Road footstone screening system and method

Abstract

The invention provides a highway footstone screening system and method, and relates to the technical field of highway footstone screening. The at least four material receiving plates are sequentially connected side by side and are used for receiving the screened footstones with various particle sizes; and the two side frames are respectively distributed at the front end and the rear end of the material receiving discs which are arranged side by side. According to the driving system, a synchronous motor driving shaft and a worm and gear speed reduction transmission chain are adopted, torque is accurately transmitted to a swing guiding body, and through cooperation of an annular equilateral triangle-shaped annular groove and a hanging pin, rotary motion is converted into linear reciprocating motion of a one-way poke rod. According to the structure, reliability of power transmission is achieved, constant downward pressure is kept in the material pushing stage through the design of the tension spring at the bottom of the shifting rod, and it is guaranteed that stones are effectively pushed on the surface of the screen; and in the returning stage, the screen is automatically lifted and separated, and the layering damage problem caused by reciprocating disturbance of traditional screening equipment is thoroughly avoided.

Description

Technical Field

[0001] The present invention relates to the technical field of highway foundation stone screening, and in particular to a highway foundation stone screening system and method. Background Art

[0002] In the process of screening highway foundation stones, traditional equipment has long had technical bottlenecks such as low power transmission efficiency, large disturbance in the screening process, serious dust pollution and insufficient classification accuracy. Specifically, traditional screening devices mostly use a single vibration or rotation mode. Due to the lack of a reliable deceleration and torque distribution mechanism, their power transmission system often leads to poor motion stability and uneven force on the screen, which not only reduces the screening efficiency, but also destroys the structure of the layered stone due to the mechanical disturbance caused by the reciprocating motion, causing the dual problems of fine material mixing and coarse material residue. At the same time, traditional dust treatment methods rely on independent energy consumption bag dust removal or water mist spray systems, which not only increase operating costs, but also are difficult to adapt to the needs of confined space operations, resulting in widespread dust overflow, serious environmental pollution and endangering the health of operators. In addition, multi-stage screening equipment generally has design defects in the coarse and fine material discharge channel and lacks a physical isolation mechanism, which makes it easy for stones of different particle sizes to produce secondary mixing during the discharge process, directly affecting the classification accuracy and subsequent construction application effects. Summary of the invention

[0003] The present invention relates to a highway foundation stone screening system and method, the overall structure of which adopts a modular design. A synchronous motor drives multiple groups of swing guide bodies to realize four-level screening linkage, and cooperates with a dustproof net and a suction fan to form a fully enclosed working space, thereby improving the screening efficiency. Moreover, through the deep integration of mechanical motion and fluid mechanics, it solves the systematic problems of traditional screening systems such as dust overflow, high energy consumption, and insufficient grading accuracy.

[0004] The present invention provides a highway foundation stone screening system and method, which specifically include: a supporting chassis, used to support a receiving tray; There are at least four receiving trays connected in parallel and in sequence, which are used to receive the cornerstones of various particle sizes after screening; There are two side frames, which are respectively distributed at the front and rear ends of the receiving tray in a side-by-side state; A dust removal water tank is fixedly mounted on the outer side wall of the side frame; A driving frame, mounted on the upper end of the side frame, for driving the swing guide body; The swing guide body is installed on the side frame inside the driving frame, and each side frame is provided with at least four swing guide bodies corresponding to the receiving tray; The screening tray is located between the upper ends of the two side frames, and the receiving tray is located below. One end of the screening tray is closed, and the other end is open. Screens with gradually increasing apertures are installed in the bottom plate of the screening tray from the closed end to the open end corresponding to the receiving tray. The one-way toggle rod has a "凵"-shaped structure. A one-way toggle rod is provided above each sieve. The two ends of the one-way toggle rod respectively correspond to the opposite swing guides on the two side frames. A first gear is rotatably installed between two adjacent swing guides on the same side frame. The first gear is used to transmit the power between the drive frame and the swing guide. During stone screening, the one-way toggle rod moves along the sieve from the closed end to the open end of the screening tray, then lifts upward and returns to fall, and so on in a cycle. At the same time, the screening tray moves horizontally back and forth from the closed end to the open end, and the dust generated by screening is conveyed to the dust removal water tank for absorption and treatment.

