JPH08193605A - Cylinder with end lock - Google Patents

Abstract

PURPOSE: To provide a cylinder with an end lock, in which engagement/ disengagement of a piston rod to a lock piston can be conducted smoothly and can be controlled simply. CONSTITUTION: In a cylinder with an end lock, in which a piston rod 23 inserted into a cylinder 20 is engaged with a lock piston 36 so as to prevent the piston rod 23 from moving in the axial direction, a head 28 is connected to an end in the axial direction of the piston rod 23, while an axial hole 29 is made in the head 28 so as to form an annular projected part in the inner peripheral surface of the hole 29. A cylinder 32, which has at its one end an axial projected part 31 to be fitted with the axial hole 29, is connected to a cylinder 27 connected to the cylinder 20. The lock piston 36 is inserted into the cylinder 27 in a movable manner in the axial direction, being energized by a compression spring 40. Moreover, an axial hole 33 and a lateral hole 34 are made in the axial projected part 31. A rod 37 is inserted into the axial hole 33 so that the rod 37 is connected to the lock piston 36, while a ball 35, which moves in the radial direction when the rod 37 moves in the axial direction, is fitted into the lateral hole 34.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cylinder with an end lock, and more particularly to a cylinder used in a chuck device for grasping and releasing an object to be conveyed in a fluid pressure conveying device.

[0002]

2. Description of the Related Art A cylinder with an end lock is a device for connecting a working portion to an outer end portion of a piston rod inserted in a cylinder capable of supplying and discharging a pressure fluid to perform a required operation. Is used for.

Conventionally, this cylinder with an end lock is
For example, as shown in FIG. 4, a piston rod 2 is inserted into a cylinder 1, a lock portion 3 having a reduced diameter is formed at an inner end portion of the piston rod 2, and a lock piston 4 that engages and disengages with the lock portion 3 is formed. The inserted sleeve 5 is orthogonally connected to the cylinder 1, and the lock piston 4 is always urged by the spring 6 against the piston rod 2.

Therefore, when fluid can be supplied into and discharged from the cylinder 1 and the piston rod 2 is moved in the axial direction, if the seat pressure fluid is supplied to the lock piston 4 side in the state of FIG. Comes out of the lock part 3 against the force of the spring 6, so that the piston rod 2
Project from the cylinder 1. And the lock piston 4
When the pressure fluid in the side cylinder 1 is discharged and the piston rod 2 is drawn into the cylinder 1, the lock piston 4 pushed out by the force of the spring 6 engages with the lock portion 3 and the piston rod 2 comes off. It is stopped and the lock is completed.

In this cylinder with an end lock, for example, a magnet piston is movably inserted into a tubular body forming a conveying path between two points, and the magnet piston is pushed forward by a pressure fluid to be magnetically coupled thereto. A transfer body (shuttle) mounted outside the tubular body is used as a chuck device of a fluid pressure transfer device for transferring a transfer object.

That is, as shown in FIG. 5, a conveying path 9 formed by connecting a tube body 7 with a support body 8 connects two points, and a magnet piston 10 is inserted into the tube body 7. A chuck device 12 is fixedly provided substantially perpendicular to a carrier (shuttle) 11 mounted on the carrier path 9 by being magnetically coupled to the carrier. The chuck device 12 is formed by arranging a pair of cylinders having substantially the same structure as the cylinder with the end lock in the vertical direction so as to form a drive portion, and at least one of the pair of piston rods 2 and 2 is slidable in the left-right direction. A pair of chucks 13 is provided.

Since the chuck device 12 grips the transported object and moves on the transportation path 7, the transported object must not fall during the movement. Therefore, the lock piston 4 is actuated to move the piston rod 2. Lock with the specified stroke. The purpose of using the pair of cylinders 1 and the piston rods 2 is to stop the rotation of the conveyed object during chucking.

[0008]

However, according to the conventional cylinder with an end lock, the lock piston 4
Locks by advancing and retracting toward the lock portion 3 of the piston rod 2 in an orthogonal state. Therefore, when a load such as a conveyed object is loaded on the piston rod 2, the lock piston 2 is tried to be removed from the lock portion 3. However, it may cause twisting, which may prevent smooth removal. Therefore, when the lock of the piston rod 2 is released, it is necessary to temporarily push the piston rod 2 slightly upward (rightward in FIG. 4) to shift the positions of the lock piston 4 and the lock portion 3. .

