Intelligent double-step weighing electronic scale

Abstract

The invention discloses an intelligent double-step weighing electronic scale, which belongs to the technical field of measuring instruments and comprises an objective table, a base, a reset assembly, a measuring seat, a weighing assembly and a pressing assembly. And the conversion assembly is arranged on the objective table and is used for enabling the pressing assembly to be alternately matched with the two weighing assemblies after the objective table moves downwards to a fixed stroke. An object is placed on the objective table, the objective table moves towards the base after being pressed, the pressing assembly is matched with the high-precision weighing assembly to weigh the object, small-range high-precision object weighing is achieved, when the object is heavy, the downward moving stroke of the objective table is large, the conversion assembly drives the pressing assembly to act, and therefore the object can be accurately weighed. According to the technical scheme, the pressing assembly is matched with the low-precision weighing assembly instead of being matched with the high-precision weighing assembly, so that wide-range low-precision object weighing is achieved, and in conclusion, the weighing precision is automatically adjusted according to the object weight.

Description

Technical Field

[0001] The invention belongs to the technical field of measuring instruments, and in particular relates to an intelligent double-stage weighing electronic scale. Background Art

[0002] Electronic scales are a type of weighing instrument. Weighing instruments are tools that use Hooke's law or the principle of lever balance to measure the mass of an object. According to the structural principle, they can be divided into three categories: mechanical scales, electronic scales, and electromechanical combined scales. Electronic scales are mainly composed of three parts: a load-bearing system (such as a scale pan, a scale body), a force conversion system (such as a lever force transmission system, a sensor), and a value indicating system (such as a dial, an electronic display instrument).

[0003] The electronic scales currently used usually use strain gauge weighing sensors to detect the weight of items. The working principle is to apply force to the load platform of the electronic scale so that the force of the load platform is dispersed to the strain gauges of each strain gauge weighing sensor. The strain gauges are then deformed, causing their resistance values ​​to change. The resistance values ​​of each strain gauge are then converted into signals through the PCB circuit board to generate weight data and display it on the display screen. However, since the accuracy of the strain gauge is fixed within a range after leaving the factory, when it is necessary to weigh two items with a large difference in weight accuracy, such as items with a weight accuracy of 1g and an accuracy of Kg, a strain gauge with a fixed accuracy may not meet the above weighing requirements. Therefore, it is necessary to design an electronic scale with at least two measurement accuracies to meet the weighing needs in the prior art. Summary of the invention

[0004] The technical problem to be solved by the present invention is to overcome the disadvantages of the above-mentioned prior art and provide an intelligent dual-stage weighing electronic scale.

[0005] The technical solution adopted to solve the above technical problems is:

[0006] An intelligent dual-stage weighing electronic scale, comprising a loading platform, and further comprising:

[0007] A base connected to the stage, wherein a plurality of reset components are arranged between the base and the bottom of the stage, and the reset components are used to make the stage move relative to the base after being subjected to pressure, and after the pressure disappears, the reset components drive the stage to move in a direction away from the base;

[0008] A plurality of metering seats are evenly connected to the inner bottom wall of the base, the metering seats are hollow inside and two weighing components with different precisions are installed in sequence from top to bottom in the inner cavity, and a pressing component is provided on the metering seats;

[0009] A conversion assembly is arranged on the loading platform, and the conversion assembly is used to make the clamping assembly cooperate with the two weighing assemblies alternately after the loading platform moves downward to a fixed stroke.

[0010] Through the above technical scheme, the item is placed on the loading platform. After the loading platform is pressed, it will move toward the base, so that the clamping component will first cooperate with the high-precision weighing component to weigh, so as to achieve small-scale high-precision weighing of items. When the weight of the item is large, the downward movement of the loading platform is large, so that the conversion component drives the clamping component to move, so that the clamping component cancels the cooperation with the high-precision weighing component and instead cooperates with the low-precision weighing component to achieve large-scale low-precision weighing of items. In summary, this technical scheme realizes the automatic adjustment of the weighing accuracy according to the weight of the item.

