Double-layer tower wheel multi-grating on-axis rotation module and spectrometer

Abstract

The present invention is a double-layer tower wheel multi-grating on-axis rotation module and a spectrometer, the module comprising: a grating tower assembly, the grating tower assembly comprising a tower base and a plurality of grating components located on the tower base; a first rotating assembly, the tower base is connected to the first rotating assembly, the rotation axis of the first rotating assembly and the central axis of the plurality of grating components are on the same vertical straight line, and the grating tower assembly is driven to rotate by the first rotating assembly; a second rotating assembly, the first rotating assembly is connected to the second rotating assembly; in the horizontal direction, the distance between the rotation axis of the second rotating assembly and the rotation axis of the first rotating assembly is equal to the distance between the rotation axis of the first rotating assembly and the grating component, so that the grating component receiving light and the rotation axis of the second rotating assembly are located on the same vertical straight line, and the first rotating assembly is driven to rotate by the second rotating assembly. The present invention solves the technical problem that the grating rotation axis center of the multi-grating spectrometer deviates, thereby affecting the efficiency of grating use.

Description

Technical Field

[0001] The invention relates to the technical field of spectrometer light splitting, and in particular to a double-layer tower wheel multi-grating on-axis rotation module and a spectrometer. Background Art

[0002] A spectrometer is a scientific instrument that uses a dispersion element to decompose complex light into required wavelengths or wavelength regions, and measures the intensity at a selected wavelength (or scans a certain band). In order to better utilize the advantage of the spectrometer's ability to cover the full spectrum range and to more flexibly select the spectral range and resolution, a multi-grating tower is needed to meet the design requirements.

[0003] At present, multi-grating towers are mostly designed using the "prism" principle, in which the rotation axis of the grating is designed to be at the center point of the "prism", which causes the rotation axis of the grating to deviate. The larger the light-transmitting area of ​​the grating, the farther the actual rotation axis of the grating is from the theoretical rotation axis, and the greater the impact on the efficiency of the grating.

[0004] In the related art, a multi-grating spectrometer has a problem that the grating rotation axis deviates, thereby affecting the efficiency of grating use.

[0005] Therefore, the inventor, relying on many years of experience and practice in related industries, proposes a double-layer tower wheel multi-grating on-axis rotation module and a spectrometer to overcome the defects of the prior art. Summary of the invention

[0006] The purpose of the present invention is to provide a double-layer tower wheel multi-grating on-axis rotation module and a spectrometer, which can avoid the deviation of the grating rotation axis, realize the on-axis rotation of the grating, effectively improve the use efficiency of the grating, and improve the instrument performance of the spectrometer under the same conditions.

[0007] The purpose of the present invention can be achieved by adopting the following scheme:

[0008] The present invention provides a double-layer tower wheel multi-grating on-axis rotating module, and the double-layer tower wheel multi-grating on-axis rotating module comprises:

[0009] A grating tower assembly, the grating tower assembly comprising a tower base and a plurality of grating components with different spectral resolutions, the plurality of grating components are vertically arranged on the top surface of the tower base, and the plurality of grating components are arranged in coordination to form a multi-prism structure;

[0010] A first rotating assembly, wherein the first rotating assembly is disposed below the grating tower assembly, the bottom surface of the tower base is connected to the top of the first rotating assembly, the rotating axis of the first rotating assembly and the central axes of the plurality of grating components are on the same vertical straight line, and the grating tower assembly is driven to rotate by the first rotating assembly to change the grating component that receives light;

[0011] a second rotating assembly, the second rotating assembly being arranged below the first rotating assembly, the bottom of the first rotating assembly being connected to the top of the second rotating assembly, and the rotating axis of the second rotating assembly being staggered with the rotating axis of the first rotating assembly in the vertical direction;

[0012] In the horizontal direction, the distance between the rotation axis of the second rotating component and the rotation axis of the first rotating component is equal to the distance between the rotation axis of the first rotating component and the grating component, so that the grating component receiving light and the rotation axis of the second rotating component are located on the same vertical straight line, and the first rotating component is driven to rotate by the second rotating component.

[0013] In a preferred embodiment of the present invention, the grating tower assembly also includes a tower body, the bottom of the tower body is connected to the top surface of the tower base, and a plurality of grating brackets are arranged on the outer wall of the tower body and along its circumference, and the plurality of grating brackets correspond one-to-one to the plurality of grating parts, and the plurality of grating parts are respectively detachably connected to the corresponding grating brackets.

[0014] In a preferred embodiment of the present invention, the tower body is a vertically arranged cylindrical structure, a tower cover is provided on the top of the tower body, the rotating shaft of the first rotating component passes through the tower base support from bottom to top and extends into the interior of the tower body, and the first rotating component is connected to the bottom surface of the tower base support to drive the tower body to rotate through the first rotating component.

