Dust concentration instrument calibration method

Abstract

The invention discloses a dust concentration instrument calibration method. The dust concentration instrument calibration method comprises the following steps that S1, a simulated dust environment is built; s2, sampling by a filter membrane method; (S3); cleaning and dedusting; s4, instrument sampling detection; s5, auxiliary detection; s6, dust fluctuation detection; and S7, comparing detection results. Reversing of the sampling end during sampling and after sampling is achieved, so that dust flows away along with airflow after sampling is finished, cleaning and dust removing work is conducted after sampling, and the calibration precision of the instrument body is guaranteed. The operation that a detector does not need to enter the dust air bellow is also realized, and the continuity and efficiency of detection work are ensured; meanwhile, the real-time monitoring of the dust concentration fluctuation condition is realized.

Description

Technical Field

[0001] The invention belongs to the technical field of instrument calibration, and in particular relates to a dust concentration instrument calibration method. Background Art

[0002] At present, when calibrating and testing dust meters, the instrument to be calibrated needs to be placed in a dust environment (such as a chimney or the atmosphere). In order to improve the convenience of calibration, a simulated dust environment is created for the calibration instrument. During calibration, the dust sampling device is also placed in the dust environment. Finally, the detection results of the instrument are compared with the sampling results of the dust sampling device to determine the detection accuracy of the instrument.

[0003] At present, the simulated dust environment equipment created is large in size, and inspection personnel need to enter or probe into the simulated dust environment equipment to install dust sampling equipment. This requires the dust-generating device that generates dust to stop working, which will affect the continuity and work efficiency of the work; at the same time, it is difficult to guarantee whether the dust concentration in the simulated dust environment equipment meets the instrument calibration requirements.

[0004] Moreover, dust sampling equipment is usually arranged horizontally during sampling, and sampling is done against the wind (i.e., the sampling port faces the direction of the wind and dust source). After sampling, since the dust in the dust environment itself will flow, the dust will still enter the dust sampling equipment, resulting in an increase in dust. In this way, when calculating the dust concentration, the overall concentration will increase, seriously affecting the sampling accuracy, and thus affecting the accuracy of the instrument calibration. At the same time, the dust sampling equipment is always in a dusty environment during use, and dust will also adhere to its outer wall. When the filter membrane sampling mechanism is removed for inspection, the dust attached to the outer wall will inevitably fly and fall onto the filter membrane, which will also affect the sampling accuracy and the accuracy of the instrument calibration. Summary of the Invention

[0005] The embodiment of the present invention provides a dust concentration meter calibration method to ensure the calibration accuracy.

[0006] To solve the above technical problems, the technical solution of the embodiment of the present invention is: a dust concentration meter calibration method, comprising the following steps implemented in sequence:

[0007] S1. Create a simulated dust environment: generate dust through a dust source and let it flow in a closed dust bellows;

[0008] S2. Sampling by membrane filter method: The dust in the dust bellows is sampled by a rotary sampling assembly. During the sampling process, the sampling end of the rotary sampling assembly is always directed toward the direction of the dust source. After the sampling is completed, the sampling end of the rotary sampling assembly rotates and deviates from the direction of the dust source.

[0009] S3; cleaning and dust removal: by means of a sliding mechanism provided in the dust bellows, the rotary sampling assembly is moved after the sampling end is rotated to a dust removal box connected to the dust bellows, and the outer wall of the rotary sampling assembly is cleaned and dusted by the cleaning and dust removal mechanism in the dust removal box;

[0010] S4, instrument sampling and testing: During the sampling process in step S2, the dust in the dust bellows is sampled with a sampling tube and sent to the instrument to be calibrated for testing;

[0011] S5. Auxiliary detection: Install and inspect the beta-ray dust concentration measuring instrument through an operation box connected to the dust wind box, slide the beta-ray dust concentration measuring instrument into the dust wind box, and send the collected sample into the beta-ray dust concentration measuring instrument through a sampling tube to perform dust concentration detection;

[0012] S6. Dust fluctuation detection: During steps S1 to S5, a light scattering concentration detector is used to monitor dust fluctuations in the dust bellows in real time;

[0013] S7. Comparison of test results: comparing the test results of the samples collected by the rotary sampling assembly and / or the particle dust concentration results detected by the β-ray dust concentration meter with the test results of the instrument body to be calibrated, and calibrating the instrument body to be calibrated.

