Sand crushing method for constructional engineering

Abstract

The invention discloses a building engineering gravel crushing method, and belongs to the field of gravel crushing. A constructional engineering gravel crushing method comprises the following steps that firstly, crushing equipment is started, and after the crushing equipment works stably, to-be-crushed gravel is added into the crushing equipment; 2, after the gravel is added, the gravel can be smashed under the action of smashing equipment, and the gravel with the consistent size is discharged; thirdly, dust and the like generated during smashing can be adsorbed and concentrated, and the dust and the like are collected; 4, the adding speed of the gravel can be controlled according to the gravel retained in the crushing equipment; fifthly, vibration of the crushed gravel can be accelerated through the counterattack part in the gravel crushing process, the gravel discharging efficiency is improved, and meanwhile the gravel crushing efficiency is improved; the problems that the gravel feeding speed is inconvenient to adjust, adhesion and blockage are prone to occurring, the smashing efficiency is low, the effect is poor, and dust is inconvenient to treat can be solved.

Description

Technical Field

[0001] The invention relates to the technical field of sand and gravel crushing, and in particular to a method for crushing sand and gravel for construction engineering. Background Art

[0002] Construction sand and gravel refers to a loose mixture of sand and gravel, which is one of the basic materials in construction projects; sand and gravel is a common building material, widely used in houses, roads, highways, railways, engineering and other fields. Its main components include mineral debris (mainly quartz, feldspar) and rock debris, as well as cementing materials (such as calcium, silica, iron, mud, etc.); usually before use, construction sand and gravel need to be crushed into uniform and standard particle size specifications, which plays a vital role in the stability and durability of construction projects.

[0003] At present, when crushing construction sand and gravel, sand and gravel are usually directly added into the crushing equipment. During the crushing process, most of the time, the working condition of the equipment is observed and the feed amount of the equipment is adjusted, which makes the production efficiency of sand and gravel low, and some sand and gravel are easy to adhere and clog in the process of crushing, resulting in the decrease of sand and gravel crushing efficiency and output; at the same time, a large amount of dust will be generated, which will not only have an adverse effect on the equipment, but also affect the health of the staff and seriously pollute the atmospheric environment. If the dust is reduced by spraying water, it will not only cause a waste of water resources, but also seriously affect the crushing efficiency of sand and gravel, making the production cost of sand and gravel high. Summary of the invention

[0004] The purpose of the present invention is to solve the problems in the prior art that it is inconvenient to adjust the sand and gravel feeding speed, it is easy to adhere and clog, the crushing efficiency is low, the effect is poor, and it is inconvenient to handle dust, and a method for crushing sand and gravel for construction projects is proposed.

[0005] In order to achieve the above object, the present invention adopts the following technical solutions: A method for crushing sand and gravel in construction engineering, comprising the following steps: Step 1: Turn on the crushing equipment, and after the crushing equipment works stably, add the sand and gravel to be crushed into the crushing equipment; Step 2: After the sand and gravel are added, they will be crushed by the crushing equipment, and the sand and gravel of the right size will be discharged; Step 3: The dust generated during the crushing process will be concentrated and collected through adsorption; Step 4: The speed of adding sand and gravel can be controlled according to the sand and gravel retained inside the crushing equipment; Step 5: The counterattack part in the sand and gravel crushing process will accelerate the vibration of the sand and gravel after crushing, improve the discharge efficiency of the sand and gravel, and at the same time improve the crushing efficiency of the sand and gravel.

[0006] In order to facilitate the crushing of sand and gravel, preferably, the crushing equipment includes a casing, which is provided with a feed port and a discharge port, the outside of the casing is rotatably connected to a rotating shaft, and the rotating shaft is fixedly connected to a driving wheel and a crushing disk, wherein the feed port is located above the casing, the discharge port is located below the casing, the rotating shaft passes through the inside of the casing to the outside of the casing, the driving wheel is located outside the casing, and the crushing disk is located inside the casing.

[0007] In order to prevent sand and gravel from damaging the inside of the equipment and to facilitate monitoring of the amount of sand and gravel in the equipment, it further includes a side lining plate fixedly connected to the inner wall of the casing, a grate plate is provided on the side of the casing close to the crushing disk, a groove is provided on the side of the grate plate close to the side lining plate, and a positioning cylinder is fixedly connected to the side of the side lining plate close to the groove, wherein the grate plate is arranged in an arc shape on the side close to the crushing disk, the end of the positioning cylinder away from the side lining plate is connected to the groove, and the outer wall of the positioning cylinder is in contact with the inner wall of the groove.

