CN115683346B - Non-contact infrared temperature detector - Google Patents
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- CN115683346B CN115683346B CN202211715146.5A CN202211715146A CN115683346B CN 115683346 B CN115683346 B CN 115683346B CN 202211715146 A CN202211715146 A CN 202211715146A CN 115683346 B CN115683346 B CN 115683346B
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Abstract
The invention discloses a non-contact infrared temperature detector, which comprises three parts, namely a detector shell, an optical assembly and a signal processing circuit board, wherein an optical lens is arranged on the outer shell of the detector, the optical assembly and the signal processing circuit board are arranged in the inner shell of the detector, an optical shutter and a platinum resistor are sequentially arranged between the detector lens and the optical assembly, and the signal processing circuit board is arranged on two sides of the inner shell of the detector; according to the invention, the optical shutter is used for replacing a baffle assembly in the existing vehicle axle temperature intelligent detection system, the optical shutter is arranged in the detector shell, the design volume of the rail side detection box can be reduced, and the miniaturized design of rail side equipment of the vehicle axle temperature intelligent detection system is realized; the optical shutter can solve the problem that the failure rate of a motor in the existing baffle assembly is high, the distance between the rear part of the optical shutter and a calibrated hot target becomes far, the zero calibration reference environment is stable, and the temperature measurement precision of the vehicle axle temperature intelligent detection system is improved.
Description
Technical Field
The invention relates to the technical field of railway vehicle detection devices, in particular to a non-contact infrared temperature detector.
Background
The intelligent detection system for the vehicle axle temperature is used as an important component of a vehicle running safety monitoring system (5T), and utilizes a rail-side non-contact infrared temperature detector (probe) and an intelligent tracking device to detect the bearing temperature and the vehicle number information of a running vehicle in real time, so that tracking and alarming are carried out, and the intelligent detection system is important equipment for finding the vehicle hot axle in time, preventing the hot axle from being cut and ensuring the railway transportation safety.
The vehicle axle temperature intelligent detection system in the prior art is divided into an outdoor rail side device and an indoor device. A detection box in the vehicle axle temperature intelligent detection system is equipment arranged beside a rail. The detection box in the prior art is internally provided with a photon probe for collecting the temperature of an axle, a baffle plate assembly is arranged in front of the photon probe, and the baffle plate assembly mainly comprises three parts: 1. the heat insulation plate and the aluminum baffle plate are provided with a PT100 platinum resistor, a lens cleaning brush and a black matt material PCB; 2. the baffle motor is driving equipment for controlling the opening and closing of the baffle plate; 3. the seven-core aviation plug is connected with a baffle motor power line and a platinum resistor lead.
The main disadvantages of the prior baffle plate assembly are that: 1. the baffle motor has high purchase and maintenance cost. The motor is a purchased product, the market price is about one thousand yuan, and the price is continuously increased; one set of axle temperature detecting system needs 4 baffle motors, and the purchase cost is high, and after the motor broke down, need return the manufacturer and maintain, and time and money cost are great. 2. The failure rate is high. The failure rate of the platinum resistor and the baffle motor is high. 3. The baffle assembly is large in size and occupies the space of the detection box. 4. The assembly process is complicated. The number of the structural members of the baffle plate assembly is 19, the assembly production is needed after the product is purchased to a company, the process is complex, and the average time for producing one set of baffle plate assembly is 1.5 hours; and the whole manual operation is not easy to carry out quality control. 5. The temperature measurement precision is not easy to control. The baffle plate is close to the hot target, and when the hot target is calibrated to be heated to high temperature, the measurement of the temperature of the baffle plate is interfered to a large extent, and the temperature measurement precision is influenced.
Disclosure of Invention
Aiming at the problems in the prior art, the invention aims to provide a non-contact infrared temperature detector with a built-in baffle plate assembly, and solves the problems of large volume, high motor failure rate and influence on temperature measurement precision caused by the fact that the baffle plate assembly is externally arranged and a motor is adopted to drive the baffle plate assembly in the conventional vehicle axle temperature intelligent detection system.
