Hydraulic double-acting drilling reamer
A double-acting, hydraulic technology, applied to drilling equipment, drill bits, earthwork drilling and production, etc., can solve problems such as inability to effectively complete hole reaming operations and low work safety, and achieve improved work safety, high work reliability, Ensuring the effect of cooling the cutting teeth
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[0013] According to Figure 1, Figure 2 and Figure 3, when the reamer is not working, the reamer blade 5 retracts and maintains the state as shown in the figure. The lower end of the center tube 2 is provided with a tapered flow port 12, and when the discharge is working, the flow area of the flow port is larger and the pressure head loss is small. When the displacement is increased, the compression amount of the spring 9 increases, and the valve plate 7 (or valve ball 19) contacts the inclined surface of the overflow port 12. The overflow area of the overflow port is reduced, and the pressure head loss is large, resulting in a larger direction. The downward thrust is to reasonably set the stiffness of the spring so that the downward thrust is greater than the supporting force of the spring 9. Under the action of the thrust, the central tube 2 moves downward in the axial direction. The downwardly moving center tube 2 pushes the crank 6 to move downward, and the blade 5 is conne...
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