Construction waste crushing device

Abstract

The utility model belongs to the technical field of construction waste treatment, and particularly relates to a construction waste crushing device which comprises a crushing box, a crushing mechanism used for crushing construction waste is arranged in the crushing box, a dust removal cabin communicated with an inner cavity of the crushing box is fixedly installed at the top of the crushing box, and a feeding port is formed in the end, away from the crushing box, of the dust removal cabin. And the dust removal cabin is provided with a dust removal mechanism used for preventing crushed flying dust from flying outwards, a screening mechanism used for screening the construction waste is arranged below the crushing box, and the crushing mechanism is located between the dust removal mechanism and the screening mechanism. According to the construction waste crushing device, a sliding rod is pushed to move in a sliding groove through extension of the end part of a piston shaft of an electric push rod, so that large construction waste fragments screened by a screen plate which is obliquely arranged can move towards one side of a discharging groove, and the crushed construction waste can be automatically screened according to the size; and therefore, manual screening is not needed.

Description

TECHNICAL FIELD

[0001] The utility model relates to building garbage processing technical field especially relates to a building garbage rubbing crusher. BACKGROUND

[0002] Building garbage refers to the waste generated in building activities, and the building garbage is various, including concrete, bricks, wood, metal, plastic and various materials, and the building garbage contains a large amount of recyclable materials such as concrete, bricks and metal.

[0003] At present, the building garbage is mostly crushed into small size by the rubbing crusher for recycling, and the existing building garbage rubbing crusher gradually finds the following defects in the use process:

[0004] 1) the existing building garbage rubbing crusher is hit by the high-speed rotating hammer head to break the building garbage, but the single crushing is not complete enough for the building garbage, and the larger concrete blocks are mixed with the smaller concrete blocks after crushing, which needs manual screening, time-consuming and laborious;

[0005] 2) the existing building garbage rubbing crusher produces dust when crushing the building garbage, which is easy to scatter to the outside through the feeding port, thereby causing environmental pollution and dirty working environment;

[0006] 3) the crushed concrete blocks contain many metal fragments, and the single discharging mode is easy to mix the metal fragments with other crushing products, which is difficult to pick manually. CONTENT OF THE UTILITY MODEL

[0007] In order to overcome the defects of the prior art pointed out above, the present inventors have made in-depth research, and after a lot of creative labor, the utility model is completed.

[0008] Specifically, the technical problem to be solved by the utility model is to provide a building garbage rubbing crusher to solve the technical problem that the existing building garbage rubbing crusher is not complete enough for the building garbage, and the larger concrete blocks are easy to be mixed with the smaller concrete blocks after crushing, which needs manual screening, time-consuming and laborious.

[0009] To solve the above technical problems, the utility model provides the following technical scheme:

[0010] The utility model provides a kind of construction waste crushing device, including crushing box, the crushing mechanism for achieving construction waste crushing is equipped in the crushing box, the top of the crushing box is fixedly installed with dust removal cabin being communicated with the cavity in the crushing box, the dust removal cabin is away from the one end of the crushing box with feeding opening, and the dust removal cabin is equipped with dust removal mechanism to avoid broken dust to drift outward, the lower of the crushing box is equipped with screening mechanism to screen construction waste, the crushing mechanism is located between the dust removal mechanism and the screening mechanism;

[0011] The crushing mechanism includes a crushing roller rotatably mounted in the crushing box and driven by a first driving device, the top of the crushing box has a discharge opening on one side that is communicated with the dust removal cabin, and the crushing roller is located below the discharge opening.

[0012] The screening mechanism includes a screen bed located below the crushing box, the bottom of the crushing box is fixedly connected with the screen bed, the screen bed is provided with a screen plate, the screen plate is located directly below the crushing roller, and the screen plate is inclinedly arranged, the bottom end of the screen plate is hingedly connected with the screen bed through a connecting shaft, one end of the screen bed is provided with a second driving device for driving the top end of the screen plate to lift, the other end of the screen bed is provided with a discharge slot, the discharge slot is located below the screen plate, and the discharge slot corresponds to the bottom end of the screen plate.

[0013] As an improved technical solution, the first driving device includes a first driving motor fixedly installed outside the crushing box, and an output shaft of the first driving motor is in transmission connection with the crushing roller.

