Electronic scale with adjustable measurement accuracy

[0021] In order to enable those skilled in the art to better understand the technical solutions in the embodiments of the present invention, and to make the above objectives, features, and advantages of the embodiments of the present invention more obvious and understandable, the technical solutions in the embodiments of the present invention are described below with reference to the accompanying drawings. Give further details.

[0022] In the description of the present invention, unless otherwise specified and limited, it should be noted that the term "connection" should be understood in a broad sense, for example, it can be a mechanical connection or an electrical connection, or it can be a connection between two components, which can be It is directly connected or indirectly connected through an intermediary. For those of ordinary skill in the art, the specific meaning of the above-mentioned terms can be understood according to specific circumstances.

[0023] See figure 1 Shown is a block diagram of an embodiment of the electronic scale with adjustable measurement accuracy of the present invention. The electronic scale may include a controller 110, a digital display 120, a first load cell 130, and a second load cell 140 respectively connected to the controller 110, and the measurement accuracy of the first load cell is lower than that of the second load cell. The measurement accuracy of the load cell, the measurement range of the first load cell includes the measurement range of the second load cell; figure 2 As shown, the digital display 120 includes three seven-segment nixie tubes 121, and a light-emitting diode 122 for displaying a decimal point is arranged between every two adjacent seven-segment nixie tubes 121. The controller 110 uses the first The load cell 130 and the second load cell 140 respectively weigh the commodities placed on the weighing platform, and determine whether the ten digits before the decimal point in the weight information detected by the second load cell 140 are zero, If it is, it means that the digital display 120 can fully display the weight information detected by the second load cell 140. At this time, it controls to light up the first light-emitting diode from left to right, and the second load cell detects Starting from the leftmost value of the weight information, it will be displayed on each seven-segment digital tube of the digital display in order from left to right; otherwise, it means that the digital display 120 cannot detect the weight information of the second load cell 140 Perform a full display. At this time, the second light-emitting diode 122 from left to right is controlled to light up, starting from the leftmost value in the weight information detected by the first load cell, and displaying in the order from left to right. On each seven-segment digital tube of the digital display.

[0024] In this embodiment, the measurement accuracy of the second load cell is two digits before the decimal point and two digits after the decimal point, and the measurement accuracy of the first load cell is three digits before the decimal point and one digit after the decimal point. For example, the weight information detected by the first load cell is 12.1, and the weight information detected by the second load cell is 12.14. Because the tens before the decimal point in the weight information detected by the second load cell is not zero, There are only three seven-segment digital tubes in the digital display, and the digital display cannot fully display the weight detected by the second load cell. Therefore, the controller controls the display of the weight information 12.1 detected by the first load cell. For another example, the weight information detected by the first load cell is 2.1, and the weight information detected by the second load cell is 2.14. Since the tens before the decimal point in the weight information detected by the second load cell is not zero, The digital display can fully display the weight detected by the second load cell, so the controller controls to display the weight information 2.14 detected by the second load cell.

[0025] Under normal circumstances, the higher the measurement accuracy of the load cell, the smaller the measurement range. Since the measurement accuracy of the first load cell in the present invention is lower, the measurement range is correspondingly larger. As the measurement range of the electronic scale, the measurement accuracy of the second load cell will decrease due to often exceeding its range during use. Therefore, the measurement range of the electronic scale of the present invention is equal to the second load cell. This can ensure the normal use of the electronic scale. In addition, when the controller only displays the weight information detected by the first load cell, it is obviously only accurate to one decimal place, which will cause the measurement accuracy of the electronic scale to decrease, in order to compensate for the measurement accuracy of the electronic scale , The electronic scale also includes a decimal display button for displaying the second digit after the decimal point. After receiving the pressing signal of the decimal display button, the controller will display the weight information detected by the second weighing sensor. The second digit after the middle decimal point is displayed on the seven-segment digital tube on the far right, which controls the first light-emitting diode from left to right, and controls the left-most seven-segment digital tube and the seven-segment digital tube in the middle. The tube shows zero.

[0026] It can be seen from the above embodiments that the present invention has fewer seven-segment digital tubes in the digital display and cannot meet the display requirements of the load cell. By setting two load cells with different measurement accuracy, the measurement accuracy can be adjusted within the measurement range. The digital display can meet the display requirements of the load cell even when there are fewer seven-segment digital tubes.

