Kiln body structure for thermal desorption repair of polluted soil

Abstract

The invention discloses a kiln body structure for polluted soil thermal desorption remediation, and belongs to the technical field of polluted soil treatment. Comprising an inner-layer barrel, the outer side of the inner-layer barrel is sleeved with an outer-layer barrel, a plurality of supporting assemblies are arranged between the inner-layer barrel and the outer-layer barrel, the supporting assemblies are used for connecting the inner-layer barrel and the outer-layer barrel, and the supporting assemblies are evenly distributed in the length direction of the inner-layer barrel. Each supporting assembly comprises four supporting blocks, the four supporting blocks are evenly arranged in the circumferential direction of the inner-layer barrel, every two adjacent supporting assemblies are staggered by 45 degrees in the circumferential direction, and the arc length of one supporting block is larger than one eighth of the perimeter of the inner surface of the outer-layer barrel and smaller than one fourth of the perimeter of the inner surface of the outer-layer barrel. According to the technical scheme, the problems that in the prior art, a rotary kiln is single in function and inconvenient to use for thermal desorption of contaminated soil are solved.

Description

Technical Field

[0001] The invention belongs to the technical field of contaminated soil treatment, and in particular relates to a kiln structure for thermal desorption and restoration of contaminated soil. Background Art

[0002] Soil thermal desorption is a technology used to remediate soil contaminated by organic pollutants. The core of this technology is to heat the soil to volatilize or separate the organic pollutants in the soil, and then collect and treat them. Thermal desorption technology can be divided into in-situ thermal desorption and ex-situ thermal desorption. In-situ thermal desorption is to heat the soil directly at the contaminated site, while ex-situ thermal desorption is to heat the contaminated soil at other places after digging it out.

[0003] In the ex situ thermal desorption process, the soil is usually heated by a rotary kiln. However, the use of rotary kilns in the prior art is relatively simple, either using a rotary kiln for direct heating (fuel and soil contact heating) or using a rotary kiln for indirect heating (hot air heats the soil). The direct heating or indirect heating mode cannot be selected according to the characteristics of the substance to be desorbed from the soil, which brings inconvenience to the thermal desorption of the soil. Summary of the invention

[0004] In view of this, the purpose of the present invention is to provide a kiln structure for thermal desorption and remediation of contaminated soil, so as to solve the problem that the rotary kiln in the prior art has a single function and is not convenient for use in thermal desorption of contaminated soil.

[0005] In order to achieve the above object, the present invention provides the following technical solutions: The present invention discloses a kiln body structure for thermal desorption and remediation of contaminated soil, comprising an inner cylinder, an outer cylinder being sleeved on the outer side of the inner cylinder, a plurality of groups of support assemblies being arranged between the inner cylinder and the outer cylinder, the support assemblies being used to connect the inner cylinder and the outer cylinder, the plurality of groups of support assemblies being evenly arranged along the length direction of the inner cylinder, one group of the support assemblies comprising four support blocks, the four support blocks being evenly arranged along the circumferential direction of the inner cylinder, two adjacent groups of the support assemblies being staggered by 45 degrees in the circumferential direction, the arc length of one support block being greater than one eighth of the circumference of the inner surface of the outer cylinder and less than one quarter of the circumference of the inner surface of the outer cylinder.

[0006] Furthermore, the outer cylinder is provided with a plurality of wheel belts, the inner ring of the wheel belts is fixed on the outer surface of the outer cylinder, a supporting pier is provided below the wheel belt, two groups of drive assemblies are arranged side by side on one of the supporting piers, one group of the drive assemblies includes a symmetrically arranged fixed plate, one end of the fixed plate is fixed on the supporting pier, a supporting wheel is provided between the two fixed plates, a rotating shaft is provided in the middle of the supporting wheel, the middle part of the supporting wheel is fixedly connected to the rotating shaft, both ends of the rotating shaft are rotatably connected to the other end of the fixed plate respectively, the wheel belt is placed on the supporting wheel, both ends of the rotating shaft extend to the outside of the fixed plate, and a driving motor is provided on the supporting pier, and the output shaft of the driving motor is connected to one end of the rotating shaft located outside the fixed plate.

