The purpose of the invention is to provide a convenient data acquisition device for measuring the displacement and displacement of the steel cable bridge in the process of data acquisition and data acquisition work efficiency. Beneficial effect:
The purpose of the invention is to provide a bridge jacking digital video monitoring device. In the process of dragging the bridge by steel cable, the data required in the project can be obtained quickly and conveniently by measuring the bridge offset distance and moving distance, and the displacement signal acquisition, signal conditioning, signal conversion, computer acquisition and recording of displacement data can be completed, and the work is greatly improved work efficiency.
1. The invention adopts a pulling rope Displacement sensor The deviation angle of the whole bridge and the moving distance of the bridge are measured. Then the signal acquisition box and data analysis computer are used to complete the displacement signal acquisition, signal conditioning, signal conversion, computer acquisition and recording of displacement data. Through the measurement of these physical quantities, the data needed in the project can be obtained quickly and conveniently, and the work efficiency is greatly improved. Precision pulling rope Displacement sensor The mechanical displacement can be converted into a measurable, linear proportional electrical signal. When the measured object has a displacement, it will pull the stretching rope connected with it, and the stretching rope will drive the sensor transmission mechanism and sensing element to rotate synchronously; when the displacement moves in the reverse direction, the rotary device inside the sensor will automatically retract the rope, and keep its tension unchanged during the rope extension and retraction process, so as to output an electrical signal which is positively proportional to the rope movement. It also includes signal acquisition, signal processing, signal processing, signal processing and so on. It is an interactive acquisition unit, with acquisition frequency up to 10kHz, wide range of 0.0001-45.000, adjustable counting ratio, display range: - 19999-45000; it can control clearing, plus / minus counting; it can provide double counting mode, and transmit output can take the measured and transformed display value as standard current; The fully transparent, high-speed and efficient network communication interface realizes the complete data transmission and control between the computer and the acquisition unit. The embedded combination design of single chip microcomputer has strong hardware expansibility, which can expand input, timing, program sequence control, etc., which is not limited to standard functions. It can be combined according to the actual needs to achieve the best performance.
2. Since the invention is used in the engineering site, the site environment is complex and the electric equipment is diversified. The equipment uses the power for construction on site. The UPS equipment is adopted in the invention to avoid the instantaneous power failure of the equipment and the impact of power supply on the equipment.
Description of drawings:
Fig. 1 is a structural diagram of the invention.
Fig. 2 is the installation structure diagram of the sensor of the invention.
Fig. 3 is the circuit connection diagram of the invention.
Specific implementation mode:
The bridge jacking digital video monitoring device consists of: signal acquisition box 1, the signal acquisition box is connected with a group of sensors 4, the signal acquisition box is respectively connected with a voltage stabilizing power supply 2 and a data analysis computer 3, and the group of sensors includes a main ranging large range rope displacement sensor and four medium range pull rope displacement sensors. As shown in Fig. 2, two displacement sensors are respectively installed on both sides of the bridge (the sensors are connected by the center of the roller which is in close contact with the side of the bridge. When the bridge moves, the roller rotates. When the bridge deviates, the sensor measures the vertical displacement of the contact point of the roller, and the deviation angle of one side can be obtained through the geometric conversion relationship on one side. At the same time, the other side of the conversion can also be obtained, both sides jointly confirm the deviation angle. The deviation angle of the whole bridge is obtained. A large range ranging sensor is installed on the end face of the bridge to measure the moving distance of the bridge.
For the bridge jacking digital video monitoring device, the signal acquisition box includes a signal input module 7, the signal input module is connected with the signal processing and display unit 5, the signal processing and display unit is connected with the communication conversion unit 6, and the communication conversion unit is connected with the data analysis computer through the RS232 interface.
The main chip model of the signal processing and display unit of the bridge jacking digital video monitoring device is STC 89c53rc 401-plcc.