A construction engineering waste steel pipe classification device

Abstract

The application is suitable for the technical field of waste steel pipe classification, and provides a waste steel pipe classification device for construction engineering.The device comprises a sorting table, the middle part of the sorting table is hollow, a steel pipe limiting and screening mechanism is arranged on the upper side of the sorting table, a steel pipe intercepting and screening mechanism is arranged on the lower side of the sorting table, a baffle is arranged on the lower side of the steel pipe intercepting and screening mechanism, the sorting table is fixedly connected with a support, the support can be connected with an external air filtering box through a hose, the support is fixedly connected with an electric telescopic rod, and the telescopic end of the electric telescopic rod is fixedly connected with a roller pressing mechanism.The application realizes multi-dimensional accurate sorting and surface cleaning of the waste steel pipe in a single process, eliminates the material transfer link of step-by-step operation, and reduces the equipment floor area.The dynamic pressure adjusting mechanism can ensure the sorting accuracy and avoid damage to the steel pipe, and the dust suction system can effectively control the pollution of the working environment.

Description

Technical Field

[0001] This invention belongs to the field of waste steel pipe sorting technology, and particularly relates to a waste steel pipe sorting device for construction engineering. Background Technology

[0002] During the construction and demolition of buildings, a large number of waste steel pipes of different specifications are generated. Effective recycling and reuse of these pipes can create significant economic and environmental benefits. However, the prerequisite for recycling and reuse is the precise sorting and processing of these mixed waste steel pipes.

[0003] Currently, the sorting of waste steel pipes typically relies on manual sorting or simple mechanical screening. Manual sorting has many drawbacks: it is not only inefficient and labor-intensive, but its accuracy is also affected by worker experience, making it difficult to guarantee consistency. Existing mechanical screening devices are relatively simple, usually only able to sort based on one dimension—diameter or length—making it difficult to perform efficient multi-dimensional sorting simultaneously. This single-dimensional sorting method often necessitates secondary sorting, increasing processing steps and time costs.

[0004] Furthermore, discarded steel pipes often have stubborn dirt such as concrete, rust, and paint adhering to their surfaces. This dirt not only affects the accuracy of steel pipe sorting (for example, dirt can lead to inaccurate diameter measurements) but also seriously affects the quality of subsequent recycling and processing. Currently, the common practice is to first sort the steel pipes and then send them to specialized cleaning equipment for surface treatment. This step-by-step approach requires additional equipment and transportation processes, resulting in a lengthy, space-consuming, and inefficient recycling line. At the same time, because the degree and nature of dirt on different steel pipe surfaces vary, a fixed cleaning intensity often fails to achieve the desired cleaning effect, either resulting in incomplete cleaning or potential damage to the steel pipes themselves.

[0005] Therefore, there is an urgent need in this field for an integrated solution that can combine the sorting and preliminary cleaning functions of waste steel pipes, and simultaneously complete sorting by diameter and length as well as surface grinding on a single device, while intelligently adjusting the cleaning intensity to adapt to the condition of different steel pipes, thereby significantly improving sorting accuracy and recycling efficiency.

[0006] To address the aforementioned issues, existing technologies urgently need improvement. Summary of the Invention

[0007] The purpose of this invention is to provide a waste steel pipe sorting device for construction projects, which aims to solve the problem that existing mechanical screening devices have relatively limited functions and can usually only sort steel pipes based on one dimension, either diameter or length.

[0008] This invention is implemented as follows: a waste steel pipe sorting device for construction projects includes a sorting table with a hollow center. A steel pipe limiting screening mechanism is installed on the upper side of the sorting table, capable of sorting steel pipes of different diameters. A steel pipe intercepting screening mechanism is installed on the lower side of the sorting table, capable of sorting steel pipes of different lengths. A baffle is installed on the lower side of the steel pipe intercepting screening mechanism. A support is fixedly connected to the sorting table, and the support can be connected to an external air filter box via a flexible hose. An electric telescopic rod is fixedly connected to the support, and a roller pressing mechanism is fixedly connected to the telescopic end of the electric telescopic rod. The roller pressing mechanism can simultaneously grind all steel pipes by cooperating with the steel pipe limiting screening mechanism. The device also includes: The pressure regulation system can adjust the extrusion pressure on the steel pipe between the steel pipe limiting screening mechanism and the roller pressing mechanism during grinding, thereby controlling the sorting accuracy of steel pipes of different diameters.

[0009] A further technical solution is provided, wherein the steel pipe limiting screening mechanism includes a support base, a guide rod, and a sliding seat; a support base is provided on both sides of the upper surface of the sorting platform, and a guide rod is fixedly connected to each support base. Multiple sliding seats are slidably connected through the guide rod, and a spring is provided between each two adjacent sliding seats. A limiting wheel is rotatably connected between two sliding seats in the same row.

