Pulverized coal sampling device for boiler

Abstract

The invention relates to a pulverized coal sampling device for a boiler, the outer side of a supporting rod is slidably connected with a supporting ring, one side of the supporting ring is connected with a connecting ring, the connecting ring is provided with a mounting ring, and the supporting ring is connected with the rear end of the supporting rod through an elastic assembly; the multiple sets of sampling spoons are arranged at the front end of the supporting rod in an annular array mode, the top sides of the sampling spoons are rotationally connected with cover plates used for closing openings in the outer sides of the sampling spoons, and the rear ends of the cover plates are connected with mounting blocks through connecting rod assemblies and used for controlling opening and closing of the cover plates. The cover plate of the sampling spoon can be opened and closed only through simple stirring and pulling operation, complex operation procedures are not needed, the convenience and efficiency of sampling operation are greatly improved, the automatic closing function of the cover plate can effectively prevent a pulverized coal sample from falling or scattering in the taking-out process, and the integrity of the sample is ensured; during detection, a single sample can be independently taken out, and cross contamination among different samples is avoided.

Description

Technical Field

[0001] This invention relates to the field of pulverized coal sampling technology, and specifically to a pulverized coal sampling device for boilers. Background Technology

[0002] Boilers, as important heat energy conversion equipment, are widely used in power, chemical, heating and other fields. During boiler combustion, precise control of pulverized coal quality is crucial, and pulverized coal sampling, as a key preliminary step in testing pulverized coal quality, directly affects boiler combustion efficiency and production safety due to its ease of operation, sample integrity, and testing accuracy.

[0003] Existing sampling devices lack an effective automatic cover closure mechanism during sampling. Coal powder samples are prone to falling or spilling due to shaking or collisions during extraction, resulting in sample loss and incompleteness, affecting the accuracy of subsequent test results. To improve data reliability and representativeness, reduce random errors, and ensure that coal powder samples truly reflect the characteristics of the entire material flow, multiple samplings from the same sampling point are necessary. For example, the "Coal Powder Sampling Device for Thermal Power Plant Boilers" disclosed in patent number CN118392574B uses a circumferentially distributed conical box and a pull rod sealing structure to achieve multiple coal powder samples in one sampling while preventing spillage, thus solving the problem of discontinuous data from multiple samplings.

[0004] In multi-sample testing scenarios, traditional devices struggle to accurately separate and independently extract individual samples, and cross-contamination between different samples is highly likely, further reducing the reliability of test results and failing to meet the demands of industrial production for precise coal powder quality testing. Therefore, there is an urgent need to design a novel coal powder sampling device for boilers to address these issues. Summary of the Invention

[0005] To address the shortcomings of existing technologies, this invention provides a pulverized coal sampling device for boilers to solve the aforementioned problems.

[0006] This invention provides the following technical solution: A pulverized coal sampling device for boilers, comprising: A support rod, wherein a support ring is slidably connected to the outer side of the support rod along its length direction, a connecting ring is connected to one side of the support ring, an mounting ring is provided on the upper part of the connecting ring, and the support ring is connected to the rear end of the support rod through an elastic component; A sampling spoon, with multiple sets of the sampling spoons arranged in a circular array at the front end of the support rod, and a cover plate for closing the outer opening of the sampling spoon is rotatably connected to the top side of the sampling spoon. The rear end of the cover plate is connected to a mounting block through a connecting rod assembly to control the opening and closing of the cover plate. The outer wall of the mounting block is connected to a mounting ring through a mounting assembly. The handle has a fixed plate fixedly connected to the middle of its front side. The inner wall of the fixed plate is detachably snapped together by a limiting component and a support ring to control the position of the support ring.

[0007] Preferably, the linkage assembly includes a connecting block fixedly connected to the outer wall of the rear end of the cover plate, and a curved connecting rod rotatably connected to the rear end of the connecting block, the rear end of which is rotatably connected to the outer wall of the mounting block.

