A urea granule pneumatic conveying pipeline sampling device

Abstract

This invention relates to a sampling device for a pneumatic conveying pipeline of urea granules, belonging to the technical field of sampling devices. It includes a sampling assembly comprising a protective box with a receiving chamber at the top and a sampling chamber at the bottom. A discharge cylinder is positioned between the receiving and sampling chambers. A buffer mesh cylinder is installed within the receiving chamber. A sampling pipe is connected to the side of the protective box. The inlet of the sampling pipe is connected to the conveying pipeline to the urea storage tank, and the outlet of the sampling pipe is located at the top inlet of the buffer mesh cylinder. A timed pneumatic sampling valve is installed on the sampling pipe. A sampling bucket is located within the sampling chamber, and a discharge pipe is connected to the bottom of the discharge cylinder, with the free end of the discharge pipe located at the inlet of the sampling bucket. This invention can ensure the personal safety of sampling personnel, reduce operational safety risks, improve operational efficiency, and reduce environmental pollution risks.

Description

Technical Field

[0001] This invention relates to a sampling device for a pneumatic conveying pipeline of urea granules, belonging to the technical field of sampling devices. Background Technology

[0002] In urea unloading operations, it is often necessary to transfer bulk urea delivered by urea manufacturers to designated locations. Compressed air is typically used to transport the bulk urea from tank trucks through pipelines in the form of a gas-solid mixture to the designated storage space. To meet testing requirements, random sampling is conducted during the unloading process using sampling tubes pre-installed on the pipelines to achieve the desired sampling objectives.

[0003] In actual use, the compressed air pressure inside the urea delivery pipeline is around 0.3 MPa. Currently, sampling is mostly done manually on-site, and multiple samples are taken to obtain the required weight for analysis. The following risks and shortcomings exist in this practical operation: 1. The sampling process requires manual control of the sampling time, which can easily cause errors and affect the accuracy of the measurement.

[0004] 2. Manual sampling is easily affected by environmental and operational factors, which may result in samples that are not representative or contain errors.

[0005] 3. Urea particles generated by high pressure may splash and injure people.

[0006] Therefore, improvements are urgently needed. Summary of the Invention

[0007] In order to overcome the shortcomings of the prior art, the present invention designs a urea granule pneumatic conveying pipeline sampling device, which can ensure the personal safety of sampling personnel, reduce operational safety risks, improve operational efficiency, and reduce environmental pollution risks.

[0008] To achieve the above objectives, the present invention adopts the following technical solution: A sampling device for a pneumatic conveying pipeline of urea granules includes a sampling component. The sampling component includes a protective box. The top of the protective box is a receiving chamber, and the bottom of the protective box is a taking chamber. A discharge cylinder is provided between the receiving chamber and the taking chamber. The receiving chamber is equipped with a buffer mesh cylinder, and a sampling pipe is connected to the side of the protective box. The inlet of the sampling pipe is connected to the conveying pipe of the urea storage tank, and the outlet of the sampling pipe is located at the top inlet of the buffer mesh cylinder. A sampling pneumatic valve that can be started at a time is installed on the sampling pipe. The sampling chamber is equipped with a sampling bucket, and the bottom end of the feeding cylinder is connected to a feeding pipe, with the free end of the feeding pipe located at the inlet of the sampling bucket.

[0009] Furthermore, a feeding auxiliary device is fixedly installed at the bottom of the feeding cylinder. The feeding auxiliary device includes a slide rail two, on which a driving block is slidably installed. A limiting groove is opened along the length direction on the side of the slide rail two near the feeding tube. A connecting rod is slidably engaged in the limiting groove. One end of the connecting rod is fixedly connected to the driving block, and the other end of the connecting rod is fixedly connected to a driving magnetic ring. The driving magnetic ring is movably sleeved on the outside of the feeding tube. A magnetic scraper ring that magnetically attracts the driving magnetic ring is also provided inside the feeding tube. The magnetic scraper ring is movably fitted against the inner wall of the feeding tube.