[0010] In a further technical solution, the steel pipe limiting screening mechanism also includes an electric push rod and a push plate. Each support seat is fixedly connected to an electric push rod, and each telescopic end of the electric push rod is fixedly connected to a push plate. The push plate is slidably connected to the guide rod, and the push plate can elastically abut against the outermost sliding seat.

[0011] A further technical solution is that the steel pipe interception and screening mechanism includes a bidirectional threaded rod, a movable seat, and a stop bar; The sorting table is fixedly connected to a bidirectional threaded rod, which has threads in opposite directions. Two movable seats are threadedly connected to the bidirectional threaded rod. The movable seats are slidably connected to the lower side of the sorting table. Each movable seat is fixedly connected to a stop bar. The two stop bars are located on the lower side of all the limit wheels, and both stop bars are perpendicular to the direction of each limit wheel.

[0012] In a further technical solution, the roller pressing mechanism includes a fixed frame, a drive motor, a connecting seat, and a roller pressing plate; The telescopic rod is fixedly connected to a fixed frame at its telescopic end. A connecting seat is slidably connected in the fixed frame. A drive motor is installed on the fixed frame. The output shaft of the drive motor is threadedly connected to the connecting seat. A roller plate is inserted into the lower end of the connecting seat. A pressure sensor is installed between the roller plate and the lower end face of the connecting seat. The roller plate is positioned above all the limit wheels.

[0013] In a further technical solution, multiple air intake ports are provided on the lower side of the roller plate, and each air intake port is connected to an air pump on the upper surface of the roller plate.

[0014] Further technical solutions, the control system includes: The monitoring module can monitor the diameter of all steel pipes, the overall dirt density on the surface of all steel pipes, and the rotation speed of all steel pipes during grinding. Data processing module: It can construct a steel pipe surface treatment evaluation model based on the maximum diameter difference between all steel pipes, the overall dirt density on the surface of all steel pipes, and the minimum rotation speed of each steel pipe, and output the surface treatment evaluation coefficient; then, based on the current extrusion pressure on the roller plate and the surface treatment evaluation coefficient, it can construct a pressure adjustment model and output the target extrusion pressure. Control module: Based on the target extrusion pressure output by the pressure regulation model, the control module controls the electric push rod.

[0015] A further technical solution involves substituting the maximum diameter difference between all steel pipes, the overall dirt density on the surface of all steel pipes, and the minimum rotation speed of each steel pipe into the maximum value normalization formula for processing, and generating the diameter difference index, dirt density index, and minimum rotation speed index respectively. The evaluation model for steel pipe surface treatment is as follows: ; in , as well as These are the weighting coefficients for diameter difference, dirt density, and rotational speed, respectively. ,and , as well as All greater than ; The diameter difference index, The dirt density index, The lowest speed index, This is the surface treatment evaluation coefficient.

[0016] A further technical solution, the pressure regulation model is as follows: ; in This represents the current compressive force applied to the roller plate. For surface treatment evaluation coefficients, The target compressive force.

[0017] Compared with the prior art, the beneficial effects of the present invention are as follows: This application achieves multi-dimensional precision sorting and surface cleaning of waste steel pipes in a single process, eliminating the material transfer links in step-by-step operations and reducing the equipment footprint. A dynamic pressure regulation mechanism ensures sorting accuracy while preventing damage to the steel pipes, and a dust extraction system effectively controls environmental pollution. This integrated design significantly improves the efficiency and quality of waste steel pipe recycling.

[0018] This application enables real-time adjustment of the spacing between the limit wheels according to changes in the steel pipe diameter, avoiding problems such as missed screening or blockage caused by a fixed limit gap. The linear movement of the sliding seat along the guide rod ensures the accuracy of the limit wheel arrangement, and the elastic characteristics of the spring make the clamping force positively correlated with the steel pipe diameter, ensuring effective constraint on the steel pipe while preventing excessive compression that would increase conveying resistance. The rotational design of the limit wheels significantly reduces wear on the steel pipe surface and improves conveying smoothness, ultimately achieving high-precision and high-efficiency steel pipe diameter sorting.

[0019] This application can automatically compensate for extrusion pressure deviations based on differences in steel pipe diameter, avoiding localized insufficient pressure or overload caused by uneven diameter; it dynamically increases extrusion pressure through dirt density monitoring to ensure effective removal of stubborn dirt; and it identifies rotational obstruction through minimum speed monitoring, promptly reducing extrusion pressure to prevent jamming. This achieves synergistic optimization of sorting accuracy and surface treatment quality, eliminating the need for manual intervention and improving the continuity of sorting operations.

[0020] This application can optimize the roller pressure in real time based on the density of dirt on the steel pipe surface, diameter differences, and movement status. While ensuring the effective removal of stubborn dirt, it avoids steel pipe deformation or sorting errors caused by excessive pressure, thus achieving a synergistic improvement in sorting accuracy and cleaning effect. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the structure of the present invention; Figure 2 This is a schematic diagram of the roller pressing mechanism in this invention; Figure 3 This is a schematic diagram of the roller plate structure in this invention; Figure 4 This is a schematic diagram of the steel pipe interception and screening mechanism in this invention; Figure 5 This is a schematic diagram of the steel pipe limiting screening mechanism in this invention.

