A gravel screening device for a loader

Abstract

The present invention discloses a gravel screening device for a loader, which relates to the technical field of screening equipment and includes a bucket connected to the lifting arm of the loader and a sieve cylinder communicated on the back of the bucket for material separation. Sieve holes for filtering materials are provided on the half circumferential surface of the sieve cylinder close to the bottom of the bucket; Reinforcing frames are fixedly arranged at equal intervals inside the sieve cylinder. For the gravel screening device of the loader, the loader drives the bucket to rotate with the opening facing upward and imports the materials into the channel between the sieve cylinder and the rotating cylinder. At the same time, the driving mechanism drives the stone inlet ports distributed at staggered equal angles through the rotating cylinder to scrape the gravel, facilitating the screening of the materials from multiple channels. When the dispersing frame at the front end of the central shaft rod and the material distributing rod at the tail end of the central shaft rod move in the wavy wave cavity, the dispersing mechanism will reciprocally disperse the shoveled or extruded materials through reciprocating undulation, ensuring that the device can efficiently screen the agglomerated materials and gravel.

Description

Technical Field

[0001] The present invention relates to the technical field of screening equipment, and particularly to a gravel screening device for a loader. Background Art

[0002] When carrying out industrial or agricultural production, it is often necessary to use loading machinery to scoop up particulate materials and then store them in a warehouse or load them into a cargo box. Most of the existing loaders use a front-mounted bucket. In order to ensure that the materials in the bucket can be directly stored, it is generally necessary to remove the gravel in the materials through a supporting screening device.

[0003] According to the Chinese patent with the publication number CN118874820A, a gravel screening device for a skid steer loader is disclosed. By providing a gravel screening device composed of a mounting plate and a screening mechanism, and setting the screening mechanism to be composed of a screening drum, a bottom plate and a rotating shaft, and installing an annular gear on the inner side wall of the rear end of the screening drum, the screening drum is driven from the edge position, thereby effectively reducing the torque required when the driving motor moves, and improving the actual operation effect of the gravel screening device;

[0004] When the screening drum of the above technical solution rotates to screen gravel, the gravel can be filtered and collected in the screening drum. When sticky and agglomerated materials appear in the screened materials, the screening drum will drive the agglomerated materials to roll when rotating and screening, and the agglomerated materials cannot be screened quickly. Summary of the Invention

[0005] The purpose of the present invention is to provide a gravel screening device for a loader to solve the problems raised in the above background art.

[0006] To achieve the above purpose, the present invention provides the following technical solution: A gravel screening device for a loader, including a bucket connected to the lifting arm of the loader and a sieve tube connected to the back of the bucket for material separation. Sieve holes for filtering materials are provided on the half circumferential surface of the sieve tube near the bottom of the bucket;

[0007] Reinforcement frames are fixedly arranged at equal intervals on the inner side of the sieve cylinder. Guide grooves are formed on both sides of the reinforcement frames, and a dispersion mechanism that moves along the guide grooves is further arranged on the side surface of the reinforcement frames. A rotating cylinder is movably connected to the center of the reinforcement frames. Stone inlet ports are arranged at equal angles with a dislocation on the outer peripheral side of the rotating cylinder, and the reinforcement frames are located between two adjacent stone inlet ports. A wear-resistant stone collecting groove installed at both ends of the inner wall of the sieve cylinder is arranged inside the rotating cylinder. A spiral slideway is formed on the inner wall of the rotating cylinder. A spiral guide rail communicated with the spiral slideway is fixedly arranged at the inner port end of the stone inlet port. Arc-shaped scraping plates with the same number as the stone inlet ports are slidably connected to the opening side of the wear-resistant stone collecting groove. A hollow spiral shaft for conveying crushed stones is arranged in the middle of the wear-resistant stone collecting groove. A driving mechanism for rotating the rotating cylinder and the hollow spiral shaft is arranged on the sieve cylinder.

[0008] Preferably, a discharge cover is installed on the outer side of one end of the sieve cylinder close to the hollow spiral shaft. A communication port is arranged on the side of the bucket close to the communication side of the sieve cylinder, and a baffle is rotatably connected in the communication port.

[0009] Preferably, the guide groove is composed of a U-shaped cavity, a wave cavity, and an arc-shaped buffer cavity communicating the U-shaped cavity and the wave cavity, and the wave cavity is of a wave-shaped structure.

[0010] Preferably, the dispersion mechanism includes a central shaft rod inserted into the guide groove, and a telescopic rod embedded and installed with the rotating cylinder is sleeved on the outer side of the central shaft rod.

