EP1118380B1 - Kontinuierliche mischanlage - Google Patents

Kontinuierliche mischanlage Download PDF

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Publication number
EP1118380B1
EP1118380B1 EP99973769A EP99973769A EP1118380B1 EP 1118380 B1 EP1118380 B1 EP 1118380B1 EP 99973769 A EP99973769 A EP 99973769A EP 99973769 A EP99973769 A EP 99973769A EP 1118380 B1 EP1118380 B1 EP 1118380B1
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EP
European Patent Office
Prior art keywords
continuous
unit
continuously
outlet
aggregate
Prior art date
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Expired - Lifetime
Application number
EP99973769A
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English (en)
French (fr)
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EP1118380A1 (de
EP1118380A4 (de
Inventor
Kazuie Yamada
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Japan Institute of Construction Engineering
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Japan Institute of Construction Engineering
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Publication of EP1118380A4 publication Critical patent/EP1118380A4/de
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F25/00—Flow mixers; Mixers for falling materials, e.g. solid particles
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F35/00—Accessories for mixers; Auxiliary operations or auxiliary devices; Parts or details of general application
    • B01F35/71—Feed mechanisms
    • B01F35/717—Feed mechanisms characterised by the means for feeding the components to the mixer
    • B01F35/7173—Feed mechanisms characterised by the means for feeding the components to the mixer using gravity, e.g. from a hopper
    • B01F35/71731—Feed mechanisms characterised by the means for feeding the components to the mixer using gravity, e.g. from a hopper using a hopper
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B28—WORKING CEMENT, CLAY, OR STONE
    • B28C—PREPARING CLAY; PRODUCING MIXTURES CONTAINING CLAY OR CEMENTITIOUS MATERIAL, e.g. PLASTER
    • B28C7/00—Controlling the operation of apparatus for producing mixtures of clay or cement with other substances; Supplying or proportioning the ingredients for mixing clay or cement with other substances; Discharging the mixture
    • B28C7/04—Supplying or proportioning the ingredients
    • B28C7/0422—Weighing predetermined amounts of ingredients, e.g. for consecutive delivery
    • B28C7/0431—Weighing predetermined amounts of ingredients, e.g. for consecutive delivery using a weighing belt or the like
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F25/00—Flow mixers; Mixers for falling materials, e.g. solid particles
    • B01F25/40—Static mixers
    • B01F25/42—Static mixers in which the mixing is affected by moving the components jointly in changing directions, e.g. in tubes provided with baffles or obstructions
    • B01F25/43—Mixing tubes, e.g. wherein the material is moved in a radial or partly reversed direction
    • B01F25/432—Mixing tubes, e.g. wherein the material is moved in a radial or partly reversed direction with means for dividing the material flow into separate sub-flows and for repositioning and recombining these sub-flows; Cross-mixing, e.g. conducting the outer layer of the material nearer to the axis of the tube or vice-versa
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F25/00—Flow mixers; Mixers for falling materials, e.g. solid particles
    • B01F25/40—Static mixers
    • B01F25/42—Static mixers in which the mixing is affected by moving the components jointly in changing directions, e.g. in tubes provided with baffles or obstructions
    • B01F25/43—Mixing tubes, e.g. wherein the material is moved in a radial or partly reversed direction
    • B01F25/432—Mixing tubes, e.g. wherein the material is moved in a radial or partly reversed direction with means for dividing the material flow into separate sub-flows and for repositioning and recombining these sub-flows; Cross-mixing, e.g. conducting the outer layer of the material nearer to the axis of the tube or vice-versa
    • B01F25/4321—Mixing tubes, e.g. wherein the material is moved in a radial or partly reversed direction with means for dividing the material flow into separate sub-flows and for repositioning and recombining these sub-flows; Cross-mixing, e.g. conducting the outer layer of the material nearer to the axis of the tube or vice-versa the subflows consisting of at least two flat layers which are recombined, e.g. using means having restriction or expansion zones
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F25/00—Flow mixers; Mixers for falling materials, e.g. solid particles
    • B01F25/80—Falling particle mixers, e.g. with repeated agitation along a vertical axis
    • B01F25/83—Falling particle mixers, e.g. with repeated agitation along a vertical axis with receptacles provided with fixed guiding elements therein, e.g. baffles; Cross-mixers comprising crossing channels for guiding the falling particles
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F25/00—Flow mixers; Mixers for falling materials, e.g. solid particles
    • B01F25/80—Falling particle mixers, e.g. with repeated agitation along a vertical axis
    • B01F25/90—Falling particle mixers, e.g. with repeated agitation along a vertical axis with moving or vibrating means, e.g. stirrers, for enhancing the mixing
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F33/00—Other mixers; Mixing plants; Combinations of mixers
    • B01F33/26—Mixers with an endless belt for transport of the material, e.g. in layers or with mixing means above or at the end of the belt
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F33/00—Other mixers; Mixing plants; Combinations of mixers
    • B01F33/80—Mixing plants; Combinations of mixers
    • B01F33/805—Mixing plants; Combinations of mixers for granular material
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F33/00—Other mixers; Mixing plants; Combinations of mixers
    • B01F33/80—Mixing plants; Combinations of mixers
    • B01F33/834—Mixing in several steps, e.g. successive steps
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F35/00—Accessories for mixers; Auxiliary operations or auxiliary devices; Parts or details of general application
    • B01F35/20—Measuring; Control or regulation
    • B01F35/22—Control or regulation
    • B01F35/221—Control or regulation of operational parameters, e.g. level of material in the mixer, temperature or pressure
    • B01F35/2218—Weight of at least one component to be mixed
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F35/00—Accessories for mixers; Auxiliary operations or auxiliary devices; Parts or details of general application
    • B01F35/71—Feed mechanisms
    • B01F35/717—Feed mechanisms characterised by the means for feeding the components to the mixer
    • B01F35/71705—Feed mechanisms characterised by the means for feeding the components to the mixer using belts
