The method of sending messages in underground excavations
The invention relates to communication systems in which the transmission medium is the earth, and in particular to methods of signaling used in mines or tunnels. The purpose of the invention is to enhance reliability of operational and emergency communications with personnel in the mines. The invention consists in that the signal on the earth's surface form a low frequency, and in underground mine workings, it is converted into microwave and then transmitted to the receiving device. The proposed method will provide reliable operational and emergency message transmission in mining, which will increase the safety and efficiency of personnel management. 2 Il. The invention relates to communication systems in which the transmission medium is the earth, and in particular to methods of signaling used in mines or tunnels.There is a method of mining a wireless link with the mine workings, including the formation and transmission of emergency audio signal and the reception signal by a receiving device in mines.with. The USSR №578455, CL E 21 35/24, 1975). The disadvantage of this method is that it is only the alarm and there is no possibility of the way mine operational and emergency wireless connection with mining works, including the formation and transmission of alarm and voice electromagnetic sound frequency signals and their reception in mines.with. The USSR №876999, CL E 21 35/24, publ. 30.10.81, BI No. 40) - the prototype. The disadvantage of this method is that the electromagnetic signals of audio frequency when passing through the earth with increasing depth quickly and unevenly fade. This leads to the fact that even at high transmitter power level of a signal in mining, insufficient for reliable communications. The situation is aggravated by the fact that in the audio frequency range in mines very high level of electromagnetic interference. For these reasons, in mines formed numerous “dead zones” in which communication is impossible. In addition, receiving a voice message on the back of high levels of acoustic noise in mines is extremely difficult, and in the absence of reverse communication channel that reduces the reliability of the received information, for example, that in an emergency situation can lead to serious consequences.The purpose of the invention is to enhance reliability of operational and emergency communications with personnel in the mines.This goal is achieved by introducing changes associated with the particular land form a low frequency, and in the underground mine workings, it is converted into microwave and then transmitted to the receiving device.In Fig.1 shows a diagram of the transmission of messages in the underground workings. With the help of the transmitting device 1, the I signal of low frequency is transmitted through the earth 2 mining 3 device 4 frequency conversion, in which the I signal of the low frequency converted to a microwave signal II and then transmitted to the receiving device 5.In Fig.2 presents: the spectrum of the signal I, signal spectrum II, as well as, for comparison, the spectrum of the audio signal in a known way. As is known in the audio frequency spectrum transmitted from the surface of the earth in excavation signal with increasing depth quickly and unevenly along the spectrum fades out. When this uneven attenuation can reach several orders of magnitude. In addition, in the audio range of frequencies very high level of electromagnetic interference. All this requires a more complex receiver. The application of the I signal a low frequency range which is below 50 Hz, allows not only to reduce the attenuation of the signal, but also to get rid of interference. Converting the I signal low frequency microwave signal II allows denial of the s device, for example pagers. In addition, a text message in the conditions of the underground workings has significant advantages over voice message.Thus, the proposed method will provide reliable operational and emergency message transmission in mining, which will increase the safety and efficiency of personnel management.
ClaimsThe sending of messages in the underground workings, including the formation on the surface of the ground signal, the transmission signal using radio waves in the underground workings, the signal at the receiving device, characterized in that the signal on the earth's surface form a low frequency, and in underground mine workings, it is converted into microwave and then transmitted to the receiving device.
FIELD: mining industry.
SUBSTANCE: device has two asynchronous electric engines, connected via reducers to drive sprockets of continuous traction chain, provided with plane carriages with their possible displacement along the guide, and hydraulic cylinders for displacing guide on pit-face. To windings of stators of first and second electric engines connected respectively are outputs of first and second frequency converters, inputs of which are connected to power grid and control inputs of which are connected respectively to outputs of first and second frequency adjusters. To frequency adjusters also connected are inputs of load detectors, to outputs of which load balancing block is connected, outputs of which are connected to inputs of first frequency adjuster. To inputs of both frequency adjusters output of load adjuster is connected, inputs of which are connected to load-setting block and load sensor for second engine. To output of second frequency converter connected are input of control block, other input of which is connected to signal block of base plant, and stator winding of third asynchronous engine, which via mechanical link is connected to first and second hydraulic pumps, having constant working volumes. Output of first hydraulic pump is connected to force hydro-main and input of second preventing hydraulic valve and to first inputs of two-position hydraulic distributors with electromagnetic control, to electromagnets of which outputs of control block are connected. Second inputs of two-positional hydraulic distributors with electromagnetic control are connected to control chambers of hydro-controlled two-positional hydro-distributors, which are part of hydro-blocks. Outputs of hydro-controlled two-positional distributors are connected to opposite hollows of volumetric dosing device of each hydro-block, and their inputs are connected respectively to outputs of hydro-distributors for controlling hydro-cylinder for moving the guide on pit-face, inputs of each of which are connected to force and drain hydro-mains, and outputs are connected to piston and rod hollows of appropriate hydro-cylinder.
EFFECT: higher efficiency.