On-line monitoring device for air powder of fan coal mill

Abstract

The invention relates to a fan coal mill wind powder on-line monitoring device, which comprises a wind powder pipeline and electrostatic detection sensors, and is characterized in that the two electrostatic detection sensors with the same characteristics are sequentially arranged on the wind powder pipeline at intervals along the extension direction of the wind powder pipeline, and each electrostatic detection sensor comprises a mounting shell, a ceramic insulating sleeve, a probe and a locking piece, the installation shell is used for being installed in an installation hole of a wind powder pipeline, the probe is arranged in the installation shell through the ceramic insulation sleeve, the end, away from the ceramic insulation sleeve, of the probe extends into the wind powder pipeline, the end, located in the installation shell, of the probe is connected with a cable, and the locking piece is used for locking and fixing the cable to the installation shell. According to the fan coal mill air powder online monitoring device, high-temperature damage and vibration damage of the static detection sensor can be effectively reduced, the service life of the static detection sensor is prolonged, the reliability and the detection accuracy of the static detection sensor are improved, and then the reliability and the detection accuracy of the whole fan coal mill air powder online monitoring device are guaranteed.

Description

Technical Field

[0001] The present invention relates to the technical field of thermal power generation equipment, and particularly to an online monitoring device for air powder in a fan mill. Background Art

[0002] The boiler is one of the three main equipment in a thermal power plant, and its safe and efficient operation is of great significance to the operation of the entire power plant. Therefore, in the process of boiler operation, it is necessary to monitor the combustion condition of the boiler in real time and optimize the adjustment according to the monitoring value, which is an essential means to realize the optimized combustion of the boiler. One of the main monitoring means is to measure the concentration and wind speed of pulverized coal in the pulverized coal conveying pipeline in real time online, so as to adjust the concentration and speed of the air-powder mixture in the pulverized coal conveying pipeline according to the combustion condition of the boiler.

[0003] At present, the monitoring of the concentration and speed of the air-powder mixture in the pulverized coal conveying pipeline relies on an electrostatic detection sensor. That is, during the process of coal blocks being ground and crushed into pulverized coal particles in the coal mill, they will collide, rub against each other and separate, and during the pneumatic conveying process of pulverized coal in the pulverized coal conveying pipeline, collisions, frictions and separations occur between the powder particles and between the powder particles and the inner wall of the pulverized coal conveying pipeline. The above-mentioned collision, friction and separation processes will cause the pulverized coal particles to carry a considerable amount of static charges, resulting in a certain electrostatic field generated by the pulverized coal particles. When the charged pulverized coal particles pass through the probe of the electrostatic detection sensor, an equal amount of induced charges is generated on the surface of the probe in the electrostatic field. When a large number of charged pulverized coal particles pass through the probe, an induced current is formed on the probe. The magnitude of the induced current is related to the mass flow rate of the pulverized coal flowing through the probe. Taking the induced current as the measurement signal and processing and analyzing this signal can obtain the pulverized coal concentration in the pulverized coal conveying pipeline.

[0004] Two electrostatic detection sensors with the same characteristics are installed at intervals along the extension direction of the pulverized coal conveying pipeline. When the pulverized coal particles pass through the pulverized coal conveying pipeline, the output signals of the two electrostatic detection sensors change. By processing and analyzing the two output signals, the pulverized coal flow rate in the pulverized coal conveying pipeline can be obtained.

[0005] In the actual operation process, the pulverized coal conveying pipeline has high temperature, large vibration and other conditions, which are likely to cause high-temperature damage to the electrostatic detection sensor, resulting in the shrinkage and falling off of internal parts, affecting the measurement accuracy. Summary of the Invention

[0006] The purpose of the present invention is to provide an online monitoring device for air powder in a fan mill to reduce the high-temperature damage and vibration damage of the electrostatic detection sensor, and improve the reliability and accuracy of the online monitoring device for air powder in the fan mill.

