Voltage frequency conversion device and diaphragm defect detection system

Abstract

The embodiment of the utility model discloses a voltage frequency conversion device and a diaphragm defect detection system. The voltage frequency conversion device comprises a first analog voltage input module which is used for receiving an analog voltage signal provided by the outside and carrying out analog-to-digital conversion to generate a digital voltage signal; the first programmable logic controller is used for performing signal type conversion on the digital voltage signal to generate a single-ended pulse signal; and the differential module is used for performing differential conversion on the single-ended pulse signal to generate a differential pulse signal. According to the embodiment of the utility model, the problems of low precision, poor stability and inconvenience in debugging of a traditional transmitter module device are solved, the stability and the reliability of signals are improved, and the speed of a machine and the actual position of a defect can be accurately obtained by detection equipment in real time, so that the accuracy and the efficiency of diaphragm defect detection are improved.

Description

TECHNICAL FIELD

[0001] The embodiment of the utility model relates to diaphragm defect detection technical field, especially a kind of voltage frequency conversion device and diaphragm defect detection system. BACKGROUND

[0002] Diaphragm is the microporous film that is used to separate positive and negative pole, prevent two pole contact short circuit, simultaneously allow lithium ion to pass in lithium ion battery.

[0003] In diaphragm defect detection process, to confirm the scanning position of diaphragm defect, generally using transmitter module to detect the input voltage of conveying belt, the running speed of conveying belt is calculated by preset conversion relationship, and then the scanning position of diaphragm defect is confirmed.

[0004] However, transmitter module can convert the analog voltage of equipment into frequency signal, output to diaphragm detection equipment, but there are problems of low device precision, poor stability and inconvenient debugging. UTILITY MODEL CONTENTS

[0005] The utility model provides a kind of voltage frequency conversion device and diaphragm defect detection system to solve the problems of low device precision, poor stability and inconvenient debugging of existing transmitter module.

[0006] First, the utility model embodiment provides a kind of voltage frequency conversion device, comprising:

[0007] First analog voltage input module includes analog voltage input end and digital voltage output end, analog voltage input end receives the analog voltage signal provided by outside, and digital voltage output end outputs the digital voltage signal generated after analog-digital conversion by analog voltage signal;Analog voltage signal and digital voltage signal are linearly related;

[0008] First programmable logic controller includes voltage signal input end and single-ended pulse signal output end, voltage signal input end is electrically connected with the digital voltage output end of first analog voltage input module, and single-ended pulse signal output end outputs the single-ended pulse signal generated after signal type conversion by digital voltage signal;Wherein, the frequency of single-ended pulse signal and digital voltage signal are linearly related;

[0009] Difference module includes single-ended pulse signal input end and differential pulse signal output end, single-ended pulse signal input end is electrically connected with the single-ended pulse signal output end of first programmable logic controller, and differential pulse signal output end outputs the differential pulse signal generated after difference conversion by single-ended pulse signal;Wherein, the frequency of differential pulse signal is same with the frequency of single-ended pulse signal.

[0010] Optionally, the frequency P of the single-ended pulse signal and the digital voltage signal D satisfy the following conditions: Uc=Umax / Dmax*D+K, P=(Pmax / Umax)*Uc+0.5; wherein Uc is an analog voltage signal corrected by the first programmable logic controller according to the digital voltage signal, Umax is the maximum analog voltage signal value, Dmax is the preset maximum digital voltage signal, K is a compensation coefficient adopted by the first programmable logic controller during correction, and Pmax is the preset maximum frequency of the single-ended pulse signal.

[0011] The first programmable logic controller further comprises a debugging terminal, which receives an external debugging signal and is used for correcting the value of K.

[0012] Optionally, the analog voltage input terminal of the first analog voltage input module receives an externally provided analog voltage signal through a first cable.

[0013] The voltage signal input terminal of the first programmable logic controller is electrically connected to the digital voltage output terminal of the first analog voltage input module through a second cable.

[0014] The single-ended pulse signal input terminal of the differential module is electrically connected to the single-ended pulse signal output terminal of the first programmable logic controller through a third cable.

[0015] The differential pulse signal output terminal of the differential module outputs a differential pulse signal to the outside through a fourth cable.

[0016] Optionally, at least one of the first cable, the second cable, the third cable and the fourth cable is provided with an electromagnetic shielding layer, and the electromagnetic shielding layer is grounded.

[0017] Optionally, the first analog voltage input module comprises an alarm flag output terminal, which outputs an alarm signal generated when the analog voltage signal exceeds a preset range.

[0018] The first programmable logic controller further comprises an output control terminal, which is electrically connected to the alarm flag output terminal of the first analog voltage input module, and the single-ended pulse signal output terminal selects an output according to the alarm signal input by the output control terminal.