[0011] Furthermore, the reset assembly includes a fixed seat connected to the inner bottom wall of the base, a telescopic column is coaxially penetrated through the fixed seat, the telescopic column slides freely in the fixed seat, a variable damping elastic member is installed in the fixed seat, and the variable damping elastic member is used to generate a resistance that is first small and then large to the downward movement of the telescopic column.

[0012] Through the above technical scheme, the variable damping elastic part elastically presses against the telescopic column upward, so that the loading platform can move upward and reset after the object is removed. In addition, due to the elastic pressing force of the variable damping elastic part on the loading platform during small-scale high-precision measurement, it will affect the measurement accuracy of the weighing component to a certain extent. Therefore, the variable damping elastic part is arranged to first generate a small resistance when the telescopic column moves downward. On the one hand, it is convenient for the loading platform to move upward and reset after being compressed. On the other hand, it reduces the influence on the weighing accuracy of the weighing component to a certain extent. When a large-scale weighing is performed, the resistance of the variable damping elastic part to the loading platform becomes larger, so as to avoid the heavy weight of the object, which causes the loading platform to move down too quickly after the object is placed on the loading platform, thereby causing an impact on the weighing component and other components.

[0013] Furthermore, the variable damping elastic member includes a heavy-loaded spring vertically installed in the fixed seat, the upper end of the heavy-loaded spring is fixedly connected to a mounting block, the downward end of the telescopic column is provided with a mounting hole for the mounting block to engage, the mounting block slides freely up and down in the mounting hole, and the upper end surface of the mounting block is fixedly connected to a light-loaded spring, and the upper end of the light-loaded spring elastically presses against the inner top wall of the mounting hole.

[0014] Through the above technical solution, the light-loaded spring has less resistance to the downward movement of the loading platform, so that when performing small-range high-precision weighing measurements, the impact on the accuracy of weighing is small. After the small weight object is placed on the loading platform, the heavy-loaded spring has a greater elastic supporting force on the loading platform, and its elastic deformation can be ignored. At this time, the light-loaded spring will buffer the pressure on the loading platform.

[0015] Furthermore, a limit pin is fixedly connected to the periphery of the lower end of the telescopic column, and a limit groove is formed on the outer wall of the fixing seat for the limit pin to freely pass through for upward and downward movement.

[0016] Through the above technical solution, the limiting pin slides in the limiting groove, so that the telescopic column will not be separated from the fixing seat when sliding in the inner cavity of the fixing seat.

[0017] Furthermore, the weighing assembly includes a protrusion fixedly connected to the outer wall of the metering seat, the interior of the protrusion is hollow and communicates with the inner cavity of the metering seat, the inner bottom wall of the metering seat and the inner bottom wall of the protrusion are each fixedly connected with a bearing block, the upper end surface of the bearing block is fixedly connected with a stress deformation plate, and the top surfaces of the two stress deformation plates are respectively embedded with a high-precision strain gauge and a low-precision strain gauge, and the high-precision strain gauge and the low-precision strain gauge are respectively arranged in the inner cavity of the protrusion and the inner cavity of the metering seat.

[0018] Through the above technical solution, high-precision strain gauges correspond to the weighing needs of small-range high-precision items, and low-precision strain gauges correspond to the weighing needs of large-range low-precision items, meeting the accuracy requirements for weighing items with large weight differences.

[0019] Furthermore, the clamping assembly includes a clamping column coaxially penetrated on the metering seat, the clamping column slides freely in the metering seat, the interior of the clamping column is hollow and a floating column is telescopically installed, a connecting block is fixedly connected to the periphery of the lower end of the floating column, a through groove is opened on the periphery of the clamping column for the connecting block to move freely up and down, one end of the connecting block passing through the clamping column is fixedly connected to a clamping block, and the clamping block extends to the inner cavity of the protrusion.

[0020] Through the above technical solution, when the bottom of the clamping column contacts the low-precision strain gauge, the clamping block will be out of contact with the low-precision strain gauge, thus meeting the needs of weighing in different ranges.

