A vibrating screen for concrete processing

Abstract

The application discloses a vibrating screen for concrete treatment, which comprises a box body, a discharging mechanism, an upper vibrating screening mechanism, a lower vibrating screening mechanism, a vibrating mechanism, a supporting mechanism, a screen plate group and a controller, wherein the discharging mechanism, the upper vibrating screening mechanism and the lower vibrating screening mechanism are sequentially installed in the box body from top to bottom, the upper vibrating screening mechanism and the lower vibrating screening mechanism each comprise the vibrating mechanism, the supporting mechanism and the screen plate group, and the screen plate group is arranged in a front-rear sliding mode relative to the box body. The vibrating mechanism drives the screen plate group to reciprocate forward and backward to realize screening, the supporting mechanism is controlled to drive the screen plate group, so that the shape of the screen plate group is changed, that is, whether the screen plate group is in an upper convex shape or a lower concave shape, and the shape of the screen plate group of the lower vibrating screening mechanism is opposite to that of the upper vibrating screening mechanism. By controlling the action of the lifting mechanism, the relative position of the guide shell relative to the discharging cylinder can be changed.

Description

Technical Field

[0001] This invention relates to a vibrating screen, and more particularly to a vibrating screen for concrete processing. Background Technology

[0002] The raw materials for concrete mainly consist of cement, natural or manufactured sand, crushed stone or pebbles, and water. The particle size of the natural or manufactured sand must be less than 4.75 mm, while the particle size of the crushed stone or pebbles must be greater than 4.75 mm. These are collectively referred to as aggregates. During the raw material preparation process, screening devices are needed to screen the target aggregates; a vibrating screen is a common type of screening device.

[0003] Chinese invention patent application number 202510383161.1 discloses a sediment screening device for hydraulic engineering. This device "improves the screening effect of sediment of different particle sizes by setting a first vibration component and a second vibration component, enabling the first screen to vibrate and screen sediment with a large amplitude and low frequency, and enabling the second screen to vibrate and screen sediment with a low amplitude and high frequency." It also "extends the screening time of sediment on the first and second screens by setting a first swing component and a second swing component, thus improving the screening effect of sediment." Firstly, the device's feed pipe... The unchanged position relative to the screening box results in the material falling onto the first screen at a basically constant position, close to the center of the first screen, as seen in the attached diagram. This causes the wear on the top center of the first screen to be much greater than other parts, which is not conducive to the uniform and full utilization of the first screen and reduces its service life. Secondly, this device is suitable for screening mud and sand. If it is used for screening aggregates, the relatively dry aggregates are more likely to pile up after screening, with larger gaps between them, meaning they are not dense enough. This easily leads to wasted space and inconvenience in transportation and screening, highlighting the shortcomings of the existing technology. Summary of the Invention

[0004] The purpose of this invention is to provide a vibrating screen for concrete processing, so as to solve the technical problems of uneven wear and insufficient utilization of the screening mechanism of existing vibrating screens, which leads to reduced service life, and the technical problems of the inability to compact the material after screening to reduce the space occupied.

[0005] To achieve the above objectives, the present invention adopts the following technical solution: A vibrating screen for concrete processing includes a housing, a feeding mechanism, an upper vibrating screening mechanism, a lower vibrating screening mechanism, a vibrating mechanism, a supporting mechanism, a screen plate assembly, and a controller. The housing is equipped with the feeding mechanism, the upper vibrating screening mechanism, and the lower vibrating screening mechanism sequentially from top to bottom. The upper and lower vibrating screening mechanisms each include a vibrating mechanism, a supporting mechanism, and a screen plate assembly. The screen plate assembly slides back and forth relative to the housing and is supported by the supporting mechanism. The vibrating mechanism drives the supporting mechanism to vibrate the screen plate assembly back and forth to achieve screening. The screen holes of the screen plate assembly are vertically penetrating and can be deformed vertically by the supporting mechanism, resulting in an upwardly convex or downwardly concave shape. Both the upwardly convex and downwardly concave shapes extend in the front-to-back direction. The screening accuracy of the screen plate assembly in the lower vibrating screening mechanism is greater than that in the upper vibrating screening mechanism. The feeding mechanism includes a guide housing and a lower... The box includes a material channel, a feeding cylinder, a lifting mechanism, and a discharge port. A guide shell is installed in the upper part of the box. Each of the left and right sides of the guide shell has a feeding channel. The bottoms of the two feeding channels are vertical, and their upper parts converge upwards. A vertical feeding cylinder is slidably connected to the guide shell. The upper part of the feeding cylinder converges downwards, and its bottom is vertical. The feeding cylinder is slidably connected to the upper part of the box. A lifting mechanism is installed on both the guide shell and the feeding cylinder. The lifting mechanism drives the feeding cylinder to move up and down relative to the guide shell. Discharge ports are located on the left and right sides of the bottom of the feeding cylinder. The discharge ports on the left and right sides of the feeding cylinder can be connected to the two feeding channels respectively, and can be located below the two feeding channels and connected to the inner cavity of the box. The vibration mechanism is electrically driven. A controller is fixed to the box. The vibration mechanism is electrically connected to the controller, and the controller is connected to an external power source.

[0006] Based on the above technical solution, a guide protrusion is fixed at the bottom of the feeding cylinder. The guide protrusion is in the shape of a ridge with an acute apex extending forward and backward. The lifting mechanism is an electric push rod. Vertical electric push rods are fixed at the front and rear parts of the guide housing. The push rods of the two electric push rods are fixed to the front and rear parts of the feeding cylinder respectively, and are electrically connected to the controller through the excess cable. When the electric push rods extend and retract, they can drive the feeding cylinder to move up and down relative to the guide housing.

[0007] Based on the above technical solution, a support shaft is fixed at the bottom of the guide housing along the front-back direction, and a support roller is coaxially rotatably connected to the support shaft. A reduction motor is fixed at the front end of the housing along the front-back direction. The rotating shaft of the reduction motor is rotatably connected to the housing, and a cam is coaxially fixed to its rotating shaft. The cam rolls and rubs against the bottom of the support roller. The reduction motor is electrically connected to the controller.

