A sand and gravel screening device

Abstract

The present application relates to a sand and gravel screening device, which belongs to the technical field of construction equipment. It includes a rotating shaft, a first spiral blade spirally fixedly provided on the circumferential side wall of the rotating shaft, a connecting pipe sleeved on one end of the rotating shaft, a feed box provided on one side of the connecting pipe, a first support fixedly provided between the feed box and the ground, the connecting pipe and the feed box are communicated with each other and are rotatably connected, one end of the rotating shaft close to the connecting pipe extends into the feed box, and the rotating shaft and the feed box are rotatably connected, the other end of the rotating shaft is sleeved with a first discharge pipe, a second support fixedly provided between the first discharge pipe and the ground, a first screen drum is connected between the connecting pipe and the first discharge pipe, a second screen drum is sleeved on the circumferential side of the first screen drum, a connecting plate is fixedly provided between one end of the second screen drum close to the connecting pipe and the first screen drum, a second spiral blade is spirally fixedly provided on the circumferential side wall of the first screen drum, and a drive assembly is provided on one side of the first screen drum. The present application has the effect of improving screening efficiency.

Description

Technical Field

[0001] The present application relates to the technical field of construction equipment, and in particular to a sand and gravel screening device. Background Art

[0002] Sand is generally divided into two categories: natural sand and artificial sand. Natural sand refers to rock particles with a particle size of less than 5mm formed by natural conditions. Sand coarseness refers to the average coarseness of a mixture of sand particles of different sizes, typically classified as coarse sand, medium sand, and fine sand. Sand particle gradation refers to the ratio of sand and gravel particles of different sizes. Sand and gravel of different particle sizes have different effects during use, so they should be classified and selected according to needs.

[0003] Most of the existing screening devices currently consist of a power system, a screen, a bracket and a transportation equipment. The power system drives the cylindrical screen to screen the sand and gravel in the screen. Normal-sized sand in the sand and gravel will leak out from the holes in the screen, while larger stones will remain in the screen and will be transported away by the transportation equipment and accumulated in other locations.

[0004] With respect to the above-mentioned related technologies, the inventors believe that most of the currently available screening devices can only screen out sand and gravel of one size at a time and are unable to perform graded screening, thus having the defect of low screening efficiency. Summary of the Invention

[0005] In order to improve screening efficiency, the present application provides a sand and gravel screening device.

[0006] The sand and gravel screening device provided in this application adopts the following technical solution:

[0007] The cam is secured to the side of the carrier's movement in such a way that the cam, having one end in contact with the carrier's movement, is secured to the side of the carrier's movement in such a way that the cam can move relative to the carrier's movement.

[0008] By adopting the above technical solution, the first sieve drum rotates to move the sand and gravel inside it, thereby throwing some of the sand and gravel from the sieve holes of the first sieve drum into the second sieve drum through centrifugal force. The sand and gravel that cannot pass through the sieve holes of the first sieve drum is transported out through the first discharge pipe by the first spiral blade. The second sieve drum rotates to throw some of the sand and gravel from the sieve holes of the second sieve drum to the outside through centrifugal force. The sand and gravel that cannot pass through the sieve holes of the second sieve drum is transported out of the second sieve drum through the second spiral blade. Through the above structure, the sand and gravel are divided into three sizes, achieving multi-stage screening and improving screening efficiency.

[0009] Optionally, the drive assembly includes a dual-axis motor, a drive roller and a first transmission belt, the dual-axis motor is installed on the side of the feed box away from the connecting pipe, one output shaft of the dual-axis motor is fixedly connected to the rotating shaft, the other output shaft of the dual-axis motor is fixedly connected to the first transmission wheel, the drive roller passes through the first support and the two are rotatably connected, the end of the drive roller close to the dual-axis motor is fixedly connected to the second transmission wheel, the first transmission belt passes around the first transmission wheel and the second transmission wheel, the end of the drive roller close to the connecting pipe is fixedly connected to the first gear, and the circumferential side wall of the connecting pipe is fixedly provided with a second gear meshing with the first gear.

[0010] By adopting the above technical solution, the dual-axis motor rotates the first spiral blade through the rotating shaft. The rotation of the first spiral blade pushes the sand and gravel in the first screen drum that cannot pass through the sieve holes of the first screen drum to move toward the first discharge pipe, so that the first spiral blade pushes the sand and gravel from the first discharge pipe to the outside; at the same time, the dual-axis motor drives the second transmission wheel to rotate the driving roller through the first transmission wheel, and the driving roller drives the connecting pipe to rotate through the first gear, thereby rotating the first screen drum and the second screen drum.

[0011] Optionally, guide plates are obliquely provided on both sides of the second screen drum, the two guide plates are close to each other on one side close to the ground, and a third support is fixed between the side wall of the guide plate facing away from the second screen drum and the ground.

