Measuring system, quality comparator and measuring method

Abstract

The invention relates to the technical field of measurement, and discloses a measurement system, a mass comparator and a measurement method, and the measurement system comprises a balance beam assembly, a load detection module, a first variable balance module, a second variable balance module and a cooperative control module. The first end of the balance beam assembly is connected with a bearing part for bearing an object to be measured, and the second end corresponds to the reference load end. The load detection module is used for detecting the weight of a detected object on the bearing part in real time and outputting a detection signal. A first variable balance module and a second variable balance module are arranged at the two ends of the balance beam assembly and used for applying balance loads to the balance beam assembly. Wherein the cooperative control module receives the detection signal and generates a corresponding control signal so as to adjust the first balance load and the second balance load and dynamically adjust the measurable range of the comparator, so that the weight of the object to be measured falls into the measurable range, and the high-precision and wide-range measurement requirements of the comparator are ensured.

Description

Technical Field

[0001] This application relates to the field of mass measurement technology, and further relates to a measurement system, a mass comparator, and a measurement method. Background Art

[0002] In the field of mass measurement, as a key precision measurement instrument, the mass comparator has a significant impact on the production and scientific research activities of many industries. At present, the widely used mass comparator that adopts the electromagnetic force compensation technology, the core principle of the electromagnetic force compensation technology is: when the object to be measured is placed on the weighing pan of the mass comparator, the gravity of the object causes the balance beam to displace. At this time, rely on the sensor to detect the position change of the balance beam, and then generate an electromagnetic force that balances the gravity of the object to be measured through the electromagnetic force compensation technology, so as to make the balance beam assembly return to the initial balance position, and then by measuring the magnitude of this electromagnetic force, the mass of the object to be measured can be determined.

[0003] However, in actual use, the measurement range and accuracy of the existing mass comparator are often limited by the characteristics of the sensor itself. For example, when the mass of the object to be measured is relatively large, if it is necessary to expand the measurement range, the sensor needs to be able to detect signal changes in a larger range. However, as the range increases, the accuracy of the sensor will inevitably decrease, because in a large measurement range, achieving high-precision measurement requires extremely high manufacturing processes and technologies for the sensor, thus making it difficult to simultaneously achieve the wide-range and high-precision performance of the mass comparator. Summary of the Invention

[0004] Aiming at the above technical problems, the purpose of this application is to provide a measurement system, a mass comparator, and a measurement method, which can realize the measurement of objects to be measured with different masses through a bilateral variable counterweight method, and effectively broaden the measurement range of the mass comparator.

[0005] To achieve the above purpose, this application provides a measurement system for a mass comparator, including:

[0006] A balance beam assembly with a first end and a second end arranged opposite to each other. The first end is connected to the bearing part in the mass comparator for carrying the object to be measured, and the second end corresponds to the reference load end of the mass comparator;

[0007] A load detection module for real-time detecting the weight of the object to be measured on the bearing part and outputting a detection signal;

[0008] A first variable counterweight module is arranged at the first end and can dynamically adjust the first counterweight load applied to the first end;

[0009] A second variable counterweight module is arranged at the second end and can dynamically adjust the second counterweight load applied to the second end;

[0010] A collaborative control module is respectively connected to the load detection module, the first variable counterweight module, and the second variable counterweight module. The collaborative control module is configured to generate a control signal based on the detection signal to adjust the first counterweight load and the second counterweight load, thereby adjusting the measurable range of the mass comparator so that the weight of the object to be measured can fall within the measurable range.

[0011] In some embodiments, the load detection module includes:

[0012] A load cell is disposed at the connection between the bearing portion and the balance beam assembly for measuring the actual weight of the object to be measured;

[0013] A signal processing unit is connected to the load cell for converting the actual weight into a digital weight signal and transmitting it to the collaborative control module.

[0014] In some embodiments, the first variable counterweight module and / or the second variable counterweight module includes:

[0015] A plurality of discrete counterweight weights, each of the counterweight weights having a preset nominal mass value;

[0016] A weight loading mechanism for loading a specific number or combination of the counterweight weights to the corresponding end of the balance beam assembly according to the control instruction.

[0017] In some embodiments, the weight loading mechanism includes a bearing base, a power mechanism, and an actuator; the power mechanism and the actuator are cooperatively connected, the power mechanism can drive the actuator to move, and the actuator is used to move or load or unload the counterweight weights;

[0018] There is a transfer path between the bearing base and the balance beam assembly to realize the transfer of the counterweight weights between the bearing base and the balance beam assembly.

[0019] In some embodiments, the balance beam assembly is provided with a mounting seat, the bearing base is provided with a plurality of weight positioning grooves, the weight positioning grooves are arranged in a stepped manner along the height direction of the bearing base, each of the weight positioning grooves can accommodate at least one of the counterweight weights, the counterweight weights and the mounting seat are sleeved, and the bearing base is cooperatively connected with the actuator;

[0020] When driven by the actuator, the bearing base moves synchronously, so that the counterweight weights in the bearing base can be correspondingly docked to the mounting seat to complete loading, or separated from the mounting seat for unloading.

[0021] In some embodiments, the counterweight is successively sleeved on the outer periphery of the actuating element, and the power mechanism can drive the actuating element to drive the counterweight to lift or lower. At least two protrusions are arranged on the actuating element along the length direction;

[0022] One of the protrusions is located at the end of the actuating element away from the power mechanism, and is used to prevent the counterweight from falling off the actuating element. Each protrusion can bear the corresponding counterweight. In the first state, the protrusion is in contact with the counterweight, so that the counterweight can lift or lower synchronously when the actuating element moves; in the second state, the protrusion is separated from the counterweight, so that the corresponding counterweight can abut against the balance beam assembly to complete the load loading.