[0007] Furthermore, circular baffles are provided on both end surfaces of the supporting roller, one side surface of the circular baffle is fixed to the end surface of the supporting roller, and the pulley is located between the two circular baffles, and the circular baffle is in sliding contact with the end surface of the pulley, a plurality of first baffles evenly distributed around the circumference are provided on the output shaft of the driving motor, a plurality of second baffles evenly distributed around the circumference are provided on one end of the rotating shaft connected to the driving motor, the positions of the plurality of first baffles and the plurality of second baffles are arranged in a one-to-one correspondence, a sliding cylinder is sleeved on the outer sides of the first baffles and the second baffles, a plurality of limit blocks are provided on the inner side surface of the sliding cylinder, the limit blocks are fixed on the sliding cylinder, and the plurality of first baffles and the plurality of second baffles are located within the installation spacing between adjacent limit blocks.

[0008] Furthermore, a first baffle is provided on the outer side of one end of the sliding cylinder close to the circular baffle, and the middle part of the first baffle is fixed on the rotating shaft. A second baffle is provided on the end of the sliding cylinder close to the driving motor, and the second baffle is fixed on the sliding cylinder. A third baffle is provided on the output shaft, and the middle part of the third baffle is fixed on the output shaft. A spring is provided between the third baffle and the second baffle, and the spring is sleeved on the output shaft, and both ends of the spring are respectively pressed against the second baffle and the third baffle.

[0009] Furthermore, a plurality of rollers are provided on the side surface of the circular baffle plate that contacts the end surface of the wheel band, and the rollers are rotatably connected to the circular baffle plate.

[0010] Furthermore, a cylindrical cylinder is provided below the sliding cylinder, and the cylindrical cylinder is fixed on the supporting pier, and a piston is provided inside the cylindrical cylinder, and two ends of the piston are respectively provided with a first push rod and a second push rod, and the first push rod and the second push rod are respectively provided with a first wedge block and a second wedge block, and the sliding cylinders arranged on the two groups of driving assemblies on the same supporting pier are respectively provided with a first push plate and a second push plate, and the first push plate and the second push plate are fixed on the outer surface of the sliding cylinder, and the first push plate contacts with the first wedge block to push the piston toward the second push plate, and the second push plate contacts with the second wedge block to push the piston toward the first push plate, and a first air pipe and a second air pipe are respectively provided at both ends of the cylindrical cylinder, one end of the first air pipe and the second air pipe are both connected to the interior of the cylindrical cylinder, and the other ends of the first air pipe and the second air pipe respectively point to the parts where the wheel belt is about to rotate and contact with the two supporting wheels.

[0011] Furthermore, a Y-shaped air pipe is provided on the other end of each of the first air pipe and the second air pipe, and two exhaust ends of the Y-shaped air pipe are respectively directed to the parts where the wheel belt and the supporting wheel are about to rotate and contact.

[0012] The beneficial effects of the present invention are: The kiln structure in the technical solution is a composite kiln structure, and when treating contaminated soil, direct heating or indirect heating can be selected according to the characteristics of the soil; when indirectly heating the contaminated soil, it is only necessary to introduce hot air between the inner cylinder and the outer cylinder at the end of the kiln, that is, the air flows in the gaps between the support blocks, thereby heating the inner cylinder, and then heating the contaminated soil in the inner cylinder, thereby achieving thermal desorption treatment of the soil; when directly heating the contaminated soil, it is only necessary to mix the heating fuel and the soil, and then add it directly from the end of the inner cylinder, and then the heating fuel is mixed with the contaminated soil in the inner cylinder for direct heating, and then the contaminated soil is subjected to thermal desorption treatment; The support block is set so that when the hot air is input between the inner cylinder and the outer cylinder, the flow direction of the hot air will be continuously blocked by the support block, thereby reducing the flow speed of the hot air, making the hot air stay longer between the inner cylinder and the outer cylinder, and making the heat exchange time between the hot air and the inner cylinder longer, that is, improving the heat utilization efficiency and ensuring the heating effect of the inner cylinder. At the same time, it is not difficult to understand that the hot air will continuously hit the support block during the flow process, which will make the hot air more evenly distributed between the inner cylinder and the outer cylinder.

