Wastewater sampling device for constructional engineering

Abstract

The invention discloses a wastewater sampling device for constructional engineering, and relates to the field of engineering wastewater monitoring, the wastewater sampling device comprises a support frame and a driving mechanism, an annular plate is arranged below the support frame, a cross-shaped plate is fixed on the outer wall of the annular plate, four end parts of the cross-shaped plate are respectively provided with a hole for placing a sealing tank, a PH sensor is arranged on a support leg on one side of the support frame, and the PH sensor is connected with the driving mechanism. The bottom openings of the four sealing tanks are all provided with sampling barrels, and the four sampling barrels are respectively made of a polytetrafluoroethylene material, a brown glass material, a high-density polyethylene material and a common polyethylene material and are adaptive to highly corrosive wastewater, organic matter and oil wastewater, heavy metal wastewater and conventional neutral wastewater; the sampling barrels made of four special materials cover mainstream wastewater scenes of constructional engineering, the limitation that a single material is adaptive to various types of wastewater is avoided, the sampling barrels made of corresponding materials can be switched to sampling stations according to the basic types of the wastewater, the materials of the sampling barrels are ensured to be completely matched with the types of the wastewater, and detection data can truly reflect wastewater components.

Description

Technical Field

[0001] This invention relates to the technical field of engineering wastewater monitoring, specifically to a wastewater sampling device for construction engineering. Background Technology

[0002] During the construction process, various types of wastewater are generated, such as acidic wastewater from foundation pit dewatering, highly alkaline wastewater from concrete curing, oily wastewater from machinery maintenance, heavy metal wastewater from steel structure rust removal, and neutral sewage from the daily lives of construction site personnel. These wastewaters need to be accurately sampled and tested to provide data support for wastewater treatment plan formulation, discharge compliance assessment, and environmental impact assessment acceptance. Therefore, wastewater sampling in construction projects is one of the core aspects of environmental management.

[0003] A wastewater sampling device for construction engineering (CN120232685A) described in the prior art includes a sampling depth control mechanism, a sampling cleaning and anti-clogging mechanism, and an automatic wastewater sampling mechanism. The sampling cleaning and anti-clogging mechanism is fixedly mounted on the sampling depth control mechanism, and the automatic wastewater sampling mechanism is fixedly mounted on the sampling cleaning and anti-clogging mechanism.

[0004] While the aforementioned technologies can precisely control the sampling depth according to sampling requirements and ensure that the sampling device sinks stably in the wastewater pool, and can automatically sample wastewater at multiple depths, construction wastewater is complex in type (such as highly corrosive, oily, heavy metals, and conventionally neutral). Therefore, it is necessary to use samplers of different materials for wastewater sampling. Otherwise, material corrosion (plasticizer leaching from plastics) or adsorption (polyethylene adsorbing oil) can easily lead to deviations in the test data (such as oil content being 15%-30% lower and heavy metal content being higher), failing to reflect the true composition of the wastewater. Summary of the Invention

[0005] Therefore, the purpose of this invention is to provide a wastewater sampling device for construction projects to solve the technical problems mentioned in the background art.

[0006] To achieve the above objectives, the present invention provides the following technical solution: A wastewater sampling device for construction projects includes a support frame and a drive mechanism. A ring plate is located below the support frame, and a cross-shaped plate is fixed to the outer wall of the ring plate. Holes for placing sealed containers are opened at each of the four ends of the cross-shaped plate. A pH sensor is installed on one leg of the support frame. A connecting pipe is fixed to the upper surface of the ring plate, and the top end of the connecting pipe is inserted into the top wall of the support frame and rotatably connected. Sampling cylinders are provided at the bottom openings of the four sealed containers. The four sampling cylinders are made of polytetrafluoroethylene, brown glass, high-density polyethylene, and ordinary polyethylene, respectively, and are suitable for highly corrosive, organic and oily, heavy metal, and conventional neutral wastewater. A bottom block is snapped into the bottom of each of the four sampling cylinders, and the upper surface of each bottom block contacts the bottom opening of the corresponding sealed container. The driving mechanism consists of an adjustment component and a connecting component. The adjustment component is mounted on a support frame and consists of a switching structure and a lifting structure. It is used to control the precise rotation of the cross-shaped plate according to the type of wastewater being detected to complete the switching of the corresponding sampling cylinder and to rigidly connect the sampling cylinder to meet the lifting requirements. The lower surfaces of the four ends of the cross-shaped plate are fixed with arc-shaped side plates on both sides of the sealed tank. The connecting component is set in the bottom block and is used to fix the sampling cylinder to the arc-shaped side plates when it is not in use. It also cooperates with the lifting structure to unlock the fixing of the sampling cylinder when it is rigidly connected.

[0007] Specifically, in this technical solution, the switching mechanism includes a drive motor, the lifting mechanism includes a vertical plate with two curved surfaces, the drive motor is fixed to one side of the top of the support frame by screws, the output end of the drive motor passes through the top wall of the support frame and the outer wall is fixedly fitted with a drive gear, the outer wall of the connecting pipe is fixedly fitted with a driven gear ring, and the drive gear meshes with the tooth surface of the driven gear ring.

