Multifunctional coal mine safety detection bar and manufacturing method thereof

The invention relates to a multifunctional coal mine safety detection bar for detecting spontaneous combustion hidden trouble points of coal seams and a manufacturing method thereof. The multifunctional coal mine safety detection bar comprises an outer sleeve, a middle sleeve, an inner sleeve, a mine thermometer, a tail end plug and a front end plug, wherein the outer sleeve is of a hollow structure, and internal threads are arranged on the inner walls of the two ends of the outer sleeve; the middle sleeve is of a hollow structure, one end of the middle sleeve is connected with the outer sleeve and is provided with external threads, and the other end of the middle sleeve is provided with internal threads; the inner sleeve is of a hollow structure and is provided with external threads matched with the internal threads of the middle sleeve, and the other end of the inner sleeve is provided with a detection head; the mine thermometer is installed at one end of the inner sleeve close to the detection head; the tail end plug is connected with the outer sleeve through threads and is provided with a through hole for connecting an airbag; and the front end plug is connected with the other end of the outer sleeve through threads and is provided with a pit matched with the mine thermometer. The multifunctional coal mine safety detection bar has multiple functions of measuring coal seam temperature, collecting gas, being used as a walking stick for walking in a tunnel, and the like; the multifunctional coal mine safety detection bar has a retractable structure and is low in cost, simple and easy to use, exquisite and beautiful as well as fast and convenient; and the multifunctional coal mine safety detection bar is made of aluminum alloy, and then the weight of the traditional long rod made of iron is relieved, so that the multifunctional coal mine safety detection bar is portable and is convenient to use.