CN102128665A - Device for detecting accuracy of mechanical water meter - Google Patents

Abstract

The invention discloses a mechanical water meter accuracy detection device. Including the water meter detection operation platform, the plum blossom finger speed detection device with the same number and structure as the water meter; among them: the water meter detection operation platform is connected in series from one side to the other side with multiple water inlet ports, regulating valves, and standard water meters The water meter to be tested and the water outlet; the base of each plum blossom finger speed detection device is installed side by side with a laser and a photosensitive transistor and connected to the detection circuit. The other end of the tool is connected with the corresponding water meter dial; observation windows are respectively opened on the top cover and the side of the base of the casing; the detection circuit in each detection device is connected with the data processing system respectively. Using a photoelectric sensor to detect the rotation speed of the plum blossom finger not only improves the accuracy of adjusting the water meter, but also improves work efficiency; the cost is low, and the water meter can be quickly adjusted on the industrial site, which effectively improves the accuracy of industrial water measurement.

Description

Mechanical water meter accuracy detection device

technical field

The invention relates to a measuring instrument for detecting liquid flow, in particular to a device for detecting the accuracy of a mechanical water meter.

Background technique

The accuracy of water meters has a direct impact on water measurement and plays a very important role in the rational use of water resources. In the process of manufacturers producing mechanical water meters, some products have inaccurate measurement of water consumption. This requires workers to adjust the measurement accuracy of the water meter by adjusting the adjusting screw at the back end of the water meter before leaving the factory and putting it into practical use. Make it meet the requirement of being able to measure water consumption accurately.

There is no instrument specially developed for regulating water meters in our country. At present, the device for workers to adjust the water meter mainly uses the verification device in JJG l62-2009 "Cold Water Meter Verification Regulations". It is composed of water source, switch valve, test pipe section, regulating valve and working volume. Install a number of water meters to be tested in series on the test pipe section, open the on-off valve to feed water into the test pipe section and inject it into the working volume, and use the regulating valve to adjust the water flow to the specified flow value. According to experience, workers visually check the speed of the plum blossom finger on the water meter dial (the plum blossom finger rotates with the rotation of the impeller of the mechanical water meter, and its speed is proportional to the speed of the impeller, so the speed of the plum blossom finger is related to the accuracy of the water meter), and adjust the adjusting screw at the back of the water meter until The plum blossom means that the speed reaches the standard speed of the water meter at this flow value. The water meter is deemed to be adjusted as a qualified meter. This set of water meter adjustment device has a low degree of automation, poor reliability, time-consuming verification process, and it is not convenient to quickly adjust the water meter. Among them, the water flow time of the four flow points such as common flow, boundary flow, minimum flow, and overload flow takes 30 minutes, and the entire detection takes about 1 hour. The adjustment process depends entirely on the worker's operating experience and the estimation of the supervisor, and the reliability is very low. Moreover, the efficiency of water meter adjustment is low. For some large-scale water meter manufacturers, tens of thousands of water meters are produced every day, and the adjustment of water meters is also a heavy work with a large workload and high labor intensity. Moreover, the detection time is long and the efficiency is low, and it is inconvenient to quickly adjust the water meter. Due to actual production needs, before the water meter is put into industrial application, it is necessary to adjust the water meter at the industrial site. The current adjustment device has a complex structure, which is not conducive to disassembly, movement and installation, and there are also great problems in the convenience and fast efficiency of practical application.

Contents of the invention

The purpose of the present invention is to provide a mechanical water meter accuracy detection device, which adopts a photoelectric detection method, improves the working efficiency and accuracy of water meter adjustment, and saves working time.

The purpose of the present invention is achieved through the following technical solutions:

Including the water meter detection operation platform, the plum blossom finger speed detection device with the same number and structure as the standard water meter and the water meter to be tested; among them:

1) Water meter detection operation platform: including the operation platform, water inlet end, water outlet end, pipeline, regulating valve, standard water meter, pipe sleeve, and water meter to be tested; the water inlet end is connected in series from one side to the other side of the operation table , regulating valve, standard water meter, multiple water meters to be tested and water outlets.

