A coal powder sampling system

Abstract

The invention relates to the technical field of coal powder sampling. The invention provides a coal powder sampling system, comprising: an intelligent trolley, an action mechanism, a sampling mechanism and a sample screening device; the action mechanism is arranged on the top of the intelligent trolley, the sampling mechanism is fixedly installed on the action mechanism, the sample screening device is fixedly installed in front of the action mechanism on the intelligent trolley, the action mechanism comprises a lifting mechanism and a sliding mechanism package, the lifting mechanism is responsible for height adjustment of the sampling mechanism, and the sliding mechanism is responsible for sampling depth adjustment of the sampling mechanism; the invention can be moved to different positions for sampling, sampling can be achieved in sampling pipe openings at different heights through the action mechanism, rapid classification of samples according to different sample particle sizes can be achieved through the sample screening device, constant speed sampling can be achieved through adjustment of the sampling mechanism, so that the obtained samples are more representative.

Description

Technical Field

[0001] The invention relates to the technical field of coal powder sampling, and in particular to a coal powder sampling system. Background Art

[0002] Coal powder fineness is an indicator that is strictly controlled during the operation of thermal power plant boilers. It is also an important parameter for optimizing combustion and improving the economic efficiency of boiler operation. In order to ensure that power plant boilers use qualified coal powder, obtain higher combustion efficiency, and operate boilers in a safe and economical state, the coal powder fineness must be monitored regularly.

[0003] At present, a coal powder sampling device is installed on the coal powder pipeline, and the existing sampling device is an isokinetic sampler powered by compressed air.

[0004] The main problem of the current coal powder sampling device is the poor representativeness of the sampling. Without adjusting the separator and the pulverizing system, the numerical values ​​of the results of multiple samplings vary greatly, which cannot effectively reflect the actual situation of the coal powder in the pulverizing system, and cannot correctly guide the adjustment of the pulverizing system and boiler combustion, affecting the boiler efficiency. At the same time, the existing coal powder sampler needs to use compressed air as the power, and the low efficiency of gas and powder separation in the form of cyclone separation is the main reason for the poor representativeness of the sampling. The current problems of coal powder sampling devices are:

[0005] Manual samplers rely on manual operation, which varies from person to person and is very arbitrary, resulting in the sampling stroke of the sampling gun cannot be guaranteed; the accuracy, representativeness and consistency of manual sampling are relatively poor, making the sampling results lose their due significance. Summary of the invention

[0006] The present invention provides a coal powder sampling system to solve the technical problems raised by the above background technology.

[0007] In order to solve the above technical problems, the present invention discloses a coal powder sampling system, comprising: an intelligent trolley, an action mechanism, a sampling mechanism and a sample screening device; an action mechanism is provided on the top of the intelligent trolley, the sampling mechanism is fixedly installed on the action mechanism, and the sample screening device is fixedly installed on the intelligent trolley in front of the action mechanism.

[0008] Preferably, a bearing platform is fixedly installed on the rear side of the top of the chassis of the smart car, and an action mechanism is fixedly installed on the top of the bearing platform, and the action mechanism includes a sliding mechanism and a lifting mechanism.

[0009] Preferably, a sliding table is arranged at the top of the lifting mechanism, and the sampling mechanism comprises: a sampling tube in the left and right directions is fixedly connected to the top of the sliding table, a sampling port is opened on the left end of the sampling tube, a spiral rod is rotatably connected to the left and right directions in the sampling tube, the right end of the spiral rod is fixedly connected to pulley one, an raising platform is fixedly installed on the top of the right end of the sampling tube, a second motor is fixedly installed on the right end of the top of the raising platform, the output shaft of the second motor is connected to pulley two, pulley one and pulley two are connected by belt one, and the right end of the sampling tube is fixedly connected to a downward output tube.

[0010] Preferably, the bottom end of the output pipe is fixedly connected to the storage bin, an electromagnetic valve 1 is fixedly installed on the bottom interface of the storage bin, the bottom interface of the electromagnetic valve 1 is fixedly connected to a rubber sleeve, the middle part of one side wall of the storage bin is fixedly connected to the electromagnetic valve 2, the electromagnetic valve 2 is fixedly connected to the turbine blower, the bottom end of the turbine blower is connected to the collecting bag, the middle outer surface of the sampling tube is fixedly connected to the mounting plate, the mounting plate is slidably connected to a pair of spring parts left and right, the left end of the spring part is fixedly connected to the sealing ring, and the side wall of the coal powder conveying pipe is fixedly provided with a plurality of sampling pipe openings of different heights.