[0021] Furthermore, the conversion component includes a sliding block engaged in a sliding cavity provided in the worktable, the sliding block slides freely horizontally in the sliding cavity, a clearance groove penetrating the sliding cavity is provided at the bottom of the worktable, a driving pin is passed through the upper end of the floating column, a strip groove is provided at the bottom of the sliding block for the upper end of the floating column to pass freely, a special-shaped groove penetrating the strip groove is provided on the side wall of the sliding block, the special-shaped groove includes a first sliding groove, an oblique groove and a second sliding groove connected end to end in the direction away from the center line of the worktable, the first sliding groove is located below the second sliding groove, the driving pin is inserted into the special-shaped groove and slides freely in the first sliding groove, the oblique groove and the second sliding groove, and a driving unit for driving the sliding block to slide in the sliding cavity is provided at the bottom of the worktable.

[0022] Through the above technical scheme, when weighing small-scale high-precision objects, the sliding block will move horizontally. At this time, the sliding pin will slide in the second sliding groove and will not slide into the inclined groove, so that the floating column is stationary relative to the clamping column, thereby making the clamping block contact with the stress deformation plate corresponding to the high-precision strain gauge, and can weigh small-scale high-precision objects. When weighing large-scale low-precision objects, the sliding block continues to move, and makes the sliding pin slide from the second sliding groove to the inclined groove, and then continues to slide into the first sliding groove. At this time, the floating column moves upward relative to the clamping column, thereby driving the clamping block to move upward, and the amplitude of the upward movement is greater than the amplitude of the downward movement of the stage, thereby making the clamping block disengage from the stress deformation plate corresponding to the high-precision strain gauge, and making the bottom of the clamping column contact with the stress deformation plate corresponding to the low-precision strain gauge, thereby making it possible to weigh large-scale low-precision objects.

[0023] Furthermore, the driving unit includes a fixed sleeve connected to the inner bottom wall of the base, the bottom of the loading platform is vertically rotatably connected with a rotating sleeve, the fixed sleeve is inserted into the rotating sleeve and slides freely, a ball is rotatably embedded in the periphery of the upper end of the fixed sleeve, a spiral rolling groove for the ball to engage is provided on the inner wall of the rotating sleeve, the ball rotates freely in the spiral rolling groove, a plurality of hinge rods are hinged on the periphery of the rotating sleeve, a rotating pin is vertically fixed at one end of the sliding block, a waist-shaped hole is provided on the bottom surface of the loading platform for the rotating pin to move freely through horizontally, and one end of the hinge rod away from the rotating sleeve is correspondingly hinged to the end of the rotating pin.

[0024] Through the above technical solution, when the loading platform moves downward, the rotating sleeve will move downward relative to the fixed sleeve, so that the ball will roll in the spiral rolling groove, so that the rotating sleeve drives the hinge rod to swing, and the hinge rod drives the sliding block to slide in the sliding cavity, so that the sliding pin can slide in the first sliding groove, the inclined groove and the second sliding groove. The structure is simple, and the movement stroke of the sliding block can be adjusted automatically according to the weight of the object.

[0025] Furthermore, an LCD display screen is provided on the top of the loading platform.

[0026] Through the above technical solution, the weighing data is displayed on the LCD display screen.

[0027] Furthermore, a protective cover having a contour matching the outer contour of the base is fixedly connected to the bottom surface of the stage, and the protective cover is engaged in the base and can slide freely up and down.

[0028] Through the above technical solution, the protective cover protects various components between the stage and the base to reduce the entry of dust or foreign matter.