[0019] Optionally, the system further comprises a switching module, an input terminal of the switching module is electrically connected to the differential pulse signal output terminal of the differential module, and an output terminal of the switching module outputs the differential pulse signal provided by the differential module.

[0020] Optionally, the differential pulse signal output terminal comprises a forward signal output terminal and a reverse signal output terminal, and the differential pulse signal comprises a forward signal and a reverse signal.

[0021] The switch module comprises an intermediate relay, the intermediate relay comprising a first common pin, a second common pin, a first normally open contact pin and a second normally open contact pin;

[0022] The first common pin is electrically connected to a positive signal output end of the differential module, and the first normally open contact pin outputs a positive signal provided by the differential module; the second common pin is electrically connected to a negative signal output end of the differential module, and the second normally open contact pin outputs a negative signal provided by the differential module; or,

[0023] The first normally open contact pin is electrically connected to a positive signal output end of the differential module, and the first common pin outputs a positive signal provided by the differential module; the second normally open contact pin is electrically connected to a negative signal output end of the differential module, and the second common pin outputs a negative signal provided by the differential module.

[0024] In a second aspect, the utility model embodiment further provides a diaphragm defect detection system, including diaphragm machine table, diaphragm defect detection equipment and the voltage frequency conversion device in the first aspect;

[0025] The analog voltage input end of the first analog voltage input module in the voltage frequency conversion device is electrically connected to the diaphragm machine table, and receives an analog voltage signal output by the diaphragm machine table; wherein the analog voltage signal has a linear relationship with the speed of the diaphragm machine table conveying the diaphragm;

[0026] The differential pulse signal output end of the differential module in the voltage frequency conversion device is electrically connected to the diaphragm defect detection equipment, and outputs a differential pulse signal to the diaphragm defect detection equipment;

[0027] The diaphragm defect detection equipment calculates the speed of the diaphragm machine table conveying the diaphragm according to the frequency of the differential pulse signal, to determine the real-time detection position of the diaphragm.

[0028] Optionally, the diaphragm machine table comprises a frequency converter, a second analog voltage input module, a second programmable logic controller and an analog voltage output module;

[0029] The second analog voltage input module is electrically connected to the frequency converter and the second programmable logic controller respectively, and the analog voltage output module is electrically connected to the second programmable logic controller;

[0030] The frequency converter is used to drive the motor to convey the diaphragm;

[0031] The second analog voltage input module is used to obtain the working voltage of the frequency converter;

[0032] The second programmable logic controller is used to determine the conveying speed of the diaphragm according to the working voltage of the frequency converter;

[0033] Analog voltage output module is used for converting the conveying speed of the diaphragm into an analog voltage signal output in a preset mapping relationship.

[0034] Optionally, the diaphragm defect detection device comprises a metering plate card and an image detection system.

[0035] The metering plate card is electrically connected with the differential module and the image detection system respectively, and is used for converting the conveying speed of the diaphragm according to the frequency of the differential pulse signal provided by the differential module, and providing the image detection system to synchronize positioning of the detected image.

[0036] The first analog voltage input module provided by the embodiment of the utility model, including analog voltage input terminal and digital voltage output terminal, analog voltage input terminal receives the analog voltage signal provided by outside, digital voltage output terminal outputs the digital voltage signal generated after analog-digital conversion of analog voltage signal, first analog voltage input module improves the digital processing ability of signal through analog-digital conversion, strengthens the anti-interference of signal. The first programmable logic controller comprises a voltage signal input end and a single-ended pulse signal output end, the voltage signal input end is electrically connected with the digital voltage output end of the first analog voltage input module, and the single-ended pulse signal output end outputs a single-ended pulse signal generated after signal type conversion of the digital voltage signal. The digital voltage signal is converted into a single-ended pulse signal by the first programmable logic controller, which is convenient for subsequent counting and processing. At the same time, the linear relationship between the digital voltage signal and the single-ended pulse signal is adjusted, the device can adapt to different test speeds, and the following property and adjustability of the device are enhanced. The differential module comprises a single-ended pulse signal input end and a differential pulse signal output end, the single-ended pulse signal input end is electrically connected with the single-ended pulse signal output end of the first programmable logic controller, and the differential pulse signal output end outputs a differential pulse signal generated after differential conversion of the single-ended pulse signal. The single-ended pulse signal is converted into a differential pulse signal by the differential module, the consistency of the signal frequency is maintained, the anti-interference ability of the signal in the transmission process is enhanced, the stability and reliability of the signal are improved, and it is ensured that the detection device can obtain the speed of the machine and the actual position of the defect in real time and accurately, so that the accuracy and efficiency of the diaphragm defect detection are improved. BRIEF DESCRIPTION OF DRAWINGS

[0037] Figure 1 A structure schematic view of a voltage frequency conversion device provided by the embodiment of the utility model;

[0038] Figure 2 A structure schematic view of a diaphragm defect detection system provided by the embodiment of the utility model;

[0039] Figure 3 A schematic view of analog signal and digital signal conversion relationship provided by the embodiment of the utility model;

[0040] Figure 4 A structure diagram of another voltage frequency conversion device provided by the embodiment of the present application is shown in the figure.

