JPH0333423Y2 - - Google Patents

Description

[Detailed explanation of the invention] [Purpose of the invention] (Field of industrial use) This invention is a table cover for a grinding machine, specifically a table for a rotary table grinding machine that makes it easier to observe the grinding situation safely and reliably. Regarding the cover.

(Prior Art) A table cover for a rotary table grinder is constructed by attaching a transparent plastic sheet molded body such as acrylic resin to the window portion of a frame body with a window. Then, it slides around a part of the outer periphery of the table to open and close this area. Most of the table covers have a cylindrical shape with a cutout of 1/3 to 1/4 circumference to have such an opening/closing function. In some cases, the above-mentioned cover is combined with a shorter flat hinged single-opening cover as an auxiliary cover. This facilitates the loading and unloading of particularly large workpieces on the rotary table inside the cover.

(Problems to be Solved by the Invention) However, with the table cover having the above structure, it is often difficult to observe the internal grinding situation in detail. This is because when looking inside a transparent plastic sheet, reflections on the surface of the sheet, dirt on the sheet, adhesion of grinding fluid, etc., and deterioration of transparency due to scratches and discoloration on the sheet surface. Generally, internal observation through a plastic sheet is
The clarity is often much lower than direct observation without a plastic sheet.

For this reason, for example, it is a safety problem to open the cover a little and observe the inside from there. In other words, the vicinity of the lower part of the grinding wheel rotating at high speed and the rotating workpiece on the rotary table are viewed in an exposed state, albeit from a limited field of view.
Therefore, these rotating bodies are left defenseless in the unlikely event of damage, which is extremely dangerous. Furthermore, the window portion equipped with only a transparent plastic sheet is insufficient in strength against the above-mentioned emergency situation. That is, in the above-mentioned situation, there is a risk that the plastic sheet may be damaged, leading to a secondary disaster.

Sometimes, if for some reason the cover is opened wide by mistake, both the grinding wheel and the broken workpiece continue to rotate at high speed, and there is a possibility that the grinding wheel and the broken workpiece may be touched, making the risk even higher.

This invention was devised in view of the above-mentioned conventional problems, and aims to provide a table cover for a rotary table grinding machine that improves the safety of the cover itself and allows direct and safe internal observation.

[Structure of the invention] (Means for solving the problem) In order to achieve the above object of this invention, a rotary table grinding machine has an arc-shaped fixed cover on the outer periphery of the rotary table and a space apart from the fixed cover. An auxiliary cover is provided at the position where the auxiliary cover is located, a first cover in the shape of an arc that is slidable on the fixed cover is attached, and the first cover has an arc-shaped first cover that protrudes toward the auxiliary cover and is provided with a peep part. A table cover of a rotary table grinder is configured by attaching a second cover and providing a detection sensor for detecting a state in which the second cover is closed to the auxiliary cover to a state in which the first cover is closed to the auxiliary cover. did.

(Function) By adopting this invention, the state from the state in which the second cover is closed to the auxiliary cover to the state in which the first cover is closed to the auxiliary cover is detected, for example, by a detection sensor provided inside the auxiliary cover, While in the above state, the rotary table and grinding wheel are rotated. Furthermore, when the second cover is closed to the auxiliary cover, the interior can be observed safely through the viewing section provided on the second cover.

When the second cover is opened from the auxiliary cover, the grinding machine is stopped.

(Example) Hereinafter, an example of this invention will be described in detail based on the drawings.

Referring to FIG. 1, a grinding wheel head 5 is disposed above a main body 3 of a rotary table grinding machine 1 so as to be horizontally slidable back and forth. The grinding wheel 7 attached to the tip of a horizontal shaft (not shown) is surrounded by a cover 9 except for the vicinity of its lower end. The horizontal shaft (not shown) is driven by a motor 11 and rotates at high speed. A rotary table 13 is disposed horizontally below the grinding wheel 7, and is driven and rotated via a drive motor, a transmission mechanism, a vertical shaft, etc. (not shown).

