Aluminum oxide grinding and grading integrated control system

Abstract

The invention discloses an aluminum oxide grinding and grading integrated control system which is characterized in that a grinding machine is adopted to grind aluminum oxide, the ground aluminum oxide enters a rotatable screening device through a pipeline, the rotatable screening device sends a photoelectric signal to an upper computer, and the upper computer obtains a first particle size range; the rotatable screener rotates to convey the aluminum oxide to the storage unit through a pipeline, a stirrer and a camera are arranged in the storage unit, the camera uploads a shot aluminum oxide image to the upper computer, and the upper computer obtains a second particle size range; and determining a final particle size range according to the first particle size range and the second particle size range, and controlling whether the grinding machine needs to grind again according to the final particle size range, if so, conveying the aluminum oxide to the grinding machine through a pipeline by the storage device to grind again, and if not, conveying the aluminum oxide to a cyclone classifier through a pipeline to classify. By the adoption of the device and method, the particle size of the ground aluminum oxide can be accurately monitored, and follow-up grading is accurate.

Description

Technical Field

[0001] The invention relates to the field of alumina production, and in particular to an alumina grinding and grading integrated control system. Background Art

[0002] Alumina is a high-hardness compound with a melting point of 2054 degrees Celsius and a boiling point of 2980 degrees Celsius. It is an ionized crystal that can be ionized at high temperatures. It is often used as an analytical reagent, dehydration of organic solvents, adsorbent, organic reaction catalyst, abrasive, polishing agent, raw material for smelting aluminum, and refractory material. After alumina is ground, there will be uneven ground particles, some large and some small. Producers often hope that the ground particles will not be too large, so it is very important to monitor the particle size of the ground alumina. The prior art often uses image recognition methods for monitoring the size of alumina particles, but this kind of recognition of the size of alumina particles based solely on the collected images often has a certain gap between the recognition result and the actual result. When the monitoring of the size of alumina particles is not accurate enough, there may also be certain errors in the subsequent classification results. Therefore, the inventors of the present invention propose an integrated control system for alumina grinding and grading to solve the above problems. Summary of the invention

[0003] In order to solve the above problems, the purpose of the present invention is to provide an integrated control system for aluminum oxide grinding and grading, which can more accurately monitor the particle size of aluminum oxide after grinding, and the subsequent grading is also more accurate.

[0004] Based on this, the present invention provides an integrated control system for aluminum oxide grinding and grading, the system comprising:

[0005] A grinder, a storage device connected to the grinder through a pipeline, and a rotatable screener is provided between the grinder and the storage device;

[0006] The grinding machine is used to grind aluminum oxide. The ground aluminum oxide enters the rotatable screen through a pipeline. The rotatable screen sends a photoelectric signal to a host computer. The host computer obtains a first particle size range. The rotatable screen rotates to transport the aluminum oxide to the storage through a pipeline. A stirrer and a camera are provided inside the storage. The camera uploads the captured image of the aluminum oxide to the host computer. The host computer obtains a second particle size range.

[0007] The final particle size range is determined according to the first particle size range and the second particle size range, and the grinding mill is controlled according to the final particle size range to determine whether it needs to be re-grinded. If so, the storage conveys the aluminum oxide to the grinding mill through a pipeline for re-grinding. If not, the aluminum oxide is conveyed to a cyclone classifier through a pipeline for classification.

[0008] Among them, the rotatable screen includes: a rotatable shell, a plurality of screens are arranged in sequence inside the rotatable shell, the apertures of the screens decrease in sequence, the inlet and outlet of the rotatable shell are both provided with valves, the valves are connected to the valve controller, and the valve controller is connected to the first wireless communication module.

[0009] The rotatable housing is fixed to a flip bracket of a rotary positioner, the rotary positioner is connected to a motor, and the motor, driver, motor controller and second wireless communication module are connected in sequence.

[0010] Wherein, the rotatable screen also includes an infrared circuit, and each layer of the screen is correspondingly installed with the infrared circuit. The infrared circuit sends a signal to the host computer, and the host computer determines the first particle size range according to the signal sent by the infrared circuit.

[0011] Among them, the infrared circuit includes: an infrared transmitter and an infrared receiver, the infrared transmitter is connected to the infrared controller, the infrared receiver is connected to the infrared controller through a signal amplifier, the infrared controller is also connected to the third wireless communication module, and the infrared transmitter and the infrared receiver are both installed at a preset position above the screen.

