Balancing system, mass comparator and measuring method

Abstract

The invention relates to the technical field of mass measurement, and discloses a balance system, a mass comparator and a measurement method, the balance system is suitable for the mass comparator, the mass comparator comprises a balance beam structure, the balance beam structure is provided with a first end and a second end which are oppositely arranged, the first end is connected with a scale pan and used for bearing an object to be measured, and the second end is connected with the balance beam structure. The second end is connected with the reference load part. The balance system comprises a first balance part and a second balance part, the first balance part is arranged at the first end of the balance beam structure, the second balance part is arranged at the second end of the balance beam structure, the first balance part and the second balance part work cooperatively, and the measuring range of the mass comparator can be expanded by applying or removing loads to the two ends of the balance beam structure at the same time. The mass comparator can also adopt the balance system, so that the measurable range is expanded, the measurement precision is kept, and the mass comparator can be applied to wider scenes.

Description

Technical Field

[0001] This application relates to the field of mass measurement technology, and further relates to a counterweight 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 adopting 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, relying on the sensor to detect the position change of the balance beam, and then generating an electromagnetic force balanced with 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 the electromagnetic force, the mass of the object to be measured can be determined.

[0003] However, in actual use of the existing mass comparator, its measurement range and accuracy are often limited by the characteristics of the sensor itself. For example, when the mass of the object to be measured is relatively large, in order to expand the measurement range, the sensor is required 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 counterweight system, a mass comparator and a measurement method, which can effectively improve the adaptability of the device to different ranges without affecting the measurement accuracy through the coordinated adjustment of the counterweight parts at both ends of the balance beam.

[0005] To achieve the above purpose, this application provides a counterweight system, which is arranged in a mass comparator. The mass comparator has a balance beam structure, and the balance beam structure has a first end and a second end arranged oppositely. The first end is connected to the weighing pan of the mass comparator, and the second end is connected to the reference load part of the mass comparator. The counterweight system includes:

[0006] A first counterweight part, arranged at the first end of the balance beam structure, capable of selectively applying or removing a load to the first end;

[0007] A second counterweight part, arranged at the second end of the balance beam structure, capable of selectively applying or removing a load to the second end;

[0008] Wherein, the first counterweight part and the second counterweight part can work together to expand the measurement range of the mass comparator by simultaneously applying or removing loads to both ends of the balance beam structure.

[0009] In some embodiments, the counterweight system further includes a counterweight adjustment module. The first counterweight portion and the second counterweight portion are both solid counterweight modules. The counterweight adjustment module is respectively connected to the first counterweight portion and the second counterweight portion in a cooperative manner, and is used to control the loading or unloading of the first counterweight portion and the second counterweight portion.

[0010] In some embodiments, the number of the counterweight adjustment modules is at least two;

[0011] Among them, some of the counterweight adjustment modules are arranged at the first end of the balance beam structure and cooperate with the first counterweight portion to adjust and control the loading and unloading of the first counterweight portion; the remaining counterweight adjustment modules are arranged at the second end of the balance beam structure and cooperate with the second counterweight portion to adjust and control the loading and unloading of the second counterweight portion.

[0012] In some embodiments, each of the counterweight adjustment modules includes a driving device and a control unit. The driving device is used to implement the loading or unloading operation of the first counterweight portion or the second counterweight portion relative to the balance beam structure, and the control unit is used to control the action of the driving device.

[0013] In some embodiments, the driving device includes a translation mechanism; a first beam docking end and a second beam docking end are respectively provided at both ends of the balance beam structure. The first counterweight portion is provided with a first counterweight docking end, and the second counterweight portion is provided with a second counterweight docking end;

[0014] Among them, under the drive of the corresponding translation mechanism, the first counterweight portion moves so that the first counterweight docking end and the first beam docking end can be docked or separated from each other, for the loading or unloading of the first counterweight portion;

[0015] Under the drive of the corresponding translation mechanism, the second counterweight portion moves so that the second counterweight docking end and the second beam docking end can be docked or separated from each other, for the loading or unloading of the second counterweight portion.

[0016] In some embodiments, the driving device includes any one or a combination of several of an electric driving device, a mechanical driving device, a hydraulic driving device, a pneumatic driving device, and an electromagnetic driving device.

[0017] In some embodiments, the counterweight system further includes a guiding structure. The guiding structure is arranged on the loading and unloading path of the first counterweight portion and / or the loading and unloading path of the second counterweight portion, and is used to prevent the first counterweight portion and / or the second counterweight portion from generating offset or misalignment during docking.

[0018] On the other hand, the present application also provides a mass comparator, comprising:

[0019] A balance beam structure;

[0020] A weighing pan, connected to the first end of the balance beam structure, for carrying an object to be measured;

[0021] A sensor, for detecting the displacement or tilt angle of the balance beam structure and generating a corresponding signal;

[0022] An electromagnetic force generating device, acting on the second end of the balance beam structure, configured to generate an electromagnetic force according to the signal to keep the balance beam structure in a preset balanced position;

[0023] The above-mentioned counterweight system, at least part of which is disposed on the balance beam structure, and the first counterweight portion and the second counterweight portion can apply or remove a load on the balance beam structure;

[0024] A control module, for receiving the signal and adjusting the working state of the counterweight system according to the signal, and / or adjusting the magnitude of the electromagnetic force;

[0025] A display module, for displaying the measurement result.