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F35/00—Accessories for mixers; Auxiliary operations or auxiliary devices; Parts or details of general application
    • B01F35/71—Feed mechanisms
    • B01F35/717—Feed mechanisms characterised by the means for feeding the components to the mixer
    • B01F35/71775—Feed mechanisms characterised by the means for feeding the components to the mixer using helical screws
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F35/00—Accessories for mixers; Auxiliary operations or auxiliary devices; Parts or details of general application
    • B01F35/80—Forming a predetermined ratio of the substances to be mixed
    • B01F35/892—Forming a predetermined ratio of the substances to be mixed for solid materials, e.g. using belts, vibrations, hoppers with variable outlets or hoppers with rotating elements, e.g. screws, at their outlet
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B28—WORKING CEMENT, CLAY, OR STONE
    • B28C—PREPARING CLAY; PRODUCING MIXTURES CONTAINING CLAY OR CEMENTITIOUS MATERIAL, e.g. PLASTER
    • B28C5/00—Apparatus or methods for producing mixtures of cement with other substances, e.g. slurries, mortars, porous or fibrous compositions
    • B28C5/02—Apparatus or methods for producing mixtures of cement with other substances, e.g. slurries, mortars, porous or fibrous compositions without using driven mechanical means effecting the mixing
    • B28C5/04—Gravitational mixing; Mixing by intermingling streams of ingredients
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F23/00—Mixing according to the phases to be mixed, e.g. dispersing or emulsifying
    • B01F23/60—Mixing solids with solids
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F25/00—Flow mixers; Mixers for falling materials, e.g. solid particles
    • B01F25/80—Falling particle mixers, e.g. with repeated agitation along a vertical axis
    • B01F25/84—Falling-particle mixers comprising superimposed receptacles, the material flowing from one to the other, e.g. of the sandglass type
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F33/00—Other mixers; Mixing plants; Combinations of mixers
    • B01F33/80—Mixing plants; Combinations of mixers
    • B01F33/82—Combinations of dissimilar mixers

Definitions

  • the present invention relates to a continuous mixing plant, and more particularly to a continuous mixing plant that is suitable for continuously producing concrete for a short period of time simply by, for example, continuously feeding necessary material while measuring it and dropping the material by the gravitational force.
  • a batcher plant that is an apparatus for producing concrete is equipment for mixing cement, water, sand, rough sand, mixer agent and the like for the material of the concrete measured in a predetermined composition for producing the concrete that is kept in non-solid condition, and has been widely used in a dam construction, a civil construction, a green concrete factory, a concrete secondary factory or the like.
  • the conventional batcher plant is roughly composed of a material reservoir portion, a metering portion, a kneading portion and a loading portion.
  • the batcher plants are divided into various types in accordance with these arrangements.
  • the most typical system is of a tower type as shown in Fig. 11.
  • a receiving chamber 2 a material reservoir 3 (a cement reservoir 3a, a sand reservoir 3b, a small stone reservoir 3c, a water reservoir 3d), a metering portion 4 (a cement metering tank 4a, a sand metering tank 4b, a small stone metering tank 4c), a concrete mixer 5, a concrete hopper 6 and the like are overlapped in order in a tower-like shape from above.
  • a type in which an operating chamber 7 projects from a metering or mixer chamber 8 and a type in which an operating chamber 7 is separated from the plant are popular.
  • Japanese patents JP 10286449 and JP092534670 intend to provide a kneading device that efficiently and mechanically kneads materials to be kneaded by passing the materials to be kneaded through the deformed passages, which are gradually changed in their sectional shapes over the longitudinal direction by the free fall arising by their own weights.
  • the inlet side end is juxtaposed with two or more inlet parts of a rectangular shape one or more partition walls and the outlet side end is also juxtaposed with two or more outlet parts of the rectangular shape by at least one or more partition walls.
  • the respective inlet parts and the respective outlet parts are communicated with the deformed passages varying in the sectional shapes respectively continuously in the longitudinal direction.
  • Document EP 0 796 650 shows a mixing apparatus for mixing materials having a fluidity, comprising: an apparatus body including a plurality of irregular passageways with their sectional configurations gradually varying in longitudinal directions; and material force-feeding means, connected to an inlet side of said apparatus body, for feeding the mixed materials by pressurization into said respective irregular passageways, wherein inlets of said irregular passageways are formed with a certain arrangement pattern at an inlet-side edge portion of said apparatus body, and outlets of said irregular passageways are formed with another arrangement pattern different from the arrangement pattern of the inlets, at an outlet-side edge portion of said apparatus body.
  • WO 00/13778 is a document according to Art. 54(3) EPC. It discloses a kneader for kneading an object material by passing it from an inlet port to an outlet port of each of a plurality of irregular passages, each with a varied sectional shape, comprising: a kneader body having a supply port for supplying the object material at one end and a discharge port at the other end and having said plurality of irregular passages in communication with said supply port and said discharge port, and material supply means for feeding the object material to the kneader body, each irregular passage of said kneader body has its sectional shape varying progressively from the inlet port to the outlet port, merging and dividing means for merging and dividing the object material passing through each irregular passage being provided between the inlet port and the outlet port of each irregular passage, a direction of each irregular passage
  • an object of the present invention is to provide a continuous mixing plant that, for example, simply continuously feeds the necessary materials while metering the amount thereof and drops these materials by the gravitational force so that the mixed material may be manufactured continuously for a short period of time suitably, and in the case where the mixed material is concrete, it is possible to manufacture higher quality concrete continuously for a short period of time while accurately continuously metering each material and feeding it to the mixer.
