JPH0716085Y2 - Fluid cylinder deceleration stop device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of use] The present invention relates to a deceleration stop device for accurately stopping a fluid pressure cylinder at an arbitrary position.

[Prior Art] A fluid pressure cylinder used in an industrial machine may be required to be stopped at an arbitrary position. In order to accurately stop the fluid pressure cylinder at this position, a deceleration stop is required. is necessary.

Conventionally, as a deceleration stop device for a fluid pressure cylinder, JP-A-60
The one disclosed in JP-A-267313 is known.

However, the above-described known deceleration stop device is dangerous if an operator touches the deceleration brake cover exposed to the outside by mistake, and also causes a malfunction when a jig or tool touches it. Then, there is a problem that the vehicle cannot be accurately stopped at the stop position.

Further, since the accumulator and the like are installed outside the deceleration stop device, there is a problem that the installation space of the entire device becomes large and installation on site requires labor.

[Problems to be solved by the invention] The problem to be solved by the present invention is to provide a movable cylinder, an accumulator and the like in a deceleration stop device so that there is no danger or malfunction and the fluid pressure cylinder is easy to install. To provide a deceleration stop device.

[Means for Solving the Problems] In order to solve the above problems, a deceleration stop device of the present invention is a deceleration stop device for a fluid pressure cylinder that decelerates and stops a fluid pressure cylinder. A body mounted in the axial direction, an oil chamber and an accumulator installed in the body, a brake piston that slides in the oil chamber, and a flow path that connects the oil chamber and the accumulator formed in the body. And a flow path resistance in the flow path, and a brake mechanism for gripping a piston rod of a fluid pressure cylinder is internally provided in the brake piston.

[Operation] When the brake mechanism installed in the brake piston grips the piston rod near the stop position of the fluid pressure cylinder, the brake piston slides in the oil chamber, and the oil in the oil chamber passes through the flow passage having the flow passage resistance. As the brake piston decelerates and stops buffering at the stroke end by flowing out through the accumulator, the fluid pressure cylinder can be accurately stopped at the stop position.

The moving parts such as the brake piston and brake mechanism are
Since both of them are installed in the body of the deceleration stop device, it is possible to prevent the danger of the operator and the malfunction of the device.

Further, since the accumulator, the flow path and the like are also provided inside the body, the installation space of the entire apparatus can be reduced and the installation at the site is easy.

[Embodiment] FIG. 1 shows a first embodiment of the present invention.
11 is attached to the rod side of the fluid pressure cylinder 12 by an appropriate means (not shown), and the piston rod 13 of the cylinder 12 penetrates the body 15 of the deceleration stop device 11.

A pair of cylinder chambers in the body 15 formed by the partition wall 16 are metal-sealed to slide the brake piston 17A,
The brake pistons 17A and 17B are divided into oil chambers 18a and 18b by 17B, and the return pistons 19A and 17B are compressed into the oil chambers 18a.
Is urged toward the partition wall.

The accumulators 21, 21 provided inside the body 15 are formed in a ring shape from a material such as foamed rubber, and one of them is a variable throttle 22 that constitutes a flow path resistance and a non-return block that blocks the inflow of oil from the oil chamber side. A plurality of flow paths 24 each having a valve 23 communicate with the oil chamber 18a and the other communicates with the oil chamber 18b.

Therefore, when the brake pistons 17A, 17B slide toward the oil chamber 18a, the brake pistons 17A, 17B are decelerated and stopped by the oil flowing into the accumulator 21 through the variable throttle 22, and the return spring 19 is attached. When sliding toward the oil chamber 18b due to the force, the oil quickly returns to the oil chamber 18a through the check valve 23 and returns to the oil chamber 18a.

Instead of the variable throttle 22, a fixed throttle or a plurality of orifices whose opening area is gradually reduced by sliding can be used.

The brake pistons 17A, 17B have brake mechanisms 26A, 26B for holding the piston rod 13 installed therein.

FIG. 2 shows an example of the brake mechanism 26A. The brake piston 17A is partitioned into a brake chamber 28 and a release chamber 29 by a brake cam 27 that slides inside, and the brake chamber 28A
The brake spring 30 is contracted to a breathing port 31 communicating with the brake chamber 28 and a release port 32 communicating with the release chamber 29. Also, the brake piston 17A
Has a protruding portion 33 that slides in the partition wall 16 as shown in FIG. 3, so that the port 32 and the like open in the partition wall 16 even if the brake piston 17A slides to the left in the drawing. is doing.

