Pulverized coal sampling device

Abstract

The utility model relates to the technical field of pulverized coal sampling, and discloses a pulverized coal sampling device. The pulverized coal sampling device comprises a sampling gun assembly and a sealing joint, the sampling gun assembly comprises a gun barrel and a sleeve, and a first sealing piece is arranged between the gun barrel and the sleeve; sealing assemblies are arranged on the inner walls of the two ends of the sealing joint respectively, one sealing assembly is used for being arranged on the periphery of the pulverized coal sampling pipeline in a sleeving mode, and the other sealing assembly is used for being arranged on the periphery of the sleeve in a sleeving mode; the sealing assembly comprises a second sealing piece, a gas gathering groove is formed in the second sealing piece, and airflow flowing to the gas gathering groove can push an inner ring of the second sealing piece. Coal samples are collected through the pulverized coal sampling device, the labor cost is saved, the working efficiency is improved, when airflow entrained with pulverized coal tends to flow out of the sleeve, the airflow enters the gas gathering groove firstly, the airflow entering the gas gathering groove pushes the outer ring and the inner ring of the second sealing piece, the sealing effect is further improved, and the sealing effect is improved. Therefore, pulverized coal leakage can be thoroughly prevented.

Description

Technical Field

[0001] The utility model relates to the technical field of coal powder sampling, in particular to a coal powder sampling device. Background Art

[0002] In recent years, with the improvement and optimization of boiler combustion, improving energy efficiency, reducing pollutant emissions, and promoting green development have become the mainstream development direction. Coal powder fineness and coal powder uniformity index have different degrees of influence on boiler combustion efficiency, flame stability, pollutant emissions, and heating surface wear. In order to reduce the adverse effects of coal powder fineness and uniformity index on boiler combustion, the supervision of coal powder delivery into the boiler should be strengthened to ensure that the coal powder fineness and uniformity are suitable for the current boiler combustion conditions.

[0003] Coal powder injection is inevitable during the pulverized coal sampling and testing process. Frequent pulverized coal sampling and long-term pulverized coal leakage in the boiler plant will have a direct impact on the health of the workers, such as irritation of the eyes, skin and respiratory system, and allergic reactions. It will also pollute the surrounding water quality and indirectly affect human drinking water safety. Taking all factors into consideration, solving the injection problem during pulverized coal sampling will have a beneficial impact on the safe and economical operation of power plants.

[0004] The primary air will carry the pulverized coal into the boiler for combustion after passing through the coal mill. The pulverized coal transportation process is kept under positive pressure. Therefore, when the staff samples the pulverized coal at the sampling port of the pulverized coal transportation pipeline, pulverized coal injection leakage will inevitably occur. At present, there are two main methods to solve the injection leakage during the manual sampling of pulverized coal. One is that the sampling personnel and the centralized control operator keep in touch during the pulverized coal sampling process. When the sampling personnel take samples from a certain pulverized coal transportation pipe, they first communicate with the operator to close the valve of the pipeline. After the sampling gun is inserted into the pulverized coal transportation pipe and anti-injection measures are taken, the operator is notified to open the valve of the pipeline for sampling. After the sampling is completed, the operator is notified again to close the valve. After removing the anti-pulverized coal injection measures and pulling out the sampling gun, the operator is notified to open the valve to maintain the normal operation of the boiler. The above method takes 15 to 20 minutes for each sampling, and each pipeline needs to be sampled 2 to 3 times. At present, the number of pulverized coal transportation pipelines in the operating power plant is between 20 and 40. Sampling pulverized coal in the above sampling method will consume huge manpower and time costs. Another sampling method is that the sampling gun extension process and the sampling port ball valve opening and closing are closely coordinated. This process requires flexible materials such as polyurethane and canvas to block the coal powder injection. In this sampling process, a large amount of injection leakage is inevitable. The sampling gun can only be inserted into the coal powder conveying pipeline from the sampling port when the ball valve opening reaches 100%. Therefore, a large amount of coal powder injection will be generated during the opening and closing of the ball valve. In addition, the sampling gun and the ball valve opening cannot fit completely, and the flexible blocking measures cannot achieve complete blocking. In this process, it is inevitable that the airflow carrying fine coal powder will leak out.

[0005] It can be seen that in the current powder extraction and detection process, the method of preventing coal powder injection leakage wastes labor and time costs, and the problem of incomplete prevention of coal powder injection leakage. Utility Model Content

[0006] In order to solve the technical problems of wasting manpower and time costs in preventing coal powder injection leakage and incompletely preventing coal powder injection leakage during the current powder collection and detection process, the utility model provides a coal powder sampling device.

[0007] The utility model provides a coal powder sampling device, comprising:

[0008] A sampling gun assembly comprises a gun barrel and a sleeve sleeved on the outer periphery of the gun barrel, wherein a first sealing member is provided between the gun barrel and the sleeve;

[0009] The sealing joint has sealing components on the inner walls of both ends, one of which is used to be sleeved on the outer periphery of the coal powder sampling pipeline, and the other is used to be sleeved on the outer periphery of the casing;

[0010] Wherein, the sealing assembly includes a second sealing member, and a gas gathering groove is provided on one side of the second sealing member facing the center direction of the sealing joint.

