JPWO2009016940A1 - Locking device - Google Patents

Abstract

A locking device (1) attached to the casing 15 of the fluid pressure rotary actuator (10) to lock the rotation shaft (11) of the fluid pressure rotary actuator (10) having the rotation shaft (11). 11) The sleeve (14) fitted to the end of the case, the case main body (2) having the key-shaped opening, and the case main body (2) arranged to tighten the outer periphery of the sleeve (14). A coil spring (7) and a release actuator (8) for releasing the lock are provided, and the cover plate (3) is fitted on the back surface of the case body (2).

Description

  The present invention relates to a lock device that locks a rotating shaft of a fluid pressure rotary actuator, for example, and more particularly to a lock device that can be reduced in size and can be manufactured at low cost.

2. Description of the Related Art Conventionally, as a device that locks a piston rod of a fluid pressure cylinder, for example, a lock device that operates using fluid pressure as described in Patent Document 1 is known. In this locking device, a locking cylinder is provided at the end of the fluid pressure cylinder, and a locking insertion portion is protruded from the locking piston fitted in the locking cylinder, so that the end of the piston rod of the fluid pressure cylinder is provided. When the piston rod of the fluid pressure cylinder is moved to the end, the sleeve with the steel rod of the piston rod is inserted into the locking piston lock, and the piston rod is locked and locked. When releasing the lock, the lock piston is released by moving the locking piston in the unlocking direction by fluid pressure.
JP 2002-213410 A JP 2006-226522 A Japanese Utility Model Publication No. 58-108603

  However, this type of conventional locking device has a structure that uses a fluid pressure to drive and lock the locking piston, which complicates the structure, increases the number of parts, increases the number of parts, and increases the manufacturing cost. There was a problem of inviting an increase. Furthermore, since locking or unlocking operation is performed using fluid pressure, it is necessary to connect a piping for fluid for operation. There was a problem that it was difficult to install.

  In addition to the locking device described above, a locking mechanism that rotates and locks an eccentric locking member, a locking mechanism that uses a wedge-shaped locking member, a locking mechanism that uses a swash plate, or an internal stress The lock mechanism used is known, but any locking device is structured to lock by the force-increasing mechanism or by the biting of the lock member, so a large force is required for the unlocking operation when releasing the lock. For this reason, there is a problem that the lock mechanism is enlarged and complicated, and the number of parts is increased.

  Therefore, the present inventors have proposed a locking device in Patent Document 2 in which a coil spring is externally fitted to a locked rod, and the locked rod is tightened and locked by the spring force of the coil spring. In this locking device, a coil spring is disposed in a case, one end of the coil spring is fixed to the case and the other end is disposed in a free state, and a locked rod is tightened inside the coil spring by the spring force of the coil spring. The other end of the coil spring is pushed or pulled in the direction of opening the coil spring by the unlocking actuator to release the lock.

  This locking device can be manufactured at low cost with a simple structure, can be made relatively small, and can be locked and unlocked smoothly by the operation of the unlocking actuator, but the unlocking actuator Is disposed in the case, and the length from the winding portion of the coil spring to the free tip portion is relatively short. For this reason, the length of the moment of force acting on the tip when releasing the lock is shortened, and it becomes necessary to attach a large actuator with relatively large power to the unlocking actuator, and the manufacturing cost is high. There was a problem that the outer shape of the locking device was also increased.

  Further, in the prior art, there is a lock device in which a pair of coil springs wound in mutually opposite directions are externally fitted to a piston rod of a pneumatic cylinder, and the piston rod is tightened and locked by the spring force of the coil spring. Is known by.

  In this locking device, a bush having an inclined protrusion is attached in the case, a release lever is rotatably disposed in the case, and an outer end portion of a pair of coil springs externally fitted to a piston rod is provided. It fixes to the inclination protrusion part of a bush, the inner edge part of a pair of coil spring is fixed to the base part of a release lever, and the front-end | tip of a release lever is made to protrude outside a case. An electromagnetic solenoid for unlocking is attached to the outside of the case. The tip of the release lever is pushed and rotated by the electromagnetic solenoid, and the end of the coil spring is moved in the direction to release the tightening force due to the spring force of the coil spring (opening direction). It is a structure that pushes and releases the lock.

  However, the locking device disclosed in Patent Document 3 has a pair of coil springs wound in directions opposite to each other fitted on the piston rod of the pneumatic cylinder, and the piston rod is tightened and locked by the spring force of the coil spring. Because of this structure, if this locking device is applied to a locking device that locks the rotating shaft of a fluid pressure rotary actuator, the rotating shaft will rotate in the anti-winding direction of the coil spring (regardless of the use of two coil springs). When rotating in the rewinding direction), the tightening force of the coil spring cannot be sufficiently applied to the rotating shaft, and it is difficult to reliably lock the rotation of the rotating shaft.