[0023] In some embodiments, the cooperative control module is configured to judge whether the weight of the current object under test exceeds the measurable range according to the detection signal;

[0024] If it exceeds the measurable range, a counterweight adjustment instruction is generated to control the first variable counterweight module and the second variable counterweight module to synchronously adjust the corresponding counterweight loads, so that the weight of the object under test is adapted to the measurable range;

[0025] The counterweight adjustment instruction includes:

[0026] When the weight of the object under test exceeds the upper limit of the measurable range, control the first variable counterweight module and the second variable counterweight module to synchronously increase the corresponding counterweight loads; or, control the first variable counterweight module to decrease the counterweight load and control the second variable counterweight module to increase the counterweight load;

[0027] When the weight of the object under test is lower than the lower limit of the measurable range, control the first variable counterweight module and the second variable counterweight module to synchronously reduce the corresponding counterweight loads; or, control the first variable counterweight module to increase the counterweight load and control the second variable counterweight module to decrease the counterweight load.

[0028] On the other hand, the present application also provides a mass comparator, including:

[0029] The above measurement system;

[0030] A bearing part for bearing the object to be measured;

[0031] A sensor for detecting the tilt angle or position change of the balance beam assembly and generating a corresponding displacement signal;

[0032] An electromagnetic force generating device acts on the balance beam assembly and is configured to generate an electromagnetic force based on the displacement signal to adjust the balance state of the balance beam assembly through the electromagnetic force;

[0033] An output unit is configured to calculate and obtain the actual weight of the object to be measured based on the electromagnetic force.

[0034] In some embodiments, a windproof structure is disposed around the outer periphery of the bearing portion, configured to form at least partial barriers outside the object to be measured after the object to be measured is placed on the bearing portion, for attenuating external air flow disturbances.

[0035] On the other hand, the present application also provides a measurement method. Based on the above mass comparator, the method includes the steps:

[0036] Obtain the weight of the object to be measured through the load detection module;

[0037] Determine whether the weight exceeds the current range threshold of the mass comparator;

[0038] If it exceeds the threshold range or does not reach the threshold range, generate a counterweight adjustment instruction to drive the first variable counterweight module and the second variable counterweight module to adjust the counterweight load;

[0039] After the balance beam assembly returns to the balanced state, calculate the actual weight value of the object to be measured based on the electromagnetic force generated by the electromagnetic force generating device.

[0040] Compared with the prior art, the measurement system, mass comparator and measurement method provided by the present application have the following beneficial effects:

[0041] The measurement system provided by the present invention adopts a bilateral variable counterweight design, which can dynamically adjust the counterweight loads at both ends of the balance beam, realize flexible expansion of the measurement range, improve the measurement efficiency and expand the application scope.

[0042] Secondly, through the linkage between the load detection module and the cooperative control module, the system realizes automatic counterweight adjustment, reduces human intervention, and improves the measurement accuracy and stability. The above settings enable the present invention to be applicable to a variety of measurement environments, can optimize the counterweight for objects to be measured with different mass ranges, and improve the applicability and measurement flexibility of the mass comparator, having wide application value. BRIEF DESCRIPTION OF THE DRAWINGS

[0043] The following will further illustrate the above characteristics, technical features, advantages and their implementation manners of the present application in a clear and understandable manner in combination with the drawings of the preferred embodiments.

[0044] Figure 1 is a schematic structural diagram of a measurement system in an embodiment of the present application;

[0045] Figure 2 It is a schematic structural diagram of a weight loading mechanism in an embodiment of the present application;

[0046] Figure 3 It is a schematic structural diagram of a weight loading mechanism in an embodiment of the present application;

[0047] Figure 4 It is a schematic overall structural diagram of a mass comparator in an embodiment of the present application;

[0048] Figure 5 It is a basic flowchart of a measurement method in an embodiment of the present application.

[0049] Explanation of reference numerals in the drawings: First variable counterweight module 1; Second variable counterweight module 2; Balance beam assembly 3; Mounting base 30; First end 31; Second end 32; Bearing part 4; Counterweight 50; Weight loading mechanism 51; Bearing base 511; Weight positioning groove 5110; Power mechanism 512; Actuating element 513; Protrusion 5131; Electromagnetic force generating device 6; Windproof structure 70. Detailed implementation manners

[0050] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will describe the specific implementation manners of the present application with reference to the accompanying drawings. Obviously, the accompanying drawings in the following description are only some embodiments of the present application. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained according to these drawings, and other implementation manners can be obtained.

[0051] To make the drawings concise, only the parts related to the application are schematically shown in each drawing, and they do not represent the actual structure of the product. In addition, to make the drawings concise and easy to understand, in some drawings, components with the same structure or function are only schematically shown one of them, or only one of them is marked. In this document, "one" not only means "only this one", but also means "more than one" situation.

[0052] It should also be further understood that the term "and / or" used in the specification and appended claims of the present application refers to any combination and all possible combinations of one or more of the associated listed items, and includes these combinations.

[0053] In this text, it should be noted that unless otherwise clearly specified and defined, the terms "install", "connect", and "join" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, and it can be the communication inside two components. For those of ordinary skill in the art, the specific meanings of the above terms in this application can be understood according to specific situations.

[0054] In the description of this application, it should be understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing this application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, so it cannot be understood as a limitation to this application.

[0055] In addition, in the description of this application, the terms "first", "second", etc. are only used for distinguishing descriptions and cannot be understood as indicating or implying relative importance.

[0056] In the field of mass measurement, as the core equipment for high-precision mass measurement, the performance of the mass comparator is crucial for the production and scientific research work in many industries. At present, many mass comparators adopt a measurement mechanism based on the principle of electromagnetic force balance. Although this principle is widely used, it has significant limitations, making it difficult for the mass comparator to simultaneously achieve a wide measurement range and high measurement accuracy.

