JP2649922B2 - Processing fluid tank lock device - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a machining liquid tank lock device for preventing a careless opening of a panel in a panel opening / closing type working liquid tank used for an electric discharge machine or the like.

2. Description of the Related Art When performing high-energy machining such as rough machining in an electric discharge machine, a machining fluid tank is provided around a work, an electrode, a bed, etc. in order to cool a heating unit and to recover insulation between electrodes. It is well known that a panel to be formed is mounted and filled with a working fluid, and electric discharge machining is performed in the working fluid. This panel 1
Is mounted so as to cover a work, an electrode, a bed and the like on all sides as shown in FIG.

By the way, when performing the electric discharge machining in the machining fluid in this way, in exchanging the work, in order to perform a precise positioning, the drain 5 provided in the oil pan 4 of the electric discharge machine 3 which forms the bottom of the machining fluid tank 2. After the processing liquid is completely discharged and the processing liquid tank 2 is emptied, a part 1a of the panel which can be opened and closed by a hinge or the like 6 is opened, and the processing liquid or processing powder remaining on the bed is removed. Must be removed and a new work set on the bed again. Also, in the case of the die-sinking electric discharge machine, when the Z-axis is positioned at the time of replacement of the consumable electrode, the machining fluid is discharged from the machining fluid tank by the above procedure every time the electrode is replaced, and the reference of the workpiece is obtained. It becomes necessary to reposition the electrodes with respect to the surface.

Then, re-attach the opened panel 1a again,
Although the working fluid tank 2 is filled with working fluid, in order to facilitate such panel attaching / detaching work, the fixture 7 for engaging the panel is a buckle type using a fulcrum spring or the like. Many. Such a buckle-type fixing tool 7 is excellent in operability and convenient. On the other hand, if the working fluid is inadvertently operated while the working fluid remains in the working fluid tank 2, a large amount of working fluid is immediately generated. It has the drawback of spillage.

Also, when such an accident occurs, the machining fluid used in electric discharge machining is generally a mineral oil mainly composed of paraffinic hydrocarbons, and its flash point is relatively low at around 65 ° C to 130 ° C. Inadvertently spilled machining fluid may cause a fire.

Problems to be Solved by the Invention Therefore, an object of the present invention is to provide a working fluid tank lock device that prevents an inadvertent opening of a panel opening / closing working fluid tank.

Means for solving the problem The present invention is a float that detects and displaces the liquid level,
The above problem is solved by providing a lock mechanism that prevents the operation of the fixture in conjunction with the displacement of the float.

Operation The float is displaced by detecting the amount of the working fluid in the working fluid tank, that is, the liquid level. The lock mechanism operates in conjunction with the displacement of the float, and when a processing liquid is present in the processing liquid tank, prevents the operation of the fixture that fixes the panel, thereby preventing the panel from being opened carelessly.

Example Hereinafter, an example of the present invention will be described.

In FIG. 2, a buckle type fixing tool 7 is a well-known type using a spring beyond a fulcrum, which engages an opening / closing panel 1a forming a working liquid tank with another fixing panel 1. The spring beyond the fulcrum here uses a wire connecting the lever 8 of the fixture 7 and the stopper 9, that is, the elasticity of the binding 10, and the fixing position of the binding 10 at the stopper 9 and the lever 8. The rotary shaft 11 and the offset d amount d act as a spring beyond the fulcrum. A plurality of fixtures 7 having the same configuration are used, and the opening and closing panel 1a and the fixed panel 1 are securely fixed as shown in FIG.

In FIG. 1, which shows the arrow AA in FIG. 2, reference numeral 12 denotes upper and lower rod guides fixed to the inner side surface of the opening / closing panel 1a. The rod guide 12 has a cross section BB. ,
It is formed as shown in FIG.
The sliding rod 13 is loosely fitted in a vertically slidable manner. The sliding rod 13 has a pipe structure with reduced weight, a float 14 is attached to the lower end, and the upper end is rotatably connected to a long hole 16 provided at one end of a stopper 15 via a pin 17. Have been. The stopper 15 is rotatably supported by a mounting member 19 fixed to the upper surface of the open / close panel 1a via a pin 18 and has an L-shaped engaging portion 15a at the other end. As shown in FIG. 7, the fixing tool 7 faces the front surface of the lever 8, that is, the side to which the lever moves when the manual release operation is performed. Stopper 1 with float 14 and engaging portion 15a
The sliding rod 13 for mechanically transmitting the displacement of the float 5 and the float 14 to the stopper 15 constitutes a lock mechanism for the fixture 7.

