Polishing device for outer circle of PE (Poly Ethylene) pipe

Abstract

The invention is suitable for the technical field of pipe outer circle grinding, and provides a PE pipe outer circle grinding device which comprises a workbench, a grinding mechanism used for grinding a pipe is arranged on the workbench, a supporting frame is horizontally and slidably connected with a moving seat, and the supporting frame is fixedly connected with a second motor. An output shaft of the second motor is in threaded connection with a moving seat, the moving seat is fixedly connected with an electric lifting seat, and the telescopic end of the electric lifting seat is fixedly connected with a guide sleeve; the pipe polishing machine further comprises a feeding speed optimization system which can regulate and control the extension speed of the electric lifting seat by comprehensively evaluating the polishing state of the abrasive belt, the clamping state of the clamping mechanism and the stable state of the pipe, and then the feeding speed during pipe polishing is optimized. The feeding speed self-adaptive adjustment under the interference of multiple factors such as abrasive belt abrasion, pipe temperature change and clamping force fluctuation is achieved.

Description

Technical Field

[0001] This invention belongs to the field of pipe outer diameter grinding technology, and particularly relates to a PE pipe outer diameter grinding device. Background Technology

[0002] Ethylene (PE) pipes are widely used in water supply and drainage, gas transmission, and agricultural irrigation due to their excellent properties such as corrosion resistance, light weight, and long service life. In the production and repair of PE pipes, the grinding of their outer surface is a crucial process. This process aims to remove surface defects, oxide layers, or weld excess to obtain a uniform and smooth pipe wall, ensuring the quality of subsequent spraying, bonding, or installation.

[0003] Currently, most PE pipe external grinding devices on the market use abrasive belts or grinding wheels as grinding tools. These are driven by a motor at high speed, simultaneously rotating or linearly feeding the pipe to grind its external surface. However, these devices still have several limitations in practical applications, mainly in the following aspects: First, the grinding process has poor adaptability. Existing equipment mostly uses constant feed speed and grinding parameters, which cannot be dynamically adjusted according to real-time changes in the grinding conditions. For example, the abrasive belt gradually wears down during use, leading to a decrease in grinding efficiency; insufficient tension can cause the abrasive belt to slip, affecting the uniformity of grinding; and excessively high rotation speed of the pipe can easily cause vibration, leading to a deterioration in grinding accuracy. Fixed parameters cannot cope with these dynamic changes, often resulting in under-grinding or over-grinding, affecting the processing quality.

[0004] Secondly, the clamping stability is insufficient. PE pipes are relatively soft and have poor rigidity, making them prone to bending deformation and vibration under grinding stress. Traditional clamping mechanisms often only provide simple radial clamping force, which is insufficient to maintain the pipe's stable centering under high-speed rotation and grinding reaction forces. This leads to increased pipe roundness deviation, and even ellipticization or surface vibration marks, seriously affecting the grinding accuracy of the outer circle.

[0005] Furthermore, there is a lack of intelligent process monitoring and feedback. The heat generated during the grinding process can easily soften or even melt the surface of the PE pipe, causing material adhesion or surface damage; at the same time, minor deformations and dents in the pipe are difficult to detect in real time. Most existing devices lack a comprehensive monitoring system for key parameters (such as abrasive belt condition, clamping force, pipe temperature, deformation, etc.), making it impossible to effectively assess the grinding status, let alone perform closed-loop optimization control of key parameters such as feed rate based on the assessment results.

[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 PE pipe outer diameter grinding device, which aims to solve the problem that common PE pipe outer diameter grinding devices on the market lack intelligent process monitoring and feedback.

[0008] The present invention is implemented as follows: a PE pipe outer circle grinding device includes a worktable, and a grinding mechanism for grinding the pipe is provided on the worktable. The grinding mechanism includes a sanding belt, which can grind the pipe by continuously moving horizontally. A support frame is fixedly mounted on the workbench. A movable seat is horizontally slidably connected to the support frame. A second motor is fixedly connected to the support frame. The output shaft of the second motor is threadedly connected to the movable seat. An electric lifting seat is fixedly connected to the movable seat. A guide sleeve is fixedly connected to the telescopic end of the electric lifting seat. A clamping mechanism is provided inside the guide sleeve. The clamping mechanism can clamp the pipe. A third motor is fixedly connected to the guide sleeve. The third motor can drive the clamping mechanism to rotate. The system also includes: The feed speed optimization system can regulate the extension speed of the electric lifting seat by comprehensively evaluating the grinding state of the abrasive belt, the clamping state of the clamping mechanism, and the stability state of the pipe, thereby optimizing the feed speed during pipe grinding.

[0009] Further technical solutions, such as the feed rate optimization system, include: The grinding status monitoring module can construct a grinding status monitoring model based on the tension of the sanding belt, surface wear, and moving linear speed, and output a grinding efficiency evaluation coefficient. The clamping status assessment module can construct a clamping status assessment model based on the clamping area, clamping force, and vibration frequency of the clamping mechanism on the pipe, and output the clamping status assessment coefficients. The pipe stability assessment module can construct a stability assessment model based on the pipe's rotation speed, clamping state assessment coefficient, and horizontal distance between the grinding mechanism and the clamping mechanism during grinding, and output the stability assessment coefficient. The pipe deformation state monitoring module can construct a deformation state monitoring model based on the surface temperature, bending angle and the area of ​​the depression at the grinding position of the pipe during grinding, and output the deformation state evaluation coefficient. The pipe grinding efficiency-precision control module constructs a pipe grinding efficiency-precision control model based on the grinding efficiency evaluation coefficient, the stable state evaluation coefficient, and the deformation state evaluation coefficient, and outputs the grinding efficiency-precision coordination coefficient. The pipe feed speed adjustment module constructs a pipe feed speed adjustment model based on the standard feed speed of the pipe to the sanding belt and the grinding efficiency-precision coordination coefficient, and outputs the target feed speed of the pipe.

