Portable overload and unbalanced load signal simulation device

Abstract

The utility model discloses an overload and unbalanced load portable signal simulation device, which comprises a shell and a simulation control circuit arranged in the shell, an input interface is arranged on one side wall of the shell, output interfaces are respectively arranged on three side surfaces of the shell, and a key module is arranged on the outer wall of the top of the shell. The analog control circuit is electrically connected with the input interface, the output interface and the key module respectively, the analog control circuit comprises a controller, a reference voltage module, a power supply module, at least two paths of high-precision DAC converters and a multi-path output module, and the output end of the key module is connected with the input end of the controller. Each control output end of the controller is connected with the input end of one high-precision DAC converter through one corresponding reference voltage module, and the output end of the high-precision DAC converter is connected with one corresponding output interface through one output module. According to the utility model, the problem that the weighing controller channel test cannot be carried out on the overload and unbalanced load site is effectively solved, and a large amount of time cost caused by equipment disassembly is saved.

Description

Technical Field

[0001] The utility model belongs to the technical field of railway freight car detection, and specifically relates to a portable overload and unbalanced load signal simulation device. Background Art

[0002] The overload and unbalanced load detection device for railway freight cars bears the important responsibility of ensuring the safe operation of freight trains during railway transportation. With the continuous promotion and application, the number of overload and unbalanced load devices is increasing. Its core components are 4 weighing controllers, which are responsible for filtering and amplifying the weak signals of the sensors, and each weighing controller has 14 signal processing channels. Due to the poor on-site environment and large electromagnetic interference, the equipment needs to work 24 hours a day. The weighing controller is prone to channel failures. Channel failures will directly affect the accuracy and reliability of the equipment's detection data. In severe cases, it may also cause the overload and unbalanced load detection device to fail to work properly, and overload and unbalanced load conditions cannot be detected, which in turn affects the safety of railway freight cars.

[0003] At present, there are the following problems in the detection of weighing controllers: (1) The detection can only be carried out in the laboratory, and a high-precision millivolt voltage signal is input through a signal generator, and a high-precision multimeter is required to measure, observe and record; (2) Each weighing controller has 14 signal processing channels, and it is necessary to repeat the detection 14 times with the cooperation of two people, which is time-consuming and labor-intensive; (3) When the equipment fails, the channel detection cannot be carried out on site, and it is difficult to implement regular inspections of the signal channels. When the equipment fails, the weighing controller can only be taken back to the laboratory for maintenance. The whole process cycle is long, the cost is high, and it affects the normal operation of the on-site overload and eccentric load device. For this reason, based on the fact that the current overload and eccentric load weighing controller has many signal channels, the weak signal needs to be precisely processed, and the on-site detection is very inconvenient and the equipment maintenance is even more difficult, it is necessary to independently develop a portable overload and eccentric load signal simulation device to solve the practical problems encountered on site. Utility Model Content

[0004] The purpose of the utility model is to provide a portable signal simulation device for overload and unbalanced load. The utility model effectively solves the problem that the weighing controller channel test cannot be performed on site due to overload and unbalanced load, and saves a lot of manpower, material resources and time costs due to equipment disassembly, assembly and transportation. In order to achieve the above purpose, the utility model adopts the following technical effects:

[0005] According to one aspect of the utility model, the utility model provides an over-biased load portable signal simulation device, the simulation device includes a shell and an analog control circuit arranged inside the shell, an input interface is arranged on one side wall of the shell, output interfaces are respectively arranged on the three side surfaces of the shell, and a key module is arranged on the top outer wall of the shell, the analog control circuit is electrically connected to the input interface, the output interface and the key module respectively, the analog control circuit includes a controller, a reference voltage module, a power supply module, at least two high-precision DAC converters and a multi-channel output module, the power supply module is respectively connected to the power supply end of the controller, the power supply end of the reference voltage module and the power supply end of the high-precision DAC converter, the input interface is respectively connected to the input end of the controller and the power supply module, the output end of the key module is connected to the input end of the controller, each control output end of the controller is respectively connected to the input end of a high-precision DAC converter through a corresponding reference voltage module, and the output end of the high-precision DAC converter is connected to a corresponding output interface through an output module.