[0012] By adopting the above technical solution, the sand and gravel thrown out by the second screen drum falls onto the surface of the guide plate, and slides along the inclined direction of the guide plate, thereby achieving the effect of gathering the sand and gravel thrown out by the second screen drum.

[0013] Optionally, a first support plate is provided above the second screen drum in the horizontal direction, a roller is rotatably connected in the first support plate, both ends of the roller pass through the first support plate, a transmission assembly that drives the roller to rotate is provided between the roller and the dual-axis motor, one end of the first support plate away from the roller extends above the dual-axis motor, a second support plate is fixedly provided on the side wall of the feed box away from the connecting pipe, a reinforcement plate is fixedly provided between the first support plate and the second support plate, a turntable is provided on the side of the first support plate away from the second screen drum, the turntable and the roller are fixedly connected, and the first support plate and the second screen drum are connected. A guide rod is arranged horizontally between the two guide rods, support rods are fixed at both ends of the guide rod, and both ends of the support rod are fixedly connected to the two material guide plates. A linkage rod is arranged vertically between the two support rods, and the guide rod passes through the bottom of the linkage rod and the two are slidably connected along the horizontal direction. A trigger rod is arranged between the top of the guide rod and the turntable, and both ends of the trigger rod are hinged to the linkage rod and the turntable respectively, and the hinge point of the trigger rod and the turntable is not located at the center of the turntable. A linkage disk is fixed on the circumferential side wall of the second screen drum, and the side of the linkage rod away from the trigger rod is connected to the trigger disk.

[0014] By adopting the above technical solution, the transmission assembly rotates the roller, and the roller causes the trigger rod to drive the linkage rod to slide back and forth along the guide rod through the turntable, so that the guide rod causes the first screen drum and the second screen drum to swing back and forth in the horizontal direction through the linkage plate, thereby making it difficult for sand and gravel to be blocked in the sieve holes of the first screen drum and the second screen drum.

[0015] Optionally, the transmission assembly includes a transmission roller and a second transmission belt, the transmission roller is arranged in a vertical direction on the side of the feed box away from the connecting pipe, the transmission roller passes through the first support plate and the second support plate, and the first support plate and the second support plate are rotatably connected to the transmission roller, the output shaft of the dual-axis motor away from the feed box is fixedly connected to a third bevel gear, the end of the transmission roller close to the second support plate is fixedly connected to a fourth bevel gear meshing with the third bevel gear, the end of the transmission roller close to the first support plate is fixedly provided with a third transmission wheel, the circumferential side wall of the rotating roller is fixedly provided with a fourth transmission wheel, and the second transmission belt passes around the third transmission wheel and the fourth transmission wheel.

[0016] By adopting the above technical solution, the dual-axis motor rotates the transmission roller through the third bevel gear and the fourth bevel gear, and the transmission roller drives the second transmission belt to rotate the roller through the third transmission wheel, thereby achieving the effect of the dual-axis motor driving the roller to rotate.

[0017] Optionally, a sliding rod is fixedly provided on the side wall of the linkage rod facing the linkage disk, and a limit block is fixedly provided on the end of the slide rod away from the linkage rod, the diameter of the limit block is larger than the diameter of the slide rod, and a sliding groove is provided in a ring shape on the side wall of the linkage disk facing the linkage rod, which is adapted for the sliding of the slide rod, and a limiting groove is provided in the linkage disk which is adapted for the sliding of the limit block, and the limiting groove is connected to the sliding groove.

[0018] By adopting the above technical solution, the rotation of the second screen drum causes the linkage disk to rotate, and the linkage disk causes the limit block to slide along the limit slot. When the linkage rod reciprocates, the linkage disk reciprocates through the slide rod and the limit block, thereby causing the first and second screen drums to reciprocate. Through the above structure, the linkage rod drives the linkage disk to reciprocate and the two are connected in a rotational manner.

[0019] Optionally, a first sliding cavity is formed in an annular shape on the outer wall of the connecting tube, and a first sliding block that is slidably adapted to the first sliding cavity is fixed in an annular shape on the inner wall of the first screen drum. A plurality of first limiting rods are connected to the first sliding block for sliding in a horizontal direction, and the plurality of first limiting rods are arranged around the central axis of the first screen drum. Both ends of the first limiting rods are fixedly connected to the inner wall of the connecting tube at the first sliding cavity.

[0020] By adopting the above technical solution, the connecting pipe rotates through the first limiting rod to rotate the first screen drum; when the first screen drum reciprocates, the first screen drum causes the first slider to slide along the first limiting rod. Through the above structure, the connecting pipe drives the first screen drum to rotate and the sliding connection between the two is achieved.

