Centrifuge feeding device based on image monitoring

Abstract

The utility model discloses a centrifugal machine feeding device based on image monitoring, which relates to the field of centrifugal equipment and comprises a detection camera, a controller module and a regulating valve, the detection camera is used for acquiring a filter cake chromaticity signal of a centrifugal machine and sending the filter cake chromaticity signal to the controller module, and the regulating valve is used for regulating the filter cake chromaticity signal. The controller module is used for comparing the filter cake chromaticity signal with a pre-stored gear signal and judging the feeding flow in real time; according to the condition of the filter cake, the controller module controls the opening degree of the regulating valve so as to regulate the feeding flow; when the filter cake chromaticity signal is smaller than the normal gear, the feeding flow is increased, and when the filter cake chromaticity signal is larger than the normal gear, the feeding flow is reduced; when the chromaticity signal of the filter cake is in a normal gear, the feeding amount is maintained; therefore, the feeding flow is matched with the real-time state of the filter cake, and the purpose of automatically adjusting the feeding flow is achieved.

Description

Technical Field

[0001] The utility model relates to the field of centrifugal equipment, and further relates to a centrifuge feeding device based on image monitoring. Background Art

[0002] Centrifuges are typically fed by gravity. Manually pressing a button on the control box causes the feed ball valve to frequently open and close to control the feed rate per unit time. This operation requires experienced centrifuge operators to observe the thickness and color of the filter cake on the centrifuge drum through a sight glass, judging the feed status based on the thickness and color until feeding is complete. Frequently opening and closing the ball valve can lead to uneven feeding and high labor input. Due to varying manual control experience and reduced filter cloth efficiency, the feed frequency and speed can be unstable. Feeding too quickly risks overflow and blocking the exhaust line, while feeding too slowly can result in substandard product moisture.

[0003] For those skilled in the art, how to improve the automation of the centrifuge feeding process is a technical problem that needs to be solved at present. Utility Model Content

[0004] The utility model provides a centrifuge feeding device based on image monitoring, which can automatically detect and identify filter cakes, and use this as the basis for regulating the opening of the regulating valve, thereby improving the automation of the centrifuge feeding process. The specific scheme is as follows:

[0005] A centrifuge feeding device based on image monitoring, comprising a detection camera, a controller module and a regulating valve, wherein the detection camera is used to obtain a filter cake color signal from the centrifuge and send the filter cake color signal to the controller module;

[0006] The controller module is used to compare the filter cake chromaticity signal with the pre-stored gear signal to determine the size of the feed flow rate;

[0007] The controller module is used to control the opening of the regulating valve to adjust the feeding flow rate; when the filter cake chromaticity signal is less than the normal gear, the feeding flow rate is increased; when the filter cake chromaticity signal is greater than the normal gear, the feeding flow rate is reduced; when the filter cake chromaticity signal is in the normal gear, the feeding amount is maintained.

[0008] Optionally, the filter cake chromaticity signal is a chromaticity value obtained through RGB values.

[0009] Optionally, the chromaticity value is divided into 1, 2, and 3 levels according to the numerical range of RGB; the chromaticity value range of the normal gear is 2-2.5, the opening is reduced when the chromaticity value is below 2, and the opening is increased when the chromaticity value is above 2.5.

[0010] Optionally, the detection camera captures the image of the filter cake from obliquely above.

[0011] Optionally, the initial opening of the regulating valve is 30%.

[0012] Optionally, the detection camera is used to obtain a thickness signal of the filter cake and send the thickness signal to the controller module;

[0013] The controller module determines the filter cake accumulation process according to the thickness signal.

[0014] Optionally, when the controller module determines that the filter cake thickness reaches 100%, the opening of the regulating valve is closed to 0%.

[0015] Optionally, when the filter cake thickness reaches 100%, the chroma reaches 2 or above, and the regulating valve is closed to 0%, the controller module outputs a signal to indicate that the feeding is completed.

