A control system for automatic sand replenishment of a diamond wire saw production line

Abstract

The application discloses a kind of diamond wire saw production line automatic sand replenishing control systems, to solve the low precision of existing sand replenishing system adjustment, the problem of large fluctuation of diamond wire particle adhesion amount caused by insufficient degree of automation, poor product consistency, including online detection unit, central control unit, man-machine interaction unit, drive adjustment unit and sand replenishing execution unit, online detection unit real-time detects diamond wire surface diamond particle adhesion amount and is transmitted to central control unit, central control unit compares operation after data preprocessing to detection information with preset target value, generates sand replenishing adjustment instruction and sends to drive adjustment unit, drive adjustment unit adjusts output power parameter to drive sand replenishing execution unit to change sand replenishing rate, man-machine interaction unit realizes control parameter input and system running state display.The application realizes the dynamic accurate adjustment of sand replenishing process by constructing closed-loop control system, effectively improves diamond wire saw product quality consistency.

Description

Technical Field

[0001] This invention belongs to the field of diamond wire manufacturing, and in particular relates to a control system for automatic sand replenishment in a diamond wire saw production line. Background Technology

[0002] Diamond wire saws are ultra-hard cutting tools made of high-strength, high-carbon steel wire with diamond abrasive particles attached through processes such as electroplating, resin bonding, or brazing. Compared to traditional slurry wire saws, they offer advantages such as higher cutting efficiency, lower material loss, higher processing precision, and less pollution, making them core consumables in precision manufacturing fields such as crystalline silicon photovoltaic slicing and semiconductor wafer processing. In recent years, the rapid development of downstream industries has driven up market demand, while increasingly stringent requirements have been placed on product cutting stability and batch consistency. The adhesion density and uniform distribution of diamond particles on the diamond wire surface are crucial factors determining its core performance.

[0003] Abrasive coating is a core process in diamond wire saw production. In mainstream electroplating abrasive coating processes, pre-treated steel wire passes through an abrasive coating tank under the influence of an electric field. Diamond particles are adsorbed onto the surface of the steel wire and fixed by a nickel plating layer. During production, the steel wire continuously carries away diamond particles from the tank, requiring real-time quantitative abrasive replenishment to maintain a stable abrasive concentration. Precise control of the replenishment amount directly determines the final particle adhesion density; insufficient or excessive replenishment will cause serious quality defects. Therefore, automation and precision in the replenishment process are crucial for ensuring the stability of the abrasive coating process and improving product quality consistency.

[0004] To replace the traditional manual sand replenishment method that relies on experience and reduce the labor intensity of operators, various automatic sand replenishment systems have been developed in the industry. However, existing automatic sand replenishment systems still have many technical shortcomings that urgently need to be addressed: some automatic sand replenishment systems can only achieve simple detection and sand replenishment linkage, without accurately processing the number of detected particles, and the sand replenishment adjustment method is singular, using only fixed frequency adjustment, unable to make gradient and fine adjustments according to subtle changes in the number of particles, resulting in large fluctuations in the number of particles on the diamond wire, making it difficult to maintain a stable state, thus affecting the product consistency of diamond wire saws and increasing the defect rate in the production process. In addition, existing systems lack convenient parameter setting and status monitoring methods, making it difficult for operators to quickly debug and maintain the equipment, further reducing production efficiency. Summary of the Invention

[0005] The purpose of this invention is to provide an automatic sand replenishment control system for diamond wire saw production lines, in order to solve the technical problems of existing diamond wire saw production line sand replenishment systems, which can only achieve open-loop linkage after simple detection and sand replenishment, have low adjustment accuracy, insufficient automation and inconvenient operation and maintenance, resulting in large fluctuations in the amount of diamond particles attached to the diamond wire surface, poor product consistency and low production efficiency.