  Further, in the lock device of Patent Document 3, an electromagnetic solenoid for unlocking is disposed on the outside of the case and operates by releasing the tip of a release lever protruding from the case, so that it acts on the tip when releasing the lock. Although the length of the moment of the force is relatively long, it is necessary to install a large electromagnetic solenoid with high power to push the release lever in the direction to release the tightening force of the two coil springs to release the lock. In addition, there is a problem that the manufacturing cost is increased and the outer shape of the lock device is increased. In addition, a pair of coil springs, collars, and release levers are attached to the case together with the bushes, which increases the number of parts and requires assembly work to fix the inner end of the coil spring to the release lever. There is a problem that the number of work steps at the time of assembly is large and the manufacturing cost is high.

  The present invention has been made in view of the above points, and a lock that can use a smaller release actuator, has a small number of parts, is small in size, has a simple structure, and can reduce manufacturing costs. An object is to provide an apparatus.

For this purpose, the locking device according to claim 1 of the present invention is a locking device attached to a casing of the rotary actuator to lock the rotary shaft of the rotary actuator having the rotary shaft,
A sleeve fitted to the end of the rotating shaft;
A case body fixed to the casing of the rotary actuator so as to surround the sleeve and having a key-shaped opening;
The key-shaped opening is disposed in the center of the key-shaped opening, is fitted onto the sleeve so as to tighten the outer periphery of the sleeve, the end is fixed to the case body, and the tip is free. A coil spring arranged to protrude outward from
A release that is attached to the outside of the case body and releases the lock by releasing the tightening force of the coil spring against the sleeve by pushing or pulling the tip of the coil spring in the circumferential direction to open the coil spring. Actuator for
The coil spring is inserted into the central portion of the key-shaped opening in the case body, and a cover plate is fitted into the back surface of the case body, and the end portion of the coil spring is connected to the back surface of the case body. A cover plate is fitted into and fixed to the case body so as to be sandwiched and fixed between the cover plate and the case main body, and the case main body is fastened and fixed to the front surface of the rotary actuator by a mounting screw. The winding direction as viewed from the side is set in a direction opposite to the rotation direction that requires locking of the rotary shaft of the rotary actuator.

  According to this invention, the rotation of the rotary shaft of the rotary actuator can be effectively locked by the lock device having a very small number of parts including only the case main body, the coil spring, the cover plate, and the release actuator. Thus, the manufacturing cost of the lock device can be reduced and the device can be downsized.

  In addition, the coil spring is disposed so that the tip portion is in a free state and protrudes outward from the key-shaped opening, and the release actuator is attached to the outside of the case body, so that the free spring that protrudes outward from the winding portion of the coil spring The distance to the tip can be increased. For this reason, the length of the moment of the force that pushes or pulls in the circumferential direction that opens the coil spring that the release actuator acts on the tip of the coil spring becomes longer, and the driving force of the release actuator that applies the moment force is increased. The release actuator can be reduced in size.

  Here, in the locking device having the above-described configuration, the release actuator can be attached to the outside of the case body via a mounting plate, or the release actuator can be directly attached to the outer surface of the case body. .

  According to the present invention, it is easy to replace the release actuator, and it is possible to attach release actuators with different driving forces to release different brake forces using a common case body. A locking device having force can be manufactured at low cost.

  Further, the end portion of the coil spring is inserted into a spring end fitting hole provided in a part of the case body, and the cover plate is fitted into the back surface of the case body to fix the cover plate, so that the end portion of the coil spring becomes the cover plate. And the case main body can be sandwiched and fixed.

  According to this invention, at the time of manufacture, the coil spring can be assembled very easily in the case body, and the lock device can be manufactured with a very small number of work steps.

  Further, as the coil spring, a plurality of types of coil springs having the same winding inner diameter and different wire rod outer diameters can be prepared, and the plurality of types of coil springs can be replaced to change the braking force. .

  Further, as the coil spring, a plurality of types of coil springs having slightly different winding inner diameters may be prepared, and the plurality of types of coil springs may be replaced to change the braking force.

  According to the present invention, a lock device for a rotary actuator having various rated outputs can be manufactured at low cost using common parts.

  The release actuator has a piston rod that can be pushed out, and the tip of the piston rod engages with the tip of the coil spring protruding from the key-shaped opening of the case body. It can be configured to release the tightening force by urging the part in the opening direction.

