Construction waste crushing and screening and recycled aggregate grading device

Abstract

The invention relates to the field of construction waste resourceful treatment equipment, and discloses a construction waste crushing and screening and recycled aggregate grading device which comprises a support, and a crusher is arranged at the top of the support; the discharge pipe is arranged at a discharge hole of the crusher; the first-stage box body is arranged at the bottom of the support, and the two sides of the first-stage box body are each provided with a second-stage box body; the screening frame body is arranged at the bottom of the crusher, two screening cavities are formed in the screening frame body, and a screen is arranged in each screening cavity; the screening frame with the two screening cavities is arranged below the crusher, and the two screening cavities are alternately located in the material receiving screening state and the material stopping screening state through the switching component, so that when one screening cavity receives aggregate, the other screening cavity can still continue to screen the entered aggregate, and the screening efficiency is improved. Therefore, the problems of local accumulation of the screen and insufficient screening caused by continuous feeding in the prior art are solved.

Description

Technical Field

[0001] This invention relates to the field of construction waste resource utilization equipment technology, specifically to a construction waste crushing, screening, and recycled aggregate grading device. Background Technology

[0002] In the process of recycling construction waste, it is usually necessary to first crush solid waste such as concrete blocks and bricks, and then separate the materials according to particle size through a screening mechanism to obtain recycled aggregates of different specifications. In existing construction waste processing equipment, the common arrangement is to set up a screening mechanism below the discharge end of the crusher, so that the crushed material falls directly into the screening mechanism for grading.

[0003] Existing screening methods mostly involve a single screening unit continuously receiving material discharged from the crusher and completing the screening operation during continuous feeding. Because the crusher discharge is continuous, a thick material layer easily forms on the screen surface under continuous feeding conditions. Large particles on the screen are not easily discharged in time, and some materials close to the screen aperture size do not have sufficient residence time, thus affecting the adequacy of screening and the grading effect of recycled aggregates.

[0004] Under the above structure, if the screening mechanism is paused for material feeding or the machine is stopped for cleaning to remove large particles from the screen, it will affect the continuous connection between crushing and screening operations and reduce processing efficiency. If large particles on the screen are not cleaned in time, they will obstruct and accumulate, interfering with the screening of subsequent materials. Therefore, existing construction waste crushing and screening devices still have the problems of insufficient screening under continuous feeding conditions and difficulty in balancing the removal of large particles from the screen with continuous operation. Summary of the Invention

[0005] To address the shortcomings of existing technologies, this invention provides a device for crushing, screening, and grading construction waste and recycled aggregates, aiming to alleviate the aforementioned problems to at least some extent.

[0006] The above-mentioned technical objective of the present invention is achieved through the following technical solution: A device for crushing, screening, and grading construction waste and recycled aggregates includes: A support frame, with a crusher mounted on top of the support frame; The discharge pipe is located at the discharge port of the crusher; A primary housing is located at the bottom of the support, and a secondary housing is provided on each side of the primary housing; A screening frame is located at the bottom of the crusher, and two screening chambers are opened in the screening frame, each of which is equipped with a screen. A switching component located between the support and the screening frame is used to drive the screening frame to move, so that the two screening chambers alternately move to the position corresponding to the discharge pipe and alternately receive the aggregate discharged from the discharge pipe. A vibration component installed on the screening frame is used to apply vibration to the screening frame.

[0007] Preferably, the vibrating component includes a vibrator disposed at the bottom of the screening frame.

[0008] Preferably, the switching component includes a lead screw rotatably connected to the bracket, a slider threadedly connected to the bracket and engaged with the lead screw, and the screening frame is disposed on the slider.

[0009] Preferably, the bracket is equipped with a motor, and the output shaft of the motor is connected to the lead screw drive.

[0010] Preferably, a connecting strip is connected to the screening frame, the connecting strip is slidably connected to the slider, and a spring is connected between the connecting strip and the slider.

[0011] Preferably, the two screening chambers alternately operate in a receiving screening state and a stopped screening state. The screening chamber in the receiving screening state is used to receive aggregate and perform screening. The screening chamber in the stopped screening state is used to continue screening for a predetermined time after stopping receiving aggregate, and then switches to the discharge state after the predetermined time. Small aggregate particles fall into the primary box, and large aggregate particles are discharged to the secondary box on the corresponding side.

