Pulverized coal sampling device

Abstract

The pulverized coal sampling device comprises an inner screen drum and an outer screen drum, the outer screen drum is arranged on the outer side of the inner screen drum in a sleeving mode, the inner screen drum is movably arranged in the outer screen drum in the axial direction of the inner screen drum, one end of the inner screen drum in the axial direction is open to form a feeding port, first screen holes are formed in the side wall of the inner screen drum, and the first screen holes are communicated with the feeding port. Second screen holes are formed in the side wall of the outer screen drum, and in the initial state, the first screen holes and the second screen holes are partially opposite to each other in the radial direction of the inner screen drum. The first container and the second container are arranged in the axial direction of the outer screen drum in a spaced mode, and the first container and the second container are supported on the lower side of the outer screen drum; the stirring piece is arranged in the inner screen drum, and the stirring piece comprises a rotating shaft and a spiral blade; and the elastic piece is connected between the inner screen drum and the outer screen drum in the axial direction of the inner screen drum. According to the pulverized coal sampling device, graded sampling can be conducted according to the size of pulverized coal, and the pulverized coal sampling device is simple in structure.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of coal powder sampling, in particular to a coal powder sampling device. BACKGROUND

[0002] Coal is an important energy resource, and its quality directly affects the combustion efficiency, pollutant emission and subsequent industrial production process. Accurate understanding of coal quality is of great significance to optimizing production process, improving product quality, reducing cost and reducing environmental pollution. In the process of sampling coal powder, the existing sampling device has a single sampling result, and it is difficult to perform graded sampling on coal powder of different particle sizes. SUMMARY

[0003] The present application aims to solve at least one of the technical problems existing in the prior art. To this end, the present application provides a coal powder sampling device which can perform graded sampling according to the size of the coal powder and has a simple structure.

[0004] The coal powder sampling device according to the present application comprises: an inner sieve cylinder and an outer sieve cylinder, the outer sieve cylinder is sleeved on the outer side of the inner sieve cylinder, the inner sieve cylinder is movably arranged in the outer sieve cylinder along the axial direction of the inner sieve cylinder, one end of the inner sieve cylinder is open in the axial direction to form a feeding port, a first sieve hole is formed on the side wall of the inner sieve cylinder, a second sieve hole is formed on the side wall of the outer sieve cylinder, and in the initial state, the first sieve hole and the second sieve hole are partially opposite in the radial direction of the inner sieve cylinder; a first container and a second container, the first container and the second container are arranged at intervals in the axial direction of the outer sieve cylinder, and the first container and the second container are supported on the lower side of the outer sieve cylinder; an agitator, the agitator is arranged in the inner sieve cylinder, the agitator comprises a rotating shaft and a spiral blade, the rotating shaft extends along the axial direction of the inner sieve cylinder, the spiral blade is arranged on the outer peripheral wall of the rotating shaft, and the spiral blade spirally extends around the outer peripheral wall of the rotating shaft in the axial direction of the inner sieve cylinder; and an elastic member, the elastic member is connected between the inner sieve cylinder and the outer sieve cylinder in the axial direction of the inner sieve cylinder.

[0005] In the process of pushing the coal powder by the agitator, the coal powder with smaller particles passes through the opposite parts of the first sieve hole and the second sieve hole into the first container, and the coal powder with larger particles accumulates at the rear end of the pushing direction, which makes the axial force of the inner sieve cylinder become larger and larger, so that the inner sieve cylinder generates displacement by overcoming the action of the elastic member, the area of the opposite parts of the first sieve hole and the second sieve hole becomes larger, and then the coal powder with larger particles falls into the second container. Thus, graded sampling can be performed according to the size of the coal powder, and the structure of the coal powder sampling device is relatively simple.

[0006] According to some embodiments of the present application, the pulverized coal sampling device further comprises a connecting pipe, the outer sieve cylinder is connected with the connecting pipe at the end in the axial direction, the connecting pipe is supported on the first container and the second container, a guide sleeve is arranged on the inner wall of the connecting pipe, the guide sleeve extends along the axial direction of the outer sieve cylinder and is open towards the outer sieve cylinder, the end of the inner sieve cylinder in the axial direction is provided with a guide shaft, the guide shaft extends along the axial direction of the inner sieve cylinder, the guide shaft is movably inserted into the guide sleeve, and the elastic member is connected between the guide shaft and the inner wall of the guide sleeve.

