JP2003071667A - Rotary table device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To solve a problem that the workability in changing seal components is poor since a rotary joint 22 is incorporated from both sides, i.e., a face side of a table 4 and a back side of a rotary table device with the rotary joint 22 built therein. SOLUTION: The rotary table device can be completely overhauled from one side during the maintenance by incorporating the rotary joint 22 and the rotary table device in the same direction, incorporating a clamp mechanism 15 and the rotary joint 22 in the same direction, and disposing the clamp mechanism 15 in a range of the rotary joint 22 in the radial direction of the table 4, and the working efficiency can be improved considerably.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rotary table device incorporating a rotary joint.

[0002]

2. Description of the Related Art The applicant of the present invention relates to a clamp mechanism using a fluid pressure of a rotary table device up to now.
No. 05832 is filed. In contrast,
In recent years, there has been an increasing demand for a type in which a rotary joint is mounted on the table body. Japanese Patent Publication No. 6-39864 and Japanese Patent No. 2930889 disclose applications that incorporate this rotary joint. Its fair 6-398
According to Japanese Patent Laid-Open No. 64, a distributor is vertically provided on the lower surface of the table body toward the surface of the table, and the distributor is inserted into a spindle that rotates integrally with the table through a bearing with respect to the table body. The distributor and the spindle are provided with a passage that connects the empty / hydraulic injection opening provided on the table and the circuit port formed at a predetermined position on the table surface, and the distributor and the spindle form a rotary joint. There is. In this way, since the distributor is hung vertically from the lower surface of the table main body toward the table surface, when disassembling the rotary joint at the time of maintenance of the rotary joint, the rotary table device in use is installed on the work machine. It had to be removed from the machine and, in addition, the table and the spindle had to be disassembled because the spindle formed part of the rotary joint.

Another technique is Japanese Patent No. 2930889.
Japanese Patent Publication No. JP-A-2003-242242, which includes a cylindrical distributor that is inserted from the lower surface of the table body, and a center shaft that is inserted into the center hole of the table from the upper surface and fixed to the table. A rotary joint is formed by and the empty / hydraulic injection opening provided in the table body and the circuit port formed at a predetermined position on the table are communicated with each other through the rotary joint, and The distributor and center shaft can be assembled without disassembling the table. In this rotary joint, the center shaft is inserted from the upper surface of the table and fixed to the table, and can be disassembled without removing it from the machine tool equipped with the rotary table device. However, when disassembling the tubular distributor that is inserted from the lower surface of the table body, it is necessary to remove the entire rotary table device from the machine tool as described above. However, these are applications excluding the clamp mechanism, and in the actual device, maintenance such as replacement of the seal member and the like is required in both the rotary joint and the clamp mechanism.

[0004]

As described above, in order to disassemble the clamp mechanism or the rotary joint, it is necessary to remove the entire rotary table device from the machine tool. Therefore, at the time of maintenance work, a large work area, a crane or the like is required. Was required, and it was troublesome to reproduce the reference position accuracy by removing it from the mounted machine tool, and the workability of sealing parts replacement work etc. was poor because the rotary joint alone could not be disassembled. .
Upon studying these problems, I realized that the cause was that the rotary joint was installed from both the front surface of the table and the back surface of the rotary table device. Therefore, an object of the present invention is to obtain a rotary table device in which maintenance work of a clamp mechanism or a rotary joint is simple.

[0005]

According to the present invention, there is provided a table main body having a fluid pressure input opening, a table rotatably supported by the table main body and having a central hole, and a table inserted into the central hole of the table. A rotary shaft having a fluid pressure outlet and a distributor that is inserted between the rotary shaft and the table body are provided, and the fluid pressure supplied to the table body by the rotary shaft and the distributor is guided to the outlet of the rotary shaft. A rotary joint is formed so that the rotary joint is incorporated from one direction of the table body, and a clamp mechanism for restraining rotation of the table is provided, and the clamp mechanism is the same as the rotary joint. It is installed from the direction.In addition, the clamp mechanism is Is that is disposed within the rotary joint in the radial direction of the cable.