[0013] Other advantages, objectives and features of the present invention will be described in the following description and will be apparent to those skilled in the art to some extent, or those skilled in the art may be taught from the practice of the present invention. The objectives and other advantages of the present invention may be realized and obtained through the following description. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] In order to make the purpose, technical solution and beneficial effects of the present invention clearer, the present invention provides the following drawings for illustration: Figure 1 It is a three-dimensional schematic diagram of the kiln structure of the present invention; Figure 2 It is a schematic diagram of an exploded view of the kiln structure of the present invention; Figure 3 It is a schematic diagram of the arrangement of the drive assembly of the present invention; Figure 4 It is a schematic internal perspective view of the driving assembly of the present invention; Figure 5 It is a three-dimensional schematic diagram of a sliding cylinder in a driving assembly of the present invention; Figure 6 A three-dimensional schematic diagram of a first wedge-shaped opening and a second wedge-shaped block provided at a driving assembly of the present invention; Figure 7 A three-dimensional schematic diagram of another perspective of providing a first wedge-shaped opening and a second wedge-shaped block at a driving assembly of the present invention; Figure 8 It is a schematic front view of a first wedge-shaped opening and a second wedge-shaped block provided at a driving assembly of the present invention.

[0015] The following are marked in the accompanying drawings: 1. Inner cylinder; 2. Outer cylinder; 3. Support block; 4. Wheel belt; 5. Support pier; 6. Driving motor; 7. Fixed plate; 8. Rotating shaft; 9. Support wheel; 10. Circular baffle plate; 11. Second baffle block; 12. Output shaft; 13. First baffle block; 14. First baffle plate; 15. Spring; 16. Third baffle plate; 17. Sliding cylinder; 18. Limit block; 19. Second baffle plate; 20. Columnar cylinder; 21. Piston; 22. First push rod; 23. First wedge block; 24. First push plate; 25. First air pipe; 26. Second push rod; 27. Second wedge block; 28. Second push plate; 29. ​​Second air pipe. DETAILED DESCRIPTION

[0016] like Figures 1 to 8As shown, a kiln structure for thermal desorption and remediation of contaminated soil of the present invention comprises an inner cylinder 1, an outer cylinder 2 is sleeved on the outer side of the inner cylinder 1, a plurality of groups of support assemblies are arranged between the inner cylinder 1 and the outer cylinder 2, the support assemblies are used to connect the inner cylinder 1 and the outer cylinder 2, the plurality of groups of support assemblies are evenly arranged along the length direction of the inner cylinder 1, one group of support assemblies comprises four support blocks 3, the four support blocks 3 are evenly arranged along the circumferential direction of the inner cylinder 1, two adjacent groups of support assemblies are staggered 45 degrees in the circumferential direction, and a support block 3 is arranged at a predetermined angle. The arc length is greater than one-eighth of the circumference of the inner surface of the outer cylinder 2 and less than one-quarter of the circumference of the inner surface of the outer cylinder 2. It should be noted that because two adjacent groups of support assemblies contain 8 support blocks 3, the arc length of each support block 3 is between one-eighth and one-quarter of the circular circumference of the cross-section of the outer cylinder 2, and the two adjacent groups of support assemblies are staggered by 45°. The staggered setting of 45° can be specifically understood as a rotation setting of 45°. The advantage of this is that, viewed from one end of the outer cylinder 2, the 8 support blocks 3 can be combined into a closed circle.

[0017] Furthermore, the kiln structure in the above technical solution is a composite kiln structure, and when treating contaminated soil, direct heating or indirect heating can be selected according to the characteristics of the soil; when the contaminated soil is indirectly heated, it is only necessary to introduce hot air between the inner cylinder 1 and the outer cylinder 2 at the end of the kiln body, that is, the air flows in the gaps between the support blocks 3, thereby heating the inner cylinder 1, and then heating the contaminated soil in the inner cylinder 1, thereby achieving thermal desorption treatment of the soil; when the contaminated soil is directly heated, it is only necessary to mix the heating fuel and the soil and then add it directly from the end of the inner cylinder 1, and then the heating fuel is mixed with the contaminated soil in the inner cylinder 1 for direct heating, and then the contaminated soil is subjected to thermal desorption treatment.

