JPS645323B2 - - Google Patents

Description

[Detailed Description of the Invention] (Field of Industrial Application) The present invention enables work to be carried out in zero gravity by applying a lifting force equal to the weight of the object when lifting it using an air cylinder. This invention relates to an air pressure adjustment device used in an air balancer.

(Prior art) When operating a lifted object, there is a prior art of a lifting device that can be freely raised and lowered in a balanced state during operation, and can also function as a hoist for raising and lowering by operating a handle. Although there is a previous invention patent No. 810332 (Japanese Patent Publication No. 810332 (Japanese Patent Publication No. 50-3544) of the present applicant), since the previous invention used a piston valve as a valve, it required an oiler for lubrication of sliding surfaces, and oil contamination from the exhaust port was caused. In addition, there was a risk of valve failure if the oil ran out, and the valve occasionally required disassembly and cleaning.

Also, one side of the diaphragm installed in the valve chamber is opened to the atmosphere, and the other side receives the adjustment pressure.
An air pressure regulating valve is also known in which the air opening side is pressurized by an adjustable pressure spring and the inflow valve or release valve is opened by displacement of a diaphragm due to the force relationship between the two. (For example, JP-A-53-104427) (Problem to be solved by the invention) The present invention uses a diaphragm valve in place of the piston valve used in the invention of Patent No. 810332, and also uses a valve pusher of the known air pressure regulating valve. A second pressure spring having a pressure force in the same direction as that of the second pressure spring is disposed outside of the first pressure spring, and by the cooperation of both pressure springs, one operating handle can be used to balance, raise, and
To provide an air pressure adjusting device for an air balancer that allows easy and light switching between lowering and power-off.

Although it is possible to provide a second pressure adjustment screw in the above-mentioned patent No. 810332, in this case, the screw is installed on the back side of the first pressure adjustment screw, which is not only inconvenient to use, but also small in structure. Only valve springs can be applied, the set pressure is also limited, and it cannot be used for quite large hanging tools like the second pressure spring used in the present invention described later.

The present invention also aims at improving this point.

(Means for Solving the Problems) To explain the structure of the present invention for achieving the above object, the present invention provides an air pressure regulating device for an air balancer that includes a valve chamber, a pressure regulating spring, and an operating section. The valve chamber portion includes a valve chamber 1, a diaphragm 2, and an inflow valve body 5.
and an open valve body 7, the diaphragm 2 partitions an open chamber a communicating with the atmosphere and a regulating pressure chamber b, and has an open hole 2a in the center, and the regulating pressure chamber b has a source pressure intake hole 3. , an adjustment pressure outlet hole 4, an inflow valve body 5, and an open valve body 7, the open valve body 7 opens and closes the open hole 2a of the diaphragm 2, and the inflow valve body 5 opens and closes the open hole 2a of the diaphragm 2.
The pressure regulating spring section has a first pressure spring 12 and a second pressure spring 20, and the first pressure spring 12 opens and closes the open chamber a.
It is housed together with a spring receiver 10 and a valve pusher rod 8 inside a spring cylinder 9 attached to the outside of the cylinder, and moves in the axial direction within the cylinder, and has an adjustment screw 11 at one end.
The other end is in contact with the spring tray 10, and the valve pusher rod 8
has one end in contact with the other side of the spring receiver 10 in a loosely fitted state, and the other end in contact with the diaphragm 2, the spring receiver 10 has a pin 13 on the outer periphery, and the pin 13 is provided in the spring tube 9. The second pressure spring 20 protrudes outside the cylinder through the elongated hole 14 in the front-rear direction, and is disposed outside the first pressure spring 12 to apply a pressure force in the same direction as the first pressure spring 12. It has an adjustment screw 20' at one end, and the other end comes into contact with an intermediate portion between the spring receiver 10 of the valve pusher rod 8 and the diaphragm 2 through a lever 21 to pressurize the diaphragm 2. The operating section includes a cam barrel 15 that is loosely fitted into the spring barrel 9 so as not to move in the axial direction, and an operating handle 19 for rotating the barrel. A raising cam 16, a lowering cam 17, and a stop cam 18 are provided to guide the raising cam 1.
6 acts on the valve pusher rod 8 in the pressure direction through the pin 13 and the spring receiver 10, the lowering cam 17 acts on the valve pusher rod 8 in the pressure release direction, and the stop cam 18 acts on the valve pusher rod 8 in the pressure release direction. This relates to an air pressure adjusting device for an air balancer that acts only on the spring 12 in the pressure release direction.

