[0055] (Embodiment 1): This embodiment is a double precision electronic scale, see Figure 1 to Figure 10 As shown, it includes an object carrier 1, a display screen 11, an adjustment switch 12, four first-accuracy weighing components for supporting the object carrier 2, and four first-accuracy weighing components for supporting the object carrier and The second-precision weighing assembly 3, and four force guides 4 for transmitting the pressure it receives to the second-precision weighing assembly.
[0056] In this embodiment, the specific structure of the second-precision weighing assembly 3 is as follows: including a holder 34 with a receiving slot 33 and a card slot, a second-precision load cell 31 arranged in the card slot, and a second The supporting leg 32 on the precision load cell 31, the reed cover 35 covering the bottom opening of the accommodating groove 33 and having a central positioning hole 351; the supporting leg 32 in this embodiment includes a cylindrical metal supporting block 321 and bonded on The anti-skid pad 322 at the bottom end of the support block 321 is arranged in the central positioning hole of the spring cover, and the anti-skid pad is lowered from the spring cover. In this embodiment, the bottom end of the anti-skid pad serves as the bottom end of the supporting foot, which is the lowest end of this embodiment. The specific structure of the spring 35 includes an inner ring, an outer ring, and multiple spiral arms connecting the inner ring and the outer ring. The center positioning hole is provided on the inner ring, and its function is to locate the metal support block so that the metal support block The pressure on itself is transmitted vertically downward, and it also prevents the card holder from directly transmitting the pressure on itself to the metal support block through the reed cover. Since its structure and technical effects are already well-known to those skilled in the art, this embodiment will not do it anymore. Go into details.
[0057] The force guiding member 4 in this embodiment includes a bottom wall 41 provided with a clamping groove, a tubular support wall 42 enclosing a cavity, and a positioning surface provided on the inner wall of the tubular support wall. The positioning surface is a tubular support The wall 42 is a horizontal annular surface arranged radially, and the bottom wall 41 of the force guiding member is crimped and arranged on the top end of the holder 34.
[0058] In this embodiment, the top end of the tubular support wall 42 serves as the guiding force support portion 40, and the bottom wall of the load board serves as the guiding force crimping portion 10.
[0059] In this embodiment, each first-precision weighing assembly 2 is arranged in a cavity of a corresponding force guide 4, and its specific structure is as follows: including an elastic support 21, a first-precision load cell 22, and a center limiting hole 241 elastic cover 24; the elastic support includes a threaded spring 211, an upper support 212 arranged at the top end of the thread spring, a lower support 213 arranged at the bottom end of the thread spring, the thread spring and the upper support and the lower support respectively pass Connected by fastening screws; the outer peripheral edge of the elastic cover is crimped and fixed on the positioning surface of the force guide, the lower support 213 is arranged in the center limit hole 241 of the elastic cover, and the upper support is glued and fixed to the load On the bottom wall of the board. The specific structure and technical effects of the elastic cover 24 are similar to the above-mentioned reed cover 35, and also include an inner ring, an outer ring, and a plurality of spiral arms connecting the inner ring and the outer ring. The center limiting hole 241 is provided on the inner ring. The function is to locate the lower support member located in the center limit hole, so that the lower support member can transmit its own pressure vertically downward, and also to prevent the lower support member from directly transmitting its own pressure to the force guide through the elastic cover Since the structure and technical effects of the tubular support wall are already well known to those skilled in the art, it will not be described in detail in this embodiment.
[0060] The first-precision load cell 22 is arranged in the clamping groove of the bottom wall 41 of the force guide member, and the bottom wall of the lower support member is crimped on the first-precision load cell.
[0061] In this embodiment, see Figure 7 with Figure 8 As shown, the first-precision load cell 22 is a commonly used weighing module for kitchens, with a range of 0 to 20 kilograms and a division value of 1 gram; the first-precision load cell includes a first fixing part 221, a first The force-bearing deformation part 222 and the first resistance strain gauge 223. The first fixing part of the first precision load cell is clamped and fixed in the clamp groove of the bottom wall 41 of the force guide member, and the lower support member of the elastic support member is pressed against the first force-bearing deformation part.
[0062] In this embodiment, see Picture 9 with Picture 10 As shown, the second-precision load cell 31 is a commonly used human body weight weighing sensor, and its range is 5 kg to 180 kg, and the graduation value (also called accuracy) is 100 g; the second-precision load cell 31 includes The second fixing portion 311, the second force-bearing deformation portion 312 and the second resistance strain gauge 313. The second fixing portion 311 of the second precision load cell is clamped and fixed in the clamping slot of the clamping base 34, and the supporting block 321 is abutted on the second force-bearing deformation portion 312.
[0063] In this embodiment, the first-precision load cell and the second-precision load cell used can be force sensors that are widely circulated and relatively inexpensive on the market, thereby effectively reducing manufacturing costs.
[0064] In the free state, that is, when no load-bearing object is placed on the load board, the top end of the upper support member in the elastic support is higher than the top end of the tubular support wall 42 in the guide member, so that the bottom wall 10 of the load board is higher than the guide member. The top of the force piece. When the load-bearing object is placed on the load board and the load weight is less than 20 kg, by selecting the appropriate threaded spring, the bottom wall of the load board can always be higher than the guiding part during the downward movement of the load board. And within the elastic deformation range of the threaded spring. The load board transfers all the pressure of the load-bearing object to the first precision load cell through the elastic support, and then to the second precision load cell. At this time, the first precision can be displayed on the display screen by adjusting the switch or the intelligent control circuit The weight value of the weighing component is ignored, and the weighing value of the second-precision weighing component is ignored. The weighing accuracy in this process can reach 1 gram, so this embodiment can be used as a kitchen electronic scale.
[0065] When the weight of the loaded object exceeds 20 kg, the load board will move down until it is crimped on the guiding member. Specifically, the bottom wall of the load board serving as the guiding crimping portion 10 is simultaneously crimped on the guiding supporting portion 40 on the top end of the tubular support wall 42 and on the upper support in the first precision weighing assembly. Its working principle is: the load plate transmits part of the pressure of the load-bearing object to the first precision load cell through the elastic support, and then to the second-precision load cell; at the same time, the load board also passes the remaining pressure of the load The force guiding member is directly transmitted to the second-precision load cell. Since the deformation of the elastic support member will not increase during this process, the partial pressure transmitted to the first-precision load cell through the elastic support member will not increase any more. Large, by selecting an appropriate thread spring, this part of the pressure will not exceed the elastic deformation bearing range of the first precision load cell, that is, the first precision load cell will not be damaged. At this time, by adjusting the switch or intelligent control circuit, the display can display the weight value of the second-precision weighing component, ignoring the weighing value of the first-precision weighing component. The weighing accuracy in this process can reach 100 grams. Therefore, this embodiment can also be used as a weight electronic scale.
