WO2020012675A1

WO2020012675A1 - Sample container holder and electronic balance

Info

Publication number: WO2020012675A1
Application number: PCT/JP2018/042459
Authority: WO
Inventors: 正幸河合; 勇輝山下; 弘浜本; 淳史飯塚
Original assignee: 株式会社島津製作所
Priority date: 2018-07-12
Filing date: 2018-11-16
Publication date: 2020-01-16
Also published as: CN112313486A; CN112313486B; JPWO2020012675A1; JP6908194B2

Abstract

A sample container holder 5 is provided with a first vertical plate 51, a second vertical plate 52, a third vertical plate 53, and a fourth vertical plate 54. In a state in which a sample container 10 is held by the sample container holder 5, the neck section 102 of the sample container 10 is supported by the fourth vertical plate 54, and the bottom section 101 of the sample container 10 is supported by each of the first vertical plate 51, the second vertical plate 52, and the third vertical plate 53. Here, the sample container 10 is held by the sample container holder 5 while the axial direction of the sample container 10 is tilted relative to the vertical direction. Consequently, the sample container 10 can be stably held by the sample container holder 5.

Description

Sample container holder and electronic balance

The present invention relates to a sample container holder for holding a sample container used for weighing in an electronic balance, and an electronic balance having a weighing chamber in which the sample container holder is stored.

Conventionally, an electronic balance including a main body having a weighing chamber formed therein and a weighing dish disposed in the weighing chamber has been used. In an electronic balance, a sample is placed on a weighing dish, and the sample is weighed in a state where the weighing chamber is stable (for example, see Patent Document 1 below).

In such an electronic balance, the weighing dish is usually connected to a weighing cell disposed in the main body via a support shaft or the like. Then, when the sample is placed on the weighing dish, a force is applied to the weighing cell. The weighing cell calculates (weighs) the mass of the sample based on the magnitude of the applied force.

JP 2017-58204A

として As a case of using the above-mentioned conventional electronic balance, a powdery or liquid sample may be measured. In this case, the sample is weighed by placing a dedicated container on a weighing dish and placing the sample in the container. In general, users use various types of containers. Therefore, the conventional electronic balance has a problem that it is difficult to place the container on the weighing dish in a stable state depending on the shape of the container. It is also conceivable to prepare a dedicated holder for each container. However, in such a case, it is necessary to change the holder for each container, which complicates the user's work.

Furthermore, the container may be placed on the weighing dish in a state where the container is charged with static electricity, causing a problem that the accuracy of the measurement is reduced. In this case, the container is neutralized by operating the static eliminator provided in the electronic balance. However, depending on the shape of the container, there is a problem that the static elimination of the container cannot be performed smoothly. For example, if the bottom surface of the container is flat, the bottom surface of the container will be in close contact with the weighing dish, so ions generated by the static eliminator will not reach the bottom surface, and the bottom surface of the container will be smoothly discharged. Difficult to do. Specifically, in a state where the container is in contact with the weighing dish, there is a problem that the ions generated in the static eliminator do not reach the static electricity on the bottom surface of the container and thus cannot be neutralized. In addition, the static electricity on the bottom of the container gradually flows to the plate and decreases. In this case, however, the time required for the static electricity to decrease becomes long, and a problem that the measured value is not stable occurs.

The present invention has been made in view of the above circumstances, and has as its object to provide a sample container holder and an electronic balance that can hold various sample containers in a stable state.
Another object of the present invention is to provide a sample container holder and an electronic balance that enable accurate measurement of a sample.

(1) A sample container holder according to the present invention is a sample container holder for holding various sample containers used for measurement in an electronic balance. The sample container holder includes a base member, a first holding member, and a second holding member. The first holding member extends upward from the base member, and holds a first portion of the sample container at a leading edge thereof. The second holding member extends upward from the base member, is arranged at a distance from the first holding member, and holds a second portion of the sample container at a leading edge thereof. In the sample container holder, a vertical dimension of the second holding member is larger than a vertical dimension of the first holding member. In the sample container holder, a direction in which the projected area of the first holding member in the horizontal direction is minimum and a direction in which the projected area of the second holding member in the horizontal direction is minimum substantially coincide with each other.

According to such a configuration, when the sample container is held using the sample container holder, the first portion of the sample container is held by the first holding member, and the second portion of the sample container is held by the second holding member. Will be held. Further, since the vertical dimension of the second holding member is larger than the vertical dimension of the first holding member, the sample container holder holds the sample container in an inclined state.
Therefore, when various sample containers are held by the sample container holder, the sample containers can be held in a stable state, and operability can be improved. That is, the sample container can be stably held in a state where the weighing operation is easy.

The sample container is held by the sample container holder with the bottom part floating.
Therefore, when the sample container holder and the sample container are set in the main body of the electronic balance while the sample container is held by the sample container holder, the gap between the bottom of the sample container and the mounting surface of the main body of the electronic balance is set. A certain space can be formed.
As a result, for example, when ions for static elimination are generated in the main body of the electronic balance, the ions can reach the bottom surface of the sample container, and static elimination can be performed on the entire surface of the sample container.

