Construction waste crushing device and crushing method thereof

Abstract

The application belongs to the technical field of building waste treatment, and particularly discloses a building waste crushing device, which comprises a crushing support, a feeding channel is arranged at the top of the crushing support, a discharge bin is arranged at one side of the crushing support, a crushing shell is arranged at the top of the discharge bin, a feeding port is arranged at one side of the crushing shell, the feeding port is communicated with the feeding channel, a driving cutter head and a passive cutter head are arranged in the crushing shell, the top of the passive cutter head is connected with a cover plate through a buffer assembly, and a plurality of arc surfaces are arranged on the passive cutter head. Based on the device, the application further discloses a method for crushing building waste by using the device. The active cutter head and the passive cutter head are combined to crush the building waste, the buffer assembly is arranged at the top of the passive cutter head, when the building waste with a size exceeding a preset threshold value enters the feeding port, the building waste will lift the cover plate under the action of the buffer assembly, so that the linkage mechanism can rotate along the connecting sleeve, and the cutter head can be protected.

Description

Technical Field

[0001] This invention belongs to the field of construction waste treatment technology, and specifically relates to a construction waste crushing device and its crushing method. Background Technology

[0002] After construction is completed, or after renovation or repair, a large amount of slag, waste concrete, waste bricks and stones, and other waste are generated. Direct disposal of these materials not only causes environmental pollution but also wastes resources. With technological advancements and increasingly stringent environmental protection requirements, construction waste can be processed into new building materials. Therefore, the crushing and processing of construction waste is currently the main method for its reuse.

[0003] Chinese patent CN211303312U discloses a construction waste crushing device. By setting a crushing tooth assembly on the crushing shaft, construction waste can be continuously crushed until it meets the particle size requirements. However, construction waste contains high-hardness materials such as reinforced concrete blocks, and using existing crushing equipment can easily burn out the motor or damage the crushing shaft during crushing. Summary of the Invention

[0004] The purpose of this invention is to overcome the shortcomings of existing technologies where the crushing process easily damages the crushing equipment, and to provide a construction waste crushing device and its crushing method.

[0005] In a first aspect, the present invention provides a construction waste crushing device, including a crushing support, a feeding channel provided at the top of the crushing support; a discharge bin provided on one side of the crushing support, a crushing shell provided at the top of the discharge bin, a feeding port provided on one side of the crushing shell, the feeding port communicating with the feeding channel, a discharge port provided at the bottom of the crushing shell, the discharge port communicating with the discharge bin, and a dust removal device provided at the discharge port.

[0006] The crushing shell consists of a base, side plates, and a cover plate. There are two side plates, which are located on both sides of the base and are movably connected to the base. The cover plate is located on top of the side plates and is fixedly connected to the side plates.

[0007] The base is equipped with a rotating roller inside, which is rotatably connected to the base via a rotating shaft. One end of the rotating shaft is equipped with a pulley, and a first motor is equipped on the outside of the base. The first motor is connected to the pulley via a belt drive. A plurality of active cutter heads are evenly arranged on the outer surface of the rotating roller.

[0008] A passive cutter head is provided at the bottom of the cover plate. The top of the passive cutter head is connected to the cover plate through a buffer assembly. Several passive cutter heads are provided along the arc surface, and each passive cutter head corresponds to an active cutter head.

[0009] A further embodiment is that the side plate and the base are connected by a linkage mechanism;

[0010] A connecting shaft is provided on the side of the base away from the feed inlet, and both ends of the connecting shaft extend to the outside of the base; bearings are sleeved on both ends of the connecting shaft;

[0011] The linkage mechanism includes an arc-shaped connecting rod, one end of which is provided with a connecting plate and the other end with a connecting sleeve; the connecting sleeve is sleeved on the bearing, and the connecting plate is fixedly connected to the side plate by bolts. When construction waste exceeding the preset threshold size enters the feed inlet, the construction waste will lift the cover plate under the action of the buffer component, so that the linkage mechanism rotates along the connecting sleeve.

[0012] A further embodiment is that the passive cutter head is provided with a mounting back plate at the top, and a slot is provided at the bottom of the mounting back plate. The passive cutter head is engaged with the slot, and a connecting ear is provided at the top of the mounting back plate for connecting a buffer assembly.

