Hump humping vehicle weight measuring method and device based on strain type weighing sensor

Abstract

The invention discloses a hump humping vehicle weight measuring method and device based on a strain type weighing sensor, and the method and the device are corresponding schemes, in the scheme, the strain type weighing sensor is used for replacing a plug pin type piezomagnetic weighing sensor, and a signal isolation and acquisition circuit is used for rapidly reading the voltage of the sensor; on one hand, the measurement precision of the weighing equipment can be improved by utilizing the strong calculation and storage capability of the data processing device, and on the other hand, the weight information is obtained through waveform analysis, and a large amount of waveform data is stored in a quite long time. And a reliable basis is provided for equipment maintenance. Meanwhile, weight waveform analysis can be carried out according to the collected data, data abnormity alarm and equipment maintenance guidance are achieved, and the problem that existing maintenance difficulty is large is better solved.

Description

Technical Field

[0001] The invention relates to the technical field of hump-sliding vehicle weight measurement, and in particular to a hump-sliding vehicle weight measurement method and equipment based on a strain gauge weighing sensor. Background Art

[0002] The weight measuring device is one of the important basic parameters of the railway marshalling yard automation control system. It is an indispensable basis for the control system to control the action of the reducer; in the point-connected speed control system of the reducer + retarder, the deceleration effect of the retarder on the vehicle is directly related to the vehicle weight. In some cases, the weight of the vehicle is also an important parameter for determining the running resistance of the vehicle. Therefore, the weight measuring device is one of the basic equipment of the marshalling yard automation system and is a measuring device for measuring the weight level of the shunting vehicle.

[0003] At present, the weighing technology of camel humps at home and abroad calculates the wheel weight by measuring the shear stress generated by the wheel weight on the rail. There are many types of sensors used for weighing, mainly electric strain and electromagnetic strain. The widely used pin-type piezomagnetic weighing equipment in China includes pin-type piezomagnetic weighing sensor, excitation power supply and weight signal processing circuit, and the weight signal processing adopts analog circuit. The daily monitoring and maintenance of weighing equipment requires professionals to observe the weighing waveform by connecting an oscilloscope, and manually adjust the zero adjustment, zero crossing and weight physical knobs on the weighing machine panel. Since the vehicle passes through the sensor for a short time, the waveform exists for a short time. At the same time, the oscilloscope cannot store a large number of waveforms for a long time, and the maintenance is difficult.

[0004] Specifically: At present, the monitoring of the plug-in type piezomagnetic weighing equipment is mainly observed by an oscilloscope. The waveform of the weight signal is observed by an oscilloscope. According to the waveform, the roadbed where the outdoor weighing sensor is located is tamped to make the positive and negative half-cycle waveforms more balanced. When the axle of the measured vehicle passes over the weighing sensor, the sensor outputs an AC voltage signal proportional to the axle weight, which directly enters the room through the outdoor cable. The weighing signal is converted into a DC signal through AC amplification and phase-sensitive rectification. Since the phase difference of the measured AC signals of the two sections is 180° when the wheel passes through the front and rear sections of the rail where the sensor is located, after phase-sensitive rectification, the wheel weight of each wheel can obtain positive and negative half-wave DC voltages. This signal passes through the voltage peak acquisition circuit to obtain the analog voltage of the wheel weight. The wheel weight analog voltage is converted into a digital quantity through the A / D conversion circuit. This digital quantity is sent to the computer to calculate the vehicle weight. When the wheel passes through the piezomagnetic weighing sensor, the circuit automatically sends an interrupt signal to the computer to read the weight. The weight of each wheel of the vehicle is displayed on the panel display of the weighing machine. However, the anti-interference ability of the pin-type piezomagnetic weighing sensor is relatively poor, and the accuracy is poor, and zero drift often occurs; when replacing the sensor, drilling work is required, and the construction is complicated and difficult, which greatly interferes with the accuracy of the equipment. In addition, the existing weighing equipment can only observe the waveform of the weight signal, but cannot analyze the waveform and generate alarm information to guide the maintenance of the weighing equipment, and it cannot save the waveform information for a long time, which is not convenient for maintenance personnel to observe the recent changes in the working conditions of the weighing equipment.

