CN201621130U

CN201621130U - Single-acting piston type buffering hydraulic oil cylinder

Info

Publication number: CN201621130U
Application number: CN2010201239553U
Authority: CN
Inventors: 王军; 杨浩; 汤英娇
Original assignee: HEFEI LIHENG TECHNOLOGY Co Ltd
Current assignee: Hefei Liheng Hydraulic System Co., Ltd.
Priority date: 2010-03-04
Filing date: 2010-03-04
Publication date: 2010-11-03
Anticipated expiration: 2020-03-04

Abstract

The utility model discloses a single-acting piston type buffering hydraulic oil cylinder comprising a cylinder body, a piston and a plunger rod, wherein the lower part of the cylinder body is a cylinder bottom; an oil chamber is arranged between the cylinder bottom and the piston; an oil port passes through from the cylinder bottom and is communicated with the oil chamber; a hollow plunger extending towards the interior of the oil chamber is arranged at the center of the cylinder bottom in an integrated way; in addition, the bottom of the piston is provided with a blind hole which allows the plunger to be inserted in; the body of the plunger is provided with a plurality of radial holes; and the radial holes are communicated with the oil chamber and the oil port. The oil cylinder avoids the impact of the piston body on the cylinder bottom, and simultaneously avoids shudder caused by the intense collision of a secondary dodge gate frame and a primary fixed gate frame, thus ensuring the strength and the smooth working of the hydraulic oil cylinder and a whole hydraulic system of a forklift.

Description

Single-acting piston type buffering hydraulic oil cylinder

Technical field:

The utility model relates to a kind of oil cylinder, specifically a kind of single-acting piston type buffering hydraulic oil cylinder.

Background technique:

It is the single-acting plunger type oil hydraulic cylinder that present fork truck two-stage door frame freely promotes main lift oil tank, in conjunction with Fig. 1, oil cylinder comprises cylinder body 1, plunger rod 2, piston 3, we hoist the oil hydraulic cylinder process that hoists plunger rod 2 process of stretching out hereinafter to be referred as oil cylinder, the process that plunger rod is withdrawn into cylinder body descends hereinafter to be referred as oil cylinder oil hydraulic cylinder decline process.In conjunction with Fig. 2, it is to realize like this that oil cylinder hoists, hydraulic oil enters in the oil pocket 6 from the hydraulic fluid port 5 of cylinder bottom 4, by pressure with piston 3 and plunger rod 2 jack-up, as shown in Figure 1, when piston 3 descends, at plunger rod, descend with certain acceleration under the action of gravity of door frame and goods, near cylinder base the time with the speed of about 400mm/s and inertia impact cylinder bottom greatly, piston and oil cylinder cylinder bottom, movable door frame of secondary and one-level fixedly door frame can produce strong bump, and cause that fork truck trembles, will inevitably have a strong impact on the intensity and the proper functioning of hydraulic jack and whole hydraulic system.

The model utility content:

For overcoming the defective of prior art, the purpose of this utility model is to provide a kind of single-acting piston type buffering hydraulic oil cylinder, can slow down the impact of piston to cylinder bottom, plays the effect of bumper and absorbing shock, has improved the reliability of hydraulic jack.

The utility model technical solution problem adopts following technological scheme:

Single-acting piston type buffering hydraulic oil cylinder, comprise cylinder body, the piston that can in cylinder body, move reciprocatingly and the plunger rod that forms a fixed connection and be synchronized with the movement with described piston, the bottom of cylinder body is a cylinder bottom, be made as oil pocket between cylinder bottom and the piston, hydraulic fluid port connects from cylinder bottom and is communicated with described oil pocket, the plunger of the hollow of extending in described oil pocket is set in the center of described cylinder bottom integral type, and the blind hole that allows described plunger to insert is set in the bottom of described piston, offer a plurality of radial holes on plunger body, described radial hole and described oil pocket and described hydraulic fluid port connect.

Structural feature of the present utility model also is:

Described a plurality of radial hole is axially equidistantly arranged along described plunger, and the aperture of a plurality of radial holes is and reduces trend from top to bottom.

The lower inner wall of described blind hole is provided with seal ring, and in the time of in described plunger inserts blind hole, described seal ring forms sealing between plunger outer wall and blind hole inwall.

