A passivating agent preparation and application device for soil pollution remediation

By designing a rotating and traveling frame mechanism, combined with a power pump and a distribution pipe, the problem of uneven spraying of passivating agent was solved, achieving large-area uniform coverage, reducing resource waste and costs, and improving the ease of operation and spraying efficiency of the equipment.

CN224423808UActive Publication Date: 2026-06-30YUNNAN SHENGQING ENVIRONMENTAL MONITORING CO LTD

Patent Information

Authority / Receiving Office
CN · China
Patent Type
Utility models(China)
Current Assignee / Owner
YUNNAN SHENGQING ENVIRONMENTAL MONITORING CO LTD
Filing Date
2025-07-28
Publication Date
2026-06-30

AI Technical Summary

Technical Problem

Existing passivating agent dosing equipment suffers from problems such as uneven spraying, difficulty in covering large areas, and repeated spraying leading to resource waste and increased costs.

Method used

The system employs a combination of a rotating frame mechanism and a traveling frame mechanism to achieve circumferential rotation and lateral movement of the nozzles. Combined with a power pump and a diverter design, it ensures uniform liquid coverage. The trolley's bottom wheels facilitate movement, and the electric telescopic rod adjusts the spraying height, while the servo motor drives the adjustment of the spraying range and direction.

Benefits of technology

It achieves uniform spraying of passivating agent, avoids spraying dead zones, reduces liquid consumption, improves spraying efficiency and equipment flexibility, and reduces resource waste and environmental pollution.

✦ Generated by Eureka AI based on patent content.

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Abstract

This utility model discloses a passivating agent preparation and dispensing device for soil pollution remediation, including a trolley, a rotating frame mechanism, and a traveling frame mechanism. The rotating frame mechanism is installed on the top of the trolley, and a rotating shaft is installed on its outer wall. An upper retaining sleeve is installed at the top of the rotating shaft, and the rotating shaft is movably connected to the rotating frame mechanism via the upper retaining sleeve. A lower retaining sleeve is fitted at the bottom of the rotating shaft, and the rotating shaft is movably connected to the rotating frame mechanism via the lower retaining sleeve. An I-beam is installed on the side wall of the rotating shaft. This utility model allows users to adjust the spraying range, spray volume, and spraying direction according to actual needs, simplifying operation and improving work efficiency. The electric telescopic rod design allows for adjustment of the height of the diversion pipe, adapting to different spraying height requirements, further enhancing the applicability and ease of operation of the equipment. Precise spray control reduces liquid waste and lowers operating costs.
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Description

Technical Field

[0001] This utility model relates to the field of soil remediation technology, specifically to a device for preparing and dispensing passivating agents for soil pollution remediation. Background Technology

[0002] With the rapid advancement of industrialization and urbanization, soil pollution has become an increasingly prominent problem, posing a serious threat to the ecological environment and human health. Issues such as heavy metal pollution and organic pollution in soil urgently need to be addressed. Among these solutions, in-situ remediation of contaminated soil using passivating agents is an economical and efficient treatment technology. Passivating agents reduce the bioavailability and mobility of pollutants in the soil through chemical reactions, thereby enabling the safe utilization of the soil.

[0003] In soil pollution remediation projects, the uniform application of passivating agents is a crucial step in ensuring remediation effectiveness. Currently, most passivating agent application equipment on the market suffers from the following shortcomings:

[0004] Traditional equipment often employs fixed spraying structures or manual hand-held spraying methods. The spraying angle and range are fixed or limited in adjustment, easily creating spray dead zones. This results in uneven distribution of the passivating agent on the soil surface or in the shallow layer, affecting the consistency of remediation results. While some equipment can be moved over a small area, it is difficult to cover large contaminated areas, and repeated spraying can easily lead to localized overdose of the agent, increasing remediation costs. Furthermore, due to uneven spraying, excessive amounts of passivating agent are often required to ensure remediation effectiveness, resulting in resource waste. Utility Model Content

[0005] The purpose of this invention is to provide a passivating agent preparation and application device for treating soil pollution, so as to solve the problems mentioned in the background art.

