CN204493309U - 一种用于卡瓦互锁的液压系统 - Google Patents
一种用于卡瓦互锁的液压系统 Download PDFInfo
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Abstract
本实用新型涉及一种用于卡瓦互锁的液压系统，包括：液压缸A和液压缸B、锁止管路A、第一支路和第二支路、解锁管路A、解锁管路A上串接有液控单向阀A、锁止管路B，第三支路和第四支路、解锁管路B、解锁管路B上串接有液控单向阀B、第二支路与液控单向阀B的进油口连通，第四支路与液控单向阀A的进油口连通，手动三位四通阀A，手动三位四通阀A包括可将自身进油口与第一支路连通的第一工位，和可将自身进油口与解锁管路A连通的第二工位、三位四通阀B，手动三位四通阀B包括可将自身进油口与所述第三支路连通的第一工位，和可将自身进油口与解锁管路B连通的第二工位。该液压系统具有成本低、安全性高的优点。
Description
技术领域
本实用新型涉及不压井设备制造技术领域，特别涉及一种不压井设备中用于卡瓦互锁的液压系统。
背景技术
不压井技术目前在国内油田中的使用范围越来越大，其主要优点在于可以保护和维持地层的原始产能，减少酸化和压裂等增产措施的次数，为油气田的长期开发和稳定生产提供良好的基础。
所谓不压井技术具体是指在井内有压力的情况下不放喷、不压井进行强行作业的一种作业方法，主要用于油气井作业、注水井的检修等。
不压井设备中一般设置有承重卡瓦和下压卡瓦，其中承重卡瓦包括固定承重卡瓦和移动承重卡瓦，承重卡瓦在井下压力不足以抵消油管本身的重力时用于进行油管的起、下作业；下压卡瓦同样包括固定下压卡瓦和移动下压卡瓦，下压卡瓦在井下压力大于油管本身重力时用于进行油管的起、下作业。
现有的不压井设备中，两个承重卡瓦的互锁以及两个下压卡瓦的互锁均是依靠电控液的方法实现的，即通过电磁阀的作用来改变液体的流向，虽然该种方法能够满足承重卡瓦以及下压卡瓦中的互锁要求，但是需要采用防爆性能优越的电控阀以及电控元件，这就导致了设备成本高，并且依然存在有安全隐患。
因此，如何能够降低不压井设备的成本，并能够有效消除卡瓦互锁过程中的安全隐患是目前本领域技术人员亟需解决的技术问题。
实用新型内容
本实用新型的目的是提供一种用于卡瓦互锁的液压系统，以便能够在降低不压井设备成本的同时有效消除目前卡瓦互锁过程中所存在的安全隐患。
为解决上述技术问题，本实用新型提供的用于卡瓦互锁的液压系统，包括：
用于驱动固定承重卡瓦锁紧和张开的液压缸A；
用于驱动移动承重卡瓦锁紧和张开的液压缸B；
一端与所述液压缸A的锁紧腔连通的锁止管路A，且所述锁止管路A上还设置有第一支路和第二支路；
一端与所述液压缸A的解锁腔连通的解锁管路A，且所述解锁管路A上串接有液控单向阀A，由所述液压缸A流出至所述液控单向阀A的液压油可自由流通；
一端与所述液压缸B的锁紧腔连通的锁止管路B，且所述锁止管路B上还设置有第三支路和第四支路；
一端与所述液压缸B的解锁腔连通的解锁管路B，且所述解锁管路B上串接有液控单向阀B，由所述液压缸B流出至所述液控单向阀B的液压油可自由流通；
所述第二支路与所述液控单向阀B的进油口连通；
所述第四支路与所述液控单向阀A的进油口连通；
进油口与液压源连通，回油口与油箱连通，其余两口与所述第一支路和所述解锁管路A另一端连通的手动三位四通阀A，所述手动三位四通阀A包括可将自身进油口与所述第一支路连通的第一工位，和可将自身进油口与所述解锁管路A连通的第二工位；
进油口与所述液压源连通，回油口与所述油箱连通，其余两口与所述第三支路和所述解锁管路B另一端连通的手动三位四通阀B，所述手动三位四通阀B包括可将自身进油口与所述第三支路连通的第一工位，和可将自身进油口与所述解锁管路B连通的第二工位。