[0006]

BEST MODE FOR CARRYING OUT THE INVENTION The present invention is an invention for improving workability when performing maintenance of a rotary joint or a clamp mechanism in a rotary table device, and is intended to provide a rotary joint rotary table device including a rotary shaft distributor. Are installed in the same direction, the clamp mechanism and the rotary joint are installed from the same direction, and the clamp mechanism is arranged within the range of the rotary joint in the radial direction of the table. As a result, when replacing the oil seals, O-rings, etc., which are consumable parts, all can be disassembled from one side of the rotary table device, and work efficiency is greatly improved.

[0007]

First Embodiment A first embodiment will be described with reference to the drawings.
FIG. 1 shows a rotary table device in which the distributor 19 and the rotary shaft 22 are incorporated from the upper surface of the table 4.
A table body 1 having a fluid pressure charging opening 1a supports a spindle 3 rotatably through a bearing 2 inside the table body 1 and having a through hole 3a,
A table 4 having a central hole 4a at the upper end of the spindle 3.
Is fixed with bolts 5, and the worm wheel 6 is concentrically fixed with bolts 7 on the outer circumference. A worm 8 for driving the table 4 is rotatably supported on the table body 1. The worm 8 is interlockingly connected to a drive source (not shown) such as a servomotor and a step motor, and meshes with the worm wheel 6. ing.

Further, a hollow distributor 39 which is inserted from above the center hole 4a of the table 4 and has a flow path 19a which is in communication with the fluid pressure injection opening 1a of the table body 1 has a through hole 3a of the spindle 3. The bearing portion 21b of the rotary shaft 21 which is fixed to the bottom lid 10 by bolts 20 and has a fluid pressure outlet 21a.
Is inserted into the hollow portion of the distributor 3 from the upper surface of the table 4, and the pressure supplied and discharged from the fluid pressure introduction opening 1a of the table body 1 by the outer peripheral surface of the bearing portion 21b and the inner peripheral surface of the distributor 19. A rotary joint 22 that guides the fluid to a fluid pressure outlet 21a of the rotary shaft 21 is formed, and a flange portion 21c of the rotary shaft 21 is fixed to the table 4 with a bolt 23.

A clamp mechanism 15 formed of a crank piston 12, a disk plate 14 and the like for restraining the rotation of the table 4 will be described. The clamp surface 12a is formed in the cylinder chamber 11 provided between the table body 1 and the bottom lid 10 fixed to the table body 1 by the bolt 9, and the clamp piston 12 having the sealing materials 16, 17, and 18 is inserted therein. Cylinder chamber 11a ・ 1
cylinder chambers 11a and 11b
Are provided with flow paths 11c and 11d in the table body 1 or the bottom cover 10 so that the pressure fluid can be supplied and discharged from the outside. The clamp surface 1b of the table body 1 and the clamp surface 12a of the clamp piston 12 face each other,
A disk-shaped disc plate 14 fixed to the inner end of the spindle 3 by a bolt 13 is provided between them,
By moving the clamp piston 12, the clamp surface 1b
A clamp mechanism 15 for restraining the rotation of the spindle 3 (table 4) by the disk 12a and the disk plate 14 is provided.

Next, the case of using the rotary table device configured as described above will be described. In order to mount the work on the jig A having a clamp jig (not shown) fixedly mounted on the surface of the table 4, pressure fluid is not shown from the fluid pressure injection opening 1a provided in the table body 1. It is guided by the external pressure fluid source to the fluid pressure outlet 21a via the flow passage 10a, the flow passages 19a and 21d of the rotary joint 22, and further to the fluid pressure outlet 21a.
Is guided to the clamp jig of the jig A fixedly mounted on the surface of the table 4 through a flow path (not shown) provided corresponding to the clamp jig for fixing the work to the jig A. Activate. A flow path similar to the above for guiding the pressure fluid to the clamp jig in order to open the work of the clamp jig is provided separately from the flow channel, and a switching valve provided outside is switched to switch the pressure fluid. The work is attached and detached by alternately supplying and discharging. Corresponding to the number of the clamp jigs of the jig A, the same clamp jigs and flow paths as described above are provided.

