Jack
Technical field:
The utility model relates to the hydraulic pressure push unit, and particularly a kind of jack can realize that under the hydraulic oil effect both direction drives.
Background technology:
In the existing technology, hydraulic jack is merely able to realize folk prescription usually to the driving operation, and magnification ratio is little, thus in needs two-way operation and big magnification ratio, used jack structure complexity, assembly is more, uses very inconvenient.Particularly be directed to the hydraulic support that uses in the mining, between two filling supports that front and back are vertically arranged, often need former and later two direction traversing carriages, and bigger flexible step pitch difficulty relatively often.
The utility model content:
The purpose of this utility model is to provide a kind of jack, described this jack to solve in the prior art jack can only folk prescription to driving, and the little technical matters of magnification ratio.
The purpose of this utility model is achieved through the following technical solutions: comprise cylinder body, piston rod and piston, wherein, described piston rod is the cavity body structure of hollow, be provided with second cylinder body of an end opening in the piston rod, this piston rod runs through the two ends of cylinder body, the cylinder body two ends are provided with end cap, in piston rod, also be provided with second piston rod and second piston, piston is fixed in the middle part of piston rod, the two ends of cylinder body are respectively equipped with first oilhole and second oilhole, the two ends of piston rod are respectively equipped with the 3rd oilhole and the 4th oilhole, second piston is fixed in an end of second piston rod, the other end of second piston rod stretches out from the open end of second cylinder body, and the opening part of second cylinder body is provided with another end cap.
Second piston is fixed in an end of second piston rod.
Be provided with sealing member between described cylinder body two ends and the end cap.
Be provided with sealing member between the open end of described piston rod and another end cap.
Principle of work of the present utility model is: when needing piston rod to stretch out, liquid enters from second oilhole of cylinder body right-hand member, flows in the oil pocket that right end cap, piston right-hand member and piston rod by the inwall of cylinder body, cylinder body constitute, and promotes piston rod and stretches out; When needing piston rod to regain, liquid enters from first oilhole of cylinder body left end, flows in the oil pocket that left end cap, piston left end and piston rod by the inwall of cylinder body, cylinder body constitute, and piston rod is regained.When needing second piston rod to stretch out, liquid enters from the 3rd oilhole of piston rod left end, flows in the oil pocket that is made of the piston rod inwall and the second piston left end, promotes second piston rod and stretches out; When needing second piston rod to regain, liquid enters from the 4th oilhole of piston rod right-hand member, flows in the oil pocket that is made of piston rod inwall, the second piston right-hand member and second piston rod, and right push rod is regained.
The utility model is compared with prior art, and its effect is actively with tangible.The utility model adopts the piston rod that has cavity in jack, this piston rod is provided with second piston rod as the internal layer cylinder body in piston rod, can form the beidirectional jack so that two piston rods of this jack drive to both direction respectively; When two piston rods all when same direction drives, the ranging coverage of whole piston rod increases, and has increased the magnification ratio of this jack, makes jack structure compacter.Second piston is fixed in an end of second piston rod, can increase the magnification ratio of jack.
Description of drawings:
Fig. 1 is the structural representation of the utility model jack first embodiment.
Embodiment 1:
As shown in Figure 1, described jack, comprise cylinder body 1, piston rod 4 and piston 2, wherein, described piston rod 4 is the cavity body structure of hollow, be provided with second cylinder body of right-end openings in the piston rod 4, this piston rod 4 runs through the two ends of cylinder body 1, cylinder body 1 two ends are provided with end cap 14, in piston rod 4, also be provided with second piston rod 5 and second piston 3, piston 2 is fixed in the middle part of piston rod 4, the two ends of cylinder body 1 are respectively equipped with first oilhole 10 and second oilhole 11, and the two ends of piston rod 4 are respectively equipped with the left end that the 3rd oilhole 12 and the 4th oilhole 13, the second pistons 3 are fixed in second piston rod 5, the right-hand member of second piston rod 5 stretches out from the right-end openings end of second cylinder body, and the opening part of second cylinder body is provided with another end cap 15.Be provided with sealing member between described cylinder body 1 two ends and the end cap 14, be provided with sealing member between the open end of described piston rod 4 and another end cap 15.The inwall of cylinder body 1, the left end cap of cylinder body, piston 2 left ends and piston rod constitute first oil pocket 6, the inwall of cylinder body, the right end cap of cylinder body, piston right-hand member and piston rod constitute second oil pocket 7, the piston rod inwall and the second piston left end constitute the 3rd oil pocket 8, and piston rod inwall, the second piston right-hand member and second piston rod constitute the 4th oil pocket 9.
Working process of the present utility model is: when left push rod stretched out, liquid entered from second oilhole, flow in second oil pocket that right end cap, first piston right-hand member and left push rod by the inwall of cylinder body, cylinder body constitute, and promoted left push rod and stretched out.When left side push rod was regained, liquid entered from first oilhole, flow in first oil pocket that left end cap, first piston left end and left push rod by the inwall of cylinder body, cylinder body constitute, and left push rod is regained.When right push rod stretched out, liquid entered from the 3rd oilhole, flows in the 3rd oil pocket that is made of the left push rod inwall and the second piston left end, promotes right push rod and stretches out.When right push rod was regained, liquid entered from the 4th oilhole, flows in the 4th oil pocket that is made of left push rod inwall, the second piston right-hand member and right push rod, and right push rod is regained.
Jack of the present utility model is particularly useful for as the passing jack between the split type paste body filling support: when step pitch of side arm reach, the left push rod of passing jack stretches out a step pitch under the effect of first piston, and after-frame is motionless; When side arm moved forward a step pitch again, the right push rod of passing jack stretched out a step pitch under the effect of second piston, the counteraction step pitch that on side arm, makes it to move forward, and after-frame is still motionless; When side arm moved forward the 3rd step pitch, the right push rod of passing jack stretched out a step pitch under the effect of second piston, the counteraction step pitch that on side arm, makes it to move forward, and it is motionless that after-frame continues to keep; When side arm moved forward the 4th step pitch again, frame fell in after-frame, passed jack and regained, and after-frame is finished under the effect of right push rod and moved frame.
Except technique scheme, described piston rod also can be the rod member with left end opening, at this moment piston rod and direction of second piston rod transposing is got final product.