Gravel screening device for loading machine

Abstract

The invention discloses a broken stone screening device for a loader, and relates to the technical field of screening equipment, the broken stone screening device comprises a bucket connected to a lifting arm of the loader and a screen drum communicated to the back of the bucket and used for material separation, and screen holes used for filtering materials are formed in the half circumferential surface, close to the bottom of the bucket, of the screen drum; reinforcing frames are fixed to the inner side of the screen drum at equal intervals. According to the broken stone screening device for the loading machine, the loading machine drives an opening of the bucket to rotate upwards, materials are guided into a channel between the screen drum and the rotary drum, meanwhile, the driving mechanism drives the stone inlets which are distributed in a staggered and equal-included-angle mode through the rotary drum to scrape broken stones, and the materials can be conveniently screened from multiple channels; when the dispersing frame at the front end of the middle shaft rod and the material stirring rod at the tail end of the middle shaft rod move in the wave-shaped fluctuation cavity, the dispersing mechanism can disperse shoveled or extruded materials in a reciprocating mode through reciprocating fluctuation, and it is ensured that the device can efficiently screen clustered materials and broken stones.

Description

Technical Field

[0001] The invention relates to the technical field of screening equipment, in particular to a crushed stone screening device for a loader. Background Art

[0002] In industrial or agricultural production, it is often necessary to use loading machinery to scoop up granular materials and then send them to the warehouse or load them into the cargo box for storage. Most existing loaders use front-mounted buckets. In order to ensure that the materials in the bucket can be directly stored, it is generally necessary to use a matching screening device to screen out the gravel in the materials.

[0003] According to the Chinese patent with the announcement number CN118874820A, a crushed stone screening device for a skid loader is disclosed, by providing a crushed stone screening device composed of a mounting plate and a screening mechanism, and the screening mechanism is arranged to be composed of a screening drum, a bottom plate and a rotating shaft, and a ring gear is installed on the inner side wall of the rear side end of the screening drum, so that the screening drum is driven from the edge position, thereby effectively reducing the torque required when the driving motor moves, thereby improving the actual operation effect of the crushed stone screening device; When the screening drum of the above technical solution rotates to screen the gravel, the gravel can be filtered and collected in the screening drum. When the screened material is sticky and clumped, the screening drum will drive the clumped material to roll when rotating and screening, and the clumped material cannot be screened quickly. Summary of the invention

[0004] The object of the present invention is to provide a gravel screening device for a loader to solve the problems raised by the above background technology.

[0005] To achieve the above object, the present invention provides the following technical solution: a crushed stone screening device for a loader, comprising a bucket connected to a lifting arm of the loader and a screen cylinder connected to the back of the bucket for material separation, wherein the screen cylinder has a screen hole for filtering the material on a half circumferential surface close to the bottom of the bucket; A reinforcement frame is fixed at equal intervals on the inner side of the screen drum, guide grooves are provided on both sides of the reinforcement frame, and a dispersion mechanism that moves along the guide grooves is also provided on the side of the reinforcement frame, a rotating drum is movably connected to the center of the reinforcement frame, stone inlets are provided on the outer peripheral side of the rotating drum at equal angles, and the reinforcement frame is located between two adjacent stone inlets, a wear-resistant stone collecting trough installed on both ends of the inner wall of the screen drum is provided inside the rotating drum, a spiral slide is provided on the inner wall of the rotating drum, a spiral guide rail connected to the spiral slide is fixed at the inner end of the stone inlet, the opening side of the wear-resistant stone collecting trough is slidably connected with an arc scraper with the same number as the stone inlet, a hollow spiral shaft for conveying crushed stone is provided in the middle of the wear-resistant stone collecting trough, and a driving mechanism for rotating the rotating drum and the hollow spiral shaft is provided on the screen drum.

[0006] Preferably, a discharge cover is installed on the outer side of the screen cylinder near one end of the hollow spiral shaft, and a connecting port is provided on the connecting side of the bucket near the screen cylinder, and a baffle is rotatably connected in the connecting port.

[0007] Preferably, the guide groove is composed of a U-shaped cavity, a wave cavity and an arc-shaped buffer cavity connecting the U-shaped cavity and the wave cavity, and the wave cavity is a wave-shaped structure.

