Turret module and spectrometer

Abstract

According to the turret module and the spectrograph, a rotating assembly can drive a whole grating switching assembly and a grating turret assembly to rotate around a rotating axis together, and the scanning function is achieved. The grating rotating shaft is rotatably connected with the fixing frame, so that when the grating switching assembly drives the grating rotating shaft to rotate, the grating rotating shaft can drive the grating rotating tower to rotate, and then the gratings which are installed on the grating rotating tower and arranged around the grating rotating shaft rotate around the central axis of the grating rotating shaft to achieve rotation switching of the gratings. And when any grating rotates to the preset position to work, the diffraction center line of the grating at the preset position is overlapped with the rotating axis, so that the phenomenon that the diffraction surface of the grating deviates from the rotating axis in the process of rotating along with the rotating assembly can be avoided, and the use efficiency of the grating is improved.

Description

Technical Field

[0001] This application relates to the field of optical equipment technology, and in particular to a turret module and a spectrometer. Background Technology

[0002] A spectrometer is a scientific instrument used to decompose and measure the wavelength and intensity of light. It provides detailed information about the properties of a light source or substance by breaking down composite light into spectra of different wavelengths and recording the intensity of each wavelength. With the increasing demand for spectral analysis and the development of spectroscopic techniques, spectrometers covering a wide spectral range (200 nm–2500 nm) from ultraviolet (UV) to infrared (IR) are essential.

[0003] A grating is a commonly used spectroscopic element in spectrometers, decomposing composite light into single wavelengths through diffraction. A grating consists of a series of parallel, equally spaced gratings. When light strikes these gratings, interference and diffraction occur, resulting in light dispersion. Each grating has a specific optimal operating wavelength range. Therefore, traditional spectrometers using a single grating have a narrow wavelength coverage and limited applicability, making it difficult to meet diverse needs. To address this, multi-grating turrets are used to switch between different gratings for diffraction, thus expanding the spectrometer's wavelength coverage and enabling multi-band analysis to meet various requirements.

[0004] Currently, multi-grating turrets use an off-axis scanning scheme. During the scanning and rotation process, the diffraction surface of the grating deviates from the rotation axis, which reduces the efficiency of the grating. Utility Model Content

[0005] The purpose of this application is to provide a turret module and a spectrometer that do not shake during grating switching and remain stable, thereby ensuring grating positioning accuracy.

[0006] The embodiments of this application can be implemented as follows:

[0007] In a first aspect, the present invention provides a turret module, including a rotating component and a grating turret component and a grating switching component located on the rotating component, wherein the rotating component can drive the grating turret component and the grating switching component to rotate synchronously around the rotation axis.

[0008] The grating turret assembly includes a grating turret, a grating shaft, a fixing frame, multiple grating supports, and multiple gratings. The fixing frame is fixed to the rotating assembly. The grating shaft is rotatably mounted on the fixing frame, offset from the rotation axis, and perpendicular to the rotation axis. The grating turret is fitted onto the grating shaft. Multiple gratings are mounted on the grating turret and arranged around the grating shaft via the turret. Each grating has a preset position where its diffraction center line coincides with the rotation axis.

[0009] The grating switching component is connected to one end of the grating shaft and is used to drive the grating shaft to rotate, so as to realize the rotation switching of the grating.

[0010] In an optional embodiment, the grating switching assembly includes a switching motor, a transmission mechanism, and a detection element. The switching motor is fixed to the rotating assembly and / or the fixing frame. The transmission mechanism is connected to the output shaft of the switching motor and the grating rotating shaft, respectively. The detection element is used to detect the rotation angle of the grating rotating shaft or the output shaft of the switching motor.

[0011] In an optional embodiment, the transmission mechanism is a Geneva mechanism, including a driving dial and a driven Geneva wheel;

[0012] The active dial is rotatably connected to the fixed frame and is driven by the switching motor. The active dial has a locking convex arc and a locking pin.

[0013] The driven groove wheel is coaxially connected to the grating shaft, and the driven groove wheel has a plurality of radial grooves the same number as the grating and a locking concave arc between two adjacent radial grooves;

[0014] Driven by the switching motor, the locking pin can enter any of the radial slots;

[0015] When the locking pin enters the radial groove, the locking convex arc and the locking concave arc separate;

[0016] When the locking pin disengages from the radial groove, the locking convex arc and the locking concave arc engage.

[0017] In an optional embodiment, the switching motor is fixed to the rotating assembly;

[0018] The transmission mechanism also includes a gear pair, which includes a first gear and a second gear;

[0019] The first gear is coaxially connected to the output shaft of the switching motor;

[0020] The second gear is coaxially connected to the drive dial and meshes with the first gear.

[0021] In an optional embodiment, the transmission mechanism is a gear mechanism, including a meshing driving gear and a driven gear;

[0022] The switching motor is fixed to the mounting bracket;

[0023] The drive gear is coaxially connected to the output shaft of the switching motor;

[0024] The driven gear is coaxially connected to the grating shaft.

[0025] In an optional embodiment, the detection element includes a baffle and a position sensor. The baffle is coaxially connected to the grating shaft or the output shaft of the switching motor and has a plurality of marking portions the same number as the grating. The position sensor is fixed to the mounting bracket and is used to identify the marking portions.