[0018] It should be particularly noted that the setting of the support block 3 makes it possible for the hot air to be continuously blocked by the support block 3 when the hot air is input between the inner cylinder 1 and the outer cylinder 2, thereby reducing the flow speed of the hot air, so that the hot air stays longer between the inner cylinder 1 and the outer cylinder 2, and the heat exchange time between the hot air and the inner cylinder 1 is prolonged, that is, the heat utilization efficiency is improved, and the heating effect of the inner cylinder 1 is ensured. At the same time, it is not difficult to understand that the hot air will continuously hit the support block 3 during the flow process, which will make the hot air more evenly distributed between the inner cylinder 1 and the outer cylinder 2.

[0019] It is also necessary to supplement the present solution that the kiln body structure should also include other structures, such as a heat-insulating lining provided on the inner wall of the outer cylinder 2, etc., which are prior arts and will not be elaborated in detail here.

[0020] In one practicable manner, a plurality of wheel belts 4 are provided on the outer cylinder 2, the inner ring of the wheel belt 4 is fixed on the outer surface of the outer cylinder 2, a supporting pier 5 is provided below the wheel belt 4, two groups of drive components are provided side by side on one supporting pier 5, one group of drive components includes a symmetrically arranged fixed plate 7, one end of the fixed plate 7 is fixed on the supporting pier 5, a supporting roller 9 is provided between the two fixed plates 7, a rotating shaft 8 is provided in the middle of the supporting roller 9, the middle part of the supporting roller 9 is fixedly connected to the rotating shaft 8, and both ends of the rotating shaft 8 are rotatably connected to the other end of the fixed plate 7 respectively, the wheel belt 4 is placed on the supporting roller 9, both ends of the rotating shaft 8 extend to the outside of the fixed plate 7, and a fixed driving motor 6 is provided on the supporting pier 5, and the output shaft 12 of the driving motor 6 is connected to one end of the rotating shaft 8 located outside the fixed plate 7.

[0021] The driving motor 6 drives the rotating shaft 8 to rotate through the output shaft 12, and then drives the supporting roller 9 to rotate. That is, the rotation of the supporting roller 9 will drive the wheel belt 4 to rotate under the action of friction force, and then drive the kiln body structure to rotate, thereby realizing rotary heating.

[0022] In an operative manner, circular baffles 10 are provided on both end surfaces of the supporting roller 9, one side surface of the circular baffle 10 is fixed on the end surface of the supporting roller 9, and the pulley is located between the two circular baffles 10, and the circular baffle 10 is in sliding contact with the end surface of the pulley, a plurality of circumferentially evenly distributed first baffles 13 are provided on the output shaft 12 of the driving motor 6, and a plurality of circumferentially evenly distributed second baffles 11 are provided on one end of the rotating shaft 8 connected to the driving motor 6, and the positions of the plurality of first baffles 13 and the plurality of second baffles 11 are set in one-to-one correspondence, and the one-to-one corresponding setting means that the number of settings is consistent and the setting positions are consistent, a sliding cylinder 17 is sleeved on the outer sides of the first baffles 13 and the second baffles 11, and a plurality of limit blocks 18 are provided on the inner side surface of the sliding cylinder 17, and the limit blocks 18 are fixed on the sliding cylinder 17, and the plurality of first baffles 13 and the plurality of second baffles 11 are located within the installation spacing between adjacent limit blocks 18.

[0023] The working principle of the above technical solution is: It should be noted that, due to the thermal expansion and contraction of the kiln body when the cold kiln rotates and the hot kiln rotates, the position of the wheel band 4 will change, so the contact position with the support roller 9 is not fixed. Over time, grooves will appear between the positions of the wheel band 4 that are frequently worn and the positions that are not frequently worn, causing the support roller 9 to be unable to be used normally.

