High-stability weighing sensor based on adaptive structure adjustment

Abstract

The invention discloses a high-stability weighing sensor based on self-adaptive structure adjustment, relates to the technical field of weighing sensors, and aims to solve the technical problem that the sensor bears unbalance loading force due to the fact that the placement position of an object is deviated, and the high-stability weighing sensor comprises a fixed base and a resistance strain type weighing sensor fixedly installed at the top of the fixed base. An adjusting mechanism is arranged at the top of the fixed base, and a stabilizing mechanism is arranged at the top of the adjusting mechanism. According to the invention, the floating seat is connected with the bearing seat through the spherical universal joint, and when a weighing object is placed at the edge of the bearing seat and causes unbalance loading, the spherical universal joint can actively adjust the posture of the bearing seat through inclination, and the L-shaped elastic arm at the unbalance loading side is matched to generate tiny bending due to increased stress; in the force transmission process, the first arc thin connection section can deform through self elasticity, interference of transverse component force on the main elastic body is eliminated, and the problem that the sensor bears unbalance loading force due to the fact that the placing position of an object is deviated is solved.

Description

Technical Field

[0001] This invention relates to the field of weighing sensor technology, and more specifically, to a highly stable weighing sensor based on adaptive structural adjustment. Background Technology

[0002] As a core component for weight measurement and force detection, load cells are widely used in numerous fields such as industrial production lines, warehousing and logistics, food processing, and chemical and pharmaceutical industries. Their measurement accuracy and long-term stability directly determine the controllability of production processes, the consistency of product quality, and the efficiency of logistics and warehousing. In practical applications, resistance strain gauge load cells have become the mainstream type of load cell due to their mature structure, high cost adaptability, and stable signal output.

[0003] In practical weighing processes, the force transmission path of traditional resistance strain gauge load cells is mostly a direct rigid connection between the load-bearing component and the main elastic body. Operators cannot guarantee that the item being weighed is accurately placed in the center of the sensor's load-bearing area every time. The item often shifts in position, causing the sensor to experience off-center loads. Since the load-bearing structure of traditional sensors is mostly a rigid, fixed design, it cannot adaptively adjust its posture according to changes in the item's position. The off-center load is directly transmitted to the sensor's main elastic body, resulting in uneven stress on the main elastic body. This deviation causes a lateral component or additional torque when the weight of the item is transmitted to the main elastic body, rather than a purely vertical force. The main elastic body therefore undergoes unexpected bending deformation, causing interference components in the strain gauge output signal, further reducing weighing accuracy. Therefore, we propose a highly stable load cell based on adaptive structural adjustment. Summary of the Invention

[0004] The purpose of this invention is to overcome the shortcomings of the prior art, adapt to practical needs, and provide a highly stable weighing sensor based on adaptive structural adjustment to solve the technical problem that the sensor often bears off-center load due to the misalignment of the placed items.

[0005] To solve the above-mentioned technical problems, the present invention provides the following technical solution: a highly stable weighing sensor based on adaptive structural adjustment, comprising a fixed base and a resistance strain gauge load cell fixedly installed on the top of the fixed base. An adjustment mechanism is provided on the top of the fixed base, and a stabilizing mechanism is provided on the top of the adjustment mechanism. The stabilizing mechanism includes a first arc-shaped thin section, an L-shaped elastic arm, and a floating seat. The floating seat is fixedly installed on the top of the resistance strain gauge load cell. The bottom of the floating seat is fixedly installed to the vertical end of the L-shaped elastic arm, and the first arc-shaped thin section is fixedly installed to the horizontal end of the L-shaped elastic arm. The adjustment mechanism includes a fixed rod, a threaded sleeve, a sliding block, and a spring. The fixed rod is fixedly installed on the top of the fixed base. The sliding block and the threaded sleeve are both slidably installed inside the fixed rod. The spring is disposed between the threaded sleeve and the sliding block. The adjustment mechanism is connected to the stabilizing mechanism and forms a surrounding auxiliary support for the stabilizing mechanism.

