Asphalt concrete aggregate grading screening device

Abstract

The invention discloses an asphalt concrete aggregate grading and screening device, and relates to the field of asphalt concrete production. The asphalt concrete aggregate grading screening device comprises a bottom plate, a supporting frame fixedly connected to the upper surface of the bottom plate, a driving mechanism arranged in the middle of the upper surface of the bottom plate, a first screening plate, a second screening plate, a third screening plate and a material receiving plate, and the first screening plate, the second screening plate, the third screening plate and the material receiving plate are fixedly connected to the surface of the supporting frame. The end, away from the bottom plate, of the surface of the mounting plate is fixedly connected with a treatment box. According to the asphalt concrete aggregate screening device, first stirring and crushing treatment can be conducted on dried asphalt concrete aggregate entering the treatment box from the feeding opening, then second crushing treatment is conducted on the asphalt concrete aggregate on the surface of the first screening plate through a pressing plate and a pressing roller, and it is guaranteed that the screening quality of the asphalt concrete aggregate can be guaranteed in the screening process; and the influence on the accurate evaluation of the aggregate grading is avoided.

Description

Technical Field

[0001] The invention relates to the field of asphalt concrete production, and in particular to an asphalt concrete aggregate grading and screening device. Background Art

[0002] The asphalt concrete aggregate grading and screening device is used to perform particle size classification and gradation analysis on asphalt concrete aggregates. It uses a motor to drive the eccentric block to generate high-frequency vibration. The asphalt concrete aggregates bounce forward on the inclined screen and are separated step by step according to the size of the screen holes. Raw materials such as gravel and sand are graded according to particle size (such as 0-3mm, 3-5mm, 5-10mm, 10-15mm) to ensure that they meet the asphalt mixture gradation curve. Before screening, asphalt concrete aggregate is generally dried. This is because if the aggregate contains moisture, fine particles (such as sand, stone powder, etc.) are easy to stick to each other due to the adsorption of the surface water film, forming "particle clumps". These clumps may not be able to pass through the sieve of the corresponding aperture during the screening process, resulting in particles smaller than the sieve size being misjudged as large particles, causing deviations in the screening results, thereby affecting the accurate assessment of the aggregate gradation. However, the asphalt concrete aggregate after drying will still have agglomeration. This is because if the aggregate contains more clay particles or stone powder (especially the part with a particle size less than 0.075mm), even after drying, the fine powder particles may still be adsorbed to each other due to intermolecular forces (such as van der Waals forces) or electrostatic effects. The existing screening device does not have a mechanism for crushing the asphalt concrete aggregate clumps, which will still lead to deviations in the screening results, thereby affecting the accurate assessment of the aggregate gradation.

[0003] Therefore, it is necessary to propose an asphalt concrete aggregate grading screening device to solve the above problems. Summary of the Invention

[0004] The main purpose of the present invention is to provide an asphalt concrete aggregate grading and screening device, which can effectively solve the problems in the background technology.

[0005] To achieve the above object, the technical solution adopted by the present invention is: An asphalt concrete aggregate grading screening device comprises a base plate, a support frame fixedly connected to the upper surface of the base plate, a driving mechanism arranged in the middle of the upper surface of the base plate, and a first sieve plate, a second sieve plate, a third sieve plate and a receiving plate fixedly connected to the surface of the support frame, a mounting plate fixedly connected to the left side of the upper surface of the base plate, a receiving and processing box fixedly connected to the end of the mounting plate surface away from the base plate, a feed port provided on the surface of the processing box, a discharge port provided at the bottom of the processing box, and a stirring column rotatably connected to the top of the processing box for stirring agglomerated asphalt concrete aggregate; The sides of the first sieve plate, the second sieve plate and the third sieve plate are symmetrically and slidably connected to a movable block, the surface of the movable block is provided with a circular hole, the wall of the circular hole is fixedly connected to a cylinder, wherein a movable frame is fixedly connected between the two cylinders, and a rotating block is cooperatively installed on the inner wall of the movable frame, the rotating block is fixedly connected to the side of the stirring column surface close to the first sieve plate, the sides of the first sieve plate, the second sieve plate and the third sieve plate are located on the right side of the movable block and are rotatably connected to the pressure roller and the rotating column, the surface of the rotating column is fixedly connected to the first fixed rod evenly distributed in an annular shape, the surfaces of the first sieve plate, the second sieve plate and the third sieve plate are provided with vertical holes between the movable block and the pressure roller, and the two vertical hole walls are slidably connected to the pressure plate; An L-shaped column is fixedly connected to the end surface of the stirring column close to the first sieve plate, and a plurality of second fixing rods are fixedly connected below the L-shaped column.

