Synchronous monitoring device and method for radial and axial vibration of shearer drum

A synchronous monitoring method for radial and axial vibration of a shearer drum, comprising the following steps:

• 1) starting a shearer, so that a shearer drum is normally operated in a fully-mechanized mining face, and a laser starts to output light;
• and output light of the laser enters a first optical fiber coupler from a port (20) and the output light is equally divided into two beams of light, wherein:
• a first beam of light output from a port (21) enters an optical isolator from a port (31) and is output from a port (32), then the first beam of light enters a third optical fiber coupler from a port (52) and is output from a port (54), and finally the first beam of light enters an optical fiber collimator to form a parallel light beam perpendicularly irradiating a reflective coating on the shearer drum, and the parallel light beam is reflected by the reflective coating and then is re-coupled to the optical fiber collimator to form a coupled light beam;
• and
• a second beam of light output from a port (22) enters a second optical fiber coupler from a port (42);
• 2) the coupled light beam enters the third optical fiber coupler from the port (54) and is equally divided into three beams of light, wherein:
• a third beam of light output from a port (51) enters the second optical fiber coupler from a port (41) and then interferes with the second beam of light entering the second optical fiber coupler from the port (42) to form interference light, and the interference light is input to a first photodetector from a port (40);
• a fourth beam of light output from a port (50) is directly input to a second photodetector;
• and
• a fifth beam of light output from the port (52) is isolated by an optical isolator;
• 3) the first photodetector converts a first optical signal into a first electrical signal and then inputs the first electrical signal to a first signal processing module, and the second photodetector converts the optical signal into a second electrical signal and then inputs the second electrical signal to a second signal processing module;
• wherein the first optical signal is formed by the first beam of light, the second beam of light, the third beam of light, the fourth beam of light and the fifth beam of light;
• and
• 4) the first signal processing module processes the first electrical signal:
• axial vibration of the shearer drum causes a change in a phase of a second optical signal formed by the third beam of light entering the second optical fiber coupler from the port (41), so that a phase difference is generated between the second optical signal and a third optical signal formed by the second beam of light entering the second optical fiber coupler from the port (42) and the first signal processing module demodulates the first electrical signal containing phase difference information transmitted by the first photodetector so as to obtain axial vibration information of the shearer drum, thereby achieving monitoring of the axial vibration of the shearer drum;
• and
• the second signal processing module processes the second electrical signal:
• radial vibration of the shearer drum causes a change in a relative position of the reflective coating and the light beam emitted from the optical fiber collimator, so that an intensity of the light beam entering the third optical fiber coupler from the port (54) changes relative to an original light intensity, and the second signal processing module demodulates the second electrical signal containing light intensity information transmitted by the second photodetector so as to obtain radial vibration information of the shearer drum, thereby achieving monitoring of the radial vibration of the shearer drum.