KR20020007467A - an air cutting off mechanism of a closed circuit for an automatic tool changer - Google Patents

Abstract

PURPOSE: Structure for preventing flow of air into a closed circuit of an automatic tool changer is provided to realize smooth clamping and unclamping action by blocking up the flow of air into a closed circuit when a tool is clamped and avoiding inflow with air to oil. CONSTITUTION: Air inflow preventing structure for a closed circuit of an automatic tool changer comprises first and second pistons(3,5) installed at both sides of oil in a cylinder(6); a spring(2) applying elasticity to the first piston; a packing(4) installed between the second piston and the cylinder to seal the oil; a clamp valve(7) supplying pneumatic pressure to operate the first piston; an unclamp valve(8) supplying pneumatic pressure to operate the second piston; an air blower valve(9) supplying pneumatic pressure to a main shaft; and a silencer(11) discharging the air from the cylinder when a tool is clamped. When clamping a tool, air flows in via the first clamp valve and the first piston is pushed rightward by the pneumatic pressure and the restorative force of the spring. Then, the air in the cylinder is discharged by the silencer, and the oil between the second piston and the first piston is prevented from being invaded with air.

Description

An air cutting off mechanism of a closed circuit for an automatic tool changer}

The present invention relates to an internal air inflow prevention structure of a closed circuit of an automatic tool changer. More specifically, the tool clamp prevents the inflow of air into the closed circuit and prevents air from seeping into the oil. An internal air inflow prevention structure of a closed circuit of an automatic tool changer for performing a clamping operation.

Machine tools used for the purpose of processing metals or non-metal materials into shapes and dimensions by means of various cutting or non-cutting methods or by using a suitable tool or for more precise machining on semi-materials are called machine tools. Among the machine tools described above, a machine tool in which chips are generated in a machining process is called a cutting machine tool, and a non-cut machine tool in which chips are not generated in a machining process is called a metal machine.

Thanks to the trend of overall industry growth, automation and numerical control (NC) in the cutting field are also rapidly progressing. In recent years, multi-functional machining centers have emerged due to the complex combination of numerical control (NC) of machine tools, which has been divided into rotary lathe series and milling series, and the market has been supported by the wide demand of industrial sites. It is expanding rapidly. The above-mentioned machining center is an NC machine tool which automatically performs several kinds of cutting operations in one machine, and is usually equipped with an automatic tool change function and a function of automatically cutting and dividing two or more surfaces of a workpiece. Machining centers can be divided into two types: machining non-rotating parts and machining rotating parts, regardless of where the roots of the development are located. Machining centers for non-rotating parts have been developed using the NC milling machine or NC drilling machine to be machined as a power generation matrix, including automatic tool changer (ATC), fouling magazine and automatic The machining center was created by combining the workpiece loader (AL). On the other hand, the machining center for rotating parts uses NC lathe as power generation matrix, and the rotating parts are processed in various ways such as angle division, grooving, hole machining, tapping, etc. It has an exchange device, and also holds the material with a separately prepared chuck during processing, and the finished workpiece is released from the chuck to automate the removal of the workpiece.

As described above, in general, an automatic tool changer is installed in the machining center. The internal closed circuit of the automatic tool changer is configured as shown in FIG. 1, and the operation is performed as follows.

When air is introduced through the unclamp valve 8 to push the second piston 5 to the left during tool unclamping, oil contained between the second piston 5 and the first piston 3 is first When the piston 3 is moved to the left and the first piston 3 is moved to the left in this way, the connector 1 and the spring 2 are operated by the operation of the piston 3 to unclamp the tool. Let's go.

In the tool clamp, air is introduced through the first clamp valve 7 to push the first piston 3 to the right, and the restoring force of the spring 2 also acts together. In addition, air is also introduced through the second clamp valve 10 to push the second piston 5 to the right.

