Sampling device and pneumatic conveying pipeline
By designing an automated sampling device, the problem of time-consuming, labor-intensive and cost-effective sampling of pneumatic conveying materials is solved, and efficient and low-cost sample sampling is achieved, ensuring sample representativeness and improving the yield of glass production.
Patent Information
- Application Number
- CN202422057896.9
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-08-23
- Publication Date
- 2025-08-19
- Estimated Expiration
- 2034-08-23
AI Technical Summary
In the prior art, the sampling process of pneumatic conveying materials is time-consuming, laborious, and has low accuracy, especially in the acceptance of glass raw material quartz sand.
A sampling device is designed, including a sampling valve seat, a sampling shaft and a driving unit. The driving unit drives the sampling shaft to rotate about its axis to realize the communication or avoidance of the sampling channel and the through hole. Combined with the photoelectric sensing component and the material flow detection component, the sampling process is automatically controlled.
It realizes efficient and low-cost sample sampling, ensures the randomness and representativeness of the samples, guides the glass production and batching process, and improves the yield.
Smart Images
Figure CN223244022U_ABST
Abstract
Description
Technical Field
[0001] The present disclosure relates to the technical field of sampling devices, and in particular to a sampling device and a pneumatic conveying pipeline. Background Art
[0002] Pneumatic conveying utilizes the energy of airflow to transport granular materials along the airflow within a closed pipe. It is a specific application of fluidization technology. In related technologies, pneumatic conveying often requires sampling and inspection of the material. Currently, manual sampling is commonly used, but this significantly increases labor costs and, due to its high degree of subjectivity, results in inaccurate sampling.
[0003] For example, during the incoming inspection of quartz sand, the raw material for glass, existing technology uses pneumatic conveying pipes to transport the sand from transport tankers to the raw material warehouse. During the transportation of the quartz sand, laboratory personnel need to sample and test the sand. Currently, this is done manually by holding a sampling device on the transport tanker. The entire sampling process is time-consuming and labor-intensive, increasing labor costs. The sampling process is also subject to significant subjectivity, resulting in inaccurate sampling results. This adds uncontrollable factors to the glass production process and cannot effectively guide the batching process in glass production. Utility Model Content
[0004] A technical problem to be solved by the present disclosure is that manual sampling during the pneumatic conveying of materials is time-consuming, labor-intensive, costly, and inaccurate.
[0005] To solve the above technical problems, the present disclosure provides a sampling device for sampling from a pneumatic conveying pipeline. The sampling device includes:
[0006] A sampling valve seat, the sampling valve seat having a first cavity and a first through hole communicating with the first cavity, the first through hole being provided at a position of the sampling valve seat connected to the pneumatic conveying pipe, a sampling port being provided at a position of the pneumatic conveying pipe connected to the sampling valve seat, the sampling port being communicated with the first through hole;
[0007] A sampling shaft, the sampling shaft is rotatably disposed on the sampling valve seat, a sampling section of the sampling shaft located in the first cavity forms a rotating pair with the inner wall of the first cavity, and the sampling section is provided with a sampling channel that can be connected to the outside of the sampling valve seat; and
[0008] A driving unit, the driving unit is connected to the sampling shaft in a driving manner;
[0009] The sampling shaft is configured to be driven to rotate about its own axis to a sampling position where the sampling channel is connected to the first through hole, or to a non-sampling position where the sampling channel avoids the first through hole.
[0010] In some embodiments, a photoelectric sensor assembly is provided on the sampling valve seat, and the photoelectric sensor assembly is configured to output a disconnection signal when the sampling shaft rotates around its own axis to the sampling position and the non-sampling position respectively. The driving unit is configured to stop driving the sampling shaft to rotate according to the disconnection signal output by the photoelectric sensor assembly.
[0011] In some embodiments, a material flow detection component is provided at a position near the first through hole of the pneumatic conveying pipeline. The material flow detection component is used to output a material presence signal when material passes through the pneumatic conveying pipeline. The driving unit is configured to drive the sampling shaft to rotate according to the material presence signal output by the material flow detection component.