[0010] In a further technical solution, the grinding mechanism also includes two sliding seats, both of which are slidably connected to the upper end surface of the worktable. Both sliding seats are rotatably connected to limit rollers, and the two limit rollers together tension and fix the sanding belt. One of the sliding seats is fixedly connected to a No. 1 motor, and the output shaft of the No. 1 motor is fixedly connected to one of the limit rollers. The bottom surface of the worktable is fixedly connected to a dual-axis motor, and the two output shafts of the dual-axis motor are provided with threads in opposite directions. The two output shafts of the dual-axis motor are respectively threaded to the two sliding seats.

[0011] In a further technical solution, the clamping mechanism includes a rotating sleeve, an electric push rod, and a clamp; The rotating sleeve is rotatably connected to the inner wall of the guide sleeve. Multiple electric push rods are fixedly distributed on the inner wall of the rotating sleeve. The telescopic ends of the electric push rods are all fixedly connected to clamps. A limit assembly is provided in the middle of the rotating sleeve.

[0012] In a further technical solution, the limiting component includes a limiting rod, an airbag, and an air pump; A limit rod is fixedly connected to the center of the inner end face of the No. 3 motor workbench. Multiple air bladders are connected inside the limit rod. An air pump is fixedly connected to the inner end face of the rotating sleeve. The air pump is connected to the inside of the limit rod.

[0013] A further technical solution is to normalize the tension, surface wear, and linear velocity of the abrasive belt using the maximum-minimum normalization method, and then obtain the tension index, wear index, and linear velocity index of the abrasive belt after calculation. The grinding status monitoring model includes: ; in as well as All are weighting coefficients, and ; as well as Greater than ; Tension index, The wear index, The linear velocity index, This is a coefficient for evaluating grinding efficiency.

[0014] A further technical solution is to normalize the real-time clamping area, clamping force, and vibration frequency using the maximum-minimum normalization method, and obtain the clamping area index, clamping force index, and vibration frequency index after calculation. The clamping state evaluation model includes: ; in as well as All are weighting coefficients, and ; as well as All greater than ; The clamping area index, This is the clamping force index. The frequency index is the oscillation index. This is the clamping state evaluation coefficient.

[0015] A further technical solution is to normalize the rotation speed of the pipe and the horizontal distance between the grinding mechanism and the clamping mechanism by using the maximum-minimum normalization method, and obtain the rotation speed index and the distance index after calculation. The steady-state assessment models include: ; in All are gain coefficients, and All greater than ; This is the clamping state evaluation coefficient. The speed index, The spacing index, This is the steady-state evaluation coefficient.

[0016] A further technical solution is to normalize the surface temperature, bending angle and the area of ​​the grinding position of the pipe by using the maximum-minimum normalization method, and obtain the surface temperature index, bending angle index and the area of ​​the grinding position of the pipe after calculation. The deformation state monitoring model includes: ; in as well as All are weighting coefficients, and , as well as All greater than ; Surface temperature index The bending angle index. The area index of the depression. This is the deformation state evaluation coefficient.

[0017] Further technical solutions, including the pipe grinding efficiency-precision control model, include: ; in This is the gain coefficient. For steady-state evaluation coefficients, The deformation state evaluation coefficient is... The efficiency-precision synergy coefficient for grinding.

[0018] Further technical solutions, including the pipe feed speed adjustment model, include: ; in It is a non-linear adjustment index. , This is the standard feed rate for the pipe. The efficiency-precision synergy coefficient for grinding. The target feed rate for the pipe.

[0019] Compared with the prior art, the beneficial effects of the present invention are as follows: This application achieves real-time matching of grinding parameters with changes in working conditions. The wear state of the abrasive belt is promptly detected and reflected in the feed speed adjustment, avoiding uneven grinding caused by deterioration of the abrasive belt performance. The combination of vibration monitoring and stability assessment of the clamping mechanism significantly reduces radial runout errors during pipe processing. Real-time monitoring of pipe surface temperature and deformation effectively prevents dimensional deviations caused by material overheating and softening. A multi-parameter collaborative optimization mechanism ensures a dynamic balance between grinding efficiency and accuracy, solving the technical challenge of insufficient adaptability of traditional equipment under complex working conditions.

[0020] This application enables real-time quantitative assessment of the pipe's stability during grinding, preventing bending deformation and vibration caused by loose clamping, excessive rotation speed, or excessive spacing. For example, when a decrease in the clamping state assessment coefficient is detected, the feed rate optimization system automatically increases the gain coefficient to strengthen the suppression effect of rotation speed and spacing on stability, and promptly reduces the feed rate to prevent the generation of vibration marks on the pipe surface. When the clamping state assessment coefficient is high and the spacing is small, the feed rate optimization system can appropriately increase the feed rate without affecting grinding accuracy, thereby improving grinding efficiency while ensuring processing quality.

[0021] This application achieves adaptive adjustment of feed speed under various disturbances, including belt wear, pipe temperature changes, and clamping force fluctuations. When insufficient belt tension leads to decreased grinding efficiency, the system automatically increases the feed speed to maintain grinding efficiency. When the pipe surface temperature rises, causing softening and deformation, the speed control model dynamically suppresses the feed amount through a coordination coefficient to prevent material adhesion damage. When increased vibration of the clamping mechanism affects machining accuracy, a nonlinear adjustment mechanism can quickly reduce the feed speed to maintain the rotational stability of the pipe. This solution solves the problem of grinding quality fluctuations caused by fixed parameters in traditional equipment, maintaining synergistic optimization of efficiency and accuracy under complex working conditions. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the structure of the present invention; Figure 2This is a schematic diagram of the grinding mechanism in this invention; Figure 3 This is a schematic diagram of the clamping mechanism in this invention; Figure 4 This is a schematic diagram showing the connection between motor No. 3 and the rotating sleeve; Figure 5 A schematic diagram of the principle of the feed rate optimization system.

[0023] In the attached diagram: 1. Worktable; 2. Grinding mechanism; 21. Sliding seat; 22. Limiting roller; 23. Sanding belt; 24. Motor No. 1; 25. Dual-axis motor; 3. Support frame; 4. Moving seat; 5. Motor No. 2; 6. Electric lifting seat; 7. Guide sleeve; 8. Clamping mechanism; 81. Rotating sleeve; 82. Electric push rod; 83. Fixture; 84. Limiting assembly; 841. Limiting rod; 842. Airbag; 843. Air pump; 9. Motor No. 3. Detailed Implementation

[0024] 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.