[0014] The crushing box is also fixedly installed with a stop block, one side of the stop block towards the crushing roller has an arc surface structure matched with the crushing roller.

[0015] As an improved technical solution, the second driving device includes an electric push rod fixedly installed at one end of the screen bed, a slide rod is connected to the piston shaft end of the electric push rod, a sliding groove is formed on the screen bed in a direction close to or away from the electric push rod, the sliding groove is correspondingly formed on both sides of the screen bed, both ends of the slide rod are respectively extended to the sliding groove and matched with the sliding groove, and the slide rod is slidably installed on the screen bed through the sliding groove.

[0016] A connecting rod is arranged between the slide rod and the screen plate, two connecting rods are respectively arranged on both sides of the screen plate, one end of the connecting rod is hingedly connected with the end of the slide rod, and the other end of the connecting rod is hingedly connected with the top end of the screen plate.

[0017] As an improved technical scheme, the screening mechanism further comprises a foreign matter removing box fixedly installed below the sieve bed, the top of the foreign matter removing box is provided with a material dropping opening corresponding to the discharge chute, and a magnetic roller driven by a third driving device is rotatably installed in the foreign matter removing box, the magnetic roller is located below the material dropping opening and is correspondingly arranged with the material dropping opening.

[0018] As an improved technical scheme, the third driving device comprises a second driving motor fixedly installed outside the foreign matter removing box, and an output shaft of the second driving motor is in transmission connection with one end of the magnetic roller.

[0019] As an improved technical scheme, the foreign matter removing box is further provided with a receiving hopper, the receiving hopper is obliquely arranged, the top end of the receiving hopper extends into the foreign matter removing box and corresponds to the magnetic roller, the bottom end of the receiving hopper is located outside the foreign matter removing box, the bottom end of the receiving hopper is installed with a moving wheel through a support, the two sides of the receiving hopper are both fixedly installed with a limiting block, the foreign matter removing box is provided with a limiting slot corresponding to the limiting block, and the receiving hopper is slidably installed on the foreign matter removing box in the direction of approaching / away from the magnetic roller through the limiting block and the limiting slot.

[0020] As an improved technical scheme, the dust removing mechanism comprises a water spraying pipe driven by a fourth driving device, a plurality of atomizing nozzles are uniformly arranged on the water spraying pipe along the length direction of the water spraying pipe, a water tank is arranged outside the dust removing cabin, the water tank is in communication with the water spraying pipe through a water pump and a water supply pipe, and under the driving of the fourth driving device, the water spraying pipe is located outside the dust removing cabin in the building waste feeding state and extends into the dust removing cabin in the building waste crushing state.

[0021] As an improved technical scheme, the fourth driving device comprises a third driving motor fixedly installed outside the dust removing cabin, a slide rail seat is further fixedly installed outside the dust removing cabin, the water spraying pipe is slidably installed on the slide rail seat in the direction of approaching / away from the dust removing cabin, a through hole corresponding to the water spraying pipe and allowing the water spraying pipe to pass through is formed in one side of the dust removing cabin, a threaded shaft parallel to the water spraying pipe is rotatably installed outside the slide rail seat, a sliding block is arranged between the threaded shaft and the water spraying pipe, a guide groove for realizing the limiting sliding of the sliding block is formed in the side of the slide rail seat close to the threaded shaft, one end of the sliding block extends into the slide rail seat through the guide groove and is fixedly connected with the water spraying pipe, and the other end of the sliding block extends out of the slide rail seat through the guide groove and is threadedly connected with the threaded shaft.

[0022] After the above technical scheme is adopted, the beneficial effects of the present application are as follows:

[0023] 1. The piston shaft end of the electric push rod is stretched to push the sliding rod to move in the sliding groove, so that the larger building waste pieces screened by the inclined screen plate can move to the discharge groove side, and in the process, the smaller building waste pieces are prevented from scattering through the integral stop rail on the screen bed, so that the size of the building waste after crushing can be automatically screened, and manual screening is not required.

