Dynamic weighing metering method and device for water meter verification table

Abstract

The invention discloses a dynamic weighing metering method and device for a water meter verification table, and relates to the field of water meter identification, and the method comprises the steps: S1, measuring the water flow mass, and obtaining the weight of the water flow in a weighing water tank under the action of an electronic scale after the water flow injected into the weighing water tank is stable; s2, density is obtained, the increased water flow volume increment is obtained through calculation of computer data, and recording is carried out. According to the dynamic weighing metering method and device for the water meter verification platform, as the opening and closing of the switch valve influences the flow state and has time difference, quantitative water is stored in the weighing water tank, the system error caused by the fact that the absolute reading of an electronic scale is obtained by means of the opening and closing of the switch valve in traditional dynamic weighing is avoided, and the defect of low static verification efficiency is avoided; when the electronic scale is used for weighing, data are calculated according to the difference between the weight and the volume, and the application of the method not only can improve the verification precision, but also can improve the identification efficiency, so that huge economic benefits are certainly generated, and the industry innovation is guided.

Description

Technical Field

[0001] The present invention relates to the technical field of water meter identification, and particularly to a dynamic weighing and metering method and device for a water meter calibration bench. Background Art

[0002] The dynamic weighing and metering method of a water meter calibration bench is a technology used to calibrate and test the performance of water meters, mainly by dynamically measuring the flow rate and mass change of water meters under actual working conditions.

[0003] In the prior art, the errors generated are relatively large. The opening and closing of the switch easily affect the flow state, and there is a time difference in opening and closing, which easily leads to low efficiency.

[0004] In order to overcome the above deficiencies, a Chinese patent of the prior art (publication number CN102494743A) discloses a small-flow automatic detection device and detection method for water meters. The device uses a computer to comprehensively control the detection process, error calculation, and management of test data; uses a photoelectric sensor to convert the rotation signals of the plum blossom needles of the standard water meter and the water meter to be tested into electrical square wave signals and output them to the input port of the controller; uses the controller to execute specific control actions and data acquisition. The flow control part uses the output signal of the differential pressure flow sensor as the feedback signal for flow control. The error measurement part collects the output signals of the photoelectric sensors of the standard water meter and the water meter to be tested. When collecting data, the decimal pulse counting method is used, and then the collected data is sent to the computer. The computer calculates the error value of the water meter to be tested according to the test data. The decimal pulse calculation method used can effectively shorten the test time of the water meter, thereby greatly improving the water meter test efficiency and solving the production bottleneck problem caused by the slow water meter detection speed in large-scale water meter production.

[0005] In order to overcome the above deficiencies, a Chinese patent of the prior art (publication number CN110231074B) discloses a method for quickly detecting the error of a water meter, making the water flow reach the flow point to be tested and flow through the water meter to drive the impeller in the water meter to rotate; when the water meter is running, collect the actual pulse signal generated when the flow point to be tested flows through the water meter, and record the actual pulse period generated when the flow point to be tested flows through the water meter; read the comparison table, and take the flow coefficient corresponding to the order where the flow point to be tested is located; the ratio of the corresponding flow coefficient to the actual pulse period is the actual instantaneous flow rate of the flow point to be tested; compare the actual instantaneous flow rate with the standard instantaneous flow rate to obtain the indication error of the water meter. Through the comparison table data stored in the storage unit, the quick verification of the indication error of the water meter is realized. Compared with the traditional volumetric method manual verification scheme, the production efficiency is greatly improved, and at the same time, the energy consumption is also greatly reduced.

[0006] Although the prior art can overcome the above-mentioned deficiencies, there are still other problems in its operation, such as: the switching valve is likely to cause a large error in the system, there is a time delay in the opening and closing of the water meter by the valve, time is likely to affect the accuracy, the detected precision is relatively low, and the identification efficiency is poor. Summary of the Invention

[0007] The purpose of the present invention is to provide a dynamic weighing and metering method and device for a water meter verification bench, so as to solve the problems in the above-mentioned background technology that the switching valve is likely to cause a large error in the system, there is a time delay in the opening and closing of the water meter by the valve, time is likely to affect the accuracy, the detected precision is relatively low, and the identification efficiency is poor.