[0008] Preferably, the mounting assembly includes a limiting shaft slidably connected to both sides of the mounting block, a slot is provided on the outer wall of the mounting ring, a second spring is provided inside the mounting block, the limiting shaft tends to be inserted into the slot under the elastic force of the second spring, and a paddle is fixedly connected to the outer wall of the limiting shaft.

[0009] Preferably, the limiting component includes an inclined insert block fixedly connected to the bottom side of the support ring, a support shaft fixedly connected to the inner wall of the fixing plate, and an inclined top block slidably connected to the outer wall of the support shaft, wherein the inclined insert block and the inclined top block are engaged.

[0010] Preferably, the outer wall of the support shaft is provided with a spring three, and the outer wall of the inclined top block is fixedly connected with a hook for controlling the lifting and lowering of the inclined top block.

[0011] Preferably, the elastic component includes a spring sleeved on the outer wall of the support rod, one end of the spring being connected to the outer wall of the fixing ring, and the other end of the spring being connected to the outer wall of the support ring.

[0012] Preferably, the sampling method includes the following steps: Step 1: By moving the inclined plate, the support ring is compressed and the spring is stored to store elastic potential energy. The inclined plate is then stuck on the outer wall of the top inclined plate, thereby opening the cover plate from the opening of the sampling spoon. Step 2: Insert the sampling spoon into the sampling point. After the coal powder enters the inside of the sampling spoon, pull the hook to cover the opening of the sampling spoon with the cover plate to prevent the coal powder sample from falling out. Step 3: By moving the lever of the corresponding sampling spoon, remove the mounting block from the outer wall of the mounting ring, and then pull the mounting block to open the cover at the opening of the sampling spoon to remove the corresponding sample.

[0013] Preferably, in step one, the inclined top block is clamped onto the outer wall of the inclined insert block by the compression and reset of the spring three.

[0014] Preferably, in step two, the pulling hook causes the inclined top block to compress the spring three, causing the inclined top block and the inclined insert block to separate. The compressed spring one releases its elastic potential energy to push the bending connecting rod forward and cover the opening of the sampling spoon with the cover plate.

[0015] Preferably, in step three, the actuating paddle causes the limiting shafts on both sides to compress the second spring, at which point the limiting shafts disengage from the slots on the inner wall of the mounting ring.

[0016] Preferably, the sampling spoon includes a spoon body and a spoon lid, the spoon lid is detachably installed on the front opening of the spoon body to close the front opening of the spoon body, and the spoon lid and the cover plate are magnetically attached to each other.

[0017] Preferably, a snap-fit ​​protrusion is provided on one side of the spoon body, and a snap-fit ​​groove adapted to the snap-fit ​​protrusion is provided on the front side wall of the spoon body.

[0018] Preferably, the spoon body has an inner space, and a snap-fit ​​rotating rod is rotatably connected in the inner space. A limit groove is provided on one side of the snap-fit ​​protrusion, and the snap-fit ​​rotating rod is configured as a hook that cooperates with the limit groove. The snap-fit ​​rotating rod and the limit shaft are linked by a linkage component, which drives the hook of the snap-fit ​​rotating rod to insert into or withdraw from the limit groove.

[0019] Preferably, the linkage component includes a top block and a spring five disposed in a slot of the mounting ring. The spring five pushes the top block to move outward. The top block and the end of the locking rod away from the hook are connected by a pull rope. A spring four is connected between the locking rod and the inner sidewall of the inner space.

[0020] The present invention has the following beneficial technical effects: This invention utilizes the combination of a sloping insert block, a sloping top block, a spring, and a connecting rod assembly to open and close the sampling spoon cover with simple flicking and pulling operations. This eliminates the need for complex operating procedures, greatly improving the convenience and efficiency of sampling operations and reducing the workload of operators.