[0021] Optionally, a second sliding cavity is provided in an annular shape on the outer wall of the first discharge pipe, a second slider is slidably connected in the second sliding cavity, the second slider is sleeved on the circumferential side wall of the first discharge pipe, a plurality of second limiting rods are slidably connected in the second slider in the horizontal direction, the plurality of second limiting rods are arranged around the central axis of the first screen drum, both ends of the second limiting rods are fixedly connected to the inner wall of the first discharge pipe at the second sliding cavity, the first screen drum is ball-hinged with a first ball on the inner wall facing the second slider, and the side wall of the second slider facing away from the first discharge pipe is provided with a first rolling groove adapted for the rolling of the first ball.

[0022] By adopting the above technical solution, the first screen drum rotates, causing the first ball bearings to roll along the first rolling groove. When the first screen drum reciprocates, the first screen drum, through the first ball bearings, causes the second slider to slide along the second limiting rod. This structure achieves both a rotational connection and a sliding connection between the first screen drum and the first discharge pipe.

[0023] Optionally, a feeding pipe is sleeved on one end of the first discharge pipe close to the first screen drum, the feeding pipe is fixedly connected to the first screen drum, a third spiral blade is spirally fixed on the circumferential side wall of the feeding pipe, a second discharge pipe is sleeved on the circumferential side of the feeding pipe, a fourth support is fixed between the second discharge pipe and the ground, and the second discharge pipe is connected to the second screen drum.

[0024] By adopting the above technical solution, the rotation of the first screen drum causes the feed pipe to rotate, and the feed pipe causes the third spiral blade to rotate, thereby extending the discharge distance of the second screen drum; the fourth support supports the end of the second screen drum through the second discharge pipe, thereby achieving the effect of improving the stability of the second screen drum during rotation.

[0025] Optionally, a third sliding cavity is provided in an annular shape on the outer wall of the second discharge pipe, a third slider is slidably connected in the third sliding cavity, the third slider is sleeved on the circumferential side wall of the second discharge pipe, a plurality of third limiting rods are slidably connected in the third slider in a horizontal direction, the plurality of third limiting rods are arranged around the central axis of the second screen drum, both ends of the third limiting rods are fixedly connected to the inner wall of the second discharge pipe at the third sliding cavity, the second screen drum is ball-hinged with a second ball on the inner wall facing the third slider, and the side wall of the third slider facing away from the second discharge pipe is provided with a second rolling groove adapted for the rolling of the second ball.

[0026] By adopting this technical solution, the second screen drum rotates, causing the second ball bearings to roll along the second rolling grooves. As the second screen drum reciprocates, the second screen drum, through the second ball bearings, causes the third slider to slide along the third limiting rod. This structure achieves both a rotational and sliding connection between the second screen drum and the second discharge pipe. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 This is a structural diagram of a sand and gravel screening device according to an embodiment of the present application;

[0028] Figure 2 This is a partial cross-sectional view of an embodiment of the present application showing the movement of the rotating shaft, the first screen drum and the second screen drum;

[0029] Figure 3 This is a partial cross-sectional view of an embodiment of the present application showing the connection between the first screen drum and the connecting pipe;

[0030] Figure 4 This is a partial cross-sectional view of an embodiment of the present application showing the connection between the linkage rod and the linkage disk;

[0031] Figure 5 This is a partial cross-sectional view of an embodiment of the present application, showing the connection between the second screen drum and the second discharge pipe, and the first screen drum and the first discharge pipe.

[0032] In the figure, 1, rotating shaft; 11, first spiral blade; 2, feed box; 21, connecting pipe; 211, second gear; 212, first slide cavity; 23, first support; 24, second support plate; 241, reinforcing plate; 25, mounting seat; 3, first discharge pipe; 31, second support; 32, second slide cavity; 321, second slider; 3211, second limiting rod; 3212, first rolling groove; 4, first screen cylinder; 41, first screen hole; 42, second screen cylinder; 421, second screen hole; 422, linkage disk; 4221, slide groove; 4222, limiting groove; 423, second ball; 424, second spiral blade; 43, connecting disk; 44, first slider; 441, first limiting rod; 45, first ball; 46, feeding pipe; 461, third spiral blade : Piece; 5. Driving assembly; 51. Dual-axis motor; 511. First transmission wheel; 512. Third bevel gear; 52. Driving roller; 521. Second transmission wheel; 522. First gear; 53. First transmission belt; 6. Guide plate; 61. Third support; 62. Support rod; 621. Guide rod; 63. Linkage rod; 631. Slide rod; 6311. Limit block; 7. First support plate; 71. Roller; 711. Turntable; 7111. Trigger rod; 712. Fourth transmission wheel; 8. Transmission assembly; 81. Drive roller; 811. Fourth bevel gear; 812. Third transmission wheel; 82. Second transmission belt; 9. Second discharge pipe; 91. Fourth support; 92. Third slide cavity; 921. Third slider; 9211. Third limit rod; 9212. Second rolling groove. DETAILED DESCRIPTION

[0033] The following is combined with Figure 1-5 This application is described in further detail.

[0034] The embodiment of the present application discloses a sand and gravel screening device.