[0012] Preferably, a first rotating shaft is rotatably connected to the top of the screening frame, a baffle is connected to the first rotating shaft, the baffle extends into the screening chamber, and a second rotating shaft is rotatably connected to the end of the screening frame, with the screen fixed to the second rotating shaft.

[0013] Preferably, a push rod is provided on the second rotating shaft, and a hydraulic cylinder is rotatably connected to the screening frame, with the telescopic shaft of the hydraulic cylinder rotatably connected to the push rod.

[0014] Preferably, a gear is connected to the end of the first rotating shaft, and a rack that meshes with the gear is provided on the top of the screening frame.

[0015] Preferably, a connecting ring is fixed to the outer wall of the second rotating shaft, and a limiting groove is formed on the outer wall of the connecting ring. The push rod is rotatably fitted onto the connecting ring, and a limiting block is fixed to the inner wall of the push rod, which slides with the limiting groove. A connecting rod is connected to the push rod, and the other end of the connecting rod is connected to the rack.

[0016] In summary, the present invention has the following main beneficial effects: Compared with existing technologies, this application provides a screening frame with two screening chambers below the crusher. A switching mechanism allows the two chambers to alternate between receiving and stopping screening states. This ensures that while one chamber receives aggregate, the other continues screening the already-entered aggregate, avoiding the problems of localized screen accumulation and insufficient screening caused by continuous feeding in existing technologies. Furthermore, by switching to discharge mode after stopping screening, large aggregate particles trapped on the screen can be discharged into the corresponding secondary chamber, completing the discharge without affecting the continued receiving of the other screening chamber. This balances continuous operation and grading effectiveness, improving the stability of recycled aggregate screening and grading. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 This is a schematic diagram of the support structure of the present invention; Figure 3 This is a schematic diagram of the screening frame structure of the present invention; Figure 4 This is another schematic diagram of the screening frame structure of the present invention; Figure 5 This is another schematic diagram of the screening frame structure of the present invention; Figure 6 This is a cross-sectional schematic diagram of the screening frame structure of the present invention; Figure 7 This is a schematic diagram of the push rod structure of the present invention; Figure 8 This is a cross-sectional schematic diagram of the push rod structure of the present invention.

[0018] Figure label: 100. Support frame; 101. Crusher; 102. Discharge pipe; 103. Primary housing; 104. Secondary housing; 105. Screening frame; 106. Screening chamber; 107. Screen; 108. Vibrator; 200. Lead screw; 201. Slider; 202. Motor; 203. Connecting bar; 204. Spring; 300, First rotating shaft; 301, baffle; 302, Second rotating shaft; 303, push rod; 304, hydraulic cylinder; 305, gear; 306, rack; 400. Connecting ring; 401. Limiting groove; 402. Limiting block; 403. Connecting rod. Detailed Implementation

[0019] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0020] refer to Figures 1-8 A construction waste crushing, screening, and recycled aggregate grading device includes a support 100, with a crusher 101 mounted on top of the support 100. The crusher 101 is a conventional crushing device, and its specific structure and working principle will not be described in detail here. The crusher 101 is used to crush the construction waste entering the device, so as to crush the large-volume construction waste into aggregates suitable for subsequent screening and grading.

[0021] The bottom of the support 100 is provided with a primary box 103, and a secondary box 104 is provided on each side of the primary box 103. The primary box 103 is used to receive small aggregate particles after screening, and the two secondary boxes 104 are used to receive larger aggregate particles discharged through the corresponding screening chambers 106, thereby realizing the graded collection of aggregates of different particle sizes.

[0022] The support 100 is equipped with a screening frame 105 located at the bottom of the crusher 101. The screening frame 105 has two screening chambers 106, each equipped with a screen 107. The two screening chambers 106 are used as alternating screening units. At any given time, one screening chamber 106 moves to a position corresponding to the discharge pipe 102 to receive aggregate discharged from the discharge pipe 102, while the other screening chamber 106 moves away from directly below the discharge pipe 102 and no longer receives new aggregate. A switching component is provided between the support 100 and the screening frame 105. This switching component drives the screening frame 105 to move, causing the two screening chambers 106 to alternately move to positions corresponding to the discharge pipe 102 and alternately receive aggregate. The screening frame 105 is provided with a vibration component, which is used to apply vibration to the screening frame 105 so that the aggregate entering the screening chamber 106 is vibrated and dispersed on the screen 107, and the aggregate smaller than the aperture of the screen 107 passes downward through the screen 107, while the aggregate larger than the aperture of the screen 107 is retained in the corresponding screening chamber 106.

