A processing device and method for recycling and reusing construction stone waste

Abstract

This invention discloses a processing device and method for recycling and reusing construction stone waste, relating to the technical field of construction solid waste treatment equipment. The invention aims to solve the problems of low suction efficiency and easy clogging caused by fixed suction heads in existing recycling devices, and high cost and poor matching due to independent power for crushing and screening. The device includes a support frame, a screening component, a crushing component, a feeding component, and a recycling component. The recycling component is equipped with a liftable negative pressure suction unit, which synchronously drives the crushing and screening actions through a single motor and triangular transmission. Unqualified stone is conveyed to the feed inlet under negative pressure for secondary crushing. This invention allows for flexible adjustment of the suction height, improving suction efficiency, reducing dust pollution, simplifying the power system, reducing equipment costs and energy consumption, and improving the production efficiency and finished product qualification rate of recycled aggregates.

Description

Technical Field

[0001] This invention relates to the field of construction solid waste treatment equipment technology, specifically to a processing device and method for recycling and reusing construction stone waste. Background Technology

[0002] This invention relates to the field of construction solid waste treatment equipment technology, specifically to a processing device and method for recycling and reusing construction stone waste. With the increasing amount of stone waste generated during building demolition and construction, processing it into recycled aggregate for recycling is an important way to solve the pollution caused by construction solid waste accumulation and alleviate the shortage of natural sand and gravel resources. Crushing, screening, and re-crushing of unqualified materials are the core processes in the recycling and processing of construction stone waste, and the performance of the equipment directly determines the production efficiency and environmental protection level of the recycled aggregate.

[0003] In existing technologies, such as the construction waste crushing, screening, and circulating device disclosed in Chinese patent CN218796897U, the circulating conveying mechanism adopts a fixed negative pressure suction head structure. It cannot adjust the suction height according to the actual accumulation of unqualified stones on the guide plate. When the stone accumulation is thin, the suction is insufficient, resulting in incomplete suction. When the accumulation is thick, it is easy to cause material jamming and blockage. Moreover, the gas-solid separation effect is poor, and the dust pollution during the processing is serious. At the same time, the crushing and screening mechanisms of this device are driven by independent power systems, which not only increases the equipment manufacturing cost and floor space, but also makes it difficult to accurately match the operating speeds of the two mechanisms, which can easily cause material accumulation on the screen and affect the overall processing efficiency. Summary of the Invention

[0004] (a) Technical problems to be solved To address the shortcomings of existing technologies, this invention provides a processing apparatus and method for recycling and reusing construction stone waste, thus solving the aforementioned problems.

[0005] (II) Technical Solution To achieve the above objectives, the present invention provides the following technical solution: a processing device and method for recycling and reusing construction stone waste, comprising a support, a screening component, a crushing component, a feeding component, and a circulation component; the screening component is fixedly connected to the upper middle part of the support, and the crushing component is fixedly connected to the other upper end of the support; the feeding component is provided through the top of the crushing component, and the bottom discharge end of the crushing component corresponds vertically to the feed end of the screening component; the circulation component is fixedly connected to the upper end of the support, and the circulation component is equipped with a liftable negative pressure suction unit, the discharge end of which is connected to the feeding component, for negative pressure conveying the stone that does not meet the particle size requirements after screening to the crushing component for secondary crushing.

[0006] Preferably, the screening assembly includes a screen frame, with grooves at both ends inside the screen frame, a movable plate slidably connected inside the grooves, a screen plate fixedly connected to the inner end of the movable plate, a connecting column fixedly connected to the outside of the movable plate, and a connecting rod rotatably connected to the outside of the connecting column.

[0007] Preferably, the crushing assembly includes a mounting frame, with a crushing shell fixedly connected to the upper end of the mounting frame; a rotating shaft is rotatably connected to one inner end of the crushing shell, a crushing roller is fixedly connected to the inner portion of the rotating shaft, and a gear and a pulley are fixedly connected to the outer portion of the rotating shaft; a rotating shaft is rotatably connected to the other inner end of the crushing shell, a crushing roller is fixedly connected to the inner portion of the rotating shaft, and a gear is fixedly connected to the outer portion of the rotating shaft, with the gear meshing with each other.