In order to achieve the purpose of the invention, the technical scheme adopted by the invention is as follows: the non-contact infrared temperature detector comprises a detector shell, wherein a gap is formed in the side wall of the detector shell, an optical lens is arranged in the gap, an optical assembly used for non-contact acquisition of infrared light signals is arranged in the detector shell, the optical assembly is aligned with the detector lens, an optical shutter and a platinum resistor are sequentially arranged between the detector lens and the optical assembly, and signal processing circuit boards are arranged on two sides of the detector shell;
a wire passing hole is also formed in the detector shell, and a cable is arranged in the wire passing hole; the optical shutter and the signal processing circuit board are electrically connected with the indoor control box through cables; the signal processing circuit board is integrated with a signal processing circuit, and the signal processing circuit board is electrically connected with the platinum resistor, the photonic device and the like through the signal processing circuit and is used for converting a resistance value signal of the platinum resistor and an optical signal of the photonic device into a circuit signal and outputting the circuit signal to the indoor control box.
The basic principle of the invention is as follows: according to the non-contact infrared temperature detector, the optical shutter is used for replacing a baffle assembly in the existing vehicle axle temperature intelligent detection system, and meanwhile, the optical shutter is arranged inside the detector shell, so that the design volume of a detection box can be reduced, and the miniaturization design of rail side equipment of the vehicle axle temperature intelligent detection system is realized; the optical shutter blades are stable to open and close, the service life is long, the blades do not need to be opened and closed by a motor, and the problem that the motor failure rate of the existing baffle assembly is high can be solved. Meanwhile, due to the built-in design of the optical shutter, the distance between the optical shutter and the calibrated hot target is increased, and the detector lens is arranged in front of the optical shutter for isolation, so that the zero calibration reference environment is stable, and the temperature measurement precision of the vehicle axle temperature intelligent detection system is greatly improved.
When a train passes through equipment of the intelligent detection system for the axle temperature of the train, an optical shutter of the detector is automatically opened in advance to collect infrared optical signals of the axle temperature of the train in a non-contact mode, original electric signals are obtained by utilizing the semiconductor characteristics of a mercury cadmium telluride element in an optical assembly, accurate voltage signals of the axle temperature of the train are output to a detection system host after filtering, amplifying and the like of circuit elements in a signal processing circuit board because the electric signals are very weak and contain much interference, and finally the temperature signals are restored through data processing and software interaction.
Furthermore, as a specific setting mode of the optical assembly, the photonic device in the optical assembly is a mercury cadmium telluride element.
Further, as a specific setting mode of the shutter mounting block, the gap is of a circular structure, the shutter mounting block is arranged in the gap and comprises a cylinder arranged in the gap, a circular mounting groove penetrates through the middle of the cylinder, and the axis of the circular mounting groove is superposed with the axis of the cylinder; the detector lens is fixedly arranged in the circular mounting groove;
a fixing circular plate is arranged on the front surface of the cylinder and is coaxial with the cylinder, a plurality of fixing holes are formed in the fixing circular plate, and the fixing circular plate is fixedly connected with the side wall of the shell of the detector through the plurality of fixing holes;
the optical shutter is fixed on the end surfaces of the two supporting columns through the mounting holes;
a pasting groove is formed in the end face of one supporting column, and the platinum resistor is arranged in the pasting groove.
Furthermore, as a specific setting mode of the optical shutter, the optical shutter comprises a shutter bracket, the shutter bracket is fixedly connected with the end faces of the two support columns through mounting holes, blades are arranged in the shutter bracket, an electromagnetic valve used for driving the blades to open and close is arranged on the shutter bracket, and the electromagnetic valve is electrically connected with an indoor control box through a lead.
Furthermore, the elements on the signal processing circuit board are fixed in a surface-mount packaging manner.
Further, the platinum resistor is PT100 platinum thermistor.
The invention has the beneficial effects that: 1. the non-contact infrared temperature detector provided by the invention realizes the built-in design of the original external baffle assembly by changing the hardware, software and structure as little as possible under the condition that the original function is not changed, and particularly realizes the reduction of the design volume of the detection box and the miniaturization design of the rail-side equipment of the vehicle axle temperature intelligent detection system by arranging the optical shutter in the detector shell.