[0026] And / or,

[0027] The two ends of the grating shaft are rotatably mounted on one of the fixed frames.

[0028] In an optional embodiment, the grating turret assembly further includes a grating bracket, through which the grating is mounted on the grating turret;

[0029] in,

[0030] The first angle between the side of the grating support near the grating turret and the grating axis is adjustable;

[0031] The grating support can drive the grating to rotate around a preset axis to change the second angle between the side of the grating support and the side of the grating turret. The preset axis is perpendicular to the side of the grating turret closest to the grating support.

[0032] In an optional embodiment, the side of the grating support near the grating turret has a stepped structure, divided into a boss area and a recess area distributed along the axial direction of the grating rotation axis;

[0033] The protruding area is connected to the grating turret;

[0034] The grating support is provided with a first adjustment hole that penetrates the recessed area;

[0035] A first adjusting member is installed in the first adjusting hole, and one end of the first adjusting member abuts against the grating turret. The axial position of the first adjusting member in the first adjusting hole is adjustable.

[0036] In an optional embodiment, the side of the grating turret closest to the grating support is provided with a mating protrusion;

[0037] The side of the grating support near the grating turret is provided with a mating groove, and the mating protrusion is received in the mating groove;

[0038] The side of the grating bracket is provided with a second adjustment hole that communicates with the mating groove;

[0039] A second adjusting member is installed in the second adjusting hole, and one end of the second adjusting member abuts against the mating protrusion. The axial position of the second adjusting member in the second adjusting hole is adjustable.

[0040] Secondly, this utility model provides a spectrometer, including the turret module described in any of the foregoing embodiments.

[0041] Compared with the prior art, the beneficial effects of the embodiments of this application include, for example:

[0042] The rotating component drives the entire grating switching component and grating turret component to rotate together around the rotation axis, achieving the scanning function. The grating shaft is rotatably connected to the fixed frame. When the grating switching component drives the grating shaft to rotate, the grating shaft drives the grating turret to rotate, causing each grating mounted on the turret and surrounding the grating shaft to rotate around the central axis of the grating shaft, thus achieving grating rotation switching. When any grating rotates to a preset position (i.e., the usage position) for operation, because the diffraction center line of the grating at the usage position coincides with the rotation axis, this avoids the phenomenon of the grating's diffraction surface deviating from the rotation axis during the rotation of the rotating component, thereby improving the grating's utilization efficiency. Attached Figure Description

[0043] To more clearly illustrate the technical solutions in the specific embodiments of this application or the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this application. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0044] Figure 1 This is a perspective view of the turret module according to the first embodiment of this application;

[0045] Figure 2 This is a front view of the turret module according to the first embodiment of this application;

[0046] Figure 3 This is a top view of the turret module according to the first embodiment of this application;

[0047] Figure 4 for Figure 2A cross-sectional view taken from the center of rotation of the grating axis;

[0048] Figure 5 for Figure 2 A cross-sectional view taken from the center of rotation of the worm gear;

[0049] Figure 6 for Figures 1 to 5 Schematic diagram of the central grating support;

[0050] Figure 7 for Figures 1 to 5 Schematic diagram of the central grating turret;

[0051] Figure 8 for Figure 6 A cross-sectional view taken from the center of the first adjustment hole;

[0052] Figure 9 for Figure 6 A cross-sectional view taken from the center of the second adjustment hole;

[0053] Figure 10 This is a perspective view of the turret module in the second embodiment;

[0054] Figure 11 This is a side view of the turret module in the second embodiment;

[0055] Figure 12 for Figure 11 A cross-sectional view taken from the center of rotation of the worm gear;

[0056] Figure 13 This is a partial top view of the turret module in the second embodiment.

[0057] Icons: 110 - Base plate; 111 - Clearance hole; 120 - Scanning motor; 121 - Scanning motor bracket; 122 - Coupling; 123 - Photoelectric encoder; 130 - Worm gear bracket; 131 - Skirt; 140 - Worm gear shaft; 141 - Flange; 142 - Worm gear shaft end cover; 150 - Worm gear; 151 - Positioning hole; 160 - Worm; 161 - Worm gear bracket; 211 - Grating 212-Ribbon fixing bracket; 220-Ribbon shaft; 221-Mounting ring; 222-Ribbon shaft end cap; 230-Ribbon turret; 231-Mounting plate; 232-Ribbon turret cover; 233-First threaded hole; 234-Matching protrusion; 235-Second threaded hole; 240-Ribbon bracket; 241-Boss area; 242-Recessed area; 243-First adjustment hole; 244- 245 - First through hole; 246 - Fitting groove; 247 - Second adjustment hole; 250 - Second through hole; 310 - Grating; 311 - Switching motor; 312 - Switching motor bracket; 312 - Waist-shaped hole; 320 - Driving gear; 330 - Driven gear; 340 - Baffle; 350 - Position sensor; 351 - Sensor bracket; 360 - Driving dial; 361 - Locking pin; 362 - Locking convex arc; 363 - Dial shaft; 364 - Dial shaft end cap; 365 - Connecting post; 370 - Driven grooved wheel; 371 - Radial groove; 372 - Locking concave arc; 380 - First gear; 390 - Second gear; 400 - First adjusting component; 500 - Second adjusting component; 600 - First fixing screw; 700 - Second fixing screw; A - Rotation axis; B - Diffraction center line; C - Vertical axis. Detailed Implementation

[0058] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. The components of the embodiments of this application described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0059] Therefore, the following detailed description of the embodiments of this application provided in the accompanying drawings is not intended to limit the scope of the claimed application, but merely to illustrate selected embodiments of the application. All other embodiments obtained by those skilled in the art based on the embodiments of this application without inventive effort are within the scope of protection of this application.

