Automatic grader equipment

Abstract

The embodiment of the invention relates to automatic grader equipment which comprises a vacuum feeding device, a charging device, an airflow grader, a cyclone separator, a dust removal collecting bin, an induced draft fan and an electric control cabinet. Wherein the vacuum feeding device comprises a feeding negative pressure fan, a feeding bin, a first air seal machine and a buffer bin; the feeding device comprises a second air seal machine and a solid powder flow meter; the airflow classifier comprises an airflow classifier bin body, a classification wheel, a motor for driving the classification wheel to rotate, a third air seal machine and a first online particle size detector; the cyclone separator comprises a cyclone material tank and a second online particle size detector; the dust removal collection bin comprises a dust removal material tank, a filter drum, a dust removal cloth bag and a third online particle size detector; an air inlet of the induced draft fan is connected with an air outlet of the dust removal material tank; the electric control cabinet comprises a PLC control system. According to the automatic grader equipment provided by the embodiment of the invention, the particle size of discharged powder grading can be very stable.

Description

Technical Field

[0001] The present invention relates to the technical field of powder material classification, and particularly to an automatic classifier device. Background Art

[0002] With more and more powder industries having higher and higher requirements for the powders used, the stability of powder classification has become particularly important. However, the development of powder classification equipment and technology has currently reached a bottleneck. Conventional powder classification equipment and technology use the method of manually adjusting equipment parameters to interfere with and affect the particle size of the powder classification finished product. This method requires operators to take samples at the required discharge ports at regular intervals to test the particle size, and then adjust the parameters according to the measured particle size and the experience of debugging parameters. However, for powders, which are materials that change rapidly, the reaction time of this conventional method is too long, and it is difficult to ensure the stability of the particle size of the products obtained by powder classification.

[0003] Taking the classification of current battery powder materials and pharmaceutical powder materials as examples, with the development of battery products and pharmaceutical products, the requirements for the stability of the required powder materials are getting higher and higher. This requires classification equipment and technology that can meet shorter reaction times to produce the required powder materials in order to support more stable backend products.

[0004] At present, powder classification equipment mainly has the following disadvantages. Disadvantage 1: The adjustment of equipment parameters is manually operated. Disadvantage 2: Testing requires taking samples to the laboratory for testing, and the time to obtain the results is relatively long. Disadvantage 3: The above two disadvantages will lead to poor stability of powder classification products; it may be difficult to meet the requirements for some backend products with higher requirements.

[0005] How to overcome the above defects and make the classifier device meet the powder classification process has become an urgent problem for those skilled in the art. Summary of the Invention

[0006] The object of the present invention is to address the deficiencies of the prior art and provide an automatic classifier device, which can achieve timely testing of the particle size results of powder classification and promptly feedback the signal to the PLC control program. The PLC control program will automatically calculate the equipment parameters based on other collected and input signals and the selected function programming, obtain a set of parameters that meet the powder classification particle size, and output the signal to each frequency conversion device. After receiving the signal, the frequency conversion device immediately executes the command, thereby making the particle size of powder classification very stable and largely solving the disadvantages of traditional classification equipment.

[0007] In view of this, an embodiment of the present invention provides an automatic classifier device, which includes a vacuum feeding device, a feeding device, an air classifier, a cyclone separator, a dust collection bin, an induced draft fan, and an electric control cabinet; wherein,

[0008] The vacuum feeding device includes a feeding negative pressure fan, a feeding bin, a first air lock, and a buffer bin; wherein, the feeding negative pressure fan is electrically connected to the feeding bin and is used for feeding the feeding bin; the first air lock is arranged between the discharge port of the feeding bin and the feed port of the buffer bin;

[0009] The feeding device includes a second air lock and a solid powder flow meter; wherein, the second air lock is connected to the discharge port of the buffer bin, and the solid powder flow meter is located in the pipeline connected to the lower part of the second air lock to detect the flow rate of the solid powder in the pipeline;

[0010] The air classifier includes an air classifier bin body, a classification wheel, a motor driving the classification wheel to rotate, a third air lock, and a first on-line particle size detector; wherein, the feed port of the air classifier bin body is connected to the feeding device, and the air classifier bin body is also provided with a coarse powder discharge port, a fine powder outlet, and a plurality of air inlets; the classification wheel is arranged in the air classifier bin body and is driven by the motor driving the classification wheel to rotate; the third air lock is connected to the coarse powder discharge port; the first on-line particle size detector detects the particle size of the discharge at the coarse powder discharge port;

[0011] The cyclone separator includes a cyclone tank and a second on-line particle size detector; the feed port of the cyclone tank is connected to the fine powder outlet of the air classifier bin body, the bottom of the cyclone tank is provided with a discharge port, and the top is provided with an ash discharge port; the second on-line particle size detector detects the particle size of the discharge at the discharge port of the cyclone tank;

[0012] The dust removal and collection bin includes a dust removal tank, filter cartridges, dust removal cloth bags, and a third on-line particle size detector; wherein, the filter cartridges are uniformly arranged in the dust removal tank; the dust removal cloth bags are fitted and installed in the filter cartridges; the dust removal tank is provided with a discharge port and an air discharge port, and the third on-line particle size detector detects the particle size of the discharge at the discharge port of the dust removal tank;

[0013] The air inlet of the induced draft fan is connected to the air discharge port of the dust removal tank;

[0014] The electric control cabinet includes a PLC control system, which collects data on the first air lock, the second air lock, the solid powder flow meter, the plurality of air inlets of the air classifier bin body, the motor driving the classification wheel to rotate, the second on-line particle size detector, the third on-line particle size detector, and the induced draft fan to obtain input signals, and generates a set of output signals according to the set target discharge particle size and the input signals, and respectively sends them to the first air lock, the second air lock, the solid powder flow meter, the plurality of air inlets of the air classifier bin body, the motor driving the classification wheel to rotate, the second on-line particle size detector, the third on-line particle size detector, and the induced draft fan for execution.

[0015] Preferably, the feeding bin is arranged above the buffer bin; wherein,

[0016] A filter element is provided in the feeding bin, and a first pulse air valve is provided above to pulse the filter element.

[0017] A weighing module is provided in the buffer bin, and the signal of the weighing module is automatically fed back to the PLC control system. The PLC control system sets the upper and lower limits of the powder weight in the buffer bin and automatically feeds and stops feeding according to the weight fed back by the weighing module.

