An automatic sampling device for an oily sewage treatment system

Abstract

The present invention relates to the technical field of sewage sampling, and specifically relates to an automatic sampling device for an oily sewage treatment system, which includes a cleaning unit for cleaning a container; the cleaning unit includes a lifting shell that moves in the vertical direction, a follower shell is rotatably arranged at the lower part of the lifting shell, a trigger block is horizontally moved at the lower part of the follower shell, when the trigger block extends out, it can contact the inner wall of the container and the pressure of the trigger block on the inner wall of the container is constant, a torsion monitoring unit is arranged between the follower shell and the lifting shell, when detecting the cleanliness of the inner wall of the container, the lifting shell drives the follower shell to rotate through the torsion monitoring unit, and the torsion monitoring unit is used to monitor the friction force between the trigger block and the inner wall of the container. The present invention makes the standard for detecting the cleanliness of the container unified, avoids the subjectivity existing in the artificial detection of the cleanliness of the inner wall of the container, and realizes the accurate detection of the cleanliness inside the container.

Description

Technical Field

[0001] The present invention relates to the technical field of sewage sampling, and specifically relates to an automatic sampling device for an oily sewage treatment system. Background Art

[0002] During the process of sampling oily sewage, it is necessary to manually connect a rope to throw a sampling cup into the oily sewage pool for collecting the oily sewage, and then slowly pull up the collected sewage for collection. This is not only time-consuming and laborious, but also when pulling up the sampling cup, a large amount of the sample sewage is likely to splash out, resulting in the need for secondary sampling, which is quite troublesome.

[0003] Chinese Patent Publication No. CN218956155U discloses an automatic sampling device for an oil and gas field sewage treatment system, including an installation frame and a sampling mechanism. The installation frame is installed on the upper cover of an external oily sewage pool, and a controller is installed at the upper end of the installation frame, which is electrically connected to an external power supply. A mounting frame is connected through the middle of the upper end of the installation frame, and a guide wheel is movably connected in the middle of the mounting frame. A through hole is formed through the bottom of the installation frame, and on one side of the through hole, a wire reel is installed at the inner bottom of the installation frame. A winding shaft is movably connected to the middle of the wire reel, and a steel wire rope is wound around the winding shaft. A stepping motor is installed at the side end of the wire reel, and the rotating shaft of the stepping motor penetrates through the wire reel and is connected to the winding shaft. One end of three connecting ropes is connected to the upper part of the sampling mechanism, and the other ends of the three connecting ropes are wound together. The steel wire rope passes through the guide wheel downward and passes through the through hole to be connected to the three connecting ropes wound together.

[0004] The above solution realizes the automatic collection of oily sewage. However, after each collection is completed, since there is oil floating on the upper layer of the sewage, after the container for containing the sewage comes into contact with the oil, oil will adhere to both the inside and outside of the container. To ensure the accuracy of the experiment, before the secondary collection, the container needs to be cleaned. However, it is difficult to clean the container wrapped with oil. The traditional cleaning method is mostly manual cleaning, and the cleaning condition of the container needs to be determined by manual observation. And the subjective judgment of whether the container is cleaned cleanly by humans is likely to have a great impact on the subsequent detection results. Although the existing automatic collection device is equipped with a cleaning unit for cleaning the container, due to the particularity of the oily sewage, after the cleaning is completed, there is a situation where some oil adheres to the container. If the color of the oil is transparent, the existing sensors cannot correctly detect the oil adhered to the container. Summary of the Invention

[0005] To address the above problems, an automatic sampling device for an oil-containing sewage treatment system is provided. By setting a lifting shell and a follower shell, and arranging a torsion monitoring unit between the lifting shell and the follower shell, when the cleaning unit detects the inner wall of the container, the lifting shell drives the follower shell to rotate through the torsion monitoring unit. The follower shell drives the trigger block to rotate synchronously. The trigger block is in sliding fit with the inner wall of the container. While driving the follower shell to rotate, the lifting shell also drives the follower shell to rise vertically, causing the trigger block to gradually rise in a spiral shape. In this way, the trigger block can completely sweep the inner wall of the container. At the same time, a preset threshold range is set for the torsion monitoring unit. When the container is cleaned, if there is no oil stain in the container, during the process of the trigger block contacting the inner wall of the container, the value monitored by the torsion monitoring unit is always within the threshold range. If there is an oil stain on the inner wall of the container, when the trigger block passes through the oil stain position, the friction coefficient between the trigger block and the inner wall of the container is greatly reduced. At this time, the torsion monitored by the torsion monitoring unit will suddenly drop, and the torsion is lower than the threshold range. If this is the case, it indicates that the container is not cleaned cleanly and needs to be cleaned again. The present invention makes the standard for detecting the cleanliness of the container unified, avoids the subjectivity existing in the manual detection of the cleanliness of the inner wall of the container, and realizes the accurate detection of the cleanliness inside the container.

