Recycled concrete crushing and screening synergistic equipment based on particle size feedback adjustment

Abstract

This invention discloses a recycled concrete crushing and screening co-processing device based on particle size feedback adjustment, which relates to the field of concrete screening technology. This device utilizes a coaxially driven, synchronously driven knocking and cleaning structure in the crushing stage to remove the mixture of fine sand and cement powder adhering to the aggregate surface at the source. The compliant aggregate, after screening, will be reused and used in proportion with sand, cement, and other auxiliary materials. If a large amount of fine sand and lime adheres to the aggregate surface, it will affect the accurate proportioning of subsequent auxiliary materials, further reducing the risk of clumping fine powder and clogging the screen holes, thus reducing the material throughput area. Through a buffer-rebound follow-up structure, the impact potential energy of the falling material is converted into the vertical throwing kinetic energy of the screen, removing flaky, strip-shaped aggregates and fine sand and lime stuck in the screen holes online, thereby reducing the incidence of rigid blockage from the source.

Description

Technical Field

[0001] This invention relates to the field of concrete screening technology, specifically to a recycled concrete crushing and screening co-processing device based on particle size feedback adjustment. Background Technology

[0002] The recycled concrete crushing and screening collaborative equipment based on particle size feedback adjustment is an intelligent complete set of equipment for the resource utilization of waste concrete, integrating collaborative control. It is a process equipment for preparing high-quality recycled aggregates from construction solid waste, realizing spatial integration and temporal coordination of crushing and screening processes, avoiding production waste and quality fluctuations caused by process disconnection. The control system of particle size detection, data feedback, and parameter adjustment acquires core data such as particle size distribution, gradation curve, and needle-like and flaky proportion of finished aggregates in real time through online detection units, and dynamically adjusts key operating parameters of crushing and screening processes in reverse, ultimately achieving high-precision and high-stability control of recycled aggregate particle size. It can meet the stringent requirements of different strength grades of recycled concrete for aggregate gradation.

[0003] With the acceleration of urbanization and the continuous development of the construction industry, the resource utilization of waste concrete has become the core path for the reduction and high-value disposal of construction solid waste. Crushing and screening are the two core processes in the preparation of recycled aggregates. In existing technologies, metal screens are mostly used as screening execution components to classify the particle size of the crushed recycled concrete aggregates, screen out oversized aggregates and separate finished aggregates that meet the gradation requirements. At the same time, the oversized aggregates are returned to the crushing unit for secondary crushing, thereby realizing the continuous preparation of recycled aggregates. In actual continuous production, recycled concrete aggregates after crushing have the inherent characteristic of irregular particle shape, which easily produces a large number of flaky and strip-shaped irregular aggregates. At the same time, the surface of the aggregates is often covered with a mixture of hardened cement, fine sand and cement stone powder, as well as sand and lime clumps (which increase the internal friction between them, leading to material adhesion during the feeding process). During the screening operation, irregular aggregates are easy to get stuck in the screen holes of the metal screen, forming rigid blockages. The resulting mixed bulk will stick to the inner wall of the screen holes, further reducing the effective material passing area of ​​the screen holes and aggravating the blockage trend. This causes the effective screening area of ​​the screen to continue to shrink, the aggregate screening rate to decrease, and the screen hole blockage will directly destroy the aggregate grading path and cause the particle size classification to be disordered. Therefore, the recycled concrete crushing and screening collaborative equipment based on particle size feedback adjustment proposed in this application aims to achieve online dynamic handling of screen clogging problems and precise control of aggregate gradation, ensuring the continuous and stable operation of the recycled aggregate preparation production line and the high-quality output of finished aggregates. Summary of the Invention

[0004] The purpose of this invention is to provide a recycled concrete crushing and screening collaborative device based on particle size feedback adjustment, which solves the problem of continuously and dynamically handling blockages and controlling the screening rate during the concrete screening process.

[0005] To achieve this objective, the present invention adopts the following technical solution: A recycled concrete crushing and screening co-processing device based on particle size feedback adjustment includes a base, an angle control mechanism installed on the top of the base, a screening frame installed on the top of the angle control mechanism, a feed inlet on one side above the screening frame, an opening at one lateral end of the screening frame away from the feed inlet, and a crushing component installed on the top of the base corresponding to the position of the feed inlet. The top of the screening frame is equipped with a visual monitoring device. Several limiting grooves are evenly opened on the two opposite inner side walls of the screening frame. A buffer is installed on the inner wall of each limiting groove. A return spring is sleeved on the outer wall of each buffer. A limiting seat that slides in the inner wall of the limiting groove is installed at the top of each buffer. The limiting seats on the same side are all fixedly installed with the same slide rail. A mounting seat is slidably installed on the inner wall of each slide rail. A screening screen is installed between the mounting seats. A vibration motor is built into the bottom of the screening frame.

[0006] Furthermore, the angle control mechanism includes two fixed seats fixedly installed on the base, two guide shafts installed between the fixed seats, and an adjustment platform slidably installed between the guide shafts. A control push rod is fixedly installed on the side of one of the fixed seats away from the adjustment platform, and the movable end of the control push rod slides through the fixed seat and is fixedly connected to one side of the adjustment platform.

[0007] Furthermore, several adjustment frames are rotatably mounted on the top of the adjustment platform. The top of each adjustment frame is hinged to the bottom of the screening frame via a hinge seat. A self-locking telescopic rod is hinged to the outer wall of each adjustment frame, and the top of each self-locking telescopic rod is hinged to the bottom of the screening frame.

