Recycled concrete preparation process based on building solid waste

Abstract

The invention relates to the technical field of concrete preparation processes, in particular to a recycled concrete preparation process based on building solid waste, which comprises the following steps: raw material acquisition, raw material crushing, crushed concrete screening, crushed concrete washing and finished product mixing. According to the scheme, a steel bar fragment recycling mechanism is arranged in a crushing mechanism in the raw material crushing step, and steel bar fragments mixed in concrete fragments are conveniently adsorbed and moved to the external environment through a ball screw to be collected in a mode that an electromagnet is electrified to generate magnetic force to absorb metal materials, so that the recycling operation of the steel bar fragments is facilitated.

Description

Technical Field

[0001] The invention relates to the technical field of concrete preparation technology, and in particular to a recycled concrete preparation technology based on construction solid waste, which is used to screen out steel bar fragments while screening fragments to avoid wear on filter mesh wires. Background Art

[0002] As people pay more and more attention to environmental protection, recycled concrete, as a sustainable building material, has gradually attracted people's attention and favor. Recycled concrete refers to concrete made from recycled materials such as waste concrete and construction waste. Compared with the traditional concrete production process, the recycled concrete production process is more environmentally friendly, energy-saving and economical.

[0003] In the prior art, the production process of recycled concrete includes crushing, screening, washing and mixing. Concrete can be obtained through the above processes. However, after the existing recycled concrete is crushed, a large amount of steel bar fragments are mixed in the concrete fragments. When the steel bar fragments directly enter the screening machine without being recycled, due to the vibration of the screen, the hardness of the steel bar fragments is high, and the surface of the steel bar fragments is relatively sharp. As the screening working time increases, the sharp parts of the steel bar fragments are prone to multiple frictions with the mesh wire of the filter during the vibration process, which is easy to cause wear to the mesh wire of the filter, increasing the maintenance cost. Moreover, the steel bar fragments, as metal materials, also have recycling value. Summary of the invention

[0004] The purpose of the present invention is to solve the shortcomings of the prior art and to propose a process for preparing recycled concrete based on construction solid waste.

[0005] To achieve the above objectives, the technical solution adopted by the present invention is: a process for preparing recycled concrete based on construction solid waste, comprising the following steps:

[0006] Step 1: Raw material acquisition: Collect waste concrete rubble, construction waste, and bricks;

[0007] Step 2, crushing the raw materials: crushing the raw materials through a crushing mechanism to crush them into particles of a size suitable for recycled concrete production, while recovering steel bar fragments in the concrete fragments;

[0008] Step 3: Screening of concrete crushed materials: filtering the crushed raw materials through screening equipment to remove impurities in the concrete crushed materials;

[0009] Step 4: Washing the concrete crushed materials: Washing the sieved concrete crushed materials to remove impurities such as soil and sand from the concrete crushed materials to improve the quality of the concrete crushed materials;

[0010] Step 5: Finished product mixing: Mix the washed concrete crushed materials with cement, sand, water, etc. in a certain proportion to obtain recycled concrete.

[0011] The present scheme also discloses the specific structure of the crushing mechanism according to the above-mentioned preparation process, wherein the crushing mechanism comprises a second shell, the top and the bottom of the second shell are provided with a first opening, two symmetrically arranged crushing rollers are placed inside the second shell, the two ends of the two crushing rollers respectively penetrate the two symmetrical surfaces of the second shell and extend to the outside, one end of the two crushing rollers are fixedly provided with gears, and the two gears are meshed, one end of one of the crushing rollers is connected to a second driving motor, the casing of the second driving motor is installed on the outside of the second shell through a motor bracket, and the bottom of the second shell is connected to a steel bar fragment recovery mechanism.

[0012] Preferably, the steel bar fragment recovery mechanism includes a first shell, the top of the first shell is installed on the bottom of the second shell, the top and bottom of the first shell are each provided with a second opening, the first opening and the second opening are connected, and third openings are each provided at both ends of the first shell, the interior of the first shell is connected with a filter screen through a plurality of elastic mechanisms, the filter screen and the inner cavity of the first shell are matched and connected, an electromagnet is provided above the filter screen, a mounting plate is installed on the top of the electromagnet, an electric cylinder is installed on the top of the mounting plate, the outer shell of the electric cylinder is installed on the bottom of the connecting block, a ball screw is installed through the side of the connecting block, and one end of the ball screw is connected to the first drive motor.