[0026] On the other hand, the present application also provides a measurement method, based on the above-mentioned mass comparator, which includes the steps of: controlling the counterweight system to apply or remove a counterweight load at both ends of the balance beam structure, and placing an object to be measured on the weighing pan;

[0027] Based on the displacement signal detected by the sensor, adjusting the output current of the electromagnetic force generating device and applying an electromagnetic force to keep the balance beam structure in a preset balanced position;

[0028] Calculating the weight of the object to be measured based on the applied output current value.

[0029] In some embodiments, in the step of controlling the counterweight system to apply or remove a counterweight load at both ends of the balance beam structure, by adjusting the weight of the counterweight load to expand the measurement range of the mass comparator, the specific situations are as follows:

[0030] The first situation is that when counterweight loads are applied at both ends of the balance beam structure, controlling the counterweight loads at both ends to increase monotonically, the upper limit of the measurement range is increased, so that the mass comparator is applicable to measuring objects with large masses;

[0031] The second situation is that when counterweight loads are applied at both ends of the balance beam structure, controlling the counterweight loads at both ends to decrease monotonically, the lower limit of the measurement range is decreased, so that the mass comparator is applicable to measuring objects with small masses;

[0032] In the third case, the loads at both ends of the balance beam structure are removed, and the measurement range is consistent with the original range of the mass comparator;

[0033] In the fourth case, when counterweight loads are applied to both ends of the balance beam structure, control the counterweight load at the first end of the balance beam structure to decrease monotonically, and control the counterweight load at the second end of the balance beam structure to increase monotonically;

[0034] In the fifth case, when counterweight loads are applied to both ends of the balance beam structure, control the counterweight load at the first end of the balance beam structure to increase monotonically, and control the counterweight load at the second end of the balance beam structure to decrease monotonically.

[0035] Compared with the prior art, the counterweight system, mass comparator, and measurement method provided by the present application have the following beneficial effects:

[0036] 1. Through the design of the present application, by loading the first counterweight part and the second counterweight part at both ends of the balance beam structure respectively, high-precision (determined by the sensor accuracy) and wide-range measurement are achieved. During the measurement process, according to the mass of the object to be measured, the loads of the counterweight parts at both ends are adjusted so that the balance beam can maintain an accurate balance state under different measurement conditions. Since the sensor accuracy determines the measurement accuracy, and the loadable and unloadable counterweight form of the counterweight system expands the upper and lower limits of the measurement range, this ensures that the measurement accuracy can be maintained at the high-precision level that the sensor can achieve throughout the wide range.

[0037] 2. Through the design of the present application, when it is necessary to measure an object with a large mass, appropriate counterweight weights can be added to both ends of the balance beam so that the mass comparator can withstand a greater load, thereby expanding the measurement range upward; conversely, when measuring an object with a small mass, reduce the counterweight weights at both ends or do not load the counterweight to reduce the overall load of the system and achieve downward expansion of the measurement range, enabling the mass comparator to play a role in different measurement scenarios and greatly improving its applicability. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] The following will further illustrate the above-mentioned characteristics, technical features, advantages, and their implementation manners of the present application in a clear and understandable manner in combination with the drawings in the preferred embodiments.

[0039] Figure 1 is a schematic diagram of the relevant structure of the counterweight system in an embodiment of the present application;

[0040] Figure 2 is a partial structure schematic diagram of the counterweight system at the scale pan position in an embodiment of the present application;

[0041] Figure 3 is a partial structure schematic diagram of the counterweight system at the reference load part position in an embodiment of the present application;

[0042] Figure 4 It is a schematic structural diagram of a mass comparator in an embodiment of the present application;

[0043] Figure 5 It is a flowchart of a method for measurement using a mass comparator in an embodiment of the present application.

[0044] Explanation of the reference numerals in the drawings: The first counterweight part 1; the first counterweight 11; the second counterweight part 2; the second counterweight 21; the balance beam structure 3; the first end 31; the second end 32; the weighing pan 4; the counterweight adjustment module 5; the driving device 51; the lifting rod 511; the convex part 512; the electromagnetic force generating device 6; the display module 7. Detailed implementation manners

[0045] 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 based on these drawings, and other implementation manners can also be obtained.

[0046] For the sake of simplicity of the drawings, 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, for the sake of simplicity and easy understanding of the drawings, in some drawings, for the components with the same structure or function, only one of them is schematically shown, or only one of them is marked. In this document, "one" not only means "only this one", but also means the situation of "more than one".

[0047] It should be further understood that the term "and / or" used in the specification and the appended claims of the present application refers to any combination and all possible combinations of one or more of the related listed items, and includes these combinations.

[0048] In this document, it should be noted that, unless otherwise clearly specified and defined, the terms "installed", "connected", and "connected" 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 directly connected or indirectly connected 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 the present application can be understood according to specific situations.

[0049] In the description of the present 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 the present 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, and therefore should not be construed as a limitation to the present application.

