Sampling device for coal mill and sampling method

Abstract

The application discloses a sampling device for a coal mill and a sampling method. The sampling device for the coal mill comprises a shell, a sampling pipe, a first pipe and a friction member. The sampling pipe is movably arranged in the shell along an axial direction. The sampling pipe has a sampling end and a mounting end in the axial direction. The mounting end is adapted to be communicated with a pipeline so that the sampling pipe can be sampled or purged. The first pipe is arranged in the shell. One end of the first pipe is oppositely arranged with the sampling end in the inner-outer direction so that dust on the sampling end can be blown out of the sampling pipe through the first pipe. The friction member is arranged in the shell. The sampling end of the sampling pipe is arranged in the friction member. When the sampling pipe moves in the shell, the friction member can clean dust on the sampling end. The sampling device for the coal mill has the advantages of not being easily blocked, simple structure, long service life and the like.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of flue gas component detection, in particular, a sampling device for a coal mill and a sampling method. BACKGROUND

[0002] The coal mill is the main auxiliary equipment of the coal-fired unit of the coal pulverizing system of the thermal power plant, and is a power mechanical device for grinding raw coal to meet the suspended combustion fineness of the boiler. During the operation of the coal mill, the coal is in contact with the air to produce CO gas and carbon through oxidation reaction, and the heat generated at the same time causes the insufficient combustion of the gas inside the coal mill, thereby generating a large amount of CO gas. The increase in the concentration of the CO gas reduces the ignition point of the combustible material in the coal mill, thereby increasing the risk of fire or explosion of the coal mill.

[0003] In the related art, the sampling device for the coal mill is prone to blockage, has a large amount of maintenance work, and has a high cost. SUMMARY

[0004] The present application is based on the discovery and understanding of the inventors of the following facts and problems:

[0005] In the related art, the filter core cleaning method adopts a combination of internal blowing and external blowing, and cannot solve the problem of blockage of the filter core of the sampling device for the coal mill. The coal mill outlet sprays a large amount of high-temperature and high-humidity coal powder under positive pressure, and the coal powder is easy to form a water-cement mixture in this environment, causing the outer wall of the filter core of the sampling device to be blocked, and the staff needs to frequently maintain it, which is laborious and does not have the function of convenient cleaning and dredging.

[0006] The present application aims to at least solve one of the technical problems in the related art to some extent. To this end, an embodiment of the present application proposes a sampling device for a coal mill.

[0007] The sampling device for the coal mill of the embodiment of the present application comprises: a shell; a sampling pipe movably arranged in the shell along the axial direction thereof, the sampling pipe having a sampling end and a mounting end in the axial direction thereof, the mounting end being adapted to communicate with a pipeline so that the sampling pipe performs sampling or purges the sampling pipe; a first pipe arranged in the shell, and one end of the first pipe being arranged opposite to the sampling end in the inner-outer direction so as to blow the dust of the sampling end out of the sampling pipe through the first pipe; and a rubbing member arranged in the shell, the sampling end of the sampling pipe being arranged in the rubbing member, and the sampling pipe moving in the shell so that the rubbing member cleans the dust on the sampling end.

[0008] The sampling device for the coal mill of the embodiment of the present application is provided with the sampling pipe, the first pipe and the rubbing member, so that the sampling end is cleaned by the mechanical and purging methods at the same time, the blockage of the sampling device during use is prevented, and the use efficiency of the sampling device is ensured.

[0009] In some embodiments, the coal mill sampling device further comprises a driving assembly connected with the sampling tube to move the sampling tube in the housing.

[0010] In some embodiments, the driving assembly comprises a support rod arranged in the housing, a first plate and a second plate arranged on the support rod, the first plate being located between the second plate and the friction member, the second plate being movable relative to the support rod in the axial direction of the support rod, the sampling tube being connected with the first plate and the second plate to move the sampling tube by the second plate, a first bellows and a second bellows, the first bellows being sleeved in the second bellows, the outer circumferential surface of the first bellows and the inner circumferential surface of the second bellows being spaced apart in the radial direction of the first tube to form a chamber, the second bellows being in communication with the sampling tube, one end of the first bellows and one end of the second bellows being connected with the second plate, the other end of the first bellows and the other end of the second bellows being connected with the housing.

