Green and environment-friendly gravel aggregate production line system

Abstract

The utility model relates to the technical field of sandstone aggregate production, and discloses an environment-friendly sandstone aggregate production line system, which is characterized in that a crushing device is used for crushing sandstone aggregate into sandstone aggregate particles meeting the standard, and ensures that raw materials of the sandstone aggregate are crushed to the required particle size by accurately controlling the crushing process. The sand aggregate particles which do not meet the standard are avoided, so that the secondary crushing step is avoided, the production process is simplified, the energy consumption in the production process is reduced, and the crushing efficiency and the cost benefit are improved. The conveying mechanism can convey crushed gravel aggregate particles into the stone washing device to be washed, and humidification and dust suppression devices are arranged on the two sides of the conveying belt. The humidification and dust suppression device can spray water to the belt face of the conveying belt so as to spray water to gravel aggregate particles conveyed on the belt face of the conveying belt, and water drops make contact with stone powder in the gravel aggregate particles so that the gravel aggregate particles can be wetted. And the wetted stone powder is not easy to be sealed and blown up, so that the generation of flying dust is effectively reduced.

Description

Technical Field

[0001] This utility model relates to the technical field of sand and gravel aggregate production, specifically to a green and environmentally friendly sand and gravel aggregate production line system. Background Technology

[0002] Sand and gravel aggregate production lines typically use natural sand and gravel or ores as raw materials. The production process begins with crushing the raw materials into the required particle size. Next, the crushed aggregate particles are screened to select those that meet the size requirements. If any aggregate particles exceeding the standard size are found during screening, they must be crushed again until the specified particle size is achieved. The screened aggregate particles may contain impurities such as mud and dust, requiring them to be transported to a stone washing machine for cleaning to remove these impurities. The cleaned aggregate material contains a certain amount of moisture. To ensure the quality and stability of the aggregate, it needs to be dried. The dried aggregate must be properly stored for later use; the storage area should be kept dry and well-ventilated to prevent moisture or contamination.

[0003] The secondary crushing step after screening adds an extra crushing process, prolonging the crushing time and thus reducing overall crushing efficiency while increasing production costs. Furthermore, the crushing process generates a large amount of stone dust. During the transport of the screened sand and gravel aggregate to the stone washing machine, this stone dust is dispersed into the air, creating dust pollution that impacts human health and the environment. Utility Model Content

[0004] The present invention aims to provide a green and environmentally friendly sand and gravel aggregate production line system that can avoid dust generation while improving crushing efficiency and cost-effectiveness.

[0005] To achieve the above objectives, the present invention adopts the following technical solution:

[0006] 1) A green and environmentally friendly sand and gravel aggregate production line system, comprising:

[0007] The crushing device is configured to crush sand and gravel aggregates into standard sand and gravel aggregate particles.

[0008] The stone washing device is configured to remove impurities and soil from the surface of crushed sand and gravel aggregate particles.

[0009] The drying device is configured to dry the surface moisture of sand and gravel aggregate particles after cleaning.

[0010] A conveying mechanism is provided between the crushing device and the stone washing device. The conveying mechanism includes a conveyor belt, and humidification and dust suppression mechanisms for spraying water onto the surface of the conveyor belt are provided on both sides of the conveyor belt.

[0011] In this invention, the crushing device is used to crush sand and gravel aggregates into standard-compliant aggregate particles. By precisely controlling the crushing process, it ensures that the raw materials are crushed to the required particle size. This avoids the production of substandard aggregate particles, eliminating the need for secondary crushing, simplifying the production process, and reducing energy consumption, thereby improving crushing efficiency and cost-effectiveness. The crushed aggregate particles are then conveyed to a washing device to remove impurities and dirt from their surface. The washing device effectively removes dirt, dust, and other impurities from the surface of the aggregate particles through the impact of water flow, ensuring cleanliness and improving the quality of the aggregate particles to better meet the requirements of construction, road, and other engineering projects. Furthermore, it prevents secondary pollution from dirt, dust, and other impurities on the surface of the aggregate particles during subsequent processing or use. The washed aggregate particles are then conveyed to a drying device to dry the surface moisture. The dried surface of the sand and gravel aggregate particles reduces the impact of moisture on their properties, thereby improving their quality. Secondly, it extends the storage time of the sand and gravel aggregate particles and prevents problems such as clumping and mold growth caused by moisture.

[0012] The conveying mechanism transports crushed sand and gravel aggregate particles to a washing unit for cleaning. Humidifying dust suppression devices are installed on both sides of the conveyor belt. These devices spray water onto the conveyor belt surface, thus wetting the sand and gravel aggregate particles transported on it. The water droplets come into contact with the stone powder within the particles, making them less susceptible to being blown away, effectively reducing dust generation.

[0013] The crushing device includes a housing, which contains a first chamber for crushing larger sand and gravel aggregate particles and a second chamber for crushing smaller sand and gravel aggregate particles. The top of the housing has a feed inlet, and the bottom of the housing has a first discharge outlet. A first crushing mechanism is located inside the feed inlet. Below the first crushing mechanism is a screen plate, which is inclined towards the top of the first chamber. A second crushing mechanism is located inside the first chamber, and a second discharge outlet is located at the bottom of the first chamber. A third crushing mechanism is located inside the second discharge outlet. The surface of the screen plate faces the top of the second chamber, and a third discharge outlet is located at the bottom of the second chamber. A fourth crushing mechanism is located inside the third discharge outlet.

[0014] In this invention, a first crushing mechanism is provided inside the feed inlet for preliminary crushing of the sand and gravel aggregate particles. Below the first crushing mechanism is an inclined screen plate for screening the pre-crushed particles. The screen plate faces the top of the second chamber, allowing smaller particles to pass through and directly enter the second chamber. These smaller particles then fall naturally to the bottom of the second chamber and are discharged through a third outlet at the bottom. A fourth crushing mechanism is located inside the third outlet to further crush these smaller particles to the required size. After crushing by the fourth mechanism, the sand and gravel aggregate particles reach the required size. These sized particles then naturally slide to the bottom of the housing and are finally discharged through the first outlet at the bottom of the housing.

[0015] Meanwhile, the screen plate is inclined towards the top of the first chamber. Larger sand and gravel aggregate particles cannot pass through the screen holes on the screen plate. These larger particles slide along the inclined screen plate and eventually fall into the first chamber. Next, these larger particles will be crushed by the second crushing mechanism in the first chamber into smaller particles. Subsequently, these smaller particles will fall naturally to the bottom of the first chamber and be discharged through the second discharge port at the bottom of the first chamber. The second discharge port is equipped with a third crushing mechanism to further crush these smaller particles to the required size. After being crushed by the third crushing mechanism, the sand and gravel aggregate particles reach the required size standard. These size-compliant sand and gravel aggregate particles will then fall naturally to the bottom of the box and finally be discharged from the box through the first discharge port at the bottom of the box.

[0016] By screening the sand and gravel aggregate particles after initial crushing, the screened particles automatically enter a targeted continuous crushing step. This method ensures that the sand and gravel aggregate particles meet consistent size and quality standards, while improving crushing efficiency and cost-effectiveness.

[0017] 3) Based on 2), a green and environmentally friendly sand and gravel aggregate production line system is obtained, wherein:

[0018] The bottom of the screen plate is equipped with a vibrator, and several shock-absorbing springs are embedded at the connection between the inner wall of the box and the screen plate. The screen plate is fixedly connected to each shock-absorbing spring.

