JP3894154B2 - Locking device for fluid pressure cylinder - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a locking device capable of locking sliding of a piston rod of a fluid pressure cylinder such as a pneumatic cylinder with respect to sliding in both directions by a pair of locking members.
[0002]
[Prior art]
As such a locking device, a device described in Patent Document 1 (Japanese Patent Laid-Open No. 8-219116) (hereinafter referred to as “conventional example 1”) or a device described in Patent Document 2 (Japanese Patent Publication No. 2002-502014). (Hereinafter referred to as “conventional example 2”).
[0003]
In Conventional Example 1, a spring is interposed between a pair of brake members that allow the piston rod of the air cylinder to pass through the notch, and the pair of brake members are inclined to the opposite sides with respect to the piston rod by the reaction force of the spring. As a result, the notches of the notches of these brake members are brought into pressure contact with the piston rod and can be locked. On the other hand, the electromagnetic solenoid interposed between the pair of brake members can be unlocked by pulling the pair of brake members against the spring.
[0004]
In Conventional Example 2, a pair of tightening jaws that allow the piston rod to pass through the through-holes are supported in a tiltable manner by tilting bearings that are spherical bodies interposed between their base end portions (lower end portions). By tightening (pulling) the tip (upper end) of the clamping jaws with a spring that is an O-ring, the lip of the through-holes of these clamping jaws comes into pressure contact with the piston rod, and the lock Can be done. On the other hand, an actuating piston that is slidably fitted in the sleeve is pushed by air pressure from the outside of the sleeve, and a hemispherical actuating nose at its tip is placed between the tip of the pair of clamping jaws. The lock can be released by interposing and separating the pair of tightening jaws against a spring which is an O-ring.
[0005]
[Patent Document 1]
JP-A-8-219116 (second page, FIG. 1)
[Patent Document 2]
Japanese translation of PCT publication No. 2002-502014 (9th page, 10th page, FIG. 1)
[0006]
[Problems to be solved by the invention]
However, according to the conventional example 1, since the unlocking (unlocking) is performed by the electromagnetic solenoid, an electrical control system that is completely different from the pneumatic system for the air cylinder is required, and is linked with the operation of the piston rod of the air cylinder. The control system for this is complicated.
[0007]
In addition, according to the conventional example 2, although the unlocking is performed by air pressure, the air pressure is supplied and discharged from a dedicated port different from the air cylinder which is the main body. It is a single movement that has nothing to do with the movement of the rod. Therefore, air pressure control different from the operation of the piston rod of the air cylinder is required, and when the air cylinder side air pressure is released in an attempt to synchronize the lock mechanism with the air cylinder side operation, the lock mechanism operates in the locking direction. Since the piston rod remains locked, it is difficult to perform intermediate locking at any position in conjunction with the movement of the piston rod of the air cylinder, and it is limited to locking at the stroke end. Furthermore, when the piston rod is locked, the tip end portions (upper end portions) of the pair of tightening jaws are pulled by a spring that is an O-ring while pushing up the hemispherical actuating nose, and the piston rod is tilted. Therefore, sufficient locking force cannot be obtained, and there is a possibility that rattling may occur due to the acting nose interposed between the tip portions of the pair of clamping jaws. On the other hand, when unlocking, a hemispherical moving nose is inserted between the distal ends of a pair of clamping jaws, and the pair of clamping jaws are separated from each other against a spring that is an O-ring. Since it is a mechanism, pneumatic-mechanical force conversion cannot be performed smoothly.
[0008]
Accordingly, an object of the present invention is to provide an intermediate lock at any position interlocked with the piston rod, and the control thereof is easy, and the fluid can be securely locked in both directions with sufficient locking force without rattling. To provide a locking device for a pressure cylinder.
