JPS629963Y2 - - Google Patents

Description

[Detailed description of the invention] The present invention is a powder that is assembled to the lower part of a hopper that stores powder coating material and is used for feeding the powder coating material in the hopper into a wheel feed pipe in an air wheel feeding device, for example. The present invention relates to a body paint supply device.

Conventionally, as a method of supplying powder and granules from a low-pressure part (atmospheric side) to a high-pressure part (ejector side), devices such as ball valves and dampers are installed in the said part in double, and by their alternate operation, powder particles are supplied to the high-pressure part. There was a way to supply the body.

When powder coatings were supplied using these devices, the following problems arose.

(a) Ball valve type There is a sliding part, and the paint that enters this part undergoes a reaction due to mechanical contact during operation, and when it is sprayed onto the object to be painted, it removes paint defects such as spots on the painted surface. arise upwards.

(b) Damper type Paint enters into the part where the damper operates, causing problems such as those mentioned above in terms of paint quality.Ultimately, the hardening of the paint that enters causes malfunction, and the pressure sealing performance is poor, resulting in high pressure (5. ~7Kg/cm ² ) causes problems such as air leakage from the damper operating part and a decrease in the amount of paint falling from the hopper.

The present invention was made to solve this problem, and one embodiment of the invention will be described below with reference to the drawings. In FIG. 1, a supply device 20 according to the present invention is located at the bottom of a hopper 10 that stores powder coating material.
is assembled. The hopper 10 is an open type hopper with a simple structure, and a lid 11 is placed on the upper opening.

As shown in an enlarged view in FIG. 2, the supply device 20 includes a first pinch valve 21 that is airtightly and removably fixed to the lower end annular flange 10a of the hopper 10 via an annular packing 31; A relay tank 22 is airtightly and removably fixed to the lower end annular flange 21a of the pinch valve 21 via annular gaskets 32, 33 and an annular plate 34.
and the lower end annular flange 22 of this relay tank 22.
a second pinch valve 23 airtightly and removably fixed to a via an annular packing 35;
The ejector 24 is airtightly and removably fixed to the lower annular flange 23a of the pinch valve 23 via an annular packing 36. The first pinch valve 21 includes a pair of upper and lower annular flanges 21a and 21b, and each of these flanges 21
A pair of upper and lower tubes 21c and 21d airtightly fixed to the tubes 21c and 21b, respectively, and both tubes 21c,
Flexible tube 21 whose upper and lower ends are airtightly fixed to 21d
e, and an outer cylinder 21f arranged around the outer periphery of the flexible tube 21e and hermetically fixed both upper and lower ends to both the tube bodies 21c and 21d, and a first electromagnetic valve SL ₁ is installed on the side of the outer cylinder 21f. A port 21g is provided which is connected to an air source 40 via the air source 40. The relay tank 22 consists of a pair of upper and lower annular flanges 22a and 22b, and a funnel-shaped main body 22c whose upper and lower ends are hermetically fixed to these flanges 22a and 22b.
An air source 40 is connected to the upper part of the unit via the second solenoid valve _SL2 .
A port 22d connected to is provided. Second
Since the pinch valve 23 has the same structure as the first pinch valve 21, it is given a similar reference numeral and a description thereof will be omitted, but its port 23g is connected to the air source ₄₀ via the third solenoid valve SL3. The ejector 24 is a known one, and includes an inlet 24a that communicates with the lower end opening of the second pinch valve 23, an outlet 24b that airtightly connects a transfer tube P in a powder coating air transfer device, and an air supply port. 24c, and the air supply port 24c is connected to the air source 40 via a shuttle valve 41 and a fourth solenoid valve SL ₄ and a fifth solenoid valve SL ₅ connected in parallel.