[0024] Therefore, the wheel belt 4 is clamped by setting a circular baffle 10, and the setting method of the rotating shaft 8 can be specifically connected to the fixed plate 7 through a rotating bearing, while the rotating shaft 8 and the rotating bearing are not fixed, and the outer ring of the rotating bearing is fixed on the fixed plate 7, so the rotating shaft 8 can rotate and the inner ring of the rotating bearing can slide at the same time. Therefore, due to thermal expansion and contraction, the position of the wheel belt 4 changes and moves. Under the action of the circular baffle 10, it will drive the supporting wheel 9 to move together. Since the output shaft 12 of the drive motor 6 and the end of the rotating shaft 8 are transmitted power through the sliding cylinder 17, even if the rotating shaft 8 moves to a certain position, the output of the drive motor 6 will not be interrupted; since the first stop block 13 and the second stop block 11 are set between the limit block 18, when the first stop block 13 rotates with the output shaft 12, it will drive the sliding cylinder 17 to rotate, and then drive the second stop block 11 to rotate, and then drive the supporting wheel 9 to rotate.

[0025] The advantage of this arrangement is that it ensures that the contact surface between the wheel band 4 and the supporting roller 9 is constant, that is, the wear surface is constant, that is, there will be no problem of grooves on the surface of the supporting roller 9 due to different wear positions.

[0026] In one practicable manner, a first baffle 14 is provided on the outer side of one end of the sliding cylinder 17 close to the circular baffle 10, and the middle part of the first baffle 14 is fixed on the rotating shaft 8. A second baffle 19 is provided on the end of the sliding cylinder 17 close to the driving motor 6, and the second baffle 19 is fixed on the sliding cylinder 17. A third baffle 16 is provided on the output shaft 12, and the middle part of the third baffle 16 is fixed on the output shaft 12. A spring 15 is provided between the third baffle 16 and the second baffle 19, and the spring 15 is sleeved on the output shaft 12, and the two ends of the spring 15 are respectively tightly arranged on the second baffle 19 and the third baffle 16.

[0027] The benefit of the spring 15 is that when the support wheel 9 moves to the side away from the drive motor 6, the first block 13 will slide between the limit blocks 18, which will cause the first block 13 to partially slide out of the sliding cylinder 17, thereby reducing the contact area between the first block 13 and the limit block 18, resulting in a reduction in the load-bearing capacity of force transmission. At this time, the spring 15 will push the sliding cylinder 17 onto the third baffle 16, thereby increasing the contact area between the sliding cylinder 17 and the second block 11, thereby improving the force transmission effect. The function of the third baffle 16 is to limit the movement of the sliding cylinder 17, and the distance between the third baffle 16 and the fixed plate 7 is the sliding stroke of the rotating shaft 8.

[0028] In one feasible method, a plurality of rollers are provided on the side surface of the circular baffle 10 that contacts the end surface of the wheel band 4. The rollers are rotatably connected to the circular baffle 10. The setting of the rollers can reduce friction. The setting method of the rollers can refer to the setting method of the planar thrust bearing.

[0029] In one practicable manner, a columnar cylinder 20 is provided below the sliding cylinder 17, and the columnar cylinder 20 is fixed on the supporting pier 5. A piston 21 is provided inside the columnar cylinder 20, and a first push rod 22 and a second push rod 26 are provided at both ends of the piston 21, and a first wedge block 23 and a second wedge block 27 are provided on the first push rod 22 and the second push rod 26, respectively. The sliding cylinder 17 provided on the two sets of driving assemblies on the same supporting pier 5 is provided with a first push plate 24 and a second push plate 28, respectively, and the first push plate 24 and the second push plate 28 are fixed to the sliding cylinder 17. On the outer surface of the cylinder 17, the first push plate 24 contacts the first wedge block 23 to push the piston 21 toward the second push plate 28, and the second push plate 28 contacts the second wedge block 27 to push the piston 21 toward the first push plate 24. The first air pipe 25 and the second air pipe 29 are respectively provided at both ends of the cylindrical cylinder 20. One ends of the first air pipe 25 and the second air pipe 29 are connected to the interior of the cylindrical cylinder 20, and the other ends of the first air pipe 25 and the second air pipe 29 respectively point to the parts where the wheel belt 4 and the two supporting wheels 9 are about to rotate and contact.