[0009]
[Means for Solving the Problems]
The present invention is a locking device that locks sliding of a piston rod 6 of a fluid pressure cylinder with a pair of tiltable ring-shaped lock members 12 and 13 that pass through the piston rod 6, and projects through the piston rod 6 The lock cylinder 10 that is supplied and discharged with fluid pressure from the rod side port 8 provided in the rod side cover 4 through the inside of the rod side cover 4 is orthogonal to the axis of the piston rod 6. The pair of lock members 12 and 13 are tilted in opposite directions by sliding of the lock piston 19 that slides in a direction orthogonal to the piston rod 6 in the lock cylinder 10. A pair of link levers 28 and 29, which are pin-coupled to the pair of lock members 12 and 13, respectively, are opposed to each other so that the lock piston 19 and a lock spring 20 for urging the lock piston 19 in the lock cylinder 10 is provided, and the lock piston 19 is propelled by the lock spring 20 so that the pair of lock members 12 and 13 are opposed to each other. When tilted, the pair of lock members 12 and 13 are pressed against the outer periphery of the piston rod 6 to lock the piston rod 6, and fluid pressure is supplied from the rod side port 8 into the lock cylinder 10 to lock the piston. When 19 is slid against the lock spring 20, the pair of lock members 12, 13 are in a side-by-side posture orthogonal to the piston rod 6 and pass through the piston rod 6 as it is. It is characterized in that sliding is allowed.
[0010]
A preferred embodiment of the present invention based on such a structure is as follows.
A lock chamber for communicating the rod side port and the lock cylinder is provided inside the rod side cover, and the pair of lock members are supported in a tiltable manner in the lock chamber.
[0011]
The spherical bearing projections are integrally projected on the pair of lock members, and the spherical bearing projections are fitted into the spherical bearing recesses on the inner surface of the lock chamber, so that the pair of lock members are supported in a tiltable manner.
[0012]
Manual unlocking means for manually moving the lock piston from the outside of the lock cylinder is provided. As the manual unlocking means, a lock releasing rod that protrudes from the lock piston and protrudes outward from the opening of the lock cylinder is preferable.
[0013]
DETAILED DESCRIPTION OF THE INVENTION
Next, embodiments of the present invention will be described in detail with reference to the drawings.
[0014]
In FIG. 1, a main body 1 of an air cylinder A is composed of a cylinder tube 2, a head side cover 3 and a rod side cover 4 at both ends thereof, and pistons 5 having cushion protrusions 5a on both sides are formed in the left and right sides. The piston rod 6 is slidably fitted and penetrates the rod side cover 4 slidably. At that time, the piston rod 6 is guided to the guide sleeve 4 a in the rod side cover 4. The head-side cover 3 and the rod-side cover 4 are provided with a head-side port 7 and a rod-side port 8, respectively. By supplying and discharging air pressure through these ports 7 and 8, the piston 5 is slid back and forth.
[0015]
Such a structure is the same as that of a conventional ordinary cushioned air cylinder, but in this air cylinder A, a lock device B according to the present invention is incorporated in the rod side cover 4.
[0016]
The lock device B forms a lock chamber 9 having a cross-sectional shape (upper rectangular shape and lower circular shape) as shown in FIG. 2 inside the rod side cover 4, and a part of the lock device B faces the lock chamber 9. A short lock cylinder 10 entering the rod side cover 4 is attached to the rod side cover 4 in a direction perpendicular to the axis of the piston rod 6. The lock chamber 9 communicates with the rod-side pneumatic chamber 1a in the air cylinder body 1 through a rod through-hole 11 through which the piston rod 6 penetrates with a gap. Is discharged. As shown in the exploded view of FIG. 4, the lower end of the lock cylinder 10 is opened so as to open into the lock chamber 9.
[0017]
In the lock chamber 9, a pair of lock members 12 and 13 that allow the piston rod 6 to pass therethrough are supported so as to be separated from each other in the axial direction of the piston rod 6. That is, as shown in FIG. 5, each of the lock members 12 and 13 has a spherical bearing projection 15 integrally projecting from the lower portion of the ring portion 14 through which the piston rod 6 passes, and this spherical bearing projection 15 is shown in FIG. As shown in FIG. 1, by being fitted to a spherical bearing recess 16 formed on the bottom surface of the lock chamber 9, the lock chamber 9 is supported so as to be tiltable. Each of the lock members 12 and 13 is integrally provided with a connecting projection 17 at the top thereof. The connecting projection 17 is provided with a pin hole 18 as shown in the exploded view of FIG. 4 and FIG.