  Further, the cover plate is fitted and fixed in a recess formed on the back surface of the case body, and the mounting surface of the case body with respect to the rotary actuator is set on both the cover plate side and the anti-cover plate side, When attaching the case body to the casing of the rotary actuator, by changing the mounting surface on the cover plate side or the anti-cover plate side to change the winding direction of the coil spring with respect to the rotation axis of the rotary actuator, The rotation lock direction of the rotary actuator can be set.

  According to the present invention, a lock device can be applied to a rotary actuator having a different rotation lock direction of the rotary shaft by simply changing the mounting side of one type of lock device. In other words, for rotary actuators with different rotation directions that require the rotation axis of the rotary actuator to be locked, simply use the common parts for each member and simply reverse the mounting surface of each member. Manufacturing costs can be reduced.

  Furthermore, in the lock device having the above-described configuration, two lock device units including the case main body, the cover plate, the coil spring, the mounting plate, and the release actuator may be arranged on the cover plate side or the casing of the rotary actuator. Installed in series with different mounting surfaces on the side opposite to the cover plate, the coil springs of the two locking device units having different winding directions are connected in series, and fitted to the tip of the rotary shaft of the rotary actuator. The formed sleeve is inserted into the inside of the two coil springs, and the rotation lock direction of the rotation shaft of the rotary actuator can be configured to be both directions.

  According to this invention, it is possible to lock both rotation directions of the rotary shaft of the rotary actuator by simply attaching one type of locking device unit in the opposite direction to the casing of the rotary actuator in series. Since the apparatus is manufactured using common parts, the number of parts is small, the number of assembling steps is small, and the manufacturing cost can be reduced.

  Thus, according to the locking device of the present invention, the rotating shaft of the rotary actuator can be locked using a smaller release actuator, the number of parts is small, the structure is small, the structure is simple, and the manufacturing is low. A locking device with high performance can be manufactured at low cost.

It is a front view of the locking device and fluid pressure rotation actuator which show one embodiment of the present invention. It is II-II sectional drawing of FIG. It is a front view of a locking device. It is a right view of a locking device. It is a perspective view of a locking device. It is VI-VI sectional drawing of FIG. It is VII-VII sectional drawing of FIG. It is a decomposition | disassembly partial sectional view of a locking device. It is a rear view of a locking device. It is a right view of a locking device. It is XI-XI sectional drawing of FIG. It is XII-XII sectional drawing of FIG. It is a front view of the locking device and fluid pressure rotation actuator which show other embodiments. It is XIV-XIV sectional drawing of FIG. It is a perspective view of the locking device which shows other embodiment. It is a locking device perspective view showing another embodiment. It is XVII-XVII sectional drawing of FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Locking device 2 Case main body 2a Key type opening part 3 Cover plate 4 Spring end insertion hole 7 Coil spring 7a Tip part 7b Tip protrusion part 7c End part 8 Release actuator 8c Piston rod 9 Mounting plate 10 Fluid pressure rotary actuator 14 Sleeve 15 casing

  Hereinafter, an embodiment of the present invention will be described with reference to the drawings. FIG. 1 shows a front view of a locking device 1 that locks a rotary shaft 11 of a fluid pressure rotary actuator 10 as a locked rod, and FIG. 2 shows a cross-sectional view thereof. The locking device 1 is attached to the front surface of the casing 15 so as to lock the tip of the rotating shaft 11 of the fluid pressure rotary actuator 10. A sleeve 14 is fitted to the protruding tip of the rotary shaft 11, and the case body 2 of the lock device 1 is formed so as to surround the sleeve 14, and is attached to the front surface of the fluid pressure rotary actuator 10. A coil spring 7 for locking is mounted in the case body 2.

  As shown in FIGS. 1 and 2, the fluid pressure rotary actuator 10 has a pressure chamber 13 formed in a casing with a front face being substantially fan-shaped, and the rotary shaft 11 is inserted into the pressure chamber 13 at a substantially central position of the fan. A rectangular vane 12 is pivotally mounted on the rotary shaft 11 in the pressure chamber 13 so as to be rotatable about the rotary shaft 11 within a range of about 90 °. Ports are provided on both side walls of the pressure chamber 13 separated by the vane 12, and fluid pressure is applied to either side of the pressure chamber 13 through each port, whereby rotational force acts on the vane 12 to rotate. The shaft 11 reciprocates in the range of about 90 °.

