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Toggle mechanism, combination of solid, usually metallic links (bars), connected by pin (hinge) joints that are so arranged that a small force applied at one point can create a much larger force at another point.
Linkage, in mechanical engineering, a system of solid, usually metallic, links (bars) connected to two or more other links by pin joints (hinges), sliding joints, or ball-and-socket joints so as to form a closed chain or a series of closed chains.
Through the studies on previous coal discharge devices, the following problems were found: (1) In previous type LTCC supports, the front link bar was the double link bar, and the rear link bar was the single link bar.
Currently, the low position top-coal caving support is widely used, which is a chock-shield hydraulic support with positive four-link bar, reverse four-link bar and single swing link bar.
Open image in new window Fig. 40 Coal discharge device. 1 shield beam, 2 tail beam-sliding plate, 3 pump of sliding plate, 4 pump of tail beam, 5 rear link bar, 6 front link bar, 7 base.
Open image in new window Fig. 40 Coal discharge device. 1 shield beam, 2 tail beam-sliding plate, 3 pump of sliding plate, 4 pump of tail beam, 5 rear link bar, 6 front link bar, 7 base .
As a consequence, the positive four-link bar type of support was selected to better suit the ground pressure.