[0008] Based on the above technical solution, the support mechanism includes a guide groove, a sliding seat, a hollow shaft, a decorative shaft, a support groove, a support frame, memory foam, a tension spring, a sieve plate, a rotary drive mechanism, and a discharge hopper. Two sets of guide grooves extend through the left and right sides of the box, one front and one back. The two corresponding guide grooves on the front and back sides of the box form a group. Each group of guide grooves is slidably connected to a sliding seat on the left and right sides. Each group of guide grooves corresponds to a set of sliding seats. Each group of sliding seats is rotatably connected to a hollow shaft in the front-back direction. The hollow shafts of each group of sliding seats are axially slidably connected to a decorative shaft. Support grooves are radially fixed to adjacent ends of each hollow shaft. Support frames are radially fixed to the middle parts of each decorative shaft. The support frames are slidably connected to the support grooves on the front and back sides. Memory foam is fixed to the left and right sides of the inner wall of the support groove. The memory foam always fills the gap between the support groove and the support frame and is always in contact with the support groove and the support frame. The sliding seats and the middle part of the box body are jointly fixed with a No. 1 tension spring. Under the elastic tension of the No. 1 tension spring, each sliding seat tends to move closer to the other side. The screen plate assembly includes multiple screen plates installed in the support frame. The vibration mechanism is used to drive the flower shaft to vibrate back and forth, thereby driving the support frame and the screen plate assembly to vibrate back and forth. The box body is also equipped with two rotary drive mechanisms. Each rotary drive mechanism is used to drive the hollow shafts corresponding to each other in each support mechanism to rotate and brake, thereby changing the included angle of the screen plate. The left and right ends of the support groove are flush with the left and right ends of the support frame. The support grooves and support frames of the left and right parts of the support mechanism can contact each other under the indirect pull of the No. 1 tension spring and rotate under the indirect drive of the rotary drive mechanism to realize the upward convexity and downward concavity of the screen plate assembly. The left and right parts of the box body are each provided with two discharge hoppers that run through the left and right sides and tilt outward and downward. The two discharge hoppers of the left and right parts of the box body are respectively located diagonally below the support frame.

[0009] Based on the above technical solution, the rotary drive mechanism includes a gear reducer, a first-stage speed-regulating motor, a driving bevel gear, a support base, a transmission shaft, a worm gear, a driven bevel gear, a worm wheel, and a baffle plate. Two gear reducers are fixed to the right side of the housing. The transmission shafts of the gear reducers are arranged in a front-to-back direction, with the input shaft horizontally aligned to the right. A first-stage speed-regulating motor is fixed to the right side of each gear reducer, and its shaft is coaxially fixed to the input shaft. Driving bevel gears are coaxially fixed to both the front and rear ends of the transmission shaft of the gear reducers. Two sets of support bases are fixed to the housing from top to bottom, with multiple horizontally corresponding support bases forming a group. Each of the two sets of support bases is rotatably connected to two transmission shafts. Each transmission shaft is axially slidably connected to a worm gear. A driven bevel gear is coaxially fixed to each hollow shaft, and the driven bevel gear meshes with the driving bevel gear. A worm gear is coaxially fixed to each hollow shaft, and the worm gear meshes with the worm. The first speed-regulating motor is electrically connected to the controller. When the first speed-regulating motor rotates, it is decelerated by a gear reducer. The meshing of the driving bevel gear and the driven bevel gear enables the two transmission shafts of a set of support seats to rotate simultaneously. When the two transmission shafts of a set of support seats are indirectly driven by the first speed-regulating motor and rotate simultaneously, the meshing of the worm and the worm gear enables the hollow shafts on the left and right sides of the support mechanism to rotate at the same speed but in opposite directions. Each sliding seat is fixed with a baffle plate, and each baffle plate is located in the housing and blocks the guide groove.

[0010] Based on the above technical solution, each of the support frames has a screen plate installed at both the front and rear. A pin is fixed at each of the left and right ends of the middle of the screen plate. The pins at both ends of the screen plate are coaxially arranged and rotatably connected to the support frame. The screen plate, through the rotatable connection with the support frame via the pins, can be flipped back and forth under external force. When the screen plate flips to be parallel to the support frame, it can close and seal the support frame. A detachable limiting bolt is threaded to the end of the screen plate near the discharge hopper. The limiting bolt is inserted through the support frame to limit the position of the screen plate relative to the support frame. Two maintenance windows are installed through the left and right sides of the housing. Each maintenance window is located diagonally above each support frame and is equipped with an openable and closable shielding component.

[0011] Based on the above technical solution, the support groove can contact the top of the discharge hopper, the shielding component includes a guide hopper, fastening bolts, and fastening screw holes, and each of the maintenance windows is respectively hinged to the left and right. The upper part of the guide hopper is vertical and the bottom is inclined downward and protruding into the box. Fastening bolts are inserted through the upper part of the guide hopper on the left and right. There are two fastening screw holes through the left and right parts of the box. The fastening bolts can be threaded into the fastening screw holes to realize the closure of the guide hopper and the maintenance window. After the fastening bolts are disengaged from the fastening screw holes, the guide hopper can be opened relative to the maintenance window by manually moving it. The support groove can contact the bottom of the guide hopper, and the upper part of the support grooves in the front and rear parts of the support frame converges downward towards the middle of the support frame.

[0012] Based on the above technical solution, the number of vibration mechanisms is two. Each vibration mechanism drives the spindles of two sets of support mechanisms to vibrate back and forth. Each vibration mechanism includes a mounting base, a second-generation speed-regulating motor, a support plate, a guide seat, a slider, an adjusting bolt, a drive shaft, and a drive frame. Two mounting bases are fixed to the front end of the housing. Each mounting base is fixed with a vertical second-generation speed-regulating motor. The shafts of the two second-generation speed-regulating motors are coaxially fixed with support plates. The two support plates are rotatably connected to the mounting bases, and their top ends are each fixed with radial guide seats. The two guide seats are horizontally slidably connected to sliders. Each slider is rotatably connected to an adjusting bolt, which is threaded through the slider and rotatably connected to the guide seat. A vertical drag shaft is fixed to the top of each slider. When the adjusting bolt rotates in both directions, the slider slides horizontally back and forth along the guide seat, thus changing the axial distance of the drag shaft relative to the support plate. Each drag shaft is rotatably connected to a horizontal drag frame. The left and right parts of the drag frame are slidably connected to the flower shaft. When the support plate rotates and the drag shaft is not coaxial with the support plate, the drag frame can drive the flower shaft to move back and forth. The two second-generation speed-regulating motors are electrically connected to the controller.

[0013] Based on the above technical solution, the box body has an upper opening and a lower opening running through it from top to bottom. Multiple support beams are fixed inside the box body along the front-to-back direction. The top of the support beams is flush with the bottom of the upper opening. The upper and lower openings are each located below two support mechanisms. Collection grooves are inserted into the upper and lower openings respectively and can be disengaged forward. The bottom of the collection groove in the upper opening is in contact with the top of the support beam, and the bottom of the collection groove in the lower opening is in contact with the bottom of the inner wall of the box body. A cover plate is hinged to the front of the box body and is connected to a baffle plate that rotates left and right. The cover plate can completely cover the upper opening. The baffle plate is located above and in front of the cover plate. When the baffle plate hangs down naturally, its rear end can abut against the front end of the cover plate. When the baffle plate is manually pushed upward, it can release the abutment against the front end of the cover plate.

