JP2004108529A - Dust-proof guide device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a compact dust-proof guide device of long service life. <P>SOLUTION: This device comprises a ball screw 1 and a rotating shaft receiver 2 congifurating a guide mechanism part, a driving part 3 for driving the guide mechanism part, a movable part 4 connected to the guide mechanism part, and sealing covers 5A, 5B covering the the guide mechanism part and a sliding part of the movable part, and being expandable and contractible in the sliding direction, and the movable part 4 comprises a pipe 7 communicating two spaces 6A, 6B partitioned by the movable part. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a dustproof type guide device, and more particularly, to a dustproof type guide device that protects a sliding portion of a linear motion reciprocating mechanism such as a ball screw mechanism, a cylinder mechanism, and a slide shaft mechanism by isolating the sliding portion from an atmosphere such as dust.
[0002]
[Prior art]
For example, in the manufacturing process of factories such as steel mills, large and small dust and oil mist are scattered from iron powder of rolled steel and cooling water during rolling, and such atmosphere is always drifting in the factory. I have.
[0003]
Therefore, in the components of the guide device having various guide mechanisms used in various places in such an atmosphere, for example, in the case of a ball screw mechanism, a cylinder mechanism, and a slide shaft mechanism, the outside thereof is covered with a cover of the device. Even if it is protected, there is a limit.If it is used for a long time, dust and oil mist contained in this atmosphere get into the sliding bearing and the feed screw, causing early wear and failure of the sliding part. However, there is a problem that the operation of the equipment is unavoidable and malfunctions occur.
[0004]
FIG. 3 illustrates a conventional dustproof type guide device. 1 is a ball screw, both sides of which are supported by rotary bearings. The ball screw 1 is rotated forward and backward by a drive motor 3 connected to one end of the ball screw 1, and a movable portion 4 connected to the thread portion of the ball screw 1 is linearly reciprocated. The sliding portion between the ball screw 1 and the movable portion 4 is covered and sealed by elastic bellows 5A and 5B.
[0005]
However, the two spaces 6A and 6B partitioned by the movable portion 4 have internal volumes that change due to the movement of the movable portion 4 (breathing). Therefore, the bellows 5A and 5BB that expand and contract the holes 5AP and 5BP as shown in FIG. It is necessary to provide some space so that each space can breathe.
[0006]
Therefore, such a sealing means cannot completely ensure airtightness.
[0007]
Further, even when the moving speed of the movable portion 4 is slow and it is not necessary to provide such a large hole in one place, a large number of minute holes are provided in the bellows for breathing in two spaces.
[0008]
Dust, oil mist, and the like are mixed in from such a breathing hole, and components and sliding parts are liable to wear and rust, resulting in malfunction.
[0009]
Therefore, in the conventional dustproof mechanism, the bellows that expand and contract are made of an airtight material, the holes for breathing are eliminated, and the movable space is made to breathe in the expandable and contractible cushion chamber to make the sliding parts airtight. There are also some (for example, see Patent Document 1).
[0010]
[Patent Document 1]
JP-A-8-54062
[Problems to be solved by the invention]
However, the expanding and contracting cushion chamber newly provided for breathing the movable space becomes large, and it is necessary to provide a special installation space. In addition, a breathing mechanism including a pipe to the cushion chamber becomes a load on a driving source such as a motor or air that moves the sliding mechanism, and is not suitable for fast operation. Further, when the cushion chamber is constantly moved, its life is shortened due to repeated expansion and contraction.
[0012]
SUMMARY OF THE INVENTION An object of the present invention is to provide a small, long-life, dust-proof type guide device in which new structures are reduced as much as possible.
[0013]
[Means for Solving the Problems]
In order to achieve the above object, a guide device of the present invention includes a guide mechanism, a drive unit that drives the guide mechanism, a movable unit connected to the guide mechanism, and a guide unit and the movable unit. It is characterized by comprising a sealing cover which covers the sliding portion and is extendable and contractible in the sliding direction, and means for communicating the two spaces partitioned by the movable portion.
[0014]
ADVANTAGE OF THE INVENTION According to this invention, a new component is unnecessary and a small and long-life dustproof type guide apparatus can be provided. In addition, by changing the shape of the ventilation hole, the movement of the movable portion can be set with predetermined characteristics, and a dustproof type guide device that can move at a higher speed with lower power than the conventional cushion chamber method can be provided.
[0015]
BEST MODE FOR CARRYING OUT THE INVENTION
(First Embodiment)
Hereinafter, a first embodiment of a dustproof type guide device according to the present invention will be described with reference to FIG. In FIG. 1, reference numeral 1 denotes a ball screw, and one end of the ball screw 1 is supported by a rotary bearing 2A.
[0016]