[0011] Preferably, a dispersion frame is fixed on one side of the central shaft rod, a rotating block is movably connected to the other side of the central shaft rod, a material pushing rod is fixed at one end of the rotating block away from the central shaft rod, and the ends of the dispersion frame and the material pushing rod are both inserted into the guide groove.

[0012] Preferably, the driving mechanism includes a motor installed at the outer end of the sieve cylinder. A large gear disc is fixed at the output end of the motor, and the output end of the motor is also connected to the hollow spiral shaft in the wear-resistant stone collecting groove.

[0013] Preferably, a rotatable driving rod is inserted into a reserved hole on the outer peripheral side of the wear-resistant stone collecting groove, and a driving gear is sleeved and installed on the driving rod.

[0014] Preferably, one end of the driving rod penetrates and leads out from the end of the sieve cylinder, and adjacent driving rods are synchronously driven through a synchronous belt and a synchronous pulley. A small gear disc meshing with the large gear disc is installed on one of the driving rods.

[0015] Preferably, a gear ring that does not contact the outer wall of the wear-resistant stone collecting groove is arranged on the inner wall of the rotating cylinder, and the gear ring is meshed and connected with the driving gear.

[0016] Preferably, a vibration pin is fixed on the inner arc surface of the arc-shaped scraping plate, and a push-pull rod is fixed on the outer arc surface of the arc-shaped scraping plate.

[0017] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0018] 1. For the gravel screening device used in a loader, the loader drives the bucket to rotate with the opening facing upward and imports the materials into the channel between the screening cylinder and the rotating cylinder. At the same time, the driving mechanism drives the rotating cylinder to drive the stone inlet ports distributed at equal angles with misalignment to scrape the gravel, facilitating the screening of materials through multiple channels. When the dispersion frame at the front end of the central shaft rod and the material pushing rod at the tail end of the central shaft rod move in the wavy fluctuation cavity, the dispersion mechanism will reciprocally disperse the materials lifted or extruded through reciprocating undulation, ensuring that the device can efficiently screen the agglomerated materials and gravel;

[0019] 2. For the gravel screening device used in a loader, when the rotating cylinder rotates in a circle, the spiral slideway on the inner wall of the rotating cylinder and the spiral guide rail on the inner wall of the stone inlet port will drive the push-pull rod and the arc-shaped scraper to reciprocally move horizontally. Therefore, the misaligned spiral slideway and spiral guide rail can drive multiple arc-shaped scrapers to reciprocally move horizontally on the opening side of the wear-resistant stone collecting groove and drive the gravel to be dispersed and arranged in the hollow spiral shaft. Furthermore, it can reduce the resistance of the hollow spiral shaft to rotate and push the gravel out. And when the arc-shaped scraper reciprocally moves horizontally, the vibration pins on the inner arc surface can impact the irregular gravel stuck in the gap of the hollow spiral shaft, preventing the gravel from being stuck on the outside of the hollow spiral shaft and causing the gravel to be unable to be discharged. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 Schematic three-dimensional structure diagram of the gravel screening device with the bucket of the present invention placed horizontally;

[0021] Figure 2 Schematic three-dimensional structure diagram of the gravel screening device with the bucket of the present invention lifted upward;

[0022] Figure 3 First schematic three-dimensional structure diagram of the linkage of the screening cylinder, rotating cylinder and wear-resistant stone collecting groove of the present invention;

[0023] Figure 4 Second schematic three-dimensional structure diagram of the linkage of the screening cylinder, rotating cylinder and wear-resistant stone collecting groove of the present invention;

[0024] Figure 5 Schematic three-dimensional exploded structure diagram of the linkage of the screening cylinder, rotating cylinder and wear-resistant stone collecting groove of the present invention;

[0025] Figure 6 Schematic three-dimensional structure diagram of the combination of the reinforcement frame, rotating cylinder and dispersion mechanism of the present invention;

[0026] Figure 7 Schematic three-dimensional structure diagram of the combination of the reinforcement frame and dispersion mechanism of the present invention;

[0027] Figure 8Schematic three-dimensional structure diagram of the linkage between the rotary drum and the wear-resistant stone collecting tank of the present invention;

[0028] Figure 9 Schematic three-dimensional sectional structure diagram of the rotary drum of the present invention;

[0029] Figure 10 Schematic three-dimensional structure diagram of the wear-resistant stone collecting tank of the present invention;

[0030] Figure 11 Schematic front sectional structure diagram of the gravel screening device with the bucket placed horizontally according to the present invention;

[0031] Figure 12 Schematic front sectional structure diagram of the gravel screening device with the bucket lifted upward according to the present invention.

