A device for mixing and conveying contaminated soil and construction waste

Abstract

The present application relates to the technical field of contaminated soil and construction waste treatment, in particular to a contaminated soil and construction waste mixing and conveying device, which comprises a conveying mechanism, a driving unit, a cleaning unit and a scattering part. In the process of conveying the mixture, the mixture is heated and dried by an external heating device, and the inner surface of the screening drum is scraped and cleaned in real time by a scraper, so as to avoid the clogging of the screening drum by the contaminated soil. Meanwhile, the contaminated soil is scattered by the scattering part, the residence time of the contaminated soil in the left area of the variable pitch spiral plate is prolonged, the drying effect of the contaminated soil is improved, and the screening and discharging efficiency and effect of the contaminated soil are improved. The mixture in the conveying process is gathered in the spiral pitch area with small left pitch of the variable pitch spiral plate, and then the mixture in this area is ensured to be fully dried and scattered.

Description

Technical Field

[0001] This invention relates to the field of contaminated soil and construction waste treatment technology, specifically to a device for mixing and conveying contaminated soil and construction waste. Background Technology

[0002] The mixture of contaminated soil and construction waste mainly refers to the mixture of construction waste and contaminated soil generated during demolition, construction or land remediation. The contaminated soil contains heavy metals, petroleum hydrocarbons, polycyclic aromatic hydrocarbons, pesticide residues, etc., while construction waste mainly includes concrete, bricks, mortar, metals, wood and other materials.

[0003] The mixture of contaminated soil and construction waste is transported to a processing plant for recycling after collection. Because the contaminated soil can be used in cement production after recycling, it needs to be screened and recovered during transportation. Currently, the main method for recycling contaminated soil is to use existing screening drums to screen the mixture, thereby separating and collecting the contaminated soil.

[0004] However, due to the high moisture content of the contaminated soil, the following problems may occur during the transportation of the mixture: During screening, the contaminated soil tends to adhere to the screening drum, which not only makes it difficult to feed the material, but also easily causes the screening drum to become clogged, making it difficult for the entire equipment to operate normally or efficiently; at the same time, after being screened, the high moisture content of the contaminated soil makes it easy for it to agglomerate into lumps (or clumps), so that when it is used in the subsequent preparation of cement, the contaminated soil is not easy to mix fully with other materials, thus affecting the quality of the final product. Summary of the Invention

[0005] Therefore, it is necessary to provide a device for mixing and conveying contaminated soil and construction waste, which aims to solve the problems of the aforementioned prior art.

[0006] The present invention provides a device for mixing and conveying contaminated soil and construction waste, including a frame, on which a receiving seat and a screening drum rotatably mounted are installed, and a conveying mechanism for assisting in screening out contaminated soil during the conveying process of the mixture is provided between the receiving seat and the screening drum.

[0007] The receiving seat is equipped with a drive unit for driving the screening drum to rotate and driving the conveying mechanism to transport the mixture.

[0008] The conveying mechanism includes a variable pitch spiral plate fixedly installed inside the screening drum to guide the mixture from left to right and screen out contaminated soil in the mixture. The pitch of the variable pitch spiral plate gradually increases from left to right. A mounting column coaxial with the screening drum is rotatably installed on the receiving seat via a U-shaped frame. A cleaning unit for cleaning the screening drum is installed on the mounting column.

[0009] The cleaning unit includes multiple rotating frames arranged from left to right and fixedly mounted on the mounting column. A rotating plate is slidably arranged on the rotating frame along the radial direction of the screening drum. The rotating plate is located in the spiral spacing of the variable pitch spiral plate, and a scraper is provided on the front side of the rotating plate.

[0010] The cleaning unit also includes a dispersing section mounted on a rotating plate and used to disperse the contaminated soil by oscillation. The dispersing section assists the contaminated soil in being discharged from the screening drum.

