A weighing sensor with varying sensitivity

Abstract

This application relates to the field of weighing sensors, and more particularly to a weighing sensor with variable sensitivity. The weighing sensor includes a frame, a curved clamp, a curved cantilever beam, a fixed magnet, a cantilever beam magnet, and a force display device. The curved clamp is mounted on the frame, one end of the curved cantilever beam is disposed within the curved clamp, and the other end of the curved cantilever beam is provided with a cantilever beam magnet. The fixed magnet is mounted on the frame and positioned above the cantilever beam magnet. The cantilever beam magnet is attracted by the fixed magnet, causing the curved cantilever beam to bend upwards. The force display device is mounted on the frame. The upward bending of the curved cantilever beam under the magnetic force of the two sets of magnets changes the effective length of the beam. When used for weighing, the curved cantilever beam moves downwards under a loaded load, changing its effective beam length, and simultaneously the magnetic force changes. This nonlinear stiffness structure achieves the function of variable sensitivity.

Description

Technical Field

[0001] This application relates to the field of weighing sensors, and more particularly to a weighing sensor with varying sensitivity. Background Technology

[0002] With the increasing variety of sensors and their ever-expanding application scope, sensor technology has become one of the indispensable foundational technologies of today's information society. Generally speaking, among the various types of sensors, force sensors have developed very rapidly, and their applications have gradually permeated all aspects of social production and life, including light industry, aerospace, and medicine. Against this backdrop, force sensors are also showing a trend towards intelligence, integration, and precision. Among them, strain gauge force sensors have already been widely used in many measurement and control fields, especially in weight measurement, where the technology is already very mature.

[0003] Current load cells have a constant stiffness in their elastic sensing element, which results in a drawback where the sensitivity cannot change with variations in the force being measured. Summary of the Invention

[0004] The main objective of this application is to provide a load cell with variable sensitivity, which aims to solve the problem that current sensors have a constant stiffness of elastic sensing element, resulting in a lack of sensitivity that cannot change with the measured force.

[0005] To achieve the above objectives, this application provides a load cell with varying sensitivity, the load cell comprising a frame, a curved clamp, a curved cantilever beam, a fixed magnet, a cantilever beam magnet, and a force display device.

[0006] The curved fixture is mounted on the frame, one end of the curved cantilever beam is mounted in the curved fixture, and the other end of the curved cantilever beam is mounted with a cantilever beam magnet.

[0007] The fixed magnet is mounted on the frame and positioned above the cantilever beam magnet; the cantilever beam magnet is attracted by the fixed magnet, causing the curved cantilever beam to bend upwards;

[0008] The force display device is mounted on the frame.

[0009] Optionally, the curved fixture includes an upper fixture and a lower fixture; one end of the curved cantilever beam is disposed between the upper fixture and the lower fixture, the lower surface of the upper fixture is curved, and the curved surface fits against the curved cantilever beam.

[0010] Optionally, the load cell further includes a clamp support frame, which includes at least one bolt or screw, and the curved clamp is mounted on the frame by the bolt or screw. The at least two sets of bolts and screws are respectively positioned above and below the curved clamp.

[0011] Optionally, the weighing sensor further includes a magnet holder, which is disposed on the frame and located above the cantilever beam magnet, and the fixed magnet is disposed on the magnet holder.

[0012] Optionally, the force display device is a force scale, which is located on one side of the cantilever beam magnet.

[0013] Optionally, the initial position of the cantilever beam magnet corresponds to the ON scale line of the force being measured; when the curved cantilever beam is in a horizontal state, the position of the cantilever beam magnet corresponds to the maximum range scale line of the force measuring scale.

[0014] Optionally, the weighing sensor further includes a displacement sensor disposed below the cantilever beam magnet, the displacement sensor being used to acquire position data of the cantilever beam magnet;

[0015] The force display device includes a processor and a force display; the processor is used to convert the position data of the cantilever beam magnet into force data and send the force data to the force display, which is used to display the force data.

