Wind powder pipe coal quality on-line detection platform and detection method for optical detection

Abstract

The invention discloses an air-powder pipe coal quality on-line detection platform for optical detection and a detection method, and belongs to the technical field of coal-fired power plant automatic detection equipment. The coal quality optical online detection platform solves the problems that an existing coal quality optical online detection platform is incomplete in function and large in influence on measurement precision. The lower part of the sampling pipe is inserted into the upper part of the upper air seat and is communicated with the pneumatic butterfly valve through the upper air seat, the group of correlation light detectors are oppositely and fixedly arranged on the two sides of the lower base, the air outlet ends of the two third air inlet holes are oppositely arranged, and the temperature measuring device is fixedly inserted into one side wall of the base and is used for detecting and adjusting the temperature in a to-be-detected cavity. And the temperature measuring device is in threaded connection with the base. The pneumatic butterfly valve serves as an isolating switch device between the powder taking cavity and the to-be-detected cavity, and the powder taking cavity and the to-be-detected cavity can be communicated and isolated in time. During external detection, the pneumatic butterfly valve is closed, so that the sample in the to-be-detected cavity is in a relatively isolated state, and the detection precision is improved.

Description

Technical Field

[0001] The invention relates to an air-powder pipe coal quality online detection platform and a detection method for optical detection, belonging to the technical field of automatic detection equipment for coal-fired power plants. Background Art

[0002] The quality of coal entering the power plant is related to the safety of the power plant operation. The method used to detect coal quality in the prior art is generally through optical detection technology. However, most of the air-powder tube online sampling devices suitable for optical detection technology in the prior art have the following problems:

[0003] 1. The powder extraction speed is slow and the timeliness is poor;

[0004] Second, it is impossible to directly judge whether the sampling and sample arrangement are successful, and the conformity between the sample and the main pipeline is not good (that is, the consistency between the sample being tested and the coal powder flowing in the main pipeline at a similar time is not good. The best case is that at the same time, the sample being tested and the sample in the pipeline are from the same batch of materials.);

[0005] 3. During the sampling process, the sample is severely adsorbed to the wall, which affects the sample update and the conformity between the sample and the main pipeline is poor;

[0006] 4. The sample to be tested is not statically isolated from the main pipeline and will be disturbed by external factors such as airflow, affecting the operation of the external detector;

[0007] 5. There is no physical isolation between the sampling chamber and the main pipeline. During the maintenance and replacement of key components such as the bottom optical lens, it is easy to cause air powder leakage from the main pipeline and contaminate the equipment;

[0008] 6. When the sampling device is working, it is impossible to view the internal situation of the cavity in real time, and the sampling device is in a black box state.

[0009] Therefore, there is an urgent need for an online coal quality detection platform and detection method for an air-powder tube suitable for optical detection to solve the above-mentioned problems existing in the existing online sampling devices. Summary of the invention

[0010] The present invention aims to solve the above-mentioned technical problems and further provides an online detection platform and method for optical detection of coal quality through an air-powder pipe.

[0011] The technical solution adopted by the present invention to solve the above technical problems is:

[0012] An air-powder pipe coal quality online detection platform for optical detection includes a sampling tube, an upper air seat, an upper base, a pneumatic butterfly valve, a pedestal, a lower base, an optical lens, a temperature measuring device and a group of incident light detectors, wherein the upper base, the pneumatic butterfly valve, the pedestal and the lower base are connected in sequence from top to bottom.

[0013] The upper air seat is installed in the upper base and forms an air distribution cavity with the upper base. The lower part of the upper air seat is provided with a plurality of air distribution holes along its circumference. The upper base is provided with a first air inlet hole, which is connected with the plurality of air distribution holes through the air distribution cavity.

[0014] The lower part of the sampling tube is inserted into the upper part of the upper air seat and is connected to the pneumatic butterfly valve through the upper air seat.

[0015] A detection through hole is vertically opened in the lower base, the optical lens is located directly below the detection through hole and is sealed and fixed to the lower base, the top of the detection through hole is connected to the pneumatic butterfly valve through the base, and the inside of the base and the detection through hole of the lower base form a cavity to be inspected.

[0016] Two second air inlet holes are oppositely opened on the lower base, and a group of opposite light detectors are fixedly mounted on both sides of the lower base, and detect the inside of the detection through hole above the optical lens through the two second air inlet holes.

