Device for producing recycled aggregate from construction waste sandstone

Abstract

The application relates to the technical field of aggregate regeneration, and discloses a device for producing regenerated aggregate by using construction waste sand and stone, which comprises a crushing mechanism for crushing the construction waste sand and stone, a mixing mechanism arranged beside the crushing mechanism and used for mixing the crushed sand and stone and a bonding agent, and a forming mechanism arranged in the mixing mechanism and used for forming the sand and stone mixed with the bonding agent; the device realizes accurate crushing by combining ball milling crushing with air selection, the grinding balls in the ball mill are rotated to grind the waste sand and stone, a blower downwardly blows air through a blowing pipe, an air pump upwardly draws air through a suction pipe, the air force of the blower is accurately adjusted, a critical lifting speed is set, only the qualified particles with the target particle size and smaller are allowed to be lifted and drawn away by the air pump, and the particles with a particle size larger than the target particle size continue to stay in the ball mill to be ground due to the gravity being greater than the air force, thereby providing high-quality raw materials with a high consistency in particle size for subsequent production of homogeneous standard units.

Description

Technical Field

[0001] This invention relates to the field of aggregate recycling technology, and in particular to an apparatus for producing recycled aggregates from construction waste sand and gravel. Background Technology

[0002] With the continuous advancement of urbanization and the vigorous development of the construction industry in my country, a large amount of construction waste sand and gravel is generated every year. If these waste sand and gravel are directly piled up or landfilled, they will not only occupy a large amount of land resources, but also cause environmental problems such as dust pollution and soil and groundwater pollution. Therefore, the resource utilization and recycling of construction waste sand and gravel has become an inevitable requirement for the construction industry to achieve sustainable development.

[0003] Processing construction waste sand and gravel into recycled aggregate is one of the most important resource utilization methods currently available. Recycled aggregate can replace some natural aggregate in the preparation of recycled concrete, road base materials, etc., and has good environmental and economic benefits. However, the mainstream recycled aggregate production processes and equipment still face some technical bottlenecks.

[0004] First, in the crushing stage, traditional jaw crushers or impact crushers, while highly efficient, consume a lot of energy and generate a lot of noise. Furthermore, they struggle to effectively control aggregate particle size during crushing, often producing large amounts of powdery material, leading to unsatisfactory gradation and uneven quality of recycled aggregates. Second, the mixing of crushed aggregates with binders is crucial to the performance of recycled products. Existing technologies often use independent mixing equipment, separate from the crushing process, resulting in discontinuous flow, increased material handling costs, and secondary dust risks. More importantly, it's difficult to achieve precise, dynamic proportions of binders and recycled aggregates. Fixed proportions or manual addition are typically used, failing to intelligently adjust the binder dosage based on real-time aggregate flow and particle size distribution entering the mixing equipment. This easily leads to uneven mixing, binder waste, or unstable product strength. Processing construction waste sand and gravel into recycled aggregates is currently the most important resource recovery method. Ideal recycled aggregates should have characteristics such as uniform particle size, reasonable gradation, and stable properties to serve as reliable building material raw materials. However, traditional recycled aggregate production and subsequent utilization processes make it difficult to obtain standard minimum units with uniform shape, size, and performance, which seriously restricts the quality and scope of their reuse.

[0005] Therefore, there is an urgent need to develop an automated device that can seamlessly integrate crushing, dynamic proportioning and mixing, in-situ homogenization and molding, and rapid solidification. Its core objective is to efficiently and controllably transform construction waste sand and gravel with complex composition and different properties into regenerated basic units with uniform performance and standard specifications. Summary of the Invention

[0006] To address the aforementioned technical problems, the present invention adopts the following technical solution: an apparatus for producing recycled aggregates from construction waste sand and gravel, comprising a crushing mechanism for crushing construction waste sand and gravel, the crushing mechanism including an air pump and a main drive shaft, a mixing mechanism for mixing the crushed sand and gravel with a binder located next to the crushing mechanism, and a forming mechanism for shaping the sand and gravel mixed with the binder located within the mixing mechanism. The mixing mechanism includes a mixing box, inside which a mesh impeller is rotatably mounted. The mesh impeller has multiple blades, each with multiple through holes.