[0007] To achieve the above purpose, the present invention provides the following technical solutions:

[0008] An on-line monitoring device for pulverized coal and air in a fan mill, comprising:

[0009] A pulverized coal and air pipeline;

[0010] An electrostatic detection sensor. Two electrostatic detection sensors with the same characteristics are sequentially arranged at intervals along the extension direction of the pulverized coal and air pipeline on the pulverized coal and air pipeline. The electrostatic detection sensor includes a mounting housing, a ceramic insulating sleeve, a probe and a locking member. The mounting housing is used to be mounted on the mounting hole of the pulverized coal and air pipeline. The probe is arranged in the mounting housing through the ceramic insulating sleeve. One end of the probe away from the ceramic insulating sleeve extends into the pulverized coal and air pipeline. One end of the probe located in the mounting housing is connected to a cable. The locking member is used to lock and fix the cable to the mounting housing.

[0011] In an embodiment of the present application, the mounting housing includes:

[0012] A mounting base, the mounting base is detachably connected to the pulverized coal and air pipeline, and the ceramic insulating sleeve is arranged in the mounting base;

[0013] An armored heightening housing, the armored heightening housing is detachably mounted on the mounting base, and the locking member is detachably mounted on one end of the armored heightening housing away from the mounting base.

[0014] In an embodiment of the present application, the mounting base includes:

[0015] A base housing, one end of the base housing is provided with a first mounting portion, an outer peripheral surface of the first mounting portion is provided with a first external thread, the mounting hole is a threaded hole, and the base housing is threadedly mounted on the mounting hole through the first mounting portion. The other end of the base housing is provided with a second mounting portion, an inner peripheral surface of the second mounting portion is provided with a first internal thread, and a limiting structure is provided on an inner peripheral surface of the first mounting portion;

[0016] A base gland, the base gland is in threaded cooperation with the first internal thread so that the base gland is connected to the base housing. The base gland and the limiting structure clamp the ceramic insulating sleeve from two axial ends of the ceramic insulating sleeve to fix the ceramic insulating sleeve. The base gland is provided with a first through hole for the cable to pass through.

[0017] In an embodiment of the present application, the limiting structure is an annular limiting step surface, or the limiting structure includes a plurality of limiting bosses arranged at intervals in the circumferential direction.

[0018] In an embodiment of the present application, a second external thread is provided on the outer peripheral surface of the second mounting portion, and a second internal thread is provided on the inner peripheral surface of the end of the armored heightening housing away from the locking member. The armored heightening housing and the second mounting portion are connected by screw-thread engagement of the second external thread and the second internal thread.

[0019] In an embodiment of the present application, the base housing further includes a limiting annular boss. The first mounting portion and the second mounting portion are respectively disposed on two sides of the limiting annular boss, and the surface of the limiting annular boss away from the first mounting portion is in contact and cooperation with the armored heightening housing.

[0020] In an embodiment of the present application, a sealing structure is provided between the mounting housing and the air-powder pipeline.

[0021] In an embodiment of the present application, the sealing structure includes a high-temperature resistant sealing ring. A ring groove surrounding the first mounting portion is provided on the surface of the limiting annular boss away from the second mounting portion, and the high-temperature resistant sealing ring is partially embedded in the ring groove.

[0022] In an embodiment of the present application, a plurality of expansion and contraction joints are circumferentially spaced along the end of the armored heightening housing away from the mounting base, and a third external thread is provided on the outer peripheral surface of the end of the armored heightening housing away from the mounting base. The locking member is a screw sleeve, and the locking member is provided with a second through hole for the cable to pass through. The locking member is in screw-thread engagement with the third external thread, so that the end of the armored heightening housing away from the mounting base radially contracts to clamp and fix the cable.

[0023] In an embodiment of the present application, the cable is a coaxial cable. The central conductor of the cable is connected to the probe, and the shielding layer of the cable is connected to the mounting housing.

