A multiple parallel cyclone unit with online sampling device and online sampling method

Abstract

The invention relates to the technical field of cyclone application, in particular to a plurality of parallel cyclone units with online sampling devices and an online sampling method, wherein a bracket is provided, a material distribution barrel is provided in the middle of the bracket, the lower end of the material distribution barrel is provided as a feed port, a plurality of parallel cyclones are provided on the material distribution barrel, the feed pipe of the cyclone is connected with the side wall of the material distribution barrel through a material distribution branch pipe, a material distribution sampling valve is provided on the material distribution branch pipe, and the material distribution sampling valve is characterized in that the material distribution sampling valve consists of a valve body, a sealing ring, a gate, a support rod, a cylinder, a piston, a solenoid valve and an air source, the solenoid valve is a three-position five-way solenoid valve, an A position sensor, a B position sensor and a D position sensor are provided on the outer wall of the cylinder from top to bottom, the opening amplitude position of the gate in the regulating valve is adjusted by controlling the inflation and deflation amount of the solenoid valve by a controller, and the method has the advantages of simple structure, convenient sampling, good sampling effect, high sampling efficiency and realization of online sampling.

Description

Technical Field

[0001] The invention relates to the technical field of cyclone application, and in particular to a plurality of parallel cyclone units with online sampling devices and an online sampling method, which have simple structure, convenient sampling, good sampling effect, high sampling efficiency and realize online sampling. Background Art

[0002] As we all know, cyclones are widely used in mining, metallurgy, power environmental protection, petroleum, chemical industry and food industry. Cyclones usually use water as the medium, rely on external pumps or gravity fields to deliver power, and use the rotating flow field to accelerate the sedimentation rate of solid particles in the water medium and increase the difference in sedimentation rate between coarse and fine particles in the water medium, thereby achieving rapid separation and classification of particles of different sizes. It has the advantages of small equipment size, large processing capacity and high separation efficiency, and can be widely used in grinding classification, desludging, concentration, solid-liquid separation, coarse and fine particle classification and other processes.

[0003] In industrial production, production and operation personnel need to frequently sample and analyze the feed slurry of the cyclone and the overflow and underflow products after classification in order to master the production and operation status of the cyclone and its upstream and downstream equipment, so as to make reasonable judgments and adjustments to improve production and operation efficiency and benefits. The sampling of the overflow and underflow products of the cyclone is relatively convenient. The overflow and underflow products can be directly obtained at the overflow and underflow discharge pipes of the cyclone operation platform, but it is still difficult to accurately sample the feed samples of the cyclone.

[0004] There are several commonly used methods for sampling the cyclone feed. The first method is to take the feed sample at the feed pump tank of the cyclone. Because the slurry in the feed pump tank will settle, the sampled sample is often not representative. Another method is to take the cyclone feed sample at the discharge branch of the feed pump of the cyclone. Due to the difference in pipe diameter between the discharge pipe and the main pipe, the concentration and particle size of the slurry discharged from the discharge pipe are greatly different from those of the main pipe, which makes the sampled sample not representative. Another sampling method is to set a small sampling tube on the distributor of the cyclone. Due to the installation position, diameter and operating pressure of the sampling tube, the concentration and particle size of the sampled slurry are very different from the actual values, and the control valve of the sampling tube is very easy to be blocked. Summary of the invention

[0005] The purpose of the present invention is to solve the above-mentioned deficiencies of the prior art and to provide a plurality of parallel cyclone units and an online sampling method with an online sampling device which have simple structure, convenient sampling, good sampling effect, high sampling efficiency and realize online sampling.

[0006] The technical solution adopted by the present invention to solve its technical problem is:

[0007] A plurality of parallel cyclone units with an online sampling device is provided with a bracket, a material distribution barrel is provided in the middle of the bracket, the lower end of the material distribution barrel is provided as a feed port, a plurality of parallel cyclones are provided on the material distribution barrel, the feed pipe of the cyclone is connected with the side wall of the material distribution barrel through a material distribution branch pipe, a material distribution sampling valve is provided on the material distribution branch pipe, the overflow pipe of the cyclone is connected with the overflow box on the bracket through a conveying pipe, the underflow port of the cyclone is connected with the underflow box on the bracket through a conveying pipe, and the material distribution sampling valve is characterized in that the material distribution sampling valve is composed of a valve body, a sealing ring, a gate plate, a support rod, The invention is composed of a cylinder, a piston, a solenoid valve and an air source. The solenoid valve is a three-position five-way solenoid valve. Both ends of the valve body are respectively connected to the material distribution branch pipes. The valve body is provided with an adjusting hole. A gate is provided in the adjusting hole. Sealing rings are provided on the adjusting holes on both sides of the gate. The sealing rings are sealingly and slidingly connected with the plate surface of the gate. The lower end of the gate extends into the adjusting hole. The upper end of the gate extends out of the adjusting hole and is connected to the output shaft of the cylinder. The cylinder body of the cylinder is fixedly connected to the valve body via a support rod. A piston is provided in the cylinder. The lower part of the piston is connected to the output shaft of the cylinder. The output shaft extends out of the cylinder and is connected to the gate plate. The upper and lower sides of the cylinder body of the cylinder are respectively provided with upper inlet and outlet holes and lower inlet and outlet holes. The upper inlet and outlet holes and the lower inlet and outlet holes are respectively connected to the two interfaces of the three-position five-way solenoid valve through the connecting air pipe. The pressure port of the solenoid valve is connected to the air source. The two sides of the pressure port of the solenoid valve are respectively provided with air release holes. The air intake and air outlet in the cylinder are controlled by the three-position five-way solenoid valve to realize the up and down lifting of the gate plate. The outer wall of the cylinder is sequentially provided with A position sensor, B position sensor, and D position sensor from top to bottom. The A position sensor is The valve is in full open state, the D position sensor corresponds to the valve fully closed state, the B position sensor corresponds to the gate opening amplitude that is less than 1 / 2 of the valve fully open state, so that the gate opening amplitude of the B position sensor just meets the non-overflow state of the cyclone. The A position sensor, the B position sensor, the D position sensor and the three-position five-way solenoid valve are connected to the controller via signal lines respectively. The controller controls the inflation and deflation volume of the three-position five-way solenoid valve to adjust the opening amplitude position of the gate in the regulating valve, and finally realizes the adjustment of the slurry feed amount distributed to each cyclone.

[0008] A C position sensor is provided between the B position sensor and the D position sensor on the outer wall of the cylinder of the present invention. The C position sensor is connected to the controller via a signal line. The B position sensor corresponds to 1 / 3 to 1 / 2 of the gate opening amplitude, and the C position sensor corresponds to 1 / 6 to 1 / 3 of the gate opening amplitude.

[0009] The B position sensor or the C position sensor or both the B position sensor and the C position sensor described in the present invention are adjustable position sensors that can be moved up and down along the outer wall of the cylinder. The position of the position sensor in the cylinder is adjusted by the adjustable position sensor, thereby adjusting the position of the outer wall of the cylinder where the position sensor is located when the cyclone is in a non-overflow state.

[0010] The A position sensor, B position sensor, C position sensor and D position sensor of the present invention respectively adopt magnetic conductivity Hall proximity switches, and position sensing is realized by magnetic conductivity Hall proximity switches. The cylinder is made of non-magnetic alloy material, and the piston is made of strong magnetic material, and the piston moves to the corresponding position sensor.

[0011] The controller described in the present invention is a PLC programmable logic controller, and a touch operation display screen is provided on the shell of the controller.

[0012] The solenoid valve described in the present invention is arranged on a valve body, a cylinder or a controller.

[0013] An online sampling method for multiple parallel cyclone units with an online sampling device is characterized in that the online sampling method has the following steps: when the multiple parallel cyclone units are in a production working state, feed is fed through the feed port of a distribution barrel, and when the slurry in the distribution barrel runs to the top of the distribution barrel, it enters the parallel cyclones in a working state through a distribution branch pipe. At this time, the distribution sampling valves on each distribution branch pipe are in a fully open state. At this time, the cyclones in a working state have overflow products and underflow products. When it is necessary to sample the feed sample of a single cyclone, the slurry flow entering the cyclone is greatly reduced by adjusting the opening amplitude of the gate in the distribution sampling valve, until the cyclone is adjusted to an operating state in which only the underflow is discharged and no overflow product is discharged. After a period of operation, the underflow outlet of the cyclone is the feed sample of the cyclone, and the feed sample of the cyclone is obtained at the underflow outlet of the cyclone.

