Lining cutting control system and signal monitoring method

Abstract

The invention discloses a lining cutting control system and a signal monitoring method. The control system comprises an industrial computer, an electromagnetic valve, an air cylinder, a blade, a pressure sensor, an industrial camera, a signal processing unit and a multifunctional module. Information of a sheet section needing to be cut at a cutting position is obtained through an industrial computer, and a signal is output to control an electromagnetic valve, so that an output shaft of an air cylinder drives a blade to cut a lining; according to the method, the cutting signal prediction model is obtained after mathematical segmentation description is carried out on the cutting signal, then the numerical values of the voltage measurement signals in a time period of the cutting process are compared, the cutting process can be accurately monitored, and accurate information about whether abnormity occurs or not is obtained; a pressure signal for cutting the lining is converted into a voltage signal through the pressure sensor and the signal processing unit, the industrial computer samples and converts the voltage signal and compares the value with a predicted voltage calculation value of the cutting signal prediction model, and the abnormity occurring in the lining cutting process can be early warned in real time.

Description

Technical Field

[0001] This invention belongs to the field of automotive non-metallic parts processing technology, and relates to a brake pad cutting control system and signal monitoring method. Background Technology

[0002] Brake sheet cutting control systems are used in fields such as automotive non-metallic parts processing. When it is necessary to cut long brake sheets into multiple segments, the long brake sheets are usually manually ground with a grinding wheel at the processing unit to obtain shorter brake sheets. However, the grinding process generates a large amount of debris that floats into the air. This seriously pollutes the air in the surrounding production environment and threatens the health of nearby personnel. When using a laser to cut long brake sheets to obtain shorter brake sheets, the cutting process generates a large amount of smoke and dust that floats into the air, which also pollutes the air in the surrounding production environment and threatens the health of nearby personnel. Moreover, the processing cost of laser cutting brake sheets is high. In addition, by monitoring and predicting changes in the grinding signal during the grinding process, abnormal conditions occurring during brake sheet cutting can be reflected in real time and warnings can be issued. However, traditional monitoring and prediction processes usually rely on careful observation and rough judgment based on years of experience by the grinding operators. They cannot accurately monitor the grinding process and obtain accurate information on abnormal conditions, nor can they achieve the purpose of early warning through effective prediction. Summary of the Invention

[0003] To overcome the shortcomings of existing methods, this invention provides a brake sheet cutting control system and signal monitoring method. This invention uses an industrial computer to process side-view images of the brake sheet captured by an industrial camera to obtain information about the position of the sheet segment to be cut. The computer outputs a signal to control a solenoid valve, causing the cylinder's output shaft to drive the blade to cut the brake sheet. This allows for automatic and environmentally friendly brake sheet cutting, reducing cutting costs and significantly decreasing air pollution caused by traditional cutting processes. By mathematically segmenting the cutting signal to obtain a cutting signal prediction model, and comparing the voltage measurement signal values ​​within a certain time period of the cutting process, accurate monitoring of the cutting process and accurate information on whether any abnormalities have occurred can be obtained. A pressure sensor and signal processing unit convert the pressure signal of the brake sheet into a voltage signal. The industrial computer samples and converts this signal, then compares it with the predicted voltage value calculated by the cutting signal prediction model. This provides real-time warnings of abnormalities occurring during brake sheet cutting, offering operators accurate information to promptly eliminate potential anomalies.

[0004] The technical solution of the present invention is as follows:

[0005] This invention provides a brake sheet cutting control system, which includes an industrial computer, a solenoid valve, a cylinder, a blade, a pressure sensor, an industrial camera, a signal processing unit, and a multi-functional module.

[0006] The industrial camera is connected to the industrial computer via a cable. The industrial camera is used to capture a side view image of the brake sheet placed on the cutting platform. After the image is processed by the industrial computer, the information of the cut section of the sheet to be cut is obtained. Based on the position information, the industrial computer outputs a signal through the multi-functional module to control the solenoid valve, so that the output shaft of the cylinder drives the blade to cut the brake sheet, thus automatically and environmentally completing the action of cutting the brake sheet.

[0007] The pressure sensor converts the pressure signal from cutting the brake pads into a current signal; the signal processing unit converts this current signal into a voltage signal and sends it to the multi-function module. At the same time, the multi-function module sends an AD conversion start signal to the industrial computer. The industrial computer samples the input converted voltage signal through the multi-function module and converts it into a corresponding voltage measurement value. Finally, it compares the voltage measurement signal value with the voltage calculation value of the cutting signal prediction model within a certain time period of the cutting process to determine whether to output a signal through the multi-function module to warn of any abnormalities that occur during the brake pad cutting process.

