KR100818595B1 - Rotary joint for spindle of construction machine - Google Patents

Abstract

A rotary joint used for a spindle of a machine tool is provided to prevent leak of fluid by making the top portion of a casing retainer sharp contact closely with a spindle retainer, and to assemble the retainer to a casing easily and surely by allowing the casing retainer move in the axial direction without rotation. A rotary joint used for a spindle of a machine tool includes a casing(110) fixed to a housing of a machine tool, a casing retainer(120) movable in the axial direction without rotation, an O-ring(140) seated on a groove provided at inner side of the casing to seal the outer surface of the casing retainer and the inner surface of the casing, a non-rotational seal member(150) seated on the lower part of the casing retainer, a cover(160) installed at the lower part of the casing, an elastic member(170) supported one end by the casing retainer and the other end by the cover, a spindle retainer(180) assembled at the upper part of a spindle rotating at high speed, a rotational seal member(190) fixed to the upper portion of the spindle retainer to make contact with or separate from the non-rotational seal member, a tube(111) at lower portion of the casing where the casing retainer fits, a cover fixture(112) to secure the cover at an end of the tube, and a retainer guide(113) caulked to stick out in the axial direction with a certain angle to guide a groove formed on the outer surface of the casing retainer.

Description

ROTARY JOINT FOR SPINDLE OF CONSTRUCTION MACHINE}

1 is a longitudinal cross-sectional view of a casing side retainer and a spindle retainer in a rotary joint for a spindle of a machine tool according to an embodiment of the present invention;

2 is a cross-sectional view taken along the line A-A of FIG.

Figure 3 is a longitudinal sectional view of the casing side retainer and the spindle retainer in close contact with the rotary joint for the spindle of the machine tool according to an embodiment of the present invention,

Figure 4 is a longitudinal cross-sectional view of the casing side retainer and spindle retainer in the rotary joint for the spindle of the machine tool according to the prior art,

5 is a plan view of FIG. 4;

6 is a bottom view of FIG. 4,

Figure 7 is a longitudinal sectional view of the casing side retainer and the spindle retainer in close contact with the rotary joint for the spindle of the machine tool according to the prior art.

<Description of the symbols for the main parts of the drawings>

1 housing 2 spindle

100: rotary joint for spindle of machine tool

110: casing 111: tube

112: cover fixing part 113: retainer guide part

114: cover seating portion 120: casing retainer

121: groove 122: resistance surface

123: through hole 124: stepped surface

140: O-ring 150: non-rotating seal member

160: cover 170: bullet member

180: spindle retainer 190: rotating seal member

The present invention relates to a rotary joint for a spindle of a machine tool, and more particularly, to a rotary joint for a spindle of a machine tool that has a long life as well as an improved working efficiency during operation of the machine tool.

Rotary joints are generally used in high speed drilling and boring transfer operations, high speed machine tool spindles, and in other applications where it is necessary to transfer a fluid medium to a rotating device. In order to optimize the operation of high speed machine tools, rotary joints are required to supply liquids such as aqueous or oil-based coolants, and dry bodies such as air from a particular coolant source to the rotary machine tool side. One such field of rotary joints is the supply of liquids such as coolants and lubricants to rotary machine tools and the continuous supply of air to rotary machine tools for cleaning machine tools or work areas. Another area of rotary joints involves high-speed machining of specially heat treated steels, which can heat up the cutting tool and provide thermal shock to the cutting tool when water or oil-based coolants are supplied. In this case, an air coolant must be used to cool the cutting tool. The third field of rotary joints relates to the processing of medical devices, which, when lubricating medium comes into contact with these devices, makes the final product unsuitable for use.

