A food box production water pollution monitoring instrument and a method of using the same

Abstract

The application provides a food box production water pollution monitoring instrument and a use method thereof, which comprises a top cylinder and a circuit board. The circuit board is installed on the top of the inside of the top cylinder. A storage cylinder is fixed at the bottom of the top cylinder. A submersible pump is installed at the bottom of the inside of the storage cylinder. A connecting cylinder is vertically fixed at the middle of the storage cylinder. A detection head is connected to the bottom of the circuit board through a signal line. Electric push rods are installed at the front, back, left and right ends of the bottom of the top cylinder. A bottom cylinder is installed at the bottom of the power output end of the electric push rod. An auxiliary assembly is arranged in the inside of the bottom cylinder. The application adopts three-stage gradient filtration to only intercept solid particles and completely retain dissolved substances to be measured, effectively prevents blockage and scaling, and cooperates the inside-out backwashing filter screen with the centrifugal force driven touch plate scraping the outer wall of the detection head to form double online self-cleaning of "scraping + flushing", so that the filtration flux and the probe cleanliness can be maintained without shutdown and disassembly, and the accuracy and continuity of water quality detection are ensured.

Description

Technical Field

[0001] This invention relates to the field of water quality monitoring technology, and in particular to an instrument for monitoring water pollution in food box production and its usage method. Background Technology

[0002] Food packaging boxes (including plastic turnover boxes, paper food boxes, hollow board packaging boxes, etc.) involve multiple water usage stages during production, primarily including injection molding machine circulating cooling water, mold spray cooling water, finished box cleaning water, workshop floor cleaning wastewater, and equipment CIP cleaning return water. These water bodies generally contain characteristic pollutants such as plastic debris, mold release agent colloids, trace organic matter from printing inks, suspended particles, and scale ions. To ensure the hygiene and safety of food packaging boxes, prevent secondary pollution of the boxes due to substandard water usage, and meet the compliance requirements of food production enterprises, real-time online monitoring of the water quality used in production is necessary.

[0003] Existing online water quality monitoring instruments typically use sensors directly immersed in the main pipeline or water tank for detection. Although some instruments are equipped with bypass sampling pipelines, they still have the following shortcomings under the special operating conditions of water used in food processing: Firstly, the water used in food box production contains a large amount of plastic debris, mold release agent colloids, and suspended particles. When the sensor is directly immersed in the water or the bypass pipeline is not effectively filtered, these impurities are easily attached to and accumulated on the surface of the sensor electrode, causing electrode scaling and pipeline blockage. This leads to drift in detection data and decreased accuracy, requiring frequent disassembly, cleaning, and maintenance, resulting in high operating costs and affecting production continuity.

[0004] Secondly, the existing bypass sampling devices have unreasonable filter structure designs. Some use a single high-precision filter element, which can intercept solid particles, but easily adsorbs dissolved mold release agents, ink organic matter, and other target substances in the water, resulting in low detection values ​​for indicators such as COD and surfactants, and distorted detection results. Others have insufficient filtration precision and cannot effectively block fine suspended particles, still resulting in sensor contamination and clogging. It is difficult to achieve a balance between "filtering to protect the sensor" and "retaining the pollutants to be tested".

[0005] Third, the existing monitoring instruments' filter components lack effective self-cleaning methods. After the filter screen traps impurities, it gradually becomes clogged and can only be cleaned by manually disassembling and replacing the filter element. It is impossible to complete backwashing online during equipment operation, resulting in a continuous decrease in filtration flux and unstable sampling water volume, which further affects the continuity and accuracy of detection.

[0006] Fourth, existing instruments have a relatively simple method for cleaning the detection probe, usually only soaking in water or rinsing. This is difficult to completely remove plastic debris, scale and biological film that are tightly attached to the outer wall of the probe. There is a lack of a dual cleaning mechanism that combines mechanical scraping and fluid rinsing. The residual pollutants on the probe surface continue to interfere with the detection signal, and the detection error increases significantly after long-term operation.

