A tie rod structure for a dual-motor injection molding machine

Abstract

This utility model discloses a tie rod structure for a dual-motor injection molding machine, including a tailstock and a headstock. The tailstock and headstock are fixed together by multiple tie rods. A middle frame is slidably connected to a lead screw. Two sets of drive assemblies are detachably mounted on the tailstock. Two lead screw assemblies are provided between the tailstock and the middle frame corresponding to the two sets of drive assemblies. The drive assemblies drive the lead screw assemblies to rotate, and the lead screw assemblies can extend and retract through rotation to drive the middle frame to slide on the tie rods. By combining a double-ended threaded lead screw assembly with a synchronous toothed belt drive, the output deviation of the dual motors is effectively eliminated, ensuring the precise sliding of the middle frame on the four high-strength tie rods and significantly reducing the risk of skewing.

Description

Technical Field

[0001] This utility model relates to the field of motor technology, specifically to a tie rod structure for a dual-motor injection molding machine. Background Technology

[0002] During the movement of the injection stage in a dual-motor injection molding machine, the slight difference in output torque or speed between the two motors in the dual-drive structure can easily lead to asynchronous movement of the lead screw assembly, resulting in problems such as overall stage skew, vibration, or decreased positioning accuracy. Traditional solutions often use a single drive or a mechanical coupling for forced synchronization, but the former is difficult to meet the demands of high loads, while the latter suffers from drawbacks such as complex structure, slow response, and high maintenance costs. Utility Model Content

[0003] The purpose of this invention is to solve the problems mentioned above in the background technology and to propose a tie rod structure for a dual-motor injection molding machine.

[0004] The objective of this utility model can be achieved through the following technical solutions:

[0005] A tie rod structure for a dual-motor injection molding machine includes a tailstock and a headstock. The tailstock and headstock are fixed together by four tie rods arranged in a square. A middle frame is slidably connected to the lead screws. Two sets of drive assemblies are detachably mounted on the tailstock. Two lead screw assemblies are provided between the tailstock and the middle frame corresponding to the two sets of drive assemblies. The drive assemblies are used to drive the lead screw assemblies to rotate. The lead screw assemblies can drive the middle frame to slide on the tie rods through rotation and extension.

[0006] As a further embodiment of this utility model: the drive assembly includes a motor, a belt and a synchronous pulley, the synchronous pulley is fixed at one end of the lead screw assembly, and the output shaft of the motor drives the synchronous pulley to rotate through the belt.

[0007] As a further embodiment of this utility model: the lead screw assembly includes a sleeve and a lead screw, one end of the sleeve is fixed to the middle frame, one end of the lead screw is rotatably connected to the tailstock, and the lead screw is threadedly connected to the sleeve.

[0008] As a further embodiment of this utility model: the inner wall of the sleeve is provided with a double-threaded structure, and the thread lead is equal to the pitch of the lead screw.

[0009] As a further embodiment of this invention, the belt is a synchronous toothed belt.

[0010] As a further embodiment of this invention: the surface of the belt is covered with a tensile nylon fiber layer.

[0011] As a further embodiment of this invention: the motor is a servo motor, and the output shafts of the two sets of motors are synchronously controlled by an encoder.

[0012] As a further embodiment of this utility model, a self-lubricating bearing is provided at the sliding connection between the middle frame and the tie rod.

[0013] As a further embodiment of this invention: the bearing is embedded with a copper-based graphite composite material.

[0014] As a further embodiment of this utility model: the surface of the pull rod is provided with a wear-resistant coating, the material of which is high-strength alloy steel.

[0015] The beneficial effects of this utility model are:

[0016] Closed-loop synchronous control is achieved by using two sets of servo motors in conjunction with an encoder. Combined with a double-headed threaded screw assembly and synchronous toothed belt drive, the output deviation of the two motors is effectively eliminated, ensuring the precise sliding of the central frame on the four high-strength tie rods and greatly reducing the risk of skewing.

[0017] Enhanced load-bearing capacity and durability: The four square-arranged tie rods are made of high-strength alloy steel and covered with a wear-resistant coating. Combined with the self-lubricating copper-based graphite bearings in the central frame, the structural bending stiffness and wear resistance are significantly improved, extending the service life of the equipment. Attached Figure Description

[0018] The present invention will be further described below with reference to the accompanying drawings.

[0019] Figure 1 This is a schematic diagram of the structure of this utility model;

[0020] Figure 2 This is a schematic diagram of the planar structure of this utility model;

[0021] Figure 3 This is a partial structural schematic diagram of the present invention.