[0024] It can be seen from the above technical solutions that the present invention discloses an on-line air-powder monitoring device for a fan mill. The on-line air-powder monitoring device for a fan mill includes an air-powder pipeline and an electrostatic detection sensor. Among them, the air-powder pipeline is used to form a channel for pneumatically transporting pulverized coal particles. Two electrostatic detection sensors with the same characteristics are sequentially and spaced along the extension direction of the air-powder pipeline and disposed on the air-powder pipeline. The electrostatic detection sensor includes a mounting housing, a ceramic insulating sleeve, a probe, and a locking member. The mounting housing is used to be mounted in the mounting hole of the air-powder pipeline. The probe is disposed in the mounting housing through the ceramic insulating sleeve. One end of the probe away from the ceramic insulating sleeve extends into the air-powder pipeline. One end of the probe located in the mounting housing is connected to the cable, and the locking member is used to lock and fix the cable to the mounting housing.

[0025] In the electrostatic detection sensor of the above-mentioned online monitoring device for pulverized coal and air in a fan mill, a ceramic insulating sleeve with better high-temperature resistance is used to replace the original tetrafluoroethylene sleeve that is prone to creep at high temperatures. This can effectively prevent the sleeve from shrinking and falling off under high-temperature and vibration conditions, improve the service life and reliability of the electrostatic detection sensor. At the same time, the locking component can lock the cable to the installation housing, preventing the connection part between the cable and the probe from loosening under vibration, ensuring good contact between the cable and the probe, and guaranteeing the smooth transmission of the detection signal. It can be seen that by replacing the tetrafluoroethylene sleeve in the electrostatic detection sensor that is prone to creep at high temperatures with a ceramic insulating sleeve and fixing the cable through the locking component, the above-mentioned online monitoring device for pulverized coal and air in a fan mill can effectively reduce the high-temperature damage and vibration damage of the electrostatic detection sensor, improve the service life, reliability and detection accuracy of the electrostatic detection sensor, and further ensure the reliability and detection accuracy of the entire online monitoring device for pulverized coal and air in a fan mill. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on these drawings.

[0027] Figure 1 It is a cross-sectional view of the online monitoring device for pulverized coal and air in a fan mill provided by an embodiment of the present invention;

[0028] Figure 2 It is a cross-sectional view of the pulverized coal and air pipeline of the online monitoring device for pulverized coal and air in a fan mill provided by an embodiment of the present invention;

[0029] Figure 3 It is a partially enlarged cross-sectional view of the online monitoring device for pulverized coal and air in a fan mill provided by an embodiment of the present invention;

[0030] Figure 4 It is a cross-sectional view of the electrostatic detection sensor of the online monitoring device for pulverized coal and air in a fan mill provided by an embodiment of the present invention.

[0031] In the figure:

[0032] 100 is the pulverized coal and air pipeline; 110 is the installation hole; 120 is the installation boss;

[0033] 200 is the electrostatic detection sensor; 210 is the installation housing; 211 is the installation base; 2111 is the base housing; 2112 is the base gland; 212 is the armored heightening housing; 220 is the ceramic insulating sleeve; 230 is the probe; 240 is the locking component; 250 is the cable. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0034] The core of the present invention is to provide an on-line monitoring device for pulverized coal and air in a fan mill. The structural design of the on-line monitoring device for pulverized coal and air in the fan mill enables it to reduce the high-temperature damage and vibration damage of the electrostatic detection sensor, and improve the reliability and accuracy of the on-line monitoring device for pulverized coal and air in the fan mill.

[0035] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0036] Please refer to Figures 1 to 4 , an on-line monitoring device for pulverized coal and air in a fan mill is disclosed in the embodiments of the present invention. The on-line monitoring device for pulverized coal and air in the fan mill includes a pulverized coal and air pipeline and an electrostatic detection sensor.

[0037] Among them, the pulverized coal and air pipeline 100 is used to form a channel for pneumatically transporting pulverized coal particles, and is a circumferentially closed cylinder. As Figure 2 shown, two mounting holes 110 for mounting the electrostatic detection sensor 200 are arranged at intervals along the extension direction of the pulverized coal and air pipeline 100 on the pulverized coal and air pipeline 100. Two electrostatic detection sensors 200 with the same characteristics are arranged on the pulverized coal and air pipeline 100 at intervals in sequence along the extension direction of the pulverized coal and air pipeline 100.

