CN114950684A

CN114950684A - Mechanized crushing structure of low-rise building and use method thereof

Info

Publication number: CN114950684A
Application number: CN202210585114.1A
Authority: CN
Inventors: 红梅; 汪力; 袁爱玲; 欧高翔; 何强; 王洪
Original assignee: Chengdu Pengcheng Boli Construction Machinery Leasing Co ltd
Current assignee: Chengdu Pengcheng Boli Construction Machinery Leasing Co ltd
Priority date: 2022-05-27
Filing date: 2022-05-27
Publication date: 2022-08-30

Abstract

The utility model belongs to the technical field of the construction and specifically relates to a mechanized crushing structure of low-rise building is related to, which comprises a bod, the feed inlet has been seted up to organism top position department, the inside hollow broken chamber that is of organism, be provided with two sets of being parallel to each other in the organism, a crushing roller for rubbing building rubbish, the below of crushing roller is provided with smart garrulous board, but be provided with horizontal reciprocating motion's movable plate between smart garrulous board and the crushing roller, smart garrulous board and the mutual just right side of movable plate all fix and be provided with a plurality of broken teeth, the filtration pore size of movable plate is greater than the filtration pore size of smart garrulous board, the reinforcing bar discharge port has been seted up to one side of organism in smart garrulous board top, the disintegrating slag discharge port has been seted up to one side position of organism below the movable plate, reinforcing bar in the building rubbish is retrieved on the spot, the advantage of improvement recovery efficiency.

Description

Mechanized crushing structure of low-rise building and use method thereof

Technical Field

The application relates to the field of building construction, in particular to a mechanized crushing structure of a low-rise building and a using method thereof.

Background

With the increasing population of cities, the land resources of the cities are less and less, and a plurality of old cells need to be dismantled to build new cells so as to meet the demand of population growth. The low-rise buildings with less than 10 floors in these buildings are very high in percentage.

For low-rise buildings, the demolition mode is mainly mechanical crushing demolition, and the mechanical crushing demolition has the advantages of high efficiency, small environmental pollution and low influence on the life of surrounding residents. After the low-rise building is dismantled, the reinforcing bar inside can carry out recovery processing, and present recovery mode is mostly for directly breaking back construction waste and carry out the transportation processing.

However, the construction waste after being broken and removed usually has a large amount of concrete blocks, a large amount of manpower and material resources are needed to be spent during transportation, and the concrete blocks are usually broken by manpower after transportation, so that the recovery efficiency is low.

Disclosure of Invention

The application provides a mechanized crushing structure of a low-rise building and a using method thereof in order to realize on-site recycling and recovery efficiency improvement of reinforcing steel bars in building rubbish.

In one aspect, the present application provides a mechanized breaking structure of a low-rise building:

the utility model provides a mechanized broken structure of low-rise building, which comprises a bod, organism top position department has seted up the feed inlet, the inside hollow broken chamber that is of organism, be provided with two sets of being parallel to each other in the organism, be used for rubbing the crushing roller of building rubbish, the below of crushing roller is provided with smart garrulous board, but be provided with horizontal reciprocating motion's movable plate between smart garrulous board and the crushing roller, smart garrulous board and the mutual just right side of movable plate all fixed be provided with a plurality of broken teeth, the filtration pore size of movable plate is greater than the filtration pore size of smart garrulous board, the reinforcing bar discharge port has been seted up to one side of organism in smart garrulous board top, the disintegrating slag discharge port has been seted up to one side position of organism below movable plate.

Through adopting above-mentioned scheme, construction waste gets into broken intracavity portion through the feed inlet, at first carry out crushing treatment through the crushing roller, concrete is extruded into the fragment in the crushing process, the reinforcing bar is extruded into the group and then continues to drop, movable plate reciprocating motion is sent to the reinforcing bar discharge port with the reinforcing bar immediately, the fragment that drops downwards from movable plate continues to be further extruded by broken tooth and breaks, final disintegrating slag is discharged from the disintegrating slag discharge port, therefore, construction waste can carry out comprehensive crushing treatment through broken structure, make the concrete piece that has above the reinforcing bar of recovery as few as possible, and construction waste is broken as far as possible, be convenient for subsequent transportation and processing, the recovery efficiency of the reinforcing bar in the construction waste has been improved greatly.

