JPH06288815A - Apparatus for weighing powdery specimen for analysis - Google Patents

Abstract

PURPOSE:To provide a small-sized apparatus for weighing a powdery specimen for analysis capable of supplying specimens to various kinds of specimen vessels and of weighing those quickly. CONSTITUTION:A holder sections 4 each having a different shape, in which a plurality of kinds of specimen vessels 5 each having a different shape in accordance with the objects of analysis are installed respectively, are provided on the same circumference of a circle of a turntable 1. In a place surrounding the turntable, a powdery specimen supplier 6 and a weighing device 14 are disposed. The powdery specimen is supplied and is weighed in a condition in which the specimen vessel is lifted 5 from the turntable 1.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is for analytical use for automatically carrying out various kinds of analysis such as calorific value, moisture, volatile matter, sulfur content, elemental analysis, etc., on powder samples such as coal. The present invention relates to a powder sample weighing device.

[0002]

2. Description of the Related Art While various types of analysis as described above use analyzers according to their respective purposes, in order to carry out automatic analysis, powders can be placed in a plurality of types of sample containers having different shapes depending on the purpose of analysis. A device is required to supply each sample, weigh it, and send it to these analyzers. For this reason, a horizontally long container base on which various sample containers are placed is linearly moved by a uniaxial robot so that the sample can be supplied and weighed for each sample container. A body sample weighing device has already been developed.

However, this conventional apparatus has a drawback that it takes a lot of time to move the sample container because each sample container is supplied and weighed while moving various sample containers by a uniaxial robot. . In addition, this device has a drawback that the uniaxial robot requires a large space and, when combined with an analyzer, the entire system becomes large.

[0004]

DISCLOSURE OF THE INVENTION The present invention solves the above-mentioned problems of the prior art, and can supply a sample to various sample containers and measure them quickly without requiring a large space. The present invention has been made to provide a weighing device for powder samples for analysis capable of performing the above.

[0005]

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and a plurality of types of samples having different shapes depending on the purpose of analysis are provided on the same circumference of a turntable that can be moved up and down and intermittently rotated. While forming a holding part with a different shape for housing the container, weigh the turntable around the turntable and the powder sample feeder for the sample container lifted from the holding part, and the sample container lifted from the holding part. It is characterized in that a weighing machine for arranging is arranged.

[0006]

The weighing device for powder samples for analysis of the present invention accommodates a plurality of types of sample containers having different shapes depending on the purpose of analysis, with respect to holding portions having different shapes formed on the same circumference of the turntable. In addition, the sample is supplied from the powder sample feeder to each sample container by utilizing the intermittent rotation of the turntable, and the sample is weighed by the weigher. Further, when supplying and weighing these samples, each sample container is lifted from the holding portion of the turntable to prevent the samples from spilling out and to enable accurate weighing.

As described above, the weighing device for the powder sample for analysis of the present invention uses the turntable, and the time required for moving the sample container is longer than that of the conventional device using the uniaxial robot. Can be significantly shortened. Further, the apparatus can be downsized as compared with the conventional one using the one-axis robot.

[0008]

The present invention will be described below in more detail with reference to the illustrated embodiments. 1 is a front view of the entire apparatus of the embodiment, FIG.
Is a plan view thereof. In these figures, 1 is a turntable that rotates intermittently in the clockwise direction, 2 is its drive device,
Reference numeral 3 denotes four lifting cylinders for lifting the turntable 1 together with the drive device 2.

As shown in FIG. 2, sample container holders 4 are provided at equal intervals on the same circumference of the turntable 1. As shown in FIG. 6, the sample containers 5 have different shapes and sizes depending on the purpose of analysis. For this reason, in addition to the cross-shaped hole 4a as shown in the drawing, the holding portion 4 of the sample container 5 is formed with a concave portion having a different shape that matches the different bottom shape of each sample container 5, which is determined respectively. Only the sample container 5 is held. Further, the holding portion 4 of the sample container 5 is replaceable, and is formed so as to be able to cope with the case where the shape is changed due to another purpose of analysis. The supply and removal of the sample container 5 from the turntable 1 are performed at the 4 o'clock position. In addition,
In this embodiment, the number of holding parts 4 of the turntable 1 is six and the number of the sample containers 5 is four. Therefore, the two stations of the turntable 1 are operated with blanks.

A powder sample feeder 6 is provided at the 6 o'clock position of the turntable 1. As shown in the enlarged view of FIG. 3, the powder sample feeder 6 is a device for supplying a predetermined amount of powder sample to each sample container 5 by the weighing feeder 7. However, if the distance between the tip of the weighing feeder 7 and the sample container 5 is large, the powder sample may be spilled due to the influence of the convection of the surrounding air, and therefore, in the present invention, as shown in FIG. In addition, the sample container 5 is lifted from the holding portion 4 of the turntable 1 by the elevator 8 provided below the turntable 1 so as not to be affected by convection of ambient air. In this way, the sample container 5 is lifted from the holding part 4 of the turntable 1 and supplied with the powder sample, and then descends to the holding part 4 of the turntable 1 and the turntable 1 is rotated by 60 degrees.