[0011] Preferably, a controller is fixedly installed on the right end of the sliding platform, and the controller is electrically connected to the sliding motor, the second motor, and the turbine fan, respectively. A distance sensor 1 is fixedly installed on the left end of the elevated platform, and the distance sensor 1 is aligned with the sampling tube mouth. The right end of the sampling tube is fixedly installed on a distance sensor 2, and the distance sensor 2 is aligned with the supporting platform.

[0012] Preferably, the sample screening device includes: a vibration mechanism, a box body and a sample preparation bin mechanism, a vibration mechanism is provided at the bottom end of the box body, a feed hopper is provided on the right side of the top of the box body, a plurality of first sample preparation bin mechanisms are provided on the right inner wall of the box body at equal intervals from top to bottom, a plurality of second sample preparation bin mechanisms are provided on the left inner wall of the box body at equal intervals from top to bottom, each second sample preparation bin mechanism is located between two adjacent first sample preparation bin mechanisms, and the structures of the first sample preparation bin mechanism and the second sample preparation bin mechanism are symmetrical on the left and right.

[0013] Preferably, the first sample preparation bin mechanism comprises: an oblique filter plate, a right wall of a box body fixedly connected to the oblique filter plate with the lower left and higher right sides, a plurality of filter holes distributed on the oblique filter plate, and the diameter of the filter holes on each layer of the oblique filter plate gradually increases as the height decreases, the bottom end of the oblique filter plate is fixedly connected to the first sample preparation bin in the horizontal direction, the first sample preparation bin is connected to the first drawer for sliding left and right movement, the first drawer slides through the right wall of the box body, a sample rack is provided in the first drawer, a plurality of sample bottles are provided on the sample rack, the first drawer is fixedly connected to a discharge valve 1 on the right side, a horizontal electric telescopic rod is fixedly installed on the left inner wall of the bottom of the box body, the flashlight telescopic rod is fixedly connected to the second drawer, and the second drawer slides left and right movement through the right wall of the box body.

[0014] Preferably, an isokinetic sampling adjustment and evaluation module is included:

[0015] A first acquisition unit is used to acquire the inner diameter of the coal powder conveying pipe and the inner diameter of the sampling pipe;

[0016] The first acquisition unit is used to obtain the total water percentage value of the pulverized coal inside the pulverized coal conveying pipe;

[0017] The second acquisition unit is used to obtain the coal powder flow information and the screw speed value of the inner sampling tube; the coal powder flow information of the sampling tube includes: the coal powder flow rate of the sampling tube;

[0018] A storage unit, used to store the collection results of the first collection unit and the second collection unit after marking the time;

[0019] A quality sensor is used to detect the quality of the pulverized coal sample in the storage bin after sampling;

[0020] The alarm, the controller is electrically connected to the first acquisition unit, the first collection unit, the second collection unit storage unit, the quality sensor, and the alarm, and the controller controls the alarm to sound based on data analysis of the storage unit and the quality sensor, including:

[0021] Step 1: During the sampling period, the sampling mechanism extends into the pulverized coal conveying pipe to perform n test samplings of pulverized coal;

[0022] Step 2: The controller calculates the actual flow rate M of the pulverized coal in the pulverized coal conveying pipe according to the first calculation unit. c , calculate the equivalent coal powder flow rate in the coal powder conveying pipe D is the inner diameter of the pulverized coal conveying pipe;

[0023]

[0024] Where: M c is the actual flow value of coal powder in the coal powder conveying pipe during the sampling period, t i-1 is the initial sampling time value of the sampling mechanism for the ith test sampling of coal powder, t i is the sampling end time value of the sampling mechanism when sampling coal powder in the i-th test, W t0 is the theoretical initial coal quality total water percentage value, W ti K is the total water percentage of coal collected by the first collection unit when the sampling mechanism samples coal powder in the i-th test; S is the area ratio of the cross section of the pulverized coal conveying pipe to the cross section of the sampling pipe, m ti2 For the i-th trial, sample at t i The mass of the pulverized coal sample in the storage bin at the end of sampling, m ti1 For the i-th trial, sample at t i-1 The mass of the pulverized coal sample in the storage bin at the start time of sampling, λ i is the i-th sampling weight ratio coefficient, n is the total number of coal powder sampling tests by the sampling mechanism;

[0025] Step 3: The controller calculates the target coal powder flow rate in the sampling tube according to the equivalent coal powder flow rate in the coal powder conveying pipe. The speed of the second motor is adjusted to thereby change the speed of the screw rod so that the actual pulverized coal flow rate of the sampling tube reaches the target pulverized coal flow rate;

[0026] Step 4: The comparison evaluation unit compares the measured flow rate in the sampling tube obtained by the second acquisition unit with the target coal powder flow rate. When the measured flow rate does not reach the target coal powder flow rate, the alarm will sound an alarm.

