A microbial degradation device for soil remediation

Abstract

This invention relates to the field of soil remediation technology, specifically to a microbial degradation device for soil remediation, comprising a conveying section, a spraying section, and a mixing section. The conveying section includes a conveyor belt. The spraying section includes nozzles located above the conveyor belt for spraying microbial agents onto the soil on the conveyor belt. The mixing section includes a vertically arranged mixing tank, a stirring element, and a drive element that drives the stirring element to rotate and mix the soil in the mixing tank. The stirring element includes a rotating shaft connected to the output shaft of the drive element and a spiral blade fixedly connected to the rotating shaft. A hollow channel is provided along the axis of the rotating shaft. Several exhaust channels are provided on the stirring element. One end of the exhaust channel penetrates the surface of the spiral blade, and the other end of the exhaust channel communicates with the hollow channel. An external gas source is sealed and connected to the hollow channel. This solution can improve the dispersion uniformity of microorganisms and auxiliary gases in the soil.

Description

Technical Field

[0001] This invention relates to the field of soil remediation technology, and more specifically to a microbial degradation device for soil remediation. Background Technology

[0002] To increase crop yields and income, large amounts of chemical fertilizers and pesticides are used, leading to severe pollution of the soil, with excessive levels of organic matter. This pollution is difficult to repair naturally, resulting in soil compaction, poor growing conditions, and crop failure. To ensure the normal function of the soil and achieve sustainable use, artificial intervention is typically used for soil remediation. Ex-situ microbial degradation remediation is a commonly used artificial soil remediation method. It involves excavating contaminated soil, initially removing impurities and breaking it up, and then placing it in a microbial degradation device for centralized processing. By injecting microbial agents into the soil, stirring, introducing auxiliary gases, and heating, the pollutants are brought into full contact with the microorganisms, increasing their activity. The microorganisms then decompose the organic pollutants in the soil through metabolic activity, converting them into harmless substances such as carbon dioxide and water, thus achieving the goal of soil remediation. Existing microbial degradation devices typically involve placing soil with added microbial agents into a mixing tank and introducing auxiliary gas into the tank. A rotating stirring rod then mixes the microbial agents with the soil within the tank. In this simple mixing method of introducing gas into the mixing tank and stirring, the gas cannot penetrate into the middle part of the soil pile, resulting in a small contact area between the gas, soil, and microorganisms. This leads to poor mixing and dispersion between the soil, microorganisms, and auxiliary gas, thus reducing the rate of microbial degradation and remediation. Summary of the Invention

[0003] In view of the shortcomings of the prior art, the technical problem to be solved by the present invention is to provide a microbial degradation device for soil remediation, so as to solve the problem that the existing microbial degradation devices have poor mixing and dispersion effects between soil, microorganisms and auxiliary gas, which reduces the rate of microbial degradation and remediation.

[0004] To solve the above-mentioned technical problems, one technical solution adopted by the present invention is: a microbial degradation device for soil remediation, comprising a conveying unit, a spraying unit, and a mixing unit;

[0005] The conveying unit includes a conveyor belt, and the spraying unit includes nozzles located above the conveyor belt for spraying microbial agents onto the soil on the conveyor belt.

[0006] The mixing section includes a vertically arranged mixing tank, a mixing element, and a drive element for driving the mixing element to rotate and mix the soil in the mixing tank. The mixing element includes a rotating shaft coaxially arranged with the mixing tank and a spiral blade fixedly connected to the rotating shaft. A hollow channel is provided inside the rotating shaft along the axis of the rotating shaft. Several exhaust channels are provided on the mixing element. One end of the exhaust channel penetrates the surface of the spiral blade, and the other end of the exhaust channel communicates with the hollow channel. An external air source is sealed and connected to the hollow channel.

[0007] In the above scheme, the pre-screened and crushed soil is placed on a conveyor belt, which then sends the soil sprayed with microbial agent into the mixing tank. The drive unit drives the rotating shaft to rotate, which in turn drives the spiral blades to rotate. The rotating spiral blades continuously push the soil at the bottom of the mixing tank upwards and then fall back to the bottom of the mixing tank through the space near the inner wall of the mixing tank. At the same time, since the outlet ends of the multi-point dispersed exhaust channels are covered by soil during mixing, the auxiliary gas enters the soil in the mixing tank through the multiple exhaust channels on the spiral blades, which improves the dispersion effect of the auxiliary gas in the soil.