[0010] Furthermore, several fixing plates are uniformly fixed along the circumference of the inner wall of the feeding pipe, magnetic scraper rings are spaced apart on the top of the fixing plates, and lifting springs are fixedly connected between the magnetic scraper rings and each fixing plate.

[0011] Furthermore, the magnetic scraping ring includes a circular ring body and a conical ring body integrally disposed at the top of the circular ring body, and a scraping slope is provided on the inner side of the conical ring body.

[0012] Furthermore, the feeding auxiliary device also includes a slide rail one fixedly arranged on both sides of the slide rail, a sliding block slidably installed on the slide rail one, an impact rod fixedly connected to the bottom end of the sliding block, a fixed block spaced apart at the top end of the sliding block, a storage spring between the fixed block and the sliding block, a vibrating ring fixedly sleeved on the feeding pipe, and a linkage component between the sliding block and the drive block, the sliding block driving the impact rod to strike the vibrating ring through the linkage component.

[0013] Furthermore, the linkage component includes a toggle block, a telescopic rod, and a lever. The toggle block is fixed between the sliding block and the driving block. The telescopic rod is elastically telescopically disposed on the side of the sliding block near the driving block. The lever is fixedly disposed on the side of the driving block near the sliding block. The toggle block is provided with a toggle inclined surface on the side near the vibrating ring. The sliding block is provided with a counter-sloping surface that can cooperate with the toggle inclined surface. The lever and the toggle block are offset.

[0014] Furthermore, a guide rod is vertically fixedly connected to the fixed block, and a storage spring is sleeved on the outside of the guide rod.

[0015] Furthermore, multiple strong magnetic adsorption columns are uniformly embedded along the circumference of the side of the circular ring.

[0016] Furthermore, an exhaust hole is provided on the side of the receiving chamber away from the outlet of the sampling pipe, an exhaust pipe is connected to the exhaust hole, a filter bag is connected to the free end of the exhaust pipe, and an exhaust baffle is also provided at the exhaust hole.

[0017] Furthermore, the protective box is equipped with a detachable upper cover with an observation window; the discharge pipe is also equipped with a manual sampling door; the upstream and downstream positions of the connection point between the sampling pipe and the urea storage tank conveying pipe are respectively equipped with a front manual door and a rear manual door; and a sampling manual valve is also equipped upstream of the sampling pneumatic valve.

[0018] Compared with the prior art, the present invention has the following features and beneficial effects: 1. This invention achieves automated and precise sampling through a timed-start sampling pneumatic valve, eliminating errors caused by manual timing. The entire sampling process is completed within a sealed protective box, avoiding environmental and human factors from contaminating and interfering with the sample, ensuring the sample's representativeness. The buffer mesh effectively slows down and separates the high-pressure urea particles into gas and solid components. Combined with the exhaust port, exhaust pipe, and filter bag forming the exhaust dust removal path, it fundamentally eliminates the safety hazard of high-pressure particles splashing and injuring people. Compared with manual sampling, it is not only more efficient but also achieves dust-free and environmentally friendly emissions.

[0019] 2. This invention closely links the scraping and vibration actions. When a vibration is completed, the magnetic scraper ring also completes a scraping action, first breaking the adhesion before applying vibration. The scraping action breaks the adhesion between the material layer and the pipe wall, making it change from a stuck state to a loose state. The subsequent vibration impact uses high-frequency vibration to make these loosened particles slide down quickly. The combination of the two solves the problems that scraping alone is easy to leave a thin layer and vibration alone is not effective for large material accumulations. In this way, automated periodic anti-clogging is achieved, ensuring the smoothness and stability of the sampling device under long-term continuous operation. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the connection structure of the present invention; Figure 2 This is a front view of the installation of the material feeding auxiliary device of the present invention; Figure 3 This is a three-dimensional installation structure diagram of the material feeding auxiliary device of the present invention from a first-view perspective; Figure 4 This is a two-dimensional installation structure diagram of the material feeding auxiliary device of the present invention from a second perspective; Figure 5 yes Figure 4 A magnified schematic diagram of the structure at point A; Figure 6 This is a schematic diagram of the installation structure of the magnetic scraper ring of the present invention; Figure 7 This is a cross-sectional view of the magnetic scraping ring structure of the present invention.

