JPH08141876A - Slide device - Google Patents

Abstract

PURPOSE: To provide a slide device using a protecting cover, which is fixed without stretching operation. CONSTITUTION: A bearing nut 3, which is installed in a ball screw shaft 2, is moved forward and backward by the rotary drive of the ball screw shaft 2, and a work table 1 is fixed to a support bracket 4 fixed to this bearing nut 3, and this work table 1 is moved forward and backward in the axial direction of the ball screw shaft 2. A space 4a, in which a protecting cover 6 for protecting the ball screw shaft 2 and the bearing nut 3 is to be arranged, is provided between the support bracket 4 and the work table 1, and a protecting cover 6 is provided in this space 4a so as to allow the forward and backward movement of the work table 1. At least one guide rail 7 is provided in parallel with the ball screw shaft 2, and a rail slider 8 is provided in this guide rail 7 freely to be slid, and the protecting cover 6 is formed so as to cover the most outside of the ball screw shaft 2 and the guide rail 7, which are provided in parallel with each other.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a slide device having a protective cover mounted on a sliding portion or a driving portion of a mechanical device, a jig or the like.

[0002]

2. Description of the Related Art As a conventional slide device with a protective cover, as shown in FIG. 6, for example, a sliding portion and a driving portion are covered with a bellows 13, and abnormalities due to mixing of cutting chips, cutting fluid or foreign matter are caused. It prevents wear and early life. In many cases, neoprene cloth is used as the material, which is excellent in oil resistance and weather resistance.

Further, recently, due to the progress of work robots, unmanned operation has become possible, and slide devices have come to be used in poor working environments such as exposure to high temperature and welding spatter.

As a protective cover of the slide device at this time, as shown in FIG. 7, a slide-type divided metal cover 14 is used, and is expanded and contracted by the movement of the slide device.

[0005]

However, the slide device with a protective cover, which occupies most of the above-mentioned two types of conventional devices, has the following drawbacks. The bellows type protective cover 13 formed of the neoprene cloth is
Cutting scraps with sharp edges are not susceptible to cuts due to their expansion and contraction movements and have no durability. The sliding surface is exposed after several months, and the welding spatter causes the bellows 13 due to the heat of the spatter. There is a problem in that welding spatter adheres to the sliding portion and the driving portion after being melted and slides there, so that the sliding surface is scratched and the accuracy is lowered.

[0006] Further, a metallic slide-type protective cover 14
After being used for a long period of time, cutting scraps, spatters, etc. also enter from the overlapping portion of the cover 14b, and the sliding portion 14
a may be affected.

Further, when each cover 14b expands and contracts, the sliding resistance between the covers 14b is large because they rub against each other, and the sliding resistance is further increased due to deformation and clogging during use. Since it will increase, it is necessary to increase the driving force of the slide device in anticipation of it. Also, cover 1
It was necessary to lengthen the rail 14a by the amount of expansion and contraction of 4b.

The problem to be solved by the present invention is to provide a slide device using a fixed protective cover that does not expand and contract.

[0009]

In order to achieve the above object, the invention described in claim 1 is a bearing nut mounted on a ball screw shaft by rotationally driving the ball screw shaft. Back and forth, fix the work table to the support bracket fixed to this bearing nut,
This work table is moved back and forth in the axial direction of the ball screw shaft, and a space is provided between the support bracket and the work table for disposing a protective cover for protecting the ball screw shaft and the bearing nut. The protective cover is provided so as to allow the work table to move back and forth.

According to a second aspect of the present invention, in the slide device according to the first aspect, at least one guide rail is provided in parallel with the ball screw shaft, and a rail slider is slidable on the guide rail. It is characterized in that the protective cover is formed so as to cover up to the outermost side of the ball screw shaft and the guide rail arranged in parallel.

According to a third aspect of the present invention, in the slide device according to the first or second aspect, the support bracket is fixed to the bearing nut from the axial direction of the ball screw shaft or a direction orthogonal to the axial direction. It is characterized by having done.

According to a fourth aspect of the present invention, in the slide device according to the second aspect, the protective cover has an upper surface portion that covers the ball screw shaft and the guide rail arranged in parallel, and both sides of the upper surface portion. It is characterized in that it is composed of an extension part that covers the side.

According to a fifth aspect of the present invention, in the slide device according to the third aspect, the support bracket includes both extending support portions that pass through both extending portions of the protective cover, and both extending portions. It is characterized in that it is composed of a connecting portion for connecting between the supporting portions.