[0006] To achieve the above objectives, this utility model provides the following technical solution: a passivating agent preparation and dosing device for treating soil pollution, comprising a trolley, a rotating frame mechanism, and a traveling frame mechanism. A storage tank is installed at the top of the trolley, and traveling wheels are symmetrically installed at the bottom of the trolley. A handle is installed on the side wall of the trolley. The rotating frame mechanism is installed at the top of the trolley, and a rotating shaft is installed on its outer wall. An upper retaining sleeve is installed at the top of the rotating shaft, and the rotating shaft is movably connected to the rotating frame mechanism via the upper retaining sleeve. A lower retaining sleeve is fitted at the bottom of the rotating shaft, and the rotating shaft is movably connected to the rotating frame mechanism via the lower retaining sleeve. An I-beam is installed on the side wall of the rotating shaft.

[0007] The traveling frame mechanism is mounted on the surface of the I-beam and is slidably connected to the I-beam. Two sets of rollers are symmetrically installed inside the traveling frame mechanism.

[0008] Preferably, a support sleeve is installed at the bottom end of the walking frame mechanism, a support rod is installed at the bottom end of the support sleeve, a diverter pipe is installed at the bottom end of the support rod, and multiple sets of nozzles with equal spacing are installed at the bottom end of the diverter pipe.

[0009] Preferably, a power pump is installed on the top of the trolley on one side of the rotating frame mechanism, and a delivery pipe is installed at the input end of the power pump, extending into the interior of the liquid storage tank.

[0010] Preferably, the output end of the power pump is equipped with a hose, and one end of the hose extends into the interior of the splitter pipe.

[0011] Preferably, a drive gear is installed at the bottom end of the rotating shaft below the lower sleeve, and a servo motor is installed inside the rotating frame mechanism on one side of the drive gear. A drive gear is installed at the output end of the servo motor, and the drive gear meshes with the drive gear.

[0012] Preferably, a servo motor is installed on the outer wall of the walking frame mechanism on one side of the roller, and a drive shaft is installed at the output end of the servo motor, and the drive shaft is fixedly connected to the roller.

[0013] Preferably, an electric telescopic rod is installed at the bottom of the walking frame mechanism on one side of the support sleeve, and the bottom of the electric telescopic rod is connected to the diversion pipe, and a controller is installed at the top of the trolley on one side of the liquid storage tank.

[0014] Compared with the prior art, this utility model has significant technical advantages and positive effects, which are specifically reflected in the following aspects:

[0015] 1. By coordinating the rotating frame mechanism and the traveling frame mechanism, the nozzle achieves circumferential rotation and lateral movement, resulting in a wider and more uniform spraying range. Compared with traditional fixed spraying equipment, this invention effectively avoids spraying dead zones, ensures uniform liquid coverage of the target area, and significantly improves spraying efficiency. The combination of the power pump and the diversion pipe ensures stable liquid pressure during spraying, further enhancing spray uniformity.

[0016] 2. The wheel design at the bottom of the trolley makes the entire equipment easy to move, suitable for spraying operations in different terrains and locations. Users can easily move the equipment to the designated position according to actual needs, greatly facilitating operation. The sliding connection between the walking frame mechanism and the I-beam, combined with the rollers driven by the servo motor, realizes the lateral movement adjustment of the walking frame mechanism, allowing the nozzles to spray laterally over a wider range, enhancing the flexibility of the equipment.

[0017] 3. Users can adjust the spray range, spray volume, and spray direction according to actual needs, making operation simple and improving work efficiency. The electric telescopic rod design allows for adjustment of the height of the diverter pipe to adapt to spraying needs at different heights, further enhancing the applicability and ease of operation of the equipment. Precise spray control reduces liquid waste and lowers operating costs. Compared with traditional spraying equipment, this invention can reduce liquid consumption while ensuring spraying effect, resulting in significant resource savings. The equidistant nozzle design ensures uniform liquid distribution, reducing resource waste and environmental pollution caused by uneven spraying.

