CN214391066U - Gravel multistage screening equipment for concrete - Google Patents

Abstract

The utility model discloses a multistage screening installation of gravel for concrete, including pillar and first shell, be located the right side the top of pillar and the bottom right side fixed connection of first shell, the left end of first support and the outer wall right side fixed connection of first shell, the left and right sides of horizontal pole is rotated through the inner wall left and right sides of bearing with first shell respectively and is connected, the outer wall of horizontal pole and rotating vane's inner wall fixed connection, hot plate fixed connection is at the inner wall of first shell. The drying of the materials is realized, and the screening accuracy in the later period is increased. This multistage screening installation of gravel for concrete passes through the cooperation between first motor, rotating vane and the horizontal pole, and first motor drives the horizontal pole and rotating vane is rotatory, and the function of drying is realized through the heating to the hot plate, prevents that gravel, grit and silt from mixing together, has improved the accuracy of later stage screening, has improved work efficiency, has reached anticipated work effect.

Description

Gravel multistage screening equipment for concrete

Technical Field

The utility model relates to a gravel multistage screening installation technical field for the concrete specifically is a gravel multistage screening installation for concrete.

Background

Gravel refers to a mixture of sand and gravel, small pebbles and boulders (a rock eroded by water or weather) are also called gravel, and among gravel, gravel and sludge, gravel is the largest, and has a diameter larger than 2mm, sand is the second, and has a diameter smaller than 2mm, and sludge is the third, and has a diameter smaller than one sixteenth millimeter, and the concrete is divided into gravel, gravel and sludge by a gravel multistage screening device.

For example, the application number "201720275336.8" is a concrete gravel multistage screening device, which comprises a screening box, a feed hopper, a mounting block, a chute, a first screen, a second screen and the like; screening roof portion intermediate junction has the feeder hopper, though the device passes through the kelly and fixes the second commentaries on classics board, the multistage screening of rethread first filter screen and second filter screen and third filter screen, carry out the layering with the grit, but the device is because there is not the drying process to the grit, lead to the grit, grit and silt are mixed together, the accuracy of later stage screening has been influenced, work efficiency is reduced, can not reach anticipated work effect, the device needs the artificial screening that realizes whole device of knocking, high labor strength, operator's burden has been increased, the artificial cost has been improved, the device material still stops on the screen cloth after the screening, inconvenient collection, can't satisfy modern people's work demand, the practicality has been reduced.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a gravel multistage screening installation for concrete to the stoving that does not have the gravel that proposes in solving above-mentioned background art leads to gravel, grit and silt to mix together, has influenced the accuracy of later stage screening, has reduced work efficiency, can not reach the problem of anticipated work effect.

In order to achieve the above object, the utility model provides a following technical scheme: the drying device comprises a support column and a first shell, wherein the top of the support column positioned on the right side is fixedly connected with the right side of the bottom of the first shell, and a drying device is arranged in the first shell;

the drying device comprises a first bracket, a first motor, a cross bar, a rotating blade and a heating plate;

the left end of first support and the outer wall right side fixed connection of first shell, the inside of first support and the outer wall fixed connection of first motor, the output of first motor and the right-hand member fixed connection of horizontal pole, the left and right sides of horizontal pole is rotated through the inner wall left and right sides of bearing and first shell respectively and is connected, the outer wall of horizontal pole and rotating vane's inner wall fixed connection, hot plate fixed connection is at the inner wall of first shell. The drying of the materials is realized, and the screening accuracy in the later period is increased.

Preferably, triangular blocks are distributed on the surface of the cross rod at equal intervals. The triangular blocks can separate materials which are adhered together, so that the drying is more convenient.

Preferably, a recovery device is arranged on the left side of the first shell;

the recovery device comprises a fan, a water tank, a rubber plug, a water pump and an annular pipe;

the bottom of fan and the left side top fixed connection of first shell, the input of fan is linked together with the top left side of first shell, the output of fan is linked together with the right side top of water tank, the inner wall top left side of water tank and the outer wall interference fit of rubber buffer, the bottom left side of water tank and the top fixed connection of left side pillar, the inner wall bottom left side of water tank and the bottom fixed connection of water pump, the output of water pump and the left end fixed connection of ring canal. The function of recovering the water vapor is realized, and the resource utilization rate is improved.

Preferably, the grommet is arranged in a wave shape. The contact area between the ring pipe and the water vapor is increased, and the working efficiency is improved.