According to a sixth aspect of the present invention, in the slide device according to the fifth aspect, the bearing nut of the ball screw shaft or the guide which is the outermost side of the ball screw shaft and the guide rail which are juxtaposed to each other. A shield outside the rail slider of the rail, which has a groove for accommodating the extending portion of the protective cover, on at least one of the inside and outside of the extending support portion of the support bracket so as to allow movement of the support bracket. It is characterized by the provision of a plate.

According to a seventh aspect of the present invention, in the slide device according to the sixth aspect, the shielding plate and the extending portions at both ends of the protective cover are shared or partially removable so as to be shared. It is characterized by having done.

[0016]

According to the first aspect of the present invention, when the work fixed to the work table is cut or welded, it is dropped onto the protective cover that does not expand or contract even if cutting chips or spatters fall. However, since the ball screw shaft, the bearing nut, and other parts are protected, the protective cover is not damaged and the sliding parts are not damaged or worn for a long period of time, and accuracy is maintained.

According to the second aspect of the present invention, the protective cover is formed so as to cover the outermost side of the ball screw shaft and the guide rail that are arranged in parallel, so that the drive section and the rail section can be integrated with the protective cover. At the same time, cutting debris and spatter will fall onto the upper surface of the protective cover and its surroundings.

According to the invention of claim 3, since the screw shaft support bracket is fixed to the bearing nut in the axial direction of the ball screw shaft or in a direction orthogonal to the axial direction, the degree of freedom in design specifications is increased. .

According to the invention of claim 4, the protective cover is provided.
Consists of an upper surface part that covers the ball screw shaft and the guide rail that are juxtaposed, and extension parts that cover the sides on both sides, so that the upper surface part uses a flat plate and the extension part is an extruded material. It can be manufactured at low cost by sharing it with other manufacturers.

According to the invention of claim 5, since the support bracket is composed of the connecting portion and the extension supporting portion thereof, the extending supporting portion is shared by an extruded material or the like, and the connecting portion is formed. Since it can be used as a bar material, it can be manufactured at low cost.

According to the invention of claim 6, a shield plate for allowing the movement of the support bracket on at least one of the inside and outside of the extended support portion of the support bracket having the groove for accommodating the extended portion of the protective cover. By providing the above, it is possible to reliably prevent cutting dust and spatter from jumping into the sliding portion and the driving portion by the double wall of the shield plate and the extending portion of the protective cover.

According to the invention of claim 7, the number of the extruded parts can be reduced by sharing the shielding plate and the extending portion of the protective cover or by sharing a part of them so as to be removable. Can be cheaper. Further, since the height of the extruded component can be adjusted by breaking the notch groove at the tip of the extruded component, the same extruded component can be used according to the size of the slide device.

[0023]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to the drawings showing preferred embodiments.

1 and 2 are views showing an embodiment of the present invention.

In the figure, 10 is a slide device, which is mainly a base 11, a work table 1, a ball screw shaft 2, a bearing nut 3, a support bracket 4, and a protective cover 6.
And so on. The base 11 is formed as a base in this embodiment, and is rotatably supported by the ball screw shaft mounting bracket 5 at both ends of the ball screw shaft 2 on the base 11. A bearing nut 3 is screwed onto the ball screw shaft 2, and a support bracket 4 is attached via the bearing nut 3.

The ball screw shaft 2 is driven by connecting a shaft portion protruding from the ball screw shaft mounting bracket 5 at one end thereof to a motor 2a via a gear 2b. At least one guide rail 7 is provided in parallel with the ball screw shaft 2, and a rail slider 8 is slidably mounted on the guide rail 7. In this example, one guide rail 7 is provided on each side of the ball screw shaft 2, and the bearing nuts 3 and the rail sliders 8 of the guide rails 7 are connected to each other to move back and forth.

That is, the rotation of the ball screw shaft 2 causes the bearing nut 3 mounted on the ball screw shaft 2 to move back and forth, and the work table 1 is fixed to the support bracket 4 fixed to the bearing nut 3. The table 1 is moved back and forth in the axial direction of the ball screw shaft 2.

The support bracket 4 supports the work table 1 and is composed of extended support portions 4e at both ends which are fixed by screwing or the like and a connecting portion 4d which connects both extended support portions 4e. The coupling portion 4d is formed with a bearing nut mounting portion that is joined to the bearing nut 3 separately or integrally. In this example, the connecting portion 4d is the rail slider 8
The height can be reduced by further extending inward from above and connecting the connecting portion 4d to the lower side of the portion extending inward. The both extending support portions 4e having a complicated shape can be extruded aluminum and the connecting portion 4d can be a long material.