[0008] Specifically, the support frame has a through hole in the center of its top wall, and the wall of the through hole has a movable groove that matches the edge of the top of the connecting pipe. The vertical plate is located in the through hole and the connecting pipe. An L-shaped movable plate is welded to the bottom of the vertical plate. The bottom of the movable plate is symmetrically fixed with plug-in blocks on the outer wall away from the drive gear. A rack is fixed to the bottom of the end face of each of the two plug-in blocks.

[0009] Specifically, in this technical solution, a frame body is fixed to the top wall of the support frame above the perforation. A sliding groove is provided on the top wall of the frame body, and an I-shaped slider is slidably installed in the sliding groove. A second electric telescopic cylinder is fixed to the top of the slider by screws. The telescopic end of the second electric telescopic cylinder passes through the slider and is fixedly connected to the top of the vertical plate. A sleeve block is fitted on the outer side of the top of the vertical plate. A third electric telescopic cylinder is fixed to the side wall of the frame body away from the drive motor by screws. The output end of the third electric telescopic cylinder passes through the side wall of the frame body and is fixed to the sleeve block by screws.

[0010] Specifically, in this technical solution, each of the bottom blocks has a movable cavity, and each of the bottom blocks has a corresponding insertion hole on the side near the insertion block. The insertion hole is perpendicular to and communicates with the movable cavity, and the cavity wall of the movable cavity away from the insertion hole has an extension hole. The connecting assembly includes a bidirectional threaded rod and a fixing plate. The bidirectional threaded rod is horizontally arranged in the movable cavity. The fixing plate is fixedly sleeved in the middle of the bidirectional threaded rod. The top and bottom walls of the fixing plate are fixedly connected to the cavity wall of the movable cavity. Limiting blocks are threaded on both ends of the bidirectional threaded rod. Spur gears are fixed on both sides of the outer wall of the bidirectional threaded rod located on both sides of the fixing plate. The two insertion blocks are matched with insertion holes. The tooth surfaces of the two racks are matched with the lower tooth surfaces of the spur gears. The ends of the two racks away from the insertion blocks are matched with extension holes.

[0011] Specifically, in this technical solution, the ends of both limiting blocks extend out of the wall of the bottom block to the outside, and each of the arc-shaped side plates has a limiting hole at its bottom. The ends of both limiting blocks are inserted into the limiting holes. A limiting plate is welded to the lower surface of one end of the two limiting blocks in the movable cavity, and the bottom ends of the two limiting plates are slidably connected to the bottom wall of the movable cavity.

[0012] Specifically, in this technical solution, four L-shaped locking blocks are fixed at the bottom of the outer peripheral wall of each sampling tube, and a placement groove is opened on the upper surface of each bottom block. The bottom end of the sampling tube is inserted into the placement groove. Grooves are evenly opened on the bottom block at the placement groove. A locking slot is opened on one side wall of each groove. The four L-shaped locking blocks are respectively located in the corresponding grooves and are inserted into the locking slots.

[0013] Specifically, in this technical solution, a telescopic rod is installed at the center of the inner top wall of each sealed container by screws, and a sealing cap is fixed at the telescopic end of each telescopic rod. The lower surface of each sealing cap is in contact with the top of the sampling tube, and a magnet is embedded in the top of each sampling tube and is magnetically attracted to the sealing cap.

[0014] Specifically, each of the sealed containers has ear plates symmetrically fixed to the top of its outer wall. Each ear plate is fixedly connected to a cross-shaped plate by screws. Each sealed container has a chamber for storing ice cubes in its wall, and a sealing plug is installed at the top of each sealed container in the chamber.

[0015] Specifically, in this technical solution, the top of the pH sensor is provided with a mounting plate, one side of which is fixed to the support leg screw of the support frame, and the top of the mounting plate is fixed with a first electric telescopic cylinder by screws. The telescopic end of the first electric telescopic cylinder passes through the mounting plate and is snapped to the top of the pH sensor.

[0016] In summary, the present invention has the following advantages: by using sampling tubes made of four special materials to cover the mainstream wastewater scenarios in construction engineering, it avoids the limitation of a single material being suitable for multiple types of wastewater. Furthermore, by automatically determining the basic type of wastewater through a pH sensor, and then switching the corresponding material sampling tube to the sampling station through the switching structure of the adjustment component, it ensures that the sampling tube material is completely matched with the wastewater type, and the test data can accurately reflect the wastewater composition, providing a reliable basis for subsequent wastewater treatment scheme formulation and environmental impact assessment acceptance. Furthermore, through coordinated operation with the connecting components, the sampling cylinder achieves automated connection between non-working fixation, working unlocking, and post-sampling reset. That is, when the sampling cylinder switches to the sampling position, the lifting structure ensures the stability of the sampling process through rigid connection, avoiding sampling errors caused by shaking or displacement. At the same time, the connecting components are fixed to the arc-shaped side plate when the sampling cylinder is not in use, effectively preventing accidental movement or collision during non-sampling stages, further ensuring the safety of the equipment and the sampling accuracy.