[0014] The method for adjusting the opening amplitude of the gate in the material distribution sampling valve described in the present invention is to operate the controller and give an instruction to let the piston move to the B position sensor position or the C position sensor position. The sampling controller will automatically determine the current position of the piston and give an instruction to the three-position five-way solenoid valve to inflate, pushing the piston to move to the B position sensor position or the C position sensor. When the piston moves to the B position sensor position or the C position sensor, the B position sensor position or the C position sensor immediately transmits a signal to the controller, and the three-position five-way solenoid valve immediately executes the instruction of the sampling controller to stop inflating the cylinder, thereby completing the piston stopping at the B position sensor position or the C position sensor position. At this time, the opening amplitude of the gate is about 1 / 3~1 / 2 or 1 / 6~1 / 3, and the corresponding feed flow of the cyclone is greatly reduced until the sampling state of only bottom flow without overflow and maximum flow is met. After the sampling is completed, the sampling controller is operated to make the valve run to the A position sensor in the fully open state or the D position sensor in the fully closed state.

[0015] The running time described in the present invention is not less than 15 seconds.

[0016] The present invention adopts the above structure and sampling method, so it has the advantages of simple structure, convenient sampling, good sampling effect, high sampling efficiency, and realization of online sampling. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a structural schematic diagram of the present invention.

[0018] Figure 2 yes Figure 1 Schematic diagram of the material distribution and sampling valve structure. DETAILED DESCRIPTION

[0019] The present invention is further described below in conjunction with the accompanying drawings:

[0020] As shown in the accompanying drawings, a plurality of parallel cyclone units with an online sampling device are provided, which are provided with a bracket 1, a material distribution barrel 2 is provided in the middle of the bracket 1, the lower end of the material distribution barrel 2 is set as a feed port 3, and a plurality of parallel cyclones 4 are provided on the material distribution barrel 2. The feed pipe of the cyclone 4 is connected to the side wall of the material distribution barrel 2 through a material distribution branch pipe 5, and a material distribution sampling valve 6 is provided on the material distribution branch pipe 5. The overflow pipe of the cyclone 4 is connected to the overflow box 23 on the bracket 1 through a conveying pipe, and the bottom flow port of the cyclone 4 is connected to the bottom flow box 24 on the bracket 1 through a conveying pipe. It is characterized in that the material distribution sampling valve 6 is composed of a valve body 7, a sealing ring 8, a gate plate 9, a support rod 10, a cylinder 11, a piston 12, a solenoid valve 13, and an air source 14. The solenoid valve 13 is set It is a three-position five-way solenoid valve 13, the two ends of the valve body 7 are respectively connected to the material distribution branch pipe 5, the valve body 7 is provided with an adjustment hole, the adjustment hole is provided with a gate plate 9, the adjustment holes on both sides of the gate plate 9 are provided with sealing rings 8, the sealing rings 8 are sealingly and slidingly connected with the plate surface of the gate plate 9, the lower end of the gate plate 9 extends into the adjustment hole, the upper end of the gate plate 9 extends out of the adjustment hole and is connected to the output shaft 27 of the cylinder 11, the cylinder body of the cylinder 11 is fixedly connected to the valve body 7 via the support rod 10, the cylinder 11 is provided with a piston 12, the lower part of the piston 12 is connected to the output shaft 27 of the cylinder 11, the output shaft 27 extends out of the cylinder 11 and is connected to the gate plate 9, the upper and lower sides of the cylinder body of the cylinder 11 are respectively provided with upper inlet and outlet holes 15 and lower inlet and outlet holes 16, the The upper air inlet and outlet holes 15 and the lower air inlet and outlet holes 16 are respectively connected to the two interfaces of the three-position five-way solenoid valve 13 through the connecting air pipe 17. The pressure port of the solenoid valve 13 is connected to the air source 14. The two sides of the upper pressure port of the solenoid valve are respectively provided with air release holes 18. The three-position five-way solenoid valve 13 controls the air inlet and outlet in the cylinder 11 to realize the up and down lifting of the gate 9. The outer wall of the cylinder 11 is provided with A position sensor 19, B position sensor 20, C position sensor 21, and D position sensor 22 from top to bottom. The A position sensor 19 corresponds to the fully open state of the valve, the D position sensor 22 corresponds to the fully closed state of the valve, the B position sensor 20 corresponds to the opening amplitude of the gate in the valve 1 / 3~1 / 2, and the C position corresponds to the opening amplitude of the gate in the valve 1 / 6 ~1 / 3, the B position sensor 20 or the C position sensor 21 or the B position sensor 20 and the C position sensor 21 are both set as adjustable position sensors that can move up and down along the outer wall of the cylinder. The position of the cylinder is adjusted by the adjustable position sensor, so as to adjust the position of the outer wall of the cylinder where the position sensor is located when the cyclone is not overflowing. The A position sensor 19, the B position sensor 20, the C position sensor 21, the D position sensor 22 and the three-position five-way solenoid valve 13 are respectively connected to the controller 25 via the signal line 26. The controller 25 controls the inflation and deflation volume of the three-position five-way solenoid valve 13 to adjust the opening amplitude position of the gate in the regulating valve, and finally realizes the adjustment of the slurry feed amount distributed to each cyclone 4.The A position sensor 19, B position sensor 20, C position sensor 21, and D position sensor 22 respectively use magnetic conductivity Hall proximity switches to achieve position sensing. The cylinder 11 is made of a non-magnetic alloy material, and the piston 12 is a material with strong magnetism. The piston 12 moves to the corresponding position sensor. The controller 25 is a PLC programmable logic controller 25, and a touch operation display screen is provided on the housing of the controller 25. The solenoid valve 13 is provided on the valve body 7, the cylinder 11 or the controller 25. The controller is a PLC programmable logic controller, and a touch operation display screen is provided on the housing of the controller. The solenoid valve is provided on the valve body, the cylinder or the controller.