[0008] Preferably, the dispersion mechanism comprises a central axis rod inserted in the guide groove, and a telescopic rod embedded in the rotating drum is sleeved on the outer side of the central axis rod.

[0009] Preferably, a dispersion rack is fixed on one side of the central axis, a rotating block is movably connected to the other side of the central axis, a material removal rod is fixed to the end of the rotating block away from the central axis, and the ends of the dispersion rack and the material removal rod are both inserted into the guide groove.

[0010] Preferably, the driving mechanism includes a motor installed at the outer end of the screen drum, a large toothed disc is fixed to 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 trough.

[0011] Preferably, a rotatable driving rod is inserted into a reserved hole on the outer peripheral side of the wear-resistant stone collecting trough, and a driving gear is sleeved and installed on the driving rod.

[0012] Preferably, one end of the driving rod is led out from the end of the screen drum, and two adjacent driving rods are synchronously driven through a synchronous belt and a synchronous wheel, and a small toothed disc meshing with a large toothed disc is installed on one of the driving rods.

[0013] Preferably, the inner wall of the rotating drum is provided with a gear ring which is not in contact with the outer wall of the wear-resistant stone collecting trough, and the gear ring is meshingly connected with the driving gear.

[0014] Preferably, a vibration pin is fixed to the inner arc surface of the arc scraper, and a push-pull rod is fixed to the outer arc surface of the arc scraper.

[0015] Compared with the prior art, the present invention has the following beneficial effects: 1. The gravel screening device for the loader drives the bucket opening to rotate upward and guides the material into the channel between the screen drum and the rotating drum. At the same time, the driving mechanism drives the staggered and equi-angled stone inlets to scrape the gravel through the rotating drum, so that the material can be screened from multiple channels. When the dispersion frame at the front end of the middle shaft and the material-dispensing rod at the rear end of the middle shaft move in the wave-shaped fluctuation cavity, the dispersion mechanism can reciprocate and disperse the scooped or squeezed material through reciprocating fluctuations, ensuring that the device can achieve efficient screening of agglomerated materials and gravel; 2. The gravel screening device for the loader, when the drum rotates in a circle, the spiral slideway on the inner wall of the drum and the spiral guide rail on the inner wall of the stone inlet will drive the push-pull rod and the arc scraper to move back and forth, so that the dislocated spiral slideway and spiral guide rail can drive multiple arc scrapers to move back and forth on the opening side of the wear-resistant stone collecting trough and drive the gravel to be dispersed and arranged in the hollow spiral shaft, thereby reducing the resistance of the hollow spiral shaft to push the gravel out, and the arc scraper can hit the irregular gravel stuck in the gap of the hollow spiral shaft through the vibration pin on the inner arc surface when moving back and forth, so as to prevent the gravel from being stuck on the outside of the hollow spiral shaft and making it impossible to discharge the gravel. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of the three-dimensional structure of the gravel screening device of the present invention with the bucket placed horizontally; Figure 2 It is a schematic diagram of the three-dimensional structure of the gravel screening device with the bucket lifted upwards according to the present invention; Figure 3 It is a schematic diagram of the first three-dimensional structure of the linkage of the screen drum, the rotating drum and the wear-resistant stone collecting trough of the present invention; Figure 4 It is a schematic diagram of a second three-dimensional structure of the linkage of the screen drum, the rotating drum and the wear-resistant stone collecting trough of the present invention; Figure 5 It is a schematic diagram of a three-dimensional explosion structure in which a screen drum, a rotating drum and a wear-resistant stone collecting trough are linked in the present invention; Figure 6 It is a three-dimensional structural schematic diagram of the reinforcement frame, the rotating drum and the dispersion mechanism combination of the present invention; Figure 7 It is a schematic diagram of the three-dimensional structure of the reinforcement frame and the dispersion mechanism combination of the present invention; Figure 8 It is a schematic diagram of the three-dimensional structure of the linkage between the rotary drum and the wear-resistant stone collecting trough of the present invention; Fig. 9 It is a schematic diagram of the three-dimensional cross-section structure of the rotary drum of the present invention; Fig.10 It is a schematic diagram of the three-dimensional structure of the wear-resistant stone collecting trough of the present invention; Fig.11 It is a schematic diagram of the front view of the cutaway structure of the gravel screening device of the present invention with the bucket placed horizontally; Fig.12 This is a schematic diagram of the front view of the cut structure of the gravel screening device with the bucket lifted upward according to the present invention.

