JPH031777Y2 - - Google Patents

Description

[Detailed description of the invention] (a) Industrial application field This invention relates to an improvement of a weighing device that performs automatic weighing in a hooded balance.

(b) Prior Art The weighing of analytical samples for gas chromatographs and the like is usually carried out in units of several μ to mg, so it is carried out using a hooded balance to avoid being affected by the outside air. In addition, in order to automatically take in and out reagent bottles, which are the objects to be weighed, using a laboratory auto, etc., it is necessary to open and close the hood, and if this opening/closing operation was performed by a robot, etc., there was a problem that the operation would be extremely complicated. . Furthermore, it is not preferable that vibrations generated when the hood is opened and closed reach the weighing mechanism.

(c) Purpose This invention was made in view of the above points, and aims to provide a weighing device that can perform weighing without opening or closing the hood.

(d) Structure In this invention, a guide cylinder is inserted into the hood in an airtight manner, and the object to be weighed is taken in and taken out using this guide cylinder.
Its more detailed structure consists of a balance mechanism consisting of a balance section, a hood that is provided to cover the balance section and has an opening for putting in and taking out objects to be weighed on the top surface, and an internal structure from which the hood opens for inserting objects to be weighed. A guide tube that is inserted into the guide tube and has a sealing lid that can be opened and closed by an external force at its lower end, an object for taking in and taking out objects to be weighed that moves up and down within the guide tube and has a function to hold objects to be weighed at the lower end, and a guide tube. This is a weighing device that includes an automatic operation mechanism for objects to be weighed, and a base body that supports the objects in a predetermined position and operates a body for loading and unloading the objects to be weighed.

(e) Examples Examples of this invention will be described below in detail with reference to the drawings, but this invention is not limited to the following examples.

FIG. 1 shows the overall configuration, with reference numeral 1 a base, 2 a balance section, and 3 a hood, and these three components constitute a balance mechanism. A display section 4 is provided on the front surface of the base 1, and an electric element for weighing is incorporated inside. As shown in the figure, a reagent bottle 5, which is an object to be weighed, is placed on the balance section 2. food 3
is provided on the base 1 to cover the balance section 2,
An opening 7 for loading and unloading objects to be weighed is provided at the center of the upper surface 6 at a position facing the balance section 2. A sealing member 8 made of an elastic material is attached to the opening edge of this opening 7 for taking in and out.

9 is a guide tube, 10 is a body for putting in and taking out objects to be weighed, 1
1 is a base, and these three components constitute an automatic operation mechanism for the object to be weighed. The lower end of the guide tube 9 is covered with a sealing lid 12 made of an elastic material and provided with a notch. Due to the above-described structure, the sealing lid 12 can be opened and closed by external force, that is, it opens when there is an object passing through it, and is sealed when there is no object passing through. The loading/unloading body 10 has a suction cup 1 at its lower end that serves to hold the object to be weighed.
3, and an air pipe 14 at its upper end.
is connected. The inside of the receptacle 10 is communicated from the upper end to the lower end, that is, connected to the other end of the air pipe 14. When the suction pump operates, the suction cup 13 attracts the object to be weighed. Base body 11
consists of an air cylinder 15 and a plunger 16 that operates inside the air cylinder 15, and the guide tube 9 has its arm portion 9' end located above the air cylinder 15.
The loading/unloading body 10 is fixedly attached at its arm portion 10' end to the upper part of the plunger 16, respectively. The plunger 16 reciprocates in the direction of the arrow due to the change in pressure within the air cylinder 15.

The weighing operation in this device will be explained below.

A predetermined reagent bottle 5 is held by the suction cup 13 in a state in which the plunger 16 extends from inside the air cylinder 15 and the take-out body 10 is positioned outward from the inside of the guide tube 9. Next, as the plunger 16 moves into the air cylinder 15, the loading/unloading body 10 enters the guide tube 9, and the reagent bottle 5 at its tip pushes open the airtight lid 12, and the bottom surface of the reagent bottle 5 touches the balance. The plunger 16 stops when it is in contact with the upper surface of the balance section 2, and at the same time the holding function of the suction cup 13 is removed, so that the reagent bottle 5 is placed on the balance section 2. Then, by the operation of the plunger 16 again, the loading/unloading body 10 is raised to a position above the sealing lid 12, and weighing is performed in this state. In the state where the loading/unloading body 10 is located above the sealing lid 12, the sealing lid 1
2 and the sealing member 8, the space inside the hood 3 is completely shut off from the outside air.

(f) Effects This idea is structured as described above, so
The object to be weighed can be put in and taken out without opening or closing the hood, and the space inside the hood is completely shut off from the outside air during weighing, so that good weighing results can be obtained without being affected by the outside air.

Furthermore, even if the object to be weighed comes into contact with the sealing lid of the guide cylinder when it is inserted, vibrations are not directly transmitted to the balance mechanism, and weighing can be carried out immediately without waiting for the balance to stabilize.

[Brief explanation of the drawing]

FIG. 1 is a configuration diagram including a partial cross section of the weighing device of this invention. 1...base, 2...balance section, 3...hood,
5...Reagent bottle (object to be weighed), 6...Top part, 7
...Insertion/removal opening, 8...Sealing member, 9...Guide cylinder, 10...Insertion/removal body, 11...Base, 12
... Sealing lid, 13... Suction cup (holding function).

Claims (1)

[Scope of utility model registration request] A balance mechanism consists of a balance section, a hood that is provided to cover the balance section and has an opening for loading and unloading the object to be weighed on the top surface, and a hood that is inserted into the interior through the opening for inserting the object to be weighed in the hood. A guide cylinder having a sealing lid that can be opened and closed by an external force at the lower end, a weighing object loading/unloading body that moves up and down within the guide cylinder and has a function of holding the weighed object at the lower end, and supporting the guide cylinder at a predetermined position. A weighing device consisting of a base body that operates a body for loading and unloading objects to be weighed, and an automatic operation mechanism for objects to be weighed.