A universal near-infrared spectrum detection device

Abstract

The present invention discloses a universal near-infrared spectrum detection device, comprising a control box and a dark box, wherein the control box is placed in front of the dark box and the two are fixedly connected, wherein: the control box comprises a spectrometer installed in the control box; the dark box comprises a sample supporting device, a near-infrared light source and a light receiver; the near-infrared light source is used to irradiate the sample supporting device with light, and the light signal receiver is used to receive a light signal after passing through the sample supporting device, and send the received light signal to the spectrometer.

Description

Technical Field

[0001] The invention relates to the field of near-infrared spectroscopy instruments, and in particular to a universal near-infrared spectroscopy detection device. Background Art

[0002] Near-infrared spectroscopy can reflect the doublet and sum frequency absorption of the vibration of hydrogen-containing groups of the detection object, and has rich structural and composition information. The chemometric algorithm can be used to establish a mathematical relationship between the spectral data and the components to be measured, thereby achieving qualitative or quantitative analysis of the components to be measured.

[0003] For spectral detection of solid particles or powders, the sample surface needs to be flattened and multi-point acquisition and averaging are required. Currently, most of the operations are done manually, which results in great human errors and increases the uncontrollability of spectral data. At present, the internal structure of the spectral detection device is rigid, and the structural parameters cannot be adjusted according to the detection object to obtain the best spectral data. Therefore, it cannot be used for detection objects of various forms. In order to meet the laboratory's detection needs for a variety of samples, a simple spectral acquisition platform is often used in conjunction with a spectrometer, which is prone to spectral uncertainty mainly caused by systematic errors.

[0004] To this end, the present invention provides a universal near-infrared spectrum detection device, which can well solve the above problems. Summary of the invention

[0005] In order to achieve the purpose of the present invention, the following technical solutions are adopted:

[0006] A universal near-infrared spectrum detection device comprises a control box and a dark box, wherein the control box is placed in front of the dark box, and the two box spaces are independent of each other but fixedly connected by screws, wherein: the control box comprises a spectrometer installed in the control box; the dark box comprises a sample supporting device, a near-infrared light source and a light receiver; the near-infrared light source is used to irradiate the sample supporting device, and the light signal receiver is used to receive light signals after passing through the sample supporting device, and send the received light signals to the spectrometer.

[0007] The universal near-infrared spectrum detection device, wherein: the control box includes a power supply, a motor control board, a host computer, and a fan installed in the control box; and a display screen, an emergency stop button, a motor speed control knob, a light source switch, a motor forward and reverse switch, a power interface and a USB interface installed on the control box casing.

[0008] The universal near-infrared spectrum detection device, wherein: the sample carrying device includes a lower support plate of a planar thrust bearing, a ball core, an upper support plate of a planar thrust bearing, a driven rubber-coated wheel and an active rubber-coated wheel.

[0009] The universal near-infrared spectrum detection device, wherein: a ball core is carried on the lower support plate of the planar thrust bearing, an upper support plate of the planar thrust bearing and a driven rubber-coated wheel are installed on the ball core, the driven rubber-coated wheel is wrapped on the upper support plate of the planar thrust bearing, a groove is opened on the upper part of the upper support plate of the planar thrust bearing, and the active rubber-coated wheel is driven by a motor and contacts with the driven rubber-coated wheel.

[0010] The universal near-infrared spectrum detection device, wherein: a positioning groove is provided on the edge of the groove of the support plate on the plane thrust bearing, which is used to cooperate with the positioning pin on the edge of the sample box.

[0011] The universal near-infrared spectrum detection device, wherein: a top plate is installed in the dark box body, and the lower support plate of the plane thrust bearing is installed on the installation hole opened on the top plate.

[0012] The universal near-infrared spectrum detection device, wherein: two left and right ventilation plates are arranged inside the dark box body, the two ventilation plates are perpendicular to the bottom plate, and the two ventilation plates are arranged parallel to each other.