[0035] refer to Figure 1 and Figure 2 A sand and gravel screening device includes a feed box 2, a first support 23 is fixedly provided between the feed box 2 and the ground, a second screen drum 42 is provided on one side of the feed box 2, the second screen drum 42 is arranged in the horizontal direction, a plurality of second sieve holes 421 are penetrated through the outer wall of the second screen drum 42, the end of the second screen drum 42 away from the feed box 2 is connected to the second discharge pipe 9, and a fourth support 91 is fixedly provided between the second discharge pipe 9 and the ground. Guide plates 6 are inclinedly provided on both sides of the second screen drum 42, and the bottom sides of the two guide plates 6 are close to each other. A third support 61 is fixedly provided between the two guide plates 6 facing away from the ground, and a first screen drum 4 is provided in the horizontal direction inside the second screen drum 42, and a plurality of first sieve holes 41 are penetrated through the outer wall of the first screen drum 4, and the end of the first screen drum 4 away from the feed box 2 is connected to the first discharge pipe 3, and a second support 31 is fixedly provided between the first discharge pipe 3 and the ground.

[0036] The staff transports the sand and gravel to be screened into the feed box 2 through a conveyor belt, and the sand and gravel in the feed box 2 enters the first sieve drum 4; the first sieve drum 4 rotates, and the sand and gravel smaller than the aperture of the first sieve hole 41 passes through the first sieve hole 41 and enters the second sieve drum 42, and the sand and gravel that does not pass through the first sieve hole 41 is transported to the outside from the first discharge pipe 3; the second sieve drum 42 rotates, and the sand and gravel smaller than the aperture of the second sieve hole 421 passes through the second sieve hole 421 and is thrown to the outside, and the sand and gravel thrown to the outside falls on the surface of the guide plate 6, and then slides along the inclined direction of the guide plate 6, and the sand and gravel that does not pass through the second sieve hole 421 is transported to the outside from the second discharge pipe 9.

[0037] refer to Figure 2 A connecting plate 43 is fixedly provided between the first sieve drum 4 and the second sieve drum 42. The connecting plate 43 is arranged at the ends of the first sieve drum 4 and the second sieve drum 42 close to the feed box 2. A second spiral blade 424 is provided between the first sieve drum 4 and the second sieve drum 42. The second spiral blade 424 is spirally sleeved on the circumferential side wall of the first sieve drum 4, and the second spiral blade 424 is fixedly connected to the outer wall of the first sieve drum 4.

[0038] refer to Figure 2 A connecting pipe 21 is arranged horizontally between the feed box 2 and the first screen drum 4. The end of the connecting pipe 21 away from the first screen drum 4 is rotatably connected to the feed box 2, and the connecting pipe 21 is communicated with the feed box 2. The end of the connecting pipe 21 away from the feed box 2 extends into the first screen drum 4.

[0039] refer to Figure 2 and Figure 3 A first sliding cavity 212 is provided in an annular manner on the outer wall of the connecting pipe 21. The first sliding cavity 212 is provided at one end of the connecting block close to the first screen drum 4. A first sliding block 44 is fixed in an annular manner on the inner wall of the first screen drum 4 and is slidably adapted to the first sliding cavity 212. A plurality of first limiting rods 441 are connected to the first sliding block 44 in a horizontal sliding direction. The plurality of first limiting rods 441 are arranged around the central axis of the connecting pipe 21. Both ends of the first limiting rod 441 are fixedly connected to the inner wall of the connecting pipe 21 at the first sliding cavity 212.

[0040] refer to Figure 1 and Figure 2 A rotating shaft 1 is arranged horizontally in the connecting pipe 21, one end of the rotating shaft 1 extends into the feed box 2 and is rotatably connected to the inner wall of the feed box 2, and the other end of the rotating shaft 1 extends into the first discharge pipe 3, and a first spiral blade 11 is fixed to the circumferential side wall of the rotating shaft 1.

[0041] The rotation of the rotating shaft 1 drives the first spiral blade 11, which then transports sand and gravel from the feed box 2 into the first sieve drum 4. The first spiral blade 11 then transports sand and gravel that have not passed through the first sieve holes 41 in the first sieve drum 4 into the first discharge pipe 3. Finally, the first spiral blade 11 transports the sand and gravel in the first discharge pipe 3 to the outside. The connected rotation drives the first sieve drum 4 to rotate via the first limiting rod 441, which in turn drives the second sieve drum 42 to rotate via the connecting plate 43. Simultaneously, the rotation of the first sieve drum 4 drives the second spiral blade 424 to rotate, transporting sand and gravel that have not passed through the second sieve holes 421 in the first and second sieve drums 42 into the second feed pipe. When the second sieve drum 42 reciprocates horizontally, the second sieve drum 42 causes the first sieve drum 4 to reciprocate horizontally via the connecting plate 43, causing the first sieve drum 4 to drive the first slider 44 to slide along the first limiting rod 441.