  As shown in FIGS. 1 and 2, the case main body 2 of the lock device 1 has an end portion (a portion where the sleeve 14 is externally fitted) of the rotary shaft 11 on the front side of the casing 15 of the fluid pressure rotary actuator 10. Fixed to enclose. Mounting holes are drilled at four corners of the case body 2 at positions corresponding to mounting screw holes provided in the casing 15 of the fluid pressure rotary actuator 10, and mounting screws 21 are inserted into the mounting holes. The tip of 21 is screwed into the screw hole and fixed. As described above, if the screw holes are provided on the front side of the casing 15 of the fluid pressure rotary actuator 10 so as to correspond to the mounting holes at the four corners of the case body 2, the locking device 1 is also provided to the existing fluid pressure rotary actuator 10. Can be attached relatively easily.

  The locking device 1 is configured as shown in FIGS. 3 to 12, and the surface shown in FIG. 3 is the front surface, the surface shown in FIG. 9 is the back surface, and the front surface in FIG. 3 or the back surface in FIG. This structure can be attached to the pressure rotary actuator 10. A key-shaped opening 2a including a circular opening is formed in the center of the case body 2 of the locking device 1 in front view or rear view, and one coil spring 7 is disposed in the circular opening. . When the lock device 1 is mounted, the coil spring 7 is fitted on the outer periphery of the sleeve 14 fitted to the end of the rotary shaft 11 of the fluid pressure rotary actuator 10 serving as a locked rod so as to be tightened.

  The coil spring 7 is formed by winding a spring metal wire (for example, a piano wire) in a coil shape, and a tip protruding portion 7b including a tip portion 7a of the coil spring 7 has a rotating shaft on the outer side from the coil winding portion. 11 is bent and protrudes in a radial direction perpendicular to the axial direction, and protrudes outside the key-shaped opening 2a. The tip 7a of the coil spring 7 is engaged with the tip of the piston rod 8c of the unlocking actuator 8 for unlocking. The release actuator 8 is attached to the upper portion of the case body 2 via a mounting plate 9, and the tip end 7 a of the coil spring 7 for locking is connected to the coil spring 7 at the tip of the piston rod 8 c of the release actuator 8. It is set as the structure which can be pressed in the direction (right direction of FIG. 1) which opens winding.

  Although not shown in the figure, the tip protruding portion 7b of the coil spring 7 is pressed against the upper portion of the case body 2 in the tightening direction of the coil spring 7 (the return direction of the release actuator 8 in the left direction in FIG. 1). A return spring (coil spring) can be provided. By this return spring, the piston rod 8c of the release actuator 8 is always urged in the return direction, and rattling of the piston rod of the release actuator 8 can be prevented.

  That is, the return spring always pushes the piston rod 8c of the release actuator 8 in the return direction with the tip 7a of the lock coil spring 7 and urges the lock coil spring 7 in the tightening direction. The spring force of the return spring may be a weak coil spring that can return the unlocking release actuator 8 to the unlocked state, and if the piston rod 8c of the release actuator 8 has a biasing means for pulling back. A return spring is not required.

  The release actuator 8 is attached to the upper portion of the case body 2 via the attachment plate 9. As shown in FIG. 3, the mounting plate 9 is vertically attached to the left side surface of the case body 2 by a mounting screw 23, and the release actuator 8 is fixed to the mounting plate 9 on the back surface thereof, and the axial direction of the coil spring 7 It attaches so that piston rod 8c may be arranged at right angles to it. An engagement portion is provided at the tip of the piston rod 8c of the release actuator 8, and the tip portion 7a of the coil spring 7 is engaged with the engagement portion.

  When the release actuator 8 pushes out the piston rod 8c, the engaging portion at the tip of the piston rod 8c pushes the tip 7a of the coil spring 7 in the opening direction (the right direction in FIG. 3), and is covered by the coil spring 7. Unlock the lock rod. On the other hand, the end portion 7c of the coil spring 7 is bent at a substantially right angle so as to protrude outward from the circumferential portion in order to fix the coil spring 7, and is inserted into a spring end insertion hole 4 provided in the lower portion of the case body 2. Is done. Then, as shown in FIG. 7, when the cover plate 3 is fitted and fixed in the plate-like recess on the back surface of the case body 2, the end portion 7 c of the coil spring 7 is sandwiched between the cover plate 3 and the case body 2. To be fixed.

  The inner diameter of the coil spring 7 is formed to be slightly smaller than the outer diameter of the sleeve 14 serving as a locked rod. When the sleeve 14 is directly inserted into the coil spring 7, the rotating shaft 11 is tightened by the coil spring 7. The rotating shaft 11 is locked. In particular, the rotation in one direction of the rotary shaft 11 (the anti-winding direction (counterclockwise direction in FIG. 3) viewed from the tip 7a side of the coil spring 7) is completely locked. On the other hand, the rotation of the rotating shaft 11 in the other direction (the winding direction as viewed from the tip 7a of the coil spring 7 (clockwise direction in FIG. 3)) is locked, but is locked compared to the rotation lock in the winding direction. Power is relatively weak. For example, when the outer diameter of the sleeve 14 is 10 mm, the inner diameter of the coil spring 7 is set to 9.75 mm, and the difference between the inner diameter of the coil spring 7 and the outer diameter of the sleeve 14 is about 25 / It is set to about 1000.

