JPH0428924B2 - - Google Patents

Description

[Detailed Description of the Invention] <Industrial Application Field> The present invention relates to a cylinder stop device that locks and stops the piston rod of a fluid cylinder at an arbitrary position by using a brake, and in particular, the present invention relates to a cylinder stop device that locks and stops the piston rod of a fluid cylinder at an arbitrary position. This invention relates to a cylinder stop device that can automatically and reliably lock a piston rod.

<Prior art> Regarding this type of cylinder stop device, the present inventor has already proposed a mechanical cylinder stop device that reliably locks the piston rod of a fluid cylinder at an arbitrary position in Japanese Patent Application No. 74674/1982. .

As shown in FIGS. 6 and 7, this cylinder stop device is attached to surround the outer periphery of the piston rod 5, which is fixed to a piston (not shown) in the cylinder tube 1, on the side that protrudes from the cylinder cover 3. That is, approximately semi-cylindrical brake members 6 and 7 are disposed on the outer periphery of the piston rod 5, and these are thick-walled cylinders whose outer and inner peripheries are eccentric, with a maximum wall thickness and a minimum wall thickness. It is formed by being divided into two parts in the axial direction, and the outer periphery of each end is rotatably supported by support members 8 and 9.

The support member 8 is formed to also serve as a housing part on the side of the cylinder cover 3, and the piston rod 5 passes through the center thereof.The support member 9 on the tip side is made of a bearing metal fitted inside the housing 10. supports the piston rod 5 in a slidable manner. And the brake members 6 and 7 are the seventh
As shown in the figure, a space is formed at the mating part so that both can rotate relative to each other to some extent, and the center of the circle that includes the outer periphery of the brake members 6 and 7 is closer to the inner periphery, that is, the center of the piston rod 5. It is offset slightly downward.

Furthermore, brackets 12 and 13 having an L-shaped cross section are fixed to the lower portions of the brake members 6 and 7, and a coil spring 14 that biases them in the direction of opening is hooked between them. It rotates along the supporting members 8 and 9 on its outer periphery, and tightens the inner piston rod 5 from both sides to lock it, that is, apply a brake.

On the other hand, L-shaped arms 15 and 16 are fixed to the upper parts of the brake members 6 and 7 so as to face each other, and between the two arms 15 and 16, a hydraulic actuator 2 is mounted.
0 is fixed to a mounting plate 17 attached to the upper part of the housing 10.

This fluid pressure actuator 20 has a cylinder 2
Two pistons 22 and 23 are fitted into the interior of the piston 1 with a space between them, and pressing protrusions 24 and 25 are provided on the outside of the pistons 22 and 23 to push the arms 15 and 16, respectively, so that fluid is generated between the pistons 22 and 23. The pistons 22 and 23 are moved outward relative to each other by applying pressure, and the upper portions of the arms 15 and 16, that is, the upper portions of the brake members 6 and 7 are opened to release the brake.

<Problems to be Solved by the Invention> In the above-described cylinder stop device, the mechanical parts that apply or release the brake on the piston rod 5 using the brake members 6 and 7, that is, the arms 15 and 16, the actuator 20, etc., are connected to the cylinder tube. Since it protrudes from 1, it is inconvenient to attach it to a mechanical device, etc., and it may cause wrinkles during operation, and it also has problems such as being large and increasing manufacturing costs.

<Means for Solving the Problems> In view of the above points, it is an object of the present invention to provide a cylinder stop device which has a relatively simple structure, can be made compact, and can reliably lock a piston rod. purpose.

For this purpose, in the cylinder stop device of the present invention, a housing is connected to the distal end of the fluid cylinder, through which the piston rod is slidably inserted, and the piston rod intersects with the axis of the piston rod at an inclined angle within the housing. A hollow chamber having an axis is formed, a brake member is slidably inserted into the hollow chamber, the brake member is provided with a center hole having the same axis as the axis of the piston rod, and the piston rod is inserted into the center hole through a bush. is slidably inserted, an operating chamber is provided in the hollow chamber for supplying pressurized fluid for releasing the brake, and an elastic member for biasing the brake member toward the brake activation side is disposed within the hollow chamber. Ru.

<Operation> In this cylinder stop device, when fluid pressure is applied within the working chamber, the brake member moves in the brake release direction, and the piston rod is movable with the piston rod unlocked.

