JPH11165209A - Safety device for rotary cylinder - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a safety device for a rotary cylinder which can fix a distributor on a housing without deforming a bearing supporting a cylinder body and releases the fixation speedily to prevent the housing from rotating when the distributor and the cylinder body are seized. SOLUTION: The fixation of a distributor 9 in the direction of rotation is done by engaging a projecting part 12a of a bolt 12 with a recessed part 9b from the circumferential direction. When the rotation force in the circumferential direction exceeding a predetermined force acts on the bolt 12 due to seizure of a cylinder body and the distributor 9, a cut-in part 12c of the bolt 12 is broken to separate the projecting part 12a so that the fixation of a position in the direction of rotation of the distributor 9 is released.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rotary cylinder for controlling the operation of a chuck mounted on a lathe or the like.

[0002]

2. Description of the Related Art Conventionally, in a rotary cylinder, a cylinder body in which a piston is fitted so as to be movable in an axial direction is rotatably supported by a distributor via a bearing, and the distributor collects a drain. And is fitted into an annular support hole provided in a housing. The distributor fitted into the annular support hole is positioned and fixed by pressing the tip of a fixing bolt screwed into the housing against the outer periphery of the distributor (Japanese Patent Publication No. 63-41689). One in which the tip of a fixing bolt screwed into a housing is fitted into a radial hole formed in a distributor (Japanese Patent Laid-Open No. 61-241505).
No.) are known.

[0003]

In the conventional rotary cylinder, when the distributor fitted into the annular support hole is slightly rotated in the opposite direction by the high-speed rotation of the cylinder body, vibration or the like is caused. It is fixed to the housing via the fixing bolt as described above. However, in this case, the fixing bolt presses the outer periphery of the distributor near the bearing to avoid and fix the annular groove such as an oil passage provided in the distributor, so that the tightening force of the fixing bolt deforms the bearing. There was a risk of doing so. Also, in the case where foreign matter or the like is mixed in a slight annular rotation gap between the distributor and the cylinder main body and the distributor and the cylinder main body are burned and rotated integrally, the tip of the fixing bolt is displaced by the distributor. Since the fixing bolt is not specially designed, the rotational force of the cylinder body rotates the entire rotating cylinder via the distributor and the housing is fixed to the housing. There was a risk that the connected hydraulic hose would be swung. Therefore, an object of the present invention is to fix the distributor to the housing without deforming the bearing supporting the cylinder body, and to immediately release the fixing when the distributor and the cylinder body are seized. Accordingly, it is an object of the present invention to provide a safety device for a rotating cylinder that prevents the housing from rotating.

[0004]

In order to solve the above-mentioned problems, the present invention provides a cylinder body, in which a piston is fitted so as to be movable in an axial direction, rotatably supported by a distributor via a bearing, and the distributor is provided with a cylinder body. In a rotary cylinder having a housing fitted to an annular support hole provided in a housing for collecting drain, a protrusion is fitted to one member of the housing and the distributor and the protrusion is fitted to the other member. A rotation preventing mechanism for stopping relative rotation between the housing and the distributor by engagement of the housing and the distributor with each other in the circumferential direction. The housing is configured to be broken when acting between the distributors, and when broken, the housing body and the distributor can be relatively rotated. .

The protruding portion is a portion of a pin member provided integrally with the housing, which protrudes radially inward of the housing, and a boundary portion between the housing and the distributor is fixed to the housing. The cross-sectional area is smaller than that of.

Specifically, the pin member is a bolt, and a cut portion having a diameter smaller than that of a fixing member to the housing is formed at a boundary between the housing of the bolt and the distributor.

[0007]

Embodiments of the present invention will be described with reference to the drawings. In FIGS. 1 to 3, a cylinder body 2 of a rotary cylinder 1 forms a cylinder chamber 5 by closing a front end face 3a of a distributor shaft 3 with a bowl-shaped rod cover-4. It is configured to be fitted so as to be movable in the direction. The cylinder chamber 5 is divided by a piston 6 into front and rear cylinder chambers 5a and 5b. A restricting pin 7 for restricting relative rotation with respect to the cylinder body 2 is fixed to the piston 6. A distributor 9 is relatively rotatably supported on a rear shaft portion 3b having a small diameter of the distributor shaft 3 via a pair of bearings 8. The front side of the bearing 8 fitted to both ends of the distributor 9 abuts on the front rear surface 3c of the distributor shaft, and the rear side bearing 8 is an end cap fixed to the rear end surface 3d of the distributor shaft. It is in contact with 10. The cylindrical outer peripheral portion of the distributor 9 is fitted into the annular support hole 11a provided in the housing 11 for collecting drain so as to be relatively rotatable, and the rear end face 9a of the distributor 9 is formed into the annular support hole 11a.
Is in contact with the end face 11b of the rim. Bolts 12 forming a rotation preventing mechanism together with the concave portions 9b fix the distributor 9 in the rotation direction.

The distributor 9 is provided with two annular grooves 13a and 13b for supplying and discharging fluid to the front and rear cylinder chambers 5a and 5b. Each groove 13a, 13b
Are connected to a pair of supply / discharge ports (not shown) provided on the outer periphery of the housing 11 so as not to interfere with each other, with phases different from each other in the circumferential direction and the axial direction. Not connected via hose. Annular groove 1 for feeding and discharging
One of the annular grooves 13a is a flow path 14 provided in the distributor shaft 3 and a rod cover-4.
, And communicates with the front cylinder chamber 5a via a flow path 15 provided in the front side. The other annular groove 13b is provided in the distribution
It communicates with the rear cylinder chamber 5b via a flow path 16 provided in the shaft 3.

