JPH03211423A - Method and device for weighing powder segmented from storage tank - Google Patents

Abstract

PURPOSE:To enable weighing with extremely high accuracy by placing the majority of the weight of the powder storage tank on a counter type suspension device and using a small-capacity scale whose measurement range is narrow. CONSTITUTION:A supporting table 16 on the side of the powder storage tank 1 is provided with a slanting table 7 which can slant through a pin 18 and a counter balance weight 6 which is movable by a tilt angle adjusting cylinder 9 and wheels 13 is arranged on the slanting table 7 to form the counter type suspension device. Then a wire rope 5 which connects the powder storage tank 1 and weight 6 is supported through supporting rollers 20. Consequently, the majority of the powder storage tank 1, a powder segmenting device 2, etc., is charged by the counter balance weight 6, so a load cell as a scale only has a range for weighing the segmented powder and the weighing with high accuracy, therefore, is available.

Description

[Detailed Description of the Invention] <Industrial Application Field> The present invention relates to a method for measuring powdery material (hereinafter referred to as powder) cut out from a storage tank.6 <Prior Art> Powder of pharmaceuticals, etc. When mixing powder, it is necessary to accurately cut out a certain amount of raw material powder from a storage tank, and conventionally the method shown in Fig.
71540, Utility Model Application Publication No. 61-44523).

That is, raw material powder is stored in a storage tank 1, and is cut into a weighing hopper U by a cutting device 2 attached to the lower part of the storage tank 1. The weighing hopper 11 is equipped with an opening/closing gate 2 and a load cell 4 as a weighing device, and the weight of the powder is accurately measured here, and when a certain amount is reached, the cutting device 2 is stopped and the opening/closing gate 12 is closed. Open the powder and put it into the mixing tank lO.

In this case, if the adhesion of the powder is strong, the powder will adhere to the inside of the weighing hopper 11 and the opening/closing gate 12, causing sagging.
The amount of powder measured in the weighing hopper 11 cannot be input, making it difficult to mix to a positive value. Furthermore, since the weighing hopper 11 is provided below the powder storage tank 1, there is a problem in that the overall height of the equipment increases.

<Problems to be Solved by the Invention> As a means to solve such problems, as shown in FIG. It has been proposed that the amount of powder cut out from the powder storage tank 1 by the powder cutting device 2 is calculated based on the weight detected by the load cell 4 based on the amount of decrease (Japanese Patent Application Laid-Open No. 1983-1999).
(See Publication No. 129551).

This means has the advantage that not only can drafts related to the weighing hopper 11 be prevented, but also that the amount of powder remaining in the powder storage tank 1 can be constantly measured. However, with this method, the weight of the powder storage hopper 1 and the cutting device 2 as well as the total weight of the remaining powder are added to the load cell 4, so a large-capacity load cell 4 must be selected, so that the amount of powder to be cut out is small. In this case, there was a problem in that the measurement error of the load cell 4 with respect to the amount of powder to be cut out became large, and the necessary cutting precision could not be obtained.

The present invention has been made in view of the above-mentioned circumstances, and it improves the means for installing a load cell in the lower part of a powder storage hopper having a powder cutting device, so that even if the amount of cut powder is small, it can be measured. The object of the present invention is to provide a method and apparatus for measuring powder cut out from a storage tank, which can measure the amount of cut powder with little error (high accuracy).

<Means for Solving the Problems> The method of the present invention for achieving the above object includes attaching a weighing device to a powder storage tank having a powder cutting device, and removing powder from the powder storage tank by the powder cutting device. A method for measuring powder cut out from a storage tank in which the amount of powder dispensed is measured based on the amount of weight loss detected by the weighing device, wherein most of the weight including the powder storage tank is measured by a counter type. From a storage tank, characterized in that the suspension device has a handle, and the weighing device is a small-capacity scale with a narrow measurement weight range sufficient to measure the amount of cut-out powder. This is a method of measuring the amount of powder to be cut out.