[0027] In addition, current electronic scales can easily be modified after being sold. After the traditional electronic scale is modified, it is necessary to manually adjust the actual weight of the scale by pressing the corresponding button on the electronic scale or pressing the corresponding button on the remote control according to the price of the product. Traditional refitted electronic scales are based on manual weight display selection. However, with the rise of unmanned marketing, electronic scales can also be operated by consumers themselves. Without the participation of sales personnel, if you want to cheat, The electronic scale can be further modified to make the ratio between the displayed weight and the actual weight of the electronic scale unique. However, when the price of the product is high, if the only ratio between the displayed weight of the modified scale and the actual weight is larger, it is likely to be found by consumers. When the price of the product is low, if the displayed weight of the modified scale is compared with the actual weight If the only ratio of weight is small, then the cheating profit is small. In order to cheat on products with different prices, it is necessary to set the ratio of the displayed weight to the actual weight according to the price of the product. The higher the price of the product, the lower the weight of the product purchased by consumers, so intuitively When cheating, the ratio of the displayed weight to the actual weight is usually set according to the weight of the product. The heavier the product (the lower the price of the product), the greater the ratio of the displayed weight to the actual weight. It can be seen that, in any case, traditional electronic scales may be modified to cheat. For this reason, two load cells are added in the present invention, and the display mechanism of the two load cells is designed.

[0028] The present invention uses two weighing sensors with completely different measurement accuracy. By comparing the weight information detected by the two weighing sensors on the same commodity, the cheating strength of the electronic scale is determined, so that the weight is displayed according to the weight of the commodity. It is easy to find when the ratio of the actual weight is adjusted. For example, when the actual weight detected by the second load cell is 8.78 kg, and the actual weight detected by the first load cell with lower measurement accuracy is 8.7 kg, if the ratio is 1.2, the second weighing is displayed after cheating The weight detected by the sensor is 8.78*1.2=10.536 (retaining two decimal places, that is 10.53), and it shows that the weight detected by the first load cell is 8.7*1.2=10.44 (retaining one decimal place, that is 10.4) , The two data displayed are 10.53 and 10.4 different. Similarly, if the ratio is 1.01, the weight detected by the second load cell after cheating is 8.78*1.01=8.8678 (retaining two decimal places, which is 8.86), and the weight detected by the first load cell is displayed as 8.7*1.01=8.787 (retain one decimal place, that is, 8.8), the displayed two data 8.86 is similar to 8.8, it can be seen that only when the ratio is small can the display weight of the two load cells in the modified electronic scale be guaranteed Close, illegal personnel can only design the ratio to be small when refitting, which can reduce the intensity of cheating to a certain extent.

[0029] Although the use of two load cells can force illegal personnel to adjust the ratio of the displayed weight to the actual weight to the minimum during the modification, which reduces the cheating force to a certain extent, if the two load cells are used for normal weighing And display the weight information obtained symmetrically, then since the measurement accuracy of the first load cell is less than that of the second load cell, two types of weight information are displayed. On the one hand, consumers are not clear about which weight should be used. There may be a certain error in the two weights, which makes consumers confused. In order to ensure the normal use of the electronic scale, the present invention designs the normal display mechanism and the cheating inspection display mechanism of the electronic scale. As the electronic scale is in use, after the consumer puts the same product on the weighing platform twice, the probability of placing another product of different weight on the weighing platform two consecutive times is very small, so it can This situation is used as a triggering condition for displaying the weight information detected by the first load cell. The triggering condition is simple and reduces the difficulty for consumers to self-check cheating. In addition, since the weight information detected by the second load cell in the tens place before the decimal point is not zero in the present invention, the weight information detected by the first load cell will be directly displayed, so the second load cell cannot be displayed in sequence. The weight information detected by the load cell and the first load cell. Therefore, when checking the cheating intensity, the product of the weight of the product placed on the weighing platform and the maximum ratio of the cheating is less than 10, and the maximum ratio of the cheating is Refers to the maximum value of the displayed weight and the actual weight that will be found to be cheated based on the weight information detected by two load cells with different measurement accuracy.

[0030] Specifically, when verifying the cheating intensity, the controller uses the second weighing sensor to weigh the first product placed on the weighing platform, and calculate the weight of the first product The information is inserted into the queue from the end of the queue. Since the product of the weight of the goods placed on the weighing platform and the maximum ratio of cheating is less than 10, that is, the tens before the decimal point in the weight information obtained after cheating is still zero. When the ten digits before the decimal point in the weight information of the first item is zero, the controller displays the weight information of the first item detected by the second load cell on the digital display; the controller uses The second load cell weighs a second item of merchandise placed on the weighing platform in sequence, and when the tens before the decimal point in the weight information of the second item of merchandise is zero, the The weight information of the second commodity is displayed on the digital display. Since the display of the weight information detected by the first weighing display is triggered, the user will quickly lift the first product after weighing the first product and place it on the weighing platform again. The interval is very long. Short, if the interval is too long, it means that the user is not preparing for cheating strength inspection. Therefore, after the controller displays the weight information of the second item on the digital display, it will judge from weighing the first item Whether the interval between weighing the second product is longer than the corresponding preset time, if it is, it means that the user is not preparing for cheating intensity verification. At this time, the controller clears the characters in the queue and clears the first Second, the weight information of the product is inserted into the queue from the end of the queue. Otherwise, it is determined whether the weight of the second product is equal to the weight of the first product. If it is equal, it means that the user is preparing for the cheating strength test and will The weight information of the second item is inserted into the queue from the end of the queue. If it is not equal, it means that the user is not preparing for cheating strength verification. After the characters in the queue are cleared, the second item is removed The weight information is inserted into the queue from the end of the queue.