[0016] Optionally, when the curved cantilever beam is in a horizontal state, the cantilever beam magnet is located directly below the fixed magnet.

[0017] Optionally, the curved clamp is made of acrylic material.

[0018] Optionally, the curved cantilever beam is made of metal.

[0019] Compared to existing technologies, the beneficial effects achieved by this application are as follows:

[0020] This application provides a load cell with variable sensitivity. In its structure, a curved cantilever beam is fixed to a curved clamp. Two sets of magnets are fixed at a certain distance to the frame and the tip of the curved cantilever beam, respectively. Under the action of magnetic force, the curved cantilever beam bends upward, thereby changing the effective length of the beam. When used for weighing, with a loaded load, the curved cantilever beam moves downward, its effective beam length changes, and the magnetic force also changes. This nonlinear stiffness structure achieves variable sensitivity. The effective length of the curved cantilever beam gradually increases from its initial position as the measured force increases, i.e., the sensitivity gradually increases. This achieves high sensitivity when measuring large loads and low sensitivity when measuring small loads, overcoming the shortcomings of existing metal cantilever beams with constant stiffness, which cannot change sensitivity with changes in the measured force.

[0021] This invention features a compact structure, convenient processing and installation, reliable performance, and the overall size of the weighing sensor can be designed according to actual measurement needs, making it suitable for a wide range of applications. Attached Figure Description

[0022] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0023] Figure 1 This is a schematic diagram of the structure of the weighing sensor with sensitivity variation in the embodiments of this application;

[0024] Figure 2 This illustrates the relationship between the measured external force and the magnet spacing in the embodiments of this application.

[0025] Figure 3 This is a comparison of the sensitivity of the weighing sensor with sensitivity variation in the embodiments of this application with that of a normal weighing sensor;

[0026] Figure 4 This illustrates the relationship between the distance between the two magnets of the weighing sensor and the change in sensor stiffness in the embodiments of this application.

[0027] Symbol explanation: 1-Cantilever beam magnet, 2-Magnet fixing frame, 3-Fixed magnet, 4-Measured force scale, 5-Laser displacement sensor, 6-Frame, 7-Clamp support frame, 8-Curved clamp, 801-Upper clamp, 802-Lower clamp, 9-Curved cantilever beam.

[0028] The realization of the purpose, functional features and advantages of this application will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0029] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0030] It should be noted that all directional indications (such as up, down, left, right, front, back, etc.) in the embodiments of the present invention are only used to explain the relative positional relationship and movement of each component in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indication will also change accordingly.

[0031] In this invention, unless otherwise explicitly specified and limited, the terms "connection," "fixed," etc., should be interpreted broadly. For example, "fixed" can mean a fixed connection, a detachable connection, or an integral part; it can mean a mechanical connection or an electrical connection; it can mean a direct connection or an indirect connection through an intermediate medium; it can mean the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0032] Furthermore, if the embodiments of this invention involve descriptions such as "first" or "second," these descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the meaning of "and / or" throughout the text includes three parallel solutions; for example, "A and / or B" includes solution A, solution B, or a solution where both A and B are satisfied simultaneously. Furthermore, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed by this invention.

[0033] With the increasing variety of sensors and their ever-expanding application scope, sensor technology has become one of the indispensable foundational technologies of today's information society. Generally speaking, among the various types of sensors, force sensors have developed very rapidly, and their applications have gradually permeated all aspects of social production and life, including light industry, aerospace, and medicine. Against this backdrop, force sensors are also showing a trend towards intelligentization, integration, and precision.

[0034] Among force sensors, strain gauge force sensors have long been widely used in many measurement and control fields, especially in weight measurement, where the technology is very mature. Therefore, many scientists and engineers both domestically and internationally are striving for further breakthroughs. Existing strain gauge force sensors generally fall into the following categories: bridge type, shear beam type, single-point type, column type, spoke type, plate type, parallel beam type, and S-type. They are mainly used in weighing applications.