[0029] The beneficial effects of the present invention are as follows:

[0030] (1) The present invention places an object on the loading platform. After the loading platform is pressed, it moves toward the base, so that the clamping component first cooperates with the high-precision weighing component to weigh, thereby realizing small-scale high-precision object weighing. When the weight of the object is large, the loading platform moves downward for a large stroke, so that the conversion component drives the clamping component to move, so that the clamping component cancels the cooperation with the high-precision weighing component and instead cooperates with the low-precision weighing component to realize large-scale low-precision object weighing. In summary, the technical solution realizes automatic adjustment of the weighing accuracy according to the weight of the object;

[0031] (2) The present invention uses the horizontal movement of the sliding block to make the sliding pin slide in the second sliding groove and not slide into the inclined groove, so that the floating column is in a stationary state relative to the clamping column, and then the clamping block contacts the stress deformation plate corresponding to the high-precision strain gauge, so that small-scale high-precision items can be weighed. When weighing large-scale low-precision items, the sliding block continues to move, and the sliding pin slides from the second sliding groove to the inclined groove, and then continues to slide into the first sliding groove. At this time, the floating column moves upward relative to the clamping column, and then drives the clamping block to move upward, and the amplitude of the upward movement is greater than the amplitude of the downward movement of the stage, so that the clamping block is out of contact with the stress deformation plate corresponding to the high-precision strain gauge, and the bottom of the clamping column contacts the stress deformation plate corresponding to the low-precision strain gauge, so that large-scale low-precision items can be weighed;

[0032] (3) The present invention enables the rotating sleeve to move downward relative to the fixed sleeve, thereby causing the ball to roll in the spiral rolling groove, so that the rotating sleeve drives the hinge rod to swing, and the hinge rod drives the sliding block to slide in the sliding cavity, thereby allowing the sliding pin to slide in the first sliding groove, the inclined groove and the second sliding groove. The structure is simple, and the movement stroke of the sliding block can be adjusted automatically according to the weight of the object. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 It is a schematic diagram of the overall structure of an intelligent dual-stage weighing electronic scale in the present invention;

[0034] Figure 2 yes Figure 1 Schematic diagram of structural explosion decomposition;

[0035] Figure 3 yes Figure 1 Schematic diagram of the structure at an upward viewing angle;

[0036] Figure 4 yes Figure 3 Schematic diagram of structural explosion decomposition;

[0037] Figure 5 yes Figure 4 A magnified schematic diagram of the local structure at point A;

[0038] Figure 6 yes Figure 1 The schematic diagram of the structure after the stage and the base are omitted;

[0039] Figure 7 yes Figure 6 Schematic diagram of the structure at an upward viewing angle;

[0040] Figure 8 yes Figure 7 A magnified schematic diagram of the local structure at B in the middle;

[0041] Fig. 9 yes Figure 6 The structural diagram after the fixed seat and telescopic column are omitted;

[0042] Fig.10 yes Fig. 9 Schematic diagram of the structure at an upward viewing angle;

[0043] Fig.11 It is a schematic diagram of the structure after the fixed sleeve, the rotating sleeve and the hinge rod are assembled in the present invention;

[0044] Fig.12 yes Fig.11 Schematic diagram of structural explosion decomposition;

[0045] Fig.13 It is a schematic diagram of the structure after the metering seat, the pressing column and the floating column are assembled in the present invention;

[0046] Fig.14 yes Fig.13 A schematic cross-sectional view of the structure;

[0047] Fig.15 It is a schematic cross-sectional view of the structure after the telescopic column, the fixing seat and the heavy-load spring are assembled in the present invention;

[0048] Fig.16 It is a schematic diagram of the electrical connection between the high-precision strain gauge, the low-precision strain gauge and the PCB circuit board in an embodiment of the present invention.

[0049] 1. The cam is provided with a plurality of connecting rods, a plurality of connecting rods and a plurality of connecting rods, and a plurality of connecting rods are provided with a plurality of connecting rods. The plurality of connecting rods have the plurality of connecting rods and a plurality of connecting rods. DETAILED DESCRIPTION

