JP3685267B2 - Regulator - Google Patents

Description

[0001]
[Industrial application fields]
The present invention relates to a regulator for keeping a coating pressure supplied to a coating gun constant, and more particularly to a regulator for metallic coating.
[0002]
[Prior art]
In metallic painting, when the aluminum piece contained in the painting is crushed, the coating surface turns black.
The cause is that when the pulsation of the paint pressure is generated, the regulator valve body is frequently separated from the valve seat and repeatedly contacted, whereby the aluminum piece in the paint is crushed.
[0003]
That is, as shown in FIG. 4, the conventional regulator includes a valve chamber b communicating with the paint supply hole a, and a valve that opens and closes the paint supply path e by the piston d in the valve opening / closing cylinder c. On the other hand, a pressure adjusting rod k that is displaced at a position that is balanced with the paint pressure while receiving the pressure in the pressure adjusting cylinder i is provided in the pressure adjusting chamber h that communicates with the valve chamber b via the paint supply passage e. When the supply pressure of the paint exceeds the back pressure applied to the piston j of the pressure adjusting rod k, the switching valve m is switched by the retreated pressure adjusting rod k, and the air of the pressurized air supply source n is Leading to the back of the opening / closing cylinder c, the valve f is brought into contact with the valve seat g, the paint supply path e is cut off, and when the paint pressure in the pressure regulating chamber h decreases, the rod k is moved forward to change the switching valve. m is returned, the air supply to the valve opening / closing cylinder c is cut off, and the valve f is moved from the valve seat g By between it is configured to eject a coating material.
[0004]
For this reason, when the pulsation is generated in the supply pressure of the paint and the valve f and the valve seat g are frequently contacted and separated, the aluminum piece in the paint is crushed between them and the paint surface changes to black. This causes inconvenience.
[0005]
[Problems to be solved by the invention]
The present invention has been made in view of such problems, and an object of the present invention is to provide a new regulator capable of adjusting the paint pressure almost constant without applying a strong force to the aluminum piece. It is in.
[0006]
[Means for Solving the Problems]
That is, regulator for the present invention is to achieve such a problem - as data, regulator - is formed on the motor body and paint passage connecting the paint supply port and the paint discharge opening through the valve seat and the pressure regulating chamber If, at one end, a valve portion for closing the paint passage in contact with the valve seat, and a flow rate adjusting section having a groove in which the cross-sectional area smaller in proportion to the paint pressure go to the distal end to narrow the flow provided, at the other end, it provided pressure receiving surface of the pressurized fluid for closing the paint passage, and normally a valve rod which is moved back and forth freely disposed in a state of receiving the urging force substantially balances the paint pressure, to retraction in order to operate the switching valve receives a constant pressure or more paint pressure, and comprising adjusting圧杆to face with the regulating pressure chamber at one end, to act on the pressure receiving surface of the valve stem through the switching valve a source of pressurized fluid, is made of.
[0007]
[Action]
With this configuration, the flow rate adjusting unit is moved forward and backward according to the paint pressure, and an amount of paint that is inversely proportional to the paint pressure flows from a groove having a different cross-sectional area provided on the peripheral surface thereof. Absorbs pressure fluctuations in the paint without applying a large force to the aluminum piece inside, but when a large paint pressure is applied, the pressure regulator is retracted and the switching valve is switched to apply a pressurized fluid to the pressure receiving surface of the valve rod. To act so as to temporarily block the paint flow path.
[0008]
【Example】
Therefore, examples of the present invention will be described below.
1 to 3 show an embodiment of the present invention.
[0009]
In the regulator body indicated by reference numeral 1 in the figure, a paint supply path 7 that reaches the paint discharge port 6 from the paint supply port 2 through the valve chamber 3 and the pressure regulating chamber 5 is L-shaped with the pressure regulating chamber 5 as a boundary. In addition, a valve rod 25 operated by first and second pistons 15 and 23, which will be described later, is provided in the pressure regulating chamber 5 so as to penetrate the valve seat 4, and this pressure regulating chamber is further formed. 5, a pressure adjusting rod 36 that is integral with the pressure adjusting piston 35 is disposed so as to be movable back and forth in a direction orthogonal to the valve rod 25.
[0010]
These parts will be described in more detail. In the regulator main body 1, first and second cylinders 10 and 17 are arranged in tandem, and an air inlet 12 provided in the rear chamber 11 of the first cylinder 10. Is configured such that pressurized air from a control air supply source 41 flows in through a switching valve 38, which will be described later, and the air inlet 21 provided in the front chamber 20 of the second cylinder 17 includes: Further, so that pressurized air flows directly from the control air supply source 41 without passing through the switching valve 38, a paint discharge air supply source 45, which will be described later, is connected to the air introduction port 19 provided in the rear chamber 18. It is comprised so that pressurized air may flow in.
In the drawing, reference numeral 14 denotes an intake / exhaust port provided in the front chamber 13 of the first cylinder 10.
[0011]
These first and second cylinders 10 and 17 are slidably disposed with first and second pistons 15 and 23 fixed to a common valve rod 25. 2 and 3, a valve portion 28 that contacts the valve seat 4 is formed. Further, the valve portion 28 is formed with a flow rate adjusting rod 26 having substantially the same diameter as the hole of the valve seat 4. In this circumferential surface, a notch that becomes shallower toward the tip, that is, a groove 27 that has a cross-sectional area that becomes smaller toward the tip is formed in a direction parallel to the valve rod 25, and is an amount that is inversely proportional to the paint pressure. The coating material can be poured into the pressure regulating chamber 5.
[0012]
On the other hand, the regulator main body 1 is provided with a pressure adjusting cylinder 30 in a direction perpendicular to the first and second cylinders 10 and 17, and an air introduction port 32 provided in the rear chamber 31 has a paint discharge air. The piston 35 is configured such that pressurized air flows from the supply source 45 and is slidably disposed in the cylinder 30. The piston 35 is disposed at the rear end of the pressure adjusting rod 36 facing the pressure adjusting chamber 5. The operating rod 37 that is integrally fixed and further protrudes from the rear of the piston 35 abuts on the switching valve 38 that is constantly urged to the side that discharges pressurized air to the outside. The switching valve 38 is configured to be switched to the air introduction side.
In the figure, reference numeral 34 denotes an intake / exhaust port provided in the front chamber 33 of the cylinder 30.
[0013]
On the other hand, one pipe line 42 extending from the control air supply source 41 via the switching valve 38 is at the air inlet 12 of the first cylinder 10, and the other pipe line 43 is at the front chamber 20 side air introduction of the second cylinder 17. One conduit 46 connected to each of the ports 21 and extending from the paint discharge air supply source 45 is connected to the air introduction port 32 of the pressure adjusting cylinder 30, and the other conduit 47 is connected to the rear chamber side air of the second cylinder 17. The cylinders 10.17.30 are each configured to perform a required operation by being connected to the introduction port 19 and pressurized air from the supply sources 41 and 45, respectively.
[0014]
Next, the operation of the apparatus configured as described above will be described.
Before supplying the paint, one of the pressurized air from the paint discharge air supply source 45 flows into the rear chamber 31 of the pressure adjusting cylinder 30 to move the piston 35 to the right in the figure, and the pressure adjusting rod 36 is moved. While entering into the pressure regulating chamber 5, the pressing force of the switching valve 38 is released and this is positioned on the discharge side. Therefore, a part of the pressurized air from the control air supply source 41 flows into the front chamber 20 of the second cylinder 17 without passing through the switching valve 38, while the other addition from the paint discharge air supply source 45. Since the compressed air flows into the rear chamber 18 of the second cylinder 17, the second piston 23 rises due to the pressure difference between the air supply sources 41 and 45, and the valve portion 28 of the valve rod 25 is moved to the valve seat 4. The coating material supply flow path is closed by being in contact therewith.
[0015]
In this state, since the switching valve 38 is switched to the discharge side, the pressurized air from the control air supply source 41 does not flow into the first cylinder 10.
[0016]
In this state, when the paint flows in from the paint supply port 2, the valve rod 25 reaches a position where the paint pressure acting on the top surface of the flow rate adjusting rod 26 and the air pressure acting on the front surface and the back surface of the second piston 23 are balanced. Retreats to open the paint supply path, and the paint in the valve chamber 3 flows into the pressure regulating chamber 5 through a groove 27 provided on the peripheral surface of the flow rate adjusting rod 26, and from here through the paint discharge port 6. Do not supply paint guns.
[0017]
In this way, the fluctuation of the pressure generated in the paint supply process causes the valve rod 25 to move forward and backward by colliding with the air pressure acting on the back surface of the second piston 20, and when the paint pressure increases, FIG. As shown by the broken line, the flow rate adjusting rod 26 is moved backward to position the shallow portion of the groove 27 in the hole of the valve seat 4, and when the paint pressure is lowered, the valve rod 25 is moved to the solid line position. An amount of paint that is in inverse proportion to the paint pressure is allowed to flow into the pressure adjusting chamber 5 without applying a large force to the aluminum piece so that the deepened portion of the groove 27 is positioned in the hole of the valve seat 4. While absorbing the pressure fluctuation, the paint is supplied to the painting gun.
[0018]
On the other hand, when the paint pressure fluctuates abnormally and suddenly, the pressure adjusting rod 36 entering here is retracted due to the pressure increase in the pressure adjusting chamber 5, and the operation provided at the rear end of the piston 35 is performed. The switching valve 38 is pressed by the rod 37 to switch it to the air introduction side shown in FIG.
[0019]
As a result, the pressurized air from the control air supply source 41 is injected into the rear chamber 12 of the first cylinder 10 through the switching valve 38 and acts on the back surfaces of the first and second pistons 15 and 20 to be controlled by the valves. The collar 25 is pushed up against the paint pressure, and the valve portion 28 is brought into contact with the valve seat 4 to close the paint flow path.
[0020]
As a result, when the paint pressure in the pressure adjusting chamber 5 decreases and the pressure adjusting rod 36 protrudes into the pressure adjusting chamber 5 again, the operating rod 37 at the rear end releases the pressure of the switching valve 38 and moves it to the discharge side. Displaced, the pressurized air is discharged from the rear chamber 11 of the first cylinder 10, and the valve rod 25 is returned to the equilibrium position of the pressurized air and the paint pressure again.
[0021]
【The invention's effect】
As described above, according to the present invention, a valve rod having a valve portion and a flow rate adjusting portion at one end is movably disposed in the flow path of the paint while receiving a biasing force corresponding to the paint pressure. On the other hand, the switching valve is operated to retreat and apply fluid pressure to the pressure receiving surface of the valve rod when it receives a large paint pressure. By passing an amount of paint that is inversely proportional to the pressure, this pressure fluctuation is absorbed without applying a strong force to the aluminum pieces contained in the paint, and the paint pressure supplied to the paint gun is kept constant and the paint pressure is kept constant. The supply of paint can be refused only when the value fluctuates greatly, and adverse effects due to this can be prevented.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view of an apparatus showing an embodiment of the present invention.
FIG. 2 is a cross-sectional view of a main part of the same apparatus shown in an operating state.
FIG. 3 is an enlarged cross-sectional view showing a main part of the apparatus.
FIG. 4 is a diagram showing an example of a conventional device.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Regulator main body 2 Paint supply port 4 Valve seat 5 Pressure regulation chamber 6 Paint discharge port 10 1st cylinder 17 2nd cylinder 25 Valve rod 26 Flow rate adjustment rod 28 Valve part 30 Pressure regulation cylinder 36 Pressure regulation rod 38 Switching valve 41 Control air supply source 45 Paint supply air supply source

Claims (3)

Regulator - a paint passage which is formed in the motor body, and connecting the paint supply port and the paint discharge opening through the valve seat and the pressure regulating chamber,
At one end, a valve portion that contacts the valve seat and closes the paint flow path, and a flow rate adjustment portion having a groove whose cross-sectional area decreases toward the tip to reduce the flow rate in proportion to the paint pressure, A valve rod provided at the other end with a pressure-receiving surface of a pressurized fluid that closes the paint flow path, and that is normally urged to move forward and backward in a state of receiving an urging force substantially balanced with the paint pressure;
A pressure adjusting rod which receives a paint pressure of a certain pressure or more and moves backward to operate the switching valve, and has one end facing the pressure adjusting chamber,
A pressurized fluid supply source that acts on the pressure receiving surface of the valve rod via the switching valve;
A regulator with At the other end of the valve rod, a second piston that receives a pressure of a pressurized fluid that balances the paint pressure, a first piston that receives a pressure of a pressurized fluid that closes the paint flow path, and the pressure regulator The regulator according to claim 1, wherein a pressure adjusting piston that receives a pressure of a pressurized fluid that is balanced against a paint pressure equal to or lower than a predetermined pressure is fixed to the other end of the regulator. While directing pressurized fluid from the coating material discharging air supply to the back surface between the second piston and the upper Sulfur butterfly pressure piston, one of the pressurized fluid from the pressurized fluid supply source, the switching valve 3. The regulator according to claim 2 , wherein the regulator is led to the back surface of the first piston through the first piston.

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