Integrated unbalance loading adjusting structure of electromagnetic force sensor

Abstract

The utility model discloses an integrated unbalance loading adjusting structure of an electromagnetic force sensor, which relates to the technical field of sensors and comprises a connecting body arranged at the tail end of an upper attaching plate in the electromagnetic force sensor; the extension plate is arranged at one end of the connecting body; the adjusting lever is arranged below the extension plate, a fulcrum connected with the electromagnetic force sensor is arranged at the bottom of one end of the adjusting lever, and a supporting structure point connected with the bottom of one end of the extension plate is arranged at the bottom of one end of the adjusting lever; and the adjusting mechanism is arranged at the top end of the other end of the adjusting lever in a penetrating manner so as to adjust the adjusting lever. According to the utility model, through linkage matching among the connecting body, the extension plate, the adjusting lever, the fulcrum and the supporting structure point, under the adjusting action of the adjusting mechanism, through a series of displacement transmission, the precise adjustment of the parallel attached plate structure is achieved, and meanwhile, the side effect stress generated by the adjusting action is relieved and released.

Description

Technical Field

[0001] This utility model relates to the field of sensor technology, and more specifically, to an integrated off-center load adjustment structure for an electromagnetic force sensor. Background Technology

[0002] Both electronic balances and weight mass comparators are high-precision measuring instruments used to measure the mass of substances. However, mass comparators are more specifically designed for measuring the mass of weights and have higher accuracy requirements for single-point measurements. Balances, on the other hand, are applicable to all ranges within their own measurement range. But both balances and comparators share a key technical requirement: their "off-center loading error" must be sufficiently small. This parameter determines whether the instrument can achieve high-precision measurement.

[0003] Their core unit is an electromagnetic force sensor, containing a complex lever structure responsible for transmitting electromagnetic force, ultimately achieving balance with the force at the measured end. The force-bearing end has a weighing pan structure to support the object being measured. Since the weighing pan has a certain surface area, it cannot be guaranteed that the object will be placed in the same position multiple times. Therefore, the load-bearing structure of the electromagnetic force sensor adopts the Roberval principle to ensure that the weighing result is not affected by the position of the object or weights on the weighing pan.

[0004] The Robewell structure, applied in electromagnetic force sensors, evolves into two parallel thin plates, referred to as the upper and lower plates. These two plates form parallel surfaces, one end connected to a vertically loaded structure via a soft elastomer, and the other end connected to a fixed support via the same soft elastomer, forming a parallelogram structure corresponding to the Robewell principle. However, due to limitations in manufacturing processes, the parallel plate structures produced cannot achieve perfect parallelism. Whether assembled or integrally molded in a single module, the ideal parallelism cannot be achieved. Therefore, a high-precision leveling structure is needed to fine-tune one plane to achieve perfect parallelism with the other, enabling the ideal application of the Robewell structure. This ensures accurate mass measurements at different locations on the weighing pan.

[0005] The application principle of Robowell in electromagnetic force sensors is as follows: Figure 5 The schematic diagram of the parallel structure application shown includes a weighing pan 9, a load-bearing structure 10, a soft elastomer 11, a parallel attachment plate 12, an integrated off-center load adjustment structure 13, and a fixing part 14. The soft elastomers 11 are R1, R2, R3, and R4, and the parallel attachment plate 12 is composed of an upper parallel attachment plate L1 and a lower parallel attachment plate L2.

[0006] The load-bearing structure is connected to an electromagnetic force coil via a crossbeam and a fulcrum (not shown in the diagram, only briefly described). When a weight is placed in the weighing pan 9, the electromagnetic coil, adjusted by a PID controller, generates an electromagnetic force that balances the weight of the object at the other end of the fulcrum. Data representing the weight is obtained by detecting the electromagnetic force.

[0007] The application of Robewell's principle in the sensors of electronic balances and mass comparators, with a schematic diagram of the deformed structure shown below. Figure 5 The key lies in the relative parallelism of L1 and L2 in the fixed part 14. The higher the parallelism, the more consistent the results displayed by the instrument for weights placed in different positions on the weighing pan, that is, the smaller the off-center load error, and the higher the accuracy of weighing.

[0008] The integrated off-center load adjustment structure 13 in the diagram is crucial. It is responsible for fine-tuning the parallelism of L1 and L2, ensuring perfect parallelism between L1 and L2 in the fixed part 14, thus meeting the requirements of the high-precision electromagnetic force sensor for off-center load error. This, in turn, forms a high-precision electronic balance and mass comparator.