[0057] For a mass comparator based on the principle of electromagnetic force balance, the working process is as follows: When the object to be measured is placed on the weighing pan of the mass comparator, the gravity causes the weighing pan to displace. After the sensor captures this displacement change, the system generates a corresponding electromagnetic force through the feedback circuit to cancel the gravity difference and make the balance beam return to its initial balanced state. In this process, the mass difference between the object to be measured and the reference weight is determined by measuring the magnitude of the generated electromagnetic force. However, the measurement range and sensitivity of the mass comparator restrict each other. When trying to expand the measurement range, due to the limitations of its own adjustment mechanism, the mass comparator is often difficult to ensure high-precision measurement at the same time, which makes it difficult for the same mass comparator to meet the diverse measurement requirements for different weight ranges.

[0058] On the other hand, when measuring a large-mass object to be measured, the electromagnetic force generating device needs to output a strong electromagnetic force, which not only significantly increases the energy consumption of the device, causing energy waste, but also when in a high-load working state for a long time, the magnetic components inside the sensor will be affected by problems such as heat generation, resulting in a serious impact on its long-term stability, and further interfering with the accuracy of the measurement result, reducing the reliability and service life of the mass comparator.

[0059] To solve the problems in the prior art, referring to the attached drawings of the specification Figure 1 , a measurement system provided by the present application is described. The measurement system provided by the present application has a bilateral balancing design, which can optimize the measurement range and simultaneously achieve the advantages of wide range and high precision measurement of the mass comparator.

[0060] Referring to the attached drawings of the specification Figure 1 , a measurement system provided by the present application includes a balance beam assembly 3, a load detection module, a first variable balancing module 1, a second variable balancing module 2, and a cooperative control module.

[0061] Among them, the balance beam assembly 3 has a first end 31 and a second end 32 arranged oppositely. The first end 31 is connected to the bearing part 4 inside the mass comparator to bear the object to be measured; the second end 32 corresponds to the reference load end of the mass comparator. It can be seen that the present invention provides variable balancing modules at both ends of the balance beam assembly 3, namely the first variable balancing module 1 and the second variable balancing module 2, so that the balancing load can be dynamically adjusted according to the mass of the object to be measured, enabling the balance beam assembly 3 to always be in an optimized balanced state.

[0062] The load detection module in the measurement system is used to detect the weight of the object to be measured on the bearing part 4 in real time and output a corresponding detection signal. The cooperative control module is connected to the load detection module, the first variable balancing module 1, and the second variable balancing module 2, and is used to generate a control signal based on the detection signal and adjust the first balancing load and / or the second balancing load accordingly.

[0063] It can be understood that by dynamically adjusting the balanced state, the system can automatically adapt to objects to be measured with different masses, enabling the weight of the object to be measured to fall within the measurable range of the mass comparator, thereby ensuring the measurement accuracy and effectively reducing human intervention.

[0064] In addition, the above-mentioned loads include two types: physical loads, such as solid balancing mass blocks (such as weights); virtual loads, such as equivalent loads generated based on electromagnetic force, pneumatic pressure, or hydraulic pressure. The core implementation method in the present application is to preferentially use physical load adjustment, that is, by loading or unloading balancing weights 50 on both sides, which can reduce the R & D and production costs, eliminate components such as drive circuits and heat dissipation modules in the related design of virtual loads, and ensure the thermal stability of the device.

[0065] Specifically, in this embodiment, the core purpose of the bilateral counterweight design is to achieve flexible expansion and precise adjustment of the measurable range of the mass comparator. The collaborative control module determines whether the weight of the current object under test exceeds the measurable range according to the detection signal; if it exceeds the measurable range, a counterweight adjustment instruction is generated to control the first variable counterweight module 1 and the second variable counterweight module 2 to synchronously adjust the corresponding counterweight loads, so that the weight of the object under test is adapted to the measurable range.

[0066] The above-mentioned counterweight adjustment instruction specifically includes: when facing an object under test with a larger weight (the weight of the object under test exceeds the upper limit of the measurable range), the collaborative control module can simultaneously control the first variable counterweight module 1 and the second variable counterweight module 2 to increase the counterweight load. By applying greater reverse forces synchronously at both ends of the balance beam, the balance beam assembly 3 can bear and balance an object under test with a greater weight, thereby achieving an upward expansion of the measurement range; conversely, when measuring an object under test with a smaller weight (the weight of the object under test is lower than the lower limit of the measurable range), such as a tiny electronic component, the collaborative control module controls the variable counterweight modules on both sides to reduce the counterweight load, reducing the acting forces at both ends of the balance beam, enabling the measurement system to accurately sense tiny weight changes and achieving a downward expansion of the measurement range.

[0067] Furthermore, the counterweight adjustment instruction can also be expanded. When facing an object under test with a larger weight (i.e., the weight of the object under test exceeds the upper limit of the measurable range), in some measurement scenarios, the collaborative control module can also control the first variable counterweight module 1 to reduce the counterweight load and control the second variable counterweight module 2 to increase the counterweight load, thereby further broadening the upper limit of the measurement range and avoiding unnecessary pressure on the structure caused by synchronous loading; on the contrary, when measuring an object under test with a smaller weight (i.e., the weight of the object under test is lower than the lower limit of the measurable range), the collaborative control module can choose to control the first variable counterweight module 1 to increase the counterweight load and control the second variable counterweight module 2 to reduce the counterweight load, further breaking through the limitation of the measurement lower limit and ensuring the high-precision measurement requirements for tiny mass objects.

[0068] Through the setting of bilateral counterweight and bilateral variable counterweight in this application, the adaptability of the mass comparator to objects under test with different weight ranges is greatly improved, the application scenarios are broadened, and diverse measurement requirements are met.

[0069] If the bilateral counterweight and bilateral variable counterweight design in this application are not adopted, some technicians may use a single-sided counterweight design in which standard weights are loaded at one end of the balance beam and the object under test is placed at the other end. This single-sided counterweight design has many drawbacks. Since weights are only loaded on one side, a large number of different specifications of weights need to be frequently replaced to match objects under test of different masses.