[0008] Preferably, a motor is fixedly connected to the bottom of the support near the feeding assembly, and a pulley is fixedly connected to the output end of the motor. A pulley is rotatably connected to the end of the screen frame near the pulley. A triangular belt is fitted on the pulleys 1, 2, and 3. A turntable is fixedly connected to the outside of the pulley 1, and a cam is eccentrically rotatably connected to the outside of the turntable. The other end of the cam is connected to a connecting rod. A discharge port is provided through the bottom of the crushing shell, and the discharge port corresponds to the top of the screen plate.

[0009] Preferably, the liftable negative pressure suction unit includes a fixed frame, a bidirectional screw is rotatably connected to the upper center of the fixed frame, two threaded blocks are threadedly engaged on the bidirectional screw, a second motor is fixedly connected to the outside of the fixed frame, and the output end of the second motor is connected to the bidirectional screw; the lower ends of the two threaded blocks are rotatably connected to the second connecting rod, and the lower ends of the two second connecting rods are rotatably connected to a movable frame, the movable frame is slidably connected to the fixed frame, and a negative pressure suction head is fixedly connected to the lower end of the movable frame.

[0010] Preferably, a connecting pipe is provided through the top of the negative pressure suction head, the feeding assembly includes a feeding port, a cyclone separator is fixedly connected to one end of the feeding port, the other end of the connecting pipe is provided through the interior of the cyclone separator, and the top of the cyclone separator is connected to the negative pressure pump through a pipe.

[0011] Preferably, a collection box is provided at the bottom of the support, and the collection box corresponds to the screen plate above and below; the screening component is a through design, and a guide plate is fixedly connected to one of the lower ends of the screening component, and the discharge end of the guide plate corresponds to the working area of ​​the negative pressure suction head.

[0012] A method for recycling and reusing construction stone waste includes the following steps: S1 Primary Crushing: Construction stone waste is fed into the feeding assembly, and the crushing assembly crushes the stone by pressing it against each other. The crushed stone falls through the discharge port onto the screen plate of the screening assembly. S2 Synchronous Grading and Screening: Motor 1 drives the crushing and screening components synchronously via a V-belt, causing the screen plate to move in a straight reciprocating motion along the chute. Finished stone materials that meet the particle size requirements pass through the screen plate and fall into the collection box, while stone materials that do not meet the particle size requirements slide down the guide plate to the working area of ​​the circulation component. S3 Liftable Negative Pressure Circulation: Adjust the liftable negative pressure suction unit of the circulation component to a suitable height, and transport the unqualified stone to the feeding component through negative pressure, and return it to the crushing component for secondary crushing. Repeat the screening and crushing process until all the stone meets the particle size requirements.

[0013] Preferably, in step S3, the height adjustment process of the liftable negative pressure suction unit is as follows: the motor drives the bidirectional screw to rotate, which drives the two threaded blocks to move towards or away from each other. The movable frame is driven to rise and fall along the fixed frame through the connecting rod, thereby adjusting the distance between the negative pressure suction head and the guide plate. The negative pressure conveying process is as follows: the negative pressure pump forms negative pressure inside the cyclone separator, which causes the negative pressure suction head to generate suction, sucking the unqualified stone into the cyclone separator through the connecting pipe. After separation, the stone falls into the feed inlet to complete the cycle.

[0014] (III) Beneficial Effects This invention provides a processing apparatus and method for recycling and reusing construction stone waste. It has the following beneficial effects: 1. This invention employs a liftable negative pressure suction unit to construct a closed-loop circulating processing structure. A bidirectional screw and connecting rod mechanism drives the negative pressure suction head to precisely lift and lower, allowing for flexible adjustment of the suction height based on the stone accumulation state. Combined with a cyclone separator, it achieves dust-free automatic conveying and secondary crushing of substandard stones. Simultaneously, a single-motor triangular transmission structure synchronously drives the crushing and screening actions, simplifying the power system layout, effectively reducing equipment energy consumption and manufacturing costs, and solving the problems of low suction efficiency, easy clogging, and severe dust pollution associated with traditional circulating devices.

[0015] 2. This device adopts a through-type screening structure with a guide plate to automatically separate qualified finished products from unqualified stone materials, eliminating the need for manual sorting. Each core component features a modular design, allowing for quick replacement of easily worn parts such as screen plates and wear-resistant liners, facilitating convenient maintenance. The device has a compact overall structure and stable operation, enabling continuous crushing, screening, and recycling of construction stone waste, significantly improving the production efficiency and finished product qualification rate of recycled aggregates. Attached Figure Description

[0016] Figure 1This is a schematic diagram of the overall structure of a processing device and method for recycling and reusing building stone waste proposed in this invention. Figure 2 This is a schematic diagram of the screening component of a recycling and processing device and method for building stone waste proposed in this invention. Figure 3 This is a top view of a processing device and method for recycling and reusing construction stone waste proposed in this invention; Figure 4 This is a schematic diagram of the crushing component of a recycling and processing device and method for building stone waste proposed in this invention. Figure 5 This is a schematic diagram of the transmission components of a processing device and method for recycling and reusing building stone waste proposed in this invention. Figure 6 This is a schematic diagram of the negative pressure component of a processing device and method for recycling and reusing building stone waste proposed in this invention.

