Wastewater sampling device for constructional engineering

Abstract

The invention belongs to the technical field of wastewater monitoring, and particularly relates to a wastewater sampling device for constructional engineering, which comprises a sampling depth control mechanism, a sampling, cleaning and anti-blocking mechanism and an automatic wastewater sampling mechanism, and the automatic wastewater sampling mechanism is fixedly arranged on the sampling, cleaning and anti-blocking mechanism. An existing sampling device can only sample waste water of a single depth at a time, the sampling efficiency is low, suspended pollutants in the building waste water are prone to blocking a sampling opening of the sampling device, the sampling device breaks down, and the technical problems existing in the existing sampling device are effectively solved.

Description

Technical Field

[0001] The present invention belongs to the technical field of engineering wastewater monitoring, and specifically refers to a wastewater sampling device for construction projects. Background Art

[0002] At present, a large amount of construction wastewater is generated during the construction process. Before the wastewater is discharged, it will be purified to meet the discharge standards to avoid environmental pollution and waste of water resources. Construction wastewater often contains a large number of suspended pollutants with different densities. Therefore, it is necessary to sample and qualitatively analyze the sewage at different depths to accurately determine the pollutants and formulate a correct treatment plan. However, the existing sampling devices can only sample the wastewater at a single depth at a time, and multiple manual operations are required to complete the sampling, resulting in low efficiency. Moreover, the suspended pollutants in the construction wastewater are likely to block the sampling ports of the sampling devices, causing malfunctions of the sampling devices, and the existing sampling devices are difficult to solve this problem. Summary of the Invention

[0003] In view of the above situation, in order to overcome the defects of the prior art, the present invention provides a wastewater sampling device for construction projects, which can not only sample the wastewater at multiple depths separately at one time, but also automatically clean the sampling ports of the sampling device, effectively solving the technical problems in the above technical background.

[0004] The technical solution adopted by the present invention is as follows: The present invention provides a wastewater sampling device for construction projects, including a sampling depth control mechanism, a sampling cleaning and anti-blocking mechanism, and an automatic wastewater sampling mechanism. The sampling cleaning and anti-blocking mechanism is fixedly arranged on the sampling depth control mechanism, and the automatic wastewater sampling mechanism is fixedly arranged on the sampling cleaning and anti-blocking mechanism. The sampling depth control mechanism includes a lifting control component and a stable lifting component. The stable lifting component is fixedly arranged on the lifting control component. The sampling cleaning and anti-blocking mechanism includes a pneumatic cleaning component and a sampling control component. The pneumatic cleaning component is fixedly arranged inside the sampling control component. The automatic wastewater sampling mechanism includes an automatic sampling component and a sampling stop component. The sampling stop component is fixedly arranged at the bottom of the automatic sampling component.

[0005] Further, the lifting control component includes a fixing plate, a lifting motor, a support plate, and a worm. The lifting motor is fixedly arranged on the top of the fixing plate. The driving end of the lifting motor is fixedly provided with a driving gear. The support plates are symmetrically fixedly arranged at the bottom of the fixing plate. The worm penetrates through the support plate and is rotatably connected to the support plate. A driven gear is fixedly arranged on the end face of the worm. The driven gear meshes with the driving gear.

[0006] Furthermore, the stable lifting assembly includes a rectangular groove, a telescopic rod, a connecting block, and a wire reel. The rectangular grooves are symmetrically and fixedly arranged at the bottom of the fixed plate. The telescopic rod is fixedly arranged in the rectangular groove. The connecting block is fixedly arranged at the movable end of the telescopic rod. Both sides of the wire reel are fixedly connected to the outer wall of the rectangular groove. The rope end on the wire reel is fixedly connected to the connecting block. Tooth rings are symmetrically and fixedly arranged on the wire reel, and the tooth rings are meshed with a worm.

[0007] Furthermore, the sampling control assembly includes a rectangular cylinder, a partition board, a control motor, and a cam. The rectangular cylinder is arranged between the two connecting blocks and fixedly connected to the connecting blocks. The partition board is fixedly arranged in the rectangular cylinder. The control motor is fixedly arranged at the bottom of the partition board. The cam is fixedly arranged at the driving end of the control motor. A programmable controller is fixedly arranged at the inner top of the rectangular cylinder.