[0019] In this invention, a vibrator is installed at the bottom of the screen plate. The vibrator causes the screen plate to vibrate, and the sand and gravel aggregate particles on the screen plate are subjected to vibration. This vibration causes the sand and gravel aggregate particles to bounce and fall repeatedly on the screen plate, allowing smaller sand and gravel aggregate particles to pass through the screen holes quickly. At the same time, it causes larger sand and gravel aggregate particles to move quickly towards the inclined end of the screen plate, thereby improving screening efficiency. Secondly, this vibration can prevent sand and gravel aggregate particles from clogging in the screen holes and accumulating on the screen plate. In addition, shock-absorbing springs are embedded at the connection between the inner wall of the box and the screen plate, and the screen plate is fixedly connected to the shock-absorbing springs. When the screen plate vibrates, the shock-absorbing springs can absorb the vibration and the impact force generated when sand and gravel aggregate particles hit the screen plate, ensuring that the vibration and impact force are not directly transmitted to the box structure, thereby avoiding damage to the box structure.

[0020] 4) Based on 2), a green and environmentally friendly sand and gravel aggregate production line system is obtained, wherein:

[0021] A partition plate is provided between the first chamber and the second chamber. A first hopper is provided at the bottom of the first chamber, and the cross-section of the first hopper is inverted trapezoidal. A second hopper is provided at the bottom of the second chamber, and the cross-section of the second hopper is inverted trapezoidal. The bottom of the partition plate is connected to the top edge of the first hopper and the top edge of the second hopper, respectively.

[0022] In this invention, a partition plate is provided between the first chamber and the second chamber to separate them. This ensures that smaller sand and gravel aggregate particles, after screening, accurately fall into the second chamber, while larger particles accurately fall into the first chamber, preventing mixing of the aggregate particles upon entering the chambers and thus affecting the subsequent crushing effect. Secondly, a first hopper is provided at the bottom of the first chamber to collect the sand and gravel aggregate particles after crushing by the second crushing mechanism. The first hopper has an inverted trapezoidal cross-section, allowing the aggregate particles to move quickly to the bottom of the hopper, preventing them from adhering to the side walls. Similarly, a second hopper is provided at the bottom of the second chamber to collect the aggregate particles that have passed through the screen plate. The second hopper also has an inverted trapezoidal cross-section, allowing the aggregate particles to move quickly to the bottom of the hopper, preventing them from adhering to the side walls.

[0023] 5) A green and environmentally friendly sand and gravel aggregate production line system is obtained according to 2), wherein:

[0024] The first crushing mechanism includes two first crushing rollers rotating in opposite directions, and the second crushing mechanism includes two second crushing rollers rotating in opposite directions. The surfaces of the first crushing rollers and the second crushing rollers are each provided with several first crushing teeth. The first crushing rollers and the second crushing rollers are the same size.

[0025] The third crushing mechanism includes two third crushing rollers that rotate in opposite directions, and the fourth crushing mechanism includes two fourth crushing rollers that rotate in opposite directions. The surfaces of the third crushing rollers and the fourth crushing rollers are each provided with several second crushing teeth, and the third crushing rollers and the fourth crushing rollers are of the same size.

[0026] In this invention, the first crushing mechanism includes two opposing crushing rollers. When sand and gravel particles pass between the two rollers, the opposing rollers compress the particles, causing them to break. The two rollers are of the same size and rotate in opposite directions, ensuring uniform pressure on the particles and resulting in more uniform crushing. Similarly, the second crushing mechanism includes two opposing crushing rollers. When sand and gravel particles pass between the two rollers, the opposing rollers compress them, causing them to break. The two rollers are also of the same size and rotate in opposite directions, ensuring uniform pressure on the particles during crushing and resulting in more uniform crushing.

[0027] Secondly, the first crushing roller and the second crushing roller are the same size, so that the smaller sand and gravel particles produced by the first crushing roller and the sand and gravel particles produced by the second crushing roller are consistent in size. Then these sand and gravel particles enter the next crushing stage, thereby ensuring the uniformity of the sand and gravel particles after final crushing.

[0028] Furthermore, several first crushing teeth are evenly distributed on the surfaces of the first and second crushing rollers. When sand and gravel particles enter the first and second crushing rollers, they first come into contact with the first crushing teeth. When the sand and gravel particles contact the first crushing teeth, their sharp teeth can effectively perform preliminary crushing treatment on the sand and gravel particles. Secondly, the first crushing teeth can penetrate deep into the interior of the sand and gravel particles, firmly clamping the sand and gravel particles between the first crushing teeth. This prevents the sand and gravel particles from sliding or falling off during the crushing process. Under the clamping of the first crushing teeth, the sand and gravel particles will move between the two crushing rollers for further crushing. The first crushing teeth can maintain the stability of the crushing process, thereby improving the crushing efficiency.

[0029] The third crushing mechanism includes two counter-rotating crushing rollers. As sand and gravel particles pass between these rollers, the opposing rollers compress the particles, causing them to break. The two rollers are of the same size and rotate in opposite directions, ensuring uniform pressure on the particles during crushing, resulting in more uniform particle breakage. Similarly, the fourth crushing mechanism includes two counter-rotating crushing rollers. As sand and gravel particles pass through the screen plate between these rollers, the opposing rollers compress the particles, causing them to break. The two rollers are also of the same size and rotate in opposite directions, ensuring uniform pressure on the particles during crushing, resulting in more uniform particle breakage.

[0030] Secondly, the third and fourth crushing rollers are of the same size, ensuring consistent particle size of the sand and gravel particles produced after crushing, thus guaranteeing the uniformity of the final crushed particles. Furthermore, the surfaces of the third and fourth crushing rollers are evenly distributed with several second crushing teeth. When sand and gravel particles enter the third and fourth crushing rollers, they first come into contact with these second crushing teeth. The sharp teeth effectively perform initial crushing of the sand and gravel particles. Secondly, the second crushing teeth penetrate deep into the sand and gravel particles, firmly clamping them between the teeth. This prevents the sand and gravel particles from slipping or falling off during the crushing process. Under the clamping of the second crushing teeth, the sand and gravel particles move between the two crushing rollers for further crushing. The second crushing teeth maintain the stability of the crushing process, thereby improving crushing efficiency.

[0031] 6) A green and environmentally friendly sand and gravel aggregate production line system is obtained according to 5), wherein:

[0032] In the first crushing mechanism, a first rotating shaft is coaxially inserted into each of the two first crushing rollers. One end of each first rotating shaft passes through the housing and is fitted with a first gear. The two first gears mesh, and one of the first rotating shafts is coaxially connected to a first servo motor.

[0033] The second crushing mechanism has two second crushing rollers coaxially connected to a second rotating shaft. One end of each second rotating shaft passes through the housing and is fitted with a second gear. The two second gears mesh, and one of the second rotating shafts is coaxially connected to a second servo motor.

[0034] The third crushing mechanism has two third crushing rollers coaxially connected to a third rotating shaft. One end of each third rotating shaft passes through the housing and is fitted with a third gear. The two third gears mesh, and one of the third rotating shafts is coaxially connected to a third servo motor.

[0035] The fourth crushing mechanism has a fourth rotating shaft coaxially inserted in each of the two fourth crushing rollers. One end of each fourth rotating shaft passes through the housing and is fitted with a fourth gear. The two fourth gears mesh, and one of the fourth rotating shafts is coaxially connected to a fourth servo motor.

