CN203201900U - Hydraulic cylinder - Google Patents

Hydraulic cylinder Download PDF

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Publication number
CN203201900U
CN203201900U CN 201320196465 CN201320196465U CN203201900U CN 203201900 U CN203201900 U CN 203201900U CN 201320196465 CN201320196465 CN 201320196465 CN 201320196465 U CN201320196465 U CN 201320196465U CN 203201900 U CN203201900 U CN 203201900U
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CN
China
Prior art keywords
cylinder
hydraulic cylinder
piston
oil hydraulic
plunger case
Prior art date
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Active
Application number
CN 201320196465
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Chinese (zh)
Inventor
何曦
周晓峰
费昌寿
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Hunan Valin Xiangtan Iron and Steel Co Ltd
Hunan Hualing Xiangtan Iron and Steel Co Ltd
Original Assignee
Hunan Hualing Xiangtan Iron and Steel Co Ltd
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Priority to CN 201320196465 priority Critical patent/CN203201900U/en
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Publication of CN203201900U publication Critical patent/CN203201900U/en
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Abstract

A hydraulic cylinder is composed of an end cover, a cylinder body, a piston rod, a piston and a sealing piece, wherein relief grooves are formed in the inner wall, corresponding to the tail end position of the stroke of the piston, of the cylinder body, the relief grooves are evenly distributed along the inner wall of the cylinder body and are inclined-ditch grooves, and the included angle between the bottom of each relief groove and the axis of the cylinder body is 8-15 degrees. A pulling-back cylinder is arranged at the tail end of the stroke of the piston and used for stopping a plunger-type cylinder. Pressure oil on the piston side of the hydraulic cylinder is removed in a relief mode through the relief grooves in the position close to the end segment of the stroke, therefore, pushing force of the hydraulic cylinder is reduced, and the hydraulic cylinder is protected; the relief grooves can not damage the sealing ring, the sealing ring can be led into a sealing groove intactly when taken back along with the piston, and the sealing ring can not be damaged.