  • the present invention relates to a continuous mixing plant.
  • the plant further comprises a metering means for metering a delivery amount locally and for every ermined time in a midway for continuously delivering thepredet material fed from each of the continuous metering and feeding means, and the continuous metering and feeding means receives a signal from this metering means to be feedback-controlled, thereby enhancing precision of the material supply amount.
  • a continuous mixing plant comprising a main belt conveyor unit for delivering aggregate; a continuous aggregate feeding means for keeping on feeding at least one kind of aggregate to the main belt conveyor unit while metering the material; a first detecting unit installed downstream of a delivery belt of the main belt conveyor unit for metering continuously at a predetermined position a local amount of the aggregate that has been transferred on the delivery belt of the main belt conveyor unit, thereby outputting a signal, a continuous fixed amount supply means installed downstream of the main belt conveyor unit having the aggregate fed for keeping on feeding a fixed amount of mortar or cement paste continuously to the main belt conveyor unit; and at least one mixing box unit disposed just below a delivery end of the main belt conveyor unit, characterized in that the continuous fixed amount supply unit receives the signal continuously outputted from the first detecting unit and
  • the continuous aggregate feeding means includes: a belt conveyor unit for feeding the aggregate to the main conveyor unit; a material delivering unit for continuously feeding the aggregate to the belt conveyor unit; and a second detecting unit installed downstream of the belt conveyor unit so as to output a signal by continuously metering at a predetermined position an amount of the aggregate that is transferred on the delivery belt of the belt conveyor unit, the material delivering unit being feedback-controlled upon receiving the signal continuously outputted from the second detecting unit, to thereby enhance precision of the supply amount of the aggregate delivered and fed to the belt conveyor unit.
  • the continuous mixing plant according to the present invention is characterized in that the material delivering unit includes a vibrating feeder, and a frequency of the vibrating feeder is changed on the basis of the signal continuously outputted from the second detecting unit to feedback-control the cutting amount of the aggregate to the belt conveyor unit.
  • the continuous mixing plant according to the present invention is characterized in that one or both of the first and second detecting units are composed of a belt scale unit for continuously metering a weight of the delivery belt as a whole at a predetermined position.
  • the continuous mixing plant according to the present invention is characterized in that the mixing box unit is constituted by connecting a plurality of elements substantially in a vertical direction, each of the elements is provided with an inlet end, an outlet end and the plurality of modified passages stretching from the inlet end to the outlet end, the inlet of each of the modified passages formed at the inlet end and the outlet of each of the modified passages formed at the outlet end have different arrangement patterns, furthermore, each adjacent elements are connected in intimate contact with each other at the outlet end and the inlet end, and a joint portion between the inlet and the outlet of each of the modified passages on the end portion of the joint side of each of the elements constitutes the merging and dividing means.
  • the elements are provided with rectangular openings being arranged on the right and left sides as an arrangement pattern of the inlet of each of the modified passages and with rectangular openings being arranged vertically as an arrangement pattern of the outlet of each of the modified passages, and are constituted of at least two kinds to differentiate the communication state between each inlet and each outlet of each of the modified passages, and the mixing box unit is constituted by connecting alternately the different kinds of the elements with each other in the vertical direction.
  • an openable/closeable cut gate is provided at an outlet of the lowermost element constituting the mixing box unit, and a discharge amount of material dropping by a gravitational force is adjusted, whereby a control of a filling rate of the material in the modified passage of each element of the mixing box unit is performed.
  • each material is fed continuously from the continuous supply means while being metered and caused to fall into the mixing box unit. Namely, when each material is continuously cast into the plurality of the modified passages on the inside from the inlet end located above the mixing box unit, the material is caused to fall through each modified passage by the gravitational force.
  • Each modified passage has a cross-sectional shape continuously varying in its longitudinal direction.
  • the material falling through this modified passage is subjected to a compressive deformation effect and is mixed.
  • the material passing through each modified passage is merged by passing through the dividing and merging means during a fall through this modified passage. Then, the material is divided (division) into each modified passage and falls. Preferably, this is repeated to perform the good mixture.
  • a mixing box unit in general, a plurality of elements are connected with each other so as to overlap in the vertical direction and thus, a dividing and merging effect can be inevitably obtained.
  • the element is provided with an inlet end, an outlet end and a plurality of modified passages from the inlet end to the outlet end.
  • the arrangement pattern of the inlet of each of the modified passages formed in the inlet end is different from the arrangement pattern of the outlet of each of the modified passages formed in the outlet end.
  • the joint portion of the inlet and the outlet of each of the modified passages of each element forms the merging and dividing means.
  • the element in which the rectangular openings are arranged on the right and left as the arrangement pattern of the inlet of each of the modified passages and the rectangular openings are arranged vertically as the arrangement pattern of the outlet is used, if at least two kinds of elements that have different communication states between each inlet and each outlet of each of the modified passages are prepared and the different kinds of elements are connected in the vertical direction alternately to form the mixing box unit, the linear communication portion from the upper inlet end to the lower outlet end of the mixing box unit is shortened or eliminated whereby the mixture effect of the falling material is enhanced.
  • this continuous mixing plant may be used as a plant for manufacturing the concrete.
  • the supply amount of the aggregate to be fed from the material delivering unit constituting the continuous aggregate feeding means is detected by the detecting unit to perform the feedback control to enhance the precision of the supply amount.
  • the amount of the aggregate to be continuously fed by the main conveyor unit is detected in order by the detecting unit so as to feed the mortar or cement paste from the continuous fixed amount supply unit to the main conveyor unit.
  • Fig. 1 is a schematic structural view showing a continuous concrete manufacturing plant in accordance with the embodiment of the present invention.
