JP2018024046A - Rotary cylinder - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a rotary cylinder that prevents a cost increase by sharing a component when producing rotary cylinders the respective parts of the structures of which are different in specification.SOLUTION: A piston 3 is fitted in a slide hole 20 so as to be slidable, the slide hole being provided in the rotation center C1 of a cylinder body 2. The cylinder body 2 is provided with: a rotary disk part 2b the center axis of which coincides with the rotation center C1; and a cylinder chamber 10 formed in an inner part of the rotary disk part 2b and opening to the slide hole 20. The piston 3 is provided with a flange part 3b sectioning the cylinder chamber 10 into first and second spaces 10a, 10b. A first fluid outlet/inlet 12a lets fluid out/in a first space 10a. In the interior of a wall forming the outer peripheral edge part of the rotary disk part 2b, a check valve 5 is provided to block the first outlet/inlet 12a when the pressure of fluid passing through the first fluid outlet/inlet 12a has become lower than a set value.SELECTED DRAWING: Figure 4

Description

  The present invention relates to a rotating cylinder which is attached to a machine tool such as a lathe and rotatably supports a chuck device and performs a gripping operation or a gripping state releasing operation by the chuck device.

  Conventionally, for example, a rotating cylinder disclosed in Patent Document 1 includes a cylinder body having a slide hole at the center of rotation, a piston fitted into the slide hole so as to be slidable along the center of rotation, and the cylinder. A rotation support body that rotatably supports the main body via a bearing, and the cylinder main body is formed with a cylinder chamber that extends annularly around the rotation center and that opens to the slide hole. The piston includes an annular flange portion extending around the rotation center, and the flange portion is accommodated in the cylinder chamber and divides the cylinder chamber into first and second spaces along the rotation center. The outer peripheral wall of the cylinder body and the rotation support body has a first fluid inlet / outlet passage having one end opened in the first space and the other end opened in the outer circumferential surface of the rotation support body, and one end opened in the second space. And a second fluid inlet / outlet passage having the other end opened on the outer peripheral surface of the rotary support. The flange portion is formed with a through hole extending in parallel with the rotation center, and the first and second fluid inlet / outlet passages are blocked in the through hole when a power failure occurs. A check valve for preventing the fluid pressure in the chamber from dropping is slidably inserted. The check valve has a substantially rod shape extending along the rotation center, and both ends thereof are fixed to the inner peripheral surface forming the cylinder chamber of the cylinder body, and the piston is around the rotation center with respect to the cylinder body. It also plays a role in preventing it from rotating. And while flowing the fluid from the first fluid passage into the first space, while allowing the fluid to flow out from the second space into the second fluid passage, or flowing the fluid from the second fluid passage into the second space, By causing the fluid to flow out from the first space into the first fluid passage, the piston slides along the rotation center while the check valve slides into the through hole.

JP 2006-21313 A

  By the way, in recent years, there is a case where a part of the structure is made into a different specification in order to meet various customer requirements. However, in the rotating cylinder of Patent Document 1, for example, if the cylinder chamber capacity is changed and a product having a large cylinder sliding amount is to be commercialized, the width in the direction along the rotation center in the cylinder chamber becomes wide. Therefore, it is necessary to change the check valve to be long in the direction along the center of rotation so as to cope with it. Therefore, the check valve cannot be shared in each product, and the cost increases.

  The present invention has been made in view of the above points, and the object of the present invention is to prevent the cost from increasing by using common parts when manufacturing a rotating cylinder having a different structure. An object of the present invention is to provide a rotating cylinder that can be used.

  In order to achieve the above object, the present invention is characterized in that the arrangement of the check valve in the rotating cylinder has been devised.