  When the coil spring 7 is attached to the case body 2, as shown in FIG. 8, the coil spring 7 is inserted into the key opening 2a of the case body 2 from the back surface (the side where the plate-like recess is formed) of the case body 2. The end portion 7c is inserted into the spring end insertion hole 4, and the annular cover plate 3 is fitted into the back surface of the case body 2 in this state. Then, the cover plate 3 is fixed to the back surface of the case body 2 using the three fixing screws 22.

  As a result, the coil spring 7 is mounted at a fixed position in the case main body 2, and the distal end portion 7 a of the coil spring 7 protrudes above the case main body 2. As described above, the release actuator 8 has a mounting plate 9 fixed to the left side surface of the case main body 2 with a mounting screw so as to face upward, and a portion protruding above the mounting plate 9 in the horizontal direction (coil spring 7 It is attached with the direction perpendicular to the axial direction of

  Since the release actuator 8 is attached and arranged outside the case body 2, the length H (FIG. 3) of the tip protrusion 7b of the coil spring 7 is set when the release actuator is disposed in the case body. It can be made longer. As a result, the load component of the moment applied to the tip 7a of the coil spring 7 when releasing the lock is reduced, and the force applied to the tip 7a of the coil spring 7 when releasing the lock can be further reduced. For this reason, a small release actuator can be used. Further, the shape of the case main body 2 can be reduced in size, and the release actuator 8 is attached to the outside of the case main body 2 so that the replacement and repair can be easily performed.

  The tip of the piston rod 8c of the release actuator 8 is engaged with the tip 7a of the coil spring 7 protruding upward from the case body 2, and when the release actuator 8 pushes out the piston rod 8c, the coil spring 7 is The sleeve 14 is biased in the counter-tightening direction.

  A fluid pressure cylinder is used as the release actuator 8. The piston 8 b is fitted into the cylinder 8 a, and the tip of the piston rod 8 c connected to the piston 8 b is engaged with the tip 7 a of the coil spring 7. The A fluid pressure conduit is connected to the port of the cylinder 8a of the release actuator 8.

  Next, the operation of the locking device having the above configuration will be described. As shown in FIGS. 1 and 2, the lock device 1 having the above configuration is mounted on the front surface of the fluid pressure rotary actuator 10 using four mounting screws 21. The locking device 1 is in a brake-on state, that is, in a locked state during normal operation, that is, when the release actuator 8 is not operated, and a tightening force is applied to the sleeve 14 of the rotating shaft 11 by the tightening spring force of the coil spring 7. The rotation of the fluid pressure rotary actuator 10 is locked.

  In particular, the counterclockwise rotation in FIG. 1 (rotation in the counterwinding direction of the coil spring 7) is strongly locked, and the clockwise rotation acts in the direction in which the coil spring 7 is opened. It can be rotated by torque. That is, the rotating shaft 11 rotates in the anti-winding direction of the coil spring 7 even when the tightening spring force of the coil spring 7 is relatively small (the coil spring from the front to the back in the front view of the coil spring 7 in FIG. 1). The rotation in the direction opposite to the winding direction, that is, the twisting direction of the tip 7a of the coil spring 7 is locked with a high braking force.

  The fluid pressure rotary actuator 10 is used, for example, when a driven rotary member such as an arm or a lever is reciprocatingly driven. When the driven rotary member is not energized, the fluid pressure rotary actuator 10 is natural. The locking device is used to prevent it from rotating when it rotates. At this time, the locking device is attached so that the locking direction (the twisting direction of the coil spring 7 toward the distal end portion 7 a) matches the free rotation direction of the fluid pressure rotary actuator 10.

  As a result, the lock device 1 can be applied with a braking force generated by the tightening force of the coil spring 7 by a small device when the rotating shaft 11 of the fluid pressure rotary actuator 10 is not energized (when no fluid pressure is applied). One-way rotation can be strongly locked. Thus, since the lock device 1 is locked when the actuator is not operated, the lock device 1 can be effectively used as a fail-safe device during an emergency stop or the like.