  • Fig. 2 is a partially fragmentary frontal view of a continuous fixed amount supply unit for feeding mortar or cement paste to a main belt conveyor unit.
  • Fig. 3 is a perspective view showing a state in which two different kinds of elements are connected to each other for a mixing box unit to be used in the continuous concrete manufacturing plant shown in Fig. 1.
  • Fig. 4 is a process view showing, like a model diagram, changing states of cross-sections of the object material to be mixed in the case where the two elements are connected to each other, at an inlet end portion, an intermediate portion and an outlet end portion of each element.
  • Fig. 5 is a plan view schematically showing each modified passage in the interior of one kind of the elements in the mixing box unit, as viewed from the inlet end portion.
  • Fig. 6 is a plan view schematically showing each modified passage in the interior of the other kind of the elements, as viewed from the inlet end portion.
  • Fig. 7 is a perspective view showing the element, i.e., an element provided in its interior with four modified passages in another mixing box unit to be usable in the continuous concrete manufacturing plant in accordance with the present invention.
  • Fig. 8 is a process view showing, like a model diagram, changing states of cross-sections of the object material to be mixed in the case where the two elements shown in Fig. 7 are connected to each other, at an inlet end portion, an intermediate portion and an outlet end portion of each element.
  • Fig. 9 is a schematic structural view of another embodiment of a continuous mixing plant according to the present invention as viewed from above.
  • Fig. 10 is a schematic structural view of still another embodiment of a continuous mixing plant according to the present invention.
  • Fig. 11 is a schematic structural view showing a conventional batch processing type batcher plant.
  • the continuous concrete manufacturing plant 10 includes a first main belt conveyor unit 11 installed slantwise and a second main belt conveyor unit 12 installed horizontally. These two main belt conveyor units 11 and 12 are adapted to continuously delivery the material in a ride-on manner.
  • units 13, 14 and 15 as three continuous aggregate feeding means for keeping on feeding three kinds of aggregates continuously while metering them are installed in order in a delivery direction of the main belt conveyor unit 11. Since the continuous aggregate supply units 13 to 15 are substantially the same, one of them will be described.
  • the continuous aggregate supply unit 13 is provided with a belt conveyor unit 13a.
  • a vibrating feeder 13b as a unit for delivering the material is installed at an inlet end of this belt conveyor unit 13a.
  • a hopper 13c for feeding the aggregate to the feeder 13b is provided above the vibrating feeder 13b.
  • a belt scale unit 13d for metering a local weight of the delivery belt that is continuously moving carrying the aggregate is installed downstream of the vibrating feeder 13b in the belt conveyor unit 13a.
  • This belt scale unit 13d is adapted to continuously detect the local weight of the delivery belt moving and carrying the aggregate by means of a load cell (not shown) and at the same time to output an electric signal to a control unit (not shown).
  • the control unit calculates continuously a weight value from the signal detected by the load cell and outputted, and calculates the amount of the aggregate fed out currently for, for example, every several minutes by multiplying the weight value by the velocity of the delivery belt.
  • an operational frequency of the vibrating feeder 13b is varied to change its frequency by the control unit, whereby the delivery amount of the aggregate, i.e., the supply amount thereof is fed back and controlled.
  • the three kinds of the aggregates such as two different size small stones, sand etc., for example, are fed in order to the first main belt conveyor unit 11 from the three continuous aggregate supply units 13 to 15 while the predetermined supply amount thereof per unit time is being controlled.
  • this continuous fixed amount supply unit 16 is provided with a screw shaft 16b arranged rotatably within the interior of a sleeve-like casing 16a.
  • This screw shaft 16b is rotated by a drive motor 16d installed on a base 16c.
  • a hopper 16e is provided above one end portion of the casing 16a.
  • An outlet portion on the lower side is connected to a cast port formed in the casing 16a.
  • the mortar or cement paste that has been introduced into the hopper 16e is introduced from the cast port of the casing 16a into the interior, extruded through the casing 16a by the rotating screw shaft 16b and fed onto the delivery belt through a supply pipe 16f from the other outlet.
  • a belt scale unit 17 is installed on the upstream side of the supply port of the supply pipe 16f.
  • this belt scale unit 17 has substantially the same as the above-described belt scale unit 13d, the explanation of the structure will be omitted. However, in operation, the unit is adapted to continuously detect the local weight of the delivery belt in the second main conveyor belt unit 12 moving carrying the three kinds of aggregates by a load cell (not shown) of the belt scale unit 17 and to output an electric signal to a control unit 18.
  • the control unit 18 continuously calculates, for example, the total supply amount of the three kinds of aggregates per unit time from the signals detected and outputted by the load cell, and calculates a more correct supply amount of the mortar per unit time from this calculation result. Then, in response to the total supply amount of the aggregates per unit time, the control unit 18 changes the rpm speed of the drive motor 16d to change the rotational speed of the screw shaft 16b to thereby control the supply of the mortar or cement paste.
  • One mixing box unit 20 is installed just below the delivery end of the second main belt conveyor unit 12.
  • Six, in total, two kinds of elements 21A and 21B are basically connected to each other in the vertical direction in this mixing box unit 20. For the sake of explanation, there is shown a state in which these two kinds of elements 21A and 21B are connected to each other.
  • each element 21A, 21B A specific structure of each element 21A, 21B will now be described. First of all, one of the elements 21A is provided at both ends with square end portions, and flanges F for connecting the elements to each other are formed at both the end portions.
  • a plurality of bolt holes fl are formed in these flanges F, F.
  • the adjacent elements are fixed at ends by bolts to each other and connected to each other by utilizing the bolt holes fl.
  • the element 21A is provided with two modified passages 22, 23 arranged in parallel in the same direction.
