Detector for measuring density of steel cord

Abstract

The invention discloses a detector for measuring the density of a steel cord, and relates to the technical field of rubber framework material detection, and the detector comprises a detection probe which is used for sensing the magnetic intensity of the steel cord and converting the magnetic intensity into an electric signal; the signal processing unit is connected with the detection probe and is used for amplifying and filtering the electric signal; the control unit is provided with a parameter input module and is used for setting upper and lower limit thresholds of the magnetic intensity and analyzing the processed electric signal; the alarm unit is used for triggering an alarm when the detection value exceeds the threshold range; the detection probe is installed behind the cutting process of the steel cord production line through an elastic support and comprises a plurality of magnetic induction intensity detection heads, the detection probe is of a differential electromagnetic induction structure and comprises at least three Hall sensors arranged in a triangular shape, and the adjustable range of the detection distance is 5-15 mm. The detector for measuring the density of the steel cord adopts an advanced electronic circuit and an optimized detection probe, and compared with a traditional detection method, the detector for measuring the density of the steel cord can more accurately detect the density of the steel cord.

Description

Technical Field

[0001] The present invention relates to the technical field of rubber skeleton material detection, and specifically to a detector for measuring the density of steel cord. Background Art

[0002] As the fastest-growing and most widely used variety in rubber skeleton materials, the quality of steel cord directly affects the performance and safety of rubber products such as tires. During the production process of steel cord, the density of the cut steel cord is a key quality indicator. At present, there are many deficiencies in the detection methods for the density of steel cord. Traditional detection methods often rely on manual experience and simple tools, with low detection accuracy and slow efficiency, unable to meet the requirements of large-scale industrial production. Moreover, some existing detection devices lack accurate magnetic intensity detection and flexible upper and lower limit adjustment functions, making it difficult to accurately judge whether the density of steel cord is qualified, resulting in unqualified products flowing into subsequent production links, increasing production costs and reducing product quality. Summary of the Invention

[0003] The purpose of the present invention is to provide a detector for measuring the density of steel cord to solve the problems raised in the above background art.

[0004] To achieve the above purpose, the present invention provides the following technical solution: A detector for measuring the density of steel cord, comprising: A detection probe for sensing the magnetic intensity of the steel cord and converting it into an electrical signal; A signal processing unit connected to the detection probe for amplifying and filtering the electrical signal; A control unit provided with a parameter input module for setting the upper and lower limit thresholds of the magnetic intensity and analyzing the processed electrical signal; An alarm unit for triggering an alarm when the detected value exceeds the threshold range; The detection probe is installed behind the cutting process of the steel cord production line through an elastic bracket and includes multiple magnetic induction intensity detection heads.

[0005] Further, the detection probe adopts a differential electromagnetic induction structure, including at least three Hall sensors arranged in a triangle, and the adjustable range of the detection spacing is 5 - 15 mm.

[0006] Further, the signal processing unit includes: A preamplifier with an adjustable gain range of 40 - 60 dB; A band-pass filter with a center frequency of 1 kHz and a bandwidth of ±200 Hz; An AD conversion module with a sampling rate of not less than 10 kSPS.

[0007] Further, the control unit is built with a difference calculation algorithm to judge the cord uniformity by comparing the signal differences of multiple detection heads, and the range of the difference threshold can be set from 0.5V to 3V.

[0008] Further, the alarm unit outputs simultaneously: RS485 digital signal to the host computer; Digital input signal to the audible and visual alarm; 4-20mA analog signal to the PLC.

[0009] Further, it also includes a temperature compensation module which uses a DS18B20 sensor to monitor the ambient temperature in real time, and the compensation coefficient is 0.5% / °C.

[0010] The present invention provides a detector for measuring the density of steel cord, having the following beneficial effects: By adopting advanced electronic circuits and optimized detection probes, compared with traditional detection methods, it can detect the density of steel cord more accurately, can conveniently adjust the upper and lower limits of magnetic strength according to the quality standards of different steel cord products, has strong adaptability, and the fast alarm system can prompt unqualified products in the first time, avoiding unqualified products from entering the next production process, reducing production costs and improving production efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 It is a schematic flow structure diagram of a detector for measuring the density of steel cord according to the present invention. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0012] The following further describes in detail the embodiments of the present invention in conjunction with the drawings and embodiments. The following embodiments are used to illustrate the present invention, but cannot be used to limit the scope of the present invention.

