JP2004330168A - Spray gun equipped with pressure detection means - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a spray gun equipped with a pressure detection means which does not affect normal use, so that an operator can always recognize a correct pressure at hand because appropriate control of air spray pressure is required in order to carry out stable painting. <P>SOLUTION: The spray gun equipped with the pressure detection means is provided with a means to introduce the pressure to a part connected to an air passageway of the spray gun(receiving the pressure). The means is kept shielded from the outside in normal use. The means is opened with a measuring instrument at the time of measuring the pressure and the pressure is measured with communicating air. When the measuring instrument is disconnected, the passageway is closed. Moreover, the pressure is detected and indicated by installing a built-in pressure sensor facing the air passageway and exposing the takeoff terminal of the sensor on the outside of the spray gun, and by retrieving sensor data by contacting the takeoff terminal at the time of the measurement. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
An air spray gun that atomizes paint with compressed air and applies it to the object to be painted, grasps the spraying air pressure and maintains a controlled condition to obtain a stable quality painted object, Sometimes a spray gun is used that allows the operator to check the pressure at hand. The present invention relates to a spray gun which can be read without any inconvenience during ordinary use and maintenance of an operator, and can be read and checked immediately when it is necessary to check the pressure.
[0002]
[Prior art]
In the air spray gun, the blowing air pressure has a great effect on the quality of the finish, and also has an effect on the scattering of the atomized paint. That is, it is said that when the air pressure is high, the energy of the ejection increases, and the paint is atomized more finely and the finish is generally improved. On the other hand, finely atomized paint particles are susceptible to the airflow and the mist is scattered more. For this purpose, an appropriate spray pressure is selected and recommended depending on the spray gun, the paint, the object to be coated, and various conditions of the coating. In order to perform good coating, it is desirable that the pressure of the air used in the spraying operation be grasped and used under controlled conditions. In particular, in recent years, spray guns have been reduced in pressure for the purpose of preventing scattering and the like, and the coating quality has a great influence on a slight change in spraying pressure. For example, when the coating colors of the objects sequentially fed are different, the atomization conditions are different due to the difference in the properties of the paint, and the spraying pressure is often changed by a spray gun prepared for each color.
[0003]
The spray pressure is adjusted by a pressure reducing valve or the like, and is supplied to the spray gun by an air hose. Conventionally, the worker rarely checks the pressure during the spraying operation, but the adjustment in the pressure range set in order to obtain a stable coating quality as described above is regarded as important, and it is difficult to check at hand. It has become necessary. In addition, based on the stabilization of quality, standard work management allows the work to be continued at a specified range of pressure regardless of the skill and feeling of the worker. Required.
[0004]
The method of directly attaching a pressure gauge to a spray gun and using it has been usually used in painting tests and the like in order to obtain quantitative data. In this method, a general-purpose pressure gauge is attached to an air hose attachment portion of a spray gun. However, due to its weight and size, daily work is hindered, and it has hardly been used in actual painting.
[0005]
However, there has been proposed a method in which a small pressure gauge is directly attached to the spray gun and can always be checked even during the work, and the operability is not affected in use (actually, Japanese Utility Model Publication No. 5-227777). ). In this case, the pressure gauge is a so-called Bourdon tube type pressure gauge having an analog display, and it is not satisfactory in terms of accuracy and durability in a use environment because it is necessary to reduce the size in mounting. Further, when the spray gun is cleaned with a thinner or the like, there are problems that it is necessary to prevent the thinner from being applied to the pressure gauge and that an automatic cleaning machine cannot be used.
[0006]
In order to solve the above maintenance problem and to provide an accurate pressure display, a technology in which a pressure sensor is used to hermetically incorporate the pressure gauge itself into the gun body and digitally display the same is proposed in, for example, Published Japanese Patent Application No. 5-506310. However, in this case, the pressure gauge unit is housed in a closed container, and a costly expensive investment such as the use of a driving battery is required. There are many problems in practice, such as the nature and increase of waste.
