CN209387358U - 天然气自动控制连续取样系统 - Google Patents
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Abstract
本实用新型属于天然气检测技术领域,具体地涉及一种天然气自动控制连续取样系统,包括与天然气管道连接的取样探针和减压阀,所述的减压阀的进口与取样探针的出口相连接,减压阀的出口由管道分为两路,其中一路与气动隔膜采样泵连接,另一路通过管道分别与第一恒压取样钢瓶和第二恒压取样钢瓶的出口端相连接,还包括全自动天然气置换系统。本实用新型能够实现连续取样。由于每隔一段时间取样一次直至恒压取样钢瓶装满,所以取样气体完全能够代表整个生产周期内的流体介质,具有代表性。
Description
技术领域
本实用新型属于天然气检测技术领域,具体地涉及一种天然气自动控制连续取样系统。
背景技术
天然气成分的确定能够为气体贸易交接、流量计量等提供有力保证。而天然气组成的测定的准确性很大程度上取决于取样技术。传统的取样系统是将管道内的天然气经过取样探针取样,然后经过减压阀减压后,用取样钢瓶把管道内的天然气收集起来,然后去实验室化验检测。因为传统的取样系统,取样时,只能截取某一时间点上的天然气介质(如图1所示),取样气体不具备代表性。特别是若流体不稳定,取样介质和管道实际介质会有很大偏差;对天然气分析影响很大。取样钢瓶内部本身就存在了一定量的空气,最后收集到的气体实际是管道内天然气和钢瓶内空气的混合介质。若提前用天然气将取样钢瓶内的气体置换出去,人工操作上十分危险。天然气内若是含有有毒气体更会威胁的操作人员的人身安全。取样时人为判断钢瓶内是否充满,不能直观显示钢瓶内压力。管道中压力较高,操作不当会威胁操作人员的人身安全。天然气减压时可能会造成气体冷凝,这样会造成取样组分和实际介质不符。全人工操作,自动化程度低。
发明内容
本实用新型为了克服上述技术问题的不足,提供了一种天然气自动控制连续取样系统,可以完全解决上述技术问题。
解决上述技术问题的技术方案如下:
天然气自动控制连续取样系统,包括与天然气管道连接的取样探针和减压阀,所述的减压阀的进口与取样探针的出口相连接,减压阀的出口由管道分为两路,其中一路与气动隔膜采样泵连接,另一路通过管道分别与第一恒压取样钢瓶和第二恒压取样钢瓶的出口端相连接,气动隔膜采样泵受电磁阀气动控制,电磁阀气动控制的控制气源来自仪表空气,电磁阀受取样控制盘的控制,当电磁阀带电时,电磁阀的进出口导通,仪表空气通过电磁阀作用到气动隔膜采样泵的隔膜上,隔膜泵动作一次,向第一恒压取样钢瓶泵或第二恒压取样钢瓶泵送一定量的天然气;当电磁阀失电时,电磁阀的出口和放空口导通,气动隔膜采样泵隔膜腔的仪表空气通过电磁阀的放空口排出,取样控制盘通过控制电磁阀控制采样频率或总采样周期;还包括全自动天然气置换系统。
所述的减压阀具有加热功能。
所述的第一恒压取样钢瓶和第二恒压取样钢瓶均为活塞式取样钢瓶,每次取样均实现等量采样,气动隔膜采样泵泵送等量的天然气,直到第一恒压取样钢瓶或第二恒压取样钢瓶装满。
所述的第一恒压取样钢瓶和第二恒压取样钢瓶上均设置有压力指示和活塞位置指示,显示取样钢瓶当前状态。
所述的第一恒压取样钢瓶和第二恒压取样钢瓶上设置有限位开关,所述的限位开关和取样控制盘通过电连接,当第一恒压取样钢瓶或第二恒压取样钢瓶装满时,限位开关把信号传递给取样控制盘,取样控制盘控制其自动结束取样或切换到另一回路继续取样。
电磁阀为两位三通电磁阀。
第一恒压取样钢瓶与减压阀相连接的管道上设置有第四球阀、第一针阀、第一挠性软管、第二针阀、第二挠性软管和第五球阀;第二恒压取样钢瓶与减压阀相连接的管道上设置有第六球阀、第三挠性软管、第三针阀、第四针阀、第四挠性软管和第七球阀。