[0008] In this invention, the output signal of the multi-functional module controls the electro-acoustic element to sound and emit a warning sound signal.

[0009] The present invention also provides a method for monitoring the cutting signal of a brake sheet based on the above-mentioned brake sheet cutting control system, comprising the following steps:

[0010] 1) Based on the characteristics of the cutting signal when the blade is driven vertically to cut the restoring plate with good cut surface integrity, during the vertical descent of the blade and the cutting process from contacting the upper surface of the restoring plate to penetrating the lower surface, the conversion voltage signal sent by the industrial computer to the multi-function module is sampled and converted into the corresponding voltage measurement signal and divided into four linear segments: the first linear segment is the rapid rise segment of the cutting signal, the second linear segment is the rapid fall segment of the cutting signal, the third linear segment is the stable segment of the cutting signal, and the fourth linear segment is the slow fall segment of the cutting signal.

[0011] 2) Determine the voltage amplitude threshold and time period for the four linear segments;

[0012] 3) Use step functions to describe the voltage signals of the four linear segments mentioned above;

[0013] 4) At measurement time t and after a short period of time t followed by t+ At time t, when t and t+ When t belongs to the same linear segment, the industrial computer samples the converted voltage signal through a multi-functional module and converts it into the corresponding digital voltage measurement signal V. c (t) and V c (t+ The system calculates the current measurement time (t) and determines the linear segment to which the current measurement time belongs. Then, the industrial computer compares the values ​​of the two and decides whether to output a control warning sound signal.

[0014] 5) At measurement time t and At time t, the industrial computer determines the linear segment to which the current measurement time belongs, and from the segmented signal prediction model, it determines the voltage signal calculation formula for the corresponding segment, and calculates the predicted voltage signal V. y (t+ The value of t) is then compared by an industrial computer with the digital voltage measurement signal V. c (t+ t) and the predicted voltage signal V y (t+ The value of t) determines whether to output a control warning sound signal.

[0015] As a further aspect of the present invention: in step (2), the starting time of the first linear segment is 0, the maximum value of its rising segment is the voltage amplitude threshold y0 of the first linear segment, and the time corresponding to this threshold is the ending time t0 of the first linear segment; the starting time of the second linear segment is t0. 0+ The minimum voltage value of the falling segment is the voltage amplitude threshold y1 of the second linear segment, and the time corresponding to this threshold is the termination time t1 of the second linear segment; the start time of the third linear segment is t1. 1+ The third linear segment terminates at time t2, and its stable voltage amplitude threshold is y2; the fourth linear segment begins at time t. 2+ The minimum value of its falling segment is the voltage amplitude threshold y3 of the fourth linear segment, and the time corresponding to this threshold is the termination time t3 of the fourth linear segment; in step (3), the following method is used to construct the cutting signal prediction model.

[0016] when At that time, the voltage signal V1(t) of the first linear segment can be described by the step function u(t) as follows:

[0017]

[0018] when At that time, the voltage signal V2(t) of the second linear segment can be described by the step function u(t) as follows:

[0019]

[0020] when At that time, the voltage signal V3(t) of the third linear segment can be described by the step function u(t) as follows:

[0021]

[0022] when At that time, the voltage signal V4(t) of the fourth linear segment can be described by the step function u(t):

[0023]

[0024] As a further aspect of the present invention: in step (2), the value range of y0 is 300~1500mV, the value range of t0 is 100~200ms; the value range of y1 is 100~300mV, the value range of t1 is 140~270ms; the value range of y2 is 100~300mV, the value range of t2 is 1500~1800ms; the value range of y3 is 50~250mV, the value range of t3 is 1600~1900ms; The value of time t ranges from 2 to 10 ms; t0 < t1 < t2 < t3; y3 < y2 y1 < y0.

[0025] As a further aspect of the present invention: in step (4), at measurement time t and At time t, the industrial computer samples the converted voltage signal output by the signal processing unit and converts it into the corresponding digital voltage measurement signal V. c (t) and V c (t+ t), and determine the linear segment to which the current measurement time belongs, then the industrial computer compares V c (t) and V c (t+ The value of t):

[0026] when At that time, V c (t)-V c (t+ When t)> 0, the industrial computer controls the electro-acoustic element to sound, outputting a warning sound signal;

[0027] when At that time, V c (t)-V c (t+ When t) < 0, the industrial computer controls the electro-acoustic element to sound, outputting a warning sound signal;

[0028] when hour, K1 is an industrial computer-controlled electro-acoustic element that sounds an alarm, outputting a warning sound signal; the value of K1 ranges from 8% to 30%.