Preferably, the left side of the bottom of the first shell is fixedly connected with a second shell, the bottom of the left side of the inner wall of the second shell is fixedly connected with a first baffle, and a primary screening device is arranged in the second shell;

the primary screening device comprises a vertical plate, an arc-shaped plate, a first long rod, a second long rod, a third long rod, a short plate, a second motor, a short rod, a fourth long rod and a screen;

the top end of the vertical plate is fixedly connected with the left side of the bottom of the first shell, the bottom end of the vertical plate is fixedly connected with the left side of the top of the arc plate, the inner wall of the arc plate is slidably clamped with the right side of the outer wall of the first long rod, the right side of the rear end face of the first long rod is rotatably connected with the bottom of the front face of the second long rod through a pin shaft, the top of the rear end face of the second long rod is rotatably connected with the top of the front face of the third long rod through a pin shaft, a bottom groove of the third long rod is slidably clamped with the right side of the short plate, the left side of the rear end face of the short plate is fixedly connected with the output end of a second motor, the rear end face of the second motor is fixedly connected with the back face of the inner wall of the second shell, the left side of the first long rod is rotatably connected with the right side of a fourth long rod through a pin shaft, the left side of the fourth long rod is fixedly connected with the left side of the top of the screen mesh, and the left and right ends of the screen mesh are fixedly connected with the inner sides of the two short rods, the outer walls of the two short rods penetrate through the left side and the right side of the second shell, and the outer walls of the two short rods are in clearance fit with the second shell. The primary screening of the materials is realized, the screening is not needed to be realized manually, and time and labor are saved.

Preferably, the arc plate and the first long rod constitute a sliding unit. The first long rod can slide left and right in the arc-shaped plate, so that the sliding is more stable.

Preferably, the bottom of the second shell is fixedly connected with a third shell, the right side of the inner wall of the third shell is fixedly connected with a second baffle, the right side of the bottom of the inner wall of the third shell is fixedly connected with a guide plate, and a secondary screening device is arranged inside the third shell;

the secondary screening device comprises a support, a long rod, a fourth shell, a spring, a short rod, a third motor, a T-shaped plate, an eccentric wheel, a rubber wheel and a transverse plate;

the bottom of the support is fixedly connected with the left side of the bottom of the inner wall of the third shell, a fourth shell is arranged inside the support, the left side and the right side of the fourth shell are fixedly connected with the inner sides of the four long rods respectively, the outer wall of the long rod penetrates through the outer wall of the support, the outer wall of the long rod is in clearance fit with the support, the outer wall of the long rod is sleeved with the inner wall of the spring, the left end and the right end of the spring are fixedly connected with the inner wall of the support and the outer wall of the fourth shell respectively, the upper side and the lower side of the inner wall of the fourth shell are fixedly connected with the upper end and the lower end of the four short rods, the inner sides of the four short rods are fixedly connected with the outer wall of the third motor, the output ends of the two third motors are rotatably connected with the left side and the right side of the bottom of the T-shaped plate respectively through bearings, the back surfaces of the two eccentric wheels are fixedly connected with the output ends of the third motor, and the top end of the T-shaped plate is fixedly connected with the left side of the bottom of the transverse plate, the left side and the right side of the top of the support are rotatably connected with the center of the rubber wheel through pin shafts, and the top of the rubber wheel is attached to the bottom of the transverse plate. The material can be screened for the second time, the material is collected in a centralized way, and the burden of an operator is reduced.

Preferably, the two eccentric wheels are in central symmetry with respect to the T-shaped plate. The movement direction of the eccentric wheel is consistent when the eccentric wheel rotates, and the rotation is more uniform.

Compared with the prior art, the beneficial effects of the utility model are that: compared with the prior art, the gravel multistage screening equipment for concrete has the following advantages:

through the cooperation between first motor, rotating vane and the horizontal pole, first motor drives the horizontal pole and rotating vane is rotatory, and the function of drying is realized through the heating to the hot plate, prevents that gravel, grit and silt from mixing together, has improved the accuracy of later stage screening, has improved work efficiency, has reached anticipated work effect.

Through the cooperation between second motor, third motor and the screen cloth, the screen cloth side-to-side motion is driven indirectly to the second motor, and the diaphragm side-to-side motion is driven indirectly to the third motor, does not need artificial vibrations to realize the screening, and low in labor strength has alleviateed operator's burden, has reduced artifical cost.