[0015] In a preferred embodiment of the present invention, the first rotating assembly includes a base plate, a first column is disposed at the top center of the base plate, the first column is a vertically disposed hollow columnar structure, the bottom of the first column is connected to the base plate, and the first column passes through the tower base support from bottom to top and extends into the interior of the tower body;

[0016] A first worm gear is disposed on the top of the base plate, and the first worm gear is rotatably sleeved on the outer circumference of the first column. The tower base is located above the first worm gear, and the bottom surface of the tower base is connected to the top surface of the first worm gear.

[0017] A first motor and a first worm are provided on one side of the first worm wheel, the output shaft of the first motor is connected to one end of the first worm wheel, the teeth on the first worm wheel are meshed with the teeth on the first worm wheel, so that the first motor drives the first worm wheel to rotate.

[0018] In a preferred embodiment of the present invention, the first rotating assembly further includes a first central rotating shaft, the bottom end of the first central rotating shaft is connected to the first worm gear, and the first central rotating shaft passes through the bottom opening of the first column from bottom to top and extends into the first column;

[0019] A first angular contact ball bearing is arranged between the first central rotating shaft and the inner wall of the first column.

[0020] In a preferred embodiment of the present invention, the first motor is disposed on the substrate.

[0021] In a preferred embodiment of the present invention, the second rotating assembly includes a base disposed on the mounting table, a rotatable tray is disposed above the base, a second worm gear is disposed on the top of the tray, a top surface of the second worm gear is connected to a bottom surface of a connecting plate, and a top surface of the connecting plate is connected to the bottom of the base plate;

[0022] A second motor and a second worm are provided on one side of the second worm gear, an output shaft of the second motor is connected to one end of the second worm gear, teeth on the second worm gear are meshed with teeth on the second worm gear, so that the second worm gear is driven to rotate by the second motor.

[0023] In a preferred embodiment of the present invention, the top center of the tray protrudes upward to form a second column, the second worm gear is sleeved on the outer circumference of the second column, and the second worm gear is connected to the tray by bolts;

[0024] A connecting plate is sleeved on the outer periphery of the second column. The connecting plate is located between the top surface of the second worm gear and the bottom surface of the base plate. The second worm gear and the base plate are connected via the connecting plate.

[0025] In a preferred embodiment of the present invention, the second rotating assembly also includes a worm bracket arranged on the mounting table, the second worm is rotatably arranged on the worm bracket, and one end of the second worm is connected to the output shaft of the second motor through a coupling.

[0026] In a preferred embodiment of the present invention, the second rotating assembly further comprises a second central rotating shaft, the base has a mounting hole extending vertically, the second central rotating shaft is rotatably disposed in the mounting hole, the top end of the second central rotating shaft extends out from the top opening of the mounting hole and is connected to the bottom surface of the tray;

[0027] A second angular contact ball bearing is arranged between the second central rotating shaft and the inner wall of the mounting hole.

[0028] In a preferred embodiment of the present invention, the distance between the axis of the first central rotating shaft and the axis of the second central rotating shaft is equal to the distance between the axis of the first central rotating shaft and the vertical center line of the grating element.

[0029] In a preferred embodiment of the present invention, the second rotating assembly also includes a limit pin and a tension spring, the limit pin is arranged on the mounting table, one end of the tension spring is connected to the limit pin, and the other end of the tension spring is connected to the tray to limit the rotation range of the second worm gear.

[0030] In a preferred embodiment of the present invention, the second rotating assembly further includes a first photoelectric sensor, and the first photoelectric sensor is used to collect light signals to determine the rotation angle of the second worm gear.

[0031] In a preferred embodiment of the present invention, a plurality of light-transmitting holes are arranged on the first worm wheel near the edge, the plurality of light-transmitting holes correspond to the plurality of grating elements one by one, and the plurality of light-transmitting holes are distributed at intervals along the circumference of the first worm wheel;

[0032] The first rotating assembly also includes a second photoelectric sensor disposed on the mounting table, the second photoelectric sensor is located on one side of the first worm gear, and the second photoelectric sensor is used to collect corresponding light signals when the plurality of light-transmitting holes rotate to positions relative to the second photoelectric sensor in sequence.

[0033] In a preferred embodiment of the present invention, the number of the grating elements is three, and among the three grating elements, the grating element located on the same vertical line as the rotation axis of the second rotating component is opposite to the incident direction of the light.

[0034] The present invention provides a spectrometer, which comprises the above-mentioned double-layer tower wheel multi-grating on-axis rotating module.

[0035] As described above, the characteristics and advantages of the double-layer tower wheel multi-grating on-axis rotation module and spectrometer of the present invention are:

[0036] According to actual needs, multiple grating components with different spectral resolutions are vertically arranged on the top surface of the tower base, and the multiple grating components are arranged in coordination to form a multi-prism structure, so that different grating components can be switched during the subsequent rotation process; the bottom surface of the tower base is connected to the top of the first rotating component, and the grating tower component can be driven by the first rotating component to rotate with the rotation axis of the first rotating component as the central axis. Since the rotation axis of the first rotating component and the central axis of the multiple grating components are on the same vertical straight line, the grating tower component can realize the switching of the grating components at the position where light can be received during the rotation of the first rotating component, thereby changing the grating components with different spectral resolutions to receive light according to actual needs;

