JPH088378Y2 - Liquid flow control valve - Google Patents

Description

[Detailed description of the device]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a liquid flow rate adjusting valve used for adjusting the amount of paint delivered to a coating machine such as a spray gun.

[0002]

2. Description of the Related Art For example, in the coating of automobile bodies, the uniformity of the coating film is an important requirement for obtaining a beautiful finish by an automatic coating machine. However, from the viewpoint of coatability, it is necessary to intentionally thicken the coating film depending on the part of the vehicle body, and the amount of paint discharged from a coating machine such as a spray gun is
It is required to adjust quickly and accurately in response to the fluctuation of the required film thickness.

Therefore, as a flow rate adjusting mechanism satisfying the above required performance, there is one disclosed in Japanese Utility Model Publication No. 2-31167. That is, this known example is composed of "a pulse drive unit including a pulse motor having an encoder, a motion conversion mechanism for converting a rotary motion into a linear motion, and a flow rate adjusting unit having a needle valve. The parts are arranged in an isolated arrangement and connected to a cable, and the rotation of the pulse motor due to a pulse signal is transmitted to the flow rate adjusting part via the cable, and the transmitted rotation is converted into a linear motion and transmitted to the needle valve. The structure is such that the delivery amount is adjusted by the forward / backward movement of the needle valve synchronized with the pulse signal.

[0004]

The above-mentioned known liquid flow rate adjusting mechanism, when used for the paint adjustment of a coating machine, has the function of adjusting the paint delivery amount quickly and accurately. However, the cable connected to the pulse driving unit and the flow rate adjusting unit for transmission of rotation between them is limited to a length of about 5 meters or less in order to smoothly transmit rotation. It is necessary to make it larger than about 1 meter,
Lack of practicality for mass-produced painting machines in factories that require highly flexible layout performance within a limited space.
・ Because there is a rotation transmission mechanism and the transmission part is easily worn, the maintenance cost for maintaining an accurate flow rate adjustment function is high. ・ The movement adjustment mechanism is present in the flow rate adjustment part, so the flow rate adjustment part There are various practical problems as described above, which are enormous and heavy.

The present invention provides a liquid flow rate adjusting valve which solves the above-mentioned problems of the prior art.

[0006]

The flow rate adjusting valve of the present invention which solves the above technical problems is "a flow rate adjusting valve in which a needle valve that is movable back and forth is provided in the main part, and the flow rate of liquid is adjusted by the needle valve. A notch blade ring having a notch blade annularly provided, and a plurality of operating blades that are movable forward and backward and individually engage with the notch blade at a forward position, and the notch is formed by sequentially engaging the operating blades with the notch blade. A rotation output shaft of an air stepping motor for angularly rotating a blade ring and the needle valve are connected in a straight shape, and an operation converting mechanism from shaft rotation to shaft advance / retreat is provided between the output shaft and the needle valve. Further, a structure in which the air stepping motor and the control unit are connected by a flexible air hose "is featured.

[0007]

In the above liquid flow rate adjusting valve of the present invention, the needle valve for adjusting the flow rate of the liquid is connected to the air stepping motor having the above construction, and the rotation of the air stepping motor is moved forward and backward by the operation conversion mechanism. It is converted and transmitted to the needle valve. In the air stepping motor, when the notch blade ring is provided around the notch blade ring at a gradual pitch such as 72 circumferences, the notch blade ring accurately performs gradual angular rotation according to the pitch of the notch blade. Therefore, the forward / backward movement of the needle valve becomes extremely precise and accurate, and the flow rate of the liquid by the needle valve can be adjusted extremely precisely and accurately and quickly.

Since the air stepping motor, which is the operation source of the needle valve, is connected to the isolated control section by the flexible air hose, the air hose is a long hose of 25 meters or the like and is close to zero. A small bending radius can be adopted, and the freedom of disposing the flow rate adjusting valve in a factory or the like is significantly improved as compared with the conventional one. Further, in the flow rate adjusting valve of the present invention, the operation converting mechanism for converting the rotation of the shaft into forward and backward may be extremely simple, and there is no complicated rotating body in the main part of the air stepping motor. Therefore, it can be made smaller and lighter than conventional products, and the mechanical accuracy for accurate flow rate adjustment performance is stable for a long period of time.

[0009]

Embodiments will be described in detail below based on embodiments. Referring to FIG. 1 showing an embodiment of the present invention applied to paint adjustment of a mass-production painting apparatus for automobile bodies, a flow rate adjustment for adjusting a flow rate of paint flowing out from an inlet 13 to an outlet 14 by advancing and retracting a needle valve 1 is performed. In the valve, the valve shaft 3 of the needle valve 1 is linearly connected to a rotary output shaft 4 of an air stepping motor 2 which will be described later, and between the output shaft 4 and the valve shaft 3, a threaded portion on the valve frame 5 side is provided. 6 is provided with an operation converting mechanism of a shaft body formed of a male screw type coupling 7 that meshes with the shaft 6. When the rotational operation of the output shaft 4 is transmitted to the coupling 7, the rotation causes the coupling 7 that meshes with the threaded portion 6 to act as a valve shaft. 3 moves forward and backward in the axial direction of the needle valve 3, and this forward and backward movement is transmitted to the valve shaft 3 so that
Has a structure that moves forward and backward.