[0032] In the figure: 1. Bucket; 101. Baffle; 2. Screening cylinder; 201. Screening holes; 3. Reinforcement frame; 301. Guide groove; 301a. U-shaped cavity; 301b. Fluctuating cavity; 4. Rotary drum; 401. Stone inlet; 402. Gear ring; 403. Spiral chute; 404. Spiral guide rail; 5. Wear-resistant stone collecting tank; 501. Arc-shaped scraper; 502. Vibration pin; 503. Push-pull rod; 6. Driving mechanism; 601. Motor; 602. Large gear disc; 603. Driving rod; 604. Driving gear; 605. Small gear disc; 7. Hollow spiral shaft; 8. Dispersion mechanism; 801. Central shaft rod; 802. Dispersion frame; 803. Rotating block; 804. Material pushing rod; 9. Discharge cover; 10. Telescopic rod. Detailed implementation manners

[0033] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0034] Please refer to Figures 1 - 5 and Figures 8 - 12 , the present invention provides a technical solution: a gravel screening device for a loader, including a bucket 1 connected to the lifting arm of the loader and a screening cylinder 2 connected to the back of the bucket 1 for material separation. Screening holes 201 for filtering materials are provided on the half circumferential surface of the screening cylinder 2 close to the bottom of the bucket 1;

[0035] Inside the sieve cylinder 2, reinforcement frames 3 are fixed at equal intervals. Guide grooves 301 are formed on both sides of the reinforcement frame 3, and a dispersion mechanism 8 that moves along the guide grooves 301 is arranged on the side of the reinforcement frame 3. The center of the reinforcement frame 3 is movably connected to a rotating cylinder 4. Stone inlet ports 401 are arranged at equal angles with a dislocation on the outer peripheral side of the rotating cylinder 4, and the reinforcement frame 3 is located between two adjacent stone inlet ports 401. Inside the rotating cylinder 4, wear-resistant stone collection grooves 5 installed at both ends of the inner wall of the sieve cylinder 2 are provided. The openings of the wear-resistant stone collection grooves 5 face upward. When the stone inlet ports 401 of the rotating cylinder 4 rotate to face upward and gravel is introduced into the wear-resistant stone collection grooves 5, the wear-resistant stone collection grooves 5 can collect the gravel. After the bucket 1 scoops up the material, it rotates 30 - 60° for material screening; a spiral slideway 403 is formed on the inner wall of the rotating cylinder 4, and a spiral guide rail 404 communicating with the spiral slideway 403 is fixed at the inner port end of the stone inlet port 401. A hollow spiral shaft 7 for conveying gravel is arranged in the middle of the wear-resistant stone collection groove 5. A driving mechanism 6 for the rotating cylinder 4 and the hollow spiral shaft 7 to rotate is arranged on the sieve cylinder 2; the driving mechanism 6 includes a motor 601 installed at the outer end of the sieve cylinder 2. The output end of the motor 601 is fixed with a large gear disk 602, and the output end of the motor 601 is also connected to the hollow spiral shaft 7 in the wear-resistant stone collection groove 5. The hollow spiral shaft 7 is driven to rotate by the motor 601, and the rotating hollow spiral shaft 7 will rotate to push the gravel collected in the wear-resistant stone collection groove 5 and export it along the discharge cover 9;

[0036] A rotatable driving rod 603 is inserted into a reserved hole on the outer peripheral side of the wear-resistant stone collection groove 5, and a driving gear 604 is sleeved and installed on the driving rod 603; one end of the driving rod 603 penetrates and extends out from the end of the sieve cylinder 2, and adjacent driving rods 603 are synchronously driven by a synchronous belt and synchronous pulleys. A small gear disk 605 meshing with the large gear disk 602 is installed on one of the driving rods 603;

[0037] A gear ring 402 that does not contact the outer wall of the wear-resistant stone collection groove 5 is arranged on the inner wall of the rotating cylinder 4, and the gear ring 402 is meshed and connected with the driving gear 604. The tooth number ratio of the large gear disk 602 to the small gear disk 605 is greater than 1. Since the large gear disk 602 and the hollow spiral shaft 7 are coaxially arranged, when the large gear disk 602 drives the hollow spiral shaft 7 to rotate one circle, the small gear disk 605 meshing with the large gear disk 602 will drive the driving rod 603 to rotate more than one circle. Therefore, the driving rod 603 will drive the rotating cylinder 4 to rotate and scrape the material through the driving gear 604. By setting the tooth number ratio of the large gear disk 602 to the small gear disk 605 to be greater than 1, the speed difference between the rotation of the hollow spiral shaft 7 and the rotating cylinder 4 can be adjusted, facilitating the regulation of the gravel export rate according to the actual screening rate of the material and the gravel.

