联系我们

常州市安达过滤器有限公司
电话:0519-88781022 
电话:0519-88496877
电话:0519-88496053
传真:0519-88496053
地址:江苏省常州武进横林镇新横崔路29号

 

扫一扫  查看手机网站

please try againinclude error,path:/comp/message/form?compId=message_form-15210255538689722 cause:org.springframework.web.util.NestedServletException: Request processing failed; nested exception is java.lang.RuntimeException: org.springframework.dao.TransientDataAccessResourceException: ### Error querying database. Cause: java.sql.SQLException: Could not retrieve transation read-only status server ### The error may exist in URL [jar:file:/data/java_webdir/sc-site-1.0.0-SNAPSHOT_2019-07-19-10-25-06/lib/service-messageboard-provider-1.0.0-SNAPSHOT.jar!/mybatis/MessageboardFormMapper.xml] ### The error may involve defaultParameterMap ### The error occurred while setting parameters ### SQL: /*!mycat:datanode=SITE_48601 */SELECT ID,NAME,TEMPLATE_FLAG,CREATE_DATE,UPDATE_DATE FROM MESSAGEBOARD_FORM WHERE ID=? ### Cause: java.sql.SQLException: Could not retrieve transation read-only status server ; SQL []; Could not retrieve transation read-only status server; nested exception is java.sql.SQLException: Could not retrieve transation read-only status server org.springframework.dao.TransientDataAccessResourceException: ### Error querying database. Cause: java.sql.SQLException: Could not retrieve transation read-only status server ### The error may exist in URL [jar:file:/data/java_webdir/sc-site-1.0.0-SNAPSHOT_2019-07-19-10-25-06/lib/service-messageboard-provider-1.0.0-SNAPSHOT.jar!/mybatis/MessageboardFormMapper.xml] ### The error may involve defaultParameterMap ### The error occurred while setting parameters ### SQL: /*!mycat:datanode=SITE_48601 */SELECT ID,NAME,TEMPLATE_FLAG,CREATE_DATE,UPDATE_DATE FROM MESSAGEBOARD_FORM WHERE ID=? ### Cause: java.sql.SQLException: Could not retrieve transation read-only status server ; SQL []; Could not retrieve transation read-only status server; nested exception is java.sql.SQLException: Could not retrieve transation read-only status server at org.springframework.jdbc.support.SQLStateSQLExceptionTranslator.doTranslate(SQLStateSQLExceptionTranslator.java:108) at org.springframework.jdbc.support.AbstractFallbackSQLExceptionTranslator.translate(AbstractFallbackSQLExceptionTranslator.java:73) at org.springframework.jdbc.support.AbstractFallbackSQLExceptionTranslator.translate(AbstractFallbackSQLExceptionTranslator.java:81) at org.springframework.jdbc.support.AbstractFallbackSQLExceptionTranslator.translate(AbstractFallbackSQLExceptionTranslator.java:81) at org.mybatis.spring.MyBatisExceptionTranslator.translateExceptionIfPossible(MyBatisExceptionTranslator.java:71) at org.mybatis.spring.SqlSessionTemplate$SqlSessionInterceptor.invoke(SqlSessionTemplate.java:364) at com.sun.proxy.$Proxy30.selectOne(Unknown Source) at org.mybatis.spring.SqlSessionTemplate.selectOne(SqlSessionTemplate.java:159) at org.apache.ibatis.binding.MapperMethod.execute(MapperMethod.java:68) at org.apache.ibatis.binding.MapperProxy.invoke(MapperProxy.java:52) at com.sun.proxy.