[0011] In some embodiments, the coal mill sampling device further comprises a resilient member arranged on the sampling tube and located between the first plate and the second plate, the resilient member having an elastic force to drive the second plate to move away from the first plate.

[0012] In some embodiments, the driving assembly has a first state and a second state, in the first state, the first bellows and the second bellows are contracted to drive the second plate to move away from the first plate, and the chamber is in communication with the first tube to flow the gas in the chamber into the first tube to purge the sampling end of the sampling tube, in the second state, the first bellows and the second bellows are elongated to drive the second plate to move adjacent to the first plate.

[0013] In some embodiments, the support rod comprises a first segment and a second segment connected with each other, one end of the second segment being arranged in the housing, the first plate and the second plate being arranged on the second segment, and the second plate being movable relative to the support rod in the axial direction of the second segment, in the projection plane orthogonal to the axial direction of the support rod, the projection of the first segment is located in the second segment, in the first state, the second plate abuts against one end of the first segment adjacent to the second segment.

[0014] In some embodiments, the coal mill sampling device further comprises a second tube arranged at one end of the first plate away from the second plate, the rubbing member is arranged in the first tube and located at one end of the first tube away from the first plate, and the sampling tube is arranged in the first tube.

[0015] In some embodiments, the second tube is provided with a plurality of grooves at one end thereof away from the first plate, the grooves extend through the second tube in the inner-outer direction and along the axial direction of the second tube, and the plurality of grooves are arranged at intervals along the circumferential direction of the second tube.

[0016] In some embodiments, the rubbing member is provided with a through hole extending through the rubbing member, the through hole is arranged opposite to the grooves in the inner-outer direction, and the other end of the first tube is arranged in the through hole and opposite to the sampling tube in the inner-outer direction.

[0017] The coal mill sampling method of the embodiment of the present application utilizes the coal mill sampling device of any one of the above embodiments, and comprises the following steps: S1: driving the sampling tube to move along the axial direction thereof, so that the sampling end of the sampling tube moves opposite to the rubbing member to clean the dust on the sampling end of the sampling tube; S2: ventilating the sampling tube and the first tube to purge the inside of the sampling tube and the outside of the sampling tube; and S3: after the cleaning, sampling the coal mill by using the sampling tube. BRIEF DESCRIPTION OF DRAWINGS

[0018] Figure 1 is a structural schematic view of the coal mill sampling device of the embodiment of the present application.

[0019] Figure 2 is a sectional view of the first state of the driving assembly of the coal mill sampling device of the embodiment of the present application.

[0020] Figure 3 is a sectional view of the second state of the driving assembly of the coal mill sampling device of the embodiment of the present application.

[0021] Figure 4 is a structural schematic view of the coal mill sampling device of the embodiment of the present application without the shell.

[0022] Figure 5 is a structural schematic view of the sampling tube of the coal mill sampling device of the embodiment of the present application.

[0023] Figure 6 is a structural schematic view of the cleaning system of the coal mill sampling device of the embodiment of the present application.

[0024] REFERENCE SIGNS:

[0025] the coal mill sampling device 100;

[0026] Housing 1; right end cover 11;

[0027] Sampling pipe 2; sampling end 21; mounting end 22;

[0028] First pipe 3;

[0029] Friction member 4; through hole;

[0030] Drive assembly 5; support rod 51; first section 511; second section 512; first plate 52; second plate 53; first bellow 54; second bellow 55; cavity 551; elastic member 56;

[0031] Second pipe 6; groove 61;

[0032] Air source 7; first electromagnetic valve 8; second electromagnetic valve 9; third electromagnetic valve 10; three-position two-way electromagnetic valve 101; one-way valve 102. DETAILED DESCRIPTION

[0033] Embodiments of the present application are described in detail below with reference to examples shown in the attached drawings. The embodiments described below by reference to the drawings are exemplary and are intended to explain the present application, and cannot be understood as limiting the present application.

[0034] A sampling device for a coal mill according to an embodiment of the present application is described below with reference to the drawings.

[0035] As Figures 1-5 shown, the sampling device for a coal mill according to an embodiment of the present application includes a housing 1, a sampling pipe 2, a first pipe 3, and a friction member 4.