[0013] The universal near-infrared spectrum detection device, wherein: a DC motor is fixed on the lower surface of the top plate, the motor rotary shaft extends out through a hole opened on the top plate, and an active rubber-coated wheel is installed on the head of the rotary shaft.

[0014] The universal near-infrared spectrum detection device, wherein: it also includes a partition plate, each ventilation plate is equipped with two guide rails, each guide rail is equipped with a lockable slider, and each slider is fixedly connected to the lower part of the partition plate.

[0015] The universal near-infrared spectrum detection device, wherein: the optical fiber adjustment bracket is installed on the partition plate, one end of the optical fiber is connected to the spectrometer, and the other end passes through the reserved hole on the partition plate and is fixed by the optical fiber adjustment bracket.

[0016] The universal near-infrared spectrum detection device, wherein: the partition plate is also equipped with a focusing wheel.

[0017] The universal near-infrared spectrum detection device, wherein: a guide groove is provided on the partition plate 24, the guide groove is concave, and the guide groove has a circular hole of the same size as the maximum outer diameter of the near-infrared light source.

[0018] The universal near-infrared spectrum detection device, wherein: the condenser rotating wheel includes a rotating circle, a fixed circle, a condenser, a locking block and a spring; four circular stepped holes are opened on the rotating circle, the lower step of the circular hole is equal to the maximum outer diameter of the near-infrared light source, the upper step of the circular hole is slightly larger than the lower step of the circular hole, and condensers with different focal lengths are placed on the upper step of the circular hole; the condenser is fixed to the rotating circle through the fixed circle, a circle of bosses is set under the rotating circle, which cooperates with the guide grooves on the partition and the rotating circle can rotate along the guide grooves, the fixed circle and the rotating circle have four grooves at the same position, after the fixed circle is installed on the rotating circle, the four condensers are exposed from the four grooves on the fixed circle.

[0019] The universal near-infrared spectrum detection device, wherein: the edge of the guide groove of the partition is provided with two notches at an interval of 180°, the locking block is placed in the notch and is acted upon by the thrust of the spring, the outer edges of the fixed ring and the rotating ring are provided with four positioning grooves at an interval of 90° at the same position, the positions of the positioning grooves and the notches coincide, the locking block is pushed into the positioning groove by the thrust of the spring, and is used to limit the rotational movement of the focusing plate rotating wheel; the lower edge of the locking block is inserted into the notch of the partition, and the upper edge of the locking block clamps the fixed ring. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Attached Figure 1 It is a schematic diagram of the shaft side structure of the present invention;

[0021] Attached Figure 2 is a side sectional view of the present invention;

[0022] Attached Figure 3 is a rear axle-side sectional view of the present invention;

[0023] Attached Figure 4 It is an axial sectional view of the transmission structure of the present invention;

[0024] Attached Figure 5 This is an axonometric exploded view of the light concentrator wheel structure of the present invention;

[0025] Attached Figure 6 This is an axonometric view of the optical fiber adjustment bracket of the present invention. DETAILED DESCRIPTION

[0026] The following is combined with Figure 1-6 , the specific implementation methods of the present invention are described in detail.

[0027] like Figure 1 As shown, the universal near-infrared spectrum detection device includes a control box 1 and a dark box 3. The control box 1 is placed in front of the dark box 3. The two box spaces are independent of each other and are connected together by screws, and both are fixed to the bottom plate 2 with screws.

[0028] like Figure 1-3As shown, the control box 1 includes: a spectrometer 7, a power supply 8, a motor control board 9, a host computer 10, and a fan 12 installed in the control box 1; a display screen 11, an emergency stop button 4, a motor speed control knob 5, a light source switch 6, a motor forward and reverse switch 30, a power interface 31, and a USB interface 32 installed on the control box casing.

