding machine to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, this utility model provides the following technical solution: a rotary table push cylinder mechanism for a two-color injection molding machine, comprising a template, a support foot at the bottom of the template, a hollow shaft rotating at the center of the template, a rotary table connected to one end of the hollow shaft, an external gear on the side of the rotary table, a drive assembly for meshing and transmitting power between the template and the external gear, a plurality of push cylinders in the middle of the template, and a clamping assembly for fixing the rotary table on the side of the template.

[0006] Preferably, the drive assembly includes a drive gear shaft rotatably mounted on the top of the template, a drive wheel meshing with the external gear on the outer circular wall of the drive gear shaft, and an output shaft and a motor fixedly connected to the drive gear shaft on the side of the template.

[0007] Preferably, the template has several mounting holes running through its center. The push cylinder is mounted to one side of the mounting holes by fixing screws. The side wall of the push cylinder has several adjusting screws. The outer circular wall of the adjusting screws has a locking nut. The output end of the push cylinder is connected to a cylinder friction plate.

[0008] Preferably, the clamping assembly includes a plurality of turntable fixing claws arranged in a ring around the side of the template, a turntable friction plate is provided on one side of the turntable fixing claws, and the template is provided with turntable clamping claws on the side of the turntable fixing claws.

[0009] Preferably, the turntable is provided with a limiting block on its side, and the template is provided with a limiting frame symmetrically on its side.

[0010] Preferably, the turntable is provided with positioning holes distributed at 180 degrees, and a positioning cylinder is provided on the side of the template. The telescopic end of the positioning cylinder is provided with a positioning pin that is inserted into the positioning hole.

[0011] The beneficial effects of this utility model are:

[0012] 1. By driving the pistons of the four push cylinders under the pressure of hydraulic oil, the pistons fit against the front cover of the push cylinders, pushing the turntable out of the end face of the template. At the same time, a certain gap is maintained between the turntable and the turntable fixing claw. Then, the motor in the drive assembly is controlled to drive the turntable to rotate, and the push cylinders maintain pressure to ensure that the push cylinders are not pressed back by the turntable and rub against the end face of the template. This avoids wear caused by cross-sectional friction between the turntable and the template, and also avoids large frictional resistance caused by the turntable and the turntable fixing claw being pressed tightly together, which would result in insufficient driving force for the turntable to turn. This avoids damage to the turntable during the reciprocating rotation of the turntable and improves the practicality of the equipment.

[0013] 2. When the friction plate of the hydraulic cylinder is worn to a certain extent, the gap between the front cover of the push cylinder and the template mounting surface can be reduced. When the friction plate is completely worn, the push cylinder can be completely removed from the back of the template for replacement without disassembling the mold turntable, etc., making maintenance convenient. Attached Figure Description

[0014] Figure 1 This is a first-view perspective three-dimensional structural diagram of an embodiment of the present utility model;

[0015] Figure 2 This is a second-view perspective three-dimensional structural diagram of an embodiment of the present utility model;

[0016] Figure 3 This is a three-dimensional structural diagram of the present invention without the turntable;

[0017] Figure 4 This is a cross-sectional perspective view of the three-dimensional structure of the present invention, excluding the turntable;

[0018] Figure 5 This is a three-dimensional structural diagram of the turntable in an embodiment of the present utility model;

[0019] Figure 6 This is a three-dimensional structural diagram of the push cylinder in an embodiment of the present utility model;

[0020] Figure 7 This is a cross-sectional perspective view of the push cylinder in an embodiment of the present invention.

[0021] In the diagram: 1. Template; 2. Support foot; 3. Hollow shaft; 4. Turntable; 5. External gear; 6. Drive assembly; 61. Drive gear shaft; 62. Drive wheel; 63. Motor; 7. Push cylinder; 8. Clamping assembly; 81. Turntable fixing claw; 82. Turntable friction plate; 83. Turntable gripper; 9. Mounting hole; 10. Fixing screw; 11. Adjusting screw; 12. Locking nut; 13. Cylinder friction plate; 14. Limit block; 15. Limit frame; 16. Positioning hole; 17. Positioning cylinder; 18. Positioning pin. Detailed Implementation

[0022] 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.