[0011] According to an advantageous embodiment, the dispersing part includes swing bars, and a plurality of swing bars are hinged to the rear end face of the rotating plate and arranged equidistantly from left to right, and a dispersing plate is fixedly provided on the lower end face of the swing bars.

[0012] According to an advantageous embodiment, a connecting frame is slidably arranged below the rotating frame along the radial direction of the screening drum. A receiving groove is opened on the upper surface of the rotating plate. The lower end of the connecting frame is slidably arranged in the receiving groove. A return spring is fixedly arranged between the connecting frame and the inner sidewall of the receiving groove.

[0013] According to an advantageous embodiment, the scraper is slidably mounted on the rotating plate via a sliding block, and a pressure spring is fixedly mounted between the sliding block and the rotating plate.

[0014] According to an advantageous embodiment, the drive unit includes a transverse plate, a transverse plate that slides left and right and passes through the rotating plate, a frame-shaped groove corresponding to the swing bar, a mating bar that passes through the rotating plate and into the frame-shaped groove is fixedly provided on the swing bar, and the transverse plate is fixedly connected to the connecting frame.

[0015] According to an advantageous embodiment, a frame-shaped frame is fixedly provided between the front and rear sides of the connecting frame, and a horizontal bar with an axis parallel to the axis of the mounting column is fixedly provided between all the frame-shaped frames. A left-right symmetrical mounting frame is fixedly sleeved on the mounting column. The mounting frame is parallel to the rotating frame and located above the rotating frame. A cleaning top cone is fixedly provided on the lower end face of the rotating plate.

[0016] According to an advantageous embodiment, the drive unit further includes a movable protrusion. A semi-circular movable protrusion is slidably disposed on the upper end face of the mounting frame along the radial direction of the screening drum. A compression spring is fixedly disposed between the movable protrusion and the mounting frame. A fixing ring corresponding to the mounting frame is fixedly disposed on the inner surface of the screening drum. A plurality of circumferentially distributed and semi-circular fixing protrusions are fixedly disposed on the inner ring surface of the fixing ring. The horizontal rod is fixedly connected by a connecting piece movable protrusion.

[0017] According to an advantageous embodiment, the drive unit further includes a drive shaft, on which the drive shaft located outside the screening drum is rotatably mounted on two U-shaped frames. Gears are fixedly sleeved at both ends of the drive shaft. The mounting column and the drive shaft are connected by a belt drive. Two external toothed rings distributed on the left and right are fixedly sleeved on the outer ring surface of the screening drum. The external toothed rings mesh with adjacent gears.

[0018] According to an advantageous embodiment, a mounting rod with an axis extending from left to right is rotatably provided on the front side of the frame. Two brackets distributed on the left and right are fixedly sleeved on the mounting rod. A cleaning brush roller is fixedly provided on both brackets. A spiral spring is fixedly provided between the mounting rod and the frame.

[0019] In summary, the present invention has at least one of the following beneficial effects:

[0020] I. In the process of conveying the mixture, the present invention uses an external heating device to heat and dry the mixture, and uses a scraper to scrape and clean the inner surface of the screening drum in real time to prevent contaminated soil from clogging the screening drum. At the same time, the contaminated soil is dispersed by the dispersing part, which prolongs the time that the contaminated soil stays in the left area of ​​the variable pitch spiral plate, thereby improving the drying effect of the contaminated soil and improving the screening and feeding efficiency and effect of the contaminated soil.

[0021] Second, during the relative movement of the transverse plate, the present invention, in conjunction with the swing bar and the dispersing plate, swings laterally to agitate and disperse the contaminated soil in real time. This improves the drying effect of the contaminated soil and prevents the dried contaminated soil from clogging the screening drum, thus helping to solve the feeding problem and preventing the screened contaminated soil from becoming lumpy and affecting the subsequent mixing effect with other materials.

