The oil hydraulic cylinder of the adjustable throttling of a kind of two benches and cushion stroke
Technical field
The present invention is the damping device oil hydraulic cylinder of the adjustable throttling of a kind of two benches and cushion stroke.
Background technique
At present, the permanent throttling buffering device of known oil hydraulic cylinder, a mainly cylinder cushion device, specifically during a kind of hydraulic cylinder works, pressure oil liquid promotes piston rod to-and-fro motion, when preventing piston rod movement from arriving bottom, speed, plays greater impact to connection device, at the damping device that tailpiece of the piston rod is installed, time when cannot regain piston rod adjusts, and prosthetic is not strong.
Summary of the invention
The object of the invention is to the deficiency overcoming above-mentioned oil hydraulic cylinder throttling buffering device, the oil hydraulic cylinder of the adjustable throttling of a kind of two benches and cushion stroke is provided, this device can not only realize permanent throttling buffering, and motion speed whole process is adjustable when can need to regain piston rod according to connection device, without throttling buffering or throttling buffering not obvious time can repair.
Technological scheme of the present invention is: comprise cylinder body, piston rod, piston, also comprises the valve block being loaded on cylinder base, and valve block is provided with for the stroke adjusting device of the regulating piston throw of lever, for being communicated with the oil duct three of hydraulic cylinder cavity and external hydraulic system; Stroke adjusting device comprises stroke regulating lever, controlling rod, adjustment seat, and controlling rod connects stroke regulating lever through adjustment seat, and stroke regulating lever is provided with oil duct one; Valve block is also provided with when first-level buffer oil duct, the level 2 buffering oil duct two for cushioning piston rod after piston rod end face contacts with stroke regulating lever for cushioning piston rod before piston rod end face contacts with stroke regulating lever; Oil duct is connected with oil duct three once first-level buffer oil duct, the large throttling valve core be loaded on first-level buffer oil duct, and level 2 buffering oil duct two is connected with oil duct three through little throttling valve core.
Described piston rod is provided with endoporus, and interior nose end is equipped with the buffering copper sheathing for coordinating stroke regulating lever.
Described buffering copper sleeve inner hole coordinates with stroke regulating lever cylindrical for transition fit.
The bore depth L of described piston rod is greater than stroke regulating lever and stretches out the longest degree of depth of valve block length.
Described buffering copper sleeve inner hole end, stroke adjustment boom end are provided with chamfering.Described stroke regulating lever cylindrical is fit tolerance h7/H8 with the endoporus of buffering copper sheathing, and degree of finish is Ra1.6.
Described oil duct one aperture is greater than 3 ~ 4 times of level 2 buffering oil duct two aperture.
Described valve block is provided with the endoporus for assembling stroke regulating lever, controlling rod, adjustment seat, and the endoporus of stroke regulating lever cylindrical and valve block is transition fit.Fit tolerance h7/H8, degree of finish is Ra1.6.
Described valve block is provided with the mounting hole for assembling large throttling valve core and little throttling valve core, and large throttling valve core and little throttling valve core bottom end face and mounting hole are that circular contact grinds to coordinate and makes it have sealing.
Described oil duct three is equipped with one-way valve near hydraulic cylinder cavity end.The effect of one-way valve prevents hydraulic oil from from cylinder body, flowing into external hydraulic system.
Described adjustment seat end dress pad, adjustment seat is fixed by screw thread and cylinder bottom valve block, and controlling rod is connected with stroke regulating lever by screw thread.
Hydraulic cylinder bottom valve block is provided with the level 2 buffering oil duct two (being called for short oil duct two) be connected with hydraulic fluid port by little throttling valve core, and this oil duct two hole is less than above-mentioned oil duct one hole.Oil duct two is connected with hydraulic system through turnover oil duct three.When stroke regulating lever does not contact with copper sheathing inner peripheral wall, hydraulic oil runs mainly through the oil duct one of large throttle valve control, by regulating large throttle valve core hydraulic control oil flow, and then control piston rod motion speed when stroke regulating lever does not contact with copper sheathing inner peripheral wall.After stroke regulating lever contacts with copper sheathing inner peripheral wall, oil duct two operation that hydraulic oil in the oil pocket that stroke regulating lever outer wall and cylinder barrel inner peripheral wall are formed is controlled by little throttling valve core, by regulating little throttle valve core hydraulic control oil flow, and then control piston bar motion speed.Turnover oil duct three be positioned at cylinder bottom valve block interior edge face place, be provided with fluid when preventing piston rod from regaining and flow back to the one-way valve of hydraulic system through oil duct, prevent fluid from then on oil duct three flow back to system.In stroke regulating lever right-hand member, hole end surface is provided with for forming the conical surface of ring-type oil passage with copper sheathing front-end face, copper sheathing inner peripheral surface; Stroke regulating lever ear end face is provided with the oil passage that connects with hydraulic fluid port to be communicated with oil passage one when stroke regulating lever does not contact with cylinder barrel inner peripheral wall.