[0023] The two screening chambers 106 can alternate between receiving screening and stopping screening. When one of the screening chambers 106 is located below the discharge pipe 102, the screening chamber 106 is in the receiving screening state. The aggregate discharged from the discharge pipe 102 enters the screening chamber 106 and is screened on the screen 107 under the action of the vibrating component. Small aggregate particles fall into the primary box 103 below after passing through the screen 107, while large aggregate particles are intercepted by the screen 107 and remain in the screening chamber 106. Meanwhile, another screening chamber 106 is in a stopped screening state. Although this screening chamber 106 no longer receives new aggregate, it continues to screen under the action of the vibrating component. This allows small aggregate particles that were originally in the screening chamber 106 and whose particle size is close to the aperture of the screen 107 to continue to fall into the primary box 103 through the screen 107, thereby improving the sufficiency of screening and reducing the impact of excessively thick material layer caused by continuous feeding on the screening effect.

[0024] After the receiving screening chamber 106 completes its current stage of receiving work, the switching component drives the screening frame 105 to move, causing another screening chamber 106 to move to the position corresponding to the discharge pipe 102 and enter the receiving screening state. The original receiving screening chamber 106 then switches to the stopped screening state. After the stopped screening chamber 106 continues screening for a predetermined time, it switches to the discharge state. In this state, large aggregate particles intercepted and retained by the screen 107 in the screening chamber 106 are discharged and enter the corresponding secondary box 104 to complete the separate collection of larger aggregate particles. Since the primary box 103 is located below the screening frame 105, and the two secondary boxes 104 are respectively located on both sides of the primary box 103, small aggregate particles and large aggregate particles can enter different boxes respectively, thereby completing particle size classification.

[0025] Furthermore, when the screening frame 105 moves below the discharge pipe 102 to receive aggregate, the drop position of the discharge pipe 102 corresponding to the screen 107 will change with the displacement of the screening frame 105. This prevents the aggregate from continuously falling into the same area of ​​the screen 107 during the receiving process, but instead disperses and falls along different areas of the screen 107. This reduces the concentrated accumulation of aggregate in local areas of the screen 107, reduces the impact of excessively thick local material layers on screening, and helps to improve the uniformity of aggregate distribution and the sufficiency of screening.

[0026] Based on the above embodiments, the vibration component includes a vibrator 108 located at the bottom of the screening frame 105, used to provide vibration excitation to the screening frame 105. During operation, the vibrator 108 drives the entire screening frame 105 to vibrate, causing the aggregate entering the two screening chambers 106 to disperse, tumble, and jump on the corresponding screens 107. This facilitates the timely passage of smaller aggregates through the screens 107 into the primary housing 103, while retaining larger aggregates within the corresponding screening chambers 106. By placing the vibrator 108 at the bottom of the screening frame 105, it is convenient to directly apply vibration force to the screening frame 105, ensuring stable screening even after the screening frame 105 completes position switching under the drive of the switching component. This improves the sufficiency and grading effect of aggregate screening.

[0027] Based on the above embodiment, the switching component includes a lead screw 200 rotatably connected to a support 100, a slider 201 threadedly connected to the support 100 and engaged with the lead screw 200, and a screening frame 105 disposed on the slider 201. The lead screw 200 is arranged along the switching direction of the screening frame 105, and the slider 201 can only slide in a predetermined direction on the support 100. When the lead screw 200 rotates, the slider 201 moves linearly along the support 100 under the threaded transmission of the lead screw 200, and drives the screening frame 105 to move synchronously, thereby causing the two screening chambers 106 in the screening frame 105 to alternately move to the position corresponding to the discharge pipe 102. By adopting the engagement method of the lead screw 200 and the slider 201, it is easy to convert the rotational motion of the lead screw 200 into the linear displacement of the screening frame 105, so as to achieve stable switching between the two screening chambers 106.