[0036] In this invention, starting the first servo motor drives the first rotating shaft coaxially connected to it to rotate. Simultaneously, the first gear on the first rotating shaft also rotates. Since the two first gears mesh with each other, the rotation of one first gear drives the other to rotate in the opposite direction. The two first gears can rotate in opposite directions, thereby driving the two first rotating shafts to rotate in opposite directions, which in turn drives the two first crushing rollers to rotate in opposite directions, thus achieving the crushing of sand and gravel.

[0037] By activating the second servo motor, the second rotating shaft coaxially connected to it is driven to rotate. Simultaneously, the second gear on the second rotating shaft also rotates. Since the two second gears mesh with each other, the rotation of one second gear drives the other to rotate in the opposite direction. The two second gears can rotate in opposite directions, which in turn drives the two second rotating shafts to rotate in opposite directions, thereby driving the two second crushing rollers to rotate in opposite directions, thus achieving the crushing of sand and gravel.

[0038] By activating the third servo motor, the third rotating shaft coaxially connected to it is driven to rotate. Simultaneously, the third gear on the third rotating shaft also rotates. Since the two third gears mesh with each other, the rotation of one third gear drives the other to rotate in the opposite direction. The two third gears can rotate in opposite directions, which in turn drives the two third rotating shafts to rotate in opposite directions, thereby driving the two third crushing rollers to rotate in opposite directions, thus achieving the crushing of sand and gravel.

[0039] By activating the fourth servo motor, the fourth rotating shaft, coaxially connected to it, is driven to rotate. Simultaneously, the fourth gear on the fourth rotating shaft also rotates. Since the two fourth gears mesh with each other, the rotation of one fourth gear drives the other to rotate in the opposite direction. The two fourth gears can rotate in opposite directions, which in turn drives the two fourth rotating shafts to rotate in opposite directions, thereby driving the two fourth crushing rollers to rotate in opposite directions, thus achieving the crushing of sand and gravel.

[0040] 7) A green and environmentally friendly sand and gravel aggregate production line system is obtained according to 1), wherein:

[0041] The conveying mechanism also includes a support frame, on which a drive wheel and a driven wheel are mounted. The conveyor belt is wound between the drive wheel and the driven wheel. A fifth rotating shaft is coaxially mounted inside the drive wheel, and a fifth servo motor is connected to the end of the fifth rotating shaft.

[0042] In this invention, the fifth servo motor is activated, driving the fifth rotating shaft to rotate, which in turn drives the drive wheel to rotate. The conveyor belt is wound between the drive wheel and the driven wheel. Friction exists between the surfaces of the conveyor belt and the drive wheel; therefore, the rotation of the drive wheel starts the conveyor belt. Similarly, friction exists between the surfaces of the conveyor belt and the driven wheel; therefore, the driven wheel rotates simultaneously with the conveyor belt. This ensures the continuity and stability of the entire conveying process.

[0043] 8) A green and environmentally friendly sand and gravel aggregate production line system is obtained according to 1), wherein:

[0044] The humidification and dust suppression mechanism includes several first spraying mechanisms, which are evenly distributed on both sides of the conveyor belt along the conveying direction. Each first spraying mechanism includes a first through pipe disposed above the upper surface of the conveyor belt, and several first nozzles that spray water toward the upper surface of the conveyor belt are evenly distributed along its axial direction. Several second spraying mechanisms are evenly distributed on both sides of the conveyor belt along its conveying direction. Each second spraying mechanism includes a second through pipe disposed below the lower surface of the conveyor belt, and several second nozzles that spray water toward the lower surface of the conveyor belt are evenly distributed along its axial direction.

[0045] In this invention, a first spraying mechanism is evenly distributed on both sides of the conveyor belt. The first spraying mechanism includes a first through-pipe positioned above the upper surface of the conveyor belt. When the conveyor belt reaches the upper side, the sand and gravel aggregate is located on the upper surface of the conveyor belt. The water sprayed from the first through-pipe can completely cover the upper surface of the conveyor belt, thus fully covering the sand and gravel aggregate. This arrangement ensures the uniformity of water spraying, thereby improving the dust suppression effect. Several first nozzles are evenly distributed along the axial direction of the first through-pipe, spraying water towards the upper surface of the conveyor belt. The even distribution of the first nozzles on the first through-pipe allows for a wide and uniform water spray range, effectively wetting the surface of the sand and gravel aggregate. When water is sprayed onto the sand and gravel aggregate through the first nozzles, the water droplets come into contact with the stone powder on the surface of the sand and gravel aggregate, wetting it. The wetted stone powder is no longer easily blown away by the wind, thus effectively reducing dust generation.

[0046] The second spraying mechanism is evenly distributed on both sides of the conveyor belt. It includes a second pipe positioned below the lower side of the conveyor belt. When the conveyor belt reaches the lower side, the water sprayed from the second pipe completely covers the lower side of the belt. Several second nozzles are evenly arranged along the axial direction of the second pipe, spraying water towards the lower side of the conveyor belt. The even distribution of the second nozzles on the second pipe ensures a wide and uniform water spray range, effectively wetting the lower side of the conveyor belt. When the wetted belt reaches the upper side, the sand and gravel aggregate is placed on the wetted surface. Because the belt surface is already moist, the stone powder at the bottom of the sand and gravel aggregate combines with the water, becoming wet as well. When the sand and gravel aggregate enters subsequent processing steps, during its descent, the stone powder at the bottom, already wetted, will not be stirred up, effectively suppressing dust.

[0047] In addition, when stone powder combines with water, it becomes viscous and easily adheres to the surface of the conveyor belt. When the conveyor belt runs to the lower side, the second nozzle can spray water onto the belt surface that is running to the lower side. The sprayed water will directly wash away the stone powder adhering to the belt surface, thereby keeping the conveyor belt clean.

[0048] 9) A green and environmentally friendly sand and gravel aggregate production line system is obtained according to 8), wherein:

[0049] Each of the first pipes is connected to a first vertical rod at both ends. The first vertical rod is fixedly connected to the bracket. One end of the first pipe is connected to a first water pipe, and the other end of the first pipe is closed.

[0050] Each of the second pipes has a second vertical rod connected to both ends. The second vertical rod is fixedly connected to the bracket. One end of the second pipe is connected to a second water pipe, and the other end of the second pipe is closed.

[0051] In this invention, each first pipe has a first vertical rod connected to both ends. The first vertical rod is fixedly connected to a bracket, providing stable support for the first pipe and ensuring it remains in a fixed position above the conveyor belt during water spraying. This allows the first nozzle to accurately aim at the sand and gravel aggregate on the conveyor belt. One end of the first pipe is connected to a first water pipe, facilitating water injection into the first pipe and ensuring a continuous water supply to the first nozzle. The other end is closed to prevent water loss from the end of the first pipe, ensuring all water is sprayed out through the first nozzle, improving water utilization and reducing waste. Simultaneously, the closed end maintains water pressure within the first pipe, allowing water to flow smoothly to each first nozzle, thus ensuring uniform water spraying from the nozzle.

[0052] Each second conduit is connected to two second vertical rods at both ends, which are fixedly connected to a bracket, providing stable support for the conduit. This ensures that the conduit remains in a fixed position below the lower surface of the conveyor belt during water spraying, allowing the second nozzles to accurately target and spray water onto the lower surface of the conveyor belt. One end of the second conduit is connected to a second water pipe, facilitating water injection into the conduit and ensuring a continuous water supply to the second nozzles. The other end is sealed to prevent water loss, ensuring that all water is sprayed through the second nozzles, improving water utilization and reducing waste. Simultaneously, the sealed end maintains water pressure within the conduit, allowing water to flow smoothly to each second nozzle, ensuring even water distribution.