[0007] According to some embodiments of the present application, the pulverized coal sampling device further comprises a connecting ring, the outer sieve cylinder is connected with the connecting ring in the axial direction, the connecting ring is inserted into the connecting pipe and connected with the inner wall of the connecting pipe, and the guide sleeve is arranged on the inner wall of the connecting pipe.

[0008] According to some embodiments of the present application, one end of the guide shaft inserted into the guide sleeve is connected with a sliding block, the sliding block extends out of the peripheral wall of the guide shaft in the radial direction of the guide shaft, a convex rib is arranged on the inner wall of the guide sleeve around the axis of the guide sleeve, the elastic member is a spring, the elastic member is sleeved on the guide shaft and connected between the sliding block and the convex rib.

[0009] According to some embodiments of the present application, a sealing member is further arranged in the guide sleeve, the sealing member is arranged at the opening of the guide sleeve and between the guide shaft and the inner wall of the guide sleeve.

[0010] According to some embodiments of the present application, a plurality of guide sleeves are arranged, the guide sleeves are arranged at intervals in the circumferential direction of the outer sieve cylinder, and the guide sleeve, the guide shaft and the elastic member are in one-to-one correspondence.

[0011] According to some embodiments of the present application, the pulverized coal sampling device further comprises an outer cylinder, the outer cylinder defines a protection cavity extending along the axial direction of the outer sieve cylinder, a first opening and a second opening are formed in the outer cylinder and communicate with the protection cavity, the outer sieve cylinder is arranged in the protection cavity, the outer cylinder is supported on the first container and the second container, the first opening is opposite to the first container, and the second opening is opposite to the second container.

[0012] According to some embodiments of the present application, the pulverized coal sampling device further comprises a sampling pipe, one end of the sampling pipe is connected with one end of the inner sieve cylinder provided with the feeding port, the other end of the sampling pipe is provided with a sampling port, and the stirring member extends into the sampling pipe.

[0013] According to some embodiments of the present application, a receiving plate is arranged on the lower side of the sampling port, and one end of the rotating shaft extends to be opposite to the receiving plate, and the end of the rotating shaft opposite to the receiving plate is provided with a spoiler column.

[0014] According to some embodiments of the present application, a cleaning brush is arranged on the outer wall of the rotating shaft, and the cleaning brush is suitable for cleaning the outer screen cylinder and the inner screen cylinder.

[0015] Additional aspects and advantages of the present application will be given in part in the following description, become apparent from the following description, or be understood through practice of the present application. BRIEF DESCRIPTION OF DRAWINGS

[0016] Figure 1 is a schematic view of a coal powder sampling device according to an embodiment of the present application; Figure 2 is Figure 1 is a schematic view of a partial structure of a coal powder sampling device shown in Figure 3 is a schematic view of an inner screen cylinder, an outer screen cylinder, a connecting pipe, a connecting ring, a guide shaft and a guide sleeve according to an embodiment of the present application; Figure 4 is a schematic view of a guide sleeve, a guide shaft and an elastic member according to an embodiment of the present application; Figure 5 is a schematic view of an agitating member and a cleaning brush according to an embodiment of the present application; Figure 6 is a schematic view of an inner screen cylinder, an outer screen cylinder and a cleaning brush according to an embodiment of the present application.

[0017] Reference Signs: 100, coal powder sampling device; 10, inner screen cylinder; 11, feeding port; 12, guide shaft; 121, sliding block; 20, outer screen cylinder; 21, connecting ring; 30, first container; 40, second container; 50, agitating member; 51, rotating shaft; 52, helical blade; 53, spoiler column; 60, connecting pipe; 61, guide sleeve; 611, convex rib; 612, sealing member; 62, elastic member; 70, outer cylinder; 80, sampling pipe; 81, receiving plate; 90, cleaning brush; 91, support; 92, brush head. DETAILED DESCRIPTION

[0018] The following describes embodiments of the present invention in detail, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present invention, and are not to be construed as limiting the present invention.