  Specifically, a cylinder body having a slide hole at the center of rotation, a piston fitted in the slide hole so as to be slidable along the center of rotation, and the cylinder body are supported rotatably around the center of rotation. A rotation support body, and the cylinder body has a rotation disk portion having a center axis coinciding with the rotation center, formed inward of the rotation disk portion, and extends annularly around the rotation center, and the slide hole The piston has a flange portion that extends annularly around the rotation center and that is accommodated in the cylinder chamber and divides the cylinder chamber into first and second spaces. The piston is slid along the rotation center by putting fluid into and out of the first and second spaces in the cylinder body and the rotation support body. Intended for rotary cylinder body and out passage is provided, it took solving means as follows.

  That is, in the first invention, when the fluid pressure of the fluid passing through the fluid inlet / outlet passage is lower than a predetermined set value inside the wall forming the outer peripheral edge of the rotating disk portion, A check valve for closing the fluid in / out passage is provided.

  According to a second aspect, in the first aspect, the check valve is provided in a cylindrical valve case and an inner side of the valve case, and the fluid inlet / outlet passage is switched between an open state and a closed state. The valve case is provided so that a cylinder center line of the valve case extends in parallel with the rotation center.

  According to a third invention, in the first or second invention, the surface of the rotating disk portion forming the cylinder chamber is formed with a fitting insertion hole that opens in the extending direction of the center of rotation, and the flange portion has An attachment hole penetrating in the extending direction of the rotation center is formed, and an anti-rotation pin that is slidably fitted into the fitting insertion hole is fitted in the attachment hole.

  In the first invention, the check valve is positioned outside in the direction orthogonal to the rotation center in the cylinder chamber. Therefore, even if the width in the direction along the rotation center in the cylinder chamber changes, the check valve rotates accordingly. There is no need to change the length in the direction along the center. Therefore, when manufacturing a rotating cylinder having a specification with a part of the structure different, the structure of the check valve can be made common, and the cost can be prevented from increasing.

  In the second invention, since the thickness in the direction orthogonal to the rotation center of the wall forming the outer peripheral edge of the rotating disk part where the check valve is located can be reduced, the thickness in the direction orthogonal to the rotation center in the rotating disk part can be reduced. The dimensions are shortened, and the shape of the rotating cylinder can be made more compact.

  In the third aspect of the invention, the rotation of the piston around the rotation center of the piston relative to the cylinder body is not performed by the check valve as in Patent Document 1, but by the pin having a generally smaller outer shape than the check valve. It is possible to reduce the size of the mounting holes formed in the cylinder and the fitting insertion holes formed in the cylinder body, and the rigidity of the piston and the cylinder body can be increased.

It is sectional drawing of the rotation cylinder which concerns on embodiment of this invention. FIG. 2 is a view corresponding to FIG. 1 showing a state in which a piston is slidingly moved. It is sectional drawing in the III-III line of FIG. It is sectional drawing in the IV-IV line of FIG.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. The following description of the preferred embodiment is merely exemplary in nature.

  FIG. 1 shows a rotating cylinder 1 according to an embodiment of the present invention. The rotating cylinder 1 rotatably supports a chuck device (not shown) attached to a machine tool such as a lathe and performs a gripping operation or a releasing operation of the gripping state by the chuck device. A cylinder body 2 having a T-shape is provided.

  The cylinder body 2 includes a rotating shaft portion 2a having a cylindrical shape, a rotating disk portion 2b that is provided continuously to one end of the rotating shaft portion 2a, and whose center axis coincides with the cylinder center line of the rotating shaft portion 2a. And the center axis of the rotary shaft portion 2a and the central axis of the rotary disc portion 2b can be rotated around the rotation center C1.

  A slide hole 20 that opens at both ends is formed at the rotation center C1 of the cylinder body 2, and a cylinder that extends annularly around the rotation center C1 and opens at the slide hole 20 is formed at the rotary disk portion 2b. A chamber 10 is formed.

  A pair of insertion holes 20a that open in the extending direction of the rotation center C1 and face each other are formed on the surface of the rotating disk portion 2b that forms the cylinder chamber 10.