[0053] 10) A green and environmentally friendly sand and gravel aggregate production line system is obtained according to 7), wherein:

[0054] The support is equipped with a main water pipe at its bottom. The main water pipe has several first water outlets and several second water outlets evenly distributed along its axis. Each first water outlet is connected to a first water pipe and each second water outlet is connected to a second water pipe. One end of the main water pipe is closed, and the other end of the main water pipe is connected to a water tank through a flexible hose. A suction pump is connected to the flexible hose.

[0055] In this invention, a main water pipe is located at the bottom of the support frame. One end of the main water pipe is connected to a water tank via a flexible hose, which is equipped with a suction pump. The suction pump draws water from the water tank and delivers it into the main water pipe. The other end of the main water pipe is closed to prevent water loss and avoid water waste. Several first water outlets and several second water outlets are evenly distributed along the axial direction of the main water pipe. Water flowing out of the main water pipe through the first water outlets enters its corresponding and connected first water pipe; water flowing out of the main water pipe through the second water outlets enters its corresponding and connected second water pipe, ensuring that the water in the main water pipe is evenly distributed to each first and second water pipe, guaranteeing a continuous water supply to each pipe.

[0056] Compared with the prior art, the present invention also has the following technical effects:

[0057] In this invention, the crushing device includes a first crushing mechanism disposed within the feed inlet for preliminary crushing of sand and gravel particles. An inclined screen plate is positioned below the first crushing mechanism to screen the pre-crushed sand and gravel particles. The screen plate faces the top of the second chamber, allowing smaller sand and gravel particles to pass through directly into the second chamber. These smaller particles are then crushed to the desired size by a fourth crushing mechanism. Simultaneously, the screen plate is inclined towards the top of the first chamber, preventing larger sand and gravel particles from passing through the screen holes. These larger particles slide along the inclined screen plate and eventually fall into the first chamber. These larger particles are then crushed into smaller particles by a second crushing mechanism. These smaller particles are then crushed to the desired size by a third crushing mechanism. By screening the sand and gravel after preliminary crushing, the screened particles automatically enter a targeted continuous crushing step. This method ensures that the sand and gravel particles meet consistent size and quality standards, while improving crushing efficiency and cost-effectiveness.

[0058] The humidification and dust suppression device includes a first pipe and a second pipe evenly distributed on both sides of the conveyor belt. Several first nozzles are evenly distributed along the axis of the first pipe, spraying water towards the upper side of the conveyor belt. The even distribution of the first nozzles on the first pipe ensures a wide and uniform water spray range, effectively wetting the surface of the sand and gravel aggregate. When water is sprayed onto the sand and gravel aggregate through the first nozzles, the water droplets contact the stone powder on the surface of the aggregate, wetting it. The wetted stone powder is less easily blown away by the wind, effectively reducing dust generation. Several second nozzles are evenly arranged along the axis of the second pipe, spraying water towards the lower side of the conveyor belt. The even distribution of the second nozzles on the second pipe ensures a wide and uniform water spray range, effectively wetting the lower side of the conveyor belt. When the wetted belt surface moves to the upper side, the sand and gravel aggregate is placed on the wetted belt surface. Because the surface of the aggregate already contains moisture, the stone powder at the bottom of the aggregate will combine with the water and become moist. When the aggregate enters subsequent processing steps, it will not be stirred up during its descent because the stone powder at the bottom has already absorbed the water, thus effectively suppressing dust. Attached Figure Description

[0059] Figure 1 This is a schematic diagram of a green and environmentally friendly sand and gravel aggregate production line system according to this utility model.

[0060] Figure 2 This is a cross-sectional view of the crushing device in a green and environmentally friendly sand and gravel aggregate production line system according to this utility model.

[0061] Figure 3This is a top view of the first crushing roller in a green and environmentally friendly sand and gravel aggregate production line system of this utility model.

[0062] Figure 4 This is a side view of a humidification and dust suppression device in a green and environmentally friendly sand and gravel aggregate production line system according to this utility model.

[0063] Figure 5 This is a front view of the conveyor belt in a green and environmentally friendly sand and gravel aggregate production line system according to this utility model.

[0064] Figure 6 This is a top view of the main water pipe in a green and environmentally friendly sand and gravel aggregate production line system according to this utility model. Detailed Implementation

[0065] The following detailed description illustrates the specific implementation method:

[0066] The reference numerals in the accompanying drawings of the instruction manual include: housing 1, first chamber 2, second chamber 3, feed inlet 4, first discharge outlet 5, screen plate 6, second discharge outlet 7, third discharge outlet 8, vibrator 9, shock absorber spring 10, partition plate 11, first hopper 12, second hopper 13, first crushing roller 14, second crushing roller 15, first crushing tooth 16, third crushing roller 17, fourth crushing roller 18, second crushing tooth 19, first rotating shaft 20, first gear 21, first servo motor 22, driving wheel 23, driven wheel 24, fifth rotating shaft 25, fifth servo motor 26, first through pipe 27, first nozzle 28, second through pipe 29, second nozzle 30, first vertical rod 31, first water pipe 32, second vertical rod 33, second water pipe 34, main water pipe 35, first outlet 36, second outlet 37, water tank 38, and suction pump 39.

[0067] See the example. Figure 1 As shown in this embodiment, a green and environmentally friendly sand and gravel aggregate production line system includes a crushing device, a washing device, and a drying device. The crushing device is configured to crush sand and gravel aggregate into standard-compliant aggregate particles. The washing device, using a wheel-type sand washer (model XSD3622), is configured to remove impurities and mud from the surface of the crushed aggregate particles. The drying device, using a drum-type sand and gravel dryer (model LJSH), is configured to dry the surface moisture of the washed aggregate particles. A conveying mechanism is provided between the crushing device and the washing device. The conveying mechanism includes a conveyor belt, and humidification and dust suppression mechanisms are provided on both sides of the conveyor belt for spraying water onto the belt surface.

[0068] In this embodiment, the crushing device is used to crush sand and gravel aggregates into standard-compliant aggregate particles. By precisely controlling the crushing process, it ensures that the raw materials are crushed to the required particle size. This avoids the production of substandard aggregate particles, thus eliminating the need for secondary crushing steps, simplifying the production process, and reducing energy consumption, thereby improving crushing efficiency and cost-effectiveness. The crushed aggregate particles are then conveyed to a washing device to remove impurities and dirt from their surface. The washing device effectively removes dirt, dust, and other impurities from the surface of the aggregate particles through the impact of water flow, ensuring cleanliness and improving the quality of the aggregate particles to better meet the requirements of construction, road, and other engineering projects. Furthermore, it prevents secondary pollution from dirt, dust, and other impurities on the surface of the aggregate particles during subsequent processing or use. The washed aggregate particles are then conveyed to a drying device to dry the surface moisture. The dried surface of the sand and gravel aggregate particles reduces the impact of moisture on their properties, thereby improving their quality. Secondly, it extends the storage time of the sand and gravel aggregate particles and prevents problems such as clumping and mold growth caused by moisture.

[0069] The conveying mechanism transports crushed sand and gravel aggregate particles to a washing unit for cleaning. Humidifying dust suppression devices are installed on both sides of the conveyor belt. These devices spray water onto the conveyor belt surface, thus wetting the sand and gravel aggregate particles transported on it. The water droplets come into contact with the stone powder within the particles, making them less susceptible to being blown away, effectively reducing dust generation.

