A direct reading measurement method and measurement system for the last character wheel

Abstract

This invention discloses a direct-reading measurement method and system for the last digit wheel. A last-digit sensor is installed on the last digit scale of the digit wheel to acquire the scale value of the last digit. The last-digit sensor is connected to a microprocessor, which acquires the maximum allowable flow rate Q of the measurement device. max m 3 / h, set the maximum change value N of the sampling interval, and thus obtain the sampling interval T min of the last digit sensor of the digit wheel. By comparing the value changes of two adjacent moments, the positive or negative value of the measurement device is determined. Beneficial effects: The overall design is ingenious, requiring no changes to the existing digit wheel structure, achieving high-precision, low-cost counting with low energy consumption.

Description

Technical Field

[0001] The invention belongs to the technical field of character wheel measurement, and in particular relates to a direct reading measurement method and a measurement system for a last character wheel. Background Art

[0002] The method of counting character wheels currently used in metering equipment on the market is mainly to equip each character wheel with a set of sensors to directly read the real-time value of the character wheel. When the character wheel value needs to be read, it is directly powered on, and the electronic measurement value can be directly obtained through the sensor, realizing remote reading of the metering equipment. However, this method requires an additional set of sensors for each additional character wheel, and the increase in sensors brings more design costs.

[0003] With the development of wireless meter reading in recent years, metering equipment is equipped with batteries, so the equipment can be in sleep mode without losing power. Along with this, pulse metering methods have emerged. This method generates an electronic pulse during one mechanical rotation during the metering process to achieve cumulative measurement of electronic metering values. It cannot achieve positive and reverse measurement, but due to intermittent detection and measurement, pulse loss may occur, resulting in inconsistency between electronic and mechanical measurement.

[0004] Therefore, it is necessary to develop a method with low cost, which can realize forward and reverse metering and higher consistency between electronic metering and mechanical metering, to solve the defects in the existing technology. Summary of the invention

[0005] In view of the deficiencies of the above-mentioned prior art, the present invention proposes a direct-reading metering method and a metering system for the last digit wheel. It only needs to install a scale sensor at the last digit of the wheel to achieve accurate reading of the entire metering equipment. Regardless of whether the measured equipment is positively accumulated or reversely accumulated, the present invention can achieve precise metering, effectively reduce the metering cost, and simplify the installation difficulty of sensors in the metering equipment.

[0006] A method for direct reading measurement of the last character wheel, the key technology of which is: the specific steps are:

[0007] Pre-processing settings: The microprocessor obtains the maximum allowable flow rate Q of the metering device max m 3 / h, set the maximum change value N of the acquisition interval time, so as to obtain the acquisition interval time Tmin of the last digit sensor of the character wheel;

[0008] Step 1: The microprocessor obtains the initial setting values ​​of all the character wheels of the measuring equipment and the reading V of the last digit sensor of the character wheel i ; Wherein, i is the number of times the microprocessor reads the last digit sensor of the character wheel, let i = 0;

[0009] Step 2: After the microprocessor waits for the last digit sensor of the character wheel to collect the interval time T, set i=i+1; and obtain the reading V of the last digit sensor of the character wheel at the current moment i ;

[0010] Step 3: The microprocessor compares the current reading V of the last digit sensor of the character wheel i And the reading V of the last digit sensor of the character wheel at the previous time i-1 ;

[0011] Step 31: If V i =V i-1 ; The cumulative value of the measuring device wheel remains unchanged, and the process returns to step 2; otherwise, the process proceeds to step 32;

[0012] Step 32: If V i >V i-1 , go to step 4; otherwise go to step 33;

[0013] Step 33: If V i <V i-1 , go to step 5;

[0014] Step 4:

[0015] Step 41: If V i -V i-1 ≤N, the above microprocessor performs forward measurement and returns to step 2; otherwise, it goes to step 42;

[0016] Step 42: If N<V i -V i-1 <(10-N), an over-limit error is prompted and the process returns to step 2; otherwise, the process goes to step 43;

[0017] Step 43: If V i -V i-1 ≥(10-N), reverse measurement, the penultimate digit of the character wheel cumulative value is reduced by one, and the reading of the last digit sensor of the character wheel at the current moment is V i Replace the last digit of the accumulated value of the character wheel and return to step 2;

[0018] Step 5:

[0019] Step 51: If V i-1 -V i ≤N, reverse measurement, V i Replace the last digit of the accumulated value of the character wheel and return to step 2; otherwise, go to step 52;

[0020] Step 52: If N<V i-1 -V i <(10-N), an over-limit error is prompted and the process returns to step 2; otherwise, the process goes to step 53;

[0021] Step 53: If V i-1 -V i ≥(10-N), forward measurement, the second to last digit value is increased by 1, the reading of the last digit sensor of the character wheel at the current moment is V i Replace the last digit of the accumulated value of the character wheel and return to step 2.

