CN117225573B - Sand and gravel screening equipment for building pouring and its operation method - Google Patents

Abstract

The invention relates to the technical field of sand and stone screening, which is used for solving the problems that the existing sand and stone screening is usually manually operated, and the mud blocks bonded with sand and stone cannot be effectively sorted, so that a large amount of soil still exists in the sand and stone in the using process; compared with the prior art, the sand-stone-containing soil block grinding machine can crush and grind soil blocks containing sand stones, and the sand stones and the soil can be well screened by utilizing a water washing flushing mode.

Description

Sand and gravel screening equipment for building pouring and its operation method

Technical field

The invention relates to the technical field of sand and gravel screening, specifically a sand and gravel screening equipment used for building pouring and its operating method.

Background technique

Concrete is a composite material in which sand and gravel are one of the main component materials with the largest proportion. In concrete structures, sand and gravel mainly play the role of a skeleton, stabilizing the volume of concrete, transmitting stress, inhibiting shrinkage, and preventing cracking. They play an extremely important role in buildings and infrastructure. It can be said that without sand and gravel, there would be no concrete. There are no concrete buildings and foundation works.

Since a large amount of sand and gravel used in buildings has been placed on the ground for a long time, a large amount of sand and gravel is in contact with the soil in the sand and gravel pile. During the digging and transportation process, the sand and gravel are easily mixed and bonded with the soil to form a large amount of sand and gravel. However, the existing screening of sand and gravel is to manually beat the sand and gravel on the screen with tools such as shovels. In this way, artificial sand and gravel screening cannot effectively screen the soil mixed with sand and gravel, which will lead to subsequent There is a large amount of soil in the sand and gravel used to produce concrete. Once the concrete mixed with soil is poured on the wall of a building, it will easily lead to a decrease in the support strength of the building wall due to the mixing of soil and the hollowing of the wall, thereby affecting the building. The overall stability of the object.

In view of the above technical defects, a solution is proposed.

Contents of the invention

The object of the present invention is to provide a sand and gravel screening equipment for building pouring and an operating method thereof to solve the problems mentioned in the above background technology.

In order to achieve the above objects, the present invention provides the following technical solutions:

A kind of sand and gravel screening equipment for building pouring, including a frame, a box body 1 is arranged on the top of the frame, the top of the box body 1 is connected with a box body 2, the top of the box body 2 is connected A feed frame is fixedly installed. Two crushing rollers are provided inside the second box. Multiple sets of slide rails are symmetrically fixed to the inner wall of the first box. A hopper is provided inside the first box. The outer wall of the hopper is fixed with a slide bar through spot welding. The slide bar is slidingly connected in the slide rail. A compression spring is fixedly connected between the slide bar and the inside of the slide rail. The inside of the box body 1 is provided with Has abrasive components;

The abrasive assembly includes a grinding disc and a grinding roller. The inner wall of the box body is fixed with a support frame through spot welding. The grinding disc is arranged inside the hopper. The bottom end of the grinding disc and the top of the support frame move through bearings. The bottom of the grinding disc is connected in an annular array with multiple sets of installation grooves, and the grinding rollers are rotationally connected in the installation grooves.

Further, the top of the grinding plate is fixedly connected with a bevel gear one, the side wall of the hopper is symmetrically provided with a chute, and the inner wall of the box body one is fixed with a support frame two and a support frame three through spot welding, so The support frame 2 is connected with a rotating shaft internally, and the rotating shaft is located at the inner end of the box body and is fixed with a bevel gear 2 meshingly connected with the bevel gear 1 through spot welding;

A rotating rod is rotatably connected to the support frame 3. The top end of the rotating rod is fixedly connected to a dispersion plate. The bottom end of the rotating rod is fixedly connected to a bevel gear 3 meshed with the bevel gear 2.

Further, the second support frame, the third support frame and the first support frame are all located in the chute. The first support frame, the second support frame, the third support frame and the chute are fixedly connected with folding baffles. A passive block is fixedly connected to the bottom of the hopper, a driving rod is rotatably connected to the inner wall of the box body 1, and an active bump matching the passive block is fixed on the outside of the driving rod.