[0008] Furthermore, a support frame is fixedly installed on the side of the base near the opening, a control shaft is fixedly installed on the top of the support frame, and U-shaped seats are rotatably installed at both ends of the control shaft. The top of the U-shaped seats is fixedly connected to the bottom wall of the screening frame, and angle sensors are installed on the outer wall of the U-shaped seats.

[0009] Furthermore, the crushing assembly includes a vertical frame fixedly installed on the base near the feed inlet. The vertical frame is equipped with a crushing box. A feed hopper is connected to the top of the crushing box, and a discharge hopper is connected to the bottom of the crushing box. The discharge end of the discharge hopper is located in a position that matches the feed inlet of the screening frame.

[0010] Furthermore, a crushing mechanism is installed on the inner wall of the crushing box, and a striking mechanism is connected to the crushing box. The crushing mechanism includes two crushing rollers rotatably installed on the inner wall of the crushing box. The two crushing rollers mesh with each other. One end of the roller shaft of each crushing roller passes through the crushing box and is fixedly installed with a transmission gear. The two transmission gears mesh with each other. A drive motor is installed on the outer wall of the crushing box on the side away from the transmission gear. The power shaft of the drive motor passes through the crushing box and is fixedly connected to one of the crushing roller shafts.

[0011] Furthermore, the striking mechanism includes positioning frames fixedly installed at both ends of the outer wall of the crushing box in the horizontal direction. Each positioning frame is provided with a cross groove, and a cross block is slidably installed in each cross groove. The same connecting rod is fixedly installed between two cross blocks on the same side. Several movable seats are evenly installed on the connecting rod, and a striking hammer is fixedly installed on the side of each movable seat facing the crushing box.

[0012] Furthermore, an adjusting arm is rotatably mounted on the cross block near the transmission gear, and one end of the adjusting arm is rotatably connected to the outer wall of the transmission gear.

[0013] Furthermore, a discharge frame is fixedly installed on the end of the screening frame and the screening screen near the opening. A heightening baffle is installed on the top of the discharge frame. A guide seat is fixedly installed on the discharge frame. A discharge port is connected to the discharge frame. The discharge ports located at the upper and lower parts have opposite discharge directions.

[0014] Compared with the prior art, the present invention has the following beneficial effects: 1. This recycled concrete crushing and screening co-processing equipment based on particle size feedback adjustment uses a coaxially driven, synchronously driven knocking and cleaning structure in the crushing stage to remove the mixture of fine sand and cement powder adhering to the surface of the aggregate from the source. The compliant aggregate will be reused after screening and used in proportion with sand, cement and other auxiliary materials. If a large amount of fine sand and lime adheres to the surface of the aggregate, it will affect the accurate proportion of subsequent auxiliary materials, further reducing the hidden danger of clumping fine powder blocking the screen holes and reducing the material passing area. Through a buffer rebound follow-up structure, the impact potential energy of the falling material is converted into the vertical throwing kinetic energy of the screen, and the flaky, strip-shaped aggregate and fine sand and lime stuck in the screen holes are removed online, reducing the occurrence rate of rigid blockage from the root. With the help of visual monitoring equipment to identify and predict the working condition of the screen surface in real time, the effective screening area of ​​the screen can be quickly restored by coordinating the adjustment of vibration parameters and screening elevation angle without stopping the machine, and the problem of uncontrolled finished product gradation caused by the mixing of aggregates of different particle sizes is eliminated.

[0015] 2. This recycled concrete crushing and screening co-processing equipment based on particle size feedback adjustment uses a closed-loop control system linked with an angle sensor and a control push rod to achieve continuous and precise adjustment of the screening elevation angle, ensuring the long-term stability of screening process parameters. The main drive of the crushing roller synchronously drives the knocking and cleaning mechanism, enabling real-time cleaning of material adhering to the inner wall of the crushing chamber. Combined with real-time data feedback from the visual monitoring system, it can synchronously adjust the screening vibration parameters and screen elevation angle according to dynamic changes in raw material characteristics and screen clogging conditions, achieving full-process coordinated adaptation of the crushing and screening processes and ensuring stable operation of the equipment under different raw materials and load conditions.

[0016] 3. This recycled concrete crushing and screening collaborative equipment based on particle size feedback adjustment strictly isolates the graded discharge paths of qualified aggregates and oversized aggregates through the heightened baffle structure on both sides of the discharge frame. This completely eliminates the ineffective repeated crushing caused by qualified aggregates being returned to the crushing unit along with oversized aggregates. Through graded emergency control logic, when the screen shows signs of clogging, the screening capacity is restored first by adjusting vibration and elevation angle without excessively increasing the crushing intensity. This reduces the problem of over-crushing aggregates from the root. Combined with precise grading control throughout the process, it can ensure that the particle size distribution and gradation curve of the finished aggregate always stably meet the preset standards, and the quality of the finished product can meet the requirements of recycled concrete for aggregates. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0018] The structures, proportions, sizes, etc., shown in the accompanying drawings of this specification are only for the purpose of assisting those skilled in the art in understanding and reading the content disclosed in the specification, and are not intended to limit the conditions under which the present invention can be implemented. Therefore, they have no substantial technical significance. Any modifications to the structure, changes in the proportions, or adjustments to the size, without affecting the effects and objectives that the present invention can produce, should still fall within the scope of the technical content disclosed in the present invention.