[0012] In some embodiments, the sampling channel includes a first channel and a second channel, the first channel extends along the length direction of the sampling shaft to the end of the sampling shaft away from the driving unit, and the second channel is connected to the first channel and extends along the radial direction of the sampling shaft to the side of the sampling shaft.
[0013] In some embodiments, the end of the sampling shaft facing away from the driving unit is arranged in the first cavity, and the sampling valve seat is provided with a discharge port connected to the first cavity, and the discharge port is connected to a sample conveying pipe for conveying the sampled material outward.
[0014] In some embodiments, the driving unit includes a driving motor and a reducer, the driving motor is used to drive the reducer, and the output shaft of the reducer is drivingly connected to the sampling shaft.
[0015] In some embodiments, the sampling device also includes a tee, the first port of the tee is connected to the incoming section of the pneumatic conveying pipeline, the second port of the tee is connected to the outgoing section of the pneumatic conveying pipeline, and the third port of the tee is connected to the first through hole on the sampling valve seat.
[0016] In some embodiments, a transparent window is provided on the tube body of the tee tube facing the third port.
[0017] In some embodiments, a second through hole is further provided on the sampling valve seat, and the second through hole and the first through hole are spaced apart in the circumferential direction of the sampling valve seat so that when the sampling shaft rotates to the non-sampling position, the second through hole is connected to the sampling channel, and the second through hole is connected to an air blowing pipe, which is configured to be able to blow air into the sampling channel through the second through hole.
[0018] An embodiment of the present disclosure further provides a pneumatic conveying pipeline, comprising a pneumatic conveying pipe and a sampling device connected to the pneumatic conveying pipe, wherein the sampling device is the above-mentioned sampling device.
[0019] Through the above technical solution, the present invention provides power through the driving unit to drive the sampling shaft to rotate around its own axis. When the sampling shaft rotates to the sampling position where the sampling channel is connected to the first through hole, the material in the pneumatic conveying pipe can flow out through the first through hole and the sampling channel, thereby realizing sampling; when the sampling shaft rotates to the non-sampling position where the sampling channel and the first through hole avoid each other, the material in the pneumatic conveying pipe cannot enter the sampling channel through the first through hole, i.e., sampling is stopped. At this time, the material in the pneumatic conveying pipe can be transported forward under the action of the airflow without interference.
[0020] The sampling device provided by the present invention can easily take samples from the pneumatic conveying pipeline. Compared with the existing manual sampling method, it can effectively reduce labor costs, overcome the subjectivity of manual sampling, and ensure the randomness and representativeness of the samples taken. BRIEF DESCRIPTION OF THE DRAWINGS
[0021] In order to more clearly illustrate the embodiments of the present disclosure or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present disclosure. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.
[0022] Figure 1 It is a structural schematic diagram of a sampling device disclosed in an embodiment of the present disclosure;
[0023] Figure 2 is a side view of a sampling device disclosed in an embodiment of the present disclosure;
[0024] Figure 3 It is a structural schematic diagram of a sampling shaft disclosed in an embodiment of the present disclosure;
[0025] Figure 4 is a cross-sectional view of a sampling shaft disclosed in an embodiment of the present disclosure;
[0026] Figure 5 It is a structural schematic diagram of a three-way pipe disclosed in an embodiment of the present disclosure.
[0027] Description of reference numerals:
[0028] 1. Pneumatic conveying pipeline; 101. Sampling port; 102. Incoming section; 103. Outgoing section; 10. Sampling valve seat; 11. First cavity; 12. First through hole; 13. Discharge port; 131. Connecting nozzle; 14. Second through hole; 15. Seal; 16. Sealing cover; 20. Sampling shaft; 21. Sampling section; 22. Sampling channel; 221. First channel; 222. Second channel; 30. Drive unit; 31. Drive motor; 32. Reducer; 40. Material flow detection assembly; 50. Sample conveying pipeline; 60. Tee; 61. First port; 62. Second port; 63. Third port; 64. Transparent window; 65. Flange; 70. Air blowing pipeline. DETAILED DESCRIPTION
[0029] The following embodiments of the present disclosure are further described in detail with reference to the accompanying drawings and examples. The detailed description of the following examples and the accompanying drawings are intended to illustrate the principles of the present disclosure, but are not intended to limit the scope of the present disclosure. The present disclosure can be implemented in many different forms and is not limited to the specific embodiments disclosed herein, but rather includes all technical solutions within the scope of the claims.
