JPH11292500A - Air balancer - Google Patents

Abstract

PROBLEM TO BE SOLVED: To automatically correct the pilot pressure of a pressure regulating valve by providing a stopper so that a pneumatic brake main body coupled with the piston rod of an air cylinder can be slightly moved relatively to the air cylinder in the axial direction of the piston rod. SOLUTION: A brake member 3 is coupled with the piston rod 2 of an air cylinder. When air is discharged from ports 14, 15, the brake member 3 is inclined by springs 8, 9, and initial frictional force is generated between the brake member 3 and the piston rod 2. The brake member 3 and the piston rod 2 are connected by this initial frictional force, and they are moved between both stoppers 4, 5. When they collide with one stopper, the rotating force corresponding to the product of the eccentric quantity between the axis and the stopper and the thrust of the air cylinder 1 is added to the moment inclining the brake member 3 to surely stop the piston rod 2, thereby the internal pressure of the air cylinder 1 can be corrected to the strict balance pressure.

Description

DETAILED DESCRIPTION OF THE INVENTION

[Industrial application field] The field of assembling or processing in which delicate movement such as attachment of a heavy object is desired. Or, when you want to make loading and unloading heavy objects an extremely simple task.

2. Description of the Related Art There are the following various types of prior art devices for moving heavy objects using an air cylinder. Among them, there is a device that moves a heavy object up and down by keeping the pressure in an air cylinder constant by a pressure regulating valve (air operated type pressure reducing valve). (1) Japanese Patent Publication No. 55-40520. (2) Load transfer device JP-A-3-166200. (3) Automatic weight sensing balance lifting device
01700. And air operated friction brake (4) Brake device for air cylinder Japanese Patent Application No. 7-3
08069.

[Problems to be Solved by the Invention] A new air balancer having a mechanism for automatically correcting the pilot pressure of a pressure regulating valve (air operated type pressure reducing valve) for keeping the air cylinder pressure constant. provide.

Means for Solving the Problems An air operation brake for applying a brake by a frictional force is fitted to a piston rod of an air cylinder, and the air operation brake main body is moved relative to the air cylinder in the axial direction of the piston rod. A stopper is provided so as to be able to move slightly (2 to 5 mm), and the pilot pressure of the pressure regulating valve is corrected using the slight movement.

[Operation] FIG. 1 is an axial sectional view of the present invention. FIG. 2 is a partial cross-sectional view of FIG. FIG.
FIG. 2 is a pneumatic circuit diagram used in the present invention. FIG. 4 shows a pressure regulating valve (air operated type pressure reducing valve) used in the present invention.
FIG. In FIG. 1, a brake member 3 fitted to a piston rod 2 of an air cylinder 1
Two air operated pistons 1 when air is supplied from 4, 15
By pressing the stoppers 1 and 12 to the two stoppers 4 and 5 to make a right angle with the piston rod, the brake is released, and when exhausted from the ports 14 and 15, the springs 8 and 9 disengage the brake member 3. By tilting, an initial frictional force is generated between the brake member 3 and the piston rod 2. By this initial frictional force, the brake member is connected to the piston rod 2 and moves between the two stoppers 4 and 5. However, the piston rod is reliably stopped by being added to the moment of tilting the brake member. Next, in FIG. 2, the detection valves 6 and 7 continue to supply or exhaust air until the brake member 3 is positioned in the middle (dead zone) of the stoppers 4 and 5. Next, the operation will be described with reference to FIG. The case where the work is lifted by fixing the head cover of the air cylinder of FIG. 1 to a traveling device or a rotating device positioned at an upper position will be described. The pipe ends 14, 15, 13, 16, in FIG.
Reference numerals 17, 18, and 19 are connected to the same numbered ports in FIGS. First, the valve 20 is operated by lever operation.
Turn ON. Next, air is supplied to all air sources 21. In this state, only the pipe ends 14, 15, and 13 are supplied with air. In this state, the brake member 3 shown in FIG.
Are stopped by air operated pistons 11 and 12
To be perpendicular to the piston rod 2 and in a brake released state, and the detection valves 6 and 7 in FIG. 2 are both in the OF state. In this state, if the up button 22 is kept pressed, the pilot check valve 23
The air is supplied to the pipe end 19, the port 19, and the air cylinder 1. At the same time, through the shuttle valve 24 and the check valve 25, the two pilot check valves 26 are turned on because the pilot pressure is increased. At the same time, the valve 28 is turned on and the valve 29 is turned off through the shuttle valve 27. When the raising button 22 is kept pressed, the air cylinder 1 is supplied with air and is lifted up in a no-load state (hook, link, other jig, etc.). At this point, when the up button 22 is released, the pilot check valve 23 and the check valve 25 are instantly closed, and
The valve 28 also instantaneously enters the exhaust state, but the valve 29 enters the supply state with a short delay by the delay circuit 30. The pipeline ends 14 and 15 are exhausted only during this short delay, and the brake member 3 is coupled to the piston rod 2 by frictional force, and the detection valves 6 and 7 are alternately operated to cause the pipeline ends 19 (air cylinder). (Internal pressure) is immediately corrected to a strict balance pressure. Also, during this short delay time, the two pilot check valves 26 are in communication with the valves 33 and 32. When this delay short time is over, the brake member 3
Is returned to the brake released state, and the pilot chamber of the pressure regulating valve (air operated type pressure reducing valve) 10 is tightly sealed with the strict balance pressure by the two pilot check valves 46. Naturally, the pressure regulating valve 10 used here is of a bleed type in which the secondary pressure and the pilot pressure are equal, as shown in FIG. The state after the above-described procedure is a balanced state when there is no load (including a hook, a link jig, and the like), and the hook and the like can be freely moved up and down. When a load is applied to the hook or the like in the above-mentioned balanced state and the hook or the like is lifted by hand, the connection with the load is established without slack. When the lever 20 is exhausted in this state, the pipe end 1
4 is in the exhaust state, slightly delayed by the throttle 34,
The pipe end 15 is in the exhaust state. Due to this delay, the brake member 3 is put in a braked state at the position where the brake member 3 has moved to the stopper 5 side.
When the air is supplied to the air cylinders 6 and 19 and the air cylinder 1 and a balanced state under a load state is reached, the piston rod 2 and the brake member 3 are lifted, and the detection valve 6 is closed.
During this time, the two pilot check valves 26
A communication state is established by 3 and 32. Next, when the lever 20 is in the air supply state, the pipeline ends 14, 15 are in the air supply state,
The air operation pistons 11 and 12 press the brake member 3 against the stoppers 4 and 5 to release the brake,
In addition, the pilot pressure of the two pilot check valves 26 is exhausted from the valve 33, and the pilot chamber of the pressure regulating valve 10 is sealed with the balance pressure under load. In this state, the load can be freely moved up and down. Next, again, lever 2
When 0 is set to the exhaust state, as described above, the brake is applied, and a new balance state is instantaneously obtained with respect to the load fluctuation (loading / unloading) at the intermediate position. next,
When automatically setting the load to the no-load state, the lever 20 is set to the air supply state, and the depression button 35 is kept pressed (air supply state)
The air in the air cylinder 1 is exhausted from the pilot check valve 23, and the load descends and lands. (The brake and the detection valve 6 operate only for a very short time), which is absorbed by the slack. At the same time, the pilot pressures of the two pilot check valves 26 are in communication with each other through the shuttle valve 24 and the check valve 25 while the down button 35 is pressed, and subsequently, the valve 33 is operated while the delay circuit is operating. , 32. Therefore, the above-mentioned operation of releasing the lowering button automatically seals the balance pressure at the time of no load in the pilot chamber of the pressure regulating valve 10, and can freely move up and down after the load is removed. Then, when the piston rod 2 comes out using a link or a pulley or the like, a pipe end 14 is connected to the port 15 and a pipe end 15 is connected to the port 1 for a mechanism for lifting the load.
4 can be connected.