[0041] Figure 5 A structure diagram of another diaphragm defect detection system provided by the embodiment of the present application is shown in the figure.

[0042] Figure 6 A structure diagram of another diaphragm defect detection system provided by the embodiment of the present application is shown in the figure. DETAILED DESCRIPTION

[0043] The present application will be further described below in conjunction with the drawings and embodiments. It can be understood that the specific embodiments described herein are only used to explain the present application, but not to limit the present application. In addition, it should be noted that, in order to facilitate the description, only the parts related to the present application are shown in the drawings, but not all the structures.

[0044] Figure 1 A structure diagram of a voltage frequency conversion device provided by the embodiment of the present application is shown in the figure, Figure 2 A structure diagram of a diaphragm defect detection system provided by the embodiment of the present application is shown in the figure, Figure 3 A structure diagram of a diaphragm defect detection system provided by the embodiment of the present application is shown in the figure, Figure 4 A structure diagram of another voltage frequency conversion device provided by the embodiment of the present application is shown in the figure, Figure 5 A structure diagram of another diaphragm defect detection system provided by the embodiment of the present application is shown in the figure, Figure 6 A structure diagram of another diaphragm defect detection system provided by the embodiment of the present application is shown in the figure.

[0045] As Figure 1 shown, the voltage frequency conversion device 100 comprises:

[0046] The first analog voltage input module 10 comprises an analog voltage input end 11 and a digital voltage output end 12. The analog voltage input end 11 receives an externally provided analog voltage signal, and the digital voltage output end 12 outputs a digital voltage signal generated after analog-digital conversion of the analog voltage signal. The analog voltage signal and the digital voltage signal are in a linear relationship.

[0047] The first analog voltage input module 10 can be understood as a device for converting an analog voltage signal into a digital signal. The analog voltage input end 11 can be understood as a device for receiving an external (such as a sensor) analog voltage signal. Figure 2The diaphragm machine 200 shown provides an input interface for analog voltage signals; the digital voltage output terminal 12 can be understood as an output port for outputting digital voltage signals; the analog voltage signal can be understood as a voltage signal output by the diaphragm machine 200 to reflect the speed of the machine.

[0048] Specifically, the analog voltage input terminal 11 receives the analog voltage signal from the diaphragm machine 200. The analog-to-digital converter in the first analog voltage input module 10 converts the received analog voltage signal into a digital voltage signal, and then the digital voltage output terminal 12 outputs the converted digital signal to the first programmable logic controller 20.

[0049] For example, such as Figure 3 The analog-to-digital signal conversion relationship shown is linear. Assume the analog voltage received by the first analog voltage input module 10 is Uc (V), and the maximum input analog voltage is Umax (V). The current digital value of the digital voltage signal converted by the first analog voltage input module 10 is D, and the maximum digital value Dmax corresponds to the maximum input analog voltage. The relationship between analog voltage and digital signal is: Uc = Umax / Dmax * D.

[0050] The first programmable logic controller 20 includes a voltage signal input terminal 21 and a single-ended pulse signal output terminal 22. The voltage signal input terminal 21 is electrically connected to the digital voltage output terminal 12 of the first analog voltage input module 10. The single-ended pulse signal output terminal 22 outputs a single-ended pulse signal generated by signal type conversion of the digital voltage signal. The frequency of the single-ended pulse signal is linearly related to the digital voltage signal.

[0051] The first programmable logic controller 20 can be understood as a device controller with a built-in program algorithm for generating control pulse signals from digital signals; the voltage signal input terminal 21 can be understood as an input interface for receiving digital voltage signals from the first analog voltage input module 10; the single-ended pulse signal output terminal 22 can be understood as an output port for outputting single-ended pulse signals; the single-ended pulse signal can be understood as a signal composed of a reference signal and a periodic pulse signal, and the pulse frequency of the single-ended pulse signal is linearly related to the speed of the diaphragm machine, that is, the faster the speed, the more pulses are generated per unit time.

[0052] Specifically, the first programmable logic controller 20 receives the digital voltage signal from the first analog voltage input module 10 through the voltage signal input terminal 21, and converts the input analog voltage signal into a pulse signal through the built-in program of the first programmable logic controller 20, and sends the speed of the diaphragm machine 200 to the differential module 30 in the form of pulses.

[0053] For example, assume that the speed of the detection device to be determined is V (m / min). The analog voltage received by the first analog voltage input module 10 is Uc (V), and the maximum input analog voltage is Umax (V). The digital quantity of the digital voltage signal converted by the first analog voltage input module 10 is D, and the maximum digital quantity Dmax corresponding to the maximum input analog voltage. The frequency of the pulse signal is P (i.e., the number of pulses per second), and the maximum pulse frequency is Pmax. The relationship between the frequency of the pulse signal and the digital quantity is: P = Pmax / Dmax*D + 0.5. Here, 0.5 is an offset or compensation term used to ensure that when the digital quantity D is zero, the pulse frequency P is not zero.

