CN220483295U

CN220483295U - Axle temperature alarm system detection device

Info

Publication number: CN220483295U
Application number: CN202321392176.7U
Authority: CN
Inventors: 刘怡; 刘靖; 张果; 邹生敏; 郭勇; 朱彦平; 李渊; 周福顺; 樊孝斌; 刘泽雪; 龙步斌; 徐斌; 祁磊; 洪泽平
Original assignee: Institute of Science and Technology of China Railway Wuhan Group Co Ltd
Current assignee: Institute of Science and Technology of China Railway Wuhan Group Co Ltd
Priority date: 2022-12-01
Filing date: 2023-06-02
Publication date: 2024-02-13
Anticipated expiration: 2033-06-02

Abstract

The utility model relates to a detection device of a shaft temperature alarm system, which comprises a control unit and a temperature simulation circuit, wherein the temperature simulation circuit comprises an adjustable resistor unit and a first switch unit, the output end of a resistance control signal of the control unit is connected with the input end of the adjustable resistor unit, the output end of the adjustable resistor unit is connected with one end of a switch channel of the first switch unit, the output end of a switch signal of the control unit is connected with the control end of the first switch unit, and the other end of the switch channel of the first switch unit is used for being connected with the temperature detection input end of the shaft temperature alarm system; the control unit is pre-stored with a temperature-resistance relation curve, outputs a resistance control signal according to the temperature-resistance relation curve, and also outputs a first switch control signal; the adjustable resistance unit outputs a corresponding voltage signal according to the resistance control signal; the first switch unit is used for inputting a voltage signal into a temperature detection input end of the shaft temperature alarm system according to a first switch control signal. The device is simple to operate and high in detection efficiency.

Description

Axle temperature alarm system detection device

Technical Field

The utility model relates to the technical field of detection devices, in particular to a detection device of a shaft temperature alarm system.

Background

Along with the development of high-speed railways, the number of high-speed motor train units is continuously increased, and people pay more attention to the running safety of the high-speed motor train units. The safety guide is fully reflected when the high-speed motor train unit is designed, and the safety monitoring function is set for each system or key component, so that in the processes of whole motor train unit assembly, performance debugging, maintenance testing and the like, fault test is required for each safety link, the test looks like a simple test, and the safety pulse of the whole motor train unit is related in practice.

The motor train unit axle temperature alarm system is one of important components of the safety protection system, and is characterized in that a temperature sensor is arranged on a motor train unit bogie axle, a gear box, a traction motor and other equipment, early warning and alarm temperature values are set in the system, axle temperature real-time display and monitoring are carried out through a train network, early warning or alarm is carried out when the temperature exceeds the corresponding temperature, and a car control instruction is input through a network system, so that the running safety of the motor train unit is ensured. Therefore, whether the axle temperature alarm system of the motor train unit operates normally is particularly important for the safe operation of the motor train unit.

When the motor train unit is overhauled, the functional state of the main machine of the motor train unit shaft temperature alarm system is required to be detected so as to verify whether the main machine timely reacts to the abnormal shaft temperature condition to alarm. According to the original debugging method, a hot air gun is used for baking and heating the sensor installation part, the temperature rise is simulated, and the alarm function is verified.

Disclosure of Invention

Based on the expression, the utility model provides a detection device of a shaft temperature alarm system, which aims to solve the problems that the traditional detection mode is complex in operation and low in detection efficiency, and the service life of a temperature sensor is attenuated due to the adoption of a hot air heating mode.

The technical scheme for solving the technical problems is as follows:

an axle temperature alarm system detection device, comprising: the temperature simulation circuit comprises an adjustable resistance unit and a first switch unit, wherein the resistance control signal output end of the control unit is connected with the input end of the adjustable resistance unit, the output end of the adjustable resistance unit is connected with one end of a switch channel of the first switch unit, the switch signal output end of the control unit is connected with the control end of the first switch unit, and the other end of the switch channel of the first switch unit is used for being connected with the temperature detection input end of the shaft temperature alarm system; wherein,

the control unit is pre-stored with a temperature-resistance relation curve, outputs a resistance control signal according to the temperature-resistance relation curve, and also outputs a first switch control signal;

the adjustable resistance unit outputs a corresponding voltage signal according to the resistance control signal;

the first switch unit is used for inputting the voltage signal into the temperature detection input end of the shaft temperature alarm system according to a first switch control signal.

Compared with the prior art, the technical scheme of the application has the following beneficial technical effects: when the host function of the shaft temperature alarm system is detected, the resistance change of the adjustable resistance unit is controlled through a preset temperature-resistance relation curve to simulate the voltage change caused by temperature rise detected by the temperature sensor, so as to test whether the shaft temperature alarm system of the motor car alarms on the condition of abnormal temperature rise. The device can replace special equipment for manual baking, and realizes accurate control of shaft temperature simulation, thereby rapidly completing the function detection of a main machine of a shaft temperature alarm system. The utility model simplifies the complicated degree of the test operation, reduces the equipment cost and the labor cost of the test, and avoids the damage to the service life of the temperature sensor in the traditional test process.

On the basis of the technical scheme, the utility model can be improved as follows.

