A semi-automatic long aluminum profile conveyor

Abstract

The present invention discloses a semi-automatic long aluminum profile conveyor, which includes a gantry fixed frame. A plurality of groups of first belt conveyors are arranged on the right side of the gantry fixed frame. Two bases are arranged below the gantry fixed frame, and the same group of second belt conveyors is erected between the two bases. The same positioning component is arranged on the brackets of the plurality of groups of first belt conveyors. In the present invention, the long aluminum profiles are conveyed to the positioning component by the plurality of groups of first belt conveyors, and the long aluminum profiles are transferred to the second belt conveyor by the linear guide rail in cooperation with the adjusting mechanism and the profile clamping mechanism, which is convenient for clamping and transporting long aluminum profiles of different specifications, replaces manual handling of long aluminum profiles for transportation, reduces labor intensity, and limits the long aluminum profiles on the second belt conveyor by the T-shaped block in cooperation with the compression spring and the arc-shaped positioning block, replacing the hydraulic-driven limiting plate to limit the long aluminum profiles, ensuring the smooth transportation of the long aluminum profiles and avoiding damage to the long aluminum profiles.

Description

Technical Field

[0001] The present invention relates to the technical field of conveyors, and particularly relates to a semi - automatic long aluminum profile conveyor. Background Art

[0002] Aluminum profiles are aluminum materials obtained by melting and extruding aluminum rods to get different cross - sectional shapes. The production process of aluminum profiles mainly includes three processes: melting and casting, extrusion, and coloring. Long aluminum profiles need to be transported by a conveyor during production and processing.

[0003] In the prior art, such as patent number CN115258267A, a conveyor for packaging aluminum profiles is disclosed. It slides the sliding adjustment frame outside the protective shell, uses bolts to fix the support plate at the top of the chassis, and the moving wheels at the bottom of the support plate facilitate personnel to move the device... Start the electric push rod to drive the limit plate to move, so as to adjust the position of the aluminum profile. The illuminating lamp at the bottom of the support plate can illuminate the surface of the aluminum profile to prevent the detection effect from being affected by dim light. The technical solutions of the above patent have the following deficiencies: 1. It requires manual movement of long aluminum profiles onto the conveyor for transmission, resulting in high labor intensity; 2. Using hydraulic drive to limit the long aluminum profile by the limit plate is likely to cause damage to the long aluminum profile and affect the transmission effect; 3. It is not convenient to clean and collect impurities on the long aluminum profile in a timely manner. Summary of the Invention

[0004] In view of the deficiencies and defects in the prior art, the present invention proposes a semi - automatic long aluminum profile conveyor to solve the technical problems raised in the background art.

[0005] To achieve the above object, the present invention adopts the following technical solutions:

[0006] A semi - automatic long aluminum profile conveyor includes a gantry fixed frame. A plurality of first belt conveyors are provided on the right side of the gantry fixed frame. Two bases are provided below the gantry fixed frame, and the same set of second belt conveyor is installed between the two bases. A positioning component is provided on the brackets of the plurality of first belt conveyors. A linear guide rail is fixedly installed at the lower end of the gantry fixed frame at the central position. A hydraulic cylinder is provided on the linear guide rail. An adjustable profile clamping mechanism is provided at the lower end of the piston rod of the hydraulic cylinder. Limiting components for long aluminum profiles are provided on the opposite side walls of the two bases above the second belt conveyor. A cleaning mechanism for long aluminum profiles is also provided between the two bases.

[0007] Preferably, the plurality of first belt conveyors are all inclined, and the plurality of first belt conveyors are all perpendicular to the second belt conveyor.

[0008] Preferably, the positioning component includes an L-shaped support plate fixedly connected to the inner side brackets of multiple groups of first belt conveyors on the side within the gantry fixing frame. An arc-shaped limiting platform is fixedly connected to the side wall of the vertical section of the L-shaped support plate. The arc-shaped end face of the arc-shaped limiting platform faces the first belt conveyor, and the horizontal end face of the arc-shaped limiting platform is on the same horizontal plane as the first belt conveyor.

[0009] Preferably, a moving guide block matching the linear guide rail is provided on the linear guide rail. The lower end of the moving guide block is fixedly connected with a U-shaped support seat. The hydraulic cylinder is fixedly installed on the horizontal section of the U-shaped support seat. The lower end of the piston rod of the hydraulic cylinder vertically penetrates through the horizontal section of the U-shaped support seat.