[0037] In addition, in the present application, the bottom of the first rotating component is connected to the top of the second rotating component, the rotating axis of the second rotating component is staggered with the rotating axis of the first rotating component in the vertical direction, and in the horizontal direction, the distance between the rotating axis of the second rotating component and the rotating axis of the first rotating component is equal to the distance between the rotating axis of the first rotating component and the grating element, so that the grating element receiving light and the rotating axis of the second rotating component are located on the same vertical straight line, so that the first rotating component can be driven to rotate by the second rotating component, and the angle of the grating element can be adjusted to achieve the purpose of driving the wavelength of the corresponding grating element to scan on the optical axis. The present application can always keep the grating element receiving light and the rotating axis of the second rotating component on the same vertical straight line through the cooperation of the above-mentioned multiple grating elements, the first rotating component and the second rotating component, so as to avoid the deviation of the grating rotation axis, realize the on-axis rotation of the grating, and effectively improve the use efficiency of the grating. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] The following drawings are intended only to illustrate and explain the present invention, and do not limit the scope of the present invention.

[0039] Figure 1 : It is a three-dimensional diagram of the double-layer tower wheel multi-grating on-axis rotation module of the present invention.

[0040] Figure 2 : It is a front view cross-sectional view of the double-layer tower wheel multi-grating on-axis rotation module of the present invention.

[0041] Figure 3 : It is the action principle diagram of the double-layer tower wheel multi-grating on-axis rotation module of the present invention.

[0042] Figure 4 : This is a schematic diagram of the off-axis rotation of the grating in the prior art.

[0043] Figure 5 : It is a schematic diagram of the grating on-axis rotation in the double-layer tower wheel multi-grating on-axis rotation module of the present invention.

[0044] The accompanying drawings in the present invention are:

[0045] 1. Grating tower assembly; 101. Grating parts;

[0046] 1011, vertical center line; 102, tower base;

[0047] 103. Tower body; 104. Grating bracket;

[0048] 105. Tower cover; 2. First rotating assembly;

[0049] 201, substrate; 202, first worm gear;

[0050] 2022, light-transmitting hole; 203, first motor;

[0051] 204. a first worm; 205. a first cylinder;

[0052] 206. a first central rotating shaft; 207. a first angular contact ball bearing;

[0053] 208. A second photoelectric sensor; 3. A second rotating assembly;

[0054] 301, base; 3011, mounting hole;

[0055] 302, tray; 3021, second column;

[0056] 303. second worm gear; 304. connecting plate;

[0057] 305. A second central rotating shaft; 306. A second angular contact ball bearing;

[0058] 307, a second motor; 308, a second worm;

[0059] 309, coupling; 310, worm support;

[0060] 311, limit pin; 312, tension spring;

[0061] 313. The first photoelectric sensor; 4. Install the table. DETAILED DESCRIPTION

[0062] In order to have a clearer understanding of the technical features, purposes and effects of the present invention, specific embodiments of the present invention are now described with reference to the accompanying drawings.

[0063] Implementation Method 1

[0064] like Figures 1 to 3As shown, the present invention provides a double-layer tower wheel multi-grating on-axis rotation module, which includes a grating tower assembly 1, a first rotating assembly 2 and a second rotating assembly 3. The grating tower assembly 1 includes a tower base 102 and a plurality of grating components 101 with different spectral resolutions. The plurality of grating components 101 are vertically arranged on the top surface of the tower base 102, and the plurality of grating components 101 are arranged around its periphery with a vertical straight line (which may be the central axis of the tower base 102) as the central axis, so that the plurality of grating components 101 are arranged in coordination to form a multi-prism structure; the first rotating assembly 2 is arranged below the grating tower assembly 1, the bottom surface of the tower base 102 is connected to the top of the first rotating assembly 2, and the rotating axis of the first rotating assembly 2 is connected to the central axis of the plurality of grating components 101 (i.e., located between the plurality of grating components 101 and the central axis of the plurality of grating components 101). The vertical straight line at the center position of the grating member 101, which is also the central axis of the tower base 102, is on the same vertical straight line, and the grating tower assembly 1 is driven to rotate by the first rotating assembly 2 to change the grating member 101 that receives light; the second rotating assembly 3 is arranged below the first rotating assembly 2, the bottom of the first rotating assembly 2 is connected to the top of the second rotating assembly 3, and the rotation axis of the second rotating assembly 3 is staggered with the rotation axis of the first rotating assembly 2 in the vertical direction; in the horizontal direction, the distance between the rotation axis of the second rotating assembly 3 and the rotation axis of the first rotating assembly 2 is equal to the distance between the rotation axis of the first rotating assembly 2 and the grating member 101, so that the grating member 101 that receives light and the rotation axis of the second rotating assembly 3 are located on the same vertical straight line, and the first rotating assembly 2 is driven to rotate by the second rotating assembly 3.

[0065] In the present invention, the grating member 101 may be, but is not limited to, a vertically arranged grating plate.