[0008] Compared to mixing soil with a stirring rod, in this scheme, the spiral blades can push the soil upwards and downwards for a longer distance during mixing, and the auxiliary gas is introduced into the soil through multiple dispersed exhaust channels. Therefore, the above scheme improves the uniformity of microorganisms and gases in the soil.

[0009] Furthermore, the mixing tank is a vertically arranged cylinder with an open top. The lower section of the mixing tank is a circular straight cylinder, and the upper section is a conical cylinder. The spiral blades are continuously distributed spirally around the rotating shaft and are configured to cooperate with the inner wall of the mixing tank. The lowest end of the spiral blades is horizontally provided with a circular support plate that slides and cooperates with the inner wall of the lower section of the mixing tank. The circular support plate is fixedly connected to the rotating shaft. The mixing part also includes a second driving component for driving the rotating shaft to move vertically.

[0010] Furthermore, the second driving component includes a telescopic cylinder first disposed below the mixing tank. The lower end of the rotating shaft passes downward through the bottom plate of the mixing tank and is coaxially rotatably connected to the output shaft of the telescopic cylinder first. The rotating shaft is slidably connected to the bottom plate of the mixing tank.

[0011] Furthermore, the driving component includes a mounting plate disposed above the mixing tank and a drive motor disposed on the mounting plate, a driving gear coaxially and fixedly connected to the output shaft of the drive motor, and a driven gear meshing with the driving gear and coaxially disposed with the rotating shaft. The mounting plate is horizontally disposed and fixedly connected to other fixing components. The driven gear is rotatably connected to the mounting plate. A spline hole is provided inside the driven gear along its axis. The upper end of the rotating shaft is provided with an external spline section that slides with the spline hole. A through hole is provided on the mounting plate to allow the rotating shaft to pass through.

[0012] Furthermore, the upper end of the hollow channel is open, and the open end of the hollow channel is coaxially sealed and rotatably connected to a rotary joint. An external gas source is connected to the rotary joint through a gas pipe to introduce auxiliary gas into the hollow channel.

[0013] Furthermore, a slide bar is vertically mounted on the mounting plate, and a slide plate is horizontally mounted on the slide bar. One end of the slide plate is fitted over the slide bar and slidably connected to the slide bar, while the other end of the slide plate is fixedly connected to the rotary joint.

[0014] Furthermore, the mixing section also includes an outer cylinder fitted outside the mixing tank. The outer cylinder is a cylindrical body with an open top. The upper end face of the outer cylinder is located in the space above the mixing tank. The inner wall of the outer cylinder is separated from the outer wall of the mixing tank. The mixing tank is fixedly connected to the inner wall of the outer cylinder by a support rod one. The telescopic cylinder one is fixedly connected to the inner wall of the mixing tank by a support rod two.

[0015] Furthermore, the lower inner cavity of the outer cylinder is provided with a storage box for collecting the mixed soil. The storage box is a circular cylinder with an open top and slidingly fitted with the lower inner wall of the outer cylinder. A reset member is provided between the storage box and the inner bottom wall of the outer cylinder. A telescopic cylinder II is provided on the outer cylinder to control the sliding of the storage box. The lower inner cavity of the outer cylinder is connected to the rotary joint through an air pipe II.

[0016] Furthermore, a three-way fitting is provided on the air inlet of the rotary joint. One-way valve one and one-way valve two are respectively provided on port one and port two of the three-way fitting. Port three of the three-way fitting is sealed and fixedly connected to the air inlet of the rotary joint. Air pipe one is connected to the rotary joint through one-way valve one, and air pipe two is connected to the rotary joint through one-way valve two.

[0017] Furthermore, the exhaust channel is inclined downwards, with its outlet end extending downwards through the lower surface of the spiral blade, and its inlet end connected to the hollow channel. This downward-inclined arrangement prevents fine soil particles from accumulating and clogging the hollow channel within the rotating shaft under gravity.

[0018] In the above scheme, the output shaft of the telescopic cylinder one is controlled to retract, causing the rotating shaft to move downward, so that a certain gap is created between the spiral blade and the inner wall of the mixing tank, and the uppermost spiral blade is located in the space below the opening of the mixing tank. Under the elastic force of the reset component, the storage box is located in the space above the telescopic cylinder two. At this time, the output shaft of the telescopic cylinder two can be controlled to extend into the lower part of the storage box inside the outer cylinder to prevent the storage box from sliding downward.