[0060] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0061] In the description of this application, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product of this application is in use. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on this application. In addition, the terms "first," "second," and "third," etc., are only used to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0062] Furthermore, terms such as "horizontal," "vertical," and "sag" do not imply that components must be absolutely horizontal or suspended, but rather that they can be slightly tilted. For example, "horizontal" simply means that its direction is more horizontal relative to "vertical," and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0063] In the description of this application, it should also be noted that, unless otherwise expressly specified and limited, the terms "set up," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0064] The following detailed description of some embodiments of this application is provided in conjunction with the accompanying drawings. Unless otherwise specified, the following embodiments and features can be combined with each other.

[0065] First Embodiment

[0066] refer to Figures 1 to 3 This application discloses a turret module, which includes a rotating component and a grating turret component and a grating switching component located on the rotating component. The rotating component can drive the grating turret component and the grating switching component to rotate synchronously around the rotation axis A.

[0067] The grating turret assembly includes a grating turret 230, a grating shaft 220, a mounting frame, multiple grating supports 240, and multiple gratings 250.

[0068] Combination Figure 4The grating shaft 220 is offset from the rotation axis A and perpendicular to the rotation axis A. The grating shaft 220 is rotatably mounted on the fixed frame. For example, bearings are fitted at both ends of the grating shaft 220. The bearings can be angular contact ball bearings, which have both radial and axial support effects. The outer ring of the angular contact ball bearing is fixed on the fixed frame, so that the grating shaft 220 can rotate relative to the fixed frame.

[0069] The grating turret 230 is coaxially mounted on the grating shaft 220 and fixed to the grating shaft 220 with screws.

[0070] Specifically, a mounting ring 221 is provided on the outer peripheral wall of the grating shaft 220, the grating turret 230 has a hollow structure with one side open, and a mounting plate 231 is formed inside the grating turret 230. The grating shaft 220 passes through the mounting plate 231. Screws can be locked into the mounting ring 221 and the mounting plate 231 from the open side of the grating turret 230, thereby realizing the fixed connection between the grating turret 230 and the grating shaft 220.

[0071] The two mounting brackets are a grating shaft mounting bracket 211 and a turret mounting bracket 212, both fixed to the rotating assembly, providing support for the grating shaft 220. The grating shaft 220 is connected to a turret shaft end cap 222 by screws. The turret shaft end cap 222 is located on the side of the grating shaft mounting bracket 211 opposite to the grating turret 230. The turret shaft end cap 222 abuts against the inner ring of the angular contact ball bearing, serving as an axial limit for the grating shaft 220.

[0072] A grating turret cover 232 is provided on one side of the grating turret 230 to cover the side opening of the grating turret 230, thereby protecting the environment and enhancing the structural rigidity.

[0073] Each grating 250 is mounted on a grating turret 230 via a grating support 240. All gratings 250 are mounted on the grating turret 230, and the gratings 250 are arranged around the grating rotation axis 220 via the grating turret 230. Each grating 250 has a preset position where its diffraction center line B coincides with the rotation axis A. The preset position is also the operating position of the grating 250. When parallel light shines perpendicularly onto the grating 250, due to the periodic structure of the grating 250, a combination of multi-slit interference and single-slit diffraction occurs, forming a series of bright fringes. These bright fringes correspond to different orders of diffracted light. The position of the brightest central fringe is the diffraction center line of the grating 250. Therefore, the diffraction center line usually refers to the position of the zero-order diffraction maximum, also known as the central bright fringe or zero-order spectral line. The distance between the side of each grating 250 away from the grating axis 220 and the grating axis 220 is equal to the vertical distance between the rotation axis (A) and the grating axis 220.

[0074] The grating switching component is connected to one end of the grating rotating shaft 220 and is used to drive the grating rotating shaft 220 to rotate the grating turret 230, thereby realizing the rotation switching of the grating 250.

[0075] As described above, the rotating component can drive the entire grating switching component and the grating turret component to rotate together around the rotation axis A to achieve the scanning function. Both ends of the grating shaft 220 are rotatably connected to a fixed frame, ensuring that both ends of the grating shaft 220 are supported. This prevents the grating turret 230, coaxially mounted on the grating shaft 220, from having a cantilever structure with only one side supported. This prevents wobbling when the grating switching component drives the grating shaft 220 to rotate, maintaining stability and ensuring the positioning accuracy of the grating 250.

[0076] When the grating shaft 220 rotates, it drives the grating turret 230 to rotate as well, causing the various gratings 250 mounted on the turret 230 and surrounding the shaft 220 to rotate. This allows for the switching of the gratings 250. When any grating is in its working position, the diffraction center line B of the grating 250 in the working position coincides with the rotation axis A. This prevents the diffraction surface of the grating 250 from deviating from the rotation axis A during the rotation of the rotating assembly, thereby improving the efficiency of the grating 250. Figure 1 As shown, the grating facing the worm 160 is in the working position, and its own diffraction center line B coincides with the rotation axis A.