[0009] Furthermore, in single-module sensors, the upper attachment plate, also known as the rear end, is adjusted to achieve parallelism with the lower attachment plate, thus applying the Robertwell principle. Previously, a double-screw structure was used; one screw pushes upwards, causing the rear end of the attachment plate to shift upwards, and if downward adjustment is needed, the other screw pulls downwards, causing the attachment plate to move downwards. The two screws interact to achieve parallel adjustment. However, for high-precision electromagnetic force sensors, the direct action of the threads still produces a relatively large offset, easily leading to overshoot during off-center load error adjustment. Additionally, due to the failure of the single sensor, the thread fit gradually loosens over time, causing slight changes in the parallelism of the attachment plates, which also increases the off-center load error.

[0010] There are currently no effective solutions to the problems in the relevant technologies. Utility Model Content

[0011] In view of the problems in the related technologies, this utility model proposes an integrated off-center load adjustment structure for electromagnetic force sensors to overcome the above-mentioned technical problems existing in the existing related technologies.

[0012] Therefore, the specific technical solution adopted by this utility model is as follows:

[0013] An integrated off-center load adjustment structure for an electromagnetic force sensor includes: a connecting body disposed at the end of an upper plate of the electromagnetic force sensor; an extension plate disposed at one end of the connecting body; an adjustment lever disposed below the extension plate, with a fulcrum for connecting the electromagnetic force sensor at one end of the adjustment lever and a support structure point for connecting the extension plate at one end of the adjustment lever; and an adjustment mechanism disposed through the top of the other end of the adjustment lever to adjust the adjustment lever.

[0014] Furthermore, in order to strengthen the connection between the front and rear sections and avoid direct connection between the front and rear sections, and to adjust the adverse effects caused by changes in the height of the connecting body at the support structure point, several tension relief grooves are opened at one end of the top of the extension plate, and tension relief holes are opened on the side wall of one end of the extension plate; a through hole that cooperates with the adjustment mechanism is opened at the top of the other end of the extension plate.

[0015] Furthermore, in order to allow the adjusting lever to adjust the connecting body by adjusting the left and right sides of the adjusting mechanism, the cross-section of the adjusting lever is Z-shaped, and a threaded hole is provided at the top of the other end of the adjusting lever.

[0016] Furthermore, in order to adjust the adjusting lever, the thread difference between the external and internal threads can be converted into the height difference of the connecting body. The adjusting mechanism includes an adjusting nut that passes through and is located at the top of the other end of the adjusting lever. The top of the adjusting nut is provided with a hexagonal head. The adjusting nut has a fixing screw connected to an electromagnetic force sensor inside. The outer side of the adjusting nut is provided with an external thread that mates with a threaded hole, and the inner side of the adjusting nut is provided with an internal thread that mates with the fixing screw. There is a thread difference between the external and internal threads.

[0017] Furthermore, in order to achieve the proper installation of the adjustment mechanism, the diameter of the through hole is larger than the diameter of the external thread.

[0018] The beneficial effects of this utility model are as follows:

[0019] 1. The linkage between the connecting body, extension plate, adjusting lever, fulcrum, and supporting structure point of this utility model enables precise adjustment of the parallel plate structure through a series of displacement transmissions under the adjustment action of the adjustment mechanism, while alleviating and releasing the side effects stress generated by the adjustment action.

[0020] 2. By setting tension relief grooves and tension relief holes, the strength of the connection between the front and rear can be strengthened, while avoiding direct connection between the front and rear. It can also adjust the adverse effects caused by the height difference of the connector at the support structure point.

[0021] 3. By setting an adjustment mechanism, the adjustment lever can be adjusted, which can convert the thread difference between the external thread and the internal thread into the height distance of the connecting body.

[0022] 4. This invention improves the accuracy and stability of off-center loading errors in electronic balances and weight mass comparators based on electromagnetic force sensors, enhancing measurement accuracy. It is also simple to manufacture, adaptable in size to various sensor specifications. The structure is easy to adjust and offers high precision, making it particularly suitable for high-precision sensor applications. It overcomes the limitations of existing adjustment structures that cannot accommodate even higher precision sensors. This promotes the development of higher-precision sensors and the overall advancement of electronic analytical balances and F2 and higher mass comparators. Attached Figure Description

[0023] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0024] Figure 1 This is a schematic diagram of an integrated off-center load adjustment structure for an electromagnetic force sensor according to an embodiment of the present invention, applied to an electromagnetic force sensor.