[0070] See Figure 2 As shown, the crushing device includes a housing 1, which contains a first chamber 2 for crushing larger sand and gravel particles and a second chamber 3 for crushing smaller sand and gravel particles. The top of the housing 1 has a feed inlet 4, and the bottom of the housing 1 has a first discharge outlet 5. The feed inlet 4 contains a first crushing mechanism, and below the first crushing mechanism is a screen plate 6. The screen plate 6 is inclined, with the inclined direction of the screen plate 6 facing the top of the first chamber 2. The first chamber 2 contains a second crushing mechanism, and the bottom of the first chamber 2 has a second discharge outlet 7. The second discharge outlet 7 contains a third crushing mechanism, and the surface of the screen plate 6 faces the top of the second chamber 2. The bottom of the second chamber 2 has a third discharge outlet 8, and the third discharge outlet 8 contains a fourth crushing mechanism.

[0071] In this embodiment, a first crushing mechanism is provided inside the feed inlet 4 for preliminary crushing of the sand and gravel particles. An inclined screen plate 6 is located below the first crushing mechanism to screen the pre-crushed sand and gravel particles. The surface of the screen plate 6 faces the top of the second chamber 3, allowing smaller sand and gravel particles to pass through the screen plate 6 and directly enter the second chamber 3. These smaller sand and gravel particles then fall naturally to the bottom of the second chamber 3 and are discharged through the third discharge port 8 at the bottom of the second chamber. A fourth crushing mechanism is provided inside the third discharge port 8 to further crush these smaller sand and gravel particles to the required size. After being crushed by the fourth crushing mechanism, the sand and gravel particles reach the required size standard. These size-compliant sand and gravel particles then naturally slide to the bottom of the housing 1 and are finally discharged from the housing through the first discharge port 5 at the bottom of the housing 1.

[0072] Meanwhile, the screen plate 6 is inclined towards the top of the first chamber 2. Larger sand and gravel particles cannot pass through the screen holes on the screen plate 6. These larger sand and gravel particles slide along the inclined screen plate 6 and eventually fall into the first chamber 2. Next, these larger sand and gravel particles will be crushed by the second crushing mechanism in the first chamber 2 into smaller sand and gravel particles. Subsequently, these smaller sand and gravel particles will naturally fall to the bottom of the first chamber 2 and be discharged through the second discharge port 7 at the bottom of the first chamber. The second discharge port 7 is equipped with a third crushing mechanism to further crush these smaller sand and gravel particles to the required size. After being crushed by the third crushing mechanism, the sand and gravel particles reach the required size standard. These sand and gravel particles that meet the size requirements will then naturally slide to the bottom of the box 1 and finally be discharged from the box 1 through the first discharge port 5 at the bottom of the box 1. By screening the sand and gravel particles after the initial crushing, the screened sand and gravel particles automatically enter the targeted continuous crushing step. This method can ensure that the sand and gravel particles reach a consistent size and quality standard, while improving crushing efficiency and cost-effectiveness.

[0073] A vibrator 9 is provided at the bottom of the screen plate 6, and a shock-absorbing spring 10 is embedded at the connection between the inner wall of the housing 1 and the screen plate 6. The screen plate 6 and the shock-absorbing spring 10 are fixedly connected. In this embodiment, the vibrator 9 at the bottom of the screen plate 6 can cause the screen plate 6 to vibrate, and the sand and gravel particles on the screen plate 6 will be subjected to vibration. This vibration can cause the sand and gravel particles to bounce and fall repeatedly on the screen plate 6, thereby allowing smaller sand and gravel particles to pass through the screen holes quickly. At the same time, it causes larger sand and gravel particles to move quickly towards the inclined end of the screen plate 6, thereby improving the screening efficiency. Secondly, this vibration can prevent the sand and gravel particles from clogging in the screen holes and accumulating on the screen plate 6. In addition, a shock-absorbing spring 10 is embedded at the connection between the inner wall of the housing 1 and the screen plate 6, and the screen plate 6 is fixedly connected to the shock-absorbing spring 10. When the screen plate 6 vibrates, the damping spring 10 can absorb the vibration and the impact force generated when sand and gravel particles hit the screen plate 6, ensuring that the vibration and impact force are not directly transmitted to the structure of the box 1, thereby avoiding damage to the structure of the box 1.

[0074] Secondly, a partition plate 11 is provided between the first chamber 2 and the second chamber 3. The first chamber 2 is provided with a first hopper 12 at the bottom, and the cross-section of the first hopper 12 is an inverted trapezoid. The second chamber 3 is provided with a second hopper 13 at the bottom, and the cross-section of the second hopper 13 is an inverted trapezoid. The bottom of the partition plate 11 is connected to the top edge of the first hopper 12 and the second hopper 13 respectively.

[0075] In this embodiment, a partition plate 11 is provided between the first chamber 2 and the second chamber 3 to separate them. This ensures that smaller sand and gravel particles after screening fall accurately into the second chamber 3, while larger particles fall accurately into the first chamber 2, preventing mixing of the particles upon entering the chambers and thus affecting the subsequent crushing effect. Secondly, a first hopper 12 is provided at the bottom of the first chamber 2 to collect the sand and gravel particles after crushing by the second crushing mechanism. The cross-section of the first hopper 12 is an inverted trapezoid, allowing the sand and gravel particles to move quickly towards the bottom of the hopper 12, preventing them from adhering to the side walls. A second hopper 13 is provided at the bottom of the second chamber 3 to collect the sand and gravel particles that have passed through the screen plate 6. The cross-section of the second hopper 13 is also an inverted trapezoid, allowing the sand and gravel particles to move quickly towards the bottom of the hopper 13, preventing them from adhering to the side walls.

[0076] See Figure 2As shown, the first crushing mechanism includes two first crushing rollers 14 rotating in opposite directions, the second crushing mechanism includes two second crushing rollers 15 rotating in opposite directions, and the surfaces of the first crushing rollers 14 and the second crushing rollers 15 are evenly distributed with several first crushing teeth 16. The first crushing rollers 14 and the second crushing rollers 15 are the same size. The third crushing mechanism includes two third crushing rollers 17 rotating in opposite directions, and the fourth crushing mechanism includes two fourth crushing rollers 18 rotating in opposite directions. The surfaces of the third crushing rollers 17 and the fourth crushing rollers 18 are evenly distributed with several second crushing teeth 20. The third crushing rollers 17 and the fourth crushing rollers 18 are the same size.

[0077] In this embodiment, the first crushing mechanism includes two opposing crushing rollers 14. When sand and gravel particles pass between the two first crushing rollers 14, the opposing crushing rollers 14 can compress the sand and gravel particles, causing them to break under the pressure. The two first crushing rollers 14 are of the same size and rotate in opposite directions, ensuring that the sand and gravel particles are subjected to uniform pressure, resulting in more uniform crushing. Similarly, the second crushing mechanism includes two opposing crushing rollers 15. When sand and gravel particles pass between the two second crushing rollers 15, the opposing crushing rollers 15 can compress the sand and gravel particles, causing them to break under the pressure. The two second crushing rollers 15 are of the same size and rotate in opposite directions, ensuring that the sand and gravel particles are subjected to uniform pressure during the crushing process, resulting in more uniform crushing. Furthermore, the first crushing rollers 14 and the second crushing rollers 15 are of the same size, ensuring that the smaller sand and gravel particles produced by the first crushing rollers 14 and the sand and gravel particles produced by the second crushing rollers 15 have the same particle size. These sand and gravel particles then enter the next crushing stage, thereby ensuring the uniformity of the final crushed sand and gravel particles.