[0014] Based on the above technical solution, two sets of horizontal support columns are fixed at the front end of the box. The support columns are arranged horizontally front to back, and each set supports the other side. The two sets of support columns are slidably connected to sliding frames. The two sliding frames are fixed with racks along the front to back. A second tension spring is fixed between the two sliding frames and the two sets of support columns. The sliding frames tend to move backward under the elastic tension of the second tension spring. Incomplete gear rings are coaxially fixed to the outer circumferential walls of the two support plates. The two incomplete gear rings intermittently mesh with the two racks. A pendulum is hinged to the left and right sides of the sliding frame. The virtual hinge axis of the pendulum is arranged horizontally left to right. A transmission arm is fixed to the left and right sides of the front end of the two collection tanks. When the sliding frame moves back and forth, it can drive the pendulum to swing back and forth. When the pendulum swings backward, it can strike the transmission arm. When the pendulum is manually pushed upward, it can move away from the transmission arm so as not to interfere with the back and forth movement of the collection tank.

[0015] Compared with the prior art, the present invention has the following advantages: The present invention achieves screening by driving the screen plate assembly to vibrate back and forth through a vibration mechanism, and drives the screen plate assembly by controlling the support mechanism, thereby changing the shape of the screen plate assembly, i.e., whether it is convex or concave, and making the shape of the screen plate assembly of the lower vibrating screening mechanism opposite to that of the screen plate assembly of the upper vibrating screening mechanism. By controlling the action of the lifting mechanism, the relative position of the guide housing to the feed cylinder can be changed, thereby controlling whether the discharge outlet is connected to the feed channel or directly connected to the inner cavity of the box, and thus changing the final position of the material falling on the screen plate assembly. In this way, the left and right sides and the middle of the screen plate assembly can receive the aggregate in time, making the wear more uniform than the prior art and making the screen plate assembly more fully utilized. Open the cover and control the rotation drive mechanism to bring the screen plate with the threaded connection limit bolt close to the maintenance window. Then remove the limit bolt and manually rotate the screen plate around the pin axis to make the bottom of the screen plate the top. Then install the limit bolt so that the bottom of the original screen plate can also directly contact the aggregate and accept wear, thereby making the wear more uniform, making fuller use, and extending the service life. By utilizing the counterclockwise rotation of the support plate and the intermittent meshing of the incomplete gear ring and rack, the sliding frame can move forward intermittently. When the incomplete gear ring and rack disengage, the sliding frame slides backward under the elastic tension of the second tension spring, thus realizing the reciprocating sliding of the sliding frame. Subsequently, under the action of inertia, the pendulum moves back and forth and swings back and forth. When the pendulum swings backward, it can strike the transmission arm, causing the collection trough to vibrate. This facilitates the uniform distribution and compaction of aggregate in the collection trough, reducing the waste of space and making the subsequent transportation and screening of aggregate more convenient. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the isometric structure of the present invention.

[0017] Figure 2 This is a schematic diagram of the front section structure of the present invention.

[0018] Figure 3 This is a schematic diagram showing the cooperation between the support column and the sliding frame of the present invention.

[0019] Figure 4 This is a schematic diagram showing the cooperation between the support frame and the sieve plate of the present invention.

[0020] Figure 5 This is a front cross-sectional view of the guide housing and the feed cylinder of the present invention.

[0021] Figure 6 A schematic diagram of the cooperation between the cover plate and the baffle of the present invention.

[0022] In the diagram: 1. Box body; 8. Guide housing; 9. Discharge channel; 10. Discharge cylinder; 12. Discharge port; 13. Controller; 14. Guide protrusion; 15. Electric push rod; 16. Support shaft; 17. Support roller; 18. Gear motor; 19. Cam; 20. Guide groove; 21. Sliding seat; 22. Hollow shaft; 23. Flower shaft; 24. Support groove; 25. Support frame; 26. Memory foam; 27. Tension spring No. 1; 28. Screen plate; 30. Discharge hopper; 31. Gear reducer; 32. Speed ​​regulating motor No. 1; 33. Drive bevel gear; 34. Support seat; 35. Transmission shaft; 36. Worm gear; 37. Driven gear. 38. Bevel gear, 39. Worm gear, 40. Pin, 41. Limit bolt, 42. Maintenance window, 43. Guide hopper, 44. Fastening bolt, 45. Fastening screw hole, 46. Mounting base, 47. No. 2 speed-regulating motor, 48. Support plate, 49. Guide seat, 50. Slider, 51. Adjusting bolt, 52. Drive shaft, 53. Drive frame, 54. Upper opening, 55. Lower opening, 56. Support beam, 57. Collection trough, 58. Cover plate, 59. Baffle, 60. Support column, 61. Sliding frame, 62. Rack, 63. No. 2 tension spring, 64. Incomplete gear ring, 65. Pendulum, 66. Transmission arm, 67. Baffle plate. Detailed Implementation

[0023] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0024] like Figures 1-6As shown, a vibrating screen for concrete processing includes a housing 1, a feeding mechanism, an upper vibrating screening mechanism, a lower vibrating screening mechanism, a vibrating mechanism, a support mechanism, a screen plate assembly, and a controller 13. The housing 1 is equipped with the feeding mechanism, the upper vibrating screening mechanism, and the lower vibrating screening mechanism sequentially from top to bottom. The upper and lower vibrating screening mechanisms each include a vibrating mechanism, a support mechanism, and a screen plate assembly. The screen plate assembly slides back and forth relative to the housing 1 and is supported by the support mechanism. The structure can drive the support mechanism to vibrate the screen plate assembly back and forth to achieve screening. The screen holes of the screen plate assembly are arranged vertically and can be deformed vertically by the support mechanism to form an upward convex shape and a downward concave shape. When the screen plate assembly is upward convex or downward concave, it extends in the front-back direction. The screening accuracy of the screen plate assembly of the lower vibrating screening mechanism is greater than that of the screen plate assembly of the upper vibrating screening mechanism. The feeding mechanism includes a guide housing 8, a feeding channel 9, a feeding cylinder 10, a lifting mechanism, and a discharge port 12. The upper part of the housing 1 is... The housing is equipped with a guide housing 8, and each of the left and right sides of the guide housing 8 is provided with a feeding channel 9. The bottoms of the two feeding channels 9 are vertical, and the upper parts are upwardly converging. A vertical feeding cylinder 10 is slidably connected to the guide housing 8. The upper part of the feeding cylinder 10 is downwardly converging, and the bottom is vertical. The feeding cylinder 10 is slidably connected to the upper part of the housing 1. The guide housing 8 and the feeding cylinder 10 are jointly equipped with a lifting mechanism. The lifting mechanism is used to drive the feeding cylinder 10 relative to the guide housing 1. The housing 8 moves up and down. The bottom of the feeding cylinder 10 has outlets 12 extending through it on the left and right sides. The outlets 12 on the left and right sides of the feeding cylinder 10 can be connected to the two feeding channels 9 respectively, and can be located below the two feeding channels 9 and connected to the inner cavity of the box 1. The vibration mechanism is electrically driven. The box 1 is fixed with a controller 13. The vibration mechanism is electrically connected to the controller 13. The controller 13 is connected to an external power supply. The controller 13 is a known existing technology, such as a microcontroller or an industrial control computer.