[0066] According to the present invention, multiple grating components 101 with different spectral resolutions are vertically arranged on the top surface of the tower base 102 according to actual needs, and the multiple grating components 101 are arranged in coordination to form a multi-prism structure, wherein each surface of the multi-prism structure corresponds to a grating component 101, so that different grating components 101 can be switched between in the subsequent rotation process to meet the use requirements of different spectral resolutions; the bottom surface of the tower base 102 is connected to the top of the first rotating component 2, and the grating tower component 1 can be driven by the first rotating component 2 to rotate with the rotation axis of the first rotating component 2 as the central axis. Since the rotation axis of the first rotating component 2 and the central axis of the multiple grating components 101 are on the same vertical straight line, the vertical center lines 1011 of the multiple grating components 101 are at the same distance from the rotation axis of the first rotating component 2. During the rotation of the grating tower component 1 with the first rotating component 2, the switching of the grating components 101 at the position where light can be received can be realized, thereby changing the grating components 1 with different spectral resolutions according to actual needs. 01 to receive light; in addition, in the present application, the bottom of the first rotating component 2 is connected to the top of the second rotating component 3, the rotation axis of the second rotating component 3 is staggered with the rotation axis of the first rotating component 2 in the vertical direction, and in the horizontal direction, the distance between the rotation axis of the second rotating component 3 and the rotation axis of the first rotating component 2 is equal to the distance between the rotation axis of the first rotating component 2 and the grating component 101, so that the grating component 101 receiving light and the rotation axis of the second rotating component 3 are located on the same vertical straight line, so that the first rotating component 2 can be driven to rotate by the second rotating component 3, and the angle of the grating component 101 can be adjusted to achieve the purpose of driving the wavelength of the corresponding grating component 101 to scan on the optical axis. The present application can always keep the grating component 101 receiving light and the rotation axis of the second rotating component 3 on the same vertical straight line through the cooperation of the above-mentioned multiple grating components 101, the first rotating component 2 and the second rotating component 3, so as to avoid the deviation of the grating rotation axis, realize the on-axis rotation of the grating, and effectively improve the use efficiency of the grating.

[0067] In a specific embodiment of the present invention, Figures 1 to 3 As shown, there are three grating elements 101, and the three grating elements 101 are arranged together to form a triangular prism structure. Among the three grating elements 101, the grating element 101 located on the same vertical line as the rotation axis of the second rotating component 3 is opposite to the incident direction of the light, so that during use, the wavelength of the corresponding grating element 101 is scanned on the optical axis.

[0068] In an optional embodiment of the present invention, Figures 1 to 3As shown, the grating tower assembly 1 also includes a tower body 103, which serves as a bearing structure for multiple grating components 101. The bottom of the tower body 103 is fixedly connected to the top surface of the tower base 102 by multiple bolts. Multiple grating brackets 104 are evenly arranged on the outer wall of the tower body 103 and spaced along its circumference. The multiple grating brackets 104 correspond to the multiple grating components 101 one by one, and the multiple grating components 101 are detachably connected to the corresponding grating brackets 104. Among them, the grating bracket 104 can adopt an action component that can swing up and down or left and right, and the grating component 101 is connected to the action component, so that the pitch angle and left and right yaw angle of the grating component 101 can be adjusted. The action component in this application adopts a structural component used for installation in an existing spectrometer, and its specific structure is not limited here. Of course, other devices with multi-axis movement functions (such as a multi-axis mechanical arm) can also be used to adjust the pitch angle and yaw angle of the grating component 101.

[0069] Specifically, Figure 1 , Figure 2 As shown, the tower base 102 is a disc-shaped structure arranged horizontally, and the tower body 103 is a cylindrical structure arranged vertically. The tower base 102 and the tower body 103 are arranged coaxially, and a tower cover 105 is fixedly arranged on the top of the tower body 103. The rotating axis of the first rotating component 2 passes through the tower base 102 from bottom to top and extends into the interior of the tower body 103. The first rotating component 2 is connected to the bottom surface of the tower base 102 to drive the tower body 103 to rotate through the first rotating component 2.

[0070] In an optional embodiment of the present invention, Figures 1 to 3 As shown, the first rotating assembly 2 includes a base plate 201, which is a circular plate-shaped structure arranged in the horizontal direction. A first column 205 is arranged at the top center of the base plate 201. The first column 205 is a hollow cylindrical structure arranged vertically. The bottom of the first column 205 is fixedly connected to the base plate 201 by a plurality of bolts. When the first rotating assembly 2 and the grating tower assembly 1 are assembled, the first column 205 can pass through the tower base support 102 from bottom to top and extend into the interior of the tower body 103; the top of the base plate 201 A first worm gear 202 is provided, and the first worm gear 202 can be rotatably mounted on the outer periphery of the first column 205. The first worm gear 202 is rotatable relative to the base plate 201. The tower base support 102 is located above the first worm gear 202, and the bottom surface of the tower base support 102 and the top surface of the first worm gear 202 can be connected through a positioning pin, so that when the first worm gear 202 rotates, the first worm gear 202 can drive the tower base support 102 to rotate synchronously, and then drive multiple grating components 101 to rotate, thereby realizing the switching of different grating components 101.