[0005] Optionally, the inner cavity of the material receiving tray is a material guiding chamber inclined downward towards one end. A discharge pipe is provided downward at the lower part of the material guiding chamber. An ash discharging tray is provided outside the material receiving tray at the open end of the screening tray. The ash discharging tray has the same structure as the material receiving tray but in the opposite direction, and is used to receive the coarse materials in the screening tray.

[0006] Optionally, the upper end of the dust removal water tank is an open end, and the dust removal water tank is as long as the side frame.

[0007] Optionally, a drive shaft is rotatably installed in the drive frame. A synchronous motor is fixedly installed at one end of the drive frame and is rotationally connected to the drive shaft. A worm is provided at the position of the drive shaft corresponding to each first gear. A worm gear is provided at the end of the rotating shaft of the first gear and meshes with the worm on the drive shaft. A second gear is fixedly installed at the outer end of the rotating shaft of the swing guide. The first gear meshes with two adjacent second gears.

[0008] Optionally, a fork is fixedly connected to the inner end of the rotating shaft of the swing guide. An equilateral triangle-shaped ring groove is annularly opened at the circular motion track of the fork. A straight groove is horizontally opened on the swing guide below the ring groove.

[0009] Optionally, hanging pins are respectively fixedly provided at the two ends of the one-way toggle rod. The hanging pins pass through the fork and are slidably inserted into the ring groove. The bottom of the one-way toggle rod is vertically and slidably provided with toggle rods at uniform intervals. A tension spring is provided at the upper end of the toggle rod, and the lower end of the tension spring is fixedly connected to the one-way toggle rod to provide a downward pulling force for the toggle rod at all times. When the fork rotates, it drives the one-way toggle rod to reciprocate along the track of the ring groove. When the one-way toggle rod moves from the closed end to the open end of the screening tray, the toggle rod on the one-way toggle rod approaches the sieve and carries the un-screened stones to move towards the open end. When the one-way toggle rod moves from the open end to the closed end of the screening tray, the one-way toggle rod first moves upward and then downward, and the toggle rod does not contact the stones on the sieve.

[0010] Optionally, a hanger is provided at a position on the screening tray corresponding to the swing guide body, and the hanger is provided with a slot that is vertically slidably engaged with the lever to always keep the lever in a vertical state. A horizontal block is fixedly provided at one end of the hanger close to the swing guide body, and the block is slidably engaged in the straight groove. When the shift fork drives the one-way shift rod to move back and forth, it synchronously drives the screening tray to move back and forth horizontally.

[0011] Optionally, an upwardly convex arc-shaped retention slope is provided between adjacent screens on the screening tray, and the retention slope is used to retain stones that are not fully screened. A feed guide for assisting the entry of stones is also provided at the closed end of the screening tray.

[0012] Optionally, a dustproof net is also provided above the screening tray, and the dustproof net is supported between the upper ends of the two side frames by support rods. A suction fan is also provided on the inner side of the first gear, and the rotating shaft of the suction fan is fixedly connected to the rotating shaft of the first gear. The air intake port of the suction fan faces above the screening tray, and the air outlet of the suction fan is connected to the conveying pipe to the dust removal water tank on the corresponding side. The rotation of the first gear synchronously drives the suction fan to absorb the dust generated by the screening and convey it to the dust removal water tank for dust reduction treatment.