[0007] Furthermore, the crushing mechanism includes a base plate, on which a fixed bracket is fixedly installed. A rotating ball mill is rotatably installed on the fixed bracket. The rotating ball mill is composed of two hemispheres. An air blowing pipe and an air extraction pipe are fixedly installed on the fixed bracket. The rotating ball mill is rotatably connected to the air extraction pipe and the air blowing pipe. One end of the air extraction pipe is connected to an air pump, and the other end of the air extraction pipe is located inside the rotating ball mill with its opening facing upward. The end of the air blowing pipe is located inside the rotating ball mill with its opening facing downward.

[0008] Furthermore, the rotating ball mill contains multiple grinding balls, and after the grinding balls are loaded into the rotating ball mill, the height of the grinding balls is below the end of the air blower inside the rotating ball mill.

[0009] Furthermore, the crushing mechanism also includes a blower connected to an air duct. A ball mill cover is provided on the rotating ball mill. The main drive shaft is rotatably mounted on a fixed bracket. A friction wheel is fixedly mounted on the main drive shaft. The friction wheel and the rotating ball mill form a friction transmission. A drive motor is provided next to the base plate. The drive motor drives the main drive shaft to rotate through gear transmission.

[0010] Furthermore, the mixing mechanism also includes an inlet pipe fixedly installed on the air pump, which is connected to the mixing chamber. The mixing chamber is provided with multiple air vents and an adhesive pipe, which is connected to an external adhesive pipeline.

[0011] Furthermore, the mixing mechanism also includes a dispensing shell fixedly installed on the adhesive tube, a dispensing impeller rotatably installed inside the dispensing shell, an outer drive wheel fixedly installed on the dispensing impeller, an inner drive wheel fixedly installed on the mesh impeller, and a drive belt wrapped around the inner drive wheel and the outer drive wheel.

[0012] Furthermore, the molding mechanism includes a lower crankshaft rotatably mounted below the mixing chamber, a crank gear fixedly mounted on the lower crankshaft, a movable connecting rod rotatably mounted on the lower crankshaft, a lower cooling seat fixedly mounted inside the mixing chamber, a cooling pipe provided inside the lower cooling seat, a sliding plate slidably mounted on the lower cooling seat, and multiple lower through holes provided on the sliding plate, with the sliding plate rotatably mounted to the movable connecting rod.

[0013] Furthermore, the molding mechanism also includes an upper gear rotatably mounted on the mixing box, an eccentric rotating column fixedly mounted on the upper gear, a lifting frame slidably mounted on the mixing box, a plurality of pressing columns fixedly mounted on the lifting frame, the pressing columns matching the lower through holes on the sliding plate, an upper guide plate fixedly mounted inside the mixing box, a plurality of upper through holes provided on the upper guide plate, the upper through holes matching the pressing columns, a rotating rod fixedly mounted on the lifting frame, a sliding groove provided on the rotating rod, and the eccentric rotating column sliding within the sliding groove.

[0014] Furthermore, the molding mechanism also includes an intermediate gear and an outer gear rotatably mounted on the mixing box. The intermediate gear meshes with the outer gear, an inner bevel gear is fixedly mounted on the outer gear, a spur bevel gear is fixedly mounted on the main drive shaft, and the spur bevel gear meshes with the inner bevel gear. A mating gear is rotatably mounted below the mixing box, and the mating gear meshes with the crank gear.

[0015] Furthermore, the mixing chamber is equipped with four kneading modules. Each kneading module includes two mixing rollers, one above the other. Roller gears are fixedly installed on the mixing rollers, and soft protrusions are provided on the mixing rollers. The roller gears on the upper mixing roller mesh with the roller gears on the adjacent lower mixing roller. The roller gears on the mixing roller closest to the middle gear mesh with the middle gear. The roller gears on the mixing roller closest to the upper gear mesh with the upper gear. The roller gears on the lower mixing roller mesh with the mating gear.