[0021] The attached diagrams are labeled as follows: 1. Urea storage tank conveying pipeline; 11. Manual valve before the pipeline; 12. Manual valve after the pipeline; 2. Sampling pipeline; 21. Manual sampling valve; 22. Pneumatic sampling valve; 3. Sampling assembly; 31. Protective box; 32. Top cover; 33. Observation window; 34. Exhaust pipe; 3401. Filter bag; 35. Exhaust baffle; 36. Buffer screen; 37. Connecting frame; 38. Feeding cylinder; 39. Feeding pipe; 3901. Fixing plate; 3902. Lifting spring; 310. Sampling. 311 Manual door; 312 Sampling bucket; 4. Vibrating ring; 4. Material feeding auxiliary device; 41. Slide rail one; 42. Slide rail two; 43. Sliding block; 4301. Telescopic rod; 4302. Top inclined plane; 44. Drive block; 4401. Toggle rod; 45. Impact rod; 46. Limiting groove; 47. Drive magnetic ring; 48. Fixing block; 49. Guide rod; 410. Storage spring; 411. Toggle block; 412. Toggle inclined plane; 5. Magnetic scraper ring; 51. Scraping inclined plane; 6. Strong magnetic adsorption column. Detailed Implementation

[0022] The present invention will now be described in more detail with reference to the embodiments.

[0023] Example 1 Please see Figure 1 The urea granule pneumatic conveying pipeline sampling device of this embodiment includes a sampling component 3, which includes a protective box 31. The top of the protective box 31 is a receiving chamber, and the bottom of the protective box 31 is a taking chamber. A discharge cylinder 38 is provided between the receiving chamber and the taking chamber.

[0024] A buffer mesh cylinder 36 is provided inside the receiving chamber. In this embodiment, the top of the buffer mesh cylinder 36 is set at an angle to facilitate the receiving of urea particles.

[0025] The protective box 31 is connected to a sampling pipe 2 on its side. The inlet of the sampling pipe 2 is connected to the urea storage tank conveying pipe 1. The outlet of the sampling pipe 2 is located at the top inlet of the buffer mesh cylinder 36. A sampling pneumatic valve 22 that can be started at a time is installed on the sampling pipe 2.

[0026] In this embodiment, the sampling pneumatic valve 22 is opened for ten seconds every five minutes to perform cumulative sampling.

[0027] A sampling barrel 311 is provided inside the sampling chamber, and a feeding pipe 39 is connected to the bottom end of the feeding cylinder 38. The free end of the feeding pipe 39 is located at the inlet of the sampling barrel 311.

[0028] In this embodiment, the sampling chamber can be opened, which makes it easier for the sampling personnel to take out the sampling bucket 311 after sampling.

[0029] When sampling is required, the pre-set sampling pneumatic valve 22 will automatically open according to the set program at regular intervals, for example, opening for ten seconds every five minutes. After the sampling pneumatic valve 22 is opened, the urea particles in the gas-solid mixture state are drawn out through the sampling pipe 2 under the push of compressed air in the urea storage tank conveying pipe 1. Since the outlet of the sampling pipe 2 is set at the top inlet of the buffer mesh cylinder 36 in the top receiving chamber inside the protective box 31, the high-pressure urea particles sprayed from the sampling pipe 2 will directly enter the buffer mesh cylinder 36. The cylinder wall of the buffer mesh cylinder 36 can effectively block and consume the kinetic energy of the high-speed moving urea particles, causing them to slow down and fall naturally. At the same time, the high-pressure gas escapes through the mesh, thereby completing the gas-solid separation and avoiding the risk of high-pressure particles splashing and injuring people.

[0030] Meanwhile, the top of the buffer mesh cylinder 36 is set at an angle, which can more effectively receive all the incoming urea particles and prevent them from scattering outside the receiving chamber. After being separated and slowed down, the urea particles fall to the bottom of the receiving chamber under the action of gravity, and enter the feeding pipe 39 connected to it through the feeding cylinder 38 below. Finally, they fall smoothly along the free end of the feeding pipe 39 into the sampling bucket 311 placed in the sampling chamber, completing one automatic cumulative sampling.

