KR20110089629A - Precision measuring apparatus and method thereof - Google Patents

Abstract

PURPOSE: Precise measuring apparatus and method are provided to improve the work efficiency and the accuracy of a discharging process of a pulverized body. CONSTITUTION: A precise measuring apparatus comprises the following: a storage bin(110) including a hopper on the lower side; a first discharge gate(120) installed on the lower side of the hopper; a second discharge gate(130) installed on one side of the hopper; a first measuring unit(140) discharging the massive amount of pulverized bodies by being installed on the first discharge gate; a second measuring unit(150) discharging the small amount of the pulverized bodies by being installed on the second discharge gate; a measurement bin(160) for storing the pulverized bodies; and a load cell(170) for measuring the discharging mount of the pulverized bodies inside the measurement bin.

Description

Precision Weighing Apparatus and Method {PRECISION MEASURING APPARATUS AND METHOD THEREOF}

The present invention relates to a precision weighing apparatus and method, and more particularly to a precise weighing apparatus and method that can precisely control the discharge of the powder, and can shorten the discharge time to improve the work efficiency.

Remicon (remicon) is an abbreviation of ready-mixed concrete, and refers to concrete mixed with cement, aggregate (gravel, sand, etc.), water, and mixed materials in a constant ratio. The ready-mixed concrete is manufactured in a facility called a batcher plant, and is transported using a truck mixer so that it can be transported to the construction site without being hardened.

Admixtures added during the production of ready-mixed concrete are used to improve the properties of concrete, and are classified into admixtures and admixtures according to the amount of the admixture. Among these, the mixed material is a material mixed for the purpose of improving the workability of concrete, reducing the heat of hydration, reducing shrinkage, reducing alkalinity, and the like, such as fly-ash, blast furnace slag, and silica fume.

Since these admixtures are mixed in a large amount when preparing ready-mixed concrete, their volume should be taken into account in the formulation calculation. In addition, since the admixture changes the properties of the concrete according to the amount added, the cement and the admixture must be accurately weighed and mixed so that the admixture can be added at an appropriate ratio with the cement.

Conventionally, skilled workers took charge of powder weighing operations such as cement and mixed materials when preparing ready-mixed concrete. However, as dust and odors generated during weighing operations cause health problems, and accuracy and efficiency decrease during repetitive work, interest in automatic weighing devices has recently increased.

On the other hand, currently used automatic weighing apparatus includes a storage bin for storing powder, a conveyor for transporting various powders stored in the storage bin, and a weighing bin for weighing various powders transferred by the conveyor.

This conventional automatic metering device controls the amount of powder discharged by adjusting the opening and closing time or the opening and closing amount of the gate valve installed in the storage bin. However, when the opening and closing time of the gate valve is adjusted, the discharge of powder cannot be precisely controlled, and when the opening and closing amount of the gate valve is adjusted, a large amount of time is required to discharge the powder.

The present invention is to solve the problems of the prior art described above is to provide a precise weighing apparatus and method that can precisely control the discharge of the powder, and can improve the work efficiency by reducing the discharge time.

Precision metering apparatus according to the present invention for achieving the above object, the storage bin is provided with a hopper at the bottom, the first discharge gate is installed in the hopper lower portion of the storage bin, the first is installed on one side of the hopper of the storage bin 2 discharge gates, first measuring means installed in the first discharge gate to discharge a large amount of powder, second measuring means installed in the second discharge gate to discharge a small amount of powder, and the first and second And a weighing bin in which the powder discharged from the two measuring means is stored, and a load cell measuring the weight of the powder stored in the weighing bin.

In addition, the precise weighing method according to the present invention, the step of setting the discharge amount and the set value of the powder, the step of discharging the powder in large quantities, and stopping the large amount discharge of the powder when the weight of the discharged powder reaches the set value And precisely controlling the discharge amount by discharging the powder in small amounts, and stopping discharging the small amount of powder when the weight of the discharged powder reaches a set discharge amount.

According to the present invention configured as described above, by discharging a large amount of powder through the first measuring means, it is possible to shorten the discharge time of the powder to improve the work efficiency. In addition, by discharging the powder in small amounts using the second measuring means after the first discharge through the first measuring means, it is possible to precisely control the discharge of the powder.

1 is a view of a precision metering device according to an embodiment of the present invention.
2 is a view of a first measuring means of the precision weighing apparatus according to the present embodiment;
3 and 4 are views of the first measuring means of the precision weighing apparatus according to the present embodiment.
5 is a view of a load cell of the precision metering apparatus according to the present embodiment.
6 is a flow chart of a precision weighing method according to an embodiment of the present invention.