[0028] Based on the above embodiment, a motor 202 is provided on the support 100, and the output shaft of the motor 202 is connected to the lead screw 200 for transmission. The motor 202 is mounted on the support 100 and is correspondingly set to the input end of the lead screw 200. The rotational power output by the output shaft of the motor 202 is transmitted to the lead screw 200 to drive the lead screw 200 to rotate around its own axis. Since the slider 201 is threadedly engaged with the lead screw 200, when the lead screw 200 rotates, the slider 201 can be displaced along the sliding direction of the support 100, and drive the screening frame 105 provided on the slider 201 to move synchronously, thereby realizing the position switching of the two screening chambers 106 relative to the discharge pipe 102.

[0029] Based on the above embodiment, a connecting strip 203 is connected to the screening frame 105. The connecting strip 203 is slidably connected to the slider 201, and a spring 204 is connected between the connecting strip 203 and the slider 201. The connecting strip 203 is fixedly connected to the screening frame 105 so as to move synchronously with the screening frame 105. The slider 201 provides guidance and support for the connecting strip 203, allowing the connecting strip 203 to slide relative to the slider 201 in a predetermined direction. The spring 204 is connected between the connecting strip 203 and the slider 201 to form an elastic connection between the screening frame 105 and the slider 201. Thus, the screening frame 105 is not rigidly fixed to the slider 201, but rather forms a relatively movable connection structure through the connecting strip 203, the slider 201, and the spring 204.

[0030] When the vibrator 108 applies vibration to the screening frame 105, the screening frame 105 drives the connecting bar 203 to reciprocate relative to the slider 201. During this process, the spring 204 is compressed and rebounded, thus providing elastic support for the vibration of the screening frame 105, allowing the screening frame 105 to maintain a vibrating screening state on the slider 201. When the motor 202 drives the lead screw 200 to rotate and drives the slider 201 to slide along the support 100, the slider 201 can then drive the screening frame 105 to move as a whole through the connecting bar 203, so that the two screening chambers 106 alternately move to the position corresponding to the discharge pipe 102. That is, the arrangement of the connecting bar 203 and the spring 204 allows the screening frame 105 to maintain the required movement stroke relative to the slider 201 while switching movements with the slider 201.

[0031] Based on the above embodiment, a first rotating shaft 300 is rotatably connected to the top of the screening frame 105, and a baffle 301 is connected to the first rotating shaft 300. The baffle 301 extends into the corresponding screening chamber 106 to seal the side of the screening chamber 106. A second rotating shaft 302 is rotatably connected to the end of the screening frame 105, and the screen 107 is fixed to the second rotating shaft 302 so that the screen 107 can rotate around the second rotating shaft 302. Through the coordinated arrangement of the first rotating shaft 300, the baffle 301, the second rotating shaft 302, and the screen 107, the screening chamber 106 remains sealed under normal material receiving and screening conditions, and when large aggregate particles need to be released, the side opening and the screen 107 tilting for material discharge are completed sequentially.

[0032] In practical use, after the corresponding screening chamber 106 completes the stopping screening and reaches the predetermined release condition, the first rotating shaft 300 is driven to rotate, thereby causing the baffle 301 to rotate around the first rotating shaft 300 and open the side of the screening chamber 106 that was originally blocked by the baffle 301, thus forming a release channel for the discharge of large aggregate particles on the side of the screening chamber 106. After the baffle 301 is opened, the second rotating shaft 302 is driven to rotate, causing the screen 107 fixed on the second rotating shaft 302 to tilt. Since the screen 107 carries large aggregate particles that failed to pass through the screen holes during the previous screening process, as the screen 107 tilts to the open side, the large aggregate particles remaining on the screen 107 slide out along the tilting direction of the screen 107 under its own gravity and are discharged through the open side of the screening chamber 106. Therefore, large aggregate particles in the screening chamber 106 can be smoothly released into the secondary box 104 after the screening is completed, while small aggregate particles that have passed through the screen 107 fall into the primary box 103 below during the screening process, thereby achieving graded output of large and small aggregate particles.

[0033] Based on the above embodiment, a push rod 303 is provided on the second rotating shaft 302, and a hydraulic cylinder 304 is rotatably connected to the screening frame 105. The piston rod of the hydraulic cylinder 304 is rotatably connected to the push rod 303. Specifically, the hydraulic cylinder 304 is mounted on the screening frame 105 and can rotate relative to the screening frame 105. The push rod 303 is connected to the second rotating shaft 302 and rotates synchronously with the second rotating shaft 302. The end of the piston rod of the hydraulic cylinder 304 is rotatably connected to the push rod 303 to transmit the extension and retraction action of the hydraulic cylinder 304 to the push rod 303. Thus, when the hydraulic cylinder 304 is activated, the piston rod pushes or pulls the push rod 303 to swing, and the push rod 303 then drives the second rotating shaft 302 to rotate, thereby causing the screen 107 fixed on the second rotating shaft 302 to rotate.