[0012] Among them, the camera captures the alumina image of the agitator in the storage in the stirring state, the alumina image is a preset number, the particle contour is extracted from the alumina image, the particle size of the contour is obtained, the maximum and minimum values ​​of the particle size in each of the alumina images are obtained to form a maximum particle size set and a minimum particle size set, the maximum value in the maximum particle size set is used as the maximum particle size of the alumina, the minimum value in the minimum particle size set is used as the minimum particle size of the alumina, and the second particle size range is from the minimum particle size to the maximum particle size.

[0013] Wherein, obtaining the particle size of the profile includes:

[0014] determining a center of the contour;

[0015] A circle with a continuously increasing radius is made with the center as the center, and a circumscribed rectangle of the circle is obtained. When the circumscribed matrix includes the contour, the radius of the corresponding circle is the particle size of the contour.

[0016] Wherein, determining the center of the contour comprises:

[0017] Obtain the coordinates of two horizontal pixels on the contour that are farthest apart in the horizontal direction;

[0018] Obtaining the two vertical pixel coordinates on the contour that are farthest apart in the vertical direction;

[0019] The intersection of two horizontal pixel coordinates and two vertical pixel coordinates connected respectively is taken as the center.

[0020] Wherein, the cyclone classifier comprises: a preset number of cyclone separation mechanisms, the cyclone separation mechanisms of each stage are connected in sequence, and the cyclone separation mechanism of the last stage is connected to a turbine fan.

[0021] Wherein, the cyclone separation mechanism includes a cyclone separation chamber and a separation fan, wherein the separation fan is arranged at the lower end of the interior of the cyclone separation chamber, the lower end of the cyclone separation chamber is provided with a discharge port, and the upper end is provided with a discharge port.

[0022] In the present invention, first, the grinder grinds aluminum oxide, and the ground aluminum oxide enters the rotatable screen. The aluminum oxide passes through the screen in the rotatable screen, and aluminum oxide particles of different particle sizes stay on different screens. The infrared circuits arranged on each layer of the screen send signals to the host computer. The infrared circuit that does not transmit a signal indicates that the aluminum oxide particles on the screen block the infrared signal, so the infrared receiver of the infrared circuit cannot receive the infrared signal emitted by the infrared transmitter. When the host computer cannot receive the signal sent by the infrared circuit, it indicates that aluminum oxide particles exist in this layer of the screen, that is, aluminum oxide particles with a larger aperture than this layer of the filter but smaller aperture than the previous layer of the filter exist. In this way, the host computer can determine the first particle size range of the aluminum oxide particles, the rotatable screen rotates to transport the aluminum oxide to the storage through a pipeline, the camera uploads the image of the aluminum oxide in a stirring state to the host computer, the host computer obtains the aluminum oxide profile, and obtains the particle size of the aluminum oxide according to the profile, so that the host computer obtains the second particle size range, and the first particle size range and the second particle size range are combined to obtain the final particle size range. If the final particle size range exceeds the preset particle size range, the storage transports the aluminum oxide to the grinder through a pipeline for re-grinding, if not, the aluminum oxide is transported to the cyclone classifier through a pipeline for classification. In the cyclone classifier, the cyclone separation mechanism corresponding to the maximum value in the final particle size range is selected to input aluminum oxide, and the sequential classification of aluminum oxide is started. With the present invention, the particle size of the aluminum oxide after grinding can be monitored more accurately, and the subsequent classification is also more accurate. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. 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 creative work.

[0024] Figure 1 Schematic diagram of an integrated control system for alumina grinding and grading provided by an embodiment of the present invention;

[0025] Figure 2 is an internal schematic diagram of a rotatable filter provided by an embodiment of the present invention;

[0026] Figure 3 is a schematic diagram of an infrared circuit provided by an embodiment of the present invention;

[0027] Figure 4 Schematic diagram of a cyclone classifier provided in an embodiment of the present invention. DETAILED DESCRIPTION

[0028] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0029] Figure 1 Schematic diagram of an integrated control system for alumina grinding and grading provided by an embodiment of the present invention, the system comprising:

[0030] A grinder 101, a storage 103 connected to the grinder 101 by a pipeline, and a rotatable screen 102 is provided between the grinder 101 and the storage 103;

[0031] The grinder 101 is used to grind the aluminum oxide. The ground aluminum oxide enters the rotatable screen 102 through a pipeline. The rotatable screen 102 sends a photoelectric signal to a host computer. The host computer obtains a first particle size range. The rotatable screen rotates to transport the aluminum oxide to the storage 103 through a pipeline. The storage 103 is provided with an agitator and a camera. The camera uploads the captured image of the aluminum oxide to the host computer. The host computer obtains a second particle size range.