[0013] A method for screening highway foundation stones comprises the following steps: First, add the stone from the feed guide of the screening tray, and add water to the dust removal water tank until it submerges the conveying pipe; Second, the synchronous motor in the driving frame is started, and the driving shaft meshes with the worm wheel of the first gear through the worm, transmitting torque to two adjacent swing guide bodies to form a linkage rotation mechanism, so that the fork of the swing guide body enters a circular motion state; Third, the shift fork drives the one-way shifting rod to move back and forth along the length direction of the screening tray through the cooperation of the ring groove and the hanging pin. When moving from the closed end to the open end, the shifting rod keeps contacting the screen downward under the action of the tension spring, pushing the unscreened stones to move toward the open end. When returning from the open end, the shifting rod moves up with the one-way shifting rod to detach from the screen, avoiding reverse interference with the layered stones. Fourth, the swing guide body drives the hanging part of the screening tray to move back and forth horizontally through the sliding cooperation between the straight groove and the card block, and the hanging part of the screening tray is vertically connected with the lever to ensure that the one-way lever can always be in a vertical state; Fifth, the stone enters the closed end of the screening tray through the feed guide body, and is screened in four stages through the screens with gradually increasing apertures. The stone that meets the aperture falls into the guide cabin of the corresponding receiving tray, and the unscreened coarse material is temporarily stored through the retention slope and then continues to move to the open end, and finally enters the slag discharge tray. The periodic unidirectional push of the lever and the reciprocating horizontal movement of the screening tray form a rolling-layering-pushing cycle of the stone on the screen, combined with the interception effect of the retention slope, to improve the thoroughness and efficiency of multi-stage screening; Sixth, the first gear synchronously drives the suction fan to form a negative pressure area above the screening tray. The dust-laden airflow enters the suction fan through the dust-proof net and is discharged into the dust removal water tank through the conveying pipe for absorption and dust reduction treatment.

[0014] The present invention provides a highway foundation stone screening system and method, which have the following beneficial effects: The drive system uses a synchronous motor drive shaft and a worm gear reduction transmission chain to accurately transmit torque to the swing guide body, and through the cooperation of the annular equilateral triangle ring groove and the hanging pin, the rotational motion is converted into the linear reciprocating motion of the one-way toggle lever. This structure not only realizes the reliability of power transmission, but also maintains a constant downward pressure during the pushing stage through the tension spring design at the bottom of the toggle lever to ensure the effective movement of the stone on the screen surface; and automatically lifts off the screen during the return stage, completely avoiding the stratification damage problem caused by reciprocating disturbances in traditional screening equipment.

[0015] The innovative compound motion mechanism of the screening tray integrates horizontal vibration and unidirectional push: the pendant converts the rotational motion of the swing guide into reciprocating vibration of the tray through the sliding fit of the block and the straight groove, which forms a synergistic effect with the unidirectional push of the lever. This motion mode causes the stone to produce a unique "rolling-layering-pushing" cycle on the surface of the screen with increasing apertures. Fine materials are quickly screened to the corresponding receiving tray, and coarse materials are intercepted by the retention slope to extend the screening path. The special design of the arc retention slope effectively solves the problems of premature loss of fine materials and incomplete screening of coarse materials in traditional multi-stage screening.

[0016] The dust handling system realizes energy coupling and fluid mechanics optimization: the first gear drives the suction fan while transmitting torque, forming a negative pressure airflow zone. The dust-laden air is coarsely filtered through the dust-proof net and then enters the dust removal water tank through the conveying pipe. The opening design at the top of the water tank allows the airflow to fully contact the water surface. The dust particles are adhered and settled by the water mist under the action of turbulence. Compared with traditional bag dust removal or water mist spraying systems, the dust handling efficiency is improved without additional energy consumption. The inclined guide cabin of the receiving tray and the reverse slag tray form a gravity grading channel, which completely avoids the mixing of coarse and fine materials and realizes automatic discharge with physical isolation. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solution of the embodiment of the present invention, the drawings of the embodiment are briefly introduced below.

[0018] The drawings described below are only related to some embodiments of the present invention, but are not intended to limit the present invention.

[0019] In the attached picture: Figure 1 A schematic diagram of the first axial view of the present invention is shown; Figure 2 A second axial structural schematic diagram of the present invention is shown; Figure 3 It shows a schematic diagram of the axial structure of the dust screen of the present invention in a removed state; Figure 4 It shows a schematic diagram of the axial structure of the screening tray of the present invention in an upwardly moved and separated state; Figure 5 It shows a schematic diagram of the axial structure of the screening tray of the present invention in a removed state; Figure 6 The present invention shows Figure 5 A is a schematic diagram of the structure of the enlarged part; Figure 7 It shows a schematic diagram of the axial structure of the suction fan and the second gear part of the present invention; Figure 8 A partial axial structural schematic diagram of the screening tray of the present invention is shown.

