JPH0576806A - Controlling device for discharge flow rate of flow gun - Google Patents

Abstract

PURPOSE:To prevent the increase in a phenomenon of discharge quantity when the discharge is started, particularly the coating work of high viscosity liquid by means of a flow gun. CONSTITUTION:A discharge flow rate control device consists of a pump 4 for compressively transferring high viscosity liquid 3 stored in a tank 2, a compressive transfer passage 5 for guiding the liquid 3 compressively transferred from the pump 4, a flow gun 1 provided with a feeding control valve 6 adjusting the discharge flow rate of the liquid 3 and a nozzle 7, a solenoid valve 9 installed in a compressive transfer passage 5 between a discharge valve 8 provided in the outlet of the pump 4 and the feed control valve 6 and a control section 10 for making the feed control valve 6 open and then the solenoid valve 9 open.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a discharge rate control device for a flow gun, which controls a discharge rate of a flow gun for coating a high viscosity liquid.

[0002]

2. Description of the Related Art Conventionally, a flow gun for applying a high-viscosity liquid such as a sealant or an adhesive has been disclosed in Japanese Utility Model Publication 63-6617
As described in Japanese Patent Publication No. 2, a drive for driving a needle valve (valve movable portion) that is biased in a valve closing direction in association with a trigger of a hand-held flow gun in a valve opening direction against the biasing force thereof. When the trigger is operated at a constant speed by dividing the member into the first and second driving members, the first driving member, which has a small movement amount, drives the needle valve in the valve opening direction due to its initial movement. After the initial valve opening speed is reduced and the initial flow rate that attempts to flow out in large quantities due to high pressure is reduced and the pressure is decreased, the second drive member, which has a large movement amount, drives the needle valve in the same direction to open valve opening speed. It is known that the temperature is raised to ensure a constant flow rate.

[0003]

Conventionally, immediately after the needle valve of a flow gun is opened, the liquid is pumped at a high pressure, so a large amount of liquid is discharged from the nozzle and the first coating part rises like a dumpling. To a predetermined thickness. Therefore, there is a problem in that an extra portion of the initial application portion must be removed manually after application.

Further, in order to avoid such a phenomenon, according to the prior art, by operating the trigger at a constant speed, the opening speed of the needle valve is changed in two steps, which causes the valve opening. The amount of discharge is adjusted to be constant, but it requires the skill of the operator and it is extremely difficult to secure a constant flow rate from beginning to end, and the hose is under high pressure. There was a problem that the trigger of the flow gun became hard and the workability was poor. The present invention has been made in view of the above problems of the conventional technique, and an object of the present invention is to control a discharge flow rate of a flow gun capable of preventing an increase phenomenon of a discharge amount at the start of discharge. It is intended to provide a device.

[0005]

In order to solve the above problems, the present invention provides a pump for pumping a liquid, a pumping passage for guiding the liquid pumped from the pump, and a supply control valve for adjusting the discharge flow rate of the liquid. In a flow gun discharge flow rate control device including a flow gun including: a solenoid valve for opening and closing the pumping passage that connects the pump and the flow gun, and a control for operating the solenoid valve after the supply control valve is activated. Parts are provided.

A pump for pumping the liquid, a pumping passage for guiding the liquid pumped from the pump, and a hand-held flow gun provided with a supply control valve for adjusting the discharge flow rate of the liquid in conjunction with a trigger operation. A flow rate control device for a flow gun, comprising: an electromagnetic valve that opens and closes the pressure feed passage that connects the pump and the handheld flow gun; and a switch that activates the electromagnetic valve after the supply control valve operates. You can also Further, the switch may be provided in the vicinity of the trigger so as to operate the electromagnetic valve after the supply control valve is operated by operating the trigger.

[0007]

First, only the supply control valve of the flow gun is opened, the liquid is discharged by utilizing the residual pressure stored in the pressure feeding passage between the supply control valve and the solenoid valve, and then the solenoid valve is also opened. Since the liquid is discharged in a stable state of high pressure, the rising portion is not formed and the liquid is applied with a constant thickness.

