An ex situ infrared thermal desorption device for contaminated soil

Abstract

The present invention discloses an ex situ infrared thermal desorption device for contaminated soil, which relates to the field of soil remediation technology. The device comprises a shell, a soil holding mechanism is provided inside the shell, a soil laying mechanism is movably provided inside the soil holding mechanism, a bottom sealing mechanism is provided at the bottom of the soil holding mechanism, an infrared heating mechanism is provided at the top of the soil holding mechanism, and a feeding and exhaust mechanism is provided at the top of the shell; the soil holding mechanism comprises a limit frame, a convex plate, a fixing frame, a reciprocating screw, a motor and a T-shaped plate; the limit frame is fixedly provided on the inner side of the bottom plate, and both ends of the inner side of the limit frame are provided with a holding groove. The present invention can complete the soil tiling operation more conveniently and accurately complete the soil pollutant content detection operation during the tiling process to avoid overheating, effectively reducing the difficulty of tiling, improving the tiling efficiency, and effectively reducing the energy consumption of the equipment.

Description

Technical Field

[0001] The present invention relates to the technical field of soil remediation, and in particular to an ex-situ infrared thermal desorption device for contaminated soil. Background Art

[0002] Thermal desorption remediation technology is a process that heats contaminated soil to a sufficient temperature through direct or indirect heating to volatilize or separate the organic pollutants it contains. There are many heating methods suitable for thermal desorption remediation technology. Compared with traditional heating methods such as high-frequency current, microwaves, superheated air or combustion gas, infrared heating has the advantages of high heating efficiency, strong penetration, directional local heating, precise temperature control, and selective heating of certain components in the soil medium.

[0003] For example, the utility model patent with authorization announcement number CN219464330U discloses an ex situ infrared thermal desorption device for petroleum-contaminated soil, including a heating system, a monitoring system, a control system, and an extraction system.

[0004] When the above-mentioned ex situ infrared thermal desorption device for contaminated soil performs thermal desorption remediation on contaminated soil, there is no need to throw or lift the soil during the heating process, which effectively reduces the complexity and energy consumption of the equipment. However, when the above-mentioned equipment is used to remediate contaminated soil, the soil needs to be spread flat on the soil conveyor belt. Not only does it need to be laid flat, but it is also necessary to prevent the soil from falling from both sides of the soil conveyor belt during the laying process. There are certain operational difficulties, and the laying efficiency is not ideal.

[0005] Therefore, it is necessary to invent an ex situ infrared thermal desorption device for contaminated soil to solve the above problems. Summary of the Invention

[0006] The purpose of the present invention is to provide an ex situ infrared thermal desorption device for contaminated soil, which can complete the soil paving operation more conveniently and accurately complete the soil pollutant content detection operation during the paving process to avoid overheating, effectively reducing the paving difficulty and improving the paving efficiency, while effectively reducing the energy consumption of the equipment, so as to solve the problem proposed in the above background technology that when repairing contaminated soil, the soil needs to be spread onto a soil conveyor belt. Not only does it need to be laid flat, but it is also necessary to prevent the soil from falling from both sides of the soil conveyor belt during the paving process. There are certain operational difficulties and the paving efficiency is not ideal.

[0007] To achieve the above-mentioned object, the present invention provides the following technical solution: an ex situ infrared thermal desorption device for contaminated soil, comprising a housing, a soil holding mechanism disposed within the housing, a soil laying mechanism movably disposed within the soil holding mechanism, a bottom sealing mechanism disposed at the bottom of the soil holding mechanism, an infrared heating mechanism disposed at the top of the soil holding mechanism, and a feeding and exhaust mechanism disposed at the top of the housing;

[0008] The soil holding mechanism includes a limit frame, a convex plate, a fixing frame, a reciprocating screw, a motor and a T-shaped plate;

[0009] The limit frame is fixedly arranged on the inner side of the bottom plate, and both ends of the inner side of the limit frame are provided with accommodating grooves, two convex plates are provided, and the two reciprocating screws are respectively fixedly arranged on the two ends of the top of the limit frame, and four fixing frames are provided. The four limit frames are respectively fixedly arranged at the four corners of the limit frame, and the reciprocating screw is rotatably arranged between two adjacent fixing frames through a bearing, and the motor is fixedly arranged on the outside of the adjacent fixing frames and is transmission-connected to the adjacent reciprocating screws, and the T-shaped plate is sleeved on the outside of the reciprocating screw and slidably fits with the outer wall of the limit frame, and the T-shaped plate is transmission-connected to the reciprocating screw;