[0008] In order to facilitate the screening of the crushed sand and gravel, further, a screening port is opened on one side of the grate plate below the crushing disk, and multiple groups of screening plates are fixedly connected inside the screening port. The screening port is located above the discharge port, and the gaps between the screening plates match the size of the finished sand and gravel.

[0009] In order to facilitate the handling of dust and reduce energy consumption, the casing further includes a fan fixedly connected to the outer wall of the casing, a suction port is provided on the side of the casing close to the fan, and a plurality of exhaust ports are provided on the side of the fan away from the casing, a pulley is connected to the side of the fan close to the driving wheel, and a belt is connected between the pulley and the driving wheel.

[0010] In order to facilitate the collection of dust and improve the crushing effect of sand and gravel, further, a dustproof plate is fixedly connected at an angle on the side of the interior of the casing close to the fan, and multiple groups of vibrating cylinders are fixedly connected between the dustproof plate and the grate plate and between the grate plate and the inner wall of the casing. Multiple groups of dust holes are opened on the side of the grate plate close to the dustproof plate, and a partition is fixedly connected to the inside of the discharge port, wherein the dustproof plate is arranged in an arc shape and is provided with multiple groups of through holes, the size of the through hole is smaller than the size of the dust hole, the size of the dust hole is smaller than the size of the finished sand and gravel, and the partition is located below the dust hole.

[0011] In order to prevent sand and gravel from causing damage to the inside of the equipment during the crushing process, and to reduce the adhesion and clogging of sand and gravel on the grate plate, it further includes a hinge fixedly connected to the inner wall of the casing, and an impact lining is rotatably connected to the hinge, and an impact spring is fixedly connected between the impact lining and the inner wall of the casing, and a driving cylinder is fixedly connected to the side of the casing close to the impact spring, wherein the hinge is located above the crushing disc, and the end of the driving cylinder away from the inner wall of the casing is in contact with the impact lining, and one group of the driving cylinders is connected to the vibration cylinder through a pipe.

[0012] In order to ensure the crushing efficiency of sand and gravel and reduce the ineffective movement of sand and gravel in the equipment, the side lining plates, grate plates and impact lining plates are respectively located around the crushing disk to form a sand and gravel crushing chamber. One end of the impact lining plate is close to one group of side lining plates, and there is a gap between the other end of the impact lining plate and the other group of side lining plates, and it is close to the feed port. The end of the impact lining plate close to the feed port is arranged in an arc shape.

[0013] In order to reduce the emission of dust from the equipment, it further includes a feed hopper fixedly connected to the side of the casing near the feed port, the feed hopper is connected to the interior of the casing through the feed port, and a baffle is rotatably connected to the side of the inner wall of the casing near the feed port, and the size of the baffle matches the size of the feed port.

[0014] In order to facilitate the adjustment of the feed amount of sand and gravel, further, an annular cylinder is fixedly connected to the side of the casing close to the baffle, an annular rod matching the annular cylinder is fixedly connected to the baffle, part of the annular rod extends to the interior of the annular cylinder, a supporting spring is fixedly connected between the annular rod and the annular cylinder, and a connecting hole is opened on the outer side wall of the annular cylinder, wherein the axis of the annular cylinder and the annular rod is located on the same straight line as the axis of rotation of the baffle, and the connecting hole is connected to the positioning cylinder through a pipeline.

[0015] Compared with the prior art, the present invention provides a method for crushing sand and gravel in construction engineering, which has the following beneficial effects: 1. The method for crushing sand and gravel for construction engineering can crush sand and gravel through crushing equipment. During the crushing process, the counterattack of sand and gravel can drive the grate plate to vibrate, thereby accelerating the discharge of sand and gravel, while reducing the adhesion and blockage of sand and gravel on the grate plate, thereby improving the crushing efficiency and output of sand and gravel, and can reduce the residence time of sand and gravel in the equipment, thereby improving the crushing effect of sand and gravel.