As shown in FIGS. 4 to 7, the rotary rotary joint 10 for the spindle of the conventional machine tool has a casing 11 fixed to the housing 1 of the machine tool, and is not rotated by being inserted in the axial direction of the casing. And a casing retainer 12 which can be moved only in the axial direction, a pair of guide pins 13 which are inserted in the axial direction of the casing but the casing retainer 12 does not rotate, and an inner circumferential surface of the casing 11. O-ring 14 and lower portion of the casing retainer 12 is installed so as to seal between the inner circumferential surface of the casing 11 and the inner circumferential surface of the casing retainer 12 to be seated on the outer circumferential surface of the casing retainer 12 A non-rotating seal member 15 seated on the cover 16, a cover 16 press-fitted in a state of receiving the casing retainer 12 and the guide pin 13 in the lower portion of the casing 11, and the casing retainer ( 12) of An elastic member 17 having one end supported and the other end supported by the cover 16, a spindle retainer 18 fastened to an upper portion of the spindle 2 rotating at a high speed in the lower portion, and fixed to an upper portion of the spindle retainer. The non-rotating seal member is made of a rotating seal member 19 to be in close contact with and separated.

The casing 11 is provided with a plurality of holes 11a for fixing to the housing 1 and a fastening surface 11b for fastening a fluid supply pipe (not shown) with the female screw 11c formed at the center of the shaft.

Therefore, when the fluid is supplied to the hole formed through the shaft center of the casing 11, the fluid is supplied to the hole formed through the shaft center of the casing retainer 12 and the non-rotating seal member 15, and the casing retainer ( 12) when the non-rotational seal member 15 and the rotational seal member 19 are in close contact with each other, fluid is supplied to the spindle 2 through the spindle retainer 18 and sent to the cutting tool.

However, this structure is first supplied at a small pressure when the fluid is supplied to the casing retainer 12 through the casing 11, the fluid is supplied while maintaining a high pressure, the first supplied fluid is the non-rotating seal member The fluid is leaked between the non-rotating seal member 15 and the rotating seal member 19 by entering the through hole of the casing retainer 12 without contacting the rotating seal member 19 so that the work can be performed in the workplace. In view of this, the fluid was supplied while the casing litter inner 12 was pressed downward before supplying the fluid during the operation. However, since the manual operation was performed, this is a manual operation. There is also a problem that the fluid leaks.

In the case of the structure that prevents the rotation of the casing retainer 12 by the guide pin 13, there is a problem that is difficult to apply when it is difficult to secure a space for installing the guide pin 13.

The present invention has been made in order to solve the above problems, and the upper portion of the casing retainer is pointed, so that the casing retainer in the casing to the spindle retainer even by a small initial pressure to supply the fluid because the resistance surface of the fluid is wide It is a first object to provide a rotary joint for a spindle of a machine tool that is in close contact so that no fluid leakage occurs.

According to the present invention, the casing retainer is configured so that the casing retainer can move in the axial direction and does not rotate, and thus the casing retainer can be easily assembled even in a small diameter casing, and the assembly stability is excellent. A second purpose is to provide a rotary joint for a spindle.

The rotary joint for the spindle of the machine tool according to the present invention for achieving the above object, and the casing is fixed to the housing of the machine tool, it is inserted in the axial direction of the casing to be able to move only in the axial direction without rotation An O-ring installed between the inner circumferential surface of the casing retainer and the outer circumferential surface of the casing retainer in the form of a casing retainer, seated on an inner circumferential surface of the casing retainer, and a non-rotating seal member seated on the lower portion of the casing retainer; A cover fitted to the lower portion of the casing, a ballistic member having one end supported by the casing retainer and the other end supported by the cover, a spindle retainer fastened to the upper spindle rotating at a high speed to the lower portion of the spindle retainer, It is fixed to the upper portion is in close contact with the non-rotating seal member Including, but such that the rotated seal member, it has a surface resistance of the upper portion of the casing, the retainer configured to be sharp fluid.

The rotary joint for the spindle of the machine tool according to the present invention has a width of the through hole and the resistance surface within 1 mm so as not to be sharp in the axial through hole portion formed in the upper portion of the casing retainer in order to maximize the resistance surface. Characterized in that the inclined configuration.

