JP2604389Y2 - Foam layer detection device of defoaming device - Google Patents

Description

[Detailed description of the invention]

[0001]

The present invention relates to a foaming liquid coolant used for a machine tool or a foam layer formed on a liquid surface of a tank used for other general foaming liquids, which affects the vertical fluctuation of the liquid level. And automatically controls the operation of the defoaming device for the foam layer.

[0002]

2. Description of the Related Art As a method of detecting a foam layer by a sensor following a vertical fluctuation of a tank liquid level, a system shown in FIG. 3 has been used conventionally. This is the sensor 2
2 follows the liquid level 23 and detects the foam layer 24 on the liquid level. To follow the liquid level of the sensor 22, a servo mechanism 28 including a dog 25, a proximity switch 26, and a chain device 27 is used. Due to the 29 operations, the scale was large and expensive, and could not be applied to individual machines.

[0003]

SUMMARY OF THE INVENTION A foam layer floating on a liquid surface is detected following the vertical fluctuation of the liquid surface, and the operation of the defoaming device is controlled by the presence or absence of the foam layer. That is, when foam is generated, the defoaming device is operated, and when the foam layer is processed and disappears, the operation of the defoaming device is immediately stopped. Such energy saving, prevention of waste of money,
He expected the emergence of devices that were inexpensive and simple and could be installed on the tanks of individual machines.

[0004]

DISCLOSURE OF THE INVENTION The present invention has been made to solve the above-mentioned problem, and has been made in an apparatus for defoaming a foam layer generated on a liquid surface of a tank used for a foaming liquid. For the layer, a pressure type liquid level detection sensor is provided below the liquid level, and a photometric type liquid level sensor that reflects on the liquid level is reflected by the foam layer or liquid level. It is a foam layer detection device of a defoaming device that detects the foam layer without influence.

[0005]

Pressure type liquid level under the liquid surface [created for Tank sensor P ₁
The provided, the optical length measuring type liquid level sensor P ₂ provided on the liquid surface, a view illustrative of a length between both sensors and the L _T in FIG. L this by depth from the liquid surface to a pressure type liquid level sensor P _1
1, the thickness G of the foam layer on Mataeki surface, from foam layer top surface until long type liquid level sensor P ₂ photometric height and L _2. Now liquid level fluctuates, _{if L 1} is the _{L IH} next _{L 2} from _{L 1L} turned from _{L 2L} to _{L 2H, L T} holds is always constant for the following equation _{L T = L 1L + L 2L} + G _{L = L 1H + L 2H +} G H G L = L T -L 1L -L 2L G H = L T -L 1H
A _{-L 2H G = L T -L 1} -L 2. Thus the liquid level, and the thickness G of the foam layer is changed when it becomes a _{G L} to _{G H,} the _P 1, the calculation of _{P 2} Ryoekii sensor including the change of L 1, _{L 2,} said foam The thickness or presence or absence of the layer can be determined independently of the liquid level.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment in which the foam layer detecting device of the present invention is used in a suction type processing device for a foaming coolant will be described with reference to FIG. On the liquid surface of the foaming cooling liquid tank 1, fine chips are adhered to the outer periphery of the foam layer 2 and the suction layer 4 is provided with a float 3 that always follows the vertical fluctuation of the liquid surface. The foam layer 2 is sucked by the vacuum 5 in the apparatus, gas-liquid separated by the cyclone 6, the separated liquid dropped is separated into solid and liquid by filtration with the mesh filter 7, and this separated liquid is then magnetically separated. returned to the clean tank 9 through a vessel 8, circulate in the suction type processing apparatus to be used, a pressure type liquid level sensor P ₁ the thickness of the foam layer under the liquid surface of the tank can be sufficiently neglected, the liquid level on the foam layer without contact, or photometric reflected by the liquid surface length type liquid level a sensor P _2. A control box 10 containing these control devices is attached to the tank 1.

Therefore, LT between the sensors P ₁ and P ₂ is defined as _LT ,
If L ₁ a depth of up to P ₁ from the liquid _surface, G the thickness of the foam layer of the liquid surface, the height from the foam layer until sensor P ₂ was L _2, (in Fig. 1 (A ) (B) (C) see) the liquid surface is fluctuated, _{L 1} is _{L IH} changed from _{L 1L,} also _{L 2} is changed from _{L 2L} to _{L 2H, L T} is always following expression for the constant It holds _{L T = L 1L + L 2L} + G L = L 1H + L 2H + G H G L = L T -L 1L -L 2L G H = L T -L 1H -
L _2H G = = 0 where _{G L T -L 1 -L 2 L} T = L
The ₁ + _{L 2.} Therefore, when the liquid level and the thickness G of the foam layer change from _GL to _GH , or when G is 0, L ₁ ,
By calculating both the P ₁ and P ₂ liquid level sensors including the change in L ₂ , the thickness or presence or absence of the foam layer can be determined regardless of the liquid level. As another embodiment, as shown in FIG. 2, the sensors P ₁ and P _{2 respectively determine} L ₁ and L ₂ according to the thickness G of the foam layer.
And the operation of the defoaming device can be controlled until G or a certain thickness or by a timer for a certain period of time.

[0009]

According to the foam layer detecting device of the defoaming device of the present invention, the detection of the foam layer is performed in accordance with the vertical fluctuation of the liquid level, and the operation of the defoaming device is controlled. It can be used and operated with confidence in a machine tool that uses a foaming liquid, or other general industries related to the liquid. Since the present foam layer detection device is compact and more inexpensive, it can be installed on a separate machine and can be appropriately operated.

[Brief description of the drawings]

FIG. 1 is an explanatory view showing a state in which a foam layer detecting device of an antifoaming device according to an embodiment of the present invention is applied to a suction type processing device, wherein (A) and (B) in the drawing each show the thickness of a foam layer 2; FIG. 7C shows the state when G changes, and FIG. 7C shows the state when the thickness G = 0.

FIG. 2 is an explanatory view of another embodiment of the present invention.

FIG. 3 is an explanatory view of an example of a conventional foam layer detection device.

[Explanation of symbols]

1. Coolant tank 10. Control box 2. Foam layer 11. Defoaming device 4. Suction port P. _1. Pressure type liquid level detection sensor 6. Cyclone P _2. Photometric liquid Position sensor 7, mesh filter 26, proximity switch 8, magnetic separator 28, saver mechanism 9, clean tank 29, servo motor

Continuation of the front page (58) Field surveyed (Int.Cl. ⁷ , DB name) B01D 19/02 G01F 23/14 G01F 23/28

Claims (1)

(57) [Scope of request for utility model registration] 1. A defoaming device for a foam layer generated on a liquid surface of a tank used for a foaming liquid, wherein a pressure type liquid level detection sensor is provided below the liquid surface, and a foam layer or A foam layer detecting device of a defoaming device, comprising a photometric type liquid level sensor that reflects light from a liquid surface, and detects the foam layer without being affected by vertical fluctuations of the liquid surface by calculation in combination with the sensor.