[0030] like Figure 8 As shown, since the two sets of driving components are arranged side by side and facing the same direction, the two supporting wheels 9 rotate in the same direction, for example, they rotate clockwise, so the two sliding cylinders 17 must also rotate clockwise. Then how do the two clockwise rotating first push plates 24 and second push plates 28 realize the reciprocating motion of the piston 21? The specific structure is that the inclined surface of the first wedge block 23 is arranged in such a way that the upper end of the wedge surface is arranged close to the center line of the sliding cylinder 17, that is, when the first push plate 24 moves from the lower part of the inclined surface of the first wedge block 23 to the upper part, it will push the first wedge block 23 outward. , and then drive the piston 21 to move to the other end. The second wedge block 27 is set in such a way that the lower end of the wedge surface is set close to the axis of the sliding cylinder 17, and when the second support plate moves from the upper part to the lower part of the inclined surface of the second wedge block 27, the second push plate 28 will push the second wedge block 27 outward, thereby pushing the piston 21 to reset, thereby realizing the reciprocating motion of the piston 21. It is not difficult to understand that the first push plate 24 and the second push plate 28 are preferably staggered by 180°. The advantage of this is that the timing of the two moving the piston 21 is changed, so that the piston 21 can reciprocate. Of course, the setting position and setting angle of the first wedge block 23, the second wedge block 27, the first baffle 14 and the second baffle 19 and other components can be set according to actual conditions.

[0031] At the same time, the reciprocating piston 21 will compress the air inside, so that the compressed gas is discharged from the first air pipe 25 or the second air pipe 29. When the piston 21 moves, one air pipe exhausts and the other air pipe inhales. A dust removal cloth can be set at the end of the air pipe to prevent dust from entering. Then, the contact part between the belt 4 and the supporting wheel 9 that is about to rotate (such as Figure 8The surface of the first air pipe 25 and the second air pipe 29 (the end setting position) is purged to clean the foreign particles thereon to avoid damage to the contact surface between the two. Of course, the purging method can also cool the support wheel 9.

[0032] In one feasible manner, a Y-shaped air pipe is provided on the other end of the first air pipe 25 and the second air pipe 29, and the two exhaust ends of the Y-shaped air pipe respectively point to the parts where the wheel belt 4 and the support roller 9 are about to rotate and contact, and the two exhaust ends respectively purge the wheel belt 4 and the support roller 9 to improve the purge effect.

[0033] Finally, it should be noted that the above preferred embodiments are only used to illustrate the technical solutions of the present invention rather than to limit it. Although the present invention has been described in detail through the above preferred embodiments, those skilled in the art should understand that various changes can be made in form and details without departing from the scope defined by the claims of the present invention.

Claims

1. A kiln structure for thermal desorption and remediation of contaminated soil, characterized in that: The invention comprises an inner cylinder (1), an outer cylinder (2) being sleeved on the outer side of the inner cylinder (1), a plurality of groups of support assemblies being arranged between the inner cylinder (1) and the outer cylinder (2), the support assemblies being used to connect the inner cylinder (1) and the outer cylinder (2), the plurality of groups of support assemblies being evenly arranged along the length direction of the inner cylinder (1), one group of support assemblies comprising four support blocks (3), the four support blocks (3) being evenly arranged along the circumferential direction of the inner cylinder (1), two adjacent groups of support assemblies being staggered by 45 degrees in the circumferential direction, the arc length of one support block (3) being greater than one eighth of the circumference of the inner surface of the outer cylinder (2) and less than one quarter of the circumference of the inner surface of the outer cylinder (2).

2. The kiln structure for thermal desorption and remediation of contaminated soil according to claim 1, characterized in that: The outer cylinder (2) is provided with a plurality of wheel belts (4), the inner ring of the wheel belt (4) is fixed on the outer surface of the outer cylinder (2), a supporting pier (5) is provided below the wheel belt (4), and two groups of driving components are arranged side by side on one of the supporting piers (5), one group of the driving components comprises a symmetrically arranged fixed plate (7), one end of the fixed plate (7) is fixed on the supporting pier (5), a supporting wheel (9) is provided between the two fixed plates (7), a rotating shaft (8) is provided in the middle of the supporting wheel (9), the middle part of the supporting wheel (9) is fixedly connected to the rotating shaft (8), and the two ends of the rotating shaft (8) are respectively rotatably connected to the other end of the fixed plate (7), the wheel belt (4) is placed on the supporting wheel (9), and the two ends of the rotating shaft (8) extend to the outside of the fixed plate (7), and a driving motor (6) is provided on the supporting pier (5), and the output shaft (12) of the driving motor (6) is connected to one end of the rotating shaft (8) located outside the fixed plate (7).