[0071] Further, such as Figure 1 , Figure 3 As shown, a first motor 203 and a first worm 204 are arranged on a substrate 201 and on one side of a first worm gear 202, the output shaft of the first motor 203 is connected to one end of the first worm 204, the other end of the first worm 204 or the outer wall near the other end is provided with teeth, and the teeth on the first worm 204 are meshed with the teeth on the annular outer edge of the first worm gear 202, so that the first worm 204 is driven to rotate through the output shaft of the first motor 203, and then the first worm gear 202 is driven to rotate through the first worm 204, thereby providing power for the switching of the grating member 101.

[0072] Further, such as Figure 2 As shown, the first rotating assembly 2 also includes a first central rotating shaft 206 arranged vertically, the bottom end of the first central rotating shaft 206 is fixedly connected to the center position of the first worm gear 202, the first central rotating shaft 206 passes through the bottom opening of the first column 205 from bottom to top and extends into the first column 205, and a first angular contact ball bearing 207 is arranged between the first central rotating shaft 206 and the inner wall of the first column 205 to ensure the stable rotation of the first central rotating shaft 206. The first central rotating shaft 206 is the rotating shaft of the first rotating assembly 2 mentioned above.

[0073] Preferably, Figure 2 As shown, there are two first angular contact ball bearings 207 , which are respectively located at the upper and lower parts of the first central rotating shaft 206 , thereby ensuring stable rotation of the first central rotating shaft 206 and improving rotation accuracy.

[0074] In the above-mentioned embodiment of the present application, the base plate 201, the first worm gear 202, the first column 205, the first central rotating shaft 206, the tower base 102 and the tower body 103 are coaxially arranged.

[0075] In an optional embodiment of the present invention, Figures 1 to 3 As shown, the second rotating assembly 3 includes a base 301 arranged on the mounting table 4, a rotatable tray 302 is arranged above the base 301, the tray 302 is a disc-shaped structure arranged in the horizontal direction, and a second worm gear 303 is arranged on the top of the tray 302. The top surface of the second worm gear 303 is connected to the bottom surface of the connecting plate 304 by a plurality of bolts, and the top surface of the connecting plate 304 is connected to the bottom of the base plate 201. When the second worm gear 303 rotates, the second worm gear 303 can drive the connecting plate 304 and the base plate 201 to rotate synchronously, thereby driving the grating tower assembly 1 and the first rotating assembly 2 to rotate as a whole, so as to achieve the purpose of driving the wavelength of the corresponding grating member 101 on the grating tower assembly 1 to scan on the optical axis.

[0076] Further, such as Figure 1 , Figure 3As shown, a second motor 307 and a second worm 308 are arranged on the mounting table 4 and on one side of the second worm gear 303, the output shaft of the second motor 307 is connected to one end of the second worm 308, and teeth are arranged on the other end of the second worm 308 or on the outer wall near the other end, and the teeth on the second worm 308 are meshed with the teeth on the annular outer edge of the second worm gear 303, so that the second worm 308 is driven to rotate by the second motor 307, and then the second worm gear 303 is driven to rotate by the second worm 308, so as to provide driving force for the grating member 101 to scan on the optical axis.

[0077] Specifically, Figure 2 As shown, a second column 3021 is vertically arranged and protrudes upward at the top center position of the tray 302. The second worm gear 303 is sleeved on the outer periphery of the second column 3021, and the second worm gear 303 and the tray 302 are connected by bolts. A connecting plate 304 is also sleeved on the outer periphery of the second column 3021, and the connecting plate 304 is located between the top surface of the second worm gear 303 and the bottom surface of the base plate 201, and the second worm gear 303 and the base plate 201 are connected by the connecting plate 304.

[0078] Further, such as Figure 3 As shown, the second rotating component 3 also includes a worm bracket 310 arranged on the mounting table 4, both ends of the second worm 308 are rotatably arranged on the worm bracket 310, and one end of the second worm 308 is connected to the output shaft of the second motor 307 through a coupling 309. The worm bracket 310 provides rotational support for the second worm 308, and the coupling 309 realizes stable connection and transmission between the second motor 307 and the second worm 308.

[0079] Further, such as Figure 2 As shown, the second rotating assembly 3 also includes a second central rotating shaft 305 arranged vertically, and the base 301 has a mounting hole 3011 extending vertically, and the second central rotating shaft 305 is rotatably arranged in the mounting hole 3011, and the top end of the second central rotating shaft 305 extends out from the top opening of the mounting hole 3011 and is connected to the bottom surface of the tray 302; a second angular contact ball bearing 306 is arranged between the second central rotating shaft 305 and the inner wall of the mounting hole 3011. The base 301 and the second central rotating shaft 305 cooperate to provide rotation support for the entire double-layer tower wheel multi-grating on-axis rotating module.

[0080] Preferably, Figure 2 As shown, there are two second angular contact ball bearings 306 , which are respectively located at the upper and lower parts of the second central rotating shaft 305 , thereby ensuring stable rotation of the second central rotating shaft 305 and improving rotation accuracy.

