Plastic particle online sampling system

Abstract

The invention relates to the technical field of plastic particle production, and particularly discloses a plastic particle online sampling system, which comprises a feeding mechanism including a buffer hopper, a finished product hopper, a conveying pipe and a first fan; the sampling mechanism comprises a sampling pipe, a first valve body, a second valve body, a third valve body, a cyclone separator, a collecting box and a second fan, the sampling pipe is connected to the conveying pipe, the cyclone separator is connected to the end, away from the conveying pipe, of the sampling pipe, and the collecting box is arranged at the discharging end of the cyclone separator; the first valve body and the second valve body are both arranged on the sampling pipe, a branch pipe is arranged on the sampling pipe and between the first valve body and the second valve body, and the third valve body and the second fan are both arranged on the branch pipe; the guide mechanism comprises a guide piece, a baffle and a first motor. According to the sampling device, the inner wall of the sampling pipe can be cleaned, plastic particles in the previous sampling process are prevented from being taken out in the next sampling process, and the sampling accuracy can be guaranteed.

Description

Technical Field

[0001] The present application relates to the technical field of plastic particle production, and in particular to an online sampling system for plastic particles. Background Art

[0002] In the process of producing plastic granules, the granulator may produce defective products because the raw materials do not meet the standards or are mixed with impurities. Therefore, after the production of plastic granules is completed, sampling and testing are required to determine whether the produced plastic granules meet the requirements.

[0003] Usually, when testing plastic particles, a sampling tube is set on the conveying pipe of the plastic particles, and a valve body is set on the sampling tube. When sampling is required, the valve body is opened to allow part of the plastic particles in the conveying pipe to be discharged through the sampling tube. After sampling is completed, the valve body is closed to achieve online sampling.

[0004] Due to the adsorption of static electricity, after a sampling is completed, some plastic particles will adhere to the inner wall of the sampling tube. When another sampling is required after a period of production, when the valve body is opened again for sampling, the plastic particles attached to the inner wall of the pipe during the previous sampling process will mix with the plastic particles during this sampling process, resulting in cross contamination between samples and affecting the accuracy of this sampling. Summary of the invention

[0005] In order to reduce the impact of the previous sampling on the current sampling, the present application provides an online sampling system for plastic particles.

[0006] The present application provides an online sampling system for plastic particles using the following technical solutions: A plastic particle online sampling system, comprising: The feeding mechanism includes a buffer hopper, a finished product hopper, a conveying pipe and a first fan, wherein the conveying pipe is connected between the buffer hopper and the finished product hopper, and the air outlet side of the first fan is connected to the conveying pipe so that the plastic particles in the buffer hopper enter the finished product hopper through the conveying pipe; The sampling mechanism comprises a sampling tube, a first valve body, a second valve body, a third valve body, a cyclone separator, a collecting box and a second fan, wherein the sampling tube is connected to the conveying tube, the cyclone separator is connected to an end of the sampling tube away from the conveying tube, the collecting box is arranged at the discharge end of the cyclone separator, the first valve body and the second valve body are both arranged on the sampling tube, a branch pipe is arranged on the sampling tube between the first valve body and the second valve body, and the third valve body and the second fan are both arranged on the branch pipe; The guide mechanism includes a guide member, a baffle and a first motor, wherein the guide member is located in the conveying pipe, the guide member includes a top plate and side plates arranged on both sides of the top plate, the side plate is fixedly arranged at one end of the sampling tube, the side plate is arranged along the conveying direction of the conveying pipe, the baffle is located between the two side plates, the baffle is rotatably connected to the side of the side plate away from the first fan, the baffle is used to close the gap between the two side plates or the end of the sampling tube, the first motor is arranged on the conveying pipe, and the output shaft of the first motor is connected to the baffle.

[0007] By adopting the above technical solution, when the first valve body and the second valve body are opened, the plastic particles in the conveying pipe can enter the cyclone separator through the sampling pipe, and the cyclone separator can separate the plastic particles in the airflow and discharge the plastic particles into the collection box, thereby realizing online sampling, that is, the sampling process does not affect the transportation of the plastic particles in the conveying pipe, which helps to ensure the transportation efficiency; when the first valve body is closed, the second valve body and the third valve body are opened, and the second fan is started, the second fan can blow air into the sampling pipe to blow off the plastic particles attached to the inner wall of the lower end of the sampling pipe, and the blown plastic particles can enter the cyclone with the airflow In the air separator, the inner wall of the sampling tube is cleaned; when the second valve body is closed, the first valve body and the third valve body are opened, and the second fan is started, the second fan can blow air into the sampling tube to blow down the plastic particles attached to the inner wall of the upper end of the sampling tube, and the blown-off plastic particles can enter the conveying pipe along with the air flow, and then continue to be conveyed along the conveying pipe; therefore, the second fan can blow and clean the inner wall of the sampling tube, remove the plastic particles attached to the inner wall of the sampling tube, thereby preventing the plastic particles attached to the inner wall of the sampling tube in the previous sampling from being removed in the next sampling, thereby ensuring the accuracy of sampling; During the sampling process, the baffle is vertically arranged to close the gap between the two side plates. Therefore, the enclosure structure composed of the top plate, side plates and baffles can guide part of the airflow, so that the airflow flowing into the interior of the enclosure area can flow into the sampling tube more smoothly, thereby increasing the sampling volume and ensuring the sampling efficiency. After the sampling is completed, the motor drives the baffle to rotate to a horizontal state. At this time, the baffle closes the top of the sampling tube. Therefore, after the inner wall of the sampling tube is cleaned, the baffle can close the top of the sampling tube, making it difficult for the plastic particles in the conveying tube to enter the sampling tube. The baffle can be opened for sampling next time to ensure the accuracy of the sampling. In addition, since the baffle is in a horizontal state when not sampling, the influence of the baffle on the conveying process of the plastic particles can be weakened.