[0036] The sampling pipe 2 is movably arranged in the housing 1 along its axial direction (left-right direction as Figure 1 shown), and the sampling pipe 2 has a sampling end 21 and a mounting end 22 in its axial direction, and the mounting end 22 is adapted to be communicated with a pipe for sampling or purging the sampling pipe 2. Specifically, as Figure 1 shown, the left end of the sampling pipe 2 is provided with a filter screen as the sampling end 21, and the right end of the sampling pipe 2 is provided with a flange as the mounting end 22, and the flange can be communicated with an external pipe, and the sampling pipe 2 can be purged by blowing gas into the sampling pipe 2 through the pipe, so that the accumulated dust in the sampling pipe 2 is blown out from the sampling end 21, or when the sampling pipe 2 is sampling, the pipe is connected with a detection device, so that the device in the sampling pipe 2 is sampled.

[0037] The first pipe 3 is arranged in the shell 1, and one end of the first pipe 3 is arranged opposite to the sampling end 21 in the inner-outer direction, and is used for blowing the dust of the sampling end 21 out of the sampling pipe 2 through the first pipe 3. Specifically, the first pipe 3 is a blowing pipe, the first pipe 3 is arranged in the shell 1, and the left end of the first pipe 3 is opposite to the sampling end 21, and the right end of the first pipe 3 is communicated with the pipeline, when it is needed to clean the outer circumferential surface of the first pipe 3, the sampling end 21 is blown through the first pipe 3, so that the dust on the outer circumferential surface of the first pipe 3 is cleaned.

[0038] The friction member 4 is arranged in the shell 1, and the sampling end 21 of the sampling pipe 2 is arranged in the friction member 4, and the sampling pipe 2 moves in the shell 1, so that the friction member 4 cleans the dust on the sampling end 21. Specifically, the friction member 4 can be a brush, the friction member 4 is arranged at the left end of the shell 1, and the sampling pipe 2 is arranged in the friction member 4, when the high-humidity coal powder adheres to the outer part of the sampling pipe 2, the sampling end 21 is moved, so that the outer circumferential surface of the sampling end 21 is rubbed with the inner circumferential surface of the friction member 4, thereby cleaning the high-humidity coal powder adhered to the sampling end 21.

[0039] The sampling device 100 for the coal mill in the embodiment of the application is provided with the sampling pipe 2 and the first pipe 3, the inner and outer surfaces of the sampling end 21 are cleaned by blowing, the friction member 4 is arranged to mechanically clean the sampling end 21, thereby reducing the plugging of the filter element, ensuring the normal use of the sampling device, and prolonging the service life of the sampling device.

[0040] In some embodiments, the sampling device 100 for the coal mill further comprises a driving assembly 5, the driving assembly 5 is connected with the sampling pipe 2, so as to drive the sampling pipe 2 to move in the shell 1. Thus, the sampling pipe 2 is driven to move in the shell 1 by the driving assembly 5, thereby cleaning the coal powder on the sampling end 21, and ensuring the detection result of the subsequent detection sample gas.

[0041] In some embodiments, the driving assembly 5 comprises a support rod 51, a first plate 52, a second plate 53, a first bellows 54 and a second bellows 55.

[0042] The support rod 51 is arranged in the shell 1. Specifically, as shown in Figures 2-4 the support rod 51 is a plurality of support rods 51, the plurality of support rods 51 are arranged in the shell 1, and the plurality of support rods 51 are arranged in the circumferential direction of the shell 1, and the right end of the support rod 51 is arranged on the right end cover 11 of the shell 1, thereby fixing the support rod 51 in the shell 1.

[0043] The first plate 52 and the second plate 53 are arranged on the support rod 51, and the first plate 52 is located between the second plate 53 and the friction member 4, the second plate 53 is movable relative to the support rod 51 in the axial direction of the support rod 51, and the sampling pipe 2 is connected with the second plate 53 through the first plate 52, so as to drive the sampling pipe 2 to move by the second plate 53. Specifically, as shown in Figures 2-4As shown, the first plate 52 is fixed at the left end of the support rod 51, the second plate 53 is arranged in the housing 1 and located at the left end of the first plate 52, the second plate 53 can move on the support rod 51 in the left-right direction, the right end of the sampling tube 2 passes through the first plate 52 and is connected with the second plate 53 through the fastener.