[0050] In addition, in the description of the present application, the terms "first", "second", etc. are only used for distinguishing descriptions and should not be construed as indicating or implying relative importance.

[0051] In the field of mass measurement, as the core device for high-precision mass measurement, the performance of a mass comparator is crucial for the production and scientific research work of 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 mass comparators to simultaneously achieve a wide measurement range and high measurement accuracy.

[0052] 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. The sensor captures this displacement change, and the electromagnetic force generating device generates a corresponding electromagnetic force to offset 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, to a certain extent, the measurement range and accuracy of the mass comparator depend on the measurement range and accuracy of the sensor, and the measurement range and accuracy of the sensor restrict each other. When trying to expand the measurement range, due to the limitations of its own characteristics, the sensor 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 of different weight ranges.

[0053] 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 heating, 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.

[0054] Based on the above problems, in one embodiment, the counterweight system provided by the present application can adjust the mass distribution on both sides by selectively loading or unloading counterweights with a preset mass at both ends of the balance beam, so as to cover a wider measurement range with a small number of weights.

[0055] Please refer to the attached Figure 1 , a balancing system provided by the present application, which is applicable to a mass comparator. By respectively arranging a first balancing part 1 and a second balancing part 2 at both ends of the balance beam structure 3, bilateral balancing is achieved, thereby effectively expanding the measurement range of the mass comparator.

[0056] It should be noted that the mass comparator includes a balance beam structure 3, which has a first end 31 and a second end 32 arranged oppositely. Among them, the first end 31 is connected to the weighing pan 4 of the mass comparator, and the second end 32 is connected to the reference load part of the mass comparator.

[0057] To achieve bilateral balancing, the balancing system includes at least two balancing parts, which are distinguished as a first balancing part 1 and a second balancing part 2. The first balancing part 1 is arranged at the first end 31 of the balance beam structure 3, and the second balancing part 2 is arranged at the second end 32 of the balance beam structure 3, and both can apply loads or remove loads to both ends of the balance beam structure 3 to achieve the purpose of expanding the measurement range of the comparator.

[0058] It should be noted that 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.

[0059] The core implementation method in the present application is to preferentially use physical load adjustment. By loading or unloading balancing weights at the measured end and the reference end, the R & D and production costs can be reduced, and components such as drive circuits and heat dissipation modules in the related design of virtual loads can be omitted, ensuring the thermal stability of the equipment. Therefore, in the following text, the method of loading or unloading loads on the balance beam structure 3 is used to describe this solution. However, in fact, both physical loads and virtual loads can achieve the technical effects in the present application.

[0060] Furthermore, in this embodiment, the first balancing part 1 and the second balancing part 2 can work together, that is, dynamically adjust the load states of the balancing parts at both ends according to the measurement requirements, so as to optimize the force distribution of the balance beam and enable the mass comparator to adapt to a larger range of measurement objects. For example, when measuring high-quality objects, the balancing parts can be loaded at both the first end 31 and the second end 32 at the same time to provide additional balancing loads, thereby ensuring the balance of the balance beam structure 3 and avoiding the load imbalance problem that may be caused by traditional single-sided balancing. In addition, when measuring small-quality objects, the measurement range can be adjusted to a lower measurement range by unloading the balancing parts, thereby improving the adaptability of the mass comparator.

[0061] For example, when measuring a larger mass object, the load on one end of the scale pan 4 increases. If the traditional single-sided balancing method is still used, the reference load part may require a very large amount of weights, or require extremely strong electromagnetic force compensation, which will complicate the structure of the device and even exceed the standard load capacity. In this solution, by loading the balancing part at one end of the scale pan 4 (the first end 31) and the standard weight end (the second end 32) at the same time, the additional load can be evenly distributed. When the balancing parts at the first end 31 and the second end 32 work together, it is equivalent to improving the "reference load capacity" of the mass comparator, that is, increasing the maximum measurement range of the mass comparator. In this mode, even if the mass of the object to be measured is large, it can ensure that the measurement system is in a suitable balance range, avoiding the increase of measurement errors or the failure of the instrument to work properly due to measurement exceeding the set range.

[0062] Similarly, when measuring a smaller mass object, this solution restores the balance beam structure 3 to a light-load state by unloading the first balancing part 1 and the second balancing part 2, and restores the measurement range to a small mass range, thereby achieving a downward expansion of the measurement range. Of course, in some embodiments, the weight of the first balancing part 1 and the second balancing part 2 can also be adjusted to achieve further optimization and adjustment of the measurement range.

[0063] In a mass comparator, the accuracy of the sensor and the measuring range can be said to be mutually constrained. The accuracy of the sensor refers to the degree of closeness between the measured value and the true value within the specified measuring range. From a theoretical point of view, the larger the measuring range, the more difficult it is to ensure high accuracy throughout the entire range, because within a large measuring range, the sensor will be more affected by various interference factors, such as temperature changes, mechanical vibrations, etc. These factors may cause the measurement error to increase, thereby affecting the accuracy, so that if the mass comparator wants to achieve a wide range, it may have to sacrifice accuracy.