[0016] The advantages of this invention compared to the prior art are: (1) This invention achieves precise crushing by combining ball mill crushing with air separation. The grinding balls inside the ball mill grind the waste sand and gravel. At the same time, the blower blows air downward through the blow pipe and the air pump draws air upward through the exhaust pipe. By precisely adjusting the blower's air force, a critical lifting speed can be set, allowing only qualified particles that reach the target particle size and smaller to be lifted and drawn away by the air pump. Particles with excessively large particle sizes remain in the ball mill for grinding because their gravity is greater than the air force, thus providing high-quality raw materials with consistent particle size for the subsequent production of homogeneous standard units. (2) The present invention realizes the automatic matching of the amount of adhesive added and the amount of qualified aggregate entering. The air pump blows the sorted qualified aggregate into the mixing box and impacts the impeller. The impact force drives the impeller to rotate. This rotational motion drives the distribution impeller in the distribution shell to rotate synchronously through the transmission belt, thereby pumping the adhesive into the mixing box in a metered manner. The larger the amount of aggregate entering, the faster the speed of the impeller, and the faster the adhesive addition rate, ensuring the consistency of the proportion of the mixed materials. (3) The present invention integrates multiple processes such as mixing, conveying, pre-pressing, molding and cooling and curing into a continuous process. The kneading module, composed of multiple pairs of mixing rollers with soft protrusions, not only efficiently mixes aggregates and binders in the opposite rotation, but also plays the role of kneading, homogenizing and forward conveying. The mixture is continuously conveyed to the molding station. Through the cooperation of the pressing column and the sliding plate, the material is accurately pressed into the molding cavity. The cooling medium in the lower cooling seat below the molding cavity is used to cool and solidify the pressed unit in real time, so that it can quickly obtain initial strength and set shape. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 This is a schematic diagram of the crushing mechanism in the present invention. Figure 1 ; Figure 3 This is a schematic diagram of the crushing mechanism in the present invention. Figure 2 ; Figure 4 This is a schematic diagram of the mixing mechanism in the present invention. Figure 1 ; Figure 5 This is a schematic diagram of the mixing mechanism in the present invention. Figure 2 ; Figure 6 This is a schematic diagram of the molding mechanism in the present invention. Figure 1 ; Figure 7 This is a schematic diagram of the molding mechanism in the present invention. Figure 2 ; Figure 8 This is a schematic diagram of the molding mechanism in the present invention. Figure 3 ; Figure 9 This is a schematic diagram of the molding mechanism in the present invention. Figure 4 .

[0018] Reference numerals: 101. Base plate; 102. Drive motor; 103. Main drive shaft; 104. Fan; 105. Air duct; 106. Fixed bracket; 107. Rotating ball mill; 108. Ball mill cover; 109. Exhaust duct; 110. Air pump; 111. Friction wheel; 201. Mixing box; 202. Inlet pipe; 203. Distributor shell; 204. Adhesive pipe; 205. Ventilation groove; 206. Mesh impeller; 207. Inner drive wheel; 208. Drive belt; 209. Distributor impeller; 210. Outer drive wheel 301. Mixing roller; 302. Roller gear; 303. Intermediate gear; 304. Outer gear; 305. Inner bevel gear; 306. Positive bevel gear; 307. Lower crankshaft; 308. Movable connecting rod; 309. Sliding plate; 310. Lower cooling seat; 311. Upper gear; 312. Eccentric rotating column; 313. Rotating rod; 314. Slide groove; 315. Lifting frame; 316. Press-in column; 317. Crankshaft gear; 318. Upper guide plate; 319. Connecting gear; 320. Lower through hole; 321. Upper through hole. Detailed Implementation

[0019] The specific embodiments of the present invention will be further described below with reference to the accompanying drawings.