[0035] Traditional resistance strain gauge sensors consist of an elastic sensing element and a resistance strain gauge. When the elastic sensing element senses a measured force, it deforms, and strain occurs on its surface. The resistance strain gauge, attached to the surface of the elastic sensing element, will also experience strain, thus changing its resistance value. By measuring the change in the resistance value of the resistance strain gauge, the magnitude of the measured force can be determined.

[0036] The elastic sensing element serves as the sensitive component in a sensor. As the core element of a resistance strain gauge sensor, its stiffness is typically constant. This means that as the applied load increases, the degree of deformation increases linearly with the load. This leads to the following relationship between the measured load and sensitivity: low-stiffness load cells have high sensitivity because the sensor deforms significantly under small loads. However, such low-stiffness sensors have a limited measurement range because larger forces can cause excessive strain, while high-stiffness load cells, although offering a large measurement range, have lower sensitivity. This relationship limits their application range.

[0037] Reference Figure 1 The first embodiment of this application provides a weighing sensor with varying sensitivity, the device comprising:

[0038] The weighing sensor includes a frame 6, a curved clamp 8, a curved cantilever beam 9, a fixed magnet 3, a cantilever beam magnet 1, and a force display device.

[0039] The curved clamp 8 is mounted on the frame 6, one end of the curved cantilever beam 9 is mounted in the curved clamp 8, and the other end of the curved cantilever beam 9 is mounted with a cantilever beam magnet 1.

[0040] The fixed magnet 3 is mounted on the frame 6 and positioned above the cantilever beam magnet 1; the cantilever beam magnet 1 is attracted by the fixed magnet 3, causing the curved cantilever beam 9 to bend upwards;

[0041] The force display device is mounted on the frame 6.

[0042] This application uses a curved clamp 8 and a magnet to bend the curved cantilever beam 9 upward under the action of magnetic force, thereby changing the effective length of the beam. Due to the change in the effective beam length and the magnetic force, this nonlinear stiffness structure realizes the function of variable sensitivity.

[0043] Specifically, in the initial state, the cantilever beam magnet 1 and the fixed magnet 3 at the tip of the curved cantilever beam 9 cause the cantilever beam to bend upwards due to magnetic force, resulting in the shortest effective length (projected length in the horizontal direction) of the cantilever beam. At this time, the magnetic force is very large, and the displacement of the tip of the curved cantilever beam 9 does not change much when the applied force increases, i.e., the sensitivity is low. However, as the applied force gradually increases, the distance between the two magnets gradually increases, and the magnitude of the magnetic force decreases with increasing distance. See [reference needed]. Figure 2 Meanwhile, as the curved cantilever beam 9 gradually returns to a horizontal position from its previous upward bend, its effective length gradually increases. Therefore, if a small force is added on top of the already large applied force, the displacement change at the tip of the curved cantilever beam 9 will be more pronounced, resulting in higher sensitivity. Compared to existing technologies, the weighing sensor of this application exhibits non-linear characteristics.

[0044] The stiffness of the load cell in this application gradually decreases from its initial position as the measured force increases. This allows the cantilever beam to exhibit low sensitivity under smaller forces and high sensitivity under larger forces, thus achieving the goal of high sensitivity when measuring large loads and low sensitivity when measuring small loads. See [link to relevant documentation]. Figure 3 This invention compares the variable sensitivity of the weighing sensor described in this application with the constant sensitivity of a conventional weighing sensor. This invention overcomes the drawback of metal cantilever beams, which have constant stiffness and cannot change their sensitivity with variations in the measured force.

[0045] To ensure that the curved cantilever beam 9 can achieve variable stiffness, its dimensions and material need to be determined based on specific requirements. The selection principle for the curved cantilever beam 9 is to meet both certain stiffness requirements and a certain degree of flexibility to achieve the upward bending of the cantilever beam in the initial state.