[0025] The specific implementation of the present invention will be described in detail below with reference to specific embodiments.

[0026] like Figures 1-5 As shown, a PE pipe outer circle grinding device provided in an embodiment of the present invention includes a worktable 1, and a grinding mechanism 2 for grinding the pipe is provided on the worktable 1. The grinding mechanism 2 includes a sanding belt 23, which can grind the pipe by continuously moving horizontally. A support frame 3 is fixedly mounted on the workbench 1. A movable seat 4 is horizontally slidably connected to the support frame 3. A second motor 5 is fixedly connected to the support frame 3. The output shaft of the second motor 5 is threadedly connected to the movable seat 4. An electric lifting seat 6 is fixedly connected to the movable seat 4. A guide sleeve 7 is fixedly connected to the telescopic end of the electric lifting seat 6. A clamping mechanism 8 is provided inside the guide sleeve 7. The clamping mechanism 8 can clamp the pipe. A third motor 9 is fixedly connected to the guide sleeve 7. The third motor 9 can drive the clamping mechanism 8 to rotate. The system also includes: The feed speed optimization system can regulate the extension speed of the electric lifting seat 6 by comprehensively evaluating the grinding state of the sanding belt 23, the clamping state of the clamping mechanism 8, and the stability state of the pipe, thereby optimizing the feed speed during pipe grinding.

[0027] The feed rate optimization system includes: The grinding status monitoring module can construct a grinding status monitoring model based on the tension, surface wear, and linear speed of the sanding belt 23, and output a grinding efficiency evaluation coefficient. The clamping status assessment module can construct a clamping status assessment model based on the clamping area, clamping force, and vibration frequency of the clamping mechanism 8 on the pipe, and output the clamping status assessment coefficient. The pipe stability assessment module can construct a stability assessment model based on the pipe's rotation speed, clamping state assessment coefficient, and horizontal distance between the grinding mechanism 2 and the clamping mechanism 8 during grinding, and output the stability assessment coefficient. The pipe deformation state monitoring module can construct a deformation state monitoring model based on the surface temperature, bending angle and the area of ​​the depression at the grinding position of the pipe during grinding, and output the deformation state evaluation coefficient. The pipe grinding efficiency-precision control module constructs a pipe grinding efficiency-precision control model based on the grinding efficiency evaluation coefficient, the stable state evaluation coefficient, and the deformation state evaluation coefficient, and outputs the grinding efficiency-precision coordination coefficient. The pipe feed speed adjustment module constructs a pipe feed speed adjustment model based on the standard feed speed of the pipe to the sanding belt 23 and the grinding efficiency-precision coordination coefficient, and outputs the target feed speed of the pipe.

[0028] In this embodiment, the feed speed optimization system refers to an intelligent control system that collects real-time data from the abrasive belt 23, clamping mechanism 8, and pipe through a sensor network, and performs multi-dimensional analysis through a data processing module. Specifically, it can be implemented using an industrial computer in conjunction with detection devices such as pressure sensors, accelerometers, and infrared thermometers. The tension detection of the abrasive belt 23 in the grinding status monitoring module can be achieved through a tension sensor, and the surface wear assessment can be performed by periodically analyzing the texture changes of the abrasive belt 23 during downtime after grinding completion using a vision inspection system. The vibration frequency detection in the clamping status assessment module is completed using a triaxial accelerometer mounted on the clamping mechanism 8. The horizontal spacing measurement in the pipe stability status assessment module uses a laser rangefinder to obtain the real-time positional relationship between the grinding mechanism 2 and the clamping mechanism 8. The bending angle detection in the deformation status monitoring module is achieved through an angle encoder arranged at the pipe support points.

[0029] Specifically, during operation, the abrasive belt 23 performs circumferential grinding on the rotating pipe as it moves horizontally. The electric lifting seat 6 adjusts the feed speed according to the optimization system instructions, ensuring the pipe contacts the abrasive belt 23 at the optimal rate. The grinding status monitoring module calculates the efficiency coefficient of the abrasive belt 23 in real time, automatically reducing its weight when wear intensifies. The clamping status evaluation module continuously monitors the status of the clamp 83, triggering a warning signal when the vibration frequency exceeds the standard. The stability status evaluation module combines rotational speed and mechanism spacing to predict potential offset risks. The deformation monitoring module automatically reduces the feed speed to prevent material softening when it detects an abnormal temperature rise. The efficiency-precision control module nonlinearly fuses various evaluation coefficients to generate a dynamic adjustment coefficient. The feed speed adjustment module exponentially adjusts the standard speed based on this coefficient, maximizing grinding efficiency while ensuring accuracy.

[0030] Compared with existing technologies, this solution overcomes the limitations of single-parameter adjustment. Traditional equipment adjusts the feed speed only based on the rotation speed of the sanding belt 23, while this solution establishes a coupled evaluation model of the sanding belt 23 state, clamping stability, and pipe deformation. Existing technologies only monitor the clamping force of the clamping mechanism 8; this solution adds vibration frequency detection, enabling early identification of resonance risks. Compared to fixed threshold alarm methods, this solution employs a dynamic weight allocation mechanism, automatically adjusting the influence weight of each parameter according to the operating conditions. Compared to conventional PID control, this solution's exponential adjustment strategy responds more rapidly under abnormal operating conditions, effectively avoiding over-wearing or under-wearing.

[0031] Through the above technical solutions, this application achieves real-time matching of grinding parameters with changes in working conditions. The wear state of the abrasive belt 23 is promptly detected and reflected in the feed speed adjustment, avoiding uneven grinding caused by the deterioration of the abrasive belt 23's performance. The combination of vibration monitoring and stability assessment of the clamping mechanism 8 significantly reduces radial runout errors during pipe processing. Real-time monitoring of pipe surface temperature and deformation effectively prevents dimensional deviations caused by material overheating and softening. The multi-parameter collaborative optimization mechanism ensures a dynamic balance between grinding efficiency and accuracy, solving the technical problem of insufficient adaptability of traditional equipment under complex working conditions.