[0006] The above scheme is further preferred, that the reference voltage module includes an adjustable shunt regulator Z1, a resistor R10, a resistor R11, an adjustable resistor R12 and a capacitor C10, the power output end of the power supply module is connected to one end of the resistor R10, one end of the resistor R10 is respectively connected to one end of the resistor R11, the cathode of the adjustable shunt regulator Z1, one end of the capacitor C10 and the reference power input end of the high-precision DAC, the other end of the resistor R11 is respectively connected to the reference input end of the adjustable shunt regulator Z1 and one end of the adjustable resistor R12, and the anode of the adjustable shunt regulator Z1, one end of the capacitor C10 and the other end of the adjustable resistor R12 are respectively connected to the ground.

[0007] The above scheme is further preferred, that the output module includes a resistor R20, a resistor R21 and a capacitor C20, one end of the resistor R20 is connected to the output end of the high-precision DAC converter, the other end of the resistor R20 is respectively connected to the signal access terminal of the output interface, one end of the resistor R21 and one end of the capacitor C20, and the other end of the capacitor C20, the other end of the resistor R21 and the signal grounding terminal of the output interface are respectively connected to the ground.

[0008] The above scheme is further preferred, wherein the output interface is a DC005 all-copper socket connector or a BNC connector.

[0009] The above solution is further preferred, and indicator lights connected to the controller are respectively provided on both sides of the button module on the top outer wall of the shell.

[0010] The above scheme is further preferred, that the key module includes a touch key switch J30, a resistor R30, a resistor R31, a resistor R32 and a capacitor C30, one end of the resistor R30 is connected to the power output end of the power supply module, one end of the touch key switch J30 is respectively connected to the output end SW of the controller, the other end of the resistor R30, one end of the capacitor C30, and one end of the resistor R31, the other end of the touch key switch J30 is connected to one end of the resistor R32, and the other end of the resistor R32, the other end of the capacitor C30 and the other end of the resistor R31 are respectively connected to the ground.

[0011] The above scheme is further preferred, that the shell consists of an upper shell and a lower shell that are interlocked together, the input interface is arranged on a side wall of the lower shell, a plurality of output interfaces are arranged on three side surfaces of the lower shell respectively, and an anti-slip support rubber pad is arranged on the bottom outer wall of the lower shell.

[0012] In summary, since the utility model adopts the above technical solution, the utility model has the following technical effects:

[0013] (1) The portable signal simulation device of the present application can connect 16 channels at the same time, and detect 14 channels of the weighing controller at one time, which effectively solves the problem that the weighing controller channel test cannot be carried out at the overload site, saves a lot of manpower, material resources and time costs due to equipment disassembly, installation and transportation, and greatly improves the detection efficiency. The channels do not affect each other, and can realize 4-speed voltage switching, which can meet different measurement requirements, can achieve stable and accurate output, and has good anti-interference ability. When the individual channels of the weighing controller are connected to the site for testing, the normal operation of the entire overload device is not affected, and the impact of fault detection on the site is reduced. It can play a huge role in maintaining the safe and reliable operation of the overload detection device, ensuring the transportation safety of freight trains, and reducing the cost of repair and maintenance, and has significant economic and safety benefits;

[0014] (2) The portable signal simulation device of the present application realizes rapid detection, is easy to carry and conduct on-site testing, thereby realizing regular on-site inspections, converting fault repairs into status inspections, and taking preventive measures in advance, effectively improving the operational stability and safety of the overload and unbalanced load device; and can ensure that the fault channel of the weighing controller is quickly detected, realize regular on-site inspections of the overload and unbalanced load detection device of railway freight cars, thereby converting fault repairs into status inspections, and achieving the purpose of early prevention, effectively improving the operational stability and safety of the overload and unbalanced load device, effectively improving the detection efficiency, reducing labor costs, avoiding the impact of fault detection on the normal operation of overload and unbalanced load, effectively improving the operational stability and safety of the overload and unbalanced load detection system, and further safeguarding the safety of railway freight;

