The operators of large concrete mixer shall receive training and guidance from the manufacturer, have sufficient knowledge of the structure and performance of the machine, and obtain certain operation and maintenance experience before operating the machine. The product operation manual provided by the manufacturer is the necessary material for the operator to operate the equipment. Before operating the machine, you must browse the operation manual and operate and maintain according to the requirements of the manual.

注意大型混凝土攪拌機磨合期的工作負荷，磨合期內的工作負荷一般不要超過額定工作負荷的80％，并要部署合適的工作量，防止機器長時光持續作業所引起的過熱現象的產生。注意經常察看各儀表唆使，呈現異常，應及時停車予以消除，在原因未找到，故障未消除前，應結束作業。

Pay attention to the working load of large concrete mixer during the running in period. Generally, the working load during the running in period shall not exceed 80% of the rated working load, and appropriate workload shall be deployed to prevent overheating caused by long-term continuous operation of the machine. Pay attention to regularly check the instigation of each instrument. In case of abnormality, stop the machine in time to eliminate it. The operation shall be ended before the cause is not found and the fault is not eliminated.

還有注意經常檢討潤滑油、液壓油、冷卻液、制動液以及燃油油（水）位和品德，并注意檢討整機的密封性。檢查中發明油水缺乏過多，應剖析原因。同時，應強化各潤滑點的潤滑，建議在磨合期內，每班都要對潤滑點加注潤滑脂（特別請求除外）。操作員應堅持對大型混凝土攪拌機每一設備進行清潔，及時調劑、緊固松動的零部件，以防因松動而加劇零部件的磨損或導致零部件喪失。磨合期結束后，應對機器進行強迫頤養，做好檢討和調劑工作，同時注意油液的調換。

In addition, pay attention to regularly review the level and morality of lubricating oil, hydraulic oil, coolant, brake fluid and fuel oil (water), and pay attention to the tightness of the whole machine. In the inspection, it is found that there is too much oil and water, and the reason should be analyzed. At the same time, the lubrication of each lubricating point shall be strengthened. It is recommended that the lubricating points be filled with grease every shift during the running in period (except for special requirements). The operator shall insist on cleaning each equipment of the large concrete mixer, timely adjust and fasten the loose parts, so as to prevent the wear of parts or loss of parts due to looseness. After the running in period, the machine shall be forced to take care of, review and adjust, and pay attention to the exchange of oil.

大型混凝土攪拌機生產混凝土的原料一般分為水泥、粗細骨料、水、外加劑等材料，材料的質量好壞就直接影響出產的混凝土的質量好壞，因此在材料的選擇上不可大意。對大型混凝土攪拌機內的水泥應選擇當地大型廠商出產的正規產品，保質保量，并檢測好混凝土凝結時間、安定性、強度等重要指標。粗細骨料要選用優質砂石，砂石粒徑越大，混凝土強度就越高，但價格自然也越高。在保住強度的情況下，可降低水泥和外加劑的用量。

The raw materials for the production of concrete by large-scale concrete mixer are generally divided into cement, coarse and fine aggregate, water, admixtures and other materials. The quality of materials directly affects the quality of concrete produced. Therefore, we should not be careless in the selection of materials. For the cement in the large concrete mixer, the regular products produced by large local manufacturers shall be selected, the quality and quantity shall be guaranteed, and the important indexes such as concrete setting time, stability and strength shall be tested. High quality sand and gravel shall be selected for coarse and fine aggregates. The larger the particle size of sand and gravel, the higher the concrete strength, but the higher the price naturally. Under the condition of maintaining the strength, the dosage of cement and admixture can be reduced.

拌制混凝土用的水也不可小看，雖然一般都直接使用自來水，但也應檢驗水成分，因各地水質不同，有些地方的自來水水質不宜作為拌制混凝土使用，需特別注意。后是外加劑，外加劑的種類有磨細粉煤灰、磨細礦渣、磨細天沸石和硅灰及其復合物。為保證大型混凝土攪拌機外加劑的有效含量，應加強對液體外加劑濃度的檢驗。

The water used for concrete mixing should not be underestimated. Although tap water is generally used directly, the water composition should also be tested. Due to different water quality in different places, the tap water quality in some places should not be used for concrete mixing, and special attention should be paid. Then there are admixtures. The types of admixtures include ground fly ash, ground slag, ground zeolite, silica fume and their composites. In order to ensure the effective content of admixture in large concrete mixer, the inspection of liquid admixture concentration should be strengthened.