[0022] In the diagram: 1. Tail frame; 2. Middle frame; 3. Head frame; 4. Tie rod; 5. Motor; 6. Belt; 7. Lead screw assembly. Detailed Implementation

[0023] 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 skilled in the art without creative effort are within the protection scope of the present utility model.

[0024] Example 1, please refer to Figure 1-3As shown, this utility model is a tie rod structure for a dual-motor injection molding machine, including a tailstock 1 and a headstock 3. The tailstock 1 and the headstock 3 are fixed to each other by four tie rods 4 arranged in a square. A middle frame 2 is slidably connected to the lead screw 4. Two sets of drive assemblies are detachably installed on the tailstock 1. Two lead screw assemblies 7 are provided between the tailstock 1 and the middle frame 2 corresponding to the two sets of drive assemblies. The drive assemblies are used to drive the lead screw assemblies 7 to rotate. The lead screw assemblies 7 can drive the middle frame 2 to slide on the tie rods 4 through rotation and extension.

[0025] Example 2, please refer to Figure 1-3 As shown, this utility model relates to a tie rod structure for a dual-motor injection molding machine, comprising a tailstock 1 and a headstock 3. The tailstock 1 and the headstock 3 are mutually fixed by four tie rods 4 arranged in a square. A middle frame 2 is slidably connected to the lead screw 4. A self-lubricating bearing is provided at the sliding connection between the middle frame 2 and the tie rods 4. The surface of the tie rods 4 is coated with a wear-resistant coating, and its material is high-strength alloy steel.

[0026] Two drive assemblies are detachably mounted on the tailstock 1. Each drive assembly includes a motor 5, a belt 6, and a synchronous pulley. The synchronous pulley is fixed to one end of the lead screw assembly 7. The output shaft of the motor 5 drives the synchronous pulley to rotate via the belt 6. The belt 6 is a synchronous toothed belt. The surface of the belt 6 is covered with a tensile-resistant nylon fiber layer. The motor 5 is a servo motor, and the output shafts of the two motors 5 are synchronously controlled via an encoder.

[0027] Two lead screw assemblies 7 are provided between the tail frame 1 and the middle frame 2, corresponding to the two sets of drive components. The drive components are used to drive the lead screw assemblies 7 to rotate. The lead screw assemblies 7 can drive the middle frame 2 to slide on the pull rod 4 through rotation and extension.

[0028] Example 3, please refer to Figure 1-3 As shown, this utility model relates to a tie rod structure for a dual-motor injection molding machine, comprising a tailstock 1 and a headstock 3. The tailstock 1 and the headstock 3 are mutually fixed by four tie rods 4 arranged in a square. A middle frame 2 is slidably connected to the lead screw 4. A self-lubricating bearing is provided at the sliding connection between the middle frame 2 and the tie rods 4. The surface of the tie rods 4 is coated with a wear-resistant coating, and its material is high-strength alloy steel.

[0029] Two drive assemblies are detachably mounted on the tailstock 1. Each drive assembly includes a motor 5, a belt 6, and a synchronous pulley. The synchronous pulley is fixed to one end of the lead screw assembly 7. The output shaft of the motor 5 drives the synchronous pulley to rotate via the belt 6. The belt 6 is a synchronous toothed belt. The surface of the belt 6 is covered with a tensile-resistant nylon fiber layer. The motor 5 is a servo motor, and the output shafts of the two motors 5 are synchronously controlled via an encoder.

[0030] Two lead screw assemblies 7 are provided between the tailstock 1 and the middle frame 2, corresponding to the two sets of drive components. The drive components are used to drive the lead screw assemblies 7 to rotate. The lead screw assemblies 7 can drive the middle frame 2 to slide on the pull rod 4 through rotation and extension. The lead screw assembly 7 includes a sleeve and a lead screw. One end of the sleeve is fixed to the middle frame 2, and one end of the lead screw is rotatably connected to the tailstock 1. The lead screw is threadedly connected to the sleeve.

[0031] Example 4, please refer to Figure 1-3 As shown, this utility model relates to a tie rod structure for a dual-motor injection molding machine, comprising a tailstock 1 and a headstock 3. The tailstock 1 and the headstock 3 are mutually fixed by four tie rods 4 arranged in a square. A middle frame 2 is slidably connected to the lead screw 4. A self-lubricating bearing is provided at the sliding connection between the middle frame 2 and the tie rods 4, and the bearing is embedded with copper-based graphite composite material. The surface of the tie rods 4 is coated with a wear-resistant coating, and its material is high-strength alloy steel.