优选的，还包括与所述液压源连通的独立解锁管路，且所述第二支路与所述液控单向阀B之间还设置有手动二位三通阀A，所述手动二位三通阀A的三个口分别与所述第二支路、独立解锁管路以及所述液控单向阀B的进油口相连，所述手动二位三通阀A包括可将所述第二支路与所述液控单向阀B的进油口连通的第一工位，和可将所述独立解锁管路与所述液控单向阀B的进油口连通的第二工位；
所述第四支路与所述液控单向阀A之间还设置有手动二位三通阀B，所述手动二位三通阀B的三个口分别与所述第四支路、独立解锁管路以及所述液控单向阀A的进油口相连，所述手动二位三通阀B包括可将所述第四支路与所述液控单向阀A的进油口连通的第一工位，和可将所述独立解锁管路与所述液控单向阀A的进油口连通的第二工位。
优选的，还包括：
用于驱动固定下压卡瓦锁紧和张开的液压缸C；
用于驱动移动下压卡瓦锁紧和张开的液压缸D；
一端与所述液压缸C的锁紧腔连通的锁止管路C，且所述锁止管路C上还设置有第五支路和第六支路；
一端与所述液压缸C的解锁腔连通的解锁管路C，且所述解锁管路C上串接有液控单向阀C，由所述液压缸C流出至所述液控单向阀C的液压油可自由流通；
一端与所述液压缸D的锁紧腔连通的锁止管路D，且所述锁止管路D上还设置有第七支路和第八支路；
一端与所述液压缸D的解锁腔连通的解锁管路D，且所述解锁管路D上串接有液控单向阀D，由所述液压缸D流出至所述液控单向阀D的液压油可自由流通；
所述第六支路与所述液控单向阀D的进油口连通；
所述第八支路与所述液控单向阀C的进油口连通；
进油口与液压源连通，回油口与油箱连通，其余两口与所述第五支路和所述解锁管路C另一端连通的手动三位四通阀C，所述手动三位四通阀C包括可将自身进油口与所述第五支路连通的第一工位，和可将自身进油口与所述解锁管路C连通的第二工位；
进油口与所述液压源连通，回油口与所述油箱连通，其余两口与所述第七支路和所述解锁管路D另一端连通的手动三位四通阀D，所述手动三位四通阀D包括可将自身进油口与所述第七支路连通的第一工位，和可将自身进油口与所述解锁管路D连通的第二工位。
优选的，所述第六支路与所述液控单向阀D之间还设置有手动二位三通阀C，所述手动二位三通阀C的三个口分别与所述第六支路、独立解锁管路以及所述液控单向阀D的进油口相连，所述手动二位三通阀C包括可将所述第六支路与所述液控单向阀D的进油口连通的第一工位，和可将所述独立解锁管路与所述液控单向阀D的进油口连通的第二工位；
所述第八支路与所述液控单向阀C之间还设置有手动二位三通阀D，所述手动二位三通阀D的三个口分别与所述第八支路、独立解锁管路以及所述液控单向阀C的进油口相连，所述手动二位三通阀D包括可将所述第八支路与所述液控单向阀C的进油口连通的第一工位，和可将所述独立解锁管路与所述液控单向阀C的进油口连通的第二工位。
液压油由液压源进入手动三位四通阀A，此时手动三通四位阀A处于第二工位，液压油进入到解锁管路A中，由于解锁管路A上串接有液控单向阀A，并且液控单向阀A的进油口无供压，油液不能反向流通，所以固定承重卡瓦不能动作，仍旧处于锁紧状态；此时手动三位四通阀B处于第一工位，液压油进入到第三支路中，并通过第三支路进入到第四支路和锁止管路B中，进入到锁止管路B中的液压油将推动液压缸B进行锁紧，从而实现移动承重卡瓦进入锁紧状态，与此同时，进入到第四支路中的液压油将进入到液控单向阀A的进油口中，液控单向阀A的进油口有供压，解锁管路A中的液压油进入到液压缸A中实现液压缸A的解锁，从而使得固定承重卡瓦进入解锁状态，此时即可实现由移动承重卡瓦带动油管进行起、下管作业；当手动三位四通阀A处于第一工位，手动三位四通阀B处于第二工位时，能够实现固定承重卡瓦进入锁紧状态，同时移动承重卡瓦处于解锁状态，以便于移动承重卡瓦复位，从而为下一步的下管或起管做准备。
由此可见，本实用新型中所公开的液压系统可以使得一个卡瓦解锁时另外一个卡瓦处于锁紧状态，从而在完成起、下管作业的同时有效防止落管或者飞管的情况出现，同时由于在本实用新型所公开的液压系统中，液压油的流通路径的转换是通过手动三位四通阀A和手动三位四通阀B实现的，相对而言换向阀的防爆等级可以适度降低，与目前电控液的方式相比，显著降低了液压系统的成本，并且还消除了电控过程中所存在的安全隐患。