[0022] Third, the present invention utilizes the characteristic of a small pitch on the left side and a large pitch on the right side of the variable pitch spiral plate to ensure that the mixture during the conveying process gathers in the spiral spacing area with a small pitch on the left side of the variable pitch spiral plate, thereby ensuring that the mixture is fully dried and dispersed in this area. Attached Figure Description

[0023] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort.

[0024] Figure 1 A three-dimensional schematic diagram of the present invention is shown.

[0025] Figure 2 A partial structural schematic diagram of the present invention is shown.

[0026] Figure 3A cross-sectional view of a partial structure of the present invention is shown.

[0027] Figure 4 A schematic diagram of the structure of the receiving seat of the present invention is shown.

[0028] Figure 5 A schematic diagram of the variable pitch spiral plate, drive shaft, and mounting column of the present invention is shown.

[0029] Figure 6 A partial cross-sectional view of the screening roller, mounting column, and fixing protrusion of the present invention is shown.

[0030] Figure 7 The front view of the mounting column, rotating plate, and cleaning top cone of the present invention is shown.

[0031] Figure 8 A schematic diagram of the structure of the screening drum, mounting column and dispersing part of the present invention is shown.

[0032] Figure 9 A schematic diagram of the rotating plate, scraper, and swing bar of the present invention is shown.

[0033] Figure 10 It shows Figure 9 Enlarged view of point A in the middle.

[0034] The above figures include the following reference numerals:

[0035] 1. Frame; 10. Receiving seat; 11. Screening drum; 12. Screening hole; 13. Discharge chute; 2. Conveying mechanism; 20. Variable pitch spiral plate; 21. Mounting column; 22. Cleaning unit; 220. Rotating frame; 221. Rotating plate; 222. Scraper; 223. Connecting frame; 224. Return spring; 225. Pressure spring; 226. Seal; 23. Frame-shaped frame; 230. Horizontal bar; 231. Mounting frame ; 232. Movable protrusion; 233. Compression spring; 234. Fixed protrusion; 235. Cleaning top cone; 24. Dispersing part; 240. Swing bar; 241. Dispersing plate; 25. Mounting rod; 250. Bracket; 251. Cleaning brush roller; 252. Spiral spring; 3. Drive unit; 30. Transverse plate; 300. Frame groove; 301. Mating bar; 31. Drive shaft; 310. External gear ring; 311. Gear. Detailed Implementation

[0036] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, the following description is provided in conjunction with... Figure 1

[0037] The accompanying drawings provide a detailed description of specific embodiments of the present invention. Numerous specific details are set forth in the following description to provide a thorough understanding of the invention. However, the invention can be practiced in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of the invention. Therefore, the invention is not limited to the specific embodiments disclosed below.

[0038] like Figure 1 , Figure 3 and Figure 4 As shown, a mixed conveying device for contaminated soil and construction waste includes a frame 1, on which a receiving seat 10 is welded and installed. A screening drum 11 is rotatably mounted on the receiving seat 10. The screening drum 11 can be set to an inclined or horizontal state according to actual conveying needs. The screening drum 11 has multiple screening holes 12 for screening the mixture. In order to guide the collection of the required contaminated soil, a discharge chute 13 is opened on the receiving seat 10 to guide the contaminated soil to fall out. The discharge chute 13 is an inverted isosceles trapezoidal structure from top to bottom, and the discharge chute 13 is located directly below the screening drum 11. A conveying mechanism 2 is provided between the receiving seat 10 and the screening drum 11 to assist in screening out the contaminated soil in the mixture during the conveying process.

[0039] like Figure 1 As shown, the receiving seat 10 is provided with a drive unit 3 for driving the screening drum 11 to rotate and driving the conveying mechanism 2 to convey the mixture.

[0040] like Figure 1 , Figure 2 , Figure 3 and Figure 5 As shown, the conveying mechanism 2 includes a variable pitch spiral plate 20. The variable pitch spiral plate 20 is fixedly installed inside the screening drum 11 to guide the mixture to move from left to right and to screen out the contaminated soil in the mixture. The pitch of the variable pitch spiral plate 20 gradually increases from left to right. Due to the characteristic that the left side of the variable pitch spiral plate 20 has a small pitch and the right side has a large pitch, the mixture gathers in the spiral spacing area with a small pitch on the left side of the variable pitch spiral plate 20 during the conveying process. That is, the small pitch section of the variable pitch spiral plate 20 has the function of guiding the mixture to gather, which facilitates the subsequent screening of contaminated soil and enhances the conveying thrust of the mixture. The receiving seat 10 is rotatably equipped with two U-shaped frames that are symmetrical on the left and right sides, and the mounting column 21 is coaxial with the screening drum 11. The mounting column 21 is equipped with a cleaning unit 22 for cleaning the screening drum 11.

[0041] like Figure 1 , Figure 5 , Figure 6 and Figure 8As shown, the cleaning unit 22 includes a rotating frame 220. Multiple rotating frames 220 arranged from left to right are fixedly sleeved on the mounting column 21. Rotating plates 221 are slidably arranged on the rotating frame 220 along the radial direction of the screening drum 11. In order to avoid the rotating plates 221 getting stuck with the variable pitch spiral plate 20 during the rotation of the mounting column 21, all rotating plates 221 are located inside the variable pitch spiral plate 20. A scraper 222 is provided on the front side of the rotating plate 221. During the process of the driving unit 3 causing the rotating plate 221 to rotate and move radially back and forth, the rotating plate 221 drives the scraper 222 to clean the screening drum 11.

[0042] like Figure 1 and Figure 8 As shown, the cleaning unit 22 also includes a dispersing section 24 mounted on the rotating plate 221, which disperses the contaminated soil by oscillation. The dispersing section 24 assists in the discharge of the contaminated soil from the screening drum 11. Further, the left section of the variable-pitch spiral plate 20 is equipped with an external heating device (not shown in the figure) to heat and dry the mixture within that section of the variable-pitch spiral plate 20, accelerating the evaporation of moisture.

[0043] like Figure 2 , Figure 3 , Figure 5 , Figure 6 , Figure 7 and Figure 8 During operation, the drive unit 3 operates, causing the screening drum 11 to drive the variable pitch spiral plate 20 to rotate synchronously in the forward direction. The variable pitch spiral plate 20 drives the mixture entering the screening drum 11 to move from left to right. The external heating equipment operates to heat and dry the mixture. During the rotation of the screening drum 11, the screening holes 12 on it screen the mixture, and the contaminated soil in the mixture falls out through the screening holes 12. At the same time, the drive unit 3 causes the mounting column 21 to drive the rotating plate 221 and scraper 222 to rotate in opposite directions. During the rotation, the scraper 222 scrapes and cleans the inner surface of the screening drum 11 to prevent contaminated soil from clogging the screening drum 11. Secondly, during the rotation, the mounting column 21 disperses the contaminated soil through the dispersing part 24, which helps the contaminated soil to be heated evenly, improves the heating and drying efficiency and effect, and assists the contaminated soil to be screened out from the screening drum 11. The scraper 222 and the dispersing section 24 agitate the mixture, prolonging the time that contaminated soil stays in the left side area of ​​the variable pitch spiral plate 20 (the area with drying effect), thereby improving the drying effect on the contaminated soil and reducing the probability of adhesion and clogging problems caused by the high moisture content of the contaminated soil.

[0044] The contaminated soil that is finally screened out falls into the discharge trough 13, and is guided to accumulate by the inclined inner wall of the discharge trough 13, so that the contaminated soil can be collected in a concentrated manner at the lower opening of the discharge trough 13.

[0045] It should be added that, such as Figure 7 and Figure 9 As shown, the scraper 222 is slidably mounted on the rotating plate 221 via a sliding block. A pressure spring 225 is fixedly mounted between the sliding block and the rotating plate 221. The scraper 222 is a right-angled triangle with its inclined surface facing upwards.

