JPH1015458A - Liquid coater - Google Patents

Abstract

PROBLEM TO BE SOLVED: To easily coat even a material difficult to bend with a liq. in a small space. SOLUTION: A mandrel A is linearly passed through the inside of a liq. vessel 1 by way of the passage holes 1a and moved in the longitudinal direction. In this case, a pump 3 is driven by a motor 4 to discharge a liq. B in the vessel 1 from a nozzle 2, the liq. B is deposited on the mandrel A traveling below the nozzle, and the liq. B not deposited on the mandrel A is again introduced into the vessel 1. The liq. B depositing on the surface of the mandrel A is removed by a scraper 5 leaving a specified amt. of the liq. B when the mandrel is passed through the hole 1a on the outlet side, and the mandrel is coated with a specified amt. of the liq. B and discharged from the vessel 1.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a liquid applying apparatus for applying a liquid to a surface of a mandrel serving as a core in the manufacture of a hose, for example.

[0002]

2. Description of the Related Art In general, in the manufacture of a hose, a rubber material, which is a raw material for a hose, is applied to the outer periphery of a mandrel coated with a liquid such as an adhesive or a solvent for forming an inner surface layer on the surface, and after vulcanization, the mandrel is manufactured. The hose is formed by extracting the hose. At this time, in order to apply the liquid to the surface of the mandrel, the mandrel is bent by a guide roller or the like as described in, for example, JP-A-55-144143, and the mandrel is placed in a liquid tank storing the liquid. The liquid is applied to the surface of the mandrel by guiding the bent portion and passing the mandrel through the liquid while moving the mandrel in the longitudinal direction.

[0003]

However, when a liquid is applied to a mandrel, it is difficult to bend a highly rigid one such as a mandrel having a large diameter to guide it into a liquid tank. In this case, if the mandrel is bent, the distance of the bent portion becomes longer, so that a longer liquid tank is required,
There is a problem that the coating equipment becomes large. Also,
It may not be possible to bend depending on the rigidity of the mandrel.

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and an object of the present invention is to provide a liquid coating apparatus capable of easily applying a liquid in a small space even for a coating object which is difficult to bend. It is to provide a device.

[0005]

In order to achieve the above object, according to the present invention, there is provided a liquid coating apparatus for applying a liquid to a long object to be applied, wherein the liquid to be applied to the object to be applied is provided. And a liquid container for passing the object to be applied linearly in the longitudinal direction above the liquid surface, and a liquid in the liquid container which is ejected toward the object to be applied passing through the liquid container to be applied. Liquid ejection means for attaching a liquid to an object,
Liquid supply means for supplying the liquid in the liquid container to the liquid discharge means, and liquid removal means for removing the liquid while leaving a predetermined amount of adhesion from the surface of the object to which the liquid is applied by the liquid discharge means. Have. Accordingly, the liquid is ejected toward the application target that linearly passes through the liquid container, so that the liquid is applied without bending the application target.

According to a second aspect of the present invention, in the liquid applying apparatus according to the first aspect, a liquid detecting means for detecting the liquid discharged from the liquid discharging means, and the liquid detected by the liquid detecting means is discharged in a predetermined manner. Alarm means for issuing a predetermined alarm when the amount becomes equal to or less than the amount. Thus, in addition to the effect of the first aspect, when the amount of liquid discharged from the liquid discharging unit decreases, a warning is issued by the warning unit, so that the liquid discharge failure is immediately notified.

According to a third aspect of the present invention, in the liquid application apparatus according to the first or second aspect, a pump as the liquid supply means, an electric motor for driving the pump, and a reduction in electric current of the electric motor due to reduction of the load on the electric motor. And an alarming means for issuing an alarm when the detected value of the current detecting means becomes equal to or less than a predetermined value. Thereby, claim 1
In addition to the effect of 2 or 3, when the amount of liquid in the liquid container is reduced and a decrease in the electric current of the electric motor due to a reduction in the load on the pump is detected, an alarm is issued by the alarm means. Will be notified promptly.

[0008]

1 to 6 show an embodiment of the present invention. FIG. 1 is a front view of a liquid coating apparatus, FIG. 2 is a side view thereof, and FIG. FIG. 4 is a front view of the main part, FIG. 5 is a schematic configuration diagram thereof, and FIG. 6 is a flowchart showing the operation of the control unit.

This liquid application apparatus is an apparatus for applying a liquid B such as an adhesive to a mandrel A as an object to be applied.
Liquid container 1 containing liquid B to be applied to mandrel A
A nozzle 2 for discharging the liquid B toward the mandrel A in the liquid container 1, a pump 3 for supplying the liquid B in the liquid container 1 to the nozzle 2, and an electric motor 4 for driving the pump 3;
A scraper 5 for removing excess liquid B from the surface of the mandrel A, a pair of optical sensors 6 and 7 for detecting the liquid B discharged from the nozzle 2, a current detector 8 for detecting a drive current of the electric motor 4, An alarm device 9 that issues an alarm when the remaining amount of the liquid B decreases, and a control unit 1 that controls the operation of the alarm device 9 based on the detection results of the optical sensors 6 and 7 and the current detector 8.
0.