[0021] The steps of the online sampling method of the present invention are as follows: when a plurality of parallel cyclones 4 are in production working state, the feed port 3 of the feed barrel 2 is fed, and when the slurry in the feed barrel 2 runs to the top of the feed barrel 2, it enters each parallel cyclone 4 through the feed branch pipe 5. At this time, the feed sampling valve 6 on each feed branch pipe 5 is in a fully open state. At this time, each cyclone 4 has overflow products and underflow products. When it is necessary to sample the feed sample of a single cyclone 4, the slurry flow entering the cyclone 4 is greatly reduced by adjusting the opening range of the gate in the feed sampling valve 6. Until the cyclone 4 is adjusted to an operating state where only bottom flow is discharged and no overflow product is discharged, after a period of operation, the bottom flow outlet of the cyclone 4 is the feed sample of the cyclone 4, and the feed sample of the cyclone 4 is obtained at the bottom flow outlet of the cyclone 4. The method for adjusting the opening amplitude of the middle gate of the material distribution sampling valve 6 is to operate the controller 25 and give a command to move the piston 12 to the position of the B position sensor 20 or the position of the C position sensor 21. The sampling controller 25 will automatically determine the current position of the piston 12 and inflate the three-position five-way solenoid valve 13. The piston 12 is pushed to move toward the position of the B position sensor 20 or the C position sensor 21. When the piston 12 moves to the position of the B position sensor 20 or the C position sensor 21, the B position sensor 20 or the C position sensor 21 immediately sends a signal to the controller 25, and the three-position five-way solenoid valve 13 immediately executes the instruction of the sampling controller 25 to stop charging the cylinder 11, thereby completing the piston 12 stopping at the position of the B position sensor 20 or the C position sensor 21. At this time, the opening amplitude of the gate 9 is about 1 / 3~1 / 2 or 1 / 6~1 / 3, corresponding to The feed flow rate of the cyclone 4 is greatly reduced until it meets the sampling state of only underflow without overflow and maximum flow rate. After the sampling is completed, the sampling controller 25 is operated to make the valve run to the A position sensor 19 in the fully open state or the D position sensor 22 in the fully closed state. During the sampling, the opening amplitude of the middle gate of the feed valve is within the maximum value. The maximum value of the opening amplitude of the gate is that the slurry flow rate entering the cyclone 4 just meets the requirement that there is no overflow product in the cyclone 4. The operation time is not less than 15 seconds. The three-position five-way solenoid valve 18 is a medium-pressure type or a medium-sealed type.