[0008] Optionally, a windshield block is provided on the conveying pipe, and the windshield block is located on the side of the side plate away from the baffle plate. The windshield block is rotatably connected to the conveying pipe, and a second motor for driving the windshield block to rotate is provided on the conveying pipe.

[0009] By adopting the above technical solution, the wind shield block can block the wind blown by the second fan, change the flow direction of the wind blown by the second fan, so that the wind blown by the second fan can converge with the wind blown by the first fan in the conveying pipe after flowing out from the gap between the wind shield block and the side plate, and the converged wind continues to be conveyed, thereby ensuring the conveying effect; it prevents the wind blown by the second fan from being discharged through the sampling tube in the opposite direction to the flow direction of the wind blown by the first fan in the conveying pipe, thereby affecting the conveying of plastic particles.

[0010] Optionally, the wind shield block is a fan-shaped block, and an avoidance hole is provided on the inner wall of the conveying pipe, and the wind shield block can abut against the inner wall of the avoidance hole.

[0011] By adopting the above technical solution, the side wall of the wind shield block abuts against the inner wall of the avoidance hole, so that the plastic particles in the conveying pipe are not easy to leak out through the avoidance hole; compared with the plate-shaped structure, the fan-shaped setting makes it difficult for plastic particles to accumulate under the wind shield block, thereby ensuring the smooth rotation of the wind shield block.

[0012] Optionally, a connecting column is fixedly provided in the tube wall of the sampling tube, and a knocking mechanism is also provided in the tube wall of the sampling tube, the knocking mechanism includes a rotating rod, a connecting plate, a knocking block, a first torsion spring and a driving assembly, the rotating rod is rotatably connected to the tube wall of the sampling tube, the connecting plate is fixedly connected to the rotating rod, the knocking block is rotatably connected to the tube wall of the sampling tube, the first torsion spring is connected between the knocking block and the tube wall of the sampling tube, the first torsion spring makes the knocking block press against the connecting column, and the driving assembly is used to drive the rotating rod and the connecting plate to rotate, so that when the connecting plate rotates, the knocking block is pushed to rotate to the side away from the connecting column.

[0013] By adopting the above technical solution, the driving assembly drives the rotating rod and the connecting plate to rotate, and the connecting plate can push the knocking block to rotate to the side away from the connecting column. When the connecting plate is out of contact with the knocking block, the first torsion spring can make the knocking block rotate in the opposite direction and reset, so that the knocking block knocks on the connecting column, thereby causing the connecting column and the inner wall of the sampling tube to vibrate, and vibrate off the plastic particles attached to the inner wall of the sampling tube, thereby preventing the plastic particles attached to the inner wall of the sampling tube from entering the next sampling, which helps to ensure the accuracy of the sampling.

[0014] Optionally, the driving assembly includes an air inlet pipe and a filter, a receiving groove is opened in the tube wall of the sampling tube, the receiving groove includes an air inlet portion, a receiving portion and an air outlet portion, the air inlet portion and the air outlet portion are respectively arranged on both sides of the receiving portion, the rotating rod, the connecting plate, the knocking block and the first torsion spring are all arranged in the receiving portion, one end of the air inlet pipe is connected to the air inlet portion, the other end of the air inlet pipe is located in the delivery pipe, and the filter is arranged at one end of the air inlet pipe located in the delivery pipe.

[0015] By adopting the above technical solution, the wind in the conveying pipe can flow into the air inlet pipe, the air inlet part and the accommodating part in sequence. The wind entering the accommodating part can cause the connecting plate to rotate. Therefore, the rotation of the connecting plate and the rotating rod does not require an additional power source, which is more energy-efficient.

[0016] Optionally, the air inlet pipe is located on a side of the baffle away from the first fan, a ventilation hole is provided on the baffle, a guide shell is provided on a side of the baffle close to the air inlet pipe, and an opening for connecting with the air inlet pipe is provided on a side of the guide shell away from the baffle.

[0017] By adopting the above technical solution, part of the wind blown out by the second fan can flow out into the conveying pipe to convey the plastic particles remaining in the sampling tube to the conveying pipe, and the other part can flow into the guide shell, the air inlet pipe, the air inlet part and the accommodating part in sequence, thereby increasing the air intake volume in the air inlet pipe, helping to enhance the pushing effect on the connecting plate, increasing the rotation speed of the connecting plate, thereby increasing the knocking frequency of the knocking block on the connecting column, helping to enhance the vibration effect of the inner wall of the sampling tube, thereby enhancing the cleaning effect.

[0018] Optionally, a filter plate is provided on the baffle.

[0019] By adopting the above technical solution, the filter plate can block the plastic particles entering between the two side plates, thereby reducing the possibility of clogging of the ventilation holes on the baffle.

[0020] Optionally, the filter plate is rotatably connected to the baffle, and an inclined limit plate is provided on the baffle. A second torsion spring is connected between the filter plate and the baffle, and the second torsion spring makes the filter plate press against the limit plate. The side plate is provided with a first support rod and a second support rod for abutting the filter plate, the first support rod is used to drive the filter plate to rotate toward the side close to the baffle, and the second support rod is used to drive the filter plate to rotate toward the side away from the baffle, and a connecting assembly is provided between the baffle and the filter plate, and the connecting assembly is used to temporarily connect the filter plate and the baffle together.

[0021] By adopting the above technical solution, when the baffle is in a horizontal state, the filter plate and the baffle are temporarily connected together, and the filter plate is also in a horizontal state; when the baffle rotates upward, it can drive the filter plate to rotate, and the filter plate abuts against the second support rod, so that the filter plate can rotate relative to the baffle to the side away from the baffle. At this time, the connection of the connecting assembly is disconnected, so that the second torsion spring can make the filter plate quickly rotate in the opposite direction and reset, and make the filter plate abut against the limit plate. Therefore, when the filter plate abuts against the limit plate during the resetting process, vibration can be generated, thereby vibrating off the plastic particles attached to or blocked on the filter plate, which helps to ensure the cleaning effect of the filter plate. On the one hand, it can ensure the smooth flow of the filter plate, so that the air can smoothly pass through the filter plate. On the other hand, it can reduce the crossover between samples in the two samplings, which helps to ensure the accuracy of sampling.