Reference numeral 4 denotes an oil pan of the electric discharge machine constituting the bottom of the machining liquid tank, and reference numeral 20 denotes packing.

 Next, the operation of this embodiment will be described.

First, a processing liquid is present in a processing liquid tank constituted by the fixed panel 1, the opening / closing panel 1a, the oil pan 4, and the like, and the level of the processing liquid is constant, that is, in FIG.
When the height has reached the height h corresponding to the depth of the concave portion, the float 14 detects this liquid level and generates buoyancy, and is displaced upward to slide the sliding rod 13 upward. The rod 13 that has slid upward rotates the stopper 15 clockwise via the pin 17 and pushes the L-shaped engaging portion 15a of the stopper 15 into the third position.
As shown in the figure, since the lever 8 is engaged with the front surface of the lever 8, the lever 8 cannot be operated in the release direction in this state. Therefore, the opening and closing panel 2a is not accidentally opened.

On the other hand, when the processing liquid does not exist in the processing liquid tank, or when the liquid level does not reach a certain amount, that is, the height h corresponding to the depth of the concave portion of the oil pan 4 in FIG. Means that the float 14 does not detect the liquid level, and in this state, the stopper 15 rotates counterclockwise, as is apparent from the balance of the moment around the pin 18.
Since the L-shaped engaging portion 15a of the stopper 15 is moved to the position shown by the two-dot chain line in FIG. 1, the engagement between the lever 8 and the engaging portion 15a is released, and the lever 8 is operated in the release direction. Thus, the opening and closing panel 2a can be opened. However, in this state, even if the open / close panel 2a is opened, the working liquid does not flow out because the liquid level is less than the depth of the concave portion of the oil pan 4.

If the type of machining fluid to be used for electric discharge machining cannot be specified in advance, an extendable adjuster is provided at the intermediate portion of the sliding rod 13 so that the liquid level of the float 14 caused by the difference in the specific gravity of the machining fluid is provided. Should be adjusted.

In addition, if the float 14 and the sliding rod 13 and the stopper 15 and the mounting member 19 are configured to be detachable, it is possible to remove these equipments that are troublesome for a skilled worker from the panel 1a.

As an example, the case of using an L-shaped engaging portion and a buckle-type fixing tool has been described, but the fixing tool may be any as long as the operation in the releasing direction can be prevented by a lock configuration interlocked with the displacement of the float.

According to the present invention, it is possible to prevent the panel opening / closing type working liquid tank from being inadvertently opened.

[Brief description of the drawings]

FIG. 1 is a vertical sectional view of an essential part taken along line AA of FIG. 2,
2 is a plan view, FIG. 3 is a side view, and FIG.
FIG. 5 is a view showing a part of a cross section taken along line -B, and FIG. 5 is a perspective view showing an example of the prior art. DESCRIPTION OF SYMBOLS 1 ... Fixed panel, 1a ... Opening and closing panel, 2 ... Machining fluid tank, 3 ... Electric discharge machine, 4 ... Oil pan, 5 ... Drain, 6 ... Hinge, 7 ... Buckle type fixing tool, 8 ...
Lever, 9 ... Stopper, 10 ... Binding, 11 ...
Rotating shaft, 12 Rod guide, 12a Bending part, 13
Slide rod, 14 Float, 15 Stopper, 16
... Elongated hole, 17,18 ... Pin, 19 ... Mounting member, 20 ... Packing.

Claims (1)

(57) [Claims] 1. A panel opening / closing type working liquid tank having a fixture for fixing an opening / closing panel, a float which detects a liquid level and is displaced, a sliding rod for transmitting the displacement of the float, and an upper edge of the panel. Equipped with a stopper rotatably mounted with a pin at the center, one end of the stopper is connected to one end of the sliding rod, and the other end of the stopper is provided with an engagement portion for preventing manual release operation of the fixing tool. A working liquid tank lock device, characterized in that it is used as a lock mechanism for the open / close panel.