$Proxy426.getForm(Unknown Source) at cn.ce.ebiz.messageboard.service.impl.MessageboardFormServiceImpl.getFormWithItem(MessageboardFormServiceImpl.java:64) at sun.reflect.GeneratedMethodAccessor774.invoke(Unknown Source) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) at java.lang.reflect.Method.invoke(Method.java:606) at org.springframework.aop.support.AopUtils.invokeJoinpointUsingReflection(AopUtils.java:333) at org.springframework.aop.framework.ReflectiveMethodInvocation.invokeJoinpoint(ReflectiveMethodInvocation.java:190) at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:157) at org.springframework.transaction.interceptor.TransactionInterceptor$1.proceedWithInvocation(TransactionInterceptor.java:99) at org.springframework.transaction.interceptor.TransactionAspectSupport.invokeWithinTransaction(TransactionAspectSupport.java:280) at org.springframework.transaction.interceptor.TransactionInterceptor.invoke(TransactionInterceptor.java:96) at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:179) at org.springframework.aop.interceptor.ExposeInvocationInterceptor.invoke(ExposeInvocationInterceptor.java:92) at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:179) at org.springframework.aop.framework.JdkDynamicAopProxy.invoke(JdkDynamicAopProxy.java:213) at com.sun.proxy.$Proxy432.getFormWithItem(Unknown Source) at com.alibaba.dubbo.common.bytecode.Wrapper192.invokeMethod(Wrapper192.java) at com.alibaba.dubbo.rpc.proxy.javassist.JavassistProxyFactory$1.doInvoke(JavassistProxyFactory.java:45) at com.alibaba.dubbo.rpc.proxy.AbstractProxyInvoker.invoke(AbstractProxyInvoker.java:71) at com.alibaba.dubbo.config.invoker.DelegateProviderMetaDataInvoker.invoke(DelegateProviderMetaDataInvoker.java:48) at com.alibaba.dubbo.rpc.protocol.InvokerWrapper.invoke(InvokerWrapper.java:52) at cn.ce.ebiz.framework.remoting.DubboContextFilter.invoke(DubboContextFilter.java:220) at com.alibaba.dubbo.rpc.protocol.ProtocolFilterWrapper$1.invoke(ProtocolFilterWrapper.java:68) at com.alibaba.dubbo.rpc.filter.ExceptionFilter.invoke(ExceptionFilter.java:61) at com.alibaba.dubbo.rpc.protocol.ProtocolFilterWrapper$1.invoke(ProtocolFilterWrapper.java:68) at com.alibaba.dubbo.rpc.filter.TimeoutFilter.invoke(TimeoutFilter.java:41) at com.alibaba.dubbo.rpc.protocol.ProtocolFilterWrapper$1.invoke(ProtocolFilterWrapper.java:68) at com.alibaba.dubbo.monitor.support.MonitorFilter.invoke$original$jKFbGyDy(MonitorFilter.java:74) at com.alibaba.dubbo.monitor.support.MonitorFilter.invoke$original$jKFbGyDy$accessor$YmvuFnNI(MonitorFilter.java) at com.alibaba.dubbo.monitor.support.MonitorFilter$auxiliary$U46WpMRR.call(Unknown Source) at org.apache.skywalking.apm.agent.core.plugin.interceptor.enhance.InstMethodsInter.intercept(InstMethodsInter.java:93) at com.alibaba.dubbo.monitor.support.MonitorFilter.invoke(MonitorFilter.java) at com.alibaba.dubbo.rpc.protocol.ProtocolFilterWrapper$1.invoke(ProtocolFilterWrapper.java:68) at com.alibaba.dubbo.rpc.protocol.dubbo.filter.TraceFilter.invoke(TraceFilter.java:77) at com.alibaba.dubbo.rpc.protocol.ProtocolFilterWrapper$1.invoke(ProtocolFilterWrapper.java:68) at com.alibaba.dubbo.rpc.filter.ContextFilter.invoke(ContextFilter.java:71) at com.alibaba.dubbo.rpc.protocol.ProtocolFilterWrapper$1.invoke(ProtocolFilterWrapper.java:68) at com.alibaba.dubbo.rpc.filter.GenericFilter.invoke(GenericFilter.java:131) at com.alibaba.dubbo.rpc.protocol.ProtocolFilterWrapper$1.invoke(ProtocolFilterWrapper.java:68) at com.alibaba.dubbo.rpc.filter.ClassLoaderFilter.invoke(ClassLoaderFilter.java:37) at com.alibaba.dubbo.rpc.protocol.ProtocolFilterWrapper$1.invoke(ProtocolFilterWrapper.java:68) at com.alibaba.dubbo.rpc.filter.EchoFilter.invoke(EchoFilter.java:37) at com.alibaba.dubbo.rpc.protocol.ProtocolFilterWrapper$1.invoke(ProtocolFilterWrapper.java:68) at com.alibaba.dubbo.rpc.protocol.dubbo.DubboProtocol$1.reply(DubboProtocol.java:98) at com.alibaba.dubbo.remoting.exchange.support.header.HeaderExchangeHandler.handleRequest(HeaderExchangeHandler.java:96) at