[0044] The first bellows 54 is sleeved in the second bellows 55, the outer circumferential surface of the first bellows 54 and the inner circumferential surface of the second bellows 55 are arranged in the radial direction of the first tube 3 to form the chamber 551, the second bellows 55 is communicated with the sampling tube 2, one end of the first bellows 54 and one end of the second bellows 55 are connected with the second plate 53, the other end of the first bellows 54 and the other end of the second bellows 55 are connected with the housing 1, the drive assembly 5 has a first state and a second state, in the first state, the first bellows 54 and the second bellows 55 are contracted to drive the second plate 53 to move in the direction away from the first plate 52, in the second state, the first bellows 54 and the second bellows 55 are elongated to drive the second plate 53 to move in the direction adjacent to the first plate 52.

[0045] Specifically, as shown, Figures 2-4 The first bellows 54 and the second bellows 55 are both made of stainless steel material, the first bellows 54 is arranged in the second bellows 55, the left end of the first bellows 54 and the left end of the second bellows 55 are connected with the right end of the second plate 53, the right end of the first bellows 54 and the right end of the first bellows 54 are connected with the right end cover 11 of the housing 1, the right end cover 11 is provided with a through hole penetrating through the right end cover 11, the through hole is communicated with the chamber 551, the chamber 551 is inflated or deflated through the through hole, so as to drive the first bellows 54 and the second bellows 55 to elongate or contract, thereby driving the second plate 53 to move in the left-right direction, and further driving the sampling tube 2 to move in the left-right direction, the pipeline is communicated with the first bellows 54, in addition, the sampling tube 2 is internally purged by inflating the first bellows 54, or the sample gas enters the first bellows 54 through the sampling tube 2, and then the sample gas in the first bellows 54 is extracted, so that the sampling tube 2 can be internally purged while moving in the left-right direction through the arrangement of the first bellows 54 and the second bellows 55, and the sampling tube 2 is independent of each other and does not affect each other, thereby ensuring the cleaning efficiency of the sampling device.

[0046] It can be understood that the driving mode of the sampling tube 2 is not limited to this, for example, it can be driven by a mechanical drive, such as: air pump, electric telescopic rod, or hydraulic rod, etc. Or the user manually drives according to the actual situation, so that the sampling tube 2 moves in the left-right direction in the housing 1.

[0047] In some embodiments, the coal mill sampling device further comprises an elastic member 56, which is arranged on the first tube 3 between the first plate 52 and the second plate 53, and has an elastic force for driving the second plate 53 to move away from the first plate 52. Specifically, as shown in Figures 2-4 the elastic member 56 is a compression spring arranged on the outer circumferential surface of the first tube 3, the left end of the elastic member 56 abuts against the first plate 52, the right end of the elastic member 56 abuts against the second plate 53, and the elastic member 56 has a driving force for driving the second plate 53 to move from left to right. Under the action of the compression spring, the driving assembly 5 quickly changes from the second state to the first state, thereby reducing the time for cleaning dust of the sampling device.

[0048] In some embodiments, in the first state, the chamber 551 is in communication with the first tube 3, so that the gas in the chamber 551 flows into the first tube 3 to blow the sampling end 21 of the sampling tube 2. In this way, when the sampling end 21 of the sampling tube 2 moves from left to right, the sampling end 21 of the sampling tube 2 can also be blown through the first tube 3, thereby increasing the blowing area and achieving cleaning and blowing of the sampling end 21. Through the combined action of mechanical cleaning and pulse pressurized blowing, the cleaning efficiency of the sampling end 21 is improved, and the cleaning effect of the sampling end 21 is increased.

[0049] In some embodiments, the support rod 51 comprises a first segment 511 and a second segment 512 connected to each other, one end of the second segment 512 is arranged on the housing 1, the first plate 52 and the second plate 53 are arranged on the second segment 512, and the second plate 53 is movable relative to the support rod 51 in the axial direction of the second segment 512. The projection of the first segment 511 is located in the second segment 512 in the projection plane orthogonal to the axial direction of the support rod 51. In the first state, the second plate 53 abuts against one end of the second segment 512 adjacent to the first segment 511.