[0054] The difference module 30 includes a single-ended pulse signal input end 31 and a differential pulse signal output end 32. The single-ended pulse signal input end 31 is electrically connected to the single-ended pulse signal output end 22 of the first programmable logic controller, and the differential pulse signal output end 32 outputs a differential pulse signal generated by differential conversion of the single-ended pulse signal. The frequency of the differential pulse signal is the same as that of the single-ended pulse signal.

[0055] The difference module 30 can be understood as a device for converting a single-ended pulse signal into a differential pulse signal. The single-ended pulse signal input end 31 can be understood as an interface for receiving a single-ended pulse signal from the first programmable logic controller 20. The differential pulse signal output end 32 can be understood as an output port for outputting a differential signal to the diaphragm defect detection device 300. The differential conversion can be understood as a process of converting a single-ended signal into a differential signal. The differential pulse signal can be understood as a group of signals transmitted by two wires, with equal amplitudes but opposite polarities.

[0056] Specifically, when the difference module 30 receives the pulse signal output by the first programmable logic controller 20, it converts the single-ended signal into two signals with equal amplitudes and opposite phases, which are transmitted to the diaphragm defect detection device 300 through two lines. The differential signal format can effectively resist common-mode interference and improve the stability and reliability of the signal.

[0057] Optionally, the frequency P of the single-ended pulse signal and the digital voltage signal D satisfy the following conditions: Uc = Umax / Dmax*D + K, P = (Pmax / Umax)*Uc + 0.5; where Uc is the analog voltage signal corrected by the first programmable logic controller 20 according to the digital voltage signal, Umax is the maximum analog voltage signal value, Dmax is the preset maximum digital voltage signal, K is the compensation coefficient used by the first programmable logic controller 20 when correcting, and Pmax is the preset maximum frequency of the single-ended pulse signal. The first programmable logic controller 20 further includes a debugging end 24 that receives an external debugging signal for correcting the value of K.

[0058] wherein the 0.5 in P = (Pmax / Umax) * Uc + 0.5 can be understood as an offset or compensation term. Exemplarily, the offset or compensation term can be used to ensure that the pulse frequency P is not zero when the digital quantity D is zero. The debug signal can be understood as a correction signal obtained by presetting or external control, and the correction signal includes an offset or compensation term. Exemplarily, the correction signal can be 0.5, and when the correction signal is 0.5, P = (Pmax / Umax) * Uc + 0.5. The compensation coefficient K used by the first programmable logic controller 20 for correction in Uc = Umax / Dmax * D + K can be understood as a compensation term for correcting errors or non-linear factors. For example, if the speed of the diaphragm machine 200 and / or the analog voltage do not adapt to the preset linear relationship, after adjusting the linear relationship between them, the Uc obtained by further optimizing the K value can make the first programmable logic controller 20 output a more accurate frequency signal.

[0059] Specifically, when the first analog voltage input module 10 receives the analog voltage signal from the diaphragm machine 200, the analog-to-digital converter in the first analog voltage input module 10 converts the received analog voltage signal into a digital voltage signal through the conversion formula Uc = Umax / Dmax * D + K, and then the first programmable logic controller 20 converts the input digital voltage signal into a pulse signal through the relationship P = (Pmax / Umax) * Uc + 0.5, and finally the first programmable logic controller 20 sends the speed of the diaphragm machine 200 to the differential module 30 in the form of a pulse. By adjusting the output voltage, reducing electromagnetic interference, and improving the accuracy and stability of the system. By increasing the offset, it is ensured that even in the absence of an input signal (D = 0), the system can generate a non-zero pulse frequency, further improving system stability.

[0060] In an alternative embodiment, as shown in Figure 4 the analog voltage input end 11 of the first analog voltage input module 10 receives an externally provided analog voltage signal through the first cable 41;

[0061] the voltage signal input end 21 of the first programmable logic controller 20 is electrically connected to the digital voltage output end 12 of the first analog voltage input module 10 through the second cable 42;

[0062] the single-ended pulse signal input end 31 of the differential module 30 is electrically connected to the single-ended pulse signal output end 22 of the first programmable logic controller 20 through the third cable 43;

[0063] the differential pulse signal output end 32 of the differential module 30 outputs a differential pulse signal to the outside through the fourth cable 44.

[0064] Specifically, the first cable 41 is used for connecting the analog voltage input end 11 and the cable of the external signal source, for transmitting the analog voltage signal. The second cable 42 is used for connecting the voltage signal input end 21 and the digital voltage output end 12, for transmitting the digital voltage signal. The third cable 43 is used for connecting the single-ended pulse signal input end 31 and the single-ended pulse signal output end 22, for transmitting the single-ended pulse signal. The fourth cable 44 is used for connecting the differential pulse signal output end 32 and the external device, and outputs the differential pulse signal.