[0005] In view of this, the present invention is proposed. Summary of the invention

[0006] The purpose of the present invention is to provide a method and device for measuring the weight of a humpback vehicle based on a strain gauge weighing sensor, which can improve measurement accuracy, reduce the risk of inaccurate data and reduce the difficulty of calibration. At the same time, it can also automatically determine the working condition of the equipment, thereby reducing manual maintenance costs.

[0007] The objective of the present invention is achieved through the following technical solutions:

[0008] A humpback vehicle weighing device based on a strain gauge weighing sensor comprises: an excitation circuit, a strain gauge weighing sensor, a signal isolation and acquisition circuit and a data processing device; wherein:

[0009] The excitation circuit generates an excitation power supply signal and transmits it to the strain gauge weighing sensor, and transmits it to the data processing device via the signal isolation and acquisition circuit;

[0010] The strain gauge load cell enters a working state after receiving an excitation power supply signal. When a hump-release vehicle passes by, causing the external pressure felt by the strain gauge load cell to change, an amplitude analog voltage signal containing pressure change information is output;

[0011] The signal isolation and acquisition circuit acquires the excitation power supply signal, and transmits it to the data processing device after conversion, and acquires the amplitude analog voltage signal containing the pressure change information, and transmits it to the data processing device after isolation and conversion;

[0012] The data processing device uses the two received converted signals to obtain a weight measurement waveform, and implements hump-release vehicle weight measurement and equipment operating condition judgment based on the weight measurement waveform.

[0013] A method for measuring the weight of a humpback vehicle based on a strain gauge weighing sensor is implemented based on the aforementioned device, and the method comprises:

[0014] The excitation power supply signal is generated by the excitation circuit and transmitted to the strain type weighing sensor, and is transmitted to the data processing device through the signal isolation and acquisition circuit;

[0015] The strain gauge load cell enters a working state after receiving an excitation power supply signal. When a hump-release vehicle passes by, causing the external pressure felt by the strain gauge load cell to change, an amplitude analog voltage signal containing pressure change information is output;

[0016] The signal isolation and acquisition circuit acquires the excitation power supply signal, and transmits it to the data processing device after conversion, and acquires the amplitude analog voltage signal containing the pressure change information, and transmits it to the data processing device after isolation and conversion;

[0017] The data processing device uses the two converted signals received to obtain a weight measurement waveform, and implements hump-sliding vehicle weight measurement and equipment operating condition judgment based on the weight measurement waveform.

[0018] It can be seen from the technical solution provided by the present invention that the use of strain gauge weighing sensors instead of pin-type piezomagnetic weighing sensors, the use of signal isolation and acquisition circuits can quickly read the sensor voltage, and transmit it to the data processing device for digital processing and analysis to obtain the weight measurement waveform. On the one hand, the powerful computing and storage capabilities of the data processing device can improve the measurement accuracy of the weighing equipment. On the other hand, the weight information can be obtained through waveform analysis and a large amount of waveform data can be stored for a considerable period of time, providing a reliable basis for equipment maintenance. At the same time, weight waveform analysis can be performed based on the collected data to achieve data abnormality alarms and equipment maintenance guidance, which better solves the problem of existing maintenance difficulties. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other accompanying drawings can be obtained based on these accompanying drawings without paying creative work.

[0020] Figure 1 A schematic diagram of a hump-type vehicle weighing device based on a strain gauge weighing sensor provided in an embodiment of the present invention;

[0021] Figure 2 A schematic diagram of the working principle of a humpback vehicle weighing device based on a strain gauge weighing sensor provided in an embodiment of the present invention;

[0022] Figure 3 A data processing flow chart of the hump-free vehicle weight measurement process provided by an embodiment of the present invention. DETAILED DESCRIPTION

[0023] The following is a clear and complete description of the technical solutions in the embodiments of the present invention in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the protection scope of the present invention.

[0024] First, the terms that may be used in this article are explained as follows:

[0025] The terms "include", "comprises", "contains", "has" or other descriptions with similar semantics should be interpreted as non-exclusive inclusion. For example, including certain technical feature elements (such as raw materials, components, ingredients, carriers, dosage forms, materials, dimensions, parts, components, mechanisms, devices, steps, procedures, methods, reaction conditions, processing conditions, parameters, algorithms, signals, data, products or products, etc.) should be interpreted as including not only certain technical feature elements explicitly listed, but also other technical feature elements known in the art that are not explicitly listed.