[0016] 2. The sand and gravel crushing method for construction projects can drive the fan to run through the crushing equipment, absorb the dust in the equipment, and intercept the dust through the dustproof plate. On the one hand, it can reduce the impact of dust on the fan, and on the other hand, it can collect dust for reuse. It not only realizes the recycling of sand and gravel resources and improves the utilization rate of resources, but also reduces damage to the environment.

[0017] 3. The sand and gravel crushing method for construction projects can intercept the dust in the equipment through the baffle, and can also adjust the opening of the baffle according to the weight of the sand and gravel on the grate plate, thereby automatically adjusting the feed amount of sand and gravel, and further improving the crushing efficiency of sand and gravel.

[0018] The parts not involved in the device are the same as the existing technology or can be implemented by using the existing technology. The present invention can overcome the problems of inconvenience in adjusting the sand and gravel feeding speed, easy adhesion and clogging, low crushing efficiency, poor effect, and inconvenience in handling dust. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 The present invention is a structural schematic diagram of a method for crushing sand and gravel for construction projects.

[0020] Figure 2 The present invention is a schematic diagram of the cross-sectional structure of a method for crushing sand and gravel for construction engineering.

[0021] Figure 3 The present invention is a schematic structural diagram of a grate plate in a method for crushing sand and gravel in construction engineering.

[0022] Figure 4 The present invention is a schematic diagram of the cross-sectional structure of an annular cylinder and annular rods in a method for crushing sand and gravel in construction engineering.

[0023] Figure 5 A method for crushing sand and gravel for construction engineering proposed by the present invention Figure 2 Schematic diagram of the local structure in.

[0024] Figure 6 A method for crushing sand and gravel for construction engineering proposed by the present invention Figure 2 Schematic diagram of the structure of part A.

[0025] Figure 7 A method for crushing sand and gravel for construction engineering proposed by the present invention Figure 2 Schematic diagram of the structure of part B.

[0026] In the figure: 1, casing; 2, feed port; 3, feed hopper; 4, discharge port; 5, partition; 6, rotating shaft; 7, driving wheel disc; 8, crushing disc; 9, side lining plate; 10, grate plate; 11, groove; 12, positioning cylinder; 13, screening port; 14, screening plate; 15, dust hole; 16, dust plate; 17, vibration cylinder; 18, air extraction port; 19, fan; 20, exhaust port; 21, pulley; 22, belt ; 23. Hinge; 24. Counter-attack lining; 25. Counter-attack spring; 26. Driving cylinder; 27. Baffle; 28. Annular cylinder; 29. ​​Annular rod; 30. Support spring; 31. Connecting hole; 32. Connecting channel; 33. Nozzle; 34. Air storage box; 35. Connecting pipe; 36. Pneumatic valve; 37. Inlet pipe; 38. Boost pipe; 39. One-way valve; 40. Slope; 41. Mounting groove; 42. Starting cylinder. DETAILED DESCRIPTION

[0027] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0028] In the description of the present invention, it is necessary to understand that the terms "upper", "lower", "front", "back", "left", "right", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship are based on the orientation or position relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention. Example

[0029] Reference Figure 1-Figure 6 , a method for crushing sand and gravel in construction engineering, comprising the following steps: Step 1: Turn on the crushing equipment, and after the crushing equipment works stably, add the sand and gravel to be crushed into the crushing equipment; Reference Figure 1-Figure 2 The crushing equipment includes a casing 1, which is provided with a feed port 2 and a discharge port 4. The outside of the casing 1 is rotatably connected with a rotating shaft 6, and the rotating shaft 6 is fixedly connected with a driving wheel disc 7 and a crushing disc 8. The feed port 2 is located above the casing 1, and the discharge port 4 is located below the casing 1. The rotating shaft 6 passes through the inside of the casing 1 to the outside of the casing 1, the driving wheel disc 7 is located outside the casing 1, and the crushing disc 8 is located inside the casing 1.

[0030] It should be explained that the driving wheel 7 is driven by an external motor, and the crushing disk 8 includes a rotor and a hammer. After sand and gravel are added into the casing 1, the driving wheel 7 drives the crushing disk 8 to rotate, and the sand and gravel are crushed by the impact of the hammer with the sand and gravel.