[0022] Optionally, the connecting assembly includes a first magnet block and a second magnet block, the first magnet block is fixedly connected to the filter plate, the second magnet block is fixedly connected to the baffle plate, and the magnetic poles of the first magnet block and the second magnet block on a side close to each other are in opposite directions.

[0023] By adopting the above technical solution, when the first magnet block and the second magnet block are attached to each other, they can be attracted to each other, thereby realizing a temporary connection between the filter plate and the baffle.

[0024] Optionally, a flexible bag is connected between the filter plate and the baffle.

[0025] By adopting the above technical solution, the bag body can seal the area between the filter plate and the baffle, thereby preventing the plastic particles from being blown into this area during the blowing process of the second fan, so that the plastic particles in the sampling tube can be transported to the conveying pipe by the wind blown by the second fan, thereby ensuring the accuracy of the sampling.

[0026] In summary, this application includes the following beneficial technical effects: 1. The second fan can blow air into the sampling tube to blow off the plastic particles attached to the inner wall of the sampling tube and transport these plastic particles to the conveying pipe, thereby preventing the plastic particles in the previous sampling from being taken out during the next sampling process, which helps to ensure the accuracy of sampling.

[0027] 2. The enclosure structure composed of the top plate, side plates and baffles can guide the airflow in the conveying pipe, thereby making it easier for the airflow in the conveying pipe to enter the sampling tube through the enclosure area, which helps to ensure the sampling efficiency.

[0028] 3. The wind blown out by the second fan can also flow into the guide shell, the air inlet pipe, the air inlet part and the accommodating part in sequence, so that the connecting plate rotates, and the connecting plate rotates the knocking block, so that the knocking block knocks on the connecting column, causing the inner wall of the sampling tube to vibrate, thereby helping to enhance the cleaning effect of the inner wall of the sampling tube, thereby ensuring the accuracy of sampling. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 It is a schematic diagram of the overall structure of an embodiment of the present application; Figure 2 is a cross-sectional view of an embodiment of the present application; Figure 3 yes Figure 2 The enlarged schematic diagram of point A in the middle; Figure 4 is a cross-sectional view of the windshield block after it is rotated upward in the embodiment of the present application; Figure 5 is a cross-sectional view of an embodiment of the present application for illustrating a striking mechanism; Figure 6 yes Figure 5 The enlarged schematic diagram of point B in the middle; Figure 7 It is a schematic diagram of the structure of the filter plate and the baffle plate used in the embodiment of the present application; Figure 8 is a structural schematic diagram of an embodiment of the present application for showing the positions of the first support rod and the second support rod; Fig. 9 is a cross-sectional view of the embodiment of the present application after the baffle is rotated downward; Fig.10 yes Fig. 9 Enlarged schematic diagram of point C in the middle.

[0030] Reference numerals: 1, feeding mechanism; 11, buffer hopper; 12, finished product hopper; 13, conveying pipe; 131, avoidance hole; 14, first fan; 15, rotary valve; 2, sampling mechanism; 21, sampling tube; 22, first valve body; 23, second valve body; 24, third valve body; 25, cyclone separator; 26, collecting box; 27, second fan; 271, branch pipe; 3, guide mechanism; 31, top plate; 32, side plate; 321, first support rod; 322, second support rod; 33, baffle; 331, ventilation hole; 33 2. Guide shell; 3321. Opening; 333. Notch; 34. First motor; 4. Wind shield; 5. Second motor; 6. Connecting column; 7. Knocking mechanism; 71. Turning rod; 72. Connecting plate; 73. Knocking block; 74. First torsion spring; 75. Driving assembly; 751. Air inlet pipe; 752. Filter; 8. Receiving groove; 81. Air inlet part; 82. Receiving part; 83. Air outlet part; 9. Filter plate; 10. Limiting plate; 16. Second torsion spring; 17. Connecting assembly; 171. First magnet block; 172. Second magnet block. DETAILED DESCRIPTION

[0031] The following combination Figure 1-Figure 10 This application is described in further detail.

[0032] The present application embodiment discloses an online sampling system for plastic particles. Figure 1 and Figure 2The online sampling system for plastic particles includes a feeding mechanism 1, which includes a buffer hopper 11, a finished product hopper 12, a conveying pipe 13 and a first fan 14. The two ends of the conveying pipe 13 are respectively connected to the buffer hopper 11 and the finished product hopper 12, and a rotary valve 15 is also connected between the buffer hopper 11 and the conveying pipe 13, and the rotary valve 15 is used for continuous conveying and quantitative feeding. The first fan 14 is fixedly connected to the end of the conveying pipe 13, and the air outlet side of the first fan 14 is located inside the conveying pipe 13. The first fan 14 is used to drive the plastic particles in the conveying pipe 13 to move. Therefore, the produced plastic particles will first fall into the buffer hopper 11, and the plastic particles in the buffer hopper 11 will then fall into the conveying pipe 13 through the rotary valve 15; the first fan 14 blows air into the conveying pipe 13, and the conveying pressure is 100KPa, so that the plastic particles in the conveying pipe 13 move to the finished product hopper 12, completing the conveying of the plastic particles.