[0064] It should be emphasized that in this solution, not only a wide range is achieved, but also high precision can be achieved at the same time. When measuring large masses, the measurement range is expanded by loading the balancing load, which is not limited by the small range of high-precision sensors; when measuring small masses, the system enters the light load mode by unloading the balancing load, giving full play to the advantages of high-precision sensors and improving sensitivity and stability; during the entire measurement process, the sensor is ensured to work in the optimal range, reducing measurement errors, and achieving the measurement goals of both high precision and wide range.

[0065] In terms of specific implementation, when both the first counterweight unit 1 and the second counterweight unit 2 are physical counterweight modules, the loading or unloading of the first counterweight unit 1 and the second counterweight unit 2 can adopt various forms. For example, they can be fixed to the balance beam structure 3 by mechanical buckles or electromagnetic adsorption methods to achieve convenient loading and unloading; or, an electric motor drive or an electromagnetic control device can be used to automatically adjust the load state of the counterweight unit according to the measurement requirements before measurement; or, the loading condition of the counterweight unit can be manually adjusted through a screw structure or a slide rail structure to adapt to different measurement requirements.

[0066] Meanwhile, it can be understood that when using a mass comparator for measurement, the balance accuracy of the balance beam structure 3 is crucial. If bilateral counterweight is not used and only unilateral counterweight is done, that is, standard weights are loaded at one end of the balance beam structure 3 and the object to be measured is placed at the other end, there are many drawbacks. Since weights are only loaded unilaterally, in order to match objects to be measured with different masses, it is necessary to frequently replace a large number of weights with different specifications.

[0067] Moreover, if the unilateral counterweight method is used to achieve wide-range measurement, it is necessary to reserve a large number of weights with different masses. This not only greatly increases the equipment cost, but also makes the equipment bulky and takes up too much space. At the same time, when measuring an object with a large span of mass range, since it can only be adjusted by adding or subtracting weights unilaterally, the operation process is extremely complex, consuming a lot of time and greatly reducing the measurement efficiency.

[0068] In addition, unilateral counterweight makes the force on the balance beam more concentrated. During the measurement process, minor disturbances in the external environment, such as slight vibrations and air flow changes, are likely to have a greater impact on the balance state of the balance beam, resulting in large fluctuations in the measurement results and making it difficult to ensure the stability and reliability of the measurement.

[0069] In summary, through bilateral counterweight on both sides of the balance beam structure 3, the present application has achieved remarkable improvements in many aspects such as the reliability and lifespan of the mass comparator, showing obvious and outstanding progress.

[0070] In one embodiment, as Figure 2 and Figure 3 shown, the first counterweight unit 1 includes at least one movable or detachable first counterweight 11 to adjust the weight distribution at the first end 31 of the balance beam structure 3. Similarly, the second counterweight unit 2 includes at least one movable or detachable second counterweight 21 to adjust the weight distribution at the second end 32 of the balance beam structure 3. Thus, by loading different numbers or masses of counterweights at both ends of the balance beam, the balance state of the system can be flexibly adjusted, enabling the mass comparator to adapt to the requirements of different measurement ranges.

[0071] Moreover, in practical applications, the balancing weights can be moved or removed one by one or as needed, enabling precise control of the weights at both ends of the balance beam structure 3. In cases where high measurement accuracy is required, the operator can fine-tune the number of balancing weights to bring the balance beam structure 3 into an accurate balanced state, thereby improving the measurement accuracy. For example, when measuring the mass of a tiny sample in a scientific research experiment, by precisely increasing or decreasing the balancing weights, measurement errors can be effectively reduced, ensuring the accuracy of the measurement results.

[0072] For the movable balancing weights, guide rails can be provided on the balance beam structure 3, and the weights are connected to the guide rails through sliders to achieve smooth movement of the weights on the balance beam structure 3. For the detachable balancing weights, a slot-type or magnetic adsorption-type installation method can be adopted. The slot-type installation is achieved by snapping the weights into the slots on the balance beam structure 3 for fixation; the magnetic adsorption-type installation utilizes the attraction of magnetic materials to adsorb the weights on the balance beam structure 3, facilitating loading and unloading.

[0073] Based on the above embodiments, it should be noted that the balancing system further includes a balancing adjustment module 5, which is respectively connected and cooperated with the first balancing part 1 and the second balancing part 2 to achieve the loading or unloading operation of the balancing parts.

[0074] Generally, the balancing adjustment module 5 is connected to a controller or a processor, so as to be able to control the loading or unloading operations of the first balancing part 1 and the second balancing part 2 according to the measurement requirements of the mass comparator. For example, according to the mass of the object to be measured, the number and position of the balancing weights to be increased or decreased can be quickly calculated, so as to accurately adjust the loads at both ends of the balance beam; or, the operator inputs the approximate mass range of the object to be measured at the corresponding position of the device, and the balancing adjustment module 5 will automatically complete the loading adjustment process of the first balancing part 1 and the second balancing part 2.

[0075] Optionally, the balancing system includes a guiding structure, which can effectively prevent the balancing weights from shifting or misaligning during the loading or unloading process, thereby improving the docking accuracy and enhancing the measurement stability. Specifically, the guiding structure is arranged on the loading and unloading paths of the first balancing part 1 and / or the loading and unloading paths of the second balancing part 2 to prevent the first balancing part 1 and / or the second balancing part 2 from shifting or misaligning during docking.