[0013] The buffer assembly includes a telescopic rod, a base, and a stop; a spring is sleeved on the telescopic rod, the top of the telescopic rod passes through the stop and is fixedly connected to the stop, the bottom of the telescopic rod is fixedly connected to the base, and the base and the connecting lug are rotatably connected by a pin.

[0014] The top of the telescopic rod extends to the outside of the cover plate and is connected to the cover plate by fixing bolts.

[0015] A further embodiment includes a support base on the mounting back plate, with support rods on both sides of the support base, and the top of the support rods being fixedly connected to the bottom of the cover plate.

[0016] A further embodiment is that the dust removal equipment includes a dust collector and a dust collection pipe, wherein the dust collection pipe connects the dust collector and the discharge port.

[0017] A further embodiment is that an iron removal frame is provided at the top of the feeding channel, and several cylinders are provided inside the iron removal frame. The output end of the cylinders is connected to an electromagnetic adsorption disk.

[0018] The upper surface of the feeding channel has several through holes, the position and number of which are adapted to the cylinder, so that the electromagnetic adsorption disk extends along the through holes into the inside of the feeding channel under the drive of the cylinder.

[0019] A further embodiment is that a linkage slide plate is provided on the top of the cylinder, and the bottom of the linkage slide plate is connected to several cylinders.

[0020] The side of the linkage slide plate is provided with at least two threaded holes, and a lead screw is provided inside the threaded holes. One end of the lead screw extends to the outside of the iron removal frame and is axially connected to a second motor. The other end of the lead screw is rotatably connected to the inner wall of the iron removal frame. The second motor is fixedly installed on the outside of the iron removal frame.

[0021] The through hole is a long strip-shaped sliding groove structure. The linkage slide plate, driven by the second motor and the lead screw, drives the cylinder and the electromagnetic adsorption disk to slide inside the long strip-shaped sliding groove structure to increase the adsorption area.

[0022] A further embodiment is that a first conveyor belt is provided inside the feeding channel, and the feeding end and the discharging end of the feeding channel are respectively connected to the two ends of the first conveyor belt.

[0023] The outer ring of the first conveyor belt is provided with a wear-resistant layer.

[0024] A further embodiment is that a second conveyor belt is provided at the bottom of the discharge hopper, and the second conveyor belt extends to the outside of the crushing support;

[0025] The second conveyor belt is provided with an iron removal frame at one end near the crushing support, and the iron removal frame is fixedly connected to the crushing support;

[0026] The iron removal frame is equipped with several cylinders, and the output end of each cylinder is connected to an electromagnetic adsorption plate; a linkage slide plate is provided on the top of each cylinder, and the bottom of the linkage slide plate is connected to several cylinders.

[0027] The side of the linkage slide plate is provided with at least two threaded holes, and a lead screw is provided inside the threaded holes. One end of the lead screw extends to the outside of the iron removal frame and is axially connected to a second motor. The other end of the lead screw is rotatably connected to the inner wall of the iron removal frame. The second motor is fixedly installed on the outside of the iron removal frame. Under the drive of the second motor and the lead screw, the linkage slide plate drives the cylinder and the electromagnetic adsorption disk to slide on the top of the second conveyor belt to increase the adsorption area.

[0028] A second aspect of the present invention provides a method for crushing construction waste, using the above-described construction waste crushing apparatus, comprising:

[0029] Start the power supply for controlling the cylinder, the first motor, the second motor, the first conveyor belt, the second conveyor belt, and the electromagnetic adsorption plate, and put the construction waste to be crushed into the feeding channel;

[0030] The cylinder drives the electromagnetic adsorption disk to move downward to the set position to adsorb the iron waste in the first conveyor belt. During this process, the linkage slide plate drives the cylinder and the electromagnetic adsorption disk to slide inside the long strip slide structure under the drive of the second motor and the lead screw to increase the adsorption area.

[0031] Construction waste enters the feed inlet under the action of the first conveyor belt. The first motor drives the rotating roller to rotate. The active cutter head and the passive cutter head squeeze and crush the construction waste. During this process, the construction waste squeezes the passive cutter head, so that the back plate squeezes the telescopic rod and compresses the spring. When the spring is compressed to its shortest length, the cover plate is lifted up, so that the linkage mechanism rotates along the connecting sleeve, which plays a protective role.