附图说明
图1为本实用新型实施例所提供的用于卡瓦互锁的液压系统的结构原理示意图。
其中，1为液压缸A，11为锁止管路A，12为第二支路，13为第一支路，14为解锁管路A，15为液控单向阀A，16为手动三位四通阀A，17为手动二位三通阀A，2为液压缸B，21为锁止管路B，22为第四支路，23为第三支路，24为解锁管路B，25为液控单向阀B，26为手动三位四通阀B，27为手动二位三通阀B，3为独立解锁管路，4为液压缸C，41为锁止管路C，42为第六支路，43为第五支路，44为解锁管路C，45为液控单向阀C，46为手动三位四通阀C，47为手动二位三通阀C，5为液压缸D，51为锁止管路D，52为第八支路，53为第七支路，54为解锁管路D，55为液控单向阀D，56为手动三位四通阀D，57为手动二位三通阀D，6为液压源，7为减压阀。
具体实施方式
本实用新型的核心是提供一种用于卡瓦互锁的液压系统，以便能够在降低不压井设备成本的同时有效消除目前卡瓦互锁过程中所存在的安全隐患。
为了使本技术领域的人员更好地理解本实用新型方案，下面结合附图和具体实施方式对本实用新型作进一步的详细说明。
请同时参考图1，图1为本实用新型实施例所提供的用于卡瓦互锁的液压系统的结构原理示意图。
本实用新型中所公开的液压系统，主要应用在不压井设备中，本领域技术人员熟知的是，在不压井设备中进行油管起、下作业时需要用到固定承重卡瓦、移动承重卡瓦；固定下压卡瓦以及移动下压卡瓦，其中固定承重卡瓦和移动承重卡瓦在井下压力不足以抵消油管自重的情况下配套使用，固定下压卡瓦和移动下压卡瓦在井下压力大于油管自重时配套使用，在本实施例中着重介绍用于驱动固定承重卡瓦和移动承重卡瓦的液压系统。
请参考图1，在该液压系统中包括：
用于驱动固定承重卡瓦锁紧和张开的液压缸A，用于驱动移动承重卡瓦锁紧和张开的液压缸B，液压缸A的锁紧腔(无杆腔)连通有锁止管路A，并且锁止管路A上还设置有第一支路和第二支路，液压缸A的解锁腔(有杆腔)连通有解锁管路A，并且解锁管路A上串接有液控单向阀A，由液压缸A流出至液控单向阀A的液压油可以自由流通；
液压缸B的锁紧腔(无杆腔)连通有锁止管路B，并且锁止管路B上还设置有第三支路和第四支路，液压缸B的解锁腔(有杆腔)连通有解锁管路B，并且解锁管路B上串接有液控单向阀B，由液压缸B流出至液控单向阀B的液压油可以自由流通；
其中第二支路与液控单向阀B的进油口连通，第四支路与液控单向阀A的进油口连通；
进油口与液压源连通，回油口与油箱连通，其余两口与第一支路和解锁管路A端部连通的手动三位四通阀A，手动三位四通阀A中包括可将自身进油口与第一支路连通的第一工位，和可将自身进油口与解锁管路A连通的第二工位；
进油口与液压源连通，回油口与油箱连通，其余两口与第三支路和解锁管路B端部连通的手动三位四通阀B，手动三位四通阀B中包括可将自身进油口与第三支路连通的第一工位，和可将自身进油口与解锁管路B连通的第二工位。
请参考图1，该系统实现固定承重卡瓦和移动承重卡瓦互锁的原理如下：
液压油由液压源进入手动三位四通阀A，此时手动三通四位阀A处于第二工位，液压油进入到解锁管路A中，由于解锁管路A上串接有液控单向阀A，并且液控单向阀A的进油口无供压，油液不能反向流通，所以液压缸A无动作，因而固定承重卡瓦也就不能动作，仍旧处于锁紧状态；此时手动三位四通阀B处于第一工位，液压油进入到第三支路中，并通过第三支路进入到第四支路和锁止管路B中，进入到锁止管路B中的液压油将推动液压缸B进行锁紧，从而实现移动承重卡瓦进入锁紧状态，与此同时，进入到第四支路中的液压油将进入到液控单向阀A的进油口中，液控单向阀A的进油口有供压，解锁管路A中的液压油进入到液压缸A中实现液压缸A的解锁，从而使得固定承重卡瓦进入解锁状态，此时即可实现由移动承重卡瓦带动油管进行起、下管作业；当手动三位四通阀A处于第一工位，手动三位四通阀B处于第二工位时，能够实现固定承重卡瓦进入锁紧状态，同时移动承重卡瓦处于解锁状态，以便于移动承重卡瓦复位，从而为下一步的下管或起管做准备。
