JP5105489B2 - Windproof, moistureproof, dripproof and dustproof structure of electronic balance - Google Patents

Description

  The present invention relates to a wind-proof (windproof), moisture-proof, drip-proof, and dust-proof structure of a mass measuring device, and in particular, a measuring unit that measures the mass of an object to be measured and a display unit that displays measurement data measured by the measuring unit are separated. The present invention relates to a windproof / dustproof / dripproof / moistureproof structure suitable for a separated mass measuring apparatus.

  In an electromagnetic balance type balance generally called an electronic balance or a load cell balance (hereinafter, these mass meters are collectively referred to as an “electronic balance”) and the like, those having a minimum measured value of 1 μg are also provided. In such an electronic scale that can measure a minute amount, it is easily affected by the measurement environment. For example, in the case of an electronic scale with a minimum display of 10 mg or less, the weighing pan is swollen by air flow accompanying movement of an air conditioner or a person. As a result, the measurement value is not stable, or the measurement operation itself becomes impossible.

From such a viewpoint, a windshield structure, a moistureproof structure, a dustproof structure and the like as described in the following patent documents have been proposed.
JP2009-036583 JP-A-9-043041 JP-A-8-166280 JP2006-073391 JP 2008-116224 A

Among the above-mentioned patent documents, 1 to 3 are mainly inventions related to windshield structures, and 4 and 5 are mainly inventions related to waterproof and dustproof structures.
In addition, as a technical matter common to all the above-mentioned inventions, the device to which these inventions are implemented is a conventionally proposed single-type electronic scale, that is, a weighing mechanism and the measurement result of this weighing mechanism. Or an electronic balance in which a display unit for performing various settings is configured as a single unit.

  Here, in the electronic balance, a measuring unit for measuring the mass of the object, a display unit provided with an input unit for displaying measurement data measured by the measuring unit and for performing various settings associated with measurement such as taring. Are individually separated, and a mass measuring device (hereinafter referred to as “separated mass measuring device”) in which both are connected by a signal cable has been proposed and actually used.

  The use of the separation type mass measuring device is a measurement environment space that is arranged by placing only the weighing unit in a space where the measurement environment such as temperature, humidity, and pressure (pressure) is arranged, and placing the display unit outside this environment. To reduce the cost of maintaining the measurement environment space, or conversely when the object to be weighed is a dangerous substance such as a radioactive material, the weighing unit is placed in a sealed space to ensure safety during measurement. It is used effectively when

Recently, it is installed in various production lines and is used as an apparatus for automatically measuring a predetermined sample.
In this case, dozens or dozens of measuring units are arranged close to the production line to improve work efficiency. For this reason, the shape of the measuring portion is configured in a small and simple shape such as a substantially rectangular parallelepiped as shown in FIG.

  In the measuring section of the separation type mass measuring device arranged on the production line, the measurement of the sample is performed using a specific mechanism such as using a robot arm or using a special dropping device. For this reason, the structure of providing a windshield room with a door is not practically usable because it requires a careful opening and closing operation by hand, and a windshield structure that enables operation by a robot arm or the like with the weighing pan open. It is necessary to.

  In addition, it is difficult to require delicate human movements for operations by devices such as robots, and it is highly moisture-proof assuming that the mass of powder or liquid is spilled during the operation of these devices. It is necessary to have a structure that is dustproof and that can be easily cleaned later.

  With respect to the above points, in each invention described in the above-mentioned patent documents, which is not premised on an operation by an automatic device such as a robot, the device is naturally presumed to be operated manually, so that a high degree of delicateness is required for the operation, or Each of the windshield structures is difficult to implement on a production line or the like, such as a large windshield structure or a difficulty in cleaning.

The present invention has been configured in view of the above problems.
That is, the invention of the present application is characterized by a windproof, moistureproof, dripproof and dustproof structure that can be effectively implemented particularly on the measuring section of the separation type mass measuring apparatus.

Specifically , the present invention relates to a diaphragm that transmits a load of a sample to a measuring mechanism inside the measuring unit and seals the penetrating portion of the load receiver having a penetrating portion that penetrates the inside of the measuring unit and the outside of the measuring unit. And a cover member that protects the diaphragm , a windshield member that is attached to the upper portion of the cover member, a dish receiving member that is connected to a load receiver around which the windshield member is disposed, and is placed on the dish receiving member A windproof, moistureproof, dripproof and dustproof mechanism for an electronic balance, characterized by comprising a weighing pan .

The diaphragm can be more that for sealing around the penetrating portion of the load receptor, the sample is a liquid or powder is effectively prevented from entering the metering section.

Also, more the use of the diaphragm as much as possible reduce the thickness, while configured not to inhibit the performance of the balance, the diaphragm, it is possible to protect the vulnerable thin diaphragm for being covered by the cover portion .

The circumference of the weighing pan is surrounded by the wall of the draft shield member , wind protection measures are applied to the side of the weighing pan, and the upper part of the weighing pan is open, so even if the weighing unit is installed on the production line , the robot The device such as the arm can easily put a sample in and out of the weighing pan without complicated operations such as opening and closing the door.