[0006] To solve the problems of the prior art, the present invention provides an automatic sampling device for an oil-containing sewage treatment system, including a cleaning unit for cleaning the container; the cleaning unit includes a lifting shell that moves vertically. A follower shell is rotatably arranged at the lower part of the lifting shell. A trigger block is horizontally moved at the lower part of the follower shell. When the trigger block extends, it can contact the inner wall of the container and the pressure of the trigger block on the inner wall of the container is constant. A torsion monitoring unit is arranged between the follower shell and the lifting shell. When detecting the cleanliness of the inner wall of the container, the lifting shell drives the follower shell to rotate through the torsion monitoring unit. The torsion monitoring unit is used to monitor the friction force between the trigger block and the inner wall of the container.

[0007] Preferably, a first extension part is arranged at the lower part of the lifting shell, a second extension part is arranged at the upper part of the follower shell, a first spring is arranged between the first extension part and the second extension part, and a pressure sensor for detecting the elastic force of the first spring is arranged at any end of the first spring.

[0008] Preferably, the cleaning unit further includes a cleaning shell sleeved outside the lifting shell and capable of driving the lifting shell to rotate. A sealing area and a detection area are arranged vertically in the cleaning shell. When the trigger block that rises and falls synchronously with the lifting shell is located in the sealing area, the trigger block is isolated from the outside. When the trigger block is located in the detection area, the trigger block can extend from the follower shell and contact the inner wall of the container.

[0009] Preferably, a sector-shaped groove for the trigger block to pass through is formed in the side wall of the cleaning shell, and the sector-shaped groove constitutes a detection area. A sealing disc with the same diameter as the inner ring diameter of the cleaning shell is fixedly arranged at the bottom of the follower shell. When the sealing disc is located above the sector-shaped groove, a sealing area is formed between the sealing disc and the cleaning shell.

[0010] Preferably, a water injection pipe is vertically arranged in the cleaning shell. The water injection pipe sequentially penetrates the lifting shell and the follower shell along the vertical direction and extends to the bottom of the cleaning shell. The water injection pipe is used to discharge the cleaning liquid from the bottom of the cleaning shell.

[0011] Preferably, a plurality of rollers rotating in the radial direction of the cleaning shell are arranged around the axis of the cleaning shell at the bottom of the cleaning shell. The rollers are in rolling cooperation with the bottom of the follower shell in the detection area.

[0012] Preferably, the cleaning unit further includes a self-cleaning unit for cleaning the trigger block and the cleaning shell. The self-cleaning unit includes a cleaning sleeve arranged above the cleaning shell. When the cleaning shell rises vertically, it can slide into the cleaning sleeve. A plurality of nozzles capable of spraying cleaning liquid are evenly distributed on the cleaning sleeve.

[0013] Preferably, a lifting frame is arranged above the cleaning shell. The cleaning shell moves synchronously along the vertical direction with the lifting frame. A driving unit for driving the cleaning shell to rotate is arranged on the lifting frame.

[0014] Preferably, an air vent groove is formed in the follower shell. The trigger block is arranged to move horizontally in the air vent groove. A second spring is arranged in the air vent groove. A lower pressure plate is fixedly arranged at the upper part of the second spring. When the lower pressure plate descends, the trigger block slides out of the air vent groove.

[0015] Preferably, a corrugated sleeve is vertically arranged between the upper part of the lifting shell and the upper part of the cleaning shell. An air pump for inflating the corrugated sleeve is arranged at the upper part of the corrugated sleeve. The corrugated sleeve communicates with the upper part of the air vent groove.

[0016] The beneficial effects of the present invention compared with the prior art are:

[0017] 1. In the present invention, by providing a lifting shell and a follower shell, and arranging a torque monitoring unit between the lifting shell and the follower shell, when the cleaning unit detects the inner wall of the container, the lifting shell drives the follower shell to rotate through the torque monitoring unit. The follower shell drives the trigger block to rotate synchronously. The trigger block is in sliding fit with the inner wall of the container. While driving the follower shell to rotate, the lifting shell also drives the follower shell to rise vertically, causing the trigger block to gradually rise in a spiral shape. In this way, the trigger block can completely sweep the inner wall of the container. At the same time, a preset threshold range is set for the torque monitoring unit. When the container is cleaned, if there is no oil stain in the container, during the process of the trigger block contacting the inner wall of the container, the value monitored by the torque monitoring unit is always within the threshold range. If there is an oil stain on the inner wall of the container, when the trigger block passes through the oil stain position, the friction coefficient between the trigger block and the inner wall of the container is greatly reduced. At this time, the torque monitored by the torque monitoring unit will suddenly drop and be lower than the threshold range. If this is the case, it indicates that the container is not cleaned cleanly and needs to be cleaned again. The present invention makes the standard for detecting the cleanliness of the container unified, avoids the subjectivity existing in the artificial detection of the cleanliness of the inner wall of the container, and realizes the accurate detection of the cleanliness inside the container.