[0007] In summary, existing technologies lack a water pollution monitoring instrument that can adapt to the special operating conditions of water used in food container production, effectively prevent sensor clogging, combine tiered filtration and online backwashing functions, and achieve dual cleaning of the detection head through "scraping + rinsing." Therefore, it is necessary to develop a new type of water pollution monitoring instrument for food container production and its usage method to solve the aforementioned technical problems. Summary of the Invention

[0008] The purpose of this invention is to solve the problems existing in the above-mentioned background art, and to propose a water pollution monitoring instrument for food box production and its usage method.

[0009] To achieve the above objectives, the present invention adopts the following technical solution: A water pollution monitoring instrument for food box production includes a top cylinder and a circuit board. The circuit board is installed on the upper part of the top cylinder, and a storage cylinder is fixed at the lower bottom of the top cylinder. A submersible pump is installed at the lower inside of the storage cylinder. A connecting cylinder is vertically fixed in the middle of the storage cylinder. A detection head is connected to the bottom of the circuit board via a signal line. Electric push rods are installed at the front, rear, left, and right ends of the bottom of the top cylinder. A bottom cylinder is installed at the bottom of the push rod at the power output end of the electric push rod. An auxiliary component is arranged inside the bottom cylinder.

[0010] Preferably, the auxiliary component consists of an adapter ring, a servo motor, a fixed plate, an outer cleaning plate, a middle cleaning plate, an inner cleaning plate, an outer filter screen, a middle filter screen, an inner filter screen, a transmission plate, a fixed base, an extension frame, a contact plate, a counterweight, a return spring, and a solenoid valve. Specifically, an adapter ring is installed in the middle of the upper surface of the bottom cylinder, a servo motor is installed at the front end of the upper surface of the bottom cylinder, a fixed plate is embedded in the upper part of the bottom cylinder, an outer cleaning plate, a middle cleaning plate and an inner cleaning plate are installed sequentially from left to right on the bottom left side of the fixed plate, an outer filter screen, a middle filter screen and an inner filter screen are installed in the lower part of the bottom cylinder, a transmission plate is installed on the upper surface of the fixed plate, fixed seats are fixed at both the front and rear ends of the bottom of the fixed plate, an extension frame is embedded between the two fixed seats, a contact plate is installed on the left side of the extension frame, a counterweight is installed on the right side of the extension frame, a return spring is fixedly connected to the right side of the two fixed seats, and a solenoid valve is installed at the bottom of the bottom cylinder.

[0011] Preferably, the bottom of the adapter ring is embedded in the upper part of the inside of the transmission disk, the outer wall of the bottom end of the adapter ring is in close contact with the upper part of the inner wall of the transmission disk, and the discharge end of the submersible pump is connected to the upper part of the inside of the transmission disk through a pipe.

[0012] Preferably, the power output end of the servo motor is rotatably connected to the fixed disk via a gear disk, and the transmission disk rotates horizontally on the outer wall of the adapter ring.

[0013] Preferably, the outer cleaning plate, middle cleaning plate, and inner cleaning plate are all hollow structures. Drainage holes are evenly spaced from top to bottom at the ends of the outer cleaning plate, middle cleaning plate, and inner cleaning plate away from the center of the bottom cylinder. Side drainage holes are evenly spaced from top to bottom at the ends of the inner cleaning plate near the center of the bottom cylinder. The tops of the outer cleaning plate, middle cleaning plate, and inner cleaning plate are connected to the lower interior of the transfer disk through the hollow channel inside the fixed disk.

[0014] Preferably, the outer cleaning plate, the middle cleaning plate, and the inner cleaning plate are respectively attached to the outer filter screen, the middle filter screen, and the inner filter screen at the ends away from the center of the bottom cylinder.

[0015] Preferably, the outer filter, middle filter, and inner filter are made of stainless steel coarse filter, PP cotton filter element with a precision of 50μm, and PTFE sintered filter sheet that does not adsorb dissolved organic matter, respectively.

[0016] Preferably, the return spring is fixedly connected between the right side of the fixed base and the extension frame, and the extension frame slides horizontally left and right in the fixed base. When the extension frame moves to the rightmost position, the contact plate is in close contact with the outer wall of the detection head.

[0017] Preferably, the weight of the counterweight is greater than the weight of the contact plate, and the distance between the counterweight and the detection head is greater than the distance between the contact plate and the detection head.