The liquid container 1 is formed in a box shape with one side surface having an L-shape. On both side surfaces, insertion ports 1a for inserting the mandrel A are provided so as to face in the horizontal direction. In addition, the bottom surface of the liquid container 1 is formed so as to be inclined so that a part thereof is lower than the surroundings, and viewing windows 1b for visually observing the inside are provided at a total of three places on the upper surface and the back surface.

The nozzle 2 is disposed in the upper part of the liquid container 1, and the discharge port of the liquid B is formed to be elongated in the width direction.
That is, the liquid B discharged from the nozzle 2 is the mandrel A
Is ejected so as to form a form that is spread perpendicular to the longitudinal direction of the ink.

The pump 3 has a suction side connected to a bottom surface of the liquid container 1 via a pipe 3a, and a discharge side connected to a nozzle 2 in the liquid container 1 via a pipe 3b.

The electric motor 4 is connected to a rotating shaft of the pump 3 via a driving belt 4a, and is driven by electric power supplied from a power source (not shown).

The scraper 5 is formed of an elastic material such as rubber, and is disposed so as to cover the outlet side insertion port 1a of the liquid container 1 from the inside. A hole 5a through which the mandrel A is inserted is provided at the center of the scraper 5, and the hole 5a is formed slightly smaller than the outer diameter of the mandrel A, and the periphery of the hole 5a is pressed against the mandrel A by the elasticity of the scraper 5. It has become. In addition, the scraper 5 is a liquid container 1
Are held by a pair of annular mounting plates 5b provided on the inner surface of the mounting plate, and the mounting plates 5b are separably connected to each other by thumb screws 5c. Therefore, by separating each mounting plate 5b, the scraper 5 can be replaced with one having a different diameter of the hole 5a according to the outer diameter of the mandrel A.

The optical sensors 6 and 7 form a light emitting side and a light receiving side, respectively, and are arranged on both sides of the liquid container 1 so as to face each other with the lower part of the nozzle 2 therebetween. That is, the light between the optical sensors 6 and 7 is blocked by the liquid B discharged from the nozzle 2, and the amount of light reaching the sensor 7 on the light receiving side is detected according to the amount of the liquid B discharged. .

The current detector 8 is connected to a drive circuit (not shown) of the motor 4 and detects a current value that changes according to the load of the motor 4.

The alarm device 9 comprises, for example, a plurality of display lamps which are turned on in accordance with a predetermined situation, and a first display portion 9a (for example, a green display) indicating that the discharge amount of the liquid B is sufficient.
And a second display unit 9b (for example, yellow display) indicating that the discharge amount of the liquid B may be insufficient, and a third display unit 9c (indicating that the discharge amount of the liquid B is insufficient). (For example, red display).

The control unit 10 is constituted by a microcomputer, and is connected to each of the optical sensors 6 and 7, the current detector 8 and the alarm device 9, respectively.

In the liquid applicator constructed as described above, the mandrel A is linearly inserted into the liquid container 1 through each insertion hole 1a, and is moved toward one side in the longitudinal direction by a not-shown conveying means. At that time, the electric motor 4
As a result, the pump 3 is driven, and the liquid B in the liquid container 1 is discharged from the nozzle 2, and the liquid B adheres to the mandrel A passing below. In this case, the liquid B that has not adhered to the mandrel A is stored in the liquid container 1 again. Further, the mandrel A having the liquid B attached thereto in the liquid container 1
When the liquid B passes through the outlet side insertion port 1a, the liquid B on the surface is removed by the scraper 5 while leaving a fixed amount, and a constant amount of the liquid B is always applied and the liquid B is discharged from the liquid container 1.

Next, the operation of the control unit 10 will be described with reference to the flowchart of FIG. First, the pump 3 is operating (S1), the detection value I of the current detector 8 is not smaller than the predetermined lower limit I0 (S2), and the light receiving amount L of the light sensor 7 on the light receiving side is set to the predetermined upper limit. If the value is not larger than the value L0 (S3), the first display section 9a of the alarm device 9 is displayed (S4), and the process returns to step S1. Further, when the amount of the liquid B in the liquid container 1 decreases, the discharge pressure of the pump 3, that is, the load on the electric motor 4 is reduced and the driving current is reduced, so that the detection value I of the current detector 8 is lower than the lower limit value I0. Is also smaller (S
2) If the received light amount L of the optical sensor 7 is not larger than the upper limit L0 (S5), the second display section 9b of the alarm device 9 is displayed (S6), and the process returns to step S1. Next, if the amount of the liquid B is extremely reduced or the liquid supply conduit is clogged, the amount of liquid discharged from the nozzle 2 becomes thin. Therefore, in step S3 or S5, the light receiving amount L of the optical sensor 7 is reduced. Exceeds the upper limit L0, the third display 9c of the alarm device 9 is displayed (S7), and the process returns to step S1. The electric motor 4
If the pump 3 is not operating in step S1 due to a failure or the like, the third display unit 9c of the alarm device 9 is displayed (S7).