[0024] 2. The water spray pipe is moved in the through hole in the dust removal cabin in parallel with the threaded shaft under the limitation of the guide groove in the sliding rail seat, so that the water spray pipe is located in the dust removal cabin after passing through the through hole, and the water in the water tank is pumped out through the water pump on the water supply pipe connected with the water spray pipe and sprayed out through the atomizing nozzle on the water spray pipe, so that the dust diffusion caused by crushing in the dust removal cabin is avoided.

[0025] 3. The receiving hopper moves in the limiting slot in the impurity removal box under the limitation of the limiting block, and finally the top end of the receiving hopper abuts against the rotating impurity removal box, so that the metal on the impurity removal box is scraped off, thereby separating the metal fragments from the building waste pieces, and manual screening of the metal fragments is not required. BRIEF DESCRIPTION OF DRAWINGS

[0026] In order to more clearly illustrate the technical scheme of the embodiments of the present application, the following will briefly introduce the drawings needed to be used in the embodiment description. Obviously, the drawings in the following description are only some embodiments of the present application, and for those skilled in the art, other drawings can also be obtained without creative labor under the premise of the drawings. Among them:

[0027] Figure 1 It is a three-dimensional structure diagram of the building waste crushing device of the present application.

[0028] Figure 2 It is a sectional view structure diagram of the building waste crushing device of the present application.

[0029] Figure 3 It is a related structure diagram of the screen bed and screen plate of the building waste crushing device of the present application.

[0030] Figure 4 It is a related structure diagram of the water spray pipe and dust removal box of the building waste crushing device of the present application.

[0031] Figure 5 It is a sectional view structure diagram of the impurity removal box of the building waste crushing device of the present application.

[0032] EXPLANATION OF REFERENCE NUMERALS:

[0033] 1, crushing box; 2, dust removal cabin; 3, sieve bed; 4, connecting shaft; 5, sieve plate; 6, discharge chute; 7, chute; 8, slide rod; 9, connecting rod; 10, electric push rod; 11, crushing roller; 12, stop block; 13, slide rail seat; 14, water spray pipe; 15, water tank; 16, sliding block; 17, threaded shaft; 18, impurity removal box; 19, magnetic roller; 20, receiving hopper; 21, limiting block; 22, moving wheel; 23, first driving motor; 24, second driving motor; 25, third driving motor. DETAILED DESCRIPTION

[0034] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0035] It should be noted that all directional indications (such as up, down, left, right, front, back, etc.) in the embodiments of the present application are only used to explain the relative positional relationship, movement condition, etc. between components in a certain posture (as shown in the drawings), and if the certain posture changes, the directional indications will also change accordingly.

[0036] Meanwhile, "and / or" or "and / or" appearing throughout the text means that it includes three schemes. Taking "A and / or B" as an example, it includes A scheme, or B scheme, or A and B schemes that meet at the same time.

[0037] In addition, the description of "first", "second" and the like in the present application is only for the purpose of description, and cannot be understood as indicating or implying the relative importance of the indicated technical features or implicitly indicating the number of the indicated technical features. Therefore, the features limited by "first", "second" can explicitly or implicitly include at least one of the features. In addition, the technical solutions of each embodiment can be combined with each other, but it must be based on the realization of ordinary skilled in the art, when the combination of technical solutions appears contradictory or unachievable, it should be considered that the combination of technical solutions does not exist, and is not within the scope of protection required by the present application.