  When releasing the lock, fluid pressure is applied to the release actuator 8 to push out the piston rod 8c. At this time, the piston rod 8c of the release actuator 8 causes the tip 7a of the coil spring 7 to open the coil, that is, in the winding direction of the coil spring from the front to the back in the front view of the coil spring 7 in FIG. Yes, the tip portion 7a is pushed in the anti-twist direction (right direction in FIG. 1) of the tip portion 7a of the coil spring 7. As a result, the tightening force of the coil spring 7 on the sleeve 14 of the rotary shaft 11 disappears, the lock of the rotary shaft 11 is released, and the fluid pressure rotary actuator 10 can rotate.

  On the other hand, when the rotary shaft 11 of the fluid pressure rotary actuator 10 is locked, when the piston rod 8c of the release actuator 8 is pulled back, the tip 7a of the coil spring 7 returns to the left, and the coil spring 7 is moved by the spring force. The sleeve 14 of the rotating shaft 11 is tightened to return to the locked state.

  In this manner, the coil spring 7 is disposed so that the distal end portion 7 a is in a free state and protrudes outward from the key-shaped opening 2 a, and the release actuator 8 is attached to the outside of the case body 2 via the attachment plate 9. Therefore, the distance (the length H of the tip protrusion 7b shown in FIG. 3) from the winding portion of the coil spring 7 to the free tip 7a protruding outward can be increased. For this reason, the length of the moment of the force of pushing or pulling in the circumferential direction that opens the coil spring that the release actuator 8 acts on the tip 7a of the coil spring 7 becomes longer, and the release actuator 8 that applies the moment force The driving force can be reduced. Thereby, the actuator 8 for cancellation | release can be reduced in size and the lock apparatus 1 whole can be reduced in size.

  13 and 14 show another embodiment using the locking device 1 described above. In this example, as shown in FIG. 13, contrary to the above, the locking device 1 is configured so that a strong braking force is generated against the rotational force of the rotating shaft 11 of the fluid pressure rotary actuator 10 rotating clockwise. It is attached. For this reason, the locking device 1 is configured so that the surface opposite to the cover plate 3 fitted to the back surface of the case body 2 is rotated by the fluid pressure rotation of the case body 2, contrary to the example of FIGS. 1 and 2 described above. The case main body 2 of the locking device 1 is attached and fixed to the front surface of the casing of the fluid pressure rotary actuator 10 by using the mounting surface as the mounting surface for the actuator 10.

  That is, the locking device 1 is attached to the fluid pressure rotary actuator 10 by using the opposite surface of the cover plate 3 as the mounting surface and placing it on the front surface of the casing of the fluid pressure rotary actuator 10 so that the four mounting screws 21 are attached to the case body. 2 is inserted into the mounting hole 2b of the actuator 2 and screwed into the mounting screw hole of the actuator casing 15, and the locking device 1 is fixed to the front surface of the casing 15 in the opposite direction.

  As a result, as shown in FIG. 13, the winding direction of the coil spring 7 around the sleeve 14 (the tightening direction by winding the coil spring) is the clockwise direction opposite to that in FIG. The tightening force of the eleventh sleeve 14 is opposite to the example of FIGS. 1 and 2, that is, the rotational force in the clockwise direction of FIG. Thus, it is possible to cope with both rotation directions of the rotary shaft 11 of the fluid pressure rotary actuator 10 to be attached only by changing the attachment surface (attachment direction) of the lock device 1 having the same structure.

  When releasing the lock, the piston rod 8c is pushed out by applying fluid pressure to the release actuator 8 in the same manner as described above. At this time, the piston rod 8c of the release actuator 8 moves the tip 7a of the coil spring 7 in the direction to open the coil, that is, in the winding direction of the coil spring from the front to the back in the front view of the coil spring 7 in FIG. Yes, the distal end portion 7a is pushed in the counter-twisting direction (leftward and counterclockwise in FIG. 13) of the distal end portion 7a of the coil spring 7. As a result, the tightening force of the coil spring 7 on the sleeve 14 of the rotary shaft 11 disappears, the lock of the rotary shaft 11 is released, and the fluid pressure rotary actuator 10 can rotate.

  On the other hand, when the rotary shaft 11 of the fluid pressure rotary actuator 10 is locked, when the piston rod 8c of the release actuator 8 is pulled back in the same manner as described above, the tip end portion 7a of the coil spring 7 returns to the right, and the coil spring 7 However, due to the spring force, the sleeve 14 of the rotating shaft 11 is tightened to return to the locked state.

  FIG. 15 shows a locking device according to another embodiment. In this example, the release actuator 28 is directly attached to the upper surface of the case body 2. The release actuator 28 is formed to have a somewhat vertically long rectangular parallelepiped casing 28a, and the bottom surface of the casing 28a is directly brought into contact with one side of the upper surface of the case body 2 so as to be drilled in the casing 28a. The mounting screw 28d is inserted into the hole, and the tip of the mounting screw 28d is screwed into the screw hole of the case body 2 of the locking device, and is fastened and fixed.