[0013] Preferably, fixed long strips are installed at both ends of the mounting plate, a dovetail groove is opened on the side of the fixed long strip, a dovetail block is slidably installed inside the dovetail groove, a movable long strip is installed on the side of the dovetail block, and one end of the movable long strip is installed at the bottom of the connecting block.

[0014] Preferably, second fixing rods are installed at both ends of the connecting block, both ends of the two second fixing rods respectively pass through the third opening and extend to the outside, second support rods are installed at both ends of the two second fixing rods, connecting rods are installed at the bottom ends of the four second support rods, and one end of the four connecting rods is respectively installed on two symmetrical sides of the first shell.

[0015] Preferably, two first fixing rods are provided inside the first shell, one end of the two first fixing rods passes through the two third openings respectively and is installed on the side faces of the four second support rods, racks are installed on the side faces of the two first fixing rods, the racks are located inside the first shell, meshing gears are provided below the racks, and fixed shafts arranged with the same central axis are installed through the side faces of the gears, a cam is installed at one end of the fixed shaft, a fixing plate is movably sleeved at the other end of the fixed shaft, a support plate is installed on the top of the fixing plate, one end of the support plate extends to one side of the first fixing rod, a slider is installed on one end of the support plate, a slide groove is opened on the side face of the first fixing rod, and one end of the slider extends to the inside of the slide groove.

[0016] Preferably, a first extension plate is installed at the bottom of the fixed plate, the first extension plate is located below the mounting plate, a second extension plate is installed on the top of the mounting plate, one end of the first extension plate and the second extension plate are positioned correspondingly, and a second telescopic rod is installed between one end of the first extension plate and the second extension plate.

[0017] Preferably, the elastic mechanism includes a first telescopic rod, the bottom end of the first telescopic rod is installed on the inner bottom surface of the first shell, a fixing plate is installed on the top end of the first telescopic rod, the top of the fixing plate is installed on the bottom of the frame in the filter, and a compression spring is provided on the surface movable sleeve of the first telescopic rod, and the two ends of the compression spring are respectively installed on the inner bottom surface of the first shell and the bottom of the frame in the filter.

[0018] Preferably, two steel bar fragment storage boxes are provided on the outer side of the first shell, the two steel bar fragment storage boxes are respectively located below the two third openings, and the two steel bar fragment storage boxes are respectively installed on the top of the four connecting rods.

[0019] Preferably, first support rods are installed on the sides of the two steel bar fragment storage boxes, and the two first support rods are movably mounted on both ends of the ball screw through bearings, and a baffle 11 is installed between the top ends of the two first support rods 7.

[0020] Compared with the prior art, the present invention has the following beneficial effects:

[0021] This solution sets up a steel bar fragment recovery mechanism under the crushing roller, and uses the electromagnet to generate magnetic force to absorb metal materials, so as to conveniently adsorb the steel bar fragments mixed in the concrete fragments and move them to the external environment for collection through the ball screw, thereby facilitating the recovery operation of the steel bar fragments. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a schematic diagram of the axonometric structure of the crushing mechanism of the present invention;

[0023] Figure 2 It is a schematic cross-sectional structural diagram of the crushing mechanism of the present invention;

[0024] Figure 3 It is a schematic diagram of the connection structure of the ball screw, the mounting plate and the cam of the crushing mechanism of the present invention;

[0025] Figure 4 It is a schematic diagram of the connection structure of the cam and the mounting plate of the crushing mechanism of the present invention;

[0026] Figure 5 It is a schematic diagram of the connection structure of the movable long strip block and the fixed long strip block of the crushing mechanism of the present invention;

[0027] Figure 6 It is a schematic diagram of the connection structure between the mounting plate and the second telescopic rod of the crushing mechanism of the present invention;

[0028] Figure 7 It is a schematic diagram of the elastic mechanism structure of the crushing mechanism of the present invention.