The above-mentioned solenoid valves SL ₁ to _{SL 5} are controlled to be activated (ON) or deactivated (OFF) by the control device 50 as shown in FIG. In the control device 50, a main switch (not shown) is connected.
While it is turned ON, a continuous signal is sent to the fourth solenoid valve SL ₄ , and T ₁ hour (0.1 to 0.5
seconds) T to the first solenoid valve SL ₁ with a delay _{of 2} hours (4 to 6 seconds)
A pulse signal of T 2 is sent to the second solenoid valve SL ₂ and the third solenoid valve SL ₃ with a delay of T ₁ hour after this pulse signal _.
A pulse signal of time T ₂ hours is sent to the first solenoid valve SL ₁ after a delay of T ₁ hours after this pulse signal. This pulse signal transmission to the first to third solenoid valves is performed while the main switch is ON, and as shown in FIG _.
If the main switch is turned off within ₁ hour after the pulse signal is sent to the third solenoid valve SL ₃ , the fourth solenoid valve
The signal to SL ₄ is cut off, and at the same time, a pulse signal is sent to the fifth solenoid valve SL ₅ for T ₃ hours (this time is longer than T ₁ + T ₂ depending on the length of the circular feed pipe P and the type of powder coating to be conveyed). (depending on the destination) is sent repeatedly. Furthermore, if the main switch is turned off while a pulse signal is being sent to the first solenoid valve SL ₁ , the signal to the fourth solenoid valve SL ₄ is cut off as described above, and at the same time, the signal to the fifth solenoid valve SL is cut off. While a pulse signal is sent to ₅ , the first solenoid valve
The pulse signal to SL ₁ is immediately cut off, and then after a delay of T ₁ hour, the pulse signal to the second solenoid valve SL ₂ and the third solenoid valve SL ₃ is turned off by T ₂
A time pulse signal is sent. Furthermore, the first solenoid valve
If the main switch is turned off within T ₁ hour after the pulse signal to SL ₁ , the fourth solenoid valve SL ₄ will be turned off as described above.
At the same time, a pulse signal is sent to the fifth solenoid valve SL ₅ , and at the same time, a delay of T ₁ hour after the pulse signal to the first solenoid valve SL ₁ is sent to the second solenoid valve SL ₂ and the third solenoid valve SL. ₃ , a pulse signal of T ₂ hours is sent.
Furthermore, if the main switch is turned off while a pulse signal is being sent to the second solenoid valve SL ₂ and the third solenoid valve SL ₃ , the fourth solenoid valve SL ₄ is turned off as described above.
At the same time, a pulse signal is sent to the fifth solenoid valve SL ₅ , and a pulse signal for T ₂ hours is sent to the second solenoid valve SL ₂ and the third solenoid valve SL ₃ without interruption. Ru.