[0018] 4. The ingenious design of the rotating frame mechanism and rotating shaft, combined with the movable connection of the upper and lower ferrules, ensures stability and durability during rotation. The meshing design of the drive gear and drive gear provides reliable rotational power, giving the entire device excellent structural stability and durability, enabling it to operate stably for extended periods in complex environments. Attached Figure Description

[0019] Figure 1 This is a front view cross-sectional structural diagram of the present invention;

[0020] Figure 2 This is a side view cross-sectional structural diagram of the liquid storage tank of this utility model;

[0021] Figure 3 This is an enlarged front view cross-sectional schematic diagram of the drive gear disk of this utility model.

[0022] Figure 4 This is an enlarged side cross-sectional view of the roller of this utility model;

[0023] Figure 5 This is a schematic diagram of the nozzle part of this utility model.

[0024] In the diagram: 1. Trolley; 2. Wheels; 3. Handle; 4. Storage tank; 5. Power pump; 6. Delivery pipe; 7. Drive gear; 8. Drive gear plate; 9. Lower ferrule; 10. Rotating frame mechanism; 11. Servo motor II; 12. Rotating shaft; 13. Upper ferrule; 14. Hoses; 15. I-beam; 16. Diverter pipe; 17. Controller; 18. Support sleeve; 19. Support rod; 20. Servo motor I; 21. Roller; 22. Drive shaft; 23. Nozzle; 24. Walking frame mechanism; 25. Electric telescopic rod. Detailed Implementation

[0025] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present utility model without creative effort are within the scope of protection of the present utility model.

[0026] Please see Figure 1-5 One embodiment of this utility model is a passivating agent preparation and dosing device for treating soil pollution, which includes a trolley 1, a rotating frame mechanism 10 and a walking frame mechanism 24. A liquid storage tank 4 is installed on the top of the trolley 1, and walking wheels 2 are symmetrically installed on the bottom of the trolley 1. A handle 3 is installed on the side wall of the trolley 1.

[0027] Storage tank 4: Located at the top of the trolley 1, storage tank 4 is used to store passivating agent liquid. Storage tank 4 is made of corrosion-resistant high-density polyethylene, and a liquid level indicator is installed on the tank body so that operators can monitor liquid level changes at any time.

[0028] Walking wheels 2: Walking wheels 2 are symmetrically installed at the bottom of the cart 1. Each walking wheel 2 has a diameter of 20 cm and is made of wear-resistant rubber. The axle is made of stainless steel to ensure stability and durability on complex terrain.

[0029] Handle 3: Handle 3 is installed on the side wall of trolley 1 and is made of non-slip material to facilitate the operator to push and pull the equipment.

[0030] The rotating frame mechanism 10 is installed on the top of the trolley 1. A rotating shaft 12 is installed on the outer wall of the rotating frame mechanism 10. An upper retaining sleeve 13 is installed on the top of the rotating shaft 12, and the rotating shaft 12 is movably connected to the rotating frame mechanism 10 through the upper retaining sleeve 13. A lower retaining sleeve 9 is fitted on the bottom of the rotating shaft 12, and the rotating shaft 12 is movably connected to the rotating frame mechanism 10 through the lower retaining sleeve 9. An I-beam 15 is installed on the side wall of the rotating shaft 12.

[0031] A rotating shaft 12 is mounted on the outer wall of the rotating frame mechanism 10. The rotating shaft 12 is made of high-strength steel to ensure its load-bearing capacity and durability. An upper retaining sleeve 13 is mounted on the top of the rotating shaft 12, and the upper retaining sleeve 13 is fixedly connected to the rotating shaft 12 by fasteners (such as bolts and nuts). The inner wall of the upper retaining sleeve 13 has a groove that mates with the top of the rotating shaft 12 to form a movable connection, allowing the rotating shaft 12 to rotate freely within the upper retaining sleeve 13.

[0032] A lower retaining sleeve 9 is fitted onto the bottom end of the rotating shaft 12. The lower retaining sleeve 9 is also fixedly connected to the rotating shaft 12 by fasteners, and its inner wall is also provided with a groove, which cooperates with the bottom end of the rotating shaft 12 to form a movable connection. The function of the lower retaining sleeve 9 is to support the rotating shaft 12 and prevent it from shifting during rotation.