[0065] Optionally, at least one of the first cable 41, the second cable 42, the third cable 43 and the fourth cable 44 is provided with an electromagnetic shielding layer, and the electromagnetic shielding layer is grounded.

[0066] Wherein, the electromagnetic shielding layer can be understood as a kind of conductive material wrapped outside the cable, its main function is to prevent or reduce the interference of external electromagnetic field to the internal signal of the cable.

[0067] Specifically, the first cable 41, the second cable 42, the third cable 43 and the fourth cable 44 outside can be provided with a shielding layer, and the shielding layer is extended to the ground to further ensure the accuracy of the collected pulse number.

[0068] Optionally, as shown in Figure 4 The first analog voltage input module 10 includes an alarm flag output end 13, and the alarm flag output end 13 outputs an alarm signal generated when the analog voltage signal exceeds the preset range.

[0069] The first programmable logic controller 20 further includes an output control end 23, and the output control end 23 is electrically connected with the alarm flag output end 13 of the first analog voltage input module. The single-ended pulse signal output end 22 selects the output according to the alarm signal input by the output control end 23.

[0070] Wherein, the alarm flag output end 13 can be understood as an output interface of the first analog voltage input module 10, for outputting an alarm signal when the analog voltage signal exceeds the preset range; the output control end 23 can be understood as an input interface of the first programmable logic controller 20, for receiving the alarm signal from the alarm flag output end 13, and controlling other outputs according to the signal; the alarm signal can be understood as a signal indicating that the analog voltage signal exceeds the safety or preset range, for triggering the alarm or safety measures.

[0071] Specifically, when the voltage detected by the first analog voltage input module 10 exceeds a preset safety range (such as 24V), the alarm flag output end 13 will generate an alarm signal. The output control end 23 receives the alarm signal from the alarm flag output end 13, and decides the output of the single-ended pulse signal output end 22 according to the signal. For example, the single-ended pulse signal output end 22 stops outputting the pulse signal, or changes the output mode, so as to timely issue a warning or take other corresponding control measures, thereby protecting the safety of personnel and the normal operation of equipment.

[0072] In an optional embodiment, as shown in Figure 5 The voltage frequency conversion device 100 further includes a switch module 50, an input end 51 of the switch module 50 is electrically connected with the differential pulse signal output end 32 of the differential module 30, and an output end 52 outputs the differential pulse signal provided by the differential module 30.

[0073] The switch module 50 can be understood as an electronic component arranged between the differential module 30 and the detection device 300 for controlling the transmission of signals. Through the switch module 50, the transmission of signals can be selectively allowed or blocked when needed.

[0074] Specifically, the output end 52 of the switch module 50 will decide whether to allow the transmission of the differential pulse signal according to the state of the input signal (such as the state of the operation button). When the diaphragm machine 200 is running, the switch module 50 allows the signal to pass; when the diaphragm machine 200 is stopped or abnormal, the switch module 50 receives a shutdown signal or an alarm signal, and the switch module 50 blocks the signal transmission.

[0075] In an optional embodiment, as shown in Figure 6 The differential pulse signal output end 32 includes a forward signal output end 321 and a reverse signal output end 322, and the differential pulse signal includes a forward signal and a reverse signal.

[0076] The switch module 50 includes an intermediate relay 60, and the intermediate relay 60 includes a first common pin 61, a second common pin 62, a first normally open contact pin 63, and a second normally open contact pin 64.

[0077] The first common pin 61 is electrically connected with the forward signal output end 321 of the differential module 30, and the first normally open contact pin 63 outputs the forward signal provided by the differential module 30; the second common pin 62 is electrically connected with the reverse signal output end 322 of the differential module 30, and the second normally open contact pin 64 outputs the reverse signal provided by the differential module 30; or,

[0078] The first normally open contact pin 63 is electrically connected with the positive signal output end 321 of the differential module 30, and the first common pin 61 outputs the positive signal provided by the differential module 30; the second normally open contact pin 64 is electrically connected with the negative signal output end 322 of the differential module 30, and the second common pin 62 outputs the negative signal provided by the differential module 30.

[0079] The intermediate relay 60 can be understood as an electronic component arranged between the differential module 30 and the detection device 300 for controlling the transmission of signals; the first common pin 61 and the second common pin 62 can be understood as fixed connection points on the intermediate relay, which are respectively connected with the positive and negative signal output ends of the differential module; the first normally open contact pin 63 and the second normally open contact pin 64 can be understood as output ends corresponding to the first common pin 61 and the second common pin 62.