第一恒压取样钢瓶的托盘进口位置安装有第一限位开关,用于指示第一恒压取样钢瓶是否为空罐;托盘出口位置安装有第二限位开关,当第一恒压取样钢瓶装满时,限位开关动作指示第一恒压取样钢瓶是否为已满;第一恒压取样钢瓶的底部安装有第一机械开关,指示第一恒压取样钢瓶是否安装到位;同理,第二恒压取样钢瓶的托盘进口位置安装有第三限位开关,托盘出口位置安装有第四限位开关,底部安装有第二机械开关,第一限位开关、第二限位开关、第三限位开关、第四限位开关均为磁性限位开关,所述的第一机械开关和第二机械开关均为机械式限位开关。
全自动天然气置换系统工作流程如下:取样控制盘上设置有第一恒压取样钢瓶自动天然气置换按钮和第二恒压取样钢瓶自动天然气置换按钮,取样控制盘自动关闭第一气动球阀和第三气动球阀,同时控制第一气动两位三通阀和第二气动两位三通阀切换到第一恒压取样钢瓶的取样回路,延时几秒后自动打开第二气动球阀,然后程序自动启动气动隔膜采样泵,使天然气慢慢进入第一恒压取样钢瓶,直到第二限位开关动作,表示第一恒压取样钢瓶内的杂气已经能够全部排空,并通过高点放空排放了安全位置,然后关闭气动隔膜采样泵,延时几秒后,自动关闭第二气动球阀,打开第三气动球阀和第一气动球阀,这时第一恒压取样钢瓶中的活塞受出口天然气压力影响向初始位置移动,排放管线设置限流孔板用来限制天然气排放流速,使第一恒压取样钢瓶内的活塞缓慢移动从而保护活塞,第一限位开关能够判断是否已经恢复到初始位置,待第一恒压取样钢瓶内的活塞到达初始位置后,系统关闭第三气动球阀、第二气动球阀,打开第一气动球阀,这时控制盘上显示已经完成第一恒压取样钢瓶天然气置换工作,为正式的采样工作做好准备;第二恒压取样钢瓶取样回路的天然气置换工作和第一恒压取样钢瓶类似,取样控制盘通过控制第一气动两位三通阀和第二气动两位三通阀切换到第二恒压取样钢瓶的取样回路。
该连续取样系统能够实现一键自动取样工作,并且在一个恒压取样钢瓶装满的情况下自动切换到另一个恒压取样钢瓶继续取样工作,取样间隔和取样总周期根据需求自由设定,自动取样工作流程如下:
1)在初始情况下系统默认优先第一恒压取样钢瓶的取样回路,第一气动球阀是常开阀,第二气动球阀和第三气动球阀是常闭阀;
2)取样控制盘上设有自动取样按钮,当启动自动取样按钮时,系统会根据第一机械开关判断恒压取样钢瓶是否已经安装就位,若没有安装就位则盘面报警,并通过控制第一气动两位三通阀和第二气动两位三通阀切换到第二恒压取样钢瓶的取样回路;若判断第一恒压取样钢瓶已经安装就位,则取样工作正常进行;系统自动打开第一气动球阀,关闭第二气动球阀和第三气动球阀;延迟几秒后,启动气动采样隔膜泵,天然气被慢慢送入第一恒压取样钢瓶中,气动采样隔膜泵的泵入频率通过电磁阀的通断电时间间隔来控制,时间在控制盘上设定;第一恒压取样钢瓶装满后,第二限位开关会动作,系统自动切换到第二恒压取样钢瓶的取样回路继续取样,并在取样控制盘盘面显示第一恒压取样钢瓶已经装满;第二恒压取样钢瓶的取样回路的自动控制流程和第一恒压取样钢瓶一样;
3)第一限位开关和第三限位开关用于指示恒压取样钢瓶是否为空罐,其中一条取样回路取样结束后,若系统判断另一条取样回路的恒压取样钢瓶为空罐状态时,则自动切换到另一回路;若另一条取样回路的恒压取样钢瓶不是空罐状态时,则系统自动结束取样流程;
4)取样控制盘能够根据需要编写程序,所有的取样状态都能在盘上显示;并且能够将状态信号、报警信号等传输到控制室进行远程监控;
5)取样探针有两个接口,一个接口用于取样,另一个接口用于天然气回流;这样能使取样管线中的天然气一直处于流动状态,确保取样时的气体是天然气管道当前流动的天然气,而不是上次取样时系统残存的天然气。