[0020] refer to Figures 1-9 An apparatus for producing recycled aggregates from construction waste sand and gravel includes a crushing mechanism for crushing construction waste sand and gravel, the crushing mechanism including an air pump 110 and a main drive shaft 103, a mixing mechanism for mixing the crushed sand and gravel with a binder is provided next to the crushing mechanism, and a forming mechanism for shaping the sand and gravel mixed with the binder is provided inside the mixing mechanism. The mixing mechanism includes a mixing box 201, in which a mesh impeller 206 is rotatably mounted. The mesh impeller 206 has multiple blades, and each blade has multiple through holes.

[0021] like Figure 2 , Figure 3 As shown, the crushing mechanism includes a base plate 101, a fixed bracket 106 is fixedly installed on the base plate 101, a rotating ball mill 107 is rotatably installed on the fixed bracket 106, the rotating ball mill 107 is composed of two hemispheres, a blower pipe 105 and an exhaust pipe 109 are fixedly installed on the fixed bracket 106, the rotating ball mill 107 is rotatably connected to the exhaust pipe 109, and the rotating ball mill 107 is rotatably connected to the blower pipe 105. One end of the exhaust pipe 109 is connected to the air pump 110, and the other end of the exhaust pipe 109 is located inside the rotating ball mill 107 with its opening facing upwards. The end of the blower pipe 105 is located inside the rotating ball mill 107 with its opening facing downwards.

[0022] like Figure 2 , Figure 3As shown, the rotating ball mill 107 contains multiple grinding balls. After the grinding balls are installed in the rotating ball mill 107, the height of the grinding balls is below the end of the air blower 105 inside the rotating ball mill 107.

[0023] like Figure 2 , Figure 3 As shown, the crushing mechanism also includes a blower 104, which is connected to a blower pipe 105. A ball mill cover 108 is provided on the rotating ball mill 107. The main drive shaft 103 is rotatably mounted on a fixed bracket 106. A friction wheel 111 is fixedly mounted on the main drive shaft 103. The friction wheel 111 and the rotating ball mill 107 form a friction transmission. A drive motor 102 is provided next to the base plate 101. The drive motor 102 drives the main drive shaft 103 to rotate through gear transmission.

[0024] In use, open the ball mill cover 108 and put the construction waste sand and gravel into the rotating ball mill 107. The construction waste sand and gravel fall into the grinding balls inside the rotating ball mill 107. Then close the ball mill cover 108. The drive motor 102 drives the main drive shaft 103 to rotate through gear transmission. The main drive shaft 103 drives the rotating ball mill 107 to rotate through the friction wheel 111. The rotating ball mill 107 drives the construction waste sand and gravel and the grinding balls inside to rotate together. The sand and gravel are ground by the grinding balls. At the same time, the blower 104 blows air downward through the air pipe 105 to lift the sand and gravel crushed by the grinding balls. At the same time, the air pump 110 draws air to draw the lifted sand and gravel into the exhaust pipe 109.

[0025] Adjust the airflow of the blower 104 according to the size of the sand and gravel to prevent excessively large sand and gravel from being blown up.

[0026] like Figure 4 , Figure 5 As shown, the mixing mechanism also includes an inlet pipe 202 fixedly installed on the air pump 110. The inlet pipe 202 is connected to the mixing box 201. The mixing box 201 is provided with a plurality of air vents 205. The mixing box 201 is provided with an adhesive pipe 204, which is connected to an external adhesive pipe.

[0027] like Figure 4 , Figure 5 As shown, the mixing mechanism also includes a dispensing shell 203 fixedly installed on the adhesive tube 204. A dispensing impeller 209 is rotatably installed inside the dispensing shell 203. An outer drive wheel 210 is fixedly installed on the dispensing impeller 209. An inner drive wheel 207 is fixedly installed on the mesh impeller 206. A drive belt 208 is wound around the inner drive wheel 207 and the outer drive wheel 210.

