Multi-channel laser beam intersection precipitation rate detection device and method

Abstract

The application discloses a kind of multi-channel laser shot deposition rate detection device and method, belong to particulate material deposition characteristic detection equipment technical field.The device includes detection tank and laser shot unit;Laser shot unit includes laser transmitter and laser receiver, both are respectively set on the outer wall of detection tank opposite two sides, and coaxial alignment;Laser shot unit is set multiple, and is arranged along the outer wall of detection tank axial interval;Detection tank inside is provided with piston, piston is connected with motor for driving it to move up and down along the inner wall of detection tank;Detection tank bottom is provided with fluid inlet and outlet;Laser receiver is connected with data processor, motor is connected with position recording module, data processor, position recording module is connected with computer respectively.The device is driven by motor piston rod positioning initial liquid level, by external multi-channel laser synchronous acquisition interface deposition time, by computer fitting deposition rate, it is suitable for mining, environmental protection and chemical industry field suspension deposition analysis.

Description

Technical Field

[0001] This invention belongs to the technical field of particulate material sedimentation characteristic detection equipment, specifically relating to a multi-channel laser-guided sedimentation rate detection device and method. Background Technology

[0002] In industries such as mineral processing, water treatment, and chemicals, the settling rate of turbid materials is a key process parameter, directly affecting the selection of settling equipment, process optimization, and production efficiency. Existing methods for measuring settling rate mainly include gravity settling, centrifugal settling, and laser particle size analyzer-assisted methods, but they generally suffer from low detection accuracy, limited data dimensions, and poor operational controllability. For example, the traditional gravity settling method relies on manual, timed observation of the settling interface height to calculate the rate. A single experiment typically only obtains rate data for a limited height or a single stage, making it difficult to reflect the dynamic differences between different settling stages and different height levels, resulting in insufficient data completeness. Furthermore, manual observation is significantly affected by the reading angle, the degree of interface ambiguity, and the recording time, leading to significant subjective errors and making real-time continuous monitoring difficult, resulting in low detection efficiency.

[0003] To overcome the limitations of manual observation, existing laser-based measuring instruments mostly employ a single optical path or a moving scanning structure. Although such structures can sequentially detect at different heights, they are essentially still the same optical path collecting data at different time points. There are scanning time differences and repetitive positioning errors between signals at different heights. This makes it difficult to obtain strictly synchronized signals from multiple height points during the same settlement process, thus hindering the accurate plotting of segmented settlement rate curves as the same settlement interface passes through adjacent heights, limiting the precise characterization of settlement dynamics.

[0004] Furthermore, existing devices often employ manual sample addition or direct pouring to inject samples, making it difficult to precisely standardize the initial liquid level and initial settling height. Liquid surface disturbances are easily generated during sample injection, and the lack of a precise control mechanism for determining "from which height settling begins" makes it difficult to maintain consistent initial conditions across different batches of experiments. For suspensions such as coal slurry and mineral slurry, where the settling interface changes rapidly and particles easily adhere, this problem further amplifies the calculation error of the settling rate, severely impacting the repeatability and reliability of the measurement results. Moreover, while some laser detection devices integrate the receiving component inside the container or apply a light-absorbing coating to the container wall to reduce stray light interference to some extent, this hinders the visualization, cleaning, and maintenance of the transparent detection tank and limits the device's versatility in detecting various suspension material systems. Summary of the Invention

[0005] Based on the above-mentioned technical problems, the present invention proposes a multi-channel laser beam settling rate detection device and method.

[0006] The technical solution adopted in this invention is: First, the present invention provides a multi-channel laser beam settling rate detection device, including a detection tank and a laser beam unit; the laser beam unit includes a laser emitter and a laser receiver, the laser emitter and the laser receiver are respectively disposed on opposite outer walls of the detection tank, and the two are coaxially aligned; Multiple sets of laser beam-emitting units are provided and arranged at axial intervals along the outer wall of the detection tank. The detection tank is equipped with a piston, which is connected to a motor that drives it to move up and down along the inner wall of the detection tank; the bottom of the detection tank is provided with a fluid inlet and outlet. The laser emitter and laser receiver are respectively connected to the data processor, which is connected to the computer; the motor is connected to the position recording module, which is also connected to the computer.