[0011] Optionally, the side of the second sealing member provided with the gas gathering groove is inclined inwardly to form an inclined portion, and the inclined portion is used to contact the outer periphery of the coal powder sampling pipeline or the outer periphery of the sleeve.

[0012] Optionally, the inner side of the gas gathering groove is concave toward the axial direction of the second sealing member to form a wind ring.

[0013] Optionally, the sealing assembly further includes a transmission member and an operating member, and the operating member can push the second sealing member to move through the transmission member, so that the inner ring of the second sealing member can shrink inward or expand outward.

[0014] Optionally, the transmission member includes:

[0015] A transmission buckle, arranged on one side of the second sealing member away from the center direction of the sealing joint, and the transmission buckle is connected with the second sealing member by clamping;

[0016] A transmission clamp spring, arranged on a side of the transmission buckle away from the second sealing member, the transmission clamp spring being connected to the operating member;

[0017] Wherein, a slope surface is provided on the inner side of the transmission buckle facing one end of the transmission clamping spring, and the transmission clamping spring is supported on the slope surface of the transmission buckle.

[0018] Optionally, the operating member includes a release, one end of the release extends into the interior of the sealing joint, and the other end extends out of the sealing joint, and the outer periphery of the end of the release extending into the interior of the sealing joint is provided with a sloped surface, the cross-section of the transmission retaining spring is bent, the outer ring of the transmission retaining spring is supported on the inner wall of the sealing joint, the inner ring of the transmission retaining spring is wedge-fitted with the sloped surface of the release, and the inner ring end of the transmission retaining spring is supported on the sloped surface of the transmission retaining spring.

[0019] Optionally, the sealing assembly also includes a limit block, which is arranged on the inner wall of the sealing joint, the outer ring of the transmission retaining spring is supported on the limit block, the outer periphery of the release is provided with a limit groove, and the inner ring of the limit block is provided with a limit slider that slides in cooperation with the limit groove.

[0020] Optionally, a sealing groove is formed between the sleeve and the gun barrel, the first sealing member is disposed in the sealing groove, and the outer diameter of the gun barrel is greater than the inner diameter of the first sealing member.

[0021] Optionally, mounting grooves are respectively provided at both ends of the sealing joint, and the two sealing assemblies are respectively arranged in the two mounting grooves, and the step surfaces of the two mounting grooves are respectively used to abut against the end of the coal powder sampling pipeline and the end of the sleeve, and a guide block is provided on the step surface of the mounting groove, and the guide block is extended toward the gas gathering groove.

[0022] Optionally, the air extraction end of the gun barrel is connected to a coal powder collecting assembly, and the coal powder collecting assembly comprises:

[0023] An air extractor connected to the air extraction end of the gun barrel via an air extraction pipeline;

[0024] A cyclone separator connected to the air extraction pipeline;

[0025] And / or, a sampling port is provided at the sampling end of the gun barrel, and the sampling port is opened toward the conveying direction of the coal powder.

[0026] Compared with the prior art, the technical solution provided by the present invention has the following advantages:

[0027] The utility model collects coal samples through a coal powder sampling device, thereby saving labor costs and increasing work efficiency. The gun barrel and the sleeve are sealed by a first sealing component, and the two ends of the sealing joint are respectively sealed and connected to the outer periphery of the coal powder sampling pipeline and the outer periphery of the sleeve. At the same time, when the airflow entrains coal powder and has a tendency to flow out of the sleeve, the airflow will first enter the gas gathering groove, and the airflow entering the gas gathering groove will push the outer ring of the second sealing component to press against the sealing joint, and push the inner ring of the second sealing component to press against the outer periphery of the coal powder sampling pipeline and the outer periphery of the sleeve, thereby further increasing the sealing effect, so as to completely prevent coal powder leakage, avoid the phenomenon of airflow carrying coal powder to escape, and thus avoid polluting the environment and harming the sampling personnel. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] The accompanying drawings herein are incorporated in and constitute a part of the specification, illustrate embodiments consistent with the present utility model, and together with the description, are used to explain the principles of the present utility model.

[0029] In order to more clearly illustrate the implementation mode of the utility model or the technical solution in the prior art, the drawings required for use in the implementation mode or the description of the prior art will be briefly introduced below. Obviously, for ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0030] Figure 1 This is a schematic diagram of the structure of the coal powder sampling device according to the embodiment of the utility model;

[0031] Figure 2 This is a structural schematic diagram of the arrangement of the sealing assembly described in the embodiment of the utility model;

[0032] Figure 3 This is a structural view of the matching mode between the sleeve and the sealing assembly according to the embodiment of the utility model;

[0033] Figure 4 It is a structural schematic diagram of the sealing assembly when the release is in a pressed state according to an embodiment of the utility model.