In the air stepping motor 2 which is the operation source of the needle valve 1, a notch blade ring 10 having a V-shaped notch blade 8 engraved on the outer periphery of the circumference 72 equally divided is provided on the output shaft 4. The operation blade 9 is directly connected to the notch blade 8 of the notch blade ring 10, and the three operation blade portions 11 ((A) in FIG. (Only one is shown by a dotted line). Each of the operating blades 9A, 9B, and 9C of the operating blade portion 11 has a V-shaped tip as shown in FIG. 1C, and has a shape forcibly engaging with the opposing notch blade 8 in the forward movement position. , These three operating blades 1
The working blades 9A, 9B, 9C of No. 1 have different displacements E which are slightly different from the reference point of the notch blade 8, and this working blade group sequentially moves to the notch blade 8 in the order of 9A, 9B, 9C. Alternately, when one-cycle meshing is performed as shown in the drawing, the notch blade ring 10 is rotated by a small step angle in the direction of arrow A in the figure, to the one pitch of the notch blade 8. Further, when the operating blade groups are alternately replaced in the order of 9C, 9B, 9A, which is the reverse of the above, and one-cycle engagement is performed, the notch blade ring 10 causes the notch blade 8 to move.
The structure has a structure in which a small pitch angle is rotated in the direction opposite to the arrow A in the figure.

In the air stepping motor 2 described above, the control section which is provided separately and the flexible air hose 12 are connected, and the electric signal pulse of the control section is used to send air to the air hose 12 for the above-mentioned purpose. Working Blade 9A / 9B
・ Sequential operation of 9C is controlled. Then, the notch blade ring 10 is angularly rotated by the required direction and the required number of times in the required direction and the required number of consecutive operations of the operating blade group by the electric signal pulse, and the needle valve 1 is moved forward and backward based on the rotation direction and the rotation amount. The flow rate of paint from the delivery port 14 can be freely adjusted.

The above-mentioned embodiment can be expected to have the above-mentioned effects. That is, since the notch blade ring 10 has the notch blade 8 divided into 72 equal parts on the outer circumference, it makes a small step angle motion by the operation of the operating blades 9A to 9C, and the needle valve 1 directly connected to the output shaft 4 can be finely adjusted. It is possible to perform a precise advance / retreat operation and precisely control the paint delivery amount that accurately matches the control program input to the control unit in advance. The delivery amount control is achieved by a simple structure having the air stepping motor 2 as a main part, and the control unit and the flow rate adjusting valve are connected by a flexible air hose, so that the flow rate adjusting valve in the factory can be controlled. The degree of freedom in arrangement is high, and the mechanical accuracy for maintaining the flow rate adjustment accuracy is stable for a long time.

[0013]

As described above, the liquid flow rate adjusting valve of the present invention has an excellent adjusting performance capable of accurately and quickly adjusting the liquid flow rate, and connects the flow rate adjusting valve remote from the control unit. Since the air hose is long and a very small bending radius can be adopted, it has good layout performance in the factory. Moreover, it has a simple structure and few rotation mechanisms that cause friction, so the entire valve is small and lightweight. It has excellent mechanical accuracy stability and can be used very usefully for adjusting the paint flow rate of mass-production painting equipment in factories.

[Brief description of drawings]

FIG. 1 shows a liquid flow rate adjusting valve according to an embodiment of the present invention, in which (A) is a front view thereof, (B) is a side view thereof, and (C) is air stepping thereof. Illustration of motor operation

[Explanation of symbols]

 1 Needle Valve 2 Air Stepping Motor 3 Valve Shaft 5 Valve Frame 6 Screw Part 7 Coupling 8 Notch Blade 9 ・ 9A ・ 9B ・ 9C Operating Blade 10 Notch Blade Ring 11 Operating Blade 12 Air Hose 13 Inlet 14 Outlet

Claims (1)

[Scope of utility model registration request] 1. A main part is provided with a needle valve that can move forward and backward,
In a flow rate adjusting valve for adjusting a flow rate of a liquid by the needle valve, a notch blade ring having a notch blade annularly provided, and a plurality of operating blades that are movable forward and backward and individually engage with the notch blade at a forward position, A rotary output shaft of an air stepping motor for angularly rotating the notch blade ring and the needle valve are connected in a straight shape by sequentially engaging the operating blade with the notch blade, and the output shaft and the needle valve are connected to each other. A flow rate adjusting valve for a liquid, which is characterized in that an operation converting mechanism from rotation of a shaft to advance / retreat of a shaft is provided, and the air stepping motor and a control unit are connected by a flexible air hose.