[0021] During the sampling process, the automatic closing function of the cover plate can effectively prevent coal powder samples from falling or spilling during extraction, ensuring sample integrity. At the same time, during testing, the design of the limiting shaft and mounting ring can precisely control the opening of the cover plate, enabling the independent extraction of individual samples, avoiding cross-contamination between different samples, and ensuring the accuracy of test results. Attached Figure Description

[0022] Figure 1 This is a perspective view of the present invention; Figure 2 This is a schematic diagram of the support ring structure of the present invention; Figure 3 for Figure 2 Enlarged view of point A in the image; Figure 4 This is a schematic diagram of the sampling spoon structure of the present invention; Figure 5 This is a schematic diagram of the fixing ring structure of the present invention; Figure 6 for Figure 5 Enlarged view of point B in the image; Figure 7 This is a schematic diagram of the sampling spoon structure in Embodiment 2 of the present invention; Figure 8 This is a schematic diagram of the sampling spoon and cover plate in embodiment two of the present invention; Figure 9 This is a schematic diagram of the engagement of the snap-fit ​​protrusion and the snap-fit ​​rotating rod in Embodiment 2 of the present invention; Figure 10 for Figure 9 Enlarged view of point C in the image.

[0023] The attached figures are labeled as follows: 1. Support rod; 2. Fixing ring; 3. Connecting ring; 4. Spring 1; 5. Mounting ring; 6. Support ring; 7. Angled insert block; 8. Fixing plate; 9. Mounting block; 10. Bending connecting rod; 11. Sampling spoon; 111. Spoon body; 112. Spoon cover; 113. Snap-fit ​​protrusion; 114. Limiting groove; 115. Inner space; 116. Snap-fit ​​rotating rod; 117. Spring 4; 12. Cover plate; 13. Hook; 14. Limiting shaft; 15. Paddle; 16. Spring 2; 17. Angled top block; 18. Spring 3; 19. Support shaft; 20. Handle; 21. Top block; 22. Spring 5; 23. Pull rope. Detailed Implementation

[0024] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0025] Example 1: A pulverized coal sampling device for boilers, such as Figures 1-6 : A support rod 1 is slidably connected to a support ring 6 at its middle end. A connecting ring 3 is fixedly connected to the front side of the support ring 6. An installation ring 5 is fixedly connected to the front end of the connecting ring 3. A spring 4 is fixedly connected to the rear end of the support rod 1. The outer wall of the support rod 1 is provided with a spring 4. One end of the spring 4 is connected to the outer wall of the fixing ring 2, and the other end of the spring 4 is connected to the outer wall of the support ring 6. The inner walls of the connecting ring 3 and the support rod 1 are both provided on the outer wall of the support rod 1. The support rod 1 serves as the main support structure of the device. Its middle end is designed to be slidably connected to a support ring 6, allowing the support ring 6 to slide back and forth along the axial (length) direction of the support rod 1. A connecting ring 3 is fixedly connected to the front side of the support ring 6, and the front end of the connecting ring 3 is further fixedly connected to a mounting ring 5, forming a sequentially connected structural system. A spring 4 is sleeved on the outer wall of the support rod 1, with one end connected to the outer wall of the fixing ring 2 fixed to the rear end of the support rod 1, and the other end connected to the outer wall of the support ring 6. When the support ring 6 slides on the support rod 1, it compresses or stretches the spring 4, thereby storing and releasing elastic potential energy. The inner walls of both the connecting ring 3 and the mounting ring 5 are tightly fitted to the outer wall of the support rod 1, ensuring the stability of the connection while not affecting the sliding of the support ring 6 on the support rod 1.