[0028] Air pump 110 draws the polished sand and gravel into mixing box 201 through inlet pipe 202. The sand and gravel are blown onto impeller 206. Small dust particles leave through ventilation groove 205. The through holes on impeller 206 allow airflow to pass directly through. Only when the sand and gravel are blown onto the blades of impeller 206 will impeller 206 rotate. The rotation of impeller 206 drives inner drive wheel 207 to rotate, which in turn drives outer drive wheel 210 and distribution impeller 209 to rotate counterclockwise through drive belt 208. This causes the adhesive fluid in distribution impeller 209 to flow into mixing box 201 in a metered manner along adhesive pipe 204, thus matching the amount of adhesive according to the amount of sand and gravel entering.

[0029] like Figures 6-9 As shown, the molding mechanism includes a lower crankshaft 307 rotatably mounted below the mixing chamber 201, a crank gear 317 fixedly mounted on the lower crankshaft 307, a movable connecting rod 308 rotatably mounted on the lower crankshaft 307, a lower cooling seat 310 fixedly mounted inside the mixing chamber 201, a cooling pipe provided inside the lower cooling seat 310, a sliding plate 309 slidably mounted on the lower cooling seat 310, and multiple lower through holes 320 opened on the sliding plate 309. The sliding plate 309 and the movable connecting rod 308 are rotatably mounted together.

[0030] like Figures 6-9 As shown, the molding mechanism also includes an upper gear 311 rotatably mounted on the mixing box 201, an eccentric rotating column 312 fixedly mounted on the upper gear 311, a lifting frame 315 slidably mounted on the mixing box 201, a plurality of pressing columns 316 fixedly mounted on the lifting frame 315, the pressing columns 316 matching the lower through holes 320 on the sliding plate 309, an upper guide plate 318 fixedly mounted inside the mixing box 201, a plurality of upper through holes 321 provided on the upper guide plate 318, the upper through holes 321 matching the pressing columns 316, a rotating rod 313 fixedly mounted on the lifting frame 315, a sliding groove 314 provided on the rotating rod 313, the eccentric rotating column 312 sliding in the sliding groove 314.

[0031] like Figures 6-9 As shown, the molding mechanism also includes an intermediate gear 303 and an outer gear 304 rotatably mounted on the mixing box 201. The intermediate gear 303 meshes with the outer gear 304. An inner bevel gear 305 is fixedly mounted on the outer gear 304. A spur bevel gear 306 is fixedly mounted on the main drive shaft 103. The spur bevel gear 306 meshes with the inner bevel gear 305. A mating gear 319 is rotatably mounted below the mixing box 201. The mating gear 319 meshes with the crank gear 317.

[0032] like Figures 6-9As shown, the mixing box 201 is equipped with four sets of kneading modules. Each kneading module includes two mixing rollers 301, one above the other. Roller gears 302 are fixedly installed on the mixing rollers 301. Soft protrusions are provided on the mixing rollers 301. The roller gears 302 on the upper mixing roller 301 mesh with the roller gears 302 on the adjacent lower mixing roller 301. The roller gear (302) on the mixing roller 301 closest to the middle gear 303 meshes with the middle gear 303. The roller gear (302) on the mixing roller (301) closest to the upper gear 311 meshes with the upper gear 311. The roller gear (302) on the lower mixing roller 301 meshes with the docking gear 319.

[0033] The main drive shaft 103 drives the inner bevel gear 305 and the outer bevel gear 304 to rotate via the bevel gear 306. The outer bevel gear 304 drives the middle gear 303 to rotate, and the middle gear 303 drives the roller gear 302 and the mixing roller 301 below the rightmost kneading module to rotate. Subsequently, it drives the roller gear 302 and the mixing roller 301 above the rightmost kneading module to rotate. Each adjacent kneading module drives each other, ultimately causing all the mixing rollers 301 to rotate together, with the upper and lower mixing rollers 301 rotating in opposite directions. The leftmost kneading module... The roller gear 302 on the upper mixing roller 301 drives the upper gear 311 and the eccentric rotating column 312 to rotate. The roller gear 302 drives the rotating rod 313, the lifting frame 315 and the pressing column 316 to rise and fall through the slide groove 314. The roller gear 302 on the mixing roller 301 below the leftmost kneading module drives the docking gear 319 to rotate. The docking gear 319 drives the crank gear 317 and the lower crankshaft 307 to rotate. The rotation of the lower crankshaft 307 drives the sliding plate 309 to slide back and forth in the horizontal direction along the lower cooling seat 310 through the movable connecting rod 308.