[0031] Reference Figure 2 and Figure 6 , and also includes a side liner 9 fixedly connected to the inner wall of the casing 1, a grate plate 10 is provided on the side of the casing 1 close to the crushing disk 8, a groove 11 is provided on the side of the grate plate 10 close to the side liner 9, and a positioning cylinder 12 is fixedly connected to the side of the side liner 9 close to the groove 11, wherein the side of the grate plate 10 close to the crushing disk 8 is arranged in an arc shape, and the end of the positioning cylinder 12 away from the side liner 9 is connected to the groove 11, and the outer wall of the positioning cylinder 12 is in contact with the inner wall of the groove 11.

[0032] The side of the side lining plate 9 close to the crushing disk 8 is concave and convex, which can play a good counterattack effect on the sand and gravel during the crushing process, thereby improving the stability of the equipment operation. When the grate plate 10 moves, it will move along the direction of the positioning cylinder 12, and at the same time drive the positioning cylinder 12 to extend or contract. It should be explained that the compression chamber of the positioning cylinder 12 is located near the active end, that is, when the positioning cylinder 12 extends, the gas is compressed, and when the positioning cylinder 12 contracts, the gas is extracted.

[0033] Step 2: After the sand and gravel are added, they will be crushed by the crushing equipment, and the sand and gravel of the right size will be discharged; Reference Figure 2 and Figure 3 A screening opening 13 is provided on one side of the grate plate 10 below the crushing disk 8, and a plurality of screening plates 14 are fixedly connected inside the screening opening 13. The screening opening 13 is located above the discharge opening 4, and the gaps between the screening plates 14 match the size of the finished sand and gravel.

[0034] The crushed sand and gravel will fall onto the grate plate 10. If the size of the crushed sand and gravel meets the standard, it can fall out of the casing 1 through the screening plate 14. If the size of the crushed sand and gravel does not meet the standard, it will stay on the grate plate 10, and when the grate plate 10 vibrates, the sand and gravel will be vibrated again to the crushing disk 8 for further crushing. At the same time, it can prevent sand and gravel from adhering to and clogging the grate plate 10 and the screening plate 14, thereby improving the crushing efficiency and effect of sand and gravel.

[0035] Step 3: The dust generated during the crushing process will be concentrated and collected through adsorption; Reference Figure 1-Figure 2 , and also includes a fan 19 fixedly connected to the outer wall of the casing 1, a suction port 18 is provided on the side of the casing 1 close to the fan 19, and a plurality of exhaust ports 20 are provided on the side of the fan 19 away from the casing 1, a pulley 21 is connected to the side of the fan 19 close to the driving wheel 7, and a belt 22 is sleeved between the pulley 21 and the driving wheel 7.

[0036] The specific structure of the fan 19 can refer to the technical solutions in the prior art. Those skilled in the art will know that it will not be elaborated here. When the driving wheel 7 is driven to rotate by the motor, the belt 22 will drive the pulley 21 to rotate, thereby driving the fan 19 to run (it should be explained that the input end of the fan 19 is connected to the pulley 21), adsorbing the dust inside the casing 1, and discharging the gas from the casing 1, while the air from the outer shell can enter the casing 1 through the feed port 2. The flow of air can also cool the equipment inside the casing 1, thereby reducing the impact of heat generated by sand and gravel during the crushing process on the equipment.

[0037] Reference Figure 2-Figure 3 A dustproof plate 16 is fixedly connected to the casing 1 at an angle on one side near the fan 19. Multiple groups of vibrating cylinders 17 are fixedly connected between the dustproof plate 16 and the grate plate 10 and between the grate plate 10 and the inner wall of the casing 1. Multiple groups of dust holes 15 are provided on one side of the grate plate 10 near the dustproof plate 16. A partition plate 5 is fixedly connected to the inside of the discharge port 4, wherein the dustproof plate 16 is arranged in an arc shape and is provided with multiple groups of through holes, the size of the through holes is smaller than the size of the dust holes 15, the size of the dust holes 15 is smaller than the size of the finished sand and gravel, and the partition plate 5 is located below the dust holes 15.

[0038] When the air inside the casing 1 flows, the dust and air generated in the sand and gravel crushing process will first flow to the dustproof plate 16 through the dust hole 15. The dustproof plate 16 is arranged in an arc shape. During this process, the dustproof plate 16 can intercept the dust, and when the grate plate 10 vibrates, the dustproof plate 16 is driven to vibrate by the vibrating cylinder 17, so that the dust adsorbed on the dustproof plate 16 falls to the bottom, and under the action of the partition 5, the dust and the finished sand and gravel can be separated and collected. On the one hand, it can reduce the amount of dust in the finished sand and gravel products, and it can also facilitate the subsequent reuse of dust, improve the utilization rate of sand and gravel resources, and reduce the pollution of dust to the environment.

