JPH0426963B2 - - Google Patents

Description

[Detailed Description of the Invention] Technical Field The present application relates to a rotary cylinder distributor for operating a mechanical chuck attached to a machine tool such as a lathe or turret lathe, and is applicable to both pneumatic and hydraulic systems. .

Prior art and its problems Conventional rotary cylinder distributors are, for example,
As disclosed in Publication No. 57-49323, a distribution tube (distributor body) for supplying and discharging pressurized fluid is attached to the outer periphery of a distribution shaft (rotating shaft) that protrudes rearward of the cylinder body via a bearing. At least two supply and discharge ports for supplying and discharging pressurized fluid are arranged in parallel in the axial direction in the distribution cylinder. Therefore, the amount of protrusion of the distributor to the rear of the cylinder increases, and the axial length of the rotary cylinder including the distributor increases, and this tendency becomes even more pronounced in the case of a distributor equipped with a water injection port.
This type of rotating cylinder is used by being connected to a mechanical chuck via a spindle and a connecting rod, but if the length of the connected rotating unit in the direction of the rotation axis becomes long, vibrations due to rotation will occur. It is difficult to adapt to high-speed rotation due to the increase in the
Moreover, the mounting space in the axial direction becomes large, resulting in the problem that the installation pace of the machine tool increases.

Purpose and Summary In view of the above-mentioned conventional problems, the present invention seeks to provide a distributor that can significantly shorten the length of a rotating cylinder in the direction of the rotational axis. , distribution of a rotating cylinder consisting of a rotating side member having at least two pressure fluid communication paths, and a stationary side member attached to the rotating side member via a bearing and having at least two pressure fluid communication paths. In the device, the rotating side member is constituted by a distribution cylinder having a hollow hole in the center of rotation, and the stationary side member is fitted into the hollow hole and rotatably supported by a bearing.A distribution shaft 1
and a flange formed on the outer periphery of the rear end of the distribution shaft 1, and at least two supply/discharge ports 3a, 4a spaced apart in the circumferential direction on the same circumference of the outer periphery of the flange 2. At the same time, two communicating holes 15a, 17a are bored on the outer periphery of the distribution shaft 1, and the supply/discharge ports 3a, 4a and the connecting holes 17a,
15a are connected through fluid pipes 3 and 4 to form the communication path.

Embodiment First, in FIG. 1, reference numeral 6 denotes a cylinder body of a cylinder for operating a chuck pawl, which is composed of a front plate 6a and a casing 6b, and a piston 9 housed in a piston chamber 8 of the cylinder body 6 has a rod. In the drawing, the rearwardly projecting portion of this rod 7 also serves as the rotating side member of the distributor. In addition, Japanese Patent Publication No. 56-24803, Japanese Patent Publication No. 55-145805
As is clear from the above publications, it is also possible to construct the rotating side member of the distributor with a cylinder body. The rear projecting portion of the rod 7 has a hollow hole 7d formed at its center of rotation to form a distribution tube. This distribution tube includes fluid pipes 10 and 1 that guide the pressure fluid distributed by a distribution shaft 1 (to be described later) to a predetermined location.
1, 12, and 13 (hereinafter referred to as flow paths) are perforated. In the above description, the rod 7 and the piston 9 are made up of two members, but even if they are integrally constructed, there is no problem in implementing the present invention.