[0014] As an improvement, the rotary sampling assembly includes a sampling head body with an air duct inside and a quick-disassembly assembly type, one end of the sampling head body is threadedly connected to an air suction joint, and the other end is threadedly installed with an air inlet head, and the dust removal box is also provided with a vacuum generating mechanism connected to the air suction joint;

[0015] It also includes a mounting base, on which a rotating base driven by a power element is rotatably mounted. The rotating base is sleeved on the sampling head body and clamped and positioned between the sampling head body and the air intake joint. The deflection of the rotating base causes the air intake head to deflect from a horizontal state to a vertical state. The rotation of the rotating base can be manual rotation or automatic rotation.

[0016] As a further improvement, the sampling head body includes a connecting pipe sleeve threadedly connected to the air intake joint, a sleeve is inserted and sealed on the connecting pipe sleeve, a first pressure head is threaded on the sleeve, a second pressure head is threaded on the first pressure head, and the air intake head is threaded on the second pressure head;

[0017] Two pressing blocks are clamped and positioned between the first pressing head and the second pressing head, and a filter membrane is clamped between the two pressing blocks;

[0018] The air intake joint, the connecting pipe sleeve, the sleeve, the first pressure head, the second pressure head and the air intake head are all provided with coaxial hollow structures, and all the hollow structures form the airway.

[0019] As a further improvement, the hollow structures in the first pressure head and the second pressure head are configured to be conical;

[0020] Seals are provided between the sleeve and the first pressure head, between the first pressure head and one of the pressure blocks, between the other pressure block and the second pressure head, and between the second pressure head and the air inlet head;

[0021] An operating handle is provided on the outer wall of the connecting pipe sleeve.

[0022] As a further improvement, an arc-shaped avoidance portion is provided at one corner of the mounting seat, and the arc-shaped avoidance portion is located in the rotation direction of the rotating seat.

[0023] As a further improvement, the sliding mechanism includes a bracket arranged in the dust bellows, the bracket is provided with a first slide rail, a second slide rail driven by a first linear drive element is slidably installed on the first slide rail, and two rotary sampling assemblies are provided on the second slide rail, one of the rotary sampling assemblies is fixed on the second slide rail, and the other rotary sampling assembly is slidably installed on the second slide rail through the mounting seat and is driven by the second linear drive element.

[0024] As an improvement, the cleaning and dust removal mechanism includes an air pipe connector provided on the dust removal box, the air pipe connector is connected to a spray gun, and the spray gun is arranged in an operating chamber of the dust removal box; an operating hole is provided on the door panel of the dust removal box corresponding to the operating chamber; an end cap is threadedly mounted on the air inlet head;

[0025] The cleaning and dust removal mechanism also includes at least one filter cartridge connected to the fan, the filter cartridge is arranged in the dust removal chamber of the dust removal box, a dust removal orifice plate is provided on the dust removal box between the dust removal chamber and the operating chamber, and an air intake orifice plate is also provided on the dust removal box corresponding to the operating chamber.

[0026] As an improvement, a box is provided on the periphery of the beta-ray dust concentration measuring instrument, a slide driven by a third linear drive element is provided on the box, the sampling tube extends to the outside of the box, and the light scattering concentration detector is provided on the box;

[0027] A support frame is provided in the dust bellows, and a guide rail that is slidably matched with the slide seat is provided on the support frame.

[0028] As a further improvement, a clamp is provided on the top of the box, and the light scattering concentration detector is clamped and positioned on the clamp;

[0029] The box body is provided with an air pipe joint, and the air pipe joint is connected with positive pressure gas.

[0030] As a further improvement, partitions are inserted between the dust wind box and the dust removal box, and between the dust wind box and the operation box, and the partitions are driven by a fourth linear drive element.

[0031] After adopting the above technical solution, the effects of the embodiment of the present invention are:

[0032] The detailed process flow of the dust concentration meter calibration method is as follows: the dust generated by the dust source enters the dust bellows and flows, and the sample is sent to the meter body for detection through the sampling tube; at the same time, synchronous sampling is performed through the rotary sampling assembly, specifically: the sampling end of the rotary sampling assembly is facing the direction of the dust source in the dust bellows and performs sampling. After the sampling is completed, the rotary sampling assembly rotates 90 degrees and the sampling end deviates from the direction of the dust source, so that the flow direction of the dust is perpendicular to the direction of the air inlet head, and the dust will flow away with the air flow; after that, the rotary sampling assembly is made to enter the dust removal box through the sliding mechanism and pass through The cleaning and dust removal mechanism cleans the outer wall of the rotary sampling assembly and removes dust after cleaning. The collected samples are then tested and the test results are compared with the test results of the instrument body to determine the accuracy of the instrument body test results and achieve the purpose of calibration. The collected samples can also be sent to the β-ray dust concentration meter through the sampling tube for auxiliary calibration. After that, the particle dust concentration detected by the β-ray dust concentration meter is compared with the test results of the instrument body to determine the accuracy of the instrument body test results and achieve the purpose of auxiliary calibration. After the sampling is completed, the β-ray dust concentration meter slides into the operation box for operation. During the calibration of the instrument body, the rotary sampling assembly and the β-ray dust concentration meter can be used simultaneously or one of them can be selected for use. During the above sampling process, the particle dust concentration is simultaneously monitored by the light scattering concentration detector to determine whether the current dust concentration fluctuates and whether it meets the requirements of the instrument calibration.

[0033] In summary, the use of this dust concentration meter calibration method achieves the simultaneous detection and sampling of the instrument body, and the direction of the sampling end of the rotary sampling assembly during sampling is consistent with the flow direction of wind and dust, and the direction of the sampling end after sampling is inconsistent with the flow direction of dust. In this way, after the sampling is completed, the dust will flow away with the airflow and will not enter the rotary sampling assembly. The dust on the filter membrane in the rotary sampling assembly is the dust left by the sampling. At the same time, the cleaning and dust removal of the rotary sampling assembly after sampling is achieved, thereby effectively ensuring the sampling accuracy and the accuracy of the instrument body calibration. In addition, it also achieves the effect of not requiring detection personnel to enter the dust bellows for operation (disassembly, maintenance, etc.), thereby ensuring the continuity and efficiency of the instrument body detection work; at the same time, it achieves real-time monitoring of particulate dust concentration fluctuations.

[0034] Since the rotary sampling assembly includes a sampling head body with an air duct inside and a quick-disassembly assembly type, one end of the sampling head body is threadedly connected to the suction joint, and the other end is threadedly installed with an air inlet head, and a vacuum generating mechanism connected to the suction joint is also provided in the dust removal box; it also includes a mounting seat, on which a rotating seat driven by a power element is rotatably installed, the rotating seat is mounted on the sampling head body, and is clamped and positioned between the sampling head body and the suction joint, so that in use, the vacuum generating mechanism is used to realize suction sampling of the rotary sampling assembly, and the rotation is driven by the power element to realize the switching of the sampling end (air inlet head) of the rotary sampling assembly under different working conditions; at the same time, through the threaded installation of the air inlet head, air inlet heads of different calibers can be replaced. When the sampling power is constant, the wind speed of the air entering the air inlet head can be changed to realize constant-speed sampling that matches the wind speed in the sampling environment.

[0035] The sampling head body includes a connecting sleeve threadedly connected to the suction joint, a sleeve is sealed on the connecting sleeve, a first pressure head is threaded on the sleeve, a second pressure head is threadedly connected to the first pressure head, and an air intake head is threaded on the second pressure head; two pressure blocks are clamped and positioned between the first pressure head and the second pressure head, and a filter membrane is clamped between the two pressure blocks; the suction joint, the connecting sleeve, the sleeve, the first pressure head, the second pressure head and the air intake head are all provided with a coaxial hollow structure, and all the hollow structures form an airway, so that the disassembly and assembly of various components such as the connecting sleeve are realized through the above structure, the structure is simple, and the disassembly and assembly are fast and convenient.

[0036] Since the hollow structures in the first pressure head and the second pressure head are set to be conical, the conical structure can slow down the wind speed entering the air inlet head, which is conducive to the uniform distribution of dust on the filter membrane.

[0037] Since seals are provided between the sleeve and the first pressure head, between the first pressure head and one of its middle pressure blocks, between the other pressure block and the second pressure head, and between the second pressure head and the air inlet head, the sealing of the sampling head body is ensured; since an operating handle is provided on the outer wall of the connecting pipe sleeve, the convenience of disassembly and assembly of the sampling head body is improved through the operating handle.

[0038] Since an arc-shaped avoidance portion is provided at one corner of the mounting seat, and the arc-shaped avoidance portion is located in the rotation direction of the rotating seat, the arc-shaped avoidance portion can avoid mutual interference between the mounting seat and the rotating seat, and is conducive to improving the compactness after installation.