[0039] Step 4: The speed of adding sand and gravel can be controlled according to the sand and gravel retained inside the crushing equipment; Reference Figure 1 , Figure 2 and Figure 4, also includes a feed hopper 3 fixedly connected to the side of the casing 1 near the feed port 2, the feed hopper 3 is connected to the inside of the casing 1 through the feed port 2, a baffle 27 is rotatably connected to the side of the inner wall of the casing 1 near the feed port 2, the size of the baffle 27 matches the size of the feed port 2, an annular cylinder 28 is fixedly connected to the side of the casing 1 near the baffle 27, an annular rod 29 matching the annular cylinder 28 is fixedly connected to the baffle 27, a part of the annular rod 29 extends to the inside of the annular cylinder 28, a supporting spring 30 is fixedly connected between the annular rod 29 and the annular cylinder 28, a connecting hole 31 is opened on the outer side wall of the annular cylinder 28, wherein the axis of the annular cylinder 28 and the annular rod 29 is on the same straight line as the axis of rotation of the baffle 27, and the connecting hole 31 is connected to the positioning cylinder 12 through a pipeline.

[0040] Initially, the baffle 27, under the action of the annular tube 28, the annular rod 29 and the supporting spring 30, blocks the feed port 2 and can support part of the sand and gravel. When the amount of sand and gravel on the grate plate 10 is large, that is, when the amount of sand and gravel added is fast, although the grate plate 10 is still vibrating, it will vibrate at a lower position, so that the baffle 27 vibrates at a higher angle, that is, the opening of the feed port 2 is smaller, thereby reducing the feeding speed of the sand and gravel, and achieving the effect of controlling the sand and gravel feeding amount. On the contrary, when there is less sand and gravel on the grate plate 10, the opening of the feed port 2 is increased by the baffle 27, while ensuring the sand and gravel crushing effect, the sand and gravel crushing efficiency is improved.

[0041] Step 5: The counterattack part in the sand and gravel crushing process will accelerate the vibration of the sand and gravel after crushing, improve the discharge efficiency of the sand and gravel, and at the same time improve the crushing efficiency of the sand and gravel.

[0042] Reference Figure 2 and Figure 5 , and also includes a hinge 23 fixedly connected to the inner wall of the casing 1, and an impact lining 24 is rotatably connected to the hinge 23, and an impact spring 25 is fixedly connected between the impact lining 24 and the inner wall of the casing 1, and a driving cylinder 26 is fixedly connected to the side of the casing 1 close to the impact spring 25, wherein the hinge 23 is located above the crushing disk 8, and the end of the driving cylinder 26 away from the inner wall of the casing 1 is in contact with the impact lining 24, and one group of driving cylinders 26 is connected to the vibration cylinder 17 through a pipeline, and the side linings 9, the grate plates 10 and the impact linings 24 are respectively located around the crushing disk 8 to form a sand and gravel crushing chamber, one end of the impact lining 24 is close to one group of side linings 9, and there is a gap between the other end of the impact lining 24 and the other group of side linings 9, and is close to the feed port 2, and the end of the impact lining 24 close to the feed port 2 is arranged in an arc shape.

[0043] During the sand and gravel crushing process, some of the sand and gravel that do not meet the crushing standards will continue to rotate with the crushing disk 8, and will hit the impact lining 24. Since the crushing disk 8 rotates at a high speed, the impact force of the sand and gravel when hitting the impact lining 24 is relatively large. Under the action of the impact spring 25, the impact lining 24 is driven to vibrate, thereby driving the grate plate 10 to vibrate through the driving cylinder 26 and the vibration cylinder 17. In addition, when the impact lining 24 vibrates, it can also accelerate the contact between the sand and gravel and the crushing disk 8, improve the subsequent sand and gravel crushing efficiency, and avoid the collision of sand and gravel with the baffle 27, thereby ensuring the stability of sand and gravel crushing. Example