After the work is attached to the clamp jig attached to the jig A fixedly attached on the surface of the table 4, the worm 8 is rotated by a drive source (not shown) to mesh with the worm 8. Wheel 6,
The spindle 3, the rotary shaft 21, the table 4, and the jig A rotate integrally, and when the set rotation angle is reached, the drive source stops and the table 4 also stops. After that, the pressure fluid is supplied to the cylinder chamber 11b forming the clamp mechanism 15 via the flow path 11c, so that the clamp piston 12 causes the clamp surface 1b of the table body 1 to move.
Side, the clamp surface 12a of the clamp piston 12
The disc plate 14 is pressed against the clamp surface 1b,
Due to the frictional force generated on the clamp surfaces 1b and 12a and the disc plate 14, the rotation of the disc plate 14 is restrained, and the rotation of the table 4 is restrained. In this state, processing of the workpiece attached to the jig A provided with the clamp jig attached to the surface of the table 4 is started.

When the processing is completed, the switching valve (not shown) provided in the middle of the pipe from the external pressure fluid source (not shown) is switched to supply the pressure fluid from the flow passage 11d to the cylinder chamber 11a, and the cylinder chamber 11b. Fluid of the flow path 11
Clamping piston 12 by discharging via c
Moves in a direction to release the pressing of the disc plate 14, the clamp of the disc plate 12 is released, and the table 4 is ready to rotate. As a result, the worm 8 is rotated by a drive source (not shown) to return the table 4 to the original position, and the pressure fluid to the clamp jig fixing the workpiece is provided in the middle of the pipe from the pressure fluid source (not shown). By switching a switching valve (not shown) and releasing the work from the clamp jig, the processed work can be removed from the jig A. When there is processing at another position of the work, the work is performed by repeating the rotation of the table 4, rotation restraint (clamp), work processing, rotation restraint release, and rotation of the table 4 sequentially by a drive source (not shown). Be done.

The rotary table device repeats such operations, but the pressure fluid is made to flow between the flow passage 21d of the bearing portion 21b of the rotary shaft 21 constituting the rotary joint 22 and the flow passage 19a of the distributor 19. In addition, in order to prevent the pressure fluid from leaking, a seal material 24 made of an O-ring, resin or the like is attached to the inner peripheral side of the distributor 19 to separate and seal the respective flow paths. Depending on the frequency of use or changes over time, the sealing material 21 may be worn or damaged and the role of the seal may be reduced. It becomes impossible to control, the reliable clamping of the work is impaired, and problems with machining accuracy and safety occur. For this reason, it is necessary to repair and replace the sealing material, but depending on the production situation, it may take a short time, and repair and replacement at the production site may be required.
Often forced to perform maintenance for replacement. For this reason,
Maintenance work for these repairs / replacements is required to be simple and easy. For this purpose, the table 4 and the spindle 3 related to maintaining the precision of the rotary table device itself are not removed, and further, the rotary shaft 21 and the distributor 19 which form the rotary joint are both attached from the upper surface of the table 4. It can be taken out, and the work at the time of maintenance can be performed easily and dramatically.

