CN202350808U - Automatic counting device of flowmeter - Google Patents

Abstract

The utility model discloses an automatic counting device for a flowmeter, which comprises a counting wheel, a photoelectric sensor and a signal processing circuit, and is characterized in that the transmitting end of the photoelectric sensor sends a signal to the receiving end of the photoelectric sensor to receive, and the photoelectric sensor connects the signal In the processing circuit, a light-transmitting hole for transmitting signals is opened on the counting wheel. The utility model does not need to count synchronously with the digital wheel of the mechanical counter, so it does not need to work continuously for a long time, and only works when the meter is powered on to directly read the reading pointed by the digital wheel of the mechanical counter, which greatly improves the stability of the remote transmission system sex and reliability.

Description

An automatic counting device for a flow meter

technical field

The utility model relates to a device for reading counts on a mechanical counting water/electricity/air flow meter, in particular to an automatic counting device for a flow meter. the

Background technique

Usually, the structure of long-distance transmission water, electricity, and gas meters is to place a magnet or a reflective film on a certain gear of the watch. When the gear rotates, it triggers a reed switch (Hall element) or a photoelectric switch. Generate a pulse signal, and the remote computer must continuously receive these pulse signals for counting, so as to convert them into the flow rate of water, electricity, and gas. This process cannot be interrupted within 6-8 years of the life of the meter, otherwise it will cause The electronic and mechanical readings are not synchronized; therefore, the use of this structure requires high system stability, the system must work stably and continuously, and the power supply must not be interrupted. Interruption or failure of the system or power supply will cause inconsistencies between the remote electronic readings and the mechanical operation readings, resulting in inaccurate water, electricity, and gas volumes converted from remote electrical signals. the

Contents of the invention

The purpose of this utility model is to provide an automatic counting device for a flow meter. The device does not need to count synchronously with the mechanical counter, and only when the flow is counted regularly, the electronic components work and the counting on the meter is accurately read. the

In order to achieve the above purpose, the following technical solutions are adopted:

An automatic counting device for a flowmeter, comprising a counting digital wheel, a photoelectric sensor, and a signal processing circuit, characterized in that the transmitting end of the photoelectric sensor sends a signal to the receiving end of the photoelectric sensor to receive, the photoelectric sensor is connected to the signal processing circuit, and the counting number There are light-transmitting holes on the wheel for transmitting signals.

The light-transmitting holes are four fan-shaped holes, and the fan-shaped holes correspond to four non-adjacent number areas on the counting wheel. the

There are 4 photoelectric sensors, the photoelectric sensors are respectively corresponding to the four light transmission holes, and the photoelectric sensors are fixed. the

The signal processing circuit is composed of a single-chip microcomputer U1 and a multi-way switch U2, and the signal received by the photoelectric sensor is transmitted to the single-chip microcomputer U1 through the multi-way switch U2. the

The photoelectric sensor is an infrared pair tube photoelectric sensor. the

Compared with the prior art, the automatic counting device of the flow meter has the following advantages:

(1) The readings of water, electricity and gas meters only rely on the original mechanical character wheel to count and maintain, and the electronic components do not need to count and save data synchronously with the mechanical character wheel, so it does not need to work continuously for a long time, and only power on when reading the meter The work directly reads the reading pointed by the mechanical character wheel, which greatly improves the stability and reliability of the remote transmission system;

(2) The non-contact photoelectric detection counting signal will not cause mechanical wear;

(3) Solve the problem of reading in the intermediate state from the darkest to the transparent position to ensure the accuracy of the reading.