Optionally, a feeding conveyor belt is arranged at the position of the feeding hole, the feeding conveyor belt extends obliquely upwards to the feeding hole and then horizontally extends into the machine body, and the end of the feeding conveyor belt extends to a position between the two sets of crushing rollers.

Optionally, a material pressing cylinder is fixedly arranged at the top of the machine body, the bottom of a piston rod of the material pressing cylinder is inserted into the machine body and is fixedly provided with a material pressing block, the size of the cross section of the material pressing block is gradually reduced from top to bottom, and the bottom of the material pressing block is located at the middle position of the central connecting line of the two crushing rollers.

Optionally, the top of the machine body is provided with a detection strip in a sliding mode, the sliding direction of the detection strip is consistent with the horizontal conveying direction of the feeding conveying belt, the bottom end of the detection strip extends into the machine body, the detection strip is connected with the machine body through a spring, a distance sensor is arranged between the detection strip and the material pressing cylinder, the output end of the distance sensor is connected with a controller, and the controller responds to a distance signal of the distance sensor to control the material pressing cylinder to start to press the material when the distance between the detection strip and the material pressing cylinder is lower than a preset value.

Optionally, the fixed mounting bar that is provided with in organism top, the mounting bar is located the one side that the test strip deviates from the material cylinder of pressing, is provided with reset spring between mounting bar and the test strip, and reset spring's both ends are fixed with test strip and mounting bar respectively.

Optionally, two opposite sides of the machine body are provided with sliding holes, two ends of the movable plate penetrate through the sliding holes and are in sliding fit with the sliding holes, and one side of the machine body is provided with a reciprocating driving piece for driving the movable plate to reciprocate.

Optionally, a cleaning rod is arranged above the movable plate, a rotating shaft is fixedly arranged at the center of the cleaning rod, the rotating shaft vertically penetrates through the movable plate, the fine crushing plate and the machine body downwards and then is connected with a rotary driving piece, and a yielding hole which is larger than the rotating shaft in size and ensures the movable plate to smoothly reciprocate is formed in the surface of the movable plate.

Optionally, the rotary driving part includes a rotary driving gear, a rotary driven gear and a rotary motor, an output shaft of the rotary motor is fixed to the rotary driving gear, the rotary driving gear is engaged with the rotary driven gear, and the rotary driven gear is fixedly connected to the rotary shaft; the rotating shaft is hollow, the bottom of the rotating shaft is communicated with an air inlet pipe, and the air inlet pipe and the rotating shaft are fixed in a rotating connection mode; the bottom end of the air inlet pipe is communicated with the piston type air pump, and the sweeping rod is of a hollow retractable structure capable of being repeatedly inflated and deflated.

In another aspect, the present application provides a method for using a mechanized breaking structure of a low-rise building, comprising the steps of:

a. placing the crushed and dismantled construction waste into a feeding conveyor belt, and feeding the construction waste into the machine body through the feeding conveyor belt;

b. starting a crushing roller to perform primary crushing on the construction waste;

c. starting the reciprocating driving piece and the rotary driving piece, further cleaning the building waste which falls onto the surface of the movable plate and is subjected to primary crushing, further crushing part of waste residues which fall onto the fine crushing plate, discharging recycled steel bars through a steel bar discharge port, and discharging crushed waste residues from the waste residue discharge port;

d. start piston air pump simultaneously, regularly inflate, gassing to continuously lift up or put down the waste material that drops to the movable plate through the cleaning rod, avoid the waste material card in the strain hole of movable plate, ensure reinforcing bar recovery efficiency.

In summary, the present application has the following technical effects:

1. the construction waste is crushed for multiple times, so that the recovery efficiency of the reinforcing steel bar is improved, and the transportation and treatment of the construction waste residues are more convenient;

2. the detection strip and the distance sensor are arranged at the top of the machine body, so that when the feeding of the construction waste is not smooth, the detection strip can be pushed to move, a distance signal is transmitted to the controller, and the controller can control the pressing cylinder to start, so that the feeding smoothness is ensured;

3. through set up the cleaning rod above the movable plate to set up the cleaning rod to the contractile structure of repeatedly inflating gassing, thereby make construction waste and treat that to retrieve the reinforcing bar and can not block at the cardboard surface, ensure that the organism is inside can not take place excessively to block up.