[0017] The lower base is also provided with two third air inlet holes, and the air outlet ends of the two third air inlet holes are arranged opposite to each other.

[0018] The temperature measuring device is fixedly inserted on a side wall of the base and is used to detect and adjust the temperature in the cavity to be detected. The temperature measuring device is threadedly connected to the base.

[0019] Furthermore, two symmetrically arranged semi-flange structures are processed on the upper part of the upper air seat, and the two semi-flange structures are installed in the upper base and are arranged to hold the sampling tube tightly.

[0020] Furthermore, the top end of the sampling tube is arranged obliquely, and an upper liner is coaxially installed inside the sampling tube, and both ends of the inner wall of the upper liner are trumpet-shaped structures.

[0021] Furthermore, a base liner is installed in the base internal transition fit, the base liner is a cylindrical structure and an outer edge is processed at its bottom end, the base liner is fixed to the lower base through the outer edge, and a detection hole is opened on the side wall of the base liner.

[0022] Furthermore, an observation window is installed on a side of the base adjacent to the temperature measuring device.

[0023] Furthermore, a fourth air inlet hole is provided on the base, and the fourth air inlet hole is arranged opposite to the temperature measuring device.

[0024] Furthermore, the number of the first air inlet holes is two, the air outlet ends of the two first air inlet holes are arranged opposite to each other, and the two first air inlet holes are parallel to each other and staggered.

[0025] Furthermore, the two third air inlet holes are parallel to each other and staggered.

[0026] Furthermore, a group of incident light detectors are fixedly mounted on the lower base via two auxiliary bases, and each auxiliary base is provided with an L-shaped through hole, and the two second air inlets are connected to the external air source via the two L-shaped through holes.

[0027] A detection method of the above-mentioned air-powder pipe coal quality online detection platform for optical detection comprises the following steps:

[0028] Step 1: Clean the chamber:

[0029] In the initial state, the pneumatic butterfly valve is closed, and compressed air enters the air distribution chamber through the first air inlet hole on the upper base, and then is discharged through the annular air distribution holes on the upper air seat, and the accumulated coal powder above the pneumatic butterfly valve is preliminarily purged and cleaned by gas jet; the purge time is set, and when the purge is completed, the pneumatic butterfly valve is opened, and then compressed air is introduced into the first air inlet hole, and a part of the air flow is blown through the third air inlet hole on the lower base to the upper surface of the optical lens and the entire cavity to be inspected. The purge time is set, and when the purge is completed, the upper surface of the optical lens and the entire cavity to be inspected are blown through the L-shaped through hole on the auxiliary seat and the second air inlet hole on the lower base until the incident light detector feeds back a signal of no obstruction.

[0030] Step 2: Powder extraction operation:

[0031] The air-coal powder pipe works at the same time, and the coal powder flow hits the oblique opening at the top of the sampling tube. Part of the solid coal powder falls into the sampling tube under the action of gravity. At this time, the pneumatic butterfly valve is opened, and the coal powder then falls to the upper surface of the optical lens; after the incident light detector detects the light-shielding object, it sends a signal that the coal powder has been obtained; the pneumatic butterfly valve is closed to isolate the obtained coal powder from the air-coal powder pipe; the objective lens of the optical analysis instrument is placed on the lower surface of the outer surface of the optical lens, and the coal powder is scanned through the optical lens to obtain the required optical signal; in this process, the temperature in the cavity to be inspected is detected by the temperature measuring device and the optical analysis is temperature compensated;

[0032] Step 3: Powder discharge operation:

[0033] After the detection is completed, the compressed air enters the annular air distribution cavity through the first air inlet hole, and is discharged through a number of air distribution holes arranged in a ring, and the accumulated coal powder above the pneumatic butterfly valve is preliminarily purged and cleaned by gas jet; the purging time is set, and when the purging is completed, the pneumatic butterfly valve is opened, and then the compressed air is turned on, and a part of the airflow is blown through the third air inlet hole on the lower base to the upper surface of the optical lens and the entire cavity to be inspected, and the other part is blown through the fourth air inlet hole on the base to the inner surface of the observation window and the entire cavity to be inspected; the purging time is set, and when the purging is completed, the compressed air is turned on, and the airflow passes through the L-shaped through hole and the second air inlet hole to blow the upper surface of the optical lens and the entire cavity to be inspected until the incident light detector feedbacks a signal that there is no obstruction; then the pneumatic butterfly valve is closed.