[0008] Furthermore, the pneumatic cleaning assembly includes an electric air pump, a shunt box, and an air outlet pipe. The electric air pump is fixedly arranged at the top of the partition board. The shunt box is fixedly arranged at the air outlet end of the electric air pump. The air outlet pipes are symmetrically arranged on the shunt box. The air outlet pipes penetrate through the rectangular cylinder and are fixedly connected to the rectangular cylinder.

[0009] Furthermore, the automatic sampling assembly includes a sampling box, a stress plate, a fixed rod, an L-shaped block, and a water outlet pipe. The sampling boxes are symmetrically and fixedly arranged on the rectangular cylinder and communicated with the air outlet pipes. A rectangular opening is arranged on the side wall of the sampling box. A water inlet is arranged at the bottom of the sampling box. A water level sensor is fixedly arranged at the inner top of the sampling box. The stress plate is arranged in the rectangular opening and slidably connected to the sampling box. A connecting plate is fixedly arranged on the end face of the stress plate.

[0010] Furthermore, the fixed rod is fixedly arranged at the inner top of the sampling box. A sampling spring is sleeved on the fixed rod. The sampling spring is fixedly connected to the sampling box. The elastic coefficient of the sampling spring arranged in front of the device is smaller than that of the sampling spring arranged behind the device. The L-shaped block is slidably arranged on the fixed rod and fixedly connected to the connecting plate. A blocking block is arranged at the bottom of the L-shaped block. The blocking block is attached to the inner bottom of the sampling box. The water outlet pipe penetrates through the sampling box and is fixedly connected to the sampling box.

[0011] Furthermore, the sampling stop assembly includes a square frame, a fixed column, a blocking plate, a limiting block, and a pull rod. The square frame is fixedly arranged at the bottom of the sampling box. The fixed column is fixedly arranged on the square frame. A return spring is sleeved on the fixed column. The blocking plate penetrates through the square frame and is slidably arranged on the fixed column. A cross-shaped columnar groove is arranged in the blocking plate. The limiting block is slidably arranged in the cross-shaped columnar groove and fixedly connected to the end face of the fixed column.

[0012] Furthermore, the pull rods are symmetrically arranged on the square frame, penetrate through the square frame and are slidably connected to the square frame. A clamping spring is sleeved on the pull rod, and a trapezoidal block is fixedly arranged on the end surface of the pull rod. The inclined surface of the trapezoidal block is attached to the inclined surface of the plugging plate.

[0013] With the above structure, the beneficial effects of the present invention are as follows: According to the existing sampling device, it can only sample wastewater at a single depth at a time, and multiple manual operations are required to complete the sampling, resulting in low efficiency. Moreover, the suspended pollutants in the construction wastewater are likely to block the sampling port of the sampling device, causing the sampling device to malfunction. By adopting the combined action mode of the lifting control component and the stable lifting component, the sampling depth can be accurately controlled according to the sampling requirements, and the sampling device can be ensured to sink stably in the wastewater pool; by adopting the combined action mode of the automatic sampling component and the sampling stop component, the wastewater at multiple depths can be automatically sampled separately, greatly improving the sampling efficiency; by adopting the combined action mode of the pneumatic cleaning component and the sampling control component, the inside and the sampling port of the sampling device can be automatically cleaned, effectively avoiding the problem of the sampling port being blocked by suspended pollutants. Description of the Drawings

[0014] Figure 1 It is a three-dimensional view of a wastewater sampling device for construction engineering proposed by the present invention; Figure 2 It is a cross-sectional view of a wastewater sampling device for construction engineering proposed by the present invention; Figure 3 It is a three-dimensional view of the sampling depth control mechanism of a wastewater sampling device for construction engineering proposed by the present invention; Figure 4 It is a cross-sectional view of the sampling depth control mechanism of a wastewater sampling device for construction engineering proposed by the present invention; Figure 5 It is a cross-sectional view of the sampling cleaning and anti-blocking mechanism of a wastewater sampling device for construction engineering proposed by the present invention; Figure 6 It is a three-dimensional view of the sampling cleaning and anti-blocking mechanism of a wastewater sampling device for construction engineering proposed by the present invention; Figure 7 It is a three-dimensional view of the wastewater automatic sampling mechanism of a wastewater sampling device for construction engineering proposed by the present invention; Figure 8 It is a cross-sectional view of the wastewater automatic sampling mechanism of a wastewater sampling device for construction engineering proposed by the present invention; Figure 9 It is a three-dimensional view of the sampling stop component of a wastewater sampling device for construction engineering proposed by the present invention.

