阅读说明：本技术 超声波风机法兰螺栓轴力监测系统 (Ultrasonic wave fan flange bolt axial force monitoring system ) 是由 王玉辉 刘展 庞宇 罗治军 于 2019-11-28 设计创作，主要内容包括：本发明属于风电机组安全监测技术领域,涉及一种安装便捷式的超声波风机法兰螺栓轴力监测系统。本系统主要包括探头组、系统控制机箱、计算机信息处理软件系统。本系统所用超声探头通过螺栓紧固的方式紧固于探头连接件上,探头连接件通过螺母紧固于风机法兰螺栓上。本系统控制机箱包括多通道超声波发射电路、多通道超声波接收和放大滤波电路、信号传输电路、网线接口、电源接口等；本系统中计算机信息处理软件系统包括各通道采集模块的开关控制模块、接收及显示模块、轴力计算模块、法兰面各监测螺栓分布模块、报警模块等。本发明结构简单、拆装方便,可实现对整个法兰中各螺栓轴力的实时监测。(The invention belongs to the technical field of safety monitoring of wind turbine generators and relates to an ultrasonic fan flange bolt axial force monitoring system convenient to install. The system mainly comprises a probe group, a system control case and a computer information processing software system. The ultrasonic probe used in the system is fastened on the probe connecting piece in a bolt fastening mode, and the probe connecting piece is fastened on a fan flange bolt through a nut. The system control cabinet comprises a multi-channel ultrasonic transmitting circuit, a multi-channel ultrasonic receiving and amplifying filter circuit, a signal transmission circuit, a network cable interface, a power interface and the like; the computer information processing software system in the system comprises a switch control module, a receiving and displaying module, an axial force calculating module, a flange surface monitoring bolt distribution module, an alarm module and the like of each channel acquisition module. The invention has simple structure and convenient assembly and disassembly, and can realize real-time monitoring of the axial force of each bolt in the whole flange.)

1. The ultrasonic fan flange bolt axial force monitoring system is characterized by mainly comprising a probe group, a system control cabinet and a computer information processing software system.

The shell of the ultrasonic probe used by the probe group is a hard material shell with external threads, and the external threads of the hard material shell are provided with two thin nuts which are fastened on the probe connecting piece;

the ultrasonic probe connecting piece is a connecting piece which is formed by a hard material and is provided with a hole in the center, and two ends of the end head of the connecting piece are provided with straight holes for fastening by bolts; the connecting piece is tightly connected with a screw matching nut of a bolt measured by the fan flange by a bolt;

the edge of the matching nut is provided with a threaded hole which is matched with straight holes formed at two ends of the connecting piece; the end of the connecting piece is provided with a straight hole and is connected in a threaded hole of the matching nut through a bolt;

the ultrasonic probe penetrates through a central hole of the connecting piece and is fastened by clamping the connecting piece through two thin nuts on the probe;

the connecting piece is fastened with the matching nut through a threaded hole by a bolt;

a rubber pad is adopted between the contact surfaces of the ultrasonic probe and the tested bolt head as a solid coupling agent;

the matching nut is matched with the tested bolt and screw and is screwed tightly;

in the fan bolt axial force monitoring system, the installation convenience of the ultrasonic probe is a very important factor for smoothly implementing the whole system, the design of the scheme skillfully utilizes the inherent characteristic that the end of the fan flange bolt is provided with threads, the mechanical fastening is realized, and the great convenience is brought to the installation of the ultrasonic probe.

2. The system for monitoring the axial force of the flange bolt of the ultrasonic fan according to claim 1, wherein the system control cabinet comprises a multi-channel ultrasonic transmitting circuit, a multi-channel ultrasonic receiving and amplifying filter circuit, a signal transmission circuit, a network cable interface, a power supply interface and the like;

the multi-channel ultrasonic transmitting circuit in the system control cabinet can simultaneously excite multi-channel ultrasonic pulses and transmit the multi-channel ultrasonic pulses to the ultrasonic probes of different channels;

the multi-channel ultrasonic receiving and amplifying filter circuit in the system control cabinet can simultaneously receive echoes of multi-channel ultrasonic pulses in the bolts, amplify the echoes and further transmit signals to a computer through a network transmission medium.