[0032] The final particle size range is determined according to the first particle size range and the second particle size range, and the grinding machine 101 is controlled to determine whether it needs to be re-grinded according to the final particle size range. If so, the storage 103 transports the aluminum oxide to the grinding machine 101 through a pipeline for re-grinding. If not, the aluminum oxide is transported to the cyclone classifier through a pipeline for classification.

[0033] The grinding machine 101, the rotatable screen 102 and the inlet and outlet of the storage 103 are all provided with valves. In the present invention, all the valves can be connected to a valve controller, and the valve controller can be connected to the host computer wirelessly or by wire, and the staff can control whether a valve is opened or not through the host computer.

[0034] Figure 2 It is an internal schematic diagram of a rotatable screener provided in an embodiment of the present invention, wherein the rotatable screener comprises: a rotatable shell 204, a plurality of screens 205 sequentially arranged inside the rotatable shell, the apertures of the screens 205 decreasing sequentially, the inlet and outlet of the rotatable shell are both provided with valves 201, the valves 201 are both connected to a valve controller, and the valve controller is connected to a first wireless communication module.

[0035] The rotatable screen also includes an infrared circuit, and each layer of the screen is correspondingly installed with the infrared circuit, and the infrared circuit sends a signal to the host computer, and the host computer determines the first particle size range according to the signal sent by the infrared circuit. The infrared transmitter 202 and the infrared receiver 203 in the infrared circuit are both arranged above the screen, close to the screen. The infrared circuit corresponds to the screen one by one.

[0036] The infrared circuits set on each layer of the screen are used to send signals to the host computer. The infrared circuits that do not send signals indicate that the aluminum oxide particles on the screen block the infrared signals, so the infrared receiver of the infrared circuit cannot receive the infrared signals sent by the infrared transmitter. When the host computer cannot receive the signals sent by the infrared circuit, it indicates that there are aluminum oxide particles on this layer of the screen, that is, there are aluminum oxide particles with a larger aperture than this layer of the filter but smaller than the aperture of the previous layer of the filter. The host computer determines the first particle size range of aluminum oxide by whether it receives signals from the infrared circuits set on each layer of the screen. That is, the maximum and minimum values ​​of the aperture of the screen corresponding to the infrared circuit that sends the signal are the upper and lower limits of the first particle size range. In this way, the host computer can determine the first particle size range of the aluminum oxide particles.

[0037] The rotatable shell is fixed to the flip bracket of the rotary positioner, the rotary positioner is connected to the motor, and the motor, the driver, the motor controller and the second wireless communication module are connected in sequence.

[0038] The rotary positioner is a prior art, which can make the rotatable shell fixed on the flip bracket thereon flip 360 degrees. The control signal sent by the host computer is received by the second wireless communication module and then transmitted to the motor controller. The motor controller drives the driver to control the operation of the motor. The motor drives the rotary positioner to flip 180 degrees, so that the rotatable screen flips 180 degrees. At this time, the aluminum oxide can be affected by gravity and can pass through the screen with a larger aperture than its particle size. At this time, the host computer controls the valve at the bottom of the rotatable screen to open, and the aluminum oxide falls into the storage.

[0039] It should be noted that, after being rotated 180 degrees by the rotary positioner, the inlet and outlet of the rotatable screen can be aligned with the outlet or outlet pipe of the grinding machine and the inlet or inlet pipe of the storage.

[0040] Figure 3 It is a schematic diagram of an infrared circuit provided by an embodiment of the present invention, wherein the infrared circuit comprises: an infrared transmitter 301 and an infrared receiver 302, wherein the infrared transmitter 301 is connected to an infrared controller 304, wherein the infrared receiver 302 is connected to the infrared controller 304 via a signal amplifier 303, wherein the infrared controller 304 is also connected to the third wireless communication module 305, wherein the infrared transmitter 301 and the infrared receiver 302 are both installed at a preset position above the screen.

[0041] The infrared transmitter 301 is used to send infrared signals, the infrared receiver 302 is used to receive infrared signals, the signal amplifier 303 amplifies the received infrared signals and transmits them to the infrared controller 304 , and the infrared controller 304 transmits them to the host computer through the third wireless communication module 305 .

[0042] The stirrer can be arranged in the middle position above the storage, and the stirrer is used to stir the aluminum oxide. The camera can also be installed in the upper position inside the storage, and the camera takes the aluminum oxide image of the stirrer in the storage in the stirring state, and the aluminum oxide image is a preset number of images, and the particle contour of the aluminum oxide image is extracted to obtain the particle size of the contour, and the maximum value and minimum value of the particle size in each of the aluminum oxide images are obtained to form a maximum particle size set and a minimum particle size set, and the maximum value in the maximum particle size set is used as the maximum particle size of the aluminum oxide, and the minimum value in the minimum particle size set is used as the minimum particle size of the aluminum oxide, and the second particle size range is from the minimum particle size to the maximum particle size.

