阅读说明：本技术 负载敏感系统上的缓冲装置 (Buffer unit on load sensitive system ) 是由 胡建军 戚振红 赵鑫拓 吕德滨 张建军 何伟 于 2019-08-22 设计创作，主要内容包括：本发明公布一种负载敏感系统上的缓冲装置,属于负载敏感液压系统。补偿阀中补偿阀阀杆的两端分别是容腔E、容腔G；容腔E与主阀中主阀杆的前压力油连通；容腔G中安装有补偿阀阀芯弹簧；容腔G通过逻辑控制油路连接主阀中最大工作压力的工作油口；在补偿阀阀杆中开有连通容腔E、容腔G的长孔F、滑孔M；滑孔M与长孔F连通,滑孔M直径大于长孔F直径,滑孔M中滑动安装有浮动阻尼。本发明有效提高了补偿阀阀杆在负载反馈LS压力波动下的稳定性,降低LS波动下的流量变化,降低执行机构的冲击、振动,改善执行机构工作过程中操作的舒适性；同时,提高流通油液的稳定性,提高执行机构的安全性。(The present invention announces the buffer unit on a kind of load sensitive system, belongs to load-sensitive hydraulic system.The both ends of recuperation valve valve rod are cavity E, cavity G respectively in recuperation valve；Cavity E is connected to the preceding pressure oil of main valve stem in main valve；Recuperation valve valve core spring is installed in cavity G；The actuator port that cavity G passes through maximum working pressure (MWP) in logic control oil circuit connection main valve；Connection cavity E, the long hole F of cavity G, slide opening M are provided in recuperation valve valve rod；Slide opening M is connected to long hole F, and slide opening M diameter is greater than long hole F diameter, and floating damping is slidably fitted in slide opening M.The present invention effectively increases stability of the recuperation valve valve rod under load feedback LS pressure oscillation, reduces the changes in flow rate under LS fluctuation, reduces the shock and vibration of executing agency, improves the comfort operated in executing agency's course of work；Meanwhile the stability of circulation oil liquid is improved, improve the safety of executing agency.)

1. the buffer unit on a kind of load sensitive system, including main valve and recuperation valve；

It is characterized by:

The both ends of recuperation valve valve rod (2) are cavity E, cavity G respectively in the recuperation valve；The cavity E and main valve stem in main valve (4) preceding pressure oil connection；It is equipped in the cavity G recuperation valve valve core spring (7), recuperation valve valve core spring (7) is to compensation The power that valve valve rod (2) is moved to cavity E；The working oil that cavity G passes through maximum working pressure (MWP) in logic control oil circuit connection main valve Mouthful；

Be provided in the recuperation valve valve rod (2) connection cavity E, cavity G through oil duct；It is described to be leaned on through oil duct including one section The long hole F and one section of slide opening M close to cavity E of nearly cavity G；The slide opening M is connected to long hole F, and slide opening M diameter is greater than long hole F Diameter is slidably fitted with floating damping (3) in slide opening M.

2. the buffer unit on load sensitive system according to claim 1, it is characterised in that: the logic control oil circuit It is made of shuttle valve or check valve.

3. the buffer unit on load sensitive system according to claim 1, it is characterised in that: the main valve stem (4) is mended Valve valve rod (2) is repaid to be installed in main valve body (1)；Described main valve stem (4) one end is connected with main valve stem spring assembly (5)；It is described Actuator port is connected with connection block assembly (6) in main valve, and connection block assembly (6) is fixedly connected with main valve body (1).

4. the buffer unit on load sensitive system according to claim 3, it is characterised in that: the logic control oil circuit One end is connected to the actuator port of main valve, and the logic control oil circuit other end is connected to appearance by the oil duct H being provided on main valve body (1) Chamber G；The preceding pressure oil of main valve stem (4) passes to cavity E by the oil circuit K being provided on main valve body (1) in the main valve.

Technical field

A kind of buffer unit the present invention relates to load-sensitive hydraulic system, on specifically a kind of load sensitive system.

Background technique

Load sensing hydraulic control system is widely used in engineering machinery, and engineering machinery application environment compares Badly, operating condition is complicated, and uncontrollable factor is more；More stringent requirements are proposed for corresponding responsive to load hydraulic control system, especially It has the engineering machinery of requirements at the higher level in executing agency's course of work to the stability of executing agency, control precision, especially When engineering machinery meticulous process, there are strict requirements to vibration, the impact even flutter in executing agency's course of work.

The vibration of executing agency, certain hidden danger is caused to the safety of host, and the vibration of host is unfavorable for operation, control It makes and operational comfort is poor.Valve rod and the stabilization for compensating valve rod are to improve the premise of flow accuracy, are to reduce hydraulic shock, vibration Foundation stone.Valve rod is unstable causes to change by the flow of valve rod for valve rod or compensation, and the movement of executing agency is caused not assist Tune, stability are poor, control precision is low, bring hidden danger to the safety of hydraulic control system.