[0007] Preferably, the laser beam unit is provided in 4-12 groups.

[0008] Preferably, the output end of the motor is connected to the piston rod and the stirring rod respectively; the bottom end of the piston rod is connected to the piston, and the stirring rod passes through the piston and is connected to the stirrer located below the piston.

[0009] Preferably, the fluid inlet and outlet are equipped with shut-off valves to control the fluid flow rate.

[0010] Preferably, the detection container is made of a transparent material, so that each laser beam unit forms a laser path inside the detection container.

[0011] Secondly, the present invention also provides a multi-channel laser beam deposition rate detection method, which uses the above-mentioned device and includes the following steps: (1) Start the data processor, calibrate the detection tank, and record the initial transmitted light intensity I0 of the laser channel formed by each laser beam unit; (2) Adjust the shut-off valve and start the motor so that the piston rod and stirring rod drive the piston and stirrer to move upward respectively. The fluid to be tested enters the detection tank through the fluid inlet and outlet under the suction action of the piston. When the initial position of the fluid reaches the preset laser channel, the motor stops and the position recording module records the initial position H0. Then start the motor so that the stirring rod drives the stirrer to move up and down to stir the fluid in the detection tank. After the stirring is completed, the position recording module records the laser channel number and the start time t0 corresponding to the initial position. The above initial position refers to the position corresponding to the upper liquid surface of the fluid inside the detection tank. (3) The sedimentation measurement stage begins at the initial position H0 and the starting time t0. The data processor synchronously collects the transmitted light intensity signal of the laser channel formed by each laser beam unit (referring to the laser beam unit that the fluid to be measured can cover inside the detection tank) and transmits it to the computer in real time. (4) The computer calculates the average settlement rate v based on the data collected from the location recording module and the data processor. i The segmented settlement rate v was then used to obtain the settlement rate curve.

[0012] Preferably, the wavelength of the laser emitted by the laser beam-emitting unit is 650-980 nm and the emission power is 5-20 mW.

[0013] Preferably, in step (3): the settling interface is identified by the threshold point or inflection point of the curve obtained by fitting the transmitted light intensity of each laser channel collected by the computer.

[0014] Preferably, the average settlement rate v in step (4) i Calculate according to the following formula: v i =(H0-H i ) / (t i -t0), where i represents the number of laser channels traversed by the settling interface, v i H represents the average settling velocity of the settling interface from its initial position to the i-th laser channel. i Let t be the height of the i-th laser channel. i This represents the time from the initial position of the settling interface to the i-th laser channel.

[0015] Preferably, the segmented settling rate in step (4) is calculated according to the following formula: v=Δh / Δt, where Δh is the height difference between adjacent laser channels and Δt is the time taken for the settling interface to pass through the adjacent laser channels.

[0016] The beneficial technical effects of the present invention are as follows: This invention provides a sedimentation rate measuring device with adjustable starting position, low-disturbance liquid extraction, and simultaneous detection at multiple heights. This device allows the liquid to be stably extracted to a preset laser channel height and begin sedimentation from that recordable position, thereby improving the accuracy and repeatability of sedimentation rate measurement. Specifically: (1) Controllable starting position: The piston rod is driven by a controllable motor to move upward to draw liquid, and the liquid to be tested can be stably drawn to any preset laser beam channel position, and the starting position H0 and starting time t0 are recorded, avoiding the deviation of the starting height caused by manual reading or simple negative pressure suction.