Through the cooperation between first baffle, second baffle and the guide plate, because primary screening device and secondary screening device have slight angle slope, the material under the screen flows through first baffle, second baffle and guide plate, has realized the centralized processing of material, and convenient the collection satisfies modern people's work demand, has improved the practicality.

Drawings

FIG. 1 is a schematic structural view of the present invention;

FIG. 2 is a schematic view of the connection structure of the first bracket, the first motor and the cross bar in FIG. 1;

FIG. 3 is a schematic view of the connection structure of the riser, the arc plate and the first long rod in FIG. 1;

fig. 4 is a schematic view of a connection relationship between the holder, the long rod and the fourth housing in fig. 1.

In the figure: 1. pillar, 2, first housing, 3, drying device, 301, first support, 302, first motor, 303, cross bar, 304, rotating blade, 305, heating plate, 4, recovery device, 401, fan, 402, water tank, 403, rubber plug, 404, water pump, 405, collar, 5, prescreening device, 501, riser, 502, arc plate, 503, first long rod, 504, second long rod, 505, third long rod, 506, short plate, 507, second motor, 508, short rod, 509, fourth long rod, 510, screen, 6, second housing, 7, secondary screening device, 701, support, 702, long rod, T-shaped plate, 708, eccentric wheel, 709, rubber wheel, 710, transverse plate, 8, first baffle, 9, third housing, 10, second baffle, 11, deflector.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.