[0070] Moreover, if the unilateral balancing method is to achieve wide-range measurement, a large number of weights of different masses need to be stored. This not only greatly increases the cost of the equipment, but also makes the equipment bulky and occupies too much space. At the same time, when it is necessary to measure objects with a large mass range, since it can only be adjusted by adding or removing weights on one side, the operation process is extremely complicated, takes a lot of time, and greatly reduces the measurement efficiency.

[0071] In addition, the unilateral balancing makes the force on the balance beam more concentrated. During the measurement process, slight disturbances from the external environment, such as slight vibrations, airflow changes, etc., can easily have a significant impact on the balance state of the balance beam, causing large fluctuations in the measurement results, making it difficult to ensure the stability and reliability of the measurement.

[0072] It can be seen that the measurement system in this application has very outstanding and outstanding progress. It should be noted that in the existing field of mass comparators, sensors are key measuring components, and there is a mutually restrictive relationship between their accuracy and measurement range. In theory, when the measurement range increases, it is extremely difficult to ensure that high accuracy is maintained throughout the entire wide range. This is because within a large measurement range, the sensor is susceptible to a variety of complex interference factors, such as temperature fluctuations, which can cause the performance of electronic components inside the sensor to drift; mechanical vibrations may cause displacement or deformation of sensitive components of the sensor. These interference factors will eventually cause the measurement error to increase, which will seriously affect the accuracy of the sensor. Therefore, when pursuing wide-range measurements, traditional mass comparators often have to sacrifice accuracy, and it is difficult to meet the two important requirements of high accuracy and wide range at the same time.

[0073] The measurement system proposed in the present invention can simultaneously achieve the wide range and high precision of the mass comparator. Specifically, when performing large mass measurements, the first variable balancing module 1 and the second variable balancing module 2 can quickly load the appropriate balancing load according to the instructions of the collaborative control module. This operation effectively expands the measurement range of the mass comparator, so that the measurement process is no longer limited to the smaller range of the high-precision sensor itself, so that large mass objects can be accurately measured.

[0074] When measuring small masses, the collaborative control module will control the first variable balancing module 1 and the second variable balancing module 2 to unload the balancing load, so that the entire measurement system enters the light load mode. At this time, the high-precision sensor can give full play to its advantages and greatly improve the sensitivity and stability of the measurement. Taking the mass measurement of trace samples in scientific research experiments as an example, after unloading the balancing load, the measurable mass range is correspondingly reduced. At the same time, the sensor can accurately sense tiny mass changes and reduce measurement errors, so that large and small mass objects can be detected with one device, and the procurement cost of the factory or laboratory will be greatly reduced.

[0075] During the entire measurement process, the collaborative control module always dynamically adjusts the balancing loads of the first variable balancing module 1 and the second variable balancing module 2 according to the real-time data fed back by the load detection module to ensure that the sensor always works in the optimal measurement range. This intelligent control method effectively reduces measurement errors and successfully achieves the measurement goals of both high precision and wide range, completely breaking the dilemma between precision and range of traditional mass comparators.

[0076] In specific implementation, the first variable balancing module 1 and the second variable balancing module 2 can be implemented in different ways, for example, using an electromagnetic balancing structure, a stepper motor drive structure or a pneumatic / hydraulic adjustment system to achieve refined control of the balancing load. In addition, the collaborative control module can calculate the optimal balancing strategy for the objects under test in different mass ranges based on a preset algorithm to ensure measurement accuracy while optimizing response speed.

[0077] It should also be noted that, in some embodiments, the measurable range can be adjusted by adjusting the distance between the balancing action point and the fulcrum of the balance beam assembly 3. The balance beam assembly 3 follows the principle of levers, where force multiplied by the lever arm equals torque. When the distance between the balancing action point and the fulcrum changes, the torque generated by the same balancing load will also change accordingly. Specifically, the action point of the balancing load on the balance beam assembly 3 is adjusted. Moreover, this method can be coordinated with the method of adjusting the size of the balancing load, thereby forming a composite balancing mode in the measurement system.

[0078] In one embodiment, based on the above content, the load detection module includes a weighing sensor and a signal processing unit, wherein the weighing sensor is arranged at the connection between the load-bearing part 4 and the balance beam assembly 3 to ensure that the load changes applied by the object to be measured can be directly sensed, thereby improving the measurement accuracy.

[0079] Weighing sensors can use high-precision strain gauge sensors, which detect tiny deformations through strain gauges attached to elastic elements and convert deformations into electrical signals to achieve high-sensitivity measurement of the weight of the object to be measured. In addition, sensors based on capacitance changes or electromagnetic force balance principles can also be used to adapt to measurement applications with different accuracy requirements.

[0080] The signal processing unit is connected to the weighing sensor, and can convert the actual weight into a digital weight signal and transmit it to the collaborative control module in the above content, so that the collaborative control module can adjust the increase or decrease of the double-sided balancing load in real time according to the actual weight of the object to be measured, so that the measurable range can automatically adapt to the corresponding object to be measured.

[0081] Optionally, in other embodiments, the installation position of the load cell can be adjusted according to specific measurement requirements and structural design. For example, multiple load cells can be used and installed at multiple key positions on the bearing part 4, such as around the bearing part 4 and multiple connection points between the bearing part 4 and the balance beam assembly 3. Through data fusion of multiple sensors, more balanced and accurate measurement results can be obtained, and the anti-interference ability of the system can be improved.

[0082] In addition, an embedded load cell can also be used, integrating the load cell into the structure of the bearing part 4 to reduce the influence of external factors on the measurement accuracy and enhance the overall stability of the measurement system.