[0022] In the attached diagram: 1. Sorting table; 2. Steel pipe limiting screening mechanism; 21. Support seat; 22. Guide rod; 23. Sliding seat; 24. Spring; 25. Limiting wheel; 26. Electric push rod; 27. Push plate; 3. Steel pipe intercepting screening mechanism; 31. Bidirectional threaded rod; 32. Moving seat; 33. Stop bar; 4. Baffle; 5. Roller pressing mechanism; 51. Fixed frame; 52. Drive motor; 53. Connecting seat; 54. Roller pressing plate; 6. Air pump; 7. Bracket; 8. Electric telescopic rod; 9. Air intake port. Detailed Implementation

[0023] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the invention.

[0024] The specific implementation of the present invention will be described in detail below with reference to specific embodiments.

[0025] like Figure 1 As shown, an embodiment of the present invention provides a waste steel pipe sorting device for construction engineering, including a sorting table 1, which is hollow in the middle. A steel pipe limiting screening mechanism 2 is provided on the upper side of the sorting table 1, capable of sorting steel pipes of different diameters. A steel pipe intercepting screening mechanism 3 is provided on the lower side of the sorting table 1, capable of sorting steel pipes of different lengths. A baffle 4 is provided on the lower side of the steel pipe intercepting screening mechanism 3. A bracket 7 is fixedly connected to the sorting table 1, and the bracket 7 can be connected to an external air filter box through a flexible hose. An electric telescopic rod 8 is fixedly connected to the bracket 7, and a roller pressing mechanism 5 is fixedly connected to the telescopic end of the electric telescopic rod 8. The roller pressing mechanism 5 can simultaneously grind all steel pipes by cooperating with the steel pipe limiting screening mechanism 2. The device also includes: The pressure regulation system can adjust the extrusion pressure on the steel pipe between the steel pipe limiting screening mechanism 2 and the roller pressing mechanism 5 during grinding, thereby controlling the sorting accuracy of steel pipes of different diameters.

[0026] In this embodiment, after the steel pipes enter the sorting table 1, they are first screened by diameter by the upper adjustable limiting wheels 25. Steel pipes with smaller diameters fall through the gap between the limiting wheels 25. The gap between the limiting wheels 25 is maintained by the preload of the spring 24. When the roller pressing mechanism 5 presses down, dynamic extrusion is generated. The pressure adjustment system automatically adjusts the gap between the limiting wheels 25 according to the difference in steel pipe diameter, ensuring accurate sorting while completing surface grinding. The steel pipes that pass through the limiting wheels 25 fall to the area of ​​the lower baffle 33. The bidirectional threaded rod 31 drives the baffle 33 to change the interception gap. Steel pipes with a length smaller than the gap continue to fall to complete the sorting. The dust generated during grinding is sucked into the external filtration system through the air intake 9 to avoid environmental pollution. The electric telescopic rod 8 controls the roller pressing height, and combined with the real-time feedback from the pressure sensor, a closed-loop control of the extrusion pressure is formed.

[0027] Compared to existing technologies, traditional equipment only has a single sorting function and separates the cleaning process. This solution, through the synergistic design of a double-layer sorting structure and dynamic pressure regulation, simultaneously achieves diameter and length sorting and surface treatment at a single station. The dynamic cooperation between the adjustable limit wheel 25 and the roller pressing mechanism 5 solves the problem of sorting accuracy being affected by surface contamination and avoids the material turnover required by traditional step-by-step operations. The introduction of the pressure regulation system enables the equipment to adapt to steel pipes of different specifications, overcoming the defects of fixed pressure devices that easily lead to steel pipe deformation or incomplete cleaning.

[0028] like Figure 5 As shown in the preferred embodiment of the present invention, the steel pipe limiting screening mechanism 2 includes a support base 21, a guide rod 22, and a sliding seat 23; the upper end face of the sorting table 1 is provided with support bases 21 on both sides, the support bases 21 are fixedly connected with guide rods 22, and multiple sliding seats 23 are slidably connected through the guide rods 22. A spring 24 is provided between two adjacent sliding seats 23, and a limiting wheel 25 is rotatably connected between two sliding seats 23 in the same row.

