Metering signal acquisition structure of photoelectric metering instrument

Abstract

The utility model discloses a metering signal acquisition structure of a photoelectric metering instrument, which is characterized by comprising a signal transmitting sheet and at least one pair of photoelectric transmitting and receiving assemblies, the signaling sheet is rotatably mounted in a transparent cover of a base meter of the metering instrument and is in driving connection with a metering follower in the metering instrument, and a light reflecting surface and a light absorbing surface are arranged on the upper surface, directly facing the transparent cover, of the signaling sheet in the circumferential direction; the pair of photoelectric transmitting and receiving assemblies is fixedly installed in an electronic metering module matched with the base meter, the electronic metering module is fixedly installed on the base meter, and the electronic metering module is provided with an attaching part which is right opposite to the signal transmitting piece and connected with the transparent cover in an attached mode. And the fitting part can allow the emitted light and the reflected light in each pair of photoelectric transceiving assemblies to pass through.

Description

Technical Field

[0001] The utility model belongs to the field of photoelectric measuring instruments, and in particular relates to a measuring signal acquisition structure of a photoelectric measuring instrument. Background Art

[0002] Measuring instruments can be divided into electromagnetic induction, ultrasonic or photoelectric types according to their measuring principles.

[0003] The metering signal baseline in a photoelectric meter is a line used as a reference standard during the photoelectric signal acquisition and processing process. For example, in a photoelectric detection circuit, the voltage signal corresponding to the absence of light (dark current state) is set as the baseline (usually zero level). When light is present, the photodiode generates a photocurrent. The amplitude change of the voltage signal converted by the amplifier circuit relative to this baseline represents the change in light intensity. By setting such a baseline, different light intensities can be easily quantified and compared, and a regular digital signal of 0 or 1 can be output, thus achieving measurement.

[0004] However, the existing photoelectric metering instrument measurement signal acquisition structure is relatively complex, the hardware cost is high (usually up to dozens of yuan), which is not conducive to the total cost control of the photoelectric metering instrument.

[0005] Based on this, the applicant considered designing a metering signal acquisition structure for a photoelectric meter that can better help reduce hardware cost. Summary of the Invention

[0006] In view of the above-mentioned deficiencies in the prior art, the technical problem to be solved by the present invention is: how to provide a measurement signal acquisition structure for a photoelectric meter that can better help reduce hardware cost.

[0007] In order to solve the above technical problems, the present invention adopts the following technical solutions:

[0008] The photoelectric metering instrument measurement signal acquisition structure is characterized by comprising a signal transmitting piece and at least one pair of photoelectric transmitting and receiving components;

[0009] The signal transmitting piece is rotatably mounted in a transparent cover of a base meter of a meter and is drivingly connected to a meter follower inside the meter. A light reflecting surface and a light absorbing surface are provided on the upper surface of the signal transmitting piece facing the transparent cover in the circumferential direction.

[0010] The pair of photoelectric transceiver components are fixedly installed in an electronic metering module matched with the base meter. The electronic metering module is fixedly installed on the base meter, and the electronic metering module has a fitting portion that is opposite to the signal transmitting piece and is fitted with a transparent cover. The fitting portion can allow the emitted light and reflected light in each pair of photoelectric transceiver components to pass through.

[0011] Compared with the existing technology, the advantages of the photoelectric meter signal acquisition structure of this technical solution are:

[0012] 1. The hardware structure is simpler and the hardware overhead cost is lower, which is more conducive to controlling the manufacturing cost of photoelectric measuring instruments and improving product competitiveness.

[0013] 2. The changes to the existing base meter and electronic metering module are small, which can better adapt to the existing metering instruments and improve practicality. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 Logical flow chart of the method for establishing the measurement signal baseline of the photoelectric measuring instrument

[0015] Figure 2 Flowchart of the offline judgment steps in the method for establishing the measurement signal baseline of a photoelectric measuring instrument

[0016] Figure 3 Schematic diagram of sampling signal and baseline in the method of establishing the measurement signal baseline of photoelectric measuring instrument

[0017] Figure 4 Schematic diagram of the measurement signal acquisition structure of the photoelectric measuring instrument (top view)

[0018] Figure 5 This is a schematic diagram of the structure of the electronic metering module in the metering signal acquisition structure of the photoelectric metering instrument (top view)

[0019] Figure 6 for Figure 5 Exploded view of the electronic metering module

[0020] Figure 7 This is a schematic diagram of the electronic metering module in the metering signal acquisition structure of the photoelectric meter (looking up).