[0019] The pre-screened and crushed soil is placed on a conveyor belt, which then feeds the soil sprayed with microbial agents into a mixing drum. A drive motor rotates the shaft, which in turn rotates the spiral blades to agitate the soil. The rotating spiral blades continuously push the soil from the bottom of the mixing drum upwards and then back down through the gap between the spiral blades and the inner wall of the drum, achieving repeated mixing and improving the dispersion of microorganisms in the soil, resulting in more uniform distribution. During soil mixing, a measured amount of auxiliary gas is introduced through an air pipe into the hollow channel within the shaft. Because the outlets of the multiple exhaust channels are covered by soil during mixing, the auxiliary gas enters the soil within the mixing drum through multiple exhaust channels on the spiral blades, further enhancing its dispersion.

[0020] After the soil, microorganisms, and auxiliary gas are mixed in the mixing tank to achieve the preset effect, the control telescopic cylinder drives the rotating shaft to gradually rise, causing the gap between the spiral blades and the inner wall of the mixing tank to gradually narrow until the soil can no longer fall down through the gap. At this time, the uppermost spiral blade extends out of the mixing tank opening. As the spiral blades continue to rotate, the soil in the mixing tank is continuously pushed upwards, flips over the opening of the mixing tank, and falls into the outer cylinder until all the soil in the mixing tank is discharged by the spiral blades, at which point the drive motor can be stopped.

[0021] The mixed soil that falls through the opening at the top of the mixing drum into the outer cylinder will accumulate in the storage box in the lower inner cavity of the outer cylinder. At this time, the storage box filled with soil cannot slide down due to the obstruction of the output shaft of the telescopic cylinder two. After all the soil in the mixing drum has fallen into the storage box, the output shaft of the telescopic cylinder two is contracted, causing the storage box filled with a large amount of soil to move down rapidly under gravity. The reset component is squeezed and stored. The rapidly moving storage box quickly compresses the gas in the space below the storage box in the outer cylinder to generate high-pressure gas. The high-pressure gas enters the hollow channel in the rotating shaft through the second air pipe and is quickly ejected from the spiral blades through each exhaust channel, flushing away the soil particles that were blocked in the exhaust channel during soil mixing, so that the exhaust channel can smoothly introduce auxiliary gas into the soil during the next mixing.

[0022] After the storage box moves down to the bottom of the outer cylinder, its upper surface is positioned below and close to the output shaft of the second telescopic cylinder. At this point, controlling the output shaft of the second telescopic cylinder to extend into the outer cylinder prevents the storage box from rising, thus preventing it from moving upwards under the elastic force of the reset component during the removal of the mixed soil. Once the soil is removed, the output shaft of the second telescopic cylinder is retracted again, and the storage box moves upwards back to its original position under the elastic force of the reset component. Then, the output shaft of the second telescopic cylinder is extended to prevent the storage box from sliding down and to await reloading of soil.

[0023] Compared with existing technologies that use mixing rollers to mix soil, this solution has at least the following advantages:

[0024] Beneficial effects:

[0025] 1. In this scheme, the size of the gap between the spiral blade and the inner wall of the mixing drum can be adjusted by controlling the upward or downward movement of the drive shaft of the telescopic cylinder according to soil parameters such as mixing speed and soil viscosity. This controls the rate at which the soil falls back when it is pushed upward by the spiral blade, allowing the soil to be pushed to a high position before falling back to the bottom space of the mixing drum, increasing the flow path of the soil. Meanwhile, the auxiliary gas is infiltrated into the soil through multi-point dispersed exhaust channels. Therefore, the above scheme improves the uniformity of dispersion of microorganisms and gases in the soil.

[0026] 2. In this scheme, after the soil is mixed and stirred, high-pressure gas is generated to flush and clean the exhaust channel of the added auxiliary gas, preventing the exhaust channel from becoming blocked.