[0027] The present invention provides a coal powder sampling system. The sampling mechanism can be moved to different positions for sampling through an intelligent trolley, and sampling can be carried out in sampling tube openings at different heights through an action mechanism. The sampling mechanism can be freely withdrawn and retracted. The sample screening device can be used to quickly classify samples according to the size of the sample particles. The sampling mechanism can be adjusted to achieve constant-speed sampling, so that the samples obtained are more representative. The sampling mechanism can be cleaned by a turbine fan to prevent blockage. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] In order to more clearly illustrate the technical solutions in the present invention or the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0029] Figure 1 It is a front view schematic diagram of the structure of a coal powder sampling system of the present invention;

[0030] Figure 2 It is a top view schematic diagram of a coal powder sampling system of the present invention;

[0031] Figure 3 It is a front schematic diagram of the sample screening device of the present invention.

[0032] Reference numerals:

[0033] 1. Intelligent trolley; 2. Sample screening device; 3. Coal powder conveying pipe; 4. Sampling pipe port; 5. Chassis; 6. Controller; 7. Carrying platform; 8. Fixed plate; 9. Linear slide rail; 10. Sliding motor; 11. Lead screw 1; 12. Sliding seat; 13. Electric lifting column; 14. Sliding table; 15. Slide 1; 16. Guide column; 17. Sampling tube; 18. Sampling port; 19. Screw rod; 20. Pulley 1; 21. Heightening platform; 22. Second motor; 23. Pulley 2; 24. Belt 1; 25. Output pipe; 26. Storage bin; 27. Rubber sleeve; 28. Solenoid valve 1; 29. ​​Turbine fan; 30 , solenoid valve 2; 31, collecting bag; 32, spring part; 33, sealing ring; 34, distance sensor 1; 35, mounting plate; 36, box body 1; 37, feed hopper; 38, first sample preparation bin mechanism; 39, inclined filter plate; 40, filter hole; 41, first sample preparation bin; 42, first drawer; 43, sample rack; 44, sample bottle; 45, discharge valve 1; 46, electric telescopic rod; 47, second drawer; 48, bottom plate; 49, horizontal plate; 50, vertical rod 1; 51, spring 2; 52, baffle; 53, vibration motor; 54, cam 1; 55, distance sensor 2; 56, second sample preparation bin mechanism. DETAILED DESCRIPTION

[0034] In order to make the purpose, technical solution and advantages of the present invention clearer, the technical solution of the present invention will be clearly and completely described below in conjunction with the drawings of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0035] Combine the following Figure 1-Figure 3 Describing the Embodiments of the Invention

[0036] Example 1

[0037] The embodiment of the present invention provides a coal powder sampling system, such as Figure 1-2 As shown, it includes: an intelligent vehicle 1, an action mechanism, a sampling mechanism and a sample screening device 2; an action mechanism is provided on the top of the intelligent vehicle 1, the sampling mechanism is fixedly installed on the action mechanism, and the sample screening device 2 is fixedly installed on the intelligent vehicle 1 in front of the action mechanism.

[0038] A bearing platform 7 is fixedly installed on the rear side of the top of the chassis 5 of the smart car 1, and an action mechanism is fixedly installed on the top of the bearing platform 7.

[0039] The working principle and beneficial effects of the above technical solution are as follows: the intelligent trolley 1 can realize mobile sampling of the sampling system. The intelligent trolley 1 moves to the sampling port 18 side of the coal powder conveying pipe 3 according to the preset program and stops. At this time, the action mechanism operates to lift the sampling mechanism to a specified height and extends it into the sampling port 18 for the first sampling. After the first sampling is completed, the action mechanism extends the sampling mechanism into the sampling pipe ports 4 at different heights in turn for sampling. The sampling mechanism is responsible for isokinetic sampling, and the sample screening device 2 is responsible for screening and classifying the sampled samples into coal powder samples of different particle sizes.

[0040] The present invention provides a coal powder sampling system intelligent trolley 1. The intelligent trolley 1 can realize moving the sampling mechanism to different positions for sampling, and the action mechanism can realize sampling in the sampling tube mouth 4 at different heights. At the same time, the sampling mechanism can be freely withdrawn and retracted. The sample screening device 2 can realize rapid classification of samples according to the size of the sample particles. The sampling mechanism can be adjusted to achieve constant speed sampling, so that the obtained samples are more representative. The sampling mechanism can be cleaned by the turbine fan 29 to prevent blockage.