Further, a conveyor belt is provided inside the frame, water filter holes are evenly provided on the outside of the conveyor belt, and a water washing component is provided on the top of the frame;

The water washing assembly includes a horizontal plate and a guide rail. The horizontal plate is fixedly connected to the top of the frame. The guide rail is symmetrically fixed on the top of the horizontal plate. The top of the horizontal plate is symmetrically provided with a limiting slot. The guide rail slides inside. A sliding plate is connected, a rack is fixed on one side of the sliding plate through spot welding, and a spur gear meshingly connected with the rack is movably connected to the top of the horizontal plate through a bearing.

Further, a toggle rod is slidably connected in the limit groove, the top of the toggle rod is fixedly connected to the bottom of the slide plate, the bottom of the toggle rod is fixedly connected to a cleaning brush, and the bottom of the horizontal plate is fixedly installed. There are multiple sets of water spray valves, and the water spray valves are connected to an external mechanism with a water supply function through water pipes.

Further, a drive rail is fixedly connected to the top of one of the slide plates, a support base is fixed to the top of the horizontal plate, a motor is fixed to the top of the support base, and a drive is fixed to the output end of the motor one. The bottom of the driving arm is fixedly connected with a driving block that matches the driving rail, and the bottom of the conveyor belt is provided with a water storage tank.

Further, a motor two for driving the grinding roller to rotate is installed on one side of the box body two. The grinding roller is located at one end outside the box body two and is covered with a runner. The crushing roller is located at one end inside the box body two. Two spur gears are sleeved and fixed, and the two spur gears are meshed and connected. The rotating shaft and the driving rod are both sleeved and fixed with multiple sets of runner two at one end located outside the box body. The runner one and the runner are The two and the two correspondingly arranged runner 2 are connected by a belt.

An operating method of sand and gravel screening equipment for building pouring, including the following steps:

Step 1: The sand and gravel mixed with soil pass through the feeding frame. The second motor drives the crushing roller to rotate. The two crushing rollers that turn in opposite directions preliminarily crush the sand and gravel mixed with soil into large pieces of gravel. The blocks are crushed into small particles of sand, gravel and soil;

Step 2: The dispersing plate in the opposite direction to the rotation of the grinding plate uses centrifugal force to more accurately throw the small sand, gravel and soil blocks into the gap between the grinding plate and the hopper. The hopper is lifted with the cooperation of the active bump and the passive block. The receiving hopper carries the small-grained sand, gravel, and soil blocks and moves upward until the small-grained sand, gravel, and soil blocks contact the grinding roller at the bottom of the grinding disc. The grinding roller rotates along the inner wall of the receiving hopper. The grinding roller rotates while grinding the small-grained sand, gravel, and soil blocks. Further grinding is carried out to grind small particles of sand, gravel and mud into sand and mud;

Step 3: The sand, gravel and mud are moved under the water spray valve under the action of the conveyor belt and continue to be transported forward. The water spray valve flushes the sand, gravel and mud on the surface of the conveyor belt, and at the same time, the reciprocating cleaning brush cleans the surface of the conveyor belt. The sand and gravel and marl are further cleaned, and then the marl in the sand and gravel is thoroughly cleaned to avoid the problem of mud contained in the sand and gravel that affects the use.

Compared with the prior art, the beneficial effects of the present invention are:

When the invention is in use, the large pieces of soil mixed with sand and gravel are initially crushed by the crushing roller, and the dispersing plate throws the small-grained sand and gravel into the gap between the grinding plate and the hopper, and the active bump passes through Push the passive block to drive the hopper to move in the vertical direction, and use the gravity of the hopper and the compression spring to realize the reciprocating movement of the hopper in the vertical direction. The hopper carries small particles of sand, gravel and soil to move upward, and the grinding roller Rotating along the inner wall of the hopper, the grinding roller further grinds the small-grained sand, gravel and soil blocks while rotating, and then grinds the small-grained sand, gravel and soil blocks into sand, gravel and marl. The sand, gravel and marl are transported on the conveyor belt. It is moved to the bottom of the water spray valve under the action of the water spray valve. The water spray valve flushes the sand, gravel and mud on the surface of the conveyor belt. At the same time, the reciprocating cleaning brush further cleans the sand, gravel and mud on the surface of the conveyor belt, and then removes the sand and gravel. The muddy water from the dissolved mud flows through the water filter holes to the water storage tank for centralized collection.