[0039] Since the sliding mechanism includes a bracket arranged in the dust bellows, a first slide rail is provided on the bracket, a second slide rail driven by a first linear drive element is slidably installed on the first slide rail, and two rotary sampling assemblies are provided on the second slide rail, one of the rotary sampling assemblies is fixed on the second slide rail, and the other rotary sampling assembly is slidably installed on the second slide rail through a mounting seat and driven by the second linear drive element, thereby realizing the movement of the rotary sampling assembly between the dust bellows and the dust removal box through the above-mentioned sliding mechanism, with a simple structure and good connection.

[0040] Since the cleaning and dust removal mechanism includes an air pipe connector arranged on the dust removal box, the air pipe connector is connected to a spray gun, and the spray gun is arranged in the operating chamber of the dust removal box; an operating hole is provided on the dust removal box door panel corresponding to the operating chamber; an end cover is threadedly installed on the air intake head, so when dusting the outer wall of the rotary sampling assembly, the staff first installs the end cover on the air intake head through the operating hole, and then performs cleaning work with the spray gun to prevent dust from entering the sampling head body and affecting the sampling accuracy.

[0041] Since the cleaning and dust removal mechanism also includes at least one filter cartridge connected to the fan, the filter cartridge is arranged in the dust removal chamber of the dust removal box, a dust removal orifice plate is provided on the dust removal box between the dust removal chamber and the operating chamber, and an air intake orifice plate is also provided on the dust removal box corresponding to the operating chamber. Therefore, during dust removal, the fan is working, and fresh air enters the operating chamber through the air intake orifice plate, and then enters the dust removal chamber together with the dust through the dust removal orifice plate, and then is removed by the filter cartridge. The structure is simple, and the connection between the cleaning and dust removal processes is good.

[0042] Since a box is provided on the periphery of the β-ray dust concentration measuring instrument, a slide driven by a third linear drive element is provided on the box, a sampling tube extends to the outside of the box, and a light scattering concentration detector is arranged on the box; a support frame is provided in the dust bellows, and a guide rail that slides with the slide is provided on the support frame, so that the box not only facilitates the installation of the light scattering concentration detector in the bellows, but also prevents particulate dust from entering the box.

[0043] Since a clamp is provided on the top of the box, the light scattering concentration detector is clamped and positioned on the clamp, which has a simple structure, is easy to assemble and disassemble, and has a good fixing effect on the light scattering concentration detector; an air pipe joint is provided on the box, and the air pipe joint is connected to a positive pressure gas, so that during the sampling process, the box always maintains a positive pressure, further avoiding the particulate matter and dust in the bellows from entering the box during detection, which affects the sampling accuracy of the beta-ray dust concentration measuring instrument.

[0044] Since partitions are inserted between the dust bellows and the dust collection box, and between the dust bellows and the operation box, the partitions are driven by the fourth linear drive element, so that the dust bellows and the dust collection box, and between the dust bellows and the operation box are isolated from each other through the partitions, thereby preventing dust from entering the dust collection box and the operation box from the dust bellows during the sampling process. BRIEF DESCRIPTION OF THE DRAWINGS

[0045] The present invention will be further described below with reference to the accompanying drawings and examples.

[0046] Figure 1 It is a process flow chart of a dust concentration meter calibration method according to an embodiment of the invention;

[0047] Figure 2 This is the outline drawing of the equipment used to implement this dust concentration meter calibration method;

[0048] Figure 3 yes Figure 2 Schematic diagram of the structure after removing the dust bellows;

[0049] Figure 4 yes Figure 3 A magnified view of middle A;

[0050] Figure 5 yes Figure 3 Schematic diagram of the structure of the rotary sampling assembly, sliding mechanism and dust removal box;

[0051] Figure 6 yes Figure 5 Schematic diagram of the structure from another angle;

[0052] Figure 7 yes Figure 5 Structural schematic diagram of another working state (dust removal state);

[0053] Figure 8 yes Figure 7 Schematic diagram of the structure of the rotary sampling assembly;

[0054] Figure 9 yes Figure 8 B-direction view in;

[0055] Figure 10 yes Figure 9 Cross-sectional view of the middle CC section;

[0056] Figure 11 yes Figure 2 Schematic diagram of the structure of the middle operation box and the dust blower at another angle;