That is, since a gap can be secured between the installation surface of the main body of the electronic balance and the bottom of the sample container, ions generated by the static eliminator can be delivered to the bottom of the sample container.
Further, in the sample container holder, the direction in which the projected area of the first holding member in the horizontal direction is minimum and the direction in which the projected area of the second holding member in the horizontal direction are substantially the same. If the sample container holder is installed such that the direction of supply of ions from the static eliminator substantially coincides with the direction in which ions are supplied, it is possible to prevent the movement of ions from being hindered by the first and second holding members.
Therefore, it is possible to smoothly remove the charge from the sample container. Then, the electronic balance can accurately measure the sample.

(2) The sample container holder may further include a third holding member. The third holding member extends upward from the base member, and is disposed between the first holding member and the second holding member, and holds a third portion of the sample container at a leading edge thereof. I do. The vertical dimension of the third holding member may be smaller than the vertical dimension of the first holding member.

According to such a configuration, since the third portion of the sample container is held by the third holding member, the sample container can be kept in a more stable state.

(3) The third holding member may support a bottom of the sample container.

According to such a configuration, the sample container can be supported from below by the third holding member.
Therefore, the sample container can be kept in a more stable state.

(4) The width of the third holding member in the horizontal direction may be smaller than the width of the first holding member in the horizontal direction.

According to such a configuration, sample containers of various sizes and shapes can be more stably held by the sample container holder.

(5) Also, at least one of the first holding member, the second holding member, and the third holding member may be formed in a plate shape.

According to such a configuration, in the sample container holder, each of the first holding member, the second holding member, and the third holding member can be simply configured.

(6) Further, among the first holding member, the second holding member, and the third holding member, a concave portion may be formed at a leading edge of a member formed in a plate shape.

According to such a configuration, when the sample container is held by the sample container holder, the sample container is supported at two points by the concave portions formed in the first holding member, the second holding member, and the third holding member. Point support).
Therefore, the sample container can be held in a more stable state by the sample container holder.

(7) Further, the first holding member, the second holding member, the third holding member, and the base member may be formed of a single plate-shaped member.

According to such a configuration, since the sample container holder is formed from a single plate-like member, it can be manufactured at low cost and can be adapted to various types of containers. Further, workability can be improved.

(8) At least one of the first holding member, the second holding member, and the third holding member may be formed in a rod shape.

According to such a configuration, in the sample container holder, the strength of the member holding the sample container can be increased.

(9) An electronic balance according to the present invention includes the sample container holder, a main body, and a static eliminator. The main body has a weighing chamber in which the sample container holder is stored. The static eliminator is provided in the main body, and removes electricity in the weighing chamber by supplying ions into the weighing chamber. When viewed in the supply direction of the ions from the static eliminator, the projected area of the first holding member is minimized, and the projected area of the second holding member is minimized.

According to such a configuration, it is possible to prevent the movement of the ions supplied from the static eliminator from being hindered by the first holding member and the second holding member.
Therefore, ions supplied from the static eliminator can be smoothly moved between the bottom of the sample container and the installation surface in the electronic balance.
As a result, the sample container can be smoothly neutralized by the neutralization device.

According to the present invention, when various sample containers are held by the sample container holder, the sample containers can be held in a stable state, and the operability can be improved. That is, the sample container can be stably held in a state where the weighing operation is easy. The sample container is held by the sample container holder with the bottom part floating. Therefore, when the sample container holder and the sample container are set in the main body of the electronic balance while the sample container is held by the sample container holder, the gap between the bottom of the sample container and the mounting surface of the main body of the electronic balance is set. A certain space can be formed. As a result, for example, when ions for static elimination are generated in the main body of the electronic balance, the ions can reach the bottom surface of the sample container, and static elimination can be performed on the entire surface of the sample container. That is, since a gap can be secured between the installation surface of the main body of the electronic balance and the bottom of the sample container, ions generated by the static eliminator can be delivered to the bottom of the sample container. Also, in the sample container holder, the direction in which the projected area of the first holding member in the horizontal direction is the smallest and the direction in which the projected area of the second holding member in the horizontal direction is the smallest, and these directions are the same. If the sample container holder is installed such that the direction of supply of ions from the static eliminator substantially coincides with the direction in which ions are supplied, it is possible to prevent the movement of ions from being hindered by the first and second holding members. Therefore, it is possible to smoothly remove the charge from the sample container. Then, the electronic balance can accurately measure the sample.

It is a perspective view showing composition of an electronic balance concerning a 1st embodiment of the present invention. FIG. 2 is a perspective view showing a configuration of a sample container holder according to the first embodiment of the present invention. It is a side view of a sample container holder. It is the perspective view which showed the state which mounted the sample container in the sample container holder. It is a side view showing the state where the sample container was mounted on the sample container holder. While the sample container is held by the sample container holder, the charge amount of the sample container when the sample container holder and the sample container are disposed in the main body and static elimination is performed, and only the sample container is disposed in the main body. 5 is a graph showing the amount of charge of a sample container when static elimination is performed by using the method of FIG. It is a perspective view showing the composition of the sample container holder concerning a 2nd embodiment of the present invention.