[0080] Specifically, the intermediate relay 60 includes a relay coil, and when the relay coil is not powered, the intermediate relay is in an open state, the first common pin 61 is disconnected with the first normally open contact pin 63, and the second common pin 62 is disconnected with the second normally open contact pin 64; after the relay coil is powered and closed, a path is formed between the first common pin 61 and the first normally open contact pin 63, and a path is formed between the second common pin 62 and the second normally open contact pin 64, thereby controlling the transmission of signals.

[0081] The first analog voltage input module converts the analog voltage signal output by the diaphragm machine into a digital voltage signal, and corrects the system error or non-linear factors, ensuring the linear relationship between the analog voltage signal and the digital voltage signal. The first programmable logic controller receives the digital voltage signal and converts it into a single-ended pulse signal that is linearly related to the diaphragm machine speed. By using the differential module to convert the single-ended pulse signal into a differential pulse signal, common mode interference is effectively resisted, and the stability and reliability of the signal during transmission are improved. Through the above steps, the speed of the diaphragm machine is followed, and the diaphragm detection error caused by speed mismatch is reduced. In addition, by correcting the analog voltage of the first analog voltage input module and adjusting the conversion coefficient between the pulse signal frequency and the digital quantity in the first programmable logic controller, the adaptation of different working conditions of the diaphragm machine is realized.

[0082] As Figure 2The utility model discloses an embodiment further provides a diaphragm defect detection system, including diaphragm machine platform 200, diaphragm defect detection equipment 300 and voltage frequency conversion device 100 in above -mentioned embodiment, and the analog voltage input end 11 of first analog voltage input module 10 in voltage frequency conversion device 100 is electrically connected with diaphragm machine platform 200, receives the analog voltage signal of diaphragm machine platform 200 output;Wherein, analog voltage signal and the speed of diaphragm machine platform 200 transmission diaphragm are linearly related;The differential pulse signal output end 32 of differential module 30 in voltage frequency conversion device 100 is electrically connected with diaphragm defect detection equipment 300, and diaphragm defect detection equipment 300 is output differential pulse signal;Diaphragm defect detection equipment 300 calculates the speed of diaphragm machine platform 200 transmission diaphragm according to the frequency of differential pulse signal to determine the real -time detection position of diaphragm.

[0083] Wherein, diaphragm machine platform 200 can be understood as the transmission equipment for transporting diaphragm;Diaphragm defect detection equipment 300 can be understood as the equipment for detecting whether diaphragm exists defect;The speed of diaphragm machine platform 200 transmission diaphragm can be understood as the length of the distance that diaphragm is passed in unit time when diaphragm machine platform 200 drives diaphragm to move;The real -time detection position of diaphragm can be understood as the relative position of diaphragm defect detection equipment 300 relative to diaphragm machine platform 200.

[0084] Specifically, diaphragm machine platform 200, voltage frequency conversion device 100 and diaphragm defect detection equipment 300 are connected in turn, ensure that analog voltage signal can be accurately transmitted to voltage frequency conversion device 100, and finally convert into differential pulse signal and transmit to diaphragm defect detection equipment 300.Diaphragm defect detection equipment 300 calculates the pulse number per second according to the mapping relationship between real -time pulse frequency P and the speed V of diaphragm machine platform transmission diaphragm, obtains the speed of diaphragm machine platform 200 transmission diaphragm to determine the real -time detection position of diaphragm.

[0085] Exemplarily, assuming that the speed V of diaphragm machine platform 200 transmission diaphragm ranges in 0-320m / min, and pulse frequency P is in 0-50KHZ, at this time, the mapping relationship of pulse frequency P and the speed V of diaphragm machine platform transmission diaphragm is as follows: V=(320m / min / 60s / 50Khz)(P60).

[0086] Optionally, diaphragm machine platform 200 includes frequency converter 210, second analog voltage input module 220, second programmable logic controller 230 and analog voltage output module 240;

[0087] Second analog voltage input module 220 is electrically connected with frequency converter 210 and second programmable logic controller 230 respectively, and analog voltage output module 240 is electrically connected with second programmable logic controller 230;

[0088] The frequency converter 210 is used to drive the motor to convey the diaphragm;

[0089] The second analog voltage input module 220 is used to acquire the working voltage of the frequency converter 210;

[0090] The second programmable logic controller 230 is used to determine the conveying speed of the diaphragm according to the working voltage of the frequency converter 210;

[0091] The analog voltage output module 240 is used to convert the conveying speed of the diaphragm into an analog voltage signal output in a preset mapping relationship.

[0092] The frequency converter 210 can be understood as a speed controller that adjusts the speed of the motor by changing the power supply frequency of the motor to achieve diaphragm conveying speed adjustment; the second analog voltage input module 220 can be understood as a module for acquiring the input voltage of the frequency converter 210; the programmable logic controller 230 can be understood as a module that converts the received voltage value into a corresponding diaphragm conveying speed value according to a pre-set voltage-speed mapping relationship; and the analog voltage output module 240 can be understood as a module that converts the diaphragm conveying speed information output by the second programmable logic controller 230 into an analog voltage signal and outputs it according to a pre-set speed-analog voltage mapping relationship.