Referring to fig. 1-4, the present invention provides a technical solution: comprises a pillar 1 and a first shell 2, the top of the pillar 1 on the right side is fixedly connected with the right side of the bottom of the first shell 2, a drying device 3 is arranged in the first shell 2, the drying device 3 comprises a first support 301, a first motor 302, a cross bar 303, a rotating blade 304 and a heating plate 305, the left end of the first support 301 is fixedly connected with the right side of the outer wall of the first shell 2, the model of the first motor 302 is Y2-0.75KW, the inside of the first support 301 is fixedly connected with the outer wall of the first motor 302, the output end of the first motor 302 is fixedly connected with the right end of the cross bar 303, the output end of the first motor 302 can drive the cross bar 303 to rotate together, the left side and the right side of the cross bar 303 are respectively rotatably connected with the left side and the right side of the inner wall of the first shell 2 through bearings, the cross bar 303 can rotate through the bearings, the outer wall of the cross bar 303 is fixedly connected with the inner wall of the rotating blade 304, the heating plate 305 is XKDR50-600, heating plate 305 is fixedly connected to the inner wall of first shell 2, triangular blocks are equidistantly distributed on the surface of cross bar 303, the triangular blocks can separate materials which are adhered together, and drying is facilitated, recovery device 4 is arranged on the left side of first shell 2, recovery device 4 comprises a fan 401, a water tank 402, a rubber plug 403, a water pump 404 and a ring pipe 405, the model of fan 401 is JXFZ3530-16, the bottom of fan 401 is fixedly connected with the top of the left side of first shell 2, the input end of fan 401 is communicated with the left side of the top of first shell 2, the output end of fan 401 is communicated with the top of the right side of water tank 402, the fan 401 sucks water vapor in first shell 2 into water tank 402, the left side of the top of the inner wall of water tank 402 is in interference fit with the outer wall of rubber plug 403, rubber plug 403 can be pulled out from the top of the inner wall of water tank 402, the left side of the bottom of water tank 402 is fixedly connected with the top of left strut 1, the model of the water pump 404 is KSL, the left side of the bottom of the inner wall of the water tank 402 is fixedly connected with the bottom of the water pump 404, the output end of the water pump 404 is fixedly connected with the left end of the ring pipe 405, the water pump 404 can repeatedly pump out the water in the ring pipe 405, the circulation is carried out, the temperature of the ring pipe 405 is reduced, the water vapor is liquefied into water and attached to the ring pipe, the ring pipe 405 is arranged in a wave shape, the contact area between the ring pipe and the water vapor is increased, the working efficiency is improved, the left side of the bottom of the first shell 2 is fixedly connected with a second shell 6, the bottom of the left side of the inner wall of the second shell 6 is fixedly connected with a first baffle plate 8, the first baffle plate 8 can block the screened materials to realize centralized treatment, a primary screening device 5 is arranged inside the second shell 6, the primary screening device 5 comprises a vertical plate 501, an arc plate 502, a first long rod 503, a second long rod 504, a third long rod 505, a short plate 506 and a second motor 507, A short rod 508, a fourth long rod 509 and a screen 510, the top end of the vertical plate 501 is fixedly connected with the left bottom side of the first housing 2, the bottom end of the vertical plate 501 is fixedly connected with the left top side of the arc plate 502, the inner wall of the arc plate 502 is slidably clamped with the right outer wall of the first long rod 503, the second long rod 504 can drive the first long rod 503 to move left and right on the inner wall of the arc plate 502, the right rear end face of the first long rod 503 is rotatably connected with the bottom front face of the second long rod 504 through a pin shaft, the second long rod 504 can rotate through a pin shaft, the top rear end face of the second long rod 504 is rotatably connected with the top front face of the third long rod 505 through a pin shaft, the third long rod 505 can rotate through a pin shaft, the bottom groove of the third long rod 505 is slidably clamped with the right side of the short plate 506, the second motor 506 can drive the right side of the short plate 506 to move up and down in the bottom groove of the third long rod 505, the model of the second motor 507 is YL-0.75KW, the left side of the rear end face of the short plate 506 is fixedly connected with the output end of a second motor 507, the output end of the second motor 507 can drive the short plate 506 to rotate, the rear end face of the second motor 507 is fixedly connected with the back face of the inner wall of a second shell 6, the left side of a first long rod 503 is rotatably connected with the right side of a fourth long rod 509 through a pin shaft, the fourth long rod 509 can rotate through the pin shaft, the left side of the fourth long rod 509 is fixedly connected with the left side of the top of a screen 510, the screen 510 is made of stainless steel, the mesh number of the screen 510 is determined according to specific conditions, the left and right ends of the screen 510 are fixedly connected with the inner sides of two short rods 508, the outer walls of the two short rods 508 penetrate through the left and right sides of the second shell 6, the outer walls of the two short rods 508 are in clearance fit with the second shell 6, the outer walls of the two short rods 508 can move left and right on the left sides of the second shell 6, the arc-shaped plate 502 and the first long rod 503 form a sliding unit, the first long rod 503 can slide left and right in the arc plate 502 to make the sliding more stable, the bottom of the second housing 6 is fixedly connected with the third housing 9, the right side of the inner wall of the third housing 9 is fixedly connected with the second baffle 10, the right side of the inner wall bottom of the third housing 9 is fixedly connected with the guide plate 11, the inside of the third housing 9 is provided with the secondary screening device 7, the secondary screening device 7 comprises a support 701, a long rod 702, a fourth housing 703, a spring 704, a short rod 705, a third motor 706, a T-shaped plate 707, an eccentric wheel 708, a rubber wheel 709 and a transverse plate 710, the bottom of the support 701 is fixedly connected with the left side of the inner wall bottom of the third housing 9, the inside of the support 701 is provided with the fourth housing 703, the left side and the right side of the fourth housing 703 are respectively fixedly connected with the inner sides of the four long rods 702, the outer wall of the long rod 702 penetrates through the outer wall of the support 701, the outer wall of the long rod 702 is in clearance fit with the support 701, the outer wall of the long rod 702 can move left and right side of the outer wall of the support 701, the outer wall of the long rod 702 is sleeved with the inner wall of the spring 704, the left end and the right end of the spring 704 are fixedly connected with the inner wall of the support 701 and the outer wall of the fourth shell 703 respectively, when the fourth shell 703 moves left and right, the movement amplitude is increased due to the compression and extension of the springs 704 on the two sides, the upper side and the lower side of the inner wall of the fourth shell 703 are fixedly connected with the upper end and the lower end of the four short rods 705, the model of the third motor 706 is YX3, the inner sides of the four short rods 705 are fixedly connected with the outer wall of the third motor 706, the output ends of the two third motors 706 are rotatably connected with the left side and the right side of the bottom of the T-shaped plate 707 through bearings respectively, the output ends of the two third motors 706 can rotate through the bearings, the back surfaces of the two eccentric wheels 708 are fixedly connected with the output ends of the third motors 706, the output ends of the third motors 706 can drive the eccentric wheels to rotate, the top end of the T-shaped plate 707 is fixedly connected with the left side of the bottom of the transverse plate 710, the right side of the transverse plate 710 is provided with a screen made of stainless steel, the mesh number of the screen is determined according to specific conditions, the left side and the right side of the top of the support 701 are rotatably connected with the center of the rubber wheel 709 through pin shafts, the rubber wheel 709 can rotate through the pin shafts, the top of the rubber wheel 709 is attached to the bottom of the transverse plate 710, the two eccentric wheels 708 are in central symmetry with respect to the T-shaped plate 707, the movement directions of the eccentric wheels 708 are consistent when the eccentric wheels 708 rotate, and the eccentric wheels 708 rotate more uniformly.