3. The system for monitoring the axial force of the flange bolts of the ultrasonic fan according to claim 1, wherein the computer information processing software system comprises a switch control module, a receiving and displaying module, an axial force calculating and monitoring module, an axial force distribution module of each monitoring bolt of the whole flange, an alarm module and the like of each channel acquisition module.

The switch control module of each channel acquisition module in the computer information processing software system can control the switch of each ultrasonic probe in the flange, when the switch control module is switched on, the probe transmits and receives ultrasonic waves, and when the switch control module is switched off, the transmission is interrupted;

the receiving and displaying module of each channel acquisition module in the computer information processing software system can display the oscillogram of the current ultrasonic probe in real time after the switch is turned on;

each channel axial force calculation monitoring module in the computer information processing software system can calculate the axial force of the bolt on the basis of the receiving and display module and display the axial force on the module in real time;

the bolt axial force distribution monitoring modules of the whole flange in the computer information processing software system can display the serial numbers of the probes in the whole flange and the positions of the probes in the flange in a display area, and simultaneously display real-time bolt axial force values corresponding to the probes.

And each channel alarm module in the computer information processing software system can compare the bolt axial force in real time on the basis of the axial force calculation monitoring module, automatically alarm when the bolt axial force exceeds a fixed threshold value, and display the alarm on the module.

Technical Field

The invention belongs to the technical field of safety monitoring of wind turbine generators and designs an ultrasonic fan flange bolt axial force monitoring system convenient to install based on the principle of acoustic elasticity.

Background

Wind power generation is a mature renewable energy technology and is more and more valued by countries in the world. Bolts are used as fasteners for connecting a tower barrel, blades, a hub, a cabin and the like of the wind driven generator. Therefore, whether the bolts are loosened or not can greatly affect the stability of the whole fan system, and a serious person can cause the damage of the whole fan. The axial force of the bolt can directly reflect the stress state of the bolt, and particularly can directly reflect whether the bolt is loosened or broken. Therefore, the fault diagnosis and the online monitoring of the axial force of the fan flange bolt are necessary.

The ultrasonic measurement technology based on the acoustic elasticity principle is widely applied to the axial force measurement of the bolt, and both experiments and practical application are mature. Therefore, the scheme can play a great application value in axial force measurement of the fan flange connecting bolt.

The on-line monitoring system for the axial force of the fan bolt integrates advanced technologies such as computer and control, signal processing and analysis, Internet of things and big data into a whole. The fan bolt real-time stress condition judgment system can transmit the sensing signals of the fan bolt collected in real time to the remote data analysis center, analyzes the sensing signals, judges the real-time stress condition of the fan bolt, and judges the safety fault according to the stress condition. In addition, the blade load of the fan, the fatigue of the bolts and the like can be further judged according to the data analysis of the real-time stress analysis of the bolts. The bolt can be monitored in the whole life cycle, and the stress mechanism and the damage mechanism of the bolt can be deeply known.

In current fan bolt ultrasonic monitoring system, there is following problem mainly: smearing liquid coupling agent; the connection of the probe and the bolt to be tested is inconvenient. The invention provides a mechanical connection method, which is characterized in that a probe and a tested bolt are connected in a mechanical connection mode, and the installation and the disassembly are both convenient. In addition, the thin rubber pad is clamped between the probe and the tested bolt to be used as the solid couplant, so that the tedious work of frequently coating the liquid couplant is omitted. In conclusion, the method provided by the invention can well solve the main problems.

Disclosure of Invention

The invention provides an ultrasonic fan flange bolt axial force monitoring system convenient to install based on the acoustoelastic principle. The system is mainly used for solving the problems that the general monitoring system can not monitor the axial force of the bolt in real time, can not conveniently install an ultrasonic probe, and the liquid coupling agent between the ultrasonic probe and the contact surface of the bolt is inconvenient to use, and has the problems of transmitting and receiving and filtering circuit design, multi-channel signal transmission and processing, computer processing software system and the like.