Therefore, the operation for releasing the lock becomes complicated, which complicates the control, and it takes time to release the lock, which hinders the rapid conveyance.

Therefore, the present invention provides a cylinder with an end lock in which engagement and disengagement of the piston rod and the lock piston are smooth and control is simple.

[0011]

In a cylinder with an end lock according to the present invention, a piston rod axially movable in the cylinder engages with a lock piston to prevent axial movement of the piston rod. In the cylinder with an end lock described above, a head is connected to the axial end of the piston rod, an axial center hole is formed in the head, and an annular protrusion is formed on the inner peripheral surface of the head. A cylinder having a matching axial center projection at one end is connected to the cylinder, and a lock piston is urged toward the piston rod side so as to be movable in the axial direction, and a shaft is attached to the axial center projection. A core hole and a lateral hole orthogonal to this are bored, a rod is inserted into the axial center hole to connect the rod to the lock piston, and the rod is axially moved in the lateral hole by a radial direction. Fitted moving ball, characterized by comprising.

[0012]

[Operation] When the piston rod contracts in the cylinder, the lock piston moves in the axial direction to release the pushing of the ball in the axial center hole to the outer peripheral direction, and the head fits into the axial center projection to allow the ball to cross the hole. It is pushed in and the annular projection gets over the ball. Then, when the pressure fluid in the cylinder is released to the atmosphere, the lock piston moves in the direction opposite to the above by the urging force thereof to come into contact with the ball and pushes the ball in the outer peripheral direction.

Therefore, the head of the piston rod and the axial projection of the cylinder are connected and locked by the ball and the annular projection. To release this lock, move the lock piston against the urging force to release the contact between the rod and the ball, and the ball is ready to roll in the lateral hole. Just move it.

[0014]

Embodiments of the present invention will be described below with reference to the accompanying drawings. As shown in FIG.
1 and a rod 22 are inserted in the piston rod 23 so as to be movable in the axial direction, and the lower end of the cylinder 20 is connected to the rod 2
2 loosely fits and is closed by a lid 26 having a shaft hole 25 in which a seal 24 that slides in a liquid-tight manner is mounted, and
A cylinder 27 having an inner diameter smaller than that of the cylinder 20 is connected to the upper end portion, and a head 28 is inserted into the cylinder 27 so as to be movable in the axial direction. The head 28 is connected to the upper end portion of the rod 22 or It is integrally formed. Although the cylinders 20 and 27 are divided into two for convenience, they may be integrated.

The head 28 is provided with an axial center hole 29 at the upper end thereof, and an annular projection 30 is formed on the inner peripheral edge of the axial center hole 29. An axial projection 31 is slidably contactable with the annular projection 30. The axial center projection 31 that is inserted is projected from the lower end of a cylinder 32 connected to the upper portion of the cylinder 27 (see FIG. 2). The axial protrusion portion 31 has an axial hole 33, and a plurality of lateral holes 34 in a direction orthogonal to the axial hole 33 are bored in the circumferential direction, and balls 35 can roll in these lateral holes 34, respectively. When the ball 35 moves in the outer peripheral direction from the lateral hole 34, the ball 35 comes into contact with the annular protrusion 30 to prevent the head 28 from coming off.

A rod 37 of a lock piston 36 is tightly fitted in the shaft hole 33, and this rod 37 moves in the axial direction to allow the ball 35 to move in the radial direction and is connected to the upper end of the rod 37. The piston 38 is fitted in the cylinder 32. The upper end of the cylinder 32 is opened, and a spring seat 39 is inserted through the inner fitting ring so that the compression seat 40 has one end abutted against the spring seat 39. Is in contact with the upper end of the lock piston 36. Therefore, the lock piston 36 is always biased downward, and the rod 37 pushes the ball 35 toward the outer peripheral direction of the axial center projection 31 to move it.

A port 41 is formed in the cylinder 27 by increasing the diameter of the upper end of the shaft center hole 33, and a pipe line 42 opening to the port 41 is cut. The pipe line 42 is formed on the outer peripheral surface of the cylinder 27. To communicate with the port 43 formed in the above. Further, the cylinder 27 is provided with a pipe line and a port 44 that open near the head 28. Further, a pipe line 45 that opens into the shaft hole 25 in which the rod 22 of the piston rod 23 is loosely fitted is provided in the lid body 26 together with the port 46. Port 4
Fluid pressure pipes such as pneumatic pressure or hydraulic pressure are connected to 3, 44 and 46, respectively.