[0006] To achieve the above objectives, the specific technical solution of the automatic sand replenishment control system for a diamond wire saw production line of the present invention is as follows:

[0007] An automatic sand replenishment control system for a diamond wire saw production line includes an online detection unit, a central control unit, a human-machine interaction unit, a drive adjustment unit, and a sand replenishment execution unit;

[0008] The online detection unit is used to detect the amount of diamond particles adhering to the surface of the diamond wire in the diamond wire saw production line in real time, and transmits the detected particle adhesion information to the central control unit in real time.

[0009] The human-machine interaction unit is bidirectionally connected to the central control unit, and is used to input control parameters and operation commands to the central control unit, and to receive and display system operation status information fed back by the central control unit.

[0010] The central control unit is communicatively connected to the online detection unit and the drive adjustment unit, respectively. It is used to receive particle adhesion information transmitted by the online detection unit, perform data preprocessing on the information and compare it with the preset target particle adhesion amount, generate corresponding sand replenishment adjustment instructions based on the comparison results and send them to the drive adjustment unit.

[0011] The output end of the drive adjustment unit is connected to the sand replenishment execution unit for adjusting the output power parameters according to the received sand replenishment adjustment command;

[0012] The sand replenishment execution unit adjusts the sand replenishment rate according to the power output by the drive adjustment unit, thereby dynamically adjusting the amount of diamond particles attached to the diamond wire so that the amount of particles attached meets the preset target.

[0013] As a further improvement of the present invention, the online detection unit includes an image acquisition component and an image processing component. The image acquisition component is installed above the diamond wire saw production line to acquire image information of the diamond wire surface in real time. The image processing component identifies and analyzes the acquired images, counts the number of diamond particles on the diamond wire within a unit length, and generates particle adhesion information.

[0014] As a further improvement of the present invention, the image acquisition component includes an industrial camera and a microscope head, wherein the high-definition industrial camera and the microscope head are coaxially assembled, and the optical axis of the microscope head is perpendicular to the plane in which the diamond wire runs.

[0015] As a further improvement of the present invention, the central control unit includes a programmable logic controller (PLC), which is connected to the drive adjustment unit via an industrial bus and sends adjustment commands, start / stop commands, and fault reset commands to the drive adjustment unit.

[0016] As a further improvement of the present invention, the human-machine interaction unit includes a touch screen display. The control parameters set through the touch screen display include the target particle adhesion amount, basic power parameters, particle adhesion amount gradient range, and power adjustment values ​​corresponding to each gradient range. The system operation status information displayed through the touch screen display includes real-time particle adhesion amount, current power parameters, working status of the sand replenishment execution unit, and system operation mode.

[0017] As a further improvement of the present invention, the drive adjustment unit includes a frequency converter and a variable frequency speed control motor; the input end of the frequency converter is communicatively connected to the central control unit, and the output end is electrically connected to the variable frequency speed control motor, adjusting the output frequency according to the adjustment command of the central control unit; the output shaft of the variable frequency speed control motor is drively connected to the sand replenishment execution unit, and its rotational speed corresponds to the sand replenishment rate of the sand replenishment execution unit; the frequency converter adopts a speed closed-loop control mode, correcting the output frequency by collecting the actual speed feedback signal of the variable frequency speed control motor.

[0018] As a further improvement of the present invention, the sand replenishment execution unit is a spiral sand feeding device, and the spiral conveying shaft of the spiral sand feeding device is coaxially connected to the output end of the drive adjustment unit.

[0019] As a further improvement of the present invention, the central control unit performs gradient average filtering on the particle adhesion information, and adopts a multi-cycle continuous sampling averaging method. The sampling period and the number of averages are set by the human-computer interaction unit.

[0020] As a further improvement of the present invention, the central control unit generates sand replenishment adjustment commands using gradient interval matching logic. Taking the target particle adhesion amount as the center, multiple continuous and non-overlapping particle adhesion amount gradient intervals are divided on both sides above and below it. Each gradient interval corresponds to a preset power adjustment value. The central control unit matches the pre-processed real-time particle adhesion amount with the gradient intervals to determine the corresponding power adjustment value. The target power parameters are calculated by matching the basic power parameters with the corresponding power adjustment value, and the sand replenishment adjustment command is generated.