  • a partitioning wall 24 is formed in the central portion so as to form the longitudinal openings on the right and left sides at one end portion of this element 21A.
  • These right and left longitudinal openings are inlet portions 22a, 23a of the two modified passages 22, 23, respectively.
  • a partitioning wall 25 is provided in the center of the other end portion of the element 21A so as to form the horizontally extending openings on the upper and lower sides.
  • the horizontally extending upper and lower openings are respective outlet portions 22b and 23b of the two modified passages 22, 23. Namely, the partitioning wall 24 at the inlet end portion of the element 21A and the partitioning wall 25 at the outlet end portion of the element 21A are disposed at 90 degrees to each other.
  • the rectangular openings are formed in parallel on the right and left sides, whereas in the arrangement pattern of the two outlets 22b, 23b, the rectangular openings are formed in parallel on the upper and lower sides.
  • the specific shape of the modified passages 22, 23 will be described.
  • the respective modified passages 22, 23 are arranged with the respective cross-sectional shapes thereof being continuously varied toward the outlets 22b, 23b from the inlets 22a, 23a.
  • either of the modified passages 22, 23 has kept constant its cross-sectional area at any position but has changed only the shape in cross-section from the inlets 22a, 23a to the outlets 22b, 23b.
  • the inlets 22a, 23a have a longitudinal rectangular shape in an X-direction
  • the cross sectional shape is formed into a square in an intermediate-portion between the inlets 22a, 23a and the outlets 22b, 23b
  • the outlets 22b, 23b have a longitudinal rectangular shape in a Y-direction perpendicular to the X-direction (see Fig. 3).
  • the length of the modified passages 22, 23 is kept constant.
  • the object material to pass through the respective modified passages 22, 23 is changed in cross-sectional shape gradually from the longitudinal rectangular shape in the X-direction gradually to the square shape, and further to the longitudinal rectangular shape in the Y-direction, gradually.
  • this element 21A as viewed in Fig. 3, the inlet 22a located on the left side and the outlet 22b located in the upper side are in communication with each other through the modified passage 22, whereas the inlet 23a located on the right side and the outlet 23b located on the lower side are in communication with each other through the modified passage 23.
  • the other kind of element 21B has the same arrangement as that of the above-described element 21A.
  • this element 21B as viewed in Fig. 3, an inlet 26a located on the left side and an outlet 26b located in the lower side are in communication with each other through a modified passage 26, whereas an inlet 27a located on the right side and an outlet 27b located on the upper side are in communication with each other through a modified passage 27.
  • this element 21B has a different communication state from that of the element 21A with each inlet and each outlet of each modified passage.
  • Fig. 3 shows the condition where such two kinds of elements 21A and 21B are connected to each other. Namely, in the above-described two kinds of elements 21A and 21B, the inlet end portion of the one element 21B is connected to the outlet end portion of the other element 21A with the flanges F in intimate contact with each other with bolts.
  • the outlet 22b of the modified passage 22 in the one element 21A is in communication with the-half of the inlet 26a of the modified passage 26 and the half of the inlet 27a of the other modified passage 27 in the other element 21B
  • the outlet 23b of the modified passage 23 in the one element 21A is in communication with the rest half of the inlet 26a of the modified passage 26 and the rest half of the inlet 27a of the other modified passage 27 in the other element 21B.
  • each half of the object material to be mixed that has passed through each modified passage 22, 23 in the one element 21A is introduced into each modified passage 26, 27 of the other element 21B to be merged substantially.
  • the object material that has passed through one modified passage it is divided to each half at the joint portion of the two elements.
  • each outlet and each inlet of each modified passage formed in the outlet end portion and the inlet end portion that are the joint portion between the two elements 21A, 21B constitute the merging and dividing means of the object material.
  • the merging and dividing means for the object material is formed in each joint portion.
  • the aggregate and mortar transferred by the second belt conveyor unit 12 are dropped continuously into a hopper 19 from its delivery end.
  • the aggregate and mortar are roughly mixed when they are dropped from the second belt conveyor unit 12 into the hopper 19.
  • the aggregate and mortar are introduced from the two inlet portions 22a, 23a in the first element 21A of the mixing box unit 20 into each modified passage 22, 23 to drop into the mixing box unit 20 by the gravitational force.
  • Fig. 4 showing the process views.
  • these process views show in a model graphic manner the changing state of the object material, i.e., the aggregate and mortar in the regions of the inlet end portion, the intermediate portion and the outlet end portion of each element 21A, 21B in the case where the two elements 21A, 21B are connected to each other (in two stages).
  • each fluidized object material thus divided is in the form of a longitudinal rectangular shape in the X-direction.
  • the cross-sectional shapes of the fluidized object materials A, B are both changed into a square shape. Furthermore, the shapes are both changed into a rectangular shape long in the Y-direction at 90 degrees to the longitudinal direction X on the inlet side in the first stage outlet end portion. Accordingly, the cross-sectional shape of each fluidized object material A, B is changed from the rectangular shape long in the X-direction, to a square shape and to the rectangular shape long in the Y-direction.
  • the object materials A/B are caused to flow the respective modified passages 26 and 27, respectively. Namely, at the inlet end portion of the second stage element 21B, parts of the object materials A, B are merged into the respective modified passages 26, 27 and the cross-sectional shape of the fluidized object material within each passage is formed into a rectangular shape long in the X-direction.
  • the cross-sectional shapes of the fluidized object materials A/B are changed into a square shape as a whole and the shape is changed into the longitudinal rectangular shape in the Y-direction at the outlet end portion. Also, in the second stage, the object material A/B is changed from the longitudinal rectangular shape in the X-direction through the square shape into the longitudinal rectangular shape in the Y-direction.