[0076] Among them, the guiding structure can adopt at least one of the following forms: the form of a guide rail, which is arranged along the movement direction of the balancing part to ensure that the balancing part moves within a limited path; the form of a limiting block, which forms local limitation around the docking area to prevent lateral or rotational offset during loading; or, guiding holes are provided on the balancing part, and guiding rods are provided on the balance beam structure 3, and the balancing part moves along the guiding rods for precise docking.

[0077] In one embodiment, the number of the counterweight adjustment modules 5 is at least two. Some of them are arranged at the first end 31 of the balance beam structure 3 and cooperate with the first counterweight 1 to be responsible for adjusting and controlling the loading and unloading of the first counterweight 1. The rest are arranged at the second end 32 of the balance beam structure 3 and cooperate with the second counterweight 2 to be responsible for adjusting and controlling the loading and unloading of the second counterweight 2.

[0078] The counterweight adjustment module 5 can adopt various methods such as mechanical drive, electromagnetic adsorption, pneumatic clamping or intelligent actuators to achieve precise loading and unloading of the counterweight. For example, during implementation, the rapid replacement of the counterweight can be completed through an electric push rod, a rotating mechanism driven by a stepping motor or a magnetic adsorption device to adapt to different measurement requirements.

[0079] Through the counterweight adjustment module 5, the counterweight system can dynamically adjust the configuration of the counterweight according to different measurement modes, realize the expansion of the measurement range, and maintain high-precision measurement at the same time. For example, when measuring an object with a large mass, the counterweights of the first counterweight 1 and the second counterweight 2 can be synchronously increased at both ends of the balance beam, so that the system already has a high balance ability in the initial state, thus supporting the measurement of a larger mass range.

[0080] At the same time, the counterweight system can be combined with an automation program and a system control unit to improve the practicability. When measuring an object with a large mass, the system can automatically detect the measurement range and increase the counterweight through the actuator to ensure that the measured value is within the optimal working range of the sensor; when measuring an object with a small mass, the system can automatically unload the counterweight to reduce the initial load of the system, so that the minimum measurable mass can be very small.

[0081] In some embodiments, an intelligent control module can also be added to enable the counterweight adjustment module 5 to dynamically adjust the state of the counterweight according to real-time measurement data. For example, the counterweight adjustment module 5 can combine the sensor feedback signal, calculate whether the mass of the currently measured object is within the optimal working range of the sensor, and intelligently adjust the loading state of the counterweight to ensure the measurement accuracy.

[0082] Based on the above embodiments, further, as Figure 3 shown, each of the counterweight adjustment modules 5 includes a driving device 51 and a control unit to achieve precise loading and unloading of the first counterweight 1 and the second counterweight 2.

[0083] Specifically, the driving device 51 is used to perform the loading or unloading operation of the counterweight, enabling the first counterweight part 1 or the second counterweight part 2 to be combined with the balance beam structure 3 when needed, or removing the counterweight when not needed. The control unit is used to control the action of the driving device 51 to ensure that the loading or unloading operation is accurately executed according to the set measurement requirements. Among them, the control unit can adjust the state of the counterweight by receiving measurement signals, sensor feedback, or external control instructions to make the system adapt to different measurement modes.

[0084] In some embodiments, several measurement modes can be preset in the control unit, such as large mass measurement, small mass measurement, etc. The user can directly select the appropriate mode to make the system automatically equip the counterweight; it can also combine sensor signals, such as mass sensors, to calculate in real time whether the measurement range is suitable for the current load and automatically adjust the counterweight state.

[0085] The driving device 51 can be selected from any one or a combination of an electric driving device, a mechanical driving device, a hydraulic driving device, a pneumatic driving device, and an electromagnetic driving device. For example, a stepper motor, a servo motor, or a linear motor is used, combined with a gear, a lead screw, or a cam mechanism to achieve precise movement and loading of the counterweight; or, an electromagnet is used to control the adsorption and release of the counterweight, enabling the counterweight to quickly reach the position.

[0086] In one embodiment, the driving device 51 includes a translation mechanism. At both ends of the balance beam structure 3, a first beam docking end and a second beam docking end are respectively provided for docking or disengaging with the corresponding counterweight part. Among them, the first counterweight part 1 is provided with a first counterweight docking end for connecting with the first beam docking end; the second counterweight part 2 is provided with a second counterweight docking end for connecting with the second beam docking end.

[0087] The translation mechanism drives the first counterweight part 1 or the second counterweight part 2 to move, enabling their corresponding docking ends to dock with or disengage from the ends of the balance beam structure 3, thereby completing the loading or unloading of the counterweight part.

[0088] Among them, the first counterweight docking end and the second counterweight docking end respectively correspond to the first beam docking end and the second beam docking end. Generally, optionally, the counterweight docking end is designed as a plug or a convex structure, and the corresponding slots or holes are provided on the beam docking end. The counterweight part can be fixed by plugging and ensure stable connection through gravity or a locking mechanism; or, the counterweight docking end and the beam docking end can be integrated with magnetic components and fixed by magnetic adsorption. When it is necessary to remove the counterweight part, the adsorption force can be released through electromagnetic control.

