A plastic particle online sampling system

Abstract

The present application relates to the technical field of plastic particle production, and specifically discloses a plastic particle online sampling system, which includes a feeding mechanism, including a buffer hopper, a finished product hopper, a conveying pipe and a first fan; a sampling mechanism, including 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, wherein the sampling pipe is connected to the conveying pipe, the cyclone separator is connected to one end of the sampling pipe away from the conveying pipe, 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 pipe, a branch pipe is arranged on the sampling pipe 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; a guiding mechanism, including a guiding member, a baffle and a first motor. The present application can clean the inner wall of the sampling pipe to prevent the plastic particles in the previous sampling from being taken out during the next sampling process, which helps to ensure the accuracy of sampling.

Description

Technical Field

[0001] The present application relates to the technical field of plastic particle production, and particularly to an on-line sampling system for plastic particles. Background Art

[0002] During the production of plastic particles by a granulator, defective products may be produced due to unqualified raw materials or incorporated impurities. Therefore, after the production of plastic particles is completed, sampling and testing are required to determine whether the produced plastic particles meet the requirements.

[0003] Generally, when testing plastic particles, a sampling pipe is provided on the conveying pipe of the plastic particles, and a valve body is provided on the sampling pipe. When sampling is required, the valve body is opened to allow a part of the plastic particles in the conveying pipe to be discharged through the sampling pipe, and the valve body is closed after sampling is completed, thereby realizing on-line sampling.

[0004] Due to the adsorption effect of static electricity, after a sampling is completed, some plastic particles will adhere to the inner wall of the sampling pipe. When production has been carried out for a period of time and sampling needs to be carried out again, when the valve body is opened again for sampling, the plastic particles during the previous sampling process adhering to the inner wall of the pipe will be mixed with the plastic particles during the current sampling process, resulting in cross-contamination between samples and affecting the accuracy of the current sampling. Summary of the Invention

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

[0006] The on-line sampling system for plastic particles provided by the present application adopts the following technical solutions:

[0007] An on-line sampling system for plastic particles, comprising:

[0008] A feeding mechanism, including a buffer hopper, a finished product hopper, a conveying pipe, and a first blower. The conveying pipe is connected between the buffer hopper and the finished product hopper, and the air outlet side of the first blower is communicated with the conveying pipe so that the plastic particles in the buffer hopper enter the finished product hopper through the conveying pipe;

[0009] A sampling mechanism, including a sampling pipe, a first valve body, a second valve body, a third valve body, a cyclone separator, a collection box, and a second blower. The sampling pipe is connected to the conveying pipe, the cyclone separator is connected to the end of the sampling pipe far from the conveying pipe, the collection 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 pipe, a branch pipe is arranged on the sampling pipe between the first valve body and the second valve body, and the third valve body and the second blower are both arranged on the branch pipe;

[0010] The guiding mechanism includes a guiding member, a baffle, and a first motor. The guiding member is located in the conveying pipe. The guiding member includes a top plate and side plates arranged on both sides of the top plate. The side plates are fixedly arranged at one end of the sampling pipe. The side plates are 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 pipe. The first motor is arranged on the conveying pipe, and the output shaft of the first motor is connected to the baffle.

[0011] 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. The cyclone separator can separate the plastic particles in the air flow and discharge the plastic particles into the collection box, thereby realizing on-line sampling, that is, the sampling process does not affect the conveying of the plastic particles in the conveying pipe, which helps to ensure the conveying 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. The blown-off plastic particles can enter the cyclone separator along with the air flow, thereby cleaning the inner wall of the sampling pipe; 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 pipe to blow off the plastic particles attached to the inner wall of the upper end of the sampling pipe. 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 pipe to remove the plastic particles attached to the inner wall of the sampling pipe, thereby avoiding the plastic particles attached to the inner wall of the sampling pipe in the previous sampling from being taken out in the next sampling, thus ensuring the accuracy of sampling;

[0012] During the sampling process, the baffle is vertically arranged, and the baffle closes the gap between the two side plates. Therefore, the enclosure structure composed of the top plate, the side plates, and the baffle can guide a part of the air flow, so that the air flow flowing into the interior of this enclosure area can flow into the sampling pipe 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 end of the sampling pipe. Therefore, after the inner wall of the sampling pipe is cleaned, the baffle can close the top end of the sampling pipe, so that the plastic particles in the conveying pipe are not easily introduced into the sampling pipe. When sampling next time, the baffle is opened for sampling, and the accuracy of sampling can be ensured; 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.