[0032] The crushed construction waste falls into the discharge hopper and is then conveyed to a designated location via a second conveyor belt at the bottom of the discharge hopper. During this process, the linkage slide plate, driven by the second motor and the lead screw, drives the cylinder and the electromagnetic adsorption plate to slide on the top of the second conveyor belt to increase the adsorption area.

[0033] After the construction waste is crushed, the electromagnetic adsorption plate is de-energized. The iron waste adsorbed by the electromagnetic adsorption plate falls onto the first and second conveyor belts. The first conveyor belt rotates in the opposite direction, and the second conveyor belt rotates in the forward direction to complete the collection of iron waste.

[0034] Compared with existing technologies, the advantages of this invention are as follows: This invention uses a combination of active and passive cutters to crush construction waste, and a buffer assembly is provided on the top of the passive cutter. When construction waste exceeding a preset threshold size enters the feed inlet, the buffer assembly causes the waste to lift the cover plate, allowing the linkage mechanism to rotate along the connecting sleeve, thus protecting the cutter. Furthermore, a spring on the telescopic rod allows the lifted cover plate to automatically return to its original position.

[0035] This invention can collect iron waste from construction waste separately by setting up an iron removal device. The linkage slide plate can be set up so that the second motor and the lead screw drive the linkage slide plate to move the cylinder and the electromagnetic adsorption plate inside the long strip slide structure to increase the adsorption area. Attached Figure Description

[0036] The following figures are for illustrative purposes only and are not intended to limit the scope of the invention, wherein:

[0037] Figure 1 : Schematic diagram of the structure of the present invention;

[0038] Figure 2 : Schematic diagram of the broken part of the present invention;

[0039] Figure 3: Schematic diagram of the internal structure of the crusher shell of this invention;

[0040] Figure 4 : Schematic diagram of the buffer component structure;

[0041] Figure 5 Schematic diagram of the linkage mechanism;

[0042] Figure 6 Schematic diagram of the iron removal assembly structure;

[0043] In the diagram: 1. Crushing support; 2. Discharge hopper; 3. Feed channel; 4. Electromagnetic adsorption plate; 5. Cylinder; 6. Feed inlet; 7. Side plate; 8. Linkage mechanism; 9. Cover plate; 10. Rotating shaft; 11. First motor; 12. Dust removal equipment; 13. Belt; 14. Rotating roller; 15. Active cutter head; 16. Passive cutter head; 17. Telescopic rod; 18. Spring; 19. Fixing bolt; 20. Mounting back plate; 21. Stop block; 22. Base; 23. Support seat; 24. Support rod; 25. Base; 26. Connecting shaft; 27. Bearing; 28. Through hole; 29. ​​Linkage slide plate; 30. Iron removal frame; 31. Lead screw; 32. Second motor; 33. First conveyor belt; 34. Second conveyor belt. Detailed Implementation

[0044] To make the objectives, technical solutions, design methods, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and specific embodiments. It should be understood that the specific embodiments described herein are for illustrative purposes only and are not intended to limit the invention.

[0045] like Figure 1 As shown, the present invention provides a construction waste crushing device, including a crushing support 1, a feeding channel 3 at the top of the crushing support 1, a discharge bin 2 on one side of the crushing support 1, a crushing shell at the top of the discharge bin 2, a feeding port 6 on one side of the crushing shell, the feeding port 6 communicating with the feeding channel 3, a discharge port at the bottom of the crushing shell communicating with the discharge bin 2, and a dust removal device 12 at the discharge port.