[0038] For example, Figures 1 to 5As shown, the embodiment provides a building waste crushing device, which comprises a crushing box 1, a crushing mechanism is arranged in the crushing box 1 to realize crushing of the building waste, a dust removal cabin 2 is fixedly installed on the top of the crushing box 1 and communicates with the inner cavity of the crushing box 1, the dust removal cabin 2 is provided with a feeding port at the end away from the crushing box 1, and the dust removal cabin 2 is provided with a dust removal mechanism to avoid the outward diffusion of the dust generated during the crushing, a screening mechanism is arranged below the crushing box 1 to screen the building waste, the crushing mechanism is located between the dust removal mechanism and the screening mechanism, the crushing mechanism comprises a crushing roller 11 rotatably installed in the crushing box 1 and driven by a first driving device, the top of the crushing box 1 is provided with a discharging port communicating with the dust removal cabin 2, the crushing roller 11 is located below the discharging port, the screening mechanism comprises a sieve bed 3 located below the crushing box 1, the bottom of the crushing box 1 is fixedly connected with the sieve bed 3, a sieve plate 5 is arranged on the sieve bed 3 and located directly below the crushing roller 11, and the sieve plate 5 is arranged obliquely, the bottom end of the sieve plate 5 is hingedly connected with the sieve bed 3 through a connecting shaft 4, one end of the sieve bed 3 is provided with a second driving device to drive the top end of the sieve plate 5 to lift, the other end of the sieve bed 3 is provided with a discharging groove 6 located below the sieve plate 5 and corresponding to the bottom end of the sieve plate 5, the building waste put into the dust removal cabin 2 can enter the crushing box 1 through the discharging port, the building waste in the crushing box 1 is crushed and then falls onto the sieve bed 3, a blocking edge is arranged around the sieve bed 3 and is an integral structure of the sieve bed 3, so that the screened building waste can be prevented from scattering from the sieve bed 3, a first avoiding port is formed in one side of the crushing box 1 for reciprocating vibration of the sieve plate 5, and the top end of the sieve plate 5 extends to the outside of the crushing box 1 through the first avoiding port, so that the sieve plate 5 can screen the building waste crushed in the crushing box 1 according to the size, thereby avoiding manual screening.

[0039] The first driving device comprises a first driving motor 23 fixedly installed outside the crushing box 1, the output shaft of the first driving motor 23 is in transmission connection with the crushing roller 11, and a blocking block 12 is also fixedly installed in the crushing box 1, one side of the blocking block 12 facing the crushing roller 11 is provided with an arc surface structure matched with the crushing roller 11, the first driving motor 23 can drive the crushing roller 11 to rotate in the crushing box 1 to crush the building waste, the blocking block 12 can avoid the crushing roller 11 through the arc surface structure, so that the crushing roller 11 can rotate smoothly and the activity range of the building waste in the crushing box 1 can be limited, thereby improving the crushing effect.

[0040] The second driving device comprises an electric push rod 10 fixedly installed at one end of the sieve bed 3, a piston shaft end of the electric push rod 10 is connected with a sliding rod 8, a sliding groove 7 is formed on the sieve bed 3 in a direction close to or away from the electric push rod 10, the sliding groove 7 is correspondingly formed at both sides of the sieve bed 3, both ends of the sliding rod 8 extend to the sliding groove 7 and are matched with the sliding groove 7, the sliding rod 8 is slidably installed on the sieve bed 3 through the sliding groove 7, a connecting rod 9 is arranged between the sliding rod 8 and the sieve net plate 5, two connecting rods 9 are correspondingly arranged at both sides of the sieve net plate 5, one end of the connecting rod 9 is hingedly connected with the end of the sliding rod 8, the other end of the connecting rod 9 is hingedly connected with the top end of the sieve net plate 5, the electric push rod 10 can drive the sliding rod 8 to move in the sliding groove 7 through the extension of the piston shaft end, the deflection angle of the connecting rod 9 hingedly connected with both ends of the sliding rod 8 changes, the sieve net plate 5 hingedly connected with the other end of the connecting rod 9 can be deflected on the sieve bed 3 with the connecting shaft 4 as the center, so as to create an inclination angle, so that the construction waste pieces screened by the sieve net plate 5 can move to one side of the discharge chute 6.

[0041] The screening mechanism further comprises a foreign matter removing box 18 fixedly installed below the sieve bed 3, the top of the foreign matter removing box 18 is provided with a discharging opening corresponding to the discharge chute 6, a magnetic roller 19 driven by a third driving device is rotatably installed in the foreign matter removing box 18, the magnetic roller 19 is located below the discharging opening and is correspondingly arranged with the discharging opening, the construction waste pieces screened by the sieve net plate 5 enter the foreign matter removing box 18 through the discharging opening after passing through the discharge chute 6, the magnetic roller 19 has magnetism and can adsorb and remove the metal in the construction waste pieces in the foreign matter removing box 18.

[0042] The third driving device comprises a second driving motor 24 fixedly installed outside the foreign matter removing box 18, an output shaft of the second driving motor 24 is in transmission connection with one end of the magnetic roller 19, the second driving motor 24 can drive the magnetic roller 19 to rotate in the foreign matter removing box 18 and adsorb the metal pieces in the foreign matter removing box 18.