[0081] In the above embodiment, the distance between the axis of the first central rotation axis 206 and the axis of the second central rotation axis 305 is equal to the distance between the axis of the first central rotation axis 206 and the vertical center line 1011 of the grating element 101. Figure 1 The vertical center line of the middle grating member 101 in the length direction makes the second rotating assembly 3 drive the first rotating assembly 2 to rotate, for example Figure 3 When the first rotating component 2 rotates from the first position to the second position, the grating component 101 that receives light only rotates along its vertical center line 1011, and the vertical center line 1011 of the grating component 101 that receives light is always located on the same vertical straight line as the rotation axis of the second rotating component 3 (i.e., the central axis of the second central rotation axis 305), thereby ensuring the on-axis rotation of the grating component 101, effectively improving the use efficiency of the grating component 101, and further achieving the effect of improving the instrument performance of the spectrometer under the same conditions.

[0082] In the above-mentioned embodiment of the present application, the second central rotating shaft 305 , the tray 302 , the second worm gear 303 , and the second cylinder 3021 are coaxially arranged.

[0083] In an optional embodiment of the present invention, Figure 1 As shown, the second rotating assembly 3 also includes a limit pin 311 and a tension spring 312. The limit pin 311 is fixedly arranged on the mounting table 4. The tension spring 312 extends in the horizontal direction. One end of the tension spring 312 is connected to the limit pin 311, and the other end of the tension spring 312 is connected to the edge of the tray 302. When the tray 302 and the second worm gear 303 rotate synchronously, the rotation range of the second worm gear 303 can be limited by the tension spring 312 to ensure that the grating member 101 completes the scanning operation within the rotation range. In addition, the tension of the tension spring 312 on the tray 302 can also eliminate the meshing gap (i.e., the return gap) between the second worm gear 303 and the second worm 308 when the second worm gear 303 is reset (i.e., the second worm gear 303 needs to be restored to the preset starting position before rotation), thereby ensuring the stable meshing relationship between the second worm gear 303 and the second worm 308, thereby achieving the purpose of stable transmission.

[0084] In an optional embodiment of the present invention, Figure 1As shown, the second rotating assembly 3 also includes a first photoelectric sensor 313. The first photoelectric sensor 313 can be arranged on the base 301. The tray 302 is provided with a light-transmitting hole corresponding to the first photoelectric sensor 313. When the tray 302 rotates to a position where the light-transmitting hole thereon is opposite to the first photoelectric sensor 313, light passes through the light-transmitting hole and is received by the first photoelectric sensor 313. The first photoelectric sensor 313 can be used to collect light signals. The collected light signals can be analyzed to determine the rotation angle of the second worm gear 303, which can be used to locate the grating wavelength scanning range. Of course, the setting positions of the first photoelectric sensor 313 and the light-transmitting hole are also swapped, that is, the first photoelectric sensor 313 is set on the tray 302, and the light-transmitting hole is set on the base 301.

[0085] In an optional embodiment of the present invention, Figure 1 , Figure 2 As shown, a plurality of light-transmitting holes 2022 are arranged on the first worm gear 202 and near the edge thereof, the plurality of light-transmitting holes 2022 correspond one-to-one to the plurality of grating elements 101, and the plurality of light-transmitting holes 2022 are spaced and evenly distributed along the circumference of the first worm gear 202; the first rotating assembly 2 also includes a second photoelectric sensor 208 arranged on the mounting table 4, the second photoelectric sensor 208 is located on one side of the first worm gear 202, during the rotation of the first worm gear 202, when the light-transmitting hole 2022 rotates to the position of the second photoelectric sensor 208, light passes through the light-transmitting hole 2022 and is received by the second photoelectric sensor 208, and the second photoelectric sensor 208 can obtain the rotation speed of the first worm gear 202 and the position of different grating elements 101 through the received light signal and the time difference between the two adjacent light signals being received, thereby being used for switching and positioning different grating elements 101. The second photoelectric sensor 208 can collect corresponding light signals when the plurality of light-transmitting holes 2022 rotate to positions opposite thereto in sequence, thereby knowing the rotation position of each grating element 101 to achieve the purpose of grating switching positioning.

[0086] In a comparative example of the present invention, Figure 4 As shown in FIG. 1 , when the grating element 101 performs off-axis rotation (i.e., the plurality of grating elements 101 rotate about a vertical line located at the center of the plurality of grating elements 101 as the rotation axis), the grating element 101 is rotated by Figure 4 When the realization position in the figure is rotated to the dotted line position, the rotation axis of the grating element 101 itself (i.e. the vertical center line 1011 of the grating element 101) located at the light receiving position will deviate, resulting in a decrease in the light passing area of ​​the grating element 101 and a decrease in the use efficiency of the grating element 101; Figure 5 As shown, when the grating element 101 of the present application is rotated on the axis, the grating element 101 is Figure 5When the realized position in the figure is rotated to the dotted line position, the rotation axis of the grating element 101 located at the light receiving position (i.e., the vertical center line 1011 of the grating element 101 mentioned above) will not deviate, and the grating element 101 located at the light receiving position rotates about its own rotation axis, so that the grating element 101 always maintains a constant light-transmitting area. It can be seen that compared with the off-axis rotation method of the grating element 101, the double-layer tower wheel multi-grating on-axis rotation module of the present application can improve the utilization efficiency of the grating element 101.