[0015] (3) The portable signal simulation device of the present application has strong expansibility. It is not only suitable for the detection of overload weighing controllers, but also can be used for many devices that require millivolt analog voltage signals. It can also be extended to the input test signals of some intelligent sensors, small signal input tests of circuit boards, and other debugging of devices that require precise small signal input. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of the housing structure of a utility model over-biased load portable signal simulation device;

[0017] Figure 2 It is a front view structural schematic diagram of the housing of the utility model;

[0018] Figure 3 It is a right view structural schematic diagram of the housing of the utility model;

[0019] Figure 4 It is a schematic diagram of the top view of the shell of the utility model;

[0020] Figure 5 It is a left-side structural schematic diagram of the housing of the utility model;

[0021] Figure 6 It is a rear view structural schematic diagram of the housing of the utility model;

[0022] Figure 7 It is a control principle diagram of a simulation control circuit of a utility model;

[0023] Figure 8 It is a circuit schematic diagram of a reference voltage module of the utility model;

[0024] Fig. 9 It is a circuit schematic diagram of the output module of the utility model;

[0025] Fig.10 It is a circuit schematic diagram of a utility model key module; DETAILED DESCRIPTION

[0026] In order to make the purpose, technical solution and advantages of the utility model more clear, the utility model is further described in detail below with reference to the accompanying drawings and preferred embodiments. However, it should be noted that many details listed in the specification are only for the purpose of enabling readers to have a thorough understanding of one or more aspects of the utility model, and these aspects of the utility model can be realized even without these specific details.

[0027] like Figures 1 to 6As shown, according to the over-biased load portable signal simulation device provided by the utility model, the simulation device includes a shell 1 and an analog control circuit arranged inside the shell 1, an input interface 2 is arranged on one side wall of the shell 2, output interfaces 3 are arranged on three sides of the shell 2, and a key module 4 is arranged on the top outer wall of the shell 2. The shell 1 is composed of an upper shell and a lower shell that are buckled together, the input interface 2 is arranged on one side wall of the lower shell, and multiple output interfaces 3 are arranged on three sides of the lower shell, and the output interface 3 is a DC005 full copper socket connector or a BNC connector. An anti-skid shock-absorbing support rubber pad 10 is arranged on the bottom outer wall of the lower shell; the analog control circuit is electrically connected to the input interface 2, the output interface 3 and the key module 4 respectively. Indicator lights connected to the controller are arranged on both sides of the key module 4 on the top outer wall of the shell 2, wherein the indicator lights are composed of a power indicator light and an output voltage indicator light (output 3mV, 5mV, 10mV voltage indicator lights). In the present invention, output interfaces 3 are arranged on the left, front and rear sides of the housing 1, that is, a total of 16 output channels are arranged, the right side is the input interface 2, the input interface 2 is the USB power input interface, the upper surface of the housing is the power indicator light, the output voltage indicator light and the key module 4 (voltage setting button) to achieve different voltage switching. The housing 1 is provided with an analog control circuit, which is fixed inside the housing 1, and the bottom surface of the housing 1 is provided with an anti-slip shock-absorbing pad 10.

[0028] like Figure 7 As shown, the analog control circuit includes a controller, a reference voltage module, a power supply module, at least two high-precision DAC converters and a multi-channel output module, the power supply module is respectively connected to the power supply end of the controller, the power supply end of the reference voltage module and the power supply end of the high-precision DAC converter, the power supply module outputs two types of power supplies of 5.0V and 3.3V respectively, the input interface 2 is respectively connected to the input end of the controller and the power supply module, the output end of the key module 4 is connected to the input end of the controller, each control output end of the controller is respectively connected to the input end of a high-precision DAC converter through a corresponding reference voltage module, and the output end of the high-precision DAC converter is connected to a corresponding output interface 3 through an output module; after power-on, by detecting the enable signal of the key module 4, the controller adopts the STM32F030 single-chip microcomputer chip, and the high-precision DAC converter outputs different high-precision voltages after receiving the control signal of the control, so that the controller controls the high-precision DAC module to output different high-precision voltages and displays the corresponding voltage value through the indicator light module. Among them, the output of four high-precision voltage values ​​changes in a cyclic manner, that is, from 0mv→3mv→5mv→10mv→0mv, and the corresponding voltage signal displayed by the indicator light module is: all off→3mV indicator light on→5mV indicator light on→10mV indicator light on→all off.