[0019] Figure 1 This is a schematic diagram of the external structure of the present invention. Figure 1 ; Figure 2 This is a schematic diagram of the external structure of the present invention. Figure 2 ; Figure 3 This is a schematic diagram of the combination of the base, angle control mechanism, and screening frame of the present invention; Figure 4This is a schematic diagram of the external structure of the angle control mechanism of the present invention. Figure 1 ; Figure 5 This is a schematic diagram of the external structure of the angle control mechanism of the present invention. Figure 2 ; Figure 6 This is an exploded view of the internal structure of the screening frame, slide rail, and screening screen of the present invention; Figure 7 This is an exploded view of the internal structure of the slide rail, mounting base, and screening screen of the present invention; Figure 8 This is a cross-sectional view of the internal structure of the screening frame of the present invention; Figure 9 This is a cross-sectional view of the screening frame, slide rail, and screening screen of the present invention; Figure 10 This is a combined diagram of the discharge frame, discharge port, guide seat, and heightening baffle of the present invention; Figure 11 For the present invention Figure 8 Enlarged view of the structure at point A; Figure 12 This is a schematic diagram of the external structure of the crushing component of the present invention; Figure 13 This invention comprises a crushing box, a feed hopper, a discharge hopper, and a striking mechanism. Figure 1 ; Figure 14 This invention comprises a crushing box, a feed hopper, a discharge hopper, and a striking mechanism. Figure 2 ; Figure 15 This is a schematic diagram of the combination of the crushing mechanism and the striking mechanism of the present invention; Figure 16 This is an exploded view of the internal structure of the striking mechanism of the present invention; Figure 17 This is a cross-sectional view of the internal structure of the crushing box, feed hopper, and discharge hopper of the present invention.

[0020] Illustrations: 1. Base; 2. Angle control mechanism; 21. Fixed seat; 22. Control push rod; 23. Guide shaft; 24. Adjusting platform; 25. Adjusting frame; 26. Self-locking telescopic rod; 27. Support frame; 28. Angle sensor; 29. ​​Control shaft; 210. U-shaped seat; 3. Crushing assembly; 31. Vertical frame; 32. Crushing box; 33. Feed hopper; 34. Discharge hopper; 35. Striking mechanism; 351. Adjusting arm; 352. Cross groove; 353. Positioning frame; 354, cross block; 355, connecting rod; 356, movable seat; 357, hammer; 36, crushing mechanism; 361, drive motor; 362, crushing roller; 363, transmission gear; 4, heightening baffle; 5, screening frame; 6, visual monitoring equipment; 7, slide rail; 8, mounting base; 9, screening screen; 10, limiting groove; 11, limiting seat; 12, buffer; 13, return spring; 14, discharge frame; 15, discharge port; 16, guide seat. Detailed Implementation

[0021] To make the objectives, features, and advantages of this invention more apparent and understandable, the technical solutions of the embodiments of this invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the embodiments described below are only some embodiments of this invention, and not all embodiments. Based on the embodiments of this invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this invention.

[0022] In the description of this invention, it should be understood that the terms "upper," "lower," "top," "bottom," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing the invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the invention. It should be noted that when a component is considered to be "connected" to another component, it can be directly connected to the other component or there may be a component positioned centrally in the connection.

[0023] The technical solution of the present invention will be further described below with reference to the accompanying drawings and specific embodiments.

[0024] Please see Figures 1-17 This invention provides a recycled concrete crushing and screening collaborative device based on particle size feedback adjustment, including a base 1, an angle control mechanism 2 installed on the top of the base 1, a screening frame 5 installed on the top of the angle control mechanism 2, which can control the screening frame 5 to adjust the screening angle, a feed inlet is provided on one side above the screening frame 5, and the screening frame 5 is open at one side away from the feed inlet. A crushing component 3 for crushing concrete is installed on the top left side of the base 1. The top of the screening frame 5 is equipped with a visual monitoring device 6 for monitoring the screening rate of concrete. Several limiting grooves 10 are evenly opened on the two opposite inner side walls of the screening frame 5. Buffers 12 are installed on the inner walls of the limiting grooves 10. Return springs 13 are sleeved on the outer walls of the buffers 12. Limiting seats 11 that slide in the inner walls of the limiting grooves 10 are installed at the top of the buffers 12. The same slide rail 7 is fixedly installed on the outer walls of the limiting seats 11 on the same side. Mounting seats 8 are slidably installed on the inner walls of the slide rails 7. Screening mesh 9 is installed between the mounting seats 8. A vibration motor is built into the bottom of the screening frame 5.

[0025] In this implementation plan, the base 1 provides a stable and rigid installation foundation for the entire set of equipment. The crushing component 3, the angle control mechanism 2, and the screening frame 5 are arranged in a vertically connected layout, so that the crushed material falls directly into the screening frame 5 by gravity. This eliminates the intermediate conveying link, shortens the material transmission path, and avoids the material from scattering and dust from overflowing during the material transfer process. The visual monitoring device 6 uses a high-speed industrial camera with a visual recognition algorithm to collect core data such as aggregate flow rate, screen hole exposure rate, and material accumulation thickness on the screening screen 9 in real time, and simultaneously feeds them back to the external controller to provide data support for online adjustment of screening conditions and realize early prediction of screen clogging trend. Meanwhile, the vertical buffer rebound structure composed of the limiting groove 10, buffer 12, reset spring 13, and limiting seat 11 converts the potential energy of the aggregate falling and impacting the screening screen 9 into vertical rebound kinetic energy, which drives the screening screen 9 to complete high-frequency vertical tossing and throwing, causing the irregularly shaped aggregate stuck in the screen hole and the adhered fine powder to fall off, thereby reducing the probability of screen blockage from the root.