[0078] Furthermore, several first crushing teeth 16 are evenly distributed on the surfaces of the first crushing roller 14 and the second crushing roller 15. When sand and gravel particles enter the first crushing roller 14 and the second crushing roller 15, they first come into contact with the first crushing teeth 16. When the sand and gravel particles contact the first crushing teeth 16, their sharp teeth can effectively perform preliminary crushing treatment on the sand and gravel particles. Secondly, the first crushing teeth 16 can penetrate deep into the interior of the sand and gravel particles, firmly clamping the sand and gravel particles between the first crushing teeth 16. This can prevent the sand and gravel particles from sliding or falling off during the crushing process. Under the clamping of the first crushing teeth 16, the sand and gravel particles will move between the two crushing rollers for crushing treatment. The first crushing teeth 16 can maintain the stability of the crushing process, thereby improving the crushing efficiency.

[0079] The third crushing mechanism includes two opposing crushing rollers 17. When sand and gravel particles pass between the two rollers 17, the opposing rollers compress the sand and gravel, causing the particles to break. The two rollers 17 are of the same size and rotate in opposite directions, ensuring that the sand and gravel particles experience uniform pressure during crushing, resulting in more uniform particle breakage. Similarly, the fourth crushing mechanism includes two opposing crushing rollers 18. When sand and gravel particles passing through the screen plate pass between the two rollers 18, the opposing rollers compress the particles, causing them to break. The two rollers 18 are of the same size and rotate in opposite directions, ensuring that the sand and gravel particles experience uniform pressure during crushing, resulting in more uniform particle breakage.

[0080] Secondly, the third crushing roller 17 and the fourth crushing roller 18 are of the same size, ensuring that the particle size of the sand and gravel produced after crushing by the third crushing roller 17 and the fourth crushing roller 18 is consistent, thus ensuring the uniformity of the final crushed sand and gravel particles. Furthermore, several second crushing teeth 20 are evenly distributed on the surface of the third crushing roller 17 and the fourth crushing roller 18. When sand and gravel particles enter the third crushing roller 17 and the fourth crushing roller 18, they first come into contact with the second crushing teeth 20. When the sand and gravel particles contact the second crushing teeth 20, their sharp teeth can effectively perform preliminary crushing treatment on the sand and gravel particles. Secondly, the second crushing teeth 20 can penetrate deep into the interior of the sand and gravel particles, firmly clamping the sand and gravel particles between the teeth 20. This prevents the sand and gravel particles from sliding or falling off during the crushing process. Under the clamping of the second crushing teeth 20, the sand and gravel particles will move between the two crushing rollers for further crushing. The second crushing teeth 20 can maintain the stability of the crushing process, thereby improving crushing efficiency.

[0081] See Figure 3As shown, in the first crushing mechanism, a first rotating shaft 20 is coaxially inserted into each of the two first crushing rollers 14. One end of each first rotating shaft 20 passes through the housing 1 and is fitted with a first gear 21. The two first gears 21 mesh, and one of the first rotating shafts 20 is coaxially connected to a first servo motor 22. In the second crushing mechanism, a second rotating shaft is coaxially inserted into each of the two second crushing rollers. One end of each second rotating shaft passes through the housing and is fitted with a second gear. The two second gears mesh, and one of the second rotating shafts is coaxially connected to a second servo motor. In the third crushing mechanism, a third rotating shaft is coaxially inserted into each of the two third crushing rollers. One end of each third rotating shaft passes through the housing and is fitted with a third gear. The two third gears mesh, and one of the third rotating shafts is coaxially connected to a third servo motor. In the fourth crushing mechanism, a fourth rotating shaft is coaxially inserted into each of the two fourth crushing rollers. One end of each fourth rotating shaft passes through the housing and is fitted with a fourth gear. The two fourth gears mesh, and one of the fourth rotating shafts is coaxially connected to a fourth servo motor.

[0082] In this embodiment, the first servo motor 22 is activated, thereby driving the first rotating shaft 20, which is coaxially connected to it, to rotate. Simultaneously, the first gear 21 on the first rotating shaft 20 also rotates. Since the two first gears 21 mesh with each other, the rotation of one first gear 21 will drive the other first gear 21 to rotate in the opposite direction. The two first gears 21 can rotate in opposite directions, thereby driving the two first rotating shafts 20 to rotate in opposite directions, which in turn drives the two first crushing rollers 14 to rotate in opposite directions, thus achieving the crushing process of sand and gravel.

[0083] By activating the second servo motor, the second rotating shaft coaxially connected to it is driven to rotate. Simultaneously, the second gear on the second rotating shaft also rotates. Since the two second gears mesh with each other, the rotation of one second gear drives the other to rotate in the opposite direction. The two second gears can rotate in opposite directions, which in turn drives the two second rotating shafts to rotate in opposite directions, thereby driving the two second crushing rollers to rotate in opposite directions, thus achieving the crushing of sand and gravel.

[0084] By activating the third servo motor, the third rotating shaft coaxially connected to it is driven to rotate. Simultaneously, the third gear on the third rotating shaft also rotates. Since the two third gears mesh with each other, the rotation of one third gear drives the other to rotate in the opposite direction. The two third gears can rotate in opposite directions, which in turn drives the two third rotating shafts to rotate in opposite directions, thereby driving the two third crushing rollers to rotate in opposite directions, thus achieving the crushing of sand and gravel.

[0085] By activating the fourth servo motor, the fourth rotating shaft, coaxially connected to it, is driven to rotate. Simultaneously, the fourth gear on the fourth rotating shaft also rotates. Since the two fourth gears mesh with each other, the rotation of one fourth gear drives the other to rotate in the opposite direction. The two fourth gears can rotate in opposite directions, which in turn drives the two fourth rotating shafts to rotate in opposite directions, thereby driving the two fourth crushing rollers to rotate in opposite directions, thus achieving the crushing of sand and gravel.

[0086] See Figure 3 As shown, the conveying mechanism also includes a support frame, on which a drive wheel 23 and a driven wheel 24 are provided. The conveyor belt is wound between the drive wheel 23 and the driven wheel 24. A fifth rotating shaft 25 is coaxially provided inside the drive wheel 23. A fifth servo motor 26 is connected to the end of the fifth rotating shaft 25.

[0087] In this embodiment, the fifth servo motor 26 is activated, driving the fifth rotating shaft 25 to rotate, which in turn drives the drive wheel 23 to rotate. The conveyor belt is wound between the drive wheel 23 and the driven wheel 24. Friction exists between the surfaces of the conveyor belt and the drive wheel 23; therefore, the rotation of the drive wheel 23 starts the conveyor belt. Similarly, friction exists between the surfaces of the conveyor belt and the driven wheel 24; therefore, as the conveyor belt runs, the driven wheel 24 also rotates. This ensures the continuity and stability of the entire conveying process.

[0088] See Figure 3 and Figure 4 As shown, the humidification and dust suppression mechanism includes several first spraying mechanisms, which are evenly distributed on both sides of the conveyor belt along the conveying direction. Each first spraying mechanism includes a first through pipe 27 disposed above the upper surface of the conveyor belt, and several first nozzles 28 evenly distributed along its axial direction to spray water towards the upper surface of the conveyor belt. Several second spraying mechanisms are evenly distributed on both sides of the conveyor belt along its conveying direction. Each second spraying mechanism includes a second through pipe 29 disposed below the lower surface of the conveyor belt, and several second nozzles 30 evenly distributed along its axial direction to spray water towards the lower surface of the conveyor belt.