[0018]
A lock piston 19 is fitted in the lock cylinder 10 opened to the lock chamber 9 so as to be slidable up and down, and a lock spring for urging the lock piston 19 toward the lock chamber 9 (downward). 20 is arranged. The lock piston 19 has flanges 21 on both sides, and a packing 22 is held between the flanges 21. Further, the lock piston 19 has a lock release rod 23 protruding from the center of the upper surface and a connecting rod 24 protruding from the center of the lower surface. The connecting rod 24 is provided with a pin hole 25 as shown in the exploded view of FIG. The connecting rod 24 and the connecting protrusions 17 of the pair of lock members 12 and 13 are connected using pins 30, 31 and 32 by a pair of link levers 28 and 29 having pin holes 26 and 27, respectively. The sliding movement of the lock piston 19 is transmitted to the pair of lock members 12 and 13 as tilts in opposite directions.
[0019]
As shown in FIGS. 1 to 3, the lock release rod 23 of the lock piston 19 has a thin upper end 23 a through a hole 33 provided in the center of the ceiling of the lock cylinder 10 so that it can be operated from the outside of the lock cylinder 10. It is designed to protrude.
[0020]
When the air cylinder A supplies air pressure from the rod-side port 8 as shown in FIG. 6, the lock device B configured in this way enters the rod-side air pressure chamber 1 a through the rod through-hole 11 and locks at the same time. It enters the chamber 9 and also enters the lock cylinder 10 opened to the lock chamber 9. As a result, the lock piston 19 is slid upward against the spring 20, so that the upper portions of the pair of lock members 12 and 13 are attracted to each other, and the lock members 12 and 13 are connected to the axis of the piston rod 6. The piston rod 6 is passed through as it is in an orthogonal posture. That is, the lock device B is unlocked (unlocked), and the piston rod 6 is immediately allowed to slide, and the piston 5 slides to the right.
[0021]
On the other hand, when the air pressure is released from the rod side port 8, the air pressure in the lock cylinder 10 is released from the rod side port 8. Therefore, as shown in FIG. 7 and FIG. The spring 20 is urged downward by the urging of the spring 20, and the upper portions of the pair of lock members 12 and 13 are separated from each other so that the lock members 12 and 13 tilt in opposite directions. The inner periphery of the portion 14 is in pressure contact with the outer periphery of the piston rod 6, and the piston rod 6 is locked. Since the locking is performed simultaneously with the release of air pressure from the rod side port 8, it is possible to easily lock the piston rod 6 at any intermediate position.
[0022]
In order to unlock, it is only necessary to supply air pressure again from the rod side port 8, but if the lock piston 19 is manually lifted from the outside of the lock cylinder 10 using the unlock rod 23, it is manually unlocked as needed. You can also At this time, a screw hole 23b may be provided at the upper end of the lock release rod 23 as shown in FIG. 8 so that the lock release rod 23 can be easily lifted with a required screwed tool.
[0023]
In the above embodiment, the locking device B of the present invention is applied to the air cylinder A, but it can also be applied to a fluid pressure cylinder other than the air cylinder.
[0024]
【The invention's effect】
As described above, according to the locking device of the present invention, the piston rod is unlocked by the pair of locking members by the fluid pressure from the rod-side port of the fluid pressure cylinder itself, so that the arbitrary one in conjunction with the piston rod is used. An intermediate lock in position is possible and the control is easy. In addition, when the pair of locking members are tilted by sliding the locking piston, the locking piston and the pair of locking members are connected by a pair of link levers, so that the locking in both directions can be reliably performed with sufficient locking force without rattling. .
