CN114042616B

CN114042616B - Grit sieving mechanism that building engineering used

Info

Publication number: CN114042616B
Application number: CN202111270170.8A
Authority: CN
Inventors: 赵玉龙
Original assignee: Worten Construction Co ltd
Current assignee: Worten Construction Co ltd
Priority date: 2021-10-29
Filing date: 2021-10-29
Publication date: 2023-01-24
Anticipated expiration: 2041-10-29
Also published as: CN114042616A

Abstract

The invention relates to the technical field of engineering machinery, and discloses a sand screening device for constructional engineering, which comprises a base, wherein a stone storage groove is fixedly arranged at a position, close to one end, of the top of the base, and an included angle of thirty degrees is kept between a bus at the top of the outer surface of a screen device and a plane at the top of the base, so that large-particle stones cannot pass through the screen and move towards one side with a larger pipe diameter under the action of component force of centrifugal force, and small-particle sand particles slide under the action of component force of centrifugal force and pass through the screen and are screened out, so that the sand particles can be better screened out from the inside of the screen device, the sand screening efficiency of the device is improved, the stones in the sand particles can continuously move to one side with a larger caliber along with the rotation of the screen device and are finally discharged out of the screen device, the problem that the sand screening efficiency of a traditional sand screening machine is continuously reduced due to the fact that a large number of stones are retained in the traditional sand screening machine due to the adoption of a cylindrical sand screening net is avoided, and the running stability of the device is improved.

Description

Grit sieving mechanism that building engineering used

Technical Field

The invention relates to the technical field of engineering machinery, in particular to a sand and stone screening device for constructional engineering.

Background

Can often use various engineering equipment on building engineering, wherein the screening sand machine is wherein a very important equipment, and the structure mainly has driving system, the screen cloth, support and transportation equipment constitute, drive the columniform screen cloth through driving system and filter the grit in the net, the sand of normal size can spill from the small opening of screen cloth in the grit, and the great stone of granule can be stayed in the screen cloth, can be carried away and pile up in other positions along with transportation equipment, this is the most extensive screening sand device of present application range, have simple structure, high durability and convenient use, advantages such as low cost.

Although the existing sand screening device has many advantages, the parallel-prevention cylindrical screen can cause that the stones piled inside cannot be discharged, the excessive stones can prevent the sand with normal size from leaking from the leakage hole, the screening efficiency is reduced, the stones piled inside must be cleaned manually, if the accumulated stones are prevented from being cleaned in an inclined mode by utilizing a sliding mode, partial sand is discharged along with the stones, and waste is caused.

Disclosure of Invention

Aiming at the defects of the existing sandstone screening device for constructional engineering in the background technology in the using process, the invention provides the sandstone screening device for constructional engineering, which has the advantage of synchronously discharging stones in the sand screening process and solves the problem that the traditional equipment cannot normally discharge the stones which cannot be screened out.

The invention provides the following technical scheme: the utility model provides a grit sieving mechanism that building engineering used, includes the base, fixed mounting has the stone storage groove on the position that the base top is close to one end, fixed mounting has the support on the top of base and the position that is close to the stone storage groove, the top fixed mounting of support has the appearance that hinders the sand board and hinder the sand board and be the round platform form, the less one end fixed mounting of sand board aperture has the sleeve, the unloading hole has been seted up at telescopic top, fixed mounting has the unloading pipe on the sleeve surface and the position that is located unloading hole top, telescopic inside movable adjustment has screen device, screen device's one end fixed mounting has transmission, fixed mounting has the cushion on the position that the base top is close to the other end, the top fixed mounting of cushion has the engine, the one end of engine output shaft and transmission's one end fixed connection, fixed mounting has the sand separating plate on the base top and the position that is located under the screen device, the cross-section of separating the sand plate is triangle-shaped.

Preferably, the axes of the sand blocking plate, the sleeve, the screen device, the transmission device and the power machine are all on the same central line.