The other end of the ball screw 2 is supported by a rotary bearing 2B, protrudes from the rotary bearing 2B, and is rotated forward and reverse by a drive motor 3 connected to the end, and is connected to the threaded portion of the ball screw 2. The moved movable part 4 is linearly reciprocated.
[0017]
The sliding portion between the ball screw 2 and the movable portion 4 is covered and sealed with a bellows 5A, 5B which is made of a material capable of ensuring airtightness, such as neoprene cloth. Each breathing space 6A, 6B partitioned by the movable part 4 is communicated by a pipe 7.
[0018]
One end of the pipe 7 is connected to a pipe joint provided on the rotary bearings 2A, 2B serving as fixed walls of the breathing spaces 6A, 6B, respectively, and the rotary bearings 2A, 2B having an inner diameter of the joint as a through diameter. The breathing spaces 6A and 6B communicate with each other through the provided ventilation holes 2AP and 2BP.
[0019]
Usually, a detection sensor (not shown), a movable actuator, and the like are attached to the upper portion of the movable portion 4 and are repeatedly guided and driven to a predetermined position according to predetermined control.
[0020]
Next, the operation of the dustproof type guide device thus configured will be described. For example, the rotating motor 3 is moved in a left (L) right (R) direction by a control device (not shown).
[0021]
When the movable part 4 is located at the center of the ball screw 1, the left and right breathing spaces 6A and 6B have the same volume. For example, a command to move the movable part 4 from the center of the ball screw 1 in the L direction is issued. When received, the breathing space 6A becomes smaller and the breathing space 6B tends to become larger, so that the air inside the respective breathing spaces 6A and 6B moves via the pipe 7 according to the moving speed of the movable part 4. .
[0022]
Conversely, when a command to move in the R direction is received, the opposite is true. The moving speed is controlled below a predetermined speed at which the respiratory spaces 6A, 6B covered by the bellows 5A, 5B can withstand the internal pressure.
[0023]
Therefore, by providing the conventional device with the pipes 7 communicating with the vent holes 2AP, 2BP and the outside on the rotary bearings 2A, 2B, a dust-proof type guide device can be relatively easily formed.
[0024]
(Second embodiment)
Hereinafter, a second embodiment of the dustproof type guide device according to the present invention will be described with reference to FIG. The description of the same components and operations as those described in the first embodiment will be appropriately omitted.
[0025]
The difference from the first embodiment is that, in the first embodiment, the piping 7 that connects the breathing spaces 6A and 6B outside is provided, but in the second embodiment, the breathing spaces 6A and 6B are The difference is that a plurality of holes are provided symmetrically with respect to the center of the ball screw 1 with respect to the center of the ball screw 1 with a vent hole 4P in a part of the movable part 4 to be partitioned. Other configurations and operations are the same.
[0026]
As in the first embodiment, the moving speed is set to a predetermined range of the diameter and the number of the ventilation holes 4P so that the breathing spaces 6A and 6B covered by the bellows 5A and 5B can withstand the internal pressure. Then, control is performed at a predetermined speed or less.
[0027]
Therefore, according to this configuration, it is possible to provide a small dustproof type guide device having no newly added components and a shape smaller than that of the conventional device.
[0028]
【The invention's effect】
As described above, according to the present invention, since the sliding portion is made airtight, it is possible to provide a small dustproof type guide device protected from the external atmosphere environment and not polluting the external environment by dust. .
[Brief description of the drawings]
FIG. 1 is a configuration diagram showing an embodiment of the present invention.
FIG. 2 is a configuration diagram showing an embodiment of the present invention.
FIG. 3 is an explanatory view of a conventional linear reciprocating mechanism such as a ball screw.
[Explanation of symbols]
1 ball screw,
2A, 2B Rotary bearing 2P Vent 3 Drive motor 4 Movable guide table 4P Vent 5A, 5B Bellows 5AP, 5BP Vent 6A, 6B Respiratory chamber 7 Piping

Claims (5)

A guide mechanism,
A drive unit for driving the guide mechanism,
A movable part connected to the guide mechanism,
A sealing cover that covers a sliding part of the guide mechanism and the movable part, and that can expand and contract in the sliding direction;
Means for communicating two spaces separated by the movable portion. 2. The dustproof type guide device according to claim 1, wherein the means for communicating the two spaces separated by the movable portion is a pipe connecting respective ventilation holes provided in the rotary bearing portion. The dustproof type guide device according to claim 1, wherein the means for communicating the two spaces separated by the movable part is a vent provided in the movable part. The dust-proof type guide device according to claim 1, wherein the guide mechanism is a mechanism that reciprocates linearly. The dustproof type guide device according to claim 1, wherein the extendable sealing cover is formed of a tubular member having a bellows structure that can extend and contract in a linear motion direction.

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