[0034] Compared with the prior art, the present invention has the following effects:

[0035] By setting up a reflected light detector, the detection platform can have the function of detecting whether the coal powder is taken and discharged in place, which is beneficial to ensure the authenticity of the sample.

[0036] Before testing, by setting up a through-light detector, it is possible to detect whether samples of required thickness are accumulated in the cavity to be tested; after the test is completed, by setting up a through-light detector, it is possible to verify whether the tested samples in the cavity to be tested are completely cleaned.

[0037] The pneumatic butterfly valve serves as an isolating switch device between the powder taking chamber and the chamber to be inspected, and can timely connect and isolate the powder taking chamber and the chamber to be inspected. During external inspection, by closing the pneumatic butterfly valve, the sample in the chamber to be inspected is in a relatively isolated state, which is conducive to improving the inspection accuracy.

[0038] In addition, when the pneumatic butterfly valve is closed, the cavity to be inspected and the main pipeline can be completely isolated, which facilitates the maintenance and replacement of key components such as optical lenses inside the cavity to be inspected.

[0039] The online detection platform of the present invention can realize rapid sampling, and at the same time, through the setting of the pneumatic butterfly valve, rapid sample arrangement can be realized, and the accuracy of the sample can be guaranteed, so that the sample detection environment is isolated and anti-interference. The various components in the entire online detection platform are connected by bolts, which is convenient for disassembly and maintenance. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] Figure 1 It is a schematic diagram of a first three-dimensional structure of the online detection platform of the present invention;

[0041] Figure 2 It is a schematic diagram of the second structure of the online detection platform of the present invention;

[0042] Figure 3 It is a third three-dimensional structural schematic diagram of the online detection platform of the present invention;

[0043] Figure 4 is a fourth three-dimensional structural schematic diagram of the online detection platform of the present invention;

[0044] Figure 5 It is a main cross-sectional schematic diagram of the online detection platform of the present invention;

[0045] Figure 6 Schematic diagram of the three-dimensional structure of the sampling tube;

[0046] Figure 7 is a schematic diagram of a first three-dimensional structure of an upper liner;

[0047] Figure 8 is a schematic diagram of a second three-dimensional structure of the upper liner;

[0048] Fig. 9 It is a fifth three-dimensional structural schematic diagram of the online detection platform of the present invention (the sampling tube, the upper liner and the upper base are not shown);

[0049] Fig.10 It is a three-dimensional structural schematic diagram of a pneumatic butterfly valve;

[0050] Fig.11 is a perspective schematic diagram of the upper base;

[0051] Fig.12 is a schematic diagram of the three-dimensional structure of the base;

[0052] Fig.13 is a schematic diagram of a first three-dimensional structure of a base lining;

[0053] Fig.14 is a schematic diagram of a second three-dimensional structure of the base lining;

[0054] Fig.15 is a perspective schematic diagram of the lower base;

[0055] Fig.16 Schematic diagram of the three-dimensional structure of the upper air seat.

[0056] In the figure:

[0057] 1. Sampling tube; 2. Upper air seat; 2-1. Air equalization hole; 3. Upper base; 3-1. First air inlet hole; 4. Pneumatic butterfly valve; 5. Base; 5-1. Fourth air inlet hole; 6. Lower base; 6-1. Detection through hole; 6-2. Second air inlet hole; 6-3. Third air inlet hole; 7. Optical lens; 8. Temperature measuring device; 9. Optical detector; 10. Upper liner tube; 11. Base lining; 11-1. Detection hole; 12. Observation window; 13. Auxiliary seat; 13-1. L-shaped through hole; 14. Air equalization cavity. DETAILED DESCRIPTION

[0058] Specific implementation method 1: Combination Figures 1 to 16 The present embodiment is described to further describe the present invention in detail. It is understood that the specific embodiments described herein are only used to explain the present invention, but not to limit the present invention. It should also be noted that, for ease of description, only parts related to the present invention are shown in the drawings, not all structures.

[0059] In the description of the present invention, unless otherwise clearly specified and limited, the terms "connected", "connected", and "fixed" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood in specific circumstances.

[0060] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" or "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0061] In the description of this embodiment, the terms "upper", "lower", "left", "right" and other directions or positional relationships are based on the directions or positional relationships shown in the drawings, and are only for the convenience of description and simplified operation, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as limiting the present invention. In addition, the terms "first" and "second" are only used to distinguish in the description and have no special meaning.