Preferably, a generatrix of the outer surface of the screen device, which is positioned at the bottom, is parallel to a plane of the top of the base, and an included angle of thirty degrees is kept between the generatrix of the outer surface of the screen device, which is positioned at the top, and the plane of the top of the base.

Preferably, the screen cloth device includes the connecting plate, one side fixed mounting of connecting plate has transmission, the opposite side fixed mounting of connecting plate has just sieve pole and just sieves the pole and distribute with the mode of annular array for first, the axis of just sieving the pole and the contained angle between the plane of connecting plate one side are fifteen degrees, the one end fixed mounting of just sieving the pole has an inner fixed plate, connecting plate and inner fixed plate activity are cup jointed in telescopic inside, the one end fixed mounting of inner fixed plate has dead lever and dead lever to distribute with the mode of annular array, interconnect and constitute a round platform column structure between one side fixed mounting of dead lever and screen cloth and the dead lever, the one end fixed mounting of dead lever has an outer fixed plate, fixed mounting has balancing weight and balancing weight to correspond with transmission on the inner wall of outer fixed plate.

Preferably, the transmission device comprises a transmission plate, one side of the transmission plate is fixedly connected with the connecting plate, a limiting shaft sleeve is fixedly mounted at the position, located at the center, of the other side of the transmission plate, a limiting rotating shaft is movably sleeved inside the limiting shaft sleeve, a spring seat is fixedly mounted at one end of the limiting rotating shaft, a transmission spring is fixedly mounted at one side of the spring seat and at the position, located at the outer side of the limiting rotating shaft, of the position, one end of the transmission spring is fixedly connected with the transmission plate, the other side of the spring seat is fixedly connected with one end of the output shaft of the power machine, and the connecting position between the transmission spring and the transmission plate corresponds to the balancing weight.

Preferably, the rotational speed of the power machine output is n and the sandstone inside rotates synchronously with the screening device under the action of centrifugal force when the rotational speed of the screening device reaches n.

The invention has the following beneficial effects:

1. according to the invention, the transmission spring is fixedly arranged at the position on one side of the spring seat and positioned outside the limiting rotating shaft, one end of the transmission spring is fixedly connected with the transmission plate, so that the transmission plate is not in rigid connection with the spring seat for transmission, the torque formed by the rotation of the spring seat in the process of driving the spring seat to rotate by the power machine can be released through the transmission spring and cannot be completely transmitted to the transmission plate, the rotating speeds of the transmission plate and the screen device are always unequal to the rotating speed of the power machine, if the connecting point of the transmission spring and the transmission plate is positioned at the bottom of the transmission plate (as shown in the position A in figure 7), the torque direction points to the horizontal left direction in figure 7, and the gravity direction and the torque direction form a ninety-degree included angle, so that the gravity cannot hinder the transmission plate from rotating, if the connection point of the transmission spring and the transmission plate is located on the left side of the transmission plate (as shown in the position of point B in fig. 7) along with the rotation of the transmission plate, the torque direction is directed to the vertically upward direction in fig. 7, and the gravity direction and the torque direction form an included angle of one hundred eighty degrees, the resistance is the largest and the rotation speed is the slowest at this time, so that the rotation speed is reduced and the rotation speed is less than n in the process of rotating from the point A to the point B, if the connection point of the transmission spring and the transmission plate along with the rotation of the transmission plate is located on the top of the transmission plate (as shown in the position of point C in fig. 7), the torque direction is directed to the horizontal right direction in fig. 7, and the gravity direction and the torque direction form an included angle of ninety degrees, so that the gravity does not hinder the rotation of the transmission plate, so that the rotation speed is increased and the rotation speed is less than n in the process of rotating from the point B to the point C, if the connection point of the transmission spring and the transmission plate along with the rotation of the transmission plate is located on the right side of the transmission plate (as shown in the position of point D in fig. 7), at the moment, the torque direction is directed to the vertical downward direction in figure 7, the gravity direction forms a zero-degree included angle in the torque direction, the resultant force of the torque and the gravity is the largest and the rotating speed is the fastest, so that the rotating speed is increased in the process of rotating from the point C to the point D, the rotating speed is greater than n, if the connecting point of the transmission spring and the transmission plate is positioned at the bottom of the transmission plate (such as the position A shown in figure 7) again along with the rotation of the transmission plate, the rotating speed is reduced in the process of rotating from the point D to the point A, the rotating speed is greater than n, so that the rotating speed in the whole rotating process is greater than half-way rotating speed which is less than n, and the sand inside rotates synchronously with the screen device under the action of centrifugal force when the rotating speed of the screen device reaches n, the rotating speed in the half-way is less than n, the sand rolls upwards at the bottom of the inner cavity of the screen device to screen the screen device, and the rotating speed in the half-way is greater than n, the sand and stone can rotate along with the screen device under the action of centrifugal force, at the moment, a bus positioned at the top of the outer surface of the screen device and a plane where the top of the base are positioned keep an included angle of thirty degrees, so that large-grained stones cannot pass through the screen and move towards one side with a larger pipe diameter under the action of component force of the centrifugal force, and small-grained sand grains slide under the action of component force of the centrifugal force, pass through the screen and are screened out, so that the sand grains can be better screened out from the inside of the screen device, the sand screening efficiency of the device is improved, meanwhile, unqualified stones in the sand grains can continuously move towards one side with the larger diameter along with the rotation of the screen device, and finally are discharged from the screen device and fall into the stone storage groove, and the problem that the sand screening efficiency of the traditional sand screening machine is continuously reduced due to the fact that a large number of stones are remained in the traditional sand screening machine because of a cylindrical sand screening net is adopted is avoided, the stability of the device operation has been improved.