[0043] The foreign matter removing box 18 is further provided with a receiving hopper 20, the receiving hopper 20 is arranged in an inclined manner, the top end of the receiving hopper 20 extends into the foreign matter removing box 18 and corresponds to the magnetic roller 19, the bottom end of the receiving hopper 20 is located outside the foreign matter removing box 18, the bottom end of the receiving hopper 20 is installed with a moving wheel 22 through a support, the two sides of the receiving hopper 20 are both fixedly installed with a limiting block 21, the foreign matter removing box 18 is provided with a limiting slot corresponding to the limiting block 21, the receiving hopper 20 is slidably installed on the foreign matter removing box 18 in a direction close to or away from the magnetic roller 19 through the limiting block 21 and the limiting slot, in the working state of the receiving hopper 20, the moving wheel 22 connected with the support can be pushed into the foreign matter removing box 18, and moves in the limiting slot in the foreign matter removing box 18 under the limitation of the limiting block 21, and finally the top end of the receiving hopper 20 abuts against the rotating magnetic roller 18, so as to scrape off the adsorbed metal on the magnetic roller 18.

[0044] The dust removal mechanism comprises a water spraying pipe 14 driven by the fourth driving device, a plurality of atomizing nozzles are uniformly arranged on the water spraying pipe 14 along the length direction of the water spraying pipe 14, a water tank 15 is arranged outside the dust removal cabin 2, the water tank 15 is communicated with the water spraying pipe 14 through a water pump and a water supply pipe, and under the driving of the fourth driving device, the water spraying pipe 14 is located outside the dust removal cabin 2 in the building waste feeding state, and the water spraying pipe 14 extends into the dust removal cabin 2 in the building waste crushing state. The water tank 15 can atomize and spray water in the water tank 15 into the dust removal cabin 2 through the atomizing nozzles by the water pump and the connected water supply pipe, and in the feeding state, the water spraying pipe 14 is located outside the dust removal cabin 2, so as to avoid affecting the feeding of the building waste.

[0045] The fourth driving device comprises a third driving motor 25 fixedly installed outside the dust removal cabin 2, a slide rail seat 13 is also fixedly installed outside the dust removal cabin 2, the water spraying pipe 14 is slidingly installed on the slide rail seat 13 along the direction close to / away from the dust removal cabin 2, a through hole corresponding to the water spraying pipe 14 and for the water spraying pipe 14 to pass through is arranged on one side of the dust removal cabin 2, a threaded shaft 17 parallel to the water spraying pipe 14 is rotatably installed outside the slide rail seat 13, a sliding block 16 is arranged between the threaded shaft 17 and the water spraying pipe 14, a guide groove is arranged on one side of the slide rail seat 13 close to the threaded shaft 17 to realize the limited sliding of the sliding block 16, one end of the sliding block 16 extends into the slide rail seat 13 through the guide groove and is fixedly connected with the water spraying pipe 14, the other end of the sliding block 16 extends out of the slide rail seat 13 through the guide groove and is threadedly connected with the threaded shaft 17, the third driving motor 25 can drive the connected threaded shaft 17 to rotate, so that the threadedly connected sliding block 16 moves in the guide groove of the slide rail seat 13, when the sliding block 16 moves in the guide groove, the connected water spraying pipe 14 moves in the through hole of the dust removal cabin 2, the length of the dust removal cabin 2 is changed, and when the water spraying pipe 14 moves, it always keeps parallel with the threaded shaft 17.