[0025] Figure 2 yes Figure 1 A magnified view of a section at point A in the middle;

[0026] Figure 3 This is a side view of an integrated off-center load adjustment structure for an electromagnetic force sensor according to an embodiment of the present invention, applied to an electromagnetic force sensor.

[0027] Figure 4 yes Figure 3 A magnified view of a section at point B in the middle;

[0028] Figure 5 This is a schematic diagram illustrating the application of the parallel structure in an integrated off-center load adjustment structure for an electromagnetic force sensor according to an embodiment of the present invention.

[0029] Figure 6 This is a schematic diagram of the adjustment motion principle in an integrated off-center load adjustment structure for an electromagnetic force sensor according to an embodiment of the present utility model.

[0030] Figure 7 This is a schematic diagram illustrating the principle of tension relief in an integrated off-center load adjustment structure for an electromagnetic force sensor according to an embodiment of the present invention.

[0031] In the picture:

[0032] 1. Connector; 2. Upper plate; 3. Extension plate; 301. Tension relief groove; 302. Tension relief hole; 303. Through hole; 4. Adjusting lever; 401. Threaded hole; 5. Fulcrum; 6. Support structure point; 7. Adjustment mechanism; 701. Adjusting nut; 702. Hexagonal head; 703. Fixing screw; 8. Electromagnetic force sensor; 9. Weighing pan; 10. Force-bearing structure; 11. Soft elastomer; 12. Parallel plate; 13. Integrated off-center load adjustment structure; 14. Fixing part. Detailed Implementation

[0033] To further illustrate the various embodiments, the present invention provides accompanying drawings, which are part of the disclosure of the present invention. These drawings are mainly used to illustrate the embodiments and can be used in conjunction with the relevant descriptions in the specification to explain the operating principles of the embodiments. With reference to these contents, those skilled in the art should be able to understand other possible implementation methods and the advantages of the present invention. The components in the figures are not drawn to scale, and similar component symbols are usually used to represent similar components.

[0034] According to an embodiment of the present invention, an integrated off-center load adjustment structure for an electromagnetic force sensor is provided.

[0035] It should be noted that the integrated off-center load adjustment structure of the electromagnetic force sensor is respectively located at the ends of the upper plates 2 on both sides of the electromagnetic force sensor 8 structure. Through the adjustment of these two structures, the height of the rear of the upper plates 2 can be offset, thereby improving the parallelism of the upper and lower plates. This integrated off-center load adjustment structure of the electromagnetic force sensor is integrally milled from aluminum alloy or other alloys. In the sensor of the single module, this part of the structure is integrally milled with the single module.

[0036] The present invention will now be further described in conjunction with the accompanying drawings and specific embodiments, such as... Figures 1-4 As shown, the integrated off-center load adjustment structure of the electromagnetic force sensor according to an embodiment of the present invention includes: a connecting body 1, disposed at the end of the upper plate 2 of the electromagnetic force sensor 8; an extension plate 3, disposed at one end of the connecting body 1; an adjusting lever 4, disposed below the extension plate 3, with a fulcrum 5 connected to the electromagnetic force sensor 8 at the bottom of one end of the adjusting lever 4, and a support structure point 6 connected to the bottom of one end of the extension plate 3 at the bottom of one end of the adjusting lever 4; and an adjustment mechanism 7, which is disposed through the top of the other end of the adjusting lever 4 to adjust the adjusting lever 4.

[0037] Specifically, to achieve smoother adjustment and more stable off-center load performance, this utility model provides an integrated off-center load adjustment structure for electromagnetic force sensors. It adopts a proportionally scaled-down structure for more precise fine-tuning; combined with a parallel deformation structure to reduce stress generated during adjustment, it improves the stability of the electromagnetic force sensor. This structure can be used as a standalone off-center load adjustment module in conjunction with a separate component electromagnetic force sensor, or it can be manufactured together with a single-module electromagnetic force sensor and integrated into a single unit.

[0038] It should be noted that the fulcrum 5 adopts a relatively weak design structure to ensure that the adjusting lever 4 will not deform when torque is applied.

[0039] The adjusting lever 4 is a flat plate structure milled into it. By adjusting the rotation of the adjusting mechanism 7, the adjusting lever 4 rotates at a small angle under the action of the fulcrum 5, and moves up and down within a certain range at the supporting structure point 6.

[0040] With the help of the above-mentioned technical solution of this utility model, the linkage between the connecting body 1, the extension plate 3, the adjusting lever 4, the fulcrum 5, and the supporting structure point 6 can achieve precise adjustment of the parallel plate structure through a series of displacement transmissions under the adjustment action of the adjusting mechanism 7, while alleviating and releasing the side effects stress generated by the adjustment action.