[0089] It should be noted that the translation mechanism mainly includes two forms. One is the vertical lifting drive, and the other is the horizontal loading drive. The former is applicable to the situation where it is necessary to directly load or unload the counterweight on the gravity direction. In this way, the translation mechanism usually includes a lifting guide rail, a linear slider, a cylinder or a lead screw drive assembly, which can lift or lower the counterweight part in the vertical direction to connect or separate it from the end of the balance beam structure 3. Through the vertical lifting operation, the lateral impact during the contact process of the counterweight part can be avoided, the loading stability can be improved, and the influence on the measurement accuracy can be reduced. The latter is applicable to the equipment that needs to horizontally insert the counterweight. In this scheme, the translation mechanism adopts a linear module, a guide rail slider or a rack and pinion mechanism to push the counterweight horizontally to make it enter or leave the working position.

[0090] It should be noted that the vertical lifting method can ensure the minimum docking error during each loading and improve the stability of the measurement system. Reference can be made to the attached Figure 3 , using the lifting rod 511 (or a similar rod-shaped element) as the execution component of the driving device 51 and combining with the socket structure of the counterweight to ensure that the counterweight can be automatically loaded or unloaded smoothly.

[0091] On the side of the reference load part, the load can be applied from above or below. As shown in the figure, a protruding part 512 is provided at the bottom of the lifting rod 511, and this protruding part 512 can abut against the inner wall or the supporting surface of the corresponding counterweight, so that it moves with the movement of the lifting rod 511.

[0092] The loading process of the counterweight can be summarized as follows: In the initial state, the counterweight is sleeved on the lifting rod 511 but not docked with the balance beam structure 3; subsequently, the driving device 51 is started, and the lifting rod 511 moves downward, so that the protruding part 512 drives the counterweight to descend synchronously; during the descent, the lifting rod 511 passes through the hole position on the balance beam structure 3, and the counterweight is docked to the designated position of the balance beam structure 3 under the action of gravity to complete the loading; furthermore, the lifting rod 511 continues to descend to a suitable position until it completely disengages from the counterweight to ensure the stable loading of the weight.

[0093] It should be noted that for the setting on the side of the weighing pan 4, since the weighing pan 4 is usually located above the balance beam structure 3, it is impossible to load the counterweight from above. At this time, the loading method from below should be adopted to ensure that the loading of the counterweight can be successfully completed even if the space above is limited.

[0094] In one embodiment, according to another aspect of the present application, reference can be made to the attached Figure 1 and Figure 4, this application further provides a mass comparator. It should be noted first that a mass comparator is a high-precision measuring device widely used in the fields of scientific research, metrological testing, and industrial quality control. As known from the above, traditional mass comparators mainly calculate mass relying on the electromagnetic force compensation technology of the electromagnetic force generating device 6. However, due to the limited linear range of electromagnetic force compensation, the measuring range of the comparator is usually small, making it difficult to balance high precision and a large measuring range; for example, when measuring an object with a large mass, the system requires strong electromagnetic force compensation, which may lead to a slow response speed and affect the measurement efficiency.

[0095] To solve the above problems, this mass comparator proposed in this application includes a balance beam structure 3, a weighing pan 4, a sensor, an electromagnetic force generating device 6, the counterweight system mentioned above, a control module, and a display module 7. By integrating the counterweight system, the counterweight can be dynamically adjusted during the measurement process, enabling the comparator to maintain high precision within a wider measurement range and improving the dynamic response speed at the same time.

[0096] Specifically, the balance beam structure 3 is used to ensure the overall balance state of the balance. The weighing pan 4 is connected to the first end 31 of the balance beam structure 3 and is used to carry the object to be measured. The sensor can detect the displacement or tilt angle of the balance beam structure 3 and generate corresponding signals. The electromagnetic force generating device 6 acts on the second end 32 of the balance beam and can generate electromagnetic force according to the signals so that the balance beam structure remains at a preset balance position.

[0097] At least some components in the counterweight system are arranged on the balance beam structure 3, and the first counterweight part 1 and the second counterweight part 2 can apply or remove loads on the balance beam structure 3.

[0098] In addition, the mass comparator further includes a control module and a display module 7. The control module is used to receive the signals from the sensor and adjust the working state of the counterweight system according to the signals, and can also be used to adjust the working state of the electromagnetic force generating device 6; the display module 7 is used to display the measurement results.

[0099] In this solution, the measurement range is extended through the counterweight system. When measuring a large mass, appropriately applying the load of the counterweight part can not only reduce the burden on the electromagnetic force generating device 6 but also enable the mass comparator to maintain high-precision measurement within a wider measurement range.

[0100] In one embodiment, according to another aspect of this application, based on the above mass comparator, this application further provides a measurement method, as Figure 5 shown, including the steps:

[0101] Step S1, control the counterweight system to apply or remove counterweight loads at both ends of the balance beam structure and place the object to be measured on the weighing pan.

[0102] Step S2: Based on the displacement signal detected by the sensor, adjust the output current of the electromagnetic force generating device and apply an electromagnetic force to keep the balance beam structure at a preset balance position.

[0103] Step S3: Calculate the weight of the object to be measured based on the applied output current value.

