JP4106127B2 - Ready-mixed concrete production plant - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a ready-mixed concrete manufacturing plant for manufacturing ready-mixed concrete by measuring and kneading various concrete materials such as gravel, sand, cement, water, and an admixture.
[0002]
[Prior art]
In a ready-mixed concrete production plant, gravel, sand, cement, water, and admixtures, which are concrete materials, are temporarily stored in a material storage tank arranged in the upper part of the plant, and each measuring tank arranged in the lower layer based on a shipping request. The various materials are weighed in predetermined amounts, and after weighing, the discharge gates at the bottom of each weighing tank are opened in order, the various materials are directly fed into the lower mixer, and kneaded for a predetermined time to produce ready-mixed concrete. At this time, in order to put various materials into the mixer, first, sand, cement and water are first introduced, and then gravel is introduced at regular intervals. This is because when the materials are added all at once, the mixing condition of the materials in the mixer deteriorates. Therefore, each material is kneaded uniformly by first kneading the mortar and mixing gravel into it.
[0003]
[Problems to be solved by the invention]
However, when materials are sequentially charged at regular time intervals as in the conventional case, a certain amount of time is taken for material loading. This kind of plant is always required to produce high-quality products quickly, but no matter how much the kneading performance of the mixer is improved, if this charging time is the same as before, the kneading time for one batch can be shortened to the limit. Therefore, the required high-performance plant cannot be realized.
[0004]
In view of the above points, an object of the present invention is to provide a ready-mixed concrete production plant capable of shortening a material charging time, shortening one batch of kneading time, and improving production capacity.
[0005]
[Means for Solving the Problems]
In order to achieve the above object, the present invention provides the ready-mixed concrete production plant according to claim 1, wherein various materials released from the measuring tank are kneaded below the measuring tank for measuring various concrete materials. In a ready-mixed concrete production plant including a single biaxial mixer having an opening for material input at the top, the taper is gradually tapered from the upper opening toward the lower opening between the weighing tank and the biaxial mixer. A premix chute for premixing various materials, which is formed in a substantially funnel shape, is arranged, and is arranged so that a substantially central portion of the upper opening of the biaxial mixer is directly below the lower opening of the premix chute. At the same time, a cement discharge pipe that discharges cement is located near the center of the lower opening of the premix chute, and other materials flow down along the inner wall of the premix chute. Configured to so that, and disposed the flow guide means for controlling the flow-down direction of the various concrete material in the premix the chute, and the cement was weighed, weighed sand, released around the same time at least one or more of gravel Then, it is characterized in that it is put into the mixer while being premixed in the premix chute.
[0006]
In the ready-mixed concrete manufacturing plant according to claim 2, the flow guiding means is configured to guide the flow of various concrete materials flowing down in the premix chute in a spiral manner .
[0008]
DETAILED DESCRIPTION OF THE INVENTION
According to engagement Ru raw concrete manufacturing plant to the present invention, when the raw concrete production, release and cement were weighed in the weighing chamber, the metering sand, to lower the premix chute at about the same time at least one or more of gravel, While premixed with a premix chute, it is put into a lower mixer and kneaded. In this way, the material is put into the mixer while premixing (primary mixing) with the premix chute, so when the material falls into the mixer, it is mixed to some extent, and the diffusion of the material in the mixer is fast, Mixing is also done quickly. Therefore, the premix chute can be used even if the gravel is thrown in during the sand, cement and water injection and the material input time is shortened without using the gravel after the sand, cement and water are added. The total kneading time of one batch can be shortened without prolonging the kneading time by the premixing effect.
[0009]
Also , during the production of ready-mixed concrete, when the cement is discharged from the cement discharge pipe facing the center of the lower opening of the premix chute and at the same time the gravel and sand flow down along the inner wall of the premix chute, the gravel and sand Falls into the mixer so as to wrap around the cement. In this way, if gravel and sand wrap around the cement and put into the mixer, the cement, gravel and sand will mix well, and the cement will not fall as a lump and go to the kneading shaft etc. Also less adherence.