[0041] In one embodiment, for the aforementioned extension plate 3, a plurality of tension relief grooves 301 are provided at one end of the top of the extension plate 3, and tension relief holes 302 are provided on the side wall of one end of the extension plate 3; a through hole 303 that cooperates with the adjustment mechanism 7 is provided at the top of the other end of the extension plate 3. The diameter of the through hole 303 is larger than the diameter of the external thread, thereby strengthening the connection between the front and rear ends and avoiding direct connection between the front and rear ends. It can adjust the adverse effects caused by the height change of the connecting body 1 at the support structure point 6.

[0042] In one embodiment, the cross-section of the adjusting lever 4 is Z-shaped, and a threaded hole 401 is provided at the top of the other end of the adjusting lever 4.

[0043] In one embodiment, the adjustment mechanism 7 includes an adjusting nut 701 that passes through the top end of the other end of the adjusting lever 4. The top end of the adjusting nut 701 is provided with a hexagonal head 702. The interior of the adjusting nut 701 is provided with a fixing screw 703 that is connected to the electromagnetic force sensor 8. The outer side of the adjusting nut 701 is provided with an external thread that mates with the threaded hole 401, and the inner side of the adjusting nut 701 is provided with an internal thread that mates with the fixing screw 703. There is a thread difference between the external thread and the internal thread, thereby realizing the adjustment of the adjusting lever 4. The thread difference between the external thread and the internal thread can be converted into the height distance of the connecting body 1.

[0044] It should be noted that the adjusting mechanism 7 is a structure with double threads. Assume an internal thread Mn and an external thread Mm, with a thread difference between the two threads. The internal thread engages with the internal screw thread Mn, and the internal screw is fixed to the individual sensor. The external thread Mm engages with the threaded hole 401 of the adjusting lever 4. The through hole 303 is a through hole to avoid the adjusting screw. When the adjusting nut 701 is rotated, due to the thread difference, the external thread Mm will cause the adjusting lever 4 to move up and down.

[0045] By adjusting the adjusting nut 701 with double threads, the distance of the thread difference is converted into the height distance of the connecting body 1 structure, achieving precise adjustment.

[0046] Let ML be the thread difference between the internal thread Mn and the external thread Mm. The distance of each turn of the adjusting nut 701 is finely reduced, which can be achieved as: ML*M2 / M1.

[0047] When adjusting the adjusting nut 701, a force is applied to the overall structure of the connecting body 1, causing deformation at the support structure point 6. For example, when the support structure point 6 moves upward, the fulcrum 5 experiences an upward force, which causes the end of M1 to deform upward. M1 is a milled metal plate structure connected to the sensor on both sides, as shown in the parallel structure application diagram. In front of the support structure point 6, there are two thin-walled soft elastic bodies, R1 and R2, which are related to sensing performance. Since there is no other place to alleviate this upward force, the soft elastic bodies R1 and R2 experience tensile tension. This effect is a negative factor for electromagnetic force sensors, hindering high-performance product achievement, and vice versa.

[0048] Specifically, the tension relief groove 301 and tension relief hole 302 are structures designed to alleviate the aforementioned forces. They are additional parallel structures used in conjunction with eccentric load adjustment to relieve and release the tension generated at support point 6 on parallel plates 12M1 (R1 and R2). Each of the upper and lower parallel surfaces can have two curved weak points to release stress, similar to the two weak points R1 and R2 in the parallel structure application diagram. Alternatively, they can be two thin parallel planar structures. When support point 6 experiences upward or downward force, this parallel structure will undergo misalignment deformation at the weak points, releasing the force acting on parallel plates 12R1 and R2, thus relieving the tension at R1 and R2. A schematic diagram illustrating the tension relief principle of the tension relief groove 301 and tension relief hole 302 is shown below. Figure 7 As shown, it specifically includes:

[0049] By utilizing the double parallel weak structure, the strength of the connection between the front and rear is enhanced, while avoiding the adverse effects caused by the change in height at the support structure point 6 when adjusting the connection between the front and rear plates.

[0050] To facilitate understanding of the above-mentioned technical solutions of this utility model, the working principle or operation method of this utility model in actual process will be described in detail below.

[0051] In practical applications, the slight vertical offset at the end connection of the extension plate 3 and the connector 1 is the key position to improve the parallelism of the upper plate 2 and the lower plate. Here, the slight vertical offset occurs with the adjustment of the off-center load structure. The support structure point 6 is the support point for the pull-down or push-up of the end of the connector 1.