[0026] Specifically, the angle control mechanism 2 includes two fixed seats 21 fixedly installed on the base 1, two guide shafts 23 fixedly installed between the fixed seats 21, and an adjustment platform 24 slidably installed between the guide shafts 23. A control push rod 22 is fixedly installed on the side of one of the fixed seats 21 away from the adjustment platform 24, and the movable end of the control push rod 22 slides through the fixed seat 21 and is fixedly connected to one side of the adjustment platform 24.

[0027] In this embodiment, the extension and retraction of the push rod 22 drives the adjusting table 24 to slide linearly along the guide shaft 23. Then, the lifting and lowering of the adjusting frame 25 drives the screening frame 5 to rotate around the control shaft 29, thereby realizing the continuous adjustment of the screening angle of the screening frame 5 to adapt to the screening rate requirements of aggregates under various working conditions. The larger the angle of the screening frame 5, the faster the screening speed, and vice versa.

[0028] Specifically, several adjustment frames 25 are rotatably mounted on the top of the adjustment platform 24 via hinge seats. The top of each adjustment frame 25 is hinged to the bottom of the screening frame 5 via hinge seats. Each adjustment frame 25 has a self-locking telescopic rod 26 hinged to its outer wall. The top of each self-locking telescopic rod 26 is hinged to the bottom of the screening frame 5, forming a triangular support with the adjustment frame 25 to provide stable support for the adjusted screening frame 5.

[0029] In this implementation scheme, the self-locking telescopic rod 26 forms a stable triangular support structure with the bottom of the adjusting frame 25 and the screening frame 5. It can complete the self-locking limit by adjusting the angle, and avoid deformation and loosening even under screening vibration conditions, thus avoiding the problems of aggregate grading disorder and screening efficiency reduction caused by inaccurate screening elevation angle.

[0030] Specifically, a support frame 27 is fixedly installed on the side of the base 1 near the opening, a control shaft 29 is fixedly installed on the top of the support frame 27, and a U-shaped seat 210 is rotatably installed on the outer end of the control shaft 29. The top of the U-shaped seat 210 is fixedly connected to the bottom wall of the screening frame 5, and angle sensors 28 are installed on the outer wall of the U-shaped seat 210.

[0031] In this embodiment, the angle sensor 28 is coaxially mounted with the U-shaped seat 210, which can collect the actual rotation angle data of the screening frame 5 in real time and feed the data back to the external controller. After comparing the actual angle with the preset angle, the controller dynamically corrects the extension and retraction of the control push rod 22 to form a closed-loop control of the screening elevation angle.

[0032] Specifically, the crushing assembly 3 includes a stand 31 fixedly installed on the side of the base 1 near the feed inlet. The stand 31 is equipped with a crushing box 32. The top of the crushing box 32 is connected to a feed hopper 33, and the bottom of the crushing box 32 is connected to a discharge hopper 34. The discharge end of the discharge hopper 34 is located at a position that matches the feed inlet of the screening frame 5.

[0033] In this embodiment, the upright frame 31 provides high-strength rigid support for the crushing box 32, and the feed hopper 33 adopts a conical constriction structure with a large upper opening and a small lower opening, which can guide and gather the waste concrete blocks to avoid material splashing during the feeding process. The discharge end of the discharge hopper 34 is precisely aligned with the feed inlet of the screening frame 5, allowing the crushed material to fall into the screening mesh 9 area inside the screening frame 5 by gravity. This reduces the retention of material in the discharge hopper 34, improves the material conveying rate of the internal cavity of the discharge hopper 34, and reduces the retention rate of aggregates, fine sand and cement powder mixtures to avoid adhesion and accumulation.

[0034] Specifically, a crushing mechanism 36 is installed on the inner wall of the crushing box 32, and a striking mechanism 35 is connected to the crushing box 32. The crushing mechanism 36 includes two crushing rollers 362 rotatably installed on the inner wall of the crushing box 32. The two crushing rollers 362 mesh with each other. One end of the roller shaft of each crushing roller 362 passes through the crushing box 32 and is fixedly installed with a transmission gear 363. The two transmission gears 363 mesh with each other. A drive motor 361 is installed on the outer wall of the crushing box 32 away from the transmission gear 363. The power shaft of the drive motor 361 passes through the crushing box 32 and is fixedly connected to the roller shaft of one of the crushing rollers 362.

[0035] In this implementation scheme, the drive motor 361 adopts a variable frequency drive mode, which can adjust the rotation speed of the crushing roller 362 in real time according to the hardness of the raw material and the feed amount, so as to adapt to the crushing requirements of different strengths of different waste concrete. Two sets of meshing transmission gears 363 are used to achieve synchronous reverse rotation of two sets of crushing rollers 362, ensuring that the linear speed of the two sets of crushing rollers 362 is consistent, forming a uniform and stable extrusion crushing gap, avoiding material slippage and uneven crushing caused by the difference in the speed of crushing rollers 362, ensuring the regularity of the particle shape of the crushed aggregate, reducing the output of flaky and strip-shaped irregular aggregates, and reducing the probability of irregular aggregates clogging the screen holes from the root cause; At the same time, the main drive power of the crushing mechanism 36 synchronously drives the striking mechanism 35 to operate, so as to achieve complete synchronization between crushing operation and wall cleaning operation.