2. According to the sand separating device, the axes of the sand blocking plate, the sleeve, the screen device, the transmission device and the power machine are all on the same central line, so that sand thrown out of the top of the screen device by the screen device is blocked by the sand blocking plate and slides to the top of the sand separating plate from two sides of the screen device in the process that the rotating speed of the screen device is greater than n, the phenomenon that the sand thrown out of the top of the screen device cannot be concentrated and scattered to cause that the subsequent concentration is needed to waste labor force is avoided, and the use cost of the device is reduced.

3. According to the invention, the primary screening rods are fixedly arranged on the other side of the connecting plate and are distributed in the annular array mode, so that sand can pass through the primary screening of the primary screening rods before entering the screen device, the screen is prevented from being damaged due to the fact that large-particle stones enter the screen device, and the service life of the device is prolonged.

Drawings

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

FIG. 2 is a schematic cross-sectional view of the structure of the present invention;

FIG. 3 is a schematic view of a structural screen apparatus of the present invention;

FIG. 4 is a schematic cross-sectional view of a structural screen apparatus of the present invention;

FIG. 5 is a schematic view of a transmission of the present invention;

FIG. 6 is a schematic cross-sectional view of a transmission device of the present invention;

FIG. 7 is a schematic view of the position of the connection between the transmission plate and the transmission spring according to the present invention;

FIG. 8 is a schematic diagram of the actual rotational speed of the structure of the present invention.

In the figure: 1. a base; 2. a stone storage tank; 3. a support; 4. a sand blocking plate; 5. a sleeve; 6. a blanking hole; 7. a discharging pipe; 8. a screen device; 81. a connecting plate; 82. primary screening rods; 83. an inner fixing plate; 84. fixing the rod; 85. a screen mesh; 86. an outer fixing plate; 9. a transmission device; 91. a drive plate; 92. a limiting shaft sleeve; 93. a limiting rotating shaft; 94. a spring seat; 95. a transmission spring; 10. cushion blocks; 11. a power machine; 12. and (5) separating the sand.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