[0008] To achieve the above purpose, the present invention provides the following technical solutions: A dynamic weighing and metering method and device for a water meter verification bench, including S1, measuring the mass of water flow; S2, obtaining the density; S3, measuring the flow rate; S4, effective comparison; S5, data of the water meter to be measured; S6, error comparison; specifically including the following steps: S1, measuring the mass of water flow After the water flow injected into the weighing water tank is stable, under the action of the electronic scale, the weight of the water flow inside the weighing water tank is obtained. S2, obtaining the density Through the calculation of computer data, the increased water volume increment is obtained and recorded. S3, measuring the flow rate Under the calculation of computer software, the flow rate measured this time is measured, and it is judged whether the measurement result is valid according to the result. If it is invalid, it needs to be measured again. S4, effective comparison When the calculation result is valid, the sensor obtains the pulse interval from the water meter to be measured, and obtains the pulse increment and pulse equivalent through multiple pulses. S5, data of the water meter to be measured The increment of the water volume passing through the water meter to be measured is calculated and recorded after the data is obtained. S6, error comparison The computer system automatically calculates the error of the water meter to be measured, and the meter inspector reads out the data and judges whether it meets the requirements. The dynamic weighing and metering of the water meter verification bench includes a box, a water pump, a pressure stabilizing tank, an electric valve, a second switching valve, three flow regulating valves, a weighing water tank, an electronic scale, a first switching valve, a computer and a sensing system. The water meter to be measured is clamped between the electric valve and the second switching valve.

[0009] Further, in S1, the metering starts after the system is stabilized, and after a time interval ∆t, the metering stops when the verification water flow rate is reached, and the water mass increment of the weighing water tank is ∆m.

[0010] Further, in step S2, the computer automatically obtains the density at this temperature based on the temperature sensor and converts it into a volume increment ∆V, and the formula is:

[0011] -- The density of water at temperature t.

[0012] Further, in step S3, the computer software calculates the measured flow rate this time , and the formula is:

[0013] Whether the flow rate in this measurement process is valid is determined by the Q value. When it is invalid, the computer system automatically adjusts the flow rate and re-measures.

[0014] Further, when it is valid in step S4, the following calculation and comparison are carried out: The sensor starts timing from obtaining the first pulse from the water meter under test. The pulse interval time is ∆T, and N pulses are obtained, that is, timing stops after the last pulse. The pulse increment is: N - 1, and the pulse equivalent is P.

[0015] Further, the water volume increment of the water meter under test in step S5 is , and the formula is:

[0016] The obtained data is stored and then compared.

[0017] Further, in step S6, the computer suction system automatically calculates the error of the water meter under test , and the formula is:

[0018] The meter inspection personnel read and determine whether the metering accuracy of the water meter meets the requirements.

[0019] Further, a long slot is opened on the left side of the weighing water tank, and a water inlet pipe is nested inside the long slot. A disc baffle is arranged at the right end of the water inlet pipe, and the disc baffle is located outside the long slot. A fixing plate is fixedly installed on the left side of the weighing water tank, a limiting rod is fixedly installed inside the fixing plate, and the middle end of the limiting rod penetrates through the disc baffle.

[0020] Further, a vertical rod is fixedly installed inside the weighing water tank, a floating plate is installed through the surface of the vertical rod, round holes are opened on the surface of the floating plate, and the outer side of the floating plate fits the inner wall of the weighing water tank. A pressure relief plate is installed through the upper end of the vertical rod, an inclined block is fixedly installed on the outer side of the pressure relief plate, and the outer side of the inclined block corresponds to the inner wall of the weighing water tank.

[0021] Furthermore, a water wheel plate is rotatably installed inside the weighing water tank, and the left side of the water wheel plate corresponds to the right outlet of the water inlet pipe. A rotating rod is rotatably installed on the inner wall of the weighing water tank, and the rear end of the rotating rod is nested and connected to the water wheel plate through a transmission belt and a pulley. A cam is fixedly installed on the surface of the rotating rod, and the cam is located below the pressure relief plate. A positioning plate is fixedly installed on the inner wall of the weighing water tank, and a return spring is fixedly installed between the upper end of the positioning plate and the pressure relief plate.

