JPS621792B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for pumping paint to a roller-type atomizer.

Conventionally, the method of using a pressurized tank is generally known as a method of force-feeding paint to a roller-type atomizer, but this requires temporary interruption of work to replenish the paint into the pressurized tank. After replenishing the paint, paint work cannot be performed until the pressure inside the pressurized tank is raised to a specified level. In order to eliminate these drawbacks, it is possible to use a method in which the paint is directly pumped into the roller-type paint device, and all that is required is to replenish the paint in a timely manner into the paint tank into which the pump's suction pipe is inserted. , the painting process can be carried out continuously without interruption.

However, although this method of directly pumping paint with a pump has been put to practical use in spray painting methods using spray guns, there is no practical example of this method in roller painting methods. This is because the paint used in spray painting methods has a relatively low viscosity and is free of aggregates, so various rotary pumps can be used without problems, but rollers The paints used in this method are often highly viscous, contain aggregates, etc., and are preferred for thick coating; therefore, general rotary pumps cannot be used in terms of durability and maintenance. Therefore, it has been considered to use a reciprocating pump, but since the discharge pressure pulsates, a means for absorbing the pulsation of the discharge pressure is required to prevent this from causing uneven coating. Furthermore, it is necessary to control the paint pressure on and off at the roller-type paint applicator, but in order to prevent the paint in the long piping from the pump to the paint applicator from flowing out of the applicator due to gravity, The pump must be turned on and off at the same time as the paint flow path is opened and closed using an on-off valve, and when the pump's power supply circuit is opened and closed using a switch linked to the on-off valve, in addition to this switch, the pump and the paint sprayer must be turned on and off. Electrical circuit wires must be installed in parallel on the long piping between the pumps, and a special pressure switch is required when installing a pressure switch to turn the pump's power circuit on and off in the pump discharge flow path. In addition, it is necessary to solve the problem that paint accumulates and solidifies in the paint pressure detection part of this pressure switch.

Due to the above points, the method of using a reciprocating pump to pump paint is not only significantly more expensive than the method of using a pressurized tank, but also
It is thought that there are various problems in terms of maintenance, and for this reason, in the past, despite the above-mentioned drawbacks, the only practical method for pumping paint to roller-type atomizers was using a pressurized tank. It was nothing more than a transformation.

The inventor of the present invention has repeatedly researched and tried a method for directly pumping paint to a roller-type paint sprayer without compromising on the above-mentioned circumstances, and has found that a pneumatically driven diaphragm-type reciprocating pump is suitable. You can learn that there is a simple method that does not have any practical problems, without using special means to absorb pulsating changes in pressure, such as pressure storage tanks, which have problems in terms of cost and treatment of accumulated paint. This led to this.

A preferred embodiment of the present invention will be described below with reference to the attached illustrative drawings. In FIG. Diaphragm type reciprocating pump, 5 is paint tank, 6 is paint tank 5
7 is a paint pressure feeding pipe that connects the discharge port of the pump 2 and the roller-type atomizer 1;
Reference numeral 8 denotes a paint passage opening/closing valve attached to the upper end of the handle 9 of the roller-type atomizer 1, and is equipped with a push button 10 that opens the passage when pressed.

The roller type paint device 1 will be explained based on FIGS. 2 to 5. Reference numeral 11 is a shaft tube, one end of which is connected via an elbow 12 to a paint supply tube 13 which also serves as a support rod, and the other end 14 is a shaft tube. It is closed, and paint outlet ports 15 are provided at appropriate intervals on the peripheral wall. The paint supply pipe 13 is connected to a handle 9 shown in FIG. 1 and communicated with an on-off valve 9. 1
Reference numeral 6 denotes a roller body rotatably fitted onto the shaft tube 11, and 17 is a cylindrical coating tool fitted onto the roller main body 16, which has a brush layer 19 formed on a cylindrical base fabric 18. It is.

The roller main body 16 includes two types of single units 20,
21, a terminal cap 22, a terminal boss 23, and a connecting wire 24.
1, the central convex portion 27 of the spacer 26 protruding from the side wall 25 of one unit 20 fits into the through hole provided in the side wall 28 of the other unit 21, so that both side walls 25,
A paint outflow passage 29 is formed between the parts 28 and the open inner and outer circumferential walls 30, 31 and 32, 33 of both units 20, 21 are mated with each other to form a closed cavity 34 into which no paint can flow. is formed. The bonding wire 24 extends from the single body 20 at the free end of the roller body 16 to the flange portion 35 of the terminal boss 23, which has a through hole into which the convex portion 27 of the single body 20 at the other end fits, and the spacer of each single body 20, 21. 26 and its central convex portion 27, and its ends are bent to connect each unit 20, 21 and the terminal boss 23 in the axial direction. The terminal cap 22 has a tap screw 3 screwed into a tap screw hole 37 of a column 36 formed inside the unit 20.
8, it is attached to the single body 20 at the free end.