[0017] The components are as follows: 1. Support frame; 11. Collection box; 12. Guide plate; 2. Screening assembly; 21. Screen frame; 22. Screen plate; 23. Connecting column; 24. Movable plate; 25. Connecting rod one; 26. Slide chute; 27. Motor one; 28. Pulley one; 29. ​​Turntable; 210. Cam; 211. Pulley two; 212. Belt; 3. Crushing assembly; 31. Mounting frame; 32. Crushing shell; 4. Feeding assembly. ; 41. Feed inlet; 42. Cyclone separator; 43. Discharge outlet; 44. Crushing roller one; 45. Rotating shaft one; 46. Belt pulley three; 47. Gear one; 48. Crushing roller two; 49. Gear two; 410. Rotating shaft two; 5. Circulation assembly; 51. Fixed frame; 52. Connecting pipe; 53. Motor two; 54. Movable frame; 55. Bidirectional screw; 56. Negative pressure suction head; 57. Connecting rod two; 58. Threaded block. Detailed Implementation

[0018] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0019] Example 1: Reference Figure 1-6 This invention provides a processing device for recycling and reusing construction stone waste, including a support 1, a screening component 2, a crushing component 3, a feeding component 4, and a circulation component 5.

[0020] like Figure 1As shown, the support frame 1 is a frame structure welded from structural steel, providing stable support for the entire device. A screening component 2 is bolted to the upper center of the support frame 1, and a crushing component 3 is bolted to the other upper end of the support frame 1. A feeding component 4 is welded through the top of the crushing component 3, and the bottom discharge end of the crushing component 3 corresponds vertically to the feed end of the screening component 2, ensuring that the crushed stone can fall directly into the screening area. A circulation component 5 is bolted to the upper end of the support frame 1, spanning above the discharge end of the screening component 2. Its discharge end is connected to the feeding component 4, forming a closed-loop processing system.

[0021] like Figure 2 As shown, the screening assembly 2 includes a screen frame 21, which is a rectangular frame structure. Slide grooves 26 are formed along the length of both ends of the frame. A movable plate 24 is slidably connected inside the slide grooves 26. A screen plate 22 is bolted to the inner end of the movable plate 24. The screen plate 22 is made of high-manganese steel and has uniformly distributed screen holes on its surface, suitable for the conventional screening needs of recycled building aggregates. A connecting column 23 is welded to the outside of the movable plate 24, and a connecting rod 25 is rotatably connected to the outside of the connecting column 23 via a pin. The slide grooves 26 and the movable plate 24 are fitted with a clearance fit, ensuring smooth reciprocating movement of the screen plate 22 while preventing stone debris from entering the slide grooves 26 and causing jamming.

[0022] like Figure 3 , Figure 4 As shown, the crushing assembly 3 includes a mounting frame 31, which is bolted to the bracket 1. A crushing shell 32 is welded to the upper end of the mounting frame 31. A rotating shaft 45 is rotatably connected to one inner end of the crushing shell 32 via a bearing. A crushing roller 44 is fixedly connected to the inner portion of the rotating shaft 45 via a key. A gear 47 and a pulley 46 are fixedly connected to the outer portion of the rotating shaft 45 via keys. A rotating shaft 410 is rotatably connected to the other inner end of the crushing shell 32 via a bearing. A crushing roller 48 is fixedly connected to the inner portion of the rotating shaft 410 via a key. A gear 49 is fixedly connected to the outer portion of the rotating shaft 410 via a key. Gears 47 and 49 mesh with each other, ensuring that crushing rollers 44 and 48 rotate in opposite directions at the same speed, achieving uniform crushing of the stone.