[0050] Specifically, as shown in Figure 2 the first segment 511 is located at the left end of the second segment 512, the right end of the second segment 512 is fixed on the right end cover 11, the second plate 53 and the first plate 52 are arranged on the first segment 511, and the second plate 53 is movable in the left-right direction on the first segment 511. The cross-sectional area of the first segment 511 is smaller than that of the second segment 512. In the first state, the right side of the second plate 53 abuts against the left end surface of the second segment 512, thereby limiting the movement distance of the second plate 53.

[0051] In some embodiments, the coal mill sampling device 100 further comprises a second tube 6 arranged at one end of the first plate 52 away from the second plate 53, a friction member 4 arranged in the first tube 3 at one end of the first tube 3 away from the first plate 52, and a sampling tube 2 arranged in the first tube 3. Specifically, as shown in Figures 2-4As shown, the second tube 6 is arranged at the right end of the first plate 52, the friction member 4 is arranged at the left end of the second tube 6, and the sampling tube 2 is arranged in the first tube 3, so that the friction member 4 is provided with a mounting base through the second tube 6, and the sampling tube 2 is also protected through the second tube 6, preventing the sampling tube 2 from being damaged when not in use, and prolonging the service life of the sampling tube 2.

[0052] In some embodiments, the second tube 6 is provided with a plurality of grooves 61 at the end away from the first plate 52, the grooves 61 extend through the second tube 6 in the inner-outer direction and in the axial direction of the second tube 6, and the plurality of grooves 61 are arranged at intervals in the circumferential direction of the second tube 6. Specifically, as shown in Figure 1 As shown, the left end of the second tube 6 is provided with a plurality of grooves 61 arranged at intervals in the circumferential direction of the second tube 6, and a part of the friction member 4 is arranged opposite the grooves 61 in the inner-outer direction, so that the coal ash cleaned by the friction member 4 flows out of the second tube 6 through the grooves 61.

[0053] In some embodiments, the friction member 4 is provided with a through hole (not shown in the figure) extending through the friction member 4, the through hole is arranged opposite the grooves 61 in the inner-outer direction, and the other end of the second tube 6 is arranged in the through hole and opposite the sampling tube 2 in the inner-outer direction. Specifically, as shown in Figure 1 As shown, the friction member 4 is provided with a through hole, and the through hole is in communication with one of the plurality of grooves 61, so that the left end of the first tube 3 is arranged opposite the sampling end 21 through the groove 61 and the through hole, thereby blowing the dust on the friction member 4 and the groove 61 out of the second tube 6 through the first tube 3 to prevent dust accumulation in the second tube 6.

[0054] The cleaning system of the sampling device 100 for the coal mill according to the embodiments of the present application is as follows:

[0055] As shown in Figure 6 The cleaning system includes a gas source 7, a first electromagnetic valve 8, a second electromagnetic valve 9, a third electromagnetic valve 10, a three-position two-way electromagnetic valve 101, and a one-way valve 102. The gas source 7 is in communication with the chamber 551 of the driving assembly 5 through a first pipeline, the gas source 7 is in communication with the first tube 3 through a second pipeline, the gas source 7 is in communication with the sampling tube 2 through a third pipeline, the first electromagnetic valve 8 is arranged on the first pipeline to control the opening and closing of the first pipeline, the second electromagnetic valve 9 is arranged on the second pipeline to control the opening and closing of the second pipeline, the third electromagnetic valve 10 is arranged on the third pipeline to control the opening and closing of the third pipeline, the chamber 551 is in communication with the first tube 3 and the gas source 7 through the three-position two-way electromagnetic valve 101, and the one-way valve 102 is arranged between the three-position two-way electromagnetic valve 101 and the first tube 3 to prevent the gas in the first tube 3 from flowing into the chamber 551.

[0056] When the sampling device 100 for the coal mill is sampling, as shown in Figure 6 and Figure 3As shown, the first electromagnetic valve 8, the second electromagnetic valve 9, the third electromagnetic valve 10 and the three-position two-way electromagnetic valve 101 are all closed, and the sampling pipe 2 is connected to the external detection device through the pipeline to sample the sample gas at the outlet of the coal mill.

