JP5429971B2 - Ready-mixed concrete production plant - Google Patents

Description

  The present invention relates to a ready-mixed concrete manufacturing plant that manufactures ready-mixed concrete by kneading various materials such as gravel, sand, cement, water, and an admixture.

  When preparing ready-mixed concrete in a ready-mixed concrete manufacturing plant, gravel, sand, cement, water, and admixture are measured in a measuring tank according to the desired concrete mix. It has the property of easily foaming, and bubbles are likely to be generated in the water metering tank in which the admixture is mixed or in the tank of the admixture metering tank, and sometimes the foam overflows out of the tank and contaminates the surroundings. Therefore, in Patent Document 1 (Japanese Patent Application Laid-Open No. 2000-301529), the tip of the fine metering water pipe among the coarse metering water pipe and the fine metering water pipe for feeding the water in the water tank into the water metering tank by gravity drop. A watering nozzle that discharges water in the form of a shower is attached to the water metering tank to prevent foaming of the admixture in the water measuring tank.

JP 2000-301529 A

  However, in the configuration in which a watering nozzle is attached to the tip of the fine metering water pipe that discharges water little by little as described above, and the water is discharged in a shower-like manner by gravity drop, the bubbles in the water metering tank can be erased as such. However, it is expected that the foam-erasing effect is small due to the small amount of water released and the gravity drop. Moreover, although the foam in a water measuring tank is erase | eliminated, the foam which generate | occur | produces in an admixture measuring tank is not performed.

  This invention makes it a subject to provide the ready-mixed concrete manufacturing plant which can suppress the foaming of the admixture in an admixture measuring tank and a water measuring tank as much as possible in view of said point.

  In order to solve the above problems, in the ready-mixed concrete manufacturing plant according to claim 1 according to the present invention, various materials such as gravel, sand, cement, water, and an admixture are measured in a measuring tank, and the measured materials are mixed with a mixer. In a ready-mixed concrete production plant for producing ready-mixed concrete by mixing in, a watering nozzle disposed facing the admixture metering tank, a watering nozzle disposed facing the water-measuring tank, and each of the above-mentioned watering A water supply control valve for controlling water supply to the nozzle and a water supply pump for supplying water from the water storage tank to the watering nozzle are provided.

Further, in the ready-mixed concrete production plant according to claim 2, the water supply control valve of the watering nozzle of the admixture metering tank is opened immediately before the admixture discharge from the admixture metering tank and is closed after the admixture discharge is completed. It is characterized in controlled Rukoto to perform defoaming and cleaning in agent measuring tank.

Further, in the ready- mixed concrete production plant according to claim 3, the water supply control valve of the watering nozzle of the water metering tank is used to measure the amount of admixture from the water coarse metering and the admixture metering tank. after the addition, water was released into the water fine metering of small portions put, by clogging in the water fine metering is controlled to perform the defoaming in the water measuring tank is characterized in Rukoto.

  According to the ready-mixed concrete manufacturing plant according to claim 1 of the present invention, a watering nozzle disposed facing the admixture metering tank, a watering nozzle disposed facing the water metering tank, A water supply control valve for controlling water supply to the watering nozzle and a water supply pump for supplying water from the water storage tank to the watering nozzle are provided. Water can be jetted to the adsorbent and foaming of the admixture can be suppressed.

According to the ready-mixed concrete production plant of claim 2, the water supply control valve of the watering nozzle of the admixture metering tank is opened immediately before the admixture discharge from the admixture metering tank, and is closed after the admixture discharge is completed. controlled to perform defoaming and cleaning admixtures metering tank Te been Runode, it is possible to perform defoaming and cleaning admixtures weighing vessel efficiently.

Moreover, according to the ready- mixed concrete production plant of claim 3, the water supply control valve of the watering nozzle of the water metering tank is used for the coarse water metering and the mixing from the admixture metering tank. after introduction of agent, the water released into the water fine metering of small portions charged, water finely metered in occluded to be controlled to perform the defoaming in the water measuring tank Runode, foam water metering tank Erasing can be performed effectively.

It is a schematic explanatory drawing of the admixture measuring tank and water measuring tank vicinity which show one Example of the ready-mixed concrete manufacturing plant which concerns on this invention. It is a flowchart which shows the foam elimination procedure of an admixture measurement tank. It is a flowchart which shows the foam elimination procedure of a water measuring tank.