[0034] The adhesive and sand / gravel fall together into the mixing roller 301, where they are mixed and conveyed. The mixed sand / gravel is then transported to the upper through-hole 321 of the upper guide plate 318. When the pressing column 316 descends, the lower through-hole 320 on the sliding plate 309 aligns with the upper through-hole 321 on the upper guide plate 318. The diameter of the lower through-hole 320 is larger than the diameter of the upper through-hole 321. The pressing column 316 then forces the material above the upper through-hole 321 of the upper guide plate 318 downwards. The raw material is pressed into the lower through hole 320 of the sliding plate 309 and rapidly cooled and hardened by the lower cooling seat 310. Then, the pressing column 316 rises, and the lower through hole 320 of the sliding plate 309 moves away from the lower cooling seat 310. When the lower through hole 320 of the sliding plate 309 moves away from the lower cooling seat 310, the finished product in the lower through hole 320 of the sliding plate 309 falls downwards for collection. This process is repeated. Through the reciprocating lifting and lowering of the pressing column 316 and the reciprocating horizontal movement of the sliding plate 309, combined with the rapid cooling of the lower cooling seat 310, the finished product is formed.

[0035] The working principle of this invention is as follows: When in use, the ball mill cover 108 is opened, and construction waste sand and gravel are placed into the rotating ball mill 107. The construction waste sand and gravel fall into the grinding balls inside the rotating ball mill 107. Then the ball mill cover 108 is closed, and the drive motor 102 drives the main drive shaft 103 to rotate through gear transmission. The main drive shaft 103 drives the rotating ball mill 107 to rotate through the friction wheel 111. The rotating ball mill 107 drives the construction waste sand and gravel inside it and the grinding balls to rotate together. The sand and gravel are ground by the grinding balls. At the same time, the blower 104 blows air downward through the air pipe 105 to lift the sand and gravel that has been crushed by the grinding balls. At the same time, the air pump 110 draws air to draw the lifted sand and gravel into the exhaust pipe 109.

[0036] Air pump 110 draws the polished sand and gravel into mixing box 201 through inlet pipe 202. The sand and gravel are blown onto impeller 206. Small dust particles leave through ventilation groove 205. The through holes on impeller 206 allow airflow to pass directly through. Only when the sand and gravel are blown onto the blades of impeller 206 will impeller 206 rotate. The rotation of impeller 206 drives inner drive wheel 207 to rotate, which in turn drives outer drive wheel 210 and distribution impeller 209 to rotate counterclockwise through drive belt 208. This causes the adhesive fluid in distribution impeller 209 to flow into mixing box 201 in a metered manner along adhesive pipe 204, thus matching the amount of adhesive according to the amount of sand and gravel entering.

[0037] The main drive shaft 103 drives the inner bevel gear 305 and the outer bevel gear 304 to rotate via the bevel gear 306. The outer bevel gear 304 drives the middle gear 303 to rotate, and the middle gear 303 drives the roller gear 302 and the mixing roller 301 below the rightmost kneading module to rotate. Subsequently, it drives the roller gear 302 and the mixing roller 301 above the rightmost kneading module to rotate. Each adjacent kneading module drives each other, ultimately causing all the mixing rollers 301 to rotate together, with the upper and lower mixing rollers 301 rotating in opposite directions. The leftmost kneading module... The roller gear 302 on the upper mixing roller 301 drives the upper gear 311 and the eccentric rotating column 312 to rotate. The roller gear 302 drives the rotating rod 313, the lifting frame 315 and the pressing column 316 to rise and fall through the slide groove 314. The roller gear 302 on the mixing roller 301 below the leftmost kneading module drives the docking gear 319 to rotate. The docking gear 319 drives the crank gear 317 and the lower crankshaft 307 to rotate. The rotation of the lower crankshaft 307 drives the sliding plate 309 to slide back and forth in the horizontal direction along the lower cooling seat 310 through the movable connecting rod 308.