[0083] In one embodiment, the first variable counterweight module 1 and / or the second variable counterweight module 2 adopt multiple discrete counterweight weights 50, and dynamic counterweight is achieved through a weight loading mechanism 51 to adapt to measured objects with different mass ranges and improve the flexibility and accuracy of the measurement system.

[0084] Each counterweight weight 50 has a preset nominal mass value. For example, it is graded in standard mass units (such as grams, milligrams). Among them, the weight loading mechanism 51 automatically selects an appropriate number or mass combination of weights according to the control instructions issued by the collaborative control module and loads them to the corresponding end of the balance beam assembly 3. For example, standard weights such as 10g, 20g, 50g, 100g, etc. This discrete design enables the system to achieve fine control of the counterweight load through different permutations and combinations of weights of different masses. For example, when it is necessary to adjust the counterweight load of 50g, the system can choose to directly load a 50g weight or choose to load two 25g weights in sequence, making the adjustment more flexible.

[0085] Based on the settings in this embodiment, the measurement system of the present application can achieve flexible counterweight adjustment in different measurement scenarios according to the mass characteristics of the object to be measured to ensure measurement accuracy and stability. In specific implementation, the weight loading mechanism 51 has various forms. For example, mechanical, electromagnetic adsorption, etc. The mechanical loading mechanism can be set to use a robotic arm, a lever, a slide rail, etc. to achieve the loading and unloading of the counterweight weight 50.

[0086] In one embodiment, based on the above embodiment, as Figure 2 and Figure 3 shown, further, the weight loading mechanism 51 includes a bearing base 511, a power mechanism 512, and an actuator 513, and each part works together to achieve operations such as loading or unloading of the counterweight weight 50.

[0087] Specifically, there is a transfer path between the bearing base 511 and the balance beam assembly 3, so as to realize the transfer of the balancing weight 50 between the bearing base 511 and the balance beam assembly 3. In other words, the balancing weight 50 can be accurately applied to the designated end of the balance beam assembly 3. The power mechanism 512 provides driving force for the actuating element 513, and the actuating element 513 is used to grasp, move, load or unload the balancing weight 50; for example, when grasping, it can be set as a jaw structure, a magnetic attraction structure or a vacuum chuck structure.

[0088] Optionally, during the loading process of the balancing weight 50, the process is that the cooperative control module issues a loading instruction, and the power mechanism 512 drives the actuating element 513 to the preset weight storage area in the mass comparator; the actuating element 513 grasps or adsorbs the balancing weight 50 with a specified mass and moves it to the corresponding position of the bearing base 511 to complete the loading through one or multiple times. Similarly, the unloading process of the weight is also realized through the power mechanism 512 and the actuating element 513, which will not be elaborated here.

[0089] In this application, the bearing base 511 can adopt a limiting structure (such as a positioning groove, a magnetic attraction fixing point, etc.) to ensure that the balancing weight 50 remains stable after loading and will not shift due to external forces. In a specific implementation, the bearing base 511 can be designed as a multi-layer structure or a telescopic platform to adapt to different sizes and quantities of weights.

[0090] Therefore, in this application, through the cooperative action of the power mechanism 512 and the actuating element 513, precise control of the balancing weight 50 is realized, human error is reduced, and the automation degree of the measurement system is improved.

[0091] It should also be noted that in addition to setting a preset weight storage area in the mass comparator, the balancing weight 50 can also be stored and managed in other ways, specifically depending on the cooperation form of relevant structural components such as the power mechanism 512 and the actuating element 513.

[0092] For example, a disk-type rotatable weight storage disk can be adopted, and different specifications of balancing weights 50 are arranged along the circumferential direction, so as to rotate and select the appropriate weight and send it to the balance beam assembly 3 through a clamping mechanism, which can improve the picking and placing efficiency and quickly select and pick up the target weight through rotational positioning; or, the weights are stored on the top or side of the instrument through a hanging mechanism (such as magnetic attraction, a hook, a telescopic mechanism), and in this case, a motor or a robotic arm can be used to place it on the balance beam assembly 3 to save space and optimize the internal structure layout of the comparator.

[0093] In one embodiment, please refer to the attached drawings of the specification Figure 2The balance beam assembly 3 is provided with a mounting seat 30, and a plurality of stepped weight positioning grooves 5110 are arranged on the bearing base 511, and the weight positioning groove 5110 can accommodate at least one balancing weight 50; at the same time, the balancing weight 50 and the mounting seat 30 form a nesting relationship, and the bearing base 511 is cooperatively connected with the actuator 513, so that when the actuator 513 is driven, the bearing base 511 moves synchronously to realize the docking and disassembly between the balancing weight 50 and the mounting seat 30.

[0094] The weight positioning groove 5110 is arranged in a stepped manner along the height direction of the bearing base 511, so that the balancing weight 50 can be loaded at different heights, ensuring the step-by-step loading and adjustment of the weight; moreover, the balancing weight 50 and the mounting seat 30 form a sleeve relationship, which can effectively prevent the balancing weight 50 from loosening due to vibration or external force during the measurement process, ensuring the measurement stability of the system. Optionally, the depth of the weight positioning groove 5110 is adjustable to control the docking interval of different weights, making the loading process more controllable.

[0095] Specifically, referring to the accompanying drawings, it can be understood that most of the mounting seat 30 is located below the balance beam assembly 3, and can cooperate with the bearing base 511 to realize the transfer process of the balancing weight 50 from the bearing base 511 to the balance beam assembly 3; a part of it is in an inverted T-shaped cross-section to form a stable bearing structure to prevent the weight from slipping, and optionally, a docking portion is provided on the mounting seat 30, which can accurately receive the balancing weight 50 loaded from the bearing base 511, thereby ensuring the stability of the balancing weight 50.