[0038] The electrostatic detection sensor 200 includes a mounting housing 210, a ceramic insulating sleeve 220, a probe 230, and a locking member 240. The mounting housing 210 is used to be mounted in the mounting hole 110 of the pulverized coal and air pipeline 100. The mounting housing 210 is made of a metal material, provides a mounting position, support, and protection for the internal ceramic insulating sleeve 220 and probe 230, and can also play a certain shielding effect. The probe 230 is arranged in the mounting housing 210 through the ceramic insulating sleeve 220. One end of the probe 230 far from the ceramic insulating sleeve 220 extends into the pulverized coal and air pipeline 100. One end of the probe 230 located in the mounting housing 210 is connected to a cable 250. The locking member 240 is used to lock and fix the cable 250 to the mounting housing 210.

[0039] Compared with the prior art, in the electrostatic detection sensor 200 of the on-line monitoring device for pulverized coal-air mixture in the fan mill provided by the embodiment of the present application, a ceramic insulating sleeve 220 with better high-temperature resistance is used to replace the original tetrafluoroethylene sleeve that is prone to creep at high temperatures, which can effectively avoid the shrinkage and shedding of the sleeve under high temperature and vibration conditions, improve the service life and reliability of the electrostatic detection sensor 200. At the same time, the locking member 240 can lock the cable 250 to the installation housing 210, preventing the connection part of the cable 250 and the probe 230 from loosening under vibration, ensuring good contact between the cable 250 and the probe 230, and guaranteeing the smooth transmission of the detection signal. It can be seen that by replacing the tetrafluoroethylene sleeve that is prone to creep at high temperatures in the electrostatic detection sensor 200 with a ceramic insulating sleeve 220 and fixing the cable 250 through the locking member 240, the on-line monitoring device for pulverized coal-air mixture in the fan mill can effectively reduce the high-temperature damage and vibration damage of the electrostatic detection sensor 200, improve the service life, reliability and detection accuracy of the electrostatic detection sensor 200, and further ensure the reliability and detection accuracy of the entire on-line monitoring device for pulverized coal-air mixture in the fan mill.

[0040] As Figure 3 and Figure 4 shown, in an embodiment of the present application, the installation housing 210 includes an installation base 211 and an armored heightening housing 212. Among them, the installation base 211 is detachably connected to the pulverized coal-air pipeline 100, the ceramic insulating sleeve 220 is arranged in the installation base 211, the armored heightening housing 212 is detachably installed on the installation base 211, and the armored heightening housing 212 and the installation base 211 can be connected by a threaded connection method. The locking member 240 is detachably installed at one end of the armored heightening housing 212 away from the installation base 211. By means of the armored heightening housing 212, the overall height of the electrostatic detection sensor 200 can be increased, preventing the cable 250 from approaching the pulverized coal-air pipeline 100 with a higher temperature, increasing the high-temperature resistance of the electrostatic detection sensor 200, and enabling it to work stably in a high-temperature environment.

[0041] Specifically, as Figure 3 and Figure 4As shown in the above embodiments, the mounting base 211 includes a base housing 2111 and a base gland 2112. Among them, one end of the base housing 2111 is provided with a first mounting portion, and a first external thread is provided on the outer peripheral surface of the first mounting portion. The mounting hole 110 is a threaded hole. The base housing 2111 is threadedly mounted on the mounting hole 110 of the air powder pipeline 100 through the first mounting portion. The other end of the base housing 2111 is provided with a second mounting portion, and a first internal thread is provided on the inner peripheral surface of the second mounting portion. A limiting structure is provided on the inner peripheral surface of the first mounting portion. The base gland 2112 is in threaded cooperation with the first internal thread, so that the base gland 2112 is connected to the base housing 2111. At the same time, the base gland 2112 and the limiting structure clamp the ceramic insulating sleeve 220 from the axial two ends of the ceramic insulating sleeve 220 to fix the ceramic insulating sleeve 220. In this way, the ceramic insulating sleeve 220 can be effectively and stably fixed, and the problem of the ceramic insulating sleeve 220 falling off is eliminated. The base gland 2112 is provided with a first through hole for the cable 250 to pass through.