As described above, according to the liquid applying apparatus of the present embodiment, the mandrel A is moved linearly in the liquid container 1, and the liquid B is supplied from the nozzle 2 to the mandrel A passing through the liquid container 1. Since the liquid is ejected, even if the mandrel A has a large diameter and is difficult to bend, the liquid B can be easily discharged without requiring a long space.
Can be applied. In addition, the liquid B is discharged between the pair of optical sensors 6 and 7 with the discharge portion of the liquid B interposed therebetween.
Since the ejection amount of the liquid B is detected, it is possible to promptly notify the ejection failure of the liquid B, and it is possible to reliably prevent the application unevenness. Further, since the reduction of the load on the electric motor 4 is detected by detecting the current of the electric motor 4 of the pump 3, it is possible to promptly notify that the amount of the liquid B in the liquid container 1 has decreased, Discharge failure of the liquid B can be prevented beforehand.

FIGS. 7 and 8 show another embodiment of the liquid removing means, which can be provided instead of the scraper 5. That is, the liquid removing means shown in the figure is composed of an air discharge pipe 11 formed in an annular shape, and a number of holes 11a opening toward the center are provided at equal intervals in the inside thereof. An air supply pipe 11b is connected to one end of the air discharge pipe 11, and the air supply pipe 1
1b is connected to an air supply source such as an air compressor (not shown). That is, the mandrel A to which the liquid B is adhered passes through the center of the air discharge pipe 11, and at this time, the excess liquid B is discharged from the surface of the mandrel A by the wind pressure of the air discharged from the hole 11a of the air discharge pipe 11. Is to be removed.

In the above-described embodiment, the optical sensors 6 and 7 are used as the liquid detecting means. However, other detectors having the same function, such as an ultrasonic sensor, may be used. If a meter relay (ammeter with contacts) is used as the current detecting means, the control system can be easily configured. Furthermore, in the above-described embodiment, a mandrel for manufacturing a hose is shown as an application object, but the present invention can be applied to other long application objects such as various pipes, shafts or electric wires.

[0024]

As described above, according to the liquid application apparatus of the first aspect, even if the object to be applied is difficult to bend, the liquid can be easily applied without requiring a long space. Since it is possible, it is advantageous for reduction of the coating equipment and improvement of productivity.

Further, according to the liquid application device of the second aspect,
In addition to the effect of the first aspect, since the liquid ejection failure can be promptly notified, the application unevenness can be reliably prevented.

Further, according to the liquid application device of the third aspect,
In addition to the effect of claim 1 or 2, it is possible to promptly notify that the amount of liquid in the liquid container has decreased,
Liquid ejection failure can be prevented beforehand.

[Brief description of the drawings]

FIG. 1 is a front view of a liquid application apparatus according to an embodiment of the present invention.

FIG. 2 is a side view of the liquid application device.

FIG. 3 is a side sectional view of a main part of the liquid application device.

FIG. 4 is a front view of a main part of the liquid application device.

FIG. 5 is a schematic configuration diagram of a liquid application device.

FIG. 6 is a flowchart showing the operation of the control unit.

FIG. 7 is a front view of an air discharge pipe showing another embodiment of the liquid removing means.

FIG. 8 is a side sectional view of an air discharge pipe.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Liquid container, 2 ... Nozzle, 3 ... Pump, 4 ... Electric motor,
5 ... Scraper, 6,7 ... Optical sensor, 8 ... Current detector,
9 alarm device, 10 control unit, 11 air discharge pipe,
A: mandrel, B: liquid.

Claims (3)

[Claims] 1. A liquid application device for applying a liquid to a long object to be coated, wherein the liquid to be applied to the object to be applied is stored, and the object to be applied is linearly formed in a longitudinal direction above the liquid surface. A liquid container that allows the liquid in the liquid container to pass through the liquid container toward the object to be applied, and adheres the liquid to the object to be applied; And a liquid removing means for removing the liquid while leaving a predetermined amount of adhesion from the surface of the object to which the liquid is applied by the liquid discharging means. apparatus. 2. A liquid detecting means for detecting a liquid discharged from the liquid discharging means, and an alarm means for issuing a predetermined alarm when the liquid detected by the liquid detecting means falls below a predetermined discharge amount. The liquid application device according to claim 1, wherein: 3. A pump as the liquid feeding means, an electric motor for driving the pump, current detecting means for detecting a decrease in electric current of the electric motor due to reduction of the load on the electric motor, and a detection value of the electric current detecting means being a predetermined value. 3. The liquid application apparatus according to claim 1, further comprising an alarm unit that issues an alarm when the following occurs.