[0104] In step S1, it can be understood that according to the measurement requirements, the counterweight system is controlled to apply or remove counterweight loads at both ends of the balance beam structure to expand the measurement range and optimize the measurement accuracy. When measuring small masses, the counterweight load can be removed and the measurement can be directly carried out by the electromagnetic force compensation method. When measuring large masses, the counterweight system is appropriately loaded with counterweights to expand the measurement range upward.

[0105] In step S2, the control module can receive the signal from the sensor, adjust the current according to this signal, control the electromagnetic force generating device to generate an electromagnetic force, and make the balance beam structure return to the preset balance position. Furthermore, by measuring the applied current value, the mass of the object to be measured is calculated through the built-in calculation program of the system.

[0106] The electromagnetic force generating device in this application includes key components such as coils and permanent magnets. The coil is generally wound with a metal wire with good conductivity (such as copper wire) and has a certain number of turns. The permanent 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 balance position. By controlling the magnitude of the current passing through the coil, the magnitude of the generated electromagnetic force can be controlled.

[0107] In one embodiment, further, in the step of controlling the counterweight system to apply or remove counterweight loads at both ends of the balance beam structure in step S1, the measurement range of the mass comparator can be expanded by adjusting the weight of the counterweight load. Specifically, there are the following situations.

[0108] The first situation: To increase the upper limit of the measurement range, when counterweight loads are applied at both ends of the balance beam structure, control the weights of the counterweight loads at both ends to increase monotonically, that is, gradually increase the applied loads, and the upper limit of the measurement range of the mass comparator is increased, which is suitable for measuring large-mass objects. For example, if the original measurement range of the mass comparator is 0g - 100g, by appropriately increasing the counterweight load, such as adding 100g counterweights at both ends of the balance beam at the same time, the upper limit of the measurement range can be expanded to 200g, so as to meet the measurement requirements of large masses.

[0109] Second case: Lower the lower limit of the measurement range. When counterbalancing loads are applied to both ends of the balance beam structure, control the counterbalancing loads at both ends to monotonically decrease, that is, gradually reduce the applied loads. By reducing the counterbalancing loads, the balance beam structure can maintain higher sensitivity within a small mass range, thereby lowering the lower limit of the measurement range.

[0110] Third case: Restore the original range. Completely remove the counterbalancing loads at both ends of the balance beam structure to restore the measurement range of the mass comparator to its original range, that is, the measurement ability of the device itself in the state without counterbalancing adjustment.

[0111] Fourth case: Raise the upper limit of the measurement range. When counterbalancing loads are applied to both ends of the balance beam structure, control the counterbalancing load at the first end of the balance beam structure to monotonically decrease, and control the counterbalancing load at the second end of the balance beam structure to monotonically increase.

[0112] In this case, the counterbalancing load at the first end (i.e., the scale pan side) is reduced, and the counterbalancing load at the second end (reference load side) is increased. It can be understood that, for example, when the mass of the object to be measured is large, if directly relying on electromagnetic force compensation to maintain balance, it may lead to the compensation ability reaching its limit, affecting the measurement accuracy. Therefore, at this time, the load at the first end can be selected to be reduced to lower the additional load at this end, enabling the system to carry a larger object to be measured. At the same time, the load at the second end is increased to raise the reference standard to adapt to a larger measurement range.

[0113] Fifth case: When counterbalancing loads are applied to both ends of the balance beam structure, control the counterbalancing load at the first end of the balance beam structure to monotonically increase, and control the counterbalancing load at the second end of the balance beam structure to monotonically decrease.

[0114] In this case, the counterbalancing load at the first end (i.e., the scale pan side) is increased, and the counterbalancing load at the second end (reference load side) is reduced. Then, similarly, for example, when the mass of the object to be measured is small, since the mass comparator is usually designed for high precision, its original range may not be able to accurately sense small-mass objects. Therefore, increasing the load at the first end raises the initial load at this end, enabling small-mass objects to be amplified to a suitable measurement range; reducing the load at the second end reduces the reference compensation, enabling the system to more sensitively sense small-mass changes.

[0115] In the above measurement method, the third case (removing the balancing load) is actually a special case of the second case (lowering the lower limit of the measurement range). The core difference lies in the degree of reduction of the balancing load, which can ensure weight detection within different mass ranges, improving the comprehensiveness and practicality of the comparator. For the fourth and fifth cases, the upper and lower limits of the measurement range can be dynamically adjusted to make it applicable to a wider range of measurement requirements. Combining with other balancing modes (such as the case of simultaneously increasing / decreasing the balancing load at both ends), a complete measurement range adjustment mechanism is formed, enabling the system of the present application to operate stably in various measurement environments.

[0116] It should be noted that the above embodiments and implementation manners can be freely combined as needed. The above are only the preferred implementation manners of the present application. It should be pointed out that for those of ordinary skill in the art of the present technology, without departing from the principle of the present application, several improvements and refinements can still be made, and these improvements and refinements should also be regarded as the protection scope of the present application.