When the invention is used, it is provided with a crushing roller, an abrasive assembly and a water washing assembly, thereby achieving highly automated, high-efficiency screening of soil in sand and gravel and better screening, and solving the problems of existing sand and gravel screening. Manual operation has the problems of low screening efficiency and poor screening effect.

The invention uses the mutual cooperation of the bevel gear one, the bevel gear two and the bevel gear three to make the powder dispersing plate and the grinding plate rotate in opposite directions, so that the dispersing plate can use centrifugal force to more accurately throw the small particles of sand, gravel and soil to the grinding plate and the hopper. within the gap between them, thus greatly shortening the time it takes for small particles of sand, gravel and soil to fall into the gap between the millstone and the receiving hopper. At the same time, the small particles of sand, gravel and soil can interact with the receiving hopper more powerfully under the action of centrifugal force. Impact, small particles of sand, gravel and soil can be dispersed more evenly in the hopper under the strong impact, making it easier for the grinding roller to grind them more fully.

Description of drawings

In order to facilitate understanding by those skilled in the art, the present invention will be further described below in conjunction with the accompanying drawings;

Figure 1 is a front view of the overall internal structure of the present invention;

Figure 2 is a front view of the overall structure of the present invention;

Figure 3 is a schematic structural diagram of the guide rail in the present invention;

Figure 4 is a front view of the internal structure of the box in the present invention;

Figure 5 is a bottom view of the internal structure of the box in the present invention;

Figure 6 is a bottom view of the grinding disc structure in the present invention;

Figure 7 is a top view of the horizontal plate structure in the present invention;

Figure 8 is a schematic structural diagram of the hopper in the present invention.

Reference signs: 1. Frame; 2. Box 1; 3. Box 2; 301. Crushing roller; 4. Feed frame; 5. Slide rail; 6. Hopper; 7. Slider; 8. Abrasive. Components; 801, grinding disc; 802, grinding roller; 803, mounting groove; 804, bevel gear one; 805, bevel gear two; 806, dispersion plate; 807, bevel gear three; 808, passive block; 809, driving rod; 810 , active bump; 9. chute; 10. support frame two; 11. support frame three; 12. rotating shaft; 13. conveyor belt; 14. folding baffle; 15. water washing component; 151. horizontal plate; 152. guide rail; 153. Limit slot; 154. Slide plate; 155. Rack; 156. Spur gear one; 157. Toggle lever; 158. Cleaning brush; 159. Water spray valve; 160. Drive rail; 161. Motor one; 162. Driving arm; 163. Driving block; 164. Water tank; 16. Support base; 17. Runner one; 18. Runner two; 19. Belt.

Detailed ways

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts fall within the scope of protection of the present invention.

Embodiment 1, as shown in Figures 1, 2, 4, 5, 6 and 8, a sand and gravel screening equipment for building pouring includes a frame 1, and the top of the frame 1 is arranged There is a box 2. The top of the box 2 is connected with a box 2 3. A feed frame 4 is fixedly installed on the top of the box 2. Two crushing rollers 301 are provided inside the box 2. The box 2 3 is installed with a motor 2 on one side for driving the grinding roller 301 to rotate. A spur gear 2 is fixed at one end of the grinding roller 301 located inside the box 2 3. The two spur gears 2 are meshed and connected. The inside of the box 1 2 is provided with a The hopper 6 is provided with an abrasive assembly 8 inside the box 2;