In this embodiment configured as described above, before the main switch is turned on, all of the solenoid valves SL ₁ to _{SL 5} are OFF as shown in FIG. 2, and the air from the air source 40 is It is supplied to the pinch valve 21 and the second pinch valve 23, and both pinch valves 21 and 23 are closed. By the way, when the main switch is turned on, the fourth solenoid valve SL ₄ turns on and starts supplying air to the ejector 24, and after T ₁ hour, the first solenoid valve SL ₁ turns on and the first
Air is discharged from the pinch valve 21 and the first pinch valve 21 opens, and the powder paint in the hopper 10 falls by its own weight through the first pinch valve 21 into the relay tank 22, and after T ₂ hours, the first electromagnetic valve
SL ₁ is turned off, air is supplied to the first pinch valve 21, the first pinch valve 21 is closed, and the falling of the powder paint into the relay tank 22 is interrupted. after that
After T ₁ hour has passed, both solenoid valves SL ₂ and SL ₃ are turned on, air is supplied into the relay tank 22, and at the same time air is discharged from the second pinch valve 23 and the second
The pinch valve 23 opens, and the powder paint in the relay tank 22 is transferred to the ejector 2 by its own weight and air.
4, and is further pressure-fed by the ejector 24 into the circular feed pipe P, where it is air-fed. After T ₂ hours have passed, both solenoid valves SL ₂ and SL ₃ are turned OFF, and the air supply to the relay tank 22 is cut off. At the same time, air is supplied to the second pinch valve 23 and the second pinch valve 23 is turned off.
The pinch valve 23 closes and the pumping of powder coating material to the ejector 24 is interrupted. After that, after _T1 hours have elapsed, the first solenoid valve _SL1 is turned on again, and the above-described operation is repeated. This operation is repeated until the main switch is turned off, during which time the powder paint is continuously fed by air. However,
As shown in Figure 3, when the main switch is turned off immediately after both solenoid valves SL ₂ and SL ₃ are turned off, the fourth solenoid valve SL ₄ is immediately turned off and at the same time the fifth solenoid valve is turned off.
Solenoid valve SL ₅ turns ON. After that, the fifth solenoid valve SL ₅
T Turns on intermittently for ₃ hours to clean the inside of the ejector 24 and wheel feed pipe P with air. Note that when the main switch is turned OFF when the first solenoid valve SL ₁ is ON, the first solenoid valve SL ₁ and the fourth solenoid valve SL ₄ are immediately turned OFF, and at the same time, the fifth solenoid valve SL ₅ is turned ON.
After that, after T ₁ hour has passed, both solenoid valves SL ₂ and SL ₃ are closed.
ON, the powder paint in the relay tank 22 is force-fed to the ejector 24, and further air-fed by the air supplied to the ejector 24 by the intermittent operation of the fifth solenoid valve _SL5 . After T ₂ hours have elapsed, both solenoid valves SL ₂ and SL ₃ are turned off, and thereafter the ejector 24 and the wheel feed pipe P are turned off by air supplied through the fifth solenoid valve SL ₅ which is turned on intermittently.
The inside will be cleaned. Connect the main switch to the first solenoid valve
Operation when turned OFF within T ₁ hour after a pulse signal is sent to SL ₁ , and when the main switch is turned OFF while a pulse signal is being sent to the second solenoid valve SL ₂ and the third solenoid valve SL ₃ . Since the operation is likely to be easily understood from the above-described operation and the above-described configuration, the explanation thereof will be omitted.

In addition, in the above embodiment, the relay tank 22
A port 22d is provided in the second pinch valve 23.
When the relay tank 22 is open, air flows from the top to the bottom in the relay tank 22, and powder coating is supplied to the ejector 24 very efficiently.However, when implementing this invention, a port is provided in the relay tank. Even if the second pinch valve 23 is opened, air flows back from the ejector 24 to the relay tank, and the powder paint in the relay tank is suspended in this air so that it can easily fall, so the powder paint loses its own weight. It is well supplied to the ejector 24 by this.

In summary, in the present invention, the upper end opening of the relay tank is airtightly connected to the lower end opening of the hopper for storing powder paint through the first pinch valve, and the lower end opening of the relay tank is connected to the lower end opening of the relay tank. Connect the ejector airtightly via a pinch valve,
Since the first pinch valve and the second pinch valve are configured to be operated alternately when the ejector is operated, the powder coating does not stay in a specific part, and the structure is simple and does not have rotating parts. Because there is no paint entrainment and no deterioration,
The conventional problems described in the header do not occur, and the powder coating material can be successfully supplied to wheel feed pipes and the like. Also,
In this invention, since it is configured as described above,
An inexpensive open type hopper can be used as the hopper.

[Brief explanation of the drawing]

Figure 1 is a side view showing one embodiment of the present invention;
The figure is a control circuit diagram including an enlarged longitudinal section of the supply device according to the present invention shown in FIG. 1, and FIG. 3 is an explanatory diagram of the operation of the solenoid valve shown in FIG. 2. Explanation of symbols 10...Hopper, 20...Powder coating supply device, 21...First pinch valve, 22
... Relay tank, 23 ... Second pinch valve, 2
4... Executor.

Claims (1)

[Scope of utility model registration request] The upper end opening of the relay tank is airtightly connected to the lower end opening of the hopper that stores the powder paint via a first pinch valve, and the ejector is airtightly connected to the lower end opening of this relay tank via a second pinch valve. and a powder coating supply device configured to alternately operate the first pinch valve and the second pinch valve when the ejector is operated.