[0046] Initially, the pressure spring 225 is in a compressed state. During the full rotation of the rotating plate 221, the rotating plate 221 also reciprocates radially along the screening drum 11. When the rotating plate 221 moves radially away from the inner surface of the screening drum 11, the compression deformation of the pressure spring 225 decreases, but it is still in a compressed state. The elastic force generated by the deformation of the pressure spring 225 causes the sliding block to drive the scraper 222 to contact the inner surface of the screening drum 11. When the rotating plate 221 moves radially closer to the inner surface of the screening drum 11, the compression of the pressure spring 225 intensifies. In summary, the elastic force generated by the deformation of the pressure spring 225 ensures that the scraper 222 always contacts the inner surface of the screening drum 11, and the scraper 222 continuously scrapes and cleans the screening holes 12.

[0047] like Figure 1 , Figure 2 and Figure 5 As shown, the drive unit 3 includes a drive shaft 31. The two U-shaped frames are rotatably mounted on the drive shaft 31 located outside the screening drum 11. The drive shaft 31 is connected to an external motor (not shown in the figure). Gears 311 are fixedly sleeved at both ends of the drive shaft 31. The mounting column 21 is connected to the drive shaft 31 by a belt drive. Two external toothed rings 310 are fixedly sleeved on the outer ring surface of the screening drum 11, and the external toothed rings 310 mesh with the adjacent gears 311.

[0048] During operation, the external motor first drives the gear 311 on the drive shaft 31 to rotate synchronously. The meshing between the gear 311 and the corresponding external gear ring 310 causes the screening drum 11 to rotate synchronously in the forward direction. Meanwhile, the drive shaft 31 drives the mounting column 21 to rotate synchronously via belt transmission. The rotation directions of the screening drum 11 and the mounting column 21 are opposite. It should be noted that the use of a gear 311 with a large size difference to drive the external gear ring 310 is to amplify the torque, making the screening drum 11 easier to rotate.

[0049] like Figure 8 and Figure 9 As shown, the dispersing part 24 includes swing bars 240. Multiple swing bars 240 are hinged to the rear end face of the rotating plate 221 and are arranged at equal intervals from left to right. A dispersing piece 241 in the shape of an inverted triangle is fixedly provided on the lower end face of the swing bars 240.

[0050] like Figure 1 , Figure 8 , Figure 9 and Figure 10 As shown, the drive unit 3 also includes a transverse plate 30. The transverse plate 30 slides left and right on the rotating plate 221 and passes through it. The transverse plate 30 has frame-shaped grooves 300 that correspond one-to-one with the swing bars 240. The swing bars 240 have mating bars 301 that pass through the rotating plate 221 and into the frame-shaped grooves 300. The transverse plate 30 is fixedly connected to the connecting frame 223. The distance between the left and right side walls of the mating bar 301 is smaller than the distance between the left and right inner side walls of the frame-shaped groove 300. It should be noted that, in order to facilitate the installation of components such as the transverse plate 30, the connecting frame 223, and the pressure spring 225 located in the rotating plate 221, the rotating plate 221 is set as an assembly structure and fixed by welding.

[0051] like Figure 7 , Figure 8 , Figure 9 and Figure 10 As shown, a connecting frame 223 is slidably arranged radially below the rotating frame 220 along the screening drum 11. A receiving groove is opened on the upper end face of the rotating plate 221. The lower end of the connecting frame 223 is slidably arranged in the receiving groove. A return spring 224 is fixedly arranged between the connecting frame 223 and the inner side wall of the receiving groove. In order to prevent the mixture from entering the receiving groove during the conveying process and to protect the return spring 224, a sealing element 226 for sealing the receiving groove and located above the return spring 224 is fixedly arranged between the inner wall of the receiving groove and the connecting frame 223.