[0030] The present disclosure provides these embodiments in order to make this disclosure thorough and complete, and to fully convey the scope of the present disclosure to those skilled in the art. It should be noted that: unless otherwise specifically stated, the relative arrangement of parts and steps, the composition of materials, numerical expressions and numerical values set forth in these embodiments should be interpreted as merely exemplary, and not as limiting.
[0031] It should be noted that, in the description of this disclosure, unless otherwise specified, "plurality" means greater than or equal to two; terms such as "upper," "lower," "left," "right," "inner," and "outer" indicating directions or positional relationships are intended solely to facilitate and simplify the description of this disclosure, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on this disclosure. When the absolute position of the object being described changes, the relative positional relationship may also change accordingly.
[0032] In addition, the terms "first," "second," and similar terms used in this disclosure do not denote any order, quantity, or importance, but are merely used to distinguish different parts. "Perpendicular" does not mean perpendicular in the strict sense, but rather means within the tolerance range. "Parallel" does not mean parallel in the strict sense, but rather means within the tolerance range. "Include" or "comprising" and similar terms mean that the elements preceding the term include the elements listed after the term, and do not exclude the possibility of also including other elements.
[0033] It should also be noted that, in the description of this disclosure, unless otherwise expressly specified or limited, the terms "installed," "connected," and "connected" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to direct connections or indirect connections through an intermediary. Those skilled in the art will understand the specific meanings of the above terms in this disclosure depending on the specific circumstances. When a specific device is described as being located between a first device and a second device, there may or may not be an intervening device between the specific device and the first or second device.
[0034] All terms used in this disclosure have the same meaning as understood by one of ordinary skill in the art to which this disclosure belongs, unless otherwise specifically defined. It should also be understood that terms defined in, for example, common dictionaries should be interpreted as having a meaning consistent with their meaning in the context of the relevant art, and should not be interpreted in an idealized or highly formal sense, unless explicitly defined as such herein.
[0035] Technologies, methods, and equipment known to ordinary technicians in the relevant art may not be discussed in detail, but where appropriate, the technologies, methods, and equipment should be considered part of the specification.
[0036] An embodiment of the present disclosure provides a sampling device for taking samples from a pneumatic conveying pipeline 1 .
[0037] like Figure 1 and Figure 2 As shown, the sampling device includes a sampling valve seat 10, a sampling shaft 20 and a driving unit 30. The sampling valve seat 10 has a first cavity 11 and a first through hole 12 connected to the first cavity 11. The first through hole 12 is provided at a position where the sampling valve seat 10 is connected to the pneumatic conveying pipe 1. A sampling port 101 is provided at a position where the pneumatic conveying pipe 1 is connected to the sampling valve seat 10. The sampling port 101 is connected to the first through hole 12. The sampling shaft 20 is rotatably provided on the sampling valve seat 10. A sampling section 21 of the sampling shaft 20 located in the first cavity 11 forms a rotating pair with the inner wall of the first cavity 11, and a sampling channel 22 capable of communicating with the outside of the sampling valve seat 10 is provided on the sampling section 21; the driving unit 30 is in transmission connection with the sampling shaft 20; wherein, the sampling shaft 20 is configured to be driven to rotate about its own axis to a sampling position where the sampling channel 22 is connected to the first through hole 12, or to a non-sampling position where the sampling channel 22 avoids the first through hole 12.