[0077] Of course, it is understandable that in some embodiments where the accuracy requirements of the grating 250 are not high, the grating shaft 220 can be rotatably connected to a fixed frame at only one end. That is, as long as the grating shaft 220 is rotatably mounted on the fixed frame, and the fixed frame is fixed on the rotating component, the rotating component can rotate around the rotation axis A together with the grating turret component and the grating switching component.

[0078] Combination Figure 1 and Figure 5 The rotating assembly includes a base plate 110, a scanning motor 120, a worm gear bracket 130, a worm gear shaft 140, a worm gear mechanism, and an encoder; the base plate 110 mainly serves as a load-bearing support.

[0079] The worm gear bracket 130 is fixed to the base plate 110. For example, a clearance hole 111 is provided in the central area of ​​the base plate 110. A portion of the worm gear bracket 130 is embedded in the clearance hole 111, and the portion of the worm gear bracket 130 outside the clearance hole 111 forms a skirt 131 and is connected to the base plate 110 by screws.

[0080] The worm gear shaft 140 is rotatably mounted on the worm gear bracket 130. The worm gear shaft 140 is perpendicular to the base plate 110 and perpendicular to the rotation axis A. Two bearings are mounted on the worm gear shaft 140, and the outer rings of the bearings are fixed to the worm gear bracket 130, so that the worm gear shaft 140 can rotate relative to the worm gear bracket 130.

[0081] The worm gear mechanism includes a worm wheel 150 and a worm 160. The worm wheel 150 is coaxially connected to the worm wheel shaft 140, so the worm wheel 150 is coaxial with the rotation axis A.

[0082] For example, a positioning hole 151 coaxial with itself is provided at the center of the worm gear 150, and the worm gear shaft 140 is inserted into the positioning hole 151. At the same time, an integral flange 141 is formed on the outer side of the worm gear shaft 140. The flange 141 fits against the end face of the worm gear 150, and the flange 141 and the worm gear 150 are connected by screws, thereby realizing the coaxial connection between the worm gear 150 and the worm gear shaft 140.

[0083] The grating turret assembly and the grating switching assembly are both located on the worm gear 150 so that they rotate around the rotation axis A as the worm gear 150 rotates.

[0084] The end of the worm gear shaft 140 away from the worm gear 150 is fixed with a worm gear shaft end cap 142, which provides axial positioning of the worm gear shaft 140.

[0085] The two ends of the worm 160 are rotatably mounted on the worm support 161 via bearings. The worm support 161 is fixed to the base plate 110. The rotation axis of the worm 160 is perpendicular to the rotation axis A, and the worm 160 meshes with the outer teeth of the worm wheel 150. The scanning motor 120 is fixed to the base plate 110 via the scanning motor support 121. The output shaft of the scanning motor 120 is coaxially connected to the worm 160 via the coupling 122. Thus, when the scanning motor 120 is running, it drives the worm 160 to rotate. Then, through the meshing transmission of the worm wheel 150 and the worm 160, the direction of torque is changed, causing the worm wheel 150 to rotate.

[0086] To achieve a high transmission ratio, a single-start worm gear 160 is selected. This maximizes the achievement of the finest single-step accuracy requirements and ensures smooth and reliable meshing transmission.

[0087] The encoder can be a photoelectric encoder 123, which is fixed on the scanning motor bracket 121. It is mainly used to detect and provide real-time feedback on the rotational speed and angle of the output shaft of the scanning motor 120, so as to realize the closed-loop control of the scanning motor 120, thereby achieving the high-precision repeatability and high-resolution scanning accuracy required by the spectrometer.

[0088] Continue to refer to Figures 1 to 3Both the grating axis mounting bracket 211 and the pulley mounting bracket 212 are fixed to the upper end face of the worm gear 150 with screws. The pulley mounting bracket 212 is used to fix the grating switching assembly. Therefore, the thickness, height and width of the pulley mounting bracket 212 must be greater than the thickness, height and width of the grating axis 250 to ensure load-bearing strength and stability.

[0089] The grating switching assembly includes a switching motor 310, a transmission mechanism, and a detection element.

[0090] The switching motor 310 is fixed to the mounting bracket. Specifically, the switching motor 310 is fixed to the tower wheel mounting bracket 212.

[0091] The transmission mechanism is connected to the output shaft of the switching motor 310 and the grating shaft 220 respectively, so as to amplify the torque output by the switching motor 310 and transmit it to the grating shaft 220, thereby realizing the rotation of the grating shaft 220 relative to the fixed frame.

[0092] The detection element is used to detect the rotation angle of the output shaft of the switching motor 310. Since the transmission ratio of the transmission mechanism is fixed, the rotation angle of the grating shaft 220 can be determined by the real-time rotation angle of the output shaft. Then, the operation time of the switching motor 310 can be controlled to switch the required grating 250 to the usage position. Therefore, the detection element plays the role of identifying and locating the currently used grating 250.

[0093] Specifically, the transmission mechanism is a gear mechanism, including a meshing drive gear 320 and a driven gear 330; the drive gear 320 is coaxially connected to the output shaft of the switching motor 310; the driven gear 330 is coaxially connected to the grating shaft 220, so that the torque output by the switching motor 310 is transmitted to the grating shaft 220 through gear transmission.