[0062] An air-powder pipe coal quality online detection platform for optical detection comprises a sampling tube 1, an upper air seat 2, an upper base 3, a pneumatic butterfly valve 4, a base 5, a lower base 6, an optical lens 7, a temperature measuring device 8 and a group of incident light detectors 9, wherein the upper base 3, the pneumatic butterfly valve 4, the base 5 and the lower base 6 are connected in sequence from top to bottom.

[0063] The upper air seat 2 is installed in the upper base 3 and forms an air distribution cavity 14 with the upper base 3. The lower part of the upper air seat 2 is provided with a plurality of air distribution holes 2-1 along its circumference. The upper base 3 is provided with a first air inlet hole 3-1, which is connected with the plurality of air distribution holes 2-1 through the air distribution cavity 14.

[0064] The lower part of the sampling tube 1 is inserted into the upper part of the upper air seat 2 and is connected to the pneumatic butterfly valve 4 through the upper air seat 2.

[0065] A detection through hole 6-1 is vertically opened in the lower base 6, and the optical lens 7 is located directly below the detection through hole 6-1 and is sealed and fixed to the lower base 6. The top of the detection through hole 6-1 is connected to the pneumatic butterfly valve 4 through the base 5, and the inside of the base 5 and the detection through hole 6-1 of the lower base 6 form a cavity to be inspected.

[0066] Two second air inlet holes 6-2 are provided on the lower base 6, and a group of incident light detectors 9 are fixedly mounted on both sides of the lower base 6, and detect the inside of the detection through hole 6-1 above the optical lens 7 through the two second air inlet holes 6-2.

[0067] The lower base 6 is also provided with two third air inlet holes 6-3, and the air outlet ends of the two third air inlet holes 6-3 are arranged opposite to each other.

[0068] The temperature measuring device 8 is fixedly inserted on a side wall of the base 5 and is used to detect and adjust the temperature in the cavity to be tested. The temperature measuring device 8 is threadedly connected to the base 5 .

[0069] The base 5, the pneumatic butterfly valve 4 and the upper base 3 are fixedly connected from bottom to top in sequence by a plurality of bolts. The number of the bolts may be four and evenly distributed along the circumference of the upper base 3. In order to facilitate the installation of the bolts, an ear plate may be fixedly provided on the outer side of the pneumatic butterfly valve 4. Figure 1 to Figure 4 Only one set of bolts is shown.

[0070] During use, the sampling tube 1 is inserted into the sheath tube below the air-coal powder pipeline and connected to the sheath tube flange through the tops of several bolts. At this time, the sampling tube 1 has been extended into the air-coal powder pipeline and protrudes from the inner wall below. The top of the sampling tube 1 is an inclined structure, and it is ensured that the top bevel of the sampling tube 1 is in the windward direction.

[0071] The lower base 6 is fixedly mounted below the base 5 , and the interior of the base 5 and the detection through hole 6 - 1 of the lower base 6 form a cavity to be inspected.

[0072] By providing two third air inlet holes 6-3, the upper surface of the optical lens 7 and the interior of the cavity to be inspected can be purged.

[0073] A group of incident light detectors 9 are coaxially arranged. By arranging the incident light detectors 9, the detection platform has the function of detecting whether the coal powder is taken and discharged in place, which is conducive to ensuring the authenticity of the sample.

[0074] Before the test, by setting the incident light detector 9, it can be detected whether the sample of the required thickness is accumulated in the cavity to be tested; after the test, by setting the incident light detector 9, it can be verified whether the sample in the cavity to be tested is completely cleaned.

[0075] By setting up the second air inlet 6-2, not only can the presence of obstructions on the optical lens 7 and in the cavity to be inspected be detected by the incident light detector 9, but also the upper surface of the optical lens 7 and the inside of the cavity to be inspected can be purged by passing air flow into the second air inlet 6-2.

[0076] Specifically, air flow is introduced into the second air inlet hole 6-2 to purge the upper surface of the optical lens 7 and the inside of the cavity to be inspected, and then a group of incident light detectors 9 and two corresponding second air inlet holes 6-2 are used to detect whether there are any obstructions on the optical lens 7 and in the cavity to be inspected, and the incident light detector 9 provides real-time feedback of the presence / absence of an obstruction signal.

[0077] When the pneumatic butterfly valve 4 is in the open state, the sampling tube 1, the upper air seat 2, the pneumatic butterfly valve 4 and the base 5 are vertically connected and arranged opposite each other; when the pneumatic butterfly valve 4 is in the closed state, the sampling tube 1 and the upper air seat 2 form a powder collection chamber.