[0038] In the technical solution provided by the present disclosure, power is provided by the driving unit 30 to drive the sampling shaft 20 to rotate around its own axis. When the sampling shaft 20 rotates to the sampling position where the sampling channel 22 is connected to the first through hole 12, the material in the pneumatic conveying pipe 1 can flow out through the first through hole 12 and the sampling channel 22, thereby realizing sampling; when the sampling shaft 20 rotates to the non-sampling position where the sampling channel 22 avoids the first through hole 12, the material in the pneumatic conveying pipe 1 cannot enter the sampling channel 22 through the first through hole 12, i.e., sampling is stopped. At this time, the material in the pneumatic conveying pipe 1 can be transported forward undisturbed by the action of the airflow.
[0039] In the sampling device provided in the embodiment of the present disclosure, the power for the sampled material to flow out of the pneumatic conveying pipe 1 comes from the energy of the airflow. The sampling device provided by the present disclosure can easily remove samples from the pneumatic conveying pipe 1, effectively reducing labor costs compared to existing manual sampling methods, overcoming the subjectivity of manual sampling, and ensuring the randomness and representativeness of the samples taken.
[0040] The inventors of the present disclosure have found that by using the sampling device of the present disclosure to take samples during the acceptance inspection of the glass raw material quartz sand upon arrival at the factory, the quartz sand samples taken are highly representative, can well guide the batching process in glass kiln production, and significantly improve the yield of glass production.
[0041] In the embodiment of the present disclosure, the driving unit 30 can be configured to stop driving when the sampling shaft 20 rotates to the sampling position in any appropriate manner, that is, to ensure that the sampling shaft 20 can stay at the sampling position for a sufficient time so that the material in the pneumatic conveying pipeline 1 can be sampled to a sufficient amount; or, to stop driving when the sampling shaft 20 rotates to the non-sampling position to ensure that the sampling shaft 20 can stay at the non-sampling position to avoid affecting the normal transportation of the material in the pneumatic conveying pipeline 1.
[0042] In some embodiments, a photoelectric sensor component is provided on the sampling valve seat 10, and the photoelectric sensor component is configured to output a disconnection signal when the sampling shaft 20 rotates around its own axis to the sampling position and the non-sampling position respectively. The driving unit 30 is configured to stop driving the sampling shaft 20 to rotate according to the disconnection signal output by the photoelectric sensor component.
[0043] In the embodiment of the present disclosure, the rotational position of the sampling shaft 20 is detected by a photoelectric sensor assembly. When the sampling shaft 20 rotates to the sampling position where the sampling channel 22 is connected to the first through hole 12, the photoelectric sensor assembly detects the position information and outputs a disconnection signal to the outside. The drive unit 30 stops driving the sampling shaft 20 to rotate according to the disconnection signal, and keeps the sampling shaft 20 in the sampling position, so that the material in the pneumatic conveying pipe 1 can be continuously taken out. After taking out the required amount of sample, the drive unit 30 is restarted again, and the sampling shaft 20 is driven to rotate to the non-sampling position where the sampling channel 22 and the first through hole 12 are avoided. The photoelectric sensor assembly detects the position information and outputs a disconnection signal to the outside. The drive unit 30 stops driving the sampling shaft 20 to rotate according to the disconnection signal, and keeps the sampling shaft 20 in the non-sampling position. By setting the photoelectric sensor assembly, it is possible to ensure that the sampling shaft 20 is maintained in an accurate position to achieve a sampling or non-sampling state.
[0044] It is understood that in some embodiments of the present disclosure, the sampling device further includes a timer to determine the residence time of the sampling shaft 20 at the sampling position and the non-sampling position according to the sampling volume requirements and sampling interval requirements of different materials.
[0045] In some embodiments, a material flow detection assembly 40 is provided near the first through hole 12 of the pneumatic conveying pipeline 1. The material flow detection assembly 40 is configured to output a material presence signal when material passes through the pneumatic conveying pipeline 1. The drive unit 30 is configured to drive the sampling shaft 20 to rotate based on the material presence signal output by the material flow detection assembly 40. It will be understood that it makes sense to activate the drive unit 30 only when there is flowing material in the pneumatic conveying pipeline 1. The present disclosure detects whether there is material flowing in the pneumatic conveying pipeline 1 by providing the material flow detection assembly 40. Only when there is material flowing can the drive unit 30 drive the sampling shaft 20 to rotate.