1. FIG. 1 is a perspective view showing a configuration of an electronic balance 1 according to a first embodiment of the present invention.
The electronic balance 1 is, for example, an electromagnetic balance type, and can perform measurement with high accuracy with a minimum display of 0.1 mg or less. However, the electronic balance 1 is not limited to the electromagnetic balance type, and any other type such as a load cell type can be used.

The electronic balance 1 includes a main body 2, a static eliminator 3, and a weighing dish 4. Although not shown in FIG. 1, the electronic balance 1 includes a sample container holder 5 described later. The sample container holder 5 is placed on the weighing dish 4 at the time of measurement. Details of the configuration of the sample container holder 5 will be described later.

The main body 2 forms a housing of the electronic balance 1 and has a weighing chamber 24 formed therein. The main body 2 includes a lower case 21, a rear case 22, and a windshield case 23.
The lower case 21 is provided at a lower portion (bottom portion) of the main body 2.
The rear case 22 is placed on the rear of the lower case 21. The rear case 22 is formed in a rectangular parallelepiped shape extending vertically.

The windshield case 23 is placed at the center of the lower case 21, and is arranged on the front side of the rear case 22. The windshield case 23 is formed in a hollow rectangular parallelepiped shape that is open at the rear and the bottom. The windshield case 23 is made of, for example, a glass material and is formed to be transparent or translucent. The rear end of the windshield case 23 is in contact with the front end of the rear case 22. The lower end of the windshield case 23 is in contact with the upper end of the lower case 21.
With such a configuration, in the main body 2, a weighing chamber 24 is formed by the lower case 21, the rear case 22, and the windshield case 23.

電 The static eliminator 3 is provided on the rear case 22. The front surface of the static eliminator 3 is exposed from the rear case 22 and faces the weighing chamber 24. The static eliminator 3 is configured to supply ions toward the center of the weighing chamber 24. The static elimination device 3 operates in response to a user operating an operation unit (not shown).

The weighing dish 4 is provided in the weighing chamber 24. Specifically, the weighing dish 4 is provided in the weighing chamber 24 at the center in the front-rear direction and at the center in the width direction. The weighing dish 4 is made of a metal material and formed in a disk shape. The upper surface of the weighing dish 4 constitutes an installation surface. Although not shown, the lower case 21 is provided with a weighing unit (weight sensor). In addition, a dish receiving member for supporting the weighing dish 4 is placed on the weighing section. The weighing dish 4 is placed on the dish receiving member.

Although not shown, the side surface of the windshield case 23 is an open / close door, and the weighing chamber 24 can be opened / closed by sliding the open / close door. When weighing a sample in the electronic balance 1, the user first slides the open / close door (side surface) of the windshield case 23 to open the weighing chamber 24 and weighs the sample container holder 5 (described later). Place on the plate 4 (the upper surface of the weighing plate 4). Then, the user puts the sample into the sample container holder 5 on the weighing dish 4. Further, the user slides the open / close door of the windshield case 23 to close the weighing chamber 24, and operates the operation unit (not shown) to start weighing the sample in a state where the weighing chamber 24 is stable. . Thereafter, the user confirms the numerical value (the weighing content) displayed on the display unit (not shown).

At this time, the user checks the display on the display unit, and if the numerical value displayed on the display unit fluctuates, determines that static electricity is generated in the weighing chamber 24. In this case, the user performs static elimination by operating the static elimination device 3.

2. Configuration of Sample Container Holder FIG. 2 is a perspective view showing the configuration of the sample container holder 5. FIG. 3 is a side view of the sample container holder 5.

The sample container holder 5 is for holding a sample container used for measurement in the electronic balance 1. The sample container holder 5 is a plate-shaped member having a plurality of bent portions, and is made of a metal material. The sample container holder 5 includes a bottom plate 50, a first vertical plate 51, a second vertical plate 52, a third vertical plate 53, a fourth vertical plate 54, and a protruding plate 55.

The bottom plate 50 is formed in a rectangular flat plate shape in plan view. Specifically, the bottom plate 50 is formed in a rectangular shape in a plan view. The bottom plate 50 is an example of a base member. In the following, a direction along the long side of the bottom plate 50 (left-right direction in FIG. 3) will be described as a longitudinal direction, and a direction along a short side of the bottom plate 50 (a direction orthogonal to the longitudinal direction) will be described as an orthogonal direction.

長 A long hole 50A is formed in the bottom plate 50. The long hole 50 A is provided at the center of the bottom plate 50. The long hole 50A is formed in an elliptical shape extending along the longitudinal direction. As described later, the elongated hole 50A functions as a screw hole.

The first vertical plate 51 is formed in a rectangular flat plate shape as viewed from the front, and extends upward (upward) from the center of the bottom plate 50. The first vertical plate 51 is disposed between the second vertical plate 52 and the third vertical plate 53 and the fourth vertical plate 54. A concave portion 51 A is formed on the upper edge (front edge) of the first vertical plate 51. Specifically, the concave portion 51A is formed at the center of the upper edge of the first vertical plate 51. The recess 51 A is formed in a V-shape when viewed from the front, and is recessed downward from the upper edge of the first vertical plate 51. The first vertical plate 51 forms an example of a third holding member.

