JPH0330869A - Apparatus for supplying coating agent - Google Patents

Abstract

PURPOSE:To simplify and miniaturize a coating agent supply apparatus and to reduce the length of the air piping connected between a signaling air supply valve and an air control circuit by interposing the signaling air supply valve opened and closed in connection with the clock motion of the cylindrical piston externally fitted to the outside of a cylinder in a freely slidable manner between both pumps. CONSTITUTION:A pair of double-acting reciprocating pumps 2A, 2B are arranged in opposed relationship so as to oppose the respective leading ends of cylinders 16A, 16B having piston rods 7A, 7B received therein to each other. Further, signaling air supply valves 18a-18c opened and closed in connection with the operation of the piston rods 7A, 7B are interposed between both pumps 2A, 2B. By this constitution, the whole of a coating agent supply apparatus can be integrated extremely compactly and the air pipings connected between said valves 18a-18c and an air control circuit can be made extremely short.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a coating agent supply device that continuously supplies a fixed amount of coating agent to a coating machine using a pair of double-acting reciprocating pumps.

[Conventional technology]

This type of coating agent supply device connects a pair of double-acting reciprocating pumps in parallel to the applicator, in which the pressure of the coating agent and the working fluid that presses out the coating agent alternately acts on both sides of the piston. The coating agent supplied to the pump is alternately pumped out without interruption at a flow rate corresponding to the amount of working fluid supplied, and is continuously supplied in a fixed amount to the coating machine (Japanese Patent Laid-Open No. 63-1
11962, 63-111967, 64-6
3064).

FIG. 5 is a flow sheet diagram showing the conventional example,
On/off valve vI for coating machine 1.

double-acting reciprocating pump 2A connected in parallel via V2,
2B are connected to the coating agent supply source 3 via on/off valves V, , V4, respectively, and the on/off valves v, V4.
, V, to the working fluid supply source 4, and each of these valves V, -V is opened and closed at a predetermined timing by control air output from the air control circuit 5, and both pumps 2A.

The coating agent supplied to one side of the piston 6 consisting of a diaphragm 2B is forced out by the working fluid supplied to the opposite side, and the amount of coating agent discharged from both pumps 2A and 2B to the applicator 1 is increased. The corresponding amount of coating agent is alternately supplied without interruption.

Here, the on-off valve ■1゜■2 that supplies the coating material squeezed out from each pump 2A, 2B to the coating machine 1 is the on-off valve V that supplies the working fluid to each pump 2A, 2B.
,,V, are opened and closed at the same timing.

Further, the on/off valves V, , V, which supply the coating agent to each pump 2A, 2B are each pump 2A.

The working fluid supplied to 2B is discharged to the working fluid supply source 4.
The on/off valves V'r and Vs are opened and closed at the same timing.

The air control circuit 5 that controls the opening and closing of these valves 1 to VB includes piston valves 8A and 8B that are switched in conjunction with the operation of the piston door A and 7B to which the piston 6 of each pump 2A and 2B is attached. Four types of air signals are inputted from the compressed air supply sources 9A and 9B through the compressed air supply source 9A and 9B.

In other words, the signal air supply valve 8 consisting of a piston valve
The four types of air signals output from A and 8B are input to the AND gate 10A10B of the air control circuit 5,
This anime) 10A.

On-delay timer I with air signal output from 10B
IA, IIB are activated, and each pump 2A.

After a predetermined period of time (for example, 0.4 seconds) after the application agent is completely squeezed out from the compressed air supply sources 12A and 1
Control air is output from 2B via the timers IIA and IIB to alternately open and close the on/off valves V, , V, and V4°, respectively, at predetermined timings.

Further, when an air signal is output from the AND gates IOA and IOB, the piston valve 13 is switched by the air signal, and the off-delay timer 14A is activated by the air signal output from the valve 13.

14B is activated, and control air is output from the compressed air supply sources 15A and 15B via the timers 14A and 14B to alternately open and close the on/off valves V, , V, and V, , V, respectively, at predetermined timing. be done.

Each pump 2A is controlled by these four types of control air.

The coating agent is alternately supplied from 2B to the coating machine 1 without interruption, and 1. The timers 14A and 14B cause the other pump to start pushing out the coating agent just before one pump finishes pumping out the coating agent, and when both pumps are switched, the coating agent supplied to the applicator 1 is controlled by the timers 14A and 14B. This prevents pulsation from occurring in the agent.

[Problem to be solved by the invention]

However, in such a conventional device, each pump 2A.

2B are provided separately apart from each other, signal air supply valves 8A and 8B made of piston valves are provided near each, and long air piping is provided between each of these valves 8A and 8B and the air control circuit 5. Since the devices are connected, the entire device becomes large and takes up installation space, and there are problems in that it cannot be installed directly near the applicator 1 or integrated with the applicator 1, and the piping work is also complicated. There was a problem that this could lead to piping errors.

Therefore, in the present invention, the pumps 2A and 2B are placed as close as possible to each other, and a signal air supply valve is compactly interposed between the two pumps and 2B, thereby reducing the size of the entire device. The technical challenge is to eliminate the need for long air piping.

