High-low speed dual drive mechanism

Abstract

This invention relates to a high-speed and low-speed dual-drive mechanism, comprising a frame, a high-speed external rotor DC motor fixedly mounted on the frame, a base plate, a first end plate and a second end plate disposed at both ends of the base plate, a first stepper motor disposed on the outer side of the first end plate, and a lead screw fixedly connected to the output shaft of the first stepper motor; the lead screw passes through the first end plate and is rotatably connected to the second end plate; a slide is disposed on the lead screw, and a second stepper motor is disposed on the slide; a synchronous pulley is disposed on the output shaft of the second stepper motor, and a synchronous belt cooperating with the synchronous pulley is disposed on the outer side of the external rotor of the high-speed external rotor DC motor. This invention can achieve both high-speed rotation of the motor and low-speed precise positioning rotation.

Description

Technical Field

[0001] This invention relates to a high-speed and low-speed dual-drive mechanism. Background Technology

[0002] Currently, high-speed DC motors can only operate at high speeds and cannot achieve low-speed positioning. Stepper motors can achieve low-speed positioning but cannot rotate at high speeds. Only high-speed servo motors can achieve both high-speed rotation and precise positioning. However, high-speed servo motors are expensive and not suitable for use in mass-produced, low-cost instruments. Summary of the Invention

[0003] The purpose of this invention is to provide a high-speed and low-speed dual-drive mechanism that can achieve both high-speed rotation of the motor and low-speed precise positioning rotation.

[0004] The present invention adopts the following technical solution:

[0005] A high-speed and low-speed dual-drive mechanism includes a frame, a high-speed external rotor DC motor fixedly mounted on the frame, a base plate, a first end plate and a second end plate mounted at both ends of the base plate, a first stepper motor mounted on the outer side of the first end plate, and a lead screw fixedly connected to the output shaft of the first stepper motor; the lead screw passes through the first end plate and is rotatably connected to the second end plate; a slide is mounted on the lead screw, a second stepper motor is mounted on the slide, a synchronous pulley is mounted on the output shaft of the second stepper motor, and a synchronous belt that cooperates with the synchronous pulley is mounted on the outer side of the external rotor of the high-speed external rotor DC motor.

[0006] Furthermore, limit switches are respectively provided on the first end plate and the second end plate.

[0007] Furthermore, a slide rail parallel to the lead screw is fixedly provided between the first end plate and the second end plate, and the slide table slides in conjunction with the slide rail.

[0008] Furthermore, the slide rail includes a first slide rail and a second slide rail disposed on both sides of the lead screw.

[0009] Furthermore, the lead screw is a ball screw.

[0010] The beneficial effects of this invention are as follows: This invention overcomes the problem of unstable operation or lack of low-speed operation of high-speed external rotor DC motors at low speeds. It can achieve both high-speed rotation and low-speed precise positioning rotation. Under certain circumstances, it can replace high-speed servo motors and reduce costs. Attached Figure Description

[0011] Figure 1 This is a schematic diagram of the structure of the present invention.

[0012] Figure 2 This is a three-dimensional structural diagram of the present invention. Detailed Implementation

[0013] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings.

[0014] like Figure 1 and Figure 2 As shown, a high-speed and low-speed dual-drive mechanism includes a frame 1, a high-speed external rotor DC motor 2 fixedly mounted on the frame 1, a base plate 3, a first end plate 4 and a second end plate 5 mounted at both ends of the base plate 3, a first stepper motor 6 mounted on the outer side of the first end plate 4, and a lead screw 7 fixedly connected to the output shaft of the first stepper motor 6; the lead screw 7 passes through the first end plate 4 and is rotatably connected to the second end plate 5; a slide table 8 is mounted on the lead screw 7, a second stepper motor 9 is mounted on the slide table 8, a synchronous pulley 10 is mounted on the output shaft of the second stepper motor 9, and a synchronous belt 11 that cooperates with the synchronous pulley 10 is mounted on the outer side of the external rotor of the high-speed external rotor DC motor 2.