[0015] Among them, 1. Sampling depth control mechanism, 2. Sampling cleaning and anti-blocking mechanism, 3. Wastewater automatic sampling mechanism, 4. Lifting control component, 5. Stable lifting component, 6. Pneumatic cleaning component, 7. Sampling control component, 8. Automatic sampling component, 9. Sampling stop component, 401. Fixed plate, 402. Lifting motor, 403. Support plate, 404. Worm, 405. Driving gear, 406. Driven gear, 501. Rectangular groove, 502. Telescopic rod, 503. Connecting block, 504. Reel, 505. Tooth ring, 701. Rectangular cylinder, 702. Partition board, 703. Control motor, 704. Cam, 705. Programmable controller, 601. Electric air pump, 602. Shunt box, 603. Air outlet pipe, 801. Sampling box, 802. Stress plate, 803. Fixed rod, 804. L-shaped block, 805. Water outlet pipe, 806. Water inlet, 807. Water level sensor, 808. Connecting plate, 809. Sampling spring, 810. Blocking block, 901. Square box, 902. Fixed column, 903. Blocking plate, 904. Limiting block, 905. Pull rod, 906. Return spring, 907. Cross-columnar groove, 908. Engaging spring, 909. Trapezoidal block.

[0016] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the present invention and do not constitute a limitation to the present invention. Detailed implementation manners

[0017] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments; based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the scope of protection of the present invention.

[0018] In the description of the present invention, it should be understood that the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", etc. indicating the orientation or position relationship are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present invention.

[0019] Such as Figures 1 to 9As shown in the figure, the present invention proposes a waste water sampling device for construction engineering, including a sampling depth control mechanism 1, a sampling cleaning and anti-blocking mechanism 2, and a waste water automatic sampling mechanism 3. The sampling cleaning and anti-blocking mechanism 2 is fixedly arranged on the sampling depth control mechanism 1, and the waste water automatic sampling mechanism 3 is fixedly arranged on the sampling cleaning and anti-blocking mechanism 2. The sampling depth control mechanism 1 includes a lifting control component 4 and a stable lifting component 5. The stable lifting component 5 is fixedly arranged on the lifting control component 4. The sampling cleaning and anti-blocking mechanism 2 includes a pneumatic cleaning component 6 and a sampling control component 7. The pneumatic cleaning component 6 is fixedly arranged inside the sampling control component 7. The waste water automatic sampling mechanism 3 includes an automatic sampling component 8 and a sampling stop component 9. The sampling stop component 9 is fixedly arranged at the bottom of the automatic sampling component 8.

[0020] The lifting control component 4 includes a fixing plate 401, a lifting motor 402, a support plate 403, and a worm 404. The lifting motor 402 is fixedly arranged on the top of the fixing plate 401. A driving gear 405 is fixedly arranged at the driving end of the lifting motor 402. The support plates 403 are symmetrically fixedly arranged at the bottom of the fixing plate 401. The worm 404 penetrates through the support plate 403 and is rotatably connected to the support plate 403. A driven gear 406 is fixedly arranged on the end face of the worm 404. The driven gear 406 meshes with the driving gear 405.

[0021] The stable lifting component 5 includes a rectangular groove 501, a telescopic rod 502, a connecting block 503, and a wire reel 504. The rectangular grooves 501 are symmetrically fixedly arranged at the bottom of the fixing plate 401. The telescopic rod 502 is fixedly arranged inside the rectangular groove 501. The connecting block 503 is fixedly arranged at the movable end of the telescopic rod 502. The two sides of the wire reel 504 are fixedly connected to the outer wall of the rectangular groove 501. The rope end on the wire reel 504 is fixedly connected to the connecting block 503. Tooth rings 505 are symmetrically fixedly arranged on the wire reel 504. The tooth rings 505 mesh with the worm 404.

[0022] The sampling control component 7 includes a rectangular cylinder 701, a partition plate 702, a control motor 703, and a cam 704. The rectangular cylinder 701 is arranged between the two connecting blocks 503 and is fixedly connected to the connecting blocks 503. The partition plate 702 is fixedly arranged inside the rectangular cylinder 701. The control motor 703 is fixedly arranged at the bottom of the partition plate 702. The cam 704 is fixedly arranged at the driving end of the control motor 703. A programmable controller 705 is fixedly arranged at the inner top of the rectangular cylinder 701.