[0052] During the rotation of the rotating plate 221 and the swing bar 240, the rotating plate 221 will contact the plate surface of the corresponding spiral area on the variable pitch spiral plate 20. During the continuous full rotation of the variable pitch spiral plate 20, the left and right sides of the rotating plate 221 will contact the variable pitch spiral plate 20. The variable pitch spiral plate 20 will push the rotating plate 221, causing the rotating plate 221 to move laterally along the axial direction of the mounting column 21. During this period, the return spring 224 will undergo adaptive deformation simultaneously. The adaptive deformation of the return spring 224 will prevent the rotating plate 221 and the variable pitch spiral plate 20 from getting stuck.

[0053] In the above process, the rotating plate 221 moves laterally relative to the rotating frame 220. Through the relative movement between the rotating plate 221 and the rotating frame 220, the transverse plate 30 moves relative to the rotating plate 221. The mating strip 301 and the swing strip 240 are set on the rotating plate 221. Therefore, during the relative movement of the transverse plate 30, the inner wall of the left or right side of the frame groove 300 will push the corresponding mating strip 301. Through the mating between the frame groove 300 and the corresponding mating strip 301, the mating strip 301 drives the swing strip 240 and the dispersing plate 241 to swing laterally. The swinging strip 240 and the dispersing plate 241 are used to stir and disperse the contaminated soil, which improves the drying effect of the contaminated soil and facilitates the screening and discharge of the contaminated soil.

[0054] like Figure 6 , Figure 7 and Figure 8 As shown, a frame-shaped frame 23 is fixedly installed between the front and rear sides of the connecting frame 223. The rotating frame 220 corresponds to the inside of the frame-shaped frame 23. A horizontal rod 230 with an axis parallel to the axis of the mounting column 21 is fixedly installed between all the frame-shaped frames 23. A left-right symmetrical mounting frame 231 is fixedly sleeved on the mounting column 21. The mounting frame 231 is parallel to the rotating frame 220 and located above the rotating frame 220. A cleaning cone 235 is fixedly installed on the lower end face of the rotating plate 221. In order for the cleaning cone 235 to be able to push into the screening hole 12, the cleaning cone 235 is made of rubber and its hole diameter is smaller than the hole diameter of the screening hole 12.

[0055] like Figure 1 , Figure 6 , Figure 7 and Figure 8 As shown, the drive unit 3 also includes a movable protrusion 232. The upper end face of the mounting frame 231 is slidably provided with a semi-circular movable protrusion 232 along the radial direction of the screening drum 11. A compression spring 233 is fixedly provided between the movable protrusion 232 and the mounting frame 231. A fixed ring corresponding to the mounting frame 231 is fixedly provided on the inner surface of the screening drum 11. The variable pitch spiral plate 20 is located between the fixed rings. A plurality of circumferentially distributed and semi-circular fixed protrusions 234 are fixedly provided on the inner ring surface of the fixed rings. The horizontal rod 230 is fixedly connected to the movable protrusion 232 through a connector.

[0056] During the full rotation of the mounting column 21, the mounting column 21 drives the mounting bracket 231 and the movable protrusion 232 to rotate synchronously. The compression spring 233 is always in a compressed state. The elastic force generated by its compression keeps the movable protrusion 232 in close contact with the inner ring surface of the fixed ring or the surface of the fixed protrusion 234. When the movable protrusion 232 gradually comes into contact with the fixed protrusion 234, the fixed protrusion 234 squeezes the movable protrusion 232, causing the movable protrusion 232 to drive the horizontal bar 230 closer to the mounting column 21. The compression spring 233 is further compressed, and the frame 23... The rotating plate 221 moves synchronously with the horizontal bar 230. When the movable protrusion 232 and the fixed protrusion 234 abut against each other and are both located on the same radial line of the fixed ring, the rotating plate 221 moves to its maximum displacement position. The rotating plate 221 is in close contact with the inner surface of the screening drum 11. As the mounting frame 231 gradually rotates, the movable protrusion 232 disengages from the fixed protrusion 234, and the elastic force generated by the deformation of the compression spring 233 causes the movable protrusion 232 to contact the inner ring wall of the fixed ring. During this process, the rotating plate 221 moves closer to the mounting column 21 (away from the screening drum 11). In summary, during the full rotation of the mounting frame 231 and the rotating plate 221, the rotating plate 221 also reciprocates along the length of the rotating frame 220.