Compared with prior art, it is simple that the present invention has structure, and product is easily processed, and product delivery-check qualified rate is high, defective recoverable feature.When pressure oil liquid promotes piston rod retraction movement, can be divided into the two-stage control piston rod movement time, omnidistance motion speed is adjustable.
Accompanying drawing explanation
Fig. 1 is one of structural representation of the present invention.(piston rod movement is to middle part state).
Fig. 2 is structural representation two of the present invention.(piston rod movement is to stroke regulating lever and buffering copper sheathing contact condition).
Fig. 3 is the structural representation of stroke regulating lever.
Fig. 4 structural representation that to be piston rod assemble with buffering copper sheathing and sectional view.
Fig. 5 is the assembling schematic diagram of controlling rod, valve block, stroke regulating lever.
Fig. 6 is that the A of Fig. 5 is to structural representation.
Fig. 7 is the B-B cut-away view of Fig. 5.
Fig. 8 is the C-C cut-away view of Fig. 5.
Fig. 9 is the D-D cut-away view of Fig. 5.
Figure 10 is the E-E cut-away view of Fig. 5.
Figure 11 is the F-F cut-away view of Fig. 5.
Figure 12 is the G-G cut-away view of Fig. 5.
Figure 13 is the worm's eye view of Fig. 5.
Figure 14 is the A-A cut-away view of Figure 13.
Embodiment
In Fig. 1,2, the present invention includes cylinder body 10, piston rod 9, valve block 4, be loaded on the stroke regulating lever 6 in valve block 4, controlling rod 1, adjustment seat 2, pad 3, one-way valve 5, large throttling valve core 12, little throttling valve core 13, be loaded on the buffering copper sheathing 7 in piston rod 9.Piston 8 is arranged on piston rod 9 neat with end face, is provided with the endoporus for coordinating with stroke regulating lever 6 in the bar of piston rod 9 front end in the heart, and buffering copper sheathing 7 is loaded in the endoporus of piston rod 9 front end.Buffering copper sheathing 7 and piston rod 9 are pressed into by forced fit tolerance and are connected, and Cock screw is called the roll in the morning, and piston rod 9 bore depth is greater than length when stroke regulating lever 6 regulates the longest.Valve block 4 is equipped with for the stroke regulating lever 6 with buffering copper sheathing 7 inner hole.Valve block 4 is provided with controlling rod 1 and adjustment seat 2, controlling rod 1 is placed on adjustment seat 2 li, adjustment seat 2 end dress pad 3, adjustment seat 2 and controlling rod 1 are fixed by screw thread and valve block 4, controlling rod 1 can be rotated freely, controlling rod 1 is connected with stroke regulating lever 6 by screw thread, stretches out the length bottom valve block 4 by pivoting lever 1 adjustment stroke adjustable lever 6, the distance of hydraulic control cylinder first stage and second stage buffering.On valve block 4, large throttling valve core 12 is connected with cylinder bottom valve block 4 by screw thread with little throttling valve core 13, respectively by clockwise and be rotated counterclockwise large throttling valve core 12 and little throttling valve core 13, by bottom large throttling valve core 12 and little throttling valve core 13 with the gap length of valve block 4 and then control uninterrupted.
Wherein, stroke regulating lever 6 cylindrical is fit dimension h7/H8 with the endoporus of buffering copper sheathing 7, and degree of finish is Ra1.6.The endoporus of stroke regulating lever 6 cylindrical and valve block 4 is transition fit.Fit tolerance h7/H8, degree of finish is Ra1.6.Stroke regulating lever 6 external diameter is less than the aperture of buffering copper sheathing 7.Valve block 4 is provided with the mounting hole for assembling large throttling valve core 12 and little throttling valve core 13, and large throttling valve core 12 and little throttling valve core 13 bottom end face and mounting hole are that circular contact grinds and coordinates, and make it have sealing.
When piston 8 drives piston rod 9 and buffering copper sheathing 7 to 4 end motion of valve block, when piston rod 9 end face does not contact with stroke regulating lever 6 with buffering copper sheathing 7 (as Fig. 1), hydraulic oil gets back to hydraulic fluid port 18 mainly through oil duct 1 through excessive throttling valve core 12, by regulating the degree of tightness of large throttling valve core 12 to control flow, regulating piston 8 drives the motion speed of piston rod 9 and buffering copper sheathing 7 first stage.