[0006] Preferably, the surface of the support frame is symmetrically fixedly connected to a first spring at one end close to the mounting plate, the other end of the first spring is fixedly connected to an adjusting plate, the three cylinders are fixedly connected to the adjusting plate, the surface of the adjusting plate away from the first spring is equidistantly fixedly connected to a rack column, the top of the rack column is meshed with a transmission gear, there are twelve transmission gears, both ends of the pressure roller are fixedly connected to the transmission gear, both ends of the rotating column are rotatably connected to the transmission gear through a one-way bearing, the surface of the rack column is located on the left side of the transmission gear and is fixedly connected to a limiting ring, and the two limiting rings are slidably connected to the pressure plate.

[0007] Preferably, the initial state of the first spring is a compressed state.

[0008] Preferably, a rectangular groove is provided on the upper end surface of the stirring column, a transmission column is slidably connected to the wall of the rectangular groove, and a first motor is cooperatively mounted on the upper end of the transmission column.

[0009] Preferably, the surface of the stirring column is fixedly connected to a cross column at one end close to the first motor, a second spring is sleeved on the outer side of the cross column, one end of the second spring is fixedly connected to the stirring column, the other end of the second spring is fixedly connected to a movable sleeve, the movable sleeve is slidably connected to the cross column, the end of the movable sleeve close to the stirring column is fixedly connected to the connecting column, the end of the connecting column surface away from the movable sleeve is fixedly connected to a convex column, the top upper surface of the processing box is fixedly connected to a limiting strip, the convex column and the limiting strip are installed in coordination, the top of the processing box is fixedly connected to an arc plate near the edge, the surface of the arc plate away from the processing box is fixedly connected to an L-shaped frame plate, and the L-shaped frame plate is fixedly connected to the first motor.

[0010] Preferably, the side surfaces of the first sieve plate, the second sieve plate and the third sieve plate are located below the processing box and are symmetrically fixedly connected with limiting columns, there are six limiting columns, and the limiting columns are slidably connected to the movable block.

[0011] Preferably, the surface of the stirring column is located above the rotating block and is rotatably connected to a mounting ring, the mounting ring is slidably connected to the bottom of the processing box, the surface of the mounting ring is fixedly connected to a first rack evenly distributed in a ring shape, the surface of the first rack is meshed with a first gear, the surface of the first gear is rotatably connected to a mounting seat, multiple mounting seats are fixedly connected to the bottom of the processing box, and the surface of the discharge port is cooperated with a cover plate evenly distributed in a ring shape, and the cover plate is fixedly connected to the first gear.

[0012] Preferably, a circular ring is fixedly connected to the surface of the transmission column below the first motor, a third spring is fixedly connected below the circular ring, and the lower end of the third spring is fixedly connected to the stirring column.

[0013] Compared with the prior art, the present invention provides an asphalt concrete aggregate grading and screening device, which has the following beneficial effects: The asphalt concrete aggregate grading and screening device, through the provided processing box and stirring column, can perform a first stirring and crushing treatment on the dried asphalt concrete aggregate entering the processing box from the feed inlet, and then the pressing plate and the pressing roller perform a second crushing treatment on the asphalt concrete aggregate on the surface of the first screen plate, thereby ensuring the screening quality of the asphalt concrete aggregate during the screening process and avoiding affecting the accurate assessment of the aggregate gradation.