[0029] The power supply 8 is connected to the power interface 31, and is used to provide 12V and 5V DC power to the host computer 10, the display screen 11, the spectrometer 7, the near-infrared light source 26, and the DC motor 37; the host computer 10 is connected to the display screen 11, the spectrometer 7 and the USB interface 32; the motor control board 9 is connected to the motor forward and reverse switch 30 and the motor speed knob 5. The power interface 31, the USB interface 32 and the motor forward and reverse switch 30 are installed on the side of the control circuit box 1 to avoid accidental touch. The display screen 11 is fixed to the center of the front upper part of the control circuit box 1 by screws, and the motor speed knob 5, the light source switch 6, and the emergency stop button 4 are also installed at the front upper part of the control box 1, and are distributed on both sides of the display 11 for easy operation. Ventilation holes are opened on the left and right sides and the lower front side of the control circuit box 1, and are covered with dustproof nets to reduce dust intrusion. The fan 12 is installed on the inner wall of the vent on the left side of the box to increase air convection inside the box.

[0030] like Figure 1-3 As shown, the dark box 3 includes a lid 13, an observation window 14, a hinge 15, a back cover 16, a sample box 33, a driven rubber-coated wheel 34, a ball core 35, a lower support plate 36 of a planar thrust bearing, an active rubber-coated wheel 38, an upper support plate 39 of a planar thrust bearing, a DC motor 37, a top cover 20, a top plate 21, an optical fiber adjustment bracket 23, an optical fiber 25, a near-infrared light source 26, a fixing frame 27, a tower radiator 28, a guide rail 17, an L-shaped support frame 18, a slider 19, a partition plate 24, a condenser wheel 40, a rotating circle 401, a fixing circle 402, a condenser 403, a locking block 404, a spring 405, a ventilation plate 29, and a fan 22.

[0031] The lid 13 is installed on the top of the dark box 3, and the observation window 14 is set in the middle of the lid 13. The lid 13 is connected to the back cover 16 of the box through the hinge 14. The lid 13 can rotate 180° around the hinge 14. The hinge 14 is a damping hinge, so the lid can hover at any angle. Two left and right ventilation plates 29 are arranged inside the dark box 3, which are fixed to the dark box 3 and the bottom plate 2 by screws. The two ventilation plates 29 are perpendicular to the bottom plate 2, and the two ventilation plates 29 are arranged parallel to each other. A top plate 21 is installed on the top of the two ventilation plates 29. The top cover 20 is fixed to the upper part of the top plate 21 by screw connection. At the same time, the top cover 20 is fixed to the dark box 3 by screw connection, and the top cover 20 is fixed to the top plate 21 by screw connection. A predetermined distance is separated between the top cover 20 and the top plate 21. The back cover 16 is installed on the two ventilation plates 29 and the bottom plate 2. A circular hole with the same diameter is opened at the same position between the top cover 20 and the top plate 21. A circular ring is welded on the circular hole of the top plate 21. The circular ring is interference-fitted with the lower support plate 36 of the plane thrust bearing, and then the lower support plate 36 of the plane thrust bearing is fixed to the top plate 21. The lower support plate 36 of the plane thrust bearing carries a ball core 35, and the ball core 35 includes a bearing retainer and a circle of 15 balls installed on the bearing retainer. The upper part of the ball core 35 is installed with the upper support plate 39 of the plane thrust bearing, and the ball core 35 is also installed with The driven rubber-coated wheel 34 is wrapped around the outer periphery of the support plate 39 on the plane thrust bearing. A groove is provided on the upper part of the support plate 39 on the plane thrust bearing. The sample box 33 is directly placed in the groove of the support plate 39 on the plane thrust bearing. The positioning pins provided on the edge of the sample box 33 are inserted into the positioning grooves on the edge of the groove of the support plate 39 on the plane thrust bearing. The support plate 39 on the plane thrust bearing can drive the sample box 33 to rotate. The bottom of the sample box 33 is made of highly light-transmitting quartz glass, so the light source can directly illuminate the sample surface from the inside of the darkroom 3.

