JPS587167B2 - Level measurement method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a level measuring method for measuring the rising height of a fluid such as mortar using the propagation characteristics of ultrasonic waves.

For example, when measuring the rising height of mortar in a mortar plant using an ultrasonic transducer, if the ultrasonic transducer is immersed in mortar, mortar will adhere to the ultrasonic transducer. Since the ultrasonic transducer cannot be removed even if it is pulled up into the water above the mortar surface, it has the disadvantage that it affects the propagation characteristics of the ultrasonic waves and causes measurement errors.

In the present invention, a pipe is placed inside a pipe having a slit or a hole, and an ultrasonic transducer is suspended within the inside pipe by a cable, and the ultrasonic wave transmitter/receiver is suspended from the slit between the outside pipe and the inside pipe. The upper surface of the fluid that enters and rises is determined by the level of the reflected wave from the outer pipe, and the cable is wound up so as to keep the ultrasonic transducer above the upper surface of the fluid, and from the amount of winding, the The present invention is characterized by measuring the rising height of a fluid, and its purpose is to obtain a level measuring method that can accurately measure the rising height by isolating an ultrasonic transducer from the fluid.

FIG. 1 is a schematic diagram of a mortar plant showing an example of application of the present invention, in which 1 is an outer frame, 2 is a mortar injection pipe inserted into the outer frame 1, 3 is a mortar injector, and 4 is the outer frame 1. The mortar injected by the mortar injector 3 through the mortar injection pipe 2 enters from the bottom of the outer frame 1, and the upper surface 5 of the mortar rises according to the amount of injected stone.

FIG. 2 is a cross-sectional view showing an example of the measuring device used in the present invention, and 6 is a pipe having a slit or hole 7 formed in the axial direction.

Reference numeral 8 denotes a pipe for isolating the ultrasonic transducer 9 from the mortar, and the pipe 8 is arranged inside the pipe 6.

10 is a cable, 11 is a cable winder, and the ultrasonic transducer 9 is suspended within the pipe 8 by the cable 10.

As shown in FIG. 1, the measuring device configured as described above is installed in advance in the outer frame 1 of the mortar plant, and ultrasonic waves are transmitted horizontally from the transmitting section of the ultrasonic transducer 9. A signal is emitted, and a reflected wave reflected by the outer pipe 6 is received by a wave receiving section.

Next, when mortar is injected by the mortar injector 3 through the mortar injection pipe 2, the mortar penetrates between the outer pipe 6 and the inner pipe 8 through the gap between the stones 4 and the slit or hole 7.

Then, the mortar upper surface 5 rises according to the injection amount, and when this mortar surface 5 reaches the height of the ultrasonic transducer 9,
Since the reflected wave level is reduced by the mortar that has entered between the outer pipe 6 and the inner pipe 8, the cable 10 is now wound to a certain length by the cable winder 11 and the ultrasonic transducer 9 is pulled up onto the upper surface 5 of the mortar.

In this way, the upper surface 5 of the mortar is determined based on the reflected wave level, and the cable 10 is sequentially wound up, and the rising height of the mortar is measured from the amount of winding.

Although not shown, it is preferable that the amount of cable winding be displayed on a counter or the like.

As explained above, the present invention is capable of transmitting and receiving ultrasonic waves by arranging a pipe inside a pipe having a slit or hole and suspending an ultrasonic transducer by a cable inside the pipe. This is a method in which the container is isolated from a fluid such as mortar, and the height of the rise is measured by determining the top surface of the fluid based on the level of the reflected wave from the outside pipe.
There is no mortar etc. attached to the ultrasonic transducer,
Therefore, highly accurate measurements can be performed.

Further, the level measuring method of the present invention can be widely used not only for measuring the level of mortar but also of oil level, liquid level, etc.

[Brief explanation of drawings]

FIG. 1 is a schematic diagram of a mortar plant showing an example of application of the present invention, and FIG. 2 is an enlarged perspective view, partially in section, showing an embodiment of a measuring device used in the present invention. 6...Pipe, 7...Slit or hole, 8...Pipe, 9...Ultrasonic transducer, 10...Cable , 11... Cable winder.

Claims (1)

[Claims] 1. A pipe is placed inside a pipe with a slit or hole, and an ultrasonic transducer is suspended in the inner pipe by a cable, and ultrasonic waves are emitted from the ultrasonic transducer and transmitted to the outer pipe. The reflected wave from the pipe is received, and the upper surface of the fluid that enters between the outer pipe and the inner pipe through the slit or hole and rises is determined based on the reflected wave level, and the upper surface of the fluid is determined. 1. A level determination method, comprising: winding the cable so as to maintain the ultrasonic transducer at a constant position, and determining the rising height of the fluid from the winding amount.