[0057] Figure 12 yes Figure 11 Schematic diagram of the structure after removing the operation box;

[0058] Figure 13 yes Figure 12 A cross-sectional view of a light scattering concentration detector;

[0059] Among them, 1-dust bellows; 101-channel; 102-partition; 103-fourth linear drive element; 2-dust removal box; 201-operating chamber; 202-operating hole; 203-dust removal chamber; 204-dust removal orifice plate; 205-air inlet orifice plate; 206-vacuum pump; 207-vacuum tank; 208-suction connecting pipe head; 3-sliding mechanism; 301-bracket; 302-first slide rail; 303-first linear drive element; 304-second slide rail; 305-second linear drive element; 4-rotary sampling assembly; 401-air channel; 402-suction connector; 403-air inlet head; 404-mounting seat; 4041-arc-shaped avoidance portion; 405-power element; 406-rotating seat ;407-connecting pipe sleeve;4071-operating handle;408-sleeve;409-first pressure head;410-second pressure head;411-pressure block;412-filter membrane;413-seal;414-end cover;5-cleaning and dust removal mechanism;501-air pipe connector;502-filter cartridge;6-instrument body;601-sampling tube;602-bevel groove;7-operating box;701-sampling tube;702-box;703-third linear drive element;704-slide;705-support frame;706-guide rail;707-clamp;708-trachea connector;8-light scattering concentration detector;801-detection channel;802-light trap;803-light receiver;804-light source. DETAILED DESCRIPTION

[0060] The present invention is further described in detail below through specific examples.

[0061] like Figure 1 As shown, a dust concentration meter calibration method includes the following steps implemented in sequence:

[0062] S1. Create a simulated dust environment: generate dust through a dust source and allow the dust to flow in a closed dust bellows 1;

[0063] S2. Sampling by membrane filter method: The dust in the dust bellows 1 is sampled by the rotary sampling assembly 4. During the sampling process, the sampling end of the rotary sampling assembly 4 is always facing the direction of the dust source; after the sampling is completed, the sampling end of the rotary sampling assembly 4 rotates and deviates from the direction of the dust source;

[0064] S3; cleaning and dust removal: by providing a sliding mechanism 3 in the dust bellows 1, the sampling end is rotated and the rotary sampling assembly 4 is moved to the dust box 2 connected to the dust box 1, by cleaning the dust box 2, the dust removal mechanism 5 on the outer wall of the rotary sampling assembly 4 is cleaned and dusted;

[0065] S4, instrument sampling and testing: During the sampling process in step S2, the dust in the dust wind box 1 is sampled using the sampling tube 601 and sent to the instrument body 6 to be calibrated for testing;

[0066] S5. Auxiliary testing: Install and inspect the β-ray dust concentration measuring instrument through the operation box 7 connected to the dust wind box 1. Slide the β-ray dust concentration measuring instrument into the dust wind box 1. Send the collected sample to the β-ray dust concentration measuring instrument through the sampling tube 701 for dust concentration testing.

[0067] S6. Dust fluctuation detection: During steps S1 to S5, the dust fluctuation in the dust bellows 1 is monitored in real time by the light scattering concentration detector 8;

[0068] S7. Comparison of test results: Compare the test results of the sample collected by the rotary sampling assembly 4 and / or the particle dust concentration results detected by the β-ray dust concentration meter with the test results of the instrument body 6 to be calibrated to determine whether the instrument body 6 to be calibrated meets the requirements.

[0069] like Figure 2 and Figure 3 、 Figures 5 to 7 ,as well as Figure 11 and Figure 12As shown together, the specific structure, position and connection relationship of the relevant devices for implementing the above-mentioned dust concentration meter calibration method are as follows: one end of the dust bellows 1 is connected to the dust source and the other end is connected to the fan, at least one instrument body 6 to be calibrated, the instrument body 6 is located outside the dust bellows 1, and the instrument body 6 is connected to a sampling tube 601 extending into the dust bellows 1; a dust removal box 2 is provided on one side of the dust bellows 1, a sliding mechanism 3 is provided in the dust bellows 1, a rotary sampling assembly 4 is provided on the sliding mechanism 3, the dust removal box 2 is located in the sliding direction of the sliding mechanism 3, and A cleaning and dust removal mechanism 5 is provided in the dust removal box 2. When in the sampling state, the sampling end of the rotary sampling assembly 4 faces the direction of the dust source. When in the non-sampling state, the rotary sampling assembly 4 rotates and deviates from the direction of the dust source. The other side of the dust bellows 1 is also connected to an operating box 7. A β-ray dust concentration measuring instrument (not shown in the figure) is slidably installed in the dust bellows 1 at a position corresponding to the operating box 7. The β-ray dust concentration measuring instrument is connected to a sampling tube 701, and the inlet of the sampling tube 701 faces the direction of the dust source. A light scattering concentration detector 8 is also provided in the dust bellows 1.