[0018] Preferably, the air classifier housing includes an upper housing and a lower housing; wherein,

[0019] The upper housing is provided with a feed inlet and the fine powder outlet, and the classification wheel is installed; the fine powder outlet is connected to the feed inlet of the cyclone separator by a pipeline;

[0020] The lower housing includes a first volute guide structure, a conical cylinder, a coarse powder outlet, a primary air inlet, a secondary air inlet, and a tertiary air inlet;

[0021] Among them, the primary air inlet and the secondary air inlet are arranged on the conical cylinder; valves are installed at the primary air inlet and the secondary air inlet, and the valves are equipped with electric control devices, and the valve opening can be controlled by the PLC control system; the valve opening range of the primary air inlet and the secondary air inlet is between 0-90°;

[0022] The tertiary air inlet is arranged on the first volute guide structure, and an electrically controllable valve is installed at the tertiary air inlet, and the valve opening can be controlled by the PLC control system, and its opening range is between 0-90°;

[0023] The coarse powder outlet is installed at the bottom of the lower housing and is connected to the third air lock by a flange, and the flange below the third air lock is connected to the discharge pipeline;

[0024] The first on-line particle size detector is installed at the position of the coarse powder discharge pipeline to on-line detect the particle size of the powder at the coarse powder outlet and feed back the signal to the PLC control system.

[0025] Preferably, the cyclone tank includes a second volute guide structure and a cyclone tank body, and the second volute guide structure is arranged above the cyclone tank body; the discharge outlet of the cyclone tank body is installed at the bottom of the cyclone tank and is connected to the fourth air lock by a flange, and the flange below the fourth air lock is connected to the discharge pipeline;

[0026] The second on-line particle size detector is installed at the position of the discharge pipeline to on-line detect the particle size of the powder at the cyclone discharge outlet and feed back the signal to the PLC control system;

[0027] The ash discharge port is connected to the feed inlet of the dust removal tank by a pipeline.

[0028] Preferably, the dust collection bin further includes a second pulse air valve and a pulse pipeline, which are arranged on the top of the dust removal bin and intermittently pulse the dust removal filter bags.

[0029] The discharge port of the dust removal bin is installed at the bottom of the dust removal bin and is flange-connected to the fifth air lock, and the flange below the fifth air lock is connected to the discharge pipeline.

[0030] The third on-line particle size detector is installed at the position of the dust removal bin discharge pipeline, and can on-line detect the particle size of the powder at the cyclone discharge port and feed the signal back to the PLC control system.

[0031] The exhaust port and the inlet of the induced draft fan are connected by a pipeline.

[0032] Preferably, the induced draft fan includes a fan impeller, a volute, and a damper.

[0033] The fan impeller is inside the volute.

[0034] The damper behind the inlet of the induced draft fan is installed with an electric control device, and the opening degree can be controlled by the PLC control system; the opening degree range of the damper is between 0-90°.

[0035] Preferably, the electric control cabinet further includes a touch control screen and a plurality of frequency converters.

[0036] The touch control screen includes an operation page and an alarm page.

[0037] The electric control devices of the second air lock of the feeding device, the primary air inlet valve of the air classifier, the secondary air inlet valve of the air classifier, the tertiary air inlet valve of the air classifier, the motor driving the classification wheel, the electric control device of the inlet valve of the induced draft fan, and the motor driving the fan blades of the induced draft fan are all equipped with independent frequency converters that can control their frequency conversion.

[0038] More preferably, the PLC control system is used for signal acquisition, functional programming and application, signal output, signal reception and execution.

[0039] The signal acquisition includes the signals collected by the frequency converter of the second air lock for feeding and input into the PLC control program, the signals collected by the solid powder flowmeter and input into the PLC control program, the signals collected by the frequency converters controlling the opening degrees of multiple air supply openings and input into the PLC control system, the signals collected by the frequency converter of the motor driving the classification wheel and input into the PLC control program, the signals collected by the first on-line particle size detector installed at the position of the coarse powder discharge pipeline and input into the PLC control program, the signals collected by the second on-line particle size detector installed at the position of the cyclone discharge pipeline and input into the PLC control program, the signals collected by the third on-line particle size detector installed at the position of the dust discharge pipeline and input into the PLC control program, the signals collected by the frequency converter controlling the opening degree of the control valve behind the inlet of the induced draft fan and input into the PLC control program, and the signals collected by the frequency converter of the motor driving the fan blades of the induced draft fan and input into the PLC control program;

[0040] The functional programming includes programming the corresponding functions for the equipment parameters required according to the products with different particle size requirements needed for different powders.

[0041] The application of the functional programming includes setting the target discharge particle size. The control system automatically calculates the equipment parameters according to the signals collected and input by the particle size detector and other collected and input signals, in accordance with the function programming selected by the PLC control program, to obtain a set of equipment parameters that meet the requirements of the target value product.

[0042] The signal output includes the PLC control program outputting the equipment parameters that meet the requirements of the target discharge particle size product calculated according to the function programming to each frequency converter.

[0043] The signal reception and execution include that each frequency converter immediately executes after receiving the signal sent by the PLC control program.

[0044] An automatic classifier equipment provided by an embodiment of the present invention can realize timely testing of the particle size results of powder classification and timely feedback of the signals to the PLC control program. The PLC control program will automatically calculate the equipment parameters according to other collected and input signals and the selected function programming, obtain a set of parameters that meet the powder classification particle size, and output the signals to each frequency conversion device. After receiving the signals, the frequency conversion device immediately executes the command, thereby making the particle size of powder classification very stable and largely solving the drawbacks of traditional classification equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0045] Figure 1 It is a schematic structural diagram of an automatic classifier equipment provided by an embodiment of the present invention. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0046] The technical solution of the present invention will be further described in detail below with reference to the accompanying drawings and embodiments.

[0047] Figure 1 The following is a schematic structural diagram of an automated classifier device provided by an embodiment of the present invention. As Figure 1 shown, an automated classifier device provided by an embodiment of the present invention includes a vacuum feeding device 1, a feeding device 2, an air classifier 3, a cyclone separator 4, a dust collection bin 5, an induced draft fan 6, and an electric control cabinet. The structure and function of the automated classifier device will be specifically introduced below in combination with Figure 1 This is a specific introduction to the structure and function of the automated classifier device.