[0094] The diameter and number of teeth of the driving gear 320 are smaller than those of the driven gear 330. This reduces the rotational speed and amplifies the torque, thereby reducing the load on the switching motor 310.

[0095] The detection component includes a baffle 340 and a position sensor 350. The baffle 340 is coaxially connected to the output shaft of the switching motor 310 and has multiple marking sections the same number as the grating 250. The central angle between two adjacent marking sections is the same as the central angle between two adjacent gratings 250.

[0096] The position sensor 350 is fixed to the tower wheel mounting bracket 212 via the sensor bracket 351 and is located below the baffle 340. The position sensor 350 is used to identify the marking parts. When the grating shaft 220 rotates, the baffle 340 rotates accordingly, and each marking part also rotates. The position sensor 350 detects the signal change generated by the marking part, thereby realizing the detection of the rotation angle and speed of the switching motor 310, so as to control the different gratings 250 to switch to the use position for use.

[0097] The switching motor 310 can be a stepper motor with encoder feedback. The initial position signal recorded and fed back by the position sensor 350 is compared with the encoder closed-loop system built into the switching motor 310 itself to identify the corresponding grating 250 and control the rotation angle of the switching motor 310, so as to realize the switching use of multiple gratings 250.

[0098] The position sensor 350 can be a photoelectric sensor, and the recognition part can be a hollow structure opened on the baffle 340. Of course, the recognition part can also be a strip-shaped object provided on the outer peripheral surface of the baffle 340.

[0099] Of course, in some embodiments, the switching motor 310 can be fixed to the worm gear 150 by the switching motor bracket 311. It is also feasible to simply add another gear to the gear mechanism or increase the diameter of the driving gear 320 and the driven gear 330. The photoelectric sensor can also be replaced with other types of sensors capable of position detection, such as Hall sensors.

[0100] Since the grating 250 is connected to the worm gear 150 in sequence through the grating support 240, the grating turret 230 and the fixing frame, the assembly errors between multiple parts or the degradation of fit caused by long-term use will gradually accumulate. Therefore, it will affect the pitch angle and tilt angle of the grating 250 when it is in use. The pitch angle affects the vertical alignment of the grating 250 when it is in use, and the tilt angle affects the horizontal alignment of the grating 250 when it is in use. If there is a deviation in the pitch angle and tilt angle, it will affect the spectral resolution, spectral intensity distribution and optical path calibration, thus affecting the performance of the spectrometer. Therefore, it is necessary to adjust the pitch angle and tilt angle.

[0101] Pitch angle adjustment refers to the angle at which the grating 250 rotates around a vertical axis when in use, with the direction of rotation approximately as follows: Figure 3 As shown in the U direction, the vertical axis is parallel to the rotation axis A, that is, the angle between the diffraction surface of the grating 250 and the central axis of the grating rotation axis 220 is adjusted. Depending on the assembly accuracy of the parts, when the pitch angle is accurate, this angle can be zero or non-zero.

[0102] Tilt angle adjustment refers to the angle at which the grating 250, in its operating position, rotates about a vertical axis C. The direction of rotation is approximately as follows: Figure 2 As shown in the V direction, the vertical axis C is perpendicular to the side of the grating turret 230 near the grating support 240. That is, adjusting the angle between the diffraction center line of the grating 250 and the central axis of the grating rotation axis 220, depending on the assembly accuracy of the parts, this angle can be zero or non-zero when the tilt angle is accurate.

[0103] Since the grating 250 is mounted on the grating turret 230 via the grating bracket 240, and the grating 250 remains fixed relative to the grating bracket 240, it is necessary to adjust the attitude of the grating bracket 240 relative to the grating turret 230 in order to achieve the pitch angle and tilt angle adjustment of the grating 250.

[0104] Specifically, the first angle between the side of the grating support 240 near the grating turret 230 and the grating rotation axis 220 is adjustable, thereby indirectly adjusting the pitch angle of the grating 250 by adjusting the first angle; the grating support 240 can drive the grating 250 to rotate around the vertical axis C, thereby changing the second angle between the side of the grating support 240 and the side of the grating turret 230, thereby indirectly adjusting the tilt angle of the grating 250 by adjusting the second angle, so as to ensure that the grating 250 can correctly reflect and diffract light, thereby ensuring the performance of the spectrometer.

[0105] Combination Figures 6 to 8 In this embodiment, the side of the grating support 240 near the grating turret 230 has a stepped structure, which is divided into a boss area 241 and a recessed area 242 distributed along the axial direction of the grating rotation axis 220. Thus, the grating support 240 has an overall L-shaped structure.

[0106] The boss area 241 is connected to the grating turret 230. For example, the grating bracket 240 is provided with one or more fastening holes that penetrate the boss area 241. Fastening screws pass through the fastening holes and are locked into the fastening threaded holes on the grating bracket 240 to achieve the connection between the boss area 241 and the grating turret 230.

[0107] The grating support 240 is provided with a first adjustment hole 243 penetrating the recessed area 242; a first adjustment member 400 is installed in the first adjustment hole 243, one end of the first adjustment member 400 abuts against the grating turret 230. The axial position of the first adjustment member 400 in the first adjustment hole 243 is adjustable. With the end of the first adjustment member 400 abutting against the grating turret 230, the distance between the first adjustment hole 243 and the grating turret 230 will also change due to the change in the axial position of the first adjustment member 400 in the first adjustment hole 243. The boss area 241 is also kept in contact with the grating turret 230. Therefore, the entire grating support 240 will rotate relative to the grating turret 230, thereby realizing the adjustment of the first angle, that is, realizing the micro-adjustment of the pitch angle of the grating 250.