[0034] Description of Reference Numerals

[0035] 1. Sampling gun assembly; 11. Gun barrel; 111. Sampling port; 12. Casing; 13. First sealing member; 14. Sealing groove; 2. Sealing joint; 21. Sealing assembly; 211. Second sealing member; 2111. Gas collecting groove; 2112. Inclined portion; 2113. Winding ring; 212. Transmission member; 2121. Transmission buckle; 2122. Transmission retaining spring; 213. Operating member; 2131. Release; 2132. Limiting slide groove; 214. Limiting block; 2141. Limiting slider; 22. Mounting groove; 221. Guide block; 3. Coal powder conveying pipe; 31. Coal powder sampling pipeline; 32. Ball valve; 4. Coal powder collecting assembly; 41. Vacuum; 42. Exhaust pipeline; 43. Cyclone separator; 44. Pressure gauge. DETAILED DESCRIPTION

[0036] In order to more clearly understand the above-mentioned purpose, features and advantages of the utility model, the scheme of the utility model will be further described below. It should be noted that the embodiments of the utility model and the features in the embodiments can be combined with each other without conflict.

[0037] The following description sets forth many specific details to facilitate a full understanding of the present invention, but the present invention may also be implemented in other ways different from those described herein; obviously, the implementation methods in the specification are only part of the implementation methods of the present invention, rather than all of the implementation methods.

[0038] Combination Figures 1 to 4 As shown, the coal powder sampling device provided in the embodiment of the utility model includes a sampling gun assembly 1 and a sealing joint 2.

[0039] like Figure 1 As shown, the sampling gun assembly 1 includes a gun barrel 11 and a sleeve 12 sleeved on the outer periphery of the gun barrel 11, and a first sealing member 13 is provided between the gun barrel 11 and the sleeve 12, that is, a center hole is coaxially provided in the middle of the sleeve 12, and the gun barrel 11 can be inserted into the center hole. The first sealing member 13 is provided on the inner wall of the sleeve 12, and the gun barrel 11 penetrating the center hole can pass through the first sealing member 13. The sealing effect between the gun barrel 11 and the sleeve 12 can be ensured by providing the first sealing member 13, wherein the first sealing member 13 can be a sealing ring or the like.

[0040] The inner walls at both ends of the sealing joint 2 are respectively provided with sealing components 21, and the sealing components 21 are arranged on the inner wall of the sealing joint 2. One of the sealing components 21 is used to be sleeved on the outer periphery of the coal powder sampling pipeline 31 to achieve a sealed connection between the end of the sealing joint 2 and the end of the coal powder sampling pipeline 31, and the other sealing component 21 is used to be sleeved on the outer periphery of the sleeve 12 to achieve a sealed connection between the other end of the sealing joint 2 and the end of the sleeve 12.

[0041] The sealing assembly 21 includes a second sealing member 211 , which may be a sealing ring, etc. A gas collecting groove 2111 is provided on one side of the second sealing member 211 facing the center of the sealing joint 2 , that is, the gas collecting groove 2111 is opened on the side of the second sealing member 211 .

[0042] When the coal powder is in the coal powder conveying pipe 3, it is necessary to sample the coal powder. A coal powder sampling pipe 31 is provided on the coal powder conveying pipe 3. The coal powder sampling pipe 31 is usually arranged on the peripheral wall of the coal powder conveying pipe 3, and a ball valve 32 is provided on the coal powder sampling pipe 31 to control the on-off of the coal powder sampling pipe 31.

[0043] When the coal powder sampling device provided by the present application is used, the coal powder sampling pipeline 31 is connected to the sleeve 12 through the sealing joint 2, and the two sealing components 21 are respectively located between the coal powder sampling pipeline 31 and the sealing joint 2 and between the sleeve 12 and the sealing joint 2. The gun barrel 11 is inserted into the sleeve 12, and the outer periphery of the gun barrel 11 and the inner wall of the sleeve 12 are sealed by the first sealing member 13. The gun barrel 11 passes through the sleeve 12 and is inserted into the coal powder sampling pipeline 31 until it extends to the position of the ball valve 32. The ball valve 32 is opened, and the gun barrel 11 is further extended to the center of the air flow of the coal powder conveying pipe 3, and the air flow carries the coal powder into the gun barrel 11. In addition, part of the air flow will carry the coal powder to the space enclosed by the gun barrel 11 and the coal powder sampling pipeline 31. At this time, the first sealing member 13 in the bracket of the gun barrel 11 and the sleeve 12 can prevent the coal powder from flowing out through the gap between the gun barrel 11 and the sleeve 12. The airflow flowing to the sealing assembly 21 will flow to the gas gathering groove 2111. At this time, the airflow flowing to the gas gathering groove 2111 can push the inner ring of the second sealing member 211 toward the axial direction of the second sealing member 211, and the airflow flowing to the gas gathering groove 2111 can push the outer ring of the second sealing member 211 toward the axial direction away from the second sealing member 211, so as to increase the sealing effect of the second sealing member 211. In this design, the gun barrel 11 and the coal powder sampling pipeline 31 are connected by the sleeve 12 with the first sealing member 13 and the sealing joint 2, and the gun barrel 11 and the coal powder sampling pipeline 31 can be closed and connected before the ball valve 32 is opened, so that the coal powder can be prevented from being sprayed during the process of opening and closing the ball valve 32 and the sampling process.