Next, the fixed side member A of the distributor will be explained. This fixed side member A includes a distribution shaft 1 that is fitted into the hollow hole 7d of the rod 7 and rotatably supported by bearings 14, 14, and an outer periphery of the rear end of the distribution shaft 1 that projects rearward from the distribution tube. As shown in FIG. 2, three supply/discharge ports are provided on the outer peripheral surface 2a of the flange portion 2 radially and at intervals in the circumferential direction on the same circumference. 3a, 4a, and 5a are drilled. Also, distribution axis 1
Two communicating holes 15a and 17a are bored on the outer periphery of the
As shown in FIG. 1, the supply/discharge port 3a and the communication hole 17
a is communicated through a flow path 3, and the supply/discharge port 4a and communication hole 15a are communicated through a flow path 4. The above supply/discharge ports 3a, 4a, flow paths 3, 4, communication holes 17a, 15
a constitutes a communication path for pressurized fluid that operates the piston 9. The supply/discharge port 5a communicates with a flow path 5 opening at the tip of the distribution shaft 1 of the stationary member A, and constitutes a communication path for water, oil, and air used for work cleaning, cooling, cutting, etc. In the above embodiment, the distribution shaft 1 and the flange portion 2 of the stationary member A are formed integrally, but they may be formed separately and fixed together by an appropriate method.

Next, communication between the rod 7 of the rotary side member and each communication path bored in the stationary side member A is performed as follows. Among the communication passages drilled in the rod 7, the flow passage 10 first includes the communication hole 15, the annular groove 16 bored in the inner surface of the hollow hole 7d, and the communication hole 15a of the fixed side member A.
It communicates with the flow path 4 of the stationary side member A through, and its front end is open to the cylinder chamber 8 on the front side of the piston 9, so that the pressurized fluid supplied from the flow path 4 is guided to the cylinder chamber 8 on the front side. There is. Next, the flow path 11 is
The communication hole 17 communicates with the flow path 3 of the stationary side member A through the annular groove 18 bored in the rod 7 in the same manner as described above and the communication hole 17a of the stationary side member, and the communication hole 19
This communicates with the cylinder chamber 8 on the rear side of the piston 9, and guides the pressure fluid supplied from the flow path 3 of the fixed side member A to the cylinder chamber 8 on the rear side. In addition, the flow path 12 provided in the rod 7 has a front end opening into the connecting rod attachment hole 20 and the other end opening into the hollow hole 7d of the rod 7. Pressurized fluid for use in other applications is supplied to the chuck (both not shown) via a connecting rod. A flow path 13 bored in the rod 7 is a flow path for collecting drain, and drain is collected from various places inside the rod 7. A drain reservoir 2 fixed to the flange 2 covers the rear end of the rod 7.
1, and the drain is discharged to the outside from the discharge port 21a. In addition, in the drawing, 22
2 is a mounting seat for a stroke confirmation dog provided on the upper surface of the drain reservoir 21, and 23 is a sealing member such as a mechanical seal. Incidentally, in the drawings of the above-mentioned embodiments, in order to facilitate the explanation, the drawings are simplified without considering assembly.

Regarding the rotating cylinder distributor as described above,
A hollow hole 7d is provided at the center of rotation of the rod 7 of the cylinder, which is a rotating member of the distributor.
The distribution shaft 1 of the stationary side member A is rotatably fitted into the inside, and only the flange portion 2 of the stationary side member A protrudes to the rear of the rotating side member, so that the length of the rotating cylinder in the direction of the rotation axis can be It can be made extremely short, and the installation space in the axial direction of the rotating cylinder can be reduced.

Next, the second embodiment shown in FIGS. 3 and 4 is as follows. In this embodiment, one of the three channels 3, 4, and 5 bored in the fixed side member B is used as a drain channel, and the drain collected in the drain channel 13 is is discharged to the outside from the supply/discharge port 5a of the flange 2 via the flow path 5,
The drain reservoir 21 in the first embodiment is not provided. In this embodiment, the piston rod 7a is directly fixed to the piston 9, and the cylinder 7b is integrally fitted into the hollow hole of the piston rod 7a, and into which the distribution shaft 1 of the distributor is fitted. The distribution tube of the rotating side member is composed of two members, and whether the distribution tube is constructed as one piece or two members is a design choice that takes into account processing, assembly, etc. In order to prevent seizure due to high-speed rotation in a cylinder using pneumatic pressure, the cylinder body 7b is used.
It is preferable to use a metal member for a bearing made of bronze casting or the like. Since the distribution tube is composed of two members, the flow paths 3 and 4 are connected to the flow paths 10 and 11.
Annular grooves 16a, 18a and communication holes 15b, 17b are added to guide pressure fluid to the piston, and 24 is a stopper for adjusting the piston stroke.