[0023] The pneumatic cleaning assembly 6 includes an electric air pump 601, a shunt box 602 and an air outlet pipe 603. The electric air pump 601 is fixedly arranged on the top of the partition plate 702. The shunt box 602 is fixedly arranged on the air outlet end of the electric air pump 601. The air outlet pipes 603 are symmetrically arranged on the shunt box 602. The air outlet pipes 603 penetrate through the rectangular cylinder 701 and are fixedly connected to the rectangular cylinder 701.

[0024] The automatic sampling assembly 8 includes a sampling box 801, a stress plate 802, a fixing rod 803, an L-shaped block 804 and a water outlet pipe 805. The sampling boxes 801 are symmetrically and fixedly arranged on the rectangular cylinder 701 and are communicated with the air outlet pipes 603. A rectangular opening is arranged on the side wall of the sampling box 801. A water inlet 806 is arranged at the bottom of the sampling box 801. A water level sensor 807 is fixedly arranged at the inner top of the sampling box 801. The stress plate 802 is arranged in the rectangular opening and is slidably connected to the sampling box 801. A connecting plate 808 is fixedly arranged on the end face of the stress plate 802.

[0025] The fixing rod 803 is fixedly arranged at the inner top of the sampling box 801. A sampling spring 809 is sleeved on the fixing rod 803. The sampling spring 809 is fixedly connected to the sampling box 801. The L-shaped block 804 is slidably arranged on the fixing rod 803 and is fixedly connected to the connecting plate 808. A blocking block 810 is arranged at the bottom of the L-shaped block 804. The blocking block 810 is attached to the inner bottom of the sampling box 801. The water outlet pipe 805 penetrates through the sampling box 801 and is fixedly connected to the sampling box 801.

[0026] The sampling stop assembly 9 includes a square box 901, a fixing column 902, a blocking plate 903, a limiting block 904 and a pull rod 905. The square box 901 is fixedly arranged at the bottom of the sampling box 801. The fixing column 902 is fixedly arranged on the square box 901. A return spring 906 is sleeved on the fixing column 902. The blocking plate 903 penetrates through the square box 901 and is slidably arranged on the fixing column 902. A cross-shaped columnar groove 907 is arranged in the blocking plate 903. The limiting block 904 is slidably arranged in the cross-shaped columnar groove 907 and is fixedly connected to the end face of the fixing column 902.

[0027] The pull rods 905 are symmetrically arranged on the square box 901. The pull rods 905 penetrate through the square box 901 and are slidably connected to the square box 901. A clamping spring 908 is sleeved on the pull rods 905. A trapezoidal block 909 is fixedly arranged on the end face of the pull rods 905. The inclined surface of the trapezoidal block 909 is attached to the inclined surface of the blocking plate 903.