[0017] (2) Small sample disturbance and good repeatability: The suction process formed by the piston moving upward is relatively stable. The sample enters the detection area from the bottom or the lower side, which can reduce the liquid surface disturbance caused by direct pouring or rapid pumping. At the same time, for non-uniform liquids, a stirrer can be used to stir, which improves the repeatability of sedimentation rate determination of different batches.

[0018] (3) Achieve synchronous detection at multiple heights: Multiple sets of external fixed laser beam units do not move during the detection process, and can synchronously acquire the changes in transmitted light intensity at different height levels, avoiding the time difference and repeated positioning error caused by the movement and scanning of a single optical path.

[0019] (4) More complete rate calculation path: The system can calculate the rate from H0 to each channel H. i The average settlement rate can be calculated using the height difference and time difference. Alternatively, the segmented settlement rate can be calculated based on the height difference Δh and time difference Δt between adjacent channels, and the computer can further fit the settlement rate-time curve and the settlement rate-height curve.

[0020] (5) External optical path facilitates maintenance: The laser emitter and receiver are both located on the outside of the transparent detection tank and do not come into direct contact with the suspension, which can reduce the risk of the receiver being contaminated by particles, scaled or corroded; the detection tank is kept transparent, which makes it easy to manually check the sedimentation interface and observe abnormal phenomena.

[0021] (6) Convenient and efficient maintenance: The top or upper side water flushing pipe is combined with the bottom liquid inlet and outlet structure to flush the inner wall of the transparent detection tank and the detection area below the piston in situ, reducing the impact of easily adhering materials such as coal slurry and mineral slurry on subsequent detection. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the structural principle of the multi-channel laser beam sedimentation rate detection device in Embodiment 1 of the present invention; Figure 2 This is a schematic diagram of the structural principle of the multi-channel laser beam settling rate detection device in Embodiment 2 of the present invention; Figure 3 for Figure 2 Top view of the mixer; Figure 4 This is a flowchart of the multi-channel laser-guided sedimentation rate detection method in Embodiment 3 of the present invention.

[0023] In the diagram: 1-Controllable motor; 2-Adjustable piston rod; 3-Sealed piston; 4-Agitator; 5-Laser receiver; 6-Laser emitter; 7-Synchronous data processor; 8-Computer terminal; 9-Transparent detection tank; 10-Inlet / outlet pipe; 11-Position recording module; 12-Stop valve; 13-Clean water flushing pipe; 14-Adjustable stirring rod; 15-Fluid storage tank. Detailed Implementation

[0024] The present invention will be further described below with reference to the accompanying drawings and specific embodiments.

[0025] Example 1 like Figure 1As shown, a multi-channel laser beam settling rate detection device includes a transparent detection tank 9 and a laser beam unit; the laser beam unit includes a laser emitter 6 and a laser receiver 5, which are respectively disposed on opposite outer walls of the transparent detection tank 9 and are coaxially aligned.

[0026] The laser beam unit is provided in multiple groups, preferably 4-12 groups; each group of laser beam units is arranged axially at intervals along the outer wall of the transparent detection tank 9; Figure 1 In the middle, there are 6 sets of laser beam units.

[0027] The aforementioned laser beam unit is the core detection component. Each unit consists of a semiconductor laser emitter and a photodiode receiver, with a laser wavelength of 650-980 nm and an emission power of 5-20 mW. Each emitter and receiver is respectively arranged on the outer side of both sides of the transparent detection tank 9, forming an H1-H pattern along the height direction. n Multiple horizontal beam paths; the spacing between adjacent channels can be 10-50mm, or non-equidistant spacing can be arranged according to the settlement range; each channel is fixed during the detection process, and the height and coaxiality can be adjusted by an external adjustable fixed bracket.