[0050] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0051] like Figure 1-Figure 16 As shown, the present embodiment provides an intelligent dual-stage weighing electronic scale, including a loading platform 1, the top surface of the loading platform 1 can be installed with an acrylic plate or tempered glass, and an LCD display screen 2 is arranged on the top surface of the loading platform 1, four telescopic columns 8 are fixedly connected to the bottom of the loading platform 1, and the four telescopic columns 8 are evenly distributed along the center line of the loading platform 1, and a fixing seat 9 is sleeved at the lower end of the telescopic column 8, and the telescopic column 8 can slide freely in the fixing seat 9, and the lower ends of the four fixing seats 9 are commonly connected to a base 3, and the top of the base 3 is open, and in addition, a protective cover 5 is fixedly connected to the bottom of the loading platform 1, and the outer contour of the protective cover 5 matches the outer contour of the base 3, and the protective cover 5 is engaged in the base 3 and can slide freely up and down, and in addition, four rubber pads 4 are arranged at the bottom of the base 3;

[0052] Combination Figure 6 , Figure 7 and Fig.15The cam 35 is actuated to move the locking cam 36 in a direction that the spring 36 is in contact with the locking cam 36 when the locking cam 36 is in contact with the locking cam 36.

[0053] Combination Figures 4 to 14 As shown, the inner bottom wall of the base 3 is evenly connected with four metering seats 10 with the center line of the base 3 as the axis. The inside of the metering seat 10 is hollow, and the outer wall of the metering seat 10 is integrally fixedly connected with a protrusion extending outward thereof. The inside of the protrusion is hollow and connected with the inner cavity of the metering seat 10. The inner bottom wall of the metering seat 10 and the inner bottom wall of the protrusion are respectively fixed with a bearing block 27, and the upper end surface of the bearing block 27 is fixed with a stress deformation plate 28. The top surfaces of the two stress deformation plates 28 are respectively embedded with a high-precision strain gauge 31 and a low-precision strain gauge 26. The high-precision strain gauge 31 and the low-precision strain gauge 26 are respectively arranged in the inner cavity of the protrusion and the inner cavity of the metering seat 10, as shown in FIG. Fig.16 As shown, the high-precision strain gauge 31 and the low-precision strain gauge 26 are electrically connected to the PCB circuit board 32 in parallel through cables. The PCB circuit board 32 is embedded in the stage 1. In addition, the PCB circuit board 32 is electrically connected to the power supply 30 (the power supply 30 can be a built-in battery or an external mains power) through cables. The LCD display screen 2 is also electrically connected to the PCB circuit board 32 through cables. When the stress deformation plate 28 is subjected to force, it will be deformed, thereby causing the high-precision strain gauge 31 and the low-precision strain gauge 26 to be deformed, so that the resistance values ​​of the high-precision strain gauge 31 and the low-precision strain gauge 26 will change. The PCB circuit board 32 processes and analyzes the resistance value, converts it into a weight data signal, and displays it through the LCD display screen 2;

[0054] Combination Figures 4 to 14As shown, a clamping column 16 is coaxially penetrated on the metering seat 10, and the upper end of the clamping column 16 is fixedly connected to the ground of the stage 1, and the clamping column 16 slides freely in the metering seat 10. The inside of the clamping column 16 is hollow and the bottom is closed. The inner hole of the clamping column 16 is telescopically inserted with a floating column 20, and the floating column 20 can freely move up and down in the inner hole of the clamping column 16. A connecting block 25 is fixedly connected to the periphery of the lower end of the floating column 20, and a through groove is provided on the periphery of the clamping column 16 for the connecting block 25 to freely move up and down. A clamping block 29 is fixedly connected to one end of the connecting block 25 passing through the clamping column 16, and the clamping block 29 extends to the inner cavity of the protruding part, and is in contact and connected with the top surface of the stress deformation plate 28 corresponding to the high-precision strain gauge 31;