[0008]

Embodiments of the present invention will be described below with reference to the accompanying drawings. 1 is a configuration explanatory view of a discharge flow rate control device for a flow gun according to claim 1, FIG. 2 is a configuration explanatory diagram of a discharge flow rate control device for a flow gun according to claim 2, and FIG. 3 is a discharge flow rate for a flow gun according to claim 2. FIG. 4 is a side view of a hand-held flow gun of the control device according to another embodiment.

The discharge flow rate control device of the flow gun shown in FIG. 1 is a case where the flow gun 1 is mounted on an automatic machine such as an industrial robot to apply a high viscosity liquid, and the high viscosity liquid stored in a tank 2 is applied. 3, a pump 4 for pumping the liquid 3, a pumping passage 5 for guiding the liquid 3 pumped from the pump 4, a flow gun 1 having a supply control valve 6 and a nozzle 7 for adjusting the discharge flow rate of the liquid 3, and an outlet of the pump 4. Solenoid valve 9 provided in the pressure passage 5 between the discharge valve 8 and the supply control valve 6
And a control unit 10 that opens the supply control valve 6 and then opens the solenoid valve 9. The supply control valve 6 may be driven by electricity or air.

With this configuration, in the work of repeatedly applying the liquid 3 to a predetermined portion with a predetermined thickness while moving the flow gun 1 with a certain tact, the liquid 3 is first ejected from the nozzle 7 of the flow gun 1. In doing so, first, the supply control valve 6 of the flow gun 1 is opened. At this time, the solenoid valve 9 is closed. Therefore, since the liquid 3 is discharged from the nozzle 7 by the residual pressure remaining in the pressure feeding passage 5 connecting the solenoid valve 9 and the supply control valve 6 by the previous coating work, the high pressure liquid 3 pumped from the pump 4 directly Since the liquid is not discharged from the nozzle 7, the liquid 3 is smoothly applied without the application portion rising like a dumpling.

After that, the timing provided in the controller 10 estimates the timing when the residual pressure remaining in the pressure-feeding passage 5 decreases and the liquid 3 is no longer discharged from the nozzle 7 with a predetermined thickness. Open it. Then, the liquid 3 discharged by the residual pressure remaining in the pressure supply passage 5 is discharged from the nozzle 7 with a predetermined thickness, following the liquid 3 discharged under pressure from the pump 4 in a stable state. Therefore, the discharge flow rate of the liquid 3 can be controlled to a predetermined amount from the start of discharge of the coating operation of the liquid 3 to the end of discharge.

At the end of the discharge, the control unit 1 controls the solenoid valve 9 to be closed after the supply control valve 6 is closed.
The residual pressure remains in the pressure feeding passage 5 that connects the solenoid valve 9 and the supply control valve 6 by controlling 0 to prepare for the next coating operation.

The discharge flow rate control device of the flow gun shown in FIG. 2 is a case where an operator grips the hand-held flow gun 11 and applies a high-viscosity liquid, and the high-viscosity liquid 3 stored in the tank 2 is pressure-fed. Pump 4, a pumping passage 5 for guiding the liquid 3 pumped from the pump 4, and a supply control valve 13 for adjusting the discharge flow rate of the liquid 3 in conjunction with the operation of the trigger 12.
A hand-held flow gun 11 equipped with a nozzle 7 and a pump 4
The solenoid valve 9 is provided in the pumping passage 5 between the discharge valve 8 and the supply control valve 13 provided at the outlet of the valve, and the switch 14 is provided near the trigger 12 that opens the solenoid valve 9. ing.

With this configuration, the nozzle 7 of the hand-held flow gun 11 is used in a work in which the operator repeatedly applies the liquid 3 to a predetermined portion with a predetermined thickness while moving the hand-held flow gun 11 with a certain tact. First, when the liquid 3 is first discharged, if the trigger 12 of the hand-held flow gun 11 is operated, the supply control valve 13 is opened in association with the operation of the trigger 12. At this time, the switch 14 is off and the solenoid valve 9 is closed. Therefore, since the liquid 3 is discharged from the nozzle 7 by the residual pressure remaining in the pressure feeding passage 5 connecting the solenoid valve 9 and the supply control valve 13 by the previous application work, the high pressure liquid 3 pumped from the pump 4 directly. Since the liquid is not discharged from the nozzle 7, the liquid 3 is smoothly applied without the application portion rising like a dumpling.

