Dual-motor micro-motion mechanism with differential structure

Abstract

The utility model discloses a dual-motor micro-motion mechanism with a differential structure. The dual-motor micro-motion mechanism comprises a guide seat, a module vehicle-mounted plate, a dual-row motor and a grating module. The guide base is provided with a channel, guide rails arranged on the two sides of the channel and a grating ruler arranged on one side of the guide base. The module vehicle-mounted plate is connected to the guide rails on the two sides in a sliding mode and stretches across the channel, a nut base is fixed to the bottom face of the module vehicle-mounted plate, the nut base is provided with double nuts distributed in parallel, and threaded holes of the double nuts extend along the channel. The double-row motors are arranged side by side, the double-row motors are in driving connection with lead screws through couplings, and the two lead screws are in threaded connection with the double nuts in a one-to-one mode; the grating module is fixed to the side portion of the guide seat, and a grating head on the grating module is used for reading the grating ruler. According to the double-motor micro-motion mechanism, double lead screws are arranged in parallel to drive the module vehicle-mounted plate to move, a full-closed-loop system formed by high-precision grating position feedback is matched, and high-precision motion with extremely small step pitch is completed.

Description

Technical Field

[0001] This utility model relates to the field of motor drive technology, specifically to a dual-motor micro-motion mechanism with a differential structure. Background Technology

[0002] A differential mechanism is a mechanism that combines two different or independent motions into one motion, or decomposes one motion into two different motions.

[0003] In the field of micro-step adjustment, existing technologies mainly include linear motor drive or piezoelectric ceramic drive. Linear motors are relatively complex to control in the field of micron-level step drive, while piezoelectric ceramic structures generally have limited load capacity.

[0004] Therefore, the existing micro-step adjustment mechanism needs to be improved. Utility Model Content

[0005] To address the shortcomings of existing technologies, the present invention aims to provide a dual-motor micro-motion mechanism with a differential structure. The purpose of designing this dual-motor micro-motion mechanism is twofold: first, to achieve micro-distance adjustment; and second, to precisely control the movement distance of the driven component.

[0006] To solve the above-mentioned technical problems, this utility model provides the following solution: A dual-motor micro-motion mechanism with a differential speed structure, comprising:

[0007] A guide seat, which has a channel and guide rails on both sides of the channel and an optical scale on one side of the guide seat;

[0008] A module vehicle board is slidably connected to the guide rails on both sides and spans the channel. A nut seat is fixed on the bottom surface of the module vehicle board. The nut seat is provided with parallel double nuts and the threaded holes of the double nuts are along the direction of the channel.

[0009] The motors are arranged side by side, and each motor is driven by a lead screw through a coupling. The two lead screws are screwed one-to-one to two nuts.

[0010] A grating module is fixed to the side of the guide seat, and the grating head on it is used to read the grating ruler.

[0011] Furthermore, a coupling mounting base is installed at one end of the channel, and two couplings are arranged side by side on the coupling mounting base. The housing of the double-row motor is fixed to the coupling mounting base.

[0012] Furthermore, the channel is a right-angled U-shaped channel.

[0013] Furthermore, the differential motion of the dual-row motors drives the corresponding lead screw to rotate;

[0014] The two lead screws are of the same specification;

[0015] The two nuts are the same size.

[0016] Compared with the prior art, the beneficial effects of this utility model are: the dual-motor micro-motion mechanism of this utility model uses the parallel arrangement of two lead screws to drive the module vehicle board to move, and then cooperates with a fully closed-loop system composed of high-precision grating position feedback to complete high-precision motion with extremely small step distance.

[0017] The two parallel-moving lead screws are driven by dual motors, which use differential speed to effectively eliminate the error caused by the gap between the lead screw and the nut. The speed difference between the two motors is the actual running speed of the moving parts. By controlling the speed difference and running time, the desired movement distance can be obtained. This invention's dual-motor micro-motion mechanism can achieve extremely short movement steps. Attached Figure Description

[0018] Figure 1 This is an assembly diagram of the dual-motor micro-motion mechanism of this utility model.

[0019] Figure 2 This is a top view of the dual-motor micro-motion mechanism of this utility model.

[0020] Figure 3 This is a structural diagram of the visible lead screw end of this utility model.

[0021] The following components are labeled in the attached diagram: 1. First motor; 2. First lead screw; 3. Second motor; 4. Second lead screw; 5. Module vehicle board; 6. Grating module; 7. Coupling mounting base; 8. Coupling; 9. Guide seat; 10. Nut seat; 11. Guide rail. 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, so that the advantages and features of the present utility model can be more easily understood by those skilled in the art, thereby making a clearer and more definite definition of the protection scope of the present utility model. Obviously, the embodiments described in this utility model 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.

[0023] Furthermore, the technical features involved in the different embodiments of this utility model described below can be combined with each other as long as they do not conflict with each other.

[0024] Example 1: The specific structure of this utility model is as follows:

[0025] Please refer to the appendix. Figure 1-3The present invention discloses a dual-motor micro-motion mechanism with differential structure, comprising a guide seat 9, a module vehicle plate 5, a dual-row motor and a grating module 6.