Note that it is preferable that the weight supported by the counter suspension system be adjustable.

Further, the apparatus of the present invention for achieving the above object includes a weighing device provided at the lower part of the powder storage tank in which the powder cutting device is located, and a support pedestal disposed near the powder storage tank; A tilting table whose one end is tiltably supported by a support frame via a pin and is equipped with a tilting angle measuring device; a tilting angle adjustment cylinder connected to the tilting table; A counter-type suspension device comprising a counterbalance weight is installed, and a wire rope connecting the powder storage tank and the counterbalance weight is supported via a plurality of support rollers to encompass the powder storage tank. Most of the weight is carried by a counterbalance weight, and the scale has a small capacity with a narrow measurement weight range sufficient to measure the amount of powder cut out from the storage tank. It is a measuring device.

In place of the counter type suspension device, a balance arm whose central portion is tiltably supported by a support frame via a pin;
A counter balance weight that supports a body storage tank at one end of the balance arm and is mounted on the other end of the balance arm so as to be self-propelled and is equipped with a position detector. It is also possible to install equipment.

<Example> Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 shows an embodiment of the present invention. In FIG. 1, a powder storage tank 1 having a powder cutting device 2 is provided with a load cell 4 as a weighing device, and the powder placed on the load cell 4 is The amount of powder cut out by the powder cutting device 2 from the storage tank 1 is measured based on the small amount of weight 1fJIi detected by the load cell 4, as in the conventional example shown in Fig. 4, but the load cell is a weighing device. For No. 4, a small-capacity one with a narrow measuring weight range sufficient to measure the amount of cut powder is used.

Further, in the present invention, there is provided a support pedestal 16 disposed near the powder storage tank 1, one end of which is tiltably supported by the support pedestal 16 via a pin 18, and an inclination angle measuring device (Selsin) 8. , a tilt angle adjustment cylinder 9 connected to the tilt base 7, and a counterbalance weight 6 movably mounted on the tilt base 7 by wheels 13 using linear hair rings or the like. A counter-type suspension device is installed to support the wire row 15 connecting the powder storage tank 1 and the counterbalance weight 6 via a plurality of support rollers 20 arranged on its path.

Next, to explain the present invention in detail, first, when the horizontal tilt table 7 is tilted downward using the pin 18 as a fulcrum by actuating the cylinder 9, the counter balance weight 6 is moved through the wheels 13 using linear bearings. and move it slightly downward,
The gravity of the counterbalance weight 6 is transmitted to the wire rope 5, and an upward force is applied to the powder storage tank 1 via the support roller 20.

The tilting table 7 has an ItJt tilt angle θ of /!
111 is tilted 9, ↓ by the cylinder 9 while keeping the load cell 4 constant.If the body 75) to be cut out from the body storage tank weighs 3 kg, adjust the tilt angle θ of the tilt table 7,
The weight of the powder storage tank 1 containing the powder and the powder cutting device 2, etc. until the output becomes a value slightly larger than 3 kg, for example 5 kg (adjust the bevel angle. By doing this, 1 yen) The counterbalance weight 6 is responsible for most of this.

Next, the drive motor 3 of the powder cutting device 2 is operated, and the powder cutting device 2 is stopped when the difference between the output of the load cell 4 and the output before cutting is 3 kg, that is, the output of the load cell 4 shows 2 kg.

When checking the amount of powder remaining in the powder storage tank l, calculate the counter-harance force from the inclination angle θ value of the tilt table 7 indicated by the cellnon 8, and add the output of the load cell 4 to this to calculate the total weight. After performing the calculation, the amount of powder remaining can be determined by subtracting the air volume lit of the powder storage tank 1 and the like.