[0022] Through the above design, it is only necessary to install a scale sensor on the last character wheel, obtain the scale reading, and compare and calculate with the reading of the last detection to realize data verification and intelligent and accurate counting. With one sensor, the measurement and counting can be done, and it is not easy to make mistakes. Compared with the metering equipment in the prior art that uses at least two sensors for detection and counting, the design cost is lower, and according to the set maximum change value of the collection interval time and the maximum allowable flow rate, the collection interval time range of the last digit sensor of the character wheel can be designed. By comparing the numerical values ​​collected before and after, it can be judged whether the measurement is forward or reverse counting, which can not only realize accurate counting, but also distinguish between positive and reverse counting. And the use of one sensor for data collection and transmission effectively reduces the power consumption of the entire device and prolongs the working time of the battery. The overall design is ingenious, and there is no need to change the existing character wheel structure, so as to achieve high-precision, low-cost counting and low energy consumption.

[0023] Furthermore, the maximum allowable flow rate Q max , the maximum change value N of the collection interval time and the collection interval time T of the last digit sensor of the character wheel exist: the collection interval time T of the last digit sensor of the character wheel is not greater than

[0024] The maximum permissible flow rate Q max It is the maximum allowable flow rate of the metering equipment at the corresponding caliber.

[0025] By adopting the above scheme, the sensor collection interval is designed according to the maximum allowable flow rate of the metering equipment and the maximum change value N of the collection interval, so that the change value within the sensor collection interval is within the set maximum change value. Then, between the two collection moments, the change of the last digit is also within the predictable range. Based on the absolute value of the increment of the last digit, it can be calculated whether the increment at the two moments is positive or reverse.

[0026] It should be noted that when actually selecting the value of the last digit sensor collection interval T of the character wheel, the value should theoretically be selected as small as possible under the condition of energy consumption. The value of T is smaller, because the smaller the value of T is, the larger the value of Q can be allowed by the metering equipment for correct measurement. maxThe flow rate through the metering device is thus prevented from exceeding the maximum change value N during the collection interval, which may lead to over-limit errors and metering errors.

[0027] When the microprocessor prompts an over-limit error and issues a metering maintenance warning, it means that a metering error has occurred in the electronic metering and the staff needs to check and maintain it on site.

[0028] According to a further technical solution, when decimal counting is adopted, the last digit of the character wheel includes 10 scales, and is engraved with 10 values ​​0-9 in sequence.

[0029] In a further technical solution, for decimal counting, the maximum variation value N of the acquisition interval is less than 5. The maximum variation value needs to be considered when designing the sensor acquisition interval T.

[0030] A direct reading metering system for a last digit wheel, the key technology of which is: comprising a last digit sensor for a word wheel and a word wheel, wherein a detection end of the last digit sensor for the word wheel is aligned with the scale of the last digit of the word wheel, the last digit sensor for the word wheel is connected to a microprocessor, the microprocessor is used to obtain the reading of the last digit sensor for the word wheel in real time and measure the metering equipment, and a data transmitter is connected to the data sending end of the microprocessor.

[0031] By adopting the above scheme, the metering equipment can realize the collection of wheel values ​​based on the metering system, realize metering and counting through the microprocessor, and can also send data remotely to request assistance or maintenance when a fault occurs. The system is simple and the metering cost is low.

[0032] Beneficial effects of the present invention:

[0033] (1) No matter how many character wheels there are in the mechanical meter, only one set of sensors that read the last character wheel is needed to achieve accurate counting, avoiding the need to design and set up multiple sets of sensors. Only one set of sensors can be used to complete the data collection, which reduces the equipment cost and makes the sensor installation easier.

[0034] (2) Regardless of whether the metering device is forward metering or reverse metering, the present invention can identify and realize the correct accumulation of electronic metering and keep it consistent with the reading of the mechanical metering wheel.

[0035] (3) The metering equipment uses the maximum time interval T within a reasonable range to read the value of the last digit wheel, which can save energy to the maximum extent and ensure that electronic metering can be correctly achieved before the battery energy is exhausted. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] Figure 1 It is a schematic flow chart of the metering method of the present invention;

[0037] Figure 2This is a schematic diagram of the numerical signal acquisition and transmission of the present invention. DETAILED DESCRIPTION

[0038] The present invention will be further described in detail below in conjunction with the accompanying drawings.

[0039] A method for direct reading measurement of the last character wheel, combined with Figure 1 As shown, the specific steps are:

[0040] Pre-processing settings: The microprocessor obtains the maximum allowable flow rate Q of the metering device max m 3 / h, set the maximum change value N of the acquisition interval time, so as to obtain the acquisition interval time Tmin of the last digit sensor of the character wheel;

[0041] In this embodiment, the maximum allowable flow rate Q max , the maximum change value N of the collection interval time and the collection interval time T of the last digit sensor of the character wheel exist: the collection interval time T of the last digit sensor of the character wheel is not greater than The maximum permissible flow rate Q max It is the maximum allowable flow rate of the metering equipment at the corresponding caliber.