可见，上述实施例中所公开的液压系统中可以使得固定承重卡瓦和移动承重卡瓦在配套使用的过程中，一个卡瓦解锁时另一个卡瓦处于可靠的锁紧状态，这就能够完成油管的起管、下管作业，同时还能够有效防止落管或者飞管的情况出现；另外由于上述实施例中所公开的液压系统中，液压油的流通路径的转换是通过手动三位四通阀A和手动三位四通阀B实现的，相对而言换向阀的防爆等级可以适度降低，与目前电控液的方式相比，显著降低了液压系统的成本，并且还消除了电控过程中所存在的安全隐患。
不难理解的是，第二支路、第四支路均可直接与液控单向阀B和液控单向阀A的进油口相连，为了进一步优化上述实施例中所公开的液压系统的功能，本实施例中在上述实施例的基础上，还设置了与液压源连通的独立解锁管路，并且第二支路与液控单向阀B之间还设置了手动二位三通阀A，手动二位三通阀A的三个口分别与第二支路、独立解锁管路以及液控单向阀B的进油口相连，并且手动二位三通阀A包括可将第二支路与液控单向阀B的进油口连通的第一工位，和可将独立解锁管路与液控单向阀B的进油口连通的第二工位；
同时第四支路与液控单向阀A之间还设置有手动二位三通阀B，手动二位三通阀B的三个口分别与第四支路、独立解锁管路以及液控单向阀A的进油口相连，手动二位三通阀B包括可将第四支路与液控单向阀A的进油口连通的第一工位，和可将独立解锁管路与所述液控单向阀A的进油口连通的第二工位。
在实际使用的过程中，手动二位三通阀B和手动二位三通阀A的常用工位为第一工位，而当手动二位三通阀B或手动二位三通阀A处于第二工位时，可以实现对液压缸A或者液压缸B的单独解锁。
用于驱动固定下压卡瓦和移动下压卡瓦的液压系统与上述实施例中所公开的液压系统相似，具体的，在上述实施例的基础之上，还设置了：
用于驱动固定下压卡瓦锁紧和张开的液压缸C；
用于驱动移动下压卡瓦锁紧和张开的液压缸D；
一端与液压缸C的锁紧腔连通的锁止管路C，且锁止管路C上还设置有第五支路和第六支路；
一端与液压缸C的解锁腔连通的解锁管路C，且解锁管路C上串接有液控单向阀C，由液压缸C流出至液控单向阀C的液压油可自由流通；
一端与液压缸D的锁紧腔连通的锁止管路D，且锁止管路D上还设置有第七支路和第八支路；
一端与液压缸D的解锁腔连通的解锁管路D，且解锁管路D上串接有液控单向阀D，由液压缸D流出至液控单向阀D的液压油可自由流通；
第六支路与液控单向阀D的进油口连通；
第八支路与液控单向阀C的进油口连通；
进油口与液压源连通，回油口与油箱连通，其余两口与第五支路和解锁管路C另一端连通的手动三位四通阀C，手动三位四通阀C包括可将自身进油口与第五支路连通的第一工位，和可将自身进油口与解锁管路C连通的第二工位；
进油口与液压源连通，回油口与油箱连通，其余两口与第七支路和解锁管路D另一端连通的手动三位四通阀D，手动三位四通阀D包括可将自身进油口与第七支路连通的第一工位，和可将自身进油口与所述解锁管路D连通的第二工位。
液压油由液压源进入手动三位四通阀C，此时手动三通四位阀C处于第二工位，液压油进入到解锁管路C中，由于解锁管路C上串接有液控单向阀C，并且液控单向阀C的进油口无供压，油液不能反向流通，所以液压缸C无动作，因而固定下压卡瓦也就不能动作，仍旧处于锁紧状态；此时手动三位四通阀D处于第一工位，液压油进入到第七支路中，并通过第七支路进入到第八支路和锁止管路D中，进入到锁止管路D中的液压油将推动液压缸D进行锁紧，从而实现移动下压卡瓦进入锁紧状态，与此同时，进入到第八支路中的液压油将进入到液控单向阀C的进油口中，液控单向阀C的进油口有供压，解锁管路C中的液压油进入到液压缸C中实现液压缸C的解锁，从而使得固定下压卡瓦进入解锁状态，此时即可实现由移动下压卡瓦带动油管进行起、下管作业；当手动三位四通阀C处于第一工位，手动三位四通阀D处于第二工位时，能够实现固定下压卡瓦进入锁紧状态，同时移动下压卡瓦处于解锁状态，以便于移动下压卡瓦复位，从而为下一步的下管或起管做准备。