[0087] The characteristics and advantages of the double-layer tower wheel multi-grating on-axis rotation module of the present invention are:

[0088] 1. In the double-layer tower wheel multi-grating on-axis rotation module, through the cooperation of multiple grating components 101, the first rotating component 2 and the second rotating component 3, even when switching different grating components 101, the rotation axis of the grating component 101 that receives light and the second rotating component 3 can be kept on the same vertical straight line, thereby avoiding the problem of deviation of the rotation axis in the existing spectrometer with multiple gratings, realizing the on-axis rotation of the grating, and effectively improving the use efficiency of the grating.

[0089] 2. In the double-layer tower wheel multi-grating axis rotation module, the first rotating component 2 and the second rotating component 3 both adopt the cooperation mode of worm gear and worm kneading to realize the rotation drive of the grating tower component 1, and the structural stability is strong. At the same time, it also reduces the difficulty of step length calculation using multiple driving modes, and the operation is simpler.

[0090] 3. In the double-layer tower wheel multi-grating axis rotation module, the first rotating component 2 and the second rotating component 3 are driven to rotate by a worm gear and a worm kneading method, and the assembly of the central rotating shaft is achieved through paired angular contact ball bearings to ensure higher stability and rotation accuracy during the rotation process.

[0091] 4. In the double-layer tower wheel multi-grating axis rotation module, the first rotating component 2 and the second rotating component 3 can respectively realize rotation detection and positioning through the corresponding photoelectric sensors, with high positioning accuracy; in addition, the second rotating component 3 uses a tension spring 312 to limit the rotation range of the second rotating component 3, that is, the wavelength scanning range is limited, which can play a role in coarse limiting and misplacement, and the tension spring 312 can also eliminate the gap between the second worm wheel 303 and the second worm 308, to ensure the stable meshing relationship between the second worm wheel 303 and the second worm 308, thereby achieving the purpose of stable transmission.

[0092] Implementation Method 2

[0093] The invention provides a spectrometer, which has the above-mentioned double-layer tower wheel multi-grating on-axis rotation module.

[0094] The spectrometer of the present invention has the same characteristics and advantages as the above-mentioned double-layer tower wheel multi-grating on-axis rotation module, which will not be described in detail here.

[0095] The above description is only an illustrative embodiment of the present invention and is not intended to limit the scope of the present invention. Any equivalent changes and modifications made by any person skilled in the art without departing from the concept and principle of the present invention shall fall within the scope of protection of the present invention.

Claims

1. A double-layer tower wheel multi-grating on-axis rotating module, characterized in that: The double-layer tower wheel multi-grating on-axis rotation module comprises: A grating tower assembly, the grating tower assembly comprising a tower base and a plurality of grating components with different spectral resolutions, the plurality of grating components are vertically arranged on the top surface of the tower base, and the plurality of grating components are arranged in coordination to form a multi-prism structure; A first rotating assembly, wherein the first rotating assembly is disposed below the grating tower assembly, the bottom surface of the tower base is connected to the top of the first rotating assembly, the rotating axis of the first rotating assembly and the central axes of the plurality of grating components are on the same vertical straight line, and the grating tower assembly is driven to rotate by the first rotating assembly to change the grating component that receives light; a second rotating assembly, the second rotating assembly being arranged below the first rotating assembly, the bottom of the first rotating assembly being connected to the top of the second rotating assembly, and the rotating axis of the second rotating assembly being staggered with the rotating axis of the first rotating assembly in the vertical direction; In the horizontal direction, the distance between the rotation axis of the second rotating component and the rotation axis of the first rotating component is equal to the distance between the rotation axis of the first rotating component and the grating component, so that the grating component receiving light and the rotation axis of the second rotating component are located on the same vertical straight line, and the first rotating component is driven to rotate by the second rotating component.

2. The double-layer tower wheel multi-grating on-axis rotating module as claimed in claim 1, characterized in that: The grating tower assembly also includes a tower body, the bottom of which is connected to the top surface of the tower base, and a plurality of grating brackets are arranged on the outer wall of the tower body and along its circumference, the plurality of grating brackets correspond one-to-one to the plurality of grating parts, and the plurality of grating parts are respectively detachably connected to the corresponding grating brackets.

3. The double-layer tower wheel multi-grating on-axis rotating module as claimed in claim 2, characterized in that: The tower body is a vertically arranged cylindrical structure, and a tower cover is provided on the top of the tower body. The rotating shaft of the first rotating component passes through the tower base from bottom to top and extends into the interior of the tower body. The first rotating component is connected to the bottom surface of the tower base to drive the tower body to rotate through the first rotating component.