[0017] In the figure: 1, bucket; 101, baffle; 2, screen drum; 201, screen hole; 3, reinforcement frame; 301, guide groove; 301a, U-shaped cavity; 301b, wave cavity; 4, rotating drum; 401, stone inlet; 402, gear ring; 403, spiral slide; 404, spiral guide rail; 5, wear-resistant stone collecting trough; 501, arc scraper; 502, vibration pin; 503, push-pull rod; 6, driving mechanism; 601, motor; 602, large gear plate; 603, driving rod; 604, driving gear; 605, small gear plate; 7, hollow spiral shaft; 8, dispersion mechanism; 801, middle shaft rod; 802, dispersion frame; 803, rotating block; 804, material diverter rod; 9, discharge cover; 10, telescopic rod. DETAILED DESCRIPTION

[0018] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments 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.

[0019] See also Figure 1-Figure 5 as well as Figure 8-Figure 12 The present invention provides a technical solution: a crushed stone 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 near the bottom of the bucket 1; A reinforcement frame 3 is fixed equidistantly on the inner side of the screen drum 2, guide grooves 301 are provided on both sides of the reinforcement frame 3, and a dispersion mechanism 8 moving 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 wear-resistant stone collecting trough 5 installed at both ends of the inner wall of the screen drum 2 is provided inside the rotating drum 4, and the opening of the wear-resistant stone collecting trough 5 is arranged upward, when the stone inlet 401 of the rotating drum 4 is rotated to face upward and guide the crushed stone into the wear-resistant stone collecting trough 5, the wear-resistant stone collecting trough 5 can collect the crushed stone, and the bucket 1 rotates 30-60° after shoveling the material. The material is screened; a spiral slide 403 is provided on the inner wall of the drum 4, a spiral guide rail 404 connected to the spiral slide 403 is fixed to the inner end of 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 drum 4 and the hollow spiral shaft 7 is provided on the screen drum 2; the driving mechanism 6 includes a motor 601 installed on the outer end of the screen drum 2, a large toothed disc 602 is fixed to the output end of the motor 601, and the output end of the motor 601 is also connected to the hollow spiral shaft 7 in the wear-resistant stone collecting trough 5, and the hollow spiral shaft 7 is driven to rotate by the motor 601, and the rotating hollow spiral shaft 7 will rotate and push the crushed stones collected in the wear-resistant stone collecting trough 5 and be discharged along the discharge cover 9; A rotatable driving rod 603 is inserted into the reserved hole on the outer peripheral side of the wear-resistant stone collecting trough 5, and a driving gear 604 is sleeved on the driving rod 603; 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 by a synchronous belt and a synchronous wheel, and a small toothed disc 605 meshing with the large toothed disc 602 is installed on one of the driving rods 603; The inner wall of the rotating drum 4 is provided with a gear ring 402 which does not contact the outer wall of the wear-resistant stone collecting trough 5, and the gear ring 402 is meshed with the driving gear 604. The gear ratio of the large gear plate 602 and the small gear plate 605 is greater than 1. Since the large gear plate 602 is coaxially arranged with the hollow spiral shaft 7, when the large gear plate 602 drives the hollow spiral shaft 7 to rotate one circle, the small gear plate 605 meshing with the large gear plate 602 will drive the driving rod 603 to rotate more than one circle. Therefore, the driving rod 603 will drive the rotating drum 4 to rotate and scrape the material through the driving gear 604. By setting the gear ratio of the large gear plate 602 and the small gear plate 605 to be greater than 1, the speed difference between the rotation of the hollow spiral shaft 7 and the rotating drum 4 can be adjusted, so that the rate of crushed stone export can be adjusted according to the actual rate of screening materials and crushed stones.