[0036] Specifically, the striking mechanism 35 includes positioning frames 353 fixedly installed at both ends of the horizontal direction of the outer side wall of the crushing box 32. Each positioning frame 353 is provided with a cross groove 352. Each cross groove 352 is slidably installed with a cross block 354. The same connecting rod 355 is fixedly installed between two cross blocks 354 on the same side. Several movable seats 356 are evenly installed on the connecting rod 355. Each movable seat 356 is fixedly installed with a striking hammer 357 on the side facing the crushing box 32. The outer wall of the striking hammer 357 is wrapped with a rubber pad.

[0037] In this implementation scheme, the cross block 354 is oriented and limited by the cross groove 352 to ensure that the cross block 354 can only reciprocate linearly in the horizontal direction, avoiding vertical movement during the movement, and ensuring that the striking direction of the hammer 357 is always perpendicular to the outer wall of the crushing box 32, thereby maximizing the transmission efficiency of the striking vibration. Multiple movable seats 356 and striking hammers 357 are evenly arranged at equal intervals along the connecting rod 355, which can synchronously strike the side wall of the crushing box 32 in a covering manner, causing the crushing box 32 and the discharge hopper 34 to vibrate, shaking off the cement stone fine powder and material clumps adhering to the inner wall of the box, avoiding the problem of reduced crushing chamber volume and uneven discharge caused by material sticking to the inner wall. The rubber pad on the outer wall of the striking hammer 357 can buffer the impact force of the striking, avoid the problem of box deformation and excessive noise caused by rigid striking, and extend the service life of the striking hammer 357.

[0038] Specifically, an adjusting arm 351 is rotatably mounted on the cross block 354 near the transmission gear 363. The end of the adjusting arm 351 near the crushing box 32 is rotatably connected to the outer wall of the transmission gear 363 via a rotating shaft.

[0039] In this embodiment, the two ends of the adjusting arm 351 are respectively hinged to the eccentric position of the end face of the transmission gear 363 and the cross block 354 to form a stable crank transmission mechanism. Each rotation of the transmission gear 363 can drive the cross block 354 to complete a complete horizontal reciprocating linear motion through the adjusting arm 351, realizing one strike and reset of the hammer 357, ensuring that the striking operation is synchronized with the rotation of the crushing roller 362, and the crushing operation is not stopped while the wall cleaning operation is not interrupted.

[0040] Specifically, discharge racks 14 are fixedly installed at the ends of screening racks 5 and screening mesh 9 near the opening. A heightening baffle 4 is installed on the top of each discharge rack 14. A guide seat 16 is fixedly installed on each discharge rack 14. Discharge ports 15 are connected to each discharge rack 14. The discharge ports 15 located at the top and bottom have opposite discharge directions, which are used to separate compliant and non-compliant concrete blocks.

[0041] In this implementation plan, the upper and lower sets of discharge racks 14 correspond one-to-one with the oversize material channel and undersize material channel of the screening mesh 9, forming independent and completely isolated graded discharge paths, thus completely avoiding the problem of cross-flow and mixing of qualified aggregates and oversized aggregates. The heightened baffle 4 is installed along the feed end to the discharge end of the discharge frame 14, which can effectively prevent the aggregate from rushing out of the discharge frame 14 during the rolling process, and prevent the problem of uncontrolled finished product gradation caused by oversized aggregate entering qualified aggregate. The guide seat 16 adopts a one-way inclined structure facing the discharge port 15, which can guide and gather the aggregate, avoid the accumulation and retention of materials in the discharge rack 14, and ensure smooth discharge of materials. The upper and lower discharge ports 15 are designed in opposite directions, which can be connected to the finished aggregate receiving equipment and the oversized aggregate return conveying equipment respectively, so as to realize the finished collection of qualified aggregates and the automatic return and secondary crushing of unqualified aggregates, forming a closed-loop continuous production of "crushing-screening-return".

[0042] Working principle: The control push rod 22, angle sensor 28, drive motor 361, and vision monitoring device 6 of this device are electrically connected to the external power supply through a standardized wiring layout. The models of the above-listed components can be flexibly selected from the existing standard parts system according to actual working conditions. The signal input terminals of the above-mentioned electrical control components are precisely connected one-to-one with the signal output terminals of the external controller. The signal feedback terminals of the vision monitoring device 6 and angle sensor 28 are connected to the signal input terminals of the controller, which can realize the real-time transmission and precise execution of commands, providing core support for the automated control of the device. The following is a detailed description of the specific working principle and technical effects. Self-locking and workstation preparation process: First, fix the entire device at the preset production workstation. Align the discharge end of the external concrete conveying equipment with the inlet of the feed hopper 33 to complete the preparatory docking of material conveying. At the same time, select the screening screen 9 with the corresponding screen size according to the particle size and gradation requirements of the target recycled aggregate, and assemble it into the screening frame 5. Complete the stable installation through the exclusive embedded self-locking quick-installation structure. The specific dynamic operation process is as follows: The screening screen 9 drives the integrated discharge frame 14 and the mounting base 8 to move synchronously, so that the mounting base 8 is inserted into the slide rail 7 preset on the inner wall of the screening frame 5. The mounting base 8 enters the slide rail 7 to achieve self-guidance in the installation process until the mounting base 8 is fully inserted into the preset position of the slide rail 7. The mounting base 8 and the slide rail 7 are screwed and fixed by fastening bolts through the preset screw groove, which ensures the rigidity and positional accuracy of the screening screen 9 installation and avoids the problems of inaccurate screen surface inclination angle and disordered aggregate grading path caused by screen displacement and movement. When the screening screen 9 is worn, damaged, or needs to be replaced, simply remove the fastening bolts to release the locking limit on the mounting base 8, and then pull the screening screen 9 to quickly pull the mounting base 8 out of the slide rail 7 to complete the removal and replacement of the screening screen 9.

