JP2020051672A - Local exhaust device - Google Patents

Abstract

To provide a local exhaust device which may can provide an environment that meets a specified control wind speed and which may measure paint with an extremely high accuracy.SOLUTION: A space above a work table 2 and a weighing table 3 is surrounded by an enclosure hood 4. The enclosure hood 4 has a work opening 4g on the front side of the work table 2. The front wall 4 f of the weighing table 3 is formed of a transparent panel that provide seen through view. A fan for generating an air flow is provided in a machine room 5 below the work table 2. A baffle plate 9 closes a part of the space between the work table 2 and the weighing table 3. As to the space above the work table 2 and the space above the weighing table 3 surrounded by the enclosure hood 4, a section higher than an upper edge 9a of the baffle plate 9 is mutually communicated and a section lower than the upper edge 9a is not communicated. The work table 2 is composed of a plate material that allows air to pass through in the vertical direction. The space below the upper edge 9a of the baffle plate 9 on the side of the weighing table 3 forms a dead end for the wind.SELECTED DRAWING: Figure 1

Description

The present invention relates to a bench type local exhaust device corresponding to a compounding operation using an organic solvent, and in particular, a local exhaust device improved in safety by enclosure type exhaust without impairing the workability of the organic solvent compounding operation by hand toning. About.

In the blending operation, a target paint is prepared by appropriately blending three primary colors of red, yellow, and blue, and white and black paints. It is known that paints such as black and red have a very large influence on the color of paint as a product to be finally prepared, even if the error is small. Therefore, in such a paint blending operation, when blending a paint in which a slight error greatly affects the color of the final product, it is necessary to carry out the blending after precise measurement. This weighing is performed manually by a paint mixing operation.

JP-A-4-71133 JP-A-11-80625

In most cases, paint preparation operations correspond to organic solvent operations. The Ordinance on Prevention of Organic Solvent Poisoning (Article 2 and Paragraph 1) stipulates the use of a certain amount of organic solvent as the organic solvent work, and the use of a local exhaust system is mandatory. According to the Ordinance on Prevention of Organic Solvent Poisoning, Chapter 3, Article 16, the local exhaust system should have a controlled wind speed of 0.4 m / s when using a local exhaust system with an enclosed hood, for example. It is stipulated that, in the case of a local exhaust device of a mounting hood, for example, a downward suction type device must have a capability of generating a control wind speed of 0.5 m / sec.

As mentioned above, even if the error is slight, it is necessary to accurately measure the weight of the paint which has a very large effect on the color of the paint as the final product to be prepared by a measuring device. . Since such a measurement operation also corresponds to the organic solvent operation, the measurement operation must be performed in an environment where an airflow at a controlled wind speed exists. However, the measurement by the measuring instrument is extremely delicate, and there has been a problem that the airflow at a predetermined control wind speed affects the measurement.

Therefore, an object of the present invention is to provide an environment that satisfies a predetermined control wind speed, and to provide a local exhaust device that can measure paint very accurately.

The present invention relates to a local exhaust device for performing local ventilation,
A work table and a weighing table are arranged adjacent to the front of the local exhaust device,
An enclosure hood that surrounds a space above the work table and the weighing table, the work hood has a work opening on a front side of the work table, and a front wall of the weigh table is configured by a transparent panel that can be seen through,
A fan that generates an air flow is provided in a machine room below the work table,
A baffle for closing a part of a space between the work table and the weighing table, wherein a space on the work table and a space on the weighing table surrounded by the enclosed hood are positioned above an upper edge of the baffle plate. Are communicated with each other, communication is blocked below the upper edge,
The work table is formed of a plate material that allows air to pass therethrough vertically, and a space below an upper edge of the baffle plate on the weighing table side constitutes a dead end path for wind.

According to the present invention, below the upper edge of the baffle plate, the air flow by the fan is suppressed by the baffle plate, so that the influence of the air flow in the weighing device is suppressed. Further, since the arm of the worker is inserted on the weighing table via the work table, there is an effect that the worker is not exposed to the organic solvent.