When the concrete gravel multistage screening device is used, firstly, the first motor 302, the heating plate 305, the fan 401, the water pump 404, the second motor 507 and the third motor 706 are connected with an external power supply, the first motor 302, the heating plate 305, the fan 401, the water pump 404, the second motor 507 and the third motor 706 work normally, materials enter from an opening on the right side of the top of the first shell 2, the first motor 302 drives the cross rod 303 and the rotating blade 304 to rotate to convey the materials forwards, the triangular blocks separate the materials which are adhered together, the heating plate 305 realizes the drying of the materials, after the materials are dried and separated, the materials flow out from an opening on the left side of the bottom of the first shell 2 and fall onto the screen 510, the second motor 507 drives the short plate 506 to rotate, the short plate 506 moves in a groove of the third long rod 505, the third long rod 505 drives the second long rod 504 to move, the second long rod 504 drives the first long rod 503 to move on the inner wall of the curved plate 502, and then drive the left and right motion of fourth stock 509 to realized the left and right motion of screen cloth 510, realized the first screening of material, the material of sieving out flows through first baffle 8, the material through screen cloth 510 falls on the diaphragm 710 of below, drive eccentric wheel 708 eccentric rotation through third motor 706, because the both sides of fourth shell 703 all are equipped with spring 704, eccentric wheel 708 can make diaphragm 710 move left and right indirectly when rotating, the material moves on diaphragm 710, because the screen cloth has been seted up on the right side of diaphragm 710, the material passes through the screen cloth in the motion under, the material that does not pass through the screen cloth flows out by second baffle 10, the material through the screen cloth flows out through guide plate 11.

In the description of the present invention, it is to be understood that the terms "coaxial", "bottom", "one end", "top", "middle", "other end", "upper", "one side", "top", "inner", "front", "center", "both ends", and the like, indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore, should not be construed as limiting the present invention.

In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "disposed," "connected," "fixed," "screwed" and the like are to be construed broadly, e.g., as meaning fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; they may be directly connected or indirectly connected through an intermediate medium, and may be connected through the inside of two elements or in an interaction relationship between two elements, unless otherwise specifically defined, and the specific meaning of the above terms in the present invention will be understood by those skilled in the art according to specific situations.

Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.

Claims (8)

1. The utility model provides a multistage screening installation of gravel for concrete, includes pillar (1) and first shell (2), is located the right side the bottom right side fixed connection of the top of pillar (1) and first shell (2), its characterized in that: a drying device (3) is arranged in the first shell (2);

the drying device (3) comprises a first bracket (301), a first motor (302), a cross bar (303), a rotating blade (304) and a heating plate (305);

the left end of first support (301) and the outer wall right side fixed connection of first shell (2), the inside of first support (301) and the outer wall fixed connection of first motor (302), the output of first motor (302) and the right-hand member fixed connection of horizontal pole (303), the left and right sides of horizontal pole (303) is rotated through the inner wall left and right sides of bearing and first shell (2) respectively and is connected, the outer wall of horizontal pole (303) and the inner wall fixed connection of rotating vane (304), hot plate (305) fixed connection is at the inner wall of first shell (2).

2. The multi-stage gravel screening apparatus for concrete according to claim 1, wherein: triangular blocks are distributed on the surface of the cross rod (303) at equal intervals.

3. The multi-stage gravel screening apparatus for concrete according to claim 1, wherein: a recovery device (4) is arranged on the left side of the first shell (2);

the recovery device (4) comprises a fan (401), a water tank (402), a rubber plug (403), a water pump (404) and a ring pipe (405);

the bottom of fan (401) and the left side top fixed connection of first shell (2), the input of fan (401) is linked together with the top left side of first shell (2), the output of fan (401) is linked together with the right side top of water tank (402), the inner wall top left side of water tank (402) and the outer wall interference fit of rubber buffer (403), the bottom left side of water tank (402) and the top fixed connection of left side pillar (1), the inner wall bottom left side of water tank (402) and the bottom fixed connection of water pump (404), the output of water pump (404) and the left end fixed connection of ring pipe (405).