[0027] 3. In this design, the conical mixing tank is combined with the conical spiral blades. In addition to controlling the rate at which the soil falls back into the mixing tank, the conical mixing tank and the conical spiral blades also allow the soil in the mixing tank to be discharged from the opening at the top of the mixing tank. This eliminates the need for additional valves at the bottom of the mixing tank and additional components and equipment to control the opening and closing of these valves, making the manufacturing of the mixing tank simpler. Attached Figure Description

[0028] The accompanying drawings, which are included to provide a further understanding of this application and form part of this application, illustrate exemplary embodiments and are used to explain this application, but do not constitute an undue limitation of this application. In the drawings:

[0029] Figure 1 This is a schematic diagram of the front view of a microbial degradation device for soil remediation according to the present invention. Figure 1 .

[0030] Figure 2 for Figure 1 Enlarged view of section A.

[0031] Figure 3 for Figure 1 Enlarged view of section B in the middle.

[0032] Figure 4 for Figure 1 Enlarged view of section C.

[0033] Figure 5 A schematic diagram of the structure from the front view of the invention of a microbial degradation device for soil remediation. Figure 2 .

[0034] The meanings of the labels in the attached diagram are as follows:

[0035] Conveying Unit-10;

[0036] Spraying section -20;

[0037] Mixing section-30; Stirring tank-31;

[0038] Rotating shaft - 321; Spiral blade - 322; Hollow channel - 3211; External spline section - 3212; Exhaust channel - 323; Circular support plate - 324; Telescopic cylinder one - 325; Rotating seat - 3251;

[0039] Mounting plate - 331; Through hole 1 - 3310; Drive motor - 332; Drive gear - 333; Driven gear - 334; Spline hole - 3341; Support column - 335;

[0040] Outer cylinder -34; Support rod one -341; Support rod two -342; Door leaf two -343;

[0041] Rotary joint-41; Air hose 1-42; Slide rod-43; Slide plate-44; Air hose 2-45; T-fitting-46; One-way valve 1-461; One-way valve 2-462;

[0042] Storage box-50; Door leaf one-501; Spring-51; Telescopic cylinder two-52. Detailed Implementation

[0043] To make the objectives, technical solutions, and advantages of this application clearer, the technical solutions of this application will be clearly and completely described below in conjunction with specific embodiments and corresponding drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of them. Based on the embodiments in this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0044] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used herein in the description of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention.

[0045] This embodiment provides a microbial degradation device for soil remediation, such as... Figures 1-5 As shown, it includes a conveying unit 10, a spraying unit 20, and a mixing unit 30.

[0046] The conveying unit 10 includes a conveyor belt, and the spraying unit 20 includes a nozzle located above the conveyor belt for spraying microbial agents onto the soil on the conveyor belt. Both the conveyor belt and the nozzle adopt existing conventional technologies, which will not be described in detail here.

[0047] The mixing unit 30 includes a vertically arranged mixing tank 31, a mixing element, a drive element 1 for driving the mixing element to rotate and mix the soil inside the mixing tank 31, a drive element 2 for driving the mixing element to move vertically, and an outer cylinder 34 sleeved outside the mixing tank 31 with a gap between it and the mixing tank 31. The mixing tank 31 is a vertically arranged cylinder with an open top. The lower section of the mixing tank 31 is a circular straight cylinder, and the upper section of the mixing tank 31 is a conical cylinder. The bottom plate of the mixing tank 31 and the side wall of the mixing tank 31 can be detached and then fixedly connected to the side wall of the mixing tank 31 by bolts. This facilitates the installation of the mixing element inside the mixing tank 31 and the maintenance and cleaning of the inside of the mixing tank 31.

[0048] The mixing component includes a rotating shaft 321 coaxially arranged with the mixing tank 31 and a spiral blade 322 fixedly connected to the rotating shaft 321. The spiral blade 322 is continuously distributed spirally around the rotating shaft 321 and is configured to cooperate with the inner wall of the mixing tank 31. A circular support plate 324 is horizontally arranged at the lowermost end of the spiral blade 322. The circular support plate 324 is sleeved on the rotating shaft 321 and fixedly connected to the rotating shaft 321. The circular support plate 324 slides in cooperation with the lower inner wall of the mixing tank 31 to prevent soil from flowing into the mixing tank 31 below the circular support plate 324. A hollow channel 3211 is coaxially arranged within the rotating shaft 321 along its axis. The upper end of the hollow channel 3211 is open, meaning that the upper end of the hollow channel 3211 extends upward through the upper end face of the rotating shaft 321. The open end of the hollow channel 3211 is coaxially and rotatably connected to a rotary joint 41. An external gas source is connected to the rotary joint 41 via a gas pipe 42 to introduce auxiliary gas into the hollow channel 3211. Figure 1 , Figure 3As shown, the stirring component is provided with a plurality of exhaust channels 323. One end of the exhaust channel 323 penetrates the surface of the spiral blade 322, and the other end of the exhaust channel 323 is connected to the hollow channel 3211. Specifically, the exhaust channel 323 is inclined downward, the exhaust end of the exhaust channel 323 is inclined downward and penetrates the lower surface of the spiral blade 322, and the intake end of the exhaust channel 323 is connected to the hollow channel 3211.