[0029] when At that time, V c (t)-V c(t+ When t) < 0, the industrial computer controls the electro-acoustic element to sound, outputting a warning sound signal;

[0030] As a further aspect of the present invention: in step (5), at measurement time t and At time t, the industrial computer determines the linear segment to which the current measurement time belongs, determines the voltage signal calculation formula for the corresponding segment from the segment prediction model, and then calculates the voltage signal after... The predicted voltage signal V of the time-cut signal prediction model y (t+ t), then compare this signal with the digital voltage measurement signal V. c (t+ The value of t):

[0031] when hour, K2 is an industrial computer-controlled electro-acoustic element that sounds and outputs a warning sound signal; the value of K2 ranges from 8% to 20%.

[0032] Compared with the prior art, the present invention has the following technical effects:

[0033] 1. The industrial computer obtains the information of the cutting position of the sheet segment to be cut by processing the side view image of the brake sheet taken by the industrial camera. The output signal controls the solenoid valve, so that the output shaft of the cylinder drives the blade to cut the brake sheet. The cutting of the brake sheet can be completed automatically and environmentally, reducing cutting costs and significantly reducing air pollution caused by traditional cutting processes.

[0034] 2. By mathematically segmenting the cutting signal to describe the cutting process, a cutting signal prediction model is obtained. Then, by comparing the voltage measurement signal values ​​within a certain time period of the cutting process, the cutting process can be accurately monitored and accurate information on whether any abnormalities have occurred can be obtained.

[0035] 3. The pressure signal of the cutting brake pad is converted into a voltage signal by a pressure sensor and a signal processing unit. The industrial computer samples and converts the signal, and compares the value with the predicted voltage calculated by the cutting signal prediction model. This can provide real-time warnings of abnormalities that occur during the cutting process of the brake pad, providing operators with accurate information to eliminate potential abnormal factors in a timely manner. Attached Figure Description

[0036] Figure 1 This is a schematic diagram of the brake pad cutting control system of the present invention.

[0037] Figure 2 This is a flowchart of the method for monitoring the cutting signal of the brake pads according to the present invention.

[0038] Figure 3This is a diagram showing the measured results of cutting a brake pad according to an embodiment of the present invention.

[0039] Figure 4 This is a predicted cutting signal diagram constructed when cutting a feed sheet according to an embodiment of the present invention. Detailed Implementation

[0040] The present invention will be further described in detail below with reference to the accompanying drawings and embodiments, but these embodiments are not intended to limit the present invention.

[0041] Example 1

[0042] like Figure 1 As shown, this invention provides a brake pad cutting control system, including an industrial computer 1, a solenoid valve 2, a cylinder 3, a blade 4, a pressure sensor 5, an industrial camera 6, a signal processing unit 7, and a multi-functional module 8. The industrial camera 6 is connected to the industrial computer 1 via a cable. When a brake pad with a length of 420mm, a width of 39mm, a thickness of 4.8mm, and a hardness of 43.5HD is used, and a sheet of material with a length of 136.5mm is to be obtained, the brake pad is segmented and cut using the blade 4. After the control system is powered on, the industrial camera 6 captures a side view image of the brake pad placed on the cutting platform and transmits the captured image to the industrial computer 1. The industrial computer 1 performs image binarization and filtering to obtain the pixel area occupied by the side view image of the brake pad and its position on the cutting platform. Then, using the ratio of the length of the scale at the actual position where the brake pad is placed to the pixels occupied by the scale in the image, information about the cutting surface of the 136.5mm long sheet segment and the cutting position of the relief groove on the cutting platform is obtained. When the cutting surface coincides with the cutting position of the retraction groove, the industrial computer 1 controls the solenoid valve 2 via the multi-function module 8 to open the compressed air intake channel, allowing 0.6 MPa compressed air to enter the cylinder 3. This pushes the output shaft of the cylinder 3, causing the blade 4 to descend vertically along the retraction groove cutting position, cutting the brake sheet. The cutting action is completed within 2 seconds, resulting in a sheet segment with a length of 136.5 mm. After this action, a small amount of debris, no more than 0.3 g, falls from the brake sheet cutting point and into the retraction groove. Then, the industrial computer 1 controls the solenoid valve 2 via the multi-function module 8 to close the compressed air intake channel and release the compressed air in the cylinder 3. This causes the output shaft of the cylinder 3 to drive the blade 4 vertically upward, leaving the cutting platform and stopping at the set position above the brake sheet, awaiting the next cutting task. Because this cutting process directly uses the blade, the cost is low, and no debris or dust floats into the air. The debris that falls into the retraction groove can be easily collected and disposed of through simple cleaning. This demonstrates that this brake pad cutting control method can automatically and environmentally complete the brake pad cutting action, reducing cutting costs and significantly reducing air pollution caused by traditional cutting processes.