[0033] An I-beam 15 is installed on the side wall of the rotating shaft 12. The I-beam 15 is made of I-shaped steel and has high bending strength and load-bearing capacity. The I-beam 15 is fixed to the side wall of the rotating shaft 12 by welding or bolting, and its two ends extend to the outer wall of the rotating frame mechanism 10 to form a stable support structure.

[0034] A drive gear 8 is installed at the bottom of the rotating shaft 12 below the lower sleeve 9. A servo motor 2 11 is installed inside the rotating frame mechanism 10 on one side of the drive gear 8. A drive gear 7 is installed at the output end of the servo motor 2 11, and the drive gear 7 meshes with the drive gear 8.

[0035] Lower sleeve 9: Located at the bottom of the entire device, the lower sleeve 9 serves to fix and support the rotating shaft 12. Its structure is cylindrical, with an internal hole that matches the diameter of the rotating shaft 12, ensuring that the rotating shaft 12 can be stably installed in the sleeve.

[0036] Rotating shaft 12: The rotating shaft 12 is one of the core components of this device, and its bottom end is connected to the drive gear disk 8. The rotating shaft 12 is made of high-strength steel to ensure its stability and durability during high-speed rotation.

[0037] Drive gear 8: Drive gear 8 is installed at the bottom of the rotating shaft 12. Its function is to transmit the power of servo motor 11 to the rotating shaft 12.

[0038] Rotating frame mechanism 10: The rotating frame mechanism 10 is located on one side of the drive gear 8, and has a mounting position for the second servo motor 11 inside. The design of the rotating frame mechanism 10 should ensure that the output end of the second servo motor 11 is aligned with the input end of the drive gear 7 to ensure efficient power transmission.

[0039] Servo motor 21: Servo motor 211 is the power source of this device, and its output end is equipped with drive gear 7. Servo motor 211 is a high-precision, high-torque servo motor to ensure the stable rotation of the drive gear 8.

[0040] Drive gear 7: Drive gear 7 is installed at the output end of servo motor 11. Drive gear 7 meshes with drive gear 8, transmitting the power of servo motor 11 to drive gear 8.

[0041] The traveling frame mechanism 24 is mounted on the surface of the I-beam 15 and is slidably connected to the I-beam 15. Two sets of rollers 21 are symmetrically installed inside the traveling frame mechanism 24.

[0042] A servo motor 20 is installed on the outer wall of the walking frame mechanism 24 on one side of the roller 21. A drive shaft 22 is installed at the output end of the servo motor 20, and the drive shaft 22 is fixedly connected to the roller 21.

[0043] The inner wall of the walking frame mechanism 24 is provided with a roller mounting groove for fixing the roller 21.

[0044] Roller 21 is made of high wear-resistant polyurethane material with a smooth surface to reduce friction with I-beam 15.

[0045] The roller 21 is connected to the mounting slot of the traveling frame mechanism 24 via a bearing, ensuring that the roller 21 can rotate freely.

[0046] Servo motor 20 is mounted on the outer wall of the walking frame mechanism 24, located on one side of the roller 21.

[0047] The Servo Motor 120 uses a high-precision servo motor, which has good speed regulation performance and output torque.

[0048] The servo motor 20 is fixed in place with bolts to ensure its stability and reliability during operation.

[0049] The drive shaft 22 is installed at the output end of the servo motor 20 and is connected to the output shaft of the servo motor 20 via a coupling.

[0050] The drive shaft 22 is made of high-strength steel and its surface is treated with rust prevention.

[0051] One end of the drive shaft 22 is fixedly connected to the roller 21 to realize transmission.

[0052] A support sleeve 18 is installed at the bottom of the walking frame mechanism 24, and an electric telescopic rod 25 is installed at the bottom of the walking frame mechanism 24 on one side of the support sleeve 18. The bottom of the electric telescopic rod 25 is connected to the diversion pipe 16.

[0053] A support rod 19 is installed at the bottom of the support sleeve 18, a diverter pipe 16 is installed at the bottom of the support rod 19, and multiple sets of nozzles 23 with equal spacing are installed at the bottom of the diverter pipe 16.