[0031] By repeating the above timed opening and closing process, the required sample weight can be accumulated in multiple batches without manual intervention. After sampling is completed, the operator can directly open the sampling chamber and safely remove the sampling bucket 311 containing the representative sample.

[0032] As can be seen from the above description, by setting a sampling pneumatic valve 22 that can be started at a time, the sampling is automated and precise, completely replacing the operation of manually controlling the sampling time, avoiding measurement errors caused by human delay or early sampling, and significantly improving the accuracy of the test results.

[0033] The entire sampling process is completed automatically inside the sealed protective box 31, eliminating the contamination or interference of environmental factors (such as wind and dust) and differences in human operation on the sample, ensuring that the sample can truly represent the quality of urea in the delivery pipeline, and solving the problem of insufficient sample representativeness.

[0034] By setting a buffer mesh cylinder 36 in the receiving chamber, the urea particles sprayed under high pressure are effectively slowed down and separated into gas and solid, so that the urea particles fall smoothly into the sampling bucket 311, which fundamentally eliminates the safety hazards of high pressure particles splashing and injuring people and dust flying, and ensures the personal safety of operators.

[0035] The sampling component 3 sets up the receiving chamber and the sampling chamber in upper and lower layers, and transfers materials through the feeding cylinder 38 and the feeding pipe 39. The structure is compact and the functional areas are clearly defined, which not only ensures the continuity and airtightness of the sampling process, but also facilitates the subsequent removal of the sampling bucket 311, and has excellent practicality and reliability.

[0036] Furthermore, an exhaust hole is provided on the side of the receiving chamber away from the outlet of the sampling pipe 2. An exhaust pipe 34 is connected to the exhaust hole, and a filter bag 3401 is connected to the free end of the exhaust pipe 34. An exhaust baffle 35 is also provided at the exhaust hole.

[0037] As described above, when high-pressure gas carrying urea particles enters the receiving chamber, the gas flows within the chamber and eventually needs to be discharged. The exhaust port provides a channel for the gas discharge. At the same time, in order to prevent the airflow in the chamber from directly carrying a large number of urea particles or dust out through the exhaust port, an exhaust baffle 35 is installed at the exhaust port. The exhaust baffle 35 can effectively change the airflow direction and block the direct impact of larger particles. Subsequently, the gas enters the exhaust pipe 34 through the exhaust port and finally reaches the filter bag 3401 connected to the free end of the exhaust pipe 34. The filter bag 3401 intercepts and filters the fine urea dust remaining in the gas, allowing only clean air to pass through the bag and be discharged into the atmosphere, thereby achieving the purpose of gas-solid separation and pressure relief discharge.

[0038] Furthermore, the protective box 31 is provided with a detachable upper cover 32, and the upper cover 32 is provided with an observation window 33.

[0039] When it is necessary to inspect, clean, or replace components such as the buffer mesh cylinder 36 inside the protective box 31, the operator can directly remove the upper cover 32 for easy maintenance.

[0040] The transparent observation window 33 allows direct observation of the urea particles falling inside the receiving chamber, whether the buffer screen 36 is blocked, and whether the discharge cylinder 38 is unobstructed, etc., making it easy for sampling personnel to have a real-time and intuitive grasp of the material flow and equipment condition inside the chamber.

[0041] The feeding pipe 39 is also equipped with a manual sampling door 310. Operators can manually interrupt or resume the feeding process at any time according to actual needs through the manual sampling door 310, which avoids the problems of sample spillage, mixing or excessive sampling when changing the sampling bucket 311, and ensures that the weight of the sample taken out each time is accurate and controllable.

[0042] In this embodiment, a manual valve 11 is installed upstream of the connection point between the sampling pipeline 2 and the urea storage tank conveying pipeline 1, and a manual valve 12 is installed downstream of the connection point. A manual sampling valve 21 is also installed upstream of the sampling pneumatic valve 22.