[0014] The asphalt concrete aggregate grading screening device has a convex column and a limit bar. In the process of the first motor driving the transmission column to rotate, the stirring column rotates with the rotation of the transmission column, the cross column rotates with the rotation of the stirring column, the convex column moves in the direction away from the stirring column, and the second spring is stretched until the convex column moves to the outside of the limit bar. The movable sleeve can contact the arc plate during the rotation process, thereby driving the stirring column to move upward for a distance. The first rack and the first gear cooperate to drive the cover plate to rotate, thereby realizing automatic unloading of the asphalt concrete aggregate after mixing and crushing. When the asphalt concrete aggregate slides to the surface of the first screen plate, since the L-shaped column rotates with the rotation of the stirring column, multiple second fixed rods can spread the asphalt concrete aggregate to avoid the asphalt concrete aggregate from being concentrated and stacked during the screening process, thereby further ensuring the screening effect.

[0015] The asphalt concrete aggregate grading screening device is composed of a rack column and a transmission gear, which can drive the rotating column to rotate. Multiple first fixed rods rotate as the rotating column rotates. The rotation of the first fixed rods can adjust the position of the asphalt concrete aggregate placed on the surface of the first sieve plate, the second sieve plate and the third sieve plate, so that the asphalt concrete aggregate can be screened for a longer time and the screening effect is guaranteed. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of the overall structure of the present invention; Figure 2 The present invention Figure 1 A1 in the middle is an enlarged view; Figure 3 The present invention Figure 1 A2 in the middle is an enlarged view; Figure 4 This is a schematic structural diagram of the present invention from another angle; Figure 5 The present invention Figure 4 Enlarged view of point B in the middle; Figure 6 It is a schematic diagram of the partial internal structure of the processing box of the present invention; Figure 7 The present invention Figure 6 Enlarged view of point C in the middle.

[0017] In the figure: 1, bottom plate; 10, pressure roller; 11, support frame; 12, driving mechanism; 13, first screen plate; 14, second screen plate; 15, third screen plate; 16, receiving plate; 17, rotating column; 171, first fixing rod; 18, vertical hole; 19, pressure plate; 110, L-shaped column; 111, second fixing rod; 112, first spring; 113, adjusting plate; 114, rack column; 115, transmission gear; 116, limiting ring; 2, mounting plate; 3, processing box; 4, inlet Feed inlet; 5. Discharge outlet; 6. Stirring column; 61. Rectangular groove; 62. Transmission column; 621. Circular ring; 63. First motor; 64. Horizontal column; 65. Second spring; 66. Movable sleeve; 67. Connecting column; 68. Boss; 69. Limiting bar; 610. Arc plate; 611. Mounting ring; 612. First rack; 613. First gear; 614. Mounting seat; 615. Cover plate; 7. Movable block; 71. Circular hole; 72. Cylinder; 8. Movable frame; 9. Rotating block. DETAILED DESCRIPTION

[0018] In order to make the technical means, creative features, objectives and effects achieved by the present invention easier to understand, the present invention is further described below in conjunction with specific implementation methods.