The brake arm 35, ...
Near the base end is swingably supported by a bearing portion formed on the brake piston 17A, and the cam surface 27a of the brake cam 27 is attached to the tip end.
The shoe holder 36 has a concave portion into which the convex portion of the shoe holder 36 fits, and the roller that abuts on the piston rod 13 is attached to the shoe holder 36.
A brake shoe 37 for pressing and gripping is provided.

On the other hand, the brake mechanism 26B provided inside the brake piston 17B has a mirror image relationship with the brake mechanism 26A.

Directional switching valve 39 for supplying / discharging pressure fluid to / from the release chamber 29
Output ports A and B by exciting the solenoids 39a and 39b.
Is connected to the pressure fluid supply port P and the discharge ports EA and EB by switching, and the solenoid valves 39a and 39b are both 5-port valves that connect the output ports A and B to the supply port P at the neutral position of non-excitation. The port A communicates with the release port 32 of the brake mechanism 26A, and the port B communicates with the release port 32 of the brake mechanism 26B.

The brake mechanisms 26A and 26B are configured such that the diameter of the roller is expanded by the cam surface 27a of the brake cam 27 that slides by the urging force of the brake spring 30, and the brake arms 35, ... 37 is the piston rod
13 is pressed and gripped, and the pressure fluid supplied to the release chamber 29 slides the brake cam 27 in the opposite direction to release the pressure grip of the piston rod 13 by the brake shoe 37. However, the brake mechanism
26A and 26B are not limited to those shown in FIG. 2, but the brake spring 30 may be omitted and the brake cam 27 may be provided by the pressure fluid supplied from the port 31 or by the combination of the pressure fluid and the brake spring. It may be driven, or may be one that grips the piston rod 13 using a solenoid or an electrostrictive element.

Next, the operation of the first embodiment will be described.

In the state shown in FIG. 1, the direction switching valve 39 is in the neutral position, and the brake mechanisms 26A, 26B release the grip of the piston rod 13 by the pressurized air supplied to the release chambers 29, 29. Therefore, when pressure air is supplied to the pressure chamber on the head side of the fluid pressure cylinder 12 by a direction switching valve (not shown), the piston 14 and the piston rod 13 move left in the figure.

When the position detection mechanism (not shown) detects that the piston 14 or the load (not shown) approaches the stop position and excites the solenoid 39a, the pressure air in the release chamber 29 of the brake mechanism 26A is discharged to the outside. Brake mechanism 26
Since A grips the piston rod 13 under pressure, the brake piston 17A moves leftward in the figure together with the piston rod 13, and the oil in the oil chamber 18a flows into the accumulator 21 through the flow passage 24 and the variable throttle 22 and the brake piston 17A Decelerates and stops at the stroke end in a buffer manner, whereby the fluid pressure cylinder 12 decelerates and accurately stops at the stop position.

When the solenoid 39a is deenergized, the directional control valve 39 is returned to the neutral position, and when the supply and discharge of the pressure fluid to the fluid pressure cylinder 12 is reversed, the piston 14 and the piston rod 13 move to the right in the figure, and the brake piston 17A Is returned to its original position by the urging force of the return spring 19, so that the oil accumulated in the accumulator 21 flows back to the oil chamber 18a through the flow path 24 and the check valve 23.

When the solenoid 39b is excited during the stroke of the piston rod 13 to the right in the figure, the brake mechanism 26B grips the piston rod 13 and the fluid pressure cylinder 12 decelerates to the stop position in the same manner as the stroke to the left. Stop exactly.

In the first embodiment, since the movable parts such as the brake pistons 17A and 17B and the brake mechanisms 26A and 26B are provided in the body 15, it is safe even if a hand or the like touches the device by mistake, and there is a risk of malfunction. Absent. Further, since the accumulator 21, the variable diaphragm 22 and the like are provided in the body 15, the space of the entire apparatus is small,
And it is easy to install on site.

FIG. 4 shows a second embodiment of the present invention, in which the body 42 of the deceleration stop device 41 in the second embodiment has a central cylinder chamber and piston-type accumulators on both sides by partition walls 42a and 42b.
It is divided into 43A and 43B, and the cylinder chamber is equipped with a brake piston 45 in which a brake mechanism 44 is installed.
Is a body 42, a brake piston 45, and an accumulator
It penetrates the floating pistons 46a and 46b of 43A and 43B. Also,
The oil chambers 18a, 18b partitioned by the brake piston 45 and the pressure accumulating chambers 48a, 48b inside the floating pistons 46a, 46b are separated by a partition wall 42.
a plurality of flow paths 2 each having variable throttles 22 and 22 provided on a and 42b and check valves 23 and 23 for blocking the inflow of oil from the oil chamber to the accumulator chamber
Ports 51a and 51b for supplying and discharging pressurized air are opened in the air chambers 50a and 50b outside the free pistons 46a and 46b, respectively.