The technical scheme adopted by the invention is as follows:

the system mainly comprises a probe group, a system control cabinet and a computer information processing software system.

The shell of the ultrasonic probe (used in the probe group) is a shell with external threads, and the external threads of the shell are provided with two thin nuts which are fastened on the probe connecting piece;

the ultrasonic probe connecting piece is a connecting piece with a hole in the center, which is formed by bending a metal sheet or forming a plastic die, and two ends of the end of the connecting piece are provided with straight holes for fastening by bolts; the connecting piece is tightly connected with the screw matching nut of the tested bolt by a bolt;

the edge of the matching nut is provided with a threaded hole which is matched with straight holes formed at two ends of the connecting piece; the end of the connecting piece is provided with a straight hole and is connected in a threaded hole of the matching nut through a bolt;

the ultrasonic probe penetrates through a central hole of the connecting piece and is fastened by clamping the connecting piece through two thin nuts on the probe;

the connecting piece is fastened with the matching nut through a threaded hole by a bolt;

a rubber pad is adopted between the contact surfaces of the ultrasonic probe and the tested bolt head as a solid coupling agent;

the matching nut is matched with the tested bolt and screw and is screwed tightly;

in the fan bolt axial force monitoring system, the installation convenience of the ultrasonic probe is a very important factor for smoothly implementing the whole system, the design of the scheme skillfully utilizes the inherent characteristic that the end of the fan flange bolt is provided with threads, the mechanical fastening is realized, and the great convenience is brought to the installation of the ultrasonic probe.

The convenient and fast installation type ultrasonic fan flange bolt axial force monitoring system based on the acoustoelastic principle comprises a control cabinet of the system, a power supply and a control system, wherein the control cabinet of the system comprises a multi-channel ultrasonic transmitting circuit, a multi-channel ultrasonic receiving and amplifying filter circuit, a signal transmission circuit, a network cable interface, a power supply interface and the like;

the multi-channel ultrasonic transmitting circuit in the system control cabinet can simultaneously excite multi-channel ultrasonic pulses and transmit the multi-channel ultrasonic pulses to the ultrasonic probes of different channels;

the multi-channel ultrasonic receiving and amplifying filter circuit in the system control cabinet can simultaneously receive echoes of multi-channel ultrasonic pulses in the bolts, amplify the echoes and further transmit signals to a computer through a network transmission medium.

The convenient and fast installation type ultrasonic fan flange bolt axial force monitoring system based on the acoustoelastic principle comprises a switch control module, a receiving and displaying module, an axial force calculating and monitoring module, a whole flange bolt axial force distribution monitoring module, an alarm module and the like of each channel acquisition module.

The switch control module of each channel acquisition module in the computer information processing software system can control the switch of each ultrasonic probe in the flange, when the switch control module is switched on, the probe transmits and receives ultrasonic waves, and when the switch control module is switched off, the transmission is interrupted;

the receiving and displaying module of each channel acquisition module in the computer information processing software system can display the oscillogram of the current ultrasonic probe in real time after the switch is turned on;

each channel axial force calculation monitoring module in the computer information processing software system can calculate the axial force of the bolt on the basis of the receiving and display module and display the axial force on the module in real time;

the bolt axial force distribution monitoring modules of the whole flange in the computer information processing software system can display the serial numbers of the probes in the whole flange and the positions of the probes in the flange in a display area, and simultaneously display real-time bolt axial force values corresponding to the probes.

And each channel alarm module in the computer information processing software system can compare the bolt axial force in real time on the basis of the axial force calculation monitoring module, automatically alarm when the bolt axial force exceeds a fixed threshold value, and display the alarm on the module.

The invention has the beneficial effects that:

(1) the structure is simple, and the cost is low;

(2) the axial force of the flange bolt can be monitored in real time;

(3) the ultrasonic probe can be conveniently installed;

(4) a solid coupling agent is adopted between the contact surfaces of the ultrasonic probe and the bolt, so that the problem that the use of coupling agents such as liquid and the like is extremely inconvenient is solved;

(5) the design of the transmitting, receiving and filtering circuit can directly realize a multi-path and multi-channel acquisition module on the circuit;

(6) real-time monitoring software modules for signal acquisition, axial force analysis and the like are realized in a computer processing software system.