Drawings

FIG. 1 is a schematic overall sectional structure in an embodiment of the present application;

FIG. 2 is a top view of the housing in an embodiment of the present application;

fig. 3 is a sectional view of the sweeping bar.

In the figure, 1, a machine body; 11. a feed inlet; 12. a steel bar discharge port; 13. a crushed slag discharge port; 14. a crushing chamber; 15. resetting the sliding hole; 2. a feeding conveyor belt; 3. a crushing roller; 31. a crushing drive motor; 32. crushing the driving gear; 33. crushing the driven gear; 4. finely crushing the plate; 41. crushing teeth; 5. a movable plate; 51. a limiting block; 52. a hole of abdication; 6. a reciprocating drive member; 61. a reciprocating motor; 62. a turntable; 63. a connecting rod; 7. a material pressing cylinder; 71. pressing blocks; 8. mounting a bar; 81. a return spring; 82. a test strip; 9. a distance sensor; 91. an infrared emitter; 92. an infrared receiver; 10. a cleaning rod; 101. a rotating shaft; 102. a rotary drive member; 1021. rotating the drive gear; 1022. rotating the driven gear; 1023. a rotating electric machine; 103. an air inlet pipe; 104. a piston type air pump.

Detailed Description

The present application is described in further detail below with reference to the attached drawings.

Referring to fig. 1, the application provides a mechanized broken structure of low-rise building, including organism 1, feed inlet 11 has been seted up to one side position department at organism 1 top, and feed inlet 11 department is provided with material loading conveyer belt 2, and inside material loading conveyer belt 2 slopes to set up and the top level penetrates feed inlet 11, construction waste passed through material loading conveyer belt 2 and is carried into organism 1 inside and carry out broken handle.

The inside broken chamber 14 that is hollow of organism 1, the position department of being close to the top in the broken chamber 14 is provided with two sets of crushing rollers 3 that are parallel to each other, and the both ends of crushing roller 3 form with the organism 1 inner wall to rotate to be connected, and the horizontal direction of transfer of the axis of rotation perpendicular to material loading conveyer belt 2 of crushing roller 3. To further ensure the crushing effect, the ends of the feeding conveyor belt 2 extend between two sets of crushing rollers 3.

With reference to fig. 1 and 2, the outer side wall of the machine body 1 is provided with a crushing driving member for driving the crushing rollers 3 to rotate, specifically, the crushing driving member comprises a crushing driving motor 31, a crushing driving gear 32 and a crushing driven gear 33, wherein the crushing driving gear 32 and the crushing driven gear 33 are respectively fixed to the end of one of the crushing rollers 3, the crushing driving gear 32 and the crushing driven gear 33 are meshed with each other, the output shaft of the crushing driving motor 31 is fixed to the crushing driving gear 32, so as to drive the two crushing rollers 3 to rotate oppositely, and realize the crushing treatment of the construction waste.

The movable plate 5 and the fine crushing plate 4 are sequentially arranged below the crushing roller 3, the movable plate 5 and the fine crushing plate 4 are parallel to each other, and a plurality of crushing teeth 41 are fixedly arranged on one side surface of the movable plate 5, which is opposite to the fine crushing plate 4. The surfaces of the movable plate 5 and the fine crushing plate 4 are provided with a plurality of filtering holes, the size of the filtering holes of the movable plate 5 is larger than that of the fine crushing plate 4, and particularly, the size of the filtering holes of the movable plate 5 is preferably 1.5-2 times that of the filtering holes of the fine crushing plate 4.

The crushing teeth 41 on the surface of the movable plate 5 and the crushing teeth 41 on the surface of the fine crushing plate 4 are arranged in a staggered mode, the tooth ends of the crushing teeth 41 are spaced by 2-4cm, and the whole crushing teeth 41 are arranged in a sharp-pointed mode, so that the construction waste between the movable plate 5 and the fine crushing plate 4 is further finely crushed.

The both ends of smart broken plate 4 and organism 1 inner wall fixed connection, the both ends of movable plate 5 are worn out organism 1 respectively and are formed horizontal sliding fit with organism 1, and the one end of movable plate 5 is worn out organism 1 back fixedly connected with stopper 51 to the sliding distance of restriction movable plate 5. One end of the movable plate 5, which is far away from the limit block 51, is provided with a reciprocating driving member 6 which drives the movable plate 5 to reciprocate.

