Underground concrete mixer for coal mine

Abstract

The invention provides a concrete mixer which is compact in structure and applicable to an underground tunnel of a coal mine. The concrete mixer mainly comprises a rack, a feed mechanism and a mixing mechanism, wherein the feed mechanism is arranged at the front end of the rack, and the mixing mechanism is arranged on the rack. The mixing mechanism can utilize a concrete raw material feeding funnel with fixed proportion to ensure the proportion of concrete and utilizes an adjustable quantitative water supply part to ensure the water-cement ratio of the concrete, a hydraulic cylinder drives a chain wheel to be lifted to feed, and after a hydraulic motor drives the mixer to mix, the hydraulic cylinder pushes the funnel to turn to pour the mixed concrete into a hopper of an underground concrete wet-spray machine. On the premise of not reducing the mixing capacity of the concrete mixer, movement pieces of the concrete mixer occupy the smallest space, so that the concrete mixer is suitable for tunnel work.

Description

technical field [0001] The invention relates to the technical field of coal mine underground construction, in particular to a compact concrete mixer. Background technique [0002] Concrete shotcrete support is widely used in the construction process of rock soil, tunnel and coal mine. It can not only strengthen and stabilize the roadway, but also play a good role in roadway sealing to prevent gas and water penetration. However, at present, the dry concrete spraying method is mostly used in the concrete spraying of coal mine roadways. Compared with the wet spraying method, the main problems of the dry spraying method are: high rebound rate, serious pollution, low quality ratio of reinforced concrete, etc. shortcoming. For this reason, the State Administration of Work Safety has listed dry spraying machines as eliminated products. [0003] At present, in concrete spraying constructions such as railways and highway tunnels, the concrete used for spraying is all commercial con...

AI Technical Summary

Problems solved by technology

However, at present, the dry concrete spraying method is mostly used in the concrete spraying of coal mine roadways. Compared with the wet spraying method, the main problems of the dry spraying method are: high rebound rate, serious pollution, low quality ratio of reinforced concrete, etc. shortcoming

However, the shotcrete site of roadway excavation in underground coal mines is generally hundreds of meters or even more than a thousand meters deep from the ground, and there is no special mixer truck suitable for various mines. very uneconomical

Therefore, the more economical and practical method is to mix concrete on site. Currently, concrete mixers that can be used for on-site mixing include reverse discharge mixers and horizontal shaft forced mixers. A common disadvantage of these mixers is that they are designed according to ground construction. It is huge and cannot adapt to the construction work in the narrow space of the coal mine underground roadway

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