[0026] Multiple sets of sampling spoons 11 are provided. In this embodiment, three sets are used. The three sets of sampling spoons 11 are arranged in a ring around the axis of the support rod 1. The sampling spoons 11 are designed with an outer opening along the radial direction of the support rod 1 for collecting coal powder samples. The sampling spoons 11 are fixedly connected to the front end of the support rod 1. The top side of the sampling spoons 11 is rotatably connected to a cover plate 12. A connecting block is fixedly connected to the outer wall of the rear end of the cover plate 12. The rear end of the connecting block is rotatably connected to a bent connecting rod 10. The rear end of the bent connecting rod 10 is rotatably connected to the outer wall of the mounting block 9 to control the opening and closing of the cover plate 12. Limiting shafts 14 are slidably connected to both sides of the mounting block 9. The outer wall of the mounting ring 5 is provided with a slot. The limiting shaft 14 is located inside the slot. A spring 16 is provided inside the mounting block 9. A paddle 15 is fixedly connected to the outer wall of the limiting shaft 14. The rotation of the cover plate 12 enables the opening and closing of the sampling spoon 11. A connecting block is fixedly connected to the outer wall of the rear end of the cover plate 12. The rear end of the connecting block is rotatably connected to the bending connecting rod 10. The rear end of the bending connecting rod 10 is rotatably connected to the outer wall of the mounting block 9. When the position of the mounting block 9 changes, the cover plate 12 is driven to rotate through the transmission of the bending connecting rod 10. The connection and disassembly of the mounting block 9 and the mounting ring 5 are achieved through the limiting shaft 14 slidably connected to both sides of the mounting block 9. The outer wall of the mounting ring 5 has a slot that matches the limiting shaft 14, allowing the limiting shaft 14 to be inserted into the slot, thus fixing the mounting block 9 and the mounting ring 5. The mounting block 9 has a second spring 16 inside, which is used to push the limiting shaft 14 into the slot to ensure the reliability of the connection. The outer wall of the limiting shaft 14 is fixedly connected to a lever 15. By moving the lever 15, the limiting shaft 14 can be driven to compress the second spring 16, causing the limiting shaft 14 to disengage from the slot, thereby achieving the disassembly of the mounting block 9 and the mounting ring 5, which facilitates the subsequent removal and testing of coal powder from the corresponding sampling spoon 11.

[0027] A fixing plate 8 is fixedly connected to the middle of the front side of the handle 20, and an inclined block 7 is fixedly connected to the bottom side of the support ring 6. A support shaft 19 is fixedly connected to the inner wall of the fixing plate 8, and an inclined top block 17 is slidably connected to the outer wall of the support shaft 19 to control the position of the support ring 6. A spring 18 is provided on the outer wall of the support shaft 19, and a hook 13 is fixedly connected to the outer wall of the inclined top block 17 to control the lifting and lowering of the inclined top block 17. A fixing plate 8 is fixedly connected to the middle of the front side of the handle 20. The fixing plate 8 is used to limit the inclined insert 7 to control the position of the support ring 6. The inclined insert 7 is fixedly connected to the bottom side of the support ring 6. The inner wall of the fixing plate 8 is fixedly connected to the support shaft 19. The outer wall of the support shaft 19 is slidably connected to the inclined top block 17. The inclined surfaces of the inclined insert 7 and the inclined top block 17 cooperate with each other. When the inclined insert 7 moves, it can contact the inclined top block 17 and push it to slide on the support shaft 19. The outer wall of the support shaft 19 is provided with a spring 18. The spring 18 is used to push the inclined top block 17 to reset, so that the inclined top block 17 can lock the inclined insert 7, thereby fixing the position of the support ring 6. The outer wall of the inclined top block 17 is fixedly connected to a hook 13. By pulling the hook 13, the inclined top block 17 can be driven to slide on the support shaft 19, realizing the control of the lifting and lowering of the inclined top block 17, thereby releasing the locked state of the inclined insert 7.