[0046] The crushing housing consists of a base 25, side plates 7, and a cover plate 9. Two side plates 7 are provided, located on opposite sides of the base 25 and movably connected to it. The cover plate 9 is located on top of the side plates 7 and fixedly connected to them. A rotating roller 14 is installed inside the base 25, and is rotatably connected to the base 25 via a rotating shaft 10. One end of the rotating shaft 10 is equipped with a pulley. A first motor 11 is installed on the outside of the base 25, and the first motor 11 is connected to the pulley... The pulley is connected via a belt 13 for transmission; several active cutter heads 15 are evenly arranged on the outer surface of the rotating roller 14; a passive cutter head 16 is arranged at the bottom of the cover plate 9, and the top of the passive cutter head 16 is connected to the cover plate 9 through a buffer assembly. Several passive cutter heads 16 are arranged along the arc surface, and each passive cutter head 16 corresponds one-to-one with the active cutter head 15, so that during the rotation of the rotating roller 14, the active cutter head 15 receives the construction waste passing through the feed port 6 and crushes it by squeezing it with the passive cutter head 15. Due to the buffer assembly, the squeezing of the construction waste with the cutter head has a certain amount of play, turning rigid squeezing into flexible squeezing, which largely protects the cutter head.

[0047] like Figure 2 and Figure 5 As shown, the side plate 7 and the base 25 are connected by a linkage mechanism 8; a connecting shaft 26 is provided on the side of the base 25 away from the feed inlet 6, and both ends of the connecting shaft 26 extend to the outside of the base 25; bearings 27 are sleeved on both ends of the connecting shaft 26; the linkage mechanism 8 includes an arc-shaped connecting rod, one end of which is provided with a connecting plate, and the other end with a connecting sleeve; the connecting sleeve is sleeved on the bearing 27, and the connecting plate is fixedly connected to the side plate 7 by bolts. When construction waste exceeding a preset threshold size enters the feed inlet 6, under the action of the buffer assembly, the construction waste pushes up the cover plate 9 so that the linkage mechanism 8 rotates along the connecting sleeve. A mounting back plate 20 is provided on the top of the passive cutter head 16, and a slot is provided at the bottom of the mounting back plate 20. The passive cutter head 16 is engaged with the slot, and a connecting ear is provided on the top of the mounting back plate 20 for connecting the buffer assembly; in this embodiment, as Figure 3 and Figure 4As shown, the buffer assembly includes a telescopic rod 17, a base 22, and a stop block 21. A spring 18 is fitted onto the telescopic rod 17. The top of the telescopic rod 17 passes through the stop block 21 and is fixedly connected to the stop block 21. The bottom of the telescopic rod 17 is fixedly connected to the base 22. The base 22 and the connecting lug are rotatably connected by a pin. The top of the telescopic rod 17 extends to the outside of the cover plate 9 and is connected to the cover plate 9 by a fixing bolt 19. A support base 23 is also provided on the mounting back plate 20. Support rods 24 are provided on both sides of the support base 23. The top of the support rods 24 is fixedly connected to the bottom of the cover plate 9.

[0048] In the above, the dust removal equipment 12 includes a dust collector and a dust removal pipe, wherein the dust removal pipe connects the dust collector and the discharge port and is used to remove dust generated during the crushing process.

[0049] Because construction waste contains a large amount of iron scrap, it needs to be recycled before crushing. This embodiment uses the following method for preliminary collection of the iron scrap: [e.g., ...] Figure 6 As shown, an iron removal frame 30 is provided at the top of the feed channel 3. Several cylinders 5 are provided inside the iron removal frame 30. The output end of the cylinders 5 is connected to an electromagnetic adsorption disk 4. Several through holes 28 are opened on the upper surface of the feed channel 3. The position and number of the through holes 28 are adapted to the cylinders 5 so that the electromagnetic adsorption disk 4 extends along the through holes 28 into the feed channel 3 under the drive of the cylinders 5. The cylinder 5 is provided with a linkage slide plate 29 at its top, and the bottom of the linkage slide plate 29 is connected to several cylinders 5. The side of the linkage slide plate 29 is provided with at least two threaded holes, and a lead screw 31 is provided inside the threaded holes. One end of the lead screw 31 extends to the outside of the iron removal frame 30 and is axially connected to a second motor 32. The other end of the lead screw 31 is rotatably connected to the inner wall of the iron removal frame 30. The second motor 32 is fixedly installed on the outside of the iron removal frame 30. The through hole 28 is a long strip-shaped sliding groove structure. Under the drive of the second motor 32 and the lead screw 31, the linkage slide plate 29 drives the cylinders 5 and the electromagnetic adsorption disk 4 to slide inside the long strip-shaped sliding groove structure to increase the adsorption area. The feed channel 3 is equipped with a first conveyor belt 33. The feed end and the discharge end of the feed channel 3 are respectively connected to the two ends of the first conveyor belt 33, so that the construction waste entering the feed channel 3 can be sent to the feed inlet 6 via the first conveyor belt 33. Since the construction waste is mostly hard material, a wear-resistant layer is also provided on the outer ring of the first conveyor belt 33 to improve the product life.