[0038] Please refer to Figure 1 、 Figure 2 、 Figures 4 - 7 、 Figure 11 and Figure 12, on the outer side of one end of the screening cylinder 2 close to the hollow spiral shaft 7, a discharge hood 9 is installed, and outlets for discharging crushed stones are arranged at equal angles on the outer peripheral side of the discharge hood 9; a communication port is arranged on the side of the bucket 1 close to the communication side of the screening cylinder 2, and a baffle 101 is rotatably connected in the communication port. When the material enters the channel between the screening cylinder 2 and the rotating cylinder 4 along the communication port, the baffle 101 can block the material and ensure that the material enters the screen holes 201 on one side of the screening cylinder 2;

[0039] The guiding groove 301 is composed of a U-shaped cavity 301a, a wave cavity 301b, and an arc-shaped buffer cavity connecting the U-shaped cavity 301a and the wave cavity 301b. The wave cavity 301b is a wavy structure. When the dispersing mechanism 8 moves in the U-shaped cavity 301a, the arc-shaped buffer cavity, and the wave cavity 301b, it can drive the central shaft rod 801, the dispersing frame 802, and the material pushing rod 804 to adjust the state of generating a yaw angle in the circumferential direction;

[0040] The dispersing mechanism 8 includes a central shaft rod 801 inserted into the guiding groove 301. A telescopic rod 10 installed inlaid with the rotating cylinder 4 is sleeved on the outer side of the central shaft rod 801. A dispersing frame 802 is fixed on one side of the central shaft rod 801. When the central shaft rod 801, the dispersing frame 802, and the material pushing rod 804 yaw and move along the guiding groove 301, the telescopic rod 10 can cooperate with the movement of the central shaft rod 801 to realize the telescopic adjustment of the length;

[0041] On the other side of the central shaft rod 801, a rotating block 803 is movably connected. A material pushing rod 804 is fixed at one end of the rotating block 803 away from the central shaft rod 801. The ends of the dispersing frame 802 and the material pushing rod 804 are both inserted into the guiding groove 301.

[0042] During specific implementation, when the material mixed with crushed stones is loaded into the bucket 1 of the loader, the bucket 1 is lifted by the lifting arm of the loader, causing the opening of the bucket 1 to rotate upward by 30 - 60°, so that the scooped material can be guided into the channel between the sieve cylinder 2 and the rotating cylinder 4. And part of the material will be screened and filtered by the sieve holes 201 on the surface of the sieve cylinder 2. At the same time, the motor 601 of the driving mechanism 6 drives the large gear disc 602 to rotate. The rotation of the large gear disc 602 meshing with the small gear disc 605 will cause one of the driving rods 603 to rotate. At this time, the adjacent two driving rods 603 are driven by synchronous wheels and synchronous belts, so that all the driving rods 603 will drive the driving gear 604 to mesh with the rotating cylinder 4 outside the wear-resistant stone-collecting groove 5 when rotating synchronously. Thus, the rotating cylinder 4 will rotate, and the rotating cylinder 4 will drive the stone inlet 401 distributed at staggered equal angles to rotate. At the same time, the rotating stone inlet 401 will rotate towards the communication port between the bucket 1 and the sieve cylinder 2, so that the stone inlet 401 will scrape the material in the communication port along the gap between the rotating cylinder 4 and the sieve cylinder 2, so that the material can be filtered and exported along the sieve holes 201. At the same time, the gap between the rotating cylinder 4 and the sieve cylinder 2 is separated by a plurality of reinforcing frames 3, so that the material enters along the separated channels in a distributed manner and completes multi-channel screening. When the sieve holes 201 screen and collect the crushed stones, the rotating cylinder 4 drives the stone inlet 401 to rotate until the opening faces upward, and the crushed stones will be filled into the stone inlet 401, and the crushed stones will enter the wear-resistant stone-collecting groove 5 along the stone inlet 401;