[0021] As a further improvement of the present invention, the central control unit has a built-in data storage module for storing real-time particle adhesion curves, power parameter operation records, control parameter modification logs and fault alarm information during the production process, and supports historical data query and export.

[0022] Beneficial effects:

[0023] This invention acquires real-time information on the amount of diamond particles adhering to the surface of diamond wire through an online detection unit. After data preprocessing and target value comparison by the central control unit, a targeted sand replenishment adjustment command is generated. This command drives the adjustment unit and the sand replenishment execution unit to respond collaboratively and adjust the sand replenishment rate, forming a complete feedback control loop. Compared to the simple open-loop linkage mode of detection and sand replenishment in existing technologies, this system can dynamically adjust the sand replenishment amount according to the real-time changes in particle adhesion, effectively avoiding large fluctuations in particle adhesion and keeping the particle adhesion on the surface of the diamond wire stable within the preset target range. This ensures the cutting performance of the diamond wire saw and the consistency of product batches from the source, significantly reducing the defect rate in the production process.

[0024] The system automatically completes the entire process from real-time detection of particle adhesion, data processing and analysis, generation of adjustment commands, to execution of sand replenishment. It eliminates the need for operators to monitor and manually intervene in the sand replenishment rate throughout the process, completely freeing it from the reliance on manual experience inherent in traditional sand replenishment methods. This not only significantly reduces the workload of operators but also completely avoids the subjective errors and delays caused by manual operation, ensuring the continuous and stable operation of the production line and effectively improving the overall production efficiency of diamond wire saws.

[0025] Through a human-machine interface unit that communicates bidirectionally with the central control unit, operators can intuitively and conveniently input various control parameters and operating commands into the system, while simultaneously obtaining real-time system operating status information. Compared to existing systems that lack convenient parameter setting and status monitoring methods, this system can complete equipment parameter configuration, operating status monitoring, and preliminary fault diagnosis without complex professional operations, significantly reducing the operational threshold and maintenance difficulty of the equipment, and significantly shortening the equipment commissioning cycle and fault handling time.

[0026] This system breaks down its core functions into independent online detection units, central control units, human-machine interaction units, drive adjustment units, and sand replenishment execution units. Each unit has a clear division of labor and standardized interfaces. This modular architecture not only facilitates daily maintenance and component replacement but also allows for flexible adjustment or upgrading of the configuration of each functional unit according to the production needs of diamond wire saws of different specifications. It requires no large-scale modification of the overall system, possessing strong versatility and scalability, and can be directly adapted to the sand replenishment control needs of various diamond wire saw production lines. Attached Figure Description

[0027] Figure 1 This is a schematic diagram of the control system framework for automatic sand replenishment in a diamond wire saw production line according to the present invention. Detailed Implementation

[0028] To better understand the purpose, structure, and function of this invention, the following detailed description of an automatic sand replenishment control system for a diamond wire saw production line, in conjunction with the accompanying drawings, is provided.

[0029] Implementation example:

[0030] An automatic sand replenishment control system for a diamond wire saw production line is disclosed. This system is used in the sand replenishment process of mainstream electroplated diamond wire saw production lines in the industry. The overall system is a closed-loop control system integrating online detection, central control, human-machine interaction, drive adjustment, and sand replenishment execution. Figure 1 As shown, the core of the system consists of five main modules: an online detection unit, a central control unit, a human-machine interface unit, a drive adjustment unit, and a sand replenishment execution unit. These modules are connected via an industrial bus or mechanical transmission to collaboratively complete the real-time detection and automatic sand replenishment adjustment of the diamond particle adhesion amount. In this embodiment, the production line operates at a speed of 12 m / s, the produced diamond wire saw has a diameter of φ0.06 mm, and the preset target diamond particle adhesion amount is 50 particles / mm. All the following parameters are suitable for this production condition.