[0018] 2. By arranging a detection area and a sealing area in the cleaning shell, and fixedly setting a sealing disk at the bottom of the follower shell, when the lifting shell drives the follower shell to lift and lower, the sealing disk can seal the trigger block in the sealing area, so that the trigger block will not come into contact with the oil stain during the process of the cleaning shell cleaning the container, ensuring the cleanliness of the trigger block, and further ensuring the accuracy of the trigger block in the subsequent detection process of the cleanliness of the inner wall of the container. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 is a three-dimensional schematic diagram when an automatic sampling device for an oil-containing sewage treatment system of the present invention cleans a container.

[0020] Figure 2 is a side view when an automatic sampling device for an oil-containing sewage treatment system of the present invention cleans a container.

[0021] Figure 3 is an automatic sampling device for an oil-containing sewage treatment system of the present invention Figure 2 sectional schematic view at A - A.

[0022] Figure 4 is an automatic sampling device for an oil-containing sewage treatment system of the present invention Figure 3 partial enlarged schematic view at B.

[0023] Figure 5 is a sectional three-dimensional schematic diagram when the trigger block of an automatic sampling device for an oil-containing sewage treatment system of the present invention is in the detection area.

[0024] Figure 6 is a partial enlarged schematic view of the C position in Figure 5 an automatic sampling device for an oil-containing sewage treatment system according to the present invention.

[0025] Figure 7 is a sectional three-dimensional schematic view when a trigger block in an automatic sampling device for an oil-containing sewage treatment system according to the present invention is in a sealed area.

[0026] Figure 8 is a sectional three-dimensional schematic view of an automatic sampling device for an oil-containing sewage treatment system according to the present invention.

[0027] Figure 9 is an automatic sampling device for an oil-containing sewage treatment system according to the present invention Figure 8 a partial enlarged schematic view of the D position in

[0028] Figure 10 is an automatic sampling device for an oil-containing sewage treatment system according to the present invention Figure 8 a partial enlarged schematic view of the E position in

[0029] Figure 11 is a three-dimensional schematic view of an automatic sampling device for an oil-containing sewage treatment system according to the present invention after removing the self-cleaning unit and the cleaning shell.

[0030] Figure 12 is an automatic sampling device for an oil-containing sewage treatment system according to the present invention Figure 11 a partial enlarged schematic view of the F position in

[0031] The reference numerals in the figure are:

[0032] 1. Container; 2. Cleaning unit; 21. Trigger block; 22. Follow-up shell; 221. Ventilation groove; 222. Second spring; 223. Lower pressing plate; 23. Lifting shell; 231. Corrugated sleeve; 232. Air pump; 24. Torsion monitoring unit; 241. First spring; 242. First extension part; 243. Second extension part; 25. Cleaning shell; 251. Cleaning brush; 252. Sector groove; 253. Sealing disc; 254. Water injection pipe; 255. Roller; 26. Self-cleaning unit; 261. Cleaning sleeve; 262. Sprayer; 263. First rotary driver; 264. Lead screw; 27. Lifting frame; 28. Driving unit; 281. Second rotary driver; 282. Gear; 283. Tooth ring. Detailed implementation manners

[0033] In order to further understand the features, technical means, specific purposes and functions achieved by the present invention, the present invention will be further described in detail below with reference to the drawings and specific implementation manners.

[0034] Reference Figures 1-3 : An automatic sampling device for an oily sewage treatment system, comprising a cleaning unit 2 for cleaning a container 1; the cleaning unit 2 includes a lifting shell 23 that moves vertically, a follower shell 22 is rotatably arranged at the lower part of the lifting shell 23, a trigger block 21 is horizontally moved at the lower part of the follower shell 22, when the trigger block 21 extends out, it can contact the inner wall of the container 1 and the pressure of the trigger block 21 on the inner wall of the container 1 is constant, a torsion monitoring unit 24 is arranged between the follower shell 22 and the lifting shell 23, when detecting the cleanliness of the inner wall of the container 1, the lifting shell 23 drives the follower shell 22 to rotate through the torsion monitoring unit 24, and the torsion monitoring unit 24 is used for monitoring the frictional force between the trigger block 21 and the inner wall of the container 1.