[0018] Preferably, it includes the following steps: S1: After the device is installed on the wastewater pool after food box production, the electric push rod pushes the bottom cylinder body to move down as a whole, so that the bottom cylinder body is immersed in the wastewater pool, and the wastewater enters the interior of the bottom cylinder body through the water inlet at the bottom of the bottom cylinder body; S2: Wastewater passes through the outer filter screen, middle filter screen and inner filter screen in sequence and enters the bottom of the bottom cylinder, where it comes into contact with the detection head. At this time, the detection head collects water quality parameter signals and transmits the signals to the circuit board, which analyzes and processes them to monitor the wastewater. S3: After monitoring is completed, the solenoid valve opens, and the electric push rod pulls the bottom cylinder body to move upward and out of the sewage to return to its original position, so that the sewage that entered the bottom cylinder body flows out due to gravity. S4: The servo motor drives the fixed plate to rotate through the gear disk, so that the outer cleaning plate, middle cleaning plate and inner cleaning plate at the bottom of the fixed plate rotate simultaneously. While the fixed plate is rotating, the counterweight generates a large centrifugal force to pull the extension frame to move to the right along the fixed seat and stick to the outer wall of the detection head, so as to scrape and clean the outer wall of the detection head and remove plastic debris, mold release agent colloid and scale and other impurities attached to the surface of the detection head. S5: The submersible pump delivers the purified water stored in the storage tank to the fixed plate through pipelines, and introduces it into the hollow cavities of the outer cleaning plate, middle cleaning plate, and inner cleaning plate through the hollow channels inside the fixed plate. The purified water then sprays out from the inside to the outside from the drain holes of the outer, middle, and inner cleaning plates, backwashing the outer, middle, and inner filters. At the same time, the purified water sprayed from the drain hole on the side of the inner cleaning plate washes the outer wall of the detection head from all directions, thereby achieving simultaneous cleaning of the three layers of filters and the detection head. The backwashing method from the inside to the outside can wash away the impurities trapped in the filters, prevent the filters from clogging, and ensure the filtration and detection accuracy.

[0019] This invention provides an instrument for monitoring water pollution in food box production and its usage method, which has the following beneficial effects: 1. The outer, middle, and inner filters respectively employ a stainless steel coarse filter, a 50μm precision PP cotton filter element, and a PTFE sintered filter sheet that does not adsorb dissolved organic matter, forming a gradient filtration system from coarse to fine. This system only traps solid plastic debris and suspended particles, while completely retaining dissolved mold release agents, ink organic matter, and various ionic analytes in the water. This solves the problem of detection distortion caused by the adsorption of target pollutants by traditional single high-precision filter elements. It protects the sensor while ensuring the accuracy of the detection results. Furthermore, the high-flow water in the main pipeline does not directly contact the sensor, effectively avoiding high-speed scouring and adhesion contamination of the sensor by impurities such as plastic debris and mold release agent colloids in the water. This significantly reduces the risk of sensor damage and scaling, extends the probe's service life, and reduces maintenance frequency.

[0020] 2. The submersible pump delivers purified water from the storage tank through the hollow channel of the fixed plate into the hollow cavity of each cleaning plate. The water is then sprayed outward from the drain hole and side drain hole, performing a reverse rinsing of the three-layer filter screen. This washes away impurities trapped on the outer side of the filter screen, achieving online self-cleaning without the need to stop the machine to disassemble and replace the filter element. This maintains the filtration throughput and sampling stability, ensuring the continuity of testing. At the same time, the servo motor drives the fixed plate to rotate, and the counterweight pulls the extension frame along the fixed base under the action of centrifugal force, making the contact plate closely adhere to the outer wall of the detection head for scraping and cleaning. Simultaneously, purified water is sprayed out from the side drain hole of the inner cleaning plate to rinse the outer wall of the detection head from all directions, forming a dual cleaning effect of "scraping + rinsing". This can thoroughly remove the plastic debris, scale and biological film tightly attached to the surface of the detection head, ensuring the cleanliness of the detection head surface and the accuracy of the test data. Attached Figure Description

[0021] Figure 1 This is a front view of the overall structure of the present invention; Figure 2 This is a front cross-sectional view of the overall structure in this invention; Figure 3 This is a schematic diagram of a partial structure of the bottom cylinder in this invention; Figure 4 This is a schematic cross-sectional view of the upper surface of a partial structure of the bottom cylinder in this invention; Figure 5 This is a partial exploded view of the bottom cylinder structure in this invention; Figure 6 This is a schematic diagram of a partial front cross-sectional view of the bottom cylinder structure in this invention; Figure 7 This is a schematic diagram of the bottom surface of a partial structure of the fixed disk in this invention; Figure 8 This is a schematic diagram of the contact plate in the clean state of the present invention.