[0054] A power pump 5 is installed on the top of the trolley 1 on one side of the rotating frame mechanism 10. A delivery pipe 6 is installed at the input end of the power pump 5, and the delivery pipe 6 extends into the interior of the liquid storage tank 4. A controller 17 is installed on the top of the trolley 1 on one side of the liquid storage tank 4.

[0055] The output end of the power pump 5 is equipped with a hose 14, and one end of the hose 14 extends into the interior of the diverter pipe 16.

[0056] The overall structure of the traveling frame mechanism 24 includes a bottom support 18, an electric telescopic rod 25, a diverter pipe 16, and multiple sets of nozzles 23. The support 18 is fixed to the bottom of the traveling frame mechanism 24, serving to support and stabilize the entire mechanism. An electric telescopic rod 25 is installed on one side of the support 18, and the bottom end of the electric telescopic rod 25 is connected to the diverter pipe 16. By extending and retracting the electric telescopic rod 25, the height of the diverter pipe 16 can be adjusted to meet the spraying needs at different heights.

[0057] A support rod 19 is further installed at the bottom end of the support sleeve 18, and the bottom end of the support rod 19 is fixedly connected to the diverter pipe 16. Several sets of nozzles 23 are evenly distributed at the bottom end of the diverter pipe 16. These nozzles 23 are arranged at equal intervals to ensure uniform distribution of the sprayed liquid. The design of each set of nozzles 23 allows it to be adjusted under different pressures to adapt to different spraying needs.

[0058] A trolley 1 is mounted on one side of the rotating frame mechanism 10, and a power pump 5 is fixed to the top of the trolley 1. The input end of the power pump 5 is connected to the liquid storage tank 4 through a delivery pipe 6, which extends into the interior of the liquid storage tank 4 to ensure that the liquid can be smoothly delivered to the power pump 5. The liquid storage tank 4 is fixed to one side of the trolley 1 for easy movement and liquid replacement.

[0059] The output end of the power pump 5 is connected to a hose 14, one end of which extends into the interior of the distributor pipe 16, ensuring that the liquid output from the power pump 5 can be evenly distributed to each nozzle 23. The hose 14 is made of a material with good flexibility and corrosion resistance to adapt to the usage requirements in different environments.

[0060] The controller 17 is installed on the top of the trolley 1 on one side of the liquid storage tank 4. The controller 17 can achieve precise control of the power pump 5, the electric telescopic rod 25 and the nozzle 23.

[0061] Working principle: When in use, pour the prepared passivating agent liquid into the storage tank 4 and confirm the liquid volume through the liquid level indicator on the storage tank 4; the operator holds the handle 3 and pushes the equipment to a suitable position in the soil area to be treated by using the walking wheels 2 at the bottom of the trolley 1.

[0062] Operator controller 17 starts the entire equipment system. At this time, power pump 5 starts to work and draws passivating agent liquid from storage tank 4 through delivery pipe 6 at the input end. After being pressurized by power pump 5, the liquid is delivered to the diversion pipe 16 through hose 14 at the output end.

[0063] Depending on the soil surface condition or treatment needs, the electric telescopic rod 25 is extended and retracted by the controller 17. The electric telescopic rod 25 drives the diversion pipe 16 to move up and down, thereby adjusting the height of the nozzle 23 at the bottom of the diversion pipe 16 until a suitable spraying height is achieved.

[0064] Start the servo motor 20. The output of the servo motor 20 drives the drive shaft 22 to rotate. The drive shaft 22 drives the roller 21 to roll on the surface of the I-beam 15, so that the walking frame mechanism 24 slides laterally along the I-beam 15, thereby adjusting the lateral spraying coverage of the nozzle 23 to ensure coverage of the target lateral area.

[0065] When servo motor 21 is started, the drive gear 7 at the output end of servo motor 21 rotates. Because the drive gear 7 meshes with the drive gear disk 8, it drives the drive gear disk 8 and the rotating shaft 12 connected to it to rotate. The rotating shaft 12 rotates stably under the limiting support of the upper sleeve 13 and the lower sleeve 9. At the same time, it drives the I-beam 15 and the walking frame mechanism 24 to make a circular motion as a whole, so that the spraying range of the nozzle 23 is expanded to the circumferential area, avoiding spray dead corners.