[0019] See also Figures 1 to 7, an asphalt concrete aggregate grading screening device, comprising a base plate 1, a support frame 11 fixedly connected to the upper surface of the base plate 1, a driving mechanism 12 arranged in the middle of the upper surface of the base plate 1, and a first sieve plate 13, a second sieve plate 14, a third sieve plate 15 and a material receiving plate 16 fixedly connected to the surface of the support frame 11, a mounting plate 2 is fixedly connected to the left side of the upper surface of the base plate 1, and a receiving treatment box 3 is fixedly connected to the end of the mounting plate 2 away from the base plate 1, a feed port 4 is provided on the surface of the treatment box 3, a discharge port 5 is provided at the bottom of the treatment box 3, and a stirring column 6 for stirring the agglomerated asphalt concrete aggregate is rotatably connected to the top of the treatment box 3; The sides of the first sieve plate 13, the second sieve plate 14 and the third sieve plate 15 are symmetrically and slidably connected with the movable block 7, the surface of the movable block 7 is provided with a circular hole 71, and the hole wall of the circular hole 71 is fixedly connected with a cylinder 72, wherein a movable frame 8 is fixedly connected between the two cylinders 72, and a rotating block 9 is installed on the inner wall of the movable frame 8. The rotating block 9 is fixedly connected to the side of the surface of the stirring column 6 close to the first sieve plate 13, and the sides of the first sieve plate 13, the second sieve plate 14 and the third sieve plate 15 are located on the right side of the movable block 7 and are rotatably connected with the pressure roller 10 and the rotating column 17. The surface of the rotating column 17 is fixedly connected with a first fixed rod 171 evenly distributed in an annular shape, and the surfaces of the first sieve plate 13, the second sieve plate 14 and the third sieve plate 15 are provided with vertical holes 18 between the movable block 7 and the pressure roller 10, and the hole walls of the two vertical holes 18 are slidably connected with a pressure plate 19; An L-shaped column 110 is fixedly connected to the end surface of the stirring column 6 close to the first sieve plate 13, and a plurality of second fixing rods 111 are fixedly connected to the lower side of the L-shaped column 110; It should be noted that, the asphalt concrete aggregate is fed from the feed port 4, the first motor 63 is started, driving the transmission column 62 to rotate, and the stirring column 6 rotates as the transmission column 62 rotates, thereby stirring and crushing the asphalt concrete aggregate placed in the processing box 3, and when the protruding column 68 moves to the outside of the limiting bar 69, the movable sleeve 66 can contact with the arc plate 610 and generate relative rotation, driving the stirring column 6 to move upward, and the first gear 613 cooperates with the first rack 612 to drive the cover plate 615 to rotate, and the asphalt concrete aggregate in the processing box 3 is discharged, and the first sieve plate 13, the second sieve plate 14 and the third sieve plate 15 are used to sieve the asphalt concrete aggregate. The green concrete aggregate is screened, and the asphalt concrete aggregate that has undergone the first crushing treatment and is placed on the surface of the first sieve plate 13, the second sieve plate 14 and the third sieve plate 15 is further crushed by the pressing plate 19 and the pressing roller 10. The asphalt concrete aggregate that has undergone the crushing treatment by the pressing roller 10 is loosened by multiple first fixed rods 171 on the surface of the rotating column 17. At the same time, the position of the asphalt concrete aggregate can be adjusted, the screening time can be extended, and the screening effect can be further ensured. The asphalt concrete aggregate that has undergone the screening treatment is discharged from the first sieve plate 13, the second sieve plate 14, the third sieve plate 15 and the receiving plate 16 at one end away from the mounting plate 2.

[0020] The first spring 112 is symmetrically fixedly connected to one end of the support frame 11 near the mounting plate 2, and the other end of the first spring 112 is fixedly connected to the adjustment plate 113. The three cylinders 72 are fixedly connected to the adjustment plate 113, and the surface of the adjustment plate 113 away from the first spring 112 is equidistantly fixedly connected to a rack column 114. A transmission gear 115 is meshed and connected above the rack column 114. There are twelve transmission gears 115. Both ends of the pressure roller 10 are fixedly connected to the transmission gear 115. Both ends of the rotating column 17 are rotatably connected to the transmission gear 115 through a one-way bearing. The surface of the rack column 114 is located on the left side of the transmission gear 115 and is fixedly connected to a limiting ring 116. The two limiting rings 116 are both slidably connected to the pressure plate 19; the initial state of the first spring 112 is a compressed state; It should be noted that, since both ends of the rotating column 17 are rotatably connected to the transmission gear 115 via a one-way bearing, when the movable frame 8 moves away from the mounting plate 2, the rack column 114 moves to drive the transmission gear 115 to rotate, which can drive the rotating column 17 to rotate, but not vice versa. It should be noted that the reaction force generated by the compression of the first spring 112 acts on the surface of the adjustment plate 113, so that during the rotation of the rotating block 9, the inner side of the movable frame 8 can be in close contact with the surface of the rotating block 9. The rotation of the rotating block 9 can drive the movable block 7, the adjustment plate 113 and the rack column 114 to move back and forth. The limiting ring 116 moves together with the rack column 114, which can drive the pressure plate 19 to move toward the direction close to the bottom plate 1 or away from the place, and the asphalt concrete aggregate spread out on the surface of the first sieve plate 13, the second sieve plate 14 and the third sieve plate 15 is crushed for the second time, and the asphalt concrete aggregate crushed by the pressure roller 19 is crushed for the third time by the pressure roller 10 to ensure the screening effect. The asphalt concrete aggregate crushed by the pressure roller 10 is loosened by multiple first fixed rods 171 on the surface of the rotating column 17, and the position of the asphalt concrete aggregate can be adjusted at the same time, the screening time is extended, and the screening effect is further ensured.