[0028] The transparent testing tank 9 is equipped with a sealed piston 3 inside, which is connected to a controllable motor 1 for moving it up and down along the inner wall of the testing tank; the controllable motor 1 is connected to a position recording module 11, and the controllable motor 1 and the position recording module 11 are also connected to a computer terminal 8 respectively; the bottom of the transparent testing tank 9 is provided with a fluid inlet and outlet, and the fluid inlet and outlet are connected in series with a shut-off valve 12 and an inlet and outlet pipe 10, wherein the shut-off valve 12 is used to control the discharge of materials and cleaning water.

[0029] The output end of the controllable motor 1 is connected to the adjustable piston rod 2, and the bottom end of the adjustable piston rod 2 is connected to the sealing piston 3.

[0030] The aforementioned controllable motor 1 is positioned above the transparent testing tank 9 and can be a servo motor, stepper motor, or linear drive motor with an encoder. The motor drives the adjustable piston rod 2 to move up and down along the axial direction of the transparent testing tank 9 via a lead screw, rack, synchronous belt, or linear module, thereby further driving the sealing piston 3 connected to the bottom to move up and down. In this embodiment, the motor drives the adjustable piston rod 2 to move up and down along the axial direction of the transparent testing tank 9 via a lead screw, thereby driving the sealing piston 3 to move up and down along the inner wall of the testing tank. A specific design could be adopted as follows: the motor output shaft drives the vertical lead screw to rotate, and a lead screw nut matching the lead screw is fixedly installed at the top of the piston rod, thereby converting the rotational motion of the lead screw into linear reciprocating motion of the piston rod along the axial direction of the transparent testing tank 9, realizing the lifting and lowering adjustment of the sealing piston 3. Before testing, the controllable motor 1 drives the sealed piston 3 to move upward, creating a suction effect inside the testing tank. The suspension to be tested enters the testing area through the inlet and outlet pipes 10. Of course, the inlet and outlet pipes 10 are also used to discharge the suspension after testing. When the liquid is drawn to the preset laser beam channel height, the motor stops, and the position recording module 11 records the starting position H0 and the starting time t0. By changing the motor stopping position, different laser channels can be selected as the sedimentation starting point.

[0031] The synchronous data processor 7 is connected to each laser receiver 5 and laser transmitter 6 to synchronously acquire the light intensity signals of each channel and convert them into digital signals through A / D conversion. The synchronous data processor 7 can calibrate the initial unobstructed light intensity I0 of each channel and record the change of normalized transmitted light intensity I(t) / I0 in real time during the detection process.

[0032] The synchronization data processor 7 and the position recording module 11 are respectively connected to the computer terminal 8; the computer terminal 8 receives data transmitted by the synchronization data processor 7 and the position recording module 11; the computer terminal 8 is also connected to the controllable motor 1 for controlling the operation of the motor. When the settlement interface passes through a certain height channel H i At that time, the transmitted light intensity of the channel showed a significant change, and the computer fitting terminal recorded the arrival time t of the channel interface. i The terminal can calculate the average settlement rate v from the starting point to each channel based on the starting position H0 and the starting time t0. i =(H0-H i ) / (t i -t0), the segmented settlement rate v=Δh / Δt can also be calculated based on the height difference and time difference between adjacent channels, and the settlement rate-time curve and settlement rate-height curve can be further fitted.

[0033] The aforementioned transparent testing container 9 is made of glass, quartz, or transparent acrylic glass, and has a vertical sedimentation testing zone inside for holding the suspension to be tested. The outer wall of the testing container remains transparent, eliminating the need for a large area of ​​light-absorbing coating inside and outside the container wall, which facilitates observation of the sedimentation interface and is suitable for different types of samples.

[0034] Furthermore, the upper part of the transparent testing tank 9 is provided with a cleaning water pipeline interface for connecting to the external cleaning water pipeline 13, so the inlet and outlet pipes 10 are also used for the discharge of cleaning water.

