Soil steam sterilization device for agricultural land remediation

Abstract

The utility model relates to agricultural machinery technical field discloses a soil steam sterilization device for agricultural land restoration. The device includes a fixed plate, the bottom four corners of which are provided with a stand with moving wheels, and the top is provided with a handrail and a steam generator. A soil crushing mechanism is fixedly installed on one side of the bottom of the fixed plate, which is driven by a motor to rotate the rotating shaft with crushing teeth to crush the hardened soil; a movable disinfection mechanism is installed in the middle, which is engaged with the movable connecting column with teeth on the fixed shell, driving the connector and multiple jet pipes at the bottom to vertically lift. The connector is assisted by the movable connecting rod for guidance, and the outer wall of the jet pipe is provided with a mud scraping plate connected by a spring. The utility model solves the problem of poor deep layer penetration of hardened soil by combining the pre-treatment of crushing with the forced lifting steam injection structure, and automatically scrapes off the adhered mud and dirt when the pipe is pulled out by using the mud scraping plate, effectively preventing the outlet hole from being blocked, and ensuring the stability of continuous operation.

Description

Technical Field

[0001] This utility model relates to the field of agricultural machinery technology, and in particular to a soil steam sterilization device for agricultural land remediation. Background Technology

[0002] With the rapid development of modern facility agriculture, soil continuous cropping obstacles and soil-borne diseases have become increasingly prominent, becoming important factors restricting crop yield and quality. Among the many soil remediation methods, high-temperature steam sterilization is widely used due to its advantages such as no chemical residue and thorough sterilization. Current soil steam sterilization operations usually involve surface mulching and fumigation or using mobile equipment to insert steam injection pipes into the soil for fumigation, attempting to kill deep-seated pathogens, insect eggs, and weed seeds through high-temperature heat.

[0003] However, in practical applications, agricultural land to be restored is often accompanied by severe compaction, with high soil hardness and poor aeration. Existing immersion steam sterilization equipment, when dealing with such compacted soil, often directly drives the steam injection pipe downwards. This not only results in huge insertion resistance, easily causing the steam injection pipe to bend and deform or the lifting mechanism to be damaged due to uneven stress, but also, in hard soil that has not been loosened, the lateral diffusion capacity of steam is extremely weak, making it difficult to penetrate into the soil aggregates, resulting in uneven sterilization effects and the existence of sterilization dead zones.

[0004] Furthermore, during the repeated insertion and withdrawal of the steam injection pipe, the soil, after being moistened by steam, becomes significantly more sticky and easily adheres to the surface of the steam injection pipe and the vent. Because existing equipment lacks an effective synchronous cleaning structure, as operating time progresses, the accumulated soil will clog the vent, severely affecting the steam release efficiency. Moreover, the hardened mud will further increase the frictional resistance during the next insertion, seriously impacting the equipment's continuous operating capacity and service life.

[0005] Therefore, this utility model proposes a soil steam sterilization device for agricultural land remediation to address the shortcomings of existing technologies. Summary of the Invention

[0006] To overcome the above shortcomings, this utility model provides a soil steam sterilization device for agricultural land remediation, which aims to improve the technical problems of poor steam penetration effect on compacted soil and easy adhesion of soil when the jet pipe is pulled out, resulting in blockage and bacteria.

[0007] To achieve the above objectives, this utility model provides the following technical solution: a soil steam sterilization device for agricultural land remediation, comprising: a fixed plate, and columns respectively fixedly installed at the four corners of the bottom of the fixed plate, the bottom ends of the columns being rotatably connected to moving wheels for movement, the top of the fixed plate being fixedly installed with a handrail for personnel to hold and a steam generator for generating high-temperature steam; and a soil crushing mechanism and a movable sterilization mechanism installed on the fixed plate.

[0008] The soil pulverizing mechanism is fixedly installed on one bottom side of the fixed plate for pretreatment of the area to be remediated. The movable sterilization mechanism is installed in the middle of the fixed plate for deep steam injection. The movable sterilization mechanism mainly consists of a fixed outer shell bolted to the top of the fixed plate, a toothed movable connecting column vertically slidably connected inside the fixed outer shell, and a movable gear rotatably connected to the side of the fixed outer shell and meshing with the toothed column.