[0043] By setting up a manual valve 11 upstream and a manual valve 12 downstream of the sampling connection point, independent isolation of the section where the sampling branch is located is achieved. The setting of the sampling manual valve 21 further enhances the dual isolation protection of the sampling pipeline 2.

[0044] Example 2 Please see Figures 2-7 In this embodiment, the urea granule pneumatic conveying pipeline sampling device is based on the above embodiment one, with a feeding auxiliary device 4 fixedly installed at the bottom of the feeding cylinder 38.

[0045] Specifically, the feeding auxiliary device 4 includes a slide rail 42, on which a drive block 44 is slidably mounted. A limiting groove 46 is provided along the length of the slide rail 42 near the feeding tube 39. A connecting rod is slidably engaged in the limiting groove 46. One end of the connecting rod is fixedly connected to the drive block 44, and the other end of the connecting rod is fixedly connected to a drive magnetic ring 47. The drive magnetic ring 47 is movably sleeved outside the feeding tube 39. A magnetic scraper ring 5 is also provided inside the feeding tube 39, which magnetically engages with the drive magnetic ring 47. The magnetic scraper ring 5 is movably fitted against the inner wall of the feeding tube 39.

[0046] As can be seen from the above description, the drive block 44 on the slide rail 2 42 can slide self-driven. The drive block 44 drives the drive magnetic ring 47 at the other end to move synchronously along the axial direction of the feed tube 39 through the connecting rod fixedly connected to it.

[0047] Since the feed tube 39 is equipped with a magnetic scraper ring 5 that magnetically engages with the drive magnetic ring 47, and the magnetic scraper ring 5 is movably attached to the inner wall of the feed tube 39, when the drive block 44 drives the drive magnetic ring 47 to move up and down along the outer wall of the feed tube 39, it can drive the magnetic scraper ring 5 to move synchronously. During the movement, the magnetic scraper ring 5 is in close contact with the inner wall of the feed tube 39, scraping off urea particles that may adhere to the tube wall, thereby preventing material accumulation or blockage on the inner wall of the feed tube 39.

[0048] Furthermore, four fixing plates 3901 are evenly fixed along the circumference of the inner wall of the feeding pipe 39, and magnetic scraper rings 5 ​​are spaced apart on the top of the fixing plates 3901. Each magnetic scraper ring 5 is fixedly connected to a lifting spring 3902.

[0049] As can be seen from the above description, when the drive block 44 drives the drive magnetic ring 47 to move along the outer wall of the feed tube 39, the magnetic scraper ring 5 moves downward against the elastic force of the lifting spring 3902. When the drive magnetic ring 47 moves to the end of its stroke, the elastic force of the lifting spring 3902 is greater than the magnetic attraction force of the drive magnetic ring 47. At this time, the lifting spring 3902, which is in a compressed state, releases its elastic potential energy and pushes the magnetic scraper ring 5 upward to scrape off the attached material. Through the setting of the fixing plate 3901 and the lifting spring 3902, the problem of the magnetic scraper ring 5 detaching from the control of the drive magnetic ring 47 when the adhesion of the attached material is large can be avoided. The entire scraping process is driven by the elastic force of the lifting spring 3902, which has good stability.

[0050] Meanwhile, in another embodiment, the magnetic scraper ring 5 can be driven by the driving magnetic ring 47 throughout the scraping operation. In this case, the lifting spring 3902 plays a role in resetting the magnetic scraper ring 5. That is, when the magnetic scraper ring 5 is disengaged from the control of the driving magnetic ring 47 due to the excessive adhesion of the attached material, the lifting spring 3902 can be used to restore the magnetic scraper ring 5 to its original position, so that the driving magnetic ring 47 can continue to attract the magnetic scraper ring 5 to complete the scraping operation.

[0051] Furthermore, the magnetic scraper ring 5 includes a circular ring body and a conical ring body integrally disposed at the top of the circular ring body. A scraping slope 51 is provided on the inner side of the conical ring body. During the upward scraping process, the scraping slope 51 moves from bottom to top, which can better remove the accumulated material layer from the wall surface and loosen it diagonally upward.