[0025] In use, the vibrating mechanism drives the screen plate assembly to vibrate back and forth to achieve screening. The support mechanism drives the screen plate assembly, thus changing its shape—whether it is convex or concave—and making the shape of the screen plate assembly in the lower vibrating screening mechanism opposite to that in the upper vibrating screening mechanism. By controlling the lifting mechanism, the relative position of the guide housing 8 to the discharge cylinder 10 can be changed, thus controlling whether the discharge outlet 12 is connected to the discharge channel 9 or directly to the inner cavity of the housing 1, thereby changing the final position of the aggregate falling onto the screen plate assembly. Specifically, when the screen plate assembly of the upper vibrating screening mechanism is concave, the screen plate assembly of the lower vibrating screening mechanism is convex, connecting the discharge outlet 12 to the discharge channel 9. At this time, the aggregate passes through the lower... The aggregate is discharged from the material channel 9 and falls onto the left and right sides of the screen plate assembly. Then, under gravity, the aggregate moves towards the center of the screen plate assembly, achieving screening during this movement. After passing through the screen holes, the aggregate falls onto the lower screen plate assembly, where it moves from the center to the left and right sides under gravity for finer screening. When the screen plate assembly of the upper vibrating screen mechanism convexes, the screen plate assembly of the lower vibrating screen mechanism concaves, directly connecting the discharge outlet 12 to the inner cavity of the housing 1. At this time, the aggregate is discharged through the feed cylinder 10 and falls to a position near the center of the screen plate assembly. Then, under gravity, the aggregate moves towards the left and right sides of the screen plate assembly, achieving screening during this movement. After passing through the screen holes, the aggregate falls onto the lower screen plate assembly, where it moves from the left and right sides to the center under gravity for finer screening. This allows the left and right sides or the center of the screen plate assembly to receive the aggregate immediately, resulting in more uniform wear compared to existing technologies and more efficient utilization of the screen plate assembly.

[0026] The bottom of the feed cylinder 10 is fixed with a guide protrusion 14. The guide protrusion 14 is a ridge shape with an acute angle extending from front to back. The lifting mechanism is an electric push rod 15. The front and rear parts of the guide housing 8 are each fixed with a vertical electric push rod 15. The push rods of the two electric push rods 15 are respectively fixed to the front and rear parts of the feed cylinder 10 and are respectively electrically connected to the controller 13 through the excess cable. When the electric push rod 15 extends or retracts, it can drive the feed cylinder 10 to move up and down relative to the guide housing 8.

[0027] Furthermore, the guide protrusion 14 allows the aggregate to separate to the left and right sides when passing through this point, and the acute-angled roof-like structure allows the aggregate to fall directly onto the screen plate group after being discharged through the outlet 12, so that it can be closer to the center of the screen plate group. The controller 13 controls the extension and retraction of the electric push rod 15, thereby adjusting the relative position of the guide housing 8 and the discharge cylinder 10, so that the outlet 12 is connected to the discharge channel 9 or directly connected to the inner cavity of the box 1.

[0028] The bottom of the guide housing 8 is fixed with a support shaft 16 along the front-back direction. The support shaft 16 is coaxially rotatably connected with a support roller 17. The front end of the housing 1 is fixed with a reduction motor 18 along the front-back direction. The rotating shaft of the reduction motor 18 is rotatably connected with the housing 1, and its rotating shaft is coaxially fixed with a cam 19. The cam 19 rolls and rubs against the bottom of the support roller 17. The reduction motor 18 is electrically connected to the controller 13.

[0029] Furthermore, by controlling the rotation of the geared motor 18, the support shaft 16 and the guide housing 8 can be moved up and down by the cooperation of the cam 19 and the support roller 17. This movement is further transmitted to the feed cylinder 10 through the lifting mechanism, thereby preventing the aggregate from being blocked and accumulated in the feed channel 9 or the feed cylinder 10, and ensuring that the screening operation proceeds smoothly.

[0030] The support mechanism includes guide grooves 20, sliding seats 21, hollow shafts 22, flower shafts 23, support grooves 24, support frames 25, memory foam 26, tension springs 27, sieve plates 28, rotary drive mechanisms, and discharge hoppers 30. Two sets of guide grooves 20 extend through the left and right sides of the box body 1, front and back. Two corresponding guide grooves 20 on the front and back sides of the box body 1 form a group. Each group of guide grooves 20 is slidably connected to sliding seats 21 on the left and right sides. Each group of sliding seats 21 forms a group, with each group of guide grooves 20 facing forward. A hollow shaft 22 is rotatably connected to the rear. Each set of sliding seats 21 has its hollow shaft 22 axially slidably connected to a spiral shaft 23. Adjacent ends of each hollow shaft 22 are radially fixed with support grooves 24. Support frames 25 are radially fixed to the middle portion of each spiral shaft 23. The support frames 25 are slidably connected to the support grooves 24 on the front and rear sides. Memory foam 26 is fixed to the left and right sides of the inner wall of each support groove 24. The memory foam 26 always fills the gap between the support groove 24 and the support frame 25, and interacts with the support groove 24 and the support frame 25. The support frame 25 is always in contact. A tension spring 27 is fixed to the sliding seat 21 and the portion of the housing 1 near the center. Under the elastic tension of the tension spring 27, each sliding seat 21 tends to move closer to the others. The sieve plate assembly includes multiple sieve plates 28 installed within the support frame 25. The vibration mechanism drives the flower shaft 23 to vibrate back and forth, thereby causing the support frame 25 and the sieve plate assembly to vibrate back and forth. The housing 1 is also equipped with two rotary drive mechanisms, each used to drive the corresponding left and right sides of each support mechanism. The hollow shaft 22 rotates and brakes to change the included angle of the screen plate 28. The left and right ends of the support groove 24 are flush with the left and right ends of the support frame 25. The support groove 24 and the support frame 25 on the left and right sides of the support mechanism can contact each other under the indirect pull of the No. 1 tension spring 27 and rotate under the indirect drive of the rotary drive mechanism to realize the upward convexity and downward concavity of the screen plate assembly. The left and right sides of the box body 1 are each provided with two discharge buckets 30 that pass through left and right and tilt outward and downward. The two discharge buckets 30 on the left and right sides of the box body 1 are respectively located diagonally below the support frame 25.