Compared with the prior art, the beneficial effects of the utility model are embodied in:

The utility model is provided with in the center of cylinder bottom integral type and extends plunger in oil pocket, when piston and plunger rod finished promote action after, when piston is descending rapidly, in the oil pocket hydraulic oil from the inner chamber of hollow plunger to the hydraulic fluid port oil return, when plunger inserts in the blind hole of piston, shutoff the plunger head center hole, make the interior hydraulic oil of oil pocket to flow to hydraulic fluid port through plunger cavity and carry out oil return from the radial hole (throttle orifice) of plunger, oil in the oil pocket forms the immense pressure opposing impact force that descent of piston produced like this, the speed of descent of piston is slowed down gradually, play good buffer function.The aperture of the radial hole of offering on the plunger (throttle orifice) diminishes from top to bottom gradually, piston at first seals radial hole topmost, make that the oil return speed of oil pocket is slack-off, enclosed radical hole one by one from top to bottom again, and more down radial hole is more little, that is to say, piston is descending, the speed of oil return is slow more in the oil pocket, finish secondary, three grades, multi-buffer has guaranteed that piston is smooth-going, the impact of piston body to cylinder bottom avoided in the falling of decrease of speed formula, avoided simultaneously the movable door frame of secondary and one-level fixedly door frame guaranteed the intensity and the smooth working of fork truck hydraulic jack and whole hydraulic system because of clashing into trembling of causing strongly.

Description of drawings:

Fig. 1 is the structural representation (wherein piston is in the falling state) of existing oil cylinder; Fig. 2 is the structural representation (wherein piston is the lifting state) of existing oil cylinder; Fig. 3 is the structural representation (wherein piston is the lifting state) of the utility model oil cylinder; Fig. 4 is the structural representation (wherein piston is in the falling state) of the utility model oil cylinder.

Number in the figure: 1 cylinder body, 2 plunger rods, 3 pistons, 4 cylinder bottoms, 5 hydraulic fluid ports, 6 oil pockets, 7 plungers, 8 blind holes, 9 radial holes, 10 seal rings.

Below pass through embodiment, and the utility model is described in further detail in conjunction with the accompanying drawings.

Embodiment:

Embodiment: in conjunction with Fig. 3,4, the piston type buffering hydraulic oil cylinder of present embodiment, comprise cylinder body 1, piston 3, plunger rod 2 is connected the upper end of piston 3 to drive external agency's motion, hydraulic oil enters in the oil pocket 6 from the hydraulic fluid port 5 of cylinder bottom 4, it is up that generation pressure orders about piston 3, finish and promote action, after lifting work is finished, shown in Figure 4, pallet fork externally, under the action of gravity of door frame and plunger rod etc., piston 3 is descending rapidly in cylinder body 1, hydraulic oil in the oil pocket 6 refluxes to hydraulic fluid port 5 through its inner chamber rapidly from the plunger base center hole, the plunger head center hole that inserted after the blind hole 8 of piston just shutoff when the top of plunger 7, hydraulic oil in the oil pocket 6 can only flow to hydraulic fluid port 5 from the radial hole 9 of plunger, the rising of oil pocket internal pressure forms the reaction force to piston 3, make piston 3 deceleration buffers, continue when descending at piston, just seal the radial hole 9 on the plunger 7 one by one, make the oil return speed of oil pocket 6 slack-off gradually, the reaction force that the piston lower end produces is also increasing gradually, rate of descent is progressively slack-off, play infinite variable speed cushioning effect, eliminated the impact of piston to cylinder bottom, also avoided the movable door frame of secondary and one-level fixedly door frame improved the reliability of hydraulic jack because of clashing into trembling of causing strongly.

Claims

1. single-acting piston type buffering hydraulic oil cylinder, comprise cylinder body (1), piston that can in cylinder body, move reciprocatingly (3) and the plunger rod (2) that forms a fixed connection and be synchronized with the movement with described piston, the bottom of cylinder body is cylinder bottom (4), be made as oil pocket (6) between cylinder bottom and the piston, hydraulic fluid port (5) connects from cylinder bottom and is communicated with described oil pocket, it is characterized in that, the plunger (7) of the hollow of extending in described oil pocket (6) is set in the center integral type of described cylinder bottom (4), and the blind hole (8) that allows described plunger (7) to insert is set in the bottom of described piston (3), offer a plurality of radial holes (9) on plunger body, described radial hole and described oil pocket (6) and described hydraulic fluid port (5) connect.

2. single-acting piston type buffering hydraulic oil cylinder according to claim 1 is characterized in that, described a plurality of radial holes (9) are axially equidistantly arranged along described plunger (7), and the aperture of a plurality of radial holes is and reduces trend from top to bottom.

3. single-acting piston type buffering hydraulic oil cylinder according to claim 1, it is characterized in that, the lower inner wall of described blind hole (8) is provided with seal ring (10), and in the time of in described plunger (7) inserts blind hole (8), described seal ring (10) forms sealing between plunger outer wall and blind hole inwall.