The grinding wheel head 5 is also raised and lowered by a set amount by a lifting mechanism (not shown). A workpiece (not shown) is accurately placed and fixed on the rotary table 13 via an electromagnetic chuck (not shown), and grinding is performed. Each operation of the grinding process is controlled manually by the control panel 15 or by value control.

The upper part of the periphery of the rotary table 13 is surrounded by a fixed cover 17 having a combination of an arcuate wall part and an upright flat wall part, as shown in the upper area of FIG. The lower left area in FIG. 2 following this fixed cover 17 is the table cover 19 that is subject to constant opening and closing operations in this case. In other words, the table cover 19 is approximately 1/3 to 1/3 of the outer circumference of the rotary table 13.
The range of 1/4 circumference is the guide rail 2 near the outer circumference.
Can be opened and closed by sliding on the top.

In this case, when the table cover 19 is slid toward the open side, it is stored in a stacked state on the inner circumference side of the fixed cover 17 on the outer circumference of the rotary table 13 as shown in FIGS. 1 and 8. The front side (lower side in Fig. 2) of this table cover 19 when it is closed.
A semi-fixed short flat arc-shaped auxiliary cover 2
3 are installed. The auxiliary cover 23 has a hinge 25
It is attached through the pipe and is normally closed. When loading or unloading a large workpiece or attaching/detaching it to/from the rotary table 13, the operator can open it by grasping the handle 23T and horizontally rotating it toward the arrow A side in FIG. 2.

The table cover 19 includes a frame body 27 with a window as a first cover which is bent into an arc shape as shown in FIG.
A transparent sheet molded body 29 such as an acrylic plate and a metal perforated plate-shaped molded body 31 serving as a second cover are laminated. The window frame body 27 is made of a steel plate, and a transparent sheet molded body 29 made of acrylic resin and bent into an arc shape having the same curvature is disposed in the window portion 33 thereof. Furthermore, a metal perforated plate-shaped molded body 31 bent into an arc shape with the same curvature is superimposed on the inner circumferential surface thereof, and these three are fastened together with screws.

The hole 35 serving as the viewing portion of the metal perforated plate-shaped molded body 31 has a vertically elongated rectangular shape as shown in FIG. There is. This metal perforated plate-shaped molded body 31 is an opening/closing operation part 39 of the window frame 27.
It is made to extend outward and forward from the vertical side edge 41 close to. That is, the handle 4 for opening and closing the window frame 27
In this case, as shown in FIG. 3, it protrudes by, for example, about 130 mm from the vertical side edge 41 on the side where 3 is attached.
Ribs 47 are attached to the inner peripheral surface of this protrusion 45 at the top and bottom.

The auxiliary cover 23 also has a small window 49 as shown in FIG.
A transparent sheet 51 made of acrylic resin and a perforated plate-shaped molded body 53 made of steel plate are laminated and fastened with screws. Furthermore, a small case 55 is provided at the upper part of the inner circumferential side, and a proximity switch 57 as a detection sensor is disposed within the small case 55. This proximity switch 57 operates by detecting that the protruding portion 45 of the metal perforated plate-shaped molded body 31 on the table cover 19 side is passing through the rib 47.

This proximity switch 57 is combined with a relay (not shown) to turn on/off the drive power circuit of the grinding machine 1. That is, the closing operation of the table cover 19 is interlocked with the rotation of the table of the grinding machine 1 and the rotation of the grindstone. Unless the table cover 19 is closed, the table and the grindstone cannot be rotated. Also, during the above rotation (during grinding), the table cover 19
If it opens, it will cause an emergency stop and the machine's hydraulic circuit will shut down.
OFF, and everything except the electromagnetic chuck is turned off. Specifically, the proximity switch 57 is activated when the tip of the rib 47 of the protrusion 45 of the perforated metal plate-shaped molded body 31 of the table cover 19 reaches directly below the proximity switch 57. and table cover 1
9 is completely closed, the operation of the proximity switch 57 continues.