[0049] The outer cylinder 34 is coaxially arranged with the mixing tank 31. The outer cylinder 34 is an open-top cylindrical body. The upper section of the outer cylinder 34 is a conical cylinder that matches the upper section of the mixing tank 31, and the lower section is a circular straight cylinder. The upper end face of the outer cylinder 34 is located in the space above the mixing tank 31, that is, the open end of the outer cylinder 34 is higher than the open end of the mixing tank 31. A gap is left between the inner wall of the outer cylinder 34 and the outer wall of the mixing tank 31. The mixing tank 31 is fixedly connected to the inner wall of the outer cylinder 34 by a first support rod 341. Multiple first support rods 341 are evenly distributed circumferentially on the inner wall of the outer cylinder 34 located below the mixing tank 31. All first support rods 341 are fixedly connected to the inner wall of the outer cylinder 34. The bottom plate of the mixing tank 31 is fixedly connected to the first support rod 341. A second support rod 342 is fixedly connected to the inner wall of the outer cylinder 34 below the first support rod 341.

[0050] The second driving component includes a telescopic cylinder 325 mounted on the second support rod 342 below the mixing tank 31. The telescopic cylinder 325 can be a pneumatic, hydraulic, or electric telescopic cylinder, with a hydraulic cylinder being preferred. An external hydraulic cylinder is connected to the telescopic cylinder 325 to control the extension and retraction of its output shaft. The telescopic cylinder 325 is coaxially mounted with the rotating shaft 321, and its output shaft faces upwards. Figure 1 , Figure 4 As shown, a rotating seat 3251 is fixedly connected to the output of the telescopic cylinder 325. The lower end of the rotating shaft 321 passes downward through the bottom plate of the mixing tank 31 and is rotatably connected to the rotating seat 3251 on the output shaft of the telescopic cylinder 325. The rotating shaft 321 is slidably connected to the bottom plate of the mixing tank 31.

[0051] like Figure 1 , Figure 2As shown, the driving component includes a mounting plate 331 disposed above the mixing tank 31, a drive motor 332 disposed on the mounting plate 331, a driving gear 333 coaxially fixedly connected to the output shaft of the drive motor 332, and a driven gear 334 meshing with the driving gear 333 and coaxially disposed with the rotating shaft 321. The mounting plate 331 is horizontally disposed and fixedly connected to the upper end of the support column 335, and the lower end of the support column 335 is fixedly connected to the ground. The drive motor 332 is mounted on the upper surface of the mounting plate 331 and is externally connected to a power supply and controller. The output shaft of motor 332 passes vertically downward through mounting plate 331. The driving gear 333 is located below mounting plate 331 and is coaxially and fixedly connected to the output shaft of drive motor 332. The driven gear 334 is rotatably connected to mounting plate 331 and coaxially arranged with shaft 321. A spline hole 3341 is provided along the axis of the driven gear 334. The spline hole 3341 is a through hole. The upper end of shaft 321 has an external spline section 3212 that slides with the spline hole 3341. Mounting plate 331 has a through hole 3310 for shaft 321 to pass through. A sliding rod 43 is vertically mounted on mounting plate 331, with its lower end fixedly connected to mounting plate 331. A sliding plate 44 is horizontally mounted on sliding rod 43. One end of the sliding plate 44 is fitted over sliding rod 43 and slidably connected to it, while the other end is fixedly connected to rotary joint 41. A three-way fitting 46 is provided on the air inlet of the rotary joint 41. One-way valve 461 and one-way valve 462 are respectively installed at port one and port two of the three-way fitting 46. Port three of the three-way fitting 46 is sealed and fixedly connected to the air inlet of the rotary joint 41. Air pipe 42 is connected to the rotary joint 41 through one-way valve 461. One end of air pipe 42 is connected to an external air source for providing auxiliary gas, and the other end of air pipe 42... The first check valve 461 is connected to the first check valve 461, which allows gas to flow from the first air pipe 42 through the first check valve 461 to the rotary joint 41. The second check valve 462 is provided with a second air pipe 45. One end of the second air pipe 45 is connected to the lower inner cavity of the outer cylinder 34, and the other end of the second air pipe 45 is connected to the second check valve 462. The second check valve 462 allows gas to flow from the second air pipe 45 through the second check valve 462 to the rotary joint 41.

