JPS6021778B2 - High viscosity fluid coating machine - Google Patents

Description

[Detailed description of the invention] The present invention relates to a high viscosity fluid coating machine.

Recently, for the purpose of heavy-duty corrosion protection of marine steel structures, high-viscosity Pingam fluid is sprayed onto the steel surface to apply a thick coating of 5 to 6 capes.
We provide long-term anti-corrosion coating for Spratschzoso and Tidal Zone where cathodic protection is not effective.

Conventionally, painting high viscosity fluids such as resin mortar has been done manually by troweling or by spraying with a mortar gun, but the work efficiency is low and at the same time, the finish of the painted surface is poor, making it difficult to achieve a uniform film thickness. Also, continuous painting work on scaffolding was difficult. A particular problem when spraying with a mortar gun is that when it comes to complex structures, it is possible to paint vertical surfaces, but when painting the top and bottom surfaces, etc., the paint inside the cup overflows to the outside. This was a major hindrance to my work. The object of the present invention is to be able to perform continuous spraying work, to be free in the position of the painting work, and to be able to freely move the paint sprayer onto a scaffold. Painting with high viscosity fluids such as resin mortar (epoxy resin containing aggregates, etc.) has traditionally been done manually with a trowel, but this is a job that requires skill and experience, and can easily be applied with general paints. It cannot be carried out as a similar painting work.

In addition, in the case of a mortar gun, a separately mixed material is put into the gun cup little by little and air atomized, but if the material becomes highly viscous, it is difficult to atomize it and discharge it, making it difficult to obtain a smooth painted surface. , and therefore lacks universality for this type of material. Further, even when the viscosity is low and atomization is good, the amount of combined material in the cup is small, so the material must be fed frequently, which wastes a lot of time during the spray painting operation. On the other hand, if the cup is made larger and a large amount is supplied at once, it will become heavier and the spraying work efficiency will be significantly lowered, and at the same time, the paint will overflow from the cup, making it impossible to maintain an arbitrary position for painting work. As described above, spray painting work using a mortar gun is subject to restrictions on the work itself, and work efficiency (because the atomization distribution is small) is low, leaving problems in film thickness control, finish quality, etc.

This invention was made in view of the above points, and consists of putting a high viscosity fluid into a hopper, placing the hopper on a movable trolley, and
A screw pump installed at the bottom of the hopper, a pressure sensing device installed near the discharge port of the screw pump for detecting the upper and lower limits for measuring the discharge pressure of high viscosity fluid, and a signal from the pressure sensing device to detect the high pressure. A drive device that starts and stops the screw pump according to the pressure of the viscous fluid and a spray gun connected to the screw pump via a hose or the like are provided, and the high viscosity fluid is sprayed from the hopper to the spray gun body via the hose or the like. It is designed to be fed under pressure.

An embodiment of the present invention will be described below based on the drawings.

Fig. 1 is a side view of the machine, Fig. 2 is a front view, and Fig. 3 is a control system diagram.

In the figure, 6 is a cart, which is movable by two fixed wheels 60 and two caster wheels 61.

A brake pedal 62 is provided on the caster wheel 61, so that the trolley 6 can be moved in any direction and fixed as appropriate. The truck 6 is equipped with a hopper 5 into which a high viscosity fluid (for example, resin mortar) is placed. In this embodiment, the hopper 5 has a capacity of 60 to 100k9, but the capacity can be increased or decreased as necessary.
A screw pump 2 is provided at the bottom of the hopper 5, and as shown in FIG. 3, the high viscosity fluid is pumped from the discharge port 20 to the gun body 8 through the hose 7 and the like. A pressure sensing device 3 is provided near the discharge port 20 to detect the upper and lower limits of the high viscosity fluid. In this embodiment, pressure switches are used as the pressure sensitive device 3, and are a pressure switch 30 for setting an upper limit value and a pressure switch 31 for setting a lower limit value. Each switch 30
, 31 are each equipped with a pressure gauge. In this embodiment, an air motor 1 is used as a drive device for the screw pump 2, and is mounted on the upper part of a truck 6.

In this embodiment, the air motor 1 and the screw pump 2 are connected by extending the wire 21 of the screw pump 2 through the inside of the hopper 5, and connecting the V-belt 64 and the pulley 65 inside the cover 63.
66 to transmit rotation. A rotation speed meter 22 is provided on the extension line of the koji core of the screw pump 2,
Additionally, a rotation totalizer 23 is provided in motion. This rotation totalizer 23 is used to totalize the number of operating rotations of the screw pump 2 regardless of whether it rotates in the forward direction or in the reverse direction, so as to know when to replace the screw pump according to its service life. The air motor 1' operates according to a signal from the pressure sensitive device 3.

In this embodiment, an electromagnetic directional switching valve 10 is provided between the air motor 1 and a compressed air source (not shown). It is connected to 31. When the discharge pressure of high viscosity fluid becomes larger than the upper limit value, the pressure switch 30 for setting the upper limit value
is activated, the switching valve 10 is closed by relay operation, the compressed air is cut off, and the air motor 1 is stopped. Further, when the discharge pressure becomes smaller than the lower limit value, the lower limit value setting pressure switch 31 is activated to open the switching valve 10 and start the air motor 1 through compressed air. Note that 33 is a power switch, 34 is a power indicator lamp, 35 is an air motor operation indicator lamp, and 36 is a battery. FIG. 4 shows a circuit diagram showing these connection relationships. The air motor 1 is further provided with an air switching valve 11 and speed controllers 12 and 13.