[0021] Figure 8 for Figure 7 Exploded view of the electronic metering module

[0022] Figure 9 for Figure 8 Enlarged view of the dotted line portion

[0023] Figure 10a Schematic diagram of the signal transmission piece rotating and the two pairs of photoelectric transmitting and receiving components collecting signals (in state 11)

[0024] Figure 10b Schematic diagram of the signal transmission piece rotating and the two pairs of photoelectric transmitting and receiving components collecting signals (in state 01)

[0025] Figure 10cSchematic diagram of the signal transmission chip rotating and the two pairs of photoelectric transceiver components collecting signals (in state 00)

[0026] Figure 10d Schematic diagram of the signal transmission piece rotating and the two pairs of photoelectric transmitting and receiving components collecting signals (in state 10)

[0027] The following are marked in the figure:

[0028] A-base meter: signal plate (A10 light reflecting surface, A11 light absorbing surface), A2 transparent cover

[0029] B Electronic metering module: B1 bonding part, B2 lens, photoelectric transmitter and receiver assembly (B30 light emitting tube, B31 light receiving tube), B4 PCB board, B5 light blocking sheet (B51 limit protrusion), B6 ​​light blocking ring DETAILED DESCRIPTION

[0030] The present invention will be described in further detail below with reference to the accompanying drawings.

[0031] A photoelectric metering instrument measurement signal acquisition structure, comprising a signal transmitting piece and at least one pair of photoelectric transmitting and receiving components;

[0032] The signal transmitting piece is rotatably mounted in a transparent cover of a base meter of a meter and is drivingly connected to a meter follower inside the meter. A light reflecting surface and a light absorbing surface are provided on the upper surface of the signal transmitting piece facing the transparent cover in the circumferential direction.

[0033] The pair of photoelectric transceiver components are fixedly installed in an electronic metering module matched with the base meter. The electronic metering module is fixedly installed on the base meter, and the electronic metering module has a fitting portion that is opposite to the signal transmitting piece and is fitted with a transparent cover. The fitting portion can allow the emitted light and reflected light in each pair of photoelectric transceiver components to pass through.

[0034] During implementation, the metering follower is an impeller in a water meter, or the metering follower is an output side of a mechanical transmission group in a gas meter or an input shaft (or gear) of a wheel counter.

[0035] During implementation, the light-reflecting surface on the signaling piece can be directly a metal surface (such as a gold-plated or silver-plated or metal polished surface) or a reflective film (such as a nano-silicon dioxide particle layer, a reflective ceramic layer); the light-absorbing surface on the signaling piece can be directly a black coating or a black wrapping layer (such as black pigment, black rubber, black metal oxide or black semiconductor material or black plastic).

[0036] Compared with the existing technology, the advantages of the photoelectric meter signal acquisition structure of this technical solution are:

[0037] 1. The hardware structure is simpler and the hardware overhead cost is lower, which is more conducive to controlling the manufacturing cost of photoelectric measuring instruments and improving product competitiveness.

[0038] 2. The changes to the existing base meter and electronic metering module are small, which can better adapt to the existing metering instruments and improve practicality.

[0039] The bonding portion has a through hole that covers and faces the signal transmitting piece in the orthographic projection direction, and a lens is sealed and fixed at the through hole.

[0040] The structure of the above-mentioned fitting part can not only effectively ensure the light transmission and reception of the optoelectronic transceiver assembly, but also play a better role in sealing the perforation, thereby making the interior of the electronic metering module have better sealing, and permanently ensuring that the various electronic devices inside the electronic metering module have a more suitable operating environment.

[0041] During implementation, the lens material is one of glass (quartz glass or tempered glass) and transparent plastic (acrylic or PC material).

[0042] Glass's refractive index typically ranges from 1.4 to 1.9, effectively controlling light refraction and ensuring more precise infrared light transmission and reception. Furthermore, glass has a light transmittance exceeding 90% and is not susceptible to significant declines in transmittance over time due to environmental factors such as temperature and humidity. This ensures long-term reliable light transmission and the long-term reliability of optoelectronic transceiver components.

[0043] Among them, the light transmittance of transparent plastic can reach about 92%, and its density is about half that of glass, so it is lighter; but transparent plastic has poor thermal stability, and its light transmittance is prone to change in a continuous high temperature environment.

[0044] Wherein, each pair of the optoelectronic transmitting and receiving components is fixedly mounted on the lower surface of the PCB board inside the electronic metering module.

