JP2552067Y2 - Sludge interface depth measuring device - Google Patents

Description

[Detailed description of the invention]

[0001]

The present invention relates to a sludge interface depth measuring device,
In particular, the present invention relates to switching of a recording range of a pen recorder for depth recording.

[0002]

2. Description of the Related Art In a sludge treatment tank for separating a liquid to be treated containing sludge into a sludge and a supernatant by a sedimentation separation method, an interface between the sludge and the liquid, which changes with time due to sedimentation,
It is necessary to know the depth of the so-called sludge interface from the liquid surface, and to know the sludge discharge timing and the like. Therefore, a sludge interface depth measuring device using ultrasonic waves has been conventionally used as one of the means. In this apparatus, as shown in FIG. 3, an ultrasonic transducer (3) is immersed and fixed near a liquid surface (2) to be treated in a sludge treatment tank (1). Transmit a sound pulse. Then, a depth signal whose level changes in accordance with the depth from the time difference between the transmission signal and the sludge interface (4) based on the transmission signal, that is, the reception signal is obtained and processed, and this is synchronized with the transmission signal. In addition to the CRT display device (6) that is swept, the change in the depth H of the sludge interface (4) with respect to the liquid surface (2) is displayed as shown in FIG. Further, in order to enable observation of a change in the depth of the sludge interface (4) over a long period of time and to meet a demand for data storage, an external output terminal (7) for depth data is provided in the measuring device main body (5). If necessary, a pen recorder (8) ((8a) is a recording pen, and (8b) is a recording paper) is connected here, and thereby a depth recording (8c) as shown in FIG.
Getting it done is done.

[0003] Incidentally, the depth of the sludge treatment tank (1) is set to 8 m, 5 m, or 5 m corresponding to the treatment amount as shown by a dotted line in FIG.
There are various things like 3m. On the other hand, when displaying or recording with a CRT display device or pen recorder, it is necessary to use the display screen and recording width as effectively as possible in order to easily and accurately grasp the depth. Therefore, in the cathode ray tube display device (6), an arbitrary display range can be selected at intervals of, for example, 1 m in correspondence with the depth of the sludge treatment tank, and when the depth of the treatment tank (1) is at least 3 m, for example. As shown in FIG. 4 (a), the screen is fully used for display, and when the processing tank (1) has a maximum depth of 5 m, the display cycle to the CRT display device (6) is 5 m. As shown in FIG. 4B, the display can be performed by effectively using the screen.

[0004]

However, the output signal from the external output terminal (7) of the measuring device body (5) is an analog signal having a level proportional to the depth, and the pen recorder (8) is generally a CRT. It does not have a function of selecting a fine display range as in the display device (6). Therefore, for example, when the depth of the sludge treatment tank (1) is 5 m, a current that can be swung over the full recording width of the recording paper (8b) as shown in FIG. When a pen recorder is selected and used as described above, if the depth of the sludge treatment tank (1) becomes, for example, 3 m, the amplitude of the recording pen becomes, for example, as shown in FIG.
As shown in (b), it is 3/5, and the recording width cannot be used effectively. Therefore, there is a problem to be solved in which the behavior of the sludge interface (4) becomes inaccurate.

[0005]

The purpose of the present invention is to provide means for recording the sludge interface depth by effectively using the recording width even when recording with a pen recorder.

[0006]

The object of the present invention is attained by means described below with reference to FIG. That digital display Renjide data signal acquisition circuit (9), namely a cathode ray tube display device of the measuring device main body (6) and digital display range data signal acquisition circuit for detecting the switching state of the display range of the digital depth signal acquisition circuit (10) That is, the digital serial signal of the measurement depth from the external output terminal (7) is
A circuit for Dan storing, operation circuit (11), i.e. as an input the output of the digital display range data signal acquisition circuit (9) and a digital depth signal acquisition circuit (10), switching of the display range of the cathode ray tube display device (6) Sludge treatment tank corresponding to condition
At the depth of (1), the record of the pen recorder (8) is recorded.
Measure the recording depth so that it becomes the maximum recording width of the recording paper (8b).
A circuit for calculating a current value corresponding to the analog signal to digital operation output of the arithmetic circuit (11)
A digital-analog converter circuit (12) for converting into items, current conversion circuit (13), i.e. it is controlled by the output signal of the digital-analog converter circuit (12) and a circuit for supplying a current to the pen recorder (8) The above-mentioned object is achieved by providing the recording range setting circuit (B) provided in the sludge interface measuring device (A) including the transducer (3), the measuring device main body (5), the CRT display device (6), and the like. Is what you do.

[0007]

As described above, when the digital-to-analog conversion circuit (12) has, for example, an 8-bit configuration, the arithmetic circuit (for example, when the display range of the cathode ray tube display device is 5 m) is interlocked with the display range setting. From (11), (depth) × (256/5) is input to a digital / analog conversion circuit (12), and when the display range is switched to 3 m, (depth) × (256/3) is converted to a digital / analog conversion circuit. Input (12). When the output analog signal is input to the current conversion circuit (13), the recording range of the pen recorder (8) is switched in conjunction with the switching of the display range of the CRT display device (6) to always use the recording paper width effectively. Recording. Next, an embodiment of the present invention will be described.