[0035] The container 1 is used for sampling oily sewage. The automatic sampling device has a sampling station and a cleaning station. A sampling unit for driving the container 1 to lift is arranged at the sampling station, and a cleaning unit 2 for driving the container 1 to be cleaned is arranged at the cleaning station. The automatic sampling device further includes a switching unit for driving the container 1 to switch between the sampling station and the cleaning station. When collecting, the cleaning of the container 1 after collecting oily sewage is more difficult than collecting traditional sewage, and it is difficult to accurately judge the cleaning condition inside the container 1. After the oily sewage in the container 1 is taken out, there must be some oil stains inside the container 1. If the oil stains have a color, the oil stains can be distinguished by a visual sensor, so as to judge whether the oil stains in the container 1 are washed clean. However, some oil stains are transparent, resulting in the visual sensor being unable to correctly judge the cleaning condition inside the container 1. After cleaning the container 1 like this, it is necessary to intervene manually, that is, by touching the inner wall of the container 1 with a finger and sliding between the finger and the inner wall of the container 1 to judge whether there is oil stain residue in the container 1. And when detecting each time, the human feeling is subjective, and the judgment criteria of each person also have errors, and the feeling of the same person about whether there is oil stain in the container 1 at different times is also different, resulting in a large fluctuation in the criteria for judging the cleanliness of the container 1.

[0036] In order to avoid the above situation, the cleaning unit 2 in the automatic sampling device is redesigned, so that after the cleaning unit 2 cleans the inner wall of the container 1, the cleaning unit 2 can self-check the cleaning condition of the inner wall of the container 1, making the detection criteria unified, avoiding the subjectivity in the manual detection of the cleanliness of the inner wall of the container 1, and realizing the accurate detection of the cleanliness inside the container 1. The specific structure and working process of the cleaning unit 2 are as follows:

[0037] First, when cleaning the container 1, first insert the cleaning unit 2 vertically into the container 1 from the opening of the container 1. The cleaning unit 2 continuously injects the cleaning liquid into the container 1 during the insertion process. The specific cleaning process of the cleaning unit 2 will be described below. This paragraph mainly describes the process of the cleaning unit 2 performing a self-inspection on the cleanliness of the container 1 after the cleaning unit 2 finishes cleaning the container 1. After the cleaning is completed, the cleaning unit 2 is first withdrawn from the container 1, and then the container 1 is turned over to pour out the water stains remaining in the container 1. Then the container 1 rotates back to the normal position, and the cleaning unit 2 descends again and is inserted into the container 1 from the opening of the container 1. When the cleaning unit 2 reaches the bottom of the container 1, the trigger block 21 horizontally moved on the follower shell 22 extends out and contacts the inner wall of the container 1. The pressure between the trigger block 21 and the inner wall of the container 1 is always constant after contact. When the inner wall of the container 1 is detected, the lifting shell 23 moves the follower shell through the torque monitoring unit 24. 22 is driven to rotate. When the rotation of the follower shell 22 encounters resistance, the lifting shell 23 and the follower shell 22 rotate relative to each other, and the torque monitoring unit 24 can monitor the torque change between the lifting shell 23 and the follower shell 22. The torque monitored by the torque monitoring unit 24 is directly proportional to the friction between the trigger block 21 and the inner wall of the container 1, that is, the greater the friction, the greater the torque, and conversely, the smaller the friction, the smaller the torque. The friction between the trigger block 21 and the inner wall of the container 1 can be determined by monitoring the torque. It is worth noting that when the lifting shell 23 drives the follower shell 22 to rotate through the torque monitoring unit 24, the trigger block 21 arranged on the follower shell 22 slides relative to the inner wall of the container 1. When all the oil stains on the inner wall of the container 1 are removed, the trigger block 21 slides relative to the inner wall of the container 1 and the friction force remains constant. The constant friction force means that the friction force fluctuates within a certain threshold range. This is because there are still some water stains on the side wall of the container 1. When the trigger block 21 slides with the side wall of the container 1, the friction coefficient is easily slightly reduced when the trigger block 21 passes the water stain position. The change in friction between the clean container 1 and the torque monitoring unit 24 sets a threshold range for the value monitored by the torque monitoring unit 24, so that the cleanliness of the inner wall of the container 1 can be accurately judged. If there is no oil stain on the inner wall of the container 1, when the trigger block 21 contacts the container 1, the value monitored by the torque monitoring unit 24 is always within the set threshold range. If there is oil stain on the inner wall of the container 1, when the trigger block 21 contacts the container 1, the friction coefficient of the trigger block 21 will be greatly reduced when passing the oil stain position, resulting in a significant reduction in the torque value monitored by the torque monitoring unit 24. If the detected torque value is lower than the threshold range, it means that the container 1 is not clean. When the follower shell 22 rotates with the lifting shell 23, the lifting shell 23 also drives the follower shell 22 to rise in the vertical direction, so that the trigger block 21 can completely sweep the side wall of the container 1, thus completing the comprehensive detection of the inner wall of the container 1.