2. According to the non-contact infrared temperature detector provided by the invention, the end surfaces of the supporting columns are provided with the pasting grooves, the platinum resistors are arranged in the pasting grooves, and the optical shutter is contacted with the end surfaces of the two supporting columns, so that the platinum resistors are tightly attached to the optical shutter, and the temperature of the optical shutter can be accurately measured.
3. According to the non-contact infrared temperature detector provided by the invention, the optical shutter is arranged in the detector shell, so that the distance between the optical shutter and the calibrated hot target is increased, the detector lens is arranged in front of the optical shutter for isolation, the zero calibration reference environment is stable, and the temperature measurement precision of the vehicle axle temperature intelligent detection system is greatly improved.
4. According to the non-contact infrared temperature detector provided by the invention, the traditional external baffle assembly is replaced by the built-in optical shutter, the opening and closing of the blades of the optical shutter are stable, the service life is long, the integration level is high, the structure is simple, the assembly is convenient, meanwhile, the opening and closing of the blades are controlled by the electromagnetic valve, the power is not supplied when the opening or closing state is kept, the power consumption is low, the opening and closing of the blades are realized without using a motor, and the problem of high motor failure rate of the existing baffle assembly can be solved.
Drawings
Fig. 1 is a schematic three-dimensional structure diagram of a non-contact infrared temperature detector.
Fig. 2 is a schematic diagram of an internal cross-sectional structure of a non-contact infrared temperature detector.
Fig. 3 is a schematic three-dimensional structure diagram of the detector shell.
Fig. 4 is a three-dimensional structure diagram of the shutter mounting block.
Fig. 5 is a schematic structural view of the optical shutter.
Fig. 6 is a signal flow schematic block diagram of an intelligent detection device for vehicle axle temperature.
Fig. 7 is a circuit diagram of the temperature conversion circuit.
The method comprises the following steps of 1, a detector shell; 2. a notch; 3. a detector optic; 4. an optical assembly; 5. an optical shutter; 6. a platinum resistor; 7. a signal processing circuit board; 8. a wire passing hole; 9. a shutter mounting block; 10. a cylinder; 11. a circular mounting groove; 12. fixing the circular plate; 13. a fixing hole; 14. a support column; 15. mounting holes; 16. a sticking groove; 17. a shutter bracket; 18. a blade; 19. an electromagnetic valve.
Detailed Description
The following description of the embodiments of the present invention is provided to facilitate the understanding of the present invention by those skilled in the art, but it should be understood that the present invention is not limited to the scope of the embodiments, and it will be apparent to those skilled in the art that various changes may be made without departing from the spirit and scope of the invention as defined and defined in the appended claims, and all matters produced by the invention using the inventive concept are protected.
As shown in fig. 1 to 6, the present invention provides a non-contact infrared temperature detector, which includes a detector casing 1, a notch 2 is formed in a side wall of the detector casing 1, a detector lens 3 is disposed in the notch 2, and an optical assembly 4 for non-contact collecting infrared light signals is disposed in the detector casing 1, preferably but not limited thereto, the photonic device 4 in the optical assembly is a mercury cadmium telluride element.
The optical assembly 4 is aligned with the detector lens 3, and an optical shutter 5 and a platinum resistor 6 are sequentially arranged between the detector lens 3 and the optical assembly 4.
The platinum resistor 6 is a PT100 platinum thermal resistor, and the resistance of the platinum resistor 6 changes with the temperature.
A wire passing hole 8 is also formed in the detector shell 1, and a cable is arranged in the wire passing hole 8; the optical shutter 5 and the signal processing circuit board 7 are electrically connected with the indoor control box through cables; specifically, a socket may be disposed on the wire passing hole 8, the optical shutter 5 and the signal processing circuit board 7 are electrically connected to the socket through a leading-out guide, an aviation plug is disposed at each of two ends of the cable, a socket matched with the aviation plug is disposed on the indoor control box, and the optical shutter 5, the signal processing circuit board 7 and the indoor control box are electrically connected through the aviation sockets at the two ends of the cable.