In order to solve the problems, such as the vibration in executing agency's course of work, impact, it is quick that Chinese patent discloses a kind of load Feel rotary buffering valve and hydraulic system of crane (CN107355437A)；It feeds back the Road of slewing directional control valve by LS Oil circuit is successively connect with the oil inlet of guide's hydraulic fluid port of three-way pressure compensating valve and permanent flow valve, the oil inlet of three-way pressure compensating valve It is connected to the oil inlet of valve body, the oil outlet of three-way pressure compensating valve is connected to the oil return opening of valve body, the oil outlet point of permanent flow valve It for two-way, is directly connect all the way with the oil return opening of valve body, another way while the oil inlet with the first check valve and second one-way valve Connection, three-way pressure compensating valve and slewing directional control valve form a speed governing valve, to realize two A mouthfuls of actuator ports, B mouthfuls of stream Amount is adjusted, and is exported flow in proportion, is not influenced by payload size.

This trimmer valve has following defect:

1, it is only applicable in crane rotation hydraulic load sensory system, using with limitation, does not have generality, is unfavorable for market It promotes；

2, controll plant described in patent is three-way pressure compensating valve, is only played regulatory role to system total flow, to single action It works as system, revolution buffering can only be solved；To more movement composite hydraulic system failures, application range is limited, can not Solve the problems, such as vibration caused by other operating conditions, impact, flutter.

Summary of the invention

In order to solve the above technical problems, the present invention provides the buffer unit on a kind of load sensitive system.

The invention is realized by the following technical scheme: the buffer unit on a kind of load sensitive system, including main valve and benefit Repay valve；The both ends of recuperation valve valve rod are cavity E, cavity G respectively in the recuperation valve；The cavity E and main valve stem in main valve Preceding pressure oil connection；Recuperation valve valve core spring is installed, recuperation valve valve core spring is to recuperation valve valve rod to cavity in the cavity G The power of E movement；The actuator port that cavity G passes through maximum working pressure (MWP) in logic control oil circuit connection main valve；In the recuperation valve Be provided in valve rod connection cavity E, cavity G through oil duct；The oil duct that runs through includes one section of long hole F and one close to cavity G Slide opening M of the section close to cavity E；The slide opening M is connected to long hole F, and slide opening M diameter is greater than long hole F diameter, slides peace in slide opening M It is damped equipped with floating.

It is further: the logic control oil circuit is made of shuttle valve or check valve.

The main valve stem, recuperation valve valve rod are installed in main valve body；Described main valve stem one end is connected with main valve stem spring Component；Actuator port is connected with connection block assembly in the main valve, and connection block assembly is fixedly connected with main valve body.

Logic control oil circuit one end is connected to the actuator port of main valve, and the logic control oil circuit other end is by being provided with master Oil duct H on valve body is connected to cavity G；The preceding pressure oil of main valve stem passes through the oil circuit K that is provided on main valve body in the main valve Pass to cavity E.

Recuperation valve valve rod the spring force of recuperation valve valve core spring, LS pressure (in main valve in actuator port A mouthfuls, B mouthfuls most Big operating pressure) and main valve stem before pressure (abbreviation upstream pressure) effect is lower is in equilibrium state；

Damping float under upstream pressure effect, keeps recuperation valve valve rod pressure at two ends obstructed mutually, it is ensured that recuperation valve valve rod both ends Pressure is independent of each other and guarantees that recuperation valve valve rod pressure at two ends difference is certain value, in pressure difference and the stable situation of valve rod sectional area Under, it ensure that the stability and actuating mechanism controls precision of executing agency's flow；

When A mouthfuls or B mouthfuls of actuator port are caused load feedback pressure LS to increase suddenly by operating conditions such as external impact, cause to feed back To the LS pressure increase of recuperation valve valve rod spring cavity (cavity G), when load feedback pressure LS is greater than upstream pressure, LS pressure warp Long hole F opens floating damping to the non-spring cavity (cavity E) of recuperation valve valve rod, recuperation valve valve rod both ends cavity on overcompensation valve valve rod It communicates, one has been decayed influence of the recuperation valve valve rod spring cavity LS pressure to recuperation valve valve rod；Secondly reducing LS pressure jump And lead to the flutter of recuperation valve valve rod；Thirdly increasing the stability of recuperation valve valve rod, flow control accuracy is improved.

Compared with prior art, the beneficial effects of the present invention are:

Structure is simple, easy to process, it is easy to accomplish；Under the premise of not changing former recuperation valve valve rod function, performance, sufficiently combine The design feature of recuperation valve valve rod realizes one-way throttle on recuperation valve valve rod, is suitable for all valve precompensation valve valve rods, realizes Valve precompensation valve valve rod all standing；Stability of the recuperation valve valve rod under load feedback LS pressure oscillation is effectively improved, LS is reduced Changes in flow rate under fluctuation reduces the shock and vibration of executing agency, improves the comfort operated in executing agency's course of work； Meanwhile the stability of circulation oil liquid is improved, improve the safety of executing agency.