2) Each plum blossom finger speed detection device: includes a detection device and a data processing system;

The laser and the phototransistor are installed side by side on the base in the shell and connected with the detection circuit, the lower end of the base is connected with the light hood, one end of the fixing fixture is connected with the light hood, and the other end of the fixing fixture is connected with the corresponding water meter dial; the top of the shell Observation windows are respectively opened on the sides of the cover and the base; the detection circuits in each detection device are respectively connected with the data processing system.

The detection circuit includes: an amplifier, a trigger and a decoder; one end of the first potentiometer is connected to a (5V) power supply, and the other end is connected to the positive pole of the laser; the laser is a point laser module, and the negative pole is connected to the collector of the triode The base of the triode is connected to the rear end of the first resistor; one end of the second resistor is connected to the 5V power supply, and the other end is connected to the collector of the phototransistor; the phototransistor is a high-speed 3DU33 silicon phototransistor, and the emitter is connected to the ground; the first capacitor The front end of the resistor is connected to the collector of the phototransistor, and the back end is connected to the 2-pin of the amplifier; one end of the third resistor is connected to the 5V power supply, and the other end is connected to the 3-pin of the amplifier and the second potentiometer at the same time, and the 8-pin of the amplifier is connected to the 5V power supply Power supply, pin 4 grounded; pin 1 of the Schmitt trigger is connected to pin 1 of the output of the amplifier, pin 2 of the Schmitt trigger is connected to pin 2 of the decoder, and the reshaped signal is input into the decoder in reverse; The decoder is an LM567 phase-locked loop circuit, 1 pin is connected in series with the second capacitor for output filtering, 2 pins are connected in series with the third capacitor for loop filtering, and 4 pins are connected to 5V power supply; the front end of the third potentiometer is connected to 5 pins of the decoder, The rear end is connected in series with the fourth capacitor, and connected with pin 6 of the decoder; the pulse is output from pin 5 of the decoder to the front end of the first resistor; pin 8 of the decoder is connected with the single-chip microcomputer.

Compared with the background technology, the present invention has the beneficial effects that:

1. Use the photoelectric sensor to accurately detect the rotation speed of the plum blossom finger, instead of manually estimating the rotation speed. Effectively and intuitively providing the speed data of the water meter not only greatly improves the accuracy of adjusting the water meter, but also effectively reduces the work steps and improves the work efficiency, which can save a lot of time for large water meter manufacturers in adjusting the water meter.

2. The working gauge is omitted, the structure is simple, the cost is low, and it is convenient to transport the whole set of equipment to the industrial site for installation and use. The water meter can be quickly adjusted at the industrial site, which effectively improves the accuracy of industrial water measurement.

3. It belongs to digital sensor technology, which can realize the processing, storage and remote transmission of detection information, and facilitate data transmission. It is convenient for calling the data in the future.

Description of drawings

Figure 1 is a diagram of a mechanical water meter accuracy detection device.

Fig. 2 is a front view of the mechanical structure of the detection device.

Fig. 3 is a top view of the mechanical structure of the detection device.

Figure 4 is a detection circuit diagram.

Fig. 5 is a system diagram of the detection device.

In Figure 1: 1. Water inlet, 2. Pipeline, 3. Regulating valve, 4. Standard water meter, 5. Detection device, 6. Pipe sleeve, 7. Water meter to be tested, 8. Operating table, 9. Data processing system , 10. Water outlet.

In Fig. 2~3: 5-1. Fixing fixture, 5-2. Shade, 5-3. Laser, 5-4. Phototransistor, 5-5. Copper column, 5-6. Spring, 5-7 .Base, 5-8. Shell, 5-9. M4 screw, 5-10. Top cover, 5-11. Detection circuit, 5-12. M3 screw, 5-13. Observation window.

In Figure 4: U2 is the NE5332 comparator, U3 is the CD40106 Schmitt trigger, and U4 is the LM567 decoder.

Detailed ways

Embodiments of the present invention will be further described in detail below in conjunction with the accompanying drawings.