Support bracket 4 and work table 1
A space 4a for arranging the ball screw shaft 2, the bearing nut 3, the guide rail 7 and the protective cover 6 for protecting the rail slider 8 is provided between the and. This space 4a
The protective cover 6 is provided so as to allow the work table 1 to move back and forth.
Attached to.

The protective cover 6 is formed so as to cover the motor 2a up to the outermost side 4c of the ball screw shaft 2 and the guide rail 7 which are juxtaposed with each other. It is made up of an extension 6b. The upper surface portion 6a and the extending portion 6b may be integrated as shown in FIG. 1 or may be assembled separately as shown in a modified form in FIG.

When separated, the upper surface 6a may be a flat plate, and a thin steel or aluminum metal plate is used, and the extending part 6b is used.
The extruded profile material such as aluminum having an L-shaped cross section as shown in FIG. 5 is used.

The extending portion 6b of the protective cover 6 is provided to prevent cutting chips and spatter from entering from the sides of the ball screw shaft 2 and the guide rail 7 and to prevent the chips from bouncing back against the base 11. It extends to a place close to the base 11. Also, support bracket 4
Must support the worktable 1 outside the protective cover 6. Therefore, the support bracket 4 arranged on the upper surface of the bearing nut 3 of the ball screw shaft 2 and the rail slider 8 of the guide rail 7 allows the extended support portions 4e at both ends to accommodate the extended portions 6b of the protective cover 6, A deep groove 4b that does not interfere with the movement of the support bracket 4 is formed.

Shielding plate 9 along the guide rail 7 and the like over the entire length so as to allow movement of support bracket 4 on at least one of the inside and outside of extended support portions 4e on both sides of support bracket 4 having groove 4b. Is attached to the base 11.

In order to share the extending portion 6b formed separately from the shielding plate 9 and the protective cover 6, each of them has an L-shaped cross section, and as shown in FIG. 5, the mounting surface 9c and the shielding surface 9a are separated from each other. Is forming. A plurality of notch grooves 9b parallel to the mounting surface 9c are formed on the shielding surface 9a.
Fold and use according to the required height of a. This enables sharing.

The above is the ball screw shaft 2 and the guide rail 7.
Although the slide device 10 having and has been described,
The case of only the ball screw shaft 2 will be described with reference to FIGS. 3 and 4. FIG. 3 shows the bearing nut 3 from a direction different from (for example, orthogonal to) the axial direction of the ball screw shaft 2.
When the support bracket 4 is attached to the base 1 between the support bracket 4 and the work table 1.
The space 4a for arranging the protective cover 6 fixed to 1 is a substantially rectangular shape in which the bearing nut 3 is enclosed in the protective cover 6. The protective cover 6 is the same in that it is composed of an upper surface portion 6a that covers the upper side of the ball screw shaft 2 and an extending portion 6b that covers the lateral side of the same axis.

FIG. 4 shows a case where the support bracket 4 is attached to the bearing nut 3 in the axial direction of the ball screw shaft 2, and the bearing nut 3 is formed with a flange 3b. Therefore, unlike the space 4a in the case of FIG. 3, the space 4a has a shape in which the cross-sectional shape of the substantially protective cover 6 is installed. Others are the same as in FIG.

The result of the function confirmation experiment of the protective cover 6 of the slide device 10 having the above structure will be described.

In the slide device 10 shown in FIG. 1, the workpiece is fixed on the work table 1, and the drive motor 2a is rotated in the forward and reverse directions according to the program command of the machining position.
Welding work was performed while moving back and forth.

In this experiment, when Styrofoam (which is weak to heat and melts by welding spatter) was placed on the guide rail 7 part, the welding spatter descended from above and melting of the Styrofoam did not occur. Next, 4 toward the gap between the protective cover extension and the base.
When the welding spatter was skipped from the direction of 5 °, many spatters bounced off and hit the base, and melting was confirmed in some places. Subsequently, when the shield plate 9 was attached and an experiment was conducted under the same conditions, no melting of the Styrofoam was observed.

As described above, the entire surface is covered with the fixed cover, and the double protective cover 6 is provided with the shielding plate 9 in the gap, so that the protective cover 6 has a reliable function and exhibits a practically useful effect. It was confirmed that

[0041]

Since the present invention is configured as described above, it has the following effects.

According to the invention of claim 1, since the protective cover is provided with the upper surface portion and the extending portions so as to cover the ball screw shaft and the bearing nut at both end portions thereof, the shape of the protective cover is provided. However, the metal cover can be mounted in a state in which the support bracket is penetrated, and the ball screw shaft for driving can be completely protected even when exposed to high temperature. Further, since the protective cover has no movable portion, it is not scratched or cut, and the durability is improved.