[0032] like Figure 2 , 4 As shown in Figure 5, the DC motor 37 is fixed on the lower surface of the top plate 21, and the motor rotating shaft extends out through the circular hole of the top plate 21. An active rubber-coated wheel 38 is installed on the head of the rotating shaft. The installation position of the DC motor 37 allows the outer edge of the active rubber-coated wheel 38 to contact the driven rubber-coated wheel 34 wrapped by the outer edge of the support plate 39 on the plane thrust bearing, and ensures that the contact area meets the transmission requirements.

[0033] Inside the dark box 3, four guide rails 17 are fixed to the left and right ventilation plates 29 by screws, two guide rails 17 are installed on each ventilation plate 29, and a lockable slider 19 is installed on each guide rail 17, each slider 19 is fixed to the vertical plate of an L-shaped support frame 18, and the horizontal plate of the L-shaped support frame 18 is fixedly connected to the lower part of the partition plate 24, so the partition plate 24 can move up and down with the slider 19 and be fixed at any height, and a guide groove is provided on the partition plate 24, and the guide groove is a circular depression, and a circular hole with the maximum outer diameter of the near-infrared light source 26 is opened in the guide groove, and the near-infrared light source 26 is installed directly below the circular hole of the partition plate 24 through a fixing frame 27, and the fixing frame 27 is connected to the partition plate 24 by screws, and the near-infrared light source 26 is installed on the fixing frame 27, and there is a smooth surface below the fixing frame 27 that is in direct contact with the copper bottom of the tower radiator 28, so that the heat generated by the near-infrared light source 26 is quickly conducted to the tower radiator 28, and the fixing frame 27 is made of copper, so that the thermal conductivity efficiency is further improved. Ventilation holes are provided on the left and right ventilation plates 29, and ventilating holes are also provided on the left and right sides of the dark box 3 but are positioned higher than the ventilating holes on the ventilation plates 29 to prevent ambient light from irradiating the inside of the dark box. The ventilating holes of the dark box 3 are covered with dustproof nets to reduce dust intrusion while shielding ambient light. The fan 22 is installed in the ventilating hole on the left side of the dark box 3 to draw air outward.

[0034] The optical fiber adjustment bracket 23 is installed on the partition plate 24. One end of the optical fiber 25 is connected to the spectrometer 7, and the other end passes through the reserved hole on the partition plate 24 and is fixed by the optical fiber adjustment bracket 23, so as to face the irradiation point of the near-infrared light source 26. The optical fiber adjustment bracket 23 can adjust the height and angle of the optical fiber 25. The optical fiber adjustment bracket 23 includes a horizontal support frame 231 and a vertical support frame 232. The horizontal support frame 231 is divided into two sections, and the two sections can be relatively rotatably connected and can be locked by a locking nut 233 to adjust the angle of the optical fiber 25. The vertical support frame 232 is fixed to the partition plate 24 by threads. The vertical support frame 232 is inserted into the through hole at one end of the horizontal support frame 231, and the position of the horizontal support frame 231 is fixed by the locking nut 234. A through hole is also provided at the other end of the horizontal support frame 231. The optical fiber 25 is inserted into this through hole and the height of the optical fiber 25 is also fixed by the locking nut 235.

[0035] like Figure 3 , 6As shown, the partition plate 24 is also equipped with a condenser wheel 40, and the condenser wheel 39 includes a rotating circle 401, a fixed circle 402, a condenser 403, a locking block 404, and a spring 405. The rotating circle 401 is provided with four circular stepped holes, the lower step of the circular hole is equal to the maximum outer diameter of the lampshade of the near-infrared light source 26, and the upper step of the circular hole is slightly larger than the lower step of the circular hole, which is used to place condensers 403 with different focal lengths. The fixed circle 402 is provided with four circular holes, the positions of which are the same as the four circular stepped holes on the rotating circle 401 and the diameters are slightly smaller than the upper steps of the circular holes. After the fixed circle 402 is placed on the rotating circle 401, the four circular holes are respectively concentric, so that the condenser 403 is strictly fixed on the rotating circle 401. A circle of bosses is provided under the rotating circle 401, which is installed in the guide groove of the partition plate 24 and cooperates with the guide groove on the partition plate 24, so that the rotating circle 401 can rotate freely along the guide groove. The guide groove edge of the partition 24 is provided with two notches at an interval of 180°. The locking block 404 is placed in the notch and is acted upon by the thrust of the spring 405. The outer edges of the fixed ring 402 and the rotating ring 401 are provided with four positioning grooves at an interval of 90° at the same position. After the rotating ring 401 is rotated to select the focusing piece 403, the positioning groove coincides with the position of the notch. The locking block 404 is pushed into the positioning groove by the spring 405 to limit the rotational movement of the focusing piece rotating wheel 40, and the focusing piece 403 is completely concentric with the near-infrared light source 26. The lower edge of the locking block 404 is inserted into the notch of the partition 24, and the upper edge of the locking block 405 clamps the fixed ring 402, thereby completely fixing the rotating ring 401 and the fixed ring 402 on the partition 24.