[0010] The soil laying mechanism includes a laying cover, a guide net, a transmission pipe, a sliding shaft, a first spring and a detection assembly;

[0011] The paving cover is located on the inner side of the adjacent accommodating groove and is slidably arranged on the inner side of the limit frame. The guide net is fixedly arranged on the inner side of the bottom opening of the paving cover in an inclined shape. The transmission pipe is fixedly passed through the top of the paving cover and is connected to the bottom outlet of the soil feed hopper. The sliding shaft is fixedly arranged at the end of the paving cover and is slidably arranged on the inner side of the T-shaped plate. The first spring is fixedly connected between the paving cover and the T-shaped plate. The detection component is arranged on the top of the paving cover.

[0012] Preferably, the shell includes a bottom plate, an outer cover, a base and a guide plate, the outer cover is fixedly arranged on the top of the bottom plate, the base is fixedly arranged on the bottom of the bottom plate, and there are two guide plates, which are respectively fixedly arranged at the two ends of the inner side of the base.

[0013] Preferably, the detection assembly includes a rotating shaft, a gear, a rotating plate and a rack. The rotating shaft is rotatably nested in the top of the paving cover through a bearing. The gear is fixedly sleeved on the outer bottom of the rotating shaft. The rotating plate is fixedly sleeved on the outer top of the rotating shaft. An infrared detection device for detecting the pollutant content in contaminated soil is fixed on the side of the rotating plate away from the rotating shaft. The output end of the infrared detection device is connected to a controller. The rack is engaged with the side of the gear and is slidably arranged on the top of the paving cover. A guide groove is provided on the inner side of the rack. A T-shaped guide slider fixedly connected to the paving cover is slidably provided on the inner side of the guide groove.

[0014] Preferably, the bottom sealing mechanism includes a sealing plate, a movable shaft and four sets of traction components. The sealing plate is attached to the bottom of the limit frame. There are two movable shafts, and the two movable shafts are rotatably arranged at both ends of the sealing plate through bearings.

[0015] Preferably, any group of the traction components includes a connecting block, a traction rope, a fixed block, a guide rod, a second spring and a movable block, the connecting block is fixedly sleeved on the outer end of the movable shaft, the traction rope is fixedly connected between the connecting block and the movable block, the fixed block is fixedly set on the top of the base plate, the guide rod slides through the fixed block, the second spring is sleeved on the outside of the guide rod and is located between the fixed block and the movable block, and the movable block is fixedly set at the end of the guide rod.

[0016] Preferably, the infrared heating mechanism includes a top plate, an infrared heating tube and a hydraulic cylinder. The top plate is located at the top inner side of the outer cover. There are multiple infrared heating tubes, and the multiple infrared heating tubes are evenly fixed at the bottom of the top plate and are all controlled to open and close by a controller. The hydraulic cylinder is fixed at the top of the outer cover and its output shaft is fixedly connected to the top plate.

[0017] Preferably, the feed and exhaust mechanism includes a soil feed hopper, a heat exchange coil, a first exhaust pipe, a second exhaust pipe and an extraction pump. The soil feed hopper is fixedly nested on the top of the outer cover, the heat exchange coil is fixedly arranged on the inner side of the soil feed hopper, the first exhaust pipe is fixedly connected to the output end of the heat exchange coil, the output end of the first exhaust pipe is connected to the exhaust gas treatment equipment, the second exhaust pipe is fixedly penetrated through the top of the outer cover and connected to the input end of the heat exchange coil, and the extraction pump is arranged on the second exhaust pipe.

[0018] Technical effects and advantages of the present invention:

[0019] The present invention is provided with a soil containing mechanism and a soil laying mechanism, so that the soil containing mechanism can be used to drive the soil laying mechanism to evenly lay the soil on the top of the bottom sealing mechanism. During the laying process, the soil containing mechanism is limited by the soil around the soil. At the same time, after the laying is completed, the soil containing mechanism can trigger the soil laying mechanism, and then adjust the position of the infrared detection device on the soil laying mechanism to ensure that the infrared detection device can complete the pollutant content detection operation after the soil is laid. Compared with the existing technology, the present invention can complete the soil paving operation more conveniently and accurately complete the soil pollutant content detection operation during the paving process to avoid overheating, thereby effectively reducing the laying difficulty, improving the laying efficiency, and effectively reducing the energy consumption of the equipment.