FIG. 2 shows an embodiment in which both the rotary joint 22 and the clamp mechanism 15 are assembled from the lower surface of the table 4, and the assembling procedure will be described. First, the clamp mechanism 15 such as the disk plate 14 and the crank piston 12 is installed from the lower surface of the table. Next, the rotary shaft 21 is inserted into the table body 1 through the central hole 10b of the bottom lid 10 fixed by the bolts 9, and the outlet 21a of the rotary shaft 21 is connected to the fluid pressure injection opening 1a of the table body 1.
So as to be located above the table 4, the rotary shaft 21 is passed through the center hole 4a of the table 4 and the rotary shaft 21
Is fixed to the table 4 with the bolts 23 from the inner side of the bottom cover 10, the distributor 19 is inserted from the center hole 10b of the bottom cover 10, the hollow part of the distributor 19 is inserted into the bearing part 21b of the rotary shaft 21, 21b
And the inner peripheral surface of the distributor 19 form a rotary joint 22 that guides the pressure fluid supplied to the fluid pressure injection opening 1a of the table body 1 to the outlet 21a of the rotary shaft 21, and the flange portion of the distributor 19 19b is fixed to the bottom lid 10 with bolts 25. Thus, the rotary joint 22 and the clamp mechanism 15 can be removed from the lower surface of the table 4 without removing the table 4 from the spindle 3, and the maintenance of the sealing material of the rotary joint 22 and the clamp mechanism 15 becomes easy. That is, by removing the table 4 and the spindle 3 from one direction which is the lower surface of the table 4 without removing them, it is possible to perform maintenance work without removing many jigs A attached to the table surface. Needless to say. 1 and 2, the outer peripheral surface of the rotary shaft 21 that interlocks with the table 4 and the inner peripheral surface of the distributor 31 that is a stationary body constitute the rotary joint 22, but the outer peripheral surface of the distributor and the rotary shaft It is also possible to form a rotary joint with the inner peripheral surface.

FIG. 3 shows an embodiment in which both the rotary joint 22 and the clamp mechanism 15 are incorporated from the upper surface of the table 4. The distributor 39 has a large diameter and a small diameter, and the clamp mechanism 15 is provided on the small diameter portion. 12a
The clamp piston 12 is inserted and the clamp piston cover 26 is fixed to the side wall of the large diameter portion of the distributor 19 with the bolt 27 so that the clamp piston 12 can be operated. Further, the distributor 1 is provided with the flow passage 1 for supplying and discharging the pressure fluid to and from the cylinder chambers 11a and 11b.
9c and 19d, which are inserted from above the center hole 4a of the table 4 so as to communicate with the clamp operation connection ports 1e and 1f provided in the table body 1, and are attached to the table body 1 with bolts 20. . The pin 28 is provided so that the distributor 31 can be firmly fixed to the table body 1. An annular recess 29 is provided in the large diameter portion of the distributor 31 from the upper surface side of the table 4,
The rotary shaft 21 provided with the fluid pressure outlets 21a and 21d to be installed toward the center hole 4a of the table 4 is inserted into the recess 29, and is fixed to the table 4 with a bolt 23. As a result, the inner peripheral surface of the recess 29 and the outer peripheral surface of the rotary shaft 21, and the outer peripheral surface of the recess 29 and the inner peripheral surface of the rotary shaft 21 include the plurality of fluid pressure injection openings 1a of the table body 1 and the respective openings. The rotary joint 22 is configured so that the flow passage 19a of the distributor 19 and the flow passage 21d that communicates with the fluid pressure outlet 21a of the rotary shaft 21 communicate with each other via the flow passage 1c that communicates with 1a.

In order to restrain the rotation of the table 4, the pressure fluid is supplied and discharged from the clamp operation connection ports 1e and 1f to operate the clamp piston 12, and the disk fixed to the inner end of the spindle 3 with the bolt 13. This is done by pressing and releasing the plate 14 by the clamp surface 12a of the clamp piston 12 against the clamp surface 1b of the table body 1. When mounting and removing the work from the clamp jig for fixing the work of the jig A mounted on the surface of the table 4, the pressure fluid is supplied and discharged through the plurality of fluid pressure injection openings 1a provided in the table body 1. Is performed as described above. In this case, the maintenance of the sealing material of the clamp mechanism 15 and the rotary joint 22 is performed by the table 4
Can be easily performed by removing the distributor 31 and the rotary shaft 21 from one side from the upper surface side of the table 4 without removing them from the spindle 3.