[0019] Reference below Figures 1-6 A pulverized coal sampling device 100 according to an embodiment of the present invention will be described.

[0020] like Figures 1-6 As shown, the coal powder sampling device 100 according to an embodiment of the present invention includes: an inner sieve drum 10 , an outer sieve drum 20 , a first container 30 , a second container 40 , an agitator 50 and an elastic member 62 .

[0021] Specifically, the outer sieve drum 20 is sleeved on the outer side of the inner sieve drum 10, and the inner sieve drum 10 is movably arranged in the outer sieve drum 20 along the axial direction of the inner sieve drum 10. One end of the inner sieve drum 10 is opened in the axial direction to form a feed port 11. A first sieve hole is formed on the side wall of the inner sieve drum 10, and a second sieve hole is formed on the side wall of the outer sieve drum 20. In the initial state, the first sieve hole and the second sieve hole are partially opposite in the radial direction of the inner sieve drum 10, and the first container 30 and the second container 40 are spaced apart in the axial direction of the outer sieve drum 20. The first container 30 and the second container 40 are arranged in intervals, and the first container 30 and the second container 40 are supported on the lower side of the outer sieve drum 20. The stirring member 50 is arranged in the inner sieve drum 10, and the stirring member 50 includes a rotating shaft 51 and a spiral blade 52. The rotating shaft 51 extends along the axial direction of the inner sieve drum 10, and the spiral blade 52 is provided on the outer peripheral wall of the rotating shaft 51. In the axial direction of the inner sieve drum 10, the spiral blade 52 spirally extends around the outer peripheral wall of the rotating shaft 51, and the elastic member 62 is connected between the inner sieve drum 10 and the outer sieve drum 20 in the axial direction of the inner sieve drum 10.

[0022] Among them, the first container 30 is located on the upstream side of the second container 40 in the axial movement direction of the inner screen drum 10 pushed by the spiral blade 52, the rotating shaft 51 is driven to rotate by the motor, and the inner screen drum 10 and the outer screen drum 20 are blocked at one end away from the feed port 11 in the axial direction.

[0023] In the process of sampling the coal powder, first, the coal powder is put into the inner sieve cylinder 10, then the rotating shaft 51 rotates, under the action of the helical blade 52, the coal powder will gradually move along the axial direction of the inner sieve cylinder 10, in the process of moving, the coal powder with smaller particles will fall into the first container 30 through the opposite parts of the first sieve hole and the second sieve hole, the coal powder with larger particles will be blocked by the inner sieve cylinder 10, and will be continuously accumulated at the rear end of the inner sieve cylinder 10 under the pushing of the helical blade 52, it can be understood that the coal powder with particles larger than the opposite parts of the first sieve hole and the second sieve hole will be stuck in the first sieve hole, when the helical blade 52 pushes the coal powder to move, the coal powder will exert an axial force on the inner sieve cylinder 10 by pushing the particles stuck in the first sieve hole, as the coal powder accumulated at the rear end of the inner sieve cylinder 10 increases, the pushing force of the helical blade 52 on the coal powder in the axial direction of the inner sieve cylinder 10 will also become larger and larger, in this way, the inner sieve cylinder 10 can produce displacement in the axial direction and the elastic member 62 can produce elastic deformation, when the inner sieve cylinder 10 produces displacement in the axial direction relative to the outer sieve cylinder 20, the area of the opposite parts of the first sieve hole and the second sieve hole will also become larger, thereby, the coal powder with larger particles can pass through the first sieve hole and the second sieve hole and enter the second container 40, on the one hand, the coal powder can be sampled according to the size, on the other hand, the probability of the coal powder blocking the first sieve hole and the second sieve hole and causing the sieving to fail can be reduced, and the reliability of the coal powder sampling device 100 in the working process can be improved.

[0024] By arranging the elastic member 62, on the one hand, the elastic member 62 can make the inner sieve cylinder 10 automatically return, on the other hand, only when the force of the coal powder on the inner sieve cylinder 10 is large enough, the inner sieve cylinder 10 can produce relatively large displacement in the axial direction relative to the outer sieve cylinder 20, in this way, the coal powder with larger particles collected in the first container 30 can be reduced, and thus the accuracy of the coal powder sampling according to the size can be improved, in addition, the action logic of the elastic member 62 on the coal powder sampling device 100 is relatively simple, and the structure of the coal powder sampling device 100 is also relatively simple, and thus the design difficulty and the production difficulty of the coal powder sampling device 100 can be reduced.