[0048] The vacuum feeding device 1 is used for feeding, and specifically includes a feeding negative pressure fan 11, a feeding bin 12, a first air lock 13, and a buffer bin 14. Under the action of the feeding negative pressure fan 11, the material enters the feeding bin 12 and then enters the buffer bin 14. Among them, the feeding negative pressure fan 11 is electrically connected to the feeding bin 12 for feeding the feeding bin 12; the first air lock 13 is a fixed-frequency planetary air lock, which is arranged between the discharge port of the feeding bin 12 and the feed port of the buffer bin 14. In a preferred solution, the feeding bin 12 is arranged above the buffer bin 14, and the discharge port of the feeding bin 12 and the feed port of the buffer bin 14 are connected by a flange and a sealing ring of the first air lock 13; among them, a filter element 121 is provided in the feeding bin 12, and a first pulse air valve 122 is provided above it to pulse the filter element 121; a weighing module is provided in the buffer bin 14, and the signal of the weighing module is automatically fed back to the PLC control system. The PLC control system sets the upper and lower limits of the powder weight in the buffer bin 14 and automatically feeds and stops feeding according to the weight fed back by the weighing module. It should be noted that those skilled in the art can select the vacuum feeding device 1 according to needs. In this embodiment, the rated power of the feeding negative pressure fan 11 is 5.5KW, and the rated frequency is 50Hz; the diameter model of the feeding bin 12 is 500mm, the maximum operating pressure of the pulse air valve is 1MPa, the filter element 121 is DN133mm, the model of the first air lock 13 is DN150, and the volume of the second buffer bin 14 is 1.5m 3 .

[0049] The feeding device 2 is used for feeding, and specifically includes a second air lock 21 and a solid powder flowmeter 22. Among them, the second air lock 21 is a variable-frequency planetary air lock, which is connected to the discharge port of the buffer bin 14. The solid powder flowmeter 22 is located in the pipeline connected to the lower part of the second air lock 21 to detect the flow rate of the solid powder in the pipeline. It should be noted that those skilled in the art can select the type of the feeding device 2 according to needs. In this embodiment, the model of the second air lock 21 is a variable-frequency planetary air lock with DN150, and the nominal diameter of the solid powder flowmeter 22 is DN25 - DN300, and the measuring range is 0 - 1000 kg / hour.

[0050] The air classifier 3 is used for classifying materials. The air classifier 3 specifically includes an air classifier housing 31, a classification wheel 32, a motor 33 for driving the classification wheel to rotate, a third air lock 34, and a first on-line particle size detector 35.

[0051] Among them, the feed inlet of the air classifier housing 31 is connected to the feeding device 2. The air classifier housing 31 is also provided with a coarse powder discharge port 313, a fine powder outlet 312, and a plurality of air inlets. The classification wheel 32 is arranged in the air classifier housing 31 and is driven by the motor 33 that drives the classification wheel 32 to rotate. Here, the cross-sectional area of the classification wheel 32 is preferably 300 mm, the rated power of the motor 33 that drives the classification wheel 32 to rotate is preferably 11 KW, and the basic frequency is preferably 50 Hz. The third air lock 34 is connected to the coarse powder discharge port 313. The first on-line particle size detector 35 detects the particle size of the discharge from the coarse powder discharge port 313.

[0052] In a specific example, the air classifier housing 31 includes an upper housing and a lower housing; among them, the upper housing is provided with a feed inlet and a fine powder outlet 312, and a classifier wheel 32 is installed; the fine powder outlet 312 is connected to the feed inlet of the cyclone separator 4 by a pipeline; the lower housing includes a first volute guide structure 311, a conical cylinder, a coarse powder discharge port 313, a primary air inlet 314, a secondary air inlet 315, and a tertiary air inlet 316; here, the primary air inlet 314 and the secondary air inlet 315 are arranged on the conical cylinder, and the diameter is preferably 100 mm; valves are installed at the primary air inlet 314 and the secondary air inlet 315, and the valves are equipped with an electric control device, and the valve opening can be controlled by the PLC control system; the valve opening range of the primary air inlet 314 and the secondary air inlet 315 is between 0-90°; the tertiary air inlet 316 is arranged on the first volute guide structure 311, and the diameter is preferably 150 mm. An electrically controllable valve is installed at the tertiary air inlet 316, and the valve opening can be controlled by the PLC control system, and its opening range is between 0-90°; the coarse powder discharge port 313 is installed at the bottom of the lower housing and is connected to the third air lock 34 by a flange. The third air lock 34 is connected to the discharge pipeline by a flange below. Here, the third air lock 34 is preferably a fixed-frequency planetary air lock, and the model is DN150. The first on-line particle size detector 35 is installed at the position of the coarse powder discharge pipeline to on-line detect the particle size of the powder at the coarse powder discharge port 313 and feed the signal back to the PLC control system. It should be noted that the first on-line particle size detector 35 is connected to the computer in the control room, the particle size detection system and the control unit by an optical cable, has strong anti-interference ability, and realizes long-distance data transmission and control. The embedded simulation control program module and interface make all valve and air flow states clear at a glance. The complete particle size distribution data five times per second can be real-time transmitted to the user's PLC system through an interface that meets the standard industrial communication control protocol. Any deviation of the particle size index at any time can trigger the automatic adjustment and control of the production equipment to ensure that the product particle size continuously meets the index requirements set by the user; the on-line particle size detector is installed at the position of the coarse powder discharge pipeline, and can on-line detect the particle size of the powder at the coarse powder discharge port 313 and feed the signal back to the control program in the electric control cabinet. The fine powder outlet 312 is connected to the feed inlet of the cyclone separator 4 by a pipeline.

[0053] The cyclone separator 4 specifically includes a cyclone tank 41 and a second on-line particle size detector 42; the feed inlet of the cyclone tank 41 is connected to the fine powder outlet 312 of the air classifier housing 31. The bottom of the cyclone tank 41 is provided with a discharge port, and the top is provided with an ash discharge port; the second on-line particle size detector 42 detects the particle size of the discharge at the discharge port of the cyclone tank 41.

[0054] In a specific example, the cyclone storage tank 41 specifically includes a second volute guide structure 411 and a cyclone tank body. The second volute guide structure 411 is arranged above the cyclone tank body. The discharge port of the cyclone tank body is installed at the bottom of the cyclone storage tank 41 and is flange-connected to the fourth air-lock valve 43 by a flange. The fourth air-lock valve 43 is flange-connected to the discharge pipeline below. The second on-line particle size detector 42 is installed at the position of the discharge pipeline and can on-line detect the particle size of the powder at the cyclone discharge port and feed the signal back to the PLC control system. The ash discharge port is connected to the feed port of the dust removal storage tank 51 by a pipeline.