[0038] By providing a lifting housing 23 and a follower housing 22, and arranging a torsion monitoring unit 24 between the lifting housing 23 and the follower housing 22, when the cleaning unit 2 detects the inner wall of the container 1, the lifting housing 23 drives the follower housing 22 to rotate through the torsion monitoring unit 24. The follower housing 22 drives the trigger block 21 to rotate synchronously. The trigger block 21 is in sliding fit with the inner wall of the container 1. While driving the follower housing 22 to rotate, the lifting housing 23 also drives the follower housing 22 to rise in the vertical direction, causing the trigger block 21 to gradually rise in a spiral shape. In this way, the trigger block 21 can completely sweep the inner wall of the container 1. At the same time, a preset threshold range is set for the torsion monitoring unit 24. When the container 1 is cleaned, if there is no oil stain in the container 1, during the process of the trigger block 21 contacting the inner wall of the container 1, the value monitored by the torsion monitoring unit 24 is always within the threshold range. If there is an oil stain on the inner wall of the container 1, when the trigger block 21 passes through the oil stain position, the friction coefficient between the trigger block 21 and the inner wall of the container 1 will be greatly reduced. At this time, the torsion monitored by the torsion monitoring unit 24 will suddenly drop, and the torsion is lower than the threshold range. If this is the case, it indicates that the container 1 is not cleaned cleanly and needs to be cleaned again. The present invention makes the standard for detecting the cleanliness of the container 1 unified, avoids the subjectivity existing in the manual detection of the cleanliness of the inner wall of the container 1, and realizes the accurate detection of the cleanliness inside the container 1.

[0039] Refer to Figure 12 : A first extension part 242 is provided at the lower part of the lifting housing 23, a second extension part 243 is provided at the upper part of the follower housing 22, a first spring 241 is arranged between the first extension part 242 and the second extension part 243, and a pressure sensor for detecting the elastic force of the first spring 241 is provided at any one end of the first spring 241.

[0040] When detecting the inner wall of the container 1, the trigger block 21 contacts the inner wall of the container 1. The lifting housing 23 rotates first. The lifting housing 23 squeezes the second extension part 243 through the first extension part 242 and the first spring 241, causing the second extension part 243 to drive the follower housing 22 to rotate. Since there is a frictional force when the trigger block 21 contacts the inner wall of the container 1, the first spring 241 will contract. When the elastic force of the first spring 241 is greater than the frictional force between the trigger block 21 and the container 1, the trigger block 21 can slide relative to the container 1. When there is an oil stain on the side wall of the container 1, the friction coefficient of the trigger block 21 will be greatly reduced when it passes through the oil stain, resulting in a sudden decrease in the compression amount of the first spring 241, causing the elastic force monitored by the pressure sensor to suddenly decrease. The elastic force corresponds to the torsion mentioned above, that is, the change in the elastic force of the first spring 241 is used to judge the change in the frictional force between the trigger block 21 and the container 1.

[0041] Refer to Figure 7 and Figure 8:The cleaning unit 2 further includes a cleaning housing 25 sleeved around the periphery of the lifting housing 23 and capable of driving the lifting housing 23 to rotate. A sealing area and a detection area are arranged vertically in the cleaning housing 25. When the trigger block 21 that moves up and down synchronously with the lifting housing 23 is located in the sealing area, the trigger block 21 is isolated from the outside. When the trigger block 21 is located in the detection area, the trigger block 21 can extend out from the follower housing 22 and contact the inner wall of the container 1.

[0042] Cleaning brushes 251 are uniformly arranged on the outer wall of the cleaning housing 25. When the cleaning housing 25 extends into the container 1, the cleaning housing 25 rotates, so that the cleaning brushes 251 arranged on the cleaning housing 25 clean the inner wall of the container 1. However, when the cleaning housing 25 extends into the container 1 with a large amount of oil stains, the follower housing 22 and the trigger block 21 will also extend into the container 1 together with the cleaning housing 25. If the trigger block 21 is not isolated, when the cleaning housing 25 cleans the oil stains in the container 1, the oil stains will adhere to the trigger block 21, causing a large amount of oil stains to cover the periphery of the trigger block 21, resulting in a large deviation in the subsequent detection results. In order to prevent the trigger block 21 from being contaminated by oil stains when the cleaning housing cleans the container 1, a sealing area and a detection area are provided for the cleaning housing. When the cleaning housing 25 cleans the container 1, the trigger block 21 and the follower block are located in the sealing area of the cleaning housing 25. At this time, the oil stains in the container 1 will not contact the trigger block 21. After the container 1 is cleaned, the lifting block drives the trigger block 21 to descend, so that the trigger block 21 moves to the detection area, and the trigger block 21 can smoothly extend out from the follower housing 22 and contact the inner wall of the container 1.