Further, the device comprises a plurality of temperature simulation circuits, the temperature simulation circuits are respectively in communication connection with the control unit, and the output ends of the temperature simulation circuits are in one-to-one correspondence with a plurality of temperature detection input ends of the shaft temperature alarm system.

After the technical scheme is adopted, the beneficial effects are as follows: the temperature simulation circuits can simulate the temperature rise test process of the temperature sensors which are dispersedly arranged on each part of the motor car, namely the temperature rise test process of the temperature sensors which correspond to the shaft temperature alarm system of the motor car. Each temperature simulation circuit is controlled according to a temperature-resistance relation curve obtained in advance, and any temperature sensor participating in the test in the axle temperature alarm system of the motor car can be simulated by controlling the on-off of the first switch unit in each temperature simulation circuit, so that the host function test of the axle temperature alarm system of the motor car is realized more comprehensively.

Further, the adjustable resistance unit comprises at least two digital potentiometers connected in parallel, the control end of each digital potentiometer is respectively connected with one resistance control signal output end of the control unit, and the output ends of all the digital potentiometers are commonly connected to the switch channel of the first switch unit.

After the technical scheme is adopted, the beneficial effects are as follows: the temperature rise simulation is carried out by adopting a mode that the plurality of digital potentiometers are connected in parallel, and voltage signals of the plurality of digital potentiometers are coupled and output to the host end of the axle temperature alarm system of the motor car in a parallel mode.

Further, the device also comprises a man-machine interaction unit which is in communication connection with the control unit and is used for providing a man-machine interaction page.

After the technical scheme is adopted, the beneficial effects are as follows: the man-machine interaction unit is used for displaying various parameters of the device in real time, such as a temperature value converted according to a resistance value, and can also be used for an operator to set the device, input control parameters and the like, so that the testing process is more visual, and the operation of the testing device is facilitated.

Further, the device also comprises a sensor detection unit, wherein the sensor detection unit comprises a second switch unit and a signal amplification unit, the control end of the second switch unit is connected with the switch signal output end of the control unit, one end of a switch channel of the second switch unit is connected with an external temperature sensor, the other end of the switch channel of the second switch unit is connected with the input end of the signal amplification unit, and the output end of the signal amplification unit is connected with the ADC input end of the control unit;

the second switch unit is used for receiving a temperature detection signal of an external temperature sensor by the control device;

the signal amplifying unit is used for amplifying the input temperature detection signal;

the control unit is used for controlling the on-off state of the second switch unit and comparing the amplified temperature detection signal with a preset threshold value so as to judge the detection accuracy of the external temperature sensor.

After the technical scheme is adopted, the beneficial effects are as follows: the sensor detection unit can be used for detecting whether the temperature sensor outputs an effective detection signal, so that the device can detect whether one end of a main machine of a shaft temperature alarm system of the motor car alarms abnormal temperature rise data or not, and can detect whether the temperature sensor can accurately detect the environment temperature change condition or not, bidirectional of a test process is realized, and the applicability of the detection device is improved.

Further, the second switch unit is a multi-input and single-output analog switch.

After the technical scheme is adopted, the beneficial effects are as follows: the second switch unit adopts a multi-input and single-output analog switch, and can provide one path of temperature sensor detection data at any time by controlling the switching of the switch channels, so that the detection of multiple paths of temperature sensors is realized, the test operation is simplified, and the test efficiency is improved.

Further, the device also comprises a power supply conversion unit, wherein the power supply conversion unit comprises a first-stage conversion module and a second-stage conversion module which are sequentially cascaded, the input end of the first-stage conversion module is connected with a total power supply, the output end of the first-stage conversion module is connected with the input end of the second-stage conversion module, and the output end of the first-stage conversion module and the output end of the second-stage conversion module jointly provide working power supply for the device.

After the technical scheme is adopted, the beneficial effects are as follows: when each module in the device works, multistage working voltage is needed, and the total power supply can be converted into multiple paths of voltages in a grading way through the first-stage conversion module and the second-stage conversion module which are connected in cascade, so that multiple power consumption requirements of the device are met.

Further, the power conversion unit further comprises a power detection module, wherein the input end of the power detection module is connected with the input end of the first-stage conversion module, and the output end of the power detection module is connected with the control unit and is used for comparing the voltage input into the first-stage conversion module with a preset power threshold value so as to judge whether the total power supply is abnormal.

After the technical scheme is adopted, the beneficial effects are as follows: the power supply detection module is arranged at the input end of the first-stage conversion module, and can monitor whether the voltage input into the power supply conversion unit is normal or not from the source so as to prevent the damage of the device caused by the abnormal power supply.

Further, the device comprises a device main body and a PCB arranged in the device main body, wherein the control unit, the temperature simulation circuit and the sensor detection unit are integrated on the PCB; the device is characterized in that a host end interface and a sensor end interface are arranged on the device main body, one end of the host end interface in the device main body is connected with the switch channel of the first switch unit, the other end of the host end interface is used for being connected with the temperature detection input end of the shaft temperature alarm system, and one end of the sensor end interface in the device main body is connected with the switch channel of the second switch unit, and the other end of the sensor end interface is used for being connected with an external temperature sensor.

