JP7357449B2 - rotating cylinder - Google Patents

Description

The present invention relates to rotating cylinders.

Conventionally, when supplying fluid from a solid rotating cylinder to a chuck (not shown), etc., the hole size was not large enough to allow a workpiece to be inserted (a so-called hollow rotating cylinder), but the hole size was large enough to supply fluid to the center of the cylinder. A route (see FIG. 1 of Patent Document 1) is provided. This allows fluid to flow from one end (rear side) of the cylinder to the other end (front side), and the fluid can be supplied to a chuck or the like (not shown).
Further, as such a solid rotary cylinder, there is a rotary cylinder 1 dedicated to air injection, which supplies air pressure to the center of the piston 3, as shown in FIG. This rotating cylinder 1 mainly includes a cylinder body 2, a piston 3 that is movable in the axial direction within the cylinder body 2, a sleeve 7 that rotatably supports the cylinder body 2, and one end (rear side) of the sleeve 7. The sleeve cover 8 is fixed to the sleeve cover 8 and has a passage A formed therein for supplying air pressure to the cylinder body 2. As a result, the rotary cylinder 1 connects the air pressure supplied from the outside to the sleeve cover 8, and passes the air pressure from the connection point to the air reservoir 5 through the passage A bored inside the sleeve cover 8. The configuration is such that air pressure can be supplied to the center of the piston rod 3 by supplying air pressure to the flow path C of the cylinder body 2.
The solid rotary cylinder also includes a rotary cylinder 1 dedicated to oil lubrication that supplies oil pressure to the center of the piston 3, as shown in FIG. This rotating cylinder 1 mainly includes a cylinder body 2, a piston 3 that is movable in the axial direction within the cylinder body 2, a sleeve 7 that rotatably supports the cylinder body 2, and one end (rear side) of the sleeve 7. The sleeve cover 8 is fixed to the sleeve cover 8 and has a passage B formed therein for supplying hydraulic pressure to the cylinder body 2. Such a rotary cylinder 1 connects hydraulic pressure supplied from the outside to the sleeve cover 8, and supplies the hydraulic pressure from the connection point to the oil reservoir 6 via a passage B bored inside the sleeve cover 8. By supplying hydraulic pressure to the flow path C of the cylinder body 2, hydraulic pressure can be supplied to the center of the piston 3. In the case of oil supply, a mechanical seal 9 is provided on the outer periphery of one end (rear side) of the cylinder body 2 to prevent oil from leaking from inside.

Japanese Patent Application Publication No. 62-271610

However, since conventional rotary cylinders are designed specifically for air injection or oil injection, there are many types of rotary cylinders available. Furthermore, when considering the rotating cylinder as a whole, the number of parts increases, and the assembly work process also becomes multi-step. Furthermore, it also affects management and storage.
Furthermore, in the case of lubricating, the length in the axial direction becomes longer due to the mechanical seal.

The present invention has been made to solve the above problems, and aims to provide a rotating cylinder that can consolidate parts, thereby reducing the lineup and number of parts, and simplifying assembly work. purpose.

a cylinder body that is a rotating body; a piston that is slidably inserted in the cylinder body in the axial direction; a rotary support body that is a fixed body that rotatably supports the cylinder body; A rotary cylinder, comprising: a cover fixed to a support body and covering one end side of the cylinder body; and a fluid supply path extending in the axial direction is bored in the center of the cylinder body, A rotary joint is provided for supplying fluid from a stationary body side to a rotating body side, the rotary joint includes a stationary side member and a rotating side member, the stationary side member is fitted to the cover, and the rotating side member is fitted to the cylinder side. The cover is fitted to one end of the main body facing the fixed member, and the cover is provided with a fluid reservoir at one end of the fixed member, and has one end open to the fluid reservoir and the other end. A rotary cylinder is provided, in which a supply flow path is provided that opens on the outer circumferential surface of the cover.

In the rotary cylinder according to the present invention, either pneumatic or hydraulic fluid can be supplied to the rotating body side with one rotary joint, so there is no need to provide separate lineups for air injection and oil injection, and the number of lineups increases. can be reduced. Further, the number of parts can be reduced and the assembly work can be simplified, which is an advantageous effect.

Preferably, the fixed side member is always urged toward the rotating side member by an elastic body, and the fixed side member and the rotating side member are always in contact with each other even when rotating or not rotating. It is provided.

According to the present invention, it is possible to provide a rotary cylinder that can consolidate parts, thereby reducing the lineup and number of parts, and simplifying assembly work.

FIG. 3 is a cross-sectional view of the rotating cylinder with the piston at the forward end position. FIG. 3 is a cross-sectional view of the rotating cylinder with the piston in the retracted end position. A cross-sectional view of a conventional rotating cylinder. A cross-sectional view of a conventional rotating cylinder.