[0042] refer to Figure 2 A driving assembly 5 is provided on the side of the first screen drum 4 facing the first support 23, and the driving assembly 5 includes a dual-axis motor 51. A mounting seat 25 is fixedly provided on the side wall of the feed box 2 facing away from the connecting pipe 21. The dual-axis motor 51 is installed on the surface of the mounting seat 25 facing away from the ground. One output shaft of the dual-axis motor 51 passes through the feed box 2 and is fixedly connected to the rotating shaft 1, and the other output shaft of the dual-axis motor 51 is fixedly connected to the first transmission wheel 511.

[0043] refer to Figure 2 The driving assembly 5 also includes a driving roller 52 and a first transmission belt 53. The driving roller 52 passes through the first support 23 in the horizontal direction and is rotatably connected thereto. The end of the driving roller 52 close to the dual-axis motor 51 is fixedly connected to the second transmission wheel 521. The first transmission belt 53 passes around the first transmission wheel 511 and the second transmission wheel 521. The end of the driving roller 52 close to the connecting tube 21 is fixedly connected to the first gear 522. The circumferential side wall of the connecting tube 21 is fixedly provided with a second gear 211 meshing with the first gear 522.

[0044] The dual-axis motor 51 starts to drive the rotating shaft 1 to rotate. At the same time, the dual-axis motor 51 starts to drive the first transmission wheel 511 to rotate. The first transmission wheel 511 drives the second transmission wheel 521 through the first transmission belt 53. The second transmission wheel 521 drives the driving roller 52 to rotate. The driving roller 52 drives the first gear 522 to rotate. The first gear 522 drives the second gear 211 to rotate. The second gear 211 drives the connecting pipe 21 to rotate.

[0045] refer to Figure 2A first support plate 7 is arranged horizontally above the second screen drum 42, and one end of the first support plate 7 away from the second screen drum 42 extends to the top of the dual-axis motor 51. A second support plate 24 is fixedly provided in the horizontal direction on the side wall of the feed box 2 away from the connecting pipe 21, and a reinforcement plate 241 is provided in the vertical direction on the side of the feed box 2 away from the connecting pipe 21. The reinforcement plate 241 is fixed between the first support plate 7 and the second support plate 24.

[0046] refer to Figure 2 A roller 71 is rotatably connected inside the first support plate 7. The roller 71 is arranged at one end of the first support plate 7 away from the feed box 2, and both ends of the roller 71 pass through the first support plate 7. A fourth transmission wheel 712 is fixed to the circumferential side wall of the roller 71.

[0047] refer to Figure 2 A transmission assembly 8 is provided on the peripheral side of the feed box 2, and the transmission assembly 8 includes a transmission roller 81 and a second transmission belt 82. The transmission roller 81 is arranged on the side of the feed box 2 away from the connecting pipe 21 in the vertical direction. The transmission roller 81 passes through the first support plate 7 and the second support plate 24, and the first support plate 7 and the second support plate 24 are both rotatably connected to the transmission roller 81. A third transmission wheel 812 is fixedly provided at one end of the transmission roller 81 close to the first support plate 7, and the second transmission belt 82 passes around the third transmission wheel 812 and the fourth transmission wheel 712.

[0048] refer to Figure 2 The output shaft of the dual-axis motor 51 away from the feed box 2 is fixedly connected to the third bevel gear 512, and the end of the transmission roller 81 close to the second support plate 24 is fixedly connected to the fourth bevel gear 811 meshing with the third bevel gear 512.

[0049] The dual-axis motor 51 starts to drive the third bevel gear 512 to rotate, the third bevel gear 512 drives the fourth bevel gear 811 to rotate, the fourth bevel gear 811 drives the transmission roller 81 to rotate, the transmission roller 81 drives the third transmission wheel 812 to rotate, the third transmission wheel 812 drives the fourth transmission wheel 712 to rotate through the second transmission belt 82, and the fourth transmission wheel 712 drives the rotating roller 71 to rotate.

[0050] refer to Figure 1 and Figure 2 A turntable 711 is provided horizontally on the side of the third transmission wheel 812 facing away from the first support plate 7. The turntable 711 is fixedly connected to the roller 71. A trigger rod 7111 is hinged on the surface of the turntable 711 facing away from the third transmission wheel 812, and the hinge point between the trigger rod 7111 and the turntable 711 is not located at the center of the turntable 711. The end of the trigger rod 7111 away from the turntable 711 is hinged with a linkage rod 63. The linkage rod 63 is provided in the vertical direction, and the bottom end of the linkage rod 63 away from the trigger rod 7111 extends into between the two material guide plates 6.

[0051] refer to Figure 1 Two support rods 62 are fixed between the two guide plates 6. Both support rods 62 are arranged in the horizontal direction. A guide rod 621 is fixed between the two support rods 62 in the horizontal direction. The guide rod 621 passes through the linkage rod 63 and extends into the bottom end between the two guide plates 6, and the guide rod 621 and the linkage rod 63 are slidably connected in the horizontal direction.