Claims

1. A balancing system, characterized in that: Used in a mass comparator, the mass comparator has a balancing beam structure, the balancing beam structure has a first end and a second end arranged opposite to each other, the first end is connected to a scale plate of the mass comparator, and the second end is connected to a reference load portion of the mass comparator, the balancing system comprises: a first balancing portion disposed at a first end of the balance beam structure, capable of selectively applying or removing a load to the first end; a second balancing portion, disposed at a second end of the balance beam structure, capable of selectively applying or removing a load to the second end; The first balancing part and the second balancing part can work together to extend the measurement range of the mass comparator by simultaneously applying or removing loads to both ends of the balance beam structure.

2. The balancing system according to claim 1, characterized in that: The balancing system also includes a balancing adjustment module. The first balancing part and the second balancing part are both physical weight modules. The balancing adjustment module is respectively connected to the first balancing part and the second balancing part to control the loading or unloading of the first balancing part and the second balancing part.

3. The balancing system according to claim 2, characterized in that: The number of the balancing and adjusting modules is at least two; Among them, part of the balancing adjustment module is arranged at the first end of the balance beam structure, and cooperates with the first balancing part, for adjusting and controlling the loading and unloading of the first balancing part; the rest of the balancing adjustment module is arranged at the second end of the balance beam structure, and cooperates with the second balancing part, for adjusting and controlling the loading and unloading of the second balancing part.

4. The balancing system according to claim 2 or 3, characterized in that: The balancing and adjusting modules all include a driving device and a control unit. The driving device is used to realize the loading or unloading operation of the first balancing part or the second balancing part relative to the balance beam structure, and the control unit is used to control the action of the driving device.

5. The balancing system according to claim 4, characterized in that: The driving device comprises a translation mechanism; a first beam body butt joint end and a second beam body butt joint end are respectively provided at two ends of the balance beam structure, the first balancing part is provided with a first balancing butt joint end, and the second balancing part is provided with a second balancing butt joint end; Wherein, the first balancing part moves under the driving of the corresponding translation mechanism, so that the first balancing butt end and the first beam body butt end can be connected or separated from each other, which is used for loading or unloading of the first balancing part; The second balancing part moves under the drive of the corresponding translation mechanism, so that the second balancing butt end and the second beam body butt end can be connected or separated from each other for loading or unloading of the second balancing part.

6. The balancing system according to claim 4, characterized in that: The driving device includes any one of an electric driving device, a mechanical driving device, a hydraulic driving device, a pneumatic driving device, and an electromagnetic driving device, or a combination of several of them.

7. The balancing system according to any one of claims 1 to 3, 5 and 6, characterized in that: The balancing system also includes a guide structure, which is arranged on the loading and unloading path of the first balancing part and / or the loading and unloading path of the second balancing part, and is used to prevent the first balancing part and / or the second balancing part from being offset or misaligned during docking.

8. A mass comparator, characterized in that: include; Balance beam structure; A weighing pan connected to the first end of the balance beam structure and used to carry the object to be measured; A sensor, used to detect the displacement or tilt angle of the balance beam structure and generate a corresponding signal; an electromagnetic force generating device, acting on the second end of the balance beam structure, and configured to generate an electromagnetic force according to the signal to keep the balance beam structure at a preset balance position; The balancing system of any one of claims 1 to 7, at least partly disposed on the balancing beam structure, wherein the first balancing portion and the second balancing portion are capable of applying or removing a load to the balancing beam structure; A control module, used for receiving the signal, and adjusting the working state of the balancing system according to the signal, and / or adjusting the magnitude of the electromagnetic force; The display module is used to display the measurement results.

9. A measurement method, characterized in that: The mass comparator according to claim 8 comprises the steps of: Controlling the balancing system to apply or remove balancing loads at both ends of the balance beam structure, and placing an object to be measured on the scale pan; Based on the displacement signal detected by the sensor, the output current of the electromagnetic force generating device is adjusted and the electromagnetic force is applied to keep the balance beam structure at a preset balance position; Based on the applied output current value, the weight of the object to be measured is calculated.

10. The measuring method according to claim 9, characterized in that: The control of the balancing system to apply or remove the balancing load at both ends of the balance beam structure by adjusting the weight of the balancing load to expand the measurement range of the mass comparator specifically includes the following situations: In the first case, when counterbalance loads are applied to both ends of the balance beam structure, the counterbalance loads at both ends are controlled to increase monotonically, and the upper limit of the measurement range is increased, so that the mass comparator is suitable for measuring large mass objects; In the second case, when counterbalance loads are applied to both ends of the balance beam structure, the counterbalance loads at both ends are controlled to decrease monotonically, and the lower limit of the measurement range is reduced, so that the mass comparator is suitable for measuring small mass objects; In the third case, the loads at both ends of the balance beam structure are removed, and the measurement range is consistent with the native range of the mass comparator; In a fourth case, when balancing loads are applied to both ends of the balancing beam structure, the balancing load at the first end of the balancing beam structure is controlled to decrease monotonically, and the balancing load at the second end of the balancing beam structure is controlled to increase monotonically; In a fifth case, when balancing loads are applied to both ends of the balancing beam structure, the balancing load at the first end of the balancing beam structure is controlled to increase monotonically, and the balancing load at the second end of the balancing beam structure is controlled to decrease monotonically.

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