That is, the power circuit of the grinding machine 1 is turned on under the condition that the vertical edge 41 of the table cover 19 on the opening/closing handle 43 side approaches the auxiliary cover 23 within, for example, about 100 mm as shown in FIG. If the distance between the two becomes, for example, about 100 mm or more, the power circuit of the grinding machine 1 is turned off and the grinding machine 1 stops. It should be noted that when only the table cover 19 is opened to the maximum extent, it becomes as shown in FIG. 8, and the opening width in this case is, for example, about 460 mm.

This table cover 19 configured as above
works like this: That is, first of all, any damage to the acrylic resin transparent sheet molded body 29 of the window portion 33 of the window frame 27 can be strongly prevented, and safety is greatly improved. This is because the metal perforated plate-shaped molded body 31 is laminated on the inner periphery. If the internal grinding wheel 7 or the rotary table 13
Even if the upper workpiece breaks and scatters, the chance of directly breaking through the transparent sheet molded body 29 is greatly reduced.

Then, as shown in FIG. 7, the table cover 19 is slightly opened, for example, within 100 mm from the auxiliary cover 23, so that the situation during grinding can be observed safely and clearly. That is, the metal perforated plate-shaped molded body 31
It is safe because the inside can be observed by passing through the hole 35 of the protrusion. Furthermore, since the observation is performed without using the transparent sheet molded body 29, it can be seen much more clearly.

Furthermore, in the event that the table cover 19 is opened wide by mistake, for example to an opening width of approximately 100 mm or more, the proximity switch 57 is activated to close the grinding machine 1.
The drive power supply circuit is turned off. Therefore, since the grinding machine 1 immediately stops, the risk of contact with the grinding wheel 7, the rotary table 13, and the workpiece that are rotating at high speed as in the conventional case is greatly reduced. In other words, even in such cases, the risk of secondary disasters is greatly reduced, and safety is greatly improved.

This invention is not limited to the one embodiment described above, and various modifications are possible. For example, the sliding opening/closing type table cover may be hinged at the left vertical edge in FIG. 2 so that it can be opened by horizontally rotating toward the front in the drawing. In this case as well, it is easy to protrude the perforated metal plate-like molded body on the right side as shown in FIG. 2 and operate the proximity relay on the auxiliary cover side as described above. Alternatively, the perforated metal plate-like molded body may be a coarse wire mesh having a large wire diameter.

[Effects of the invention] As is clear from the above explanation, the table cover of the rotary table grinder of this invention has the following effects:
The safety of the cover part and when opening/closing the cover is improved. Additionally, the situation of the grinding section can be observed clearly and safely.

[Brief explanation of the drawing]

Fig. 1 is a perspective view of a rotary table grinder using an embodiment of this invention, Fig. 2 is a perspective view of a table cover which is the main part of Fig. 1, and Fig. 3 is a perspective view of a rotary table grinder using an embodiment of this invention.
Figure 4 is a plan view of some of the holes in the metal perforated plate molded body, which is one of the components, and Figure 5 is an exploded diagram of the auxiliary cover, which is another main part. , FIG. 6 is a front perspective view of FIG. 5, FIG. 7 is a perspective view of the cover in FIG. 2 in the middle of being closed, and FIG. 8 is a perspective view of the cover in the open state. DESCRIPTION OF SYMBOLS 1... Rotary table grinder, 13... Rotary table, 19... Table cover, 27... Window frame, 29... Transparent sheet molded body, 31... Metal perforated plate-shaped molded body, 39... Opening/closing operation part, 41...
Vertical side edge near the opening/closing operation section, 45...Protrusion.

Claims (1)

[Scope of utility model registration request] An arc-shaped fixed cover is provided on the outer periphery of the rotary table of a rotary table grinding machine, and an auxiliary cover is provided at a distance from the fixed cover, and an arc-shaped first cover that is slidable with respect to the fixed cover is attached. A second cover, which protrudes toward the auxiliary cover and has a viewing portion, is attached to the first cover, and when the second cover is closed to the auxiliary cover, the first cover is closed to the auxiliary cover. A table cover for a rotary table grinding machine, characterized in that it is equipped with a detection sensor that detects up to the state of the grinder.