[0010] Preferably, the profile clamping mechanism includes a support platform fixedly installed at the lower end of the piston rod of the hydraulic cylinder. An adjusting mechanism is provided on the support platform. Two frame-shaped frames are provided on the adjusting mechanism. A plurality of covers are fixedly connected to the opposite side walls of the two frame-shaped frames. A rotating rod is horizontally rotatably penetrated between each of the plurality of covers and the frame-shaped frame. Two circular blocks are rotatably sleeved at one end of each of the plurality of rotating rods located inside the covers. A connecting block is fixedly connected to each of the plurality of circular blocks close to the frame-shaped frame. A plurality of air cylinders are fixedly installed at the upper end of the frame-shaped frame. A fixing block is fixedly connected to the piston rod of each of the plurality of air cylinders. Each of the plurality of fixing blocks is fixedly connected to each of the plurality of connecting blocks. An L-shaped clamping block is fixedly connected to the lower end of each of the plurality of circular blocks.

[0011] Preferably, the adjusting mechanism includes a cavity provided in the support platform. An opening is provided at the bottom of the cavity. A bidirectional screw rod is horizontally rotatably penetrated through the left and right inner side walls of the cavity. A servo motor for driving is fixedly installed on the right side wall of the support platform. The driving shaft of the servo motor is fixedly connected to one end of the bidirectional screw rod located outside the cavity. Two support blocks are threadedly sleeved on the bidirectional screw rod. The lower ends of the two support blocks are respectively fixedly connected to the upper ends at the central positions of the two frame-shaped frames.

[0012] Preferably, a limiting groove is provided on the top surface of the cavity. The upper ends of the two support blocks are inserted into the limiting groove and are in sliding contact with each other. The limiting groove and the opening are both set to be of the same length as the threaded section of the bidirectional screw rod.

[0013] Preferably, the limiting component includes a T-shaped block horizontally penetrating through the two bases. Both T-shaped blocks are located above the second belt conveyor. Arc-shaped positioning blocks are fixedly connected to the opposite side walls of the two T-shaped blocks. Two compression springs are fixedly connected between each of the two T-shaped blocks and the two bases. The arc-shaped positioning block is made of elastic rubber.

[0014] Preferably, the cleaning mechanism includes a U-shaped frame fixedly connected to the upper ends of the two bases respectively and an uncovered recovery tank arranged below the second belt conveyor. The U-shaped frame is arranged on the rear side wall close to the base. A plurality of brush bars are fixedly connected to the lower end of the horizontal section of the U-shaped frame. A rectangular through groove is provided on the side wall of one of the bases. The rectangular through groove is located above the second belt conveyor and is close to the U-shaped frame. A micro fan is fixedly installed in the rectangular through groove, and a dust-proof net is fixedly installed on the inner wall of the rectangular through groove close to the brush bars.

[0015] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0016] 1. The long aluminum profiles are conveyed to the positioning component by multiple groups of first belt conveyors, and the linear guide rail cooperates with the adjusting mechanism and the profile clamping mechanism to transfer the long aluminum profiles to the second belt conveyor, which is convenient for clamping and transporting long aluminum profiles of different specifications, replacing manual handling of long aluminum profiles for transportation and reducing labor intensity.

[0017] 2. The T-shaped block cooperates with the compression spring and the arc-shaped positioning block to limit the long aluminum profiles on the second belt conveyor, replacing the hydraulic-driven limiting plate to limit the long aluminum profiles, ensuring the stable transmission of the long aluminum profiles and avoiding damage to the long aluminum profiles.

[0018] 3. The brush bars on the U-shaped frame are used to clean the long aluminum profiles, and the micro fan in the rectangular through groove blows the impurities cleaned into the uncovered recovery tank for collection, which is convenient for timely cleaning and collecting the impurities on the long aluminum profiles. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 is a perspective schematic diagram of a semi-automatic long aluminum profile conveyor proposed by the present invention;

[0020] Figure 2 is a structural schematic diagram of the positioning component of a semi-automatic long aluminum profile conveyor proposed by the present invention;

[0021] Figure 3 is Figure 1 a partial enlarged view of A in

[0022] Figure 4 is a structural schematic diagram of the profile clamping mechanism of a semi-automatic long aluminum profile conveyor proposed by the present invention;

[0023] Figure 5 is a structural schematic diagram of the rotating rod, circular block and L-shaped clamping block of a semi-automatic long aluminum profile conveyor proposed by the present invention;

[0024] Figure 6 is Figure 1 a partial enlarged view of B in

[0025] Figure 7 This is a schematic structural diagram of the second belt conveyor and the cleaning mechanism of a semi-automatic long aluminum profile conveyor proposed by the present invention.

