JP2021074820A - Telescopic cover and wiper - Google Patents

Abstract

To provide a telescopic cover having a new structure by which it can be visually recognized reliably and easily that a wiper wears and exceeds a tolerance limit, and a wiper.SOLUTION: A wiper 16 is detachably attached to a tip 11g of each cover body of a telescopic cover, and a display 17, which represents wear tolerance limit, is provided in an area of a prescribed length range from the tip of the wiper. The display, for example, can be so made as to be a colored part which is colored with a color different from that of a wiper body, and is formed in an area of a length range of L2=L1 s (s is a safety factor<1) from the tip of the wiper when a wear length is represented by L1 when worn until spring force due to the tip of the wiper against an external surface of the lower cover body becomes null.SELECTED DRAWING: Figure 5

Description

The present invention relates to a telescopic cover that seals a fixed bed surface of a machine tool in which a moving mechanism slides on a fixed bed, and a wiper that is detachably attached to the tip of each cover body of the telescopic cover.

In a machine tool in which a moving mechanism driven by a servomotor and a ball screw slides on a fixed bed, if dust and chips generated by the operation accumulate on the fixed bed surface, the smooth operation of the moving mechanism is hindered. It may cause damage or wear to the moving mechanism.

In order to prevent this, a telescopic cover that seals the fixed bed surface is attached (Patent Documents 1 and 2). The telescopic cover is a cover in which a plurality of covers having substantially the same shape but gradually different dimensions are provided in a nested manner, with one end connected to a fixed bed and the other end connected to a moving mechanism. It is installed so as to cover the fixed bed surface, and expands or contracts while sliding on the fixed bed surface in conjunction with the sliding movement of the moving mechanism.

In such a telescopic cover, the tip of each cover body expands and contracts while sliding against the upper surface of another cover body adjacent to the inside thereof, but dust and chips may enter between them. A thin metal plate-shaped sealing material (wiper) is attached to the tip of each cover so that it can be attached and detached, and replaced with a new wiper when wear progresses due to long-term use and it becomes impossible to continue using it. (Patent Document 2).

Japanese Unexamined Patent Publication No. 6-9175 Japanese Unexamined Patent Publication No. 2013-255951

However, it is not easy to visually confirm that the wiper has worn out and exceeded the permissible limit, and often the wiper that exceeds the permissible limit is used as it is without replacement, resulting in dust and chips inside. In some cases, it invaded and interfered with the smooth operation of the moving mechanism.

Therefore, in view of the above background, the problem to be solved by the present invention is to provide a telescopic cover and a wiper having a new structure capable of surely and easily visually confirming that the wiper has worn out and exceeds the permissible limit. It is to be.

In order to solve this problem, the present invention according to claim 1 is a telescopic cover that seals a fixed bed surface of a machine tool in which a moving mechanism slides on a fixed bed, and a wiper can be attached to and detached from the tip of each cover body. It is attached and is characterized in that a display indicating a wear tolerance limit is provided in a region within a predetermined length range from the tip of the wiper.

The present invention according to claim 2 is characterized in that, in the telescopic cover according to claim 1, the indication indicating the wear tolerance limit is a colored portion colored in a color different from that of the wiper main body.

According to the third aspect of the present invention, in the telescopic cover according to the first or second aspect, when the wear length when the spring force due to the tip of the wiper with respect to the outer surface of the lower cover body is worn to zero is set to L. The display indicating the wear tolerance limit is formed in a region in the length range of L · s (s is a safety factor <1) from the initial tip of the wiper.

The present invention according to claim 4 is a wiper that is detachably attached to the tip of each cover body in the telescopic cover according to any one of claims 1 to 3.

According to the present invention, when the wiper is worn and deteriorated and exceeds the permissible limit, the operator visually confirms the display by coloring or the like applied to the tip of the wiper, and prompts the operator to replace the wiper with a new wiper. it can. As a result, it is possible to prevent the wiper that has deteriorated from being worn from being used continuously, and to prevent dust and chips from invading the inside and hindering the smooth sliding movement of the moving mechanism.