FIG. 4 shows an example of an air balancer to which the device of the present invention is applied, and in the figure, 6 is the balancer body, 6' is the hook, 6'' is the hanging tool, 22 is the booster relay,
2' indicates a first diaphragm, and 23 indicates a second diaphragm.

(Function) To explain the function of the present invention with reference to the drawings, the first
When the pin 13 is apart from each cam as shown in the figure, the operating handle 19 is held at the neutral position (balanced state) in Figure 4 by the balance of the handle itself, an attached weight, a spring (not shown), etc. The inlet valve element 5 and the release valve element 7 of the diaphragm 2 are closed.

Next, when an item is attached to the hook 6' of the balancer 6 and the adjustment screw 11 is gradually tightened, the first pressure spring 12 contracts and the push rod 8 pushes the diaphragm 2 to close the open valve body 7 and the inflow valve body 5. Open the
Air flows into the adjustment pressure chamber b on the other side of the valve chamber, pushing the diaphragm 2 against the push rod 8, and the flow ends when the forces of both are balanced, and the balancer lifts the same weight as the item. Each valve body closes as force is gained.

If you lift the item by hand, the pressure inside the cylinder of the balancer 6 will drop slightly and the force of the first pressure spring 12 will become stronger, so the diaphragm 2 will be pushed toward the adjustment pressure chamber b. The inflow valve body 5 opens and the article can be moved easily.

Furthermore, when an attempt is made to push down the item by hand, the pressure inside the cylinder of the balancer 6 increases slightly, causing the pressure spring 12 to contract, causing the valve pusher rod 8 to retreat and release the valve body 7.
In this case as well, the item can be moved easily since it opens.

Next, when the operation handle 19 is operated to cause the raising cam 16 to act on the pin 13, the valve push rod 8 is moved to the inflow valve body 5.
When the valve is opened, the adjustment pressure increases and the item rises, and when the lowering cam 17 is applied, the first pressure spring 12 is compressed via the pin 13, and the pressure of the valve push rod 8 is released, so the opening valve body 7 opens, the pressure inside the balancer is reduced and the item is lowered.

When the user then releases the operating handle 19, the handle is returned to the neutral position and the item is balanced against the spring pressure.

Also, when the pin 13 is locked to the stop cam 18,
The operating handle 19 remains in this position and the first pressurizing spring 12 does not pressurize the diaphragm 2, so the open valve body 7 remains open and the balancer is powered off, allowing you to release your hand from the operating handle 19. It also has a clasp, so you can drop it down and remove the item.

When attaching a heavy hanging tool 6" (Fig. 4) to the balancer, the hook will fall to the lowest position when the power is turned off, causing an inconvenience. In this case, use the balancer to balance the weight of the hanging tool 6". is necessary.
A second pressure spring is used to achieve this purpose.

To do this, first attach only the hanging tool 6'' to the hook 6', turn off the operating handle 19, and tighten the second adjustment screw 20'.The second pressure spring 20 is compressed and the lever 21 The valve pusher rod 8 acts on the diaphragm 2, and the hanging tool 6'' is held in a balanced state. Next, attach the item to the hanging tool 6'', set the operating handle 19 to the neutral position, operate the first adjusting screw 22, and adjust the first pressure spring 12 as described above.
When tightened, the balancer obtains a lifting force equal to the weight of the lifting device + the item.

In this way, both the first and second adjustment screws 12, 2
By adjusting 0', if the operating handle 19 is locked to the stop cam 18 when the item is pulled down onto a table in the hand position to remove it from the hanging tool 6'', the second pressure spring 20 is activated. Since the diaphragm 2 is pressurized, even if the item is removed, the hanging tool 6'' remains at the stop position, which is convenient for hanging the next item.

(Embodiment) FIG. 1 is a central vertical sectional front view of an embodiment of the air pressure adjusting device for an air balancer of the present invention, and FIG. 2 is a plan view of a cam cylinder.

In the drawing, reference numeral 1 designates a valve chamber, which is partitioned by a diaphragm 2, with one side being an open chamber a to the atmosphere and the other side being a regulating pressure chamber b, and the displacement of the diaphragm 2 toward the regulating pressure chamber allows the source pressure P to be reduced. An inflow valve body 5 is provided in the flow path when the pressure flows into the regulating pressure chamber b, and a release valve body 7 is provided in a portion where the regulating pressure chamber b is opened to the atmosphere by displacement toward the open chamber a side. and the open valve body 7 are connected by a connecting rod 8'.

9 is a spring tube attached to the outside of the open chamber a;
A valve pusher rod 8, a spring tray 10 and an adjustment screw 1 are installed in the cylinder.
One end of the valve push rod 8 is brought into contact with the spring receiver 10, and the other end is brought into contact with the diaphragm 2.

15 is a cam cylinder fitted into the spring cylinder 9, and a raising cam 16, a lowering cam 17 and a stop cam 18 are provided on the cylinder surface.
are arranged in series, an operating handle 19 is attached to a part thereof, and the pin 13 attached to the spring receiver 10 is sequentially linked to each cam. Reference numeral 14 indicates a long hole bored in the spring tube 9 to allow the pin 13 to move forward and backward.

Reference numeral 20 denotes a second pressure spring with an adjustment screw disposed on the outside of the pressure spring 12, which applies a pressure force to the second pressure spring 20 in the same direction as the pressure spring 12, and A second adjustment screw 20' is attached to one end of the second pressure spring 20, and a lever 21 is attached to the opposite end, so that the force point thereof is linked to the valve pusher rod 8.

FIG. 3 shows a modification of the lever that is brought into contact with the second pressure spring 20. In this way, the first pressure spring 1
2 is weak and allows the operation handle 19 to be operated easily.

The air pressure adjustment device shown in Figure 1 is mainly for small balancers, and in the case of medium-sized balancers, the pressure force of the pressure spring is strong, so the pressure spring is placed in a position where the spring force is weak, as shown in Figure 3. It is sufficient to use a lever that works, but in the case of large balancers, as the air flow rate increases, the inlet valve element and opening valve element need to have larger cross-sectional areas, and the diameter of the diaphragm must also be increased. Must be.

The reason for this is that when the valve is closed, due to the pressure difference between the inside and outside, the valve is pressed against the valve seat with a force equal to the cross-sectional area of the valve multiplied by the pressure difference. This force impairs the sensitivity of the diaphragm, which must act in response to small pressure changes. To prevent this negative effect, it becomes necessary to increase the diameter of the diaphragm.

However, if the diaphragm and valve are made larger in order to achieve the response sensitivity required for the balancer, the pressure spring also becomes stronger and exceeds the limit of manual steering operation.

In such a case, a booster relay 22 as shown in FIG. 4 may be used in the main circuit, and the device of the present invention may be used therein for generating signal pressure. The booster relay 22 has almost the same structure as the pressure regulating valve described above, and has a second diaphragm 23 provided in the valve chamber and applies a signal pressure to it to act as an air spring and oppose the diaphragm 2'.
At this time, if the diameters of both the first and second diaphragms are the same, the signal pressure and the adjustment pressure generated by the booster will be the same and balanced. Note that the signal pressure has a very small flow rate, so a small pressure regulating valve is sufficient.

(Effects) The air pressure adjusting device of the present invention is applied to an air balancer to perform a good balancing action, and also functions as a hoist for lifting and lowering. The weight can be balanced by the action of a spring, and each of these operations can be performed easily and quickly using a single operating handle, eliminating the possibility of mistakes. Furthermore, since an oiler is not required, there is no oil contamination from the exhaust port. There is no need to worry about malfunctions due to lack of oil or the hassle of refueling and maintenance.

If the same operation is to be repeated on mass-produced products, it is recommended to set the first and second pressure springs in advance so that repeated operations can be performed quickly by simply operating the operating handle. play.

[Brief explanation of drawings]

Fig. 1 is a central longitudinal sectional front view of the air pressure regulating device for an air balancer of the present invention, Fig. 2 is a plan view of the switching cam, Fig. 3 is a view showing a modification of the lever for the second pressure spring, and Fig. 4 is FIG. 2 is a schematic diagram showing how the device of the present invention is used. 1: Valve chamber, 2: Diaphragm, 3: Reduced pressure intake hole, 4: Adjusted pressure outlet hole, 5: Inflow valve body, 7: Opening valve body, 8: Valve push rod, 10: Spring receiver, 12: Pressure spring , 15: cam cylinder, 16, 17, 18: cam, 19: operating handle, 20': second pressure spring.

Claims (1)

[Scope of Claims] 1. An air pressure regulating device for an air balancer consisting of a valve chamber, a pressure regulating spring, and an operating section, wherein the valve chamber includes a valve chamber 1, a diaphragm 2, an inflow valve 3, and an open valve body. 7, the diaphragm 2 partitions an open chamber a communicating with the atmosphere and a regulating pressure chamber b, and has an open hole 2a in the center, and the regulating pressure chamber b has a source pressure intake hole 3 and a regulating pressure outlet. It has a hole 4, an inflow valve body 3, and an open valve body 7, the open valve body 7 opens and closes the open hole 2a of the diaphragm 2, and the inflow valve body 5 opens and closes the source pressure intake hole 3. The pressure spring section has a first pressure spring 12 and a second pressure spring 20, and the first pressure spring 12 is connected to the open chamber a.
It is housed together with a spring receiver 10 and a valve pusher rod 8 inside a spring cylinder 9 attached to the outside of the cylinder, and moves in the axial direction within the cylinder, and has an adjustment screw 11 at one end.
The other end is in contact with the spring tray 10, and the valve pusher rod 8
has one end in contact with the other side of the spring receiver 10 in a loosely fitted state, and the other end in contact with the diaphragm 2, the spring receiver 10 has a pin 13 on the outer periphery, and the pin 13 is provided in the spring tube 9. The second pressure spring 20 protrudes outside the cylinder through the elongated hole 14 in the front-rear direction, and is disposed outside the first pressure spring 12 to apply a pressure force in the same direction as the first pressure spring 12. It has an adjustment screw 20' at one end, and the other end comes into contact with an intermediate portion between the spring receiver 10 of the valve pusher rod 8 and the diaphragm 2 through a lever 21 to pressurize the diaphragm 2. The operating section includes a cam barrel 15 that is loosely fitted into the spring barrel 9 so as not to move in the axial direction, and an operating handle 19 for rotating the barrel. A raising cam 16, a lowering cam 17, and a stop cam 18 are provided to guide the raising cam 1.
6 acts on the valve pusher rod 8 in the pressure direction through the pin 13 and the spring receiver 10, the lowering cam 17 acts on the valve pusher rod 8 in the pressure release direction, and the stop cam 18 acts on the valve pusher rod 8 in the pressure release direction. An air pressure adjustment device for an air balancer, characterized by having the above-mentioned parts that lock and act only on the first pressure spring 12 in the pressure release direction.