[0046] When the cantilever beam is held in place by the clamp and without magnetic force (final state), it should remain horizontal, with its tip vertically aligned with the position of the magnet on the magnet holder 2. There are no specific restrictions on the materials used for the fixing magnet 3 and the cantilever beam magnet 1. The cantilever beam magnet 1 can be fixed to the tip of the cantilever beam by adhesive or embedding. The fixing magnet 3 is positioned below the magnet holder 2, and the fixing methods include, but are not limited to, screw fastening, adhesive bonding, or embedding, as long as the connection is secure and does not damage the cantilever beam structure. To meet the requirement of sufficient magnetic force, the smaller the magnet size, the better.

[0047] As an optional implementation method, refer to Figure 1The second embodiment of this application provides a specific structure of a curved clamp 8, which includes an upper clamp 801 and a lower clamp 802. One end of the curved cantilever beam 9 is embedded between the upper clamp 801 and the lower clamp 802. The lower surface of the upper clamp 801 is curved, so that when the metal cantilever beam 9 is subjected to the force to be measured, the length of the movable part of the metal cantilever beam 9 can be formed due to the different degrees of contact with the curved surface of the upper clamp, so as to achieve the purpose of variable stiffness of the metal cantilever beam 9 and increase sensitivity with the increase of the force to be measured. The lower surface of the upper clamp 801 is in contact with the curved cantilever beam 9 to ensure that it is the same as the initial state of the measured force of the design when it is 0. If it is not in contact, it means that the structural characteristics of the design have changed and cannot meet the sensitivity requirements.

[0048] As an example, the curved cantilever beam 9 is clamped in the upper clamp 801 and the lower clamp 802. The curved cantilever beam 9 can be completely fixed to the curved clamp 8 by inserting screws or bolts to prevent the curved cantilever beam 9 from shifting.

[0049] When the force to be measured is applied to the tip of the curved cantilever beam 9, as the tip of the curved cantilever beam 9 moves downward, the portion of the curved cantilever beam 9 that is in contact with the curved surface of the upper clamp 801 gradually decreases until it is no longer in contact at all. At this point, the curved cantilever beam 9 is in a horizontal state. The tip of the curved cantilever beam 9 mentioned in this article refers to the end of the curved cantilever beam 9 that is not fixed in the curved clamp 8.

[0050] In the design process, the magnet and the curved cantilever beam 9 are first designed according to the range of forces to be measured, and then the curved clamp 8 is designed according to the bending condition of the curved cantilever beam 9 in the initial state. Specifically, the lower clamp 802 can be a planar clamp, the surface of which contacts the curved cantilever beam 9 is a plane, which can meet the clamping requirements. The upper clamp 801 and the lower clamp 802 have the same length and width, and their upper and lower surfaces are kept parallel.

[0051] By using the curved clamp 8, the curved cantilever beam 9 can be clamped without being restricted by the installation orientation, thus simplifying the mechanical structure.

[0052] As an optional implementation method, refer to Figure 1 The weighing sensor also includes a clamp support frame 7, which includes at least one bolt or screw, and the curved clamp 8 is mounted on the frame 6 by the bolt or screw.

[0053] Specifically, as an example, the clamp support frame 7 includes six bolts. Four bolts are grouped in pairs and inserted from both sides of the frame 6 into the side walls of the frame 6 and the lower clamp 802 to support the lower clamp 802. The other two bolts are inserted from both sides of the frame 6 into the side walls of the frame 6 and the upper clamp 801 to restrict the position of the upper clamp 801. The gap between the upper clamp 801 and the lower clamp 802 can be adjusted by adjusting the mounting holes of the bolts on the frame 6. All six bolts are made of metal.

