JPH0692902B2 - Powder weighing device - Google Patents

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a powder weighing device capable of quantitatively and accurately measuring chemicals, explosives and other powders (hereinafter simply referred to as powders).

2. Description of the Related Art One of the methods for measuring powder and the like is to use a balance. This method is relatively accurate and easy to measure powders, etc., but on the other hand, in many cases it is necessary to adjust it with a scoop so that it balances the weight placed on the other plate. It is not suitable for performing a large number of measurements.

A device for automatically measuring powder and the like is also known. This device, as shown in FIG. 3, has upper and lower upper plates a,
Of the middle plate b and the lower plate c, the upper plate a and the lower plate c are fixed, the middle plate b is slidable in one direction, and each plate a, b, and c has a through hole d of the same cross section. The plate is formed in the sliding direction of the plate, and the intermediate plate b is reciprocated between the solid line position and the imaginary line position in the figure to measure the powder and the like. That is, at the solid line position where the through hole d of the middle plate b coincides with the through hole d of the upper plate a, the powder or the like in the hopper e is filled into the through hole d of the middle plate b through the through hole d of the upper plate a, Then, at a virtual line position where the through hole of the middle plate coincides with the through hole of the lower plate, a certain amount of powder or the like filled in the through hole of the middle plate is discharged from the through hole of the lower plate. . According to this device, each time the intermediate plate reciprocates, the powder or the like corresponding to the volume of the through hole of the intermediate plate is measured, and a fixed amount of the powder or the like can be measured every fixed time. The bulk density of the powder or the like filled in the through holes of the plate changes depending on the amount of the powder or the like stored in the hopper. The larger the storage amount in the hopper, the more powder or the like in the through holes of the middle plate. Is packed and becomes heavy. Therefore, there is a dislike that the measured powder, etc. changes depending on the amount of powder, etc. filled in the hopper.Because the middle plate reciprocates, it vibrates when the direction of movement of the middle plate changes at the left and right dead points. This has an unfavorable influence on the measurement, and further has a drawback that powder or the like is slid out from between the plates and spills from the end faces.

DISCLOSURE OF THE INVENTION Problems to be Solved by the Invention An object of the present invention is to solve the above problems and to provide a powder weighing device capable of accurately weighing a fixed amount of powder or the like.

Problem Solving Means An example of the solving means will be described with reference to FIG.

A first rotating body 2 and a second rotating body 3 are axially supported on the main body 1 at appropriate intervals in the vertical direction, and both rotating bodies are rotated in opposite directions or the same rotation by a driving device provided in common or separately. The rotary bodies 2 and 3 are formed with a plurality of recesses 4 having the same volume on the same circumference. Reference numeral 5 denotes a supply hole 6, which is a through hole for communicating the horizontal holes 7 and 8 into which the respective rotating bodies are inserted, 9 is a discharge hole, and each of the holes 5, 6 and 9 has an opening to the horizontal holes 7 and 8 at the circumference. It is provided above. Reference numeral 11 is a hopper connected to the supply hole 5.

The supply hole 5 is always filled with powder or the like stored in the hopper, and when the recess 4 is communicated with the supply hole 5 by the rotation of the first rotating body 2, the powder or the like is stored in the recess. To fill the recesses 4 (the bulk density at this time varies depending on the amount of powder and the like stored in the hopper, and the larger the volume, the larger the pressure applied to the recesses and the more likely they are to be clogged. Will be). The powder or the like filled in the recess is cut at the opening edge of the supply hole 5 as the rotating body 2 rotates, and when the recess 4 is disengaged from the opening, the volume of the recess 4, that is, the horizontal hole. Powder or the like corresponding to the volume of the void formed on the inner circumference and the recess is separated. First rotating body 2
When the concave portion 4 passes through the through hole 6 while rotating, the powder and the like in the void is discharged into the through hole 6, and the concave portion 4 of the second rotating body 3 communicates with the through hole 6. When it hits, it falls into the recess 4. Then, it is filled, but since the pressing force from above does not act on the powder or the like discharged into the through hole, it is lightly clogged in the recess of the second rotating body 3 (powder or the like which does not fit in the recess). Are somewhat left in the through holes), so that the bulk density in the recess is relatively small and the variation in bulk density is relatively small. In the same manner as described above, the powder or the like filled in the recess 4 of the second rotating body 3 separates the volume of the recess as the rotating body rotates, and is half rotated and discharged from the discharge hole 9. . The remaining separated powder and the like are in a small amount, but are left in the through hole. The powder etc. left behind in the through hole is filled in the next recess of the second rotating body together with the powder etc. newly discharged in the through hole.

As described above, the rough measurement is performed by the first rotating body and the precise measurement is performed by the second rotating body, and this is intermittently repeated by the rotation of the rotating body, that is, intermittently performed.