[0108] The first adjustment hole 243 can be a threaded hole, and the first adjustment component 400 can be a screw. The pitch angle is adjusted by the thread engagement depth. The structure is simple and easy to operate.

[0109] Of course, to ensure the reliability of the connection between the grating bracket 240 and the grating turret 230, and to maintain the grating angle unchanged after adjusting the pitch angle of the grating 250, the grating bracket 240 is also provided with a first through hole 244. A first fixing screw 600 passes through the first through hole 244 and is locked into the first threaded hole 233 provided on the grating turret 230. Thus, when the pitch angle needs to be adjusted, first loosen the first fixing screw 600, and then turn the first adjusting component 400 clockwise or counterclockwise. During the process of turning the first adjusting component 400, the first angle and the pitch angle change accordingly. After the adjustment is completed, tighten the first fixing screw 600.

[0110] The central axis of the first adjustment hole 243 is perpendicular to and intersects the central axis of the grating shaft 220. Thus, the first adjustment hole 243 and the first adjustment component 400 are located in the center of the width direction of the grating support 240, so as to ensure that the grating 250 changes its angle relative to the grating turret 230 as a whole, thereby ensuring the accuracy of the pitch angle adjustment.

[0111] Of course, in some embodiments, the first fastener may also be a pin or the like.

[0112] Combination Figure 6 , Figure 7 and Figure 9 In this embodiment, the grating turret 230 is provided with a mating protrusion 234 on the side near the grating support 240;

[0113] The side of the grating support 240 near the grating turret 230 is provided with a mating groove 245, and the mating protrusion 234 is received in the mating groove 245;

[0114] The grating support 240 has a second adjustment hole 246 on one side of the grating shaft 220 along the axial direction. The second adjustment hole 246 is parallel to the grating shaft 220 and deviates from the center line of the length direction of the grating support 240. That is, the second adjustment hole 246 is located off-center on the short side of the grating support 240.

[0115] A second adjusting member 500 is installed in the second adjusting hole 246. One end of the second adjusting member 500 abuts against the mating protrusion 234. The axial position of the second adjusting member 500 in the second adjusting hole 246 is adjustable.

[0116] With the end of the second adjusting member 500 abutting against the mating protrusion 234, the axial position of the second adjusting member 500 changes within the second adjusting hole 246. As a result, the angle between the length direction of the mating protrusion 234 and the length direction of the mating groove 245 will change, and the angle between the side of the grating support 240 and the side of the grating turret 230 will also change, thereby realizing the adjustment of the second angle, that is, realizing the micro-adjustment of the tilt angle of the grating 250.

[0117] The second adjustment hole 246 can be a threaded hole, and the second adjustment component 500 can be a screw. The tilt angle is adjusted by the thread engagement depth. The structure is simple and easy to operate.

[0118] Of course, to ensure the reliability of the connection between the grating bracket 240 and the grating turret 230, and to maintain the tilt angle after adjusting the tilt angle of the grating 250, a second through hole 247 is also provided on the side of the grating bracket 240. The second through hole 247 connects to the mating groove 245, and a second fixing screw 700 passes through the first through hole and locks into the second threaded hole 235 provided on the mating boss. Thus, when the tilt angle needs to be adjusted, first loosen the second fixing screw 700, and then turn the second adjusting component 500 clockwise or counterclockwise. During the process of turning the second adjusting component 500, the second angle and the tilt angle change accordingly. After the adjustment is completed, tighten the first fixing screw 600.

[0119] Furthermore, this application also discloses a spectrometer having the aforementioned turret module, and thus also possessing the corresponding structure and beneficial effects.

[0120] Second Embodiment

[0121] Unlike the first embodiment, as Figures 10 to 13 As shown, in this embodiment, the switching motor 310 is fixed to the rotating assembly, and the detection element is used to detect the rotation angle of the grating shaft 220. The transmission mechanism is a Geneva mechanism.

[0122] Specifically, the Maltese cross mechanism is an intermittent motion mechanism, mainly used to convert the continuous rotational motion of the output shaft of the switching motor 310 into the intermittent rotational motion of the grating shaft 220.

[0123] refer to Figure 10 and Figure 11 The Geneva mechanism includes a driving dial 360 and a driven Geneva 370;

[0124] The active dial 360 is rotatably connected to the tower wheel fixing frame 212 and is connected to the switching motor 310 for transmission. The active dial 360 has a locking convex arc 362 and a locking pin 361, so that the switching motor 310 can drive the active dial 360 to rotate.

[0125] The driven groove wheel 370 is coaxially connected to the grating shaft 220. The driven groove wheel 370 has a plurality of radial grooves 371, the same number as the grating 250, and a locking concave arc 372 between two adjacent radial grooves 371.

[0126] Driven by the switching motor 310, the locking pin 361 can enter any of the radial slots 371;

[0127] When the locking pin 361 is fully inserted into the radial groove 371, the locking convex arc 362 and the locking concave arc 372 separate. When the locking pin 361 is disengaged from the radial groove 371, the locking convex arc 362 and the locking concave arc 372 come into contact.