[0006] Preferably, the stabilizing mechanism further includes a fixing ring, which is fixedly installed on the outside of the resistance strain gauge load cell. A fixing plate is fixedly installed on the top of the fixing ring. The end of the first arc-shaped thin section away from the horizontal end is fixedly installed with the fixing plate. A damping plate is fixedly installed at the bottom of the vertical end. A bearing seat is fixedly installed on the top of the floating seat through a spherical universal joint.

[0007] Preferably, the adjusting mechanism further includes a gear ring, which is rotatably mounted inside the fixed base. A knob is fixedly mounted on the top of the gear ring. A gear that meshes with the gear ring is rotatably mounted on the inner side of the bottom of the fixed base. A threaded rod is fixedly mounted on the top of the gear. A threaded sleeve is threadedly mounted on the outer side of the threaded rod. A sliding block is fixedly mounted on the inner side of the fixed base fixedly mounted on the outer side of the fixed ring.

[0008] Preferably, a second arc-shaped thin joint segment with an arc-shaped diameter opposite to the first arc-shaped thin joint segment is fixedly installed on the inner side of the first arc-shaped thin joint segment. At least four sets of the first arc-shaped thin joint segment, the second arc-shaped thin joint segment, the L-shaped elastic arm and the spherical universal joint are provided and are circumferentially distributed at the center of the fixed base. The positions of the spherical universal joint and the L-shaped elastic arm are vertically corresponding.

[0009] Preferably, the inner diameter of the fixing ring and the fixing plate is adapted to the outer diameter of the resistance strain gauge load cell.

[0010] Preferably, the fixed rod is provided with a slide rail that is compatible with the sliding block and the threaded sleeve.

[0011] Preferably, a mounting block is fixedly installed on the periphery of the fixed base, and the mounting block has mounting holes.

[0012] Compared with the prior art, the beneficial effects of the present invention are:

[0013] 1. This invention connects the floating seat and the bearing seat via a spherical universal joint. When the weighed item is placed on the edge of the bearing seat, causing an off-center load, the spherical universal joint can actively adjust the posture of the bearing seat by tilting. In conjunction with the L-shaped elastic arm on the off-center side, which bends slightly due to increased force, and the L-shaped elastic arm on the non-off-center side rebounds slightly due to decreased force, the resultant force vector of multiple L-shaped elastic arms always points to the center of the resistance strain gauge load cell. This realizes the conversion of off-center load force into a uniformly distributed force. During the force transmission process, the first arc thin section can compensate for the installation error or angular deviation between the L-shaped elastic arm and the resistance strain gauge load cell through its own elastic deformation. This ensures that the weight is transmitted to the resistance strain gauge load cell in the form of a vertical force, eliminating the interference of the lateral component force on the main elastic body and solving the problem that the sensor often bears an off-center load due to the off-center placement of the item.

[0014] 2. The present invention also uses a second arc-shaped thin section fixed to the inner side of the first arc-shaped thin section and opposite to its arc surface. The double arcs working in opposite directions can disperse the concentrated stress at the arc apex of the first arc-shaped thin section to the double arc area, avoiding the risk of cracking caused by stress concentration in the single arc structure. This significantly improves the fatigue resistance of the first arc-shaped thin section, extends the service life of the stabilizing mechanism and even the entire sensor, and reduces the frequency and cost of later maintenance and replacement. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the external structure of the present invention;

[0016] Figure 2 This is a schematic diagram of the stabilizing mechanism structure of the present invention;

[0017] Figure 3 For the present invention Figure 2 Enlarged schematic diagram of the structure at point A in the middle;

[0018] Figure 4 This is a schematic diagram of the adjustment mechanism structure of the present invention;

[0019] Figure 5 This is a schematic cross-sectional view of the adjustment mechanism of the present invention;

[0020] Figure 6 This is a schematic diagram of the threaded rod and related structures of the present invention;

[0021] Figure 7 This is a schematic diagram of the bottom structure of the adjustment mechanism of the present invention.