  A ring portion 2c projecting stepwise along the rotation center C1 is formed at a continuous portion of the outer peripheral surface of the rotating disk portion 2b with the outer peripheral surface of the rotating shaft portion 2a.

  Further, a ring-shaped stopper member 2d that protrudes in a direction orthogonal to the rotation center C1 and extends around the rotation center C1 is attached to the other end of the rotation shaft portion 2a, and the stopper member 2g is connected to the ring portion 2c. It is a position at a predetermined interval.

  Further, a pair of annular bearings B1 are provided between the ring portion 2c and the stopper member 2d and adjacent to the ring portion 2c and the stopper member 2d on the outer peripheral surface of the rotating shaft portion 2a. It is fitted to do.

  As shown in FIGS. 3 and 4, a pair of check valves 5 are provided symmetrically around the rotation center C1 inside the wall forming the outer peripheral edge of the rotating disk portion 2b.

  The check valve 5 includes a valve case 51 having a substantially cylindrical shape, and is provided such that a cylinder center line C2 of the valve case 51 extends in parallel with the rotation center C1.

  The valve case 51 includes a first case portion 51a having a substantially cylindrical shape and a second case portion 51b having a substantially cylindrical shape having a smaller diameter than the first case portion 51a.

  A partition wall 52 that partitions the internal space into a first fluid passage portion 51c and a second fluid passage portion 51d along the cylinder center line C2 is provided in the middle portion of the interior space of the first case portion 51a. A communication hole 52a is formed in the center of the partition wall 52 to allow the first fluid passage portion 51c and the second fluid passage portion 51d to communicate with each other.

  The first fluid passage portion 51c is fitted with approximately half of the second case portion 51b in the direction along the cylinder center line C2, and a sphere 53 is formed inside the second case portion 51b. It is accommodated so as to be movable along the cylinder center line C2.

  A coil spring 54 is provided on the inner side of the second case portion 51b to urge the spherical body 53 toward the partition wall 52 and to fit the periphery of the opening of the communication hole 52a.

  On the inner peripheral surface of the second fluid passage portion 51d, an annular step portion is formed between the two by passing the partition 52 side inner peripheral surface of the second fluid passage portion 51d so as to have a smaller diameter than the opening-side inner peripheral surface. 55 is formed.

  On the opening side of the second fluid passage portion 51d, a slide body 56 having a substantially T shape in a side view is slidably fitted along the cylinder center line C2, and the second fluid passage portion 51d is inserted into the second fluid passage portion 51d. The first partition space 57a on the partition wall 52 side and the second partition space 57b on the opening side are partitioned along the cylinder center line C2.

  The slide body 56 includes a disk portion 56a having a central axis coinciding with the cylinder center line C2, and a thin rod-like protrusion portion 56b projecting from the center of the disk portion 56a on the partition wall 52 side. When sliding toward the side 52, the protrusion 56b can press the sphere 53 against the urging force of the coil spring 54 to be separated from the communication hole 52a.

  One end of the rotating shaft portion 2a and the rotating disc portion 2b is connected to the first partition space 57a of one check valve 5, and the other end is opened in the middle of the outer peripheral surface of the rotating shaft portion 2a. A first fluid passage 58a and a second fluid passage 58b having one end connected to the first partition space 57a of the other check valve 5 and the other end opened in the middle of the outer peripheral surface of the rotary shaft portion 2a. Is formed.

  The rotating disk portion 2b has a third end connected to a first fluid passage portion 51c of one check valve 5 and the other end connected to a later-described first space 10a of the cylinder chamber 10. A fluid passage 58c and a fourth fluid passage 58d having one end connected to the first fluid passage portion 51c of the other check valve 5 and the other end connected to a later-described second space 10b of the cylinder chamber 10. Is formed.

  Further, the rotary disk portion 2b has a fifth fluid passage 58e having one end connected to the second partition space 57b of the other check valve 5 and the other end connected to a midway portion of the first fluid passage 58a. A sixth fluid passage 58f is formed in which one end is connected to the second partition space 57b of one check valve 5 and the other end is connected to the middle portion of the second fluid passage 58b.