[0007]
[Problems to be solved by the invention]
The present invention provides a spray gun that can be used to check the spray pressure immediately when needed and can be standardized for the operation when it is used. In addition, the spray gun minimizes costs and increases equipment costs. It is an object of the present invention to provide a spray gun that can be handled in the same manner as a conventional spray gun even in daily maintenance without applying any trouble.
[0008]
Another problem is to provide a spray gun that can perform not only data confirmation but also control and management that is set in advance by the data by easily extracting pressure. It is necessary that these spray guns can be used safely without causing factors that impair workability during normal use and without giving rise to a configuration affected by electricity and solvents.
[0009]
[Means for Solving the Problems]
In order to solve the above-described problems, the present invention provides an atomizing device for atomizing paint with compressed air and applying the atomized paint to an object to be coated, an air inlet for compressed air ejected from the atomizing device, and an atomizing device. A spray gun provided with an air passage communicating the device and the air inlet is provided with pressure detecting means, one facing part of the internal air passage and the other facing the outside of the spray gun. The pressure detecting means is configured as a detection valve in which the air pressure in the internal air passage acts on the measuring instrument when the pressure measuring instrument is engaged, and is shut off from the outside when the measuring instrument is removed. In normal use, the measuring tool and the spray gun are separate and engaged with each other when measurement is required. Of course, it is also possible to use it while engaging as needed.
[0010]
One of the pressure detecting means is constituted by a check valve which is opened by pressing from the outside and closed by releasing the pressing. This detection valve may be incorporated in a joint or the like attached to the spray gun. As long as the engagement portion with the measuring tool can be connected to each other in an airtight state, a means that can be detached simply by pressing or a screw or fitting may be used.
[0011]
Further, the pressure detecting means incorporates a detection object having a sensor for sensing the pressure of the air passage into the spray gun, and exposes an input / output terminal of the sensor to the outside of the spray gun. Can be connected to measure the internal pressure.
[0012]
As the detection body, a pressure sensor is used in which a signal is sent from the measurement device when the input / output terminal comes into contact with the connection terminal of the measurement device, and a signal corresponding to the sensed pressure is returned to the measurement device. Further, the input / output terminal forms an outer surface integrally with the exposed outer surface of the spray gun, and is airtightly isolated from the inside.
In other words, only the contact surface is exposed on the outer surface of the spray gun to prevent paint and thinner from entering. Of course, there is no restriction on arranging them at positions where these effects are small.
[0013]
BEST MODE FOR CARRYING OUT THE INVENTION
The spray gun shown in FIG. 1 is shown as an example when the present invention is implemented. The spray gun 1 is a manual spray gun operated by a trigger 2, and includes an atomizing device mainly described by an atomizing air cap 3, a paint nozzle 4, a paint adjusting device 5, a pattern adjusting device 6, an air A barrel 8 provided with a valve 7 and a grip 9 extending downward at the rear of the barrel 8 are formed. A connection joint 12 forming an air inlet 10 is attached to a lower portion of the grip portion 9.
[0014]
The air inlet 10 and the atomizing device are connected by an air passage 13, and the air valve 7 and the adjusting valve 61 of the pattern adjusting device 6 are arranged in a part of the passage. In the present embodiment, the pressure detecting means 20 is disposed above the air valve 7 and the regulating valve 61. The pressure detecting means 20 has a check valve configuration as a whole. The valve body 21 is tightly screwed into the spray gun body 11 and fixed. The valve 23 that engages with the seating surface 22 and shuts off the passage is pressed by the resilient member 24 from the rear and is constantly in contact with the seating surface 22. A valve stem 26 is formed in front of the valve 23 and extends to the outside opening 25 of the valve body 21. The valve stem 26 is pushed in to open the valve, so that the pressure in the air passage 13 can be taken out.