[0022] The following are the labels in the diagram: 1. Fixed base; 11. Mounting block; 111. Mounting hole; 2. Stabilizing mechanism; 21. Fixing ring; 211. Fixed seat; 22. Fixing plate; 23. First arc thin section; 231. Second arc thin section; 24. L-shaped elastic arm; 241. Vertical end; 242. Horizontal end; 25. Damping plate; 26. Floating seat; 27. Spherical universal joint; 28. Bearing seat; 3. Adjusting mechanism; 31. Fixed rod; 32. Sliding block; 33. Spring; 34. Threaded sleeve; 341. Threaded rod; 35. Gear; 36. Gear ring; 37. Knob; 4. Resistance strain gauge load cell. Detailed Implementation

[0023] Example: Figures 1 to 7As shown, the present invention relates to a highly stable load cell based on adaptive structural adjustment, comprising a fixed base 1 and a resistance strain gauge load cell 4 fixedly mounted on the top of the fixed base 1. An adjustment mechanism 3 is provided on the top of the fixed base 1, and a stabilizing mechanism 2 is provided on the top of the adjustment mechanism 3. Mounting blocks 11 are fixedly mounted on the periphery of the fixed base 1, and the mounting blocks 11 have mounting holes 111. The stabilizing mechanism 2 includes a first arc-shaped thin section 23, an L-shaped elastic arm 24, and a floating seat 26. The floating seat 26 is fixedly mounted on the top of the resistance strain gauge load cell 4, and the bottom of the floating seat 26 is perpendicular to the vertical end of the L-shaped elastic arm 24. 241 is fixedly installed. The first arc-shaped thin joint segment 23 and the horizontal end 242 of the L-shaped elastic arm 24 are fixedly installed. A second arc-shaped thin joint segment 231 with the same arc is fixedly installed on the inner side of the first arc-shaped thin joint segment 23. At least four sets of the first arc-shaped thin joint segment 23, the second arc-shaped thin joint segment 231, the L-shaped elastic arm 24 and the ball joint 27 are provided and are circumferentially distributed around the center of the fixed base 1. The positions of the ball joint 27 and the L-shaped elastic arm 24 are vertically corresponding. The adjustment mechanism 3 includes a fixed rod 31, a threaded sleeve 34, a sliding block 32 and a spring 33. The fixed rod 31 is fixedly installed on the top of the fixed base 1. The sliding block 32 and the threaded sleeve 34 are both slidably installed inside the fixed rod 31. The fixed rod 31 is provided with a slide rail adapted to the sliding block 32 and the threaded sleeve 34. The spring 33 is disposed between the threaded sleeve 34 and the sliding block 32. The adjusting mechanism 3 is connected to the stabilizing mechanism 2 and forms a surrounding auxiliary support for the stabilizing mechanism 2. In this invention, the floating seat 26 is connected to the bearing seat 28 through a ball joint 27. When the weighed item is placed on the edge of the bearing seat 28 and causes an off-center load, the ball joint 27 can actively adjust the posture of the bearing seat 28 by tilting. In conjunction with the L-shaped elastic arm 24 on the off-center side, the increased force will produce... The L-shaped elastic arm 24 on the unloaded side undergoes a slight bend and rebounds slightly due to the reduced force. The resultant force vector of multiple L-shaped elastic arms 24 always points towards the center of the resistance strain gauge load cell 4, realizing the conversion of the off-center load force into a uniformly distributed force. During the force transmission process, the first arc-shaped thin section 23 can compensate for the installation error or angular deviation between the L-shaped elastic arm 24 and the resistance strain gauge load cell 4 through its own elastic deformation, ensuring that the weight is transmitted to the resistance strain gauge load cell 4 in the form of a vertical force. This eliminates the interference of the lateral component force on the main elastic body and solves the problem that the sensor often bears an off-center load force due to the offset of the placement position of the item.