[0020] Reference numerals list 1. Support chassis; 2. receiving tray; 201. material guide cabin; 202. material discharge pipe; 3. Side frame; 4. Dust removal water tank; 5. driving frame; 501. synchronous motor; 502. driving shaft; 5021. worm; 6. swing guide body; 601. second gear; 602. annular groove; 603. straight groove; 604. shift fork; 7. One-way toggle lever; 701. Hook pin; 702. Toggle lever; 7021. Tension spring; 8. Screening tray; 801. Hanging piece; 8011. Block; 802. Screen; 803. Retention slope; 804. Feed guide; 9. Dust-proof net; 10. Slag tray; 11. first gear; 1101. worm gear; 1102. suction fan; 1103. conveying pipe. DETAILED DESCRIPTION

[0021] In order to make the purpose, technical solution and advantages of the embodiment of the present invention clearer, the technical solution of the embodiment of the present invention will be clearly and completely described below in conjunction with the accompanying drawings of the embodiment of the present invention. Obviously, the described embodiment is a part of the embodiment of the present invention, not all of the embodiments. Based on the described embodiment of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0022] Example 1: Please refer to Figures 1 to 8 : The present invention proposes a highway foundation stone screening system and method, comprising: a supporting chassis 1, used to support a receiving tray 2; There are at least four receiving trays 2 arranged side by side in sequence, which are used to receive foundation stones of various particle sizes after screening; There are two side frames 3, which are respectively distributed at the front and rear ends of the receiving trays 2 in a side-by-side state; The dust removal water tank 4 is fixedly hung on the outer side wall of the side frame 3; The driving frame 5 is installed at the upper end of the side frame 3 and is used to drive the swinging guide body 6; The swinging guide body 6 is installed on the side frame 3 inside the driving frame 5. There are at least four swinging guide bodies 6 on each side frame 3 corresponding to the receiving trays 2; The screening tray 8 is located between the upper ends of the two side frames 3. The receiving trays 2 are below it. One end of the screening tray 8 is a closed end, and the other end is an open end. In the bottom plate of the screening tray 8, screens 802 with gradually increasing apertures are sequentially installed from the closed end to the open end corresponding to the receiving trays 2; The one-way拨动 rod 7 is in a "U" shape. There is one one-way拨动 rod 7 above each screen 802. The two ends of the one-way拨动 rod 7 respectively correspond to the opposite swinging guide bodies 6 on the two side frames 3; The first gears 11 are respectively rotatably installed between two adjacent swinging guide bodies 6 on the same side frame 3. The first gears 11 are used to transmit the power between the driving frame 5 and the swinging guide bodies 6. When screening stones, the one-way拨动 rod 7 moves along the screen 802 from the closed end to the open end of the screening tray 8, then lifts upward and returns to fall, and so on in a cycle. At the same time, the screening tray 8 moves horizontally back and forth from the closed end to the open end, and the dust generated by screening is conveyed to the dust removal water tank 4 for absorption and treatment.

[0023] Among them, the inner cavity of the receiving tray 2 is a material guiding chamber 201 inclined downward to one end. A discharge pipe 202 is provided downward at the lower part of the material guiding chamber 201. An out slag tray 10 is provided outside the receiving tray 2 at the open end of the screening tray 8. The out slag tray 10 has the same structure as the receiving tray 2 but in the opposite direction, and is used to receive the coarse materials in the screening tray 8.

[0024] Among them, the upper end of the dust removal water tank 4 is an open end, and the dust removal water tank 4 is as long as the side frame 3.

[0025] Among them, a driving shaft 502 is rotatably installed in the driving frame 5. A synchronous motor 501 is fixedly installed at one end of the driving frame 5 and is rotationally connected to the driving shaft 502. A worm 5021 is provided at the position of the driving shaft 502 corresponding to each first gear 11. A worm gear 1101 is provided at the end of the rotating shaft of the first gear 11 and meshes with the worm 5021 on the driving shaft 502. A second gear 601 is fixedly installed at the outer end of the rotating shaft of the swinging guide body 6. The first gear 11 meshes with two adjacent second gears 601.