[0043] Refer to Figure 7 、 Figure 8 and Figure 11 :A sector-shaped groove 252 for the trigger block 21 to pass through is formed in the side wall of the cleaning housing 25, and the sector-shaped groove 252 constitutes the detection area. A sealing disk 253 with the same diameter as the inner diameter of the cleaning housing 25 is fixedly arranged at the bottom of the follower housing 22. When the sealing disk 253 is located above the sector-shaped groove 252, the sealing disk 253 and the cleaning housing 25 form a sealing area.

[0044] The sealing disk 253 is located below the trigger block 21. When the sealing disk 253 rises with the follower housing 22 to above the sector-shaped groove 252, the sealing disk 253 and the cleaning housing 25 form a sealing area. At this time, the cleaning housing 25 can clean the inside of the container 1. The sealing disk 253 seals the trigger block 21 in the cleaning housing 25, so that the trigger block 21 is isolated, ensuring that the trigger block 21 will not be contaminated by oil stains during the process of the cleaning housing 25 cleaning the container 1.

[0045] Refer to Figures 3-5: A water injection pipe 254 is vertically arranged inside the cleaning shell 25. The water injection pipe 254 successively penetrates through the lifting shell 23 and the follower shell 22 along the vertical direction and extends to the bottom of the cleaning shell 25. The water injection pipe 254 is used to discharge the cleaning liquid from the bottom of the cleaning shell 25.

[0046] When the cleaning shell 25 cleans the inner wall of the container 1 through the cleaning brush 251, the water injection pipe 254 can simultaneously inject the cleaning liquid into the container 1, improving the cleaning effect of the cleaning shell 25 on the container 1.

[0047] Refer to Figure 4 and Figure 7 : A plurality of rollers 255 that rotate in the radial direction of the cleaning shell 25 are arranged around the axis of the cleaning shell 25 at the bottom of the cleaning shell 25. The rollers 255 are in rolling cooperation with the bottom of the follower shell 22 in the detection area.

[0048] If the rollers 255 are not provided, the friction coefficient between the follower shell 22 and the bottom of the detection area is relatively high. In order to reduce the influence of the friction force of the bottom of the detection area on the rotation of the follower shell 22, the rollers 255 are arranged at the bottom of the detection area, enabling the follower shell 22 to rotate more easily.

[0049] Refer to Figure 3 and Figure 5 : The cleaning unit 2 further includes a self-cleaning unit 26 for cleaning the trigger block 21 and the cleaning shell 25. The self-cleaning unit 26 includes a cleaning sleeve 261 arranged above the cleaning shell. When the cleaning shell 25 rises vertically, it can slide into the cleaning sleeve 261. A plurality of spray nozzles 262 that can spray the cleaning liquid are evenly distributed on the cleaning sleeve 261.

[0050] The self-cleaning unit 26 further includes a first rotary driver 263 and a lead screw 264. The lead screw 264 is vertically and rotatably arranged in the cleaning sleeve 261. The output end of the first rotary driver 263 is fixedly connected to the lead screw 264. A lifting frame 27 that rises and falls synchronously with the cleaning shell 25 is arranged on the upper part of the cleaning shell 25. The lead screw 264 penetrates through the lifting frame 27 and is in threaded cooperation with the lifting frame 27. After the trigger block 21 contacts the inner wall of the container 1 each time, the cleaning shell 25 drives the cleaning block to rise and slide into the cleaning sleeve 261. Subsequently, the spray nozzles 262 spray the cleaning liquid, and the cleaning liquid cleans the trigger block 21. The spraying time of the spray nozzles 262 can be set according to the actual situation. After reaching the rated time, the spray nozzles 262 switch to spraying clean water to clean the trigger block 21.

[0051] Refer to Figure 5 and Figure 9 : A lifting frame 27 is arranged above the cleaning shell 25. The cleaning shell 25 moves synchronously along the vertical direction with the lifting frame 27. A driving unit 28 for driving the cleaning shell 25 to rotate is arranged on the lifting frame 27.

[0052] The driving unit 28 includes a second rotary driver 281, a gear 282, and a toothed ring 283. The toothed ring 283 is fixedly arranged on the upper part of the cleaning shell 25. The toothed ring 283 is rotatably arranged on the lifting frame 27. A gear 282 is meshed on one side of the toothed ring 283. The second rotary driver 281 is arranged on the lifting frame 27 and drives the gear 282. The second rotary driver 281 is preferably a servo motor.

[0053] Refer to Figure 6 、 Figure 7 and Figure 10 : An air vent groove 221 is formed in the follower shell 22. The trigger block 21 is horizontally movably arranged in the air vent groove 221. A second spring 222 is arranged in the air vent groove 221. A lower pressing plate 223 is fixedly arranged on the upper part of the second spring 222. When the lower pressing plate 223 descends, the trigger block 21 slides out of the air vent groove 221.