[0036] The working principle and use process of the present invention are as follows: after the sample box 33 is filled with enough samples (such as flour, sand, soybean, etc.), the lid 13 is opened to place the sample box 33 on the groove of the support sheet 39 on the plane thrust bearing, so that the positioning pin on the sample box 33 is inserted into the positioning groove on the edge of the groove of the support sheet 39 on the plane thrust bearing, and the sample box 33 is positioned and driven to rotate at the same time, and the lid 13 is closed to prevent the external environment from interfering with the sample during the detection period, and the working condition of the sample box can be observed from the black observation window 14 during the operation. The rotation direction and speed of the motor 37 can be adjusted by the motor forward and reverse switch 30 and the motor speed knob 5, and the motor 37 drives the active rubber-coated wheel 38 to rotate. At the same time, due to the effect of friction, the active rubber-coated wheel 38 drives the driven rubber-coated wheel 34 and the support sheet 39 on the plane thrust bearing to rotate in the opposite direction on the ball core 35. Since the surface of the rubber-coated wheel is a viscoelastic material, it can be ensured that the transmission process has sufficient friction and does not generate impact vibration, ensuring that the transmission process is stable and accurate.

[0037] Turn on the power supply 8, use the light source switch 6 to turn on the near-infrared light source 26, the near-infrared light source 26 is located below the sample box 33 and directly irradiates the sample surface through the sample box 33, the optical fiber 25 can receive the sample reflected light and transmit it to the spectrometer 7, the spectrometer 7 is connected to the host computer 10, the spectrum curve can be observed through the display screen 11, the sample box 33 speed is adjusted, the acquisition parameters and the number of sampling times are set on the display 11, and the spectrum data can be collected. When the power supply 8 is turned on, the fan 12, the fan 22, and the tower radiator 28 start working immediately, and the tower radiator 28 efficiently dissipates heat for the near-infrared light source 26, the main heating element, and improves the heat dissipation efficiency with the fan 22 in the dark box, which weakens the influence of temperature on the spectrum data. If necessary, the USB port 32 can be used to connect the external device to the host computer 10 to meet a variety of usage requirements during the working process.

[0038] The rear cover 16 can be opened to adjust the internal structure of the dark box 3 for different detection objects. The position of the partition plate 24 can be changed by adjusting the height of the slider 19 on the guide rail 17. The near-infrared light source 26 and the optical fiber adjustment bracket 23 can also move up and down with the partition plate 24, so that the distance between the near-infrared light source 26 and the sample surface can be arbitrarily adjusted. To match the change in the height of the near-infrared light source 26, the optical fiber 25 probe always points to the irradiation center of the near-infrared light source 26. The height and angle of the optical fiber 25 probe can be flexibly controlled by the optical fiber adjustment bracket 23, so that the spectrometer 7 receives a light signal of sufficient intensity to ensure the accuracy of the spectrum detection results. As the distance between the near-infrared light source 26 and the sample surface increases, the irradiation range of the near-infrared light source 26 will continue to diverge. To ensure that the irradiation range of the near-infrared light source 26 is relatively concentrated, the condenser wheel 40 can be rotated to replace the condenser to adjust the focal length, which can enhance the light penetration without increasing the power of the near-infrared light source 26. The near-infrared light source 26 is installed under the partition plate 24 through a fixing bracket 27. The near-infrared light source 26 can be replaced by removing the fixing bracket 27. The selection of the power of the near-infrared light source 26 is particularly important for different detection objects. The appropriate light intensity can enable the spectrometer to receive spectral signals of sufficient intensity to ensure the accuracy of the spectral detection results.