The outer circumferential walls 32, 33 of each unit 20, 21 are formed in a tapered shape with a smaller diameter on the side where the paint outflow path 29 is located, and the outer surface has a protrusion whose length direction and top surface are parallel to the axis. 39 protrude at appropriate intervals in the circumferential direction, and form spaces 40 between the cylindrical coating tool 17 and the cylindrical base fabric 18. Also, each single unit 2
On the inner circumferential surfaces of the inner circumferential walls 30 and 31 of Nos. 0 and 21 facing the shaft pipe 11, protrusions 41 parallel to the axial direction are protruded at appropriate intervals in the circumferential direction. is formed between.

The terminal boss 23 rotates relative to the shaft tube 11 in close contact with the shaft tube 11, and is prevented from moving in the axial direction with respect to the shaft tube 11 by screwing into a cap nut 43 rotatably attached to the inner end of the elbow 12. . The cap nut 43 presses in the axial direction a presser plate 44 and a press ring 45 that clamp and fix the free end 18a of the cylindrical base cloth 18 of the cylindrical coating tool 17 between the flange portion 35 of the terminal boss 23. do. A rubber cord is looped through the free end 18a of the cylindrical base fabric 18.

Next, the diaphragm type reciprocating pump 2 will be explained based on FIG.
Two sets of chambers 57, 5 partitioned by diaphragms 55, 56 connected by an interlocking shaft 54 with stage ball valves 50, 51 and 52, 53 interposed therein.
8 and 59, 60, the outer chambers 57, 59,
between the two-stage ball valves 50, 51 and 52;
The flow path 6 is connected to the two parallel flow paths 48 and 49 between 53 and 53.
1 and 62, and the pressurized air 4 from the air compressor 3 is connected to 2 through the automatic switching valve 63.
The two inner chambers 58 and 60 are alternately supplied. The automatic switching valve 63 supplies pressurized air 4 to the chamber 60 and also supplies the chamber 58 as shown in the figure.
It is interlocked and connected to the interlocking shaft 54 so that it can be alternately switched between a state in which the air is exposed to the atmosphere and the opposite state at the end of the stroke of the interlocking shaft 54. Therefore, the chambers 57 and 59 are alternately compressed and expanded by the diaphragms 55 and 56 that move in response to the pressurized air 4, and when the chambers 57 and 59 are expanded, the ball valve 50 is opened.
or 52, the paint in the paint tank 5 is transferred to the paint suction pipe 6, the suction port 46, and the flow path 48, 61 or 49,
62 into the chamber 57 or 59, and then when the chamber 57 or 59 is compressed, the paint in the chamber 57 or 59 is drawn into the flow path 60, 48 or 62 by the ball valve 50 or 52 which becomes a closed path. , 49 to the discharge port 47.

By pressing the push button 10 to open the on-off valve 8 attached to the roller-type atomizer 1, the paint is pumped from the pump 2 through the pressure pipe 7, the flow path in the handle 9, the on-off valve 8, and the paint that also serves as a support rod. It is supplied into the shaft tube 11 via the supply pipe 13 and the elbow 12, and flows out from each outlet 15. This paint then flows into the space 40 between the roller body 16 and the cylindrical coating tool 17 via the outflow channels 42 and 29. This empty space 4
At 0, the paint spreads over the entire inner circumference of the cylindrical paint tool 17, flows through the base fabric 18, and forms the brush layer 19.
leaks to. In this state, the brush layer 19 is pressed against the surface to be painted, and the roller body 16 is moved into the cylindrical coating tool 1.
Coating is carried out by rolling it together with 7. When painting is to be interrupted, all that is required is to release the push button 10, close the on-off valve 8, and cut off the supply of paint to the shaft tube 11. At this time, the paint pressure in the chamber 57 or 59 being compressed by the diaphragm 55 or 56 in the pump 2 increases and becomes equal to the air pressure in the chamber 58 or 60 on the opposite side via the diaphragm 55 or 56. , the diaphragms 55 and 56 stand still together with the interlocking shaft 54. That is, the pump 2 automatically stops pumping.