[0031] The online inspection unit is used to acquire surface images of the diamond wire in operation in real time and count the number of particles. It consists of two parts: an image acquisition component and an image processing component. The image acquisition component uses a coaxially mounted high-definition industrial camera and a 10x magnification microscope lens. The entire unit is installed directly above the production line, 30cm from the outlet of the upper sand tank. The optical axis of the microscope lens is perpendicular to the running plane of the diamond wire, and the working distance between the lens and the diamond wire is 50mm. The sampling frequency of the industrial camera is set to 120 frames / second, acquiring a 1mm long image of the diamond wire surface each time to ensure that each diamond particle can be clearly captured.

[0032] The image processing component includes an FPGA chip integrated into the industrial camera, with built-in optimized denoising and particle recognition algorithms. It can automatically filter noise interference caused by line jitter and ambient light reflection, perform binarization processing, edge extraction and particle counting on the acquired image, count the number of diamond particles on the diamond wire within a unit length, generate particle attachment information, and transmit the data to the central control unit in real time via Ethernet with a data transmission delay of less than 10ms.

[0033] The central control unit is the core of the system and adopts a programmable logic controller (PLC). Its input port is connected to the Ethernet interface of the online detection unit, and its output port is connected to the frequency converter of the drive regulation unit via RS485 industrial bus. At the same time, it achieves bidirectional communication with the human-machine interaction unit through the PROFINET bus.

[0034] After receiving the real-time particle adhesion information transmitted by the online detection unit, the PLC performs gradient averaging filtering. In this embodiment, the sampling period is set to 100ms and the averaging frequency is set to 10 times, that is, the arithmetic average of 10 sets of sampled data is performed every 1 second to obtain the filtered stable particle adhesion amount, eliminating the random error of a single detection. The filtered real-time particle adhesion amount is compared with the preset target particle adhesion amount (50 particles / mm), and gradient interval matching logic is used to generate sand replenishment adjustment instructions; at the same time, equipment start / stop instructions and fault reset instructions can be sent to the drive adjustment unit. The PLC has a built-in 128MB data storage module, which can continuously store 30 days of production data, including real-time particle adhesion curves, motor operating frequency records, control parameter modification logs, and fault alarm information. Data can be exported via USB flash drive for subsequent analysis.

[0035] The human-machine interface unit uses a 10-inch touchscreen display, installed on the control cabinet panel on the production line's operating side, and communicates bidirectionally with the central control unit. Operators can set the following core control parameters via the touchscreen: target particle adhesion amount (50 particles / mm in this embodiment), basic power parameters (basic motor frequency, initially set to 25Hz in this embodiment), particle adhesion amount gradient range, and the corresponding power adjustment value for each gradient range. It displays the real-time particle adhesion amount of the diamond wire (unit: particles / mm), the current operating frequency of the drive motor (unit: Hz), the working status of the sand replenishment execution unit (running / stopped / faulty), and the system operating mode (manual / automatic). An audible and visual alarm will pop up when the particle adhesion amount exceeds the preset threshold or when equipment malfunctions.

[0036] The drive adjustment unit, composed of a frequency converter and a variable frequency speed control motor, adjusts the output power according to the instructions of the central control unit. The frequency converter's input is connected to the PLC via an RS485 bus to receive frequency adjustment commands; its output is electrically connected to the variable frequency speed control motor, with an output frequency adjustment range of 0-50Hz. The frequency converter employs a closed-loop speed control mode, acquiring actual speed feedback signals through an encoder at the motor's tail and correcting the output frequency in real time. Speed ​​adjustment accuracy reaches ±0.1Hz, with a response time of less than 200ms. The variable frequency speed control motor has a rated speed of 1400 r / min. Its output shaft is coaxially connected to the screw conveyor shaft of the sand replenishment execution unit via a coupling. The motor speed and the sand replenishment rate of the sand replenishment execution unit have a strictly linear relationship; in this embodiment, for every 100 r / min increase in motor speed, the sand replenishment rate increases by 0.5 g / min.