[0022] Legend: Top cylinder 1, circuit board 101, storage cylinder 102, submersible pump 103, connecting cylinder 104, detection head 105, electric push rod 2, bottom cylinder 3, adapter ring 301, servo motor 302, fixed plate 303, outer cleaning plate 304, middle cleaning plate 305, inner cleaning plate 306, outer filter screen 307, middle filter screen 308, inner filter screen 309, transmission plate 30, fixed base 310, extension frame 311, contact plate 312, counterweight block 313, return spring 314, solenoid valve 315. Detailed Implementation

[0023] Example 1, referring to Figure 1-8 A water pollution monitoring instrument for food box production includes a top cylinder 1 and a circuit board 101. The circuit board 101 is installed on the upper part of the top cylinder 1. A storage cylinder 102 is fixed at the lower bottom of the top cylinder 1. A submersible pump 103 is installed at the lower bottom of the storage cylinder 102. A connecting cylinder 104 is vertically fixed in the middle of the storage cylinder 102. A detection head 105 is connected to the bottom of the circuit board 101 through a signal line. Electric push rods 2 are installed at the front, rear, left and right ends of the bottom of the top cylinder 1. A bottom cylinder 3 is installed at the bottom of the push rod at the power output end of the electric push rod 2. An auxiliary component is set inside the bottom cylinder 3.

[0024] The auxiliary components consist of an adapter ring 301, a servo motor 302, a fixed plate 303, an outer cleaning plate 304, a middle cleaning plate 305, an inner cleaning plate 306, an outer filter screen 307, a middle filter screen 308, an inner filter screen 309, a transmission plate 30, a fixed base 310, an extension frame 311, a contact plate 312, a counterweight block 313, a return spring 314, and a solenoid valve 315. An adapter ring 301 is installed in the middle of the upper surface of the bottom cylinder 3. A servo motor 302 is installed at the front end of the upper surface of the bottom cylinder 3. A fixed plate 303 is embedded in the upper part of the bottom cylinder 3. An outer cleaning plate 304, a middle cleaning plate 305, and an inner cleaning plate 306 are installed from left to right on the bottom left side of the fixed plate 303. An outer filter screen 307, a middle filter screen 308, and an inner filter screen 309 are installed in the lower part of the bottom cylinder 3. A transmission plate 30 is installed on the upper surface of the fixed plate 303. Fixed seats 310 are fixed at both the front and rear ends of the bottom of the fixed plate 303. An extension frame 311 is embedded in the interior between the two fixed seats 310. A touch plate 312 is installed on the left side of the extension frame 311. A counterweight 313 is installed on the right side of the extension frame 311. A return spring 314 is fixedly connected to the right side of both fixed seats 310. A solenoid valve 315 is installed at the bottom of the bottom cylinder 3.