[0029] In the figure: a first drive motor 1, a second drive motor 2, a steel bar fragment storage box 3, a first shell 4, a support leg 5, a first fixed rod 6, a first support rod 7, a fixed plate 8, a second support rod 9, a second fixed rod 10, a baffle 11, a gear 12, a second shell 13, a crushing roller 14, a filter screen 15, a first telescopic rod 16, a cam 17, a rack 18, a compression spring 19, a movable long block 20, a dovetail block 21, a connecting block 22, a mounting plate 23, a gear 24, a connecting rod 25, an electric cylinder 26, an electromagnet 27, a fixed long block 28, a fixed shaft 29, a support plate 30, a fixed plate 31, a first extension plate 32, a second telescopic rod 33, a second extension plate 34, a slider 35, a slide groove 36, a ball screw 37, and a dovetail groove 38. DETAILED DESCRIPTION

[0030] The following description is used to disclose the present invention so that those skilled in the art can implement the present invention. The preferred embodiments described below are only examples, and those skilled in the art may think of other obvious variations.

[0031] A process for preparing recycled concrete based on construction solid waste comprises the following steps:

[0032] Step 1: Raw material acquisition: Collect waste concrete rubble, construction waste, and bricks;

[0033] Step 2, crushing the raw materials: crushing the raw materials through a crushing mechanism to crush them into particles of a size suitable for recycled concrete production, while recovering steel bar fragments in the concrete fragments;

[0034] Step 3: Screening of concrete crushed materials: filtering the crushed raw materials through screening equipment to remove impurities in the concrete crushed materials;

[0035] Step 4: washing the concrete crushed materials: washing the sieved concrete crushed materials to remove impurities such as soil, sand, etc. in the concrete crushed materials, thereby improving the quality of the concrete crushed materials;

[0036] Step 5, finished product mixing: the washed concrete crushed materials are mixed with other concrete raw materials such as cement, sand, water, etc. in a certain proportion to obtain recycled concrete.

[0037] like Figure 1-7 As shown, the present solution also discloses a specific structure of a crushing mechanism according to the above preparation process, the crushing mechanism comprises a second shell 13, the top and bottom of the second shell 13 are both provided with a first opening, two symmetrically arranged crushing rollers 14 are placed inside the second shell 13, the two ends of the two crushing rollers 14 respectively penetrate the two symmetrical surfaces of the second shell 13 and extend to the outside, one end of the two crushing rollers 14 are fixedly sleeved with a gear 12, the two gears 12 are meshed, one end of one of the crushing rollers 14 is connected to a second drive motor 2, the shell of the second drive motor 2 is mounted on the outside of the second shell 13 through a motor bracket The bottom of the second shell 13 is connected with a steel bar fragment recovery mechanism. When the concrete gravel is crushed, the second drive motor 2 is powered on by controlling the second drive motor 2 to rotate in opposite directions through the two gears 12. The two crushing rollers 14 continuously apply external force to the concrete gravel. After the concrete gravel is continuously subjected to force, its own stability is reduced, which facilitates the crushing of the concrete gravel. At the same time, steel bars will be mixed in the concrete gravel. The steel bars are also subjected to the external force applied by the two crushing rollers 14, so that the steel bars are cut into pieces after being subjected to force, and fall to the top of the filter screen 15 with the concrete crushed materials.

[0038] The steel bar fragment recovery mechanism includes a first shell 4, the top of which is mounted on the bottom of the second shell 13 by screws, the top and bottom of the first shell 4 are both provided with second openings, the first opening and the second opening are communicated, and third openings are both provided at both ends of the first shell 4, the interior of the first shell 4 is connected with a filter 15 by a plurality of elastic mechanisms, the filter 15 is matched and connected with the inner cavity of the first shell 4, an electromagnet 27 is arranged above the filter 15, a mounting plate 23 is mounted on the top of the electromagnet 27 by screws, an electric cylinder 26 is mounted on the top of the mounting plate 23 by screws, the outer shell of the electric cylinder 26 is mounted on the bottom of the connecting block 22 by screws, a ball screw 37 is installed through the side of the connecting block 22, one end of the ball screw 37 is connected with a first drive motor 1, the first drive motor 1 drives the ball screw 37 to rotate, and the ball screw 37 is driven by the electric cylinder 26. The nut of the ball screw 37 drives the connecting block 22 to move synchronously, and the connecting block 22 drives the mounting plate 23 to move through the electric cylinder 26, and the mounting plate 23 drives the electromagnet 27 to move horizontally synchronously, which facilitates the electromagnet 27 to fully move in the inner cavity of the first shell 4, thereby improving the efficiency of recovering steel bar fragments; after the steel bar fragments are adsorbed on the electromagnet 27 by magnetic force, the active end of the electric cylinder 26 is controlled to contract, and the active end of the electric cylinder 26 drives the mounting plate 23 to move upward, and the mounting plate 23 drives the electromagnet 27 to move to a height sufficient to move out of the third opening, and then the first drive motor 1 can be controlled to drive the ball screw 37 to rotate, so as to facilitate the removal of the electromagnet 27 from the third opening, and then the electromagnet 27 is powered off, at which time the electromagnet 27 does not generate magnetic force, and the steel bar fragments on the electromagnet 27 fall off, which facilitates the recovery of the steel bar fragments.