本实用新型的有益效果是:
本实用新型提供了一种天然气自动控制连续取样系统,具有以下优点:
(1)能够实现连续取样,取样周期可以根据需求自己设定。由于每隔一段时间取样一次直至恒压取样钢瓶装满,所以取样气体完全能够代表整个生产周期内的流体介质,具有代表性。
(2)自动化控制连续取样系统能实现天然气自动取样和自动置换排空工作。整个过程完全自动化操作,摒弃传统取样系统在取样过程中需人工手动操作并等待取样气瓶装满的过程。系统能够自动判断取样钢瓶装是否装满,是否安装就位,并能实现取样回路的自动切换。简化了操作流程,减少了工作量,并能保障操作人员的人身安全。
(3)取样系统所有状态都能够在取样控制盘上显示,并且能够将状态信号、报警信号等传输到控制室进行远程监控。
(4)取样系统和取样钢瓶内部的其他气体在取样系统启动前已经排空,取样的气体只有管道内的天然气,避免了杂气的干扰,取样气体成分能够真实反映出实际介质,实验室化验结果会更加准确。
(5)恒压取样钢瓶带前后带压力表,能够显示钢瓶前后压力值。取样钢瓶托盘前后带有磁性活塞位置指示器,能够清晰显示当前取样钢瓶的状态。取样钢瓶托盘底部带有机械开关能够判断取样钢瓶是否安装就位。
(6)取样系统内设置了一个循环系统,天然气管道内天然气一直处于流动状态,在系统中更新循环。确保无论何时取样,取样的气体都是天然气管道当前流动的天然气,而不是上次取样时系统残存的天然气。
(7)天然气取样管线入口带有减压阀,取样压力能够根据需要自由设定,减压阀带有加热功能,能够有效防止减压后的天然气发生冷凝。
附图说明
下面结合附图和具体实施方式对本实用新型作进一步详细的说明。
图1为天然气管道传统取样系统示意图;
图2为本实用新型天然气自动控制连续取样系统示意图;
其中,图1中:1为取样探针,2为减压阀,3为第一球阀,4为第二球阀,5为压力表,6为挠性软管,7为第一针阀,8为取样钢瓶,9为第二针阀,10为天然气管道;
图2中:1为取样探针,2为第一球阀,3为减压阀,4为第二球阀,5为压力表,6为第三球阀,7为气动隔膜采样泵,8为第一气动两位三通阀,9为第四球阀,10为第一挠性软管,11为第一针阀,12为第一恒压取样钢瓶,13为第二针阀,14为第二挠性软管,15为第五球阀,16为第六球阀,17为第三挠性软管,18为第三针阀,19为第二恒压取样钢瓶,20为第四针阀,21为第四挠性软管,22为第七球阀,23为第二气动两位三通阀,24为第一气动球阀(常开,带电磁阀),25为第二气动球阀(常闭,带电磁阀),26为第三气动球阀(常闭,带电磁阀),27为高点放空,28为过滤减压阀,29为电磁阀,30为取样控制盘,31为第一限位开关,32为第二限位开关,33为第三限位开关,34为第四限位开关,35为第一机械开关,36为第二机械开关,37为仪表气源,38为天然气管道,39为限流孔板。
具体实施方式
实施例1:
天然气自动控制连续取样系统,包括与天然气管道38连接的取样探针1和减压阀3,减压阀3的进口与取样探针1的出口相连接,减压阀3的出口由管道分为两路,其中一路与气动隔膜采样泵7连接,另一路通过管道分别与第一恒压取样钢瓶12和第二恒压取样钢瓶19的出口端相连接,气动隔膜采样泵7受电磁阀29气动控制,电磁阀29气动控制的仪表气源37来自仪表空气,电磁阀29受取样控制盘30的控制,当电磁阀29带电时,电磁阀29的进出口导通,仪表气源37通过电磁阀29作用到气动隔膜采样泵7的隔膜上,隔膜泵动作一次,向第一恒压取样钢瓶泵12或第二恒压取样钢瓶泵19送一定量的天然气;当电磁阀29失电时,电磁阀29的出口和放空口导通,气动隔膜采样泵7隔膜腔的仪表空气通过电磁阀29的放空口排出,取样控制盘30通过控制电磁阀29控制采样频率或总采样周期;还包括全自动天然气置换系统。