[0055] Combination Figure 8 , Fig.13 and Fig.14 As shown, a sliding block 7 in a sliding cavity 14 is horizontally provided inside the loading platform 1, and the sliding block 7 slides freely horizontally in the sliding cavity 14. A free groove 13 penetrating the sliding cavity 14 is provided at the bottom of the loading platform 1, and a driving pin 21 is pierced at the upper end of the floating column 20. A strip groove for the upper end of the floating column 20 to pass freely is provided at the bottom of the sliding block 7, and a special-shaped groove penetrating the strip groove is provided on the side wall of the sliding block 7. The special-shaped grooves include a first sliding groove 24, an oblique groove 23, and a second sliding groove 22 connected end to end in a direction away from the center line of the loading platform 1. The first sliding groove 24 is located below the second sliding groove 22, and the driving pin 21 is inserted into the special-shaped groove and slides freely in the first sliding groove 24, the oblique groove 23, and the second sliding groove 22. When an object is placed on the loading platform 1 When the object is weighed, the gravity of the object will drive the stage 1 to move downward. During the movement, the stage 1 moves relative to the base 3, thereby causing the clamping column 16 to move relative to the metering seat 10. When the sliding block 7 moves horizontally, the driving pin 21 first slides in the second sliding groove 22. If the object is heavy, the driving pin 21 will slide from the second sliding groove 22 to the inclined groove 23, and then slide from the inclined groove 23 to the first sliding groove 24, thereby causing the floating column 20 to move relative to the clamping column 16. The floating column 20 will drive the clamping block 29 to be away from the high-precision strain gauge 31, and at the same time, the bottom of the clamping column 16 will contact the stress deformation plate 28 corresponding to the low-precision strain gauge 26, thereby performing a large-scale low-precision weighing.

[0056] Combination Figures 4 to 12As shown, the inner bottom wall of the base 3 is vertically fixedly connected with a fixed sleeve 12, and the bottom of the stage 1 is vertically rotatably connected with a rotating sleeve 11. The fixed sleeve 12 is inserted into the rotating sleeve 11 and slides freely. The upper end of the fixed sleeve 12 is rotatably embedded with a ball 19. The inner wall of the rotating sleeve 11 is provided with a spiral rolling groove 18 for the ball 19 to engage. The ball 19 and the spiral rolling groove 18 are in a rolling spiral fit, similar to the fit between a ball screw and a screw nut. The ball 19 rotates freely in the spiral rolling groove 18, and the rotating sleeve 1 Four hinge rods 6 are hinged on the periphery of the platform 1, a rotating pin 17 is vertically fixed at one end of the sliding block 7, a waist-shaped hole 15 is provided on the bottom surface of the stage 1 for the rotating pin 17 to freely pass through horizontally, and one end of the hinge rod 6 away from the rotating sleeve 11 is correspondingly hinged at the end of the rotating pin 17. When the stage 1 moves relative to the base 3, the ball 19 rolls in the spiral rolling groove 18, thereby driving the rotating sleeve 11 to rotate. When the rotating sleeve 11 rotates, the hinge rod 6 drives the sliding block 7 to slide in the sliding cavity 14.

[0057] The working principle of this embodiment is as follows:

[0058] Weighing small-range high-precision items: Place the (small-weight) items on the stage 1, the stage 1 will move downward under pressure, and the light-load spring 36 will be compressed and accumulate elastic potential energy. At this time, the pressing column 16 slides in the metering seat 10, and the fixed sleeve 12 and the rotating sleeve 11 move relative to each other, so that the ball 19 rolls in the spiral rolling groove 18, and the rotating sleeve 11 rotates. When the rotating sleeve 11 rotates, the hinge rod 6 drives the sliding block 7 to slide in the sliding cavity 14 toward the inner side of the stage 1, and the driving pin 21 is in the second sliding groove 2 2, when weighing a small weight item, the driving pin 21 slides in the second sliding groove 22, and keeps the floating column 20 and the pressing column 16 in a relatively static state, so that the pressing block 29 contacts the top surface of the stress deformation plate 28 corresponding to the high-precision strain gauge 31, and the stress deformation plate 28 is deformed, so that the high-precision strain gauge 31 is also deformed, and the resistance value of the high-precision strain gauge 31 changes at this time. The PCB circuit board 32 analyzes the resistance value change, and then feeds back the data to the LCD display screen 2, and the LCD display screen 2 displays the corresponding weight data;