[0046] In the present disclosure, the sampling channel 22 on the sampling section 21 can be configured as any appropriate structural form, as long as it can form a sampling position where the sampling channel 22 is connected to the first through hole 12 during the rotation of the sampling shaft 20 around its own axis, or form a non-sampling position where the sampling channel 22 avoids the first through hole 12. In some embodiments, combined with Figure 3 and Figure 4 As shown, the sampling channel 22 includes a first channel 221 and a second channel 222. The first channel 221 extends along the length of the sampling shaft 20 to the end of the sampling shaft 20 away from the drive unit 30. The second channel 222 is connected to the first channel 221 and extends along the radial direction of the sampling shaft 20 to the side of the sampling shaft 20. It can be understood that the sampling channel 22 of the above structure has the advantages of simple structure and easy processing.
[0047] In the disclosed embodiment, the sampling shaft 20 forms a rotating pair between the sampling section 21 and the inner wall of the first cavity 11, thereby switching the sampling channel 22 on the sampling section 21 between being connected to and disconnected from the first through-hole 12. It is understood that the end of the sampling shaft 20 facing away from the drive unit 30 can extend directly out of the first cavity 11, allowing the sampling channel 22 to extend directly to the outside of the first cavity 11, directly discharging the sampled material within the pneumatic conveying pipe 1. However, such a solution would require the addition of bearings to accommodate the rotational arrangement of the sampling shaft 20 on the sampling valve seat 10 when extending from the first cavity 11. In some embodiments, the end of the sampling shaft 20 facing away from the drive unit 30 is disposed within the first cavity 11, and the sampling valve seat 10 is provided with a discharge port 13 communicating with the first cavity 11. The discharge port 13 is connected to a sample delivery pipe 50 for discharging the sampled material. That is, the end of the sampling shaft 20 facing away from the drive unit 30 may not extend out of the first cavity 11, but a discharge port 13 connected to the first cavity 11 is provided on the sampling valve seat 10, and the sample introduced into the first cavity 11 through the sampling channel 22 is further discharged outward through the discharge port 13.
[0048] In this disclosure, Figure 2 As shown, the sampling shaft 20 is rotatably arranged on the sampling valve seat 10 through a bearing. The sampling valve seat 10 is also provided with a sealing member 15 and a sealing gland 16 to prevent the material in the first cavity 11 from escaping from this position.
[0049] It is understood that the device structure of the above solution is simpler, and the sample delivery pipe 50 connected to the discharge port 13 can be configured to be detachable, thereby facilitating subsequent maintenance operations. For example, a connecting nozzle 131 is connected to the discharge port 13 via a flange. The diameter of the connecting nozzle 131 gradually decreases in the direction away from the discharge port 13, and the sample delivery pipe 50 is sleeved on the outside of the connecting nozzle 131.
[0050] In some embodiments, the driving unit 30 includes a driving motor 31 and a reducer 32 . The driving motor 31 is used to drive the reducer 32 . The output shaft of the reducer 32 is in driving connection with the sampling shaft 20 .
[0051] In the embodiment of the present disclosure, the output shaft of the speed reducer 32 can be connected to the sampling shaft 20 via a flat key, thereby transmitting the torque of the speed reducer 32 to the sampling shaft 20, enabling the sampling shaft 20 to rotate about its own axis. It is understood that the output shaft of the speed reducer 32 and the sampling shaft 20 can also be connected via a spline or other transmission member with the same function.