[0050] After initial collection before crushing, continued collection of iron scrap is necessary after crushing to ensure the highest possible iron scrap collection rate. Specifically, for example... Figure 1As shown, a second conveyor belt 34 is provided at the bottom of the discharge hopper 2, extending to the outside of the crushing support 1; an iron removal frame 30 is provided at one end of the second conveyor belt 34 near the crushing support 1, and the iron removal frame 30 is fixedly connected to the crushing support 1; a plurality of cylinders 5 are provided inside the iron removal frame 30, and the output end of the cylinders 5 is connected to an electromagnetic adsorption disk 4; a linkage slide plate 29 is provided on the top of the cylinders 5, and the bottom of the linkage slide plate 29 is connected to a plurality of cylinders 5; at least two threaded holes are provided on the side of the linkage slide plate 29, and a lead screw 31 is provided inside the threaded holes. One end of the lead screw 31 extends to the outside of the iron removal frame 30 and is axially connected to a second motor 32, and the other end of the lead screw 31 is rotatably connected to the inner wall of the iron removal frame 30; the second motor 32 is fixedly provided on the outside of the iron removal frame 30; the linkage slide plate 29, driven by the second motor 32 and the lead screw 31, drives the cylinders 5 and the electromagnetic adsorption disk 4 to slide on the top of the second conveyor belt 34 to increase the adsorption area.

[0051] Based on the above-mentioned construction waste crushing device, this embodiment also provides a construction waste crushing method, including: starting the power supply for controlling cylinder 5, first motor 11, second motor 32, first conveyor belt 33, second conveyor belt 34 and electromagnetic adsorption disk 4, and putting the construction waste to be crushed into the feeding channel 3;

[0052] The cylinder 5 drives the electromagnetic adsorption disk 4 to move downward to the set position to adsorb the iron waste in the first conveyor belt 33. During this process, the linkage slide plate 29 drives the cylinder 5 and the electromagnetic adsorption disk 4 to slide inside the long strip slide structure under the drive of the second motor 32 and the lead screw 31 to increase the adsorption area.

[0053] Construction waste enters the feed inlet 6 under the action of the first conveyor belt 33. The first motor 11 drives the rotating roller 14 to rotate. The active cutter head 15 and the passive cutter head 16 squeeze and crush the construction waste. During this process, the construction waste squeezes the passive cutter head 16, so that the mounting back plate 20 squeezes the telescopic rod 17 and compresses the spring 18. When the spring 18 is compressed to its shortest length, the cover plate 9 is lifted up, so that the linkage mechanism 8 rotates along the connecting sleeve, which plays a protective role.

[0054] The crushed construction waste falls into the discharge bin 2 and is transported to the designated location via the second conveyor belt 34 at the bottom of the discharge bin 2. During this process, the linkage slide plate 29, driven by the second motor 32 and the lead screw 31, drives the cylinder 5 and the electromagnetic adsorption plate 4 to slide on the top of the second conveyor belt 34 to increase the adsorption area.

[0055] After the construction waste is crushed, the electromagnetic adsorption plate 4 is de-energized. The iron waste adsorbed by the electromagnetic adsorption plate 4 falls onto the first conveyor belt 33 and the second conveyor belt 34. The first conveyor belt 33 rotates in the opposite direction, and the second conveyor belt 34 rotates in the forward direction to complete the collection of iron waste.

[0056] The various embodiments of the present invention have been described above. These descriptions are exemplary and not exhaustive, nor are they limited to the disclosed embodiments. Many modifications and variations will be apparent to those skilled in the art without departing from the scope and spirit of the described embodiments. The terminology used herein is chosen to best explain the principles, practical application, or technical improvements to the embodiments in the market, or to enable others skilled in the art to understand the embodiments disclosed herein.