com.alibaba.dubbo.remoting.exchange.support.header.HeaderExchangeHandler.received(HeaderExchangeHandler.java:168) at com.alibaba.dubbo.remoting.transport.DecodeHandler.received(DecodeHandler.java:50) at com.alibaba.dubbo.remoting.transport.dispatcher.ChannelEventRunnable.run(ChannelEventRunnable.java:79) at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145) at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615) at java.lang.Thread.run(Thread.java:745) Caused by: java.sql.SQLException: Could not retrieve transation read-only status server at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:1078) at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:989) at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:975) at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:920) at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:951) at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:941) at com.mysql.jdbc.ConnectionImpl.isReadOnly(ConnectionImpl.java:3936) at com.mysql.jdbc.ConnectionImpl.isReadOnly(ConnectionImpl.java:3907) at com.mysql.jdbc.PreparedStatement.checkReadOnlySafeStatement(PreparedStatement.java:1258) at com.mysql.jdbc.PreparedStatement.execute$original$8JKIvTd8(PreparedStatement.java:1278) at com.mysql.jdbc.PreparedStatement.execute$original$8JKIvTd8$accessor$FTPBHvg9(PreparedStatement.java) at com.mysql.jdbc.PreparedStatement$auxiliary$CowU42Gg.call(Unknown Source) at org.apache.skywalking.apm.agent.core.plugin.interceptor.enhance.InstMethodsInter.intercept(InstMethodsInter.java:93) at com.mysql.jdbc.PreparedStatement.execute(PreparedStatement.java) at com.mchange.v2.c3p0.impl.NewProxyPreparedStatement.execute(NewProxyPreparedStatement.java:989) at org.apache.ibatis.executor.statement.PreparedStatementHandler.query(PreparedStatementHandler.java:59) at org.apache.ibatis.executor.statement.RoutingStatementHandler.query(RoutingStatementHandler.java:73) at sun.reflect.GeneratedMethodAccessor207.invoke(Unknown Source) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) at java.lang.reflect.Method.invoke(Method.java:606) at org.apache.ibatis.plugin.Plugin.invoke(Plugin.java:62) at com.sun.proxy.$Proxy584.query(Unknown Source) at org.apache.ibatis.executor.SimpleExecutor.doQuery(SimpleExecutor.java:60) at org.apache.ibatis.executor.BaseExecutor.queryFromDatabase(BaseExecutor.java:267) at org.apache.ibatis.executor.BaseExecutor.query(BaseExecutor.java:137) at org.apache.ibatis.executor.CachingExecutor.query(CachingExecutor.java:96) at org.apache.ibatis.executor.CachingExecutor.query(CachingExecutor.java:77) at org.apache.ibatis.session.defaults.DefaultSqlSession.selectList(DefaultSqlSession.java:108) at org.apache.ibatis.session.defaults.DefaultSqlSession.selectList(DefaultSqlSession.java:102) at org.apache.ibatis.session.defaults.DefaultSqlSession.selectOne(DefaultSqlSession.java:66) at sun.reflect.GeneratedMethodAccessor204.invoke(Unknown Source) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) at java.lang.reflect.Method.invoke(Method.java:606) at org.mybatis.spring.SqlSessionTemplate$SqlSessionInterceptor.invoke(SqlSessionTemplate.java:354) ... 55 more Caused by: java.sql.SQLException: ResultSet is from UPDATE. No Data. at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:1078) at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:989) at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:975) at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:920) at com.mysql.jdbc.ResultSetImpl.next(ResultSetImpl.java:6999) at com.mysql.jdbc.ConnectionImpl.isReadOnly(ConnectionImpl.java:3931) ... 82 more

