JP2816776B2 - Ceiling installation method of fan filter unit - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a clean room in which a HEPA filter is stretched over a ceiling to blow clean air from the ceiling, and a HEPA filter is attached to a lower opening of a casing containing a fan. FFU that ensures workability, safety and accuracy when constructing the ceiling using fan filter units (called FFU)
Related to the installation construction method.

[0002]

2. Description of the Related Art It is known to form a ceiling of a clean room by mounting a large number of FFUs on a frame extending over the ceiling. For example, Japanese Patent Application Laid-Open No. 61-72947 by the same applicant discloses an invention in which a clean room is constructed using such an FFU.

In this case, a rectangular FFU is generally mounted on a ceiling frame having a rectangular frame with the filter surface facing downward. It is a difficult task to accurately and accurately mount the filter on a ceiling at a high place without damaging the filter. Lifting the FFU alone is not enough, and about four people, including workers on the ceiling with only a frame with poor scaffolding, are forced to work together to install one FFU.

[0004]

SUMMARY OF THE INVENTION An object of the present invention is to make it possible to safely and accurately perform the ceiling installation work of the FFU constituting such a clean room ceiling surface only by workers on the floor surface. is there.

[0005]

According to the present invention, when an FFU is installed on a frame stretched over a ceiling of a clean room, a table having an area slightly smaller than an opening area of a frame for installing the FFU can be expanded and contracted. Using a lifting machine supported swingably at the tip of the rod, place the FFU on the table with the filter face down, and set the FFU anti-slip fitting on one side edge of the table. The table is tilted so that the side edges are downward, and the FFU and the table are lifted above the frame while maintaining the tilted state so as to pass through the opening of the frame. Return the table to the horizontal position, lower the table to the position where the FFU is placed in the frame, and further remove only the table while leaving the FFU in the frame. Providing ceiling mounting construction methods of fan filter units, characterized in that cause later.

[0006]

FIG. 1 shows an example of a lifting machine used in the present invention. This hoist comprises a main body 1 placed on the floor, a lift section consisting of a telescopic rod 2 extending vertically from the main body 1, and a table 3 attached to the tip of the rod 2 so as to swing freely. ing.

The main body 1 is portablely placed on the floor by casters 5. The main body 1 has an operation section 6 for performing a lift operation and a slide bed for finely sliding the rod 2 horizontally in a vertical state. 7 and a turntable 8 for rotating the rod 2 around its axis.
The whole has a weight enough to withstand the lifting work. The operation unit 6 for performing the extension / retraction operation of the rod 2 includes a drive motor, and the lift operation is performed electrically. The slide bed 7 is slidably supported in the lateral direction with respect to the turntable 8, and moves relative to each other by operating the operation handle 9. As a result, the rod 2 slides a slight distance in the horizontal direction while maintaining the vertical state. The turntable 8 is rotated around the axis with respect to the base 11 by operating the operation handle 10.

A rectangular table 3 is attached to the top end of the telescopic rod 2 so as to be swingable. In the example shown in the figure, a support rod 12 is fixed at the center of the bottom of the table. The tip of the rod 2 is connected via a knuckle joint 13. The knuckle joint 13 allows the table 3 to swing freely in one plane passing through the rod axis with respect to the vertical rod 2, but when the table 3 is in the horizontal position, the table 3 has a predetermined inclination angle (45 degrees in the embodiment). In the case of (2), stoppers that stop at two positions are provided.

A non-slip fitting 14 is attached to the lower edge of the table 3 when the table 3 is inclined.
A wire 15 is suspended from the bottom near the upper edge. The non-slip metal fitting 14 is for preventing the FFU 16 from falling even when the FFU 16 is placed on the table 3 and tilted, and can be detachably set on the table 3. FIG. 1 shows a state where the table 3 is at a fixed position inclined at 45 degrees. Even if a load is received at the center of the table 3 by the support rod 12, the load of the anti-slip fitting 14 attached to one edge shifts the position of the center of gravity toward the edge as a result. Tilt to a fixed position. To return the table 3 to the horizontal position from the 45-degree inclined position, the wire 15 may be pulled.

FIGS. 2 and 3 show a state where the table 3 on which the FFU 16 is mounted is in a 45-degree inclined position (FIG. 2) and a horizontal position (FIG. 3). Anti-slip fitting 14 is FFU in the inclined position
16 is stopped, and the metal fitting 14 is removed at the horizontal position. The reason for this removal will be described later.

As seen in FIGS. 2-3, FFU 16 is
A fan 19 and a fan motor 20 are mounted in a rectangular casing 18, and an air suction port 21 is provided at an upper portion of the casing 19, and an opening is provided below the casing 19. The filter unit 22 is detachably set in the lower opening. The filter unit 22 has a structure in which a filter frame is attached to the periphery of a rectangular HEPA filter layer. Therefore, FFU
16 has a HEPA filter exposed on the lower surface when placed in a horizontal position.

Since the entire load of the FFU 16 is about 40 kg, the surface of the HEPA filter is exposed on the lower surface. If the entire load is supported on this surface, the HEPA filter may be damaged. It was found that the HEPA filter was not damaged if the entire surface of the HEPA filter was put on the soft material layer 23 by covering the soft material layer 23 such as foamed urethane resin on the surface, and the entire FFU was loaded.