[0025] The bottom of the adapter ring 301 is embedded in the upper part of the inside of the transfer disk 30, and the outer wall of the bottom end of the adapter ring 301 is in close contact with the upper part of the inner wall of the transfer disk 30. The discharge end of the submersible pump 103 is connected to the upper part of the inside of the transfer disk 30 through a pipe. The adapter ring 301 is embedded at the bottom of the upper part of the transmission disk 30, and the outer wall of the bottom end of the adapter ring 301 is tightly attached to the upper part of the inner wall of the transmission disk 30, forming an embedded plug-in sealed connection. This effectively prevents pure water from leaking from the connection point during transmission, ensuring stable water pressure and flow. The discharge end of the submersible pump 103 is connected to the upper part of the transmission disk 30 through a pipe, so that the pure water drawn by the submersible pump 103 first flows into the transmission disk 30 for buffering and pressure equalization, and then is evenly distributed to the inner cavity of each cleaning plate through the hollow channels of the adapter ring 301 and the fixed disk 303, avoiding uneven water output from each cleaning plate due to direct water flow impact. The adapter ring 301, as a transitional connection structure between the rotating part and the stationary water supply part, not only ensures continuous water supply under the rotating condition of the fixed disk 303, but also achieves reliable sealing through the embedded tight fit. The structure is simple and easy to assemble, providing a stable and uniform water supply for the backwashing system. The power output end of the servo motor 302 is rotatably connected to the fixed disk 303 through a gear disk, and the transmission disk 30 rotates horizontally on the outer wall of the adapter ring 301. During operation, the servo motor 302 can drive the fixed disk 303 to rotate, so that the outer cleaning plate 304, middle cleaning plate 305 and inner cleaning plate 306 under the fixed disk 303 can rotate simultaneously to rinse and clean the outer wall of the outer filter screen 307, middle filter screen 308, inner filter screen 309 and the detection head 105 in all directions. The outer cleaning plate 304, the middle cleaning plate 305, and the inner cleaning plate 306 are all hollow structures. The outer cleaning plate 304, the middle cleaning plate 305, and the inner cleaning plate 306 have drainage holes that are equally spaced from top to bottom at the ends away from the center of the bottom cylinder 3. The inner cleaning plate 306 has side drainage holes that are equally spaced from top to bottom at the ends close to the center of the bottom cylinder 3. The tops of the outer cleaning plate 304, the middle cleaning plate 305, and the inner cleaning plate 306 are connected to the lower interior of the transfer plate 30 through the hollow channel inside the fixed plate 303. The outer cleaning plate 304, middle cleaning plate 305 and inner cleaning plate 306 are all hollow structures, and their tops are connected to the lower part of the transmission plate 30 through the hollow channel inside the fixed plate 303. This allows pure water to be evenly distributed from the transmission plate 30 to the hollow cavity of each cleaning plate through the fixed plate 303, providing an integrated water delivery channel for backwashing. No additional flushing pipelines are required, and the structure is compact. Each cleaning plate has drainage holes at equal intervals from top to bottom at the end furthest from the center of the bottom cylinder 3. Pure water is sprayed out from the drainage holes from the inside to the outside, which can evenly cover the entire surface of the corresponding filter screen along the height direction, performing a full-range backwash of the three-layer filter screen and thoroughly washing away the trapped impurities. The inner cleaning plate 306 has side drainage holes at equal intervals at the end closest to the center of the bottom cylinder 3, so that pure water can be sprayed out from the side drainage holes at the same time, performing a circumferential rinse of the outer wall of the detection head 105. The above structure, through the cooperation of a set of hollow flow channels and multiple sets of drainage holes, can simultaneously complete the backwashing of the three-layer filter screen and the rinsing of the outer wall of the detection head with a single water supply. The rinsing coverage is uniform and without dead corners, with high cleaning efficiency, effectively preventing filter screen clogging and maintaining the cleanliness of the surface of the detection head 105. The outer cleaning plate 304, the middle cleaning plate 305 and the inner cleaning plate 306 are respectively attached to the outer filter screen 307, the middle filter screen 308 and the inner filter screen 309 at the ends away from the center of the bottom cylinder 3. When the fixed plate 303 drives the three cleaning plates to rotate synchronously, the ends of each cleaning plate can rotate and scrape the surface of the corresponding filter screen, scraping off the plastic debris, suspended particles and colloidal deposits trapped on the outside of the filter screen, realizing synchronous mechanical cleaning of the three filter screens; at the same time, with the backwash water flow from the inside to the outside, a dual cleaning effect of "scraping and peeling + fluid flushing" is formed, which can effectively prevent filter screen clogging, maintain filtration flow and sampling stability, and the three layers work synchronously and correspond one by one, with no dead corners and high efficiency. The filter screen can be self-cleaned online without stopping the machine to disassemble, which significantly reduces the cost of manual maintenance. The outer filter screen 307, the middle filter screen 308, and the inner filter screen 309 are respectively made of stainless steel coarse filter screen, PP cotton filter element with a precision of 50μm, and PTFE sintered filter sheet that does not adsorb dissolved organic matter. The external filter 307, middle filter 308, and internal filter 309 employ a stainless steel coarse filter, a 50μm precision PP cotton filter element, and a PTFE sintered filter sheet that does not adsorb dissolved organic matter, respectively, forming a three-stage gradient filtration structure from coarse to fine: the stainless steel coarse filter first intercepts larger plastic debris and flaky scale in the water; the 50μm precision PP cotton filter element further filters out colloidal suspended solids and fine solid particles; and the PTFE sintered filter sheet blocks tiny suspended particles while not adsorbing dissolved mold release agents, ink organic matter, and various ionic analytes in the water. This design effectively avoids solid impurities entering the detection chamber and contaminating the detection head 105, while completely preserving dissolved target pollutants in the water sample. It solves the technical problem of traditional single high-precision filter elements easily adsorbing target analytes, leading to distortion of indicators such as COD and surfactants.