  A cylinder chamber is horizontally formed near the inner upper part of the rectangular parallelepiped casing 28a of the release actuator 28, a piston is slidably inserted into the cylinder chamber, and the tip of the piston rod 28c connected to the piston is shown in FIG. As shown in FIG. 6, the casing protrudes from the right side surface of the casing 28a. The tip of the piston rod 28c is located above the key-shaped opening 2a of the case body 2, and the tip 7a of the tip protrusion 7b of the coil spring 7 protruding upward from the key-shaped opening 2a of the case body 2 is The release actuator 28 is engaged with the tip of the piston rod 28c. In this way, by directly fixing the release actuator 28 to the upper surface of the case body 2, the mounting plate 9 is not necessary, and the number of parts can be reduced.

  When releasing the lock, the piston rod 28c is pushed out by applying fluid pressure to the release actuator 28 as described above. At this time, the piston rod 28c of the release actuator 28 causes the tip 7a of the coil spring 7 to open the coil, that is, in the winding direction of the coil spring from the front to the back in the front view of the coil spring 7 in FIG. Yes, the distal end portion 7a is pushed in the anti-twist direction (rightward and clockwise in FIG. 15) of the distal end portion 7a of the coil spring 7. As a result, the clamping force of the coil spring 7 on the sleeve 14 of the rotary shaft 11 disappears, the lock of the rotary shaft 11 is released, and the fluid pressure rotary actuator becomes rotatable.

  On the other hand, when returning to the locked state, similarly to the above, when the piston rod 28c of the release actuator 28 is pulled back, the front end portion 7a of the coil spring 7 returns to the coil spring tightening direction on the left side, and the coil spring 7 The sleeve 14 of the rotating shaft 11 is tightened by force to return to the locked state.

  16 and 17 show still another embodiment using the locking device 1 described above. In this example, as shown in FIG. 16, the sleeve 24 having a length approximately twice as long as the above is fitted to the protruding portion of the rotary shaft 41 of the fluid pressure rotary actuator 10. Then, in order to generate a strong braking force against the rotational force that rotates the rotating shaft 41 of the fluid pressure rotary actuator 10 in both directions, two locking devices 1 and 1 are used as the locking device unit. The pressure rotary actuator 10 is attached in series to the front surface.

  That is, as shown in FIGS. 16 and 17, the two locking devices 1 and 1 are connected to the fluid pressure rotary actuator 10 on the cover plate 3 side as in the case of one locking device 1 shown in FIGS. The mounting surface is attached to the front surface of the casing of the fluid pressure rotary actuator 10 with the mounting surface being the mounting surface, and another locking device 1 is mounted first in the reverse direction, as in FIGS. The surface on the side opposite to the cover plate 3 is attached to the front surface of the case body 2 of the locking device 1 as an attachment surface. That is, as shown in FIG. 17, the mounting surface of another locking device 1 in the reverse direction is applied to the front surface of the locking device 1 that has been mounted first, and four screws having a length twice that of the mounting screw 21 are applied. Is inserted into the mounting hole 2b of the case body 2 and the tip thereof is screwed into the mounting screw hole of the casing 15 of the actuator, so that the two locking devices 1 and 1 are directed in series in opposite directions. It is fixed to the front surface of the casing 15 in a state.

  Thereby, the fluid pressure rotary actuator 10 has a coil spring 7 wound in opposite directions by the two locking devices 1 and 1 when the rotating shaft 41 is not energized (when no fluid pressure is applied). 7 acts on the sleeve 24 at the end of the rotating shaft 41, and the rotation of the rotating shaft 41 in both directions is strongly locked.

  When releasing the lock, the piston rods 8c and 8c are pushed out by applying fluid pressure to the release actuators 8 and 8 of the lock devices 1 and 1 as described above. At this time, the piston rods 8c and 8c of the release actuators 8 and 8 have the tip portions 7a and 7a of the coil springs 7 and 7 in the direction of opening the coils (anti-twist direction), respectively. Push. As a result, the tightening force of the coil springs 7 and 7 on the sleeve 24 of the rotary shaft 41 disappears, the lock of the rotary shaft 41 is released, and the fluid pressure rotary actuator 10 can rotate.

  On the other hand, when the rotary shaft 41 of the fluid pressure rotary actuator 10 is locked, when the piston rods 8c and 8c of the release actuators 8 and 8 are pulled back in both the locking devices 1 and 1, as described above, 7 end portions 7a and 7a are restored, and the coil springs 7 and 7 tighten the sleeve 24 of the rotating shaft 41 by the spring force to return to the locked state.