[0029] In this embodiment, when steel pipes of different diameters enter the sorting table 1, the steel pipes contact the limiting wheels 25, generating lateral pressure that pushes the sliding seats 23 to slide along the guide rod 22. The springs 24 between adjacent sliding seats 23 are compressed, generating a reverse force that automatically adjusts the spacing between the sliding seats 23 to match the diameter of the steel pipes. The two sliding seats 23 in the same row form a dynamic clamping structure through the limiting wheels 25, maintaining a flexible constraint on the steel pipes under the elastic force of the springs 24. During the conveying process, the steel pipes push the limiting wheels 25 to rotate, reducing frictional resistance and allowing the steel pipes to move along a predetermined trajectory to the corresponding sorting area. Through the linear movement of the sliding seats 23 and the guide rod 22 combined with the elastic deformation of the springs 24, a continuously variable limiting distance is formed, realizing the step-by-step sorting of steel pipes of different diameters.

[0030] Compared with existing technologies, traditional mechanical screening devices typically employ fixed-gap limiting structures or manual adjustment devices, which cannot adapt to continuous changes in steel pipe diameter. Fixed-gap structures easily lead to small-diameter steel pipes missing from the screen or large-diameter steel pipes getting stuck, while manual adjustment requires frequent machine stops, severely impacting sorting efficiency. This solution achieves automatic adjustment of the limiting gap through the coupling effect of the sliding seat 23 and the spring 24, enabling continuous sorting operations without manual intervention.

[0031] like Figure 5 As shown, in a preferred embodiment of the present invention, the steel pipe limiting screening mechanism 2 further includes an electric push rod 26 and a push plate 27. The support base 21 is fixedly connected to the electric push rod 26, and the telescopic end of the electric push rod 26 is fixedly connected to the push plate 27. The push plate 27 is slidably connected to the guide rod 22, and the push plate 27 can elastically abut against the outermost sliding seat 23.

[0032] In this embodiment, after the electric push rod 26 is energized, it drives the push plate 27 to translate along the axis of the guide rod 22. The elastic buffer pad at the front end of the push plate 27 forms flexible contact with the side of the sliding seat 23. When the push plate 27 moves forward, the elastic buffer pad is compressed and deformed, generating a reaction force that pushes the array of sliding seats 23 to move as a whole along the guide rod 22, thereby changing the distance between adjacent limit wheels 25. During the adjustment process, the deformation of the elastic buffer pad can offset the inertial impact caused by the sudden change in the speed of the electric push rod 26, avoiding rigid collisions between the sliding seats 23 and the guide rod 22. The linear motion constraint function of the guide rod 22 ensures the linearity of the displacement trajectory of the push plate 27, preventing lateral offset from causing errors in the adjustment of the distance between the limit wheels 25. This achieves dynamic and precise adjustment of the distance between the limit wheels 25, while maintaining the stability of the mechanism through elastic contact.

[0033] Compared with existing technologies, traditional steel pipe sorting devices mostly use manual adjustment bolts to fix the spacing of the limit wheels 25, which is not only inefficient but also unable to achieve dynamic adjustment. Although some mechanical adjustment mechanisms can achieve automatic adjustment, their rigid transmission structure is prone to vibration during movement reversal, resulting in a decrease in the positioning accuracy of the limit wheels 25. This solution combines an electric push rod 26 with an elastic abutment structure to achieve electric dynamic adjustment while using the deformation of the elastic element to absorb mechanical impact, effectively eliminating rigid collisions between moving parts and significantly improving the stability of the adjustment process.

[0034] Through the above technical solution, this application solves the problem of mechanical vibration caused by rigid contact during the adjustment of the spacing of the limiting wheels 25 in the steel pipe sorting device, and realizes dynamic adaptation and sorting of steel pipes of different diameters. The elastic abutment structure continuously provides flexible buffering during the adjustment process, ensuring smooth movement of the sliding seat 23 array and avoiding positional displacement of the limiting wheels 25 due to impact. The linear constraint effect of the guide rod 22 combined with the precise displacement control of the electric push rod 26 improves the adjustment accuracy of the spacing of the limiting wheels 25 to the millimeter level, meeting the requirements of high-precision sorting operations.

[0035] like Figure 4 As shown, in a preferred embodiment of the present invention, the steel pipe interception and screening mechanism 3 includes a bidirectional threaded rod 31, a movable seat 32, and a stop rod 33; The sorting table 1 is fixedly connected to a bidirectional threaded rod 31. The bidirectional threaded rod 31 is provided with threads in opposite directions, and two movable seats 32 are threadedly connected to the bidirectional threaded rod 31. The movable seats 32 are slidably connected to the lower side of the sorting table 1. Each movable seat 32 is fixedly connected to a stop rod 33. The two stop rods 33 are located on the lower side of all the limit wheels 25, and the two stop rods 33 are perpendicular to the direction of each limit wheel 25.

[0036] In this embodiment, the bidirectional threaded rod 31 refers to a transmission component with two sections of threads in opposite directions. Specifically, it can be implemented using a trapezoidal threaded rod, and the length of the threaded section can be 80%-120% of the width of the sorting table 1. This structure allows the two moving seats 32 to produce symmetrical displacement when the rod rotates, achieving precise adjustment of the distance between the stop rods 33. The moving seat 32 refers to a sliding component with internal threads, specifically implemented using a copper-based alloy bushing. The internal threads cooperate with the bidirectional threaded rod 31 to form a transmission pair. The stop rod 33 refers to a cylindrical intercepting component, specifically implemented using a chrome-plated steel rod. Its axial direction is orthogonal to the axis of the limiting wheel 25, forming a transverse intercepting surface.