Furthermore, the third embodiment shown in FIGS. 5 and 6 is a distributor of a hollow rotary cylinder for machining long objects such as pipes and bars, and the distribution shaft 1 and flange portion 2 of the stationary member C are hollow. A hole 1a is formed, and the front end of the hollow pipe 25 inserted into the hollow hole 1a is connected to the piston rod 7.
A is fixed to the front end of the bearing 14a, and the rear end is fixed to the bearing 14a.
As a result, the hollow pipe 25 is rotatably supported by the stationary member C so that the hollow pipe 25 rotates together with the rotating cylinder 6. Two channels 3 and 4 are perforated in the fixed side member C, and the pressurized fluid supplied to the channel 4 is passed through the annular grooves 16 and 16a and the communication holes 15 and 15a and 15.
b, the difference is that it is guided to the cylinder chamber 8 on the right side of FIG. 6 through the flow paths 10 and 19a, and the rest is the same as the first and second embodiments.

Effects of the Invention As described above, in the present invention, the rotating side member of the distributor is constituted by a distribution cylinder having a hollow hole in the center of rotation, and the stationary side member is attached to the hollow hole of the distribution cylinder via a bearing. Since the distribution shaft is composed of a distribution shaft and a flange formed on the outer periphery of the rear end of the distribution shaft, the amount of protrusion of the stationary side member that protrudes rearward from the rear end of the rotation side member can be made as small as possible. In addition, multiple supply/discharge ports are drilled at intervals in the circumferential direction on the same circumference on the outer periphery of the flange, so the thickness of the flange can be made extremely small, and as a result, the length of the rotating cylinder in the direction of the rotation axis can be reduced. It is possible to shorten the rotary cylinder, prevent the occurrence of vibrations due to rotation, and increase the rigidity so that it is suitable for high-speed rotation, and the installation space in the axial direction of the rotary cylinder can be reduced.

[Brief explanation of drawings]

The drawings show embodiments of the present invention, and FIG.
2 is a partially omitted left end view of FIG. 1, FIG. 3 is a sectional view of the second embodiment, and FIG. 4 is a sectional view of the embodiment.
The drawings are a left end view of FIG. 3 with a part omitted, FIG. 5 a sectional view of the third embodiment, and FIG. 6 a left end view of FIG. 5 with a part omitted. A, B, C... Fixed side member of the distributor, 1... Distribution shaft of the distributor (fixed side member), 2... Flange part (fixed side member), 3, 4... Fluid pipe line (communication path) ),
3a, 4a... Supply/discharge port (communication path), 6... Cylinder body, 7... Rod (rotating side member), 14,
14a...Bearing, 15a, 17a...Communication hole (communication path).

Claims (1)

[Claims] 1. A rotating side member that is disposed on the rear side of a rotating cylinder and has at least two pressurized fluid communication paths, and a rotating side member that is attached to the rotating side member via a bearing and has at least two pressurized fluid communication paths. In the distributor of a rotary cylinder, the rotary side member is constituted by a distribution cylinder having a hollow hole in the center of rotation, and the fixed side member is fitted into the hollow hole and can freely rotate on a bearing. It consists of a distribution shaft 1 supported on the distribution shaft 1 and a flange formed on the outer periphery of the rear end of the distribution shaft 1, and at least two Two communication holes 15a, 1 are provided on the outer periphery of the distribution shaft 1.
7a, and the supply/discharge ports 3a, 4a and the connection holes 17a, 15a are communicated with the fluid pipes 3, 4 to constitute the communication path.