[0096] The bearing base 511 is relatively connected to the actuator 513, so that the actuator 513 drives the bearing base 511 to move up and down, thereby realizing automatic loading or unloading of the balancing weight 50. When the actuator 513 drives the bearing base 511 to descend, the weights will dock with the mounting seat 30 in turn to realize loading; when the bearing base 511 continues to move downward, the weights will gradually completely separate from the bearing base 511, and finally be stably loaded on the mounting seat 30.

[0097] The loading process of the weights is briefly described as follows: In the initial state, the bearing base 511 is located at the upper starting position. A plurality of counterweights 50 are arranged according to the weight positioning grooves 5110 arranged in a stepped shape and do not contact the mounting base 30. The actuating element 513 and the power mechanism 512 are activated to drive the bearing base 511 to move downward in the vertical direction. Due to the stepped arrangement, the lowermost counterweight 50 will first align and dock with the docking portion on the mounting base 30. When the bearing base 511 continues to descend, the already docked weight will gradually disengage from the bearing base 511. At this time, this weight is fully loaded onto the mounting base 30, and the bearing base 511 continues to move to a new position. The unloading process is the reverse driving situation of the loading process, and it is easy to understand and deduce that it is the process of the counterweight 50 being transferred from the mounting base 30 to the bearing base 511, which will not be elaborated here.

[0098] If multiple weights need to be loaded, the depth of the weight positioning grooves 5110 can be adjusted so that they are docked step by step at different heights to ensure the orderliness of the loading process. It should also be noted that in this application, the weight loading mechanisms 51 such as the mounting base 30 and the bearing base 511 are arranged below the bearing portion 4 to avoid affecting the placement space of the object to be measured and ensure that the loading process does not interfere with the normal mass measurement.

[0099] In one embodiment, referring to the attached drawings of the specification Figure 3 , different from the specific structural design of the weight loading mechanism 51 in the above embodiment, this embodiment is another implementation manner of the weight loading mechanism 51. Among them, the weight loading mechanism 51 includes a power mechanism 512 and an actuating element 513. In the two implementation manners, the power mechanism 512 and the actuating element 513 can be of the same model and specification, or of different models and specifications. In this application, if the two models and specifications are the same, no distinction is made.

[0100] Specifically, the counterweights 50 are sequentially sleeved on the outer periphery of the actuating element 513, that is, a plurality of counterweights 50 are arranged in sequence along the length direction of the actuating element 513 and can move up and down together with the actuating element 513. Among them, the lifting of the actuating element 513 is driven by the power mechanism 512, and implementation manners such as an electric push rod and a screw lifting mechanism can be adopted. At least two protrusion parts 5131 are arranged along the length direction on the actuating element 513. One protrusion part 5131 is located at one end of the actuating element 513 away from the power mechanism 512 as a terminal limit structure to prevent the weight from accidentally falling off, and the remaining protrusion parts 5131 are respectively arranged at preset positions. Each protrusion part 5131 can receive the counterweight 50. In the natural state, the counterweight 50 is supported by this protrusion part 5131 and can move up and down synchronously with the actuating element 513.

[0101] Based on the settings in this embodiment, during the loading process of the weights, in the initial state, multiple counterweights 50 are sequentially sleeved on the outer periphery of the actuating element 513. The lowermost weight is supported by the lowermost convex portion 5131, and the remaining weights are sequentially stacked above it. Then, the power mechanism 512 starts to drive the actuating element 513 to drive the counterweights 50 to move downward. The lowermost counterweight 50 contacts the balance beam assembly 3 (or other loading target positions). At the same time, the corresponding convex portion 5131 continues to move downward and separates from the weight, enabling the weight to be successfully loaded to the target position. The remaining weights continue to be supported by the upper convex portion 5131 to ensure that they will not accidentally fall. As the actuating element 513 continues to descend, each counterweight 50 can be gradually loaded onto the balance beam assembly 3.

[0102] When it is necessary to unload the weights, the power mechanism 512 drives the actuating element 513 to move upward. The convex portion 5131 on the actuating element 513 re-comes into contact with the bottom position of the corresponding counterweight 50, gradually lifting the counterweight 50.

[0103] In addition, through the settings of this embodiment, the counterweights 50 are directly sleeved on the actuating element 513 without an additional bearing base 511, reducing the complexity of the mechanism and improving the reliability.

[0104] A mass comparator is a device commonly used for high-precision mass measurement. Its core measurement principle is based on electromagnetic force compensation technology to balance the weight of the object to be measured. However, during the measurement process, the measurable range of an electronic balance is limited by its original range. When the mass of the object to be measured is too large or too small, the electronic balance may not be able to measure accurately, or additional mechanical counterweights need to be adjusted, affecting the measurement efficiency.

[0105] In one embodiment, referring to the accompanying drawings of the specification Figure 4 , according to another aspect of the present application, the present application further provides a mass comparator. The mass comparator integrates the measurement system with the bilateral variable counterweight function in the above embodiment. Through counterweight adjustment, the mass measurement range can be effectively optimized, and high-precision measurement can be achieved by combining electromagnetic force compensation. As can be seen from the above content, the measurement system includes key components such as a first variable counterweight module 1 and a second variable counterweight module 2, which can dynamically adjust the counterweight load according to the mass of the object to be measured, so that the mass of the object to be measured falls within the measurable range of the electronic balance. Through the bilateral variable counterweight method, the system can achieve a larger measurement range, improving the measurement accuracy and stability.

[0106] Specifically, the mass comparator mainly includes the above-mentioned measurement system, the carrier part 4, the sensor, the electromagnetic force generating device 6 and the output unit. The object to be measured is placed on the carrier part 4, and the carrier part 4 is connected to the balance beam assembly 3. The balance beam assembly 3 serves as the core support structure to maintain the overall balance state. The sensor detects the tilt angle or position change of the balance beam assembly 3 and generates a displacement signal. The electromagnetic force generating device 6 generates a corresponding electromagnetic force based on this displacement signal to restore the balance of the balance beam assembly 3. Finally, the output unit calculates the actual mass of the object to be measured according to the magnitude of the electromagnetic force and outputs the measurement result.