Detailed description of the invention

Fig. 1 is schematic structural view of the invention；

Fig. 2 is recuperation valve stem structure schematic diagram in Fig. 1；

Fig. 3 is hydraulic schematic diagram of the present invention；

In figure: 1, main valve body；2, recuperation valve valve rod；3, it floats and damps；4, main valve stem；5, main valve stem spring assembly；6, link block Component；7, recuperation valve valve core spring.

Specific embodiment

It is a specific embodiment of the invention below, the present invention will be further described with reference to the accompanying drawings.

In conjunction with shown in Fig. 1 to Fig. 3, a kind of buffer unit on load sensitive system, recuperation valve is integrated in the main valve of main valve In body 1.4 one end of main valve stem is connected with main valve stem spring assembly 5；Actuator port is connected with connection block assembly 6, link block in main valve Component 6 is fixedly connected with main valve body 1.

Recuperation valve valve rod 2 is mounted in main valve body 1, and the both ends of recuperation valve valve rod 2 are cavity E, cavity G respectively, in cavity G Recuperation valve valve core spring 7, the power that recuperation valve valve core spring 7 gives recuperation valve valve rod 2 to move to cavity E are installed.Main valve in main valve The preceding pressure oil of bar 4 passes to cavity E by the oil circuit K being provided on main valve body 1.Actuator port in main valve connects logic control Oil circuit, the logic control oil circuit other end are connected to cavity G by the oil duct H being provided on main valve body 1.Logic control oil circuit is by shuttle The actuator port of maximum working pressure (MWP) in main valve can be connected to cavity G by valve or check valve composition, logic control oil circuit.

Be provided in recuperation valve valve rod 2 connection cavity E, cavity G through oil duct.It include one section close to cavity through oil duct The long hole F of G and one section of slide opening M close to cavity E；Slide opening M is connected to long hole F, and slide opening M diameter is greater than long hole F diameter, slide opening M In be slidably installed floating damping 3.

Working principle:

1, after main valve stem 4 commutates, the logic control oil circuit that A, B mouthfuls of pressure are formed through check valve selects A, B mouthfuls of maximum loads Pressure is as load feedback pressure LS, cavity G of the load feedback pressure LS through 1 internal galleries H of main valve body to recuperation valve valve rod 2；

Oil circuit K to cavity E on the compensated valve valve rod 2 of upstream pressure；

Recuperation valve valve rod keeps balance under the elastic force effect of upstream pressure, load feedback pressure LS and recuperation valve valve core spring 7 State, i.e. stable state；

Damping 3 of floating at this time acts on the end face of long hole F under cavity E pressure (upstream pressure) effect, because of the work for damping 3 of floating With cavity E, the G at recuperation valve valve rod both ends are independent of each other by pressure mutually isolated, between two chambers under such operating condition.Load is anti- The stabilization of feed voltage power LS ensure that recuperation valve valve rod in the stabilization of spool hole site, and the stabilization of recuperation valve valve rod improves execution machine The stability of structure flow and the control precision of flow.

2, after 4 commutation work of main valve stem, maximum load hydraulic fluid port is led to maximum load hydraulic fluid port pressure LS by external impact It instantaneously sharply increases, the logic control oil circuit that the load feedback LS pressure after raising is formed through check valve to recuperation valve valve rod cavity G acts on recuperation valve valve rod spring cavity；

Situation one: when the thrust that spring force and cavity G pressure act on the generation of recuperation valve valve rod is acted on less than cavity E upstream pressure Recuperation valve valve rod is in stable state under the thrust that recuperation valve valve rod generates, such operating condition, and recuperation valve valve rod will not be because of load It is unstable caused by the fluctuation of feedback LS pressure；

Situation two: when cavity G pressure is greater than cavity E upstream pressure, cavity G pressure is made by the long hole F on recuperation valve valve rod For damping 3 of floating, damping of floating opens two cavity channel of recuperation valve valve rod at cavity G and the effect of cavity E pressure, makes cavity The load feedback LS pressure of G decays rapidly, and fast and stable is because of recuperation valve valve rod caused by load feedback LS pressure change dramatically Fluctuation, and then achieve the purpose that stable recuperation valve valve rod flow, it is led to reduce executing agency because of external loading change dramatically Vibration, the impact of cause.

Above-described embodiment can be seen that the present invention using floating Damped Structures, be effectively improved load-sensitive hydraulic pressure system LS signal unite to the impact of compensation valve rod and the response of improvement system；The stability for increasing recuperation valve valve rod reduces execution Mechanism because external factor interference caused by vibration, impact, improve operability in executing agency's course of work, comfortable Property, the safety of hydraulic system is improved, the service life of hydraulic system is improved.It is negative that the present invention is applicable not only to engineering machinery Sensitive hydraulic control system is carried, the control mechanism of the load-sensitive hydraulic system of other industry is also applied for.According to engineering machinery The characteristics of and different operating condition requirement, settable difference floating damping structure parameters are sensitive to meet different engineering machinery loads Demand of the hydraulic system to different operating conditions.