[0066] After the above adjustments are completed, the passivating agent liquid is distributed to each group of nozzles 23 through the diversion pipe 16, and is evenly sprayed onto the soil to be treated by the nozzles 23. During the process, the output pressure of the power pump 5 can be adjusted in real time by the controller 17 to ensure that the spraying pressure is stable. At the same time, the lateral position and rotation angle of the walking frame mechanism 24 can be adjusted by the servo motor 1 20 and the servo motor 2 11 according to the actual situation to ensure that the passivating agent evenly covers the entire treatment area.

[0067] Obviously, the embodiments described above are only some embodiments of this utility model, and not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort should fall within the protection scope of this utility model.

[0068] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to this application. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0069] It should be noted that the terms "first," "second," etc., used in the specification, claims, and accompanying drawings of this application are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of this application described herein can be implemented in sequences other than those illustrated or described herein.

[0070] The above are merely preferred embodiments of this utility model and are not intended to limit the scope of this utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A passivating agent preparation and dispensing device for treating soil pollution, comprising a trolley (1), a rotating frame mechanism (10), and a traveling frame mechanism (24), characterized in that: The top of the trolley (1) is equipped with a liquid storage tank (4), and the bottom of the trolley (1) is symmetrically equipped with walking wheels (2). The side wall of the trolley (1) is equipped with a handle (3). The rotating frame mechanism (10) is installed on the top of the trolley (1). The outer wall of the rotating frame mechanism (10) is equipped with a rotating shaft (12). The top of the rotating shaft (12) is equipped with an upper sleeve (13), and the rotating shaft (12) is movably connected to the rotating frame mechanism (10) through the upper sleeve (13). The bottom of the rotating shaft (12) is fitted with a lower sleeve (9), and the rotating shaft (12) is movably connected to the rotating frame mechanism (10) through the lower sleeve (9). The side wall of the rotating shaft (12) is equipped with an I-beam (15). The walking frame mechanism (24) is installed on the surface of the I-beam (15) and is slidably connected to the I-beam (15). Two sets of rollers (21) are symmetrically installed inside the walking frame mechanism (24).

2. The passivating agent preparation and dosing equipment for treating soil pollution according to claim 1, characterized in that: The bottom end of the walking frame mechanism (24) is equipped with a support sleeve (18), the bottom end of the support sleeve (18) is equipped with a support rod (19), the bottom end of the support rod (19) is equipped with a diverter pipe (16), and the bottom end of the diverter pipe (16) is equipped with multiple sets of nozzles (23) at equal intervals.

3. The passivating agent preparation and dosing equipment for treating soil pollution according to claim 1, characterized in that: A power pump (5) is installed on the top of the trolley (1) on one side of the rotating frame mechanism (10). A delivery pipe (6) is installed at the input end of the power pump (5), and the delivery pipe (6) extends into the interior of the liquid storage tank (4).

4. The passivating agent preparation and dosing equipment for treating soil pollution according to claim 3, characterized in that: The output end of the power pump (5) is equipped with a hose (14), and one end of the hose (14) extends into the interior of the shunt pipe (16).

5. The passivating agent preparation and dosing equipment for treating soil pollution according to claim 1, characterized in that: A drive gear (8) is installed at the bottom end of the rotating shaft (12) below the lower sleeve (9). A servo motor (11) is installed inside the rotating frame mechanism (10) on one side of the drive gear (8). A drive gear (7) is installed at the output end of the servo motor (11), and the drive gear (7) meshes with the drive gear (8).

6. The passivating agent preparation and dosing equipment for treating soil pollution according to claim 1, characterized in that: A servo motor (20) is installed on the outer wall of the walking frame mechanism (24) on one side of the roller (21). A drive shaft (22) is installed at the output end of the servo motor (20), and the drive shaft (22) is fixedly connected to the roller (21).

7. The passivating agent preparation and dosing equipment for treating soil pollution according to claim 2, characterized in that: An electric telescopic rod (25) is installed at the bottom of the walking frame mechanism (24) on one side of the support (18), and the bottom of the electric telescopic rod (25) is connected to the diversion pipe (16). A controller (17) is installed at the top of the trolley (1) on one side of the liquid storage tank (4).