[0026] Example 2 differs from Example 1 in that, in this example, the return spring 314 is fixedly connected between the right side of the fixed base 310 and the extension frame 311. The extension frame 311 slides horizontally left and right in the fixed base 310. When the extension frame 311 moves to the rightmost position, the touch plate 312 is in close contact with the outer wall of the detection head 105. The weight of the counterweight 313 is greater than the weight of the contact plate 312, and the distance between the counterweight 313 and the detection head 105 is greater than the distance between the contact plate 312 and the detection head 105. During the rotation of the fixed disk 303, the counterweight 313 rotates synchronously with the fixed disk 303 and generates centrifugal force. This centrifugal force pulls the extension frame 311 along the fixed base 310 towards the detection head 105, thereby causing the contact plate 312 to adhere tightly to the outer wall of the detection head 105, providing stable contact pressure for subsequent scraping cleaning. Through the above structure, the centrifugal force generated by the rotation of the fixed disk 303 itself is used as the driving force for the contact plate 312 to adhere to the detection head 105, eliminating the need for additional driving components, resulting in a simple and compact structure. Furthermore, the magnitude of the centrifugal force is positively correlated with the rotation speed of the fixed disk 303, and the scraping pressure between the contact plate 312 and the outer wall of the detection head 105 can be flexibly controlled by adjusting the rotation speed of the servo motor 302, ensuring both cleaning effectiveness and preventing excessive pressure from damaging the surface of the detection head 105. The extension frame 311 moves directionally along the fixed base 310, which acts as a guide and limiter to ensure that the contact plate 312 is accurately positioned and moves smoothly, effectively preventing deviation or shaking during the cleaning process.

[0027] Example 3 differs from Examples 2 and 1 in that it specifically includes the following steps: S1: After the device is installed on the wastewater pool after food box production, the electric push rod 2 pushes the bottom cylinder 3 to move down as a whole, so that the bottom cylinder 3 is immersed in the wastewater pool, and the wastewater enters the interior of the bottom cylinder 3 through the water inlet below the bottom cylinder 3. S2: Wastewater passes through the outer filter screen 307, the middle filter screen 308 and the inner filter screen 309 in sequence and enters the bottom of the bottom cylinder 3, where it comes into contact with the detection head 105. At this time, the detection head 105 collects water quality parameter signals and transmits the signals to the circuit board 101, which analyzes and processes them to monitor the wastewater. S3: After the monitoring is completed, the solenoid valve 315 opens, and the electric push rod 2 pulls the bottom cylinder 3 to move upward and out of the sewage to return to its original position, so that the sewage that entered the bottom cylinder 3 flows out due to gravity. S4: Servo motor 302 drives fixed plate 303 to rotate through gear disk, so that the outer cleaning plate 304, middle cleaning plate 305 and inner cleaning plate 306 at the bottom of fixed plate 303 rotate simultaneously. While fixed plate 303 is rotating, counterweight 313 generates a large centrifugal force to pull extension frame 311 to move to the right along fixed base 310 and stick to the outer wall of detection head 105, so as to scrape and clean the outer wall of detection head 105 and remove plastic debris, mold release agent colloid and scale and other impurities attached to the surface of detection head 105. S5: The submersible pump 103 transports the purified water stored in the storage cylinder 102 to the fixed plate 303 through the pipeline, and introduces it into the hollow cavities of the outer cleaning plate 304, the middle cleaning plate 305 and the inner cleaning plate 306 through the hollow channels inside the fixed plate 303 respectively; the purified water is then sprayed out from the inside to the outside from the drain holes of the outer cleaning plate 304, the middle cleaning plate 305 and the inner cleaning plate 306, and backwashes the outer filter screen 307, the middle filter screen 308 and the inner filter screen 309. At the same time, the purified water sprayed from the drain hole on the side of the inner cleaning plate 306 washes the outer wall of the detection head 105 in all directions, thereby achieving simultaneous cleaning of the three layers of filter screens and the detection head 105. The backwashing method from the inside to the outside can wash away the impurities trapped in the filter screens, prevent the filter screens from clogging, and ensure the filtration and detection accuracy.