[0028] During specific use, first fix the sampling device at the top of the inner wall of the wastewater tank, and then start the lifting motor 402. The lifting motor 402 drives the rotation of the driving gear 405. The driving gear 405 drives the rotation of the driven gear 406 and the worm 404. The worm 404 drives the rotation of the toothed ring 505 and the wire reel 504, so that the wire reel 504 releases the rope downward. As the rope is released, the sampling cleaning and anti-blocking mechanism 2 and the automatic wastewater sampling mechanism 3 drive the connecting block 503 to descend together under their own gravity. The connecting block 503 drives the telescopic rod 502 to extend downward. After the automatic wastewater sampling mechanism 3 descends to a certain depth in the wastewater tank, when the water pressure received by the force-bearing plate 802 in the automatic wastewater sampling mechanism 3 located in front of the device is greater than the elastic force of the sampling spring 809 inside it, the force-bearing plate 802 moves upward. The force-bearing plate 802 drives the connecting plate 808 to move upward. The connecting plate 808 drives the L-shaped block 804 and the blocking block 810 to move upward together. At this time, the wastewater at the current depth can gradually flow into the sampling box 801 through the cross-shaped columnar groove 907 and the water inlet 806. When the water level sensor 807 detects that the sampling is sufficient, the water level sensor 807 transmits a signal to the programmable controller 705. The programmable controller 705 commands the control motor 703 to drive the cam 704 to rotate counterclockwise by 90 degrees and then reset. The cam 704 pushes the blocking plate 903 to move forward along the fixed column 902. The return spring 906 is stressed and contracts. The blocking plate 903 pushes the trapezoidal blocks 909 and the pull rods 905 on both sides to move outward together. The engaging spring 908 is stressed and contracts. After the blocking plate 903 moves forward a short distance, at this time, the trapezoidal block 909 just snaps into the triangular groove of the blocking plate 903 under the elastic force of the engaging spring 908. At this time, the position of the trapezoidal plate is fixed, and the cross-shaped columnar groove 907 inside the trapezoidal plate is no longer connected to the water inlet 806 and blocks the water inlet 806 below the water inlet 806, and the sampling can be stopped; after continuing to descend a certain depth, the automatic wastewater sampling mechanism 3 located behind the device will sample as described above. After the sampling is sufficient, the water level sensor 807 transmits a signal to the programmable controller 705. The programmable controller 705 commands the control motor 703 to drive the cam 704 to rotate clockwise by 90 degrees and then reset. The blocking plate 903 will also block the water inlet 806 as described above, and the sampling can be completed; after the sampling is completed, start the lifting motor 402 and rotate it in the reverse direction, and the entire sampling cleaning and anti-blocking mechanism 2 and the automatic wastewater sampling mechanism 3 can be retracted again. Subsequently, unscrew the cap on the water outlet pipe 805, and the wastewater sample can flow out from the inside.

[0029] When it is necessary to clean the inside of the automatic wastewater sampling mechanism 3 and the water inlet 806, only need to push the force-bearing plate 802 upward first, then the plugging block 810 can be lifted upward as described above. Then start the electric air pump 601. The electric air pump 601 generates high-pressure gas into the shunt box 602. The high-pressure gas flows into the sampling box 801 from the air outlet pipe 603, dries the inside of the sampling box 801, and then blows out through the water inlet 806, so as to blow out the dirt in the water inlet 806 and prevent the water inlet 806 from being blocked, affecting the sampling of the device.

[0030] It should be noted that in this article, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the term "comprising", "including" or any other variant thereof is intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements not only includes those elements, but also includes other elements not expressly listed, or also includes elements inherent to such process, method, article or device.

[0031] The above describes the present invention and its implementation manners. Such description is not restrictive. What is shown in the drawings is only one of the implementation manners of the present invention, and the actual structure is not limited thereto. All in all, if those of ordinary skill in the art are inspired by it and design similar structural manners and embodiments without creative efforts without departing from the spirit of the present invention, they shall fall within the protection scope of the present invention.

Claims

1. A wastewater sampling device for construction engineering, characterized in that: It includes a sampling depth control mechanism (1), a sampling cleaning and anti-blocking mechanism (2), and a waste water automatic sampling mechanism (3). The sampling cleaning and anti-blocking mechanism (2) is fixedly arranged on the sampling depth control mechanism (1), and the waste water automatic sampling mechanism (3) is fixedly arranged on the sampling cleaning and anti-blocking mechanism (2). The sampling depth control mechanism (1) includes a lifting control component (4) and a stable lifting component (5), and the stable lifting component (5) is fixedly arranged on the lifting control component (4). The sampling cleaning and anti-blocking mechanism (2) includes a pneumatic cleaning component (6) and a sampling control component (7), and the pneumatic cleaning component (6) is fixedly arranged inside the sampling control component (7). The waste water automatic sampling mechanism (3) includes an automatic sampling component (8) and a sampling stop component (9), and the sampling stop component (9) is fixedly arranged at the bottom of the automatic sampling component (8).

2. The wastewater sampling device for construction engineering according to claim 1, wherein: The lifting control component (4) includes a fixing plate (401), a lifting motor (402), a support plate (403), and a worm (404). The lifting motor (402) is fixedly arranged on the top of the fixing plate (401), and a driving gear (405) is fixedly arranged at the transmission end of the lifting motor (402). The support plates (403) are symmetrically and fixedly arranged at the bottom of the fixing plate (401). The worm (404) penetrates through the support plate (403) and is rotatably connected to the support plate (403). A driven gear (406) is fixedly arranged on the end face of the worm (404), and the driven gear (406) meshes with the driving gear (405).