It is a side view of the extended state of the telescopic cover according to one Example of this invention. It is a plan view of the extended state of the telescopic cover. In this figure, only one side of the center line in the width direction is shown. It is a left end view of the telescopic cover. It is sectional drawing which shows the part A in FIG. 2 enlarged. In this figure, it is shown that a new wiper that is not worn is installed. It is an enlarged view which shows the part B of FIG. 4 further enlarged.

The telescopic cover and the wiper blade according to the embodiment of the present invention will be described with reference to FIGS. 1 to 5. In the telescopic cover 10 according to this embodiment, a plurality of cover bodies 11 (11a to 11f) having substantially the same shape but gradually different dimensions are provided in a nested manner so as to be expandable and contractible, and are arranged on the outermost side with the maximum dimensions. On the outside of the cover body 11a, a fixing side mounting flange 12 for fixing to the fixing bed 20 of the machine tool by an arbitrary means such as a bolt is attached, and the outside of the cover body 11f which has the minimum dimension and is arranged on the innermost side. A moving side mounting flange 13 for fixing by an arbitrary means such as a bolt is attached to a moving mechanism 21 driven by a servomotor and a ball screw or the like. The telescopic cover 10 expands or contracts while sliding along the fixed bed surface in conjunction with the sliding movement of the moving mechanism 21.

For expansion and contraction of the telescopic cover 10, a guide roller, a pantograph (for example, pantograph 6 of Patent Document 2) or the like is appropriately adopted in order to ensure smooth and stable operation over a long period of time, and these are directly applied to the means of the present invention. Since it is not related, the illustration and description are omitted.

As shown in FIG. 4, a wiper holder 14 is attached to the back surface side of the front end (moving mechanism side) of each cover body 11. The wiper holder 14 is welded to the back surface side of the front end of the cover body 11 at the rear portion thereof, and the front portion thereof is bent like a leaf spring.

Explaining in detail with reference to FIG. 4 and FIG. 5, there is a slight gap 15 between the inner and outer cover bodies (cover bodies 11c and 11d in FIG. 4), but the front plate of the wiper holder 14 The spring portion 14a is bent and formed in the gap 15, and the leading edge portion 14b thereof has an angle θ (for example, downward with respect to the main portion surface of the cover body 11) in which the tip end portion 11g of the cover body 11 is bent downward. It is tilted at approximately the same angle as (20 degrees), and is substantially in close contact with the inner surface of the tip portion 11g of the cover body. A wiper 16 formed of hardened thin steel plate or the like to have substantially the same shape as the front leaf spring portion 14a of the wiper holder is inserted between the tip end portion 11g of the cover body and the tip end portion 14b of the wiper holder and mounted. In this way, the wiper 16 can be easily attached to and detached from the wiper holder 14 by inserting and removing it.

In FIG. 4, it is shown that a new wiper 16 that is not worn is attached. At this time, since the wiper 16 protrudes forward by a sufficient length from the cover body tip 11g, the tip of the wiper 16 presses against the outer surface of the lower cover body 11d with a predetermined spring force and separates from the cover body tip 11g. It is in a state of being bent upward due to its elasticity from the point. This prevents dust and chips generated by the operation of the machine tool from entering the inside through the gap 15.

From this state, when the tip of the wiper 16 repeatedly slides while contacting the outer surface of the cover body 11d, it gradually wears and the upward bending angle at a point away from the cover body tip 11g becomes small. Become. Then, as shown by a virtual line in FIG. 5 as reference numeral 16', when the upward bending angle becomes zero and wears until it becomes the same as the inclination angle θ of the cover body tip portion 11g, the tip of the wiper 16 becomes the cover body. The spring force that presses against the outer surface of 11d becomes zero, and the permissible limit of the wiper 16 is reached. For example, assuming that the initial protrusion length of the wiper 16 to the tip is 5.6 mm and the protrusion length of the wiper 16'when the spring force becomes zero is 2.7 mm, L1 = 5.6-. The wiper 16 can be used until 2.7 = 2.9 mm wear.

