CN2292929Y

CN2292929Y - Buffer of plunger oil cylinder for concrete pump

Info

Publication number: CN2292929Y
Application number: CN 96224468
Authority: CN
Inventors: 刘权
Original assignee: CHANGSHA CONSTRUCTION MACHINER
Current assignee: Changsha Zoomlion Heavy Industry Science and Technology Development Co Ltd
Priority date: 1996-08-23
Filing date: 1996-08-23
Publication date: 1998-09-30
Anticipated expiration: 2006-08-23

Abstract

The utility model relates to a concrete pump, which is a novel buffer of a plunger oil cylinder for a concrete pump. The utility model is characterized in that the inner cavity of a piston (1) is provided with a small piston (5); the displacement of the small piston (5) is controlled by a return spring (3) and a limited check ring (7). the washover of the buffer oil pocket (4), a small throttling hole path (6), a small piston (5) are relevant to the interval of the inner cavity. The tail end of the plunger (1) is provided with a new shape and a new function. The utility model has the advantages of reasonable structure, reliable buffering, vibration damping, noise reduction, the long service life of a plunger cylinder.

Description

The concrete pump damping device of piston type cylinder

The utility model relates to concrete pump, and particularly the piston type cylinder of concrete pump is applied to the concrete pump distribution system.

The concrete pump distribution system be by a pair of piston type cylinder alternating action in the swing rocking arm, O.2-0.3 second this process is finished in usually because the time is short, oil pressure is high, therefore impact and noise very serious.General plunger tail commonly used reserves buffering oil pocket A and boss B (as shown in Figure 3) is made in the plunger case bottom, though can play buffer function, because the gap is bigger between plunger case and the plunger, and boss and buffering oil pocket gap are difficult to grasp.Therefore, its cushioning effect is not good, and plunger tail and cylinder bottom impingement phenomenon still happen occasionally, even plunger tail bump boss takes place, and causes piston type cylinder to damage.

The purpose of this utility model provides a kind of can reliably the buffering, prevents that plunger from impacting cylinder bottom, reaches the piston type cylinder of vibration and noise reducing.

Invention main points of the present utility model are that a small piston is installed in plunger, between plunger and small piston top, be pressed into return spring, and make small piston spacing with spacing back-up ring, with the plunger tail outside make tilted conical surface, toroidal surface is made in the inboard, cross sulculus etc. is left in the bottom.

Accompanying drawing 1 is the utility model structural representation;

Accompanying drawing 2 is the utility model function situation schematic representation;

Accompanying drawing 3 is a kind of prior art constructions schematic representation.

Among the figure: [1] is plunger, and [2] are plunger case, and [3] are return spring, and [4] are the buffering oil pocket, and [5] are small piston, and [6] are throttling pore (road), and [7] are spacing back-up ring, and [8] are the plunger male cone (strobilus masculinus), and [9] are the plunger inner ring surface, and [10] are cross (oil) groove.

Now be summarized as follows in conjunction with the accompanying drawings:

Small piston [5] plunger [1] inner chamber of packing into, the top of small piston [5] is pressed into return spring [3], constitutes buffering oil pocket [4].Plunger [1] inner chamber is packed into behind the small piston [5], imbeds spacing back-up ring [7], the displacement of restriction small piston [5].Small piston [5] center is drilled with throttling pore (road) [6].Plunger [1] afterbody makes male cone (strobilus masculinus) [8], inner ring surface [9]; Have cross (oil) groove [10] draining on plunger [1] end face.In the work, plunger [1] afterbody is during also near plunger case [2] bottom, and small piston [5] is pushed out [1] one section of plunger to limited back-up ring [7] and blocks under the elastic force effect of return spring [3].At this moment, the bottom of small piston [5] is cushioned oil pocket [4] near plunger case [2] bottom and form one at the top.Oil in the buffering oil pocket [4] is to enter by the gap between throttling pore (road) [6] and plunger [1] inner chamber and the small piston [5].When plunger [1] when being forced to withdraw, plunger case [2] bottom is pushed up in small piston [5] rear end, and when plunger [1] continued withdrawal, then plunger [1] fluid and the return spring [3] that will be cushioned in the oil pocket [4] blocked.Because compole is short during withdrawal, the oil of buffering oil pocket [4] can not release from gap between throttling pore (road) [6] and small piston [5] and plunger [1] inner chamber unobstructedly, thereby reaches the buffering before plunger [1] withdrawal puts in place and avoid plunger [1] afterbody and the purpose of plunger case [2] bottom impact.Its buffer level can be regulated by the size of throttling pore (road) [6] diameter and the gap between small piston [5] and plunger [1] inner chamber.

After plunger [1] contacts bottom plunger case [2], need plunger [1] when pushing back, the spy is processed into male cone (strobilus masculinus) [8] with plunger [1] afterbody, inner ring surface [9] and cross (oil) groove [10], accept the compression area of high pressure oil with increase, push back the suffered thrust of moment plunger [1] thereby strengthen.

The utlity model has rational in infrastructure, advantages such as buffering is reliable, vibration and noise reducing, plunger case [2] long working life.

Claims

1, a kind of concrete pump relates to the concrete pump distribution system with the damping device of piston type cylinder, comprises plunger [1], plunger case [2], and feature of the present utility model is:

I〉plunger [1] inner chamber is equipped with small piston [5], and small piston [5] center is drilled with throttling pore (road) [6], is pressed into return spring [3] between plunger [1] and small piston [5] top;

Ii〉plunger [1] inner chamber has the groove that can embed spacing back-up ring [7], is the conical surface outside plunger [1] afterbody, and the inboard is an anchor ring, and the bottom has cross (oil) groove [10].

2,, it is characterized in that the big I of the throttling pore (road) [6] at small piston [5] center changes by the described damping device of claim 1.

3,, it is characterized in that the adjustable gaps joint between small piston [5] and plunger [1] inner chamber by the described damping device of claim 1.