CN106946192A - Fork truck lifting oil cylinder with New Buffering structure - Google Patents

Fork truck lifting oil cylinder with New Buffering structure Download PDF

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Publication number
CN106946192A
CN106946192A CN201710325552.3A CN201710325552A CN106946192A CN 106946192 A CN106946192 A CN 106946192A CN 201710325552 A CN201710325552 A CN 201710325552A CN 106946192 A CN106946192 A CN 106946192A
Authority
CN
China
Prior art keywords
cylinder
piston
oilhole
buffering
centre bore
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CN201710325552.3A
Other languages
Chinese (zh)
Inventor
钟继萍
徐龙
刘强强
王凤珠
张红霞
李志红
朱琼杰
郭晛
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.)
BENGBU HYDRAULIC MACHINERY CO LTD
Original Assignee
BENGBU HYDRAULIC MACHINERY CO LTD
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by BENGBU HYDRAULIC MACHINERY CO LTD filed Critical BENGBU HYDRAULIC MACHINERY CO LTD
Priority to CN201710325552.3A priority Critical patent/CN106946192A/en
Publication of CN106946192A publication Critical patent/CN106946192A/en
Pending legal-status Critical Current

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Classifications

    • BPERFORMING OPERATIONS; TRANSPORTING
    • B66HOISTING; LIFTING; HAULING
    • B66FHOISTING, LIFTING, HAULING OR PUSHING, NOT OTHERWISE PROVIDED FOR, e.g. DEVICES WHICH APPLY A LIFTING OR PUSHING FORCE DIRECTLY TO THE SURFACE OF A LOAD
    • B66F9/00Devices for lifting or lowering bulky or heavy goods for loading or unloading purposes
    • B66F9/06Devices for lifting or lowering bulky or heavy goods for loading or unloading purposes movable, with their loads, on wheels or the like, e.g. fork-lift trucks
    • B66F9/075Constructional features or details
    • B66F9/20Means for actuating or controlling masts, platforms, or forks
    • B66F9/22Hydraulic devices or systems
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15BSYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B15/00Fluid-actuated devices for displacing a member from one position to another; Gearing associated therewith
    • F15B15/08Characterised by the construction of the motor unit
    • F15B15/14Characterised by the construction of the motor unit of the straight-cylinder type
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15BSYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B15/00Fluid-actuated devices for displacing a member from one position to another; Gearing associated therewith
    • F15B15/08Characterised by the construction of the motor unit
    • F15B15/14Characterised by the construction of the motor unit of the straight-cylinder type
    • F15B15/1423Component parts; Constructional details

Abstract

The present invention discloses a kind of fork truck lifting oil cylinder with New Buffering structure, including cylinder body, cylinder body lower end is fixed with cylinder bottom, there is piston rod in cylinder body, piston-rod lower end is provided with piston, and cylinder bottom is provided with oilhole and centre bore, oilhole is communicated with centre bore, provided with buffering axle sleeve in centre bore, buffering axle sleeve one end is stretched into the central through hole of piston, there is gap between piston inner wall;Elongated hole and side oilhole are additionally provided with cylinder bottom, elongated hole is communicated with side oilhole and oilhole, the first check valve are provided with elongated hole, side oilhole is parallel with centre bore, and extends through the upper end of cylinder bottom.The present invention on cylinder bottom by setting elongated hole and side oilhole, fluid is set to be directly entered between piston and cylinder bottom, increase logical oily sectional area, reach the purpose of fast lifting, the first check valve is set in elongated hole again, make fluid can only gap oil return, play that falling is stable, the purpose of good buffer effect, effectively overcome the defect for the buffering effect difference that existing fork truck lifting oil cylinder is present.