[0016] The utility model provides a centrifuge feeding device based on image monitoring, which comprises a detection camera, a controller module and a regulating valve. The detection camera is used for acquiring a filter cake chromaticity signal of the centrifuge and sending the filter cake chromaticity signal to the controller module. The controller module compares the filter cake chromaticity signal with a pre-stored gear signal and judges the size of the feed flow in real time. According to the condition of the filter cake, the controller module controls the opening of the regulating valve to adjust the feed flow. When the filter cake chromaticity signal is less than the normal gear, the feed flow is increased. When the filter cake chromaticity signal is greater than the normal gear, the feed flow is reduced. When the filter cake chromaticity signal is in the normal gear, the feed amount is maintained. Thus, the feed flow is matched with the real-time condition of the filter cake, thereby achieving the purpose of automatically adjusting the feed flow. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0018] Figure 1 A schematic diagram of the centrifuge feeding device based on image monitoring provided by the present invention applied to a centrifuge;

[0019] Figure 2 Schematic diagram of the filter cake detected by the detection camera;

[0020] Figure 3 This is the control principle diagram of the closed-loop feedback system.

[0021] The diagram includes:

[0022] Detection camera 1, controller module 2, regulating valve 3, filter cloth 4. DETAILED DESCRIPTION

[0023] The core of the utility model is to provide a centrifuge feeding device based on image monitoring, which can automatically detect and identify filter cakes, use this as a basis for regulating the opening of the regulating valve, and improve the automation of the centrifuge feeding process.

[0024] In order to enable those skilled in the art to better understand the technical solution of the present invention, the centrifuge feeding device based on image monitoring of the present invention will be described in detail below with reference to the accompanying drawings and specific implementation methods.

[0025] The utility model provides a centrifuge feeding device based on image monitoring, combined with Figure 1 As shown, the system includes a detection camera 1, a controller module 2, and a regulating valve 3. The detection camera 1 is oriented toward the filter cake to capture images of the filter cake. The controller module 2 is used to receive signals and send control instructions. The regulating valve 3 is located at the feed inlet of the centrifuge drum and is used for feeding. The controller module 2 controls the opening of the regulating valve 3. A larger opening of the regulating valve 3 increases the feed flow rate.

[0026] Detection camera 1 is used to capture the filter cake color signal from the centrifuge and transmit it to controller module 2. Controller module 2 receives the filter cake color signal from detection camera 1 and makes a judgment based on the color of the filter cake. The centrifuge is filled with a solid-liquid mixture. As the centrifuge's drum rotates, the material inside is dispersed by centrifugal force. Filter cloth 4 is installed within the drum, blocking solid particles and filtering them. The liquid is then discharged through the cloth due to centrifugal force. The filter cake is a solid layer deposited on the surface of the filter cloth 4 during the centrifugation process, which thickens continuously as the centrifuge progresses.

[0027] Controller module 2 is used to compare the filter cake color signal with a pre-stored shift signal to determine the feed flow rate; the pre-stored shift signal represents a color range, and the feed flow rate is adjusted based on the color depth. When the drum rotation speed is constant, if the feed flow rate is low, centrifugal force rapidly drains water from the mixed liquor, causing solid particles to quickly deposit on the filter cloth 4, resulting in a whiter color on the latest deposition surface captured by camera 1. When the feed flow rate is high, centrifugal force prevents the mother liquor from the mixed liquor from being rapidly drained, forming a certain solid-liquid mixture on the deposition surface of the filter cloth 4, resulting in a darker color on the latest deposition surface captured by camera 1.

[0028] Controller module 2 controls the opening of regulating valve 3 to adjust the feed flow rate. When the filter cake color signal is less than the normal range, the color is whiter than normal, the feed flow rate is less than the drum can handle, and a white solid deposit is rapidly formed. In this case, the feed flow rate should be increased. When the filter cake color signal is greater than the normal range, the color is darker than normal, the feed flow rate is greater than the drum can handle, and the feed flow rate should be reduced. When the filter cake color signal is at the normal range, the feed rate is maintained unchanged. By continuously monitoring the filter cake at regular intervals (e.g., 10ms), the feed flow rate can be continuously adjusted in real time.