[0037] Specifically, when steel pipes need to be sorted by length, the bidirectional threaded rod 31 is driven to rotate. Due to the action of the two reverse threads, the two moving seats 32 move synchronously towards or in opposite directions along the bottom guide rail of the sorting table 1. For example, when the threaded rod rotates clockwise, the distance between the two moving seats 32 decreases; when it rotates counterclockwise, the distance increases. The sliding connection design of the moving seats 32 ensures the straightness of the movement trajectory and avoids jamming caused by deviation. After the distance between the stop rods 33 is adjusted to the correct position, the steel pipes that have completed diameter sorting roll down along the limiting wheel 25. Steel pipes with a length less than the distance between the stop rods 33 pass directly through the gap and fall into the lower collection area, while steel pipes with a length greater than the distance are intercepted by the stop rods 33 and guided to the lateral collection trough. The entire process is carried out immediately after diameter sorting, forming a continuous sorting operation.

[0038] Through the above technical solution, this application achieves dynamic sorting of steel pipes by length, overcoming the technical deficiency of traditional devices with only one sorting dimension. The continuously adjustable spacing of the baffles 33 allows a single unit to handle waste steel pipes of various lengths, covering sorting needs from 1 meter to 6 meters. The bidirectional threaded rod 31 transmission mechanism ensures adjustment accuracy while possessing a self-locking function, maintaining the set spacing even without power, thus preventing parameter deviations caused by vibration. The collaborative work of this mechanism and the diameter sorting module enables waste steel pipes to complete dual sorting of diameter and length in a single processing flow, improving sorting efficiency compared to traditional step-by-step operations.

[0039] like Figure 2 As shown, in a preferred embodiment of the present invention, the roller pressing mechanism 5 includes a fixed frame 51, a drive motor 52, a connecting seat 53, and a roller pressing plate 54; The telescopic end of the electric telescopic rod 8 is fixedly connected to a fixed frame 51. A connecting seat 53 is slidably connected in the fixed frame 51. A drive motor 52 is installed on the fixed frame 51. The output shaft of the drive motor 52 is threadedly connected to the connecting seat 53. A roller plate 54 is inserted into the lower end of the connecting seat 53. A pressure sensor is installed between the roller plate 54 and the lower end face of the connecting seat 53. The roller plate 54 is located above all the limit wheels 25.

[0040] In this embodiment, when the electric telescopic rod 8 drives the fixed frame 51 to move vertically, the roller pressing mechanism 5 moves closer to or further away from the steel pipe limiting screening mechanism 2. The drive motor 52 pushes the connecting seat 53 to slide along the fixed frame 51 via threaded transmission, thereby precisely adjusting the initial distance between the roller pressing plate 54 and the steel pipe. During the grinding operation, the pressure sensor continuously monitors the extrusion force applied by the roller pressing plate 54. When the pressure deviates from the set threshold, the drive motor 52 automatically adjusts the position of the connecting seat 53 to restore the target pressure value. The roller pressing plate 54 can be quickly replaced through a detachable plug-in structure. For example, a roller pressing plate 54 with a larger contact area can be selected for steel pipes with larger diameters. The layout of the roller pressing plates 54 above all the limiting wheels 25 ensures that multiple steel pipes receive uniform grinding treatment simultaneously, avoiding sorting errors caused by uneven pressure at a single point.

[0041] Compared to existing technologies, traditional steel pipe sorting equipment's grinding mechanisms mostly employ a fixed pressure mode, failing to dynamically adjust the extrusion pressure based on changes in steel pipe diameter or the amount of surface contaminants. This solution, however, achieves real-time feedback and automatic compensation of extrusion pressure parameters through closed-loop control of a pressure sensor and drive motor 52. Existing technologies often employ integrated roller pressing structures that cannot adapt to adjustments in the contact surface of steel pipes with different diameters. This solution utilizes a detachable roller pressing plate 54 and a height-adjustable connecting seat 53 to form a multi-stage pressure adjustment mechanism.

[0042] Through the above technical solution, this application can automatically adjust the grinding pressure according to the density of dirt on the steel pipe surface, avoiding dirt residue due to insufficient pressure or deformation of the steel pipe caused by excessive pressure. Through the coordinated control of the pressure sensor and the drive motor 52, a constant effective extrusion pressure is maintained during the sorting process, eliminating grinding quality fluctuations caused by differences in steel pipe diameter. The replaceable roller plate 54 structure ensures that steel pipes of different specifications can obtain the optimal contact area, preventing excessive local wear due to insufficient contact surface. The real-time monitoring and dynamic adjustment mechanism of pressure parameters enables the device to simultaneously complete high-precision sorting and differentiated surface treatment.