[0020] The present invention can automatically output the soil after soil treatment is completed, avoiding the factors such as long time consumption, easy residue, and large temperature influence in manual operation.

[0021] The present invention utilizes the soil to be processed inside the soil feed hopper to absorb heat in the exhaust gas, thereby reducing the exhaust gas temperature to make it easier to process, and also preheating the soil, thereby shortening the subsequent heating time and further reducing the energy consumption of the equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a schematic diagram of the overall structure of the present invention.

[0023] Figure 2 It is a schematic diagram of the shell structure of the present invention.

[0024] Figure 3 It is a structural schematic diagram of the soil containing mechanism and the soil laying mechanism of the present invention.

[0025] Figure 4 It is a schematic structural diagram of the bottom sealing mechanism of the present invention.

[0026] Figure 5 It is a schematic structural diagram of the infrared heating mechanism and the feeding and exhaust mechanism of the present invention.

[0027] In the figure: 1. housing; 11. bottom plate; 12. outer cover; 13. base; 14. guide plate; 2. soil holding mechanism; 21. limit frame; 22. convex plate; 23. fixing frame; 24. reciprocating screw; 25. motor; 26. T-shaped plate; 3. soil laying mechanism; 31. laying cover; 32. guide net; 33. transmission pipe; 34. sliding shaft; 35. first spring; 36. rotating shaft; 37. gear; 38. rotating plate; 39 , rack; 4. Bottom sealing mechanism; 41. Sealing plate; 42. Movable shaft; 43. Connecting block; 44. Traction rope; 45. Fixed block; 46. Guide rod; 47. Second spring; 48. Moving block; 5. Infrared heating mechanism; 51. Top plate; 52. Infrared heating tube; 53. Hydraulic cylinder; 6. Feed and exhaust mechanism; 61. Soil feed hopper; 62. Heat exchange coil; 63. First exhaust pipe; 64. Second exhaust pipe; 65. Extraction pump. DETAILED DESCRIPTION

[0028] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0029] Example 1

[0030] The present invention provides Figure 1-Figure 5 The device shown is an ex situ infrared thermal desorption device for contaminated soil, comprising an outer shell 1, a soil containing mechanism 2 being provided inside the outer shell 1, a soil laying mechanism 3 being movably provided inside the soil containing mechanism 2, a bottom sealing mechanism 4 being provided at the bottom of the soil containing mechanism 2, an infrared heating mechanism 5 being provided at the top of the soil containing mechanism 2, and a feeding and exhaust mechanism 6 being provided at the top of the outer shell 1.

[0031] like Figure 2 As shown, the housing 1 includes a bottom plate 11, an outer cover 12, a base 13 and a guide plate 14, wherein the outer cover 12 is fixedly arranged on the top of the bottom plate 11, the base 13 is fixedly arranged on the bottom of the bottom plate 11, and two guide plates 14 are provided, and the two guide plates 14 are respectively fixedly arranged at the two ends of the inner side of the base 13.

[0032] By setting the above structure, the treated soil can slide along the inclined sealing plate 41 to the top of the right guide plate 14, and then the guide plate 14 outputs it.

[0033] like Figure 3 As shown, the soil accommodating mechanism 2 includes a limit frame 21, a protruding plate 22, a fixing frame 23, a reciprocating screw 24, a motor 25 and a T-shaped plate 26, wherein the limit frame 21 is fixedly arranged on the inner side of the bottom plate 11, and both ends of the inner side of the limit frame 21 are provided with a accommodating groove, there are two protruding plates 22, and the two reciprocating screws 24 are respectively fixed at the two ends of the top of the limit frame 21, and there are four fixing frames 23. The four limit frames 21 are respectively fixed at the four corners of the limit frame 21, and the reciprocating screw 24 is rotatably arranged between two adjacent fixing frames 23 through bearings. The motor 25 is fixedly arranged on the outside of the adjacent fixing frames 23 and is transmission-connected to the adjacent reciprocating screws 24. The T-shaped plate 26 is sleeved on the outside of the reciprocating screw 24 and slides in contact with the outer wall of the limit frame 21, and the T-shaped plate 26 is transmission-connected to the reciprocating screw 24.