[0033] Reference Figure 2 A sampling mechanism 2 is provided on one side of the conveying pipe 13, and the sampling mechanism 2 includes a sampling pipe 21, a first valve body 22, a second valve body 23, a third valve body 24, a cyclone separator 25, a collecting box 26 and a second fan 27. The sampling pipe 21 is fixedly connected to the bottom wall of the conveying pipe 13 between the buffer hopper 11 and the finished product hopper 12, and the top of the sampling pipe 21 is connected to the inside of the conveying pipe 13. The cyclone separator 25 is provided on one side of the sampling pipe 21, and the feeding end of the cyclone separator 25 is connected to the bottom end of the sampling pipe 21. The collecting box 26 is located below the cyclone separator 25, and the discharging end of the cyclone separator 25 faces the collecting box 26. Therefore, the plastic particles in the conveying pipe 13 can enter the cyclone separator 25 through the sampling pipe 21. Under the action of centrifugal force, the plastic particles will slide down along the inner wall of the cyclone separator 25 due to their heavy weight until they are discharged from the discharging end at the bottom into the collecting box 26. Therefore, the cyclone separator 25 can separate the plastic particles mixed in the gas, thereby completing the sampling process.

[0034] The first valve body 22 and the second valve body 23 are both fixedly connected to the sampling tube 21, the first valve body 22 is located above the second valve body 23, and the first valve body 22 and the second valve body 23 are arranged at intervals. The sampling tube 21 is also fixedly connected to a branch pipe 271, which is in communication with the sampling tube 21 and is located between the first valve body 22 and the second valve body 23. The second fan 27 is fixedly connected to one end of the branch pipe 271 away from the sampling tube 21, and the air outlet side of the second fan 27 is located inside the branch pipe 271; the third valve body 24 is arranged on the branch pipe 271. The first valve body 22, the second valve body 23 and the third valve body 24 are all butterfly valves, and in other embodiments, they can also be ball valves, and any valve body that can control the opening and closing of the pipeline can be used.

[0035] Therefore, during the normal transportation of plastic particles, the first valve body 22, the second valve body 23 and the third valve body 24 are all in a closed state. When sampling is required, the first valve body 22 and the second valve body 23 are opened, and the plastic particles in the conveying pipe 13 can enter the cyclone separator 25 through the sampling tube 21, so as to perform sampling. After taking out a certain amount of plastic particles, the first valve body 22 is closed, the third valve body 24 is opened, and the second fan 27 is started. The second fan 27 can blow air into the branch pipe 271 and the sampling tube 21, and the conveying pressure is 600KPa, so that the plastic particles attached to the inner wall of the bottom end of the sampling tube 21 can be blown off and enter the cyclone separator 25. Then the second valve body 23 and the third valve body 24 are closed, and the first valve body 22, the second valve body 23 and the third valve body 24 are all in a closed state, and the sampling process is completed.

[0036] When sampling is required again, the first valve body 22 and the third valve body 24 are opened, and the second fan 27 is started. The second fan 27 blows air into the sampling tube 21 to transport the plastic particles inside the top of the sampling tube 21 to the conveying pipe 13. Then the third valve body 24 is closed, the second valve body 23 is opened, and the second fan 27 stops running, so that the plastic particles in the conveying pipe 13 can flow into the sampling tube 21 and the cyclone separator 25, so as to perform sampling. Therefore, the second fan 27 can clear the plastic particles attached to the inner wall of the sampling tube 21, thereby reducing the influence of the plastic particles left in the previous sampling on the next sampling process, which helps to ensure the accuracy of sampling.

[0037] Among them, the wind pressure generated by the second fan 27 is greater than the wind pressure generated by the first fan 14, so the first valve body 22 and the third valve body 24 are opened. When the second fan 27 blows air into the sampling tube 21, the plastic particles in the sampling tube 21 are blown into the conveying pipe 13, and the plastic particles in the conveying pipe 13 cannot flow into the sampling tube 21, thereby ensuring the unidirectional flow of the plastic particles in the sampling tube 21, which helps to ensure the cleaning effect of the residual plastic particles in the sampling tube 21, thereby ensuring the accuracy of sampling.

[0038] Reference Figure 1 and Figure 3, a guide mechanism 3 is also provided in the conveying pipe 13, and the guide mechanism 3 includes a guide member, a baffle 33 and a first motor 34. The guide member is located above the sampling tube 21, and the guide member includes a top plate 31 and a side plate 32; the side plate 32 is arranged along the conveying direction of the conveying pipe 13, and two side plates 32 are arranged in parallel and spaced apart, the top of the side plate 32 is fixedly connected to the top plate 31, and the bottom of the side plate 32 is fixedly connected to the top wall of the sampling tube 21. The baffle 33 is arranged between the two side plates 32, and one end of the baffle 33 is hinged to the bottom of the side plate 32. When the baffle 33 is in a vertical state, the baffle 33 can close the end of the two side plates 32 away from the first fan 14; at this time, the top plate 31, the two side plates 32 and the baffle 33 can block the airflow in the conveying pipe 13, and a part of the airflow mixed with plastic particles can directly flow into the area between the two side plates 32, and then flow into the sampling tube 21, which is helpful for better sampling. When the baffle 33 is in a horizontal state, the baffle 33 can close the top of the sampling tube 21, and the plastic particles can be transported at this time, and the plastic particles are not easy to enter the sampling tube 21. The first motor 34 is fixedly connected to the conveying tube 13, and the output shaft of the first motor 34 is horizontally arranged. The output shaft of the first motor 34 is fixedly connected to the baffle 33, so that the first motor 34 can drive the baffle 33 to rotate.

[0039] The output shaft of the first motor 34 can be self-locking, so the baffle 33 can stay at the current position after the baffle 33 stops rotating, which helps to ensure the stability of the baffle 33.

