JPS5946160A - Apparatus for preventing spitting of sprayer - Google Patents

Abstract

PURPOSE:To release accumulated pressure in a pressure sending hose to prevent spit at the beginning of spraying, by a method wherein a spray gun is closed and a pump is reversed after a flow switch is turned off. CONSTITUTION:When the spray work of a spray gun 1 is stopped and a flow switch 4 is turned off, the normally closed side of the flow switch 4 and CR1 are together turned on and a reversing magnet switch 6 is turned on to reverse a pump motor 2 and to set a timer 8. By this operation, residual pressure in an emitting hose is returned to usual pressure and spit can be prevented without injecting a large amount of a material at the next spraying time.

Description

[Detailed description of the invention] The invention is based on the spraying force/
This invention relates to a spit prevention device for a blowing machine that prevents the spitting that occurs at the beginning of blowing.

1] Usually, when using a squeeze pump or the like to pump materials for external construction (ricin, tiles, etc.) to a spray force, the operation of the pump is controlled remotely by operating the spray force. Generally, when spraying and stopping,
It is a remote method that takes advantage of the fact that one air flow blows one hole. However, in the conventional remote control method, when blowing is stopped, when the spray can is closed, the flow of air in blowing port 1 becomes accurate, so this is sensed and the pump motor is simply stopped using a flow switch. Ta. Therefore, after stopping the force, the flow switch can be turned on and off.
':I'Jay, there is a second II point,
Feed the spray can fC material from the pump.1. The pressure inside the pressure hose rose above the pressure during blowing 1.1 work. Therefore, at the start of the 9th blowing VC, the blowing is more than working day -j, and the wood in the armpits is discharged, causing the so-called spit phenomenon.7q
It had a defect that caused some non-uniformity and spoiled the aesthetic appearance.

The present invention is based on the actual situation described above, and blows f = 11 that does not cause spitting at the beginning of blowing of architectural-shaped 171 materials. 1', the spit protection (I-equipment; C') is provided 4 times.

That is, inventively, the spray can fzr was closed, the flow switch was turned off, and the bong was reversed. It is something to do.

Clothes, F2 Implement # of the present invention 41. - Explanation about the drawing in Figure 1. First, in the system diagram in Figure 1, the operation of the pressure pump 2 consisting of a squeeze type pump, a snake type, a squeeze type pump, etc. control (+14i (forward/reverse operation) f
It comprises control means 3. On this open side 1 means 3,
Connect to the AC power supply and connect R mountain, flow switch 41fc for reverse operation, forward rotation month 4, magnet switch 5 and reverse rotation magnet sinchiro, and connect relay 7 and timer 8, which will be a self-holding circuit, in parallel l/c Connect this end and change the direction of rotation, then connect it to the coil Ill, connect it with the )' wire, and it becomes 1+Ill. i,': i:< sζ/ノ2 is guided to the pump motor 2.

Here, the 9 effects are explained as follows:
1-Switch 4 VC air is tA
i, h, and 1 [diversion 1 mag funotosinoboo 5 power; enters one MSL enters, relay 7 is 1, l, jj lucky bonno motor 2 is made positive, sgrape no/l
Yori Itsu ``determined σ)、Kiwabuki (;] injury conduct i'1,
Ru.

Next, the blowing 1.1 of the soufflé can: 'l meeting i','
-+1. L.

Flow switch 4 is off i1. Then, the filter ``J-switch 4/--7A--s(fil, '-'N
, 1fc()N are turned on, the reversing magnet switch 6 is turned on, and the reversing motor 2' is reversed. Then, timer 8 becomes 0.
1"]", the magnet switch 6 for the above-mentioned reverse rotation
is turned off, and the pump motor 2 stops rotating in reverse. This reversal time depends on the material used and the type of discharge hose.

It varies depending on the length, etc., but it is preferable that Uratsune is about 5 seconds long! It became clear from 罎vC.

Now, if we take the normal blowing N pressure (feeding force) as Pm, and consider the ratio to the maximum pressure (in this case, the start of blowing + dr, the pressure remaining in the hose) as the pressure fluctuation ratio, As shown in the graph of 1, it can be seen that as the reversal time becomes longer, the fluctuation ratio decreases, and the stability of the first-order blowing becomes more stable.

However, if the reversal time is too long, there will be an extreme shortage of interest in the hose, which will lengthen the recovery time until stable spraying can be achieved.

The reversal time is preferably around 3 to 5 seconds, and the pressure fluctuation ratio is halved, so that a large amount of material can be sprayed out at once to form a beautiful coating without damaging the coating surface.

This invention was made by using VC to reverse the pump motor for a certain period of time after the suzure can is closed and the flow switch is turned off.

The pressure remaining in the discharge hose can be returned to normal pressure by reversing the discharge hose, and at the time of the fifth blow, the material does not spout out and spitting can be prevented.

In other words, the %, pressure/blowing [1 average pressure at the time of stopping can be reduced by about half, and therefore the 11% of the material t1 at the time of the 9th blowing stroke is uniform, resulting in a beautiful painted surface. , '1- can be done.

[Brief explanation of drawings]

Figure 1 shows the embodiment of the present invention, Figure 1 is the system diagram, Figure 2 is the circuit diagram, and Figure 3 shows the performance. ...Pressure pump 2...B/F motor 3...Control n [
11 means 4...Sochi J-7, (Sochi 5.
・Forward rotation 111 Magui Noto Suinoji 6...Reverse rotation 1 Madanen I-Switch 7...Relay 8
...Timer patent applicant Iwa Fl-jqW machine-■
, Ministry 44;
Kagaya 1st year - 揄'JHata゛tsube 3-tails)' Agent BuV :l'! l! l: -L',
11 Meiji・'1、゛・□
. V,~゛41゛'' Figure 1 Figure 3

Claims (1)

[Claims] 1. The spray material pressure pump supplies the R-filtrate to the spray can, and the spray can is controlled by an air-operated flow switch that controls the operation of the pressure pump.
4fi% /7) Spit prevention] 1 device, characterized in that the pressure feeding bomb is reversed for a certain period of time at the same time as one spray can is stopped in one machine.