[0034] like Figure 3 As shown, the soil laying mechanism 3 includes a laying cover 31, a guide net 32, a transmission pipe 33, a sliding shaft 34, a first spring 35 and a detection component, wherein the laying cover 31 is located on the inner side of the adjacent accommodating groove and is slidably arranged on the inner side of the limit frame 21, the guide net 32 is fixedly arranged on the inner side of the bottom opening of the laying cover 31 in an inclined shape, the transmission pipe 33 is fixedly penetrated and arranged on the top of the laying cover 31 and is connected to the bottom outlet of the soil feed hopper 61, the sliding shaft 34 is fixedly arranged at the end of the laying cover 31 and is slidably arranged on the inner side of the T-shaped plate 26, the first spring 35 is fixedly connected between the laying cover 31 and the T-shaped plate 26, and the detection component is arranged on the top of the laying cover 31.

[0035] By setting the above structure, the soil can enter the paving cover 31 along the transmission pipe 33, so that the motor 25 drives the reciprocating screw 24 to rotate. When the reciprocating screw 24 rotates, it drives the T-shaped plate 26 to continuously move right. When the T-shaped plate 26 moves right, the paving cover 31 is driven to move right by the first spring 35. During the rightward movement of the paving cover 31, it moves out from the inner side of the adjacent accommodating groove. After the paving cover 31 moves out from the inner side of the accommodating groove, the bottom opening of the paving cover 31 is no longer blocked. At this time, the soil continues to pass through the diversion net 32 and falls onto the top of the sealing plate 41, thereby realizing the soil flattening operation. The setting of the inclined diversion net 32 can both guide the soil entering the paving cover 31 and ensure that the soil falls normally.

[0036] like Figure 3 As shown, the detection assembly includes a rotating shaft 36, a gear 37, a rotating plate 38 and a rack 39, wherein the rotating shaft 36 is rotatably nested in the top of the paving cover 31 through a bearing, the gear 37 is fixedly sleeved on the outer bottom of the rotating shaft 36, and the rotating plate 38 is fixedly sleeved on the outer top of the rotating shaft 36. An infrared detection device for detecting the pollutant content in contaminated soil is fixed on the side of the rotating plate 38 away from the rotating shaft 36, and the output end of the infrared detection device is connected to a controller. The rack 39 is engaged with the side of the gear 37 and is slidably set on the top of the paving cover 31. A guide groove is provided on the inner side of the rack 39, and a T-shaped guide slider fixedly connected to the paving cover 31 is slidably provided on the inner side of the guide groove.

[0037] By setting the above structure, after the end of the rack 39 contacts the convex plate 22 at the top right end of the limit frame 21, as the paving cover 31 continues to move to the right, the convex plate 22 pushes the rack 39, thereby causing the rack 39 to slide along the T-shaped guide slider. During this process, the gear 37 drives the rotating plate 38 to rotate through the rotating shaft 36, and then the rotating plate 38 drives the infrared detection equipment to rotate to the other side of the paving cover 31, so as to facilitate the pollutant content detection operation during the next soil paving process.

[0038] like Figure 4 As shown, the bottom sealing mechanism 4 includes a sealing plate 41, a movable shaft 42 and four sets of traction components, wherein the sealing plate 41 is attached to the bottom of the limit frame 21, and two movable shafts 42 are provided. The two movable shafts 42 are respectively rotatably arranged at both ends of the sealing plate 41 through bearings.

[0039] like Figure 4As shown, any group of the traction components includes a connecting block 43, a traction rope 44, a fixed block 45, a guide rod 46, a second spring 47 and a movable block 48, wherein the connecting block 43 is fixedly sleeved on the outer end of the movable shaft 42, the traction rope 44 is fixedly connected between the connecting block 43 and the movable block 48, the fixed block 45 is fixedly set on the top of the base plate 11, the guide rod 46 slides through the fixed block 45, the second spring 47 is sleeved on the outside of the guide rod 46 and is located between the fixed block 45 and the movable block 48, and the movable block 48 is fixedly set at the end of the guide rod 46.