[0040] Reference Figure 3 and Figure 4 Furthermore, a windshield block 4 is also provided in the conveying pipe 13, and the cross section of the windshield block 4 is fan-shaped. The windshield block 4 is located on the side of the side plate 32 away from the baffle 33, and the windshield block 4 is hinged on the inner wall of the conveying pipe 13, and the hinge axis of the windshield block 4 is coaxially arranged with its own axis. Correspondingly, a avoidance hole 131 is provided at the bottom of the conveying pipe 13, and the avoidance hole 131 can be abutted against the side wall of the windshield block 4, so that the plastic particles in the conveying pipe 13 are not easy to leak out through the avoidance hole 131, which helps to ensure the smooth rotation of the windshield block 4. A second motor 5 is fixedly connected to the conveying pipe 13, and the output shaft of the second motor 5 is horizontally arranged, and the output shaft of the second motor 5 is fixedly connected to the windshield block 4, so that the second motor 5 can drive the windshield block 4 to rotate. When the wind shield 4 is located above the avoidance hole 131, the wind shield 4 can block the airflow flowing out of the sampling tube 21, thereby changing the direction of the airflow, so that the airflow flowing out of the sampling tube 21 can converge with the original airflow in the delivery tube 13. When the wind shield 4 is located below the avoidance hole 131, the shielding area of ​​the wind shield 4 can be reduced, so that the airflow in the delivery tube 13 can flow smoothly.

[0041] The output shaft of the second motor 5 can be self-locking, so when the wind shield block 4 stops rotating, the wind shield block 4 can stay at the current position, which helps to ensure the stability of the wind shield block 4.

[0042] Reference Figure 5 and Figure 6 A receiving groove 8 is provided in the inner wall of the sampling tube 21, and a connecting column 6 is fixedly connected in the receiving groove 8, and the axis of the connecting column 6 is arranged along the width direction of the conveying tube 13. A plurality of connecting columns 6 are provided and arranged in a circumferential array. A knocking mechanism 7 is also provided in the receiving groove 8, and the knocking mechanism 7 can knock the connecting column 6, so that the connecting column 6 vibrates, thereby vibrating the inner wall of the sampling tube 21, and vibrating off the plastic particles attached to the inner wall of the sampling tube 21, thereby enhancing the cleaning effect of the inner wall of the sampling tube 21.

[0043] Reference Figure 6 , the knocking mechanism 7 includes a rotating rod 71, a connecting plate 72, a knocking block 73, a first torsion spring 74 and a driving assembly 75. The accommodating slot 8 includes an air inlet 81, an accommodating portion 82 and an air outlet 83. The air inlet 81 and the air outlet 83 are respectively arranged on both sides of the accommodating portion 82, and the air inlet 81 and the air outlet 83 are both connected to the accommodating portion 82. The rotating rod 71 is arranged along the width direction of the conveying pipe 13, and the rotating rod 71 is rotatably connected to the inner wall of the accommodating portion 82. The connecting plate 72 is fixedly connected to the side wall of the rotating rod 71, and a plurality of connecting plates 72 are provided and arranged in a circular array. A plurality of knocking blocks 73 are provided, and the number of knocking blocks 73 is the same as the number of connecting columns 6, and each knocking block 73 corresponds to a connecting column 6; the knocking block 73 is hinged to the inner wall of the accommodating portion 82. The number of the first torsion springs 74 is the same as the number of the knocking blocks 73. Each first torsion spring 74 corresponds to a knocking block 73. The first torsion spring 74 is fixedly connected between the knocking block 73 and the inner wall of the accommodating portion 82. The first torsion spring 74 makes the knocking block 73 press against the connecting column 6. The driving assembly 75 is used to drive the rotating rod 71 and the connecting plate 72 to rotate.

[0044] Reference Figure 3 and Figure 6, the driving assembly 75 includes an air inlet pipe 751 and a filter screen 752. The air inlet pipe 751 is fixedly connected to the conveying pipe 13, one end of the air inlet pipe 751 is connected to the air inlet portion 81, and the other end of the air inlet pipe 751 is located in the conveying pipe 13. Therefore, the airflow in the conveying pipe 13 can flow into the air inlet portion 81 through the air inlet pipe 751, and then flow into the accommodating portion 82. The airflow can cause the connecting plate 72 to rotate, so that the connecting plate 72 and the knocking block 73 are against each other, and then with the rotation of the connecting plate 72, the knocking block 73 can be rotated to the side away from the connecting column 6, and the first torsion spring 74 is further twisted. When the connecting plate 72 is out of contact with the knocking block 73, the first torsion spring 74 can cause the knocking block 73 to rotate in the opposite direction to reset, so that the knocking block 73 knocks on the connecting column 6, thereby causing the connecting column 6 and the inner wall of the sampling tube 21 to vibrate. The filter screen 752 is fixedly connected to one end of the air inlet pipe 751 located in the delivery pipe 13. The aperture of the filter screen 752 is smaller than the particle size of the plastic particles, so the plastic particles cannot enter the air inlet pipe 751, making it difficult for the receiving groove 8 inside the sampling tube 21 to be blocked, which helps the smooth flow of air.

[0045] In order to enhance the driving force of the airflow on the connecting plate 72, the air inlet pipe 751 is located on the side of the baffle 33 away from the first fan 14. The baffle 33 is provided with a ventilation hole 331, and a plurality of ventilation holes 331 are provided, and the aperture of the ventilation hole 331 is smaller than the particle size of the plastic particles. A guide shell 332 is fixedly connected to the side of the baffle 33 close to the air inlet pipe 751, and the guide shell 332 is arranged in a conical shape, and an opening 3321 is arranged on the side of the guide shell 332 away from the baffle 33. When the baffle 33 is in a vertical state, the opening 3321 on the guide shell 332 abuts against the end of the air inlet pipe 751, so that the interior of the guide shell 332 is connected to the air inlet pipe 751. Therefore, during the sampling process, the plastic particles mixed in the air flow entering between the two side plates 32 can be blocked by the baffle 33, and the plastic particles fall into the sampling tube 21; and a part of the air flow can flow into the guide shell 332 through the ventilation hole 331, and then the air flow in the guide shell 332 can flow into the air inlet pipe 751, the air inlet part 81 and the accommodating part 82 in sequence, thereby increasing the amount of air flowing into the accommodating part 82, increasing the thrust of the air flow on the connecting plate 72, and helping to increase the rotation speed of the connecting plate 72, thereby increasing the knocking frequency of the knocking block 73 on the connecting column 6, and enhancing the vibration effect of the sampling tube 21.

