Coaxial differential rotation structure

Abstract

The utility model discloses a coaxial differential rotation structure, which belongs to the technical field of optical detection and comprises a fixed seat, a stepping motor is fixedly connected onto the fixed seat, a driving shaft is fixedly connected to the output end of the stepping motor, a driving platform is fixedly connected to the top end of the driving shaft, and a driven shaft is rotatably connected to the outer surface of the driving shaft. A driven platform is fixedly connected to the top end of the driven shaft, the driving shaft movably penetrates through the driven platform, first gear assemblies are fixedly connected to the outer surfaces of the driven shaft and the driving shaft, an auxiliary shaft is rotationally connected to the fixed seat, a second gear assembly is fixedly connected to the outer surface of the auxiliary shaft, and the second gear assembly is meshed with the first gear assembly; according to the utility model, the whole differential rotation structure is controlled by a single shaft, the structure is simple and compact, the occupied space is small, the control is convenient, and the intensity of reflected light can be effectively measured in a follow-up manner.

Description

Technical Field

[0001] The utility model relates to the technical field of optical detection, and more specifically to a coaxial differential rotation structure. Background Art

[0002] At present, in prism optical experimental lasers, a beam of laser will be refracted and reflected after passing through a prism. The light intensity after being reflected by the bottom surface of the prism at different incident angles varies greatly. For example, when the incident angle increases from 0 to 90 degrees, the reflection angle and the initial angle will increase from 0 to 180 degrees, which is a real-time change of about 2 times. When the laser incident angle changes continuously during the experiment, it is necessary to measure the intensity of the reflected light. Therefore, when performing the intensity measurement of the reflected light, it is necessary to use differential rotation structures with different transmission ratios to meet the measurement requirements. However, in order to achieve different transmission ratios, the existing differential rotation structure usually adopts multi-axis control, and the structure is not compact enough and occupies a large space. For this reason, the utility model proposes a coaxial differential rotation structure. Utility Model Content

[0003] 1. Technical issues to be solved

[0004] In view of the problems existing in the prior art, the purpose of the utility model is to provide a coaxial differential rotation structure, aiming to solve the problem that the differential rotation structure in the prior art usually adopts multi-axis control to achieve different transmission ratios, the structure is not compact enough and occupies a large space.

[0005] 2. Technical solution

[0006] In order to solve the above problems, the utility model adopts the following technical solutions:

[0007] A coaxial differential rotation structure comprises a fixed seat, to which a stepper motor is fixedly connected, an output end of the stepper motor is fixedly connected to a driving shaft, a top end of the driving shaft is fixedly connected to an active platform, an outer surface of the driving shaft is rotatably connected to a driven shaft, a top end of the driven shaft is fixedly connected to the driven platform, and the driving shaft movably penetrates the driven platform, a first gear assembly is fixedly connected to the outer surfaces of the driven shaft and the driving shaft, an auxiliary shaft is rotatably connected to the fixed seat, a second gear assembly is fixedly connected to the outer surface of the auxiliary shaft, and the second gear assembly is meshed with the first gear assembly.

[0008] As a preferred solution of the utility model, the first gear assembly includes a driving gear and a driven gear, the driving gear and the driven gear are fixedly connected to the outer surfaces of the driving shaft and the driven shaft respectively, and the driving shaft movably penetrates the driven gear.

[0009] As a preferred solution of the utility model, the second gear assembly includes an upper auxiliary gear and a lower auxiliary gear, both of which are fixedly connected to the outer surface of the auxiliary shaft, and the upper auxiliary gear and the lower auxiliary gear are respectively meshed with the driven gear and the driving gear.

[0010] As a preferred solution of the utility model, a compensation seat is fixedly connected to the fixed seat, and the auxiliary shaft is rotatably connected to the compensation seat.