With reference to the accompanying drawings will be described embodiments of the present invention; In the following description of embodiments according to the present invention, and in adding reference numerals to the components of each drawing, the same reference numerals are added to the same components as much as possible even though they are shown in different drawings.

1 is a view of a precision weighing apparatus according to an embodiment of the present invention.

As shown in FIG. 1, the precision metering apparatus 100 according to an embodiment of the present invention includes a storage bin 110 in which powder is stored, and first and first discharged powders stored in the storage bin 110. The first and second measuring means 140 and 150 for measuring the powder discharged through the second discharge gates 120 and 130, the first and second discharge gates 120 and 130, and the first and second measuring means 140 and 150. And a control unit for controlling the operation of the weighing bin 160 in which the discharged powder is stored, the load cell 170 measuring the weight of the powder stored in the weighing bin 160, and the first and second measuring means 140, 150. 180).

Reference numeral 200 denotes a mixing device for mixing the powders weighed by the precision metering device 100 described above.

The storage bin 110 includes a cylindrical body 112 and a hopper 114 formed below the body 112. The storage bin 110 of this shape can store a large amount of powder and at the same time can easily discharge the stored powder, it is very efficient for storing the raw material in powder form.

The first discharge gate 120 is a cylinder extending vertically. The first discharge gate 120 is installed at the lower end of the hopper 114, the first measuring means 140 is installed at the stop portion, and the butterfly valve 122 is installed at the lower end.

The second discharge gate 130 has a T shape consisting of a horizontal tube 132 and a vertical tube 134. The horizontal tube 132 extends horizontally at one side of the hopper 114, and the vertical tube 134 extends vertically at one end of the horizontal tube 132. The second measuring means 150 is installed in the horizontal pipe 132 of the second discharge gate 130, and the butterfly valve 136 is installed at the stop of the vertical pipe 134.

The metering bin 160 is installed under the storage bin 110 and stores the powder discharged through the first discharge gate 120 and the second discharge gates 120 and 130, respectively. The metering bin 160 is formed in the same shape as the storage bin 110, and can store a large amount of powder and easily discharge the stored powder. A cylindrical third discharge gate 164 is vertically installed at the lower portion of the hopper 162 of the metering bin 160, and a butterfly valve 166 is installed at the distal end of the third discharge gate 164.

The controller 180 may include an input unit 182 for inputting powder discharge amount and a set value, a detector 184 for inputting a powder storage amount of the weighing bin 160 measured through the load cell 170, and an input unit 182. And a controller 186 for controlling the operation of the first and second measuring means 140, 150 according to the powder discharge amount and the powder storage amount through the detection unit 184.

The amount of powder discharged through the input unit 182 of the controller 180 is the total amount of powder to be discharged from the storage bin 110 to the weighing bin 160, and the set value is the first and second measuring means 140 and 150. Is a random value entered by the operator to switch its operation. In addition, the powder storage amount is the weight of the powder discharged to the weighing bin 160 during the first weighing by the first measuring means 140.

At this time, the set value is preferably 70 ~ 90% of the discharge of the powder, which is the optimal value that can control the discharge of the powder precisely while improving the work efficiency by reducing the discharge time of the powder. In addition, when the amount of powder storage by the first weighing reaches the set value, the controller 180 stops the operation of the first weighing means 140 and operates the second weighing means 150 to perform the second precision weighing. Conduct.

On the other hand, the controller 186 of the control unit 180 for controlling the operation of the first and second measuring means (140, 150), the rotation speed of the motor (154 of FIG. 3) of the second measuring means 150 to be described later It is desirable to include a variable voltage, variable frequency (VVVF) inverter controller to enable.

2 is a view of a first measuring means of the precision weighing apparatus according to the present embodiment.

The first measuring means 140 is a primary measuring means for discharging a large amount of powder stored in the storage bin 110. As shown in FIG. 2, the first measuring means 140 includes an opening and closing plate 142 that is installed at the first discharge gate 120 and movable horizontally, and an actuator that moves the opening and closing plate 142 horizontally. 144).

The first measuring means 140 of this configuration opens or closes the first discharge gate 120 according to the signal applied from the controller (180 of FIG. 1). That is, when the open signal is applied from the controller 180, the actuator 144 is operated to move the opening and closing plate 142, the first discharge gate 120 is opened by the movement of the opening and closing plate 142, a large amount of powder Is discharged. This is called primary weighing, and the powder storage amount stored in the weighing bin (160 in FIG. 1) by the first weighing is preferably 70 to 90% of the discharge of the powder.