The rotary joint for a spindle of a machine tool according to the present invention is characterized in that the inclined resistance surface meets the stepped surface in the central axis direction from the outer circumferential surface of the casing retainer.

The rotary joint for a spindle of a machine tool according to the present invention includes a casing fixed to a housing of a machine tool, a casing retainer fitted in the axial direction of the casing so as to be able to move only in the axial direction without rotation, and an inner circumferential surface of the casing. An O-ring installed on the outer circumferential surface of the casing retainer and seated on the outer circumferential surface of the casing retainer, the non-rotating seal member seated on the lower portion of the casing retainer, and the lower part of the casing retainer; A cover, an elastic member whose one end is supported by the casing retainer and the other end is supported by the cover, a spindle retainer fastened to the upper spindle which rotates at a high speed in the lower part, and fixed to the upper part of the spindle retainer, the non-rotating seal Including a rotating seal member to be in close contact with the member The lower part of the casing to which the casing retainer is fitted is formed in a tube length of a predetermined length, and the cover fixing portion is formed at the end of the tube portion to cover the cover so that the cover does not fall out so that the cover is seated and fixed. The retainer guide portion cocked to protrude in the axial direction is formed in the retainer guide portion to guide the groove formed on the outer peripheral surface of the casing retainer.

The rotary joint for the spindle of the machine tool according to the present invention is characterized in that the pipe portion is formed with a stepped cover seating portion to accurately seat the position of the cover.

The rotary joint for a spindle of a machine tool according to the present invention is characterized in that at least one through-hole is formed in the pipe portion in the axial direction.

Hereinafter, with reference to the accompanying drawings will be described in detail the configuration and operation of the rotary joint for the spindle of the machine tool according to an embodiment of the present invention.

1 is a longitudinal cross-sectional view of a casing side retainer and a spindle retainer in a rotary joint for a spindle of a machine tool according to an embodiment of the present invention, FIG. 2 is a cross-sectional view taken along line A-A of FIG. In the rotary joint for the spindle of the machine tool according to an embodiment of the present invention is a longitudinal sectional view of the casing side retainer and the spindle retainer in close contact.

Spindle rotary joint 100 of the machine tool of the present invention, the casing 110 is fixed to supply the fluid to the housing 1 of the machine tool, and the axial direction of the casing is inserted in the axial direction without rotation The inner circumferential surface of the casing 110 and the outer circumferential surface of the casing retainer 120 in a form that is fitted to the outer circumferential surface of the casing retainer 120 is seated on the inner circumferential surface of the casing 110 and the casing retainer 120 to move only; O-ring 140 installed to seal between the non-rotating seal member 150 seated on the lower portion of the casing retainer 120, the cover 160 fitted to the lower portion of the casing 110, and the casing retainer ( One end is supported by the 120 and the other end is supported by the cover 160, the elastic member 170, the spindle retainer 180 is fastened to the upper portion of the spindle (2) rotates at high speed in the lower portion of the spindle retainer Fixed to the top Air is the non-rotating seal member and the contact and separation to occur is composed of a rotating seal member 190.

Accordingly, the fluid supplied to the casing 110 flows in the axial center direction of the casing retainer 120 to allow the spindle 2 to pass through the non-rotating seal member 150, the rotating seal member 190, and the spindle retainer 180. ) Will be supplied. At this time, if the fluid is not supplied to the casing 110, the non-rotating seal member 150 is slightly raised to prevent the friction with the rotating seal member 190.

The main part of the present invention is that the upper surface of the casing retainer 120 has a resistive surface 122 of the fluid configured.

Where the inner circumferential surface of the through hole 123 and the resistance surface 122 start so that the portion of the through hole 123 formed in the upper portion of the casing retainer 120 is not sharp to widen the resistance surface 122 as much as possible. It is configured to be inclined downward with the width to the outer circumferential surface within 1 mm.