The reciprocating driving member 6 includes a reciprocating motor 61, a rotary plate 62 and a connecting rod 63, the reciprocating motor 61 is fixed on the side wall of the machine body 1, the output shaft of the reciprocating motor 61 is horizontally arranged, the rotary plate 62 is fixed with the output shaft of the reciprocating motor 61, a hinge point is arranged at a non-central position of the rotary plate 62, one end of the connecting rod 63 is hinged with the rotary plate 62 through the hinge point, and the other end is hinged with the end of the movable plate 5, so that the reciprocating motor 61, the rotary plate 62, the connecting rod 63 and the movable plate 5 can form a set of crank-slider mechanisms, thereby enabling the movable plate 5 to reciprocate.

A reinforcing bar discharge port 12 is opened at one side of the machine body 1, and the reinforcing bar discharge port 12 is positioned on the upper surface of the movable plate 5. Meanwhile, a slag discharge port 13 is formed at the bottom of the machine body 1, and the slag discharge port 13 is located below the fine crushing plate 4. Building waste material carries out preliminary breakage back through crushing roller 3, drops to movable plate 5 surface, and the reinforcing bar is difficult to by direct breakage, consequently can be buckled or fold behind crushing roller 3 to drive under movable plate 5's reciprocating motion and discharge to reinforcing bar discharge port 12, some fragments then can drop to and are further broken between refined crushing board 4 and the movable plate 5 by broken tooth 41 and handle. At this time, the movement of the movable plate 5 is sufficient for conveying and discharging the reinforcing bars, and the small lump of the scrap between the refining plate 4 and the movable plate 5 is further crushed and processed, and the crushed slag is discharged from the slag discharge port 13.

The top position department of organism 1 is fixed to be provided with presses material cylinder 7, presses inside the piston rod of material cylinder 7 vertically inserts organism 1 downwards, and the fixed material piece 71 that is provided with in bottom of piston rod, presses material piece 71 to be from last to down the back taper structure that the cross-sectional dimension reduces gradually, and presses the bottom of material piece 71 to be located between two sets of crushing rollers 3.

Fixed mounting bar 8 that is provided with of top position department of organism 1, mounting bar 8 is located 2 horizontal segments of material loading conveyer belt directly over, be provided with detection strip 82 between mounting bar 8 and the pressure material cylinder 7, organism 1 surface position department at detection strip 82 place has seted up the gliding sliding hole 15 that resets that supplies detection strip 82 horizontal slip, the slip direction of detection strip 82 in the sliding hole 15 that resets is unanimous with the direction of transfer of 2 horizontal segments of material loading conveyer belt, and form through reset spring 81 between detection strip 82 and the mounting bar 8 and be connected, be provided with distance sensor 9 between detection strip 82 and the pressure material cylinder 7, when being less than the default with the distance between detection strip 82 and the pressure material cylinder 7, the controller can control and press material cylinder 7 to start, thereby push down the processing to the construction waste in the organism 1, ensure construction waste's broken smoothness nature. Specifically, the distance sensor 9 includes an infrared emitter 91 fixed to a surface of the detection bar 82 on a side facing the material cylinder 7, and an infrared receiver 92 installed at a position facing the material cylinder 7. When getting into the too much or the whole size of the construction waste in organism 1 great, then construction waste can touch the measuring strip 82 and promote the measuring strip 82 and be close to press material cylinder 7, and distance sensor 9 gives the controller with distance signal transmission, and the controller responds to distance signal and controls and presses material cylinder 7 to start, presses material cylinder 7 to drive and presses material piece 71 to push down construction waste to the center of two crushing rolls 3, and is broken with higher speed, improves crushing efficiency.

Referring to fig. 1 and 3, in order to reduce the clogging of the crushed construction waste in the machine body 1, a cleaning rod 10 for rotating and cleaning the surface of the movable plate 5 at regular time is provided on the upper surface of the movable plate 5, a rotation shaft 101 is fixedly provided at the center position of the cleaning rod 10, and the rotation shaft 101 is connected to a rotary driving member 102 after passing through the movable plate 5, the refining plate 4, and the bottom of the machine body 1 in this order from top to bottom. Since the movable plate 5 needs to be horizontally reciprocated, a relief hole 52 is provided at a position where the rotation shaft 101 passes through the movable plate 5, and the length of the relief hole 52 is greater than the horizontal movement distance of the movable plate 5 to ensure that the movement of the movable plate 5 is not interfered.