[0011] 3. Beneficial effects

[0012] Compared with the prior art, the advantages of the present invention are:

[0013] 1) In this scheme, optical experimental instruments are installed on the active platform and the driven platform, and the stepper motor controls the active shaft to rotate the active platform at a constant speed. During the rotation of the active shaft, the driven shaft is rotated by the engagement of the first gear assembly and the second gear assembly, and the driven shaft drives the driven platform to rotate, so that a speed difference is formed between the driven platform and the active platform, and different transmission ratios are achieved between the active platform and the driven platform, so that the optical experimental instruments on the active platform and the driven platform can perform follow-up measurement of the intensity of reflected light; in the utility model, the entire differential rotation structure adopts single-axis control, the structure is simple and compact, occupies a small space, is easy to control, and can effectively perform follow-up measurement of the intensity of reflected light. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is the front view of the utility model;

[0015] Figure 2 It is a three-dimensional diagram of the utility model;

[0016] Figure 3 It is an exploded view of the utility model;

[0017] Figure 4 It is a cross-sectional view of the utility model.

[0018] Description of the numbers in the figure:

[0019] 1. Fixed seat; 2. Stepper motor; 3. Active shaft; 4. Active platform; 5. Driven shaft; 6. Driven platform; 7. First gear assembly; 71. Active gear; 72. Driven gear; 8. Auxiliary shaft; 9. Second gear assembly; 91. Upper auxiliary gear; 92. Lower auxiliary gear; 10. Compensation seat. DETAILED DESCRIPTION

[0020] The following will clearly and completely describe the technical solutions in the embodiments of the utility model in conjunction with the drawings in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0021] In the description of the present invention, it should be noted that the terms "upper", "lower", "inner", "outer", "top / bottom" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific position, be constructed and operated in a specific position, and therefore cannot be understood as limiting the present invention. In addition, the terms "first" and "second" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0022] In the description of the present utility model, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "provided with", "set / connected", "connected", etc. should be understood in a broad sense. For example, "connected" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0023] Example:

[0024] See also Figure 1-4 A coaxial differential rotation structure includes a fixed base 1, a stepper motor 2 is fixedly connected to the fixed base 1, a driving shaft 3 is fixedly connected to the output end of the stepper motor 2, a driving platform 4 is fixedly connected to the top of the driving shaft 3, a driven shaft 5 is rotatably connected to the outer surface of the driving shaft 3, a driven platform 6 is fixedly connected to the top of the driven shaft 5, and the driving shaft 3 movably passes through the driven platform 6, a first gear assembly 7 is fixedly connected to the outer surfaces of the driven shaft 5 and the driving shaft 3, an auxiliary shaft 8 is rotatably connected to the fixed base 1, a second gear assembly 9 is fixedly connected to the outer surface of the auxiliary shaft 8, and the second gear assembly 9 is meshed with the first gear assembly 7.

[0025] In this embodiment, the stepper motor 2 is electrically connected to an external power supply, and optical experimental instruments are installed on the active platform 4 and the driven platform 6. When the different incident angles of the laser change continuously, the stepper motor 2 starts to control the rotation of the active shaft 3, and the active shaft 3 drives the active platform 4 to rotate. At the same time, the active shaft 3 rotates the first gear assembly 7, and the first gear assembly 7 rotates the second gear assembly 9 through the auxiliary shaft 8. The second gear assembly 9 then controls the rotation of the driven shaft 5 through the first gear assembly 7, and the driven shaft 5 drives the driven platform 6 to rotate, thereby realizing different transmission ratios between the active platform 4 and the driven platform 6. Through different transmission ratios, the optical experimental instruments on the active platform 4 and the driven platform 6 can perform follow-up measurement of the intensity of reflected light.

[0026] Specifically, the first gear assembly 7 includes a driving gear 71 and a driven gear 72 . The driving gear 71 and the driven gear 72 are fixedly connected to the outer surfaces of the driving shaft 3 and the driven shaft 5 , respectively, and the driving shaft 3 movably penetrates the driven gear 72 .

[0027] In this embodiment, the driving gear 71 is located at the lower side of the driven gear 72, and both the driving gear 71 and the driven gear 72 are meshed with the second gear assembly 9. When the stepper motor 2 controls the driving shaft 3 to rotate, the driving shaft 3 drives the driving gear 71 to rotate, the driving gear 71 causes the second gear assembly 9 to rotate, the second gear assembly 9 drives the driven gear 72 to rotate, the driven gear 72 drives the driven shaft 5 to rotate, and the driven shaft 5 drives the driven platform 6 to rotate, thereby realizing different transmission ratios between the driven platform 6 and the driving platform 4.

