JP3326104B2 - Sliding surface protection device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sliding surface protection device which expands and contracts with movement of a table of a machine tool and protects the sliding surface of the table from chips, dust and the like.

[0002]

2. Description of the Related Art Conventionally, as a sliding surface protection device, the present applicant has proposed a device disclosed in Japanese Patent Application Laid-Open No. Hei 8-25169. As shown in FIG. 6, the sliding surface protection device 1 has a plurality of movable covers 2 and 2 connected to each other so as to be extendable and contractible. Each of the movable covers 2, 2 is composed of slide members 3, 3 and partition plates 5, 5 joined and fixed to the front surfaces of mounting plates 4, 4 which are curved downward at the distal end surfaces of the slide members 3, 3. I have. Wipers 6, 6 are attached to the ends of the slide bodies 3, 3 by connecting pieces 7, 7, respectively.
Elastic body extension side restricting portions 8 are provided on an outer peripheral portion of the elastic member 5, and contraction side regulating portions 9
Is provided. Then, the impacts at the time of contact between the movable covers 2 and 2 are reduced by the regulating portions 8 and 9, so that the generation of contact noise and vibration at the time of contact between the movable covers 2 and 2 are suppressed.

[0003]

However, in the above-mentioned conventional sliding surface protection device, the following problems have occurred with the recent increase in the expansion / contraction speed.

[0004] When the movable covers 2 and 2 are extended, when the connecting pieces 7 and 7 collide with the rubber-side extension-side restricting portions 8 and 8, they generate an impact sound and vibrate. Further, when the movable covers 2 and 2 are contracted, the partition plate 5 of the movable cover 2 collides against the rubber-side contraction-side restricting portions 9 and 9 to generate an impact sound and vibrate the cover.

An object of the present invention is to provide a sliding surface protection device which can solve the above-mentioned problems of the prior art and can suppress noise and vibration when the movable cover is extended and contracted.

[0006]

According to the first aspect of the present invention,
In a sliding surface protection device in which a fixed cover that covers a sliding surface of a machine tool and a plurality of movable covers are respectively elastically connected, when the movable cover is extended between the fixed cover, the movable cover, and the movable cover. Alternatively, at the final stage of contraction, a noise and vibration mitigation mechanism that reduces noise and vibration generated between the fixed cover and the movable cover and the movable cover is attached, and the mitigation mechanism expands and contracts the movable cover in a no-load state. An elastic body that is compressed by at least 10% of the stroke length is provided.

[0007]

[0008] Then, the movable cover is constituted a cover body attached to seal member at one end, by a partition plate which is fixed in a direction perpendicular to the cover main body to the other end of the cover body, the noise and vibration mitigation The mechanism has one end connected to the partition of the movable cover located on the outside, and a spring guide rod extending through the partition of the movable cover located on the middle in the middle and extending in the direction of expansion and contraction of the movable cover. A first coil spring which is guided and supported by the spring guide rod between a stopper attached to an end and the partition plate of the movable cover located inside, and is compressed when the movable cover is extended;
A second coil spring is supported between the inner and outer partition plates by the guide rod and is compressed when the movable cover contracts.

According to a second aspect of the present invention, in the first aspect , a buffer member, which also serves as a spring receiver, made of an elastic material is fitted to a portion of the inner partition plate that penetrates the spring guide rod. The spring guide rod passes through a through hole of the member.

According to a third aspect of the present invention, in the first aspect , after the coil spring operates when the movable cover is extended, a cushioning member is further provided to reduce an impact between the movable covers.

According to a fourth aspect of the present invention, in the first aspect , after the coil spring is actuated when the movable cover is contracted, a cushioning member is further provided to reduce an impact between the movable covers.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to FIGS. As shown in FIG. 1, a sliding surface protection device 12 is mounted on a mounting plate 11 mounted on a fixed body such as a bed of a machine tool. The sliding surface protection device 12 includes a fixed cover 13 fixed to the mounting plate 11 and the fixed cover 13.
A first movable cover 14 attached to the outside of the device and capable of reciprocating in the front-rear direction (right and left directions in FIG. 1);
And a second movable cover 15 that can be reciprocated in the front-rear direction. Similarly, this sliding surface protection device 1
Reference numeral 2 denotes a third movable cover 16 mounted on the outside of the second movable cover 15 and reciprocates in the front-rear direction, and a fourth movable cover mounted on the outside of the third movable cover 16 and reciprocates in the front-rear direction. 17 are provided.