[0055] The dust removal collection bin 5 for dust removal specifically includes a dust removal storage tank 51, filter cartridges 52, dust removal filter bags, and a third on-line particle size detector 53. Among them, the filter cartridges 52 are uniformly arranged in the dust removal storage tank 51. The dust removal filter bags are fitted and installed in the filter cartridges 52, with a preferred model of DN133mm and a preferred length of 1500mm. The dust removal storage tank 51 is provided with a discharge port and an air discharge port. The third on-line particle size detector 53 detects the particle size of the discharge at the discharge port of the dust removal storage tank 51.

[0056] In a specific example, the dust removal collection bin 5 further includes a second pulse air valve and a pulse pipeline, which are arranged at the top of the dust removal storage tank 51 and intermittently pulse the dust removal filter bags. The maximum operating pressure of the pulse air valve is 1MPa. The discharge port of the dust removal storage tank 51 is installed at the bottom of the dust removal storage tank 51 and is flange-connected to the fifth air-lock valve 54 by a flange. The fifth air-lock valve 54 is flange-connected to the discharge pipeline below. The third on-line particle size detector 53 is installed at the position of the discharge pipeline of the dust removal bin and can on-line detect the particle size of the powder at the cyclone discharge port and feed the signal back to the PLC control system. The air discharge port is connected to the air inlet of the induced draft fan 6 by a pipeline.

[0057] The induced draft fan 6 has its air inlet connected to the air discharge port of the dust removal storage tank 51. Specifically, the induced draft fan 6 includes a fan impeller 61, a volute, and a wind valve. The fan impeller is inside the volute, and the motor 62 that drives the fan blades to rotate has a rated power of 45KW and a frequency of 50Hz. An electric control device is installed on the wind valve behind the air inlet of the induced draft fan 6, and its opening degree can be controlled by the PLC control system. The opening degree range of the wind valve is between 0 - 90°.

[0058] The electric control cabinet specifically includes a PLC control system, which collects data from the first air shutter 13, the second air shutter 21, the solid powder flowmeter 22, multiple air inlets of the air classifier housing 31, the motor 33 that drives the classifier wheel 32 to rotate, the second on-line particle size detector 42, the third on-line particle size detector 53, and the induced draft fan 6 to obtain input signals, and generates a set of output signals according to the set target discharge particle size and the input signals, and sends them to the first air shutter 13, the second air shutter 21, the solid powder flowmeter 22, multiple air inlets of the air classifier housing 31, the motor 33 that drives the classifier wheel 32 to rotate, the second on-line particle size detector 42, the third on-line particle size detector 53, and the induced draft fan 6 for execution.

[0059] In a specific example, the electric control cabinet further includes a touch control screen and multiple frequency converters. The touch control screen is used for display, for users to view and operate. The touch control screen includes an operation page and an alarm page; the electric control devices of the second air shutter 21 of the feeding device 2, the primary air inlet 314 valve of the air classifier 3, the secondary air inlet 315 valve, the tertiary air inlet 316 valve, the motor 33 that drives the classifier wheel 32 to rotate, the electric control device of the air inlet valve of the induced draft fan 6, and the motor 62 that drives the fan impeller blades of the induced draft fan 6 all have independent frequency converters that can control their frequency conversion.

[0060] Furthermore, the PLC control system is specifically used for signal acquisition, functional programming and application, signal output, signal reception and execution. The following is a specific introduction to the PLC control system.

[0061] Signal acquisition specifically includes: the signals collected by the frequency converter of the second air shutter 21 of the feeding and input into the PLC control program, the signals collected by the solid powder flowmeter 22 and input into the PLC control program, the signals collected by the frequency converters that control the opening degrees of multiple air supply openings and input into the PLC control system, the signals collected by the frequency converter of the motor 33 that drives the classifier wheel 32 to rotate and input into the PLC control program, the signals collected by the first on-line particle size detector 35 installed at the position of the coarse powder discharge pipeline and input into the PLC control program, the signals collected by the second on-line particle size detector 42 installed at the position of the cyclone discharge pipeline and input into the PLC control program, the signals collected by the third on-line particle size detector 53 installed at the position of the dust removal material discharge pipeline and input into the PLC control program, the signals collected by the frequency converter that controls the opening degree of the control valve behind the air inlet of the induced draft fan 6 and input into the PLC control program, and the signals collected by the frequency converter of the motor 62 that drives the fan blades of the induced draft fan 6 and input into the PLC control program.

[0062] Functional programming specifically includes: according to the products with different particle size requirements required for different powders, programming the required equipment parameters into corresponding functions.

[0063] The specific applications of functional programming include: setting the target discharge particle size. The control system calculates the equipment parameters automatically according to the signals collected and input by the particle size detector and other collected and input signals, in accordance with the function programming selected by the PLC control program, to obtain a set of equipment parameters that meet the requirements of the target value product.

[0064] The signal output specifically includes: the PLC control program outputs the equipment parameters that meet the requirements of the target discharge particle size product calculated according to the function programming to each frequency converter.

[0065] The signal reception and execution specifically include: after each frequency converter receives the signal sent by the PLC control program, it immediately executes.

[0066] On the basis of understanding the structure and principle of the automatic classifier equipment provided in this embodiment, the following takes the classification of graphite anode powder materials, porous carbon powder materials, and pharmaceutical powder materials as examples to further introduce the actual application effects of this classifier equipment.

[0067] Example 1

[0068] In this example, graphite anode powder material is selected as the raw material, and the powder obtained from the coarse powder discharge port is used as the finished product, and function programming 1 is used.

[0069] Before starting the machine, a collection device needs to be connected to the outlets of the coarse powder discharge pipeline, the cyclone discharge pipeline, and the fine powder discharge pipeline. In this example, a ton bag with an inner PE film is used.

[0070] Set the target value of the particle size of the coarse powder discharge to Dv50 = 22μm, the feeding frequency of the feeding planetary air lock is 10Hz, the solid powder flowmeter shows a powder flow rate of 200kg / h, the opening degree of the primary air inlet is 45 degrees, the opening degree of the secondary air inlet is 45 degrees, the opening degree of the tertiary air inlet is 45 degrees, the frequency of the motor driving the classifier wheel rotation is 20Hz, the opening degree of the valve installed at the air inlet of the induced draft fan is 45 degrees, and the frequency of the motor driving the fan blade rotation is 30Hz.