Claims

1. A construction waste crushing device, characterized in that, The device includes a crushing support (1), with a feeding channel (3) at the top; a discharge chamber (2) is provided on one side of the crushing support (1), with a crushing shell at the top of the discharge chamber (2), a feeding port (6) on one side of the crushing shell, the feeding port (6) being connected to the feeding channel (3), a discharge port is provided at the bottom of the crushing shell, the discharge port being connected to the discharge chamber (2), and a dust removal device (12) is also provided at the discharge port. The crushing shell is composed of a base (25), side plates (7) and a cover plate (9). There are two side plates (7), which are located on both sides of the base (25) and are movably connected to the base (25). The cover plate (9) is located on the top of the side plates (7) and is fixedly connected to the side plates (7). The base (25) is equipped with a rotating roller (14), which is rotatably connected to the base (25) via a rotating shaft (10). One end of the rotating shaft (10) is equipped with a pulley, and a first motor (11) is provided on the outside of the base (25). The first motor (11) is connected to the pulley via a belt (13). The outer surface of the rotating roller (14) is uniformly provided with a plurality of active cutter heads (15). The bottom of the cover plate (9) is provided with a passive cutter head (16), the top of the passive cutter head (16) is connected to the cover plate (9) through a buffer assembly, and a number of passive cutter heads (16) are provided along the arc surface, and the passive cutter head (16) corresponds one-to-one with the active cutter head (15); The side plate (7) and the base (25) are connected by a linkage mechanism (8); A connecting shaft (26) is provided on the side of the base (25) away from the feed inlet (6), and both ends of the connecting shaft (26) extend to the outside of the base (25); bearings (27) are sleeved on both ends of the connecting shaft (26). The linkage mechanism (8) includes an arc-shaped connecting rod. One end of the arc-shaped connecting rod is provided with a connecting plate, and the other end is provided with a connecting sleeve. The connecting sleeve is sleeved on the bearing (27). The connecting plate is fixedly connected to the side plate (7) by bolts. When construction waste exceeding the preset threshold size enters the feed inlet (6), under the action of the buffer component, the construction waste pushes up the cover plate (9) so that the linkage mechanism (8) rotates along the connecting sleeve. The passive cutter head (16) is provided with a mounting back plate (20) at the top, and a slot is provided at the bottom of the mounting back plate (20). The passive cutter head (16) is engaged with the slot. The mounting back plate (20) is provided with a connecting ear at the top for connecting a buffer assembly. The buffer assembly includes a telescopic rod (17), a base (22), and a stop (21); a spring (18) is sleeved on the telescopic rod (17), the top of the telescopic rod (17) passes through the stop (21) and is fixedly connected to the stop (21), the bottom of the telescopic rod (17) is fixedly connected to the base (22), and the base (22) is rotatably connected to the connecting ear by a pin. The top of the telescopic rod (17) extends to the outside of the cover plate (9) and is connected to the cover plate (9) by fixing bolts (19).

2. The construction waste crushing device according to claim 1, characterized in that, The mounting back plate (20) is also provided with a support base (23), and support rods (24) are provided on both sides of the support base (23). The top of the support rods (24) is fixedly connected to the bottom of the cover plate (9).

3. The construction waste crushing device according to claim 1, characterized in that, The dust removal equipment (12) includes a dust collector and a dust removal pipe, wherein the dust removal pipe is connected to the dust collector and the discharge port.

4. The construction waste crushing device according to claim 1, characterized in that, The top of the feed channel (3) is provided with an iron removal frame (30), and the iron removal frame (30) is provided with several cylinders (5). The output end of the cylinders (5) is connected to an electromagnetic adsorption disk (4). The upper surface of the feeding channel (3) is provided with a number of through holes (28). The position and number of the through holes (28) are adapted to the cylinder (5) so that the electromagnetic adsorption disk (4) extends along the through holes (28) into the inside of the feeding channel (3) under the drive of the cylinder (5).