请参考图1，上述实施例中的手动三位四通阀A、手动三位四通阀B、手动三位四通阀C以及手动三位四通阀D的进油口均与液压源连通，回油口均与邮箱连通，因而四个三位四通阀就形成了四联手动阀。
同样，第六支路、第八支路可以分别与液控单向阀D和液控单向阀C直接相连，为了进一步优化方案，本实施例中在上述实施例的基础之上还设置了：
位于第六支路与液控单向阀D之间的手动二位三通阀C，手动二位三通阀C的三个口分别与所述第六支路、独立解锁管路以及液控单向阀D的进油口相连，手动二位三通阀C包括可将第六支路与液控单向阀D的进油口连通的第一工位，和可将独立解锁管路与液控单向阀D的进油口连通的第二工位；
位于第八支路与液控单向阀C之间的手动二位三通阀D，手动二位三通阀D的三个口分别与第八支路、独立解锁管路以及液控单向阀C的进油口相连，手动二位三通阀D包括可将第八支路与液控单向阀C的进油口连通的第一工位，和可将独立解锁管路与液控单向阀C的进油口连通的第二工位。
在实际使用的过程中，手动二位三通阀D和手动二位三通阀C的常用工位为第一工位，而当手动二位三通阀D或手动二位三通阀C处于第二工位时，可以实现对液压缸C或者液压缸D的单独解锁。
如图1中所示，手动二位三通阀A、手动二位三通阀B、手动二位三通阀C以及手动二位三通阀D也形成了四联阀的形式，为了使得由液压源中流出的液压油处于合适的压力范围内，在靠近液压源的液压油管路上还设置了减压阀。
以上对本实用新型所提供的用于卡瓦互锁的液压系统进行了详细介绍。本文中应用了具体个例对本实用新型的原理及实施方式进行了阐述，以上实施例的说明只是用于帮助理解本实用新型的方法及其核心思想。应当指出，对于本技术领域的普通技术人员来说，在不脱离本实用新型原理的前提下，还可以对本实用新型进行若干改进和修饰，这些改进和修饰也落入本实用新型权利要求的保护范围内。
Claims (4)
1.一种用于卡瓦互锁的液压系统，其特征在于，包括：
用于驱动固定承重卡瓦锁紧和张开的液压缸A(1)；
用于驱动移动承重卡瓦锁紧和张开的液压缸B(2)；
一端与所述液压缸A(1)的锁紧腔连通的锁止管路A(11)，且所述锁止管路A(11)上还设置有第一支路(13)和第二支路(12)；
一端与所述液压缸A(1)的解锁腔连通的解锁管路A(14)，且所述解锁管路A(14)上串接有液控单向阀A(15)，由所述液压缸A(1)流出至所述液控单向阀A(15)的液压油可自由流通；
一端与所述液压缸B(2)的锁紧腔连通的锁止管路B(21)，且所述锁止管路B(21)上还设置有第三支路(23)和第四支路(22)；
一端与所述液压缸B(2)的解锁腔连通的解锁管路B(24)，且所述解锁管路B(24)上串接有液控单向阀B(25)，由所述液压缸B(2)流出至所述液控单向阀B(25)的液压油可自由流通；
所述第二支路(12)与所述液控单向阀B(25)的进油口连通；
所述第四支路(22)与所述液控单向阀A(15)的进油口连通；
进油口与液压源(6)连通，回油口与油箱连通，其余两口与所述第一支路(13)和所述解锁管路A(14)另一端连通的手动三位四通阀A(16)，所述手动三位四通阀A(16)包括可将自身进油口与所述第一支路(13)连通的第一工位，和可将自身进油口与所述解锁管路A(14)连通的第二工位；
进油口与所述液压源(6)连通，回油口与所述油箱连通，其余两口与所述第三支路(23)和所述解锁管路B(24)另一端连通的手动三位四通阀B(26)，所述手动三位四通阀B(26)包括可将自身进油口与所述第三支路(23)连通的第一工位，和可将自身进油口与所述解锁管路B(24)连通的第二工位。