[0025] According to the coal powder sampling device 100 in the embodiment of the present application, in the process of the agitating member 50 pushing the coal powder, the coal powder with smaller particles enters the first container 30 through the opposite parts of the first sieve hole and the second sieve hole, and the coal powder with larger particles is accumulated at the rear end of the pushing direction, which can make the force of the inner sieve cylinder 10 in the axial direction become larger and larger, so that the inner sieve cylinder 10 produces displacement by overcoming the action of the elastic member 62, the area of the opposite parts of the first sieve hole and the second sieve hole becomes larger, and thus the coal powder with larger particles falls into the second container 40, thereby, the coal powder can be sampled according to the size, and the structure of the coal powder sampling device 100 is relatively simple.

[0026] In some embodiments of the present application, as Figures 1-4As shown, the coal powder sampling device 100 further comprises a connecting pipe 60, the end of the outer sieve cylinder 20 in the axial direction is connected with the connecting pipe 60, the connecting pipe 60 is supported on the first container 30 and the second container 40, the connecting pipe 60 is provided with a guide sleeve 61, the guide sleeve 61 extends along the axial direction of the outer sieve cylinder 20 and opens towards the outer sieve cylinder 20, the end of the inner sieve cylinder 10 in the axial direction is provided with a guide shaft 12, the guide shaft 12 extends along the axial direction of the inner sieve cylinder 10, the guide shaft 12 movably extends into the guide sleeve 61, and an elastic element 62 is connected between the guide shaft 12 and the inner wall of the guide sleeve 61.

[0027] In the working process of the coal powder sampling device 100, under the pushing of the coal powder, the inner sieve cylinder 10 moves relative to the outer sieve cylinder 20 in the axial direction, at the same time, the inner sieve cylinder 10 drives the guide shaft 12 to move in the guide sleeve 61, and the inner sieve cylinder 10 drives the elastic element 62 to deform, wherein by arranging the connecting pipe 60, the guide shaft 12 and the guide sleeve 61, the inner sieve cylinder 10 can be movably arranged relative to the outer sieve cylinder 20 in the axial direction, by arranging the guide shaft 12 and the guide sleeve 61, the displacement of the inner sieve cylinder 10 can be guided and limited, so that the inner sieve cylinder 10 moves in a limited direction, and the movement of the inner sieve cylinder 10 is more smooth, and the reliability of the coal powder sampling device 100 in the working process is improved. By arranging the elastic element 62 in the guide sleeve 61 and connecting the elastic element 62 between the guide shaft 12 and the inner wall of the guide sleeve 61, the elastic element 62 can be connected between the outer sieve cylinder 20 and the inner sieve cylinder 10 in the axial direction of the inner sieve cylinder 10, and the guide sleeve 61 can limit the elastic element 62, so that the elastic element 62 deforms in a set direction, thereby further improving the reliability of the coal powder sampling device 100 in the working process.

[0028] In some embodiments of the present application, as shown in Figure 2 and Figure 3 As shown, the coal powder sampling device 100 further comprises a connecting ring 21, the outer sieve cylinder 20 is connected with the connecting ring 21 in the axial direction, the connecting ring 21 extends into the connecting pipe 60 and is connected with the inner wall of the connecting pipe 60, and the guide sleeve 61 is arranged on the inner wall of the connecting pipe 60.

[0029] By arranging the connecting ring 21, the operation of connecting the outer sieve cylinder 20 with the connecting pipe 60 is more convenient, by arranging the guide sleeve 61 on the inner wall of the connecting pipe 60, and the size of the connecting pipe 60 relative to the feed inlet 11 is larger, the shielding of the connecting pipe 60 to the feed can be reduced.