The abrasive assembly 8 includes a grinding disc 801 and a grinding roller 802. The inner wall of the box 2 is fixed with a support frame 1 through spot welding. The grinding disc 801 is arranged inside the hopper 6. The bottom end of the grinding disc 801 is movably connected to the top of the support frame 1 through a bearing. , the bottom of the grinding disc 801 is provided with multiple sets of mounting grooves 803 in an annular array, and the grinding roller 802 is rotatably connected in the mounting grooves 803;

The top of the grinding plate 801 is fixedly connected with a bevel gear 804. The inner wall of the box 2 is fixed with a support frame 2 10 and a support frame 3 11 through spot welding. The support frame 2 10 is rotatably connected with a rotating shaft 12 inside;

The bottom of the hopper 6 is fixedly connected with a passive block 808, and the inner wall of the box 2 is rotationally connected with a driving rod 809. The outer side of the driving rod 809 is sleeved and fixed with an active bump 810 that matches the passive block 808;

During the specific setting, the sand and gravel mixed with soil are passed through the feeding frame 4, and the motor 2 drives the crushing roller 301 to rotate. The two crushing rollers 301 rotate in opposite directions through the mutual meshing of the two spur gears 2. The two crushing rollers 301 rotate in opposite directions. Two crushing rollers 301 that rotate in opposite directions preliminarily crush the sand and gravel mixed with soil. It should be noted here that the two crushing rollers 301 are not smooth surfaces, but are equipped with crushing teeth. Through the mutual cooperation of the crushing teeth, it is possible to To effectively avoid the problem of sand and gravel being crushed into powder, the two crushing rollers 301 crush the large gravel and soil blocks, so that the large gravel and soil blocks are crushed into small-sized sand and gravel soil blocks;

The crushing roller 301 has a runner 17 at one end located outside the box 2 3 , and the rotating shaft 12 and the drive rod 809 have multiple sets of runner 2 18 set at one end outside the box 2 . The runner 17 and The two runner 18 and the two corresponding runner 18 are connected by a belt 19. The runner 17 drives the corresponding runner 18 to rotate through the belt 19. The rotation of the second runner 18 drives the rotating shaft 12. It rotates with the driving rod 809. One end of the rotating shaft 12 is located inside the box 2 and is fixed with a bevel gear 2 805 meshing with the bevel gear 804 through spot welding. A rotating rod is rotatably connected in the support frame 3 11, and the top of the rotating rod is fixed. A dispersion plate 806 is connected, and the bottom end of the rotating rod is fixedly connected with a bevel gear three 807 that is meshed with the bevel gear two 805. The rotation of the rotating shaft 12 drives the bevel gear two 805 to rotate. The bevel gear one 804 and the bevel gear three 807 are in the bevel gear 807. Gear two 805 rotates in the opposite direction. Bevel gear three 807 drives the dispersing plate 806 to rotate through the rotating rod. The rotation of the dispersing plate 806 then breaks up the small particles of sand, gravel and soil crushed by the crushing roller 301. Make it evenly dispersed inside the hopper 6;

Through the mutual cooperation of bevel gear one 804, bevel gear two 805 and bevel gear three 807, the rotation directions of the grinding plate 801 and the dispersing plate 806 are opposite. The bevel gear one 804 drives the grinding plate 801 to rotate, and the friction between the grinding plate 801 and the dispersing plate 806 In the opposite direction of rotation, the dispersing plate 806 uses centrifugal force to more accurately throw the small particles of sand, gravel and soil into the gap between the grinding plate 801 and the hopper 6. At the same time, the driving rod 809 drives the active bump 810 to rotate continuously. , the active bump 810 drives the passive block 808 to drive the hopper 6 to move in the vertical direction. The inner wall of the box 2 is symmetrically connected to a plurality of sets of slide rails 5, and the outer wall of the hopper 6 is fixed by spot welding. The slider 7 is slidingly connected in the slide rail 5. A compression spring is fixedly connected between the slider 7 and the slide rail 5. The receiving hopper 6 is lifted with the cooperation of the active bump 810 and the passive block 808. The receiving hopper 6. The small-grained sand, gravel, and soil blocks are moved upward until the small-grained sand, gravel, and soil blocks are in contact with the grinding roller 802 at the bottom of the grinding disc 801. The grinding roller 802 rotates along the inner wall of the receiving hopper 6. The grinding roller 802 rotates while grinding the small particles. The sand, gravel and soil blocks are further ground, and then the small-grain sand, gravel and soil blocks are ground into sand, gravel and mud;