[0071] The powder is sucked by the feeding negative pressure fan into the first feeding bin, then enters the buffer bin through the first air lock, and enters the air classification bin after passing through the second air lock and the pipeline. The negative pressure provided by the induced draft fan provides the power. The rotation of the classifier wheel restricts a part of the powder with coarser particles from passing through, and this part of the coarser powder will fall to the coarse powder discharge port under the action of gravity, and come out through the air lock and the coarse powder discharge pipeline and enter the PE bag; the remaining powder not restricted by the rotating classifier wheel enters the cyclone separator tangentially through the fine powder outlet of the air classifier. Part of the powder comes down from the cyclone discharge pipeline and enters the PE bag; and a part of the finer powder enters the dust removal bin through the ash discharge port of the cyclone separator through the pipeline, and then falls to the dust removal discharge port and enters the PE bag.

[0072] Function 1:

[0073] Dv50 = 35.817 - 0.025 * solid powder flow rate - 0.805 * classification frequency + 0.095 * fan frequency Feed frequency = solid powder flow rate / 20

[0074] The following shows the process of the PLC control program system automatically adjusting parameters according to Function Programming 1 and the resulting coarse powder discharge particle size.

[0075]

[0076]

[0077] Example 2

[0078] In this example, a porous carbon powder material is used as the raw material. The raw material has a relatively fine particle size. The powder obtained from the cyclone discharge port is used as the finished product, and Function Programming 2 is used.

[0079] Before starting up, a collection device needs to be connected to the outlets of the coarse powder discharge pipe, the cyclone discharge pipe, and the fine powder discharge pipe. In this example, a ton bag with an inner PE film is used.

[0080] Set the target value of the particle size of the cyclone discharge to Dv50 = 9 μm, the feeding frequency of the feeding planetary air lock to 5 Hz, the powder flow rate shown by the solid powder flow meter to 60 kg / h, the opening degree of the primary air inlet to 45 degrees, the opening degree of the secondary air inlet to 45 degrees, the opening degree of the tertiary air inlet to 45 degrees, the frequency of the motor driving the classifier wheel to 40 Hz, the opening degree of the valve installed at the inlet of the induced draft fan to 45 degrees, and the frequency of the motor driving the fan blades to 40 Hz.

[0081] The powder is sucked by the feeding negative pressure fan into the first feeding bin, then enters the buffer bin through the first air lock, and enters the air classification bin through the second air lock and the pipeline. The negative pressure provided by the induced draft fan provides the power. The rotation of the classifier wheel restricts very few particles of relatively coarse powder from passing through (it is mentioned at the beginning of this embodiment that the raw material has a relatively fine particle size). And this part of the relatively coarse powder will fall to the coarse powder discharge port under the action of gravity, and come out through the air lock and the coarse powder discharge pipe and enter the PE bag; the remaining powder not restricted by the rotating classifier wheel enters the volute guide structure tangentially through the fine powder outlet of the air classifier and the inlet of the cyclone. Under the action of the centrifugal force exerted by the air flow on the powder and the gravity of the powder itself, classification is carried out. The powder with gravity greater than centrifugal force will fall to the cyclone discharge port in a spiral trajectory, come out through the air lock and the cyclone discharge pipe, and enter the PE bag; the remaining material enters the dust removal bin through the ash discharge port of the cyclone separator through the pipeline, and then falls to the dust removal discharge port and enters the PE bag.

[0082] Function 2:

[0083] Dv50 = 10.33 - 0.019 * solid powder flow rate - 0.068 * classification frequency + 0.068 * fan frequency

[0084] Feeding frequency = solid powder flow rate / 12

[0085] The following shows the process of the PLC control program system automatically adjusting parameters according to Function Programming 2 and the resulting cyclone discharge particle size.

[0086] Feeding frequency Classification frequency Fan frequency Dv50 5.246 43.767 40.015 8.868 4.277 42.827 38.031 9.020 5.157 45.227 42.396 8.951 4.501 43.589 41.590 9.159 4.887 46.791 41.102 8.819 4.410 45.973 41.246 8.994 4.615 40.335 34.660 8.883 3.955 42.433 38.107 9.126 5.175 46.464 45.977 9.107

[0087] Example 3

[0088] In this example, a pharmaceutical powder material is used as the raw material. The particle size of this raw material is relatively fine, but since the required particle size of the pharmaceutical powder product needs to be even smaller, the powder obtained from the dust removal discharge port is used as the finished product, and Function Programming 3 is used.

[0089] Before starting the machine, a collection device needs to be connected to the outlets of the coarse powder discharge pipeline, the cyclone discharge pipeline, and the fine powder discharge pipeline. In this example, a ton bag with an inner PE film is used.

[0090] Set the target value of the cyclone discharge particle size as Dv50 = 3 - 4 μm, the feeding frequency of the feeding planetary air lock as 5 Hz, the powder flow rate shown by the solid powder flow meter as 40 kg / h, the opening degree of the primary air inlet as 45 degrees, the opening degree of the secondary air inlet as 45 degrees, the opening degree of the tertiary air inlet as 45 degrees, the frequency of the motor driving the classifier wheel as 40 Hz, the opening degree of the valve installed at the inlet of the induced draft fan as 45 degrees, and the frequency of the motor driving the fan blades as 40 Hz.

[0091] The powder is sucked by the feeding negative pressure fan into the first feeding bin, then enters the buffer bin through the first air lock, and enters the air classification bin after passing through the second air lock and the pipeline. The negative pressure provided by the induced draft fan provides the power. The rotation of the classifier wheel restricts very few particles of the coarser powder from passing through (it was mentioned at the beginning of this example that the particle size of the raw material is relatively fine). And this part of the coarser powder will fall to the coarse powder discharge port under the action of gravity, come out through the air lock and the coarse powder discharge pipeline, and enter the PE bag; the remaining powder not restricted by the rotating classifier wheel enters the volute guide structure tangentially through the fine powder outlet of the air classifier and the inlet of the cyclone. Under the action of the centrifugal force exerted by the air flow on the powder and the gravity of the powder itself, classification is carried out. The powder with gravity greater than centrifugal force will fall to the cyclone discharge port in a spiral trajectory, come out through the air lock and the cyclone discharge pipeline, and enter the PE bag. The finer powder enters the dust removal bin through the ash discharge port of the cyclone separator, is filtered by the cloth bag under the action of the pulse air pressure, and then falls to the dust removal discharge port and enters the PE bag.