As shown in Figure 1, Figure 2, and Figure 3, it includes a water meter detection operation platform, a plum blossom finger speed detection device with the same number and structure as the standard water meter 6 and the water meter to be tested; wherein:

1) Water meter detection operation platform: including operation platform 8, water inlet 1, water outlet 10, pipeline 2, regulating valve 3, standard water meter 4, pipe sleeve 6, water meter to be tested 7; the top of the operation platform 8 is from one side to the The other side is connected in series with a water inlet 1, a pipeline 2, a regulating valve 3, a standard water meter 4, a pipe sleeve 6, a plurality of water meters to be tested 7 and a water outlet 10;

2) Each plum-blossom finger speed detection device: includes a detection device 5 and a data processing system 10;

The detection device 5 includes: a fixing fixture 5-1, a light shield 5-2, a laser 5-3, a photosensitive transistor 5-4, a copper column 5-5, a spring 5-6, a base 5-7, a shell 5-8, M4 screw 5-9, top cover 5-10, detection circuit 5-11, M3 screw 5-12 and observation window 5-13;

Laser 5-3 and phototransistor 5-4 are installed side by side on the base 5-7 in the shell 5-8 and are connected with the detection circuit 5-11, the lower end of the base 5-7 is connected with the light shield 5-2, and the fixing fixture 5- One end of 1 is connected with the hood 5-2, and the other end of the fixing fixture 5-1 is connected with the corresponding water meter dial; the top cover 5-10 and the side of the base 5-7 of the casing 5-8 are respectively provided with observation windows 5- 13 ; the detection circuits in each detection device 5 are respectively connected to the data processing system 10 .

As shown in FIG. 3 and FIG. 4 , the data processing system 10 includes a single chip microcomputer, a display device and keys.

The detection circuit includes: amplifier U2, trigger U3 and decoder U4; one end of the first potentiometer R2 is connected to a 5V power supply, and the other end is connected to the anode of the laser 5-3 to adjust the power of the laser 5-3; the laser 5- 3 is a point laser module, the cathode is connected to the collector of the triode Q1; the base of the triode Q1 is connected to the rear end of the first resistor R1 to modulate the laser emitted by the laser 5-3; one end of the second resistor R3 is connected to the 5V power supply The other end is connected to the collector of the phototransistor 5-4; the phototransistor 5-4 is a high-speed 3DU33 silicon phototransistor, the emitter is connected to the ground, and responds to the laser light emitted by the laser 5-3, converting the optical signal into a collector The electric signal of the electrode; the front end of the first capacitor C1 is connected to the collector of the phototransistor 5-4, and the rear end is connected to the 2 pin of the amplifier U2 to play the role of filtering; one end of the third resistor R4 is connected to the 5V power supply, and the other end is connected to the 5V power supply. One end is connected to the 3rd pin of the amplifier U2 and the second potentiometer R5 at the same time, the 8th pin of the amplifier U2 is connected to the 5V power supply, and the 4th pin is grounded; the signal output by the 2nd pin of the amplifier U2 is a shaped square wave; the Schmitt trigger U3 Pin 1 of the amplifier U2 is connected to pin 1 of the output terminal of the amplifier U2, pin 2 of the Schmitt trigger U3 is connected to pin 2 of the decoder U3, and the reshaped signal is inverted and input to the decoder U3; the decoder U3 is LM567 phase-locked Ring circuit, pin 1 is connected in series with the second capacitor C2 for output filtering, pin 2 is connected in series with the third capacitor C3 for loop filtering, pin 4 is connected to 5V power supply; the front end of the third potentiometer R5 is connected to pin 5 of the decoder U4, and the back end It is connected in series with the fourth capacitor C4 and connected to pin 6 of the decoder U4; the center frequency of the internal oscillator of the decoder U4 is adjusted to 4kHz by the third potentiometer R5, and the pulse is output from the 5 pin of the decoder U4 to the first resistor The front end of R1; the 8-pin of the decoder U4 is the decoding output terminal, which is connected with the single-chip microcomputer.