[0026] The inner end of the rotating shaft of the swing guide body 6 is fixedly connected with a shift fork 604 , an equilateral triangle-shaped annular groove 602 is formed in a circular motion trajectory of the shift fork 604 , and a straight groove 603 is formed horizontally on the swing guide body 6 below the annular groove 602 .

[0027] Among them, the two ends of the one-way toggle rod 7 are respectively fixed with hanging pins 701, which pass through the fork 604 and slide into the annular groove 602; the bottom of the one-way toggle rod 7 is evenly spaced and vertically slidably provided with a toggle rod 702, the upper end of the toggle rod 702 is provided with a tension spring 7021, the lower end of the tension spring 7021 is fixedly connected to the one-way toggle rod 7, providing a downward pulling force for the toggle rod 702, and the rotation of the fork 604 drives the one-way toggle rod 7 to move back and forth along the trajectory of the annular groove 602. When the one-way toggle rod 7 moves from the closed end to the open end of the screening tray 8, the toggle rod 702 on the one-way toggle rod 7 approaches the screen 802 and carries the unscreened stones to the open end. When the one-way toggle rod 7 moves from the open end to the closed end of the screening tray 8, the one-way toggle rod 7 first moves up and then moves down, and the toggle rod 702 does not contact the stones on the screen 802.

[0028] Among them, a hanger 801 is provided at a position on the screening tray 8 corresponding to the swing guide body 6, and a card slot is provided on the hanger 801 which is vertically slidably engaged with the lever 702 to always keep the lever 702 in a vertical state. A horizontal block 8011 is fixedly provided at one end of the hanger 801 close to the swing guide body 6, and the block 8011 is slidably engaged in the straight groove 603. When the fork 604 drives the one-way lever 7 to move back and forth, it simultaneously drives the screening tray 8 to move back and forth horizontally.

[0029] Among them, an upward convex arc-shaped retention slope 803 is provided between adjacent screens 802 on the screening tray 8, and the retention slope 803 is used to retain stones that are not fully screened. A feed guide 804 is also provided at the closed end of the screening tray 8 to assist the entry of stones.

[0030] Embodiment 2. On the basis of embodiment 1, a dustproof net 9 is further provided above the screening tray 8. The dustproof net 9 is supported between the upper ends of the two side frames 3 by support rods. A suction fan 1102 is also provided on the inner side of the first gear 11. The rotating shaft of the suction fan 1102 is fixedly connected to the rotating shaft of the first gear 11. The air intake of the suction fan 1102 faces above the screening tray 8. The air outlet of the suction fan 1102 is connected to the conveying pipe 1103 to the dust removal water tank 4 on the corresponding side. The rotation of the first gear 11 synchronously drives the suction fan 1102 to absorb the dust generated by the screening and convey it to the dust removal water tank 4 for dust reduction treatment.

[0031] The following is a further explanation and description of the structure of each part of the above content: The drive system uses a synchronous motor 501 as a power source, and the drive shaft 502 meshes with the worm wheel 1101 of the first gear 11 through the worm 5021 to form a reduction transmission chain. The torque is transmitted to the second gears 601 of the two adjacent swing guide bodies 6 through the first gear 11, driving them to rotate synchronously. In the circular motion, the shift fork 604 of the swing guide body 6 cooperates with the hanging pin 701 of the one-way toggle lever 7 through the annular equilateral triangle ring groove 602 to convert the rotational motion into the linear reciprocating motion of the one-way toggle lever 7. When the shift fork 604 moves along the inclined section of the annular groove 602, the one-way toggle rod 7 moves toward the open end of the screening tray 8, and the lever 702 at the bottom thereof keeps in contact with the screen 802 under the tension of the tension spring 7021, pushing the unscreened stones to roll toward the open end; when the shift fork 604 enters the vertical section of the annular groove 602, the one-way toggle rod 7 is lifted and then moves in the reverse direction, at which time the lever 702 is separated from the screen 802, avoiding reverse disturbance to the stratified stones.