  The piston 3 is fitted into the slide hole 20 so as to be slidable along the rotation center C1.

  As shown in FIGS. 1 and 2, the piston 3 has a cylindrical portion 3a whose cylinder center line coincides with the rotational center C1, and projects outward from the outer peripheral surface of the cylindrical portion 3a and around the rotational center C1. And a flange portion 3b extending annularly.

  The flange portion 3b is accommodated in the cylinder chamber 10 so that the cylinder chamber 10 extends in the extending direction of the rotation center C1 and the first space 10a is far from the rotation shaft portion 2a and the second space is closer to the rotation shaft portion 2a. It is divided into 10b.

  A lid cover 3c is attached to an end portion of the cylindrical portion 3a on the side away from the rotating disk portion 2b so as to close an opening portion of the end portion.

  The flange portion 3b is formed with a mounting hole 3e penetrating in the extending direction of the rotation center C1, and the rotation prevention pin 3d extending along the rotation center C1 is formed in the mounting hole 3e with the first space 10a. It fits so that it may each jump out to the 2nd space 10b.

  One end side of the anti-rotation pin 3d is slidably inserted into one of the both insertion insertion holes 20a, while the other end side of the anti-rotation pin 3d is slidable to the other of the both insertion insertion holes 20a. It is inserted. The one end side of the rotation prevention pin 3d is set to a length that does not come off from one of the fitting insertion holes 20a even when the piston 3 slides along the rotation center C1. On the other hand, the piston 3 is prevented from rotating around the rotation center C1.

  Around the rotation shaft portion 2a, there is provided a rotation support 4 that supports the rotation shaft portion 2a so as to be rotatable around the rotation center C1.

  The rotary support 4 includes an annular portion 41 whose center of inner diameter coincides with the rotation center C1, a vertically short liquid reservoir portion 44 attached to the lower portion of the annular portion 41, and the annular portion 41. And a cover member 45 that covers the other end side of the rotary shaft portion 2a and the lid cover 3c side of the piston 3, and the annular portion 41 is pivotally supported on the rotation center C1. It has a hole 41a.

  An annular wide portion 41b extending annularly around the rotation center C1 is formed in a portion corresponding to the space between the bearings B1 on the inner peripheral surface of the annular portion 41 forming the shaft support hole 41a. A minute gap is provided between the distal end surface of the portion 41b and the outer peripheral surface of the rotary shaft portion 2a.

  Both the bearings B1 are interposed between a portion excluding the annular wide portion 41b on the inner peripheral surface forming the shaft support hole 41a of the annular portion 41 and the outer peripheral surface of the rotary shaft portion 2a. The two cylinders B1 rotate the cylinder body 2 around the rotation center C1 with respect to the rotation support 4.

  An annular first groove portion 41c and a second groove portion 41d extending around the rotation center C1 are juxtaposed on the front end surface of the annular wide portion 41b, and the first groove portion 41c is connected to the other end of the first fluid passage 58a. The second groove 41d corresponds to the other end of the second fluid passage 58b.

  On one side surface of the annular portion 41, a first communication portion 42a that opens to the outer peripheral surface and communicates with the first groove portion 41c, and a second communication portion 43a that opens to the outer peripheral surface and communicates with the second groove portion 41d. And are formed.

  The first communication portion 42a, the first groove portion 41c, the first fluid passage 58a, the third fluid passage 58c, the fifth fluid passage 58e, the first partition space 57a and the first fluid passage portion in one check valve 5. 51c and the communication hole 52a of one check valve 5 constitute the first fluid inlet / outlet passage 12a of the present invention, while the second communication portion 43a, the second groove portion 41d, the second fluid passage 58b, The fourth fluid passage 58d, the sixth fluid passage 58f, the first partition space 57a in the other check valve 5, the first fluid passage 51c, and the communication hole 52a in the other check valve 5 are the second fluid access passage of the present invention. 12b is configured.