[0093] Specifically, the frequency converter 210 drives the motor to operate, thereby driving the diaphragm to move along the detection line. The voltage input module 220 acquires the working voltage value of the frequency converter in real time. The second programmable logic controller 230 converts the working voltage of the frequency converter 210 into a corresponding diaphragm conveying speed value through the mapping relationship between the working voltage of the frequency converter 210 and the motor speed (the conveying speed of the diaphragm). Finally, the analog voltage output module 240 converts the conveying speed of the diaphragm into an analog voltage signal that can be transmitted in a circuit in a preset mapping relationship, and outputs it externally, so that other devices (such as the voltage frequency conversion device 100) can receive the analog voltage signal, thereby realizing the association and cooperative work between different parts of the entire system based on the speed signal.

[0094] Optionally, the diaphragm defect detection device 300 includes meter plate cards 310 and an image detection system 320;

[0095] The meter plate cards 310 are electrically connected with the differential module 30 and the image detection system 320, respectively, and are used to convert the conveying speed of the diaphragm according to the frequency of the differential pulse signal provided by the differential module 30, and provide it to the image detection system 320 to synchronize the positioning of the detected image.

[0096] The metering plate card 310 can be understood as a module for calculating the real-time detection position of the diaphragm according to the pulse frequency P; and the image detection system 320 can be understood as a module for performing image acquisition and detecting whether the diaphragm has defects.

[0097] Specifically, when the image detection system 320 detects that the diaphragm has defects, the current time node is recorded immediately. At the same time, the metering plate card 310 also calculates the distance moved by the diaphragm from the moment when the diaphragm starts to move to the time period when the image detection system 320 detects that the diaphragm has defects according to the preset calculation rule. Then, the calculated distance value is marked as the real-time detection position of the diaphragm, so as to subsequently locate and trace the position of the diaphragm having defects.

[0098] For example, assuming that the speed V of the diaphragm machine conveying the diaphragm ranges from 0 to 320 m / min, the pulse frequency P ranges from 0 to 50 KHZ, the current time is recorded as t when the diaphragm is detected to have defects, and the time when the diaphragm starts to move is t0. At this time, the mapping relationship between the pulse frequency P and the speed V of the diaphragm machine conveying the diaphragm is: V=(320 m / min / 60 s / 50 Khz)*(P*60). The real-time detection position of the diaphragm is calculated according to the formula: L=(V*(t-t0)) / 60.

[0099] The diaphragm defect detection system provided by the embodiment of the utility model, including diaphragm machine, voltage frequency conversion device and diaphragm defect detection equipment. Diaphragm machine exports analog voltage signal outward, voltage frequency conversion device converts the analog voltage signal that diaphragm machine exports into pulse signal, diaphragm defect detection equipment is positioned to the defect position while detecting diaphragm defect through the real-time detection position of diaphragm that pulse frequency calculates, ensures that the detection equipment can real-time and accurately obtain the speed of machine and the actual position of defect and the actual position of defect, thereby improve the accuracy and efficiency of diaphragm defect detection.

[0100] Note that the above is only the preferred embodiment of the utility model and the technical principle applied. Those skilled in the art will understand that the utility model is not limited to the specific embodiments described herein, and those skilled in the art can make various obvious changes, re-adjustment, mutual combination and replacement without departing from the protection scope of the utility model. Therefore, although the utility model is explained in more detail through the above embodiments, the utility model is not limited to the above embodiments, and can include more other equivalent embodiments without departing from the utility model concept. The scope of the utility model is determined by the appended claims.

Claims

1. A voltage frequency conversion apparatus, characterized by, The voltage frequency conversion device comprises: a first analog voltage input module comprising an analog voltage input end and a digital voltage output end, the analog voltage input end receiving an externally provided analog voltage signal, and the digital voltage output end outputting a digital voltage signal generated after analog-digital conversion of the analog voltage signal; the analog voltage signal and the digital voltage signal being in linear relationship; a first programmable logic controller comprising a voltage signal input end and a single-ended pulse signal output end, the voltage signal input end being electrically connected with the digital voltage output end of the first analog voltage input module, and the single-ended pulse signal output end outputting a single-ended pulse signal generated after signal type conversion of the digital voltage signal; wherein the frequency of the single-ended pulse signal is in linear relationship with the digital voltage signal; a differential module comprising a single-ended pulse signal input end and a differential pulse signal output end, the single-ended pulse signal input end being electrically connected with the single-ended pulse signal output end of the first programmable logic controller, and the differential pulse signal output end outputting a differential pulse signal generated after differential conversion of the single-ended pulse signal; wherein the frequency of the differential pulse signal is the same as the frequency of the single-ended pulse signal.