[0024] Furthermore, such as Figures 2 to 3As shown, the stabilizing mechanism 2 also includes a fixing ring 21, which is fixedly installed on the outside of the resistance strain gauge load cell 4. A fixing plate 22 is fixedly installed on the top of the fixing ring 21. The inner diameter of the fixing ring 21 and the fixing plate 22 is adapted to the outer diameter of the resistance strain gauge load cell 4. The end of the first arc-shaped thin section 23 away from the horizontal end 242 is fixedly installed with the fixing plate 22. A damping plate 25 is fixedly installed at the bottom of the vertical end 241. A bearing seat 28 is fixedly installed on the top of the floating seat 26 through a spherical universal joint 27, ensuring that the contact point between the bearing seat 28 and the floating seat 26 always maintains a balanced stress state. This avoids the problem of single-point stress concentration caused by eccentric loading in traditional rigid bearing structures from the source, ensuring the initial accuracy of the weighing data and reducing fatigue damage to the bearing components.

[0025] Furthermore, such as Figures 4 to 7 As shown, the adjustment mechanism 3 also includes a gear ring 36, which is rotatably mounted inside the fixed base 1. A knob 37 is fixedly mounted on the top of the gear ring 36. A gear 35 that meshes with the gear ring 36 is rotatably mounted on the inner side of the bottom of the fixed base 1. A threaded rod 341 is fixedly mounted on the top of the gear 35. A threaded sleeve 34 is threadedly mounted on the outer side of the threaded rod 341. A sliding block 32 is fixedly mounted on the inner side of the fixed seat 211 fixedly mounted on the outer side of the fixed ring 21. The threaded fit design between the threaded sleeve 34 and the threaded rod 341 allows the gear ring 36 and the gear 35 to be driven by the knob 37, thereby achieving precise adjustment of the compression of the spring 33. This solves the problem of spring force attenuation caused by long-term use of traditional springs 33, ensuring that the spring 33 is always in the optimal support stiffness state.

[0026] Working Principle: This embodiment provides a highly stable load cell based on adaptive structural adjustment. During use, when the pressure on the resistance strain gauge load cell 4 deviates from its center (i.e., the object to be weighed is placed on the edge of the support base 28), the spherical universal joint 27 can first adaptively adjust the posture of the support base 28 by tilting. When the support base 28 attempts to shift towards the heavy object, the spherical universal joint 27, positioned opposite to it, generates a counterforce, thus balancing this shifting trend. This ensures that the contact points between the support base 28 and the floating seat 26 always maintain balanced force at four points, avoiding stress concentration at a single point. When the floating seat 26 tilts, the L-shaped elastic arm 24 on the off-center side experiences a slight bend due to increased force. The L-shaped elastic arm 24 on the unloaded side rebounds slightly due to the reduced force, but the resultant force vector of multiple elastic arms always points to the center of the main elastic body. The floating seat 26 transfers the weight to the L-shaped elastic arm 24. The L-shaped elastic arm 24, through the bending deformation of the L-shaped structure, simultaneously squeezes the first arc thin section 23, offsetting the installation error or angular deviation between the L-shaped elastic arm 24 and the resistance strain gauge load cell 4, ensuring that the force is transmitted vertically to the resistance strain gauge load cell 4. Furthermore, a second arc thin section 231 is provided inside the first arc thin section 23, while the second arc thin section 231 is arranged in the opposite direction inside the first arc thin section 23. The arc surfaces of the two are opposite to each other, reducing the stress at the arc apex of the first arc thin section 23.

[0027] At the same time, when the heavy object is placed on the edge of the support seat 28, it will also cause the resistance strain gauge load cell 4 to tilt with respect to the fixed base 1. At this time, the fixed ring 21 drives the sliding block 32 to slide inside the fixed rod 31 through the fixed seat 211, thereby squeezing the spring 33. Through the reaction force of the spring 33, and the tension of the spring 33 in the opposite position, part of the squeezing force is offset, which can provide auxiliary support and buffer for the resistance strain gauge load cell 4 and prevent the resistance strain gauge load cell 4 from tipping over.

[0028] By rotating the knob 37, the knob 37 drives the gear ring 36 to rotate, and the gear ring 36 drives the gear 35 that meshes with it to rotate, causing the threaded rod 341 to rotate, which in turn drives the threaded sleeve 34 to slide inside the fixed rod 31, thereby adjusting the elastic force of the spring 33 located between the sliding block 32 and the fixed rod 31, thus ensuring that the spring 33 is always in the optimal support stiffness state.