[0092] Function 3:

[0093] Dv50 = 0.626 - 0.010 * Solid powder flow rate - 0.050 * Classification frequency + 0.040 * Fan frequency

[0094] Feeding frequency = Solid powder flow rate / 8

[0095] The following shows the process of the PLC control program system automatically adjusting parameters according to function programming 3 and the resulting dust removal material discharge particle size output.

[0096] Feeding frequency Classification frequency Fan frequency Dv50 8.153 49.711 40.915 4.109 6.432 47.336 38.786 4.040 8.166 50.671 38.404 4.056 7.341 48.081 37.734 3.964 8.797 53.419 33.315 3.940 7.301 49.152 36.714 3.980 9.378 49.287 38.858 3.910 6.861 49.898 36.996 4.063 7.671 44.326 43.477 3.980 6.246 46.191 39.312 4.019

[0097] In the following comparative example, a PLC control program without functional programming is used. That is, during the powder classification process, parameters need to be manually adjusted to affect the result of the finished product particle size.

[0098] Comparative Example 1

[0099] In this example, graphite anode powder material is selected as the raw material, and the powder obtained from the coarse powder discharge port is used as the finished product, using function programming 1.

[0100] Before starting the machine, a collection device needs to be connected to the outlets of the coarse powder discharge pipeline, cyclone discharge pipeline, and fine powder discharge pipeline. In this example, a ton bag with an inner PE film is used.

[0101] Set the target value of the particle size of the coarse powder discharge to Dv50 = 22μm, the feeding planetary air lock feeding frequency to 10Hz, the opening degree of the primary air inlet to 45 degrees, the opening degree of the secondary air inlet to 45 degrees, the opening degree of the tertiary air inlet to 45 degrees, the frequency of the motor driving the classifier wheel to 20Hz, the opening degree of the valve installed at the air inlet of the induced draft fan to 45 degrees, and the frequency of the motor driving the fan blades to 30Hz.

[0102] The powder is sucked by the feeding negative pressure fan into the first feeding bin, then enters the buffer bin through the first air lock, and enters the air classification bin after passing through the second air lock and pipeline. The negative pressure provided by the induced draft fan provides the power. The rotation of the classifier wheel restricts a part of the powder with coarser particles from passing through, and this part of the coarser powder will fall to the coarse powder discharge port under the action of gravity, and come out through the air lock and the coarse powder discharge pipeline and enter the PE bag; the remaining powder not restricted by the rotating classifier wheel enters the cyclone separator tangentially through the fine powder outlet of the air classifier. Part of the powder comes down from the cyclone discharge pipeline and enters the PE bag; another part of the finer powder enters the dust removal tank from the ash discharge port of the cyclone separator through the pipeline, and then falls to the dust removal discharge port and enters the PE bag.

[0103] The following shows the process of manually adjusting the equipment parameters and the resulting coarse powder particle size.

[0104] Feeding frequency Classification frequency Fan frequency Dv50 7.5 19.8 35.5 19.937 7.5 20.4 35.5 18.644 5.8 19.8 36.8 20.483 4.6 19.8 45.7 23.303 4.6 14.6 41.1 24.791 4.6 15.7 41.1 23.083 4.6 15.7 38.0 22.584 5.6 14.0 42.0 23.465 7.2 17.0 42.0 20.555 5.0 20.9 42.0 20.772

[0105] Compared with Example 1, the parameters in this comparative example were artificially adjusted according to the test results. For the particle size Dv50 of the finished product corresponding to the parameters, it can be seen that the fluctuations are relatively large.

[0106] Comparative Example 2

[0107] In this example, a porous carbon powder material was used as the raw material. The particle size of this raw material was relatively fine. The powder obtained from the cyclone discharge port was used as the finished product, and Function Programming 2 was used.

[0108] Before starting the machine, a collection device needs to be connected to the outlets of the coarse powder discharge pipe, the cyclone discharge pipe, and the fine powder discharge pipe. In this example, a ton bag with an inner PE film was used.

[0109] The target value of the particle size of the cyclone discharge was set to Dv50 = 9 μm. The feeding frequency of the feeding planetary air lock was 5 Hz, the opening degree of the primary air inlet was 45 degrees, the opening degree of the secondary air inlet was 45 degrees, the opening degree of the tertiary air inlet was 45 degrees, the frequency of the motor driving the classifier wheel was 40 Hz, the opening degree of the valve installed at the air inlet of the induced draft fan was 45 degrees, and the frequency of the motor driving the fan blades was 40 Hz.

[0110] The powder was sucked by the feeding negative pressure fan into the first feeding bin, then entered the buffer bin through the first air lock, entered the air classification bin after passing through the second air lock and the pipeline. The negative pressure provided by the induced draft fan provided the power. The rotation of the classifier wheel restricted very few particles of the relatively coarse powder from passing through (it was mentioned at the beginning of this example that the particle size of the raw material was relatively fine). And this part of the relatively coarse powder would fall to the coarse powder discharge port under the action of gravity, and come out through the air lock and the coarse powder discharge pipe and enter the PE bag; the remaining powder not restricted by the rotating classifier wheel entered the volute guide structure tangentially through the fine powder outlet of the air classifier and the feed inlet of the cyclone. Under the action of the centrifugal force exerted by the air flow on the powder and the gravity of the powder itself, classification was carried out. The powder with gravity greater than the centrifugal force would fall to the cyclone discharge port in a spiral trajectory, come out through the air lock and the cyclone discharge pipe, and enter the PE bag; the remaining material entered the dust removal bin through the ash discharge port of the cyclone separator through the pipeline, and then fell to the dust removal discharge port and entered the PE bag.

[0111] The following shows the process of artificially adjusting the equipment parameters and the resulting cyclone discharge particle size

[0112]

[0113]

[0114] Compared with Example 2, the parameters in this comparative example were artificially adjusted according to the test results. For the particle size Dv50 of the finished product corresponding to the parameters, it can be seen that the fluctuations are relatively large.