  • the final object material at the second stage outlet end portion shown in Fig. 4 is divided on the right and left sides and merged into A/B/A/B as shown by the phantom line X1.
  • the object material at the stages afterward is kneaded in the same way as the first stage and the second stage.
  • the fluidized object material is caused to pass with almost no deformation. Then, even the plurality of elements 21A having the same shape are connectedif to each other, the condition as the modified passage is viewed from the end portion is not different from the condition shown in Fig. 5 at all. Accordingly, it is possible to predict the case where the kneading effect is not so attained even if the plurality of elements having the same shape are connected to each other.
  • the regions where the inlets 26a, 27a and the outlets 26b, 27b are overlapped with each other are the portions except for the hatched portions shown in Fig. 6. This is apparent unlike the element 21A, since the inlet 26a on the left side in the inlet end portion is in communication with the lower outlet 26b in the outlet end portion and the inlet 27a on the right side in the inlet end portion is in communication with the upper outlet 27b in the outlet end portion.
  • the elements used in the above-described embodiment are provided with the two modified passages 22, 23 or 26, 27.
  • the mixing box unit by connecting the elements 30 having four modified passages 31, 32, 33 and 34 as shown in Fig. 7.
  • this element 30 is the same as that of the elements 21A, 21B described above.
  • the element is also provided with square openings at the end portions and flanges F for connection around the openings. Furthermore, the inlet end portion is partitioned by means of three partitioning walls 35, 36, 37 so as to form four longitudinal openings in the X-direction to form inlets 31a, 32a, 33a, 34a of the four modified passages 31 to 34.
  • outlet end portion of the element 30 is partitioned so as to have longitudinal openings in the Y-direction different by 90 degrees from each inlet of the inlet end portion by three partitioning walls 38, 39, 40 to form outlets 31b, 32b, 33b, 34b of each modified passage.
  • the inlet 31a of the modified passage 31 is in communication with the second outlet 31b from above, the inlet 32a of the modified passage 32 is in communication with the uppermost outlet 32b, the inlet 33a of the modified passage 33 is in communication with the lowermost outlet 33b, and the inlet 34a of the modified passage 34 is in communication with the third outlet 34b from above.
  • each modified passage 31, 32, 33, 34 is basically the same as that of the elements 21A, 21B in the foregoing embodiment. However, the different point is that there are four modified passages in the contour of the element 30 as a whole.
  • Fig. 8 is a view showing a mixing method using the mixing box unit constituted by connecting the two elements 30 to each other (by connecting the elements 30 having the same shape in this example).
  • the object material that has been introduced into the inlets 31a to 34a longitudinal in the X-direction at the inlet end portions of the first stage element 30 is discharged from the outlets 31b to 34b, the object material is divided into B, A, D, C, and each row is merged in the condition of the sixteen layers longitudinal in the X-direction at the outlet end portions of the second stage element 30.
  • phantom lines X3 designate the next third division lines.
  • the suitably measured amount of aggregate and mortar or cement paste are continuously fed to the mixing box unit 20 to be mixed suitably, as a result of which very high quality concrete may be continuously produced.
  • the belt scale units are installed in the continuous frame material supply units 13 to 15 for producing a relatively high quality concrete as described above, supervising continuously the supply amount of the frame material and performing the feedback control. Also, in the same manner, the supply of the mortar is very accurately adjusted so as to be in proportion to the total amount of the frame material that has been delivered.
  • belt scale units may be suitably installed in response to the quality of the demanded concrete quality.
  • the material such as aggregate or mortar is caused to pass through the mixing box unit 20
  • the material is not always passed while filling the modified passage of each element. If the object material is not passed through the modified passage of each element while filling the modified passage, there is a fear that the material is not subjected to the shear or compression during the passage of the mixing box unit due to the difference of kinds of materials. As a result, there is a possibility that the difference occurs in kneaded condition.
  • an openable/closeable cut gate (not shown) is provided at the lowermost element outlet constituting the mixing box unit 20, and the discharge amount of the material dropping by the gravitational force is adjusted so as to more effectively perform the kneading and mixing under the control of the filling rate of the material in the modified passage in each element of the mixing box unit.
  • an amount (volume) of the aggregate per unit time that has been continuously fed by, for example, the delivery belt or the various well known means other than the belt scale unit as a means for adjusting a supply of the aggregate and mortar or cement paste may be detected in order by the plurality of photoelectric tube or it is possible to control the supply amount of the material by using a well known feed conveyor unit with high precision.
  • one kind or more kinds of materials are loaded and transferred so as to overlap in order on the delivery belt of the main conveyor unit. Furthermore, the final material is loaded on the delivery belt after determining the total amount of materials and these materials are cast into the mixing box unit.
  • the present invention is not limited thereto.
  • continuous aggregate supply units 13, 14, 15 and the continuous fixed amount supply unit 16 for feeding mortar or cement paste are provided independently around the hopper 19 installed in the upper portion of the mixing box unit 20 and each material may be cast continuously into the hopper 19 from each unit while metering the material. Then, a scale is installed in the delivery path from each continuous aggregate supply unit 13, 14, 15 and the continuous fixed amount supply unit 16 to the hopper 19, and the respective continuous aggregate supply units 13, 14, 15 and the continuous fixed amount supply unit 16 are subjected to the feedback control to thereby enhance the material supply precision as described above, if necessary.
  • the present invention is not limited to such materials. It is possible to cast the aggregate and the cement paste into the mixing box unit while continuously feeding and metering the materials, respectively.
  • the object material has been described by using the term of "aggregate".
  • the “aggregate” used here is not limited to the kinds independent of each other such as sand or small stone. Namely, the material obtained by mixing the sand and small stone in advance or the material obtained by further mixing the cement powder to the sand or small stone or the mixture thereof in advance is called a premix.