[0070] In this solution, the sampling end of the sampling tube 601 is provided with an inclined surface groove 602 facing the direction of the dust source (see Figure 4 ), the sampling tube 601 is arranged between the rotary sampling assembly 4 and the β-ray dust concentration measuring instrument; a channel 101 is provided between the dust bellows 1 and the dust removal box 2 and the operation box 7 for realizing mutual communication between the two, and a partition 102 is slidably inserted between the dust bellows 1 and the dust removal box 2, and between the dust bellows 1 and the operation box 7 at the corresponding position of the channel 101, and the partition 102 is driven by a fourth linear drive element 103 (such as: a cylinder or an oil cylinder, etc.).

[0071] The beta-ray dust concentration measuring instrument is a prior art. The structure of its specific working part can be found in the invention patent application with application number: 202311736882.3. The working process is as follows: the dust collected by the sampling tube 701 enters the filter belt in the beta-ray dust concentration measuring instrument, and the particles on the filter belt absorb the beta rays, so that the intensity of the beta rays is attenuated. The amount of dust particles on the filter belt can be obtained by the amount of intensity attenuation, thereby obtaining the particle concentration in the sampling environment; the light scattering concentration detector 8 is also a prior art (see Figure 13), the structure of its specific working part can be found in the invention patent application with application number: 202311728885.2. The specific detection process is: the dust-laden airflow flows through the detection channel 801 on the light scattering concentration detector 8, and the light generated by the light source 804 will pass through the detection channel 801. When there are no particulate matter in the airflow, the light will directly enter the light trap 802 and be absorbed. After the particulate matter in the dust-laden airflow flows through the detection channel 801, the light will shine on the particulate matter to form scattered light, and then the heat dissipation light is received by the light receiver 803 after passing through the focusing lens group. In this way, the light intensity received by the light receiver 803 can detect the amount of particulate matter, and finally detect the concentration of the particulate matter.

[0072] like Figures 8 to 10 As shown together, the rotary sampling assembly 4 includes a sampling head body with an internal air passage 401 and a quick-disassembly assembly type. One end of the sampling head body is threadedly connected to an air intake connector 402, and the other end (sampling end) is threadedly mounted with an air inlet head 403. It also includes a mounting base 404, on which a rotating base 406 driven by a power element 405 (such as a motor, etc.) is rotatably mounted. The rotating base 406 is mounted on the sampling head body and clamped and positioned between the sampling head body and the air intake connector 402. In this embodiment, the rotating base 406 is configured to be L-shaped, and one of the corners of the mounting base 404 is provided with an arc-shaped avoidance portion 4041, which is located in the rotation direction of the rotating base 406.

[0073] The sampling head body includes a connecting sleeve 407 threadedly connected to the air intake connector 402, a sleeve 408 sealedly inserted into the connecting sleeve 407, a first pressure head 409 threadedly connected to the first pressure head 409, a second pressure head 410 threadedly connected to the second pressure head 410, and an air intake head 403 threadedly connected to the second pressure head 410; two pressure blocks 411 are clamped and positioned between the first pressure head 409 and the second pressure head 410, and a filter membrane 412 is clamped between the two pressure blocks 411; the air intake connector 402, the connecting sleeve 407, the sleeve 408, the first pressure head 409, the second pressure head 410, and the air intake head 403 are all provided with coaxial hollow structures, and all of these hollow structures form an airway 401. In this embodiment, the hollow structures within the first pressure head 409 and the second pressure head 410 are configured to be conical.

[0074] Seals 413 are provided between the sleeve 408 and the first pressure head 409, between the first pressure head 409 and one of its middle pressure blocks 411, between the other pressure block 411 and the second pressure head 410, and between the second pressure head 410 and the air inlet head 403; an operating handle 4071 is provided on the outer wall of the connecting pipe sleeve 407.