[0023] A motor 27 is bolted to the bottom of the support frame 1 near the feeding assembly 4, providing synchronous power for crushing and screening. The output of the motor 27 is keyed to a pulley 211, and the end of the screen frame 21 near pulley 211 is rotatably connected to a pulley 28 via a bearing. A triangular belt 212 is fitted onto pulleys 28, 211, and 46, enabling the transmission of large torque and smooth operation. A turntable 29 is bolted to the outer side of pulley 28, and a cam 210 is rotatably connected to the outer eccentric position of the turntable 29 via a pin. The other end of the cam 210 is connected to a connecting rod 25 via a pin. A discharge port 43 is provided through the bottom of the crushing shell 32, corresponding to the upper center of the screen plate 22, ensuring that the crushed stone is evenly distributed on the screen plate 22.

[0024] like Figure 5 , Figure 6 As shown, the circulation component 5 includes a fixed frame 51, which is bolted to the upper end of the support 1. A bidirectional screw 59 is rotatably connected to the upper center of the fixed frame 51 via a bearing; the two ends of the bidirectional screw 59 have opposite thread directions. Two symmetrically arranged threaded blocks 58 are threaded onto the bidirectional screw 59. A motor 53 is bolted to the outside of the fixed frame 51, and its output end is coaxially fixed to the end of the bidirectional screw 59 via a coupling. The lower ends of the two threaded blocks 58 are rotatably connected to connecting rods 57 via pins, and the lower ends of the two connecting rods 57 are rotatably connected to a movable frame 54 via pins. The two sides of the movable frame 54 are slidably connected to the lower part of the fixed frame 51 via guide rails and sliders. The guide rails are linear guide rails to ensure the stability of the movable frame 54 during lifting. A negative pressure suction head 56 is bolted to the lower end of the movable frame 54. The negative pressure suction head 56 has a flared structure and can cover the entire area of ​​the screen plate 22.

[0025] A connecting pipe 52 is welded through the top of the negative pressure suction head 56. The connecting pipe 52 is a flexible hose with good flexibility, which can adapt to the lifting and lowering movement of the negative pressure suction head 56. The feeding assembly 4 includes a feeding port 41. One end of the feeding port 41 is fixedly connected to a cyclone separator 42 by bolts. The other end of the connecting pipe 52 is connected through a flange inside the cyclone separator 42. The top of the cyclone separator 42 is connected to an external negative pressure pump through a pipe, which can provide sufficient negative pressure suction to transport the stone.

[0026] like Figure 1 As shown, a collection box 11 is placed at the bottom of the support 1. The collection box 11 corresponds to the screen plate 22 above and below, and is used to collect the finished stone material after screening. The screening component 2 has a through structure design. One end of it is fixedly connected to the guide plate 12 by bolts, which can ensure that the unqualified stone material slides smoothly into the working area of ​​the negative pressure suction head 56 under the action of gravity.

[0027] Example 2 The difference between this embodiment and Embodiment 1 is that the sieve plate 22 and the movable plate 24 are connected by detachable bolts, and the sieve plate 22 with different sieve hole sizes can be replaced according to different finished product particle size requirements to meet the production needs of recycled aggregates of different specifications.

[0028] Meanwhile, several parallel guide strips are welded to the surface of the guide plate 12, which can prevent unqualified stones from accumulating during the sliding process, ensure that the stones are evenly distributed below the negative pressure suction head 56, and improve the suction efficiency.

[0029] Example 3 The difference between this embodiment and Embodiment 1 is that a wear-resistant liner is bolted to the inner wall of the crushing shell 32. The wear-resistant liner is made of high-chromium cast iron, which can effectively resist the impact and wear of stones and extend the service life of the crushing shell 32. The wear-resistant liner and the crushing shell 32 are connected by countersunk bolts, with the bolt heads flush with the surface of the liner to prevent stones from getting stuck at the bolt connection.

[0030] In addition, a rubber sealing strip is fixedly connected to the edge of the negative pressure suction head 56 by bolts, which can reduce the gap between the negative pressure suction head 56 and the sieve plate 22, reduce air leakage, improve the utilization rate of negative pressure suction, and reduce energy consumption.

[0031] Those skilled in the art can connect all electrical components and their compatible power supplies in this case via wires, and should select a suitable PLC controller according to the actual situation to meet the automatic control requirements. The specific connection and control sequence should be completed by referring to the working sequence of each electrical component in the aforementioned working principle. The detailed connection methods are well-known in the art. This section mainly introduces the structure and implementation of the device, and will not elaborate further on the electrical control.