[0059] Weighing large-scale low-precision items: Different from the weighing process of small-scale high-precision items, the downward movement stroke of the loading platform 1 will increase, thereby increasing the amplitude of the horizontal movement of the sliding block 7, so that the driving pin 21 will slide from the second sliding groove 22 to the inclined groove 23, and then slide from the inclined groove 23 to the first sliding groove 24 (it should be noted that the inclined groove 23 has a large inclination angle, so that the weight change of the item corresponding to the driving pin 21 sliding from the second sliding groove 22 to the first sliding groove 24 is small), the floating column 20 will move up relative to the clamping column 16, and drive the connecting block 25 and the clamping column 16 to move upward. The clamping block 29 moves upward, and the amplitude of the movement is greater than the downward stroke of the stage 1 at this time. In this way, as the stage 1 moves downward, the clamping block 29 will be out of contact with the surface of the stress deformation plate 28 corresponding to the high-precision strain gauge 31, and the bottom of the clamping column 16 will start to contact the top surface of the stress deformation plate 28 corresponding to the low-precision strain gauge 26, so that the low-precision strain gauge 26 can be weighed. In addition, at this time, the deformation of the light-loaded spring 36 is the largest, and the heavy-loaded spring 33 is compressed and deformed and elastic potential energy is accumulated. At the same time, the LCD display screen 2 displays the weight of the object;

[0060] Weighing is completed: the item is taken out from the loading platform 1. At this time, the elastic potential energy stored in the light-loaded spring 36 and the heavy-loaded spring 33 is released, thereby driving the loading platform 1 to move upward and reset. At the same time, all components return to their initial states. In addition, the elastic supporting force of the heavy-loaded spring 33 and the light-loaded spring 36 on the loading platform 1 is basically negligible relative to the weight of the item, especially the heavy-loaded spring 33 has basically no effect on the weighing result relative to the weight of the heavy item.

[0061] The above description is only a preferred embodiment of the present invention and is not intended to limit the protection scope of the present invention.

Claims

1. An intelligent two-stage weighing electronic scale, comprising a loading platform (1), characterized in that: Also includes: A base (3) connected to the loading platform (1), wherein a plurality of reset components are arranged between the base (3) and the bottom of the loading platform (1), and the reset components are used to make the loading platform (1) move relative to the base (3) after being subjected to pressure, and when the pressure disappears, the reset components drive the loading platform (1) to move in a direction away from the base (3); A plurality of metering seats (10) are evenly connected to the inner bottom wall of the base (3), the metering seats (10) are hollow inside and two weighing assemblies with different precisions are installed in sequence in the inner cavity from top to bottom, and a pressing assembly is provided on the metering seat (10); A conversion component is arranged on the loading platform (1), and is used to make the pressing component alternately cooperate with the two weighing components after the loading platform (1) moves downward to a fixed stroke.

2. The intelligent dual-stage weighing electronic scale according to claim 1, characterized in that: The reset assembly comprises a fixed seat (9) connected to the inner bottom wall of the base (3), a telescopic column (8) is coaxially passed through the fixed seat (9), the telescopic column (8) slides freely in the fixed seat (9), and a variable damping elastic member is installed in the fixed seat (9), and the variable damping elastic member is used to generate a resistance force that is first small and then large for the telescopic column (8) to move downward.

3. The intelligent dual-stage weighing electronic scale according to claim 2, characterized in that: The variable damping elastic member comprises a heavy-load spring (33) vertically mounted in the fixing seat (9); the upper end of the heavy-load spring (33) is fixedly connected to a mounting block (37); a mounting hole for the mounting block (37) to engage is provided at the downward end of the telescopic column (8); the mounting block (37) is freely slidable up and down in the mounting hole; a light-load spring (36) is fixedly connected to the upper end surface of the mounting block (37); the upper end of the light-load spring (36) elastically presses against the inner top wall of the mounting hole.

4. The intelligent dual-stage weighing electronic scale according to claim 3, characterized in that: A limit pin (34) is fixedly connected to the periphery of the lower end of the telescopic column (8), and a limit slot (35) is provided on the outer wall of the fixing seat (9) for the limit pin (34) to freely pass through for upward and downward movement.