[0089] In this embodiment, the first spraying mechanism is evenly distributed on both sides of the conveyor belt. The first spraying mechanism includes a first through pipe 27 disposed above the upper surface of the conveyor belt. When the conveyor belt runs to the upper side, the sand and gravel aggregate is located on the upper surface of the conveyor belt. The water sprayed from the first through pipe 27 can fully cover the upper surface of the conveyor belt, thereby fully covering the sand and gravel aggregate on the upper surface of the conveyor belt. This arrangement can ensure the uniformity of water spraying, thereby improving the dust suppression effect. Several first nozzles 28 are evenly distributed along the axial direction of the first through pipe 27. These first nozzles 28 spray water towards the upper surface of the conveyor belt. The first nozzles 28 are evenly distributed on the first through pipe 27, which can make the water spraying range wide and uniform, thereby effectively wetting the surface of the sand and gravel aggregate. When water is sprayed onto the sand and gravel aggregate through the first nozzles 28, the water droplets will come into contact with the stone powder on the surface of the sand and gravel aggregate, wetting it. The wetted stone powder is no longer easily blown away by the wind, thereby effectively reducing the generation of dust.

[0090] The second spraying mechanism is evenly distributed on both sides of the conveyor belt. The second spraying mechanism includes a second pipe 29 located below the lower side of the conveyor belt. When the conveyor belt reaches the lower side, the water sprayed from the second pipe 29 can completely cover the lower side of the conveyor belt. Several second nozzles 30 are evenly arranged along the axis of the second pipe 29, spraying water towards the lower side of the conveyor belt. The even distribution of the second nozzles 30 on the second pipe 29 ensures a wide and uniform water spray range, effectively wetting the lower side of the conveyor belt. When the wetted belt surface reaches the upper side, the sand and gravel aggregate is placed on the wetted surface. Because the belt surface is already moist, the stone powder at the bottom of the sand and gravel aggregate combines with the water, becoming wet. When the sand and gravel aggregate enters subsequent processing steps, during its descent, the stone powder at the bottom, already wetted, will not be stirred up, effectively suppressing dust.

[0091] In addition, when stone powder combines with water, it becomes viscous and easily adheres to the surface of the conveyor belt. When the conveyor belt runs to the lower side, the second nozzle can spray water onto the belt surface that is running to the lower side. The sprayed water will directly wash away the stone powder adhering to the belt surface, thereby keeping the conveyor belt clean.

[0092] Secondly, each of the first pipes 27 has a first vertical rod 31 connected to both ends, the first vertical rod 31 is fixedly connected to the bracket, one end of the first pipe 27 is connected to the first water pipe 32, and the other end of the first pipe 27 is closed; each of the second pipes 29 has a second vertical rod 33 connected to both ends, the second vertical rod 33 is fixedly connected to the bracket, one end of the second pipe 29 is connected to the second water pipe 34, and the other end of the second pipe 29 is closed.

[0093] In this embodiment, each first pipe 27 is connected to a first vertical rod 31 at both ends. The first vertical rod 31 is fixedly connected to a bracket, providing stable support for the first pipe 27 and ensuring it remains in a fixed position above the conveyor belt during water spraying. This allows the first nozzle 28 to accurately spray water onto the sand and gravel aggregate on the conveyor belt. One end of the first pipe 27 is connected to a first water pipe 32, facilitating the injection of water into the first pipe 27 and ensuring a continuous water supply to the first nozzle 28. The other end is closed to prevent water from leaking out of the end of the first pipe 27, ensuring that all water is sprayed out through the first nozzle 28, improving water utilization and reducing waste. Simultaneously, the closed end maintains water pressure within the first pipe 27, allowing water to flow smoothly to each first nozzle 28, thus ensuring that water is sprayed evenly from the first nozzle 28.

[0094] Each second pipe 29 has a second vertical rod 33 connected to both ends. The second vertical rod 33 is fixedly connected to the bracket, providing stable support for the second pipe 29. This ensures that the pipe remains in a fixed position below the lower surface of the conveyor belt during water spraying, allowing the second nozzle 30 to accurately aim at the lower surface of the conveyor belt for water spraying. One end of the second pipe 29 is connected to a second water pipe 34, facilitating the injection of water into the pipe and ensuring a continuous water supply to the second nozzle 28. The other end is closed to prevent water loss from the end of the pipe 29, ensuring that all water is sprayed out through the second nozzle 30, improving water utilization and reducing waste. Simultaneously, the closed end maintains water pressure within the pipe 29, allowing water to flow smoothly to each second nozzle 30, thus ensuring that water is sprayed evenly from the nozzles.

[0095] In addition, a main water pipe 35 is provided at the bottom of the support. Several first water outlets 36 and several second water outlets 37 are evenly distributed along the axis of the main water pipe 35. Each first water outlet 36 corresponds to and is connected to a first water pipe 32, and each second water outlet 37 corresponds to and is connected to a second water pipe 34. One end of the main water pipe 35 is closed, and the other end of the main water pipe 35 is connected to a water tank 38 through a flexible hose. A suction pump 39 is connected to the flexible hose.

[0096] In this embodiment, a main water pipe 35 is provided at the bottom of the support. One end of the main water pipe 35 is connected to the water tank 38 via a flexible hose. A suction pump 39 is provided on the flexible hose, which can draw water from the water tank 38 and deliver it into the main water pipe 35. The other end of the main water pipe 35 is closed to prevent water from flowing out and to avoid water waste. Several first water outlets 36 and several second water outlets 37 are evenly distributed along the axial direction of the main water pipe 35. Water flowing out of the main water pipe 35 through the several first water outlets 36 enters the corresponding and connected first water pipe 32; water flowing out of the main water pipe 35 through the several second water outlets 37 enters the corresponding and connected second water pipe 34, so that the water in the main water pipe 35 can be evenly distributed to each first water pipe 32 and second water pipe 34, ensuring a continuous water supply to each first connecting pipe 27 and second connecting pipe 29.

[0097] In this embodiment, the crushing device includes a first crushing mechanism disposed within the feed inlet 4 for preliminary crushing of sand and gravel particles. An inclined screen plate 6 is disposed below the first crushing mechanism to screen the pre-crushed sand and gravel particles. The surface of the screen plate 6 faces the top of the second chamber 3, allowing smaller sand and gravel particles to pass through the screen plate 6 and directly enter the second chamber 3. Subsequently, these smaller sand and gravel particles are crushed to the required size by a fourth crushing mechanism. Simultaneously, the screen plate 6 is inclined towards the top of the first chamber 2, preventing larger sand and gravel particles from passing through the screen holes. These larger particles slide along the inclined screen plate 6 and eventually fall into the first chamber 2. These larger sand and gravel particles are then crushed into smaller sand and gravel particles by a second crushing mechanism. Subsequently, these smaller sand and gravel particles are crushed to the required size by a third crushing mechanism. By screening the sand and gravel after initial crushing, the screened sand and gravel particles automatically enter a targeted continuous crushing step. This method can ensure that the sand and gravel particles reach consistent size and quality standards, while improving crushing efficiency and cost-effectiveness.