[0044] Reference Figure 2 , Figure 4 and Figure 7 , a method for crushing sand and gravel in construction engineering, which is basically the same as the first embodiment, and further, a connecting channel 32 and a nozzle 33 are provided on the dustproof plate 16, and an air storage box 34 is fixedly connected to the side of the casing 1 close to the dustproof plate 16, and a connecting pipe 35 is connected between the air storage box 34 and the connecting channel 32, and a pneumatic valve 36 is provided on the connecting pipe 35, and an air intake pipe 37 is connected between the air storage box 34 and the exhaust port 20, and a boost pipe 38 is connected to the air storage box 34, and a one-way valve 39 is provided on the boost pipe 38. It should be noted that in this embodiment, the connecting channel 32 and the through hole on the dustproof plate 16 are in a vertical state, the nozzle 33 is inclined, and the nozzle 33 is connected to the through hole and the connecting channel 32, and the end of the boost pipe 38 away from the air storage box 34 is connected to one of the driving cylinders 26; It also includes a slope 40 opened on one end of the annular rod 29 close to the annular tube 28, and a mounting groove 41 is opened on the inner wall of the annular tube 28. A starting cylinder 42 is fixedly connected to the inside of the mounting groove 41, wherein the starting cylinder 42 is connected to the pneumatic valve 36, and the starting cylinder 42 is inclined near the side of the annular rod 29.

[0045] In this embodiment, when the fan 19 is exhausting air, part of the gas will enter the air storage box 34 through the air inlet pipe 37. In addition, when the flying sand and gravel drive the counter-attack liner 24 to vibrate, the gas compressed by one group of driving cylinders 26 will enter the air storage box 34 through the booster pipe 38, so that the air pressure in the air storage box 34 is greater than the air pressure generated when the fan 19 is exhausting air. When the grate plate 10 vibrates, the shape of the dust plate 16 will change. When the dust plate 16 vibrates downward, the opening of the through hole close to the side of the grate plate 10 is reduced, and when the dust plate 16 vibrates upward, the through hole is away from the side of the grate plate 10. The opening on one side of the grate plate 10 is enlarged, that is, the air extraction volume is reduced at this time, and at the same time the annular rod 29 moves into the annular tube 28, and compresses the starting cylinder 42 through the slope 40, and the compressed gas enters the pneumatic valve 36, so that the gas in the air storage box 34 enters the connecting channel 32 through the connecting pipe 35, and is sprayed into the through hole on the dustproof plate 16 by the nozzle 33, and the dust adhering to the through hole of the dustproof plate 16 is sprayed out to avoid the dustproof plate 16 from being blocked during use, thereby improving the dust reduction effect during the sand and gravel crushing process and ensuring the normal operation of the equipment.

[0046] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A method for crushing sand and gravel for construction engineering, characterized in that: The steps include: Step 1: Turn on the crushing equipment, and after the crushing equipment works stably, add the sand and gravel to be crushed into the crushing equipment; Step 2: After the sand and gravel are added, they will be crushed by the crushing equipment, and the sand and gravel of the right size will be discharged; Step 3: The dust generated during the crushing process will be concentrated and collected through adsorption; Step 4: The speed of adding sand and gravel can be controlled according to the sand and gravel retained inside the crushing equipment; Step 5: The counterattack part in the sand and gravel crushing process will accelerate the vibration of the sand and gravel after crushing, improve the discharge efficiency of the sand and gravel, and at the same time improve the crushing efficiency of the sand and gravel.

2. A method for crushing sand and gravel for construction engineering according to claim 1, characterized in that: The pulverizing device comprises a casing (1), the casing (1) being provided with a feed inlet (2) and a discharge inlet (4), the casing (1) being rotatably connected to an outer portion of a rotating shaft (6), the rotating shaft (6) being fixedly connected to a driving wheel disc (7) and a pulverizing disc (8), The feed port (2) is located above the casing (1), the discharge port (4) is located below the casing (1), the rotating shaft (6) passes through from the inside of the casing (1) to the outside of the casing (1), the driving wheel (7) is located outside the casing (1), and the crushing disc (8) is located inside the casing (1).