[0013] Optionally, a wind-blocking block is arranged on the conveying pipe. The wind-blocking block is located on the side of the side plate away from the baffle. The wind-blocking block is rotatably connected in the conveying pipe. A second motor for driving the wind-blocking block to rotate is arranged on the conveying pipe.

[0014] By adopting the above technical solution, the wind blocking 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 flows out from the gap between the wind blocking block and the side plate and can converge with the wind blown by the first fan in the conveying pipe. The converged wind is then continuously conveyed, thus ensuring the conveying effect; and preventing the wind blown by the second fan from flowing out through the sampling pipe and flowing in the opposite direction to the wind blown by the first fan in the conveying pipe, which may affect the conveying of plastic particles.

[0015] Optionally, the wind blocking block is a sector block, and an avoidance hole is provided on the inner wall of the conveying pipe, and the wind blocking block can abut against the inner wall of the avoidance hole.

[0016] By adopting the above technical solution, the side wall of the wind blocking block abuts against the inner wall of the avoidance hole, so the plastic particles in the conveying pipe are not easily leaked out through the avoidance hole; compared with a plate-like structure, the sector shape makes it not easy for plastic particles to accumulate under the wind blocking block, thus ensuring the smooth rotation of the wind blocking block.

[0017] Optionally, a connecting column is fixedly arranged in the pipe wall of the sampling pipe, and a knocking mechanism is also arranged in the pipe wall of the sampling pipe. The knocking mechanism includes a rotating rod, a connecting plate, a knocking block, a first torsion spring and a driving component. The rotating rod is rotatably connected in the pipe wall of the sampling pipe, the connecting plate is fixedly connected to the rotating rod, the knocking block is rotatably connected in the pipe wall of the sampling pipe, the first torsion spring is connected between the knocking block and the pipe wall of the sampling pipe, the first torsion spring makes the knocking block abut tightly against the connecting column, and the driving component is used to drive the rotating rod and the connecting plate to rotate, so that when the connecting plate rotates, it pushes the knocking block to rotate to the side away from the connecting column.

[0018] By adopting the above technical solution, the driving component drives the rotating rod and the connecting plate to rotate. The connecting plate can push the knocking block to rotate to the side away from the connecting column. When the connecting plate disengages from the knocking block, the first torsion spring can make the knocking block rotate reversely to reset, so that the knocking block knocks on the connecting column, causing the connecting column and the inner wall of the sampling pipe to vibrate, and vibrating the plastic particles attached to the inner wall of the sampling pipe, thus preventing the plastic particles attached to the inner wall of the sampling pipe from entering the next sampling, which helps to ensure the accuracy of sampling.

[0019] Optionally, the driving component includes an air inlet pipe and a filter screen. A receiving groove is formed in the pipe wall of the sampling pipe. The receiving groove includes an air inlet part, a receiving part and an air outlet part. The air inlet part and the air outlet part are respectively arranged on both sides of the receiving part. The rotating rod, the connecting plate, the knocking block and the first torsion spring are all arranged in the receiving part. One end of the air inlet pipe is communicated with the air inlet part, the other end of the air inlet pipe is located in the conveying pipe, and the filter screen is arranged at the end of the air inlet pipe located in the conveying pipe.

[0020] By adopting the above technical solution, the air in the conveying pipe can flow into the air inlet pipe, the air inlet part and the accommodating part in sequence. The air entering the accommodating part can cause the connecting plate to rotate. Therefore, no additional power source is required for the rotation of the connecting plate and the rotating rod, which is more energy-saving.