[0026] The guide seat 9 has a channel and guide rails 11 on both sides of the channel, as well as a grating ruler on one side of the guide seat 9; a coupling fixing seat 7 is installed at one end of the channel, two couplings 8 are arranged side by side on the coupling fixing seat 7, and the housing of the double-row motor is fixed to the coupling fixing seat 7. The channel is a right-angled U-shaped channel. Both sides of the guide seat 9 are provided with outward-facing right-angled slots, and two guide rails 11 are respectively arranged at the two right-angled slots.

[0027] The module vehicle plate 5 is slidably connected to the two side guide rails 11 and spans the channel. The bottom surface of the module vehicle plate 5 is fixed with a nut seat 10. The nut seat 10 is provided with parallel double nuts and the threaded holes of the double nuts are along the channel. The module vehicle plate 5 is a mounting plate that is slidably connected to the two guide rails 11 by a slider. The module vehicle plate 5 can move along the two guide rails 11.

[0028] The two motors are arranged side by side, each driven by a lead screw connected to a coupling 8. The two lead screws are screwed one-to-one onto two nuts. For example... Figure 1 As shown, the dual-row motor includes a first motor 1 and a second motor 3. The first motor 1 is driven and connected to a first lead screw 2 through one set of couplings, and the second motor 3 is driven and connected to a second lead screw 4 through another set of couplings. The first motor 1 and the second motor 4 work synchronously. Both the first lead screw 2 and the second lead screw 4 are ball screws.

[0029] The grating module 6 is fixed to the side of the guide seat 9, and the grating head on it is used to read the grating ruler. The grating ruler is a high-precision grating ruler, which can be read by the grating head to realize the sensing of small distances.

[0030] The differential motion of the dual-row motor drives the corresponding lead screw to rotate; the two lead screws are of the same specification; the two nuts are of the same specification.

[0031] Example 2:

[0032] Because there is a certain gap between the lead screw and the nut, if a conventional set of motors is used to drive a set of lead screws to move the module vehicle plate 5, the micro-movement accuracy of the module vehicle plate 5 will not be high.

[0033] To solve the aforementioned technical problems, the micro-movement of the module vehicle board 5 is achieved by the simultaneous operation of the first lead screw 2 and the second lead screw 4. Specifically, after the first motor 1 and the second motor 3 are powered on, a speed difference is formed, which in turn creates a rotational speed difference between the first lead screw 2 and the second lead screw 4. This speed difference can eliminate the gap error between the lead screw and the nut, and thus the speed difference between the two motors is the running speed of the module vehicle board 5.

[0034] Therefore, by controlling the speed of the two motors to create a speed difference, and then controlling the running time of the two motors, and combining this with the grating head on the grating module 6 to read the grating ruler, the desired micro-motion distance of the module vehicle board 5 can be obtained. Thus, it can be seen that the dual-motor micro-motion mechanism of this utility model can achieve an extremely short movement step.

[0035] The main innovation of this utility model is that the movement of dual motors and dual lead screws eliminates the gap between the lead screw and the nut, thus eliminating the matching error of the lead screw movement. At the same time, the differential speed control of the dual lead screws controls the running distance, and the matching movement time can achieve a smaller running step and higher movement accuracy.

[0036] Example 2:

[0037] The positions of the grating ruler and the grating module 6 can be interchanged.

[0038] In summary, the dual-motor micro-motion mechanism of this utility model utilizes the parallel arrangement of two lead screws to drive the vehicle-mounted module to move, and is combined with a fully closed-loop system composed of high-precision grating position feedback to complete high-precision motion with extremely small step distances.

[0039] The two parallel-moving lead screws are driven by dual motors, which use differential speed to effectively eliminate the error caused by the gap between the lead screw and the nut. The speed difference between the two motors is the actual running speed of the moving parts. By controlling the speed difference and running time, the desired movement distance can be obtained. This invention's dual-motor micro-motion mechanism can achieve extremely short movement steps.

[0040] The above description is only a preferred embodiment of the present utility model and does not limit the patent scope of the present utility model. Any equivalent structural or procedural transformations made based on the contents of the present utility model specification and drawings, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of the present utility model.

Claims

1. A dual-motor micro-motion mechanism with a differential speed structure, characterized in that, include: Guide seat (9), the guide seat (9) has a channel and guide rails (11) on both sides of the channel and a grating ruler on one side of the guide seat (9); A module vehicle plate (5) is slidably connected to the guide rails (11) on both sides and spans the channel. A nut seat (10) is fixed on the bottom surface of the module vehicle plate (5). The nut seat (10) is provided with parallel double nuts and the threaded holes of the double nuts are along the channel. The two motors are arranged side by side. Each motor is driven by a lead screw connected to a coupling (8). The two lead screws are screwed one-to-one to two nuts. A grating module (6) is fixed to the side of the guide seat (9), and the grating head on it is used to read the grating ruler.

2. The dual-motor micro-motion mechanism with differential structure according to claim 1, characterized in that, A coupling mounting base (7) is installed at one end of the channel, and two couplings (8) are arranged side by side on the coupling mounting base (7). The housing of the double-row motor is fixed to the coupling mounting base (7).

3. The dual-motor micro-motion mechanism with differential structure according to claim 1, characterized in that, The channel is a right-angled U-shaped channel.

4. The dual-motor micro-motion mechanism with differential structure according to claim 1, characterized in that, The differential motion of the dual-row motor drives the corresponding lead screw to rotate; The two lead screws are of the same specification; The two nuts are the same size.

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