[0017] In addition, the sealed container's chamber design allows for the storage of ice, enabling immediate low-temperature preservation of samples after sampling. This prevents microbial activity or chemical changes in the wastewater from affecting test results, ensuring the reliability of data throughout the entire process from sampling to testing. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the sampling device of the present invention from the positive axis side. Figure 2 This is a schematic diagram of the main structure of the sampling device of the present invention; Figure 3 This is a schematic diagram showing the connection between the support frame and the cross-shaped plate of the present invention; Figure 4 This is a schematic diagram of the vertical plate and the movable plate structure of the present invention; Figure 5 This is a schematic diagram of the cross-shaped plate and the sealed container structure of the present invention; Figure 6 This is a schematic diagram showing the disassembled sealing container and sampling tube of the present invention; Figure 7 This is a schematic diagram of the cross-sectional structure of the sealing can of the present invention; Figure 8 This is a schematic diagram of the cross-sectional structure of the bottom block of the present invention; Figure 9 For the present invention Figure 8 Side view structural diagram.

[0019] Figure Descriptions: 1. Support frame; 101. Perforation; 102. Mounting plate; 1021. pH sensor; 1022. First electric telescopic cylinder; 103. Frame body; 1031. Slide groove; 2. Ring plate; 201. Connecting pipe; 202. Cross-shaped plate; 2021. Hole; 203. Arc-shaped side plate; 2031. Limiting hole; 3. Sealing tank; 301. Chamber; 302. Sealing plug; 303. Ear plate; 304. Telescopic rod; 3041. Sealing cover; 4. Sampling cylinder; 401. L-shaped locking block; 5. Drive mechanism; 6. Adjustment assembly; 601 602. Vertical plate; 6023. Moving plate; 6024. Insertion block; 6025. Rack; 606. Slider; 607. Second electric telescopic cylinder; 608. Sleeve block; 609. Third electric telescopic cylinder; 6000. Drive motor; 6001. Drive gear; 6002. Driven gear ring; 701. Connecting assembly; 702. Fixed plate; 703. Double-sided threaded rod; 704. Spur gear; 705. Limiting block; 706. Limiting plate; 807. Bottom block; 801. Placement slot; 8012. Groove; 8013. Slot; 804. Movable cavity; 805. Insertion hole. Detailed Implementation

[0020] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and should not be construed as limiting the present invention.

[0021] The embodiments of the present invention will now be described.

[0022] It should be noted that a controller (not shown in the figure) is also installed on one side of the top of the support frame 1. The controller is controlled by electrical components via wires, and the controller determines the type of wastewater based on a preset threshold. When pH < 2, it is determined to be highly corrosive wastewater, corresponding to sampling tube 4 made of polytetrafluoroethylene. When pH > 12, it is determined to be strongly alkaline wastewater (classified as highly corrosive), corresponding to sampling tube 4 made of polytetrafluoroethylene; When an oil film is detected or oil is determined to be present by an auxiliary oil separation sensor (optional): the corresponding brown glass sampling cylinder 4; pH 6-9 and conductivity > 5000 μS / cm (determined by auxiliary conductivity sensor): corresponding to high-density polyethylene sampling cylinder 4; pH 6-9 and conductivity ≤ 5000 μS / cm: judged as conventional neutral wastewater, corresponding to ordinary polyethylene sampling tube 4; Furthermore, the four different sampling tubes 4 are pre-coded in the controller to facilitate switching according to the type of wastewater.