[0031] Furthermore, the hollow shaft 22 is driven by a rotary drive mechanism to rotate or brake, thereby causing the support groove 24, the flower shaft 23, the support frame 25, and the screen plate 28 to rotate or brake, thus changing the shape of the screen plate assembly, i.e., whether it is convex or concave. During the shape change, the sliding seat 21 is pulled by the No. 1 tension spring 27, which makes the support groove 24 and the support frame 25 on the left and right sides of the box 1 approach each other and contact each other, thereby reducing the leakage of aggregate from the concave screen plate assembly and ensuring the accuracy of screening. When the screen plate assembly is convex, the left and right sides of the screen plate assembly are located above the discharge hopper 30. At this time, the aggregate that has not passed through the screen holes can be discharged through the discharge hopper 30 under the action of gravity, thus achieving separation and impurity removal. The space between the support groove 24 and the support frame 25 is sealed by the memory foam 26 to reduce the entry of aggregate.

[0032] The rotary drive mechanism includes a gear reducer 31, a first-speed adjustable motor 32, a driving bevel gear 33, a support base 34, a transmission shaft 35, a worm gear 36, a driven bevel gear 37, a worm wheel 38, and a baffle plate 67. Two gear reducers 31 are fixed to the right side of the housing 1. The transmission shaft 35 of the gear reducer 31 is arranged in a front-to-back direction, with the input shaft horizontally aligned to the right. A first-speed adjustable motor 32 is fixed to the right side of the gear reducer 31, and the shaft of the first-speed adjustable motor 32 is coaxially fixed to the input shaft. A driving bevel gear 33 is coaxially fixed to both the front and rear ends of the transmission shaft 35 of the gear reducer 31. Two sets of support bases 34 are fixed from top to bottom in the housing 1. Multiple horizontally corresponding support bases 34 form a group. The two sets of support bases 34 are rotatably connected to two transmission shafts 35. Each transmission shaft 35 is axially slidably connected to a worm gear 36, and each is coaxially fixed with a... Driven bevel gear 37, driven bevel gear 33 meshes with driven bevel gear 37, each hollow shaft 22 is coaxially fixed with worm gear 38, worm gear 38 meshes with worm 36, first speed regulating motor 32 is electrically connected to controller 13, when the first speed regulating motor 32 rotates, it is decelerated by gear reducer 31. The meshing of driven bevel gear 33 and driven bevel gear 37 can make the two transmission shafts 35 of a set of support seats 34 rotate simultaneously. When the two transmission shafts 35 of a set of support seats 34 are indirectly driven by the first speed regulating motor 32 and rotate simultaneously, the meshing of worm 36 and worm gear 38 can make the hollow shafts 22 of the left and right parts of the support mechanism rotate at the same speed but in opposite directions. Each sliding seat 21 is fixed with a baffle plate 67, each baffle plate 67 is located in the housing 1 and blocks the guide groove 20.

[0033] Furthermore, the controller 13 controls the first speed-regulating motor 32 to rotate in both directions. Utilizing the reduction effect of the gear reducer 31, the meshing of the driving bevel gear 33 and the driven bevel gear 37 drives the transmission shaft 35 to rotate in both directions, which in turn drives the worm gear 36 to rotate in both directions. The meshing of the worm gear 36 and the worm wheel 38 causes the hollow shaft 22 to rotate in both directions, which in turn drives the support groove 24, the flower shaft 23, the support frame 25, and the screen plate 28 to rotate in both directions, thereby changing the shape of the screen plate assembly. When the sliding seat 21 moves left and right, the self-locking property of the worm gear 36 and the worm wheel 38 allows the worm gear 36 and the worm wheel 38 to move left and right together. This ensures both the left and right movement of the sliding seat 21 and the accurate transmission between the worm wheel 38 and the worm gear 36, preventing the worm wheel 38 from rotating unexpectedly. This ensures that the shape of the screen plate assembly is controllable and reliable.

[0034] Each of the support frames 25 has a screen plate 28 installed at both the front and rear. Each screen plate 28 has a pin 39 fixed at both the left and right ends of its middle section. The pins 39 at both ends of the screen plate 28 are coaxially arranged and are rotatably connected to the support frame 25. The screen plate 28 can be flipped back and forth under external force through the rotatable connection between the pins 39 and the support frame 25. When the screen plate 28 is flipped to be parallel to the support frame 25, it can close and seal the support frame 25. The end of the screen plate 28 near the discharge hopper 30 is threaded with a detachable limiting bolt 40. The limiting bolt 40 is inserted through the support frame 25 to limit the position of the screen plate 28 relative to the support frame 25. Each of the left and right sides of the box body 1 has two maintenance windows 41. Each maintenance window 41 is located diagonally above each support frame 25 and is equipped with an openable and closable shield.

[0035] Furthermore, open the shielding part, and then control the rotation drive mechanism to bring the part of the screen plate 28 with the threaded connection limit bolt 40 close to the maintenance window 41. Then remove the limit bolt 40 and manually rotate the screen plate 28 around the pin 39, so that the bottom end of the screen plate 28 becomes the top end. Then install the limit bolt 40, so that the bottom end of the original screen plate 28 can also directly contact the aggregate and accept wear, thereby making the wear more uniform, making fuller use, and extending the service life.

[0036] The support groove 24 can contact the top of the discharge hopper 30. The shielding component includes a guide hopper 43, fastening bolts 44, and fastening screw holes 45. Each of the maintenance windows 41 is hinged to the left and right of the guide hopper 43. The upper part of the guide hopper 43 is vertical and the bottom is inclined and protrudes into the lower part of the box 1. Fastening bolts 44 are inserted through the upper part of the guide hopper 43 on the left and right. There are two fastening screw holes 45 through the left and right parts of the box 1. The fastening bolts 44 can be threaded into the fastening screw holes 45 to close the guide hopper 43 and the maintenance window 41. After the fastening bolts 44 are disengaged from the fastening screw holes 45, the guide hopper 43 can be opened relative to the maintenance window 41 by manually moving it. The support groove 24 can contact the bottom of the guide hopper 43. The upper part of the support groove 24 in the front and rear parts of the support frame 25 converges downward towards the middle of the support frame 25.

[0037] Furthermore, by using a wrench or other tools to loosen the fastening bolt 44, the guide hopper 43 can be manually pushed to open the maintenance window 41, thus facilitating manual operation of the limit bolt 40 and the screen plate 28. After the operation is completed, the guide hopper 43 can be manually reset, and then the threaded connection between the fastening bolt 44 and the fastening screw hole 45 can be restored to restore the sealing of the maintenance window 41. The inclined protruding part at the bottom of the guide hopper 43 can guide the falling aggregate, so that the aggregate flows to the screen plate group for screening, thereby ensuring the screening effect. The support groove 24 can also guide the falling aggregate from the front and back to the middle, so that the aggregate flows to the screen plate group for screening.