The fixed cover 13 is provided on the mounting plate 1.
1 includes a fixed cover main body 18 fixed by welding or the like and a fixed partition plate 19 fixed to the front end (the right end in FIG. 1) of the fixed cover main body 18 by welding or the like.
The first to fourth movable covers 14 to 17 are
Fourth movable cover bodies 21 to 24 and each cover body 21
1st to 24th front ends fixed by welding or the like, respectively.
To the fourth movable partition plates 25 to 28.

The first to fourth movable cover bodies 21 and 2
4, inside the rear end portion, adjacent cover bodies 18, 21,
A seal member 29 for maintaining the sealing property with the seals 22 and 23 is attached. The sealing member 29 is composed of a connecting piece 29a shown in FIG. 4 and a sealing piece 29b fitted to the connecting piece 29a. As a material of the seal piece 29b, there is, for example, rubber or resin.

The upper edges of the fixed partition 19 and the first to third movable partitions 25, 26, 27 are
Projections slightly higher than 1, 22, 23
An extension-side restricting portion 30 is attached to the rear side surface of the projecting portions of 9, 25, 26, and 27 so as to correspond to the seal piece 29b. Then, at the final stage in which the movable covers 14 to 17 extend, the seal pieces 29b come into contact with each other to reduce the impact noise and vibration at the time of the contact. For example, rubber or resin is used as the material of the extension-side regulating portion 30.

The fixed partition plate 19 of the fixed cover 13 and the first
A first noise / vibration damping mechanism 31 is mounted between the movable cover 14 and the first movable partition 25. Also, the movable partition plates 25 and 2 of the first movable cover 14 and the second movable cover 15 are provided.
6 is provided with a second noise / vibration damping mechanism 32.
Similarly, the second movable cover 15 and the third movable cover 16
The third noise / vibration damping mechanism 33 and the fourth noise / vibration damping mechanism 34 are also mounted between the third movable cover 16 and the fourth movable cover 17.

The first to fourth noise / vibration damping mechanisms 3
1, 32, 33, and 34 have the same configuration. Therefore, the configuration of the first noise / vibration damping mechanism 31 will be described mainly with reference to FIGS.

A male screw portion 35a having a diameter smaller than that of the first spring guide rod 35 formed at the front end of the first spring guide rod 35 passes through the mounting hole 25a of the first movable partition plate 25 of the first movable cover 14, and the male screw portion 35a is formed. , A nut 39 is screwed therein, and the rod 35 is fastened and fixed to the first movable partition plate 25.
The first spring guide rod 35 extends rearward through a mounting hole 19a formed in the fixed partition plate 19 of the fixed cover 13, and a stopper 40 serving also as a spring receiver is attached to the rear end of the guide rod 35. ing. A first coil spring 41 is mounted near the stopper 40 so as to surround the first spring guide rod 35. The first movable cover 14 shown in FIGS.
In the final stage of transition from the contracted state to the extended state shown in FIGS. 2 and 5, noise and vibration due to collision between the fixed cover 13 and the first movable cover 14 are attenuated.

A second coil spring 42 is wound around the guide rod 35 so as to be located between the fixed partition 19 and the first movable partition 25. This second coil spring 4
2 is a noise and vibration generated when the first movable cover 14 collides with the fixed cover 13 in the final stage in which the first movable cover 14 shown in FIGS. Absorb. The buffer member 43 is attached to the fixed partition 19 of the fixed cover 13. The cushioning member 43 is made of, for example, rubber or resin, and has a guide hole 43a formed at the center thereof for slidingly guiding the rod 35, and an annular engaging groove 43b formed on the outer periphery.
The buffer member 43 is engaged with the hole 19a of the fixed partition plate 19 by the engagement groove 43b. The flange-shaped portions located before and after the buffer member 43 are buffer portions 43c, 43c. When the first movable cover 14 is extended, the front end of the first coil spring 41 is supported by the rear buffer portion 43c. When the first movable cover 14 is contracted, the rear end of the second coil spring 42 is supported by the front buffer portion 43c. A rubber buffer plate 44 is fitted to the front end of the spring guide rod 35 so as to contact the rear side surface of the first movable partition plate 25, and supports the front end of the second coil spring 42.

A contraction side restricting portion 45 made of rubber is fixed to the front surface of the fixed partition plate 19 by bolts and nuts (not shown). The buffer member 45 supports the rear side surface of the movable partition plate 25 of the first movable cover 14 at the final stage of contraction of the first movable cover 14 to attenuate noise and vibration due to collision.

The fourth movable cover 17 has a bracket 4
The bracket 46 connects the table of the machine tool (not shown) to the movable cover 17. Next, the operation of the sliding surface protection device 12 configured as described above will be described.