[0021] Optionally, the air inlet pipe is located on the side of the baffle away from the first fan. Ventilation holes are provided on the baffle. A guiding shell is provided on the side of the baffle close to the air inlet pipe. An opening for communicating with the air inlet pipe is provided on the side of the guiding shell away from the baffle.

[0022] By adopting the above technical solution, part of the air blown out by the second fan can flow out into the conveying pipe to convey the residual plastic particles in the sampling pipe into the conveying pipe, and the other part can flow into the guiding shell, the air inlet pipe, the air inlet part and the accommodating part in sequence, thereby increasing the air inflow 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 pipe, and thus enhancing the cleaning effect.

[0023] Optionally, a filter plate is provided on the baffle.

[0024] 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 blockage of the ventilation holes on the baffle.

[0025] Optionally, the filter plate is rotatably connected to the baffle. An inclined limiting plate is provided on the baffle. A second torsion spring is connected between the filter plate and the baffle. The second torsion spring makes the filter plate abut against the limiting plate. A first support rod and a second support rod for abutting against the filter plate are provided on the side plate. The first support rod is used to drive the filter plate to rotate towards the side close to the baffle, and the second support rod is used to drive the filter plate to rotate away from the baffle. A connecting component is provided between the baffle and the filter plate, and the connecting component is used to temporarily connect the filter plate and the baffle together.

[0026] 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. The filter plate abuts against the second support rod, so that the filter plate can rotate away from the baffle relative to the baffle. At this time, the connection of the connecting component is disconnected. Therefore, the second torsion spring can make the filter plate quickly rotate in the reverse direction and reset, and make the filter plate abut against the limiting plate. Therefore, when the filter plate abuts against the limiting plate during the reset process, vibration can be generated, so as to vibrate 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 smoothness of the filter plate, so that air can pass through the filter plate smoothly. On the other hand, it can reduce the cross between the samples in two samplings, which helps to ensure the accuracy of sampling.

[0027] Optionally, the connecting component includes a first magnet block and a second magnet block. The first magnet block is fixedly connected to the filter plate, and the second magnet block is fixedly connected to the baffle. The magnetic pole directions of the mutually approaching sides of the first magnet block and the second magnet block are opposite.

[0028] 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 the temporary connection of the filter plate and the baffle.

[0029] Optionally, a flexible bag body is connected between the filter plate and the baffle.

[0030] By adopting the above technical solution, the bag body can enclose the area between the filter plate and the baffle, thereby preventing plastic particles from being blown into this area during the blowing of the second blower, so that the plastic particles in the sampling tube can all be transported to the conveying pipe by the wind blown by the second blower, thus ensuring the accuracy of sampling.

[0031] In summary, the present application includes the following beneficial technical effects:

[0032] 1. The second blower can blow air into the sampling tube, blow off the plastic particles adhering 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, which helps to ensure the accuracy of sampling.

[0033] 2. The enclosure structure composed of the top plate, the side plate and the baffle can guide the airflow in the conveying pipe, so that the airflow in the conveying pipe can more easily enter the sampling tube through the enclosure area, which helps to ensure the sampling efficiency.

[0034] 3. The air blown by the second blower can also flow into the guiding shell, the air inlet pipe, the air inlet part and the accommodating part in sequence, so that the connecting plate rotates. The connecting plate makes the knocking block rotate, so that the knocking block knocks on the connecting column, causing the inner wall of the sampling tube to vibrate, which helps to enhance the cleaning effect on the inner wall of the sampling tube, thus ensuring the accuracy of sampling. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] Figure 1 is the overall structural schematic diagram of the embodiment of the present application;

[0036] Figure 2 is the cross-sectional view of the embodiment of the present application;

[0037] Figure 3 is Figure 2 the enlarged schematic diagram of part A in

[0038] Figure 4 is the cross-sectional view after the wind-blocking block rotates upward in the embodiment of the present application;