[0037] The sand replenishment unit employs a horizontal spiral sand feeding device, integrally installed above the upper sand trough. The sand storage hopper has a volume of 5L and is equipped with an internal stirring mechanism to prevent diamond particles from clumping. One end of the spiral conveyor shaft is coaxially connected to the output shaft of a variable frequency speed control motor via a coupling, while the other end extends into the upper sand trough. When the spiral conveyor shaft rotates, it evenly transports the diamond particles in the sand storage hopper to the upper sand trough, achieving quantitative sand replenishment.

[0038] The core control logic of this system is gradient interval matching adjustment logic. The gradient interval and corresponding power adjustment value are preset through the human-machine interaction unit. In this embodiment, with the target particle adhesion amount of 50 particles / mm as the center, 10 continuous and non-overlapping particle adhesion amount gradient intervals are divided on both the upper and lower sides. Each interval corresponds to a preset motor frequency adjustment value. The specific correspondence is shown in Table 1.

[0039] 40-41 +5.0 50-51 -0.5 41-42 +4.5 51-52 -1.0 42-43 +4.0 52-53 -1.5 43-44 +3.5 53-54 -2.0 44-45 +3.0 54-55 -2.5 45-46 +2.5 55-56 -3.0 46-47 +2.0 56-57 -3.5 47-48 +1.5 57-58 -4.0 48-49 +1.0 58-59 -4.5 49-50 +0.5 59-60 -5.0

[0040] Table 1. Correspondence between particle adhesion gradient range and motor frequency adjustment value

[0041] After system startup, it defaults to manual mode. The operator sets the initial base motor frequency to 25Hz via the touchscreen and starts the sand replenishment device. At this time, the online detection unit begins real-time monitoring of particle adhesion, and the PLC performs gradient averaging filtering and feeds the data back to the touchscreen. The operator fine-tunes the base motor frequency based on the real-time particle count. When the particle adhesion remains stable within the range of 49-51 particles / mm for three consecutive minutes, the operator clicks the "Switch to Automatic Mode" button on the touchscreen, and the system enters automatic adjustment mode. After automatic operation, the PLC matches the filtered real-time particle adhesion every second with the aforementioned 20 gradient intervals to determine the corresponding motor frequency adjustment value. It then calculates the inverter's target output frequency according to the formula "Target Output Frequency = Base Motor Frequency ± Corresponding Frequency Adjustment Value" and sends this calculation to the inverter. The inverter adjusts the output frequency according to the command, thereby changing the motor speed and sand replenishment rate to ensure the particle adhesion remains stable within the target range of 49-51 particles / mm.

[0042] During operation, the production line starts the sanding process. The operator sets the target particle adhesion amount to 50 particles / mm, the base motor frequency to 25Hz, the sampling period to 100ms, and the averaging frequency to 10 times on the touchscreen, importing the gradient range and frequency adjustment parameters. The online detection unit and sand replenishment device are activated, and the system enters manual debugging mode. The industrial camera acquires images of the diamond wire surface at 120 frames / second, and the image processing component counts the particles and transmits the data to the PLC. After 5 minutes of manual debugging, the particle adhesion amount stabilizes at 49.5-50.5 particles / mm, and the operator switches the system to automatic mode. During operation, if the real-time particle adhesion amount after PLC filtering is 47.2 particles / mm, matching the "47-48 particles / mm" range, the corresponding frequency adjustment value is +1.5Hz. Therefore, the target output frequency = 25Hz + 1.5Hz = 26.5Hz. The PLC sends this instruction to the frequency converter, which adjusts the output frequency to 26.5Hz. The motor speed increases, the sand replenishment rate increases, and the particle adhesion amount gradually recovers. When the particle adhesion level rises to 50.3 particles / mm, it matches the "50-51 particles / mm" range, corresponding to a frequency adjustment value of -0.5Hz. The target output frequency = 25Hz - 0.5Hz = 24.5Hz, and the sand replenishment rate is reduced to avoid excessive particle adhesion. During production, the PLC stores all operating data in real time, and operators can view historical curves or export data at any time via the touch screen. If a fault occurs, such as motor overload or insufficient sand in the sand replenishment device, the system immediately stops sand replenishment and displays an alarm prompt.