[0039] Fixed long blocks 28 are installed at both ends of the mounting plate 23 by screws, and a dovetail groove 38 is provided on the side of the fixed long block 28. A dovetail block 21 is slidably installed inside the dovetail groove 38. A movable long block 20 is installed on the side of the dovetail block 21 by screws, and one end of the movable long block 20 is installed on the bottom of the connecting block 22 by screws. When the electric cylinder 26 drives the mounting plate 23 to move in the vertical direction, the mounting plate 23 drives the fixed long block 28 to slide on the dovetail block 21 through the dovetail groove 39, thereby improving the stability of the mounting plate 23 in the vertical direction.

[0040] The second fixing rods 10 are installed through both ends of the connecting block 22, and the two ends of the two second fixing rods 10 pass through the third opening and extend to the outside. The second support rods 9 are installed at both ends of the two second fixing rods 10 by screws, and the bottom ends of the four second support rods 9 are installed with connecting rods 25 by screws. One ends of the four connecting rods 25 are respectively installed on the two symmetrical sides of the first shell 4 by screws, and the two ends of the connecting block 22 slide on the surfaces of the two second fixing rods 10, which improves the stability of the connecting block 22 during the sliding process.

[0041] Two first fixing rods 6 are provided inside the first shell 4, one ends of the two first fixing rods 6 pass through the two third openings respectively and are installed on the sides of the four second support rods 9 by screws, the sides of the two first fixing rods 6 are installed with racks 18 by screws, the racks 18 are located inside the first shell 4, a meshing gear 24 is provided below the racks 18, the sides of the gears 24 are penetrated and installed with fixed shafts 29 arranged with the same central axis, one end of the fixed shaft 29 is installed with a cam 17 by screws, the other end of the fixed shaft 29 is movably sleeved with a fixing plate 31, the top of the fixing plate 31 is installed with a support plate 30 by screws, one end of the support plate 30 extends to one side of the first fixing rod 6, one end of the support plate 30 is installed with a slider 35 by screws, a slide groove 36 is provided on the side of the first fixing rod 6, one end of the slider 35 extends to the inside of the slide groove 36, as the second drive motor 1 controls the ball screw 37 to rotate, the nut of the ball screw 37 drives the connecting block 22 to move synchronously, and the connecting block 22 drives the mounting plate 2 3 synchronous movement, the connecting block 22 drives the fixed plate 31 to move synchronously, and the fixed plate 31 drives the cam 17 and the gear 24 to move synchronously through the fixed shaft 29. During the movement of the gear 24 on the rack 18, due to the mutual blocking of the gear blocks between the gear 24 and the rack 18, the gear 24 rotates on the rack 18 during the force movement process, and the gear 24 drives the fixed shaft 29 to rotate on the fixed plate 31. At the same time, the fixed shaft 29 drives the cam 17 to rotate synchronously. After the convex end of the cam 17 rotates to the top of the frame of the filter screen 15, the convex block of the cam 17 applies an external force to the frame. As the cam 17 continues to rotate, the convex block of the cam 17 pushes the filter screen 15 downward, and the cooperation between the filter screen 15 and the elastic mechanism facilitates the up and down movement of the filter screen 15 after being forced, so that the steel bar fragments and the concrete fragments are separated in the vertical direction, and the moving electromagnet 27 is cooperated to complete the adsorption of the steel bar fragments in the passage area, so as to avoid the problem of slipping of the mesh wire in the left and right screening mode and the magnetic adsorption of some steel bar fragments due to the slipping of the mesh wire, resulting in incomplete sorting.