[0009] Furthermore, the bottom end of the movable connecting column passes through the fixed plate and is fixedly connected to a connector. The bottom of the connector is connected to multiple rows of jet pipes, and a movable connecting rod for auxiliary guidance is connected between the connector and the fixed plate. The air outlet of the steam generator is connected to the connector through an air guide pipe, thereby driving the movable connecting column to rise and fall through the movable gear, causing the multiple rows of jet pipes to be inserted into the soil for steam fumigation.

[0010] Preferably, to achieve automatic cleaning of the surface of the steam injection pipe and prevent clogging of the air outlet, a scraper is slidably fitted on the outer wall of the multi-row jet pipe. A connecting spring connects the scraper to the connector, and the connecting spring is fitted around the outer periphery of the multi-row jet pipe. This structure utilizes the elastic restoring force of the connecting spring to drive the scraper to slide along the pipe wall when the multi-row jet pipe is pulled out of the soil, scraping off the attached mud and dirt.

[0011] Preferably, the soil pulverizing mechanism is specifically configured as follows: it includes a motor fixedly installed on the side wall of the column, the output shaft of the motor is fixedly connected to a rotating shaft with several pulverizing teeth, and a mudguard fixed to the column is provided above the rotating shaft. By driving the rotating shaft and the pulverizing teeth to rotate by the motor, the compacted soil surface layer can be pre-broken, reducing the resistance of subsequent steam injection pipe insertion.

[0012] Preferably, in order to improve the stability of the lifting mechanism and prevent lateral deflection, one end of the movable connecting rod is welded and fixed to the bottom of the fixed plate, and the other end is slidably inserted into the guide hole opened by the connector and slidably engaged with the connector, thereby forming a multi-point positioning support with the movable connecting column.

[0013] Preferably, in order to further reduce soil breaking resistance and optimize air output effect, the end of the multi-row jet pipe away from the connector has a conical pointed structure, and the side wall of the multi-row jet pipe is provided with several air outlets near the bottom.

[0014] Preferably, the scraper is a rectangular metal plate with several through holes corresponding to the multiple rows of air jets. The inner wall of the through holes is tightly fitted to the outer wall of the multiple rows of air jets to ensure the scraping effect.

[0015] Preferably, the two ends of the connecting spring are fixedly connected to the bottom surface of the connector and the top surface of the scraper, respectively, to ensure that the elastic force can be effectively transmitted.

[0016] Preferably, the air guide tube is made of high-temperature resistant corrugated hose, and the length of the air guide tube is designed to be greater than the maximum vertical stroke of the movable connecting column. Both ends of the air guide tube are fixed by pipe clamps to adapt to high-temperature environments and frequent mechanical reciprocating motion.

[0017] Preferably, in order to prevent the lifting shaft from rotating, the cross-section of the movable connecting column is designed as a rectangular structure, and a rectangular guide hole that cooperates with the movable connecting column is provided at the center of the fixed housing.

[0018] Preferably, a control panel is also provided on one side of the fixed plate. The control panel is electrically connected to the drive parts of the soil crushing mechanism, the steam generator, and the active disinfection mechanism to realize the electrical automation control of the device.

[0019] This utility model has the following beneficial effects: 1. In this utility model, by setting a soil crushing mechanism at the front end of the bottom of the fixed plate, and cooperating with the movable disinfection mechanism in the middle, the problems of the prior art in which compacted soil is difficult to be directly subjected to deep steam disinfection and the poor permeability of steam in hard soil are solved. It achieves the technical effect of first using rotating crushing teeth to mechanically tillage and break up the compacted surface, effectively increasing soil porosity, and then using gear and rack transmission to drive multiple rows of jet pipes to insert into the deep soil for internal steam injection, reducing the pipe insertion resistance and greatly improving the diffusion range of high temperature steam in the soil and the thoroughness of sterilization.

[0020] In this invention, by sliding a scraper blade onto the outer wall of the multi-row air jet pipes and connecting the scraper blade to the connector using a connecting spring, the problem of existing soil insertion equipment where a large amount of wet soil easily adheres to the pipe wall after operation and pulls out, causing blockage of the air outlet or increasing frictional resistance for the next insertion is solved. The invention achieves the technical effect of using the elastic potential energy released by the spring to drive the scraper blade to move downward relative to the multi-row air jet pipes, automatically and forcibly scraping off the mud and dirt adhering to the pipe wall during the pipe pulling process, without the need for manual shutdown for cleaning, effectively preventing blockage of the air outlet, and ensuring the stability and efficiency of continuous operation of the device.