[0107] In the actual application scenario of the mass comparator, the carrier part 4 can adopt various materials and shapes. For example, a flat tray made of stainless steel can effectively prevent item corrosion and is easy to clean, and is suitable for placing various items with regular shapes. For objects to be measured with special shapes or those that are prone to rolling, a carrier part 4 with anti-slip and limit functions can be equipped to ensure the stable position of the object to be measured during the measurement process, providing a basic guarantee for subsequent accurate measurement.

[0108] The bilateral variable counterweight measurement system can adjust the counterweight load before measurement. For example, when the original range of an electronic balance is 0 - 100 g, and the mass of the object to be measured may exceed this range, 100 g weights are respectively loaded through the bilateral variable counterweight module, and the measurement range of the system can be adjusted to 100 - 200 g, so as to ensure that the mass of the object to be measured falls within the measurable range. For further adjustment methods, reference can be made to the corresponding paragraphs in this article, which will not be elaborated here.

[0109] The electromagnetic force generating device 6 in this application includes key components such as a coil and a magnet. The coil is generally wound with a metal wire with good conductivity (such as copper wire) and has a certain number of turns. The magnet is usually made of a permanent magnetic material and can provide a stable magnetic field. When an electric current passes through the coil, the energized coil in the magnetic field will generate an electromagnetic force, and the generated electromagnetic force will drive the balance beam back to the balanced position. By controlling the magnitude of the current passing through the coil, the magnitude of the generated electromagnetic force can be controlled.

[0110] Based on the above content, it can be seen that during the measurement process, the bilateral variable counterweight measurement system can not only expand the measurement ability of the electronic balance, but also reduce the burden on the electromagnetic force generating device 6. Since the counterweight module can adjust the initial balance state of the system in advance, the electromagnetic force generating device 6 only needs to provide fine-tuning compensation within a small range, avoiding the errors caused by large-range compensation. In this way, not only the measurement accuracy is improved, but also the power consumption of the mass comparator is reduced, enabling the device to work stably for a long time.

[0111] In one embodiment, further, a windproof structure 70 is disposed around the outer periphery of the bearing portion 4, which is configured to form at least partial partitioning outside the object to be measured after the object to be measured is placed on the bearing portion 4, so as to attenuate the external air flow disturbance.

[0112] It can be understood that when an electronic balance performs high-precision measurement, it is relatively sensitive to environmental factors. In particular, external air flow may have a significant impact on the measurement result. For example, in a laboratory or industrial metrology environment, weak air flow fluctuations may be caused by air conditioners, ventilation systems, or personnel movement, which may in turn cause slight swinging of the object to be measured during the measurement process, affecting the stability of the weighing data.

[0113] In this embodiment, by disposing the windproof structure 70 around the outer periphery of the bearing portion 4, a local static air layer is formed, effectively reducing the influence of external air flow on the object to be measured. The windproof structure 70 can be made of a transparent or semi-transparent lightweight material, so as to observe the measurement process and ensure that it will not significantly increase the additional load of the bearing portion 4.

[0114] In addition, the windproof structure 70 can be designed into different forms according to actual needs. For example: a fixed windproof cover, which surrounds the bearing portion 4 as a whole, provides all-round protection, and is suitable for a high-precision laboratory measurement environment; or, an adjustable windproof cover, which adopts a design of lift adjustment or rotation adjustment, and the user can adjust the height or opening angle of the windproof cover according to the measurement environment to adapt to objects to be measured of different specifications; or, a partially open windproof cover, which has a partial opening in a specific direction, ensures the operation convenience during measurement, and provides the necessary windproof effect.

[0115] In one embodiment, referring to the accompanying drawings of the specification Figure 5 , according to another aspect of the present application, the present application further provides a measurement method, based on the above-mentioned mass comparator, including the steps:

[0116] Step S1: Obtain the weight of the object to be measured through the load detection module.

[0117] Step S2: Determine whether the weight exceeds the current range threshold of the mass comparator.

[0118] Step S3: If it exceeds the threshold range or does not reach the threshold range, generate a counterweight adjustment instruction to drive the first variable counterweight module and the second variable counterweight module to adjust the counterweight load.

[0119] Step S4: After the balance beam assembly returns to the balanced state, calculate the actual weight value of the object to be measured based on the electromagnetic force generated by the electromagnetic force generating device.

[0120] It can be understood that in step S2, after receiving the weight signal, the collaborative control module compares it with the current range threshold of the mass comparator to determine whether the weight of the object to be measured is within the current range. If the weight is within the range, it enters the electromagnetic force compensation measurement stage; if the weight exceeds the upper limit of the range or is lower than the lower limit of the range, the balancing load needs to be adjusted to bring the measurement system back to the measurable range.

[0121] In step S3, reference can be made to the relevant paragraphs of the balancing adjustment instruction in the above text. For example, if the weight of the object to be measured is too large and exceeds the upper limit of the range, the collaborative control module will instruct the first variable balancing module and the second variable balancing module to increase the balancing load to expand the range upward; if the weight of the object to be measured is too small and does not reach the lower limit of the range, the collaborative control module will instruct to reduce the balancing load.

[0122] According to step S4, the electromagnetic force generating device automatically adjusts the electromagnetic force applied to the balance beam assembly according to the signal of the displacement sensor to keep the system in stable balance. Finally, the mass comparator calculates and outputs the actual weight value of the object to be measured based on the electromagnetic force generated by the electromagnetic force generating device to complete accurate measurement.

[0123] Through the settings of this application, the high-precision and wide-range measurement functions of the mass comparator can be guaranteed, making the mass comparator very suitable for various application scenarios such as laboratory precision weighing and industrial metrology.