[0028] The above are merely preferred embodiments of the present invention. It should be noted that those skilled in the art can make several modifications and improvements without departing from the concept of the present invention, and these should also be considered within the scope of protection of the present invention. These will not affect the effectiveness of the implementation of the present invention or the practicality of the patent.

Claims

1. A water pollution monitoring instrument for food box production, comprising a top cylinder (1) and a circuit board (101), wherein the circuit board (101) is mounted on the upper part of the interior of the top cylinder (1), characterized in that, A storage cylinder (102) is fixed below the bottom of the top cylinder (1). A submersible pump (103) is installed inside the storage cylinder (102). A connecting cylinder (104) is vertically fixed in the middle of the storage cylinder (102). A detection head (105) is connected to the bottom of the circuit board (101) via a signal line. Electric push rods (2) are installed at the front, back, left and right ends of the bottom of the top cylinder (1). A bottom cylinder (3) is installed at the bottom of the push rod at the power output end of the electric push rod (2). An auxiliary component is provided inside the bottom cylinder (3).

2. The water pollution monitoring instrument for food box production according to claim 1, characterized in that, The auxiliary components consist of an adapter ring (301), a servo motor (302), a fixed plate (303), an outer cleaning plate (304), a middle cleaning plate (305), an inner cleaning plate (306), an outer filter (307), a middle filter (308), an inner filter (309), a transmission plate (30), a fixed base (310), an extension frame (311), a touch plate (312), a counterweight (313), a return spring (314), and a solenoid valve (315). An adapter ring (301) is installed in the middle of the upper surface of the bottom cylinder (3), and a servo motor (302) is installed at the front end of the upper surface of the bottom cylinder (3). A fixing plate (303) is embedded in the upper part of the bottom cylinder (3). An outer cleaning plate (304), a middle cleaning plate (305), and an inner cleaning plate (306) are installed sequentially from left to right on the bottom left side of the fixing plate (303). An outer filter screen (307), a middle filter screen (308), and an inner filter screen (309) are installed in the lower part of the bottom cylinder (3). A transmission plate (30) is installed on the upper surface of the plate (303). The front and rear ends of the bottom of the fixed plate (303) are fixed with a fixed seat (310). An extension frame (311) is embedded between the two fixed seats (310). A touch plate (312) is installed on the left side of the extension frame (311). A counterweight (313) is installed on the right side of the extension frame (311). A return spring (314) is fixedly connected to the right side of the two fixed seats (310). A solenoid valve (315) is installed at the bottom of the bottom cylinder (3).

3. The water pollution monitoring instrument for food box production according to claim 2, characterized in that, The bottom of the adapter ring (301) is embedded in the upper part of the inside of the transmission disk (30), and the outer wall of the bottom end of the adapter ring (301) is close to the upper part of the inner wall of the transmission disk (30). The discharge end of the submersible pump (103) is connected to the upper part of the inside of the transmission disk (30) through a pipe.

4. The water pollution monitoring instrument for food box production according to claim 2, characterized in that, The power output end of the servo motor (302) is rotatably connected to the fixed disk (303) through a gear disk, and the transmission disk (30) rotates horizontally on the outer wall of the adapter ring (301).