[0013] As Figure 1, A detector for measuring the density of steel cord, comprising: a detection probe for sensing the magnetic intensity of the steel cord and converting it into an electrical signal. Three Honeywell SS49E linear Hall sensors are used, arranged in an equilateral triangle. The sensors are installed in a 304 stainless steel housing, and a magnetic alloy magnetic conduction sheet is provided at the front end. The detection probe is specially designed with high sensitivity and anti-interference ability, and can stably sense the magnetic intensity of the steel cord; a signal processing unit connected to the detection probe to amplify and filter the electrical signal. The signal processing unit performs processing such as amplification and filtering on the electrical signal to improve the accuracy and stability of the signal; a control unit equipped with a parameter input module for setting the upper and lower limit thresholds of the magnetic intensity and analyzing the processed electrical signal; an alarm unit that triggers an alarm when the detected value exceeds the threshold range. The alarm unit uses an audible and visual alarm method, including emitting a flashing light and a loud alarm sound to prompt the operator that the steel cord is unqualified; the detection probe is installed behind the cutting process of the steel cord production line through an elastic bracket and includes multiple magnetic induction intensity detection heads.

[0014] The detection probe adopts a differential electromagnetic induction structure, including at least three Hall sensors arranged in a triangle, and the adjustable range of the detection spacing is 5 - 15 mm.

[0015] The signal processing unit includes: a preamplifier with an adjustable gain range of 40 - 60 dB; a band-pass filter with a center frequency of 1 kHz and a bandwidth of ±200 Hz; an AD conversion module with a sampling rate not less than 10 kSPS.

[0016] The control unit has a built-in difference calculation algorithm to judge the uniformity of the cord by comparing the signal differences of multiple detection heads. The adjustable range of the difference threshold is 0.5 - 3 V.

[0017] The alarm unit outputs simultaneously: an RS485 digital signal to the host computer; a digital input / output signal to the audible and visual alarm; a 4 - 20 mA analog signal to the PLC.

[0018] It also includes a temperature compensation module that uses a DS18B20 sensor to monitor the ambient temperature in real time, and the compensation coefficient is 0.5% / ℃.

[0019] Install the detection probe at a suitable position after the cutting process on the steel cord production line to ensure stable detection of the steel cord. Through the operation interface of the control unit, input the upper and lower limit setting values of the magnetic intensity according to the standard density requirements of the steel cord. When the steel cord moves past the detection probe on the production line, the electronic circuit in the detection probe senses its magnetic intensity and converts it into an electrical signal, which is transmitted to the signal processing unit. After amplifying and filtering the electrical signal, the signal processing unit sends it to the control unit. The control unit compares the received processed signal with the set upper and lower limits of the magnetic intensity. If the signal exceeds the upper and lower limit range, the control unit immediately triggers the alarm unit to notify the operator that the steel cord here is unqualified.

[0020] The embodiments of the present invention are given for purposes of illustration and description, and are not exhaustive or limit the invention to the disclosed form. Many modifications and variations are obvious to those of ordinary skill in the art. The embodiments are chosen and described in order to best explain the principles of the invention and its practical application, and to enable those of ordinary skill in the art to understand the invention and design various embodiments with various modifications suitable for a particular purpose.

Claims

1. A detector for measuring the density of steel cord, characterized in that, Including: A detection probe, which is used to sense the magnetic strength of the steel cord and convert it into an electrical signal; A signal processing unit, connected to the detection probe, for amplifying and filtering the electrical signal; A control unit, provided with a parameter input module, for setting the upper and lower limit thresholds of the magnetic strength and analyzing the processed electrical signal; An alarm unit, which triggers an alarm when the detected value exceeds the threshold range; The detection probe is installed behind the cutting process of the steel cord production line through an elastic bracket, and includes a plurality of magnetic induction intensity detection heads.

2. The detector for measuring the density of steel cord according to claim 1, wherein, The detection probe adopts a differential electromagnetic induction structure, including at least three Hall sensors arranged in a triangle, and the adjustable range of the detection distance is 5-15 mm.

3. The detector for measuring the density of steel cord according to claim 1, wherein, The signal processing unit includes: A preamplifier, with an adjustable gain range of 40-60 dB; A band-pass filter, with a center frequency of 1 kHz and a bandwidth of ±200 Hz; An AD conversion module, with a sampling rate of not less than 10 kSPS.

4. A detector for measuring the density of steel cord according to claim 1, characterized in that, The control unit internally has a difference calculation algorithm, and judges the uniformity of the cord by comparing the signal differences of multiple detection heads. The adjustable range of the difference threshold is 0.5-3 V.

5. The detector for measuring the density of steel cord according to claim 1, characterized in that, The alarm unit outputs simultaneously: An RS485 digital signal to the upper computer; A digital input / output signal to the audible and visual alarm; A 4-20 mA analog signal to the PLC.

6. The detector for measuring the density of steel cord according to claim 5, wherein, It also includes a temperature compensation module, which uses a DS18B20 sensor to monitor the ambient temperature in real time, and the compensation coefficient is 0.5% / °C.

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