After the technical scheme is adopted, the beneficial effects are as follows: the monitoring units are integrated on the PCB in the device main body, and the port connected with the temperature sensor and the port connected with the alarm system main body part are respectively integrated on the device main body, so that the miniaturization and portability of the detection device are facilitated, and the testing process can be simplified and the testing efficiency can be improved by simplifying the wiring mode.

Drawings

FIG. 1 is a schematic block diagram of a detection device of a shaft temperature alarm system provided by an embodiment of the utility model;

FIG. 2 is a wiring diagram of a control unit according to an embodiment of the present utility model;

FIG. 3 is a schematic diagram of a temperature simulation circuit according to an embodiment of the present utility model;

FIG. 4 is a wiring diagram of a sensor detection unit according to an embodiment of the present utility model;

fig. 5 is a wiring diagram of a power conversion unit according to an embodiment of the present utility model;

fig. 6 is a schematic perspective view of a detection device of a shaft temperature alarm system according to an embodiment of the present utility model;

fig. 7 is a schematic side structural diagram of a detection device of a shaft temperature alarm system according to an embodiment of the present utility model.

In the drawings, the list of components represented by the various numbers is as follows:

1. the device comprises a device main body, a host end interface, a sensor end interface, a power interface, an SD card slot, a touch screen, a communication port and a power switch, wherein the device main body is 2, the host end interface, the sensor end interface, the power interface, the SD card slot, the touch screen, the communication port and the power switch are 3, and the power switch is 8.

Detailed Description

In order to facilitate an understanding of the present application, a more complete description of the present application will now be provided with reference to the relevant figures. Examples of the present application are given in the accompanying drawings. This application may, however, be embodied in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein in the description of the application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application.

It will be appreciated that spatially relative terms such as "under … …," "under … …," "below," "under … …," "over … …," "above," and the like may be used herein to describe one element or feature's relationship to another element or feature as illustrated in the figures. It will be understood that the spatially relative terms are intended to encompass different orientations of the device in use and operation in addition to the orientation depicted in the figures. For example, if the device in the figures is turned over, elements or features described as "under" or "beneath" other elements would then be oriented "on" the other elements or features. Thus, the exemplary terms "under … …" and "under … …" may include both an upper and a lower orientation. Furthermore, the device may also include an additional orientation (e.g., rotated 90 degrees or other orientations) and the spatial descriptors used herein interpreted accordingly.

It will be understood that when an element is referred to as being "connected" to another element, it can be directly connected to the other element or be connected to the other element through intervening elements. In the following embodiments, "connected" is understood to mean "electrically connected", "communicatively connected", and the like, if the connected circuits, modules, units, and the like have electrical or data transferred therebetween.

As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It will be further understood that the terms "comprises" and/or "comprising," and/or the like, specify the presence of stated features, integers, steps, operations, elements, components, or groups thereof, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, or groups thereof.

As shown in fig. 1, this embodiment provides a detection device for an axle temperature alarm system, including: the temperature simulation circuit comprises an adjustable resistance unit and a first switch unit, wherein the resistance control signal output end of the control unit is connected with the input end of the adjustable resistance unit, the output end of the adjustable resistance unit is connected with one end of a switch channel of the first switch unit, the switch signal output end of the control unit is connected with the control end of the first switch unit, and the other end of the switch channel of the first switch unit is used for being connected with the temperature detection input end of the shaft temperature alarm system; wherein,

It can be appreciated that in order to solve the drawbacks noted in the background art, the present embodiment provides a detection device for an axle temperature alarm system. The detection device can simulate a temperature rise signal of the temperature sensor through the adjustable resistance unit to detect the shaft temperature alarm system of the motor car, for example, whether the alarm system gives an alarm in time under the abnormal condition of temperature rise is tested. According to analysis, the temperature of the motor train unit shaft temperature sensor is detected by adopting a PT100 thermistor, the main component of the motor train unit shaft temperature sensor is platinum, the temperature characteristic is good, the stability is good, the acid and alkali resistance is good, the resistance value is 100 ohms according to the transformation relation between the resistance value of a platinum wire and the temperature, 100 after PT100 represents that the resistance value is 100 ohms at 0 ℃, the linearity of the R/T relation of PT100 is very good, the linearity almost meets the linear relation within-200-600 ℃, and therefore the obtained temperature-resistance relation curve of the temperature sensor can be prestored in a control unit and used as the resistance value control basis of an adjustable resistance unit. When temperature detection is carried out, the PT100 is used for converting temperature change into resistance change, external excitation is added, the temperature change is converted into digital quantity through an AD conversion circuit at the temperature detection input end (namely a host end) of the shaft temperature alarm system according to the voltage division ratio of the PT100, then a corresponding temperature value is calculated by an MCU of the shaft temperature alarm system according to a certain conversion relation, the calculated temperature value is compared with a preset temperature threshold value, and then whether an alarm is sent out is judged. The device is mainly based on the detection principle of PT100, simulates the detection process of a temperature sensor PT100, and when a certain temperature value needs to be simulated by using an adjustable resistance unit, can simulate the detection temperature of the temperature sensor by inquiring the resistance value corresponding to the temperature value in a temperature-resistance relation curve and adjusting the adjustable resistance unit to the resistance value.