[0023] Please see Figures 1 to 7This utility model provides a mechanism for a two-color injection molding machine turntable 4 with push cylinders 7, including a template 1. The template 1 has support feet 2 at its bottom. A hollow shaft 3 rotates around the center of the template 1, and a turntable 4 is connected to one end of the hollow shaft 3. An external gear 5 is provided on the side of the turntable 4. A drive assembly 6 meshes with the external gear 5 to drive the template 1. Several push cylinders 7 are located in the middle of the template 1. A clamping assembly 8 for fixing the turntable 4 is provided on the side of the template 1. When the turntable 4 rotates 180 degrees, the pistons of the four push cylinders 7 are driven by hydraulic oil to push the cylinders 4 with the push cylinders 7. The front cover of the push cylinder 7 is closed, pushing the turntable 4 out of the end face of the template 1. At the same time, a certain gap is maintained between the turntable 4 and the turntable fixing claw 81. Then, the motor 63 in the drive assembly 6 is controlled to drive the turntable 4 to rotate. The push cylinder 7 maintains pressure to ensure that the push cylinder 7 is not pressed back by the turntable 4 and rubs against the end face of the template 1. This avoids wear caused by cross-sectional friction between the turntable 4 and the template 1. It also avoids large frictional resistance caused by the turntable 4 and the turntable fixing claw 81 being pressed together, which would result in insufficient driving force for the turntable 4 and prevent it from rotating. This avoids damage to the turntable 4 during the reciprocating rotation of the turntable 4 and improves the practicality of the equipment.

[0024] like Figure 4 As shown, specifically, the driving component 6 includes a drive gear shaft 61 rotatably mounted on the top of the template 1. The outer circular wall of the drive gear shaft 61 meshes with the external gear 5 to provide a drive wheel 62. The side of the template 1 is provided with an output shaft and a motor 63 fixedly connected to the drive gear shaft 61. By starting the motor 63, the drive gear shaft 61 is driven to rotate synchronously in both directions, which drives the drive wheel 62 to mesh synchronously with the external gear 5, thus conveniently realizing the turntable 4 to rotate 180 degrees back and forth on one side of the template 1.

[0025] like Figure 2 and Figure 3 As shown, specifically, the template 1 has several mounting holes 9 through its middle. The push cylinder 7 is installed to one side of the mounting hole 9 by fixing screws 10. The side wall of the push cylinder 7 is provided with several adjusting screws 11. The outer circular wall of the adjusting screw 11 is provided with a locking nut 12. The output end of the push cylinder 7 is connected to a cylinder friction plate 13. By installing four push cylinders 7 on the side of the template 1 away from the turntable 4, it is convenient to adjust the gap between the front cover of the push cylinder 7 and the end face of the template 1 by adjusting the adjusting screws 11. Then, by controlling the piston of the push cylinder 7 to extend, the turntable 4 is pushed out and separated from the end face of the template 1. After the fixing screws 10 of the push cylinder 7 are loosened, the push cylinder 7 can be removed as a whole, which is convenient for replacing the friction plate at the front end of the push cylinder 7 and reducing the maintenance time of this equipment.

[0026] Specifically, the clamping assembly 8 includes a plurality of turntable fixing claws 81 arranged in a ring on the side of the template 1. A turntable friction plate 82 is provided on one side of the turntable fixing claws 81. The template 1 is provided with turntable clamping claws 83 on one side of the turntable fixing claws 81. Before the turntable 4 is rotated back and forth, the turntable clamping claws 83 are released to facilitate the push cylinder 7 to push the turntable 4 out, so that the turntable 4 is separated from the end face of the template 1, which facilitates the subsequent 180-degree reciprocating rotation operation of the turntable 4. When the turntable 4 finishes its operation, the pressure of the push cylinder 7 is released, and the turntable clamping claws 83 clamp the turntable 4 so that it fits against the end face of the template 1, eliminating the gap between the end face of the turntable 4 and the template 1. At the same time, the turntable 4 pushes the piston of the push cylinder 7 back.

[0027] like Figure 4 As shown, specifically, the hollow shaft 3 is rotatably mounted in the middle of the template 1 by two symmetrically arranged needle roller bearings, and each of the two needle roller bearings is provided with a pressure cap on the outward side. The pressure cap is fitted with an oil seal on the outer circular wall of the hollow shaft 3, and the two needle roller bearings are axially positioned with a bearing spacer on the inward side.

[0028] Specifically, since the inner and outer rings of the needle roller bearing can move axially in a small amount, and the four turntable fixing claws 81 are fixed on the template 1, the turntable 4 can be hooked by the four turntable fixing claws 81, so that the turntable 4 and the hollow shaft 3 can only move axially in a small amount and will not completely separate.