[0021] In this invention, by setting a movable connecting rod and a connector for sliding guidance, and by cooperating with a movable connecting column with a rectangular cross-section and a rectangular guide hole in the fixed housing, the problem of existing lifting and steam injection mechanisms easily rotating or tilting when encountering lateral forces generated by uneven soil hardness, leading to mechanical structure jamming or jet pipe bending and deformation, is solved. This achieves the technical effect of constructing a stable guiding support system with multi-point positioning, strictly limiting the circumferential rotational freedom of the connecting components, ensuring the verticality and structural rigidity of multiple jet pipes during insertion into high-resistance soil, and extending the service life of the equipment. Attached Figure Description

[0022] Figure 1 This is a three-dimensional structural diagram of a soil steam sterilization device for agricultural land remediation proposed in this utility model. Figure 2 This is a schematic diagram of the handrail portion of a soil steam sterilization device for agricultural land remediation proposed in this utility model. Figure 3 This is a schematic diagram of the steam generator part of a soil steam sterilization device for agricultural land remediation proposed in this utility model; Figure 4 This is a schematic diagram of the scraper section of a soil steam sterilization device for agricultural land remediation proposed in this utility model. Figure 5 for Figure 3 Enlarged view of point A in the middle.

[0023] Legend: 1. Fixed plate; 2. Handrail; 3. Steam generator; 4. Casters; 5. Movable disinfection mechanism; 501. Fixed outer shell; 502. Movable connecting column; 503. Connector; 504. Connecting spring; 505. Multi-row jet pipe; 506. Scraper; 507. Movable gear; 6. Movable connecting rod; 7. Soil crushing mechanism; 701. Mud baffle; 702. Crushing teeth; 703. Motor; 704. Rotating shaft; 8. Column; 9. Air guide pipe. Detailed Implementation

[0024] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0025] Example: Please refer to Figures 1 to 5 This utility model provides a soil steam sterilization device for agricultural land remediation, which aims to solve the technical problems of poor steam penetration effect when directly injecting steam into compacted soil and easy adhesion of soil to the jet pipe when it is pulled out, resulting in blockage and bacteria.

[0026] like Figure 1 and Figure 2 As shown, the main support structure of the soil steam disinfection device for agricultural land remediation includes a fixed plate 1, which serves as the mounting base and bearing platform for the entire device. The fixed plate 1 is made of high-strength metal sheet to ensure structural stability. Columns 8 are fixedly installed at the four corners of the bottom of the fixed plate 1. The bottom of each column 8 is rotatably connected to a caster wheel 4 via bearings. The caster wheel 4 is a self-locking universal wheel to facilitate flexible turning and parking of the device in the field. A handrail 2 is fixedly installed on one edge of the top of the fixed plate 1 by welding. The handrail 2 is used for operators to push the control device forward. A steam generator 3 is fixedly installed on the top side of the fixed plate 1 away from the handrail 2. The steam generator 3 serves as the source of high-temperature, high-pressure steam, converting water into disinfection steam through an internal heating element. A control panel is also provided on one side of the fixed plate 1. The control panel is electrically connected to the steam generator 3 and the various drive motors mentioned later for centralized control.

[0027] At the front end of the bottom of the fixed plate 1, i.e., on the side away from the handrail 2, a soil crushing mechanism 7 is fixedly installed. The soil crushing mechanism 7 is used to pre-till and crush the compacted soil before steam sterilization to increase soil porosity and facilitate the deep penetration of subsequent steam. The soil crushing mechanism 7 is mainly powered by a motor 703 fixedly installed on the side wall of the column 8. The output shaft of the motor 703 is fixedly connected to a horizontally set rotating shaft 704 through a coupling. The two ends of the rotating shaft 704 are respectively rotated and engaged with the bearing seats on the two side columns 8. Several crushing teeth 702 are uniformly welded and fixed on the outer surface of the rotating shaft 704 along the circumferential direction. The crushing teeth 702 are arranged in an alternating pattern to improve soil crushing efficiency. An arc-shaped mudguard 701 is also set directly above the rotating shaft 704. The two ends of the mudguard 701 are fixedly connected to the two side columns 8 respectively. The mudguard 701 is used to block the mud splashed during the crushing operation to prevent it from contaminating the equipment above or injuring the operators.

[0028] The active disinfection mechanism 5 includes a fixed outer shell 501 installed on the top plane of the fixed plate 1 by bolt connection. The fixed outer shell 501 serves as a support for the core drive component. A through guide channel is opened vertically inside the fixed outer shell 501. A movable connecting column 502 is vertically slidably fitted inside the fixed outer shell 501. The movable connecting column 502 serves as a power transmission carrier. Its cross-section is designed as a rectangular structure, which is matched with the rectangular guide hole opened in the center of the fixed outer shell 501. This non-circular cross-section fit can effectively prevent the movable connecting column 502 from rotating during the lifting process. The side of the movable connecting column 502 is machined with standard teeth extending along its length. A movable gear 507 is rotatably connected to the side wall of the fixed outer shell 501. The teeth of the movable gear 507 are in a tight meshing state with the teeth of the movable connecting column 502. The movable gear 507 is driven to rotate by an external drive motor. The rotational motion is converted into linear reciprocating motion of the movable connecting column 502 in the vertical direction by the meshing transmission of the gear and rack.

[0029] The bottom end of the movable connecting column 502 passes through the fixed plate 1 and extends downwards. A connector 503 is fixedly connected to its end. The connector 503 serves as a steam distribution collection chamber. Its bottom is connected to multiple rows of jet pipes 505, which are arranged in an array to cover a sufficiently wide working area. The end of the multiple rows of jet pipes 505 away from the connector 503 is processed into a conical pointed structure. This pointed design is intended to reduce the penetration resistance when the pipe is inserted into compacted soil. Several micro air outlets are opened on the side wall of the multiple rows of jet pipes 505 near the bottom end to release high-pressure steam evenly into the deep soil. The air outlet of the steam generator 3 is connected to the air inlet of the connector 503 through the air guide pipe 9. The air guide pipe 9 is made of high-temperature resistant corrugated hose, and the reserved length of the air guide pipe 9 is greater than the maximum vertical stroke of the movable connecting column 502. Both ends of the air guide pipe 9 are sealed and fixed with pipe clamps to ensure that the steam passage does not leak or break during frequent lifting and lowering.

[0030] Meanwhile, in order to further improve the vertical stability and lateral force resistance of connector 503 and multi-row jet pipe 505 during soil insertion, a movable connecting rod 6 is specially provided between the bottom of the fixing plate 1 and connector 503. One end of the movable connecting rod 6 is firmly fixed to the bottom surface of the fixing plate 1 by welding, and the other end extends vertically downward and slides into the special guide hole opened on the surface of connector 503. In the assembled state, connector 503 slides up and down along the surface of movable connecting rod 6. Movable connecting rod 6 and the aforementioned rectangular movable connecting column 502 together form a stable support system of "double-point positioning" or "multi-point positioning", ensuring that even in the case of uneven soil hardness, multi-row jet pipe 505 can maintain a vertical posture without tilting or causing the mechanism to jam.

[0031] As a preferred embodiment, to address the problem that a large amount of soil easily adheres to the surface of the steam jet pipe during repeated insertion and extraction from moist, sticky soil, thus affecting heat dissipation efficiency and resistance to subsequent insertions, a scraper 506 is slidably fitted onto the outer wall of the multi-row jet pipe 505. The scraper 506 is designed as a rectangular metal plate with several through holes on its surface corresponding to the multi-row jet pipe 505. The inner wall of the through holes and the outer wall of the multi-row jet pipe 505 are fitted together with a tight clearance to ensure that the scraper 506 can effectively scrape off the soil adhering to the pipe wall when sliding along the multi-row jet pipe 505. The top surface of the scraper 506 is connected to the connector 503. A connecting spring 504 is connected between the bottom surfaces of the multi-row jet pipes 505. The connecting spring 504 is sleeved on the outer periphery of the multi-row jet pipes 505, and the upper end of the connecting spring 504 is fixedly connected to the bottom surface of the connector 503, and the lower end is fixedly connected to the top surface of the scraper blade 506. Under normal conditions, the connecting spring 504 is in a naturally extended or slightly compressed state, so that the scraper blade 506 is located near the bottom end of the multi-row jet pipes 505. When the multi-row jet pipes 505 are pressed into the soil, the scraper blade 506 slides upward relative to the ground resistance and compresses the connecting spring 504. When the multi-row jet pipes 505 are pulled out, the connecting spring 504 uses the restoring force to push the scraper blade 506 downward to reset and complete the self-cleaning action.

[0032] As another preferred embodiment, in order to further optimize the penetration ability of the multi-row jet pipe 505 into compacted soil and prevent the air outlet from being blocked, the end of the multi-row jet pipe 505 away from the connector 503 is processed into a conical tip structure. The conical tip can convert vertical pressure into lateral force, making it easier to penetrate hard soil layers. The diameter of several air outlet holes opened on the side wall of the multi-row jet pipe 505 near the bottom is designed to be smaller than the inner diameter of the air guide pipe 9, thereby forming a micro-pressure jet effect and increasing the diffusion radius of steam in the soil.

[0033] As another preferred embodiment, in order to ensure safety and durability during the high-temperature steam transportation process, the air guide pipe 9 is made of high-temperature resistant corrugated hose. The corrugated structure gives it excellent flexibility and fatigue resistance, and it can adapt to the frequent up-and-down reciprocating motion of the connector 503 without bending fatigue fracture. The two ends of the air guide pipe 9 are fastened to the interfaces of the steam generator 3 and the connector 503 respectively by pipe clamps to prevent the interfaces from loosening due to steam pressure fluctuations.

[0034] As a final preferred embodiment, in order to realize the intelligent and convenient operation of the device, the control panel set on one side of the fixed plate 1 integrates a microprocessor and a relay module. The control panel is electrically connected to the motor 703, the steam generator 3 and the drive motor of the drive gear 507 in the soil crushing mechanism 7 through cables. The operator can independently control the start and stop of the crushing operation, the temperature and pressure of the steam generated and the lifting depth of the steam injection mechanism through the buttons on the control panel.

[0035] Working principle: In actual operation, the operator holds the handle 2 and pushes the fixed plate 1 to move it above the compacted soil to be repaired via the bottom moving wheels 4. First, the soil crushing mechanism 7 is started through the control panel. The motor 703 drives the rotating shaft 704 and crushing teeth 702 to rotate at high speed, and performs rotary tillage and crushing pretreatment on the compacted surface soil. The mudguard 701 effectively blocks the splashed soil clods during this process. After the surface soil is loosened, the drive motor is started through the control panel to drive the movable gear 507 to rotate.

[0036] The movable gear 507 meshes with the teeth on the side of the movable connecting column 502, driving the movable connecting column 502 to slide vertically downward smoothly within the square guide groove of the fixed housing 501. The movable connecting column 502 drives the connector 503 at the bottom to descend synchronously. At this time, the connector 503 slides along the surface of the movable connecting rod 6. The movable connecting rod 6 restricts the circumferential rotation of the connector 503 and ensures the verticality of the pressing process. As the connector 503 continues to descend, the multi-row jet pipes 505 at the bottom use their conical tips to pierce into the pulverized soil.

[0037] During this downward pressing process, the scraper 506, which is fitted onto the multi-row jet pipe 505, first contacts the soil surface and stops descending due to obstruction. Meanwhile, the connector 503 continues to drive the multi-row jet pipe 505 deeper into the soil, shortening the distance between the connector 503 and the scraper 506. This compresses the connecting spring 504, which accumulates elastic potential energy. When the multi-row jet pipe 505 reaches the predetermined depth, the high-temperature and high-pressure steam generated by the steam generator 3 is transported to the connector 503 through the air guide pipe 9 made of high-temperature resistant corrugated hose material, and finally ejected from the air outlet on the side wall of the multi-row jet pipe 505, performing comprehensive fumigation and disinfection on the deep soil.