[0043] Screening angle closed-loop adjustment and precise positioning process: Based on the screening process requirements of the target aggregate, the screening angle is preset and adjusted and controlled in a closed loop. The specific dynamic operation process is as follows: The control push rod 22 on one side of the fixed base 21 is activated. The output end of the control push rod 22 pushes the adjustment table 24 to slide linearly along the outer wall of the guide shaft 23. Then, the adjustment table 24 drives the hinged adjustment frame 25 to rise upward, pushing the left side of the screening frame 5 to rise synchronously, so as to achieve continuous adjustment of the screening angle. During the lifting process of the adjustment frame 25, the self-locking telescopic rod 26 hinged at its bottom is synchronously and adaptively stretched, forming a stable triangular support structure with the adjustment frame 25 and the bottom of the screening frame 5. It can complete the self-locking limit in the adjustment angle, ensuring the long-term stability of the screen surface inclination angle during the screening process. The right end of the screening frame 5 is connected to the control shaft 29 via a U-shaped seat 210. During the adjustment of the elevation angle of the screening frame 5, the U-shaped seat 210 is rotated on the control shaft 29. The angle sensor 28 collects the rotation angle data of the U-shaped seat 210 in real time, which is the actual elevation angle data of the screening frame 5, and feeds the data back to the external controller in real time. After comparing the actual value with the preset value, the controller dynamically corrects the extension and retraction of the control push rod 22 to form a closed-loop control of the elevation angle adjustment, which provides auxiliary support for the subsequent screening rate of aggregates. When the elevation angle of the screening frame 5 is adjusted to the preset value, the device completes the preparatory process and can start the crushing and screening operation.

[0044] Crushing operation and synchronous wall cleaning pretreatment process: The drive motor 361 is started to drive the corresponding crushing roller 362 and transmission gear 363 to rotate synchronously. Through the meshing transmission of the two sets of transmission gears 363, the two sets of crushing rollers 362 are driven to rotate synchronously in opposite directions to form a continuous crushing working surface. At the same time, the main transmission power of the crushing rollers 362 is used to synchronously drive the striking mechanism 35 to complete the wall cleaning operation of the crushing box 32, realizing the synchronous drive of crushing and wall cleaning. The specific dynamic operation process is as follows: While the transmission gear 363 rotates, it drives the adjusting arm 351, whose end face rotates eccentrically, to swing in a circular motion. The other end of the adjusting arm 351 is rotatably connected to the cross block 354 through a rotating shaft. The cross block 354 is limited and installed in the cross groove 352 of the positioning frame 353, and can only slide horizontally along the cross groove 352. The swing of the adjusting arm 351 drives the cross block 354 to make horizontal reciprocating linear motion along the cross groove 352. Then, through the connecting rod 355 installed at the end of the cross block 354, it drives the movable seat 356 and the hammer 357 to make synchronous horizontal reciprocating motion, so that the hammer 357 continuously strikes the outer wall of the crushing box 32 at a fixed frequency. Every time the transmission gear 363 completes one revolution, the hammer 357 synchronously completes one complete hammering reciprocating stroke, realizing the synchronization of crushing operation and box body hammering vibration. By striking, the crushing box 32 and the discharge hopper 34 are made to vibrate continuously. On the one hand, the mixture of concrete material, hardened cement stone, fine sand and cement stone powder and other materials attached to the inner wall of the crushing box 32 and the discharge hopper 34 can be shaken off, avoiding the problems of reduced crushing chamber volume, reduced crushing efficiency and uneven discharge caused by material sticking to the inner wall. On the other hand, the crushed aggregate can be pre-treated at the source, and the fine sand and cement powder mixture attached to the surface of the aggregate can be removed by vibration. (Because compliant aggregate will be reused after screening and appropriate proportions of auxiliary materials such as sand and cement will be added. If a large amount of fine sand and lime are attached to the surface of the aggregate after screening, it will affect the proportion of auxiliary materials added during the subsequent reuse of aggregate.) After preparation, the external concrete conveying equipment continuously conveys waste concrete blocks into the feed hopper 33. After the material enters the crushing chamber of the crushing box 32, it is crushed by impact and compression by two sets of counter-rotating crushing rollers 362. The crushed material is evenly discharged through the discharge hopper 34 and falls directly into the screening chamber of the screening frame 5 below. The built-in vibration motor at the bottom of the screening frame 5 is started, and the crushed recycled concrete aggregate is continuously vibrated and screened in accordance with the preset screening angle.