[0023] In this embodiment, please refer to Figures 1-8 As shown, a wastewater sampling device for construction engineering includes a support frame 1 and a drive mechanism 5. A ring plate 2 is provided below the support frame 1. A cross-shaped plate 202 is fixed to the outer ring wall of the ring plate 2. Holes 2021 for placing sealed canisters 3 are opened at the four ends of the cross-shaped plate 202. Ear plates 303 are symmetrically fixed to the top of the outer wall of each sealed canister 3. Each ear plate 303 is fixedly connected to the cross-shaped plate 202 by screws. A chamber 301 for storing ice is opened in the canister wall of each sealed canister 3. A sealing plug 302 is installed at the top of each sealed canister 3 in the chamber 301. A pH sensor 1021 is mounted on one of the support legs of the support frame 1. A mounting plate 102 is located on the top of the pH sensor 1021. One side of the mounting plate 102 is screwed to the support leg of the support frame 1. A first electric telescopic cylinder 1022 is fixed to the top of the mounting plate 102 by screws. The telescopic end of the first electric telescopic cylinder 1022 passes through the mounting plate 102 and is snap-fitted to the top of the pH sensor 1021. A connecting pipe 201 is fixed to the upper surface of the ring plate 2. The top of the connecting pipe 201 is inserted into the top wall of the support frame 1 and is rotatably connected. The bottoms of the four sealed tanks 3 are open. Each of the four sampling cylinders 4 is equipped with a sampling tube 4. A telescopic rod 304 is installed in the center of the inner top wall of each sealed tank 3 by screws. A sealing cover 3041 is fixed to the telescopic end of each telescopic rod 304. The lower surface of each sealing cover 3041 is in contact with the top of the sampling tube 4. A magnet is embedded in the top of each sampling tube 4 and is magnetically attracted to the sealing cover 3041. The four sampling tubes 4 are made of polytetrafluoroethylene, brown glass, high-density polyethylene and ordinary polyethylene respectively, and are suitable for highly corrosive wastewater, organic and oily wastewater, heavy metal wastewater and conventional neutral wastewater. Each of the four sampling cylinders 4 has a bottom block 8 attached to its bottom. The upper surface of each bottom block 8 is in contact with the bottom opening of the corresponding sealed container 3. Four L-shaped locking blocks 401 are fixed to the bottom of the outer peripheral wall of each sampling cylinder 4. Each bottom block 8 has a placement groove 801 on its upper surface. The bottom end of the sampling cylinder 4 is inserted into the placement groove 801. Grooves 8011 are evenly distributed on the bottom block 8 at the placement groove 801. A locking slot 8012 is formed on one side wall of each groove 8011. The four L-shaped locking blocks... Block 401 is located in the corresponding groove 8011 and is connected to the slot 8012. Each bottom block 8 has a movable cavity 802. Each bottom block 8 has a corresponding insertion hole 803 on the side near the insertion block 6021. The insertion hole 803 is perpendicular to the movable cavity 802. The cavity wall of the movable cavity 802 away from the insertion hole 803 has an extension hole. The main body of the bottom block 8 is made of reinforced polytetrafluoroethylene material, and the inner wall of the movable cavity 802 is coated with polytetrafluoroethylene coating (10μm thick). The drive mechanism 5 consists of an adjustment component 6 and a connecting component 7. The adjustment component 6 is mounted on the support frame 1 and consists of a switching structure and a lifting structure. It is used to control the precise rotation of the cross-shaped plate 202 according to the type of wastewater being detected to complete the switching of the corresponding sampling cylinder 4, and to rigidly connect the sampling cylinder 4 to meet the lifting requirements. The lower surfaces of the four ends of the cross-shaped plate 202 are fixed with arc-shaped side plates 203 on both sides of the sealed tank 3. The connecting component 7 is set in the bottom block 8 and is used to fix the sampling cylinder 4 to the arc-shaped side plates 203 when it is not in use. It also cooperates with the lifting structure to unlock the fixing of the sampling cylinder 4 when it is rigidly connected.

[0024] When sampling wastewater from a construction project, the staff moves the device to the edge of the wastewater pool and then activates the first electric telescopic cylinder 1022. The telescopic end of the first electric telescopic cylinder 1022 extends downward, causing the pH sensor 1021 to slowly immerse itself in the wastewater. The pH sensor 1021 collects the pH value of the wastewater in real time and transmits it to the device controller. The controller determines the type of wastewater based on a preset threshold. After identification, the telescopic end of the first electric telescopic cylinder 1022 retracts, causing the pH sensor 1021 to detach from the wastewater and return to its initial position. At this time, based on the wastewater type identification result, the controller drives the switching structure of the adjustment component 6, which drives the cross-shaped plate 202 to rotate through the connecting pipe 201 and the ring plate 2, switching the sampling cylinder 4 of the corresponding material to the lifting structure where the insertion block 6021 is located. During the rotation of the cross-shaped plate 202, the controller monitors the rotation angle of the cross-shaped plate 202 in real time through the photoelectric positioning sensor (not shown) installed under the top wall of the support frame 1. After switching to the position, the lifting structure operates, first controlling the insertion block 6021 to move laterally and insert into the insertion hole 803 of the bottom block 8. During the insertion process, the connecting component 7 is driven by the rack 6022 to continue to advance the insertion block 6021 until the end of the insertion block 6021 away from the rack 6022 is inserted into the extension hole of the movable cavity 802 away from the insertion hole 803, so that the sampling cylinder 4 is no longer fixed to the arc-shaped side plates 203 on both sides (the limit block 704 is retracted). At this time, the lifting structure and the bottom block 8 form a rigid connection. Next, according to the sampling requirements, the sampling depth is set on the controller. The bottom block 8 connected to the lifting structure moves down, and the bottom block 8 drives the sampling cylinder 4 to move down. When the sampling cylinder 4 moves down, due to the attraction of the magnet, the sealing cover 3041 will move down synchronously with the sampling cylinder 4 and stretch the telescopic rod 304. When the telescopic rod 304 reaches its maximum stroke (preset to be 1.2 times the sinking depth of the sampling cylinder 4), the pulling force of the telescopic rod 304 overcomes the attraction of the magnet, and the sealing cover 3041 separates from the top opening of the sampling cylinder 4. Wastewater enters the cylinder through the top opening of the sampling cylinder 4. After sampling is completed, the lifting structure drives the sampling cylinder 4 to rise. When the top is close to the sealing cover 3041, the magnet re-attracts the sealing cover 3041 and pushes the telescopic rod 304 to retract, thus achieving the initial sealing of the sampling cylinder 4. After the sampling cylinder 4 rises to the initial position (the top of the bottom block 8 fits against the bottom opening of the sealed container 3), the insertion block 6021 and the rack 6022 reset, and the drive connection assembly 7 resets (the limiting block 704 is reinserted into the limiting hole 2031 of the arc-shaped side plate 203). The sealed container 3 performs a secondary seal on the sampling cylinder 4, and the temperature is maintained at 0-4℃ by the ice blocks stored in the chamber 301, providing a low-temperature loop for sample preservation. Finally, when taking out the sampling cylinder 4, the rigid connection described above is repeated to control the sampling cylinder 4 to move out of the sealed container 3. Then, the sampling cylinder 4 is rotated counterclockwise to disengage the L-shaped locking block 401 from the locking groove 8012, and the fixation is canceled. The sampling cylinder 4 can then be taken out upwards to test the wastewater sample inside. This ensures that the materials of the four sampling tubes 4 match the corresponding wastewater types, and that the test data accurately reflects the wastewater composition, providing a reliable basis for subsequent wastewater treatment plan formulation and environmental impact assessment acceptance. Furthermore, through the coordinated operation of the drive mechanism 5, the non-working fixation, working unlocking, and post-sampling reset of the sampling tubes 4 are automatically connected. In addition, the samples are immediately stored at low temperature after sampling to prevent microbial activity or chemical changes in the wastewater from affecting the test results, ensuring the reliability of data throughout the entire process from sampling to testing.