[0057] During the reciprocating movement of the rotating plate 221 along the length of the rotating frame 220, the rotating plate 221 drives the cleaning cone 235 on it to move synchronously. The cleaning cone 235 reciprocates into the screening hole 12 to clean the screening hole 12 again, so as to avoid the problem of contaminated soil getting stuck in the screening hole 12 and affecting the overall conveying and screening efficiency and effect.

[0058] It should be noted that the total number of frame-shaped brackets 23 in this invention can be adjusted according to actual needs. Figure 5 and Figure 6 The number of frame frames 23 shown does not mean that only these few frame frames 23 can be set in this invention. However, several frame frames 23 must be set in the left half of the screening drum 11, that is, in the spiral spacing area with a small pitch on the left side of the variable pitch spiral plate 20, in order to ensure that the contaminated soil in this area is dispersed to improve the drying efficiency and effect, and to avoid the contaminated soil in this area from clogging the screening drum 11.

[0059] like Figure 1 , Figure 2 and Figure 3 As shown, a mounting rod 25 with its axis extending from left to right is rotatably mounted on the front side of the frame 1. Two brackets 250 distributed on the left and right are fixedly sleeved on the mounting rod 25. A cleaning brush roller 251 is fixedly mounted on both brackets 250. A spiral spring 252 is fixedly mounted between the mounting rod 25 and the frame 1.

[0060] The spiral spring 252 is always in a deformed state. The elastic force generated by the deformation of the spiral spring 252 makes the support 250 always tend to approach the outer surface of the screening drum 11, so that the cleaning brush roller 251 is always in close contact with the screening drum 11. During the full rotation of the screening drum 11, the cleaning brush roller 251 brushes and cleans the outer surface of the screening drum 11, enhancing the anti-clogging effect.

[0061] In the description of this invention, it should be understood that the orientation or positional relationship indicated by directional terms such as "front, back, up, down, left, right", "horizontal, vertical, horizontal" and "top, bottom" is generally based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing this invention and simplifying the description. Unless otherwise stated, these directional terms do not indicate or imply that the device or element referred to must have a specific orientation or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on the scope of protection of this invention; the directional terms "inner" and "outer" refer to the inner and outer contours relative to the outline of each component itself.

[0062] Furthermore, the terms "first," "second," "number one," and "number two" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first," "second," "number one," or "number two" may explicitly or implicitly include at least one of that feature. In the description of this invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0063] In the description of this invention, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "connected," "installed," and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal communication between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0064] The embodiments described herein are preferred embodiments of the present invention and are not intended to limit the scope of protection of the present invention. Therefore, all equivalent changes made in accordance with the structure, shape and principle of the present invention should be covered within the scope of protection of the present invention.