At the 8 o'clock position of the turntable 1, an air nozzle 9 for blowing off the powder sample spilled from the sample container 5 is provided. The air nozzle 9 is directed to the lower portion of the sample container 5, and has a structure that does not blow off the powder sample inside the sample container 5.

At the 10 o'clock position of the turntable 1, FIG.
A sample leveling mechanism 10 as shown in FIG. This is an apparatus for vibrating the sample container 5 by the two vibrators 11 and 12 arranged vertically and horizontally to flatten the powder sample in a heap shape. The sample leveling mechanism 10 is equipped with a vacuum chuck 13 for adsorbing the bottom surface of the sample container 5 so that the sample container 5 is vibrated while being lifted from the turntable 1. This leveling operation is performed on all sample containers 5 other than those for elemental analysis.

At the 12 o'clock position of the turntable 1, a weighing machine 14 for weighing the sample container 5 is provided. Although the weighing is performed by an electronic balance, as shown in FIG. 5, windshields 15 and 16 are provided above and below the turntable 1, respectively, so that precise weighing can be performed without being affected by the convection of the outside air. .

This weighing operation will be described with reference to FIG.
First, the turntable 1 is stopped as in A, and then the turntable 1 is lowered as in B, and the sample container 5 is placed in the weighing machine 14
Place it on the balance table 17 of. At the same time, the lower surface of the turntable 1 contacts the lower windshield 16 and becomes airtight. A packing 18 is provided on the contact surface. Next, the upper windshield 15 provided with the packing 19 descends like C and contacts the upper surface of the turntable 1. As a result, the upper and lower airtightness is maintained, and precise weighing can be performed without being affected by the convection of the outside air.

The turntable 1 of the present embodiment has a structure in which the turntable 1 is rotated clockwise by 60 degrees at a position raised by the lifting cylinder 3, and is lowered after stopping. To briefly explain the overall flow again, first, four types of sample containers 5 are sequentially supplied to each holding unit 4 at the 4 o'clock position.

Next, each sample container 5 is sequentially rotated to the 6 o'clock position to supply the powder sample. The sample container 5 to which the powder sample is supplied is rotated to the 8 o'clock position, where the spilled powder sample is blown off by the air nozzle 9 and the surface is flattened by the sample leveling mechanism 10 at the 10 o'clock position. To be done.
Then, the weighing machine 14 weighs at the 12 o'clock position. After performing the above operations on each sample container 5, each sample container 5 is sequentially taken out at the 4 o'clock position and sent to each analyzer by the robot arm.

[0017]

As described above, the weighing device for powder samples for analysis according to the present invention accommodates a plurality of types of sample containers having different shapes depending on the purpose of analysis in the holding portions having different shapes of the turntable. In addition, supply of powder sample,
It is used for leveling, weighing, etc., and the time required for moving the sample container can be significantly shortened compared to the conventional one that uses a single-axis robot, and the device can be downsized. . Moreover, when supplying and weighing the powder sample,
Since each sample container is lifted from the holding portion of the turntable, it is possible to prevent the sample from spilling and to perform accurate weighing. Therefore, the present invention is extremely excellent as an apparatus for weighing powder samples for analysis for automatic analysis of coal and the like.

[Brief description of drawings]

FIG. 1 is a front view of an apparatus according to an embodiment of the present invention.

FIG. 2 is a plan view of an apparatus according to an embodiment of the present invention.

FIG. 3 is an enlarged side view of an apparatus according to an embodiment of the present invention.

FIG. 4 is a side view showing a sample leveling mechanism.

FIG. 5 is a side view illustrating a weighing operation.

FIG. 6 is a perspective view showing the shapes of various sample containers.

[Explanation of symbols]

 1 turntable 4 holding part 5 sample container 6 powder sample feeder 14 weigher

Front Page Continuation (72) Inventor Seiji Koji 2-167-1, Taishi, Midori-ku, Nagoya-shi, Aichi (72) Inventor Yoshihiko Ishida 2-611-1, Asahide, Midori-ku, Nagoya-shi, Aichi (72) Inventor Toshihiko Nakagawa 2-83 Ishibashi-cho, Hekinan City, Aichi Prefecture

Claims (1)

[Claims] 1. A holding part having different shapes for accommodating a plurality of types of sample containers having different shapes depending on the purpose of analysis is formed on the same circumference of the turntable, and the holding part is provided around the turntable. A powder sample feeder for a sample container lifted from a container, and a scaler for weighing the sample container lifted from a holder are arranged.