[0078] The pneumatic butterfly valve 4, the base and the upper base are fixedly connected by bolts.

[0079] The upper air seat 2 penetrates the upper base 3 from bottom to top, and the bottom of the upper air seat 2 is fixedly connected to the upper base 3 by fastening bolts.

[0080] The lower base 6 is fixedly connected to the base 5 by bolts.

[0081] The optical lens 7 is fixed to the bottom of the lower base 6 by means of a gland, a sealing ring and screws.

[0082] The inner wall of the detection through hole 6 - 1 is in a trumpet-shaped structure, forming a guide groove to facilitate the dust cleaning operation in the cavity.

[0083] The pneumatic butterfly valve 4 is used as an isolating switch device between the powder taking chamber and the chamber to be inspected, and can timely connect and isolate the powder taking chamber and the chamber to be inspected. During external inspection, by closing the pneumatic butterfly valve 4, the sample in the chamber to be inspected is in a relatively isolated state, which is conducive to improving the inspection accuracy.

[0084] In addition, when the pneumatic butterfly valve 4 is closed, the cavity to be inspected and the main pipeline can be completely isolated, so as to facilitate the maintenance and replacement of key components such as the optical lens 7 inside the cavity to be inspected.

[0085] The online detection platform of the present invention can realize rapid sampling, and at the same time, through the setting of the pneumatic butterfly valve 4, rapid sample arrangement can be realized, and the accuracy of the sample can be guaranteed, so that the sample detection environment is isolated and anti-interference. The various components in the entire online detection platform are connected by bolts, which is convenient for disassembly and maintenance.

[0086] The online detection platform of the present invention has no electrical components above 24 volts and has better safety.

[0087] The upper part of the upper gas seat 2 is processed with two symmetrically arranged semi-flange structures, which are installed in the upper base 3 and hold the sampling tube 1 tightly. Such a design facilitates the fixation of the lower part of the sampling tube 1. The two symmetrically arranged semi-flange structures are equivalent to the role of springs. The lower part of the sampling tube 1 is inserted between the two semi-flange structures, and the matching size requirements between the sampling tube 1 and the upper base 3 are smaller. The two sides of the upper base 3 are respectively installed with fixing bolts and support the two semi-flange structures on the upper gas seat 2 to ensure the clamping between the semi-flange structure and the sampling tube 1. In order to ensure the tightening effect, the number of fixing bolts can be four, which are arranged symmetrically in pairs.

[0088] The top end of the sampling tube 1 is obliquely arranged, and an upper liner 10 is coaxially installed inside the sampling tube 1, and the inner wall of the upper liner 10 has two ends in a trumpet-shaped structure. With such a design, the top end of the sampling tube 1 is obliquely arranged to form an oblique mouth, forming an outwardly extending collection structure that can actively obtain samples, which is conducive to quickly obtaining samples. The inner wall of the upper liner 10 has two ends in a trumpet-shaped structure, and its inner wall forms a low surface energy structure (that is, the inner wall of the upper liner 10 is provided with a surface coating, such as a Teflon coating or other non-stick material coating), making it difficult for the sample to be adsorbed. At the same time, the lower part of the inner wall of the upper liner 10 is set as a trumpet-shaped structure, and the air hole 2-1 is used as a near-wall air hole, and the airflow discharged from it is used to focus on blowing and cleaning the lower inner wall of the upper liner 10.

[0089] The base 5 is internally transitionally fitted with a base lining 11, which is a cylindrical structure and has an outer edge processed at its bottom. The base lining 11 is fixed to the lower base 6 through the outer edge, and a detection hole 11-1 is provided on the side wall of the base lining 11. With such a design, the base lining 11 is coaxially arranged with the outer edge. The internal cavity of the base lining 11 is a part of the cavity to be inspected, and the temperature measuring device 8 and the fourth air inlet are both arranged corresponding to the detection hole 11-1, which is convenient for measuring and controlling the temperature inside the cavity to be inspected, and at the same time, it is convenient for the external airflow to enter the cavity to be inspected through the fourth air inlet.

[0090] An observation window 12 is installed on a side of the base 5 adjacent to the temperature measuring device 8. This design makes it easy to observe the inside of the cavity to be inspected and analyze problems. At the same time, the observation window 12 is a detachable structure, which is convenient for device maintenance. The observation window 12 is preferably installed close to the temperature measuring device 8. The observation window 12 is fixed to a side of the base 5 by a gland, a sealing ring and screws.