[0054] As an optional implementation method, refer to Figure 1 The device further includes a magnet mounting bracket 2, which is mounted on the frame 6 and located above the cantilever beam magnet 1. A fixing magnet 3 is mounted on the magnet mounting bracket 2. The fixing magnet 3 is secured to the lower surface of the mounting bracket by screws.

[0055] The selection of the curved cantilever beam 9 must meet certain stiffness requirements and also have a certain flexibility to meet the upward bending of the curved cantilever beam 9 in the initial condition. Therefore, stainless steel is selected as the material in this embodiment. If the required stiffness can be met, the material of the curved cantilever beam 9 may include, but is not limited to, stainless steel.

[0056] As an optional implementation method, refer to Figure 1 The force display device is a force scale 4, which is set on one side of the cantilever beam magnet 1 and is divided into scales along the moving direction of the cantilever beam magnet 1. The specific setting position is convenient for viewing the scale.

[0057] As an optional implementation, based on the above embodiment, the initial position of the cantilever beam magnet 1 corresponds to the 0N scale line of the measured force scale 4; as the measured force gradually increases, the tip of the curved cantilever beam 9 gradually moves downward. When the curved cantilever beam 9 is in a horizontal state, that is, when the curved cantilever beam 9 is straight, the position of the cantilever beam magnet 1 corresponds to the maximum range scale line of the measured force scale 4. In this state, the weighing sensor reaches the maximum force within the measurement range. The magnitude of this maximum force is equal to the magnitude of the magnetic force generated between the fixed magnet 3 and the cantilever beam magnet 1 at this time.

[0058] The scale of the force-measuring scale 4 should be drawn before measurement. Specifically, as an optional implementation, to ensure the accuracy of the scale drawing, a laser displacement sensor 5 or a Hall sensor is used to measure the displacement distance of the cantilever beam magnet 1 under different forces. Based on the data obtained from the displacement sensor, the scale is drawn at the corresponding position on the force-measuring scale 4 and quantified into the magnitude of the corresponding force. After the force-measuring scale 4 is drawn, the displacement sensor is no longer needed, and subsequent measurements can be performed directly by reading the corresponding scale based on the position of the cantilever beam magnet 1. The sensor used for drawing the scale is not limited to the laser displacement sensor 5 or the Hall sensor, as long as it meets the requirements of small size and accurate measurement.

[0059] The laser displacement sensor 5 obtains the displacement information of an object by measuring the laser signal reflected from the surface of the object. In the scheme using the laser displacement sensor 5, the laser displacement sensor 5 is set below the cantilever beam magnet 1. The laser emitted by it illuminates the lower surface of the cantilever beam magnet 1 and is then emitted. The laser displacement sensor 5 receives the reflected laser and thus obtains the position information of the cantilever beam magnet 1.

[0060] A Hall effect sensor is a type of magnetic sensor that can detect magnetic fields and their changes, and can be used in various magnetic field-related applications. When two permanent magnets are placed opposite each other, with a linear Hall effect sensor positioned in the middle, this point can be used as the zero point of displacement. When the Hall effect sensor makes a displacement ΔZ along the Z-axis, the sensor outputs a voltage, the magnitude of which is proportional to the magnitude of the displacement. In this application, the Hall effect sensor needs to be placed between the cantilever beam magnet 1 and the fixed magnet 3. When the cantilever beam magnet 1 moves, the magnetic field changes, and the displacement of the cantilever beam magnet 1 can be measured.

[0061] As an optional implementation, the weighing sensor further includes a displacement sensor disposed below the cantilever beam magnet 1, the displacement sensor being used to acquire position data of the cantilever beam magnet 1;

[0062] The force display device includes a processor and a force display.

[0063] The displacement sensor is electrically connected to the processor, and the processor is electrically connected to the force display.