[0022] During the operation of the cyclone, the feed pressure is different under different working conditions. Therefore, there are high pressure and low pressure situations in the process of selecting the opening range of the gate in the valve. A separate B position sensor 20 with adjustable up and down positions can be provided. In the process of high feed pressure or low feed pressure, the position of the B position sensor 20 can be adjusted to meet the state of no overflow of the cyclone and only underflow, and the opening range of the gate in the valve is maximized. At this time, the sampling effect is good and the sampling efficiency is high. The B position sensor 20 and the C position sensor 21 can also be provided at the same time and can be adjusted up and down. At this time, when the feed pressure is high, the B position sensor 20 and the C position sensor 21 can be provided at the same time and can be adjusted up and down. When the feed pressure is high, the position where the C position sensor 21 is located is used for sampling. When the feed pressure is low, the position where the C position sensor 21 is located is used for sampling. The B position sensor 20 and the C position sensor 21 can be set with high-pressure and low-pressure sampling positions before leaving the factory. On site, it is only necessary to control the B position sensor 20 or the C position sensor 21 to be turned on or off by the controller according to the feed pressure. The B position sensor 20 and the C position sensor 21 are positionally adjustable through the up and down adjustment components. The up and down adjustment components are composed of a screw, a nut, a bearing, and a limit block arranged on the side of the cylinder. The screw The upper and lower ends are respectively connected to the side walls of the cylinder, a nut is sleeved on the screw, and the lower end of the nut is connected to the limit block through a bearing, one end of the limit block is sleeved on the screw, and the other end of the limit block is connected to the B position sensor 20 or the C position sensor 21, and the B position sensor 20 or the C position sensor 21 is respectively in contact with the outer wall of the cylinder, thereby realizing the upper and lower positions of the B position sensor 20 and the C position sensor 21 are adjustable. The upper and lower adjustment components described in the present invention are not limited to the above-mentioned connection structure, and the adjustable structures of the B position sensor 20 and the C position sensor 21 are all within the protection scope of the present invention. At the same time, The present invention uses four position sensors to implement the functions. The present invention also includes multiple position sensors between position sensor A and position sensor D. Multiple position sensors can adjust the opening amplitude of the gate of the invention under different pressure conditions. Therefore, multiple position sensors are not limited to one or two of the present patent, but also include at least two position sensors. The opening amplitude of the gate mentioned above is the ratio of the height of the gate rising to the diameter of the fluid in the valve. Due to the use of the above-mentioned structure and sampling method, the present invention has the advantages of simple structure, convenient sampling, good sampling effect, high sampling efficiency, and online sampling.

Claims

1. A plurality of parallel cyclone units with an online sampling device, provided with a bracket, a material distribution barrel is provided in the middle of the bracket, the lower end of the material distribution barrel is provided as a feed port, a plurality of parallel cyclones are provided on the material distribution barrel, the feed pipe of the cyclone is connected with the side wall of the material distribution barrel through a material distribution branch pipe, a material distribution sampling valve is provided on the material distribution branch pipe, the overflow pipe of the cyclone is connected with the overflow box on the bracket through a conveying pipe, the underflow port of the cyclone is connected with the underflow box on the bracket through a conveying pipe, characterized in that The material distribution and sampling valve is composed of a valve body, a sealing ring, a gate, a support rod, a cylinder, a piston, a solenoid valve, and an air source. The solenoid valve is set as a three-position five-way solenoid valve. The two ends of the valve body are respectively connected to the material distribution branch pipes. The valve body is provided with an adjusting hole, a gate is provided in the adjusting hole, and sealing rings are provided on the adjusting holes on both sides of the gate. The sealing ring is sealingly and slidingly connected with the plate surface of the gate. The lower end of the gate extends into the adjusting hole, and the upper end of the gate extends out of the adjusting hole and is connected to the output shaft of the cylinder. The cylinder body of the cylinder is fixedly connected to the valve body via a support rod. A piston is provided in the cylinder, and the lower part of the piston is connected to the output shaft of the cylinder. The output shaft extends out of the cylinder and is connected to the gate. The upper inlet and outlet holes and the lower inlet and outlet holes are respectively provided on the upper and lower sides of the cylinder body of the cylinder. The upper inlet and outlet holes and the lower inlet and outlet holes are respectively connected to the two interfaces of the three-position five-way solenoid valve through connecting air pipes. The pressure port is connected to the air source, and vent holes are respectively arranged on both sides of the pressure port of the solenoid valve. The air intake and air outlet in the cylinder are controlled by the three-position five-way solenoid valve to realize the up and down lifting of the gate plate. The outer wall of the cylinder is provided with A position sensor, B position sensor, and D position sensor from top to bottom. The A position sensor corresponds to the fully open state of the valve, the D position sensor corresponds to the fully closed state of the valve, and the opening amplitude of the gate plate in the valve corresponding to the B position sensor is less than 1 / 2 of the fully open state of the valve, so that the opening amplitude of the gate plate adjusted by the position of the B position sensor just meets the non-overflow state of the cyclone. The A position sensor, the B position sensor, the D position sensor and the three-position five-way solenoid valve are respectively connected to the controller via signal lines. The controller controls the inflation and deflation amount of the three-position five-way solenoid valve to adjust the opening amplitude position of the gate plate, and finally realizes the adjustment of the slurry feed amount distributed to each cyclone.