[0038] After the disinfection operation is completed, the control gear 507 reverses to drive the movable connecting column 502 and connector 503 to move upward and reset. During the process of the multi-row air pipe 505 being pulled out of the soil, the compressed connecting spring 504 releases its elastic potential energy, keeping the scraper 506 pressed tightly against the soil surface or moving downward relative to the rising multi-row air pipe 505. This causes the inner wall of the scraper 506 to slide tightly against the outer wall of the multi-row air pipe 505, forcibly scraping off the wet soil adhering to the pipe wall. This prevents the soil from drying and clogging the air outlet or hindering the next insertion, until the connector 503 is fully reset. Then the device can move to the next work point.

Claims

1. A soil steam sterilization device for agricultural land remediation, comprising a fixed plate (1), wherein columns (8) are fixedly installed at the four corners of the bottom of the fixed plate (1), and the bottom ends of the columns (8) are rotatably connected to casters (4); and a handrail (2) and a steam generator (3) are fixedly installed on the top of the fixed plate (1); characterized in that, A soil crushing mechanism (7) is fixedly installed on one side of the bottom of the fixed plate (1), and an active disinfection mechanism (5) is installed in the middle. The active disinfection mechanism (5) includes a fixed housing (501) bolted to the top of the fixed plate (1), a toothed movable connecting column (502) vertically slidably connected inside the fixed housing (501), and a movable gear (507) meshing with the toothed gear rotatably connected to the side of the fixed housing (501); the bottom end of the movable connecting column (502) passes through the fixed plate (1) and is fixedly connected to a connector (503), the bottom of the connector (503) is connected to multiple rows of jet pipes (505), and a movable connecting rod (6) for guidance is connected between the connector (503) and the fixed plate (1); The steam generator (3) is connected to the connector (503) via a gas pipe (9) at its outlet.

2. The soil steam sterilization device for agricultural land remediation according to claim 1, characterized in that, A scraper (506) is slidably sleeved on the outer wall of the multi-row jet pipe (505), and a connecting spring (504) is connected between the scraper (506) and the connector (503). The connecting spring (504) is sleeved on the outer periphery of the multi-row jet pipe (505).

3. The soil steam sterilization device for agricultural land remediation according to claim 1, characterized in that, The soil crushing mechanism (7) includes a motor (703) fixedly installed on the side wall of the column (8). The output shaft of the motor (703) is fixedly connected to a rotating shaft (704) with several crushing teeth (702). A mudguard (701) fixed on the column (8) is provided above the rotating shaft (704).

4. The soil steam sterilization device for agricultural land remediation according to claim 1, characterized in that, One end of the movable connecting rod (6) is welded and fixed to the bottom of the fixed plate (1), and the other end is slidably inserted into the guide hole of the connector (503) and slidably engaged with the connector (503).

5. The soil steam sterilization device for agricultural land remediation according to claim 1, characterized in that, The end of the multi-row jet pipe (505) away from the connector (503) has a conical pointed structure, and the side wall of the multi-row jet pipe (505) has several air outlet holes near the bottom.

6. The soil steam sterilization device for agricultural land remediation according to claim 2, characterized in that, The scraper (506) is a rectangular metal plate. The scraper (506) has several through holes that correspond one-to-one with the multi-row jet pipes (505). The inner wall of the through holes is tightly fitted to the outer wall of the multi-row jet pipes (505).

7. The soil steam sterilization device for agricultural land remediation according to claim 2, characterized in that, The two ends of the connecting spring (504) are fixedly connected to the bottom surface of the connector (503) and the top surface of the scraper (506), respectively.

8. The soil steam sterilization device for agricultural land remediation according to claim 1, characterized in that, The air guide tube (9) is a high-temperature resistant corrugated hose, and the length of the air guide tube (9) is greater than the maximum vertical stroke of the movable connecting column (502). The two ends of the air guide tube (9) are fixed by pipe clamps.

9. The soil steam sterilization device for agricultural land remediation according to claim 1, characterized in that, The movable connecting column (502) has a rectangular cross-section, and the fixed outer shell (501) has a rectangular guide hole at its center that matches the movable connecting column (502).

10. The soil steam sterilization device for agricultural land remediation according to claim 1, characterized in that, The fixed plate (1) is also provided with a control panel on one side, which is electrically connected to the soil crushing mechanism (7) and the steam generator (3).

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