[0032] like Figure 2 As shown, in a preferred embodiment of the present invention, the grinding mechanism 2 further includes two sliding seats 21, both of which are slidably connected to the upper end face of the worktable 1. Both sliding seats 21 are rotatably connected to limit rollers 22, and the two limit rollers 22 together tension and fix the sanding belt 23. One of the sliding seats 21 is fixedly connected to a No. 1 motor 24, and the output shaft of the No. 1 motor 24 is fixedly connected to one of the limit rollers 22. The bottom surface of the worktable 1 is fixedly connected to a dual-axis motor 25, and the two output shafts of the dual-axis motor 25 are provided with threads in opposite directions, and the two output shafts of the dual-axis motor 25 are respectively threaded to the two sliding seats 21.

[0033] In this embodiment, when the tension of the sanding belt 23 decreases due to wear or temperature changes, the dual-axis motor 25 starts and drives the two reverse-threaded output shafts to rotate, causing the two sliding seats 21 to move synchronously in opposite directions along the guide rail of the worktable 1, thereby increasing the distance between the limiting rollers 22 to restore the tension of the sanding belt 23. During this process, the sanding belt 23 is always kept in a horizontal linear motion trajectory by the two limiting rollers 22 to avoid deviation caused by unilateral adjustment. At the same time, the first motor 24 continuously drives the limiting rollers 22 to rotate, driving the sanding belt 23 to move at a constant linear speed to ensure uniform grinding contact surface. When it is necessary to adjust the movement direction of the sanding belt 23, the rotation direction of the dual-axis motor 25 can be reversed to achieve synchronous inward retraction of the two sliding seats 21, thereby shortening the distance between the limiting rollers 22 and reducing the tension of the sanding belt 23.

[0034] Through the above technical solution, this application achieves dynamic balance adjustment of the tension of the abrasive belt 23, automatically compensating for the wear of the abrasive belt 23 during continuous grinding and maintaining the stability of the contact pressure between the abrasive belt 23 and the pipe. The synchronous reverse movement mechanism of the double sliding seats 21 avoids the center offset of the abrasive belt 23, ensuring that the grinding area always covers the outer surface of the pipe. The reverse threaded drive structure transforms the unidirectional rotation of the motor into bidirectional symmetrical displacement, simplifying the complexity of the mechanical transmission and improving the adjustment accuracy and response speed.

[0035] like Figure 3 As shown, in a preferred embodiment of the present invention, the clamping mechanism 8 includes a rotating sleeve 81, an electric push rod 82, and a clamp 83; The rotating sleeve 81 is rotatably connected to the inner wall of the guide sleeve 7. Multiple electric push rods 82 are fixedly distributed on the inner wall of the rotating sleeve 81. Each electric push rod 82 has a clamp 83 fixedly connected to its telescopic end. A limit assembly 84 is provided in the middle of the rotating sleeve 81.

[0036] In this embodiment, the rotating sleeve 81 drives the clamped pipe to rotate synchronously through rotational motion, providing basic rotational power for the sanding belt 23. Multiple circumferentially distributed electric push rods 82 independently extend and retract to adjust the radial position of each clamping point, forming a dynamically adjustable multi-point contact clamping system, ensuring uniform circumferential clamping force distribution for pipes of different diameters or ellipticities. The contact surface between the clamp 83 and the outer wall of the pipe prevents relative slippage by increasing the coefficient of friction, while also avoiding plastic deformation caused by localized stress concentration. The limiting assembly 84 is inserted into the center of the pipe via a rigid limiting rod 841, and, combined with the airbag 842 driven by the air pump 843, expands to fill the gap in the inner wall of the pipe, eliminating rotational imbalance caused by clamping eccentricity.

[0037] Through the above technical solution, this application can automatically adjust the number and position of clamping contact points according to the outer diameter of the pipe, eliminate the roundness deviation caused by uneven clamping force, and eliminate the rotational imbalance caused by clamping eccentricity through axial limiting, thereby maintaining the geometric axis stability of the pipe during high-speed rotation and significantly reducing the probability of surface vibration marks.

[0038] like Figure 3 As shown, in a preferred embodiment of the present invention, the limiting component 84 includes a limiting rod 841, an airbag 842, and an air pump 843. A limiting rod 841 is fixedly connected to the center of the inner end face of the workbench 1 of the No. 3 motor 9. Multiple airbags 842 are connected inside the limiting rod 841. An air pump 843 is fixedly connected to the inner end face of the rotating sleeve 81. The air pump 843 is connected to the inside of the limiting rod 841.

[0039] In this embodiment, the limiting rod 841 is rigidly fixed to the center of the motor workbench 1. Airbags 842 are evenly distributed circumferentially along the limiting rod 841. After inflation, they expand and adhere to the inner wall of the pipe, forming multi-point elastic support. The deformation of the airbags 842 compensates for the ellipticity error of the pipe. The air pump 843 dynamically balances the centrifugal force and grinding reaction force generated during pipe rotation by adjusting the internal air pressure of the airbags 842: when increased pipe vibration is detected, the air pump 843 increases the pressure to enhance the support stiffness of the airbags 842 to suppress vibration; when the pipe expands due to heat, the air pump 843 depressurizes to prevent overpressure of the airbags 842 from causing pipe deformation. This structure, through the synergistic effect of rigid limiting and flexible support, forms a closed-loop control between maintaining axial positioning accuracy and adjusting radial dynamic support.

[0040] Compared with existing technologies, traditional clamping mechanisms 8 rely solely on mechanical clamps 83 for rigid clamping, which cannot adapt to pipe deformation and is prone to stress concentration. This solution transforms a single mechanical clamping into a dynamically adjustable elastic support system through the combination of airbags 842 and air pumps 843: the distributed layout of airbags 842 evens out the support force and avoids local overload; the real-time pressure adjustment function of air pumps 843 enables the support stiffness to dynamically match the working conditions, overcoming the problem of pipe plastic deformation caused by traditional rigid clamping.