[0029] In the present utility model, if Figure 8 As shown, the reference voltage module includes an adjustable shunt regulator Z1, a resistor R10, a resistor R11, an adjustable resistor R12 and a capacitor C10, the power output end of the power supply module is connected to one end of the resistor R10, one end of the resistor R10 is respectively connected to one end of the resistor R11, the cathode of the adjustable shunt regulator Z1, one end of the capacitor C10 and the reference power input end of the high-precision DAC converter, the other end of the resistor R11 is respectively connected to the reference input end of the adjustable shunt regulator Z1 and one end of the adjustable resistor R12, the anode of the adjustable shunt regulator Z1, one end of the capacitor C10 and the other end of the adjustable resistor R12 are respectively connected to the ground; the adjustable shunt regulator Z1 uses an analog chip AZ432 as the main control IC of the reference voltage module, the reference voltage of AZ432 itself is 1.248V, and by selecting a suitable peripheral resistor, it generates a high-precision 1.5V reference voltage (accuracy: 1%). The reference voltage VREF is connected to the reference voltage pin of the above-mentioned high-precision DAC module to ensure the accuracy of the high-precision DAC converter. The high-precision DAC converter uses two AD5328 digital-to-analog converter chips as data output channels. Each AD5328 digital-to-analog converter can output 8 DACs, with a total of 16 DACs, which meets the needs of 14-channel signal acquisition of the weighing controller. AD5328 is a 16-pin TSSOP package chip, 12-bit DAC, and when the reference is set to 1.5V, the adjustment step is 1.5V / 4096=0.366mV. Given that only four specifications of 10mV, 5mV, 3mV and 0V need to be output in the application, it can ensure that the 4 voltage signals outputted from each channel meet the requirements of 1% voltage accuracy, thereby meeting the high-precision requirements of the signal simulation system.

[0030] like Fig. 9As shown, the output module includes a resistor R20, a resistor R21 and a capacitor C20, one end of the resistor R20 is connected to the output end of the high-precision DAC converter, the other end of the resistor R20 is respectively connected to the signal access terminal of the output interface 3, one end of the resistor R21 and one end of the capacitor C20, the other end of the capacitor C20, the other end of the resistor R21 and the signal grounding terminal of the output interface 3 are respectively connected to the ground, the signal carrying simulation device of the utility model can realize 16 independent output ports, the previous laboratory detection method can only be a single single channel test, the efficiency is low; using the device, 16 signal tests can be carried out simultaneously, 14 output interfaces 3 can be used at one time to output The signal is applied to the detection channel port of the weighing controller 14 at one time, realizing the detection of 14 channels of the weighing controller, greatly improving the detection efficiency, and each channel meets the high-precision requirements and will not affect each other. The output interface 3 (wiring terminal) adopts the DC005 all-copper socket, which is convenient for wiring and has a long service life. Resistors R20 and R21 divide the output voltage and capacitor C20 filters and decouples the output signal. The channels do not affect each other, which greatly improves the laboratory channel detection efficiency. The device signal has high accuracy and good stability. When the individual channels of the weighing controller are connected on-site for testing, it does not affect the normal operation of the entire set of overload and unbalanced load devices, reducing the impact of fault detection on the site. Regular on-site inspections can be realized, and the post-fault processing is converted into pre-fault detection and prevention, effectively improving the operational stability and safety of the overload and unbalanced load device. The maintenance cost for later use is low.

