JPH11268030A - Method and device for introducing kneading water for ready mixed concrete manufacturing plant - Google Patents

Abstract

PROBLEM TO BE SOLVED: To meter primary water and secondary water at a time and introduce the desired divided volume of the primary water and the secondary water by the given periods. SOLUTION: When kneading water is metered, the preset water volume of primary water and secondary water in one water metering tank is metered. When the primary introduction period comes around, the metered water in a water metering tank 1 is discharged and simultaneously the discharge volume is sensed, and when the discharge volume reaches the preset primary water volume, the discharge of water is discontinued to complete the discharge of primary water. Also when the secondary water introduction period comes around, metered water remaining in the water metering tank 1 is discharged as the secondary water.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method and an apparatus for introducing mixed water in a ready-mixed concrete production plant for measuring and kneading various concrete materials such as gravel, sand, cement, water and an admixture to produce ready-mixed concrete.

[0002]

2. Description of the Related Art In the production of ready-mixed concrete, pre-measured gravel, sand, cement, water, and an admixture are continuously introduced into a mixer at predetermined time intervals and kneaded. In order to obtain higher quality concrete,
The kneading water is divided into two parts, primary and secondary, and the mortar is manufactured by adding sand, cement and primary water during the primary charging time, and then the gravel and secondary water are added. A method for producing ready-mixed concrete has been proposed.

[0003] As one example, Japanese Patent Application Laid-Open No. 9-20
As shown in Japanese Patent Publication No. 1817, primary water and secondary water are measured by the same water measuring tank. At the time of charging the primary water, the primary water is first measured and charged into a mixer. In some cases, the secondary water is weighed and charged into a mixer when the next water is charged.

[0004]

However, as in the prior art described above, each time the primary water and the secondary water are charged,
In the method of measuring the kneading water in the water tank and putting it into the mixer,
The number of times of weighing becomes two, and there is room for further improvement from the viewpoint of shortening the weighing time and reducing the weighing error.

In view of the above, the present invention provides a ready-mixed concrete in which primary water and secondary water are measured only once, and a desired amount of primary water and secondary water can be dividedly charged at a predetermined time. An object of the present invention is to provide a method and an apparatus for charging kneading water in a manufacturing plant.

[0006]

SUMMARY OF THE INVENTION In order to achieve the above-mentioned object, the present invention provides a water measuring tank provided with a weight detector, which is provided with a water measuring valve and a water discharging valve, while setting a primary water amount. With a water amount setting device, and a secondary water amount setting device for setting the secondary water amount, the total amount of the primary water amount and the secondary water amount set in the primary water amount setting device and the secondary water amount setting device at the time of kneading water measurement. A measuring comparator that compares the measured water amount, a measuring controller that opens and closes the water measuring valve according to the signal from the measuring comparator, and a setting of the amount of water discharged from the water measuring tank and the primary water amount setting device when the primary water is charged A water discharge comparator that compares the amount of water and a water discharge valve that controls the opening and closing of the water discharge valve with a signal from the water discharge comparator, and discharges residual water remaining in the water measuring tank as secondary water at the time of secondary water injection. It is characterized by having a water discharge controller for controlling opening and closing.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS According to the kneading water charging method and apparatus according to the present invention, the amount of primary water and the amount of secondary water to be charged via a primary water amount setting device and a secondary water amount setting device are set in advance. Then, the total amount of the primary water amount and the secondary water amount is measured at one time in the water measuring tank via the measuring comparator and the measuring controller.
Then, at the time of primary water injection, the water discharge valve is opened via the water discharge controller to start water discharge, and at the same time, the water discharge amount is detected by the weight detector, and the detected water discharge amount is compared with the preset primary water amount. When the water discharge amount matches the set primary water amount, the water discharge valve is closed via the water discharge controller to complete the supply of the primary water. Further, at the time of charging secondary water, the water discharge valve is opened again via the water discharge controller, and the kneading water remaining in the water measuring tank is discharged as secondary water and charged into the mixer.

[0008]

An embodiment of the present invention will be described below with reference to the drawings.

In the figure, reference numeral 1 denotes a water measuring tank provided in a ready-mixed concrete production plant, and a weight detector 2 for detecting the weight of the water to be measured is provided in the main body of the water measuring tank 1. A water supply pipe 3 for discharging kneading water from an upper water tank (not shown) when measuring the kneading water in the upper opening.
The water supply pipe 3 is provided with a water metering valve 4 for controlling the amount of water to be discharged. In addition, a water discharge control valve 6 for discharging the measured water in the water measuring tank 1 to the lower mixer 5 is provided below the water measuring tank 1.

Reference numeral 7 denotes a primary water amount setting device for inputting and setting a primary water amount, and reference numeral 8 denotes a secondary water amount setting device for inputting and setting a secondary water amount. Reference numeral 9 denotes a measuring comparator, which compares the measuring water amount measured by the water setting tank 1 with the setting device at the time of measuring. Reference numeral 10 denotes a measurement controller that controls the opening and closing of the water measurement valve 4 in response to a signal from the measurement comparator. Also,
Reference numeral 11 denotes a water discharge comparator for comparing the amount of water discharged from the water measuring tank 1 at the time of water discharge. Reference numeral 12 denotes a water discharge controller which receives a signal from the water discharge comparator 11 and controls opening and closing of the water discharge valve 6. And the weight signal detector 2
The output signal is amplified by an amplifier 13, and the amplified signal is output from the weighing comparator 9 and the water discharge comparator 11.
To be entered.