[0052] In some embodiments, combined Figure 1 、 Figure 2 and Figure 5As shown, the sampling device further includes a tee 60, a first port 61 of the tee 60 being connected to the incoming section 102 of the pneumatic conveying pipeline 1, a second port 62 of the tee 60 being connected to the outgoing section 103 of the pneumatic conveying pipeline 1, and a third port 63 of the tee 60 being connected to the first through hole 12 on the sampling valve seat 10. It will be appreciated that, in the non-sampling position, the material in the pneumatic conveying pipeline 1 can pass through the tee 60 unimpeded by the airflow; in the sampling position, a portion of the material in the pneumatic conveying pipeline 1 can flow through the third port 63 and the first through hole 12 into the sampling channel 22 under the action of the airflow, thereby achieving sampling of the material in the pneumatic conveying pipeline 1.
[0053] In some embodiments, in order to facilitate observation of whether the sampling operation is proceeding normally, a transparent window 64 is provided on the tube body of the three-way tube 60 facing the third port 63 .
[0054] In some embodiments, the first port 61 and the second port 62 of the tee 60 are detachably connected to the pneumatic conveying pipeline 1 via flanges 65. In the embodiment of the present disclosure, the two ports of the tee 60 are detachably connected to the pneumatic conveying pipeline 1 via flanges 65, which ensures good sealing while facilitating subsequent inspection and maintenance. If a fault occurs on the sampling valve seat 10, the entire sampling device can be easily removed from the pneumatic conveying pipeline 1 for maintenance. It will be understood that in the embodiment of the present disclosure, in order to avoid unnecessary flow resistance to the material in the pneumatic conveying pipeline 1, the first port 61 and the second port 62 on the tee 60 are coaxially arranged.
[0055] In some embodiments, a second through hole 14 is further provided on the sampling valve seat 10. The second through hole 14 and the first through hole 12 are spaced apart in the circumferential direction of the sampling valve seat 10 so that when the sampling shaft 20 rotates to the non-sampling position, the second through hole 14 is connected to the sampling channel 22. The second through hole 14 is connected to an air blowing pipe 70, and the air blowing pipe 70 is configured to be able to blow air into the sampling channel 22 through the second through hole 14.
[0056] In the embodiment of the present disclosure, when the material in the pneumatic conveying pipe 1 is sampled through the sampling channel 22, there may be some residual material samples in the sampling channel 22. Through the above-mentioned structural arrangement, when in the non-sampling position, air is blown into the sampling channel 22 through the second through hole 14 through the blowing pipe 70 to blow out the residual material samples in the sampling channel 22 to avoid interference with the next sampling.
[0057] In the embodiment of the present disclosure, the gas blown into the sampling channel 22 through the blowing pipe 70 is adaptively selected according to the type of the material sample, so as to control the cost without affecting the performance of the material sample.
[0058] The disclosed embodiments further provide a pneumatic conveying pipeline comprising a pneumatic conveying pipe 1 and a sampling device connected to the pneumatic conveying pipe 1, wherein the sampling device is the aforementioned sampling device. The aforementioned sampling device can easily remove samples from the pneumatic conveying pipe 1, effectively reducing labor costs compared to existing manual sampling methods, overcoming the subjectivity inherent in manual sampling, and ensuring the randomness and representativeness of the samples.
[0059] Thus far, various embodiments of the present disclosure have been described in detail. To avoid obscuring the concept of the present disclosure, some details known in the art have not been described. Based on the above description, those skilled in the art can fully understand how to implement the technical solutions disclosed herein.
[0060] Although some specific embodiments of the present disclosure have been described in detail through examples, those skilled in the art will understand that the above examples are for illustrative purposes only and are not intended to limit the scope of the present disclosure. Those skilled in the art will understand that the above embodiments may be modified or some technical features may be replaced with equivalents without departing from the scope and spirit of the present disclosure. In particular, as long as there are no structural conflicts, the various technical features mentioned in the various embodiments may be combined in any manner.