[0052] When the adjusting nut 701 is rotated via the hexagonal head 702, a thread difference is generated between the external and internal threads. This thread difference causes the adjusting lever 4 to rotate, which in turn causes the support structure point 6 to move. The movement of the support structure point 6 then causes the end of the connecting body 1 to move up and down. Under the combined action of the support structure point 6, the fulcrum 5, and the adjusting mechanism 7, by selecting appropriate positions and proportional relationships among the three, such as... Figure 6 M2 / M1 in the figure allows for high-precision adjustment of the vertical movement of the end of connector 1. Extension plate 3, as an extension of connector 1, remains connected to the rear sensor fixing part, maintaining the tensile strength of connector 1. The specific adjustment principle is as follows: Figure 6 As shown.

[0053] In summary, by utilizing the above-mentioned technical solution of this utility model, the linkage between the connecting body 1, extension plate 3, adjusting lever 4, fulcrum 5, and support structure point 6 enables precise adjustment of the parallel auxiliary plate structure through a series of displacement transmissions under the adjustment action of the adjusting mechanism 7, while simultaneously alleviating and releasing the side effects stress generated by the adjustment action. By setting tension relief groove 301 and tension relief hole 302, the strength of the connection between the front and rear can be strengthened, while avoiding direct connection between the front and rear, thus adjusting the adverse effects caused by the height variation of the connecting body 1 at the support structure point 6. By setting the adjusting mechanism 7, the adjustment lever 4 can be adjusted, converting the thread difference between the external and internal threads into the height distance of the connecting body 1. This utility model can improve the accuracy and stability of the off-center load error of electronic balances and weight mass comparators with electromagnetic force sensors as the core, improve measurement accuracy, and is simple to manufacture, with a size that can be adjusted to accommodate different sensor specifications. This structure is easy to adjust and has high adjustment accuracy, making it particularly suitable for high-precision sensor applications. It solves the shortcomings of the original adjustment structure that cannot adapt to higher precision sensors. This has promoted the development of higher precision sensors and the overall development of electronic analytical balances and mass comparators of F2 (precision class designation of weights) and above.

[0054] In this utility model, unless otherwise explicitly specified and limited, the terms "installation", "setting", "connection", "fixing", "screw connection", etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal connection 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 utility model according to the specific circumstances.

[0055] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. An integrated off-center load adjustment structure for an electromagnetic force sensor, characterized in that, include: Connector (1) is located at the end of the upper plate (2) of the electromagnetic force sensor (8); An extension plate (3) is disposed at one end of the connector (1); An adjusting lever (4) is set below the extension plate (3), and a fulcrum (5) connected to an electromagnetic force sensor (8) is provided at the bottom of one end of the adjusting lever (4), and a support structure point (6) connected to the bottom of one end of the extension plate (3) is provided at the bottom of one end of the adjusting lever (4). An adjustment mechanism (7) is provided at the top of the other end of the adjustment lever (4) to adjust the adjustment lever (4).

2. The integrated off-center load adjustment structure for an electromagnetic force sensor according to claim 1, characterized in that, The extension plate (3) has a plurality of tension relief grooves (301) at one end of its top end, and a tension relief hole (302) is provided on one side wall of the extension plate (3). The other end of the extension plate (3) has a perforation (303) that cooperates with the adjustment mechanism (7).

3. The integrated off-center load adjustment structure for an electromagnetic force sensor according to claim 2, characterized in that, The other end of the adjusting lever (4) has a threaded hole (401).

4. The integrated off-center load adjustment structure for an electromagnetic force sensor according to claim 3, characterized in that, The adjustment mechanism (7) includes an adjustment nut (701) with internal and external threads that is disposed through the top end of the other end of the adjustment lever (4), and the top end of the adjustment nut (701) is provided with a hexagonal head (702). The adjusting nut (701) has a fixing screw (703) inside that is connected to the electromagnetic force sensor (8).

5. The integrated off-center load adjustment structure for an electromagnetic force sensor according to claim 4, characterized in that, The adjusting nut (701) has an external thread on its outer side that mates with the threaded hole (401), and an internal thread on its inner side that mates with the fixing screw (703).

6. The integrated off-center load adjustment structure for an electromagnetic force sensor according to claim 5, characterized in that, There is a thread difference between the external thread and the internal thread.

7. The integrated off-center load adjustment structure for an electromagnetic force sensor according to claim 5, characterized in that, The diameter of the perforation (303) is larger than the diameter of the external thread.

Images