[0038] The vibration mechanism comprises two components, each used to drive the two sets of support shafts 23 to vibrate back and forth. Each vibration mechanism includes a mounting base 46, a second-generation speed-regulating motor 47, a support plate 48, a guide seat 49, a slider 50, an adjusting bolt 51, a drag shaft 52, and a drag frame 53. Two mounting bases 46 are fixed to the front end of the housing 1. A vertical second-generation speed-regulating motor 47 is fixed to each mounting base 46. The rotating shafts of the two second-generation speed-regulating motors 47 are coaxially fixed to the support plates 48. The two support plates 48 are rotatably connected to the mounting bases 46, and radial guide seats 49 are fixed to their tops. Slider 50s are horizontally slidably connected to each guide seat 49, and adjustable bolts 51 are rotatably connected to each guide seat 52. Adjusting bolt 51 is threadedly connected to slider 50 and rotatably connected to guide seat 49. Vertical drag shafts 52 are fixed to the top of each slider 50. When the adjusting bolt 51 rotates forward and backward, the slider 50 can slide horizontally back and forth along guide seat 49, thereby changing the axial distance of drag shaft 52 relative to support plate 48. Horizontal drag frames 53 are rotatably connected to each of the two drag shafts 52. The left and right parts of the drag frame 53 are slidably connected to the flower shaft 23. When the support plate 48 rotates and the drag shaft 52 is not coaxial with the support plate 48, the flower shaft 23 can be driven to move back and forth through the drag frame 53. The two second speed-regulating motors 47 are electrically connected to controller 13.

[0039] Furthermore, by manually rotating the adjusting bolt 51 using a wrench or other tools, the slider 50 can be moved along the guide seat 49, thereby adjusting the distance between the drag shaft 52 and the virtual axis of the support plate 48. The size of this distance determines the vibration amplitude of the subsequent screen plate 28. That is, by controlling the rotation of the second speed-regulating motor 47, the support plate 48, guide seat 49, and slider 50 can be used to drive the drag shaft 52 to move circumferentially, thereby using the drag frame 53 to drive the flower shaft 23 to move back and forth, which in turn drives the support frame 25 and the screen plate 28 to vibrate back and forth, thus achieving vibratory screening. The rotation speed of the second speed-regulating motor 47 determines the vibration frequency. For example, using the screening method mentioned in the patent document in the background art, a large amplitude and low frequency vibration can be used for screening the screen plate 28 at the upper part of the box 1, while a small amplitude and high frequency vibration can be used for screening the screen plate 28 at the lower part of the box 1, thus achieving a better screening effect for aggregates of different particle sizes.

[0040] The box 1 has an upper opening 54 and a lower opening 55 extending from top to bottom. Multiple support beams 56 are fixed inside the box 1 along the front-to-back direction. The top of each support beam 56 is flush with the bottom of the upper opening 54. The upper opening 54 and lower opening 55 are each located below two support mechanisms. Collection grooves 57 are inserted into the upper opening 54 and lower opening 55, respectively, and can be disengaged forward. The bottom of the collection groove 57 in the upper opening 54 is flush with the top of the support beam 56. The bottom end of the collection groove 57 in the lower opening 55 is in close contact with the bottom end of the inner wall of the box 1. The front part of the box 1 is hinged with a cover plate 58 and a baffle 59 is rotatably connected to it. The cover plate 58 can completely cover the upper opening 54. The baffle 59 is located in front of and above the cover plate 58. When the baffle 59 hangs down naturally, its rear end can abut against the front end of the cover plate 58. When the baffle 59 is pushed upward by hand, it can release the abutment against the front end of the cover plate 58.

[0041] Furthermore, depending on the usage requirements, the aggregate screened by the upper vibrating screen mechanism can be directly used. In this case, the cover plate 58 can be opened and the collection trough 57 can be inserted into the upper opening 54. If it is not used and needs to be screened again by the lower vibrating screen mechanism, the collection trough 57 can be pulled out from the upper opening 54. Then, the cover plate 58 can be manually flipped upward to cover the upper opening 54. During this process, the baffle 59 can be manually pushed upward to avoid interfering with the closing of the cover plate 58. After the closing is completed, the pushing of the baffle 59 can be stopped, allowing the baffle 59 to fall naturally, thereby achieving resistance to the cover plate 58 to maintain the closing of the cover plate 58 and the upper opening 54 and prevent the aggregate from accidentally leaking out.

[0042] Two sets of horizontal support columns 60 are fixed to the front end of the housing 1. The support columns 60 are arranged horizontally front to back, and the left and right corresponding support columns 60 form a set. The two sets of support columns 60 are slidably connected to sliding frames 61. The two sliding frames 61 are fixed with racks 62 in the front-back direction. The two sliding frames 61 and the two sets of support columns 60 are respectively fixed with a second tension spring 63. The sliding frames 61 have a tendency to move backward under the elastic tension of the second tension spring 63. The outer circumferential walls of the two support disks 48 are respectively coaxially fixed with incomplete teeth. Two incomplete gear rings 64 intermittently mesh with two racks 62 respectively. The sliding frame 61 has a pendulum 65 hinged to the left and right sides, and the virtual hinge axis of the pendulum 65 is set horizontally. The front ends of the two collection grooves 57 are each fixed with a transmission arm 66. When the sliding frame 61 moves back and forth, it can drive the pendulum 65 to swing back and forth. When the pendulum 65 swings backward, it can strike the transmission arm 66. When the pendulum 65 is manually pushed upward, it can move away from the transmission arm 66 so as not to interfere with the back and forth movement of the collection groove 57.

[0043] Furthermore, when the collection trough 57 is inserted into the upper opening 54 or the lower opening 55, the counterclockwise rotation of the support plate 48 (viewed from a top angle) allows the sliding frame 61 to move forward intermittently through the intermittent meshing of the incomplete gear ring 64 and the rack 62. When the incomplete gear ring 64 disengages from the rack 62, the sliding frame 61 slides backward under the elastic tension of the second tension spring 63, thus realizing the back-and-forth sliding of the sliding frame 61. Subsequently, under the action of inertia, the pendulum 65 moves back and forth and swings back and forth. When the pendulum 65 swings backward, it can strike the transmission arm 66, causing the collection trough 57 to vibrate. This facilitates the uniform distribution and compaction of the aggregate in the collection trough 57, reducing the waste of space and making the subsequent transportation and screening of aggregate more convenient.

[0044] The above description represents a preferred embodiment of the present invention. For those skilled in the art, any changes, modifications, substitutions, and variations made to the implementation methods without departing from the principles and spirit of the present invention, based on the teachings of the present invention, still fall within the protection scope of the present invention.