[0041] As a preferred embodiment of the present invention, the tension, surface wear and linear velocity of the sanding belt 23 are normalized by the maximum-minimum normalization method, and the tension index, wear index and linear velocity index of the sanding belt 23 are obtained after calculation. The grinding status monitoring model includes: ; in as well as All are weighting coefficients, and , as well as Greater than ; Tension index, The wear index, The linear velocity index, This is a coefficient for evaluating grinding efficiency.

[0042] In this embodiment, the maximum-minimum normalization method refers to a standardization processing method that maps the original parameter values ​​to a range of 0 to 1. Specifically, this can be achieved by linearly transforming real-time data collected by sensors based on preset maximum and minimum values. This method can eliminate the incomparability between parameters of different dimensions. The tension index is a quantitative indicator reflecting the tightness of contact between the abrasive belt 23 and the pipe. Specifically, it can be achieved by measuring the lateral tension of the abrasive belt 23 using a tension sensor and performing normalization calculations based on a preset safe tension range. This index is used to characterize the risk of slippage of the abrasive belt 23. The wear index is a quantitative indicator reflecting the degree of abrasive grain shedding from the surface of the abrasive belt 23. Specifically, it can be achieved by periodically analyzing the surface texture density of the abrasive belt 23 during the downtime after grinding using a visual inspection system and performing normalization calculations based on the initial wear baseline value. This index is used to assess the attenuation of the cutting ability of the abrasive belt 23. The linear speed index is a quantitative indicator reflecting the grinding amount per unit time of the abrasive belt. Specifically, it can be calculated by measuring the speed of motor 24 using an encoder, combining this with the circumference of the abrasive belt 23 to determine the actual linear speed, and then normalizing it according to a preset maximum linear speed. This index characterizes instantaneous grinding efficiency. The weighting coefficient refers to the contribution ratio of each normalized parameter to the final evaluation coefficient. This can be achieved through training with historical data or setting fixed values ​​based on expert experience. This coefficient is used to balance the priority relationship between tension maintenance, wear compensation, and linear speed optimization.

[0043] Specifically, the tension of the abrasive belt 23 is collected in real time by a tension sensor. When the detected tension is below a threshold, the normalized tension index will decrease significantly. At this time, the model automatically increases the weight of this parameter to strengthen the priority of tension control. The wear degree of the abrasive belt 23 is periodically scanned by a vision inspection system to detect the distribution of abrasive particles on the surface. When the area of ​​the wear region exceeds a preset proportion, the wear index increases, causing the value of (1-W) to decrease, prompting the grinding status monitoring model to reduce its dependence on wear parameters. The linear speed of the abrasive belt 23 is controlled in a closed loop by an encoder and motor 24. When the pipe diameter changes and the linear speed needs to be adjusted, the normalized linear speed index is updated in real time and input into the model. After the three sets of normalized parameters are weighted and summed, the output grinding efficiency evaluation coefficient can dynamically reflect the comprehensive working status of the abrasive belt 23. When the coefficient is below a set threshold, the feed speed adjustment module is triggered to reduce the feed amount, thereby avoiding the decline in grinding quality caused by the deterioration of the abrasive belt 23.

[0044] Through the above technical solution, this application achieves dynamic comprehensive evaluation of the grinding state of the abrasive belt 23, effectively solving the problem of grinding efficiency fluctuation caused by changes in the state of the abrasive belt 23. Through normalization processing and weight allocation mechanism, it can accurately identify key state changes such as decreased tension, increased wear, or abnormal linear speed of the abrasive belt 23, providing real-time data support for feed speed control, thereby ensuring the stability of the grinding process and the consistency of processing quality.

[0045] As a preferred embodiment of the present invention, the real-time clamping area, clamping force and vibration frequency of the clamping mechanism 8 are normalized by the maximum-minimum normalization method, and the clamping area index, clamping force index and vibration frequency index of the clamping mechanism 8 are obtained after calculation. The clamping state evaluation model includes: ; in as well as All are weighting coefficients, and , as well as All greater than ; The clamping area index, This is the clamping force index. The frequency index is the oscillation index. This is the clamping state evaluation coefficient.

[0046] In this embodiment, the maximum-minimum normalization method refers to a standardization method that linearly transforms the original data to the [0,1] interval. Specifically, this can be achieved by using sensors to collect real-time data on clamping area, clamping force, and vibration frequency. The clamping area index refers to the normalized proportion of the clamping contact area, which can be detected by a pressure sensor array to measure the actual contact area between the clamping mechanism 8 and the pipe, reflecting the uniformity of clamping. The clamping force index refers to the normalized clamping force value, which can be measured in real-time by a force sensor to measure the applied force of the clamping mechanism 8, characterizing the clamping mechanism 8's resistance to pipe displacement. The vibration frequency index refers to the normalized vibration frequency value, which can be obtained by collecting the vibration signal of the clamping mechanism 8 using an accelerometer and extracting the dominant frequency component, used to quantify the stability during dynamic clamping. Weighting coefficients. as well as This refers to the pre-set parameter allocation ratio. Specifically, the contribution of each parameter to clamping stability can be determined through experimental calibration or expert experience, and is used to balance the impact of clamping area, force and vibration on the comprehensive evaluation results.

[0047] Specifically, during the operation of the clamping mechanism 8, the contact area between the clamp 83 and the pipe is first detected in real time by a pressure sensor array, and converted into a clamping area index using the maximum-minimum normalization method. Simultaneously, a force sensor continuously collects the force data applied by the clamping mechanism 8, which is normalized to obtain a clamping force index. An accelerometer monitors the vibration state of the clamping mechanism 8, extracts the main vibration frequency through spectrum analysis, and calculates the vibration frequency index. Subsequently, the three normalized indices are substituted into the clamping state evaluation model and linearly weighted using preset weighting coefficients. In this process, the clamping area index and clamping force index directly reflect the static constraint capability of the clamping mechanism 8 on the pipe, while the vibration frequency index... The method transforms high-frequency vibration into a negative evaluation index. The final output clamping state evaluation coefficient can comprehensively characterize the real-time state of the clamping mechanism 8 in three dimensions: contact uniformity, anti-displacement capability, and dynamic stability, providing a quantitative basis for subsequent feed speed control.