A preferred embodiment of the rotating cylinder of the present invention will be specifically described with reference to the drawings. Further, the present invention is not limited to the following embodiments, and changes can be made as appropriate without departing from the scope of achieving the effects of the present invention. In the following, for convenience of explanation, the right side of the paper may be referred to as the front, and the left side of the paper may be referred to as the rear. Further, the front side may be called the other end side, and the rear side may be called the one end side.

(overall structure)
The overall configuration of the rotating cylinder 100 will be described below. 1 and 2 are sectional views of the rotary cylinder 100, respectively, with FIG. 1 showing the forward end state of the piston 20, and FIG. 2 showing the retracting end state of the piston 20.
The rotating cylinder 100 of this embodiment rotates together with a chuck (not shown) attached to a machine tool such as a lathe, and is mainly used for gripping or releasing a workpiece by the chuck. As shown in FIGS. 1 and 2, the rotating cylinder 100 includes a cylinder body 10, a piston 20, a rotating support 60, a rotary joint 70, a cover 80, and the like.

The cylinder body 10 is a rotating body, and includes a cylinder cover 11, a rotary valve 12, etc., and the cylinder cover 11 is fixed to the rotary valve 12 with bolts.
The cylinder cover 11 is a bottomed cylindrical member having a hydraulic space R therein, and the open end of the cylinder cover 11 is closed by a rotary valve 12. A piston 20 is housed in the hydraulic space R so as to be slidable in a direction parallel to the axis L (hereinafter sometimes referred to as the axial direction).

The piston 20 is composed of a partition plate part 21 and a rod part 22, and the partition plate part 21 is made of a cylindrical member and partitions the hydraulic space R into a first hydraulic space and a second hydraulic space. The rod portion 21 is integrally provided so as to extend in the axial direction from the center of the front side of the partition plate portion 21 in a substantially cylindrical shape. The tip of the rod portion 21 is provided in a portion exposed to the outside from the hydraulic space R so as to always protrude.

Therefore, in the state shown in FIG. 2, when the oil pressure in the part (second hydraulic space) located on the left side of the partition plate part 21 (piston 20) in the hydraulic space R is increased, the piston 20 slides to the right, and the piston 20 slides to the right. As shown in FIG. 1, the rod portion 21 is in a largely protruding state. On the other hand, in the state shown in FIG. 1, when the oil pressure in the part (first hydraulic space) located on the right side of the partition plate part 21 (piston 20) in the hydraulic space R is increased, the piston 20 slides to the left, and as shown in FIG. 2, the amount of protrusion of the rod portion 21 becomes smaller. The hydraulic pressure in the hydraulic space R is controlled by a hydraulic control means (not shown).

Further, in the center of the piston 20, a through hole 23 is provided in the axial direction through which a communication portion 12b of the rotary valve 12 (cylinder body 10), which will be described later, is inserted at all times.

The rotary valve 12 is a top-shaped member, and includes a cylindrical closing portion 12a that closes the cylinder cover 11, a communication portion 12b that is always inserted into the through hole 23, and a bearing on the rotation support 60. A support portion 12c rotatably supported via the support portion 12c.
The communication part 12b extends in a substantially columnar shape from the front center of the closure part 12a and is integrally provided with the closure part 12a, and the support part 12c extends in a substantially columnar shape from the rear center of the closure part 12a. It is provided integrally with the closing portion 12a.

Further, the rotary valve 12 is provided with a fluid supply path 12d extending in the axial direction through which fluid can flow from the front end surface of the communication section 12b to the rear end surface of the support section 12c via the closing section 12a. There is. Thereby, the fluid supplied to the fluid supply path 12d can be supplied to the through hole 23 on the piston side.

Further, a rotation side member 71 (rotary joint 70), which will be described later, is fitted into the fluid supply path 12d at one end (rear side) of the rotary valve 12, and a through hole is provided in the center of the rotary joint 70 in the axial direction. is provided, whereby fluid is supplied from one end side to the other end side of the rotary joint 70, and the fluid is supplied to the fluid supply path 12d.

The rotary support body 60 is a substantially cylindrical member, and is always fixed (non-rotating) to a fixed part of the lathe, and allows the rotary valve 12 (support part 12c) to rotate via a bearing on the inner peripheral side. I support it. That is, the rotation support body 60 rotatably supports the cylinder body 10 and the piston 20 provided therein.

The rotary joint 70 is a member that supplies fluid from the stationary side to the rotating side, and includes a stationary side member 72 and a rotating side member 71.
The fixed side member 72 is fitted into a cover 80, which will be described later, and the rotating side member 71 is fitted on one end side of the rotary valve 12 (cylinder body 10) so as to face the fixed side member 72.
Further, the stationary side member 72 is always urged toward the rotating side member 71 by the urging means. In other words, the cover 80 is provided with a coil spring (elastic body), and the other end side constantly urges the stationary side member 72 in the axial direction toward the rotating side member 71 side. As a result, the rotating member 71 and the stationary member 72 are always in contact with each other, either during rotation or non-rotation.
Note that although a coil spring is used as the elastic body, the present invention is not limited to this and may be an elastomer member.