When the device detects the host function of the shaft temperature alarm system, the resistance change of the adjustable resistance unit is controlled through a preset temperature-resistance relation curve so as to simulate the temperature rise change process of the resistance of the temperature sensor, and the voltage change caused by temperature rise is detected and input into the host end of the shaft temperature alarm system is compared with a preset threshold value so as to test whether the shaft temperature alarm system of the motor car alarms on the condition of abnormal temperature rise. The device can replace special equipment for manual baking, and realizes accurate control of shaft temperature simulation, thereby rapidly completing the function detection of a main machine of a shaft temperature alarm system. The utility model simplifies the complicated degree of the test operation, reduces the equipment cost and the labor cost of the test, and avoids the damage to the service life of the temperature sensor in the traditional test process.

On the basis of the technical scheme, the embodiment can be further improved as follows.

In one possible implementation manner, as shown in fig. 1, the device includes a plurality of temperature analog circuits, the plurality of temperature analog circuits are respectively in communication connection with the control unit, and the output ends of the plurality of temperature analog circuits are connected with a plurality of temperature detection input ends of the shaft temperature alarm system in a one-to-one correspondence manner.

It can be understood that, because the temperature sensors are installed at a plurality of positions on the bogie wheel axle, the gear box, the traction motor and other equipment of the motor train unit, in order to simulate the temperature rise data of the motor train in operation more truly, the shaft temperature alarm system is tested more accurately in a centralized manner, and the temperature sensors at a plurality of positions need to be simulated. As shown in fig. 1, the temperature simulation circuits provided in this embodiment may simulate the temperature rise test process of the temperature sensors that are dispersedly mounted on each part of the motor car, that is, the temperature rise test process of the temperature sensors that correspond to the shaft temperature alarm system of the motor car. Each temperature simulation circuit is controlled according to a temperature-resistance relation curve obtained in advance, and any temperature sensor participating in the test in the axle temperature alarm system of the motor car can be simulated by controlling the on-off of the first switch unit in each temperature simulation circuit, so that the host function test of the axle temperature alarm system of the motor car is realized more comprehensively.

In one possible implementation manner, the adjustable resistance unit comprises at least two digital potentiometers connected in parallel, the control end of each digital potentiometer is respectively connected with one resistance control signal output end of the control unit, and the output ends of all digital potentiometers are commonly connected with the switch channel of the first switch unit.

It can be understood that the temperature rise simulation is performed by adopting a mode that a plurality of digital potentiometers are connected in parallel, and voltage signals of the digital potentiometers are coupled and output to the host end of the axle temperature alarm system of the motor car in a parallel mode.

More specifically, fig. 2 shows a control unit wiring diagram of the present embodiment, and fig. 3 shows a temperature simulation circuit wiring diagram of the present embodiment. The present embodiment will now be exemplified by a specific circuit configuration.

In this embodiment, as shown in fig. 2, the control unit is implemented by a single chip microcomputer U21 with a model number of STM32F103RDT6 and peripheral circuits thereof. As shown in fig. 3, the adjustable resistance unit of each temperature analog circuit is implemented by adopting two digital potentiometers AD8403ARUI in parallel, and the first switch unit of each temperature analog circuit is implemented by adopting a relay G6K-2F-Y. The singlechip U21 is in half-duplex communication with each digital potentiometer through a three-wire SPI bus communication mode. The principle of each temperature analog circuit is the same, and this embodiment is exemplified by only one temperature analog circuit shown in fig. 3. The positive poles of the working power supplies of the single chip microcomputer U21 and the digital potentiometers are connected with a +5V power supply, the grounding feet of the single chip microcomputer U21 are grounded, all the stationary contacts (B1-B4) of the digital potentiometers are grounded, and all the movable contacts (W1-W4) of the digital potentiometers are short-circuited to serve as temperature signal output ends of analog digital potentiometers. The PB0 pin of the singlechip U21 is connected with the CS chip selection pin of the digital potentiometer U1, and the PA11 pin of the singlechip U21 is connected with the CS chip selection pin of the digital potentiometer U41 and is used for transmitting chip selection signals; the PB9 pin of the singlechip U21 is connected with a +5V power supply through a pull-up resistor R43, and the PB9 pin of the singlechip U21 is connected with the CLK clock signal pin of the digital potentiometer U1 and the CLK clock signal pin of the digital potentiometer U41 respectively after being connected with a resistor R45 in series so as to transmit clock signals; the PB8 pin of the singlechip U21 is connected with a +5V power supply through a pull-up resistor R42, and the PB8 pin of the singlechip U21 is connected with the SDI data transmission pin of the digital potentiometer U1 and the SDI data transmission pin of the digital potentiometer U41 respectively after being connected with a resistor R44 in series, so that half-duplex data transmission is realized. Therefore, three-wire SPI bus communication between the single chip microcomputer U21 and each digital potentiometer is realized, and accordingly resistance change of each digital potentiometer can be controlled through the single chip microcomputer U21, and movable contacts (W1-W4) of the digital potentiometers can output variable analog signals to simulate temperature change.