The rotary driving member 102 includes a rotary driving gear 1021, a rotary driven gear 1022 and a rotary motor 1023, the rotary driven gear 1022 is fixed to the rotary shaft 101, the rotary driving gear 1021 is engaged with the rotary driven gear 1022, the rotary driving gear 1021 and the rotary driven gear 1022 are both in rotary connection with the surface of the machine body 1, and an output shaft of the rotary motor 1023 is fixed to the rotary driving gear 1021. The sweeping rod 10 is driven to rotate by the rotary driving member 102 at regular time, so that the reinforcing steel bars to be recovered and large-particle impurities on the surface of the movable plate 5 can be smoothly discharged from the reinforcing steel bar discharge port 12.

Further, with reference to fig. 1 and 3, in order to avoid the difficulty in blanking caused by the insertion of the end of the reinforcing steel bar into the filtering hole of the movable plate 5, in this embodiment, the cleaning rod 10 is configured to be hollow inside, and a structure capable of contracting and expanding through inflation and deflation is specifically made of rubber, the hollow inside of the rotating shaft 101 is communicated with the inside of the cleaning rod 10, the bottom end of the rotating shaft 101 is communicated with an air inlet pipe 103 through a rotation connection manner, and the end of the air inlet pipe 103 away from the rotating shaft 101 can be communicated with the piston type air pump 104, so that the intermittent inflation and deflation can be performed through the piston type air pump 104, thereby achieving the contraction and expansion of the cleaning rod 10, so as to lift up the reinforcing steel bar falling on the surface of the movable plate 5, and cooperate with the rotation motion of the cleaning rod 10, thereby achieving the smooth discharge of the construction waste.

In another aspect, the present embodiment provides a method for using a mechanized breaking structure for low-rise buildings, including the following steps:

a. placing the crushed and dismantled construction waste into a feeding conveyor belt 2, and feeding the construction waste into a machine body 1 through the feeding conveyor belt 2;

b. starting the crushing roller 3 to perform primary crushing on the construction waste;

c. starting the reciprocating driving piece 6 and the rotary driving piece 102, further cleaning the building waste which falls onto the surface of the movable plate 5 and is subjected to primary crushing, further crushing part of waste slag which falls onto the fine crushing plate 4, discharging recycled steel bars through a steel bar discharge port 12, and discharging the crushed waste slag from the waste slag discharge port;

d. meanwhile, the piston type air pump 104 is started to periodically inflate and deflate, so that waste materials falling onto the movable plate 5 are continuously lifted or put down through the sweeping rod 10, the waste materials are prevented from being clamped in filter holes of the movable plate 5, and the recovery efficiency of the reinforcing steel bars is ensured.

The present embodiment is only for explaining the present application, and it is not limited to the present application, and those skilled in the art can make modifications of the present embodiment without inventive contribution as needed after reading the present specification, but all of them are protected by patent law within the scope of the claims of the present application.

Claims

1. A mechanized crushing structure of low-rise buildings is characterized in that: the garbage crusher comprises a crusher body (1), a feeding hole (11) is formed in the top of the crusher body (1), a hollow crushing cavity (14) is formed in the crusher body (1), two groups of crushing rollers (3) which are parallel to each other and used for crushing building garbage are arranged in the crusher body (1), a fine crushing plate (4) is arranged below the crushing rollers (3), a movable plate (5) capable of horizontally reciprocating is arranged between the fine crushing plate (4) and the crushing rollers (3), a plurality of crushing teeth (41) are fixedly arranged on the side faces, opposite to each other, of the fine crushing plate (4) and the movable plate (5), the size of a filter hole of the movable plate (5) is larger than that of the fine crushing plate (4), a reinforcing steel bar discharging hole (12) is formed in one side, above the fine crushing plate (4), and a crushed slag discharging hole (13) is formed in one side position, below the movable plate (5), of the crusher body (1).

2. The mechanized breaking structure of low-rise buildings according to claim 1, wherein: feed inlet (11) position department is provided with material loading conveyer belt (2), and material loading conveyer belt (2) slope upwards extends to feed inlet (11) back level and stretches into in organism (1), and the tip of material loading conveyer belt (2) extends to the position between two sets of crushing rollers (3).