[0042] A first extension plate 32 is installed at the bottom of the fixing plate 31 by screws, and the first extension plate 32 is located below the mounting plate 23. A second extension plate 34 is installed on the top of the mounting plate 23 by screws. The positions of one end of the first extension plate 32 and the second extension plate 34 correspond to each other, and a second telescopic rod 33 is installed between one end of the first extension plate 32 and the second extension plate 34 by screws. In the process of moving the steel bar fragments out of the first shell 4, in order to prevent the inner wall of the first shell 4 from blocking the movement of the electromagnet 27, it is necessary to move the mounting plate 23 downward by the electric cylinder 26. The mounting plate 23 drives the electromagnet 27 to move to a height that can pass through the third opening and then stops moving. At the same time, the mounting plate 23 moves synchronously through the second extension plate 34, and the second extension plate 34 pulls the length of the second telescopic rod 33 to extend, thereby avoiding separation between the mounting plate 23 and the cam 27. There is no need to manually repeatedly disassemble and assemble the mounting plate 23 and the cam 27, which is used to improve the stability of the connection between the mounting plate 23 and the cam 27.

[0043] The elastic mechanism includes a first telescopic rod 16, the bottom end of the first telescopic rod 16 is installed on the inner bottom surface of the first shell 4 by screws, the top of the first telescopic rod 16 is installed with a fixing plate 8 by screws, the top of the fixing plate 8 is installed on the bottom of the frame in the filter 15 by screws, and the surface of the first telescopic rod 16 is provided with a compression spring 19, and the two ends of the compression spring 19 are respectively installed on the inner bottom surface of the first shell 4 and the bottom of the frame in the filter 15 by screws. When the filter 15 receives the external force applied by the cam 17, the filter 15 moves downward after being forced, and the filter 15 pushes the fixing plate 8 to move synchronously, and the fixing plate 8 pushes the length of the first telescopic rod 16 to shrink, and at the same time, the fixing plate 8 pushes the length of the first telescopic rod 16 to shrink. The fixed plate 8 applies an external force to the compression spring 19, causing the length of the compression spring 19 to shrink, facilitating the downward movement of the filter 15. After the convex end of the cam 17 is separated from the frame of the filter 15, the compression spring 19 pushes the filter 15 in the opposite direction through its own force, and the filter 15 moves upward. After the cam 17 applies reciprocating pressure to the filter 15, the filter 15 moves back and forth up and down and produces an up and down movement. After the up and down movement, the filter makes the concrete fragments accumulated on its surface move synchronously and are layered in the vertical direction, which is convenient for sorting out the steel fragments. After being subjected to force and vibration, the concrete fragments are easy to fall from the filter holes of the filter 15, and their relatively large volume means they remain on the top of the filter 15.

[0044] Two steel bar fragment storage boxes 3 are provided on the outside of the first shell 4. The two steel bar fragment storage boxes 3 are respectively located under the two third openings. The two steel bar fragment storage boxes 3 are respectively installed on the top of the four connecting rods 25 by screws. The two steel bar fragment storage boxes 3 are used to receive the steel bar fragments dropped from the electromagnet 7, so as to facilitate the accumulation of the steel bar fragments.

[0045] The sides of the two steel bar fragment storage boxes 3 are both installed with first support rods 7 by screws. The two first support rods 7 are both movably mounted on the two ends of the ball screw 37 through bearing sleeves. A baffle 11 is installed between the top ends of the two first support rods 7 by screws. The baffle 11 blocks concrete fragments from the ball screw 37, preventing the concrete fragments from blocking the spiral movement of the nut in the ball screw 37, thereby improving the working stability of the ball screw 37.

[0046] In this solution, the first drive motor 1, the second drive motor 2, the electric cylinder 26 and the electromagnet 27 are all connected to the controller through wires, and the controller is connected to an external power supply through wires. The controller can be a PLC controller.

[0047] In this solution, four supporting legs 5 are connected to the outside of the second shell 13 by screws, and the bottom ends of the four supporting legs 5 extend to the bottom of the first shell 4, which is used to support the device and facilitate the concrete crushed materials to fall from the second opening at the bottom of the first shell 4, thereby facilitating the staff to receive the concrete crushed materials.