Claims

1. A vibrating screen for concrete processing, comprising a housing (1), a feeding mechanism, an upper vibrating screening mechanism, a lower vibrating screening mechanism, a vibrating mechanism, a support mechanism, a screen plate assembly, and a controller (13), characterized in that: The housing (1) is equipped with a feeding mechanism, an upper vibrating screening mechanism, and a lower vibrating screening mechanism from top to bottom. The upper and lower vibrating screening mechanisms each include a vibrating mechanism, a supporting mechanism, and a screen plate assembly. The screen plate assembly slides back and forth relative to the housing (1) and is supported by the supporting mechanism. The vibrating mechanism can drive the supporting mechanism to vibrate the screen plate assembly back and forth to achieve screening. The screen holes of the screen plate assembly are arranged vertically and can be driven by the supporting mechanism to deform vertically into an upward convex shape and a downward concave shape. When the screen plate assembly is upward convex or downward concave, it extends in the front-back direction. The screening accuracy of the screen plate assembly of the lower vibrating screening mechanism is greater than that of the screen plate assembly of the upper vibrating screening mechanism. The feeding mechanism includes a guide housing (8), a feeding channel (9), a feeding cylinder (10), a lifting mechanism, and a discharge port (12). The guide housing (8) is installed in the upper part of the housing (1). The guide housing (8) is provided with a feeding channel (9) on both the left and right sides. The two feeding channels (9) are vertical at the bottom and converge upwards at the top. The guide housing (8) is slidably connected to a vertical feeding cylinder (10). The upper part of the feeding cylinder (10) converges downwards and the bottom is vertical. The feeding cylinder (10) is slidably connected to the upper part of the box body (1). The guide housing (8) and the feeding cylinder (10) are jointly equipped with a lifting mechanism. The lifting mechanism is used to drive the feeding cylinder (10) relative to the guide housing (8). The material feeding cylinder (10) moves downwards, and the bottom of the cylinder (10) has outlets (12) extending through it on the left and right. The outlets (12) on the left and right sides of the material feeding cylinder (10) can be connected to the two feeding channels (9) respectively, and can be located below the two feeding channels (9) and connected to the inner cavity of the box (1). The vibration mechanism is electrically driven, and the box (1) is fixed with a controller (13). The vibration mechanism is electrically connected to the controller (13), and the controller (13) is connected to an external power source.

2. The vibrating screen for concrete processing according to claim 1, characterized in that: The bottom of the feed cylinder (10) is fixed with a guide protrusion (14). The guide protrusion (14) is a ridge shape with an acute angle extending from front to back. The lifting mechanism is an electric push rod (15). The front and rear parts of the guide housing (8) are each fixed with a vertical electric push rod (15). The push rods of the two electric push rods (15) are respectively fixed to the front and rear parts of the feed cylinder (10) and are respectively electrically connected to the controller (13) through the surplus cable. When the electric push rod (15) extends and retracts, it can drive the feed cylinder (10) to move up and down relative to the guide housing (8).

3. A vibrating screen for concrete processing according to claim 2, characterized in that: The bottom of the guide housing (8) is fixed with a support shaft (16) along the front-back direction. The support shaft (16) is coaxially rotatably connected with a support roller (17). The front end of the housing (1) is fixed with a reduction motor (18) along the front-back direction. The rotating shaft of the reduction motor (18) is rotatably connected with the housing (1), and its rotating shaft is coaxially fixed with a cam (19). The cam (19) rolls and rubs against the bottom of the support roller (17). The reduction motor (18) is electrically connected to the controller (13).

4. A vibrating screen for concrete processing according to claim 3, characterized in that: The support mechanism includes guide grooves (20), sliding seats (21), hollow shafts (22), flower shafts (23), support grooves (24), support frames (25), memory foam (26), tension springs (27), sieve plates (28), rotary drive mechanisms, and discharge hoppers (30). The box body (1) has two sets of guide grooves (20) running through its left and right sides, front and back. The two corresponding guide grooves (20) on the front and back sides of the box body (1) form a group. Each group of guide grooves (20) is slidably connected to sliding seats (21) on the left and right sides. Each group of guide grooves (20) corresponds to a set of sliding seats (21). The seats (21) are rotatably connected to hollow shafts (22) in the front and back directions. The hollow shafts (22) of each set of sliding seats (21) are axially slidably connected to a flower shaft (23). The adjacent ends of each hollow shaft (22) are respectively radially fixed with support grooves (24). The middle part of each flower shaft (23) is respectively radially fixed with a support frame (25). The support frame (25) is slidably connected to the support grooves (24) on the front and back sides. The left and right sides of the inner wall of the support groove (24) are respectively fixed with memory foam (26). The memory foam (26) always fills the gap between the support groove (24) and the support frame (25). The sliding seat (21) is always in contact with the support groove (24) and the support frame (25). A tension spring (27) is fixed together with the middle part of the box (1). Under the elastic tension of the tension spring (27), each sliding seat (21) tends to move closer to each other. The sieve plate assembly includes multiple sieve plates (28) installed in the support frame (25). The vibration mechanism is used to drive the flower shaft (23) to vibrate back and forth, thereby driving the support frame (25) and the sieve plate assembly to vibrate back and forth. The box (1) is also equipped with two rotary drive mechanisms. Each rotary drive mechanism is used to drive the left side of each support mechanism. The hollow shafts (22) corresponding to each other rotate and brake to change the included angle of the screen plate (28). The left and right ends of the support groove (24) are flush with the left and right ends of the support frame (25). The support groove (24) and the support frame (25) of the left and right parts of the support mechanism can contact each other under the indirect pull of the No. 1 tension spring (27) and rotate under the indirect drive of the rotation drive mechanism to realize the upward convexity and downward concavity of the screen plate group. The left and right parts of the box (1) are each provided with two discharge buckets (30) that run through the left and right and tilt outward and downward. The two discharge buckets (30) of the left and right parts of the box (1) are located diagonally below the support frame (25).

5. A vibrating screen for concrete processing according to claim 4, characterized in that: The rotary drive mechanism includes a gear reducer (31), a first-speed adjustable motor (32), a driving bevel gear (33), a support base (34), a transmission shaft (35), a worm gear (36), a driven bevel gear (37), a worm wheel (38), and a baffle plate (67). Two gear reducers (31) are fixed on the right side of the housing (1). The transmission shaft (35) of the gear reducer (31) is arranged in a front-to-back direction, and the input shaft is arranged horizontally to the right. A first-speed adjustable motor is fixed on the right side of the gear reducer (31). (32) The rotating shaft of the first speed-regulating motor (32) is coaxially fixed with the input shaft. The transmission shaft (35) of the gear reducer (31) is coaxially fixed with a driving bevel gear (33) at both the front and rear. The housing (1) has two sets of support seats (34) fixed from top to bottom. Multiple horizontally corresponding support seats (34) form a group. The two sets of support seats (34) are rotatably connected to two transmission shafts (35). Each transmission shaft (35) is axially slidably connected with a worm gear (36) and is coaxially fixed with a worm gear (36). Driven bevel gear (37), the driving bevel gear (33) meshes with the driven bevel gear (37), each hollow shaft (22) is coaxially fixed with a worm gear (38), the worm gear (38) meshes with the worm (36), the first speed-regulating motor (32) is electrically connected to the controller (13), when the first speed-regulating motor (32) rotates, it is decelerated by the gear reducer (31). The meshing of the driving bevel gear (33) and the driven bevel gear (37) enables a set of support seats (34) to be located The two drive shafts (35) rotate simultaneously. When the two drive shafts (35) of the support base (34) are indirectly driven by the first speed-regulating motor (32) and rotate simultaneously, the meshing of the worm (36) and the worm wheel (38) enables the hollow shafts (22) of the left and right parts of the support mechanism to rotate at the same speed but in opposite directions. Each sliding seat (21) is fixed with a baffle plate (67). Each baffle plate (67) is located in the box (1) and blocks the guide groove (20).