[0128] In this way, when the active dial 360 is driven by the switching motor 310 to rotate at a constant speed, its locking pin 361 enters a radial groove 371 of the grooved wheel and pushes the grooved wheel to rotate a certain angle (depending on the number and design of the radial grooves 371, the angle of each rotation is determined by the number of radial grooves 371 on the driven grooved wheel 370, that is, if the number of grating 250 and radial grooves 371 are both n, then the angle of each rotation is 360° / n. For example, with four radial grooves 371 as shown in the figure, then each rotation is 90°). Once the locking pin 361 disengages from the radial groove 371, the locking convex arc 362 and the locking concave arc 372 immediately engage, and the driven grooved wheel 370 stops rotating until the next locking pin 361 enters the next groove, thus realizing the intermittent rotation of the grooved wheel. Since the rotation angle is a fixed 90 degrees each time, the control precision requirement for the switching motor 310 is greatly reduced. Compared with the first embodiment, this embodiment no longer needs to detect the rotation angle of the switching motor 310 in real time through closed-loop feedback. The precision requirements of the switching grating 250 in terms of motor and control are reduced, and the cost is also reduced. The locking pin 361 can be set to a cylindrical shape, so it can also be called a cylindrical pin.

[0129] The switching motor 310 is fixed to the worm gear 150 via the switching motor bracket 311, thus eliminating the need to increase the size of the tower wheel fixing bracket 212 and utilizing the space on the worm gear to improve structural compactness. To transmit the torque of the switching motor 310 to the drive dial 360, the transmission mechanism also includes a gear pair, comprising a first gear 380 and a second gear 390. The first gear 380 is coaxially connected to the output shaft of the switching motor 310; the second gear 390 is coaxially connected to the drive dial 360 and meshes with the first gear 380. Thus, when the switching motor 310 is running, the first gear 380 drives the second gear 390 to rotate. Since the second gear 390 is coaxially connected to the drive dial 360, it can drive the drive dial 360 to rotate.

[0130] The diameter of the first gear 380 is smaller than that of the second gear 390, so that the gear pair can also amplify the torque.

[0131] Combination Figures 11 to 12 The active dial 360 is mounted on the dial shaft 363 via a bearing. The dial shaft 363 can be fixed to the tower wheel mounting bracket 212 with screws. Because the dial shaft 363 is fixed to the tower wheel mounting bracket 212, it cannot rotate. The active dial 360 mounted on the dial shaft 363 rotates relative to the tower wheel mounting bracket 212 by the inner ring of the bearing not rotating and the outer ring rotating.

[0132] One end of the dial shaft 363 away from the turret 212 can be connected to a dial shaft end cap 364 by screws. The dial shaft end cap 364 is located on the side of the active dial 360 away from the grating turret 230, and the dial shaft end cap 364 plays the role of limiting the axial movement of the active dial 360.

[0133] The second gear 390 is located on the side of the active dial 360 facing the tower wheel mounting bracket 212. The second gear 390 is coaxially connected to the active dial 360 through a hole-shaft engagement and screw locking. Specifically, the active dial 360 has a protruding connecting post 365 on the side facing the tower wheel mounting bracket 212. The second gear 390 is fitted onto the connecting post 365, and then the second gear 390 and the active dial 360 can be axially connected and locked by bolts.

[0134] In addition, in some embodiments, the second gear 390 may also be integrally formed with the active dial 360.

[0135] In this embodiment, the switching motor bracket 311 is provided with a waist-shaped hole 312. The length direction of the waist-shaped hole 312 is along the radial direction of the worm gear 150. The worm gear 150 is locked in by screws passing through different positions of the U-shaped groove, thereby changing the position of the switching motor 310 on the worm gear 150, thereby adjusting the center distance between the first gear 380 and the second gear 390, and ensuring the meshing of the first gear 380 and the second gear 390.

[0136] In this embodiment, the detection element is used to detect the rotation angle of the grating shaft 220 in order to identify and locate the currently used grating 250. Wherein, reference... Figure 13 The baffle 340 is coaxially connected to the grating shaft 220, and the position sensor 350 is mounted on the tower wheel mounting bracket 212.

[0137] In summary, the turret module and spectrometer of this application have at least the following advantages compared to the prior art:

[0138] 1. By avoiding cantilever structures, the stability of the grating 250 during switching is improved, ensuring the positioning accuracy of the grating 250 and thus guaranteeing the performance of the spectrometer.

[0139] 2. It achieves the alignment of the diffraction center line B with the rotation axis A during the use of grating 250, effectively improving the utilization efficiency of grating 250 and enhancing the instrument performance of the spectrometer.

[0140] 3. Through the high transmission ratio of the worm gear 150 and worm 160, and the closed-loop feedback motor system with photoelectric encoder 123, the grating turret 230 achieves high precision and high resolution during the scanning process, and achieves smooth and reliable meshing transmission to achieve high repeatability.

[0141] 4. The intermittent motion of the Geneva structure and the fact that each switch is a fixed 90 degrees greatly reduce the control accuracy requirements of the switching motor 310. There is no need to detect the rotation angle of the motor through closed-loop feedback. The switching grating 250 solution reduces the accuracy of the motor and control, and also reduces the cost investment in this area.