[0064] The processor has a pre-stored data processing program. The correspondence between the magnitude of the applied force and the displacement of the cantilever beam magnet 1 is obtained through prior experiments. Based on this correspondence, the data processing program is written so that the processor can directly determine the magnitude of the corresponding force based on the displacement data of the cantilever beam magnet 1 during subsequent weighing.

[0065] The processor is used to acquire position data measured by the displacement sensor, convert the position data of the cantilever beam magnet 1 into measured force data, and send the measured force data to the measured force display for display.

[0066] In this embodiment, the displacement sensor is specifically a laser displacement sensor 5, which has the characteristics of small size and accurate measurement.

[0067] As an optional implementation, when the curved cantilever beam 9 is in a horizontal state, the cantilever beam magnet 1 is located directly below the fixed magnet 3.

[0068] As an optional implementation method, refer to Figure 1 The frame 6 is a box structure with one open side, including a bottom plate, side walls and a top plate; the curved clamp 8 is installed on the side wall of the frame 6 by screws. There are no specific requirements for the type, material and quantity of screws, as long as they can be easily disassembled, can be firmly fixed on the frame 6 and can adjust the gap required for the cantilever beam by adjusting the tightness of the bolts.

[0069] The magnet mounting bracket 2 is installed on the lower surface of the top plate by screws and is located near the opening of the frame 6 housing. The magnet mounting bracket 2 has a groove in which the fixing magnet 3 is embedded.

[0070] The curved portion of the curved cantilever beam 9 is located within the housing space of the frame 6, extending all the way to below the fixed magnet 3, without exceeding the frame 6; a force-measuring scale 4 is provided at the opening of the housing of the frame 6 and on the bottom plate of the frame 6. The force-measuring scale 4 can be integrally formed with the frame 6, ensuring that its hardness and rigidity meet the requirements and that it is not easily bent or deformed, thus ensuring the accuracy of the weighing sensor readings during long-term use.

[0071] As an optional implementation, the curved clamp 8 is made of acrylic, which has good transparency, chemical stability, and weather resistance, and is low in cost and lightweight, thus reducing the overall weight of the weighing sensor and facilitating handling and movement. In other embodiments, the curved clamp 8 can be made of metal, robust wood, or other composite materials.

[0072] As an optional implementation, the curved cantilever beam 9 is made of metal, preferably corrosion-resistant and non-magnetic SUS316 stainless steel.

[0073] The working principle of this invention is as follows: In the initial state, due to the magnetic attraction between the cantilever beam magnet 1 and the fixed magnet 3, the curved cantilever beam 9 bends upward to the initial state located at the scale ON. At this time, the curved cantilever beam 9 is in contact with the curved clamp 8 due to the bending action, making the effective length of the curved cantilever beam 9 the shortest, that is, the sensitivity is the lowest. When the force to be measured is applied vertically downward along the tip of the curved cantilever beam 9, the tip of the curved cantilever beam 9 deflects downward along the direction of the force. However, since the displacement of the tip of the curved cantilever beam 9 does not change much with the change of force, the sensitivity of the curved cantilever beam 9 is low. However, as the force being measured gradually increases, the portion of the curved cantilever beam 9 that is in contact with the curved clamp 8 becomes smaller and smaller, that is, the effective length of the curved cantilever beam 9 gradually increases. When the force changes slightly, the displacement of the tip of the curved cantilever beam 9 changes significantly, which means that the sensitivity is gradually increasing. When the curved cantilever beam 9 approaches a horizontal state, the force measured is at its maximum, and the curved cantilever beam 9 also reaches its maximum effective length, that is, the maximum sensitivity. This achieves the purpose of the present invention: as the force gradually increases, the sensitivity of the weighing sensor gradually increases, and the sensitivity changes with the magnitude of the force.