[0020] See also Figure 1 , Figure 2 , Figure 4-Figure 7 , Fig.11 and Fig.12A discharge cover 9 is installed on the outer side of the screen drum 2 near one end of the hollow spiral shaft 7, and an outlet for discharging crushed stones is opened at an equal angle on the outer peripheral side of the discharge cover 9; a connecting port is provided on the connecting side of the bucket 1 near the screen drum 2, and a baffle 101 is rotatably connected in the connecting port. When the material enters the channel between the screen drum 2 and the rotating drum 4 along the connecting port, the baffle 101 can block the material and ensure that the material enters the screen hole 201 on one side of 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. When the dispersion mechanism 8 moves in the U-shaped cavity 301a, the arc-shaped buffer cavity and the wave cavity 301b, it can drive the central axis rod 801, the dispersion frame 802 and the material-moving rod 804 to adjust the state of the swing angle in the circumferential direction. The dispersion mechanism 8 includes a central axis rod 801 inserted into the guide groove 301, and a telescopic rod 10 embedded with the rotating drum 4 is sleeved on the outer side of the central axis rod 801. A dispersion frame 802 is fixed to one side of the central axis rod 801. When the central axis rod 801, the dispersion frame 802 and the material-dispensing rod 804 move along the guide groove 301, the telescopic rod 10 can cooperate with the movement of the central axis rod 801 to achieve telescopic adjustment of the length. The other side of the central axis 801 is movably connected with a rotating block 803 , and the end of the rotating block 803 away from the central axis 801 is fixed with a material shifting rod 804 . The ends of the dispersion rack 802 and the ends of the material shifting rod 804 are both inserted into the guide groove 301 .

[0021] In 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, so that the opening of the bucket 1 is rotated upward by 30-60 degrees, so that the shoveled material can be introduced into the channel between the screen drum 2 and the rotating drum 4, and part of the material will be screened and filtered by the screen holes 201 on the surface of the screen drum 2. At the same time, the motor 601 of the driving mechanism 6 drives the large toothed disc 602 to rotate, and the rotating large toothed disc 602 engages with the small toothed disc 605 to rotate one of the driving rods 603. At this time, the two adjacent driving rods 603 are driven by the synchronous wheel and the synchronous belt, so that all the driving rods 603 will drive the driving gear 604 to engage with the rotating drum 4 outside the wear-resistant stone collecting trough 5 when rotating synchronously. Thus, the drum 4 will rotate, and the drum 4 will drive the staggered and equi-angled stone inlet 401 to rotate, and at the same time, the rotating stone inlet 401 will rotate toward the connecting port of the bucket 1 and the screen drum 2, so that the stone inlet 401 will scrape the materials in the connecting port along the gap between the drum 4 and the screen drum 2, so that the materials can be filtered out and exported along the screen holes 201, and at the same time, the gap between the drum 4 and the screen drum 2 is separated by a plurality of reinforcement frames 3, so that the materials are distributed along the separated channels and multi-channel screening is completed; when the screen holes 201 screen and collect the crushed stones, the drum 4 drives the stone inlet 401 to rotate until the opening faces upward, and the crushed stones are filled into the stone inlet 401, and the crushed stones enter the wear-resistant stone collecting trough 5 along the stone inlet 401; When the drum 4 drives the stone inlets 401 with staggered equal angle distribution to intermittently enter the multi-channels between the drum 4 and the screen drum 2, the drum 4 will pull the central axis rod 801 to move along the guide groove 301 through the telescopic rod 10, and when the stone inlet 401 rotates to the U-shaped cavity 301a position close to the reinforcement frame 3, the telescopic rod 10 will drive the central axis rod 801, the dispersion rack 802 and the material removal rod 804 to move along the U-shaped cavity 301a, the arc-shaped buffer cavity and the wave cavity 301b; when the dispersion rack 802 at the front end of the central axis rod 801 and the material removal rod 804 at the rear end of the central axis rod 801 move in the U-shaped cavity 301a, the dispersion rack 802, the central axis rod 801 and the material removal rod 804 will not disperse and scrape the materials entering the multi-channels; When the dispersion rack 802 at the front end of the middle shaft 801 and the material-discharging rod 804 at the rear end of the middle shaft 801 move in the wavy fluctuation chamber 301b, the dispersion rack 802, the middle shaft 801 and the material-discharging rod 804 will produce wavy fluctuations in the wavy fluctuation chamber 301b, and the dispersion mechanism 8 will also move in a circular trajectory following the rotation of the drum 4, so the dispersion rack 802, the middle shaft 801 and the material-discharging rod 804 will swing and fluctuate in the fluctuation chamber 301b to disperse and squeeze the material. When the middle shaft 801 and the dispersion rack 802 are lifted up along the wave cavity 301b, the materials will be scooped up. When the middle shaft 801 and the dispersion rack 802 are moved downward along the wave cavity 301b, they will be inserted obliquely into the materials to squeeze them, so that the materials move toward the sieve hole 201. When the middle shaft 801 reciprocates along the wave cavity 301b, it will drive the material-moving rod 804 to produce a wave-shaped deflection through the rotating block 803, so that the material-moving rod 804 can reciprocate and disperse the scooped or squeezed materials. A plurality of dispersion mechanisms 8 are arranged on the outer peripheral side of the rotating drum 4, so that before the rotating drum 4 drives the plurality of stone inlets 401 to scrape the material and crush the stone, the plurality of dispersion mechanisms 8 can be used to disperse the material between the rotating drum 4 and the screen drum 2 for multiple times in an intermittent manner, and can also crush the material that is stuck together.