[0039] Figure 5 is a cross-sectional view of the percussion mechanism shown in the embodiments of the present application;

[0040] Figure 6 is Figure 5 an enlarged schematic view of position B in

[0041] Figure 7 is a schematic structural view of the filter plate and the baffle shown in the embodiments of the present application;

[0042] Figure 8 is a schematic structural view of the positions of the first support rod and the second support rod shown in the embodiments of the present application;

[0043] Figure 9 is a cross-sectional view after the baffle rotates downward in the embodiments of the present application;

[0044] Figure 10 is Figure 9 an enlarged schematic view of position C in

[0045] 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 pipe; 22, first valve body; 23, second valve body; 24, third valve body; 25, cyclone separator; 26, collection box; 27, second fan; 271, branch pipe; 3, guiding mechanism; 31, top plate; 32, side plate; 321, first support rod; 322, second support rod; 33, baffle; 331, ventilation hole; 332, guiding shell; 3321, opening; 333, notch; 34, first motor; 4, wind blocking block; 5, second motor; 6, connecting column; 7, percussion mechanism; 71, rotating rod; 72, connecting plate; 73, percussion block; 74, first torsion spring; 75, driving assembly; 751, air inlet pipe; 752, filter screen; 8, accommodating groove; 81, air inlet part; 82, accommodating 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 implementation manners

[0046] The following Figures 1 - 10 further describes the present application in detail.

[0047] The embodiments of the present application disclose an on-line sampling system for plastic particles. Refer to Figure 1 and Figure 2, the on-line plastic particle sampling system includes a feeding mechanism 1, and the feeding mechanism 1 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 communicated with the buffer hopper 11 and the finished product hopper 12. 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 metering 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 100 KPa, so that the plastic particles in the conveying pipe 13 move to the finished product hopper 12 to complete the conveying of the plastic particles.

[0048] Refer to Figure 2 , a sampling mechanism 2 is arranged on one side of the conveying pipe 13. 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 collection 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 end of the sampling pipe 21 is communicated with the inside of the conveying pipe 13. The cyclone separator 25 is arranged on one side of the sampling pipe 21, and the feeding end of the cyclone separator 25 is communicated with the bottom end of the sampling pipe 21. The collection box 26 is located below the cyclone separator 25, and the discharge end of the cyclone separator 25 faces the collection 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 relatively heavy weight until they are discharged from the bottom discharge end into the collection box 26. Therefore, the cyclone separator 25 can separate the plastic particles doped in the gas, thus completing the sampling process.

[0049] Both the first valve body 22 and the second valve body 23 are fixedly connected to the sampling pipe 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. A branch pipe 271 is also fixedly connected to the sampling pipe 21. The branch pipe 271 is communicated with the sampling pipe 21, and the branch pipe 271 is located between the first valve body 22 and the second valve body 23. The second fan 27 is fixedly connected to the end of the branch pipe 271 away from the sampling pipe 21, and the air outlet side of the second fan 27 is located inside the branch pipe 271; a 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. Any valve body that can control the opening and closing of the pipeline can be used.

[0050] 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 the closed state. When sampling is required, the first valve body 22 and the second valve body 23 are opened. At this time, the plastic particles in the conveying pipe 13 can enter the cyclone separator 25 through the sampling pipe 21, so as to conduct 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 pipe 21, and the conveying pressure is 600 KPa. Therefore, the plastic particles attached to the inner wall of the bottom end of the sampling pipe 21 can be blown off, and these plastic particles can enter the cyclone separator 25. Then the second valve body 23 and the third valve body 24 are closed. At this time, the first valve body 22, the second valve body 23, and the third valve body 24 are all in the closed state, and the sampling process is completed.

[0051] When re-sampling is required, 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 pipe 21 to convey the plastic particles inside the top end of the sampling pipe 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 pipe 21 and the cyclone separator 25, so as to conduct sampling. Therefore, the second fan 27 can empty the plastic particles attached to the inner wall of the sampling pipe 21, thereby reducing the impact of the plastic particles left during the previous sampling on the subsequent sampling process, which helps to ensure the accuracy of sampling.