[0035] Example 2 like Figure 2 As shown, based on the structure of Example 1, the following design was also made: The output end of the controllable motor 1 is also connected to the adjustable stirring rod 14. A hole is provided on the sealing piston 3 for the adjustable stirring rod 14 to pass through, and a sealing ring is installed in this hole to achieve dynamic sealing during the reciprocating motion of the adjustable stirring rod 14. The adjustable stirring rod 14 passes through the hole on the piston and is connected to the stirrer 4 located below the piston. The stirrer 4 can share a motor with the sealing piston 3, and this motor has an independent control system that can control the lifting and lowering of the stirrer 4 and the sealing piston 3 respectively. Alternatively, the stirrer 4 can be driven by a separate motor, i.e., the motor drives the adjustable stirring rod 14 to move up and down along the axial direction of the transparent detection tank 9 through a transmission device such as a lead screw, rack, synchronous belt, or linear module, thereby further driving the up and down movement of the stirrer 4. In this embodiment, the motor also drives the stirrer 4 to move up and down through a lead screw, and the specific design is consistent with Embodiment 1.

[0036] In this embodiment, before testing, the motor drives the sealing piston 3 and the stirrer 4 to move upward together, so that the inside of the test tank forms a suction effect. The suspension to be tested enters the test area through the inlet and outlet pipes 10. When the suspension to be tested settles too quickly or unevenly, the stirrer 4 can be started alone to move up and down to achieve the stirring effect.

[0037] The aforementioned stirrer 4 has a disc-shaped structure, with multiple circular through holes in the central area of ​​the disc body; for example... Figure 3 As shown, the stirrer 4 has four circular through holes of equal size in the central area of ​​the disc body, and the four through holes are evenly distributed with the center of the disc as the symmetrical point.

[0038] Example 3 like Figure 4 As shown, a multi-channel laser beam settling rate detection method, using the above-mentioned device, includes the following steps: (1) Equipment debugging: Adjust the external adjustable fixed bracket to make each group of laser emitters 6 and laser receivers 5 coaxially aligned; start the synchronous acquisition system to calibrate with empty tank or clean water, and record the initial transmitted light intensity I0 of each channel.

[0039] (2) Piston pumping and positioning: Open the inlet and outlet pipes 10 and close or adjust the shut-off valve 12. Start the controllable motor 1, so that the adjustable piston rod 2 and the adjustable stirring rod 14 drive the sealed piston 3 and the stirrer 4 to move upward respectively. The suspension to be tested enters the transparent detection tank 9 under the suction action. When the initial position of the liquid reaches the preset laser channel, the motor stops, the position recording module 11 records the initial position H0, and then the motor drives the stirrer 4 to move up and down to stir. After stirring is completed, the stirrer 4 returns to the original position. At this time, the corresponding channel number and the start time t0 of the liquid are recorded.

[0040] (3) Initial settlement detection: Starting from position H0, the settlement measurement stage begins. The synchronous data processor 7 synchronously collects the transmitted light intensity signal of each fixed height optical path and transmits it to the computer terminal 8 in real time.

[0041] (4) Rate calculation and fitting: The computer fitting terminal identifies the interface arrival time t based on the threshold point or inflection point of the transmitted light intensity curve of each channel. i Combining H0 and H i The average settlement rate and segmented settlement rate are calculated based on the height difference Δh between adjacent channels, and the settlement rate curve is further obtained by fitting.

[0042] (5) End of test and cleaning: After the test is completed, open the shut-off valve 12 to discharge the material; open the clean water flushing pipe 13 to flush the inner wall of the transparent test tank 9 and the test area below the piston in situ. The cleaning water is discharged through the inlet and outlet pipes 10 and flows into the fluid storage tank 15.

[0043] For any parts not mentioned in the above embodiments, existing technologies can be adopted or referenced.

[0044] Of course, the above description is not intended to limit the present invention, and the present invention is not limited to the above embodiments. Any changes, modifications, additions or substitutions made by those skilled in the art within the scope of the present invention should be protected by the present invention.