[0026] In the figure: 1 gantry fixing frame, 2 first belt conveyor, 3 base, 4 second belt conveyor, 5 linear guide rail, 6 hydraulic cylinder, 7 L-shaped support plate, 8 arc-shaped limiting platform, 9 movable guide block, 10 U-shaped support seat, 11 support table, 12 frame-shaped frame, 13 cover body, 14 rotating rod, 15 circular block, 16 connecting block, 17 cylinder, 18 fixed block, 19 L-shaped clamping block, 20 cavity, 21 opening, 22 bidirectional screw rod, 23 servo motor, 24 support block, 25 limiting groove, 26 T-shaped block, 27 arc-shaped positioning block, 28 compression spring, 29 U-shaped frame, 30 lidless recovery tank, 31 brush strip, 32 rectangular through groove, 33 micro fan, 34 dust-proof net. Specific embodiments

[0027] In the description of the present invention, it should be understood that the orientation or positional relationship indicated by the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present invention.

[0028] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments.

[0029] Refer to Figure 1-7As shown in the figure, a semi-automatic long aluminum profile conveyor includes a gantry fixed frame 1. There are multiple groups of first belt conveyors 2 on the right side of the gantry fixed frame 1. There are two bases 3 below the gantry fixed frame 1. A same group of second belt conveyors 4 is installed between the two bases 3. Multiple groups of first belt conveyors 2 are all inclined. The multiple groups of inclined first belt conveyors 2 are used to convey long aluminum profiles to the side of the second belt conveyor 4. Multiple groups of first belt conveyors 2 are all perpendicular to the second belt conveyor 4. There is a same positioning component on the brackets of multiple groups of first belt conveyors 2. The positioning component includes an L-shaped support plate 7 fixedly connected to the brackets on the inner side of multiple groups of first belt conveyors 2 within the gantry fixed frame 1. An arc-shaped limiting platform 8 is fixedly connected to the side wall of the vertical section of the L-shaped support plate 7. The arc-shaped end face of the arc-shaped limiting platform 8 faces the first belt conveyor 2. The horizontal end face of the arc-shaped limiting platform 8 is on the same horizontal plane as the first belt conveyor 2. The horizontal end face of the arc-shaped limiting platform 8 is used to temporarily place long aluminum profiles and cooperate with the L-shaped support plate 7 to position the long aluminum profiles, facilitating subsequent transfer to the second belt conveyor 4.

[0030] A linear guide rail 5 is fixedly installed at the lower end of the gantry fixed frame 1 at the central position. There is a hydraulic cylinder 6 on the linear guide rail 5. The model of the hydraulic cylinder 6 is: HOB100*200. The hydraulic cylinder 6 is used to drive the adjusting mechanism and the profile clamping mechanism to perform vertical lifting. There is a matching movable guide block 9 on the linear guide rail 5. The linear guide rail 5 cooperates with the movable guide block 9 to drive the hydraulic cylinder 6 on the U-shaped support seat 10, as well as the adjusting mechanism and the profile clamping mechanism to perform horizontal movement adjustment. The model of the linear guide rail 5 is: SKR14. The lower end of the movable guide block 9 is fixedly connected to a U-shaped support seat 10. The hydraulic cylinder 6 is fixedly installed on the horizontal section of the U-shaped support seat 10. The lower end of the piston rod of the hydraulic cylinder 6 vertically penetrates the horizontal section of the U-shaped support seat 10.