3. The kiln structure for thermal desorption and remediation of contaminated soil according to claim 2, characterized in that: A circular baffle (10) is provided on both end surfaces of the supporting wheel (9), one side surface of the circular baffle (10) is fixed to the end surface of the supporting wheel (9), and the pulley is located between the two circular baffles (10), and the circular baffle (10) is in sliding contact with the end surface of the pulley. A plurality of first baffles (13) evenly distributed around the circumference are provided on the output shaft (12) of the driving motor (6), and a plurality of second baffles (11) evenly distributed around the circumference are provided on one end of the rotating shaft (8) connected to the driving motor (6), and the positions of the plurality of first baffles (13) and the plurality of second baffles (11) are arranged in a one-to-one correspondence, and a sliding cylinder (17) is sleeved on the outer sides of the first baffles (13) and the second baffles (11), and a plurality of limit blocks (18) are provided on the inner side surface of the sliding cylinder (17), and the limit blocks (18) are fixed on the sliding cylinder (17), and the plurality of first baffles (13) and the plurality of second baffles (11) are located within the installation spacing between adjacent limit blocks (18).

4. The kiln structure for thermal desorption and remediation of contaminated soil according to claim 3, characterized in that: A first baffle (14) is provided on the outer side of one end of the sliding cylinder (17) close to the circular baffle (10), and the middle part of the first baffle (14) is fixed on the rotating shaft (8). A second baffle (19) is provided on one end of the sliding cylinder (17) close to the driving motor (6), and the second baffle (19) is fixed on the sliding cylinder (17). A third baffle (16) is provided on the output shaft (12), and the middle part of the third baffle (16) is fixed on the output shaft (12). A spring (15) is provided between the third baffle (16) and the second baffle (19), and the spring (15) is sleeved on the output shaft (12), and two ends of the spring (15) are respectively tightly arranged on the second baffle (19) and the third baffle (16).

5. The kiln structure for thermal desorption and remediation of contaminated soil according to claim 3, characterized in that: A plurality of rollers are provided on the side surface of the circular baffle (10) that contacts the end surface of the wheel belt (4), and the rollers are rotatably connected to the circular baffle (10).

6. The kiln structure for thermal desorption and remediation of contaminated soil according to claim 3, characterized in that: A columnar cylinder (20) is provided below the sliding cylinder (17), and the columnar cylinder (20) is fixed on the supporting pier (5). A piston (21) is provided inside the columnar cylinder (20), and a first push rod (22) and a second push rod (26) are provided at both ends of the piston (21), and a first wedge block (23) and a second wedge block (27) are provided on the first push rod (22) and the second push rod (26), respectively. The sliding cylinder (17) provided on the two sets of driving components on the same supporting pier (5) are provided with a first push plate (24) and a second push plate (28), respectively, and the first push plate (24) and the second push plate (28) are fixed to the sliding cylinder (17). On the outer surface of the cylindrical tube (20), the first push plate (24) contacts the first wedge block (23) to push the piston (21) toward the second push plate (28), and the second push plate (28) contacts the second wedge block (27) to push the piston (21) toward the first push plate (24). The first air pipe (25) and the second air pipe (29) are respectively provided at both ends of the cylindrical tube (20), one end of each of the first air pipe (25) and the second air pipe (29) are communicated with the interior of the cylindrical tube (20), and the other ends of the first air pipe (25) and the second air pipe (29) are respectively directed to the parts where the wheel belt (4) and the two supporting wheels (9) are about to rotate and contact.

7. The kiln structure for thermal desorption and remediation of contaminated soil according to claim 6, characterized in that: A Y-shaped air pipe is provided at the other end of each of the first air pipe (25) and the second air pipe (29), and two exhaust ends of the Y-shaped air pipe are respectively directed toward the parts of the wheel belt (4) and the supporting wheel (9) that are about to rotate and contact.

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