1A shows an operating state, and FIG. 1B shows a state when setting a measuring device. FIG. 2A is a diagram for explaining the operation of the local exhaust device, FIG. 2A is a front view, and FIGS. 2B and 2C are cross-sectional views.

Hereinafter, the present invention will be described in detail based on examples.
In FIG. 1A, a local exhaust device 1 is a device for performing local ventilation in order to prevent exposure when a worker handles an organic solvent. The local exhaust device 1 is provided with a work table 2 made of a plate material such as punching metal that passes air up and down, and at the same or similar height position as the work table 2 and is arranged next to the work table 2. It has a weighing table 3 to be measured. The weighing table 3 is made of a plate material without holes, and air cannot pass up and down. The work table 2 and the weighing table 3 are arranged adjacent to the front of the local exhaust device 1. The handling of the organic solvent and the like is performed on the work table 2. On the weighing table 3, a weighing device is placed.

The space above the work table 2 and the weighing table 3 is surrounded by an enclosed hood 4 having a rear wall 4a, a left wall 4c (as viewed in the drawing), a right wall 4b, a ceiling 4d, and front walls 4e and 4f. ing. As can be easily understood from the drawing, the enclosing hood 4 has an appropriate frame formed in a cube shape and supports the rear wall 4a, the left wall 4c, the right wall 4b, the ceiling 4d, and the front walls 4e and 4f as supporting frames. This is the configuration. The front wall 4e is continuous with the ceiling 4d and closes the upper front of the space on the work table 2 and the weighing table 3. The front wall 4f is continuous with the front wall 4e and closes the lower front of the space on the weighing table 3.

In the lower front side of the space on the work table 2, a work opening 4g is largely opened so that an operator can insert his / her hand from the front side of the local exhaust device 1 to work. A transparent panel is used for the front wall 4f so that an operator working in front of the local exhaust device 1 can visually recognize the weighing device 8 on the weighing table 3. If all the walls of the enclosed hood 4 or all the walls other than the rear wall are made of transparent panels, the visibility is further improved.

The local exhaust device 1 is a pull-type exhaust device that sucks air on the work table 2 through the work table 2. Outside air is taken in from the work opening 4g and is sucked into the work table 2 as shown by the arrow a. A baffle plate 9 that blocks a part of the space between the work table 2 and the weighing table 3 is provided. The space above the work table 2 and the space above the weighing table 3 surrounded by the surrounding hood 4 communicate with each other above the upper edge 9a of the baffle plate 9, but communicate with each other below the upper edge 9a. Only nine locations are blocked from communicating. As a result, the space on the weighing table 3 side located below the upper edge 9a of the baffle plate 9 constitutes a bladder of air, and the air sucked in from the working opening 4g causes the measuring position of the weighing device 8 (affecting the weighing). Sensor part).

A machine room 5 for storing a fan 10 (FIG. 2) for generating an air flow is provided below the work table 2, and the maintenance of the fan 10 can be performed by opening a door 6 at the front of the local exhaust device 1. It has become. On the right side of the machine room 5, a duct 7 for discharging air blown from the fan 10 is provided. The duct 7 is connected to a duct connected to an exhaust port provided outdoors (not shown).

FIG. 1B shows a state where the transparent panel of the front wall 4f of the weighing table 3 is removed and the weighing device 8 is installed. The front wall 4f can be removed from or attached to the enclosed hood by the fastener 11.

The operation of the local exhaust device 1 will be described with reference to FIG. FIG. 2A is a front view, showing a cutting location in the cross-sectional views of FIGS. 2B and 2C. FIG. 2B shows an X-X cross section of the local exhaust device 1 cut vertically on the work table side and looking at the fan. The interior of the machine room 5 is divided by a partition plate 5a into a path that is drawn into the fan via the work table 2 and a place where the fan is installed. The suction port of the fan is provided toward the rear side of the local exhaust device 1, and the air that has entered from the working opening in front of the local exhaust device 1 reaches the rear of the work table to the rear, and is evenly distributed. It is arranged to form an air flow.