[0045] Aggregate Precision Grading and Screening and Anti-Crossing Process: After crushing, the aggregate falls into the screening frame 5 and is evenly distributed on the upper surface of the screening screen 9. Because the screening frame 5 and the screening screen 9 are in a preset inclined state, the aggregate, under the combined action of its own gravity and the vibration of the screen surface, continuously rolls and slides downwards along the inclined surface of the screening screen 9, simultaneously completing the particle size classification. The specific process is as follows: Compliant aggregates with particle size meeting the preset requirements pass through the screen holes of the screening mesh 9 and fall into the bottom cavity of the screening frame 5. They are discharged into the corresponding discharge frame 14 below and guided by the inclined guide seat 16. They are then discharged from the corresponding discharge port 15 to the external finished aggregate receiving equipment. Unqualified aggregates with excessive particle size cannot pass through the screen holes and continue to roll down along the upper surface of the screening mesh 9 into the corresponding discharge frame 14 above. They are then discharged from the corresponding discharge port 15 to the external return material conveying equipment and returned to the crushing unit for secondary crushing, forming a closed-loop process of "crushing-screening-return material". Both sides of the discharge rack 14 are equipped with raised baffles 4, which can effectively prevent aggregates from rushing out of the discharge rack 14 during the rolling process, avoid the problem of cross-flow and mixing of qualified aggregates and oversized aggregates, and eliminate the problem of uncontrolled aggregate gradation in finished products caused by the mixing of aggregates of different sizes.

[0046] Buffer-rebound adaptive anti-clogging process: During the screening process, the crushed aggregate continuously falls and impacts the screening screen 9, converting the impact potential energy of the material into the anti-clogging and clearing kinetic energy of the screen, realizing adaptive anti-clogging. The specific dynamic operation process is as follows: The slide rail 7 is connected to the limiting seat 11. The limiting seat 11 is limited and installed in the limiting groove 10 preset on the inner wall of the screening frame 5. It can only slide vertically along the limiting groove 10. A buffer 12 (industrial damper) and a return spring 13 are provided between the bottom of the limiting seat 11 and the bottom of the inner cavity of the limiting groove 10. The impact load generated by the continuous falling aggregate on the screening screen 9 is transmitted to the limiting seat 11 through the screening screen 9, the mounting seat 8, and the slide rail 7. This pushes the limiting seat 11 to slide downward along the limiting groove 10, and simultaneously compresses the buffer 12 and the return spring 13, thus completing the flexible absorption of impact energy. This avoids deformation and damage to the screening screen 9 caused by rigid impact, and greatly extends the service life of the screen.

[0047] When the impact load on the aggregates decays, the compressed buffer 12 and the return spring 13 release their elastic potential energy, pushing the limit seat 11, slide rail 7, mounting seat 8 and screening screen 9 to bounce back quickly upwards along the limit groove 10, causing all the aggregates on the screen surface to be thrown vertically. Because the mixture of fine sand and cement powder adhering to the surface of the aggregate is stripped by vibration, it falls onto the screening screen 9 along with the aggregate. Some of the mixture will block the mesh, preventing the compliant aggregate from passing through the mesh for screening. The buffer 12 and the return spring 13 continuously absorb the impact energy and, during the reset, will cause some unqualified aggregate to be slightly thrown up. When the aggregate returns to the screening screen 9, it will hit the mesh, thereby dispersing and clearing the mesh of the blocked fine sand and cement powder mixture. At the same time, because some aggregate is in the form of flakes or strips and gets stuck inside the mesh (it can be pulled out from the top of the screening screen 9 but cannot pass through, or some aggregate of similar size to the mesh gets stuck in the mesh, also causing blockage), the buffer 12 and the return spring 13 buffer and reset the screening screen 9 to throw the aggregate up and down during the adjustment stroke. The vibration of the screening screen 9 helps to discharge the aggregate stuck in the mesh, thus completing the cleaning of the mesh blockage. This structure differs substantially from existing screening methods that rely solely on horizontal vibration of the screen surface. By using high-frequency vertical rebound and tossing, it causes the sheet-like and strip-shaped aggregates stuck in the screen holes to undergo vertical displacement, escaping the rigid jamming state of the screen holes. At the same time, the fine powder adhering to the inner wall of the screen holes is dislodged by the vibration. This allows the screen holes to be cleared online using the impact potential energy of the material itself, fundamentally reducing the probability of screen hole blockage.

[0048] Intelligent collaborative control of blockage conditions based on visual feedback: Throughout the screening process, visual monitoring equipment 6 monitors the working status of the screening mesh 9 in real time, constructing a closed-loop intelligent handling system for blockage condition prediction and graded emergency control. The specific dynamic operation process is as follows: The visual monitoring device 6 adopts high-speed machine vision recognition technology to collect key characteristic data such as aggregate distribution, material flow rate, and screen hole exposure rate on the upper surface of the screening screen 9 in real time, and feeds the data back to the external controller in real time. The controller continuously compares the real-time monitoring data with the preset normal working condition threshold. When the screen hole shows a clogging trend, the aggregate flow rate on the screen surface will continue to decrease and the screen hole exposure rate will decrease significantly. This feature is much earlier than the occurrence of abnormal aggregate gradation in the finished product, and can realize the early prediction of clogging conditions. When the controller determines that the screening screen 9 is showing signs of blockage and the material flow rate is consistently lower than the preset threshold, it immediately activates the graded emergency plan to achieve uninterrupted online unblocking: the first level of control synchronously increases the vibration frequency and amplitude of the built-in vibration motor of the screening frame 5, strengthens the horizontal vibration effect of the screen surface, and helps to remove irregularly shaped aggregates stuck in the screen holes through mutual friction and collision between aggregates. The second level of coordinated control dynamically adjusts the screening angle of the screening frame 5 by controlling the push rod 22. The angle is appropriately increased to accelerate the rolling speed of the aggregate on the screen surface, reduce the accumulation time of the aggregate on the screen surface, avoid aggregate accumulation and overflow, and quickly restore the effective screening area and screening rate of the screen.