[0052] Among them, the wind pressure generated by the second fan 27 is greater than the wind pressure generated by the first fan 14. Therefore, when the first valve body 22 and the third valve body 24 are opened and the second fan 27 blows air into the sampling pipe 21, the plastic particles in the sampling pipe 21 are blown into the conveying pipe 13, and the plastic particles in the conveying pipe 13 cannot flow into the sampling pipe 21, thus ensuring the one-way flow of the plastic particles in the sampling pipe 21, which helps to ensure the cleaning effect of the residual plastic particles in the sampling pipe 21, and thus ensures the accuracy of sampling.

[0053] Refer to Figure 1 and Figure 3, a guiding mechanism 3 is further provided in the conveying pipe 13. The guiding mechanism 3 includes a guiding member, a baffle 33 and a first motor 34. The guiding member is located above the sampling pipe 21. The guiding member includes a top plate 31 and side plates 32. The side plates 32 are arranged along the conveying direction of the conveying pipe 13. There are two side plates 32 arranged in parallel at intervals. The top ends of the side plates 32 are fixedly connected to the top plate 31, and the bottom ends of the side plates 32 are fixedly connected to the top wall of the sampling pipe 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 ends of the two side plates 32 away from the first blower 14. At this time, the top plate 31, the two side plates 32 and the baffle 33 can block the air flow in the conveying pipe 13. A part of the air flow mixed with plastic particles can directly flow into the area between the two side plates 32 and then into the sampling pipe 21, which helps to sample better. When the baffle 33 is in a horizontal state, the baffle 33 can close the top end of the sampling pipe 21. At this time, the plastic particles can be conveyed, and the plastic particles are not easy to enter the sampling pipe 21. The first motor 34 is fixedly connected to the conveying pipe 13. The output shaft of the first motor 34 is arranged horizontally, and the output shaft of the first motor 34 is fixedly connected to the baffle 33. Therefore, the first motor 34 can drive the baffle 33 to rotate.

[0054] Among them, the output shaft of the first motor 34 can be self-locked. Therefore, after the baffle 33 stops rotating, the baffle 33 can stay in the current position, which helps to ensure the stability of the baffle 33.

[0055] Referring to Figure 3 and Figure 4 , further, a wind-blocking block 4 is further provided in the conveying pipe 13. The cross-section of the wind-blocking block 4 is fan-shaped. The wind-blocking block 4 is located on the side of the side plate 32 away from the baffle 33. The wind-blocking block 4 is hinged to the inner wall of the conveying pipe 13, and the hinge axis of the wind-blocking block 4 is coaxial with its own axis. Correspondingly, an avoidance hole 131 is provided at the bottom of the conveying pipe 13. The avoidance hole 131 can abut against the side wall of the wind-blocking block 4. Therefore, 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 wind-blocking block 4. A second motor 5 is fixedly connected to the conveying pipe 13. The output shaft of the second motor 5 is arranged horizontally, and the output shaft of the second motor 5 is fixedly connected to the wind-blocking block 4. Therefore, the second motor 5 can drive the wind-blocking block 4 to rotate. When the wind-blocking block 4 is located above the avoidance hole 131, the wind-blocking block 4 can block the air flow flowing out of the sampling pipe 21, thereby changing the air flow direction so that the air flow flowing out of the sampling pipe 21 can converge with the original air flow in the conveying pipe 13. When the wind-blocking block 4 is located below the avoidance hole 131, the shielding area of the wind-blocking block 4 can be reduced, so that the air flow in the conveying pipe 13 can flow smoothly.

[0056] Among them, the output shaft of the second motor 5 can be self-locked. Therefore, after the windshield block 4 stops rotating, the windshield block 4 can stay at the current position, which helps to ensure the stability of the windshield block 4.