[0041] Example 2

[0042] On the basis of Example 1, Figure 1-Figure 2 As shown, the action mechanism includes a sliding mechanism and a lifting mechanism, and the sliding mechanism includes: a group of fixed plates 8, a group of fixed plates 8 are symmetrically fixedly connected to the left and right ends of the top of the supporting platform 7, a pair of linear slide rails 9 are fixedly installed at intervals between the fixed plates 8 on the left and right sides, the linear slide rails 9 are fixedly connected to the supporting platform 7, a sliding motor 10 is fixedly installed at one end of the fixed plate 8 on one side, the output shaft of the sliding motor 10 is fixedly connected to a lead screw 11 along the left and right directions, the lead screw 11 rotates and passes through the fixed plates 8 on the left and right sides, the lead screw 1 is threadedly connected to a sliding seat 12, and the sliding seat 12 is connected to the linear slide rail 9 for left and right sliding.

[0043] The lifting mechanism includes: an electric lifting column 13, the top of the sliding seat 12 is fixedly connected to the electric lifting column 13, the top of the electric lifting column 13 is fixedly connected to the sliding platform 14, and a group of vertical slide grooves 15 are provided at the front and rear ends of the right side of the sliding platform 14. The slide groove 15 is slidably connected to the guide column 16 up and down, and the bottom end of the guide column 16 is fixedly connected to the sliding seat 12.

[0044] The sampling mechanism includes: the top of the sliding table 14 is fixedly connected to the sampling tube 17 in the left and right directions, a sampling port 18 is opened on the left end of the sampling tube 17, a spiral rod 19 is rotatably connected to the left and right directions in the sampling tube 17, the right end of the spiral rod 19 is fixedly connected to a pulley 20, an elevated platform 21 is fixedly installed on the top of the right end of the sampling tube 17, a second motor 22 is fixedly installed on the right end of the top of the elevated platform 21, the output shaft of the second motor 22 is connected to a pulley 23, the pulley 20 and the pulley 23 are connected by a belt 24, and the right end of the sampling tube 17 is fixedly connected to a downward output pipe 25.

[0045] The bottom end of the output pipe 25 is fixedly connected to the storage bin 26, the bottom interface of the storage bin 26 is fixedly installed with an electromagnetic valve 28, the bottom interface of the electromagnetic valve 28 is fixedly connected to a rubber sleeve 27, the middle part of one side wall of the storage bin 26 is fixedly connected to an electromagnetic valve 2 30, the electromagnetic valve 2 30 is fixedly connected to a turbine fan 29, the bottom end of the turbine fan 29 is connected to a collecting bag 31, the middle outer surface of the sampling tube 17 is fixedly connected to a mounting plate 35, the mounting plate 35 is slidably connected to a pair of spring members 32 left and right, the left end of the spring member 32 is fixedly connected to a sealing ring 33, and a plurality of sampling pipe openings 4 of different heights are fixedly provided on the side wall of the coal powder conveying pipe 3.

[0046] A controller 6 is fixedly installed on the right end of the sliding platform 14, and the controller 6 is electrically connected to the sliding motor 10, the second motor 22, and the turbine fan 29, respectively. A distance sensor 34 is fixedly installed on the left end of the elevated platform 21, and the distance sensor 34 is aligned with the sampling tube mouth 4. The right end of the sampling tube 17 is fixedly installed on the distance sensor 2 55, and the distance sensor 2 55 is aligned with the supporting platform 7.

[0047] The working principle and beneficial effects of the above technical solution are as follows: when the sampling mechanism needs to reach the target value position, the sliding mechanism starts to work, and the controller 6 controls the operation of the sliding motor 10 to make the lead screw 11 rotate in the fixed plate 8, and the lead screw 11 makes the sliding seat 12 slide left and right on the linear slide rail 9, thereby controlling the sampling tube 17 to slide to the depth in the sampling tube mouth 4, and the sampling tube 17 slides toward the sampling tube 17. The sealing ring 33 will press against the outside of the sampling tube 17, and the spring member 32 provides the sealing member compression force. The distance sensor 1 34 is responsible for the distance measurement of the sliding mechanism, and the distance sensor 2 55 is responsible for the height detection of the lifting mechanism;