[0044] The utility model collects coal samples through a coal powder sampling device, which saves labor costs and increases work efficiency. The gun barrel 11 and the sleeve 12 are sealed by a first seal 13, and the two ends of the sealing joint 2 are respectively sealed and connected to the outer periphery of the coal powder sampling pipe 31 and the outer periphery of the sleeve 12. At the same time, when the airflow entrains coal powder and has a tendency to flow out of the sleeve 12, the airflow will first enter the gas gathering groove 2111, and the airflow entering the gas gathering groove 2111 will push the outer circle of the second seal 211 to press against the sealing joint 2, and push the inner circle of the second seal 211 to press against the outer periphery of the coal powder sampling pipe 31 and the outer periphery of the sleeve 12, thereby further increasing the sealing effect, so as to completely prevent coal powder leakage, avoid the phenomenon of airflow carrying coal powder to escape, and thus avoid polluting the environment and harming the sampling personnel.

[0045] In some embodiments, in combination Figures 2 to 4 As shown, the side of the second sealing member 211 provided with the gas collecting groove 2111 is inclined inwardly to form an inclined portion 2112 , and the inclined portion 2112 is used to contact the outer periphery of the coal powder sampling pipeline 31 or the outer periphery of the sleeve 12 .

[0046] In this design, the airflow in the gas collecting groove 2111 will push the inclined portion 2112 to move toward the axial direction of the second sealing member 211, so that the inclined portion 2112 can be deformed, and the degree of close contact between the inclined portion 2112 and the outer periphery of the coal powder sampling pipe 31 or the outer periphery of the sleeve 12 can be increased, so as to further increase the sealing effect. In addition, the design of the inclined portion 2112 can also increase the convenience of inserting the sleeve 12 or the coal powder sampling pipe 31 into the sealing assembly 21.

[0047] In some embodiments, continue to refer to Figure 2 and Figure 4 The inner side of the gas gathering groove 2111 is concave inwardly toward the axial direction of the second sealing member 211 to form a wind ring 2113 .

[0048] Under this design, the cross-section of the gas gathering groove 2111 is trapezoidal, and the airflow entering the gas gathering groove 2111 will enter the ventilation ring 2113, so that the airflow exerts a force on the inclined portion 2112 in the axial direction of the second sealing member 211, further pressing the inclined portion 2112 against the outer periphery of the coal powder sampling pipe 31 or the outer periphery of the sleeve 12.

[0049] In some embodiments, mounting grooves 22 are respectively provided at both ends of the sealing joint 2, and two sealing assemblies 21 are respectively arranged in the two mounting grooves 22, and the step surfaces of the two mounting grooves 22 are respectively used to abut against the end of the coal powder sampling pipeline 31 and the end of the sleeve 12, and a guide block 221 is provided on the step surface of the mounting groove 22, and the guide block 221 is extended toward the gas gathering groove 2111.

[0050] In this design, the step surfaces of the two mounting grooves 22 are used to abut against the end of the coal powder sampling pipe 31 and the end of the sleeve 12, respectively, so that the gap between the two step surfaces of the mounting groove 22 and the end of the coal powder sampling pipe 31 and the end of the sleeve 12 is reduced, further reducing the airflow carrying coal powder to flow to the mounting groove 22. In addition, a guide block 221 is provided on the step surface of the mounting groove 22, so that the airflow is guided to the gas gathering groove 2111 through the guide block 221, so that the airflow preferentially pushes the inner ring and the outer ring of the second sealing member 211, ensuring the sealing effect and preventing the phenomenon of coal powder being carried by the airflow from escaping.

[0051] In some embodiments, in combination Figures 2 to 4 As shown, the sealing assembly 21 further includes a transmission member 212 and an operating member 213. The operating member 213 can push the second sealing member 211 to move through the transmission member 212, so that the inner ring of the second sealing member 211 can shrink inward or expand outward.

[0052] Since the inner ring (inclined portion 2112) of the second seal 211 is pressed against the outer periphery of the sleeve 12 or the coal powder sampling pipe 31, the inner ring of the second seal 211 is closely matched with the outer periphery of the sleeve 12 or the coal powder sampling pipe 31. In order to increase the convenience of disassembly after sampling, the present application is provided with an operating member 213 and a transmission member 212, so that the operating member 213 can be operated manually, so that the operating member 213 can drive the inner ring of the second seal 211 to expand outward through the transmission member 212, thereby enabling the inner ring of the second seal 211 to be separated from the outer periphery of the sleeve 12 or the coal powder sampling pipe 31, which is convenient for disassembly, and the same operation can be performed during installation, thereby increasing the convenience of installation.