[0049] This closed-loop control system enables early prediction, online identification, and dynamic handling of screen blockage conditions. At the same time, through the coordinated operation of crushing and screening processes, it avoids the problem of over-crushing caused by the return of qualified aggregates with oversized aggregates, ensuring the continuous and stable operation of the recycled aggregate preparation production line and the long-term stability of the particle size distribution and gradation curve of the finished aggregates, thus meeting the requirements of recycled concrete for aggregate quality.

[0050] The above-described embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit it. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A recycled concrete crushing and screening co-processing device based on particle size feedback adjustment, comprising a base, characterized in that: An angle control mechanism is installed on the top of the base, a screening frame is installed on the top of the angle control mechanism, a feed inlet is provided on one side above the screening frame, the screening frame is open at one side away from the feed inlet, and a crushing component is installed on the top of the base corresponding to the position of the feed inlet. The top of the screening frame is equipped with a visual monitoring device. Several limiting grooves are evenly opened on the two opposite inner side walls of the screening frame. A buffer is installed on the inner wall of each limiting groove. A return spring is sleeved on the outer wall of each buffer. A limiting seat that slides in the inner wall of the limiting groove is installed at the top of each buffer. The limiting seats on the same side are all fixedly installed with the same slide rail. A mounting seat is slidably installed on the inner wall of each slide rail. A screening screen is installed between the mounting seats. A vibration motor is built into the bottom of the screening frame.

2. The recycled concrete crushing and screening co-processing equipment based on particle size feedback adjustment according to claim 1, characterized in that: The angle control mechanism includes two fixed seats fixedly installed on the base, two guide shafts installed between the fixed seats, and an adjustment platform slidably installed between the guide shafts. A control push rod is fixedly installed on one of the fixed seats on the side away from the adjustment platform, and the movable end of the control push rod slides through the fixed seat and is fixedly connected to one side of the adjustment platform.

3. The recycled concrete crushing and screening co-processing equipment based on particle size feedback adjustment according to claim 2, characterized in that: Several adjustment frames are rotatably mounted on the top of the adjustment platform. The top of each adjustment frame is hinged to the bottom of the screening frame via a hinged seat. Each adjustment frame has a self-locking telescopic rod hinged to its outer side wall. The top of each self-locking telescopic rod is hinged to the bottom of the screening frame.

4. The recycled concrete crushing and screening co-processing equipment based on particle size feedback adjustment according to claim 1, characterized in that: A support frame is fixedly installed on the side of the base near the opening. A control shaft is fixedly installed on the top of the support frame. U-shaped seats are rotatably installed at both ends of the control shaft. The top of the U-shaped seats is fixedly connected to the bottom wall of the screening frame. Angle sensors are installed on the outer wall of the U-shaped seats.

5. The recycled concrete crushing and screening co-processing equipment based on particle size feedback adjustment according to claim 1, characterized in that: The crushing assembly includes a vertical frame fixedly installed on the base near the feed inlet. The vertical frame is equipped with a crushing box. A feed hopper is connected to the top of the crushing box, and a discharge hopper is connected to the bottom of the crushing box. The discharge end of the discharge hopper is located in a position that matches the feed inlet of the screening frame.

6. The recycled concrete crushing and screening co-processing equipment based on particle size feedback adjustment according to claim 5, characterized in that: A crushing mechanism is installed on the inner wall of the crushing box, and a striking mechanism is connected to the crushing box. The crushing mechanism includes two crushing rollers rotatably installed on the inner wall of the crushing box. The two crushing rollers mesh with each other. One end of the roller shaft of each crushing roller passes through the crushing box and is fixedly installed with a transmission gear. The two transmission gears mesh with each other. A drive motor is installed on the outer wall of the crushing box on the side away from the transmission gear. The power shaft of the drive motor passes through the crushing box and is fixedly connected to one of the crushing roller shafts.

7. The recycled concrete crushing and screening co-processing equipment based on particle size feedback adjustment according to claim 6, characterized in that: The striking mechanism includes positioning frames fixedly installed at both ends of the outer wall of the crushing box in the horizontal direction. Each positioning frame is provided with a cross groove, and a cross block is slidably installed in each cross groove. The same connecting rod is fixedly installed between two cross blocks on the same side. Several movable seats are evenly installed on the connecting rod, and a striking hammer is fixedly installed on the side of each movable seat facing the crushing box.

8. The recycled concrete crushing and screening co-processing equipment based on particle size feedback adjustment according to claim 7, characterized in that: An adjusting arm is rotatably mounted on the cross block near the transmission gear, and one end of the adjusting arm is rotatably connected to the outer wall of the transmission gear.

9. The recycled concrete crushing and screening co-processing equipment based on particle size feedback adjustment according to claim 1, characterized in that: The screening frame and the screening screen are both fixedly installed with a discharge frame at the end near the opening. The top of the discharge frame is equipped with a heightening baffle. The discharge frame is fixedly installed with a guide seat. The discharge frame is connected to a discharge port. The discharge ports located at the upper and lower parts have opposite discharge directions.

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