At any time, after the active bump 810 breaks away from the contact with the passive block 808, the hopper 6 will vertically descend by itself under the action of its own gravity and the compression spring, and the hopper 6 will vibrate under the action of the compression spring, thereby moving the inside of the hopper 6 The sand, gravel and mud are scattered and flow into the conveyor belt 13 through the discharge port provided below the hopper 6;

What needs to be explained here is that in order to allow the hopper 6 to smoothly reciprocate in the vertical direction within the box body 2, a chute 9 is symmetrically provided on the side wall of the hopper 6, a support frame 2 10 and a support frame 3 11 and support frame 1 are located in the chute 9. By opening chute 9 on both sides of the hopper 6, the hopper 6 is not blocked by the support frame 1, the support frame 2 10 and the support frame 3 11 while sliding. , and a folding baffle 14 is fixedly connected between the support frame one, the support frame two 10, the support frame three 11 and the chute 9. By setting the folding baffle 14, the folding baffle 14 can move back and forth along with the hopper 6. And folding, thereby sealing the chute 9, preventing the sand, gravel and soil blocks from leaking from the chute 9.

Embodiment 2, as shown in Figures 1 to 3 and 7, large pieces of sand, gravel and soil are ground into sand and mud through the crushing roller 301 and the abrasive assembly 8. In order to remove the mud and fine particles in the sand and gravel. Soil particles are further removed, and the specific improvements are as follows:

A conveyor belt 13 is provided inside the frame 1, water filter holes are evenly provided on the outside of the conveyor belt 13, and a water washing assembly 15 is provided on the top of the frame 1;

The water washing assembly 15 includes a horizontal plate 151 and a guide rail 152. The horizontal plate 151 is fixedly connected to the top of the frame 1. The guide rail 152 is symmetrically fixed on the top of the horizontal plate 151. The top of the horizontal plate 151 is symmetrically provided with a limiting slot 153, and the guide rail 152 slides inside. A sliding plate 154 is connected, a rack 155 is fixed on one side of the sliding plate 154 by spot welding, and a spur gear 156 meshingly connected with the rack 155 is movably connected to the top of the horizontal plate 151 through a bearing;

A toggle rod 157 is slidably connected in the limit groove 153. The top of the toggle rod 157 is fixedly connected to the bottom of the slide plate 154. The bottom of the toggle rod 157 is fixedly connected to a cleaning brush 158. A plurality of sets of spray nozzles are fixedly installed at the bottom of the horizontal plate 151. The water valve 159 and the water spray valve 159 are connected to an external mechanism with a water supply function through a water pipe. The top of a sliding plate 154 is fixedly connected to a drive rail 160. The top of the horizontal plate 151 is fixedly connected to a support base 16. The top of the support base 16 is fixedly connected. There is a motor 161. The output end of the motor 161 is fixedly connected to a driving arm 162. The bottom of the driving arm 162 is fixedly connected to a driving block 163 that matches the driving rail 160. The bottom of the conveyor belt 13 is provided with a water storage tank 164.