[0026] The term "consisting of..." means excluding any technical feature elements not explicitly listed. If this term is used in a claim, it will make the claim closed, so that it does not contain technical feature elements other than the technical feature elements explicitly listed, except for the conventional impurities related to them. If this term only appears in a clause of a claim, it only limits the elements explicitly listed in the clause, and the elements recorded in other clauses are not excluded from the overall claim.

[0027] The following is a detailed description of a method and device for measuring the weight of a humpback vehicle based on a strain gauge weighing sensor provided by the present invention. The contents not described in detail in the embodiments of the present invention belong to the prior art known to professionals in the field. If no specific conditions are specified in the embodiments of the present invention, the conventional conditions in the field or the conditions recommended by the manufacturer shall be followed. The instruments used in the embodiments of the present invention, if the manufacturer is not specified, are all conventional products that can be purchased commercially.

[0028] Embodiment 1

[0029] The embodiment of the present invention provides a humpback vehicle weighing device based on a strain gauge weighing sensor, such as Figure 1 As shown, it mainly includes: an excitation circuit, a strain type weighing sensor, a signal isolation and acquisition circuit and a data processing device.

[0030] (1) The excitation circuit generates an excitation power supply signal and transmits it to the strain gauge weighing sensor, and transmits it to the data processing device through the signal isolation and acquisition circuit.

[0031] Preferably, the excitation power supply signal is a DC voltage signal within a set voltage range.

[0032] (2) The strain gauge load cell enters a working state after receiving an excitation power supply signal. When a humpback vehicle passes by, causing the external pressure sensed by the strain gauge load cell to change, the strain gauge load cell outputs an amplitude analog voltage signal containing pressure change information.

[0033] (3) The signal isolation and acquisition circuit acquires the excitation power supply signal, converts it and transmits it to the data processing device, and acquires the amplitude analog voltage signal containing pressure change information, isolates and converts it and transmits it to the data processing device.

[0034] Preferably, the signal acquisition circuit includes: an isolation circuit and an A / D converter (analog / digital converter); the isolation circuit acquires the amplitude analog voltage signal containing pressure change information and isolates and transmits it to the A / D converter; the A / D converter performs analog-to-digital conversion on the output of the isolation circuit and transmits it to the data processing device, and performs analog-to-digital conversion on the excitation power supply signal and transmits it to the data processing device.

[0035] (4) The data processing device uses the two converted signals received to obtain a weight measurement waveform, and implements hump-sliding vehicle weight measurement and equipment operating condition judgment based on the weight measurement waveform.

[0036] Preferably, after the data processing device receives the two conversions, a filtering algorithm is used to obtain the amplitude of the pressure change information, and the amplitude of the pressure change information is used to obtain the weight measurement waveform, thereby realizing the hump release vehicle weight measurement and equipment working condition judgment. The main process includes:

[0037] (4.1) Obtaining a weight measurement waveform according to the amplitude of the pressure change information;

[0038] (4.2) Determine whether the weight measurement waveform is a valid waveform; specifically, the currently obtained weight measurement waveform may be compared and analyzed with the historical weight measurement waveform to determine whether the weight measurement waveform is a valid waveform.

[0039] Those skilled in the art can understand that the weight measurement waveform is a pulse waveform. Therefore, during comparison and analysis, the validity can be determined by the amplitude and time (pulse width).

[0040] (4.3) If it is a valid waveform, the weighing waveform is stored and converted into weight information, and then compared with the weight signal information of the external weighing device; if the comparison result shows that the weight information is normal data, the weight information is stored as the weighing result of the humpback vehicle; if the comparison result shows that the weight information is abnormal data, an alarm is issued.

[0041] In an embodiment of the present invention, the weight information of a given weighing device is the load information obtained by accessing other devices. If the difference between the weight information and the load information is too large (i.e., exceeds the set threshold), an alarm needs to be issued; if it does not exceed the threshold, it indicates that the weight information is normal data and can be stored normally.

[0042] Preferably, the humpback vehicle weighing device further comprises: a display for receiving and displaying the weighing waveform transmitted by the data processing device.

[0043] In order to more clearly demonstrate the technical solution and technical effects provided by the present invention, the device provided by the embodiment of the present invention is described in detail with reference to a specific embodiment below.