Drawings

FIG. 1 is a schematic view of the overall structure of the present invention;

FIG. 2 is a schematic view of a probe connection line and a connection structure of a system control cabinet;

FIG. 3 is a schematic view of a connection structure of an ultrasonic probe and a bolt;

FIG. 4 is a schematic structural diagram of an ultrasonic probe;

FIG. 5 is a schematic view of the structure of the ultrasonic probe connector;

fig. 6 is a schematic view of an ultrasonic probe mating nut.

Numbering in the figures:

1-system control cabinet, 2-probe and cabinet connecting line, 3-probe and cabinet connecting line plug, 4-system control cabinet power plug, 5-network cable, 6-ultrasonic probe, 7-probe external thread fixing nut, 8-probe fixing connector, 9-rubber pad (solid coupling agent), 10-connector fixing screw, 11-connector fixing nut (flange bolt matching nut), 12-system control cabinet probe line jack and 13-network cable plug.

Detailed Description

The invention provides an ultrasonic fan flange bolt axial force monitoring system convenient and fast to install based on the acoustoelastic principle, and the structural principle and the working principle of the ultrasonic fan flange bolt axial force monitoring system are further explained by combining the accompanying drawings.

As shown in fig. 1, the system mainly includes an ultrasonic probe group, an ultrasonic probe connecting line, a system control cabinet, and a computer information processing software system.

As shown in fig. 2, an ultrasonic probe 6 is fixed on a fan flange bolt, the probe 6 is connected with a probe line interface 12 of a system control cabinet 1 through a probe line 2, an ultrasonic pulse transmitting and receiving and filtering circuit is arranged in the system control cabinet 1, the pulse transmitting circuit can transmit pulses to the ultrasonic probe, the receiving circuit can receive ultrasonic reflection echoes, the filtering circuit amplifies received signals, the received signals are transmitted to computer information processing software through a network cable 5, and the computer information processing software processes the signals so as to calculate the bolt axial force condition corresponding to each probe.

As shown in fig. 3, the connection and fastening diagram of the ultrasonic probe 6 and the flange bolt is shown, the shell of the ultrasonic probe 6 is a metal shell with external threads, the external threads of the metal shell are provided with two thin nuts 7 which are fastened on the probe connecting piece 8, the probe connecting piece 8 is fastened and connected with a screw matching nut 11 of the bolt measured by the fan flange through a bolt 10, and the matching nut is screwed on the head of the screw of the bolt measured. The ultrasonic probe 6 passes through the central hole of the probe connecting piece 8, and the ultrasonic probe 6 and the probe connecting piece 8 are fastened through two thin nuts 7 on the probe. A rubber pad 9 is adopted as a solid coupling agent between the contact surface of the ultrasonic probe 6 and the bolt head to be measured, and the end face of the ultrasonic probe 6 is tightly pressed on the rubber pad 9 to the end head of the bolt to be measured by screwing a matching nut 11.

The system control case is connected with a power supply, a switch is turned on, and after the computer information processing software system is turned on, the bolt axial force condition corresponding to each channel can be monitored in real time.

The working process of the system is as follows:

firstly, fastening a matching nut and a probe connecting piece by using a bolt, fastening an ultrasonic probe on the probe connecting piece, integrally screwing the probe and the matching nut at a screw of a measured bolt head, placing a rubber pad (solid coupling agent) between the top end of the probe and the measured bolt head in the screwing process, and compressing the rubber pad (solid coupling agent) by the top end of the probe and the measured bolt head along with the increase of the screwing amount of the matching nut.

One end of the probe line is connected to the ultrasonic probe, and the other end of the probe line is connected to the probe connecting jack of the system control cabinet. The system control computer box network cable port is inserted into one end of the transmission network cable, and the other end of the transmission network cable is connected with the computer host. The power plug of the system control cabinet is plugged, the power supply of the computer host is connected, the computer is turned on, and the computer information processing software is turned on. The real-time axial force monitoring condition of the bolts corresponding to the probes of each channel can be displayed in real time.