[0043] During the above process, when the blade 4 descends vertically to the cutting position of the retraction groove and cuts the brake pad, a cutting force is applied to the brake pad. At this time, the pressure sensor 5 installed under the cutting platform converts the pressure signal of cutting the brake pad into a 0~20mA current signal and sends this current signal to the signal processing unit 7 via a cable. Then, the signal processing unit 7 converts the current signal into a 0~5V voltage signal and sends it to the multi-function module 8. Simultaneously, the multi-function module 8 sends an AD conversion start signal to the industrial computer 1. The industrial computer 1 samples the input 0~5V converted voltage signal through the multi-function module 8 and converts it into the corresponding digital voltage measurement value V. c (t), and finally, the industrial computer 1 compares the value with the voltage calculation value of the cutting signal prediction model to decide whether to control the electro-acoustic element to sound and issue a warning sound signal through the output signal of the multi-functional module 8.

[0044] Example 2

[0045] like Figure 2 As shown, a method for monitoring the cutting signal of a feeder sheet includes the following steps:

[0046] 1) Based on the characteristics of the cutting signal when the blade 4 is driven vertically to cut the restoring plate by pneumatic means and the cutting surface is relatively intact, during the process of the blade 4 descending vertically at the cutting position of the retraction groove and cutting from contacting the upper surface of the restoring plate to penetrating the lower surface, the conversion voltage signal sent by the industrial computer 1 to the multi-function module 8 is sampled and converted into a corresponding voltage measurement signal and divided into four linear segments.

[0047] 2) Determine the voltage amplitude threshold and time period for the four linear segments;

[0048] 3) Use step functions to describe the voltage signals of the four linear segments mentioned above;

[0049] 4) At the measurement time t and the time t+∆t corresponding to a short time interval ∆t, when t and t+∆t belong to the same linear segment, the industrial computer 1 samples the converted voltage signal through the multi-function module 8 and converts it into the corresponding digital voltage measurement signal V. c (t) and V c (t+ The system calculates the current measurement time (t) and determines the linear segment to which the current measurement time belongs. Then, the industrial computer 1 compares the values ​​of the two and decides whether to output a control warning sound signal.

[0050] 5) At measurement time t and At time t, the industrial computer 1 determines the linear segment to which the current measurement time belongs, determines the voltage signal calculation formula for the corresponding segment from the segmented signal prediction model, and calculates the predicted voltage signal V. y (t+ The value of t) is then compared by industrial computer 1 with the digital voltage measurement signal V. c (t+ t) and the predicted voltage signal V y (t+ The value of t) determines whether to output a control warning sound signal.

[0051] In this embodiment of the invention, in step (1), the first linear segment is the segment of rapid rise of the cutting signal, the second linear segment is the segment of rapid fall of the cutting signal, the third linear segment is the segment of stable cutting signal, and the fourth linear segment is the segment of slow fall of the cutting signal.

[0052] In this embodiment of the invention, in step (2), the start time of the first linear segment is 0, the maximum value of its rising segment is the voltage amplitude threshold y0 of the first linear segment, the value of y0 is 800mV, and the time corresponding to this threshold is the end time t0 of the first linear segment, the value of t0 is 150ms; the start time of the second linear segment is t 0+ The minimum voltage value of the falling segment is the voltage amplitude threshold y1 of the second linear segment, where y1 is 260mV. The time corresponding to this threshold is the termination time t1 of the second linear segment, which is 170ms. The start time of the third linear segment is t1. 1+ The voltage amplitude threshold of its stable segment is y2, which is 260mV; the termination time of the third linear segment is t2, which is 1640ms; the start time of the fourth linear segment is t... 2+ The minimum value of its falling segment is the voltage amplitude threshold y3 of the fourth linear segment. The value of y3 is 200mV. The time corresponding to this threshold is the termination time t3 of the fourth linear segment. The value of t3 is 1670ms. The time t is 5ms, where t0 < t1 < t2 < t3; y3 < y2 y1 < y0.