[0052] The rotation of the roller 71 drives the rotary disk 711 to rotate, the rotary disk 711 drives the trigger rod 7111 to move, and the trigger rod 7111 drives the linkage rod 63 to slide back and forth along the guide rod 621.

[0053] refer to Figure 4 A linkage disk 422 is fixedly provided on the circumferential side wall of the second screen drum 42, and a sliding rod 631 is fixedly provided on the side wall of the linkage rod 63 facing the linkage disk 422. A sliding groove 4221 that slides with the sliding rod 631 is annularly opened on the side wall of the linkage disk 422 facing the linkage rod 63, and a limit block 6311 is fixedly provided at the end of the sliding rod 63 away from the linkage rod 63. The limit block 6311 is hemispherical, and the diameter of the limit block 6311 is larger than the diameter of the sliding rod 631. A limit groove 4222 that slides with the limit block 6311 is opened in the linkage disk 422, and the limit groove 4222 is connected to the slide groove 4221.

[0054] The reciprocating motion of the linkage rod 63 drives the linkage disc 422 to rock back and forth through the slide rod 631 and the limit block 6311. The linkage disc 422 then drives the second sieve drum 42 to rock back and forth. When the second sieve drum 42 rotates, the second sieve drum 42 drives the linkage disc 422 to rotate. The rotation of the linkage disc 422 causes the limit block 6311 to slide along the limit slot 4222. Simultaneously, the linkage disc 422 causes the slide rod 631 to slide along the slide slot 4221.

[0055] refer to Figure 1 and Figure 5 The second discharge pipe 9 is horizontally sleeved on one end of the first discharge pipe 3 close to the first screen drum 4. The second discharge pipe 9 is arranged in the horizontal direction, and the end of the second discharge pipe 9 close to the first screen drum 4 extends into the second screen drum 42. A third sliding cavity 92 is annularly opened on the outer wall of the second discharge pipe 9. A third slider 921 is slidably connected in the third sliding cavity 92. The third slider 921 is sleeved on the circumferential side wall of the second discharge pipe 9. A plurality of second balls 423 are ball-hinged on the inner wall of the second sieve drum 42 facing the third slider 921. The side wall of the third slider 921 facing away from the second discharge pipe 9 is annularly opened with a second rolling groove 9212 that is adapted for rolling with the second balls 423.

[0056] refer to Figure 5A plurality of third limiting rods 9211 are connected to the third slider 921 in a horizontal sliding direction. The plurality of third limiting rods 9211 are arranged around the central axis of the second screen drum 42. Both ends of the third limiting rods 9211 are fixedly connected to the inner wall of the second discharge pipe 9 at the third sliding cavity 92.

[0057] When the second sieve drum 42 rotates, the second sieve drum 42 drives the second ball 423 to roll along the second rolling groove 9212 ; when the second sieve drum 42 rocks back and forth, the second sieve drum 42 drives the third slider 921 to slide back and forth along the third limiting rod 9211 through the second ball 423 .

[0058] refer to Figure 5 A feed pipe 46 is provided between the first discharge pipe 3 and the second discharge pipe 9. The feed pipe 46 is sleeved on the circumferential side wall of the first discharge pipe 3. One end of the feed pipe 46 close to the second screen drum 42 is fixedly connected to the first screen drum 4. A third spiral blade 461 is spirally fixed on the circumferential side wall of the feed pipe 46.

[0059] The rotation of the first screen drum 4 drives the feeding pipe 46 to rotate, and the rotation of the feeding pipe 46 drives the third spiral blade 461 to rotate. The rotation of the third spiral blade 461 transports the sand and gravel in the second discharge pipe 9 to the outside.

[0060] refer to Figure 5 A second sliding cavity 32 is provided in an annular manner on the outer wall of the first discharge pipe 3. The second sliding cavity 32 is provided at one end of the first discharge pipe 3 close to the first screen drum 4. A second slider 321 is slidably connected in the second sliding cavity 32. The second slider 321 is sleeved on the circumferential side wall of the first discharge pipe 3. A plurality of first balls 45 are ball-hinged on the inner wall of the first screen drum 4 facing the second slider 321. A first rolling groove 3212 that is adapted for rolling with the first ball 45 is provided in an annular manner on the side wall of the second slider 321 facing away from the first discharge pipe 3.

[0061] refer to Figure 5 A plurality of second limiting rods 3211 are connected to the second slider 321 in a horizontal sliding direction. The plurality of second limiting rods 3211 are arranged around the central axis of the first screen drum 4. Both ends of the second limiting rods 3211 are fixedly connected to the inner wall of the first discharge pipe 3 at the second sliding cavity 32.

