The utility model discloses a cylinder pre discharge valve group, which comprises a cartridge valve, a speed regulating valve and a electromagnetic reversing valve. The speed regulating valve is composed of a constant differential pressure reducing valve and a throttle valve. The cartridge valve has a / B / C interface, the cartridge valve interface a is connected with one end of the constant differential pressure reducing valve through a pipeline, and the cartridge valve interface B is respectively connected with the other end of the speed regulating valve and one end of the electromagnetic reversing valve through a pipeline The port C of the cartridge valve is connected with the other end of the differential pressure reducing valve and the electromagnetic directional valve through the pipeline, and the other end of the electromagnetic directional valve is connected with the differential pressure reducing valve. With the opening of the pressure reducing valve in the speed regulating valve becoming larger, the pressure reducing valve enters the normal differential pressure reducing installation state, and the flow through the speed regulating valve enters the stable state, and the opening speed of the cartridge valve core is also stable When the valve is stable, the opening speed of the cartridge can be controlled by adjusting the flow of the governor valve, so as to achieve the function of controlling the pre discharge speed.
【技术实现步骤摘要】
一种油缸预泄阀组
本技术涉及液压机
,具体为一种油缸预泄阀组。
技术介绍
大型液压机在工作时,油缸内储存了很大压缩能,回程前必需先将油缸压力降低到一定程度,否则回程时将产生巨大的震动及噪音,甚至会使油管破裂造成事故。在回程前将油缸压力降低到一定程度的过程称为预泄,用于完成预泄动作的阀称为预泄阀。单就预泄而言动作并不困难,只有在有严格的快速性要求时才显得困难。对预泄速度要求不高的场合,采用,小通径阀换向阀、节流阀、等完成预泄就能满足工艺要求,而且具有结构简单的优点。但对预泄要求高的场合,例如大型的锻造液压机其油缸径大、行程长、动作快、所以要求预泄速度非常快,在这类液压机预泄时的瞬间流量在数千/升至数万升/分,远比供油流量大。由于上面预泄动作所选用的预泄阀都是横过流截面的泄流通道,在油缸压力较高的时段其泄压速度较快,在压较低时段泄压速度变得很慢,预泄流量变化很大,很难满足快速和平稳的要求。即便采用伺服阀或比例阀预泄,由于预泄动作时间非常短这些阀基本工作在超调的过渡工作段,无法做出正确响应而且成本过高。
技术实现思路
本技术的目的在于提供一种油缸预泄阀组,以解决上述
技术介绍
中提出的问题。为实现上述目的,本技术提供如下技术方案:一种油缸预泄阀组,包括插装阀、调速阀、电磁换向阀,所述调速阀由定差减压阀和节流阀组成,所述插装阀具有A/B/C个接口,所述插装阀接口A通过管道与定差减压阀一端相连通,所述插装阀接口B通过管道分别与调速阀另一端接口和电磁换向阀一端相连通,所述插装阀接 ...
【技术保护点】
1.一种油缸预泄阀组,其特征在于:包括插装阀(1)、调速阀(2)、电磁换向阀(3),所述调速阀(2)由定差减压阀(4)和节流阀(5)组成,所述插装阀(1)具有A/B/C3个接口,所述插装阀(1)接口A通过管道与定差减压阀(4)一端相连通,所述插装阀(1)接口B通过管道分别与调速阀(2)另一端接口和电磁换向阀(3)一端相连通,所述插装阀(1)接口C通过管道与定差减压阀(4)和电磁换向阀(3)另一端相连通,所述电磁换向阀(3)另一端与定差减压阀(4)相连通。/n
【技术特征摘要】
1.一种油缸预泄阀组,其特征在于:包括插装阀(1)、调速阀(2)、电磁换向阀(3),所述调速阀(2)由定差减压阀(4)和节流阀(5)组成,所述插装阀(1)具有A/B/C3个接口,所述插装阀(1)接口A通过管道与定差减压阀(4)一端相连通,所述插装阀(1)接口B通过管道分别与调速阀(2)另...
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