[0028] Specifically, the second gear assembly 9 includes an upper auxiliary gear 91 and a lower auxiliary gear 92, both of which are fixedly connected to the outer surface of the auxiliary shaft 8, and the upper auxiliary gear 91 and the lower auxiliary gear 92 are respectively meshed with the driven gear 72 and the driving gear 71.

[0029] In this embodiment, the circumference of the driving gear 71 is greater than that of the lower auxiliary gear 92, and the circumference of the upper auxiliary gear 91 is greater than that of the driven gear 72. When the driving gear 71 rotates, the lower auxiliary gear 92 is driven to rotate. The lower auxiliary gear 92 drives the upper auxiliary gear 91 to rotate at the same time through the auxiliary shaft 8, and the upper auxiliary gear 91 drives the driven gear 72 to rotate, thereby generating a speed difference between the driving shaft 3 and the driven shaft 5, and forming different transmission ratios between the driven platform 6 and the driving platform 4.

[0030] Specifically, the fixing seat 1 is fixedly connected to the compensation seat 10 , and the auxiliary shaft 8 is rotatably connected to the compensation seat 10 .

[0031] In this embodiment, the compensation seat 10 is used to compensate for the height of the auxiliary shaft 8 so that the auxiliary shaft 8 can stably mesh the second gear assembly 9 with the first gear assembly 7 .

[0032] Working principle: When the different incident angles of the laser change continuously, the stepper motor 2 starts to control the active shaft 3 to rotate, and the active shaft 3 drives the active platform 4 to rotate. At the same time, the active shaft 3 causes the active gear 71 to rotate. When the active gear 71 rotates, it drives the lower auxiliary gear 92 to rotate. The lower auxiliary gear 92 drives the upper auxiliary gear 91 to rotate at the same time through the auxiliary shaft 8. The upper auxiliary gear 91 drives the driven gear 72 to rotate. The driven gear 72 causes the driven shaft 5 to drive the driven platform 6 to rotate, thereby realizing different transmission ratios between the active platform 4 and the driven platform 6. Through different transmission ratios, the optical experimental instruments on the active platform 4 and the driven platform 6 can perform follow-up measurement of the intensity of reflected light.

[0033] The above is only a preferred specific implementation method of the utility model, but the protection scope of the utility model is not limited thereto. Any technician familiar with the technical field can make equivalent substitutions or changes within the technical scope disclosed by the utility model according to the technical solution and improved ideas of the utility model, which should be included in the protection scope of the utility model.

Claims

1. A coaxial differential rotation structure, comprising a fixed seat (1), characterized in that: The fixing seat (1) is fixedly connected to a stepper motor (2), the output end of the stepper motor (2) is fixedly connected to a driving shaft (3), the top end of the driving shaft (3) is fixedly connected to a driving platform (4), the outer surface of the driving shaft (3) is rotatably connected to a driven shaft (5), the top end of the driven shaft (5) is fixedly connected to a driven platform (6), and the driving shaft (3) movably penetrates the driven platform (6), the driven shaft (5) and the outer surfaces of the driving shaft (3) are fixedly connected to a first gear assembly (7), the fixing seat (1) is rotatably connected to an auxiliary shaft (8), the outer surface of the auxiliary shaft (8) is fixedly connected to a second gear assembly (9), and the second gear assembly (9) is meshed with the first gear assembly (7).

2. The coaxial differential rotation structure according to claim 1, characterized in that: The first gear assembly (7) comprises a driving gear (71) and a driven gear (72), wherein the driving gear (71) and the driven gear (72) are respectively fixedly connected to the outer surfaces of the driving shaft (3) and the driven shaft (5), and the driving shaft (3) movably penetrates the driven gear (72).

3. The coaxial differential rotation structure according to claim 2, characterized in that: The second gear assembly (9) comprises an upper auxiliary gear (91) and a lower auxiliary gear (92), wherein the upper auxiliary gear (91) and the lower auxiliary gear (92) are both fixedly connected to the outer surface of the auxiliary shaft (8), and the upper auxiliary gear (91) and the lower auxiliary gear (92) are respectively meshed with the driven gear (72) and the driving gear (71).

4. The coaxial differential rotation structure according to claim 3, characterized in that: The fixing seat (1) is fixedly connected to a compensation seat (10), and the auxiliary shaft (8) is rotatably connected to the compensation seat (10).

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