Background technique
To need to drive the pallet fork lifting by door frame during fork truck work, and the lifting of door frame just need to use hoist cylinder, the impact endurance test shock that hoist cylinder on the fork truck is subject to when working is stronger, affect the working life of oil cylinder, and existing cylinder structure is simple, poor seismic behavior, working life is short, can not satisfy usage requirement.
The model utility content
The purpose of this utility model is in order to remedy the deficiency of prior art, a kind of hoisting cylinder for fork truck with buffer function to be provided, solved existing cylinder structure simple, poor seismic behavior, and working life is short, can not satisfy the problems such as usage requirement.
The utility model is achieved through the following technical solutions:
A kind of hoisting cylinder for fork truck with buffer function, include cylinder barrel and piston rod, it is characterized in that: the cylinder barrel end of described piston rod external part is equipped with cylinder cap by guide sleeve, the external part end of described piston rod and the bottom of cylinder barrel are respectively equipped with threaded mounting hole, upper cover of piston rod in the described cylinder barrel is equipped with two spring retaining sleeves, upper cover of piston rod between the described spring retaining sleeve is equipped with damping spring, the bottom of described cylinder barrel is provided with the oil-feed mouth of pipe that is communicated with the cylinder barrel cavity, is provided with the oil return mouth of pipe near the cylinder cap position on the described cylinder barrel sidewall; The contact position of described cylinder cap and piston rod external part is tightly connected by Sealing, and the piston of described piston rod end is slidingly matched by bearing support and inner wall of cylinder, and is sealed and matched by seal ring between supporting frame and the inner wall of cylinder.
Described piston rod is fixedly mounted on the door frame by the threaded mounting hole of end, and described cylinder barrel bottom is fixedly mounted on the frame fitting seat by the threaded mounting hole by the end.
Described cylinder cap also is provided with dust ring with the contact position of the piston rod that stretches out.
Its principle is: by two spring retaining sleeves on the piston rod in the cylinder barrel and the structural design of damping spring, when oil cylinder can play buffer function when shrinking, the impact endurance test shock that has been subject to when having avoided hoist cylinder work is stronger, affect the problem in working life, can make the work of oil cylinder safety and stability, increase simultaneously the working life of oil cylinder.
The utility model has the advantages that:
The utility model is crossed two spring retaining sleeves on the piston rod in the cylinder barrel and the structural design of damping spring, and the impact endurance test shock that has been subject to when having avoided hoist cylinder work is stronger, can make the work of oil cylinder safety and stability, has increased simultaneously the working life of oil cylinder.
Embodiment
Referring to accompanying drawing, a kind of hoisting cylinder for fork truck with buffer function, include cylinder barrel 1 and piston rod 2, cylinder barrel 1 end of piston rod 2 external parts is equipped with cylinder cap 4 by guide sleeve 3, the external part end of piston rod 2 and the bottom of cylinder barrel 1 are respectively equipped with threaded mounting hole 5,6, be set with two spring retaining sleeves 7,8 on the piston rod 2 in the cylinder barrel 1, be set with damping spring 9 on the piston rod 2 between the spring retaining sleeve 7,8, the bottom of cylinder barrel 1 is provided with the oil-feed mouth of pipe 10 that is communicated with cylinder barrel 1 cavity, is provided with the oil return mouth of pipe 11 near cylinder cap 4 positions on cylinder barrel 1 sidewall; Cylinder cap 4 is tightly connected by Sealing with the contact position of piston rod 2 external parts, and the piston of piston rod 2 ends is slidingly matched by bearing support 12 and cylinder barrel 1 inwall, and is sealed and matched by seal ring 13 between supporting frame 12 and cylinder barrel 1 inwall; Piston rod 2 is fixedly mounted on the door frame by the threaded mounting hole 5 of end, and cylinder barrel 1 bottom is fixedly mounted on the frame fitting seat by the threaded mounting hole 6 by the end; Described cylinder cap 4 also is provided with dust ring 14 with the contact position of the piston rod 2 that stretches out.