[0052] Furthermore, the feeding auxiliary device 4 also includes a slide rail 41 that is fixedly mounted on the side of the slide rail 42. A sliding block 43 is slidably installed on the slide rail 41. An impact rod 45 is fixedly connected to the bottom end of the sliding block 43. Fixed blocks 48 are spaced apart at the top of the sliding block 43. A storage spring 410 is also provided between the fixed block 48 and the sliding block 43. A vibrating ring 312 is fixedly sleeved on the feeding pipe 39. A linkage component is provided between the sliding block 43 and the drive block 44. The sliding block 43 drives the impact rod 45 to strike the vibrating ring 312 through the linkage component.

[0053] Specifically, the linkage assembly includes a toggle block 411, a telescopic rod 4301, and a lever 4401. The toggle block 411 is fixed between the sliding block 43 and the driving block 44. The telescopic rod 4301 is elastically telescopically arranged on the side of the sliding block 43 near the driving block 44. The lever 4401 is fixedly arranged on the side of the driving block 44 near the sliding block 43. The toggle block 411 is provided with a toggle inclined surface 412 on the side near the vibrating ring 312. The sliding block 43 is provided with a counter-sloping surface 4302 that can cooperate with the toggle inclined surface 412. The lever 4401 and the toggle block 411 are misaligned.

[0054] The sliding block 43 is provided with a sliding groove on the side near the driving block 44. A spring is provided at the inner end of the sliding groove. The telescopic rod 4301 is slidably installed in the sliding groove and fixedly connected to the free end of the spring.

[0055] As can be seen from the above description, when the drive block 44 moves upward along the slide rail 42, the lever 4401 fixed on it moves upward accordingly. Since the lever 4401 and the actuating block 411 are misaligned, the lever 4401 first contacts the telescopic rod 4301. The lever 4401 will drive the telescopic rod 4301 and the sliding block 43 to move upward synchronously. At this time, the storage spring 410 is compressed.

[0056] After the sliding block 43 moves a certain distance, the actuating inclined surface 412 and the opposing inclined surface 4302 will come into contact. At this time, under the action of the actuating inclined surface 412, the opposing inclined surface 4302 will be forced to retract the telescopic rod 4301. When the telescopic rod 4301 retracts, it will disengage from the lever 4401. Since the energy storage spring 410 is compressed at this time, the elastic force of the energy storage spring 410 is released at the instant the telescopic rod 4301 disengages from the lever 4401, which will cause the impact rod 45 to quickly strike the vibrating ring 312.

[0057] During this process, because the lever 4401 and the actuating block 411 are misaligned, the lever 4401 will not touch the actuating block 411 during the movement.

[0058] When the drive block 44 returns to its original position, the lever 4401 will press against the top inclined surface 4302, causing the telescopic rod 4301 to extend or retract. Therefore, the telescopic rod 4301 will not jam the drive block 44.

[0059] During each vibration cycle, the magnetic scraper ring 5 also performs a scraping action. The scraping action breaks the adhesion between the material layer and the pipe wall, changing it from a stuck state to a loose state. The subsequent vibration impact uses high-frequency vibration to make these loosened particles slide down quickly. The combination of the two solves the problems of easy residue from scraping alone and poor effect of vibration alone on large material accumulations.

[0060] Furthermore, a guide rod 49 is vertically fixedly connected to the fixed block 48, and the energy storage spring 410 is sleeved on the guide rod 49, which can effectively prevent the energy storage spring 410 from radially bending or shifting during compression and release.

[0061] Furthermore, multiple strong magnetic adsorption pillars 6 are uniformly embedded along the circumference of the side of the circular ring, enabling the magnetic scraper ring 5 to respond more sensitively and stably to the movement of the driving magnetic ring 47.

[0062] The working principle of this invention is as follows: During normal operation, the manual door 11 before the pipe, the manual door 12 after the pipe, and the sampling manual valve 21 are kept open, and the sampling pneumatic valve 22 is automatically opened and closed according to a preset program (such as opening for ten seconds every five minutes).