4. The multistage screening apparatus of gravel for concrete according to claim 3, wherein: the grommet (405) is arranged in a wave shape.

5. The multi-stage gravel screening apparatus for concrete according to claim 1, wherein: a second shell (6) is fixedly connected to the left side of the bottom of the first shell (2), a first baffle (8) is fixedly connected to the bottom of the left side of the inner wall of the second shell (6), and a prescreening device (5) is arranged inside the second shell (6);

the primary screening device (5) comprises a vertical plate (501), an arc-shaped plate (502), a first long rod (503), a second long rod (504), a third long rod (505), a short plate (506), a second motor (507), a short rod (508), a fourth long rod (509) and a screen (510);

the top end of the vertical plate (501) is fixedly connected with the left side of the bottom of the first shell (2), the bottom end of the vertical plate (501) is fixedly connected with the left side of the top of the arc-shaped plate (502), the inner wall of the arc-shaped plate (502) is connected with the right side of the outer wall of the first long rod (503) in a sliding mode, the right side of the rear end face of the first long rod (503) is connected with the bottom of the front face of the second long rod (504) in a rotating mode through a pin shaft, the top of the rear end face of the second long rod (504) is connected with the top of the front face of the third long rod (505) in a rotating mode through a pin shaft, the bottom groove of the third long rod (505) is connected with the right side of the short plate (506) in a sliding mode through a pin shaft, the left side of the rear end face of the short plate (506) is fixedly connected with the output end of the second motor (507), the rear end face of the second motor (507) is fixedly connected with the back face of the inner wall of the second shell (6), the left side of the first long rod (503) is connected with the right side of the fourth long rod (509) in a rotating mode through a pin shaft, the left side of fourth stock (509) and the top left side fixed connection of screen cloth (510), both ends and the inboard fixed connection of two quarter butt (508) about screen cloth (510), two the left and right sides of second shell (6) is run through to the outer wall of quarter butt (508), two the outer wall and the second shell (6) clearance fit of quarter butt (508).

6. The multistage screening apparatus of gravel for concrete according to claim 5, wherein: the arc-shaped plate (502) and the first long rod (503) form a sliding unit.

7. The multistage screening apparatus of gravel for concrete according to claim 5, wherein: the bottom of the second shell (6) is fixedly connected with a third shell (9), the right side of the inner wall of the third shell (9) is fixedly connected with a second baffle (10), the right side of the bottom of the inner wall of the third shell (9) is fixedly connected with a guide plate (11), and a secondary screening device (7) is arranged in the third shell (9);

the secondary screening device (7) comprises a support (701), a long rod (702), a fourth shell (703), a spring (704), a short rod (705), a third motor (706), a T-shaped plate (707), an eccentric wheel (708), a rubber wheel (709) and a transverse plate (710);

the bottom of the support (701) is fixedly connected with the left side of the bottom of the inner wall of the third shell (9), a fourth shell (703) is arranged inside the support (701), the left side and the right side of the fourth shell (703) are respectively fixedly connected with the four inner sides of the long rods (702), the outer wall of each long rod (702) penetrates through the outer wall of the support (701), the outer wall of each long rod (702) is in clearance fit with the support (701), the outer wall of each long rod (702) is sleeved with the inner wall of a spring (704), the left end and the right end of each spring (704) are respectively fixedly connected with the inner wall of the support (701) and the outer wall of the fourth shell (703), the upper side and the lower side of the inner wall of the fourth shell (703) are fixedly connected with the upper end and the lower end of the four short rods (705), the inner sides of the four short rods (705) are fixedly connected with the outer wall of a third motor (706), and the output ends of the two third motors (706) are respectively rotated with the left side and the right side and the bottom of a T-shaped plate (707) through a bearing The back surfaces of the two eccentric wheels (708) are fixedly connected with the output end of a third motor (706), the top end of the T-shaped plate (707) is fixedly connected with the left side of the bottom of the transverse plate (710), the left side and the right side of the top of the support (701) are rotatably connected with the center of the rubber wheel (709) through pin shafts, and the top of the rubber wheel (709) is attached to the bottom of the transverse plate (710).

8. The multi-stage gravel screening apparatus for concrete according to claim 7, wherein: the two eccentrics (708) are centrosymmetric with respect to the T-shaped plate (707).

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