[0022] Compared with the prior art, the beneficial effects of the present invention are as follows: 1. Due to the opening and closing of the switch valve affecting the flow state and having a time difference in opening and closing, by storing a fixed amount of water inside the weighing water tank, the systematic error caused by the traditional dynamic weighing method of obtaining the absolute reading of the electronic scale by means of the opening and closing of the switch valve is avoided. Furthermore, the defect of low efficiency in static calibration is avoided. When weighing by the electronic scale, the data is calculated through the difference between the weight and the volume. The application of this method can not only improve the calibration accuracy but also improve the calibration efficiency, which will surely generate huge economic benefits and lead the industry to innovation.

[0023] 2. When measuring the weighing water tank by the electronic scale, two disc baffles are arranged on the right side of the water inlet pipe. The disc baffles block the long strip groove on the left side of the weighing water tank, enabling the water inlet pipe to move up and down along the long strip groove, thereby ensuring that the water inlet pipe can move horizontally up and down, avoiding the weight of the water inlet pipe affecting the weighing of the weighing water tank. After weighing, by connecting the water outlet valve to an external pipe, the water can be discharged. Furthermore, when the water detected by the water meter enters the inside of the weighing water tank through the water inlet pipe, it falls on the pressure relief plate at the upper end of the vertical rod. The pressure relief plate blocks the water, enabling the water entering the inside of the weighing water tank to flow along the inner wall of the weighing water tank along the inclined block at the edge of the pressure relief plate. After the water accumulates to an appropriate amount, the floating plate will be lifted by buoyancy, making the floating plate located on the water surface, thereby avoiding the water flow impacting the inside of the weighing water tank, resulting in long-term shaking of the water flow and affecting the detection efficiency. Even further, when the water inlet pipe is admitting water, the water flow impacts the water wheel plate, and the water wheel plate rotates at this time. It can drive the lower rotating rod to rotate through the pulley and the transmission belt. Under the restriction of the return spring at the upper end of the positioning plate, the pressure relief plate can move up and down, achieving shaking, promoting the speed of the water flow falling, improving the efficiency, and avoiding the water flow accumulating on the upper end of the pressure relief plate, saving the time of the staff. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a schematic flow chart of the present invention; Figure 2 It is a schematic circuit diagram of the present invention; Figure 3 Schematic diagram of the three-dimensional structure of the weighing water tank of the present invention; Figure 4 Schematic diagram of the rear three-dimensional structure of the weighing water tank of the present invention; Figure 5 Schematic diagram of the front cross-sectional three-dimensional structure of the weighing water tank of the present invention; Figure 6 Schematic diagram of the side three-dimensional structure of the disc baffle of the present invention; Figure 7 Schematic diagram of the side cross-sectional three-dimensional structure of the pressure relief plate of the present invention; Figure 8 For the present invention Figure 7 Enlarged structure diagram at position A in; Figure 9 Schematic diagram of the top three-dimensional structure of the positioning plate of the present invention.

[0025] In the figure: 1. Weighing water tank; 2. Water inlet pipe; 3. Long strip groove; 4. Disc baffle; 5. Fixed plate; 6. Limit rod; 7. Water outlet valve; 8. Vertical rod; 9. Floating plate; 10. Round hole; 11. Pressure relief plate; 12. Tilt block; 13. Water wheel plate; 14. Transmission belt; 15. Rotating rod; 16. Cam; 17. Positioning plate; 18. Return spring. Specific implementation manners