[0046] Reference Figure 3 In order to reduce the possibility of clogging of the ventilation holes 331 on the baffle plate 33, a filter plate 9 is provided on the side of the baffle plate 33 away from the guide shell 332. The filter plate 9 is provided with a plurality of filter holes, and the aperture of the filter holes is smaller than the particle size of the plastic particles. Therefore, the plastic particles entering between the two side plates 32 can be blocked by the filter plate 9, and then fall down along the surface of the filter plate 9 into the sampling tube 21.

[0047] Reference Figure 7and Figure 8 The top of the filter plate 9 is hinged on the baffle 33, and the hinge axis of the filter plate 9 is parallel to the hinge axis of the baffle 33. The top of the baffle 33 is fixedly connected to the limit plate 10, and a second torsion spring 16 is fixedly connected between the filter plate 9 and the baffle 33. Under normal conditions, the second torsion spring 16 is in a twisted state, so that the filter plate 9 is pressed against the limit plate 10, and the filter plate 9 is tilted.

[0048] Reference Figure 8 , Fig. 9 and Fig.10 A connecting assembly 17 is provided between the filter plate 9 and the baffle 33, and the connecting assembly 17 includes a first magnet block 171 and a second magnet block 172. The first magnet block 171 is fixedly connected to the bottom end of the filter plate 9, and the second magnet block 172 is fixedly connected to the bottom end of the baffle 33. The magnetic poles of the first magnet block 171 and the second magnet block 172 on the side close to each other are in opposite directions, so the first magnet block 171 and the second magnet block 172 can be attracted to each other. When the first magnet block 171 and the second magnet block 172 are attracted to each other, the filter plate 9 and the baffle 33 are both in a horizontal state, and the second torsion spring 16 is further twisted.

[0049] Reference Figure 4 , Figure 7 and Figure 8 The side plate 32 is fixedly connected with a first support rod 321 and a second support rod 322 for contacting with the filter plate 9. The first support rod 321 and the second support rod 322 are both arranged along the width direction of the conveying pipe 13. The first support rod 321 is located on the lower side, and the second support rod 322 is located on the higher side. When sampling, the baffle plate 33 is in a vertical state, the filter plate 9 is in an inclined state, the second support rod 322 is located between the baffle plate 33 and the filter plate 9, and the filter plate 9 is pressed against the limit plate 10 under the action of the second torsion spring 16. After the sampling is completed, when the baffle 33 rotates downward, the baffle 33 drives the filter plate 9 to rotate, and the filter plate 9 will abut against the first support rod 321. Since the position of the first support rod 321 is fixed, the first support rod 321 will limit the rotation of the filter plate 9. Therefore, as the baffle 33 rotates downward, the filter plate 9 will rotate relative to the baffle 33 toward the side close to the baffle 33 until the baffle 33 rotates to a horizontal state. At this time, the first magnet block 171 and the second magnet block 172 are attracted to each other, and the filter plate 9 is temporarily fixed to the baffle 33.

[0050] When sampling is required again, the horizontal baffle 33 rotates upward, and the baffle 33 drives the filter plate 9 to rotate together. During the rotation process, the filter plate 9 will abut against the second support rod 322, and then the second support rod 322 limits the rotation of the filter plate 9. Therefore, as the baffle 33 rotates, the filter plate 9 will rotate relative to the baffle 33 to the side away from the baffle 33. At this time, the first magnet block 171 and the second magnet block 172 are separated, and the second torsion spring 16 allows the filter plate 9 to rotate and reset quickly until the filter plate 9 is pressed against the limit plate 10. Therefore, during the process of the filter plate 9 rotating in the opposite direction and pressing against the limit plate 10, the filter plate 9 can vibrate, thereby shaking off the plastic particles attached to or blocked on the filter plate 9, and cleaning the surface of the filter plate 9.

[0051] The baffle plate 33 is provided with a notch 333 for the second support rod 322 to pass through, so that during the rotation of the baffle plate 33 , the second support rod 322 will not interfere with the baffle plate 33 , and the baffle plate 33 can rotate smoothly.

[0052] In addition, a flexible bag body (not shown in the figure) is provided between the filter plate 9 and the baffle 33, and the bag body closes the area between the filter plate 9 and the baffle 33. Therefore, when the second fan 27 blows air into the sampling tube 21, the plastic particles moving upward with the airflow are not easy to enter the area between the filter plate 9 and the baffle 33. Therefore, the plastic particles in the sampling tube 21 can be transported to the conveying pipe 13, thereby reducing the influence of this part of the plastic particles on the subsequent sampling process.

[0053] The second fan 27 can also be set as a negative ion fan, so as to enhance the anti-static effect on the plastic particles, making it difficult for the plastic particles to adhere to the inner wall of the sampling tube 21, which helps to enhance the cleaning effect on the inner wall of the sampling tube 21.

[0054] The implementation principle of an online sampling system for plastic particles in an embodiment of the present application is as follows: the finished plastic particles fall into the buffer hopper 11, and the plastic particles in the buffer hopper 11 enter the conveying pipe 13 under the action of the rotary valve 15. The first fan 14 is in working state, and the first fan 14 blows air into the conveying pipe 13, thereby driving the plastic particles in the conveying pipe 13 to move, and the plastic particles can move through the conveying pipe 13 to the finished product hopper 12.