3. A method for crushing sand and gravel for construction engineering according to claim 2, characterized in that: It also includes a side lining plate (9) fixedly connected to the inner side wall of the casing (1); a grate plate (10) is provided on a side of the casing (1) close to the crushing disc (8); a groove (11) is provided on a side of the grate plate (10) close to the side lining plate (9); a positioning cylinder (12) is fixedly connected to a side of the side lining plate (9) close to the groove (11); The grate plate (10) is arranged in an arc shape on a side close to the crushing disc (8), the end of the positioning cylinder (12) away from the side lining plate (9) is connected to the groove (11), and the outer wall of the positioning cylinder (12) is in contact with the inner wall of the groove (11).

4. A method for crushing sand and gravel for construction engineering according to claim 3, characterized in that: A screening opening (13) is provided on one side of the grate plate (10) below the crushing disc (8), and a plurality of groups of screening plates (14) are fixedly connected inside the screening opening (13). The screening opening (13) is located above the discharge opening (4), and the gaps between the screening plates (14) match the size of the finished sand and gravel.

5. A method for crushing sand and gravel for construction engineering according to claim 3, characterized in that: It also includes a fan (19) fixedly connected to the outer wall of the casing (1), a suction port (18) is provided on a side of the casing (1) close to the fan (19), a plurality of exhaust ports (20) are provided on a side of the fan (19) away from the casing (1), a belt pulley (21) is connected to a side of the fan (19) close to the driving wheel disc (7), and a belt (22) is sleeved between the belt pulley (21) and the driving wheel disc (7).

6. A method for crushing sand and gravel for construction engineering according to claim 5, characterized in that: A dustproof plate (16) is fixedly connected in an inclined manner to a side of the casing (1) near the fan (19); multiple groups of vibrating cylinders (17) are fixedly connected between the dustproof plate (16) and the grate plate (10) and between the grate plate (10) and the inner wall of the casing (1); multiple groups of dust holes (15) are provided on a side of the grate plate (10) near the dustproof plate (16); a partition plate (5) is fixedly connected to the inside of the discharge port (4); The dustproof plate (16) is arranged in an arc shape and is provided with a plurality of through holes, the size of the through holes is smaller than the size of the dust holes (15), the size of the dust holes (15) is smaller than the size of the finished sand and gravel, and the partition plate (5) is located below the dust holes (15).

7. A method for crushing sand and gravel for construction engineering according to claim 6, characterized in that: It also includes a hinge (23) fixedly connected to the inner wall of the casing (1), a counter-attack lining (24) being rotatably connected to the hinge (23), a counter-attack spring (25) being fixedly connected between the counter-attack lining (24) and the inner wall of the casing (1), and a driving cylinder (26) being fixedly connected to a side of the casing (1) close to the counter-attack spring (25). The hinge (23) is located above the crushing disc (8), one end of the driving cylinder (26) away from the inner wall of the casing (1) is in contact with the impact liner (24), and one group of the driving cylinders (26) is connected to the vibration cylinder (17) via a pipeline.

8. A method for crushing sand and gravel for construction engineering according to claim 7, characterized in that: The side lining plates (9), the grate plates (10) and the impact lining plates (24) are respectively located around the crushing disc (8) to form a sand and gravel crushing chamber. One end of the impact lining plate (24) is close to one of the groups of side lining plates (9). There is a gap between the other end of the impact lining plate (24) and the other group of side lining plates (9) and is close to the feed port (2). The end of the impact lining plate (24) close to the feed port (2) is arranged in an arc shape.

9. A method for crushing sand and gravel for construction engineering according to claim 3, characterized in that: It also includes a feed hopper (3) fixedly connected to the side of the casing (1) close to the feed inlet (2), the feed hopper (3) being connected to the interior of the casing (1) through the feed inlet (2), and a baffle (27) being rotatably connected to the side of the inner wall of the casing (1) close to the feed inlet (2), the size of the baffle (27) matching the size of the feed inlet (2).

10. A method for crushing sand and gravel for construction engineering according to claim 9, characterized in that: An annular cylinder (28) is fixedly connected to one side of the housing (1) close to the baffle (27); an annular rod (29) matching the annular cylinder (28) is fixedly connected to the baffle (27); a portion of the annular rod (29) extends into the interior of the annular cylinder (28); a supporting spring (30) is fixedly connected between the annular rod (29) and the annular cylinder (28); and a communication hole (31) is provided on the outer wall of the annular cylinder (28). The axes of the annular cylinder (28) and the annular rod (29) are located on the same straight line as the axis of rotation of the baffle (27), and the connecting hole (31) is connected to the positioning cylinder (12) via a pipeline.

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