减压阀3具有加热功能。减压阀入口管道上安装有第一球阀2,出口管道上安装有第二球阀4和第三球阀6,第二球阀4上连接有压力表5。仪表气源37的仪表空气通过过滤减压阀28过滤减压后输送。
第一恒压取样钢瓶12和第二恒压取样钢瓶19均为活塞式取样钢瓶,每次取样均实现等量采样,气动隔膜采样泵7泵送等量的天然气,直到第一恒压取样钢瓶12或第二恒压取样钢瓶19装满。
第一恒压取样钢瓶12和第二恒压取样钢瓶19上均设置有压力指示和活塞位置指示,显示取样钢瓶当前状态。
第一恒压取样钢瓶12和第二恒压取样钢瓶19上设置有限位开关,限位开关和取样控制盘30通过电连接,当第一恒压取样钢瓶12或第二恒压取样钢瓶19装满时,限位开关把信号传递给取样控制盘30,取样控制盘30控制其自动结束取样或切换到另一回路继续取样。
电磁阀29为两位三通电磁阀。
第一恒压取样钢瓶12与减压阀3相连接的管道上设置有第四球阀9、第一针阀11、第一挠性软管10、第二针阀13、第二挠性软管14和第五球阀15;第二恒压取样钢瓶19与减压阀3相连接的管道上设置有第六球阀16、第三挠性软管17、第三针阀18、第四针阀20、第四挠性软管21和第七球阀22。
第一恒压取样钢瓶12的托盘进口位置安装有第一限位开关31,用于指示第一恒压取样钢瓶是否为空罐;托盘出口位置安装有第二限位开关32,当第一恒压取样钢瓶装满时,限位开关动作指示第一恒压取样钢瓶是否为已满;第一恒压取样钢瓶的底部安装有第一机械开关35,指示第一恒压取样钢瓶是否安装到位;同理,第二恒压取样钢瓶的托盘进口位置安装有第三限位开关33,托盘出口位置安装有第四限位开关34,底部安装有第二机械开关36,所述的第一限位开关31、第二限位开关32、第三限位开关33、第四限位开关34均为磁性限位开关,所述的第一机械开关35和第二机械开关36均为机械式限位开关。
该连续取样系统能够实现一键自动取样工作,并且在一个恒压取样钢瓶装满的情况下自动切换到另一个恒压取样钢瓶继续取样工作,取样间隔和取样总周期根据需求自由设定,自动取样工作流程如下:
1)在初始情况下系统默认优先第一恒压取样钢瓶12的取样回路,第一气动球阀24是常开阀,第二气动球阀25和第三气动球阀26是常闭阀;
2)取样控制盘30上设有自动取样按钮,当启动自动取样按钮时,系统会根据第一机械开关35判断恒压取样钢瓶12是否已经安装就位,若没有安装就位则盘面报警,并通过控制第一气动两位三通阀8和第二气动两位三通阀23切换到第二恒压取样钢瓶19的取样回路;若判断第一恒压取样钢瓶12已经安装就位,则取样工作正常进行;系统自动打开第一气动球阀24,关闭第二气动球阀25和第三气动球阀26;延迟几秒后,启动气动采样隔膜泵7,天然气被慢慢送入第一恒压取样钢瓶12中,气动采样隔膜泵7的泵入频率通过电磁阀29的通断电时间间隔来控制,时间在控制盘上设定;第一恒压取样钢瓶12装满后,第二限位开关32会动作,系统自动切换到第二恒压取样钢瓶19的取样回路继续取样,并在取样控制盘30盘面显示第一恒压取样钢瓶12已经装满;第二恒压取样钢瓶19的取样回路的自动控制流程和第一恒压取样钢瓶12一样;
3)31第一限位开关31和第三限位开关33用于指示恒压取样钢瓶是否为空罐,其中一条取样回路取样结束后,若系统判断另一条取样回路的恒压取样钢瓶为空罐状态时,则自动切换到另一回路;若另一条取样回路的恒压取样钢瓶不是空罐状态时,则系统自动结束取样流程;
4)取样控制盘30能够根据需要编写程序,所有的取样状态都能在盘上显示;并且能够将状态信号、报警信号等传输到控制室进行远程监控;