The movable contacts (W1-W4) of the two digital potentiometers of the adjustable resistance unit are coupled to one relay U6, and then the simulated temperature signal is output to the host end of the shaft temperature alarm system when the switch channel of the relay U6 is conducted. As shown in fig. 3, the digital potentiometer U1 is short-circuited with the movable contacts (W1 to W4) of the digital potentiometer U41, and connected in series with the adjustable resistor R22 to connect the pin 3, pin 5 and pin 6 of the relay U6. The relay U6 is of a model G6K-2F-Y, and is provided with two switch channels and a control coil, and the on-off state of the two switch channels can be controlled through the power-on state of the control coil. The relay U6 is characterized in that a pin 4 and a pin 2 of the relay U6 are arranged at two ends of a first switch channel, and a pin 3 is a movable contact arranged between the pin 4 and the pin 2; the pin 7 and the pin 5 of the relay U6 are both ends of the second switch channel, and the pin 6 is a movable contact arranged between the pin 7 and the pin 5; a control coil is arranged between the No. 1 pin and the No. 8 pin of the relay U6, the No. 1 pin of the relay U6 is connected with a +5V power supply, and the No. 8 pin of the relay U6 is connected with the PC8 pin of the singlechip U21. When the PC8 pin of the singlechip U21 is placed low, the level of the 8 pin of the relay U6 is pulled down, at the moment, current flows through the 1 pin and the 8 pin of the relay U6, the control coil is electrified, and the electromagnetic force drives the movable contact (the 6 pin and the 3 pin) to move because the coil generates an electromagnetic field, so that the 6 pin and the 7 pin of the relay U6 are conducted, and meanwhile, the 2 pin and the 3 pin of the relay U6 are conducted, so that analog signals output by the digital potentiometers U1 and U41 are output to the 2 pin and the 7 pin of the relay U6. Because the No. 2 pin and the No. 7 pin of the relay U6 are connected with the host end interface J4 of the multichannel, the simulated temperature signal can be output to the host end of the shaft temperature alarm system. The two ends of the switch channel of the relay U6 (for example, between the 6 th pin and the 7 th pin) are connected through a resistor R21. The resistor R21 has a larger resistance value, and can keep a relatively stable potential difference at two ends when the switch channel is closed. Meanwhile, the resistor R21 and the adjustable resistor R22 form a group of voltage dividing resistors, and the common node of the resistor R21 and the adjustable resistor R22 can output voltage signals suitable for being received by a host end of the shaft temperature alarm system to the No. 5 pin, the No. 6 pin and the No. 3 pin of the relay U6 by adjusting the resistance value of the adjustable resistor R22. The resistor R31 is used as a pull-down resistor, one end of the resistor is connected with the output end of the digital potentiometer, and the other end of the resistor is grounded, so that the analog signals output by the movable contacts (W1-W4) of the digital potentiometer can be more stable.

In one possible implementation manner, as shown in the block diagram of fig. 1 and the perspective structure diagram of fig. 5, the device further includes a man-machine interaction unit, where the man-machine interaction unit is communicatively connected to the control unit, and is configured to provide a man-machine interaction page.

It will be appreciated that, since the monitoring device is designed for the purpose of developing a mobile device, power consumption, volume, weight and performance of the mobile device are all considered in 3 ways: android development board + touch-sensitive screen 6, linux mainboard + touch-sensitive screen 6, embedded configuration screen. By comparing the factors in all aspects, the characteristics among the three factors are shown in the following table:

comparison item	Android development board	Linux main board	Embedded configuration screen
				Power consumption	High height	Low and low	Low and low
Weight of (E)	340g	150g	180g
				Start-up speed	Slow (1 minute)	Fast (4 seconds)	Fast (3 seconds)
Running environment	Android	Linux kernel	Embedded operating system
				Developing extensibility	Java, C, etc	C. Three-party configuration software	Lua, configuration software
Development cycle	In general	Slow down	Quick-acting toy
				Development cost	In general	Higher height	In general
Expansion interface	Strong strength	In general	Without any means for
				Whether or not to support WiFi	Is that	Is that	Whether or not
Whether or not to support memory card	Is that	Is that	Is that
				Thickness of (L)	About 18mm	About 10mm	About 10mm

After comprehensive comparison of a plurality of parameters, the man-machine interaction unit is designed by selecting the Linux main board and the touch screen, and the man-machine interaction unit has the advantages of small size, light weight and long endurance meeting the selection standard of the project, does not need more maintenance and expansion after successful development, and has relatively low maintenance cost. The man-machine interaction unit is used for displaying various parameters of the device in real time, such as a temperature value converted according to a resistance value, and can also be used for an operator to set the device, input control parameters and the like, so that the testing process is more visual, and the operation of the testing device is facilitated.

Under the premise of realizing the host end test of the shaft temperature alarm system in the above embodiments, the condition that whether the temperature sensor can normally detect the temperature of the detected area or not and the abnormality of the temperature sensor can be found in time can be considered.