Description

Oil hydraulic cylinder
Technical field
The utility model belongs to hydraulic equipment, is a kind of oil hydraulic cylinder.
Background technique
Common oil hydraulic cylinder is comprised of end cap, cylinder body, piston rod, piston, seal ring spare as shown in Figure 1.The general method that prevents ultralimit is backstop.In the accompanying drawing 1 end cap by bolt with or cylinder body link together, form backstop, can limit the oil hydraulic cylinder range.Also have in addition the mode of electrical equipment interlock protection to prevent ultralimit.But oil hydraulic cylinder is in debugging and running, under the unusual conditions such as misoperation, non-loaded or apparatus failure, oil hydraulic cylinder stretch out or be retracted into the limit after continue to apply oil pressure, thrust hydraulic cylinder or pulling force exceed the mechanical connection intensity of end cap and cylinder body, will go out extreme limit of travel.The damage of this burst often causes the equipment significant trouble and can't recover for a long time, and we need a kind of device to protect oil hydraulic cylinder, and can recover rapidly normal operation after unusual condition is eliminated.
For example the plunger case of metallurgy industry heavy plate mill automatic thickness control employing is shown in accompanying drawing 2, accompanying drawing 3.It is that the external force such as weight is regained that plunger case relies on retract cylinder and roller on its four angles.The general diameter 500~1600mm of oil hydraulic cylinder that present heavy plate mill adopts, hydraulic cylinder works pressure is up to about 280bar, and thrust hydraulic cylinder is maximum above 6000 tons.Because this plunger case area is very large, very little oil pressure will produce very large thrust at oil hydraulic cylinder, therefore often be difficult to arrange the common mechanical limits such as end cap protection.The thrust of plunger case is considerably beyond the limit that retracts cylinder and can bear.So the simple method that retracts cylinder restriction plunger case stroke that adopts is unworkable, plunger case is often gone out the limit and is damaged.Through collecting the broken fragments analysis, seal ring is bearing pressure and is deviating from the cylinder sleeve short time set, and part is extruded the seal groove on the piston, can't restore.Then cut off by piston and cylinder sleeve in plunger case pressure release falling process, this is the direct source of damage.Iff preventing the oil hydraulic cylinder ultralimit by spacing measures such as backstops according to the conventional method, then backstop must consider to bear the thrust hydraulic cylinder under the maximum system pressure.Therefore the backstop that needs can be very huge, and be subjected to spatial constraints, large-scale backstop can't be set herein.In case similar fault occurs, not only overhaul the replacing time long, and the oil hydraulic cylinder maintenance expenses is high.
The model utility content
The utility model aims to provide a kind of oil hydraulic cylinder that can eliminate above-mentioned prior art defective, can realize oil hydraulic cylinder overtravel limit protection.
The technical solution of the utility model:
Oil hydraulic cylinder is comprised of end cap, cylinder body, piston rod, piston, seal ring, it is characterized in that: open gas pressure relief slot at inboard wall of cylinder block corresponding to the piston stroke terminal position.
Gas pressure relief slot is along the inboard wall of cylinder block circumference uniform distribution, and gas pressure relief slot is valley gutter, and the bottom becomes 8~15 ° of angles with the cylinder body axis.
Make backstop with retracting cylinder at the piston stroke end.
After inboard wall of cylinder block was opened gas pressure relief slot, seal ring can not damage after back and forth by gas pressure relief slot.Near the hydraulic cylinder travel latter end time, by gas pressure relief slot the pressure oil in the oil hydraulic cylinder is let out and removed, thereby thrust hydraulic cylinder is reduced to be no more than the safety range of end cap or backstop ability to bear.
The gas pressure relief slot bottom becomes 8~15 angles with the cylinder body axis; so not only be conducive to in the pressure leak process slightly the seal ring of distortion lead back groove on the piston; and put from pressure release and can realize between the limit travel that the pressure release flow becomes positive correlation with displacement; oil hydraulic cylinder oil pressure after surpassing pressure release point can be dropped to rapidly enough low, with the protection oil hydraulic cylinder.
Be to eliminate deflection, thereby make the circumferential gap between piston and the cylinder barrel even, prevent that seal ring is extruded groove on the piston from the slit larger part, the piston of oil hydraulic cylinder and piston rod will have good guiding and elimination deflection in whole pressure leak process.
The oil pressure of oil hydraulic cylinder remnants need to arrange mechanical stop at the piston stroke latter end during for the opposing pressure release.This backstop can stop it to continue motion when hydraulic cylinder piston reaches end of travel.This backstop can be that the part of oil hydraulic cylinder itself also can be other device of oil hydraulic cylinder outside.With retract cylinder at the piston stroke end to plunger case as a kind of backstop, have better cushioning effect.
The utlity model has following advantage: offer gas pressure relief slot, near the stroke latter end time, by gas pressure relief slot the pressure oil of hydraulic cylinder piston side is let out and removed, thereby reduce thrust hydraulic cylinder, be no more than the backstop limit, thus the protection oil hydraulic cylinder; Gas pressure relief slot itself can not damage seal ring, and the intact importing of seal ring can be returned seal groove when seal ring is regained with piston, and is unlikely damage.Namely, exceed working stroke, oil hydraulic cylinder is protected automatically; Get back to working stroke, oil hydraulic cylinder can recover normal operation voluntarily.
Description of drawings
The common hydraulic cylinder structure schematic diagram of Fig. 1.
Fig. 2 is plunger case profile schematic diagram.
Fig. 3 is the plunger case structure diagram.
Fig. 4 is plunger case of the present utility model and gas pressure relief slot structural representation.
Fig. 5 is for retracting the cylinder structure schematic diagram.
Among the figure: 1-end cap, 2-cylinder body, 3-piston rod, 4-piston, 5-hydraulic cylinder sealing circle, 6-retract cylinder, 7-plunger case, 8-plunger, 9-gas pressure relief slot, 10-pressing plate, 11-plunger case seal ring, 12-cylinder sleeve, 13-retract the cylinder piston, 14-retract cylinder end cap, 15-distance ring, 16-retract the cylinder cylinder sleeve, 17-retract the cylinder piston.
Embodiment
Oil hydraulic cylinder comprises by end cap (1), cylinder body (2), piston rod (3), piston (4), hydraulic cylinder sealing circle (5) forming.Stretch out corresponding to piston (4) or gas pressure relief slot (9) is opened in the end of travel position of regaining at cylinder body (2) inwall.The valley gutter of gas pressure relief slot (9) for leaving on cylinder body (2) inwall, circumference uniform distribution, and all corner angle are smooth.Like this, plunger case seal ring (11) back and forth can not damage afterwards by gas pressure relief slot (9).Near the hydraulic cylinder travel latter end time, by gas pressure relief slot (9) pressure oil in the oil hydraulic cylinder is let out and removed, thereby thrust hydraulic cylinder is reduced to be no more than the safety range of backstop ability to bear.
Gas pressure relief slot (9) bottom becomes 8~15 ° of little angles with cylinder body (2) axis.So not only be conducive to in the pressure leak process slightly the plunger case seal ring (11) of distortion lead back groove on the piston (4); and put from pressure release and can realize between the limit travel that the pressure release flow becomes positive correlation with displacement; oil hydraulic cylinder oil pressure after surpassing pressure release point can be dropped to rapidly enough low, with the protection oil hydraulic cylinder.
For eliminating deflection, thereby make the circumferential gap between piston (4) and the cylinder barrel (2) even, prevent that sealing is extruded groove on the piston (4) from the slit larger part, the piston of oil hydraulic cylinder (4) and piston rod (3) will have good guiding and elimination deflection in whole pressure leak process.
The oil pressure of oil hydraulic cylinder remnants need to arrange mechanical stop at piston (4) stroke latter end during for the opposing pressure release.This backstop can stop it to continue motion in hydraulic cylinder piston (4) when reaching end of travel.This backstop can be that the part of oil hydraulic cylinder itself also can be other devices of oil hydraulic cylinder outside.For example the end cap of accompanying drawing 1 (1) is exactly one type backstop.The cylinder (6) that retracts of the present embodiment such as accompanying drawing 3 forms a kind of backstop at end of travel to plunger case (7).
Below for the example of a major diameter plunger case.The major diameter plunger case is an extreme example in the oil hydraulic cylinder.It is simple that other common hydraulic cylinder structure is wanted, and this device is more easily implemented.
Plunger case structure such as accompanying drawing 4: formed by plunger (8), pressing plate (10), plunger case seal ring (11), cylinder sleeve (12).Stretch out the end of travel position at cylinder sleeve (12) corresponding to plunger (8) and open gas pressure relief slot (9).Gas pressure relief slot (9) become very little angle with cylinder sleeve (12) axis, and all corner angle is smooth for the groove of the circumference uniform distribution left on the cylinder sleeve (12).Like this, plunger case seal ring (11) back and forth can not damage afterwards by gas pressure relief slot (9).Near plunger case stroke latter end the time, by gas pressure relief slot (9) pressure oil of plunger case is let out and removed, be no more than the safety range that retracts the cylinder end cap ability to bear thereby thrust hydraulic cylinder is reduced to.
Because gas pressure relief slot (9) is the groove of leaving on the cylinder sleeve (12), most of circumferential inner wall of cylinder sleeve (12) still can with plunger (8) on sealed groove form the complete relative closure space that holds plunger case seal ring (11) so that plunger case seal ring (11) can not come off the groove from plunger (8).
In the implementation case, employing retracts cylinder (6) as mechanical stop, retract cylinder (6) and plunger case (7) is connected on the same plate, plunger case (7) retracts cylinder (6) and also reaches simultaneously extreme limit of travel and play mechanical stop effect (accompanying drawing 3) when reaching extreme limit of travel.Also can adopt for common oil hydraulic cylinder and to retract cylinder end cap (14) or other mechanical structure as backstop.
As shown in Figure 5, retract cylinder (6) by retracting cylinder piston rod (13), retract cylinder end cap (14), distance ring (15), retracting cylinder cylinder sleeve (16), retract cylinder piston (17) and form.Near plunger case stroke latter end, retract the corresponding position of cylinder (6) by calculating, and adjust the thickness retract distance ring (15) in the cylinder (6), so that plunger case (7) is when reaching extreme limit of travel, 4 retract cylinder (6) and also reach simultaneously extreme limit of travel.The end cap (14) that retracts like this cylinder (6) has stopped the motion that retracts cylinder piston (17) by distance ring (15), has also just stopped the motion of plunger case (7) piston simultaneously.Because four retract cylinder (6) and reach the limit of simultaneously, and active force is distributed on four angles of plunger case (7), so also just eliminated the deflection of plunger case (7), guaranteed that more plunger case seal ring (11) can not come off.
After the above improvement, the protective function that plunger case (7) self has had ultralimit.In field adjustable and the use; oil hydraulic cylinder begins pressure release when surpassing effective travel; pressure release flow between max die travel distance and maximum machine stroke becomes positive correlation with stroke; and in the maximum machine travel point; system has enough protective capabilities, does not damage plunger case seal ring (11) and plunger case (7).Because the angle of gas pressure relief slot (9) is less, and the orthodrome smooth transition.Even retract cylinder seal ring (11) slightly distortion under pressure, also can not damage.The plunger case seal ring (11) of distortion can be directed to prop drawing seal groove beyond the Great Wall when oil hydraulic cylinder fell after rise, and oil cylinder recovers normal operation at once.Can collect the oil drum from relief hole or the spiracle of this oil hydraulic cylinder from the plunger case oil spill.