[0043] like Figure 3 As shown, in a preferred embodiment of the present invention, a plurality of air intake ports 9 are provided on the lower side of the roller plate 54, and the air intake ports 9 are all connected to the air pump 6 on the upper end face of the roller plate 54.

[0044] In this embodiment, when the roller plate 54 applies pressure to the surface of the steel pipe for grinding, the air pump 6 starts simultaneously and forms a negative pressure area at the air intake 9. Metal debris and concrete particles generated during grinding are drawn into the air intake 9 along the movement trajectory of the roller plate 54 and transported to the external filtration system through the internal cavity of the roller plate 54. The spatial distribution of the air intake 9 matches the working surface shape of the roller plate 54, ensuring that debris in the grinding contact area is captured the instant it is generated. The start / stop logic of the air pump 6 is linked to the movement state of the roller pressing mechanism 5. When the roller plate 54 is lifted away from the surface of the steel pipe, the air pump 6 automatically reduces its power to reduce energy consumption.

[0045] In a preferred embodiment of the present invention, the control system includes: The monitoring module can monitor the diameter of all steel pipes, the overall dirt density on the surface of all steel pipes, and the rotation speed of all steel pipes during grinding. Data processing module: It can construct a steel pipe surface treatment evaluation model based on the maximum diameter difference between all steel pipes, the overall dirt density on the surface of all steel pipes, and the minimum rotation speed of each steel pipe, and output the surface treatment evaluation coefficient; then, based on the current extrusion pressure on the roller plate 54 and the surface treatment evaluation coefficient, it can construct a pressure adjustment model and output the target extrusion pressure. Control module: Based on the target extrusion pressure output by the pressure regulation model, the control module controls the electric push rod 26.

[0046] In this embodiment, the monitoring module refers to a combined device integrating a laser ranging sensor and an image processing unit. Specifically, it can employ an array of laser sensor groups to scan the outer contour of the steel pipe in real time, and combine this with machine vision algorithms to calculate the diameter distribution and surface dirt coverage. This module provides basic parameters for subsequent model construction through multi-dimensional data acquisition.

[0047] The data processing module, embedded in the industrial controller, is a computing unit that uses a normalization algorithm to process raw monitoring data, converting the maximum diameter difference, dirt density, and minimum rotation speed into standardized indices. It then calculates surface treatment evaluation coefficients using preset weighting factors. This module achieves parameter fusion analysis by quantifying the processing difficulty.

[0048] The control module refers to the closed-loop control system connected to the pressure sensor. Specifically, it can use a PID control algorithm to analyze the deviation between the target extrusion pressure and the current value, and change the pressure of the roller plate 54 by adjusting the extension and retraction displacement of the electric push rod 26. This module transforms the theoretical model into physical execution actions.

[0049] Specifically, a laser sensor array is arranged laterally along the sorting table 1, scanning the outer diameter of the steel pipe to generate a diameter distribution curve. The image processing unit calculates the surface dirt density through grayscale analysis. The rotation speed is obtained by an encoder monitoring the speed fluctuation of the roller press 54 drive motor 52. The data processing module substitutes the maximum diameter difference, dirt density, and minimum speed into a normalization formula to generate a standardized index, and calculates the surface treatment evaluation coefficient according to preset weighting coefficients. This coefficient, together with the current extrusion pressure, is input into the pressure adjustment model to generate a target extrusion pressure value. The control module compares the target value with the pressure sensor feedback value in real time, and changes the downward pressure of the roller press 54 by adjusting the stroke of the electric push rod 26, forming a dynamic pressure adjustment closed loop.

[0050] As a preferred embodiment of the present invention, the maximum diameter difference between all steel pipes, the overall dirt density on the surface of all steel pipes, and the minimum rotation speed of each steel pipe are substituted into the maximum value normalization formula for processing, and the diameter difference index, dirt density index and minimum rotation speed index are generated respectively. The evaluation model for steel pipe surface treatment is as follows: ; in , as well as These are the weighting coefficients for diameter difference, dirt density, and rotational speed, respectively. ,and , as well as All greater than ; The diameter difference index, The dirt density index, The lowest speed index, This is the surface treatment evaluation coefficient.