A rear end of a connecting pipe 18 provided at the center of a spindle 17 of a machine tool is non-rotatably connected to the rod portion 6a of the piston 6.
The piston 6 is reciprocated by fluid pressure supplied to the cylinder chamber 5, and the chuck pawl 19a can be opened and closed by the reciprocation. And rod cover-4
The rear end of the spindle 17 is coupled to the front surface of the cylinder 17 via the mounting adapter 20, and the cylinder body 2 rotates integrally with the chuck 19 via the spindle 17.

A portion of the bolt 12 protruding radially inward of the housing 11 is a projection 12a.
The projection 12a engages with a concave portion 9b (a concave hole having a predetermined depth) provided on the outer periphery of the distributor 9 to stop the relative rotation of the distributor 9 in the circumferential direction. The mechanism is configured. The bolt 12 has a cut portion (annular groove) 1 having a diameter smaller than that of a screw portion 12b to the housing 11 at a root portion of the projection portion 12a, that is, at a boundary portion between the housing 11 and the distributor 9.
2c, and the cross-sectional area of the cut 12c is
2b. The notch 12c is formed in the annular rotating gap T between the narrow shaft portion 3b of the distributor shaft 3 and the distributor 9 by foreign matter or the like and seized, so that the distributor 9 is integrated with the distributor shaft 3. The circumferential torque slightly smaller than the circumferential torque generated when rotating the distribution
The cut amount is set so as to break when acting on the table 9.

Since the distributor 9 is fixed in the rotational direction by engaging the projection 12a of the bolt 12 with the recess 9b from the circumferential direction, no tightening force is applied to the bearing 8 from the outside in the radial direction. There is no deformation of the bearing 8. In this embodiment, the distributor 9 is provided with the concave portion 9b.
The distributor 9 may be provided with a protruding portion 12a formed with a cut portion 12c, and the housing 11 may be provided with a concave portion to engage with each other. As shown in FIG. 4A, a pin member 30 such as a taper pin is attached to the housing 1.
1, the tip of the pin in the radial direction is a protruding portion, and a through hole 30 a is provided in a boundary portion between the housing 11 of the pin member and the distributor 9 in a direction orthogonal to the axis of the pin. May be weakened mechanically. Further, as shown in FIG. 4B, the cutout portion 12c may be provided in the pin member 30A.

The driving of the lathe or the like causes the cylinder body 2 of the rotary cylinder 1 to rotate at high speed. If foreign matter or the like enters the annular rotation gap T between the thin shaft portion 3b of the cylinder body 2 and the distributor 9 during rotation, the cylinder body 2 and the distributor 9 are seized. At this time, the rotational force of the cylinder body 2 is transmitted via the distributor 9 to the rotating cylinder 1.
Try to rotate the whole. However, the bolts 12 that position and fix the rotational direction of the distributor 9 are fixed.
In addition, since the cylinder body 2 and the distributor 9 are seized, a circumferential rotational force greater than a predetermined value acts. Then, the notch 12c is immediately broken and the protrusion 1 of the bolt 12 is formed.
2a is cut off. As a result, the bolt 12 cannot maintain the fixed position of the distributor 9 in the rotational direction, so that the cylinder body 2 and the distributor 9
The distributor 9 keeps the housing 1 even if the
1, the rotating cylinder 1 is not rotated. Therefore, there is no danger that the hydraulic hose (not shown) connected to the housing 11 is swung.

[0013]

As described above, according to the present invention, the distributor fixed in the annular support hole provided in the housing is fixed in the rotation direction from the radially inner side of the housing to the concave portion provided in the distributor. This is performed by engaging the protruding projections from the circumferential direction, and the projections are set so as to be broken when a predetermined or more circumferential rotational force acts between the housing and the distributor. In addition to not causing deformation of the bearing inside the distributor, when there is seizure between the cylinder body and the distributor, the protrusion is broken and the positioning of the distributor and the housing can be released, As a result, the rotation of the housing can be prevented, and there is no accident of swinging the hose, which is safe.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view of a rotary cylinder with a safety device according to the present invention.

FIG. 2 is an enlarged sectional view taken along line II-II.

FIG. 3 is a view showing attachment of a rotary cylinder to a spindle.

FIG. 4 is a diagram showing another embodiment.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Rotary cylinder 2 Cylinder main body 6 Piston 9 Distributor 11 Housing 11a Annular support hole 12 Bolt 12a Projection 12b Threaded portion 12c Cut portion

Claims (3)

[Claims] A cylinder body in which a piston is fitted so as to be movable in the axial direction is rotatably supported by a distributor via a bearing, and the distributor is fitted in an annular support hole provided in a housing for collecting drain. In the rotary cylinder, the housing and the distributor are provided with a protrusion on one member, and the other member is provided with a recess for fitting the protrusion, and the relative engagement between the housing and the distributor is established by engaging both members in the circumferential direction. A rotation preventing mechanism for stopping rotation is formed, and the projection is configured to be damaged when a predetermined or more circumferential rotational force acts between the housing and the distributor. A safety device for a rotary cylinder, characterized in that the viewer can rotate relatively. 2. The projection is a portion of a pin member provided integrally with the housing, which protrudes radially inward of the housing, and a boundary portion between the housing and the distributor of the pin member serves as a fixing portion to the housing. The safety device for a rotary cylinder according to claim 1, wherein the cross-sectional area is smaller than that of the safety device. 3. The rotary cylinder according to claim 2, wherein the pin member is a bolt, and a cut portion having a smaller diameter than a portion fixed to the housing is formed at a boundary between the housing and the distributor of the bolt. Safety equipment.