JPH028683Y2 - - Google Patents

Description

[Detailed description of the invention] (Industrial application field) This invention is a grinding fluid circulation system that circulates and reuses the grinding fluid used for lens grinding in a grinding machine for grinding eyeglass lenses. Concerning improvements to tank equipment.

(Prior Art) Today, the mainstream grinding fluid supply method for grinding machines is the circulation type. In this circulation system, the grinding fluid used for lens grinding passes through the drainage system of the grinding machine and is stored in a tank for storing grinding fluid, where the grinding waste is settled and the supernatant grinding fluid is returned to the water supply system. It is supplied to the beading machine through the grinder and used for lens grinding.

With conventional grinding fluid tank equipment, it is difficult to control the amount of grinding debris that has settled, making it difficult to predict when it will be discarded, and machining may continue unnoticed even if the grinding debris in the grinding fluid tank exceeds the allowable limit. This can lead to clogging of the water supply system,
An accident occurred where grinding fluid overflowed from the grinding fluid tank.

(Purpose of the invention) The object of the invention is to eliminate the drawbacks of the conventional circulating grinding fluid supply system, and particularly to improve the draining of the liquid surface of the grinding fluid tank.

(Structure of the invention) The present invention is a grinding fluid tank device used in a circulating grinding fluid supply system that stores the grinding liquid from the grinding machine and supplies the supernatant liquid to the grinding machine side again. An outer tank for storing supernatant grinding fluid and connected to the water supply system of the polishing machine, and a drainage system of the polishing machine comprising an overflow wall and a foam cutter plate in which at least one wall surface is smaller in height than other wall surfaces. and a connected inner tank, the inner tank is floated in the stored grinding fluid in the outer tank, and a liquid level detection means is provided for detecting the liquid level of the stored grinding fluid in the outer tank. This is a grinding fluid tank device for a grinding machine.

(Effect of the invention) According to the invention, the inner tank is floated inside the outer tank, and the grinding fluid is first injected into the inner tank, while the liquid level detection means detects the liquid level of the stored grinding fluid in the outer tank. To detect. As a result, grinding debris accumulates inside the inner tank and the inner tank sinks.
Since the liquid level of the stored grinding fluid in the outer tank increases significantly, the sensitivity for detecting the grinding fluid level increases, and there is an advantage that highly accurate liquid level measurement becomes possible.

(Embodiments) First Embodiment FIG. 1 is a longitudinal sectional view showing a first embodiment of the present invention. The grinding liquid tank device of this embodiment includes an outer tank 51 for storing supernatant liquid and grinding waste 2.
4 and an inner tank 52 for precipitate accumulation. The inner tank 52 is the outer tank 52
It is suspended by the supernatant grinding fluid inside. At the top of the inner tank 52 is arranged an upper lid 13 having a nozzle 14 connected to the drain pipe of the dropper. On the other hand, a nozzle 11 for taking out the grinding fluid is provided at the lower part of the outer tank 51.

A protruding pipe 54 having a through hole 54a is provided on both sides of the inner tank 52.
Guide rod 5 installed in outer tank 51 inside 4a
5 is inserted. This guides the vertical movement of the inner tank. Further, one wall surface of the inner tank 52 is formed as an overflow wall 56 whose height is lower than that of the other wall surfaces, and after the grinding liquid discharged within the inner tank 52 is separated by sedimentation of grinding waste, It overflows the overflow wall 56 and flows into the outer tank 51 where it is stored. Furthermore, a waste bag 53 made of vinyl, for example, is provided in the inner tank 52 for convenience when disposing of grinding waste.
is removably inserted, and grinding waste is deposited and accumulated in this.

The outer tank 51 is provided with a liquid level detection device composed of a float 26, a pointer 27 implanted therein, and a scale plate 28. Scale plate 28
are color-coded into an inner limit area 28b and an outer limit area 28a, with the liquid level corresponding to the limit amount of grinding waste accumulation as a boundary line.

Next, the operation of this embodiment will be explained. The grinding liquid containing grinding waste from the grinding machine is made to flow into the inner tank 52 from the nozzle 14. This grinding liquid is
Once contained in the inner tank 52, the grinding waste is separated by sedimentation, and the supernatant grinding fluid overflows from the overflow wall 53 and is stored in the outer tank.

A part of the stored grinding fluid is supplied from the nozzle 11 to the polishing machine again and used for lens grinding. The grinding fluid is circulated through the above-mentioned path, and grinding waste is gradually deposited and accumulated in the inner tank 52. Due to the accumulation of this grinding waste, the inner tank 52 floating in the grinding fluid stored in the outer tank 51 sometimes sinks, which causes the level of the grinding fluid to rise.
The float 26 of the liquid level detection member rises, and the position of the pointer 27 pointing to the scale plate 28 rises, and the user can know the amount of grinding waste from the pointer indicated position.

The relationship between the amount of accumulated grinding debris and the rising liquid level in this embodiment is as shown in FIGS. 2A and 2B. When the bottom area of the tank is S, the volume of the accumulated grinding waste in the inner tank 52 is V, and its specific gravity is ρ, the liquid level H is given as H=h+ρ·V/S. In the above equation, the grinding fluid was water, its specific gravity was 1, and the amount of the grinding fluid discharged into the grinding fluid tank was equal to the amount of supernatant grinding fluid supplied to the grinding machine.