[0044] like Figure 2 The figure shows the working principle of the device. The device uses a high-speed sampling method to process the output signal of the hump weighing sensor, and can accurately measure the linear relationship between the external pressure of the rail and the output voltage of the weighing sensor signal. It can be applied to the weight measurement and equipment maintenance of the hump weighing equipment. Figure 2 In the schematic diagram shown, the processing computer serves as the data processing device, the standard excitation source serves as the excitation circuit, and the data acquisition card serves as the A / D converter.

[0045] The standard excitation source outputs the excitation power supply signal to the strain gauge load cell. The normal excitation voltage is 8-24V DC. At the same time, the excitation power supply signal is converted by the A / D converter (data acquisition card) and transmitted to the processing computer. When the external pressure on the strain gauge load cell changes, it outputs an amplitude analog voltage signal containing pressure change information. This signal is converted by the isolation circuit and the A / D converter and transmitted to the processing computer.

[0046] When the two converted signals are transmitted to the processing computer at the same time, a filtering algorithm is used to complete the calculation of the amplitude of the sensor output signal. The filtering algorithm can filter out noise and improve the output signal-to-noise ratio. According to the real-time amplitude of the voltage signal, the weight measurement waveform is obtained and displayed in real time through the display interface (UI interface in the display); the above process is periodic, so the data of each sampling cycle can be used for comparison and analysis to determine whether the current weight measurement waveform is a valid weight measurement waveform; if so, the weight measurement waveform is stored and converted into weight information, and then compared and stored with the weight signal of the weighing equipment. If the comparison result of the waveform and weight information shows that the converted weight information is abnormal, an alarm message is issued to guide maintenance personnel to adjust the parameters of the weighing equipment. Figure 3 As shown, the data processing flow during the humpback vehicle weight measurement process is demonstrated.

[0047] The above-mentioned scheme provided by the embodiment of the present invention uses a strain gauge weighing sensor to replace a pin-type piezomagnetic weighing sensor, and uses a signal isolation and acquisition circuit to quickly read the sensor voltage and transmit it to a data processing device for digital processing and analysis to obtain a weight measurement waveform. On the one hand, the powerful computing and storage capabilities of the data processing device can be used to improve the measurement accuracy of the weighing equipment. On the other hand, weight information can be obtained through waveform analysis and a large amount of waveform data can be stored for a considerable period of time, providing a reliable basis for equipment maintenance. At the same time, weight waveform analysis can be performed based on the collected data to achieve data abnormality alarms and equipment maintenance guidance, which better solves the problem of existing maintenance difficulties.

[0048] Through the description of the above implementation methods, those skilled in the art can clearly understand that the data processing flow involved in the above embodiments can be implemented by software, or by means of software plus necessary general hardware platforms. Based on such an understanding, the technical solutions of the above embodiments can be embodied in the form of software products, which can be stored in a non-volatile storage medium (which can be a CD-ROM, a USB flash drive, a mobile hard disk, etc.), including several instructions for enabling a computer device (which can be a personal computer, a server, or a network device, etc.) to execute the methods described in the various embodiments of the present invention.

[0049] Embodiment 2

[0050] The embodiment of the present invention provides a method for measuring the weight of a humpback vehicle based on a strain gauge load cell. The method is mainly implemented based on the device provided in the above embodiment. The method includes:

[0051] The excitation power supply signal is generated by the excitation circuit and transmitted to the strain type weighing sensor, and is transmitted to the data processing device through the signal isolation and acquisition circuit;

[0052] The strain gauge load cell enters a working state after receiving an excitation power supply signal. When a hump-release vehicle passes by, causing the external pressure felt by the strain gauge load cell to change, an amplitude analog voltage signal containing pressure change information is output;

[0053] The signal isolation and acquisition circuit acquires the excitation power supply signal, and transmits it to the data processing device after conversion, and acquires the amplitude analog voltage signal containing the pressure change information, and transmits it to the data processing device after isolation and conversion;

[0054] The data processing device uses the two converted signals received to obtain a weight measurement waveform, and implements hump-sliding vehicle weight measurement and equipment operating condition judgment based on the weight measurement waveform.

[0055] Considering that the principle of the device has been introduced in detail in the above embodiments, it will not be described in detail.

[0056] The above is only a preferred specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions that can be easily thought of by any technician familiar with the technical field within the technical scope disclosed in the present invention should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention should be based on the protection scope of the claims. The information disclosed in the background technology section of this article is only intended to deepen the understanding of the overall background technology of the present invention, and should not be regarded as an admission or in any form that the information constitutes prior art known to those skilled in the art.