The area of the table 3 and the surface of the soft material layer 23 are made slightly smaller than the area of the filter unit 21.
This is because only the table 3 can be lowered through the frame after the FFU is placed on the ceiling frame. The details will be described in the construction procedure described below.

FIG. 4 shows a stage in which the FFU 16 is pushed upward to the frame 25 on the ceiling in an inclined state. The frame 25 is formed by assembling a crossbar in a direction perpendicular to the paper surface and a crossbar in a parallel direction like a grid.
Has an opening area in which a can be placed. Therefore, FF
When U16 is horizontal, the FFU 16 cannot pass through the frame 25. By lifting and tilting as shown in FIG. 4, the entire FFU 16 can be lifted up to above the frame 25 through the frame 25.

FIG. 5 shows a stage in which the FFU 16 lifted up to above the frame 25 is leveled. this is,
This is performed by pulling the rope 15. Then, the anti-slip fitting 14 attached in the inclined state is removed. This detaching operation can be performed from the indoor side using a stepladder or the like, even if there is no worker above the frame 25.

FIG. 6 shows a stage in which only the FFU 16 is placed on the frame 25 and the table 3 is passed through the frame 25 downward while keeping the table 3 horizontal. In this case, FFU
In order to place 16 correctly on the predetermined position of the frame 25,
It is necessary to finely adjust and rotate the FFU 16 in the horizontal direction. This is performed by operating the slide bed 7 and the turntable 8 of the hoist. Also,
Attachment of a spacer and the like are performed at this installation stage as necessary. This operation can also be performed from the indoor side using a stepladder or the like. With this, the installation work is completed, and the operation moves to the next frame 25.

In performing the above-mentioned operations, the positioning of the lifting machine on the floor is an important factor. This is performed by suspending the weight thread from the diagonal corners of the frame 25 using appropriate stoppers. It is convenient to carry out lowering, marking on the floor, and setting the hoist precisely at the marking position. At that time, the positioning is finely adjusted by operating the slide bed or the turntable. After moving the lifting machine to the installation position, use the stopper to
Is stopped at that position. In order to prevent damage to the clean room floor, a series of work is performed with the curing board laid on the floor.

[0018]

According to the present invention, a fan filter unit having a weight of about 40 kg can be installed by a robot operation on a frame having an opening slightly smaller than the installation area of the unit. For this reason, it is not necessary for the worker to climb to the ceiling using the ceiling scaffolding, and the work can be performed only by working from the floor surface, so that the worker is safe and the installation accuracy is good. Also, the number of required workers is halved compared to the conventional method. Actually, only two people are needed to place the FFU on the table, but other tasks can be performed by one person. In addition, the cause of contamination of the clean room is eliminated compared to manual work in which a scaffold is created on the ceiling and workers work in the ceiling, and this effect is not only required for new installation of FFU but also for maintenance. (Replacement due to clogging of filter, etc.).

[Brief description of the drawings]

FIG. 1 is an overall view showing an example of a hoist for performing an FFU installation operation of the present invention.

FIG. 2 is a side view showing a state where the FFU is placed on a table in an inclined state.

FIG. 3 is a side view showing a state where the FFU is placed on a table in a horizontal state.

FIG. 4 is a side view showing one stage of the work of the present invention and showing a state in which the FFU is lifted in an inclined state.

FIG. 5 is a side view showing one stage of the work of the present invention and showing a state in which the FFU is horizontal at a position above the frame.

FIG. 6 is a side view showing one stage of the work of the present invention, showing a state where the FFU is placed on the frame and only the table is lowered.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Lifting machine 2 Telescopic rod 3 Table 5 Caster 6 Operating part which performs lift operation 7 Slide bed 8 Turntable 11 Base 12 Table support rod 13 Knuckle joint 14 Non-slip fitting 15 Rope 16 FFU (Fan filter unit) 19 Fan 20 Fan Motor 22 HEPA filter unit 25 Ceiling frame

Claims (4)

(57) [Claims] When a fan filter unit (FFU) is installed on a frame stretched over a ceiling of a clean room, a table having an area slightly smaller than an opening area of a frame for installing the FFU is attached to a tip of an extendable rod by a neck. Using a lifting machine supported swingably,
Place the FFU on the table with the filter side down, set the FFU anti-slip fitting on one side edge of the table, and incline the table so that the side edge is down. Lift the frame above the frame while maintaining the inclined state so as to pass through the opening of the frame, return the table to a horizontal position above the frame, and move the table to the position where the FFU is placed on the frame. And lowering only the table while leaving the FFU in the frame. A ceiling filter installation method for a fan filter unit. 2. The method according to claim 1, wherein the rod of the hoist is rotatable around an axis. 3. The construction method according to claim 1, wherein the non-slip fitting is detachably set on the table 3, and is removed from the table when the table is returned to a horizontal position at a position above the frame. 4. A main body placed on the floor, a lift comprising a telescopic rod extending vertically from the main body,
An operating section, which comprises a table attached to the tip of the rod to be able to swing freely, wherein the main body performs a lift operation;
An FFU hoist comprising a slide bed for finely adjusting and sliding a rod in a horizontal direction while a rod is in a vertical state, and a turntable 8 for rotating the rod about an axis.