[0008]

FIG. 2 is a circuit diagram of an embodiment of the present invention. FIG.
In (3), an ultrasonic transducer is used, and in this example, a case where a transmitter (31) and a receiver (32) are used is shown. (101) is a transmitter, (102) is a receiver, (10)
3) is a gain control circuit of the receiver, which controls the output level of the receiver (102) to be always constant. (10
4) is an analog / digital conversion circuit, which forms a transmission / reception unit. (105) is a ROM, (106)
Is a CPU, which performs overall control and various calculations based on a program stored in the ROM (105) in advance.
Next, (107) is a display range switching circuit, (108) is a RAM for storing data, (109) is a timing pulse generation timer for generating a transmission pulse, and (110) is the RAM.
(108) is a data storage timing pulse generation timer, and (111) is an interrupt controller. In the above circuit, the timing pulse generation timer (109) for generating the transmission pulse is provided by the interrupt controller (11).
1) An interrupt is made at regular intervals, and the CPU
(106) sends a control pulse to the transmitter (101). And thereby, the transmitter (31) transmits an ultrasonic pulse toward the sludge interface (4). The receiver (32) receives the reflected wave, and the receiver (102) converts the received signal into an analog signal.
It is input to a digital conversion circuit (104), where it is digitized. The timing pulse generation timer (109) for generating a transmission pulse is a timing pulse synchronized with the timing pulse generation timer (110) for storing data.
An interrupt is issued to the interrupt controller (111).
Then, the CPU (106) takes in the output signal data from the analog / digital conversion circuit (104) and stores it in the RAM (108) at every fixed period timing pulse.
The data capture timing cycle is determined by the range in which the cathode ray tube display device (6) displays the depth direction and the number of display pixels. Therefore, the display range can be changed by changing the data fetch timing cycle according to a command from the display range switching circuit (107). Next, (112) is a video RAM, and (113) is the RAM.
(108) The read / write control circuit, wherein the RAM
The data of (108) is transferred to the video RAM (112) during the blanking period of the cathode ray tube display (6),
It is written in a one-to-one correspondence with the display screen, and is read out and displayed. (114) is a serial data converter,
(7) is an external output terminal. The CPU (106) calculates the depth of the sludge interface (4) for each transmission from the data stored in the video RAM ( 112 ), and outputs the digital depth signal to the external output terminal (7) by the serial data converter ( 114 ). Send out. Thus, the conventional sludge interface measuring device (A) is formed. Next, (B) is a recording range switching circuit of the pen recorder of the present invention, of which (9) is a digital display range data signal obtaining circuit, (10) is a digital depth signal obtaining circuit, and (11) is an arithmetic circuit. , (12) is a digital / analog conversion circuit, and (13) is a current conversion circuit. (8) is a pen recorder, and the recording range switching circuit (B) operates as described above, and performs recording using the full recording width in conjunction with switching of the display range of the CRT display device (6). Control the current of the pen recorder (8).

[0009]

[Effects of the Invention] As is apparent from the above description, according to the present invention, the liquid level at the sludge interface is always applied to the pen recorder by fully using the effective width of the recording paper corresponding to the depth of the sludge treatment tank. The depth of the sludge can be easily recorded because the depth can be recorded.

[Brief description of the drawings]

FIG. 1 is an explanatory view of the present invention.

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

FIG. 3 is an explanatory view of a conventional sludge interface measuring device.

FIG. 4 is an explanatory diagram of a display example by a CRT display device.

FIG. 5 is an explanatory diagram of a display example by a pen recorder.

[Explanation of symbols]

(1) Sludge treatment tank (2) Liquid surface to be treated (3) Ultrasonic wave transmission / reception 1 (31) Ultrasonic wave transmitter (32) Ultrasonic wave receiver (4) Sludge interface (5) Measurement device body (6) ) CRT display device (7) External output terminal (8) Pen recorder (8a) Recording pen (8b) Recording paper (9) Display range data signal attachment circuit (10) Digital depth signal attachment circuit (11) Arithmetic circuit (12) Digital-to-analog converter (13) Current converter (101) Transmitter (102) Receiver (103) Receiver gain control circuit (104) Analog-to-digital converter (105) ROM (106) CPU (107) Display Range switching circuit (108) RAM for data storage (109) Timing pulse generation timer for transmission pulse generation (110) Timing pulse for data storage Raw timer (111) the interrupt controller (112) reads the write circuit (114) of the video RAM (113) RAM (108) serial data converter (A) sludge interface measurement apparatus (B) record range switching circuit

Claims (1)

(57) [Scope of request for utility model registration] 1. An ultrasonic wave transmitter / receiver is positioned on a liquid surface to be treated in a sludge treatment tank to transmit ultrasonic waves toward a sludge interface, and a received signal which is a reflected wave based on the transmitted signal is transmitted. causes display on the cathode ray tube display apparatus that can change the display range corresponding to the depth of the sludge treatment tank, the depth output of the sludge interface obtained from said transmitting signal and received signal to an external output terminal In a sludge interface depth measuring device which is capable of transmitting and recording by a pen recorder, a switching state of a display range of the CRT display device is detected.
A digital display range data signal acquisition circuit, and a digital serial signal of a measurement depth from the external output terminal.
A digital depth signal obtaining circuit for temporarily storing a signal, an output of the digital display range data signal obtaining circuit and an output of the digital depth signal obtaining circuit being input, and corresponding to a switching state of a display range of the CRT display device. The said dirty
At the depth of the mud treatment tank, the record of the pen recorder is recorded.
Make sure that the maximum recording width of the recording paper is
An arithmetic circuit for calculating a current value that, to convert the digital arithmetic output of the arithmetic circuit into an analog signal
A digital-analog converter circuit that, the control of the output signal of the digital-analog converter circuit
It is by Bei the current converter circuit for supplying a current to the pen recorder
Sludge interface depth measuring device, characterized in that was e.