[0034] Based on the above embodiment, a gear 305 is connected to the end of the first rotating shaft 300, and a rack 306 meshing with the gear 305 is provided on the top of the screening frame 105. The gear 305 is fixedly connected to the first rotating shaft 300. Through the meshing transmission relationship between the rack 306 and the gear 305, the rack 306 can drive the gear 305 to rotate when it is displaced. The gear 305 then drives the first rotating shaft 300 to rotate, thereby causing the baffle 301 connected to the first rotating shaft 300 to rotate synchronously, so as to open or close the side of the screening chamber 106.

[0035] In practical use, when the corresponding screening chamber 106 completes the material stopping screening and needs to release large aggregate particles, the rack 306 is first moved in a predetermined direction. During the displacement, the rack 306 drives the gear 305 meshing with it to rotate. The gear 305 then drives the first rotating shaft 300 to rotate, causing the baffle 301 to rotate open from the side of the screening chamber 106, thus opening the side of the screening chamber 106 first. After the baffle 301 rotates to the predetermined opening position, the second rotating shaft 302 is driven to rotate, causing the screen 107 fixed on the second rotating shaft 302 to tilt towards the opened side. The large aggregate particles remaining on the screen 107 slide out along the tilt direction under their own gravity and are discharged into the corresponding secondary box 104 through the opened side of the screening chamber 106. After the large aggregate particles are discharged, the second rotating shaft 302 rotates in the opposite direction to drive the screen 107 to reset, and the rack 306 moves in the opposite direction to drive the first rotating shaft 300 to rotate in the opposite direction, so that the baffle 301 rotates back to the blocking position, thereby restoring the corresponding screening chamber 106 to the closed state required for subsequent material receiving and screening.

[0036] Based on the above embodiment, a connecting ring 400 is fixed to the outer wall of the second rotating shaft 302. A limiting groove 401 is formed on the outer wall of the connecting ring 400. The push rod 303 is rotatably fitted onto the connecting ring 400. A limiting block 402, which slides with the limiting groove 401, is fixed to the inner wall of the push rod 303. A connecting rod 403 is connected to the push rod 303, and the other end of the connecting rod 403 is connected to the rack 306. Thus, during rotation, the push rod 303 can, on the one hand, drive the rack 306 to move via the connecting rod 403, and on the other hand, under the cooperation of the limiting block 402 and the limiting groove 401, form a predetermined relative rotational stroke with the connecting ring 400.

[0037] In practical use, when it is necessary to release large aggregate particles from the screening chamber 106, the piston rod of the hydraulic cylinder 304 extends to push the push rod 303 to rotate. In the initial stage of the push rod 303 rotation, the limiting block 402 on the push rod 303 slides in the limiting groove 401 of the connecting ring 400. At this time, the push rod 303 does not immediately drive the connecting ring 400 and the second rotating shaft 302 to rotate. Instead, it first drives the rack 306 to move through the connecting rod 403. The rack 306 then drives the gear 305 meshing with it to rotate, which in turn drives the first rotating shaft 300 to rotate, so that the baffle 301 rotates open first to open the side of the screening chamber 106. As the piston rod of the hydraulic cylinder 304 continues to extend, the limiting block 402 slides to the limiting position of the limiting groove 401, and the relative rotation between the push rod 303 and the connecting ring 400 ends. When the push rod 303 continues to rotate, it drives the connecting ring 400 and the second rotating shaft 302 to rotate synchronously, so that the screen 107 fixed on the second rotating shaft 302 tilts towards the opened side, so that the large aggregate particles left on the screen 107 slide out along the tilting direction and are discharged into the secondary box 104 on the corresponding side through the side of the opened screening chamber 106.