[0015]
The shapes of the outer opening 25 and the stem 26 of the valve body 21 are determined in relation to the engaging portion of the measuring instrument 30 for measuring pressure. In the example shown in FIG. 2, a measuring tool 30 indicated by a dotted line is a generally used digital pressure gauge, and a packing 32 for preventing leakage and a pressing tool 33 for the valve stem 26 are arranged at the tip of a measuring port 31. I have. When the packing 32 is pressed in a compressed state while the packing 32 is in contact with the end of the external opening 25, the pressing tool 33 presses the valve rod 26 to open the valve 23, and the internal pressure is reduced by the measuring tool 30. Is configured to work in the measurement port 31.
[0016]
Since the engagement portion needs to open the valve while being displaced in a close contact state, if it is possible to provide a leak prevention means made of a material that is easily deformed in the contact portion of either the measurement port 31 or the external opening 25, it will be appreciated that It is not necessary to be limited to the two examples. FIG. 3 shows another embodiment in which the leak preventing means 34 is provided on the pressure detecting means side.
The mounting position of the pressure detecting means 20 may be a point communicating with a part of the internal air passage 13 of the spray gun which needs to be measured, and a communication passage connecting the pressure detecting means 20 and the air passage 13 depending on the mounting position. May be provided separately. Further, the opening 25 can be provided with a lid so that the paint does not enter during normal use and the valve is not opened carelessly. Further, it is possible to provide a detachable means such as screwing in so that the measuring tool can be temporarily fixed.
[0017]
As described above, the coating operation is performed by the spray gun having the measurement valve as the pressure detecting means 20. When the measurement and confirmation of the pressure is required, the pressure can be immediately detected simply by pressing the measuring tool. It can be used like a normal spray gun at the time of painting without removing the air hose and attaching the pressure gauge, or removing it because it deteriorates the operability at the time of work. Also, since there is no pressure gauge on the spray gun for maintenance, cleaning work using a thinner etc. does not have to be troublesome, and cleaning by spraying the thinner over the entire spray gun using a gun washer should be performed without problems. Can be.
[0018]
4 and 5 show a case where a pressure detecting means is provided at a joint of an air supply port of a spray gun. FIG. 4 is an external view of the spray gun. As shown in FIG. 5 in detail, a pressure detecting means 41 is incorporated in the connection joint 12. The detecting means may have the same configuration as in FIG. If necessary, as shown by the dotted line in FIG. 5, it is possible to provide a removable cap 44 so that the paint or the like does not directly enter, but it is desirable that the removal can be easily performed. By incorporating the pressure detecting means 41 into a part of the attachment part connected to the air passage of the spray gun as in this example, the joint of the normal spray gun and the like can be replaced with the joint of the present example without directly changing the spray gun body. It is possible to achieve the object of the present invention simply by exchanging.
[0019]
Another proposal of the present invention shows a case where a pressure sensor is incorporated in the configuration of the pressure detecting means. FIG. 6 showing only this part is an example, in which a pressure detecting means 35 is embedded with a sensor 36 using a strain sensor facing the air passage, and a terminal 37 for inputting / outputting a signal fluctuating by strain is connected to a spray gun. Is exposed as a connection outside. Therefore, the external and internal sensing elements 36 are reliably shut off, and the spray gun has no display means, as in the case where the check valve is incorporated.
[0020]
When confirming the pressure, the pressure can be confirmed immediately by connecting the measuring terminal of the measuring instrument separately formed to the terminal 37. Although a measuring tool is not shown, means for outputting an electric signal for detection, receiving a displacement signal returned through a strain sensor, converting the signal into a digital signal, and displaying the digital signal is incorporated. Several generally used methods are used for the terminals, and a method of only contacting and a method of locking by fitting or the like are employed as necessary. If only a temporary check is necessary at the time of contact, it is sufficient to provide a necessary contact surface.
[0021]
In the case where sensor data is taken out and displayed for a certain period of time or used as a control signal for management, a reliable connection method is adopted. The position of the terminal 37 can be provided at an arbitrary position away from the sensor via the cable 38. If it is used as a special coating machine with a control function as a spray gun, it can be taken out together with a hose or cord to be connected and connected to a measuring instrument.