[0053] In this embodiment of the invention, in step (3), the cutting signal prediction model is constructed as follows:

[0054] when At that time, the voltage signal V1(t) of the first linear segment can be described by the step function u(t) as follows:

[0055] (1)

[0056] when At that time, the voltage signal V2(t) of the second linear segment can be described by the step function u(t) as follows:

[0057] (2)

[0058] when At that time, the voltage signal V3(t) of the third linear segment can be described by the step function u(t) as follows:

[0059] (3)

[0060] when At that time, the voltage signal V4(t) of the fourth linear segment can be described by the step function u(t):

[0061] (4)

[0062] In this embodiment of the invention, in steps (4) and (5), K1 is 10% and K2 is 10%, and different measurement times t are taken. The following measurements and calculations were performed after t=5ms:

[0063] When the measurement time t is 50ms, the industrial computer 1 samples the converted voltage signal through the multi-function module 8 and converts it into the corresponding digital voltage measurement value V. c (50) = 270mV, then the industrial computer 1 calculates the measurement time t = 50ms and t + At t=55ms, the linear segment to which it belongs is determined to be the first linear segment, and the digital voltage measurement value V obtained by industrial computer 1 is... c (50+5)=290mV. Because... , and V c (50)-V c (50+5) < 0, so the industrial computer 1 will control the electro-acoustic element to remain silent and not output a warning sound signal via the multi-function module 8. Therefore, by sampling and converting the digital voltage measurement values ​​at different times within the first linear segment, the industrial computer 1 can accurately monitor the first linear segment of the cutting process and obtain accurate information on whether an abnormality has occurred. Assuming in this embodiment, when the measurement times t = 50ms and t + 0ms... At t=55ms, the linear segment to which it belongs is determined to be the first linear segment, and the digital voltage measurement value V obtained by industrial computer 1 is... c (50+5)=330mV. Using the established cutting signal prediction model, the corresponding calculation formula is determined as equation (1), yielding the voltage calculation value V of the cutting signal prediction model. y (50+5) is 293.2mV, V c (50+5) and V yThe absolute value of the relative error (50+5) is approximately 12.6%, which is greater than the set 10%. Therefore, the industrial computer 1 will control the electro-acoustic element to sound through the multi-functional module 8, outputting a warning sound signal. Thus, in the first linear segment, the industrial computer 1, through the multi-functional module 8, samples and converts the value, comparing it with the voltage calculation value of the cutting signal prediction model. This allows for real-time warnings of abnormalities occurring during the cutting process, providing accurate information for operators to promptly eliminate potential abnormal factors.

[0064] When the measurement time t is 155ms, the industrial computer 1 samples the converted voltage signal through the multi-function module 8 and converts it into the corresponding digital voltage measurement value V. c (155) = 405mV, then the industrial computer 1 uses the measurement time t = 155ms and t + At t=160ms, the linear segment to which it belongs is determined to be the second linear segment, and the digital voltage measurement value V obtained by industrial computer 1 is... c (155+5)=270mV. Because... , and V c (155)-V c If (155+5)>0, the industrial computer 1 will control the electro-acoustic element to remain silent and not output a warning sound signal via the multi-function module 8. Therefore, by sampling and converting the digital voltage measurement values ​​at different times within the second linear segment through the multi-function module 8, the industrial computer 1 can accurately monitor the second linear segment of the cutting process and obtain accurate information on whether an abnormality has occurred. Assuming in this embodiment, when the measurement times t=155ms and t+... At t=160ms, the linear segment to which it belongs is determined to be the second linear segment, and the digital voltage measurement value V obtained by industrial computer 1 is... c (155+5)=300mV. Using the established cutting signal prediction model, the corresponding calculation formula is determined as equation (2), yielding the voltage calculation value V of the cutting signal prediction model. y (155+5) is 270mV, V c (155+5) and V y The absolute value of the relative error (155+5) is approximately 11.1%, which is greater than the set 10%. Therefore, the industrial computer 1 will control the electro-acoustic element to sound through the multi-function module 8, outputting a warning sound signal. Thus, in the second linear segment, the industrial computer 1, through the multi-function module 8, samples and converts the value, comparing it with the voltage calculation value of the cutting signal prediction model. This allows for real-time warnings of abnormalities occurring during the cutting process, providing accurate information for operators to promptly eliminate potential abnormal factors.

