JPH11239948A - Dust-proof device for linear servomotor drive mechanism - Google Patents

Abstract

PROBLEM TO BE SOLVED: To well eliminate even foreign matter of iron powder or the like having magnetism, so as to well maintain an operating condition of a linear motor over a long period. SOLUTION: Side covers 3, 4 are fixedly vertically provided in both sides of a fixed side member 2, an upper dust-proof cover 5 by non-magnetic flexible sheet material covering an opposed surface 2a of a movable side member 1 of the fixed side member 2 is connected to the side covers 3, 4, the upper dust- proof cover 5 is supported by the side covers 3, 4. A lifting slider 9 is provided in a side of the movable side member 1, the upper dust-proof cover 5 is brought up from the fixed side member 2, foreign matter on the upper dust-proof cover 5 is removed by a scraper brought into slide contact with the lifted upper dust- proof cover 5.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a dustproof device for a linear servomotor drive mechanism, and more particularly, to a dustproof device for a linear servomotor drive mechanism used as a linear drive mechanism in machinery such as various industrial machines and machine tools. It concerns the device.

[0002]

2. Description of the Related Art Depending on the environment in which a linear servomotor driving mechanism is used, there is a possibility that dust and other foreign substances, particularly iron powder having magnetic properties, may enter the moving surface of the linear servomotor. Intrusion of foreign matter, such as iron powder, causes running obstacles of the linear motor, and foreign matter bites into the movable and fixed parts, adversely affecting the operation of the linear motor.

An example of a technique for preventing intrusion of dust and other foreign matters in a linear motor driving mechanism is disclosed in Japanese Patent Application Laid-Open No. 63-180443.
The dustproof device disclosed in this publication includes a nonmagnetic dust cover that covers the upper surface of a fixed member (stator), a dustproof cover attached to a movable member (movable member), and an outer surface of the dustproof cover at a leading edge. And a scraper that comes into contact with the scraper.

According to the dustproof device having the above-described configuration, the stator constituting the stationary member is covered and protected by the nonmagnetic dustproof cover, and the scraper is moved by the non-magnetic dustproof cover as the movable member travels. By sliding on the outer surface of the non-magnetic material dust cover, dust and other foreign substances adhered and accumulated on the outer surface of the nonmagnetic dustproof cover are scraped off, and the foreign substances are removed.

[0005]

However, Japanese Patent Application Laid-Open No.
In the dustproof device disclosed in Japanese Patent Publication No. 180443, the nonmagnetic dustproof cover is bonded to the upper surface of the fixed member with an adhesive or the like to cover and protect the upper surface of the fixed member. If a gap is formed between the fixed member and the upper surface of the fixed member due to a defect or peeling due to use for a long period of time, or if the nonmagnetic dust cover is lifted up from the upper surface of the fixed member for any reason, dust may be generated. In addition, foreign matter may enter between the upper surface of the linear member fixing side member and the nonmagnetic dustproof cover, and may adversely affect the operation of the linear motor.

Further, scraping of dust and foreign matter by the scraper is performed by using a strong magnetic force of the fixed-side member acting on the dust-proof cover and adsorbing to the outer surface of the dust-proof cover with respect to iron powder having magnetism. The scraper cannot be scraped off better than the outer surface of the dustproof cover (cover upper surface), and the scraper only moves on the outer surface of the dustproof cover made of non-magnetic material. Can not.

SUMMARY OF THE INVENTION The present invention has been made in order to solve the above-described problems. In a linear servomotor driving mechanism, it is possible to reliably perform dust-proofing of a fixed-side member over a long period of time when dust is generated over time. Another object of the present invention is to provide a dustproof device capable of satisfactorily removing foreign substances such as iron powder having magnetism and maintaining the operating state of the linear motor in a good condition for a long period of time.

[0008]

In order to achieve the above-mentioned object, a dust-proof device for a linear servomotor drive mechanism according to the present invention comprises a linear member composed of a fixed member and a movable member formed by a field and an armature. In a dustproof device of a servo motor drive mechanism, a side cover extending parallel to the extending direction of a fixed side member in a state of being erected and fixed on both sides of a fixed side member, and both side ends connected to the side cover An upper dust-proof cover made of a non-magnetic flexible sheet material that is supported by the side cover and covers a surface of the fixed-side member facing the movable-side member, and is slidable with the upper dust-proof cover provided on the movable-side member side. And a lift slider that is provided on the movable member and lifts the upper dust-proof cover from the fixed member by running movement of the movable member. Upper dust cover lifted Te are those constituted by a sliding contact scraper.