FIG. 1 shows first to fourth movable covers 14 to 17.
Are contracted toward the fixed cover 13. In this contracted state, when the table is guided by the sliding surface and moves forward, the movable covers 14 to 17 are extended forward. When approaching the final stage of this extension operation, the first to fourth noises
The front ends of the first coil springs 41 to 41 of the vibration damping mechanisms 31 to 34 hit the fixed partition 19 and the buffer 43 c on the rear side of the movable partition 25, 26, 27, after which the springs 41 to 41 are compressed and each cover is compressed. Separators 19, 25, 26, 27, 28
Noise and vibration due to mutual collision are attenuated. The compression operation of the spring 41 is performed for a length of about 0 to 60% of the length of the unloaded state. Further, as shown in FIG.
When 9b hits the extension side regulating portion 30, the extension operation of the first to fourth movable covers 14 to 17 ends. Also at this time, noise and vibration are attenuated.

On the contrary, the movable covers 14 to 17 shown in FIG.
In the final stage of transition from the extended state to the contracted state shown in FIG. 1, the rear ends of the second coil springs 42 to 42 of the first to fourth noise / vibration damping mechanisms 31 to 34 are fixed to the fixed partition plate 19 and the movable partition. It hits the buffer 43c on the front side of the plates 25, 26, 27,
Thereafter, the springs 42 to 42 are compressed, and the diaphragm 1 of each cover is compressed.
9, 25, 26, 27, 28 Noise and vibration due to mutual collision are attenuated. The compression operation of the springs 42 to 42 is performed for a length of about 0 to 60% of the length of the unloaded state. Further, in FIG. 1, when the partition walls 25, 26, 27, and 28 hit the contraction side regulating portion 45, the first to fourth movable covers 14
The expansion operation of Nos. To 17 ends. Also at this time, noise and vibration are attenuated.

In this embodiment, assuming that the total length of the first coil spring 41 in the unloaded state is L, the spring 41 is compressed by L / 2 when the first movable cover 14 is extended, that is, the first coil spring 41 41 is the movable cover 14
Of the minimum elongation force required to elongate
The sealing piece 29b comes into contact with the extension-side regulating portion 30 in a state where the elastic force is doubled and the noise and the vibration are sufficiently attenuated by the spring 41. Similarly, assuming that the entire length of the second coil spring 42 in the no-load state is L, the spring 42 is compressed by L / 2 when the movable cover 14 is contracted, that is, the second spring 42 contracts the movable cover 14. The first movable diaphragm 25 is brought into contact with the contraction-side regulating portion 45 in a state where the elastic force becomes, for example, 1.5 times the required minimum contraction force and the noise and vibration are sufficiently attenuated by the spring 42. ing.

The ratio of the compressed length to the total length L of the coil springs 41 and 42 in the no-load state is, for example, 10%, 20%, 30%, etc.
It is appropriately selected such as 40%. In addition, the coil springs 41 and 42 are movable covers 14 to 1 in a no-load state.
7 at least one of the extension or contraction distance (stroke length)
The length is set so that the length is compressed. For example, when the stroke of the movable covers 14 to 17 is 500 mm, the total length L of the coil springs 41 and 42 is set to, for example, 100 mm so as to be compressed by 50 mm.
The ratio of the compressed length to the total length L is determined by the coil spring 4
By increasing the total length L of 1, 42, it is possible to make it nearly zero.

Next, the effects of the sliding surface protection device 12 configured as described above will be listed together with the configuration. In the above embodiment, the first to fourth noise / vibration damping mechanisms 31 to 34 are mounted between the fixed cover 13 and the first to fourth movable covers 14 to 17, respectively. Since the coil springs are compressed by at least 10% of the length of the 17 expansion / contraction strokes, it is possible to attenuate collision sounds and vibrations when the movable covers 14 to 17 extend or contract.

In the above embodiment, the first movable partition 25
A stopper 40 is provided at the rear end of the guide rod 35 through the guide hole 43a of the buffering member 43 supported at the fixed partition plate 19 at the middle of the spring guide rod 35 having one end fixed to the stopper 40. Attach one coil spring 41,
The second partition is located between the fixed partition 19 and the movable partition 25.
First noise and vibration damping mechanism 3 with coil spring 42 interposed
1 has the following effects.

That is, in the final stage in which the first movable cover 14 extends, the first coil spring 41 is
And the coil spring 41 is compressed as the movable cover 14 moves forward.
The impact sound and the vibration in the final stage of the extension operation of the movable cover 14 can be effectively attenuated. Further, in the final stage in which the movable cover 14 contracts by the action of the second coil spring 42, noise and vibration caused by the collision of the movable cover 14 with the fixed cover 13 are effectively attenuated.