[0045] In this way, a modular structure is formed between the optoelectronic transceiver components and the PCB board in the electronic metering module, and mature SMT patch technology can be directly used for rapid production, thereby accelerating the production efficiency of the electronic metering module.

[0046] At the same time, the photoelectric transceiver assembly first blocks the ambient light by utilizing the outer shell of the electronic metering module, and the photoelectric transceiver assembly is arranged on the lower surface of the PCB. The PCB board can also be used to further block the ambient light, significantly reducing the signal interference of the ambient light on the reliable working process of the photoelectric transceiver assembly.

[0047] Wherein, the upper surface of the PCB board facing away from the optoelectronic transceiver component has a thickened light shielding layer.

[0048] During implementation, the thickened light-shielding layer is an electroplated thickened layer or a coated insulating material or a thickened PCB substrate.

[0049] The thickened light-shielding layer can further block ambient light and play a better role in shielding light interference.

[0050] The photoelectric meter signal acquisition structure further includes a light-blocking sheet fixed to the lower surface of the PCB, wherein the light-blocking sheet is made of an opaque material;

[0051] The light emitting tube and the light receiving tube in each pair of photoelectric transmitting and receiving components are independently located in a corresponding single penetrating light hole on the light blocking sheet.

[0052] During implementation, it is preferred that the light blocking sheet is entirely pressed between the lens and the lower surface of the PCB board.

[0053] The advantage of setting up the above-mentioned light blocking sheet is that it can not only further shield the interference of ambient light on the luminescence and reflection of the optoelectronic transceiver component; it can also use the light blocking sheet to completely isolate the interference of the photoelectric transceiver component's own transmission and reflection process, thereby improving the accuracy of the acquisition of the reflected light and non-reflected light intensity signal of the transmitting piece.

[0054] At the same time, the setting of the light blocking sheet is also conducive to ensuring the accuracy of light intensity signal collection using 2 or more pairs of optoelectronic transmitting and receiving components, which has better application effects.

[0055] Wherein, the opaque material used to make the light-blocking sheet is all black, and the composition of the opaque material is any one of plastic, composite material, rubber or silicone.

[0056] During implementation, composite materials such as glass fiber or carbon fiber are processed and molded with resin.

[0057] The material of the above-mentioned light blocking sheet can be elastically deformed, and can be placed between the lens and the PCB board and fully squeezed, so that the contact surface between the light blocking sheet and the PCB and the contact surface between the light blocking sheet and the lens are fully sealed and effectively isolate the ambient light, achieving the best anti-light interference effect and better ensuring the accuracy of light intensity signal collection.

[0058] After testing, it was found that the measurement signal acquisition structure of the photoelectric meter using the above-mentioned light-blocking sheet can achieve reliable signal acquisition in an environment with a light intensity of up to 45,000 lux.

[0059] Wherein, a limiting protrusion is provided on the upper side surface of the light-blocking sheet, and correspondingly, an assembly hole for inserting the limiting protrusion into the limiting position is provided on the PCB board.

[0060] During implementation, it is preferred that the limiting protrusion is a rectangular structure, or the number of the limiting protrusions is at least two.

[0061] In this way, the light blocking sheet can be quickly plugged into the corresponding assembly hole on the PCB through the structure of its own limiting protrusion, thereby simplifying and accelerating the assembly efficiency of the light blocking sheet.

[0062] The number of the optoelectronic transceiver components is two pairs arranged at 90-degree intervals in the circumferential direction;

[0063] The signaling piece is in the shape of a circular piece, and the light reflecting surface and the light absorbing surface of the signaling piece are both half a semicircle.

[0064] The advantages of the above structure are:

[0065] 1. The setting of two pairs of photoelectric transmitting and receiving components can determine whether the transmitting chip is rotating forward or reverse by the change of the generated signal, thereby judging whether the measuring instrument is rotating forward or reverse, and can detect abnormalities in time.

[0066] 2. The two pairs of photoelectric transceiver components are closer together in the circumferential direction, so that the two pairs of photoelectric transceiver components can be more concentrated in positions of equal brightness (darkness), achieving better signal collection consistency.

[0067] 3. Two pairs of photoelectric transmitter and receiver components arranged at 90-degree intervals can divide the 360° circumference into four equal parts and can stay in the high and low level signal collection area (the light reflection surface and light absorption surface of the transmitter are both half a semicircle (180 degrees)) for a longer time. Therefore, whether in the high-frequency or low-frequency sampling period, the high and low levels can be collected more timely and accurately, thereby obtaining accurate measurement signals.