[0046] In use, first through the dust removal cabin 2 in the feeding port, the construction waste is sent into the crushing box 1 through the dust removal cabin 2, the first drive motor 23 output shaft drives the connected crushing roller 11 to rotate in the crushing box 1, and the range of activity of the construction waste in the crushing box 1 is limited by the stop block 12, the crushed construction waste falls on the inclined screen plate 5 on the sieve bed 3 through the discharge port in the crushing box 1, and in the process, the piston shaft end of the electric push rod 10 is extended to push the sliding rod 8 to move in the sliding groove 7, the deflection angle of the connecting rod 9 hinged at both ends of the sliding rod 8 changes, the screen plate 5 hinged at the other end of the connecting rod 9 deflects on the sieve bed 3 with the connecting shaft 4 as the center, thereby creating an inclination angle, so that the larger construction waste fragments after screening can move to one side of the discharge chute 6, and in the process, the smaller construction waste fragments after screening are prevented from falling through the integral stop along on the sieve bed 3, so that the crushed construction waste can be automatically screened by size, thereby eliminating the need for manual screening, and when the construction waste is crushed in the crushing box 1, the third drive motor 25 output shaft drives the threaded shaft 17 to rotate, so that the sliding block 16 connected by threads moves in the guide groove of the sliding rail seat 13, and the water spray pipe 14 moves in the through hole of the dust removal cabin 2 in a direction parallel to the threaded shaft 17, so that the water spray pipe 14 is located in the dust removal cabin 2 after passing through the through hole, and after the water in the water tank 15 is pumped out through the water pump on the water supply pipe connected to the water spray pipe 14, it is atomized and sprayed out through the atomizing nozzle on the water spray pipe 14, thereby preventing the dust generated by crushing from spreading in the dust removal cabin 2, and in the process, the construction waste fragments in the discharge chute 6 enter the impurity removal box 18 through the discharge port, and pass through the magnetic roller 19 driven by the second drive motor 24 output shaft, the magnetic roller 19 with magnetism adsorbs the metal fragments in the construction waste, and after the work is completed, the receiving hopper 20 connected with the moving wheel 22 through the support is pushed into the impurity removal box 18, so that the receiving hopper 20 moves in the limiting slot of the impurity removal box 18 under the limitation of the limiting block 21, and finally the top end of the receiving hopper 20 is attached to the rotating impurity removal box 18, so that the metal on the impurity removal box 18 is scraped off, thereby separating the metal fragments from the construction waste fragments, thereby eliminating the need for manual screening of metal fragments.

[0047] It should be understood that the use of these embodiments is only for the purpose of illustrating the present application and is not intended to limit the scope of protection of the present application. In addition, it should also be understood that after reading the technical content of the present application, those skilled in the art can make various modifications, modifications and / or variations to the present application, and all these equivalent forms also fall within the protection scope defined by the claims attached hereto.

Claims

1. A construction waste pulverizing apparatus, characterized by: The utility model provides a building rubbish crushing device, which comprises a crushing box (1) provided with a crushing mechanism for crushing building rubbish, a dust removal cabin (2) connected with the crushing box (1) and arranged on the top of the crushing box (1), a feeding port arranged on the end of the dust removal cabin (2) away from the crushing box (1), a dust removal mechanism arranged on the dust removal cabin (2) for preventing dust from being scattered, a screening mechanism arranged below the crushing box (1) for screening the building rubbish, and the crushing mechanism is arranged between the dust removal mechanism and the screening mechanism. The crushing mechanism comprises a crushing roller (11) rotatably arranged in the crushing box (1) and driven by a first driving device, and the crushing box (1) is provided with a discharging port on one side of the top of the crushing box (1) and connected with the dust removal cabin (2), and the crushing roller (11) is arranged below the discharging port. The screening mechanism comprises a screening bed (3) arranged below the crushing box (1), the bottom of the crushing box (1) is fixedly connected with the screening bed (3), a screening mesh plate (5) is arranged on the screening bed (3), the screening mesh plate (5) is arranged below the crushing roller (11) and is inclined, the bottom end of the screening mesh plate (5) is hingedly connected with the screening bed (3) through a connecting shaft (4), one end of the screening bed (3) is provided with a second driving device for driving the top end of the screening mesh plate (5) to lift, and the other end of the screening bed (3) is provided with a discharging groove (6) arranged below the screening mesh plate (5) and corresponding to the bottom end of the screening mesh plate (5).

2. The construction waste shredding device of claim 1, wherein: The first driving device comprises a first driving motor (23) fixedly arranged outside the crushing box (1), and the output shaft of the first driving motor (23) is in transmission connection with the crushing roller (11). The crushing box (1) is further provided with a stop block (12) fixedly arranged therein, and the side of the stop block (12) facing the crushing roller (11) is provided with an arc surface structure matched with the crushing roller (11).

