Adjusts the speed way is the hydraulic pressure velocity modulation, the coal mining machine uses the chain hauling, the rocking shaft may raise, fuselage adjustable slanting, keeps off the coal board to be possible to turn over, raises the hydraulic cylinder to be able in the optional position locking, and locks reliably, raises the hydraulic cylinder, adjusts the slanting hydraulic cylinder and so on to adopt operates alone, overall system safe reliable, the structure compact service is convenient. key word: Coal mining machine, hauling department, hydraulic cylinder, cone-way valve.
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