On the other hand, when the fluid pressure within the operating chamber decreases, the brake member is urged within the hollow chamber in the brake operating direction by the elastic member. This brake member moves axially within the hollow chamber with an inclined axis, but since the axis of its center hole is formed in the same axial direction as the piston rod, the piston rod moves through the bush as the brake member moves. A strong braking force is applied so that the piston rod is lifted parallel to the shaft, that is, perpendicular to the axial direction of the piston rod, and is locked.

This device has a simple structure in which one brake member is built into the hollow chamber in the housing, so it can be made smaller, and there is no protrusion from the housing to the outside, making it easy to handle. .

<Example> Examples shown in FIGS. 1 to 5 will be described below.

30 is a fluid cylinder whose head cover 31
is provided with a pressure fluid port 32, while the
A similar port 34 is provided on the rod cover 33, and a piston rod 36 of the piston 35 projects outward from the rod cover 36.

That is, a connecting portion 37 is provided protruding from the center of the rod cover 33, and the connecting portion 37 is provided with a center hole 38 through which the piston rod 36 is slidably inserted, and a bushing 39 is fitted and fixed in the center hole 38. At the same time, a sealing member 40 is attached.

Reference numeral 41 denotes a housing of a cylinder stop device that is connected to the rod cover 33 via a cover 42, and the mating surfaces 43, 44 of the housing 41 and the cover 42
is formed into an inclined surface perpendicular to the axis of a hollow chamber 47 which is formed to intersect with the axis of the piston rod 36 at a predetermined angle of inclination, as will be described later.

The cover 42 is fixed to the rod cover 33 by passing the connecting portion 37 through the stepped center hole 45 and screwing the tightening member 46 onto a screw threaded on the outer periphery of the connecting portion 37. By bringing the housing 41 into contact with the cover 42 in this state via its mating surface 43 and fixing it with a fastening member (not shown), the housing 41 can be attached to the rod cover 3.
3 are connected in series.

In this connected state, the piston rod 36 is slidably inserted into the center hole 47 of the housing 41. 48 is a bushing fitted and fixed in the center hole 47, and 49 is a sealing member provided in the center hole 47.

Reference numeral 50 denotes a hollow chamber with a circular cross section formed within the housing 41, and the hollow chamber 50 has an axis B--B that intersects the axis A-A of the piston rod 36 at a predetermined inclination angle.

A center hole 47 communicating with the hollow chamber 50 is opened at the tip of the housing 41 . Further, within this hollow chamber 50, a piston-shaped brake member 51 having a stepped portion 51a formed on the outer periphery is arranged along the axis B-B.
It is inserted so that it can slide freely in the direction.

The proximal end surface 52 of the brake member 51 is parallel to the end surface 37a of the connecting portion 37 of the rod cover 33, and the brake release position is when the end surface 52 is in contact with the end surface 37a. A center hole 53 having the same axis as the axis A--A of the piston rod 36 is provided approximately in the center of the brake member 51.

A piston rod 36 is slidably communicated within this central hole 53. 54 is a bushing fitted and fixed in the center hole 53, and 55 is a sealing member provided in the center hole 53.

And the brake member 5 in the hollow chamber 50
On the other end surface side of 1, that is, on the tip surface 56 side,
An operating chamber 57 is formed to which fluid pressure for brake release is supplied from the port 60.

On the opposite side of the working chamber 57, that is, in the space defined in the hollow chamber 50 by the stepped portion 51a and the small diameter portion of the brake member 51 following this, there is a biasing force that presses the brake member 51 toward the working chamber 57. An elastic member (coil spring) 5 that causes the brake to operate.
8 are arranged.

This biasing force of the elastic member 58 is applied to the brake member 5
1 to the left in Fig. 1, the button 54
The piston rod 36 is set to such an extent that the piston rod 36 can be lifted horizontally and locked. In addition, the working chamber 5
7, the brake member 51 is moved to the right in the figure (brake release direction) against the biasing force of the elastic member 58.
Fluid pressure is applied to the extent that it can be moved.

59 is a sealing member fitted to the brake member 51; 60 is an operating chamber 5 provided in the housing 41;
This is a pressure fluid port for 7.

Next, the operation of the cylinder stop device having the above configuration will be explained.

First, the pressure fluid source is activated and the fluid cylinder 3
When pressure fluid is supplied to port 32 of port 60, pressure fluid is simultaneously supplied to working chamber 57 from port 60. Due to the pressure fluid flowing into the working chamber 57, the brake member 51 moves to the right in the figure against the elastic force of the elastic member 58, and its end surface 52 comes into contact with the end surface 37a of the connecting portion 37. In this state, the axis of the center hole 53 of the brake member 51 is aligned with the piston rod 36.
The piston rod 36 is slidable into the center hole 53, and the brake is released.