FIG. 4 shows an embodiment in which both the rotary joint 22 and the clamp mechanism 15 are incorporated from the lower surface of the table 4. In the embodiment of FIG. 3, the clamp mechanism 15 and the rotary joint 22 are inserted from the center hole 4a of the table 4, In contrast to the structure for assembling and dismounting, the structure for inserting and assembling and dismounting is made from the center hole 10b on the bottom surface side of the table body 1. Insert the rotary shaft 21 from the center hole 10b of the table body 1,
a is fixed to the table 4 with a bolt 23 so that the fluid pressure outlet 21a is on the upper surface of the table 4, and the clamp mechanism 1
5 is inserted into the central hole 10b of the table body 1 to form a rotary joint 22 with the rotary shaft 21, and the disk plate 14 is fixed to the inner end surface of the spindle 3 with the bolt 13 and then positioned. The bolt 28 is used to fix the bottom lid 10 with the bolt 28 and the bolt 25 to the central hole 10b of the table body 1. In this case, the disc plate 14 is provided between the clamp surface 12a of the clamp piston 12 and the clamp surface 1b of the bottom lid 10, and the clamp piston 12 operates to perform clamping and unclamping. These operations are as described in the embodiment in FIG. In this case, since the rotary joint 22 and the clamp mechanism 15 can be removed from the center hole 10b on the bottom surface side of the table body 1 without removing the table 4 and the jig attached to the surface of the table 4, it is easy and short. The seal part can be maintained in time.

According to the first aspect of the present invention, the rotary joint is incorporated from one direction of the table body, and maintenance can be performed by disassembling only one direction of the table body. Maintenance can be performed efficiently and quickly. According to claim 2, the rotary joint and the clamp mechanism are incorporated from one direction of the table body, and all the main parts of the rotary table device which require maintenance can be processed by disassembling only one direction of the table body. It is possible to reduce man-hours drastically compared with the conventional method. According to claim 3, the rotary joint is incorporated from one direction of the table main body, and the clamp mechanism is arranged within the range of the rotary joint in the radial direction of the table, so that the consumable replacement part is extremely compact and the rotary table is provided. The entire device can be made compact.

[Brief description of drawings]

FIG. 1 is a vertical cross-sectional view of a table device in which a rotary joint showing a first embodiment of the present invention is incorporated from the front side of a table.

FIG. 2 is a vertical cross-sectional view of a table device in which a rotary joint showing a second embodiment of the present invention is incorporated from the back side of the table body.

FIG. 3 is a vertical cross-sectional view of a table device that incorporates a rotary joint and a clamp mechanism according to a third embodiment of the present invention from the front surface side of the table.

FIG. 4 is a vertical cross-sectional view of a table device that incorporates a rotary joint and a clamp mechanism according to a fourth embodiment of the present invention from the back side of a table body.

[Explanation of symbols]

1 table body 4 tables 15 Clamp mechanism 19 Day Tributor 21 rotary shaft 22 Rotary joint

Claims (3)

[Claims] 1. A table main body having a fluid pressure input opening, a table rotatably supported by the table main body and having a central hole, and a rotary shaft having a fluid pressure outlet inserted into the central hole of the table. And a distributor that is inserted between the rotary shaft and the table body, and the rotary shaft and the distributor form a rotary joint that guides the fluid pressure supplied to the table body to the outlet of the rotary shaft. A rotary table device, wherein the joint is configured to be incorporated from one direction of the table body. 2. A table main body having a fluid pressure input opening, a table rotatably supported by the table main body and having a central hole, and a rotary shaft having a fluid pressure outlet inserted into the central hole of the table. And a clamp mechanism for restraining rotation of the table and a distributor that is inserted between the rotary shaft and the table body, and the rotary shaft distributor distributes the fluid pressure supplied to the table body to the rotary. A rotary table having a structure in which a rotary joint that leads to the outlet of the shaft is formed, the rotary joint is incorporated from one direction of the table body, and the clamp mechanism is incorporated from the same direction as the rotary joint. apparatus. 3. The rotary table device according to claim 2, wherein the clamp mechanism is arranged within the range of the rotary joint in the radial direction of the table.