[0048] When the sampling tube 17 needs to be lifted, the controller 6 processes the height data sent back by the distance sensor 2 55 and then controls the electric lifting column 13 to lift up. The electric lifting column 13 makes the sliding platform 14 slide upward along the guide column 16 to lift the sampling tube 17, and stops after reaching the target position. On the contrary, the sampling height is lowered, and the controller 6 controls the second motor 22 to operate. The second motor 22 rotates the pulley 1 20. The pulley 1 20 makes the pulley 2 23 and the screw rod 19 rotate synchronously at high speed through the belt 1 24. The screw rod 19 rotates to form a negative pressure state in the sampling tube 17, so that the coal powder enters the sampling tube 17 through the sampling port 18. The coal powder finally enters the storage bin 26 through the output pipe 25 and the rubber sleeve 27 for storage. The rubber sleeve 27 is used to dock with the feed hopper 37 for sealing;

[0049] After each sampling, the electromagnetic valve 2 30 is opened, and the turbine fan 29 is operated to clean the residual coal powder in the sampling tube 17, so that the residual coal powder is sucked into the collection bag 31;

[0050] The coordinated cooperation of the sliding mechanism and the lifting mechanism is conducive to sampling coal powder at different heights, and is also conducive to accurately controlling the sampling depth of the sampling tube 17 entering the coal powder conveying pipe 3. The sampling mechanism can adjust the sampling speed, which is conducive to achieving constant speed sampling. The turbine fan 29 is conducive to cleaning the sampling tube 17 to prevent residual coal powder in the sampling tube 17 from agglomerating and causing blockage.

[0051] Example 3

[0052] On the basis of Example 1, Figure 1 , Figure 3 As shown, the sample screening device 2 includes: a vibration mechanism, a box body 36, a first sample preparation bin mechanism 38 and a second sample preparation bin mechanism 56. The bottom end of the box body 36 is provided with a vibration mechanism, the top right side of the box body 36 is provided with a feed hopper 37, a plurality of first sample preparation bin mechanisms 38 are provided on the right inner wall of the box body 36 at equal intervals from top to bottom, and a plurality of second sample preparation bin mechanisms 56 are provided on the left inner wall of the box body 36 at equal intervals from top to bottom, each second sample preparation bin mechanism 56 is located between two adjacent first sample preparation bin mechanisms 38, and the structures of the first sample preparation bin mechanism 38 and the second sample preparation bin mechanism 56 are bilaterally symmetrical;

[0053] The vibration mechanism comprises: a bottom plate 48, the right end of the top of the chassis 5 is fixedly connected to the bottom plate 48, a plurality of vertical rods 50 are fixedly connected around the top of the bottom plate 48, a spring 2 51 is provided on the outer sleeve of the vertical rod 50, a horizontal plate 49 is provided on the top of the spring 2 51, the top of the horizontal plate 49 is fixedly connected to the bottom end of the box body 36, the horizontal plate 49 is slidably connected to the vertical rod 50 up and down, a baffle 52 is provided on the top of the vertical rod 50, a vibration motor 53 in the front and rear directions is fixedly installed at the center of the bottom end of the horizontal plate 49, the output shaft of the vibration motor 53 is fixedly connected to a cam 54, and the cam 54 is pressed against the bottom plate 48;

[0054] The first sample preparation bin mechanism 38 comprises: an oblique filter plate 39, a right wall of the box body 36 is fixedly connected to the oblique filter plate 39 which is lower on the left and higher on the right, a plurality of filter holes 40 are distributed on the oblique filter plate 39, and the diameter of the filter holes 40 on each layer of the oblique filter plate 39 gradually increases as the height decreases, the bottom end of the oblique filter plate 39 is fixedly connected to a first sample preparation bin 41 in a horizontal direction, the first sample preparation bin 41 is slidably connected to a first drawer 42, the first drawer 42 slides through the right wall of the box body 36, a sample rack 43 is arranged in the first drawer 42, a plurality of sample bottles 44 are arranged on the sample rack 43, the right side of the first drawer 42 is fixedly connected to a discharge valve 45, a horizontal electric telescopic rod 46 is fixedly installed on the inner wall of the left bottom of the box body 36, the flashlight telescopic rod is fixedly connected to a second drawer 47, and the second drawer 47 slides left and right through the right wall of the box body 36.