[0025] Please see Figure 3 , Figure 4 , Figure 8 and Figure 9As shown, the switching structure includes a drive motor 607, and the lifting structure includes a vertical plate 601 with two curved surfaces. The drive motor 607 is fixed to one side of the top of the support frame 1 by screws. The output end of the drive motor 607 passes through the top wall of the support frame 1 and the outer wall is fixedly fitted with a drive gear 6071. The outer wall of the connecting pipe 201 is fixedly fitted with a driven gear ring 608. The drive gear 6071 and the driven gear ring 608 are meshed. A through hole 101 is opened in the center of the top wall of the support frame 1. The hole wall of the through hole 101 is opened with a movable groove that matches the extension of the top of the connecting pipe 201. The vertical plate 601 is located in the through hole 101 and the connecting pipe 201. An L-shaped movable plate 602 is welded to the bottom of the vertical plate 601. The bottom of the movable plate 602 away from the drive gear 6071 is symmetrically fixed with plug blocks 6021. The bottom of the end face of the two plug blocks 6021 is fixed with racks 6022. The top wall of the support frame 1 is fixed with a frame body 103 above the through hole 101. The top wall of the frame body 103 is provided with a sliding groove 1031. An I-shaped slider 603 is slidably installed in the sliding groove 1031. The top of the slider 603 is fixed with a second electric telescopic cylinder 604 by screws. The telescopic end of the second electric telescopic cylinder 604 passes through the slider 603 and is fixedly connected to the top of the vertical plate 601. A sleeve block 605 is sleeved on the outer side of the top of the vertical plate 601. The side wall of the frame body 103 away from the drive motor 607 is fixed with a third electric telescopic cylinder 606 by screws. The output end of the third electric telescopic cylinder 606 passes through the side wall of the frame body 103 and is fixed with the sleeve block 605 by screws. The connecting assembly 7 includes a bidirectional threaded rod 702 and a fixing plate 701. The bidirectional threaded rod 702 is horizontally positioned in the movable cavity 802. The surface of the bidirectional threaded rod 702 is nitrided (nitriding layer depth 0.15mm) to ensure no material corrosion or jamming during sampling of highly corrosive wastewater. The fixing plate 701 is fixedly sleeved in the middle of the bidirectional threaded rod 702. The top and bottom walls of the fixing plate 701 are fixedly connected to the cavity wall of the movable cavity 802. Limiting blocks 704 are threadedly sleeved at both ends of the bidirectional threaded rod 702, and spur gears 703 are fixed on both sides of the outer wall of the bidirectional threaded rod 702 on the fixing plate 701. Two plug-in blocks 6 All 021 are matched with the insertion hole 803. The tooth surfaces of the two racks 6022 are matched with the lower tooth surfaces of the spur gear 703. The ends of the two racks 6022 away from the insertion block 6021 are matched with the extension hole. The ends of the two limiting blocks 704 extend out of the wall of the bottom block 8 to the outside. Each arc-shaped side plate 203 has a limiting hole 2031 at its bottom. The ends of the two limiting blocks 704 are inserted into the limiting hole 2031. A limiting plate 7041 is welded to the lower surface of one end of the two limiting blocks 704 located in the movable cavity 802. The bottom ends of the two limiting plates 7041 are slidably connected to the bottom wall of the movable cavity 802.