[0075] like Figures 5 to 7As shown together, the sliding mechanism 3 includes a bracket 301 arranged in the dust wind box 1, and a first slide rail 302 is provided on the bracket 301. A second slide rail 304 driven by a first linear drive element 303 (such as a cylinder or an oil cylinder) is slidably mounted on the first slide rail 302. Two rotary sampling assemblies 4 are provided on the second slide rail 304, one of which is fixed on the second slide rail 304, and the other rotary sampling assembly 4 is slidably mounted on the second slide rail 304 through a mounting seat 404 and driven by a second linear drive element 305 (such as a cylinder or an oil cylinder).

[0076] like Figures 5 to 7 As shown in common, the cleaning and dust removal mechanism 5 includes an air pipe connector 501 arranged on the dust removal box 2, and the air pipe connector 501 is connected to a spray gun. The spray gun is selected from the spray gun in the prior art, so it is not shown in the figure. The spray gun is arranged in the operating chamber 201 of the dust removal box 2; an operating hole 202 is provided on the door panel of the dust removal box 2 corresponding to the operating chamber 201; an end cover 414 is threadedly installed on the air intake head 403; the cleaning and dust removal mechanism 5 also includes at least one filter cartridge 502 connected to the fan, and the filter cartridge 502 is arranged in the dust removal chamber 203 of the dust removal box 2, and a dust removal orifice plate 204 is provided on the dust removal box 2 between the dust removal chamber 203 and the operating chamber 201, and an air intake orifice plate 205 is also provided on the dust removal box 2 corresponding to the operating chamber 201.

[0077] The dust removal box 2 is also provided with a vacuum generating mechanism connected to the suction connector 402. The vacuum generating mechanism includes a vacuum tank 207 and multiple vacuum pumps 206 arranged in the dust removal box 2. The vacuum tank 207 is provided with multiple suction connecting pipe heads 208 connected to the suction connector 402. The vacuum tank 207 is also provided with a pump connecting pipe head connected to the vacuum pump 206 (not shown in the figure).

[0078] like Figure 12 As shown, the beta-ray dust concentration measuring instrument is provided with a housing 702 on the periphery, on which a slide 704 driven by a third linear drive element 703 (such as a pneumatic cylinder or an oil cylinder) is provided. The sampling tube 701 extends to the outside of the housing 702, and the light scattering concentration detector 8 is provided on the housing 702. A support frame 705 is provided inside the dust bellows 1, and a guide rail 706 is provided on the support frame 705 for sliding engagement with the slide 704. Preferably, a clamp 707 is provided on the top of the housing 702, and the light scattering concentration detector 8 is clamped and positioned on the clamp 707. The housing 702 is provided with an air pipe connector 708, which is connected to a positive pressure gas.

[0079] The above-described embodiments are merely descriptions of preferred implementations of the present invention and are not intended to limit the scope of the present invention. Various modifications and alterations to the technical solutions of the present invention without departing from the spirit of the present invention shall fall within the scope of protection defined by the claims of the present invention.

Claims

1. A dust concentration meter calibration method, characterized by: The method includes the following steps to be implemented in sequence: S1. Create a simulated dust environment: generate dust through a dust source and let it flow in a closed dust bellows; S2. Sampling by membrane filter method: The dust in the dust bellows is sampled by a rotary sampling assembly. During the sampling process, the sampling end of the rotary sampling assembly is always directed toward the direction of the dust source. After the sampling is completed, the sampling end of the rotary sampling assembly rotates and deviates from the direction of the dust source. S3; cleaning and dust removal: by means of a sliding mechanism provided in the dust bellows, the rotary sampling assembly is moved after the sampling end is rotated to a dust removal box connected to the dust bellows, and the outer wall of the rotary sampling assembly is cleaned and dusted by the cleaning and dust removal mechanism in the dust removal box; S4, instrument sampling and testing: During the sampling process in step S2, the dust in the dust bellows is sampled with a sampling tube and sent to the instrument to be calibrated for testing; S5. Auxiliary detection: Install and inspect the beta-ray dust concentration measuring instrument through an operation box connected to the dust wind box, slide the beta-ray dust concentration measuring instrument into the dust wind box, and send the collected sample into the beta-ray dust concentration measuring instrument through a sampling tube to perform dust concentration detection; S6. Dust fluctuation detection: During steps S1 to S5, a light scattering concentration detector is used to monitor dust fluctuations in the dust bellows in real time; S7. Comparison of test results: comparing the test results of the samples collected by the rotary sampling assembly and / or the particle dust concentration results detected by the β-ray dust concentration meter with the test results of the instrument body to be calibrated, and calibrating the instrument body to be calibrated.

