| 摘要 |
The automatic control device of geotechnical machine for measuring load-bearing capacity of the soil according to the present invention consists of at least one deviation meter installed on a geotechnical machine (1), an actuator (1.3) installed also on the geotechnical machine (1), a software (3.1) installed on a computer (3), and a bidirectional USB communicator (2). The digital deviation meter is provided with a port, the USB communicator (2) is provided with at least one serial port (2.1, 2.2) connected to deviation meters (1.1, 1.2) provided with a serial ports, and at least one digital deviation meter is performed as a first digital deviation meter for measuring dynamometer deformation and/or a second digital deviation meter for measuring position of a piston/penetration. The USB communicator (2) is intended for transmission of information from the deviation meters (1.1, 1.2) into the computer (3) and for transmission of control commands to the geotechnical machine (1). The connection of the deviation meter (1.1, 1.2) and the USB communicator (2) is implemented through the mediation of a serial cable (4), the connection of the actuator (1.3) with the USB communicator (2) is made through the mediation of a multi-core cable (5) and connection of the USB communicator (2) to the computer (3) is made by means of an USB cable (6). The measurement of load-bearing capacity on the geotechnical machine for measuring load-bearing capacity of the soil with automatic control device is conducted such that a piston of the geotechnical machine (1) moves in the direction to the material to be tested until the instant of its contact therewith, which is identified by the change in deformation being measured by the first digital deviation meter (1.1) for measuring dynamometer deformation and subsequent the piston moves toward the tested material until the instant of achieving a preset penetration, where the actual penetration is measured by the second digital deviation meter (1.2), or until stabilized stress is achieved. Subsequently, the direction of the piston movement changes and the piston returns back in its initial position with zero stress acting on the material under test. Then the piston stops automatically or the cycle repeats. The complete release of stress acting on the material is identified by the achievement of zero value of the first digital deviation meter (1.1) for measuring dynamometer deformation. At the moment of the first contact of the piston with the material under test, all the deviation meters reset to zero and the dynamometer deformation value, being measured by the first digital deviation meter (1.1), is read out regularly during the movement of the piston for various penetration values wherein the measured values are continuously recorded in an output file. |