As shown in fig. 6, a signal processing circuit is integrated in the signal processing circuit board 7, elements on the signal processing circuit board 7 are fixed in a surface mount package manner to reduce the volume of the signal processing circuit board 7, so that a temperature conversion circuit is placed at an unnecessary position, the signal processing circuit board 7 is electrically connected with the platinum resistor 6 through the temperature conversion circuit, the temperature conversion circuit is used for converting a resistance value signal of the platinum resistor 6 into a current signal and outputting the current signal to the indoor control box, and the current signal is sampled and amplified by the indoor control box and then outputs a temperature voltage signal which is displayed in a program interface.
Specifically, as shown in fig. 7, the temperature conversion circuit mainly includes a chip U1, a transistor Q1, resistors R3, R5, R7, and R9, capacitors C1, C3, and C5, and a switching diode D1. The temperature conversion circuit can directly convert the platinum resistance value into a current value, and the accuracy and the efficiency of measuring the temperature of the optical shutter are improved.
In the temperature conversion circuit, a resistor R3 is connected with pins 3 and 4 of U1; the resistor R7 is connected with the pin 2 of the U1 and the pin B of the platinum resistor; the resistor R9 and the capacitor C5 are connected with a pin B of the platinum resistor and a pin 6 of the U1 in parallel; the resistor R5 is connected with a pin A of the platinum resistor and a pin 12 of the U1; the B pole of the triode Q1 is connected with the pin 9 of the U1, and the E pole is connected with the pin 8 of the U1; the anode of the switch diode D1 is connected with a power supply, and the cathode of the switch diode D1 is connected with the C electrode of the triode Q1, the capacitor C3 and the pin 10 of the U1; the capacitor C1 is connected with a power supply VCC and a ground GND; the capacitor C3 is connected with the anode of the switching diode D1, the temperature signal output end and the 7 pin of the U1, and the 5 and 11 pins of the U1 are suspended; pins 13 and 14 of U1 are connected with pin A of the platinum resistor.
The invention provides a non-contact infrared temperature detector, which realizes the built-in design of an original external baffle assembly by changing hard, software and a structure as little as possible under the condition that the original function is not changed, and particularly realizes the miniaturization design of an intelligent vehicle axle temperature detection device by reducing the design volume of a detector shell 1 by arranging an optical shutter 5 in the detector shell 1.
Specifically, as shown in fig. 1 and 4, as a specific arrangement manner of the shutter mounting block 9, the gap 2 is of a circular structure, the shutter mounting block 9 is arranged in the gap 2, the shutter mounting block 9 includes a cylinder 10 arranged in the gap 2, a circular mounting groove 11 is arranged in the middle of the cylinder 10 in a penetrating manner, and an axis of the circular mounting groove 11 coincides with an axis of the cylinder 10; the detector lens 3 is fixedly arranged in the circular mounting groove 11, so that the detector lens 3 is fixedly arranged in front of the optical shutter 5. Because the optical shutter 5 is arranged in the detector shell 1, the distance between the optical shutter 5 and the calibrated hot target is further increased, and the detector lens 3 is arranged in front of the optical shutter 5 for isolation, so that the zero calibration reference environment is stable, and the temperature measurement precision of the vehicle axle temperature intelligent detection device is greatly improved.
A fixed circular plate 12 is disposed on the front surface of the cylinder 10, the fixed circular plate 12 is disposed coaxially with the cylinder 10, a plurality of fixing holes 13 are disposed on the fixed circular plate 12, and the fixed circular plate 12 is fixedly connected to the side wall of the detector housing 1 through the plurality of fixing holes 13. The whole shutter mounting block 9 is fixedly connected with the detector shell 1.
Two supporting columns 14 are arranged on the back of the cylinder 10, the two supporting columns 14 are symmetrically arranged on two sides of the circular mounting groove 11, mounting holes 15 are formed in the two supporting columns 14, and the optical shutter 5 is fixed on the end faces of the two supporting columns 14 through the mounting holes 15, so that the optical shutter 5 and the shutter mounting block 9 are fixedly connected. An adhering groove 16 is formed in the end face of one supporting column 14, and the platinum resistor 6 is arranged in the adhering groove 16. By arranging the pasting grooves 16 on the end surfaces of the supporting columns 14, the platinum resistors 6 are arranged in the pasting grooves 16, the optical shutter 5 is contacted with the end surfaces of the two supporting columns 14, the platinum resistors 6 are tightly attached to the optical shutter 5, the temperature of the optical shutter 5 can be well conducted, and the temperature of the optical shutter 5 can be accurately measured.