  When the fluid is moved toward the first space 10a in the first fluid passage 58a, the fluid that has flowed into the first partition space 57a resists the urging force of the coil spring 54 in one check valve 5. The spherical body 53 is pressed to open the communication hole 52a. After the fluid has moved to the first fluid passage 51c through the communication hole 52a (arrow X1 in FIG. 4), the third fluid passage 58c is moved through the third fluid passage 58c. It passes through and flows into the first space 10a. Further, when moving the fluid toward the first space 10a in the first fluid passage 58a, the fluid branches and flows into the fifth fluid passage 58e and flows into the second partition space 57b of the other check valve 5. Then, the slide body 56 is pressed against the partition wall 52 side, and the protruding portion 56b presses the sphere 53 against the urging force of the coil spring 54 by the sliding operation toward the partition wall 52 side by the pressed slide body 56. Thus, the communication hole 52a is opened. Then, the fluid in the second space 10b moves to the fourth fluid passage 58d, flows into the first fluid passage portion 51c of the other check valve 5, and moves to the first partition space 57a through the communication hole 52a. After (arrow X2 in FIG. 4), the piston 3 slides to one side along the rotation center C1 by passing through the second fluid passage 58b.

  Further, when the fluid pressure of the fluid moving toward the first space 10a in the first fluid passage 58a becomes lower than a predetermined set value, the force by which the fluid presses the sphere 53 in one check valve 5 is increased. By weakening, the sphere 53 is moved by the urging force of the coil spring 54 and the communication hole 52a is closed. On the other hand, in the other check valve 5, the force by which the projection 56b of the slide body 56 presses the sphere 53 is weakened. The spherical body 53 is moved by the urging force of 54 and the communication hole 52a is closed, and the fluid does not enter and exit from the first space 10a and the second space 10b, and the first and second spaces 10a. , 10b is maintained.

  On the other hand, when the fluid is moved toward the second space 10b in the second fluid passage 58b, the fluid flowing into the first partition space 57a in the other check valve 5 resists the biasing force of the coil spring 54. The spherical body 53 is pressed to open the communication hole 52a. After the fluid moves to the first fluid passage 51c through the communication hole 52a, the fluid passes through the fourth fluid passage 58d and passes through the second fluid passage 58d. It flows into the space 10b. Further, when the fluid is moved toward the second space 10b in the second fluid passage 58b, the fluid branches and flows into the sixth fluid passage 58f and flows into the second partition space 57b of one check valve 5. Then, the slide body 56 is pressed against the partition wall 52 side, and the protruding portion 56b presses the sphere 53 against the urging force of the coil spring 54 by the sliding operation toward the partition wall 52 side by the pressed slide body 56. Thus, the communication hole 52a is opened. Then, the fluid in the first space 10a moves to the third fluid passage 58c and flows into the first fluid passage portion 51c of one check valve 5 and also moves to the first partition space 57a through the communication hole 52a. Then, the piston 3 slides to the other side along the rotation center C1 by passing through the first fluid passage 58a.

  Further, when the fluid pressure of the fluid moving toward the second space 10b in the second fluid passage 58b becomes lower than a predetermined set value, the force by which the fluid presses the sphere 53 in the other check valve 5 is increased. By weakening, the sphere 53 is moved by the urging force of the coil spring 54 and the communication hole 52a is closed. On the other hand, in one check valve 5, the force by which the projection 56b of the slide body 56 presses the sphere 53 is weakened. The spherical body 53 is moved by the urging force of 54 and the communication hole 52a is closed, and the fluid does not enter and exit from the first space 10a and the second space 10b, and the first and second spaces 10a. , 10b is maintained.