That is, as shown in FIG.
Is introduced with a fluid that pushes up the piston rod 23,
Alternatively, the pipe 4 can be used to release the fluid in the cylinder 20 to the atmosphere.
7 is connected, a fluid that pushes down the piston rod 23 is introduced into the port 44, or a pipe 48 is connected so that the fluid in the cylinder 27 can be released to the atmosphere.
A fluid for pushing up the lock piston 36 is introduced into the valve 3, or a pipe 49 is connected to the fluid in the cylinder 32 so that the fluid can be released to the atmosphere.

The pipe 49 is connected to the pipe 48 via a shuttle valve 50 which is a kind of check valve, the pipe 48 is connected to the pipe 47, and the pipe 48 is connected to the pipe 51. The switching valve 52 is connected to the pipe 47. A fluid pressure supply source 53 is connected to the switching valve 52. The switching valve 52 is driven by a controller (not shown) by an electric signal.

Next, the operation of the above embodiment will be described with reference to FIG.
As shown in (A), when the piston rod 23 is lowered, when the switching valve 52 is moved forward to supply the fluid pressure to the pipe 51, the pressure fluid is press-fitted into the cylinder 20 and is also passed through the pipe 49. Since the pressure fluid is pressed into the cylinder 32 and pushes up the lock piston 36, the ball 35 is allowed to roll in the lateral hole 34, so that the annular protrusion 30 slides down the axial center protrusion 31. The piston rod 23 is pushed down, and the rod 22 projects from the lid body 26 with a predetermined stroke.

Further, as shown in FIG. 3 (B), the switching valve 5
When 2 is moved back and fluid pressure is supplied to the pipe 47, the piston rod 23 is pushed up and the pipes 47, 4
Fluid pressure is supplied into the cylinder 32 via 9 and the lock piston 36 rises and the head 28 is fitted into the shaft center projection 31.

Therefore, at the stage when the piston rod 23 is raised, as shown in FIG.
When 4, 46 are released to the atmosphere, the lock piston 23 is lowered by the force of the compression spring 40, and the rod 37 pushes the ball 35 of the lateral hole 34 toward the outer peripheral direction of the axial center projection 31 to position it below the annular projection 30. As a result, the head 28 is connected to the shaft center projection 31 without coming off and the locking is completed.

Thus, the ball 35 and the annular projection 3 are locked without the lock piston moving forward and backward from the direction orthogonal to the piston rod to lock the piston rod as in the conventional case.
Since the piston rod 23 and the lock piston 36 are connected and locked in the axial direction of the piston rod 23 via 0, the unlocking operation can be smoothly performed even when the load W is applied to the piston rod 23.

[0024]

According to the present invention described above, since the piston rod and the lock piston are locked in the axial direction of the piston rod through the ball and the annular projection, the load is applied to the piston rod. Also, the unlocking operation can be performed smoothly, the time required for unlocking can be shortened, and the transport efficiency can be improved.

[Brief description of drawings]

FIG. 1 is a sectional front view showing an embodiment of the present invention.

FIG. 2 is an enlarged view of a main part of FIG.

[FIG. 3] (A), (B), (C) are pressure piping system diagrams, respectively.

FIG. 4 is a cross-sectional front view of a conventional example.

FIG. 5 is a perspective view of a main part of a fluid pressure transfer device.

[Explanation of symbols]

 20, 27, 32 ... Cylinder 23 ... Piston rod 28 ... Head 29 ... Shaft center hole 30 ... Annular projection 31 ... Shaft center projection 33 ... Shaft center hole 34 ... Side hole 35 ... Ball 36 ... Lock piston 37 ... Rod 39 ... Spring seat 40 ... Compression spring 43, 44, 46 ... Port 42, 45 ... Pipe line

Claims (1)

[Claims] 1. A cylinder with an end lock in which a piston rod axially movable in a cylinder engages with a lock piston to prevent axial movement of the piston rod. A cylinder having an end connected to a head, an axial center hole formed in the head, an annular projection formed on an inner peripheral surface thereof, and an axial projection protruding at one end fitted into the axial center is formed. A lock piston is inserted into the cylinder so as to be axially movably urged toward the piston rod side, and a shaft hole and a lateral hole orthogonal to the shaft hole are formed in the shaft protruding portion. A rod is inserted into the shaft hole to connect the rod with the lock piston, and a ball that moves in the radial direction by the axial movement of the rod is fitted in the lateral hole. Cylinder.