[0039] Through the present invention, near-infrared spectroscopy can be performed on solid particles or powder samples, the sample box automatically rotates to achieve continuous multi-point uniform sampling, and the transmission structure is reliable and impact-free; the internal structure parameters are continuously adjustable, the focal length of the near-infrared light source can be adjusted to adapt to height changes, the instrument structure is stable and reliable to ensure the accuracy of spectral data; the heat dissipation system continuously and efficiently ventilates and dissipates heat, while preventing external light from entering the dark box to affect spectral collection.

Claims

1. A universal near-infrared spectrum detection device, comprising a control box and a dark box, wherein the control box is placed in front of the dark box, and the two boxes are independent and fixedly connected, characterized in that: The control box includes a spectrometer installed in the control box; the dark box includes a sample carrying device, a near-infrared light source and a light receiver; the near-infrared light source is used to irradiate the sample carrying device with light, and the light signal receiver is used to receive the light signal after passing through the sample carrying device, and send the received light signal to the spectrometer; The sample carrying device comprises a lower support sheet of a plane thrust bearing, a ball core, an upper support sheet of a plane thrust bearing, a driven rubber-coated wheel and an active rubber-coated wheel; the lower support sheet of the plane thrust bearing carries a ball core, the upper support sheet of the plane thrust bearing and the driven rubber-coated wheel are installed on the ball core, the driven rubber-coated wheel is wrapped on the upper support sheet of the plane thrust bearing, a groove is opened on the upper part of the upper support sheet of the plane thrust bearing, the active rubber-coated wheel is driven by a motor and contacts with the driven rubber-coated wheel; a positioning groove is provided on the edge of the groove of the upper support sheet of the plane thrust bearing, which is used to match the positioning pin on the edge of the sample box; a top plate is installed in the dark box body, and the lower support sheet of the plane thrust bearing is installed on the installation hole opened on the top plate; The universal near-infrared spectrum detection device also includes a partition plate, each ventilation plate is equipped with two guide rails, each guide rail is equipped with a lockable slider, and each slider is fixedly connected to the lower part of the partition plate; an optical fiber adjustment bracket is installed on the partition plate, one end of the optical fiber is connected to the spectrometer, and the other end passes through the reserved hole on the partition plate and is fixed by the optical fiber adjustment bracket; A condenser wheel is also provided on the partition plate; the condenser wheel comprises a rotating circle, a fixed circle, a condenser, a locking block and a spring; four circular stepped holes are provided on the rotating circle, the lower step of the circular hole is equal to the maximum outer diameter of the near-infrared light source, the upper step of the circular hole is slightly larger than the lower step of the circular hole, and condensers with different focal lengths are placed on the upper step of the circular hole; the condenser is fixed on the rotating circle through a fixed circle, a circle of bosses is provided under the rotating circle, which cooperates with the guide grooves on the partition plate and the rotating circle can rotate along the guide grooves, the fixed circle and the rotating circle have four grooves at the same position, and after the fixed circle is installed on the rotating circle, the four condensers are exposed from the four grooves on the fixed circle.

2. The universal near-infrared spectrum detection device according to claim 1, characterized in that: The control box includes a power supply, a motor control board, a host computer, and a fan installed in the control box.

3. The universal near-infrared spectrum detection device according to claim 1, characterized in that: Two left and right ventilation panels are arranged inside the dark box body.

4. The universal near-infrared spectrum detection device according to claim 1, characterized in that: Also includes dividers.

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