During the specific setting, the conveyor belt 13 drives the sand, gravel and mud to be transported synchronously, and then the water spray valve 159 sprays water on the sand, gravel and mud on the surface of the conveyor belt 13. The mud forms muddy water when it encounters water. In order to remove the sand and gravel. Completely remove the mud and start the motor 161. The motor 161 drives the driving arm 162 to rotate. The driving arm 162 drives one of the sliding plates 154 to slide through the cooperation of the driving block 163 and the driving rail 160. The sliding plate 154 reciprocates in the guide rail 152. Sliding, the sliding plate 154 drives the other sliding plate 154 to slide in the opposite direction through the cooperation of the rack 155 and the spur gear 156. The two sliding plates 154 with opposite movement directions drive the cleaning brush 158 provided at the bottom to move in the opposite direction. 158 further cleans the sand, gravel and mud on the surface of the conveyor belt 13, and then cooperates with the water spray valve 159 to thoroughly clean the mud in the sand and gravel. The mud water flows through the water filter hole to the water storage tank 164 for centralized collection. The sludge in the muddy water is precipitated, and the water and sludge are stratified. The stratified water is reused to the water spray valve 159, thereby realizing the reuse of water. The sand and gravel are washed inside through the action of the water washing assembly 15. The mud contained in the sand and gravel must be thoroughly cleaned to avoid the large amount of sludge contained in the sand and gravel that affects the use of the sand and gravel.

The above contents are only examples and descriptions of the structure of the present invention. Those skilled in the art may make various modifications or supplements to the described specific embodiments or substitute them in similar ways, as long as they do not deviate from the structure of the invention or Anything beyond the scope defined by the claims shall belong to the protection scope of the present invention.

In the description of this specification, reference to the terms "one embodiment," "example," "specific example," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one aspect of the invention. in an embodiment or example. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

The preferred embodiments of the invention disclosed above are only intended to help illustrate the invention. The preferred embodiments do not describe all details, nor do they limit the invention to specific implementations. Obviously, many modifications and variations are possible in light of the contents of this specification. These embodiments are selected and described in detail in this specification to better explain the principles and practical applications of the present invention, so that those skilled in the art can better understand and utilize the present invention. The invention is limited only by the claims and their full scope and equivalents.

Claims (5)

1. The utility model provides a sand and stone screening equipment for building pouring, includes frame (1), its characterized in that, the top of frame (1) is provided with first box (2), the top intercommunication of first box (2) has second box (3), the top fixed mounting of second box (3) has feeding frame (4), the inside of second box (3) is provided with two crushing rollers (301), the inside wall symmetry fixedly connected with multiunit slide rail (5) of first box (2), the inside of first box (2) is provided with connects hopper (6), the lateral wall that connects hopper (6) is fixed with draw runner (7) through spot welding, draw runner (7) sliding connection is in slide rail (5), fixedly connected with compression spring between draw runner (7) and slide rail (5) inside, the inside of first box (2) is provided with abrasive material subassembly (8);

the grinding material assembly (8) comprises a grinding disc (801) and a grinding roller (802), wherein the inner wall of the first box body (2) is fixedly provided with a first support frame through spot welding, the grinding disc (801) is arranged in the receiving hopper (6), the bottom end of the grinding disc (801) is movably connected with the top of the first support frame through a bearing, the bottom of the grinding disc (801) is provided with a plurality of groups of mounting grooves (803) in an annular array, and the grinding roller (802) is rotationally connected in the mounting grooves (803);

the bottom of the receiving hopper (6) is fixedly connected with a driven block (808), the inner wall of the first box body (2) is rotationally connected with a driving rod (809), and the outer side of the driving rod (809) is fixedly sleeved with a driving lug (810) matched with the driven block (808);

a conveyor belt (13) is arranged in the frame (1), water filtering holes are uniformly formed in the outer side of the conveyor belt (13), and a water washing assembly (15) is arranged at the top of the frame (1);

the washing assembly (15) comprises a transverse plate (151) and a guide rail (152), the transverse plate (151) is fixedly connected to the top of the frame (1), the guide rail (152) is symmetrically fixed to the top of the transverse plate (151), a limit groove (153) is symmetrically formed in the top of the transverse plate (151), a sliding plate (154) is slidably connected in the guide rail (152), a rack (155) is fixed on one side of the sliding plate (154) through spot welding, and a first spur gear (156) meshed with the rack (155) is movably connected to the top of the transverse plate (151) through a bearing;

the water-spraying device is characterized in that a poking rod (157) is connected in the limiting groove (153) in a sliding mode, the top end of the poking rod (157) is fixedly connected with the bottom of the sliding plate (154), a cleaning brush (158) is fixedly connected to the bottom of the poking rod (157), a plurality of groups of water-spraying valves (159) are fixedly arranged at the bottom of the transverse plate (151), and the water-spraying valves (159) are communicated with an external mechanism with a water supply function through water pipes;