FIG. 2C shows the local exhaust device 1 cut laterally on the work table 2 side and viewed from above. In the figure, the arms P and Q symbolically shown are the arms of the worker, and the state of the arm P on the work table is shown. The work opening 4g is used by the worker to insert the arm P on the work table 2. When using the weighing device 8 on the weighing table 3, the worker places the arm Q in the space on the weighing table 3 through the working opening 4 g and the space on the work table 2 and the upper edge 9 a of the baffle plate 9. Insert. Below the upper edge 9a of the baffle plate 9, the work table 2 stops the flow of air to the fan 10 on the machine room 5 side. Further, in the space above the weighing table 3, the influence of the airflow on the work table 2 by the fan 10 is suppressed by the baffle plate 9. Therefore, at the measurement position of the weighing device 8, the dead end space for the wind is a dead end space, and the influence of the air flow is suppressed. Further, since the arm Q is inserted on the weighing table 3 via the work table 2, the worker does not expose to the organic solvent. In addition, since the front wall 4f of the weighing table 3 is a transparent panel, there is an advantage that the weighing operation can be easily performed easily and visually.

In the above-described embodiment, the dead end for the wind is formed in the space below the upper edge 9a of the baffle plate 9. However, if ventilation of this place is necessary after the measurement work, ventilate it except for the measurement work. May be. For example, the weighing table 3 may be made up of a punched metal and a holeless plate, and the holeless plate may be removed except for the measurement work. Although the local exhaust device 1 of this embodiment is a pull-type exhaust device, a push-type fan may be attached to the ceiling 4d to be a push-pull local exhaust device. In this case, a rectifying plate extending from the ceiling 4d toward the upper edge 9a of the baffle plate 9 may be provided separately so that the airflow from the ceiling 4d does not flow toward the weighing table 3. In this case, a space is opened between the baffle plate 9 and the rectifier plate, and the worker places the arm Q on the work table 4 via the work opening 4g and the space above the work table 2 and between the baffle plate 9 and the rectifier plate. Insert into the space above. In the present embodiment, the right-handed specification is used. However, the left and right working tables 2 and the weighing table 3 may be exchanged to have a left-handed specification. In the above embodiment, the weighing table 3 is made of a plate having no holes, so that air cannot pass up and down. However, like the work table 2, another plate that does not allow air to pass through is used as a punch metal. It may be arranged on the side.

DESCRIPTION OF SYMBOLS 1 Local exhaust device 2 Work table 3 Weighing table 4 Surrounding hood 4a Rear wall 4b Right wall 4c Left wall 4d Ceiling 4e, 4f Front wall 4g Working opening 5 Machine room 5a Partition plate 6 Door 7 Duct 8 Measuring device 9 Baffle plate 9a Upper edge 10 Fan 11 Fastener

Claims (2)

In a local exhaust system that performs local ventilation,
A work table and a weighing table are arranged adjacent to the front of the local exhaust device,
An enclosure hood that surrounds a space above the work table and the weighing table, the work hood has a work opening on a front side of the work table, and a front wall of the weigh table is configured by a transparent panel that can be seen through,
A fan that generates an air flow is provided in a machine room below the work table,
A baffle for closing a part of a space between the work table and the weighing table, wherein a space on the work table and a space on the weighing table surrounded by the enclosed hood are positioned above an upper edge of the baffle plate. Are communicated with each other, communication is blocked below the upper edge,
The local exhaust device according to claim 1, wherein the work table is formed of a plate material that allows air to pass therethrough up and down, and a space below an upper edge of the baffle plate on the weighing table side constitutes a dead end path against wind.
2. The local exhaust device according to claim 1, wherein the surrounding hood includes transparent panels on left and right walls and a ceiling of the local exhaust device.