[0043] The system of this invention collects particle information on the surface of diamond wire in real time through an online detection unit. Gradient averaging filtering eliminates random errors from single detections, ensuring the accuracy and real-time nature of the detection data. The core employs a gradient-range matching logic centered on the target particle adhesion amount, replacing the traditional single fixed-frequency adjustment method. This allows for precise adjustment of power output parameters based on subtle deviations in particle adhesion, combined with closed-loop speed control of the drive unit, achieving refined and gradient adjustment of the sand replenishment amount. This ensures the particle adhesion amount on the diamond wire surface remains stably within a preset target range, effectively solving the problem of large particle number fluctuations, significantly improving batch consistency, and reducing the production defect rate. It achieves unmanned closed-loop control from real-time particle adhesion detection, data processing and analysis, adjustment command generation to sand replenishment execution, completely replacing manual real-time monitoring and manual adjustment of the sand replenishment rate. This significantly reduces the labor intensity of operators and completely avoids subjective errors and adjustment lags caused by manual operation, ensuring the production line can operate continuously and stably for extended periods, effectively improving overall production efficiency. The human-machine interface allows for intuitive and convenient setting of various core control parameters, while simultaneously providing real-time monitoring of system operation status and alarm information. This significantly reduces the operational threshold and greatly improves the efficiency of equipment debugging and troubleshooting. The central control unit has a built-in data storage module that comprehensively records various data during the production process, including changes in particle adhesion, power parameter operation, parameter modifications, and faults. It supports historical data querying and export, providing reliable data support for process parameter optimization and production management improvement. Each functional unit has a clear division of labor and standardized interfaces, facilitating daily maintenance and component replacement. All core control parameters can be flexibly customized without modifying the hardware structure, adapting to diamond wire saw production lines with different wire diameters, particle densities, and production speeds. It can directly interface with existing mainstream electroplated diamond wire saw production equipment, demonstrating strong versatility and application value.

[0044] It is understood that the present invention has been described through some embodiments, and those skilled in the art will recognize that various changes or equivalent substitutions can be made to these features and embodiments without departing from the spirit and scope of the invention. Furthermore, under the teachings of the present invention, these features and embodiments can be modified to adapt to specific situations and materials without departing from the spirit and scope of the invention. Therefore, the present invention is not limited to the specific embodiments disclosed herein, and all embodiments falling within the scope of the claims of this application are within the protection scope of the present invention.

Claims

1. A control system for automatic sand replenishment in a diamond wire saw production line, characterized in that, It includes an online detection unit, a central control unit, a human-machine interaction unit, a drive adjustment unit, and a sand replenishment execution unit; The online detection unit is used to detect the amount of diamond particles adhering to the surface of the diamond wire in the diamond wire saw production line in real time, and transmits the detected particle adhesion information to the central control unit in real time. The human-machine interaction unit is bidirectionally connected to the central control unit, and is used to input control parameters and operation commands to the central control unit, and to receive and display system operation status information fed back by the central control unit. The central control unit is communicatively connected to the online detection unit and the drive adjustment unit, respectively. It is used to receive particle adhesion information transmitted by the online detection unit, perform data preprocessing on the information and compare it with the preset target particle adhesion amount, generate corresponding sand replenishment adjustment instructions based on the comparison results and send them to the drive adjustment unit. The output end of the drive adjustment unit is connected to the sand replenishment execution unit for adjusting the output power parameters according to the received sand replenishment adjustment command; The sand replenishment execution unit adjusts the sand replenishment rate according to the power output by the drive adjustment unit, thereby dynamically adjusting the amount of diamond particles attached to the diamond wire so that the amount of particles attached meets the preset target.