Therefore, when the fluid is spread and supplied due to the low pressure at the initial stage when the fluid is supplied to the casing 110, the casing retainer 120 is lowered by being applied to the resistance surface 122 from the initial fluid by the resistance surface 122. The non-rotational seal member 150 and the rotational seal member 190 are in close contact with each other and are supplied downward. That is, it is possible to prevent the fluid from entering and leaking into the non-rotating seal member 150 and the rotating seal member 190 so as not to enter the through hole 123 of the casing retainer 120 to be described later.

In addition, the inclined resistance surface 122 is to meet the surface 124 stepped in the direction of the central axis from the outer peripheral surface of the casing retainer 120.

Therefore, the force exerted by the fluid by the stepped surface 124 is further increased compared to the resistance surface 122 is made of only the inclined surface.

As described above, according to the present invention, the resistance surface of the fluid is wide, so that the casing retainer in the casing is in close contact with the spindle retainer even by the initial low pressure supplied with the fluid so that the fluid does not leak.

Meanwhile, the rotary joint for the spindle of the machine tool according to another embodiment of the present invention has a casing 110 fixed to supply fluid to the housing 1 of the machine tool, as shown in FIGS. The casing retainer 120 is inserted in the axial direction of the casing to move only in the axial direction without rotation, and the casing retainer 120 is seated on the inner circumferential surface of the casing 110 and fitted to the outer circumferential surface of the casing retainer 120. An O-ring 140 installed between the inner circumferential surface of the casing 110 and the outer circumferential surface of the casing retainer 120, a non-rotating seal member 150 seated on the lower portion of the casing retainer 120, and the casing 110. The cover 160 is inserted into the lower portion of the upper portion, the elastic member 170, one end of which is supported by the casing retainer 120 and the other end is supported by the cover 160, and the upper portion of the spindle 2 to rotate at high speed Fastener A spindle retainer 180 and a rotating seal member 190 fixed to an upper portion of the spindle retainer to be in close contact with and separate from the non-rotating seal member, wherein the casing retainer 120 is inserted into the casing 110. The lower part of the cover tube is formed in a predetermined length in the state of a thin tube 111, the cover fixing portion 112 for wrapping the cover 160 so that the cover 160 is seated and fixed to the end of the tube portion 111 is fixed. And a retainer guide portion 113 cocked to protrude in the axial direction at a predetermined angle is formed in the pipe portion 111 so that the retainer guide portion 113 is formed on the outer circumferential surface of the casing retainer 120. Characterized in that it is to guide.

Therefore, the groove 121 of the casing retainer 120 is guided up and down by the retainer guide part 113 formed in the pipe part 111. In this case, the retainer guide part 113 is formed parallel to a predetermined angle so that the casing retainer 120 is not twisted, and thus the wear life does not occur and the life is long.

Here, the stepped cover seating part 114 is formed in the pipe part 111 to accurately seat the position of the cover 160.

Therefore, since the cover 160 is installed in the correct position, the casing retainer 120 is smoothly operated, and thus, the friction and disadvantage of the non-rotating seal member 150 and the rotating seal member 190 are disadvantageous. Smooth operation ensures long life.

At least one through-hole 111a formed in the axial direction is formed in the pipe part 111.

As described above, the present invention can control the rotation of the casing retainer 120 by forming the pipe part 111 and the retainer guide part 113 in the casing 110, so that the casing side retainer can be assembled even in a small diameter casing. Easy to use, excellent assembly stability, long life.

As described above, according to the rotary joint for the spindle of the machine tool of the present invention, the upper surface of the casing retainer is pointed to widen the resistance surface of the fluid, so that the casing retainer in the casing adheres to the spindle retainer even at the initial low pressure when the fluid is supplied. This has the effect that the leakage of the fluid does not occur.