[0032] The hanging piece 801 of the screening tray 8 forms a sliding pair with the straight groove 603 of the swing guide body 6 through the block 8011, so that the tray generates horizontal vibration during the reciprocating motion of the unidirectional toggle rod 7. This vibration forms a compound motion with the unidirectional push of the toggle rod 702: when the toggle rod 702 pushes the material toward the opening end, the vibration of the tray causes the stone to produce a rolling-layering-pushing cycle on the screen 802 with increasing apertures. Fine materials that meet the aperture quickly pass through the screen 802 and fall into the guide chamber 201 of the corresponding receiving tray 2, while the unscreened coarse materials are intercepted by the convex retention slope 803, extend the screening path, and continue to move toward the opening end, and finally discharged from the slag tray 10. The retention slope 803 between adjacent screens 802 is designed with an arc structure, which not only prevents the fine materials from being pushed to the coarse material area too early, but also provides a secondary screening buffer space for the coarse materials.

[0033] The dust handling system achieves energy coupling with the screening mechanism through gear transmission: the first gear 11 drives the suction fan 1102 to rotate while transmitting torque, forming a negative pressure area above the screening tray 8. After the dust-laden airflow is initially filtered by the dust-proof net 9, it is discharged into the dust removal water tank 4 through the conveying pipe 1103 by the suction fan 1102. The opening design at the upper end of the water tank allows the airflow to fully contact the water surface, and the dust particles are adhered and precipitated by the water mist under the action of turbulence, realizing gas-solid separation. The inclined guide cabin 201 of the receiving tray 2 and the reverse structure of the slag tray 10 form a double discharge channel, which automatically completes the graded collection of stones of different particle sizes by gravity. The position design of the discharge pipe 202 and the slag tray 10 ensures the physical isolation of coarse and fine materials.

[0034] A method for screening highway foundation stones comprises the following steps: First, add the stone from the feed guide 804 of the screening tray 8, and add water to the dust removal water tank 4 until the conveying pipe 1103 is submerged; Second, the synchronous motor 501 in the driving frame 5 is started, and the driving shaft 502 is meshed with the worm wheel 1101 of the first gear 11 through the worm 5021, and the torque is transmitted to the two adjacent swing guide bodies 6 to form a linkage rotation mechanism, so that the fork 604 of the swing guide body 6 enters a circular motion state; Third, the shift fork 604 drives the one-way shifting rod 7 to move back and forth along the length direction of the screening tray 8 through the cooperation of the annular groove 602 and the hanging pin 701. When moving from the closed end to the open end, the shifting rod 702 keeps contacting the screen 802 downward under the action of the tension spring 7021, pushing the unscreened stones to move toward the open end. When returning from the open end, the shifting rod 702 moves up with the one-way shifting rod 7 to separate from the screen 802, avoiding reverse interference with the stratified stones. Fourth, the swing guide body 6 drives the hanging piece 801 of the screening tray 8 to move back and forth horizontally through the sliding cooperation between the straight groove 603 and the block 8011, and the hanging piece 801 of the screening tray 8 is vertically engaged with the lever 702 to ensure that the one-way lever 7 can always be in a vertical state; Fifth, the stone enters the closed end of the screening tray 8 through the feed guide 804, and is screened in four stages through the screen 802 with gradually increasing apertures. The stone that meets the aperture falls into the guide cabin 201 of the corresponding receiving tray 2, and the unscreened coarse material is temporarily stored through the retention slope 803 and then continues to move to the open end, and finally enters the slag tray 10. The periodic unidirectional push of the lever 702 cooperates with the reciprocating horizontal movement of the screening tray 8 to form a rolling-layering-pushing cycle of the stone on the screen 802, combined with the interception effect of the retention slope 803, to improve the thoroughness and efficiency of multi-stage screening; Sixth, the first gear 11 synchronously drives the suction fan 1102 to form a negative pressure area above the screening tray 8. The dust-laden airflow enters the suction fan 1102 through the dustproof net 9 and is discharged into the dust removal water tank 4 through the conveying pipe 1103 for absorption and dust reduction treatment.

[0035] In this article, there are a few points to note: 1. The drawings of the embodiments of the present invention only involve structures related to the embodiments of the present invention, and other structures can refer to the general design.

[0036] 2. In the absence of conflict, the embodiments of the present invention and the features therein may be combined with each other to obtain new embodiments.