The second vertical plate 52 extends upward (upward) from a portion of the bottom plate 50 on one side in the longitudinal direction (left side in FIG. 3). The second vertical plate 52 is formed in a rectangular flat plate shape in a front view, and an opening is formed in a part thereof. The second vertical plate 52 is opposed to the first vertical plate 51, and is located on one side in the longitudinal direction (left side in FIG. 3) of the first vertical plate 51. A concave portion 52 A is formed at an upper edge (a distal edge) of the second vertical plate 52. Specifically, the concave portion 52A is formed at the center of the upper edge of the second vertical plate 52. The concave portion 52 A is formed in a V-shape when viewed from the front, and is recessed downward from the upper edge of the second vertical plate 52.

The third vertical plate 53 extends upward (upward) from one edge (left edge in FIG. 3) of the bottom plate 50 on one longitudinal side. The third vertical plate 53 is formed in a rectangular flat plate shape in a front view, and an opening is formed in a part thereof. The third vertical plate 53 is opposed to the second vertical plate 52, and is located on one side in the longitudinal direction (left side in FIG. 3) of the second vertical plate 52. A concave portion 53 A is formed on the upper edge (front edge) of the third vertical plate 53. Specifically, the concave portion 53A is formed at the center of the upper edge of the third vertical plate 53. The recess 53 A is formed in a V-shape when viewed from the front, and is recessed downward from the upper edge of the third vertical plate 53. The second vertical plate 52 and the third vertical plate 53 constitute an example of a first holding member.

The first vertical plate 51, the second vertical plate 52, and the third vertical plate 53 are parallel to each other and in a state parallel to the orthogonal direction (the direction connecting the upper right side and the lower left side in FIG. 2). Extends upward from

寸法 The dimension of the first vertical plate 51 in the orthogonal direction is smaller than the dimension of the second vertical plate 52 in the orthogonal direction. The dimension of the second vertical plate 52 in the orthogonal direction is smaller than the dimension of the third vertical plate 53 in the orthogonal direction. The vertical dimension of the first vertical plate 51 is smaller than the vertical dimension of the second vertical plate 52. The vertical dimension of the second vertical plate 52 is smaller than the vertical dimension of the third vertical plate 53.

That is, the first vertical plate 51, the second vertical plate 52, and the third vertical plate 53 are smaller as the plate is located closer to the center in the longitudinal direction (the vertical dimension and the orthogonal dimension are smaller). ing).

The fourth vertical plate 54 extends upward (upper side) from the other longitudinal edge (the right edge in FIG. 3) of the bottom plate 50. The fourth vertical plate 54 includes a vertical portion 541 and an inclined portion 542.

The vertical portion 541 is formed in a flat plate shape, and extends in the vertical direction and the orthogonal direction. The vertical portion 541 has an opening formed in a part thereof. The vertical portion 541 has a lower end portion formed in a tapered shape tapering upward, and a portion from a central portion to an upper end portion is formed in a rectangular shape extending vertically.

The inclined portion 542 is formed in a flat plate shape, and extends upward in a state of being inclined from the upper end edge of the vertical portion 541. Specifically, the inclined portion 542 is inclined upward from the upper edge of the vertical portion 541 toward the center in the longitudinal direction. A concave portion 54 A is formed at the upper end edge (tip edge) of the inclined portion 542. Specifically, the concave portion 54A is formed at the center of the upper edge of the inclined portion 542. The concave portion 54A is formed in a V-shape when viewed from the front, and is recessed downward (toward the vertical portion 541) from the upper end edge of the fourth vertical plate 54.

The vertical dimension of the fourth vertical plate 54 is larger than the vertical dimension of each of the first vertical plate 51, the second vertical plate 52, and the third vertical plate 53. Specifically, the vertical dimension of the fourth vertical plate 54 is about twice the vertical dimension of the third vertical plate 53. The orthogonal dimension (width in the horizontal direction) of the fourth vertical plate 54 is larger than the orthogonal size (width in the horizontal direction) of the first vertical plate 51. The fourth vertical plate 54 forms an example of a second holding member.

The protruding plate 55 protrudes from the edge of the bottom plate 50 on the other side in the longitudinal direction (the right side in FIG. 3) toward the other side in the longitudinal direction. The protruding plate 55 has a triangular shape in a plan view, and is formed so as to taper toward the other side in the longitudinal direction.

In the sample container holder 5, the first vertical plate 51, the second vertical plate 52, the third vertical plate 53, and the fourth vertical plate 54 are parallel to each other and extend from the bottom plate 50 along the orthogonal direction. It extends upward. That is, as shown in FIG. 3, in the horizontal direction, the direction in which the projected area of the first vertical plate 51, the second vertical plate 52, and the third vertical plate 53 is minimized is the orthogonal direction (in FIG. 3, orthogonal to the paper surface). Direction). In the horizontal direction, the direction in which the projected area of the fourth vertical plate 54 is minimum is the orthogonal direction. Therefore, in the horizontal direction, the direction in which the projected area of the first vertical plate 51, the second vertical plate 52, and the third vertical plate 53 is minimized matches the direction in which the projected area of the fourth vertical plate 54 is minimized. ing.