6. A vibrating screen for concrete processing according to claim 5, characterized in that: Each of the support frames (25) has a sieve plate (28) installed at both the front and rear. A pin (39) is fixed at each of the left and right ends of the middle of the sieve plate (28). The pins (39) at the left and right ends of the sieve plate (28) are coaxially arranged. The pins (39) are rotatably connected to the support frame (25). The sieve plate (28) can be flipped back and forth under external force through the rotatable connection between the pins (39) and the support frame (25). When the sieve plate (28) is flipped to be parallel to the support frame (25), it can support the support frame (25). The screen plate (28) is closed and sealed. The end of the screen plate (28) near the discharge hopper (30) is threaded with a detachable limiting bolt (40). The limiting bolt (40) is inserted through the support frame (25) to limit the position of the screen plate (28) relative to the support frame (25). There are two maintenance windows (41) on each of the left and right sides of the box body (1). Each maintenance window (41) is located diagonally above each support frame (25). The maintenance window (41) is equipped with a cover that can be opened and closed.

7. A vibrating screen for concrete processing according to claim 6, characterized in that: The support groove (24) can contact the top of the discharge hopper (30). The shielding component includes a guide hopper (43), fastening bolts (44), and fastening screw holes (45). Each maintenance window (41) is hinged with a guide hopper (43) on the left and right. The upper part of the guide hopper (43) is vertical and the bottom is inclined and protrudes into the box (1). Fastening bolts (44) are inserted through the upper part of the guide hopper (43) on the left and right. There are two fastening screw holes (45) through the left and right sides of the box (1). 5) The fastening bolt (44) can be threadedly connected to the fastening screw hole (45) to realize the closure of the guide hopper (43) and the maintenance window (41). After the fastening bolt (44) is disengaged from the fastening screw hole (45), the guide hopper (43) can be opened relative to the maintenance window (41) by manually moving it. The support groove (24) can touch the bottom of the guide hopper (43). The upper part of the support groove (24) of the front and rear parts of the support frame (25) is in a downward convergence shape towards the middle of the support frame (25).

8. A vibrating screen for concrete processing according to claim 7, characterized in that: The vibration mechanism consists of two components, each used to drive the two sets of support shafts (23) to vibrate back and forth. Each vibration mechanism includes a mounting base (46), a second-speed adjustable motor (47), a support plate (48), a guide seat (49), a slider (50), an adjusting bolt (51), a drive shaft (52), and a drive frame (53). Two mounting bases (46) are fixed at the front end of the housing (1). The two mounting bases (46) are each fixed with a vertical second-speed adjustable motor (47). The shafts of the two second-speed adjustable motors (47) are coaxially fixed with support plates (48). The two support plates (48) are rotatably connected to the mounting bases (46), and radial guide seats (49) are fixed at their top ends. The two guide seats (49) are horizontally slidably connected with sliders (50), and are rotatably connected with adjusting bolts. The adjusting bolt (51) is threadedly connected to the slider (50) and rotatably connected to the guide seat (49). The tops of the two sliders (50) are respectively fixed with vertical drag shafts (52). When the adjusting bolt (51) rotates forward and backward, the slider (50) can slide horizontally back and forth along the guide seat (49) to change the axial distance of the drag shaft (52) relative to the support plate (48). The two drag shafts (52) are respectively rotatably connected to horizontal drag frames (53). The left and right parts of the drag frame (53) are respectively slidably connected to the flower shaft (23). When the support plate (48) rotates and the drag shaft (52) is not coaxial with the support plate (48), the flower shaft (23) can be driven to move back and forth through the drag frame (53). The two second speed-regulating motors (47) are respectively electrically connected to the controller (13).

9. A vibrating screen for concrete processing according to claim 8, characterized in that: The box (1) has an upper opening (54) and a lower opening (55) running through it from top to bottom. Multiple support beams (56) are fixed inside the box (1) along the front-to-back direction. The top of each support beam (56) is flush with the bottom of the upper opening (54). The upper opening (54) and lower opening (55) are each located below two support mechanisms. Collection slots (57) are inserted into the upper opening (54) and lower opening (55) respectively, and can be disengaged forward. The bottom of the collection slot (57) in the upper opening (54) is flush with the top of the support beam (56). The bottom end of the collection groove (57) in the lower opening (55) is in close contact with the bottom end of the inner wall of the box (1). The front part of the box (1) is hinged with a cover plate (58) and a baffle (59) is connected to it by rotation. The cover plate (58) can completely cover the upper opening (54). The baffle (59) is located in front of and above the cover plate (58). When the baffle (59) hangs down naturally, its rear end can abut against the front end of the cover plate (58). When the baffle (59) is pushed upward by hand, it can release the abutment against the front end of the cover plate (58).

10. A vibrating screen for concrete processing according to claim 9, characterized in that: Two sets of horizontal support columns (60) are fixed at the front end of the box (1). The support columns (60) are arranged horizontally front to back. The support columns (60) that correspond to each other on the left and right constitute a set. The two sets of support columns (60) are slidably connected to sliding frames (61) in front to back. The two sliding frames (61) are fixed with racks (62) in the front-back direction. The two sliding frames (61) and the two sets of support columns (60) are respectively fixed with a second tension spring (63). The sliding frame (61) has a tendency to move backward under the elastic tension of the second tension spring (63). The outer circumferential walls of the two support discs (48) are respectively fixed with incomplete gear rings on the same axis. (64) The two incomplete gear rings (64) are intermittently meshed with the two racks (62). The sliding frame (61) has a pendulum (65) hinged to the left and right sides. The virtual hinge axis of the pendulum (65) is set horizontally to the left and right. The two collection grooves (57) have a transmission arm (66) fixed to the left and right sides at the front end. When the sliding frame (61) moves back and forth, it can drive the pendulum (65) to swing back and forth. When the pendulum (65) swings backward, it can strike the transmission arm (66). When the pendulum (65) is manually pushed upward, it can move away from the transmission arm (66) so as not to interfere with the back and forth movement of the collection groove (57).

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