[0142] 5. Through the transmission of the worm gear mechanism with a high transmission ratio and the closed-loop feedback motor system with photoelectric encoder 123, the grating turret 230 achieves high precision and high resolution during the scanning process, and realizes smooth and reliable meshing transmission to achieve high repeatability.

[0143] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application.

Claims

1. A turret module, characterized in that, It includes a rotating component and a grating turret assembly and a grating switching assembly disposed on the rotating component. The rotating component can drive the grating turret assembly and the grating switching assembly to rotate around a rotation axis (A). The grating turret assembly includes a grating turret (230), a grating shaft (220), a fixing frame, and multiple gratings (250). The fixing frame is fixed to the rotating assembly. The grating shaft (220) is rotatably mounted on the fixing frame, offset from the rotation axis (A), and perpendicular to the rotation axis (A). The grating turret (230) is fitted onto the grating shaft (220). Multiple gratings (250) are mounted on the grating turret (230) and arranged around the grating shaft (220) via the grating turret (230). Each grating (250) has a preset position where its diffraction center line coincides with the rotation axis (A). The grating switching component is connected to the grating shaft (220) and is used to drive the grating shaft (220) to rotate so as to realize the rotation switching of the grating (250).

2. The turret module according to claim 1, characterized in that, The grating switching assembly includes a switching motor (310), a transmission mechanism, and a detection element. The switching motor (310) is fixed to the rotating assembly and / or the fixed frame. The transmission mechanism is connected to the output shaft of the switching motor (310) and the grating rotating shaft (220) respectively. The detection element is used to detect the rotation angle of the grating rotating shaft (220) or the output shaft of the switching motor (310).

3. The turret module according to claim 2, characterized in that, The transmission mechanism is a Geneva mechanism, including a driving dial (360) and a driven Geneva wheel (370); The active dial (360) is rotatably connected to the fixed frame and is drivenly connected to the switching motor (310). The active dial (360) has a locking convex arc (362) and a locking pin (361). The driven groove wheel (370) is coaxially connected to the grating shaft (220). The driven groove wheel (370) has a plurality of radial grooves (371) in the same number as the grating (250) and a locking concave arc (372) between two adjacent radial grooves (371). Driven by the switching motor (310), the locking pin (361) can enter any of the radial slots (371); When the locking pin (361) enters the radial groove (371), the locking convex arc (362) and the locking concave arc (372) separate; When the locking pin (361) disengages from the radial groove (371), the locking convex arc (362) and the locking concave arc (372) engage.

4. The turret module according to claim 3, characterized in that, The switching motor (310) is fixed to the rotating assembly; The transmission mechanism also includes a gear pair, which includes a first gear (380) and a second gear (390); The first gear (380) is coaxially connected to the output shaft of the switching motor (310); The second gear (390) is coaxially connected to the drive dial (360) and meshes with the first gear (380).

5. The turret module according to claim 2, characterized in that, The transmission mechanism is a gear mechanism, including a meshing driving gear (320) and a driven gear (330); The switching motor (310) is fixed to the mounting bracket; The drive gear (320) is coaxially connected to the output shaft of the switching motor (310); The driven gear (330) is coaxially connected to the grating shaft (220).

6. The turret module according to claim 2, characterized in that, The detection component includes a baffle (340) and a position sensor (350). The baffle (340) is coaxially connected to the output shaft of the grating shaft (220) or the switching motor (310), and has a plurality of marking portions the same number as the grating (250). The position sensor (350) is fixed to the mounting bracket and is used to identify the marking portions. And / or, The two ends of the grating shaft (220) are rotatably mounted on the fixed frame.

7. The turret module according to claim 1, characterized in that, The grating turret assembly further includes a grating bracket (240), and the grating (250) is mounted on the grating turret (230) via the grating bracket (240); in, The first angle between the side of the grating support (240) near the grating turret (230) and the grating axis (220) is adjustable; The grating support (240) can drive the grating (250) to rotate around a vertical axis (C) to change the second angle between the side of the grating support (240) and the side of the grating turret (230), wherein the vertical axis (C) is perpendicular to the side of the grating turret (230) close to the grating support (240).

8. The turret module according to claim 7, characterized in that, The side of the grating support (240) near the grating turret (230) has a stepped structure, which is divided into a boss area (241) and a recessed area (242) distributed along the axial direction of the grating axis (220). The protruding area (241) is connected to the grating turret (230); The grating support (240) is provided with a first adjustment hole (243) penetrating the recessed area (242); A first adjusting member (400) is installed in the first adjusting hole (243), one end of the first adjusting member (400) abuts against the grating turret (230), wherein the axial position of the first adjusting member (400) in the first adjusting hole (243) is adjustable.

9. The turret module according to claim 7, characterized in that, The grating turret (230) has a mating protrusion (234) on the side near the grating support (240); The grating support (240) has a mating groove (245) on the side near the grating turret (230), and the mating protrusion (234) is received in the mating groove (245); The side of the grating bracket (240) is provided with a second adjustment hole (246) that communicates with the mating groove (245); A second adjusting member (500) is installed in the second adjusting hole (246), one end of the second adjusting member (500) abuts against the mating protrusion (234), wherein the axial position of the second adjusting member (500) in the second adjusting hole (246) is adjustable.

10. A spectrometer, characterized in that, Includes the turret module as described in any one of claims 1-9.

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