[0124] It should be noted that the above embodiments can be freely combined as needed. The above is only the preferred embodiment of this application. It should be pointed out that for those of ordinary skill in the art, without departing from the principle of this application, several improvements and refinements can still be made, and these improvements and refinements should also be regarded as the protection scope of this application.

Claims

1. A measurement system, characterized in that: For use with mass comparators, including: A balance beam assembly, having a first end and a second end arranged opposite to each other, wherein the first end is connected to a bearing portion in the mass comparator for bearing the object to be measured, and the second end corresponds to a reference load end of the mass comparator; A load detection module, used for detecting the weight of the object on the load-bearing part in real time and outputting a detection signal; A first variable balancing module, disposed at the first end, capable of dynamically adjusting a first balancing load applied to the first end; A second variable balancing module, disposed at the second end, capable of dynamically adjusting a second balancing load applied to the second end; A collaborative control module is respectively connected to the load detection module, the first variable balancing module and the second variable balancing module. The collaborative control module is used to generate a control signal based on the detection signal to adjust the first balancing load and the second balancing load, and then adjust the measurable range of the mass comparator so that the weight of the object to be measured can fall within the measurable range.

2. The measuring system according to claim 1, characterized in that The load detection module comprises: A weighing sensor is arranged at the connection between the load-bearing part and the balance beam assembly, and is used to measure the actual weight of the object to be measured; A signal processing unit is connected to the weighing sensor and is used to convert the actual weight into a digital weight signal and transmit the digital weight signal to the collaborative control module.

3. The measuring system according to claim 1, characterized in that The first variable balancing module and / or the second variable balancing module comprises: a plurality of discrete taring weights, each of said taring weights having a preset nominal mass value; The weight loading mechanism is used to load a specific number or combination of the balancing weights to the corresponding ends of the balance beam assembly according to the control instruction.

4. The measuring system according to claim 3, characterized in that The weight loading mechanism comprises a bearing base, a power mechanism and an actuator; the power mechanism and the actuator are cooperatively connected, the power mechanism can drive the actuator to move, and the actuator is used to move or load or unload the balancing weight; A transmission path is provided between the bearing base and the balance beam assembly to realize the transmission of the balancing weight between the bearing base and the balance beam assembly.

5. The measuring system according to claim 4, characterized in that The balance beam assembly is provided with a mounting seat, the bearing base is provided with a plurality of weight positioning grooves, the weight positioning grooves are arranged in a stepped manner along the height direction of the bearing base, each of the weight positioning grooves can accommodate at least one balancing weight, the balancing weight and the mounting seat form a sleeve, and the bearing base is cooperatively connected with the actuator; When the actuator is driven, the bearing base moves synchronously, so that the balancing weight in the bearing base can be correspondingly docked to the mounting seat to complete loading, or separated from the mounting seat to complete unloading.

6. The measuring system according to claim 3, characterized in that The weight loading mechanism includes a power mechanism and an actuator; The balancing weights are sequentially sleeved on the outer periphery of the actuator, the power mechanism can drive the actuator to drive the balancing weights to move up and down, and at least two protrusions arranged along the length direction are arranged on the actuator; One of the protrusions is located at the end of the actuator away from the power mechanism, and is used to prevent the balancing weight from falling off the actuator. Each of the protrusions can receive the corresponding balancing weight. In the first state, the protrusion and the balancing weight are in contact with each other, so that the balancing weight can be raised and lowered synchronously when the actuator moves. In the second state, the protrusion and the balancing weight are separated, so that the corresponding balancing weight can abut against the balance beam assembly to complete load loading.

7. The measuring system according to any one of claims 1 to 6, characterized in that: The collaborative control module is configured to determine whether the current weight of the object to be measured exceeds the measurable range according to the detection signal; If the weight of the object exceeds the measurable range, a balancing adjustment instruction is generated to control the first variable balancing module and the second variable balancing module to synchronously adjust the corresponding balancing loads so that the weight of the object to be measured is adapted to the measurable range; The taring adjustment instruction includes: When the weight of the object to be measured exceeds the upper limit of the measurable range, the first variable balancing module and the second variable balancing module are controlled to synchronously increase the corresponding balancing load; or, the first variable balancing module is controlled to reduce the balancing load and the second variable balancing module is controlled to increase the balancing load; When the weight of the object to be measured is lower than the lower limit of the measurable range, the first variable balancing module and the second variable balancing module are controlled to synchronously reduce the corresponding balancing loads; or, the first variable balancing module is controlled to increase the balancing load and the second variable balancing module is controlled to reduce the balancing load.

8. A mass comparator, characterized in that: include: A measuring system as claimed in any one of claims 1 to 7; A bearing part, used for bearing the object to be tested; A sensor for detecting a tilt angle or position change of the balance beam assembly and generating a corresponding displacement signal; an electromagnetic force generating device, acting on the balance beam assembly, and configured to generate an electromagnetic force based on the displacement signal, so as to adjust the balance state of the balance beam assembly by the electromagnetic force; The output unit is used to calculate and obtain the actual weight of the object to be measured based on the electromagnetic force.

9. The mass comparator according to claim 8, characterized in that: A windproof structure is disposed around the outer periphery of the bearing portion, and is used to form at least a partial barrier outside the object to be tested after the object to be tested is placed on the bearing portion, so as to attenuate external airflow disturbance.

10. A measurement method, characterized in that: The mass comparator according to any one of claims 8 to 9 comprises the steps of: Obtaining the weight of the object to be measured by the load detection module; Determining whether the weight exceeds a current range threshold of the mass comparator; If the threshold value is exceeded or not reached, a balancing adjustment instruction is generated to drive the first variable balancing module and the second variable balancing module to adjust the balancing load; After the balance beam assembly recovers to a balanced state, the actual weight value of the object to be measured is calculated based on the electromagnetic force generated by the electromagnetic force generating device.

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