The brake mechanism 44 has the same structure as the brake mechanism 26A, and the direction switching valve 52 that supplies and discharges pressurized air to and from the brake mechanism 44 includes an output port C and a supply port P and an exhaust port by exciting and releasing the solenoid 52a. The output port C communicates with the relief port of the brake mechanism 44. Also,
The direction switching valve 53 that supplies and discharges pressurized air to and from the air chambers 50a and 50b is
It is composed of a 5-port valve that connects the output ports D and E to the supply port P and the discharge ports ED and EE by exciting the solenoids 53a and 53b, and the port D is the port 51a.
The port E communicates with the port 51b.

The second embodiment is based on the brake piston 45 and the floating piston.
In the state shown in FIG. 4 in which the strokes 46a and 46b are at the right stroke end, the solenoid 52a is excited to release the gripping of the piston rod 13 by the brake mechanism 44, and the pressure chamber on the head side of the fluid pressure cylinder 12 (shown in the figure). When pressurized air is supplied to and discharged from (omitted), the piston rod 13 moves left in the figure.

When it detects that the piston 14 or the load is close to the stop position, and the excitation of the solenoid 52a is released, the brake mechanism 44 press-holds the piston rod 13, and the brake piston 45 moves left in the figure to move the oil chamber 18a. Since the oil flows out through the variable throttle 22 into the accumulator chamber 48a, the accumulator 43A
The fluid pressure cylinder 12 is decelerated by this to stop at the stop position as a buffer.

The solenoid 52a is excited to release the grip of the piston rod 13 by the brake mechanism 44 and the solenoid 53b.
To supply pressured air to the air chamber 50b to reverse the supply and discharge of pressured air in the fluid pressure cylinder 13, the piston rod
13 moves to the right in the figure. The deceleration stop of the fluid pressure cylinder when the piston rod 13 moves to the right is the same as that when the piston moves to the left, and therefore detailed description is omitted.

In the second embodiment, the fluid pressure cylinder can be decelerated and stopped by one brake piston 45 regardless of the sliding direction of the piston rod 13, and the piston type accumulators 43A and 43B can greatly change the volume of the oil chamber. Therefore, the deceleration function can be increased.

[Advantages of the Invention] The deceleration stop device of the present invention is safe because the movable part is not exposed to the outside because the brake cylinder having the brake mechanism for gripping the piston rod is provided inside the device. In addition, since the malfunction does not occur even if there is an external influence such as the touch of the jig or tool, the fluid pressure cylinder can be accurately stopped at an arbitrary position.

Further, since the accumulator, the flow path resistance and the like are provided in the deceleration stop device, the installation space of the entire device can be reduced and the installation on site is easy.

[Brief description of drawings]

FIG. 1 is a schematic configuration diagram of a first embodiment of the present invention, FIG. 2 is a vertical sectional front view showing an example of a brake mechanism, and FIG. 3 is a vertical sectional schematic view showing an essential part of the brake mechanism of FIG. FIG. 4 is a schematic configuration diagram of a second embodiment of the present invention. 11,41 ...... Deceleration stop device, 12 ... Fluid pressure cylinder, 13 ...
… Piston rods, 17A, 17B, 45 …… Brake pistons,
18a, 18b …… Oil chamber, 21,43A, 43B …… Accumulator, 22
..Variable throttle, 24 ... flow path, 26A, 26B, 44 ... Brake mechanism

Claims (1)

[Scope of utility model registration request] 1. A deceleration stop device for a fluid pressure cylinder for decelerating and stopping a fluid pressure cylinder, wherein the deceleration stop device is a body mounted in the axial direction of the fluid pressure cylinder, an oil chamber installed in the body, and An accumulator, a brake piston that slides in the oil chamber, a flow path that connects the oil chamber and the accumulator formed in the body to each other, and a flow path resistance in the flow path, the brake piston, A deceleration and stop device for a fluid pressure cylinder, characterized in that a brake mechanism for gripping a piston rod of the fluid pressure cylinder is internally provided.