[0065] When the measurement time t is 1200ms, the industrial computer 1 samples the converted voltage signal through the multi-function module 8 and converts it into the corresponding digital voltage measurement value V. c (1200) = 260mV, then the industrial computer 1 uses the measurement time t = 1200ms and t + At t=1205ms, it is determined that the linear segment it belongs to is the third linear segment, and the digital voltage measurement value V obtained by industrial computer 1 is... c (1200+5)=250mV. Because... , and V c (1200) and V c The absolute value of the relative error of (1200+5) is approximately 3.85%, which is less than the set value of 10%. Therefore, the industrial computer 1 will control the electro-acoustic element to remain silent and not output a warning sound signal via the multi-function module 8. Thus, by sampling and converting the digital voltage measurement values ​​at different times within the third linear segment through the multi-function module 8, the industrial computer 1 can accurately monitor the third linear segment of the cutting process and obtain accurate information on whether an abnormality has occurred. Assuming in this embodiment, when the measurement times t=1200ms and t+... At t=1205ms, it is determined that the linear segment it belongs to is the third linear segment, and the digital voltage measurement value V obtained by industrial computer 1 is... c (1200+5)=290mV. Using the established cutting signal prediction model, the corresponding calculation formula is determined as equation (3), yielding the voltage calculation value V of the cutting signal prediction model. y (1200+5) is 260mV, V c (1200+5) and V y The absolute value of the relative error (1200+5) is approximately 11.5%, which is greater than the set value of 10%. Therefore, the industrial computer 1 will control the electro-acoustic element to sound through the multi-functional module 8, outputting a warning sound signal. Thus, in the third linear segment, the industrial computer 1, through the multi-functional module 8, samples and converts the value, comparing it with the voltage calculation value of the cutting signal prediction model. This allows for real-time warnings of abnormalities occurring during the cutting process, providing accurate information for operators to promptly eliminate potential abnormal factors.

[0066] When the measurement time t is 1650ms, the industrial computer 1 samples the converted voltage signal through the multi-function module 8 and converts it into the corresponding digital voltage measurement value V. c (1650) = 240mV, then the industrial computer 1 uses the measurement time t = 1650ms and t+ At t=1655ms, its linear segment is determined to be the fourth linear segment, and the digital voltage measurement value V obtained by industrial computer 1 is... c (1650+5)=230mV. Because... , and V c (1650)-V c If (1650+5)>0, the industrial computer 1 will control the electro-acoustic element to remain silent and not output a warning sound signal via the multi-function module 8. Therefore, by sampling and converting the digital voltage measurement values ​​at different times within the fourth linear segment through the multi-function module 8, the industrial computer 1 can accurately monitor the fourth linear segment of the cutting process and obtain accurate information on whether an abnormality has occurred. Assuming in this embodiment, when the measurement times t=1650ms and t+... At t=1655ms, its linear segment is determined to be the fourth linear segment, and the digital voltage measurement value V obtained by industrial computer 1 is... c (1650+5)=265mV. Using the established cutting signal prediction model, the corresponding calculation formula is determined as equation (4), yielding the voltage calculation value V of the cutting signal prediction model. y (1650+5) is 230mV, V c (1650+5) and V y The absolute value of the relative error (1650+5) is approximately 15.2%, which is greater than the set value of 10%. Therefore, the industrial computer 1 will control the electro-acoustic element to sound through the multi-functional module 8, outputting a warning sound signal. Thus, in the fourth linear segment, the industrial computer 1, through the multi-functional module 8, samples and converts the value, comparing it with the voltage calculation value of the cutting signal prediction model. This allows for real-time warnings of abnormalities occurring during the cutting process, providing accurate information for operators to promptly eliminate potential abnormal factors.

[0067] As can be seen from the above, by mathematically segmenting the cutting signal to obtain a cutting signal prediction model for the cutting process, and then comparing the voltage measurement signal values ​​within a certain time period of the cutting process, the cutting process can be accurately monitored and accurate information on whether any abnormalities have occurred can be obtained. The pressure signal of the cutting brake pad is converted into a voltage signal by the pressure sensor 5 and the signal processing unit 7. The industrial computer 1 samples and converts the voltage signal through the multi-functional module 8, and then compares the value with the predicted voltage calculation value of the cutting signal prediction model. This can provide real-time warnings of abnormalities occurring during the cutting process of the brake pad, providing accurate information for operators to eliminate potential abnormal factors in a timely manner.

[0068] Figure 3 This is a diagram showing the actual measurement results of cutting a brake pad according to an embodiment of the present invention. As can be seen from the diagram, during the process of the blade 4 descending vertically at the cutting position of the retraction groove and cutting from contacting the upper surface of the brake pad to penetrating the lower surface, the industrial computer 1 samples the conversion voltage signal sent by the multi-functional module 8 and converts it into a corresponding voltage measurement signal, which can be divided into four linear segments.