Hereinafter, an embodiment of the present invention will be described in detail with reference to FIG.
In FIG. 1, the code | symbol 1 shows the measurement part main body which incorporates a measurement mechanism in a casing among separation-type mass measuring devices. Hereinafter, the term “measuring unit body” includes a casing and a measuring mechanism housed in the casing unless otherwise specified. The weighing unit body 1 is connected to a display unit (not shown) via a communication cable, and the measurement value of the sample measured by the weighing unit body 1 is output and displayed on the display unit via the communication cable. When the separation type mass measuring device is used in the production line, only a number of measuring unit main bodies 1 are arranged on the production line, and the sample is automatically measured.

Reference numeral 2 denotes a load transmitting member, reference numeral 2A in the insertion member, is connected to the load transfer member 2, and is connected to the metering unit load measuring mechanism provided inside the main body 1 (not shown) . Reference numeral 3 is a diaphragm as a moisture-drip-proof member, flexibility such as urethane rubber, while being formed of a material having elasticity, so that its elasticity does not affect the measurement of the load thin Is formed. Since the diaphragm 3 is rich in stretchability, the opening 3A formed at the center is widened to insert the load transmitting member 2 attached in advance to the measuring unit main body 1 side, and the opening 3A is inserted into the insertion member 2A. The diaphragm 3 is brought into close contact with the diaphragm mounting surface 1A so as to cover the periphery of the diaphragm.

  If the diaphragm 3 is disposed in close contact with the diaphragm contact surface 1A, the diaphragm cover 4 is disposed on the upper surface of the diaphragm 3, and a screw (not shown) is measured through the insertion hole 4a of the diaphragm cover 4 and the insertion hole 3a of the diaphragm 3. The diaphragm 3 is fixed to the measuring unit main body 1 through the diaphragm cover 4 by being screwed into the screw hole 1 a formed in the main body 1, and the diaphragm 3 is protected by the diaphragm cover 4. By providing the diaphragm cover 4, the diaphragm 3 can be formed thinly to ensure the performance of the electronic scale without considering the vulnerability.

Reference numeral 5 denotes a windshield member. As shown in FIGS. 2 and 3, the windshield member 5 has a structure in which wall surfaces are formed on four sides. Among these, 5A and 5A are a pair of opposing wall surfaces, the lower end edge is a wall surface located on the upper surface of the weighing unit main body 1, and the other opposing wall surfaces 5B and 5B are the opposite side walls of the weighing unit main body 1. It is a wall surface along 1B and 1B, Comprising: The lower part is comprised so that it may hang down from the upper surface of the said measurement part main body 1, For this reason, it is formed wider in the up-down direction than the said wall surface 5A, 5A.

Reference numeral 5C denotes a member (hereinafter referred to as a “fixing member”) that is extended from one wall surface 5A of the wall surfaces 5A and 5A to the outside of the windshield member 5, and includes an insertion hole 5Ca of the fixing member 5C. The windshield member 5 is fixed to the measuring unit main body 1 by screwing the inserted screw 8 into a screw hole 1 </ b> C formed in the measuring unit 1. Further, if the fixing screw 8 is a screw that can be turned manually as shown in the figure, the windshield member 5 can be easily attached to and detached from the measuring unit main body 1 without using a special tool.

Reference numeral 5D denotes a cover portion that is arranged across the wall surfaces 5B and 5B inside the windshield member 5 formed by the four wall surfaces 5A and 5B. The cover portion is formed in a substantially cross shape on the plane and has an opening 5Da at the center. (See also FIG. 2).

Further, the side of the cross-shaped cover portion that is connected to the wall surfaces 5B and 5B is inclined surfaces 5Db and 5Db that descend toward the wall surfaces 5B and 5B with the opening 5Da as a vertex (see FIG. 3).

Next, returning to FIG. 1, by attaching the windshield member 5 to the measuring unit main body 1 in the above-described manner, the load transmitting member 2 attached in advance to the measuring unit main body 1 side has the opening 4 </ b> A of the diaphragm cover 4, the windshield. The windshield member 5 is exposed through the opening 5Da of the member 5. In this state, the engagement protrusion 6A protruding from the back surface of the dish receiving member 6 is inserted into and engaged with the engagement hole 2B of the load transmitting member 2 exposed through the opening 5Da of the windshield member 5, whereby the dish receiver The member 6 and the load transmission member 2 are integrated.

The attachment of the dish receiving member 6 to the load transmitting member 2 can be achieved simply by inserting and engaging the engaging protrusion 6A into the engaging hole 2B of the load transmitting member 2. In order to be strong and reliable, screws (not shown) are screwed into the screw holes 2 a and 2 a of the load transmission member 2 through insertion holes 6 a and 6 a formed in the dish receiving member 6.

  By placing the weighing pan 7 on the tray receiving member 6 in this state, a mechanism having windproof, moistureproof, dripproof and dustproof functions and transmitting the load of the sample on the weighing unit body 1 to the weighing mechanism is completed. .

