1.搅拌机常规防尘措施

1. Conventional dust prevention measures for mixer

在筒仓顶部和混合主机上部设置了过滤除尘装置，了二楼以上的粉尘溢出问题，关闭了二楼以上的混合建筑，防止了混合过程中粉尘向外扩散。在混凝土罐车的清洗环节中，增加了砂分离器和三级沉淀池，回收废渣和污水的固体成分，了外部排放污染问题。

A filter and dust removal device is installed on the top of the silo and the upper part of the mixing host to solve the problem of dust overflow above the second floor. The mixing building above the second floor is closed to prevent the dust from spreading out during the mixing process. In the cleaning process of concrete tank car, sand separator and three-stage sedimentation tank are added to recover the solid components of waste residue and sewage, so as to solve the problem of external emission pollution.

2.控制搅拌机扬尘的补充措施

2. Supplementary measures for dust control of mixer

在批准混合站常规防尘措施的前提下，针对堆场除尘和进料过程，应增加建房棚、密闭筒仓、密闭输送带等措施；增加车辆轮带泥浆进出的自动清洗设备；堆场区的地面粉尘和道路粉尘问题，并定期对作业区内的所有地面道路进行硬化和喷洒，即"三封闭、一洗一洒"措施。

On the premise of approving the conventional dust control measures of the mixing station, measures such as building shed, closed silo and closed conveyor belt should be added for the dust control and feeding process of the storage yard; Add automatic cleaning equipment for mud in and out of vehicle wheel belt; Solve the problem of ground dust and road dust in the yard area, and regularly harden and spray all the ground roads in the operation area, namely "three closed, one wash and one spray" measures.
                

3.在常规措施中很容易被忽视的一种联系。

3. A kind of connection which is easy to be ignored in conventional measures.

在实际检查中，发现一些实施了上述措施的混凝土搅拌机，如封、挡、洗等，仍然存在防控死角，影响了防控效果的提高。

In the actual inspection, it is found that some concrete mixers that have implemented the above measures, such as sealing, blocking and washing, still have control dead angle, which affects the improvement of control effect.

(1)混合器的除尘环节

(1) Dust removal of mixer

工艺设计混合机除尘是集尘为主，常用和常用的两种被动式布袋除尘、强制过滤芯除尘，要求定期检查和更换滤芯(布袋)。但是，大多数搅拌机的维护滞后，易受影响的部件在这段时间内使用，混合楼三楼积尘量大，混炼厂三楼的粉尘堵塞。这部分空气中的灰尘通过未封闭的窗户逸出，使混合建筑成为混合粉尘的污染源。这部分粉尘，由于混合建筑已经"封闭"，不易发现，是目前搅拌机生产过程中的一个重要粉尘来源。

In the process design, the dust removal of mixer is mainly dust collection, and there are two kinds of commonly used passive bag dust removal and forced filter element dust removal, which require regular inspection and replacement of filter element (bag). However, the maintenance of most mixers lags behind, the easily affected parts are used during this period, the dust accumulation on the third floor of the mixing building is large, and the dust on the third floor of the mixing plant is blocked. This part of the dust in the air escapes through the unclosed windows, which makes the mixed building become the pollution source of mixed dust. This part of dust, because the mixed building has been "closed", is not easy to find, is an important source of dust in the production process of mixer.

(2)供沙环节

(2) Sand supply link

将搅拌机的集料砂从叉车铲送配料仓倾倒，通常在地面上4米处。叉车需要将沙子和石头搬到配料仓的漏斗中，在倾倒过程中会产生灰尘。考虑到这些因素，物料堆的顶部和配料仓库的顶部需要安装洒水减尘装置，以抑 制物料堆场排放产生的灰尘和叉车的装卸。然而，叉车作业中的灰尘通常很容易被忽略。

The aggregate sand of the mixer is shoveled from the forklift to the batching bin for dumping, usually 4 meters above the ground. Forklift trucks need to move sand and stones to the hopper of the batching bin, and dust will be generated during dumping. In consideration of these factors, the top of the material stack and the top of the batching warehouse need to be installed with water spraying dust reduction device to suppress the dust emitted from the material yard and the loading and unloading of forklifts. However, the dust in forklift operation is usually easy to be ignored.

(3)散装作业中的粉尘往往容易被忽略。

(3) Dust in bulk operation is often ignored.

叉车作业中的沙石在收料过程中反复碾压、飞溅，产生很细的粉尘，被叉车排气管吹起。由于叉车区通常有几十米到几百米，叉车上部没有洒水器，这部分粉尘超出了现有的防治范围，成为温室内粉尘的主要来源，对于叉车作业区的露天混合站来说，叉车作业中的粉尘问题更加突出。

Sand and gravel in forklift operation are repeatedly rolled and splashed in the process of material collection, resulting in fine dust, which is blown up by forklift exhaust pipe. As the forklift area is usually tens of meters to hundreds of meters, there is no sprinkler on the top of the forklift, this part of the dust is beyond the existing scope of prevention and control, and becomes the main source of dust in the greenhouse. For the open mixing station in the forklift operation area, the dust problem in the forklift operation is more prominent.

做好常规防尘防尘措施，注意容易忽视的细节，有效控制原材料运输、堆放、生产过程运输、拌和、预混混凝土罐车清洗等环节，基本上可以使混凝土搅拌机的粉尘处于受控状态。

The dust of concrete mixer can be controlled basically by taking conventional dust prevention measures, paying attention to the details that are easy to be ignored, and effectively controlling the links of raw material transportation, stacking, production process transportation, mixing, premixed concrete tank car cleaning, etc.

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