5. A construction waste crushing device according to claim 4, characterized in that, The cylinder (5) is provided with a linkage slide plate (29) at the top, and the bottom of the linkage slide plate (29) is connected to several cylinders (5); The side of the linkage slide plate (29) is provided with at least two threaded holes, and a lead screw (31) is provided inside the threaded holes. One end of the lead screw (31) extends to the outside of the iron removal frame (30) and is axially connected to a second motor (32). The other end of the lead screw (31) is rotatably connected to the inner wall of the iron removal frame (30). The second motor (32) is fixedly installed on the outside of the iron removal frame (30). The through hole (28) is a long strip-shaped sliding groove structure. The linkage slide plate (29) drives the cylinder (5) and the electromagnetic adsorption disk (4) to slide inside the long strip-shaped sliding groove structure under the drive of the second motor (32) and the lead screw (31) to increase the adsorption area.

6. A construction waste crushing device according to claim 5, characterized in that, The feed channel (3) is equipped with a first conveyor belt (33), and the feed end and the discharge end of the feed channel (3) are respectively connected to the two ends of the first conveyor belt (33); The outer ring of the first conveyor belt (33) is provided with a wear-resistant layer.

7. A construction waste crushing device according to claim 6, characterized in that, The bottom of the discharge hopper (2) is provided with a second conveyor belt (34), which extends to the outside of the crushing support (1); The second conveyor belt (34) is provided with an iron removal frame (30) at one end near the crushing support (1), and the iron removal frame (30) is fixedly connected to the crushing support (1); The iron removal frame (30) is equipped with several cylinders (5), and the output end of the cylinder (5) is connected to an electromagnetic adsorption disk (4); the top of the cylinder (5) is equipped with a linkage slide plate (29), and the bottom of the linkage slide plate (29) is connected to several cylinders (5). The side of the linkage slide plate (29) is provided with at least two threaded holes, and a lead screw (31) is provided inside the threaded holes. One end of the lead screw (31) extends to the outside of the iron removal frame (30) and is axially connected to a second motor (32). The other end of the lead screw (31) is rotatably connected to the inner wall of the iron removal frame (30). The second motor (32) is fixedly installed on the outside of the iron removal frame (30). The linkage slide plate (29) drives the cylinder (5) and the electromagnetic adsorption disk (4) to slide on the top of the second conveyor belt (34) to increase the adsorption area under the drive of the second motor (32) and the lead screw (31).

8. A method for crushing construction waste, characterized in that, The construction waste crushing device according to claim 7 comprises: Start the power supply for controlling the cylinder (5), the first motor (11), the second motor (32), the first conveyor belt (33), the second conveyor belt (34) and the electromagnetic adsorption plate (4), and put the construction waste to be crushed into the feeding channel (3); The cylinder (5) drives the electromagnetic adsorption disk (4) to move downward to the set position to adsorb the iron waste in the first conveyor belt (33). During this process, the linkage slide (29) drives the cylinder (5) and the electromagnetic adsorption disk (4) to slide inside the through hole (28) under the drive of the second motor (32) and the lead screw (31) to increase the adsorption area. Construction waste enters the feed inlet (6) under the action of the first conveyor belt (33). The first motor (11) drives the rotating roller (14) to rotate. The active cutter head (15) and the passive cutter head (16) squeeze and crush the construction waste. During this process, the construction waste squeezes the passive cutter head (16) so that the mounting back plate (20) squeezes the telescopic rod (17) and then compresses the spring (18). When the spring (18) is compressed to its shortest length, the cover plate (9) is lifted so that the linkage mechanism (8) rotates along the connecting sleeve to play a protective role. The crushed construction waste falls into the discharge bin (2) and is sent to the designated location via the second conveyor belt (34) set at the bottom of the discharge bin (2). During this process, the linkage slide plate (29) drives the cylinder (5) and the electromagnetic adsorption plate (4) to slide on the top of the second conveyor belt (34) to increase the adsorption area under the drive of the second motor (32) and the lead screw (31). After the construction waste is crushed, the electromagnetic adsorption plate (4) is de-energized. The iron waste adsorbed by the electromagnetic adsorption plate (4) falls onto the first conveyor belt (33) and the second conveyor belt (34). The first conveyor belt (33) is rotated in the opposite direction and the second conveyor belt (34) is rotated in the forward direction to complete the collection of iron waste.

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