[0055] In the initial state, the baffle 33 is in a horizontal state, the filter plate 9 is parallel to the baffle 33, the windshield block 4 is located below the avoidance hole 131, and the first valve body 22, the second valve body 23 and the third valve body 24 are all in a closed state. When sampling is required, the first fan 14 is still in operation, and the plastic particles in the conveying pipe 13 are continuously conveyed. The second motor 5 drives the windshield block 4 to rotate upward, so that the windshield block 4 is located in the conveying pipe 13; the first motor 34 drives the baffle 33 to rotate upward until the baffle 33 rotates to a vertical state, at which time the filter plate 9 is in an inclined state. During the upward rotation of the filter plate 9, the plastic particles attached to or blocked on the filter plate 9 can be shaken off.

[0056] The first valve body 22 and the third valve body 24 are opened, and the second fan 27 is started. The second fan 27 blows air into the sampling tube 21 to transport the vibrated plastic particles to the conveying pipe 13. At the same time, a part of the air in the sampling tube 21 can pass through the filter holes of the filter plate 9 and the ventilation holes 331 of the baffle plate 33 and enter the guide shell 332, and then flow into the air inlet pipe 751, the air inlet portion 81 and the accommodating portion 82 in sequence. The air flowing into the accommodating portion 82 can make the connecting plate 72 rotate, and the connecting plate 72 pushes the knocking block 73 to rotate. When the knocking block 73 is out of contact with the connecting plate 72, the knocking block 73 rotates in the opposite direction to reset, and knocks the connecting column 6, so that the connecting column 6 and the inner wall of the sampling tube 21 vibrate, and the plastic particles attached to the inner wall of the sampling tube 21 are vibrated off, and the vibrated plastic particles are then transported to the conveying pipe 13 by the air blown by the second fan 27.

[0057] After completing the cleaning of the inner wall at the top of the sampling tube 21, the wind shield block 4 rotates downward to the bottom of the avoidance hole 131; the second fan 27 stops running, the third valve body 24 is closed, and the second valve body 23 is opened, and the plastic particles in the conveying pipe 13 can enter the area between the two side plates 32, and then be blocked by the filter plate 9, and the plastic particles fall into the sampling tube 21 again, and the plastic particles in the sampling tube 21 enter the cyclone separator 25 again. The cyclone separator 25 can separate the plastic particles in the airflow, so that the plastic particles fall into the collection box 26 at the bottom of the cyclone separator 25 to collect the samples.

[0058] When the required amount of plastic particles are collected in the collection box 26, the baffle 33 rotates downward to close the end of the sampling tube 21; at this time, most of the plastic particles in the sampling tube 21 fall into the cyclone separator 25. Then close the first valve body 22, open the third valve body 24, start the second fan 27, and the second fan 27 blows air into the sampling tube 21 to blow down the plastic particles attached to the inner wall of the bottom end of the sampling tube 21. The blown plastic particles fall into the cyclone separator 25 and then fall into the collection box 26. Then close the third valve body 24 and the second valve body 23. At this time, the first valve body 22, the second valve body 23 and the third valve body 24 are all in a closed state, and the sampling process is completed. Then, the sample in the collection box 26 is tested to determine whether the produced plastic particles are qualified.

[0059] After the conveying pipe 13 conveys plastic particles for a period of time, when it is necessary to sample the plastic particles again, the wind shield block 4 rotates upward into the conveying pipe 13. The baffle 33 rotates upward to a vertical state, and the filter plate 9 is in an inclined state. During the upward rotation of the filter plate 9, it will separate from the baffle 33, and then the second torsion spring 16 makes the filter plate 9 press against the limit plate 10, so that the filter plate 9 can vibrate and shake off the plastic particles attached to or blocked on the filter plate 9. Then start the second fan 27, and then open the first valve body 22 and the third valve body 24, and the second fan 27 blows air into the sampling tube 21; the wind blown into the sampling tube 21 by the second fan 27 can blow off the plastic particles attached to the inner wall of the top of the sampling tube 21, and then these blown plastic particles and the plastic particles shaken off from the filter plate 9 are sent to the conveying pipe 13, and the airflow flowing out of the sampling tube 21 is converged with the original airflow in the conveying pipe 13, and then continues to be transported along the conveying pipe 13.

[0060] Since the opening 3321 of the guide shell 332 on one side of the baffle plate 33 is aligned with the end of the air inlet pipe 751, a part of the wind blown out by the second fan 27 can flow into the guide shell 332, the air inlet pipe 751, the air inlet portion 81 and the accommodating portion 82 in sequence, so that the connecting plate 72 rotates, and the connecting plate 72 pushes the knocking block 73 to rotate to the side away from the connecting column 6; when the connecting plate 72 is out of contact with the knocking block 73, the first torsion spring 74 causes the knocking block 73 to quickly rotate in the opposite direction to a state of abutting against the connecting column 6, so that the reset knocking block 73 can knock on the connecting column 6, so that the connecting column 6 and the inner wall of the sampling tube 21 vibrate, and the plastic particles attached to the inner wall of the sampling tube 21 are shaken off, and the inner wall of the sampling tube 21 is further cleaned. Therefore, it can be avoided that the plastic particles in the previous sampling are mixed with the plastic particles in the next sampling, which affects the accuracy of sampling.

[0061] After the inner wall of the sampling tube 21 is cleaned, the wind shield block 4 is rotated downward to below the avoidance hole 131, the third valve body 24 is closed, the second valve body 23 is opened, and the plastic particles in the conveying pipe 13 enter the cyclone separator 25 through the sampling tube 21 for re-sampling.