Claims

1. A device for mixing and conveying contaminated soil and construction waste, comprising a frame, wherein a receiving seat and a screening drum rotatably mounted on the frame are installed, characterized in that: A conveying mechanism is provided between the receiving seat and the screening drum to assist in screening out contaminated soil during the mixture conveying process; The receiving seat is equipped with a drive unit for driving the screening drum to rotate and driving the conveying mechanism to convey the mixture; The conveying mechanism includes a variable pitch spiral plate fixedly installed inside the screening drum to guide the mixture from left to right and screen out the contaminated soil in the mixture. A mounting column coaxial with the screening drum is rotatably installed on the receiving seat via a U-shaped frame. A cleaning unit for cleaning the screening drum is installed on the mounting column. The cleaning unit includes multiple rotating frames arranged from left to right and fixedly mounted on the mounting column. A rotating plate is slidably mounted on the rotating frame along the radial direction of the screening drum, and a scraper is provided on the front side of the rotating plate. During the period when the rotating plate rotates and moves radially back and forth, the rotating plate drives the scraper to move and clean the inner surface of the screening drum. The cleaning unit also includes a dispersing section disposed on a rotating plate and which disperses the contaminated soil by oscillation, the dispersing section assisting the contaminated soil to be discharged from the screening drum; The dispersing section includes swing bars. Multiple swing bars are hinged to the rear end face of the rotating plate and arranged at equal intervals from left to right. Dispersing plates are fixedly provided on the lower end face of the swing bars. A connecting frame is slidably arranged below the rotating frame along the radial direction of the screening drum. A receiving groove is opened on the upper surface of the rotating plate. The lower end of the connecting frame is slidably arranged in the receiving groove. A return spring is fixedly arranged between the connecting frame and the inner side wall of the receiving groove. The drive unit includes a transverse plate, a rotating plate that slides left and right and is provided through the transverse plate, a frame-shaped groove that corresponds one-to-one with the swing bar, a mating bar that passes through the rotating plate and into the frame-shaped groove is fixedly provided on the swing bar, and the transverse plate is fixedly connected to the connecting frame.

2. The device for mixing and conveying contaminated soil and construction waste according to claim 1, characterized in that: The pitch of the variable pitch spiral plate gradually increases from left to right, and the rotating plate is located in the spiral spacing of the variable pitch spiral plate.

3. The device for mixing and conveying contaminated soil and construction waste according to claim 1, characterized in that: The scraper is slidably mounted on the rotating plate via a sliding block, and a pressure spring is fixedly mounted between the sliding block and the rotating plate.

4. The device for mixing and conveying contaminated soil and construction waste according to claim 1, characterized in that: A frame-shaped frame is fixedly installed between the front and rear sides of the connecting frame. A horizontal bar with an axis parallel to the axis of the mounting column is fixedly installed between all the frame-shaped frames. A symmetrical mounting frame is fixedly fitted on the mounting column. The mounting frame is parallel to the rotating frame and located above the rotating frame. A cleaning cone is fixedly installed on the lower end face of the rotating plate.

5. The device for mixing and conveying contaminated soil and construction waste according to claim 4, characterized in that: The drive unit also includes movable protrusions. The upper end face of the mounting frame is slidably provided with a semi-circular movable protrusion along the radial direction of the screening drum. A compression spring is fixedly provided between the movable protrusion and the mounting frame. A fixed ring corresponding to the mounting frame is fixedly provided on the inner surface of the screening drum. Multiple circumferentially distributed and semi-circular fixed protrusions are fixedly provided on the inner ring surface of the fixed ring. The horizontal rod is fixedly connected through the movable protrusion of the connector.

6. The device for mixing and conveying contaminated soil and construction waste according to claim 1, characterized in that: The drive unit also includes a drive shaft. The drive shaft, located outside the screening drum, is rotatably mounted on two U-shaped frames. Gears are fixedly sleeved at both ends of the drive shaft. The mounting column and the drive shaft are connected by a belt drive. Two external toothed rings, distributed on the left and right, are fixedly sleeved on the outer ring surface of the screening drum. The external toothed rings mesh with adjacent gears.

7. The device for mixing and conveying contaminated soil and construction waste according to claim 1, characterized in that: The front side of the frame is rotatably equipped with a mounting rod whose axis extends from left to right. Two brackets distributed on the left and right are fixedly sleeved on the mounting rod. A cleaning brush roller is fixedly mounted on both brackets. A spiral spring is fixedly mounted between the mounting rod and the frame.

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