[0031] At the lower end of the piston rod of the hydraulic cylinder 6, an adjustable profile clamping mechanism is provided. The profile clamping mechanism includes a support table 11 fixedly installed at the lower end of the piston rod of the hydraulic cylinder 6. An adjustment mechanism is provided on the support table 11. Two frame-shaped frames 12 are provided on the adjustment mechanism. The frame-shaped frames 12 are used to install multiple groups of circular blocks 15 and L-shaped clamping blocks 19. A number of covers 13 are fixedly connected to the opposite side walls of the two frame-shaped frames 12. A rotating rod 14 is horizontally rotatably penetrated between each number of covers 13 and the frame-shaped frame 12. The rotating rod 14 facilitates the cooperation of the air cylinder 17 with the fixed block 18 and the connecting block 16 to drive the circular block 15 to rotate. At one end of each number of rotating rods 14 located inside the cover 13, two circular blocks 15 are rotatably sleeved. A connecting block 16 is fixedly connected to each number of circular blocks 15 close to the frame-shaped frame 12. A number of air cylinders 17 are fixedly installed at the upper end of the frame-shaped frame 12. The model of the air cylinder 17 is: SCD32x50-50-LB. The air cylinder 17 cooperates with the fixed block 18 and the connecting block 16 to drive the circular block 15 to rotate on the rotating rod 14, so that the horizontal section of the L-shaped clamping block 19 abuts against the lower end surface of the long aluminum profile, effectively clamping and positioning the long aluminum profile. A fixed block 18 is fixedly connected to the piston rod of each number of air cylinders 17. Each number of fixed blocks 18 is fixedly connected to each number of connecting blocks 16 respectively. An L-shaped clamping block 19 is fixedly connected to the lower end of each number of circular blocks 15.

[0032] The adjustment mechanism includes a cavity 20 provided in the support table 11. An opening 21 is provided at the bottom of the cavity 20. A bidirectional screw rod 22 is horizontally rotatably penetrated through the left and right inner walls of the cavity 20. A servo motor 23 for driving is fixedly installed on the right side wall of the support table 11. The model of the servo motor 23 is: MSME-012S1. The servo motor 23 is used to drive the bidirectional screw rod 22 to rotate, so that the bidirectional screw rod 22 drives two support blocks 24 screwed thereon to move horizontally relative to or away from each other along the opening 21 under the limiting effect of the limiting groove 25, so that the two support blocks 24 drive the two frame-shaped frames 12 to move relatively and adjust, facilitating the adjustment of the L-shaped clamping block 19 to the width position adapted to the long aluminum profile, and facilitating the clamping and positioning of long aluminum profiles of different specifications. The driving shaft of the servo motor 23 is fixedly connected to one end of the bidirectional screw rod 22 located outside the cavity 20. Two support blocks 24 are screwed on the bidirectional screw rod 22. The lower ends of the two support blocks 24 are respectively fixedly connected to the upper ends of the central positions of the two frame-shaped frames 12. A limiting groove 25 is provided on the top surface of the cavity 20. The upper ends of the two support blocks 24 are inserted into the limiting groove 25 and are in sliding abutting contact. The limiting groove 25 and the opening 21 are both arranged to be of the same length as the threaded section of the bidirectional screw rod 22. The limiting groove 25, the opening 21 and the threaded section of the bidirectional screw rod 22 arranged to be of the same length can limit the range of distance adjustment between the two frame-shaped frames 12 and the two relative L-shaped clamping blocks 19.

[0033] On the opposite side walls of the two bases 3 located above the second belt conveyor 4, there are limit components for long aluminum profiles. The limit components include T-shaped blocks 26 horizontally penetrating through the two bases 3. Both of the two T-shaped blocks 26 are located above the second belt conveyor 4. Arc-shaped positioning blocks 27 are fixedly connected to the opposite side walls of the two T-shaped blocks 26. Two compression springs 28 are fixedly connected between the two T-shaped blocks 26 and the two bases 3. The arc-shaped positioning blocks 27 are made of elastic rubber. The arc-shaped positioning blocks 27 made of elastic rubber cooperate with the compression springs 28 to limit the long aluminum profiles, replacing the hydraulic-driven limit plate to limit the long aluminum profiles, ensuring the stable transmission of the long aluminum profiles and avoiding damage to the long aluminum profiles.

[0034] A cleaning mechanism for long aluminum profiles is also provided between the two bases 3. The cleaning mechanism includes a U-shaped frame 29 fixedly connected to the upper ends of the two bases 3 respectively and an uncovered recovery tank 30 arranged below the second belt conveyor 4. The U-shaped frame 29 is arranged close to the rear side wall of the base 3. A plurality of brush bars 31 are fixedly connected to the lower end of the horizontal section of the U-shaped frame 29. During the process of the second belt conveyor 4 transporting the long aluminum profiles, the long aluminum profiles are cleaned by the plurality of brush bars 31 on the U-shaped frame 29, and the impurities cleaned are blown into the uncovered recovery tank 30 by the micro fan 33 in the rectangular through groove 32 for collection, facilitating the timely cleaning and collection of the impurities on the long aluminum profiles. A rectangular through groove 32 is provided on the side wall of one of the bases 3. The rectangular through groove 32 is located above the second belt conveyor 4 and is close to the U-shaped frame 29. A micro fan 33 is fixedly installed in the rectangular through groove 32. The micro fan 33 is used to blow the impurities cleaned from the long aluminum profiles into the uncovered recovery tank 30 below the second belt conveyor 4. The micro fan 33 is a prior art and will not be elaborated here. A dust-proof net 34 is fixedly installed on the inner wall of the rectangular through groove 32 close to the brush bars 31. The dust-proof net 34 can prevent impurities from entering the rectangular through groove 32.