[0062] When the first screen drum 4 rotates, the first screen drum 4 drives the first ball 45 to roll along the first rolling groove 3212 . When the first screen mesh swings back and forth, the first screen drum 4 drives the second slider 321 to slide back and forth along the second limit block 6311 through the first ball 45 .

[0063] The implementation principle of a sand and gravel screening device according to an embodiment of the present application is as follows: a worker transports the sand and gravel to be screened into a feed box via a conveyor belt, the first spiral blade 11 transports the sand and gravel into the first screen drum 4, the first screen drum 4 rotates to throw the sand and gravel that can pass through the first screen hole 41 into the second screen drum 42, and the sand and gravel that does not pass through the first screen hole 41 is transported to the outside by the first spiral blade 11 through the first discharge pipe 3; the second screen drum 42 rotates to throw the sand and gravel that can pass through the second screen hole 421 out to the outside, and the sand and gravel that does not pass through the second screen hole 421 is transported to the second discharge pipe 9 by the second spiral blade 424, and then transported to the outside by the third spiral blade 461. Through the above structure, the effect of improving screening efficiency is achieved.

[0064] The embodiments of this specific implementation method are all preferred embodiments of the present application and are not intended to limit the scope of protection of the present application. Therefore, any equivalent changes made based on the structure, shape, and principle of the present application should be included in the scope of protection of the present application.

Claims

1. A sand and gravel screening device, characterized in that: The invention comprises a rotating shaft (1), the rotating shaft (1) is arranged in a horizontal direction, a first spiral blade (11) is spirally fixed on the circumferential side wall of the rotating shaft (1), one end of the rotating shaft (1) is sleeved with a connecting pipe (21), a feed box (2) is arranged on one side of the connecting pipe (21), a first support (23) is fixed between the feed box (2) and the ground, the connecting pipe (21) is connected to the feed box (2) and the two are rotatably connected, one end of the rotating shaft (1) close to the connecting pipe (21) extends into the feed box (2), and the rotating shaft (1) and the feed box (2) are rotatably connected, and the other end of the rotating shaft (1) is sleeved with a first discharge The invention relates to a pipe (3), a second support (31) is fixedly provided between the first discharge pipe (3) and the ground, a first screen drum (4) is connected between the connecting pipe (21) and the first discharge pipe (3), a second screen drum (42) is sleeved on the circumferential side of the first screen drum (4), a connecting plate (43) is fixedly provided between the end of the second screen drum (42) close to the connecting pipe (21) and the first screen drum (4), a second spiral blade (424) is spirally fixedly provided on the circumferential side wall of the first screen drum (4), and a driving assembly (5) for driving the rotating shaft (1) and the connecting pipe (21) to rotate is provided on the side of the first screen drum (4) facing the first support (23); The driving assembly (5) comprises a double-shaft motor (51), a driving roller (52) and a first transmission belt (53), wherein the double-shaft motor (51) is installed on a side of the feed box (2) away from the connecting pipe (21), an output shaft of the double-shaft motor (51) is fixedly connected to the rotating shaft (1), and the other output shaft of the double-shaft motor (51) is fixedly connected to the first transmission wheel (511), the driving roller (52) passes through the first support (23) and the two are rotatably connected, an end of the driving roller (52) close to the double-shaft motor (51) is fixedly connected to the second transmission wheel (521), the first transmission belt (53) passes around the first transmission wheel (511) and the second transmission wheel (521), an end of the driving roller (52) close to the connecting pipe (21) is fixedly connected to the first gear (522), and a second gear (211) meshing with the first gear (522) is fixedly provided on the circumferential side wall of the connecting pipe (21); Guide plates (6) are obliquely provided on both sides of the second screen drum (42), the two guide plates (6) are close to each other on the sides close to the ground, and a third support (61) is fixed between the side wall of the guide plate (6) facing away from the second screen drum (42) and the ground; A first support plate (7) is provided above the second screen drum (42) in the horizontal direction. A roller (71) is rotatably connected in the first support plate (7). Both ends of the roller (71) pass through the first support plate (7). A transmission assembly (8) for driving the roller (71) to rotate is provided between the roller (71) and the double-axis motor (51). One end of the first support plate (7) away from the roller (71) extends above the double-axis motor (51). A second support plate (24) is fixedly provided on the side wall of the feed box (2) away from the connecting pipe (21). A reinforcement plate (241) is fixedly provided between the first support plate (7) and the second support plate (24). A turntable (711) is provided on the side of the first support plate (7) away from the second screen drum (42). The turntable (711) is fixedly connected to the roller (71). The first support plate (7) and the second screen drum (42) are connected in the horizontal direction. A guide rod (621) is provided in the direction, support rods (62) are fixedly provided at both ends of the guide rod (62), and both ends of the support rod (62) are fixedly connected to the two guide plates (6), a linkage rod (63) is provided between the two support rods (62) in the vertical direction, the guide rod (621) passes through the bottom of the linkage rod (63) and the two are slidably connected in the horizontal direction, a trigger rod (7111) is provided between the top end of the guide rod (621) and the turntable (711), and the two ends of the trigger rod (7111) are hinged to the linkage rod (63) and the turntable (711), and the hinge point between the trigger rod (7111) and the turntable (711) is not located at the center of the turntable (711), a linkage disk (422) is fixedly provided on the circumferential side wall of the second screen drum (42), and the side of the linkage rod (63) away from the trigger rod (7111) is connected to the trigger disk; The linkage rod (63) is fixedly provided with a sliding rod (631) on the side wall facing the linkage disk (422); a limit block (6311) is fixedly provided on the end of the slide rod (631) away from the linkage rod (63); the diameter of the limit block (6311) is larger than the diameter of the slide rod (631); a sliding groove (4221) is provided in an annular manner on the side wall facing the linkage rod (63) for slidingly matching the slide rod (631); a limiting groove (4222) is provided in the linkage disk (422) for slidingly matching the limiting block (6311); and the limiting groove (4222) is communicated with the sliding groove (4221).

