必须注意，由于支腿臂架系统和搅拌系统都属于开式系统，在预热后期，可以伸展支腿和臂架，启动搅拌器，以达到换向阀之后的液压油流回油箱，整个液压系统的油温逐渐趋于正常的效果。

It must be noted that since both the outrigger boom system and the mixing system are open systems, in the late preheating period, the outrigger and boom can be extended and the mixer can be started to achieve the effect that the hydraulic oil after the reversing valve flows back to the oil tank, and the oil temperature of the whole hydraulic system gradually tends to be normal.

搅拌一体车的液压系统中，支腿和臂架系统有一定的特殊性。出于安全考虑，每一个垂直支腿油缸和每一个臂架油缸都设置有平衡阀（俗称“液压锁”），只有当换向阀打开时，平衡阀才会接通油路。否则，平衡阀一直处于关闭状态，将油缸内外的液压油隔绝开。

In the hydraulic system of the mixer truck, the outrigger and boom system have certain particularity. For safety reasons, each vertical outrigger cylinder and each boom cylinder are equipped with a balance valve (commonly known as "hydraulic lock"), and the balance valve will connect the oil circuit only when the reversing valve is opened. Otherwise, the balance valve is always closed to isolate the hydraulic oil inside and outside the cylinder.

那么，在预热后期伸展支腿和臂架时，如果要将油缸内原有的低温液压油全部挤回油箱，保持油缸内液压油的温度平衡，避免因油缸活塞两侧存在温差而发生油缸自行，则必须让油缸从完全缩回到完全伸出运动一个全行程，否则总有部分液压油不能回到油箱。而这种全行程操作既浪费时间，又浪费柴油。

Then, when extending the outrigger and boom at the later stage of preheating, if you want to squeeze all the original low-temperature hydraulic oil in the cylinder back into the oil tank, maintain the temperature balance of the hydraulic oil in the cylinder, and avoid the cylinder self motion due to the temperature difference on both sides of the cylinder piston, you must make the cylinder move from fully retracted to fully extended for a full stroke, otherwise some hydraulic oil cannot return to the oil tank. This full stroke operation wastes both time and diesel.

更有甚者，如果伸展空间被限制，全行程是根本做不到的。所以，我们在正式伸展支腿和臂架以前，应该采取多次往复运动的方式，在级小的范围内多次伸缩各个油缸，使缸内原有的低温油与进入缸内的高温油充分混合，利用对流和传导原理使缸内液压油整体温度上升。待缸内油温平衡后，再正式支放支腿、展开臂架。

What's more, if the stretching space is limited, the whole journey is simply impossible. Therefore, before formally extending the outrigger and boom, we should adopt the method of multiple reciprocating movements to expand and retract each oil cylinder within a small range of stages, so that the original low-temperature oil in the cylinder can be fully mixed with the high-temperature oil entering the cylinder, and the overall temperature of the hydraulic oil in the cylinder can be increased by using the convection and conduction principle. After the oil temperature in the cylinder is balanced, the outrigger shall be formally supported and the boom shall be unfolded.

综上所述，车上装预热操作看似千篇一律，实际上是否操作得当将直接影响搅拌车的故障率、维护成本，甚至安全状态。对于其它设备，主泵送系统预热的基本方法与泵车是一致的，其它系统预热的基本方法也可参考泵车。同时必须注意，预热操作方法不可以违背设备使用说明书的相关规定。希望广大搅拌车设备操作人员，在日常工作中养成正规操作的良好习惯，顺利完成冬施任务。

To sum up, the preheating operation on the truck seems to be the same. In fact, whether it is properly operated will directly affect the failure rate, maintenance cost and even safety status of the mixer truck. For other equipment, the basic preheating method of the main pumping system is the same as that of the pump truck, and the basic preheating method of other systems can also refer to the pump truck. At the same time, it must be noted that the preheating operation method cannot violate the relevant provisions of the equipment operation manual. It is hoped that the mixing truck equipment operators can develop a good habit of regular operation in their daily work and successfully complete the winter construction task.

以上就是问题解答的相关内容了，希望能够帮助到大家，如对这一问题还存在任何疑问，都欢迎关注我们网站http://www.jfhntjbj.com并咨询我们的工作人员，将竭诚为您服务。

The above is the relevant content of the question answer. I hope it can help you. If you still have any questions about this problem, you are welcome to follow our website http://www.jfhntjbj.com And consult our staff, will serve you wholeheartedly.