Copyright (c) 2018 常州市安达过滤器有限公司版权所有         网站建设:

>
>
液压系统(非标液压设备)污染控制及过滤器选择注意事项

资讯分类

液压系统(非标液压设备)污染控制及过滤器选择注意事项

【摘要】:
液压系统的故障80%以上是由油液污染引起的,控制油液污染可以延长液压元件和液压油的使用寿命,保证系统连续可靠运转。  对液压系统油液的污染控制主要有两种措施:  一是防止污染物侵入系统,二是液压系统油液的过滤净化。  一防止污染物侵入系统  相当防止病从口入。设计密封良好的油箱,选用过滤性能良好空气滤清器,安装系统时注意清除元件及管路杂质,油缸采用良好防尘密封,注入系统的新油经过严格过滤,这些是防
 液压系统的故障80%以上是由油液污染引起的,控制油液污染可以延长液压元件和液压油的使用寿命,保证系统连续可靠运转。
  对液压系统油液的污染控制主要有两种措施:
  一是防止污染物侵入系统,二是液压系统油液的过滤净化。
  一 防止污染物侵入系统
  相当防止病从口入。设计密封良好的油箱,选用过滤性能良好空气滤清器,安装系统时注意清除元件及管路杂质,油缸采用良好防尘密封,注入系统的新油经过严格过滤,这些是防止污染物侵入系统的措施。
  二 液压系统(非标液压设备)油液的过滤净化
  吸油过滤器,管路过滤器和回油过滤器完成油液过滤净化,选用过滤器要注意以下几点:
  1 吸油口过滤器应该选用过滤精度低,通流能力大的过滤器,流通能力差的吸油过滤器容易造成空穴,吸油过滤器用于阻挡大颗粒污染物进入液压泵,防止悬浮于油液的气泡进入系统。柱塞泵一般不要用吸油过滤器,原因略。
  2 管路过滤器一般安装在比较重要的元件上游,过滤精度要高于元件摩擦副配合间隙,伺服系统管路过滤器不要用旁路单向阀,滤芯耐压力要高。
  3 回油过滤器耐压低,在活塞杆较粗的系统,流过过滤器的流量要大于泵流量,选用过滤器流量要注意,过滤器流量要大于泵流量与油缸活塞前后腔面积比的乘积。
  4 过滤器流量的选择:适当加大过滤器流量会延长过滤器寿命。
  5 过滤器精度的选择:在选择系统的主要过滤器,例如管路过滤器精度时,过滤器应该能够清除液压元件运动副动态油膜厚度的颗粒,因为这种尺寸的颗粒一旦进入到运动副的间隙内,将引起元件表面磨损,并使间隙增大,从而使尺寸较大的颗粒进入间隙,引趣进一步的磨损,造成严重磨损的“链式反应”,“链式反应”有点像传销一样,能快速导致元件的失效。
  以上介绍液压系统污染控制主要是针对固体颗粒,液压系统污染源还包括水和空气,危害同样不可忽视。。。。。。总之,液压系统的设计.制造.安装.使用和维护的整个过程都要重视液压系统污染的控制。
  小知识:
  1 人眼目视极限是40μm,而造成液压元件磨损一般是小于40μm的颗粒,肉眼看不见的
  2 过滤比的定义: ss x = 上游大于尺寸xμm的颗粒数/下游大于尺寸xμm的颗粒数
  x:为颗粒的尺寸值, 单位μm
  在液压伺服系统中一般需采用过滤比β3 ≥200的过滤器