[0057] Referring to Figure 5 and Figure 6 , a receiving groove 8 is provided in the inner wall of the sampling tube 21. A connecting column 6 is fixedly connected in the receiving groove 8. The axis of the connecting column 6 is arranged along the width direction of the conveying tube 13. There are a plurality of connecting columns 6 and they are arranged in a circumferential array. A knocking mechanism 7 is also provided in the receiving groove 8. The knocking mechanism 7 can knock the connecting column 6, causing the connecting column 6 to vibrate, so that the inner wall of the sampling tube 21 vibrates, and the plastic particles attached to the inner wall of the sampling tube 21 are shaken off, thereby enhancing the cleaning effect on the inner wall of the sampling tube 21.

[0058] Referring to 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 receiving groove 8 includes an air inlet part 81, a receiving part 82 and an air outlet part 83. The air inlet part 81 and the air outlet part 83 are respectively arranged on both sides of the receiving part 82, and both the air inlet part 81 and the air outlet part 83 communicate with the receiving part 82. The rotating rod 71 is arranged along the width direction of the conveying tube 13, and the rotating rod 71 is rotatably connected to the inner wall of the receiving part 82. The connecting plate 72 is fixedly connected to the side wall of the rotating rod 71. There are a plurality of connecting plates 72 and they are arranged in a circumferential array. There are a plurality of knocking blocks 73. The number of knocking blocks 73 is the same as the number of connecting columns 6. Each knocking block 73 corresponds to a connecting column 6; the knocking block 73 is hinged to the inner wall of the receiving part 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 receiving part 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.

[0059] Referring to 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 communicates with 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 abuts against the knocking block 73. Then, as the connecting plate 72 rotates, 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 disengages from the knocking block 73, the first torsion spring 74 can cause the knocking block 73 to rotate in the reverse 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 pipe 21 to vibrate. The filter screen 752 is fixedly connected to one end of the air inlet pipe 751 located in the conveying pipe 13. The aperture of the filter screen 752 is smaller than the particle size of the plastic particles. Therefore, the plastic particles cannot enter the air inlet pipe 751, so that the accommodating groove 8 inside the sampling pipe 21 is not easily blocked, which helps the smooth flow of the airflow.

[0060] 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 ventilation holes 331. There are multiple ventilation holes 331, and the aperture of the ventilation holes 331 is smaller than the particle size of the plastic particles. A guiding shell 332 is fixedly connected to the side of the baffle 33 close to the air inlet pipe 751. The guiding shell 332 is arranged in a conical shape, and an opening 3321 is provided on the side of the guiding shell 332 away from the baffle 33. When the baffle 33 is in a vertical state, the opening 3321 on the guiding shell 332 abuts against the end of the air inlet pipe 751, so that the inside of the guiding shell 332 is communicated with the air inlet pipe 751. Therefore, during the sampling process, the plastic particles mixed in the airflow entering between the two side plates 32 can be blocked by the baffle 33, and the plastic particles fall into the sampling pipe 21; while a part of the airflow can flow into the guiding shell 332 through the ventilation holes 331, and then the airflow in the guiding shell 332 can flow into the air inlet pipe 751, the air inlet portion 81 and the accommodating portion 82 in sequence, thereby increasing the air flow rate flowing into the accommodating portion 82, increasing the thrust of the airflow on the connecting plate 72, 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 pipe 21.

[0061] Refer to Figure 3 , in order to reduce the possibility of blockage of the ventilation holes 331 on the baffle 33, a filter plate 9 is provided on the side of the baffle 33 away from the guiding 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 pipe 21.

[0062] Refer to Figure 7and Figure 8 The top end of the filter plate 9 is hinged to the baffle 33, and the hinge axes of the filter plate 9 and the baffle 33 are parallel. A limiting plate 10 is fixedly connected to the top end of the baffle 33, and a second torsion spring 16 is fixedly connected between the filter plate 9 and the baffle 33. In the normal state, the second torsion spring 16 is in a twisted state, so that the filter plate 9 abuts against the limiting plate 10, and at this time, the filter plate 9 is arranged obliquely.