[0074] In the final state, the applied force to be measured should be balanced by the magnetic force generated by the magnet, that is, the maximum force that the load cell reaches within its measuring range when the curved cantilever beam 9 is in a horizontal position. The magnitude of this maximum force is equal to the magnitude of the magnetic force generated between the fixed magnet 3 and the tip magnet of the curved cantilever beam 9 at this time. (Refer to...) Figure 4 The load cell changes the effective length of the curved cantilever beam 9 by changing the magnitude of the measured force, which in turn changes the stiffness of the sensor and further alters its sensitivity, thus achieving the purpose of variable sensitivity.

[0075] The sensitivity-varying load cell of this application has a simple and reliable structure. It is ideally suited for measuring minute changes in force on top of a large measured force. The introduction of the curved clamp 8 satisfies the requirement for supporting cantilever beams without needing other devices to improve sensitivity. It combines the high sensitivity of low-stiffness sensors with the wide measurement range of high-stiffness sensors. Therefore, this device is highly suitable for measuring minute load changes on a large preload. When used to measure force magnitude, the load cell can achieve a larger measurement range by enlarging its dimensions, providing a good basis for optimized design based on actual applications.

[0076] Those skilled in the art will recognize that the embodiments described herein are intended to help the reader understand the principles of the invention, and should be understood that the scope of protection of the invention is not limited to such specific statements and embodiments. Those skilled in the art can make various other specific modifications and combinations based on the technical teachings disclosed in this invention without departing from the spirit of the invention, and these modifications and combinations are still within the scope of protection of this invention.

Claims

1. A load cell with varying sensitivity, characterized in that, The weighing sensor includes a frame, a curved clamp, a curved cantilever beam, a fixed magnet, a cantilever beam magnet, and a force display device. The curved fixture is mounted on the frame, one end of the curved cantilever beam is mounted in the curved fixture, and the other end of the curved cantilever beam is mounted with a cantilever beam magnet. The fixed magnet is mounted on the frame and positioned above the cantilever beam magnet; the cantilever beam magnet is attracted by the fixed magnet, causing the curved cantilever beam to bend upwards; The force display device is mounted on the frame.

2. The load cell with varying sensitivity as described in claim 1, characterized in that, The curved fixture includes an upper fixture and a lower fixture; one end of the curved cantilever beam is disposed between the upper fixture and the lower fixture, the lower surface of the upper fixture is curved, and the curved surface fits against the curved cantilever beam.

3. The load cell with varying sensitivity as described in claim 1, characterized in that, The weighing sensor also includes a clamp support frame, which includes at least one bolt or screw, and the curved clamp is mounted on the frame by the bolt or screw.

4. The load cell with varying sensitivity as described in claim 1, characterized in that, The weighing sensor also includes a magnet holder, which is mounted on the frame and located above the cantilever beam magnet, and the fixed magnet is mounted on the magnet holder.

5. The load cell with varying sensitivity as described in claim 1, characterized in that, The force display device is a force scale, which is located on one side of the cantilever beam magnet.

6. The load cell with varying sensitivity as described in claim 5, characterized in that, The initial position of the cantilever beam magnet corresponds to the 0N scale line of the force being measured; when the curved cantilever beam is in a horizontal state, the position of the cantilever beam magnet corresponds to the maximum range scale line of the force measuring scale.

7. The load cell with varying sensitivity as described in claim 1, characterized in that, The weighing sensor also includes a displacement sensor disposed below the cantilever beam magnet, the displacement sensor being used to acquire position data of the cantilever beam magnet; The force display device includes a processor and a force display. The processor is used to convert the position data of the cantilever beam magnet into measured force data, and send the measured force data to the measured force display; The force display is used to display the force data being measured.

8. The load cell with varying sensitivity as described in claim 1, characterized in that, When the curved cantilever beam is in a horizontal state, the cantilever beam magnet is located directly below the fixed magnet.

9. The load cell with varying sensitivity as described in claim 1, characterized in that, The curved clamp is made of acrylic.

10. The load cell with varying sensitivity as described in claim 1, characterized in that, The curved cantilever beam is made of metal.

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