[0051] In this embodiment, the maximum diameter difference refers to the difference between the maximum and minimum outer diameters of steel pipes in the same batch. Specifically, this can be achieved by using a laser diameter gauge to collect steel pipe diameter data in real time and calculating the difference using a difference calculation module. This parameter reflects the impact of the steel pipe size dispersion on sorting accuracy. The dirt density index refers to the mass of dirt adhering to the surface of the steel pipe per unit area. Specifically, it can be generated by analyzing the surface dirt coverage using image recognition technology and combining it with density sensor data. This parameter quantifies the impact of surface dirt on grinding resistance. The minimum rotational speed index refers to the minimum rotational speed of the steel pipe during the rolling process. Specifically, it can be achieved by monitoring the rotational angular velocity of the steel pipe using an encoder and extracting the minimum value. This parameter characterizes the frictional resistance between the steel pipe and the limiting mechanism. The maximum value normalization formula involves dividing the original parameter value by the maximum value of that parameter in the dataset. Specifically, this can be achieved by using a data preprocessing module to perform dimensionless processing on the three types of parameters. This operation eliminates the interference of different physical dimensions on the model calculation. The weighting coefficient refers to the pre-set proportion of the influence of the three types of parameters in the evaluation model. Specifically, it can be obtained by training and optimizing historical data through machine learning algorithms. This coefficient is used to dynamically adjust the control priority of each parameter under different working conditions.

[0052] Specifically, when the steel pipes enter the sorting device, the monitoring module simultaneously collects diameter data, surface dirt images, and rotation speed information. The data processing module first normalizes the maximum diameter difference, average dirt density, and minimum rotation speed to generate corresponding diameter difference indices, dirt density indices, and minimum rotation speed indices. Subsequently, the evaluation model performs linear superposition calculations on the three indices according to preset weighting coefficients, outputting a surface treatment evaluation coefficient E. This coefficient reflects the comprehensive processing requirements of the current steel pipe group in real time: when the diameter difference is large, the E value increases to improve sorting accuracy compensation; when the dirt density is high or the rotation speed is low, the E value increases to enhance the grinding force. The pressure adjustment model combines the current extrusion pressure with the E value to generate a target extrusion pressure command. The control module adjusts the extension and retraction of the electric push rod 26 accordingly, so that the pressure of the roller plate 54 dynamically matches the actual working conditions.

[0053] Compared to existing technologies, traditional steel pipe sorting equipment can only control the grinding intensity based on a single parameter (such as a fixed pressure threshold), failing to address the combined effects of different diameters, dirt conditions, and movement states. This solution, however, constructs a multi-parameter fusion evaluation model, transforming dimensional dispersion, dirt adhesion, and movement resistance into a unified control basis, achieving adaptive adjustment of the extrusion pressure. This data-fusion-based dynamic control mechanism overcomes the problem of fluctuating processing results caused by the fixed parameters of traditional equipment.

[0054] Through the above technical solution, this application can automatically adjust the surface grinding pressure according to the real-time status of the steel pipe group. It enhances the sorting compensation capability when there are large diameter differences, increases the cleaning intensity when dirt adhesion is severe, and increases pressure to overcome frictional resistance when rotation is obstructed. This dynamic adjustment mechanism ensures that steel pipes of different specifications and surface conditions receive appropriate grinding treatment, avoiding dirt residue due to insufficient pressure or equipment overload due to excessive pressure, thereby maintaining stable sorting accuracy and processing efficiency under complex working conditions.

[0055] As a preferred embodiment of the present invention, the pressure regulation model is as follows: ; in The current compressive force is 54. For surface treatment evaluation coefficients, The target compressive force.

[0056] In this embodiment, the surface treatment evaluation coefficient is a value calculated comprehensively based on the differences in steel pipe diameter, surface dirt density, and minimum rotation speed. Specifically, a normalization formula can be used to standardize the maximum diameter difference, dirt density, and minimum rotation speed, and then a weighted summation can be used to generate the evaluation coefficient. This coefficient is used to quantify the priority of different steel pipe surface treatment requirements and serves as a benchmark parameter for extrusion pressure adjustment in the model. The current extrusion pressure of the roller plate 54 refers to the pressure value between the roller plate 54 and the steel pipe contact surface monitored in real time by a pressure sensor, which can be measured using a piezoelectric sensor or strain gauge sensor. This parameter serves as the input benchmark value for the pressure adjustment model, ensuring that the adjustment process has a real-time feedback basis. The target extrusion pressure refers to the target pressure value that needs to be applied to the roller plate 54 after model calculation. Specifically, pressure adjustment can be achieved by adjusting the extension and retraction of the electric push rod 26 through the control module. This parameter directly acts on the actuator to achieve dynamic pressure control.

[0057] Specifically, the pressure regulation model calculates the target extrusion pressure by linearly superimposing the surface treatment evaluation coefficient and the current extrusion pressure in real time. When the difference in steel pipe diameter increases, the surface dirt density increases, or the rotation speed decreases, the surface treatment evaluation coefficient increases accordingly, and the model automatically increases the target extrusion pressure to enhance the grinding intensity; conversely, it decreases the extrusion pressure to avoid over-extrusion. This regulation process is achieved through closed-loop linkage between the data processing module and the control module, ensuring that the pressure of the roller plate 54 is always dynamically matched with the actual state of the steel pipe.