[0042] In this embodiment, the character wheel includes 10 scales, and is engraved with 10 values ​​0-9 in sequence. Decimal counting is adopted.

[0043] In this embodiment, the maximum change value N of the collection interval time is an integer less than 5.

[0044] In this embodiment, the maximum allowable flow rate Q is set max =5m 3 / h; N = 3

[0045] Then the sensor collection interval T is no greater than The number of

[0046] In this embodiment, the last digit sensor of the character wheel collects the interval time T = 20 minutes;

[0047] See also Figure 1 , the specific steps are:

[0048] Step 1: The microprocessor obtains the initial setting values ​​of all the character wheels of the measuring equipment and the reading V of the last digit sensor of the character wheel i ; Wherein, i is the number of times the microprocessor reads the last digit sensor of the character wheel, let i = 0;

[0049] Step 2: After the microprocessor waits for the last digit sensor of the character wheel to collect the interval time T, set i=i+1; and obtain the reading V of the last digit sensor of the character wheel at the current moment i ;

[0050] Step 3: The microprocessor compares the current reading V of the last digit sensor of the character wheel i And the reading V of the last digit sensor of the character wheel at the previous time i-1 ;

[0051] Step 31: If V i =V i-1 ; The cumulative value of the measuring device wheel remains unchanged, and the process returns to step 2; otherwise, the process proceeds to step 32;

[0052] Step 32: If V i >V i-1 , go to step 4; otherwise go to step 33;

[0053] Step 33: If V i <V i-1 , go to step 5;

[0054] Step 4:

[0055] Step 41: If V i -V i-1 ≤N, the above microprocessor performs forward measurement and returns to step 2; otherwise, it goes to step 42;

[0056] Step 42: If N<V i -V i-1 <(10-N), an over-limit error is prompted and the process returns to step 2; otherwise, the process goes to step 43;

[0057] Step 43: If V i -V i-1 ≥(10-N), reverse measurement, the penultimate digit of the character wheel cumulative value is reduced by one, and the reading of the last digit sensor of the character wheel at the current moment is V i Replace the last digit of the accumulated value of the character wheel and return to step 2;

[0058] Step 5:

[0059] Step 51: If V i-1 -V i ≤N, reverse measurement, V i Replace the last digit of the accumulated value of the character wheel and return to step 2; otherwise, go to step 52;

[0060] Step 52: If N<V i-1 -V i <(10-N), an over-limit error is prompted and the process returns to step 2; otherwise, the process goes to step 53;

[0061] Step 53: If V i-1 -V i≥(10-N), forward measurement, the second to last digit value is increased by 1, the reading of the last digit sensor of the character wheel at the current moment is V i Replace the last digit of the accumulated value of the character wheel and return to step 2.

[0062] In this embodiment, when the microprocessor performs metering and prompts an over-limit error, if the metering device has an over-limit error for the first time, the microprocessor sends a last digit acquisition control signal to reacquire the reading of the last digit sensor of the character wheel. If there is no over-limit error in the future, it is possible that there is a problem with the previous sensor acquisition, but there is no over-limit error in the future, so the metering synchronization can be maintained. However, if there are still over-limit errors for multiple consecutive times, there are two situations that can be predicted: the first is that the flow rate within the sensor acquisition interval time T is greater than the maximum allowable flow rate Q designed max ; The second is that the sensor fails.

[0063] If the metering device prompts that the number of over-limit errors is greater than one, a metering maintenance warning is issued. After the manual reading value of the metering device is obtained and the manual reading value of the metering device is set as the initial setting value of all character wheels, step 1 is entered.

[0064] In this embodiment, the design i is 0 to 5 corresponding to the count of the time data to explain the design of the present invention, specifically: the initial setting value of all the character wheels of the microprocessor metering device is 0001006, V0 = 6; V1 = 9; V2 = 0; V3 = 8; V4 = 1; V5 = 5; N = 3

[0065] The specific cumulative count is:

[0066] 0-1 moment: V1>V0, V1-V0=3=N; the microprocessor performs forward measurement;

[0067] 1-2 moment: V2<V1, V2-V1=9>(10-N); the microprocessor performs forward measurement; the penultimate digit value of the character wheel cumulative value is increased by 1, and the reading V2 of the last digit sensor of the character wheel at the current moment replaces the last digit value of the character wheel cumulative value;

[0068] 2-3 moment: V3>V2, V3-V2=8>(10-N); the microprocessor performs reverse measurement, the penultimate digit value of the character wheel cumulative value is reduced by one, and the reading V3 of the last digit sensor of the character wheel at the current moment replaces the last digit value of the character wheel cumulative value;

[0069] 3-4 moment: V4<V3; V3-V4=7=10-N; the microprocessor performs forward measurement, the second to last digit value is increased by 1, and the reading V4 of the last digit sensor of the character wheel at the current moment replaces the last digit value of the character wheel cumulative value

[0070] At 4-5: V5>V4; N<V5-V4<10-N; the microprocessor prompts an over-limit error, and does not measure but retains the last digit of the moment.