[0031] The controller uses the second load cell to weigh a third item of merchandise placed on the weighing platform in sequence, and the ten digits before the decimal point in the weight information of the third item of merchandise are At zero hour, display the weight information of the third product on the digital display, and determine whether the interval from weighing the second product to weighing the third product is longer than the corresponding preset time, if so, it means The user is not preparing for cheating strength verification. After clearing the characters in the queue, insert the weight information of the third product from the end of the queue into the queue; otherwise, determine whether the weight of the third product is The weight of the third product is equal to the weight of the second product. If not, it means that the user is preparing for cheating strength verification. The weight information of the third product is inserted into the queue from the end of the queue. If it is equal, it means that the user is not in the queue. Make preparations for cheating intensity verification, after clearing the characters in the queue, insert the weight information of the third commodity from the end of the queue into the queue.

[0032] The controller uses the second weighing sensor to weigh a fourth item of merchandise placed on the weighing platform in sequence, and the ten digits before the decimal point in the weight information of the fourth item are At zero hour, display the weight information of the fourth item on the digital display, and determine whether the interval from weighing the third item to weighing the fourth item is greater than the corresponding preset duration, if so, then Indicates that the user is not preparing for cheating intensity verification. After clearing the characters in the queue, insert the weight information of the fourth item into the queue from the end of the queue, otherwise, determine the fourth item If the weight of is equal to the weight of the third product, if it is equal, it means that the user is preparing for cheating strength verification and is ready to complete, insert the weight information of the fourth product into the queue from the end of the queue, if not the same , It means that the user is not preparing for cheating intensity verification. After clearing the characters in the queue, the weight information of the fourth commodity is inserted into the queue from the end of the queue.

[0033] The controller makes a real-time judgment on the number of characters in the queue, and when the number of characters in the queue is equal to 4, controls the first weighing sensor to determine the commodity corresponding to the fourth weight information in the queue Perform weighing, and display the weight information of the commodity detected by the first load cell on the digital display; according to the weight information detected by the second load cell and the weight information sequentially displayed on the digital display The weight information detected by the first load cell determines whether the electronic scale has a large amount of cheating.

[0034] When the present invention triggers the display of the weight detected by the first load cell, it does not store the four weight information detected during the triggering process and the detection interval time between two, and only after the fourth weight information is received Each weight information is compared with the interval time, but a queue is introduced. After each weight information is received, it will judge whether the user is preparing for the cheating strength test. Only four products are measured in turn by the user. The weight information detected by the first load cell will be displayed when preparing for the cheating strength inspection. The controller receives the weight information of the fourth item and confirms that the user is also doing cheating strength inspection when weighing the fourth item. After preparation, you only need to insert the weight information of the fourth item into the queue to trigger the display of the weight information detected by the first load cell, so that the first load cell detection can be quickly displayed in the cheating strength test The weight information obtained can improve the user's good experience in cheating verification.

[0035] It can be seen from the above embodiment that the present invention can force illegal personnel to adjust the ratio of the displayed weight to the actual weight to a minimum by installing two load cells, thereby reducing the intensity of cheating to a certain extent; by checking the normal display mechanism and cheating The verification display mechanism is designed to ensure that only the weight information detected by the second load cell with higher measurement accuracy is displayed during normal weighing, and the second load cell and the first load cell detection are displayed in sequence during cheating verification. In this way, while ensuring a good user experience in normal use, a simpler method can be used to check the cheating intensity; by introducing a queue, each time the controller receives the weight information, it will check whether the user is doing it. The behavior of cheating strength inspection preparation is judged. Only when the measurement of four products are in sequence when the user is preparing for cheating strength inspection, will the weight information detected by the first load cell be displayed, and the controller will display the weight information detected by the first load cell. After confirming that the user weighs the fourth product in preparation for cheating, he only needs to insert the weight information of the fourth product into the queue to trigger the weight information detected by the first load cell. By displaying, the weight information detected by the first load cell can be quickly displayed in the cheating intensity test, thereby improving the user's good experience in cheating verification.

[0036] Those skilled in the art will easily think of other embodiments of the present invention after considering the description and practicing the invention disclosed herein. This application is intended to cover any variations, uses, or adaptive changes of the present invention. These variations, uses, or adaptive changes follow the general principles of the present invention and include common knowledge or conventional technical means in the technical field not disclosed by the present invention. . The description and the embodiments are to be regarded as exemplary only, and the true scope and spirit of the present invention are pointed out by the following claims.

[0037] It should be understood that the present invention is not limited to the precise structure described above and shown in the drawings, and various modifications and changes can be made without departing from its scope. The scope of the present invention is only limited by the appended claims.