[0022]
In any case, according to the present invention, instead of attaching the pressure gauge itself to the spray gun, a valve for taking out pressure or a sensor for sensing displacement due to pressure is attached. When it is not necessary to provide a substrate for use, a display unit, and the like, and it is necessary to check the pressure, it is sufficient that one dedicated measuring device is provided.
[0023]
Further, the pressure is converted into an electric signal to be digitally displayed, and a power supply for use as a control signal, a conversion means such as a control board, a storage operation device, and the like are placed on the measuring tool separately from the spray gun. Can be. For this reason, it can be incorporated into the measuring tool without being limited to measures for paints and solvents to be used, safety measures, etc., so that the preset spraying conditions of the paint can be stored and the appropriate pressure can be easily adjusted. In addition, it is possible to easily perform the control for notifying the propriety by an alarm or the like.
[0024]
【The invention's effect】
As described above, according to the present invention, when it is necessary to check the spray pressure, which is an important condition in using the spray gun, with the operator's hand, a spray gun that can easily cope with the spray pressure is obtained. It can be easily used for management. These effects are not limited to the structure of the spray gun, but can be similarly obtained with a spray gun using air pressure.
[0025]
Each spray gun is provided with a minimum configuration, such as a pressure extraction valve or a sensor for detecting pressure, and can immediately measure pressure when needed. Moreover, it is possible to obtain a spray gun that is excellent in safety and durability without any means that may cause problems due to the influence of electric or solvent, and one measuring tool can be used for several spray guns. If there is, the object can be achieved, and equipment can be used at a low cost and for a large number of spray guns.
[0026]
In addition, since measuring instruments such as digital pressure gauges can be separated during normal use, storage devices and control mechanisms should be provided without worrying about the safety, size, and cost of incorporating them into individual spray guns. Therefore, standardization of work in spray coating, improvement of workability, facilitation of management, and the like can be achieved.
[Brief description of the drawings]
FIG. 1 is a sectional configuration view of a spray gun provided with an embodiment of the present invention.
FIG. 2 is a sectional view showing one embodiment of a pressure detecting means.
FIG. 3 is a sectional view showing another embodiment of the pressure detecting means.
FIG. 4 is an external view of a spray gun provided with a pressure detecting means of the present invention at a joint of a spray gun grip portion.
FIG. 5 is an enlarged sectional view of a joint portion A of FIG. 4;
FIG. 6 is a configuration diagram showing an embodiment in which a sensing element is incorporated as pressure detection means.
[Explanation of symbols]
1, spray gun 3, air cap 7, air valve 10, air inlet 11, spray gun main body 12, connection joint 13, air passage 20, pressure detecting means 21, valve main body 26, valve stem 30, measuring tool 35. Pressure detecting means 36, sensing element 37, terminal 41. Pressure detection means

Claims (6)

An atomizer that atomizes paint with compressed air and a spray gun that has an air inlet for compressed air that is ejected from the atomizer, one facing the internal air passage and the other facing the outside of the spray gun. A pressure detecting means, wherein when the pressure measuring device is engaged, the air pressure in the internal air passage acts on the measuring device, and is shut off from the outside when the measuring device is removed. Spray gun. 2. The spray gun according to claim 1, wherein the pressure detecting means is a check valve which opens when the pressure is applied from the outside and closes when the pressure is released. 2. The spray gun according to claim 1, wherein the pressure detecting means is incorporated in a connection joint which is an air inlet. A spray gun provided with an atomizing device and an air inlet for compressed air ejected from the atomizing device is provided with pressure detecting means, one facing the internal air passage and the other facing the outside of the spray gun. A spray gun, wherein the detecting means includes a sensor for sensing the pressure in the air passage, and an input / output terminal of the sensor is exposed outside the spray gun. 5. The spray gun according to claim 4, wherein the sensor is a pressure sensor to which a signal is sent from the measuring tool when the input / output terminal comes in contact with the measuring tool and returns a signal corresponding to the sensed pressure to the measuring tool. The spray gun according to claim 4, wherein the input / output terminal forms an outer surface integrally with the exposed outer surface of the spray gun, and is airtightly isolated from the inside.

Images