[Means to solve the problem]

In order to solve this problem, the present invention provides a pair of double-acting reciprocating pumps in which the pressure of the coating agent and the working fluid that presses it out alternately acts on both sides of the piston, and the pressure of the coating agent and the working fluid that presses out the coating agent alternately acts on both sides of the piston. Four types of air signals are output from the signal air supply valve, which opens and closes in conjunction with the operation of the piston wood of each pump, so that the coating agent is squeezed out, and the coating agent and working fluid are supplied to each pump, respectively. In the coating agent supply device for controlling the timing of the application, the two pumps are disposed facing each other with the tips of cylinders containing the respective piston rods facing each other, and each piston rod is provided with a magnet in its shaft portion, A cylindrical piston made of a ring-shaped magnet that clicks in a direction opposite to the movement direction of each piston rod due to the attractive and repulsive force generated between the cylinder and the magnet is slidably fitted on the outside of each cylinder. A signal air supply valve, which is opened and closed in conjunction with the click movement of each cylindrical piston, is interposed between the two pumps.

[Effect]

According to the present invention, a pair of double-acting reciprocating pumps are disposed facing each other with the tips of the cylinders containing the respective piston woods facing each other, and are used for signal purposes that are opened and closed in conjunction with the movement of the piston rods. Since the air supply valve is interposed between both pumps, the entire device can be integrated very compactly, and the air piping etc. connected between the signal air supply valve and the air control circuit can also be integrated. Can be made very short.

In particular, the cylindrical piston that opens and closes the signal air supply valve is slidably fitted on the outside of the cylinder that accommodates each piston rod of both pumps, and clicks quickly due to the attractive and repulsive force of the magnet. Since the signal air supply valve can be opened and closed over a short movement distance, the distance between the two pumps can be narrowed so that the tips of the cylinders housing the piston rods approach each other without any gaps, making it possible to minimize the overall size of the device. can.

Furthermore, if the signal air supply valve is opened and closed using a cylindrical piston that clicks due to the attraction and repulsion force of a magnet, the switching of the valve will be much sharper compared to a toggle arm that clicks due to the force of a spring.

〔Example〕

Embodiments of the present invention will be specifically described below with reference to the drawings.

FIG. 1 is a cross-sectional view showing an example of a coating agent supply device according to the present invention, and FIG. 2 is an enlarged cross-sectional view of a cylindrical piston forming the main part thereof.

Note that parts common to those in FIG. 5 are designated by the same reference numerals, and detailed description thereof will be omitted.

In this example, a pair of double-acting reciprocating pumps 2A and 2B are connected to cylinders 16A that house piston rods 7A and 7B, respectively.
, 16B are arranged facing each other with their tips facing each other, and each piston wood 7A, 7B has two ring-shaped magnets m, , mz arranged in parallel on its shaft, and each cylinder 1eA, 16B
The cylindrical pistons 17A, 17B are made of ring-shaped magnets M+, Mz that click in a direction opposite to the direction of movement of each piston Rondoor A, 7B due to the attractive and repulsive force generated between them and the magnets m, , mz. are externally fitted, and three signal air supply valves 113a -
18C is interposed between both pumps 2A and 2B.

Each pump 2A, 2B has on/off valves Vr, V3, Vs, Vy shown in FIG. 5, and ■2V4. V
,,V,.

The magnets m, , mz of each piston rod 7A, 7B are adjacent to each other via a ring-shaped yoke 19, and as shown in FIG. They are arranged in combinations of poles.

On the other hand, the ring-shaped magnets M, M, forming the cylindrical pistons 17A, 17B are also adjacent to each other via the yoke 20, and the respective thicknesses are the same as those of the ring-shaped magnets m, M, of the piston rods 7A, 7B.
, m, and the magnet It,
They are arranged in a combination of N-3 poles and N-3 poles having the same polarity as rrLz.

As a result, each piston door A, 7B moves in the direction of pushing out the coating agent, and the magnets m, , m provided on the shaft portion thereof move.
If z deviates even slightly in the direction of extrusion of the coating agent from the position where it overlaps with the magnets Mt, Mt of the cylindrical pistons 17A, 17B fitted on the outside of each cylinder 16A, 16B,
At that moment, magnets Mr, Mt and magnet m 1 r m
Due to the suction and repulsion force of z, each cylindrical piston 17A, 17B quickly clicks in the opposite direction to the direction in which the coating agent is pushed out.

In addition, after each piston door A, 7B finishes pushing out the coating agent, it moves in the direction of discharging the working fluid, and the magnet ml
When ,m, shifts even slightly in the direction of discharging the working fluid from the position where it overlaps with magnets M, ,M, at that moment, the attractive and repulsive forces of magnets M+, Mz and magnets m, ,m The cylindrical pistons 17A, 17B quickly click in a direction opposite to the direction in which the working fluid is discharged.

Next, the cylindrical piston 17A makes a click movement in synchronization with the reciprocating movement of the pumps 2A and 2B.

Signal air supply valve 18 that opens and closes in conjunction with 17B
The valve bodies a to 18c are provided in valve bodies 23, 24 and 25 that are slidably attached to shaft-shaped valve seats 21 and 22 that integrally connect the pumps 2A and 2B.