  In the ready-mixed concrete production plant according to the present invention, the watering nozzle is disposed so as to face the admixture metering tank, and the watering nozzle is disposed so as to face the water metering tank. A water supply control valve for controlling water supply to the water supply and a water supply pump for supplying water from the water storage tank to the watering nozzle are disposed.

  The water supply control valve of the watering nozzle of the admixture metering tank is controlled to be opened immediately before the admixture discharge from the admixture metering tank and closed after the admixture discharge is completed. Moreover, the water supply control valve of the watering nozzle of the water metering tank is controlled so as to be opened and closed so as to eliminate bubbles in the water metering tank during the fine water metering.

  In the admixture metering tank, before the measured admixture is released, the water supply control valve is opened and the water supply pump is driven, so that the water is extensively showered from the watering nozzle into the admixture metering tank. The foam is blown out in the tank. Subsequently, when the admixture is discharged, the admixture is washed away by the water continuously sprayed from the watering nozzle, and the inside of the tank is cleaned cleanly.

  Moreover, in the water measurement tank, when the water rough measurement in which a large amount of water is introduced is completed, the admixture is released from the admixture measurement tank and is introduced into the water measurement tank, thereby foaming the inside of the tank. Subsequently, when fine metering of water is started little by little, the water supply control valve of the watering nozzle is opened and water is sprayed in a wide area in the form of a shower toward the water metering tank, so that the foam in the tank disappears. Done. Water injection from this watering nozzle is stopped during fine metering.

  In this way, foaming of the admixture in the admixture metering tank and the water metering tank is effectively suppressed by injecting water into the admixture metering tank and the water metering tank in a timely manner while being pressurized by the water supply pump. be able to.

  Hereinafter, an embodiment of the present invention will be described with reference to the drawings.

  Reference numeral 1 in FIG. 1 denotes an admixture metering tank provided in the ready-mixed concrete production plant, which is supported by the load cell 2 and measures admixtures such as an AE agent and an AE water reducing agent. The admixture metering tank 1 is faced with an admixture supply pipe 3, and a control valve 4 for controlling the supply of the admixture is arranged in the middle of the supply pipe 3, while the admixture metering tank 1 is provided with a cylinder 5. A discharge valve 6 for opening and closing the discharge port is provided.

  A water measuring tank 8 supported by a load cell 7 is arranged below the admixture measuring tank 1, and the water measuring tank 8 has a pipe diameter for supplying a large amount of water in the upper water storage tank 9. A thick coarse metering water pipe 10 and a fine metering water pipe 11 with a small diameter for introducing a small amount of water are allowed to face, and each of the water pipes 10, 11 has a control valve 12, 13 for controlling the supply of water. On the other hand, a control valve 14 for water discharge is provided at the lower part of the water measuring tank 8.

  In addition, a watering nozzle 15 is disposed facing the admixture metering tank 1, while a watering nozzle 16 is disposed facing the water metering tank 8, and the watering nozzles 15, 16 are connected by a pipe 17. A water regulator 19 that can be connected to a water supply pump 18 in the water storage tank 9 and can adjust the pressure and flow rate in the middle of the pipe 17 and a water supply control valve 20 that controls the supply of water to the water spray nozzles 15 and 16. 21 are disposed. It should be noted that the watering nozzles 15 and 16 may be appropriately attached so that water can be sprayed over a wide area in the admixture metering tank 1 and the water metering tank 8.

  The water supply control valve 20 of the watering nozzle 15 of the admixture metering tank 1 is controlled to be opened immediately before the admixture discharge from the admixture metering tank 1 and closed after the admixture discharge is completed. The water supply control valve 21 of the eight watering nozzles 16 is controlled to be opened and closed so as to eliminate bubbles in the water metering tank 8 during fine water metering. The water supply pump 18 is driven when any of the water supply control valves 20 and 21 is opened.

  FIGS. 2 and 3 are flow charts showing a procedure for defoaming the admixture metering tank 1 and the water metering tank 8, and this procedure is programmed in a control device (not shown). The bubble elimination procedure will be described based on this flowchart. In addition, S1-S18 in a figure represents each step.

  FIG. 2 shows a defoaming procedure for the admixture metering tank 1, and defoaming is performed when the admixture weighed in the admixture metering tank 1 is released. In addition, by providing an admixture discharge waiting timer and a watering nozzle injection timer, the admixture discharge timing and watering time can be arbitrarily set.