[0029] Specifically, the model of the turntable gripper 83 is TY-6B(HZ).

[0030] Specifically, the turntable 4 is provided with a limiting block 14 on its side, and the template 1 is provided with a limiting frame 15 symmetrically on its side. The limiting block 14 and the limiting frame 15 work together to achieve mechanical limiting, prevent the motor 63 from losing control, and ensure the safety of the equipment.

[0031] like Figure 2 and Figure 3 As shown, specifically, the turntable 4 is provided with positioning holes 16 distributed at 180 degrees, and the template 1 is provided with a positioning cylinder 17 on its side. The telescopic end of the positioning cylinder 17 is provided with a positioning pin 18 that is inserted into the positioning hole 16. When the motor 63 drives the turntable 4 to rotate 180 degrees, the positioning cylinder 17 is extended by controlling it to insert the positioning pin 18 into the positioning hole 16 of the turntable 4, thereby achieving precise positioning of the turntable 4 and improving the accuracy of the turntable 4 during rotation.

[0032] The working principle of this utility model is as follows: In use, first loosen the turntable clamp 83. Then, the external hydraulic system drives the push cylinder 7 to apply pressure. The push cylinder 7 pushes the turntable 4 forward a small distance, separating the turntable 4 from the end face of the template 1. Simultaneously, the piston of the push cylinder 7 engages with the cylinder's front cover, creating a gap between the turntable 4 and the friction plate of the turntable fixing claw 81. This maintains the pressure of the push cylinder 7. As the turntable 4 reciprocates, the back of the turntable 4 is supported by the push friction plate, preventing damage from friction with the end face of the template 1. At the same time, the friction between the turntable 4 and the turntable fixing claw 81... The gap between the friction plates eliminates frictional resistance, resulting in low resistance for the drive motor 63 of the turntable 4 and saving energy. When the turntable 4 finishes its operation, the pressure of the push cylinder 7 is released, and the turntable gripper 83 clamps the turntable 4 tightly against the end face of the template 1 to eliminate the gap. At the same time, the turntable 4 pushes the piston of the push cylinder 7 back. When the friction plate 13 of the cylinder has a certain wear, the gap between the front cover of the push cylinder 7 and the mounting surface of the template 1 can be reduced. When the friction plate is completely worn, the push cylinder 7 can be completely removed from the back of the template 1 for replacement without disassembling the mold turntable 4, making maintenance convenient.

[0033] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions or improvements made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A double-color injection molding machine rotary push oil cylinder mechanism comprising a mold plate (1) provided with support feet (2) at the bottom, characterized in that; The template (1) has a hollow shaft (3) rotating at its center. One end of the hollow shaft (3) is connected to a turntable (4). The turntable (4) has an external gear (5) on its side. The template (1) meshes with the external gear (5) to drive the transmission of the drive assembly (6). The template (1) has several push cylinders (7) in the middle. The template (1) has a clamping assembly (8) on its side for fixing the turntable (4). The template (1) has several mounting holes (9) through the middle. The push cylinder (7) is installed to one side of the mounting hole (9) by fixing screws (10). The side wall of the push cylinder (7) is provided with several adjusting screws (11). The outer circular wall of the adjusting screw (11) is provided with a locking nut (12). The output end of the push cylinder (7) is connected to a cylinder friction plate (13). The clamping assembly (8) includes a plurality of turntable fixing claws (81) arranged in a ring on the side of the template (1), a turntable friction plate (82) is provided on one side of the turntable fixing claws (81), and a turntable clamping claw (83) is provided on one side of the template (1) located on the turntable fixing claws (81).

2. The pusher cylinder mechanism of a rotary table of a two-color injection molding machine according to claim 1, characterized in that; The drive assembly (6) includes a drive gear shaft (61) rotatably mounted on the top of the template (1), a drive wheel (62) meshing with the external gear (5) on the outer circular wall of the drive gear shaft (61), and a motor (63) whose output shaft is fixedly connected to the drive gear shaft (61) on the side of the template (1).

3. The pusher cylinder mechanism of claim 1, wherein: The turntable (4) is provided with a limiting block (14) on its side, and the template (1) is provided with a limiting frame (15) symmetrically on its side.

4. The rotary table pusher cylinder mechanism of claim 1, wherein: The turntable (4) is provided with positioning holes (16) distributed at 180 degrees. The template (1) is provided with a positioning cylinder (17) on its side. The telescopic end of the positioning cylinder (17) is connected to the positioning hole (16) and is provided with a positioning pin (18).

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