Referring to fig. 1-2, a sand screening device for construction engineering includes a base 1, a stone storage groove 2 is fixedly installed at a position close to one end of the top of the base 1, a bracket 3 is fixedly installed at a position close to the stone storage groove 2 at the top of the base 1, a sand blocking plate 4 is fixedly installed at the top of the bracket 3, the sand blocking plate 4 is in a circular truncated cone shape, a sleeve 5 is fixedly installed at one end of the sand blocking plate 4 with a smaller caliber, a blanking hole 6 is formed at the top of the sleeve 5, a blanking pipe 7 is fixedly installed at a position on the outer surface of the sleeve 5 and at the top of the blanking hole 6, a screen device 8 is movably adjusted inside the sleeve 5, a transmission device 9 is fixedly installed at one end of the screen device 8, a cushion block 10 is fixedly installed at a position close to the other end of the top of the base 1, a power machine 11 is fixedly connected with one end of the transmission device 9 at one end of an output shaft of the power machine 11, a sand separating plate 12 is fixedly installed at a position right below the screen device 8 at the top of the base 1, and the sand separating plate 12 has a triangular cross section.

Referring to fig. 1-2, the axes of the sand-blocking plate 4, the sleeve 5, the screen device 8, the transmission device 9 and the power machine 11 are all on the same central line, so that sand thrown out from the top of the screen device 8 by the screen device 8 in the process of rotating at a speed greater than n is blocked by the sand-blocking plate 4 and falls off from the two sides of the screen device 8 to the top of the sand-separating plate 12, thereby avoiding the waste of labor force caused by subsequent concentration due to the fact that the sand thrown out from the top of the screen device 8 cannot be concentrated and scattered everywhere, and reducing the use cost of the device.

Referring to fig. 1-2, the generatrix of the outer surface of the screen device 8 at the bottom is parallel to the plane of the top of the base 1, and the generatrix of the outer surface of the screen device 8 at the top is at an angle of thirty degrees to the plane of the top of the base 1.

Referring to fig. 1 to 4, the screen device 8 includes a connecting plate 81, a transmission device 9 is fixedly installed on one side of the connecting plate 81, a primary screening rod 82 is fixedly installed on the other side of the connecting plate 81, and the primary screening rods 82 are distributed in an annular array manner, so that sand can pass through the primary screening of the primary screening rod 82 before entering the screen device 8, and damage of the screen mesh 85 caused by large-particle stones entering the inside of the screen device 8 is avoided, thereby prolonging the service life of the device, an included angle between an axis of the primary screening rod 82 and a plane on one side of the connecting plate 81 is fifteen degrees, an inner fixing plate 83 is fixedly installed at one end of the primary screening rod 82, the connecting plate 81 and the inner fixing plate 83 are movably sleeved inside the sleeve 5, a fixing rod 84 is fixedly installed at one end of the inner fixing plate 83, the fixing rod 84 is distributed in an annular array manner, the screen mesh 85 is fixedly installed at one side of the fixing rod 84, the screen mesh 85 and the fixing rod 84 are connected with each other to form a circular truncated cone-shaped structure, an outer fixing plate 86 is fixedly installed at one end of the fixing plate 84, a balancing weight 87 is fixedly installed on the inner wall of the outer fixing plate 86, and the balancing weight 87 is corresponding to the transmission device 9.