[0048] Through the above technical solution, this application effectively solves the problem of decreased pipe processing accuracy caused by vibration, unstable clamping area and force of the clamping mechanism 8. By real-time monitoring and quantitative evaluation of the clamping status, abnormal working conditions such as uneven clamping contact, insufficient force, or excessive vibration can be detected in a timely manner, thereby dynamically adjusting the feed speed to avoid pipe deviation or vibration. While ensuring clamping stability, this solution reduces pipe ellipticity deviation and surface vibration defects caused by clamping failure, significantly improving the processing accuracy of outer diameter grinding.

[0049] As a preferred embodiment of the present invention, the rotation speed of the pipe and the horizontal distance between the grinding mechanism 2 and the clamping mechanism 8 are normalized by the maximum-minimum normalization method, and the rotation speed index and the distance index are obtained after calculation. The steady-state assessment models include: ; in All are gain coefficients, and All greater than ; This is the clamping state evaluation coefficient. The speed index, The spacing index, This is the steady-state evaluation coefficient.

[0050] In this embodiment, the maximum-minimum normalization method refers to a standardization method that maps the original parameter values ​​to a range of 0 to 1. Specifically, this can be achieved by subtracting the minimum value from the parameter value and then dividing by the difference between the maximum and minimum values, thus eliminating the incomparability between parameters of different dimensions. The rotational speed index refers to the relative value of the pipe's rotational speed after normalization, obtained, for example, by measuring the pipe's rotational speed in real time and calculating its ratio to a preset rotational speed range, used to characterize the degree of influence of rotational speed on stability. The spacing index refers to the relative value of the normalized horizontal spacing between the clamping mechanism 8 and the grinding mechanism 2, obtained, for example, by measuring the actual spacing and calculating its ratio to a safe spacing threshold, used to reflect the risk of reduced rigidity caused by excessive spacing. Gain coefficient. These are parameters used to adjust the weight ratio of the speed index and spacing index in the model. For example, they are set to specific values ​​based on experimental data or empirical values ​​to amplify or suppress the influence of the corresponding parameters on stability.

[0051] Specifically, the raw data of the pipe rotation speed and the distance between the clamping mechanism 8 and the grinding mechanism 2 are first input into the normalization processing module, and converted into a rotation speed index and a distance index within the range of 0 to 1 using the maximum-minimum normalization method. Clamping state evaluation coefficient. As a fundamental parameter, it reflects the effectiveness of the clamping mechanism 8 in securing the pipe. Rotational speed index The higher the gain coefficient, the closer the pipe rotation speed is to its limit, and the greater the risk of vibration. Used to amplify the negative impact of rotational speed on stability; Spacing index The larger the value, the farther the distance between the clamping point and the grinding point. Increased pipe overhang leads to decreased rigidity and a decrease in the gain coefficient. Used to reinforce the weakening effect of excessive spacing on stability. Stability evaluation coefficient. By comprehensively considering the dynamic changes in clamping reliability, rotational speed stability, and mechanism layout rationality through product relationships, when... When the feed rate falls below a set threshold, the feed rate adjustment module is triggered to reduce the feed rate, thereby suppressing vibration and deformation.

[0052] As a preferred embodiment of the present invention, the surface temperature, bending angle and the area of ​​the grinding position of the pipe are normalized by the maximum-minimum normalization method, and the surface temperature index, bending angle index and the area of ​​the grinding position of the pipe are obtained after calculation. The deformation state monitoring model includes: ; in as well as All are weighting coefficients, and , as well as All greater than ; Surface temperature index The bending angle index. The area index of the depression. This is the deformation state evaluation coefficient.

[0053] In this embodiment, surface temperature refers to the change in material surface temperature caused by the heat generated by the friction between the pipe and the abrasive belt 23 during the grinding process. Specifically, this can be achieved by using an infrared temperature sensor to collect real-time temperature data of the pipe's grinding area, used to quantify the degree of material softening due to heat. Bending angle refers to the axial offset angle of the pipe caused by uneven grinding reaction force or clamping force. Specifically, this can be achieved by arranging laser displacement sensors at both ends of the limiting rod 841 to measure the distance between the pipe's ends and the limiting rod 841 to determine the bending angle of the pipe. During the grinding process, the limiting rod 841 can remain stationary relative to the pipe, used to assess the impact of pipe bending deformation on roundness accuracy. Depression area refers to the area of ​​localized collapse in the grinding area caused by over-grinding or stress concentration. Specifically, a contact probe can be set on the limiting rod 841 corresponding to the clamping position, and the degree of depression on the inner wall of the pipe can be measured from the inside of the pipe using the contact probe, used to characterize the loss of surface smoothness. The maximum-minimum normalization method is a standardization method that linearly maps the original data to the [0,1] interval to eliminate dimensional differences. Specifically, it can be achieved by setting the historical maximum and minimum values ​​of each parameter for data transformation, ensuring the comparability of different parameters. Weighting coefficients. as well as This refers to the contribution ratio of each parameter in the deformation assessment, which can be dynamically adjusted according to process requirements or experimental data. For example, it can be increased in high-temperature environments. Strengthen the weight of temperature monitoring.

[0054] Specifically, during the polishing process, surface temperature, bending angle, and dent area are collected in real time by sensors and then normalized. The surface temperature index is generated by comparing the measured temperature with a preset safe temperature threshold; for example, when the temperature approaches the material's softening point, the temperature index approaches 1. The bending angle index is calculated by measuring the ratio of the pipe's axial offset to its maximum allowable bending amount; as the offset increases, the bending angle index increases accordingly. The dent area index is determined based on the proportion of the dented area to the total polished area; the larger the proportion, the higher the index value. The three normalized indices are input into the deformation state monitoring model, and a weighted sum is used to obtain the deformation state evaluation coefficient. Weighting coefficients as well as It can be dynamically configured according to different working conditions. For example, when grinding thin-walled pipes, the weight of the recessed area can be increased. To enhance the monitoring of surface integrity. When When the set threshold is exceeded, the system determines that there is a risk of deformation and triggers the feed speed adjustment, thereby reducing the grinding intensity before the material softens or deformation accumulates.