[0038] The adhesive and sand / gravel fall together into the mixing roller 301, where they are mixed and conveyed. The mixed sand / gravel is then transported to the upper through-hole 321 of the upper guide plate 318. When the pressing column 316 descends, the lower through-hole 320 on the sliding plate 309 aligns with the upper through-hole 321 on the upper guide plate 318. The diameter of the lower through-hole 320 is larger than that of the upper through-hole 321. The pressing column 316 then pushes the material above the upper through-hole 321 on the upper guide plate 318 downwards. 16. The raw material is pressed into the lower through hole 320 of the sliding plate 309 and rapidly cooled and hardened by the lower cooling seat 310. Then, the pressing column 316 rises, and the lower through hole 320 of the sliding plate 309 moves away from the lower cooling seat 310. When the lower through hole 320 of the sliding plate 309 moves away from the lower cooling seat 310, the finished product in the through hole of the sliding plate 309 falls downward for collection. This process is repeated. Through the reciprocating lifting and lowering of the pressing column 316 and the reciprocating horizontal movement of the sliding plate 309, combined with the rapid cooling of the lower cooling seat 310, the finished product is formed.

[0039] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the present invention based on the technical solution and inventive concept of the present invention should be covered within the scope of protection of the present invention.

Claims

1. An apparatus for producing recycled aggregates from construction waste sand and gravel, comprising a crushing mechanism for crushing construction waste sand and gravel, characterized in that: The crushing mechanism includes an air pump (110) and a main drive shaft (103). Next to the crushing mechanism is a mixing mechanism for mixing the crushed sand and gravel with the binder. Inside the mixing mechanism is a forming mechanism for shaping the sand and gravel mixed with the binder. The mixing mechanism includes a mixing box (201), in which a mesh impeller (206) is rotatably installed. The mesh impeller (206) has multiple blades, and each blade has multiple through holes.

2. The apparatus for producing recycled aggregates from construction waste sand and gravel according to claim 1, characterized in that: The crushing mechanism includes a base plate (101), a fixed bracket (106) is fixedly installed on the base plate (101), a rotating ball mill (107) is rotatably installed on the fixed bracket (106), the rotating ball mill (107) is composed of two hemispheres, a blower pipe (105) and an exhaust pipe (109) are fixedly installed on the fixed bracket (106), the rotating ball mill (107) and the exhaust pipe (109) are rotatably connected, the rotating ball mill (107) and the blower pipe (105) are rotatably connected, one end of the exhaust pipe (109) is connected to the air pump (110), the other end of the exhaust pipe (109) is located inside the rotating ball mill (107) and the opening faces upward, the end of the blower pipe (105) is located inside the rotating ball mill (107) and the opening faces downward.

3. The apparatus for producing recycled aggregates from construction waste sand and gravel according to claim 2, characterized in that: The rotating ball mill (107) contains multiple grinding balls. After the grinding balls are loaded into the rotating ball mill (107), the height of the grinding balls is below the end of the air blower (105) inside the rotating ball mill (107).

4. The apparatus for producing recycled aggregates from construction waste sand and gravel according to claim 3, characterized in that: The crushing mechanism also includes a blower (104), which is connected to a blower pipe (105). A ball mill cover (108) is provided on the rotating ball mill (107). The main drive shaft (103) is rotatably mounted on a fixed bracket (106). A friction wheel (111) is fixedly mounted on the main drive shaft (103). The friction wheel (111) and the rotating ball mill (107) form a friction transmission. A drive motor (102) is provided next to the base plate (101). The drive motor (102) drives the main drive shaft (103) to rotate through gear transmission.