[0032] Working principle: Before use, connect the external negative pressure pump to the top of the cyclone separator 42 through a pipeline to complete the power and pipeline preparation of the device. Start motor 27. The output end of motor 27 drives pulley 211 to rotate. The belt 212, which is arranged in a triangular state, synchronously drives pulley 28 and pulley 46 to rotate, so that a single power source can drive the crushing component 3 and the screening component 2 to work at the same time.

[0033] When the crushing assembly 3 is working, the pulley 3 46 drives the rotating shaft 1 45 to rotate. Through the meshing gears 1 47 and 2 49, the rotating shaft 2 410 is driven to rotate in the opposite direction, thereby causing the crushing roller 1 44 and crushing roller 2 48 to produce a crushing action by rotating in opposite directions. Construction stone waste is fed into the crushing shell 32 through the feed inlet 41. After being crushed by the opposing crushing of the two crushing rollers, the stone is discharged from the discharge outlet 43 at the bottom of the crushing shell 32 and falls above the screen plate 22 of the screening assembly 2 below.

[0034] When the screening component 2 is working, the pulley 28 drives the turntable 29 to rotate synchronously. The eccentrically mounted cam 210 on the turntable 29 then performs a circular motion, which pulls the connecting column 23 through the connecting rod 25. This, in turn, drives the movable plate 24 to perform a linear reciprocating motion along the sliding grooves 26 at both ends of the screen frame 21, ultimately causing the screen plate 22 to produce a high-frequency reciprocating screening action. Finished stone materials that meet the particle size requirements pass through the screen holes of the screen plate 22 and fall into the collection box 11 at the bottom of the support 1 for collection. Large stones that do not meet the particle size requirements move towards one end of the screening component 2 under the reciprocating motion of the screen plate 22 and slide down the guide plate 12 below the through-type screening component 2 to the negative pressure suction operation area of ​​the circulation component 5.

[0035] When the circulation component 5 is working, based on the amount of unqualified stone material accumulated on the guide inclined plate 12, the motor 53 is started to drive the bidirectional screw 59 to rotate, causing the two threaded blocks 58 to move towards or away from each other along the bidirectional screw 59. Through the pushing and pulling action of the two connecting rods 57, the movable frame 54 is driven to slide up and down along the fixed frame 51, thereby adjusting the distance between the negative pressure suction head 56 and the screen plate 22 to ensure the best suction effect. After the adjustment is completed, the external negative pressure pump is started to create a negative pressure environment inside the cyclone separator 42. Through the connecting pipe 52, the negative pressure suction head 56 generates continuous suction, sucking the unqualified stone material on the guide inclined plate 12 into the connecting pipe 52 and conveying it into the cyclone separator 42. Under the centrifugal force of the cyclone separator 42, the stone material separates from the airflow and falls into the feed inlet 41 below, and re-enters the crushing component 3 for secondary crushing. The above screening and crushing process is repeated until all the stone material meets the particle size requirements and falls into the collection box 11.

[0036] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A processing device and method for recycling and reusing construction stone waste, characterized in that, The system includes a support (1), a screening component (2), a crushing component (3), a feeding component (4), and a circulation component (5). The screening component (2) is fixedly connected to the upper middle part of the support (1), and the crushing component (3) is fixedly connected to the other upper end of the support (1). The feeding component (4) is provided through the top of the crushing component (3), and the bottom discharge end of the crushing component (3) corresponds vertically to the feed end of the screening component (2). The circulation component (5) is fixedly connected to the upper end of the support (1). The circulation component (5) is equipped with a liftable negative pressure suction unit. The discharge end of the liftable negative pressure suction unit is connected to the feeding component (4) and is used to negatively transport the stone material that does not meet the particle size requirements after screening to the crushing component (3) for secondary crushing.

2. The recycling and processing device for construction stone waste according to claim 1, characterized in that: The screening assembly (2) includes a screen frame (21), with sliding grooves (26) at both ends inside the screen frame (21). A movable plate (24) is slidably connected inside the sliding groove (26), and a screen plate (22) is fixedly connected to the inner end of the movable plate (24). A connecting column (23) is fixedly connected to the outside of the movable plate (24), and a connecting rod (25) is rotatably connected to the outside of the connecting column (23).

3. The recycling and processing device for construction stone waste according to claim 2, characterized in that: The crushing assembly (3) includes a mounting frame (31), and a crushing shell (32) is fixedly connected to the upper end of the mounting frame (31). A rotating shaft (45) is rotatably connected to one end of the inner side of the crushing shell (32). A crushing roller (44) is fixedly connected to the inner end of the rotating shaft (45). A gear (47) and a pulley (46) are fixedly connected to the outer side of the rotating shaft (45). A rotating shaft (410) is rotatably connected to the other end of the inner side of the crushing shell (32). A crushing roller (48) is fixedly connected to the inner side of the rotating shaft (410). A gear (49) is fixedly connected to the outer side of the rotating shaft (410). The gear (47) and the gear (49) mesh with each other.