[0063] When the sampling pneumatic valve 22 is opened, the urea particles in the gas-solid mixture state are driven by the compressed air in the urea storage tank conveying pipeline 1, and are drawn out through the sampling pipeline 2, enter the receiving chamber at the top of the protective box 31, and fall directly into the buffer mesh cylinder 36. The cylinder wall of the buffer mesh cylinder 36 consumes the kinetic energy of the urea particles, causing them to slow down and fall. At the same time, the high-pressure gas escapes through the mesh, completing the gas-solid separation.

[0064] The separated gas flows to the side of the receiving chamber away from the sampling pipe 2. After being blocked by the exhaust baffle 35, it enters the exhaust pipe 34 through the exhaust hole and is finally filtered by the filter bag 3401 and discharged cleanly.

[0065] The separated urea particles fall to the bottom of the receiving chamber under the action of gravity, enter the feeding pipe 39 through the feeding cylinder 38, and finally fall into the sampling bucket 311 in the sampling chamber to complete the cumulative sampling.

[0066] During the feeding process, the feeding auxiliary device 4 works synchronously to prevent blockage: on the one hand, the drive block 44 moves back and forth along the slide rail 42, and drives the magnetic scraper ring 5 in the feeding tube 39 to move up and down through magnetic coupling. The scraping slope 51 of the magnetic scraper ring 5 cooperates with the circular ring to scrape and clean the tube wall. At the same time, the strong magnetic adsorption column 6 embedded on the circular ring enhances the magnetic coupling force and ensures that the scraper ring moves reliably.

[0067] When the drive block 44 moves upward, the lever 4401 drives the telescopic rod 4301 and the sliding block 43 to move upward, compressing the storage spring 410. When the lever inclined surface 412 contacts the top inclined surface 4302, forcing the telescopic rod 4301 to retract and disengage from the lever 4401, the storage spring 410 is released instantly, pushing the impact rod 45 to quickly strike the vibrating ring 312 downward, generating strong vibration. The magnetic scraper ring 5 and the impact vibration are combined to complete the scraping and vibration actions in a short time, clearing the accumulated material on the inner wall of the feed pipe 39 and pushing it downward.

[0068] During the sampling process, the operator can observe the status of the material in the chamber in real time through the observation window 33 on the upper cover 32. When the sample amount in the sampling bucket 311 reaches the required weight, the manual discharge door 310 can be closed, the sampling bucket 311 can be taken out and replaced with an empty bucket, and then the manual discharge door 310 can be reopened to resume sampling. When the device needs to be inspected and maintained, the manual door 11 before the pipe, the manual door 12 after the pipe and the manual sampling valve 21 can be closed to achieve safe isolation. At the same time, the internal components can be easily operated by removing the upper cover 32.

[0069] In the description of this invention, it should be noted that the terms "inner", "outer", "upper", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limiting this invention.

[0070] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the term "connection" should be interpreted broadly. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be a connection within two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0071] Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

Claims

1. A sampling device for a pneumatic conveying pipeline of urea granules, characterized in that: The sampling component (3) includes a protective box (31). The top of the protective box (31) is a receiving chamber, and the bottom of the protective box (31) is a taking chamber. A discharge cylinder (38) is provided between the receiving chamber and the taking chamber. The receiving chamber is equipped with a buffer mesh cylinder (36), and the side of the protective box (31) is connected to a sampling pipe (2). The inlet of the sampling pipe (2) is connected to the urea storage tank conveying pipe (1). The outlet of the sampling pipe (2) is located at the top inlet of the buffer mesh cylinder (36), and a sampling pneumatic valve (22) that can be started at a time is installed on the sampling pipe (2). The sampling chamber is equipped with a sampling bucket (311), and the bottom end of the feeding cylinder (38) is connected to a feeding pipe (39). The free end of the feeding pipe (39) is located at the inlet of the sampling bucket (311).