[0028] The sampling method for pulverized coal used in boilers includes the following steps: Step 1: By moving the inclined insert 7, the support ring 6 is compressed and the spring 4 is compressed to store elastic potential energy, and the inclined insert 7 is stuck on the outer wall of the inclined top block 17, thereby opening the cover plate 12 from the opening of the sampling spoon 11. In Step 1, the inclined top block 17 is stuck on the outer wall of the inclined insert 7 by the compression and reset of the spring 3 18. Holding handle 20, by moving the inclined insert 7, the support ring 6 moves backward on the support rod 1, compressing spring 4 and storing elastic potential energy. During the backward movement of the inclined insert 7, its inclined surface contacts the inclined surface of the inclined top block 17, pushing the inclined top block 17 downward along the support shaft 19, compressing spring 3 18. When the inclined insert 7 reaches a certain position, spring 3 18 returns to its original position, pushing the inclined top block 17 upward, locking it against the outer wall of the inclined insert 7, thus fixing the position of the support ring 6. At this time, the backward movement of the support ring 6, through the connecting ring 3 and the mounting ring 5, causes the mounting block 9 to move backward. The mounting block 9, through the transmission of the bending connecting rod 10, opens the cover plate 12 from the opening of the sampling spoon 11, preparing for sampling.

[0029] Step 2: Insert the sampling spoon 11 into the sampling point. After coal powder enters the inside of the sampling spoon 11, pull the hook 13 to cover the opening of the sampling spoon 11 with the cover plate 12 to prevent the sample coal powder from falling out. In Step 2, pulling the hook 13 causes the inclined top block 17 to compress the spring 3 18, causing the inclined top block 17 and the inclined insertion block 7 to separate. The compressed spring 4 releases its elastic potential energy to push the bending connecting rod 10 forward and cover the opening of the sampling spoon 11 with the cover plate 12. Insert the sampling spoon 11 into the sampling point. After the inside of the sampling spoon 11 is filled with coal powder, pull the hook 13 to drive the inclined top block 17 to slide down along the support shaft 19, compressing the spring 18 and causing the inclined top block 17 and the inclined insertion block 7 to separate. At this time, the compressed spring 4 releases its elastic potential energy, pushing the support ring 6 to move forward on the support rod 1. The forward movement of the support ring 6 drives the mounting block 9 to move forward through the connecting ring 3 and the mounting ring 5. The mounting block 9, through the transmission of the bending connecting rod 10, covers the opening of the sampling spoon 11 with the cover plate 12 to prevent the sample coal powder from falling out during the extraction process.

[0030] Step 3: By moving the lever 15 of the corresponding sampling spoon 11, the mounting block 9 is removed from the outer wall of the mounting ring 5. Then, the mounting block 9 is pulled to open the cover plate 12 at the opening of the sampling spoon 11, so as to take out the corresponding sample. In step 3, moving the lever 15 causes the limiting shafts 14 on both sides to compress the spring 16. At this time, the limiting shafts 14 are disengaged from the slots on the inner wall of the mounting ring 5. When testing the sampled coal powder, locate the corresponding lever 15 of the sampling spoon 11, and move the lever 15 to drive the limiting shafts 14 on both sides to slide within the mounting block 9. This compresses the spring 16, causing the limiting shafts 14 to disengage from the slots on the inner wall of the mounting ring 5, thereby removing the mounting block 9 from the outer wall of the mounting ring 5. After removing the mounting block 9, pull it. Through the transmission of the bending connecting rod 10, the cover plate 12 opens at the opening of the sampling spoon 11, allowing the corresponding sample to be removed for subsequent testing.

[0031] Example 2: Contains all the contents of Example 1, except that, as Figure 3 , Figures 7-10 : like Figure 3 As shown, the slot of the mounting ring 5 is also equipped with a top block 21 and a spring 22. The elastic force of the spring 22 is less than that of the spring 16. Thus, under normal conditions, the elastic force of the spring 16 pushes the limiting shaft 14 into the slot, and the limiting shaft 14 compresses the spring 22 through the top block 21.

[0032] like Figure 7The sampling spoon 11 includes a spoon body 111 and a spoon cover 112. The spoon cover 112 is located at the front end of the spoon body 111. The spoon body 111 has an outer opening in the radial direction of the support rod 1 and a front opening in the axial direction of the support rod 1. The spoon cover 112 is adapted to the front opening of the spoon body 111 for opening and closing the front opening of the spoon body 111.