[0068] The housing of the electronic metering module further comprises a light-blocking ring sleeved on the outside of the transparent cover of the base meter and a light-blocking cover (not shown in the figure) hingedly assembled with the light-blocking ring and used to cover or open the transparent cover of the base meter.

[0069] During implementation, it is preferred that the housing of the electronic metering module is made of black or gray plastic.

[0070] The above-mentioned setting of the light-blocking ring and the light-blocking cover can create a darker environment inside the space covered by the light-blocking ring and the light-blocking cover, and better prevent the interference of ambient light on the optoelectronic transmitting and receiving components.

[0071] The two pairs of the optoelectronic transmitting and receiving components are located on the innermost side of the light-blocking sheet close to the center of the base surface transparent cover.

[0072] In this way, the two pairs of optoelectronic transmitting and receiving components can be located in the darkest area, thereby achieving the best effect of resisting ambient light interference signals.

[0073] The following method for establishing a metrological signal baseline of a photoelectric meter adopts the above-mentioned metrological signal acquisition structure of the photoelectric meter to obtain the photoelectric signal.

[0074] A method for establishing a measurement signal baseline of a photoelectric measuring instrument comprises the following steps:

[0075] Step 1: Establish an initial baseline

[0076] During the initial preset sampling periods, when the maximum amplitude of the sampling signal is equal to each other for N consecutive times and the minimum amplitude is equal to each other for N consecutive times, the initial values ​​are obtained: the maximum amplitude V0max of the photoelectric signal and the minimum amplitude V0min of the photoelectric signal; and the initial baseline is established as: (V0max+V0min) / 2;

[0077] Assume the amplitude difference threshold value D, the restriction condition of D is: D ≥ N × △e, △e is the specified error, N is a positive number;

[0078] In practice, “equal” means that the sampled values ​​are within the specified error ± △ e, are considered equal.

[0079] Step 2: When the maximum or minimum sampling signal amplitude changes multiple times in a row, refresh the baseline

[0080] Within a preset number of sampling cycles, real-time acquisition values ​​are obtained: the maximum amplitude Vrmax and the minimum amplitude Vrmin of the photoelectric signal;

[0081] When Vrmax>V0max, reset according to the preset instruction and refresh the maximum amplitude Vnmax of the photoelectric signal according to the real-time sampling signal;

[0082] When Vrmin<V0min, reset according to the preset instruction and refresh the minimum amplitude Vnmin of the photoelectric signal according to the real-time sampling signal;

[0083] n is a positive integer greater than or equal to 1;

[0084] The refresh baseline is: (arithmetic mean of Vnmax + arithmetic mean of Vnmin) / 2;

[0085] Step 3: Establish upper and lower retracement baselines

[0086] When Vrmax-Vrmin≥amplitude difference threshold D, then:

[0087] The previous retracement baseline is: refresh baseline × (1 + 0.1 to 0.3);

[0088] The lower hysteresis baseline is: refresh baseline × (1-0.1 to 0.3).

[0089] In the second step: the process of resetting and refreshing the maximum amplitude Vnmax of the photoelectric signal according to the sampling signal is: the initial value of Vnmax is 0, and Vnmax is refreshed from small to large.

[0090] Because the maximum values ​​of different measuring instruments vary, setting a non-zero empirical value (Vmax_c) as the initial maximum value will likely result in Vmax_c exceeding the actual maximum value, making it impossible to find the actual maximum value later. Therefore, setting the initial value to 0 and searching from smaller to larger values ​​will ensure that the maximum value is always found, making this step more universal.

[0091] Adopting the above Vnmax refresh method can make Vnmax change more slowly, allowing the optical receiver to have enough time to accurately detect signal changes and improve acquisition accuracy. In addition, refreshing Vnmax from small to large can better suppress and reduce interference and noise, thereby obtaining a more accurate Vnmax value.

[0092] In the second step: the process of resetting and refreshing the minimum amplitude Vnmin of the photoelectric signal according to the sampling signal is: the initial value of Vnmin is (+)4096, and Vnmin is refreshed from large to small.

[0093] Similarly, the minimum values ​​of different measuring instruments vary. If you set an empirical value Vmin_c other than +4096 as the initial minimum value, Vmin_c is likely to be lower than the actual minimum value, making it impossible to find the actual minimum value later. Therefore, set the initial value to 4096 (the absolute upper limit) and search from higher to lower values ​​to consistently find the minimum value. This also makes this step more universal.