[0030] Preferably, the connecting ring 21 is bolted to the connecting pipe 60, and the inner sieve drum 10 and the outer sieve drum 20 are provided with a connecting pipe 60, a guide shaft 12 and a guide sleeve 61 at both ends in the axial direction. The inner sieve drum 10 and the outer sieve drum 20 are connected at both ends in the axial direction by the connecting pipe 60, the guide shaft 12 and the guide sleeve 61 respectively, and an elastic member 62 is connected between the guide sleeve 61 and the guide shaft 12.

[0031] In some embodiments of the present invention, Figure 4 As shown, one end of the guide shaft 12 extending into the guide sleeve 61 is connected to a slider 121. In the radial outward direction of the guide shaft 12, the slider 121 extends out of the outer peripheral wall of the guide shaft 12. The inner wall of the guide sleeve 61 is provided with a rib 611 surrounding the axis of the guide sleeve 61. The elastic member 62 is a spring. The elastic member 62 is sleeved on the guide shaft 12 and connected between the slider 121 and the rib 611.

[0032] During the movement of the guide shaft 12 in the guide sleeve 61, the slider 121 cooperates with the inner wall of the guide sleeve 61 to guide and limit. In this way, a gap can be generated between the guide shaft 12 and the guide sleeve 61, thereby reducing the friction of the guide shaft 12 during the movement in the guide sleeve 61. By setting the rib 611 and setting the elastic member 62 as a spring, on the one hand, the difficulty of arranging the elastic member 62 in the guide sleeve 61 can be reduced. On the other hand, the deformation direction of the elastic member 62 can be better constrained, so that the direction of the force of the elastic member 62 on the inner screen drum 10 is closer to the theoretical design direction.

[0033] In some embodiments of the present invention, Figure 4 As shown, a sealing member 612 is further provided in the guide sleeve 61 . The sealing member 612 is provided at the opening of the guide sleeve 61 and is located between the guide shaft 12 and the inner wall of the guide sleeve 61 .

[0034] By setting the seal 612, the seal 612 can block the coal powder from entering the guide sleeve 61 at the opening of the guide sleeve 61, thereby reducing the probability of coal powder entering the guide sleeve 61 and hindering the normal movement of the guide shaft 12, and further improving the reliability of the coal powder sampling device 100 during operation.

[0035] In some embodiments of the present invention, Figure 2 and Figure 3 As shown, there are multiple guide sleeves 61, for example, there can be two, three or four guide sleeves 61, and the multiple guide sleeves 61 are arranged at intervals in the circumferential direction of the outer screen drum 20, and the guide sleeves 61, the guide shafts 12 and the elastic members 62 correspond to each other one by one.

[0036] During the axial movement of the inner screen cylinder 10 relative to the outer screen cylinder 20, each guide sleeve 61 and the guide shaft 12 can guide and limit the inner screen cylinder 10, thereby improving the stability of the inner screen cylinder 10 during movement.

[0037] Preferably, a plurality of guide sleeves 61 are arranged at both ends of the inner screen cylinder 10 and the outer screen cylinder 20.

[0038] In some embodiments of the present application, as shown in Figure 1 and Figure 2 The coal powder sampling device 100 further comprises an outer cylinder 70, the outer cylinder 70 defines a protection cavity extending along the axial direction of the outer screen cylinder 20, the outer cylinder 70 is provided with a first opening and a second opening communicating with the protection cavity, the outer screen cylinder 20 is arranged in the protection cavity, the outer cylinder 70 is supported on the first container 30 and the second container 40, and the first opening is opposite to the first container 30 and the second opening is opposite to the second container 40.

[0039] During the sampling of the coal powder, the coal powder of the inner screen cylinder 10 enters the first container 30 through the first opening and enters the second container 40 through the second opening.

[0040] By arranging the outer cylinder 70, the outer cylinder 70 can shield the coal powder and prevent the coal powder from leaking into the surrounding environment, thereby reducing the pollution to the surrounding environment during the sampling of the coal powder.

[0041] Preferably, the first container 30 is threadedly connected to the edge of the first opening, and the second container 40 is threadedly connected to the edge of the second opening.

[0042] In some embodiments of the present application, as shown in Figure 1 The coal powder sampling device 100 further comprises a sampling pipe 80, one end of the sampling pipe 80 is connected to one end of the inner screen cylinder 10 provided with the feed port 11, the other end of the sampling pipe 80 is provided with a sampling port, and the agitating member 50 extends into the sampling pipe 80.