the device comprises a sliding plate (154), a driving rail (160) fixedly connected to the top of the sliding plate, a supporting seat (16) fixedly connected to the top of the transverse plate (151), a motor I (161) fixedly connected to the top of the supporting seat (16), a driving arm (162) fixedly connected to the output end of the motor I (161), a driving block (163) matched with the driving rail (160) and fixedly connected to the bottom of the driving arm (162), and a water storage tank (164) arranged at the bottom of the conveying belt (13).

2. The sand and stone screening device for building pouring according to claim 1, wherein a bevel gear I (804) is fixedly connected to the top of the grinding disc (801), sliding grooves (9) are symmetrically formed in the side wall of the receiving hopper (6), a support frame II (10) and a support frame III (11) are fixedly arranged on the inner side wall of the box I (2) through spot welding, a rotating shaft (12) is rotatably connected to the inner side of the support frame II (10), and a bevel gear II (805) meshed with the bevel gear I (804) is fixedly arranged at one end of the rotating shaft (12) in the box I (2) through spot welding;

the third supporting frame (11) is rotationally connected with a rotating rod, the top end of the rotating rod is fixedly connected with a dispersing plate (806), and the bottom end of the rotating rod is fixedly connected with a third bevel gear (807) which is meshed with the second bevel gear (805).

3. A sand and stone screening device for building pouring according to claim 2, wherein the second support frame (10), the third support frame (11) and the first support frame are all located in the chute (9), and a folding baffle (14) is fixedly connected between the first support frame, the second support frame (10), the third support frame (11) and the chute (9).

4. The sand and stone screening device for building pouring according to claim 3, wherein a motor II for driving a crushing roller (301) to rotate is installed on one side of the box II (3), a first rotating wheel (17) is sleeved at one end of the crushing roller (301) located outside the box II (3), a second spur gear is fixedly sleeved at one end of the crushing roller (301) located inside the box II (3), two spur gears are in meshed connection, a plurality of groups of second rotating wheels (18) are fixedly sleeved at one end of the rotating shaft (12) and the driving rod (809) located outside the box I (2), and the first rotating wheel (17) and the second rotating wheel (18) are connected through a belt (19).

5. A method of operating a sand screening device for building casting using a sand screening device for building casting according to any one of claims 1-4, comprising the steps of:

step one: the sand and stone mixed with soil passes through the feeding frame (4), the motor II drives the crushing roller (301) to rotate, and the two crushing rollers (301) with opposite directions primarily crush the sand and stone mixed with soil, so that sand and stone soil blocks with large gravel are crushed into Sha Danni soil blocks with small particles;

step two: the dispersing plate (806) opposite to the rotation direction of the grinding disc (801) utilizes centrifugal force to throw small-particle sand and soil blocks into a gap between the grinding disc (801) and the receiving hopper (6), the receiving hopper (6) is lifted under the cooperation of the driving convex block (810) and the driven block (808), the receiving hopper (6) carries the small-particle sand and soil blocks to move upwards until the small-particle Sha Danni soil blocks are contacted with the grinding roller (802) at the bottom of the grinding disc (801), the grinding roller (802) rotates along the inner wall of the receiving hopper (6), and the grinding roller (802) further grinds the small-particle sand and soil blocks while rotating, so that the small-particle sand and soil blocks are ground into sand and mud;

step three: the sand and the mud ash are transferred to the lower part of the water spraying valve (159) under the action of the conveyor belt (13) and still are continuously conveyed forwards, the water spraying valve (159) washes the sand and the mud ash on the surface of the conveyor belt (13), and meanwhile, the cleaning brush (158) which moves back and forth further cleans the sand and the mud ash on the surface of the conveyor belt (13), so that the mud ash in the sand and the stone is thoroughly cleaned, and the problem that the use is affected due to the fact that mud is contained in the sand and the stone is avoided.