[0022] See also Figure 5 , Figure 8 and Fig.10 The opening side of the wear-resistant stone collecting trough 5 is slidably connected with an arc scraper 501 having the same number as the stone inlet 401, a vibration pin 502 is fixed to the inner arc surface of the arc scraper 501, and a push-pull rod 503 is fixed to the outer arc surface of the arc scraper 501.

[0023] In specific implementation, when the drum 4 rotates in a circle, the spiral slide 403 on the inner wall of the drum 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 scraper 501, so that the combination of the spiral slide 403 and the spiral guide rail 404 can drive the push-pull rod 503 to move back and forth, and the arc scraper 501 can be pulled back and forth laterally by the push-pull rod 503, so that the dislocated spiral slide 403 and the spiral guide rail 404 can drive multiple arc scrapers 501 to move back and forth on the opening side of the wear-resistant stone collecting trough 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 scraper 501 moves back and forth, it can hit the irregular crushed stones stuck in the gap of the hollow spiral shaft 7 through the vibration pin 502 on the inner arc surface, so as to prevent the crushed stones from being stuck on the outside of the hollow spiral shaft 7 and making it impossible to discharge the crushed stones.

[0024] To summarize, the material mixed with gravel is loaded into the bucket 1 through the bucket 1 of the loader, and the bucket 1 is lifted by the lifting arm of the loader to introduce the material into the channel between the screen drum 2 and the rotating drum 4, the material is screened and filtered by the screen hole 201, and the rotating drum 4 scrapes the gravel into the wear-resistant stone collecting trough 5 through the stone inlet 401, and at the same time, the hollow spiral shaft 7 is used to rotate and push the gravel in the wear-resistant stone collecting trough 5 and discharge it along the discharge cover 9, ensuring that the device can efficiently screen the material and gravel. The contents not described in detail in this specification belong to the prior art known to professional and technical personnel in this field.

[0025] Although the present invention has been described in detail with reference to the aforementioned embodiments, it is still possible for those skilled in the art to modify the technical solutions described in the aforementioned embodiments, or to make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in 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), 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) connected to 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), the middle part of the wear-resistant stone collecting trough (5) is provided with a hollow spiral shaft (7) for conveying crushed stone, and the screen drum (2) is provided with a driving mechanism (6) for rotating the rotating drum (4) and the hollow spiral shaft (7).

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 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.

4. A crushed stone screening device for a loader according to claim 3, characterized in that: 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).

5. A crushed stone screening device for a loader according to claim 4, characterized in that: 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 on 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).

6. 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).

7. A crushed stone screening device for a loader according to claim 6, 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).

8. The crushed stone screening device for a loader according to claim 7, 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).

9. A crushed stone screening device for a loader according to claim 8, 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).

10. The crushed stone screening device for a loader according to claim 1, characterized in that: 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).

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