As shown in fig. 5, as a specific arrangement mode of the optical shutter 5, the optical shutter 5 includes a shutter bracket 17, the shutter bracket 17 is fixedly connected with end faces of two supporting columns 14 through a mounting hole 15, a blade 18 is arranged inside the shutter bracket 17, an electromagnetic valve 19 for driving the blade 18 to open and close is arranged on the shutter bracket 17, and the electromagnetic valve 19 is electrically connected with an indoor control box through a conducting wire. The blades 18 of the optical shutter 5 can be opened and closed without using a motor, and the problem of high failure rate of the motor of the existing baffle assembly can be solved.
The operating principle of the optical shutter 5 is: the electromagnetic valve 19 is connected with two red control lines and two black control lines, the indoor control box inputs 3.3V high-low level pulse signals to the two red control lines and the two black control lines, and the electromagnetic valve 19 drives the blades 18 to perform diagonal opening and closing actions to achieve the effect of switching on and off the light path of the detector; the working principle of the electromagnetic valve 19 is that like poles repel and opposite poles attract, and the opening and closing of the blade 18 valve are realized by controlling the polarity of the electromagnetic switch. Every time a control signal is input into the optical shutter 5, the valve does not need to be continuously electrified after the magnetism of the valve is changed, and the polarity state of the valve is always kept unchanged.
The optical shutter 5 has the following features: 1. the blade 18 is opened and closed without using a spring, and the function of a high-speed switch is realized by the magnetic repulsion and attraction principle. 2. The ultra-low power consumption is that the power is supplied only when the optical shutter 5 is opened or closed, and the power is not supplied when the shutter is kept in the opened or closed state. 3. And the service life is long. The product switching frequency can reach more than 20 ten thousand times. 4. The high-precision optical shutter has the advantages that the high-precision optical shutter is free from movement in the thrust direction of a mechanical output shaft, light leakage and angle deviation caused by opening and closing of the shutter are avoided, and the characteristic meets the requirement that the optical shutter 5 is used as a zero calibration reference of a baffle system. 5. The size customization is supported, and the customized production can be flexibly carried out according to the required shape and characteristics. The characteristic can meet the requirement that the original detector completes the installation design of the optical shutter 5 and the PT100 platinum resistor 6 under the condition of the least possible structural changes.
In summary, in the vehicle axle temperature intelligent detection device, the optical shutter 5 is used for replacing a baffle assembly in the existing vehicle axle temperature intelligent detection system, and meanwhile, the optical shutter 5 is arranged inside the detector shell 1, so that the design volume of a detection box can be reduced, and the miniaturization design of the rail side equipment of the vehicle axle temperature intelligent detection system is realized; the blades 18 of the optical shutter 5 are stable to open and close, the service life is long, the blades 18 do not need to be opened and closed by a motor, and the problem that the motor failure rate of an existing baffle assembly is high can be solved. Meanwhile, the optical shutter 5 is arranged in the vehicle axle temperature intelligent detection device, so that the distance between the optical shutter 5 and the calibrated hot target is increased, and the detector lens 3 is arranged in front of the optical shutter 5 for isolation, so that the zero calibration reference environment is stable, and the temperature measurement precision of the vehicle axle temperature intelligent detection device is greatly improved.