The cover 80 is fixed to the rotary support body 60 and is provided so as to cover the support portion 12c (rotary valve 12) near the center of the other end (front side). Further, the outer diameter size of the cover 80 is the same as the outer diameter size of the rotary support body 60, and the axes of the cover 80 and the rotary support body 60 are provided so as to coincide with each other.

Further, a fixed side member 72 (rotary joint 70) is fitted to the other end side (front side) of the cover 80, facing the rotating side member 71, and one end side (rear side) of the fixed side member 72 A fluid storage chamber m is provided in which the fluid is temporarily stored.

Further, a supply channel D is provided, one end of which opens into the fluid reservoir m, and the other end of which opens onto the outer circumferential surface of the cover 80.
Further, a drain chamber n is provided in the vicinity where the cover 80 covers one end side (rear side) of the support portion 12c to collect fluid leaked from the sliding surface between the rotating side member 71 and the stationary side member 72. A drain passage E is provided, one end of which opens into the drain chamber n, and the other end of which opens onto the outer peripheral surface of the cover 80.
Thereby, for example, fluid can be supplied from the outside to the fluid reservoir chamber m via the supply channel D, and the supplied fluid can be supplied to the fluid supply channel 12d via the through hole of the rotary joint 70. It becomes possible. Therefore, fluid is supplied to the through hole 23 of the piston 20.

On the other hand, fluid leaking from the sliding surface between the rotating side member 71 and the stationary side member 72 is temporarily stored in the drain chamber n and is discharged to the outside via the drain channel E. Become.

The fluid can be pneumatic, hydraulic, or coolant or cutting oil, depending on the customer's specifications. That is, one rotary cylinder can provide three functions (integration of parts), thereby reducing the lineup and the number of parts. Furthermore, assembly work can also be simplified.

Although the present invention has been described above with reference to preferred embodiments, such description is not a limitation and, of course, various modifications are possible. For example, the number of supply channels D is not limited to one, and two or more may be provided depending on the usage conditions.

Also, depending on the customer's specifications, it is possible to easily customize the system by removing the cover 80 and rotary joint 70 and directly installing a rotating union (not shown) on one end of the rotating valve 12 (cylinder body 10). be.

4. Conclusion As described above, according to the present embodiment, it is possible to implement a rotating cylinder that can consolidate parts, thereby reducing the lineup and number of parts, and simplifying assembly work.

Such a rotating cylinder includes a cylinder body that is a rotating body, a piston that is slidably inserted in the cylinder body in the axial direction, and a rotating support that is a fixed body that rotatably supports the cylinder body inside. , a cover fixed to a rotating support body and covering one end side of the cylinder body, and a fluid supply path extending in the axial direction is bored in the center of the cylinder body, the rotating cylinder comprising: A rotary joint is provided for supplying fluid from the fixed body side to the rotating body side, the rotary joint includes a stationary side member and a rotating side member, the stationary side member is fitted to the cover, and the rotating side member is connected to one end of the cylinder body. The cover is fitted with the fixed side member facing the fixed side member, and the cover is provided with a fluid storage chamber at one end side of the fixed side member, and one end opens to the fluid storage chamber and the other end opens to the outer peripheral surface of the cover. A supply flow path is provided.

10 Cylinder body 12d Fluid supply path 20 Piston 60 Rotating support body 70 Rotary joint 71 Rotating side member 72 Fixed side member 80 Cover 100 Rotating cylinder A, B Channel D Supply channel E Drain channel m Fluid reservoir chamber n Drain chamber

Claims (2)

A cylinder body that is a rotating body,
a piston slidably inserted in the cylinder body in the axial direction;
a rotating support that is a fixed body and rotatably supports the cylinder body;
a cover fixed to the rotating support and covering one end side of the cylinder body;
Equipped with
A rotating cylinder in which a fluid supply passage extending in the axial direction is bored in the center of the cylinder body,
Built-in rotary joint that supplies fluid from the fixed body side to the rotating body side,
The rotary joint includes a stationary side member and a rotating side member,
The fixed side member is fitted to the other end side of the cover,
The rotating side member is fitted into the fluid supply path on one end side of the cylinder body so as to face the stationary side member,
The cover is provided with a fluid reservoir on one end side of the stationary side member, and is provided with a supply channel whose one end opens to the fluid reservoir chamber and the other end opens to the outer peripheral surface of the cover,
A drain chamber for collecting leaked fluid is provided in the vicinity of the cover covering one end side of the cylinder body ,
A drain channel is provided, one end of which opens into the drain chamber, and the other end of which opens into the outer circumferential surface of the cover.
rotating cylinder. The rotating cylinder according to claim 1,
The stationary side member is always biased toward the rotating side member by a biasing means,
The fixed side member and the rotating side member are always provided in a state of being in contact with each other either during rotation or non-rotation.

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