  First, after a predetermined amount of admixture has been weighed in the admixture measurement tank 1, when an admixture release signal is transmitted (S1), an admixture release waiting timer (for example, 2 to 3 seconds) is started (S2). At the same time, a watering nozzle injection timer (for example, 10 seconds) is started (S3). At the same time, the control valve 20 is opened while the water supply pump 18 is driven, and water is sprayed from the water spray nozzle 15 in a shower-like manner to eliminate bubbles in the admixture metering tank 1 (S4).

  If the admixture release waiting timer expires (S5), the release valve 6 of the admixture metering tank 1 is opened to start releasing the admixture (S6). At this time, watering from the watering nozzle 15 continues, and the admixture is poured into the water metering tank 8 and at the same time, the admixture metering tank 1 is cleaned. If the water spray nozzle injection timer expires (S7), the control valve 20 is closed to stop water spraying from the water spray nozzle 15 (S8), and the foam erasing / washing in the admixture metering tank 1 is completed. The defoaming / washing in the admixture metering tank 1 is repeated every time the admixture is metered / released.

  FIG. 3 shows a foam elimination procedure for the water metering tank 8. In the water metering tank 8, the foam is erased when water is metered. In addition, the watering time can be arbitrarily set by providing the watering nozzle injection timer.

  First, the control valve 12 of the coarse metering water pipe 10 having a large pipe diameter is opened in the water metering tank 8 to start the coarse metering of water (S9), and the metered value of the water reaches 90% of the metering set value. When it reaches, the control valve 12 is closed to complete the coarse water metering (S10), and then the admixture released from the admixture metering tank 1 is put into the water metering tank 8 (S11). Subsequently, a water fine metering start signal is transmitted (S12), the control valve 13 of the fine metering water pipe 11 having a small pipe diameter is opened to start fine metering of water (S13), and a water spray nozzle injection timer (for example, 2). ~ 3 seconds) is started (S14), the control valve 21 is opened, watering is started from the watering nozzle 16, and the foam in the water metering tank 8 is erased (S15).

  And if a water spray nozzle injection timer expires (S16), the control valve 21 will be obstruct | occluded and water spraying from the water spray nozzle 16 will be stopped, and foam elimination will be completed (S17). Subsequently, when the water measurement value reaches the measurement set value, the control valve 13 of the fine measurement water pipe 11 is closed to stop the water fine measurement (S18), and the water measurement is completed. The defoaming in the water measuring tank 8 is repeated every time water is measured.

  Thus, in the admixture metering tank 1 and the water metering tank 8, the water supply pump 18 pressurizes the water from the spray nozzles 15 and 16 over a wide area in a shower-like manner, thereby allowing the admixture in the tank to be mixed. Bubbles can be suppressed, and bubbles do not overflow outside the tank.

  In addition, in the admixture metering tank 1, watering from the watering nozzle 15 is started immediately before the admixture discharge and is completed after the admixture discharge is completed, thereby eliminating foam in the admixture measuring tank 1 and washing after the admixture discharge. It can be done efficiently.

  Furthermore, in the water metering tank 8, by adding the admixture after the rough metering in which the water is vigorously charged, the foaming of the admixture is reduced as much as possible. Elimination of bubbles in 8 can be performed efficiently.

DESCRIPTION OF SYMBOLS 1 ... Admixture measuring tank 6 ... Release valve 8 ... Water measuring tank 9 ... Water storage tank 10 ... Coarse measuring water piping 11 ... Fine measuring water piping 15, 16 ... Sprinkling nozzle 17 ... Piping 18 ... Water supply pump 19 ... Water regulator 20, 21 ... Control valve for water supply

Claims (3)

  Gravel, sand, cement, water, admixture materials are weighed in a measuring tank, and the measured materials are kneaded in a mixer to produce ready-mixed concrete. The watering nozzle disposed in the water measuring tank, the water supply control valve for controlling the water supply to each watering nozzle, and the water in the water tank are supplied to the watering nozzle. A ready-mixed concrete production plant comprising a water supply pump. The control valve for water supply of the watering nozzle of the admixture metering tank is opened just before the admixture discharge from the admixture metering tank, and is closed after the admixture discharge is completed so that the foam in the admixture metering tank is erased and washed. controlled mixed concrete manufacturing plant according to claim 1, wherein Rukoto. The water supply control valve of the water metering nozzle of the water metering tank is used for coarse water metering to add a large amount of water into the water metering tank and fine water metering to add water in small quantities after the admixture from the admixture metering tank is added. ready-mixed concrete manufacturing plant according to claim 1 or 2, wherein open and occluded in the water fine metering is controlled to perform the defoaming in the water measuring tank, characterized in Rukoto to.

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