[0042] For the convenience of assembly, the diameter of the second mounting portion of the base housing 2111 is slightly larger than the outer diameter of the ceramic insulating sleeve 220 to facilitate loading the ceramic insulating sleeve 220 from the opening position of the second mounting portion. During assembly, first, the probe 230 connected to the cable 250 is installed on the ceramic insulating sleeve 220, and then the combination of the probe 230 and the ceramic insulating sleeve 220 is loaded into the base housing 2111, so that the ceramic insulating sleeve 220 is in contact and cooperation with the limiting structure. At the same time, part of the ceramic insulating sleeve 220 and the probe 230 passes through the opening of the first mounting portion of the base housing 2111. Then, the end of the cable 250 far from the probe 230 passes through the first through hole on the base gland 2112, and the base gland 2112 is installed on the base housing 2111 to complete the assembly of the mounting base 211.

[0043] After the assembly of the mounting base 211 is completed, the end of the cable 250 far from the probe 230 passes through the armored heightening housing 212 and the locking member 240 in sequence, and the armored heightening housing 212 is installed on the mounting base 211, and finally the locking member 240 is locked.

[0044] It should be noted that in the above embodiments, at least one of the base housing 2111 and the base gland 2112 is detachably connected to the armored heightening housing 212.

[0045] As Figure 3 and Figure 4 shown, in an embodiment of the present application, the limiting structure is an annular limiting step surface, or the limiting structure includes a plurality of limiting protrusions arranged at intervals in the circumferential direction.

[0046] For the convenience of installing the armored heightening housing 212 on the mounting base 211, in this application, a second external thread is provided on the outer peripheral surface of the second mounting portion, and a second internal thread is provided on the inner peripheral surface of the end of the armored heightening housing 212 away from the locking member 240. The armored heightening housing 212 and the second mounting portion are connected by screw-thread matching of the second external thread and the second internal thread.

[0047] As Figure 3 and Figure 4 shown, for the convenience of installing the mounting base 211, the armored heightening housing 212 and the air-powder pipeline 100, in an embodiment of this application, the base housing 2111 further includes a limiting annular boss. The first mounting portion and the second mounting portion are respectively arranged on both sides of the limiting annular boss. The outer diameter of the limiting annular boss is larger than the outer diameters of the first mounting portion and the second mounting portion, so that annular limiting surfaces are formed between the limiting annular boss and the first mounting portion and between the limiting annular boss and the second mounting portion. The surface of the side of the limiting annular boss away from the first mounting portion is in contact and cooperation with the armored heightening housing 212. At the same time, in order to limit the mounting position of the mounting base 211, as Figure 2 shown, a mounting boss 120 surrounding the mounting hole 110 is provided on the outer wall of the air-powder pipeline 100. The mounting boss 120 is coaxial with the mounting hole 110 and the mounting hole 110 extends through the mounting boss 120. The surface of the side of the limiting annular boss away from the second mounting portion is in contact and cooperation with the annular end face of the mounting boss 120.

[0048] Furthermore, in an embodiment of this application, a sealing structure is provided between the mounting housing 210 and the air-powder pipeline 100. Specifically, the sealing structure includes a high-temperature resistant sealing ring. A ring groove surrounding the first mounting portion is provided on the surface of the side of the limiting annular boss away from the second mounting portion. The high-temperature resistant sealing ring is partially embedded in the ring groove. When the mounting base 211 is mounted to be in contact with the limiting annular boss and the mounting boss 120, the limiting annular boss and the mounting boss 120 cooperate to squeeze the high-temperature resistant sealing ring, causing the high-temperature resistant sealing ring to undergo elastic deformation, thereby realizing the sealing between the mounting housing 210 and the air-powder pipeline 100.

[0049] To ensure the fixation of the cable 250 and reduce the vibration damage suffered by the cable 250, in an embodiment of this application, a plurality of expansion and contraction joints are arranged at intervals along the circumferential direction at the end of the armored heightening housing 212 away from the mounting base 211. A third external thread is provided on the outer peripheral surface of the end of the armored heightening housing 212 away from the mounting base 211. The locking member 240 is a screw sleeve. The locking member 240 is provided with a second through hole for the cable 250 to pass through. The locking member 240 is in screw-thread matching with the third external thread, so that the end of the armored heightening housing 212 away from the mounting base 211 radially contracts to clamp and fix the cable 250.