2. A dust concentration meter calibration method according to claim 1, characterized in that: The rotary sampling assembly includes a sampling head body with an air passage inside and a quick-disassembly assembly type. One end of the sampling head body is threadedly connected to an air suction joint, and the other end is threadedly installed with an air inlet head. The dust removal box is also provided with a vacuum generating mechanism connected to the air suction joint. It also includes a mounting base, on which a rotating base driven by a power element is rotatably mounted. The rotating base is sleeved on the sampling head body and clamped and positioned between the sampling head body and the air intake joint. The deflection of the rotating base causes the air intake head to deflect from a horizontal state to a vertical state. The rotation of the rotating base can be manual rotation or automatic rotation.

3. A dust concentration meter calibration method according to claim 2, characterized in that: The sampling head body includes a connecting pipe sleeve threadedly connected to the air intake joint, a sleeve is inserted and sealed on the connecting pipe sleeve, a first pressure head is threaded on the sleeve, a second pressure head is threadedly connected to the first pressure head, and the air intake head is threadedly connected to the second pressure head; Two pressing blocks are clamped and positioned between the first pressing head and the second pressing head, and a filter membrane is clamped between the two pressing blocks; The air intake joint, the connecting pipe sleeve, the sleeve, the first pressure head, the second pressure head and the air intake head are all provided with coaxial hollow structures, and all the hollow structures form the airway.

4. A dust concentration meter calibration method according to claim 3, characterized in that: The hollow structures in the first pressure head and the second pressure head are configured as cones; Seals are provided between the sleeve and the first pressure head, between the first pressure head and one of the pressure blocks, between the other pressure block and the second pressure head, and between the second pressure head and the air inlet head; An operating handle is provided on the outer wall of the connecting pipe sleeve.

5. A dust concentration meter calibration method according to claim 4, characterized in that: An arc-shaped avoidance portion is provided at one corner of the mounting seat, and the arc-shaped avoidance portion is located in the rotation direction of the rotating seat.

6. A dust concentration meter calibration method according to any one of claims 1 to 5, characterized in that: The sliding mechanism includes a bracket arranged in the dust bellows, a first slide rail is provided on the bracket, a second slide rail driven by a first linear drive element is slidably mounted on the first slide rail, and two rotary sampling assemblies are provided on the second slide rail, one of the rotary sampling assemblies is fixed on the second slide rail, and the other rotary sampling assembly is slidably mounted on the second slide rail through the mounting seat and driven by the second linear drive element.

7. A dust concentration meter calibration method according to claim 1, characterized in that: The cleaning and dust removal mechanism includes an air pipe connector provided on the dust removal box, the air pipe connector is connected to a spray gun, and the spray gun is arranged in the operation chamber of the dust removal box; an operation hole is provided on the door panel of the dust removal box corresponding to the operation chamber; an end cap is threadedly mounted on the air inlet head; The cleaning and dust removal mechanism also includes at least one filter cartridge connected to the fan, the filter cartridge is arranged in the dust removal chamber of the dust removal box, a dust removal orifice plate is provided on the dust removal box between the dust removal chamber and the operating chamber, and an air intake orifice plate is also provided on the dust removal box corresponding to the operating chamber.

8. A dust concentration meter calibration method according to claim 1, characterized in that: The beta-ray dust concentration measuring instrument is provided with a box body on its periphery, a slide driven by a third linear drive element is provided on the box body, the sampling tube extends to the outside of the box body, and the light scattering concentration detector is provided on the box body; A support frame is provided in the dust bellows, and a guide rail that is slidably matched with the slide seat is provided on the support frame.

9. A dust concentration meter calibration method according to claim 8, characterized in that: A clamp is provided on the top of the box, and the light scattering concentration detector is clamped and positioned on the clamp; The box body is provided with an air pipe joint, which is connected to positive pressure gas. The light scattering concentration detector is provided with a detection channel, which is oriented towards the flow direction of the dust-containing gas in the dust bellows. The dust-containing gas flowing in the dust bellows is detected by the light scattering module after passing through the detection channel.

10. A dust concentration meter calibration method according to claim 1, characterized in that: A partition is inserted between the dust wind box and the dust removal box, and between the dust wind box and the operation box. The partition is driven by a fourth linear drive element.

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