Description

Fork truck lifting oil cylinder with New Buffering structure
Technical field
The present invention relates to a kind of lift oil tank, specifically it is a kind of apply on four-stage mast fork truck there is New Buffering knot The fork truck lifting oil cylinder of structure.
Background technology
At present, fork truck lifting oil cylinder species is various, has plunger case, also there is piston cylinder.Existing piston cylinder as shown in figure 1, Including cylinder body 101, the lower end of cylinder body 101, which is fixed with cylinder bottom 109, cylinder body 101, piston rod 102, and the lower end of piston rod 102 is provided with work There is cushion collar 103 in plug 112, the center counterbore of piston 112, have gap between cushion collar 103 and the inwall of piston 112;On cylinder bottom 109 It is provided with the first oilhole 108, the second oilhole 106, centre bore 110 and side oilhole 104, the first oilhole 108 and is provided with stop valve 107, First oilhole 108 is communicated with centre bore 110, the outlet obstruction of the second oilhole 106, the second oilhole 106 and centre bore 110 and side oil Hole 104 is communicated, and has steel ball 105 in the second oilhole 106, and side oilhole 104 is extended through in the upper end of cylinder bottom 109, centre bore 110 provided with slow Axle sleeve 111 is rushed, buffering axle sleeve 111 one end is stretched into the central through hole of cushion collar 103, has gap between cushion collar 103.Oil cylinder rises During liter, on the one hand fluid entered in the central through hole for buffering axle sleeve 111 by the first oilhole 108, then buffered axle sleeve 111 is with delaying Gap between punching set 103 and between cushion collar 103 and the inwall of piston 112 is flowed between piston 112 and cylinder bottom 109, the opposing party Face enters the second oilhole 106 by centre bore 110, then is directly entered by side oilhole 104 between piston 112 and cylinder bottom 109, reaches To the purpose of fast lifting;When oil cylinder declines, under the pressure of fluid, steel ball movement blocks the second oilhole 106, causes side oil Hole 104 is obstructed, and fluid can only be returned in fuel tank by the gap between buffering axle sleeve 111 and cushion collar 103, plays decline buffering Effect.The oil cylinder manufacture difficulty of this structure is big, strict cooperation is needed between the oilhole 106 of steel ball 105 and second, if steel ball 105 can not completely plugged second oilhole 106, fluid can largely effect on decline buffering effect through the oil return of side oilhole 104.
The content of the invention
In order to solve the problem of prior art is present, the present invention provides a kind of forklift lifting oil with New Buffering structure Cylinder, the oil cylinder increases logical oily sectional area, reaches working stability, the purpose of good buffer effect by setting side oilhole in cylinder bottom, Effectively overcome the defect for the buffering effect difference that existing lift oil tank is present.
The present invention is adopted the following technical scheme that:Under fork truck lifting oil cylinder with New Buffering structure, including cylinder body, cylinder body End, which is fixed with cylinder bottom, cylinder body, piston rod, and piston-rod lower end is provided with piston;Cylinder bottom be provided with oilhole and centre bore, oilhole with Centre bore is communicated, and provided with buffering axle sleeve in centre bore, buffering axle sleeve one end is stretched into the central through hole of piston, in piston There is gap between wall;Elongated hole and side oilhole are additionally provided with cylinder bottom, elongated hole connects side oilhole with oilhole, provided with the in elongated hole One check valve, side oilhole extends through the upper end of cylinder bottom.
The operation principle of the fork truck lifting oil cylinder with New Buffering structure of the present invention is:When oil cylinder raising, hydraulic pressure Oil enters piston from the oilhole of cylinder bottom enters the centre bore of buffering axle sleeve, then from the gap between buffering axle sleeve and piston inner wall Between cylinder bottom, piston raising is promoted, the first check valve is set due to being additionally provided with cylinder bottom in elongated hole and side oilhole, elongated hole, Because extraneous oil liquid pressure is more than oil cylinder inner fluid pressure, the first check valve is opened, and part fluid is also by elongated hole and side oil Hole is entered directly between piston and cylinder bottom, increases logical oily sectional area, and hydraulic oil circulates smoothly, and not only lifting velocity is fast, Can also avoid the occurrence of oil cylinder during the raising because operating pressure greatly caused by impact cause door frame and situation about shaking occur;Oil When cylinder falls after rise, the first closed check valve, the hydraulic oil between cylinder bottom and piston can only enter cylinder bottom from the centre bore of buffering axle sleeve Centre bore, and then discharged by the oilhole of cylinder bottom, the oil area of hydraulic oil reduces, and the fluid of piston is slowly saved Stream, and then the oil cylinder vibrations for avoiding piston slap cylinder bottom from causing, reach that raising is quick, fall stable purpose after rise.