[0021] A rectangular groove 61 is formed on the upper end surface of the stirring column 6. A transmission column 62 is slidably connected to the wall of the rectangular groove 61. A first motor 63 is mounted on the upper end of the transmission column 62. One end of the surface of the stirring column 6 close to the first motor 63 is fixedly connected to a cross column 64, and a second spring 65 is sleeved on the outer side of the cross column 64. One end of the second spring 65 is fixedly connected to the stirring column 6, and the other end of the second spring 65 is fixedly connected to a movable sleeve 66. The movable sleeve 66 is slidably connected to the cross column 64. The end of the movable sleeve 66 close to the stirring column 6 is fixedly connected to a connecting column 67, and the end of the surface of the connecting column 67 away from the movable sleeve 66 is fixedly connected to a protruding column 68. The upper surface of the top of the processing box 3 is fixedly connected to a limiting strip 69, and the protruding column 68 is installed in coordination with the limiting strip 69. The top of the processing box 3 is fixedly connected to an arc plate 610 near the edge, and the surface of the arc plate 610 away from the processing box 3 is fixedly connected to an L-shaped frame plate, which is fixedly connected to the first motor 63; It should be noted that the first motor 63 drives the transmission column 62 to rotate, and then drives the stirring column 6 to rotate, stirring and crushing the asphalt concrete aggregate entering from the feed port 4, and the cross column 64 rotates as the stirring column 6 rotates, and the protruding column 68 moves in the direction away from the stirring column 6. The second spring 65 is stretched until the protruding column 68 moves to the outside of the limit bar 69. The movable sleeve 66 can contact the arc plate 610 during the rotation process, and then drive the stirring column 6 to move upward for a distance. The first rack 612 cooperates with the first gear 613 to drive the cover plate 615 to rotate, thereby realizing automatic unloading of the asphalt concrete aggregate after stirring and crushing. When the asphalt concrete aggregate slides to the surface of the first screen plate 13, since the L-shaped column 110 rotates as the stirring column 6 rotates, the multiple second fixed rods 111 can spread the asphalt concrete aggregate to avoid the asphalt concrete aggregate from being concentrated and stacked during the screening process, thereby ensuring the screening effect.

[0022] The sides of the first sieve plate 13, the second sieve plate 14 and the third sieve plate 15 are located below the processing box 3 and are symmetrically fixedly connected to the limiting posts. There are six limiting posts, which are slidably connected to the movable block 7. It should be noted that the setting of the limiting column can limit the movement of the movable block 7, ensuring that the rack column 114 and the adjustment plate 113 can be stably adjusted and moved.

[0023] The surface of the stirring column 6 is located above the rotating block 9 and is rotatably connected to a mounting ring 611. The mounting ring 611 is slidably connected to the bottom of the processing box 3. The surface of the mounting ring 611 is fixedly connected to a first rack 612 that is evenly distributed in an annular shape. The surface of the first rack 612 is meshedly connected to a first gear 613. The surface of the first gear 613 is rotatably connected to a mounting seat 614. Multiple mounting seats 614 are all fixedly connected to the bottom of the processing box 3. The surface of the discharge port 5 is equipped with a cover plate 615 that is evenly distributed in an annular shape. The cover plate 615 is fixedly connected to the first gear 613. It should be noted that in the process of the first motor 63 driving the stirring column 6 to rotate, due to the rotational connection between the mounting ring 611 and the stirring column 6, the rotation of the stirring column 6 cannot drive the mounting ring 611 to rotate. In the process of the movable sleeve 66 contacting the arc block and generating relative rotation, the stirring column 6 and the mounting ring 611 move upward together, and the first rack 612 cooperates with the first gear 613 to drive the cover plate 615 to rotate, thereby realizing automatic unloading of the asphalt concrete aggregate after stirring and crushing treatment, and when the asphalt concrete aggregate slides to the surface of the first screen plate 13, since the L-shaped column 110 rotates with the rotation of the stirring column 6, the multiple second fixed rods 111 can spread the asphalt concrete aggregate to avoid the asphalt concrete aggregate from being concentrated and stacked during the screening process, thereby further ensuring the screening effect.