When testing, the testing device 5 is installed on the dials of the standard water meter 4 and the water meter to be tested 7 respectively, and the fixing clamps 5-1 on both sides of the plum blossom finger speed detection device are pressed to compress the spring 5-6. Extend the sunshade 5-2 into the metal ring of the dial, and loosen the fixing clamp 5-1 to fix it inside the metal ring of the dial. Observe the position where the laser is irradiated on the dial through the observation window 5-13, and rotate the detection device 5 until the laser is aligned with the tooth edge of the plum blossom finger. Open the regulating valve 3, the water flows through the standard water meter 4 and the water meter 7 to be tested, and the plum blossom finger rotates. When the tooth of plum-blossom finger forwards to detection position, the laser light that reflection laser 5-3 sends is received by phototransistor 5-4, produces a pulse. Set a fixed volume. When the amount of water in the pipeline 2 reaches a fixed volume, that is, when the plum blossom finger of the standard water meter 4 rotates X circles and the phototransistor 5-4 generates n pulses, the time t ₁ consumed when the phototransistor 5-4 generates n pulses. Simultaneously measure the time t ₂ consumed when the plum-blossom finger of the water meter 7 to be tested turns X circles and n pulses are generated by the phototransistor 5-4. According to the number of pulses and the time generated by the phototransistor 5-4, the standard water meter 4 and the water meter 7 to be tested can be obtained respectively. The accuracy of the water meter 7 to be tested can be obtained by comparing the data of the water meter 4 to be tested with the standard water meter 7 . The staff can adjust the water meter to be tested according to the accuracy.

Claims (2)

1. mechanical type water meter accuracy tester, it is characterized in that: comprise water meter detecting operation stand, identical, that structure is identical with water meter to be measured (7) number plum blossom with standard water meter (4) refers to speed detector; Wherein:

1) water meter detecting operation stand: comprise operator's console (8), water intake end (1), water side (10), pipeline (2), variable valve (3), standard water meter (4), pipe box (6), water meter to be measured (7); Be serially connected with water intake end (1), variable valve (3), standard water meter (4), a plurality of water meter to be measured (7) and water side (10) by a side successively to opposite side above the operator's console (8);

2) each plum blossom refers to speed detector: include pick-up unit (5) and data handling system (10);

Install side by side on the base (5-7) in shell (5-8) laser instrument (5-3) and phototriode (5-4) and with testing circuit (5-11), base (5-7) lower end is connected with light shield (5-2), one end of holding clamp (5-1) is connected with light shield (5-2), and the other end of holding clamp (5-1) connects with corresponding water meter dial plate; The top cover (5-10) of shell (5-8) and base (5-7) side have view window (5-13); Testing circuit in each pick-up unit (5) is connected with data handling system (10) respectively.

2. a kind of mechanical type water meter accuracy tester according to claim 1, it is characterized in that: described testing circuit comprises: amplifier (U2), trigger (U3) and demoder (U4); One end of first potentiometer (R2) connects the power supply of (5V) power supply, and the other end connects the positive pole of laser instrument (5-3); Laser instrument (5-3) is the point-like laser module, and negative pole links to each other with the collector of triode (Q1); The base stage of triode (Q1) connects first resistance (R1) rear end; One end of second resistance (R3) is connected with the 5V power supply, and the other end is connected with the collector of phototriode (5-4); Phototriode (5-4) is a high speed 3DU33 silicon phototriode, and emitter is connected with ground; The front end of first electric capacity (C1) links to each other with the collector of phototriode (5-4), and the rear end links to each other with 2 pin of amplifier (U2); One end of the 3rd resistance (R4) links to each other with the 5V power supply, and the other end connects 3 pin and second potentiometer (R5) of amplifier (U2) simultaneously, and 8 pin of amplifier (U2) connect the power supply of 5V power supply, 4 pin ground connection; 1 pin of Schmidt trigger (U3) links to each other with output terminal 1 pin of amplifier (U2), and 2 pin of Schmidt trigger (U3) link to each other with 2 pin of demoder (U3), with the signal inversion input decoder (U3) after the shaping; Demoder (U3) is the LM567 phase-locked loop circuit, and 1 pin, second electric capacity (C2) of connecting is exported filtering, and 2 pin the 3rd electric capacity (C3) of connecting carries out loop filter, and 4 pin connect the power supply of 5V power supply; The front end of the 3rd potentiometer (R5) links to each other with 5 pin of demoder (U4), connects with the 4th electric capacity (C4) in the rear end, and the pin that links to each other with 6 pin of demoder (U4); 5 pin of demoder (U4) output to first resistance (R1) front end; Pulse is linked to each other with single-chip microcomputer by 8 pin of demoder (U4).

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