[0055] Through the above technical solution, this application achieves dynamic monitoring of the composite deformation risk during the grinding process of PE pipes, effectively avoiding material adhesion caused by local overheating, roundness deviations caused by bending deformation, and surface depressions caused by over-grinding. By normalization processing and weight allocation, the problem of multi-source heterogeneous data fusion is solved, making the deformation assessment results more consistent with actual working conditions. Furthermore, the assessment coefficients... This provides a quantitative basis for subsequent feed rate control, ensuring that the integrity of the pipe structure is protected while maintaining grinding efficiency.

[0056] As a preferred embodiment of the present invention, the pipe grinding efficiency-precision control model includes: ; in This is the gain coefficient. For steady-state evaluation coefficients, The deformation state evaluation coefficient is... The efficiency-precision synergy coefficient for grinding.

[0057] In this embodiment, during the polishing process, the stability evaluation coefficient is... As a numerator directly involved in the calculation, its larger value indicates more stable pipe rotation and more reliable clamping, thus allowing for a higher synergy coefficient. Value. In the denominator term and The product of these factors constitutes an efficiency suppression term, which occurs when the wear of the sand belt 23 intensifies or the linear velocity is too high. When the denominator increases, the value of the cooperability coefficient rises, forcing the cooperability coefficient to increase. This reduces the feed rate, thus limiting excessive increases in feed rate. At the same time, As a deformation compensation factor, this term applies when the pipe surface temperature increases, the bending angle increases, or the indentation area expands. An increase in the numerical value leads to a decrease in the value of this factor, further reducing the coefficient of cooperation. Through the dynamic coupling of the above parameters, the model can establish a nonlinear constraint relationship between the efficiency of the sand belt 23, the stability of the pipe and the risk of deformation, ensuring that when adjusting the feed speed, it can avoid over-wearing or vibration caused by excessive efficiency, and can also suppress the deterioration of accuracy caused by material softening or deformation in a timely manner.

[0058] Through the above technical solution, this application can dynamically adjust the upper limit of the feed speed according to the actual wear state of the abrasive belt 23, preventing under-grinding or repeated grinding caused by the decrease in the efficiency of the abrasive belt 23; by monitoring the deformation parameters of the pipe in real time, the feed speed is automatically reduced when the material softens or bends, avoiding surface melting or dimensional deviation caused by over-grinding; at the same time, by utilizing the synergistic effect of the efficiency suppression term and the stability coefficient, the utilization rate of the abrasive belt 23 is maximized while ensuring grinding accuracy, so as to achieve a balance between processing efficiency and surface quality.

[0059] As a preferred embodiment of the present invention, the pipe feed speed adjustment model includes: ; in It is a non-linear adjustment index. , This is the standard feed speed of the pipe to the sand belt 23. The efficiency-precision synergy coefficient for grinding. The target feed rate for the pipe.

[0060] In this embodiment, the standard feed speed refers to the preset reference moving rate when the pipe contacts the abrasive belt 23. This can be set using factory parameters or historical processing data to provide an initial reference for speed control. The nonlinear adjustment index is an index parameter used to amplify the effect of the grinding efficiency-precision synergy coefficient control. It can be a fixed value or dynamically adjusted according to material hardness; the larger the value, the more significant the impact of the grinding efficiency-precision synergy coefficient on speed. The grinding efficiency-precision synergy coefficient is a control parameter generated by comprehensively evaluating grinding efficiency, stable state, and deformation state. It can be obtained through multi-sensor data fusion calculation, and its value ranges from 0 to 1, characterizing the balance between efficiency and precision under the current working conditions.

[0061] Specifically, the model uses an exponential function to nonlinearly map the grinding efficiency-precision synergy coefficient to the standard feed rate. When the grinding efficiency-precision synergy coefficient approaches 1, the target feed rate quickly converges to the standard feed rate, at which point the system determines that grinding efficiency and precision have reached an optimal balance. When the grinding efficiency-precision synergy coefficient is below a set threshold, the exponential characteristic causes the target feed rate to decrease nonlinearly, suppressing the risk of over-grinding caused by abrasive belt wear or pipe deformation. The standard feed rate, as a benchmark parameter, together with the real-time calculated synergy coefficient, constitutes a two-factor control mechanism. This retains the fundamental role of empirical parameters while eliminating the adaptive defects caused by fixed parameters through dynamic compensation. The introduction of the nonlinear adjustment exponent allows the system to respond quickly through the exponential amplification effect when the synergy coefficient deviates from the ideal value, avoiding the problem of speed adjustment lag in traditional linear control.

[0062] Compared to existing technologies, current grinding devices typically employ fixed feed rates or linear adjustment strategies based on a single parameter, which cannot cope with the coupled effects of abrasive belt 23 state decay, pipe deformation, and clamping stability fluctuations. This solution, however, integrates multi-dimensional evaluation parameters into the speed control process through a nonlinear mathematical model, enabling dynamic adjustment of the feed rate based on real-time operating conditions. Compared to linear proportional adjustment methods, the exponential function significantly enhances the system's sensitivity to abnormal operating conditions, effectively suppressing over-grinding and vibration defects while ensuring grinding efficiency.

[0063] Through the above technical solution, this application achieves adaptive adjustment of the feed speed under the interference of multiple factors such as abrasive belt 23 wear, pipe temperature changes, and clamping force fluctuations. When insufficient tension of the abrasive belt 23 leads to a decrease in grinding efficiency, the system automatically increases the feed speed to ensure grinding efficiency; when the pipe surface temperature rises and causes softening deformation, the speed control model dynamically suppresses the feed amount through a coordination coefficient to prevent material adhesion damage; when the vibration of the clamping mechanism 8 intensifies and affects processing accuracy, the nonlinear adjustment mechanism can quickly reduce the feed speed to maintain the rotational stability of the pipe. This solution solves the problem of grinding quality fluctuations caused by parameter rigidity in traditional equipment, maintaining synergistic optimization of efficiency and accuracy under complex working conditions.