[0031] In the present utility model, if Fig.10 As shown, the key module 4 includes a touch key switch J30, a resistor R30, a resistor R31, a resistor R32 and a capacitor C30, one end of the resistor R30 is connected to the power output end of the power supply module, one end of the touch key switch J30 is respectively connected to the output end SW of the controller, the other end of the resistor R30, one end of the capacitor C30, and one end of the resistor R31, the other end of the touch key switch J30 is connected to one end of the resistor R32, and the other end of the resistor R32, the other end of the capacitor C30 and the other end of the resistor R31 are respectively connected to the ground; when the touch key switch J30 is pressed, the controller samples a high level, and when the touch key switch J3 is released, the controller samples a low level, and the anti-shake design of the touch key switch J3 is realized by optimizing the detection logic. The controller changes the high-precision voltage value of 0mV→3mV→5mV→10mV→0mV in a cyclic manner according to the number of key presses detected, and the output voltage indicator lights use three LED indicator lights of different colors, which are directly driven by the IO port of the controller. It is used to indicate the current output voltage of the signal simulation device. When all the indicator lights are off, the output is 0V. When only the 3mV indicator light is on, the output is 33mV. When only the 5mV indicator light is on, the output is 5mV. When only the 10mV indicator light is on, the output is 10mV.

[0032] The above is only a preferred embodiment of the utility model. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principle of the utility model. These improvements and modifications should also be regarded as the scope of protection of the utility model.

Claims

1. Overload portable signal simulation device, characterized in that: The simulation device includes a shell and an analog control circuit arranged inside the shell. An input interface is arranged on one side wall of the shell, output interfaces are arranged on three side surfaces of the shell, and a key module is arranged on the top outer wall of the shell. The analog control circuit is electrically connected to the input interface, the output interface and the key module respectively. The analog control circuit includes a controller, a reference voltage module, a power supply module, at least two high-precision DAC converters and a multi-channel output module. The power supply module is respectively connected to the power supply end of the controller, the power supply end of the reference voltage module and the power supply end of the high-precision DAC converter. The input interface is respectively connected to the input end of the controller and the power supply module. The output end of the key module is connected to the input end of the controller. Each control output end of the controller is connected to the input end of a high-precision DAC converter through a corresponding reference voltage module, and the output end of the high-precision DAC converter is connected to a corresponding output interface through an output module.

2. The overload portable signal simulation device according to claim 1, characterized in that: The reference voltage module includes an adjustable shunt regulator, a resistor R10, a resistor R11, an adjustable resistor R12 and a capacitor C10. The power output end of the power supply module is connected to one end of the resistor R10, one end of the resistor R10 is respectively connected to one end of the resistor R11, the cathode of the adjustable shunt regulator, one end of the capacitor C10 and the reference power input end of the high-precision DAC converter, the other end of the resistor R11 is respectively connected to the reference input end of the adjustable shunt regulator and one end of the adjustable resistor R12, and the anode of the adjustable shunt regulator, one end of the capacitor C10 and the other end of the adjustable resistor R12 are respectively connected to the ground.

3. The overload portable signal simulation device according to claim 1, characterized in that: The output module includes a resistor R20, a resistor R21 and a capacitor C20, one end of the resistor R20 is connected to the output end of the high-precision DAC converter, the other end of the resistor R20 is respectively connected to the signal access terminal of the output interface, one end of the resistor R21 and one end of the capacitor C20, the other end of the capacitor C20, the other end of the resistor R21 and the signal grounding terminal of the output interface are respectively connected to the ground.

4. The overload portable signal simulation device according to claim 1 or 3, characterized in that: The output interface is a DC005 all-copper socket connector or a BNC connector.

5. The overload portable signal simulation device according to claim 1, characterized in that: Indicator lights connected to the controller are respectively arranged on both sides of the button module on the outer wall of the top of the shell.

6. The overload portable signal simulation device according to claim 1 or 5, characterized in that: The key module includes a touch key switch J30, a resistor R30, a resistor R31, a resistor R32 and a capacitor C30, one end of the resistor R30 is connected to the power output end of the power supply module, one end of the touch key switch J30 is respectively connected to the output end SW of the controller, the other end of the resistor R30, one end of the capacitor C30, and one end of the resistor R31, the other end of the touch key switch J30 is connected to one end of the resistor R32, and the other end of the resistor R32, the other end of the capacitor C30 and the other end of the resistor R31 are respectively connected to the ground.

7. The overload portable signal simulation device according to claim 1, characterized in that: The shell is composed of an upper shell and a lower shell that are buckled together. The input interface is arranged on a side wall of the lower shell, and multiple output interfaces are arranged on three side surfaces of the lower shell respectively. An anti-skid and shock-absorbing support rubber pad is arranged on the bottom outer wall of the lower shell.

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