2. The automatic sand replenishment control system for a diamond wire saw production line according to claim 1, characterized in that, The online detection unit includes an image acquisition component and an image processing component. The image acquisition component is installed above the diamond wire saw production line to acquire image information of the diamond wire surface in real time. The image processing component identifies and analyzes the acquired images, counts the number of diamond particles on the diamond wire per unit length, and generates particle adhesion information.

3. The control system for automatic sand replenishment in a diamond wire saw production line according to claim 2, characterized in that, The image acquisition component includes an industrial camera and a microscope head. The high-definition industrial camera and the microscope head are coaxially assembled, and the optical axis of the microscope head is perpendicular to the plane in which the diamond wire runs.

4. The control system for automatic sand replenishment in a diamond wire saw production line according to claim 1, characterized in that, The central control unit includes a programmable logic controller (PLC), which is connected to the drive adjustment unit via an industrial bus and sends adjustment commands, start / stop commands, and fault reset commands to the drive adjustment unit.

5. The automatic sand replenishment control system for a diamond wire saw production line according to claim 1, characterized in that, The human-machine interaction unit includes a touch screen. The control parameters set through the touch screen include the target particle adhesion amount, basic power parameters, particle adhesion amount gradient range, and power adjustment values ​​corresponding to each gradient range. The system operation status information displayed through the touch screen includes real-time particle adhesion amount, current power parameters, working status of the sand replenishment execution unit, and system operation mode.

6. The control system for automatic sand replenishment in a diamond wire saw production line according to claim 1, characterized in that, The drive adjustment unit includes a frequency converter and a variable frequency speed control motor; the input end of the frequency converter is communicatively connected to the central control unit, and the output end is electrically connected to the variable frequency speed control motor, adjusting the output frequency according to the adjustment command of the central control unit; the output shaft of the variable frequency speed control motor is drively connected to the sand replenishment execution unit, and its rotational speed corresponds to the sand replenishment rate of the sand replenishment execution unit; the frequency converter adopts a speed closed-loop control mode, correcting the output frequency by collecting the actual speed feedback signal of the variable frequency speed control motor.

7. The control system for automatic sand replenishment in a diamond wire saw production line according to claim 1, characterized in that, The sand replenishment execution unit is a spiral sand feeding device, and the spiral conveying shaft of the spiral sand feeding device is coaxially connected to the output end of the drive adjustment unit.

8. The control system for automatic sand replenishment in a diamond wire saw production line according to claim 1, characterized in that, The central control unit performs gradient averaging filtering on the particle adhesion information, using a multi-period continuous sampling averaging method. The sampling period and the number of averages are set by the human-machine interaction unit.

9. The control system for automatic sand replenishment in a diamond wire saw production line according to claim 8, characterized in that, The central control unit generates sand replenishment adjustment commands using gradient interval matching logic. Centered on the target particle adhesion amount, multiple continuous and non-overlapping particle adhesion amount gradient intervals are divided on both sides above and below it. Each gradient interval corresponds to a preset power adjustment value. The central control unit matches the pre-processed real-time particle adhesion amount with the gradient intervals to determine the corresponding power adjustment value. The target power parameters are calculated by matching the basic power parameters with the corresponding power adjustment value, and the sand replenishment adjustment command is generated.

10. The control system for automatic sand replenishment in a diamond wire saw production line according to claim 1, characterized in that, The central control unit has a built-in data storage module for storing real-time particle adhesion curves, power parameter operation records, control parameter modification logs, and fault alarm information during the production process, and supports historical data query and export.

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