Second Embodiment FIG. 3 shows a second embodiment in which the liquid level detection means of the first embodiment is displaced. A communication pipe 70 is formed in the outer tank 51, and the oscillation frequency from the oscillator 81 is set at a predetermined height position of the communication pipe, that is, at a supernatant grinding liquid level corresponding to the allowable grinding waste accumulation amount in the inner tank 52. An ultrasonic receiving element 72 is attached to the ultrasonic oscillating element 71 which generates high frequency oscillation in order to receive the ultrasonic waves from the oscillating element 71, which is placed opposite to the element 71.

When the grinding fluid level in the outer tank 51 is at position A, most of the ultrasonic waves from the oscillating element 71 are attenuated by the air in the communication tube, so the receiving element 72 receives a weak reception voltage and does not generate it. However, when the liquid level reaches position B, that is, when the amount of grinding debris reaches its allowable amount as described above, the ultrasonic waves from the oscillation element 71 are almost attenuated by the grinding liquid rising inside the communication pipe 70. The signal is propagated to the receiving element 72 without any interference.

The received voltage from the receiving element 72 is amplified by an amplifier 73 and then compared by a comparison circuit 74 with a predetermined reference voltage level. When the received signal level corresponding to when the liquid level reaches B is input to the comparison circuit 74, the comparison circuit 74 switches to the switching circuit 75.
Outputs the detection signal to. The switching circuit 75 that receives the signal from the comparison circuit 74 activates the voice synthesis circuit 76 and makes an announcement through the speaker 78, for example, "Please throw away the grinding waste in the tank." At the same time, the display signal generation circuit 7
7 is activated to display "Kensaku Kuzuhaki" on the display 79 of the beading machine 80, for example, a liquid crystal display.

Third Embodiment FIGS. 4, 5A and 5B show a grinding fluid tank device which is a third embodiment of the present invention and is capable of detecting an absolute shortage of water in the grinding tank. Components that are the same or equivalent to those of the first and second embodiments described above are given the same reference numerals, and descriptions of those elements will be omitted in the following description of this embodiment.

A switch lever 102 of a limit switch 101 mounted on an upper lid 13 is rotatably attached to the upper end of a float 100 floating in the supernatant grinding fluid in the outer tank 51. With this configuration, as shown in FIG. 6A, when the grinding waste in the inner tank 52 reaches a predetermined amount, the float 100 rises, turning on the upper limit switch of the limit switch 101, and switching circuit 75 of the third embodiment.
The following circuit is activated to notify the operator that it is time to dispose of the grinding waste.

The relative water level difference Δh in this embodiment is given as Δh=(ρ−1)V/S. Here, S represents the bottom area of the outer tank, V represents the volume of accumulated grinding debris, and ρ represents its specific gravity. In this embodiment, when the absolute amount of grinding water in the outer tank 51 decreases, the water level decreases, and the float 100 switches the lower limit switch of the limit switch 101 as shown in FIG. 5B.
It is turned on and the operator is notified of this by a known alarm circuit (not shown).

[Brief explanation of the drawing]

FIG. 1 is a longitudinal cross-sectional view showing a first embodiment of a grinding fluid tank for a grinding machine according to the present invention, FIG. 2A,
Fig. 2B is a horizontal diagram showing grinding debris accumulation and changes in liquid level in the first embodiment, Fig. 3 is a block diagram showing another embodiment of the liquid level detection means, and Fig. 4 is a diagram showing the third embodiment. The longitudinal cross-sectional views shown in FIGS. 5A and 5B are as follows:
It is a schematic diagram showing the effect. DESCRIPTION OF SYMBOLS 10... Tank, 11, 14... Nozzle, 26... Float, 27... Pointer, 28... Scale plate, 51... Outer tank, 52... Inner tank.

Claims (1)

[Scope of Claim for Utility Model Registration] (1) A grinding fluid tank device used in a circulating grinding fluid supply system that stores the grinding fluid from the grinding machine and supplies the supernatant liquid to the grinding machine again. , an outer tank for storing the supernatant grinding fluid and connected to the water supply system of the grinding machine, and an overflow wall and a foam cutter plate with at least one wall surface having a height smaller than that of the other wall surfaces, and a draining surface of the grinding machine. an inner tank connected to the system, the inner tank floating within the stored grinding fluid of the outer tank;
A grinding fluid tank device for a grinding machine, further comprising a liquid level detection means for detecting the liquid level of the stored grinding fluid in the outer tank. (2) The utility model registration request is characterized in that the liquid level detection means is composed of a float floated by stored grinding fluid, a pointer provided on the float, and a scale plate pointed by the pointer. A grinding fluid tank device for a grinding machine as described in scope item (1). (3) The liquid level detection means includes a communication pipe provided in the outer tank, an ultrasonic transmitting element provided at a predetermined height of the communicating pipe, and a communicating pipe connected to the ultrasonic transmitting element. Utility model registration claim (1) characterized in that the ultrasonic wave receiving element is comprised of an ultrasonic wave receiving element disposed opposite to each other via the ultrasonic wave receiving element, and a detection and notification means that is activated in accordance with the output of the ultrasonic wave receiving element. Or the grinding fluid tank for a grinding machine according to any of paragraph (2). (4) The polishing machine according to any one of claims (2) to (3) of the utility model registration claim, wherein the inner tank has a removable bag for storing grinding waste. Grinding fluid tank device for use.