[0035] When the present invention is in use, manually lift the long aluminum profile and place it at the inclined low position of multiple groups of first belt conveyors 2. Start multiple groups of first belt conveyors 2 to convey the long aluminum profile to the horizontal end surface of the arc-shaped limiting platform 8, and cooperate with the side of the L-shaped support plate 7 for limiting. Start the linear guide rail 5 and cooperate with the movable guide block 9 to move the adjusting mechanism and the profile clamping mechanism to directly above the arc-shaped limiting platform 8. Start the hydraulic cylinder 6 on the U-shaped support seat 10, so that the hydraulic cylinder 6 drives the adjusting mechanism and the profile clamping mechanism to descend to the side of the long aluminum profile until the horizontal section of the L-shaped clamping block 19 can be inserted into the lower end surface of the long aluminum profile. Start the servo motor 23 to drive the bidirectional screw rod 22 to rotate, so that the bidirectional screw rod 22 drives the two support blocks 24 sleeved with threads to relatively move along the opening 21 under the limiting effect of the limiting groove 25, and the two support blocks 24 drive the two frame-shaped frames 12 to relatively move until the horizontal sections of several L-shaped clamping blocks 19 on both sides respectively abut against the left and right end side walls of the long aluminum profile. Start several air cylinders 17 and cooperate with the fixed block 18 and the connecting block 16 to drive the circular block 15 on the rotating rod 14 to rotate, so that the circular block 15 rotates to drive the horizontal section of one side L-shaped clamping block 19 to abut against the lower end of the long aluminum profile, so that several L-shaped clamping blocks 19 clamp and position the long aluminum profile. Start the hydraulic cylinder 6 again to drive the long aluminum profile to rise, and start the linear guide rail 5 and cooperate with the support platform 11 and the frame-shaped frame 12 to drive the long aluminum profile to move above the second belt conveyor 4. Start the hydraulic cylinder 6 to place the long aluminum profile on the second belt conveyor 4, which is convenient for clamping and transporting long aluminum profiles of different specifications, replacing manual handling of long aluminum profiles for transportation and reducing labor intensity. Start several air cylinders 17 again and cooperate with the circular block 15 to drive the L-shaped clamping block 19 to reset, and start the servo motor 23 again to drive the L-shaped clamping block 19 to separate from the long aluminum profile. Start the hydraulic cylinder 6 and cooperate with the support platform 11 and the frame-shaped frame 12 to drive the L-shaped clamping block 19 to rise and reset. Start the second belt conveyor 4 to convey the long aluminum profile. When the long aluminum profile moves to abut against the arc-shaped positioning block 27, it drives the T-shaped block 26 to stretch the compression spring 28, so that the arc-shaped positioning block 27 of the elastic rubber product cooperates with the compression spring 28 to limit the long aluminum profile, replacing the hydraulic-driven limiting plate to limit the long aluminum profile, ensuring the smooth transportation of the long aluminum profile and avoiding damage to the long aluminum profile. During the process of the second belt conveyor 4 conveying the long aluminum profile, several brush strips 31 on the U-shaped frame 29 clean the long aluminum profile, and the micro fan 33 in the rectangular through groove 32 blows the impurities cleaned into the uncovered recovery tank 30 for collection, which is convenient for timely cleaning and collecting the impurities on the long aluminum profile.

[0036] The above is only the preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present invention, according to the technical solution of the present invention and its inventive concept, makes equivalent substitutions or changes, and all should be covered within the protection scope of the present invention.