[0024] A ring 621 is fixedly connected to the surface of the transmission column 62 below the first motor 63. A third spring is fixedly connected below the ring 621. The lower end of the third spring is fixedly connected to the stirring column 6. It should be noted that the initial state of the third spring is a compressed state. The reaction force generated by the compression of the third spring acts on the surface of the stirring column 6, so that the cover plate 615 can be in a stable state when feeding into the processing box 3. When the cover plate 615 is adjusted and rotated, the asphalt concrete aggregate in the processing box 3 that has been stirred and crushed is discharged from the discharge port 5 and placed on the surface of the first sieve plate 13. The stirring column 6 is adjusted to move upward, and the third spring is further compressed. Since the contact area between the rectangular groove 61 and the transmission column 62 increases, the friction force also increases. After the movable sleeve 66 separates from the arc plate 610, the stirring column 6 will not reset immediately, ensuring that the asphalt concrete aggregate is discharged stably. Under the elastic force of the second spring 65, the movable sleeve 66 can be reset.

[0025] It should be noted that the driving mechanism 12 is similar to the driving structure of the existing asphalt concrete aggregate screening equipment, including a second motor, an eccentric block and other structures. It is an existing mature technology and will not be repeated here. The support frame includes a mounting frame and a support spring for the screen plate. When the second motor drives the eccentric block to rotate, the support spring can continuously deform to ensure that the entire screening process proceeds smoothly; a controller can be installed next to the mounting plate 2 on the upper surface of the base plate, and the first motor 63 and the second motor are electrically connected to the controller, and the controller is controlled by a computer.

[0026] The basic principles, main features, and advantages of the present invention are shown and described above. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The above embodiments and descriptions are merely illustrative of the principles of the present invention. Various changes and modifications may be made to the present invention without departing from the spirit and scope of the present invention. Such changes and modifications are intended to fall within the scope of the present invention. The scope of protection claimed in the present invention is defined by the appended claims and their equivalents.

Claims

1. An asphalt concrete aggregate grading screening device, comprising a base plate (1), a support frame (11) fixedly connected to the upper surface of the base plate (1), a driving mechanism (12) arranged in the middle of the upper surface of the base plate (1), and a first sieve plate (13), a second sieve plate (14), a third sieve plate (15) and a receiving plate (16) fixedly connected to the surface of the support frame (11), characterized in that: A mounting plate (2) is fixedly connected to the left side of the upper surface of the base plate (1); a processing box (3) is fixedly connected to the end of the surface of the mounting plate (2) away from the base plate (1); a feed port (4) is provided on the surface of the processing box (3); a discharge port (5) is provided at the bottom of the processing box (3); and a stirring column (6) for stirring agglomerated asphalt concrete aggregate is rotatably connected to the top of the processing box (3); The sides of the first sieve plate (13), the second sieve plate (14) and the third sieve plate (15) are symmetrically and slidably connected to movable blocks (7), the surface of the movable block (7) is provided with a circular hole (71), the hole wall of the circular hole (71) is fixedly connected to a cylinder (72), wherein a movable frame (8) is fixedly connected between two of the cylinders (72), and a rotating block (9) is cooperatively installed on the inner wall of the movable frame (8), and the rotating block (9) is fixedly connected to the side of the surface of the stirring column (6) close to the first sieve plate (13), and the third sieve plate (15) is fixedly connected to the surface of the stirring column (6) close to the first sieve plate (13). The side surfaces of the first sieve plate (13), the second sieve plate (14) and the third sieve plate (15) are located on the right side of the movable block (7) and are rotatably connected to a pressure roller (10) and a rotating column (17); the surface of the rotating column (17) is fixedly connected to a first fixed rod (171) uniformly distributed in an annular shape; the surfaces of the first sieve plate (13), the second sieve plate (14) and the third sieve plate (15) are located between the movable block (7) and the pressure roller (10) and are provided with vertical holes (18); the walls of the two vertical holes (18) are slidably connected to pressure plates (19); An L-shaped column (110) is fixedly connected to the end surface of the stirring column (6) close to the first sieve plate (13), and a plurality of second fixing rods (111) are fixedly connected below the L-shaped column (110).