[0026] When switching the sampling cylinder 4 to adapt to the wastewater type, the drive motor 607 works, and its output end drives the drive gear 6071 to rotate. The drive gear 6071 drives the driven gear ring 608 on the outer wall of the connecting pipe 201 to rotate through tooth surface meshing. The connecting pipe 201 and the ring plate 2 rotate synchronously, thereby driving the cross plate 202 to rotate until the sampling cylinder 4 of the corresponding material moves to the insertion block 6021, after which the drive motor 607 stops working. Next, the third electric telescopic cylinder 606 is activated, its telescopic end extends and drives the sleeve block 605 to move. The sleeve block 605 drives the vertical plate 601 to move from one side of the through hole 101 to the other side. The vertical plate 601 drives the moving plate 602 and the second electric telescopic cylinder 604 to move. The second electric telescopic cylinder 604 slides along the slide groove 1031 via the slider 603. The moving plate 602 drives the insertion block 6021 and the rack 6022 to insert into the insertion hole 803 opened in the bottom block 8 of the sampling cylinder 4 adapted to wastewater. As the insertion block 6021 and the rack 6022 continue to be inserted, the rack 6021... The tooth surface of rack 6022 contacts the tooth surface below the spur gear 703. The rack 6022 drives the spur gear 703 to rotate. The spur gear 703 drives the bidirectional threaded rod 702 to rotate synchronously. Since the threads at both ends of the bidirectional threaded rod 702 rotate in opposite directions, and the limiting block 704 is slidably connected to the bottom wall of the movable cavity 802 through the limiting plate 7041 (restricting rotation), when the bidirectional threaded rod 702 rotates, it drives the two limiting blocks 704 to retract into the movable cavity 802 until the end of the limiting block 704 completely disengages from the limiting hole 2031 at the bottom of the arc-shaped side plate 203, thus completing the unlocking of the sampling cylinder 4. Continue advancing the insertion block 6021 until the end of the insertion block 6021 away from the rack 6022 is inserted into the extension hole of the movable cavity 802 away from the insertion hole 803. At this time, the moving plate 602 and the bottom block 8 form a rigid connection, and the sampling cylinder 4 and the lifting mechanism (vertical plate 601 and moving plate 602) become one unit. Then, the second electric telescopic cylinder 604 is activated, and its telescopic end extends downward to drive the vertical plate 601 to slide along the inner wall of the through hole 101 and the connecting pipe 201. The sampling cylinder 4 is driven to sink through the moving plate 602 and the bottom block 8. During the descent of the vertical plate 601, the controller monitors the descent distance in real time through the encoder built into the second electric telescopic cylinder 604. When the sampling cylinder 4 sinks to the preset depth, the second electric telescopic cylinder 604 stops extending and wastewater sampling is performed.

[0027] The working principle of this invention is as follows: When sampling wastewater from a construction project, the staff moves the device to the edge of the wastewater pool and then activates the first electric telescopic cylinder 1022. The telescopic end of the first electric telescopic cylinder 1022 extends downward, causing the pH sensor 1021 to slowly immerse itself in the wastewater. The pH sensor 1021 collects the pH value of the wastewater in real time and transmits it to the device controller. The controller determines the type of wastewater based on a preset threshold. After identification, the telescopic end of the first electric telescopic cylinder 1022 retracts, causing the pH sensor 1021 to detach from the wastewater and return to its initial position. At this time, the controller starts the drive motor 607 according to the wastewater type identification result. Its output end drives the drive gear 6071 to rotate. The drive gear 6071 drives the driven gear ring 608 on the outer wall of the connecting pipe 201 to rotate through tooth surface meshing. The connecting pipe 201 and the ring plate 2 rotate synchronously, thereby driving the cross plate 202 to rotate until the sampling cylinder 4 of the corresponding material moves to the insertion block 6021, and then the drive motor 607 stops working. Next, the third electric telescopic cylinder 606 is activated, its telescopic end extends and drives the sleeve block 605 to move. The sleeve block 605 drives the vertical plate 601 to move from one side of the through hole 101 to the other side. The vertical plate 601 drives the moving plate 602 and the second electric telescopic cylinder 604 to move. The second electric telescopic cylinder 604 slides along the slide groove 1031 via the slider 603. The moving plate 602 drives the insertion block 6021 and the rack 6022 to insert into the insertion hole 803 opened in the bottom block 8 of the sampling cylinder 4 adapted to wastewater. As the insertion block 6021 and the rack 6022 continue to be inserted, the rack 6021... The tooth surface of rack 6022 contacts the tooth surface below the spur gear 703. The rack 6022 drives the spur gear 703 to rotate. The spur gear 703 drives the bidirectional threaded rod 702 to rotate synchronously. Since the threads at both ends of the bidirectional threaded rod 702 rotate in opposite directions, and the limiting block 704 is slidably connected to the bottom wall of the movable cavity 802 through the limiting plate 7041 (restricting rotation), when the bidirectional threaded rod 702 rotates, it drives the two limiting blocks 704 to retract into the movable cavity 802 until the end of the limiting block 704 completely disengages from the limiting hole 2031 at the bottom of the arc-shaped side plate 203, thus completing the unlocking of the sampling cylinder 4. Continue advancing the insertion block 6021 until the end of the insertion block 6021 away from the rack 6022 is inserted into the extension hole of the movable cavity 802 away from the insertion hole 803. At this time, the moving plate 602 and the bottom block 8 form a rigid connection, and the sampling cylinder 4 and the lifting mechanism (vertical plate 601 and moving plate 602) become one unit. Then, the second electric telescopic cylinder 604 is activated, and its telescopic end extends downward, driving the vertical plate 601 to slide along the inner wall of the through hole 101 and the connecting pipe 201. The sampling cylinder 4 is driven to sink through the moving plate 602 and the bottom block 8. During the descent of the vertical plate 601, the controller monitors the descent distance in real time through the encoder built into the second electric telescopic cylinder 604. When sampling... When the sampling cylinder 4 sinks to the preset depth, the second electric telescopic cylinder 604 stops extending. As the sampling cylinder 4 moves down, due to the attraction of the magnet, the sealing cover 3041 moves down synchronously with the sampling cylinder 4 and stretches the telescopic rod 304. When the telescopic rod 304 reaches its maximum stroke, the tension of the telescopic rod 304 overcomes the attraction of the magnet, and the sealing cover 3041 separates from the top opening of the sampling cylinder 4. Wastewater enters the cylinder through the top opening of the sampling cylinder 4. After sampling is completed, the lifting structure drives the sampling cylinder 4 to rise. When the top end approaches the sealing cover 3041, the magnet re-attracts the sealing cover 3041 and pushes the telescopic rod 304 to retract, thus achieving the initial sealing of the sampling cylinder 4. After the sampling cylinder 4 rises to the initial position, the insertion block 6021 and the rack 6022 reset, driving the limiting block 704 to re-insert into the limiting hole 2031 of the arc-shaped side plate 203. The sealing tank 3 performs a secondary seal on the sampling cylinder 4, and the temperature is maintained at 0-4℃ by the ice blocks stored in the chamber 301, providing a low-temperature environment for sample preservation. Finally, when taking out the sampling cylinder 4, the rigid connection described above is repeated to control the sampling cylinder 4 to move out of the sealing tank 3. Then, the sampling cylinder 4 is rotated counterclockwise to disengage the L-shaped locking block 401 from the locking groove 8012, canceling the fixation. The sampling cylinder 4 can then be taken out upwards to test the wastewater sample inside.