In one possible implementation manner, as shown in fig. 1, the device further includes a sensor detection unit, where the sensor detection unit includes a second switch unit and a signal amplification unit, a control end of the second switch unit is connected to a switch signal output end of the control unit, one end of a switch channel of the second switch unit is connected to an external temperature sensor, the other end of the switch channel of the second switch unit is connected to an input end of the signal amplification unit, and an output end of the signal amplification unit is connected to an ADC input end of the control unit;

It can be appreciated that in addition to testing the on-board temperature alarm, the on-board sensor is also required to be tested during the test of the motor train unit, and the testing work includes the correctness of wiring and the availability state of the sensor. In this embodiment, the sensor detection unit may be used to detect whether the temperature sensor outputs an effective detection signal, so that the device may detect whether one end of the main unit of the axle temperature alarm system of the motor car alarms on abnormal temperature rise data, and may also detect whether the temperature sensor can accurately detect environmental temperature change, so as to realize bidirectional testing, and improve applicability of the detection device.

In one possible embodiment, the second switching unit is a multiple-input, single-output analog switch. The second switch unit adopts a multi-way switch, and is provided with a plurality of input ends and an output end, the plurality of input ends of the second switch unit can be connected with a plurality of shaft temperature detection sensors in a one-to-one correspondence manner, the switching of any switch channel is controlled by the control unit, and the detection data of a certain path of temperature sensor is provided at any time, so that the detection of a plurality of paths of temperature sensors is realized, the test operation is simplified, and the test efficiency is improved.

The sensor detection unit will now be illustrated in connection with the circuit principle in a certain implementation scenario. A schematic diagram of the circuit wiring of the sensor detection unit is provided as shown in fig. 4.

As shown in fig. 2 and fig. 4, each vehicle-mounted temperature sensor is connected through a multi-channel interface J5, the second switch unit U31 is a digital control analog switch CD4067, which is a single-pole multi-throw switch, and the on-off of the corresponding channel is controlled by an address code input by an ABCD pin. In this embodiment, 10 temperature sensor detection channels are set through the switch CD4067 and the multi-channel interface J5, and only one path of temperature sensor detection process is used for the subsequent illustration. The signal amplifying unit U32 is used as a high-precision temperature acquisition part, adopts AD623 series chips, and is more preferably AN AD623AN model, and is AN integrated single-power-supply instrument amplifier which can provide full-power-supply amplitude output under the condition of single power supply (+ 3V to +12V). It allows gain programming using a single gain setting resistor for better flexibility. Which conforms to the 8 pin industry standard configuration. In the condition without external resistance, AD623 is set to a single gain (g=1). After the resistor is externally connected, the AD623 can be programmed to set the gain which can be up to 1000 times. AD623 maintains a minimum error by providing an excellent Alternating Current Common Mode Rejection Ratio (ACCMRR) that increases with increasing gain. Line noise and harmonics will remain constant up to 200HZ due to CMRR. It has a wide common-mode input range and can amplify common-mode voltage signals with 150mv below ground. It can still provide excellent performance at dual power supplies (2.5-6V). Low power consumption, wide supply voltage range, full supply amplitude output, makes AD623AN ideal choice for battery power. The full supply amplitude output stage maximizes the dynamic range when operating at low supply voltages. The device can replace a discrete instrument amplifier design, provides good linearity in a minimum space, and has reliable temperature stability.

As shown in fig. 4, pins I0 to I15 of the second switch unit U31 may be used as input ends of 16 switch channels, and respectively connected to the multi-channel interface J5 to input detection signals of a plurality of temperature sensors; the COM pin of the second switch unit U31 is used as an output end of a switch channel of the second switch unit U and is used for outputting a temperature sensor detection signal acquired by the I0 pin of the second switch unit U from the multi-channel interface J5; four address code input pins A, B, C, D of the second switch unit U31 are correspondingly connected with four IO ports (PA 0-PA 2 and PC 3) of the singlechip U21 respectively so as to receive the address codes and control the on-off of the corresponding switch channels. The ground GND of the second switching unit U31 is connected to the +3.3v power supply through the capacitor C1 and the resistor R1, so that the ground GND of the second switching unit U31 is stabilized at a lower voltage. The COM pin of the second switch unit U31 is connected IN series with the resistor R74 and then connected to the IN-phase input terminal in+, +3.3v power supply IN series with the resistor R70 and the resistor R71 and then grounded, the resistor R70 and the resistor R71 form a voltage dividing resistor, the common node of the resistor R70 and the resistor R71 is connected IN series with the resistor R72 and then connected to the inverting input terminal IN-, two ends of the capacitor C37 are respectively connected to the IN-phase input terminal in+ and the inverting input terminal IN-, the gain resistor R73 is connected IN series between the rg+ pin and the RG pin of the signal amplifying unit U32, the positive power supply pin Vcc of the signal amplifying unit U32 is connected with +5v, the negative power supply pin Vss is grounded, the REF pin is grounded, and the common node of the resistor R75 and the resistor R76 is used as the output terminal of the whole sensor detecting unit and connected to the ADC sampling pin PC2 of the single chip microcomputer U21. The common node of resistor R75 and resistor R76 is also connected to ground through filter capacitor C39.

IN the circuit of fig. 4, a resistor R70 and a resistor R71 form a group of voltage-dividing resistors to provide stable voltage signals to the inverting input terminal IN-of the signal amplifying unit U32, the detection signal output by the second switching unit U31 is input into the signal amplifying unit U32 for signal amplification, then reaches the a/D sampling terminal of the singlechip U21 after resistance-capacitance filtering, obtains a temperature value after calculation, and then is output to the touch screen 6 for display IN an RS232 communication mode.