5)取样探针1有两个接口,一个接口用于取样,另一个接口用于天然气回流;这样能使取样管线中的天然气一直处于流动状态,确保取样时的气体是天然气管道当前流动的天然气,而不是上次取样时系统残存的天然气。
工作原理如下:
(1)天然气管道中的天然气经过取样探针1采样,然后经过减压阀3减压。阀后压力可以根据需求自己设定,为防止减压后天然气温度降低发生冷凝,减压阀3带加热功能,能够确保减压后的温度在冷凝温度以上。天然气经过减压阀3后分成两路,一路去气动隔膜采样泵7,一路去第一恒压取样钢瓶12和第二恒压取样钢瓶19的出口端,用于平衡取样钢瓶的进出口压力。天然气经过气动隔膜采样泵7后,再经过第一气动两位三通阀8,然后被定量送到第一恒压取样钢瓶12入口。恒压取样钢瓶是活塞式取样钢瓶,每次被气动隔膜采样泵7泵送等量的天然气,直到恒压取样钢瓶装满。恒压取样钢瓶带前后压力指示和活塞位置指示,能够清晰显示当前取样钢瓶的状态。恒压取样钢瓶上还带有限位开关,当恒压取样钢瓶装满时,限位开关会把状态传到取样控制盘30,自动结束取样或切换到另一回路继续取样。
取样结束后可以取走恒压取样钢瓶。以第一恒压取样钢瓶12(主)为例,取走前需关闭第四球阀9、第一针阀11、第二针阀13、第五球阀15,然后把第一挠性管软10和第二挠性软管14的取样钢瓶端松开,将第一恒压取样钢瓶12(主)连带第一针阀11和第二针阀13一起取下,装箱送到实验室或其他实验机构进行检测化验。
(2)电磁阀29用于控制气动隔膜采样泵7。气动隔膜采样泵7的控制气源来自仪表空气,通过电磁阀29控制作用到气动隔膜采样泵7的隔膜上。电磁阀29是两位三通电磁阀,受取样控制盘30的控制。当电磁阀29带电时,电磁阀29的进出口导通,仪表气通过电磁阀作用到气动隔膜采样泵7的隔膜上,隔膜泵动作一次,向恒压取样钢瓶泵送一定量的天然气。当电磁阀29失电时,电磁阀的出口和放空口导通,气动隔膜采样泵7隔膜腔的仪表气通过电磁阀的放空口排出。取样控制盘30通过控制电磁阀29控制采样频率或总采样周期。
(3)第一限位开关31和第三限位开关33是磁性限位开关,安装于恒压取样钢瓶的托盘进口位置,用于指示恒压取样钢瓶是否为空罐。第二限位开关32和第四限位开关34也是磁性限位开关,安装于恒压取样钢瓶的托盘出口位置,当恒压取样钢瓶装满时,限位开关动作能够指示恒压取样钢瓶是否为已满。第二机械开关35和第四机械开关36是机械式限位开关,安装于恒压取样钢瓶的底部,能够指示取样钢瓶是否已经安装到位。
(4)为确保取样气体的代表性,在自动取样系统最初使用时需将系统内部的气体用工艺管道内的天然气置换出去。新型自动化控制连续取样系统能够实现全自动天然气置换操作。具体实施方法如下:
1)取样控制盘30上设置第一恒压取样钢瓶12自动天然气置换按钮和第二恒压取样钢瓶19自动天然气置换按钮。当启动第一恒压取样钢瓶12自动天然气置换按钮时,控制盘内程序通过第一机械开关35判断取样气瓶是否已经安装就位,若没有安装取样气瓶,则程序不会继续执行,并报警。若取样气瓶已经安装就位,则控制盘自动关闭第一气动球阀24和第三气动球阀26,同时控制第一气动两位三通阀8和第二气动两位三通阀23切换到第一恒压取样钢瓶12的取样回路,延时几秒后自动打开第二气动球阀25。然后程序自动启动气动隔膜采样泵7,使天然气慢慢进入第一恒压取样钢瓶12,直到第二限位开关32动作,表示第一恒压取样钢瓶12内的杂气已经能够全部排空,并通过高点放空27排放了安全位置,然后关闭气动隔膜采样泵7。延时几秒后,自动关闭第二气动球阀25,打开第三气动球阀26和第一气动球阀24,这时第一恒压取样钢瓶12中的活塞受出口天然气压力影响向初始位置移动,排放管线设置限流孔板39用来限制天然气排放流速,使恒压钢瓶内的活塞缓慢移动从而保护活塞,第一限位开关31能够判断是否已经恢复到初始位置。待恒压钢瓶内的活塞到达初始位置后,系统关闭第三气动球阀26、第二气动球阀25,打开第一气动球阀24。这时控制盘上显示已经完成第一恒压取样钢瓶12天然气置换工作,为正式的采样工作做好准备。