[0032] Two drive assemblies are detachably mounted on the tailstock 1. Each drive assembly includes a motor 5, a belt 6, and a synchronous pulley. The synchronous pulley is fixed to one end of the lead screw assembly 7. The output shaft of the motor 5 drives the synchronous pulley to rotate via the belt 6. The belt 6 is a synchronous toothed belt. The surface of the belt 6 is covered with a tensile-resistant nylon fiber layer. The motor 5 is a servo motor, and the output shafts of the two motors 5 are synchronously controlled via an encoder.

[0033] Two lead screw assemblies 7 are provided between the tailstock 1 and the middle frame 2, corresponding to the two sets of drive components. The drive components are used to drive the lead screw assemblies 7 to rotate. The lead screw assemblies 7 can drive the middle frame 2 to slide on the pull rod 4 through rotation and extension. The lead screw assembly 7 includes a sleeve and a lead screw. One end of the sleeve is fixed to the middle frame 2, and one end of the lead screw is rotatably connected to the tailstock 1. The lead screw is threadedly connected to the sleeve.

[0034] Based on the above embodiments, it should be noted that:

[0035] Closed-loop synchronous control is achieved by using two sets of servo motors in conjunction with encoders. Combined with the double-headed threaded screw assembly 7 and synchronous toothed belt drive, the output deviation of the two motors is effectively eliminated, ensuring the precise sliding of the central frame on the four high-strength tie rods 4 and greatly reducing the risk of skewing.

[0036] Enhanced load-bearing capacity and durability: The four square-arranged tie rods are made of high-strength alloy steel and covered with a wear-resistant coating. Combined with the self-lubricating copper-based graphite bearings in the central frame, they significantly improve the structural bending stiffness and wear resistance, extending the service life of the equipment.

[0037] The foregoing has provided a detailed description of one embodiment of the present invention, but the description is merely a preferred embodiment and should not be construed as limiting the scope of the present invention. All equivalent variations and improvements made within the scope of the claims of the present invention should still fall within the scope of the claims of the present invention.

Claims

1. A tie rod structure of a twin motor injection molding machine, characterized by, The device includes a tailstock (1) and a headstock (3). The tailstock (1) and the headstock (3) are fixed to each other by four square-arranged tie rods (4). A middle frame (2) is slidably connected to the lead screw (4). Two sets of drive components are detachably installed on the tailstock (1). Two lead screw assemblies (7) are provided between the tailstock (1) and the middle frame (2) corresponding to the two sets of drive components. The drive components are used to drive the lead screw assemblies (7) to rotate. The lead screw assemblies (7) can drive the middle frame (2) to slide on the tie rods (4) by rotating and extending.

2. The tie rod structure of a dual-motor injection molding machine according to claim 1, characterized in that, The surface of the pull rod (4) is provided with a wear-resistant coating, and its material is high-strength alloy steel.

3. The tie rod structure of a dual-motor injection molding machine according to claim 1, characterized in that, The drive assembly includes a motor (5), a belt (6) and a synchronous pulley. The synchronous pulley is fixed at one end of the lead screw assembly (7). The output shaft on the motor (5) drives the synchronous pulley to rotate through the belt (6).

4. The tie rod structure of a dual-motor injection molding machine according to claim 1, characterized in that, The lead screw assembly (7) includes a sleeve and a lead screw. One end of the sleeve is fixed to the middle frame (2), and one end of the lead screw is rotatably connected to the tail frame (1). The lead screw is threadedly connected to the sleeve.

5. The tie rod structure of a dual-motor injection molding machine according to claim 4, characterized in that, The inner wall of the sleeve is provided with a double-threaded structure, and the thread lead is equal to the pitch of the lead screw.

6. The tie rod structure of a dual-motor injection molding machine according to claim 3, characterized in that, The belt (6) is a synchronous toothed belt.

7. The tie rod structure of a dual-motor injection molding machine according to claim 3, characterized in that, The surface of the belt (6) is covered with a tensile nylon fiber layer.

8. The tie rod structure of a dual-motor injection molding machine according to claim 3, characterized in that, The motor (5) is a servo motor, and the output shafts of the two sets of motors (5) are synchronously controlled by an encoder.

9. The tie rod structure of a dual-motor injection molding machine according to claim 1, characterized in that, The sliding connection between the middle frame (2) and the tie rod (4) is provided with a self-lubricating bearing.

10. The tie rod structure of a dual-motor injection molding machine according to claim 9, characterized in that, The bearing is embedded with copper-based graphite composite material.

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