[0026] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0027] Embodiment 1: As Figure 1 And Figure 2 Shown in the technical solution, a dynamic weighing and metering method and device for a water meter calibration bench, in order to solve the problems of large detection error and low efficiency, discloses: S1. Measure the mass of the water flow; S2. Obtain the density; S3. Measure the flow rate; S4. Make an effective comparison; S5. Data of the water meter to be measured; S6. Error comparison; Specifically includes the following steps: S1. Measure the mass of the water flow After the water flow injected into the weighing water tank 1 is stable, under the action of the electronic scale, the weight of the water flow inside the weighing water tank 1 is obtained; S2. Obtain the density Through the calculation of computer data, obtain the increased water volume increment and record it; S3. Measure the flow rate Under the calculation of computer software, the flow rate of this measurement is measured, and based on the result, it is judged whether the measurement result is valid. If it is invalid, a re-measurement is required; S4. Effective Comparison When the calculation result is valid, the sensor obtains the pulse interval from the water meter under test, and obtains the pulse increment and pulse equivalent through multiple pulses; S5. Data of the Water Meter Under Test Calculate the increment of the water volume passing through the water meter under test, and record the data after obtaining it; S6. Error Comparison The computer system automatically calculates the error of the water meter under test, and the meter inspector reads the data and judges whether it meets the requirements; The dynamic weighing and metering of the water meter verification bench consists of a box, a water pump, a pressure stabilizing tank, an electric valve, a second switching valve, three flow regulating valves, a weighing water tank 1, an electronic scale, a first switching valve, a computer and a sensing system. The water meter under test is clamped between the electric valve and the second switching valve.

[0028] In S1, after the system stabilizes the flow, metering starts. After a time interval ∆t, when the verification water flow rate is reached, metering stops, and the water mass increment in the weighing water tank is ∆m.

[0029] In S2, the computer automatically obtains the density at this temperature according to the temperature sensor and converts it into a volume increment ∆V, and the formula is:

[0030] -- The density of water at temperature t.

[0031] In S3, the computer software calculates the flow rate of this measurement , and the formula is:

[0032] Whether the flow rate in this measurement process is effective is determined by the Q value. When it is invalid, the computer system automatically adjusts the flow rate and re-measures.

[0033] When it is effective in S4, the following calculation and comparison are carried out: The sensor starts timing from obtaining the first pulse of the water meter under test. The pulse interval time is ∆T, and N pulses are obtained, that is, timing stops after the last pulse. The pulse increment is: N - 1, and the pulse equivalent is P.

[0034] In S5, the water volume increment of the water meter under test is , and the formula is:

[0035] Compare after storing the obtained data.

[0036] In S6, the computer suction system automatically calculates the error of the water meter under test , and the formula is:

[0037] The meter inspector reads and determines whether the metering accuracy of the water meter meets the requirements; The device consists of a box, a water pump, a pressure stabilizing tank, an electric valve, a second switching valve, three flow regulating valves, a weighing water tank 1, an electronic scale, a first switching valve, a computer and a sensing system. When the water meter verification platform verifies the water meter, the water meter is clamped between the electric valve and the second switching valve. After the pressure of the pressure stabilizing tank is stabilized by opening the water pump, the electric valve is opened and the second switching valve is opened. According to the different measured flow values, the valves and the switching valves are opened and closed to make the water flowing through the water meter under test remain in the weighing water tank. When the water flow is stable, the computer issues an instruction to record the initial value of the electronic scale and start metering. After a time ∆t, when the over-flow volume exceeds the minimum value required for measurement, the electric valve is closed. The computer reads the final value of the electronic scale and calculates the difference between the final value and the initial value of the electronic scale within the ∆t interval, and then calculates the average flow rate within the ∆t time. This flow rate value is used as the standard value to determine whether the current water meter verification is valid. If it is invalid, the flow rate is automatically adjusted and re-verified; if it is valid, the computer calculates and processes the comparison with the metering value of the water meter, calculates the measurement error of each water meter under test, and then determines whether the measurement accuracy of the water meter under test is within the allowable range.