Description of drawings

Figure 1 is a schematic diagram of the position of the light transmission hole of an embodiment of the utility model. the

Fig. 2 is a schematic diagram of distribution of photoelectric sensors according to an embodiment of the utility model. the

Fig. 3 is a signal processing circuit diagram of the utility model. the

Detailed ways

Below in conjunction with accompanying drawing and embodiment the utility model is described further. the

As shown in Figures 1 and 2, there are four light-transmitting holes 3 on the counting wheel 1 of the flowmeter, and the light-transmitting holes 3 correspond to four non-adjacent digital areas on the counting wheel 1. 4 photoelectric sensors 2 correspond to the 4 light transmission holes 3 respectively, and the photoelectric sensors 2 are fixed and do not rotate with the counting wheel 1 . the

The transmitting end of the photoelectric sensor 2 sends out a signal. If the signal passes through the light-transmitting hole 3 and the receiving end of the photoelectric sensor 2 receives the signal, it is marked as a high level "1", otherwise it is marked as a low level "0". Because the light-transmitting hole 3 is four fan-shaped holes, with the rotation of the counting wheel 1, the signal received by the receiving end of the photoelectric sensor will have high and low voltages. The distribution of the four sensors makes the obtained binary codes not repeated. the

In this embodiment, the numerical values corresponding to the four number areas are 2, 5, 7, and 9 respectively; At the same time, the four sensors on the photoelectric sensor 2 are placed in the digital areas corresponding to the values 3, 5, 7, and 9, and the photoelectric sensors adopt infrared paired tube photoelectric sensors. the

Its working principle is: the transmitting end of the infrared tube photoelectric sensor emits infrared rays to the counting digital wheel 1. When the area to be irradiated does not have a light-transmitting hole 3, the infrared rays cannot penetrate, resulting in the receiving end of the corresponding photocoupler being unable to obtain Infrared signal, the coded signal obtained by the corresponding photocoupler is 0; when there is a light-transmitting hole 3 in the irradiated area, the infrared ray passes through the light-transmitting hole 3, and the coded signal obtained by the corresponding photocoupler is 1. the

The above is a counting reading device on a counting digital wheel. If there are multiple counting digital wheels on the flow meter, the counting reading device can be installed on each counting digital wheel accordingly. the

The photoelectric sensor 2 transmits the multiple groups of signals read to the signal processing circuit for processing, as shown in Figure 3, in the present embodiment, the model of the multi-way switch U2 is 4051, the single-chip microcomputer U1 adopts the 51 series 8051, and the photoelectric sensor 2 The output V02 is respectively connected to the pins IN1, IN2 and IN3 of the multi-way switch U2 of the model 4051. After the multi-group signals are processed by the single-chip microcomputer U1, the remote communication of the data can be realized, and the specific reading on the flow meter is displayed on the terminal. It is convenient to read the counts on the water, electricity and air flow meters. the

It is set that the code corresponding to the photoelectric sensor corresponding to the original value "3" at this time is the highest bit of the binary code, and the code corresponding to the value "9" is the lowest bit of the binary code. At this point, the relationship between the binary code and the reading is:

0001→0, 1110→1, 0000→2, 0111→3, 1000→4,

0011→5, 0100→6, 1001→7, 0010→8, 1100→9.

Claims (5)

1. An automatic counting device for a flowmeter, comprising a counting wheel (1), a photoelectric sensor (2), and a signal processing circuit, characterized in that the transmitting end of the photoelectric sensor (2) sends a signal to the photoelectric sensor (2) The receiving end receives, the photoelectric sensor (2) is connected to the signal processing circuit, and the counting wheel (1) is provided with a light-transmitting hole (3) for transmitting signals. 2. The automatic counting device of the flowmeter according to claim 1, characterized in that the light-transmitting holes (3) are 4 fan-shaped holes, and the light-transmitting holes (3) correspond to four on the counting wheel (1) Non-adjacent numeric regions. 3. The automatic counting device of the flow meter according to claim 1, characterized in that there are 4 photoelectric sensors (2), and the photoelectric sensors (2) correspond to 4 light-transmitting holes (3) respectively, and the The photoelectric sensor (2) is fixed. 4. The automatic counting device of the flow meter according to claim 1, characterized in that the signal processing circuit is composed of a single-chip microcomputer U1 and a multi-way switch U2, and the signal received by the photoelectric sensor (2) is transmitted to the single-chip microcomputer through the multi-way switch U2 U1. 5. The automatic counting device of the flow meter according to claim 1, characterized in that the photoelectric sensor (2) is an infrared paired photoelectric sensor.

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