In one possible implementation manner, as shown in fig. 1 and fig. 5, the device further includes a power conversion unit, where the power conversion unit includes a first stage conversion module and a second stage conversion module that are cascaded in sequence, an input end of the first stage conversion module is connected to a main power supply, an output end of the first stage conversion module is connected to an input end of the second stage conversion module, and an output end of the first stage conversion module and an output end of the second stage conversion module provide working power for the device together.

It will be appreciated that the total power source may be a power source externally input to the device or may be a battery provided within the device. The operation of each power utilization module of the device needs a plurality of voltage levels, such as +5V, +3.3V, and the like, and the power conversion unit with multi-stage conversion can convert the voltage of an external input power supply or a battery power supply into multi-stage different voltage outputs so as to meet the various power utilization requirements of each part of the device.

As shown in fig. 5, the first stage conversion module U27 adopts a dc voltage stabilizing chip with model LM317 as an adjustable 3-terminal positive voltage stabilizer, which not only has the simplest form of a fixed three-terminal voltage stabilizing circuit, but also has the characteristic of adjustable output voltage, and in addition, has the advantages of wide voltage regulating range, good voltage stabilizing performance, low noise, high ripple suppression ratio, and the like. The second stage conversion module U26 employs a dc voltage regulator chip, model ASM1117, which has a low voltage differential. After the main power supply is connected with the power switch 8 IN series, the original voltage of +12V is provided for the power conversion unit through the wiring seat K1, the original voltage of +12V is input into the input pin IN of the first-stage conversion module U27, and the input pin IN of the first-stage conversion module U27 is grounded through the capacitors C41 and C42 which are connected IN parallel and used for filtering the input voltage of the first-stage conversion module U27. The output pin OUT of the first-stage conversion module U27 outputs +5V voltage, the output pin OUT of the first-stage conversion module U27 is grounded through a resistor R90 and a resistor R91 which are connected in series, a voltage dividing resistor is formed by connecting the resistor R90 and the resistor R91 in series, and a common node of the resistor R90 and the resistor R91 is connected with an adjustable voltage pin ADJ of the first-stage conversion module U27 and used for adjusting the output voltage of the first-stage conversion module U27. The output pin OUT of the first stage conversion module U27 is connected to the input pin IN of the second stage conversion module U26 to provide +5v voltage input to the second stage conversion module U26, the ground pin GND of the second stage conversion module U26 is grounded, and the output pin OUT of the second stage conversion module U26 outputs +3.3v voltage for powering the device. The output pin OUT of the second stage conversion module U26 is further connected in parallel with a plurality of filter capacitors (C33, C51, C52, C56, C57) for filtering the output voltage of the second stage conversion module U26, so that the output voltage of the second stage conversion module U26 is more stable +3.3v.

In one possible implementation manner, the power conversion unit further includes a power detection module, an input end of the power detection module is connected to an input end of the first stage conversion module, and an output end of the power detection module is connected to the control unit, and is configured to compare a voltage input to the first stage conversion module with a preset power threshold value to determine whether the total power supply is abnormal.

It can be understood that the power supply detection module is arranged at the input end of the first-stage conversion module, and can monitor whether the voltage input into the power supply conversion unit is normal from the source so as to prevent the device from being damaged due to power supply abnormality. As shown in fig. 5, the power detection module includes resistors R79, R80, R81 and a capacitor C45, where the resistors R79 and R80 are serially connected between the +12v power input terminal and ground, one end of the resistor R81 is connected to a common node of the resistor R79 and the resistor R80, and the other end of the resistor R81 is used as an output terminal of the power detection module and connected to a power detection pin PC0 of the single-chip microcomputer U21. The output end of the power detection module is grounded through a capacitor C45 so as to filter the power detection signal.

Because the motor train unit comprises a plurality of motor train sections, a plurality of detection points can be arranged to respectively detect the temperature sensors of the motor train sections, and in order to realize networking of a plurality of detection devices of the motor train unit, a communication network port can be arranged on the detection devices, and the detection data distributed in each carriage is summarized through an optical fiber ring network. As shown in fig. 2, a group of duplex communication channels usarti_tx and usarti_rx are preset on the single chip microcomputer U21, and are connected with a communication port 7 arranged on the device through a socket J1, so as to realize communication connection between the devices.

In one possible embodiment, the device comprises a device body 1 and a PCB disposed within the device body 1, the control unit, the temperature analog circuit and the sensor detection unit being integrated on the PCB; as shown in fig. 6 and 7, the device main body 1 is provided with a host end interface 2 and a sensor end interface 3, one end of the host end interface 2 in the device main body 1 is connected with the switch channel of the first switch unit, the other end of the host end interface is used for being connected with the temperature detection input end of the shaft temperature alarm system, and one end of the sensor end interface 3 in the device main body 1 is connected with the switch channel of the second switch unit, and the other end of the sensor end interface is used for being connected with an external temperature sensor.

