CS201476B1 - Facility for transport and spraying the concrete mixture substantially limiting the dust nuisance - Google Patents

Description

The present invention provides an apparatus for conveying and spraying concrete mixtures substantially reducing dust. The device consists of a machine for dosing and transporting sand and aggregates and a cement dosing unit and is particularly suitable for mining purposes.

Devices commonly referred to as concrete spraying machines are used for conveying and spraying concrete mixtures. These machines operate with a dry concrete mix which is dosed into the hopper of the machine and pneumatically conveyed by pipeline to the spray nozzle where it is humidified by the mixing liquid.

The disadvantage of these concrete mixture spraying devices is, in particular, the considerable dust produced during the preparation of the dry concrete mixture, when filling the hopper of the machine with the dry concrete mixture and in the case of wear or damage to the sealing parts of the dosing and transporting machine. The machine operator is forced to work in a dusty environment, which does not meet the hygienic requirements. The work involved in filling the machine and dosing cement is very strenuous and unhygienic.

These drawbacks are largely eliminated by the apparatus for conveying and spraying the concrete composition substantially reducing the dustiness of the present invention, consisting of a cement dispenser, a dosing machine and a sand transporting machine. The essence of this is that the outlet of the cement dispenser is connected to the mixing chamber of the solid components of the dry concrete mixture, which is located on the conveying path between the mouth of the dosing and conveying machine and the spray nozzle.

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201 470

The apparatus for conveying and spraying the concrete compositions according to the invention substantially reduces the dust generated during handling of the dry concrete mixture, simplifies the preparation of the mixture and its transport to the machine hopper. The equipment contributes to increase of productivity of concrete works in mining operations while improving working conditions and culture of work.

The accompanying drawing shows schematically an exemplary arrangement of a device for conveying and spraying a concrete mixture according to the invention.

The apparatus comprises a machine 10 for dispensing and transporting sand and aggregate and a cement dispenser 20. The outlet 21 of the cement feeder 20 is connected to the mixing chamber 11 of the solid components of the concrete mixture. The mixing chamber 11 is located on the conveying path 12 between the mouth of the dosing and conveying machine 10 and the spray nozzle 14. The spray nozzle 14 is connected to the inlet 13 of the mixing liquid. A vibration exciter 16 is mounted on the outer shell of the container 15 of the dosing and conveying machine 10.

The aggregates together with the sand are conveyed to the container 15 of the dosing and conveying machine 10. The reservoir 15 is provided with a vibration exciter 16 for continuously sliding sand and aggregate. A mixing chamber 11 is connected downstream of the mouth of the dosing and conveying machine 10 on the conveying path 12, into which the outlet 21 of the cement doser 20 is connected. The mixture of sand, aggregate and cement is conveyed pneumatically. The conveying path 12 terminates in a spray nozzle 14 in which the concrete mixture is moistened with the mixing liquid supplied by the inlet 13.

The device according to the invention is intended primarily for concreting work in mining operators, for example for concreting floors and reinforcement.

Claims (1)

SUBJECT OF THE INVENTION Apparatus for conveying and spraying concrete mixtures substantially reducing dustiness, in particular for mining purposes, consisting of a sand and aggregate dosing and transporting machine and a cement dispenser, characterized in that the outlet (21) of the cement dispenser (20) is connected to a mixing chamber ( 11) solid constituents of a dry concrete mixture, which is located on a conveying path (12) between the mouth of the dosing and conveying machine (10) and the spray nozzle (14).