Continuous concrete mixing equipment
The invention belongs to cement concrete stirring technique field.
The large-scale cement concrete batch plant, as Cement Concrete Mixing, the facilities of mix storied building of various types, all by some kinds gather materials, mechanism such as supply of cement, water and additive, metering, conveying and mixer form.Traditional cement concrete stirring device, its metering and stirring are all carried out in batches.This can guarantee that every batch of compound accurate measurement, mixing quality are good.But Just because of this, make traditional batching in batches, metering and alr mode all not be used for cycle period to stir, the actual mixing time of compound only accounts for about half of operating cycle, makes the mixing plant structure of this batch mode huge, mechanism is many, and efficient is low.The advantage that adopts continous way metering, batching and alr mode be simple in structure, mechanism is few.Working continuously to make batching, metering and stirring, discharging time overlapping fully, thereby high efficient is arranged.Continuous metering can reach higher measuring accuracy in addition.But because the stirring technique of cement concrete is wet-mixing after the first dry mixing, require the time of mixing only longer, being difficult to segmentation in existing continuous mixer separates dry mixing with wet-mixing, if will be increased in the mixing time in the continuous stirring cylinder, certainly will will extend a mixing bowl length, this will make the long and insufficient rigidity of shaft, thereby increase difficulty for to a great extent the design of mixer, therefore, continuous concrete mixing equipment still can't be widely used in production at present.In addition, no matter be batch-wise or continous way, owing to gather materials is outdoor storage, its initial water content fluctuation is bigger, and cement concrete is very responsive to the ratio of mud, although being arranged, many instruments can be competent at mensuration to the sandstone material water content, in mixer, also can highly precisely control the addition of water, but the difficulty of the bigger caused test of fluctuation of water content owing to gather materials, the on-line determination that makes the initial water content that gathers materials in the existing cement concrete stirring device is often unrealistic and finally influenced the ratio of mud of cement concrete.
Purpose of the present invention be exactly the shortcoming that will overcome above-mentioned existing batch-type or continous way mixing plant propose a kind of dry mixing and wet-mixing operation separately and physical dimension reasonably, can guarantee the continuous concrete mixing equipment of the accuracy of the compound ratio of mud and match ratio.
Design of the present invention is to adopt two-stage continuous stirring mode, agitating device is divided into the front and back stages configuration, the centre connects with belt conveyor, in the elementary and centre final stage mixer, the water content of compound detects And testing result in view of the above in the middle of terrain carries out, and the amount of water of final stage mixer is carried out working control.Formation of the present invention is: aggregate bin more than 1 and continous batching metering device separately thereof are arranged, the batching belt conveyer is arranged below them, be connected to a vibratory sieve, the vibratory sieve below is an end of the belt conveyer that gathers materials, there are cement silo and continous batching metering device thereof in the gather materials top of belt conveyer, the gather materials below of the other end of belt conveyer is elementary mixer, elementary mixer top is provided with elementary water and the metering device of adding, additive metering and feedway, the below of elementary mixer is an end of middle compound belt conveyer, middle compound belt conveyer is provided with the mixture moisture content analyzer, the below of the other end of middle compound belt conveyer is the final stage mixer, the final stage mixer is provided with additional water and the metering device of adding of final stage, final stage mixer below is a finished product compound warehouse, is provided with the operation control system of complete machine in addition.
Advantage compared with prior art of the present invention is: owing to adopted two-stage continuous stirring mode, two continuous mixers of separate configuration, every fuselage can shorten, the draw ratio of shaft can be not excessive, thereby the difficulty on guarantee to have avoided under the identical mixing time prior art to extend structural design that a mixing bowl length brought, make the physical dimension of every mixer reasonable, and, can make required dry mixing of the cement concrete system of mixing and wet-mixing operation separately, on the front and back stages mixer, realize respectively, thus the quality that has guaranteed to mix and stir compound.Owing to be the detection of between two-stage stirs, having carried out mixture moisture content, under the situation that adds water on a small quantity, carried out the dry mixing process through elementary mixer owing to gather materials, various components have been mixed quite evenly, thereby the detection of water content reaches desired accuracy easily, at this moment, again according to the water content of measured middle compound, in the final stage mixer, carry out replenishing the second time and add water, make the final water yield of compound precisely controlled, make the ratio of mud fluctuation of compound very little, so just overcome the traditional batch mixing plant to the sand in gathering materials, stone carries out the inaccurate difficulty of initial aqueous quantitative determination, guaranteed the control accuracy of the ratio of mud of cement concrete effectively, thereby make every working index of the cement concrete that measures in a continuous manner and stir more stable, its fluctuation is significantly smaller than traditional mixing plant in batches.
Fig. 1 is a structural representation of the present invention.
Provide embodiments of the invention below in conjunction with accompanying drawing.
As shown in Figure 1, concrete structure of the present invention is, 3 aggregate bins 1 and batching metering belt feeder 2 separately thereof are arranged, batching belt conveyer 3 is arranged below them, be connected to a single-deck vibrating screen 4, the below of vibratory sieve 4 is the end of belt conveyer 5 of gathering materials, the gather materials top of belt conveyer 5 is cement silo 6 and continous batching metering device 7 thereof, the gather materials below of the other end of belt conveyer 5 is elementary dual horizontal axle continuous mixer 8, the top of elementary mixer 8 is provided with additive metering and feedway 9, elementary water and the metering device 10 of adding, the below of elementary mixer 8 is an end of middle compound belt conveyer 11, middle compound belt conveyer 11 is provided with mixture moisture content detector 12, the below of the other end of middle compound belt conveyer 11 is a final stage dual horizontal axle continuous mixer 13, the top of final stage mixer 13 is provided with additional water and the metering device 14 of adding of final stage, the below of final stage mixer 13 is a finished product compound warehouse 15, also is provided with their operation control system 16 in addition.The course of work of the present invention is: three kinds of aggregates (coarse crushing stone, fine stone and sand) of cement concrete are added to respectively on three aggregate bins 1, by ingredients belt 2 separately, carry out continuous metering according to control room 16 assigned formula, batching belt conveyer 3 through the bottom is delivered to vibratory sieve 4, thick excessively aggregate is screened out, deliver to first order dual horizontal axle continous way mixer 8 by the belt conveyer 5 that gathers materials and stir.Meanwhile, send cement here, under the given grating in control room 16, carry out continuous metering, deliver to the belt conveyer 5 that gathers materials and together be sent to first order continuous mixer 8 with the aggregate of accurate measurement and stir through its continuous metering device 7 from cement bin 6.When stirring, from additive metering and feedway 9, add additive continuously continuously simultaneously by control room 16 given proportionings, add a spot of water in given ratio continuously from elementary adding water and the metering device 10, carry out the dry mixing of cement concrete.Having carried out the middle compound of ' doing ' of uniform mixing discharges continuously from elementary mixer 8, deliver to final stage continous way twin-shaft mixer 13 through middle compound belt conveyer 11 and carry out the stirring second time, simultaneously when secondary stirs, add water and metering device 14 fills up required moisture content by given amount of water continuously, in final stage mixer 13, compound is carried out wet-mixing by final stage is additional.Concrete finished product after the wet-mixing falls within warehouse 15.Because the initial moisture content that elementary aggregate air storage causes need be deducted in the total amount of water of concrete, so mixture moisture content detector 12 in the middle of on middle compound belt conveyer 11, installing, thereby revise the cement concrete that has guaranteed that the system of finally being mixed is good automatically by 16 pairs of final stage amount of water of control system according to its testing result.