3. The mechanized breaking structure of a low-rise building of claim 2, wherein: the top position of the machine body (1) is fixedly provided with a material pressing cylinder (7), the bottom of a piston rod of the material pressing cylinder (7) is inserted into the machine body (1) and is fixedly provided with a material pressing block (71), the cross section size of the material pressing block (71) is gradually reduced from top to bottom, and the bottom of the material pressing block (71) is positioned in the middle position of the central connecting line of the two groups of crushing rollers (3).

4. The mechanized breaking structure of low-rise buildings according to claim 3, wherein: organism (1) top position department slides and is provided with detection strip (82), the horizontal direction of transfer of detection strip (82) slip direction and material loading conveyer belt (2) is unanimous, the bottom of detection strip (82) stretches into inside organism (1), detection strip (82) pass through spring coupling with organism (1), be provided with distance sensor (9) between detection strip (82) and swage cylinder (7), the output connection director of distance sensor (9), the controller responds to the distance signal of distance sensor (9) and starts to press swage cylinder (7) to handle with distance when being less than the default between detection strip (82) and swage cylinder (7).

5. The mechanized breaking structure of low-rise buildings according to claim 4, wherein: organism (1) top is fixed to be provided with mounting bar (8), and mounting bar (8) are located one side that detecting strip (82) deviate from material cylinder (7) of pressing, are provided with reset spring (81) between mounting bar (8) and detecting strip (82), and the both ends of reset spring (81) are fixed with detecting strip (82) and mounting bar (8) respectively.

6. The mechanized breaking structure of low-rise buildings according to claim 5, wherein: the two opposite sides of the machine body (1) are provided with sliding holes, the two ends of the movable plate (5) penetrate through the sliding holes and are in sliding fit with the sliding holes, and one side of the machine body (1) is provided with a reciprocating driving piece (6) for driving the movable plate (5) to reciprocate.

7. The method of claim 1, wherein the step of mechanically crushing the low-rise building comprises the steps of: the cleaning device is characterized in that a cleaning rod (10) is arranged above the movable plate (5), a rotating shaft (101) is fixedly arranged at the center of the cleaning rod (10), the rotating shaft (101) vertically penetrates through the movable plate (5), the refining plate (4) and the machine body (1) downwards and then is connected with a rotary driving piece (102), and a yielding hole (52) which is larger than the rotating shaft (101) in size and ensures the movable plate (5) to smoothly reciprocate is formed in the surface of the movable plate (5).

8. A mechanized demolition structure for low-rise buildings according to claim 7, wherein: the rotary driving piece (102) comprises a rotary driving gear (1021), a rotary driven gear (1022) and a rotary motor (1023), an output shaft of the rotary motor (1023) is fixed with the rotary driving gear (1021), the rotary driving gear (1021) is meshed with the rotary driven gear (1022), and the rotary driven gear (1022) is fixedly connected with the rotary shaft (101); the rotating shaft (101) is hollow, the bottom of the rotating shaft (101) is communicated with an air inlet pipe (103), and the air inlet pipe (103) and the rotating shaft (101) are fixed in a rotating connection mode; the bottom end of the air inlet pipe (103) is communicated with a piston type air pump (104), and the sweeping rod (10) is a retractable structure which is hollow inside and can be inflated and deflated repeatedly.

9. The mechanized breaking structure of a low-rise building of claim 8, wherein: the using method comprises the following steps:

a. placing the crushed and dismantled construction waste into a feeding conveyor belt (2), and feeding the construction waste into a machine body (1) through the feeding conveyor belt (2);

b. starting a crushing roller (3) to perform primary crushing on the construction waste;

c. starting a reciprocating driving piece (6) and a rotary driving piece (102), further cleaning the construction waste which falls onto the surface of the movable plate (5) and is subjected to primary crushing, further crushing part of waste slag which falls onto the fine crushing plate (4), discharging recycled steel bars through a steel bar discharge port (12), and discharging the crushed waste slag from the waste slag discharge port;

d. and meanwhile, the piston type air pump (104) is started to regularly inflate and deflate so as to continuously lift up or put down the waste materials falling onto the movable plate (5) through the sweeping rod (10), so that the waste materials are prevented from being clamped in the filtering holes of the movable plate (5), and the recovery efficiency of the reinforcing steel bars is ensured.