[0029] The color of the most recently deposited surface on the filter cloth 4 is shown above using the example of a sodium sulfite centrifuge process. When applied to other types of mixed liquids, the colors may differ, but the basic principle remains the same. The present invention automatically adjusts the feed flow rate by matching the filter cake's color to its real-time state.

[0030] The utility model adopts PID closed-loop feedback system control, refer to Figure 3 As shown, it is a schematic diagram of the principle of the closed-loop feedback system; the controlled object is the regulating valve 3, the measuring and transmitting element is the detection camera 1, and the controller module 2 includes a comparison element and a controller. The controller is used to output control commands, and the comparison element is used to compare the colorimetric signal and the thickness signal.

[0031] Specifically, the filter cake chromaticity signal in the present invention is a chromaticity value derived from RGB values. The RGB color model is an industry-standard color model that produces a wide variety of colors by varying and superimposing the three color channels: red (R), green (G), and blue (B). This standard encompasses nearly all colors perceptible by human vision and is currently one of the most widely used color systems. The R (red), G (green), and B (blue) values each have a minimum value of 0 and a maximum value of 255. (0, 0, 0) represents the darkest possible color, and (255, 255, 255) represents the whitest possible color.

[0032] Of course, other color modes may also be used, and corresponding parameter values need to be changed accordingly.

[0033] Furthermore, the chromaticity values are divided into levels 1, 2, and 3 based on the RGB numerical range; the chromaticity value range for the normal gear is 2-2.5, and the opening is reduced for values below 2, and increased for values above 2.5. Setting three chromaticity levels is a specific form, and a larger number of levels can be used, all of which are within the scope of protection of this utility model.

[0034] Combine Figure 1As shown, the detection camera 1 captures the image of the filter cake from obliquely above. The detection camera 1 can also obtain the total thickness of the entire filter cake by capturing the chromaticity value of the latest deposition surface position on the filter cloth 4 surface.

[0035] The initial opening of the regulating valve 3 is 30%, which is used as the initial value, and the feed flow rate is adjusted in real time according to the chromaticity.

[0036] Based on any of the above technical solutions and their mutual combinations, the detection camera 1 of the present invention is used to obtain the thickness signal of the filter cake and send the thickness signal to the controller module 2. The controller module 2 determines the filter cake accumulation process according to the thickness signal, presets the maximum deposition thickness in the controller module 2, and compares the thickness signal with the maximum deposition thickness. When the thickness signal reaches the maximum deposition thickness, it indicates that the deposition thickness has reached the maximum value, indicating that no more thickness needs to be accumulated; when the controller module 2 determines that the filter cake thickness reaches 100%, the opening of the regulating valve 3 is closed to 0%.

[0037] Controller Module 2 comprehensively assesses the filter cake thickness, chromaticity, and the opening of Control Valve 3. When the filter cake thickness reaches 100%, the chromaticity reaches 2 or higher, and Control Valve 3 is closed to 0%, Controller Module 2 outputs a signal indicating that feeding is complete. If the filter cake thickness reaches 100% but the chromaticity does not reach 2, indicating that there is still liquid to be centrifuged, Control Valve 3 remains closed and no further feed is added. The centrifuge continues for a period of time until all three conditions are met: filter cake thickness reaches 100%, chromaticity reaches 2 or higher, and Control Valve 3 is closed to 0%, at which point the centrifuge stops.

[0038] Using the centrifuge feeding device based on image monitoring of the present invention, taking sodium sulfite centrifugation as an example, the following process can be performed:

[0039] Step 1: Material identification is performed using a camera's computer vision algorithm. The RGB (red, green, and blue) values of the pixels in the image are extracted and analyzed. The RGB value of each pixel represents the brightness of the three components: red, green, and blue. By combining these values, various colors can be identified. The RGB values are used to determine a fixed chromaticity value and position (thickness). During the sodium sulfite centrifugation process, the chromaticity value is divided into levels 1, 2, and 3 based on the RGB value range, and the thickness range is 0-100%.