[0015] Preferably, the lead screw 7 is a ball screw.

[0016] The first stepper motor drives the lead screw to rotate, thereby moving the slide table along the lead screw. When the device needs to output high-speed rotation, the slide table moves away from the high-speed external rotor DC motor, and the high-speed external rotor DC motor directly outputs power. When the device needs to output low-speed rotation or rotate to a certain angle, the high-speed external rotor DC motor stops working, the first stepper motor starts working, moving the slide table closer to the high-speed external rotor DC motor until the synchronous pulley engages with the synchronous belt. At this time, the second stepper motor starts working, the synchronous pulley drives the synchronous belt to rotate, thereby driving the external rotor of the high-speed external rotor DC motor to rotate, and the high-speed external rotor DC motor completes the low-speed rotation or rotates to a certain angle.

[0017] This invention can achieve both high-speed rotation of the motor and low-speed precise positioning rotation. In certain situations, it can replace high-speed servo motors and reduce costs.

[0018] Limit switches 12 are respectively installed on the first end plate 4 and the second end plate 5. The limit switches are used to determine the position of the slide table, facilitating control. A slide rail parallel to the lead screw is fixedly installed between the first end plate 4 and the second end plate 5, and the slide table 8 slides in cooperation with the slide rail. The slide rail includes a first slide rail 13 and a second slide rail 14 installed on both sides of the lead screw 7. The first and second slide rails work together to prevent the slide table from wobbling left and right during operation, ensuring stable operation.

[0019] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A high-low speed dual drive mechanism, characterized by, It includes a frame (1), a high-speed external rotor DC motor (2) fixedly mounted on the frame (1), a base plate (3), a first end plate (4) and a second end plate (5) mounted at both ends of the base plate (3), a first stepper motor (6) mounted on the outside of the first end plate (4), and a lead screw (7) fixedly connected to the output shaft of the first stepper motor (6); the lead screw (7) passes through the first end plate (4) and is rotatably connected to the second end plate (5); a slide (8) is mounted on the lead screw (7), a second stepper motor (9) is mounted on the slide (8), a synchronous pulley (10) is mounted on the output shaft of the second stepper motor (9), and a synchronous belt (11) that cooperates with the synchronous pulley (10) is mounted on the outside of the external rotor of the high-speed external rotor DC motor (2); the diameter of the synchronous pulley (10) is smaller than the diameter of the synchronous belt (11); The first stepper motor (6) drives the lead screw (7) to rotate, thereby driving the slide (8) to move along the lead screw (7); when the device needs to output high-speed rotation, the slide (8) moves away from the high-speed external rotor DC motor (2), and the high-speed external rotor DC motor (2) directly outputs power; when the device needs to output low-speed rotation or rotate to a certain angle, the high-speed external rotor DC motor (2) stops working, the first stepper motor (6) works, and moves the slide (8) closer to the high-speed external rotor DC motor (2) until the synchronous pulley (10) meshes with the synchronous belt (11). At this time, the second stepper motor (9) starts working, the synchronous pulley (10) drives the synchronous belt (11) to rotate, thereby driving the external rotor of the high-speed external rotor DC motor (2) to rotate, and the high-speed external rotor DC motor (2) completes low-speed rotation or rotates to a certain angle.

2. The high-low speed dual drive mechanism of claim 1, wherein, Limit switches (12) are respectively provided on the first end plate (4) and the second end plate (5).

3. The high-speed and low-speed dual-drive mechanism according to claim 1, characterized in that, A slide rail parallel to the lead screw is fixedly provided between the first end plate (4) and the second end plate (5), and the slide table (8) slides in cooperation with the slide rail.

4. The high-speed and low-speed dual-drive mechanism according to claim 3, characterized in that, The slide rails include a first slide rail (13) and a second slide rail (14) disposed on both sides of the lead screw (7).

5. The high-speed and low-speed dual-drive mechanism according to claim 1, characterized in that, The lead screw (7) is a ball screw.

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