[0043] When the rotating cylinder 4 drives the stone inlet 401 distributed at staggered equal angles to intermittently enter the multi-channels between the rotating cylinder 4 and the sieve cylinder 2, the rotating cylinder 4 will pull the middle shaft rod 801 to move along the guide groove 301 through the telescopic rod 10. When the stone inlet 401 rotates to a position close to the U-shaped cavity 301a of the reinforcing frame 3, the telescopic rod 10 will drive the middle shaft rod 801, the dispersion frame 802 and the material-receiving rod 804 to move along the U-shaped cavity 301a, the arc-shaped buffer cavity and the wave cavity 301b. When the dispersion frame 802 at the front end of the middle shaft rod 801 and the material-receiving rod 804 at the tail end of the middle shaft rod 801 move in the U-shaped cavity 301a, the dispersion frame 802, the middle shaft rod 801 and the material-receiving rod 804 will not disperse and scrape the material entering the multi-channels;

[0044] When the dispersion rack 802 at the front end of the central shaft rod 801 and the material pushing rod 804 at the tail end of the central shaft rod 801 move in the wavy cavity 301b, the dispersion rack 802, the central shaft rod 801 and the material pushing rod 804 will produce wavy undulations in the wavy cavity 301b. At the same time, the dispersion mechanism 8 will also move in a circular trajectory following the rotation of the rotating cylinder 4. Therefore, the dispersion rack 802, the central shaft rod 801 and the material pushing rod 804 will swing and undulate in the cavity 301b to disperse and extrude the material. When the central shaft rod 801 and the dispersion rack 802 are tilted upward along the cavity 301b, the material will be shoveled up. When the central shaft rod 801 and the dispersion rack 802 move downward along the cavity 301b, they will be obliquely inserted into the material for extrusion, causing the material to move towards the sieve holes 201. And when the central shaft rod 801 reciprocates up and down along the cavity 301b, it will drive the material pushing rod 804 to produce wavy yaw through the rotating block 803, so that the material pushing rod 804 can reciprocally disperse the shoveled or extruded material;

[0045] A plurality of dispersion mechanisms 8 are arranged on the outer peripheral side of the rotating cylinder 4, so that before the rotating cylinder 4 drives a plurality of stone inlets 401 to scrape the material and crush the stones, the material between the rotating cylinder 4 and the sieve cylinder 2 can be intermittently dispersed multiple times through the plurality of dispersion mechanisms 8, and the sticky agglomerated material can also be crushed.

[0046] Please refer to Figure 5 、 Figure 8 and Figure 10 As shown in, the opening side of the wear-resistant stone collecting groove 5 is slidably connected with arc-shaped scraping plates 501 having the same number as the stone inlets 401. A vibration pin 502 is fixed on the inner arc surface of the arc-shaped scraping plate 501, and a push-pull rod 503 is fixed on the outer arc surface of the arc-shaped scraping plate 501.

[0047] During specific implementation, when the rotating cylinder 4 rotates in a circle, the spiral slideway 403 on the inner wall of the rotating cylinder 4 and the spiral guide rail 404 on the inner wall of the stone inlet 401 will slide with the push-pull rod 503 on the outer arc surface of the arc-shaped scraping plate 501, so that the combination of the spiral slideway 403 and the spiral guide rail 404 can drive the push-pull rod 503 to reciprocate horizontally. Through the push-pull rod 503, the arc-shaped scraping plate 501 can be horizontally reciprocally pulled, so that the staggered spiral slideway 403 and spiral guide rail 404 can drive a plurality of arc-shaped scraping plates 501 to reciprocally move horizontally on the opening side of the wear-resistant stone collecting groove 5 and drive the crushed stones to be dispersed and arranged in the hollow spiral shaft 7, thereby reducing the resistance of the hollow spiral shaft 7 to rotate and push the crushed stones out; and when the arc-shaped scraping plate 501 reciprocates horizontally, it can impact the irregular crushed stones stuck in the gap of the hollow spiral shaft 7 through the vibration pin 502 on the inner arc surface, preventing the crushed stones from being stuck on the outside of the hollow spiral shaft 7 and causing the crushed stones to be unable to be discharged.