The present invention can be implemented as described above,
Its feature is that it uses a pneumatically driven diaphragm reciprocating pump to directly feed the paint in the paint tank to the roller-type paint device without going through any means to absorb paint pressure pulsations. A protrusion is provided protrudingly around the rotating roller body to be fitted, and supports the tubular coating tool by contacting the inner surface of the cylindrical coating tool, and between adjacent protrusions, the rotating roller main body and A space is formed between the cylindrical paint tool and this space absorbs the pulsation of paint pressure caused by the pump, and the paint flow path is opened and closed by an on-off valve provided on the handle of the paint tool. Sometimes, the pump action is stopped by balancing driving air pressure and paint pressure in both chambers of the diaphragm of the pump.

According to the method for pumping paint to a roller-type paint applicator according to the present invention, paint can be replenished in a timely manner to the paint tank (which can also be used as a paint can) into which the suction pipe of the pump is inserted, or the suction pipe can be used to By simply replacing the paint can with another one filled with paint, the diaphragm reciprocating pump can effectively pump paint that cannot be pumped with a rotary pump to a roller paint sprayer, allowing continuous painting without interruption. Ru. Furthermore, since it is a reciprocating pump, the pressure of the discharged paint changes in pulsations, but the rotating roller main body 16 and cylindrical painting tool 17 of the roller-type atomizer do not require the use of a special accessory device to absorb this pulsation change.
By diffusing and flowing the paint into the space 40 formed between the pump and the pump, pulsating changes in paint pressure can be sufficiently absorbed, and uneven coating caused by pulsating changes in the paint discharge pressure from the pump can be reliably eliminated. It is. In addition, by closing the on-off valve 8 provided on the handle of the roller-type atomizer, the driving air pressure and the paint pressure are balanced in the diaphragm chambers 57, 58 or 59, 60 on both sides of the pump, and the pump action is automatically stopped. Therefore, there is no need for a switch linked to the on-off valve 8, long wiring, or a pressure switch, and there is no need for a means to absorb the pulsating changes in paint pressure, such as a pressure accumulator tank, making it very inexpensive. In addition, there is no need for maintenance work to prevent paint from accumulating and coagulating in the paint pressure detection section of the pressure switch or the pressure accumulating tank.

As described above, the present invention combines the roller-type atomizer 1 equipped with the cavity 40 and the pneumatically driven diaphragm-type reciprocating pump 2, thereby making it possible to adapt the roller-type atomizer to a roller-type atomizer, which has not been put to practical use in the past. This technology has made it possible to directly pump paint using a pump extremely economically, and it will make a huge contribution to the painting industry.

Incidentally, the configuration of the roller-type atomizer, especially the configuration of the rotating roller main body 16, including the configuration for forming the void space 40, is not limited to the embodiment. Furthermore, the configuration of the pump 2 is not limited to the embodiment.

[Brief explanation of the drawing]

Fig. 1 is an explanatory diagram of the whole, Fig. 2 is a partial longitudinal sectional front view showing the roller type atomizer, Fig. 3 is a longitudinal sectional view of a portion of the roller main body, and Fig. 4 is A-A in Fig. 2.
5 is a sectional view taken along the line BB in FIG. 2, and FIG. 6 is an explanatory diagram of the structure of the pump. 1...Roller type paint device, 2...Diaphragm type reciprocating pump, 3...Air compressor, 5...Paint tank, 8...Opening/closing valve, 11...Shaft pipe, 16...Rotating roller body, 17 ... Cylindrical paint tool, 29, 42 ... Paint outflow path, 40 ... Vacancy, 46 ... Suction port, 47 ... Discharge port, 50-5
3... Ball valve, 55, 56... Diaphragm.

Claims (1)

[Claims] 1 A pneumatically driven diaphragm type reciprocating pump directly pumps the paint in the paint tank to a roller type paint device without going through a paint pressure pulsation absorption means, and this paint device has a cylindrical paint tool fitted inside. A protrusion is protrudingly provided around the rotating roller main body to abut against the inner surface of the cylindrical coating tool and support the cylindrical coating tool, and between adjacent protrusions, the rotating roller main body and the cylindrical A space is formed between the painting device and the paint pressure pulsation caused by the pump is absorbed by this space, and the paint flow path is opened and closed by an on-off valve provided on the handle of the painting device, and when the path is closed, the paint flow path is A method for pumping paint to a roller-type paint applicator, characterized in that driving air pressure and paint pressure are balanced in both chambers of the diaphragm of the pump, and the pump action is stopped.