[0071] A direct reading metering system for the last digit wheel, see Figure 2 , including a character wheel last digit sensor and a character wheel, wherein the detection end of the character wheel last digit sensor is aligned with the scale of the last digit of the character wheel, the character wheel last digit sensor is connected to a microprocessor, the microprocessor is used to obtain the reading of the character wheel last digit sensor in real time and measure the measuring equipment, and the data sending end of the microprocessor is connected to a data transmitter.

[0072] The above are only preferred implementations of the present invention. It should be pointed out that a number of modifications and improved technical solutions made by those skilled in the art without departing from the technical solution should also be deemed to fall within the scope of protection required by the claims.

Claims

1. A method for direct reading measurement of a last digit wheel, characterized in that: The specific steps are: Pre-processing settings: The microprocessor obtains the maximum allowable flow rate Q of the metering device max m 3 / h, set the maximum change value N of the acquisition interval time, so as to obtain the acquisition interval time Tmin of the last digit sensor of the character wheel; Step 1: The microprocessor obtains the initial setting values ​​of all the character wheels of the measuring equipment and the reading V of the last digit sensor of the character wheel i ; Wherein, i is the number of times the microprocessor reads the last digit sensor of the character wheel, let i = 0; Step 2: After the microprocessor waits for the last digit sensor of the character wheel to collect the interval time T, set i=i+1; and obtain the reading V of the last digit sensor of the character wheel at the current moment i ; Step 3: The microprocessor compares the current reading V of the last digit sensor of the character wheel i And the reading V of the last digit sensor of the character wheel at the previous time i-1 ; Step 31: If V i =V i-1 ; The cumulative value of the measuring device wheel remains unchanged, and the process returns to step 2; otherwise, the process proceeds to step 32; Step 32: If V i >V i-1 , go to step 4; otherwise go to step 33; Step 33: If V i <V i-1 , go to step 5; Step 4: Step 41: If V i -V i-1 ≤N, the above microprocessor performs forward measurement and returns to step 2; otherwise, it goes to step 42; Step 42: If N<V i -V i-1 <(10-N), the microprocessor prompts an over-limit error and returns to step 2; otherwise, it goes to step 43; Step 43: If V i -V i-1 ≥(10-N), reverse measurement, the penultimate digit of the character wheel cumulative value is reduced by one, and the reading of the last digit sensor of the character wheel at the current moment is V i Replace the last digit of the accumulated value of the character wheel and return to step 2; Step 5: Step 51: If V i-1 -V i ≤N, reverse measurement, V i Replace the last digit of the accumulated value of the character wheel and return to step 2; otherwise, go to step 52; Step 52: If N<V i-1 -V i <(10-N), the microprocessor prompts an over-limit error and returns to step 2; otherwise, it goes to step 53; Step 53: If V i-1 -V i ≥(10-N), forward measurement, the second to last digit value is increased by 1, the reading of the last digit sensor of the character wheel at the current moment is V i Replace the last digit of the accumulated value of the character wheel and return to step 2.

2. A method for direct reading measurement of a last digit wheel according to claim 1, characterized in that: The maximum permissible flow rate Q max , the maximum change value N of the collection interval time and the collection interval time T of the last digit sensor of the character wheel exist: the collection interval time T of the last digit sensor of the character wheel is not greater than The maximum permissible flow rate Q max It is the maximum allowable flow rate of the metering equipment at the corresponding caliber.

3. A method for direct reading measurement of a last digit wheel according to claim 2, characterized in that: The last digit of the character wheel includes 10 scales, and is engraved with 10 values ​​0-9 in sequence.

4. A method for direct reading measurement of a last digit wheel according to claim 2, characterized in that: The maximum change value N of the collection interval time is an integer less than 5.

5. A terminal wheel direct reading metering system for implementing a terminal wheel direct reading metering method according to claim 1, characterized in that: The invention comprises a character wheel last digit sensor and a character wheel, wherein a detection end of the character wheel last digit sensor is aligned with the scale of the last digit of the character wheel, the character wheel last digit sensor is connected with a microprocessor, the microprocessor is used for obtaining the reading of the character wheel last digit sensor in real time and measuring the measuring equipment, and a data transmitter is connected with a data transmitter at a data sending end of the microprocessor.

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