[0053] In some embodiments, in combination Figures 2 to 4 As shown, the transmission member 212 includes a transmission buckle 2121 and a transmission retaining spring 2122 .

[0054] The transmission buckle 2121 is arranged on one side of the second sealing member 211 away from the center direction of the sealing joint 2, and the transmission buckle 2121 is connected by clamping with the second sealing member 211. Specifically, an annular clamping groove is provided on the inner side of the side of the second sealing member 211 away from the inclined portion 2112, and an annular clamping block is provided on the end side of the transmission buckle 2121 to be clamped with the annular clamping groove, and the annular clamping block is clamped in the annular clamping groove, so that the transmission buckle 2121 is connected by clamping with the second sealing member 211, so that the force applied to the transmission buckle 2121 can be transmitted to the second sealing member 211.

[0055] The transmission clip spring 2122 is arranged on a side of the transmission buckle 2121 away from the second sealing member 211, and the transmission clip spring 2122 is connected to the operating member 213, wherein the connection here can be abutment, etc., and can be designed according to actual needs. The inner side of the transmission buckle 2121 facing one end of the transmission clip spring 2122 is provided with a slope surface, and the transmission clip spring 2122 is supported on the slope surface of the transmission buckle 2121.

[0056] Under this design, when the operating member 213 applies a force to the transmission retaining spring 2122, the transmission retaining spring 2122 can apply a force to the slope surface of the transmission buckle 2121, so that the transmission buckle 2121 is subjected to an inclined outward force. At this time, the transmission buckle 2121 transmits the force to the second seal 211, so that the second seal 211 is subjected to an inclined outward force, thereby making the inner ring of the second seal 211 have an outward movement tendency, so as to reduce the clamping effect of the second seal 211 on the coal powder sampling pipe 31 or the sleeve 12, so as to facilitate the sealing joint 2 to detach from the coal powder sampling pipe 31 or the sleeve 12.

[0057] In some embodiments, in combination Figures 2 to 4 As shown, the operating member 213 includes a release 2131, one end of which extends into the interior of the sealing joint 2 to apply a force to the transmission retaining spring 2122, and the other end of the release 2131 extends out of the sealing joint 2 for operation by the staff. In order to increase the convenience of operation by the staff, the extended end of the release 2131 extends in a direction perpendicular to the axis of the release 2131. The outer periphery of the end of the release 2131 extending into the interior of the sealing joint 2 is provided with a slope surface, and the cross section of the transmission retaining spring 2122 is bent so that the outer ring and the inner ring of the transmission retaining spring 2122 are both formed with a slope surface, and the outer ring of the transmission retaining spring 2122 is supported on the inner wall of the sealing joint 2. Specifically, the outer ring of the transmission retaining spring 2122 can be directly supported on the inner wall of the sealing joint 2, or can be supported on the inner wall of the sealing joint 2 by other structures, and can be designed according to actual needs.

[0058] The inner ring of the transmission clamp spring 2122 is wedge-matched with the slope surface of the release 2131, and the inner ring end of the transmission clamp spring 2122 is supported on the slope surface of the transmission buckle 2121. In this design, when the staff pushes the release 2131, the slope surface of the release 2131 will push the slope surface of the inner ring of the transmission clamp spring 2122, thereby causing the inner ring of the transmission clamp spring 2122 to tilt, so that the inner ring end of the transmission clamp spring 2122 can tilt outward to push the transmission buckle 2121, and when the external force disappears, the transmission clamp spring 2122 is reset, and the release 2131 is pushed out under the action of elastic force, which is convenient for operation.

[0059] In some embodiments, the sealing assembly 21 also includes a limit block 214, which is arranged on the inner wall of the sealing joint 2, the outer ring of the transmission retaining ring 2122 is supported on the limit block 214, the outer periphery of the release 2131 is provided with a limit groove 2132, and the inner ring of the limit block 214 is provided with a limit slider 2141 that slides with the limit groove 2132.

[0060] Specifically, the shape of the limit block 214 is not limited. In one embodiment of the present application, the inner and outer sides of the end of the limit block 214 facing the transmission buckle 2121 are both provided with sloped surfaces. Accordingly, the outer periphery of the transmission buckle 2121 is provided with a sloped surface matching the inner side of the end of the limit block 214, and the inner wall of the installation groove 22 is provided with a sloped surface matching the outer side of the end of the limit block 214, so as to increase the tightness of the installation and the accuracy of positioning of the sealing assembly 21. The inner side of the limit block 214 is provided with a step surface, and the outer ring of the transmission retaining spring 2122 is supported on the inner step surface of the limit block 214 to increase the supporting effect on the transmission retaining spring 2122. The limiting groove 2132 has a certain width along the axial direction of the release 2131, and the limiting slider 2141 is slidably set in the limiting groove 2132, and the limiting slider 2141 can move along the axial direction of the release 2131 relative to the limiting groove 2132, so that the release 2131 can move along its own axial direction, and the movement range of the release 2131 is limited by the cooperation between the limiting slider 2141 and the limiting groove 2132, so as to prevent the release 2131 from being separated from the sealing joint 2.