[0010]
Further, since the arranged a flow guide means for controlling the flow-down direction of the material to flop Les mix the chute, gravel by the flow guide means, sand for example, when so as to flow down in a spiral, simply linearly falling material The effect of the premixing can be enhanced rather than making it.
[0011]
【Example】
Embodiments of the present invention will be described below with reference to the drawings.
[0012]
In the figure, reference numeral 1 denotes a plant body for producing ready-mixed concrete, in which equipments corresponding to the ready-mixed concrete manufacturing process are stacked on a foundation frame 2 as a multi-level hierarchical structure.
[0013]
The uppermost floor is a receiving chamber block 4 equipped with a distribution chute 3, which distributes various aggregates sent from the above-mentioned aggregate yard (not shown) via the conveying device 5 by the distribution chute 3, Each type of aggregate is put into the storage tank 7 arranged in the lower storage tank block 6. In addition to the aggregate, the storage tank block 6 is also provided with a cement pumped from a cement silo (not shown) and a storage tank (not shown) of kneaded water fed by a water pump (not shown). It is.
[0014]
A measuring tank block 8 is arranged below the storage tank block 6, and a gravel measuring tank 9, a sand measuring tank 10 and a cement measuring tank 11 are arranged in the measuring tank block 8. A measuring tank (not shown) for water and admixture is also provided.
[0015]
A mixer block 12 is disposed below the weighing tank block 8, and a mixer 13 for kneading various materials discharged from the respective weighing tanks is disposed in the mixer block 12. A concrete hopper 14 for temporarily storing ready-mixed concrete discharged from the mixer 13 is disposed at a lower portion of the mixer, and the temporarily stored ready-mixed concrete is appropriately selected by opening and closing a flexible gate rubber 15 disposed under the concrete hopper 14. Discharged.
[0016]
A premix chute 16 for premixing sand, gravel and cement discharged from the weighing tank is disposed between the weighing tank and the mixer 13, and the premix chute 16 is shown in FIGS. As shown in FIG. 4, a cylindrical body 19 having an upper opening 17 and a lower opening 18 and having a substantially funnel shape tapered from the upper opening 17 toward the lower opening 18, and having the lower opening 18 opened at the lower end thereof. It has.
[0017]
The cylindrical body 19 collects sand, gravel, and cement and guides them to the mixer 13. The inner diameter and length of the cylindrical body 19 are sand, gravel flowing down along the premix chute 16 and the cement discharge pipe 20. The size is such that the cement is mixed and quickly dropped into the lower mixer 13 and is designed appropriately according to the plant capacity.
[0018]
The upper opening 17 faces the gravel measuring tank 9 and the lower part of the sand measuring tank 10, and the lower opening 18 of the cylindrical body 19 faces almost the center of the lower mixer 13. Further, the cement discharge pipe 20 is extended from the cement metering tank 11 so that the tip thereof faces the vicinity of the center of the lower opening 18.
[0019]
4 and 5 show another embodiment of the premix chute 16, and in order to increase the effect of mixing in the premix chute 16, the material of the inner wall of the cylindrical body 19 below the premix chute 16 is shown. As flow guide means for controlling the flow direction, the guide vanes 21 are arranged in a spiral shape, and the material passing through the cylindrical body 19 is caused to flow down in a spiral shape so that the materials are mixed. FIG. 6 shows another embodiment of the present invention, which includes a guide blade 22 that continues from the upper part to the lower part of the cylindrical body 19.
[0020]
FIGS. 7 and 8 show another embodiment of the premix chute 16 in which a guide plate 23 is formed to guide the flow of the material flowing down along the inner wall of the premix chute 16 in a spiral shape. is there. In addition, instead of the guide plate 23, the flow of the material flowing down with a dent can be guided in a spiral shape.