[0040] Step 2: Set the color value range of the normal process to 2-2.5. If it is lower than 2, it is considered that the instantaneous feeding amount is too large. If it is too large continuously, it will overflow into the exhaust pipe and cause exhaust gas blockage; set the feeding thickness, and the thickness at the end of feeding is regarded as 100%.

[0041] Step 3: Click the start feeding button, the distributor and drum start to rotate, the controller sets the initial opening of the regulating valve (30%), the camera is started for monitoring, the real-time monitored color value and thickness value information are transmitted to the control loop for comparison with the set value, and the regulating valve opening is controlled in real time based on the PID control algorithm. Keep the color value above 2 for continuous feeding, increase the feeding amount when the color value is above 2.5 to ensure the feeding speed, and reduce the current output and the opening if the color value becomes below 2. Continuous feeding is carried out within this range.

[0042] Step 4: During the feeding process, monitor the real-time RGB value to dynamically determine the material thickness. When the material thickness reaches 100%, the controller outputs 4mA and closes the regulating valve to 0%.

[0043] Step 5: The controller determines that the thickness of the feeding process reaches 100% and the chroma reaches above 2, the regulating valve is closed to 0%, and a signal is output to indicate that the feeding is completed.

[0044] The above description of the disclosed embodiments will enable one skilled in the art to implement or use the present invention. Various modifications to these embodiments will be readily apparent to one skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention is not limited to the embodiments shown herein but is intended to conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A centrifuge feeding device based on image monitoring, characterized in that: It comprises a detection camera (1), a controller module (2) and a regulating valve (3), wherein the detection camera (1) is used to obtain a filter cake colorimetric signal from a centrifuge and send the filter cake colorimetric signal to the controller module (2); The controller module (2) is used to compare the filter cake chromaticity signal with a pre-stored gear signal to determine the size of the feed flow rate; The controller module (2) is used to control the opening of the regulating valve (3) to adjust the feeding flow rate; When the filter cake color signal is smaller than the normal gear, increase the feed flow rate; when the filter cake color signal is larger than the normal gear, reduce the feed flow rate; When the filter cake color signal is at normal level, maintain the feeding amount.

2. The centrifuge feeding device based on image monitoring according to claim 1, characterized in that: The filter cake chromaticity signal is a chromaticity value obtained through RGB values.

3. The centrifuge feeding device based on image monitoring according to claim 1, characterized in that: The chromaticity value is divided into 1, 2, and 3 levels according to the RGB numerical range; the chromaticity value range of the normal gear is 2-2.

5. If the chromaticity value is below 2, the opening is reduced, and if the chromaticity value is above 2.5, the opening is increased.

4. The centrifuge feeding device based on image monitoring according to claim 1, characterized in that: The detection camera (1) captures the image of the filter cake from obliquely above.

5. The centrifuge feeding device based on image monitoring according to claim 1, characterized in that: The initial opening of the regulating valve (3) is 30%.

6. The centrifuge feeding device based on image monitoring according to any one of claims 1 to 5, characterized in that: The detection camera (1) is used to obtain a thickness signal of the filter cake and send the thickness signal to the controller module (2); The controller module (2) determines the filter cake accumulation process according to the thickness signal.

7. The centrifuge feeding device based on image monitoring according to claim 6, characterized in that: The controller module (2) determines that the filter cake thickness reaches 100%, and the opening of the regulating valve (3) is closed to 0%.

8. The centrifuge feeding device based on image monitoring according to claim 7, characterized in that: When the filter cake thickness reaches 100%, the chroma reaches 2 or above, and the regulating valve (3) is closed to 0%, the controller module (2) outputs a signal to indicate that the feeding is complete.

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