Claims

1. A humpback vehicle weighing device based on a strain gauge weighing sensor, characterized in that: include: Excitation circuit, strain gauge weighing sensor, signal isolation and acquisition circuit and data processing device; wherein: The excitation circuit generates an excitation power supply signal and transmits it to the strain gauge weighing sensor, and transmits it to the data processing device via the signal isolation and acquisition circuit; The strain gauge load cell enters a working state after receiving an excitation power supply signal. When a hump-release vehicle passes by, causing the external pressure felt by the strain gauge load cell to change, an amplitude analog voltage signal containing pressure change information is output; The signal isolation and acquisition circuit acquires the excitation power supply signal, and transmits it to the data processing device after conversion, and acquires the amplitude analog voltage signal containing the pressure change information, and transmits it to the data processing device after isolation and conversion; The data processing device uses the two received converted signals to obtain a weight measurement waveform, and implements hump-release vehicle weight measurement and equipment operating condition judgment based on the weight measurement waveform.

2. The humpback vehicle weighing device based on a strain gauge weighing sensor according to claim 1 is characterized in that: The excitation power supply signal is a DC voltage signal within a set voltage range.

3. The humpback vehicle weighing device based on a strain gauge weighing sensor according to claim 1, characterized in that: The signal acquisition circuit includes: an isolation circuit and an A / D converter; The isolation circuit collects the amplitude analog voltage signal containing the pressure change information and transmits it to the A / D converter through isolation; The A / D converter performs analog-to-digital conversion on the output of the isolation circuit and transmits the result to the data processing device, and also performs analog-to-digital conversion on the excitation power supply signal and transmits the result to the data processing device.

4. The humpback vehicle weighing device based on a strain gauge weighing sensor according to claim 1, characterized in that: The method of obtaining a weight measurement waveform by using the two converted signals received, and realizing the weight measurement of the hump-release vehicle and the equipment working condition judgment based on the weight measurement waveform includes: After receiving the two conversions, a filtering algorithm is used to obtain the amplitude of the pressure change information, and the amplitude of the pressure change information is used to obtain the weight measurement waveform, thereby realizing the hump-release vehicle weight measurement and equipment working condition judgment.

5. The humpback vehicle weighing device based on a strain gauge weighing sensor according to claim 4 is characterized in that: The method of obtaining a weight measurement waveform by using the amplitude of the pressure change information, and realizing the weight measurement of the hump-release vehicle and the equipment working condition judgment based on the waveform, includes: According to the amplitude of the pressure change information, a weight measurement waveform is obtained; Determine whether the weight measurement waveform is a valid waveform; If it is a valid waveform, the weighing waveform is stored and converted into weight information, and then compared with the weight signal information of the external input weighing device; if the comparison result shows that the weight information is normal data, the weight information is stored as the humpback vehicle weighing result; if the comparison result shows that the weight information is abnormal data, an alarm is issued.

6. The humpback vehicle weighing device based on a strain gauge weighing sensor according to claim 5, characterized in that: The step of determining whether the weight measurement waveform is a valid waveform comprises: The currently acquired weight measurement waveform is compared and analyzed with the historical weight measurement waveform to determine whether the weight measurement waveform is a valid waveform.

7. The humpback vehicle weighing device based on a strain gauge weighing sensor according to claim 5, characterized in that: The humpback vehicle weighing device further comprises: a display for receiving and displaying the weighing waveform transmitted by the data processing device.

8. A method for measuring the weight of a humpback vehicle based on a strain gauge weighing sensor, characterized in that: Based on the device implementation according to any one of claims 1 to 7, the method comprises: The excitation power supply signal is generated by the excitation circuit and transmitted to the strain type weighing sensor, and is transmitted to the data processing device through the signal isolation and acquisition circuit; The strain gauge load cell enters a working state after receiving an excitation power supply signal. When a hump-release vehicle passes by, causing the external pressure felt by the strain gauge load cell to change, an amplitude analog voltage signal containing pressure change information is output; The signal isolation and acquisition circuit acquires the excitation power supply signal, and transmits it to the data processing device after conversion, and acquires the amplitude analog voltage signal containing the pressure change information, and transmits it to the data processing device after isolation and conversion; The data processing device uses the two converted signals received to obtain a weight measurement waveform, and implements hump-sliding vehicle weight measurement and equipment operating condition judgment based on the weight measurement waveform.

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