[0021]
Thus, when producing ready-mixed concrete using the above-described ready-mixed concrete manufacturing plant, gravel and sand are fed into the storage tank 7 disposed in the storage tank block 6, and other materials such as cement and water are fed into another storage tank.
[0022]
When there is a shipment request from the shipping site, gravel and sand stored in the storage tank 7 are discharged to the gravel measurement tank 9 and sand measurement tank 10 arranged in the measurement tank block 8 and weighed, and cement is also used. It dispenses to the cement measuring tank 11 and weighs it, and also measures a predetermined amount of water and admixture.
[0023]
When the measurement of each material is completed, for example, as shown in the material input time chart of FIG. 9, the various measured materials are released almost at the same time. In this time chart, sand and water are released at the same time, and cement and gravel are released after 2 seconds. The start time of the gravel is about 15 to 20 seconds. Yes. In this time chart, there is a place where the release of sand, cement and gravel overlaps, and gravel, sand and cement flow down in the premix chute 16 at the same time, and are put into the mixer 13 while being premixed.
[0024]
It should be noted that the release start and release completion of various materials such as gravel, sand, and cement may have a slight time difference. However, if the release timing of cement overlaps with at least one kind of gravel and sand, the premix chute 16 The effect of the premixing at the same time is exerted, but it is possible to shorten the charging time by preferably making the gravel, sand and cement release times overlap. The water and the admixture are directly fed into the mixer 13 without passing through the premix chute 16.
[0025]
When releasing the material, if the cement discharge pipe 20 is placed near the center of the premix chute 16, gravel and sand will flow around the discharged cement, and the mixer will be wrapped with gravel and sand. 13, the mixing of the cement, gravel and sand is improved, and the cement does not fall as a lump and is less adhered to the kneading shaft or the like.
[0026]
Thus, kneading is started when the material premixed in the premix chute 16 is dropped onto the mixer 13, but gravel, sand, and cement are mixed to some extent when the premix chute 16 passes or falls onto the mixer 13. Therefore, it is possible to shorten the kneading time of one batch without increasing the time until kneading even though the material is put into the mixer 13 in a short time, and the production capacity can be improved.
[0027]
As shown in FIGS. 4 to 6, when the guide blades 21 and 22 are arranged on the cylindrical body 19 of the premix chute 16 as the flow guide means, gravel and sand are introduced into the guide blade 21 in the cylindrical body 19. It flows down spirally along the line 22 and mixes well with the cement discharged from the cement discharge pipe 20 and contributes to quick kneading in the mixer 13.
[0028]
Further, when a spiral guide plate 23 is disposed on the inner wall of the premix chute 16 as shown in FIGS. 7 to 8, when the gravel and sand flow down the premix chute 16, the spiral flow flows into the gravel and sand. It becomes easy to flow into the lower cylindrical body 19 in a spiral manner, and the mixing of gravel, sand and cement can be promoted as described above.
[0029]
In addition, in the Example, the premix chute 16 was arrange | positioned in the gravel measuring tank 9, the sand measuring tank 10, and the cement measuring tank 11, and the example which discharge | released the measured gravel, sand, and cement in the premix chute 16 was shown. However, for example, gravel measured in the gravel measuring tank 9 does not pass through the premix chute 16 and is directly fed into the mixer 13, and only sand and cement are passed through the premix chute 16 and premixed. Sand or cement may be directly fed into the mixer 13 while being discharged into the premix chute 16, or in short, the premix chute 16 may be premixed with at least one kind of gravel or sand and cement. Of course, there may be a slight time difference between the start of material release.
[0030]
In the above-described embodiment, the guide blades 21 and 22 and the guide plate 23 are individually used. However, the present invention is not limited to this, and they may be combined with each other, and the gist of the present invention. Other flow guide means may be adopted in place of the guide vanes 21 and 22 and the guide plate 23 within a range not departing from the above.