Referring to fig. 4-8, the transmission device 9 includes a transmission plate 91, one side of the transmission plate 91 is fixedly connected to the connection plate 81, a limiting shaft sleeve 92 is fixedly installed at a position of the other side of the transmission plate 91 at the center, a limiting rotation shaft 93 is movably sleeved inside the limiting shaft sleeve 92, one end of the limiting rotation shaft 93 is fixedly installed with a spring seat 94, a transmission spring 95 is fixedly installed at a position of one side of the spring seat 94 and outside the limiting rotation shaft 93, and one end of the transmission spring 95 is fixedly connected to the transmission plate 91, so that the transmission plate 91 is not rigidly connected to the spring seat 94, a torque formed by rotation of the spring seat 94 during rotation of the spring seat 94 driven by the power machine 11 is released by the transmission spring 95 and cannot be completely transmitted to the transmission plate 91, and the rotation speeds of the transmission plate 91 and the screen device 8 are always unequal to the rotation speed of the power machine 11, if the connection point of the transmission spring 95 and the transmission plate 91 is located at the bottom of the transmission plate 91 (the position of point a shown in fig. 7), the torque direction is oriented in the horizontal left direction in fig. 7, and the angle between the gravity direction and the torque direction is ninety degrees, so that the gravity does not prevent the transmission plate 91 from rotating, if the connection point of the transmission spring 95 and the transmission plate 91 along with the rotation of the transmission plate 91 is located at the left side of the transmission plate 91 (the position of point B shown in fig. 7), the torque direction is oriented in the vertical upward direction in fig. 7, and the angle between the gravity direction and the torque direction is one hundred eighty degrees, the resistance is the largest and the rotation speed is the slowest, so that the rotation speed is slowed down and less than n in the process of rotating from point a to point B, if the connection point of the transmission spring 95 and the transmission plate 91 along with the rotation of the transmission plate 91 is located at the top of the transmission plate 91 (the position of point C shown in fig. 7), at this time, the torque direction is directed to the horizontal rightward direction in fig. 7, and the gravity direction forms a ninety degree included angle with the torque direction, so that the gravity does not hinder the rotation of the transmission plate 91, and the rotation speed is increased and less than n in the process of rotating from the point B to the point C, if the connection point of the transmission spring 95 and the transmission plate 91 along with the rotation of the transmission plate 91 is located on the right side of the transmission plate 91 (the point D shown in fig. 7), at this time, the torque direction is directed to the vertical downward direction in fig. 7, and the gravity direction forms a zero degree included angle with the torque direction, at this time, the resultant force of the torque and the gravity is the largest and the rotation speed is the fastest, so that the rotation speed is increased and greater than n in the process of rotating from the point C to the point D, if the connection point of the transmission spring 95 and the transmission plate 91 along with the rotation of the transmission plate 91 is located at the bottom of the transmission plate 91 again (the point a shown in fig. 7), the rotating speed is reduced and is greater than n in the process of rotating from the point D to the point A, the half-way rotating speed is greater than n in the whole rotating process, the other half-way rotating speed is less than n, because the rotating speed output by the power machine 11 is n and the rotating speed of the screen device 8 reaches n, the inner sand and stone synchronously rotate with the screen device 8 under the action of centrifugal force, the half-way rotating speed is less than n, the sand and stone can roll upwards at the bottom of the inner cavity of the screen device 8 to screen the inner cavity, the half-way rotating speed is greater than n, the sand and stone can rotate together with the screen device 8 under the action of the centrifugal force, at the moment, a thirty-degree included angle is kept between a bus at the top of the outer surface of the screen device 8 and the plane at the top of the base 1, and large-grained stones can not move towards one side with a larger pipe diameter under the action of component force of the centrifugal force through the screen 85, small-sized sand grains slide under the component force of centrifugal force and pass through the screen mesh 85 to be screened out, so that the sand grains can be better screened out from the inside of the screen mesh device 8, the sand screening efficiency of the device is improved, meanwhile, unqualified stones in the sand grains can continuously move to one side with a larger caliber along with the rotation of the screen mesh device 8, and finally are discharged from the screen mesh device 8 and fall into the stone storage groove 2, the problem that the sand screening efficiency is continuously reduced due to the fact that a large number of stones are left in the traditional sand screening machine due to the adoption of a cylindrical sand screening net is avoided, the running stability of the device is improved, an included angle of thirty degrees is kept between a bus located at the top of the outer surface of the screen mesh device 8 and a plane located at the top of the base 1, the other side of the spring seat 94 is fixedly connected with one end of an output shaft of the power machine 11, and the connection position between the transmission spring 95 and the transmission plate 91 corresponds to the balancing weight 87.