2.根据权利要求1所述的用于卡瓦互锁的液压系统，其特征在于，还包括与所述液压源(6)连通的独立解锁管路(3)，且所述第二支路(12)与所述液控单向阀B(25)之间还设置有手动二位三通阀A(17)，所述手动二位三通阀A(17)的三个口分别与所述第二支路(12)、独立解锁管路(3)以及所述液控单向阀B(25)的进油口相连，所述手动二位三通阀A(17)包括可将所述第二支路(12)与所述液控单向阀B(25)的进油口连通的第一工位，和可将所述独立解锁管路(3)与所述液控单向阀B(25)的进油口连通的第二工位；
所述第四支路(22)与所述液控单向阀A(15)之间还设置有手动二位三通阀B(27)，所述手动二位三通阀B(27)的三个口分别与所述第四支路(22)、独立解锁管路(3)以及所述液控单向阀A(15)的进油口相连，所述手动二位三通阀B(27)包括可将所述第四支路(22)与所述液控单向阀A(15)的进油口连通的第一工位，和可将所述独立解锁管路(3)与所述液控单向阀A(15)的进油口连通的第二工位。
3.根据权利要求2所述的用于卡瓦互锁的液压系统，其特征在于，还包括：
用于驱动固定下压卡瓦锁紧和张开的液压缸C(4)；
用于驱动移动下压卡瓦锁紧和张开的液压缸D(5)；
一端与所述液压缸C(4)的锁紧腔连通的锁止管路C(41)，且所述锁止管路C(41)上还设置有第五支路(43)和第六支路(42)；
一端与所述液压缸C(4)的解锁腔连通的解锁管路C(44)，且所述解锁管路C(44)上串接有液控单向阀C(45)，由所述液压缸C(4)流出至所述液控单向阀C(45)的液压油可自由流通；
一端与所述液压缸D(5)的锁紧腔连通的锁止管路D(51)，且所述锁止管路D(51)上还设置有第七支路(53)和第八支路(52)；
一端与所述液压缸D(5)的解锁腔连通的解锁管路D(54)，且所述解锁管路D(54)上串接有液控单向阀D(55)，由所述液压缸D(5)流出至所述液控单向阀D(55)的液压油可自由流通；
所述第六支路(42)与所述液控单向阀D(55)的进油口连通；
所述第八支路(52)与所述液控单向阀C(45)的进油口连通；
进油口与液压源(6)连通，回油口与油箱连通，其余两口与所述第五支路(43)和所述解锁管路C(44)另一端连通的手动三位四通阀C(46)，所述手动三位四通阀C(46)包括可将自身进油口与所述第五支路(43)连通的第一工位，和可将自身进油口与所述解锁管路C(44)连通的第二工位；
进油口与所述液压源(6)连通，回油口与所述油箱连通，其余两口与所述第七支路(53)和所述解锁管路D(54)另一端连通的手动三位四通阀D(46)，所述手动三位四通阀D(46)包括可将自身进油口与所述第七支路(53)连通的第一工位，和可将自身进油口与所述解锁管路D(54)连通的第二工位。
4.根据权利要求3所述的用于卡瓦互锁的液压系统，其特征在于，所述第六支路(42)与所述液控单向阀D(55)之间还设置有手动二位三通阀C(47)，所述手动二位三通阀C(47)的三个口分别与所述第六支路(42)、独立解锁管路(3)以及所述液控单向阀D(55)的进油口相连，所述手动二位三通阀C(47)包括可将所述第六支路(42)与所述液控单向阀D(55)的进油口连通的第一工位，和可将所述独立解锁管路(3)与所述液控单向阀D(55)的进油口连通的第二工位；
所述第八支路(52)与所述液控单向阀C(45)之间还设置有手动二位三通阀D(57)，所述手动二位三通阀D(57)的三个口分别与所述第八支路(52)、独立解锁管路(3)以及所述液控单向阀C(45)的进油口相连，所述手动二位三通阀D(57)包括可将所述第八支路(52)与所述液控单向阀C(45)的进油口连通的第一工位，和可将所述独立解锁管路(3)与所述液控单向阀C(45)的进油口连通的第二工位。
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