[0050] Of course, the locking member 240 can also adopt other structures. For example, the locking member 240 can adopt a hoop structure. By clamping the end of the armored heightening outer shell 212 away from the mounting base 211, the expansion and contraction joint is contracted, and the cable 250 is clamped.

[0051] To improve the anti-interference ability during signal transmission, as Figures 1 to 3 shown, in an embodiment of the present application, the cable 250 is a coaxial cable 250. The coaxial cable 250 can effectively shield external electromagnetic interference during transmission, ensuring the stability and high quality of the signal. The central conductor of the cable 250 is connected to the probe 230, and the shielding layer of the cable 250 is connected to the mounting outer shell 210.

[0052] It should be noted that the various embodiments in this specification are described in a progressive manner. Each embodiment focuses on the differences from other embodiments. The same or similar parts among the various embodiments can be referred to each other.

[0053] It should be understood that in the present application, if "system", "device", "unit" and / or "module" are used, they are only a method for distinguishing different components, elements, parts, portions or assemblies at different levels. However, if other words can achieve the same purpose, that word can be replaced by other expressions.

[0054] As shown in the present application and the claims, unless the context clearly indicates an exception, words such as "a", "an", "one" and / or "the" are not specifically singular and may also include the plural. Generally speaking, the terms "comprising" and "including" only indicate the inclusion of the clearly identified steps and elements, and these steps and elements do not constitute an exclusive list. The method or device may also include other steps or elements. An element defined by the statement "including one..." does not exclude the existence of another identical element in the process, method, commodity or device including the element.

[0055] Among them, in the description of the embodiments of the present application, unless otherwise specified, " / " means "or". For example, A / B can mean A or B; "and / or" herein is only a description of the association relationship of the associated objects, indicating that there can be three relationships. For example, A and / or B can mean: A exists alone, A and B exist simultaneously, and B exists alone. In addition, in the description of the embodiments of the present application, "a plurality" means two or more than two.

[0056] If a flowchart is used in this application, the flowchart is used to illustrate the operations performed by the system according to the embodiments of this application. It should be understood that the operations before or after may not necessarily be executed precisely in sequence. On the contrary, the steps may be processed in reverse order or simultaneously. At the same time, other operations may also be added to these processes, or one or several steps may be removed from these processes.

[0057] It should also be noted that in this text, terms such as "including", "comprising" or any other variants thereof are intended to cover non-exclusive inclusion, so that an article or device including a series of elements not only includes those elements, but also includes other elements not explicitly listed, or elements inherent to such article or device. Without further limitation, an element defined by the statement "including one..." does not exclude the existence of another identical element in the article or device including the above element.

[0058] Specific examples are used in this text to elaborate on the principles and implementation manners of the present invention. The description of the above embodiments is only used to help understand the core idea of the present invention. It should be pointed out that for those of ordinary skill in the art, without departing from the principle of the present invention, several improvements and modifications can be made to the present invention, and these improvements and modifications also fall within the protection scope of the claims of the present invention.

Claims

1. An on-line monitoring device for pulverized coal and air in a ball mill, characterized in that, Comprising: A pulverized coal pipeline (100); An electrostatic detection sensor (200), two of the electrostatic detection sensors (200) with the same characteristics are sequentially arranged at intervals along the extending direction of the pulverized coal pipeline (100) on the pulverized coal pipeline (100). The electrostatic detection sensor (200) includes a mounting housing (210), a ceramic insulating sleeve (220), a probe (230), and a locking member (240). The mounting housing (210) is used to be mounted on the mounting hole (110) of the pulverized coal pipeline (100). The probe (230) is arranged in the mounting housing (210) through the ceramic insulating sleeve (220). One end of the probe (230) away from the ceramic insulating sleeve (220) extends into the pulverized coal pipeline (100). One end of the probe (230) located in the mounting housing (210) is connected to a cable (250). The locking member (240) is used to lock and fix the cable (250) to the mounting housing (210).