On the other hand, when the amount of powder stored in the weighing bin 160 reaches a set value, a closing signal is applied from the controller 180, and the actuator 144 receiving the closing signal moves the opening / closing plate 142 to an initial position (first discharge gate). (120) to the closed position to block the discharge of the powder. At the same time, the second measuring means (150 in FIG. 1) is operated to perform the second precise weighing.

3 and 4 are views of the second measuring means of the precision weighing apparatus according to the present embodiment.

The second measuring means 150 is a second measuring means for precisely measuring the discharge of the powder by operating after the first weighing by the first measuring means 140. As shown in FIGS. 3 and 4, the second measuring means 150 includes a screw feeder 152 installed inside the horizontal pipe 132 of the second discharge gate 130, and a horizontal pipe ( An electric motor 154 provided at one end of the rotary shaft 152a of the screw feeder 152 protruding to the outside of the 132 and a reducer 156 provided between the rotary shaft 152a of the screw feeder 152 and the motor 154. ).

The screw feeder 152 consists of the rotating shaft 152a mentioned above and the feed blade 152b wound spirally on the outer peripheral surface of the rotating shaft 152a. One end of the rotating shaft 152a protrudes out of the horizontal pipe 132 to be connected to the reducer 156, and the other end thereof is located inside the storage bin 110. In addition, the transfer blade 152b wound around the rotation shaft 152a extends from one end to the other end of the rotation shaft 152a, and one end thereof extends only to the upper portion of the vertical pipe 134. Therefore, when the screw feeder 152 operates, the powder stored in the storage bin 110 is transferred through the horizontal pipe 132, and discharged to the weighing bin (160 in FIG. 1) through the vertical pipe 134.

Since the second measuring means 150 having the above-described structure can adjust the discharge amount of the powder according to the rotation speed of the screw feeder 152, it is possible to control the rotation speed of the electric motor 154 by using a variable voltage, variable frequency inverter controller. In this case, precise weighing is possible.

On the other hand, the upper end of the vertical pipe 134 of the second discharge gate 130, that is, the upper end connected to the horizontal pipe 132 is formed in a tapered shape with a larger diameter toward the top. As such, when the upper end of the vertical pipe 134 is manufactured in the form of a hopper, it is easy to discharge the powder conveyed by the screw feeder 152, and thus the amount of powder discharged can be more precisely measured.

5 is a view of a load cell of the precision metering apparatus according to the present embodiment.

As shown in FIG. 5, the load cell 170 is installed at one side of the weighing bin 160 to measure the amount of powder storage stored in the weighing bin 160. Looking at the process of measuring the powder storage amount using the load cell 170, first of all the weight of the weighing bin 160 and the storage amount of the powder discharged from the storage bin 110 is measured, the value of the first of the weighing bin 160 The weight of the powder is measured by subtracting the weight (weight without powder being stored).

The powder storage amount measured in this way is input through the sensing unit 184 of FIG. 1, and the controller 180 compares this value with a set value, and when the set value is reached, the controller 180 applies a closing signal and first The second precision means is performed by stopping the operation of the measuring means 140 and operating the second measuring means 150 at the same time.

6 is a flowchart of a precision weighing method according to an embodiment of the present invention.

With reference to Figures 1 to 6, it will be described with respect to a precise weighing method using a precision weighing apparatus according to an embodiment of the present invention.

First, the operator inputs the discharge amount and the set value of the powder through the input unit 182 of the controller 180 (S10). At this time, the discharge amount of the powder is the total amount of powder to be discharged from the storage bin 110 to the weighing bin 160, the set value is any input by the operator to switch the operation of the first and second measuring means (140,150) Is the value of.

When the discharge amount and the set value of the powder is set, the controller 180 operates the first measuring means 140 to first weigh (S20). That is, by operating the actuator 144 of the first measuring means 140 to move the opening and closing plate 142 to open the first discharge gate 120 to discharge a large amount of powder. This is called primary weighing, and the powder storage amount stored in the weighing bin (160 in FIG. 1) by the first weighing is preferably 70 to 90% of the discharge of the powder.

When the weight of the powder discharged by the first weighing, that is, the amount of powder storage reaches the set value, the large amount of powder is stopped (S30). At the same time, by discharging a small amount of powder to precisely regulate the discharge (S40).