5. The water pollution monitoring instrument for food box production according to claim 2, characterized in that, The outer cleaning plate (304), the middle cleaning plate (305), and the inner cleaning plate (306) are all hollow structures. The outer cleaning plate (304), the middle cleaning plate (305), and the inner cleaning plate (306) have drainage holes at equal intervals from top to bottom at the end away from the center of the bottom cylinder (3). The inner cleaning plate (306) has side drainage holes at equal intervals from top to bottom at the end near the center of the bottom cylinder (3). The tops of the outer cleaning plate (304), the middle cleaning plate (305), and the inner cleaning plate (306) are connected to the lower interior of the transmission plate (30) through the hollow channel inside the fixed plate (303).

6. The water pollution monitoring instrument for food box production according to claim 2, characterized in that, The outer cleaning plate (304), the middle cleaning plate (305), and the inner cleaning plate (306) are respectively attached to the outer filter screen (307), the middle filter screen (308), and the inner filter screen (309) at the ends away from the center of the bottom cylinder (3).

7. The water pollution monitoring instrument for food box production according to claim 2, characterized in that, The outer filter screen (307), the middle filter screen (308), and the inner filter screen (309) are respectively made of stainless steel coarse filter screen, PP cotton filter element with a precision of 50μm, and PTFE sintered filter sheet that does not adsorb dissolved organic matter.

8. The water pollution monitoring instrument for food box production according to claim 2, characterized in that, The return spring (314) is fixedly connected between the right side of the fixed seat (310) and the extension frame (311). The extension frame (311) slides horizontally left and right in the fixed seat (310). When the extension frame (311) moves to the rightmost position, the touch plate (312) is in close contact with the outer wall of the detection head (105).

9. The water pollution monitoring instrument for food box production according to claim 2 or 3, characterized in that, The weight of the counterweight (313) is greater than the weight of the touch plate (312), and the distance between the counterweight (313) and the detection head (105) is greater than the distance between the touch plate (312) and the detection head (105).

10. The water pollution monitoring instrument for food box production according to any one of claims 1-9, characterized in that, Specifically, the following steps are included: S1: After the device is installed on the wastewater pool after food box production, the electric push rod (2) pushes the bottom cylinder (3) to move down as a whole, so that the bottom cylinder (3) is immersed in the wastewater pool and the wastewater enters the interior of the bottom cylinder (3) through the water inlet below the bottom cylinder (3); S2: Wastewater passes through the outer filter screen (307), the middle filter screen (308) and the inner filter screen (309) in sequence and enters the bottom of the bottom cylinder (3), where it comes into contact with the detection head (105). At this time, the detection head (105) collects water quality parameter signals and transmits the signals to the circuit board (101), which analyzes and processes them to monitor the wastewater. S3: After the monitoring is completed, the solenoid valve (315) opens, the electric push rod (2) pulls the bottom cylinder (3) to move upward and out of the sewage to return to its original position, so that the sewage that entered the bottom cylinder (3) flows out due to gravity. S4: The servo motor (302) drives the fixed plate (303) to rotate through the gear disk, so that the outer cleaning plate (304), middle cleaning plate (305) and inner cleaning plate (306) at the bottom of the fixed plate (303) rotate simultaneously. While the fixed plate (303) is rotating, the counterweight (313) generates a large centrifugal force to pull the extension frame (311) to move to the right along the fixed seat (310) and stick to the outer wall of the detection head (105), so as to scrape and clean the outer wall of the detection head (105) and remove plastic debris, mold release agent colloid and scale and other impurities attached to the surface of the detection head (105). S5: The submersible pump (103) transports the pure water stored in the storage cylinder (102) to the fixed plate (303) through the pipeline, and introduces it into the hollow cavity of the outer cleaning plate (304), the middle cleaning plate (305) and the inner cleaning plate (306) through the hollow channel inside the fixed plate (303); the pure water then sprays out from the inside to the outside from the drain hole of the outer cleaning plate (304), the middle cleaning plate (305) and the inner cleaning plate (306), and backwashes the outer filter screen (307), the middle filter screen (308) and the inner filter screen (309). At the same time, the pure water sprayed from the drain hole on the side of the inner cleaning plate (306) washes the outer wall of the detection head (105) in all directions, thereby realizing the synchronous cleaning of the three-layer filter screen and the detection head (105). The backwashing method from the inside to the outside can wash away the impurities trapped by the filter screen, prevent the filter screen from clogging, and ensure the filtration and detection accuracy.

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