In a dustproof device for a linear servomotor drive mechanism according to the next invention, a labyrinth seal structure for allowing the upper dustproof cover to be lifted with respect to the side cover is incorporated in a connection portion between the side cover and the upper dustproof cover. Is what it is.

In the dustproof device for a linear servomotor drive mechanism according to the next invention, the scraper is inclined forward and backward with respect to the traveling direction of the movable member.

In a dustproof device for a linear servomotor driving mechanism according to the next invention, a sweeping brush is provided on the scraper.

In the dustproof device for a linear servomotor drive mechanism according to the present invention, the side covers are on both sides of the fixed member and have different heights, and the upper dust cover is perpendicular to the traveling direction of the movable member. In the vertical direction.

[0013]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view of a dustproof device for a linear servomotor driving mechanism according to the present invention.

Embodiment 1 FIGS. 1 to 5 show a first embodiment of a linear servomotor driving mechanism provided with a dustproof device according to the present invention.

The linear servomotor driving mechanism has a movable primary coil (armature) 1 having a multilayer winding which is attached to the traveling body 20 and generates a moving field in a linear direction. It has a structure in which magnets are arranged in a straight line, and has a fixed secondary magnet (field field) 2 which extends in the direction of linear motion in a fixed arrangement. The movable primary coil 1 is separated from the fixed secondary magnet 2. In the state of floating, on the fixed-side secondary magnet 2,
The vehicle travels in the left-right direction as viewed in FIGS.

On both sides of the fixed secondary magnet 2, side covers 3, 4 are fixedly arranged in an upright state. The side covers 3, 4 extend over the entire area of the fixed-side secondary magnet 2 in parallel with the direction in which the fixed-side secondary magnet 2 extends.
The side covers 3 and 4 have sufficient rigidity to be self-supporting, and can be made of a suitable metal material or synthetic resin.

An upper dust-proof cover 5 made of a non-magnetic flexible sheet material such as a stainless steel sheet or a synthetic resin sheet is disposed above the fixed-side secondary magnet 2. The upper dustproof cover 5 extends over the entire area of the fixed-side secondary magnet 2, is connected to the side covers 3, 4 on both sides, is supported by the side covers 3, 4, and is fixed to the fixed-side secondary magnet 2. The side magnet 2 covers a surface (upper surface) 2a facing the movable-side primary coil 1.

A labyrinth seal structure 6 that allows the upper dustproof cover 5 to be lifted and moved with respect to the side covers 3 and 4 is incorporated in a connection portion between the side covers 3 and 4 and the upper dustproof cover 5. The labyrinth seal structure 6 is fixed to a side edge of the upper dustproof cover 5 and
Grooved sealing member 7 extending over the entire area in the extending direction of
The upper edge 3a of the side cover 3 or the upper edge 4a of the side cover 4 is fitted in the entire area of the groove 7a of the grooved seal member 7 so as to be able to enter and exit, thereby performing a labyrinth seal.

A traveling body 2 is provided around the movable primary coil 1.
A movable section cover 8 is provided which is attached to the movable side and moves together with the movable side primary coil 1. On both sides of the movable portion cover 8, a lift slider 9 having a groove which is slidably engaged with the side edge portion 5 a of the upper dustproof cover 5 is attached.

As shown in FIG. 5, the height position of the lift slider 9 is equal to that of the upper dustproof cover 5 in a normal state.
Is higher than the height of
The upper dust-proof cover 5 is lifted in the engagement region with the lift slider 9 in a direction away from the upper surface 2 a of the fixed-side secondary magnet 2, and this lift position is movable with elastic deformation of the upper dust-proof cover 5. It is displaced as the primary coil 1 travels.

Even if the upper dustproof cover 5 is lifted, the labyrinth seal by the labyrinth seal structure 6 is maintained by the fitting margin of the upper edges 3a, 4a of the side covers 3, 4 into the groove 7a of the grooved seal member 7. It works effectively.