4. The recycling and processing device for construction stone waste according to claim 3, characterized in that: A motor (27) is fixedly connected to the bottom of the support (1) near the feeding assembly (4). A pulley (211) is fixedly connected to the output end of the motor (27). A pulley (28) is rotatably connected to the end of the screen frame (21) near the pulley (211). A triangular belt (212) is fitted on the pulley (28), pulley (211) and pulley (46). A turntable (29) is fixedly connected to the outside of the pulley (28). A cam (210) is eccentrically rotatably connected to the outside of the turntable (29). The other end of the cam (210) is connected to the connecting rod (25). A discharge port (43) is provided through the bottom of the crushing shell (32). The discharge port (43) corresponds to the top of the screen plate (22).

5. The recycling and processing device for construction stone waste according to claim 1, characterized in that: The liftable negative pressure suction unit includes a fixed frame (51), a bidirectional screw (59) is rotatably connected to the upper center of the fixed frame (51), two threaded blocks (58) are threaded on the bidirectional screw (59), a motor (53) is fixedly connected to the outside of the fixed frame (51), and the output end of the motor (53) is connected to the bidirectional screw (59); the lower ends of the two threaded blocks (58) are rotatably connected to the connecting rods (57), and the lower ends of the two connecting rods (57) are rotatably connected to the movable frame (54), the movable frame (54) is slidably connected to the fixed frame (51), and the lower end of the movable frame (54) is fixedly connected to the negative pressure suction head (56).

6. The recycling and processing device for construction stone waste according to claim 5, characterized in that: The top of the negative pressure suction head (56) is provided with a connecting pipe (52). The feeding assembly (4) includes a feeding port (41). One end of the feeding port (41) is fixedly connected to a cyclone separator (42). The other end of the connecting pipe (52) is provided inside the cyclone separator (42). The top of the cyclone separator (42) is connected to the negative pressure pump through a pipe.

7. The recycling and processing device for construction stone waste according to claim 1, characterized in that: The bottom of the support (1) is provided with a collection box (11), which corresponds to the screen plate (22) vertically; the screening component (2) is a through design, and a guide plate (12) is fixedly connected to the lower end of the screening component (2), and the discharge end of the guide plate (12) corresponds to the working area of ​​the negative pressure suction head (56).

8. A method for recycling and reusing construction stone waste, characterized in that, The processing apparatus according to any one of claims 1-7 includes the following steps: S1 Initial crushing: The construction stone waste is fed into the feeding component (4), and the stone is crushed by the crushing component (3). The crushed stone falls into the screen plate (22) of the screening component (2) through the discharge port (43). S2 Synchronous Grading and Screening: Motor 1 (27) synchronously drives the crushing component (3) and the screening component (2) through the V-belt (212), causing the screen plate (22) to move in a straight line along the chute (26). Finished stone materials that meet the particle size requirements pass through the screen plate (22) and fall into the collection box (11), while stone materials that do not meet the particle size requirements slide down the guide plate (12) to the working area of ​​the circulation component (5). S3 Liftable Negative Pressure Circulation: Adjust the liftable negative pressure suction unit of the circulation component (5) to a suitable height, and transport the unqualified stone to the feeding component (4) through negative pressure, and return it to the crushing component (3) for secondary crushing. Repeat the screening and crushing process until all the stone meets the particle size requirements.

9. A method for recycling and reusing construction stone waste according to claim 8, characterized in that, In step S3, the height adjustment process of the liftable negative pressure suction unit is as follows: motor two (53) drives the bidirectional screw (59) to rotate, which drives the two threaded blocks (58) to move towards or away from each other. The movable frame (54) is driven to rise and fall along the fixed frame (51) through the connecting rod two (57), thereby adjusting the distance between the negative pressure suction head (56) and the guide plate (12). The negative pressure conveying process is as follows: the negative pressure pump forms negative pressure inside the cyclone separator (42), which causes the negative pressure suction head (56) to generate suction, sucking the unqualified stone into the cyclone separator (42) through the connecting pipe (52), and after separation, it falls into the feed port (41) to complete the cycle.

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