5. The intelligent dual-stage weighing electronic scale according to claim 1, characterized in that: The weighing assembly comprises a protrusion fixedly connected to the outer wall of the metering seat (10); the interior of the protrusion is hollow and communicates with the inner cavity of the metering seat (10); the inner bottom wall of the metering seat (10) and the inner bottom wall of the protrusion are each fixedly connected with a bearing block (27); the upper end surface of the bearing block (27) is fixedly connected with a stress deformation plate (28); the top surfaces of the two stress deformation plates (28) are respectively embedded with a high-precision strain gauge (31) and a low-precision strain gauge (26); the high-precision strain gauge (31) and the low-precision strain gauge (26) are respectively arranged in the inner cavity of the protrusion and the inner cavity of the metering seat (10).

6. The intelligent dual-stage weighing electronic scale according to claim 5, characterized in that: The clamping assembly includes a clamping column (16) coaxially inserted on the metering seat (10), the clamping column (16) slides freely in the metering seat (10), the interior of the clamping column (16) is hollow and a floating column (20) is installed in a telescopic manner, the lower end of the floating column (20) is fixedly connected to a connecting block (25) at the periphery, the clamping column (16) is provided with a through groove for the connecting block (25) to move freely up and down, one end of the connecting block (25) passing through the clamping column (16) is fixedly connected to a clamping block (29), and the clamping block (29) extends to the inner cavity of the protruding portion.

7. The intelligent dual-stage weighing electronic scale according to claim 6, characterized in that: The conversion assembly comprises a sliding block (7) engaged in a sliding cavity (14) provided in the loading platform (1); the sliding block (7) slides freely horizontally in the sliding cavity (14); a clearance groove (13) penetrating the sliding cavity (14) is provided at the bottom of the loading platform (1); a driving pin (21) is passed through the upper end of the floating column (20); a strip groove is provided at the bottom of the sliding block (7) for the upper end of the floating column (20) to pass freely; a special-shaped groove penetrating the strip groove is provided on the side wall of the sliding block (7); the special-shaped groove The groove includes a first sliding groove (24), an inclined groove (23) and a second sliding groove (22) connected end to end in a direction away from the center line of the worktable (1), the first sliding groove (24) is located below the second sliding groove (22), the driving pin (21) is inserted into the special-shaped groove and slides freely in the first sliding groove (24), the inclined groove (23) and the second sliding groove (22), and a driving unit for driving the sliding block (7) to slide in the sliding cavity (14) is provided at the bottom of the worktable (1).

8. The intelligent dual-stage weighing electronic scale according to claim 7, characterized in that: The driving unit comprises a fixed sleeve (12) connected to the inner bottom wall of the base (3); the bottom of the loading platform (1) is vertically rotatably connected to a rotating sleeve (11); the fixed sleeve (12) is inserted into the rotating sleeve (11) and slides freely; a ball (19) is rotatably embedded in the periphery of the upper end of the fixed sleeve (12); a spiral rolling groove (18) for the ball (19) to engage is provided on the inner wall of the rotating sleeve (11); the ball (19) rotates freely in the spiral rolling groove (18); a plurality of hinge rods (6) are hinged on the periphery of the rotating sleeve (11); a rotating pin (17) is vertically fixed to one end of the sliding block (7); a waist-shaped hole (15) is provided on the bottom surface of the loading platform (1) for the rotating pin (17) to freely pass through for horizontal movement; and one end of the hinge rod (6) away from the rotating sleeve (11) is correspondingly hinged to the end of the rotating pin (17).

9. The intelligent dual-stage weighing electronic scale according to claim 1, characterized in that: An LCD display screen (2) is provided on the top of the object loading platform (1).

10. The intelligent dual-stage weighing electronic scale according to claim 1, characterized in that: A protective cover (5) having a contour matching the outer contour of the base (3) is fixedly connected to the bottom surface of the loading platform (1); the protective cover (5) is engaged in the base (3) and can slide freely up and down.

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