Claims

1. A multi-channel laser-guided sedimentation rate detection device, characterized in that, It includes a detection tank and a laser beam unit; the laser beam unit includes a laser emitter and a laser receiver, which are respectively disposed on opposite outer walls of the detection tank and are coaxially aligned. Multiple sets of laser beam-emitting units are provided and arranged at axial intervals along the outer wall of the detection tank. The detection tank is equipped with a piston, which is connected to a motor that drives it to move up and down along the inner wall of the detection tank; the bottom of the detection tank is provided with a fluid inlet and outlet. The laser emitter and laser receiver are respectively connected to the data processor, which is connected to the computer; the motor is connected to the position recording module, which is also connected to the computer.

2. The multi-channel laser-guided sedimentation rate detection device according to claim 1, characterized in that, The laser beam unit is configured in 4-12 groups.

3. The multi-channel laser-guided sedimentation rate detection device according to claim 1, characterized in that, The output end of the motor is connected to the piston rod and the stirring rod respectively; the bottom end of the piston rod is connected to the piston, and the stirring rod passes through the piston and is connected to the stirrer located below the piston.

4. The multi-channel laser-guided sedimentation rate detection device according to claim 1, characterized in that, The fluid inlet and outlet are equipped with shut-off valves to control the fluid flow rate.

5. The multi-channel laser-guided sedimentation rate detection device according to claim 1, characterized in that, The detection container is made of transparent material, which allows each laser beam unit to form a laser path inside the detection container.

6. A method for detecting sedimentation rate using a multi-channel laser beam, employing the apparatus described in any one of claims 1-5, characterized in that, Includes the following steps: (1) Start the data processor, calibrate the detection tank, and record the initial transmitted light intensity I0 of the laser channel formed by each laser beam unit; (2) Adjust the shut-off valve and start the motor so that the piston rod and stirring rod drive the piston and stirrer to move upward respectively. The fluid to be tested enters the detection tank through the fluid inlet and outlet under the suction action of the piston. When the initial position of the fluid reaches the preset laser channel, the motor stops and the position recording module records the initial position H0. Then the motor is started, which causes the stirring rod to move the stirrer up and down to stir the fluid in the detection tank. After stirring is completed, the position recording module records the laser channel number and start time t0 corresponding to the initial position. (3) The sedimentation measurement stage begins at the initial position H0 and the starting time t0 of the sedimentation interface. The data processor synchronously collects the transmitted light intensity signal of the laser channel formed by each laser beam unit and transmits it to the computer in real time. (4) The computer calculates the average settlement rate v based on the data collected from the location recording module and the data processor. i The segmented settlement rate v was then used to obtain the settlement rate curve.

7. The method for detecting multi-channel laser-guided sedimentation rate according to claim 6, characterized in that, The laser emitted by the laser beam-emitting unit has a wavelength of 650-980 nm and an emission power of 5-20 mW.

8. The method for detecting multi-channel laser-guided sedimentation rate according to claim 6, characterized in that, In step (3): the settling interface is identified by the threshold point or inflection point of the curve obtained by fitting the transmitted light intensity of each laser channel collected by the computer.

9. The multi-channel laser beam sedimentation rate detection method according to claim 6, characterized in that, The average settlement rate v mentioned in step (4) i Calculate according to the following formula: v i =(H0-H i ) / (t i -t0), where i represents the number of laser channels traversed by the settling interface, v i H represents the average settling velocity of the settling interface from its initial position to the i-th laser channel. i Let t be the height of the i-th laser channel. i This represents the time from the initial position of the settling interface to the i-th laser channel.

10. The method for detecting multi-channel laser-guided sedimentation rate according to claim 6, characterized in that, The segmented settling rate in step (4) is calculated according to the following formula: v=Δh / Δt, where Δh is the height difference between adjacent laser channels and Δt is the time taken for the settling interface to pass through the adjacent laser channels.

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