[0054] Refer to Figure 8 and Figure 11 : A corrugated sleeve 231 is vertically arranged between the upper part of the lifting shell 23 and the upper part of the cleaning shell 25. An air pump 232 for inflating the corrugated sleeve 231 is arranged on the upper part of the corrugated sleeve 231. The corrugated sleeve 231 communicates with the upper part of the air vent groove 221.

[0055] The lifting shell 23 can only move along the height direction of the cleaning shell 25. Only when the cleaning shell 25 rotates, the lifting shell 23 can rotate synchronously with the cleaning shell 25. After the container 1 is cleaned, the air pump 232 inflates the corrugated sleeve 231, causing the corrugated sleeve 231 to gradually elongate. The lifting sleeve drives the follower sleeve to descend together. At this time, due to the lower pressing plate 223 and the second spring 222 arranged in the air vent groove 221, under the elastic force of the second spring 222, the trigger block 21 arranged in the air vent groove 221 will not slide out and contact the inner wall of the cleaning shell 25, reducing the sliding wear between the trigger block 21 and the inner wall of the cleaning shell 25. When the follower shell 22 descends to the detection area and contacts the bottom of the detection area, at this time, the air pump 232 continues to inflate the corrugated sleeve 231, and the corrugated sleeve 231 no longer stretches. The lower pressing plate 223 presses the second spring 222, causing the air in the lower part of the air vent groove 221 to push the trigger block 21 out. After the trigger block 21 is self-cleaned by the self-cleaning unit 26, the air pump 232 pumps out the air in the corrugated sleeve 231. The second spring 222 first pushes the lower pressing plate 223 to reset, and the trigger block 21 slides into the air vent groove 221. Subsequently, the corrugated sleeve 231 begins to contract, and the lifting shell 23 drives the trigger block 21 to rise into the sealing area.

[0056] Working principle: After cleaning, the cleaning unit 2 is first withdrawn from the container 1, and then the container 1 is turned over to pour out the water stains remaining in the container 1, and then the container 1 is turned back to the normal position, and the cleaning unit 2 is lowered again and inserted into the container 1 from the opening of the container 1. When the cleaning unit 2 reaches the bottom of the container 1, the trigger block 21 arranged on the follower shell 22 moves horizontally and extends out and contacts the inner wall of the container 1. The pressure of the trigger block 21 and the inner wall of the container 1 is always constant after contact. When the inner wall of the container 1 is detected, the lifting shell 23 moves the follower shell 22 through the torque monitoring unit 24. The movable shell 22 is driven to rotate. When the rotation of the follower shell 22 encounters resistance, the lifting shell 23 and the follower shell 22 rotate relative to each other, and the torque monitoring unit 24 can monitor the torque change between the lifting shell 23 and the follower shell 22. The torque monitored by the torque monitoring unit 24 is directly proportional to the friction between the trigger block 21 and the inner wall of the container 1, that is, the greater the friction, the greater the torque, and conversely, the smaller the friction, the smaller the torque. The friction between the trigger block 21 and the inner wall of the container 1 can be determined by monitoring the torque. It is worth noting that when the lifting shell 23 drives the follower shell 22 to rotate through the torque monitoring unit 24, the trigger block 21 arranged on the follower shell 22 slides relative to the inner wall of the container 1. When all the oil stains on the inner wall of the container 1 are removed, the trigger block 21 slides relative to the inner wall of the container 1 and the friction force remains constant. The constant friction force means that the friction force fluctuates within a certain threshold range. This is because there are still some water stains on the side wall of the container 1. When the trigger block 21 slides with the side wall of the container 1, the friction coefficient is easily slightly reduced when the trigger block 21 passes the water stain position. The change in friction between the clean container 1 and the torque monitoring unit 24 sets a threshold range for the value monitored by the torque monitoring unit 24, so that the cleanliness of the inner wall of the container 1 can be accurately judged. If there is no oil stain on the inner wall of the container 1, when the trigger block 21 contacts the container 1, the value monitored by the torque monitoring unit 24 is always within the set threshold range. If there is oil stain on the inner wall of the container 1, when the trigger block 21 contacts the container 1, the friction coefficient of the trigger block 21 will be greatly reduced when passing the oil stain position, resulting in a significant reduction in the torque value monitored by the torque monitoring unit 24. If the detected torque value is lower than the threshold range, it means that the container 1 is not clean. When the follower shell 22 rotates with the lifting shell 23, the lifting shell 23 also drives the follower shell 22 to rise in the vertical direction, so that the trigger block 21 can completely sweep the side wall of the container 1, thus completing the comprehensive detection of the inner wall of the container 1.