Claims (2)

1. oil hydraulic cylinder, be comprised of end cap, cylinder body, piston rod, piston, seal ring, it is characterized in that: open gas pressure relief slot at inboard wall of cylinder block corresponding to the piston stroke terminal position, gas pressure relief slot is along the inboard wall of cylinder block circumference uniform distribution, gas pressure relief slot is valley gutter, and the bottom becomes 8~15 ° of angles with the cylinder body axis.
2. according to claim 1 oil hydraulic cylinder is characterized in that: make backstop with retracting cylinder at the piston stroke end.
CN 201320196465 2013-04-18 2013-04-18 Hydraulic cylinder Active CN203201900U (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN 201320196465 CN203201900U (en) 2013-04-18 2013-04-18 Hydraulic cylinder

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN 201320196465 CN203201900U (en) 2013-04-18 2013-04-18 Hydraulic cylinder

Publications (1)

Publication Number Publication Date
CN203201900U true CN203201900U (en) 2013-09-18

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Application Number Title Priority Date Filing Date
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Country Status (1)

Country Link
CN (1) CN203201900U (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103216486A (en) * 2013-04-18 2013-07-24 湖南华菱湘潭钢铁有限公司 Hydraulic cylinder
CN109667809A (en) * 2019-01-07 2019-04-23 煤炭科学技术研究院有限公司 A kind of piston type load cylinder with end of travel automatic protection functions

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103216486A (en) * 2013-04-18 2013-07-24 湖南华菱湘潭钢铁有限公司 Hydraulic cylinder
CN109667809A (en) * 2019-01-07 2019-04-23 煤炭科学技术研究院有限公司 A kind of piston type load cylinder with end of travel automatic protection functions

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