In the above example, the weighing is performed by two rotating bodies, but the weighing can be performed by three or more rotating bodies.
As a result, more accurate weighing can be performed.

The first and second rotating bodies may have different shaft diameters,
Preferably, they are formed to have the same diameter, and the axes of both rotating bodies are preferably provided in the same vertical plane. It is desired that the through hole has at least a space larger than the above-mentioned void, but if the space is small, the first rotating body 2
When the recess of the second rotating body communicates with the through hole 5, the recess of the second rotating body 3 also communicates with the through hole 5, and the powder discharged into the through hole is immediately filled in the recess of the second rotating body. You just have to do it.

The recesses may be formed in only one place on the same circumference, but when forming a plurality of recesses, they are preferably formed at regular intervals in the circumferential direction. The measurement is performed at regular intervals, and if the receiving part is intermittently fed below the discharge hole, it becomes possible to quantitatively supply powder or the like to the receiving part. The recess does not necessarily have to have a shape that matches the opening of the supply hole, the through hole, or the discharge hole.
Further, the recesses do not have to have the same shape as long as the volume is constant.

The supply holes, the through holes and the discharge holes are preferably formed on the same vertical line, but the openings of the respective holes are aligned, or the openings of the supply holes and one end of the through hole and the other end of the through hole and the discharge port are formed. If the openings are located on the same circumference, the holes do not have to be on the same vertical line.

The above-mentioned weighing can be performed in one row or in a plurality of rows in the axial direction of the rotating body.

Example The main body 1 is attached to a support base 13 together with a hopper 11, and the first and second rotating bodies 2 and 3 having the same diameter can be rotated in the lateral holes 7 and 8 having the same hole diameter formed in the upper and lower sides, respectively. The rotary bodies 2 and 3 are fitted and inserted, and the movement of the rotary bodies 2 and 3 in the axial direction is regulated by the presser 15 from both sides. Then, the pinions 16 fixed to one side are engaged with the pinions 18 of the motor 17 from above and below, and the motors 17 are rotationally driven in the sending directions to each other. The first and second rotating bodies 2 and 3 are also formed with recesses 4 of the same shape at symmetrical positions on the circumference, and both recesses 4 are feed holes communicating with the lateral holes 7 and 8 when they are positioned vertically. 5, the through hole 6 and the discharge hole 9 are aligned on the same vertical line, and the recess, the supply hole, the through hole and the discharge hole have the same sectional shape. The two rotating bodies are positioned so that when the recess of one rotating body coincides with the through hole, the recess of the other rotating body also coincides with the through hole.

As described above, in the powder weighing device of the present invention, a plurality of rotating bodies are axially supported by the main body at appropriate intervals in the vertical direction, and each of them is rotated by the drive device, and inside the recess as the rotating body rotates. After filling powder etc. through the supply hole, separate the amount corresponding to the volume of the recess, move it in the circumferential direction, discharge it into the through hole, and fill the recess of the lower rotating body. By doing so, the bulk density of the powder etc. filled in the recess of the uppermost rotating body changes depending on the amount of the powder etc. stored in the hopper. The difference in volume is relatively small even if the value changes, so that the variation in bulk density is small in the second stage (even less in the third and subsequent stages), and there is less vibration due to the unidirectional rotary motion. Improves weighing accuracy and automatically determines the amount of powder etc. by rotating the rotating body. That can be measured quantitatively, and the powder or the like may be slid out in the circumferential direction along the circumferential surface with the rotation of the rotating body, but is not slid out in the axial direction.
It has an effect that there is little or no spillage from the end face.

[Brief description of drawings]

FIG. 1 is a sectional view of a main part of a powder weighing device according to an embodiment of the present invention, FIG. 2 is a sectional view taken along the line AA of FIG. 1, and FIG. 3 is a sectional view of a conventional example. 1 ... Main body, 2,3 ... Rotating body, 4 ... Concave 5 ... Supply hole, 6 ... Through hole, 7,8 ... Horizontal hole 9 ... Discharge hole

Claims (1)

[Claims] 1. A main body 1 having a plurality of horizontal holes 7 and 8 having a circular cross section formed in parallel in the vertical direction at appropriate intervals and a rotary body 2 having a circular cross section which is rotatably fitted in each horizontal hole. Three
Drive devices 16, 17 and 18 for rotating the rotating bodies, recesses 4 of the same volume formed at one or more appropriate intervals on the circumference of each rotating body, and the lower end of the uppermost horizontal row. It is composed of a supply hole 5 which is opened to the hole 7 and whose upper end is connected to the hopper 11, a through hole 6 which is formed between the horizontal holes, and a discharge hole 9 which is opened at the upper end to the horizontal hole 8 in the lowermost stage. The plurality of openings formed in the holes 7 and 8 are located on the circumference of the circle through which the recess passes.