2. The voltage frequency conversion apparatus of claim 1, wherein, The frequency P of the single-ended pulse signal and the digital voltage signal D satisfy the following conditions: Uc=Umax / Dmax*D+K, P=(Pmax / Umax)*Uc+0.5; wherein Uc is an analog voltage signal corrected by the first programmable logic controller according to the digital voltage signal, Umax is the maximum analog voltage signal value, Dmax is the preset maximum digital voltage signal, K is a compensation coefficient adopted by the first programmable logic controller during correction, and Pmax is the preset maximum frequency of the single-ended pulse signal; The first programmable logic controller further comprises a debugging end receiving an external debugging signal for correcting the value of K.

3. The voltage frequency conversion device according to claim 1, wherein the analog voltage input end of the first analog voltage input module receives the externally provided analog voltage signal through a first cable; the voltage signal input end of the first programmable logic controller is electrically connected with the digital voltage output end of the first analog voltage input module through a second cable; the single-ended pulse signal input end of the differential module is electrically connected with the single-ended pulse signal output end of the first programmable logic controller through a third cable; the differential pulse signal output end of the differential module outputs the differential pulse signal to the outside through a fourth cable.

4. The voltage frequency conversion apparatus of claim 3, wherein At least one of the first cable, the second cable, the third cable and the fourth cable is provided with an electromagnetic shielding layer, and the electromagnetic shielding layer is grounded.

5. The voltage frequency conversion apparatus of claim 1, wherein, The first analog voltage input module comprises an alarm flag output end outputting an alarm signal generated when the analog voltage signal exceeds a preset range. The first programmable logic controller further comprises an output control end, which is electrically connected with the alarm flag output end of the first analog voltage input module, and the single-ended pulse signal output end selects output according to the alarm signal input by the output control end.

6. The voltage frequency conversion apparatus of claim 1, wherein, Further comprising a switch module, an input end of the switch module is electrically connected with the differential pulse signal output end of the differential module, and an output end outputs the differential pulse signal provided by the differential module.

7. The voltage frequency conversion device according to claim 6, wherein, The differential pulse signal output end comprises a forward signal output end and a reverse signal output end, and the differential pulse signal comprises a forward signal and a reverse signal; The switch module comprises an intermediate relay, and the intermediate relay comprises a first common pin, a second common pin, a first normally open contact pin and a second normally open contact pin; The first common pin is electrically connected with the forward signal output end of the differential module, and the first normally open contact pin outputs the forward signal provided by the differential module; the second common pin is electrically connected with the reverse signal output end of the differential module, and the second normally open contact pin outputs the reverse signal provided by the differential module; or, The first normally open contact pin is electrically connected with the forward signal output end of the differential module, and the first common pin outputs the forward signal provided by the differential module; the second normally open contact pin is electrically connected with the reverse signal output end of the differential module, and the second common pin outputs the reverse signal provided by the differential module.

8. A system for detecting defects in a diaphragm, the system comprising: The voltage frequency conversion device comprises a diaphragm machine, a diaphragm defect detection device and the voltage frequency conversion device according to any one of claims 1-7. The analog voltage input end of the first analog voltage input module in the voltage frequency conversion device is electrically connected with the diaphragm machine, and receives an analog voltage signal output by the diaphragm machine; wherein the analog voltage signal is in linear relationship with the speed of the diaphragm machine conveying diaphragm. The differential pulse signal output end of the differential module in the voltage frequency conversion device is electrically connected with the diaphragm defect detection device, and outputs the differential pulse signal to the diaphragm defect detection device. The diaphragm defect detection device calculates the speed of the diaphragm machine conveying diaphragm according to the frequency of the differential pulse signal, so as to determine the real-time detection position of the diaphragm.

9. The system for detecting defects in a diaphragm of claim 8, wherein, The diaphragm machine comprises a frequency converter, a second analog voltage input module, a second programmable logic controller and an analog voltage output module. The second analog voltage input module is electrically connected with the frequency converter and the second programmable logic controller respectively, and the analog voltage output module is electrically connected with the second programmable logic controller. The frequency converter is used for driving a motor to convey diaphragm. The second analog voltage input module is used for acquiring the working voltage of the frequency converter. The second programmable logic controller is used for determining the conveying speed of the diaphragm according to the working voltage of the frequency converter. The analog voltage output module is configured to convert the conveying speed of the diaphragm into an analog voltage signal output according to a preset mapping relationship.

10. The system for detecting defects in a diaphragm of claim 8, wherein, The diaphragm defect detection device comprises a metering plate card and an image detection system. The metering plate card is electrically connected with the differential module and the image detection system, respectively, and is configured to convert the conveying speed of the diaphragm according to the frequency of the differential pulse signal provided by the differential module, and provide the conveying speed to the image detection system to synchronize the positioning of the detected image.

Images