However, since it is practically extremely difficult for an operator to visually confirm the allowable limit of the wiper 16, it is preferable to provide a display for facilitating this. In view of this viewpoint, in the present embodiment, the wiper tip corresponding to a numerical value (L1 · s, for example 1.6 mm) calculated by assuming a predetermined safety factor s at the wear limit (L1 = 2.9 mm) of the wiper 16. The region (length L2) is colored in a conspicuous color (red or the like) different from other parts (wiper main body) to indicate the wear tolerance limit display 17. The safety factor s is s <1, and for example, 0.5 ≦ s ≦ 0.8 can be set. This allows the operator to easily and reliably visually confirm that the wear tolerance indicator 17 at the tip of the wiper 16 is still usable and needs to be replaced when it is completely invisible. be able to. Therefore, the wiper that exceeds the permissible limit is used as it is without being replaced, and as a result, it is surely prevented that dust and chips enter the inside and interfere with the smooth operation of the moving mechanism. be able to.

Since FIG. 4 is an enlarged cross-sectional view of portion A in FIG. 2, the mounting state of the wiper 16 at the tip portion 11g of the cover body 11c and the positional relationship with the cover body 11d below the wiper 16 are shown. However, the attached state and positional relationship shown in the figure are the same for other cover bodies. In FIG. 4, reference numeral 18 is a back plate for attaching the guide roller, pantograph, etc. described above.

Although the present invention has been described in detail above based on the illustrated embodiments, the present invention is not limited to this, and can be variously modified or modified within the scope of the invention determined based on the description of the claims. It can be changed and implemented.

For example, in the illustrated embodiment, the wear tolerance limit display is provided in the range calculated in anticipation of a safety factor that is relatively large with respect to the wear limit of the wiper, but the safety factor can be any numerical value, or The wear tolerance limit display may be provided in the range until the wear limit of the wiper is reached without expecting the safety factor.

Further, in the illustrated embodiment, the area of the tip of the wiper in a predetermined range is colored in a conspicuous color different from that of the main body to indicate the wear tolerance limit. , Not limited to coloring, other display means may be adopted.

Further, in the illustrated embodiment, the wear tolerance limit display is provided in the region of the wiper tip in a predetermined range, but on the contrary, a conspicuous display is provided in the portion other than the wiper tip region (wiper main body), and the wear progresses. A display form for confirming that the wear tolerance limit has been reached when the display becomes visible may be adopted.

10 Telescopic cover 11 (11a to 11f) Cover body 11g Tip part of cover body 12 Fixed side mounting flange 13 Moving side mounting flange 14 Wiper holder 14a Front leaf spring part of wiper holder 14b Cutting edge part of wiper holder 15 Gap 16 Wiper 17 Wear tolerance limit display 18 Back plate

Claims (4)

In a telescopic cover that seals the fixed bed surface of a machine tool in which a moving mechanism slides on a fixed bed, a wiper is detachably attached to the tip of each cover body, and a wiper is detachably attached to a region within a predetermined length range from the tip of the wiper. A telescopic cover characterized by being provided with an indication indicating the wear tolerance limit. The telescopic cover according to claim 1, wherein the display indicating the wear tolerance limit is a colored portion colored in a color different from that of the wiper main body. When the wear length when worn until the spring force by the wiper tip with respect to the outer surface of the lower cover body becomes zero is L1, the display indicating the wear tolerance limit is L2 = L1 · s from the initial wiper tip. The telescopic cover according to claim 1 or 2, wherein (s) is formed in a region of the length range of the safety factor <1). A wiper that is detachably attached to the tip of each cover in the telescopic cover according to any one of claims 1 to 3.

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