[0037] The above are only specific embodiments of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can easily think of changes or substitutions within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A highway foundation stone screening system, comprising: A support chassis (1) for supporting a material receiving tray (2); Characterized in that there are at least four material receiving trays (2) connected side by side in sequence, for receiving foundation stones of various particle sizes after screening; There are two side frames (3), which are respectively distributed at the front and rear ends of the material receiving trays (2) in a side-by-side state; A dust removal water tank (4) is fixedly hung on the outer side wall of the side frame (3); A driving frame (5) is installed at the upper end of the side frame (3) for driving a swing guiding body (6); The swing guiding body (6) is installed on the side frame (3) inside the driving frame (5), and there are at least four swing guiding bodies (6) on each side frame (3) corresponding to the material receiving tray (2); A screening tray (8) is located between the upper ends of the two side frames (3), and the material receiving tray (2) is below. One end of the screening tray (8) is a closed end, and the other end is an open end. A screen (802) with gradually increasing apertures is installed in the bottom plate of the screening tray (8) corresponding to the material receiving tray (2) in sequence from the closed end to the open end; The one-way拨动杆 (7) is in a "凵" shape structure. Above each screen (802), there is a one-way拨动杆 (7) respectively. The two ends of the one-way拨动杆 (7) respectively correspond to the swing guiding bodies (6) opposite on the two side frames (3); A first gear (11) is rotatably installed between two adjacent swing guiding bodies (6) on the same side frame (3). The first gear (11) is used to transmit the power between the driving frame (5) and the swing guiding body (6).

2. A highway foundation stone screening system according to claim 1, characterized in that: The inner cavity of the material receiving tray (2) is a material guiding cabin (201) inclined downward to one end. A discharge pipe (202) is provided downward at the lower part of the material guiding cabin (201). An out slag tray (10) is provided outside the material receiving tray (2) at the open end of the screening tray (8). The out slag tray (10) has the same structure as the material receiving tray (2) but in the opposite direction, for receiving the coarse materials in the screening tray (8).

3. A highway foundation stone screening system according to claim 1, characterized in that: The upper end of the dust removal water tank (4) is an open end, and the dust removal water tank (4) is as long as the side frame (3).

4. A highway foundation stone screening system according to claim 1, characterized in that: A driving shaft (502) is rotatably installed in the driving frame (5). A synchronous motor (501) is fixedly installed at one end of the driving frame (5) and is rotationally connected to the driving shaft (502). At the position corresponding to each first gear (11) on the driving shaft (502), there is a worm (5021). A worm wheel (1101) is provided at the end of the rotating shaft of the first gear (11) and meshes with the worm (5021) on the driving shaft (502). A second gear (601) is fixedly installed at the outer end of the rotating shaft of the swing guiding body (6). The first gear (11) meshes with two adjacent second gears (601).

5. The highway foundation stone screening system according to claim 1, characterized in that: A fork (604) is fixedly connected to the inner end of the rotating shaft of the swing guiding body (6). An equilateral triangular ring groove (602) is annularly opened at the circumferential movement track of the fork (604). A straight groove (603) is horizontally opened on the swing guiding body (6) below the ring groove (602).

6. A highway foundation stone screening system according to claim 4, characterized in that: The two ends of the one-way toggle lever (7) are respectively fixedly provided with hanging pins (701), which pass through the shift fork (604) and are slidably inserted into the annular groove (602); the bottom of the one-way toggle lever (7) is evenly spaced and vertically slidably provided with toggle levers (702), the upper end of the toggle lever (702) is provided with a tension spring (7021), the lower end of the tension spring (7021) is fixedly connected to the one-way toggle lever (7), so as to provide the toggle lever (702) with a downward pulling force all the time, and the shift fork (604) The rotation drives the one-way toggle rod (7) to reciprocate along the track of the annular groove (602). When the one-way toggle rod (7) moves from the closed end to the open end of the screening tray (8), the lever (702) on the one-way toggle rod (7) moves close to the screen (802) and carries the unscreened stones to move toward the open end. When the one-way toggle rod (7) moves from the open end to the closed end of the screening tray (8), the one-way toggle rod (7) first moves up and then moves down, and the lever (702) does not contact the stones on the screen (802).