[0061] The coal powder sampling device provided by the present invention is convenient to install and disassemble, and can be used as a standard component of a portable powder sampling device. The sealing joint 2 has structures such as a second sealing member 211, a transmission buckle 2121, a transmission retaining spring 2122, and a release 2131. The working process is that when the coal powder sampling pipe 31 and the sleeve 12 of the corresponding diameter to the sealing joint 2 are inserted into the sealing joint 2, the coal powder sampling pipe 31 or the sleeve 12 first pushes the transmission retaining spring 2122 inward to reach the second sealing member 211. The second sealing member 211 can be a sealing ring, the diameter of which is slightly smaller than the diameter of the coal powder sampling pipe 31 and the sleeve 12, and is made of a softer rubber material. The sealing ring expands and deforms outward under the action of the force of the hand pushing the coal powder sampling pipe 31 or the sleeve 12. When the sealing joint 2 is installed with the coal dust sampling pipeline 31 and the sleeve 12, the deformed sealing ring is in close contact with the pipe wall of the coal dust sampling pipeline 31 and the sleeve 12, and because there is gas flow inside, the air pressure enters the gas gathering groove 2111 to generate an extrusion force on the sealing ring component, so that a good sealing effect is formed between the sealing ring inside the sealing joint 2 and the interface. The pneumatic pressure borne by the sealing ring is transmitted to the sealing joint 2 through the transmission buckle 2121, the transmission spring 2122 and the release 2131. To disconnect the sealing joint 2 from the coal dust sampling pipeline 31 or the sleeve 12, firstly, it is necessary to press the release 2131 from the outside to the inside, and the force of the release 2131 is transmitted to the sealing ring through the transmission spring 2122 and the transmission buckle 2121. After the sealing ring is subjected to the force from the outside, its inner ring (inclined portion 2112) expands, and after breaking away from the contact with the coal dust sampling pipeline 31 and the sleeve 12, the coal dust sampling pipeline 31 or the sleeve 12 can be easily removed. The coal powder sampling device can provide a closed environment for the coal powder sampling pipeline 31 and the sampling gun assembly 1 to ensure that no coal powder leakage occurs during the entire sampling process.

[0062] In some embodiments, in combination Figure 3 and Figure 4 As shown, a sealing groove 14 is formed between the sleeve 12 and the gun barrel 11 , a first sealing member 13 is disposed in the sealing groove 14 , and an outer diameter of the gun barrel 11 is greater than an inner diameter of the first sealing member 13 .

[0063] Specifically, the sealing groove 14 is provided on the inner wall of the sleeve 12, and the first sealing member 13 is provided in the sealing groove 14. Since the outer diameter of the gun barrel 11 is larger than the inner diameter of the first sealing member 13, when the gun barrel 11 passes through the sleeve 12, the gun barrel 11 will squeeze the first sealing member 13, so that the first sealing member 13 is deformed so as to be able to be sleeved on the outer periphery of the gun barrel 11, thereby achieving close contact between the first sealing member 13, the sleeve 12 and the gun barrel 11.

[0064] The present application designs a sleeve 12 with a first seal 13, in which the gun barrel 11 can freely make smooth reciprocating motion. The sleeve 12 is made of a material with high strength and wear resistance, and is suitable for harsh environments such as high pressure and high temperature. Metal materials such as stainless steel and carbon steel can be used, and composite materials combining polypropylene, polyurethane and metal can also be used. The first seal 13 can be an O-ring, which is an annular sealing element made of rubber. Relying on the elasticity of its material, a certain pressure is formed between the annular seal and the sealed component, thereby preventing gas and solid particle media from leaking. During the installation process, the two ends of the O-ring are respectively pressed against the sealing surface, causing the seal to undergo elastic deformation and fill the sealing gap. When the fluid medium passes through the seal, pressure is generated on the O-ring, causing it to further deform, thereby forming a stable contact pressure on the sealing surface to achieve a sealing effect.

[0065] In some embodiments, Figure 1 As shown, the exhaust end of the gun barrel 11 is connected to a coal powder collecting assembly 4 , and the coal powder collecting assembly 4 includes an exhauster 41 and a cyclone separator 43 .

[0066] The air extractor 41 is connected to the air extraction end of the gun barrel 11 through an air extraction pipe 42. The air extractor 41 is a permanent component for providing negative pressure, and its structure and working principle are not described in detail. In the present application, under the action of the air extractor 41, the coal powder in the coal powder conveying pipe 3 will flow out to the cyclone separator 43 through the coal powder sampling pipe 31 and the gun barrel 11. The air extraction pipe 42 can be a hose to facilitate the adjustment of the component installation position.