[0043] During the operation of the coal powder sampling device 100, the coal powder enters the sampling pipe 80 through the sampling port, the agitating member 50 agitates and pushes the coal powder in the sampling pipe 80 into the inner screen cylinder 10, so that the coal powder entering the inner screen cylinder 10 is more uniform. The sampling pipe 80 can guide the coal powder to make it easier to enter the inner screen cylinder 10, and the probability of the coal powder leaking into the environment at the sampling pipe 80 is low, which can reduce the pollution to the environment during the sampling of the coal powder.

[0044] In some embodiments of the present application, as shown in Figure 1 The lower side edge of the sampling port is provided with a receiving plate 81, one end of the rotating shaft 51 extends to be opposite to the receiving plate 81, and the end of the rotating shaft 51 opposite to the receiving plate 81 is provided with a spoiler column 53.

[0045] In the working process of the pulverized coal sampling device 100, the pulverized coal falls on the receiving plate 81, the rotating shaft 51 drives the turbulence column 53 to stir the pulverized coal in the falling process, so that the uniformity of the pulverized coal entering the inner sieve cylinder 10 can be further improved.

[0046] In some embodiments of the present application, as shown in Figure 1 、 Figure 5 and Figure 6 , the outer peripheral wall of the rotating shaft 51 is provided with a cleaning brush 90, and the cleaning brush 90 is suitable for cleaning the outer sieve cylinder 20 and the inner sieve cylinder 10.

[0047] The cleaning brush 90 includes a bracket 91 and a brush head 92, the bracket 91 is threadedly connected with the outer peripheral wall of the rotating shaft 51, and the brush head 92 is connected with the bracket 91. In the working process of the pulverized coal sampling device 100, the rotating shaft 51 drives the cleaning brush 90 to rotate, and the cleaning brush 90 can clean the inner sieve cylinder 10 and the outer sieve cylinder 20, so as to reduce the probability of accumulation of the pulverized coal on the inner sieve cylinder 10 and the outer sieve cylinder 20, even the first sieve hole and the second sieve hole are blocked to affect the normal screening, and the reliability of the pulverized coal sampling device 100 in the working process is further improved.

[0048] In the description of the present application, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application.

[0049] In addition, the terms "first" and "second" are only for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the technical features indicated. Therefore, the features defined with "first" and "second" can explicitly or implicitly include one or more of the features. In the description of the present application, the meaning of "multiple" is two or more, unless otherwise specifically limited.

[0050] In the present invention, unless otherwise expressly specified or limited, terms such as "mounted," "connected," "connect," and "fixed" should be understood broadly. For example, they may refer to fixed connection, detachable connection, or integration; mechanical connection, electrical connection, or communication; direct connection or indirect connection through an intermediate medium; and internal communication between two components or interaction between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on specific circumstances.

[0051] In the description of this specification, the reference terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" mean that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art can combine and combine different embodiments or examples described in this specification and features of different embodiments or examples without contradiction.

[0052] While embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions, and variations may be made to the embodiments without departing from the principles and spirit of the invention, and that the scope of the invention is defined by the claims and their equivalents.

Claims

1. A pulverized coal sampling device (100), characterized in that: include: An inner sieve drum (10) and an outer sieve drum (20), wherein the outer sieve drum (20) is sleeved on the outer side of the inner sieve drum (10), and the inner sieve drum (10) is movably arranged in the outer sieve drum (20) along the axial direction of the inner sieve drum (10), and one end of the inner sieve drum (10) is open in the axial direction to form a feed port (11), a first sieve hole is formed on the side wall of the inner sieve drum (10), and a second sieve hole is formed on the side wall of the outer sieve drum (20), and in an initial state, the first sieve hole and the second sieve hole are partially opposite to each other in the radial direction of the inner sieve drum (10); a first container (30) and a second container (40), wherein the first container (30) and the second container (40) are spaced apart in the axial direction of the outer sieve cylinder (20), and the first container (30) and the second container (40) are supported on the lower side of the outer sieve cylinder (20); a stirring member (50), the stirring member (50) being arranged in the inner sieve drum (10), the stirring member (50) comprising a rotating shaft (51) and a spiral blade (52), the rotating shaft (51) extending in the axial direction of the inner sieve drum (10), the spiral blade (52) being arranged on the outer peripheral wall of the rotating shaft (51), and the spiral blade (52) extending spirally around the outer peripheral wall of the rotating shaft (51) in the axial direction of the inner sieve drum (10); An elastic member (62) is connected between the inner sieve drum (10) and the outer sieve drum (20) in the axial direction of the inner sieve drum (10).