[0055] The working principle and beneficial effects of the above technical solution are as follows: after the sampling mechanism completes sampling, the storage bin 26 is moved to the designated position above the feed hopper 37 by the action mechanism, and the sample screening device 2 starts to operate. The solenoid valve 2 30 is opened so that the coal powder sample passes through the feed hopper 37 under the action of gravity and falls onto the inclined filter plate 39 on the right side. The sample that meets the target particle size passes through the filter hole 40 and falls into the sample bottle 44 in the first drawer 42 in the first sample preparation bin 41. The remaining sample rolls onto the filter plate of the first sample preparation bin mechanism 38 under the action of gravity for screening, and then falls onto the second sample preparation bin mechanism 56. The first sample preparation bin mechanism 38 and the second sample preparation bin mechanism 56 alternately screen and classify. Finally, the coal powder particles with larger diameters that fail to pass through fall into the second drawer 47. At the same time, the vibration mechanism is running, and the vibration motor 53 drives the cam 54 to rotate and press against the bottom plate 48. The rotation also causes the horizontal plate 49 to slide back and forth along the vertical rod 50 to squeeze the spring 51. The horizontal plate 49 transmits the vibration force to the box body 36, causing the box body 36 to vibrate up and down, assisting the coal powder sample to fall through the filter holes 40 of different diameters, and then fall into different sample preparation bins. When the sample screening is completed, the electric telescopic rod 46 pushes the second drawer 47 to slide out, and the operator pulls out the first drawer 42 and the remaining different drawers, takes out the sample bottle 44, and then opens the discharge valve 45 to collect and discharge the remaining coal powder.

[0056] The sample screening device 2 of the present invention facilitates the sampling mechanism to quickly screen out the coal powder into particle size samples of different diameters after the sampling is completed, so that the operator can classify the coal powder samples in time.

[0057] Example 4

[0058] Based on the embodiments 1-3, an isokinetic sampling adjustment evaluation module is also included:

[0059] The first acquisition unit is used to acquire the inner diameter of the coal powder conveying pipe 3 and the inner diameter of the sampling pipe 17;

[0060] The first acquisition unit is used to obtain the total water percentage value of the pulverized coal inside the pulverized coal conveying pipe 3;

[0061] The second acquisition unit is used to obtain the coal powder flow information of the inner sampling tube 17 and the rotation speed value of the screw rod 19; the coal powder flow information of the sampling tube 17 includes: the coal powder flow rate of the sampling tube 17;

[0062] A storage unit, used to store the collection results of the first collection unit and the second collection unit after marking the time;

[0063] A quality sensor, used to detect the quality of the coal powder sample in the storage bin 26 after sampling;

[0064] The alarm, the controller is electrically connected to the first acquisition unit, the first collection unit, the second collection unit storage unit, the quality sensor, and the alarm, and the controller controls the alarm to sound based on data analysis of the storage unit and the quality sensor, including:

[0065] Step 1: During the sampling period, the sampling mechanism extends into the pulverized coal conveying pipe 3 to perform n test samplings of pulverized coal;

[0066] Step 2: The controller calculates the actual flow rate M of the pulverized coal in the pulverized coal conveying pipe 3 according to the first calculation unit. c , calculate the equivalent coal powder flow rate in the coal powder conveying pipe 3 D is the inner diameter of the pulverized coal conveying pipe 3;

[0067]

[0068] Where: M c is the actual flow value of coal powder in the coal powder conveying pipe 3 during the sampling period, t i-1 is the initial sampling time value of the sampling mechanism for the ith test sampling of coal powder, t i is the sampling end time value of the sampling mechanism when sampling coal powder in the i-th test, W t0 is the theoretical initial coal quality total water percentage value, W ti K is the total water percentage of coal collected by the first collection unit when the sampling mechanism samples coal powder in the i-th test; S is the area ratio of the cross section of the pulverized coal conveying pipe 3 to the cross section of the sampling pipe 17, m ti2 For the i-th trial, sample at t i The mass of the coal powder sample in the storage bin 26 at the end of sampling, m ti1 For the i-th trial, sample at t i-1 The mass of the pulverized coal sample in the storage bin 26 at the start time of sampling, λ i is the i-th sampling weight ratio coefficient, n is the total number of coal powder sampling tests by the sampling mechanism;

[0069] Step 3: The controller calculates the target coal powder flow rate in the sampling tube 17 according to the equivalent coal powder flow rate in the coal powder conveying pipe 3. The speed of the second motor is adjusted to thereby change the speed of the screw rod 19 so that the actual pulverized coal flow rate of the sampling tube reaches the target pulverized coal flow rate;

[0070] Step 4: The comparison evaluation unit compares the measured flow rate in the sampling tube 17 obtained by the second acquisition unit with the target coal powder flow rate. When the measured flow rate does not reach the target coal powder flow rate, the alarm device sounds an alarm.