試料 The sample container holder 5 configured as described above is formed from a single plate-like member. Specifically, the sample container holder 5 having the above-described configuration can be formed by appropriately cutting and bending one plate-shaped member (metal plate). In the sample container holder 5, a direction in which the projected area of the first vertical plate 51, the second vertical plate 52, and the third vertical plate 53 is minimized, and a direction in which the projected area of the fourth vertical plate 54 is minimized. May be slightly shifted. That is, the direction in which the projected area of the first vertical plate 51, the second vertical plate 52, and the third vertical plate 53 is the smallest and the direction in which the projected area of the fourth vertical plate 54 is the smallest are substantially horizontal. It is sufficient that the configurations match.

3. Installation of Sample Container Holder and Sample Container Hereinafter, installation of the sample container holder 5 and the sample container 10 with respect to the electronic balance 1 will be described with reference to FIGS. 4 and 5.

FIG. 4 is a perspective view showing a state where the sample container 10 is placed on the sample container holder 5. FIG. 5 is a side view showing a state where the sample container 10 is placed on the sample container holder 5.

In this example, for example, a flask (a volumetric flask) is used as the sample container 10 with a readout of 0.1 mg. In this example, the sample container 10 which is a flask is used as a container to be mounted on the sample container holder 5, but a container other than a flask such as a test tube can be mounted on the sample container holder 5. In addition, measurement of 0.1 mg or more can be handled by changing the shape of the sample container holder 5 according to the size of the sample container.

The sample container 10 includes a bottom portion 101, a neck portion 102, and a tubular portion 103. The bottom 101 is formed in a spherical shape. The lower surface (bottom surface) of the bottom portion 101 is formed in a planar shape. The neck 102 is formed in a tubular shape, and is continuous with the upper end of the bottom 101. The neck 102 is formed so as to taper upward. The tubular portion 103 is formed in a tubular shape, and extends upward from the upper end of the neck portion 102 with a constant diameter. The internal space at the upper end of the tubular portion 103 forms an inlet for introducing a sample. The neck 102 of the sample container 10 constitutes an example of the second portion. Further, a portion on one side in the longitudinal direction (left side in FIG. 5) of the bottom portion 101 of the sample container 10 constitutes an example of a first portion. A portion on the other side in the longitudinal direction (the right side in FIG. 5) of the bottom portion 101 of the sample container 10 (a portion near the lowermost portion) forms an example of a third portion.

When installing the sample container holder 5 and the sample container 10 in the main body 2, first, the user slides the opening / closing door (side surface of the main body 2) of the windshield case 23 to open the weighing chamber 24, and The sample container holder 5 is placed on 4.

At this time, as shown in FIG. 5, the user places the sample container holder 5 on the weighing dish 4 such that the bottom plate 50 of the sample container holder 5 is brought into close contact with the upper surface of the weighing dish 4. In addition, the user can set the orthogonal direction (the direction in which the first vertical plate 51, the second vertical plate 52, the third vertical plate 53, and the fourth vertical plate 54 extend) in the sample container holder 5, the static eliminator 3, and the sample container holding device. The sample container holder 5 is placed on the weighing dish 4 so that the facing direction of the sample 5 coincides. That is, each of the first vertical plate 51, the second vertical plate 52, the third vertical plate 53, and the fourth vertical plate 54 extends parallel to the supply direction of ions from the static eliminator 3 (to coincide with each other). 2) and placed on the weighing dish 4. In other words, when viewed in the supply direction of the ions from the static eliminator 3, the projected area of each of the first vertical plate 51, the second vertical plate 52, the third vertical plate 53, and the fourth vertical plate 54 is minimized. Has become.

Although not shown, a screw hole is formed in the center of the weighing dish 4. As described above, the user adjusts the position of the sample container holder 5 so that the screw hole of the weighing dish 4 and the elongated hole 50A of the sample container holder 5 overlap in the vertical direction. Place. Then, a screw is fitted into the long hole 50A of the sample container holder 5 and the screw hole of the weighing dish 4, and the sample container holder 5 is fixed to the weighing dish 4. The sample container holder 5 may be placed on the weighing dish 4 in a state where the sample container holder 5 is not fixed to the weighing dish 4 (not fixed with screws). In this state, the protruding plate 55 functions as a stopper for preventing the sample container holder 5 from falling down.
Then, the user places the sample container 10 on the sample container holder 5 installed on the weighing dish 4.

Specifically, the user may be able to support a portion of the bottom 101 on one side in the longitudinal direction (left side in FIG. 5) with the second vertical plate 52 and the third vertical plate 53, and on the other side of the bottom 101 in the longitudinal direction (see FIG. The sample container 10 is placed on the sample container holder 5 such that the portion (right side in FIG. 5) is supported by the first vertical plate 51 and the neck 102 is supported by the fourth vertical plate 54.