[0048] In summary, the loader's bucket 1 is used to load the material mixed with crushed stones into the bucket 1, and the bucket 1 is lifted by the loader's lifting arm to guide the material into the channel between the sieve cylinder 2 and the rotary cylinder 4. The material is screened and filtered using the sieve holes 201, and the rotary cylinder 4 scrapes the crushed stones into the wear-resistant stone-collecting groove 5 through the stone inlet 401. At the same time, the hollow spiral shaft 7 rotates to push the crushed stones in the wear-resistant stone-collecting groove 5 and export them along the discharge hood 9, ensuring that the device can efficiently screen the material and the crushed stones. The content not described in detail in this specification belongs to the prior art well-known to those skilled in the art.

[0049] Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements for some of the technical features. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A gravel screening device for a loader, comprising a bucket (1) connected to a lifting arm of the loader and a screen drum (2) connected to the back of the bucket (1) for material separation, wherein a screen hole (201) for filtering materials is provided on a half circumferential surface of the screen drum (2) close to the bottom of the bucket (1); the characteristics are as follows: A reinforcement frame (3) is fixed at equal intervals on the inner side of the sieve drum (2), guide grooves (301) are provided on both sides of the reinforcement frame (3), and a dispersion mechanism (8) that moves along the guide grooves (301) is also provided on the side of the reinforcement frame (3), a rotating drum (4) is movably connected to the center of the reinforcement frame (3), stone inlets (401) are provided on the outer peripheral side of the rotating drum (4) at equal angles, and the reinforcement frame (3) is located between two adjacent stone inlets (401), and a plurality of guide grooves (401) are provided inside the rotating drum (4) to be mounted on both ends of the inner wall of the sieve drum (2). A wear-resistant stone collecting trough (5), wherein the inner wall of the rotating drum (4) is provided with a spiral slideway (403), the inner end of the stone inlet (401) is fixed with a spiral guide rail (404) in communication with the spiral slideway (403), the opening side of the wear-resistant stone collecting trough (5) is slidably connected with arc-shaped scrapers (501) of the same number as the stone inlet (401), a hollow spiral shaft (7) for conveying crushed stones is provided in the middle of the wear-resistant stone collecting trough (5), and a driving mechanism (6) for rotating the rotating drum (4) and the hollow spiral shaft (7) is provided on the screen drum (2); The guide groove (301) is composed of a U-shaped cavity (301a), a wave cavity (301b), and an arc-shaped buffer cavity connecting the U-shaped cavity (301a) and the wave cavity (301b); the wave cavity (301b) is a wave-shaped structure; The dispersion mechanism (8) comprises a central axis rod (801) inserted into the guide groove (301), and a telescopic rod (10) embedded in the rotating drum (4) is sleeved on the outer side of the central axis rod (801); A dispersion rack (802) is fixed on one side of the central axis (801), a rotating block (803) is movably connected to the other side of the central axis (801), a material shifting rod (804) is fixed to one end of the rotating block (803) away from the central axis (801), and the ends of the dispersion rack (802) and the material shifting rod (804) are both inserted into the guide groove (301); A vibration pin (502) is fixed to the inner arc surface of the arc-shaped scraper (501), and a push-pull rod (503) is fixed to the outer arc surface of the arc-shaped scraper (501).

2. A crushed stone screening device for a loader according to claim 1, characterized in that: A discharge cover (9) is installed on the outer side of the screen drum (2) close to one end of the hollow spiral shaft (7), and a communication port is provided on the communication side of the bucket (1) close to the screen drum (2), and a baffle (101) is rotatably connected in the communication port.

3. The crushed stone screening device for a loader according to claim 1, characterized in that: The driving mechanism (6) comprises a motor (601) mounted on the outer end of the screen drum (2), a large toothed disc (602) being fixed to the output end of the motor (601), and the output end of the motor (601) is also connected to a hollow spiral shaft (7) in the wear-resistant stone collecting trough (5).

4. A crushed stone screening device for a loader according to claim 3, characterized in that: A rotatable driving rod (603) is inserted into a reserved hole on the outer peripheral side of the wear-resistant stone collecting trough (5), and a driving gear (604) is sleeved and mounted on the driving rod (603).

5. A crushed stone screening device for a loader according to claim 4, characterized in that: One end of the driving rod (603) is led out from the end of the screen drum (2), and two adjacent driving rods (603) are synchronously driven via a synchronous belt and a synchronous wheel, wherein a small toothed disc (605) meshing with a large toothed disc (602) is mounted on one of the driving rods (603).

6. A crushed stone screening device for a loader according to claim 5, characterized in that: The inner wall of the rotating drum (4) is provided with a gear ring (402) which is not in contact with the outer wall of the wear-resistant stone collecting trough (5), and the gear ring (402) is meshingly connected with the driving gear (604).

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