The pressure fluid supplied from the port 32 causes the piston 35 and the piston rod 36 to move to the left in FIG.
5. The piston rod 36 returns to the right.

On the other hand, if the piston rod 36 is controlled to stop while the piston rod 36 is being moved from side to side or the fluid pressure decreases due to a failure in the fluid pressure system, the fluid pressure in the working chamber 57 decreases.

As a result, when the biasing force of the elastic member 58 that presses the brake member 51 to the left becomes greater than the fluid pressure that presses the brake member 51 to the right,
The brake member 51 slides within the hollow chamber 50 and moves to the left.

At this time, the brake member 51 moves in the direction of the axis B-B of the hollow chamber 50, which intersects the axis A-A of the piston rod 36 at an inclined angle, so that its center hole 53 remains parallel to the axis A-A. , it will move diagonally to the upper left in FIG.

Therefore, the piston rod 36 is lifted horizontally via the bush 54 by the brake member 51, that is, the piston rod 36 is lifted horizontally from the axis A-
The brake load acts in the direction perpendicular to A, and the front and rear parts of the piston rod are pressed against the bush 3.
9, 48, the rod is firmly locked.

In this way, the piston rod 36 is locked horizontally by the brake member 51 via the bush 54, and the bush 36 is
Since the piston rod 36 is held via the brake members 51 and 9, 48, the piston rod 36 is
The rod will not be scratched by scratches, etc., and the rod will not be scratched.

On the other hand, when the fluid pressure is again supplied to the working chamber 57, the brake member 51 is moved to the elastic member 58.
The piston rod moves obliquely downward and to the right along the axis B-B against the elastic force of the piston rod, contacts the connecting portion 37, and the axis of the center hole 53 coincides with the axis A-A of the piston rod 36.
The brake is released.

Note that if the inclination angle of the axis B-B with respect to the above-mentioned axis A-A is too large, the pressing force when applying the brake must be increased, and conversely, if the inclination angle is too small, the stroke of the brake member 51 becomes large. Moreover, the fluid pressure must be increased when the brake is released. Therefore, it is easier to apply the brakes,
Moreover, in order to make it easy to release, it is necessary to set the inclination angle to an optimum value.

Further, since the bushing 54 of the brake member 51 reduces sliding friction, if a bushing made of Teflon is used, the brake can be released smoothly and with a small force.

<Effects of the Invention> As explained above, the cylinder stop device of the present invention has a simple structure in which one brake member is built into the hollow chamber of the housing.
In addition to being compact, there is no protrusion from the housing to the outside, making it easy to attach to machinery, etc., and does not require extra space, making it easy to handle, especially for small and low output fluids. It is suitable for cylinders.

Further, since the piston rod is locked by the brake member so as to be lifted horizontally through the bush, the piston rod is not bitten by the brake member, and the rod can be reliably locked without being damaged.

[Brief explanation of drawings]

1 to 5 show examples of the present invention, in which FIG. 1 is a partially cutaway overall front view, FIG. 2 is a cross-sectional view of the housing, FIG. 3 is a cross-sectional view of the brake member, and FIG.
The figure shows a sectional view of the cover of the housing, FIG. 5 shows a sectional view of the rod cover part of the fluid cylinder, and FIG.
The figure is a partially cutaway front view of a conventional cylinder stop device.
FIG. 7 is a sectional view taken along the - line in FIG. 6. 30...Fluid cylinder, 36...Piston rod, 41...Housing, 50...Hollow chamber, 51
... Brake member, 56 ... Tip surface, 57 ... Working chamber, 58 ... Elastic member.

Claims (1)

[Claims] 1. A housing is connected to the tip of the fluid cylinder, into which the piston rod is slidably inserted,
A hollow chamber having an axis intersecting the axis of the piston rod at an inclined angle is formed in the housing, a brake member is slidably inserted into the hollow chamber, and the brake member has an axis that intersects the axis of the piston rod at an inclined angle. A center hole having the same axis as the piston rod is provided, the piston rod is slidably inserted into the center hole via a bush, and an operating chamber is provided in the hollow chamber for supplying pressurized fluid for releasing the brake. . A cylinder stop device, characterized in that an elastic member for biasing the brake member toward the brake activation side is disposed within the hollow chamber.