At this time, the sample container 10 is held by the sample container holder 5 in a state where the axial direction is inclined with respect to the vertical direction. The inlet of the tubular portion 103 of the sample container 10 is located near the opening / closing door (side surface of the main body 2) of the windshield case 23 of the electronic balance 1. Further, the bottom portion 101 of the sample container 10 is in a state of being lifted from the upper surface (installation surface) of the weighing dish 4 (a state of being spaced upward).

The neck portion 102 of the sample container 10 is supported at two points by the concave portions 54A of the fourth vertical plate 54, and the bottom portion 101 of the sample container 10 has the concave portions 51A of the first vertical plate 51, the concave portions 52A of the second vertical plate 52, Further, each of the concave portions 53A of the third vertical plate 53 is supported at two points.

With the sample container 10 placed on the sample container holder 5 in this manner, the user introduces the sample into the sample container 10 from the upper end (inlet) of the tubular portion 103 of the sample container 10. . As described above, since the introduction port of the sample container 10 is located near the opening / closing door (side surface of the main body 2) of the windshield case 23 of the electronic balance 1 (because the introduction port is close to the user side), A sample can be easily introduced into the sample container 10.

When the measurement is performed with the sample introduced into the sample container 10 and the numerical value displayed on the display unit (not shown) fluctuates, the user generates static electricity in the weighing chamber 24. Judge that In this case, the user operates the operation unit (not shown) to operate the static eliminator 3.

Then, ions are supplied from the static eliminator 3 toward the sample container 10. As described above, when viewed in the supply direction of the ions from the static eliminator 3, the projected area of each of the first vertical plate 51, the second vertical plate 52, the third vertical plate 53, and the fourth vertical plate 54 is minimum. It has become. Therefore, it is possible to prevent the first vertical plate 51, the second vertical plate 52, the third vertical plate 53, and the fourth vertical plate 54 from hindering the movement of ions. Ions from the static eliminator 3 pass between the bottom 101 of the sample container 10 and the weighing dish 4. At that time, the ions from the static eliminator 3 move along the surfaces of the first vertical plate 51, the second vertical plate 52, and the third vertical plate 53. Thus, the ions supplied from the static eliminator 3 move smoothly between the bottom 101 of the sample container 10 and the weighing dish 4.

In the case where only charge removal is intended, the sample container holder 5 can be placed on the weighing dish 4 in a manner different from the above arrangement. When performing the weighing operation, it is preferable that the inlet of the sample container 10 is located near (facing) the opening / closing door (side surface of the main body 2) of the windshield case 23 of the electronic balance 1.

4. FIG. 6 shows a state in which the sample container 10 is held by the sample container holder 5 and the sample container holder 5 and the sample container 10 are arranged in the main body 2 to perform static elimination. 4 is a graph showing the charge amount of the sample container 10 when the sample container 10 is removed, and the charge amount of the sample container 10 when only the sample container 10 is disposed in the main body 2 and static elimination is performed.

In FIG. 6, A indicates that the sample container 10 is held by the sample container holder 5 and the sample container 10 is charged when the sample container holder 5 and the sample container 10 are disposed in the main body 2 and static elimination is performed. B indicates the charge amount of the sample container 10 when only the sample container 10 is disposed in the main body 2 and static elimination is performed. In FIG. 6, the horizontal axis indicates the charge amount before performing the charge removing operation, and the vertical axis indicates the charge amount after performing the charge removing operation.

6, when the sample container 10 is held by the sample container holder 5 and the sample container holder 5 and the sample container 10 are arranged in the main body 2 and static elimination is performed, only the sample container 10 is removed. It can be seen that the static elimination effect is higher than when the static elimination is performed by arranging in the main body 2.

5. Operation and Effect (1) According to the present embodiment, as shown in FIG. 5, the sample container holder 5 includes a first vertical plate 51, a second vertical plate 52, and a fourth vertical plate 54. When holding the sample container 10 using the sample container holder 5, the second vertical plate 52 and the third vertical plate 53 hold a portion of the bottom 101 on one side in the longitudinal direction (left side in FIG. 5). The neck 102 is held by the fourth vertical plate 54. Also, since the vertical dimension of the fourth vertical plate 54 is larger than the vertical dimension of the second vertical plate 52 and the third vertical plate 53, the sample container holder 5 holds the sample container 10 in an inclined state. Will be retained.
Therefore, when various sample containers 10 are held by the sample container holder 5, the sample containers 10 can be held in a stable state, and operability can be improved. That is, the sample container 10 can be stably held in a state where the weighing operation is easy.

The sample container 10 is held by the sample container holder 5 with the bottom 101 floating.
Therefore, when the sample container holder 5 and the sample container 10 are set in the main body 2 of the electronic balance 1 in a state where the sample container 10 is held by the sample container holder 5, the bottom 101 of the sample container 10 and the weighing pan 4 And a certain space can be formed between them.
As a result, when ions for static elimination are generated in the main body 2 of the electronic balance 1, the ions can reach the bottom 101 (bottom surface) of the sample container 10. Static elimination can be performed.