According to the second aspect of the invention, since the protective cover is formed so as to cover up to the outermost side of the ball screw shaft and the guide rail arranged in parallel, the guide rail and the ball screw shaft are separately protected. What used to be a cover, the ball screw shaft located inside the outermost guide rail does not need a protective cover as a single unit, and can be covered with a protective cover integrated with the guide rail at the same time. it can.

According to the third aspect of the invention, the screw shaft support bracket can be fixed in the axial direction of the ball screw shaft or in the direction orthogonal to this axial direction. -Le screw shaft can be used. In addition, a protective cover can be easily attached in accordance therewith.

According to the invention of claim 4, the protective cover is provided.
Is divided into an upper surface portion and its extension portion, the upper surface portion uses a flat plate such as a steel plate, the extension portion is made of an extruded material of aluminum, and can be easily joined by screwing, etc. It is possible to reduce expensive aluminum extruded parts.

According to the fifth aspect of the present invention, when the support bracket is divided into the connecting portion and the extending supporting portion thereof, the expensive aluminum extruded portion is only the extending supporting portion, and the connecting portion is Since it can be a long material, it can be manufactured at low cost.

According to the sixth aspect of the present invention, since the shield plate is provided on at least one of the inside and outside of the support bracket extending support portion for accommodating the extending portion of the protective cover, the gap between the protective cover and the base is provided. It is possible to reliably prevent jumping of cutting dust or welding spatter that has passed through to the sliding portion or the driving portion.

According to the invention of claim 7, the shielding plate with the notch groove and the extending portion of the protective cover can be used in common, or a part thereof can be simply folded and cut without machining to be used for either. Therefore, the number of extruded parts can be reduced and the cost can be reduced.

[Brief description of drawings]

FIG. 1 is an exploded perspective view of a slide device showing an embodiment of the present invention.

FIG. 2 is a cross-sectional view of a main part of FIG.

FIG. 3 is a sectional view showing an example of a support bracket supporting a work table.

FIG. 4 is a cross-sectional view showing another example of a support bracket supporting a work table.

FIG. 5 is a perspective view of a main part of the shielding plate according to the embodiment of the present invention.

FIG. 6 is a perspective view showing a bellows type protection cover showing a conventional example.

FIG. 7 is a perspective view showing a slide-type protection cover showing a conventional example.

[Explanation of symbols]

 10… Sliding device 1 ・ ・ ・ Work table 2 ・ ・ ・ Ball screw shaft 3 ・ ・ ・ Bearing nut 4 ・ ・ ・ Support bracket 6 ・ ・ ・ Protective cover 7 ‥ Guide rail 8 ‥ Rail slider 9 ・ ・ ・ Shielding plate

Claims (7)

[Claims] 1. A ball screw shaft is driven to rotate so that the ball screw shaft is rotated.
The bearing nut mounted on the screw shaft,
A work table is fixed to a support bracket fixed to the bearing nut to move the work table back and forth in the axial direction of the ball screw shaft, and the ball screw shaft and the ball screw shaft are provided between the support bracket and the work table. A slide device, wherein a space for arranging a protective cover for protecting the bearing nut is provided, and the protective cover is provided in the space so as to allow the work table to move back and forth. 2. The ball screw shaft and the guide rail, wherein at least one guide rail is provided in parallel with the ball screw shaft, a rail slider is slidably provided on the guide rail, and the protective cover is arranged in parallel. The slide device according to claim 1, wherein the slide device is formed so as to cover the outermost part of the slide device. 3. The slide device according to claim 1, wherein the support bracket is fixed to the bearing nut from an axial direction of the ball screw shaft or a direction orthogonal to the axial direction. 4. The protective cover is composed of an upper surface portion that covers the ball screw shaft and the guide rail that are arranged in parallel, and extension portions that laterally cover both sides of the upper surface portion. The slide device according to claim 2. 5. The support bracket includes both extending support portions that pass through both extending portions of the protective cover, respectively.
The slide device according to claim 3, wherein the slide device includes a connecting portion that connects between the two extended support portions. 6. An extension portion of the protective cover, which is outside the bearing nut of the ball screw shaft or the rail slider of the guide rail, which is the outermost side of the ball screw shaft and the guide rail, which are juxtaposed to each other. The slide device according to claim 5, wherein a shield plate is provided on at least one of the inside and the outside of the extended support portion of the support bracket having a groove for receiving the shield plate so as to allow movement of the support bracket. 7. The slide device according to claim 6, wherein the shield plate and the extending portions at both ends of the protective cover are commonly used or partially removable so as to be commonly used.