[0052] like Figure 1As shown, the lower inner cavity of the outer cylinder 34 is provided with a storage box 50 for collecting the mixed soil. The storage box 50 is a circular cylinder with an open top and slidingly fitted to the lower inner wall of the outer cylinder 34. A spring 51 is vertically arranged between the storage box 50 and the inner bottom wall of the outer cylinder 34. The upper end of the spring 51 is fixedly connected to the bottom plate of the storage box 50, and the lower end of the spring 51 is fixedly connected to the bottom plate of the outer cylinder 34. At least two telescopic cylinders 52 are evenly distributed circumferentially on the outer wall of the outer cylinder 34. In this example, three telescopic cylinders 52 are evenly distributed circumferentially on the outer wall of the outer cylinder 34. In other embodiments, other numbers of telescopic cylinders 52 can be flexibly set according to the specifications of the device, which will not be listed here. Cylinder 2 52 can be a pneumatic telescopic cylinder, a hydraulic telescopic cylinder, or an electric telescopic rod, preferably an electric telescopic rod. All telescopic cylinders 2 52 are externally powered and have a controller for controlling the synchronous extension and retraction of the output shafts of all telescopic rods 2. The output shaft of telescopic cylinder 2 52 is arranged radially along the outer cylinder 34. The side wall of the outer cylinder 34 is provided with a through hole that mates with the output shaft of telescopic cylinder 2 52 to allow the output shaft of telescopic cylinder 2 52 to extend into the outer cylinder 34. When the storage box 50 is not filled with soil, under the elastic force of the spring 51, the storage box 50 is located in the space above telescopic cylinder 2 52. At this time, the output shaft of telescopic cylinder 2 52 can be controlled to extend into the lower part of the storage box 50 inside the outer cylinder 34 to prevent the storage box 50 from sliding downward.

[0053] To facilitate the removal of soil from the storage box 50, a door opening 1 for removing soil from the storage box 50 is provided on the side wall of the storage box 50. A door leaf 501 for opening / closing the door opening 1 is provided on the door opening 1. A door opening 2 is provided on the lower side wall of the outer cylinder 34, aligned with the door opening 1. A door leaf 343 for opening / closing the door opening 2 is provided on the door opening 2.

[0054] It is understood that the auxiliary gases in this scheme include, but are not limited to, gases such as oxygen, nitrogen, and hot air.

[0055] When using the above scheme, first control the output shaft of telescopic cylinder 325 to retract, causing the rotating shaft 321 to move downward, so that a certain gap is created between the spiral blade 322 and the inner wall of the mixing tank 31, and the uppermost spiral blade 322 is located in the internal space of the mixing tank 31. Under the elastic force of spring 51, the storage box 50 is located in the space above the telescopic cylinder 52. At this time, the output shaft of telescopic cylinder 52 can be controlled to extend into the outer cylinder 34 below the storage box 50 to prevent the storage box 50 from sliding downward.

[0056] The pre-screened and crushed soil is placed on a conveyor belt, which then feeds the soil sprayed with microbial agent into the mixing tank 31. The drive motor 332 drives the rotating shaft 321 to rotate, which in turn rotates the spiral blades 322 to agitate the soil. The rotating spiral blades 322 continuously push the soil from the bottom of the mixing tank 31 towards the upper interior space of the mixing tank 31, and then back down through the gap between the spiral blades 322 and the inner wall of the mixing tank 31 to the bottom space of the mixing tank 31, achieving repeated agitation and improving the dispersion of microorganisms in the soil, resulting in more uniform microbial distribution. During soil agitation, a fixed amount of auxiliary gas is introduced through the air pipe 42 and the rotary joint 41 into the hollow channel 3211 inside the rotating shaft 321. Since the outlets of the multi-point distributed exhaust channels 323 are located in the soil pile during agitation, the auxiliary gas enters the soil inside the mixing tank 31 through the multiple exhaust channels 323 on the spiral blades 322, further improving the dispersion of the auxiliary gas in the soil.