[0028] Although embodiments of the present invention have been shown and described, these specific embodiments are merely explanations of the invention and are not intended to limit it. The specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. After reading this specification, those skilled in the art may make modifications, substitutions, and variations to the embodiments as needed without departing from the principles and spirit of the invention, but such modifications, substitutions, and variations are protected by patent law as long as they are within the scope of the claims of the present invention.

Claims

1. A wastewater sampling device for construction projects, comprising a support frame (1) and a drive mechanism (5), wherein a ring plate (2) is provided below the support frame (1), and a cross-shaped plate (202) is fixed to the outer ring wall of the ring plate (2), and holes (2021) for placing a sealed container (3) are provided at the four ends of the cross-shaped plate (202), characterized in that, A pH sensor (1021) is installed on one side leg of the support frame (1). A connecting pipe (201) is fixed on the upper surface of the ring plate (2). The top end of the connecting pipe (201) is inserted into the top wall of the support frame (1) and is rotatably connected. The bottom openings of the four sealed tanks (3) are provided with sampling cylinders (4). The four sampling cylinders (4) are made of polytetrafluoroethylene, brown glass, high-density polyethylene and ordinary polyethylene respectively. They are suitable for highly corrosive, organic and oily, heavy metal and conventional neutral wastewater. The bottom of the four sampling cylinders (4) is clamped with a bottom block (8). The upper surface of the four bottom blocks (8) is in contact with the bottom opening of the corresponding sealed tank (3). The drive mechanism (5) consists of an adjustment component (6) and a connecting component (7). The adjustment component (6) is installed on the support frame (1). The adjustment component (6) consists of a switching structure and a lifting structure. It is used to control the precise rotation of the cross-shaped plate (202) according to the type of wastewater being detected to complete the switching of the corresponding sampling cylinder (4) and to rigidly connect the sampling cylinder (4) to meet the lifting requirements. The lower surfaces of the four ends of the cross-shaped plate (202) are fixed with arc-shaped side plates (203) on both sides of the sealed tank (3). The connecting component (7) is set in the bottom block (8) and is used to fix the sampling cylinder (4) with the arc-shaped side plate (203) when it is not in use. It also cooperates with the lifting structure to unlock the fixing of the sampling cylinder (4) when it is rigidly connected.

2. The wastewater sampling device for construction projects according to claim 1, characterized in that, The switching structure includes a drive motor (607), and the lifting structure includes a vertical plate (601) with two curved surfaces. The drive motor (607) is fixed to one side of the top of the support frame (1) by screws. The output end of the drive motor (607) passes through the top wall of the support frame (1) and the outer wall is fixedly fitted with a drive gear (6071). The outer wall of the connecting pipe (201) is fixedly fitted with a driven gear ring (608). The drive gear (6071) and the driven gear ring (608) mesh with each other.