3. The construction waste shredding device of claim 1, wherein: The second driving device comprises an electric push rod (10) fixedly arranged at one end of the screening bed (3), the piston shaft end of the electric push rod (10) is connected with a sliding rod (8), the screening bed (3) is provided with a sliding groove (7) arranged in the direction close to or away from the electric push rod (10), the sliding groove (7) is arranged on both sides of the screening bed (3), the both ends of the sliding rod (8) are respectively extended into the sliding groove (7) and matched with the sliding groove (7), and the sliding rod (8) is slidably arranged on the screening bed (3) through the sliding groove (7). The sliding rod (8) and the screening mesh plate (5) are connected through a connecting rod (9), two connecting rods (9) are arranged on both sides of the screening mesh plate (5) respectively, one end of the connecting rod (9) is hingedly connected with the end of the sliding rod (8), and the other end of the connecting rod (9) is hingedly connected with the top end of the screening mesh plate (5).

4. The construction waste shredding device of claim 3, wherein: The screening mechanism further comprises a foreign matter removing box (18) fixedly installed below the screening bed (3), the top of the foreign matter removing box (18) is provided with a discharging opening corresponding to the discharging chute (6), and a magnetic roller (19) driven by a third driving device is rotatably installed in the foreign matter removing box (18), the magnetic roller (19) is located below the discharging opening and is correspondingly arranged with the discharging opening.

5. The construction waste shredding device of claim 4, wherein: The third driving device comprises a second driving motor (24) fixedly installed outside the foreign matter removing box (18), and the output shaft of the second driving motor (24) is in transmission connection with one end of the magnetic roller (19).

6. The construction waste shredding device of claim 4, wherein: The foreign matter removing box (18) is further provided with a receiving hopper (20), the receiving hopper (20) is obliquely arranged, the top end of the receiving hopper (20) extends into the foreign matter removing box (18) and corresponds to the magnetic roller (19), the bottom end of the receiving hopper (20) is located outside the foreign matter removing box (18), the bottom end of the receiving hopper (20) is installed with a moving wheel (22) through a support, and the two sides of the receiving hopper (20) are fixedly installed with limiting blocks (21), the foreign matter removing box (18) is provided with limiting grooves corresponding to the limiting blocks (21), and the receiving hopper (20) is slidably installed on the foreign matter removing box (18) in the direction of approaching / away from the magnetic roller (19) through the limiting blocks (21) and the limiting grooves.

7. The construction waste shredding device according to any one of claims 1-6, characterized in that: The dust removing mechanism comprises a water spraying pipe (14) driven by a fourth driving device, a plurality of atomizing nozzles are uniformly arranged on the water spraying pipe (14) along the length direction of the water spraying pipe (14), a water tank (15) is arranged outside the dust removing cabin (2), the water tank (15) is in communication with the water spraying pipe (14) through a water pump and a water supply pipe, and under the driving of the fourth driving device, the water spraying pipe (14) is located outside the dust removing cabin (2) when the building waste is in the state of being fed, and the water spraying pipe (14) extends into the dust removing cabin (2) when the building waste is in the state of being crushed.

8. The construction waste shredding device of claim 7, wherein: The fourth driving device comprises a third driving motor (25) fixedly installed outside the dust removing cabin (2), a slide rail seat (13) is further fixedly installed outside the dust removing cabin (2), the water spraying pipe (14) is slidably installed on the slide rail seat (13) in the direction of approaching / away from the dust removing cabin (2), a through hole corresponding to the water spraying pipe (14) and allowing the water spraying pipe (14) to pass through is formed in one side of the dust removing cabin (2), a threaded shaft (17) parallel to the water spraying pipe (14) is rotatably installed outside the slide rail seat (13), a sliding block (16) is arranged between the threaded shaft (17) and the water spraying pipe (14), a guide groove for realizing limited sliding of the sliding block (16) is formed in the side of the slide rail seat (13) close to the threaded shaft (17), one end of the sliding block (16) extends into the slide rail seat (13) through the guide groove and is fixedly connected with the water spraying pipe (14), and the other end of the sliding block (16) extends out of the slide rail seat (13) through the guide groove and is threadedly connected with the threaded shaft (17).

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