[0069] Figure 4This is a predicted cutting signal diagram constructed during the cutting of a feed sheet according to an embodiment of the present invention. As can be seen from the diagram, the predicted voltage signal is basically consistent with the variation characteristics of the digital voltage measurement signal in the actual measurement results, indicating that it is feasible to construct a cutting signal prediction model.

[0070] In the above embodiments 1 and 2, the industrial computer 1 is model SK-15.6BDBAT, the solenoid valve 2 is model STNCTG2531-10, the cylinder 3 is model ADNGF-32-30, the blade 4 is a double-edged blade with a thickness of 1.6mm, a length of 60mm, and a hardness of 53.1HRC, the pressure sensor 5 is model BSQ-2, the industrial camera 6 is model JHSM120B, the signal processing unit 7 is model Jinli BSQ-2 transmitter, the multi-function module 8 is model Advantech multi-function module USB-4702, and the electro-acoustic element is model TMB12A05 buzzer.

[0071] According to the drive control results of this embodiment, the brake sheet cutting control system and signal monitoring method adopted in this invention obtains the information of the brake sheet segment to be cut at the cutting position by the industrial computer 1 based on the side view image of the brake sheet captured by the industrial camera 6, and outputs a signal to control the solenoid valve 2, so that the output shaft of the cylinder 3 drives the blade 4 to cut the brake sheet. The brake sheet cutting action can be completed automatically and environmentally, reducing cutting costs and significantly reducing air pollution caused by traditional cutting processes. After mathematical segmentation of the cutting signal, a cutting signal prediction model of the cutting process is obtained. Then, the voltage measurement signal value within a time period of the cutting process is compared, which can accurately monitor the cutting process and obtain accurate information on whether an abnormality has occurred. The pressure sensor 5 and the signal processing unit 7 convert the pressure signal of the brake sheet cutting into a voltage signal. The industrial computer 1 samples and converts the signal, and compares the value with the predicted voltage calculation value of the cutting signal prediction model. This can provide real-time warning of abnormalities occurring during the brake sheet cutting process, providing accurate information for operators to eliminate potential abnormal factors in a timely manner.

[0072] The embodiments described above are only used to illustrate the technical ideas and features of the present invention. Their purpose is to enable those skilled in the art to understand the content of the present invention and implement it accordingly. The patent scope of the present invention should not be limited by these embodiments alone. That is, all equivalent changes or modifications made in accordance with the spirit disclosed in the present invention still fall within the patent scope of the present invention.

Claims

1. A brake pad cutting control system, characterized in that: The control system includes an industrial computer (1), a solenoid valve (2), a cylinder (3), a blade (4), a pressure sensor (5), an industrial camera (6), a signal processing unit (7), and a multi-functional module (8); The industrial camera (6) is connected to the industrial computer (1) via a cable. The industrial camera (6) is used to capture a side view image of the brake sheet placed on the cutting platform. After the image is processed by the industrial computer (1), information about the position of the sheet to be cut is obtained. Based on this position information, the industrial computer (1) outputs a signal through the multi-function module (8) to control the solenoid valve (2), so that the output shaft of the cylinder (3) drives the blade (4) to cut the brake sheet vertically, thus completing the action of cutting the brake sheet automatically and in an environmentally friendly manner. The pressure sensor (5) converts the pressure signal of the cutting brake pad into a current signal; the signal processing unit (7) converts the current signal into a voltage signal and sends it to the multi-function module (8). At the same time, the multi-function module (8) sends an AD conversion start signal to the industrial computer (1). The industrial computer (1) samples the input converted voltage signal through the multi-function module (8) and converts it into the corresponding voltage measurement value. Finally, the industrial computer (1) compares the voltage measurement signal value and the predicted voltage calculation value of the cutting signal prediction model within a certain time period of the cutting process, and decides whether to output a signal through the multi-function module (8) to warn of any abnormalities that occur during the cutting of the brake pad.