[0033] like Figure 8 As shown, the spoon lid 112 and the cover plate 12 are magnetically engaged, and a limit post and limit hole structure (not shown in the attached figure) are provided between the spoon lid 112 and the cover plate 12 to maintain the position as shown in the figure under normal conditions. Figure 8 The state is shown in the left-hand image.

[0034] like Figure 9 , Figure 10 As shown, the side of the spoon lid 112 that contacts the spoon body 111 has a protruding snap-fit ​​protrusion 113, and the side of the spoon body 111 that contacts the spoon body has a recessed snap-fit ​​groove that matches the snap-fit ​​protrusion 113. A channel is provided between the spoon body 111 and the corresponding slots, and a pull rope 23 is built into the channel. An inner space 115 is opened in the spoon body 111 that communicates with the snap-fit ​​groove and the channel. The middle part of the snap-fit ​​rotating rod 16 is rotatably connected in the inner space 115, and the lower end of the snap-fit ​​rotating rod 16 is connected to one end of the pull rope 23, and the other end of the pull rope 23 is connected to the top block 21. The end of the locking lever 16 facing away from the pull rope 23 is provided with a hook, and the side wall of the locking protrusion 113 has a limiting groove 114 that matches the hook at one end of the locking lever 16. A spring 117 is provided between the end of the locking lever 16 with the hook and the inner space 115.

[0035] Working principle: Before the sampling device is inserted into the boiler for sampling, the spoon cover 112 is magnetically attached and fixed to the side wall of the cover plate 12, such as Figure 8 As shown in the left-hand diagram, the radial opening and the front side wall opening of the spoon body 111, along with the simultaneous openings on adjacent sides, facilitate sampling. After sampling, the cover plate 12 closes onto the open side of the sampling spoon 11 (i.e., the radial opening side of the spoon body 111), and at the same time, the spoon lid 112 closes onto the opening on the front side wall of the spoon body 111. Figure 8 As shown in the middle diagram, at this time, the snap-fit ​​protrusion 113 of the spoon lid 112 is inserted into the snap-fit ​​groove.

[0036] After sampling and extraction from the boiler, pressing the lever 15 separates the mounting block 9 from the mounting ring 5. At this point, the top block 21 loses its restraint and is pushed outward to reset under the elastic force of the spring 22. The outward movement of the top block 21 drives the locking rod 116 to rotate via the pull rope 23 (as shown). Figure 10The hook at one end of the locking lever 116 rotates counterclockwise and inserts into the limiting groove 114 of the locking protrusion 113, thus preventing the locking protrusion 113 from being pulled out of the locking groove. At this time, the cover plate 12 rotates and disengages from the opening side (i.e., the radial opening side of the spoon body 111) of the sampling spoon 11 to open. At this time, the locking protrusion 113 is restricted and locked in the locking groove, so that the spoon cover 112 is in the front opening side of the closed spoon body 111, with only one side opening to prevent the sample in the sampling spoon 11 from falling out.

[0037] When connecting mounting block 9 and mounting ring 5, as follows Figure 10 As shown, under the action of spring 4 117, the hook at one end of the rotating rod 116 separates from the limiting groove 114.

[0038] The embodiments described above are merely illustrative of specific implementations of the present invention, and while the descriptions are detailed, they should not be construed as limiting the scope of the present invention. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these modifications and improvements all fall within the scope of protection of the present invention.