2. The asphalt concrete aggregate grading and screening device according to claim 1, characterized in that: The support frame (11) is symmetrically fixedly connected to one end of the surface close to the mounting plate (2) with a first spring (112), and the other end of the first spring (112) is fixedly connected to the adjustment plate (113). The three cylinders (72) are fixedly connected to the adjustment plate (113), and the surface of the adjustment plate (113) away from the first spring (112) is equidistantly fixedly connected to a rack column (114). The top of the rack column (114) is meshed with a transmission gear (115). There are twelve transmission gears (115). Both ends of the pressure roller (10) are fixedly connected to the transmission gear (115). Both ends of the rotating column (17) are rotatably connected to the transmission gear (115) through a one-way bearing. The surface of the rack column (114) is located on the left side of the transmission gear (115) and is fixedly connected to a limiting ring (116). The two limiting rings (116) are slidably connected to the pressure plate (19).

3. The asphalt concrete aggregate grading and screening device according to claim 2, characterized in that: The initial state of the first spring (112) is a compressed state.

4. The asphalt concrete aggregate grading and screening device according to claim 1, characterized in that: A rectangular groove (61) is provided on the upper end surface of the stirring column (6), a driving column (62) is slidably connected to the groove wall of the rectangular groove (61), and a first motor (63) is mounted on the upper end of the driving column (62).

5. The asphalt concrete aggregate grading and screening device according to claim 4, characterized in that: The end of the surface of the stirring column (6) close to the first motor (63) is fixedly connected to a transverse column (64), and a second spring (65) is sleeved on the outer side of the transverse column (64). One end of the second spring (65) is fixedly connected to the stirring column (6), and the other end of the second spring (65) is fixedly connected to a movable sleeve (66). The movable sleeve (66) is slidably connected to the transverse column (64). The end of the movable sleeve (66) close to the stirring column (6) is fixedly connected to a connecting column (67), and the end of the surface of the connecting column (67) away from the movable sleeve (66) is fixedly connected to a convex column (68). The upper surface of the top of the processing box (3) is fixedly connected to a limit bar (69), and the convex column (68) is installed in conjunction with the limit bar (69). The top of the processing box (3) is fixedly connected to an arc plate (610) near the edge, and the surface of the arc plate (610) away from the processing box (3) is fixedly connected to an L-shaped frame plate, and the L-shaped frame plate is fixedly connected to the first motor (63).

6. The asphalt concrete aggregate grading and screening device according to claim 1, characterized in that: The side surfaces of the first sieve plate (13), the second sieve plate (14) and the third sieve plate (15) are located below the processing box (3) and are symmetrically fixedly connected to limiting columns. There are six limiting columns, and the limiting columns are slidably connected to the movable block (7).

7. The asphalt concrete aggregate grading and screening device according to claim 1, characterized in that: The surface of the stirring column (6) is located above the rotating block (9) and is rotatably connected to a mounting ring (611). The mounting ring (611) is slidably connected to the bottom of the processing box (3). The surface of the mounting ring (611) is fixedly connected to a first rack (612) uniformly distributed in an annular shape. The surface of the first rack (612) is meshedly connected to a first gear (613). The surface of the first gear (613) is rotatably connected to a mounting seat (614). Multiple mounting seats (614) are fixedly connected to the bottom of the processing box (3). The surface of the discharge port (5) is cooperatively installed with a cover plate (615) uniformly distributed in an annular shape. The cover plate (615) is fixedly connected to the first gear (613).

8. The asphalt concrete aggregate grading and screening device according to claim 4, characterized in that: A ring (621) is fixedly connected to the surface of the transmission column (62) below the first motor (63), a third spring is fixedly connected below the ring (621), and the lower end of the third spring is fixedly connected to the stirring column (6).

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