After that, when the residual pressure remaining in the pressure-feeding passage 5 is reduced and the liquid 3 is no longer discharged from the nozzle 7 with a predetermined thickness, the operator holds the trigger 1 of the hand-held flow gun 11.
2 presses the switch 14 shown in FIG. 3 or 4 to turn on the switch 14 and open the solenoid valve 9. Then, the liquid 3 discharged by the residual pressure remaining in the pressure supply passage 5 is discharged from the nozzle 7 with a predetermined thickness, following the liquid 3 discharged under pressure from the pump 4 in a stable state. Therefore, it is possible to control the discharge flow rate of the liquid 3 to a predetermined amount by operating the trigger 12 from the start of discharge of the coating operation of the liquid 3 to the end of discharge.

FIG. 3 shows a flow rate control device for the flow gun shown in FIG. 2, in which the solenoid valve 9 does not directly open and close the pressure feeding passage 5 between the discharge valve 8 and the supply control valve 13, but the solenoid valve 9 supplies air. The switching valve 15 is switched to drive the opening / closing valve 15 for opening / closing the pressure feeding passage 5. Therefore, the supply control valve 1 built in the open / close valve 15 and the hand-held flow gun 11 by the previous application work.
Since the liquid 3 is discharged from the nozzle 7 due to the residual pressure remaining in the pressure supply passage 5 connecting the three, the high-pressure liquid 3 pumped from the pump 4 does not directly discharge from the nozzle 7, so that the coating portion rises like a dumpling. Liquid 3 is applied smoothly without.

[0017]

As described above, according to the present invention, it is possible to control the discharge flow rate of the liquid to a predetermined amount in the liquid application work from the start of the discharge of the liquid to the end of the discharge. Further, since the coating work is performed using the residual pressure at the start of discharge, the pressure in the pressure feeding passage connected to the hand-held flow gun is not high, so that the trigger is easily pulled and the workability is improved.

[Brief description of drawings]

FIG. 1 is a structural explanatory view of a discharge flow rate control device for a flow gun according to claim 1.

FIG. 2 is a structural explanatory view of a discharge flow rate control device for a flow gun according to claim 2;

FIG. 3 is a configuration diagram of another embodiment of the discharge flow rate control device of the flow gun according to claim 2;

FIG. 4 is a side view of a handheld flow gun.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Flow gun, 3 ... Liquid, 4 ... Pump, 5 ... Pumping passage, 6, 13 ... Supply control valve, 9 ... Electromagnetic valve, 10 ... Control part, 11 ... Handheld flow gun, 12 ... Trigger, 14 ... Switch, 15 ... Open / close valve.

Claims (3)

[Claims] 1. A discharge flow rate control device for a flow gun comprising a pump for pressure-feeding a liquid, a pressure-feed passage for guiding the liquid pressure-fed from the pump, and a flow gun having a supply control valve for adjusting the discharge flow rate of the liquid. A flow rate control of a flow gun, wherein an electromagnetic valve for opening and closing the pressure feeding passage connecting the pump and the flow gun is provided, and a control unit for activating the electromagnetic valve after the supply control valve is activated. apparatus. 2. A hand-held flow gun equipped with a pump for pumping liquid, a pumping passage for guiding the liquid pumped from the pump, and a supply control valve for adjusting the discharge flow rate of the liquid in association with a trigger operation. In a discharge flow rate control device for a flow gun, a solenoid valve for opening and closing the pressure feeding passage connecting the pump and the handheld flow gun is provided, and a switch for activating the solenoid valve after the supply control valve is activated is provided. A discharge flow rate control device for a flow gun. 3. The discharge flow control device for a flow gun according to claim 2, wherein the switch is provided in the vicinity of the trigger so as to activate the electromagnetic valve after the supply control valve is activated by the operation of the trigger.