[0048] Working principle: first, the electromagnet 27 is energized to work, and the electromagnet 27 generates magnetic force after being energized, and then the movable end of the electric cylinder 26 is controlled to extend, and the electromagnet 27 is moved to the top near the top of the filter 15, and then the first drive motor 1 can be controlled to be energized to drive the rotation of the ball screw 37, and the ball screw 37 drives the electromagnet 27 to move through the electric cylinder 26 and the mounting plate 23. The electromagnet 27 absorbs the steel bar fragments through magnetic force during the horizontal movement, and the mounting plate 23 drives the gear 24 to move horizontally synchronously. After the gear 24 is stressed, it rotates on the rack 18, and the gear 24 drives the cam 17 to rotate synchronously through the fixed shaft 29. The convex end of the cam 17 applies an external force to the frame of the filter 15. Through the cooperation of the elastic mechanism, it is convenient for the filter 15 to move up and down after being stressed, so that the steel bar fragments and the concrete fragments are separated in the vertical direction, and the moving electromagnet 27 is cooperated to complete the adsorption of the steel bar fragments in the passage area, so as to avoid the problem of slipping of the mesh wire in the left and right screening mode and the magnetic adsorption of some steel bar fragments due to the slipping of the mesh wire, resulting in incomplete sorting.

[0049] After a certain amount of adsorption, the movable end of the electric cylinder 26 is controlled to retract. After the electric cylinder 26 drives the electromagnet 27 to move to a height where it can be moved out from the third opening, the first drive motor 1 is operated to control the rotation of the ball screw 37, so that the nut on the ball screw 37 drives the electromagnet 27 to move out from the third opening. Then, the electromagnet 27 is powered off, and the steel fragments on the electromagnet 27 fall off, thereby completing the recovery operation of the steel fragments.

[0050] By performing the above operation for several times, the steel bar fragments accumulated on the filter screen 15 can be completely recovered.

[0051] The above shows and describes the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The above embodiments and descriptions only describe the principles of the present invention. The present invention may be subject to various changes and improvements without departing from the spirit and scope of the present invention. These changes and improvements fall within the scope of the present invention. The scope of protection claimed by the present invention is defined by the attached claims and their equivalents.

Claims

1. A process for preparing recycled concrete based on construction solid waste, characterized in that: The following steps are involved: Step 1: Raw material acquisition: Collect waste concrete rubble, construction waste, and bricks; Step 2, crushing the raw materials: crushing the raw materials through a crushing mechanism to crush them into particles of a size suitable for recycled concrete production, while recovering steel bar fragments in the concrete fragments; Step 3: Screening of concrete crushed materials: filtering the crushed raw materials through screening equipment to remove impurities in the concrete crushed materials; Step 4: washing the concrete crushed materials: washing the sieved concrete crushed materials to remove impurities in the concrete crushed materials and improve the quality of the concrete crushed materials; Step 5: Finished product mixing: The washed concrete crushed materials are mixed with other concrete raw materials in a certain proportion to obtain recycled concrete.

2. A process for preparing recycled concrete based on construction solid waste according to claim 1, characterized in that: The crushing mechanism comprises a second shell (13), the top and bottom of the second shell (13) are both provided with a first opening, two symmetrically arranged crushing rollers (14) are placed inside the second shell (13), the two ends of the two crushing rollers (14) respectively penetrate the two symmetrical surfaces of the second shell (13) and extend to the outside, one end of the two crushing rollers (14) is fixedly sleeved with a gear (12), the two gears (12) are meshed, one end of one of the crushing rollers (14) is connected to a second drive motor (2), the housing of the second drive motor (2) is mounted on the outside of the second shell (13) through a motor bracket, and the bottom of the second shell (13) is connected to a steel bar fragment recovery mechanism.