Piston is provided with counterbore, and piston upper end is provided with passage, and passage is communicated with counterbore and rod chamber, set in counterbore There is the second check valve, because rod chamber is closed chamber, with the raising of oil cylinder, rod chamber volume is gradually reduced, gas in rod chamber Pressure gradually increases, and can apply a downward pressure to piston, if without pressure release, certainly will reduce oil cylinder lifting velocity, because This, can carry out pressure release, while the fluid of rodless cavity must also be prevented to enter rod chamber, therefore, on piston by passage Second check valve is set, and when rod chamber pressure is larger, the second check valve is opened, gas pressure in reduction rod chamber is ensureing oil The lifting velocity of oil cylinder is effectively improved on the basis of cylinder stationarity.
Having between piston and inboard wall of cylinder block on Glais ring sealing, the outer peripheral face of piston has support ring to coordinate with cylinder body.Under oil cylinder When dropping to buffering area, because oil area reduces rapidly, the increase of hydraulic fluid pressure moment, Glais ring and support ring can effectively hinder Only hydraulic oil improves the buffering effect of piston cylinder by entering between piston and inboard wall of cylinder block in rod chamber.
In summary, the fork truck lifting oil cylinder with New Buffering structure of the invention on cylinder bottom by setting elongated hole With the logical oily sectional area of side oilhole increase, the flow velocity of hydraulic oil is increased, prevents that oil cylinder from shaking during raising and decline, Ensure oil cylinder raising and the stationarity of decline.The setting of second check valve can also be on the basis of oil cylinder stationarity be ensured effectively Improve the lifting velocity of oil cylinder.
Brief description of the drawings
Fig. 1 is the schematic diagram of existing lower buffer lift oil cylinder.
Fig. 2 is the schematic diagram of fork truck lifting oil cylinder of the present invention with New Buffering structure.
Fig. 3 is the side view of the piston of fork truck lifting oil cylinder of the present invention with New Buffering structure.
Fig. 4 is the sectional view of the piston of fork truck lifting oil cylinder of the present invention with New Buffering structure.
Fig. 5 is the sectional view of the cylinder bottom of fork truck lifting oil cylinder of the present invention with New Buffering structure.
Embodiment
Embodiments of the invention are described specifically below in conjunction with the accompanying drawings:
Fork truck lifting oil cylinder with New Buffering structure, as shown in Fig. 2-Fig. 5, including cylinder body 201, the lower end of cylinder body 201 Being welded with cylinder bottom 208, cylinder body 201 has piston rod 215, and the lower end of piston rod 215 is provided with piston 214, piston 214 and cylinder body 201 There is Glais ring 213 to seal between inwall, there is support ring 212 to coordinate with cylinder body 201 on the outer peripheral face of piston 214.Open the lower end of piston 214 There is counterbore 204, the upper end of piston 214 is provided with passage 202, and passage 202 is communicated with counterbore 204 and rod chamber, is set in counterbore 204 There is the second check valve 205.Cylinder bottom 208 be provided with oilhole 207, centre bore 206, elongated hole 209 and side oilhole 211, oilhole 207 with Centre bore 206 is communicated, and elongated hole 209 connects side oilhole 211 with oilhole 207, and the first check valve 210 is provided with elongated hole 209, Side oilhole 211 extends through the upper end of cylinder bottom 208;Provided with buffering axle sleeve 203 in centre bore 206, work is stretched into buffering axle sleeve 203 one end In the central through hole for filling in 214 lower ends, there is gap between the inwall of piston 214.
During oil cylinder raising, the first check valve 210 is opened, and a part of fluid is directly entered from the oilhole 207 of cylinder bottom 208 In the centre bore of cylinder bottom 208, the centre bore of buffered axle sleeve 203 enter between buffering axle sleeve 203 and the inwall of piston 214 between clearance flow Enter between piston 214 and cylinder bottom 208, another part fluid passes through elongated hole 209 and side oilhole 211 from the oilhole 207 of cylinder bottom 208 It is directly entered between piston 214 and cylinder bottom 208, as the oil liquid pressure between piston 214 and cylinder bottom 208 increases, promotes oil cylinder Raising, due to increasing logical oily sectional area, makes fluid circulate more smooth, not only lifting velocity is fast, moreover it is possible to avoid the occurrence of oil cylinder Because operating pressure greatly caused by impact cause door frame and situation about shaking occur;And because rod chamber is closed chamber, with oil Gas pressure increases in the raising of cylinder, rod chamber, can apply a downward pressure, a raising speed for reduction oil cylinder to piston 214 Degree, the effect of the second check valve 208 is pressure release, makes the pressure in rod chamber by passage 202, the pressure release of the second check valve 205, Gas pressure in rod chamber is reduced, oil cylinder lifting velocity is improved, additionally it is possible to which preventing fluid counterbore 204 and passage 202 from entering has Rod cavity.When oil cylinder falls after rise, the first check valve 210 is closed, and the fluid between cylinder bottom 208 and piston 214 can only be from buffering axle sleeve 203 Gap oil return between piston 214, reaches purpose that is slow, steadily falling after rise.
Above-described is only one embodiment of the present invention.It should be pointed out that for one of ordinary skill in the art For, under the premise without departing from the principles of the invention, some variations and modifications can also be made, for example, change side oilhole and ventilation The position in hole etc., these also should be regarded as belonging to protection scope of the present invention.