  • the “aggregate” also includes concept of such premix. Accordingly, it is possible to cast such premix into the mixing box unit while continuously metering and feeding the material.
  • two mixing box units 20 may be provided stepwise. Namely, the sand that is fine aggregate, the small stone that is the coarse aggregate and the cement powder are continuously fed by the metering and supply units 113, 114, 115 and mixed in the first stage mixing box unit 20 to manufacture the premix.
  • the management of the surface water of the coarse aggregate material or fine aggregate is needed in the case where the high quality concrete is to be manufactured, including the case where the water is to be added to the above-described premix. It is therefore preferable to add a water supply control unit or a moisture detecting means to the above-described continuous mixing plant according to the present invention, if necessary.
  • the plant is used for continuously producing the concrete.
  • the present invention may be applied to various cases where each material to be mixed is fed while being measured and is mixed and agitated continuously to obtain the product. It is possible to exemplify as such use the manufacture of mixed feed for domestic animals or gardening ground (mixed ground of ground and hen droppings).
  • the continuous mixing plant according to the present invention it is possible to perform this to the continuous manufacture of the concrete.
  • the metering of each material that has been conventionally difficult to perform in the continuous manufacture of the concrete may be continuously performed with high precision and the material is fed to the mixer having a special structure.
  • the high quality concrete may be manufactured continuously at a high speed.
  • the present invention is applicable to an apparatus for continuously mixing and agitating several kinds of materials, for example, for mixing cement and coarse aggregate in a concrete manufacturing plant or the like, mixing feed for domestic animals or mixing ground and hen droppings for producing gardening ground.

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  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Dispersion Chemistry (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Structural Engineering (AREA)
  • Preparation Of Clay, And Manufacture Of Mixtures Containing Clay Or Cement (AREA)
  • Apparatuses For Bulk Treatment Of Fruits And Vegetables And Apparatuses For Preparing Feeds (AREA)

Claims (10)

  1. Eine kontinuierliche Mischanlage mit kontinuierlichen Mess- und Zuführ-Mitteln zum anhaltenden Zuführen von zumindest zwei Arten von Materialien, die miteinander gemischt werden sollen, während die Materialien kontinuierlich gemessen werden, wobei die Zahl der kontinuierlichen Mess- und Zuführ-Mittel die zu den Materialien korrespondierende Zahl ist, und zumindest einer Mischboxeinheit zum Mischen der Materialien, die kontinuierlich von den kontinuierlichen Mess- und Zuführ-Mitteln zugeführt werden, dadurch charakterisiert, dass die Mischboxeinheit mit Folgendem zur Verfügung gestellt wird: eine Mehrzahl von modifizierten Durchgängen, von denen jeder einen Einlassteil an einem Ende und einen Auslassteil an dem anderen Ende hat, wobei deren Querschnittform sich kontinuierlich von dem Einlassteil zu dem Auslassteil verändert wird und wobei sie sich in axialer Richtung erstrecken; und Misch- und Teil-Mittel, die zwischen dem Einlassteil und dem Auslassteil von jedem der modifizierten Durchgänge zum Mischen und Teilen jedes Materials, das jeden der modifizierten Durchgänge passiert, zur Verfügung gestellt sind, und wobei jedes zu mischende Material kontinuierlich von dem Einlassteil ausgegossen wird und zu dem Auslassteil durch jeden der modifizierten Durchgänge aufgrund der Gravitationskraft passiert; wobei die Mischboxeinheit eine Mehrzahl von Elementen hat, die Elemente beinhalten zumindest zwei Arten, um den Kommunikationszustand zwischen jedem Einlass und jeden Auslass von jedem der modifizierten Durchgänge zu unterscheiden, und die Mischboxeinheit gebildet ist, indem die unterschiedlichen Arten der Elemente wechselweise miteinander verbunden werden.
  2. Die kontinuierliche Mischanlage gemäß Anspruch 1, dadurch gekennzeichnet, dass die Anlage weiterhin ein Messmittel beinhaltet, das zum lokalen Messen einer Liefermenge und - jede vorbestimmte Zeit im Mittel - zum kontinuierlichen Liefern des Materials dient, das von jeder der kontinuierlichen Mess- und Zuführ-Mittel zugeführt wird, und dass die kontinuierlichen Mess- und Zuführ-Mittel ein Signal von diesem Messmittel erhalten um durch Rückmeldungen kontrolliert zu werden, wobei die Genauigkeit der Materialbereitstellungsmenge verbessert wird.
  3. Die kontinuierliche Mischanlage gemäß Anspruch 2, dadurch gekennzeichnet, dass die zumindest zwei zu mischenden Materialien ein Zuschlagsstoff und Mörtel, oder Zement, sind und die Mischanlage als eine Anlage zum kontinuierlichen Herstellen von Beton verwendet wird.
  4. Die kontinuierliche Mischanlage gemäß Anspruch 1, wobei die kontinuierlichen Mess- und Zuführ-Mittel beinhalten: eine Hauptförderbandeinheit zum Liefern eines Zuschlagsstoffes; kontinuierliche Zuschlagsstoff-Zuführmittel zum anhaltenden Zuführen von zumindest einer Art von Zuschlagsstoff zu der Hauptförderbandeinheit während das Material gemessen wird; eine erste Detektionseinheit, die einem Förderband der Haupt-Förderbandeinheit nachgeordneten installiert ist, zum kontinuierlichen Messen einer lokalen Menge des Zuschlagsstoffes, die auf dem Förderband der Hauptförderbandeinheit transferiert wurden, an einer vorbestimmten Position, wobei ein Signal ausgegeben wird; kontinuierliche Festmengen-Bereitstellungsmitteln, die der Hauptförderbandeinheit nachgeordnet installiert ist, die den Zuschlagsstoff zugeführt hat, zum anhaltenden kontinuierlichen Zuführen einer festen Menge von Mörtel oder Zement zu der Hauptförderbandeinheit; wobei zumindest eine Mischboxeinheit direkt unterhalb eines Förderendes der Hauptförderbandeinheit angeordnet ist, dadurch gekennzeichnet, dass das kontinuierlichen Festmengen-Bereitstellungsmittel das Signal erhält, das kontinuierlich von der ersten Detektionseinheit ausgegeben wird, und durch Rückmeldung kontrolliert wird um die Genauigkeit der Bereitstellungsmenge an Mörtel oder Zement zu verbessern.