7. A highway foundation stone screening system according to claim 6, characterized in that: A hanging piece (801) is provided at a position on the screening tray (8) corresponding to the swing guide body (6); a slot is provided on the hanging piece (801) for vertically slidingly engaging with the lever (702), so as to always keep the lever (702) in a vertical state; a horizontal block (8011) is fixedly provided at one end of the hanging piece (801) close to the swing guide body (6); the block (8011) is slidably engaged in the straight groove (603); and when the shift fork (604) drives the one-way shift lever (7) to reciprocate, the screening tray (8) is synchronously driven to reciprocate horizontally.

8. A highway foundation stone screening system according to claim 1, characterized in that: An upwardly convex arc-shaped retention slope (803) is provided between adjacent screens (802) on the screening tray (8), and the retention slope (803) is used to retain stones that have not been fully screened. A feed guide (804) for assisting the entry of stones is also provided at the closed end of the screening tray (8).

9. The highway bedrock screening system according to claim 1, characterized in that: A dust screen (9) is also provided above the screening tray (8), and the dust screen (9) is supported between the upper ends of the two side frames (3) by support rods. A suction fan (1102) is also provided on the inner side of the first gear (11), and the rotating shaft of the suction fan (1102) is fixedly connected to the rotating shaft of the first gear (11). The air intake of the suction fan (1102) faces above the screening tray (8), and the air outlet of the suction fan (1102) is connected to the conveying pipe (1103) to the dust removal water tank (4) on the corresponding side. The first gear (11) rotates synchronously to drive the suction fan (1102) to absorb the dust generated by screening and convey it to the dust removal water tank (4) for dust reduction treatment.

10. A highway foundation stone screening method, applicable to a highway foundation stone screening system according to any one of claims 1 to 9, characterized in that: The following steps are involved: First, stones are added from the feed guide (804) of the screening tray (8), and water is added to the dust removal water tank (4) until the conveying pipe (1103) is submerged; Second, the synchronous motor (501) in the driving frame (5) is started, and the driving shaft (502) is meshed with the worm wheel (1101) of the first gear (11) through the worm (5021), transmitting torque to two adjacent swing guide bodies (6), forming a linkage rotation mechanism, and causing the shift fork (604) of the swing guide body (6) to enter a circular motion state; Third, the shift fork (604) drives the one-way shifting rod (7) to move back and forth along the length direction of the screening tray (8) through the cooperation of the annular groove (602) and the hanging pin (701). When moving from the closed end to the open end, the shifting rod (702) keeps contacting the screen (802) downward under the action of the tension spring (7021), pushing the unscreened stones to move toward the open end. When returning from the open end, the shifting rod (702) moves up with the one-way shifting rod (7) to separate from the screen (802), thereby avoiding reverse interference with the stratified stones. Fourth, the swing guide body (6) drives the hanging piece (801) of the screening tray (8) to move back and forth horizontally through the sliding cooperation between the straight groove (603) and the clamping block (8011), and the hanging piece (801) of the screening tray (8) is vertically engaged with the lever (702), thereby ensuring that the one-way lever (7) can always be in a vertical state; Fifth, the stone material enters the closed end of the screening tray (8) through the feed guide body (804), and is successively screened through the screen mesh (802) with gradually increasing apertures for four-stage screening. The stone material that meets the apertures falls into the guide chamber (201) of the corresponding receiving tray (2), and the unscreened coarse material is temporarily stored through the retention slope (803) and then continues to move toward the open end, and finally enters the slag discharge tray (10). Through the periodic unidirectional pushing of the lever (702) and the reciprocating horizontal movement of the screening tray (8), a rolling-layering-pushing cycle of the stone material on the screen mesh (802) is formed. Combined with the interception effect of the retention slope (803), the thoroughness and efficiency of the multi-stage screening are improved; Sixth, the first gear (11) synchronously drives the suction fan (1102) to form a negative pressure zone above the screening tray (8), and the dust-laden air flow enters the suction fan (1102) through the dust-proof net (9) and is discharged into the dust removal water tank (4) through the conveying pipe (1103) for dust absorption and dust reduction treatment.

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