[0025]
If the lock chamber for communicating the rod side port and the lock cylinder is provided inside the rod side cover and the pair of lock members are supported to be tiltable in the lock chamber, the size of the lock device can be reduced. I can plan.
[0026]
If the spherical bearing protrusions are integrally provided on the pair of lock members and the spherical bearing protrusions are fitted into the spherical bearing recesses on the inner surface of the lock chamber, the support of the pair of lock members is supported. The structure can be simplified.
[0027]
As described in claims 4 and 5, if a manual unlocking means capable of manually moving the lock piston from the outside of the lock cylinder is provided, unlocking can be manually performed at any time.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view of an entire air cylinder incorporating a locking device according to the present invention.
FIG. 2 is a sectional view of the locking device (a section in a direction perpendicular to the axis of the piston rod).
FIG. 3 is a plan view of the locking device.
FIG. 4 is an exploded view of the locking device.
FIG. 5 is a front view of a lock member.
FIG. 6 is a sectional view of the entire air cylinder in an unlocked state.
FIG. 7 is a cross-sectional view in the same locked state.
FIG. 8 is a partially enlarged view of the above.
[Explanation of symbols]
A Air cylinder B Lock device 1 Air cylinder body 1a Rod side pneumatic chamber 2 Cylinder tube 3 Head side cover 4 Rod side cover 4a Guide sleeve 5 Piston 5a Cushion projection 6 Piston rod 7 Head side port 8 Rod side port 9 Lock chamber 10 Lock cylinder 11 Rod through hole 12/13 Lock member 14 Ring portion 15 Spherical bearing projection 16 Spherical bearing recess 17 Connection projection 18 Pin hole 19 Lock piston 20 Lock spring 21 鍔 22 Packing 23 Lock release rod 23a Upper end 23b Screw hole 24 Connecting rod 25/26/27 Pin hole 28/29 Link lever 30/31/32 Pin 33 Hole

Claims (5)

A locking device that locks sliding of a piston rod of a fluid pressure cylinder with a pair of tiltable ring-shaped locking members that allow the piston rod to pass through the rod side cover through which the piston rod protrudes, A lock cylinder that supplies and discharges fluid pressure from the rod side port provided in the rod side cover through the inside of the rod side cover is provided in a direction orthogonal to the axis of the piston rod, and the inside of the lock cylinder is disposed in the piston rod The pair of link levers respectively pin-coupled to the pair of lock members are opposite to each other so that the pair of lock members are tilted in opposite directions by sliding of the lock piston sliding in a direction orthogonal to pins connected to the lock piston in the direction, also urging the locking piston in the lock cylinder That the locking spring is provided, when the pair of lock members by promoting the lock piston by the lock spring is inclined in opposite directions to each other, said piston rod pressed against the outer periphery of the pair of locking members the piston rod is locked, Also, when fluid pressure is supplied from the rod side port into the lock cylinder and the lock piston is slid against the lock spring, the pair of lock members are in a side- by- side posture orthogonal to the piston rod and the piston rod remains A fluid pressure cylinder locking device characterized in that the piston rod is allowed to slide by being penetrated.   2. The fluid pressure cylinder according to claim 1, wherein a lock chamber for communicating the rod side port and the inside of the lock cylinder is provided inside the rod side cover, and the pair of lock members are supported to be tiltable in the lock chamber. Locking device.   A pair of lock members are supported so as to be tiltable by integrally projecting spherical bearing protrusions on a pair of lock members and fitting the spherical bearing protrusions into spherical bearing recesses on the inner surface of the lock chamber. The fluid pressure cylinder locking device according to claim 2.   4. The locking device for a hydraulic cylinder according to claim 1, further comprising manual unlocking means capable of manually moving the lock piston from the outside of the lock cylinder.   5. The fluid pressure cylinder locking device according to claim 4, wherein the manual unlocking means is a lock releasing rod projecting from the lock piston and partially protruding outward from the opening of the lock cylinder.

Images