[0040] By setting up the above structure, after the T-shaped plate 26 pushes the moving block 48, the moving block 48 compresses the second spring 47 under the guidance of the guide rod 46, and at the same time relaxes the traction rope 44. At this time, the right end of the sealing plate 41 is detached from the bottom of the bottom plate 11, and the processed soil on the top of the sealing plate 41 slides along the inclined sealing plate 41 to the top of the right guide plate 14, and is then output by the guide plate 14. After the soil treatment is completed, the soil can be automatically output, avoiding the factors such as long time consumption, easy residue, and greater temperature influence of manual operation.

[0041] like Figure 5 As shown, the infrared heating mechanism 5 includes a top plate 51, an infrared heating tube 52 and a hydraulic cylinder 53, wherein the top plate 51 is located at the top inner side of the outer cover 12, and a plurality of infrared heating tubes 52 are provided. The plurality of infrared heating tubes 52 are evenly fixed at the bottom of the top plate 51 and are all controlled to open and close by a controller. The hydraulic cylinder 53 is fixed at the top of the outer cover 12 and its output shaft is fixedly connected to the top plate 51.

[0042] like Figure 5 As shown, the feeding and exhaust mechanism 6 includes a soil feeding hopper 61, a heat exchange coil 62, a first exhaust pipe 63, a second exhaust pipe 64 and an extraction pump 65, wherein the soil feeding hopper 61 is fixedly nested at the top of the outer cover 12, the heat exchange coil 62 is fixedly arranged on the inner side of the soil feeding hopper 61, the first exhaust pipe 63 is fixedly connected to the output end of the heat exchange coil 62, the output end of the first exhaust pipe 63 is connected to the exhaust gas treatment equipment, the second exhaust pipe 64 is fixedly penetrated at the top of the outer cover 12 and connected to the input end of the heat exchange coil 62, and the extraction pump 65 is arranged on the second exhaust pipe 64.

[0043] By setting up the above structure, the treated soil can be added into the soil feed hopper 61 from the top opening of the soil feed hopper 61, and the soil enters the paving cover 31 along the transmission pipe 33. The subsequent extraction pump 65 extracts the waste gas containing volatile organic pollutants from the bottom plate 11 through the second exhaust pipe 64 and inputs it into the heat exchange coil 62. The soil to be treated in the soil feed hopper 61 thus exchanges heat with the waste gas, thereby completing preheating to shorten the time required for subsequent heating. The waste gas after heat exchange is input into the exhaust gas treatment equipment through the first exhaust pipe 63. Since the waste gas has been cooled, the treatment difficulty is further reduced.

[0044] Example 2

[0045] The present invention also discloses a method for using an ex-situ infrared thermal desorption device for contaminated soil, comprising the following steps:

[0046] S1. Screening out gravel and plant roots in the soil to be treated;

[0047] S2. The treated soil is added into the soil feed hopper 61 through the top opening. The soil enters the paving cover 31 along the transmission pipe 33, causing the motor 25 to drive the reciprocating screw 24 to rotate. The reciprocating screw 24 rotates and drives the T-shaped plate 26 to continuously move rightward. When the T-shaped plate 26 moves rightward, the paving cover 31 is driven rightward via the first spring 35. During the rightward movement, the paving cover 31 moves out from the inner side of the adjacent receiving groove.

[0048] S3. After the paving cover 31 is removed from the inside of the receiving groove, the bottom opening of the paving cover 31 is no longer blocked. At this time, the soil continues to pass through the diversion net 32 and falls onto the top of the sealing plate 41. During this process, the limit frame 21 is limited by the soil around the soil. At the same time, the infrared detection equipment on the rotating plate 38 continues to detect the pollutant content in the soil under the drive of the paving cover 31;

[0049] S4. As the paving cover 31 continues to move, the end of the rack 39 contacts the convex plate 22 at the top right end of the limit frame 21. When the paving cover 31 continues to move to the right, the convex plate 22 pushes the rack 39, causing the rack 39 to slide along the T-shaped guide slider. During this process, the gear 37 drives the rotating plate 38 to rotate via the rotating shaft 36, and the rotating plate 38 drives the infrared detection device to rotate to the other side of the paving cover 31, facilitating the pollutant content detection operation during the next soil paving process.