2. A sand and gravel screening device according to claim 1, characterized in that: The transmission assembly (8) comprises a transmission roller (81) and a second transmission belt (82), the transmission roller (81) being arranged on a side of the feed box (2) away from the connecting pipe (21) in a vertical direction, the transmission roller (81) passing through the first support plate (7) and the second support plate (24), and the first support plate (7) and the second support plate (24) are both rotatably connected to the transmission roller (81), the output shaft of the dual-axis motor (51) away from the feed box (2) is fixedly connected to the third bevel gear (512), one end of the transmission roller (81) close to the second support plate (24) is fixedly connected to the fourth bevel gear (811) meshed with the third bevel gear (512), one end of the transmission roller (81) close to the first support plate (7) is fixedly provided with a third transmission wheel (812), a circumferential side wall of the rotating roller (71) is fixedly provided with a fourth transmission wheel (712), and the second transmission belt (82) passes around the third transmission wheel (812) and the fourth transmission wheel (712).

3. The sand and gravel screening device according to claim 1, characterized in that: The outer wall of the connecting tube (21) is provided with a first sliding cavity (212) in an annular shape, and the inner wall of the first screen drum (4) is provided with a first sliding block (44) which is slidably adapted to the first sliding cavity (212). A plurality of first limiting rods (441) are slidably connected in the horizontal direction in the first sliding block (44). The plurality of first limiting rods (441) are arranged around the central axis of the first screen drum (4), and both ends of the first limiting rods (441) are fixedly connected to the inner wall of the connecting tube (21) at the first sliding cavity (212).

4. The sand and gravel screening device according to claim 1, characterized in that: The outer wall of the first discharge pipe (3) is provided with a second sliding cavity (32) in an annular manner, and a second slider (321) is slidably connected in the second sliding cavity (32). The second slider (321) is sleeved on the circumferential side wall of the first discharge pipe (3), and a plurality of second limiting rods (3211) are slidably connected in the second slider (321) in the horizontal direction. The plurality of second limiting rods (3211) are arranged around the central axis of the first screen drum (4), and both ends of the second limiting rods (3211) are fixedly connected to the inner wall of the first discharge pipe (3) at the second sliding cavity (32). The first screen drum (4) is spherically hinged with a first ball (45) on the inner wall facing the second slider (321), and the side wall of the second slider (321) facing away from the first discharge pipe (3) is provided with a first rolling groove (3212) that is rolling-adapted to the first ball (45).

5. The sand and gravel screening device according to claim 1, characterized in that: A feeding pipe (46) is sleeved on one end of the first discharge pipe (3) close to the first screen drum (4), the feeding pipe (46) and the first screen drum (4) are fixedly connected, a third spiral blade (461) is spirally fixed on the circumferential side wall of the feeding pipe (46), a second discharge pipe (9) is sleeved on the circumferential side of the feeding pipe (46), a fourth support (91) is fixed between the second discharge pipe (9) and the ground, and the second discharge pipe (9) is connected to the second screen drum (42).

6. The sand and gravel screening device according to claim 5, characterized in that: The outer wall of the second discharge pipe (9) is provided with a third sliding cavity (92) in an annular manner, and a third slider (921) is slidably connected in the third sliding cavity (92). The third slider (921) is sleeved on the circumferential side wall of the second discharge pipe (9), and a plurality of third limiting rods (9211) are slidably connected in the third slider (921) in the horizontal direction. The plurality of third limiting rods (9211) are arranged around the central axis of the second screen drum (42), and both ends of the third limiting rod (9211) are fixedly connected to the inner wall of the second discharge pipe (9) at the third sliding cavity (92). The second screen drum (42) is spherically hinged with a second ball (423) on the inner wall facing the third slider (921), and the side wall of the third slider (921) facing away from the second discharge pipe (9) is provided with a second rolling groove (9212) that is rolling-adapted to the second ball (423).

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