[0029] The embodiments disclosed in this invention are preferred embodiments, but are not limited thereto. Those skilled in the art can easily understand the spirit of this invention based on the above embodiments and make different extensions and variations, but as long as they do not depart from the spirit of this invention, they are all within the protection scope of this invention.

Claims

1. A highly stable weighing sensor based on adaptive structural adjustment, comprising a fixed base (1) and a resistance strain gauge load cell (4) fixedly mounted on the top of the fixed base (1), characterized in that, The fixed base (1) is provided with an adjustment mechanism (3) on top, and the adjustment mechanism (3) is provided with a stabilizing mechanism (2) on top. The stabilizing mechanism (2) includes a first arc-shaped thin section (23), an L-shaped elastic arm (24), and a floating seat (26). The floating seat (26) is fixedly installed on the top of the resistance strain gauge load cell (4). The bottom of the floating seat (26) is fixedly installed with the vertical end (241) of the L-shaped elastic arm (24), and the first arc-shaped thin section (23) is fixedly installed with the horizontal end (242) of the L-shaped elastic arm (24). The adjustment mechanism (3) includes a fixed rod (31), a threaded sleeve (34), a sliding block (32), and a spring (33). The fixed rod (31) is fixedly installed on the top of the fixed base (1). The sliding block (32) and the threaded sleeve (34) are both slidably installed inside the fixed rod (31). The spring (33) is disposed between the threaded sleeve (34) and the sliding block (32). The adjustment mechanism (3) is connected to the stabilizing mechanism (2) and forms a surrounding auxiliary support for the stabilizing mechanism (2).

2. The highly stable weighing sensor based on adaptive structural adjustment according to claim 1, characterized in that, The stabilizing mechanism (2) also includes a fixing ring (21), which is fixedly installed on the outside of the resistance strain gauge load cell (4). A fixing plate (22) is fixedly installed on the top of the fixing ring (21), and the end of the first arc thin section (23) away from the horizontal end (242) is fixedly installed with the fixing plate (22). A damping plate (25) is fixedly installed at the bottom of the vertical end (241); The top of the floating seat (26) is fixedly mounted with a bearing seat (28) via a ball joint (27).

3. A highly stable weighing sensor based on adaptive structural adjustment according to claim 2, characterized in that, The adjustment mechanism (3) also includes a gear ring (36), which is rotatably installed inside the fixed base (1). A knob (37) is fixedly installed on the top of the gear ring (36). A gear (35) that meshes with the gear ring (36) is rotatably installed on the inner side of the bottom of the fixed base (1). A threaded rod (341) is fixedly installed on the top of the gear (35). The threaded sleeve (34) is threaded onto the outside of the threaded rod (341); The sliding block (32) is fixedly installed on the inner side of the fixed seat (211) fixedly installed on the outside of the fixed ring (21).

4. A highly stable weighing sensor based on adaptive structural adjustment according to claim 2, characterized in that, The inner side of the first arc thin joint (23) is fixedly installed with a second arc thin joint (231) that is opposite to its arc. At least four sets of the first arc thin joint (23), the second arc thin joint (231), the L-shaped elastic arm (24) and the ball universal joint (27) are provided, and are circumferentially distributed at the center of the fixed base (1). The positions of the ball universal joint (27) and the L-shaped elastic arm (24) are vertically corresponding.

5. A highly stable weighing sensor based on adaptive structural adjustment according to claim 2, characterized in that, The inner diameters of the fixing ring (21) and the fixing plate (22) are adapted to the outer diameter of the resistance strain gauge load cell (4).

6. A highly stable weighing sensor based on adaptive structural adjustment according to claim 3, characterized in that, The fixed rod (31) is provided with a slide rail that is compatible with the sliding block (32) and the threaded sleeve (34).

7. A highly stable weighing sensor based on adaptive structural adjustment according to claim 1, characterized in that, The mounting block (11) is fixedly installed on the periphery of the fixed base (1), and the mounting block (11) has mounting holes (111).

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