Claims

1. A semi-automatic long aluminum profile conveyor, comprising a door-type fixed frame (1), a plurality of first belt conveyors (2) are provided on the right side of the door-type fixed frame (1), two bases (3) are provided below the door-type fixed frame (1), and a second belt conveyor (4) of the same group is provided between the two bases (3), characterized in that: The brackets of the plurality of first belt conveyors (2) are provided with a same positioning assembly, the lower end of the door-shaped fixed frame (1) located at the center position is fixedly installed with a linear guide rail (5), the linear guide rail (5) is provided with a hydraulic cylinder (6), the lower end of the piston rod of the hydraulic cylinder (6) is provided with an adjustable profile clamping mechanism, the two bases (3) are provided with a limit assembly for long aluminum profiles on the opposite side walls above the second belt conveyor (4), and a cleaning mechanism for long aluminum profiles is also provided between the two bases (3), the plurality of first belt conveyors (2) are all arranged in an inclined manner, the plurality of first belt conveyors (2) are all arranged perpendicular to the second belt conveyor (4), the positioning assembly includes a fixed connection to the plurality of first belt conveyors (2) An L-shaped support plate (7) is located on a side bracket inside the door-shaped fixed frame (1), and an arc-shaped limit platform (8) is fixedly connected to the side wall of the vertical section of the L-shaped support plate (7), and the arc-shaped end face of the arc-shaped limit platform (8) is arranged toward the first belt conveyor (2), and the horizontal end face of the arc-shaped limit platform (8) is on the same horizontal plane as the first belt conveyor (2). The linear guide rail (5) is provided with a movable guide block (9) matching it, and the lower end of the movable guide block (9) is fixedly connected to a U-shaped support seat (10), and the hydraulic cylinder (6) is fixedly installed on the horizontal section of the U-shaped support seat (10), and the lower end of the piston rod of the hydraulic cylinder (6) vertically penetrates the horizontal section of the U-shaped support seat (10), and the profile clamping mechanism includes The invention comprises a support platform (11) fixedly mounted on the lower end of the piston rod of the hydraulic cylinder (6), an adjustment mechanism is provided on the support platform (11), and two frame frames (12) are provided on the adjustment mechanism, and a plurality of covers (13) are fixedly connected to the opposite side walls of the two frame frames (12), and a rotating rod (14) is provided between the plurality of covers (13) and the frame frames (12) so as to rotate horizontally, and two circular blocks (15) are rotatably sleeved on one end of the plurality of rotating rods (14) located in the cover bodies (13), and a connecting block (16) is fixedly connected to the plurality of circular blocks (15) close to the frame frames (12), and a plurality of cylinders (17) are fixedly mounted on the upper end of the frame frames (12), and the piston rods of the plurality of cylinders (17) are fixedly mounted. A fixed block (18) is fixedly connected, and several of the fixed blocks (18) are fixedly connected to several connecting blocks (16) respectively. The lower ends of several of the circular blocks (15) are fixedly connected to L-shaped clamping blocks (19). The adjustment mechanism includes a cavity (20) arranged in the support platform (11), an opening (21) is provided on the bottom of the cavity (20), and a bidirectional screw rod (22) is horizontally rotated and penetrated on the left and right inner walls of the cavity (20). A servo motor (23) for driving is fixedly installed on the right side wall of the support platform (11), and a driving shaft of the servo motor (23) is fixedly connected to one end of the bidirectional screw rod (22) located outside the cavity (20). Two support blocks (24) are threadedly sleeved on the bidirectional screw rod (22).The lower ends of the two support blocks (24) are fixedly connected to the upper ends of the center positions of the two frame frames (12), and a limiting groove (25) is provided on the top surface of the cavity (20). The upper ends of the two support blocks (24) are inserted into the limiting groove (25) and slide against each other. The limiting groove (25) and the opening (21) are both set to be equal in length to the threaded section of the bidirectional screw rod (22). The limiting assembly includes a T-block (26) set horizontally through the two bases (3). The two T-blocks (26) are both located above the second belt conveyor (4). The opposite side walls of the two T-blocks (26) are fixedly connected with arc-shaped positioning blocks (27). Two compression springs (28) are fixedly connected between the two T-blocks (26) and the two bases (3). The arc-shaped positioning block (27) is made of elastic rubber. The cleaning mechanism includes a U-shaped frame (29) fixedly connected to the upper ends of the two bases (3) and a uncovered recovery trough (30) arranged below the second belt conveyor (4). The U-shaped frame (29) is arranged near the rear end side wall of the base (3). The lower end of the horizontal section of the U-shaped frame (29) is fixedly connected to a plurality of brush strips (31). A rectangular through-slot (32) is provided on the side wall of one of the bases (3). The rectangular through-slot (32) is located above the second belt conveyor (4) and is arranged near the U-shaped frame (29). A micro fan (33) is fixedly installed in the rectangular through-slot (32). A dustproof net (34) is fixedly installed on the inner wall of the rectangular through-slot (32) near the brush strip (31).

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