[0050] S5. When the paving cover 31 moves to the inner side of the receiving groove at the inner right end of the limiting frame 21, the bottom opening of the paving cover 31 is closed again. At the same time, due to the obstruction of the receiving groove, the paving cover 31 cannot continue to move right. Subsequently, as the T-shaped plate 26 continues to move right, the first spring 35 is stretched.

[0051] S6. The hydraulic cylinder 53 drives the top plate 51 downward, thereby moving the plurality of infrared heating tubes 52 closer to the laid soil. After the plurality of infrared heating tubes 52 reach the heating position, the controller controls the plurality of infrared heating tubes 52 to turn on. At the same time, the opening time of each infrared heating tube 52 is set according to the detection results of the infrared detection equipment. As the infrared heating tubes 52 continue to heat, the organic pollutants in the soil are volatilized due to the increase in temperature.

[0052] S7: The extraction pump 65 extracts the exhaust gas containing volatile organic pollutants from the bottom plate 11 through the second exhaust pipe 64 and inputs it into the heat exchange coil 62. The soil to be treated in the soil feed hopper 61 thus exchanges heat with the exhaust gas, thereby completing preheating and shortening the time required for subsequent heating. The exhaust gas after heat exchange is input into the exhaust gas treatment equipment through the first exhaust pipe 63. Since the exhaust gas has been cooled, the treatment difficulty is further reduced.

[0053] S8, the T-shaped plate 26 contacts the moving block 48 due to movement and pushes the moving block 48. The moving block 48 compresses the second spring 47 under the guidance of the guide rod 46, and at the same time relaxes the traction rope 44. At this time, the right end of the sealing plate 41 is separated from the bottom of the bottom plate 11. The processed soil on the top of the sealing plate 41 slides along the inclined sealing plate 41 to the top of the right guide plate 14, and is then discharged by the guide plate 14.

[0054] S9, after the T-shaped plate 26 moves to the rightmost end of the reciprocating screw 24, it begins to move left and reset under the drive of the reciprocating screw 24. During the left movement and reset process, the right end of the sealing plate 41 is synchronously reset and adheres to the bottom of the limit frame 21. Subsequently, as the T-shaped plate 26 continues to move left, the soil laying mechanism 3 again lays soil on the top of the sealing plate 41.

[0055] Finally, it should be noted that the above is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions described in the aforementioned embodiments or make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. An ex situ infrared thermal desorption device for contaminated soil, characterized by: The invention comprises a shell (1), a soil holding mechanism (2) is provided inside the shell (1), a soil laying mechanism (3) is movably provided inside the soil holding mechanism (2), a bottom sealing mechanism (4) is provided at the bottom of the soil holding mechanism (2), an infrared heating mechanism (5) is provided at the top of the soil holding mechanism (2), and a feeding and exhaust mechanism (6) is provided at the top of the shell (1); The soil holding mechanism (2) comprises a limiting frame (21), a convex plate (22), a fixing frame (23), a reciprocating screw (24), a motor (25) and a T-shaped plate (26); The limit frame (21) is fixedly arranged on the inner side of the bottom plate (11), and both ends of the inner side of the limit frame (21) are provided with a receiving groove. There are two convex plates (22), and the two reciprocating screws (24) are respectively fixedly arranged on the two ends of the top of the limit frame (21). There are four fixed frames (23), and the four limit frames (21) are respectively fixedly arranged at the four corners of the limit frame (21). The reciprocating screw (24) is rotatably arranged between two adjacent fixed frames (23) through a bearing. The motor (25) is fixedly arranged on the outside of the adjacent fixed frames (23) and is transmission-connected with the adjacent reciprocating screws (24). The T-shaped plate (26) is sleeved on the outside of the reciprocating screw (24) and is slidably fitted with the outer wall of the limit frame (21). The T-shaped plate (26) is transmission-connected with the reciprocating screw (24); The soil laying mechanism (3) comprises a laying cover (31), a diversion net (32), a transmission pipe (33), a sliding shaft (34), a first spring (35) and a detection assembly; The paving cover (31) is located inside the adjacent accommodating groove and is slidably arranged inside the limit frame (21); the guide net (32) is fixedly arranged inside the bottom opening of the paving cover (31) in an inclined shape; the transmission pipe (33) is fixedly arranged through the top of the paving cover (31) and is connected to the bottom outlet of the soil feed hopper (61); the sliding shaft (34) is fixedly arranged at the end of the paving cover (31) and is slidably arranged inside the T-shaped plate (26); the first spring (35) is fixedly connected between the paving cover (31) and the T-shaped plate (26); and the detection component is arranged on the top of the paving cover (31).