2. The pulverized coal sampling device (100) according to claim 1, characterized in that: Also includes: A connecting pipe (60), the end of the outer sieve drum (20) in the axial direction is connected to the connecting pipe (60), the connecting pipe (60) is supported on the first container (30) and the second container (40), and a guide sleeve (61) is provided on the connecting pipe (60), the guide sleeve (61) extends along the axial direction of the outer sieve drum (20) and opens toward the outer sieve drum (20), The inner screen drum (10) is provided with a guide shaft (12) at an axial end thereof. The guide shaft (12) extends along the axial direction of the inner screen drum (10). The guide shaft (12) is movably inserted into the guide sleeve (61). The elastic member (62) is connected between the guide shaft (12) and the inner wall of the guide sleeve (61).

3. The pulverized coal sampling device (100) according to claim 2, characterized in that: Also includes: A connecting ring (21), the outer sieve drum (20) is connected to the connecting ring (21) in the axial direction, the connecting ring (21) extends into the connecting pipe (60) and is connected to the inner wall of the connecting pipe (60), and the guide sleeve (61) is arranged on the inner wall of the connecting pipe (60).

4. The pulverized coal sampling device (100) according to claim 2, characterized in that: One end of the guide shaft (12) extending into the guide sleeve (61) is connected to a slider (121). In the radial outward direction of the guide shaft (12), the slider (121) extends out of the outer peripheral wall of the guide shaft (12). The inner wall of the guide sleeve (61) is provided with a convex rib (611) surrounding the axis of the guide sleeve (61). The elastic member (62) is a spring, and the elastic member (62) is sleeved on the guide shaft (12) and connected between the slider (121) and the rib (611).

5. The pulverized coal sampling device (100) according to claim 2, characterized in that: A sealing member (612) is also provided in the guide sleeve (61). The sealing member (612) is provided at the opening of the guide sleeve (61) and is located between the guide shaft (12) and the inner wall of the guide sleeve (61).

6. The pulverized coal sampling device (100) according to claim 2, characterized in that: There are a plurality of guide sleeves (61), which are spaced apart in the circumferential direction of the outer screen cylinder (20). The guide sleeves (61), the guide shafts (12) and the elastic members (62) correspond to each other one by one.

7. The pulverized coal sampling device (100) according to claim 1, characterized in that: Also includes: An outer cylinder (70) defines a protective cavity extending axially along the outer sieve cylinder (20), and a first opening and a second opening are formed on the outer cylinder (70) and communicate with the protective cavity. The outer sieve cylinder (20) is arranged in the protective cavity. The outer cylinder (70) is supported on the first container (30) and the second container (40), and the first opening is opposite to the first container (30), and the second opening is opposite to the second container (40).

8. The pulverized coal sampling device (100) according to claim 1, characterized in that: Also includes: A sampling tube (80), one end of which is connected to one end of the inner sieve cylinder (10) provided with the feed port (11), the other end of which is provided with a sampling port, and the stirring member (50) extends into the sampling tube (80).

9. The pulverized coal sampling device (100) according to claim 8, characterized in that: A material receiving plate (81) is provided at the lower edge of the sampling port, one end of the rotating shaft (51) extends to face the material receiving plate (81) vertically, and a spoiler column (53) is provided at one end of the rotating shaft (51) facing the material receiving plate (81) vertically.

10. The pulverized coal sampling device (100) according to any one of claims 1 to 9, characterized in that: A cleaning brush (90) is provided on the outer peripheral wall of the rotating shaft (51), and the cleaning brush (90) is suitable for cleaning the outer sieve drum (20) and the inner sieve drum (10).

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