[0057] The above embodiments merely represent one or several implementation manners of the present invention. The description thereof is relatively specific and detailed, but it should not be construed as a limitation on the protection scope of the present invention. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present invention, several modifications and improvements can still be made, and these all fall within the protection scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the appended claims.

Claims

1. An automatic sampling device for an oily wastewater treatment system, comprising a cleaning unit (2) for cleaning a container (1); It is characterized in that The cleaning unit (2) comprises a lifting shell (23) that moves in a vertical direction, a follower shell (22) that is rotatably arranged at the bottom of the lifting shell (23), a trigger block (21) that is horizontally movably arranged at the bottom of the follower shell (22), the trigger block (21) being able to contact the inner wall of the container (1) when extended, and the pressure of the trigger block (21) on the inner wall of the container (1) being constant, a torque monitoring unit (24) being arranged between the follower shell (22) and the lifting shell (23), when the cleanliness of the inner wall of the container (1) is detected, the lifting shell (23) drives the follower shell (22) to rotate through the torque monitoring unit (24), and the torque monitoring unit (24) is used to monitor the friction between the trigger block (21) and the inner wall of the container (1); A first extension portion (242) is provided at the lower part of the lifting shell (23), a second extension portion (243) is provided at the upper part of the follower shell (22), a first spring (241) is provided between the first extension portion (242) and the second extension portion (243), and a pressure sensor for detecting the elastic force of the first spring (241) is provided at either end of the first spring (241); The cleaning unit (2) further comprises a cleaning shell (25) which is sleeved on the outer periphery of the lifting shell (23) and can drive the lifting shell (23) to rotate. A sealing area and a detection area are arranged in the cleaning shell (25) along the vertical direction. When the trigger block (21) which rises and falls synchronously with the lifting shell (23) is located in the sealing area, the trigger block (21) is isolated from the outside. When the trigger block (21) is located in the detection area, the trigger block (21) can extend from the follower shell (22) and contact the inner wall of the container (1). A fan-shaped groove (252) for the trigger block (21) to pass through is formed on the side wall of the cleaning shell (25), and the fan-shaped groove (252) constitutes a detection area. A sealing disk (253) having a diameter identical to that of the inner ring of the cleaning shell (25) is fixedly arranged at the bottom of the follower shell (22). When the sealing disk (253) is located above the fan-shaped groove (252), the sealing disk (253) and the cleaning shell (25) form a sealing area.

2. The automatic sampling device for oily wastewater treatment system according to claim 1, characterized in that: A water injection pipe (254) is vertically arranged in the cleaning shell (25). The water injection pipe (254) sequentially penetrates the lifting shell (23) and the follower shell (22) in a vertical direction and extends to the bottom of the cleaning shell (25). The water injection pipe (254) is used to discharge cleaning liquid from the bottom of the cleaning shell (25).

3. The automatic sampling device for oily wastewater treatment system according to claim 1, characterized in that: A plurality of rollers (255) are arranged at the bottom of the cleaning shell (25) around the axis of the cleaning shell (25) and rotate in the radial direction of the cleaning shell (25). The rollers (255) roll in cooperation with the bottom of the follower shell (22) in the detection area.

4. The automatic sampling device for oily wastewater treatment system according to claim 1, characterized in that: The cleaning unit (2) further comprises a self-cleaning unit (26) for cleaning the trigger block (21) and the cleaning shell (25); the self-cleaning unit (26) comprises a cleaning sleeve (261) arranged above the cleaning shell (25); the cleaning shell (25) can slide into the cleaning sleeve (261) when rising in a vertical direction; a plurality of nozzles (262) capable of spraying cleaning liquid are evenly distributed on the cleaning sleeve (261).

5. The automatic sampling device for oily wastewater treatment system according to claim 1, characterized in that: A lifting frame (27) is arranged above the cleaning shell (25), and the cleaning shell (25) moves synchronously with the lifting frame (27) in a vertical direction. A driving unit (28) for driving the cleaning shell (25) to rotate is arranged on the lifting frame (27).

6. The automatic sampling device for oily wastewater treatment system according to claim 1, characterized in that: A vent groove (221) is provided in the follower housing (22), and the trigger block (21) is arranged in the vent groove (221) so as to move in a horizontal direction. A second spring (222) is arranged in the vent groove (221), and a lower pressure plate (223) is fixedly arranged on the upper part of the second spring (222). When the lower pressure plate (223) descends, the trigger block (21) slides out of the vent groove (221) and contacts the inner wall of the container (1).

7. The automatic sampling device for oily wastewater treatment system according to claim 6, characterized in that: A bellows sleeve (231) is vertically arranged between the upper portion of the lifting shell (23) and the upper portion of the cleaning shell (25), an air pump (232) for inflating the bellows sleeve (231) is arranged on the upper portion of the bellows sleeve (231), and the bellows sleeve (231) is communicated with the upper portion of the ventilation groove (221).

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