FIG. 2 shows another embodiment of the present invention. In FIG. A balance arm 14 whose central part is supported by the balance arm 14, and a counter having the powder storage tank 1 supported at one end of the balance arm 14 and mounted so as to be self-propelled at the other end and equipped with a position detector 17. A counter suspension system consisting of a balance weight 6 is installed.

The counter balance weight 6 can be freely moved on the balance arm 14 by a self-propelled motor 15, and a position detector 17 is connected to the self-propelled motor 15 so that the position of the counter balance weight 6 can be detected. It has become.

Powder amount i! When cutting out powder from 1, first, the counterbalance weight 6 placed on the balance arm I4 is moved by operating the self-propelled motor 15 while the position is detected by the position detector 17. Most of the weight of the powder storage tank 1 containing the powder, the powder cutting device 2, etc. is supported by the counterbalance weight 6, and the load cell 4 has an output sufficient to gtit the amount of powder to be cut out. Adjust the position of the counterbalance weight 6 as follows.

The harrance force of the counterbalance weight 6 can be calculated from the output of the position detector 17, and the other operations are the same as in the previous embodiment, so the explanation will be omitted.

<Effects of the invention> Table 1 shows a comparison of the capacity, accuracy, etc. of the load cell between the conventional method using the device shown in FIG. 4 and the method of the present invention using the device shown in FIG. . [Measurement accuracy of cell -1
/10,000, and the weight of the powder storage is 8,000 kg when fully loaded with powder, including the powder cutting device.

As shown in Table 1, it can be seen that the method of the present invention allows for more accurate measurements compared to the conventional method.6

[Brief explanation of drawings]

Fig. 1 is a side view showing an embodiment of the present invention, Fig. 2 is a side view showing another embodiment of the invention, Fig. 3 is a side view showing a conventional example, and Fig. 4 is a side view showing another conventional example. FIG. ■...Powder storage hopper, 2...Powder cutting device, 3
... Drive motor, 4... Load cell, 5...
・Wire rope, 6... Counter balance weight, 7... Incline table, 8... Inclination angle measuring device,
9... 8-round tilt angle adjusting cylinder, 10... Preparation tank, 11... Measuring pump, 12... Opening/closing gate,
13...Wheel, 14...Balance arm, 15...Self-propelled motor, 16...Support frame,
17...Position detection 2;, I8.19...Pin,
20...Support roller

Claims (1)

[Claims] 1. A weighing device is attached to a powder storage tank having a powder cutting device, and the amount of powder cut out from the powder storage tank by the powder cutting device is detected by the weighing device. In a method for measuring powder cut out from a storage tank in which the weight is measured based on the amount of weight loss, most of the weight including the powder storage tank is carried by a counter-type hanging device, and the cut-out powder is used as the weighing device. A method for measuring the amount of powder cut out from a storage tank, characterized in that the amount of cut powder is measured using a small-capacity scale with a narrow measurement weight range sufficient to measure the weight. 2. The method according to claim 1, wherein the weight carried by the counter type hoisting device is adjustable. 3. A weighing device is provided at the bottom of a powder storage tank having a powder cutting device, and a support pedestal is provided near the powder storage tank, and one end portion of the support pedestal is tiltably attached to the support pedestal via a pin. a counter balance weight that is movably placed on the tilt table; a tilt angle adjustment cylinder connected to the tilt table; A rack device is installed, a wire rope connecting the powder storage tank and the counterbalance weight is supported via a plurality of support rollers, and most of the weight including the powder storage tank is borne by the counterbalance weight. 2. A device for measuring the amount of powder cut out from a storage tank, characterized in that the scale has a small capacity with a narrow measurement weight range sufficient to measure the amount of powder cut out. 4. A balance arm whose central part is tiltably supported by a support frame via a pin, and a powder storage tank is supported at one end of the balance arm, and the balance arm is capable of self-propelled toward the other end. 4. The apparatus according to claim 3, further comprising a counter-type hanging device comprising a counterbalance weight placed thereon and equipped with a position detector.