[0063] Refer to Figure 8 、 Figure 9 and Figure 10 A connecting component 17 is arranged between the filter plate 9 and the baffle 33. The connecting component 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 pole directions of the mutually approaching sides of the first magnet block 171 and the second magnet block 172 are opposite, so that 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, both the filter plate 9 and the baffle 33 are in a horizontal state, and at this time, the second torsion spring 16 is further twisted.

[0064] Refer to Figure 4 、 Figure 7 and Figure 8 A first support rod 321 and a second support rod 322 for abutting against the filter plate 9 are fixedly connected to the side plate 32. 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. During sampling, the baffle 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 33 and the filter plate 9, and the filter plate 9 abuts against the limiting plate 10 under the action of the second torsion spring 16. After 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 which time the first magnet block 171 and the second magnet block 172 are attracted to each other, and the filter plate 9 is temporarily fixedly connected to the baffle 33.

[0065] When re-sampling is required, the horizontal baffle 33 rotates upward, and the baffle 33 drives the filter plate 9 to rotate together. During the rotation of the filter plate 9, it will abut against the second rod 322, and then the second rod 322 restricts 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 causes the filter plate 9 to rotate quickly and reset until the filter plate 9 abuts tightly against the limit plate 10. Therefore, during the process that the filter plate 9 rotates reversely and abuts tightly against the limit plate 10, the filter plate 9 can generate vibration, so as to vibrate off the plastic particles attached or blocked on the filter plate 9 and clean the surface of the filter plate 9.

[0066] Wherein, a notch 333 for the second rod 322 to pass through is formed on the baffle 33. Therefore, during the rotation of the baffle 33, the second rod 322 will not interfere with the baffle 33, and the baffle 33 can rotate smoothly.

[0067] In addition, a flexible bag body (not shown in the figure) is also arranged between the filter plate 9 and the baffle 33. The bag body closes the area between the filter plate 9 and the baffle 33. Therefore, during the process that the second blower 27 blows air into the sampling pipe 21, the plastic particles moving upward along with the air flow are not easy to enter the area between the filter plate 9 and the baffle 33. Therefore, all the plastic particles in the sampling pipe 21 can be conveyed into the conveying pipe 13, thereby weakening the influence of this part of plastic particles on the subsequent sampling process.

[0068] The second blower 27 can also be set as an anion blower, so as to enhance the anti-static effect on the plastic particles, make the plastic particles not easy to adhere to the inner wall of the sampling pipe 21, and help to enhance the cleaning effect on the inner wall of the sampling pipe 21.

[0069] The implementation principle of the plastic particle on-line sampling system in the embodiment of the present application is as follows: the produced 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 blower 14 is in a working state, and the first blower 14 blows air into the conveying pipe 13. Therefore, the plastic particles in the conveying pipe 13 can be driven to move, and the plastic particles can move through the conveying pipe 13 to the finished product hopper 12.

[0070] In the initial state, the baffle 33 is in a horizontal state, the filter plate 9 is parallel to the baffle 33, the wind-blocking 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 blower 14 is still in a working state, and the plastic particles in the conveying pipe 13 continue to be conveyed. The second motor 5 drives the wind-blocking block 4 to rotate upward so that the wind-blocking 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, and at this 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.

[0071] Open the first valve body 22 and the third valve body 24, start the second blower 27, and the second blower 27 blows air into the sampling pipe 21 to convey the shaken-off plastic particles into the conveying pipe 13. At the same time, a part of the air in the sampling pipe 21 can pass through the filter holes of the filter plate 9 and the ventilation holes 331 of the baffle 33 and then enter the guide housing 332, and then flow into the air inlet pipe 751, the air inlet part 81 and the accommodating part 82 in sequence. The air flowing into the accommodating part 82 can cause the connecting plate 72 to rotate, and the connecting plate 72 pushes the knocking block 73 to rotate. When the knocking block 73 breaks away from the contact with the connecting plate 72, the knocking block 73 rotates reversely to reset and knocks on the connecting column 6, causing the connecting column 6 and the inner wall of the sampling pipe 21 to vibrate, shaking off the plastic particles attached to the inner wall of the sampling pipe 21, and the shaken-off plastic particles are then conveyed into the conveying pipe 13 by the air blown by the second blower 27.