When external pressure fluid promotes piston 8, buffering copper sheathing 7 and piston rod 9 associated movement by guide sleeve 11 oil duct 4 17, when buffering copper sheathing 7 enters stroke regulating lever 6 conical surface 6-1, seal, oil duct 1 is closed, passing in and out oil duct 3 14 through too small throttling valve core 13 after fluid enters oil duct 2 16 by cylinder body 10 and get back to hydraulic system, the effect of throttling buffering can be reached, if cushioning effect is undesirable by regulating little throttling valve core 13, can repair separately part, reach buffer requirements.
When piston 8 drives piston rod 9 and buffering copper sheathing 7 to 4 end motion of valve block, cushion copper sheathing 7 bottom piston rod 9 to contact with stroke regulating lever 6 rear (as Fig. 2), oil duct 1 is closed, hydraulic oil gets back to hydraulic fluid port 18 mainly through the oil duct 2 16 on valve block 4 through little throttling valve core 13, by regulating the degree of tightness of little throttling valve core 13 to control flow, regulating piston 8 drives the motion speed of piston rod 9 and buffering copper sheathing 7 second stage.
Because motion speed is faster than second stage when first stage is run, when oil duct 1 is closed, hydraulic oil gets back to hydraulic fluid port 18 mainly through the oil duct 2 16 on cylinder bottom valve block 4 through little throttling valve core 13.Adjustment first stage and second stage buffering length obtain by regulating the controlling rod 1 of cylinder bottom valve block, lever for adjusting oil 1 time clockwise, and first stage piston 8, piston rod 9 shorten, otherwise then accelerate working time; Regulate large throttling valve core 12 time clockwise, flow diminishes, and first stage piston 8, piston rod 9 are slack-off for working time, otherwise then accelerate; The little throttling valve core 13 of clockwise adjustment, flow diminishes, and second stage piston 8, piston rod 9 are slack-off for working time, otherwise then accelerate.
In Fig. 3, damping device comprises buffering copper sheathing 7, the stroke regulating lever 6 be arranged on cylinder body valve block 4, large throttling valve core 12 and little throttling valve core 13.Buffering copper sleeve inner hole coordinates with stroke regulating lever 6 cylindrical for transition fit, and fit tolerance is H8/h7.Conical surface 6-1 leaves at stroke regulating lever 6 cylindrical.In figure, R=5, a=4 ~ 5, e=20o.
In Fig. 4, buffering copper sheathing 7 is arranged in piston rod 9 hole, and piston rod 9 endoporus is deeper than stroke regulating lever 6 and stretches out cylinder bottom valve block 4 longest distance, and conical surface 7-1 leaves at buffering copper sheathing 7 endoporus, in figure, and R=5, a=4 ~ 5, e=20o.
In Fig. 5-14, stroke regulating lever 6, large throttling valve core 12 and little throttling valve core 13, controlling rod 1, adjustment seat and one-way valve 6 are arranged on valve block 4.Cylinder bottom valve block 4 internal oil channel 3 14 ear end face is provided with hydraulic fluid port 18 and is connected with hydraulic system, front-end face dress one-way valve 5.One-way valve 5 and hydraulic fluid port 18 are directly connected, and the effect of one-way valve 5 prevents hydraulic oil from from cylinder body, flowing into external hydraulic system.Stroke regulating lever 6 is provided with the oil duct 1 connected through first-level buffer oil duct and hydraulic fluid port 18 by large throttling valve core 12 adjust flux, the hydraulic fluid port 18 of oil duct 1 through passing in and out oil duct 3 14 is connected with hydraulic system, and valve block 4 is provided with the oil duct 2 16 being connected the hydraulic fluid port 18 and cylinder body 10 be connected with hydraulic system by little throttling valve core 13.
The hydraulic oil running route entering oil duct 2 16 is: the outlet of 24 is the intermediate portion, 23 of oil duct two to be the entrance, 25 of oil duct two be oil duct two, and namely hydraulic oil arrives hydraulic fluid port 18(as Fig. 7,14 through the entrance part 23 of oil channel 2 16, little throttling valve core 13, intermediate portion 24, outlet 25 successively).
The hydraulic oil running route entering oil duct 1 is: 20, the entrance, 22 of 21 to be first-level buffer oil duct, 19 be oil ducts one is the outlet of oil duct one, and namely hydraulic oil arrives hydraulic fluid port 18(as Fig. 8,14 through the entrance part 19 of oil channel 1, large throttling valve core 12, first-level buffer oil duct, outlet 22 successively).