5. The apparatus for producing recycled aggregates from construction waste sand and gravel according to claim 1, characterized in that: The mixing mechanism also includes an inlet pipe (202) fixedly installed on the air pump (110), the inlet pipe (202) is connected to the mixing box (201), the mixing box (201) is provided with multiple air vents (205), the mixing box (201) is provided with an adhesive pipe (204), and the adhesive pipe (204) is connected to an external adhesive pipe.

6. The apparatus for producing recycled aggregates from construction waste sand and gravel according to claim 5, characterized in that: The mixing mechanism also includes a distribution shell (203) fixedly installed on the adhesive tube (204), a distribution impeller (209) rotatably installed inside the distribution shell (203), an outer drive wheel (210) fixedly installed on the distribution impeller (209), an inner drive wheel (207) fixedly installed on the mesh impeller (206), and a drive belt (208) wrapped around the inner drive wheel (207) and the outer drive wheel (210).

7. The apparatus for producing recycled aggregates from construction waste sand and gravel according to claim 1, characterized in that: The molding mechanism includes a lower crankshaft (307) rotatably mounted below the mixing chamber (201), a crank gear (317) fixedly mounted on the lower crankshaft (307), a movable connecting rod (308) rotatably mounted on the lower crankshaft (307), a lower cooling seat (310) fixedly mounted inside the mixing chamber (201), a cooling pipe provided inside the lower cooling seat (310), a sliding plate (309) slidably mounted on the lower cooling seat (310), a plurality of lower through holes (320) provided on the sliding plate (309), and the sliding plate (309) and the movable connecting rod (308) rotatably mounted together.

8. The apparatus for producing recycled aggregate from construction waste sand and gravel according to claim 7, characterized in that: The molding mechanism also includes an upper gear (311) rotatably mounted on a mixing box (201), an eccentric rotating column (312) fixedly mounted on the upper gear (311), a lifting frame (315) slidably mounted on the mixing box (201), a plurality of pressing columns (316) fixedly mounted on the lifting frame (315), the pressing columns (316) matching the lower through holes (320) on the sliding plate (309), an upper guide plate (318) fixedly mounted inside the mixing box (201), a plurality of upper through holes (321) provided on the upper guide plate (318), the upper through holes (321) matching the pressing columns (316), a rotating rod (313) fixedly mounted on the lifting frame (315), a sliding groove (314) provided on the rotating rod (313), and the eccentric rotating column (312) sliding in the sliding groove (314).

9. The apparatus for producing recycled aggregate from construction waste sand and gravel according to claim 8, characterized in that: The molding mechanism also includes an intermediate gear (303) and an outer gear (304) rotatably mounted on the mixing box (201). The intermediate gear (303) meshes with the outer gear (304). An inner bevel gear (305) is fixedly mounted on the outer gear (304). A spur bevel gear (306) is fixedly mounted on the main drive shaft (103). The spur bevel gear (306) meshes with the inner bevel gear (305). A mating gear (319) is rotatably mounted below the mixing box (201). The mating gear (319) meshes with the crank gear (317).

10. The apparatus for producing recycled aggregate from construction waste sand and gravel according to claim 9, characterized in that: The mixing box (201) is equipped with four sets of kneading modules. Each kneading module includes two mixing rollers (301) on the top and bottom. Roller gears (302) are fixedly installed on the mixing rollers (301). Soft protrusions are provided on the mixing rollers (301). The roller gears (302) on the upper mixing roller (301) mesh with the roller gears (302) on the adjacent lower mixing roller (301). The roller gears (302) on the mixing roller (301) closest to the middle gear (303) mesh with the middle gear (303). The roller gears (302) on the mixing roller (301) closest to the upper gear (311) mesh with the upper gear (311). The roller gears (302) on the lower mixing roller (301) mesh with the docking gear (319).

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