That is, since a gap can be secured between the weighing dish 4 and the bottom 101 of the sample container 10, ions generated by the static eliminator 3 can be delivered to the bottom 101 of the sample container 10.
In the sample container holder 5, a direction in which the projected area of the second vertical plate 52 and the third vertical plate 53 in the horizontal direction is minimized, and a direction in which the projected area of the fourth vertical plate 54 in the horizontal direction is minimized. Approximately match. In the electronic balance 1, the sample container holder 5 is installed so that these directions substantially coincide with the supply direction of the ions from the static eliminator 3. That is, in the electronic balance 1, when viewed in the supply direction of the ions from the static eliminator 3, the projected area of the second vertical plate 52 and the third vertical plate 53 is minimum, and the projected area of the fourth vertical plate 54. Is minimal.

Therefore, the movement of the ions supplied from the static eliminator 3 can be suppressed from being hindered by the second vertical plate 52, the third vertical plate 53, and the fourth vertical plate 54.
As a result, ions supplied from the static eliminator 3 can be smoothly moved between the bottom 101 of the sample container 10 and the weighing dish 4.
Therefore, the charge elimination device 3 can smoothly remove the charge from the sample container 10. Then, in the electronic balance 1, it is possible to accurately measure the sample.

(2) According to the present embodiment, the sample container holder 5 includes the first vertical plate 51 as shown in FIG. The first vertical plate 51 is disposed between the second vertical plate 52, the third vertical plate 53, and the fourth vertical plate 54, and holds (supports) the bottom portion 101 of the sample container 10 at its leading edge. The vertical dimension of the first vertical plate 51 is smaller than the vertical dimension of the second vertical plate 52 and the third vertical plate 53.

Therefore, the sample container 10 can be kept in a more stable state.
Further, since the sample container 10 can be supported from below by the first vertical plate 51, the sample container 10 can be kept in a more stable state.

(3) According to the present embodiment, as shown in FIG. 2, the width of the first vertical plate 51 in the horizontal direction is smaller than the width of the second vertical plate 52 and the third vertical plate 53 in the horizontal direction. .
Therefore, the sample container holder 5 can more stably hold the sample containers 10 of various sizes and shapes.

(4) According to the present embodiment, as shown in FIG. 2, in the sample container holder 5, the first vertical plate 51, the second vertical plate 52, the third vertical plate 53, and the fourth vertical plate 54 are formed. Each is formed in a plate shape (flat plate shape).
Therefore, in the sample container holder 5, each of the first vertical plate 51, the second vertical plate 52, the third vertical plate 53, and the fourth vertical plate 54 can be simply configured.

(5) According to the present embodiment, as shown in FIG. 2, in the sample container holder 5, a concave portion 51 A is formed at the distal end edge of the first vertical plate 51, and the distal end of the second vertical plate 52 is formed. A concave portion 52A is formed at the edge, a concave portion 53A is formed at the distal end edge of the third vertical plate 53, and a concave portion 54A is formed at the distal end edge of the fourth vertical plate 54.

When the sample container 10 is held by the sample container holder 5, the bottom 101 of the sample container 10 includes the concave portion 51A of the first vertical plate 51, the concave portion 52A of the second vertical plate 52, and the third vertical plate 53. The two concave portions 53A of the fourth vertical plate 54 support the neck 102 of the sample container 10 at two points.
Therefore, the sample container 10 can be held in a more stable state by the sample container holder 5.

(6) According to the present embodiment, the sample container holder 5 is formed from a single plate-like member. That is, the first vertical plate 51, the second vertical plate 52, the third vertical plate 53, the fourth vertical plate 54, and the bottom plate 50 are formed from a single plate-like member.
Since the sample container holder 5 is formed from a single plate-like member, it can be manufactured at low cost and can be adapted to various types of containers. Further, workability can be improved.

6. Second Embodiment Hereinafter, a second embodiment of the present invention will be described with reference to FIG. In addition, about the structure similar to 1st Embodiment mentioned above, description is abbreviate | omitted by using the same code | symbol as the above.
FIG. 7 is a perspective view showing a configuration of the sample container holder 5 according to the second embodiment of the present invention.

In the above-described first embodiment, the members (the first vertical plate 51, the second vertical plate 52, the third vertical plate 53, and the fourth vertical plate 54) extending upward from the bottom plate 50 are formed in a plate shape. I have. On the other hand, in the second embodiment, the member extending upward from the bottom plate 50 is formed in a rod shape.

Specifically, in the second embodiment, a first rod 61 is provided in place of the first vertical plate 51, a second rod 62 is provided in place of the second vertical plate 52, and a third vertical plate 53 is provided. , A third rod 63 is provided, and instead of the fourth vertical plate 54, a fourth rod 64 is provided.
The first rod 61 is formed in a rod shape, and extends upward (upward) from the center of the bottom plate 50. The two first rods 61 are provided so as to be spaced apart in the orthogonal direction.

The second rod-shaped body 62 is formed in a rod shape, and extends upward (upper side) from a portion of the bottom plate 50 on one longitudinal side (upper left side in FIG. 7). The second rod-shaped body 62 is located on one longitudinal side of the first rod-shaped body 61. The two first rods 61 are provided so as to be spaced apart in the orthogonal direction.