4. The double-layer tower wheel multi-grating on-axis rotating module as claimed in claim 3, characterized in that: The first rotating assembly includes a base plate, a first column is disposed at the top center of the base plate, the first column is a vertically disposed hollow columnar structure, the bottom of the first column is connected to the base plate, and the first column passes through the tower base support from bottom to top and extends into the interior of the tower body; A first worm gear is disposed on the top of the base plate, and the first worm gear is rotatably sleeved on the outer circumference of the first column. The tower base is located above the first worm gear, and the bottom surface of the tower base is connected to the top surface of the first worm gear. A first motor and a first worm are provided on one side of the first worm wheel, the output shaft of the first motor is connected to one end of the first worm wheel, the teeth on the first worm wheel are meshed with the teeth on the first worm wheel, so that the first motor drives the first worm wheel to rotate.

5. The double-layer tower wheel multi-grating on-axis rotating module as claimed in claim 4, characterized in that: The first rotating assembly further includes a first central rotating shaft, the bottom end of which is connected to the first worm gear, and the first central rotating shaft extends from bottom to top through the bottom opening of the first column into the first column; A first angular contact ball bearing is arranged between the first central rotating shaft and the inner wall of the first column.

6. The double-layer tower wheel multi-grating on-axis rotating module as claimed in claim 4, characterized in that: The first motor is disposed on the substrate.

7. The double-layer tower wheel multi-grating on-axis rotating module as claimed in claim 5, characterized in that: The second rotating assembly includes a base disposed on the mounting table, a rotatable tray is disposed above the base, a second worm gear is disposed on the top of the tray, a top surface of the second worm gear is connected to a bottom surface of a connecting plate, and a top surface of the connecting plate is connected to the bottom of the base plate; A second motor and a second worm are provided on one side of the second worm gear, an output shaft of the second motor is connected to one end of the second worm gear, teeth on the second worm gear are meshed with teeth on the second worm gear, so that the second worm gear is driven to rotate by the second motor.

8. The double-layer tower wheel multi-grating on-axis rotating module as claimed in claim 7, characterized in that: The top center of the tray protrudes upward to form a second column, the second worm gear is sleeved on the outer circumference of the second column, and the second worm gear is connected to the tray by bolts; A connecting plate is sleeved on the outer periphery of the second column. The connecting plate is located between the top surface of the second worm gear and the bottom surface of the base plate. The second worm gear and the base plate are connected via the connecting plate.

9. The double-layer tower wheel multi-grating on-axis rotating module as claimed in claim 7, characterized in that: The second rotating assembly also includes a worm support arranged on the mounting table, the second worm is rotatably arranged on the worm support, and one end of the second worm is connected to the output shaft of the second motor through a coupling.

10. The double-layer tower wheel multi-grating on-axis rotating module as claimed in claim 7, characterized in that: The second rotating assembly further includes a second central rotating shaft, the base has a mounting hole extending vertically, the second central rotating shaft is rotatably disposed in the mounting hole, the top end of the second central rotating shaft extends out from the top opening of the mounting hole and is connected to the bottom surface of the tray; A second angular contact ball bearing is arranged between the second central rotating shaft and the inner wall of the mounting hole.

11. The double-layer tower wheel multi-grating on-axis rotating module as claimed in claim 10, characterized in that: The distance between the axis of the first central rotating shaft and the axis of the second central rotating shaft is equal to the distance between the axis of the first central rotating shaft and the vertical center line of the grating element.

12. The double-layer tower wheel multi-grating on-axis rotating module as claimed in claim 7, characterized in that: The second rotating assembly also includes a limit pin and a tension spring. The limit pin is arranged on the mounting table, one end of the tension spring is connected to the limit pin, and the other end of the tension spring is connected to the tray to limit the rotation range of the second worm gear.

13. The double-layer tower wheel multi-grating on-axis rotating module according to claim 7 or 12, characterized in that: The second rotating assembly further includes a first photoelectric sensor, which is used to collect light signals to determine the rotation angle of the second worm gear.

14. The double-layer tower wheel multi-grating on-axis rotating module as claimed in claim 4, characterized in that: A plurality of light-transmitting holes are arranged on the first worm wheel and near the edge thereof, the plurality of light-transmitting holes correspond to the plurality of grating elements one by one, and the plurality of light-transmitting holes are distributed at intervals along the circumference of the first worm wheel; The first rotating assembly also includes a second photoelectric sensor disposed on the mounting table, the second photoelectric sensor is located on one side of the first worm gear, and the second photoelectric sensor is used to collect corresponding light signals when the plurality of light-transmitting holes rotate to positions relative to the second photoelectric sensor in sequence.

15. The double-layer tower wheel multi-grating on-axis rotating module as claimed in claim 1, characterized in that: The number of the grating elements is three, and among the three grating elements, the grating element located on the same vertical line as the rotation axis of the second rotating component is opposite to the incident direction of the light.

16. A spectrometer, characterized in that: The spectrometer has a double-layer tower wheel multi-grating on-axis rotating module according to any one of claims 1 to 15.

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