[0064] 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 PE pipe outer diameter grinding device, comprising a worktable, wherein a grinding mechanism for grinding the pipe is provided on the worktable, the grinding mechanism comprising a sanding belt, the sanding belt being capable of grinding the pipe by continuous horizontal movement; characterized in that: A support frame is fixedly mounted on the workbench. A movable seat is horizontally slidably connected to the support frame. A second motor is fixedly connected to the support frame. The output shaft of the second motor is threadedly connected to the movable seat. An electric lifting seat is fixedly connected to the movable seat. A guide sleeve is fixedly connected to the telescopic end of the electric lifting seat. A clamping mechanism is provided inside the guide sleeve. The clamping mechanism can clamp the pipe. A third motor is fixedly connected to the guide sleeve. The third motor can drive the clamping mechanism to rotate. The system also includes: The feed speed optimization system can regulate the extension speed of the electric lifting seat by comprehensively evaluating the grinding state of the abrasive belt, the clamping state of the clamping mechanism, and the stability state of the pipe, thereby optimizing the feed speed during pipe grinding.

2. The PE pipe outer diameter grinding device according to claim 1, characterized in that, The feed rate optimization system includes: The grinding status monitoring module can construct a grinding status monitoring model based on the tension of the sanding belt, surface wear, and moving linear speed, and output a grinding efficiency evaluation coefficient. The clamping status assessment module can construct a clamping status assessment model based on the clamping area, clamping force, and vibration frequency of the clamping mechanism on the pipe, and output the clamping status assessment coefficients. The pipe stability assessment module can construct a stability assessment model based on the pipe's rotation speed, clamping state assessment coefficient, and horizontal distance between the grinding mechanism and the clamping mechanism during grinding, and output the stability assessment coefficient. The pipe deformation state monitoring module can construct a deformation state monitoring model based on the surface temperature, bending angle and the area of ​​the depression at the grinding position of the pipe during grinding, and output the deformation state evaluation coefficient. The pipe grinding efficiency-precision control module constructs a pipe grinding efficiency-precision control model based on the grinding efficiency evaluation coefficient, the stable state evaluation coefficient, and the deformation state evaluation coefficient, and outputs the grinding efficiency-precision coordination coefficient. The pipe feed speed adjustment module constructs a pipe feed speed adjustment model based on the standard feed speed of the pipe to the sanding belt and the grinding efficiency-precision coordination coefficient, and outputs the target feed speed of the pipe.

3. The PE pipe outer diameter grinding device according to claim 1, characterized in that, The grinding mechanism also includes two sliding seats, both of which are slidably connected to the upper end face of the worktable. Both sliding seats are rotatably connected to limit rollers, and the two limit rollers together tension and fix the sanding belt. One of the sliding seats is fixedly connected to a No. 1 motor, and the output shaft of the No. 1 motor is fixedly connected to one of the limit rollers. The bottom surface of the worktable is fixedly connected to a dual-axis motor, and the two output shafts of the dual-axis motor are provided with threads in opposite directions. The two output shafts of the dual-axis motor are respectively threaded to the two sliding seats.

4. The PE pipe outer diameter grinding device according to claim 1, characterized in that, The clamping mechanism includes a rotating sleeve, an electric push rod, and a clamp; The rotating sleeve is rotatably connected to the inner wall of the guide sleeve. Multiple electric push rods are fixedly distributed on the inner wall of the rotating sleeve. The telescopic ends of the electric push rods are all fixedly connected to clamps. A limit assembly is provided in the middle of the rotating sleeve.

5. The PE pipe outer diameter grinding device according to claim 2, characterized in that, The tension, surface wear, and linear velocity of the abrasive belt were normalized using the maximum-minimum normalization method, and the tension index, wear index, and linear velocity index of the abrasive belt were obtained after calculation. The grinding status monitoring model includes: ； in as well as All are weighting coefficients, and , as well as Greater than ; Tension index, The wear index, The linear velocity index, This is a coefficient for evaluating grinding efficiency.

6. The PE pipe outer diameter grinding device according to claim 2, characterized in that, The real-time clamping area, clamping force, and vibration frequency were normalized using the maximum-minimum normalization method, and the clamping area index, clamping force index, and vibration frequency index were obtained after calculation. The clamping state evaluation model includes: ； in as well as All are weighting coefficients, and , as well as All greater than ; The clamping area index, This is the clamping force index. The frequency index is the oscillation index. This is the clamping state evaluation coefficient.

7. The PE pipe outer diameter grinding device according to claim 2, characterized in that, The rotation speed of the pipe and the horizontal distance between the grinding mechanism and the clamping mechanism were normalized by the maximum-minimum normalization method, and the rotation speed index and the distance index were obtained after calculation. The steady-state assessment models include: ； in All are gain coefficients, and All are greater than; This is the clamping state evaluation coefficient. The speed index, The spacing index, This is the steady-state evaluation coefficient.

8. The PE pipe outer diameter grinding device according to claim 2, characterized in that, The surface temperature, bending angle, and recess area of ​​the grinding position of the pipe were normalized by the maximum-minimum normalization method, and the surface temperature index, bending angle index, and recess area index of the pipe were obtained after calculation. The deformation state monitoring model includes: ； in as well as All are weighting coefficients, and , as well as All greater than , Surface temperature index The bending angle index. The area index of the depression. Deformation state evaluation coefficient.

9. The PE pipe outer diameter grinding device according to claim 2, characterized in that, The pipe grinding efficiency-precision control model includes: ； in This is the gain coefficient. For steady-state evaluation coefficients, The deformation state evaluation coefficient is... The efficiency-precision synergy coefficient for grinding.

10. The PE pipe outer diameter grinding device according to claim 2, characterized in that, The pipe feed speed adjustment model includes: ； in It is a non-linear adjustment index. , This is the standard feed rate for the pipe. The efficiency-precision synergy coefficient for grinding. The target feed rate for the pipe.

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