3. The wastewater sampling device for construction projects according to claim 2, characterized in that, A through hole (101) is provided at the center of the top wall of the support frame (1). The hole wall of the through hole (101) is provided with a movable groove that matches the edge of the top of the connecting pipe (201). The vertical plate (601) is located in the through hole (101) and the connecting pipe (201). An L-shaped movable plate (602) is welded to the bottom of the vertical plate (601). A plug-in block (6021) is symmetrically fixed to the outer wall of the bottom of the movable plate (602) away from the drive gear (6071). A rack (6022) is fixed to the bottom of the end face of each of the two plug-in blocks (6021).

4. The wastewater sampling device for construction projects according to claim 3, characterized in that, The top wall of the support frame (1) is fixed with a frame body (103) above the perforation (101). The top wall of the frame body (103) is provided with a sliding groove (1031). An I-shaped slider (603) is slidably installed in the sliding groove (1031). The top of the slider (603) is fixed with a second electric telescopic cylinder (604) by screws. The telescopic end of the second electric telescopic cylinder (604) passes through the slider (603) and is fixedly connected to the top of the vertical plate (601). A sleeve block (605) is sleeved on the outer side of the top of the vertical plate (601). The side wall of the frame body (103) away from the drive motor (607) is fixed with a third electric telescopic cylinder (606) by screws. The output end of the third electric telescopic cylinder (606) passes through the side wall of the frame body (103) and is fixed with the sleeve block (605) by screws.

5. The wastewater sampling device for construction projects according to claim 3, characterized in that, Each of the bottom blocks (8) has a movable cavity (802), and each of the bottom blocks (8) has a corresponding insertion hole (803) on the side near the insertion block (6021). The insertion hole (803) is perpendicularly connected to the movable cavity (802), and the cavity wall of the movable cavity (802) away from the insertion hole (803) has an extension hole. The connecting assembly (7) includes a bidirectional threaded rod (702) and a fixing plate (701). The bidirectional threaded rod (702) is horizontally arranged in the movable cavity (802). The fixing plate (701) is fixedly sleeved in the middle of the bidirectional threaded rod (702). The top and bottom walls of the fixing plate (701) are fixedly connected to the cavity wall of the movable cavity (802). Limiting blocks (704) are threadedly sleeved at both ends of the bidirectional threaded rod (702). Spur gears (703) are fixed on both sides of the outer wall of the bidirectional threaded rod (702) on the fixing plate (701). The two insertion blocks (6021) are matched with the insertion holes (803). The tooth surfaces of the two racks (6022) are matched with the lower tooth surfaces of the spur gears (703). The ends of the two racks (6022) away from the insertion blocks (6021) are matched with the extension holes.

6. The wastewater sampling device for construction projects according to claim 5, characterized in that, The ends of the two limiting blocks (704) extend out of the wall of the bottom block (8) to the outside. Each arc-shaped side plate (203) has a limiting hole (2031) at its bottom. The ends of the two limiting blocks (704) are inserted into the limiting hole (2031). A limiting plate (7041) is welded to the lower surface of one end of the two limiting blocks (704) in the movable cavity (802). The bottom ends of the two limiting plates (7041) are slidably connected to the bottom wall of the movable cavity (802).

7. The wastewater sampling device for construction projects according to claim 1, characterized in that, Four L-shaped locking blocks (401) are fixed to the bottom of the outer peripheral wall of each sampling tube (4). Each bottom block (8) has a placement groove (801) on its upper surface. The bottom end of the sampling tube (4) is inserted into the placement groove (801). The bottom block (8) has a groove (8011) evenly opened at the placement groove (801). Each groove (8011) has a locking slot (8012) on one side of its groove wall. The four L-shaped locking blocks (401) are respectively located in the corresponding groove (8011) and are inserted into the locking slot (8012).

8. The wastewater sampling device for construction projects according to claim 1, characterized in that, Each of the sealed containers (3) has a telescopic rod (304) installed at the center of its inner top wall by screws. Each telescopic rod (304) has a sealing cap (3041) fixed at its telescopic end. The lower surface of each sealing cap (3041) is in contact with the top of the sampling tube (4). Each sampling tube (4) has a magnet embedded in its top end and is magnetically attracted to the sealing cap (3041).

9. The wastewater sampling device for construction projects according to claim 1, characterized in that, Each of the sealed containers (3) has a symmetrically fixed ear plate (303) on the top of its outer wall. Each ear plate (303) is fixedly connected to a cross-shaped plate (202) by screws. Each of the sealed containers (3) has a chamber (301) for storing ice cubes on its wall. Each of the sealed containers (3) has a sealing plug (302) installed at the top of the chamber (301).

10. The wastewater sampling device for construction projects according to claim 1, characterized in that, The top of the PH sensor (1021) is provided with a mounting plate (102). One side of the mounting plate (102) is fixed to the support leg screw of the support frame (1). The top of the mounting plate (102) is fixed with a first electric telescopic cylinder (1022) by screws. The telescopic end of the first electric telescopic cylinder (1022) passes through the mounting plate (102) and is snapped to the top of the PH sensor (1021).

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