However, in the closed circuit of the conventional automatic tool changer, the air introduced through the second clamp valve 10 at the time of the tool clamp is introduced into the second piston 5 through the packing 4 and the piston 5. By immersing into the oil contained between the and the first piston (3) there is a problem that the tool unclamp operation is not made correctly, the parts are broken.

An object of the present invention is to solve such a conventional problem, an automatic tool for smooth clamping operation and unclamping operation by blocking the inflow of air into the closed circuit during the tool clamping to prevent air from seeping into oil. An internal air inflow prevention structure of a closed circuit of an exchange device is provided.

1 is a block diagram of a closed circuit of a conventional automatic tool changer.

Figure 2 is a view showing the internal air inflow prevention structure of the closed circuit of the automatic tool changer according to an embodiment of the present invention.

Explanation of symbols on the main parts of the drawings

1: connector 2: spring

3: first piston 4: packing

5: second piston 6: cylinder

7: first clamp valve 8: unclamp valve

9: air blow valve 10: second clamp valve

11: silencer

As a means for achieving the above object, the configuration of the present invention, the first piston and the second piston which is provided with an oil in the interior of the cylinder, and elastic means for providing an elastic force to the first piston; Sealing means provided between the second piston and the cylinder to seal the oil, a clamp valve for providing air pressure for operating the first piston, and air pressure for operating the second piston. An unclamp valve for providing, an air blow valve for providing air pressure to the main shaft, and a silencer for discharging air in the cylinder to the outside during the tool clamp.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described in detail with reference to the accompanying drawings in order to describe in detail enough to enable those skilled in the art to easily carry out the present invention. .

For reference, the embodiments disclosed herein are only presented by selecting the most preferred examples to help those skilled in the art from the various possible examples, the technical spirit of the present invention is not necessarily limited or limited only by this embodiment. .

As shown in FIG. 2, the internal air inflow prevention structure of the closed circuit of the automatic tool changer according to the embodiment of the present invention includes a first piston having an oil interposed therebetween. 3) and the second piston (5), the spring (2) for providing an elastic force to the first piston (3), and the second piston (5) and the cylinder (6) to seal the oil To provide a packing 4 provided therebetween, a clamp valve 7 for providing air pressure for operating the first piston 3, and pneumatic pressure for operating the second piston 5 described above. An unclamp valve (8), an air blow valve (9) for providing air pressure to the main shaft, and a silencer (11) for discharging air in the cylinder (6) to the outside during tool clamping.

According to the above configuration, the operation of the internal air inflow prevention structure of the closed circuit of the automatic tool changer according to the embodiment of the present invention is as follows.

When air is introduced through the unclamp valve 8 to push the second piston 5 to the left during tool unclamping, oil contained between the second piston 5 and the first piston 3 is removed. When the first piston 3 is moved to the left in this way, the connector 1 and the spring 2 are operated by the operation of the piston 3 to free the tool. The process of clamping is the same as in the prior art.

In the tool clamp, air is introduced through the first clamp valve 7 to push the first piston 3 to the right, and the restoring force of the spring 2 also works together. In this case, the internal air of the cylinder 6 is discharged to the outside through the silencer 11, so that the space between the second piston 5 and the first piston 3 is between the packing 4 and the piston 5. The oil contained in the air will not seep through the air.

As described above, in the embodiment of the present invention, the automatic tool change having the effect of smoothly clamping and unclamping operations by blocking the inflow of air into the closed circuit to prevent air from seeping into the oil during tool clamping. It is possible to provide an internal air inflow prevention structure of the closed circuit of the device. Such effects of the present invention can be used in a variety of applications within the scope of the technical idea of the present invention in the field of machine tools.

Claims (1)

A first piston and a second piston installed with an oil in the cylinder, elastic means for providing an elastic force to the first piston, and between the second piston and the cylinder to seal the oil. And a clamp valve for providing air pressure for operating the first piston, an unclamp valve for providing air pressure for operating the second piston, and for providing air pressure to the main shaft. And an air blow valve and a silencer for discharging air in the cylinder to the outside during tool clamping.