2. The urea granule pneumatic conveying pipeline sampling device according to claim 1, characterized in that: The bottom end of the feeding cylinder (38) is fixedly installed with a feeding auxiliary device (4). The feeding auxiliary device (4) includes a slide rail two (42). A drive block (44) is slidably installed on the slide rail two (42). A limiting groove (46) is opened through the slide rail two (42) along the length direction near the feeding tube (39). A connecting rod is slidably engaged in the limiting groove (46). One end of the connecting rod is fixedly connected to the drive block (44). The other end of the connecting rod is fixedly connected to a drive magnetic ring (47). The drive magnetic ring (47) is movably sleeved outside the feeding tube (39). A magnetic scraper ring (5) is also provided inside the feeding tube (39) and magnetically attracted to the drive magnetic ring (47). The magnetic scraper ring (5) is movably attached to the inner wall of the feeding tube (39).

3. The urea granule pneumatic conveying pipeline sampling device according to claim 2, characterized in that: The inner wall of the feed pipe (39) is uniformly fixed with several fixing plates (3901) along the circumference. Magnetic scraper rings (5) are spaced apart on the top of the fixing plates (3901), and lifting springs (3902) are fixedly connected between the magnetic scraper rings (5) and each fixing plate (3901).

4. A urea granule pneumatic conveying pipeline sampling device according to claim 2, characterized in that: The magnetic scraping ring (5) includes a circular ring body and a conical ring body integrally disposed at the top of the circular ring body, and a scraping inclined surface (51) is provided on the inner side of the conical ring body.

5. A urea granule pneumatic conveying pipeline sampling device according to claim 2, characterized in that: The feeding auxiliary device (4) also includes a slide rail (41) fixed in parallel on the side of the slide rail (42). A sliding block (43) is slidably installed on the slide rail (41). An impact rod (45) is fixedly connected to the bottom of the sliding block (43). A fixed block (48) is spaced at the top of the sliding block (43). A storage spring (410) is also provided between the fixed block (48) and the sliding block (43). A vibrating ring (312) is fixedly sleeved on the feeding pipe (39). A linkage component is provided between the sliding block (43) and the driving block (44). The sliding block (43) drives the impact rod (45) to strike the vibrating ring (312) through the linkage component.

6. A urea granule pneumatic conveying pipeline sampling device according to claim 5, characterized in that: The linkage assembly includes a toggle block (411), a telescopic rod (4301), and a lever (4401). The toggle block (411) is fixed between the sliding block (43) and the driving block (44). The telescopic rod (4301) is elastically telescopically arranged on the side of the sliding block (43) near the driving block (44). The lever (4401) is fixedly arranged on the side of the driving block (44) near the sliding block (43). The toggle block (411) is provided with a toggle inclined surface (412) on the side near the vibrating ring (312). The sliding block (43) is provided with a counter-sloping surface (4302) that can cooperate with the toggle inclined surface (412). The lever (4401) and the toggle block (411) are misaligned.

7. A urea granule pneumatic conveying pipeline sampling device according to claim 5, characterized in that: A guide rod (49) is vertically fixed to the fixed block (48), and a storage spring (410) is sleeved on the outside of the guide rod (49).

8. A urea granule pneumatic conveying pipeline sampling device according to claim 4, characterized in that: The circular ring body has multiple strong magnetic adsorption columns (6) evenly embedded along its circumference on its side surface.

9. A urea granule pneumatic conveying pipeline sampling device according to claim 1, characterized in that: The receiving chamber is provided with an exhaust hole on the side away from the outlet of the sampling pipe (2). An exhaust pipe (34) is connected to the exhaust hole. A filter bag (3401) is connected to the free end of the exhaust pipe (34). An exhaust baffle (35) is also provided at the exhaust hole.

10. A urea granule pneumatic conveying pipeline sampling device according to claim 1, characterized in that: The protective box (31) is provided with a detachable upper cover (32) on the top, and an observation window (33) is provided on the upper cover (32); the discharge pipe (39) is also provided with a manual sampling door (310); the upstream and downstream positions of the connection point between the sampling pipe (2) and the urea storage tank conveying pipe (1) are respectively provided with a manual door (11) before the pipe and a manual door (12) after the pipe, and a manual sampling valve (21) is also provided upstream of the sampling pneumatic valve (22).

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