The third rod 63 is formed in a rod shape, and extends upward (upper side) from one longitudinal edge of the bottom plate 50 (upper left edge in FIG. 7). The third rod 63 is located on one longitudinal side of the second rod 62. Two third rods 63 are provided so as to be spaced apart in the orthogonal direction.

The fourth rod-shaped body 64 is formed in a rod shape, and extends upward (upper side) from the other longitudinal edge (lower right edge in FIG. 7) of the bottom plate 50. Two fourth rods 64 are provided so as to be spaced apart in the orthogonal direction.

The vertical dimension of the first rod 61 is smaller than the vertical dimension of the second rod 62. The vertical dimension of the second rod 62 is smaller than the vertical dimension of the third rod 63. The vertical dimension of the third rod 63 is smaller than the vertical dimension of the fourth rod 64.
When the sample container 10 is held by the sample container holder 5, the bottom portion 101 of the sample container 10 includes two first rods 61, two second rods 62, and two third rods 63. , And the neck 102 of the sample container 10 is supported at two points by two fourth rods 64.

As described above, in the second embodiment, as shown in FIG. 7, in the sample container holder 5, members (the first rod 61, the second rod 62, and the third rod 62) extending upward from the bottom plate 50. 63 and the fourth bar 64) are formed in a bar shape.
Therefore, in the sample container holder 5, the strength of the member holding the sample container 10 can be increased.

7. Modifications In the first embodiment described above, the first vertical plate 51, the second vertical plate 52, the third vertical plate 53, and the fourth vertical plate 54 have been described as extending upward from the bottom plate 50. In the above-described second embodiment, the first rod 61, the second rod 62, the third rod 63, and the fourth rod 64 are described as extending upward from the bottom plate 50. However, these members need only be configured to extend upward from the bottom plate 50. That is, these members may extend upward from the bottom plate 50 in a state inclined with respect to the vertical direction.

In the above-described first embodiment, all members extending upward from the bottom plate 50 are plate-shaped. In the above-described second embodiment, all the members extending upward from the bottom plate 50 have been described as being rod-shaped. However, in the member extending upward from the bottom plate 50, a plate-shaped member and a rod-shaped member may be mixed.

In addition, in the above-described embodiment, the number (number) of members extending upward from the bottom plate 50 can be arbitrarily changed.

In the above embodiment, the sample container holder 5 is described as being installed on the weighing dish 4. However, the weighing dish 4 may be removed from the dish receiving member, and the sample container holder 5 may be mounted on the dish receiving member. In this case, the upper surface of the dish receiving member is the installation surface.

Furthermore, the sample container holder 5 may be used in the electronic balance 1 so as to be hung by a dedicated mechanism (without being placed on the weighing dish 4). In this case, the direction of the plane along the bottom plate 50 of the sample container holder 5 is the horizontal direction.

REFERENCE SIGNS LIST 1 electronic balance 2 main body 3 static eliminator 5 sample container holder 10 sample container 24 weighing chamber 51 first vertical plate 51A concave portion 52 second vertical plate 52A concave portion 53 third vertical plate 53A concave portion 54 fourth vertical plate 54A concave portion 101 bottom portion 102 Neck 103 Tubular part 541 Vertical part 542 Inclined part

Claims

A sample container holder for holding a sample container used for weighing in an electronic balance,
A base member,
A first holding member extending upward from the base member and holding a first portion of the sample container at a leading edge thereof;
A second holding member that extends upward from the base member, is arranged at a distance from the first holding member, and holds a second portion of the sample container at a leading edge thereof;
The vertical dimension of the second holding member is larger than the vertical dimension of the first holding member,
A sample container holder, wherein a direction in which the projected area of the first holding member in the horizontal direction is minimum and a direction in which the projected area of the second holding member in the horizontal direction is minimum substantially coincide with each other.
A third holding member that extends upward from the base member, is disposed between the first holding member and the second holding member, and holds a third portion of the sample container at a leading edge thereof. Prepare,
The sample container holder according to claim 1, wherein the vertical dimension of the third holding member is smaller than the vertical dimension of the first holding member.
The sample container holder according to claim 2, wherein the third holding member supports a bottom portion of the sample container.
The sample container holder according to claim 2, wherein the width of the third holding member in the horizontal direction is smaller than the width of the first holding member in the horizontal direction.
The sample container holder according to claim 2, wherein at least one of the first holding member, the second holding member, and the third holding member is formed in a plate shape.
The sample according to claim 5, wherein a concave portion is formed at a leading edge of a plate-shaped member of the first holding member, the second holding member, and the third holding member. Container holder.
6. The sample container holder according to claim 5, wherein the first holding member, the second holding member, the third holding member, and the base member are formed from a single plate-shaped member.
The sample container holder according to claim 2, wherein at least one of the first holding member, the second holding member, and the third holding member is formed in a rod shape.
A sample container holder according to claim 1,
A main body in which a weighing chamber in which the sample container holder is accommodated,
A static eliminator provided on the main body, for eliminating ions in the weighing chamber by supplying ions into the weighing chamber,
An electronic balance, wherein the projected area of the first holding member is minimized and the projected area of the second holding member is minimized when viewed in a supply direction of ions from the static eliminator.