Here, the valve seats 21, 22 are the cylinders 16A that accommodate the respective piston rods 7A, 7B.

They are arranged in parallel on both sides of 16B.

One valve seat 21 has two valve bodies 23 that engage with the respective cylindrical pistons 17A and 17B.
and 24 are provided separately on the cylindrical piston 17A side and the 17B side.

The valve bodies 23 and 24 are connected to each piston door A and 7.
B moves in the direction of pushing out the coating material, and each pump 2A, 2
Immediately before or when the extrusion of the coating material from B is completed, each cylindrical piston 17A.

Each signal air supply valve 18a, 18 is clicked integrally with 17B in a direction opposite to the direction in which the coating agent is pushed out.
b is an air signal output path 26 bored in the valve seat 21.
．． 27 respectively.

Further, the other valve seat 22 has a cylindrical piston 17.
A valve body 25 is provided between A and 17B and is alternately pressed and moved by both pistons.

When one of the cylindrical pistons clicks in the direction of extruding the coating material, the valve body 25 is pressed by the other piston and collides with the other cylindrical piston that clicks in the direction of discharging the working fluid. and the signal air supply valve 18c is moved to the valve seat 22 at the blocked position.
The left and right air signal output paths 28 and 29 are alternately connected to each other.

As a result, four types of air signals are output for controlling the timing for alternately supplying the coating agent from the coating agent supply source to each pump 2A, 2B and the timing for alternately squeezing out the supplied coating agent.

Furthermore, since the signal air supply valves 18a to 18c are interposed between the pair of pumps 2A and 2B, which are disposed so that the tips of the piston rods 7A and 7B face each other, the entire device can be significantly miniaturized. At the same time, the air piping connected between the valves 18a to 18c and the air control circuit can also be very short.

Furthermore, the cylindrical pistons 17A and 17B that switch between the valves 18a to 18c take up no space at all compared to toggle arms that make click movements due to the action of springs, and even though they are small, they make quick click movements. Valve switching becomes very sharp.

Note that, as shown in FIG.
1.22 and the valve bodies 23, 24, and 25 are reversed, and the shaft-shaped valve bodies 40, 41 are provided with signal air supply valves 18a to 18c, and are provided with a cylindrical piston 17A.

Valve seat 42. clicks into engagement with valve seat 17B.
43 and 44 may be slidably attached.

Furthermore, if the distance between the pumps 2A and 2B does not need to be increased to some extent, the valve seats 42, 43 and 44 may be arranged in parallel on one valve body 40, as shown in FIG.
It is also possible to reduce the number of air pipes that supply signal air to 8a to 18c.

〔Effect of the invention〕

As described above, according to the present invention, the coating agent supply device of the type that alternately pumps out a fixed amount of coating agent from a pair of double-acting reciprocating pumps without interruption is significantly simplified and smaller than the conventional one.
This has a very valuable effect in that it can be installed right next to the coating machine or integrally with the coating machine.

In addition, the length of the air piping that takes out the air signal to control the timing of supplying the coating agent to each double-acting reciprocating pump and the timing of squeezing out the supplied coating agent has been shortened.
It also has the excellent effect of making the piping work easier and eliminating piping mistakes.

[Brief explanation of drawings]

FIG. 1 is a cross-sectional view showing an example of the coating agent supply device according to the present invention, FIG. 2 is an enlarged cross-sectional view of a cylindrical piston forming the main part, and FIGS. A sectional view showing another embodiment, and FIG. 5 is a flow sheet diagram showing a conventional device. Explanation of symbols 2A, 2B -- Double-acting reciprocating pump, 6 -- Zeston, 7A, 7B -- Piston rod, m, It -- Magnet, 16A, 16B -- Cylinder, 17A, 17B -- - Cylindrical piston, MI, Mz' - Magnet, 18a~18cm...Signal air supply valve.

Claims (1)

[Claims] The pressure of the coating agent and the working fluid that presses it out is applied to the piston (6
) A pair of double-acting reciprocating pumps (2
A) and (2B) are provided, and both pumps (2A) and (2B) are installed.
) of the piston rods (7A) of each pump (2A) and (2B) so that the coating agent is alternately squeezed out without interruption.
Four types of air signals are output from the signal air supply valve that opens and closes in conjunction with the operation of pump (7B).
In the coating agent supply device that controls the timing of supplying a coating agent and a working fluid to A) and (2B), respectively, both the pumps (2A) and (2B) are connected to each piston rod (7A).
), (7B) are accommodated in the cylinders (16A) and (16B).
) are arranged facing each other with their tips facing each other, and each piston rod (7A), (7B) has a magnet (m_1) on its shaft.
~m_2) are provided, and each cylinder (16A), (16
B), each piston rod (7A), (7B
); a cylindrical piston (17A) made of ring-shaped magnets (M_1 to M_2) that click in the opposite direction to the direction of movement;
(17B) is slidably fitted on the outside, and the signal air supply pulps (18a to 18c
) is interposed between the pumps (2A) and (2B).