[0043] Wherein, obtaining the particle size of the profile includes:

[0044] determining a center of the contour;

[0045] A circle with a continuously increasing radius is made with the center as the center, and a circumscribed rectangle of the circle is obtained. When the circumscribed matrix includes the contour, the radius of the corresponding circle is the particle size of the contour.

[0046] Wherein, determining the center of the contour comprises:

[0047] Obtain the coordinates of two horizontal pixels on the contour that are farthest apart in the horizontal direction;

[0048] Obtaining the two vertical pixel coordinates on the contour that are farthest apart in the vertical direction;

[0049] The intersection of two horizontal pixel coordinates and two vertical pixel coordinates connected respectively is taken as the center.

[0050] Figure 4 is a schematic diagram of a cyclone classifier provided by an embodiment of the present invention, the cyclone classifier comprises: a preset number of cyclone separation mechanisms, the cyclone separation mechanisms of each stage are connected in sequence, and the cyclone separation mechanism of the last stage is connected to a turbine fan. Figure 4 In the figure, the number of stages of the cyclone separation mechanism is four, which can of course be set independently according to actual conditions and is not limited here.

[0051] The cyclone separation mechanism includes a cyclone separation chamber 402 and a separation fan 405, wherein the separation fan 405 is arranged at the lower end of the cyclone separation chamber 402, wherein the lower end of the cyclone separation chamber is provided with a discharge port, and the upper end is provided with a discharge port. The discharge port is connected to the alumina collector 406 pipeline. The discharge port is connected to the cyclone separation mechanism of the next stage through a conveying pipeline 401, and the cyclone separation mechanism of the last stage is connected to the turbine fan 403. The storage is connected to the alumina receiving pipeline 404 of the cyclone separation mechanism, and a valve is arranged on the alumina receiving pipeline 404. The upper computer only controls the valve on the alumina receiving pipeline 404 of the cyclone separation mechanism corresponding to the maximum value in the final particle size range to open. In other words, the cyclone separation mechanism needs to start receiving the alumina to be classified from the cyclone separation mechanism corresponding to the maximum value in the final particle size range, and not all cyclone separation mechanisms need to be opened.

[0052] The alumina entering the first-stage cyclone separation mechanism is separated by the turbine fan 403, and fine particles meeting the particle size requirements rise with the airflow, and coarse particles carry fine particles and hit the wall, and their speed disappears, and they descend along the inner wall of the cyclone separation chamber 402 to a position of the separation fan 405. Through its strong washing action, the coarse and fine particles are separated, the fine particles rise, and the coarse particles descend to the discharge port for discharge. Alumina particles of different particle sizes are separated, and the finer particles rise to enter the next-stage cyclone separation mechanism, and the coarser particles descend to the discharge port for discharge to the alumina collector 406, thereby realizing the classification of alumina particles of different particle sizes.

[0053] In the present invention, first, the grinder grinds aluminum oxide, and the ground aluminum oxide enters the rotatable screen. The aluminum oxide passes through the screen in the rotatable screen, and aluminum oxide particles of different particle sizes stay on different screens. The infrared circuits arranged on each layer of the screen send signals to the host computer. The infrared circuit that does not transmit a signal indicates that the aluminum oxide particles on the screen block the infrared signal, so the infrared receiver of the infrared circuit cannot receive the infrared signal emitted by the infrared transmitter. When the host computer cannot receive the signal sent by the infrared circuit, it indicates that aluminum oxide particles exist in this layer of the screen, that is, aluminum oxide particles with a larger aperture than this layer of the filter but smaller aperture than the previous layer of the filter exist. In this way, the host computer can determine the first particle size range of the aluminum oxide particles, the rotatable screen rotates to transport the aluminum oxide to the storage through a pipeline, the camera uploads the image of the aluminum oxide in a stirring state to the host computer, the host computer obtains the contour of the aluminum oxide, and obtains the particle size of the aluminum oxide according to the contour. In this way, the host computer obtains the second particle size range, and the first particle size range and the second particle size range are combined to obtain the final particle size range. If the final particle size range exceeds the preset particle size range, the storage transports the aluminum oxide to the grinder through a pipeline for re-grinding. If not, the aluminum oxide is transported to the cyclone classifier through a pipeline for classification. In the cyclone classifier, the cyclone separation mechanism corresponding to the maximum value in the final particle size range is selected to input aluminum oxide, and the sequential classification of aluminum oxide is started. By adopting the present invention, the particle size of the ground aluminum oxide can be monitored more accurately, and the subsequent classification is also more accurate.