[Embodiment] FIG. 1, FIG.
FIG. 3 and FIG. 4 are examples including all the embodiments described in the claims of the present invention. However, when only a part of the effects of the invention described below is aimed at, The use of the brake mechanism and the air circuit described above is enabled. For example, a mechanism in which the housing slightly moves between the stoppers by using a normal air cylinder brake device (the prior art section, 4.) can be used.
Of the delay circuit 50 of FIG.
It is also possible to manually confirm with 35.

[Effects of the Invention] (1) The pilot pressure of the pressure regulating valve can be strictly and automatically corrected, which leads to a reduction in operating force in a balanced state. (2) It is possible to load and unload a load at an intermediate position (space). (3) The balance at the time of load can be automatically performed by one-touch operation. (4) Since the pressure chamber for the load sensor is not required, the entire structure can be made extremely small.

[Brief description of the drawings]

FIG. 1 is an axial sectional view of the present invention.

FIG. 2 is a partial cross-sectional view of a 90-degree rotation of FIG. 1;

FIG. 3 is a pneumatic circuit diagram used in the present invention.

FIG. 4 is a sectional view of a pressure regulating valve used in the present invention.

[Explanation of symbols]

(1) is an air cylinder. (2) is a piston rod.
(3) is a brake member. (4) and (5) are stoppers.
(6) and (7) are detection valves. (8) and (9) are springs. (10) is a pressure regulating valve (air operated type pressure reducing valve). (11) and (12) are air operated pistons. (1
3), (14), (15), (16), (17), (1)
8) and (19) are pipe ends and connection ports. (20) is a valve operating lever. (21) is the air source. (22) is an up button, and (35) is a down button. (23) and (26) are pilot check valves. (24), (27) and (31) are shuttle valves, and (25) is a check valve. (28), (2
9), (32) and (33) are switching valves. (30)
Is a delay circuit, and (34) is an aperture. (40) and (41) are diaphragms, and (42) is a connecting rod. (43), (44),
(45) is a connection port.

Claims (3)

[Claims] A piston rod (2) of an air cylinder (1) is fitted with an air operation brake (3) which is attached to and detached from the outer peripheral surface of the piston rod by frictional force, and the air operation brake is moved in the axial direction of the piston rod. Stoppers (4) and (5) are provided so as to be capable of slight movement relative to the air cylinder, and the pressure adjustment valve (air) connected to the air cylinder is provided by the relative movement of the air operation brake. An air balancer for correcting the pilot pressure of an (operating type pressure reducing valve) (10). 2. A brake member (3) fitted to a piston rod (2) of an air cylinder (1), springs (8) and (9) for inclining the brake member, and an inclination of the brake member. 2. The air balancer according to claim 1, wherein the air operation pistons (11) and (12) for restoring are provided at positions away from the axis. 3. The air balancer according to claim 2, wherein the exhaust of the two air-operated pistons (11) and (12) is different.