[0067] The cyclone separator 43 is connected to the exhaust pipe 42. The cyclone separator 43 is a device that uses centrifugal force to separate solid particles or liquid droplets in the airflow. It is a conventional technology in the art, and its structure and working principle are not described in detail here. In the present application, the cyclone separator 43 is used to separate the coal sample so that the coal sample can be collected for subsequent operations.

[0068] In some embodiments, Figure 1 As shown, a sampling port 111 is provided at the sampling end of the gun barrel 11, and the sampling port 111 is opened toward the conveying direction of the coal powder.

[0069] Specifically, the gun barrel 11 is inserted into the coal powder conveying pipe 3 along an axial direction perpendicular to the coal powder conveying pipe 3. At this time, when the coal powder in the coal powder conveying pipe 3 is transferred from top to bottom, the sampling port 111 will be set upward, so that the coal powder can smoothly enter the gun barrel 11.

[0070] In some embodiments, a pressure gauge 44 is further provided at the air extraction end of the gun barrel 11 to record the pressure value of the incoming coal powder airflow through the pressure gauge 44. The pressure gauge 44 may be a U-shaped pressure gauge 44, etc., and may be designed according to actual needs.

[0071] The use process of the coal powder sampling device provided by the present invention is as follows:

[0072] Before starting sampling, preparations need to be completed. First, connect the gun barrel 11, cyclone separator 43, and vacuum pump 41 through the exhaust pipe 42. Then, connect the coal powder sampling pipe 31 and the sleeve 12 through the two ends of the sealing joint 2. When the coal powder sampling pipe 31 and the sleeve 12 are inserted into the sealing joint 2 for connection, the coal powder sampling pipe 31 and the sleeve 12 first push open the transmission retaining ring 2122 inward to reach the second seal 211. The diameter of the second seal 211 is slightly smaller than the diameter of the coal powder sampling pipe 31 and the sleeve 12, and is made of softer rubber. The second seal 211 expands and deforms outward under the force of the hand pushing the coal powder sampling pipe 31 and the sleeve 12. When the pipeline is installed, the deformed sealing ring is in close contact with the pipe wall. After the connection is stable, insert the gun barrel 11 into the center hole of the sleeve 12 and extend it to the ball valve 32. Finally, open the ball valve 32 and further extend the gun barrel 11 to the center of the airflow in the coal powder conveying pipe 3. During the extension of the gun barrel 11, a corresponding mark should be made on the direction of the sampling port 111 to ensure that the sampling port 111 faces the direction of the coal powder flow.

[0073] During formal sampling, gas flows inside the coal powder sampling pipe 31, the sleeve 12, and the sealing joint 2. The extrusion force generated by the air pressure on the second sealing member 211 on the sealing joint 2 forms a good sealing effect between the second sealing member 211 and the interface inside the sealing joint 2. The pneumatic pressure borne by the second sealing member 211 is transmitted to the shell of the sealing joint 2 through the transmission buckle 2121, the transmission spring 2122, and the release 2131. When the gun barrel 11 extends to the center of the air flow of the coal powder conveying pipe 3, the vacuum pump 41 is turned on. Under the action of the suction force of the vacuum pump 41, the coal powder airflow passes through the gun barrel 11 and the air extraction pipe 42 into the cyclone separator 43. The cyclone separator 43 can separate the coal powder particles and the gas, so that the gas is discharged through the vacuum pump 41, and the coal powder particles are collected in the sample bottle of the cyclone separator 43. During the sampling process, the coal powder will leak from the gap between the ball valve 32 and the barrel 11, but the second seal 211 of the sealing joint 2 and the first seal 13 of the sleeve 12 together create a closed area to prevent the coal powder from leaking to the environment. During the coal powder sampling process, the pressure value of the incoming coal powder airflow can be recorded by the U-shaped pressure gauge 44.

[0074] After sampling is completed, the vacuum pump 41 is closed, the gun barrel 11 is pulled outward to the outlet of the ball valve 32, and the ball valve 32 is closed. The release button 2131 of the sealing joint 2 connected to the coal powder sampling pipeline 31 is pressed, and the force of the release button 2131 is transmitted to the second sealing member 211 through the transmission clamp spring 2122 and the transmission buckle 2121. After the second sealing member 211 is subjected to the external force, its inner circle expands, and after it is out of contact with the coal powder sampling pipeline 31, the coal powder sampling device connected to the sleeve 12 on the other side of the sealing joint 2 can be pulled out as a whole.

[0075] In the pulled-out coal powder sampling device, there will be coal powder deposited during the sampling process. After dumping the deposited coal powder, external compressed air is used to clean the sealing joint 2 to prevent coal powder particles from adhering to the components of the sealing joint 2 for a long time, affecting the smoothness of the equipment operation and further affecting the sealing performance of the sealing joint 2. After the coal powder sampling device is cleaned, the above coal powder sampling method is repeated to carry out the coal powder sampling work of the next coal powder conveying pipe 3.