A scraper 10 is mounted on the movable cover 8. As shown in FIG. 3, the scrapers 10 are provided on both the front and rear sides in the reciprocating movement direction of the movable primary coil 1 so as to be inclined forward and backward with respect to the traveling movement direction of the movable primary coil 1. , And slides on the upper surface 5b of the upper dustproof cover 5 lifted by the lift slider 9. As shown in FIG. 4, the scraper 10 has an edge portion 10a, and is made of a rubber or resin material that does not damage the upper dustproof cover 5. Further, a sweeping brush 12 having brush bristles 11 made of a resin material or the like is attached to the scraper 10.

With the above-described configuration, the upper dustproof cover 5 is spaced above the fixed secondary magnet 2 of the linear servomotor to protect the fixed secondary magnet 2 and to fix the fixed secondary magnet. Smooth and seamless surface irrespective of the joint or surface roughness of the magnet 2 (surface facing the movable primary coil 1)
I will provide a.

Side covers 3 and 4 and upper dustproof cover 5
Are connected by the labyrinth seal structure 6 so that they cooperate with each other to form a substantially closed structure dome shape to cover the entirety of the fixed-side secondary magnet 2, and Complete protection from dust.

The upper dust-proof cover 5 is slidably engaged with the lift slider 9 so that the movable primary coil 1 is movable.
As shown in FIG. 5, the scraper 10 is lifted from the upper surface 2a of the fixed-side secondary magnet 2 in accordance with the traveling movement of the scraper 10 on the upper surface 5b of the lifted upper dustproof cover 5.
Slides on the upper surface 5b of the upper dust-proof cover 5 with the traveling movement of the movable primary coil 1, thereby scraping off and removing foreign matter and dust attached and deposited on the upper surface 5b of the upper dust-proof cover 5. .

The magnetic force on the upper surface 5b of the upper dust-proof cover 5 becomes weaker in the region above the upper surface 2a of the fixed secondary magnet 2 due to the distance from the upper surface 2a. Since the scraping is performed, foreign matter such as iron powder having magnetism can be satisfactorily removed without being strongly affected by the magnetic force of the fixed-side secondary magnet 2.

Further, since the scraper 10 is tilted back and forth with respect to the traveling direction of the movable primary coil 1, the scraped foreign substances and dust can be removed by the upper dustproof cover as the movable primary coil 1 travels. The foreign matter and dust that have flowed to the side on the upper surface 5b of the dust 5 and are scraped off are quickly removed from the upper surface 5b of the upper dust cover 5.

Further, the sweeping brush 1 is attached to the scraper 10.
2, coarse foreign substances, dust, etc., which are coarse and do not stick to the upper surface 5 b of the upper dust-proof cover 5, are swept away by the sweeping brush 12, and fine foreign substances sticking to the upper surface 5 b of the upper dust-proof cover 5 are removed. Dust and the like are scraped off by a scraper 10 having an edge portion 10a, and foreign matter and dust are removed by a scraper 10 and a sweeping brush 12.
By doing so, foreign matter and dust can be efficiently eliminated.

Embodiment 2 FIG. 6 shows a second embodiment of a linear servomotor driving mechanism provided with a dustproof device according to the present invention. In FIG. 6, portions corresponding to those in FIG. 1 are denoted by the same reference numerals as those in FIG. 1, and description thereof is omitted.

In this embodiment, the side covers 3 and 4
The upper dust-proof cover 5 is vertically inclined in a direction (left-right direction in FIG. 1) orthogonal to the traveling direction of the movable primary coil 1 due to the difference in height. .

As described above, since the upper dust-proof cover 5 is inclined vertically, the upper surface 5
Dust and foreign matter hardly accumulate on b, and even if it accumulates, dust and foreign matter can be more efficiently removed. For example, dust and foreign matter on the upper surface 5b of the upper dust-proof cover 5 that are scraped off by the scraper 10 or swept away by the sweeping brush 12 slide down on the upper surface 5b due to gravity, and fall on the upper surface 5b of the upper dust-proof cover 5. Removed more quickly.

[0032]

As can be understood from the above description, according to the dustproof device of the linear servomotor driving mechanism according to the present invention, the scraper slides on the upper dustproof cover lifted from the fixed member by the lift slider. Since foreign matter and dust are scraped off, foreign matter such as iron powder having magnetism can be removed well without being strongly affected by the magnetic force of the fixed side member, and the operation state of the linear motor can be maintained for a long time. It will be kept well.