2. A plurality of parallel cyclone units with an online sampling device according to claim 1, characterized in that A C position sensor is provided between the B position sensor and the D position sensor on the outer wall of the cylinder. The C position sensor is connected to the controller via a signal line. The B position sensor corresponds to an opening range of 1 / 3~1 / 2 of the gate plate, and the C position sensor corresponds to an opening range of 1 / 6~1 / 3 of the gate plate.

3. A plurality of parallel cyclone units with an online sampling device according to claim 1, characterized in that The B position sensor or the C position sensor or both the B position sensor and the C position sensor are configured as adjustable position sensors that can be moved up and down along the outer wall of the cylinder. The position of the position sensor in the cylinder is adjusted by adjusting the position of the adjustable position sensor, thereby adjusting the position of the outer wall of the cylinder where the position sensor is located when the cyclone is in a non-overflow state.

4. A plurality of parallel cyclone units with an online sampling device according to claim 1, 2 or 3, characterized in that The A position sensor, B position sensor, C position sensor, and D position sensor respectively use magnetic conductivity Hall proximity switches to achieve position sensing. The cylinder is made of a non-magnetic alloy material, and the piston is made of a strong magnetic material. The piston moves to the corresponding position sensor.

5. A plurality of parallel cyclone units with an online sampling device according to claim 1, characterized in that The controller is a PLC programmable logic controller, and a touch operation display screen is provided on the housing of the controller.

6. A plurality of parallel cyclone units with an online sampling device according to claim 1, characterized in that The solenoid valve is arranged on a valve body, a cylinder or a controller.

7. An online sampling method using a plurality of parallel cyclone units with an online sampling device as claimed in claim 1 for online sampling, characterized in that The steps of the online sampling method are as follows: when multiple parallel cyclone units are in production working state, feed is fed through the feed port of the distribution barrel, and when the slurry in the distribution barrel runs to the top of the distribution barrel, it enters the parallel cyclones in working state through the distribution branch pipe. At this time, the distribution sampling valves on each distribution branch pipe are in a fully open state. At this time, the cyclones in working state have overflow products and underflow products. When it is necessary to sample the feed sample of a single cyclone, the slurry flow entering the cyclone is greatly reduced by adjusting the opening amplitude of the middle gate plate of the distribution sampling valve, until the cyclone is adjusted to an operating state in which only the underflow is discharged and no overflow product is discharged. After a period of operation, the underflow outlet of the cyclone is the feed sample of the cyclone, and the feed sample of the cyclone is obtained at the underflow outlet of the cyclone.

8. The online sampling method of multiple parallel cyclone units with an online sampling device according to claim 7, characterized in that The method for adjusting the opening amplitude of the gate in the material distribution sampling valve is to operate the controller and give an instruction to let the piston move to the B position sensor position or the C position sensor position. The sampling controller will automatically determine the current position of the piston and give an instruction to inflate the three-position five-way solenoid valve, pushing the piston to move to the B position sensor position or the C position sensor. When the piston moves to the B position sensor position or the C position sensor, the B position sensor position or the C position sensor immediately sends a signal to the controller, and the three-position five-way solenoid valve immediately executes the instruction of the sampling controller to stop inflating the cylinder, thereby completing the piston stopping at the B position sensor position or the C position sensor position. At this time, the opening amplitude of the gate is 1 / 3~1 / 2 or 1 / 6~1 / 3, and the corresponding feed flow of the cyclone is greatly reduced until the sampling state of only bottom flow without overflow and maximum flow is met. After the sampling is completed, the sampling controller is operated to make the valve run to the A position sensor in the fully open state or the D position sensor in the fully closed state.

9. The online sampling method of multiple parallel cyclone units with an online sampling device according to claim 7, characterized in that The running time is not less than 15 seconds.

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