3. A process for preparing recycled concrete based on construction solid waste according to claim 2, characterized in that: The steel bar fragment recovery mechanism comprises a first shell (4), the top of the first shell (4) is mounted on the bottom of the second shell (13), the top and bottom of the first shell (4) are both provided with a second opening, the first opening and the second opening are communicated, and the two ends of the first shell (4) are both provided with a third opening, the interior of the first shell (4) is connected with a filter screen (15) through a plurality of elastic mechanisms, the filter screen (15) and the inner cavity of the first shell (4) are matched and connected, an electromagnet (27) is arranged above the filter screen (15), a mounting plate (23) is mounted on the top of the electromagnet (27), an electric cylinder (26) is mounted on the top of the mounting plate (23), the outer shell of the electric cylinder (26) is mounted on the bottom of the connecting block (22), a ball screw (37) is installed through the side of the connecting block (22), and one end of the ball screw (37) is connected to a first driving motor (1).

4. The process for preparing recycled concrete based on construction solid waste according to claim 3, characterized in that: Both ends of the mounting plate (23) are mounted with fixed strip blocks (28), the side of the fixed strip block (28) is provided with a dovetail groove (38), a dovetail block (21) is slidably mounted inside the dovetail groove (38), a movable strip block (20) is mounted on the side of the dovetail block (21), and one end of the movable strip block (20) is mounted on the bottom of the connecting block (22).

5. The process for preparing recycled concrete based on construction solid waste according to claim 3, characterized in that: Second fixing rods (10) are installed through both ends of the connection block (22), and both ends of the two second fixing rods (10) pass through the third opening and extend to the outside, and second support rods (9) are installed at both ends of the two second fixing rods (10), and connecting rods (25) are installed at the bottom ends of the four second support rods (9), and one end of the four connecting rods (25) is respectively installed on two symmetrical side surfaces of the first shell (4).

6. A process for preparing recycled concrete based on construction solid waste according to claim 5, characterized in that: Two first fixing rods (6) are arranged inside the first shell (4), one end of the two first fixing rods (6) respectively passes through the two third openings and is installed on the side of the four second support rods (9), the side of the two first fixing rods (6) are both installed with a rack (18), the rack (18) is located inside the first shell (4), a meshing gear (24) is arranged below the rack (18), the side of the gear (24) is penetrated by a fixing shaft (29) arranged with the same central axis, one end of the fixing shaft (29) is installed with a cam (17), the other end of the fixing shaft (29) is movably sleeved with a fixing plate (31), the top of the fixing plate (31) is installed with a supporting plate (30), one end of the supporting plate (30) extends to one side of the first fixing rod (6), one end of the supporting plate (30) is installed with a sliding block (35), the side of the first fixing rod (6) is provided with a sliding groove (36), one end of the sliding block (35) extends to the inside of the sliding groove (36).

7. A process for preparing recycled concrete based on construction solid waste according to claim 6, characterized in that: A first extension plate (32) is installed at the bottom of the fixing plate (31), the first extension plate (32) is located below the mounting plate (23), a second extension plate (34) is installed at the top of the mounting plate (23), one end of the first extension plate (32) and the second extension plate (34) are located correspondingly, and a second telescopic rod (33) is installed between one end of the first extension plate (32) and the second extension plate (34).

8. The process for preparing recycled concrete based on construction solid waste according to claim 3, characterized in that: The elastic mechanism comprises a first telescopic rod (16), the bottom end of the first telescopic rod (16) is mounted on the inner bottom surface of the first shell (4), the top end of the first telescopic rod (16) is mounted with a fixing plate (8), the top of the fixing plate (8) is mounted on the bottom of the frame in the filter (15), and the surface of the first telescopic rod (16) is movably sleeved with a compression spring (19), and the two ends of the compression spring (19) are respectively mounted on the inner bottom surface of the first shell (4) and the bottom of the frame in the filter (15).

9. The process for preparing recycled concrete based on construction solid waste according to claim 5, characterized in that: Two steel bar fragment storage boxes (3) are provided on the outer side of the first shell (4), the two steel bar fragment storage boxes (3) are respectively located below the two third openings, and the two steel bar fragment storage boxes (3) are respectively installed on the top of the four connecting rods (25).

10. The process for preparing recycled concrete based on construction solid waste according to claim 9, characterized in that: The sides of the two steel bar fragment storage boxes (3) are both equipped with first support rods (7), the two first support rods (7) are both movably mounted on the two ends of the ball screw (37) through bearing sleeves, and a baffle (11) is installed between the top ends of the two first support rods (7).

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