[0091] The base 5 is provided with a fourth air inlet 5-1, and the fourth air inlet 5-1 is arranged opposite to the temperature measuring device 8. In this design, an external air source is connected through the fourth air inlet 5-1 to purge the inner surface of the observation window 12 and the entire cavity to be inspected.

[0092] There are two first air inlet holes 3-1, the air outlet ends of the two first air inlet holes 3-1 are arranged opposite to each other, and the two first air inlet holes 3-1 are arranged parallel to each other and staggered. Such a design makes the airflow discharged from the two first air inlet holes 3-1 form an upward swirl flow, thereby achieving a better purging effect.

[0093] The two third air inlet holes 6-3 are parallel to each other and staggered. Such a design enables the airflow discharged from the two third air inlet holes 6-3 to form an upward swirl flow, so that the cleaning of the cavity to be inspected is more thorough.

[0094] A group of incident light detectors 9 are fixedly mounted on the lower base 6 through two auxiliary seats 13, and each auxiliary seat 13 is provided with an L-shaped through hole 13-1. The two second air inlet holes 6-2 are connected to the external air source through the two L-shaped through holes 13-1. Such a design facilitates the introduction of air into the second air inlet holes 6-2. The auxiliary seat 13 is fixedly connected to the lower base 6 by bolts. The incident light detector 9 is mounted on the auxiliary seat 13 by threads.

[0095] A detection method of the above-mentioned air-powder pipe coal quality online detection platform for optical detection comprises the following steps:

[0096] Step 1: Clean the chamber:

[0097] In the initial state, the pneumatic butterfly valve 4 is closed, and the compressed air enters the air equalizing chamber 14 through the first air inlet hole 3-1 on the upper base 3, and then is discharged through the annularly arranged air equalizing holes 2-1 on the upper air seat 2, and the accumulated coal powder above the pneumatic butterfly valve 4 is preliminarily purged and cleaned by gas jet; the purging time is set, and when the purging is completed, the pneumatic butterfly valve 4 is opened, and then compressed air is introduced into the first air inlet hole 3-1, and a part of the airflow is passed through the third air inlet hole 6-3 on the lower base 6 to purge the upper surface of the optical lens 7 and the entire cavity to be inspected. The purging time is set, and when the purging is completed, the L-shaped through hole 13-1 on the auxiliary seat 13 and the second air inlet hole 6-2 on the lower base 6 are used to purge the upper surface of the optical lens 7 and the entire cavity to be inspected until the incident light detector 9 feeds back a signal of no obstruction.

[0098] With this design, most of the samples are blown away after one purge through the first air inlet, but some samples will be blown into the second air inlet. The channel corresponding to the second air inlet and the passage above the corresponding lens are key parts and need to be kept clean. Therefore, after one purge through the first air inlet, a second purge is performed through the second air inlet to ensure that the upper surface of the optical lens and the entire cavity to be inspected are clean.

[0099] Step 2: Powder extraction operation:

[0100] The air-coal powder pipe works at the same time, and the coal powder flow hits the oblique opening at the top of the sampling tube 1. Part of the solid coal powder falls into the sampling tube 1 under the action of gravity. At this time, the pneumatic butterfly valve 4 is opened, and the coal powder then falls to the upper surface of the optical lens 7; after the incident light detector 9 detects the light-shielding object, it sends a signal that the coal powder has been obtained; the pneumatic butterfly valve 4 is closed to isolate the obtained coal powder from the air-coal powder pipe; the objective lens of the optical analysis instrument is placed on the lower surface of the outer surface of the optical lens 7, and the coal powder is scanned through the optical lens 7 to obtain the required optical signal; in this process, the temperature condition in the cavity to be tested is detected by the temperature measuring device 8 and the temperature compensation is performed on the optical analysis;

[0101] Step 3: Powder discharge operation:

[0102] After the detection is completed, the compressed air enters the annular air distribution cavity 14 through the first air inlet 3-1, and is discharged through a plurality of annular air distribution holes 2-1, and the accumulated coal powder above the pneumatic butterfly valve 4 is initially purged and cleaned by gas jet; the purging time is set, and when the purging is completed, the pneumatic butterfly valve 4 is opened, and then the compressed air is opened, and a part of the airflow is purged through the third air inlet 6-3 on the lower base 6 to the upper surface of the optical lens 7 and the entire cavity to be inspected, and the other part is purged through the fourth air inlet 5-1 on the base 5 to the inner surface of the observation window 12 and the entire cavity to be inspected; the purging time is set, and when the purging is completed, the compressed air is opened, and the airflow is purged through the L-shaped through hole 13-1 and the second air inlet 6-2 to the upper surface of the optical lens 7 and the entire cavity to be inspected, until the incident light detector 9 feedbacks a signal of no obstruction; then the pneumatic butterfly valve 4 is closed. Whether the pneumatic butterfly valve 4 is switched on or off is fed back by the feedback device matched with the valve.

[0103] Specific implementation method 2: Combination Figures 1 to 16 To explain this implementation, open the compressed air of the first air inlet above the pneumatic butterfly valve, and the air flow will be purged through the air balancing hole for 3 to 5 seconds before closing; at the same time, open the pneumatic butterfly valve, open the third and fourth air inlets, purge for 3 to 5 seconds and then close, open the L-shaped through hole, the second air inlet and the incident light detector, and stop purging after the incident light detector feedbacks that the purge is clean; then start a new sampling, and close the pneumatic butterfly valve after the detection feedback that the powder is taken. The external optical detection probe of the optical lens starts the detection work until the detection is completed. At this point, a sampling and detection cycle is completed.

[0104] Other components and connection relationships are the same as those in the first specific implementation mode.

Claims

1. An air-powder pipe coal quality online detection platform for optical detection, characterized in that: The invention comprises a sampling tube (1), an upper air seat (2), an upper base (3), a pneumatic butterfly valve (4), a pedestal (5), a lower base (6), an optical lens (7), a temperature measuring device (8) and a group of incident light detectors (9), wherein the upper base (3), the pneumatic butterfly valve (4), the pedestal (5) and the lower base (6) are connected in sequence from top to bottom. The upper air seat (2) is installed in the upper base (3) and forms an air distribution cavity (14) between the upper air seat (2) and the upper base (3). The lower part of the upper air seat (2) is provided with a plurality of air distribution holes (2-1) along its circumference. The upper base (3) is provided with a first air inlet hole (3-1). The first air inlet hole (3-1) is connected to the plurality of air distribution holes (2-1) through the air distribution cavity (14). The lower part of the sampling tube (1) is inserted into the upper part of the upper air seat (2), and is connected to the pneumatic butterfly valve (4) through the upper air seat (2). A detection through hole (6-1) is vertically opened in the lower base (6); an optical lens (7) is located directly below the detection through hole (6-1) and is sealed and fixedly connected to the lower base (6); the top end of the detection through hole (6-1) is connected to the pneumatic butterfly valve (4) through the base (5); the interior of the base (5) and the detection through hole (6-1) of the lower base (6) form a cavity to be inspected. Two second air inlet holes (6-2) are provided on the lower base (6) in opposite directions. A group of incident light detectors (9) are fixedly mounted on two sides of the lower base (6) in opposite directions and detect the interior of the detection through hole (6-1) above the optical lens (7) through the two second air inlet holes (6-2). The lower base (6) is also provided with two third air inlet holes (6-3), and the air outlet ends of the two third air inlet holes (6-3) are arranged opposite to each other. The temperature measuring device (8) is fixedly inserted on a side wall of the base (5) and is used to detect and adjust the temperature in the cavity to be tested. The temperature measuring device (8) is threadedly connected to the base (5).

2. The air-powder tube coal quality online detection platform for optical detection according to claim 1 is characterized by: The upper part of the upper air seat (2) is processed with two symmetrically arranged semi-flange structures, and the two semi-flange structures are installed in the upper base (3) and are arranged to hold the sampling tube (1).

3. The air-powder tube coal quality online detection platform for optical detection according to claim 2 is characterized in that: The top end of the sampling tube (1) is arranged obliquely, and an upper liner (10) is coaxially installed inside the sampling tube (1), and the inner wall of the upper liner (10) has two ends with a trumpet-shaped structure.

4. The air-powder tube coal quality online detection platform for optical detection according to claim 2 or 3, characterized in that: The base (5) is internally transitionally fitted with a base lining (11), the base lining (11) being a cylindrical structure and having an outer edge processed at its bottom end, the base lining (11) being fixedly mounted on the lower base (6) via the outer edge, and a detection hole (11-1) being provided on a side wall of the base lining (11).