3. The wastewater sampling device for construction engineering according to claim 2, wherein: The stable lifting component (5) includes a rectangular groove (501), a telescopic rod (502), a connecting block (503), and a wire reel (504). The rectangular grooves (501) are symmetrically and fixedly arranged at the bottom of the fixing plate (401). The telescopic rod (502) is fixedly arranged inside the rectangular groove (501). The connecting block (503) is fixedly arranged at the movable end of the telescopic rod (502). The two sides of the wire reel (504) are fixedly connected to the outer wall of the rectangular groove (501). The rope end on the wire reel (504) is fixedly connected to the connecting block (503). Tooth rings (505) are symmetrically and fixedly arranged on the wire reel (504), and the tooth rings (505) mesh with the worm (404).

4. The wastewater sampling device for construction engineering according to claim 3, characterized in that: The sampling control component (7) includes a rectangular cylinder (701), a partition plate (702), a control motor (703), and a cam (704). The rectangular cylinder (701) is arranged between the two connecting blocks (503) and is fixedly connected to the connecting blocks (503). The partition plate (702) is fixedly arranged inside the rectangular cylinder (701). The control motor (703) is fixedly arranged at the bottom of the partition plate (702). The cam (704) is fixedly arranged at the transmission end of the control motor (703). A programmable controller (705) is fixedly arranged at the inner top of the rectangular cylinder (701).

5. The wastewater sampling device for construction engineering according to claim 4, characterized in that: The pneumatic cleaning assembly (6) includes an electric air pump (601), a shunt box (602), and an air outlet pipe (603). The electric air pump (601) is fixedly arranged on the top of the partition plate (702). The shunt box (602) is fixedly arranged on the air outlet end of the electric air pump (601). The air outlet pipes (603) are symmetrically arranged on the shunt box (602), and the air outlet pipes (603) penetrate through the rectangular cylinder (701) and are fixedly connected to the rectangular cylinder (701).

6. The waste water sampling device for construction engineering according to claim 5, characterized in that: The automatic sampling assembly (8) includes a sampling box (801), a force-bearing plate (802), a fixing rod (803), an L-shaped block (804), and a water outlet pipe (805). The sampling boxes (801) are symmetrically and fixedly arranged on the rectangular cylinder (701) and are communicated with the air outlet pipe (603). A rectangular opening is provided on the side wall of the sampling box (801). A water inlet (806) is provided at the bottom of the sampling box (801). A water level sensor (807) is fixedly arranged at the inner top of the sampling box (801). The force-bearing plate (802) is arranged in the rectangular opening and is slidably connected to the sampling box (801). A connecting plate (808) is fixedly arranged on the end face of the force-bearing plate (802).

7. The wastewater sampling device for construction engineering according to claim 6, wherein: The fixing rod (803) is fixedly arranged at the inner top of the sampling box (801). A sampling spring (809) is sleeved on the fixing rod (803), and the sampling spring (809) is fixedly connected to the sampling box (801). The L-shaped block (804) is slidably arranged on the fixing rod (803) and is fixedly connected to the connecting plate (808). A blocking block (810) is provided at the bottom of the L-shaped block (804), and the blocking block (810) is in contact with the inner bottom of the sampling box (801). The water outlet pipe (805) penetrates through the sampling box (801) and is fixedly connected to the sampling box (801).

8. The waste water sampling device for construction engineering according to claim 7, wherein: The sampling stop assembly (9) includes a square box (901), a fixing column (902), a blocking plate (903), a limiting block (904), and a pull rod (905). The square box (901) is fixedly arranged at the bottom of the sampling box (801). The fixing column (902) is fixedly arranged on the square box (901). A return spring (906) is sleeved on the fixing column (902). The blocking plate (903) penetrates through the square box (901) and is slidably arranged on the fixing column (902). A cross-shaped columnar groove (907) is provided in the blocking plate (903). The limiting block (904) is slidably arranged in the cross-shaped columnar groove (907) and is fixedly connected to the end face of the fixing column (902).

9. The wastewater sampling device for construction engineering according to claim 8, characterized in that: The pull rods (905) are symmetrically arranged on the square box (901). The pull rods (905) penetrate through the square box (901) and are slidably connected to the square box (901). A clamping spring (908) is sleeved on the pull rods (905). A trapezoidal block (909) is fixedly arranged on the end face of the pull rod (905), and the inclined surface of the trapezoidal block (909) is in contact with the inclined surface of the blocking plate (903).

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