In addition, according to the rotary joint for the spindle of the machine tool of the present invention, the casing retainer is configured so that the casing retainer can move in the axial direction and does not rotate, so that the casing side retainer can be easily assembled even in a small diameter casing, and the assembly stability is high. It is excellent and has a long life effect.

An embodiment of the present invention described above and illustrated in the drawings should not be construed as limiting the technical idea of the present invention. The protection scope of the present invention is limited only by the matters described in the claims, and those skilled in the art can change and change the technical idea of the present invention in various forms. Therefore, such improvements and modifications will fall within the protection scope of the present invention as long as it will be apparent to those skilled in the art.

Claims (6)

 A casing 110 fixed to supply the fluid to the housing 1 of the machine tool, a casing retainer 120 inserted in the axial direction of the casing to move only in the axial direction without rotation, and the casing O-ring 140 is installed so as to seal between the inner circumferential surface of the casing and the outer circumferential surface of the casing retainer to be seated on the inner circumferential surface and fitted to the outer circumferential surface of the casing retainer, and the non-rotating seal member 150 seated on the lower portion of the casing retainer; And a cover 160 fitted to the lower portion of the casing, a ballistic member 170 having one end supported by the casing retainer and the other end supported by the cover, and an upper portion of the spindle 2 rotating at a high speed to the lower portion. And a spindle retainer 180 and a rotating seal member 190 fixed to the upper portion of the spindle retainer to be in close contact with and separate from the non-rotating seal member. In the rotary joint to the spindle for the machine tool, it characterized in that, Rotary casing for the spindle of the machine tool, characterized in that the upper portion of the casing retainer (120) has a resistance surface 122 of the fluid configured pointed. The method of claim 1, In order to widen the resistance surface 122 as much as possible, the width between the through hole 123 and the resistance surface 122 is within 1 mm so that the portion of the axial through hole 123 formed in the upper portion of the casing retainer 120 is not sharp. Rotary joint for the spindle of the machine tool, characterized in that the inclined configuration. The method according to claim 1 or 2, The inclined resistance surface 122 is a rotary joint for a spindle of a machine tool, characterized in that the outer surface of the casing retainer 120 to meet the stepped surface 124 in the direction of the central axis.  A casing 110 fixed to supply the fluid to the housing 1 of the machine tool, a casing retainer 120 inserted in the axial direction of the casing to move only in the axial direction without rotation, and the casing O-ring 140 is installed so as to seal between the inner circumferential surface of the casing and the outer circumferential surface of the casing retainer to be seated on the inner circumferential surface and fitted to the outer circumferential surface of the casing retainer, and the non-rotating seal member 150 seated on the lower portion of the casing retainer; And a cover 160 fitted to the lower portion of the casing, a ballistic member 170 having one end supported by the casing retainer and the other end supported by the cover, and an upper portion of the spindle 2 rotating at a high speed to the lower portion. And a spindle retainer 180 and a rotating seal member 190 fixed to the upper portion of the spindle retainer to be in close contact with and separate from the non-rotating seal member. In the rotary joint to the spindle for the machine tool, it characterized in that, The lower part of the casing 110, into which the casing retainer 120 is fitted, is formed with a predetermined length of the tube part 111 in a thin tube state, and the cover 160 is seated and fixed to an end of the tube part 111. A cover fixing part 112 is formed to surround 160 so that it does not fall out. A retainer guide part 113 cocked to protrude in an axial direction at a predetermined angle is formed in the pipe part 111 so that the retainer guide part 113 is casing. Rotary joint for the spindle of the machine tool, characterized in that to guide the groove 121 formed on the outer peripheral surface of the retainer (120). The method of claim 4, wherein The pipe part 111 has a stepped cover seating portion 114 is formed, the rotary joint for the spindle of the machine tool, it characterized in that the position of the cover 160 can be accurately seated. The method according to claim 4 or 5, Rotary tube for the spindle of the machine tool, characterized in that at least one through-hole 111a is formed in the pipe portion 111 in the axial direction.

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