According to the dustproof device of the linear servomotor drive mechanism according to the next invention, since the labyrinth seal structure is incorporated in the connection portion between the side cover and the upper dustproof cover, the side cover and the upper dustproof cover are mutually shared. The fixed-side member covers the whole of the fixed-side member in the form of a dome having a substantially hermetic structure, thereby completely protecting the fixed-side member from foreign matter and dust. Will be kept well.

According to the dustproof device of the linear servomotor drive mechanism according to the next invention, since the scraper is inclined back and forth with respect to the traveling direction of the movable member, foreign matter and dust scraped by the scraper can be removed. As the member travels, it flows laterally on the upper surface of the upper dust-proof cover and is quickly removed, so that the operating state of the linear motor can be kept in good condition for a long period of time.

According to the dustproof device of the linear servomotor drive mechanism according to the next invention, since the scraper is provided with the sweeping brush, the scraper is used to scrape foreign matter and dust and the sweeping brush to remove foreign matter and dust. By the sweeping, foreign matter and dust are satisfactorily removed from the upper surface of the upper dust-proof cover, and the operation state of the linear motor can be kept good for a long period of time.

According to the dustproof device of the linear servomotor drive mechanism according to the next invention, since the upper dustproof cover is vertically inclined in a direction orthogonal to the traveling direction of the movable member, the dustproof cover is provided on the upper surface of the upper dustproof cover. Foreign matter is less likely to accumulate, and even if it accumulates, dust and foreign matter that are scraped off by a scraper or swept away by a sweeping brush slide down on the upper surface of the upper dustproof cover due to gravity, and from the upper surface of the upper dustproof cover. The linear motor is quickly removed, and the operating state of the linear motor can be maintained well over a long period of time.

[Brief description of the drawings]

FIG. 1 is a front sectional view showing a first embodiment of a dustproof device for a linear servomotor drive mechanism according to the present invention.

FIG. 2 is a side view showing a first embodiment of a dustproof device for a linear servomotor drive mechanism according to the present invention, with a portion cut away.

FIG. 3 is a plan view showing Embodiment 1 of the dustproof device for a linear servomotor drive mechanism according to the present invention.

FIG. 4 is an enlarged sectional view taken along line AA of FIG. 3;

FIG. 5 is a schematic side view showing an operation state of the first embodiment of the dustproof device for the linear servomotor drive mechanism according to the present invention;

FIG. 6 is a front sectional view showing Embodiment 1 of the dustproof device for the linear servomotor drive mechanism according to the present invention.

[Explanation of symbols]

1 Movable primary coil, 2 Fixed secondary magnet, 3, 4
Side cover, 5 upper dustproof cover, 6 labyrinth seal structure, 7 grooved seal member, 8 movable part cover,
9 Lift slider, 10 Scraper, 11
Brush bristles, brush for 12 sweeps.

Claims (5)

[Claims] 1. A dustproof device for a linear servomotor drive mechanism comprising a fixed side member and a movable side member composed of a field and an armature, wherein the dustproof device is fixed on both sides of the fixed side member in a state of standing and fixedly arranged. A side cover extending parallel to the direction in which the side member extends, a nonmagnetic flexible member having both side ends connected to the side cover and supported by the side cover, and covering a surface of the fixed side member facing the movable side member; An upper dust-proof cover made of a conductive sheet material, a lift slider provided on the movable-side member side, slidably engaging with the upper dust-proof cover, and lifting the upper dust-proof cover from the fixed-side member by moving the movable-side member. A scraper provided on the movable side member and slidably contacting the upper dustproof cover lifted by the lift slider. Dust-proof apparatus of Asabomota drive mechanism. 2. A labyrinth seal structure for allowing a lifting movement of the upper dust-proof cover with respect to the side cover at a connection portion between the side cover and the upper dust-proof cover. Dustproof device for linear servomotor drive mechanism. 3. The dustproof device for a linear servomotor drive mechanism according to claim 1, wherein the scraper is inclined forward and backward with respect to the traveling direction of the movable member. 4. The dustproof device for a linear servomotor drive mechanism according to claim 1, wherein a sweeping brush is provided on the scraper. 5. The apparatus according to claim 1, wherein the side covers are on both sides of the fixed member and have different heights, and the upper dust cover is vertically inclined in a direction perpendicular to the traveling direction of the movable member. The dustproof device for a linear servomotor drive mechanism according to any one of claims 1 to 4, wherein: