JP3506184B2 - Pressure regulator in coating equipment - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pressure adjusting device provided in a paint supply path. 2. Description of the Related Art Usually, a regulator as shown in FIG. 2 is provided in a paint supply path of a coating apparatus in order to suppress pulsation of a plunger pump. In this regulator, a valve seat c is provided between a paint inlet a and a paint outlet b communicating with a coating gun, and a hemispherical valve body f integral with a piston e in an air cylinder d is provided here. It is arranged so that it can come and go freely,
The paint is sent from the inlet a to the outlet b while the pressurized air having a pressure balanced with the pressure of the paint is sent from the pressurized air inlet g into the air cylinder d, and the supply of the paint pulsates. Is generated, the pressure is applied from the secondary pressure chamber h on the valve device side to the secondary pressure chamber i on the plunger side, and the difference in the receiving area between the valve body f and the support j thereof causes The valve f is closed to temporarily prevent the supply of the paint. However, in this type of regulator, the difference in the receiving pressure is usually set in the range of 1.5 to 3.0 kgf, so that, for example, a valve seat supply hole k of 2.9 mm cannot be moved from 9 to 9 kgf.
In order to prevent the paint which is fed at a pressure of 0 kg / cm ² with a 3.175 mm diameter hemispherical valve f, it is necessary to apply a high back pressure of 58.5 kg / cm ² to the valve seat. c and the hemispherical valve element f had a problem of being worn out in a short period of time. [0004] The present invention has been made in view of such a problem, and an object of the present invention is to have a simple structure and to be worn out even after long-term use. There is no new pressure regulating device. [0005] That is, the present invention provides a pressure adjusting device in a coating apparatus for achieving the above object, which is provided with a valve in a part of a supply flow path connecting an inlet and an outlet of the paint. A flow path component of a paint having a seat, a paint pressure pulsation detecting means that is displaced by receiving a pulsation of the paint supply pressure at a balanced position between a set supply pressure of the paint and a pressurized fluid supply pressure introduced from the introduction unit, A paint supply blocking means having a slidable valve which receives the introduced pressurized fluid supply pressure and is displaced to abut a valve seat to prevent paint supply, a pressurized fluid supply source and a paint supply inhibition means. A switching valve is provided in a part of the pressurized fluid supply flow path that connects to the pressure fluid supply path, and normally closes the supply flow path and operates to open the supply flow path with the displacement of the paint pressure pulsation detection means. And pressurized fluid supply control. An embodiment shown in the drawings will be described below. FIG. 1 shows an embodiment of the present invention for a pressure adjusting device attached to a coating apparatus. The main body 1 of the apparatus is roughly divided into a paint flow path forming section I, a paint pressure pulsation detecting means II, and a paint pressure pulsation detecting means II.
Pressurized fluid supply control means switched by II
And a paint supply blocking means IV for temporarily closing the paint flow path by the pressure of the pressurized fluid supplied at the time of pulsation. [0008] The paint flow path forming section I is composed of an inlet block 4 having an inlet 5 for paint, a valve seat block 9 having a valve seat 10 and an outlet block having an outlet for paint. These are integrally connected by bolts 3. An inflow port 5 opened to the side of the inflow port block 4 communicates with a flow path 11 of the valve seat 10 through a valve chamber 6 facing the valve seat 10. The outlet 14 provided in the opening communicates with the flow path 11 of the valve seat 10 via a valve chamber 15 facing the valve seat 10 so that the paint supplied from the inlet 5 is supplied to a coating gun (not shown). Is configured. On the other hand, the paint pressure pulsation detecting means II comprises a cylinder block 20 which is integrally fixed to the outlet block 13 with bolts 19, a pressurized air flowing through an air introduction hole 21 and a pressure of the paint. And a pulsation detection plunger 23 extending above the piston 22 while maintaining balance with the piston 22.
The pressure rod 25 is configured to receive the pressure of the paint by making its top surface 24 face the interior of the valve chamber 15 through the interior of the valve 6, and a pressing rod 25 extending below the piston 21 is in contact with a rod 32 of a switching valve 30 described later. The switching valve 30 is configured to be switched in contact therewith. On the other hand, the pressurized fluid supply control means III comprises a switching block 2 connected to the lower end of the cylinder block 20.
7, a pressurized fluid supply passage 29 for sending air from a pressurized air supply source 28 to a paint supply inhibiting means IV described later is formed. Two-position switching valve 30 for opening and closing 29
Are arranged so as to be always urged by the coil spring 31 to close the supply path 29 and to be switched to the open position by the pressing rod 25 of the piston 21 via the switching rod 32. . On the other hand, the paint supply blocking means IV comprises a cylinder block 35 and an operating piston 39 slidably mounted in the cylinder block 35 to cut off the supply of paint by pressurized air. 4 and is integrally attached to the upper end of the flow path component I with a bolt 34 provided therebetween. The cylinder block 34 is provided with an introduction hole 37 for introducing pressurized air from the pressurized fluid supply control means III in a cover 36 covering the top, and a working piston 39 which slides inside. Is at the tip of the rod 40,
A spherical valve 41 that comes into contact with the valve seat 10 and cuts off the supply of the paint is integrally formed. Next, a description will be given of an operation of supplying the paint by the apparatus having the above-described configuration. FIG. 1 shows a pressure adjusting device in a state in which a pulsation is detected and a paint supply flow path is integrally closed.
2 is pushed up to a position where it is balanced with the paint pressure by the pressurized air flowing into the cylinder block 20, and accordingly, the switching valve 30 is pushed up by the urging force of the coil spring 31 to supply the pressurized air. The supply of the pressurized air to the paint supply inhibiting means IV is cut off by closing the flow path 29. In this state, when the paint flows into the valve chamber 6 from the inflow port 5 with a pressure of, for example, 90 kg / cm ² , the paint causes the pressure to act on the spherical valve 41 to push it up. While opening the flow path 11 of the valve seat 10 to open the lower valve chamber 15
And is sent out from this through an outlet 14 to a coating gun (not shown). On the other hand, when a pressure greater than a predetermined supply pressure is applied to the paint as pulsation under this condition, the pressure of the paint acting on the top surface 24 of the pulsation detecting plunger 23 is increased by the pressure acting on the piston surface. Since the pressure exceeds the air pressure, the piston 22 is displaced downward while pressing down the switching valve 30 against the coil spring 31 to open the supply path 29 of the pressurized air. Therefore, the pressurized air that has flowed into the cylinder block 35 of the paint supply inhibiting means IV through the supply path 29 overcomes the paint pressure acting on the spherical valve 41 and lowers the working piston 39, so that the spherical valve 41 is brought into contact with the valve seat 10 to temporarily close the paint supply flow path 11 to suppress transmission of this pulsation to the paint gun. As described above, according to the present invention, the pulsation of the paint supply pressure is detected while the set supply pressure of the paint and the pressurized fluid supply pressure are balanced, and the detection is accompanied by the detection. Since the pressurized fluid supply flow path is opened by the displacement and the pressurized fluid is introduced into the paint supply inhibiting means, the paint supply flow path is closed, so that the pulsation detection of the paint supply pressure and the prevention of the paint supply are performed. Can be carried separately by different means, and the apparatus can be operated stably for a long period of time without an excessive burden on a valve seat or the like generated at the time of a paint supply inhibiting operation. By using another pressurized fluid for pulsation detection and for stopping the supply of paint, the apparatus can be operated accurately.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a sectional view of an apparatus showing one embodiment of the present invention. FIGS. 2A and 2B are cross-sectional views showing an example of a conventional device. 4 Paint inlet 10 Valve seat 14 Paint outlet 22 Piston 23 Pulsation detection plunger 28 Pressurized air supply source 30 Switching valve 39 Operating piston 41 Spherical valve 30 Switching valve I Paint flow path component II Paint pressure pulsation detection means III Pressure fluid supply control means IV Paint supply prevention means

Claims (1)

(57) [Claims] (1) A paint flow path component having a valve seat at a part of a supply flow path connecting a paint inflow port and a paint outflow port, and a paint supply set pressure and A paint pressure pulsation detecting means which is displaced by receiving a pulsation of the paint supply pressure at a position balanced with the supply pressure of the pressurized fluid introduced from the introduction portion; and A paint supply inhibiting means having a slidable valve for displacing and preventing the supply of paint; and a part of a pressurized fluid supply channel connecting the pressurized fluid supply source and the paint supply inhibiting means. Pressurized fluid supply control comprising a switching valve that normally closes the supply flow path and opens the supply flow path in accordance with the displacement of the paint pressure pulsation detection means. Pressure regulator.