[0054] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and substitutions can be made without departing from the technical principles of the present invention. These improvements and substitutions should also be regarded as the scope of protection of the present invention.

Claims

1. An integrated control system for aluminum oxide grinding and grading, characterized in that: include: A grinder, a storage device connected to the grinder through a pipeline, and a rotatable screener is provided between the grinder and the storage device; The grinding machine is used to grind aluminum oxide. The ground aluminum oxide enters the rotatable screen through a pipeline. The rotatable screen sends a photoelectric signal to a host computer. The host computer obtains a first particle size range. The rotatable screen rotates to transport the aluminum oxide to the storage through a pipeline. A stirrer and a camera are provided inside the storage. The camera uploads the captured image of the aluminum oxide to the host computer. The host computer obtains a second particle size range. The final particle size range is determined according to the first particle size range and the second particle size range, and the grinding mill is controlled according to the final particle size range to determine whether it needs to be re-grinded. If so, the storage conveys the aluminum oxide to the grinding mill through a pipeline for re-grinding. If not, the aluminum oxide is conveyed to a cyclone classifier through a pipeline for classification.

2. The integrated control system for aluminum oxide grinding and grading according to claim 1, characterized in that: The rotatable screener includes: a rotatable shell, a plurality of screens are sequentially arranged inside the rotatable shell, the apertures of the screens decrease sequentially, the inlet and outlet of the rotatable shell are both provided with valves, the valves are connected to the valve controller, and the valve controller is connected to the first wireless communication module.

3. The integrated control system for aluminum oxide grinding and grading according to claim 2, characterized in that: The rotatable shell is fixed to the flip bracket of the rotary positioner, the rotary positioner is connected to the motor, and the motor, the driver, the motor controller and the second wireless communication module are connected in sequence.

4. The integrated control system for aluminum oxide grinding and grading according to claim 2, characterized in that: The rotatable screen also includes an infrared circuit, and each layer of the screen is correspondingly equipped with the infrared circuit. The infrared circuit sends a signal to the host computer, and the host computer determines the first particle size range according to the signal sent by the infrared circuit.

5. The integrated control system for aluminum oxide grinding and grading according to claim 4, characterized in that: The infrared circuit includes: an infrared transmitter and an infrared receiver, the infrared transmitter is connected to the infrared controller, the infrared receiver is connected to the infrared controller through a signal amplifier, the infrared controller is also connected to the third wireless communication module, and the infrared transmitter and the infrared receiver are both installed at a preset position above the screen.

6. The integrated control system for aluminum oxide grinding and grading according to claim 1, characterized in that: The camera captures an image of the alumina in the storage device when the agitator is in a stirring state, the alumina images being a preset number, and performs particle contour extraction on the alumina images to obtain the particle size of the contour. The maximum and minimum values ​​of the particle size in each of the alumina images are obtained to form a maximum particle size set and a minimum particle size set, the maximum value in the maximum particle size set is used as the maximum particle size of the alumina, the minimum value in the minimum particle size set is used as the minimum particle size of the alumina, and the second particle size range is from the minimum particle size to the maximum particle size.

7. The integrated control system for aluminum oxide grinding and grading according to claim 6, characterized in that: Obtaining the particle size of the profile includes: determining a center of the contour; A circle with a continuously increasing radius is made with the center as the center, and a circumscribed rectangle of the circle is obtained. When the circumscribed matrix includes the contour, the radius of the corresponding circle is the particle size of the contour.

8. The integrated control system for aluminum oxide grinding and grading according to claim 7, characterized in that: Determining the center of the contour includes: Obtain the coordinates of two horizontal pixels on the contour that are farthest apart in the horizontal direction; Obtaining the two vertical pixel coordinates on the contour that are farthest apart in the vertical direction; The intersection of two horizontal pixel coordinates and two vertical pixel coordinates connected respectively is taken as the center.

9. The integrated control system for aluminum oxide grinding and grading according to claim 1, characterized in that: The cyclone classifier comprises: a preset number of cyclone separation mechanisms, the cyclone separation mechanisms of each stage are connected in sequence, and the cyclone separation mechanism of the last stage is connected to a turbine fan.

10. The integrated control system for aluminum oxide grinding and grading according to claim 9, characterized in that: The cyclone separation mechanism comprises a cyclone separation chamber and a separation fan. The separation fan is arranged at the lower end of the cyclone separation chamber. The lower end of the cyclone separation chamber is provided with a discharge port, and the upper end is provided with a discharge port.

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