[0038] Through the cooperation of the connecting ring 400, limiting groove 401, limiting block 402, connecting rod 403, and rack 306, when the push rod 303 moves, it first drives the rack 306 to move, thereby driving the baffle 301 to open. Then, it drives the second rotating shaft 302 to rotate, causing the screen 107 to tilt. This creates a release channel on the side of the screening chamber 106, allowing large aggregate particles on the screen 107 to be discharged along the tilt direction. This avoids the problems of large aggregate particles slipping prematurely and causing accumulation, pressure, and jamming when the side is not open or not fully open. It improves the smoothness of large aggregate discharge, the stability of the action coordination, and the reliability of subsequent screening after the screening chamber 106 is reset.

[0039] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A device for crushing, screening, and grading construction waste and recycled aggregates, characterized in that, include: A support frame (100) is provided, with a crusher (101) on top; a discharge pipe (102) is provided at the discharge port of the crusher (101); a primary housing (103) is provided at the bottom of the support frame (100), with a secondary housing (104) provided on each side of the primary housing (103); a screening frame (105) is provided at the bottom of the crusher (101), with two screening chambers (106) provided inside the screening frame (105), each of which... Each screening chamber (106) is equipped with a screen (107); a switching component located between the support (100) and the screening frame (105) is used to drive the screening frame (105) to move so that the two screening chambers (106) alternately move to the position corresponding to the discharge pipe (102) and alternately receive the aggregate discharged from the discharge pipe (102); a vibration component located on the screening frame (105) is used to apply vibration to the screening frame (105).

2. The construction waste crushing, screening, and recycled aggregate grading device according to claim 1, characterized in that, The vibrating component includes an exciter (108) located at the bottom of the screening frame (105).

3. The construction waste crushing, screening, and recycled aggregate grading device according to claim 1, characterized in that, The switching component includes a lead screw (200) rotatably connected to the bracket (100), a slider (201) slidably connected to the bracket (100) and threadedly engaged with the lead screw (200), and a screening frame (105) disposed on the slider (201).

4. The construction waste crushing, screening, and recycled aggregate grading device according to claim 3, characterized in that, The bracket (100) is equipped with a motor (202), and the output shaft of the motor (202) is connected to the lead screw (200) for transmission.

5. A construction waste crushing, screening, and recycled aggregate grading device according to claim 3, characterized in that, A connecting strip (203) is connected to the screening frame (105). The connecting strip (203) is slidably connected to the slider (201), and a spring (204) is connected between the connecting strip (203) and the slider (201).

6. The construction waste crushing, screening, and recycled aggregate grading device according to claim 1, characterized in that, The two screening chambers (106) alternate between receiving screening and stopping screening. The screening chamber (106) in receiving screening is used to receive aggregate and screen it. The screening chamber (106) in stopping screening is used to continue screening for a predetermined time after stopping receiving aggregate, and then switches to discharge screening after the predetermined time. Small aggregate particles fall into the primary box (103), and large aggregate particles are discharged to the secondary box (104) on the corresponding side.

7. A construction waste crushing, screening, and recycled aggregate grading device according to claim 6, characterized in that, The top of the screening frame (105) is rotatably connected to a first rotating shaft (300), and a baffle (301) is connected to the first rotating shaft (300). The baffle (301) extends into the screening chamber (106). The end of the screening frame (105) is rotatably connected to a second rotating shaft (302), and the screen (107) is fixed on the second rotating shaft (302).

8. The construction waste crushing, screening, and recycled aggregate grading device according to claim 7, characterized in that, The second rotating shaft (302) is provided with a push rod (303), and the screening frame (105) is rotatably connected with a hydraulic cylinder (304). The telescopic shaft of the hydraulic cylinder (304) is rotatably connected with the push rod (303).

9. A construction waste crushing, screening, and recycled aggregate grading device according to claim 8, characterized in that, The end of the first rotating shaft (300) is connected to a gear (305), and the top of the screening frame (105) is provided with a rack (306) that meshes with the gear (305).

10. A construction waste crushing, screening, and recycled aggregate grading device according to claim 9, characterized in that, A connecting ring (400) is fixed on the outer wall of the second rotating shaft (302). A limiting groove (401) is formed on the outer wall of the connecting ring (400). The push rod (303) is rotatably fitted on the connecting ring (400). A limiting block (402) is fixed on the inner wall of the push rod (303) and slides with the limiting groove (401). A connecting rod (403) is connected to the push rod (303). The other end of the connecting rod (403) is connected to the rack (306).

Images