  5. Die kontinuierliche Mischanlage gemäß Anspruch 4, dadurch gekennzeichnet, dass die kontinuierlichen Zuschlagsstoff-Zuführmittel beinhalten: eine Förderbandeinheit zum Zuführen des Zuschlagsstoffes zu der Hauptförderbandeinheit; eine Material-Zerkleinerungs(Cutting)-Einheit zum kontinuierlichen Zuführen des Zuschlagsstoff zu der Förderbandeinheit; und eine zweite Detektionseinheit, die der Förderbandeinheit nachgeordneten installiert ist, sodass ein Signal ausgegeben wird indem an einer vorbestimmten Position eine Menge des Zuschlagsstoffes, der auf dem Förderband der Förderbandeinheit transferiert wird, kontinuierlich gemessen wird, wobei die Materialliefereinheit auf Empfang des kontinuierlichen Signals, das von der zweite Detektionseinheit ausgegeben wird, durch Rückmeldung kontrolliert wird, um dabei die Genauigkeit der Bereitstellungsmenge des Zuschlagsstoffes zu verbessern, der an die Förderbandeinheit geliefert und zugeführt wird.
  6. Die kontinuierliche Mischanlage gemäß Anspruch 5, dadurch gekennzeichnet, dass die Materialliefereinheit einen Vibrationszuführer enthält, und die Frequenz des Vibrationzuführers auf Basis des Signals, das kontinuierlich von der zweite Detektionseinheit ausgegeben wird, um durch Rückmeldung die Liefermenge des Zuschlagsstoffes zu der Förderbandeinheit zu kontrollieren, verändert wird.
  7. Die kontinuierliche Mischanlage gemäß Anspruch 6, dadurch gekennzeichnet, das eine oder beide der ersten und zweiten Detektionseinheiten aus einer Förderband-Maßeinheit aufgebaut ist, die zum kontinuierlichen Messen des Gewichts des Förderbandes und des darauf befindlichen Zuschlagsstoff an einer vorbestimmten Positionen dient.
  8. Die kontinuierliche Mischanlage gemäß Anspruch 7, dadurch gekennzeichnet, dass die Mischboxeinheit durch Verbinden einer Mehrzahl von Elementen in im wesentlichen vertikaler Richtung gebildet wird, wobei jedes der Elemente mit einem Einlassende, einem Auslassende und einer Mehrzahl von modifizierten Durchgängen zur Verfügung gestellt wird, die sich von dem Einlass zu dem Auslass erstrecken, und wobei der Einlass von jedem der an dem Einlassende geformten modifizierten Durchgänge und der Auslass von jedem der an dem Auslassende geformten modifizierten Durchgänge unterschiedliche Anordnungsmuster hat, und wobei weiterhin benachbarte Elemente mit direkten Kontakt zueinander an dem Auslassende und dem Einlassende verbunden sind, und ein Verbindungsteil zwischen dem Einlass und dem Auslass von jedem der modifizierten Durchgänge an dem Endteil der Verbindungsseite von jedem der Elemente die Mischund Teilmittel bildet.
  9. Die kontinuierliche Mischanlage gemäß Anspruch 8, dadurch gekennzeichnet, dass die Elemente mit rechteckigen Öffnungen zur Verfügung gestellt werden, die auf den rechten und linken Seiten als ein Anordnungsmuster des Einlasses der modifizierten Durchgänge angeordnet sind, und mit rechteckigen Öffnungen zur Verfügung gestellt werden, die vertikal als ein Anordnungsmuster des Auslasses der modifizierten Durchgänge angeordnet sind, und die gebildet sind durch zumindest zwei, im Kommunikationszustand zwischen jedem Einlass und jeden Auslass von jedem der modifizierten Durchgänge zu unterscheidenden Arten, und die Mischboxeinheit gebildet ist, indem die unterschiedlichen Arten der Elemente wechselweise miteinander in vertikaler Richtung verbunden werden.
  10. Die kontinuierliche Mischanlage gemäß Anspruch 9, dadurch gekennzeichnet, dass eine öffenbare/schließbare Öffnungssperre an dem Auslass des untersten Elements zur Verfügung gestellt wird, das die Mischboxeinheit bilden, und eine Auslassmenge von Material, das durch die Gravitationskraft fällt, reguliert wird, wobei eine Kontrolle der Füllrate des Materials in den modifizierten Durchgängen von jedem Element der Mischboxeinheit durchgeführt wird.
EP99973769A 1999-03-08 1999-03-08 Kontinuierliche mischanlage Expired - Lifetime EP1118380B1 (de)

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PCT/JP1999/001114 WO2000053302A1 (fr) 1997-09-24 1999-03-08 Installation de malaxage continu

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DE69917794D1 (de) 2004-07-08
EP1118380A1 (de) 2001-07-25
DE69917794T2 (de) 2005-07-14
KR20010043397A (ko) 2001-05-25
EP1118380A4 (de) 2002-01-23

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