[0031]
【The invention's effect】
As described above, in the ready-mixed concrete manufacturing plant according to claim 1 according to the present invention, various materials discharged from the measuring tank are kneaded below the measuring tank for measuring various concrete materials, and the material is charged into the upper part. In a ready-mixed concrete production plant comprising a single biaxial mixer having an opening for use, between the weighing tank and the biaxial mixer, a substantially funnel shape that gradually tapers from an upper opening toward a lower opening. A premix chute for premixing various materials formed is arranged, arranged so that a substantially central portion of the upper opening of the biaxial mixer is located directly below the lower opening of the premix chute, and A cement discharge pipe that discharges cement is faced near the center of the lower opening of the premix chute, and other materials can flow along the inner wall of the premix chute. And, and arranged a flow guide means for controlling the flow-down direction of the various concrete materials in the premix the chute, and the cement was weighed, pre-mix metering sand, gravel of at least one or more of them released around the same time Since it is put into the mixer while premixing in the chute, the material charging time can be shortened, and the kneading time of one batch can be shortened without prolonging the kneading time by premixing. Can be increased. In addition, the cement is put into the mixer so as to be encased in gravel and sand, and the cement, gravel and sand are mixed well, and the cement does not fall as a lump and is less likely to adhere to the kneading shaft. Become. In addition, the effect of the premixing can be enhanced more than when the material flows down spirally along the inner wall of the premix chute and the material flows down linearly.
[0032]
Further, in the ready-mixed concrete manufacturing plant according to claim 2, the flow guide means, so to constitute a flow of various concrete material flowing down the premix the chute so as to be guided in a spiral, simply linearly material It is possible to enhance the effect of the premixing rather than letting it flow down.
[Brief description of the drawings]
FIG. 1 is an explanatory diagram showing an embodiment of a ready-mixed concrete production plant according to the present invention.
FIG. 2 is an enlarged view of a main part of FIG.
FIG. 3 is a plan view of FIG. 2;
FIG. 4 is an enlarged view of a main part corresponding to FIG. 2 of another embodiment.
FIG. 5 is a plan view of FIG. 4;
FIG. 6 is an enlarged view of a main part corresponding to FIG. 2 of another embodiment.
FIG. 7 is an enlarged view of a main part corresponding to FIG. 2 of another embodiment.
8 is a plan view of FIG. 7. FIG. 9 is a diagram showing an example of a time chart of material input in the ready-mixed concrete production plant according to the present invention.
[Explanation of sign]
DESCRIPTION OF SYMBOLS 1 ... Plant main body 7 ... Storage tank 9 ... Gravel measuring tank 10 ... Sand measuring tank 11 ... Cement measuring tank 13 ... Mixer 16 ... Premix chute 17 ... Upper opening 18 ... Lower opening 19 ... Cylindrical body 20 ... Cement discharge pipe 21 ... guide vane 22 ... guide vane 23 ... guide plate

Claims (2)

In a ready-mixed concrete manufacturing plant comprising a single biaxial mixer having an opening for material addition at the top, kneading various materials released from the weighing tank below a measuring tank for weighing various concrete materials, A premix chute for premixing various materials, which is formed in a substantially funnel shape gradually tapered from the upper opening toward the lower opening, is disposed between the measuring tank and the biaxial mixer. Arranged so that the substantially central part of the upper opening of the biaxial mixer comes directly under the lower opening of the chute, and faces a cement discharge pipe that emits cement near the central part of the lower opening of the premix chute, other materials configured to flow down along the inner wall of the premix chute, and the premix chute for controlling the flow-down direction of the various concrete material Disposed guide means is, features and cement were weighed, weighed sand, that as gravel least one or more of them released around the same time put into the mixer while premixed in a premix chute Ready-mixed concrete production plant. 2. The ready-mixed concrete manufacturing plant according to claim 1 , wherein the flow guiding means is configured to guide the flow of various concrete materials flowing down in the premix chute in a spiral shape .

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