2. The ex situ infrared thermal desorption device for contaminated soil according to claim 1, characterized in that: The housing (1) comprises a bottom plate (11), an outer cover (12), a base (13) and a guide plate (14); the outer cover (12) is fixedly arranged on the top of the bottom plate (11); the base (13) is fixedly arranged on the bottom of the bottom plate (11); two guide plates (14) are provided, and the two guide plates (14) are respectively fixedly arranged on the two ends of the inner side of the base (13).

3. The ex situ infrared thermal desorption device for contaminated soil according to claim 2, characterized in that: The detection assembly includes a rotating shaft (36), a gear (37), a rotating plate (38) and a rack (39), wherein the rotating shaft (36) is rotatably nested on the top of the paving cover (31) through a bearing, the gear (37) is fixedly sleeved on the outer bottom of the rotating shaft (36), and the rotating plate (38) is fixedly sleeved on the outer top of the rotating shaft (36). An infrared detection device for detecting the content of pollutants in contaminated soil is fixed on the side of the rotating plate (38) away from the rotating shaft (36), and the output end of the infrared detection device is connected to a controller, the rack (39) is engaged with the side of the gear (37) and is slidably arranged on the top of the paving cover (31), and a guide slot is arranged on the inner side of the rack (39), and a T-shaped guide slider fixedly connected to the paving cover (31) is slidably arranged on the inner side of the guide slot.

4. The ex situ infrared thermal desorption device for contaminated soil according to claim 3, characterized in that: The bottom sealing mechanism (4) comprises a sealing plate (41), a movable shaft (42) and four groups of traction components. The sealing plate (41) is attached to the bottom of the limit frame (21). Two movable shafts (42) are provided. The two movable shafts (42) are rotatably arranged at both ends of the sealing plate (41) through bearings.

5. The ex situ infrared thermal desorption device for contaminated soil according to claim 4, characterized in that: Any group of the traction components comprises a connecting block (43), a traction rope (44), a fixed block (45), a guide rod (46), a second spring (47) and a moving block (48); the connecting block (43) is fixedly sleeved on the outer end of the movable shaft (42); the traction rope (44) is fixedly connected between the connecting block (43) and the moving block (48); the fixed block (45) is fixedly set on the top of the bottom plate (11); the guide rod (46) slides through the fixed block (45); the second spring (47) is sleeved on the outer side of the guide rod (46) and is located between the fixed block (45) and the moving block (48); and the moving block (48) is fixedly set at the end of the guide rod (46).

6. The ex situ infrared thermal desorption device for contaminated soil according to claim 5, characterized in that: The infrared heating mechanism (5) comprises a top plate (51), an infrared heating tube (52) and a hydraulic cylinder (53); the top plate (51) is located at the top of the inner side of the outer cover (12); a plurality of infrared heating tubes (52) are provided; the plurality of infrared heating tubes (52) are evenly fixedly arranged at the bottom of the top plate (51) and are all controlled to be opened and closed by a controller; the hydraulic cylinder (53) is fixedly arranged at the top of the outer cover (12) and its output shaft is fixedly connected to the top plate (51).

7. The ex situ infrared thermal desorption device for contaminated soil according to claim 6, characterized in that: The feed and exhaust mechanism (6) comprises a soil feed hopper (61), a heat exchange coil (62), a first exhaust pipe (63), a second exhaust pipe (64) and an extraction pump (65); the soil feed hopper (61) is fixedly nested on the top of the outer cover (12); the heat exchange coil (62) is fixedly arranged inside the soil feed hopper (61); the first exhaust pipe (63) is fixedly connected to the output end of the heat exchange coil (62); the output end of the first exhaust pipe (63) is connected to an exhaust gas treatment device; the second exhaust pipe (64) is fixedly arranged through the top of the outer cover (12) and connected to the input end of the heat exchange coil (62); and the extraction pump (65) is arranged on the second exhaust pipe (64).

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