[0098] The humidification and dust suppression device includes a first pipe 27 and a second pipe 29 evenly distributed on both sides of the conveyor belt. Several first nozzles 28 are evenly distributed along the axial direction of the first pipe 27, spraying water towards the upper surface of the conveyor belt. The even distribution of the first nozzles 28 on the first pipe 27 ensures a wide and uniform water spray range, effectively wetting the surface of the sand and gravel aggregate. When water is sprayed onto the sand and gravel aggregate through the first nozzles 28, the water droplets contact the stone powder on the surface of the aggregate, wetting it. The wetted stone powder is less easily blown away by the wind, effectively reducing dust generation. Several second nozzles 30 are evenly arranged along the axial direction of the second pipe 29, spraying water towards the lower surface of the conveyor belt. The even distribution of the second nozzles 30 on the second pipe 29 ensures a wide and uniform water spray range, effectively wetting the lower surface of the conveyor belt. As the wet conveyor belt moves to the upper side, the sand and gravel aggregate is placed on the wet belt surface. Because the belt surface is already moist, the stone powder at the bottom of the sand and gravel aggregate combines with the water, thus becoming wet. When the sand and gravel aggregate enters the subsequent processing steps, during its descent, the stone powder at its bottom, already wetted, will not be stirred up, effectively suppressing dust.

[0099] The above are merely embodiments of this utility model. Commonly known technical solutions and / or characteristics are not described in detail here. It should be noted that those skilled in the art can make various modifications and improvements without departing from the technical solution of this utility model. These modifications and improvements should also be considered within the scope of protection of this utility model, and will not affect the effectiveness of the implementation of this utility model or the practicality of the patent. The scope of protection claimed in this application shall be determined by the content of its claims, and the specific embodiments described in the specification can be used to interpret the content of the claims.

Claims

1. A green and environmentally friendly sand and gravel aggregate production line system, characterized in that, include: The crushing device is configured to crush sand and gravel aggregates into standard sand and gravel aggregate particles. The stone washing device is configured to remove impurities and soil from the surface of crushed sand and gravel aggregate particles. The drying device is configured to dry the surface moisture of sand and gravel aggregate particles after cleaning. A conveying mechanism is provided between the crushing device and the stone washing device. The conveying mechanism includes a conveyor belt, and humidification and dust suppression mechanisms for spraying water onto the surface of the conveyor belt are provided on both sides of the conveyor belt.

2. The green and environmentally friendly sand and gravel aggregate production line system according to claim 1, characterized in that: The crushing device includes a housing, which contains a first chamber for crushing larger sand and gravel aggregate particles and a second chamber for crushing smaller sand and gravel aggregate particles. The top of the housing has a feed inlet, and the bottom of the housing has a first discharge outlet. A first crushing mechanism is located inside the feed inlet. Below the first crushing mechanism is a screen plate, which is inclined towards the top of the first chamber. A second crushing mechanism is located inside the first chamber, and a second discharge outlet is located at the bottom of the first chamber. A third crushing mechanism is located inside the second discharge outlet. The surface of the screen plate faces the top of the second chamber, and a third discharge outlet is located at the bottom of the second chamber. A fourth crushing mechanism is located inside the third discharge outlet.

3. The green and environmentally friendly sand and gravel aggregate production line system according to claim 2, characterized in that: The bottom of the screen plate is equipped with a vibrator, and several shock-absorbing springs are embedded at the connection between the inner wall of the box and the screen plate. The screen plate is fixedly connected to each shock-absorbing spring.

4. The green and environmentally friendly sand and gravel aggregate production line system according to claim 2, characterized in that: A partition plate is provided between the first chamber and the second chamber. The first chamber contains a first hopper with an inverted trapezoidal cross-section. The second chamber contains a second hopper with an inverted trapezoidal cross-section. The bottom of the partition plate is connected to the top edge of the first and second hoppers, respectively.

5. The green and environmentally friendly sand and gravel aggregate production line system according to claim 2, characterized in that: The first crushing mechanism includes two first crushing rollers rotating in opposite directions, and the second crushing mechanism includes two second crushing rollers rotating in opposite directions. The surfaces of the first crushing rollers and the second crushing rollers are each provided with several first crushing teeth. The first crushing rollers and the second crushing rollers are the same size. The third crushing mechanism includes two third crushing rollers that rotate in opposite directions, and the fourth crushing mechanism includes two fourth crushing rollers that rotate in opposite directions. The surfaces of the third crushing rollers and the fourth crushing rollers are each provided with several second crushing teeth, and the third crushing rollers and the fourth crushing rollers are of the same size.

6. The green and environmentally friendly sand and gravel aggregate production line system according to claim 5, characterized in that: In the first crushing mechanism, a first rotating shaft is coaxially inserted into each of the two first crushing rollers. A first gear is sleeved on one end of each first rotating shaft that passes through the housing. The two first gears mesh together. One of the first rotating shafts is coaxially connected to a first servo motor. The second crushing mechanism has two second crushing rollers coaxially connected to a second rotating shaft. Each second rotating shaft has a second gear fitted at one end of its passage through the housing. The two second gears mesh, and one of the second rotating shafts is coaxially connected to a second servo motor. The third crushing mechanism has two third crushing rollers coaxially connected to a third rotating shaft. Each third rotating shaft has a third gear fitted at one end of the box, and the two third gears mesh. One of the third rotating shafts is coaxially connected to a third servo motor. The fourth crushing mechanism has a fourth rotating shaft coaxially inserted in each of the two fourth crushing rollers. Each fourth rotating shaft has a fourth gear fitted at one end of its passage through the housing. The two fourth gears mesh with each other. One of the fourth rotating shafts is coaxially connected to a fourth servo motor.

7. The green and environmentally friendly sand and gravel aggregate production line system according to claim 1, characterized in that: The conveying mechanism also includes a support frame, on which a drive wheel and a driven wheel are mounted. The conveyor belt is wound between the drive wheel and the driven wheel. A fifth rotating shaft is coaxially mounted inside the drive wheel, and a fifth servo motor is connected to the end of the fifth rotating shaft.

8. The green and environmentally friendly sand and gravel aggregate production line system according to claim 1, characterized in that: The humidification and dust suppression mechanism includes several first spraying mechanisms, which are evenly distributed on both sides of the conveyor belt along the conveying direction. Each first spraying mechanism includes a first through pipe disposed above the upper surface of the conveyor belt, and several first nozzles that spray water toward the upper surface of the conveyor belt are evenly distributed along its axial direction. Several second spraying mechanisms are evenly distributed on both sides of the conveyor belt along its conveying direction. Each second spraying mechanism includes a second through pipe disposed below the lower surface of the conveyor belt, and several second nozzles that spray water toward the lower surface of the conveyor belt are evenly distributed along its axial direction.

9. The green and environmentally friendly sand and gravel aggregate production line system according to claim 8, characterized in that: Each of the first pipes is connected to a first vertical rod at both ends. The first vertical rod is fixedly connected to the bracket. One end of the first pipe is connected to a first water pipe, and the other end of the first pipe is closed. Each of the second pipes has a second vertical rod connected to both ends. The second vertical rod is fixedly connected to the bracket. One end of the second pipe is connected to a second water pipe, and the other end of the second pipe is closed.

10. The green and environmentally friendly sand and gravel aggregate production line system according to claim 7, characterized in that: The support is equipped with a main water pipe at its bottom. The main water pipe has several first water outlets and several second water outlets evenly distributed along its axis. Each first water outlet is connected to a first water pipe and each second water outlet is connected to a second water pipe. One end of the main water pipe is closed, and the other end of the main water pipe is connected to a water tank through a flexible hose. A suction pump is connected to the flexible hose.

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