5. The air-powder tube coal quality online detection platform for optical detection according to claim 4 is characterized in that: An observation window (12) is installed on a side surface of the base (5) adjacent to the temperature measuring device (8).

6. The air-powder tube coal quality online detection platform for optical detection according to claim 2, 3 or 5, characterized in that: The base (5) is provided with a fourth air inlet hole (5-1), and the fourth air inlet hole (5-1) is arranged opposite to the temperature measuring device (8).

7. The air-powder tube coal quality online detection platform for optical detection according to claim 6 is characterized by: The number of the first air inlet holes (3-1) is two, the air outlet ends of the two first air inlet holes (3-1) are arranged opposite to each other, and the two first air inlet holes (3-1) are parallel to each other and arranged in a staggered manner.

8. The air-powder tube coal quality online detection platform for optical detection according to claim 2, 3 or 5, characterized in that: The two third air inlet holes (6-3) are parallel to each other and arranged in a staggered manner.

9. The air-powder tube coal quality online detection platform for optical detection according to claim 6 is characterized by: A group of incident light detectors (9) are fixedly mounted on the lower base (6) via two auxiliary seats (13), and each auxiliary seat (13) is provided with an L-shaped through hole (13-1). The two second air inlet holes (6-2) are connected to an external air source via the two L-shaped through holes (13-1).

10. A detection method for an air-powder tube coal quality online detection platform for optical detection as claimed in any one of claims 1 to 9, characterized in that: The steps include: Step 1: Clean the chamber: In the initial state, the pneumatic butterfly valve (4) is closed, and compressed air enters the air distribution chamber (14) through the first air inlet hole (3-1) on the upper base (3), and is then discharged through the annularly arranged air distribution holes (2-1) on the upper air seat (2), and the accumulated coal powder above the pneumatic butterfly valve (4) is preliminarily purged and cleaned by gas jet; the purging time is set, and when the purging is completed, the pneumatic butterfly valve (4) is opened, and then compressed air is introduced into the first air inlet hole (3-1), and a part of the air flow is passed through the third air inlet hole (6-3) on the lower base (6) to purge the upper surface of the optical lens (7) and the entire cavity to be inspected; the purging time is set, and when the purging is completed, the upper surface of the optical lens (7) and the entire cavity to be inspected are purged through the L-shaped through hole (13-1) on the auxiliary seat (13) and the second air inlet hole (6-2) on the lower base (6), until the incident light detector (9) feeds back a signal of no obstruction. Step 2: Powder extraction operation: The air and coal powder pipes work simultaneously, and the coal powder flow hits the inclined opening at the top of the sampling pipe (1), and part of the solid coal powder falls into the sampling pipe (1) under the action of gravity. At this time, the pneumatic butterfly valve (4) is opened, and the coal powder then falls onto the upper surface of the optical lens (7); after the incident light detector (9) detects the light blocking object, it sends a signal indicating that the coal powder has been obtained; the pneumatic butterfly valve (4) is closed to isolate the obtained coal powder from the air and coal powder pipe; The objective lens of the optical analysis instrument is placed on the lower surface of the outer portion of the optical lens (7), and the coal powder is irradiated and scanned through the optical lens (7) to obtain the required optical signal; during this process, the temperature condition in the cavity to be tested is detected by the temperature measuring device (8) and temperature compensation is performed on the optical analysis; Step 3: Powder discharge operation: After the detection is completed, the compressed air enters the annular air distribution chamber (14) through the first air inlet hole (3-1), and is discharged through a plurality of annularly arranged air distribution holes (2-1), and the accumulated coal powder above the pneumatic butterfly valve (4) is initially purged and cleaned by gas jet; The purge time is set. When the purge is completed, the pneumatic butterfly valve (4) is opened, and then the compressed air is opened. A part of the airflow passes through the third air inlet hole (6-3) on the lower base (6) to purge the upper surface of the optical lens (7) and the entire cavity to be inspected, and the other part passes through the fourth air inlet hole (5-1) on the base (5) to purge the inner surface of the observation window (12) and the entire cavity to be inspected; the purge time is set. When the purge is completed, the compressed air is opened. The airflow passes through the L-shaped through hole (13-1) and the second air inlet hole (6-2) to purge the upper surface of the optical lens (7) and the entire cavity to be inspected until the incident light detector (9) feeds back a signal that there is no obstruction; and then the pneumatic butterfly valve (4) is closed.

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