Referring to fig. 1-2, when the power machine 11 outputs n rotation speed and the rotation speed of the screen device 8 reaches n, the sand inside rotates synchronously with the screen device 8 under the action of centrifugal force.

The using method of the invention is as follows:

in the using process, the sand material passes through the primary screening of the primary screening rod 82 before entering the screen device 8, the power machine 11 drives the spring seat 94 to rotate so as to drive the transmission spring 95 to rotate, thereby driving the transmission plate 91 and the screen device 8 to rotate, because the transmission plate 91 is not in rigid connection with the spring seat 94, the torque formed by the rotation of the spring seat 94 in the process that the power machine 11 drives the spring seat 94 to rotate can be released through the transmission spring 95 and can not be completely transmitted to the transmission plate 91, so that the rotating speeds of the transmission plate 91 and the screen device 8 are always unequal to the rotating speed of the power machine 11, if the connection point of the transmission spring 95 and the transmission plate 91 is positioned at the bottom of the transmission plate 91 (as shown in the position A in figure 7), the torque direction refers to the horizontal left direction in figure 7, and the gravity direction and the torque direction form a ninety degree angle, so that the gravity does not hinder the transmission plate 91 from rotating, if the connection point of the transmission spring 95 and the transmission plate 91 along with the rotation of the transmission plate 91 is positioned at the left side of the transmission plate 91 (as shown in the position of the point B in fig. 7), the torque direction is directed to the vertical upward direction in fig. 7, and the gravity direction and the torque direction form a one-hundred-eighty degree angle, at this time, the resistance is maximum, the rotating speed is slowest, so that the rotating speed is reduced in the process of rotating from the point a to the point B, and the rotating speed is less than n, if the connection point of the transmission spring 95 and the transmission plate 91 along with the rotation of the transmission plate 91 is positioned at the top of the transmission plate 91 (as shown in the position of the point C in fig. 7), at this time, the torque direction is directed to the horizontal rightward direction in fig. 7, and the gravity direction and the torque direction form a ninety degree angle, so that the gravity does not hinder the transmission plate 91 from rotating, the rotating speed is increased and is less than n in the process of rotating from the point B to the point C, if the connecting point of the rotating transmission spring 95 and the transmission plate 91 of the transmission plate 91 is positioned on the right side of the transmission plate 91 (the position of the point D shown in figure 7), the torque direction points to the vertical downward direction in figure 7, and the gravity direction forms a zero-degree included angle with the torque direction, the resultant force of the torque and the gravity is maximum and the rotating speed is fastest, so that the rotating speed is increased and is greater than n in the process of rotating from the point C to the point D, if the connecting point of the rotating transmission spring 95 and the transmission plate 91 of the transmission plate 91 is positioned at the bottom of the transmission plate 91 again (the position of the point A shown in figure 7), the rotating speed is reduced and is greater than n in the process of rotating from the point D to the point A, so that the half-stroke rotating speed is greater than n in the whole rotating process of rotating, and the other half-stroke rotating speed is less than n, because the rotating speed output by the power machine 11 is n and the sand inside the screen device 8 rotates synchronously with the screen device 8 under the action of centrifugal force when the rotating speed of the screen device 8 reaches n, so that the half-way rotating speed is less than n, the sand can roll up at the bottom of the inner cavity of the screen device 8 to screen the sand, the half-way rotating speed is more than n, the sand can rotate along with the screen device 8 under the action of centrifugal force, at the moment, an included angle of thirty degrees is kept between a bus at the top of the outer surface of the screen device 8 and a plane at the top of the base 1, large-grained stones cannot move towards one side with a larger pipe diameter under the action of component force of the centrifugal force through the screen 85, and small-grained sand slides under the action of the component force of the centrifugal force and passes through the screen 85 to be screened out, so that the sand can be better screened out from the inside of the screen device 8, the sand thrown out of the top of the screen device 8 by the screen device 8 during the rotation speed greater than n is blocked by the sand blocking plate 4 and slides from both sides of the screen device 8 to the top of the sand separating plate 12.