2)第二恒压取样钢瓶19取样回路的天然气置换工作和第一恒压取样钢瓶12类似,控制系统会通过控制第一气动两位三通阀8和第二气动两位三通阀23切换到第二恒压取样钢瓶19取样回路。
以上所述,仅是本实用新型的较佳实施例,并非对本实用新型做任何形式上的限制,凡是依据本实用新型的技术实质上对以上实施例所作的任何简单修改、等同变化,均落入本实用新型的保护范围之内。
Claims (8)
1.天然气自动控制连续取样系统,包括与天然气管道连接的取样探针和减压阀,所述的减压阀的进口与取样探针的出口相连接,其特征在于,减压阀的出口由管道分为两路,其中一路与气动隔膜采样泵连接,另一路通过管道分别与第一恒压取样钢瓶和第二恒压取样钢瓶的出口端相连接,气动隔膜采样泵受电磁阀气动控制,电磁阀气动控制的控制气源来自仪表空气,电磁阀受取样控制盘的控制,当电磁阀带电时,电磁阀的进出口导通,仪表空气通过电磁阀作用到气动隔膜采样泵的隔膜上,隔膜泵动作一次,向第一恒压取样钢瓶泵或第二恒压取样钢瓶泵送一定量的天然气;当电磁阀失电时,电磁阀的出口和放空口导通,气动隔膜采样泵隔膜腔的仪表空气通过电磁阀的放空口排出,取样控制盘通过控制电磁阀控制采样频率或总采样周期;还包括全自动天然气置换系统。
2.根据权利要求1所述的天然气自动控制连续取样系统,其特征在于,所述的减压阀具有加热功能。
3.根据权利要求1所述的天然气自动控制连续取样系统,其特征在于,所述的第一恒压取样钢瓶和第二恒压取样钢瓶均为活塞式取样钢瓶,每次取样均实现等量采样,气动隔膜采样泵泵送等量的天然气,直到第一恒压取样钢瓶或第二恒压取样钢瓶装满。
4.根据权利要求3所述的天然气自动控制连续取样系统,其特征在于,所述的第一恒压取样钢瓶和第二恒压取样钢瓶上均设置有压力指示和活塞位置指示,显示取样钢瓶当前状态。
5.根据权利要求3或4所述的天然气自动控制连续取样系统,其特征在于,所述的第一恒压取样钢瓶和第二恒压取样钢瓶上设置有限位开关,所述的限位开关和取样控制盘通过电连接,当第一恒压取样钢瓶或第二恒压取样钢瓶装满时,限位开关把信号传递给取样控制盘,取样控制盘控制其自动结束取样或切换到另一回路继续取样。
6.根据权利要求1所述的天然气自动控制连续取样系统,其特征在于,电磁阀为两位三通电磁阀。
7.根据权利要求1所述的天然气自动控制连续取样系统,其特征在于,所述的第一恒压取样钢瓶与减压阀相连接的管道上设置有第四球阀、第一针阀、第一挠性软管、第二针阀、第二挠性软管和第五球阀;所述的第二恒压取样钢瓶与减压阀相连接的管道上设置有第六球阀、第三挠性软管、第三针阀、第四针阀、第四挠性软管和第七球阀。
8.根据权利要求5所述的天然气自动控制连续取样系统,其特征在于,所述的第一恒压取样钢瓶的托盘进口位置安装有第一限位开关,用于指示第一恒压取样钢瓶是否为空罐;托盘出口位置安装有第二限位开关,当第一恒压取样钢瓶装满时,限位开关动作指示第一恒压取样钢瓶是否为已满;第一恒压取样钢瓶的底部安装有第一机械开关,指示第一恒压取样钢瓶是否安装到位;同理,第二恒压取样钢瓶的托盘进口位置安装有第三限位开关,托盘出口位置安装有第四限位开关,底部安装有第二机械开关,所述的第一限位开关、第二限位开关、第三限位开关、第四限位开关均为磁性限位开关,所述的第一机械开关和第二机械开关均为机械式限位开关。
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