Claims

1. A pulverized coal sampling device for boilers, characterized in that, Include: Supporting rod (1), the supporting rod (1) outside sliding connection with support ring (6) along the length direction, the support ring (6) one side is connected with connecting ring (3), the upper of connecting ring (3) is provided with mounting ring (5), the support ring (6) is connected through elastic component and the rear end of supporting rod (1); Sampling spoon (11), a plurality of groups of the sampling spoon (11) annular array is arranged in the front end of supporting rod (1), the top side of sampling spoon (11) is rotatably connected with the cover plate (12) for closing the opening outside sampling spoon (11), the rear end of cover plate (12) is connected with mounting block (9) through connecting rod assembly, to control the opening and closing of cover plate (12), the outer wall of mounting block (9) is connected with mounting ring (5) through mounting assembly; Handle (20), the front side of handle (20) is fixedly connected with fixed plate (8), the inner wall of fixed plate (8) is detachably clamped with support ring (6) through limiting assembly, to control the position of support ring (6).

2. The coal powder sampling device for a boiler according to claim 1, characterized by The connecting rod assembly includes a connecting block fixedly connected to the rear end of the outer wall of the cover plate (12), a curved connecting rod (10) rotatably connected to the rear end of the connecting block, and an outer wall of the connecting block rotatably connected to the outer wall of the mounting block (9).

3. A coal powder sampling device for a boiler according to claim 2, characterized by The mounting assembly includes a limiting shaft (14) slidingly connected to both sides of the mounting block (9), a slot is formed in the outer wall of the mounting ring (5), a spring (16) is provided in the interior of the mounting block (9), the limiting shaft (14) tends to be inserted into the interior of the slot under the elastic force of the spring (16), and a tab (15) is fixedly connected to the outer wall of the limiting shaft (14).

4. The coal powder sampling device for a boiler according to claim 1, characterized by The limiting assembly includes an inclined surface insertion block (7) fixedly connected to the bottom side of the support ring (6), a support shaft (19) fixedly connected to the inner wall of the fixed plate (8), and an inclined surface top block (17) slidingly connected to the outer wall of the support shaft (19), and the inclined surface insertion block (7) and the inclined surface top block (17) are clamped and matched.

5. A coal powder sampling device for a boiler according to claim 4, wherein The outer wall of the support shaft (19) is provided with a spring (18), and the outer wall of the inclined surface top block (17) is fixedly connected with a hook (13) for controlling the lifting of the inclined surface top block (17).

6. The coal powder sampling device for a boiler according to claim 1, wherein The elastic component includes a spring (4) provided on the outer wall of the supporting rod (1), one end of the spring (4) is connected to the outer wall of the fixed ring (2), and the other end of the spring (4) is connected to the outer wall of the support ring (6).

7. The coal powder sampling device for a boiler according to claim 1, wherein The sampling spoon (11) includes a spoon body (111) and a spoon cover (112), the spoon cover (112) is detachably mounted on the front side of the spoon body (111) to close the front side opening of the spoon body (111), and the spoon cover (112) and the cover plate (12) are magnetically attracted.

8. A coal powder sampling device for a boiler according to claim 7, characterized by One side of the spoon body (111) protrudes a clamping protrusion (113), and the front side wall of the spoon body (111) is provided with a clamping groove matched with the clamping protrusion (113).

9. A coal powder sampling device for a boiler according to claim 8, characterized by The spoon body (111) is provided with an inner space (115), the inner space (115) is rotatably connected with a clamping rotating rod (116), the clamping protrusion (113) is provided with a limiting slot (114) on one side, the clamping rotating rod (116) is provided with a hook claw matched with the limiting slot (114), the clamping rotating rod (116) and the limiting shaft (14) are connected through a linkage assembly, and the hook claw of the clamping rotating rod (116) is inserted into or separated from the limiting slot (114).

10. The pulverized coal sampling device for a boiler according to claim 9, characterized by The linkage assembly comprises a top block (21) and a spring five (22) arranged in the insertion slot of the mounting ring (5), the spring five (22) pushes the top block (21) to move outward, the top block (21) and one end of the clamping rotating rod (116) away from the hook claw are connected through a pull rope (23), and the clamping rotating rod (116) and the inner side wall of the inner space (115) are connected with a spring four (117).

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