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LaserSweeperAn instrument that uses laser scanning to determine whether a surface is balanced, an instrument that projects a visible laser beam and levels the height according to the laser beam. Another concept is an instrument driven by a fast rotating shaft, so that visible laser spots (usually red and green) are swept across the same level of light, making it easy for engineers to locate the level.

The laser is compensated to the horizontal level by the automatic compensation mechanism in the machine, and the laser is emitted. When the rotation compensation range is exceeded, the laser emission is stopped. Hang the inner cylinder base with a suspension wire, install the laser diode in the center, and generally emit the laser vertically. The laser light emitted in the vertical direction is rotated and emitted in the horizontal direction through the objective lens and the pentagonal prism mounted on the motor. Observe whether the warning lamp is within the automatic leveling compensation range and whether the host is tilted. This can be determined by electronically controlling the gap between the inner cylinder block and the outer cylinder block.

The receiver consists of two receiving diodes and a display. The former receives the laser and the latter displays the spot position. At the same time, the position of the light spot is adjusted by the buzzer through the sound color change.The receiver is an upper and lower photodiode, which indicates the position according to the light difference between the two diodes. The photodiode 2 does not light up the laser, which is indicated by the downward arrow symbol. B The photodiodes 1 and 2 are exposed to the same amount of light, indicated by the center mark.

At present, according to the working principle, whether to increase the compensation mechanism and whether to use the compensation mechanism, China's commonly used laserSweeperCan be roughly divided into three categories: bubble laser leveling instrument, automatic leveling laserSweeperAnd electronic automatic leveling sweeper.

The suspension line opto-mechanical compensator is used to achieve automatic leveling in the range. No matter how tilted the instrument is, the scanned laser plane will always remain in the horizontal plane within the compensation range. This instrument is suitable for large vibration of the construction site.

The utility model has a relatively simple structure, low cost and a certain degree of vibration resistance. However, since the compensation accuracy decreases as the compensation range increases, the general compensation range is limited to 10 minutes or more. The modern development of electronic automatic leveling principle can expand the leveling range to about, with high stability and compensation accuracy.

Electronic automatic leveling system is generally composed of sensors, electronic circuits and actuators. BubbleSweeperThe subject element of is similar to the ordinary bubble level in a glass bubble filled with a conductive liquid. The glass tube is coated with a metal cover to form two symmetrical electrodes. There are two resistors between the two electrodes. When the bubble is in the middle, the resistance is equal. When the bubble is tilted, the bubble is displaced, destroying the equilibrium state of the two resistors, causing the bridge composed of the sensor circuit to lose balance, and producing a corresponding voltage output. Electronic processing and amplification of the output signal, drive the actuator, so that the servo motor to produce the corresponding forward rotation or reverse rotation, in order to maintain the balance of the bridge, that is, to achieve the purpose of electronic automatic leveling. In addition to the resistive mode, the sensor also has a capacitive or inductive sensing element.