Claims (3)
1. A non-contact infrared temperature detector is characterized by comprising a detector shell, wherein a gap is formed in the side wall of the detector shell, an optical lens is arranged in the gap, an optical assembly for non-contact acquisition of infrared light signals is arranged in the detector shell, the optical assembly is aligned with the optical lens, an optical shutter and a platinum resistor are sequentially arranged between the optical lens and the optical assembly, and signal processing circuit boards are arranged on two sides of the detector shell;
a wire passing hole is also formed in the detector shell, and a cable is arranged in the wire passing hole; the optical shutter and the signal processing circuit board are electrically connected with the indoor control box through the cable; the signal processing circuit board is electrically connected with the platinum resistor and the photonic device through the signal processing circuit and is used for converting a resistance value signal of the platinum resistor and an optical signal of the photonic device into a circuit signal and outputting the circuit signal to the indoor control box;
the signal processing circuit board is integrated with a signal processing circuit, elements on the signal processing circuit board are fixed in a surface-mounted packaging mode so as to reduce the volume of the signal processing circuit board and enable redundant positions to be reserved for placing a temperature conversion circuit, the signal processing circuit board is electrically connected with a platinum resistor through the temperature conversion circuit, the temperature conversion circuit is used for converting a resistance value signal of the platinum resistor into a current signal and outputting the current signal to an indoor control box, and the current signal is sampled and amplified by the indoor control box and then outputs a temperature voltage signal which is displayed in a program interface;
the temperature conversion circuit comprises a chip U1, wherein the model of the chip U1 is XTR105UA, a triode Q1, resistors R3, R5, R7 and R9, capacitors C1, C3 and C5 and a switching diode D1; the temperature conversion circuit can directly convert the platinum resistance value into a current value, so that the accuracy and efficiency of measuring the temperature of the optical shutter are improved;
in the temperature conversion circuit, a resistor R3 is connected with pins 3 and 4 of U1; one end of the resistor R7 is connected with the pin 2 and the pin 1 of the U1, and the other end of the resistor R7 is connected with the pin B of the platinum resistor; the resistor R9 is connected with the capacitor C5 in parallel with a pin B of the platinum resistor and a pin 6 of the U1; the resistor R5 is connected with a pin A of the platinum resistor and a pin 12 of the U1; the B pole of the triode Q1 is connected with the pin 9 of the U1, and the E pole is connected with the pin 8 of the U1; the anode of the switch diode D1 is connected with a power supply, and the cathode of the switch diode D1 is connected with the C electrode of the triode Q1, the capacitor C3 and the pin 10 of the U1; the capacitor C1 is connected with a power supply VCC and a ground GND; the capacitor C3 is connected with the anode of the switching diode D1, the temperature signal output end and the pin 7 of the U1, and the pins 5 and 11 of the U1 are suspended; pins 13 and 14 of U1 are connected with pin A of the platinum resistor;
the shutter installation block comprises a cylinder arranged in the gap, a circular installation groove penetrates through the middle of the cylinder, and the axis of the circular installation groove is superposed with the axis of the cylinder; the optical lens is fixedly arranged in the circular mounting groove;
a fixed circular plate is arranged on the front surface of the cylinder, the fixed circular plate and the cylinder are coaxially arranged, a plurality of fixing holes are formed in the fixed circular plate, and the fixed circular plate is fixedly connected with the side wall of the detector shell through the plurality of fixing holes;
the optical shutter is characterized in that two support columns are arranged on the back surface of the cylinder, the two support columns are symmetrically arranged on two sides of the circular mounting groove, mounting holes are formed in the two support columns, and the optical shutter is fixed on the end surfaces of the two support columns through the mounting holes;
a pasting groove is formed in the end face of one supporting column, and the platinum resistor is arranged in the pasting groove;
the optical shutter comprises a shutter bracket, the shutter bracket is fixedly connected with the end surfaces of the two support columns through the mounting holes, blades are arranged in the shutter bracket, an electromagnetic valve for driving the blades to open and close is arranged on the shutter bracket, and the electromagnetic valve is electrically connected with an indoor control box through a lead;
and elements on the signal processing circuit board are fixed in a surface-mounted packaging manner.
2. The non-contact infrared temperature detector of claim 1, wherein the photonic device in the optical assembly is a mercury cadmium telluride element.
3. The non-contact infrared temperature probe of claim 1, wherein the platinum resistor is PT100 platinum thermistor.
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| CN116080702B (en) * | 2023-03-13 | 2023-07-04 | 广汉科峰电子有限责任公司 | Intelligent detection system for vehicle axle temperature |
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