KR900008001Y1 - Door device - Google Patents

Abstract

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Description

Automatic opening and closing device of machine tool

1 is a cross-sectional view of a conventional door opening and closing device.

2 is a cross-sectional view of another conventional door opening and closing device.

3 is a cross-sectional view of the automatic door opening and closing device in the present invention.

4 is a cross-sectional view of portion A of FIG.

5 is a cross-sectional view of the portion B of FIG.

6 is a relationship diagram between the guide and the guide shaft of FIG.

* Explanation of symbols for main parts of the drawings

21: upper door 22: lower door

23: cover 24: cylinder

25: piston shaft 26: connecting member

27: expectation 28, 29: upper and lower pulleys

30: wire 37: guide shaft

38: guide plate

The present invention relates to a door automatic opening and closing device using a cylinder, and more particularly to a door automatic opening and closing device of a machine tool that can automatically open and close two doors using one cylinder.

In general, tools or workpieces that rotate at high speed during machining by machine tools are often detached from the machine and cause a safety accident. The door will be attached for inspection or troubleshooting.

The door opening and closing device of the machine tool is a general technical means for opening and closing the door by the operation of the hydraulic pressure.

A conventional apparatus for opening and closing a door by hydraulic operation will be described with reference to FIG. 1 as follows.

The bracket 2 is fixed to the door 1, and one end of the bracket 2 is fixed to the piston shaft 4 moving up and down from the cylinder 3 so that the door 1 is operated by the operation of the cylinder 3. It is configured to open and close. In general, when one door is installed, the size of the door must be increased, and in order to open and close a large door, a large cylinder must be installed, and the stroke distance of the piston shaft is also increased.

A conventional door opening and closing device for solving such a problem will be described with reference to FIG. 2 as follows.

The upper and lower piston shafts 16, which fix the brackets 12 and 13 to the upper door 10 and the lower door 11, and move the brackets 12 and 13 in the upper and lower cylinders 14 and 15. The upper door 10 is fixed to 17) and the lower door 11 is configured to be opened and closed separately by the operation of the lower cylinder 15 by the upper cylinder 14. Such technical means can solve the problem of one large capacity cylinder, but not only two cylinders should be used but also a problem that the stroke length of the piston shaft along two cylinders becomes large.

The present invention is devised to solve the problems associated with the prior art as described above.

An object of the present invention is to open and close two doors simultaneously by one small cylinder, to allow the door to be accurately guided and moved along the guide shaft, and to allow the two doors to be smoothly operated by wires. An automatic door opening and closing device is provided.

The above object of the present invention can be achieved by a configuration for fixing the upper and lower doors to the wire, mounting the hydraulic cylinder on the upper door, and to move up and down along the guide shaft on the upper and lower doors.

The automatic door opening and closing device of the present invention will be described in detail with reference to FIGS. 3 to 6 as follows.

The upper door 21 and the lower door 22 are installed on the cover 23 of the machine tool to move up and down so that the door is opened and closed. The upper door 21 is fixed to the piston shaft 25 of the cylinder 24 by the interposition of the connecting member 26. The base 27 is equipped with an upper pulley 28 and a lower pulley 29 and a wire 30 is installed on the upper and lower pulleys 28 and 29 to be rotated. The plate 31 is fixed to the upper door 21 and the wire 30 in the inward direction is fixed to the plate 31 as the nut 32 and the bolt 33. Fixing the plate 34 to the lower door 22; The plate 34 is fixed to the wire 30 nut 35 and the bolt 36 in the outward direction. The guide shaft 37 is positioned between the wires 30 so as to be fixed to the base 27.

The guide plate 38 is fixed to the upper and lower doors 21 and 22 at appropriate intervals so that the guide plate 38 can be moved along the guide shaft 37.

Referring to the effect of the present invention configured as described above in detail.

When the upper and lower doors 21 and 22 are to be opened for detachment of the work or inspection of the inside of the machine tool or necessary repair, the cylinder 24 is operated to raise the piston shaft 25.

When the piston shaft 25 is raised, the upper door 21 fixed to the piston shaft 25 is raised along the guide shaft 37 and the wire 30 fixed to the upper door 21 is pulled up and down ( 28) It rotates counterclockwise around (29). Since the lower door 22 is fixed to the wire 30 on the side opposite to the wire 30 to which the upper door 21 is fixed, the lower door 22 is guided when the wire 30 rotates counterclockwise. It descends along axis 37.

As such, the upper door 21 and the lower door 22 are fixed to one wire 30 in a state opposite to each other, so that when the upper door 21 is moved upward by the operation of the cylinder 24, the lower door When the upper portion 22 is moved upward by the operation, the lower door 22 is lowered opposite to the upper door 21 so that the upper and lower doors 21 and 22 are opened. In order to close the upper and lower doors 21 and 22, the cylinder 24 is operated to lower the piston shaft 25. When the piston shaft 25 descends, the upper door 21 also descends along the guide shaft 37, and the wire 30 fixed to the upper door 21 rotates clockwise. When the wire 30 rotates in the clockwise direction, the lower door 22 fixed in the other direction of the wire 30 rises in the opposite direction to the upper door 21, so that the upper and lower doors 21 and 22 approach each other. Will be closed.

As described above, when the upper door is moved up and down by the operation of the cylinder, the upper and lower doors are opened and closed because they are fixed to one wire to face each other. Moreover, the upper and lower doors are fixed to one wire installed on the upper and lower pulleys, so that the upper and lower doors can be smoothly moved even if a small cylinder is used. That is, when the upper door is raised, the lower door can be easily lowered by its own weight, and when the upper door is lowered, the lower door can be raised by a small force by its own weight. Therefore, it is a useful design that can easily open and close two doors using a single cylinder and minimize the stroke distance of the piston shaft.

Claims (1)

In the door automatic opening and closing device of a machine tool which is opened and closed by moving the upper and lower doors (21) and (22) in a direction opposite to each other in the cover (23), the piston shaft (25) fixed to the upper door (21) Excitation cylinder 24, upper and lower pulleys 28 and 29 mounted on base 7, wires 30 rotatably provided at upper and lower pulleys 28 and 29, and wires 30 inwardly. The upper door 21 is fixed to the lower door 22 to the wire 30 in the outward direction, so that the upper and lower doors can be moved along the guide shaft 37 installed perpendicular to the base 7. Automatic door opening and closing device of a machine tool.