In the above-described embodiment, since the extension-side regulating portion 30 and the contraction-side regulating portion 45 are provided, the movable cover 1
In the final stage of the extension operation or the contraction operation of No. 4, noise and vibration can be further effectively attenuated.

In the above embodiment, the fixed diaphragm 19
And a cushioning member 43 is provided on the movable partition plates 25, 26, 27,
The guide rod 35 is inserted into the guide hole 43a of the buffer member 43.
, The spring guide rod 35 can smoothly reciprocate in the front-rear direction.

The present invention is not limited to the above embodiment, but can be embodied as follows .

In the above embodiment, the innermost cover is a fixed cover, but the outermost cover may be a fixed cover and the innermost cover may be attached to a table. The extension side restricting portion 30, the buffer member 43, and the buffer plate 44.
And omitting at least one of the contraction side regulating portions 45.

The ratio of the compression length or the extension length to the total length L of the coil springs 41, 42 when no load is applied is set in the range of 10% to 60%, 20% to 60%, 30% to 60% or 40%. Appropriately select within the range of ~ 60%.

In this specification, the fixed cover also means a cover attached to a movable member such as a movable table of a machine tool.

[0035]

As described above in detail, the first aspect of the present invention has the effect of suppressing noise and vibration when the movable cover is extended and contracted.

Further, it is possible to stabilize the operation of the noise and vibration absorbing mechanism.

The invention according to claim 2, in addition to the effect of the first aspect, it is possible to smoothly perform the operation of the spring guide rod. The invention according to claim 3 or 4 is the invention
In addition to the effects of the invention described in 1 above, noise and vibration during extension and contraction of the movable cover can be further attenuated.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view of a sliding surface protection device according to an embodiment of the present invention in a contracted state.

FIG. 2 is a sectional view showing an extended state of the sliding surface protection device.

FIG. 3 is a front view of the sliding surface protection device.

FIG. 4 is an enlarged sectional view of a contracted state showing a noise / vibration damping mechanism which is a main part of the sliding surface protection device.

FIG. 5 is an enlarged cross-sectional view showing a noise / vibration damping mechanism which is a main part of the sliding surface protection device in an extended state.

FIG. 6 is a sectional view of a conventional sliding surface protection device in a contracted state.

[Description of Signs] 12 ... Sliding surface protection device, 13 ... Fixed cover, 14-17
... first to fourth movable covers, 18 ... fixed cover body, 1
Reference numeral 9: fixed partition, 21 to 24: first to fourth movable cover main bodies, 25 to 26: first to fourth movable partition, 30 ... extension side regulating portion, 31 to 34: first to fourth Noise-vibration damping mechanism, 35 to 38 ... first to fourth spring guide rods, 40
... Stoppers, 41, 42 ... First and second coil springs, 4
3. Buffer member, 44 Buffer plate, 45 Contraction side regulating portion.

Claims (4)

(57) [Claims] 1. A sliding surface protection device in which a fixed cover covering a sliding surface of a machine tool or the like and a plurality of movable covers are connected to each other so as to be extendable and contractible. At the final stage when the movable cover is extended or contracted, install a noise / vibration mitigation mechanism to reduce noise and vibration generated between the fixed cover and the movable cover and the movable cover,
The relief mechanism includes an elastic body that is compressed by at least 10% of the length of the expansion / contraction stroke of the movable cover in a no-load state , and the movable cover has a seal member attached at one end.
A cover body, and the cover body at the other end of the cover body.
And a diaphragm fixed in a direction orthogonal to
The noise / vibration mitigation mechanism has a movable cover with one end located outside.
Of the movable cover located in the middle
Spring guy that extends through the diaphragm and extends in the direction of expansion and contraction of the movable cover
Rod and a strike attached to the inner end of the spring guide rod.
Between the upper cover and the partition plate of the movable cover located inside.
And is supported by the spring guide rod and has a movable cover.
A first coil spring compressed at the time of elongation,
Are guided and supported by the guide rod between the
A second coil spring that is compressed when the movable cover is contracted.
Sliding surface protection apparatus characterized by being constituted by. 2. The front of the inner partition according to claim 1, wherein:
The part passing through the spring guide rod is made of elastic material
A buffer member also serving as a spring receiver is fitted, and
A sliding surface protection device in which the spring guide rod is penetrated in a through hole . 3. The extension of the movable cover according to claim 1 , wherein
After the coil spring operates for a long time, and further between the movable cover
Sliding surface protection device provided with a cushioning member for reducing the impact of the sliding. 4. The movable cover according to claim 1 , wherein
After the coil spring has been activated during compression,
Sliding surface protection device provided with a cushioning member for reducing the impact of the sliding.