It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus.

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

1. The utility model provides a grit sieving mechanism that building engineering used, includes base (1), its characterized in that: the sand storage device is characterized in that a position, close to one end, of the top of the base (1) is fixedly provided with a stone storage groove (2), a position, close to the stone storage groove (2), of the top of the base (1) is fixedly provided with a support (3), the top of the support (3) is fixedly provided with a sand blocking plate (4) and a sand blocking plate (4), the shape of the sand blocking plate is in a round table shape, one end, with a smaller caliber, of the sand blocking plate (4) is fixedly provided with a sleeve (5), the top of the sleeve (5) is provided with a blanking hole (6), the outer surface of the sleeve (5) is fixedly provided with a blanking pipe (7) at the position, which is located at the top of the blanking hole (6), the inner movable adjustment of the sleeve (5) is provided with a screen mesh device (8), one end of the screen mesh device (8) is fixedly provided with a transmission device (9), a position, close to the other end, of the top of the base (1) is fixedly provided with a cushion block (10), the top of the cushion block (10) is fixedly provided with a power machine (11), one end of an output shaft of the power machine (11) is fixedly connected with one end of the transmission device (9), and the sand blocking plate (81), and the triangular transmission device (81) is provided with a connecting plate (12), the other side of connecting plate (81) fixed mounting have first sieve pole (82) and first sieve pole (82) distribute with annular array's mode, the axis of first sieve pole (82) and the contained angle between connecting plate (81) one side plane are fifteen degrees, the one end fixed mounting of first sieve pole (82) has interior fixed plate (83), connecting plate (81) and interior fixed plate (83) activity cup joint in the inside of sleeve (5), the one end fixed mounting of interior fixed plate (83) has dead lever (84) and dead lever (84) to distribute with annular array's mode, one side fixed mounting of dead lever (84) has screen cloth (85) and interconnect between screen cloth (85) and dead lever (84) and constitutes a round platform column structure, the one end fixed mounting of dead lever (84) has outer fixed plate (86), fixed mounting has balancing weight (87) and balancing weight (87) on the inner wall of outer fixed plate (86) and corresponds with transmission (9), transmission (9) includes shaft sleeve (91), one side and the fixed connection of transmission plate (91) is connected with connecting plate (81), fixed mounting has spacing axle sleeve (93) on the fixed mounting of pivot (92), spacing position (93) is located pivot axle sleeve 92), pivot (93) fixed mounting has spacing spring holder (93), a transmission spring (95) is fixedly mounted on one side of the spring seat (94) and located on the outer side of the limiting rotating shaft (93), one end of the transmission spring (95) is fixedly connected with the transmission plate (91), the other side of the spring seat (94) is fixedly connected with one end of an output shaft of the power machine (11), and the connection position between the transmission spring (95) and the transmission plate (91) corresponds to the balancing weight (87).

2. The sand screening device for the constructional engineering according to claim 1, wherein: the axes of the sand blocking plate (4), the sleeve (5), the screen device (8), the transmission device (9) and the power machine (11) are all on the same central line.

3. The sand screening device for the constructional engineering according to claim 1, wherein: the bus located at the bottom of the outer surface of the screen device (8) is parallel to the plane where the top of the base (1) is located, and the bus located at the top of the outer surface of the screen device (8) and the plane where the top of the base (1) is located keep an included angle of thirty degrees.

4. The sand screening device for the constructional engineering according to claim 1, wherein: when the rotating speed output by the power machine (11) is n and the rotating speed of the screen device (8) reaches n, the sand inside and the screen device (8) synchronously rotate under the action of centrifugal force.