[0062] The above are optional embodiments of the present application, and are not intended to limit the protection scope of the present application. Therefore, any equivalent changes made based on the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. A plastic particle online sampling system, characterized in that: include: A feeding mechanism (1) comprises a buffer hopper (11), a finished product hopper (12), a conveying pipe (13) and a first fan (14); the conveying pipe (13) is connected between the buffer hopper (11) and the finished product hopper (12); an air outlet side of the first fan (14) is in communication with the conveying pipe (13), so that plastic particles in the buffer hopper (11) enter the finished product hopper (12) through the conveying pipe (13); The sampling mechanism (2) comprises a sampling tube (21), a first valve body (22), a second valve body (23), a third valve body (24), a cyclone separator (25), a collecting box (26) and a second fan (27), wherein the sampling tube (21) is connected to the conveying tube (13), the cyclone separator (25) is connected to an end of the sampling tube (21) away from the conveying tube (13), the collecting box (26) is arranged at the discharge end of the cyclone separator (25), the first valve body (22) and the second valve body (23) are both arranged on the sampling tube (21), a branch pipe (271) is arranged on the sampling tube (21) between the first valve body (22) and the second valve body (23), and the third valve body (24) and the second fan (27) are both arranged on the branch pipe (271); The guide mechanism (3) comprises a guide member, a baffle (33) and a first motor (34); the guide member is located in the conveying pipe (13); the guide member comprises a top plate (31) and side plates (32) arranged on both sides of the top plate (31); the side plate (32) is fixedly arranged at one end of the sampling tube (21); the side plate (32) is arranged along the conveying direction of the conveying pipe (13); the baffle (33) is located between the two side plates (32); the baffle (33) is rotatably connected to a side of the side plate (32) away from the first fan (14); the baffle (33) is used to close a gap between the two side plates (32) or an end of the sampling tube (21); the first motor (34) is arranged on the conveying pipe (13); and the output shaft of the first motor (34) is connected to the baffle (33).

2. The online sampling system for plastic particles according to claim 1 is characterized in that: The conveying pipe (13) is provided with a windshield block (4), the windshield block (4) is located on a side of the side plate (32) away from the baffle plate (33), the windshield block (4) is rotatably connected to the conveying pipe (13), and the conveying pipe (13) is provided with a second motor (5) for driving the windshield block (4) to rotate.

3. The online sampling system for plastic particles according to claim 2 is characterized in that: The wind shield block (4) is a fan-shaped block, and an avoidance hole (131) is provided on the inner wall of the delivery pipe (13), and the wind shield block (4) can abut against the inner wall of the avoidance hole (131).

4. The online sampling system for plastic particles according to claim 1 is characterized in that: A connecting column (6) is fixedly arranged in the tube wall of the sampling tube (21), and a knocking mechanism (7) is also arranged in the tube wall of the sampling tube (21). The knocking mechanism (7) comprises a rotating rod (71), a connecting plate (72), a knocking block (73), a first torsion spring (74) and a driving assembly (75). The rotating rod (71) is rotatably connected to the tube wall of the sampling tube (21), the connecting plate (72) is fixedly connected to the rotating rod (71), and the knocking mechanism (7) is driven by the rotating rod (71). The knocking block (73) is rotatably connected to the wall of the sampling tube (21), the first torsion spring (74) is connected between the knocking block (73) and the wall of the sampling tube (21), the first torsion spring (74) makes the knocking block (73) press against the connecting column (6), and the driving assembly (75) is used to drive the rotating rod (71) and the connecting plate (72) to rotate, so that when the connecting plate (72) rotates, it pushes the knocking block (73) to rotate toward a side away from the connecting column (6).

5. The online sampling system for plastic particles according to claim 4 is characterized in that: The driving assembly (75) comprises an air inlet pipe (751) and a filter (752); a receiving groove (8) is provided in a tube wall of the sampling tube (21); the receiving groove (8) comprises an air inlet portion (81), a receiving portion (82) and an air outlet portion (83); the air inlet portion (81) and the air outlet portion (83) are respectively arranged on both sides of the receiving portion (82); the rotating rod (71), the connecting plate (72), the knocking block (73) and the first torsion spring (74) are all arranged in the receiving portion (82); one end of the air inlet pipe (751) is in communication with the air inlet portion (81); the other end of the air inlet pipe (751) is located in the delivery pipe (13); and the filter (752) is arranged at one end of the air inlet pipe (751) located in the delivery pipe (13).

6. The online sampling system for plastic particles according to claim 5, characterized in that: The air inlet pipe (751) is located on a side of the baffle plate (33) away from the first fan (14); a ventilation hole (331) is provided on the baffle plate (33); a guide shell (332) is provided on a side of the baffle plate (33) close to the air inlet pipe (751); and an opening (3321) for communicating with the air inlet pipe (751) is provided on a side of the guide shell (332) away from the baffle plate (33).

7. The online sampling system for plastic particles according to claim 6, characterized in that: A filter plate (9) is arranged on the baffle plate (33).

8. The online sampling system for plastic particles according to claim 7, characterized in that: The filter plate (9) is rotatably connected to the baffle plate (33); an inclined limiting plate (10) is provided on the baffle plate (33); a second torsion spring (16) is connected between the filter plate (9) and the baffle plate (33); the second torsion spring (16) causes the filter plate (9) to abut against the limiting plate (10); a first support rod (321) and a second support rod (322) for abutting against the filter plate (9) are provided on the side plate (32); the first support rod (321) is used to drive the filter plate (9) to rotate toward a side close to the baffle plate (33); the second support rod (322) is used to drive the filter plate (9) to rotate toward a side away from the baffle plate (33); a connecting assembly (17) is provided between the baffle plate (33) and the filter plate (9); the connecting assembly (17) is used to temporarily connect the filter plate (9) and the baffle plate (33) together.

9. The online sampling system for plastic particles according to claim 8, characterized in that: The connecting assembly (17) comprises a first magnet block (171) and a second magnet block (172), wherein the first magnet block (171) is fixedly connected to the filter plate (9), and the second magnet block (172) is fixedly connected to the baffle plate (33), and the magnetic poles of the first magnet block (171) and the second magnet block (172) on a side close to each other have opposite directions.

10. The online sampling system for plastic particles according to claim 9, characterized in that: A flexible bag body is connected between the filter plate (9) and the baffle plate (33).

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