[0094] Similarly, using the above Vnmin refresh method can make Vnmin change more slowly, allowing the optical receiver to have enough time to accurately detect signal changes and improve acquisition accuracy. In addition, refreshing Vnmin from large to small can better suppress and reduce interference and noise, thereby obtaining a more accurate Vnmin value.

[0095] The method for establishing a metering signal baseline of a photoelectric meter further includes an offline judgment step, which can be performed before or after any one of the first to third steps. The offline judgment step includes:

[0096] Step a: Collect ambient light signals

[0097] The light emitting tube is not powered, and the light receiving tube is powered and continuously collects data for time t1: When the light receiving tube collects a continuous and stable voltage, it stores the voltage and uses it as the ambient light signal: Vb;

[0098] Step b: Collect the superposition signal of ambient light and reflected light

[0099] The light emitting tube is powered on, the light receiving tube is powered on and continues to collect data for time t2: When the light receiving tube collects a continuous and stable voltage, the voltage is stored and used as the superposition signal of ambient light and reflected light: Vc;

[0100] Step c: Determine whether it is offline

[0101] The light emitting tube and the light receiving tube are both powered off; calculate the effective reflected light signal: Vr = Vc - Vb;

[0102] When Vr≤△e occurs n times, the system is offline, where △e≈0 and n is a positive integer between 1 and 10; when Vr>△e, the system is not offline.

[0103] During implementation, t1 and t2 are user-defined times and must not exceed 1ms. Offline checking is ongoing, and a longer duration can affect normal metering collection.

[0104] Currently, photoelectric meters typically incorporate a photoelectric electronic metering module attached to a base meter. The base meter is essentially a standard water meter, and the electronic metering module, mounted on top, generates electronic readings by emitting infrared light and receiving reflected light signals, measuring the rotation of a transmitter.

[0105] Under normal circumstances, the mechanical and electronic readings match. However, if the base meter is disconnected from the electronic module (known in the industry as "offline"; for example, due to malicious operation), the base meter will continue to measure while the electronic meter module will no longer measure. This will cause the mechanical and electronic readings to disagree, leading to metering disputes.

[0106] For offline detection, the general approach in the industry is to add Hall elements and magnetic steel to the base meter and electronic metering module for detection. Therefore, the existing solution has additional hardware cost overhead for offline detection.

[0107] The offline judgment in this technical solution only uses the existing hardware. The processing method directly collects and analyzes the infrared signal through software, which can reliably determine whether the offline situation has occurred without the need for additional hardware costs. The offline judgment effect is good.

[0108] The method of using the measurement signal baseline of the photoelectric measuring instrument is as follows: before the upper hysteresis baseline and the lower hysteresis baseline are established, if the sampling signal amplitude is greater than the initial baseline, the output is 1, and if it is less than the initial baseline, the output is 0;

[0109] After the upper hysteresis baseline and the lower hysteresis baseline are established, if Vnmax ≥ sampling signal amplitude > upper hysteresis baseline, then the output is 1; if the lower hysteresis baseline > sampling signal amplitude ≥ Vnmin, then the output is 0;

[0110] When the sampling amplitude is between the upper hysteresis baseline and the lower hysteresis baseline, the output remains unchanged.

[0111] The use and working principle of the method for establishing the measurement signal baseline of the photoelectric measuring instrument in this technical solution:

[0112] First of all, when the photoelectric measuring instrument is in use, due to changes in working conditions (such as different ambient light intensity during the day and at night, jitter in the installation and use environment of the photoelectric measuring instrument, the installation and use environment of the photoelectric measuring instrument is difficult to be in a constant temperature environment so the ambient temperature changes greatly, and the photoelectric measuring instrument's own reflectors, light emitting tubes, light receiving tubes and other components aging, etc.), the maximum or minimum amplitude of the collected signal will change.

[0113] After adopting this technical solution, when the maximum or minimum amplitude of the collected signal changes, the changed maximum or minimum amplitude will be refreshed, and the baseline will be refreshed according to the new maximum or minimum amplitude, and the refreshed baseline will be used as the basis for collecting the metering signal, so as to better adapt to changes in working conditions and ensure accurate measurement under different working conditions.