Claims
1. A sampling device for sampling from a pneumatic conveying pipeline (1), characterized in that: The sampling device comprises: A sampling valve seat (10), the sampling valve seat (10) having a first cavity (11) and a first through hole (12) communicating with the first cavity (11), the first through hole (12) being arranged at a position of the sampling valve seat (10) connected to the pneumatic conveying pipe (1), a sampling port (101) being arranged at a position of the pneumatic conveying pipe (1) connected to the sampling valve seat (10), the sampling port (101) being communicated with the first through hole (12); a sampling shaft (20), the sampling shaft (20) being rotatably disposed on the sampling valve seat (10), a sampling section (21) of the sampling shaft (20) located in the first cavity (11) forming a rotation pair with the inner wall of the first cavity (11), the sampling section (21) being provided with a sampling channel (22) capable of communicating with the outside of the sampling valve seat (10); and a driving unit (30), the driving unit (30) being in driving connection with the sampling shaft (20); The sampling shaft (20) is configured to be driven to rotate about its own axis to a sampling position where the sampling channel (22) is connected to the first through hole (12), or to a non-sampling position where the sampling channel (22) and the first through hole (12) are avoided.
2. The sampling device according to claim 1, characterized in that A photoelectric sensor assembly is provided on the sampling valve seat (10), and the photoelectric sensor assembly is configured to output a disconnection signal when the sampling shaft (20) rotates around its own axis to a sampling position and a non-sampling position, respectively. The driving unit (30) is configured to stop driving the sampling shaft (20) to rotate according to the disconnection signal output by the photoelectric sensor assembly.
3. The sampling device according to claim 1, characterized in that A material flow detection component (40) is provided at a position of the pneumatic conveying pipeline (1) close to the first through hole (12). The material flow detection component (40) is used to output a material presence signal when material passes through the pneumatic conveying pipeline (1). The driving unit (30) is configured to drive the sampling shaft (20) to rotate according to the material presence signal output by the material flow detection component (40).
4. The sampling device according to claim 1, characterized in that The sampling channel (22) comprises a first channel (221) and a second channel (222), wherein the first channel (221) extends along the length direction of the sampling shaft (20) to the end of the sampling shaft (20) facing away from the driving unit (30), and the second channel (222) is connected to the first channel (221) and extends along the radial direction of the sampling shaft (20) to the side of the sampling shaft (20).
5. The sampling device according to claim 1, characterized in that The end of the sampling shaft (20) facing away from the driving unit (30) is arranged in the first cavity (11), and the sampling valve seat (10) is provided with a discharge port (13) connected to the first cavity (11), and the discharge port (13) is connected to a sample delivery pipe (50) for delivering the sampled material outward.
6. The sampling device according to claim 1, characterized in that The driving unit (30) comprises a driving motor (31) and a reducer (32), wherein the driving motor (31) is used to drive the reducer (32), and an output shaft of the reducer (32) is in driving connection with the sampling shaft (20).
7. The sampling device according to claim 1, characterized in that The sampling device further comprises a three-way pipe (60), wherein a first port (61) of the three-way pipe (60) is connected to the incoming section (102) of the pneumatic conveying pipeline (1), a second port (62) of the three-way pipe (60) is connected to the outgoing section (103) of the pneumatic conveying pipeline (1), and a third port (63) of the three-way pipe (60) is connected to the first through hole (12) on the sampling valve seat (10).
8. The sampling device according to claim 7, characterized in that A transparent window (64) is provided on the tube body of the three-way tube (60) facing the third port (63).
9. The sampling device according to any one of claims 1 to 8, characterized in that The sampling valve seat (10) is further provided with a second through hole (14), and the second through hole (14) and the first through hole (12) are spaced apart in the circumferential direction of the sampling valve seat (10), so that when the sampling shaft (20) rotates to the non-sampling position, the second through hole (14) is connected to the sampling channel (22), and the second through hole (14) is connected to an air blowing pipe (70), and the air blowing pipe (70) is configured to be able to blow air into the sampling channel (22) through the second through hole (14).
10. A pneumatic conveying pipeline, characterized in that: The invention comprises a pneumatic conveying pipeline (1) and a sampling device connected to the pneumatic conveying pipeline (1), wherein the sampling device is the sampling device according to any one of claims 1 to 9.