[0115] Comparative Example 3

[0116] In this example, a pharmaceutical powder material is used as the raw material. The particle size of this raw material is relatively fine. However, since the required particle size of the finished product for pharmaceutical powder needs to be smaller, the powder obtained from the dust removal discharge port is used as the finished product, and function programming 3 is used.

[0117] Before starting the machine, a collection device needs to be connected to the outlets of the coarse powder discharge pipe, the cyclone discharge pipe, and the fine powder discharge pipe. In this example, a ton bag with an inner PE film is used.

[0118] The target value of the particle size of the cyclone discharge is set to Dv50 = 3 - 4 μm, the feeding frequency of the feeding planetary air lock is 5 Hz, the solid powder flowmeter shows a powder flow rate of 3 L / min, the opening degree of the primary air inlet is 45 degrees, the opening degree of the secondary air inlet is 45 degrees, the opening degree of the tertiary air inlet is 45 degrees, the frequency of the motor driving the classifier wheel is 40 Hz, the opening degree of the valve installed at the air inlet of the induced draft fan is 45 degrees, and the frequency of the motor driving the fan blades is 40 Hz.

[0119] The powder is sucked by the feeding negative pressure fan into the first feeding bin, then enters the buffer bin through the first air lock, and enters the air classification bin after passing through the second air lock and the pipeline. The negative pressure provided by the induced draft fan provides the power. The rotation of the classifier wheel restricts very few particles of relatively coarse powder from passing through (it was mentioned at the beginning of this embodiment that the particle size of the raw material is relatively fine). And this part of the relatively coarse powder will fall to the coarse powder discharge port under the action of gravity, and come out through the air lock and the coarse powder discharge pipe and enter the PE bag; the powder that is not restricted by the rotating classifier wheel will enter the volute guide structure tangentially through the fine powder outlet of the air classifier and the feed inlet of the cyclone. It is classified under the action of the centrifugal force exerted by the air flow on the powder and the gravity of the powder itself. The powder with gravity greater than the centrifugal force will fall to the cyclone discharge port in a spiral trajectory, come out through the air lock and the cyclone discharge pipe, and enter the PE bag. The finer powder enters the dust removal bin through the ash discharge port of the cyclone separator through the pipeline, and after being filtered by the cloth bag under the action of the pulse air pressure, it falls to the dust removal discharge port and enters the PE bag.

[0120] The following shows the process of manually adjusting the equipment parameters and the resulting particle size of the dust removal discharge.

[0121] Feeding frequency Classification frequency Fan frequency Dv50 9.0 39.8 38.2 3.444 8.0 39.8 38.2 3.321 7.0 39.8 40.0 4.491 7.0 43.0 40.0 3.963 7.0 43.0 40.0 4.523 7.0 48.0 40.0 4.038 7.0 48.0 40.0 4.971 8.0 40.0 35.0 3.874 7.3 40.0 42.0 4.466 7.3 40.0 40.0 4.358

[0122] Compared with Example 3, in this comparative example, the parameters are manually adjusted according to the test results. It can be seen that there is a large fluctuation in the particle size Dv50 of the finished product corresponding to the parameters.

[0123] An automated classifier device provided by an embodiment of the present invention can achieve timely testing of the particle size results of powder classification and timely feedback of this signal to the PLC control program. The PLC control program will automatically calculate the device parameters according to other collected and input signals and the selected function programming, obtain a set of parameters that meet the powder classification particle size, and output this signal to each frequency conversion device. After receiving the signal, the frequency conversion device immediately executes this command, thereby making the particle size of powder classification very stable and largely solving the drawbacks of traditional classification equipment.

[0124] In the present invention, the term "a plurality of" refers to two or more, unless otherwise clearly defined. Terms such as "installation", "connection", "connection", "fixation" and other terms should be understood in a broad sense. For example, "connection" can be a fixed connection, a detachable connection, or an integral connection; "connection" can be a direct connection or an indirect connection through an intermediate medium. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0125] In the description of the present invention, it should be understood that the orientation or positional relationship indicated by terms such as "upper", "lower", "left", "right", "front", "rear", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or unit referred to must have a specific direction, be constructed and operated in a specific orientation, and therefore, should not be construed as a limitation of the present invention.

[0126] In the description of this specification, the description of terms such as "a specific embodiment", "some embodiments", "an embodiment", etc. means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic expressions of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in a suitable manner in any one or more embodiments or examples.

[0127] The above-described specific implementation manners further elaborate on the purpose, technical solution and beneficial effects of the present invention. It should be understood that the above is only the specific implementation manner of the present invention and is not used to limit the protection scope of the present invention. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. An automated classifier device, characterized in that, The automatic classifier equipment includes a vacuum feeding device, a feeding device, an air classifier, a cyclone separator, a dust collection bin, an induced draft fan, and an electric control cabinet; among them, The vacuum feeding device includes a feeding negative pressure fan, a feeding bin, a first air lock, and a buffer bin; among them, the feeding negative pressure fan is electrically connected to the feeding bin for feeding the feeding bin; the first air lock is arranged between the discharge port of the feeding bin and the feed port of the buffer bin; The feeding device includes a second air lock and a solid powder flowmeter; among them, the second air lock is connected to the discharge port of the buffer bin, and the solid powder flowmeter is located in the pipeline connected below the second air lock to detect the flow rate of the solid powder in the pipeline; The air classifier includes an air classifier bin body, a classification wheel, a motor driving the classification wheel to rotate, a third air lock, and a first on-line particle size detector; among them, the feed port of the air classifier bin body is connected to the feeding device, and the air classifier bin body is also provided with a coarse powder discharge port, a fine powder outlet, and a plurality of air inlets; the classification wheel is arranged in the air classifier bin body and is driven by a motor driving the classification wheel to rotate; the third air lock is connected to the coarse powder discharge port; the first on-line particle size detector detects the particle size of the discharge at the coarse powder discharge port; The cyclone separator includes a cyclone tank and a second on-line particle size detector; the feed port of the cyclone tank is connected to the fine powder outlet of the air classifier bin body, the bottom of the cyclone tank is provided with a discharge port, and the top is provided with a dust discharge port; the second on-line particle size detector detects the particle size of the discharge at the discharge port of the cyclone tank; The dust collection bin includes a dust collection tank, filter cartridges, dust removal filter bags, and a third on-line particle size detector; among them, the filter cartridges are uniformly arranged in the dust collection tank; the dust removal filter bags are fitted and installed in the filter cartridges; the dust collection tank is provided with a discharge port and an exhaust port, and the third on-line particle size detector detects the particle size of the discharge at the discharge port of the dust collection tank; The air inlet of the induced draft fan is connected to the exhaust port of the dust collection tank; The electric control cabinet includes a PLC control system, which collects data on the first air lock, the second air lock, the solid powder flowmeter, the multiple air inlets of the air classifier bin body, the motor driving the classification wheel to rotate, the second on-line particle size detector, the third on-line particle size detector, and the induced draft fan to obtain input signals, and generates a set of output signals according to the set target discharge particle size and the input signals, and sends them to the first air lock, the second air lock, the solid powder flowmeter, the multiple air inlets of the air classifier bin body, the motor driving the classification wheel to rotate, the second on-line particle size detector, the third on-line particle size detector, and the induced draft fan for execution.