[0071] The working principle and beneficial effects of the above technical solution are as follows: the isokinetic sampling adjustment evaluation module can perform n test samplings through the sampling mechanism according to the principle of equal area of ​​the entire cross section and the isokinetic sampling principle based on the electrostatic method for speed measurement, and calculate the coal powder data obtained by the first acquisition unit and the second acquisition unit of the test sampling, and guide the sampling mechanism to adjust the target preset value, so that the sampling mechanism can maintain the isokinetic sampling state inside the coal powder conveying pipe 3 when sampling, and finally a truly representative coal powder sample can be obtained from the coal powder conveying pipe 3; the isokinetic sampling adjustment process can obtain the coal powder flow data in the coal powder conveying pipe 3 and the sampling pipe 17, and calculate the coal powder flow value in the coal powder conveying pipe 3 through the first calculation unit, and then calculate the flow velocity v d , the controller controls the speed of the second motor 22, and then adjusts the rotation speed of the screw rod 19, so that the coal powder sampling flow speed in the sampling tube 17 is consistent with that in the coal powder conveying pipe 3, and then the comparison and evaluation unit works to compare the measured flow rate in the sampling tube 17 obtained by the second acquisition unit with the target coal powder flow rate. When the measured flow rate does not reach the target coal powder flow rate, the alarm sounds an alarm to promptly remind the operator to deal with the abnormal state;

[0072] The isokinetic sampling adjustment and evaluation module can help the conveying pipe 3 and the sampling pipe 17 to adjust to the isokinetic sampling state for sampling, ensuring the representativeness of the coal powder sample. The alarm prompts the operator of the abnormal state after adjustment, which is convenient for equipment maintenance and stopping sampling work.

[0073] Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making any creative work are within the scope of protection of the present invention.

[0074] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A coal powder sampling system, characterized in that: include: An intelligent trolley (1), an action mechanism, a sampling mechanism and a sample screening device (2), wherein the action mechanism is arranged on the top of the intelligent trolley (1), the sampling mechanism is fixedly mounted on the action mechanism, and the sample screening device (2) is fixedly mounted on the intelligent trolley (1) in front of the action mechanism; A sliding platform (14) is arranged at the top of the lifting mechanism, and the sampling mechanism comprises: a sampling tube (17) in the left and right directions is fixedly connected to the top of the sliding platform (14); a sampling port (18) is provided on the left end of the sampling tube (17); a spiral rod (19) is rotatably connected to the left and right directions in the sampling tube (17); the right end of the spiral rod (19) is fixedly connected to a pulley (20); a heightening platform (21) is fixedly installed on the top of the right end of the sampling tube (17); a second motor (22) is fixedly installed on the right end of the top of the heightening platform (21); an output shaft of the second motor (22) is connected to a pulley (23); the pulley (20) and the pulley (23) are connected via a belt (24); and the right end of the sampling tube (17) is fixedly connected to a downward output pipe (25); A controller (6) is fixedly mounted on the right end of the sliding platform (14), and the controller (6) is electrically connected to the sliding motor (10), the second motor (22) and the turbine fan (29) respectively; a distance sensor 1 (34) is fixedly mounted on the left end of the raising platform (21), and the distance sensor 1 (34) is aligned with the sampling tube port (4); the right end of the sampling tube (17) is fixedly mounted on a distance sensor 2 (55), and the distance sensor 2 (55) is aligned with the bearing platform (7); The sample screening device (2) comprises: a vibration mechanism, a box body (36), a first sample preparation bin mechanism (38) and a second sample preparation bin mechanism (56), wherein the bottom end of the box body (36) is provided with a vibration mechanism, the top right side of the box body (36) is provided with a feed hopper (37), a plurality of first sample preparation bin mechanisms (38) are arranged at equal intervals from top to bottom on the right side inner wall of the box body (36), a plurality of second sample preparation bin mechanisms (56) are arranged at equal intervals from top to bottom on the left side inner wall of the box body (36), each second sample preparation bin mechanism (56) is located between two adjacent first sample preparation bin mechanisms (38), and the structures of the first sample preparation bin mechanism (38) and the second sample preparation bin mechanism (56) are bilaterally symmetrical; The first sample preparation bin mechanism (38) comprises: an inclined filter plate (39), the right wall of the box body (36) being fixedly connected to the inclined filter plate (39) with a lower left side and a higher right side, a plurality of filter holes (40) being distributed on the inclined filter plate (39), and the diameter of the filter holes (40) on each layer of the inclined filter plate (39) gradually increases as the height decreases, the bottom end of the inclined filter plate (39) being fixedly connected to a first sample preparation bin (41) in a horizontal direction, and the first sample preparation bin (41) being slidably connected to a first drawer (41) in the left and right directions. 2), a first drawer (42) slides through the right wall of the box body (36), a sample rack (43) is provided in the first drawer (42), a plurality of sample bottles (44) are provided on the sample rack (43), the right side of the first drawer (42) is fixedly connected to a discharge valve (45), a horizontal electric telescopic rod (46) is fixedly installed on the left inner wall of the bottom of the box body (36), the flashlight telescopic rod is fixedly connected to the second drawer (47), and the second drawer (47) slides left and right and penetrates the right wall of the box body (36).