[0072] After cleaning the inner wall of the top end of the sampling pipe 21, the wind-blocking block 4 rotates downward to below the avoidance hole 131; the second blower 27 stops operating, the third valve body 24 is closed, 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 are blocked by the filter plate 9. The plastic particles then fall into the sampling pipe 21, and the plastic particles in the sampling pipe 21 then enter the cyclone separator 25. The cyclone separator 25 can separate the plastic particles in the air flow, causing the plastic particles to fall into the collection box 26 at the bottom of the cyclone separator 25 to collect the sample.

[0073] When the required amount of plastic particles is 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 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 blows air into the sampling tube 21 to blow off the plastic particles adhering to the inner wall of the bottom end of the sampling tube 21. The blown-off plastic particles fall into the cyclone separator 25 and then into the collection box 26. Then the third valve body 24 and the second valve body 23 are closed. At this time, the first valve body 22, the second valve body 23, and the third valve body 24 are all in the closed state, and the sampling process is completed. Then the sample in the collection box 26 is detected to determine whether the produced plastic particles are qualified.

[0074] After the conveying pipe 13 conveys plastic particles for a period of time and it is necessary to sample the plastic particles again, the wind blocking block 4 rotates upward into the conveying pipe 13. The baffle 33 rotates upward to the vertical state. At this time, 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 abut against the limiting plate 10. Therefore, the filter plate 9 can vibrate to shake off the plastic particles adhering to or blocking the filter plate 9. Then the second fan 27 is started, and then the first valve body 22 and the third valve body 24 are opened. The second fan 27 blows air into the sampling tube 21; the air blown into the sampling tube 21 by the second fan 27 can blow off the plastic particles adhering to the inner wall of the top end of the sampling tube 21, and then send the blown-off plastic particles and the plastic particles shaken off from the filter plate 9 into the conveying pipe 13. The air flow flowing out of the sampling tube 21 converges with the original air flow in the conveying pipe 13 and then continues to be conveyed along the conveying pipe 13.

[0075] Since the opening 3321 of the guide shell 332 on one side of the baffle 33 is aligned with the end of the air inlet pipe 751 at this time, a part of the air blown by the second fan 27 can flow into the guide shell 332, the air inlet pipe 751, the air inlet part 81, and the accommodating part 82 in sequence, causing the connecting plate 72 to rotate. The connecting plate 72 pushes the knocking block 73 to rotate away from the connecting column 6; when the connecting plate 72 disengages from the knocking block 73, the first torsion spring 74 makes the knocking block 73 quickly rotate in the reverse direction to the state of abutting against the connecting column 6. Therefore, the reset knocking block 73 can knock on the connecting column 6, causing the connecting column 6 and the inner wall of the sampling tube 21 to vibrate, shaking off the plastic particles adhering to the inner wall of the sampling tube 21 and further cleaning the inner wall of the sampling tube 21. Thus, it is possible to prevent the plastic particles in the previous sampling from being mixed with the plastic particles in the subsequent sampling, affecting the accuracy of sampling.

[0076] After the inner wall of the sampling pipe 21 is cleaned, the wind shield 4 rotates downward to the lower part of the avoidance hole 131. The third valve body 24 is closed and the second valve body 23 is opened. The plastic particles in the conveying pipe 13 enter the cyclone separator 25 through the sampling pipe 21 for re-sampling.

[0077] The above are optional embodiments of the present application, which do not limit the protection scope of the present application. Therefore, all equivalent changes made according to the structure, shape and principle of the present application shall be covered within 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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