2. The on-line monitoring device for air powder of a fan mill according to claim 1, characterized in that, The mounting housing (210) includes: A mounting base (211), the mounting base (211) is detachably connected to the pulverized coal pipeline (100), and the ceramic insulating sleeve (220) is arranged in the mounting base (211); An armored heightening housing (212), the armored heightening housing (212) is detachably mounted on the mounting base (211), and the locking member (240) is detachably mounted on one end of the armored heightening housing (212) away from the mounting base (211).

3. The on-line monitoring device for pulverized coal and air in a fan mill according to claim 2, wherein The mounting base (211) includes: A base housing (2111), one end of the base housing (2111) is provided with a first mounting portion, an outer peripheral surface of the first mounting portion is provided with a first external thread, the mounting hole (110) is a threaded hole, and the base housing (2111) is threadedly mounted on the mounting hole (110) through the first mounting portion. The other end of the base housing (2111) is provided with a second mounting portion, an inner peripheral surface of the second mounting portion is provided with a first internal thread, and an inner peripheral surface of the first mounting portion is provided with a limiting structure; A base gland (2112), the base gland (2112) is in threaded cooperation with the first internal thread so that the base gland (2112) is connected to the base housing (2111). The base gland (2112) and the limiting structure clamp the ceramic insulating sleeve (220) from the axial two ends of the ceramic insulating sleeve (220) to fix the ceramic insulating sleeve (220). The base gland (2112) is provided with a first through hole for the cable (250) to pass through.

4. The on-line monitoring device for pulverized coal-air mixture of a fan mill according to claim 3, characterized in that, The limiting structure is an annular limiting step surface, or the limiting structure includes a plurality of limiting bosses arranged at intervals along the circumferential direction.

5. The on-line monitoring device for pulverized coal-air mixture of a fan mill according to claim 3, characterized in that, The outer peripheral surface of the second mounting portion is provided with a second external thread, and the inner peripheral surface of one end of the armored heightening housing (212) away from the locking member (240) is provided with a second internal thread. The armored heightening housing (212) and the second mounting portion are threadedly connected through the second external thread and the second internal thread.

6. The on-line monitoring device for pulverized coal and air in a fan mill according to claim 5, characterized in that The base housing (2111) further includes a limiting annular boss. The first mounting portion and the second mounting portion are respectively arranged on both sides of the limiting annular boss, and the surface of one side of the limiting annular boss away from the first mounting portion is in contact and cooperation with the armored heightening housing (212).

7. The on-line monitoring device for pulverized coal-air mixture of a fan mill according to claim 6, characterized in that, A sealing structure is provided between the mounting housing (210) and the air powder pipeline (100).

8. The on-line monitoring device for pulverized coal-air mixture of the fan mill according to claim 7, characterized in that, The sealing structure includes a high-temperature resistant sealing ring. A ring groove surrounding the first mounting portion is provided on the surface of one side of the limiting annular boss away from the second mounting portion, and the high-temperature resistant sealing ring is partially embedded in the ring groove.

9. The on-line monitoring device for pulverized coal-air mixture of a fan mill according to any one of claims 2-8, characterized in that A plurality of expansion and contraction joints are arranged at intervals along the circumferential direction at one end of the armored heightening housing (212) away from the mounting base (211). The outer peripheral surface of one end of the armored heightening housing (212) away from the mounting base (211) is provided with a third external thread. The locking member (240) is a screw sleeve. The locking member (240) is provided with a second through hole for the cable (250) to pass through. The locking member (240) is in threaded cooperation with the third external thread so that one end of the armored heightening housing (212) away from the mounting base (211) radially contracts to clamp and fix the cable (250).

10. The on-line monitoring device for pulverized coal-air mixture of a fan mill according to any one of claims 1-8, characterized in that, The cable (250) is a coaxial cable (250). The central conductor of the cable (250) is connected to the probe (230), and the shielding layer of the cable (250) is connected to the mounting housing (210).

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