  Thus, the communication hole 52a, the spherical body 53, the coil spring 54, and the slide body 56 in each check valve 5 constitute the opening / closing switching means 11 of the present invention, and the first fluid inlet / outlet passage 12a and the second fluid inlet / outlet. The passage 12b can be switched between an open state and a closed state.

  As described above, according to the embodiment of the present invention, the check valve 5 is positioned outside in the direction perpendicular to the rotation center C1 in the cylinder chamber 10, so that the width in the direction along the rotation center C1 in the cylinder chamber 10 changes. However, it is not necessary to change the length of the check valve 5 in the direction along the rotation center C1. Therefore, when manufacturing the rotating cylinder 1 having a partly different structure, the structure of the check valve 5 can be shared, and the cost can be prevented from increasing.

  Further, the valve case 51 has a posture in which the cylinder center line C2 of the valve case 51 extends in parallel with the rotation center C1, and therefore, the wall of the wall forming the outer peripheral edge of the rotating disk portion 2b where the check valve 5 is located. The thickness in the direction orthogonal to the rotation center C1 can be reduced, the dimension in the direction orthogonal to the rotation center C1 in the rotating disk portion 2b is shortened, and the shape of the rotating cylinder 1 can be made compact.

  Furthermore, the rotation prevention around the rotation center C1 of the piston 3 with respect to the cylinder body 2 is not performed by the check valve as in Patent Document 1, but by the rotation prevention pin 3d whose outer shape is generally smaller than that of the check valve. The mounting hole 3e formed in the flange portion 3b and the fitting insertion hole 20a formed in the cylinder body 2 can be reduced, and the rigidity of the piston 3 and the cylinder body 2 can be increased.

  The present invention is suitable for a rotary cylinder that is attached to a machine tool such as a lathe and rotatably supports a chuck device and performs a gripping operation or a gripping state releasing operation by the chuck device.

DESCRIPTION OF SYMBOLS 1 Rotating cylinder 2 Cylinder main body 2b Rotating disk part 3 Piston 3b Flange part 3d Anti-rotation pin 3e Mounting hole 4 Rotating support body 5 Check valve 10 Cylinder chamber 10a 1st space 10b 2nd space 11 Opening / closing switching means 12a 1st fluid access path 12b Second fluid inlet / outlet passage 20 Slide hole 20a Fitting hole 51 Valve case C1 Center of rotation C2 Center line of cylinder

Claims (3)

A cylinder body having a slide hole at the center of rotation;
A piston slidably inserted into the slide hole along the rotation center;
A rotation support that rotatably supports the cylinder body around the rotation center;
The cylinder body has a rotating disk portion whose central axis coincides with the rotation center, and a cylinder chamber formed inward of the rotating disk portion and extending annularly around the rotation center and opening to the slide hole. Provided,
The piston is provided with a flange portion that extends annularly around the rotation center and is accommodated in the cylinder chamber and divides the cylinder chamber into first and second spaces,
The cylinder main body and the rotary support are provided with a fluid cylinder passage that slides the piston along the center of rotation by putting fluid into and out of the first and second spaces,
A check valve that closes the fluid inlet / outlet passage when the fluid pressure of the fluid passing through the fluid inlet / outlet passage is lower than a predetermined set value is provided inside the wall forming the outer peripheral edge of the rotating disk portion. A rotating cylinder is provided. The rotating cylinder according to claim 1,
The check valve includes a cylindrical valve case, and an opening / closing switching means provided inside the valve case and capable of switching the fluid inlet / outlet passage between an open state and a closed state,
The rotary cylinder according to claim 1, wherein the valve case is provided so that a cylinder center line of the valve case extends in parallel with the rotation center. The rotary cylinder according to claim 1 or 2,
On the surface of the rotating disk part forming the cylinder chamber, a fitting insertion hole that opens in the extending direction of the rotation center is formed,
The flange portion is formed with a mounting hole penetrating in the extending direction of the rotation center,
A rotation cylinder, wherein an anti-rotation pin that is slidably fitted into the fitting hole is fitted in the mounting hole.

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