[0057] When the sampling device 100 for the coal mill is cleaned, as shown in Figure 6 and Figure 2 the first electromagnetic valve 8, the second electromagnetic valve 9 and the third electromagnetic valve 10 are all opened, the air source 7 fills the chamber 551, the chamber overcomes the spring force to compress the spring and elongate the chamber. During the elongation of the chamber, the relative motion between the dust scraping ring and the filter element will clean the wet coal powder attached to the outer surface of the filter element, then the third electromagnetic valve 10 is opened to blow the inner surface of the sampling end 21 of the sampling pipe 2 for a period of time, the third electromagnetic valve 10 is closed, the second electromagnetic valve 9 is opened to blow the outer surface of the sampling end 21 of the sampling pipe 2, the second electromagnetic valve 9 is closed, and the three-position two-way electromagnetic valve 101 is reversed, the air in the chamber is rapidly discharged under the driving force of the elastic element 56, the discharged air flows into the first pipeline to increase the pressure in the first pipeline, and the sampling end 21 of the sampling pipe 2 is retracted during the blowing to increase the blowing area, thereby realizing the cleaning and blowing of the sampling end 21 of the sampling pipe 2. Then the second electromagnetic valve 9 is closed, the three-position two-way electromagnetic valve 101 returns to the original position, and the sampling end 21 of the sampling pipe 2 returns to the original position to become a sampling state.

[0058] The sampling method for the coal mill according to the embodiment of the application utilizes the sampling device 100 for the coal mill in any of the above embodiments, which comprises:

[0059] S1: driving the sampling pipe 2 to move along the axial direction to clean the dust on the sampling end 21 of the sampling pipe 2 by moving the sampling end 21 of the sampling pipe 2 relative to the friction element 4. Specifically, the chamber 551 of the driving device is filled with air to drive the second plate 53 to move to the left, thereby driving the sampling end 21 of the sampling pipe 2 to move to the left to make the friction element 4 and the sampling end 21 slide relative to each other, and then the dust on the sampling end 21 of the sampling pipe 2 is cleaned by the friction element 4.

[0060] S2: air is supplied to the sampling pipe 2 and the first pipeline 3 to blow the inside of the sampling pipe 2 and the outside of the sampling pipe 2.

[0061] S3: after the cleaning, the sampling pipe 2 is used to sample the coal mill.

[0062] The sampling method for the coal mill according to the embodiment of the application ensures the sampling efficiency of the sampling pipe 2, prevents the sampling pipe 2 from being blocked, and prolongs the service life of the sampling pipe 2.

[0063] In the description of the present application, it is to be understood that the orientations or positional relationships indicated by the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like are based on the orientations or positional relationships shown in the drawings, and are only for the purpose of facilitating the description of the present application and simplifying the description, and do not indicate or imply that the devices or elements indicated thereby must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application.

[0064] In addition, the terms "first", "second", "third", etc. are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated thereby. Therefore, the features defined with "first", "second", etc. can explicitly or implicitly include at least one of the features. In the description of the present application, the meaning of "a plurality of" is at least two, such as two, three, etc., unless otherwise explicitly specified and limited.

[0065] In the present application, unless otherwise explicitly specified and limited, the terms "mounting", "connecting", "connecting", "fixing" and the like should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or it can be integrated; it can be mechanically connected, or it can be electrically connected or in communication with each other; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the internal communication or interaction relationship of two elements, unless otherwise explicitly limited. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0066] In the present application, unless otherwise explicitly specified and limited, the first feature is "on" or "under" the second feature, which can be direct contact between the first and second features, or indirect contact between the first and second features through an intermediate medium. Moreover, the first feature "above", "above" and "above" the second feature can be directly above or obliquely above the first feature, or only indicate that the horizontal height of the first feature is higher than that of the second feature. The first feature "below", "below" and "below" the second feature can be directly below or obliquely below the first feature, or only indicate that the horizontal height of the first feature is less than that of the second feature.

[0067] In this disclosure, the terms "one embodiment", "some embodiments", "an example", "a specific example", or "some examples" mean that a particular feature, structure, material, or characteristic is included in at least one embodiment or example of the present disclosure. The illustrative appearances of the above-mentioned terms in various places in the specification are not necessarily referred to the same embodiment or example. Moreover, the particular features, structures, materials, or characteristics can be combined in any suitable manner in one or more embodiments or examples. Furthermore, the terminology "comprising" is used in the disclosure as comprising, but not limited to, any indicated features, integers, steps or components. It is also to be understood that the terminology "comprising" can be replaced by the terminology "consisting of" or "consisting essentially of" in some embodiments or examples.