In the completed state, as shown in FIGS. 4 and 5, most of the cover portion 5 </ b> D of the windshield member 5 is covered with the weighing pan 7, but even if a liquid sample is spilled, this sample is not covered by the windshield member 5. It drops on the lower part of the windshield member 5, that is, the diaphragm cover 4 through a space formed between the wall surfaces 5A and 5B, and between the wall surfaces 5B and 5B of the windshield member 5 and the side wall 1B of the measuring unit main body 1. Since a slight gap is formed, the liquid flows down through this gap. Even if a part of the sample drops through the opening 4 </ b> A of the diaphragm cover 4, the liquid is prevented from entering the measuring unit main body 1 by the diaphragm 3.

When the sample is powder, it is easier to protect, and even if the powder spills, it usually only falls on the surface of the diaphragm cover 4, so the pan support member 6 is removed when the production line is stopped. In addition, the powder can be easily cleaned by removing the screw 8 and removing the windshield member 5.

  Although the present invention has been described above by taking the separation-type mass measuring device as an example, it can be naturally applied to a mass measuring device in which the weighing unit and the display unit are integrally configured.

FIG. 3 is an exploded perspective view of a windproof, moistureproof, dripproof and dustproof structure for a measuring unit main body according to an embodiment of the present invention. It is a top view of a windshield member. It is sectional drawing by the AA line of FIG. It is a side view of the main part of a measuring part which gave windproof, dampproof, dripproof, and dustproof structure. It is a top view of the measurement part main body which gave windproof, dampproof, drip-proof, and dustproof structure.

DESCRIPTION OF SYMBOLS 1 Metering unit main body (of a separation-type mass measuring apparatus) 1A (Measurement unit main body) Diaphragm mounting surface 1a (For attaching a diaphragm cover) Screw hole 1B (Measuring unit main body) Side wall 1C (For windshield member body mounting) Screw hole 2 Load transmission mechanism 2A (load transmission mechanism) insertion member 2a (for mounting the tray support member) screw hole 2B (load transmission mechanism) engagement hole 3 Diaphragm 3A (diaphragm) opening 3a (diaphragm) screw insertion Hole 4 Diaphragm cover 4A (diaphragm cover) opening 4a (diaphragm cover) screw insertion hole 5 Windshield member 5A (windshield member) wall surface 5B (windshield member) wall surface (wall surface in contact with measuring unit main body 1B)
5C (windshield member) fixing member 5D (windshield member) cover portion 5Da (cover portion) opening 5Db (cover portion) slope portion 6 Plate receiving member 6A (plate receiving member) engaging protrusion 6a (plate receiving portion) Screw insertion hole of material 7 Weighing pan
8 Screws to fix the draft shield member to the measuring unit body

Claims (5)

In an electronic balance that transmits a load of a sample placed on a weighing pan to a weighing mechanism in a casing via a load transmitting member and an insertion member that forms part of the load transmitting member.
A diaphragm 3 is disposed on the insertion member 2A of the load transmission member 2 so as to surround the insertion member 2A, a diaphragm cover 4 is disposed on the upper part of the diaphragm 3, and a windshield member 5 is disposed on the upper part of the diaphragm cover 4. is, the load transmission member 2 has an upper end exposed to arrange windshield member 5 around is pan support member 6 is connected, an electronic weigher weighing pan 7 with respect to pan support member 6 is configured to be placed Windproof, moistureproof, dripproof and dustproof structure
The casing incorporating the measuring mechanism is a measuring unit main body 1 that forms part of a separation-type mass measuring device, and the four sides of the windshield member 5 are configured as opposing wall surfaces 5A, 5A, 5B, and 5B. The lower surfaces of the wall surfaces 5B and 5B along the side wall 1B of the main part 1 hang down from the side wall 1B of the measuring part main body 1, and a slight gap is formed between the hanging part and the measuring part main part side wall 1B. wind, moisture-proof and drip-proof and dustproof structure of an electronic scale, characterized in that is. The cover 5D is disposed in the windshield member 5, and an opening 5Da through which the upper end of the load transmitting member 2 is exposed is formed at the approximate center of the cover 5D . Windproof, moistureproof, dripproof and dustproof structure of electronic balance. The cover portion 5D is formed in a substantially cross-shaped plane, and the side connected to the wall surfaces 5B and 5B is configured as slopes 5Db and 5Db that descend toward the wall surfaces 5B and 5B with the opening 5Da as a vertex. 3. A windproof, moistureproof, dripproof and dustproof structure for an electronic balance according to claim 2 . A fixing member 5C extends from one wall surface 5A of the windshield member 5 toward the outside of the windshield member 5, and a screw 8 is formed in the measuring unit main body 1 through an insertion hole 5Ca of the fixing member 5C. 4. The windproof / moisture / drip-proof of the electronic balance according to any one of claims 1 to 3 , wherein the windshield member 5 is fixed to the measuring unit main body 1 by being screwed into the screw hole 1C. -Dust-proof structure. 5. The windproof / winding of the electronic scale according to claim 4, wherein the screw 8 for fixing the windshield member 5 is a screw that can be rotated manually, and the windshield member 5 can be attached and detached without using a tool. Moisture-proof, drip-proof and dust-proof structure.

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