2. The automated grading machine device according to claim 1, wherein The feeding bin is arranged above the buffer bin; among them, A filter element is arranged in the feeding bin, and a first pulse air valve is arranged above to pulse the filter element; A weighing module is arranged in the buffer bin, and the signal of the weighing module is automatically fed back to the PLC control system. The PLC control system sets the upper and lower limits of the powder weight in the buffer bin, and automatically feeds and stops feeding according to the weight fed back by the weighing module.

3. The automated grading machine device according to claim 1, characterized in that, The air classifier bin body includes an upper bin body and a lower bin body; among them, The upper bin body is provided with a feed inlet and the fine powder outlet, and the classification wheel is installed; the fine powder outlet is communicated with the feed inlet of the cyclone separator by a pipeline; The lower bin body includes a first volute guide structure, a conical cylinder body, a coarse powder discharge port, a primary air inlet, a secondary air inlet, and a tertiary air inlet; Among them, the primary air inlet and the secondary air inlet are arranged on the conical cylinder body; valves are installed at the primary air inlet and the secondary air inlet, and the valves are installed with electric control devices, and the opening degrees of the valves can be controlled by the PLC control system; the opening degrees of the valves at the primary air inlet and the secondary air inlet are in the range of 0-90°; The tertiary air inlet is arranged on the first volute guide structure, and an electrically controllable valve is installed at the tertiary air inlet, and the opening degree of the valve can be controlled by the PLC control system, and its opening degree range is in the range of 0-90°; The coarse powder discharge port is installed at the bottom of the lower bin body, and is connected to the third air lock by a flange, and the flange below the third air lock is connected to the discharge pipeline; The first on-line particle size detector is installed at the position of the coarse powder discharge pipeline, on-line detects the particle size of the powder at the coarse powder discharge port, and feeds back the signal to the PLC control system.

4. The automated grading machine equipment according to claim 1, characterized in that, The cyclone bin includes a second volute guide structure and a cyclone tank body, and the second volute guide structure is arranged above the cyclone tank body; the discharge port of the cyclone tank body is installed at the bottom of the cyclone bin, and is connected to the fourth air lock by a flange, and the flange below the fourth air lock is connected to the discharge pipeline; The second on-line particle size detector is installed at the position of the discharge pipeline, and can on-line detect the particle size of the powder at the cyclone discharge port, and feeds back the signal to the PLC control system; The ash discharge port is connected to the feed inlet of the dust removal bin by a pipeline.

5. The automated grading machine device according to claim 1, characterized in that, The dust collection bin further includes a second pulse air valve and a pulse pipeline, which are arranged at the top of the dust removal bin and pulse the dust removal filter bag intermittently; The discharge port of the dust removal bin is installed at the bottom of the dust removal bin, and is connected to the fifth air lock by a flange, and the flange below the fifth air lock is connected to the discharge pipeline; The third on-line particle size detector is installed at the position of the dust removal bin discharge pipeline, and can on-line detect the particle size of the powder at the cyclone discharge port, and feeds back the signal to the PLC control system; The exhaust port is connected to the inlet of the induced draft fan by a pipeline.

6. The automated grading machine equipment according to claim 1, characterized in that, The induced draft fan includes a fan impeller, a volute, and a wheel air valve; The fan impeller is inside the volute; An electric control device is installed on the air valve behind the inlet of the induced draft fan, and the opening degree can be controlled by the PLC control system; the opening degree range of the air valve is in the range of 0-90°.

7. The automated grading machine device according to claim 1, wherein, The electric control cabinet further includes a touch control screen and a plurality of frequency converters; The touch control screen includes an operation page and an alarm page; The electric control devices of the second air lock of the feeding device, the primary air inlet valve of the air classifier, the secondary air inlet valve, the tertiary air inlet valve, the motor driving the classification wheel, the electric control device of the inlet valve of the induced draft fan, and the motor driving the fan blades of the induced draft fan are all equipped with independent frequency converters that can control their frequencies.

8. The automated grading machine equipment according to claim 7, characterized in that, The PLC control system is used for signal acquisition, functional programming and application, signal output, signal reception and execution; The signal acquisition includes the signals collected from the frequency converters of the second air lock for feeding and input into the PLC control program, the signals collected from the solid powder flow meters and input into the PLC control program, the signals collected from the frequency converters controlling the opening degrees of multiple air supplement openings and input into the PLC control system, the signals collected from the frequency converters of the motors driving the classifier wheels and input into the PLC control program, the signals collected from the first on-line particle size detector installed at the position of the coarse powder discharge pipeline and input into the PLC control program, the signals collected from the second on-line particle size detector installed at the position of the cyclone discharge pipeline and input into the PLC control program, the signals collected from the third on-line particle size detector installed at the position of the dust discharge pipeline and input into the PLC control program, the signals collected from the frequency converter controlling the opening degree of the control valve behind the inlet of the induced draft fan and input into the PLC control program, and the signals collected from the frequency converters of the motors driving the fan blades of the induced draft fan and input into the PLC control program; The functional programming includes programming the corresponding functions for the equipment parameters required according to the products with different particle size requirements needed for different powders. The application of the functional programming includes setting the target discharge particle size. The control system automatically calculates the equipment parameters according to the signals collected and input by the particle size detectors and other signals collected and input, in accordance with the function programming selected by the PLC control program, to obtain a set of equipment parameters that meet the requirements of the target value products. The signal output includes the PLC control program outputting the equipment parameters that meet the requirements of the target discharge particle size products calculated according to the function programming to each frequency converter. The signal reception and execution include that each frequency converter immediately executes after receiving the signals sent by the PLC control program.

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