[0068] Although the above-mentioned embodiments have been shown and described, it is to be understood that the above-mentioned embodiments are exemplary, and should not be understood as limiting the present disclosure, and the changes, modifications, replacements and variations of the above-mentioned embodiments made by those skilled in the art are within the protection scope of the present disclosure.

Claims

1. A sampling device for a coal mill, characterised in that, The utility model relates to a dust sampling device, comprising: a housing; a sampling tube movably arranged in the housing along an axial direction, the sampling tube having a sampling end and a mounting end in the axial direction, the mounting end adapted to communicate with a pipeline so that the sampling tube samples or purges the sampling tube; a first tube arranged in the housing, one end of the first tube being spaced apart from the sampling end along an inner-outer direction of the housing so that dust on the sampling end is blown out of the sampling tube through the first tube; a rubbing member arranged in the housing, the sampling end of the sampling tube being arranged in the rubbing member, the sampling tube being moved in the housing so that the rubbing member cleans dust on the sampling end; a driving assembly connected to the sampling tube to move the sampling tube in the housing; the driving assembly comprising: a support rod arranged in the housing; a first plate and a second plate both arranged on the support rod, the first plate being located between the second plate and the rubbing member, the second plate being movable relative to the support rod along an axial direction of the support rod, the mounting end of the sampling tube being connected to the second plate through the first plate so that the second plate moves the sampling tube; a first bellows and a second bellows, the first bellows being sleeved on the second bellows, an outer circumferential surface of the first bellows and an inner circumferential surface of the second bellows being spaced apart along a radial direction of the first tube to form a chamber, the second bellows being in communication with the sampling tube, one end of the first bellows and one end of the second bellows being connected to the second plate, the other end of the first bellows and the other end of the second bellows being connected to the housing; the driving assembly having a first state and a second state, in the first state, the first bellows and the second bellows are contracted to move the second plate towards a direction away from the first plate, and the chamber is in communication with the first tube so that gas in the chamber flows into the first tube to purge the sampling end of the sampling tube, in the second state, the first bellows and the second bellows are elongated to move the second plate towards a direction adjacent to the first plate.

2. A sampling device for a coal mill as claimed in claim 1, characterised in that, a resilient member arranged on the sampling tube and located between the first plate and the second plate, the resilient member having an elastic force to drive the second plate to move away from the first plate.

3. A sampling device for a coal mill as claimed in claim 2, characterised in that, the support rod comprising a first segment and a second segment connected to each other, one end of the second segment being arranged in the housing, the first plate and the second plate being arranged on the second segment, and the second plate being movable relative to the support rod along an axial direction of the second segment, a projection of the first segment being located in the second segment in a projection plane orthogonal to an axial direction of the support rod, in the first state, the second plate abuts one end of the second segment adjacent to the first segment.

4. The sampling device for a coal mill according to claim 1, characterized in that, A second tube is arranged at one end of the first tube away from the second tube, the friction member is arranged in the first tube and located at one end of the first tube away from the first plate, and the sampling tube is arranged in the first tube.

5. A sampling device for a coal mill as claimed in claim 4, characterised in that, The second tube is provided with a plurality of grooves at one end thereof away from the first plate, the grooves extend through the second tube in the inner-outer direction and along the axial direction of the second tube, and the grooves are arranged at intervals along the circumferential direction of the second tube.

6. A sampling device for a coal mill as claimed in claim 5, characterised in that, The friction member is provided with a through hole extending through the friction member, the through hole is arranged opposite to the grooves in the inner-outer direction, the other end of the first tube is arranged in the through hole and arranged opposite to the sampling tube in the inner-outer direction.

7. A sampling method for a coal mill, using the sampling device for a coal mill according to any one of claims 1-6, comprising: S1: driving the sampling tube to move along the axial direction thereof, so that the sampling end of the sampling tube moves opposite to the friction member to clean the sampling end of the sampling tube; S2: ventilating the sampling tube and the first tube to purge the inside of the sampling tube and the outside of the sampling tube; S3: after cleaning, sampling the coal mill by using the sampling tube.

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