2. A coal powder sampling system according to claim 1, characterized in that: A bearing platform (7) is fixedly mounted on the rear top of the chassis (5) of the intelligent vehicle (1), and an action mechanism is fixedly mounted on the top of the bearing platform (7), the action mechanism comprising a sliding mechanism and a lifting mechanism.

3. A coal powder sampling system according to claim 1, characterized in that: The bottom end of the output pipe (25) is fixedly connected to the storage bin (26), the bottom interface of the storage bin (26) is fixedly installed with a solenoid valve 1 (28), the bottom interface of the solenoid valve 1 (28) is fixedly connected to a rubber sleeve (27), the middle part of a side wall of the storage bin (26) is fixedly connected to a solenoid valve 2 (30), the solenoid valve 2 (30) is fixedly connected to a turbine fan (29), the bottom end of the turbine fan (29) is connected to a collecting bag (31), the middle outer surface of the sampling tube (17) is fixedly connected to a mounting plate (35), the mounting plate (35) is slidably connected to a pair of spring members (32) left and right, the left end of the spring member (32) is fixedly connected to a sealing ring (33), and a plurality of sampling pipe openings (4) of different heights are fixedly provided on the side wall of the coal powder conveying pipe (3).

4. A coal powder sampling system according to claim 1, characterized in that: Also includes isokinetic sampling regulation evaluation module: A first acquisition unit, used for acquiring the inner diameter of the coal powder conveying pipe (3) and the inner diameter of the sampling pipe (17); A first acquisition unit is used to obtain the total water percentage value of the pulverized coal inside the pulverized coal conveying pipe (3); The second acquisition unit is used to obtain the coal powder flow information of the inner sampling tube (17) and the rotation speed value of the screw rod (19); the coal powder flow information of the sampling tube (17) includes: the coal powder flow rate of the sampling tube (17); A storage unit, used to store the collection results of the first collection unit and the second collection unit after marking the time; A quality sensor for detecting the quality of the coal powder sample in the storage bin (26) after sampling; The alarm, the controller is electrically connected to the first acquisition unit, the first collection unit, the second collection unit storage unit, the quality sensor, and the alarm, and the controller controls the alarm to sound based on data analysis of the storage unit and the quality sensor, including: Step 1: within the sampling time period, the sampling mechanism extends into the pulverized coal conveying pipe (3) to perform n test samplings of pulverized coal; Step 2: The controller calculates the actual flow rate M of the pulverized coal in the pulverized coal conveying pipe (3) according to the first calculation unit. c , calculate the equivalent pulverized coal flow rate in the pulverized coal conveying pipe (3) D is the inner diameter of the pulverized coal conveying pipe (3); Where: M c is the actual flow rate of pulverized coal in the pulverized coal conveying pipe (3) during the sampling period, t i-1 is the initial sampling time value of the sampling mechanism for the ith test sampling of coal powder, t i is the sampling end time value of the sampling mechanism when sampling coal powder in the i-th test, W t0 is the theoretical initial coal quality total water percentage value, W ti K is the total water percentage of coal collected by the first collection unit when the sampling mechanism samples coal powder in the i-th test; S is the area ratio of the cross section of the pulverized coal conveying pipe (3) to the cross section of the sampling pipe (17), m ti2 For the i-th trial, sample at t i The mass of the coal powder sample in the storage bin (26) at the end of sampling, m ti1 For the i-th trial, sample at t i-1 The mass of the pulverized coal sample in the storage bin (26) at the start time of sampling, λ i is the i-th sampling weight ratio coefficient, n is the total number of coal powder sampling tests by the sampling mechanism; Step 3: The controller calculates the target coal powder flow rate in the sampling tube (17) based on the equivalent coal powder flow rate in the coal powder conveying pipe (3). The rotation speed of the second motor is adjusted to thereby change the rotation speed of the screw rod (19) so that the actual coal powder flow rate of the sampling tube reaches the target coal powder flow rate; Step 4: The comparison evaluation unit compares the measured flow rate in the sampling tube (17) obtained by the second acquisition unit with the target coal powder flow rate. When the measured flow rate does not reach the target coal powder flow rate, the alarm device sounds an alarm.

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