Claims (3)

1. the fork truck lifting oil cylinder with New Buffering structure, including cylinder body, cylinder body lower end, which is fixed with cylinder bottom, cylinder body, piston Bar, piston-rod lower end is provided with piston;Cylinder bottom is provided with oilhole and centre bore, and oilhole is communicated with centre bore, provided with slow in centre bore Axle sleeve is rushed, buffering axle sleeve one end is stretched into the central through hole of piston, there is gap between piston inner wall, it is characterised in that:Cylinder Elongated hole and side oilhole are additionally provided with bottom, elongated hole connects side oilhole with oilhole, the first check valve, side oil are provided with elongated hole Hole extends through the upper end of cylinder bottom.
2. the fork truck lifting oil cylinder according to claim 1 with New Buffering structure, it is characterised in that:Piston is opened There is counterbore, piston upper end is provided with passage, and passage is communicated with counterbore and rod chamber, the second check valve is provided with counterbore.
3. the fork truck lifting oil cylinder according to claim 1 or 2 with New Buffering structure, it is characterised in that:Piston with Having between inboard wall of cylinder block on Glais ring sealing, the outer peripheral face of piston has support ring to coordinate with cylinder body.
CN201710325552.3A 2017-05-10 2017-05-10 Fork truck lifting oil cylinder with New Buffering structure Pending CN106946192A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201710325552.3A CN106946192A (en) 2017-05-10 2017-05-10 Fork truck lifting oil cylinder with New Buffering structure

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201710325552.3A CN106946192A (en) 2017-05-10 2017-05-10 Fork truck lifting oil cylinder with New Buffering structure

Publications (1)

Publication Number Publication Date
CN106946192A true CN106946192A (en) 2017-07-14

Family

ID=59478325

Family Applications (1)

Application Number Title Priority Date Filing Date
CN201710325552.3A Pending CN106946192A (en) 2017-05-10 2017-05-10 Fork truck lifting oil cylinder with New Buffering structure

Country Status (1)

Country Link
CN (1) CN106946192A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110683484A (en) * 2019-10-12 2020-01-14 武芳 Vibration damper for telescopic arm forklift

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110683484A (en) * 2019-10-12 2020-01-14 武芳 Vibration damper for telescopic arm forklift

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