It can be understood that each monitoring unit is integrated on the PCB in the device main body 1, and the port connected with the temperature sensor and the port connected with the alarm system host part on the device are respectively integrated on the device main body 1, which is beneficial to miniaturization and portability of the detection device, and can simplify the testing process and improve the testing efficiency by simplifying the wiring mode. An SD card may be further disposed in the device body 1, for storing detection data, and the SD card may be disposed in the SD card slot 5 on the device body 1 in a plug-in manner. The device can directly supply power to the device through a power interface 4 on the device main body 1, and can also charge a battery in the device through the power interface 4. An operator can operate the device through a touch screen 6 arranged on the front surface of the device main body 1, such as setting a temperature value to be simulated, controlling a host end of a certain path of detection data input shaft temperature alarm system, detecting whether the data of a certain path of temperature sensor is normal, and the like.

The detection device of the shaft temperature alarm system provided by the utility model can simulate the temperature data detected by each temperature sensor to test whether the host end of the shaft temperature alarm system carries out alarm reaction on abnormal temperature data or not, can detect whether the temperature sensor can normally detect, and can realize bidirectional detection of the shaft temperature alarm system. When the main machine end of the shaft temperature alarm system is detected, the reliability and the safety of detection are improved, and the detection efficiency is effectively improved. The device replaces the former manual baking mode, reduces potential safety hazards, meanwhile, the manual baking is inaccurate in temperature control, certain errors exist in the test process, and after the device is used, the accurate control of the shaft temperature is realized through a numerical control technology, so that the errors are effectively reduced. The temperature regulation of a channel in the manual baking mode needs 10min, and the temperature regulation speed is high after equipment is adopted, and the temperature regulation can be completed within 1min, so that the function detection of the main machine of the shaft temperature alarm system is completed rapidly. In addition, when temperature rise and temperature difference tests are carried out, temperature comparison adjustment needs to be carried out on a plurality of sensors, manual operation is complex, time consumption is high, and adjustment time can be greatly saved after equipment is adopted.

The utility model simplifies the complicated degree of the test operation, reduces the equipment cost and the labor cost of the test, and avoids the damage to the service life of the temperature sensor in the traditional test process.

The foregoing description of the preferred embodiments of the utility model is not intended to limit the utility model to the precise form disclosed, and any such modifications, equivalents, and alternatives falling within the spirit and scope of the utility model are intended to be included within the scope of the utility model.

Claims

1. An axle temperature alarm system detection device, characterized by comprising: the temperature simulation circuit comprises an adjustable resistor unit and a first switch unit, wherein the output end of a resistance control signal of the control unit is connected with the input end of the adjustable resistor unit, the output end of the adjustable resistor unit is connected with one end of a switch channel of the first switch unit, the output end of a switch signal of the control unit is connected with the control end of the first switch unit, and the other end of the switch channel of the first switch unit is used for being connected with the temperature detection input end of the shaft temperature alarm system; wherein,

2. The shaft temperature alarm system detection device according to claim 1, wherein the adjustable resistance unit comprises at least two digital potentiometers connected in parallel, the control end of each digital potentiometer is connected with one resistance control signal output end of the control unit, and the output ends of all digital potentiometers are commonly connected with the switch channel of the first switch unit.

3. The device for detecting the shaft temperature alarm system according to claim 1, further comprising a man-machine interaction unit, wherein the man-machine interaction unit is in communication connection with the control unit and is used for providing a man-machine interaction page.

4. A shaft temperature alarm system detection device according to any one of claims 1 to 3, further comprising a sensor detection unit, wherein the sensor detection unit comprises a second switch unit and a signal amplification unit, a control end of the second switch unit is connected with a switch signal output end of the control unit, one end of a switch channel of the second switch unit is connected with an external temperature sensor, the other end of the switch channel of the second switch unit is connected with an input end of the signal amplification unit, and an output end of the signal amplification unit is connected with an ADC input end of the control unit;

5. The device for detecting the shaft temperature alarm system according to claim 1, further comprising a power supply conversion unit, wherein the power supply conversion unit comprises a first-stage conversion module and a second-stage conversion module which are sequentially cascaded, the input end of the first-stage conversion module is connected with a total power supply, the output end of the first-stage conversion module is connected with the input end of the second-stage conversion module, and the output end of the first-stage conversion module and the output end of the second-stage conversion module jointly provide working power for the device.

6. The device for detecting a shaft temperature alarm system according to claim 5, wherein the power conversion unit further comprises a power detection module, an input end of the power detection module is connected to an input end of the first stage conversion module, and an output end of the power detection module is connected to the control unit, and is configured to compare a voltage input to the first stage conversion module with a preset power threshold value to determine whether the total power supply is abnormal.

7. The shaft temperature alarm system detection device according to claim 4, characterized in that the device comprises a device body (1) and a PCB arranged in the device body (1), wherein the control unit, the temperature simulation circuit and the sensor detection unit are integrated on the PCB; the device is characterized in that a host end interface (2) and a sensor end interface (3) are arranged on the device main body (1), one end of the host end interface (2) positioned in the device main body (1) is connected with a switch channel of the first switch unit, the other end of the host end interface is used for being connected with a temperature detection input end of the shaft temperature alarm system, and one end of the sensor end interface (3) positioned in the device main body (1) is connected with a switch channel of the second switch unit, and the other end of the sensor end interface is used for being connected with an external temperature sensor.