2. A method for monitoring the cutting signal of a brake sheet in the brake sheet cutting control system of claim 1, characterized in that: Includes the following steps: 1) Based on the characteristics of the cutting signal when the blade (4) is driven vertically by the pneumatic method to cut the liner to obtain a better cut surface integrity, during the cutting process of the blade (4) descending vertically and from contacting the upper surface of the liner to penetrating the lower surface, the conversion voltage signal sent by the industrial computer (1) to the multi-functional module (8) is sampled and converted into the corresponding voltage measurement signal and divided into four linear segments: the first linear segment is the cutting signal rapid rise segment, the second linear segment is the cutting signal rapid fall segment, the third linear segment is the cutting signal stable segment, and the fourth linear segment is the cutting signal slow fall segment. 2) Determine the voltage amplitude threshold and time period for the four linear segments; 3) The voltage signals of the four linear segments are described by the step function to obtain the cutting signal prediction model of the cutting process; 4) At measurement time t and after a short period of time t followed by t+ At time t, when t and t+ When t belongs to the same linear segment, the industrial computer (1) samples the converted voltage signal through the multi-function module (8) and converts it into the corresponding digital voltage measurement signal V. c (t) and V c (t+ t), and determine the linear segment to which the current measurement time belongs, and then the industrial computer (1) compares the values ​​of the two and decides whether to output a control warning sound signal; 5) At measurement time t and At time t, the industrial computer (1) determines the linear segment to which the current measurement time belongs, determines the voltage signal calculation formula for the corresponding segment from the cutting signal prediction model, and calculates the predicted voltage signal V. y (t+ The value of t) is then compared by the industrial computer (1) with the digital voltage measurement signal V. c (t+ t) and the predicted voltage signal V y (t+ The value of t) determines whether to output a control warning sound signal.

3. The method for monitoring the cutting signal of the feeder blade according to claim 2, characterized in that: In step (2), the start time of the first linear segment is 0, the maximum value of its rising segment is the voltage amplitude threshold y0 of the first linear segment, and the time corresponding to this threshold is the end time t0 of the first linear segment; the start time of the second linear segment is t0. 0+ The minimum voltage value of the falling segment is the voltage amplitude threshold y1 of the second linear segment, and the time corresponding to this threshold is the termination time t1 of the second linear segment; the start time of the third linear segment is t1. 1+ The third linear segment terminates at time t2, and its stable voltage amplitude threshold is y2; the fourth linear segment begins at time t. 2+ The minimum value of its falling segment is the voltage amplitude threshold y3 of the fourth linear segment, and the time corresponding to this threshold is the termination time t3 of the fourth linear segment. In step (3), when At that time, the voltage signal V1(t) of the first linear segment can be described by the step function u(t) as follows: ； when At that time, the voltage signal V2(t) of the second linear segment can be described by the step function u(t) as follows: ； when At that time, the voltage signal V3(t) of the third linear segment can be described by the step function u(t) as follows: ； when At that time, the voltage signal V4(t) of the fourth linear segment can be described by the step function u(t): 。 4. The method for monitoring the cutting signal of the feeder blade according to claim 3, characterized in that: In step (2), the value range of y0 is 300~1500mV, the value range of t0 is 100~200ms; the value range of y1 is 100~300mV, the value range of t1 is 140~270ms; the value range of y2 is 100~300mV, the value range of t2 is 1500~1800ms; the value range of y3 is 50~250mV, the value range of t3 is 1600~1900ms. The value of time t ranges from 2 to 10 ms; t0 < t1 < t2 <t3;y3< y2 y1 < y0.

5. The method for monitoring the cutting signal of the feeder blade according to claim 2, characterized in that: In step (4), at measurement time t and At time t, the industrial computer (1) samples the converted voltage signal output by the signal processing unit (7) and converts it into the corresponding digital voltage measurement signal V. c (t) and V c (t+ t), and determine the linear segment to which the current measurement time belongs, then the industrial computer (1) compares V c (t) and V c (t+ The value of t): when At that time, V c (t)-V c (t+ When t)> 0, the industrial computer (1) controls the electro-acoustic element to sound and outputs a warning sound signal; when At that time, V c (t)-V c (t+ When t) < 0, the industrial computer (1) controls the electro-acoustic element to sound and outputs a warning sound signal; when hour, >K1, the industrial computer (1) controls the electro-acoustic element to sound and output a warning sound signal; the value range of K1 is 8% ~ 30%; when At that time, V c (t)-V c (t+ If t) < 0, the industrial computer (1) controls the electro-acoustic element to sound and outputs a warning sound signal.

6. The method for monitoring the cutting signal of the feeder blade according to claim 2, characterized in that: In step (5), at measurement time t and At time t, the industrial computer (1) determines the linear segment to which the current measurement time belongs, determines the voltage signal calculation formula for the corresponding segment from the cutting signal prediction model, and then calculates the voltage signal after passing through the segment. The predicted voltage signal V of the time-cut signal prediction model y (t+ t), then compare this signal with the digital voltage measurement signal V. c (t+ The value of t): when hour, >K2, the industrial computer (1) controls the electro-acoustic element to sound and output a warning sound signal; the value of K2 is 8% ~ 20%.

Images