  In this way, two locking devices 1 and 1 having the same structure as a unit can be attached in series to lock both rotation directions of the rotary shaft 41 of the fluid pressure rotary actuator 10 to be attached. Compared to the case of manufacturing the lock device having the structure, it can be manufactured at a low cost.

  In the above embodiment, a fluid pressure cylinder is used as the release actuator, but an electromagnetic solenoid or an electric linear actuator can also be used. Although the plunger driving force of the electromagnetic solenoid is generally relatively small, as described above, the length of the tip protrusion 7b of the coil spring 7 can be lengthened to reduce the moment force acting in the direction of opening the coil spring 7. Therefore, it is possible to use a small electromagnetic solenoid as a release actuator.

Further, in the above embodiment, the mounting surface of the locking device 1 is applied to the front surface (mounting surface) of the fluid pressure rotary actuator 10 and directly mounted and fixed. However, the mounting surface of the locking device 1 is fluid pressure rotary actuator via a joint plate. It can also be fixed to the front (mounting surface). In this case, the joint plate is provided with a mounting hole that matches the mounting hole 2b drilled in the case body 2 of the locking device 1, and a mounting hole that matches the mounting hole of the fluid pressure rotary actuator to be mounted. If this is the case, the lock device can be easily mounted and used for fluid pressure rotary actuators of various sizes and types.

Claims (9)

A locking device attached to a casing of the rotary actuator to lock the rotary shaft of the rotary actuator having a rotary shaft,
A sleeve fitted to the end of the rotating shaft;
A case body fixed to the casing of the rotary actuator so as to surround the sleeve and having a key-shaped opening;
The key-shaped opening is disposed in the center of the key-shaped opening, is fitted onto the sleeve so as to tighten the outer periphery of the sleeve, the end is fixed to the case body, and the tip is free. A coil spring arranged to protrude outward from
The coil spring is attached to the outside of the case body, and the tip of the coil spring is pushed or pulled in the circumferential direction to open the coil spring, thereby releasing the tightening force of the coil spring against the sleeve and releasing the lock. A release actuator;
The coil spring is inserted into a central portion of the key-shaped opening in the case body, and the end portion of the coil spring is fixed by fitting and fixing the cover plate to the back surface of the case body. And the case body is fixed by being clamped to the front surface of the rotary actuator by a mounting screw, and the winding direction viewed from the tip side of the coil spring is A locking device, characterized in that the locking device is set in a direction opposite to the rotational direction that requires locking of the rotary shaft.   The locking device according to claim 1, wherein the release actuator is attached to the outside of the case body via a mounting plate.   The locking device according to claim 1, wherein the release actuator is directly attached to an outer surface of the case body.   The end portion of the coil spring is inserted into a spring end fitting hole provided in a part of the case body, and a cover plate is fitted into the back surface of the case body to fix the cover plate so that the end portion of the coil spring is 2. The locking device according to claim 1, wherein the locking device is fixed by being sandwiched between the cover plate and the case main body.   2. A plurality of types of coil springs having the same winding inner diameter and different wire rod outer diameters are prepared as the coil springs, and the braking force is changed by replacing the plurality of types of coil springs. Locking device.   2. The locking device according to claim 1, wherein a plurality of types of coil springs having slightly different winding inner diameters are prepared as the coil springs, and the braking force is changed by replacing the plurality of types of coil springs. .   The release actuator is configured to be able to push out a piston rod, and the tip of the piston rod engages with the tip of the coil spring protruding from the key-shaped opening of the case body, and the tip of the coil spring 2. The locking device according to claim 1, wherein the tightening force is released by urging the portion in an opening direction.   The cover plate is fitted and fixed in a recess formed on the back surface of the case body, and the mounting surface of the case body with respect to the rotary actuator is set on both the cover plate side and the anti-cover plate side. Is attached to the casing of the rotary actuator by changing the mounting surface on the cover plate side or the anti-cover plate side, thereby changing the winding direction of the coil spring with respect to the rotation axis of the rotary actuator, The locking device according to claim 1, wherein a rotation lock direction of the actuator is set.   Two locking device units including the case main body, the cover plate, the coil spring, the mounting plate, and the release actuator are disposed on the cover plate side or the anti-cover plate side with respect to the casing of the rotary actuator. Sleeves that are mounted in series with different mounting surfaces, and in which the coil springs of the two locking device units having different winding directions are arranged in series, and are externally fitted to the tip of the rotary shaft of the rotary actuator 9. The lock device according to claim 8, wherein the rotation lock direction of the rotary shaft of the rotary actuator is set to both directions.

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