[0038] Embodiment 2: As Figures 1-9Based on the first embodiment, in order to solve the problem that when water enters the water tank, the water inside the water tank needs to wait for a long time to stabilize before detection can be carried out, the following technical solution is disclosed: A long strip groove 3 is opened on the left side of the weighing water tank 1, and a water inlet pipe 2 is nested inside the long strip groove 3. A disc baffle 4 is provided at the right end of the water inlet pipe 2, and the disc baffle 4 is located outside the long strip groove 3. A fixing plate 5 is fixedly installed on the left side of the weighing water tank 1, and a limiting rod 6 is fixedly installed on the inner side of the fixing plate 5. The middle end of the limiting rod 6 penetrates through the disc baffle 4. A vertical rod 8 is fixedly installed inside the weighing water tank 1, and a floating plate 9 is installed through the surface of the vertical rod 8. A round hole 10 is opened on the surface of the floating plate 9, and the outer side of the floating plate 9 is attached to the inner wall of the weighing water tank 1. The upper end of the vertical rod 8 is installed through a pressure relief plate 11, and an inclined block 12 is fixedly installed on the outer side of the pressure relief plate 11. The outer side of the inclined block 12 corresponds to the inner wall of the weighing water tank 1. A water wheel plate 13 is rotatably installed inside the weighing water tank 1, and the left side of the water wheel plate 13 corresponds to the right outlet of the water inlet pipe 2. A rotating rod 15 is rotatably installed on the inner wall of the weighing water tank 1, and the rear end of the rotating rod 15 is nested and connected with the water wheel plate 13 through a transmission belt 14 and a pulley. A cam 16 is fixedly installed on the surface of the rotating rod 15, and the cam 16 is located below the pressure relief plate 11. A positioning plate 17 is fixedly installed on the inner wall of the weighing water tank 1, and a return spring 18 is fixedly installed between the upper end of the positioning plate 17 and the pressure relief plate 11; When measuring the weighing water tank 1 with an electronic scale, two disc baffles 4 are arranged on the right side of the water inlet pipe 2. The disc baffles 4 block the long slot 3 on the left side of the weighing water tank 1, enabling the water inlet pipe 2 to move up and down along the long slot 3. When the disc baffles 4 move up and down, the limit rods 6 inside the fixed plate 5 limit the disc baffles 4, thereby ensuring that the water inlet pipe 2 can move horizontally up and down, avoiding the weight of the water inlet pipe 2 affecting the weighing of the weighing water tank 1. After weighing, by connecting the outlet valve 7 to an external pipe, the water can be discharged. When the water detected by the water meter enters the interior of the weighing water tank 1 through the water inlet pipe 2, it falls onto the pressure relief plate 11 at the upper end of the vertical rod 8. The pressure relief plate 11 blocks the water, causing the water entering the interior of the weighing water tank 1 to flow along the inner wall of the weighing water tank 1 along the inclined block 12 at the edge of the pressure relief plate 11. The water flowing down from the interior of the weighing water tank 1 enters the interior of the weighing water tank 1 through the circular hole 10 inside the floating plate 9. After the water accumulates to an appropriate amount, it will lift the floating plate 9 upward by buoyancy, causing the floating plate 9 to be located on the water surface, thereby avoiding the water flow impacting the interior of the weighing water tank 1, resulting in long-term water flow shaking and affecting the detection efficiency. At the same time, when water enters through the water inlet pipe 2, the water flow impacts the water wheel plate 13, and the water wheel plate 13 rotates at this time. It can drive the rotating rod 15 at the lower end to rotate through the pulley and the transmission belt 14. When the rotating rod 15 rotates, it can drive the cam 16 to squeeze the pressure relief plate 11. Under the restriction of the return spring 18 at the upper end of the positioning plate 17, the pressure relief plate 11 can move up and down, realizing shaking, promoting the falling speed of the water flow, improving the efficiency, avoiding the water flow from accumulating at the upper end of the pressure relief plate 11, and saving the time of the staff.

[0039] Although the embodiments of the present invention have been shown and described, it will be understood by those of ordinary skill in the art that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principles and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A dynamic weighing and measuring method for a water meter calibration station, comprising S1, measuring water flow quality; S2, obtaining density; S3, measuring flow rate; S4, effective comparison; S5, measured water meter data; S6, error comparison; It is characterized in that The specific steps include: S1. Determine water flow quality After the water flow injected into the weighing water tank (1) is stabilized, the weight of the water flow inside the weighing water tank (1) is obtained under the action of an electronic scale; S2. Get density By calculating the computer data, the increased water flow volume increment is obtained and recorded; S3. Flow measurement The computer software calculates the flow rate of this measurement, and determines whether the measurement result is valid based on the result. If it is invalid, it needs to be measured again; S4. Valid comparison When the calculation result is valid, the sensor obtains the pulse interval from the measured water meter, and obtains the pulse increment and pulse equivalent through multiple pulses; S5. Measured water meter data Calculate the increment of water passing through the measured water meter and record the data after obtaining it; S6. Error comparison The computer system automatically calculates the error of the water meter being tested, and the meter inspector reads the data and determines whether it meets the requirements; The water meter calibration station dynamic weighing measurement includes a box, a water pump, a pressure regulating tank, an electric valve, a second switch valve, three flow regulating valves and a weighing water tank (1), an electronic scale, a switch valve 1 and a computer and a sensor system. The water meter to be tested is clamped between the electric valve and the switch valve 2.