Next, a procedure for introducing kneading water by the above-mentioned water charging device will be described with reference to a flowchart of FIG. S1 to S22 in the figure show each step of the kneading water charging procedure.

First, before the kneading water is supplied, an input setting of a primary water amount is performed as an initial setting by a primary water amount setting device 7 (S1), and an input setting of a secondary water amount is performed by a secondary water amount setting device 8 (S1). S2).

By the metering start operation (S3), the set values of the primary water amount and the secondary water amount are summed (S4), the water metering valve 4 is opened via the metering controller 10 (S5), and the mixing water is mixed. The payout is started (S6). When the mixing water is discharged from the water storage tank to the water measuring tank 1, the weight of the mixing water discharged by the weight detector 2 of the water measuring tank 1 is detected as a measured water amount (S7). Then, the measuring comparator 9 compares the measured water amount with the total value of the preset primary water amount and the secondary water amount (S8), and the measured water amount is obtained by subtracting a difference between the total amount (actually, the total value and the total difference). Value) or not (S
9) If the total value has not been reached, the measurement of the kneading water is continued. If the total value is reached, the water measuring valve 4 is closed via the measuring controller 10 (S10), and the measuring of the kneading water is terminated (S1).
1).

Next, it is determined whether or not it is the time for charging the primary water (S12). If it is not yet, the charging time is awaited. When the time for charging is reached, the water discharge valve 6 is opened via the water discharge controller 12 (S13). The discharge of the primary water is started (S14). Simultaneously with the discharge of the primary water, the amount of water discharged is detected by the weight detector 2 (S15), and the amount of discharged water is compared with the set amount of primary water by the water discharge comparator 11 (S16). Is determined (S17),
If the primary water amount has not been reached yet, the water discharge is continued. If the primary water amount is reached, the water discharge valve 6 is closed via the water discharge controller 12 (S1).
8), the discharge of the primary water is stopped (S19).

Next, it is determined whether or not it is time to supply secondary water,
(S20) If not, the charging time is waited. When the charging time comes, the water discharge valve 6 is opened again via the water discharge controller 12 (S21), and the kneading water remaining in the water measuring tank 1 is returned. Is discharged as secondary water (S22). In this way, the discharge of the kneading water for one batch is completed, and when the kneading is continued, the process returns to step S3 or S1, and the following procedure is repeated to measure and discharge the kneading water.

[0016]

As described above, in the kneading water charging method and apparatus according to the present invention, the total water amount of the primary water amount and the secondary water amount set in advance by one water measuring tank at the start of the measurement is measured. However, during the primary water charging time, the amount of water discharged from the water measuring tank is detected, and when the detected water discharging amount reaches the preset primary water amount, the water discharging from the water measuring tank is stopped. Since the measured water remaining in the water measuring tank is discharged as secondary water, the measurement of the primary water and the secondary water can be completed at one time, and the desired amounts of the primary water and the secondary water can be obtained. Since it can be dividedly charged at a predetermined time, the time at the time of weighing can be reduced and the weighing error can be minimized.

[Brief description of the drawings]

FIG. 1 is an explanatory diagram showing a configuration of a kneading water charging device according to the present invention.

FIG. 2 is a flowchart showing a procedure of a kneading water charging method according to the present invention.

[Description of sign]

DESCRIPTION OF SYMBOLS 1 ... Water measuring tank 2 ... Weight detector 4 ... Water measuring valve 5 ... Mixer 6 ... Water discharge valve 7 ... Primary water amount setting device 8 ... Secondary water amount setting device 9 ... Measuring comparator 10 ... Measuring controller 11 ... Water discharging comparator 12 ... water discharge controller

Claims (2)

[Claims] In a method for feeding kneading water in a ready-mixed concrete production plant in which kneading water during kneading of ready-mixed concrete is divided into two parts, primary and secondary, the primary water amount and the secondary water amount are set in advance. At the time of kneading water measurement, the total water amount of the primary water amount and the secondary water amount is measured at a time by one water measuring tank, and at the time of primary water charging, the amount of water discharged from the water measuring tank is detected and the detected discharge amount is measured. When the amount of water reaches a preset primary water amount, water discharge from the water measuring tank is stopped, and at the time of secondary water charging, the measured water remaining in the water measuring tank is discharged as secondary water. Mixing water injection method for ready-mixed concrete production plant. 2. A water measuring valve having a weight detector and a water measuring valve and a water discharging valve, and a primary water amount setting device for setting a primary water amount and a secondary water amount setting device for setting a secondary water amount. A measuring comparator for comparing the total amount of the primary water amount and the secondary water amount set in the primary water amount setting device and the secondary water amount setting device and the measuring water amount at the time of kneading water measurement, and a measuring comparator A metering controller that opens and closes a water metering valve in response to a signal, a water discharge comparator that compares the amount of water discharged from the water measuring tank with the set amount of the primary water amount setting device at the time of primary water injection, and a signal from the water discharge comparator And a water discharge controller that controls the opening and closing of the water discharge valve so that the residual water remaining in the water measuring tank is discharged as secondary water when the secondary water is charged. Mixing water input device of concrete manufacturing plant.