At this time, the powder storage amount is the weight of the powder discharged to the weighing bin 160 during the first weighing by the first measuring means 140. When the powder storage amount reaches the set value, the load cell 170 detects it and transmits it to the detection unit 184, and the controller 180 applies a closing signal and stops the operation of the first measuring means 140. At the same time, the controller 180 operates the second measuring means 150 to perform the second precision weighing.

In the second precision weighing, as described above, when the variable voltage and the variable frequency inverter controller are used, precise metering of the powder emission is possible. That is, by controlling the rotation speed of the electric motor 154 and the rotation speed of the screw feeder 152 by using an inverter controller, it is possible to adjust the amount of powder conveyed and discharged by the screw feeder 152, through which the fine powder discharge is precisely controlled. I can measure it easily.

When the metering of the powder discharge is completed through the above process, the small amount of powder is stopped (S50). At this time, the powder discharge is measured by the load cell 170, the measured powder discharge is transmitted to the control unit 180 through the sensing unit 184 to stop the operation of the second measuring means (150).

While the present invention has been described through the preferred embodiments, the above-described embodiments are merely illustrative of the technical idea of the present invention, and various changes may be made without departing from the technical idea of the present invention. Those of ordinary skill will understand. Therefore, the protection scope of the present invention should be interpreted not by the specific embodiments, but by the matters described in the claims, and all technical ideas within the equivalent scope should be interpreted as being included in the scope of the present invention.

100: precision weighing device 110: storage bin
120: first discharge gate 130: second discharge gate
140: first measuring means 142: opening and closing plaque
144: actuator 150: second measuring means
152: screw feeder 152a: rotation axis
152b: feed wing 154: electric motor
156: reducer 160: weighing bin
170: load cell 180: control unit

Claims (9)

A storage bin on which a hopper is provided;
A first discharge gate installed under the hopper of the storage bin;
A second discharge gate installed at one side of the hopper of the storage bin;
First measuring means installed in the first discharge gate to discharge a large amount of powder;
A second measuring means installed at the second discharge gate to discharge the powder in a small amount;
A weighing bin in which powder discharged from the first and second measuring means is stored; And
A load cell for measuring the discharge amount of the powder stored in the weighing bin, and after the first weighing of the powder by the first measuring means, characterized in that the second precision measuring by the second measuring means continuously proceeds Metering device. The method according to claim 1,
The second discharge gate includes a horizontal tube installed horizontally on one side of the hopper of the storage bin, and a vertical tube formed perpendicularly to one end of the horizontal tube.
The second measuring means includes a screw feeder (screw feeder) is provided in the interior of the horizontal tube, and the electric motor is installed on one end of the rotating shaft of the screw feeder protruding out of the horizontal tube Metering device. The method according to claim 2,
Precision measuring device further comprises a reducer provided between the rotating shaft of the screw feeder and the electric motor. The method according to claim 3,
The upper end of the vertical pipe connected to the horizontal pipe of the second discharge gate is a precision metering device, characterized in that the diameter of the tapered toward the upper. The method according to claim 4,
The first measuring means, the precision metering device, characterized in that it comprises an opening and closing plate which is installed to be movable horizontally to the first discharge gate, and an actuator for horizontally moving the opening and closing plate. The method according to any one of claims 1 to 5,
Precision measuring device further comprises a control unit for controlling the operation of the first and second measuring means. The method of claim 6,
The control unit includes an input unit for inputting the discharge amount and the set value of the powder, a controller for controlling the operation of the first and second measuring means according to the discharge amount of the powder and the powder storage amount of the weighing bin input through the input unit; It includes a detector for inputting the powder storage amount measured through the load cell,
When the amount of powder stored in the sensing unit reaches the set value input, the second precision means is operated by stopping the operation of the first measuring means by using the controller and simultaneously operating the second measuring means. Precision weighing device, characterized in that. The method according to claim 7,
The controller is a precision metering device, characterized in that it comprises a variable voltage, variable frequency inverter controller. Setting powder discharge amount and a set value;
Discharging a large amount of powder;
Stopping mass discharge of the powder when the amount of discharged powder reaches a set value;
Discharging the powder in small amounts to precisely control the discharge amount; And
When the weight of the discharged powder reaches a set discharge amount, the step of discharging a small amount of powder, comprising the step of discharging the powder through a large amount and a small amount discharged of the powder, characterized in that the precise weighing method.

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