[0058] Compared to existing technologies, traditional steel pipe sorting devices use a fixed pressure value for surface grinding, which cannot be dynamically adjusted according to differences in steel pipe diameter, degree of dirt adhesion, and movement. This solution constructs a pressure adjustment model, transforming multi-dimensional monitoring data into quantifiable adjustment parameters, enabling adaptive adjustment of the pressure value. This solves the problems of unstable cleaning effect and fluctuating sorting accuracy caused by the fixed pressure mode.

[0059] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A waste steel pipe sorting device for construction projects, comprising a sorting table, the sorting table being hollow in the middle, characterized in that, The sorting platform is equipped with a steel pipe limiting screening mechanism on its upper side, which can sort steel pipes of different diameters. A steel pipe intercepting screening mechanism is equipped on the lower side of the sorting platform, which can sort steel pipes of different lengths. A baffle is provided on the lower side of the steel pipe intercepting screening mechanism. A support is fixedly connected to the sorting platform, and the support can be connected to an external air filter box via a flexible hose. An electric telescopic rod is fixedly connected to the support, and a roller pressing mechanism is fixedly connected to the telescopic end of the electric telescopic rod. The roller pressing mechanism can simultaneously grind all steel pipes by cooperating with the steel pipe limiting screening mechanism. The platform also includes: The pressure regulation system can adjust the extrusion pressure on the steel pipe between the steel pipe limiting screening mechanism and the roller pressing mechanism during grinding, thereby controlling the sorting accuracy of steel pipes of different diameters. Support seats are provided on both sides of the upper surface of the sorting platform, and electric push rods are fixedly connected to each support seat. The roller pressing mechanism includes a fixed frame, a drive motor, a connecting seat, and a roller pressing plate; wherein the telescopic end of the electric telescopic rod is fixedly connected to the fixed frame, the connecting seat is slidably connected in the fixed frame, the drive motor is provided on the fixed frame, the output shaft of the drive motor is threadedly connected to the connecting seat, and the lower end of the connecting seat is inserted into the roller pressing plate. The control system includes a monitoring module, which can monitor the diameter of all steel pipes, the overall dirt density on the surface of all steel pipes, and the rotation speed of all steel pipes during grinding. Data processing module: It can construct a steel pipe surface treatment evaluation model based on the maximum diameter difference between all steel pipes, the overall dirt density on the surface of all steel pipes, and the minimum rotation speed of each steel pipe, and output the surface treatment evaluation coefficient; then, based on the current extrusion pressure on the roller plate and the surface treatment evaluation coefficient, it can construct a pressure adjustment model and output the target extrusion pressure. Control module: Based on the target extrusion pressure output by the pressure regulation model, the control module controls the electric push rod; The maximum diameter difference between all steel pipes, the overall dirt density on the surface of all steel pipes, and the minimum rotation speed of each steel pipe are substituted into the maximum value normalization formula for processing, and the diameter difference index, dirt density index and minimum rotation speed index are generated respectively. The evaluation model for steel pipe surface treatment is as follows: ; in , as well as These are the weighting coefficients for diameter difference, dirt density, and rotational speed, respectively. ,and , as well as All are greater than 0; The diameter difference index, The dirt density index, The lowest speed index, This is the surface treatment evaluation coefficient; The pressure regulation model is as follows: ; in This represents the current compressive force applied to the roller plate. For surface treatment evaluation coefficients, The target compressive force.

2. The waste steel pipe sorting device for construction projects according to claim 1, characterized in that, The steel pipe limiting screening mechanism includes a guide rod and a sliding seat; Each support base is fixedly connected to a guide rod, and multiple sliding seats are slidably connected through the guide rod. A spring is provided between each pair of adjacent sliding seats, and a limit wheel is rotatably connected between two sliding seats in the same row.

3. The waste steel pipe sorting device for construction projects according to claim 2, characterized in that, The steel pipe limiting screening mechanism also includes a push plate. The telescopic end of the electric push rod is fixedly connected to the push plate. The push plate is slidably connected to the guide rod, and the push plate can elastically abut against the outermost sliding seat.

4. The waste steel pipe sorting device for construction projects according to claim 1, characterized in that, The steel pipe interception and screening mechanism includes a bidirectional threaded rod, a movable seat, and a stop bar; The sorting table is fixedly connected to a bidirectional threaded rod, which has threads in opposite directions. Two movable seats are threadedly connected to the bidirectional threaded rod. The movable seats are slidably connected to the lower side of the sorting table. Each movable seat is fixedly connected to a stop bar. The two stop bars are located on the lower side of all the limit wheels, and both stop bars are perpendicular to the direction of each limit wheel.

5. The waste steel pipe sorting device for construction projects according to claim 2, characterized in that, A pressure sensor is provided between the roller plate and the lower end face of the connecting seat, and the roller plate is positioned above all the limit wheels.

6. The waste steel pipe sorting device for construction projects according to claim 1, characterized in that, The lower side of the roller plate is provided with multiple air intake ports, and each air intake port is connected to an air pump on the upper surface of the roller plate.

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