[0076] It should be noted that, in this article, relational terms such as "first" and "second" are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "comprise a ..." do not exclude the existence of other identical elements in the process, method, article or device including the elements.

[0077] The above description is only a specific embodiment of the present invention, so that those skilled in the art can understand or implement the present invention. Various modifications to these embodiments will be obvious to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments described herein, but should conform to the widest scope consistent with the principles and novel features of the present invention.

Claims

1. A coal powder sampling device, characterized in that: include: A sampling gun assembly (1) comprises a gun barrel (11) and a sleeve (12) sleeved on the outer circumference of the gun barrel (11), wherein a first sealing member (13) is provided between the gun barrel (11) and the sleeve (12); A sealing joint (2), wherein inner walls at both ends are respectively provided with sealing components (21), wherein one of the sealing components (21) is used to be sleeved on the outer periphery of the coal powder sampling pipeline (31), and the other sealing component (21) is used to be sleeved on the outer periphery of the sleeve (12); Wherein, the sealing assembly (21) comprises a second sealing member (211), and a gas gathering groove (2111) is provided on one side of the second sealing member (211) facing the center direction of the sealing joint (2).

2. The coal powder sampling device according to claim 1, characterized in that: The side of the second sealing member (211) provided with the gas gathering groove (2111) is inclined inwardly to form an inclined portion (2112), and the inclined portion (2112) is used to contact the outer periphery of the coal powder sampling pipeline (31) or the outer periphery of the sleeve (12).

3. The coal powder sampling device according to claim 2, characterized in that: The inner side of the gas gathering groove (2111) is concave inwardly toward the axial direction of the second sealing member (211) to form a wind ring (2113).

4. The coal powder sampling device according to claim 1, characterized in that: The sealing assembly (21) further comprises a transmission member (212) and an operating member (213); the operating member (213) can push the second sealing member (211) to move through the transmission member (212), so that the inner ring of the second sealing member (211) can be retracted or expanded.

5. The coal powder sampling device according to claim 4, characterized in that: The transmission member (212) comprises: A transmission buckle (2121) is arranged on a side of the second sealing member (211) away from the center direction of the sealing joint (2), and the transmission buckle (2121) is snap-connected to the second sealing member (211); A transmission clamping spring (2122) is arranged on a side of the transmission buckle (2121) away from the second sealing member (211), and the transmission clamping spring (2122) is connected to the operating member (213); Wherein, a slope surface is provided on the inner side of one end of the transmission buckle (2121) facing the transmission clamping spring (2122), and the transmission clamping spring (2122) is supported on the slope surface of the transmission buckle (2121).

6. The coal powder sampling device according to claim 5, characterized in that: The operating member (213) comprises a release (2131), one end of the release (2131) extends into the interior of the sealing joint (2), and the other end extends out of the sealing joint (2); a slope surface is provided on the outer periphery of the end of the release (2131) extending into the interior of the sealing joint (2); the cross section of the transmission retaining spring (2122) is bent; the outer ring of the transmission retaining spring (2122) is supported on the inner wall of the sealing joint (2); the inner ring of the transmission retaining spring (2122) is wedge-matched with the slope surface of the release (2131), and the inner ring end of the transmission retaining spring (2122) is supported on the slope surface of the transmission retaining spring (2121).

7. The coal powder sampling device according to claim 6, characterized in that: The sealing assembly (21) further comprises a limit block (214), wherein the limit block (214) is arranged on the inner wall of the sealing joint (2), the outer ring of the transmission retaining spring (2122) is supported on the limit block (214), the outer periphery of the release (2131) is provided with a limit sliding groove (2132), and the inner ring of the limit block (214) is provided with a limit sliding block (2141) which is slidably matched with the limit sliding groove (2132).

8. The coal powder sampling device according to claim 1, characterized in that: A sealing groove (14) is formed between the sleeve (12) and the gun barrel (11), the first sealing member (13) is arranged in the sealing groove (14), and the outer diameter of the gun barrel (11) is greater than the inner diameter of the first sealing member (13).

9. The coal powder sampling device according to claim 1, characterized in that: The sealing joint (2) is provided with mounting grooves (22) at both ends, the two sealing assemblies (21) are respectively arranged in the two mounting grooves (22), and the step surfaces of the two mounting grooves (22) are respectively used to abut against the end of the coal powder sampling pipeline (31) and the end of the sleeve (12), and a guide block (221) is provided on the step surface of the mounting groove (22), and the guide block (221) is extended toward the gas gathering groove (2111).

10. The coal powder sampling device according to claim 1, characterized in that: The air extraction end of the gun barrel (11) is connected to a coal powder collecting assembly (4), and the coal powder collecting assembly (4) comprises: An air extractor (41) is connected to the air extraction end of the gun barrel (11) via an air extraction pipeline (42); A cyclone separator (43) connected to the air extraction pipeline (42); And / or, a sampling port (111) is provided at the sampling end of the gun barrel (11), and the sampling port (111) is opened toward the conveying direction of the coal powder.

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