[0057] After the soil, microorganisms, and auxiliary gas are mixed in the mixing tank 31 to achieve the preset effect, the telescopic cylinder 325 is controlled to push the rotating shaft 321 to gradually rise, so that the gap between the spiral blade 322 and the inner wall of the mixing tank 31 gradually narrows until the soil can no longer fall down through the gap. At this time, the uppermost spiral blade 322 moves upward and extends out of the opening of the mixing tank 31. As the spiral blade 322 rotates continuously, the soil in the mixing tank 31 is continuously pushed upward, flips over the opening of the mixing tank 31, and falls into the outer cylinder 34. The drive motor 332 can be stopped after all the soil in the mixing tank 31 has been discharged by the spiral blade 322.

[0058] The mixed soil that falls through the opening at the top of the mixing drum 31 into the outer cylinder 34 will accumulate in the storage box 50 in the lower inner cavity of the outer cylinder 34. At this time, due to the obstruction of the output shaft of the telescopic cylinder 52, the storage box 50 filled with soil cannot slide downwards. Figure 5 As shown, after all the soil in the mixing tank 31 falls into the storage tank 50, the output shafts of each telescopic cylinder 52 are synchronously contracted, causing the storage tank 50, which is loaded with a large amount of soil, to move rapidly downward under gravity. The spring 51 is compressed and stores energy. The rapidly moving storage tank 50 quickly compresses the gas in the space below the storage tank 50 in the outer cylinder 34, generating high-pressure gas. The high-pressure gas enters the hollow channel 3211 in the rotating shaft 321 through the second air pipe 45 and is quickly ejected from the spiral blades 322 through each exhaust channel 323, flushing away the soil particles that were blocked in the exhaust channel 323 during soil mixing, so that auxiliary gas can be smoothly introduced into the soil through the exhaust channel 323 during the next mixing.

[0059] After the storage box 50 moves down to the bottom of the outer cylinder 34, its upper surface is located below and close to the output shaft of the telescopic cylinder 52. At this point, controlling the output shaft of the telescopic cylinder 52 to extend into the outer cylinder 34 can prevent the storage box 50 from rising, thus preventing it from moving upwards under the force of the spring 51 during the removal of the mixed soil. After the soil in the storage box 50 is removed, the output shaft of the telescopic cylinder 52 is retracted again, and the storage box 50 moves upwards back to its original position under the force of the spring 51. Then, the output shaft of the telescopic cylinder 52 is extended to prevent the storage box 50 from sliding down and to wait for reloading of the mixed soil.

[0060] The above are merely embodiments of the present invention, and common knowledge regarding specific structures and characteristics in the solutions is not described in detail here. It should be noted that those skilled in the art can make various modifications and improvements without departing from the structure of the present invention, and these should also be considered within the scope of protection of the present invention. These modifications and improvements will not affect the effectiveness of the implementation of the present invention or the practicality of the patent. The scope of protection claimed in this application should be determined by the content of its claims, and the specific embodiments described in the specification can be used to interpret the content of the claims.

Claims

1. A microbial degradation device for soil remediation, comprising a conveying section (10), a spraying section (20), and a mixing section (30), wherein the conveying section (10) includes a conveyor belt, and the spraying section (20) includes nozzles located above the conveyor belt for spraying microbial agents onto the soil on the conveyor belt, characterized in that: The mixing section (30) includes a vertically arranged mixing tank (31), a mixing element, and a driving element for driving the mixing element to rotate to mix the soil in the mixing tank (31). The mixing element includes a rotating shaft (321) coaxially arranged with the mixing tank (31) and a spiral blade (322) fixedly connected to the rotating shaft (321). A hollow channel (3211) is arranged inside the rotating shaft (321) along the axis of the rotating shaft (321). A plurality of exhaust channels (323) are arranged on the mixing element. One end of the exhaust channel (323) penetrates the surface of the spiral blade (322), and the other end of the exhaust channel (323) is connected to the hollow channel (3211). An external air source is sealed and connected to the hollow channel (3211). The mixing tank (31) is a vertically arranged cylindrical body with an open top. The lower section of the mixing tank (31) is a circular straight cylinder, and the upper section of the mixing tank (31) is a conical cylinder. The spiral blades (322) are spirally and continuously distributed around the rotating shaft (321) and are configured to cooperate with the inner wall of the mixing tank (31). The lowest end of the spiral blades (322) is horizontally provided with a circular support plate (324) that slides and cooperates with the inner wall of the lower section of the mixing tank (31). The circular support plate (324) is fixedly connected to the rotating shaft (321). The mixing part (30) also includes a second driving member for driving the rotating shaft (321) to move in the vertical direction.

