In the process of producing concrete, the self compacting concrete mixer needs to accurately measure the raw materials such as aggregate, powder, liquid admixture and water. For the mixer truck without fixed outdoor workplace and requiring on-site mixing and pouring, the high-quality raw material metering process can be guaranteed by maintaining the stability and stability of equipment and frame in the metering process. The design is conducive to improve the measurement accuracy and is applied to all aspects of the mixer structure.
骨料的保送和计量，接纳了石子和砂叠加计量保送的皮带秤装配。骨料在卸料进入皮带秤的进程中，因空间的落差存在，使得卸料门领受旌旗灯号封闭后，有过剩骨料进入到皮带秤中。经由进程软件、电气节制，使其具有可以或许主动弥补骨料的落差量，切确到达计量的方针值。皮带秤利用裙边皮带停止骨料保送，皮带侧边的裙边布局能防止砂、石子向侧边漏料，保障计量切确。砂计量皮带接纳变频节制，能按照计量的须要调理保送的速率，进一步进步计量精度。
The belt scale device of superposition metering and conveying of stone and sand is adopted for the transportation and metering of aggregate. In the process of aggregate unloading into the belt scale, due to the drop of space, after the receiving signal of the unloading door is closed, excess aggregate enters the belt scale. Through software and electrical control, it can automatically compensate the drop of aggregate and accurately achieve the measurement target value. The belt scale uses skirt belt for aggregate conveying. The skirt structure on the side of the belt can prevent sand and gravel from leaking to the side and ensure accurate measurement. The sand metering belt adopts frequency conversion control, which can adjust the conveying speed according to the metering needs and further improve the metering accuracy.
粉料的利用量小于骨料的利用量，为到达切确的计量，须要接纳更严酷的办法。打金鱼
在停止粉料的配料任务时，粉料经由进程带有变频功效的螺旋保送机停止保送后，进入婚配的粉料秤入彀量。经由进程变频节制对螺旋保送速率停止调理，初始计量时疾速送料，节流时候；计量靠近方针值时慢速送料，把控精度。以此在统筹效力的环境下，实现了粉料的粗、精计量结果。与皮带秤近似，螺旋保送机与粉秤之间也存在高度落差，为晋升计量精度，粉料计量体系(如图4)接纳了“一增一减”节制算法。其进程以下：当粉秤在保送、存料阶段时，接纳增量节制算法，停止落差量的主动补秤；当粉秤在卸料阶段时，体系检测粉秤内存储量，如分量超越方针值时，体系履行减量节制算法，扣留超越的分量供下批次配料利用。因为粉料本身的纤细颗粒、轻易结块的特征，粉秤的出料口处的软毗连轻易呈现积灰、积料的景象，将对计量精度形成倒霉的影响。对此利用专为粉料卸料设想的异形软毗连，能防止粉料积料发生的拉秤景象，消弭不良影响。经由进程变频保送、“一增一减”、防拉毗连这些办法，保障打金鱼
中粉料计量切确停止。
The use of powder is less than that of aggregate. In order to achieve accurate measurement, more stringent measures need to be taken. When the mixer truck is carrying out the mixing of powder, the powder is transported through the screw conveyor with frequency conversion function and then enters the matched powder scale for measurement. The screw conveying speed is adjusted through frequency conversion control, and the material is fed quickly during initial metering to save time; When the metering is close to the target value, feed slowly to control the accuracy. In this way, the coarse and fine metering effect of powder is realized under the condition of considering efficiency. Similar to the belt scale, there is also a height drop between the screw conveyor and the powder scale. In order to improve the metering accuracy, the powder metering system (as shown in Figure 4) adopts the "one increase and one decrease" control algorithm. The process is as follows: when the powder scale is in the conveying and storage stage, the incremental control algorithm is adopted to automatically replenish the drop; When the powder scale is in the unloading stage, the system detects the memory reserves of the powder scale. If the weight exceeds the target value, the system executes the reduction control algorithm to intercept the excess weight for the next batch of batching. Due to the characteristics of fine particles and easy caking of powder, the soft connection at the discharge port of powder scale is prone to ash and material accumulation, which will have an adverse impact on the measurement accuracy. In this regard, the special-shaped soft connection specially designed for powder unloading can prevent the scale pulling phenomenon caused by powder accumulation and eliminate adverse effects. Through frequency conversion transportation, "one increase and one decrease" and anti pull connection, the accurate measurement of powder in the mixer is guaranteed.
在框架、箱体振动不可防止的环境下，为了保障水和液体外加剂切确计量，接纳传统的单吊点式、以拉式传感器计量的体例不是最好遴选。接纳拉式传感器作为计量元件的液体秤，其道理是经由进程感到计量分量发生的重力应变，转换为电旌旗灯号获得分量值，在混凝土搅拌站中利用普遍。
When the vibration of frame and box is inevitable, in order to ensure the accurate measurement of water and liquid admixture, the traditional single hanging point and pull sensor measurement is not the best choice. The principle of liquid scale using pull sensor as metering element is to convert the gravity strain generated by metering weight into electrical signal to obtain the weight value, which is widely used in concrete mixing plant.
但是因为其感到活络的特征，在停止细小方针值计量时，装备框架的振动、外力细小的扰动等都可以或许致使计量值的偏离，在布局松散、计量请求切确、工况庞杂、拌合品质请求高的自密实打鱼注册送分
中，该当有更好的设想。
However, due to its sensitive sensing characteristics, the vibration of the equipment frame and small disturbance of external force may lead to the deviation of the measured value when measuring the small target value. In the self compacting concrete mixer with compact structure, accurate measurement requirements, complex working conditions and high mixing quality requirements, there should be a better design.
经由进程屡次实验考证，水、液体外加剂利用流量计停止原资料计量，很好的降服了拉式传感器的错误谬误。在液体计量体系中接纳的流量计，其任务道理是按照电磁感到道理停止流量丈量。当水、外加剂这类导体在磁场中做切割磁力线活动时，在管道两头的电极上发生感到电势。
Through many tests, it is verified that the flowmeter is used for raw material measurement of water and liquid admixtures, which overcomes the shortcomings of pull sensor. The working principle of the flowmeter used in the liquid metering system is to measure the flow according to the principle of electromagnetic induction. When conductors such as water and additives move to cut magnetic lines of force in a magnetic field, an induced potential is generated on the electrodes at both ends of the pipeline.
经由进程丈量感到电势，连系其余已知参数换算为水或外加剂的计量分量。在流量计中，感到电压旌旗灯号与均匀流速呈线性干系，丈量精度高；丈量电极内置，抗搅扰才能强；计量进程不遭到振动身分影响，计量进程不变安稳。
By measuring the induced potential, combined with other known parameters, it is converted to the measured weight of water or admixture. In the flowmeter, the induced voltage signal has a linear relationship with the average flow rate, and the measurement accuracy is high; Built in measuring electrode, strong anti-interference ability; The metering process is not affected by vibration factors, and the metering process is stable.