2. A dynamic weighing and measuring method for a water meter calibration station according to claim 1, characterized in that: The system in S1 starts measuring after the flow is stable, and stops measuring after the identification water flow is reached after a time interval of ∆t. The mass increment of the water flow in the weighing water tank is ∆m.

3. A dynamic weighing and measuring method for a water meter calibration station according to claim 1, characterized in that: The computer in S2 automatically obtains the density at the temperature according to the temperature sensor and converts it into a volume increment ∆V, and the formula is: ； --Density of water at temperature t.

4. The dynamic weighing and measuring method for a water meter calibration station according to claim 1 is characterized in that: The computer software in S3 calculates the flow rate of this measurement , and the formula is: ； The Q value determines whether the flow rate during this measurement process is valid. If it is invalid, the computer system automatically adjusts the flow rate and re-measures.

5. The dynamic weighing and measuring method for a water meter calibration station according to claim 1 is characterized in that: When S4 is valid, the following calculation and comparison are performed: The sensor starts timing from the first pulse obtained from the measured water meter. The pulse interval is ∆T. The sensor stops timing after obtaining N pulses, that is, the last pulse. The pulse increment is: N-1, and the pulse equivalent is P.

6. The dynamic weighing and measuring method for a water meter calibration station according to claim 1 is characterized in that: The water volume increment of the measured water meter in S5 is: , and the formula is: ； The obtained data will be stored and compared later.

7. The dynamic weighing and measuring method for a water meter calibration station according to claim 1 is characterized in that: The computer suction system in S6 automatically calculates the error of the measured water meter , and the formula is: ； The meter inspector reads and determines whether the water meter's measurement accuracy meets the requirements.

8. A dynamic weighing and measuring device for a water meter calibration platform for implementing the method of claim 7, characterized in that: The weighing water tank (1) is provided with a long groove (3) on the left side, and a water inlet pipe (2) is nested inside the long groove (3), and a disc baffle (4) is provided at the right end of the water inlet pipe (2), and the disc baffle (4) is located outside the long groove (3). A fixing plate (5) is fixedly installed on the left side of the weighing water tank (1), and a limiting rod (6) is fixedly installed on the inner side of the fixing plate (5), and the middle end of the limiting rod (6) passes through the disc baffle (4).

9. A dynamic weighing and measuring device for a water meter calibration platform according to claim 8, characterized in that: The weighing water tank (1) has a vertical pole (8) fixedly installed inside, and a floating plate (9) is installed through the surface of the vertical pole (8), and a circular hole (10) is opened on the surface of the floating plate (9), and the outer side of the floating plate (9) is in contact with the inner wall of the weighing water tank (1), and a pressure relief plate (11) is installed through the upper end of the vertical pole (8), and an inclined block (12) is fixedly installed on the outer side of the pressure relief plate (11), and the outer side of the inclined block (12) corresponds to the inner wall of the weighing water tank (1).

10. A dynamic weighing and measuring device for a water meter calibration platform according to claim 9, characterized in that: A water wheel plate (13) is rotatably mounted inside the weighing water tank (1), and the left side of the water wheel plate (13) corresponds to the right outlet of the water inlet pipe (2). A rotating rod (15) is rotatably mounted on the inner wall of the weighing water tank (1), and the rear end of the rotating rod (15) is nested and connected with the water wheel plate (13) via a transmission belt (14) and a pulley. A cam (16) is fixedly mounted on the surface of the rotating rod (15), and the cam (16) is located at the lower end of the pressure relief plate (11). A positioning plate (17) is fixedly mounted on the inner wall of the weighing water tank (1), and a return spring (18) is fixedly mounted between the upper end of the positioning plate (17) and the pressure relief plate (11).

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