2. The microbial degradation device for soil remediation according to claim 1, characterized in that: The second driving component includes a telescopic cylinder (325) disposed below the mixing tank (31). The lower end of the rotating shaft (321) passes downward through the bottom plate of the mixing tank (31) and is coaxially rotatably connected to the output shaft of the telescopic cylinder (325). The rotating shaft (321) is slidably connected to the bottom plate of the mixing tank (31).

3. The microbial degradation device for soil remediation according to claim 2, characterized in that: The drive component includes a mounting plate (331) disposed above the mixing tank (31) and a drive motor (332) disposed on the mounting plate (331), a drive gear (333) coaxially fixedly connected to the output shaft of the drive motor (332), and a driven gear (334) meshing with the drive gear (333) and coaxially disposed with the rotating shaft (321). The mounting plate (331) is horizontally disposed and fixedly connected to other fixing components. The driven gear (334) is rotatably connected to the mounting plate (331). A spline hole (3341) is provided in the driven gear (334) along its axis. The upper end of the rotating shaft (321) is provided with an external spline section (3212) that slides with the spline hole (3341). The mounting plate (331) is provided with a through hole (3310) for the rotating shaft (321) to pass through.

4. A microbial degradation device for soil remediation according to claim 3, characterized in that: The upper end of the hollow channel (3211) is open, and the open end of the hollow channel (3211) is coaxially sealed and rotatably connected to the rotary joint (41). An external gas source is connected to the rotary joint (41) through a gas pipe (42) to introduce auxiliary gas into the hollow channel (3211).

5. A microbial degradation device for soil remediation according to claim 4, characterized in that: A slide rod (43) is vertically mounted on the mounting plate (331), and a slide plate (44) is horizontally mounted on the slide rod (43). One end of the slide plate (44) is sleeved outside the slide rod (43) and slidably connected to the slide rod (43), while the other end of the slide plate (44) is fixedly connected to the rotary joint (41).

6. A microbial degradation device for soil remediation according to claim 5, characterized in that: The mixing section (30) also includes an outer cylinder (34) sleeved outside the mixing tank (31). The outer cylinder (34) is a cylinder with an open top. The upper end face of the outer cylinder (34) is located in the space above the mixing tank (31). The inner wall of the outer cylinder (34) is separated from the outer wall of the mixing tank (31). The mixing tank (31) is fixedly connected to the inner wall of the outer cylinder (34) by a support rod (341). The telescopic cylinder (325) is fixedly connected to the inner wall of the mixing tank (31) by a support rod (342).

7. A microbial degradation device for soil remediation according to claim 6, characterized in that: The lower inner cavity of the outer cylinder (34) is provided with a storage box (50) for collecting the mixed soil. The storage box (50) is a circular cylinder with an open top and slidingly engaged with the lower inner wall of the outer cylinder (34). A reset member is provided between the storage box (50) and the inner bottom wall of the outer cylinder (34). A telescopic cylinder (52) is provided on the outer cylinder (34) to control the sliding of the storage box (50). The lower inner cavity of the outer cylinder (34) is connected to the rotary joint (41) through an air pipe (45).

8. A microbial degradation device for soil remediation according to claim 7, characterized in that: A three-way fitting (46) is provided on the air inlet of the rotary joint (41). One-way valve one (461) and one-way valve two (462) are respectively provided on port one and port two of the three-way fitting (46). Port three of the three-way fitting (46) is sealed and fixedly connected to the air inlet of the rotary joint (41). Air pipe one (42) is connected to the rotary joint (41) through one-way valve one (461). Air pipe two (45) is connected to the rotary joint (41) through one-way valve two (462).

9. A microbial degradation device for soil remediation according to claim 1, characterized in that: The exhaust channel (323) is inclined downward, and the outlet end of the exhaust channel (323) is inclined downward and penetrates the lower surface of the spiral blade (322). The inlet end of the exhaust channel (323) is connected to the hollow channel (3211).

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