The air switching valve 11 is used to rotate the air motor 1 in the forward and reverse directions by operating the handle lever 11' left and right. The speed controllers 12 and 13 are for controlling the rotational speed of the air motor 1 during normal rotation and reverse rotation, and increasing or decreasing the rotation speed. 14 is an inlet for compressed air that serves as a power source; 15 is a pressure regulator; 15
' indicates a pressure gauge, and 17 indicates a silencer.

16 is an oiler, and the compressed air that comes out from it goes to the switching valve 11.
The air is introduced into the air motor 1 via the input ports 12, 13 and the directional switching valve 10.

In the present invention, there are no particular limitations on the gun body 8 and the atomizing nozzle that are connected to the discharge port 20 via a hose or the like; If the atomizing nozzle disclosed in Mitsjo No. 53-171354 is used, a uniform pattern with a wide coating atomization area can be obtained, and a coating film with a good finish can be obtained.

Note that 80 is a ball pipe, and 81 is an atomizing air supply pipe. Next, when using this machine, a high viscosity fluid to be coated such as resin mortar is put into the hopper 5, and a gun body 8 such as a mortar gun is connected to the discharge port 20 via a paint hose 7 or the like.

As mentioned above, as the twilling nozzle for this gun body, the one already proposed by the applicant is recommended.
Next, when the connection port 14 is connected to a compressed air source and the air motor 1 is driven, the screw pump 2 is activated and the high viscosity fluid is continuously pumped into the gun body 8. This feeding pressure is determined by the pressure switches 30 and 31 of the pressure sensing device 3.
is detected, the electromagnetic directional switching valve 10 is operated, the air motor 1 is turned on and off, and the pressure is maintained within the 1-Z constant pressure range.

By configuring the discharge pressure to be automatically maintained within a constant pressure in this way, compared to a configuration that maintains a constant pressure manually, there is a reduction in the number of operators, eliminating the need for coordination and skill among workers, and reducing pressure. It is possible to effectively reduce fluctuations, thereby making the quality of the coating film uniform, and preventing damage to the paint hose, screw pump, etc. due to excessive discharge pressure. Also, the amount of atomization discharged per unit time varies depending on the model of the atomization convenience nozzle during painting, the painting environment, conditions, etc., but if a pump discharge base is not attached, paint in the hose is required. If the hose is compressed too much, it will cause warping inside the hose, which will interfere with painting, so the speed controllers 12 and 13 are used to obtain the necessary rotational speed. In this case, adjustment is made using the tachometer 22 so that a predetermined discharge amount can be obtained from a graph obtained separately as shown in FIG. The conditions for obtaining this graph are as follows.

Test paint: Solvent-free epoxy resin mixture liquid
Temperature: 20 C Viscosity: 300 poise Specific gravity: 1.78 (2000) Hose diameter: Inner diameter 34 skin Hose length: 4.5 m Kyosho: Average discharge amount per rotation of blood pump ball: Approximately 5 female painting work In order to do so, the operator only needs to transport the machine along with the trolley 6 to a work area such as a scaffold board, secure it with the brake pedal 62, and hold the gun body and some of the attached painting hoses.

Therefore, the posture during painting can be maintained arbitrarily, and painting of the upper surface, lower surface, etc. can be easily performed. Further, the hopper 5 can have a large capacity if necessary, and by combining high viscosity fluids one after another, it is possible to spray a large amount of high viscosity fluids continuously. As explained below, according to the present invention, it is possible to carry out continuous spraying work, and the painting work position is free and the painting machine can be freely transported on the scaffolding, resulting in extremely high workability. Ru.

In addition, since the discharge pressure is automatically maintained within a certain range between the upper and lower limits, there is no need for personnel to adjust the pressure, ensuring uniform coating film quality, and further preventing damage caused by excessive pressure. It has excellent effects such as preventing damage to equipment and extending its life.

[Brief explanation of the drawing]

Fig. 1 is a side view of an embodiment of the present invention, Fig. 2 is a front view thereof, Fig. 3 is a control system diagram, Fig. 4 is a circuit 0 diagram, and Fig. 5 is a diagram showing pump shaft rotation speed and discharge base. It is a graph showing the relationship between. 1... Air motor, 2... Screw pump, 3... Pressure sensing device, 4... Drive device, 5... Hopper,
6...Dolly, 7...Hose, 8...
...Gun body, 10 evenings...Solenoid directional switching valve, 11...Air switching valve, 12, 13...Speed controller, 14...Compressed air connection Port, 15... Pressure regulator, 16... Oiler, 17... Silencer, 20... Discharge port, 21
...Axis, 22...Rotational speed meter, 23...
0... Rotation totalizer, 30, 31... Pressure switch, 32... Operation panel, 33... Power switch, 34... Power indicator lamp , 35...
...Air motor operation indicator lamp, 36...
・Battery, 60... Fixed wheel, 61... Caster wheel, 62... Brake betadal, 63... Cover, 64... V belt, 65, 66... Pulley, 80
... Ball valve, 81 ... Air supply pipe for atomization. Figure 1 Figure 2 Figure 4 Figure 3 Figure 5

Claims (1)

[Claims] 1. A movable cart, a hopper for high viscosity fluid placed on the cart, a screw pump installed at the bottom of the hopper for pumping the high viscosity fluid, and a screw pump installed near the discharge port of the screw pump for pumping high viscosity fluid. A pressure sensing device that operates when the viscosity fluid reaches a predetermined upper and lower limit, a drive device that starts and stops the screw pump in response to a signal from the pressure sensing device, and a hose or the like at the screw pump discharge port. A spray gun connected through a high viscosity fluid coating machine.