[0114] At the same time, this technical solution is provided with the above third step, in which the conditional judgment of "Vrmax-Vrmin≥amplitude difference threshold value D" can prevent the metering instrument from erroneously outputting metering signals under frequent jitter conditions, thereby better ensuring the accuracy of measurement under such working conditions. Furthermore, the effective establishment of the upper hysteresis baseline and the lower hysteresis baseline can accurately ensure that the signal 1 is output only when the amplitude of the sampled signal is in the "upper hysteresis baseline and maximum amplitude interval", and the signal 0 is output only when the amplitude of the sampled signal is in the "lower hysteresis baseline and minimum amplitude interval". This has better anti-jitter interference and lastingly ensures the reliability of the meter measurement.

[0115] From the above, compared with the prior art, the method for establishing the measurement signal baseline of the photoelectric measuring instrument of the present technical solution has the following advantages:

[0116] 1. The baseline has dynamic adaptive characteristics, which can dynamically adjust the baseline of the metering signal according to the various working conditions of the instrument, so as to better ensure that the photoelectric metering instrument has high measurement accuracy under various working conditions.

[0117] 2. Better anti-interference and anti-jitter performance.

[0118] 3. This method has low hardware requirements and can be implemented with low-configuration hardware. It also has small calculation amount and low power consumption, which can better help control the manufacturing cost of photoelectric measuring instruments and improve product competitiveness.

[0119] The following is the preferred structure for collecting measurement signals of photoelectric measuring instruments:

[0120] The above are only preferred implementations of the present invention. It should be pointed out that various modifications and improvements made by those skilled in the art without departing from the present technical solution should also be deemed to fall within the scope of protection required by the claims.

Claims

1. Photoelectric measuring instrument measurement signal acquisition structure, characterized in that: It includes a signal transmitting piece and at least one pair of optoelectronic transmitting and receiving components; The signal transmitting piece is rotatably mounted in a transparent cover of a base meter of a meter and is drivingly connected to a meter follower inside the meter. A light reflecting surface and a light absorbing surface are provided on the upper surface of the signal transmitting piece facing the transparent cover in the circumferential direction. The pair of photoelectric transceiver components are fixedly installed in an electronic metering module matched with the base meter. The electronic metering module is fixedly installed on the base meter, and the electronic metering module has a fitting portion that is opposite to the signal transmitting piece and is fitted with a transparent cover. The fitting portion can allow the emitted light and reflected light in each pair of photoelectric transceiver components to pass through.

2. The photoelectric meter signal acquisition structure according to claim 1, characterized in that: The fitting portion has a through hole which covers and faces the signal transmitting piece in the orthographic projection direction, and a lens is sealed and fixed at the through hole.

3. The photoelectric meter signal acquisition structure according to claim 1 or 2, characterized in that: Each pair of the photoelectric transmitting and receiving components is fixedly mounted on the lower surface of the PCB board inside the electronic metering module.

4. The photoelectric meter signal acquisition structure according to claim 3 is characterized in that: The upper surface of the PCB board facing away from the optoelectronic transceiver assembly has a thickened light shielding layer.

5. The photoelectric meter signal acquisition structure according to claim 3 is characterized in that: It also includes a light-blocking sheet that can be fixed to the lower surface of the PCB board, and the light-blocking sheet is made of an opaque material; The light emitting tube and the light receiving tube in each pair of photoelectric transmitting and receiving components are independently located in a corresponding single penetrating light hole on the light blocking sheet.

6. The photoelectric meter signal acquisition structure according to claim 5, characterized in that: The opaque materials used to make the light-blocking sheets are all black, and the composition of the opaque materials is any one of plastic, composite material, rubber or silica gel.

7. The photoelectric meter signal acquisition structure according to claim 5, characterized in that: A limiting protrusion is provided on the upper side of the light-blocking sheet, and correspondingly, an assembly hole for the limiting protrusion to be inserted into for limiting is provided on the PCB board.

8. The photoelectric meter signal acquisition structure according to claim 1, characterized in that: The number of the photoelectric transceiver components is two pairs arranged at 90-degree intervals in the circumferential direction; The signaling piece is in the shape of a circular piece, and the light reflecting surface and the light absorbing surface of the signaling piece are both half a semicircle.

9. The photoelectric meter signal acquisition structure according to claim 8, characterized in that: The housing of the electronic metering module also comprises a light-blocking ring sleeved on the outside of the transparent cover of the base meter and a light-blocking cover hingedly assembled with the light-blocking ring and used for covering or opening the transparent cover of the base meter.

10. The photoelectric meter signal acquisition structure according to claim 9, characterized in that: The two pairs of photoelectric transmitting and receiving components are located on the light-blocking sheet at the innermost side close to the center of the base surface transparent cover.

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